Battery top cover and battery

Abstract

According to the battery top cover and the battery, the battery top cover comprises the top cover body and the protective layer, the hardness of the protective layer is larger than that of the top cover body, and therefore in the manufacturing process of the top cover, even if the top cover is collided, the protective layer with the large hardness is not prone to collision deformation, scratches and the like, the yield of the battery is increased, and the battery quality is improved. The weight of the battery top cover cannot be obviously increased; the protective layer is located on the side, away from the shell, of the top cover body, when the battery top cover and the shell are welded, the top cover body and the shell are directly welded, the protective layer with high hardness is not welded with the shell, and the arrangement of the protective layer does not affect the welding process of the battery top cover and the shell and does not increase the welding difficulty; the orthographic projection of the protective layer on the first plane covers the orthographic projection of the top cover body on the first plane, so that the protective layer can completely cover the whole surface, far away from the shell, of the top cover body, and the top cover body with relatively low hardness is prevented from being collided and is prevented from being collided and deformed.

Description

Technical Field

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

[0002] Existing battery top covers are generally made of aluminum alloy. The main advantages of aluminum alloy top covers include lightweight design, high temperature resistance, good thermal and electrical conductivity, and ease of processing and forming. However, due to the insufficient hardness of aluminum alloy, the top cover is prone to impact deformation, scratches, and other damage during the manufacturing process, resulting in yield loss. However, replacing the entire top cover with stainless steel to increase its hardness would be detrimental to the lightweight design and would make welding the top cover to the casing difficult.

[0003] Therefore, how to improve the rigidity of the battery top cover without affecting its lightweight design and welding is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery top cover and a battery to solve or partially solve the problems raised in the prior art.

[0005] To achieve the above objectives, a first aspect of this application provides a battery top cover, comprising: a top cover body and a protective layer, wherein the top cover body is used to connect with the battery casing, the protective layer is disposed on the side of the top cover body away from the casing, the hardness of the protective layer is greater than the hardness of the top cover body, and the orthographic projection of the protective layer on a first plane covers the orthographic projection of the top cover body on a first plane, wherein the first plane is the plane in which the top cover body is located.

[0006] Optionally, the ratio of the thickness of the protective layer to the thickness of the battery top cover is 1:15 to 3:15, wherein the thickness direction is perpendicular to the first plane.

[0007] Optionally, the difference between the hardness of the protective layer and the hardness of the top cover body is greater than or equal to 20 HB.

[0008] Optionally, the hardness of the protective layer is greater than or equal to 60HB.

[0009] Optionally, the protective layer includes a plurality of sidewalls, each of which extends along a first direction perpendicular to the first plane;

[0010] The battery top cover also includes a first black plating layer, which is disposed on at least one of the sidewalls away from the protective layer. The top surface of the first black plating layer is flush with the top surface of the protective layer, and the top surface is the surface away from the top cover body.

[0011] Optionally, the first black plating layer is disposed on the side of each of the sidewalls away from the protective layer, and the first black plating layer extends circumferentially along the protective layer.

[0012] Optionally, the top surface of the protective layer includes a central region and an edge region surrounding the outer periphery of the central region; the battery top cover also includes a second black plating layer, which is disposed on the top surface of the protective layer and at least covers the edge region.

[0013] Optionally, the first black plating layer and / or the second black plating layer are made of fluorine material, and / or the protective layer is made of at least one of aluminum-magnesium alloy, titanium alloy, stainless steel, and hard ceramic, and / or the top cover body is made of aluminum-manganese alloy.

[0014] Optionally, the top cover body includes a first body and a second body, the edge of the orthographic projection of the first body on the first plane is located within the orthographic projection of the second body on the first plane, and the protective layer is disposed on the side of the second body away from the first body.

[0015] A second aspect of this application provides a battery including a housing and a battery top cover as described in any of the first aspects above, wherein the housing has an opening, the battery top cover seals the opening, and the top cover body is connected to the housing.

