JP2019186001A - Bus bar module, battery module, battery pack, and battery cell connection method - Google Patents

Abstract

To provide a bus bar module and a battery cell connection method capable of simplifying electrical connection between battery cells and making it difficult for battery cells to deteriorate, and also provide a battery module and a battery pack provided with a bus bar module.SOLUTION: A bus bar module 3 is effective for electrical connection of a battery cells 4 when a plurality of battery cells 4 are arranged in N×(N+1) rows. The bus bar module 3 includes a plurality of types of conductive bus bars 13 and an insulating frame 14 that holds the plurality of types of bus bars 13. The plurality of types of bus bars 13 are configured such that the plurality of battery cells 4 can be electrically connected in N parallel (N + 1) series. The bus bar module 3 is adjusted to a state in which the dispersion of the bus bar resistance value are suppressed in the parallel portion of the plurality of battery cells 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bus bar module that electrically connects a plurality of battery cells. Moreover, it is related with a battery module and a battery pack provided with this bus-bar module. The present invention also relates to a battery cell connection method for electrically connecting a plurality of battery cells using a bus bar module.

  The following Patent Document 1 discloses a technique regarding a battery module. The battery module is configured to include a battery cell assembly including a plurality of battery cells and a bus bar module assembled to the battery cell assembly. The battery cell aggregate is formed by arranging a plurality of battery cells in a line. The bus bar module includes a plurality of bus bars that connect a plurality of battery cells in series, and a frame in which holding portions that respectively hold the plurality of bus bars are formed.

JP 2013-109927 A

  In the conventional battery module, since the plurality of battery cells constituting the battery module are arranged in a line in one direction, in order to install the battery module, a relatively large ground is provided in the one direction. Had to secure space. Therefore, the present inventor has considered the following. That is, when twelve battery cells are used, for example, instead of twelve battery cells arranged in a row in one direction, it was considered to arrange 3 × 4 rows and shorten the grounding space as viewed in the one direction.

  It has been found that arranging the battery cells in 3 × 4 rows is effective because the ground space can be shortened in the one direction. However, the electrical connection between the battery cells is complicated, and if the bus bar resistance value varies due to the complexity of the connection, there is a concern that the battery cell may be deteriorated. I also found that there was room for improvement.

  This invention is made | formed in view of an above-described situation, and makes it a subject to provide the bus-bar module which can make deterioration of a battery cell hard to occur, simplifying the electrical connection of battery cells. It is another object of the present invention to provide a battery module and a battery pack including the bus bar module. Another object of the present invention is to provide a battery cell connection method capable of simplifying the electrical connection between battery cells and making the battery cells less likely to deteriorate.

The bus bar module of the present invention according to claim 1, which has been made to solve the above-described problem, is an arrangement of one electrode and the other electrode of the battery cell as a definition of a battery cell assembly including a plurality of battery cells. The direction is the first direction, the direction orthogonal to the first direction is the second direction, and the number of battery cells arranged in the first direction is N (N is an integer of 2 or more), and The number of the battery cells arranged in the second direction is N + 1, and the first to N of the battery cells arranged in the second direction are the one electrode and the other electrode. The electrodes are arranged in the first direction in order, and only the (N + 1) th battery cell arranged in the second direction is the electrode in the first direction in the order of the other electrode and the one electrode. If the definition is such that
The bus bar module includes a conductive bus bar and an insulating frame in which a holding portion as a portion for holding the bus bar is formed,
The bus bar is composed of a plurality of types for electrically connecting the plurality of battery cells in N parallel (N + 1) series,
The plurality of types of bus bars are formed in such a shape that the N + 1th of the battery cells arranged in the second direction have the same bus bar resistance value.

  According to the present invention having such a feature of claim 1, it is possible to provide a bus bar module effective for electrical connection when a plurality of battery cells are arranged in N × (N + 1) rows. By providing this bus bar module, the grounding space can be shortened as compared with the case where a plurality of battery cells are arranged in a line in one direction. Further, according to the present invention, in connecting a plurality of battery cells electrically in N parallel (N + 1) series, the bus bar resistance value is adjusted to a state in which variation is suppressed in the parallel portion of the battery cells. It can be made difficult for some of the battery cells to deteriorate. Therefore, according to the present invention, it is possible to reduce the size and improve the reliability.

