Top cover assembly, battery and battery pack

Abstract

The utility model provides a top cover assembly, a battery and a battery pack. The top cover assembly comprises a cover plate, a pole assembly and a terminal assembly, the pole assembly and the terminal assembly are arranged on the cover plate, the terminal assembly is connected with the pole assembly, the material of the terminal assembly comprises copper, and at least part of the surface of the terminal assembly is provided with a first protection layer. According to the top cover assembly, the terminal assembly made of the copper material is adopted, and the first protection layer is arranged on at least part of the surface of the terminal assembly, so that the terminal assembly can be matched with the copper busbar and has relatively good corrosion resistance, and the use performance of the top cover assembly is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a top cover assembly, a battery and a battery pack. BACKGROUND

[0002] A battery pack is composed of a plurality of batteries connected in series or in parallel. In order to reduce the resistivity between the connection structures in the battery pack, a copper bus bar with small resistivity can be used to connect the batteries. In order to match the pure copper bus bar with small resistivity, a copper terminal assembly with small resistivity can also be used in the top cover assembly of the battery. However, the corrosion resistance of the copper terminal assembly in the related technology is poor, thereby the overall use performance of the battery is poor. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a top cover assembly, a battery and a battery pack, which can improve the problem of poor corrosion resistance of the terminal assembly.

[0004] In a first aspect, embodiments of the present application provide a top cover assembly, comprising:

[0005] a cover plate;

[0006] a pole assembly connected with the cover plate;

[0007] a terminal assembly connected with the cover plate, the terminal assembly is connected with the pole assembly, and at least part of a surface of the terminal assembly is provided with a first protective layer.

[0008] In an embodiment, the terminal assembly comprises a first welding surface for welding with a bus bar, and the first welding surface is provided with the first protective layer; and / or,

[0009] the terminal assembly comprises a second welding surface for welding with the pole assembly, and the second welding surface is provided with the first protective layer.

[0010] In an embodiment, the first protective layer comprises a first plating layer, a material of the first plating layer comprises one or more of nickel, chromium, gold, silver and tin, and a thickness of the first plating layer is less than or equal to 100 microns.

[0011] In an embodiment, the first protective layer comprises a first passivation layer, a material of the first passivation layer comprises one or both of copper oxide and cuprous oxide, and a thickness of the first passivation layer is less than or equal to 20 microns.

[0012] In an embodiment, at least part of a surface of the pole assembly is provided with a second protective layer.

[0013] In an embodiment, the pole assembly comprises a third welding surface for welding with the terminal assembly, and the second protective layer is arranged on the third welding surface; and / or,

[0014] The pole assembly comprises a contact surface for contacting with electrolyte, and the second protective layer is arranged on the contact surface.

[0015] In an embodiment, the pole assembly comprises a positive pole, and the positive pole is connected with the terminal assembly, and at least part of the surface of the positive pole is provided with the second protective layer.

[0016] In an embodiment, the positive pole comprises a first connecting part and a second connecting part connected with each other, and the first connecting part is used for connecting with the terminal assembly; and at least part of the surface of the first connecting part is provided with the second protective layer.

[0017] In an embodiment, the pole assembly comprises a negative pole, and the negative pole is connected with the terminal assembly, and at least part of the surface of the negative pole is provided with the second protective layer.

[0018] In an embodiment, the second protective layer comprises a second plating layer, and the material of the second plating layer comprises one or more of nickel, chromium, gold, silver or tin; and the thickness of the second plating layer is less than or equal to 100 microns.

[0019] In an embodiment, the second protective layer arranged on the third welding surface is the second plating layer.

[0020] In an embodiment, the second protective layer comprises a second passivation layer, and the material of the second passivation layer comprises one or both of copper oxide and cuprous oxide; and the thickness of the passivation layer is less than or equal to 20 microns.

[0021] In an embodiment, the second protective layer arranged on the contact surface is the second passivation layer.

[0022] In a second aspect, embodiments of the present application provide a battery, comprising:

[0023] A shell is formed with a receiving cavity;

[0024] An electric core assembly is located in the receiving cavity; and

[0025] The top cover assembly described in any of the above is connected with the shell and the electric core assembly.

