Battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell and a battery pack. According to the battery cell, a mounting hole is formed in a shell or a cover plate main body; the connecting assembly is arranged in the mounting hole, and the connecting assembly and the shell or the cover plate body define a sealed space; a first channel is arranged between the first insulating part and the connecting assembly and / or between the first insulating part and the shell or the cover plate main body; a second channel is arranged between the second insulating part and the connecting assembly and / or between the second insulating part and the shell or the cover plate main body; the first channel and the second channel are respectively communicated with the sealed space; and the sealing piece is arranged in the sealed space so as to disconnect the first channel and the second channel. The inside and outside of the battery cell are communicated through the first channel, the sealed space and the second channel under the condition that the sealing element is neglected, so that the condition that the sealing element is neglected but helium detection is passed is avoided, the sealing performance of the battery cell is ensured, the risk of liquid leakage failure of the battery cell is reduced, and the safety performance of the battery cell and the battery pack is further improved.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing day by day.

[0003] During the production process of lithium battery cells, liquid leakage failure has a significant impact on the cells. Currently, helium detection is used to detect the cells. Its basic principle is to fill helium into the workpiece to be detected, and then use a helium mass spectrometer leak detector to detect whether the workpiece has leaks. The sealing ring sleeved on the terminal post can ensure the sealing performance of the cell. The omission of the sealing ring is a common factor leading to liquid leakage of the cell. The omission may be due to human error or the situation where the sealing ring falls off during the transfer of the cell between different workstations. In the case of the omission of the sealing ring, since pressure needs to be applied during the assembly process of the terminal post, components such as the upper plastic and the lower plastic are pressed tightly against the terminal post and the cover plate or the housing, which may result in the situation of passing the helium detection. However, the cell with the omitted sealing ring cannot ensure the sealing performance during actual operation, and the risk of liquid leakage failure increases, and the safety performance of the cell cannot be guaranteed. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a battery cell and a battery pack to solve the problem that in the case of the omission of the sealing ring in the existing battery cell, there is still a possibility of passing the helium detection, thus unable to ensure the sealing performance of the battery cell during actual operation, resulting in an increased risk of liquid leakage failure of the battery cell and unable to ensure the use safety of the battery cell.

[0005] The first aspect of the present invention provides a battery cell, wherein the battery cell includes:

[0006] A housing or a cover plate main body, provided with an installation hole;

[0007] A connection component, arranged in the installation hole, and the connection component and the housing or the cover plate main body enclose a sealed space;

[0008] An insulating component, including a first insulating member clamped between the side of the housing or the cover plate main body facing the outside of the battery cell and the connection component, and a second insulating member clamped between the side of the housing or the cover plate main body facing the inside of the battery cell and the connection component. A first channel is provided between the first insulating member and the connection component and / or between the first insulating member and the housing or the cover plate main body; a second channel is provided between the second insulating member and the connection component and / or between the second insulating member and the housing or the cover plate main body; the first channel and the second channel are respectively communicated with the sealed space;

[0009] A seal is disposed in the sealed space to disconnect the communication between the first channel and the second channel.

[0010] Preferably, a recessed first groove is provided on one side of the housing or the cover body facing the outside of the battery cell to form the first channel;

[0011] And / or, a recessed first groove is provided on one side of the housing or the cover body facing the inside of the battery cell to form the second channel.

[0012] Preferably, a recessed second groove is provided on the insulating component to form the first channel and / or the second channel.

[0013] Preferably, a recessed third groove is provided on the connection component to form the first channel and / or the second channel.

[0014] Preferably, the connection component includes:

[0015] A pole column is inserted through the mounting hole. First connection parts and second connection parts protruding radially outward are respectively provided at both ends of the pole column in the axial direction. At least part of the first insulating part is clamped between the first connection part and the housing or the cover body, and at least part of the seal and part of the second insulating part are clamped between the second connection part and the housing or the cover body.

[0016] Preferably, the connection component includes:

[0017] A connecting piece is provided with a connection hole;

[0018] A pole column is inserted through the mounting hole and the connection hole. First connection parts and second connection parts protruding radially outward are respectively provided at both ends of the pole column in the axial direction. The first connection part presses the connecting piece against the housing or the cover body. The first insulating part is clamped between the connecting piece and the housing or the cover body, and at least part of the seal and part of the second insulating part are clamped between the second connection part and the housing or the cover body.

[0019] Preferably, the depth dimension of the first channel in the axial direction of the mounting hole is H1, and H1 = 0.1 mm to 0.5T1, where T1 is the thickness dimension of the part of the first insulating part clamped between the connection component and the housing or the cover body in the axial direction of the mounting hole.

