Terminal assembly and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a terminal assembly and a battery cell. According to the terminal assembly, a pole column comprises a first connecting part, a column body part and a second connecting part which are sequentially arranged in the axial direction, the first connecting part is arranged outside a battery cell, and the second connecting part is arranged inside the battery cell; the cylinder part is arranged in a connecting hole in the connecting piece in a penetrating manner, and the circumferential side wall of the connecting piece is connected with a mounting hole in the battery cell cover plate or the battery cell shell; the first insulating piece is pressed between the connecting piece and the second connecting part; the second insulating piece is pressed between the connecting piece and the first connecting part; and the sealing piece is pressed between the connecting piece and the second connecting part. The terminal assembly serving as a standardized part is directly mounted on the battery cell cover plate and the battery cell shell, so that the assembly requirements of the battery cell cover plates or the battery cell shells with different sizes are met, the assembly process of the battery cell is simplified, and the production efficiency of the battery cell is improved; and the first insulating part, the second insulating part and the sealing part are arranged to meet the requirements of the battery cell on insulativity and sealing property.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a terminal assembly and a battery cell. Background Art

[0002] Lithium-ion batteries, due to their high energy density and long cycle life, have been widely used in electric vehicles. A battery consists of a housing, a cover, and an electrode assembly mounted within the housing. The housing or cover is equipped with a pole to connect the internal circuit. In existing technology, the pole, seal, and plastic parts are all separate components, requiring multiple steps to assemble the pole and housing or cover. This process also requires repeated adjustments to the housing or cover, complicating production lines. This results in complex and costly battery manufacturing and hinders the development of a platform-based structure. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a terminal assembly and a battery cell to solve the problem that the existing assembly of the pole and the battery cell cover or shell requires multiple steps, resulting in complex battery cell manufacturing process and high cost.

[0004] A first aspect of the present invention provides a terminal assembly, wherein the terminal assembly comprises:

[0005] The pole comprises a first connecting portion, a column portion, and a second connecting portion arranged in sequence along the axial direction, wherein the first connecting portion is arranged outside the battery cell, and the second connecting portion is arranged inside the battery cell;

[0006] A connecting piece having a connecting hole, wherein the column portion is passed through the connecting hole, and the circumferential side wall of the connecting piece is connected to the mounting hole on the battery cover or the battery shell;

[0007] a first insulating member, disposed on a side of the connecting member facing the interior of the battery cell and pressed between the connecting member and the second connecting portion;

[0008] a second insulating member, disposed on a side of the connecting member facing the outside of the battery cell and pressed between the connecting member and the first connecting portion;

[0009] A sealing member is pressed between the connecting member and the second connecting portion.

[0010] Preferably, the circumferential side wall of the connector is formed with a protruding first boss, and the first boss is welded to the mounting hole; the first boss is arranged on the side of the connector facing the outside of the battery cell, and the surface of the first boss facing the outside of the battery cell and the surface of the connector facing the outside of the battery cell are spaced apart in the first direction.

[0011] Preferably, the circumferential side wall of the connector is also formed with a protruding second boss, and the second boss is arranged on the side of the connector facing the interior of the battery cell. The size of the second boss in the second direction is larger than the size of the first boss in the second direction, so that the terminal assembly as a whole extends into the mounting hole from one side inside the battery cell.

[0012] Preferably, a blocking portion protruding outward in the radial direction of the first insulating member is formed on the circumferential side wall of the first insulating member, and a dimension of the blocking portion in the second direction is larger than a maximum dimension of the connecting member in the second direction.

[0013] Preferably, the blocking portion is provided on a side of the first insulating member facing the interior of the battery cell.

[0014] Preferably, the pole is formed as a split structure, and the pole includes a first terminal and a second terminal assembled along a first direction, the first terminal includes the first connecting portion and part of the column portion, and the second terminal includes a second connecting portion and the remaining column portion except for the portion provided on the first terminal.