[0026] In a third aspect, embodiments of the present application provide a battery pack, comprising the battery described above.

[0027] The beneficial effects of embodiments of the present application are as follows:

[0028] In the embodiment of the present application, the top cover assembly comprises a cover plate, a pole assembly and a terminal assembly, the pole assembly and the terminal assembly are arranged on the cover plate, the terminal assembly is connected with the pole assembly, the material of the terminal assembly comprises copper, and at least part of the surface of the terminal assembly is provided with a first protective layer. By arranging the first protective layer on at least part of the surface of the terminal assembly, the terminal assembly can match the copper bus bar with smaller resistivity while having better corrosion resistance, thereby ensuring the use performance of the top cover assembly. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 is a structural schematic diagram of a top cover assembly provided by an embodiment of the present application;

[0031] Figure 2 is a structural schematic diagram of a terminal assembly provided by an embodiment of the present application;

[0032] Figure 3 is a structural schematic diagram of a positive pole provided by an embodiment of the present application;

[0033] Figure 4 is a structural schematic diagram of another positive pole provided by an embodiment of the present application;

[0034] Figure 5 is a structural schematic diagram of a negative pole provided by an embodiment of the present application;

[0035] Figure 6 is a structural schematic diagram of a battery provided by an embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 10, battery;

[0038] 100, top cover assembly; 110, cover plate; 120, pole assembly; 121, positive pole; 1211, first connecting part; 1212, second connecting part; 122, negative pole; 123, third welding surface; 124, contact surface; 130, terminal assembly; 131, first welding surface; 132, second welding surface; 140, first protective layer; 141, first plating layer; 142, first passivation layer; 150, second protective layer; 151, second plating layer; 152, second passivation layer;

[0039] 200, shell; 210, accommodating cavity;

[0040] 300, the electric cell assembly. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0042] First, the present application provides a top cover assembly, such as Figure 1 and Figure 6 As shown, the top cover assembly 100 includes a cover plate 110, which is used to seal the accommodating cavity 210 in which the electric cell assembly 300 is placed when the top cover assembly 100 is used for the battery 10, so as to achieve the sealing protection of the electric cell assembly 300 and avoid the influence of the external environment on the internal electric cell assembly 300.

[0043] The top cover assembly 100 includes a pole assembly 120, which is arranged on the cover plate 110, and the pole assembly 120 is connected with the cover plate 110. When the top cover assembly 100 is used for the battery 10, the pole assembly 120 serves as two electrodes of the battery 10 and is connected with two poles of the electric cell assembly 300 in the battery 10 respectively, so as to realize the conduction of the internal circuit of the battery 10.

[0044] The top cover assembly 100 includes a terminal assembly 130, which is arranged on the cover plate 110 and connected with the pole assembly 120. When the top cover assembly 100 is used for the battery 10, the terminal assembly 130 serves as the output end of the battery 10 and is used to be connected with an external circuit such as a busbar, so as to realize the conduction of the internal circuit of the battery 10 and the external circuit, thereby enabling the battery 10 to work normally.

[0045] The material of the terminal assembly 130 includes a material with high conductivity such as copper, that is, the terminal assembly 130 can be a copper terminal. When the terminal assembly 130 is used to be connected with the busbar, a copper busbar with small resistivity can be used in cooperation, so as to help reduce the resistivity of the top cover assembly 100 when it is put into use, thereby improving the use performance of the top cover assembly 100.

[0046] In addition, asFigure 2 As shown, since the material of the terminal assembly 130 includes copper and other materials with high activity, the terminal assembly 130 is prone to corrosion when in use, thereby affecting the normal use of the terminal assembly 130. To this end, the first protective layer 140 is arranged on at least part of the surface of the terminal assembly 130, and the first protective layer 140 is used to protect the terminal assembly 130, so as to reduce the risk of corrosion of the terminal assembly 130, thereby helping to further improve the use performance of the top cover assembly 100.

