Source: https://patents.google.com/patent/JP2003162993A/en
Timestamp: 2020-04-07 01:14:36
Document Index: 581174752

Matched Legal Cases: ['art 4', 'art 28', 'art 28', 'art 7', 'art 4', 'art 63', 'art 92', 'art 28', 'art 29', 'art 32']

JP2003162993A - Battery interconnecting structure, battery module and battery pack - Google Patents
Battery interconnecting structure, battery module and battery pack
JP2003162993A
JP2003162993A JP2001360930A JP2001360930A JP2003162993A JP 2003162993 A JP2003162993 A JP 2003162993A JP 2001360930 A JP2001360930 A JP 2001360930A JP 2001360930 A JP2001360930 A JP 2001360930A JP 2003162993 A JP2003162993 A JP 2003162993A
JP2001360930A
JP3848565B2 (en
不二夫 平野
2001-11-27 Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
2001-11-27 Priority to JP2001360930A priority Critical patent/JP3848565B2/en
2003-06-06 Publication of JP2003162993A publication Critical patent/JP2003162993A/en
2006-11-22 Publication of JP3848565B2 publication Critical patent/JP3848565B2/en
(57) [Summary] [Problem] A battery connection structure that can reduce the electric resistance while being configured at a low cost by an easy process, and a battery module having a robust configuration that is strong against vibration and shock. Provided is a battery pack having a required configuration by easily connecting individual battery modules. A connection structure between batteries includes a flat connection plate (38).
Are welded and connected to each other in a state of being bridged over one connecting electrode portion 28 of two adjacent unit cells 13 and the bottom surface of the other battery case 14. The battery module 12 has a cylindrical cell 13 in each of the square battery storage portions 31 of the holder case 30 made of synthetic resin.
Are stored in such a manner that their battery axes are parallel to each other, and both sides of the holder case 30 are closed by lid members 53 and 54 having heat radiation holes 57 to 60. The battery pack 100 is attached to the exterior plate 68 in an arrangement in which a plurality of battery modules 12 are combined and integrated.
Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a method for connecting a plurality of cells.
Next, to configure the battery module with the required output voltage
Battery connection structure and the structure using the battery connection structure.
Battery modules to be formed and the battery modules
Several units are electrically connected and mechanically connected.
It relates to a battery pack to be formed. 2. Description of the Related Art Conventionally, a plurality of cells are required to be connected in series.
For configuring a battery module that obtains an output voltage of the battery
Japanese Patent Laid-Open No. 10-106533 discloses an inter-connection structure.
(Hereinafter referred to as a first prior art), Japanese Patent Laid-Open No. 2000-12
No. 6703 (hereinafter referred to as a second prior art) or
Japanese Patent Application Laid-Open No. 2000-149907 (hereinafter, referred to as a third prior art)
Technologies) are known.
You. In the first prior art, as shown in FIG.
A dish-shaped connection placed between two batteries B1 and B2
The body 3 is a metal cap serving as a positive electrode terminal of one battery B1.
1 and the negative electrode end of the other battery B2
To the battery case 2
It is configured to be connected and connected. That is, the connection body 3
Are attached to the cylindrical portion 4 that is fitted to the battery case 2 and the sealing plate 10.
And a flat portion 7 in contact therewith.
9 on the same radius between the inner surface and the lower surface of the flat portion 7
Projection welding at each position at equal intervals of 0 °
Projections 8 and 9 are formed, and
Projection welding, the flatness of the connection body 3
The surface 7 is connected to the metal cap 1 of one battery
It is connected to the sealing plate 10 which is pneumatically connected, and the cylindrical portion 4 is connected to the other end.
The battery B2 is connected to the battery case 2. One battery B
An insulating ring 11 is provided between the battery case 2 and the connector 3
Therefore, an electrical short circuit is prevented. This
When both batteries B1 and B2 are electrically connected in series,
Are mechanically connected to each other. FIG. 16 shows a conventional battery module 5.
Things. This battery module 5 has a required output voltage
Of the number necessary to obtain
The cells B1 to B6 are connected in series by the above-described battery connection structure.
It is configured by connecting. The second prior art is different from the first prior art.
It has almost the same configuration as the first prior art.
The difference is that the plate is almost the same as the first prior art connector 3.
Connection part (flat part) and flange part (circle)
Each of the cylindrical portions has a press-contact convex portion, and the press-contact convex portion is provided through the press-contact convex portion.
And weld the dish-shaped connector to two cells by laser welding
This is the only configuration. [0006] The third prior art is based on the first and second techniques.
Direct connection between multiple batteries without using connectors as in the prior art
It is connected directly. That is, opening the battery case
The connection body that protrudes outward from the battery axis is
Forming a pole portion and connecting one of the two adjacent cells.
The connecting electrode is connected to the projection electrodes
With the opening of the battery case of the other cell via the contact protrusion
Is directly connected to the opposite bottom by projection welding.
Connect multiple cells in a row in the direction of each battery axis
They are connected in series in an arrangement. The first to third prior art battery indirect devices
The battery module configured using any one of the connection structures
A power supply that can take out high-voltage power by electrically connecting many
It is composed of a pond pack. Battery to obtain such high voltage power
The pack includes, for example, an internal combustion engine and a battery-driven motor.
Hybrid type electric vehicle used as a driving source
Of the above motor. This type of service
A conventional battery pack is disclosed in Japanese Patent Application Laid-Open No. 10-270006.
Official Gazette (hereinafter, referred to as a fourth conventional technique)
Patent Publication No. 0-223096 (hereinafter referred to as a fifth conventional technique).
) Are known. The battery pack according to the fourth prior art is
A rectangular box-shaped plastic holder with an open top
Battery case 5 as shown in FIG.
Are arranged in a plurality of rows and in multiple stages and are built-in. E
The rudder case has a slender cylindrical outer shape.
Circular through holes for inserting the pond module 5
And the same number of battery modules as
In addition, there are two intermediate walls to keep the battery module stable.
It is provided between the end walls in parallel with these, and on this intermediate wall
Also, circular through holes are opened by the same number as both single walls. Electric
Pond modules are inserted into each through hole in both end walls and the intermediate wall.
It is held in place in the holder case. Further, the battery pack according to the fifth prior art described above.
Holds multiple battery modules inside in a parallel arrangement
Equipped with a holder case,
Between the lid case and the two lid cases
And an intermediate case. Furthermore, holder case
The battery on both sides of the middle case and the inside of the lid case.
Holder for holding modules in multiple rows and multiple rows
Darribs are protruding, and lid cases on both sides
Connect with the intermediate case, and use the holder ribs in multiple rows and multiple stages
The battery module from both sides and hold it in place
I have. SUMMARY OF THE INVENTION
An electric power source configured using the inter-battery connection structure according to the prior art
The pond module 5 includes a plurality of unit cells B1 to B6.
Of a slender columnar shape connected side by side in the battery axis direction
Therefore, the overall outer diameter, length and parallelism can be adjusted with high accuracy.
Extremely difficult to manufacture. Also projection
Welding is for projection welding of cylindrical part 4 of connector 3
Unstable with the projection 8 contacting the outer surface of the circular battery case 2
5 lowers the yield. Besides, the welding frequency is
One between each two adjacent cells B1 to B6
When connecting with the connection body 3, the space between the battery case 2 and the connection body 3
4 times with series welding method, and between the connector 3 and the sealing plate 10
The series welding method requires two times, and this
Productivity is poor with the number of people. Also, each two adjacent
The path between the cells B1 to B6 passes through the path through the connection body 3.
Current flows, the current path becomes longer,
The electrical resistance increases by just that much. Further, the connecting body 3 and the insulating ring 11
It is to be installed every two adjacent cells B1 to B6
As a result, the cost of parts increases,
Since the mounting process of the edge ring 11 is required, productivity is low.
Further decrease. In addition, this battery module
Used in a vibrating environment such as an electric bicycle
However, in the connection structure of the cells B1 to B6,
Low bending strength between batteries B1 and B2 and mechanical connection
Insufficient strength to connect when subjected to severe vibration
The continuation body 3 is broken and the connection between the cells B1 and B2 is easily disconnected.
There are drawbacks. A second prior art inter-battery connection structure.
The battery module constructed using the first conventional technology
Since it has almost the same configuration as
Diameter, length and parallelism with extremely high precision
Difficult to perform, and performing laser welding in an unstable condition.
