Battery cell, battery device, and vehicle
By setting a mating connection structure between the housing and the end cap, the problem of the end cap's positional deviation during the welding process is solved, achieving stable packaging and good fit of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-03-24
AI Technical Summary
In existing technologies, it is difficult to maintain an accurate welding position for the end caps of battery cells during the welding process, leading to welding errors and poor encapsulation results.
A first mating part is provided at the opening of the housing, and a second mating part is provided at the edge of the end cap. The connection between the first mating part and the second mating part realizes the fixed positioning of the end cap on the housing, preventing the end cap from deviating from the predetermined welding position relative to the housing.
This improves the reliability of the battery cell packaging process, ensures a good fit between the end cap and the housing and the packaging effect, and prevents welding errors.
Smart Images
Figure CN224036488U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of battery, in particular to a battery monomer, a battery device and a vehicle. BACKGROUND
[0002] In the related art, the battery monomer is usually packaged by a shell and an end cover arranged on the shell, and the end cover is generally fixed to the shell by welding to complete the packaging. However, in the process of welding the end cover and the shell, it is difficult to keep the end cover at the accurate welding position, and the end cover may move relative to the shell, resulting in welding failure, and the packaged end cover and shell do not cooperate well. CONTENT OF THE UTILITY MODEL
[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery monomer, a battery device and a vehicle, wherein the end cover of the battery monomer can be accurately kept at the welding position, and the end cover and the shell cooperate well.
[0004] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell and an end cover, the shell having a cavity with at least one open side, and the shell being provided with a first fitting part at the open port; the end cover is arranged on the open port of the shell, and the end cover is provided with a second fitting part; wherein when the end cover is arranged on the shell, the first fitting part is connected with the second fitting part to realize the fixed limiting of the end cover on the shell.
[0005] According to the battery monomer of the embodiments of the present application, the first fitting part is arranged at the open port of the shell, and the second fitting part is arranged at the edge of the end cover, the fixed limiting of the end cover on the shell is realized by the connection of the first fitting part and the second fitting part, and then the end cover is prevented from deviating from its predetermined welding position relative to the shell, so as to prevent welding failure caused by the misplacement of the end cover, effectively improve the reliability of the packaging process of the battery monomer, and make the packaged end cover and shell cooperate well.
[0006] According to further embodiments of the present application, the end of the shell forming the open port is provided with a step part, the step part has a first face and a second face, the end cover is lapped on the first face, the second face is opposite to the side face of the end cover, and the first fitting part is formed on the second face, and the second fitting part is formed on the side face of the end cover.
[0007] In some embodiments, the number of first fitting parts is multiple, and the first fitting parts are arranged at intervals on the second face, the number of second fitting parts can be multiple, and the second fitting parts are arranged at intervals on the circumferential side of the end cover, and the first fitting parts and the second fitting parts correspond one by one.
[0008] In some embodiments, the first mating part is a limiting groove formed on the edge of the opening, and the second mating part is a limiting protrusion formed on the edge of the end cap.
[0009] Furthermore, the limiting groove includes a first groove and a second groove, the second groove is connected to the first groove, and the second groove is located on the side closer to the open opening relative to the first groove, and the depth of the second groove is less than that of the first groove.
[0010] Furthermore, the second groove is an arc-shaped groove, the first groove is a square groove, and the second groove extends from the edge of the open opening to the first groove.
[0011] Furthermore, the limiting protrusion has a cuboid structure.
[0012] According to a further embodiment of this application, the edge of the end cap facing the first surface is chamfered, and the chamfered second mating part faces the housing.
[0013] Secondly, this application proposes a battery device including the battery cell described in the above embodiments.
[0014] Thirdly, this application proposes a vehicle including the aforementioned battery device suitable for gift-giving.
[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0017] Figure 1 These are schematic diagrams of the shell structure according to some embodiments of this application;
[0018] Figure 2 This is a schematic diagram of the end cap structure according to some embodiments of this application;
[0019] Figure 3 It is based on Figure 1 The center circle shows a magnified view of a portion of area A;
[0020] Figure 4 It is based on Figure 2 The center circle shows a magnified view of a portion of area B.
