Battery pack

Abstract

The utility model discloses a battery pack, which comprises a battery cell body, a battery pack and a battery pack, the protection plate comprises a first surface and a second surface which are oppositely arranged, the first surface is opposite to the battery cell body, and a connector, a component group and a conducting strip are arranged on the protection plate; the component group is arranged on the second surface, and the connector and the conducting strip are arranged on the first surface; wherein the tab is connected with the conducting strip. The problem that a connector and an electronic component group are arranged on the same surface of a protection plate in the prior art, the structure is compact, and heat dissipation of the component group is not facilitated is solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell tab welding, and more specifically, to a battery pack. Background Art

[0002] In the design of soft-pack batteries, the power supply is connected by welding the tabs and the connecting pieces on the protection board. The material of the connecting pieces may be copper, nickel or steel. Taking the nickel sheet as an example, the protection board must meet the reasonable layout of the component group and the reasonable position of the nickel sheet.

[0003] In the existing technology of components, components and connectors for connecting to electrical equipment are usually arranged on one mounting surface of the protection board, and nickel sheets are arranged on the other mounting surface, and then the tabs and nickel sheets are welded. However, in the design of small battery structures, in order to meet the fast charging capacity of the battery, the components are usually large and numerous, which affects the miniaturization design of the protection board; in addition, the connectors and components are arranged on the same surface, which aggravates the space shortage and also affects the heat dissipation of the components, thereby affecting the heat dissipation performance of the entire battery. Utility Model Content

[0004] The main purpose of the present application is to provide a battery pack to solve the problem in the prior art that the connector and the electronic component group are arranged on the same surface of the protection board, the structure is compact, and it is not conducive to the heat dissipation of the component group.

[0005] According to one aspect of the present application, a battery pack is provided, including: a battery cell body, on which a pole ear is arranged; a protective plate, the protective plate including a first surface and a second surface arranged opposite to each other, the first surface is opposite to the battery cell body, and a connector, a component group and a conductive sheet are arranged on the protective plate; the component group is arranged on the second surface, and the connector and the conductive sheet are arranged on the first surface; wherein the pole ear is connected to the conductive sheet.

[0006] Furthermore, the conductive sheet includes a first conductive sheet and a second conductive sheet, and the connector, the first conductive sheet and the second conductive sheet are sequentially spaced apart along the width direction of the protection plate.

[0007] Furthermore, the first conductive sheet includes: a first connecting section and a second connecting section, the first connecting section is connected to the pole ear, the second connecting section is connected to the protection plate, and the first connecting section and the second connecting section are connected via a bending section.

[0008] Furthermore, the battery cell body includes a first battery cell body and a second battery cell body arranged opposite to each other, the first battery cell body is provided with a first pole ear, and the second battery cell body is provided with a second pole ear; the first pole ear is connected to the first connecting section, the second pole ear is connected to the second conductive sheet, and at least part of the connector is located on the side of the first battery cell body away from the second battery cell body.

[0009] Furthermore, the thickness of the second conductive sheet is greater than the thickness of the first conductive sheet.

[0010] Furthermore, the thickness of the second conductive sheet is H1, 0.2 mm≤H1≤0.8 mm.

[0011] Furthermore, the thickness of the first conductive sheet is H2, 0.1 mm ≤ H2 ≤ 0.2 mm.

[0012] Furthermore, the first connecting section and the second connecting section are arranged opposite to each other and spaced apart.

[0013] Furthermore, the included angle between the first connecting section and the second connecting section is C, 0°≤C≤20°.

[0014] Furthermore, the first connecting section, the second connecting section and the bending section are an integrally formed structure, and the bending section extends along an arc track; at least a portion of the pole ear can be bent.