According to a second aspect of the present invention, in the bus bar module according to the first aspect, as a definition of the battery cell assembly, a pair of side portions along the first direction in the battery cell assembly is a longitudinal side. And defining the pair of side portions along the second direction in the battery cell assembly to be short side portions,
The plurality of types of bus bars are characterized in that an external connection portion for taking out a power source is formed on two of the bus bars that are close to one of the pair of short side portions.

  According to the present invention having such a feature of claim 2, since the external connection portions are concentrated on one short side portion side of the battery cell assembly, it is possible to easily take out the power.

  According to a third aspect of the present invention, in the bus bar module according to the second aspect, the two external connection parts are formed in a shape protruding from the one short side part, and the one short side It arrange | positions from the center of a side part at the substantially same space | interval.

  According to the present invention having such a feature of claim 3, it is possible not only to make it easy to take out the power, but also to make the power take-out portion compact by bringing the two external connection portions closer to each other. it can.

The battery module of the present invention according to claim 4, which has been made to solve the above problems, comprises a battery cell assembly comprising a plurality of battery cells, and a bus bar module assembled to the battery cell assembly. ,
In the battery cell assembly, the arrangement direction of one electrode and the other electrode of the battery cell is a first direction, a direction orthogonal to the first direction is a second direction, and the first direction is Of the battery cells arranged in the second direction, the number of the battery cells arranged is N (N is an integer of 2 or more), the number of the battery cells arranged in the second direction is N + 1, and The first to Nth electrodes are arranged in the first direction in the order of the one electrode and the other electrode, and only the (N + 1) th of the battery cells arranged in the second direction. Are arranged in the first direction in the order of the other electrode and the one electrode,
4. The bus bar module according to claim 1, wherein the bus bar module electrically connects the plurality of battery cells in N parallel (N + 1) series. 5.

  According to the present invention having such a feature of claim 4, since the bus bar module according to claim 1, 2 or 3 is provided, as compared with the case where a plurality of battery cells are arranged in a line in one direction. A battery module having a short grounding space can be obtained. Moreover, according to this invention, it can be set as the battery module of the stable state in which some battery cells do not deteriorate. Therefore, according to the present invention, it is possible to reduce the size and improve the reliability.

  Moreover, in order to solve the above-mentioned problem, the battery pack according to claim 5 of the present invention includes one or a plurality of battery modules according to claim 4 and a case for housing the one or more battery modules. It is characterized by providing.

  According to the present invention having the feature of claim 5 described above, since the battery module of the present invention according to claim 4 is provided, it is possible to reduce the size and improve the reliability.

Moreover, in order to solve the above-mentioned problem, the battery cell connection method of the present invention according to claim 6 is the definition of a battery cell assembly composed of a plurality of battery cells. The number of the battery cells arranged in the first direction is N (where N is an integer of 2 or more). And the number of the battery cells arranged in the second direction is N + 1, and the first to N of the battery cells arranged in the second direction are the one electrode and the other. In this order, the electrodes are arranged in the first direction, and only the (N + 1) th battery cell arranged in the second direction is the first electrode in the order of the other electrode. If the definition is such that the electrodes are arranged in one direction,
In electrically connecting the plurality of battery cells in N parallel (N + 1) series, a bus bar module in which a plurality of types of bus bars having conductivity are held in a holding portion of an insulating frame is used.
Among the plurality of types of bus bars, the battery cells arranged in the second direction connected to the (N + 1) th battery cells have the same bus bar resistance value.

  According to the present invention having such a feature of claim 6, it is possible to provide an electrical connection method for battery cells that is effective when a plurality of battery cells are arranged in N × (N + 1) columns. And by providing this connection method, a grounding space can be shortened compared with the case where several battery cells are arranged in a line in one direction. Further, according to the present invention, when electrically connecting a plurality of battery cells in N parallel (N + 1) series, the bus bar resistance value is adjusted to be in a state in which variation is suppressed in the parallel portion of the battery cells. It can be made difficult for some of the battery cells to deteriorate. Therefore, according to the present invention, it is possible to reduce the size and improve the reliability.

  According to the bus bar module and the battery cell connection method of the present invention, it is possible to simplify the electrical connection between the battery cells and to prevent the battery cells from being deteriorated. Moreover, according to the battery module and battery pack of this invention, there exists an effect that a better thing can be provided by providing the bus-bar module of this invention.