[0020] Preferably, the depth dimension of the second channel in the axial direction of the mounting hole is H2, and H2 = 0.1 mm to 0.5T2, where T2 is the thickness dimension of the portion of the second insulating member clamped between the connection assembly and the housing or the cover body in the axial direction of the mounting hole.

[0021] Preferably, the projections of the first channel and the second channel on a plane perpendicular to the axial direction of the mounting hole overlap at least partially;

[0022] Alternatively, the projections of the first channel and the second channel on a plane perpendicular to the axial direction of the mounting hole are spaced apart.

[0023] The second aspect of the present invention provides a battery pack, including the battery cell described in any of the above technical solutions.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] For the battery cell of the present invention, a sealed space is formed by the connection assembly and the housing or the cover body; a first channel is provided between the first insulating member and the connection assembly and / or between the first insulating member and the housing or the cover body; a second channel is provided between the second insulating member and the connection assembly and / or between the second insulating member and the housing or the cover body; the first channel and the second channel are respectively communicated with the sealed space; a sealing member is arranged in the sealed space to disconnect the communication between the first channel and the second channel, so that when the sealing member is not installed, the inside and outside of the battery cell are communicated through the first channel, the sealed space and the second channel. Therefore, even when the insulating assembly is pressed against the connection assembly and the housing or the cover body, the situation where the sealing member is not installed but the helium leak detection passes will not occur, thereby ensuring the sealing performance of the battery cell, reducing the risk of battery cell leakage failure, and further improving the safety performance of the battery cell and the battery pack.

[0026] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of a connection assembly as a pole and a connecting member in the battery cell provided by an embodiment of the present invention;

[0029] Figure 2Schematic diagram of the connection component as a pole in the battery cell provided by the embodiment of the present invention;

[0030] Figure 3 Exploded structure diagram of the battery cell provided by the embodiment of the present invention.

[0031] Icon: 10 - housing or cover body; 11 - mounting hole; 21 - pole; 211 - first connection part; 212 - second connection part; 22 - connecting piece; 31 - first insulating part; 32 - second insulating part; 40 - sealing part; 41 - sealed space; 42 - first channel; 43 - second channel. Detailed implementation manners

[0032] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0033] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0034] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0035] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0036] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section as referred to in the examples described herein may also be termed a second component, element, region, layer, or section without departing from the teachings of the examples.

[0037] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "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 at other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0038] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0039] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures, but include changes in shape that occur during manufacturing.

[0040] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of this application.

[0041] According to a first aspect of the present invention, a battery cell is provided, which specifically includes a housing or a cover body 10, a connection assembly, an insulation assembly, and a seal 40.

[0042] In the following, the specific structure of the battery cell according to the present embodiment will be described as above.

[0043] In the present application, the battery cell can be a square shell battery cell, a blade battery cell or a cylindrical battery cell.

[0044] In the present embodiment, as Figure 1 and Figure 2 shown, the housing or the cover plate body 10 is provided with an installation hole 11, that is, it means that an installation hole 11 is provided on the housing of the battery cell, or an installation hole 11 is provided on the cover plate body of the battery cell. The installation hole 11 is a through-hole structure penetrating the housing or the cover plate body 10.

[0045] As Figure 1 and Figure 2 shown, the connection component is arranged in the installation hole 11, and both ends of the connection component extend out of the installation hole 11, and one end is arranged outside the battery cell, and the other end is arranged inside the battery cell; a sealing space 41 is formed between the connection component and the housing or the cover plate body 10, and the sealing member 40 is arranged in the sealing space 41, so as to ensure the sealing performance of the battery cell equipped with the connection component. The sealing member 40 can be an annular sealing ring made of fluororubber. The sealing member 40 is embedded in the sealing space 41 and generates a compression amount, so as to achieve the sealing effect.

[0046] As Figure 1 and Figure 2 shown, the insulating component includes a first insulating member 31 and a second insulating member 32. The first insulating member 31 is clamped between the side of the housing or the cover plate body 10 facing the outside of the battery cell and the connection component to separate the connection component from the side of the housing or the cover plate body 10 facing the outside of the battery cell, thereby forming insulation protection and reducing the risk of short circuit; the second insulating member 32 is clamped between the side of the housing or the cover plate body 10 facing the inside of the battery cell and the connection component to separate the connection component from the side of the housing or the cover plate body 10 facing the inside of the battery cell, thereby further forming insulation protection and reducing the risk of short circuit. The first insulating member 31 and the second insulating member 32 can be made of plastic parts.

