Battery monomer and battery pack

Abstract

The utility model relates to a battery monomer and a battery pack, which comprise a shell with an accommodating cavity and a cover plate, and a first side plate and a third side plate which are oppositely arranged along a second direction; the battery cell is accommodated in the accommodating cavity; the battery cell comprises a battery cell main body and a tab, and the battery cell main body is provided with a first end face facing the cover plate; the tab comprises a leading-out part and a bending part, the leading-out part is led out from the first end surface of the battery cell main body, and the bending part is connected with the leading-out part; wherein the cover plate is provided with a first end far away from the bending part and a second end far away from the first end in the second direction, the first side plate is connected with the first end of the cover plate, and the third side plate is connected with the second end of the cover plate; the distance between the first end and the first end face is smaller than the distance between the second end and the first end face. The internal space utilization rate of the whole battery pack is ensured while the internal space utilization rate of the shell is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer and a battery pack. Background Art

[0002] In the field of battery production, single JR (bare cell) batteries reduce the amount of anode materials due to the simple winding process. Specifically, single JR reduces the amount of materials used in the first and last turns of anode and separator compared to double JR and multi-JR designs under the same capacity design. In addition, the assembly process of single JR batteries is simple. In the ultrasonic welding process, compared with multi-JR designs, single JR can reduce the frequency of ultrasonic welding and welding of connecting plates, thereby effectively increasing production. On the other hand, the volume energy density of single JR batteries is also relatively high.

[0003] Although the single JR battery has the above advantages, it still has disadvantages compared to the double JR battery. For example, more space needs to be reserved inside the shell for the bending and setting of the tabs. Although this does not affect the subsequent utilization of the space in the battery pack, it will lead to a decrease in the utilization rate of the space inside the shell. If the height of the shell is increased to compensate for the increased space for the tabs, although the utilization rate of the space inside the shell can be guaranteed, it will affect the subsequent utilization rate of the space in the battery pack. For this reason, it is urgent to improve the battery cells so as not to reduce the utilization rate of the space inside the shell while also not reducing the utilization rate of the space inside the battery pack. Utility Model Content

[0004] To this end, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a battery cell and a battery pack, in which the top cover of the battery cell is redesigned and the top cover of the battery cell is tilted so as to ensure the utilization of the internal space of the shell while ensuring the utilization of the internal space of the entire battery pack.

[0005] In order to solve the above technical problems, the present invention provides a battery cell, comprising:

[0006] A housing having an accommodating cavity, wherein the housing comprises a cover plate and a first side plate and a third side plate arranged opposite to each other along a second direction;

[0007] A battery cell is accommodated in the accommodating cavity; the battery cell includes a battery cell body and a tab, the battery cell body has a first end face disposed toward the cover plate, the first end face and the first direction are perpendicular to each other, and the first direction and the second direction are perpendicular to each other; the tab includes a lead-out portion and a bent portion, the lead-out portion is led out from the first end face of the battery cell body, and the bent portion is connected to the lead-out portion;

[0008] In which, the cover plate has a first end arranged away from the bending portion and a second end arranged away from the first end along the second direction, the first side plate is connected to the first end of the cover plate, the third side plate is connected to the second end of the cover plate, and the distance between the first end and the first end surface is smaller than the distance between the second end and the first end surface.

[0009] In one embodiment of the present invention, the shell has an opening, and the shell has a first side panel, a second side panel, a third side panel and a fourth side panel that surround the opening, and the cover plate seals the opening, wherein the first side panel is connected to the first end, the third side panel is connected to the second end, and the angle between the first side panel and the cover plate is α, 90°<α≤135°.

[0010] In one embodiment of the present invention, the first side panel has a first inner side wall arranged toward the third side panel and a first inclined surface connected to the first inner side wall; the third side panel has a second inner side wall arranged toward the first side panel and a second inclined surface connected to the second inner side wall; the angle between the first inclined surface and the first inner side wall and the angle between the second inclined surface and the second inner side wall are both β; the cover plate includes a first surface arranged toward the accommodating cavity and a third inclined surface and a fourth inclined surface connected to the first surface; the third inclined surface of the cover plate contacts and cooperates with the first inclined surface, and the fourth inclined surface of the cover plate contacts and cooperates with the second inclined surface; the angle between the first surface and the third inclined surface and the angle between the first surface and the fourth inclined surface are both γ, wherein β:γ=1:1.

