Source: https://patents.google.com/patent/JP2010080135A/en
Timestamp: 2020-08-05 17:19:18
Document Index: 455386542

Matched Legal Cases: ['art 21', 'art 21', 'art 21', 'art\n6', 'art\n7', 'art\n9', 'art 42', 'art\n57', 'art 67', 'art\n67']

JP2010080135A - Battery system - Google Patents
JP2010080135A
JP2010080135A JP2008244923A JP2008244923A JP2010080135A JP 2010080135 A JP2010080135 A JP 2010080135A JP 2008244923 A JP2008244923 A JP 2008244923A JP 2008244923 A JP2008244923 A JP 2008244923A JP 2010080135 A JP2010080135 A JP 2010080135A
JP2008244923A
JP5372449B2 (en
邦穂 田中
2008-09-24 Application filed by Sanyo Electric Co Ltd, 三洋電機株式会社 filed Critical Sanyo Electric Co Ltd
2008-09-24 Priority to JP2008244923A priority Critical patent/JP5372449B2/en
2010-04-08 Publication of JP2010080135A publication Critical patent/JP2010080135A/en
2013-12-18 Publication of JP5372449B2 publication Critical patent/JP5372449B2/en
<P>PROBLEM TO BE SOLVED: To detect voltages of a number of battery cells at extremely high accuracy by lowering and equalizing impedances of wire paths connecting each battery cell and battery-state detecting circuits. <P>SOLUTION: The battery system for a vehicle is provided with a battery block 2 formed by laminating a plurality of battery cells 1 with a terminal face 1A fitting an electrode terminal 13 as the same plane of a terminal plane 2A, and battery state detecting circuits 30 connected with the electrode terminal 13 of each battery cell 1. The battery system is provided with a circuit board 7 fixing electronic components 40 for obtaining the battery state detecting circuits 30. The circuit board 7 is a one-side mounting board fixing the electronic components 40 on one face, opposed to the terminal plane 2A of the battery block 2, and fixed to the battery block 2 in a posture of arranging the electronic components 40 on a face opposite to a face opposed to the terminal plane 2A. The battery system connects positive and negative electrode terminals 13 of each battery cell 1 with the circuit board 7 and with the battery state detecting circuits 30. <P>COPYRIGHT: (C)2010,JPO&INPIT
The present invention relates to a vehicle battery system in which a battery state detection circuit is connected to a battery block formed by connecting a plurality of battery cells in a stacked state.
In a vehicle battery system, a large number of battery cells are stacked, and the battery cells are connected in series to increase the output voltage. In this battery system, charging / discharging is controlled while detecting the state of each battery cell to prevent deterioration of the battery cell. Each battery cell connected in series is charged and discharged with the same current. The remaining capacity is calculated by integrating the charging / discharging current flowing through the battery, and the charging / discharging is controlled so that the remaining capacity is within the set range. The remaining capacity is calculated by adding the integrated value of charging current and subtracting the integrated value of discharging current. Battery cells charged and discharged with the same current have a difference in substantial remaining capacity as time passes. This is because the difference in temperature and electrical characteristics of each battery cell changes the substantial charge / discharge. If there is a difference in the substantial remaining capacity, a battery cell with a small remaining capacity is easily overdischarged, and a battery cell with a large remaining capacity is easily overcharged, causing deterioration of the battery cell. This is because the battery cell is significantly deteriorated by overcharge or overdischarge. Since a battery system for a vehicle is provided with a large number of battery cells, the manufacturing cost is extremely high, and it is extremely important to extend the life.
The deterioration of the battery cell can be prevented by detecting the voltage of each battery cell and controlling the substantial remaining capacity within the set range. For this reason, a battery system in which a large number of battery cells are connected in series to form a battery block includes a battery state detection circuit that detects the voltage of each battery cell. This battery state detection circuit is provided in the vicinity of the battery block, and is connected to the positive and negative electrode terminals of each battery cell via a wire harness. (See Patent Document 1)
In a vehicle battery system in which a large number of battery cells are stacked, for example, as shown in the schematic diagram of FIG. 1, a wire harness 94 is connected to an electrode terminal 93 of each battery cell 91, and this is connected to the battery block 92. It is connected to a battery state detection circuit 90 provided outside. The wire harness 94 bundles a large number of long lead wires 95 and connects each lead wire 95 to the electrode terminal 93 and the battery state detection circuit 90 of each battery cell 91. In addition to the length of the wire harness 94, the length of the lead wire 95 connected to each battery cell 91 is different, and the lead wire 95 connected to the battery cell 91 far from the battery state detection circuit 90 is extremely long. Become. A long and different wire harness has a considerably large lead wire impedance, and the lead wire can have a considerable difference in impedance. The difference in lead wire impedance causes a detection error in which the battery state detection circuit detects the voltage of each battery cell. In particular, the battery state detection circuit needs to detect the voltage difference between the battery cells with extremely high accuracy. For example, a battery system in which a battery cell uses a lithium ion battery is required to detect the voltage of each battery cell with an accuracy of, for example, 0.05 V or higher, and preferably with an extremely high accuracy of 0.02 V or higher. Since the conventional battery system uses a wire harness in which very long lead wires are bundled, a large impedance of the wire harness has caused a reduction in measurement accuracy of each battery cell.
