Single battery and battery

Abstract

The utility model provides a single battery and a battery, and belongs to the technical field of power batteries. The single battery comprises an electrode assembly, a tab assembly and an insulating part, wherein the electrode assembly comprises a side face and an end face, and the tab assembly is located on the end face of the electrode assembly. The insulating part partially surrounds the side surface of the electrode assembly and is annular, the insulating part partially wraps the end surface of the electrode assembly, a receding opening is formed in the position, corresponding to the tab assembly, of the insulating part, so that the tab assembly is exposed, and the insulating part is connected with the electrode assembly. The battery comprises at least one single battery. Therefore, on the basis of the single battery structure, the connection mode between the insulating part and the electrode assembly is changed to replace the connection mode between the insulating part and the cover plate lower plastic, and meanwhile, the position of the tab assembly is avoided, so that the condition of unsmooth connection between the tab assembly and the electrode assembly is avoided, and the reliability of the battery is improved. The installation process is simplified, and the insulation performance in the battery cell is improved.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and particularly to a single cell and a battery. Background Art

[0002] In existing batteries, the internal insulation method in the battery cell is generally to set an insulating member between the cover plate assembly and the electrode assembly. Among them, the insulating member can be connected to the cover plate assembly by means of heat melting between the insulating member and the lower plastic in the cover plate assembly.

[0003] However, such a design has certain requirements for the height of the lower plastic in the cover plate assembly. Generally speaking, there are several protrusions on the surface of the lower plastic facing the electrode assembly, and each protrusion has a certain height, so that one end of the insulating member can be connected to the protrusion, and then the insulating member can be connected to the lower plastic through the protrusion. However, for the structure with a small height of the lower plastic, it is difficult for the insulating member to be stably connected to the lower plastic, which will affect the overall performance of the battery to a certain extent. Utility Model Content

[0004] This application provides a single cell and a battery. Based on the structure of the single cell, by changing the connection method between the insulating member and the electrode assembly, replacing the connection method between the insulating member and the lower plastic of the cover plate, and at the same time avoiding the position of the tab assembly, it is possible to avoid the situation of unsmooth connection between the tab assembly and the electrode assembly, simplify the installation process, and improve the internal insulation performance of the battery cell.

[0005] To achieve the above object, this application provides the following technical solutions:

[0006] In the first aspect of this application, a single cell is provided, including:

[0007] An electrode assembly, the electrode assembly including a side surface and an end surface;

[0008] A tab assembly, the tab assembly being located at the end surface of the electrode assembly;

[0009] An insulating member, a part of the insulating member surrounding the side surface of the electrode assembly and being annular, a part of the insulating member covering the end surface of the electrode assembly, and an avoidance opening being provided at a position corresponding to the tab assembly so that the tab assembly is exposed;

[0010] The insulating member is connected to the electrode assembly.

[0011] Based on the above technical solutions, this application can also be improved as follows.

[0012] In a possible implementation manner, the insulating member includes a first side portion and a second side portion;

[0013] The first side is connected to one side surface of the electrode assembly, and the second side surrounds the side surface of the electrode assembly and is connected to the first side, so that a part of the insulating member annularly wraps the side surface of the electrode assembly.

[0014] In a possible implementation, the insulating member includes a side wrapping layer and an end wrapping layer;

[0015] The side wrapping layer has a first side and a second side, the first side and the second side overlap, the side wrapping layer is annular in shape, and the side wrapping layer wraps the side surface of the electrode assembly and is connected to the side surface;

[0016] The end wrapping layer wraps the end surface of the electrode assembly, and the avoidance opening is located on the end wrapping layer.

[0017] In a possible implementation, the end wrapping layer includes a first end wrapping layer and a second end wrapping layer;

[0018] The first end wrapping layer wraps one end surface of the electrode assembly, and the avoidance opening is located on the first end wrapping layer;

[0019] The second end wrapping layer wraps the other end surface of the electrode assembly.

[0020] In a possible implementation, the single cell further includes: a bottom support member;

[0021] The bottom support member is located on the other end surface of the electrode assembly, and the bottom support member is located under the second end wrapping layer;

[0022] The bottom support member is used to support the electrode assembly.

[0023] In a possible implementation, the tab assembly includes: a first tab and a second tab;

[0024] Both the first tab and the second tab are located on the end surface of the electrode assembly, and both the first tab and the second tab are electrically connected to the electrode assembly through the avoidance opening.