[0021] Figure 5 This is a cross-sectional view of the end cap and housing after encapsulation according to some embodiments of this application;
[0022] Figure 6 It is based on Figure 5 The middle circle shows a magnified view of area C.
[0023] Reference signs:
[0024] 100 - battery cell
[0025] 110 - shell, 111 - open port, 112 - stepped portion, 1121 - first surface, 1122 - second surface, 113 - limiting groove, 1131 - first groove, 1132 - second groove
[0026] a - cavity
[0027] 120 - end cover, 121 - chamfer, 122 - limiting protrusion, 123 - positive electrode tab, 124 - negative electrode tab, 125 - liquid injection port, 126 - explosion-proof valve DETAILED DESCRIPTION
[0028] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by like or similar reference signs throughout the drawings. The embodiments described below are examples for explaining the present application, and are not intended to limit the present application.
[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0030] In the description of the present application, "first feature" and "second feature" can include one or more of the features.
[0031] In the description of the present application, "a plurality of" means two or more.
[0032] In the description of the present application, "above" or "below" the first feature with respect to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature therebetween.
[0033] In the description of the present application, "above", "over", and "on" the first feature with respect to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature.
[0034] Reference is made below Figures 1-6 to describe the battery cell 100, the battery device and the vehicle according to the embodiments of the present application.
[0035] The battery cell 100 according to the embodiments of the present application comprises a shell 110 and an end cover 120, the shell 110 defines a cavity a inside, one side of the cavity a of the shell 110 is open, and the end cover 120 is arranged at the opening 111 of the shell 110.
[0036] Specifically, the cavity a defined by the shell 110 and the end cover 120 is suitable for arranging the electrode assembly (one or more bare cells, which can be a wound cell or a stacked cell) in the shell 110, so as to encapsulate the electrode assembly to form a complete battery cell 100 after the end cover 120 is fixed to the shell 110.
[0037] When producing the battery cell 100, the opening 111 arranged at one side of the cavity a of the shell 110 can place the electrode assembly into the cavity a through the opening 111. For example, one bare cell is arranged in the cavity a, and the bare cell is encapsulated by the shell 110 and the end cover 120 to form one battery cell 100.
[0038] Reference is made below Figure 1 It is understood that the shell 110 is configured as a cuboid structure as shown in Figure 1 , and is configured as an aluminum shell, the inside of which defines a cuboid cavity a, and similarly, the cuboid cavity a is suitable for arranging multiple electrode assemblies, such as multiple stacked bare cells, side by side. Correspondingly, the end cover 120 is a rectangular plate as shown in Figure 2 , and the edge of the end cover 120 matches the edge of the opening 111.
[0039] It is worth noting that the shell 110 and the end cover 120 can be encapsulated by welding, and during the welding process, the end cover 120 needs to be accurately placed on the opening 111 of the shell 110 to ensure that the end cover 120 is in the accurate welding position relative to the shell 110. The welding mentioned in the embodiments of the present application can be any welding method that can weld the shell 110 and the end cover 120, such as arc welding, gas welding, etc., so as to complete the encapsulation of the battery cell 100. Of course, the foregoing is not intended to limit the embodiments of the present application to welding to form the encapsulation of the end cover 120 and the shell 110, and other similar encapsulation methods should also be within the protection scope of the present application.
[0040] Next, the case of realizing the packaging by welding is described. Due to manufacturing errors and other reasons, the size of the area where the end cover and the shell are welded together is small, and the stability of the end cover before being welded to the shell is poor. Therefore, if the height of the roll core is greater than or equal to the height of the edge of the open end 111 of the shell 110, the end cover 120 is pushed open by the roll core after the end cover 120 is fitted to the shell 110, and if external touching occurs during welding and other reasons, interference occurs, causing the end cover 120 to deviate, and other situations. This can cause the end cover 120 to not be able to be stably maintained in its welding area or welding position relative to the shell 110 during welding, and thus poor welding can occur, and the end cover 120 can not be fitted to the correct welding position relative to the shell 110, resulting in welding failure.
[0041] In addition, during welding, the end cover 120 can also move under the action of welding thermal stress, such as: the end cover 120 and the shell 110 can generate a certain thermal stress during welding, causing the end cover 120 to expand.