As the yield is low and the number of weldings is large,
Low productivity, requiring connections and insulating rings.
Therefore, parts cost increases and man-hours increase
When the productivity is further reduced and severe vibration is applied
As in the first prior art, in which the connection body is easily broken.
There are points. Moreover, in this battery module,
And have a large thickness so that it does not break even when
When using a non-sealable material, stress is applied to the sealing
The airtightness of the mouth may be impaired. Further, a third prior art connection between batteries.
The battery module configured using the structure includes first and second battery modules.
Connection and disconnection compared to the prior art battery module 2
No need for edge rings and fewer weldings
Thus, there is an advantage that the cost can be reduced. On the other hand,
For the pond module, connect the cells by direct welding.
Machines that are inevitably subjected to vibration or side impact
Mechanical strength and bending strength of the first and second prior art
Since it is even lower compared to electric vehicles and electric bicycles
When used in an environment subject to severe vibration,
In a very sturdy holding form in the holder case.
If such a configuration is used,
High. On the other hand, the conventional battery pack does not have the first
Then, any of the battery modules according to the third prior art is required.
Although it is configured by connecting and connecting the same number, the fourth
In battery packs according to the conventional technology, both end walls and intermediate walls
The mold for the holder case with through holes has the above shape
Because it cannot be easily removed from the part that forms
Complicated structure makes it difficult to manufacture holder cases
Therefore, the manufacturing cost is high. Also, the battery module
Connecting body 3 and insulating ring 11 at the connection between batteries
Projecting out of the battery case 2 and
And the outer diameter is not constant,
Even if each through hole in the intermediate wall is formed with high precision,
Insert and hold the battery module in the through hole without any gap.
Battery module is stable without rattling
Can not be held. Moreover, small penetration of the battery module
The work of inserting and mounting in the hole is very time-consuming
And productivity is poor. In addition, the number of stored battery modules
If the holder is changed, replace the holder case with a new
Since it is necessary to manufacture in a mold, even higher cost and
Become. [0015] In a fifth conventional battery pack,
Is the lid case and intermediate case that constitute the holder case.
If any deformation such as warpage occurs,
It is difficult to keep the battery modules evenly. So
Here, the lid case and intermediate case may
And the shape of the holder rib and the holder
It is required to manufacture the dimensions between the ribs with high precision
Therefore, material costs and manufacturing costs are high. Accordingly, the present invention has been made in view of the above-mentioned conventional problems.
It is a simple and inexpensive construction process.
Connection structure between batteries to reduce electrical resistance, vibration and shock
A battery module with a robust configuration that is strong against
Easily connect multiple battery modules to achieve the required configuration
With the purpose of providing a battery pack that can
is there. [0017] In order to achieve the above object,
In addition, the connection structure between batteries according to the present invention also serves as one electrode.
A bottomed cylindrical battery case, and an opening of the battery case.
On the other hand, a sealing body that closes in an electrically insulated state and doubles as the other electrode
And a battery near the outer periphery of the sealing body.
A ring-shaped connection electrode part protruding outward in the axial direction is formed.
A plurality of cells, each of which has a cell axis
Parallel connection plates are arranged side by side, and
The connection electrode portion of one of the two cells
Bridge over the bottom of the battery case of the other cell
Placed in a state, the connection electrode portion and the battery case
Connected by welding to each point close to each other with the bottom part
It is characterized by being. In this inter-battery connection structure, a simple flat plate
Arrange both sides of a certain connection plate so that each battery axis is parallel
Of one of the two cells arranged side by side
And the bottom of the battery case of the other unit cell.
It can be welded in a stable position supported by being bridged over,
There is no danger of defects such as poor bonding, and yield
Is greatly improved. In addition, between the connection plate and the connection electrode
And the connection plate and the bottom of the battery case
It is sufficient to perform welding twice in total, and the number of weldings is large
And the productivity is greatly improved. In addition, the cell
By juxtaposing these battery axes in parallel
The current path between the two cells is
Ring-shaped connection electrode part and the outer periphery of the bottom surface of the other cell
Is the shortest distance between the adjacent points
Air resistance can be greatly reduced. In the battery connection structure of the invention, the battery
A concave part is formed at the center of the bottom of the case, which is recessed inward.
One side of the connection plate is attached to the bottom of the battery case.
Welding to the outer part of the concave part near the unit cell
It is preferable to adopt the configuration described above. According to this structure, the concave portion is formed.
Therefore, a slight gap between the bottom of the battery case and the negative electrode current collector
Since a gap can be provided, the bottom of the battery case
For example, when welding to the connection plate by projection welding
Even if the part is deformed to bulge inward due to heat,
The deformed bottom surface is used to collect the negative electrode due to the existence of the gap.
No adverse effects on body or electrodes
Battery capacity and stable battery function
You. Further, in the battery connection structure of the present invention,
The connection plate is made of a three-layer clad material of Ni-Cu-Ni.
It is preferable that it is formed in a flat plate shape. This
The connection plate ensures good conductivity with the central Cu layer.
While keeping the Ni layers on both sides
Can be suitably welded to nickel-plated steel sheet
In this way, the electrical resistance can be further reduced and the power loss
It can be kept small. Further, in the battery connection structure of the present invention,
Two adjacent cells are close to each other with a small gap
A pair of connection plates of the same shape arranged as
In this state, both sides are welded to each other,
It may be configured to be electrically connected through the connecting plate
it can. According to this configuration, the pair of connecting plates may be replaced, for example.
Even if it is a simple shape with a notch, this pair of connections
Welding between both connecting plates by arranging the plates close to each other
Sometimes it is possible to form the same shape as the necessary holes and slits
Can be mass-produced at low cost
You. Moreover, for example, the connection plate is projected to two batteries.
When welding by welding,
There is a great advantage that can be completely eliminated. Further, in the battery connection structure of the present invention,
In this case, the connection plate is connected to each contact point between two adjacent cells.
Squeezing at least at places close to each other
Is formed, and the thin portion of the drawing is a laser
Welded or beam welded to the two cells
Configuration. According to this configuration, between two adjacent cells.
Electrical resistance is greatly reduced by minimizing the current path distance
In addition to cutting, the thin part of the aperture is irradiated with a light beam and
By performing welding or beam welding, sufficient welding strength
The battery module according to the present invention, which can ensure the degree of welding and improves the reliability of welding,
It has an almost rectangular parallelepiped shape with a thickness almost equal to the length, and is cylindrical
Square with one side approximately equal to the outer diameter of the cell
A plurality of battery compartments penetrating in the thickness direction with a shape of
One or more rows of synthetic resin holders
Having a base and individually inserted into each of the battery housings.
Each two adjacent cells of each cell are each
Electrical connection by any of the battery connection structures
Connected and mechanically connected to the holder case.
The openings on both sides in the thickness direction are covered by lid members
Each cell is closed, and the lid and
A gap between the partition wall of the pond storage unit and the connection plate and the partition wall;
Corresponding to each of the above gaps at locations corresponding to the gaps between
It is characterized by having a heat dissipation hole of
I have. In this battery module, a synthetic resin
External dimensions are uniquely determined by the molding accuracy of the rudder case
After the assembly process
There is no distortion and the shape is highly accurate. Also,
Each cell is housed in an individual battery compartment.
Is kept completely electrically insulated
Ring and resin outer tube
Eliminates the need for components such as
The above can be aimed at. In addition, each cell is
Four locations on the outer peripheral surface are in contact with the four partition walls forming the battery housing.
Because it is fixed with the lid member while touching it,
It is securely held without rattling even in the case of shaking. Also, each
Voids and contacts between the cells and the partition in the battery compartment
The gap between the continuation plate and the partition wall of the battery
Connected to the outside of the holder case through the heat dissipation hole of the member
Each cell from one side of the holder case.
The heat radiation passage that passes through the periphery of
Each cell is formed by wind flowing through the heat dissipation passage.
Very effective cooling, and a relatively large number
All the cells can be cooled uniformly. In the battery module of the present invention,
Each connection plate and each lid on both sides in the thickness direction of the case
Between each cell and the partition of the battery compartment
And a gap between the connection plate and the partition wall.
At the corresponding locations, heat radiation holes of a shape corresponding to
Elastic sheet with notches for heat dissipation
It is preferable to use the existing configuration. According to this configuration, the heat radiation of the elastic sheet is performed.
