Battery monomer and battery pack

Abstract

The utility model discloses a single battery and a battery pack. The single battery comprises a shell, a top cover assembly, a battery cell and a connecting piece, the shell is provided with a containing cavity with an opening in one end, the top cover assembly is connected to the shell and seals the opening, the battery cell is arranged in the containing cavity, and the end, facing the top cover assembly, of the battery cell is provided with a tab; the connecting piece comprises a connecting part, the connecting part is provided with a first section and a second section which are connected, the first section is connected with the top cover assembly, the tab is wound on the circumferential outer side of the second section, the second section is provided with an accommodating space, and one end, far away from the battery cell, of the tab is arranged in the accommodating space. Therefore, by utilizing the insertion matching of the accommodating space and the end part of the tab, the winding operation of the tab on the outer side of the connecting part is facilitated, the connection firmness of the tab and the connecting piece can be increased, the contact area of the tab and the electric connecting piece can be increased, and the overcurrent capacity between the battery cell and the electric connecting piece is 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, power batteries have been widely used in electric vehicles, electric motorcycles, household appliances and other electric equipment due to their advantages such as high energy, long cycle life and reliable performance. The safety of power batteries is an important factor related to their development.

[0003] In the related art, the battery includes a shell, a battery cell and a top cover. The battery cell is installed in the shell. The battery cell is provided with a positive electrode ear and a negative electrode ear for drawing out current. The positive and negative electrode ears are respectively welded to the electrode terminals on the top cover through corresponding connecting pieces. During the battery assembly process, one side of the connecting piece is usually welded to the electrode ear first, and the other side is welded to the pole in the top cover, and then the top cover is buckled with the shell to complete the battery assembly.

[0004] However, when using the battery structure in the related art, there are welding problems such as cold welding and welding through when welding the connecting piece and the tab, which affects the connection firmness between the connecting piece and the tab. Utility Model Content

[0005] The present application aims to provide a battery cell and a battery pack, which can solve the problem of poor welding such as cold welding and welding through when welding the connecting piece and the pole ear in the battery structure using the related technology, thereby affecting the connection firmness between the connecting piece and the pole ear.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a housing, a top cover assembly, a battery cell, and a connector;

[0008] The shell is provided with a receiving cavity with an opening at one end, the top cover assembly is connected to the shell and covers the opening, the battery cell is arranged in the receiving cavity, and the battery cell is provided with a pole ear at one end facing the top cover assembly;

[0009] The connector includes a connecting portion, which has a first section and a second section connected to each other, the first section is connected to the top cover assembly, the pole ear is wound around the circumferential outer side of the second section, the second section is provided with a accommodating space, and the pole ear is arranged in the accommodating space at one end away from the battery cell.

[0010] Optionally, the second section is provided with a slot, and along an extension direction perpendicular to the connecting portion, the slot is recessed from the circumferential outer surface of the connecting portion toward the inside of the connecting portion to form the accommodating space.

[0011] Optionally, the second section is provided with an insertion hole, and along an extension direction perpendicular to the connecting portion, the insertion hole penetrates the second section of the connecting portion to form the accommodating space.

[0012] Optionally, the second section is provided with a first clamping portion and a second clamping portion, a gap is provided between the first clamping portion and the second clamping portion to form the accommodating space, the pole tab is wound around the first clamping portion and the second clamping portion, and one end of the pole tab away from the battery cell is clamped between the first clamping portion and the second clamping portion.

[0013] Optionally, a conductive adhesive layer is further provided in the gap, and the end of the pole ear is bonded and fixed to the first clamping part and / or the second clamping part through the conductive adhesive layer.

[0014] Optionally, along the extension direction of the connecting portion, the size of the accommodating space is larger than the size of the end of the electrode tab away from the battery cell.

[0015] Optionally, a welding plane is provided on the circumferential outer surface of the second section, and the pole tab is welded to the welding plane.

[0016] Optionally, the connecting member further includes a lead-out portion, one end of which is connected to the first section, the other end of which is connected to the top cover assembly, and an extension direction of the lead-out portion intersects with an extension direction of the connecting portion.

[0017] Optionally, the connecting portion is a columnar structure; and / or the lead-out portion is a columnar structure.