[0015] Preferably, the column portion on the first terminal is formed as a first column portion, the column portion on the second terminal is formed as a second column portion, one of the first column portion and the second column portion is provided with an assembly hole, the other of the first column portion and the second column portion is formed with a mounting protrusion extending into the assembly hole, and the assembly hole and the mounting protrusion are welded to form a welding portion.

[0016] Preferably, the pole is formed as an integrated structure, or the pole is formed as a split riveted structure.

[0017] Preferably, a portion of the sealing member extends into the connecting hole to separate the connecting member and the pole, and the sealing member is crimped to the second insulating member.

[0018] A second aspect of the present invention provides a battery cell comprising the terminal assembly described in any of the above technical solutions.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the terminal assembly of the present invention, the pole includes a first connecting portion, a column portion and a second connecting portion arranged in sequence along the axial direction; the connecting piece is provided with a connecting hole, the column portion is passed through the connecting hole, and the circumferential side wall of the connecting piece is connected to the mounting hole on the battery cover or the battery shell, so that the terminal assembly can be used as a standardized component and directly installed on the battery cover and the battery shell, meeting the assembly requirements of battery covers or battery shells of different sizes, simplifying the assembly production process of the battery cells, and improving the production efficiency of the battery cells; in addition, the first insulating piece is arranged on the side of the connecting piece facing the interior of the battery cell, and is pressed between the connecting piece and the second connecting portion; the second insulating piece is arranged on the side of the connecting piece facing the outside of the battery cell, and is pressed between the connecting piece and the first connecting portion; the sealing piece is pressed between the connecting piece and the second connecting portion, thereby ensuring the insulation and sealing performance of the connecting terminal, thereby meeting the insulation and sealing requirements of the battery cell.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a first structure of a terminal assembly provided by an embodiment of the present invention;

[0024] Figure 2 An exploded view of a first structure of a terminal assembly provided by an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a first structure of a terminal assembly provided by an embodiment of the present invention;

[0026] Figure 4 An exploded view of a second structure of a terminal assembly provided by an embodiment of the present invention;

[0027] Figure 5 A cross-sectional view of a second structure of a terminal assembly provided by an embodiment of the present invention;

[0028] Figure 6 An exploded view of a third structure of a terminal assembly provided by an embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of a third structure of a terminal assembly provided in an embodiment of the present invention.

[0030] Icon: 10-pole; 101-first connecting part; 102-column part; 1021-first column part; 1022-second column part; 1023-assembly hole; 1024-mounting protrusion; 103-second connecting part; 1031-ear connecting part; 11-first terminal; 12-second terminal; 20-welding part; 30-connector; 31-first boss; 32-second boss; 33-connecting hole; 40-first insulating part; 41-sealing part; 50-second insulating part; 60-sealing part; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0031] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0032] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0033] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0034] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0036] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0037] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0038] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0039] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0040] According to a first aspect of the present invention, a terminal assembly is provided, which specifically includes a pole 10 , a connector 30 , a first insulating member 40 , a second insulating member 50 and a sealing member 60 .

[0041] Hereinafter, the specific structure of the terminal assembly according to the present embodiment as described above will be described.

[0042] In this embodiment, if Figures 1 to 7 As shown, the pole 10 is used to connect the pole group inside the battery cell and the power supply module or power module outside the battery cell to realize power transmission. Specifically, the pole 10 includes a first connecting portion 101, a column portion 102 and a second connecting portion 103 arranged in sequence along the axial direction. The first connecting portion 101 is arranged outside the battery cell, and the second connecting portion 103 is arranged inside the battery cell. The second connecting portion 103 is connected to the pole ear on the pole group. The first connecting portion 101 and the second connecting portion 103 are arranged at both ends of the pole 10 in the axial direction, and both are formed into an annular structure protruding outward along the radial direction of the pole 10, such as a circular, elliptical or polygonal annular structure.