The holder case of each cell is
While securing a heat dissipation path to the outside of the holder,
-Shock and vibration applied from the outside of the case can be
In particular, because it is absorbed and does not act directly on each cell,
Severe vibration of cars, electric bicycles, electric tools, etc.
When used in an environment where shock or impact is likely to be applied
However, it is possible to securely maintain each cell in a protected state.
it can. Further, in the battery module of the present invention,
The battery compartment of the holder case has a square shape in plan view.
Instead, the first two opposing sides substantially correspond to the outer diameter of the cell.
Equal and the other opposing second two sides are greater than the first two sides
Is also formed in a large rectangular shape in plan view, and the second 2
On the inner surface of each side, the distance between each tip is
A pair of support ribs set to be approximately equal to the outer diameter
Each can be configured to be protruded. According to this configuration, the length is equal to the protruding length of the support rib.
The volume of the gap between the unit cell and the partition of the battery
As the volume of the gap between the connection plate and the partition wall increases,
This increases the amount of air flowing through the air gap, so
Air cooling can be performed effectively. Further, in the battery module of the present invention,
The holder case is located at one end of the battery
Or positive and negative terminals for external connection at both ends
However, connecting members are inserted on both sides in the arrangement direction.
The positive terminal and the negative terminal
The pole terminals and the cells adjacent to them are connected to the connection plate.
It is preferable to use a more connected configuration. According to this structure, the arrangement of the positive and negative terminals
The connecting member is inserted into the holder case by insert molding.
Since it is provided on the body,
Standing man-hour is reduced. It also has a substantially rectangular parallelepiped outer diameter
Connecting member insert-molded outside the holder case
, So simply replace the required number of cells
What is a conventional battery module that is simply connected in series in the axial direction?
Differently, connect the positive and negative terminals to the specified electrode terminals.
And fix it to the mounting part of the equipment etc. via the connecting member.
As a result, it can be used as a drive power source for various devices
It is also possible to use. The battery pack of the present invention comprises the above-mentioned positive electrode terminal and
In the battery module of the present invention provided with
Thickness on both sides with respect to the installation direction
A connecting member is provided at one end in the direction, and the other end in the thickness direction.
The mounting members are provided by insert molding, respectively.
One of the two battery modules is thicker than the other.
When they are superimposed in an inverted orientation
In both cases, both battery modules fix each connecting member
Battery module unit that is integrated by connecting members
A plurality of the battery module units.
Are placed side by side with multiple exterior plates
The periphery is covered, and the mounting member is attached to the outer case.
Each of the battery modules is fixedly integrated with a fixing member and integrated.
The positive and negative terminals for external connection of each
Connected to each battery module.
Each built-in unit cell is connected in series,
are doing. In this battery pack, the battery module is
Extremely high, uniquely determined by the molding accuracy of the rudder case
Holds an accurate external shape and a relatively large number of cells
ー Being stably stored and held in the case,
Battery modules with fixing members such as fixing screws
The battery module unit is easily connected by simple fixing means.
Can be configured as well as multiple battery modules.
Control unit is mounted around the exterior
With a simple fixing means using fixing members such as fixing screws.
Easy integration, yet easy to assemble into a very robust structure
Can stand. Therefore, this battery pack is extremely expensive
It can be manufactured with productivity. Also, battery module
Has a block configuration that stably holds many cells
When changing the number of battery modules
The shape of the exterior plate that can be formed by bending the plate material
Compared to molding the holder case with a mold, it is extremely
Inexpensive. In addition, the battery module unit
Between two superposed battery modules
Also, whether the heat dissipation passage of each battery module is communicated
However, even when multiple battery modules are integrated,
The cooling function of the cell
A cooling mechanism such as a cooling fin blade becomes unnecessary. In the battery pack of the present invention, the battery module
Module in the two battery modules
The two battery modules are attached to the lid members
Multiple support leg projections extending outward in the stacking direction
Each of the battery modules is provided so as to protrude, and
The tip of the supporting leg projection of each unit abuts
Insertion recess to be stored in a relative position, and the side of the insertion recess
The mounting member of the battery module unit is provided in
A mounting surface connected in a contact state;
A large number of ventilation holes are provided in the connection plate that connects the cases to each other.
Is preferably formed. According to this configuration, the support leg projection is formed in the insertion recess.
The holder case and exterior play
And an effective heat dissipation passage can be formed between
Since this heat dissipation passage communicates with many ventilation holes,
Air cooling several cells very efficiently and all equally
Temperature can be controlled by the temperature
Sensors and blowers are no longer required, resulting in considerable cost reduction
While achieving the required cooling effect.
Can also reduce the overall shape. Preferred embodiments of the present invention will be described below.
The state will be described with reference to the drawings. FIG. 1 shows the present invention.
Of the components of the battery module 12 according to one embodiment
It is an exploded perspective view showing arrangement. In this embodiment,
20 cylindrical cells 13 of the same type and standard
The case where a column connection is illustrated is illustrated.
An example is a nickel-metal hydride secondary battery. First, the present invention is applied to the battery module 12.
The configuration of the cell 13 will be described. FIG.
A perspective view showing the pond 13, (b) is a sectional view taken along line AA of (a).
It is. One end of the battery case 14 serving as the negative electrode is opened.
This battery case 1 has a cylindrical shape with a closed bottom.
4, a well-known positive electrode plate and a well-known negative electrode plate are interposed between them.
Electrode group 17 formed in a spiral shape with a
And an electrolyte (not shown). Also, the battery case
The opening of the base 14 is the sealing plate 19, the insulating gasket 2
0, a metal cap 21 and a rubber valve 22
It is closed by the closed sealing body 18. That is, the sealing plate 19 has a peripheral portion.
To the battery case 14 via the insulating gasket 20.
The battery case 14 which is gas-insulated and crimped
It is fixed to the opening via an insulating gasket 20,
Thereby, the opening of the battery case 14 is closed.
You. The sealing plate 19 protrudes outward in the battery axial direction.
Ring-shaped connection electrode portion 28
It is formed in a heart-shaped arrangement. Pulled out from electrode group 17
The positive electrode lead 26 is connected to the sealing plate 19. And
Accordingly, the connection electrode portion 28 formed on the sealing plate 19 is formed.
Is a positive terminal. The battery case 14 serving as a negative electrode
In the center of the bottom of
It is formed in a concentric arrangement. The rubber valve body 22 is provided at the center of the sealing plate 19 with a concave portion.
In the space formed between the place 23 and the metal cap 21
The gas exhaust hole 24 which is stored and is drilled in the recess 23 is closed.
I'm blocking. The rubber valve body 22 is connected to the gas pressure inside the battery.
Gas rises abnormally and reaches the valve opening pressure.
It is elastically deformed by the gas pressure acting through
Open the drain hole 24. As a result, the gas inside the battery
Is the gas discharge of the gas discharge hole 24 and the metal cap 21.
It is discharged out of the battery through the hole 27. Each of the cells 13 is a holder made of synthetic resin.
It is stored in the case 30. Holder case 30 is simply
The battery 13 has substantially the same thickness as the length in the battery axial direction.
It has the shape of a rectangular parallelepiped and contains 20 cells 13 inside it.
10 battery storage units 31 for individual storage are arranged in two rows.
Is established. Each battery compartment 31 is surrounded by four partition walls
With a square shape in plan view and in the thickness direction.
Penetrates. Therefore, how to penetrate each battery housing 31
The direction length is set to be the same as the length of the cell 13 in the battery axis direction.
Have been. The shape of the battery storage section 31 is a plan view.
One side of the square is set substantially equal to the outer diameter of the cell 13.
Have been. Each battery storage section in the holder case 30
Outer surface of one end side (left end in the figure) in the arrangement direction (longitudinal direction) of 31
Has a positive terminal 32 for external connection composed of a nut and an external
The negative electrode terminal 33 for connection is integrally provided by insert molding.
Have been killed. In addition, the above arrangement of the holder case 30
A connecting member 34 made of a nut is provided on both outer surfaces along the direction.
Are two on the top side in the thickness direction (the top side in the figure)
It is arranged and provided integrally by insert molding
And three mounting members 37 each consisting of a nut.
Are arranged on the lower side in the thickness direction (lower side in the figure).
It is provided integrally by sert molding. Each of the cells 13 has a holder case.
30 are inserted into the battery compartment 31 so that each battery shaft is
In the front row and the
And the two adjacent ones in the rear row are
The connection plate 38 and the connection plate 38 on the lower side alternately
Next, they are connected and connected in series. However, the rear row in the figure
The cell 13 at the left end has a bottom portion of its own battery case 14.