[0042] In order to avoid the above-mentioned welding failure, the shell 110 is provided with a first fitting part at the open end 111, and the end cover 120 is provided with a second fitting part, wherein when the end cover 120 is fitted to the shell 110, the first fitting part and the second fitting part are connected to realize the fixed limiting of the end cover 120 on the shell 110.
[0043] In other words, the end cover 120 and the shell 110 are connected by the first fitting part and the second fitting part to form a limit, for example, the first fitting part of the shell 110 and the second fitting part on the end cover 120 can be connected by mechanical engagement, insertion, or by magnetic attraction between the magnet metal and the magnet to form a fixed fit, or other forms of connection.
[0044] Therefore, after the end cover 120 and the shell 110 are fitted, the first fitting part and the second fitting part are connected, and the end cover 120 is fixed relative to the shell 110 through the connection of the two, so that the end cover 120 does not move relative to the shell 110 and thus completes the fixed limiting, which can keep the end cover 120 always in the correct welding position relative to the shell 110. And the connection of the first fitting part and the second fitting part after fitting is performed before welding, so that during welding, even if the end cover 120 or the shell 110 is disturbed by the outside or due to the height problem of the internal battery monomer 100 (such as the roll core), the end cover 120 can be kept in the expected welding position relative to the shell 110, and welding failure caused by the end cover 120 moving incorrectly can be avoided, and thus a good packaging effect of the end cover 120 and the shell 110 is achieved.
[0045] Further, in some examples, the connecting structure between the shell 110 and the end plate of the battery monomer 100 can include a first fitting part, a second fitting part, and a plurality of welding points formed between the shell 110 and the end plate, and an electrode assembly such as a bare cell electrolyte is arranged inside.
[0046] According to the battery monomer 100 of the embodiments of the present application, the first fitting part is arranged at the open port 111 of the shell 110, and the second fitting part is arranged at the edge of the end cover 120, and the fixation and limiting of the end cover 120 on the shell 110 are realized through the connection of the first fitting part and the second fitting part, so as to prevent the end cover 120 from deviating from the predetermined welding position relative to the shell 110, thereby preventing welding failure caused by the accidental movement of the end cover 120, effectively improving the reliability of the packaging process of the battery monomer 100, and making the fitting effect and packaging effect of the packaged end cover 120 and the shell 110 good.
[0047] In some embodiments, as shown in Figure 1 and Figure 3 , one end of the shell 110 forming the open port 111 is provided with a step part 112, the step part 112 has a first surface 1121 and a second surface 1122, and the end cover 120 is lapped on the first surface 1121, and the second surface 1122 is opposite to the side surface of the end cover 120.
[0048] Specifically, the step part 112 arranged at the open port 111 of the shell 110 provides a positioning reference for the end cover 120, that is, when the end cover 120 is assembled to the shell 110 along the direction perpendicular to the opening, the end cover 120 is lapped to the first surface 1121 of the step part 112 along the direction of the thickness of the plane (i.e. the bottom surface of the end cover 120) facing the opening, so as to limit the end cover 120 from continuing to move into the cavity a, and at the same time, the second surface 1122 of the step part 112 is opposite to the side surface of the end cover 120, so as to limit the movement of the end cover 120 in the horizontal direction of itself, thereby realizing the preliminary positioning of the cooperation between the end cover 120 and the shell 110 through the cooperation of the first surface 1121 and the second surface 1122 in two directions.
[0049] It can be understood that through the cooperation of the end cover 120 and the step part 112, the preliminary positioning of the end cover 120 on the shell 110 is realized, so as to facilitate the smooth and rapid cooperation of the first fitting part and the second fitting part. On the other hand, this preliminary positioning can also provide a positioning reference for the subsequent welding process, which is helpful to prevent the movement or deviation of the end cover 120 relative to the shell 110 during the welding process, thereby effectively improving the accuracy and reliability of the packaging of the battery monomer 100.
[0050] Further, referring to Figures 3-4The first matching part is formed on the second face 1122, and the side face of the end cover 120 is formed with a second matching part, and the first matching part and the second matching part are in position correspondence, so as to form a fixed limit after the end cover 120 is matched to the open port 111 of the shell 110. The first matching part and the second matching part form a limit along the direction perpendicular to the open port 111.
