A top cover assembly and a battery cell

Abstract

The application provides a top cover assembly and a battery monomer. The top cover assembly comprises a base plate, a pole and a first insulating piece. The first insulating piece circumferentially covers the outer side of the pole. The base plate has a first mounting hole. The pole is mounted on the base plate through the first mounting hole. The side wall of the first mounting hole is circumferentially provided with a flange extending towards the inside of the first mounting hole. The first insulating piece covers the flange. In the thickness direction of the top cover assembly, the top surface of the first insulating piece and the top surface of the flange have a height difference H1, and H1 is greater than or equal to 0.4 mm, so that the top surface of the flange has sufficient first insulating piece structure. When the top surface of the pole is welded, the first insulating piece on the top surface of the flange is most affected by the welding heat. Therefore, when H1 is greater than or equal to 0.4 mm, the welding heat conducted to the first insulating piece can reduce the damage of the first insulating piece at this position, and the sealing and insulation effects of the first insulating piece can be ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a top cover assembly and a battery cell. Background Technology

[0002] With the rapid development of new energy technologies, batteries are being applied to more and more fields, and people's requirements for battery safety performance are also increasing. A battery cell includes a top cover assembly, which has positive and negative terminals and plastic parts fitted onto them. During the assembly of the battery module, the instantaneous temperature when welding the battery cell can reach 300℃-400℃. Heat is rapidly conducted through the terminals to the plastic parts, causing partial melting and deformation of the plastic parts, or even melting them completely. This prevents the plastic parts from effectively insulating and sealing the terminals, posing a risk of electrolyte leakage and affecting the safety of battery use. Utility Model Content

[0003] This application provides a top cover assembly and a battery cell to solve the technical problem in the prior art where welding heat affects the safety of battery cell use.

[0004] In a first aspect, embodiments of this application provide a top cover assembly, the top cover assembly including a substrate, an electrode post, and a first insulating member, the first insulating member circumferentially covering the outer side surface of the electrode post; the substrate has a first mounting hole, the electrode post being mounted on the substrate through the first mounting hole; the sidewall of the first mounting hole is circumferentially provided with a flange extending toward the interior of the first mounting hole; the first insulating member covers the flange; wherein, along the thickness direction of the top cover assembly, the top surface of the first insulating member and the top surface of the flange have a height difference H1, H1≥0.4mm.

[0005] In this embodiment, the top cover assembly is provided with a first insulating member, which circumferentially covers the outer surface of the electrode post to provide insulation. Simultaneously, the electrode post is mounted on the substrate through a first mounting hole. The sidewall of the first mounting hole is provided with a flange extending inwards towards the inside of the hole, increasing the contact area between the mounting hole and the electrode post and improving the reliability of the electrode post when mounted within the hole. The first insulating member can also cover the flange to provide a sealing function, effectively sealing the gap between the electrode post and the first mounting hole and reducing the risk of electrolyte leakage.

[0006] In addition, along the thickness direction of the top cover assembly, there is a height difference H1 between the top surface of the first insulating element and the top surface of the flange, and H1 is greater than or equal to 0.4 mm. This ensures that the top surface of the flange has sufficient first insulating element structure. When the top surface of the pole post is welded, the first insulating element on the top surface of the flange is most affected by the welding heat. Therefore, making H1 greater than or equal to 0.4 mm can reduce the possibility of the welding heat conducted to the first insulating element damaging the first insulating element at this location, thereby ensuring the sealing and insulation effect of the first insulating element.

[0007] In one specific embodiment, along the thickness direction of the top cover assembly, the top surface of the first insulating member and the top surface of the substrate have a height difference H2, where H2 ≥ 2 mm.

[0008] In one specific embodiment, along the thickness direction of the top cover assembly, the top surface of the pole protrudes relative to the top surface of the first insulating member; the top surface of the pole and the top surface of the first insulating member have a height difference H3, where H3 ≥ 0.5 mm.

[0009] In one specific embodiment, the first mounting hole includes a first segment and a second segment that are connected to each other. Along the direction toward the substrate, the cross-sectional area of ​​the first segment gradually increases, and the cross-sectional area of ​​the second segment is larger than that of the first segment.

[0010] In one specific embodiment, the top cover assembly further includes a support member installed within the second segment and sleeved onto the pole post.