[0047] The top cover assembly 100 includes a cover plate 110, a pole assembly 120, and a terminal assembly 130. The pole assembly 120 and the terminal assembly 130 are arranged on the cover plate 110, and the terminal assembly 130 is connected with the pole assembly 120. The material of the terminal assembly 130 includes copper, and at least part of the surface of the terminal assembly 130 is provided with a first protective layer 140. The first protective layer 140 is arranged on at least part of the surface of the terminal assembly 130, so that the terminal assembly 130 can match the copper bus bar with smaller resistivity while having better corrosion resistance, thereby ensuring the use performance of the top cover assembly 100.

[0048] In some embodiments, as shown, Figure 2 The terminal assembly 130 includes a first welding surface 131 for welding with the bus bar. The first protective layer 140 is arranged on the first welding surface 131, that is, the first protective layer 140 is arranged on at least the first welding surface 131. If the first welding surface 131 of the terminal assembly 130 is corroded, it will directly affect the welding effect of the terminal assembly 130 with the bus bar, thereby affecting the use performance of the top cover assembly 100 when in use.

[0049] In other embodiments, the terminal assembly 130 includes a second welding surface 132 for welding with the pole assembly 120. The first protective layer 140 is arranged on the second welding surface 132, that is, the first protective layer 140 is arranged on at least the second welding surface 132. If the second welding surface 132 of the terminal assembly 130 is corroded, it will directly affect the welding effect of the terminal assembly 130 with the pole assembly 120, thereby directly affecting the use performance of the battery 10 itself.

[0050] In yet other embodiments, the first protective layer 140 is arranged on the first welding surface 131 and the second welding surface 132, that is, the first protective layer 140 is arranged on the surface of the terminal assembly 130 for welding, so as to ensure the welding effect of the terminal assembly 130 when in use, thereby ensuring the use performance of the terminal assembly 130.

[0051] It should be noted that the terminal assembly 130 includes not only the first welding surface 131 and the second welding surface 132, but also other surfaces that are not used for welding. These surfaces can also be provided with the first protective layer 140 to reduce the risk of corrosion during assembly or use, thereby further ensuring the overall use performance of the terminal assembly 130.

[0052] Optionally, the first protective layer 140 includes a first plating layer 141, and the material of the first plating layer 141 includes one or more of nickel, chromium, gold, silver, and tin, i.e., the material of the first plating layer 141 is a corrosion-resistant metal element and a chemical substance, and has good electrical conductivity, so as to ensure the corrosion resistance and electrical conductivity of the terminal assembly 130 during use. Among them, the metal content in the first plating layer 141 is ≥50%, so as to ensure that the first plating layer 141 has good corrosion resistance and electrical conductivity. Correspondingly, when the terminal assembly 130 is welded with the pole assembly 120, the weld pool area is also doped with metal elements such as nickel, chromium, gold, silver, and tin, and the content is ≥20ppm.

[0053] Among them, the thickness of the first plating layer 141 is less than or equal to 100 microns. If the thickness of the first plating layer 141 is too large, it will cause the overall size of the terminal assembly 130 to be large, affecting the overall structural design of the top cover assembly 100, and also excessively increasing the production cost.

[0054] In the actual manufacturing process, the thickness of the first plating layer 141 can be set to 10 microns, 20 microns, 50 microns, 80 microns, or 100 microns, etc., and the specific thickness value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0055] In some embodiments, the first protective layer 140 includes a first passivation layer 142, and the material of the first passivation layer 142 includes one or both of copper oxide and cuprous oxide, i.e., the first passivation layer 142 is a dense oxide layer formed on the surface of the terminal assembly 130, so as to improve the corrosion resistance of the terminal assembly 130.

[0056] Among them, the thickness of the first passivation layer 142 is less than or equal to 20 microns. If the thickness of the first passivation layer 142 is too large, it will cause the surface of the terminal assembly 130 to form a too-thick dense oxide layer, which may affect the electrical conductivity and welding effect of the terminal assembly 130.