In addition, conventional battery systems connect a wire harness that bundles long lead plates to each battery cell, causing malfunctions due to disconnection of the wire harness, and smoke and fire caused by shorts between wires. There was also a drawback.
Japanese Patent Laid-Open No. 2008-140631
The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is for a vehicle capable of detecting the voltage of a large number of battery cells with extremely high accuracy by making the impedance of a line connecting each battery cell and a battery state detection circuit low and uniform. It is to provide a battery system.
Another important object of the present invention is to effectively prevent smoke and fire due to disconnection or short-circuiting of the wire harness that connects a large number of battery cells to the battery state detection circuit, thereby ensuring that the battery state detection circuit is stable. Another object of the present invention is to provide a vehicle battery system that can detect the state of each battery cell and improve reliability and safety.
The battery system for a vehicle according to the present invention includes a battery block 2 in which a plurality of battery cells 1 are fixed in a stacked state as a terminal plane 2A in which a terminal surface 1A provided with positive and negative electrode terminals 13 is positioned on the same plane. The battery block 2 includes a battery state detection circuit 30 that is connected to the electrode terminal 13 of each battery cell 1 and detects the state of each battery cell 1. Further, the battery system includes circuit boards 7, 57, 67, and 87 for fixing the electronic component 40 that realizes the battery state detection circuit 30. The circuit boards 7, 57, 67, 87 are single-sided mounting boards in which the electronic component 40 is fixed to one side. The circuit boards 7, 57, 67, 87 face the terminal block 2 A of the battery block 2, and the electronic component 40 is arranged on the surface opposite to the facing surface facing the terminal plane 2 A on the battery block 2. It is fixed. Further, in the battery system, the positive and negative electrode terminals 13 of each battery cell 1 are connected to the circuit boards 7, 57, 67, 87 and connected to the battery state detection circuit 30.
The battery system described above can make the impedance of the line connecting each battery cell and the battery state detection circuit low and uniform, thereby detecting the voltages of a large number of battery cells with extremely high accuracy. There are features. The circuit board on which the above battery system mounts the battery state detection circuit is placed so as to face the terminal plane of the battery block, so the positive and negative electrode terminals of each battery cell are connected to the circuit board at the shortest distance. Because it can.
In addition, the battery system described above effectively prevents smoke and fire due to disconnection or short-circuiting of the wire harness that connects a large number of battery cells to the battery state detection circuit, and the battery state detection circuit reliably and stably There is a feature that the state of the battery cell can be detected to improve reliability and safety. This is because the above battery system fixes the circuit board on which the battery state detection circuit is mounted so as to face the terminal plane of the battery block, and connects the positive and negative electrode terminals of each battery cell to the circuit board. It is. This structure can connect the electrode terminal to the circuit board fixed close to the electrode terminal of the battery cell without using a long wire harness, and connect the electrode terminal of each battery cell to the circuit board. Wiring can be done without bundling or crossing the lead wires. For this reason, a short circuit of the lead wire can be reliably prevented.
Further, in the battery system described above, the circuit board is disposed so as to face the terminal plane of the battery block, and the electronic component that realizes the battery state detection circuit is fixed on one side using the circuit board as a single-sided board. Is fixed to the surface opposite to the surface facing the battery block. In this structure, the electronic component is not fixed to the surface facing the battery block, and the conductive part of the circuit board that connects the electronic component and the electronic component does not contact the electrode terminal of the battery cell. There is a feature that can prevent short circuit more reliably. In addition, since the electronic components are arranged on one side of the circuit board, the circuit board can be thinned and the battery system can be thinned.
In the vehicle battery system of the present invention, the circuit boards 57 and 67 can be provided with insulating layers 57Y and 67Y on the surface facing the battery block 2.
The battery system described above has a feature that the short circuit of the battery cell can be more reliably prevented by the insulating layer provided on the surface of the circuit board facing the battery block.
In the vehicle battery system of the present invention, a temperature sensor 38 that is thermally coupled to the battery cell 1 and detects the battery temperature can be connected to the circuit boards 7 and 87.
The battery system described above can reliably connect the temperature sensor and the battery state detection circuit at the shortest distance while arranging the temperature sensor at an ideal position.
In the battery system for a vehicle of the present invention, the battery cell 1 is provided with the liquid injection hole 14 on the terminal surface 1A, and the circuit boards 7 and 87 are formed in the through hole 7A at a position facing the liquid injection hole 14 of the battery cell 1. , 87A can be opened.
In the above battery system, a large number of battery cells are connected to form a battery block, and liquid can be injected into each battery cell in a state where a circuit board is fixed to the battery block. For this reason, it is not necessary to inject and hold the battery cell with a tray so that it does not swell as in the past, and pressurize and hold the swelled battery cell by injecting it and removing it from the tray and holding it in a predetermined shape There is no need to assemble the battery block. Moreover, since it can inject | pour in the state which connected many battery cells, it is not necessary to set a battery cell to the tray for an injection, and there exists the characteristic which can perform an injection process efficiently.
