Battery monomer and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery monomer and electric equipment. The battery monomer comprises a battery shell, a battery cell assembly and a coating film, the battery shell is provided with an end wall perpendicular to a first direction, and the first direction is the length direction of the battery shell; the battery cell assembly is positioned in the battery shell; the covering film comprises a covering part and a traction part, and the covering part covers the battery cell assembly; in the first direction, the side, close to the end wall, of the covering part is connected with a traction part. And at least part of the traction part is limited between the battery core assembly and the end wall. According to the battery monomer, the difficulty that the battery cell assembly enters the battery shell can be reduced, the production efficiency of the battery monomer is improved, and the use safety of the battery monomer is higher.

Description

Technical Field

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

[0002] The current blade battery is made longer due to the volume energy density requirement. The four sides of the shell used by the blade battery are closed, leaving only two opposite sides as the entrance for the battery cell to enter the shell, which means that the battery cell can only enter the shell from the entrance opened on one small side. When the battery cell enters the shell, it needs to move from one end side to the other end side, that is, it needs to move a distance in the length direction of the shell. Since the gap between the battery cell itself and the shell is very small, the operation of inserting the battery cell into the shell is more difficult, which reduces the production efficiency of the blade battery.

[0003] Therefore, there is an urgent need to provide a battery cell and an electrical device to solve the above-mentioned technical problems in the prior art. Utility Model Content

[0004] The utility model aims to provide a battery cell, which can reduce the difficulty of inserting a battery core into a shell, improve the production efficiency of the battery cell, and make the battery cell safer to use.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The battery cell comprises a battery shell, a battery cell assembly and a covering film, wherein the battery shell has an end wall perpendicular to a first direction, and the first direction is the length direction of the battery shell; the battery cell assembly is located in the battery shell; the covering film comprises a covering portion and a traction portion, and the covering portion covers the battery cell assembly; in the first direction, the traction portion is connected to a side of the covering portion close to the end wall; at least a portion of the traction portion is limited between the battery cell assembly and the end wall.

[0007] Optionally, a bending line is provided at a connection between the traction portion and the covering portion.

[0008] Optionally, two of the traction parts are provided, and the two traction parts are arranged opposite to each other along a second direction, and the second direction is a width direction of the battery housing.

[0009] Optionally, the battery shell includes an outer shell and an end cover, a first opening is formed at one end of the outer shell in the first direction, the other end of the outer shell in the first direction is connected to the end cover, the end cover is provided with a second opening, and the size of the second opening is smaller than the size of the first opening; wherein a side wall of the end cover facing the interior of the outer shell is the end wall.

[0010] Optionally, the battery cell assembly includes a battery cell and a bracket, the battery cell is covered by the covering portion; the bracket is located between the battery cell and the end wall, and at least a portion of the bracket is covered by the covering portion; at least a portion of the traction portion is limited between the bracket and the end wall, and the traction portion is in contact with the end wall.

[0011] Optionally, the traction portion includes a bending portion and a connecting portion, and one end of the bending portion away from the covering portion is connected to the connecting portion; a notch is provided at a position of the bracket corresponding to the bending portion; the bending portion is accommodated in the notch, and the bending portion is limited in the notch by a limiting portion; the connecting portion is limited between the bracket and the end wall, and the connecting portion is in contact with the end wall, and / or the connecting portion is connected to the bracket.

[0012] Optionally, the bracket has a first surface arranged away from the battery cell in the first direction; the bracket has a peripheral side wall connected to the first surface; the concave groove is formed between the peripheral side wall and the first surface; the groove includes a first groove bottom wall intersecting with the peripheral side wall, and the first groove bottom wall is inclined.

[0013] Optionally, the above-mentioned groove also includes two first groove side walls arranged opposite to each other, and the two first groove side walls are connected by the above-mentioned first groove bottom wall; at least one of the two first groove side walls is provided with a limiting portion protruding toward the inside of the above-mentioned groove; the above-mentioned bending portion is limited between the above-mentioned limiting portion and the above-mentioned first groove bottom wall at its edge portion in the width direction.

[0014] Optionally, the bracket has a first surface arranged away from the battery cell and a second surface arranged away from the first surface, the first surface of the bracket is provided with a groove sunken in the direction from the first surface to the second surface, and the second surface of the bracket is provided with a protrusion protruding in the direction from the first surface to the second surface corresponding to the groove; a hole penetrating the protrusion is provided in the groove; at least a part of the orthographic projection of the traction part on the projection plane is located within the orthographic projection of the notch of the groove on the projection plane, and the projection plane and the first direction are perpendicular to each other.