[0011] In one embodiment of the present invention, an insulating member is further included, and the pole ear also includes a connecting portion connected to the bending portion. The insulating member is located between the battery cell body and the cover plate. The insulating member includes a substrate and a flip plate. The substrate and the cover plate are stacked. The end of the flip plate close to the first end is flipably connected to the substrate, and the end of the flip plate away from the first end is arranged between the connecting portion and the lead-out portion.

[0012] In one embodiment of the present invention, the cover plate is provided with a first pole assembly and a second pole assembly, the first pole assembly and the second pole assembly are arranged at intervals along a third direction, the first pole assembly includes a first pole extending along the first direction, the second pole assembly includes a second pole extending along the first direction, and the first pole and the second pole are electrically connected to the two pole ears respectively.

[0013] In one embodiment of the present invention, the first pole has a first connecting surface arranged away from the accommodating cavity along the first direction, and the first connecting surface is provided with a slot. The second pole has an inserting portion arranged away from the accommodating cavity along the first direction, and the inserting portion of the second pole is configured to be plugged into and matched with the slot on the first pole in another battery cell.

[0014] In one embodiment of the present invention, the first pole has a mounting portion disposed away from the accommodating cavity along the first direction, the mounting portion passes through the cover plate and protrudes from the cover plate, and the mounting portion has the first connecting surface disposed away from the cover plate along the first direction.

[0015] In one embodiment of the present invention, the plug-in portion is provided with a first through hole for the connector to pass through, and the mounting portion is provided with a second through hole passing through the slot and for the connector to pass through, and the first through hole is configured to be arranged opposite to the second through hole in another battery cell.

[0016] The present invention also provides a battery pack, comprising at least one battery group, wherein the battery group comprises two battery cell groups arranged opposite to each other along a first direction, each battery cell group comprises at least one battery cell as described above, the cover plates of the two adjacent battery cells are opposite to each other and arranged with inclined surfaces in the first direction, and the two adjacent battery cells are staggered in a third direction and electrically connected.

[0017] The present utility model also provides a battery pack, comprising at least one battery group, wherein the battery group comprises two battery cell groups arranged relative to each other along a first direction, each battery cell group comprises the battery cells described above, wherein, in the first direction, the cover plates of the two adjacent battery cells are arranged relative to each other and the oblique surfaces are matched along the first direction, and the two adjacent battery cells are staggered in a third direction, and in the two adjacent battery cells, the plug-in portion on the second pole in one battery cell and the slot on the first pole in the other battery cell are plugged in and connected by a connecting member passing through the first through hole and the second through hole.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] The utility model describes a battery cell, whose cover plate has a first end arranged away from the bending portion and a second end arranged away from the first end along the second direction, the first side plate is connected to the first end of the cover plate, the third side plate is connected to the second end of the cover plate, and the distance between the first end and the first end face is smaller than the distance between the second end and the first end face. In this way, the cover plate is designed to be inclined without affecting the bending of the tab, so as to ensure the utilization of the internal space of the shell while ensuring the utilization of the internal space of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein.

[0021] Figure 1 It is a schematic diagram of the overall structure of the battery cell of the present utility model.

[0022] Figure 2 It is a partial structural diagram of the shell of the utility model.

[0023] Figure 3 It is a partial structural diagram of the shell and cover of the utility model.

[0024] Figure 4 yes Figure 2 A partial enlarged view of .

[0025] Figure 5 It is a partial structural diagram of the cover plate, pole assembly, pole ear and insulating member of the utility model.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the first pole of the first battery cell of the present invention.

[0027] Figure 7 This is a schematic diagram of the cross-sectional structure of the second pole of the first battery cell of the present invention.

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the first pole of the second battery cell of the present invention.

[0029] Figure 9 This is a schematic diagram of the cross-sectional structure of the second pole of the second battery cell of the present invention.

[0030] Figure 10 It is a partial structural diagram of the first pole of the second battery cell of the present invention.

[0031] Figure 11 It is a partial structural diagram of the second pole of the second battery cell of the present invention.

[0032] Figure 12 This is a schematic diagram of the connection between the first pole and the second pole when assembling a battery pack composed of the second type of battery cells of the present invention.

[0033] Figure 13 This is a schematic diagram of the first assembly method of the battery pack of the present invention.

[0034] Figure 14 This is a schematic diagram of the second assembly method of the battery pack of the present invention.

