Battery monomer and battery pack

Abstract

The utility model discloses a single battery and a battery pack. The single battery comprises a shell, a battery cell, an electric connecting piece and a top cover assembly, a containing cavity is formed in the shell, the containing cavity is provided with an opening, the top cover assembly covers the opening in a sealing mode, the battery cell is arranged in the containing cavity, and a tab is arranged at the end, facing the top cover assembly, of the battery cell; the electric connecting piece comprises a tab connecting part and a lead-out part, the lead-out part is connected with the tab connecting part, and the extension direction of the lead-out part is intersected with the extension direction of the tab connecting part; the tab is wound and connected to the circumferential outer side of the tab connecting part; and one end, far away from the tab connecting part, of the lead-out part is connected with the top cover assembly. According to the battery monomer structure, the tabs are wrapped on the outer sides of the tab connecting parts, so that the contact area of the tabs and the electric connecting pieces can be increased, the overcurrent capacity between the battery cells and the electric connecting pieces is higher, meanwhile, the risk of inversely inserting the battery cells due to bending of the tabs can be avoided, and the safety and the use performance of the battery can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery cell and a battery pack. Background Art

[0002] With the continuous development of the new energy industry, battery systems have attracted much attention. As the smallest battery unit, when multiple battery cells are assembled into a battery monomer, it is usually necessary to use electrical connectors to connect multiple battery cells in series or in parallel. The function of the electrical connector is to connect the battery cells in series or in parallel to ensure that an electrical connection path is formed between the battery cells so that the battery monomer can provide electrical energy.

[0003] In the related art, an electrical connection sheet is usually used to connect the battery cells. One side of the electrical connection sheet is welded to the tabs of multiple battery cells, and the other side of the electrical connection sheet is welded to the pole column in the top cover. However, in the battery cells of the related art, there are welding problems such as cold welding and welding penetration during the welding process between the electrical connection sheet and the tab, which affects the current conduction capacity of the electrical connection sheet. In addition, during the core assembly process, the electrical connector squeezes the tab, which easily causes the tab to bend and reversely insert the battery cell, causing a short circuit problem. Utility Model Content

[0004] The present application aims to provide a battery cell and a battery pack, which can solve the problem of poor welding between the electrical connecting piece and the pole ear in the battery cell of the related art, and the problem of the electrical connector squeezing the pole ear during the core assembly process, resulting in the pole ear being inserted inverted into the battery cell.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a housing, a battery cell, an electrical connector, and a top cover assembly;

[0007] The housing is provided with a housing cavity, the housing cavity has an opening, the top cover assembly is sealed at the opening, the battery cell is arranged in the housing cavity, and one end of the battery cell facing the top cover assembly is provided with a pole ear;

[0008] The electrical connector includes a pole lug connecting portion and a lead-out portion, the lead-out portion is connected to the pole lug connecting portion, and an extension direction of the lead-out portion intersects with an extension direction of the pole lug connecting portion; the pole lug is wound and connected to the circumferential outer side of the pole lug connecting portion, and one end of the lead-out portion away from the pole lug connecting portion is connected to the top cover assembly.

[0009] Optionally, the electrical connector also includes a transition portion, an end of the pole lug connecting portion away from the pole lug is connected to the transition portion, an end of the lead-out portion away from the top cover assembly is connected to the transition portion, and an extension direction of the transition portion intersects with an extension direction of the pole lug connecting portion and an extension direction of the lead-out portion, respectively.

[0010] Optionally, there are at least two pole lug connecting portions, and at least two pole lug connecting portions are arranged in sequence and spaced apart along the extending direction of the transition portion.

[0011] Optionally, at least two of the tab connection portions are disposed on the same side of the transition portion; or, at least two of the tab connection portions are disposed on opposite sides of the transition portion.

[0012] Optionally, the tab connection portion and the transition portion are an integrally formed part; and / or the lead-out portion and the transition portion are an integrally formed part.

[0013] Optionally, the top cover assembly includes a top cover and a pole, the top cover is arranged at the opening of the accommodating cavity, the pole is arranged in the top cover, and one end of the lead-out portion away from the pole ear connecting portion is connected to the pole.

[0014] Optionally, a through hole is provided in the pole, and one end of the lead-out portion away from the pole lug connecting portion is passed through the through hole.

[0015] Optionally, the lead-out portion and the pole are an integrally formed part.

