CN218300145U - Battery device - Google Patents

Abstract

The application is applicable to the technical field of batteries, and provides a battery device which comprises a battery core component and a shell component; the battery core assembly comprises a first battery core and a second battery core, the first battery core and the second battery core are sequentially distributed along a first direction, a first pole column is arranged at one end of the first battery core facing the second battery core along the first direction, a second pole column is arranged at one end of the second battery core facing the first battery core along the first direction, and a conductive piece is supported between the first pole column and the second pole column; the shell assembly comprises a first shell and a second shell, and the positions of the first shell and the second shell are relatively fixed; the first casing abuts against one end, facing away from the second battery cell, of the first battery cell, and the second casing abuts against one end, facing away from the first battery cell, of the second battery cell. In this embodiment, complicated connection processes such as welding and threaded connection are omitted, so that the electrical connection process between the first battery cell and the second battery cell is relatively simple, and the assembly cost of the battery device is reduced.

Description

Battery device

Technical Field

The application belongs to the technical field of batteries, and more specifically relates to a battery device.

Background

In the field of battery technology, a battery device is composed of a plurality of battery cells connected in series and parallel, generally, any two adjacent battery cells are connected in series or in parallel through a busbar made of copper, aluminum or the like, and specifically, the busbar is connected to a pole of the battery cell by a threaded connection, a welding or the like. However, the current methods of screw connection and welding make the connection process between the bus bar and the terminal complicated, which leads to a complicated series-parallel connection process between a plurality of battery cells, and increases the assembly cost of the battery device.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the embodiment of the application is as follows: the utility model provides a battery device, aims at solving among the prior art, the series-parallel connection technology between a plurality of electric cores is comparatively loaded down with trivial details, complicated technical problem.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:

provided is a battery device including:

the battery core assembly comprises a first battery cell and a second battery cell, the first battery cell and the second battery cell are sequentially distributed along a first direction, a first pole column is arranged at one end, facing the second battery cell, of the first battery cell along the first direction, a second pole column is arranged at one end, facing the first battery cell, of the second battery cell along the first direction, and a conductive piece is abutted between the first pole column and the second pole column;

the shell assembly comprises a first shell and a second shell, and the positions of the first shell and the second shell are relatively fixed; the first shell is supported and held at one end of the first battery cell, which faces away from the second battery cell, and the second shell is supported and held at one end of the second battery cell, which faces away from the first battery cell.

In one embodiment, the conductive component comprises a conductive part which has elastic performance and is elastically pressed between the first pole column and the second pole column.

In one embodiment, the conductive portion is a metal spring, a metal mesh, or a conductive rubber.

In one embodiment, the conductive member further includes socket portions respectively disposed at two opposite ends of the conductive portion, and the first pole post and the second pole post are respectively plugged into the socket portions at two ends of the conductive portion.

In one embodiment, the sleeving parts at the two ends respectively abut against the first battery cell and the second battery cell.

In one embodiment, the sleeve connection part has elastic performance, and the sleeve connection parts at two ends are respectively elastically sleeved on the first pole column and the second pole column.

In one embodiment, the conductive member is sheathed with an insulating sheath.

In one embodiment, the number of the first battery cells and the number of the second battery cells are multiple, the first casing abuts against the multiple first battery cells, and the second casing abuts against the multiple second battery cells; each second electric core is just to two adjacent first electric cores along first direction, and two second utmost point posts of each second electric core support through electrically conductive piece one-to-one and hold in the first utmost point post of two adjacent first electric cores to make a plurality of first electric cores and a plurality of second electric cores form the series connection.

In one embodiment, the plurality of first battery cells form a plurality of rows of first battery cells sequentially arranged along the second direction, and each row of first battery cells sequentially arranged along the third direction; the second direction is parallel to the thickness direction of the first battery cell, the second direction is perpendicular to the third direction, and both the second direction and the third direction are perpendicular to the first direction;

the plurality of second battery cells form a first array group and a second array group, the second battery cells of the first array group just face to two first battery cells adjacent along the third direction, and the two first battery cells adjacent along the third direction form series connection through a conductive piece; the second cells of the second array group are right opposite to two adjacent first cells along the second direction, and two adjacent rows of the first cells are connected in series through the conductive pieces.