[0047] In the present embodiment, as Figure 1 and Figure 2As shown, a first channel 42 is provided between the first insulating member 31 and the connection assembly and / or between the first insulating member 31 and the housing or the cover body 10. That is, the first channel 42 can be provided only between the first insulating member 31 and the connection assembly, or the first channel 42 can be provided only between the first insulating member 31 and the housing or the cover body 10. The first channel 42 can also be provided between the first insulating member 31 and the connection assembly and between the first insulating member 31 and the housing or the cover body 10, so that the first channel 42 is formed into a structure that can divide the flow and has two passages. A second channel 43 is provided between the second insulating member 32 and the connection assembly and / or between the second insulating member 32 and the housing or the cover body 10. That is, the second channel 43 can be provided only between the second insulating member 32 and the connection assembly, or the second channel 43 can be provided only between the second insulating member 32 and the housing or the cover body 10. The second channel 43 can also be provided between the second insulating member 32 and the connection assembly and between the second insulating member 32 and the housing or the cover body 10, so that the second channel 43 is formed into a structure that can divide the flow and has two passages. The first channel 42 and the second channel 43 are respectively communicated with the sealing space 41. The seal 40 provided in the sealing space 41 can disconnect the communication between the first channel 42 and the second channel 43. In this way, when the seal 40 is assembled, the helium gas entering the second channel 43 during the helium leak detection process cannot flow to the first channel 42 through the sealing space 41, or the helium gas entering the first channel 42 cannot flow to the second channel 43 through the sealing space 41. And when the seal 40 is not installed, the inside and outside of the battery cell are communicated through the first channel 42, the sealing space 41 and the second channel 43. Therefore, even when the insulating assembly is pressed against the connection assembly and the housing or the cover body 10 respectively, the situation where the seal 40 is not installed but the helium leak detection passes will not occur, thus ensuring the sealing performance of the battery cell, reducing the risk of battery cell leakage failure, and further improving the safety performance of the battery cell.

[0048] It should be noted that Figure 1 and Figure 2 show that both the first channel 42 and the second channel 43 are formed into structures that can divide the flow and have two passages. In the present application, Figure 1 and Figure 2 indicating that only one of the first channel 42 and the second channel 43 can achieve the situation of avoiding the seal 40 not being installed but the helium leak detection passing.

[0049] In an alternative embodiment, a recessed first groove is provided on the side of the housing or the cover body 10 facing the outside of the battery cell to form a first channel 42, and / or a recessed first groove is provided on the side of the housing or the cover body 10 facing the inside of the battery cell to form a second channel 43; specifically, the first insulating member 31 is attached to the side of the housing or the cover body 10 facing the outside of the battery cell and covers the first groove, so that the first insulating member 31 and the first groove enclose the first channel 42, and / or the second insulating member 32 is attached to the side of the housing or the cover body 10 facing the inside of the battery cell and covers the first groove, so that the second insulating member 32 and the first groove enclose the second channel 43.

[0050] In an alternative embodiment, a recessed second groove is provided on the insulating assembly to form a first channel 42 and / or a second channel 43. Specifically, when the second groove is provided on the side of the first insulating member 31 facing the connecting assembly, the connecting assembly is attached to the side of the first insulating member 31 facing the connecting assembly and covers the second groove, so that the connecting assembly and the first insulating member 31 enclose the first channel 42; when the second groove is provided on the side of the first insulating member 31 facing the housing or the cover body 10, the housing or the cover body 10 is attached to the side of the first insulating member 31 facing the housing or the cover body 10 and covers the second groove, so that the housing or the cover body 10 and the first insulating member 31 enclose the first channel 42; when the second groove is provided on the side of the second insulating member 32 facing the connecting assembly, the connecting assembly is attached to the side of the second insulating member 32 facing the connecting assembly and covers the second groove, so that the connecting assembly and the second insulating member 32 enclose the second channel 43.

[0051] For example, referring to Figure 3 as shown, the first channel 42 is provided on the first insulating member 31, and the second channel 43 is provided on the second insulating member 32; that is, in the structure shown in Figure 3 , a second groove is recessed inward from the side of the first insulating member 31 facing the cover body to form a first channel 42; a second groove is recessed inward from the side of the second insulating member 32 facing the terminal 21 to form a second channel 43.