[0018] Optionally, the top cover assembly includes a cover plate, an insulating plate and an electrode terminal, the cover plate is sealed at the opening, the insulating plate is arranged on the side of the cover plate facing the battery cell, and the electrode terminal is sequentially passed through the cover plate and the insulating plate and connected to the first section.

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

[0020] In the embodiment of the present application, a connector is provided including a connecting portion, the connecting portion having a first section and a second section connected to each other, the first section is connected to the top cover assembly, the tab is wound around the circumferential outer side of the second section, and then the electrical connection between the top cover assembly and the tab can be realized by using the connector, and a receiving space is provided in the second section of the connecting portion, so that the end of the tab away from the battery cell is plugged into the receiving space. In this way, the plug-in cooperation between the receiving space and the end of the tab facilitates the winding operation of the tab outside the connecting portion, and can increase the connection firmness between the tab and the connector, and can also increase the contact area between the tab and the electrical connector, thereby improving the current capacity between the battery cell and the electrical connector.

[0021] 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

[0022] 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:

[0023] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of a partial structure of a battery cell according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of a first connecting member according to an embodiment of the present application;

[0026] Figure 4 is a partial structural schematic diagram of a first type of connector according to an embodiment of the present application;

[0027] Figure 5 This is one of the schematic diagrams of the first connection structure between the connector and the tab according to an embodiment of the present application;

[0028] Figure 6 This is a second schematic diagram of the connection structure between the first connector and the tab according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of a second connecting member according to an embodiment of the present application;

[0030] Figure 8 is a cross-sectional view of a second connecting member according to an embodiment of the present application;

[0031] Fig. 9 This is one of the schematic diagrams of the second type of connection structure between the connector and the tab according to an embodiment of the present application;

[0032] Fig.10 This is a second schematic diagram of the connection structure between the second connector and the tab according to an embodiment of the present application;

[0033] Fig.11 is a schematic diagram of a third connecting member according to an embodiment of the present application;

[0034] Fig.12 is a cross-sectional view of a second connecting member according to an embodiment of the present application;

[0035] Fig.13 This is one of the schematic diagrams of the third type of connection structure between a connector and a tab according to an embodiment of the present application;

[0036] Fig.14 This is the second schematic diagram of the connection structure between the third connector and the tab according to the embodiment of the present application;

[0037] Fig.15 is a schematic diagram of a fourth connecting member according to an embodiment of the present application;

[0038] Fig.16 is a schematic diagram of a top cover assembly according to an embodiment of the present application;

[0039] Fig.17 It is an exploded view of the top cover assembly according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 10: Shell; 20: Top cover assembly; 210: Cover plate; 220: Insulating plate; 230: Electrode terminal; 30: Battery cell; 310: Tab; 40: Connector; 410: Connecting portion; 410a: First section; 410b: Second section; 411: Accommodating space; 411a: Slot; 411b: Socket; 4111: First clamping portion; 4112: Second clamping portion; 4113: Gap; 412: Welding plane; 420: Lead-out portion; 430: Transition portion. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figures 1 to 3 As shown, according to some embodiments of the present application, the battery cell includes: a shell 10, a top cover assembly 20, a battery cell 30 and a connector 40; the shell 10 is provided with a accommodating cavity with an opening at one end, the top cover assembly 20 is connected to the shell 10 and covers the opening, the battery cell 30 is arranged in the accommodating cavity, and the battery cell 30 is provided with a pole ear 310 at one end facing the top cover assembly 20; the connector 40 includes a connecting portion 410, the connecting portion 410 has a first section 410a and a second section 410b connected to each other, the first section 410a is connected to the top cover assembly 20, the second section 410b has a circumferential outer side parallel to the extension direction of the second section 410b, the pole ear 310 is wound on the circumferential outer side of the second section 410b, the second section 410b is provided with an accommodating space 411, and the end of the pole ear 310 away from the battery cell 30 is arranged in the accommodating space 411.