[0051] In some assembly cases, the end cover 120 can be accurately placed on the open port 111 of the shell 110, and the edge of the end cover 120 is overlapped to the stepped part 112 at the open port 111 of the shell 110, so that the side face of the end cover 120 faces the first face 1121, and the side face of the end cover 120 is attached or substantially attached to the second face 1122, so that the end cover 120 gradually approaches the first face 1121 under the guidance of the second face 1122, and finally overlaps the first face 1121. During the movement of the end cover 120 towards the first face 1121, the first matching part and the second matching part begin to contact each other, so that after the end cover 120 is overlapped to the first face 1121, the first matching part and the second matching part form a matching.
[0052] Further, after the first matching part and the second matching part are completely matched, the end cover 120 is fixed at the open port 111 of the shell 110. At this time, even if disturbed by the outside world or due to the problem that the height of the internal battery monomer 100 part does not meet the requirements, the end cover 120 can be kept in the expected assembly position under the limiting action of the first matching part and the second matching part. In this way, during the subsequent welding process, the stable connection between the end cover 120 and the shell 110 can be ensured, thereby effectively improving the accuracy and reliability of the battery monomer 100 packaging.
[0053] In some examples, as shown in Figure 4 and Figure 6 The edge of the end cover 120 towards the first face 1121 is configured with a chamfer 121, and the chamfer 121 is located on the side of the second matching part towards the shell 110. In other words, the chamfer 121 is closer to the shell 110 relative to the second matching part.
[0054] Therefore, during the process of assembling the end cover 120 to the shell 110, the chamfer 121 can first explore or first contact the shell 110, and the chamfer 121 can serve as a guide structure to guide the end cover 120 into the stepped part 112 of the open port 111 by contacting the edge of the shell 110 through its inclined surface.
[0055] It can be understood that the chamfer 121 can guide the end cover 120 to enter the open mouth 111 of the shell 110 more easily and smoothly transition to the lapping of the first face 1121 of the stepped portion 112, so that the end cover 120 is more smooth when assembled to the shell 110, and the resistance and friction in the assembly process are reduced.
[0056] Next, referring to Figures 3-6 , the specific structure of the first and second matching parts of the embodiments of the present application is exemplarily described. Among them, the first matching part is the limiting groove 113 formed at the edge of the open mouth 111, and the second matching part is the limiting protrusion 122 formed at the edge of the end cover 120.
[0057] Referring to Figure 3 and Figure 5 , here the assembly direction of the end cover 120 towards the shell 110 is defined as the first direction, the direction perpendicular to the circumferential wall of the shell 110 and towards the cavity a is defined as the second direction, and the limiting groove 113 is a stepped groove formed at the edge of the open mouth 111 of the shell 110, wherein the limiting groove 113 extends in the first direction and has a high-low in the second direction, and the part of the limiting groove 113 near the open mouth 111 is slightly higher than the rest of the groove body in the second direction.
[0058] Correspondingly, the limiting protrusion 122 can first enter the part of the stepped groove near the open mouth 111 and slightly higher in the second direction, and then as the end cover 120 continues to be assembled, the limiting protrusion 122 will move along the shape of the stepped groove towards the first face 1121, and finally be clamped into the part of the groove slightly lower in the second direction.
[0059] That is, the end cover 120 is lapped to the first face 1121, the limiting protrusion 122 moves along the stepped structure of the limiting groove 113 body, and finally cooperates with the limiting groove 113, when cooperating, the limiting protrusion 122 is completely clamped into the part of the stepped groove lower in the second direction, so that the end cover 120 cannot move in the first direction.
[0060] It can be understood with reference to the example shown in Figure 3 , the limiting groove 113 includes a first groove 1131 and a second groove 1132, the second groove 1132 communicates with the first groove 1131, and the second groove 1132 is arranged on the side close to the open mouth 111 relative to the first groove 1131, and the depth of the second groove 1132 is less than that of the first groove 1131, wherein since the depth of the second groove 1132 is less than that of the first groove 1131, a stepped groove extending in the first direction and having a high-low in the second direction is formed.
