Source: https://patents.google.com/patent/US9318729B2/en
Timestamp: 2020-05-27 22:37:15
Document Index: 50356079

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US9318729B2 - Power tool battery pack - Google Patents
Power tool battery pack Download PDF
US9318729B2
US9318729B2 US14/243,260 US201414243260A US9318729B2 US 9318729 B2 US9318729 B2 US 9318729B2 US 201414243260 A US201414243260 A US 201414243260A US 9318729 B2 US9318729 B2 US 9318729B2
US14/243,260
US20140302353A1 (en
2013-04-05 Priority to JP2013079595A priority Critical patent/JP6116974B2/en
2013-04-05 Priority to JP2013079596A priority patent/JP6109626B2/en
2013-04-05 Priority to JP2013079594 priority
2013-04-05 Priority to JP2013079596 priority
2013-04-05 Priority to JP2013079594A priority patent/JP6284709B2/en
2013-04-05 Priority to JP2013079595 priority
2014-04-02 Assigned to MAKITA CORPORATION reassignment MAKITA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OGURA, HIRONORI
2014-04-02 Application filed by Makita Corp filed Critical Makita Corp
2014-10-09 Publication of US20140302353A1 publication Critical patent/US20140302353A1/en
2016-04-19 Publication of US9318729B2 publication Critical patent/US9318729B2/en
238000005192 partition Methods 0 claims description 195
229920000642 polymers Polymers 0 claims description 160
239000011347 resins Substances 0 claims description 160
Power tools are known that have a battery pack, which serves as a power supply, mounted to a tool main body (e.g., refer to the page on which the BL1430 appears in the Makita General Catalog published April 2012). Such a power tool battery pack comprises a rechargeable battery that can be attached to and detached from the tool main body. That is, after the power tool battery pack is attached to the tool main body and used, the power tool battery pack is detached from the tool main body and charged by a specialized charger. After charging, the power tool battery pack is once again attached to the tool main body. As used herein, tool main bodies, specialized chargers, and other structures to which a power tool battery pack may be mounted are sometimes referred to as “mounting targets.”
Power tool battery packs generally comprise a case (housing), which also functions as an outer packaging (shell), and a battery main body that is installed inside the case. The battery main body comprises a plurality of rechargeable battery cells and a circuit board that controls the charging and discharging of the plurality of battery cells. The circuit board includes positive and negative connection terminals through which electric current passes when the battery cells are charged and discharged. In addition, the circuit board is provided with signal terminals for transmitting signals to and receiving signals from outside the battery pack—from a mounting target such as the attached tool main body, the attached charger, etc.
Power tools having battery packs as described above are sometimes used outdoors. As such, the power tools and battery packs may get wet—from rain or other sources of water/moisture in the environment in which the power tool is used. There is thus a risk that water may adversely come into contact with the signal terminals. Hypothetically, if (electrically-conductive) water droplets were to undesirably contact the signal terminals, adjacently disposed signal terminals might become electrically connected to one another through the water droplets. Such an unintended connection might be interpreted, erroneously, as the transmission and/or reception of information related to power tool or battery pack operation or control, and this might result in the improper operation of the power tool and/or battery pack. Consequently, it would be desirable to configure a power tool battery pack so that the signal terminals do not become electrically connected to one another and do not transmit and receive erroneous information—even if, for example, the power tool battery pack comes into contact with water or another electrically-conductive liquid.
In order to address this problem, it would be possible to protect signal terminals by coating them with, for example, a low temperature, low pressure type molding resin, sometimes called “hot melt molding” However, merely coating the signal terminals with such a low temperature, low pressure type molding resin has been criticized as being insufficient to protect the signal terminals
In a first aspect of the disclosure, a power tool battery pack comprises: a lower side case, an upper side case fixed to the lower side case, a battery cell housed in the lower side case, a circuit board connected to the battery cell, and a first terminal and a second terminal disposed on and connected to the circuit board. A slit, which penetrates (passes through) through the circuit board, is provided in the circuit board between the first terminal and the second terminal. The terms “first terminal” and “second terminal” refer to any two signal terminals on the circuit board, e.g., which are disposed parallel to one another.
