JP6134209B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack in which a plurality of battery cells are conductively connected.

Battery packs and assembled batteries used as power sources for electric vehicles and hybrid vehicles are required to have high output in a limited space. In addition to cylindrical battery cells, prismatic batteries that are easy to arrange in high density are used. Is done.
In order to electrically connect such battery cells in series or in parallel, a connecting member such as a bus bar is used (for example, see Patent Document 1). The bus bar is screwed to the electrode terminal of each battery cell. However, since the bus bar is an individual member, the number and size of the bus bars to be used increase and the cost increases when the number of connections increases. In particular, in order to meet the demand for higher output in recent years, the number of battery cells used tends to increase. Therefore, the cost of the bus bar cannot be ignored in connection with the bus bar. Moreover, since contact resistance arises in the connection part of the electrode terminal of each battery cell and a bus bar, when the number of use of a bus bar increases, contact resistance will also increase.

Therefore, a battery pack that can connect adjacent battery cells without using a bus bar has been proposed (see Patent Document 2).
As shown in FIG. 7, the battery pack 501 is a battery pack in which a plurality of battery cells 503 are adjacent to each other and connected in series and / or in parallel. The battery pack 501 has a battery cell 503 in which the positive and negative electrode terminals 505 protrude from one end surface, and a plurality of battery cells 503 arranged in a state where the end surface provided with the electrode terminals 505 is aligned on the substantially same plane. A fixture 507 for connecting the electrode terminals of adjacent battery cells 503 in a fixed state. The electrode terminal 505 is formed in a plate shape, and has a bent surface 509 that is bent at the tip protruding upward from the end surface of the battery cell 503. The electrode terminal 505 is connected in a fixed state by a fixing tool 507 with the folding surfaces 509 in adjacent battery cells 503 in contact with each other in a superimposed state.

In addition, the battery pack 501 is fixed by being covered with an end plate 513 with the end surfaces thereof being connected so that the separators 511 and the battery cells 503 are alternately stacked. A pair of screw holes 515 project from the side surfaces of the end plate 513, and an extension bolt 517 extending to the side surface of the battery pack 501 in which the battery cells 503 are stacked is passed through the screw holes 515 to fasten the end plates 513 together. It is fixed by.
According to this battery pack 501, adjacent battery cells 503 can be connected without using a bus bar.

JP-A-5-343105 JP 2008-181765 A

By the way, this type of battery pack 501 is required to increase the number of battery cells 503 used and to have a higher density arrangement in order to meet the recent demand for higher output.
However, since the above-described conventional battery pack 501 has the electrode terminals 505 formed in a plate shape and protrudes upward from the end face of the battery cell 503, the battery cell 503 has a high-density arrangement by making the battery cell 503 multistage in the vertical direction. Have difficulty. In addition, since the battery pack 501 fixes the end plates 513 by fastening through extension bolts 517 extending to the side surfaces, it is difficult to provide the electrode terminals 505 on the side surfaces of the battery cells 503.
In addition, since the folded curved surfaces 509 of adjacent battery cells 503 are brought into contact with each other and the electrode terminals 505 are connected to a fixed state by a fixing tool 507 such as a rivet, bolt, or nut, a component (fixing tool) 507) increase, and a lot of electrical connection work is required after the battery cell 503 is fixed. Further, the battery pack 501 is disadvantageous for miniaturization because an electric connection work space for assembling the fixing tool 507 to the electrode terminal 505 is required.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a battery pack in which a plurality of battery cells can be arranged at a high density and electrical connection work is not required after the battery cells are fixed.

The above object of the present invention is achieved by the following configuration.
(1) A plurality of battery cells, a case having an upper opening for accommodating these battery cells adjacent to each other, and a first edge portion on the side of one adjacent battery cell on the battery cell side surface of the battery cell. A first electrode terminal piece, a second electrode terminal piece projecting from the second edge of the battery cell side surface on the other adjacent battery cell side, and projecting from the inner wall surface of the case, and housed in the case A U-shaped terminal accommodating portion having an upper insertion port into which the first electrode terminal piece and the second electrode terminal piece of adjacent battery cells of the plurality of fixed battery cells are inserted, and A battery pack comprising: a substantially U-shaped conductive clip that is mounted inside the terminal accommodating portion and sandwiches the inserted first electrode terminal piece and the second electrode terminal piece.