[0011] In one specific embodiment, the top cover assembly is further provided with a sealing element, which is sleeved on the pole post; the support member is provided with a limiting part, and the sealing element is provided with a limiting mating part, which can cooperate with the limiting mating part.

[0012] In one specific embodiment, the first insulating element is injection molded.

[0013] In one specific embodiment, the top cover assembly further includes a second insulating member connected to one end of the substrate away from the first insulating member; the second insulating member has a second mounting hole, and a portion of the pole post is mounted in the second mounting hole.

[0014] In one specific embodiment, along the thickness direction of the top cover assembly, the bottom surface of the pole protrudes relative to the bottom surface of the second insulating member; the bottom surface of the pole and the bottom surface of the second insulating member have a height difference H4, where H4 ≥ 0.1 mm.

[0015] Secondly, embodiments of this application provide a battery cell, the battery cell comprising: a top cover assembly and a housing, the housing having an opening; wherein, the top cover assembly is used to seal the opening; the battery cell further comprises a cell assembly, the cell assembly being installed within the housing.

[0016] In this embodiment, the top cover assembly described in the previous embodiment is provided on the housing, which can seal the opening of the housing to form a cavity for accommodating the battery cell assembly, electrolyte, and other components. Furthermore, by providing the top cover assembly described in the previous embodiment, when welding multiple battery cells, even when the top surface of the terminal post is welded to the busbar, the welding heat conducted through the terminal post to the first insulating component can be reduced, thus reducing the risk of damage to the first insulating component. This ensures the insulation and sealing effect of the first insulating component, prevents electrolyte leakage from the housing, and improves the safety of the battery cells. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in this application in a specific embodiment;

[0019] Figure 2 for Figure 1 Exploded view of the top cover assembly in one specific embodiment;

[0020] Figure 3 for Figure 2 Cross-sectional view of the top cover assembly;

[0021] Figure 4 for Figure 3 A magnified view of part I in the middle;

[0022] Figure 5 for Figure 3 Cross-sectional view of the substrate;

[0023] Figure 6 for Figure 5 A magnified view of a section II;

[0024] Figure 7 for Figure 3 Cross-sectional view of the second insulating component;

[0025] Figure 8 for Figure 7 A magnified view of part III.

[0026] Figure label:

[0027] 1-Battery cell;

[0028] 11-Top cover assembly;

[0029] 111-Substrate;

[0030] 111a - First mounting hole;

[0031] 111b - Flange;

[0032] 111c - First paragraph;

[0033] 111d - Second paragraph;

[0034] 112-Pole Column;

[0035] 112a - Step section;

[0036] 113 - First insulating element;

[0037] 114 - Second insulating element;

[0038] 114a - Second mounting hole;

[0039] 114b - Boss;

[0040] 114c - Groove;

[0041] 115 - Support component;

[0042] 115a - Limiting part;

[0043] 116 - Seals;

[0044] 116a - Limiting and fitting part;

[0045] 12-Shell. Detailed Implementation

[0046] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0047] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0048] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0049] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0050] With the rapid development of new energy technologies, batteries are being applied to more and more fields, and people's requirements for battery safety performance are also increasing. Battery modules consist of multiple battery cells. When assembling these cells, the busbar and adjacent cells need to be welded. The instantaneous high temperature generated during welding can reach 300℃-400℃. This heat is quickly conducted through the terminals to the insulating plastic parts used to seal the upper part of the terminals. Because the melting point of insulating plastic parts is generally low, they are prone to melting and deformation, and even partial melting. This prevents the insulating plastic parts from effectively sealing the terminals, posing a risk of electrolyte leakage to the battery cells and affecting their safety.

[0051] To solve the above technical problems, such as Figures 1 to 4 As shown, this application embodiment provides a top cover assembly 11 and a battery cell 1 including the top cover assembly 11. The top cover assembly 11 may include a substrate 111, a terminal post 112, and a first insulating member 113. The first insulating member 113 circumferentially covers the outer side surface of the terminal post 112. The substrate 111 may have a first mounting hole 111a. The terminal post 112 is mounted on the substrate 111 through the first mounting hole 111a. A flange 111b extending toward the interior of the first mounting hole 111a is circumferentially provided on the sidewall of the first mounting hole 111a. The first insulating member 113 covers the flange 111b. Along the thickness direction of the top cover assembly 11, the top surface of the first insulating member 113 and the top surface of the flange 111b have a height difference H1, where H1 ≥ 0.4 mm.

