Top cover assembly of secondary battery and secondary battery

Abstract

The utility model relates to a top cover assembly of a secondary battery and the secondary battery. The top cover assembly comprises a top cover piece, a current collecting component, a current collecting component plastic part and a pole column assembly, and at least one tab lead-out hole is formed in the top cover piece; the current collecting component plastic part is arranged between the top cover piece and the current collecting component, the current collecting component is fixedly connected with the top cover piece through the current collecting component plastic part, and at least one first tab through hole is formed in the current collecting component plastic part; the tab lead-out hole and the first tab through hole are used for enabling tabs to pass through in sequence, and the current collecting component is used for being conductively connected with the tabs; the pole assembly is located on the side, away from the top cover piece, of the current collecting component plastic part, the pole assembly comprises a pole conductive block, and the pole conductive block is in conductive connection with the current collecting component. By means of the top cover assembly, the capacity and safety of the secondary battery are improved.

Description

TECHNICAL FIELD

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

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharging to continue to be used. A secondary battery generally includes a shell, an electrode assembly, a top cover, a current collecting member, etc. The electrode assembly and the current collecting member are arranged inside the shell, and the top cover seals the opening of the shell. The electrode assembly includes a tab and an electrode assembly body. During the assembly process of the secondary battery, the tab is gathered after being heat-pressed, the tab is welded on the current collecting member, and the tab is connected with the top cover through the welding connection of the current collecting member and the top cover post. In the existing structure, since the current collecting member and the tab are both located inside the shell, on the one hand, a large amount of internal space of the electrode assembly is occupied, resulting in a low battery capacity, and on the other hand, the current collecting member and the tab are easy to contact with the electrode assembly body, resulting in a short circuit and thus a safety risk. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the present application is the problem of occupying a large amount of internal space of the battery and poor safety of the battery caused by the fact that the current collecting member and the tab are both located inside the shell.

[0004] The technical solution adopted by the present application to solve the above technical problem is a top cover assembly of a secondary battery, comprising: a top cover sheet, a current collecting member, a current collecting member plastic part, and a post assembly, wherein at least one tab leading hole is arranged on the top cover sheet; the current collecting member plastic part is arranged between the top cover sheet and the current collecting member, the current collecting member is fixedly connected with the top cover sheet through the current collecting member plastic part, at least one first tab through hole is arranged on the current collecting member plastic part, the tab leading hole and the first tab through hole are used for the tab to pass through in sequence, and the current collecting member is used for conductive connection with the tab; the post assembly is located on the side of the current collecting member plastic part away from the top cover sheet, and the post assembly comprises a post conductive block, and the post conductive block is in conductive connection with the current collecting member.

[0005] In an embodiment of the present application, the current collecting member plastic part partially extends into the tab leading hole, so as to realize the insulation between the tab and the top cover sheet; and / or an insulating material is coated on the hole wall of the tab leading hole.

[0006] In an embodiment of the present application, the current collecting member plastic part has a first groove opening in a direction away from the top cover sheet, and the current collecting member is at least partially accommodated in the first groove; and / or, the pole post assembly is at least partially accommodated in the first groove.

[0007] In an embodiment of the present application, one of the current collecting member and the current collecting member plastic part is provided with a fixing protrusion, and the other is provided with a fixing through hole, and the fixing protrusion and the fixing through hole are one-to-one corresponding; and / or, one of the top cover sheet and the current collecting member plastic part is provided with a fixing groove, and the other is provided with a fixing boss, and the fixing groove and the fixing boss are one-to-one corresponding.

[0008] In an embodiment of the present application, the current collecting member is provided with a pole post, the pole post conductive block is provided with a first through hole, the pole post is arranged in the first through hole, and the pole post is in contact with the hole wall of the first through hole to form a conductive connection with the pole post conductive block.

[0009] In an embodiment of the present application, the current collecting member has a third groove opening in a direction away from the top cover sheet, and the pole post conductive block is at least partially arranged in the third groove, and the outer circumferential surface of the pole post conductive block is at least partially in contact with the inner side surface of the third groove.