[0015] Another object of the present invention is to provide an electrical device, the electrical device comprising a battery cell as described in any of the above schemes. The battery cell used in the electrical device is safer to use and has improved reliability.

[0016] Beneficial effects:

[0017] The battery cell uses a battery shell to contain the battery cell assembly. The battery shell has an end wall perpendicular to the first direction. The covering portion of the coating film is coated on the outside of the battery cell assembly. A traction portion is provided at one end of the covering portion close to the end wall. At least part of the traction portion is limited between the battery cell assembly and the end wall. The traction portion is provided to make it easier to load the battery cell assembly into the battery shell. Specifically, in the process of loading the battery cell into the shell, the traction device can pull the battery cell assembly into the battery shell by clamping the traction portion. After the traction is completed, it is only necessary to bend the traction portion and limit it between the battery cell assembly and the above-mentioned end wall. The battery cell can reduce the difficulty of loading the battery cell assembly into the battery shell, improve the production efficiency of the battery cell, and the battery cell is safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric diagram of a battery cell assembly provided in a specific embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 It is a longitudinal cross-sectional schematic diagram of a battery core assembly provided in a specific embodiment of the utility model;

[0021] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle;

[0023] Figure 6 yes Figure 3 A partial enlarged view of point D in the middle;

[0024] Figure 7 It is an axonometric view of the bracket provided by the specific embodiment of the utility model;

[0025] Figure 8 yes Figure 7 A partial enlarged view of point E in the middle;

[0026] Fig. 9 It is an axonometric diagram of another perspective of the bracket provided by the specific embodiment of the utility model;

[0027] Fig.10 yes Fig. 9 A partial enlarged view of point F in the middle;

[0028] Fig.11 It is a top view of the unfolded covering film provided by the specific embodiment of the utility model.

[0029] In the figure:

[0030] 100, battery cell; 200, bracket; 201, first surface; 202, peripheral side wall; 203, second surface; 210, notch; 211, first groove bottom wall; 212, first groove side wall; 220, limit portion; 230, groove; 240, raised portion; 250, hole; 300, coating; 310, traction portion; 311, bending portion; 312, connecting portion; 320, covering portion; 400, battery case; 410, end cover; 411, end wall; 500, rear cover assembly. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The first direction described in this specific implementation manner is Figure 1 The X direction shown in is the length direction of the battery cell; the second direction is Figure 1 The Y direction shown in is the width direction of the battery cell; the third direction is Figure 1 The Z direction shown in is the thickness direction of the battery cell; the first direction, the second direction and the third direction are perpendicular to each other.

[0036] Please refer to Figures 1 to 4 In this specific embodiment, the battery cell includes a battery shell 400, a battery cell assembly and a coating film 300, the battery shell 400 has an end wall 411 perpendicular to a first direction, and the first direction is the length direction of the battery shell 400; the battery cell assembly is located in the battery shell 400; the coating film 300 includes a covering portion 320 and a traction portion 310, and the covering portion 320 covers the battery cell assembly; in the first direction, the traction portion 310 is connected to a side of the covering portion 320 close to the end wall 411; at least a portion of the traction portion 310 is limited between the battery cell assembly and the end wall 411.

[0037] In this embodiment, the traction part 310 and the covering part 320 are designed to be connected, and the covering part 320 covers the battery cell assembly, which makes it more convenient to install the battery cell assembly into the battery shell 400. Specifically, in the process of inserting the battery cell into the shell, the traction device can pull the battery cell assembly into the battery shell 400 by clamping the traction part 310; on the other hand, the pulling force is transmitted to the covering part 320 through the traction part 310, and then transmitted to the battery cell assembly through the covering part 320, so that the integrity of the battery cell assembly can be ensured during the process of the battery cell assembly entering the battery shell 400, and the qualified rate of inserting into the shell is high. In addition, at least part of the traction part 310 is designed to be limited between the battery cell assembly and the end wall 411, so there is no need to design a cutting process for the traction part 310, and the traction part 310 can be fixed by using the end wall 411 and the battery cell assembly, which is quick to operate.