[0015] Compared with the prior art, the technical solution of this application has at least the following technical effects:

[0016] According to the battery pack provided in the present application, the component group is arranged on the second surface of the protection plate away from the battery cell body, the connector and the conductive sheet are arranged on the first surface of the protection plate opposite to the battery cell body, and the pole ear is connected to the conductive sheet. This can provide an installation space for the component group. Since the component group is away from the battery cell body, the heat dissipated by the battery cell body is avoided from being transferred to the component group, which is beneficial to the heat dissipation of the component group and improves the cycle performance and service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a schematic diagram of welding the tab and the nickel sheet in the prior art;

[0019] Figure 2 This is a schematic structural diagram of the first embodiment of the battery pack of the present application;

[0020] Figure 3 This is a structural exploded diagram of the first embodiment of the battery pack of the present application;

[0021] Figure 4 This is a schematic structural diagram of a second embodiment of the battery pack of the present application;

[0022] Figure 5 This is a structural explosion diagram of a second embodiment of the battery pack of the present application;

[0023] Figure 6 This is a schematic diagram of the assembly of the first conductive sheet in the battery pack of the present application;

[0024] Figure 7 A partial enlarged view of the battery pack of the present application;

[0025] Figure 8 A diagram showing the welding state of the first conductive sheet and the first tab in the battery pack of the present application;

[0026] Fig. 9 for Figure 8 A magnified view of part D in the middle;

[0027] Fig.10 A diagram showing the welding state of the second conductive sheet and the second tab in the battery pack of the present application;

[0028] Fig.11 for Fig.10 Enlarged view of part E.

[0029] The above drawings include the following reference numerals:

[0030] 1. Battery cell body; 2. Tab; 3. Protection plate; 31. First surface; 32. Second surface; 4. Connector; 5. First conductive sheet; 51. First connecting section; 52. Second connecting section; 53. Bend section; 6. Second conductive sheet; 11. First battery cell body; 12. Second battery cell body; 21. First tab; 22. Second tab; 23. First body; 24. Second body. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] As mentioned in the background technology, the existing soft-pack batteries are designed to be miniaturized, but at the same time they need to meet the fast charging capability. Usually, the components are large in size and large in number. They are installed on the same surface of the protection board with a compact structure and poor heat dissipation function. In order to solve the above technical problems, the present application provides a battery pack, the protection board 3 includes a first surface 31 and a second surface 32 arranged opposite to each other, the first surface 31 is opposite to the battery body 1, and the protection board 3 is provided with a connector 4, a component group and a conductive sheet; the component group is arranged on the second surface 32, the connector 4 and the conductive sheet are arranged on the first surface 31, and the pole ear 2 is connected to the conductive sheet. In this way, the component group and the connector 4 and the conductive sheet are arranged on different surfaces of the protection board 3, respectively, providing sufficient installation space for each component in the component group, and the components are away from the battery body 1, and the heat emitted by the battery body 1 will not be transferred to the components. Therefore, it is beneficial to accelerate the heat dissipation of the components and improve the cycle performance and service life of the battery.

[0035] See also Figures 2 to 11 As shown, the present application provides a battery pack, including: a battery cell body 1, on which a pole ear 2 is arranged; a protective plate 3, the protective plate 3 includes a first surface 31 and a second surface 32 arranged opposite to each other, the first surface 31 is opposite to the battery cell body 1, and a connector 4, a component group and a conductive sheet are arranged on the protective plate 3; the component group is arranged on the second surface 32, and the connector 4 and the conductive sheet are arranged on the first surface 31; wherein the pole ear 2 is connected to the conductive sheet.

[0036] The battery pack provided by the present application includes a battery cell body 1 and a protective plate 3, wherein the battery cell body 1 is provided with a pole ear 2, and the protective plate 3 includes a first surface 31 and a second surface 32 arranged opposite to each other, wherein the first surface 31 is opposite to the battery cell body 1, and the protective plate 3 is provided with a connector 4, a component group and a conductive sheet; the component group is arranged on the second surface 32, and the connector 4 and the conductive sheet are arranged on the first surface 31; wherein the pole ear 2 is connected to the conductive sheet. By respectively arranging the component group and the connector on different surfaces of the protective plate 3, sufficient installation space is provided for the component group. Specifically, each component in the component group is respectively arranged on the second surface 32 of the protective plate 3 away from the battery cell body 1, and the heat emitted by the battery cell body 1 has less influence on each component, which is beneficial to the heat dissipation of each component group, and improves the cycle performance and service life of the battery pack.