[0048] In the embodiment of the present application, the connector 40 includes a connecting portion 410, the connecting portion 410 has a first section 410a and a second section 410b connected to each other, the first section 410a is connected to the top cover assembly 20, and the tab 310 is wound around the circumferential outer side of the second section 410b, so that the electrical connection between the top cover assembly 20 and the tab 310 can be achieved by using the connector 40, and the second section 410b of the connecting portion 410 is provided with a receiving space 411, so that the end of the tab 310 away from the battery cell 30 is plugged into the receiving space 411. In this way, the plug-in cooperation between the receiving space 411 and the end of the tab 310 can not only facilitate the winding operation of the tab 310 on the outer side of the connecting portion 410, but also increase the connection firmness between the tab 310 and the connector 40, and can also increase the contact area between the tab 310 and the electrical connector 40, thereby improving the current flow capacity between the battery cell 30 and the electrical connector 40.

[0049] In addition, by winding the pole tab 310 around the circumferential outer side of the connecting portion 410, not only the contact area between the pole tab 310 and the connecting portion 410 can be increased, but also the redundancy of the pole tab 310 can be reduced, thereby avoiding the risk of the pole tab 310 being invertedly inserted into the battery cell 30 due to bending of the redundant part of the pole tab 310 during the assembly process.

[0050] Specifically, the battery cell includes a housing 10 and a top cover assembly 20, the top cover assembly 20 is connected to the housing 10 to form a receiving cavity, the battery cell 30 is arranged in the receiving cavity, and further, a connector 40 is arranged between the top cover assembly 20 and the battery cell 30, the connector 40 includes a connecting portion 410, a first section 410a of the connecting portion 410 is connected to the top cover assembly 20, and a tab 310 on the battery cell 30 is wound around the circumferential outer side of the second section 410b of the connecting portion 410. The tab 310 may be wound around the entire circumferential outer surface of the second section 410b of the connecting portion 410, or wound around a portion of the circumferential outer surface of the second section 410b.

[0051] In a specific application, the pole tab 310 can be wound around the circumferential outer surface of the connecting portion 410 by winding or the like, and the pole tab 310 can also be connected and fixed to the connecting portion 410 by laser welding, hot melting, bonding or the like.

[0052] For example, the connector 40 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 position where the pole tab 310 and the connecting portion 410 are connected, so that the pole tab 310 and the connecting portion 410 are fixed by hot melt welding. Of course, other welding fixing methods can also be used between the pole tab 310 and the connecting portion 410, and the embodiment of the present application is not limited to this.

[0053] It can be understood that the connection between the first section 410a of the connecting portion 410 and the top cover assembly 20 can be a direct connection or an indirect connection, and can be flexibly set according to actual conditions, and the embodiment of the present application is not limited here.

[0054] Alternatively, if Figures 7 to 10 As shown, the second section 410 b is provided with a slot 411 a , and along an extension direction perpendicular to the connecting portion 410 , the slot 411 a is recessed from the circumferential outer surface of the connecting portion 410 toward the inside of the connecting portion 410 to form an accommodating space 411 .

[0055] In the embodiment of the present application, a slot 411a is provided in the second section 410b of the connecting portion 410 so that the end of the pole ear 310 is at least partially inserted into the slot 411a during connection, and then the pole ear 310 is wound around the circumferential outer surface of the second section 410b of the connecting portion 410. This not only facilitates the connection operation between the pole ear 310 and the connecting portion 410, but also improves the connection firmness between the pole ear 310 and the connector 40, and also increases the contact area between the pole ear 310 and the connecting portion 410.

[0056] Among them, Fig.10 As shown, along the extension direction perpendicular to the connecting portion 410, the length of the slot 411a is greater than the width of the end of the pole ear 310 away from the battery cell 30, so as to facilitate the insertion of the end of the pole ear 310 into the slot 411a. The specific structure of the slot 411a can be determined according to the structure of the pole ear 310, and the embodiment of the present application is not limited to this.

[0057] Alternatively, if Figures 11 to 14 As shown, the second section 410 b is provided with an insertion hole 411 b , and along an extension direction perpendicular to the connecting portion 410 , the insertion hole 411 b penetrates the second section 410 b of the connecting portion 410 to form an accommodating space 411 .

[0058] In the embodiment of the present application, a socket 411b is provided in the second section 410b of the connecting portion 410 so that the end of the pole ear 310 is at least partially inserted into the socket 411b during connection, and the pole ear 310 is then wound around the circumferential outer surface of the second section 410b of the connecting portion 410. This not only facilitates the connection operation between the pole ear 310 and the connecting portion 410, but also improves the connection firmness between the pole ear 310 and the connector 40, and also increases the contact area between the pole ear 310 and the connecting portion 410.