[0052] In this embodiment, the top cover assembly 11 is provided with a first insulating member 113, which circumferentially covers the outer surface of the electrode post 112, thereby providing insulation to the outer surface of the electrode post 112. Simultaneously, the electrode post 112 is mounted on the substrate 111 through a first mounting hole 111a. The sidewall of the first mounting hole 111a is circumferentially provided with a flange 111b extending towards the interior of the first mounting hole 111a, increasing the corresponding contact area between the first mounting hole 111a and the electrode post 112, thus improving the reliability of the electrode post 112 when mounted within the first mounting hole 111a. The first insulating member 113 can also cover the flange 111b, providing a sealing function to seal the gap between the electrode post 112 and the first mounting hole 111a, reducing the risk of electrolyte leakage.

[0053] In addition, along the thickness direction of the top cover assembly 11, the top surface of the first insulating member 113 and the top surface of the flange 111b are made to have a height difference H1, and H1 is greater than or equal to 0.4 mm. This ensures that the top surface of the flange 111b has sufficient structure of the first insulating member 113. When the top surface of the pole post 112 is welded, the first insulating member 113 on the top surface of the flange 111b is most affected by the welding heat. Therefore, making H1 greater than or equal to 0.4 mm can reduce the possibility of the welding heat conducted to the first insulating member 113 damaging the first insulating member 113 at this location, thereby ensuring the sealing and insulation effect of the first insulating member 113.

[0054] The height difference H1 between the top surface of the first insulating member 113 and the top surface of the flange 111b can be 0.4mm, 0.5mm, 0.6mm, etc. In other embodiments, H1 can also be other values. The specific value of H1 is not limited in the embodiments of this application, and can be adaptively adjusted according to the actual use.

[0055] like Figure 1 and Figure 2 As shown, the battery cell 1 provided in this embodiment may include a top cover assembly 11 and a housing 12. The housing 12 may have an opening, wherein the top cover assembly 11 is used to seal the opening. The battery cell 1 also includes a cell assembly, which is installed inside the housing 12.

[0056] In this embodiment, the top cover assembly 11 described in the above embodiment is provided on the housing 12, which can seal the opening of the housing 12 to form a receiving cavity (not shown in the figure) for accommodating the battery cell assembly, electrolyte, and other components. Furthermore, by providing the top cover assembly 11 described in the above embodiment, when welding multiple battery cells 1, even when the top surface of the terminal post 112 is welded to the busbar, the welding heat conducted through the terminal post 112 to the first insulating component 113 can be reduced, thus reducing the damage to the first insulating component 113 and ensuring its insulation and sealing effect. This prevents electrolyte leakage inside the housing 12, thereby improving the safety of the battery cell 1 in use.

[0057] In the above embodiments, such as Figure 2 As shown, the substrate 111 and the pole piece 112 in the top cover assembly 11 can both be metal parts. When the pole piece 112 and the substrate 111 are connected, a short circuit will occur. Therefore, when the pole piece 112 is installed in the first mounting hole 111a, there needs to be a gap between the pole piece 112 and the first mounting hole 111a.

[0058] In this embodiment, the first insulating component 113 can be integrally injection molded, so that the first insulating component 113 can be filled into the gap between the terminal post 112 and the first mounting hole 111a by injection molding, thereby achieving insulation of the terminal post 112, avoiding short circuits in the battery cell 1 during use, and improving safety. Furthermore, by forming the first insulating component 113 by injection molding, the first insulating component 113 can automatically adapt to the complex structural shape between the terminal post 112 and the first mounting hole 111a, allowing the first insulating component 113 to cover the terminal post 112 and the flange 111b. This improves the insulation effect of the first insulating component 113, as well as the connection reliability between the first insulating component 113, the terminal post 112, and the first mounting hole 111a. Simultaneously, it also improves the sealing effect of the first insulating component 113 on the gap between the terminal post 112 and the first mounting hole 111a.