It is a figure which shows one Embodiment of this invention, (a) is a top view of a battery module, (b) is a schematic diagram which shows the arrangement | sequence of a some battery cell, (c) is explanatory drawing which concerns on a bus-bar resistance value. is there. It is a perspective view of the battery module of Fig.1 (a). It is a disassembled perspective view of the battery module of FIG. It is an enlarged view of a battery module. It is an enlarged view of a battery module. It is a figure of the 1st bus bar of Drawing 3, and the 2nd bus bar, (a) is a perspective view and (b) is a top view. It is a figure of the 3rd bus bar of FIG. 3, and a 4th bus bar, (a) is a perspective view, (b) is a top view. It is a figure of the flame | frame of FIG. 3, (a) is a perspective view, (b) is a top view. It is a figure of the some battery cell of FIG. 3, (a) is a perspective view, (b) is a top view. It is a figure of the battery module of FIG. 2, (a) is an AA sectional view, (b) is a BB sectional drawing. It is a figure of the battery module of FIG. 2, (a) is CC sectional view taken on the line, (b) is DD sectional view. It is a perspective view of the battery module which shows other one Embodiment of this invention.

  The bus bar module is effective for electrical connection of battery cells when a plurality of battery cells are arranged in N × (N + 1) rows. The bus bar module includes a plurality of types of conductive bus bars and an insulating frame that holds the plurality of types of bus bars. The plurality of types of bus bars are configured so that a plurality of battery cells can be electrically connected in N parallel (N + 1) series. The bus bar module is adjusted to a state in which the bus bar resistance value is less varied in the parallel portion of the plurality of battery cells.

  The battery module includes the bus bar module as described above. The battery pack includes a battery module including a bus bar module. By adopting the bus bar module, a battery cell connecting method, that is, a battery cell connecting method is also employed.

  Embodiment 1 will be described below with reference to the drawings. 1A and 1B are diagrams showing an embodiment of the present invention, in which FIG. 1A is a plan view of a battery module, FIG. 1B is a schematic diagram showing an array of a plurality of battery cells, and FIG. 1C is related to a bus bar resistance value. It is explanatory drawing. 2 is a perspective view of the battery module, FIG. 3 is an exploded perspective view of the battery module, FIG. 4 is an enlarged view of the battery module, FIG. 5 is an enlarged view of the battery module, and FIG. 6 is a view of the first bus bar and the second bus bar. 7 is a diagram of a third bus bar and a fourth bus bar, FIG. 8 is a diagram of a frame, FIG. 9 is a diagram of a plurality of battery cells, and FIGS. 10 and 11 are sectional views of a battery module.

<About the battery module 1, the battery cell assembly 2, the bus bar module 3, etc.>
In FIG. 1A, reference numeral 1 indicates a battery module. The battery module 1 includes a battery cell assembly 2 and a bus bar module 3. Note that a battery pack (not shown) includes one or a plurality of such battery modules 1, a sensor, a controller, and the like, and a case for housing them. The battery pack is mounted on an electric vehicle, a hybrid vehicle, or the like and used as a power supply source (or used as a storage battery for home use or office use). Hereinafter, it will be described as a power supply source for automobiles.

<Regarding Battery Cell Assembly 2 and Battery Cell 4>
In FIG. 1A, FIG. 1B, FIG. 2 and FIG. 3, the battery cell assembly 2 is configured by shortening the grounding space by arranging battery cells 4 in N × (N + 1) rows. In this embodiment, the grounding spaces are arranged in 3 × 4 rows and are shorter than in the case where the ground spaces are arranged in one row in the conventional example.

  The battery cell 4 is, for example, a known lithium ion battery. In this embodiment, the battery cell body 5 is in the shape of a rectangular parallelepiped, and the negative electrode 7 (one electrode) provided on the upper surface 6 of the battery cell body 5. ) And a positive electrode 8 (the other electrode). The upper surface 6 is formed in an elongated rectangular shape whose length in the lateral direction is relatively short with respect to the length in the longitudinal direction. The negative electrode 7 and the positive electrode 8 are disposed and formed in the vicinity of both ends of the upper surface 6 in the longitudinal direction. In this embodiment, the negative electrode 7 and the positive electrode 8 are formed in an oval shape in plan view. Moreover, it forms in the convex shape with low height. The negative electrode 7 and the positive electrode 8 have conductivity, and in the present embodiment, the electrode upper surface (not shown) is used as a connection portion with the bus bar module 3. The negative electrode 7 and the positive electrode 8 are not limited to the electrode shape (terminal shape) in the figure, and may be, for example, a stud bolt or a piece-like portion.