[0059] Among them, Fig.14 As shown, along the extension direction perpendicular to the connecting portion 410, the length of the socket 411b is greater than the width of the end of the pole ear 310 away from the battery cell 30, so as to facilitate the insertion of the end of the pole ear 310 into the socket 411b. The specific structure of the slot 411a can be determined according to the structure of the pole ear 310, and the embodiment of the present application is not limited to this.

[0060] Alternatively, if Figures 4 to 6 As shown, the second section 410b is provided with a first clamping portion 4111 and a second clamping portion 4112, and a gap 4113 is provided between the first clamping portion 4111 and the second clamping portion 4112 to form an accommodating space 411, the pole ear 310 is wound around the first clamping portion 4111 and the second clamping portion 4112, and one end of the pole ear 310 away from the battery cell 30 is clamped between the first clamping portion 4111 and the second clamping portion 4112.

[0061] In the embodiment of the present application, a first clamping portion 4111 and a second clamping portion 4112 are provided on the second section 410b of the connecting portion 410, and a gap 4113 is provided between the first clamping portion 4111 and the second clamping portion 4112, so that the end of the pole lug 310 can be extended into the gap 4113 during connection, and the end of the pole lug 310 can be clamped and fixed by using the first clamping portion 4111 and the second clamping portion 4112, thereby facilitating winding the pole lug 310 around the first clamping portion 4111 and the second clamping portion 4112, thereby realizing the connection between the pole lug 310 and the connecting portion 410, and also improving the connection firmness between the pole lug 310 and the connecting member 40.

[0062] Alternatively, if Figure 6 As shown, a conductive adhesive layer (not shown in the figure) is further provided in the gap 4113 , and the end of the tab 310 is bonded and fixed to the first clamping portion 4111 and / or the second clamping portion 4112 via the conductive adhesive layer.

[0063] In the embodiment of the present application, a conductive adhesive layer is provided in the gap 4113 between the first clamping portion 4111 and the second clamping portion 4112 so that the end of the pole ear 310 is bonded and fixed to the first clamping portion 4111 and / or the second clamping portion 4112 by the conductive adhesive layer. In this way, the conductivity between the pole ear 310 and the connecting portion 410 can be ensured and the connection strength between the pole ear 310 and the connecting portion 410 can be improved.

[0064] Among them, the conductive adhesive layer can be formed by conductive adhesive, wherein the conductive adhesive can include room temperature curing conductive adhesive, high temperature curing conductive adhesive or ultraviolet curing conductive adhesive, etc. Of course, other glue materials that are both conductive and adhesive can also be used, and the embodiments of the present application are not limited to this.

[0065] Alternatively, if Figure 3 As shown, along the extension direction of the connecting portion 410 , the size of the accommodating space 411 is larger than the size of the end of the tab 310 away from the battery cell 30 .

[0066] It can be understood that the end of the pole ear 310 is at least partially inserted into the accommodating space 411. By setting the length of the accommodating space 411 along the extension direction of the connecting portion 410 to be greater than the width of the end of the pole ear 310 away from the battery cell 30, the end of the pole ear 310 can be smoothly inserted into the accommodating space 411 during operation, which is convenient for actual operation.

[0067] The end of the tab 310 is inserted into the accommodating space, and the length of the accommodating space 411 refers to the length dimension of the accommodating space along the extending direction of the connecting portion 410 .

[0068] Alternatively, if Fig.15 As shown, a welding plane 412 is provided on the circumferential outer surface of the second section 410 b , and the pole tab 310 is welded to the welding plane 412 .

[0069] In the embodiment of the present application, a welding plane 412 is provided on the circumferential outer surface of the second section 410b of the connecting portion 410 so that the pole ear 310 and the connecting portion 410 can be welded and fixed at the welding plane 412, thereby facilitating the actual welding operation, reducing the problem of poor welding, and improving the connection firmness between the pole ear 310 and the connecting piece 40.

[0070] It can be understood that, in practical applications, the welding plane 412 can be a plane or a plane-like structure arranged on the circumferential outer surface of the connecting portion 410 . The welding plane 412 is provided to facilitate welding operations at the welding plane 412 .