[0025] In a possible implementation, the single cell further includes: a first adapter and a second adapter, and both the first adapter and the second adapter are located above the first end wrapping layer;

[0026] The projection size of the first adapter towards the end surface is larger than the size of the avoidance opening, so that the circumferential edge of the first adapter partially overlaps with the first end wrapping layer;

[0027] The projection size of the second adapter towards the end surface is larger than the size of the avoidance opening, so that the circumferential edge of the second adapter partially overlaps with the first end wrapping layer.

[0028] In a possible implementation, the first adapter is located above the first tab, and the first adapter is connected to the first tab through the avoidance opening;

[0029] The second adapter is located above the second tab, and the second adapter is connected to the second tab through the avoidance opening.

[0030] In a possible implementation, the single cell further includes: a housing;

[0031] The housing is located on the outer peripheral side of the electrode assembly, and the insulating member is located between the housing and the electrode assembly.

[0032] The second aspect of the present application provides a battery including at least one of the above single cells.

[0033] The present application provides a single cell and a battery. The single cell includes an electrode assembly, a tab assembly, and an insulating member. Among them, the electrode assembly includes a side surface and an end surface, and the tab assembly is located on the end surface of the electrode assembly. A part of the insulating member surrounds the side surface of the electrode assembly and is annular, a part of the insulating member covers the end surface of the electrode assembly, and the insulating member has an avoidance opening at a position corresponding to the tab assembly to expose the tab assembly, and the insulating member is connected to the electrode assembly. The battery includes at least one of the above single cells. In this way, on the basis of the single cell structure, the present application changes the connection manner between the insulating member and the electrode assembly, replaces the connection manner between the insulating member and the plastic under the cover plate, and at the same time avoids the position of the tab assembly, preventing the connection between the tab assembly and the electrode assembly from being unsmooth, simplifies the installation process, and improves the insulation performance inside the battery cell. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 Structural schematic diagram of a single cell provided by an embodiment of the present application;

[0036] Figure 2 Another perspective structural schematic diagram of a single cell provided by an embodiment of the present application;

[0037] Figure 3 Structural schematic diagram of a single cell with an adapter provided by an embodiment of the present application.

[0038] Description of the reference numerals:

[0039] 100 - Single cell;

[0040] 200 - Electrode assembly;

[0041] 210 - Side; 220 - End face;

[0042] 300 - Tab assembly;

[0043] 310 - First tab; 320 - Second tab;

[0044] 400 - Insulator;

[0045] 410 - Side coating layer; 411 - First side; 412 - Second side; 420 - End coating layer; 421 - Avoidance opening; 422 - First end coating layer; 423 - Second end coating layer;

[0046] 500 - Bottom support;

[0047] 600 - First adapter;

[0048] 700 - Second adapter;

[0049] 800 - Housing. Detailed implementation

[0050] As described in the background art, in the current stage of the battery, the insulator can be connected to the cover assembly by means of heat melting with the lower plastic in the cover assembly, thereby improving the insulation performance inside the battery cell.

[0051] Generally speaking, there will be several protrusions on the surface of the lower plastic facing the electrode assembly, and each protrusion has a certain height, so that one end of the insulator can be connected to the protrusion, and then the insulator can be connected to the lower plastic through the protrusion. However, the main problem of the insulation inside the battery cell at the current stage is that for the structure with a small height of the lower plastic, it is very difficult for the insulator to be stably connected to the lower plastic, which will affect the overall performance of the battery to a certain extent.

[0052] In view of the above technical problems, the embodiments of the present application provide a single battery and a battery. The single battery includes an electrode assembly, a tab assembly and an insulator. Among them, the electrode assembly includes a side and an end face, and the tab assembly is located on the end face of the electrode assembly. Part of the insulator surrounds the side of the electrode assembly and is annular, part of the insulator covers the end face of the electrode assembly, and there is an avoidance opening at the position corresponding to the tab assembly to expose the tab assembly, and the insulator is connected to the electrode assembly. The battery includes at least one of the above single batteries. In this way, on the basis of the single battery structure, the present application can change the connection method between the insulator and the electrode assembly, replace the connection method between the insulator and the lower plastic of the cover, and at the same time avoid the tab assembly, avoiding the situation of unsmooth connection between the tab assembly and the electrode assembly, simplifying the installation process, and improving the insulation performance inside the battery cell.