According to the battery pack having the configuration (1), the first electrode terminal piece in each battery cell is inserted into one of the two adjacent terminal accommodating portions, and the second electrode terminal piece is adjacent to the two terminal accommodating portions. Inserted into the other. When the battery cells are sequentially inserted into the case, the second electrode terminal piece of the previously inserted battery cell is inserted into one of the two adjacent terminal accommodating portions. Therefore, in the battery cell inserted adjacently later, the first electrode terminal is inserted into the surplus space of the terminal holding space in which the second electrode terminal piece is inserted. Thereby, the 1st electrode terminal piece of the battery cell inserted adjacently later and the 2nd electrode terminal piece of the battery cell inserted previously are pinched | interposed and electrically connected by the electroconductive clip. That is, the electrical connection of the plurality of battery cells accommodated and fixed in the case is completed simultaneously with the insertion into the case.
That is, the plurality of battery cells accommodated and fixed in the case are electrically connected to the first electrode terminal piece and the second electrode terminal piece by the conductive clip at the same time as the insertion into the case. After fixing, the electrical connection work for assembling the fixture for connecting the electrode terminals to each other in a fixed state becomes unnecessary, and the connection work space becomes unnecessary.

(2) In the battery pack having the configuration of (1) above, the terminal accommodating portions are arranged in a plurality of stages apart from each other in the vertical direction of the inner wall surface, and the terminal accommodating portions in the respective stages are in other stages. A battery pack, wherein the battery pack is arranged to be offset in a direction adjacent to the battery cell with respect to the terminal accommodating portion.

  According to the battery pack having the configuration (2), the first electrode terminal piece and the second electrode terminal piece do not interfere with the upper terminal accommodating portion when the lower battery cell is inserted. As a result, the lower-stage battery cells can be attached in the downward vertical direction, and the work of attaching the battery cells in a plurality of stages becomes easy.

(3) The battery pack having the configuration of (1) or (2), wherein the conductive clip is formed with a terminal insertion guide surface that gradually expands outward on the clip opening side. Battery pack.

  According to the battery pack having the configuration (3), when the battery cell is inserted into the case, the battery cell is inserted from the upper opening of the case toward the case bottom. At this time, if the first electrode terminal piece or the second electrode terminal piece of the battery cell is displaced from the terminal holding space of the conductive clip, the first electrode terminal piece or the second electrode terminal piece contacts the terminal insertion guide surface. Touch. In the battery cell in which the first electrode terminal piece or the second electrode terminal piece is in contact with the terminal insertion guide surface, the first electrode terminal piece or the second electrode terminal piece is moved along the terminal insertion guide surface. The first electrode terminal piece or the second electrode terminal piece moved along the terminal insertion guide surface is inserted into the terminal holding space, and at the same time, the battery cell is predetermined via the first electrode terminal piece or the second electrode terminal piece. It is arranged at the position. As a result, the battery cell is corrected for misalignment during insertion, can be smoothly inserted into the terminal, and good workability can be obtained. Further, positioning of the subsequent battery cell fixing work can be completed at the same time.

  According to the battery pack of the present invention, a plurality of battery cells can be arranged at high density, and the electrical connection work after fixing the battery cells can be made unnecessary.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

It is the whole perspective view which fractured a part of battery pack concerning one embodiment of the present invention. It is an expansion perspective view of the A section in FIG. It is a disassembled perspective view of the adjacent battery cell in the battery pack shown in FIG. It is a principal part disassembled perspective view for demonstrating the terminal accommodating part and conductive clip in the inner wall face of the case shown in FIG. It is a principal part perspective view for demonstrating the case attachment work example of the battery cell shown in FIG. (A) And (b) is a principal part perspective view for demonstrating the battery pack which concerns on the comparative example of this invention. It is a whole perspective view of the conventional battery pack.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a battery pack 11 according to an embodiment of the present invention includes a plurality of battery cells 27, a case 13 for housing these battery cells 27, and a first protruding from each battery cell 27. It has the 1 electrode terminal piece 15 and the 2nd electrode terminal piece 17, the terminal accommodating part 19 protrudingly provided by the inner wall surface 53 of case 13, and the electroconductive clip 21 with which the terminal accommodating part 19 was mounted | worn.