[0010] In an embodiment of the present application, the current collecting member is provided with at least one second tab through hole for conductive connection of a tab with the surface of the current collecting member away from the top cover sheet after the tab passes through the second tab through hole.

[0011] In an embodiment of the present application, the pole post assembly further comprises a pole post conductive block plastic part arranged between the current collecting member and the pole post conductive block.

[0012] In an embodiment of the present application, a lower insulating part is arranged on a side of the top cover sheet away from the current collecting member plastic part, and the lower insulating part is provided with at least one third tab through hole for passing through a tab.

[0013] The present application further provides a secondary battery to solve the above technical problems, which comprises a shell, an electrode assembly, and a top cover assembly as described above, the electrode assembly comprises a tab, and the tab is configured to be conductively connected with the current collecting member after sequentially passing through the tab lead-out hole and the first tab through hole.

[0014] In the top cover assembly of the application, the current collecting member and the current collecting member plastic part are arranged on the top cover sheet, and at least one tab lead-out hole is arranged on the top cover sheet, and at least one first tab through hole is arranged on the current collecting member plastic part, so that the tab passes through the at least one tab lead-out hole and the at least one first tab through hole to reach above the top cover sheet, which can reduce the occupation of the internal space of the secondary battery and improve the capacity and safety of the secondary battery. The current collecting member is fixedly connected with the top cover sheet through the current collecting member plastic part, and the current collecting member plastic part can be formed by injection molding and the fixation between the current collecting member and the top cover sheet can be realized, so that the assembly process is simple. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described in detail below with reference to the drawings.

[0016] Figure 1 is an explosion schematic diagram of a secondary battery of an embodiment of the application;

[0017] Figure 2 is one of the explosion schematic diagrams of a top cover assembly of an embodiment of the application;

[0018] Figure 3 is the second of the explosion schematic diagrams of a top cover assembly of an embodiment of the application;

[0019] Figures 4 to 6 are top views of the top cover assembly of an embodiment of the application;

[0020] Figure 7 is a sectional view along the BB line in Figure 4 ;

[0021] Figure 8 is an enlarged schematic diagram of the area A in Figure 7 ;

[0022] Figure 9 is an explosion schematic diagram of a secondary battery of another embodiment of the application;

[0023] Figure 10 is an explosion schematic diagram of a top cover assembly of a secondary battery of another embodiment of the application;

[0024] Figures 11 to 13 are top views of the top cover assembly of another embodiment of the application;

[0025] Figure 14 is a sectional view along the CC line in Figure 13 . DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described in detail below with reference to the drawings.

[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details. In other instances, well-known methods have not been described in detail in order not to unnecessarily obscure aspects of the present application.

[0028] As used in this application and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a" or "the" element or steps includes a single as well as two or more of those elements or steps. In this disclosure and the claims, the terms "including" and "comprising" are used in their open-ended, conventional sense unless otherwise indicated. Thus, use of the terms "including" and "comprising" throughout the present disclosure should not be interpreted as preferential or indicating more preferred embodiments.

[0029] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "top", "bottom", and the like are based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the outline of the components themselves.

[0030] In addition, it should be noted that the use of "first", "second", and the like words of similar meaning are used to distinguish between similar elements, and do not have special meanings unless otherwise stated. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some terms mentioned in the specification of the present application can be selected by the applicant according to his or her judgment, and the detailed meanings thereof are described in the relevant part of the description. In addition, the present application is not understood only by the actual terms used, but also by the meaning implied by each term.

[0031] Hereinafter, embodiments of the present application will be described based on the drawings. However, the embodiments shown below are examples of a top cover assembly and a secondary battery that embody the technical idea of the present application, and the top cover assembly and the secondary battery of the present application are not limited to the following content. Furthermore, in order to easily understand the scope of the claims, the numbers corresponding to the components shown in the embodiments are assigned to the components shown in the "Claims" and "Summary" columns. However, the components shown in the claims are by no means limited to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments are not intended to limit the scope of the present application to only these, but are merely illustrative examples.

