Battery cell and battery pack

Abstract

A battery cell and a battery pack. An accommodating cavity (101) is provided in a casing (100), and the accommodating cavity (101) is provided with an opening. A top cover assembly (200a) comprises a top cover (200) and terminal posts (210) passing through the top cover (200), wherein the top cover (200) covers the opening. Cores (300) are disposed in the accommodating cavity (101), each core (300) comprising a body (300a) and a tab (310) connected to the body (300a), wherein the tab (310) is arranged on the side of the body (300a) that is close to the top cover (200). A connector (400) is disposed between each tab (310) and the top cover (200). The top cover (200) is provided with a recessed cavity (201) at a position corresponding to each tab (310); one end of each connector (400) is connected to a terminal post (210), and the other end of each connector (400) is provided with a bent portion (401); and each bent portion (401) is located in a recessed cavity (201) and connected to the tab (310). Thus, the structural space of the top cover (200) can be effectively utilized, such that the height space in the battery cell which is occupied by the connection between each connector (400) and the tab (310) can be reduced, and the risk of the connector (400) pressing the tab (310) and causing inverted insertion of the tab (310) into the core (300) can also be effectively reduced, improving the safety performance of the battery cell.

Description

Battery cell and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 24, 2024, with application number "202420178838.9" and application name "A Battery Cell and Battery Pack", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery technology, and specifically relates to a battery cell and a battery pack. Background Art

[0003] With the rapid rise of new energy battery vehicles, they have become an important means of transportation. As a core component of new energy vehicles, power batteries play a vital role in these vehicles. Typically, power batteries consist of several cells, which are connected in series using a busbar, which connects the cells to external devices.

[0004] In the prior art, a battery cell consists of a housing and a top cover. The top cover seals the upper opening of the housing, and the core is housed within the housing. The top cover is provided with a terminal post, and a tab extends from the core. The tab is connected to the terminal post via a connector. However, due to the limited space between the core and the top cover, the connector can squeeze the tab at its connection, easily causing the tab to be inserted upside down into the battery cell.

[0005] Application Contents

[0006] The present application aims to provide a battery cell and a battery pack that can solve the problem in the battery cells of related technologies that, due to the space limitation between the pole core and the top cover, the connector will squeeze the pole ear at the connection with the pole ear, which may easily cause the pole ear to be inserted upside down into the pole core.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell, a top cover assembly, a pole core, and a connector;

[0009] The housing is provided with a housing cavity, the housing cavity having an opening, the top cover assembly comprising a top cover and a pole penetrating the top cover, the top cover sealing the opening, the pole core being provided in the housing cavity, the pole core comprising a body and a pole ear connected to the body, the pole ear being provided on a side of the body close to the top cover, and the connecting member being provided between the pole ear and the top cover;

[0010] The top cover is provided with a concave cavity at a position corresponding to the tab, one end of the connector is connected to the pole, and the other end of the connector is provided with a bent portion, which is located in the concave cavity and connected to the tab.

[0011] Optionally, the top cover includes a first surface and a second surface that are oppositely arranged, the first surface faces the pole core, the second surface is a plane, and the cavity is recessed and extends from the first surface toward the second surface.

[0012] Optionally, a protrusion is provided on the second surface at a position corresponding to the cavity, and the cavity extends from the first surface recessed into the protrusion.

[0013] Optionally, the pole core has a height direction, and along the height direction of the pole core, the height of the protrusion is H1; the pole is at least partially exposed on the second surface, and the height of the exposed portion of the pole is H2, satisfying: H1≤H2.

[0014] Optionally, the protrusion is spaced apart from the pole, and a first gap exists between the protrusion and the pole.

[0015] Optionally, the pole core has a height direction and a length direction perpendicular to the height direction. Along the length direction of the pole core, the minimum size of the first gap is D mm, satisfying: 0.5≤D≤100.

[0016] Optionally, the raised portion and the top cover are integrally formed.

[0017] Optionally, the cavity has a bottom wall, and a second gap exists between the bent portion and the bottom wall.

[0018] Optionally, the pole core has a height direction, and along the height direction of the pole core, the minimum size of the second gap is H3mm, satisfying: H3≥0.5.