[0016] Optionally, the pole lug connection portion includes a welding portion and a limiting portion that are connected to each other; along the extension direction of the pole lug connection portion, the limiting portion is arranged at both ends of the welding portion, the limiting portion is connected to the transition portion, the pole lug is wound and connected to the circumferential outer side of the welding portion, and the limiting portion is used to limit the connection position of the pole lug.

[0017] Optionally, along an extension direction perpendicular to the tab connecting portion, a size of the welding portion is D1, and a size of the limiting portion is D2, satisfying: D2>D1.

[0018] Optionally, along an extension direction perpendicular to the tab connecting portion, a dimension D1 of the welding portion satisfies: 2 mm ≤ D1 ≤ 5 mm.

[0019] Optionally, along the extension direction of the pole lug connecting portion, the size of the welding portion is L1, and the size of the pole lug is L2, satisfying: L1>L2.

[0020] Optionally, the tab connecting portion is a columnar structure, and / or the lead-out portion is a columnar structure.

[0021] In a second aspect, an embodiment of the present application proposes a battery pack, comprising any of the battery cells described above.

[0022] In the embodiment of the present application, the electrical connector includes a tab connection part and a lead-out part, so that the extension direction of the tab connection part intersects with the extension direction of the lead-out part, and then the tab on the battery cell is wound and connected to the circumferential outer side of the tab connection part, and the end of the lead-out part away from the tab connection part is connected to the top cover assembly, and then the current of the battery cell can be led out by the electrical connector. The battery cell structure of the present application is adopted, and the tab is wrapped on the outer side of the tab connection part, which can not only increase the contact area between the tab and the electrical connector, and make the current flow capacity between the battery cell and the electrical connector stronger, but also avoid the risk of inverted insertion of the battery cell due to the bending of the tab, which can improve the safety and performance of the battery.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[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] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of connection between an electrical connector and a battery cell according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of an electrical connector according to an embodiment of the present application;

[0028] Figure 4 is a partial schematic diagram of another electrical connector according to an embodiment of the present application;

[0029] Figure 5 It corresponds to Figure 2 A cross-sectional view of a connection portion of a pole lug;

[0030] Figure 6 is a cross-sectional view of a connection structure between an electrical connector and a battery cell according to an embodiment of the present application;

[0031] Figure 7 is a cross-sectional view of a top cover assembly according to an embodiment of the present application;

[0032] Figure 8 is a schematic diagram of a pole according to an embodiment of the present application;

[0033] Fig. 9 is a cross-sectional view of a pole according to an embodiment of the present application;

[0034] Fig.10 It is a schematic diagram of the connection between another electrical connector and a pole according to an embodiment of the present application.

[0035] Reference numerals:

[0036] 10: Shell; 101: Accommodation cavity; 20: Battery cell; 210: Tab; 30: Electrical connector; 310: Tab connection portion; 311: Welding portion; 312: Limiting portion; 320: Lead-out portion; 330: Transition portion; 40: Top cover assembly; 410: Top cover; 420: Pole column; 421: Through hole; X: Extension direction of tab connection portion; Y: Extension direction of transition portion; Z: Extension direction of lead-out portion. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in detail below, and 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 should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0038] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[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 referred device or element 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 clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The battery cell and battery pack 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] like Figures 1 to 3 As shown, the battery cell according to some embodiments of the present application includes a shell 10, a battery cell 20, an electrical connector 30 and a top cover assembly 40; a housing cavity 101 is provided in the shell 10, the housing cavity 101 has an opening, the top cover assembly 40 covers the opening, the battery cell 20 is arranged in the housing cavity 101, and a pole ear 210 is provided at one end of the battery cell 20 facing the top cover assembly 40; the electrical connector 30 includes a pole ear connecting portion 310 and a lead-out portion 320, the lead-out portion 320 is connected to the pole ear connecting portion 310, and an extension direction of the lead-out portion 320 intersects with an extension direction of the pole ear connecting portion 310; the pole ear 210 is wound and connected to the circumferential outer side of the pole ear connecting portion 310, and an end of the lead-out portion 320 away from the pole ear connecting portion 310 is connected to the top cover assembly 40.

