CN219739238U - Battery - Google Patents

Abstract

The utility model relates to the field of battery technology and proposes a battery pack. The battery pack includes: a first single cell and a second single cell. The first single cell is provided with a first pole assembly and a second pole assembly. , along the first direction, the orthographic projections of the first pole assembly and the second pole assembly on the same plane at least partially overlap; the first direction is the width direction of the first single cell; the first single cell and the first single cell The two single cells are arranged along a second direction, the second direction is the length direction of the first single cell, and the second direction is perpendicular to the first direction; wherein, the length of the first single cell is a, and along the second direction, The minimum distance between the first pole assembly and the second pole assembly from the end surface of the first unit cell facing the second unit cell is b, and b/a ≥ 0.05. The battery pack provided by the utility model improves the safety of the battery pack.

Description

Battery

Technical field

The utility model relates to the field of battery technology, and in particular to a battery pack.

Background technique

In the related art, a battery pack includes multiple single cells. Since the poles on the single cells are located at or too close to both ends of the length of the single cells, when multiple cells are arranged into a group, two adjacent rows of single cells will be separated. An arcing short circuit may occur at the positive output terminal of the battery, affecting the safety of the battery pack.

Utility model content

The utility model provides a battery pack, which improves the safety of the battery pack.

The utility model provides a battery pack, which includes:

A first single cell, the first single cell is provided with a first pole assembly and a second pole assembly, and along the first direction, the first pole assembly and the second pole assembly are at The orthographic projections on the same plane at least partially overlap; the first direction is the width direction of the first single cell;

A second single cell, the first single cell and the second single cell are arranged along a second direction, the second direction is the length direction of the first single cell, and the second direction is vertical in the first direction;

Wherein, the length of the first single cell is a, and along the second direction, the distance between the first pole assembly and the second pole assembly from the first single cell toward the third The minimum distance between the end faces of two single cells is b, and b/a ≥ 0.05.

In the battery pack provided by the present disclosure, the minimum distance b between the first pole assembly and the second pole assembly on the first unit cell from the end face of the first unit cell toward the second unit cell is the same as the distance b between the first unit cell and the second unit cell. The ratio of the length a is greater than or equal to 0.05. The first pole assembly and the second pole assembly on the first unit cell are at a certain distance from both ends of the length of the first unit cell, that is, the first pole on the first unit cell is The column assembly and the second pole assembly are not located at or too close to both ends of the length of the single cell. When the first single cell and the second single cell are arranged in a group, the two adjacent columns arranged along the second direction There is sufficient distance between the positive output terminals of the first single cell and the second single cell to prevent arcing short circuit, thus ensuring the safety of the battery pack.

Description of the drawings

For a better understanding of the disclosure, reference may be made to the embodiments illustrated in the following drawings. Parts in the drawings are not necessarily to scale, and relevant elements may be omitted in order to emphasize and clearly illustrate technical features of the present disclosure. Additionally, related elements or components may have different arrangements as is known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components in the respective drawings.

in:

Figure 1 is a schematic structural diagram of a battery pack according to an exemplary embodiment;

Figure 2 is a top view of a battery pack according to an exemplary embodiment;

Figure 3 is a schematic front structural view of a battery according to an exemplary embodiment;

Figure 4 is a schematic structural diagram of the reverse side of a battery according to an exemplary embodiment;

Figure 5 is a schematic diagram of a battery case according to an exemplary embodiment;

FIG. 6 is a schematic diagram of a battery core according to an exemplary embodiment.

The reference symbols are explained as follows:

10. Battery pack;

100. The first single cell; 101. The first large surface; 102. The second large surface; 103. The first small surface; 104. The second small surface; 110. Battery case; 111. The first case member; 112. Second housing member; 121. First pole assembly; 122. Second pole assembly; 130. Battery core; 131. First battery core; 1310. First battery core body; 1311. First positive electrode Ear; 1312, first negative electrode tab; 132, second battery core; 1320, second battery core body; 1321, second positive electrode tab; 1322, second negative electrode tab;

200. The second single cell; 221. The third pole assembly; 222. The fourth pole assembly.

Detailed ways

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Therefore, it should be understood that various modifications may be made to the example embodiments without departing from the scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise expressly stated and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" is refers to two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" object or "an" object are also intended to mean one of a possible plurality of such objects.