The case 13 is made of, for example, a synthetic resin material and is formed in a rectangular parallelepiped box shape. The case 13 has an upper opening 23 that opens at least upward. The upper opening 23 is covered with the lid 14. The inside of the case 13 that leads to the upper opening 23 is a battery cell housing space 25. A plurality of battery cells 27 are accommodated adjacent to each other in the battery cell accommodating space 25.
As shown in FIG. 1, a plurality (eight in the illustrated example) of the battery cells 27 are arranged in a horizontal direction and arranged in multiple stages (two in the illustrated example) in the vertical direction. In the present embodiment, each battery cell 27 is formed in a substantially rectangular parallelepiped shape having a small lateral width W (see FIG. 3). The plurality of battery cells 27 are housed apart with a predetermined gap d (see FIG. 2) such that the longitudinal direction of the case 13 (the left-right direction in FIG. 1) is the width W direction.

The bottom plate 29 of the case 13 is provided with a plurality of fixed blocks 31a and 31b protruding upward. The fixed blocks 31 a and 31 b are arranged in two rows along the longitudinal direction of the case 13 on the near side and the far side. The fixed block 31a on the front side in the figure uses a pair of fixed blocks 31a for one battery cell 27, and the fixed block 31b on the back side in the figure has one fixed block 31b for one battery cell 27. Is used. That is, a plurality of pairs of fixed blocks 31 a corresponding to the battery cells 27 are arranged on the front fixed block 31 a in the drawing. Female screw holes 33 are opened on the upper surfaces of the fixing blocks 31a and 31b. A fixing bolt 35 described later is screwed into the female screw hole 33.
In this embodiment, an example in which the bolt insertion block 37 of the battery cell 27 is fastened to the fixing blocks 31a and 31b by the fixing bolt 35 will be described. However, the bolt insertion block 37 and the fixing blocks 31a and 31b are fixed bolts. It may be fixed by fastening means other than 35.

  The battery cell 27 is covered with a substantially rectangular parallelepiped outer can. A lithium ion secondary battery or the like can be used for the battery cell 27. Moreover, it is good also as a primary battery other than a nickel battery. The plurality of battery cells 27 are electrically connected in series. The battery cell 27 is connected to a control circuit (not shown) at the end of the battery pack 11. The control circuit measures the voltage, current, temperature, etc. of each battery cell 27, determines the battery capacity, the required charge / discharge amount, etc., and controls charge / discharge.

In the battery cell 27, a first electrode terminal piece 15 as a negative electrode protrudes from the first edge 41 on the side of one adjacent battery cell on the battery cell side surface 39a. The 1st electrode terminal piece 15 is formed in the strip shape orthogonal to the battery cell side surface 39a.
Further, the battery cell 27 has a second electrode terminal piece 17 that is a positive electrode protruding from the second edge 43 on the other adjacent battery cell side of the battery cell side surface 39a. The second electrode terminal piece 17 is formed in an L-shaped cross section having a side parallel piece 45 extending in a direction parallel to the battery cell side face 39a and a side face vertical piece 47 extending in a direction orthogonal to the battery cell side face 39a. Accordingly, the plurality of battery cells 27 are arranged in the direction of the lateral width W that is the direction in which the battery cells 27 are adjacent to each other, so that the distal end portion of the second electrode terminal piece 17 that is the positive electrode and the first electrode terminal piece that is the negative electrode. The 15 tip portions can be overlapped and electrically connected in series.

  As shown in FIG. 3, a pair of bolt insertion blocks 37 project from the lower portion of the front battery cell side surface 39a, and a single bolt insertion block 37 (see FIG. 3) is provided at the lower portion of the rear battery cell side surface 39b. (Not shown) is projected. The bolt insertion block 37 has a through hole 49 through which the fixing bolt 35 is inserted. The bolt insertion block 37 corresponds to the fixing blocks 31a and 31b provided on the bottom plate 29, respectively. The battery cell 27 mounts a bolt insertion block 37 corresponding to the fixing blocks 31a and 31b of the bottom plate 29, and screws the fixing bolt 35 inserted through the through hole 49 into the female screw hole 33 of the fixing blocks 31a and 31b. The case 13 is fastened and fixed.

  Further, a pair of case-side fixing blocks 51 project from the upper part of the front battery cell side surface 39a, and one case-side fixing block 51 projects from the upper part of the rear battery cell side surface 39b. . The pair of case-side fixing blocks 51 protruding from the battery cell side surface 39a are disposed at the same interval as the bolt insertion block 37, but the direction in which the battery cell 27 is adjacent to the lower bolt insertion block 37 (horizontal width). (Offset in the direction of W). Further, the case-side fixing block 51 protruding from the battery cell side surface 39b is also offset from the lower bolt insertion block 37 in the direction adjacent to the battery cell 27 (direction of the lateral width W).