In the vehicle battery system of the present invention, the battery cell 1 is provided with the safety valve discharge port 12 on the terminal surface 1A, and the circuit board 87 is a gas vent hole 87B through which gas passes at a position opposite to the safety valve discharge port 12. Can be provided.
The battery system described above can smoothly exhaust the gas when the safety valve is opened and the gas is discharged in the use state.
In the vehicle battery system of the present invention, the battery cell 1 is provided with a safety valve discharge port 12 on the terminal surface 1A, and the terminal plane 2A of the battery block 2 and the circuit board 7 are connected to the discharge port 12. A gas discharge duct 6 can be arranged between the two.
The above battery system can smoothly exhaust the gas discharged from the safety valve through the gas discharge duct, and even if the exhaust gas reaches a high temperature, the battery and the circuit board are not adversely affected by heat.
In the vehicle battery system of the present invention, the circuit board 7 can be fixed to the gas discharge duct 6.
In the above battery system, the circuit board can be reliably fixed to the battery block via the gas discharge duct fixed to the battery block.
In the vehicle battery system of the present invention, the circuit boards 7, 57, 67, 87 are connected to the positive and negative electrode terminals 13 of the respective battery cells 1 through the voltage detection lines 8, 48, 58, 68, 78. The voltage detection lines 8, 48, 58, 68, 78 can be connected to substantially the same position of the electrode terminal 13.
In the vehicle battery system of the present invention, one end of the voltage detection line 48 connected to the electrode terminal 13 is connected to the connector 42, and this connector 42 is connected to the connector 43 fixed to the circuit board 7, so that the electrode terminal is connected. 13 and the circuit board 7 can be connected.
In the vehicle battery system of the present invention, the circuit board 7 is connected to the positive and negative electrode terminals 13 of each battery cell 1 via the voltage detection lines 58 and 68, and each voltage detection line 58 and 68 is elastically connected. A conductive metal wire that can be deformed can be obtained.
Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a vehicle battery system for embodying the technical idea of the present invention, and the present invention does not specify the vehicle battery system as follows.
The battery system of the present invention is mainly suitable for the power source of an electric vehicle such as a hybrid car that runs with both an engine and a motor and an electric vehicle that runs with only a motor.
The battery system shown in FIGS. 2 to 7 is connected to a battery block 2 that fixes a plurality of battery cells 1 in a stacked state, and to an electrode terminal 13 of each battery cell 1 that constitutes the battery block 2. The battery state detection circuit 30 which detects the state of the battery cell 1 is provided.
The battery block 2 is laminated so that the terminal surfaces 1A (upper surfaces in FIG. 4) of the battery cells 1 provided with the positive and negative electrode terminals 13 are located on the same plane, and the upper surface of the battery block 2 is a terminal plane 2A. . The battery block 2 has the battery cells 1 stacked on the outside thereof fixed by a battery holder 3. As shown in FIG. 8, the battery cell 1 has a rectangular outer shape, and the upper surface is a terminal surface 1 </ b> A in the figure, and is provided with positive and negative electrode terminals 13, a safety valve discharge port 12, and a liquid injection hole 14. This is a square battery 10.
As shown in FIG. 8, the prismatic battery 10 is a prismatic battery 10 that is wider than the thickness, that is, thinner than the width, and is stacked in the thickness direction to form the battery block 2. This rectangular battery 10 is a lithium ion secondary battery. However, the square battery may be a secondary battery such as a nickel metal hydride battery or a nickel cadmium battery. A rectangular battery 10 shown in the figure is a battery having a rectangular shape with both wide surfaces, and the battery blocks 2 are laminated so that both surfaces are opposed to each other. The square battery 10 has positive and negative electrode terminals 13 projecting from both ends of the terminal surface 1A, and a safety valve discharge port 12 at the center.
The safety valve opens when the internal pressure of the rectangular battery 10 becomes higher than the set pressure, thereby preventing the internal pressure from increasing. This safety valve has a built-in valve body (not shown) for closing the discharge port 12. The valve body is a thin film that is destroyed at a set pressure, or a valve that is pressed against the valve seat by an elastic body so as to open at the set pressure. When the safety valve is opened, the inside of the prismatic battery 10 is opened to the outside through the discharge port 12, and the internal gas is released to prevent the internal pressure from increasing.
Further, the square battery 10 bends the positive and negative electrode terminals 13 in opposite directions, and the adjacent square batteries bend the positive and negative electrode terminals 13 in a direction facing each other. In the illustrated battery system, positive and negative electrode terminals 13 of adjacent rectangular batteries 10 are connected in a stacked state and connected in series. As shown in FIG. 9, the electrode terminals 13 connected in a stacked state are connected by a connector 20 such as a bolt 20A and a nut 20B. However, the square batteries can be connected in series by connecting positive and negative electrode terminals with a bus bar. A battery system in which adjacent rectangular batteries 10 are connected in series can increase the output voltage and increase the output. However, the battery system can also connect adjacent rectangular batteries in parallel.
