Cover plate assembly and battery

Abstract

The application relates to the technical field of batteries, and provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate body, an outer pole post and an inner pole post arranged on the cover plate body, and the outer pole post is arranged through the cover plate body along the thickness direction of the cover plate body, and the inner pole post is arranged through the outer pole post; the inner pole post has an abutting portion extending to the outside of the cover plate body and a tab connecting portion extending to the inside of the cover plate body, and the abutting portion is used for abutting against an external cold source. The cover plate assembly disclosed by the application can make the inner pole post directly exchange heat with the external refrigerant, quickly take away the heat generated in the tab and pole post area during the fast charging process, reduce the interference of the heat generated by the tab on the heat management, and thus facilitate the improvement of the comprehensive performance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cover plate assembly and a battery. Background Technology

[0002] In related technologies, as the fast-charging capability of power batteries improves, the charging current of power batteries is becoming increasingly higher, and the heat generation during the charging process will increase significantly, placing higher demands on thermal management. However, with the current improvement in the fast-charging performance of power batteries, the heat generation at locations such as the tabs, terminals, and their welding areas increases under high-rate charging conditions. Conventional power batteries typically rely on the casing for heat dissipation, and the heat generated at the tabs and terminals is difficult to dissipate quickly, easily leading to a large temperature difference between different areas of the battery. This complicates the temperature control strategy of the thermal management system and is detrimental to the improvement of the overall battery performance. Utility Model Content

[0003] In view of this, this application aims to provide a cover assembly that is beneficial to improving the overall performance of the battery.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly includes a cover plate body, and an outer pole and an inner pole disposed on the cover plate body, wherein the outer pole penetrates the cover plate body along the thickness direction of the cover plate body, and the inner pole is disposed through the outer pole. The inner pole has an abutting part extending outward from the outer side of the cover plate body, and an electrode tab connecting part extending outward from the inner side of the cover plate body. The abutting part is used to abut against an external cold source, and the electrode tab connecting part is used to connect with the electrode tab of the electrode assembly.

[0005] Furthermore, the abutting portion and / or the connecting portion extend along the thickness direction of the cover plate body.

[0006] Furthermore, the outer electrode post is provided with a through hole along the thickness direction of the cover plate body, and the inner electrode post is inserted into the through hole from one end of the abutment part.

[0007] Furthermore, the outer pole includes a first main body penetrating the cover plate body, and a first connecting portion and a second connecting portion disposed on the first main body; along the thickness direction of the cover plate body, the first connecting portion is located on the outer side of the cover plate body, the second connecting portion is located on the inner side of the cover plate body, and the through hole sequentially penetrates the first connecting portion, the first main body, and the second connecting portion.

[0008] Furthermore, it also includes an outer insulating component and an inner insulating component, at least a portion of the outer insulating component being located between the first connecting portion, the first body and the cover plate body, and at least a portion of the inner insulating component being located between the second connecting portion and the cover plate body; and / or, a first sealing ring is provided between the second connecting portion, the first body and the cover plate body.

[0009] Furthermore, the inner pole post includes a second body having the abutting portion, a limiting portion disposed at one end of the second body away from the abutting portion, and a tab connecting portion disposed on the limiting portion. The second body is located in the through hole, and the limiting portion and the second connecting portion are connected.

[0010] Furthermore, a second sealing ring is provided between the limiting part and the second connecting part.

[0011] Furthermore, the second connecting portion has a groove on the side facing the limiting portion; the second sealing ring is disposed in the groove, and / or, the second connecting portion has a guide portion, the guide portion being located between the groove and the through hole.

[0012] Furthermore, the insertion end of the abutment portion is chamfered.

[0013] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application is provided by an outer electrode post penetrating through the cover plate body and an inner electrode post penetrating through the outer electrode post. The inner electrode post has a contact part for contacting an external cold source and an electrode tab connection part for connecting with the electrode tab of the electrode group. This can form an extended inner electrode post design, which allows the inner electrode post to directly exchange heat with the external refrigerant, quickly remove the heat generated in the electrode tab and electrode post area during fast charging, reduce the interference of electrode tab heat generation on thermal management, so as to achieve battery temperature balance and thus improve the overall performance of the battery.