[0057] In the actual manufacturing process, the thickness of the first passivation layer 142 can be set to 5 microns, 10 microns, 15 microns, or 20 microns, etc., and the specific thickness value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0058] It should be noted that in the embodiments of the present application, the first plating layer 141 can be arranged on the first welding surface 131 and the second welding surface 132 of the terminal assembly 130, and the first passivation layer 142 can be arranged on other surfaces of the terminal assembly 130, so as to ensure that the terminal assembly 130 has good corrosion resistance and conductivity, and at the same time, the production cost of the terminal assembly 130 is controlled.

[0059] Optionally, as shown in Figures 3 to 5 At least part of the surface of the pole assembly 120 is provided with the second protective layer 150, so as to improve the corrosion resistance of the pole assembly 120 and ensure the stability of the pole assembly 120 during assembly and use.

[0060] In some embodiments, the pole assembly 120 includes a third welding surface 123 for welding with the terminal assembly 130, and the second protective layer 150 is arranged on the third welding surface 123, that is, the second protective layer 150 is arranged at least on the third welding surface 123 of the pole assembly 120. If the third welding surface 123 of the pole assembly 120 is corroded, the welding effect of the pole assembly 120 and the terminal assembly 130 will be directly affected, thereby directly affecting the use performance of the battery 10 itself.

[0061] In other embodiments, the pole assembly 120 includes a contact surface 124 for contacting with the electrolyte, and the second protective layer 150 is arranged on the contact surface 124, that is, the second protective layer 150 is arranged at least on the contact surface 124 of the pole assembly 120 for contacting with the electrolyte, so as to reduce the risk of environmental corrosion of the pole assembly 120 during assembly and the risk of corrosion by the electrolyte during use.

[0062] In yet other embodiments, the second protective layer 150 is arranged on the third welding surface 123 and the contact surface 124, that is, the second protective layer 150 is arranged on the surfaces of the pole assembly 120 for welding and contacting with the electrolyte, so as to ensure the corrosion resistance of the pole assembly 120 when put into use, thereby ensuring the use performance of the pole assembly 120.

[0063] Optionally, as shown in Figure 3 The pole assembly 120 includes a positive pole 121, the positive pole 121 is connected with the terminal assembly 130, the material of the positive pole 121 includes a material with high conductivity such as copper, and at least part of the surface of the positive pole 121 is provided with the second protective layer 150. The positive pole 121 made of copper material is conducive to the welding of the positive pole 121 and the copper terminal assembly 130, thereby helping to improve the conductivity and overcurrent capacity of the top cover assembly 100 during use.

[0064] And since the material of the positive pole 121 includes copper and other active materials with high activity, the positive pole 121 is prone to corrosion when in use, thereby affecting the normal use of the positive pole 121. To this end, the second protective layer 150 is arranged on at least part of the surface of the positive pole 121 to protect the positive pole 121, thereby reducing the risk of corrosion of the positive pole 121, and further improving the use performance of the top cover assembly 100.

[0065] In some embodiments, the positive pole 121 includes a first connecting portion 1211 and a second connecting portion 1212 connected to each other, the first connecting portion 1211 is used to connect with the terminal assembly 130, and the second connecting portion 1212 is used to connect with the battery cell assembly 300 of the battery 10. The material of the first connecting portion 1211 includes copper and other materials with high conductivity, and at least part of the surface of the first connecting portion 1211 is provided with the second protective layer 150. That is, the copper material is selected to make the part of the positive pole 121 used to connect with the terminal assembly 130, to ensure the welding effect of the positive pole 121 and the copper terminal assembly 130, and the second protective layer 150 is arranged on the part of the positive pole 121 to reduce the risk of corrosion of the positive pole 121.

[0066] It should be noted that the second connecting portion 1212 of the positive pole 121 can be made of aluminum material to ensure the welding effect of the positive pole 121 and the positive tab of the roll core in the battery cell assembly 300. Since the second connecting portion 1212 is made of aluminum material, it has relatively good corrosion resistance and stability, and the second protective layer 150 can be selected not to be arranged on the surface of the second connecting portion 1212 to reduce the production cost. The first connecting portion 1211 and the second connecting portion 1212 can be formed by cold working of copper-aluminum composite plate or by cold working process combined with copper-aluminum welding.