[0038] It should be noted that the traction portion 310 and the covering portion 320 can be an integrally formed structure, that is, the covering film 300 having the traction portion 310 and the covering portion 320 can be obtained by cutting a whole film; of course, the traction portion 310 and the covering portion 320 can also be a split structure, that is, the traction portion 310 can be connected to the covering portion 320 by bonding, clamping, hot melting, etc., and the specific connection method is not limited, as long as the traction portion 310 and the covering portion 320 are firmly connected.

[0039] For details about this embodiment, please refer to Fig.11The covering film 300 is made of a whole film sheet, and the covering portion 320 is provided with four folds, which divide the covering portion 320 into a first small surface covering area, a first large surface covering area, a second small surface covering area, a second large surface covering area and a third small surface covering area which are connected in sequence. The first large surface covering area and the second large surface covering area of ​​the covering portion 320 respectively cover two large surfaces in the thickness direction of the battery cell 100, the second small surface covering area of ​​the covering portion 320 covers a small surface in the width direction of the battery cell 100, the first small surface covering area and the third small surface covering area of ​​the covering portion 320 at least partially overlap and cover another small surface in the width direction of the battery cell 100; and the second small surface covering area and the first small surface covering area are both connected to the traction portion 310.

[0040] In some embodiments, Figure 2 As shown, there is a bending line at the connection between the traction part 310 and the covering part 320. After the battery cell assembly is put into the shell, the traction part 310 can be bent along the bending line, so that the traction part 310 is limited between the battery cell assembly and the end wall 411, ensuring that the traction part 310 is flatly arranged between the battery cell assembly and the end wall 411, and ensuring the production efficiency of the battery monomer.

[0041] In some embodiments, the number, location and size of the traction parts 310 are not limited. The traction parts 310 may be provided with one, two, three or four, and the multiple traction parts 310 are arranged at intervals around the battery cell assembly. Specifically in this embodiment, there are two traction parts 310, and the two traction parts 310 are arranged opposite to each other along the second direction, and the second direction is the width direction of the battery shell 400. The two traction parts 310 are symmetrically arranged, so that in the process of pulling the battery cell assembly into the shell, the two ends of the battery cell assembly along the second direction are subjected to the same force, which ensures the smooth movement of the battery cell assembly into the shell, and can also play a guiding role to prevent the battery cell assembly from hitting the inside of the battery shell 400, thereby improving production efficiency and ensuring that the battery cell assembly is not damaged, thereby improving the production quality of battery monomers obtained by mass production.

[0042] In some embodiments, Figure 3 As shown, the battery shell 400 includes an outer shell and an end cover 410, a first opening is formed at one end of the outer shell in the first direction, the other end of the outer shell in the first direction is connected to the end cover 410, the end cover 410 is provided with a second opening, the size of the second opening is smaller than the size of the first opening, specifically, the orthographic projection of the second opening on the projection plane is located within the orthographic projection of the first opening on the projection plane, and the projection plane and the first direction are perpendicular to each other; wherein, a side wall of the end cover 410 facing the interior of the outer shell is the end wall 411.

[0043] The outer shell and the end cover 410 can be integrally formed. When the outer shell and the end cover 410 are integrally formed, the traction equipment needs to first enter the battery shell 400 through the second opening, and then drive the battery cell assembly into the battery shell by clamping the traction part 310. It should be noted here that since the assembly of the small cover plate and the end cover 410 is completed after the battery cell assembly is fully entered into the shell, it is necessary to control the traction equipment to release the traction part 310 and leave the battery shell 400 when the battery cell assembly has not fully entered the battery shell 400, and then it is necessary to push the battery cell assembly on the side away from the end cover 410 to fully enter the battery shell 400. Here, when the battery cell assembly fully enters the battery shell 400, the traction part 310 is also limited between the battery cell assembly and the above-mentioned end wall 411.

[0044] Of course, the outer shell and the end cover 410 can also be arranged separately, that is, an opening is formed at one end of the outer shell away from the first opening, and the end cover 410 is adapted to the opening; when the outer shell and the end cover 410 are arranged separately, the traction device needs to first enter the battery shell 400 through the opening on the outer shell, and then drive the battery cell assembly into the battery shell by clamping the traction part 310. It should be noted here that since the end cover 410 is not yet provided at the opening of the outer shell, the traction device can release the traction part 310 after the battery cell assembly is completely in the battery shell 400, or release the traction part 310 and leave the battery shell 400 before fully entering the battery shell. After the battery cell assembly completely enters the battery shell 400, the end cover 410 closes the opening of the outer shell, and the traction part 310 is also limited between the battery cell assembly and the above-mentioned end wall 411.