  Female screw holes 33 are formed on the upper surfaces of the case-side fixing blocks 51. Therefore, the lower battery cell 27 in which the lower bolt insertion block 37 is fixed to the fixing blocks 31a and 31b of the bottom plate 29 is fixed by being inserted into the bolt insertion block 37 provided in the lower part of the battery cell 27 adjacent to the upper stage. The bolt 35 is screwed into the upper case side fixing block 51. Since the case side fixed block 51 is offset in the direction of the lateral width W with respect to the bolt insertion block 37, the tightening tool does not interfere when the bolt insertion block 37 is bolted.

  On the inner wall surface 53 on the near side of the case 13 in the drawing, as shown in FIG. The terminal accommodating portion 19 is formed integrally with the synthetic resin case 13. The terminal accommodating portion 19 is formed in a U shape having an upper insertion port 55. The terminal accommodating portion 19 is disposed at a position corresponding to the first electrode terminal piece 15 between the adjacent battery cells 27 and the side surface vertical piece 47 of the second electrode terminal piece 17. Accordingly, in the terminal accommodating portion 19, the first electrode terminal pieces 15 and the side surface vertical pieces 47 of the adjacent battery cells 27 of the plurality of battery cells 27 accommodated and fixed in the case 13 are inserted inward.

  A substantially U-shaped conductive clip 21 having conductivity is attached to the inside of the terminal accommodating portion 19. The conductive clip 21 is made of, for example, a metal material (phosphor bronze or the like) having a spring property and good conductivity. The conductive clip 21 bent in a substantially U shape forms a terminal clamping space 57 that sandwiches the first electrode terminal piece 15 and the side surface vertical piece 47 inside. Therefore, the first electrode terminal piece 15 and the side surface vertical piece 47 inserted into the conductive clip 21 attached to the terminal accommodating portion 19 are clamped and fixed by the conductive clip 21.

  Further, a terminal insertion guide surface 59 that gradually expands toward the outside (upper side in FIG. 4) is formed on the clip opening side of the conductive clip 21. The terminal insertion guide surface 59 guides the contacted first electrode terminal piece 15 or side surface vertical piece 47 to the terminal holding space 57 when the battery cell 27 is inserted into the case 13.

  The terminal accommodating portions 19 are arranged in a plurality of stages apart from each other in the vertical direction of the inner wall surface 53, and the terminal accommodating portions 19 in the respective stages are adjacent to the terminal accommodating portions 19 in the other stages in the direction in which the battery cells 27 are adjacent. It is arranged with an offset.

Next, the operation of the battery pack 11 having the above configuration will be described.
In the battery pack 11 according to this embodiment, since the first electrode terminal piece 15 and the second electrode terminal piece 17 are provided on the battery cell side surface 39a, the electrode terminal 505 protrudes upward from the battery cell 503 (FIG. 7). Compared to the reference), the battery cell 27 can be easily multistaged in the vertical direction. Thereby, the high-density arrangement | positioning of the some battery cell 27 is attained.

  As shown in FIG. 5, when the battery cell 27 is inserted into the case 13, the first electrode terminal piece 15 in each battery cell 27 is inserted into one of the two adjacent terminal accommodating portions 19, and the second electrode The side surface vertical piece 47 of the terminal piece 17 is inserted into the other of the two adjacent terminal accommodating portions 19. When the battery cells 27 are sequentially inserted into the case 13, the side vertical piece 47 of the second electrode terminal piece 17 in the battery cell 27 previously inserted is inserted into one of the two adjacent terminal accommodating portions 19. Yes.

  Accordingly, the battery cell 27 inserted adjacently later is placed in the surplus space of the terminal holding space 57 (see FIG. 1) in which the side surface vertical piece 47 of the second electrode terminal piece 17 is inserted, and the first electrode terminal piece 15. Is inserted. This surplus space is set slightly narrower than the thickness of the first electrode terminal piece 15. Thus, the first electrode terminal piece 15 of the battery cell 27 inserted adjacently later and the side surface vertical piece 47 of the second electrode terminal piece 17 of the battery cell 27 inserted earlier are electrically conductive. It is clamped by the clip 21 and is electrically connected.

