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 tab assembly is positioned at one end of the electrode assembly. The insulating part is arranged on the electrode assembly in a sleeving mode from the end, provided with the electrode lug assembly, of the electrode assembly and attached to the outer surface of the electrode assembly, and a through opening is formed in the position, corresponding to the electrode lug assembly, of the insulating part so that the electrode lug assembly can be exposed. 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 provide 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 the insulating member with 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 a structure with a relatively 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 prevent the connection between the tab assembly and the electrode assembly from being blocked, 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] The first aspect of this application provides a single cell, including:

[0007] An electrode assembly;

[0008] A tab assembly located at one end of the electrode assembly;

[0009] An insulating member sleeved on the electrode assembly from the end of the electrode assembly where the tab assembly is provided and fitting with the outer surface of the electrode assembly. A through hole is provided at the position of the insulating member corresponding to the tab assembly to expose the tab assembly.

[0010] Based on the above technical solution, the present application can be further improved as follows.

[0011] In a possible implementation manner, the insulating member includes a first coating layer and two second coating layers connected to the first coating layer;

[0012] The two second coating layers are respectively located on both sides of the first coating layer;

[0013] The first coating layer is sleeved on one end surface of the electrode assembly provided with the tab assembly, and the through opening is opened in the first coating layer;

[0014] The second coating layer is coated on the remaining outer surface of the electrode assembly.

[0015] In one possible implementation, each second coating layer includes a main coating layer;

[0016] One end of the main covering layer is connected to the first covering layer;

[0017] The electrode assembly has two opposite first surfaces, and the main coating layer is coated on the first surfaces.

[0018] In a possible implementation, each second covering layer further includes two first protrusions, and the two first protrusions are respectively located on two sides of the main covering layer;

[0019] The electrode assembly has two opposite second surfaces, the second surfaces are perpendicular to the first surfaces, and the first protrusions are wrapped around the second surfaces.

[0020] In a possible implementation, corresponding first protrusions in two second covering layers overlap on the second surface of the electrode assembly.

[0021] In a possible implementation, each second covering layer further includes a second protrusion, and the second protrusion is located at an end of the main covering layer away from the first covering layer;

[0022] The second protrusion is coated on an end surface of the electrode assembly which is away from the tab assembly.

[0023] In a possible implementation, corresponding second protrusions in two second coating layers overlap on an end surface of the electrode assembly facing away from the tab assembly.

[0024] In a possible implementation, the single battery further includes: a switching assembly;

[0025] The adapter assembly is connected to the tab assembly through the through-hole.

[0026] In a possible implementation, the single battery further includes: a housing;

[0027] The housing includes a shell and a bottom support;

[0028] The shell is located on the outer peripheral side of the electrode assembly, and the insulating member is located between the shell and the electrode assembly;

[0029] The bottom support is located under the second protrusion, and the bottom support is used to support the electrode assembly.

[0030] A second aspect of the present application provides a battery, comprising at least one of the above-mentioned single cells.

[0031] 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 tab assembly is located at one end of the electrode assembly. The insulating member is sleeved on the electrode assembly from the end where the tab assembly is provided and is in contact with the outer surface of the electrode assembly. A through hole is provided at a position corresponding to the tab assembly of the insulating member so that the tab assembly is exposed. The battery includes at least one of the above single cells. In this way, based on the structure of the single cell, the present application can change the connection method between the insulating member and the electrode assembly, replace the connection method between the insulating member and the plastic under the cover plate, and at the same time avoid the position of the tab assembly, preventing the connection between the tab assembly and the electrode assembly from being smooth, simplifying the installation process, and improving the insulation performance inside the battery cell. Brief Description of the Drawings

[0032] 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, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic diagram of the overall structure of a single cell provided by an embodiment of the present application;

[0034] Figure 2 It is an expanded structure schematic diagram of the insulating member of a single cell provided by an embodiment of the present application;

[0035] Figure 3 It is a partial exploded schematic diagram of a single cell provided by an embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of the structure of a single cell from another angle provided by an embodiment of the present application.