[0016] As can be seen from the above, the battery top cover and battery provided in this application include a top cover body and a protective layer. The hardness of the protective layer is greater than that of the top cover body. Thus, during the manufacturing process of the top cover, even if it is bumped, the protective layer with greater hardness is less likely to be deformed, scratched, or have other defects, which can improve the yield of the battery and will not significantly increase the weight of the battery top cover. The protective layer is located on the side of the top cover body away from the shell. When welding the battery top cover to the shell, the top cover body is directly welded to the shell, while the protective layer with greater hardness is not welded to the shell. Thus, the setting of the protective layer will not affect the welding process between the battery top cover and the shell, nor will it increase the welding difficulty. The orthographic projection of the protective layer on the first plane covers the orthographic projection of the top cover body on the first plane, ensuring that the protective layer can completely cover the entire surface of the top cover body away from the shell, ensuring that the top cover body with less hardness will not be bumped or deformed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 A first cross-sectional schematic diagram of the battery top cover according to an embodiment of this application is shown;

[0019] Figure 2 A schematic diagram of a first structure of the battery top cover according to an embodiment of this application is shown;

[0020] Figure 3 It shows Figure 2 Cross-sectional schematic diagram of BB;

[0021] Figure 4 A schematic diagram of the dual-pass battery cell is shown.

[0022] Figure 5 A first cross-sectional schematic diagram of a battery with a single-sided outlet tab is shown;

[0023] Figure 6 A schematic diagram of a second structure of the battery top cover according to an embodiment of this application is shown;

[0024] Figure 7 A schematic diagram of a third structure of the battery top cover according to an embodiment of this application is shown;

[0025] Figure 8 A second cross-sectional schematic diagram of the battery top cover according to an embodiment of this application is shown;

[0026] Figure 9 A second cross-sectional schematic diagram of a battery with a single-sided output tab is shown;

[0027] Figure 10 An exemplary exploded view of the top cover assembly according to an embodiment of this application is shown.

[0028] In the diagram: 1. Battery top cover; 11. Protective layer; 111. Side wall; 1111. Top edge; 112. Top surface of the protective layer; 1121. Edge area; 1122. Central area; 12. Top cover body; 121. First body; 122. Second body; 13. First black plating layer; 131. Top surface of the first black plating layer; 14. Second black plating layer; 2. Housing; 3. Insulator; 4. Terminal post; 5. Adapter piece; 6. Electrode assembly. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] With the introduction of the "dual carbon" target, the development of the clean energy industry is accelerating, and lithium-ion batteries are playing an indispensable role in this process. Currently, the top cover of prismatic batteries is made of aluminum alloy, which has good explosion resistance, safety, lightweight, corrosion resistance, good processability, and heat transfer properties, making it an ideal material for battery top covers.

[0032] The main advantages of existing aluminum alloy top covers include lightweight design, high temperature resistance, good thermal and electrical conductivity, and ease of processing and forming. However, due to the insufficient hardness of aluminum alloy, the top cover is prone to impact deformation, scratches, and other defects during the manufacturing process, resulting in yield loss. Furthermore, impacts to the aluminum alloy surface can easily produce defects and aluminum shavings, which can also cause poor welding during the top cover welding process, affecting the overall process yield and causing cell loss.

[0033] Therefore, improving the hardness of the battery top cover to avoid impact deformation, scratches, and other damage during the manufacturing process is an urgent problem to be solved.

[0034] In related technologies, the battery top cover is made entirely of hard materials such as stainless steel. This method can increase the rigidity of the battery top cover and avoid problems such as deformation, scratches, and marks caused by bumps during the manufacturing process. However, when the battery top cover is made entirely of hard materials such as stainless steel, on the one hand, it increases the weight of the battery top cover, which is not conducive to the lightweight design of the top cover. On the other hand, the battery casing is generally made of aluminum, and the melting point difference between stainless steel and aluminum casings is significant, leading to welding difficulties and affecting the battery assembly process.

[0035] Therefore, how to improve the rigidity of the battery top cover without affecting its lightweight design and welding is an urgent problem to be solved.