[0037] It should be noted here that the component group includes a variety of high-power devices and resistor elements. Each high-power device and device with large heat generation is arranged on the second surface 32, away from the battery body 1, and some resistor elements are arranged on the first surface 31 to optimize the overall layout of each component on the protection plate 3.

[0038] The conductive sheet includes a first conductive sheet 5 and a second conductive sheet 6, and the connector 4, the first conductive sheet 5 and the second conductive sheet 6 are sequentially arranged at intervals along the width direction of the protection plate 3. In this way, when the first conductive sheet 5 and the second conductive sheet 6 are connected to the corresponding tabs respectively, the connector 4 is prevented from causing obstacles to the first conductive sheet 5 and the second conductive sheet 6.

[0039] In the embodiment provided by the present application, since the connector 4 and the first conductive sheet 5 and the second conductive sheet 6 are respectively located on the first surface 31 of the protection plate 3, the first conductive sheet 5 includes: a first connecting section 51 and a second connecting section 52, the first connecting section 51 is connected to the pole lug 2, the second connecting section 52 is connected to the protection plate 3, and the first connecting section 51 and the second connecting section 52 are connected by a bending section 53. By connecting the bending section 53 to the first connecting section 51 and the second connecting section 52, the bending section 53 is arranged to be bendable, so that the first conductive sheet 5 has a bendable performance, so that the angle between the first connecting section 51 and the second connecting section 52 can be adjusted according to actual needs, and in the process of welding the first conductive sheet 5 and the pole lug 2, the position of the first conductive sheet 5 can be adjusted after the first connecting section 51 and the pole lug 2 are welded together, which is convenient to operate and solves the problem that when the connector 4 and the first conductive sheet 5 are on the same mounting surface of the protection plate 3, it is inconvenient to weld the pole lug 2 and the first conductive sheet 5. Compared with the prior art, the first conductive sheet 5, the second conductive sheet 6 and the connector 4 are located in different planes (such as Figure 1As shown in the figure, during the production line operation, the protection plate 3 needs to be turned over and placed in a jig for welding. In order to provide sufficient installation space for components, the connector 4 and the conductive sheet are arranged in the same plane, and the first conductive sheet 5 is bent. During the welding process, the shape of the first conductive sheet 5 can be adjusted according to actual needs to eliminate the obstacle caused by the connector 4 that the discharge core body 1 cannot be laid flat, resulting in the first conductive sheet 5 being unable to be welded with the tab 2.

[0040] Specifically, the cell body 1 includes a first cell body 11 and a second cell body 12 that are arranged opposite to each other, a first pole tab 21 is arranged on the first cell body 11, and a second pole tab 22 is arranged on the second cell body 12; the first pole tab 21 is connected to the first connecting section 51, and the second pole tab 22 is connected to the second conductive sheet 6, and at least part of the connector 4 is located on the side of the first cell body 11 away from the second cell body 12. During the assembly process, the first pole tab 21 is first welded to the first connecting section 51, and after the welding is completed, the first conductive sheet 5 is bent, that is, the angle between the first connecting section 51 and the second connecting section 52 is adjusted by using the bending section 53, so as to avoid interference with the welding of the second pole tab 22 and the second conductive sheet 6.

[0041] Furthermore, the thickness of the second conductive sheet 6 is greater than that of the first conductive sheet 5. The second conductive sheet 6 is welded to the second electrode tab 22 after being bonded together. Therefore, setting the thickness of the second conductive sheet 6 to be greater than that of the first conductive sheet 5 can prevent the second conductive sheet 6 from being broken down during the welding process, thereby preventing the laser welding from damaging the components in the component group.