[0037] Description of the Reference Numerals:

[0038] 100 - Single cell;

[0039] 200 - Electrode assembly;

[0040] 210 - First surface; 220 - Second surface;

[0041] 300 - Tab assembly;

[0042] 310 - First tab; 320 - Second tab;

[0043] 400 - Insulating member;

[0044] 410 - First coating layer; 411 - Through hole; 420 - Second coating layer; 421 - Main coating layer; 422 - First protrusion; 423 - Second protrusion;

[0045] 500 - Adapter assembly;

[0046] 510 - First adapter; 520 - Second adapter;

[0047] 600 - Outer shell;

[0048] 610 - Housing; 620 - Bottom support member. Detailed implementation manner

[0049] As described in the background art, in the current stage of batteries, the insulating member can be connected to the cover plate assembly by means of heat melting the lower plastic in the insulating member and the cover plate assembly, thereby improving the insulation performance inside the battery cell.

[0050] 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 insulating member can be connected to the protrusion, and then the insulating member 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 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.

[0051] 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, an ear assembly, and an insulating member. Among them, the ear assembly is located at one end of the electrode assembly. The insulating member is sleeved on the electrode assembly from the end of the electrode assembly where the ear assembly is provided and is attached to the outer surface of the electrode assembly. There is a through hole at the position of the insulating member corresponding to the ear assembly to expose the ear assembly. The battery includes at least one of the above single batteries. In this way, based on the structure of the single battery, the present application can change the connection method between the insulating member and the electrode assembly, replace the connection method between the insulating member and the lower plastic of the cover plate, and at the same time avoid the position of the ear assembly, preventing the connection between the ear assembly and the electrode assembly from being smooth, simplifying the installation process, and improving the insulation performance inside the battery cell.

[0052] In order to make the above 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 of the embodiments. Based on the embodiments of 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.

[0053] 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 mode between the insulating member and the electrode assembly, replacing the connection mode between the insulating member and the plastic under the cover plate, and at the same time avoiding the position of the tab assembly, preventing the connection between the tab assembly and the electrode assembly from being unsmooth, simplifying the installation process, and improving 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.

[0054] Reference Figure 1 , the first aspect of the embodiments of the present application provides a single cell 100. Among them, the single cell 100 can be a square shell battery cell, or the single cell 100 can be a cylindrical battery cell, and the present application does not limit this here. In the embodiments of the present application, the single cell 100 can 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 can be a rectangular structure, and the present application does not limit the shape of the electrode assembly 200 here. In the embodiments of the present application, the tab assembly 300 can be located at one end of the electrode assembly 200, and the tab assembly 300 and the electrode assembly 200 can be fixedly connected. Among them, the tab assembly 300 and the electrode assembly 200 can be fixedly connected by welding or other means. In a possible implementation manner, the insulating member 400 can be sleeved on the outer surface of the electrode assembly 200. It can be understood that the insulating member 400 can be sleeved on the electrode assembly 200 from the end of the electrode assembly 200 where the tab assembly 300 is provided, and the insulating member 400 can be attached to the outer surface of the electrode assembly 200. In a possible implementation manner, a through hole 411 can be formed on the insulating member 400, and the through hole 411 can be formed at a position corresponding to the tab assembly 300 on the insulating member 400, so that the tab assembly 300 is exposed.

[0055] Reference Figure 2, in the specific implementation of this embodiment, the insulating member 400 may include a first coating layer 410 and a second coating layer 420. Among them, the first coating layer 410 may be connected to the second coating layer 420. In a possible implementation manner, the number of the second coating layers 420 may be two, and the present application does not limit the number of the second coating layers 420 herein. In the embodiment of the present application, taking the number of the second coating layers 420 as two as an example, the two second coating layers 420 may be respectively located on both sides of the first coating layer 410. Among them, the first coating layer 410 may be sleeved on one end face of the electrode assembly 200 provided with the tab assembly 300. In a possible implementation manner, a through hole 411 may be formed in the first coating layer 410, so that the tab assembly 300 is exposed outside the first coating layer 410 through the through hole 411, thereby facilitating the connection of the tab assembly 300. In addition, the second coating layer 420 may be coated on the remaining outer surface of the electrode assembly 200, so that the insulating member 400 is in contact with the outer surface of the electrode assembly 200.

[0056] Continue to refer to Figure 2 , on the basis of the above embodiment, further, each second coating layer 420 may include a main coating layer 421. Among them, one end of the main coating layer 421 may be connected to the first coating layer 410. Additionally, continue to refer to Figure 1 , the electrode assembly 200 may have a first surface 210. Among them, in a possible implementation manner, the number of the first surfaces 210 may be two, and the two first surfaces 210 are arranged opposite to each other. It can be understood that the main coating layer 421 may be coated on the first surface 210, so that the first surface 210 of the electrode assembly 200 is in contact with the main coating layer 421.