[0067] It can be understood that, as shown in Figure 4 When the positive pole 121 is made of aluminum material as a whole, the second protective layer 150 can not be arranged on the entire surface of the positive pole 121 to further reduce the production cost of the top cover assembly 100 as a whole. Of course, to further improve the corrosion resistance and structural stability of the positive pole 121, the second protective layer 150 can also be arranged on the surface of the positive pole 121. The specific design manner can be selected and adjusted according to actual use requirements, which is not specially limited here.

[0068] Optionally, as shown in Figure 5As shown, the pole assembly 120 includes a negative pole 122 connected with the terminal assembly 130, the negative pole 122 is made of a material with high activity such as copper, and at least part of the surface of the negative pole 122 is provided with a second protective layer 150. The negative pole 122 is made of copper, which is helpful for the welding of the negative pole 122 with the copper terminal assembly 130 and the negative pole of the winding core in the battery cell assembly 300, thereby improving the electrical conductivity and overcurrent capacity of the top cover assembly 100 during use; by providing the second protective layer 150 on at least part of the surface of the negative pole 122, the corrosion resistance and structural stability of the negative pole 122 are improved to improve the overall performance of the top cover assembly 100.

[0069] In some embodiments, the second protective layer 150 includes a second plating layer 151, and the material of the second plating layer 151 includes one or more of nickel, chromium, gold, silver, and tin, i.e., the material of the second plating layer 151 is a corrosion-resistant metal element and a chemical substance with good electrical conductivity to ensure the corrosion resistance and electrical conductivity of the pole assembly 120 during use. Among them, the metal content in the second plating layer 151 is ≥50% to ensure that the second plating layer 151 has good corrosion resistance and electrical conductivity. Correspondingly, when the terminal assembly 130 and the pole assembly 120 are welded, the weld pool area is also doped with metal elements such as nickel, chromium, gold, silver, and tin, and the content is ≥20ppm.

[0070] Among them, the thickness of the second plating layer 151 is less than or equal to 100 microns. If the thickness of the second plating layer 151 is too large, it will cause the overall size of the pole assembly 120 to be larger, affecting the overall structural design of the top cover assembly 100, and also excessively increasing the production cost.

[0071] In actual production process, the thickness of the second plating layer 151 can be set to 10 microns, 20 microns, 50 microns, 80 microns or 100 microns, etc., and the specific thickness value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0072] Among them, the second protective layer 150 provided on the third welding surface 123 is a second plating layer 151 to ensure that the pole assembly 120 has good corrosion resistance and good electrical conductivity.

[0073] In other embodiments, the second protective layer 150 includes a second passivation layer 152, and the material of the second passivation layer 152 includes one or both of copper oxide and cuprous oxide, i.e., the second passivation layer 152 is a dense oxide layer formed on the surface of the pole assembly 120 to improve the corrosion resistance of the pole assembly 120.

[0074] The thickness of the second passivation layer 152 is less than or equal to 20 microns. If the thickness of the second passivation layer 152 is too large, a thick and dense oxide layer will be formed on the surface of the pole assembly 120, which may affect the conductivity of the pole assembly 120 and the welding effect.

[0075] In actual production, the thickness of the second passivation layer 152 can be set to 5 microns, 10 microns, 15 microns, or 20 microns, and the specific thickness value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0076] The second protective layer 150 provided on the contact surface 124 is the second passivation layer 152, which reduces the risk of environmental corrosion of the pole assembly 120 during assembly. In addition, compared with the second plating layer 151, the second passivation layer 152 will not cause electrochemical corrosion during use, thereby helping to ensure the structural stability of the pole assembly 120 during use.