Unless otherwise specified or stated, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal. Connection; "Connection" can be a direct connection or an indirect connection through an intermediary. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

Further, in the description of the present disclosure, it should be understood that the directional terms such as “upper”, “lower”, “inner”, and “outer” described in the exemplary embodiments of the present disclosure are from the angle shown in the drawings. This description should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that when the context refers to one element or feature being connected to "on", "below", "in" or "outside" another element(s), it is not merely directly connected. "on", "below" or "inside" or "outside" another element (one or more), or can also be indirectly connected to another element (one or more) "on", "below" or "outside" through an intermediate element. inside and outside".

Embodiments of the present disclosure provide a battery pack. As shown in Figures 1 to 5, the battery pack 10 includes: a first single cell 100 and a second single cell 200. The first single cell 100 is provided with a third A pole assembly 121 and a second pole assembly 122, along the first direction Y, the orthographic projections of the first pole assembly 121 and the second pole assembly 122 on the same plane at least partially overlap, and the first direction Y is The width direction of the first single cell 100; the first single cell 100 and the second single cell 200 are arranged along the second direction X, the second direction X is the length direction of the first single cell 100, and the second direction X is vertical In the first direction Y; where the length of the first unit cell 100 is a, along the second direction The minimum distance between the end faces of the single cell 200 is b, and b/a≥0.05.

In the battery pack 10 provided by the present disclosure, the minimum distance b between the first pole assembly 121 and the second pole assembly 122 on the first unit cell 100 from the end surface of the first unit cell 100 toward the second unit cell 200 is equal to The ratio of the length a of the first unit cell 100 is greater than or equal to 0.05. The first pole assembly 121 and the second pole assembly 122 on the first unit cell 100 are at a certain distance from both ends of the length of the first unit cell 100 . , that is, the first pole assembly 121 and the second pole assembly 122 on the first single cell 100 are not located at or too close to both ends of the length of the single cell. When the first single cell 100 and the second single cell 200 are arranged When arranged into a group, there is sufficient spacing between the positive output terminals of the first unit cells 100 and the second unit cells 200 in two adjacent columns arranged along the second direction X, so that no arcing short circuit occurs, thereby ensuring The safety of the battery pack 10 is improved.

It should be noted that a single battery includes a cell and an electrolyte, and is the smallest unit capable of performing electrochemical reactions such as charging/discharging. A battery cell is a unit formed by winding or laminating stacked parts. The battery core includes a battery core body, a first pole and a second pole. The battery core body has mutually stacked first pole pieces, a second pole piece electrically opposite to the first pole piece, and a diaphragm piece disposed between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces The electrode piece and the second pole piece are stacked to form a laminated battery core. The first pole is connected to the first pole piece, the second pole is connected to the second pole piece, and the polarities of the first pole and the second pole are opposite. Optionally, the battery core may be a wound battery core, that is, a first pole piece, a second pole piece electrically opposite to the first pole piece, and a diaphragm piece disposed between the first pole piece and the second pole piece. Winding is performed to obtain a wound battery core.

In one embodiment, as shown in FIGS. 1 and 2 , the first single cell 100 and the second single cell 200 may be square cells, that is, the first single cell 100 and the second single cell 200 may be square cells. Prismatic batteries and four-prism batteries mainly refer to the shape of a prism, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense. The corners between the sides are not necessarily right angles and can be arc transitions. The quadrangular prismatic battery can be a stacked battery, which is not only convenient for grouping, but also can be processed into longer single cells.

Wherein, the length a of the first single cell 100 is ≥500mm, and the length of the first single cell 100 is, for example, 500mm, 600mm, 700mm, etc.

The length of the second unit cell 200 is the same or substantially the same as the length a of the first unit cell 100 . The length of the second single cell 200 is the same as the length of the first single cell 100, which facilitates the formation of a group between the first single cell 100 and the second single cell 200.