[0043] In this embodiment, if Figures 1 to 7 As shown, along the radial direction of the pole 10, a protruding tab connection portion 1031 is formed on the side of the second connection portion 103 away from the column portion 102. The tab connection portion 1031 is formed into a plate-like structure and is arranged parallel to the battery cover or battery shell with a mounting hole. The tabs are welded to the tab connection portion 1031. In this way, the tab connection is facilitated by the protruding tab connection portion 1031 structure. Preferably, the tabs are connected to the side of the tab connection portion 1031 facing the outside of the battery cell, so as to reduce the distance between the main body of the electrode group and the tab connection portion 1031 when the length of the tab is determined, thereby increasing the space inside the battery cell for accommodating the electrode group, thereby improving the energy density of the battery cell; in other optional embodiments, the tabs are connected to the side of the tab connection portion 1031 facing the inside of the battery cell.

[0044] It should be noted that the axial direction of the pole 10 is the first direction D1 described below, and the radial direction of the pole 10 is the second direction D2 described below.

[0045] In this embodiment, if Figures 2 to 7 As shown, a connecting hole 33 is opened on the connecting member 30, and the connecting hole 33 is a through hole, so that the connecting member 30 is formed into an annular structure. The connecting member 30 can be a circular, elliptical or polygonal annular structure. The column portion 102 is passed through the connecting hole 33, and the first connecting portion 101 and the second connecting portion 103 both extend out of the connecting hole 33. The circumferential side wall of the connecting member 30 is connected to the mounting hole on the battery cover or the battery shell. In this way, the terminal assembly can be used as a standardized component and directly installed on the battery cover and the battery shell to meet the assembly requirements of battery covers or battery shells of different sizes, thereby simplifying the assembly production process of the battery cell and improving the production efficiency of the battery cell.

[0046] In this embodiment, if Figures 1 to 7As shown, the first insulating member 40, the second insulating member 50 and the sealing member 60 are all formed into an annular structure to be sleeved on the column portion 102. Specifically, the first insulating member 40 is arranged on the side of the connector 30 facing the interior of the battery cell, and is pressed between the connector 30 and the second connector 103, so as to separate the second connector 103 and the connector 30 to play the role of insulation protection and reduce the risk of short circuit.

[0047] Furthermore, the second insulating member 50 is disposed on the side of the connector 30 facing the outside of the cell and is compressed between the connector 30 and the first connecting portion 101. This separates the first connecting portion 101 from the connector 30, providing insulation protection and further reducing the risk of short circuits. The first insulating member 40 and the second insulating member 50 can be made of insulating plastic, such as PP (polypropylene) or PPS (polyphenylene sulfide), as long as they can provide insulation protection.

[0048] Furthermore, the seal 60 can be an elastic and insulating sealing ring so that the inner wall of the seal 60 fits against the circumferential side wall of the column portion 102. The seal 60 is pressed between the connector 30 and the second connector 103, and generates compression under the action of the extrusion of the connector 30 and the second connector 103, thereby realizing the sealed assembly of the terminal assembly.

[0049] In this embodiment, if Figures 1 to 7 As shown, the circumferential side wall of the connector 30 is formed with a protruding first boss 31, and the first boss 31 is welded to the mounting hole on the cell cover or the cell shell, so that the terminal assembly and the cell shell or the cell cover are directly assembled through a welding process, making the cell assembly process simpler. Compared with the traditional cell assembly process, it saves steps, thereby improving the cell assembly efficiency and achieving cost reduction and efficiency improvement.

[0050] Specifically, the first boss 31 protrudes in the second direction D2 and forms an annular structure. The first boss 31 is positioned on the side of the connector 30 facing the exterior of the cell. This allows for assembly of the terminal assembly with the cell housing or cell cover plate on the exterior of the cell. The surface of the first boss 31 facing the exterior of the cell is spaced apart from the surface of the connector 30 facing the exterior of the cell in the first direction D1. This creates a welding space on the surface of the first boss 31 facing the exterior of the cell, facilitating welding and preventing weld marks from protruding from the exterior surface of the connector 30, which could increase the rate of cosmetic defects.