[0053] In order to make the above-mentioned objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] The embodiments of the present application provide a single cell and a battery. Based on the structure of the single cell, by changing the connection method between the insulating member and the electrode assembly, replacing the connection method between the insulating member and the plastic under the cover plate, and at the same time avoiding the position of the tab assembly, it is possible to avoid the situation where the connection between the tab assembly and the electrode assembly is not smooth, simplify the installation process, and improve the insulation performance inside the battery cell. The following will introduce the specific structures of the single cell and the battery provided by the embodiments of the present application with reference to the accompanying drawings.

[0055] Referring to Figure 1 , in the first aspect of the embodiments of the present application, a single cell 100 is provided. Among them, the single cell 100 can be a square shell battery cell, or the single cell 100 can be a cylindrical battery cell, which is not limited in the present application. In the embodiments of the present application, the single cell 100 may include an electrode assembly 200, a tab assembly 300, and an insulating member 400. In a possible implementation manner, the shape of the electrode assembly 200 may be a rectangular structure, and the shape of the electrode assembly 200 is not limited in the present application. The electrode assembly 200 may include a side surface 210 and an end surface 220, and the side surface 210 and the end surface 220 of the electrode assembly 200 may be perpendicular to each other. In the embodiments of the present application, the tab assembly 300 may be located on the end surface 220 of the electrode assembly 200, and the tab assembly 300 and the electrode assembly 200 may be fixedly connected. Among them, the tab assembly 300 may be fixedly connected to the electrode assembly 200 by welding or other means. In a possible implementation manner, a part of the insulating member 400 may surround the side surface 210 of the electrode assembly 200, and a part of the insulating member 400 may be annular on the side surface 210 of the electrode assembly 200. Additionally, a part of the insulating member 400 may also cover the end surface 220 of the electrode assembly 200. Among them, an avoidance opening 421 may be formed on the insulating member 400, and the avoidance opening 421 may be formed at a position corresponding to the tab assembly 300 on the insulating member 400, so that the tab assembly 300 is exposed. In this way, the insulating member 400 may be attached to the outer surface of the electrode assembly 200, so that the insulating member 400 is connected to the electrode assembly 200.

[0056] Referring to Figure 1 andFigure 2 , in the specific implementation of this embodiment, the insulating member 400 may include a first side portion 411 and a second side portion 412. Among them, in a possible implementation manner, the first side portion 411 may be connected to one side surface 210 of the electrode assembly 200, and the second side portion 412 may surround the side surface 210 of the electrode assembly 200, so that the second side portion 412 is connected to the first side portion 411, thereby enabling a part of the insulating member 400 to annularly cover the side surface 210 of the electrode assembly 200. In this way, through the connection between the first side portion 411 and the second side portion 412, a part of the insulating member 400 can be in contact with the side surface 210 of the electrode assembly 200.

[0057] Continue to refer to Figure 1 and Figure 2 , on the basis of the above embodiment, the insulating member 400 may further include a side covering layer 410 and an end covering layer 420. Among them, the side covering layer 410 may have a first side portion 411 and a second side portion 412. In a possible implementation manner, the first side portion 411 may be connected to one side surface 210 of the electrode assembly 200, and the second side portion 412 may surround the side surface 210 of the electrode assembly 200, so that the second side portion 412 overlaps with the first side portion 411. Among them, the overlapping parts of the first side portion 411 and the second side portion 412 may be connected to each other by means such as gluing. Of course, in some other embodiments, the first side portion 411 and the second side portion 412 may also be spliced and connected on the side surface 210 of the electrode assembly 200. It can be understood that the side covering layer 410 may be in a ring shape, and the side covering layer 410 can cover the side surface 210 of the electrode assembly 200, and the side covering layer 410 may be connected to the side surface 210 of the electrode assembly 200. Additionally, the end covering layer 420 can cover the end surface 220 of the electrode assembly 200. In a possible implementation manner, an avoidance opening 421 may be located on the end covering layer 420. The avoidance opening 421 may be formed on the end covering layer 420, so that the tab assembly 300 is exposed outside the end covering layer 420 through the avoidance opening 421, thereby facilitating the connection of the tab assembly 300. Of course, in some other embodiments, the avoidance opening 421 may be surrounded by the end covering layer 420, and the tab assembly 300 may also be exposed outside the end covering layer 420 through the avoidance opening 421, thereby facilitating the connection of the tab assembly 300.

