JP2020136170A - Battery pack - Google Patents

Abstract

To provide technology capable of contributing to high performance of a battery pack and improvement of production efficiency, while realizing good connection of electrode terminals and inter cell connection members.SOLUTION: In a battery pack 1, positive electrode junctions 15 and negative electrode junctions 17 are placed step-wise in the plan view. An inter cell connection member 30 of such a battery pack 1 includes multiple base parts for connecting the positive electrode junctions 15 and negative electrode junctions 17 facing each other in the arrangement direction X, and a coupling part 38 for coupling the multiple base parts 32, respectively. With such an arrangement, sufficient connection area can be secured without elongating electrode terminals 14, 16 more than required in the height direction. Furthermore, since an interval of four single cells can be provided between the positive electrode junction 15 and the negative electrode junction 17 facing each other, the base parts 32 and the electrode junctions 15, 17 are easily sandwiched and connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to an assembled battery including a plurality of single cells.

A secondary battery such as a lithium ion secondary battery or a nickel-metal hydride battery, or a power storage element such as a capacitor is used as a single cell, and an assembled battery equipped with a plurality of the single cells is important as a power source for mounting on a vehicle or a power source for a personal computer or a mobile terminal. The sex is increasing. In particular, an assembled battery using a lithium ion secondary battery as a single cell, which is lightweight and has a high energy density, is preferably used as a high output power source for mounting on a vehicle. In such an assembled battery, a plurality of single cells are arranged along a predetermined arrangement direction, and the electrode terminals (positive electrode terminal and negative electrode terminal) of each single cell are electrically connected by an inter-cell connecting member (bus bar or the like). Constructed by.

An example of the structure of such an assembled battery is the structure shown in FIG. In the assembled battery 100 shown in FIG. 5, a plurality of single cells 110a (first cell group A) in which the positive electrode terminal 114 is directed upward in the height direction Z, and a plurality of single cells in which the negative electrode terminal 116 is directed upward. A cell 110b (second cell group B) is provided, and the first cell group A and the second cell group B are alternately arranged along the arrangement direction X. Then, the positive electrode terminals 114 of each single cell 110a constituting the first cell group A are bundled to form a positive electrode terminal bundle 114a, and the negative electrode terminals 116 of each single cell 110b constituting the second cell group B are formed. The negative electrode terminal bundle 116a is formed by being bundled. On the other hand, in this assembled battery 100, a plate-shaped bus bar 130 having a base portion 132 extending along the arrangement direction X is used. Both ends 134 and 136 of the bus bar 130 in the arrangement direction X are bent upward in the height direction Z. The bus bar 130 is arranged so that one end 134 is adjacent to the positive electrode bundle 114a of the first cell group A and the other end 136 is adjacent to the negative electrode bundle 116a of the second cell group B. Has been done. Then, by sandwiching one end 134 and the positive electrode terminal bundle 114a and joining them by ultrasonic welding or the like, each single cell 110a constituting the first cell group A and the bus bar 130 are connected. Similarly, by sandwiching and joining the other end portion 136 and the negative electrode terminal bundle 116a, each single cell 110b constituting the second cell group B and the bus bar 130 are connected. As a result, the single cells 110a and 110b constituting the assembled battery 100 are electrically connected via the bus bar 130.

Further, as another example of the structure of the assembled battery, the structure disclosed in Patent Document 1 can be mentioned. In Patent Document 1, each electrode (electrode terminal) of a plurality of laminated cell batteries (single cells) is electrically connected in parallel by a connecting member, and the connecting members are connected in series by a bus bar. The technology to be used is disclosed. Then, in this document, as the connecting member, a wave-shaped conductive member having a folded sandwiching portion formed by folding so as to sandwich a plate-shaped electrode terminal is used.

Japanese Unexamined Patent Publication No. 2011-181369

By the way, in the field of assembled batteries in recent years, there is a demand for a new structure capable of suitably connecting the above-mentioned single cells to each other in order to improve the performance and the production efficiency.