[0019] In a second aspect, an embodiment of the present application proposes a battery pack comprising the battery cell described in any one of the above items.

[0020] In an embodiment of the present application, a concave cavity is provided in the top cover at a position corresponding to the tab in the pole core, a connector is provided between the pole core and the top cover, and one end of the connector is bent to form a bent portion, so that the bent portion is located in the concave cavity of the top cover and connected to the tab. In this way, the structural space of the top cover can be effectively utilized to reduce the internal height space of the battery cell occupied by the connection between the connector and the tab, thereby helping to improve the internal space utilization rate of the battery cell. At the same time, by enabling the connector to be connected to the tab in the concave cavity of the top cover, the extrusion of the tab at the connection between the connector and the tab can be reduced while ensuring the internal space utilization rate of the battery cell, thereby reducing the risk of the tab being significantly deformed and inserted into the pole core, thereby improving the safety performance of the battery cell.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] FIG1 is a perspective view of a battery cell according to an embodiment of the present application;

[0026] FIG2 is a top view of a battery cell according to an embodiment of the present application;

[0027] FIG3 is a cross-sectional view of a battery cell according to an embodiment of the present application;

[0028] FIG4 is an enlarged view of a battery cell according to an embodiment of the present application, corresponding to the circled portion A in FIG3 ;

[0029] FIG5 is an enlarged view of another battery cell according to an embodiment of the present application, corresponding to the circled portion A in FIG3 ;

[0030] FIG6 is a schematic diagram of the matching structure of the top cover and the battery cell according to an embodiment of the present application;

[0031] FIG7 is a schematic diagram of a connector according to an embodiment of the present application;

[0032] FIG8 is a cross-sectional view of a connector according to an embodiment of the present application;

[0033] FIG9 is a perspective view of another battery cell according to an embodiment of the present application;

[0034] FIG10 is a cross-sectional view of a partial structure of another battery cell corresponding to a top cover according to an embodiment of the present application.

[0035] Reference numerals:

[0036] 100: Shell; 101: Accommodating cavity; 200a: Top cover assembly; 200: Top cover; 200a: First surface; 200b: Second surface; 201: Concave cavity; 202: Raised portion; 210: Pole; 300: Pole core; 300a: Body; 310: Pole ear; 400: Connector; 401: Bend portion; M1: First gap; M2: Second gap; X: Height direction; Y: Length direction. Specific embodiments

[0037] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0041] The battery cells and battery packs provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0042] As shown in Figures 1 to 4, the battery cell according to some embodiments of the present application includes: a shell 100, a top cover assembly 200a, a pole core 300 and a connector 400; the shell 100 is provided with a accommodating cavity 101, the accommodating cavity 101 has an opening, the top cover assembly 200a includes a top cover 200 and a pole 210 passing through the top cover 200, the top cover 200 is sealed at the opening, the pole core 300 is provided in the accommodating cavity 101, and the pole core 300 includes a body 300. 0a and a pole ear 310 connected to the main body 300a, the pole ear 310 is arranged on the side of the main body 300a close to the top cover 200, and the connecting member 400 is arranged between the pole ear 310 and the top cover 200; the top cover 200 is provided with a concave cavity 201 at a position corresponding to the pole ear 310, one end of the connecting member 400 is connected to the pole 210, and the other end of the connecting member 400 is provided with a bending portion 401, the bending portion 401 is located in the concave cavity 201 and connected to the pole ear 310.

[0043] In an embodiment of the present application, the top cover 200 is provided with a recessed cavity 201 at a position corresponding to the tab 310 in the core 300. A connector 400 is disposed between the core 300 and the top cover 200, and one end of the connector 400 is bent to form a bent portion 401, so that the bent portion 401 is located within the recessed cavity 201 of the top cover 200 and connects to the tab 310. This effectively utilizes the structural space of the top cover 200, reducing the internal height space occupied by the connection between the connector 400 and the tab 310, thereby helping to improve the internal space utilization of the cell. Furthermore, by connecting the connector 400 to the tab 310 within the recessed cavity 201 of the top cover 200, the pressure on the tab 310 at the connection between the connector 400 and the tab 310 can be reduced while maintaining the internal space utilization of the cell. This reduces the risk of the tab 310 being significantly deformed and thus inserted into the core 300, thereby improving the safety performance of the cell.