[0071] Alternatively, if Figure 3 As shown, the connector 40 further includes a lead-out portion 420, one end of which is connected to the first section 410a, and the other end of which is connected to the top cover assembly 20, and the extension direction of the lead-out portion 420 intersects with the extension direction of the connecting portion 410. Preferably, the extension direction of the lead-out portion 420 is perpendicular to the extension direction of the connecting portion 410.

[0072] In the embodiment of the present application, a lead-out portion 420 is provided in the connector 40 so as to connect the top cover assembly 20 and the first section 410a of the connecting portion 410 using the lead-out portion 420, and an extension direction of the lead-out portion 420 is provided to intersect with an extension direction of the connecting portion 410 so as to better adapt to the spatial layout requirements inside the battery cell.

[0073] Alternatively, if Figure 3 As shown, the connecting portion 410 is a columnar structure; and / or the lead-out portion 420 is a columnar structure.

[0074] In the embodiment of the present application, by setting the connecting portion 410 in the connector 40 as a columnar structure, the winding operation of the pole ear 310 on the circumferential outer surface of the connecting portion 410 is facilitated, and it helps to increase the contact area between the pole ear 310 and the connecting portion 410, thereby improving the current flow capacity of the connector 40 and the pole ear 310.

[0075] Accordingly, by setting the lead-out portion 420 in the connector 40 as a columnar structure, it is convenient to connect the connector 40 with the top cover assembly 20, and at the same time, it can save the space occupied by setting the lead-out portion 420.

[0076] It should be noted that the cross-sectional shape of the connecting portion 410 or the lead-out portion 420 includes, but is not limited to, a circle, an ellipse, a semicircle, a semi-ellipse, a triangle, a trapezoid, a quadrilateral, and other polygons.

[0077] In some embodiments, Figure 3 As shown, the connector 40 further includes a transition portion 430, the first section 410a of the connector 410 is connected to the transition portion 430, and one end of the lead-out portion 420 away from the top cover assembly 20 is connected to the transition portion 430. By providing the transition portion 430 between the connector 410 and the lead-out portion 420, the connection structure of the connector 410 and the lead-out portion 420 can be flexibly provided, thereby better meeting the connection requirements inside the battery cell.

[0078] Furthermore, the connecting part 410 in the connecting member 40 can be provided in plurality, the first section 410a of each connecting part 410 is respectively connected to the transition part 430, and the first section 410b of the connecting part 410 extends in a direction away from the transition part 430. By providing a plurality of connecting parts 410 on the transition part 430, the connecting member 40 can be connected to the tabs 310 of a plurality of battery cells 30 at the same time, thereby meeting the connection requirements of large-sized batteries.

[0079] Furthermore, a plurality of connection parts 410 may be arranged in parallel and spaced order to facilitate the connection operation between each connection part 410 and the tab 310 of the corresponding battery cell 30. The arrangement direction of the plurality of connection parts 410 may be consistent with the stacking direction of the plurality of battery cells 30 in the housing 10.

[0080] In addition, by providing a plurality of connecting portions 410 in the connector 40, the assembly requirements of large-sized batteries can also be met. In large-sized batteries, since the distance between the pole ears 310 of two adjacent battery cells 30 is relatively far, by providing spaced connecting portions 410 in the connector 40, each connecting portion 410 is connected to a corresponding pole ear 310. In this way, the connection requirements can be met and the space occupied by the connector 40 can be saved.

[0081] Alternatively, if Fig.16 and Fig.17As shown, the top cover assembly 20 includes a cover plate 210, an insulating plate 220 and an electrode terminal 230. The cover plate 210 is sealed at the opening, the insulating plate 220 is arranged on the side of the cover plate 210 facing the battery cell 30, and the electrode terminal 230 is sequentially penetrated through the cover plate 210 and the insulating plate 220 and connected to the first section 410a.

[0082] In the embodiment of the present application, the cover plate 210 is connected to the housing 10, and the cover plate 210 is sealed at the opening of the accommodating cavity, so that the cover plate 210 and the housing 10 enclose the accommodating cavity, and an insulating plate 220 is provided on the side of the cover plate 210 facing the battery cell 30, so that the insulating plate 220 is used to insulate and isolate the cover plate 210 from the battery cell 30. Then, the electrode terminal 230 is sequentially penetrated through the cover plate 210 and the insulating plate 220, so that the first section 410a of the connecting portion 410 is connected to the electrode terminal 230, and then the connecting portion 410 can be used to realize the electrical connection between the tab 310 and the electrode terminal 230.