For example, in the assembled battery 100 shown in FIG. 5, if the height h1 of the positive electrode terminal bundle 114a and the negative electrode terminal bundle 116a (electrode terminal bundle) is insufficient, the connection area with the bus bar 130 becomes narrow and the strength decreases at the connection portion. Since heat generation during energization may occur, it is required to lengthen the electrode terminals to sufficiently secure the height h1 of the electrode terminal bundle. However, in general, since the installation space when using the assembled battery is limited, the size of the cell body 112 is reduced by the lengthening of the electrode terminals. That is, the assembled battery shown in FIG. 5 has a problem that the battery performance (energy density) is limited in order to realize an appropriate connection between single cells.

On the other hand, in the assembled battery described in Patent Document 1, it is considered that one electrode terminal and the folded-back holding portion are sandwiched and joined. According to such a connection structure, it is not necessary to form a bundle of electrode terminals, so that a sufficient connection area can be secured without lengthening the electrode terminals. However, in the assembled battery having such a structure, since the width of the distance between the adjacent electrode terminals can be secured only about one single cell, it becomes difficult to sandwich and connect the electrode terminals and the folded-back holding portion. For this reason, there is a risk that production efficiency may decrease due to precision work and strength may decrease due to poor joining.

The present invention has been made to solve such a problem, and its main purpose is to improve the performance and production efficiency of the assembled battery while realizing a suitable connection between the electrode terminal and the cell-cell connection member. The purpose is to provide technology that can contribute to the improvement of.

In order to realize the above object, the present invention provides an assembled battery having the following configuration.

In the assembled battery disclosed here, a plurality of single cells are arranged along a predetermined arrangement direction, and each of the single cells is electrically connected by an inter-cell connecting member. Each of the plurality of single cells constituting the assembled battery is connected to the cell body in which the electrode body is housed in the exterior body, one end is connected to the electrode body in the exterior body, and the other end is directed to one in the height direction. A plate-shaped positive electrode terminal extending from the outside and a plate-shaped negative electrode terminal having one end connected to an electrode body inside the exterior and the other end extending toward the other in the height direction are provided. A plate-shaped positive electrode joint extending outward from the other region of the other end of the positive electrode terminal in the height direction is formed, and the negative electrode terminal is formed on the negative electrode terminal, and the negative electrode terminal is formed outside the exterior body. A plate-shaped negative electrode joint extending toward the other in the height direction from the other region at the other end is formed. Then, in the arrangement of the plurality of single cells, the first cell group in which the plurality of single cells with the positive electrode junction directed upward in the height direction are arranged, and the plurality of single cells with the negative electrode junction directed upward in the height direction. There is at least one array unit arranged adjacent to the second cell group in which the single cells of No. 1 are arranged. Further, in the first cell group, a plurality of single cells are arranged so that each positive electrode joint is arranged in a staircase pattern in a plan view, and in the second cell group, each negative electrode joint is stepped in a plan view. A plurality of single cells are arranged so as to be arranged in a shape. Here, in the arrangement direction, the single cell arranged on the most upstream side of the first cell group is designated as the A-1st single cell, and the single cell arranged on the most downstream side is designated as the Annth single cell. When the single cell arranged on the most upstream side of the second cell group is the B-1st single cell and the single cell arranged on the most downstream side is the Bnth single cell, the cell-to-cell connecting member is , A-from the first base portion which is a plate-shaped member extending along the arrangement direction and connects the positive electrode joint portion of the A-1st single cell and the negative electrode joint portion of the B-1st single cell. The n base portions up to the nth base portion connecting the positive electrode joint portion of the nth single cell and the negative electrode junction portion of the Bnth single cell, and n- connecting each of the n base portions. It has one connecting part.

In the assembled battery disclosed here, each of the positive electrode joint and the negative electrode joint arranged in a stepped manner can be connected in a one-to-one relationship by the base portion of the cell-cell connection member, and is therefore shown in FIG. It is not necessary to form a bundle of electrode terminals as in an assembled battery. As a result, a sufficient connection area can be secured without making the electrode terminals longer than necessary, so that the strength of the connection portion and the energy density can be compatible at a high level.
Further, since the electrode joints are arranged in a stepped manner, the positive electrode joint and the negative electrode joint (for example, the positive electrode joint of the Annth single cell and the Bnth single cell) facing each other in the arrangement direction A space for n single cells can be provided between the negative electrode joint portion). As a result, it becomes easy to sandwich and connect the base portion and the electrode joint portion, which can contribute to improvement of production efficiency and prevention of connection failure.