In one embodiment, the first direction Y is perpendicular to the second direction X, the second direction In the width direction of a single cell 100, the orthographic projections of the first pole assembly 121 and the second pole assembly 122 on the same plane at least partially overlap, and the first pole assembly 121 and the second pole assembly 122 are at a distance of The minimum distance between the end face of one single cell 100 and the second single cell 200 is basically the same; at the same time, the first pole assembly 121 and the second pole assembly 122 are arranged adjacently, which facilitates installation and improves assembly efficiency.

In one embodiment, the first single cell 100 includes a plurality of battery cells 130, and at least two battery cells 130 among the plurality of battery cells 130 are arranged along the second direction X. As shown in FIG. 6 , the first single battery 100 includes a first battery core 131 and a second battery core 132 . The first battery core 131 and the second battery core 132 are arranged along the length direction of the battery case 110 , that is, the first battery cell 131 and the second battery core 132 are arranged along the length direction of the battery case 110 . The battery core 131 and the second battery core 132 can form a structure arranged left and right, thereby increasing the overall length of the battery core 130. During the molding process of the independent first battery core 131 and the second battery core 132, the molding length can be avoided. A larger battery core 130 can not only improve the molding efficiency, but also improve the precision after molding, thereby ensuring the performance of the battery core 130 that is subsequently formed.

As shown in FIG. 6 , the first battery core 131 includes a first battery core body 1310 , a first positive electrode tab 1311 and a first negative electrode tab 1312 . The first positive electrode tab 1311 and the first negative electrode tab 1312 are arranged along the first The two directions The second negative electrode tab 1322 extends from one end of the second cell body 1320 along the second direction X.

As shown in FIG. 6 , the first positive electrode tab 1311 is electrically connected to the second positive electrode tab 1321 , and the first negative electrode tab 1312 is electrically connected to the second negative electrode tab 1322 , thereby realizing the first battery core 131 and the second negative electrode tab 1322 . The two battery cells 132 are connected in parallel, and the two electrode terminals of the battery cell 130 can be led out from the same side of the battery case 110, thereby facilitating the assembly of the battery.

It should be noted that the first positive electrode tab 1311 and the first negative electrode tab 1312 extend from one end of the first battery core body 1310 along the second direction X, and the second positive electrode tab 1321 and the second negative electrode tab 1322 extend along the second direction X. The second direction structure, but since the first positive electrode tab 1311 is electrically connected to the second positive electrode tab 1321, and the first negative electrode tab 1312 is electrically connected to the second negative electrode tab 1322, it is also possible to ensure that the tabs have sufficient overcurrent capability. Ensure the safety performance of battery use.

In one embodiment, the first positive electrode tab 1311 and the second positive electrode tab 1321 are arranged oppositely, and the first negative electrode tab 1312 and the second negative electrode tab 1322 are arranged oppositely, thereby facilitating the connection between the first positive electrode tab 1311 and the second negative electrode tab 1322 . The positive electrode tab 1321 is connected, and the first negative electrode tab 1312 and the second negative electrode tab 1322 are connected.

The first positive electrode tab 1311 and the second positive electrode tab 1321 are arranged oppositely. When the first positive electrode tab 1311 is flattened, the flattened first positive electrode tab 1311 is at least partially projected along the flattened second positive electrode tab 1321. Located on the second positive electrode tab 1321. The first negative electrode tab 1312 and the second negative electrode tab 1322 are arranged oppositely. When the first negative electrode tab 1312 is flattened, the flattened first negative electrode tab 1312 is at least partially projected along the flattened second negative electrode tab 1322. Located on the second negative electrode tab 1322.

The first positive electrode tab 1311 and the second positive electrode tab 1321 are arranged oppositely. It can be considered that the end of the first positive electrode tab 1311 is directly opposite to the end of the second positive electrode tab 1321. At this time, the first positive electrode tab 1311 The end of the positive electrode tab 1321 can be spaced apart from the end of the second positive electrode tab 1321. The first positive electrode tab 1311 and the second positive electrode tab 1321 are electrically connected through an adapter piece or a pole assembly, or the first positive electrode tab 1311 The end of the second positive electrode tab 1321 can be connected with the end of the second positive electrode tab 1321 . Alternatively, the first positive electrode tab 1311 and the second positive electrode tab 1321 are arranged oppositely. It can be considered that the part of the first positive electrode tab 1311 overlaps the part of the second positive electrode tab 1321, so that the first positive electrode tab 1311 It is electrically connected to the second positive electrode tab 1321.