The battery block 2 has a spacer 15 sandwiched between the stacked rectangular batteries 10. The spacer 15 insulates the adjacent rectangular batteries 10. As shown in FIG. 8, the spacers 15 can be stacked so that the adjacent rectangular batteries 10 are not displaced as a shape in which the prismatic batteries 10 are fitted on both surfaces and arranged in a fixed position. In the rectangular battery 10 that is insulated and stacked by the spacer 15, the outer can 11 can be made of a metal such as aluminum. The battery block can also be fixed by stacking a plurality of battery cells without interposing a spacer. Although not shown, this battery cell is insulated by covering the surface of a metal outer can of the rectangular battery with an insulating coating. A plastic heat-shrinkable tube or insulating paint can be used for this insulating coating. Further, in the prismatic battery of the battery cell, the outer can can be made of an insulating material such as plastic. These prismatic batteries can be stacked to form a battery block without interposing a spacer.
The spacer 15 stacked on the battery cell 1 is provided with a cooling gap 16 for allowing a cooling gas such as air to pass between the battery cell 1 and the battery cell 1 in order to effectively cool the battery cell 1. The spacer 15 in FIG. 8 is provided with a groove 15 </ b> A extending to both side edges on the surface facing the battery cell 1, and a cooling gap 16 is provided between the spacer 15 and the battery cell 1. In the illustrated spacer 15, a plurality of grooves 15 </ b> A are provided in parallel with each other at a predetermined interval. In the illustrated spacer 15, grooves 15 </ b> A are provided on both surfaces, and a cooling gap 16 is provided between the battery cell 1 and the spacer 15 adjacent to each other. This structure has an advantage that the battery cells 1 on both sides can be effectively cooled by the cooling gaps 16 formed on both sides of the spacer 15. However, the spacer can be provided with a groove only on one side, and a cooling gap can be provided between the battery cell and the spacer. The cooling gap 16 in FIGS. 3 and 4 is provided in the horizontal direction so as to open to the left and right of the battery block 2. The air forcedly blown into the cooling gap 16 directly and efficiently cools the outer can 11 of the battery cell 1. This structure is characterized in that the battery cell 1 can be efficiently cooled while effectively preventing thermal runaway of the battery cell 1.
The battery holder 3 that fixes the battery cell 1 in a stacked state includes a pair of end plates 4 that sandwich the battery block 2 from both end surfaces, and a connection that is formed by connecting both ends or intermediate portions to the pair of end plates 4. And a fixture 5. The connection fixture 5 is disposed on the outer peripheral surface of the prismatic battery 10 and connects both end portions or intermediate portions to the end plate 4. The battery holder 3 has both end surfaces of the battery block 2 on which the battery cell 1 is stacked sandwiched between a pair of end plates 4, and ends both ends of a connecting fixture 5 disposed on the outer peripheral surface of the prismatic battery 10. With a structure connected to the plate 4, the plurality of prismatic batteries 10 are firmly fixed in a stacked state.
The end plate 4 is formed as a quadrangle having the same shape and dimensions as the outer shape of the prismatic battery 10, and the stacked battery blocks 2 are sandwiched and fixed from both end surfaces. The end plate 4 is made of plastic or metal, and is provided with integrally formed reinforcing ribs 4A extending vertically and horizontally on the outer surface. Further, the end plate 4 shown in the drawing fixes the reinforcing metal fitting 17 along the upper edge, and connects the connecting fixture 5 to the reinforcing metal fitting 17. This structure is characterized in that the upper edge of the end plate 4 can be reinforced by the reinforcing metal fitting 17 to be a strong structure, and the connecting fixture 5 can be firmly connected. In particular, this structure is characterized in that the end plate 4 can be molded with plastic to strengthen itself. However, it is not always necessary to reinforce the end plate with the reinforcing metal fitting. For example, the end plate is made of metal, and the connecting fixture can be directly fixed without providing the reinforcing metal fitting. The connection fixture 5 is made of metal such as iron, and both ends or the middle thereof are fixed to the end plate 4 with set screws 18.
6 and 7 show block diagrams of the battery system. In the battery system of this block diagram, a battery state detection circuit 30 is connected to each battery cell 1. The battery state detection circuit 30 shown in FIG. 7 includes a voltage detection circuit 31 that detects the voltage of each battery cell 1, a cell balance circuit 32 that equalizes the voltage of each battery cell 1 and equalizes the cell balance, A temperature detection circuit 33 that detects the temperature of the battery, and a control circuit 34 that controls these circuits, processes signals input from these circuits, and outputs the processed signals to the outside via the insulation communication circuit 35 I have. The battery system of FIG. 6 includes a plurality of battery blocks 2, and inputs a signal output from the battery state detection circuit 30 connected to each battery block 2 to the main control circuit 36. The main control circuit 36 controls the battery system based on a signal input from each battery state detection circuit 30.