It is a top view which shows typically the assembled battery which concerns on one Embodiment of this invention. It is a side view which shows typically the assembled battery which concerns on one Embodiment of this invention. It is a front view which shows typically the single cell used for the assembled battery which concerns on one Embodiment of this invention. It is a top view which shows typically the assembled battery which concerns on other embodiment of this invention. It is a side view which shows typically the conventional assembled battery.

Hereinafter, as the assembled battery according to the embodiment of the present invention, an assembled battery having a lithium ion secondary battery as a single cell and a plurality of the lithium ion secondary batteries will be described as an example. The single cell used in the assembled battery disclosed here is not limited to the lithium ion secondary battery, and for example, a secondary battery such as a nickel hydrogen battery or a power storage element such as a capacitor can also be used.

Further, in the following drawings, members / parts having the same action will be described with the same reference numerals. The dimensional relationships (length, width, thickness, etc.) in each figure do not reflect the actual dimensional relationships. In addition, matters other than those specifically mentioned in the present specification and necessary for carrying out the present invention (for example, materials for electrodes and electrolytes) are designed by those skilled in the art based on the prior art in the art. It can be grasped as a matter.

1. 1. The assembled battery according to the present embodiment FIG. 1 is a plan view schematically showing the assembled battery according to the present embodiment. Further, FIG. 2 is a side view schematically showing the assembled battery according to the present embodiment. In each of the figures of the present specification, the reference numeral X indicates the “arrangement direction”, the reference numeral Y indicates the “width direction”, and the reference numeral Z indicates the “height direction”. In the present specification, the left side of the arrangement direction X in FIG. 1 is referred to as "upstream side", and the right side is referred to as "downstream side". It should be noted that these directions are defined for convenience of explanation, and are not intended to limit the installation mode of the assembled battery and the single cell.

(1) Overall Structure As shown in FIG. 1, the assembled battery 1 according to the present embodiment includes a plurality of (16 in FIG. 1) single cells 10 arranged along the arrangement direction X, and each of them. The single cell 10 is electrically connected by the cell-to-cell connecting member 30. Further, in the present embodiment, a restraining member for restraining a plurality of arranged single cells 10 to maintain the outer shape of the assembled battery 1 is provided. Such a restraint member includes a pair of restraint plates 52 that sandwich the plurality of arranged single cells 10 from both outer sides in the arrangement direction X, and a bridging member 54 that bridges the pair of restraint plates 52.

(2) Structure of Single Cell FIG. 3 is a side view schematically showing a single cell used in the assembled battery according to the present embodiment. As shown in FIG. 3, the single cell 10 in the present embodiment includes a cell body 12 in which an electrode body (not shown) is housed in an exterior body 11, a positive electrode terminal 14, and a negative electrode terminal 16. In the present embodiment, a laminated film is used as the exterior body 11, and the electrode body and the electrolyte are sealed inside the laminated film. As for the electrode body and the electrolyte in the exterior body 11, the same ones as those of the conventional general lithium ion secondary battery can be used without particular limitation, and the present invention is not limited, so detailed description thereof will be omitted. ..

The positive electrode terminal 14 is a plate-shaped conductive member whose part is exposed to the outside of the exterior body 11. Specifically, one end (not shown) of the positive electrode terminal 14 is connected to the positive electrode of the electrode body in the exterior body 11, and the other end 14a faces one of the height directions Z (left side in FIG. 3). Is extending. The positive electrode terminal 14 in the present embodiment is formed with a plate-shaped positive electrode joint 15 extending toward one of the height directions Z from the other region of the other end 14a of the positive electrode terminal 14 outside the exterior body 11. ing. As will be described in detail later, the cell-cell connection member 30 is connected to the positive electrode joint 15 (see FIG. 1). As shown in FIG. 1, the formation position of the positive electrode joint portion 15 in the width direction Y is different for each of the plurality of arranged single cells 10, and is not limited to the position shown in FIG. Further, as the material of the positive electrode terminal 14, the same material as that of a general lithium ion secondary battery (for example, aluminum, aluminum alloy, etc.) can be used without particular limitation.