Connected to the external connection positive terminal 32 via the connection plate 38.
The cell 13 at the left end of the front row is connected to its own connection electrode part 28.
Is connected to the external connection negative terminal 33 through the connection plate 38.
It is. Also, the right end of each connection plate 38 on the upper surface side in FIG.
, The connecting plate 38 located at
The two unit cells adjacent at the right end of each of the rear row side and the front row side
The batteries 13 are connected to each other. FIG. 4 is adjacent by the connection plate 38.
One of the present invention in which two cells 13 are connected respectively.
1A shows a connection structure between batteries according to an embodiment, and FIG.
Figure, (b) is a front view, (c) is cut along line BB of (a)
FIG. The connection plate 38 is clearly shown in FIG.
As shown, the four corners are almost round
It is a rectangular flat plate and has a three-layer Ni-Cu-Ni cladding.
Is formed by a pad material,
A through hole 39 is formed on the side and extends in a longitudinal direction from the through hole 39.
From the opposite sides in the radial direction along
A gate 40 is formed. Further, 4
Projection projections 42 (projections 4 in FIG. 4).
2 formed after performing projection welding through
Nugget 41 is shown on the same circle outside the through hole 39
Are formed beforehand at 90 ° equidistant positions.
Therefore, the connecting plate 38 is lined with respect to the central portion in the longitudinal direction.
It has a symmetrical shape, and in this embodiment,
The connection plate 38 is projection-welded through the projection 42.
Is illustrated. In the above inter-battery connection structure, two adjacent two
When the connection plate 38 is placed in a state of being bridged between the cells 13
At this time, the four professionals on one side (left side in FIG. 4) of the connection plate 38
The projection 42 for injection welding is a connection electrode part of the cell 13.
4 and the four protrusions on the other side (the right side in FIG. 4)
Reference numeral 42 denotes a portion around the concave portion 29 on the bottom portion of the unit cell 13.
And the well-known projection welding is performed in this state.
Be done. This projection welding is a simple flat plate
Both ends of a certain connection plate 38 have their battery axes parallel to each other.
One cell 1 of the two cells arranged side by side in the arrangement
3 and the power supply of the other unit cell 13
A stable figure that is supported over the bottom of the pond case 14
As the conventional battery connection structure described above.
Defects such as poor connection due to welding in unstable postures
There is no danger of occurrence, and the yield is greatly improved. In the case of projection welding,
In the unit cell 13 on the left side of FIG.
The electrode is brought into contact with the side surface of the connection electrode portion 28, and
The pole is brought into contact with the portion of the connection plate 38 facing the protrusion 42.
And apply a higher voltage than the inverter DC power supply between both welding electrodes.
Add. As a result, the welding current has a small contact area.
From the projection 42 and the connection electrode portion 2 having extremely small contact resistance.
8 and flows locally in a concentrated manner,
As a result, the four projections 42 are melted, and the connection plate 38 and the connection electrode portion are melted.
28 and nugget 41 in a state where they are securely adhered to each other.
Is welded on. Therefore, the connection plate 38 and the connection electrode portion 2
8 means 4 nuggets by one projection welding
It can be firmly joined through the socket 41. In the right cell 13 in FIG.
Also, the negative side welding electrode is brought into contact with the outer peripheral surface of the battery case 14.
And the positive side welding electrode is
Contact the opposite part, and connect the inverter DC between both welding electrodes.
By applying a higher voltage than the power supply, the connection plate 38
One projection welding with the bottom of the pond case 14
Can be firmly joined via four nuggets 41
You. Therefore, each of two adjacent cells 13
Can be connected to each other by two projection weldings
For example, the conventional inter-battery connection structure shown in FIG.
Compared to repeating the welding process a total of eight times,
In the embodiment, the 20 cells 13 are welded to each other.
Because it is connected, the number of weldings can be greatly reduced,
As a result, productivity is significantly improved. Also, the above professional
At the time of the injection welding, the through hole 39 and the pair of slits are used.
The use of 40 makes it possible to significantly reduce the ineffective branch flow. Further, in the above inter-battery connection structure,
Ring-shaped connection electrode part 28 of cell 13 and the other cell
13 near the outer peripheral portion of the recess 29 of the thirteen.
Since both ends of the connection plate 38 are welded at the place, FIG.
The current path between two adjacent cells 13 shown in FIG.
By setting the distance L to be the shortest, the electric resistance can be greatly reduced. this
On the other hand, in the conventional battery connection structure shown in FIG.
The longest distance between the flat part 7 and the cylindrical part 4 in the connection body 3
Is connected to two adjacent cells B1 and B2.
As a result, the distance of the current path between the two cells B1 and B2 becomes longer.
And the electrical resistance increases. Moreover, the connection plate 38 has a three-layer structure.
Since it is formed of a clad material,
While ensuring good conductivity by the layer, Ni on both sides
The layer is made of nickel, which is a common material for the battery case 14.
Suitable for welding to steel sheets
Resistance can be further reduced. Therefore, the above connection structure between batteries
Can minimize the power loss at the connection plate 38
You. Further, in the above connection structure between batteries, the rubber valve
22 and side to and above metal cap 21 holding
Of the ring-shaped connection electrode portion 28 projecting away from the
On the outer side surface and the portion of the connection plate 38 facing the projection 42, respectively.
Projection welding by contacting the welding electrodes
Therefore, no current flows through the metal cap 21 and the metal cap 21
The rubber valve body 22 is deformed by the heat effect of the cap 21.
There is no danger. This allows the battery connection structure
Can always ensure the required valve operation of the rubber valve body 22
it can. On the other hand, in the conventional structure of FIG.
Welded to the opposite part of the protrusion 9 and the metal cap 1
If projection welding is not performed by contacting the electrodes
The metal cap 1 through which current flows is affected by heat
The rubber valve 22 was deformed by being recessed inward. Further, in the above connection structure between batteries,
13 is provided with a concave portion 29 recessed inward on the bottom surface.
A small gap b is provided between the battery case 14 and the bottom surface.
It is possible to connect the bottom of the battery case 14 and the connection plate 3
8 is projection-welded when
Even if it is deformed to bulge inward due to the influence,
The shape of the bottom surface is bad for the negative electrode current collector 43 and the electrode group 17.
Has no effect. Therefore, the connection structure between batteries
The required battery capacity and stable battery function.
Can be In contrast, the conventional battery connection structure,
The cell is connected via a connecting body as in the third prior art described above.
In a direct connection structure, the anode current collector and electrode group
The bottom of the battery case that protrudes inward during projection welding
It was deformed under pressure from the surface. The above connection structure between batteries includes the battery module 1
In the manufacturing process of 2, the individual
Adjacent one of the cells 13 inserted into the pond storage 31
Each of the two is connected by a connection plate 38.
FIG. 5 is a view showing a process of manufacturing the battery module 12.
A single cell inserted into the battery compartment 31 of the rudder case 30
13 is a plan view of a part of the state in which 13 is connected by a connection plate 38. FIG.
It is a thing. At this time, each cell 13 has a conventional structure.
Objects protruding to the side, such as connectors or insulating rings
Inserting the battery into the battery compartment 31 without attaching
And the length of one side of the flat square battery storage unit 31 is
The outer diameter of the battery case 14 of the pond 13
By this, the unit cells 13 are arranged at equal intervals of 90 °.
The location contacts the four partition walls forming the battery housing 31
To ensure that there is no backlash in the event of vibration or shock.
Be held. Further, the single battery inserted into the battery housing 31
When the pond 13 is connected by the connection plate 38, the holder case
On the upper and lower sides of the switch 30 by horizontal parallel lines in FIG.
Between the unit cell 13 and the partition of the battery housing 31 so that
A gap 44 having a substantially triangular cross section is formed in
A long narrow space 47 is formed between the pond storage section 31 and the partition wall.
Occurs. These gaps 44 and 47 are formed in the battery module 1.
2 functions as an effective heat radiation space for the cell 13.
You. Next, returning to FIG.
The explanation of 2 is continued. A single battery 13 is placed in each battery housing 31.
The inserted and adjacent two cells 13 are connected to the connection plate 3.
After the connection is made at step 8 to form the battery connection structure,
Openings on the upper and lower sides of the holder case 30
Upper and lower parts formed by an elastic body such as rubber
Part elastic sheets 48 and 49 are applied respectively. This
Both elastic sheets 48 and 49 have substantially the same band shape.