The electronic component 40 that realizes the battery state detection circuit 30 is mounted on the circuit board 7. The circuit board 7 is a single-sided mounting board in which the electronic component 40 is fixed to one side. The circuit board 7 fixing the electronic component 40 on one side faces the terminal plane 2A of the battery block 2 as shown in FIGS. 3 to 5 and is fixed on the battery block 2 in the drawing. Further, the single-sided circuit board 7 is fixed to the battery block 2 in such a posture that the electronic component 40 is disposed on the opposite side of the surface facing the terminal plane 2A of the battery block 2. FIGS. 10 to 12 show a state in which the single-side mounted circuit board 7 is fixed to the battery block 2. In these drawings, the circuit board 7 mounted on one side has the electronic component 40 fixed to the upper surface, and the lower surface is the surface facing the battery block 2. That is, the electronic component 40 is not fixed to the back surface of the circuit board 7 facing the battery block 2. The circuit board 7 of FIGS. 10 to 12 is provided with a conductive portion 7a made of a thin metal layer only on the upper surface opposite to the opposing surface, and the lead wire 40a of the electronic component 40 is soldered to the conductive portion 7a. The electronic component 40 is mounted on the upper surface. Further, the circuit board 7 in FIG. 10 is provided with through holes 7S penetrating both surfaces, and the voltage detection lines 8 connected to the electrode terminals 13 are inserted into the through holes 7S and fixed by soldering. In the circuit board 7 of FIG. 11, the voltage detection line 78 connected to the electrode terminal 13 is wired on the circuit board from the side edge of the circuit board 7 and soldered to the conductive portion 7 a provided on the upper surface of the circuit board 7. Connected. Further, the circuit board 7 of FIG. 12 has a connector 43 fixed to the lower surface, and this connector 43 is connected to the connector 42 connected to the electrode terminal 13 via the voltage detection line 48. Since these single-sided circuit boards 7 are provided with the conductive portions 7a on the opposite side of the opposing surface, the insulating substrate 7X of the circuit board 7 is exposed on the opposing surface to the battery block 2 and the insulated surface. Become. This is because the circuit board 7 is manufactured by providing the conductive portion 7a on the surface of the insulating substrate 7X such as phenol resin or glass epoxy resin.
The single-sided circuit board 57 shown in FIG. 13 is inserted into the through hole 57S through the lead wire 40a of the electronic component 40, and the lead wire 40a is fixed to the conductive portion 57a of the circuit board 57 by soldering. An insulating layer 57Y is provided on the opposite surface. The insulating layer 57Y is provided by bonding an insulating sheet or applying an insulating material resist or the like. The insulating material of the insulating layer 57Y can also be an insulating material such as epoxy resin or silicon. A circuit board 67 in FIG. 14 is a two-layer board in which a blind layer 67y to be an insulating layer 67Y is laminated, and the blind layer 67y of the insulating layer 67Y is disposed on the surface facing the battery block 2. The circuit board 67 can insulate the surface facing the battery block 2 with the blind layer 67y of the insulating layer 67Y while soldering and fixing the lead wire 40a of the electronic component 40 to the conductive portion 67a connected to the through hole 67S. . Further, the conductive layer 67b is provided at the boundary with the blind layer 67y, and the heat dissipation of the electronic component 40 can be improved by the conductive layer 67b, or the electric resistance of the conductive portion 67a can be reduced.
The circuit board 7 shown in FIGS. 3 and 4 has both end portions fixed to the end plate 4. Further, the circuit board 7 shown in the figure is fixed on the gas discharge duct 6 fixed to the terminal plane 2 </ b> A of the battery block 2. The circuit board 7 fixed to the gas discharge duct 6 can be firmly fixed to the battery block 2.
The circuit board 7 is provided with a through hole 7 </ b> A for injecting liquid into the outer can 11 from the liquid injection hole 14 provided in the terminal surface 1 </ b> A of the battery cell 1. The through hole 7A is opened at a position facing the liquid injection hole 14 of the battery cell 1. In the battery block 2, battery cells 1 that are not injected are stacked and fixed by an end plate 4 to fix a circuit board 7. In this state, each battery cell 1 is injected to close the liquid injection hole 14 and assembled. The battery block 2 assembled in this state does not need to hold a plurality of battery cells 1 in a tray so as not to swell, and can be stacked and kept in a state where it does not swell to efficiently inject liquid. Moreover, in the state assembled to the battery block 2, since the electrolyte solution is not injected into the outer can 11 of the battery cell 1, it is possible to safely assemble by preventing adverse effects such as a short circuit in this process.
The circuit board 7 approaches the terminal plane 2A of the battery block 2 and is fixed in a posture parallel to the terminal plane 2A. The circuit board 7 in FIG. 5 has a temperature sensor 38 that is thermally coupled to the battery cell 1 and detects the battery temperature fixed to the lower surface. With this structure, the circuit board 7 is fixed so as to face the terminal plane 2A of the battery block 2, and the temperature sensor 38 can be fixed to the battery cell 1 in a thermally coupled state. An insulating heat conductive material 39 is disposed between the temperature sensor 38 and the battery cell 1 so that the temperature of the battery cell 1 can be detected more accurately. The battery state detection circuit 30 that detects the temperature of the battery cell 1 with the temperature sensor 38 outputs the detected temperature to the outside and limits the charge / discharge current when the battery temperature is higher or lower than the set temperature, or Cut off.
The circuit board 7 is connected to the positive and negative electrode terminals 13 of each battery cell 1 through the voltage detection line 8. The voltage detection line 8 connects the positive and negative electrode terminals 13 of all the battery cells 1 to the voltage detection circuit 31 of the battery state detection circuit 30 mounted on the circuit board 7. Therefore, for example, a battery block in which 80 battery cells are stacked is connected to the circuit board via 81 voltage detection lines. The voltage detection circuit 31 detects the voltage of each battery cell 1 via the voltage detection line 8. The battery state detection circuit 30 detects the state of the battery cell 1 with the voltage of the battery cell 1 detected by the voltage detection circuit 31 and outputs the state to the outside.