[0045] In this embodiment, no matter the battery housing 400 is an integrated structure or a split structure, the insertion of the battery cell assembly into the housing and the fixing of the traction part 310 are both simple and convenient to operate, thereby improving the production efficiency of the battery cells.

[0046] In some embodiments, Figures 3 to 6 As shown, the battery cell assembly includes a battery cell 100 and a bracket 200, the battery cell 100 is covered by the covering portion 320; the bracket 200 is located between the battery cell 100 and the end wall 411, and at least a portion of the bracket 200 is covered by the covering portion 320; at least a portion of the traction portion 310 is limited between the bracket 200 and the end wall 411.

[0047] Specifically in this embodiment, the battery cell assembly includes a battery cell 100, a small cover plate assembly and a rear cover plate assembly 500, the small cover plate assembly and the rear cover plate assembly 500 are arranged relative to each other along a first direction, the small cover plate assembly includes a bracket 200 and a small cover plate matching the second opening, a pole is arranged on the small cover plate, and the bracket 200 is located between the small cover plate and the battery cell 100 to ensure that the small cover plate and the battery cell 100 are insulated, wherein the bracket 200 is fixed on the small cover plate; the rear cover plate assembly 500 includes a bracket 200 and a large cover plate matching the first opening, a pole is arranged on the large cover plate, and the bracket 200 is located between the large cover plate and the battery cell 100 to ensure that the large cover plate and the battery cell 100 are insulated, wherein the bracket 200 is fixed on the large cover plate.

[0048] Of course, the battery cell assembly can also be composed of only the battery cell 100 and two brackets 200 respectively located on both sides of the battery cell 100 in the first direction. The types of specific components of the battery cell assembly are not limited, as long as it includes the battery cell 100 and the two brackets 200.

[0049] It should be noted that the structures of the two brackets 200 in the battery cell assembly may be the same or different, depending on the actual structure of the battery cell to be designed.

[0050] In some embodiments, in order to allow the pulling device to capture the position of the pulling portion 310 more quickly and to allow the battery cell assembly to enter the battery housing 400 more easily, please refer to Figures 7 and 8 The traction portion 310 includes a bending portion 311 and a connecting portion 312, and one end of the bending portion 311 away from the covering portion 320 is connected to the connecting portion 312; the bracket 200 is provided with a notch 210 at a position corresponding to the bending portion; the bending portion is accommodated in the notch 210, and the bending portion 311 is limited in the notch 210 by the limiting portion 220; the connecting portion 312 is limited between the bracket 200 and the end wall 411, and the connecting portion 312 is in contact with the end wall 411, and / or the connecting portion 312 is connected to the bracket 200.

[0051] In this embodiment, since the bending portion 311 is accommodated in the notch 210 and is limited in the notch 210 by the limiting portion 220, when the battery cell assembly has not completely entered the battery housing 400, the limiting bending portion 311 is used to limit the inclination angle of the bending of the traction portion 310, that is, the traction portion 310 and the plane perpendicular to the first direction maintain a certain inclination angle, so that the traction device can capture the traction portion 310 faster and more accurately because it is not affected by the covering portion 320; in addition, since the traction portion 310 is pre-bent and tilted, it can more easily enter the first opening of the battery housing 400, and can play a guiding role when the battery cell assembly enters the first opening of the battery housing 400.

[0052] In addition, in this embodiment, the connection portion 312 can be fixed only by contact with the end wall 411, or can be fixed to the bracket 200 by bonding, hot melting or clamping.

[0053] It should be noted that the number and location of the notches 210 are determined by the traction portion 310. For example, two traction portions 310 and two notches 210 are provided, the two traction portions 310 are arranged opposite to each other along the second direction, and notches 210 are provided at both ends of the bracket 200 along the second direction.