[0032] However, the size or positional relationship of the components shown in the drawings is sometimes exaggerated for the sake of clear illustration. Furthermore, in the following description, the same names, symbols, and the like represent the same or similar components, and detailed description thereof is appropriately omitted. Furthermore, the elements constituting the present application can be in a form in which the same components constitute a plurality of elements so that one component serves multiple elements, or, conversely, a form in which a plurality of components share the function of one component. In addition, the contents described in some embodiments, modes of implementation, and the like can be utilized in other embodiments, modes of implementation, and the like. In addition, in the present specification, "upper" is not limited to the case where it is in contact with the upper surface, but also includes the case where it is formed separately upward, and is also used with the meaning that it also includes the case where there is an intervening layer between layers.

[0033] The top cover assembly of the secondary battery of the present application is applicable to various types of secondary batteries, including but not limited to nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, polymer lithium-ion batteries, etc. The shape of the secondary battery includes square, round, etc. The present specification takes a square battery as an example for description.

[0034] Figure 1 is a schematic diagram of an explosion of a secondary battery according to an embodiment of the present application. Figure 2 is one of the schematic diagrams of an explosion of a top cover assembly according to an embodiment of the present application. Figure 3 is another schematic diagram of an explosion of a top cover assembly according to an embodiment of the present application. Referring to Figure 1 , the secondary battery 100 includes a housing 110, an electrode assembly 120, and a top cover assembly 130. Referring to Figure 2 and Figure 3 , the top cover assembly 130 includes a top cover sheet 210, a current collecting member 220, a current collecting member plastic part 230, and a pole assembly 240. Among them, the top cover sheet 210 is provided with at least one tab lead-out hole 211 for allowing the tab to pass through from the at least one tab lead-out hole 211; the current collecting member plastic part 230 is arranged between the top cover sheet 210 and the current collecting member 220, the current collecting member 220 is fixedly connected with the top cover sheet 210 through the current collecting member plastic part 230, and the current collecting member plastic part 230 is provided with at least one first tab through hole 231; the tab lead-out hole 211 and the first tab through hole 231 are used for allowing the tab to pass through in sequence, and the current collecting member 220 is used for electrically connecting with the tab; the pole assembly 240 is located on the side of the current collecting member plastic part 230 away from the top cover sheet 210, and includes a pole conductive block 241, which is electrically connected with the current collecting member 220.

[0035] In the top cover assembly 130 of the present application, the current collecting member 220 is arranged above the top cover sheet 210, while the top cover sheet 210 is provided with at least one tab leading hole 211, and the current collecting member plastic part 230 is provided with at least one first tab through hole 231, so that the tab passes through the tab leading hole 211 and the first tab through hole 231 to reach above the top cover sheet 210. Since the current collecting member plastic part 230, the current collecting member 220 and the tab are all located above the top cover sheet 210, the occupation of the internal space of the secondary battery can be reduced, the capacity of the secondary battery can be improved, and the tab, the current collecting member 220 and the main body of the electrode assembly 120 can be prevented from contacting, thereby reducing the safety risk.

[0036] In some embodiments, the current collecting member plastic part 230 is arranged between the top cover sheet 210 and the current collecting member 220 by injection molding, so as to fixedly connect the current collecting member 220 and the top cover sheet 210. The injection molding can simplify the assembly process and improve the assembly production efficiency of the top cover assembly.

[0037] In some embodiments, the injection molding material of the current collecting member plastic part 230 is insulating plastic.

[0038] Reference Figure 1 As shown in the figure, the secondary battery 100 further includes a top cover patch 101 located above the top cover sheet 210, a lower insulating part 250 located below the top cover sheet 210, an insulating film patch 102 wrapped around the outer surface of the electrode assembly 120, a bottom support sheet 103 supported below the electrode assembly 120, and an insulating film 104 wrapped around the outer surface of the shell 110. The insulating film patch 102 can be a mylar film.

[0039] As shown in the figure, Figure 2 and Figure 3 In some embodiments, the top cover sheet 210 is further provided with a liquid injection hole 212, an explosion-proof valve 213 and an explosion-proof valve protection patch 214.