In the battery block 2 in which the electrode terminals 13 of the adjacent battery cells 1 are stacked and directly connected by the connector 20 or connected via the bus bar, a large current flows and voltage is generated by the electric resistance of the connection portion of the electrode terminal 13. A descent occurs. This voltage drop increases in proportion to the current of the battery block 2. In order to prevent a detection error due to a voltage drop at the connection portion, the voltage detection line 8 is connected to substantially the same position of each battery cell 1, that is, the voltage drop is added to the voltage of each battery cell 1. The
The voltage detection line 8 has one end fixed to the electrode terminal 13 and the other end connected to the circuit board 7. The voltage detection line 8 is fixed to the electrode terminal 13 via the connection terminal 41. As shown in FIG. 9, the connection terminal 41 is fixed to the electrode terminal 13 by a connector 20 that fixes the adjacent electrode terminal 13. The connection terminal 41 shown in this figure is a processed metal plate, and is provided with a connection hole 41A through which the bolt 20A of the connection tool 20 penetrates at one end, and the other end as an elongated rod. The portion is bent upward to form a connecting portion 41B in a vertical posture. The connection terminal 41 penetrates the circuit board 7 through the standing connection portion 41 </ b> B as the voltage detection line 8. The voltage detection line 8 that penetrates the circuit board 7 is fixed to the circuit board 7 by soldering. However, the voltage detection line can be wired from both sides of the circuit board and connected to the circuit board and the electrode terminal. Although not shown, the battery block 2 in which the electrode terminals are connected by the bus bar can be provided with a voltage detection line on the metal plate of the bus bar. Furthermore, the circuit voltage detection line can be directly connected to the electrode terminal by spot welding or laser welding without providing a connection terminal, or can be connected to the electrode terminal via a connector.
In the battery system of FIG. 12, a connector 42 is connected to one end of a voltage detection line 48 connected to the electrode terminal 13, and the connector 42 is connected to a connector 43 fixed to the circuit board 7. In the illustrated battery system, since the gas discharge duct 6 is provided at the center of the terminal surface 1A of the battery cell 1, connectors 42 are provided on both sides of the terminal surface 1A. The connector 42 can be disposed at a fixed position via the voltage detection line 48 or can be fixed to the electrode terminal 13 or the gas discharge duct 6 and disposed at a fixed position. In this structure, the circuit board 7 is pressed against the terminal plane 2A of the battery block 2 to connect the connectors 42 and 43, and the circuit board 7 can be connected to each electrode terminal 13.
Furthermore, the circuit board 7 and each electrode terminal 13 can be connected by voltage detection lines 58 and 68 having the structure shown in FIGS. The voltage detection lines 58 and 68 in FIGS. 15 and 16 are conductive metal wires that can be elastically deformed. The voltage detection line 58 of FIG. 15 is provided with a bent portion 58A that can be expanded and contracted in the middle. The voltage detection line 68 of FIG. 16 is provided with a bending portion 68A that can expand and contract in the middle. These structures can absorb the relative displacement between the circuit board 7 and the battery block 2 and connect the electrode terminals 13 of the respective battery cells 1 to the circuit board 7.
The above voltage detection lines 8, 48, 58, 68, 78 are shortened to lower the impedance, and the lengths of the respective voltage detection lines 8, 48, 58, 68, 78 are made uniform to equalize the impedance. . Therefore, the voltage detection lines 8, 48, 58, 68 and 78 are connected to the circuit board 7 and the electrode terminal 13 with the same length. However, in the battery system, by arranging the circuit board 7 on the terminal plane 2A of the battery block 2, the voltage detection lines 8, 48, 58, 68, and 78 can be made extremely short, so even if the voltage detection line is different in length. Even if there is, the impedance can be reduced and the voltage of each battery cell 1 can be detected accurately. Therefore, as shown in FIG. 12, even if the length of the voltage detection line 48 connected to each electrode terminal 13 can be varied by connecting the connector 42 to the connection side with the circuit board 7, the battery cell 1 Can be accurately detected.
In the battery system of FIGS. 2 to 5, a gas discharge duct 6 is fixed at the center of the terminal plane 2 </ b> A of the battery block 2. In order to fix the gas discharge duct 6 to the end plate 4 with a set screw 19, a connecting piece 6B is provided above the end plate 4 and protrudes on both sides.
Further, the gas discharge duct 6 has an end formed into a cylindrical shape, and is fixed to the end plate 4 as a protruding cylinder 6 </ b> A protruding from the end plate 4. Although not shown, an exhaust duct or the like is connected to the protruding cylindrical portion 6A, so that the gas discharged from the discharge port 12 of the safety valve of the rectangular battery 10 can be quickly discharged to the outside.