  At this time, the battery cells 27 inserted adjacently later are simultaneously restricted to a predetermined fixed position via the first electrode terminal piece 15. That is, the electrical connection and positioning of the plurality of battery cells 27 accommodated and fixed in the case 13 are completed simultaneously with the insertion into the case 13.

  That is, since the plurality of battery cells 27 accommodated and fixed in the case 13 are electrically connected to the first electrode terminal piece 15 and the second electrode terminal piece 17 by the conductive clip 21 simultaneously with the insertion into the case 13, FIG. As in the conventional structure shown in FIG. 1, after the battery cell 503 is fixed, the electrical connection work for assembling the fixture 507 for connecting the electrode terminals to each other in a fixed state is unnecessary, and the connection work space is also unnecessary. Thereby, compared with the conventional structure, the battery pack 11 can be made compact.

Next, the operation of the battery pack 11 according to this embodiment will be clarified with reference to the battery cells 27A and 27B of the battery pack according to the comparative example shown in FIGS. 6 (a) and 6 (b). In addition, about the structural member similar to the battery cell 27 of the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
In the battery cell 27A shown in FIG. 6A, a first electrode terminal piece 17A, which is a negative electrode, protrudes from the first edge 41 on the side of one adjacent battery cell on the battery cell side surface 39a. The first electrode terminal piece 17A is formed in an L-shaped cross section having a side parallel piece 45A extending in a direction parallel to the battery cell side face 39a and a side face vertical piece 47A extending in a direction orthogonal to the battery cell side face 39a.
The battery cell 27A has a second electrode terminal piece 15A as a positive electrode protruding from the second edge 43 on the other adjacent battery cell side of the battery cell side surface 39a. The second electrode terminal piece 15A is formed in a strip shape orthogonal to the battery cell side surface 39a.
The connecting bolt 61 is inserted into the through hole 48 formed in the first electrode terminal piece 17A and the second electrode terminal piece 15A and screwed into the nut 62, so that the first electrode terminal piece 15A and the first electrode terminal piece 15A are connected to the first electrode terminal piece 15A. The electrode terminal piece 17A is electrically connected.

Also with such a battery cell 27A, the first electrode terminal piece 17A and the second electrode terminal piece 15A are provided on the battery cell side surface 39a, so that the electrode terminal 505 protrudes upward from the battery cell 503 (see FIG. 7). ), The battery cell 27A can be easily multistaged in the vertical direction. Thereby, the high-density arrangement of the plurality of battery cells 27A becomes possible.
However, after these battery cells 27A are fixed to a case (not shown), it is necessary to perform electrical connection work for assembling the connecting bolt 61 and the nut 62 that connect the second electrode terminal piece 15A and the first electrode terminal piece 17A in a fixed state. Since a connection work space is also required, the case becomes large.

In the battery cell 27B shown in FIG. 6B, a first electrode terminal piece 17B, which is a negative electrode, projects from the first edge 41 on the side of one adjacent battery cell on the battery cell side surface 39a. The first electrode terminal piece 17B is formed in an L-shaped cross section having a side parallel piece 45B extending in a direction parallel to the battery cell side face 39a and a side face vertical piece 47B extending in a direction orthogonal to the battery cell side face 39a.
The battery cell 27B has a second electrode terminal piece 15B as a positive electrode protruding from the second edge 43 on the other adjacent battery cell side of the battery cell side surface 39a. The second electrode terminal piece 15B is formed in a strip shape orthogonal to the battery cell side surface 39a.
Then, the conductive clip 63 is attached so as to sandwich the portion where the first electrode terminal piece 17B and the second electrode terminal piece 15B are overlapped, whereby the second electrode terminal piece 15B and the first electrode terminal piece 17B. And are electrically connected.

Even in such a battery cell 27B, since the first electrode terminal piece 17B and the second electrode terminal piece 15B are provided on the battery cell side surface 39a, the electrode terminal 505 protrudes upward from the battery cell 503 (see FIG. 7). ), Battery cells 27B can be easily multistaged in the vertical direction. Thereby, the high-density arrangement of the plurality of battery cells 27B becomes possible.
However, these battery cells 27B need to be electrically connected by attaching the conductive clip 63 to the first electrode terminal piece 17B and the second electrode terminal piece 15B overlapped after being fixed to a case (not shown). Since space is required, the case becomes larger.
On the other hand, in the battery cell 27 in the battery pack 11 of the present embodiment, the first electrode terminal piece 15 and the second electrode terminal piece 17 are conductively connected by the conductive clip 21 simultaneously with the insertion into the case 13 as described above. Therefore, an electrical connection operation for connecting the electrode terminals to each other in a fixed state after the battery cell 27 is fixed is unnecessary, and a connection work space is also unnecessary, so that the case 13 can be prevented from being enlarged.