[0061] Specifically, in the process of the circumferential side wall surface of the end cover 120 abutting against the second surface 1122 and then entering the open mouth 111, the limiting protrusion 122 configured on the circumferential side wall surface of the end cover 120 will first contact the second groove 1132, move along the second groove 1132 under the guidance of the second groove 1132, and then, after the limiting protrusion 122 reaches the first groove 1131, the limiting protrusion 122 is completely clamped into the first groove 1131. After clamping, the limiting protrusion 122 cooperates with the first groove 1131 to form a limit of the end cover 120 relative to the shell 110 in the first direction, that is, the end cover 120 and the shell 110 are connected and fixed by the first cooperating part and the second cooperating part.
[0062] It can be understood that the second groove 1132 is formed at the edge of the open mouth 111 and is slightly higher than the first groove 1131 in the second direction, so that the second groove 1132 can to some extent avoid the movement of the limiting protrusion 122 in the first direction towards the first groove 1131, so that the limiting protrusion 122 can smoothly pass through the second groove 1132 and be clamped into the first groove 1131 during assembly, without difficulty or damage.
[0063] In more detail, the second groove 1132 is an arc-shaped groove, the first groove 1131 is a square groove, the second groove 1132 extends from the edge of the open mouth 111 to the first groove 1131, and the limiting protrusion 122 is a cuboid structure. During assembly of the end cover 120 and the shell 110, the limiting protrusion 122 will move along the arc-shaped groove of the second groove 1132 to slide into the first groove 1131. Because the arc-shaped groove has a smooth curve, the smooth transition reduces resistance and friction during assembly, which makes it easier for the limiting protrusion 122 to enter the groove and ensures that the limiting protrusion 122 can stably contact the limiting groove 113 during sliding.
[0064] After the limiting protrusion 122 moves to the first groove 1131, the cuboid structure of the limiting protrusion 122 cooperates with the square groove of the first groove 1131, as shown in Figure 6 , so that the cuboid structure forms a limit in each direction by cooperating with the first groove 1131 to form a fixed limiting effect of the first cooperating part and the second cooperating part after cooperation.
[0065] Of course, the limiting protrusion 122 and the limiting groove 113 can also have other structures, such as the limiting groove 113 being a groove formed of a magnetic material, and the limiting protrusion 122 being a protrusion embedded on the circumferential side wall surface of the end cover 120 and having a magnetic material that is attracted to the magnetic material in the limiting groove 113. For example, the limiting groove 113 is an elastic clamping groove, and the limiting protrusion 122 is an elastic buckle at the edge of the end cover 120, and the shape of the buckle matches the clamping groove.
[0066] According to any one of the preceding embodiments, the number of first matching parts can be multiple, and the first matching parts are arranged at intervals on the second surface 1122. The number of second matching parts can be multiple, and the second matching parts are arranged at intervals on the circumferential side of the end cover 120. The first matching part and the second matching part correspond to each other. For example, the shell 110 is a cuboid structure, and each open port 111 has four second surfaces 1122. Each second surface 1122 is provided with a corresponding first matching part. Correspondingly, the end cover 120 is a rectangular plate body, and the four side surfaces of the end cover 120 are respectively provided with a second matching part. Each first matching part corresponds to a second matching part.
[0067] It can be understood that by arranging multiple matching parts, the stress generated by the misalignment tendency between the end cover 120 and the shell 110 due to external interference can be uniformly dispersed to more contact points, so as to reduce the stress intensity of a single contact point. Therefore, by cooperating the multiple first matching parts and the second matching parts, the movement of the end cover 120 relative to the shell 110 can be better limited, thereby improving the stability of the end cover 120 relative to the shell 110 after the first matching part and the second matching part are matched.
[0068] In some examples, the assembled battery cell 100 can be understood with reference to Figure 2 and Figures 5-6 .
[0069] In an example, the end cover 120 includes a positive electrode tab 123 and a negative electrode tab 124 arranged along the thickness direction thereof, which are respectively used as the positive and negative connection points of the battery for leading out and leading in current. The positive electrode tab 123 is an external connection part of the positive electrode in the battery cell 100. The negative electrode tab 124 corresponds to the positive electrode tab 123, and the negative electrode tab 124 is an external connection part of the negative electrode in the battery cell 100.
[0070] Further, the positive electrode tab 123 and the negative electrode tab 124 are both inserted into the cavity a to form an electrical connection with the internal bare cell, and the edge of the end cover 120 is adapted to cooperate with the edge of the open port 111, thereby encapsulating the bare cell inside and outputting current through the positive electrode tab 123 and the negative electrode tab 124.