The negative electrode terminal 16 in this embodiment has a structure substantially equivalent to that of the positive electrode terminal 14 described above. Specifically, one end (not shown) of the negative electrode terminal 16 is connected to the negative electrode of the electrode body in the exterior body 11, and the other end 16a faces the other side in the height direction Z (right side in FIG. 3). Is extending. Then, the negative electrode terminal 16 in the present embodiment has a plate-shaped negative electrode joint portion 17 that extends toward the other side in the height direction Z from the other region of the other end 16a of the negative electrode terminal 16 outside the exterior body 11. Is formed. Similar to the positive electrode joint portion 15, the formation position of the negative electrode joint portion 17 in the width direction Y is also different for each of the plurality of arranged single cells 10, and is not limited to the position shown in FIG. 3 (FIG. 1). reference). As the material of the negative electrode terminal 16, the same material as that of a general lithium ion secondary battery (for example, copper, copper alloy, etc.) can be used without particular limitation.

(3) Arrangement of Single Cells In the assembled battery 1 according to the present embodiment, a plurality of single cells 10 having the above-described structure are arranged along the arrangement direction X. The arrangement of the single cell 10 in this embodiment will be described.

As shown in FIG. 1, the assembled battery 1 according to the present embodiment includes two array units in which the first cell group A and the second cell group B are arranged adjacent to each other. Specifically, as shown in FIG. 2, in the first cell group A, there are a plurality of single cells 10a1 to 10a4 in a state where the positive electrode joint portion 15 of the positive electrode terminal 14 is directed upward (in FIGS. 1 and 2). 4) are arranged. On the other hand, in the second cell group B, a plurality (4) of single cells 10b1 to 10b4 in a state where the negative electrode bonding portion 17 of the negative electrode terminal 16 is directed upward are arranged. Then, as shown in FIG. 1, the assembled battery 1 according to the present embodiment is constructed by alternately arranging the first cell group A and the second cell group B in the arrangement direction X.

Here, for convenience of explanation, in the present specification, the single cell arranged on the most upstream side of the first cell group A is referred to as "A-1st single cell 10a1". Then, the single cells after the A-1st single cell 10a1 are referred to as "A-2nd single cell 10a2, A-3rd single cell 10a3 ..., Annth single cell 10an". As described above, the SEQ ID NOs are sequentially increased toward the downstream side of the arrangement direction X. On the other hand, regarding the single cells constituting the second cell group B, the single cells arranged on the most upstream side are referred to as "B-1st single cell 10b1", and the single cells after "B-1st single cell". The cell numbers are sequentially arranged toward the downstream side of the arrangement direction X, such as "B-2nd single cell 10b2, B-3rd single cell 10b3 ..., Bnth single cell 10bn". Called to increase. As described above, in the assembled battery 1 according to the present embodiment, the number of single cells constituting each cell group is four (n = 4).

Further, as described above, the single cells 10 used in the present embodiment have different formation positions of the positive electrode joints 15 in the width direction Y. Specifically, the positive electrode joint portion 15 is formed in any of four regions obtained by dividing the positive electrode terminal 14 into four equal parts in the width direction Y. The single cells 10a1 to 10a4 constituting the first cell group A are arranged so that the four types of positive electrode joints 15 are arranged in a stepped manner in a plan view. Specifically, the positive electrode junction 15 in the first cell group A is from one side (upper side in FIG. 1) to the other side (lower side in FIG. 1) in the width direction Y from the upstream side to the downstream side in the arrangement direction X. They are arranged in a staircase pattern so that they are sequentially displaced toward the side).