[0077] It should be noted that the pole assembly 120 includes not only the third welding surface 123 and the contact surface 124, but also other surfaces that are neither used for welding nor in contact with the electrolyte. These surfaces can also be provided with a second protective layer 150 to reduce the risk of corrosion during assembly or use, thereby further ensuring the overall performance of the pole assembly 120. In addition, the second protective layer 150 provided on these surfaces can be a second plating layer 151 or a second passivation layer 152, and the specific setting method can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0078] Specifically, the combination scheme of the terminal assembly 130 and the negative pole 122 using different protective layer setting methods is shown in Table 1:

[0079] Table 1 Combination scheme of terminal assembly and negative pole

[0080]

[0081] As can be seen from Table 1, when the surface of the terminal assembly 130 is provided with a first plating layer 141 and the surface of the negative pole 122 is provided with a second passivation layer 152, the combination scheme of the terminal assembly 130 and the negative pole 122 has the best comprehensive performance in terms of corrosion resistance, conductivity, and production cost.

[0082] Specifically, the combination scheme of the terminal assembly 130 and the first positive pole 121 (pure aluminum material) using different protective layer setting methods is shown in Table 2:

[0083] Table 2 Combination scheme of terminal assembly and first positive pole

[0084]

[0085]

[0086] As shown in Table 2, when the surface of the terminal assembly 130 is provided with the first plating layer 141 and the surface of the positive pole 121 is not treated, the combination of the terminal assembly 130 and the positive pole 121 (pure aluminum material) has the optimal comprehensive performance of corrosion resistance, electrical conductivity and manufacturing cost.

[0087] Specifically, the combination of the terminal assembly 130 and the second positive pole 121 (copper + aluminum material) using different protective layer setting modes is shown in Table 3.

[0088] Table 3 Combination of terminal assembly and second positive pole

[0089]

[0090] As shown in Table 3, when the surface of the terminal assembly 130 is provided with the first plating layer 141 and the surface of the positive pole 121 is provided with the second passivation layer 152, the combination of the terminal assembly 130 and the positive pole 121 (copper + aluminum material) has the optimal comprehensive performance of corrosion resistance, electrical conductivity and manufacturing cost.

[0091] It should be noted that the ranking of different schemes in Table 1, Table 2 and Table 3 in the embodiments of the present application is based on the comprehensive consideration of the requirements of the top cover assembly 100 in terms of corrosion resistance, electrical conductivity and manufacturing cost, and for different design requirements, the arrangement mode will be adjusted accordingly, and no special limitation is made here.

[0092] In addition, it should be noted that in the above schemes, the surface of the terminal assembly 130 provided with the first plating layer 141 means that the area of the surface of the terminal assembly 130 covered by the first plating layer 141 is ≥ 90%; the surface of the negative pole 122 provided with the second plating layer 151 means that the area of the surface of the negative pole 122 covered by the second plating layer 151 is ≥ 90% or the area of the surface of the negative pole 122 not in contact with the electrolyte covered by the second plating layer 151 is ≥ 90%; the surface of the positive pole 121 provided with the second plating layer 151 means that the area of the surface of the positive pole 121 covered by the second plating layer 151 is ≥ 90% or the area of the surface of the positive pole 121 not in contact with the electrolyte covered by the second plating layer 151 is ≥ 90%.

[0093] Secondly, the present application provides a battery, which comprises a top cover assembly, and the specific structure of the top cover assembly is referred to the above embodiments. Since the battery adopts all the technical schemes of the above embodiments, it at least has all the beneficial effects brought by the technical schemes of the above embodiments, which will not be repeated here.

[0094] As shown in Figure 6 , the battery 10 includes a shell 200, a battery cell assembly 300 and a top cover assembly 100, the shell 200 is formed with a receiving cavity 210, the battery cell assembly 300 is located in the receiving cavity 210, and the top cover assembly 100 is connected with the shell 200 and the battery cell assembly 300. The top cover assembly 100 and the shell 200 jointly form a protection structure for the battery cell assembly 300 to avoid the influence of the external environment on the internal battery cell assembly 300, and the top cover assembly 100 serves as an output end of the battery 10 to be connected with the internal battery cell assembly 300 and an external circuit, so that the battery 10 is connected with the external circuit to realize normal use of the battery 10.