A power tool battery pack according to a tenth aspect of the disclosure comprises: a lower side case, an upper side case fixed to the lower side case, a battery cell housed in the lower side case, a circuit board connected to the battery cell, a positive electrode terminal and a negative electrode terminal connected to the circuit board, and a plurality of signal terminals arrayed (arranged) in parallel on and connected to the circuit board and disposed between the positive electrode terminal and the negative electrode terminal. The positive electrode terminal, the negative electrode terminal, and the plurality of signal terminals are formed as terminals that sandwich, from both sides, counterpart (corresponding and/or complementary) side terminals and thereby provide electrical connection to the counterpart side terminals from (on) both sides. Furthermore, the “counterpart side” is one example of the mounting target to which the power tool battery pack is mounted. In addition, the counterpart side terminal is a terminal that is provided on the mounting target side that is connected to the power tool battery pack when the power tool battery pack is mounted to the mounting target.
Furthermore, although not discussed in detail, the abovementioned six signal terminals 51 are arrayed (arranged or disposed) in parallel and spaced apart as much as possible so that they do not electrically connect to one another. In addition, the information transmitted to and received by the abovementioned signal terminals 51 is not limited to the details described above as long as it is suitable information related to the battery pack 10 or the mounting target or the like, and may be, for example, temperature information regarding the battery cells 33 supplied by a thermistor or the like built into the battery pack 10. In short, a plurality, namely, six, of the signal terminals 51 is provided for the purpose of transmitting and receiving information related to various functions and corresponds to a plurality of signal terminals according to the present disclosure. In addition, the abovementioned six signal terminals 51 have differing functional purposes and have a relationship corresponding to a first signal terminal and a second signal terminal according to the present disclosure. In addition, the abovementioned six signal terminals 51 also have a relationship corresponding to a first terminal and a second terminal according to the present disclosure, which are connected in parallel to a circuit board. Namely, the abovementioned six signal terminals 51, which are disposed in parallel, have a relationship corresponding to the second (i.e., signal) terminal according to the present disclosure with respect to the first (i.e., signal) terminal according to the present disclosure, and have a relationship of an “other (i.e., signal) terminal” that differs from a “one (i.e., signal) terminal,” which are disposed parallel to one another.
Next, a battery pack 110A according to a third embodiment, which is a modified example of the battery pack 110 of the abovementioned second embodiment, will be explained, with reference to FIG. 23 through FIG. 30. Furthermore, except for the arrangement and configuration of the partition part 160, the battery pack 110A of the third embodiment is configured substantially the same as the battery pack 110 of the abovementioned second embodiment. The battery pack 110A of the third embodiment differs in the arrangement and configuration of the partition part 160 from the battery pack 110 of the abovementioned second embodiment. Consequently, in the explanation below, emphasis will be given to the arrangement and configuration of a partition part 160A in the battery pack 110A of the third embodiment. Elements of the battery pack 110A of the third embodiment that are configured identically to those in the battery pack 110 of the abovementioned second embodiment are assigned identical reference numerals in the drawings, and explanations thereof are omitted. In addition, the battery pack 110A of the third embodiment achieves substantially the same effects as the battery pack 110 of the abovementioned second embodiment. With regard to constituent elements that differ between the second and third embodiments, the same reference numeral may be assigned to those different elements in the drawings with the letter “A” appended.
Compared with the partition part 160 of the abovementioned second embodiment, the partition part 160A of the third embodiment differs in terms of the support to which it is attached and/or on which it is formed. In the second embodiment, the partition part 160 was formed integrally with the resin coating part 55. The partition part 160A of the third embodiment is formed with or attached to an upper side case 23A. Specifically, in the battery pack 110A of the third embodiment, the partition part 160A is provided inside the upper side case 23A of an outer packaging case 20A. Consequently, the partition part 160 like that of the abovementioned second embodiment is not formed integrally with the resin coating part 55 of the third embodiment. Similarly to the partition part 160, the partition part 160A of the third embodiment functions to space apart (shield or isolate) the parallel six signal terminals 51 from one another. However, the partition part 160A of the third embodiment spaces apart the six signal terminals 51 to the left and the right. Consequently, as shown in FIG. 28, the partition part 160A of the third embodiment is provided with five structures referred to as “flat plate shaped two-sided partition walls 165A” which project downward from the top of the upper side case 23A such that the two-sided partition walls 165A form compartments (partitions) in the upper side case 23A. Furthermore, the partition part 160A of the third embodiment does not include a structure that corresponds to the front side partition part 163 or the rear side partition part 167 of the partition part 160 of the first embodiment. In addition, a resin coating part 55A of the third embodiment is formed across the entire upper surface of the circuit board 42. In other words, the connection locations 35 of the lead plates 34, which were explained in the abovementioned first embodiment, are not exposed on the upper side and are covered by the resin coating part 55A.