In one embodiment, at least a portion of the first cells are sequentially distributed along a second direction, where the second direction is parallel to the thickness of the first cell and perpendicular to the first direction; each second battery cell is right opposite to two first battery cells adjacent along the second direction, and the two adjacent first battery cells are connected in series through the conductive piece.

The battery device that this application embodiment provided's beneficial effect lies in:

the battery device provided by the embodiment of the application, during assembly, the conductive piece is abutted between the first pole column of the first battery cell and the second pole column of the second battery cell, then the first shell is abutted to the first battery cell, and the second shell is abutted to the second battery cell, so that the first shell and the second shell provide the abutting force in opposite directions towards the first battery cell and the second battery cell, and further the first pole column and the second pole column are stably abutted to opposite ends of the conductive piece, so as to realize the electrical connection of the first battery cell and the second battery cell, thus, complicated connection processes such as welding, threaded connection and the like are omitted, the electrical connection process between the first battery cell and the second battery cell is simpler, and the assembly cost of the battery device is further reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a diagram illustrating a layout of a cell assembly of a battery device according to an embodiment of the present disclosure;

FIG. 2 is a partial schematic view of the electrical core assembly provided in FIG. 1;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a schematic view of the conductive member of the electric core assembly provided in FIG. 2;

fig. 5 is a distribution diagram of an electric core assembly of a battery device provided in the second embodiment of the present application;

fig. 6 is a distribution diagram of a cell assembly of a battery device provided in the third embodiment of the present application.

Wherein, in the figures, the various reference numbers:

10-an electric core assembly; 11-a first cell; 12-a second cell; 13-a first pole; 13 a-positive total output; 13 b-negative total output; 14-a second pole; 15-a conductive member; 151-a conductive portion; 152-a socket joint; 16-an insulating sleeve; m-a first arrangement group; n-a second arrangement group; z-a first direction; y-a second direction; x-third direction.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise, wherein two or more includes two.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following detailed description is made with reference to the specific drawings and examples:

example one

Referring to fig. 1 to 3 together, a battery device according to an embodiment of the present invention includes a battery cell assembly 10 and a housing assembly (not shown), wherein the battery cell assembly 10 is disposed in the housing assembly.

Specifically, the battery core assembly 10 includes a first battery cell 11 and a second battery cell 12, and the first battery cell 11 and the second battery cell 12 are sequentially distributed along the first direction Z. The first cell 11 is provided with two first poles 13 facing one end of the second cell 12 along the first direction Z, and the two first poles 13 are respectively a positive pole and a negative pole. One end of the second battery cell 12 facing the first battery cell 11 along the first direction Z is provided with two second terminals 14, and the two second terminals 14 are a positive terminal and a negative terminal respectively on each second battery cell 12. A conductive piece 15 is abutted between the first pole column 13 and the second pole column 14, and it should be noted here that the conductive piece 15 is abutted between the first pole column 13 and the second pole column 14, so as to realize the electrical connection between the first pole column 13 and the second pole column 14, and further realize the electrical connection between the first battery cell 11 and the second battery cell 12; the "electrical connection" may be parallel connection or series connection.

The shell assembly comprises a first shell and a second shell, and the positions of the first shell and the second shell are relatively fixed; the first cell 11, the second cell 12 and the conductive member 15 are disposed between the first casing and the second casing, that is, the cell assembly 10 is disposed between the first casing and the second casing. The first casing supports and holds in the one end of first electric core 11 dorsad second electric core 12, and the second casing supports and holds in the one end of second electric core 12 dorsad first electric core 11 for first casing and second casing provide the opposite power of supporting of direction respectively to battery pack, and like this, first utmost point post 13 has certain pressure to electrically conductive piece 15 under the effect of first casing, and second utmost point post 14 has certain pressure to electrically conductive piece 15 under the effect of second casing, then first utmost point post 13 and second utmost point post 14 can support stably in electrically conductive piece 15 in opposite directions, in order to improve the stability of the electric connection of first utmost point post 13 and second utmost point post 14.