[0051] Furthermore, in this embodiment, Figures 1 to 7As shown, the circumferential side wall of the connector 30 is also formed with a protruding second boss 32, which protrudes along the second direction D2 and forms an annular structure. The second boss 32 is arranged on the side of the connector 30 facing the interior of the battery cell, and the size of the second boss 32 in the second direction D2 is larger than the size of the first boss 31 in the second direction D2, so that the terminal assembly as a whole extends into the mounting hole from one side of the interior of the battery cell, meeting the assembly requirement of assembling the terminal assembly with the pole group and then inserting it into the shell together with the pole group. The second boss 32 is arranged to enable axial positioning with the mounting hole before welding the terminal assembly to the battery cell cover or the battery cell shell, thereby determining the installation position of the terminal assembly and the pole group relative to the battery cell shell, thereby improving welding accuracy and welding quality.

[0052] It should be noted that an insulating protective member is provided on the side of the cell housing with the mounting hole facing the interior of the cell, or on the side of the cell cover facing the interior of the cell (the cell cover can be understood as a metal top cover, and the insulating protective member can be understood as the lower plastic in the existing cell structure) to separate the electrode group from the cell housing or cell cover, thereby forming an insulating protection. The side of the connector 30 facing the interior of the housing is coplanar with the side of the cell housing or cell cover facing the interior of the cell, so that the side of the first insulating member 40 facing the exterior of the cell is coplanar with the side of the insulating protective member facing the exterior of the cell.

[0053] Preferably, the thickness of the connecting member 30 in the first direction D1 is the same as the thickness of the battery cell casing or the battery cell cover.

[0054] Furthermore, in a preferred embodiment, Figures 1 to 7 As shown, the circumferential side wall of the first insulating member 40 is formed with a sealing portion 41 that protrudes radially outward along the first insulating member 40. The sealing portion 41 is formed into an annular structure. The size of the sealing portion 41 in the second direction D2 is larger than the maximum size of the connector 30 in the second direction D2. In this way, the sealing portion 41 can seal the gap between the connector 30 and the wall of the mounting hole, thereby ensuring insulation reliability.

[0055] Furthermore, preferably, Figure 3 、 Figure 5 and Figure 7 As shown, the blocking portion 41 is arranged on the side of the first insulating part 40 facing the inside of the battery cell, so as to meet the assembly requirements of the terminal assembly from the inside of the battery cell into the mounting hole, avoid assembly interference, and enable the blocking portion 41 to effectively cover the assembly gap between the connector 30 and the mounting hole.

[0056] In order to facilitate the assembly of the pole 10 on the terminal assembly, in the first embodiment, the first structure of the pole 10 is shown in FIG. Figures 1 to 3As shown, the pole 10 is formed as a split structure. Specifically, the pole 10 includes a first terminal 11 and a second terminal 12 assembled along a first direction D1, that is, the first terminal 11 and the second terminal 12 are arranged one above and one below along the first direction D1; preferably, the first terminal 11 includes a first connecting portion 101 and a portion of a column portion 102, and the second terminal 12 includes a second connecting portion 103 and the remaining column portion 102 except for the portion arranged on the first terminal 11, so that the first terminal 11 and the second terminal 12 are assembled on the column portion 102, thereby eliminating the need to destroy the structure of the first connecting portion 101 and the second connecting portion 103, thereby facilitating assembly while meeting the power transmission requirements.

[0057] In other optional embodiments, the first terminal 11 and the second terminal 12 are separately arranged on the first connecting portion 101 or the second connecting portion 103 (that is, the assembly surface where the first terminal 11 and the second terminal 12 contact each other is located on the first connecting portion 101 or the second connecting portion 103).