[0042] In the specific implementation process, the thickness of the second conductive sheet 6 is H1, 0.2mm≤H1≤0.8mm. The thickness of the first conductive sheet 5 is H2, 0.1mm≤H2≤0.2mm. If the thickness of the second conductive sheet 6 is too small, it is easy to be punctured during the welding process, causing damage to the protection plate 3; if the thickness of the second conductive sheet 6 is too large, it occupies the installation space. The thickness of the first conductive sheet 5 is limited so that the first conductive sheet 5 has a sufficient number of bending times; if H2 is too small, the thickness of the first conductive sheet 5 is too thin, the structural strength is low, and it is easy to break during the bending process; if H2 is too large, the thickness of the first conductive sheet 5 is too thick, the structural strength is too large, and the bending difficulty is increased.

[0043] In one embodiment provided in the present application, the first connecting segment 51 and the second connecting segment 52 are arranged oppositely and at intervals. In this way, a certain spacing distance is left between the first connecting segment 51 and the second connecting segment 52, which provides space for the subsequent adjustment of the position of the first pole ear 21 or the position of the first connecting segment 51, so that the adjustment of the first conductive sheet 5 is more flexible and adaptable to different needs. In another embodiment provided in the present application, the angle between the first connecting segment 51 and the second connecting segment 52 is C, 0°≤C≤20°. At this time, the first conductive sheet 5 is in a folded position. Preferably, the first connecting segment 51 and the second connecting segment 52 are parallel to each other, and C is 0°. In this way, the first conductive sheet 5 is completely folded, and the first connecting segment 51 and the second connecting segment 52 are connected by the bending segment 53, and the first battery body 11 and the second battery body 12 are stacked and fixed, or there is an angle between the first connecting segment 51 and the second connecting segment 52, which is convenient for shaping and bending the first pole ear 21 and the second pole ear 22 to complete the assembly.

[0044] In the specific implementation, in the specific implementation process, the first connecting section 51, the bending section 53 and the second connecting section 52 are an integrally formed structure; the bending section 53 extends along an arc trajectory; at least a portion of the pole ear 2 is bendably arranged. The first connecting section 51, the bending section 53 and the second connecting section 52 are an integrally formed structure, which can ensure the structural strength of the first conductive sheet 5. At the same time, the bending section 53 extending along an arc trajectory can avoid stress concentration areas in the first conductive sheet 5 during the bending process, thereby preventing the first conductive sheet 5 from being easily broken during repeated bending. At least a portion of the pole ear 2 is bendably arranged, which facilitates the shaping of the pole ear 2 during the assembly process to meet the assembly requirements of the battery pack.

[0045] In the specific implementation process, Fig.10 and Fig.11 As shown, the angle between the first connecting section 51 and the second connecting section 52 is B, 30°≤B≤50°, at this time, the first conductive sheet 5 avoids the welding of the second conductive sheet 6, and the second conductive sheet 6 is welded to the second pole tab 22. After the first conductive sheet 5 is welded to the first pole tab 21, the first connecting section 51 drives the first pole tab 21 to be bent toward the direction close to the connector 4, so that the second conductive sheet 6 is avoided on the side of the first connecting section 51 away from the connector 4, which facilitates the welding of the second conductive sheet 6 and the second pole tab 22.

[0046] Furthermore, if Figure 8 and Fig. 9As shown, the angle between the first connecting segment 51 and the second connecting segment 52 is A, 80°≤A≤100°, the first connecting segment 51 is welded to the pole tab 2, when the angle between the first connecting segment 51 and the second connecting segment 52 is A, the first connecting segment 51 is welded to the pole tab 2, during which the first pole tab 21 can be welded to the first connecting segment 51 overlapping each other, increasing the contact area between the first pole tab 21 and the first connecting segment 51, thereby improving the connection strength between the first pole tab 21 and the first conductive sheet 5. Preferably, A is 90°.

[0047] After the actual assembly is completed, Figure 6 and Figure 7 As shown, the included angle between the first connecting section 51 and the second connecting section 52 is C, 0°≤C≤10°. At this time, the first conductive sheet 5 is in the final state of assembly.