The positions of the first casing and the second casing are relatively fixed, so that when the first casing abuts against the first battery cell 11 and the second casing abuts against the second battery cell 12, the first casing and the second casing can maintain the abutting states of the first casing and the second casing to the battery cell assembly 10, respectively, which is helpful for maintaining the abutting states of the first pole column 13 and the second pole column 14 to the conductive member 15, respectively, that is, maintaining the electrical connection state of the first battery cell 11 and the second battery cell 12. Furthermore, the relative fixed positions of the first casing and the second casing also help to maintain the mechanical stability of the first cell 11 and the second cell 12 in the casing assembly, i.e., to improve the stability of the overall structure of the battery device.

Wherein the first direction Z is parallel to the height direction of the first cell 11 and the second cell 12.

The battery device provided in this embodiment of the application, during assembly, the conductive piece 15 is abutted between the first pole 13 of the first electrical core 11 and the second pole 14 of the second electrical core 12, then the first casing is abutted to the first electrical core 11, and the second casing is abutted to the second electrical core 12, so that the first casing and the second casing provide opposing forces in opposite directions toward the first electrical core 11 and the second electrical core 12, and further the first pole 13 and the second pole 14 are stably abutted to opposite ends of the conductive piece 15, so as to realize electrical connection between the first electrical core 11 and the second electrical core 12, thus, cumbersome and complicated connection processes such as welding and thread connection are omitted, so that the electrical connection process between the first electrical core 11 and the second electrical core 12 is relatively simple, and further, the assembly cost of the battery device is reduced.

In addition, connection steps such as welding and threaded connection are omitted, so that the electrical connection process of the first battery cell 11 and the second battery cell 12 does not cause permanent physical damage to the first pole 13 or the second pole 14, and secondary utilization of the first battery cell 11 and the second battery cell 12 is facilitated. In addition, in this embodiment, the difficulty of the electrical connection process of the first battery cell 11 and the second battery cell 12 is reduced, the efficiency of the electrical connection of the first battery cell 11 and the second battery cell 12 is also improved, the time cost is reduced, the consumption of mineral resources such as copper, aluminum, nickel and the like, electric power resources and fresh water resources is also saved, the environmental pollution is reduced, and the assembly cost of the battery device is lower.

In addition, first electric core 11 and second electric core 12 realize through first utmost point post 13, second utmost point post 14 and the piece 15 that electrically conducts supporting on the first direction Z and hold, and first casing and second casing support respectively along first direction Z and hold in electric core subassembly 10 along the relative both ends of first direction Z, so realized battery device's stable equipment effect.

In one embodiment, referring to fig. 2 to fig. 4, the conductive member 15 includes a conductive portion 151, and the conductive portion 151 has an elastic property and is elastically abutted between the first pole post 13 and the second pole post 14. It should be noted here that the elastic performance of the conductive portion 151 can provide a certain buffering effect for the first electrical core 11 and the second electrical core 12, on one hand, the damping effect of the electrical core assembly 10 is achieved, on the other hand, the improvement of the contact and abutting effect of the first terminal post 13 and the second terminal post 14 on the conductive member 15 is facilitated, and then the stability and reliability of the electrical connection between the first terminal post 13 and the second terminal post 14 can be improved, and meanwhile, the assembling stability of the battery device can also be improved.

In one embodiment, the conductive portion 151 is a conductive rubber, i.e., the conductive portion 151 is a rubber gasket, which has conductive and elastic properties; alternatively, the conductive portion 151 may be a metal spring, or the conductive portion 151 may be an elastic structure made of a metal mesh, or the conductive portion 151 may be another structure having elastic and conductive properties, for example, a metal spring sheet.