[0059] In other embodiments, the first insulating element 113 may also be prepared in other ways. The specific preparation method of the first insulating element 113 is not limited in the embodiments of this application, and can be adjusted according to the actual situation.

[0060] In one specific embodiment, such as Figure 2 As shown, the first insulating component 113 can be made of one or more composites of ceramics, mica, glass fiber, polyphenylene sulfide, liquid crystal polymer, and soluble polytetrafluoroethylene. The first insulating component 113 prepared using the above materials has the advantages of high melting point and low cost, ensuring that the melting point of the first insulating component 113 meets the requirement of ≥200℃, thereby reducing the impact of welding heat on the first insulating component 113.

[0061] In other embodiments, the first insulating element 113 may also be made of other materials. In this application embodiment, the specific material of the first insulating element 113 is not limited, and can be adapted according to the actual situation.

[0062] In one specific embodiment, such as Figure 2 and Figure 4 As shown, along the thickness direction of the top cover assembly 11, the top surface of the first insulating member 113 and the top surface of the substrate 111 may have a height difference H2, where H2 ≥ 2 mm.

[0063] In this embodiment, along the thickness direction of the top cover assembly 11, the height difference H2 between the top surface of the first insulating member 113 and the top surface of the substrate 111 satisfies H2≥2mm. This increases the overall thickness of the first insulating member 113, thereby improving its insulation and sealing effect. It also increases the creepage distance between the top surface of the terminal post 112 and the top surface of the substrate 111, preventing arc discharge from occurring on the surface of the first insulating member 113 during use, which could lead to a short circuit in the battery cell 1. This improves the safety of the battery cell 1 during use.

[0064] H2 can be 2mm, 3mm, 4mm, etc. In other embodiments, H2 can also be other values. The specific value of H2 is not limited in the embodiments of this application, and can be adjusted adaptively according to the actual situation.

[0065] In one specific embodiment, such as Figure 2 and Figure 4 As shown, along the thickness direction of the top cover assembly 11, the top surface of the pole post 112 can protrude relative to the top surface of the first insulating member 113. The top surface of the pole post 112 and the top surface of the first insulating member 113 have a height difference H3, where H3 ≥ 0.5 mm.

[0066] In this embodiment, along the thickness direction of the top cover assembly 11, the top surface of the terminal post 112 protrudes relative to the top surface of the first insulating member 113. When welding the top surface of the terminal post 112, due to the height difference between the top surface of the terminal post 112 and the top surface of the first insulating member 113, the welding heat transferred from the top surface of the terminal post 112 to the first insulating member 113 can be further reduced, thereby further reducing the damage caused by the welding heat to the first insulating member 113, ensuring the insulation and sealing effect of the first insulating member 113, avoiding short circuits or leakage in the battery cell 1, and thus improving the safety of the battery cell 1 during use.

[0067] H3 can be 0.5mm, 0.6mm, 0.7mm, etc. In other embodiments, H3 can also be other values. The specific value of H3 is not limited in the embodiments of this application, and can be adjusted adaptively according to the actual situation.

[0068] In one specific embodiment, such as Figure 2 , Figure 5 and Figure 6 As shown, the first mounting hole 111a includes a first segment 111c and a second segment 111d that are connected to each other. Along the direction toward the substrate 111, the cross-sectional area of ​​the first segment 111c gradually increases. And the cross-sectional area of ​​the second segment 111d is larger than the cross-sectional area of ​​the first segment 111c.

[0069] In this embodiment, the first mounting hole 111a has a first segment 111c and a second segment 111d that are connected. The first segment 111c is mainly used to accommodate the pole post 112 structure. The second segment 111d is located close to the housing and needs to accommodate sealing components such as sealing rings fitted onto the pole post 112 while also accommodating the pole post 112 structure. Therefore, the cross-sectional area of ​​the second segment 111d is larger than that of the first segment 111c to facilitate the arrangement of sealing components fitted onto the pole post 112. At the same time, the cross-sectional area of ​​the first segment 111c gradually increases along the direction toward the substrate 111 to improve the connection reliability between the first insulating member 113 and the first segment 111c, thereby further improving the sealing effect of the first insulating member 113.

[0070] In one specific embodiment, such as Figure 2 , Figure 4 and Figure 6 As shown, the top cover assembly 11 may also include a support member 115, which is installed in the second segment 111d and is sleeved on the pole post 112.