[0043] In the embodiment of the present application, the electrical connector 30 includes a tab connection portion 310 and a lead-out portion 320, so that the extension direction of the tab connection portion 310 intersects with the extension direction of the lead-out portion 320, and then the tab 210 on the battery cell 20 is wound and connected to the circumferential outer side of the tab connection portion 310, and the end of the lead-out portion 320 away from the tab connection portion 310 is connected to the top cover assembly 40, and then the current of the battery cell 20 can be led out by the electrical connector 30. With the battery cell structure of the present application, the tab 210 is wound and connected to the circumferential outer side of the tab connection portion 310, which can not only increase the contact area between the tab 210 and the electrical connector 30, but also make the current flow capacity between the battery cell 20 and the electrical connector 30 stronger, and at the same time, it can also avoid the risk of the tab 210 bending and inserting the battery cell 20, which can improve the safety and performance of the battery.

[0044] It is understandable that in a conventional battery cell, an electrical connection sheet is usually provided between the pole 420 of the top cover assembly 40 and the pole tab 210 of the battery cell 20, one side of the electrical connection sheet is welded to the pole 420, and the other side of the electrical connection sheet is welded to the pole tab 210. In order to meet the requirements of welding and assembly operations, the pole tab 210 is usually provided with a redundant part. When the core is assembled, the redundant part of the pole tab 210 will be bent, which may easily cause the pole tab 210 to be inserted into the battery cell 20 upside down, resulting in a risk of short circuit.

[0045] In the embodiment of the present application, an electrical connector 30 is provided between the top cover assembly 40 and the battery cell 20, and the electrical connector 30 is provided with a tab connection portion 310 at a position corresponding to the tab 210 on the battery cell 20, so that the tab 210 is wound and connected to the circumferential outer side of the tab connection portion 310, so that the risk of the tab 210 being bent and inserted into the battery cell 20 during assembly can be reduced. At the same time, by winding the tab 210 and connecting the tab connection portion 310, the contact area between the tab 210 and the electrical connector 30 can be increased, thereby improving the current flow capacity between the battery cell 20 and the electrical connector 30.

[0046] like Figure 3 As shown, the tab connection portion extends along the X direction, the lead portion extends along the Y direction, and the extension direction of the tab connection portion intersects with the extension direction of the lead portion, so as to better adapt to the spatial layout structure of the tab 210 and the pole 420 inside the battery cell.

[0047] In a specific application, the tab 210 can be wrapped around the outer circumferential side of the tab connection portion 310 by winding. Furthermore, the tab 210 can be connected and fixed to the tab connection portion 310 by laser welding or hot melting.

[0048] For example, the electrical connector 30 can be connected to a magnetic pulse welding device, and then based on the effect of electromagnetic induction heating, the magnetic pulse welding device is used to heat the connection position of the pole tab 210 and the pole tab connection portion 310, so that the pole tab 210 and the pole tab connection portion 310 are fixed by hot melt welding. Of course, other welding and fixing methods can be used between the pole tab 210 and the pole tab connection portion 310, which can be flexibly set according to actual conditions, and the embodiment of the present application is not limited to this.

[0049] In addition, in the embodiment of the present application, the tab 210 covers the outer circumferential side of the tab connection portion 310, which can greatly increase the welding area between the tab 210 and the electrical connector 30. For example, if the diameter of the tab connection portion 310 is 2-5 mm and the width of the tab 210 is 45 mm, the welding area can be 282.6-706.5 mm 2 Compared with the conventional method of connecting the electrical connection sheet to the tab 210 , the welding surface can be increased by several times.

[0050] It should be noted that the cross-sectional shape of the tab connection portion 310 includes but is not limited to a circle, an ellipse, a semicircle, a semi-ellipse, a triangle, a trapezoid, a quadrilateral and other polygons.

[0051] Alternatively, if Figure 3 As shown, the electrical connector 30 also includes a transition portion 330, an end of the pole lug connecting portion 310 away from the pole lug 210 is connected to the transition portion 330, and an end of the lead-out portion 320 away from the top cover assembly 40 is connected to the transition portion 330, and an extension direction Y of the transition portion 330 intersects with an extension direction X of the pole lug connecting portion 310 and an extension direction Z of the lead-out portion 320 respectively.

[0052] In an embodiment of the present application, a transition portion 330 is provided in the electrical connector 30, the lead-out portion 320 and the pole tab connection portion 310 are both connected to the transition portion 330, and an extension direction of the transition portion 330 intersects with an extension direction of the pole tab connection portion 310 and an extension direction of the lead-out portion 320, respectively. In this way, the structural layout of the battery cell can be flexibly adapted to meet the connection requirements inside the battery cell.

[0053] Alternatively, if Figure 3 As shown, there are at least two tab connection portions 310 , and the at least two tab connection portions 310 are arranged in sequence and spaced apart along the extension direction Y of the transition portion 330 .