In an embodiment, referring to fig. 2 to fig. 4, the conductive member 15 further includes two socket portions 152, the two socket portions 152 are respectively disposed at two opposite ends of the conductive portion 151 along the first direction Z, and the first electrode posts 13 and the second electrode posts 14 are respectively plugged into the socket portions 152 at two ends of the conductive portion 151 in a one-to-one correspondence manner. In this embodiment, the two sleeving parts 152 are respectively sleeved outside the first electrode post 13 and the second electrode post 14, so that the positioning effect of the first electrode post 13 and the second electrode post 14 relative to the conductive part 15 is achieved, the first electrode post 13 and the second electrode post 14 can be respectively abutted to the conductive part 151 under the positioning effect of the sleeving part 152, and the sleeving effect of the sleeving part 152 can prevent the first electrode post 13 and the second electrode post 14 from being separated from the conductive part 15, so that the reliability and the stability of the electrical connection relationship between the first battery cell 11 and the second battery cell 12 can be improved.

Optionally, the sleeving part 152 may also be configured to have a conducting property, so that conduction between the first pole post 13 and the second pole post 14 can also be achieved through the sleeving part 152, which helps to further improve stability and reliability of the electrical connection relationship between the first battery cell 11 and the second battery cell 12.

In an embodiment, please refer to fig. 2, the sleeving parts 152 at two opposite ends of the conductive component 15 respectively abut against the first cell 11 and the second cell 12, and it can be understood that one end of one of the sleeving parts 152 away from the conductive part 151 abuts against one end of the first cell 11 away from the first casing, and one end of the other sleeving part 152 away from the conductive part 151 abuts against one end of the second cell 12 away from the second casing, that is, the conductive component 15 abuts not only between the first pole 13 and the second pole 14, but also between the first cell 11 and the second cell 12, so as to help to improve the structural stability of the electrical core component 10.

In one embodiment, the sleeve portion 152 has an elastic property, and the sleeve portions 152 at two ends of the conductive portion 151 are elastically sleeved on the first pole post 13 and the second pole post 14, so as to help improve the connection strength between the conductive member 15 and the first pole post 13 and the second pole post 14, respectively, and thus help improve the stability and reliability of the electrical connection relationship between the first battery cell 11 and the second battery cell 12.

In one embodiment, referring to fig. 4, an insulating sleeve 16 is disposed around the conductive member 15, which helps to insulate the conductive member 15 from the outside, thereby improving the safety of the core assembly 10.

In an embodiment, referring to fig. 1, the number of the first battery cells 11 and the number of the second battery cells 12 are both multiple, each of the first battery cells 11 and each of the second battery cells 12 are sequentially distributed along the first direction Z, the first casing abuts against one end of the multiple first battery cells 11 facing away from the second battery cells 12, and the second casing abuts against one end of the multiple second battery cells 12 facing away from the first battery cells 11. Each second cell 12 crosses over two adjacent first cells 11, and each second cell 12 faces the two adjacent first cells 11 along the first direction Z. Two second poles 14 of each second cell 12 are abutted to the first poles 13 of two adjacent first cells 11 in a one-to-one correspondence manner through the conductive pieces 15, that is, one of the first poles 13 of each second cell 12 is abutted to the first pole 13 of one of the two adjacent first cells 11 through the conductive pieces 15, and the other first pole 13 of the second cell 12 is abutted to the first pole 13 of the other one of the two adjacent first cells 11 through the conductive pieces 15, so as to realize series connection between the three cells of the two adjacent first cells 11 and the second cell 12, thereby enabling the plurality of first cells 11 and the plurality of second cells 12 to form series connection. The conductive member 15 is supported between each first pole post 13 and each second pole post 14. So set up, support through electrically conductive piece 15 and hold between first utmost point post 13 and second utmost point post 14, can realize the electric connection between the first electric core 11 and the second electric core 12 that correspond, so not only realized the series relation between a plurality of first electric cores 11 and a plurality of second electric cores 12, and also made each first electric core 11 and each second electric core 12 all distribute along first direction Z in proper order, also realized the range equipment between a plurality of electric cores and a plurality of die electric cores promptly.