[0057] Continue to refer to Figure 2 , on the basis of the above embodiment, further, each second coating layer 420 may further include a first protrusion 422. Among them, in a possible implementation manner, the number of the first protrusions 422 may be two, and the present application does not limit the number of the first protrusions 422 herein. In the embodiment of the present application, taking the number of the first protrusions 422 as two as an example. The two first protrusions 422 may be respectively located on both sides of the main coating layer 421, and the two first protrusions 422 may be connected to the main coating layer 421. Additionally, continue to refer to Figure 1 , the electrode assembly 200 may have a second surface 220. Among them, in a possible implementation manner, the number of the second surfaces 220 may be two, and the two second surfaces 220 are arranged opposite to each other. Exemplarily, the second surface 220 may be perpendicular to the first surface 210. It can be understood that the first protrusion 422 may be coated on the second surface 220, so that the second surface 220 of the electrode assembly 200 is in contact with the first protrusion 422.

[0058] Continue to refer to Figure 1 and Figure 2 , based on the above embodiments, in a possible implementation manner, the corresponding first protrusions 422 in the two second coating layers 420 may overlap on the second surface 220 of the electrode assembly 200. It can be understood that the corresponding first protrusions 422 in the two second coating layers 420 overlap on the second surface 220 of the electrode assembly 200 until they come into contact with each other, so that the two first protrusions 422 overlap on the second surface 220. Among them, the overlapping parts of the corresponding first protrusions 422 in the two second coating layers 420 can be connected by means such as gluing. Of course, in some other embodiments, the corresponding first protrusions 422 in the two second coating layers 420 can also be spliced and connected on the second surface 220 of the electrode assembly 200. It can be understood that the corresponding first protrusions 422 in the two second coating layers 420 overlap on the second surface 220 of the electrode assembly 200 until they come into contact with each other, so that the two first protrusions 422 are spliced and connected on the second surface 220. Among them, the splicing parts of the corresponding first protrusions 422 in the two second coating layers 420 can be connected by means such as gluing.

[0059] Continue to refer to Figure 2 , based on the above embodiments, further, each second coating layer 420 may further include a second protrusion 423, where the second protrusion 423 may be located at an end of the main coating layer 421 away from the first coating layer 410, and the second protrusion 423 may also be connected to the main coating layer 421. It can be understood that the second protrusion 423 can cover an end surface of the electrode assembly 200 facing away from the tab assembly 300, so that the end surface of the electrode assembly 200 facing away from the tab assembly 300 is in contact with the second protrusion 423.

[0060] Continue to refer to Figure 1 and Figure 2, based on the above embodiment, in one possible implementation, the corresponding second protrusions 423 in the two second coating layers 420 can overlap on the end surface of the electrode assembly 200 facing away from the tab assembly 300. It can be understood that the corresponding second protrusions 423 in the two second coating layers 420 are in contact with each other in the process of coating the end surface of the electrode assembly 200 facing away from the tab assembly 300, so that the two second protrusions 423 overlap on the end surface of the electrode assembly 200 facing away from the tab assembly 300. Among them, the overlapping parts of the corresponding second protrusions 423 in the two second coating layers 420 can be connected by gluing or the like. Of course, in some other embodiments, the corresponding second protrusions 423 in the two second coating layers 420 can also be spliced ​​and connected on the end surface of the electrode assembly 200 facing away from the tab assembly 300. It can be understood that the corresponding second protrusions 423 in the two second coating layers 420 contact each other in the process of coating the end surface of the electrode assembly 200 facing away from the tab assembly 300, so that the two second protrusions 423 are spliced ​​and connected on the end surface of the electrode assembly 200 facing away from the tab assembly 300. The splicing of the corresponding second protrusions 423 in the two second coating layers 420 can be connected by gluing or other methods.

[0061] Continue to refer Figure 1 On the basis of the above embodiment, the tab assembly 300 may further include a first tab 310 and a second tab 320. The first tab 310 and the second tab 320 may respectively correspond to the through opening 411 on the first coating layer 410, so that the first tab 310 and the second tab 320 can be exposed through the through opening 411.

[0062] refer to Figure 3 On the basis of the above embodiment, the single cell 100 may further include: an adapter assembly 500. The adapter assembly 500 may be connected to the pole lug assembly 300 through a through hole. In a possible implementation, the adapter assembly 500 may further include a first adapter 510 and a second adapter 520. It can be understood that the first adapter 510 may be connected to the first pole lug 310, and the second adapter 520 may be connected to the second pole lug 320. The first adapter 510 may be connected to the first pole lug 310 by welding or other methods, and the second adapter 520 may also be connected to the second pole lug 320 by welding or other methods.