Therefore, each of the elastic sheets 48 and 49 has a substantially rhombic shape.
The heat dissipation hole 50 and the long and narrow rectangular heat dissipation hole 51 are wide
Are alternately drilled along the longitudinal direction at the center of the
Heat dissipation notches 52 are formed on both sides and both sides
Have been. Further, the upper elastic sheet 48 has
In addition to the heat radiating holes 50 and 51 of FIG.
A rectangular heat radiation hole 46 is formed. The upper and lower elastic sheets 48, 49
The diamond-shaped heat dissipation hole 50 in FIG.
And four gaps 44 generated between the battery housing 31 and
The heat dissipation hole 51 has an elongated rectangular shape.
The gap 4 generated between the connection plate 38 and the battery housing 31 described above.
7 is a shape capable of containing four, and the notch 52 for heat radiation is
Void generated between the above-described unit cell 13 and the battery storage unit 31
44 can be included. In addition, the upper elastic body
Triangular heat-dissipating hole 46 at the right end of FIG.
Is a connection bridged over the cells 13 in the front row and the rear row.
Void generated between continuation plate 38 and partition wall of battery storage unit 31
(Not shown). The upper and lower sides of the holder case 30
The upper opening 53 and the lower lid 5 made of synthetic resin
4 is applied with the elastic sheets 48 and 49 interposed therebetween.
With the upper cover 53 and the lower cover 54
Sealed by ultrasonic welding to the periphery of the opening
Is stopped. The upper lid 53 is provided with each release of the upper elastic sheet 48.
Compatible with heat holes 50, 51, 46 and heat sink notch 52
Corresponding to the shape of the heat radiation holes 57, 5
8, 59, 60 are formed and on both sides
Corresponding to each connecting member 34 of the holder case 30
An escape notch 61 is formed at the position. On the other hand, the lower elastic sheet 4
9 for the heat radiation holes 50, 51 and the heat radiation notch 52.
In the corresponding position, the heat dissipation holes 5 of the corresponding shape
7, 58, 60 are formed and on both sides
The notch 61 for escape is formed in the
Corresponding to each mounting member 37 of the holder case 30
An escape notch 62 is formed at the position. Also this
On the outer surface of the lower lid 54, the lower lid 54 is turned upside down.
As shown in FIG. 2 which is a perspective view of the state,
The part 63 is integrally protruded. Next, an assembling operation of the battery module 12 will be described.
The order will be described. Each component is arranged as shown in FIG.
Battery holders of the holder case 30
The battery cells 13 are inserted into the battery pack 31 in the arrangement shown in FIG.
You. Next, on the upper surface side of the holder case 30,
A connecting plate 38 is bridged between each two cells 13 in contact with each other.
By welding, the above-described battery connection structure is formed.
Then, the two adjacent cells 13 are connected to each other. This
At this time, the two cells 13 at the left end of the drawing are also connected to the connection plate 38.
The positive terminal 32 for external connection and the negative terminal for external connection
33. Subsequently, the upper elastic sheet 48 is melted.
It is placed on each of the connected connecting plates 38, and the upper
The upper lid 53 is placed on the body sheet 48, and the upper lid 53
Between the peripheral edge of the opening and the peripheral edge of the opening of the holder case 30.
The upper end opening of the holder case 30 is sealed by welding. Next, an eave in which the upper end opening is covered with the upper lid 53 is shown.
Turn the rudder case 30 upside down, and
To connect and weld the connecting plate 38 between the cells 13
By forming the above-described inter-battery connection structure,
The two cells 13 are connected to each other. As a result, 20
Cells 13 are electrically connected to each other in series, and
Fixed in holder case 30 with mechanical connection
Is done. Subsequently, the lower elastic body sheet 49 is
It is placed on each connecting plate 38, and its lower elastic body
The lower lid 54 is placed on the upper cover 49, and the peripheral end of the lower lid 54
And the peripheral edge of the opening of the holder case 30 by ultrasonic welding.
When the lower end opening of the holder case 30 is sealed,
Is completed. The upper lid 53, the lower lid 54 and the holder
As means for attaching to the case 30,
Instead of using sonic welding, for example, a fixing screw may be used. The battery module 12 has an inter-battery connection structure.
In addition to obtaining the effects described in connection with FIG.
As shown in the figure, a plurality of cells B1 to B6 are
Unstable conventional battery modules connected in a line
Unlike the above, each cell 13 has its cell axis parallel.
Arranged in the individual battery compartments 31 of the holder case 30
Each cell 13 is stored in the battery storage section 31
In contact with the four sides of the partition and held without play
That both the cells 13 are stored and
The elastic sheets 48 and 49 applied to the end portions
Impact and vibration applied from outside the holder case 30
Is absorbed and does not directly act on each cell 13;
Openings on both sides of the rudder case 30 are
Is completely sealed by welding,
While storing a relatively large number of unit cells 13, each unit cell
Has an electric vehicle or an electric bicycle for the battery module 12.
Or environments where harsh vibrations and shocks such as power tools are likely to be applied
Even when mounted below, ensure that it is protected
It is retained and there is no risk of destruction. Further, the square of the battery storage section 31 having a square shape in plan view
Gap 4 formed between each corner and cell 13
4, 47 are upper and lower elastic sheets 48, 49, respectively.
Heat radiation holes 50, 51, 46 and heat radiation notch 52;
Through the upper and lower lids 53 and 54 through the heat radiation holes 57-60.
It communicates with the outside on both lower sides. This allows
From each side of the holder case 30,
A heat-dissipating passage that passes through the periphery and penetrates to the other side
Therefore, each cell 13 flows through the heat dissipation passage.
Very effectively cooled by the wind
Can be uniformly cooled. And
Therefore, it is configured by using a large number of the battery modules 12.
Battery packs are not provided with conventional battery packs.
This eliminates the need for a cooling mechanism such as a cooling fin blade. This
The details of this battery pack will be described later. Further, in the battery module 12,
The cell 13 is surrounded by partition walls on four sides of the individual battery storage portions 31
The battery is completely stored between the cells 13 so that
It is kept in a gas-insulated state.
For insulation between the cells B1 to B6
Insulated ring 11 and cells B connected in series
Electrical insulation such as vinyl chloride covering the outer peripheral surface of 1 to B6
Resin outer tube with edge and thermal shrink properties
Is unnecessary, reducing material costs and improving productivity.
Can be achieved. In the conventional battery module, the battery shaft
Connected to the side of each cell B1-B6 connected in series in the direction
3 and the insulating ring 11 protrude,
It is difficult to produce high accuracy and parallelism
On the other hand, in the battery module 12, a housing made of synthetic resin is used.
The outer dimensions are uniquely determined by the molding accuracy of the
After being determined and undergoing the assembly process, dimensional variations
There is no occurrence and the shape is highly accurate. The battery module 12 is provided as described above.
A relatively large number (20 in the embodiment) of the cells 13
Is enclosed in the holder case 30 and held in a robust structure
As well as outside the holder case 30
Connection member 34 and attachment part consisting of nuts formed by support
Since the material 37 is integrally provided, six unit cells B
1 to B6 are simply connected in series in the battery axis direction.
Unlike battery modules, electric bicycles and electric
It can also be used as a drive power source for a moving tool or the like.
In particular, the battery module 12 is a motor for an electric vehicle.
Many of these are used for the purpose of driving power supply, etc.
When connected to form a battery pack, a more pronounced effect is obtained.
It is something that can be done. Next, the battery module 12
The battery pack configured using the battery pack will be described. FIG. 7 shows a case where six battery modules 12 are used.
And a battery pack for connecting a total of 120 cells 13 in series.
It is an exploded perspective view showing arrangement of a process of manufacturing a hook. This
Battery pack has three battery modules 12 arranged in parallel.
And placed side by side in close proximity to each other, each of these three
On the upper surface of each of the battery modules 12, three other battery modules
Joules 12 are superimposed in an inverted position
Let At this time, between the upper and lower two battery modules 12
Are abutted against each other in an inverted arrangement,
A total of four connecting members 34, two on each side, are provided on each side.
Oppose in close proximity to each other. Twelve pairs facing each other
A fixing screw 65 is screwed into each of the connecting members 34.
The modules 12 are connected to each other in a superposed state.