  In FIG. 1B, FIG. 3, and FIG. 9, the battery cell assembly 2 defines itself, and the arrangement direction of the negative electrode 7 and the positive electrode 8 of the battery cell 4 is the first direction P, and this The direction orthogonal to the one direction P is the second direction Q, and the number of battery cells 4 arranged in the first direction P is N (N is an integer of 2 or more, N = 3 in Example 1), and The number of battery cells 4 arranged in the second direction Q is N + 1, and the first to N-th battery cells 4 arranged in the second direction Q are in the order of the negative electrode 7 and the positive electrode 8 in the first direction. In the battery cell 4 arranged in the second direction Q, only the (N + 1) th battery cell is arranged in the first direction P in order of the positive electrode 8 and the negative electrode 7, and the battery cell. The pair of side portions along the first direction P in the assembly 2 become the long side portions 9 and 10, and the battery cell assembly 2 Kicking pair of side along a second direction Q is made the shorter sides 11 and 12.

  In Example 1, the battery cells 4 are arranged in 3 × 4 rows, but may be arranged in 4 × 5 rows as in Example 2 described later (examples of N = 2, N = 5, etc.). Shall be omitted).

<About busbar module 3>
1 to 5, the bus bar module 3 is used for electrical connection of battery cells 4 when a plurality of battery cells 4 are arranged in N × (N + 1) rows (in the first embodiment, 12 pieces are used). Used for electrical connection when the battery cells 4 are arranged in 3 × 4 rows). The bus bar module 3 includes a plurality of types of conductive bus bars 13 and an insulating frame 14 that holds the plurality of types of bus bars 13. The plurality of types of bus bars 13 are configured such that a plurality of battery cells 4 can be electrically connected in N parallel (N + 1) series (in the first embodiment, 12 battery cells 4 are electrically connected to 3 It can be connected in parallel 4 series). The bus bar module 3 is adjusted to a state in which the bus bar resistance value is suppressed in the parallel portion of the plurality of battery cells 4 (in the parallel portion indicated by a two-dot chain line L in FIG. 1C). Can be adjusted to the state with less variation).

<About multiple types of bus bars 13>
In FIG. 3, when the battery bars 4 are arranged in 3 × 4 rows as described above, the bus bar 13 includes a first bus bar 15, two second bus bars 16, a third bus bar 17, and a fourth bus bar 18. It is prepared for. As can be seen from FIG. 3, the bus bar 13 is composed of four types (four types in Example 2 described later). The bus bar 13 is formed by, for example, pressing a conductive metal plate. The first bus bar 15 and the fourth bus bar 18 in the bus bar 13 have external connection portions 19 and 20 for taking out power.

<About the first bus bar 15>
3, 4, and 6, the first bus bar 15 includes the electrode connection portion 21 and the external connection portion 19 and is formed in the illustrated shape. The electrode connection portion 21 is formed at a portion where the three electrodes are connected together. Specifically, it is formed in a rectangular plate-like portion extending in the second direction Q. Moreover, it forms in the part which has three through-holes 22 at equal intervals. In this embodiment, the through hole 22 is formed as a window for confirming connection by welding. When the electrode is a stat bolt, it is formed as a bolt insertion hole.

  The external connection portion 19 in the first bus bar 15 is formed in a portion protruding in a piece from the longitudinal side portion of the electrode connection portion 21. Moreover, the external connection part 19 is also formed in the length which protrudes outside from the short side part 11 of the battery cell assembly 2. The external connection portions 19 are concentrated (concentrated) on the side where the short side portion 11 is located together with the external connection portion 20 of the fourth bus bar 18 described later, and are arranged at substantially the same interval from the center of the short side portion 11. Are arranged as follows.