[0014] (2) Both the contact part and the connecting part extend along the thickness direction of the cover plate body. This not only makes the structure simple and easy to arrange, but also allows the tab to be directly connected to the connecting part without bending, so as to realize the connection between the tab and the inner pole. This reduces the length of the tab and reduces defects caused by tab wrinkles, folds and cover plate rebound, thus improving the process yield.

[0015] (3) Inserting the inner pole into the through hole from one end of the contact part can improve the ease of assembly and make the inner pole and outer pole have good electrical connection reliability.

[0016] (4) The outer pole includes a first body, a first connecting part and a second connecting part, which not only has a simple structure, but also facilitates the installation stability of the outer pole on the cover plate body by limiting the first connecting part and the second connecting part.

[0017] (5) By setting the first sealing ring, the sealing between the outer electrode post and the cover plate body can be improved, and electrolyte leakage and exchange of air and moisture inside and outside the battery can be avoided.

[0018] (6) The inner pole includes a second body, a limiting part and a pole ear connection part, which makes the structure simple and facilitates the arrangement and reliable installation of the inner pole.

[0019] (7) By providing a second sealing ring between the limiting part and the second connecting part, the sealing between the inner pole and the outer pole can be ensured.

[0020] (8) The groove can facilitate the assembly of the second sealing ring and improve the space utilization of the cover plate assembly in the thickness direction of the cover plate body. At the same time, the second connecting part is provided with a guide part, which can facilitate the installation of the inner pole.

[0021] (9) The insertion end of the contact part is chamfered to avoid scratches when passing through the outer pole.

[0022] This application also proposes a battery including the cover assembly described above.

[0023] The battery described in this application has the aforementioned cover assembly, which has the same beneficial effects as conventional technology, and will not be described in detail here. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the cover plate assembly described in the embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective; Figure 3 This is an exploded view of the cover plate assembly described in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the cover plate assembly and the electrode tab as described in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the external pole as described in the embodiments of this application; Figure 6 This is a schematic diagram of the internal pole structure described in the embodiments of this application; Figure 7 The external insulating component described in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of a conventional battery with its tabs bent into a "C" shape, as described in the embodiments of this application. Figure 9 This is a schematic diagram of the structure of a conventional battery with its tabs bent into an "S" shape, as described in the embodiments of this application. Explanation of reference numerals in the attached figures: 100. Cover plate body; 200, external pole; 201. First main body; 202. First connecting part; 203. Second connecting part; 2031. Groove; 2032. Guide part; 204. Through hole; 300, inner pole; 301. Second body; 301a. Contact part; 302. Limiting part; 303. Electrode connecting part; 400. External insulation component; 401. Part 1; 402. Part 2; 500, Inner insulation component; 600, First sealing ring; 700, Second sealing ring; 800, Electrode assembly; 801, Electrode tab. Detailed Implementation

[0025] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0031] An embodiment of the first aspect of this application provides a cover assembly that facilitates temperature balance in various regions of the battery, thereby improving the overall performance of the battery.

[0032] In related technologies, with the improvement of fast charging capabilities of power batteries, the charging current of power batteries is getting higher and higher, and the heat generation during the charging process will increase significantly, placing higher demands on thermal management. However, after the current power battery fast charging performance has improved, the heat generation at locations such as the tab 801, the terminal post, and the welding area between the two increases under high-rate charging conditions. Conventional power batteries usually rely on the casing for heat dissipation, and the heat generated at the tab 801 and terminal post is difficult to dissipate quickly, which can easily lead to a large temperature difference between different areas of the battery. This causes problems for the temperature control strategy of the thermal management system and is not conducive to improving the overall performance of the battery.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 7 As shown, the overall design includes a cover plate body 100, and an outer pole post 200 and an inner pole post 300 disposed on the cover plate body 100.