Three sets of pond module units 64 are completed. In the battery module unit 64,
The upper and lower two battery modules 12 are in contact with each other.
Radiating holes 57 to 60 of the upper lid 53 and the lower lid 54
Communicate with each other. This allows each battery module
Two upper and lower battery modules in the rule unit 64
12 between the individual cells 13 on one side
Is formed on the other side, so that
In a state where each two battery modules 12 are connected
Also, the cooling function of each unit cell 13 is reliably ensured. FIG. 8 shows three battery module units 6.
4 is a perspective view showing a manufacturing process of forming a battery pack using
FIGS. 9A and 9B show the three battery module units 64.
Battery pack according to one embodiment of the present invention configured using
The direction perpendicular to the longitudinal direction (left-right direction in FIG. 8) indicating 100
FIG. 4 is a vertical cross-sectional view cut in a direction. This battery pack 100
The three battery module units 64 are
The exterior plate 68 and both of the pair of exterior plates 68
A pair of side parts (front and rear side parts in FIG. 8) interconnecting each other
Side connection plate (shown in FIG. 9) 69, both exterior play
8 and attached to the front end (left end in FIG. 8).
Each battery module is connected so that 20 cells 13 are connected in series.
Positive terminal 32 for external connection and negative terminal
A bus bar for electrically connecting the pole terminals 33 to each other (see FIG.
8) and a rear end of both exterior plates 68 (right end in FIG. 8).
Part) attached to the rear connecting plate (shown in FIG. 9)
71 to be integrated. A pair of exterior plates 68 are clearly shown in FIG.
As described above, each of the three battery module units 64
A total of ten supporting leg projections 63 projecting from the upper and lower surfaces, respectively.
The insertion recess 72 for inserting the
The song is formed. Adjacent between each of the insertion recesses 72
Mounting members 3 of two sets of battery module units 64
7 are provided, on which two mounting surfaces 73 are supported.
At the locations near both ends, each battery module unit located on both sides
Two supporting each mounting member 37 of the knit 64
Mounting surface 74 is provided. Furthermore, exterior plate
68 are bent in a direction perpendicular to the mounting surface 74.
The connection piece 77 is formed. The mounting surfaces 73 and 74
A screw hole 78 is formed at a predetermined position in the connecting piece 77.
Have been. Next, the procedure for assembling the battery pack 100 will be described.
Will be described. Three battery module units 64
Arranges each supporting leg projection 63 projecting downward.
When inserted into the insertion recess 72 of the placed exterior plate 68
In both cases, the screw holes 78 of the mounting surface 73 are
Position to match. Matched screw holes 78 and
A fixing screw 79 is screwed and fastened to the mounting member 37.
And each battery module unit 64
Fixed to the door 68. Subsequently, three battery module units 6
4 has an upper outer plate 68 with an insertion recess 72 thereof.
Project above each battery module unit 64
Each support leg projection 63 is covered at a relative position where it is inserted.
The screw holes 78 of the mounting surface 73 match the mounting members 37.
Position so that Matched screw holes 78 and mounting
Each member 37 is screwed with a fixing screw 79 so that
The battery module unit 64 includes an upper exterior plate 68
Also fixed. Further, as shown in FIG.
The binding plate 69 is formed by connecting each of the upper and lower exterior plates 68.
Apply the positioning to the tie 77 from the outside,
Insert the fixing screw 80 into the side connection plate 69
(Not shown) and screwed into the screw hole 78 of the connecting piece 77
By tying, both upper and lower exterior plates 68
The side connecting pieces 77 are respectively connected via side connecting plates 69.
Connected. Finally, the bus bar 70 and the rear connection
The rate 71 is applied to both ends of the upper and lower
The battery pack is attached by attaching means (not shown).
The lock 100 is completed. The battery pack 100 includes a battery module
12 are easily fixed by screwing together with fixing screws 65.
Battery module unit 64 by easily connecting
Can be configured with multiple battery modules
The unit 64 is placed around a pair of exterior plates 6 around it.
8, side connecting plate 69, rear connecting plate 71 and
And fixing screws 79, 8
Easy integration with simple fixing means just screwing 0
Can be configured. Easy to assemble in such a robust structure
The only thing that can be done is that the battery module 12
Extremely high-precision outer shape uniquely determined by zero molding accuracy
And a relatively large number of
Cells 13 in the holder case 30
Is stored in a state where it is not directly affected by
Is possible. Therefore, this battery pack 100
Can be manufactured with extremely high productivity. On the other hand, the above-mentioned fourth prior art battery
In a pack, a battery module consists of multiple cells
In a row in the direction
Because it is an unstable configuration just connected,
Insert the battery module into both ends of the complicated shape holder case.
Insert through the through holes in the wall or intermediate wall and store in a single row
It takes time and effort, and the outer perimeter of single-row cells
Battery module with a connector or insulating ring protruding on the side
Since the module is inserted and held in the through hole, the battery module
It is difficult to hold the tool without gaps,
When received, the cell rattles in the holder case and breaks
There is a risk of loss. In addition, the above-described fifth prior art technology
Many pond packs have the same configuration as above
Battery module in the lid case in the holder case
And holder ribs protruding from the inner surface of each of the intermediate cases.
Therefore, there is the same drawback as described above. The above battery
Pack 100 eliminates the above-mentioned various disadvantages at once.
You can do it. The battery pack 100 includes a battery module.
Module 12 and the battery module unit 64
Has a heat-radiating passage penetrating up and down with respect to the periphery of the battery 13
In addition to the above, as shown in FIG.
Between the upper and lower outer plates 68 and the upper and lower outer plates 68.
When the heat dissipation passage 82 extending in the horizontal direction is formed,
Between each of the battery module units 64,
The mounting members 37 are vertically opposed to each other, and the intermediate portion is separated.
And a heat radiating passage 83 is formed.
A large number of slit-shaped ventilation holes 81 are formed in the connection plate 71.
Has been established. Therefore, with this battery pack 100
Is a very efficient way to use as many as 120 cells 13
And all can be air-cooled equally. Against this
However, in the conventional battery pack, the temperature for detecting the temperature of the unit cell is used.
Temperature sensor and an operation based on the temperature detected by this temperature sensor.
A blower is provided to increase the configuration.
However, the cost is considerably high. Further, this battery pack 100 is
A module in which the joule 12 stably holds a large number of cells 13
Because of the lock form, the battery module 12
When changing the number of the outer plates 68, side connection
Change shape of plate 69 and rear connecting plate 71
The plates 68, 69, 71
Are all simply bent plate materials?
Can be manufactured at very low cost with different shapes.
You. In contrast, conventional battery packs are extremely complex
The holder case with the shape must be changed,
A considerable amount of time to make a new mold for the holder case
Expensive and costly. The above battery
In the pack 100, both of the pair of exterior plates 68 or
Extends to a length that allows one connecting piece 77 to be connected to each other in series
With such a shape, the side connection plate 69 becomes unnecessary.
Thus, material costs and assembly costs can be further reduced. FIG. 10A shows another embodiment of the present invention.
A flat plate showing a pair of connection plates 84 used in such an inter-battery connection structure.
(B) is a plan view showing the connection structure between batteries.
You. The connection plate 84 is provided between two adjacent cells 13.
It has a length to be bridged, and a single
A diameter substantially equal to the inner diameter of the ring-shaped connection electrode portion 28 of the pond 13.
, Each having a substantially semicircular notch 87 having
In the vicinity of each notch 87, two projects are provided.
A projection 88 for projection welding is formed. In addition, this
The connection plate 84 of Ni-Cu-
It is formed by a three-layer clad material of Ni. The pair of connection plates 84 are formed as shown in FIG.
At a distance between two adjacent cells 13 and each projection
By being projection welded through 88,
One unit cell 1 is formed by a portion of the nugget 89 where the projection 88 is melted.
3 and the bottom surface of the other cell 13.
Be worn. The gap a between the pair of connecting plates 84 is one embodiment.
The width of the slit 40 of the connection plate 38 in the state
It is. Therefore, this battery connection structure has two
Requires a pair of connection plates 84 to connect the single cells 13 of FIG.
However, the connection plate 84 must be provided with through holes and slits.
Instead, since it is simply a shape having a notch 87,
Since it can be mass-produced at low cost, the connection between batteries in one embodiment
There is almost no increase in cost compared to the structure. Moreover, this
The inter-battery connection structure is the same as the inter-battery connection structure of one embodiment.