[0058] Specifically, in this embodiment, Figure 2 and Figure 3 As shown, the column portion 102 on the first terminal 11 is formed as a first column portion 1021, and the column portion 102 on the second terminal 12 is formed as a second column portion 1022. One of the first column portion 1021 and the second column portion 1022 is provided with an assembly hole 1023, and the assembly hole 1023 is a through hole. The other of the first column portion 1021 and the second column portion 1022 is formed with a mounting protrusion 1024 extending into the assembly hole 1023. The assembly hole 1023 and the mounting protrusion 1024 are welded to form a welding portion 20, so that it is convenient to put the connecting member 30, the sealing member 60, the first insulating member 40 and the second insulating member 50 on the column portion 102, so that the connecting member 30, the sealing member 60, the first insulating member 40 and the second insulating member 50 can all be clamped between the first connecting portion 101 and the second connecting portion 103.

[0059] Preferably, the assembly hole 1023 is opened on the second column portion 1022, the mounting protrusion 1024 is arranged on the side of the first column portion 1021 facing the second column portion 1022, and the welding portion 20 is arranged on the side of the pole 10 facing the inside of the battery cell, thereby ensuring the flatness of the surface of the first connecting portion 101 facing the outside of the battery cell, improving the surface quality, and enhancing the bearing capacity of the pole 10.

[0060] In the second embodiment, the second structure of the pole 10 is shown in FIG. Figure 4 and Figure 5As shown, the pole 10 is formed as a split riveted structure, the first connecting part 101 is formed as a block structure with a rivet hole, the column part 102 and the second connecting part 103 are formed as a whole, and the top of the column part 102 is riveted to the rivet hole on the first connecting part 101; after the column part 102 and the first connecting part 101 are riveted together, the two are welded and fixed on one side outside the battery cell.

[0061] In the third embodiment, the third structure of the pole 10 is shown in FIG. Figure 6 and Figure 7 As shown, the pole 10 is formed into an integrated structure, that is, the first connecting portion 101, the column portion 102 and the second connecting portion 103 are formed into one body. Before the connecting member 30, the first insulating member 40, the second insulating member 50 and the sealing member 60 are sleeved on the column portion 102, the first connecting portion 101 extends in a direction away from the second connecting portion 103, that is, Figure 7 To ensure smooth assembly of the connector 30, the first insulating member 40, the second insulating member 50 and the sealing member 60, the connector 30, the first insulating member 40, the second insulating member 50 and the sealing member 60 are sleeved onto the circumferential side wall of the column portion 102, the first connecting portion 101 is folded outwards so that the first connecting portion is formed as follows. Figure 6 and Figure 7 The structure shown extending radially outward along the circumferential side wall of the column portion 102 sandwiches the connector 30 , the first insulating member 40 , the second insulating member 50 and the sealing member 60 between the first connector 101 and the second connector 103 in the first direction D1 .

[0062] In a preferred embodiment, Figure 3 、 Figure 5 and Figure 7 As shown, part of the sealing member 60 extends into the connecting hole 33 and covers the column portion 102 to separate the connecting member 30 and the pole 10. As mentioned above, the sealing member 60 has insulating properties. For example, a sealing ring made of fluororubber can be used to avoid a short circuit caused by contact between the column portion 102 and the mounting hole. The sealing member 60 is crimped with the second insulating member 50, thereby improving the reliability and effectiveness of the insulation and sealing of the pole 10.