[0040] As shown in the figure, Figures 1 to 3 The top cover assembly 130 includes two sets of pole assemblies 240, one of which corresponds to the positive electrode of the secondary battery, and the other of which corresponds to the negative electrode of the secondary battery, for example, respectively referred to as the positive pole assembly and the negative pole assembly. The present application takes one of the pole assemblies as an example for description, and the related content can be used to describe the other pole assembly. It should be noted that the positive pole assembly and the negative pole assembly can be completely the same or different, which is not limited in the present application. Correspondingly, the number of current collecting members 220 on the top cover assembly 130 is also two, which respectively correspond to the positive electrode and the negative electrode of the secondary battery, for example, respectively referred to as the positive current collecting member and the negative current collecting member.

[0041] As shown in the figure, Figure 3As shown, in some embodiments, the current collecting member 220 is provided with a pole post 221, and the pole post conductive block 241 is provided with a first through hole 2411. When assembled, the pole post 221 is arranged in the first through hole 2411, and the pole post 221 is in contact with the hole wall of the first through hole 2411 to form a conductive connection with the pole post conductive block 241. In some embodiments, the pole post assembly 240 further comprises a pole post conductive block plastic piece 242, which is arranged between the current collecting member 220 and the pole post conductive block 241, and plays a role of insulation and fixed sealing, which can improve the stability of the pole post assembly 240. In some embodiments, the pole post conductive block plastic piece 242 is provided with a second through hole 2421, and the pole post 221 is arranged in the second through hole 2421 and the first through hole 2411 in sequence. In some embodiments, the pole post assembly 240 further comprises a sealing ring 260, which is sleeved on the pole post 221 and clamped between the pole post 221 and the pole post conductive block 241. The sealing ring 260 plays a role of sealing. The specific structural features of these embodiments will be described in detail below in combination with Figure 8 Further description is made.

[0042] As Figure 3 shown, the number of the tab lead-out holes 211 on the top cover sheet 210 is 4 in total, of which 2 tab lead-out holes 211 correspond to one electrode, for example, the positive electrode; and the other 2 tab lead-out holes 211 correspond to another electrode, for example, the negative electrode. Each tab lead-out hole 211 is a long strip-shaped slit. It can be understood that for one electrode, the tabs extending from the top of the electrode assembly 120 can be divided into two groups, each corresponding to one tab lead-out hole 211. Figure 3 As shown, the number, shape and position of the tab lead-out holes 211 are not limited.

[0043] As Figure 3 shown, in some embodiments, the lower insulating piece 250 is provided with a third tab through hole 251 corresponding to the tab lead-out hole 211, for allowing the tab to pass therethrough.

[0044] Figure 4 And Figure 5 are top views of the top cover assembly of an embodiment of the present application. Among them, Figure 5 the pole post conductive block 241 is not shown, so that the current collecting member 220 is exposed. According to Figure 5 shown, the tab lead-out holes 211 are exposed on both sides of the current collecting member 220. In other words, as Figure 5As shown, the top cover sheet 210 is rectangular, which has a long side and a short side, and the extension direction of the short side is referred to as the width direction of the secondary battery. The current collecting member 220 has a certain width in the width direction, and the two corresponding tab lead-out holes 211 have a certain interval in the width direction, and the interval is greater than the width of the current collecting member 220, so that the current collecting member 220 can be located between the two tab lead-out holes 211 and the tab lead-out holes 211 are exposed.

[0045] Figure 6 A schematic view showing the tab 610 after being bent out of the tab lead-out hole 211 and the first tab through hole 231 is shown. The bent part 611 of the tab 610 is in close contact with the upper surface of the current collecting member 220. In some embodiments, the bent part 611 is welded to the upper surface of the current collecting member 220.

[0046] Figure 7 is a sectional view along the BB line in Figure 4 . Figure 8 is an enlarged schematic view of the area A in Figure 7 . In combination with Figure 3 and Figure 8 As shown, the pole post 221 is sequentially threaded through the second through hole 2421 and the first through hole 2411, and the pole post 221 is in contact with the hole wall of the first through hole 2411. The sealing ring 260 is sleeved on the pole post 221. As shown in Figure 8 , the pole post conductive block 241 and the pole post conductive block plastic part 242 cooperate with each other to form a stable connection structure. In some embodiments, the pole post conductive block plastic part 242 is formed by injection molding.