[0054] Furthermore, the specific structure of the notch 210 is not limited, as long as it can accommodate the bent portion 311. Specifically in this embodiment, the specific structure of the notch 210 is as follows: Figure 8 As shown, the bracket 200 has a first surface 201 disposed away from the battery cell 100 in the first direction; the bracket 200 has a peripheral side wall 202 connected to the first surface 201; a concave notch 210 is formed between the peripheral side wall 202 and the first surface 201; the notch 210 includes a first groove bottom wall 211 intersecting with the peripheral side wall 202, and the first groove bottom wall 211 is inclined. By designing the first groove bottom wall 211 to be inclined, the traction part 310 is limited, ensuring that the traction part 310 will not be further bent, thereby limiting the inclined position of the traction part 310.

[0055] Furthermore, in this specific embodiment, Figure 4 and Figure 5 One end of the bending portion 311 away from the connecting portion 312 is connected to the covering portion 320 , and the first groove bottom wall 211 intersects with the first surface 201 .

[0056] Specifically, the peripheral side wall 202 is covered by the covering portion 320. After the traction portion 310 is led out from the covering portion 320, it is first bent and attached to the above-mentioned first groove bottom wall 211, and then bent again during the shell insertion process. The bent portion is the connecting portion 312, and the connecting portion 312 is parallel to the first surface 201 and contacts the end wall 411 of the end cover 410.

[0057] Further, in this specific embodiment, if Fig. 9 and Fig.10 As shown, the above-mentioned defective groove 210 also includes two first groove side walls 212 arranged opposite to each other along the width direction of the bending portion 311, and the two above-mentioned first groove side walls 212 are connected by the above-mentioned first groove bottom wall 211; at least one of the two above-mentioned first groove side walls 212 is provided with a limiting portion 220 protruding toward the inside of the above-mentioned defective groove 210; the above-mentioned bending portion 311 is limited between the limiting portion 220 and the first groove bottom wall 211 at its edge portion in the width direction.

[0058] In this specific embodiment, the two first groove bottom walls 211 of the notch 210 are both integrally formed with a limiting portion 220, and an accommodating space for accommodating the edge portion of the bending portion 311 in the width direction is formed between each limiting portion 220 and the first groove bottom wall 211. When the traction battery cell assembly is put into the shell, the traction portion 310 is first bent, and then the edge portion of the bending portion 311 in the width direction is accommodated in the accommodating space, and the bending state of the traction portion 310 is limited by the limiting portion 220 and the first groove bottom wall 211, so as to limit the position of the traction portion 310, so as to facilitate the traction equipment to clamp the traction portion 310, thereby improving the efficiency of traction of the battery cell assembly into the shell; wherein, since the traction portion 310 is made of a diaphragm, under the action of external force, the edge portion of the traction portion 310 in the width direction can easily enter between the limiting portion 220 and the first groove bottom wall 211.

[0059] In some embodiments, Figure 4 , Figure 5 as well as Figures 7 to 9 As shown, the bracket 200 has a first surface 201 arranged away from the battery cell 100 and a second surface 203 arranged away from the first surface 201, the first surface 201 of the bracket 200 is provided with a groove 230 recessed along the direction from the first surface 201 to the second surface 203, and the second surface 203 of the bracket 200 is provided with a protrusion 240 protruding along the direction from the first surface 201 to the second surface 203 corresponding to the groove 230; a hole 250 penetrating the protrusion 240 is provided in the groove 230; at least a part of the orthographic projection of the traction portion 310 on the projection plane is located within the orthographic projection of the notch of the groove 230 on the projection plane, and the projection plane and the first direction are perpendicular to each other.

[0060] In this embodiment, the protrusion 240 is arranged in the length direction of the battery cell to limit the battery cell assembly, thereby preventing the battery cell 100 from moving up and down inside the battery casing 400; a groove 230 and a hole 250 are arranged so that the electrolyte entering the groove 230 enters the battery casing from the hole 250; wherein, since at least part of the orthographic projection of the traction portion 310 on the projection plane is located within the orthographic projection of the notch of the above-mentioned groove 230 on the projection plane, the traction portion 310 can isolate foreign matter in the groove 230 from the end wall 201, thereby making the insulation more reliable and the battery safer.

[0061] Further, it should be noted that there are two grooves 230, two protrusions 240 and two grooves 210, and the two grooves 230, two protrusions 240 and the groove 210 are all arranged opposite to each other along the second direction; wherein, the groove 210 is located on one side of the groove 230 in the second direction, and the first groove bottom wall 211 of the groove 210 intersects with the side wall of the groove 230, and in order to avoid the traction part 310 occupying the internal space of the battery housing 400, the connecting part 312 of the traction part 310 can be designed to be accommodated in the groove 230.