[0048] In the actual assembly process, the tab 2 includes: a first body 23 and a second body 24 connected to each other, the first body 23 is connected to the battery body 1, and the second body 24 is connected to the first connecting section 51; wherein the second body 24 is bendably arranged relative to the first body 23. After the second body 24 and the first connecting section 51 are welded, the second body 24 is bent relative to the first body 23 along with the first connecting section 51 according to the actual assembly requirements, thereby improving the flexibility of the assembly position and assembly posture of the tab 2.

[0049] Furthermore, if Figure 8 and Fig. 9 As shown, the surface of the first body 23 and the surface of the second body 24 are located in the same plane, the tab 2 is in the initial state, and the range of the angle A between the first connecting segment 51 and the second connecting segment 52 is 80°≤A≤100°; at this time, the second body 24 is welded to the first connecting segment 51. Preferably, when the angle A is 90°, the surface of the first body 23 and the surface of the second body 24 are located in the same plane, which facilitates the welding of the second body 24 and the first connecting segment 51.

[0050] In actual application, the second surface 32 of the protection plate 3 is covered with component groups, and due to the limited installation area of ​​the protection plate 3, the pole ear 2 can only be welded on the first surface 31 of the protection plate 3; therefore, the present application adopts an L-shaped first conductive sheet 5 for auxiliary welding, and the first conductive sheet 5, the second conductive sheet 6 and the connector 4 are respectively arranged on the first surface 31 of the protection plate 3, which not only makes the device layout on the protection plate 3 more reasonable, but also facilitates the heat dissipation of each component on the second surface 32. In addition, in order to avoid the influence of the connector 4 on the welding of the pole ear 2, the first conductive sheet 5 is arranged to be bendable. In order to ensure a sufficient number of bending times, the thickness H2 of the first conductive sheet 5 is in the range of 0.1mm≤H2≤0.2mm. In order to prevent the laser from damaging the component group on the protection plate, the thickness H1 of the second conductive sheet 6 is in the range of 0.2mm≤H1≤0.8mm. The whole assembly process is as follows:

[0051] After the first conductive sheet 5 is fixed on the protection plate 3 in an L-shaped structure and the second conductive sheet 6 is fixed on the protection plate 3, the first cell body 11 and the protection plate 3 are connected in an L-shaped structure. Figure 8 and Fig. 9 The jig is placed in the state shown in the figure. At this time, the first pole ear 21 is fitted with the first connecting section 51. The first pole ear 21 and the first conductive sheet 5 are pressed tightly by the jig and then welded. At this time, the first conductive sheet 5 is still in an L-shaped structure. After welding, the first battery body 11 and the protection plate 3 are turned over, as shown in FIG. Fig.10 and Fig.11 As shown, the first cell body 11 above the connector 4 is supported and fixed by a jig to facilitate welding of the second conductive sheet 6 and the second pole ear 22. During this process, the first connecting section 51 is bent relative to the second connecting section 52, and the angle between the first connecting section 51 and the second connecting section 52 is B. After the second conductive sheet 6 is welded, the second conductive sheet 6 is further folded, and the folding angle is above 170°, which is close to fitting. Figure 6 and Figure 7 As shown, the angle between the first connecting section 51 and the second connecting section 52 is C. In this process, when the second conductive sheet 6 is welded, the jig only needs to press the first pole ear 21 and the first conductive sheet 5, and there is no need to press the protective plate 3, which can effectively avoid the damage of the protective plate components caused by the pressure of the jig during welding. After the pole ears are welded, the two cells are stacked and fixed, and the first pole ear 21, the second pole ear 22, the first conductive sheet 5 and the second conductive sheet 6 are shaped and bent respectively to complete the assembly, as shown in FIG. Figure 2 or Figure 4At this time, after the first conductive sheet 5 is folded, it allows multiple opening and closing movements within 20°, which can effectively increase the activity space of the tab, thereby reducing the risk of damage to the tab and the welding point by mechanical vibration. The first conductive sheet 5 with a bendable design solves the problem of obstacles on the protection plate that are difficult to weld with the tab, without changing the shape of the protection plate and meeting the actual needs.