[0036] Based on this, this application provides a battery top cover and a battery.

[0037] Figure 1 A first cross-sectional schematic diagram of the battery top cover 1 according to an embodiment of this application is shown.

[0038] See Figure 1 As shown, the battery top cover 1 provided in this application includes: a top cover body 12 and a protective layer 11. The top cover body 12 is used to connect with the battery housing 2. The protective layer 11 is disposed on the side of the top cover body 12 away from the housing 2. The hardness of the protective layer 11 is greater than the hardness of the top cover body 12. The orthographic projection of the protective layer 11 on a first plane covers the orthographic projection of the top cover body 12 on the first plane. The first plane is the plane where the top cover body 12 is located.

[0039] Specifically, the top cover body 12 is used to connect with the battery casing 2, and the protective layer 11 is located on the side of the top cover body 12 away from the casing 2. Thus, in the actual assembly process of the battery, the protective layer 11 is the outermost layer of the battery top cover 1, and the protective layer 11 is the part of the battery top cover 1 that is most easily bumped.

[0040] The hardness of the protective layer 11 is greater than that of the top cover body 12. Thus, compared to the less hard top cover body 12, the protective layer 11 is harder. During the manufacturing process of the top cover, even if it is bumped, the harder protective layer 11 is less likely to be deformed, scratched, or have other defects. This can improve the yield of the final assembled battery. At the same time, the protective layer 11, which is not easily deformed by bumps, will not fall off due to bumps and will not affect the subsequent welding process.

[0041] In addition, the battery top cover 1 includes a protective layer 11 with higher hardness and a top cover body 12 with lower hardness. In this way, the weight of the protective layer 11 with higher hardness and heavier weight and the top cover body 12 with lower hardness and lighter weight can be balanced, so that the weight of the battery top cover 1 will not be too heavy and will not affect the lightweight of the battery top cover 1.

[0042] In the actual assembly of the battery, the protective layer 11 is located on the side of the top cover body 12 away from the housing 2. Thus, when welding the battery top cover 1 and the housing 2, the top cover body 12 is directly welded to the housing 2, while the protective layer 11, which has a higher hardness, is not welded to the housing 2. Therefore, the setting of the protective layer 11 will not affect the welding process of the battery top cover 1 and the housing 2, nor will it increase the welding difficulty, which is conducive to the actual welding process.

[0043] The orthographic projection of the protective layer 11 on the first plane covers the orthographic projection of the top cover body 12 on the first plane. Specifically, the orthographic projection of the protective layer 11 on the first plane may completely coincide with the orthographic projection of the top cover body 12 on the first plane, or the orthographic projection of the top cover body 12 on the first plane may be located within the orthographic projection of the protective layer 11 on the first plane. No specific limitation is made.

[0044] The orthographic projection of the protective layer 11 on the first plane covers the orthographic projection of the top cover body 12 on the first plane, thus ensuring that the protective layer 11 can completely cover the top cover body 12. In this way, during the manufacturing process of the battery top cover 1, the protective layer 11 can protect the entire surface of the top cover body 12 away from the housing 2, ensuring that the top cover body 12, which has relatively low hardness, will not be bumped or deformed.

[0045] In some embodiments, see continue to see Figure 1 As shown, the ratio of the thickness of the protective layer 11 to the thickness of the battery top cover 1 is 1:15 to 3:15, wherein the thickness direction (i.e., Figure 1 The direction shown in A is perpendicular to the first plane.

[0046] Specifically, when the thickness of the protective layer 11 (i.e. Figure 1 (as shown in b) and the thickness of the battery top cover 1 (i.e. Figure 1 When the ratio of the protective layer 11 to the top cover body 12 is 1:15 to 3:15 (as shown in c), the thickness of the protective layer 11 is moderate, and the deformation resistance and weight are also moderate. The moderate deformation resistance allows the protective layer 11 to effectively protect the top cover body 12, and the moderate weight will not significantly increase the weight of the battery top cover 1, which is conducive to the lightweight design of the battery top cover 1.