Further, in the present embodiment, the negative electrode joint portion 17 is also arranged in a stepped manner in a plan view like the positive electrode joint portion 15. Specifically, the negative electrode joint portion 17 is formed in any of four regions obtained by dividing the negative electrode terminal 16 into four equal parts in the width direction Y. Then, in the second cell group B, as the four types of negative electrode joints 17 move from the upstream side to the downstream side in the arrangement direction X, one of the width directions Y (upper side in FIG. 1) to the other (in FIG. 1). It is arranged in a staircase pattern so that it shifts to the lower side in sequence.

By arranging both the positive electrode joint portion 15 and the negative electrode joint portion 17 in a stepped manner in this way, the positive electrode joint portion 15 of a single cell having the same sequence number between the first cell group A and the second cell group B is arranged. And the negative electrode joint 17 face each other. For example, in the assembled battery 1 shown in FIG. 1, the positive electrode bonding portion 15 of the A-1st single cell 10a1 and the negative electrode bonding portion 17 of the B-1st single cell 10b1 face each other, and the A-2nd unit is located. The positive electrode joint portion 15 of the single cell 10a2 and the negative electrode joint portion 17 of the B-2nd single cell 10b2 face each other. Similarly, in the single cell having the third sequence number and the fourth single cell, the positive electrode joint portion 15 and the negative electrode joint portion 17 are arranged so as to face each other. At this time, an interval s1 is provided between the positive electrode joint portion 15 and the negative electrode joint portion 17 facing each other at the same degree as the single cell 10 constituting the cell group (in FIG. 2, about four single cells).

(3) Cell-to-cell connection member As described above, each of the single cells 10 constituting the assembled battery 1 according to the present embodiment is electrically connected by the cell-to-cell connection member 30. The cell-to-cell connecting member 30 in the present embodiment has the same number (n = 4) of base portions 32 as the single cells 10 constituting the cell group and one less number (n-1 = 3) than the base portion 32. The connecting portion 38 is provided.

The base portion 32 is a conductive plate-shaped member made of aluminum, an aluminum alloy, or the like. The base portion 32 extends along the arrangement direction X, and connects each of the positive electrode joint portion 15 and the negative electrode joint portion 17 arranged so as to face each other. For example, in the assembled battery 1 of FIG. 1, the positive electrode joint portion 15 of the A-1st single cell 10a1 and the negative electrode joint portion 17 of the B-1st single cell 10b1 are connected by the first base portion 32a. The positive electrode joint portion 15 of the A-2nd single cell 10a2 and the negative electrode joint portion 17 of the B-2nd single cell 10b2 are connected by the second base portion 32b. Similarly, in the single cell having the third sequence number and the fourth single cell, the positive electrode joint portion 15 and the negative electrode joint portion 17 facing each other are connected to the base portion 32 (third base portion 32c, fourth base portion 32d). Connected by.
As shown in FIG. 2, the ends 34 and 36 of each base portion 32 in the arrangement direction X are bent upward in the height direction Z. Then, in a state where the ends 34 and 36 of the base portion 32 are arranged along the positive electrode joint portion 15 (or the negative electrode joint portion 17), the end portion 34 of the base portion 32 and the positive electrode joint portion 15 (or the end portion 36) are arranged. The positive electrode joint portion 15 (negative electrode joint portion 17) and the base portion 32 are connected by sandwiching and joining the negative electrode joint portion 17). Conventionally known bonding means such as ultrasonic welding, laser welding, and resistance welding are used to connect the positive electrode bonding portion and the negative electrode bonding portion (electrode bonding portion) to the base portion.

Then, as shown in FIG. 1, in the cell-cell connecting member 30 in the present embodiment, each of the four base portions 32 is connected by the connecting portion 38. The connecting portion 38 is a conductive portion provided between two adjacent base portions 32 in the width direction Y. By connecting the base portions 32 with the connecting portion 38, the single cells 10a1 to 10a4 constituting the first cell group A are electrically connected in parallel, and each single cell constituting the second cell group B is formed. The cells 10b1 to 10b4 are electrically connected in parallel. Then, the first cell group A and the second cell group B are electrically connected in series by the cell-to-cell connecting member 30 provided with the base portion 32 and the connecting portion 38.