[0095] Specifically, as shown in Figure 1 and Figure 2 , the top cover assembly 100 includes a cover plate 110, a pole assembly 120 and a terminal assembly 130, the pole assembly 120 and the terminal assembly 130 are arranged on the cover plate 110, the terminal assembly 130 is connected with the pole assembly 120, the material of the terminal assembly 130 includes copper, and at least part of the surface of the terminal assembly 130 is provided with a first protective layer 140. By arranging the first protective layer 140 on at least part of the surface of the terminal assembly 130, the terminal assembly 130 can match the copper busbar with smaller resistivity while having better corrosion resistance, thereby ensuring the use performance of the top cover assembly 100.

[0096] Finally, the application provides a battery pack, which includes a battery, and the specific structure of the battery is referred to the above embodiments. Since the battery pack adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0097] The battery pack includes a plurality of batteries 10 and a busbar, the busbar is used to be connected with the terminal assembly 130 of the battery 10 to realize series or parallel connection between the plurality of batteries 10, thereby meeting different use requirements of the battery pack.

[0098] The above has introduced the embodiments of the application in detail, and the principle and implementation mode of the application have been described by applying specific examples; the above embodiment is only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range can be changed, and the above description should not be understood as the limitation of the application.

Claims

1. A cap assembly, characterized by, include: Cover plate; The pole assembly is connected to the cover plate; A terminal assembly connected to the cover plate, the terminal assembly connected to the pole assembly, and at least a portion of the surface of the terminal assembly having a first protective layer.

2. The roof assembly of claim 1, wherein, The terminal assembly includes a first welding surface for welding to a busbar, the first welding surface having the first protective layer disposed thereon; and / or The terminal assembly includes a second welding surface for welding to the pole assembly, and the first protective layer is disposed on the second welding surface.

3. The roof assembly of claim 1, wherein, The first protective layer includes a first plating layer, the material of which includes one or more of nickel, chromium, gold, silver and tin; the thickness of the first plating layer is less than or equal to 100 micrometers.

4. The roof assembly of claim 1, wherein, The first protective layer includes a first passivation layer, the material of which includes one or both of copper oxide and cuprous oxide; the thickness of the first passivation layer is less than or equal to 20 micrometers.

5. The roof assembly of any one of claims 1 to 4, wherein, At least a portion of the surface of the pole assembly is provided with a second protective layer.

6. The roof assembly of claim 5, wherein, The pole assembly includes a third welding surface for welding to the terminal assembly, and the second protective layer is disposed on the third welding surface; and / or, The electrode assembly includes a contact surface for contacting the electrolyte, and the second protective layer is disposed on the contact surface.

7. The roof assembly of claim 5, wherein, The electrode assembly includes a positive electrode, which is connected to the terminal assembly, and at least a portion of the surface of the positive electrode is provided with the second protective layer.

8. The roof assembly of claim 7, wherein, The positive electrode post includes a first connecting part and a second connecting part that are connected to each other. The first connecting part is used to connect to the terminal assembly. At least a portion of the surface of the first connecting part is provided with the second protective layer.

9. The roof assembly of claim 5, wherein, The electrode assembly includes a negative electrode, which is connected to the terminal assembly, and at least a portion of the surface of the negative electrode is provided with the second protective layer.

10. The roof assembly of claim 6, wherein, The second protective layer includes a second plating layer, the material of which includes one or more of nickel, chromium, gold, silver or tin; the thickness of the second plating layer is less than or equal to 100 micrometers.

11. The roof assembly of claim 10, wherein, The second protective layer provided on the third welding surface is the second plating layer.

12. The roof assembly of claim 6, wherein, The second protective layer includes a second passivation layer, the material of which includes one or both of copper oxide and cuprous oxide; the thickness of the passivation layer is less than or equal to 20 micrometers.

13. The roof assembly of claim 12, wherein, The second protective layer provided on the contact surface is the second passivation layer.

14. A battery, characterized by include: The shell has a receiving cavity; The battery cell assembly is located within the receiving cavity; as well as The top cover assembly according to any one of claims 1 to 13, wherein the top cover assembly is connected to the housing and the cell assembly.

15. A battery pack, characterized by Includes the battery as described in claim 14.

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