[0047] When the thickness of the protective layer 11 (i.e. Figure 1 (as shown in b) and the thickness of the battery top cover 1 (i.e. Figure 1 When the ratio of (as shown in c) is less than 1:15, the thickness of the protective layer 11 is too thin and its resistance to deformation is weak. If the battery top cover 1 is subjected to a large impact during the manufacturing process, the thin protective layer 11 may still be deformed, resulting in a decrease in the yield of the final assembled battery.

[0048] When the thickness of the protective layer 11 (i.e. Figure 1 (as shown in b) and the thickness of the battery top cover 1 (i.e. Figure 1 When the ratio (as shown in c) is greater than 3:15, the protective layer 11 is too thick. Although it can effectively prevent bumps and deformation, the excessively thick protective layer 11 will significantly increase the weight of the battery top cover 1, which is not conducive to the lightweight design of the battery top cover 1.

[0049] For example, the ratio of the thickness of the protective layer 11 to the thickness of the battery top cover 1 can be 1:15, 1.5:15, 2:15, 2.5:15, 3:15, etc.

[0050] In some embodiments, the difference in hardness between the protective layer 11 and the top cover body 12 is greater than or equal to 20 HB. This ensures that the difference in hardness between the protective layer 11 and the top cover body 12 is sufficiently large, meaning that the protective layer 11 is sufficiently hard compared to the top cover body 12. This prevents the protective layer 11 from deforming due to impacts during actual assembly, thus improving the yield of the final assembled battery. Here, HB refers to Brinell hardness.

[0051] In some embodiments, the hardness of the protective layer 11 is greater than or equal to 60HB, which ensures that the hardness of the protective layer 11 is high enough so that it will not be deformed by impact during actual assembly, thereby improving the yield of the final assembled battery.

[0052] During the top cover welding process, pre-welding guidance is required. This involves accurately identifying and gripping the edge of the top cover furthest from the housing 2 by assessing the surface level, in order to adjust the welding trajectory. Currently, the top cover surface is highly reflective, making it difficult to accurately and efficiently identify and grip the edge of the top cover furthest from the housing 2 during pre-welding guidance. This results in low identification accuracy and a yield loss of approximately 0.5%, posing a challenge in the industry.

[0053] In order to solve this problem, the battery top cover 1 of this application has been further improved.

[0054] Figure 2 This paper shows a schematic diagram of a first structural embodiment of the battery top cover 1 according to this application. Figure 3 It shows Figure 2 Cross-sectional schematic diagram of BB in the middle. Figure 4 A schematic diagram of a dual-pass battery cell is shown.

[0055] In some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the protective layer 11 includes a plurality of sidewalls 111, each sidewall 111 extending along a first direction, the first direction being perpendicular to a first plane; the battery top cover 1 also includes a first black plating layer 13, the first black plating layer 13 being disposed on the side of at least one sidewall 111 away from the protective layer 11, the top surface 131 of the first black plating layer 13 being flush with the top surface 112 of the protective layer 11, the top surface 131 of the first black plating layer 13 being the surface of the first black plating layer 13 away from the top cover body 12, and the top surface 112 of the protective layer 11 being the surface of the protective layer 11 away from the top cover body 12.

[0056] Specifically, the first direction is the thickness direction of the protective layer 11 or the battery top cover 1, and the first direction is... Figure 1 The direction shown in A.

[0057] The battery top cover 1 also includes a first black coating layer 13, which is made of a black, non-reflective material. The first black coating layer 13 is disposed on at least one side wall 111 away from the protective layer 11. That is, the first black coating layer 13 may be disposed on only one side wall 111 away from the protective layer 11, or it may be disposed on the side of two opposite side walls 111 away from the protective layer 11, or it may be disposed on the side of all side walls 111 away from the protective layer 11.