[0054] In the embodiment of the present application, multiple tab connectors 310 are provided on the transition portion 330 so that the electrical connector 30 can be connected to the tabs 210 of multiple battery cells 20 at the same time, thereby meeting the connection requirements of large-size batteries. The arrangement direction of the multiple tab connectors 310 can be consistent with the stacking direction of the multiple battery cells 20 in the housing 10.

[0055] In addition, by providing a plurality of pole lug connecting portions 310 in the electrical connector 30, the assembly requirements of large-sized batteries can also be met. In large-sized batteries, since the pole lugs 210 of two adjacent battery cells 20 are far apart, the pole lug connecting portions 310 are provided at intervals in the electrical connector 30 so that each pole lug connecting portion 310 is connected to a corresponding pole lug. In this way, the connection requirements can be met and the space occupied by the electrical connector 30 can be saved.

[0056] Alternatively, if Figure 3 As shown, at least two tab connection portions 310 are arranged on the same side of the transition portion 330. That is, the connection positions of the tabs 210 of the multiple battery cells 20 and the electrical connector 30 are located on the same side of the transition portion 330, which can improve the regularity of the connection structure of the multiple battery cells 20 and help save space.

[0057] Optionally, at least two tab connection portions 310 are disposed on opposite sides of the transition portion 330. That is, tab connection portions 310 are disposed on both sides of the transition portion 330, respectively, so as to meet the requirements of staggered connection of tabs 210 of multiple battery cells 20.

[0058] Alternatively, if Figure 3 As shown, the tab connection portion 310 and the transition portion 330 are an integrally formed part; and / or, the lead-out portion 320 and the transition portion 330 are an integrally formed part.

[0059] In the embodiment of the present application, by providing at least one of the tab connection portion 310 and the lead-out portion 320 with the transition portion 330 as an integrally formed structure, it helps to improve the connection strength between the tab connection portion 310 and the transition portion 330, as well as the connection strength between the lead-out portion 320 and the transition portion 330.

[0060] Alternatively, if Figure 1 As shown, the top cover assembly 40 includes a top cover 410 and a pole 420 . The top cover 410 is disposed at the opening of the accommodating cavity 101 . The pole 420 is disposed in the top cover 410 . One end of the lead-out portion 320 away from the pole lug connecting portion 310 is connected to the pole 420 .

[0061] In the embodiment of the present application, the lead-out portion 320 of the electrical connector 30 is connected to the pole 420 in the top cover 410, and then the electrical connector 30 can be used to realize the electrical connection between the pole tab 210 and the pole 420, and the electric energy in the battery cell 20 is led out to the pole 420. At the same time, the structure of the electrical connector 30 in the present application can better meet the connection requirements inside the battery and save the occupied space because the extension direction Z of the lead-out portion 320 intersects with the extension direction X of the pole tab connection portion 310.

[0062] Alternatively, if Figures 7 to 9 As shown, a through hole 421 is provided in the pole 420 , and one end of the lead-out portion 320 away from the pole tab connecting portion 310 is passed through the through hole 421 .

[0063] In an embodiment of the present application, a through hole 421 is provided in the pole 420 so that the lead-out portion 320 of the electrical connector 30 is passed through the through hole 421. This facilitates the connection operation between the pole 420 and the electrical connector 30. At the same time, the welding operation between the pole 420 and the lead-out portion 320 can also be performed on the outside of the battery cell to prevent welding slag from falling into the interior of the battery cell.

[0064] It can be understood that when adopting the battery cell structure in the embodiment of the present application, during assembly, the pole ear connection portion 310 of the electrical connector 30 can be connected to the pole ear 210 of the battery cell 20 first, and then the top cover assembly 40 can be snapped into the shell 10, and the lead-out portion 320 of the electrical connector 30 can be passed through the through hole 421 of the pole 420, so that welding operations can be performed on the outside of the pole 420.

[0065] With the battery cell structure of the present application, the position between the electrical connector 30 and the tab 210 is relatively fixed when the cover is closed, thereby avoiding the risk of the tab 210 being bent significantly and causing the tab 210 to be inserted into the battery cell 20 in reverse. At the same time, welding operations can also be performed on the outside of the battery cell, which is convenient for actual operations, and external welding can also effectively prevent welding slag from falling into the inside of the battery cell.

[0066] Alternatively, if Fig.10 As shown, the lead-out portion 320 and the pole 420 are an integrally formed part.