<About the second bus bar 16>
3, 4, and 6, the second bus bar 16 has a pair of electrode connection portions 23 and a connection portion 24 that connects the pair of electrode connection portions 23 and is formed in the illustrated shape. The electrode connection part 23 is formed in the same part as the electrode connection part 21 of the first bus bar 15. That is, it is formed at a portion where the three electrodes are connected together. Specifically, it is formed in a rectangular plate-like portion extending in the second direction Q. Moreover, it forms in the part which has three through-holes 25 at equal intervals. The through hole 25 is formed as a window for confirming connection by welding, like the through hole 22 of the first bus bar 15.

<About the third bus bar 17>
3 to 5 and FIG. 7, the third bus bar 17 has a long electrode connection portion 26, two short electrode connection portions 27 and 28, and a long connection portion 29 that connects them. It is formed into a shape. The long electrode connection portion 26 is formed at a portion where the four electrodes are connected together. Specifically, it is formed in a rectangular plate-like portion extending in the second direction Q. Moreover, it forms in the part which has four through-holes 30 at equal intervals. In the present embodiment, the through hole 30 is formed as a window for confirming connection by welding. Each of the short electrode connecting portions 27 and 28 is formed at a portion where one electrode is connected. Specifically, it is formed in a substantially square plate-like portion. Further, it is formed in a portion having one through hole 31. In this embodiment, the through hole 31 is formed as a window for confirming connection by welding. The long connecting portion 29 is formed to have a length that is slightly shorter than the length of the longitudinal side portion 10 of the battery cell assembly 2. In the present embodiment, the long connecting portion 29 is formed in the shape of a long and straight strip. The long connecting portion 29 is disposed on the side where the long side portion 10 is located. The long electrode connecting portion 26 and the two short electrode connecting portions 27 and 28 are connected to a predetermined position (position corresponding to the electrode) of the long connecting portion 29. The connecting portion is formed such that the long electrode connecting portion 26 and the two short electrode connecting portions 27 and 28 are bent 90 degrees, respectively.

<About the fourth bus bar 18>
3 to 5 and 7, the fourth bus bar 18 includes three short electrode connecting portions 32, 33, 34 and a long connecting portion 35 that connects these three short electrode connecting portions 32, 33, 34. Are formed in the shape shown in the figure. Three short electrode connection parts 32, 33, and 34 are formed in the part which connects one electrode, respectively. Specifically, it is formed in a substantially square plate-like portion. Further, it is formed in a portion having one through hole 36. In this embodiment, the through hole 36 is formed as a window for confirming connection by welding. The short electrode connection part 32 has the external connection part 20. The external connection part 20 in the fourth bus bar 15 is formed in a part protruding in a piece shape from the side part of the short electrode connection part 32 (partially has a part having a crank shape). The external connection portion 20 is formed to have a length that protrudes outward from the short side portion 11 of the battery cell assembly 2. The external connection parts 20 are concentrated (concentrated) on the side of the short side part 11 together with the external connection part 19 in the first bus bar 15, and are arranged at substantially the same interval from the center of the short side part 11. Be placed.

  The long connecting portion 35 is formed to have a length that is shorter than the long connecting portion 29 of the third bus bar 17. In the present embodiment, the long connecting portion 35 is formed in the shape of a long and straight strip. The long connecting portion 35 is disposed on the long side portion 10 of the battery cell assembly 2 in the same manner as the long connecting portion 29 of the third bus bar 17. Three connecting portions 50 bent at 90 degrees are formed at predetermined positions (positions corresponding to the electrodes) of the long connecting portion 35. In addition, the three short electrode connecting portions 32, 33, and 34 are connected via the connecting portion 50 (in this embodiment, the three connecting portions 50 and the three short electrode connecting portions 32, 33, and 34 are separated from each other). Body, connected by welding, but not limited to this).

<Bus bar resistance value>
The bus bar resistance value will be described with reference to FIGS. 1 and 8. The bus bar resistance value between the external connection portion 20 and the short electrode connection portion 32 of the fourth bus bar 18 is R1, the bus bar resistance value between the external connection portion 20 and the short electrode connection portion 33 is R2, and also the external connection portion. The bus bar resistance value between the 20 and the short electrode connecting portion 34 is R3, and the bus bar resistance between the third connecting portion and the fourth connecting portion in the long electrode connecting portion 26 of the third bus bar 17 If the value is R4, the bus bar resistance value between the long electrode connecting portion 26 and the short electrode connecting portion 28 is R5, and the bus bar resistance value between the long electrode connecting portion 26 and the short electrode connecting portion 27 is R6, the bus bar With respect to the resistance value, R1 + R6≈R2 + R5≈R3 + R4 is obtained (the bus bar 13 is composed of a plurality of types so as to have such a bus bar resistance value). Therefore, it can be said that the bus bar resistance value is adjusted to a state in which variation is suppressed in the parallel portion indicated by a two-dot chain line L in FIG.