In an embodiment, referring to fig. 1, a plurality of first battery cells 11 form a plurality of rows of first battery cells 11, the plurality of rows of first battery cells 11 are sequentially arranged along a second direction Y, and the plurality of first battery cells 11 in each row of first battery cells 11 are sequentially arranged along a third direction X. The second direction Y is parallel to the thickness direction of the first battery cell 11, the third direction X is parallel to the width direction of the first battery cell 11, and the second direction Y is perpendicular to the third direction X and is perpendicular to the first direction Z.

The plurality of second battery cells 12 form a first array group m and a second array group n, and each of the first array group m and the second array group n includes the plurality of second battery cells 12. The second cell 12 in the first array group m is opposite to two first cells 11 adjacent to each other in the third direction X, and the two first cells 11 adjacent to each other in the third direction X are connected in series through the conductive member 15. The second battery cell 12 in the second array group n faces two adjacent first battery cells 11 in the second direction Y, and two adjacent rows of the first battery cells 11 are connected in series through the conductive member 15. Therefore, by the arrangement of the second cell 12 in the first cell arrangement group m and the second cell 12 in the second cell arrangement group n, series connection between the plurality of first cells 11 is achieved, and series connection between the plurality of first cells 11 and the plurality of second cells 12 is also achieved.

It should be noted that, if the thickness direction of the second battery cells 12 in the first array group m is parallel to the second direction Y, the third direction X is parallel to the width direction of the second battery cells 12 in the first array group m. The thickness direction of the second battery cell 12 of the second arrangement group n is parallel to the third direction X, and the second direction Y is parallel to the width direction of the second battery cell 12 of the second arrangement group n. So set up for the arrangement of first electric core 11 and second electric core 12 is comparatively various, is convenient for adjust the size of electric core subassembly 10 through the mode of arranging of first electric core 11 and second electric core 12 of change to be adapted to the inner space of the shell assembly of established size better.

As shown in fig. 1, the plurality of first battery cells 11 has two rows, in each row of the first battery cells 11, two adjacent first battery cells 11 along the third direction X are directly opposite to the corresponding second battery cell 12 in the first row column group m, and are turned on by the corresponding conductive member 15. In two adjacent rows of the first battery cells 11, the first battery cell 11 at one end along the third direction X is directly opposite to the second battery cell 12 in the second arrangement group n, and is turned on through the corresponding conductive piece 15, and the first terminal 13 of the first battery cell 11 at the other end along the third direction X is the positive total output end 13a and the negative total output end 13b of the battery cell assembly 10, respectively. The number of the second arrangement groups n is one, and the first arrangement groups m and the second arrangement groups n are sequentially distributed along the third direction X.

The positive total output end 13a and the negative total output end 13b are both formed by the first electrode post 13.

Example two

The difference between the embodiment of the present application and the first embodiment is: the number of rows of the plurality of first cells 11 is different.

Referring to fig. 5, the plurality of first cells 11 has more than three rows, and based on this, the number of the second arrangement groups n is two, the two second arrangement groups n are sequentially distributed along the third direction X, and the first arrangement group m is located between the two second arrangement groups n.

As shown in fig. 5, if the number of rows of the first battery cells 11 is a double number, the total positive output end 13a and the total negative output end 13b of the battery cell assemblies 10 are located at the same end of the plurality of first battery cells 11 in the third direction X. Accordingly, when the number of rows of the first cells 11 is singular, the total positive output end 13a and the total negative output end 13b of the cell assembly 10 are respectively located at opposite ends of the plurality of first cells 11 in the third direction X.

The rest of this embodiment is the same as the first embodiment, and the unexplained features in this embodiment are explained by the first embodiment, which is not described herein again.

EXAMPLE III

The difference between the embodiment of the present application and the first embodiment is: the arrangement modes of the plurality of first battery cells 11 and the plurality of second battery cells 12 are different.

Referring to fig. 6, at least some of the first cells 11 are sequentially distributed along a second direction Y, where the second direction Y is parallel to the thickness of the first cells 11 and perpendicular to the first direction Z. The width direction of each first battery cell 11 is parallel to a third direction X, and the third direction X is perpendicular to the first direction Z and the second direction Y, respectively.