[0067] In an embodiment of the present application, the lead-out portion 320 and the pole 420 can be arranged as an integrally formed structure, that is, the end of the lead-out portion 320 away from the transition portion 330 can be directly inserted into the top cover 410 and used as the pole 420, thereby simplifying the operation steps and saving processing costs. At the same time, it can also increase the structural strength of the connection position between the electrical connector 30 and the pole 420.

[0068] It should be noted that in actual applications, the structure of the lead-out portion 320 away from one end of the transition portion 330 can be set according to the structure of the pole 420, so that the end of the lead-out portion 320 is compatible with the structure of the pole 420, and then the end of the lead-out portion 320 can be directly passed through the top cover 410 and used as the pole 420.

[0069] Alternatively, if Figure 4 and Figure 5 As shown, the pole lug connection portion 310 includes a welding portion 311 and a limiting portion 312 that are connected to each other; along the extension direction X of the pole lug connection portion 310, the limiting portion 312 is arranged at both ends of the welding portion 311, the limiting portion 312 is connected to the transition portion 330, the pole lug 210 is wound and connected to the circumferential outer side of the welding portion 311, and the limiting portion 312 is used to limit the connection position of the pole lug 210.

[0070] In an embodiment of the present application, a welding portion 311 and a limiting portion 312 are provided in the pole ear connecting portion 310 so that the welding portion 311 can be used to realize the connection operation with the pole ear 210. At the same time, limiting portions 312 are provided at both ends of the welding portion 311 to facilitate the rapid positioning of the connection position between the pole ear 210 and the welding portion 311 during operation, thereby facilitating actual processing operations.

[0071] Alternatively, if Figure 5As shown, along the extension direction X perpendicular to the tab connection portion 310 , the size of the welding portion 311 is D1 , and the size of the limiting portion 312 is D2 , satisfying: D2>D1 .

[0072] In the embodiment of the present application, by setting the size D2 of the limiting portion 312 to be larger than the size D1 of the welding portion 311 , a step structure is formed at the connection position between the welding portion 311 and the limiting portion 312 , and the connection position of the tab 210 can be limited by the step structure.

[0073] Alternatively, if Figure 5 As shown, along the extending direction perpendicular to the tab connecting portion 310 , the dimension D1 of the welding portion 311 satisfies: 2 mm ≤ D1 ≤ 5 mm.

[0074] In the embodiments of the present application, by setting a reasonable value range of the size D1 of the welding portion 311, it is possible to avoid the welding portion 311 being too thin and affecting the structural strength and welding area of ​​the welding portion 311; at the same time, it is also possible to avoid the welding portion 311 being too thick, requiring a longer-sized pole ear 210 to cover the welding portion 311, resulting in waste of the pole ear 210.

[0075] Exemplarily, the size D1 of the welding portion 311 can be set to any value such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or a range between any two values.

[0076] Alternatively, if Figure 2 and Figure 5 As shown, along the extension direction X of the tab connection portion 310 , the size of the welding portion 311 is L1 , and the size of the tab 210 is L2 , satisfying: L1>L2.

[0077] In the embodiment of the present application, the length L1 of the welding portion 311 is set to be greater than the width L2 of the pole tab 210 so that the welding portion 311 has enough area for connection with the pole tab 210, thereby facilitating the actual winding operation and welding operation.

[0078] Alternatively, if Figure 3 As shown, the tab connection portion 310 is a columnar structure, and / or the lead-out portion 320 is a columnar structure.

[0079] In the embodiment of the present application, by providing the pole tab connection portion 310 with a columnar structure, it is convenient to wrap the pole tab 210 around the outer side of the pole tab connection portion 310 , and it can also save the space occupied by the pole tab connection portion 310 .

[0080] Accordingly, the lead-out portion 320 is provided in a columnar structure, which facilitates the connection between the lead-out portion 320 and the pole 420 in the top cover 410 , and at the same time, can also save the space occupied by the lead-out portion 320 .

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

[0082] In the embodiment of the present application, the electrical connector 30 includes a tab connection portion 310 and a lead-out portion 320, so that the extension direction of the tab connection portion 310 intersects with the extension direction of the lead-out portion 320, and then the tab 210 on the battery cell 20 is wound and connected to the circumferential outer side of the tab connection portion 310, and the end of the lead-out portion 320 away from the tab connection portion 310 is connected to the top cover assembly 40, and then the current of the battery cell 20 can be led out by the electrical connector 30. By adopting the battery cell structure of the present application, the tab 210 is wrapped on the outer side of the tab connection portion 310, which can not only increase the contact area between the tab 210 and the electrical connector 30, but also make the current passing capacity between the battery cell 20 and the electrical connector 30 stronger, and at the same time, it can also avoid the risk of the tab 210 bending and the battery cell 20 being inserted upside down, which can improve the safety and performance of the battery.