[0034] In this configuration, an outer electrode post 200 is disposed through the cover plate body 100 along its thickness direction, and an inner electrode post 300 is disposed through the outer electrode post 200. Furthermore, the inner electrode post 300 has an abutment portion 301a extending outward from the cover plate body 100, and an electrode tab connecting portion 303 extending inward from the cover plate body 100. The abutment portion 301a is used to abut against an external cold source, and the electrode tab connecting portion 303 is used to connect with the electrode tab 801 of the electrode assembly 800.

[0035] Therefore, by having the outer electrode post 200 penetrate through the cover plate body 100 and the inner electrode post 300 penetrate through the outer electrode post 200, and the inner electrode post 300 having a contact portion 301a for contacting an external cold source and an electrode connecting portion 303 for connecting to the electrode tab 801 of the electrode assembly 800, an extended inner electrode post 300 design can be formed. This allows the inner electrode post 300 to directly exchange heat with the external refrigerant, quickly removing the heat generated by the electrode tab 801 and the electrode post area during fast charging, reducing the interference of the heat generated by the electrode tab 801 on thermal management, so as to achieve temperature balance in various areas of the battery, thereby improving the overall performance of the battery.

[0036] Based on the above overview, specifically, temperature control capability is one of the key indicators for evaluating the core design level of a battery. If the battery temperature difference is too large, it will not only disrupt the electrochemical balance, leading to capacity and power degradation, accelerating internal aging, and significantly shortening battery life, but it will also trigger local thermal runaway, directly causing safety risks.

[0037] Therefore, the heat dissipation performance of the tab 801 and the terminal post affects the temperature difference in various areas of the battery and is closely related to the improvement of the overall battery performance. This application improves the heat dissipation effect of the tab 801 and the terminal post by using the contact portion 301a of the inner terminal post 300 to contact an external cold source.

[0038] In some exemplary embodiments, the cover assembly of this embodiment is applicable to batteries with housings, which can be housings with single-sided tabs 801 or housings with double-sided tabs 801. The cover assembly of this embodiment is particularly applicable to prismatic batteries, which include, for example, a prismatic housing and an electrode assembly 800 disposed within the prismatic housing. The cover assembly is disposed on the prismatic housing and covers the electrode assembly 800 within the housing. The inner electrode post 300 in the cover assembly is connected to the tabs 801 of the electrode assembly 800.

[0039] In some exemplary embodiments, the external cold source of this embodiment can be either a separately provided cold plate for cooling the battery or a cold plate inside the battery pack. The abutment portion 301a can directly abut against the cold plate or be connected through a heat-conducting component. For example, if the battery with the cover assembly is a single cell that makes up the battery module in the battery pack, then the abutment portion 301a in the cover assembly can directly abut against the cold plate of the battery pack.

[0040] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment will vary depending on the orientation of the cover plate assembly; that is, the directions in this embodiment refer to a relative coordinate system based on the cover plate assembly.

[0041] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, both the abutment portion 301a and the connecting portion extend along the thickness direction of the cover plate body 100. This arrangement not only simplifies the structure and facilitates arrangement, but also allows the tab 801 to be directly connected to the connecting portion without bending, thereby achieving the connection between the tab 801 and the inner pole 300. This reduces the length of the tab 801 and minimizes defects caused by wrinkles, folds, and cover plate rebound, thus improving process yield.

[0042] It should be mentioned that in the current power battery production process, due to structural design limitations, the electrode assembly 800 is usually connected to the terminal post of the cover plate by bending the tab 801, for example... Figure 8 The middle electrode 801 is bent into a "C" shape and connected to the inner electrode post 300, or Figure 9 The middle electrode 801 is bent into an "S" shape and connected to the inner electrode post 300.

[0043] With the increase in electrode layers due to improved fast charging capabilities, the total thickness of the 801 electrode tab is becoming increasingly thick. This increases resistance during bending, making the cover plate prone to popping out during assembly, leading to rework or battery damage. It also increases the requirements for bending space, affecting the utilization rate of the battery's internal space. Furthermore, the heat generated during welding increases significantly, easily causing the plastic under the cover plate to melt and deform.