  Further, in the battery pack 11 of the present embodiment, the terminal accommodating portions 19 are arranged in two stages apart from each other in the vertical direction of the inner wall surface 53, and the upper terminal accommodating portion 19 is in relation to the lower terminal accommodating portion 19. The battery cells 27 are arranged offset in the adjacent direction. Thus, when the lower battery cell 27 is inserted, the first electrode terminal piece 15 and the side surface vertical piece 47 do not interfere with the upper terminal accommodating portion 19. Thereby, the battery cell 27 on the lower stage side can be attached in the downward vertical direction, and the attachment work of the battery cells 27 arranged in two stages becomes easy.

  Further, in the battery pack 11 of the present embodiment, a terminal insertion guide surface 59 is formed on the open side of the conductive clip 21. Therefore, when the battery cell 27 is inserted into the case 13, the battery cell 27 is inserted from the upper opening 23 of the case 13 toward the case bottom side. At this time, if the first electrode terminal piece 15 or the side surface vertical piece 47 of the battery cell 27 is displaced from the terminal holding space 57 of the conductive clip 21, the first electrode terminal piece 15 or the side surface vertical piece 47 is guided to insert a terminal. Abuts on surface 59. In the battery cell 27 in which the first electrode terminal piece 15 or the side surface vertical piece 47 is in contact with the terminal insertion guide surface 59, the first electrode terminal piece 15 or the side surface vertical piece 47 is moved along the terminal insertion guide surface 59.

  The first electrode terminal piece 15 or the side surface vertical piece 47 moved along the terminal insertion guide surface 59 is inserted into the terminal holding space 57. At the same time, the battery cell 27 is arranged at a predetermined position via the first electrode terminal piece 15 or the side surface vertical piece 47. As a result, the battery cell 27 is corrected for misalignment at the time of insertion, can be smoothly inserted into the terminal, and good workability can be obtained. Further, positioning of the subsequent battery cell fixing work can be completed at the same time.

  Therefore, according to the battery pack 11 according to the present embodiment, the plurality of battery cells 27 can be arranged at high density, and the electrical connection work after the battery cells 27 are fixed can be made unnecessary.

DESCRIPTION OF SYMBOLS 11 ... Battery pack 13 ... Case 15 ... 1st electrode terminal piece 17 ... 2nd electrode terminal piece 19 ... Terminal accommodating part 21 ... Conductive clip 23 ... Upper opening 27 ... Battery cell 39a, 39b ... Battery cell side surface 41 ... 1st Edge 43 ... second edge 45 ... side parallel piece 47 ... side vertical piece 53 ... inner wall surface 55 ... upper insertion port 59 ... terminal insertion guide surface

Claims (3)

A plurality of battery cells and a case having an upper opening for accommodating these battery cells adjacent to each other;
A first electrode terminal piece projecting from the first edge of one battery cell side of the battery cell side surface of the battery cell;
A second electrode terminal piece projecting from the second edge of the battery cell side surface on the other adjacent battery cell side;
An upper part protruding from the inner wall surface of the case and into which the first electrode terminal piece and the second electrode terminal piece of adjacent battery cells of the plurality of battery cells housed and fixed in the case are inserted inward. A U-shaped terminal accommodating portion having an insertion port;
A substantially U-shaped conductive clip attached to the inside of the terminal accommodating portion and sandwiching the inserted first electrode terminal piece and the second electrode terminal piece;
A battery pack comprising:   The terminal accommodating portions are arranged in a plurality of stages apart from each other in the vertical direction of the inner wall surface, and the terminal accommodating portions in each stage are offset in the direction adjacent to the battery cell with respect to the terminal accommodating portions in other stages The battery pack according to claim 1, wherein the battery pack is disposed in a manner.   3. The battery pack according to claim 1, wherein the conductive clip has a terminal insertion guide surface that gradually expands outward on the clip opening side. 4.

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