[0058] Continue to refer to Figure 1, on the basis of the above embodiments, further, the number of the end coating layers 420 may be two, and the present application does not limit the number of the end coating layers 420 herein. In the embodiments of the present application, the end coating layer 420 may include a first end coating layer 422 and a second end coating layer 423. Among them, the first end coating layer 422 may be coated on one end face 220 of the electrode assembly 200, and the avoidance opening 421 may be located on the first end coating layer 422. In a possible implementation manner, the first end coating layer 422 may be coated on the end face 220 of the electrode assembly 200 where the tab assembly 300 is provided. Additionally, the second end coating layer 423 may be coated on the other end face 220 of the electrode assembly 200. In a possible implementation manner, the second end coating layer 423 may be coated on the end face 220 that is away from the electrode assembly 200 where the tab assembly 300 is provided. In this way, both the first end coating layer 422 and the second end coating layer 423 can be in contact with the end face 220 of the electrode assembly 200.

[0059] Continue to refer to Figure 2 , on the basis of the above embodiments, the single cell 100 may further include: a bottom support member 500. Among them, the bottom support member 500 may be located on the other end face 220 of the electrode assembly 200, and the bottom support member 500 may be located below the second end coating layer 423. It can be understood that the bottom support member 500 can be used to support the electrode assembly 200. In this way, the bottom support member 500 can be connected to the second end coating layer 423 by means such as gluing. Since the bottom support member 500 has a certain insulating and protective effect, setting the bottom support member 500 can improve the safety performance of the single cell 100.

[0060] Continue to refer to Figure 1 , on the basis of the above embodiments, further, the tab assembly 300 may include a first tab 310 and a second tab 320. Among them, in a possible implementation manner, both the first tab 310 and the second tab 320 may be located on the end face 220 of the electrode assembly 200, and the first tab 310 and the second tab 320 may respectively correspond to the avoidance opening 421 on the first end coating layer 422, so that the first tab 310 and the second tab 320 can be exposed through the avoidance opening 421, and further the first tab 310 and the second tab 320 can be electrically connected to the electrode assembly 200 through the avoidance opening 421.

[0061] Refer to Figure 3, based on the above embodiments, the single cell 100 may further include: a first adapter 600 and a second adapter 700. Among them, both the first adapter 600 and the second adapter 700 may be located on the first end covering layer 422. In a possible implementation, the projected size of the first adapter 600 towards the end face 220 may be larger than the size of the avoidance opening 421, so that the circumferential edge of the first adapter 600 partially overlaps with the first end covering layer 422. Correspondingly, the projected size of the second adapter 700 towards the end face 220 may also be larger than the size of the avoidance opening 421, so that the circumferential edge of the second adapter 700 partially overlaps with the first end covering layer 422. In this way, the overlapping part of the circumferential edge of the first adapter 600 and the first end covering layer 422 can be connected by means such as gluing, and similarly, the overlapping part of the circumferential edge of the second adapter 700 and the first end covering layer 422 can be connected by means such as gluing, so as to form a pre-positioning between the first adapter 600, the second adapter 700 and the first end covering layer 422, which is convenient for the subsequent connection between the first adapter 600 and the first tab 310, and the second adapter 700 and the second tab 320.

[0062] Continuing to refer to Figure 3 , based on the above embodiments, in combination with Figure 1 looking, the first adapter 600 may be located on the first tab 310, and the first adapter 600 may be connected to the first tab 310 through the avoidance opening 421. Correspondingly, the second adapter 700 may be located on the second tab 320, and the second adapter 700 may be connected to the second tab 320 through another avoidance opening 421. Among them, the first adapter 600 may be connected to the first tab 310 by other means such as welding, and the second adapter 700 may also be connected to the second tab 320 by other means such as welding.

[0063] Continuing to refer to Figure 2 , based on the above embodiments, the single cell 100 may further include: a housing 800. It can be understood that the housing 800 may be located on the outer peripheral side of the electrode assembly 200, and the insulating member 400 may be located between the housing 800 and the electrode assembly 200. Among them, in a possible implementation, the insulating member 400 may be sleeved on the electrode assembly 200, or the insulating member 400 may be attached to the outer side wall of the electrode assembly 200, or the insulating member 400 may be attached to the inner side wall of the housing 800. It can be understood that the housing 800 may have a certain protective effect, and by setting the housing 800, the safety performance of the single cell 100 can be improved.

[0064] In a second aspect of the embodiments of the present application, a battery (not shown in the figure) is provided, and the battery may include at least one of the above-mentioned single cells 100. In some embodiments of the present application, the battery may include a battery module formed by a plurality of stacked single cells 100 grouped together, or the battery may also directly form a battery pack by a plurality of stacked single cells 100 grouped together. It can be understood that the battery can be applied to battery systems in the fields of energy storage, battery swapping, power, etc.