[0047] As shown in Figure 3 , in some embodiments, the current collecting member plastic part 230 has a first recess 232, and the opening of the first recess 232 is upward, i.e., the opening is directed away from the top cover sheet 210. After assembly, the current collecting member 220 is at least partially accommodated in the first recess 232, which can limit the current collecting member 220 on one hand, and on the other hand, can increase the creepage distance between the current collecting member 220 and the top cover sheet 210, and improve the insulation effect. For example, the current collecting member 220 includes a bottom plate 222, and the pole post 221 is arranged on the bottom plate 222. In some embodiments, the bottom plate 222 is completely accommodated in the first recess 232, and part or all of the pole post 221 is also accommodated in the first recess 232. In combination with Figure 3 and Figure 8 As shown, the pole post 221 slightly protrudes from the first recess 232.

[0048] In some embodiments, the pole post assembly 240 is at least partially accommodated in the first recess 232. As shown in Figure 8As shown, the pole post conductive block plastic piece 242 in the pole post assembly 240 is completely accommodated in the first groove 232, and the pole post conductive block 241 is partially accommodated in the first groove 232, so that the creepage distance between the pole post assembly 240 and the top cover sheet 210 can be increased, and the insulation effect can be improved.

[0049] In some embodiments, as shown in Figure 3 and Figure 8 The pole post conductive block plastic piece 242 has a second groove 2422, and the pole post conductive block 241 is partially accommodated in the second groove 2422.

[0050] In some embodiments, one of the current collecting member 220 and the current collecting member plastic piece 230 is provided with a fixing protrusion, and the other is provided with a fixing through hole, and the fixing protrusions and the fixing through holes are arranged one-to-one. As shown in Figure 3 In this embodiment, the current collecting member 220 is provided with four fixing through holes 223, and the current collecting member plastic piece 230 is provided with four fixing protrusions 233. After injection molding, each fixing protrusion 233 is arranged in the corresponding fixing through hole 223, so that the current collecting member 220 and the current collecting member plastic piece 230 are fixedly matched with each other, and the fixing effect between them is improved. Figure 3 As shown, the number, shape and position of the fixing protrusions 233 and the fixing through holes 223 are not limited.

[0051] In some embodiments, one of the top cover sheet 210 and the current collecting member plastic piece 230 is provided with a fixing groove, and the other is provided with a fixing boss, and the fixing grooves and the fixing bosses are arranged one-to-one. As shown in Figure 3 and Figure 8 In this embodiment, the current collecting member plastic piece 230 is provided with a fixing boss 234, and the top cover sheet 210 is provided with a fixing groove 215, which is an annular groove, and the fixing boss 234 is correspondingly an annular boss. After injection molding, the fixing boss 234 is arranged in the corresponding fixing groove 215, so that the top cover sheet 210 and the current collecting member plastic piece 230 are fixedly matched with each other, and the fixing effect between them is improved. Figure 3 and Figure 8 As shown, the number, shape and position of the fixing boss 234 and the fixing groove 215 are not limited.

[0052] In some embodiments, the hole wall of the tab lead-out hole 211 is coated with an insulating material to insulate the tab from the top cover sheet 210.

[0053] In some embodiments, the current collector member plastic 230 extends partially into the tab lead-out hole 211 for achieving insulation between the tab and the top cover sheet 210. According to these embodiments, the hole wall of the tab lead-out hole 211 is covered by the extended portion of the current collector member plastic 230, so that the tab is completely insulated from the tab lead-out hole 211.

[0054] Figure 9 is an exploded view of a secondary battery according to another embodiment of the present application. Figure 10 is an exploded view of a top cover assembly of a secondary battery according to another embodiment of the present application. In conjunction with Figure 9 and Figure 10 , the secondary battery 900 includes a housing 910, an electrode assembly 920, and a top cover assembly 930. The top cover assembly 930 includes a top cover sheet 1010, a current collector member 1020, a current collector member plastic 1030, and a tab post assembly 1040. As shown in Figure 9 , in this embodiment, the tab post assembly 1040 includes a tab post conductive block 1041. The tab post conductive block 1041 is a rectangular block object without a through hole.