[0044] Furthermore, the bending design of the tab 801 places high demands on its length. For thick electrode groups 800, an increased tab 801 length can easily lead to wrinkles during electrode coating and rolling processes, causing issues such as tape breakage and tab 801 folding, thus affecting process yield. In this application, the connecting portion extends along the thickness direction of the cover plate body 100, eliminating the need for tab 801 bending and allowing it to connect directly to the inner electrode post 300, effectively solving the aforementioned problems.

[0045] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, the outer electrode 200 has a through hole 204 along the thickness direction of the cover plate body 100, and the inner electrode 300 is inserted into the through hole 204 from one end of the abutment portion 301a. The main advantage of this arrangement is that it can improve the ease of assembly and facilitate good electrical connection reliability between the inner electrode 300 and the outer electrode 200.

[0046] Continue to combine Figure 5 As shown, in some exemplary embodiments, the outer pole post 200 includes a first body 201 penetrating the cover plate body 100, and a first connecting portion 202 and a second connecting portion 203 disposed on the first body 201.

[0047] Furthermore, along the thickness direction of the cover plate body 100, the first connecting part 202 is located on the outer side of the cover plate body 100, the second connecting part 203 is located on the inner side of the cover plate body 100, and the through hole 204 passes through the first connecting part 202, the first body 201, and the second connecting part 203 in sequence.

[0048] It is understandable that making the outer pole post 200 include a first body 201, a first connecting part 202 and a second connecting part 203 not only simplifies the structure, but also helps to improve the installation stability of the outer pole post 200 on the cover plate body 100 by limiting the first connecting part 202 and the second connecting part 203.

[0049] In practice, it will still be as follows Figure 5 As shown, along the thickness direction of the cover plate body 100, the cross-sections of the first body 201, the first connecting part 202, and the second connecting part 203 in this embodiment are all elongated and semi-circular at both ends. Furthermore, along the thickness direction of the cover plate body 100, the cross-sectional profiles of the first connecting part 202 and the second connecting part 203 are larger than the cross-sectional profile of the first body 201, which makes the outer pole post 200 have better installation stability.

[0050] Continue to combine Figure 3 , Figure 4 and Figure 7 As shown, in some exemplary embodiments, the cover plate assembly of this embodiment further includes an outer insulating member 400 and an inner insulating member 500, at least a portion of the outer insulating member 400 is located between the first connecting portion 202, the first body 201 and the cover plate body 100, and at least a portion of the inner insulating member 500 is located between the second connecting portion 203 and the cover plate body 100.

[0051] Specifically, still as Figure 7 As shown, the outer insulating member 400 includes a first portion 401 sandwiched between the cover plate body 100 and the first connecting portion 202, and a second portion 402 sandwiched between the cover plate body 100 and the first body 201. If necessary, the outer side of the first portion 401 is also provided with a mounting groove for the first connecting portion 202 to be inserted. The aforementioned outer insulating member 400 can be an upper plastic material well known to those skilled in the art, and the inner insulating member 500 can be a lower plastic material well known to those skilled in the art.

[0052] Meanwhile, in some exemplary embodiments, a first sealing ring 600 is provided between the second connecting part 203, the first main body 201 and the cover plate main body 100, thereby improving the sealing between the outer electrode post 200 and the cover plate main body 100 and preventing electrolyte leakage and the exchange of air, moisture and other substances inside and outside the battery.

[0053] In addition, continue to combine Figures 4 to 6 As shown, in some exemplary embodiments, the inner electrode post 300 includes a second body 301 with an abutment portion 301a, a limiting portion 302 located at the end of the second body 301 away from the abutment portion 301a, and an electrode tab connecting portion 303 located on the limiting portion 302. The second body 301 is located in the through hole 204, and the limiting portion 302 is connected to the second connecting portion 203. This arrangement simplifies the structure and facilitates the arrangement and reliable installation of the inner electrode post 300.