[0058] The top surface 131 of the first black plating layer 13 is flush with the top surface 112 of the protective layer 11. Thus, the first black plating layer 13 can cover the top edge 1111 of the side wall 111 (i.e., the edge where the side wall 111 intersects with the top surface 112 of the protective layer 11, and also the edge of the side wall 111 away from the top cover body 12). Since the first black plating layer 13 is not reflective, the top edge 1111 of the side wall 111 covered by the first black plating layer 13 is also not reflective. Therefore, during the pre-welding guidance of the top cover welding process, the non-reflective top edge 1111 is very easy to identify and grasp, improving the accuracy of identification and shortening the identification time.

[0059] For dual-channel cells (i.e. cells with tabs on both sides), the battery top cover 1 and the casing 2 are side-welded. During the pre-welding guidance of the top cover welding process, the side wall 111 of the protective layer 11 is set towards the gripping device. At this time, the side wall 111 covered by the first black plating layer 13 is set towards the gripping device. In this way, the top edge 1111 of the side wall 111, which is not prone to reflection, is very easy to identify and grip, improving the accuracy of identification and shortening the identification time.

[0060] In some embodiments, a first black plating layer 13 is disposed on the side of each sidewall 111 away from the protective layer 11, and the first black plating layer 13 extends circumferentially along the protective layer 11.

[0061] Specifically, the first black coating layer 13 is disposed on the side of each sidewall 111 away from the protective layer 11. Thus, the top edge 1111 of each sidewall 111 of the protective layer 11 is covered by the first black coating layer 13, and the top edge 1111 of each sidewall 111 is not easily reflective. In this way, during the pre-welding guidance of the top cover welding process, it is not necessary to restrict the orientation of a specific sidewall 111 of the protective layer 11 toward the gripping device. Instead, any sidewall 111 can be selected to face the gripping device according to actual needs, which can improve the flexibility and convenience of pre-welding guidance. Furthermore, since the top edge 1111 of any sidewall 111 is not easily reflective, the recognition accuracy of the gripping device can be improved.

[0062] Furthermore, in the first direction, the size of the protective layer 11 is the same as the size of the first black plating layer 13, so that the first black plating layer 13 can completely cover the sidewall 111 of the protective layer 11, which facilitates the actual manufacturing process. If the size of the first black plating layer 13 is too small, it will be difficult to manufacture; if the size of the first black plating layer 13 is too large, it will result in a waste of materials.

[0063] Figure 5 A first cross-sectional schematic diagram of a battery with a single-sided output tab is shown.

[0064] See Figure 5 As shown, for a battery cell with a single-sided tab, the battery top cover 1 and the casing 2 are top-welded. During the pre-welding guidance of the top cover welding process, the top surface 112 of the protective layer 11 faces the gripping device. At this time, if the outer edge of the top surface 112 of the protective layer 11 reflects light, the accuracy of recognition and gripping will be reduced. If a first black plating layer 13 is provided on the side wall 111 of the protective layer 11, the first black plating layer 13 can hardly improve the reflective effect of the outer edge of the top surface 112 of the protective layer 11, resulting in a still low recognition accuracy.

[0065] Therefore, in this application, in order to solve the problem of reflection at the edge of the top surface 112 of the protective layer 11, the battery top cover 1 has been further optimized.

[0066] Figure 6 A schematic diagram of a second structure of the battery top cover 1 according to an embodiment of this application is shown. Figure 7 A schematic diagram of a third structure of the battery top cover 1 according to an embodiment of this application is shown.

[0067] In some embodiments, see Figure 6 and Figure 7 As shown, the top surface 112 of the protective layer 11 includes a central region 1122 and an edge region 1121 surrounding the outer periphery of the central region 1122; the battery top cover 1 also includes a second black plating layer 14, which is disposed on the top surface 112 of the protective layer 11 and at least covers the edge region 1121.

[0068] Specifically, the second black coating 14 is made of a black, non-reflective material.