[0062] This specific embodiment also provides an electrical device, which includes a battery cell as described in any of the above solutions. The battery cell used in the electrical device has a higher efficiency of cell shell insertion, which can improve production efficiency, and has higher safety and reliability.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery housing (400), the battery housing (400) having an end wall (411) perpendicular to a first direction, the first direction being a length direction of the battery housing (400); A battery cell assembly, the battery cell assembly being located in the battery casing (400); A covering film (300), the covering film (300) comprising a covering portion (320) and a pulling portion (310), the covering portion (320) covering the battery cell assembly; in a first direction, a side of the covering portion (320) close to the end wall (411) is connected to the pulling portion (310); at least a portion of the pulling portion (310) is limited between the battery cell assembly and the end wall (411).

2. The battery cell according to claim 1, characterized in that: A bending line is provided at the connection between the traction portion (310) and the covering portion (320).

3. The battery cell according to claim 1, characterized in that: Two traction parts (310) are provided, and the two traction parts (310) are arranged opposite to each other along a second direction, and the second direction is the width direction of the battery housing (400).

4. The battery cell according to claim 1, characterized in that: The battery housing (400) comprises an outer shell and an end cover (410), wherein a first opening is formed at one end of the outer shell in a first direction, and the end cover (410) is connected to the other end of the outer shell in the first direction, and the end cover (410) is provided with a second opening, wherein the size of the second opening is smaller than the size of the first opening; wherein a side wall of the end cover (410) facing the interior of the outer shell is the end wall (411).

5. The battery cell according to any one of claims 1 to 4, characterized in that: The battery core assembly comprises: A battery core (100), wherein the battery core (100) is covered by the covering portion (320); A bracket (200), the bracket (200) being located between the battery core (100) and the end wall (411), at least a portion of the bracket (200) being covered by the covering portion (320); and at least a portion of the traction portion (310) being limited between the bracket (200) and the end wall (411).

6. The battery cell according to claim 5, characterized in that: The traction portion (310) comprises a bending portion (311) and a connecting portion (312), and one end of the bending portion (311) away from the covering portion (320) is connected to the connecting portion (312); the bracket (200) is provided with a notch (210) at a position corresponding to the bending portion (311); the bending portion (311) is accommodated in the notch (210), and the bending portion (311) is limited in the notch (210) by a limiting portion (220); the connecting portion (312) is limited between the bracket (200) and the end wall (411), and the connecting portion (312) is in contact with the end wall (411), and / or the connecting portion (312) is connected to the bracket (200).

7. The battery cell according to claim 6, characterized in that: The support (200) has a first surface (201) arranged away from the battery cell (100) in a first direction; the support (200) has a peripheral side wall (202) connected to the first surface (201); an inwardly concave notch (210) is formed between the peripheral side wall (202) and the first surface (201); the notch (210) includes a first groove bottom wall (211) intersecting with the peripheral side wall (202), and the first groove bottom wall (211) is arranged obliquely.

8. The battery cell according to claim 7, characterized in that: The defective groove (210) comprises two first groove side walls (212) arranged opposite to each other along the width direction of the bending portion (311), and the two first groove side walls (212) are connected via the first groove bottom wall (211); at least one of the two first groove side walls (212) is provided with the limiting portion (220) protruding toward the inside of the defective groove (210); the bending portion (311) is limited between the limiting portion (220) and the first groove bottom wall (211) at an edge portion in the width direction thereof.

9. The battery cell according to claim 5, characterized in that: The support (200) has a first surface (201) arranged away from the battery cell (100) and a second surface (203) arranged away from the first surface (201) in a first direction; the first surface (201) of the support (200) is provided with a groove (230) recessed along the direction from the first surface (201) to the second surface (203); the second surface (203) of the support (200) is provided with a protruding portion (240) protruding along the direction from the first surface (201) to the second surface (203) corresponding to the groove (230); a hole (250) penetrating the protruding portion (240) is provided in the groove (230); at least part of the orthographic projection of the traction portion (310) on the projection plane is located within the orthographic projection of the notch of the groove (230) on the projection plane, and the projection plane and the first direction are perpendicular to each other.

10. Electrical equipment, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

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