[0065] In the embodiments of the present application, based on the structure of the single cell 100, by changing the connection manner between the insulating member 400 and the electrode assembly 200, replacing the connection manner between the insulating member 400 and the plastic under the cover plate, and at the same time avoiding the position of the tab assembly 300, the situation of unsmooth connection between the tab assembly 300 and the electrode assembly 200 is avoided, the installation process is simplified, and the insulation performance inside the battery cell is improved.

[0066] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0067] It should be noted that phrases such as "in specific implementation", "in some embodiments", "in this embodiment", and "exemplarily" mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when combining embodiments to describe specific features, structures, or characteristics, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0068] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used in the text can be used to describe any feature, structure, or characteristic in the sense of a singular, or can be used to describe a combination of features, structures, or characteristics in the sense of a plural. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage.

[0069] It should be easily understood that the terms "on...", "above...", and "over..." in the present disclosure should be interpreted in the broadest manner, so that "on..." not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above..." or "over..." not only includes the meaning of "above or over something", but also can include the meaning of "above or over something" without intermediate features or layers therebetween (i.e., directly on something).

[0070] In addition, for ease of description, spatial relative terms may be used in this document, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to another as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatial relative descriptors used in this document may be interpreted accordingly as well.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; 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 they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: An electrode assembly, the electrode assembly comprising a side surface and an end surface; A tab assembly, wherein the tab assembly is located on the end surface of the electrode assembly; An insulating member, part of which is arranged around the side surface of the electrode assembly and is in a ring shape, part of which is covered on the end surface of the electrode assembly, and a relief opening is provided at a position of the insulating member corresponding to the tab assembly so that the tab assembly is exposed; The insulating member is connected to the electrode assembly.

2. The single cell according to claim 1, characterized in that: The insulating member includes a first side portion and a second side portion; The first side portion is connected to one of the side surfaces of the electrode assembly, and the second side portion surrounds the side surface of the electrode assembly and is connected to the first side portion, so that a portion of the insulating member is annularly covered on the side surface of the electrode assembly.

3. The single cell according to claim 2, characterized in that: The insulating member comprises a side cladding layer and an end cladding layer; The side covering layer has the first side portion and the second side portion, the first side portion and the second side portion overlap, the side covering layer is in a ring shape, and the side covering layer covers the side surface of the electrode assembly and is connected to the side surface; The end covering layer covers the end surface of the electrode assembly, and the avoidance opening is located on the end covering layer.

4. The single cell according to claim 3, characterized in that: The end cladding layer comprises a first end cladding layer and a second end cladding layer; The first end coating layer is coated on one of the end surfaces of the electrode assembly, and the avoidance opening is located on the first end coating layer; The second end coating layer is coated on the other end surface of the electrode assembly.

5. The single cell according to claim 4, characterized in that: The single cell further comprises: a bottom support member; The bottom support member is located at the other end surface of the electrode assembly, and the bottom support member is located below the second end coating layer; The bottom support member is used to support the electrode assembly.

6. The single cell according to claim 4, characterized in that: The tab assembly comprises: a first tab and a second tab; The first pole tab and the second pole tab are both located on the end surface of the electrode assembly, and the first pole tab and the second pole tab are both electrically connected to the electrode assembly through the avoidance opening.

7. The single cell according to claim 6, characterized in that: The single cell further includes: a first adapter and a second adapter, wherein the first adapter and the second adapter are both located on the first end coating layer; The projection size of the first adapter toward the end surface is larger than the size of the avoidance opening, so that the circumferential edge of the first adapter partially overlaps with the first end cladding layer; The projection size of the second transition piece toward the end surface is larger than the size of the avoidance opening, so that the circumferential edge of the second transition piece partially overlaps with the first end cladding layer.

8. The single cell according to claim 7, characterized in that: The first adapter is located on the first pole lug, and the first adapter is connected to the first pole lug through the avoidance opening; The second adapter is located on the second pole lug, and the second adapter is connected to the second pole lug through the avoidance opening.

9. The single cell according to any one of claims 1 to 8, characterized in that: The single cell battery further includes: a housing; The shell is located on an outer peripheral side of the electrode assembly, and the insulating member is located between the shell and the electrode assembly.

10. A battery, characterized in that: The invention comprises at least one single cell according to any one of claims 1 to 9.

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