[0069] The second black plating layer 14 is disposed on the top surface 112 of the protective layer 11 and at least covers the edge region 1121. That is, the second black plating layer 14 can cover only the edge region 1121, or it can cover both the edge region 1121 and the center region 1122 simultaneously, to ensure that the second black plating layer 14 covers at least the outer edge of the top surface 112 of the protective layer 11. Since the second black plating layer 14 is not reflective, the outer edge of the top surface 112 of the protective layer 11 covered by the second black plating layer 14 will not reflect light. In this way, during the pre-welding guidance of the top cover welding process, the outer edge of the top surface 112 of the protective layer 11, which is not reflective, is very easy to identify and grasp, improving the accuracy of identification and shortening the identification time.

[0070] For a battery cell with a single-sided tab, the top cover 1 is welded to the casing 2. During the pre-welding guidance of the top cover welding process, the top surface 112 of the protective layer 11 faces the gripping device. The setting of the second black plating layer 14 makes the outer edge of the top surface 112 of the protective layer 11 less reflective. The outer edge that is less reflective is very easy to identify and grip, improving the accuracy of identification and shortening the identification time.

[0071] It is worth noting that for a battery cell with a single-sided tab, only the second black plating layer 14 can be provided, or both the first black plating layer 13 and the second black plating layer 14 can be provided simultaneously. In this case, the provision of the first black plating layer 13 can increase the friction of the side wall 111, which is beneficial for gripping operations. For a battery cell with a double-sided tab, only the first black plating layer 13 can be provided, or both the first black plating layer 13 and the second black plating layer 14 can be provided simultaneously. In this case, the provision of the second black plating layer 14 can further increase the friction of the top surface 112 of the protective layer 11 and its ability to resist impact and deformation.

[0072] In some embodiments, the first black plating layer 13 and / or the second black plating layer 14 are made of fluorine material, and / or the protective layer 11 is made of at least one of aluminum-magnesium alloy, titanium alloy, stainless steel, and hard ceramic, and / or the top cover body 12 is made of aluminum-manganese alloy.

[0073] Specifically, the first black coating layer 13 and / or the second black coating layer 14 are made of fluorine material, which is a black material with very low light reflectivity and can also be called a non-reflective material.

[0074] The protective layer 11 is made of at least one of the following materials: aluminum-magnesium alloy, titanium alloy, stainless steel, and hard ceramic. These materials all have a hardness greater than 60HB, making them hard materials suitable for use as the material of the protective layer 11, which greatly improves the protective layer 11's resistance to impact and deformation.

[0075] The top cover body 12 is made of aluminum-manganese alloy material. The hardness of aluminum-manganese alloy material is 40HB, which is relatively low, but it is conducive to welding with aluminum shell and reduces the difficulty of welding process.

[0076] Figure 8 This paper shows a second cross-sectional view of the battery top cover 1 according to an embodiment of the present application. Figure 9 A second cross-sectional schematic diagram of a battery with a single-sided output tab is shown.

[0077] In some embodiments, see Figure 8 and Figure 9 As shown, the top cover body 12 includes a first body 121 and a second body 122. The edge of the orthographic projection of the first body 121 on the first plane is located within the orthographic projection of the second body 122 on the first plane. The protective layer 11 is disposed on the side of the second body 122 away from the first body 121.

[0078] Specifically, the edge of the orthographic projection of the first body 121 on the first plane is located within the orthographic projection of the second body 122 on the first plane, that is, the second body 122 completely covers the first body 121 and extends outward, that is, the bottom surface of the second body 122 near the first body 121 forms a stepped structure with the first body 121.

[0079] When welding the battery top cover 1 and the housing 2, the stepped structure facilitates insertion into the housing. At the same time, when laser welding is performed, the first body 121 located inside the housing 2 can block the laser, preventing laser sputtering into the electrode assembly 6 inside the housing 2 and improving battery safety.

[0080] The protective layer 11 is located on the side of the second body 122 away from the first body 121. In this way, when welding the battery top cover 1 and the housing 2, the protective layer 11, which has a higher hardness, will not be welded to the housing 2. Thus, the setting of the protective layer 11 will not affect the welding process between the battery top cover 1 and the housing 2, nor will it increase the welding difficulty.