[0071] In this embodiment, the top cover assembly 11 may further include a support member 115, which is installed within the second segment 111d and can be sleeved onto the pole post 112 to further improve the connection reliability between the pole post 112 and the substrate 111. Simultaneously, along the thickness direction of the top cover assembly 11, the pole post 112 may have multiple regions with different cross-sectional areas. For example, the cross-sectional area of ​​the pole post 112 structure above the support member 115 may be larger than the cross-sectional area of ​​the pole post 112 structure within the corresponding region of the support member 115. That is, the pole post 112 has a stepped portion 112a, and the support member 115 can abut against the stepped portion 112a, thereby supporting the stepped portion 112a of the pole post 112 and further improving the installation stability of the pole post 112.

[0072] In one specific embodiment, such as Figure 2 and Figure 4As shown, the top cover assembly 11 may also be provided with a sealing element 116, which is sleeved on the pole post 112. The support member 115 is provided with a limiting part 115a, and the sealing element 116 is provided with a limiting mating part 116a, which can cooperate with the limiting mating part 116a.

[0073] In this embodiment, to improve the sealing performance of the top cover assembly 11 and prevent electrolyte leakage, the top cover assembly 11 may also be provided with a sealing element 116. The sealing element 116 can be sleeved on the electrode post 112 to further seal the gap between the electrode post 112 and the first mounting hole 111a. Specifically, along the thickness direction of the top cover assembly 11, the sealing element 116 can be disposed between the step portion 112a of the electrode post 112 and the support member 115, so that the step portion 112a and the support member 115 can clamp the sealing element 116, improving the tightness of the connection between the sealing element 116 and the electrode post 112, thereby improving the sealing effect of the sealing element 116. At the same time, the support member 115 may be provided with a limiting portion 115a, and the sealing element 116 may be provided with a limiting mating portion 116a. The limiting portion 115a can cooperate with the limiting mating portion 116a to prevent the sealing element 116 from shifting, thereby further fixing the sealing element 116 and ensuring the sealing effect of the sealing element 116.

[0074] In this embodiment, the limiting part 115a can be a protrusion and the limiting mating part 116a can be a recess. In other embodiments, the limiting part 115a can also be a recess and the limiting mating part 116a can also be a protrusion. The specific structure of the limiting part 115a and the limiting mating part 116a is not limited in this application embodiment.

[0075] In one specific embodiment, such as Figure 2 and Figure 4 As shown, the top cover assembly 11 may also include a second insulating member 114, which is connected to the end of the substrate 111 away from the first insulating member 113. The second insulating member 114 has a second mounting hole 114a, and a portion of the structure of the pole post 112 is installed in the second mounting hole 114a.

[0076] In this embodiment, the top cover assembly 11 may further include a second insulating member 114, which is connected to the end of the substrate 111 away from the first insulating member 113. This ensures the second insulating member 114 is located between the substrate 111 and the cell assembly, providing insulation, protection, and support for the substrate 111. Furthermore, a portion of the electrode post 112 is installed within the second mounting hole 114a of the second insulating member 114, allowing the electrode post 112 to connect with components within the housing.

[0077] In one specific embodiment, such as Figure 2 and Figure 4 As shown, along the thickness direction of the top cover assembly 11, the bottom surface of the pole post 112 protrudes relative to the bottom surface of the second insulating member 114. The bottom surface of the pole post 112 and the bottom surface of the second insulating member 114 have a height difference H4, where H4 ≥ 0.1 mm.

[0078] In this embodiment, the bottom surface of the pole post 112 protrudes relative to the bottom surface of the second insulating member 114, and the height difference H4 between the bottom surface of the pole post 112 and the bottom surface of the second insulating member 114 is ≥0.1mm. During the assembly of the top cover assembly 11 and the housing, when welding the bottom surface of the pole post 112 to components such as the tabs inside the housing (not shown in the figure), the welding heat conducted through the pole post 112 to the second insulating member 114 can be reduced, thereby reducing the possibility of the welding heat conducted to the second insulating member 114 damaging the second insulating member 114, and thus ensuring the insulation and support functions of the second insulating member 114.