[0083] Optionally, an embodiment of the present application further provides a battery pack, comprising the battery cell in the above embodiment.

[0084] In the embodiment of the present application, the connector 40 includes a connecting portion 410, the connecting portion 410 has a first section 410a and a second section 410b connected to each other, the first section 410a is connected to the top cover assembly 20, and the tab 310 is wound around the circumferential outer side of the second section 410b, so that the electrical connection between the top cover assembly 20 and the tab 310 can be achieved by using the connector 40, and the accommodating space 411 is provided in the second section 410b of the connecting portion 410, so that the end of the tab 310 away from the battery cell 30 is plugged into the accommodating space 411. In this way, the plug-in cooperation between the accommodating space 411 and the end of the tab 310 can not only facilitate the winding operation of the tab 310 on the outer side of the connecting portion 410, but also increase the connection firmness between the tab 310 and the connector 40, and can also increase the contact area between the tab 310 and the electrical connector 40, thereby improving the current capacity between the battery cell 30 and the electrical connector 40.

[0085] 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.

[0086] 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 top cover assembly (20), a battery cell (30) and a connector (40); The shell (10) is provided with a receiving cavity with an opening at one end, the top cover assembly (20) is connected to the shell (10) and covers the opening, the battery cell (30) is arranged in the receiving cavity, and the battery cell (30) is provided with a pole ear (310) at one end facing the top cover assembly (20); The connecting member (40) comprises a connecting portion (410), wherein the connecting portion (410) has a first section (410a) and a second section (410b) connected to each other, wherein the first section (410a) is connected to the top cover assembly (20), the pole ear (310) is wound around the circumferential outer side of the second section (410b), the second section (410b) is provided with a receiving space (411), and an end of the pole ear (310) away from the battery cell (30) is arranged in the receiving space (411).

2. The battery cell according to claim 1, characterized in that: The second section (410b) is provided with a slot (411a), and along an extension direction perpendicular to the connecting portion (410), the slot (411a) is recessed from the circumferential outer surface of the connecting portion (410) toward the inside of the connecting portion (410) to form the accommodating space (411).

3. The battery cell according to claim 1, characterized in that: The second section (410b) is provided with an insertion hole (411b), and along an extension direction perpendicular to the connecting portion (410), the insertion hole (411b) penetrates the second section (410b) of the connecting portion (410) to form the accommodating space (411).

4. The battery cell according to claim 1, characterized in that: The second section (410b) is provided with a first clamping portion (4111) and a second clamping portion (4112); a gap (4113) is provided between the first clamping portion (4111) and the second clamping portion (4112) to form the accommodating space (411); the pole ear (310) is wound around the first clamping portion (4111) and the second clamping portion (4112); an end of the pole ear (310) away from the battery cell (30) is clamped between the first clamping portion (4111) and the second clamping portion (4112).

5. The battery cell according to claim 4, characterized in that: A conductive adhesive layer is also provided in the gap (4113), and the end of the pole ear (310) is bonded and fixed to the first clamping part (4111) and / or the second clamping part (4112) via the conductive adhesive layer.

6. The battery cell according to any one of claims 1 to 5, characterized in that: Along the extension direction of the connecting portion (410), the size of the accommodating space (411) is larger than the size of an end of the pole tab (310) away from the battery core (30).

7. The battery cell according to any one of claims 1 to 5, characterized in that: A welding plane (412) is provided on the circumferential outer surface of the second section (410b), and the pole lug (310) is welded to the welding plane (412).

8. The battery cell according to claim 1, characterized in that: The connecting member (40) further comprises a lead-out portion (420), one end of the lead-out portion (420) being connected to the first section (410a), the other end of the lead-out portion (420) being connected to the top cover assembly (20), and an extension direction of the lead-out portion (420) intersecting with an extension direction of the connecting portion (410).

9. The battery cell according to claim 8, characterized in that: The connecting portion (410) is a columnar structure; and / or the lead-out portion (420) is a columnar structure.

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

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