  If a bus bar configuration from the first bus bar 15 to the fourth bus bar 18 is adopted, even if twelve battery cells 4 are arranged in 3 × 4 rows, it is difficult for some of the battery cells 4 to deteriorate. (In other words, if the connection method according to the battery cell 4 described in the present embodiment is employed, even if the 12 battery cells 4 are arranged in 3 × 4 rows, some of the battery cells 4 may be Can be less likely to deteriorate).

<About frame 14>
2 to 5 and 8, the frame 14 is a resin molded product made of an insulating resin material and is formed so as to hold a plurality of types of bus bars 13 as described above. Specifically, it has a plurality of holding portions 37 to 46 and is formed in the illustrated shape.

  Reference numeral 47 in the frame 14 indicates a frame side portion. Reference numeral 48 in the holding portions 37 to 46 indicates a through hole. The through hole 48 is formed in a shape penetrating in accordance with the electrode size (see FIGS. 10 and 11). The holding portions 37 to 46 are not particularly designated, but are formed in the illustrated shape by a bottom wall having a through hole 48 and a frame-like side wall standing on the bottom wall.

  The first holding portion 37 is formed in a portion that accommodates and holds the first bus bar 15. The holding portion 37 is also formed in a portion where the external connection portion 19 can be pulled out. Two second holding portions 38 are formed. The two holding portions 38 are formed in portions for receiving and holding the two second bus bars 16 respectively. The third holding portion 39 is formed in a portion that accommodates and holds the long electrode connection portion 26 in the third bus bar 17. The fourth and fifth holding portions 40 and 41 are formed in portions for receiving and holding the two short electrode connection portions 27 and 28, respectively. Each of the holding portions 40 and 41 is formed to be continuous with the holding portion 38. The sixth holding portion 42 is formed in a portion that accommodates and holds the long connecting portion 29 in the third bus bar 17. The holding portion 42 is disposed on the longitudinal side portion 10 of the battery cell assembly 2.

  The seventh holding portion 43 is formed in a portion that accommodates and holds the short electrode connecting portion 32 in the fourth bus bar 18. The holding portion 43 is formed so as to be continuous with the holding portion 37. The holding portion 43 is also formed in a portion where the external connection portion 20 can be pulled out. The eighth holding portion 44 is formed in a portion that accommodates and holds the short electrode connection portion 33 in the fourth bus bar 18. The holding portion 44 is formed so as to be continuous with the holding portion 38. The ninth holding portion 45 is formed in a portion that accommodates and holds the short electrode connecting portion 34 in the fourth bus bar 18. The holding portion 45 is formed to be continuous with the holding portion 38. The tenth holding portion 46 is formed in a portion that accommodates and holds the long connecting portion 35 in the fourth bus bar 18. The holding portion 46 is disposed outside the holding portion 42 in the longitudinal side portion 10 of the battery cell assembly 2.

  The holding part 42, the holding part 46, and the frame side part 47 are arranged in the second direction Q with an interval corresponding to four battery cells 4. In addition, the holding unit 37 and the holding unit 43, the holding unit 38 and the holding unit 40 and the holding unit 44, the holding unit 38 and the holding unit 41 and the holding unit 45, and the holding unit 48 include the holding unit 42 and the holding unit 46, and the frame. It is arranged in a substantially bridge shape with the side portion 47. The quoted part number 49 indicates an opening that opens to expose the upper surface 6 of the battery cell body 5.

<Assembly of bus bar module 3 and battery module 1>
2 to 6, the bus bar module 3 is fitted with the corresponding first bus bar 15, two second bus bars 16, the third bus bar 17, and the fourth bus bar 18 in the holding portions 37 to 46 of the frame 14. This completes the assembly. Thereafter, when the bus bar module 3 is welded to the battery cell assembly 2, the assembly of the battery module 1 is completed.