Correspondingly, the first negative electrode tab 1312 and the second negative electrode tab 1322 are arranged oppositely. It can be considered that the end of the first negative electrode tab 1312 and the end of the second negative electrode tab 1322 are directly opposite. Alternatively, it can be considered that the portion of the first negative electrode tab 1312 overlaps the portion of the second negative electrode tab 1322 .

In one embodiment, along the first direction Y, the orthographic projections of the first pole assembly 121 and the second pole assembly 122 on the same plane completely overlap, that is, between the first pole assembly 121 and the second pole assembly 121 The minimum distance between 122 and the end face of the first unit cell 100 toward the second unit cell 200 is the same. The first pole assembly 121 and the second pole assembly 122 are located at the same position in the length direction of the first unit cell 100. When installed Convenient and can improve assembly efficiency.

In one embodiment, b/a≥0.2, the distance between the first pole assembly 121 and the second pole assembly 122 on the first unit cell 100 is from the end surface of the first unit cell 100 toward the second unit cell 200 The ratio of the minimum distance b to the length a of the first unit cell 100 is greater than or equal to 0.2, and the distance between the first pole assembly 121 and the second pole assembly 122 on the first unit cell 100 and both ends of the length of the first unit cell 100 To further increase, when the first unit cells 100 and the second unit cells 200 are arranged in a group, the distance between the first unit cells 100 and the second unit cells 200 in two adjacent columns arranged along the second direction There is a larger distance between the positive output terminals, which further avoids arcing short circuit and further ensures the safety of the battery pack 10 .

In one embodiment, b/a≥0.5, the distance between the first pole assembly 121 and the second pole assembly 122 on the first unit cell 100 is from the end surface of the first unit cell 100 toward the second unit cell 200 The ratio of the minimum distance b to the length a of the first unit cell 100 is equal to 0.5, that is, along the second direction X, the first pole assembly 121 and the second pole assembly 122 are disposed in the central area of the first unit cell 100 . By arranging the first pole assembly 121 and the second pole assembly 122 in the central area of the first single cell 100, there is sufficient spacing between the pole assemblies of adjacent single cells, and at the same time, it is convenient to install the battery. Two battery cores 130 with the same length are disposed in the housing 110 .

In one embodiment, as shown in FIGS. 4 and 5 , the battery case 110 of the first single cell 100 includes two opposite first surfaces and four second surfaces arranged around the first surfaces. The first surface The area is greater than the area of the second surface. It should be noted that the two opposite first surfaces are the first large surface 101 and the second large surface 102 of the battery case 110, and the four second surfaces are small surfaces of the battery case 110. The four second surfaces are It includes two pairs of small surfaces, namely a pair of first small surfaces 103 extending along the length direction of the battery case 110, and a pair of second small surfaces 104 extending along the width direction of the battery case 110, and the first small surfaces 103 The area of is larger than the area of the second small surface 104, but smaller than the area of the large surface.

In one embodiment, the first pole assembly 121 and the second pole assembly 122 are disposed on the same surface of the first unit cell 100 , that is, on the first large surface 101 . By disposing the first pole assembly 121 and the second pole assembly 122 on the same surface of the first unit cell 100, installation is easy and assembly efficiency can be improved. Of course, the first pole assembly 121 and the second pole assembly 122 are disposed on different surfaces of the first unit cell 100, and this disclosure is not limiting.

Among them, the first pole assembly 121 and the second pole assembly 122 are arranged on a large surface, thereby ensuring that the first pole assembly 121 and the second pole assembly 122 have a reliable supporting surface, thereby ensuring that the first pole assembly 121 and the second pole assembly 122 have a reliable supporting surface. Stability of post assembly 121 and second pole assembly 122.

In one embodiment, as shown in FIG. 5 , the battery case 110 of the first single cell 100 includes: a first case part 111 and a second case part 112 , and the second case part 112 is connected to the first case part 111 . 111 is connected. Among them, the first housing part 111 is a flat plate, and the second housing part 112 is in the shape of a box, forming a receiving cavity, and the battery core 130 is located in the cavity. The first housing part 111 and the second housing part 112 are provided independently, which can facilitate the installation of the battery core 130 and facilitate processing.