[0083] In the description of this specification, the description with reference to the terms "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 schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] 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 spirit 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, characterized in that: include: A housing (10), a battery cell (20), an electrical connector (30) and a top cover assembly (40); The housing (10) is provided with a housing cavity (101), the housing cavity (101) having an opening, the top cover assembly (40) being sealed at the opening, the battery cell (20) being arranged in the housing cavity (101), and a pole ear (210) being provided at one end of the battery cell (20) facing the top cover assembly (40); The electrical connector (30) comprises a pole lug connection portion (310) and a lead-out portion (320), wherein the lead-out portion (320) is connected to the pole lug connection portion (310), and an extension direction (Z) of the lead-out portion (320) intersects with an extension direction (X) of the pole lug connection portion (310); the pole lug (210) is wound and connected to the circumferential outer side of the pole lug connection portion (310), and one end of the lead-out portion (320) away from the pole lug connection portion (310) is connected to the top cover assembly (40).

2. The battery cell according to claim 1, characterized in that: The electrical connector (30) further comprises a transition portion (330), wherein one end of the pole lug connecting portion (310) away from the pole lug (210) is connected to the transition portion (330), and one end of the lead-out portion (320) away from the top cover assembly (40) is connected to the transition portion (330), and an extension direction (Y) of the transition portion (330) intersects with an extension direction (X) of the pole lug connecting portion (310) and an extension direction (Z) of the lead-out portion (320).

3. The battery cell according to claim 2, characterized in that: The number of the pole lug connection portions (310) is set to be at least two, and the at least two pole lug connection portions (310) are sequentially arranged at intervals along the extension direction (Y) of the transition portion (330).

4. The battery cell according to claim 3, characterized in that: At least two of the tab connection portions (310) are disposed on the same side of the transition portion (330); or, at least two of the tab connection portions (310) are disposed on two opposite sides of the transition portion (330).

5. The battery cell according to claim 2, characterized in that: The pole tab connection portion (310) and the transition portion (330) are an integrally formed part; and / or the lead-out portion (320) and the transition portion (330) are an integrally formed part.

6. The battery cell according to claim 1, characterized in that: The top cover assembly (40) comprises a top cover (410) and a pole (420), wherein the top cover (410) is arranged at the opening of the accommodating cavity (101), the pole (420) is arranged in the top cover (410), and one end of the lead-out portion (320) away from the pole lug connecting portion (310) is connected to the pole (420).

7. The battery cell according to claim 6, characterized in that: A through hole (421) is provided in the pole (420), and one end of the lead-out portion (320) away from the pole lug connecting portion (310) is passed through the through hole (421).

8. The battery cell according to claim 6, characterized in that: The lead-out portion (320) and the pole (420) are an integrally formed part.

9. The battery cell according to claim 2, characterized in that: The pole lug connection portion (310) comprises a welding portion (311) and a limiting portion (312) which are connected to each other; along the extension direction (X) of the pole lug connection portion (310), the limiting portion (312) is arranged at both ends of the welding portion (311), the limiting portion (312) is connected to the transition portion (330), the pole lug (210) is wound and connected to the circumferential outer side of the welding portion (311), and the limiting portion (312) is used to limit the connection position of the pole lug (210).

10. The battery cell according to claim 9, characterized in that: Along an extension direction perpendicular to the tab connection portion (310), the size of the welding portion (311) is D1, and the size of the limiting portion (312) is D2, satisfying: D2>D1.

11. The battery cell according to claim 9, characterized in that: Along an extension direction perpendicular to the tab connection portion (310), a dimension D1 of the welding portion (311) satisfies: 2 mm ≤ D1 ≤ 5 mm.

12. The battery cell according to claim 9, characterized in that: Along the extension direction (X) of the pole tab connecting portion (310), the size of the welding portion (311) is L1, and the size of the pole tab (210) is L2, satisfying: L1>L2.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The tab connection portion (310) is a columnar structure, and / or the lead-out portion (320) is a columnar structure.

14. A battery pack, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

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