[0063] refer to Figure 4, on the basis of the above embodiments, the single cell 100 may further include: a housing 600. Among them, in a possible implementation manner, the housing 600 may further include a housing body 610 and a bottom support member 620. It can be understood that the housing body 610 may be located on the outer peripheral side of the electrode assembly 200, and the insulating member 400 may be located between the housing body 610 and the electrode assembly 200. Among them, in a possible implementation manner, 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 body 610.

[0064] Continue to refer to Figure 4 , on the basis of the above embodiments, the bottom support member 620 may be located below the second protrusion 423, and the bottom support member 620 can be used to support the electrode assembly 200. In this way, both the housing body 610 and the bottom support member 620 have a certain protective effect, and by providing the housing body 610 and the bottom support member 620, the safety performance of the single cell 100 can be improved.

[0065] The second aspect of the embodiments of the present application provides a battery (not shown in the figure), and the battery may include at least one of the above single cells 100. In some embodiments of the present application, the battery may include a battery module formed by a group of several stacked single cells 100, or the battery may also directly form a battery pack by a group of several stacked single cells 100. It can be understood that the battery can be applied to battery systems in fields such as energy storage, battery swapping, and power.

[0066] In the embodiments of the present application, on the basis of 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, it is possible to prevent the situation where the connection between the tab assembly 300 and the electrode assembly 200 is not smooth, simplify the installation process, and improve the insulation performance inside the battery cell.

[0067] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0068] It should be noted that phrases such as "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily", etc. 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. Moreover, when combining a specific feature, structure or characteristic with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0069] Generally speaking, terms should be understood at least in part by their use in 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 singularity, or can be used to describe a combination of features, structures or characteristics in the sense of plurality. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood to convey singular usage or plural usage.

[0070] It should be easily understood that the terms "on", "above", and "over" in this 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 can also include the meaning of "above" or "over something" without intermediate features or layers therebetween (i.e., directly on something).

[0071] In addition, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", etc. may be used in the text to describe the relationship of one element or feature relative to other elements or features as shown in the figure. Spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used in the text can be interpreted accordingly.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended 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: Electrode assembly; A tab assembly, the tab assembly being located at one end of the electrode assembly; An insulating member is sleeved on the electrode assembly from one end of the electrode assembly where the pole lug assembly is provided and fits with the outer surface of the electrode assembly. The insulating member has a through hole at a position corresponding to the pole lug assembly to expose the pole lug assembly.

2. The single cell according to claim 1, characterized in that: The insulating member comprises a first coating layer and two second coating layers connected to the first coating layer; The two second coating layers are respectively located on both sides of the first coating layer; The first coating layer is sleeved on an end surface of the electrode assembly provided with the tab assembly, and the through opening is opened in the first coating layer; The second coating layer is coated on the remaining outer surface of the electrode assembly.

3. The single cell according to claim 2, characterized in that: Each of said second covering layers comprises a primary covering layer; One end of the main coating layer is connected to the first coating layer; The electrode assembly has two opposite first surfaces, and the main coating layer is coated on the first surfaces.

4. The single cell according to claim 3, characterized in that: Each of the second covering layers further comprises two first protrusions, and the two first protrusions are respectively located on two sides of the main covering layer; The electrode assembly has two opposite second surfaces, the second surfaces are perpendicular to the first surface, and the first protrusion is covered on the second surfaces.

5. The single cell according to claim 4, characterized in that: The corresponding first protrusions in the two second covering layers overlap on the second surface of the electrode assembly.

6. The single cell according to claim 3, characterized in that: Each of the second covering layers further comprises a second protrusion, wherein the second protrusion is located at an end of the main covering layer away from the first covering layer; The second protrusion is coated on an end surface of the electrode assembly facing away from the tab assembly.

7. The single cell according to claim 6, characterized in that: The corresponding second protrusions in the two second coating layers overlap on an end surface of the electrode assembly facing away from the tab assembly.

8. The single cell according to any one of claims 1 to 7, characterized in that: The single cell battery further includes: a switching assembly; The adapter assembly is connected to the tab assembly through the through opening.

9. The single cell according to claim 6, characterized in that: The single cell battery further comprises: a housing; The housing includes a shell and a bottom support; The shell is located at the outer peripheral side of the electrode assembly, and the insulating member is located between the shell and the electrode assembly; The bottom support member is located under the second protrusion, and the bottom support member is used to support 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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