[0044] Specifically, the battery cell includes a shell 100, a top cover assembly 200a, a pole core 300 and a connector 400. The shell 100 is provided with a accommodating cavity 101 with an open end. The top cover assembly 200a includes a top cover 200 and a pole 210. The pole 210 is passed through the top cover 200 and at least partially exposed to the outside of the top cover 200. The top cover 200 is sealed at the opening of the shell 100, and the pole core 300 is placed in the accommodating cavity 101 of the shell 100.

[0045] Among them, the pole core 300 includes a main body 300a and a pole ear 310. The pole ear 310 is arranged at one end of the main body 300a facing the top cover 200. The top cover 200 is provided with a cavity 201 at a position corresponding to the pole ear 310. The cavity 201 is recessed from the side of the top cover 200 toward the pole core 300 in a direction away from the pole core 300.

[0046] Furthermore, a connector 400 is provided between the pole core 300 and the top cover 200, so that one end of the connector 400 is connected to the pole post 210, and a bending portion 401 is provided at the other end of the connector 400, and the bending portion 401 is bent from the pole core 300 toward the top cover 200, and the bending portion 401 is located in the concave cavity 201, and the side of the bending portion 401 facing away from the top cover 200 is connected to the pole ear 310.

[0047] In some embodiments, as shown in FIG. 7 and FIG. 8 , the bending portion 401 and the connector 400 may be integrated into one structure. For example, the bending portion 401 may be formed by bending the other end of the connector 400 toward the top cover 200 .

[0048] In other embodiments, the bending portion 401 and the connecting member 400 may be provided as separate structures. For example, the connecting member 400 and the bending portion 401 may be processed separately, and the connecting member 400 and the bending portion 401 may be welded and fixed to obtain the connecting member 400 having the bending portion 401 at the end.

[0049] It can be understood that the top cover 200 usually has a certain thickness. By setting a cavity 201 in the top cover 200, the bent portion 401 of the connector 400 is located in the cavity 201, and the connection with the tab 310 is achieved in the cavity 201. This can effectively save the height space of the accommodating cavity 101 occupied by the connection part between the connector 400 and the tab 310, thereby improving the space utilization of the battery cell.

[0050] In addition, compared with the traditional battery cell structure, the cavity 201 set in the top cover 200 can provide reserved space for the connection between the pole tab 310 and the connector 400, thereby reducing the squeezing of the pole tab 310 by the connector 400 during the assembly process, and avoiding the risk of the pole tab 310 being significantly deformed and inserted upside down into the pole core 300.

[0051] In some embodiments, a positive electrode ear and a negative electrode ear may be provided on the main body 300a of the electrode core 300, and the top cover 200 is provided with a cavity 201 at positions corresponding to the positive electrode ear and the negative electrode ear. The connector 400 connected to the positive electrode ear and the connector 400 connected to the negative electrode ear are both provided with a bent portion 401, and the bent portion 401 of the connector 400 is located in the corresponding cavity 201 and is connected to the corresponding positive electrode ear or negative electrode ear.

[0052] The concave cavity 201 provided at the position corresponding to the positive electrode tab of the top cover 200 is the first concave cavity, and the concave cavity 201 provided at the position corresponding to the negative electrode tab of the top cover 200 is the second concave cavity. As shown in FIG3 , the first concave cavity and the second concave cavity can be spaced apart from each other, that is, the first concave cavity and the second concave cavity are two independent concave cavity structures.

[0053] As shown in FIG10 , the first cavity and the second cavity may be connected to each other, that is, the first cavity and the second cavity are connected to each other to form an integral cavity structure, which covers both the positive electrode tab and the negative electrode tab.

[0054] Optionally, as shown in FIG5 , the top cover 200 includes a first surface 200a and a second surface 200b opposite to each other, the first surface 200a faces the pole core 300 , the second surface 200b is a plane, and the cavity 201 extends from the first surface 200a toward the second surface 200b .