On the bottom surface side of the assembled battery 1 (not shown in FIG. 1), a plurality of (4) negative electrode terminals 16 in the first cell group A arranged on the most upstream side in the arrangement direction X serve as total negative terminals. A plurality of (4) positive electrode terminals 14 in the second cell group B arranged on the most downstream side serve as total positive terminals. These total positive terminals and total negative terminals are connected to external devices such as vehicle motors. Then, on the bottom surface side of the assembled battery 1, the second cell group B arranged second from the upstream side in the arrangement direction X and the first cell group A arranged third are the upper surfaces shown in FIG. It is connected by an inter-cell connecting member 30 having the same structure as the side.

2. 2. Effect of the present embodiment As described above, in the assembled battery 1 according to the present embodiment, the positive electrode joint portion 15 and the negative electrode joint portion of the single cell having the same sequence number between the first cell group A and the second cell group B. 17 is opposed to each other, and the opposite positive electrode joint portion 15 and the negative electrode joint portion 17 are connected by a base portion 32 of the cell-to-cell connecting member 30. As a result, each of the electrode joint portions 15 and 17 can be connected by the base portion 32 in a one-to-one relationship, so that it is not necessary to form the electrode terminal bundles 114a and 116a as in the assembled battery 100 shown in FIG. As a result, it is possible to sufficiently secure the area (height h2) of the connection portion between the base portion and the electrode joint portion without making the electrode terminals 14 and 16 longer than necessary. Therefore, according to the assembled battery 1 according to the present embodiment, the strength of the connecting portion between the electrode joint portions 15 and 17 and the base portion 32 and the energy density of the assembled battery 1 depending on the size of the cell body 12 are at a high level. Can be compatible with.

Further, in the present embodiment, since each of the positive electrode joint portion 15 and the negative electrode joint portion 17 is arranged in a stepped manner in a plan view, a single cell n is located between the positive electrode joint portion 15 and the negative electrode joint portion 17 facing each other. It is possible to provide an interval s1 of about one piece. Therefore, when connecting the electrode joint portion and the base portion by ultrasonic welding, laser welding, resistance welding or the like, it becomes easy to sandwich the electrode joint portion and the base portion with a bonding device. Therefore, the connection of the single cell 10 by the cell-to-cell connecting member 30 can be simplified to improve the production efficiency, and the strength of the connecting portion can be prevented from being lowered due to the poor joining.

3. 3. Assembled Battery According to Other Embodiments Although the assembled battery 1 according to one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made.

(1) Number of Single Cells The assembled battery 1 according to the above-described embodiment forms two first cell groups A and two second cell groups B composed of four single cells 10, and the first cell group A. And the second cell group B are arranged alternately. However, the assembled battery disclosed herein is not limited to the above-described embodiment as long as it includes at least one array unit in which the first cell group and the second cell group are arranged adjacent to each other. For example, the technique disclosed herein can be suitably applied to an assembled battery constructed by forming three or more first cell groups and three or more second cell groups and arranging these cell groups alternately.

Further, the number of single cells constituting each cell group is not particularly limited as long as it is a plurality (two or more), and can be appropriately increased or decreased from four in the above-described embodiment. Since the number of single cells (n) constituting the cell group corresponds to the number of base portions (n) and the number of connecting portions (n-1) of the inter-cell connecting member, the number of single cells is concerned. The structure of the cell-to-cell connecting member (the number of base portions and connecting portions) can be appropriately changed according to the increase or decrease of.

Further, the assembled battery disclosed here may include a single cell that does not belong to any of the first cell group and the second cell group. For example, a form in which one single cell is arranged on the most upstream side and / or the most downstream side in the arrangement direction can also be included in the assembled battery disclosed herein. That is, the number of all single cells constituting the assembled battery does not necessarily have to be a multiple of the number n of single cells constituting the cell group.