[0052] In the first embodiment provided in this application, Figure 2 and Figure 3 As shown, the grooves at the top of the two battery cells are opposite to each other, or in the second embodiment provided in the present application, as Figure 4 and Figure 5 As shown, the protruding flange edges at the top of the two battery cell bodies are opposite to each other. The position and state of the battery cell body are adjusted according to the different orientations of the positive and negative poles of the battery output. The above two embodiments are applicable to the connection method between the first conductive sheet 5 and the pole ear in the above embodiments.

[0053] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0054] The battery pack provided by the present application includes a battery cell body 1 and a protective plate 3, wherein the battery cell body 1 is provided with a pole ear 2, and the protective plate 3 includes a first surface 31 and a second surface 32 arranged opposite to each other, wherein the first surface 31 is opposite to the battery cell body 1, and the protective plate 3 is provided with a connector 4, a component group and a conductive sheet; the component group is arranged on the second surface 32, and the connector 4 and the conductive sheet are arranged on the first surface 31; wherein the pole ear 2 is connected to the conductive sheet. By respectively arranging the component group and the connector on different surfaces of the protective plate 3, sufficient installation space is provided for the component group. Specifically, each component in the component group is respectively arranged on the second surface 32 of the protective plate 3 away from the battery cell body 1, and the heat emitted by the battery cell body 1 has less influence on each component, which is beneficial to the heat dissipation of each component group and improves the service life of the battery pack.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0057] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell body (1), wherein a pole lug (2) is provided on the battery cell body (1); A protection plate (3), the protection plate (3) comprising a first surface (31) and a second surface (32) arranged opposite to each other, the first surface (31) being opposite to the battery cell body (1), and a connector (4), a component group and a conductive sheet being arranged on the protection plate (3); The component group is arranged on the second surface (32), and the connector (4) and the conductive sheet are arranged on the first surface (31); wherein the tab (2) is connected to the conductive sheet.

2. The battery pack according to claim 1, characterized in that: The conductive sheet comprises a first conductive sheet (5) and a second conductive sheet (6), and the connector (4), the first conductive sheet (5) and the second conductive sheet (6) are sequentially arranged at intervals along the width direction of the protection plate (3).

3. The battery pack according to claim 2, characterized in that: The first conductive sheet (5) comprises: A first connecting section (51) and a second connecting section (52), wherein the first connecting section (51) is connected to the pole lug (2), and the second connecting section (52) is connected to the protection plate (3), and the first connecting section (51) and the second connecting section (52) are connected via a bending section (53).

4. The battery pack according to claim 3, characterized in that: The battery cell body (1) comprises a first battery cell body (11) and a second battery cell body (12) which are arranged opposite to each other, the first battery cell body (11) is provided with a first pole lug (21), and the second battery cell body (12) is provided with a second pole lug (22); The first pole lug (21) is connected to the first connecting section (51), the second pole lug (22) is connected to the second conductive sheet (6), and at least a portion of the connector (4) is located on a side of the first battery cell body (11) away from the second battery cell body (12).

5. The battery pack according to claim 2 or 4, characterized in that: The thickness of the second conductive sheet (6) is greater than the thickness of the first conductive sheet (5).

6. The battery pack according to claim 2, characterized in that: The thickness of the second conductive sheet (6) is H1, 0.2 mm ≤ H1 ≤ 0.8 mm.

7. The battery pack according to claim 2, characterized in that: The thickness of the first conductive sheet (5) is H2, 0.1 mm ≤ H2 ≤ 0.2 mm.

8. The battery pack according to claim 3, characterized in that: The first connecting section (51) and the second connecting section (52) are arranged opposite to each other and spaced apart.

9. The battery pack according to claim 3, characterized in that: The included angle between the first connecting section (51) and the second connecting section (52) is C, 0°≤C≤20°.

10. The battery pack according to claim 3, characterized in that: The first connecting section (51), the second connecting section (52) and the bending section (53) are an integrally formed structure, and the bending section (53) extends along an arc track; and / or, At least a portion of the pole lug (2) is arranged to be bendable.

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