Next, a battery pack 110B of a fourth embodiment, which is a modified example of the battery packs 110, 110A according to the abovementioned second and third embodiments, will be explained, with reference to FIG. 31. Other than the arrangement and configuration of resin coating parts 55B and a partition part 160B, the battery pack 110B of the fourth embodiment is configured substantially the same as the battery pack 110 of the abovementioned second embodiment. Therefore, in the fourth embodiment, the resin coating parts 55B shown in FIG. 31 will be explained. The oblique view in FIG. 31 shows the configuration of an upper surface of the circuit board 42 of the fourth embodiment. The explanation below emphasizes the arrangement and configuration of the resin coating parts 55B and the partition part 160B in the battery pack 110B of the fourth embodiment. Consequently, elements of the battery pack 110B of the fourth embodiment that are configured identically to those in the battery pack 110 of the abovementioned second embodiment are assigned identical reference numbers in the drawings, and explanations thereof are omitted. In addition, the battery pack 110B of the fourth embodiment achieves substantially the same effects as the battery pack 110 of the abovementioned second embodiment; constituent elements that differ therefrom are identified by the same reference numerals in the drawings with the letter “B” appended.
One area of the upper surface of the circuit board 42 that is provided with one of the resin coating parts 55B is defined as a right side contact area 137. The right side contact area 137 is an area of the upper surface of the circuit board 42 that is on the right side of a virtual line 443 that extends in the front-rear directions from the positive connection terminal 441. The right side contact area 137 lies on the side of the positive connection terminal 441 opposite the negative connection terminal 442 and may be referred to as a “one side area.” Four connection locations 35B of the lead plates 34 are provided on the circuit board 42 in the right side contact area 137. Here, a resin coating part 55B1 (55B) is provided on the upper surface of the circuit board 42 in the right side contact area 137. The resin coating part 55B1 is formed such that a first wall part 571, which extends in the front-rear direction, and a plurality of second wall parts 572, which extend in the left-right directions, are integrated (joined). The first wall part 571 is provided on the upper surface of the circuit board 42 such that it extends in the front-rear directions and spaces apart (separates or shields) the positive connection terminal 441 (i.e., the charging and discharging terminal 44) from the connection locations 35B of the lead plates 34. In addition, the second wall parts 572 are provided on the upper surface of the circuit board 42 such that they extend in the left-right directions and such that they space apart (separate or shield) the connection locations 35B of the four lead plates 34 from one another.
Another area of the upper surface of the circuit board 42 provided with one of the resin coating parts 55B is defined as a left side contact area 138. The left side contact area 138 is an area of the upper surface of the circuit board 42 that is on the left side of a virtual line 444 that extends in the front-rear directions from the negative connection terminal 442. In addition, the left side contact area 138, which may be referred to as an “other side area,” lies on the side of the negative connection terminal 442 opposite from the positive connection terminal 441. Namely, both areas, that is, the one side area and the other side area, are outer side areas with respect to the charging and discharging terminals 44 (441, 442). Four of the connection locations 35B of the lead plates 34 are provided on the circuit board 42 in the left side contact area 138. Here, a resin coating part 55B2 (55B) is provided on the upper surface of the circuit board 42 in the left side contact area 138. The resin coating part 55B2, is also formed such that the first wall part 571, which extends in the front-rear directions, and the second wall parts 572, which extend in the left-right directions, are integrated (joined). The first wall part 571, is also provided on the upper surface of the circuit board 42 such that it extends in the front-rear directions and spaces apart (separates or shields) the negative connection terminal 442 (i.e., the charging and discharging terminal 44) from the connection locations 35B of the lead plates 34, which are disposed adjacent to the negative connection terminal 442. In addition, the second wall parts 572 are also provided on the upper surface of the circuit board 42 such that they extend in the left-right directions and space apart (separate or shield) the connection locations 35B of the four lead plates 34.
The six parallel signal terminals 51 have a relationship corresponding to the second (i.e., signal) terminal according to the present disclosure with respect to the first (i.e., signal) terminal according to the present disclosure, and have a relationship of an “other (i.e., signal) terminal” that differs from a “one (i.e., signal) terminal,” which are arrayed (arranged) parallel to one another. In addition, these six signal terminals 51 (511-516) also are configured as a first connection part and a second connection part that are capable of connecting with terminals of the specialized charger that performs charging.