[0035] Explanation of the reference numerals in the specification: 10. Shell; 100. Bottom plate; 101. First side plate; 1010. First inner wall; 1011. First inclined surface; 102. Second side plate; 103. Third side plate; 1030. Second inner wall; 1031. Second inclined surface; 104. Fourth side plate; 20. Cover plate; 30. Battery cell; 31. Battery cell body; 32. Tab; 320. Lead-out portion; 321. Bending portion; 322. Connecting portion; 140. Base plate; 141. Flip plate; 142. Flip connector; 15. Adapter; 201. First pole; 2010. Second through-hole; 2011. First connecting surface; 202. Second pole; 2020. First through-hole; 40. Connecting member; 50. Side plate. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention. Example 1

[0037] Reference Figure 1 and Figure 2 As shown, the present invention discloses a battery cell, including a shell 10, the shell 10 includes a first side plate 101 and a third side plate 103 arranged opposite to each other along the second direction, and a second side plate 102 and a fourth side plate 104 arranged opposite to each other along the third direction, the first side plate 101, the second side plate 102, the third side plate 103 and the fourth side plate 104 are connected end to end in sequence to form a shell structure, the openings at both ends of the shell structure along the first direction are sealed by the cover plate 20 and the bottom plate 100 respectively, wherein the first side plate 101, the second side plate 102, the third side plate 103, the fourth side plate 104, the cover plate 20 and the bottom plate 100 form an accommodating cavity, the first direction is defined as the same direction as the length direction of the battery cell 30, the second direction is defined as the same direction as the thickness direction of the battery cell 30, and the third direction is defined as the same direction as the width direction of the battery cell 30.

[0038] It should be noted that the shell structure is an integrally formed structure, and the shell structure and the bottom plate 100 are integrally formed to form an outer shell, and the cover plate 20 and the outer shell are connected by laser welding.

[0039] Continue Figure 1The battery cell further includes a cell 30, which is accommodated in the accommodating cavity. Specifically, the cell 30 includes a cell body 31 and a tab 32. The cell body 31 has a first end surface facing the cover plate 20, and the first end surface and the first direction are perpendicular to each other. The tab 32 extends from the first end surface of the cell body 31. The tab 32 includes a lead-out portion 320 and a bent portion 321. The lead-out portion 320 extends from the first end surface of the cell body 31, and the bent portion 321 is connected to the lead-out portion 320.

[0040] In which, the cover plate 20 has a first end arranged away from the bending portion 321 and a second end arranged away from the first end along the second direction, the first side plate 101 is connected to the first end of the cover plate 20, the third side plate 103 is connected to the second end of the cover plate 20, and the distance between the first end and the first end surface is smaller than the distance between the second end and the first end surface.

[0041] It can be seen from this that in this embodiment, since the distance between the first end and the first end face is smaller than the distance between the second end and the first end face, that is, the distance from the connection between the first side plate 101 and the first end to the first end face is smaller than the distance from the connection between the third side plate 103 and the second end to the first end face, therefore, inside the shell, the cover plate 20 is tilted while leaving an accommodating space for the bent portion 321 of the tab 32, and outside the shell, the cover plate 20 is tilted, so that two adjacent battery cells arranged in the battery pack can reduce the space they occupy in the first direction by means of inclined surface matching, thereby ensuring the utilization of the internal space of the shell while ensuring the utilization of the internal space of the entire battery pack.

[0042] Further, combined with Figure 1 as well as Figure 2 From the perspective of FIG. 1 , the included angle between the first side plate 101 and the cover plate 20 is α, 90°<α≤135°.

[0043] Specifically, the angle α between the first side plate 101 and the cover plate 20 can be 95°, 100°, 105°, 110°, 115°, 120°, 125° or 130°, wherein when the angle between the first side plate 101 and the cover plate 20 is between 90° and 135°, there is enough space in the shell for the tab 32 to bend.

[0044] As a preferred embodiment, in order to facilitate the welding of the cover plate 20 and the shell, Figure 3 as well as Figure 4As shown, the first side panel 101 has a first inner side wall 1010 set toward the third side panel 103 and a first inclined surface 1011 connected to the first inner side wall 1010, the third side panel 103 has a second inner side wall 1030 set toward the first side panel 101 and a second inclined surface 1031 connected to the second inner side wall 1030, the angle between the first inclined surface 1011 and the first inner side wall 1010, and the angle between the second inclined surface 1031 and the second inner side wall 1030 are both β; the cover plate 20 includes a first surface set toward the accommodating cavity and a third inclined surface and a fourth inclined surface connected to the first surface, the third inclined surface of the cover plate 20 is in contact with the first inclined surface 1011; the fourth inclined surface and the second inclined surface 1031 of the cover plate 20 are in contact with each other.