In addition to obtaining the same effect, the connecting plate 84 of another member
Combined, ineffective shunt during projection welding
There is a great advantage that can be completely eliminated. FIG. 11A shows still another embodiment of the present invention.
FIG. 2B is a plan view showing the inter-battery connection structure according to the embodiment, and FIG.
It is an expanded sectional view of the important section cut | disconnected by the BB line of (a).
In this embodiment, the project in each of the above embodiments is described.
Instead of welding to two cells 13 adjacent to each other.
Connecting the continuous plate 90 by laser welding or beam welding
Things. The connection plate 90 is made of three layers of Ni-Cu-Ni.
A single electrode is placed on both sides of a nearly rectangular flat plate made of clad material.
A through hole 91 having a diameter equal to the inner diameter of the connection electrode portion 28 of the pond 13
Are drilled, and arc-shaped concentric with the through hole 91
The two drawn thin-walled portions 92 have a central portion that is both transparent.
It is formed in an arrangement located on a line connecting the centers of the holes 91.
You. In this battery connection structure, the connection plate 90
To the connection electrode portion 28 of one cell 13 and the other cell 1
In the state where it is placed over the bottom of 3
As shown in (b), a laser beam is applied to each of the narrow portions 92.
Alternatively, irradiate a light beam 93 such as a beam light beam to
The part 92 is welded to the connection electrode part 28 and the bottom part, respectively.
As a result, the two cells 13 are connected to each other via the connection plate 90.
It is configured to be connected to The connection structure between the batteries is the same as that of each of the above embodiments.
In the same manner as the inter-battery connection structure of
The electric resistance is greatly reduced by minimizing the distance L of the current path between the three
In addition to being able to reduce, it is almost the same as the connection structure between batteries of each embodiment.
Similar effects can be obtained. In addition, laser welding
Alternatively, beam welding is performed by irradiating a light beam 93 to the drawn thin portion 92.
, Sufficient welding strength can be ensured,
The contact reliability is improved. Note that this battery connection structure
Is a similar arc-shaped slit instead of the thinned portion 92
The slit is irradiated with a light beam 93 and the laser
Welding or beam welding, and even resistance welding
The connection plate 90 may be connected to both the single cells 13 by using. FIG. 12 shows another embodiment of the present invention.
FIG. 9 is a partial plan view showing the manufacturing process of the battery module 94.
Therefore, the difference from the battery module 12 of the embodiment is
The only difference is that the shape of the holder case 30 is partially different.
You. That is, each battery storage section 31 of the holder case 30
Is a square in plan view in one embodiment.
And has a rectangular shape in plan view and
The support ribs 95 are respectively provided from the inner surfaces of the opposing partition walls in the longitudinal direction of
It is protruded integrally. The two support ribs 95 are respectively
Is the outer diameter of the battery case 14 of the cell 13
Almost the same, the outer surface of the cell 13 is
Abut on both sides in the radial direction. Therefore, in this battery module 94,
Are the same as described in the battery module 12 of one embodiment.
In addition to obtaining the same effects, the protrusion length of the support rib 95
A gap 44 between the cell 13 and the partition wall of the battery housing 31
And the volume of the gap 47 between the connection plate 38 and the partition wall is increased.
The amount of air flowing through the gaps 44 and 47
It is possible to more effectively cool the unit cells 13 by air.
You. FIG. 13 shows still another embodiment of the present invention.
FIG. 14 is an exploded perspective view showing the battery module 96.
(A) shows the lower cover of the battery module 96 turned upside down.
The perspective view of FIG.
It is a perspective view showing pond module 96. One implementation of FIG.
In the battery module 12 in the form, ten unit cells 13 are
Illustrates a case where two battery rows are arranged side by side.
In contrast, the battery module 96 according to this embodiment
In this configuration, ten single cells 13 are stored in a line.
It has become. This battery module 96 is one embodiment.
A configuration substantially equivalent to the configuration in which the battery module 12 of FIG.
The battery module 12
Those are given the same reference numerals, and duplicate descriptions are omitted.
Hereinafter, differences from the battery module 12 will be described.
I will explain only. The cell 13 is described in each of the above embodiments.
It is the same as what was done. Holder case 35
Battery storage units 31 are arranged in a row,
Positive terminal 32 for external connection and negative terminal 3 for external connection
3 are formed at both ends. Connection plate 38 is an embodiment
It is the same as the state. Upper and lower elastic sheets 36, 45
The gap between the unit cell 13 and the partition of the battery storage unit 31
The triangular cutouts 55 and 56 corresponding to
Are formed on both sides. The upper cover 67 is provided with the notch 5 of the elastic sheet 36.
A triangular heat dissipation hole 75 is formed at a position corresponding to 5.
And each connecting member 34 of the holder case 35
A notch 76 for escape is formed at a position corresponding to.
The lower lid 85 corresponds to the notch 56 of the elastic sheet 45.
A triangular heat dissipation hole 86 is formed at the position
The position corresponding to each connecting member 34 of the holder case 35
A notch 97 for escape is formed in the place, and FIG.
As shown in the figure, five supporting leg projections 63 are provided on the lower surface.
ing. The battery module 96 is one embodiment.
Of the same assembly procedure as described for the battery module 12 of FIG.
It is assembled into a shape as shown in FIG. This
The pond module 96 is a battery module 1 according to an embodiment.
Almost the same, only the output voltage is halved compared to 2.
The same effect can be obtained
it can. As an application, two batteries are connected via the connecting member 34.
Modules 96 are connected to each other to
After configuring the battery module,
By connecting the number, for example, lower than electric vehicles
Drive power for electric bicycles and electric tools with high drive power
Suitable for vibration and shock.
It becomes As described above, the inter-battery connection structure of the present invention
According to the above, both sides of the connection plate, which is merely a flat plate, are
Can be welded to two single cells in a stable position.
High yield with no risk of failure
Improve in width. Also, contact between the connection plate and the connection electrode part
Join between the connecting plate and the bottom of the battery case respectively
Welding only needs to be performed twice in total, greatly reducing the number of weldings.
The productivity is greatly improved. In addition, the cell
By arranging these battery axes in parallel,
The current path between the single cells is
Between the connecting electrode portion and the outer peripheral portion of the bottom surface of the other unit cell.
It is the shortest distance connecting the places that are close to each other, and the electrical resistance
Can be greatly reduced. According to the battery module of the present invention,
External dimensions depending on the molding accuracy of the synthetic resin holder case
The law is uniquely determined and after the assembly process
High-precision shape with no fluctuation
It becomes. In addition, each cell is completely contained in each battery compartment.
Is kept electrically insulated from the battery.
Insulation ring and resin outer tube in Joule
Is no longer required, reducing material costs and improving productivity.
Can be In addition, each cell is stored in the battery compartment.
It is fixed in the case of
It is securely held without rattling. Also, each cell is
Extremely effective cooling by wind flowing through the heat dissipation passage
And relatively evenly cool a relatively large number of cells
Can be rejected. Further, according to the battery pack of the present invention, the battery
Simple connection between modules using fixing members such as fixing screws
Battery module unit that can be easily connected by fixing means
Are arranged side by side, and a plurality of exterior
Simple fixing hand with fixing member such as fixing screw on plate
Easy integration into steps, but also very robust construction
Production with extremely high productivity.
Can be. When changing the number of battery modules,
In case, the shape of the exterior plate that can be formed by bending the plate material
Only needs to be changed, which can be handled at extremely low cost. Further
When multiple battery modules are integrated,
Since the cooling function of each cell is ensured,
A cooling mechanism such as a cooling fin blade becomes unnecessary.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an arrangement of components of a battery module according to one embodiment of the present invention. FIG. 2 is a perspective view of the battery module in which the lower lid is turned upside down. FIG. 3A is a perspective view showing a unit cell which is a component of the above battery module, and FIG. 3B is a sectional view taken along line AA of FIG. FIGS. 4A and 4B show an inter-battery connection structure according to an embodiment of the present invention applied to connection of cells in the above battery module, wherein FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. FIG. 3A is an enlarged sectional view taken along line BB of FIG. FIG. 5 is a partial plan view showing a state in which the unit cells inserted into the storage space of the holder case are connected by a connection plate in a process of manufacturing the battery module. FIG. 6 is a perspective view showing a state in which the battery module is completely assembled. FIG. 7 is an exemplary perspective view showing an arrangement in a manufacturing process in which three battery module units are configured by using six battery modules according to the first embodiment; FIG. 8 is a perspective view showing a manufacturing process of forming a battery pack using the three battery module units according to the embodiment. FIG. 9 is a vertical cross-sectional view of the battery pack according to the embodiment of the present invention, which is configured using the three battery module units according to the embodiment, and is cut in a direction perpendicular to the longitudinal direction. FIG. 10 (a) is a plan view showing a pair of connection plates used for an inter-battery connection structure according to another embodiment of the present invention, and (b).