In one embodiment, the battery pack 10 includes a plurality of first single cells 100, the plurality of first single cells 100 are arranged along a third direction Z, the third direction Z is perpendicular to the first direction Y, and the third direction Z is perpendicular to In the second direction The plurality of second unit cells 200 are arranged along the third direction Z. The third direction Z is the thickness direction of the second unit cell 200 . The plurality of second unit cells 200 are stacked in the thickness direction. Since the positive output terminals of the first unit cell 100 and the second unit cell 200 that are arranged on the same layer and are adjacent to each other have a large distance, arcing short circuits are avoided and the safety of the battery pack 10 is ensured.

The third direction Z is perpendicular to the large surface of the first single cell 100 . When a plurality of first unit cells 100 and a plurality of second unit cells 200 are stacked to form the battery pack 10, the largest surfaces of the plurality of first unit cells 100 are stacked together, and the plurality of second unit cells 100 are stacked together. The largest surfaces of the two single cells 200 are stacked together, that is, the stacking direction of multiple single cells is perpendicular to the large surface of the single cells. By stacking multiple single cells in a direction perpendicular to the large surface of the battery, the space occupied by multiple single cells after being stacked can be smaller, thereby relatively improving the energy density of multiple single cells in a group.

In one embodiment, a plurality of first unit cells 100 are connected in series along the third direction Z. When multiple first single cells 100 are connected in series, the voltages of the multiple first single cells 100 are accumulated. Therefore, the voltage of the battery pack formed by the multiple first single cells 100 connected in series is relatively higher than that of the battery pack connected in parallel. , thus leading to a greater risk of arcing short circuit between the battery closest to the positive output terminal among the plurality of first single cells 100 and its adjacent second single battery 200. This application makes the first single battery and There is sufficient spacing between the positive output terminals of the second single cells to avoid arcing short circuits and ensure safety when multiple first single cells 100 are connected in series in the battery pack.

In one embodiment, along the third direction Z, the orthographic projections of the two first pole assemblies 121 of the two adjacent first unit cells 100 on the same plane at least partially overlap, that is, in the first unit In the thickness direction of the battery 100, the two first pole assemblies 121 of two adjacent first unit cells 100 are aligned or substantially aligned, thereby facilitating the busbar to connect the two adjacent first unit cells 100 at the same time. With a first pole assembly 121, the busbar is easy to install and can improve assembly efficiency.

In one embodiment, along the third direction Z, among two adjacent first unit cells 100 , the first pole assembly 121 of one first unit cell 100 and the first pole assembly 121 of the other first unit cell 100 The orthographic projections of the second pole assembly 122 on the same plane at least partially overlap, that is, in the thickness direction of the first unit cell 100 , among the two adjacent first unit cells 100 , one first unit cell 100 The first pole assembly 121 and the second pole assembly 122 of another first unit cell 100 are aligned or substantially aligned, thereby facilitating the busbar to simultaneously connect the first poles of two adjacent first unit cells 100 Assembly 121 and the second pole assembly 122, the busbar is easy to install and can improve assembly efficiency.

In one embodiment, the second single cell 200 is provided with a third pole assembly 221 and a fourth pole assembly 222 with opposite polarities, and the first pole assembly 121 and the third pole assembly 221 have the same polarity. , the second pole assembly 122 and the fourth pole assembly 222 have the same polarity. For example, the first pole assembly 121 and the third pole assembly 221 are both positive pole assemblies, and the second pole assembly 122 and the fourth pole assembly 222 are both negative pole assemblies; or, the first pole assembly 121 and the third pole assembly 221 are both negative pole assemblies, and the second pole assembly 122 and the fourth pole assembly 222 are both positive pole groups.