(2) Connecting portion The connecting portion of the cell-cell connecting member need only be able to connect two adjacent base portions, and the specific structure and dimensions are not particularly limited. However, as shown in FIG. 4, if the length L2 of the connecting portion 38 in the arrangement direction X is shortened, the safety at the time of an internal short circuit can be improved. Specifically, when the cell-to-cell connecting member 30 having a short length L2 of the connecting portion 38 is used, when an abnormality such as an internal short circuit occurs in some single cells (for example, the A-2nd single cell 10a2). In addition, it is possible to suppress the inflow of current from the other single cells 10a1, 10a3, and 10a4 via the connecting portion 38. However, considering the strength of the cell-to-cell connecting member 30, it is preferable to secure a certain length L2 of the connecting portion 38. From this point of view, the length L2 of the connecting portion 38 is preferably adjusted to 2 mm to 20 mm (preferably 5 mm to 10 mm).

(3) Single cell structure The detailed structure of the single cell is not limited to the above-described embodiment. For example, in the single cell 10 in the above-described embodiment, the other end 14a of the positive electrode terminal 14 and the other end 16a of the negative electrode terminal 16 are exposed to the outside of the exterior body 11. However, in the assembled battery disclosed here, at least the positive electrode joint portion and the negative electrode joint portion need to be present on the outside of the exterior body. That is, the assembled battery disclosed herein may include a form in which only the positive electrode joint portion and the negative electrode joint portion are present on the outside of the exterior body. However, considering the strength of the electrode terminals, it is preferable that the other end 14a of the positive electrode terminal 14 and the other end 16a of the negative electrode terminal 16 are exposed to the outside of the exterior body 11 as in the above-described embodiment.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

1 set battery 10 single cell 11 exterior body 12 cell body 14 positive electrode terminal (electrode terminal)
15 Positive electrode joint (electrode joint)
16 Negative electrode terminal (electrode terminal)
17 Negative electrode joint (electrode joint)
30 Cell-to-cell connection member 32 Base part 38 Connection part 52 Restraint plate 54 Cross-linking member

Claims (1)

A battery pack in which a plurality of single cells are arranged along a predetermined arrangement direction, and each of the single cells is electrically connected by an inter-cell connecting member.
Each of the plurality of single cells
The cell body in which the electrode body is housed in the outer body, and
A plate-shaped positive electrode terminal having one end connected to the electrode body in the exterior body and the other end extending toward one side in the height direction.
One end is connected to the electrode body in the exterior body, and the other end is provided with a plate-shaped negative electrode terminal extending toward the other in the height direction.
On the positive electrode terminal, a plate-shaped positive electrode joint extending outside the exterior body toward one side in the height direction from the other region at the other end of the positive electrode terminal is formed, and
The negative electrode terminal is formed with a plate-shaped negative electrode joint extending outside the exterior body toward the other in the height direction from the other region at the other end of the negative electrode terminal.
In the array of the plurality of single cells
A first cell group in which a plurality of single cells with the positive electrode junction facing upward in the height direction are arranged, and a second cell group in which a plurality of single cells with the negative electrode junction facing upward in the height direction are arranged. There is at least one array unit in which cells are arranged adjacent to each other,
In the first cell group, the plurality of single cells are arranged so that each of the positive electrode joints is arranged in a stepped manner in a plan view.
In the second cell group, a plurality of single cells are arranged so that each of the negative electrode joints is arranged in a stepped manner in a plan view.
In the arrangement direction, the single cell arranged on the most upstream side of the first cell group is designated as the A-1st single cell, and the single cell arranged on the most downstream side is designated as the Annth single cell. When the single cell arranged on the most upstream side of the second cell group is the B-1st single cell and the single cell arranged on the most downstream side is the Bnth single cell.
The cell-to-cell connecting member
From the first base portion which is a plate-shaped member extending along the arrangement direction and connects the positive electrode joint portion of the A-1st single cell and the negative electrode joint portion of the B-1st single cell. N base portions up to the nth base portion connecting the positive electrode joint portion of the NNth single cell and the negative electrode junction portion of the BNth single cell, and
An assembled battery including n-1 connecting portions for connecting each of the n base portions.

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