[0055] In an embodiment of the present application, the top cover 200 is provided to include a first surface 200a and a second surface 200b relative to each other, and a cavity 201 is provided to extend concavely from the first surface 200a toward the second surface 200b, thereby facilitating full utilization of the structural space of the top cover 200 so that the connecting portion between the connector 400 and the tab 310 is located within the cavity 201. In this way, the internal height space of the battery cell occupied by the connecting portion between the tab 310 and the connector 400 can be effectively saved, thereby helping to improve the space utilization rate of the battery cell.

[0056] Among them, the setting position of the cavity 201 on the first surface 200a of the top cover 200 matches the position of the pole ear 310 in the pole core 300, and the spatial size of the cavity 201 can be determined according to the structural size of the pole ear 310 so that the pole ear 310 can be connected to the connector 400 in the cavity 201.

[0057] At the same time, the second surface 200b of the top cover 200 is set to be a plane, so that the second surface 200b of the top cover 200 can cooperate with other components during installation and use.

[0058] Optionally, as shown in FIG. 6 , a protrusion 202 is provided on the second surface 200 b at a position corresponding to the cavity 201 , and the cavity 201 is recessed from the first surface 200 a and extends into the protrusion 202 .

[0059] In the embodiment of the present application, the top cover 200 is provided with a first surface 200a and a second surface 200b opposite to each other, a cavity 201 is provided to extend concavely from the first surface 200a toward the second surface 200b, and a raised portion 202 is provided on the second surface 200b of the top cover 200 so that the cavity 201 extends concavely into the raised portion 202. In this way, the space size of the cavity 201 in the top cover 200 can be increased, and more space can be provided for the connection between the connector 400 and the tab 310, thereby facilitating the connection between the tab 310 and the connector 400.

[0060] It will be understood that the pole 210 is inserted into the top cover 200, with at least a portion of the pole 210 exposed on the second surface 200b of the top cover 200. During installation and use, the exposed portion of the pole 210 is used to connect to other components, and a certain gap exists between the second surface 200b of the top cover 200 and other components. In this embodiment of the present application, a raised portion 202 is provided on the second surface 200b of the top cover 200 to fully utilize this gap. This allows the size of the cavity 201 to be increased without affecting the assembly and use of the top cover 200.

[0061] In some embodiments, a positive electrode ear and a negative electrode ear are provided in the electrode core 300, and a concave cavity 201 is provided at positions corresponding to the positive electrode ear and the negative electrode ear, respectively, on the top cover 200. A protrusion 202 can be provided at positions corresponding to the positive electrode ear and the negative electrode ear, respectively, on the second surface 200b of the top cover 200, so that the corresponding concave cavity 201 extends into the protrusion 202.

[0062] The structure of the raised portion 202 provided on the second surface 200b of the top cover 200 is compatible with the structure of the recessed cavity 201 provided on the first surface 200a of the top cover 200. That is, as shown in Figures 1 and 3, when the two recessed cavities 201 provided on the first surface 200a are independent of each other, the two raised portions 202 provided on the second surface 200b are also independent of each other. As shown in Figures 9 and 10, when the two recessed cavities 201 provided on the first surface 200a are connected to each other, the two raised portions 202 provided on the second surface 200b are an integrated structure.

[0063] In addition, the two concave cavities 201 provided on the first surface 200a may be independent of each other, while the two protrusions 202 provided on the second surface 200b may be an integrated structure.

[0064] It should be noted that the specific matching structure of the cavity 201 and the raised portion 202 provided in the top cover 200 can be flexibly set according to actual needs, and the embodiment of the present application does not limit this.

[0065] 6 , the raised portion 202 and the top cover 200 are integrally formed. By providing the raised portion 202 and the top cover 200 as an integrally formed part, the overall processing of the top cover 200 is facilitated, and the sealing and connection strength of the connection between the raised portion 202 and the top cover 200 are also improved.

[0066] In some embodiments, an arc transition structure can be provided at the connection between the raised portion 202 and the second surface 200b of the top cover 200 to avoid stress concentration at the connection between the raised portion 202 and the second surface 200b of the top cover 200, thereby reducing the problem of local cracking at the connection between the raised portion 202 and the second surface 200b during the use of the battery cell.