<About the effects of the busbar module 3 etc.>
As described above with reference to FIGS. 1 to 11, according to the bus bar module 3 according to one embodiment of the present invention, when a plurality of battery cells 4 are arranged in N × (N + 1) rows. Effective for electrical connection. By providing the bus bar module 3, the grounding space can be shortened as compared with the conventional example in which a plurality of battery cells 4 are arranged in a line in one direction. Further, according to the bus bar module 3, when electrically connecting a plurality of battery cells 4 in N parallel (N + 1) series, the bus bar resistance value is adjusted to a state in which variation is suppressed in the parallel portion of the battery cells 4. As a result, it can be made difficult for some of the battery cells 4 to deteriorate. Therefore, according to the bus bar module 3, it is possible to reduce the size and improve the reliability.

  Moreover, according to the bus bar module 3, since the external connection parts 19 and 20 are concentrated on the short side part 11 side in the battery cell assembly 2, it is possible to easily take out the power. Further, as shown in the present embodiment, since the external connection portions 19 and 20 are arranged at the same distance from the center of the short side portion 11 and close to each other, the power supply extraction portion in the battery module 1 is made compact. You can also.

  In addition, according to the battery module 1 which is one embodiment of the present invention, since the bus bar module 3 is provided, the ground space is reduced as compared with the conventional example in which a plurality of battery cells 4 are arranged in a line in one direction. Can be shortened. Moreover, according to the battery module 1, it can be set as the thing of the stable state in which some battery cells 4 do not deteriorate. Therefore, according to the battery module 1, it is possible to reduce the size and improve the reliability (a battery pack (not shown) can also be reduced in size and improved in reliability).

  In addition, according to the battery cell connection method employed by using the bus bar module 3, an electrical connection method to the battery cell 4 that is effective when a plurality of battery cells 4 are arranged in N × (N + 1) rows is provided. Can be provided. By providing this connection method, the grounding space can be shortened as compared with the conventional example in which a plurality of battery cells 4 are arranged in a line in one direction. Further, according to the battery cell connection method, when the plurality of battery cells 4 are electrically connected in N parallel (N + 1) series, in the parallel portion of the battery cells 4, the bus bar resistance value is in a state in which variation is suppressed. As a result, it is possible to prevent a part of the battery cells 4 from being deteriorated. Therefore, according to the battery cell connection method, it is possible to reduce the size and improve the reliability.

  Embodiment 2 will be described below with reference to the drawings. FIG. 12 is a perspective view of a battery module showing another embodiment of the present invention. In addition, since Example 2 employs basically the same constituent members as in Example 1, detailed description thereof is omitted here.

<Battery Module 51, Battery Cell Assembly 52, Bus Bar Module 53, etc.>
In FIG. 12, reference numeral 51 indicates a battery module. The battery module 51 includes a battery cell assembly 52 and a bus bar module 53. The battery cell aggregate 52 is obtained by arranging the battery cells 4 described in the first embodiment in N × (N + 1) columns. Specifically, N is set to N = 4 and arranged in 4 × 5 columns. The bus bar module 53 is used for electrical connection of the battery cells 4 when 20 battery cells 4 are arranged in 4 × 5 rows. The bus bar module 53 includes a plurality of types of conductive bus bars 54 and an insulating frame 55 that holds the plurality of types of bus bars 54. The plurality of types of bus bars 54 are configured such that 20 battery cells 4 can be electrically connected in 4 parallel 5 series. In the parallel portion of the 20 battery cells 4, the bus bar module 53 is adjusted to a state in which the bus bar resistance value suppresses variations. The plurality of types of bus bars 54 includes a first bus bar 56, three second bus bars 57, a third bus bar 58, and a fourth bus bar 59.

<About the effects of the bus bar module 53>
The effects of the bus bar module 3 and the like of the second embodiment are the same as those of the first embodiment, and are omitted here.

  In addition, the present invention can of course be modified in various ways within the scope not changing the gist of the present invention.