[0054] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, a second sealing ring 700 is provided between the limiting part 302 and the second connecting part 203 to ensure the sealing between the inner pole post 300 and the outer pole post 200.

[0055] In addition, continue to combine Figures 3 to 5 As shown, in some exemplary embodiments, the second connecting portion 203 has a groove 2031 on the side facing the limiting portion 302, and the second sealing ring 700 is disposed in the groove 2031. The groove 2031 facilitates the assembly of the second sealing ring 700 and improves the space utilization of the cover plate assembly in the thickness direction of the cover plate body 100.

[0056] Furthermore, in some exemplary embodiments, the second connecting portion 203 is provided with a guide portion 2032, which is located between the groove 2031 and the through hole 204, and specifically, the guide portion 2032 is a guide slope located between the groove 2031 and the through hole 204. The provision of the guide portion 2032 here can facilitate the installation of the inner pole post 300.

[0057] In addition, continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the insertion end of the abutment 301a is chamfered to prevent scratches when passing through the outer pole 200.

[0058] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 7 As shown, it may include, for example, a cover plate body 100, and an outer pole post 200 and an inner pole post 300 disposed on the cover plate body 100.

[0059] In this configuration, along the thickness direction of the cover plate body 100, the outer electrode post 200 is disposed through the cover plate body 100, and the inner electrode post 300 is disposed through the outer electrode post 200. Furthermore, the inner electrode post 300 has an abutting portion 301a extending outward from the cover plate body 100, and an electrode tab connecting portion 303 extending outward from the cover plate body 100. The abutting portion 301a is used to abut against an external cold source, and the electrode tab connecting portion 303 is used to connect with the electrode tab 801 of the electrode group 800.

[0060] Both the abutting part 301a and the connecting part extend along the thickness direction of the cover plate body 100.

[0061] The outer electrode post 200 is provided with a through hole 204 along the thickness direction of the cover plate body 100, and the inner electrode post 300 is inserted into the through hole 204 from one end of the abutment part 301a.

[0062] The outer pole post 200 includes a first main body 201 that penetrates the cover plate body 100, and a first connecting part 202 and a second connecting part 203 disposed on the first main body 201; and along the thickness direction of the cover plate body 100, the first connecting part 202 is located on the outer side of the cover plate body 100, the second connecting part 203 is located on the inner side of the cover plate body 100, and the through hole 204 passes through the first connecting part 202, the first main body 201 and the second connecting part 203 in sequence.

[0063] The device also includes an inner insulating component 500 and an outer insulating component 400. At least a portion of the inner insulating component 500 and the outer insulating component 400 is located between the first connecting portion 202, the first main body 201 and the cover plate main body 100, and at least a portion of the inner insulating component 500 is located between the second connecting portion 203 and the cover plate main body 100. Meanwhile, a first sealing ring 600 is provided between the second connecting portion 203, the first main body 201 and the cover plate main body 100.

[0064] The inner pole post 300 includes a second body 301 with an abutment portion 301a, a limiting portion 302 located at the end of the second body 301 away from the abutment portion 301a, and a pole tab connecting portion 303 located on the limiting portion 302. The second body 301 is located in the through hole 204, and the limiting portion 302 and the second connecting portion 203 are connected.

[0065] A second sealing ring 700 is provided between the limiting part 302 and the second connecting part 203.

[0066] The second connecting part 203 has a groove 2031 on the side facing the limiting part 302, the second sealing ring 700 is disposed in the groove 2031, and the second connecting part 203 has a guide part 2032, which is located between the groove 2031 and the through hole 204.

[0067] The insertion end of the contact portion 301a is chamfered.

[0068] In the preferred embodiment of the above cover plate assembly, the specific configuration and arrangement of the cover plate body 100, outer pole post 200, inner pole post 300, outer insulating component 400, inner insulating component 500, first sealing ring 600, second sealing ring 700, pole group 800, and pole tab 801 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate body 100, outer pole post 200, inner pole post 300, outer insulating component 400, inner insulating component 500, first sealing ring 600, second sealing ring 700, pole group 800, and pole tab 801 can also be referred to the descriptions in the above exemplary embodiments.