[0045] Specifically, the angle between the first surface and the third inclined surface, and the angle between the first surface and the fourth inclined surface, are both γ, where β:γ = 1:1. This arrangement can achieve a better welding effect, making the contact surface between the cover plate 20 and the housing 10 more flat, thereby achieving a better welding effect, and further improving the airtightness of the battery cell accommodating cavity, achieving a better sealing effect.

[0046] It should be noted that in a single JR design battery cell, the tab itself is usually designed to be long. When the tab is folded, it is easy for the tab to be inserted into the battery cell body, thus posing a short circuit risk. In order to avoid the tab being inserted in reverse and to improve the insulation performance of the battery cell, refer to Figure 5 As shown, the battery cell also includes an insulating part, the tab 32 also includes a connecting portion 322 connected to the bending portion 321, the insulating part is located between the battery cell body 31 and the cover plate 20, the insulating part includes a substrate 140 and a flip plate 141, the substrate 140 and the cover plate 20 are stacked, the end of the flip plate 141 close to the first end is flipably connected to the substrate 140, and the end of the flip plate 141 away from the first end is arranged between the connecting portion 322 and the lead-out portion 320.

[0047] As a preferred embodiment, according to Figure 5 As shown, the insulating member further includes a flip connector 142, through which the base plate 140 and the flip plate 141 are flipped and connected. Specifically, one end of the flip connector 142 is connected to the base plate 140, and the other end of the flip connector 142 is connected to the flip plate 141, with a fold formed between the flip connector 142 and the flip plate 141. As a result, after being folded, a support space is formed between the flip plate 141 and the base plate 140. The flip connector 142 and the flip plate 141 can form an "L-shaped" enveloping support space, so that the connecting portion 322 can be accommodated in the support space, thereby effectively preventing the tab 32 from being inserted upside down and avoiding the risk of short circuit.

[0048] As a preferred embodiment, the base plate 140, the flip plate 141 and the flip connector 142 can be an integrally formed design. Of course, in other embodiments, the base plate 140, the flip plate 141 and the flip connector 142 can also be a split design.

[0049] As a preferred embodiment, the cover plate 20 is provided with a first pole assembly and a second pole assembly, and the first pole assembly and the second pole assembly are spaced apart along a third direction, which is perpendicular to the first direction.

[0050] From the details, combined Figure 6 as well as Figure 7 From the perspective of the embodiment, the first pole assembly includes a first pole 201 extending along the first direction, and the second pole assembly includes a second pole 202 extending along the first direction. The first pole 201 and the second pole 202 are electrically connected to the two pole ears 32 respectively. While ensuring the electrical connection between the pole and the pole ear 32, since the cover plate 20 is arranged at an angle, the height of the pole can be reduced, the amount of pole used can be reduced, and the purpose of cost reduction can be achieved.

[0051] Looking further, according to Figure 6 As shown in Figure 7, the first pole 201 has a first connecting surface 2011 arranged away from the accommodating cavity along the first direction, and the first connecting surface 2011 is provided with a slot. The second pole 202 has an inserting portion arranged away from the accommodating cavity along the first direction, and the inserting portion of the second pole 202 is configured to be plugged into and matched with the slot on the first pole in another battery cell.

[0052] As a preferred embodiment, the size of the plug-in part matches that of the slot, so that the plug-in part and the slot can be clamped to each other to achieve a tight connection and maximize the contact surface, thereby ensuring the stability of the electrical connection between adjacent battery cells and making the battery pack more conductive.

[0053] It should be noted that the first pole 201 may or may not protrude from the cover plate 20 , wherein when the first pole 201 does not protrude from the cover plate 20 , the plug-in portion of one battery cell can be embedded in the cover plate 20 of another battery cell.

[0054] Further, refer to Figure 6 As shown, the first pole 201 has a mounting portion arranged away from the accommodating cavity along the first direction, the mounting portion is passed through the cover plate 20 and protrudes from the cover plate 20, and the mounting portion has a first connecting surface 2011 arranged away from the cover plate 20 along the first direction. Therefore, the first pole 201 is designed to protrude from the cover plate 20, thereby providing the possibility of locking the first pole 201 of a subsequent battery cell and the second pole 202 of another battery cell through the connecting member 40.