Incidentally, the resin support body 260A of the connector 250A of the sixth embodiment may be configured in substantially the same manner as the resin support body 260 of the connector 250 of the abovementioned fifth embodiment. As shown in FIG. 46 and FIG. 47, a resin support body 260A′ of a connector 250A′ is configured in substantially the same manner as the resin support body 260 of the abovementioned fifth embodiment. Specifically, in the resin support body 260N, the top plate part 365 is provided at the abovementioned terminal support part 363. Furthermore, signal terminals 251A′, which are mounted to the connector 250N, are formed as signal terminals that are identical to the signal terminals 251A mounted to the connector 250A of the abovementioned sixth embodiment.
In comparison with the connector 250A, the connector 250N configured in this manner is provided with the top plate part 365 which makes it possible to reliably protect the upper sides of the signal terminals 251A′ and, furthermore, to prevent water from adversely contacting the signal terminals 251A′.
10, 110, 110A, 110B, 210 Battery pack
20, 20A Outer packaging case
21 Lower side case
22 Female screw hole(s)
23, 23A Upper side case
25 Charging and discharging terminal slits
26 Signal terminal slits
28 Operation status visualization part(s)
29 Lower surface of the upper side case 23
30 Battery main body
31 Battery part
33 Battery cell(s)
34 Lead plates
35, 35B Connection locations
36 Cell holder
43 Resin coating part
44 Charging and discharging terminal(s)
45 Inner side contact terminal
46 Outer side contact terminal
47 Remaining charge display apparatus
48 Display switch
49 Light emitting diode
51 Signal terminal(s)
52 Support part
53 Contact parts
55, 55A, 55B Resin coating part
56, 56A Upper surface of the resin coating part 55, 55A
59, 259A Male signal terminal(s)
60 Terminal isolating (partitioning) structure
61 Isolating slit (gap)
62 Separating slit(s)
63 Front end(s) of the separating slit(s) 62
64 Rear end(s) of the separating slit(s) 62
67 Linking slit
68 Right end of the linking slit 67
69 Left end of the linking slit 67
71 Partition (extension) part
72 Front side partition part
74 Two-sided partition walls
80 Male hook mechanism
81 Hook shaped structure
82 Hook part
83 Operating part
85 Urging spring
90 Connection apparatus body
92 Support pedestal
94 Mount side charging and discharging terminals
96 Mount side signal terminals
97 Side surfaces of the mount side signal terminals 96
98 Upper side end edges of the mount side signal terminals 96
99 Guide positioning surface member
137 Right side contact area
138 Left side contact area
153 Hollow part
155 Planar contact shaped parts
157 End edge contact shaped parts of the signal terminals 51
160, 160A, 160B Partition (extension) part
161 High partition part
162 Low partition part
163 Front side partition part
165 Two-sided partition wall(s)
165A Flat plate shaped two-sided partition walls
166 Lower end surface of two-sided partition walls 165A
167 Rear side partition part
168 Internal contact part
169 Intermediate partition
231 Positioning surface
232 Screw boss(es)
233 Slip-on flange part
241 Slide guide part
242 Slide guide part
245 Hollow parts (slots)
250, 250A Connector
251 Positive terminal slit
251A Signal terminal(s)
251B Signal terminal(s)
252 Negative terminal slit
260, 260A, 260′ Resin support body
261 Slit stepped part
261B Front side wall part
262B Rear side wall part
263B Sidewall part(s)
266B Partition part(s)
268B Pedestal parts
271 Hook opening
272 Operation opening
273 Ventilation port(s)
281 Elastic button
282 Transmissive material
283 Operation notch part
341 First lead plate
342 Second lead plate
343 Third lead plate
344 Fourth lead plate
351 First connection location
352 Second connection location
353 Third connection location
354 Fourth connection location
361 Support seat part
362 Intermediate support part
363 Terminal support part
365 Top plate part
366 Partition parts
367 Outer side partition parts
420 Microcontroller
421 Ventilation opening
422 Screw opening
441 Positive connection terminal
442 Negative connection terminal
443 Virtual line
451 Support part
453 Front contact part
454 Rear contact part
461 Support part
463 Front contact part
511 First signal terminal
512 Second signal terminal
513 Third signal terminal
514 Fourth signal terminal
515 Fifth signal terminal
516 Sixth signal terminal
521 Lower part of the support part 152
522 Upper part of the support part 152
531 Contact linking part
533 Contact part
534 Contact part
551 Extension part of planar contact shaped parts 155
552 Folded part of planar contact shaped parts 155
553 Bent parts of planar contact shaped parts 155
573 Convex bent part(s)
575 Extension part
591 Support part
593, 594 Contact parts
595 Connecting parts
621 First separating slit
622 Second separating slit
623 Third separating slit
624 Fourth separating slit
625 Fifth separating slit
626 Sixth separating slit
627 Seventh separating slit
631-637 Front end(s) of the separating slit(s) 62
641-647 Rear end(s) of the separating slit(s) 62
681 Side surface of the internal contact part 168
731, 751 Upper ends (tips) of the partition part 71
741-747 Two-sided partition walls
752 Lower (base) end of the partition part 71
923, 924 Lead wire outlets
925 Mating recessed part
941, 942 Mount side charging and discharging terminals
961-966 Mount side signal terminals
991 Lower surface of guide positioning surface member
992 Upper surface of guide positioning surface member
1. A power tool battery pack, comprising:
a lower side case;
an upper side case fixed to the lower side case;
at least one battery cell housed in the lower side case;
a circuit board electrically connected to the battery cell;
first and second terminals disposed on and connected to the circuit board; and
a slit extending through the circuit board between the first terminal and the second terminal.