  P ... First direction, Q ... Second direction, 1 ... Battery module, 2 ... Battery cell assembly, 3 ... Busbar module, 4 ... Battery cell, 5 ... Battery cell body, 6 ... Top surface, 7 ... Negative electrode (one Electrode), 8 ... positive electrode (the other electrode), 9, 10 ... long side part, 11, 12 ... short side part, 13 ... bus bar, 14 ... frame, 15 ... first bus bar, 16 ... second bus bar, 17 ... 3rd bus bar, 18 ... 4th bus bar, 19, 20 ... External connection part, 21 ... Electrode connection part, 22 ... Through hole, 23 ... Electrode connection part, 24 ... Connection part, 25 ... Through hole, 26 ... Long electrode Connection part, 27, 28 ... Short electrode connection part, 29 ... Long connection part, 30, 31 ... Through hole, 32, 33, 34 ... Short electrode connection part, 35 ... Long connection part, 36 ... Through hole, 37 ~ 46 ... Holding part, 47 ... Flare Side part 48 ... through hole 49 ... opening part 50 ... connecting part 51 ... battery module 52 ... battery cell assembly 53 ... bus bar module 54 ... bus bar 55 ... frame 56 ... first bus bar 57 ... second bus bar, 58 ... third bus bar, 59 ... fourth bus bar

Claims (6)

As a definition of a battery cell assembly composed of a plurality of battery cells, the arrangement direction of one electrode and the other electrode of the battery cell is the first direction, and the direction orthogonal to the first direction is the second direction. And the number of the battery cells arranged in the first direction is N (N is an integer of 2 or more), the number of the battery cells arranged in the second direction is N + 1, and the second Among the battery cells arranged in the direction, the first to Nth cells are arranged in the first direction in the order of the one electrode and the other electrode, and are arranged in the second direction. When only N + 1 of the battery cells are defined so that the electrodes are arranged in the first direction in the order of the other electrode and the one electrode,
The bus bar module includes a conductive bus bar and an insulating frame in which a holding portion as a portion for holding the bus bar is formed,
The bus bar is composed of a plurality of types for electrically connecting the plurality of battery cells in N parallel (N + 1) series,
The bus bar module, wherein the plurality of types of bus bars are formed in such a shape that the N + 1-th connected battery cells arranged in the second direction have the same bus bar resistance value. The busbar module according to claim 1, wherein
As a definition of the battery cell assembly, a pair of side portions along the first direction in the battery cell assembly is a longitudinal side portion, and a pair of sides along the second direction in the battery cell assembly. If you define the part to be the short side,
The bus bar module, wherein the plurality of types of bus bars are formed with external connection portions for taking out a power source in two of them, which are close to one of the pair of short side portions. The bus bar module according to claim 2,
The bus bar module, wherein the two external connection portions are formed in a shape protruding from the one short side portion, and are arranged at substantially the same interval from the center of the one short side portion. A battery cell assembly comprising a plurality of battery cells, and a bus bar module assembled to the battery cell assembly,
In the battery cell assembly, the arrangement direction of one electrode and the other electrode of the battery cell is a first direction, a direction orthogonal to the first direction is a second direction, and the first direction is Of the battery cells arranged in the second direction, the number of the battery cells arranged is N (N is an integer of 2 or more), the number of the battery cells arranged in the second direction is N + 1, and The first to Nth electrodes are arranged in the first direction in the order of the one electrode and the other electrode, and only the (N + 1) th of the battery cells arranged in the second direction. Are arranged in the first direction in the order of the other electrode and the one electrode,
The battery module according to claim 1, wherein the bus bar module is a bus bar module according to claim 1, for electrically connecting the plurality of battery cells in N parallel (N + 1) series. A battery pack comprising one or a plurality of the battery modules according to claim 4 and a case for housing the one or a plurality of battery modules. As a definition of a battery cell assembly composed of a plurality of battery cells, the arrangement direction of one electrode and the other electrode of the battery cell is the first direction, and the direction orthogonal to the first direction is the second direction. And the number of the battery cells arranged in the first direction is N (N is an integer of 2 or more), the number of the battery cells arranged in the second direction is N + 1, and the second Among the battery cells arranged in the direction, the first to Nth cells are arranged in the first direction in the order of the one electrode and the other electrode, and are arranged in the second direction. When only N + 1 of the battery cells are defined so that the electrodes are arranged in the first direction in the order of the other electrode and the one electrode,
In electrically connecting the plurality of battery cells in N parallel (N + 1) series, a bus bar module in which a plurality of types of bus bars having conductivity are held in a holding portion of an insulating frame is used.
Among the plurality of types of bus bars, among the battery cells arranged in the second direction, those connected to the (N + 1) th battery cells have the same bus bar resistance value.

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