[0055] As a preferred embodiment, the battery cell further includes a switching piece 15 , which is used to connect the electrode tab 32 with the first electrode assembly and the second electrode assembly. Example 2

[0056] according to Figure 6 、 Figure 8 、 Figure 9 、 Figure 11 as well as Figure 12 As shown, different from the first embodiment, the plug-in portion is provided with a first through hole 2020 for the connector 40 to pass through, and the mounting portion is provided with a through slot and a second through hole 2010 for the connector 40 to pass through, and the first through hole 2020 is configured to be arranged opposite to the second through hole in another battery cell.

[0057] Therefore, when the first pole 201 of two battery cells is nested and connected with the second pole 202 of another battery cell, the first pole 201 and the second pole 202 can be more tightly connected through the connector 40. The connector 40 can penetrate and be inserted into the first through hole 2020 and the second through hole of the other battery cell to play a fastening role.

[0058] As a preferred embodiment, the connecting member 40 is a conductive connecting rod. Example 3

[0059] The utility model also discloses a battery pack, combined with Figure 13 As shown, the battery pack includes at least one battery group, and the battery group includes two battery cell groups arranged opposite to each other along a first direction, and each battery cell group includes at least one battery cell as in the first embodiment.

[0060] Specifically, the cover plates 20 of two adjacent battery cells are arranged opposite each other in a first direction and with their bevels aligned. The two adjacent battery cells are staggered and electrically connected in a third direction. This arrangement reduces the space occupied by the two battery cells in the first direction, thereby compensating for the increased height of the battery cells due to the space provided by the bent tabs.

[0061] In addition, the battery pack is further provided with two limiting plates 50 arranged opposite to each other along the first direction, and at least one battery pack is arranged between the two limiting plates 50 to realize the assembly of the battery cells in the battery pack. Example 4

[0062] The utility model also discloses a battery pack, combined with Figure 14 As shown, the battery pack includes at least one battery group, and the battery group includes two battery cell groups arranged opposite to each other along a first direction, and each battery cell group includes the battery cells described in the second embodiment.

[0063] In the first direction, the cover plates of two adjacent battery cells are opposite to each other and arranged with their oblique surfaces in cooperation with each other, and the two adjacent battery cells are staggered in the third direction. Specifically, in the two adjacent battery cells, the plug-in portion on the second pole 202 of one battery cell is plugged into the slot on the first pole 201 of the other battery cell, and the connector 40 passes through the first through-hole 2020 and the second through-hole 2010 to achieve a tight plug-in connection between the second pole 202 of one battery cell and the first pole 201 of the other battery cell.

[0064] In addition, the battery pack is further provided with two limiting plates 50 arranged opposite to each other along the first direction, and at least one battery pack is arranged between the two limiting plates 50 to realize the assembly of the battery cells in the battery pack. Example 5

[0065] The present utility model also discloses an electrical device, which uses the battery pack described in the fourth embodiment.

[0066] From this, it can be seen that the electrical equipment can obtain relatively stable and long-lasting power supply, and since the stability of the battery pack is improved, the safety performance of the battery pack is also effectively improved, and thus the safety performance of the electrical equipment is also improved.

[0067] Electrical equipment can be cars, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Cars can be fuel cars, gas cars, or new energy cars. New energy cars can be pure electric cars, hybrid cars, or extended-range cars, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0068] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0069] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0070] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0071] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: include, A housing (10) having an accommodating cavity, the housing (10) having a cover plate (20) and a first side plate (101) and a third side plate (103) arranged opposite to each other along a second direction; A battery cell (30) is accommodated in the accommodating cavity; the battery cell (30) comprises a battery cell body (31) and a tab (32); the battery cell body (31) has a first end face arranged toward the cover plate (20); the first end face and a first direction are perpendicular to each other, and the first direction and the second direction are perpendicular to each other; the tab (32) comprises a lead-out portion (320) and a bent portion (321); the lead-out portion (320) is led out from the first end face of the battery cell body (31); the bent portion (321) is connected to the lead-out portion (320); The cover plate (20) has a first end disposed away from the bending portion (321) and a second end disposed away from the first end along the second direction, the first side plate (101) is connected to the first end of the cover plate (20), the third side plate (103) is connected to the second end of the cover plate (20), and the distance between the first end and the first end surface is smaller than the distance between the second end and the first end surface.