[0071] Specifically, the two tabs on the end cover 120 connect the bare cell inside the cavity a with the external circuit to realize current exchange. When the battery needs to be discharged, the positive tab 123 leads the current generated by the positive electrode inside the bare cell out, for the use of the external circuit. During the charging process, the positive electrode of the external power supply inputs the current to the positive electrode of the bare cell through the positive tab 123. Correspondingly, during the discharging process, the negative tab 124 leads the current of the negative electrode of the bare cell out, together with the positive current to form a current loop. During the charging process, the negative electrode of the external power supply inputs the current to the negative electrode of the bare cell through the negative tab 124.
[0072] In some other examples, the cavity a can also store electrolyte to form a wet battery monomer 100. Specifically, the end cover 120 further comprises a liquid injection port 125 arranged between the two tabs, wherein the liquid injection port 125 is used to inject electrolyte into the cavity a defined by the shell 110 and the end cover 120. After injecting an appropriate amount of electrolyte through the liquid injection port 125, the liquid injection port 125 is usually sealed to prevent leakage of the electrolyte.
[0073] In addition, according to any one of the preceding examples, continuing to refer to Figure 2 and Figure 5 It is shown that the end cover 120 further comprises an explosion-proof valve 126 arranged between the two tabs, and the explosion-proof valve 126 is adapted to automatically open when the internal pressure of the battery monomer 100 abnormally rises (such as internal short circuit or thermal runaway caused by overcharge, short circuit, etc.), so as to release the internal excessive pressure, thereby preventing the battery monomer 100 from exploding.
[0074] The battery device according to the embodiments of the present application comprises the battery monomer 100 described in any one of the preceding embodiments.
[0075] The vehicle according to the embodiments of the present application is provided with the battery device described in any one of the preceding embodiments.
[0076] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0077] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims
1. A battery cell, characterized in that, include: The housing (110) has a cavity (a) open on at least one side, and the housing (110) has a first mating part constructed at the opening (111); End cap (120), the end cap (120) is provided on the opening (111) of the housing (110), and the end cap (120) is provided with a second mating part; in When the end cap (120) is placed on the housing (110), the first mating part is connected to the second mating part to achieve the fixed positioning of the end cap (120) on the housing (110).
2. The battery cell according to claim 1, characterized in that, The housing (110) has a stepped portion (112) at one end forming the opening (111). The stepped portion (112) has a first surface (1121) and a second surface (1122). The end cap (120) overlaps the first surface (1121). The second surface (1122) is opposite to the side surface of the end cap (120). The first mating portion is formed on the second surface (1122), and the second mating portion is formed on the side surface of the end cap (120).
3. The battery cell according to claim 2, characterized in that, The number of the first mating parts is multiple and they are spaced apart on the second surface (1122). The number of the second mating parts is also multiple and they are spaced apart on the periphery of the end cap (120). The first mating parts and the second mating parts correspond one-to-one.
4. The battery cell according to claim 2, characterized in that, The first mating part is a limiting groove (113) formed on the edge of the opening (111), and the second mating part is a limiting protrusion (122) formed on the edge of the end cap (120).
5. The battery cell according to claim 4, characterized in that, The limiting groove (113) includes a first groove (1131) and a second groove (1132). The second groove (1132) communicates with the first groove (1131), and the second groove (1132) is located on the side of the first groove (1131) closer to the opening (111). The depth of the second groove (1132) is less than that of the first groove (1131).
6. The battery cell according to claim 5, characterized in that, The second groove (1132) is an arc-shaped groove, the first groove (1131) is a square groove, and the second groove (1132) extends from the edge of the opening (111) to the first groove (1131).
7. The battery cell according to claim 6, characterized in that, The limiting protrusion (122) has a cuboid structure.
8. The battery cell according to claim 2, characterized in that, The end cap (120) has a chamfer (121) on the edge facing the first surface (1121), and the second mating part of the chamfer (121) faces the housing (110).
9. A battery device, characterized in that, include: The battery cell according to any one of claims 1-8.
10. A vehicle, characterized in that, The battery device as described in claim 9 is provided.