2. The power tool battery pack according to claim 1, wherein:
the slit comprises first and second separating slits connected to, and each extending perpendicular from, a linking slit, such that a cantilevered portion is defined on the circuit board, and
the first terminal is located on the cantilevered portion.
4. The power tool battery pack according to claim 3, further comprising:
a cell holder holding the at least one battery cell and including a partition part that projects through the slit.
5. The power tool battery pack according to claim 4, wherein partition part includes:
a first partition wall extending through the first separating slit,
a second partition wall extending through the second separating slit and
a front side partition part extending through the linking slit.
10. The power tool battery pack according to claim 9, wherein the upper side case includes:
a positioning surface configured to contact a power tool main body, a specialized charger, or another mounting target while attaching the battery pack thereto, and
a slit stepped part formed as a step wall structure between the positioning surface and the respective lower ends of the signal terminal slits, the slit stepped part being a wall that protrudes perpendicularly from the positioning surface.
12. A power tool battery pack, comprising:
a lower side case; an upper side case connectable to the lower side case;
a battery cell housed in the lower side case;
a circuit board connected to the battery cell and having at least a first terminal, a second terminal and a third terminal arranged in a line in a first direction; and
a slit extending through the circuit board, the slit including a slit first portion extending in the first direction adjacent to the first, second and third terminals, a slit second portion extending from the slit first portion and between the first terminal and the second terminal, and a slit third portion extending from the slit first portion and between the second terminal and the third terminal.
14. The power tool battery pack according to claim 13, wherein:
the slit first, second and fourth portions define a first cantilevered portion of the circuit board, the first terminal being located on the first cantilevered portion, and
the slit first, second and third portions define a second cantilevered portion of the circuit board, the second terminal being located on the second cantilevered portion.
17. The power tool battery pack according to claim 16, wherein:
the partition wall has a first wall portion extending through the slit first portion, a second wall portion extending through the slit second portion and a third wall portion extending through the slit third portion, and
the second wall portion extends from the first wall portion and the third wall portion extends from the first wall portion.
19. A power tool battery pack, comprising:
a cell holder holding the at least one battery cell;
a circuit board electrically connected to the at least one battery cell; and
first and second terminals disposed in parallel on and connected to the circuit board; wherein:
the first terminal and the second terminal are respectively supported by and located entirely on first and second cantilevered portions of the circuit board.
20. A power tool battery pack, comprising:
a cell holder holding the battery cell;
a circuit board electrically connected to the battery cell and having at least two terminals on an upper surface of the circuit board, the at least two terminals being parallel and extending in a front-rear direction of the battery pack; and
a partition wall extending perpendicularly from an upper surface of the cell holder in a direction away from at least one battery cell;
wherein the partition wall is disposed at least between the at least two terminals and a front end of the battery pack in the front-rear direction of the battery pack.
US14/243,260 2013-04-05 2014-04-02 Power tool battery pack Active 2034-06-15 US9318729B2 (en)
JP2013079596A JP6109626B2 (en) 2013-04-05 2013-04-05 Battery pack for electric tools
JP2013079594 2013-04-05
JP2013079596 2013-04-05
JP2013079594A JP6284709B2 (en) 2013-04-05 2013-04-05 Battery pack for electric tools
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US20140302353A1 US20140302353A1 (en) 2014-10-09
US9318729B2 true US9318729B2 (en) 2016-04-19
ID=50434072
US14/243,260 Active 2034-06-15 US9318729B2 (en) 2013-04-05 2014-04-02 Power tool battery pack
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EP (1) EP2787560B1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OGURA, HIRONORI;REEL/FRAME:032583/0044