[0081] This application also provides a battery, which includes a housing 2 and a battery top cover 1 as described in any of the first aspects above. The housing 2 has an opening, the battery top cover 1 seals the opening, and the top cover body 12 is connected to the housing 2.

[0082] Specifically, the battery top cover 1 and the casing 2 together form an accommodating space, within which an electrode assembly 6 is housed. The electrode assembly 6 is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and typically a separator is provided between the first and second electrodes. The portions of the first and second electrodes coated with active material constitute the active body of the electrode assembly 6, while the portions of the first and second electrodes not coated with active material each constitute a first tab and a second tab. In a lithium-ion battery, the first electrode can be a positive electrode, including a positive current collector and positive active material layers disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.; the second electrode can be a negative electrode, including a negative current collector and negative active material layers disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon, etc. In this application, the first tab and the second tab can be located at opposite ends of the active body, or at the same end of the active body, without any specific limitation.

[0083] Figure 10 An exemplary exploded view of the top cover assembly according to an embodiment of this application is shown.

[0084] See Figure 10 As shown, the battery also includes a top cover assembly, which includes the battery top cover 1 of any of the above embodiments, and also includes an insulating member 3 located between the top cover body 12 of the battery top cover 1 and the electrode assembly 6. The insulating member 3 is used to isolate the top cover body 12 from the electrode assembly 6.

[0085] The top cover assembly also includes a terminal post 4, which is insulated and passes through the battery top cover 1. One end of the terminal post 4 is located outside the battery top cover 1, and the other end of the terminal post 4 passes through the battery top cover 1 and is connected to the first or second tab of the electrode assembly 6.

[0086] The top cover assembly also includes an adapter piece 5, which is located between the pole post 4 and the first or second pole tab, and is used to connect the pole post 4 to the first or second pole tab.

[0087] The battery has the technical effects of any of the above embodiments, which will not be elaborated here.

[0088] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0089] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, 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 battery top cover characterized by, The battery top cover comprises: a top cover body for connecting with a shell of a battery, and a protective layer arranged on a side of the top cover body away from the shell, the hardness of the protective layer being greater than the hardness of the top cover body, a projection of the protective layer on a first plane covering a projection of the top cover body on the first plane, the first plane being a plane on which the top cover body is located, the protective layer comprising a plurality of side walls, each of the side walls extending in a first direction perpendicular to the first plane; the battery top cover further comprises a first black plating layer arranged on a side of at least one of the side walls away from the protective layer, a top surface of the first black plating layer being flush with a top surface of the protective layer, the top surface of the first black plating layer being a surface of the first black plating layer away from the top cover body, and the top surface of the protective layer being a surface of the protective layer away from the top cover body; the top cover body comprises a first body and a second body, an edge of a projection of the first body on the first plane being located in a projection of the second body on the first plane, and the protective layer being arranged on a side of the second body away from the first body.

2. The battery header of claim 1, wherein, The ratio of the thickness of the protective layer to the thickness of the battery top cover is 1:15-3:15, wherein the thickness direction is perpendicular to the first plane.

3. The battery header of claim 1, wherein, The difference between the hardness of the protective layer and the hardness of the top cover body is greater than or equal to 20 HB.

4. The battery header of claim 3, wherein, The hardness of the protective layer is greater than or equal to 60 HB.

5. The battery header of claim 1, wherein, The first black plating layer is arranged on a side of each of the side walls away from the protective layer, and the first black plating layer extends in a circumferential direction of the protective layer.

6. The battery header of claim 1, wherein, The top surface of the protective layer comprises a central region and an edge region surrounding an outer periphery of the central region, and the battery top cover further comprises a second black plating layer arranged on the top surface of the protective layer and covering at least the edge region.

7. The battery header of claim 6, wherein, The first black plating layer and / or the second black plating layer is made of a fluorine material.

8. A battery, characterized by The battery top cover comprises a shell and a battery top cover as claimed in any one of claims 1-7, the shell being provided with an opening, the battery top cover sealing the opening, and the top cover body being connected with the shell.

Images