Each second electric core 12 is opposite to two first electric cores 11 adjacent to each other along the second direction Y, and two first electric cores 11 adjacent to each other along the second direction Y are connected in series through corresponding conductive pieces 15, that is, two first electric cores 11 adjacent to each other along the second direction Y and a second electric core 12 opposite to each first electric core 11 are connected in series, so that series connection between a plurality of first electric cores 11 and a plurality of second electric cores 12 can be realized. The width direction of each second battery cell 12 is parallel to the second direction Y, and the thickness direction of each second battery cell 12 is parallel to the third direction X.

A plurality of first electric cores 11 that distribute in proper order along second direction Y constitute one row of first electric core 11, and the row number of a plurality of first electric cores 11 is one row, and a plurality of first electric cores 11 are followed one of them one end of third direction X to the total output of anodal 13a of electric core subassembly 10 and the total output of negative pole 13b all locates.

The rest of this embodiment is the same as the first embodiment, and the unexplained features in this embodiment are explained by the first embodiment, which is not described herein again.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A battery device, comprising:

the battery pack comprises a battery pack assembly and a battery pack assembly, wherein the battery pack assembly comprises a first battery cell and a second battery cell, the first battery cell and the second battery cell are sequentially distributed along a first direction, a first pole column is arranged at one end of the first battery cell, which faces the second battery cell, along the first direction, a second pole column is arranged at one end of the second battery cell, which faces the first battery cell, along the first direction, and a conductive piece is abutted between the first pole column and the second pole column;

the shell assembly comprises a first shell and a second shell, and the positions of the first shell and the second shell are relatively fixed; the first casing is abutted against one end, back to the second battery cell, of the first battery cell, and the second casing is abutted against one end, back to the first battery cell, of the second battery cell.

2. The battery device according to claim 1, wherein the conductive member includes a conductive portion having an elastic property and elastically abutting between the first pole post and the second pole post.

3. The battery device of claim 2, wherein the conductive portion is a metal spring, a metal mesh, or a conductive rubber.

4. The battery device according to claim 2, wherein the conductive member further includes socket portions respectively disposed at opposite ends of the conductive portion, and the first pole post and the second pole post are respectively inserted into the socket portions at the two ends of the conductive portion.

5. The battery device of claim 4, wherein the sleeving portions at two ends respectively abut against the first battery cell and the second battery cell.

6. The battery device according to claim 4, wherein the sleeving parts have elastic properties, and the sleeving parts at both ends are elastically sleeved on the first pole and the second pole respectively.

7. The battery device according to any one of claims 1 to 6, wherein an insulating sleeve is provided around the conductive member.

8. The battery device of any of claims 1-6, wherein the first cell and the second cell are each in a plurality, the first casing abuts against the plurality of first cells, and the second casing abuts against the plurality of second cells; each second battery cell is opposite to two adjacent first battery cells along the first direction, and the two second pole posts of each second battery cell are abutted against the first pole posts of the two adjacent first battery cells in a one-to-one correspondence manner through the conductive pieces, so that the plurality of first battery cells and the plurality of second battery cells form series connection.

9. The battery device of any of claims 1-6, wherein a plurality of the first cells form a plurality of rows of the first cells arranged in sequence along a second direction, and wherein each row of the first cells is arranged in sequence along a third direction; the second direction is parallel to the thickness direction of the first battery cell, and the second direction is perpendicular to the third direction and perpendicular to the first direction;

forming a first array group and a second array group by the plurality of second cells, wherein the second cells of the first array group are right opposite to two adjacent first cells in the third direction, and forming series connection of the two adjacent first cells in the third direction through the conductive member; the second battery cells of the second array group face two adjacent first battery cells along the second direction, and the two adjacent rows of the first battery cells are connected in series through the conductive pieces.

10. The battery device of any of claims 1-6, wherein at least some of the first cells are sequentially distributed along a second direction that is parallel to a thickness of the first cells and perpendicular to the first direction; each second battery cell faces two adjacent first battery cells along the second direction, and the two adjacent first battery cells are connected in series through the conductive piece.

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