[0063] According to a terminal assembly provided by the present invention, the pole includes a first connecting part, a column part and a second connecting part arranged in sequence along the axial direction; the connecting piece is provided with a connecting hole, the column part is passed through the connecting hole, and the circumferential side wall of the connecting piece is connected to the mounting hole on the battery cover or the battery shell, so that the terminal assembly can be used as a standardized component and directly installed on the battery cover and the battery shell, meeting the assembly requirements of battery covers or battery shells of different sizes, simplifying the assembly production process of the battery cell, and improving the production efficiency of the battery cell; in addition, the first insulating piece is arranged on the side of the connecting piece facing the inside of the battery cell, and is pressed between the connecting piece and the second connecting part; the second insulating piece is arranged on the side of the connecting piece facing the outside of the battery cell, and is pressed between the connecting piece and the first connecting part; the sealing piece is pressed between the connecting piece and the second connecting part, thereby ensuring the insulation and sealing performance of the connecting terminal, thereby meeting the insulation and sealing requirements of the battery cell.

[0064] According to a battery cell provided by the present invention, the terminal assembly and the battery cell shell and / or the battery cell cover as described above can be directly installed as a whole in the mounting hole on the battery cell shell and / or the battery cell cover, thereby simplifying the assembly production process of the battery cell, improving the production efficiency of the battery cell, and meeting the insulation and sealing requirements of the battery cell.

[0065] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A terminal assembly, characterized in that: The terminal assembly comprises: The pole comprises a first connecting portion, a column portion, and a second connecting portion arranged in sequence along the axial direction, wherein the first connecting portion is arranged outside the battery cell, and the second connecting portion is arranged inside the battery cell; A connecting piece having a connecting hole, wherein the column portion is passed through the connecting hole, and the circumferential side wall of the connecting piece is connected to the mounting hole on the battery cover or the battery shell; a first insulating member, disposed on a side of the connecting member facing the interior of the battery cell and pressed between the connecting member and the second connecting portion; a second insulating member, disposed on a side of the connecting member facing the outside of the battery cell and pressed between the connecting member and the first connecting portion; A sealing member is pressed between the connecting member and the second connecting portion.

2. The terminal assembly according to claim 1, wherein: A protruding first boss is formed on the circumferential side wall of the connector, and the first boss is welded to the mounting hole; the first boss is arranged on the side of the connector facing the outside of the battery cell, and the surface of the first boss facing the outside of the battery cell and the surface of the connector facing the outside of the battery cell are spaced apart in the first direction.

3. The terminal assembly according to claim 2, wherein: The circumferential side wall of the connector is also formed with a protruding second boss, which is arranged on the side of the connector facing the interior of the battery cell. The size of the second boss in the second direction is larger than the size of the first boss in the second direction, so that the terminal assembly as a whole extends into the mounting hole from one side inside the battery cell.

4. The terminal assembly according to claim 1, wherein: A blocking portion protruding outward in the radial direction of the first insulating member is formed on the circumferential side wall of the first insulating member. The blocking portion has a dimension in the second direction that is larger than the maximum dimension of the connecting member in the second direction.

5. The terminal assembly according to claim 4, characterized in that The blocking portion is arranged on a side of the first insulating member facing the interior of the battery core.

6. The terminal assembly according to claim 1, wherein: The pole is formed into a split structure, and includes a first terminal and a second terminal assembled along a first direction, the first terminal includes the first connecting portion and a portion of the column portion, and the second terminal includes a second connecting portion and the remaining column portion except for the portion provided on the first terminal.

7. The terminal assembly according to claim 6, wherein: The column portion on the first terminal is formed as a first column portion, and the column portion on the second terminal is formed as a second column portion. One of the first column portion and the second column portion is provided with an assembly hole, and the other of the first column portion and the second column portion is formed with a mounting protrusion extending into the assembly hole. The assembly hole and the mounting protrusion are welded to form a welding portion.

8. The terminal assembly according to claim 1, wherein: The pole is formed as an integrated structure, or the pole is formed as a split riveted structure.

9. The terminal assembly according to claim 1, wherein: A portion of the sealing member extends into the connecting hole to separate the connecting member and the pole, and the sealing member is crimped to the second insulating member.

10. A battery cell, characterized in that: The terminal assembly comprises the terminal assembly according to any one of claims 1 to 9.

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