Is a plan view showing the connection structure between batteries. 11A is a plan view showing a connection structure between batteries according to still another embodiment of the present invention, and FIG.
The enlarged sectional view of the principal part cut | disconnected by the B line. FIG. 12 is a partial plan view showing the process of manufacturing the battery module according to another embodiment of the present invention. FIG. 13 is an exploded perspective view showing a battery module according to still another embodiment of the present invention. FIG. 14A is a perspective view of the battery module in which the lower lid is turned upside down, and FIG. 14B is a perspective view of the battery module in which the battery module is completely assembled. FIG. 15 is a longitudinal sectional view showing a conventional inter-battery connection structure. FIG. 16 is a perspective view showing a battery module configured using the above battery connection structure. [Description of Signs] 12, 94, 96 Battery module 13 Single cell 14 Battery case 18 Sealing body 28 Connection electrode part 29 Depression 30, 35 Holder case 31 Battery storage part 32 Positive terminal for external connection 33 Negative terminal for external connection 34 Connection Member 37 Mounting member 38, 84, 90 Connecting plate 44, 47 Air gap 36, 45, 48, 49 Elastic sheet 50, 51 Heat radiating hole 52 of elastic sheet Notch 53, 67 for heat radiation Upper lid (lid member) 54, 85 Lower lid (lid member) 57-60 Heat dissipation hole 63 of lid member Support leg projection 64 Battery module unit 65, 79 Fixing screw (fixing member) 100 Battery pack 68 Exterior plate 70 Bus bar 71 Rear connection plate (connection plate) 72 insertion recess 73, 74 mounting surface 75, 86 heat-dissipating hole 81 of lid member ventilating hole 92 throttle thin portion 95 support rib
Claims: 1. A battery case having a bottomed cylindrical shape also serving as one electrode, and a sealing body which is closed in an electrically insulated state with respect to an opening of the battery case and also serves as the other electrode. With
A plurality of cells having a ring-shaped connection electrode portion protruding outward in the battery axis direction at a location near the outer periphery of the sealing body are provided, and the cells are juxtaposed in such an arrangement that each cell axis is parallel. A flat connection plate is placed so as to bridge over the connection electrode portion of one of the unit cells and the bottom surface of the battery case of the other unit cell of the two adjacent cells, A connection structure between batteries, wherein the connection electrode portion and the bottom surface portion of the battery case are connected to each other by welding at locations close to each other. 2. An indented concave portion is formed in the center of the bottom surface of the battery case, and one side of the connection plate is located on the bottom surface of the battery case near the unit cell adjacent to the outer portion of the concave portion. The inter-battery connection structure according to claim 1, which is welded to the battery. 3. The inter-battery connection structure according to claim 1, wherein the connection plate is formed in a flat plate shape by using a three-layer clad material of Ni—Cu—Ni. 4. Each of two adjacent cells is welded on both sides in a state in which a pair of connection plates of the same shape which are arranged in close proximity to each other with a small gap are bridged, 4. The inter-battery connection structure according to claim 1, wherein the two connection plates are electrically connected to each other. 5. The connecting plate has a thin-walled portion formed at least at a position in contact with each of two adjacent unit cells at least in proximity to each other, and the thin-walled narrowed portion is laser-welded or beam-welded. 4. The inter-battery connection structure according to claim 1, wherein the inter-battery connection structure is welded to the both cells. 6. A unit cell having a substantially rectangular parallelepiped outer shape having a thickness substantially equal to the length of the unit cell in the battery axis direction, and having a square shape in a plan view having one side substantially equal to the outer diameter of the cylindrical unit cell, and having the thickness direction. A plurality of battery housing portions penetrating through the battery housing portion are formed in a single row or a plurality of rows, each having a holder case made of synthetic resin, and two adjacent ones of the unit cells individually inserted into the battery housing portions. 6. The battery according to claim 1, wherein
Electrically connected and mechanically connected by the inter-battery connection structure according to any one of the above, wherein the opening portions on both sides in the thickness direction of the holder case are respectively closed with lid members fixed thereto, In the lid member, a heat radiation hole having a shape corresponding to each of the gaps is formed at a location corresponding to a gap between the unit cell and the partition wall of the battery storage section and a gap between the connection plate and the partition wall. A battery module comprising: 7. A gap between a unit cell and a partition of a battery housing portion and a gap between the connection plate and the partition between each connection plate and each lid member on both sides in the thickness direction of the holder case. 7. The battery module according to claim 6, wherein elastic sheets each having a heat-dissipating hole and a heat-dissipating notch formed in a shape corresponding to each of the gaps are interposed at positions corresponding to the respective gaps. 8. The battery accommodating portion of the holder case has, instead of a square shape in a plan view, the first two opposing sides substantially equal to the outer diameter of the unit cell, and the other two opposing second sides are the same. First
Are formed in a rectangular shape in plan view that is larger than the two sides, and a pair of inner surfaces of the second two sides are set such that the distance between the respective tips is substantially equal to the outer diameter of the cell. The battery module according to claim 6, wherein the support ribs are respectively provided to protrude. 9. The holder case has a positive terminal and a negative terminal for external connection at one end or both ends in the direction in which the battery housing portion is disposed, and connecting members on both sides in the disposing direction by insert molding. 9. The battery module according to claim 6, wherein the positive electrode terminal and the negative electrode terminal are connected to unit cells adjacent to the positive electrode terminal and the negative electrode terminal by a connection plate. 10. The holder case for a battery module according to claim 9, wherein a connecting member is insert-molded at one end in a thickness direction on both sides with respect to the disposing direction, and a mounting member is insert-molded at the other end in the thickness direction. And the other one of the two battery modules is overlapped at a relative position where the direction of the thickness direction is inverted, and the two battery modules are connected to each other by a fixing member. A plurality of battery module units that are integrated with each other are provided; a plurality of the battery module units are covered with a plurality of exterior plates in a state of being arranged in parallel; and the mounting member is attached to the exterior case. The positive electrode terminal and the negative electrode terminal for external connection of each of the battery modules are fixed by a fixing member to be integrated. A battery pack, wherein each battery module is pneumatically connected, and each unit cell built in each battery module is connected in series. 11. The battery module unit 2
A plurality of supporting leg protrusions extending outward in the direction of stacking of the two battery modules are integrally provided on a cover member located outside each of the plurality of battery modules, and a plurality of exterior cases are provided with the respective battery modules. An insertion recess for accommodating each of the support leg projections of the unit at a relative position where the tip of the support leg abuts, and an attachment member of the battery module unit provided on a side portion of the insertion recess and fixed in a contact state. 11. The battery pack according to claim 10, further comprising: a connection plate connecting the plurality of outer cases to each other, wherein a plurality of ventilation holes are formed in the connection plate.
JP2001360930A 2001-11-27 2001-11-27 Battery connection structure, battery module, and battery pack Expired - Fee Related JP3848565B2 (en)
JP2001360930A JP3848565B2 (en) 2001-11-27 2001-11-27 Battery connection structure, battery module, and battery pack
EP20020780048 EP1450422A4 (en) 2001-11-27 2002-11-07 Battery connection structure, battery module, and battery pack
PCT/JP2002/011634 WO2003047013A1 (en) 2001-11-27 2002-11-07 Battery connection structure, battery module, and battery pack
CNB028233700A CN100370640C (en) 2001-11-27 2002-11-07 Battery connection structure, battery module, and battery pack
US10/495,434 US20050079408A1 (en) 2001-11-27 2002-11-07 Battery connection structure, battery module, and battery pack
JP2003162993A true JP2003162993A (en) 2003-06-06
JP3848565B2 JP3848565B2 (en) 2006-11-22
ID=19171670
JP2001360930A Expired - Fee Related JP3848565B2 (en) 2001-11-27 2001-11-27 Battery connection structure, battery module, and battery pack
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EP (1) EP1450422A4 (en)
JP (1) JP3848565B2 (en)
CN (1) CN100370640C (en)
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