[0052] In an alternative embodiment, a recessed third groove is provided on the connecting component to form the first channel 42 and / or the second channel 43. Specifically, when the third groove is provided on the side of the connecting component facing the first insulating member 31, the first insulating member 31 is attached to the side of the connecting component facing the first insulating member 31 and covers the third groove, thereby realizing that the connecting component and the first insulating member 31 enclose the first channel 42; when the third groove is provided on the side of the connecting component facing the second insulating member 32, the second insulating member 32 is attached to the side of the connecting component facing the second insulating member 32 and covers the third groove, thereby realizing that the connecting component and the second insulating member 32 enclose the second channel 43.

[0053] However, it should be noted that the formation methods of the first channel 42 and the second channel 43 are not limited to this. It can also be that groove structures are provided on two opposite components, and the two groove structures are buckled together to jointly enclose the first channel 42 or the second channel 43; for example, a third groove is provided on the side of the connecting component facing the first insulating member 31, and a second groove is provided on the side of the first insulating member 31 facing the connecting component, and the second groove and the third groove are buckled together to jointly enclose the first channel 42.

[0054] In a preferred embodiment, as Figure 1 and Figure 2 shown, the depth dimension of the first channel 42 in the axial direction of the mounting hole 11 is H1, and H1 = 0.1 mm to 0.5T1, where T1 is the thickness dimension of the part of the first insulating member 31 clamped between the connecting component and the housing or the cover body 10 in the axial direction of the mounting hole 11, and the unit is mm. In this way, it is ensured that when the seal 40 is not installed, the first channel 42 can connect the sealed space 41 and the outside of the battery cell, and the first channel 42 is prevented from being blocked by the force applied during assembly while ensuring the structural strength.

[0055] In a preferred embodiment, as Figure 1 and Figure 2 shown, the depth dimension of the second channel 43 in the axial direction of the mounting hole 11 is H2, and H2 = 0.1 mm to 0.5T2, where T2 is the thickness dimension of the part of the second insulating member 32 clamped between the connecting component and the housing or the cover body 10 in the axial direction of the mounting hole 11, and the unit is mm. In this way, it is ensured that when the seal 40 is not installed, the second channel 43 can connect the sealed space 41 and the inside of the battery cell, and the second channel 43 is prevented from being blocked by the force applied during assembly while ensuring the structural strength.

[0056] In a first alternative embodiment, the projections of the first channel 42 and the second channel 43 on a plane perpendicular to the axial direction of the mounting hole 11 overlap at least partially.

[0057] In the second alternative implementation, the projections of the first channel 42 and the second channel 43 on a plane perpendicular to the axial direction of the mounting hole 11 are spaced apart, such that the slotted positions on the housing or the cover body 10, on the connecting assembly, or on the insulating assembly are staggered, thereby avoiding a situation where the local structural strength is too low, or a situation where the first insulating member 31 is slotted on both sides in the axial direction of the mounting hole 11, resulting in excessive thinning or even penetration of the first insulating member 31 and causing insulation failure.

[0058] Further, in the first implementation, as Figure 2 shown, the connecting assembly is the pole column 21. The pole column 21 passes through the mounting hole 11, and at both ends of the pole column 21 in the axial direction, first connecting portions 211 and second connecting portions 212 protruding radially outward are respectively formed, such that boss structures are formed at both ends of the pole column 21 in the axial direction. At least a part of the first insulating member 31 is clamped between the first connecting portion 211 and the housing or the cover body 10, such that the first insulating member 31 is in direct contact with the pole column 21. At least a part of the sealing member 40 and a part of the second insulating member 32 are clamped between the second connecting portion 212 and the housing or the cover body 10. The third groove as described above can be provided on the first connecting portion 211 and the second connecting portion 212.

[0059] In the second implementation, as Figure 1 shown, the connecting assembly includes a connecting member 22 and a pole column 21. The connecting member 22 is formed as a block structure, and a connecting hole is formed in the connecting member 22. The connecting hole is formed as a through-hole structure penetrating the connecting member 22. The pole column 21 passes through the mounting hole 11, and one end of the pole column 21 protruding from the mounting hole 11 in the axial direction penetrates into the connecting hole. First connecting portions 211 and second connecting portions 212 protruding radially outward are respectively provided at both ends of the pole column 21 in the axial direction. A counterbore is formed on the hole wall of the connecting hole. The first connecting portion 211 abuts against the counterbore, such that the first connecting portion 211 presses the connecting member 22 against the housing or the cover body 10. The first insulating member 31 is clamped between the connecting member 22 and the housing or the cover body 10, such that the first insulating member 31 is in direct contact with the connecting member 22. At least a part of the sealing member 40 and a part of the second insulating member 32 are clamped between the second connecting portion 212 and the housing or the cover body 10. The third groove as described above can be provided on the connecting member 22 and the second connecting portion 212.