[0069] The cover plate assembly of this embodiment adopts the above design. The outer electrode post 200 is set through the cover plate body 100, and the inner electrode post 300 is set through the outer electrode post 200. The inner electrode post 300 has a contact part 301a for contacting an external cold source, and an electrode connecting part 303 for connecting with the electrode tab 801 of the electrode group 800. This can form an extended inner electrode post 300 design, so that the inner electrode post 300 can directly exchange heat with the external refrigerant, quickly remove the heat generated by the electrode tab 801 and the electrode post area during fast charging, reduce the interference of the heat generated by the electrode tab 801 on thermal management, so as to achieve temperature balance in various areas of the battery, thereby improving the overall performance of the battery.

[0070] An embodiment of the second aspect of this application provides a battery including the cover assembly as described above. Specifically, the battery of this embodiment further includes a housing, an electrode assembly 800 disposed within the housing, and the cover assembly described in the first aspect embodiment disposed on the housing. The cover assembly encloses the electrode assembly 800 within the housing, and the inner electrode post 300 in the cover assembly is connected to the electrode tab 801 of the electrode assembly 800.

[0071] In this embodiment, by providing the cover plate assembly as in the first aspect embodiment, the overall temperature uniformity of the battery can be improved, thereby enhancing the overall performance of the battery.

[0072] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate assembly, characterized in that: It includes a cover plate body, and an outer pole and an inner pole disposed on the cover plate body, wherein the outer pole penetrates the cover plate body along the thickness direction of the cover plate body, and the inner pole is disposed on the outer pole. The inner pole has an abutting part extending outward from the outer side of the cover plate body, and an electrode tab connecting part extending outward from the inner side of the cover plate body. The abutting part is used to abut against an external cold source, and the electrode tab connecting part is used to connect with the electrode tab of the electrode assembly.

2. The cover plate assembly according to claim 1, characterized in that: The abutting portion and / or the connecting portion extend along the thickness direction of the cover plate body.

3. The cover plate assembly according to claim 1, characterized in that: The outer electrode post is provided with a through hole along the thickness direction of the cover plate body, and the inner electrode post is inserted into the through hole from one end of the abutment part.

4. The cover plate assembly according to claim 3, characterized in that: The outer pole post includes a first main body that penetrates the cover plate body, and a first connecting part and a second connecting part disposed on the first main body; Along the thickness direction of the cover plate body, the first connecting part is located on the outer side of the cover plate body, the second connecting part is located on the inner side of the cover plate body, and the through hole passes through the first connecting part, the first body and the second connecting part in sequence.

5. The cover plate assembly according to claim 4, characterized in that: It also includes an outer insulating component and an inner insulating component, at least a portion of the outer insulating component being located between the first connecting portion, the first body, and the cover plate body, and at least a portion of the inner insulating component being located between the second connecting portion and the cover plate body; and / or, A first sealing ring is provided between the second connecting part, the first main body and the cover plate main body.

6. The cover plate assembly according to claim 4, characterized in that: The inner pole post includes a second body having the abutting portion, a limiting portion located at one end of the second body away from the abutting portion, and a tab connecting portion located on the limiting portion. The second body is located in the through hole, and the limiting portion and the second connecting portion are connected.

7. The cover plate assembly according to claim 6, characterized in that: A second sealing ring is provided between the limiting part and the second connecting part.

8. The cover plate assembly according to claim 7, characterized in that: The second connecting portion has a groove on the side facing the limiting portion; The second sealing ring is disposed in the groove, and / or the second connecting part is provided with a guide part, the guide part being located between the groove and the through hole.

9. The cover plate assembly according to any one of claims 3 to 8, characterized in that: The insertion end of the abutment part is chamfered.

10. A battery, characterized in that: The cover assembly includes any one of claims 1 to 9.

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