[0067] Optionally, as shown in FIG6 , the pole core 300 has a height direction X, and along the height direction X of the pole core 300 , the height of the protrusion 202 is H1; the pole 210 is at least partially exposed on the second surface 200 b , and the height of the exposed portion of the pole 210 is H2, satisfying: H1≤H2.

[0068] In the embodiment of the present application, by setting the height H1 of the protrusion 202 to be less than or equal to the height H2 of the exposed portion of the pole 210 exposed on the second surface 200 b, the space size of the cavity 201 can be increased and the interference of the protrusion 202 on the installation and use of the pole 210 can be reduced.

[0069] It should be noted that the height H1 of the protrusion 202 provided on the second surface 200 b of the top cover 200 can be determined according to the structural dimensions of the pole 210 provided in the top cover 200 , and this embodiment of the present application does not limit this.

[0070] Optionally, as shown in FIG. 6 , the protrusion 202 is spaced apart from the pole 210 , and a first gap M1 exists between the protrusion 202 and the pole 210 .

[0071] In the embodiment of the present application, the raised portion 202 in the top cover 200 is spaced apart from the pole 210, so that a first gap M1 is provided between the raised portion 202 and the pole 210, so as to reserve a certain space around the pole 210, thereby facilitating the connection operation of the pole 210 with other components and avoiding interference of the raised portion 202 with the installation and use of the pole 210.

[0072] Optionally, as shown in FIG6 , the pole core 300 has a height direction X and a length direction Y perpendicular to the height direction X. Along the length direction Y of the pole core 300 , the minimum size of the first gap M1 is D mm, satisfying: 0.5≤D≤100.

[0073] In the embodiment of the present application, by setting a reasonable value range for the minimum dimension D of the first gap M1 between the protrusion 202 and the terminal 210, a certain amount of space is reserved around the terminal 210 to facilitate the connection operation between the terminal 210 and other components. At the same time, the first gap M1 is prevented from being too large, thereby preventing it from affecting the structural configuration of the protrusion 202.

[0074] It is understood that if the first gap M1 between the protrusion 202 and the terminal 210 is too small, the protrusion 202 and the terminal 210 are too close, which will affect the connection operation of the terminal 210. If the first gap M1 between the protrusion 202 and the terminal 210 is too large, the structural size of the top cover 200 is limited, and the size of the protrusion 202 provided on the top cover 200 is too small to meet the setting requirements of the cavity 201.

[0075] Specifically, the minimum dimension D of the first gap M1 between the protrusion 202 and the pole 210 can be set to any value such as 0.5 mm, 1 mm, 5 mm, 10 mm, 20 mm, 50 mm, 70 mm, 90 mm, 100 mm, or a range between any two values.

[0076] Optionally, as shown in FIG6 , the cavity 201 has a bottom wall, and a second gap M2 exists between the bent portion 401 and the bottom wall.

[0077] In an embodiment of the present application, the cavity 201 is recessed from the first surface 200a of the top cover 200 toward the second surface 200b to form a bottom wall, and a second gap M2 is set between the bending portion 401 of the connector 400 and the bottom wall to reserve a certain space for the deformation of the bending portion 401, thereby facilitating the connection between the bending portion 401 and the tab 310, and avoiding the top cover 200 from rigidly squeezing the connector 400 and causing large deformation of the tab 310.

[0078] Optionally, the pole core 300 has a height direction X, and along the height direction X of the pole core 300 , the minimum size of the second gap M2 is H3 mm, satisfying: H3 ≥ 0.5.

[0079] In the embodiment of the present application, by setting a reasonable value range of the minimum size H3 of the second gap M2 between the bending portion 401 and the bottom wall, sufficient deformation space is reserved for the bending portion 401, thereby facilitating the connection between the bending portion 401 and the tab 310.

[0080] Specifically, the minimum size H3 of the second gap M2 between the bent portion 401 and the bottom wall can be set to any value such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1.0 mm, 1.5 mm, 2 mm, or a range between any two values.

[0081] Optionally, an embodiment of the present application further provides a battery pack, comprising the battery cell in the above embodiment.