[0060] According to the present invention, a battery cell is provided. A connection component and a housing or a cover body enclose a sealed space. A first channel is provided between the first insulating member and the connection component and / or between the first insulating member and the housing or the cover body. A second channel is provided between the second insulating member and the connection component and / or between the second insulating member and the housing or the cover body. The first channel and the second channel are respectively communicated with the sealed space. A seal is arranged in the sealed space to disconnect the communication between the first channel and the second channel. In this way, when the seal is not installed, the inside and outside of the battery cell are communicated through the first channel, the sealed space and the second channel. Therefore, even when the insulating component is pressed against the connection component and the housing or the cover body, the situation where the seal is not installed but the helium leak detection passes will not occur, thereby ensuring the sealing performance of the battery cell, reducing the risk of battery cell leakage failure, and further improving the safety performance of the battery cell.

[0061] According to the present invention, a battery pack is provided, which includes the battery cell as described above. A plurality of battery cells are arranged in series and / or in parallel in the outer shell of the battery pack. During helium leak detection of each battery cell, the situation where the seal is not installed but the detection passes will not occur, reducing the risk of battery cell leakage failure and improving the safety performance of the battery pack.

[0062] Finally, it should be noted that the above embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The shell or cover body is provided with a mounting hole; A connecting component is arranged in the mounting hole, and the connecting component and the shell or cover body form a sealed space; An insulating component, comprising a first insulating member sandwiched between a side of the shell or cover body facing the outside of the battery cell and the connecting component, and a second insulating member sandwiched between a side of the shell or cover body facing the inside of the battery cell and the connecting component, a first channel is provided between the first insulating member and the connecting component and / or between the first insulating member and the shell or cover body; a second channel is provided between the second insulating member and the connecting component and / or between the second insulating member and the shell or cover body; the first channel and the second channel are respectively communicated with the sealed space; A sealing member is disposed in the sealing space to disconnect the first channel from the second channel.

2. The battery cell according to claim 1, characterized in that: A first concave groove is provided on one side of the shell or cover body facing the outside of the battery cell to form the first channel; And / or, a first concave groove is provided on a side of the shell or cover body facing the inside of the battery cell to form the second channel.

3. The battery cell according to claim 1, characterized in that: The insulating component is provided with a recessed second groove to form the first channel and / or the second channel.

4. The battery cell according to claim 1, characterized in that: The connecting component is provided with a concave third groove to form the first channel and / or the second channel.

5. The battery cell according to claim 1, characterized in that: The connection component comprises: A pole is passed through the mounting hole, and a first connecting portion and a second connecting portion protruding radially outward are respectively provided at two ends of the pole in the axial direction, at least part of the first insulating member is clamped between the first connecting portion and the shell or cover body, and at least part of the sealing member and part of the second insulating member are clamped between the second connecting portion and the shell or cover body.

6. The battery cell according to claim 1, characterized in that: The connection component comprises: A connecting piece having a connecting hole; A pole is passed through the mounting hole and the connecting hole, and the two ends of the pole in the axial direction are respectively provided with a first connecting portion and a second connecting portion protruding radially outward, the first connecting portion presses the connecting member toward the shell or the cover body, the first insulating member is clamped between the connecting member and the shell or the cover body, and at least part of the sealing member and part of the second insulating member are clamped between the second connecting portion and the shell or the cover body.

7. The battery cell according to claim 1, characterized in that: The depth dimension of the first channel in the axial direction of the mounting hole is H1, H1=0.1mm~0.5T1, T1 is the thickness dimension of the portion of the first insulating member sandwiched between the connecting assembly and the shell or cover body in the axial direction of the mounting hole.

8. The battery cell according to claim 1, characterized in that: The depth dimension of the second channel in the axial direction of the mounting hole is H2, H2=0.1mm~0.5T2, T2 is the thickness dimension of the portion of the second insulating member sandwiched between the connecting assembly and the shell or cover body in the axial direction of the mounting hole.

9. The battery cell according to claim 1, characterized in that: The projections of the first channel and the second channel on a plane perpendicular to the axial direction of the mounting hole are at least partially overlapped; Alternatively, the first channel and the second channel are arranged at an interval in their projections on a plane perpendicular to the axial direction of the mounting hole.

10. A battery pack, characterized in that: A battery cell comprising any one of claims 1 to 9.

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