Further, in the battery system of FIGS. 2 and 5, the upper case 9 </ b> A of the outer case 9 is fixed on the gas discharge duct 6. The illustrated outer case 9 is composed of a lower case 9B and an upper case 9A. The upper case 9 </ b> A and the lower case 9 </ b> B have a flange 21 protruding outward, and the flange 21 is fixed with a bolt 22 and a nut 23. In the illustrated outer case 9, the flange portion 21 is disposed on the side surface of the battery block 22. In the outer case 9, the lower case 9B is fixed to the end plate 4 with a set screw 24, and the battery block 2 is fixed. The set screw 24 passes through the lower case 9 </ b> B and is screwed into a screw hole (not shown) of the end plate 4 to fix the battery block 2 to the exterior case 9. The set screw 24 projects the head from the lower case 9B.
The upper case 9A is a metal plate and has a shape in which the side plate 9b is connected to both sides of the upper plate 9a that covers the upper surface of the gas discharge duct 6. 9 A of this upper case has the collar part 21 which protrudes outside in the lower end edge of the side plate 9b, and this collar part 21 is connected with the collar part 21 of the lower case 9B. Further, the upper case 9A is provided with a step portion 9c that presses and fixes both sides of the battery block 2 downward along the boundary between the upper surface plate 9a and the side surface plate 9b. The upper case 9 </ b> A is fixed to the battery block 2 by fixing the stepped portion 9 c to the end plate 4 with a set screw 24. The upper case 9 </ b> A is provided with a space 25 between the upper surface of the battery block 2. The circuit board 7 is disposed in the space 25.
Further, the outer case 9 is provided with an exhaust duct 26 and a supply duct 27 between the side plate 9 b and the battery block 2. In this battery system, the air forcedly blown to the supply duct 27 is blown to the cooling gap 16 between the square batteries 10 to cool the square batteries 10 and exhaust from the exhaust duct 26 to the outside. Further, the lower case 9 </ b> B is provided with protruding ridges 28 protruding downward along both sides of the battery block 22. These ridges 28 increase the width of the exhaust duct 26 and the supply duct 27 to reduce the pressure loss of these ducts. Further, these ridges 28 reinforce the lower case 9B and increase the bending strength of the lower case 9B. In particular, since the lower case 9B shown in FIG. 5 is provided with the ridges 28 on both sides, the bending strength can be improved by the two rows of ridges 28 on both sides. Furthermore, the ridges 28 provided on both sides of the lower case 9B protrude below the head of the set screw 24 that fixes the battery block 2 or have the same height as the head. In a state where the lower case 9B is mounted on a vehicle or the like, the ridges 28 can be placed on a fixed plate to support the load of the battery system over a wide area.
The above battery system is provided with the gas discharge duct 6 to discharge the gas from the safety valve opened in the battery cell 1 to the outside. Therefore, high temperature gas can be safely discharged outside. However, as shown in FIG. 17, the battery system is provided with a gas vent hole 87B that allows gas to pass through the circuit board 87 at a position facing the discharge port 12 of the safety valve without providing a gas discharge duct. Thus, the gas can be discharged from the vent hole 87B to the upper side of the circuit board 87. Since this battery system is not provided with a gas discharge duct, the circuit board 87 can be disposed closer to the terminal plane 2A of the battery block 2. Further, the circuit board 87 shown in the figure has a through hole 87A at a position facing the liquid injection hole 14 of the battery cell 1 and a gas vent hole 87B through which gas passes at a position facing the discharge port 12 of the safety valve. In the circuit board, the through hole 87A can be used as a gas vent hole through which gas passes.
It is a schematic plan view of the conventional battery system for vehicles. It is a perspective view of the battery system for vehicles concerning one example of the present invention. FIG. 3 is a perspective view with the upper case of the vehicle battery system shown in FIG. 2 removed. It is a disassembled perspective view of the battery system for vehicles shown in FIG. FIG. 3 is a cross-sectional view of the vehicle battery system shown in FIG. 2. It is a block diagram of the battery system for vehicles concerning one example of the present invention. It is a block diagram of a battery state detection circuit. It is a disassembled perspective view which shows the laminated structure of a battery cell and a spacer. It is an expansion perspective view which shows the connection structure of an electrode terminal and a connection terminal. It is an expanded sectional view which shows the structure which fixes the circuit board of the battery system shown in FIG. 5 to a battery block. It is an expanded sectional view which shows another example which fixes a circuit board to a battery block. It is an expanded sectional view which shows another example which fixes a circuit board to a battery block. It is an expanded sectional view which shows another example of a circuit board. It is an expanded sectional view which shows another example of a circuit board. It is an expanded sectional view showing other examples of a voltage detection line. It is an expanded sectional view showing other examples of a voltage detection line. It is a cross-sectional view of the battery system for vehicles concerning the other Example of this invention.