[0079] H4 can be 0.1mm, 0.2mm, 0.3mm, etc. In other embodiments, H4 can also be other values. The specific value of H4 is not limited in the embodiments of this application, and can be adjusted adaptively according to the actual situation.

[0080] In the above embodiments, such as Figure 4 , Figure 7 and Figure 8 As shown, the second insulating member 114 is also provided with a boss 114b extending toward the sealing member 116. The boss 114b abuts against the bottom surface of the sealing member 116, thereby further compressing the sealing member 116 to improve the installation tightness of the sealing member 116, and further improve the sealing effect of the sealing member 116.

[0081] In the above embodiments, such as Figure 4 , Figure 7 and Figure 8 As described above, along the thickness direction of the top cover assembly 11, the corresponding areas of the second insulating member 114 and the support member 115 are also provided with grooves 114c, so that when a part of the structure of the support member 115 is installed in the groove 114c, there is a gap between the top surface of the part of the support member 115 structure and the substrate 111, thereby avoiding the occurrence of solder mark protrusions when the support member 115 is subsequently welded to the substrate 111.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A top cover assembly, characterized in that, The top cover assembly (11) includes a substrate (111), an electrode post (112), and a first insulating member (113), wherein the first insulating member (113) circumferentially covers the outer side of the electrode post (112); The substrate (111) has a first mounting hole (111a), and the pole post (112) is mounted on the substrate (111) through the first mounting hole (111a); a flange (111b) extending toward the interior of the first mounting hole (111a) is provided circumferentially on the side wall of the first mounting hole (111a); the first insulating member (113) covers the flange (111b). Along the thickness direction of the top cover assembly (11), the top surface of the first insulating member (113) and the top surface of the flange (111b) have a height difference H1, where H1 ≥ 0.4 mm.

2. The top cover assembly according to claim 1, characterized in that, Along the thickness direction of the top cover assembly (11), the top surface of the first insulating member (113) and the top surface of the substrate (111) have a height difference H2, H2≥2mm.

3. The top cover assembly according to claim 1, characterized in that, Along the thickness direction of the top cover assembly (11), the top surface of the pole post (112) protrudes relative to the top surface of the first insulating member (113); The top surface of the pole (112) and the top surface of the first insulating member (113) have a height difference H3, where H3 ≥ 0.5 mm.

4. The top cover assembly according to claim 1, characterized in that, The first mounting hole (111a) includes a first segment (111c) and a second segment (111d) that are connected to each other. Along the direction toward the substrate (111), the cross-sectional area of ​​the first segment (111c) gradually increases; the cross-sectional area of ​​the second segment (111d) is greater than the cross-sectional area of ​​the first segment (111c).

5. The top cover assembly according to claim 4, characterized in that, The top cover assembly (11) also includes a support member (115), which is installed in the second section (111d) and is sleeved on the pole post (112).

6. The top cover assembly according to claim 5, characterized in that, The top cover assembly (11) is also provided with a sealing element (116), which is sleeved on the pole post (112); The support member (115) is provided with a limiting part (115a), and the sealing member (116) is provided with a limiting mating part (116a). The limiting part (115a) can cooperate with the limiting mating part (116a).

7. The top cover assembly according to any one of claims 1-6, characterized in that, The first insulating component (113) is injection molded.

8. The top cover assembly according to any one of claims 1-6, characterized in that, The top cover assembly (11) further includes a second insulating member (114), which is connected to one end of the substrate (111) away from the first insulating member (113); The second insulating member (114) has a second mounting hole (114a), and a portion of the structure of the pole (112) is installed in the second mounting hole (114a).

9. The top cover assembly according to claim 8, characterized in that, Along the thickness direction of the top cover assembly (11), the bottom surface of the pole post (112) protrudes relative to the bottom surface of the second insulating member (114); The bottom surface of the pole post (112) and the bottom surface of the second insulating member (114) have a height difference H4, where H4 ≥ 0.1 mm.

10. A single battery cell, characterized in that, The battery cell (1) includes: Top cover assembly (11), the top cover assembly (11) being the top cover assembly (11) according to any one of claims 1-9. A housing (12) having an opening; The top cover assembly (11) is used to seal the opening; the battery cell (1) also includes a cell assembly, which is installed inside the housing (12).

Images