Wherein, along the second direction The first single cell 100 and the second single cell 200 are on the same side in the width direction, the positive pole assembly of the first single cell 100 and the second single cell 200 are on the same side in the width direction, and the negative pole assembly is on same side in the width direction. Alternatively, along the second direction One single cell 100 and the second single cell 200 are on the same side in the width direction, and the positive pole assembly of the first single cell 100 and the negative pole assembly of the second single cell 200 are on the same side in the width direction, The negative pole assembly of the first unit cell 100 and the positive pole assembly of the second unit cell 200 are located on the same side in the width direction.

In one embodiment, the first single cell 100 and the second single cell 200 can be two identical single cells, that is, formed by the same production equipment and production process, thereby reducing the manufacturing cost of the single cells. cost, thereby reducing the manufacturing cost of the battery pack 10.

In one embodiment, the battery pack 10 is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may also include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

It should be noted that multiple batteries can be formed into a battery module and placed in the battery box, and the multiple batteries can be fixed through end plates and side plates. Multiple batteries can be directly installed in the battery box, that is, there is no need to group multiple batteries. At this time, the end plates and side plates can be removed.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present disclosure and include common knowledge or customary techniques in the technical field that are not disclosed in the present disclosure. means. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (12)

1. A battery pack, comprising:

the battery pack comprises a first single battery (100), wherein a first pole assembly (121) and a second pole assembly (122) are arranged on the first single battery (100), and orthographic projections of the first pole assembly (121) and the second pole assembly (122) on the same plane are at least partially overlapped along a first direction; the first direction is the width direction of the first single battery (100);

the first single batteries (100) and the second single batteries (200) are arranged along a second direction, wherein the second direction is the length direction of the first single batteries (100), and the second direction is perpendicular to the first direction;

the length of the first single battery (100) is a, the minimum distance between the first pole assembly (121) and the second pole assembly (122) along the second direction, which is from the first single battery (100) to the end face of the second single battery (200), is b, and b/a is more than or equal to 0.05.

2. The battery of claim 1, wherein b/a is ≡0.2.

3. The battery pack according to claim 1, wherein the first and second pole assemblies (121, 122) are disposed on the same surface of the first unit cell (100).

4. A battery according to claim 3, wherein the first pole assembly (121) and the second pole assembly (122) are disposed on a large surface of the first unit cell (100).

5. The battery pack according to claim 1, wherein the first and second post assemblies (121, 122) are disposed at a central region of the first unit cell (100) in the second direction.

6. The battery according to claim 1, characterized in that in the first direction, the orthographic projections of the first pole assembly (121) and the second pole assembly (122) on the same plane are completely coincident.

7. The battery pack according to any one of claims 1 to 6, wherein the first unit cells (100) are plural, and the plural first unit cells (100) are arranged in a third direction perpendicular to the first direction, the third direction is perpendicular to the second direction, and the third direction is perpendicular to a large surface of the first unit cell (100);

the number of the second single batteries (200) is plural, and the plurality of the second single batteries (200) are arranged along the third direction.

8. The battery pack according to claim 7, wherein a plurality of the first unit cells (100) are sequentially connected in series in the third direction.

9. The battery pack according to claim 7, wherein the orthographic projections of two first pole assemblies (121) of two adjacent first single cells (100) on the same plane at least partially coincide in the third direction;

or, in the third direction, orthographic projections of the first pole component (121) of one first single battery (100) and the second pole component (122) of the other first single battery (100) on the same plane at least partially coincide in two adjacent first single batteries (100).

10. The battery pack according to any one of claims 1 to 6, wherein a third pole assembly (221) and a fourth pole assembly (222) having opposite polarities are provided on the second unit cell (200), the polarities of the first pole assembly (121) and the third pole assembly (221) are the same, and the polarities of the second pole assembly (122) and the fourth pole assembly (222) are the same;

wherein, in the second direction, the orthographic projections of the first pole assembly (121) and the third pole assembly (221) on the same plane are at least partially overlapped, or, in the second direction, the orthographic projections of the first pole assembly (121) and the fourth pole assembly (222) on the same plane are at least partially overlapped.

11. The battery pack according to any one of claims 1 to 6, wherein the first unit cell (100) includes a plurality of battery cells (130), at least two of the battery cells (130) of the plurality of battery cells (130) being disposed along the second direction.

12. The battery according to any one of claims 1 to 6, wherein a is equal to or greater than 500mm.