[0082] In an embodiment of the present application, the top cover 200 is provided with a recessed cavity 201 at a position corresponding to the tab 310 in the core 300. A connector 400 is disposed between the core 300 and the top cover 200, and one end of the connector 400 is bent to form a bent portion 401, so that the bent portion 401 is located within the recessed cavity 201 of the top cover 200 and connects to the tab 310. This effectively utilizes the structural space of the top cover 200, reducing the internal height space occupied by the connection between the connector 400 and the tab 310, thereby helping to improve the internal space utilization of the cell. Furthermore, by connecting the connector 400 to the tab 310 within the recessed cavity 201 of the top cover 200, the pressure on the tab 310 at the connection between the connector 400 and the tab 310 can be reduced while maintaining the internal space utilization of the cell. This reduces the risk of the tab 310 being significantly deformed and thus inserted into the core 300, thereby improving the safety performance of the cell.

[0083] It should be noted that the battery pack in the embodiment of the present application includes the battery cell in any of the above embodiments. The specific structure of the battery cell can be found in the above content, and the embodiment of the present application will not be repeated here.

[0084] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and purpose of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, comprising: A housing (100), within which there is a receiving cavity (101), and the receiving cavity (101) has an opening; A top cover assembly (200a), the top cover assembly (200a) includes a top cover (200) and a pole column (210) passing through the top cover, and the top cover (200) seals the opening; An electrode core (300), the electrode core (300) is disposed within the receiving cavity (101), the electrode core (300) includes a body (300a) and an electrode tab (310) connected to the body (300a), and the electrode tab (310) is disposed on a side of the body (300a) close to the top cover (200); A connecting member (400), the connecting member (400) is disposed between the electrode tab (310) and the top cover (200); A concave cavity (201) is provided at a position corresponding to the electrode tab (310) on the top cover (200), one end of the connecting member (400) is connected to the pole column (210), and the other end of the connecting member (400) is provided with a bent portion (401), and the bent portion (401) is located within the concave cavity (201) and is connected to the electrode tab (310).

2. The battery cell according to claim 1, wherein, The top cover (200) includes a first surface (200a) and a second surface (200b) disposed opposite to each other, the first surface (200a) faces the electrode core (300), and the concave cavity (2) extends in a direction from the first surface (200a) toward the second surface (200b).

3. The battery cell according to claim 2, wherein, The second surface (200b) is a plane.

4. The battery cell according to claim 2, wherein, A convex portion (202) is provided at a position corresponding to the concave cavity (201) on the second surface (200b), and the concave cavity (201) extends from the first surface (200a) into the convex portion (202).

5. The battery cell according to claim 4, wherein, The electrode core (300) has a height direction (X), along the height direction (X) of the electrode core (300), the height of the convex portion (202) is H1; at least a part of the pole column (210) is exposed outside the second surface (200b), and the height of the exposed part of the pole column (210) is H2, satisfying: H1 ≤ H2.

6. The battery cell according to claim 4, wherein, The convex portion (202) and the pole column (210) are spaced apart, and there is a first gap (M1) between the convex portion (202) and the pole column (210).

7. The battery cell according to claim 6, wherein, The electrode core (300) has a height direction (X) and a length direction (Y) perpendicular to the height direction (X), along the length direction (Y) of the electrode core (300), the minimum dimension of the first gap (M1) is D mm, satisfying: 0.5 ≤ D ≤ 100.

8. The battery cell according to claim 4, wherein, The convex portion (202) and the top cover (200) are integrally formed.

9. The battery cell according to claim 4, wherein, An arc transition structure is provided at the connection between the convex portion (202) and the second surface (200b).

10. The battery cell according to claim 4, wherein, The number of the convex portions (202) and the concave cavities (201) is the same, and the structures are adapted to each other.

11. The battery cell according to claim 1, wherein, The concave cavity (201) has a bottom wall, and there is a second gap (M2) between the bent portion (401) and the bottom wall.

12. The battery cell according to claim 11, wherein, The electrode core (300) has a height direction (X). Along the height direction (X) of the electrode core (300), the minimum dimension of the second gap (M2) is H3 mm, satisfying: H3 ≥ 0.

5.

13. The battery cell according to claim 1, wherein, The bent portion (401) and the connecting member (400) are of an integral structure.

14. A battery pack, wherein, It includes an electrode cell according to any one of claims 1 - 13.

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