2. A battery cell according to claim 1, characterized in that: The included angle between the first side plate (101) and the cover plate (20) is α, 90°<α≤135°.

3. A battery cell according to claim 2, characterized in that: The first side panel (101) has a first inner side wall (1010) disposed toward the third side panel (103) and a first inclined surface (1011) connected to the first inner side wall (1010); the third side panel (103) has a second inner side wall (1030) disposed toward the first side panel (101) and a second inclined surface (1031) connected to the second inner side wall (1030); the angle between the first inclined surface (1011) and the first inner side wall (1010) and the angle between the second inclined surface (1031) and the first inner side wall (1010) are The included angles between the first surface and the third inner side wall (1030) are both β; the cover plate (20) comprises a first surface arranged toward the accommodating cavity and a third inclined surface and a fourth inclined surface connected to the first surface, the third inclined surface of the cover plate (20) and the first inclined surface (1011) are in contact with each other, and the fourth inclined surface of the cover plate (20) and the second inclined surface (1031) are in contact with each other, and the included angles between the first surface and the third inclined surface and the included angles between the first surface and the fourth inclined surface are both γ, wherein β:γ=1:

1.

4. A battery cell according to any one of claims 1 to 3, characterized in that: The battery cell (31) further comprises an insulating member, wherein the tab (32) further comprises a connecting portion (322) connected to the bending portion (321), and the insulating member is located between the battery cell body (31) and the cover plate (20). The insulating member comprises a substrate (140) and a flip plate (141), wherein the substrate (140) and the cover plate (20) are stacked, wherein an end of the flip plate (141) close to the first end is flipably connected to the substrate (140), and an end of the flip plate (141) away from the first end is arranged between the connecting portion (322) and the lead-out portion (320).

5. A battery cell according to claim 4, characterized in that: The cover plate (20) is provided with a first pole assembly and a second pole assembly, the first pole assembly and the second pole assembly are spaced apart along a third direction, the first pole assembly includes a first pole (201) extending along the first direction, the second pole assembly includes a second pole (202) extending along the first direction, and the first pole (201) and the second pole (202) are respectively electrically connected to the two pole lugs (32).

6. The battery cell according to claim 5, characterized in that: The first pole (201) has a first connection surface (2011) disposed away from the accommodating cavity along a first direction, the first connection surface (2011) being provided with a slot, and the second pole (202) has a plug-in portion disposed away from the accommodating cavity along the first direction, the plug-in portion of the second pole (202) being configured to be plugged into and matched with the slot on the first pole in another battery cell.

7. The battery cell according to claim 6, characterized in that: The first pole (201) has a mounting portion arranged away from the accommodating cavity along a first direction, the mounting portion is arranged through the cover plate (20) and protrudes from the cover plate (20), and the mounting portion has the first connecting surface (2011) arranged away from the cover plate (20) along the first direction.

8. The battery cell according to claim 7, characterized in that: The plug-in portion is provided with a first through hole (2020) for the connecting member (40) to pass through, and the mounting portion is provided with a second through hole (2010) that passes through the slot and for the connecting member (40) to pass through, and the first through hole (2020) is configured to be arranged opposite to the second through hole in another battery cell.

9. A battery pack, characterized in that: The invention comprises at least one battery pack, wherein the battery pack comprises two battery cell groups arranged opposite to each other along a first direction, each battery cell group comprises at least one battery cell according to any one of claims 1 to 7, the cover plates (20) of the two adjacent battery cells are arranged opposite to each other along the first direction and the cover plates (20) are arranged with inclined surfaces, and the two adjacent battery cells are staggered in a third direction and are electrically connected.

10. A battery pack, characterized in that: The invention comprises at least one battery pack, wherein the battery pack comprises two battery cell groups arranged relative to each other along a first direction, each battery cell group comprises the battery cell described in right 8, wherein, in the first direction, the cover plates of the two adjacent battery cells are relative to each other and are arranged with inclined surfaces in cooperation along the first direction, and the two adjacent battery cells are staggered in the second direction, and in the two adjacent battery cells, the plug-in portion on the second pole in one battery cell and the slot on the first pole in the other battery cell are plugged into each other and are connected by a connecting member passing through the first through hole and the second through hole.

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