DESCRIPTION OF SYMBOLS 1 ... Battery cell 1A ... Terminal surface 2 ... Battery block 2A ... Terminal plane 3 ... Battery holder 4 ... End plate 4A ... Reinforcement rib 5 ... Connection fixture 6 ... Gas exhaust duct 6A ... Projection cylinder part
6B ... Connecting piece 7 ... Circuit board 7A ... Through hole
7X ... Insulating substrate
7a: Conductive part
7S ... Through hole 8 ... Voltage detection line 9 ... Exterior case 9A ... Upper case
9a ... Top plate
9b ... Side plate
9c ... Step part
9B ... Lower case 10 ... Square battery 11 ... Exterior can 12 ... Discharge port 13 ... Electrode terminal 14 ... Injection hole 15 ... Spacer 15A ... Groove 16 ... Cooling gap 17 ... Reinforcing metal fitting 18 ... Set screw 19 ... Set screw 20 ... Connection 20A ... Bolt
20B ... Nut 21 ... 鍔 22 ... Bolt 23 ... Nut 24 ... Set screw 25 ... Space 26 ... Exhaust duct 27 ... Supply duct 28 ... Round 30 ... Battery state detection circuit 31 ... Voltage detection circuit 32 ... Cell balance circuit 33 ... Temperature Detection circuit 34 ... Control circuit 35 ... Insulated communication circuit 36 ... Main control circuit 38 ... Temperature sensor 39 ... Heat conduction material 40 ... Electronic component 40a ... Lead wire 41 ... Connection terminal 41A ... Connection hole
41B ... Connection part 42 ... Connector 43 ... Connector 48 ... Voltage detection line 57 ... Circuit board 57Y ... Insulating layer
57a: Conductive part
57S ... Through hole 58 ... Voltage detection line 58A ... Bent part 67 ... Circuit board 67Y ... Insulating layer
67y ... Blind layer
67a: Conductive part
67b ... conductive layer
67S ... through hole 68 ... voltage detection line 68A ... curved portion 78 ... voltage detection line 87 ... circuit board 87A ... through hole
87B ... Gas vent hole 90 ... Battery state detection circuit 91 ... Battery cell 92 ... Battery block 93 ... Electrode terminal 94 ... Wire harness 95 ... Lead wire
A battery block (2) in which a plurality of battery cells (1) are fixed in a stacked state as a terminal plane (2A) on which the terminal surface (1A) provided with positive and negative electrode terminals (13) is located on the same plane A vehicle state detection circuit (30) connected to the electrode terminal (13) of each battery cell (1) constituting the battery block (2) and detecting the state of each battery cell (1) Battery system for
A circuit board (7), (57), (67), (87) for fixing the electronic component (40) for realizing the battery state detection circuit (30), and the circuit boards (7), (57) , (67), (87) is a single-sided board, and the electronic component (40) is fixed to one side, and this single-sided circuit board (7), (57), (67), (87) is the battery. It is fixed to the battery block (2) in a posture to face the terminal plane (2A) of the block (2) and to arrange the electronic component (40) on the surface opposite to the facing surface facing the terminal plane (2A), And the positive and negative electrode terminals (13) of each battery cell (1) are connected to the circuit boards (7), (57), (67), (87) and connected to the battery state detection circuit (30). A battery system for a vehicle.
The battery system for vehicles according to claim 1, wherein the circuit boards (57), (67) are provided with insulating layers (57Y), (67Y) on a surface facing the battery block (2).
The vehicle battery system according to claim 1, wherein a temperature sensor (38) that is thermally coupled to the battery cell (1) and detects a battery temperature is connected to the circuit boards (7) and (87).
The battery cell (1) is provided with a liquid injection hole (14) on the terminal surface (1A), and the circuit board (7), (87) is connected to the liquid injection hole (14) of the battery cell (1). The vehicle battery system according to claim 1, wherein the through holes (7A) and (87A) are opened at opposing positions.
The battery cell (1) is provided with a safety valve outlet (12) on the terminal surface (1A), and the circuit board (87) is a gas vent that allows gas to pass to a position opposite the safety valve outlet (12). The battery system for vehicles described in Claim 1 which has provided the hole (87B) through.
The battery cell (1) is provided with a safety valve discharge port (12) on the terminal surface (1A), and connected to the discharge port (12) so that the terminal plane (2A) of the battery block (2) The vehicle battery system according to claim 1, wherein a gas discharge duct (6) is disposed between the circuit board (7) and the circuit board (7).
The battery system for vehicles according to claim 1, wherein the circuit board (7) is fixed to the gas discharge duct (6).
The circuit boards (7), (57), (67), (87) are connected to each battery cell via the voltage detection lines (8), (48), (58), (68), (78). 1) is connected to the positive and negative electrode terminals (13), and each voltage detection line (8), (48), (58), (68), (78) is substantially the same as the electrode terminal (13). The vehicle battery system according to claim 1, wherein the vehicle battery system is connected to a position.
One end of a voltage detection line (48) connected to the electrode terminal (13) is connected to a connector (42), and the connector (42) is connected to a connector (43) fixed to the circuit board (7). The vehicle battery system according to claim 1, wherein the electrode terminal (13) and the circuit board (7) are connected.
The circuit board (7) is connected to positive and negative electrode terminals (13) of each battery cell (1) via voltage detection lines (58), (68), and each voltage detection line (58) , (68) is a conductive metal wire that can be elastically deformed, and the vehicle battery system according to claim 1.
JP2008244923A 2008-09-24 2008-09-24 Battery system Active JP5372449B2 (en)
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JP2010080135A true JP2010080135A (en) 2010-04-08
JP5372449B2 JP5372449B2 (en) 2013-12-18
ID=42036972
JP2008244923A Active JP5372449B2 (en) 2008-09-24 2008-09-24 Battery system
US (3) US8299801B2 (en)
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