[0055] In this embodiment, similar to the embodiment shown in Figures 1 to 3 , the top cover assembly 930 includes two sets of tab post assemblies 1040, one set corresponding to the positive electrode of the secondary battery and the other set corresponding to the negative electrode of the secondary battery, for example, referred to as the positive tab post assembly and the negative tab post assembly, respectively. Correspondingly, the number of the current collector members 1020 in the top cover assembly 930 is also two, corresponding to the positive electrode and the negative electrode of the secondary battery, for example, referred to as the positive current collector member and the negative current collector member, respectively.

[0056] Figure 9 In , an insulating film sheet 901 is also shown, disposed on the outer surface of the electrode assembly 920. The insulating film sheet 901 can be a mylar film.

[0057] Figure 10 As shown in Figure 3 , the top cover sheet 1010 is provided with at least one tab lead-out hole 1011 for the tab to pass through from the at least one tab lead-out hole 1011. Similar to the embodiment shown in Figure 10 , in the embodiment shown in , the number of the tab lead-out holes 1011 on the top cover sheet 1010 is four in total, two of which correspond to one electrode and the other two correspond to the other electrode. Each tab lead-out hole 1011 is an elongated slit.

[0058] Figure 10 In some embodiments, as shown inAs shown, the current collector plastic part 1030 is provided with at least one first electrode through hole 1031, and the current collector 1020 is provided with at least one second electrode through hole 1021. The first electrode through hole 1031, the second electrode through hole 1021, and the electrode lead-out hole 1011 correspond to each other. It should be noted that, as Figure 10 As shown, due to the different materials of the positive and negative electrode tabs, the structure of the current collector 1020 on the left side is not exactly the same as the material structure of the current collector 1020 on the right side. In this embodiment, the current collector 1020 on the left side is a positive current collector made of aluminum, while the current collector 1020 on the right side is a negative current collector made of copper-aluminum composite material.

[0059] In some embodiments, such as Figure 10 As shown, the top cover assembly 930 also includes a lower insulating member 1050 disposed below the top cover sheet 1010 for insulating the top cover assembly 930 from the electrode assembly 920. In some embodiments, the lower insulating member 1050 is provided with a third tab through hole 1051 corresponding to the tab lead-out hole 1011.

[0060] and Figure 1 Unlike the embodiment shown, the current collector 1020 does not have a terminal post. The terminal post conductive block 1041 can be directly conductively connected to the current collector 1020.

[0061] In some embodiments, such as Figure 10 As shown, the current collector 1020 has a third groove 1022 with the opening facing upwards, i.e., the opening faces away from the top cover plate 210. The electrode conductive block 1041 is at least partially disposed in the third groove 1022, and the outer peripheral surface of the electrode conductive block 1041 is at least partially in contact with the inner surface of the third groove 1022. On the one hand, it can limit the electrode conductive block 1041, and on the other hand, it can increase the contact area between the electrode conductive block 1041 and the current collector 1020, thereby improving the conductivity. The current collector 1020 and the electrode conductive block 1041 can be connected by seam welding on the contacting side.

[0062] Figures 11 to 13 These are top views of the top cover assembly according to another embodiment of this application. Figure 11 The electrode conductive block 1041 is shown. Figure 12 The electrode conductive block 1041 is not shown, which exposes the current collector 1020. Figure 13The tab 1310 is shown to be bent after passing through the tab lead hole 1011, the first tab through hole 1031 and the second tab through hole 1021 in sequence, and the bent portion 1311 is in close contact with the upper surface of the current collector 1020 (i.e. the surface of the current collector 1020 away from the top cover sheet 210). In some embodiments, the bent portion 1311 is welded to the upper surface of the current collector 1020.

[0063] Figure 14 is a cross-sectional view along the CC line in Figure 13 . As shown in Figure 14 , the pole conductive block 1041 is pressed against the current collector 1020 and is in contact with the bent portion 1311 of the tab 1310, achieving conductive connection.

[0064] In combination with Figure 9 and Figure 14 , the top cover assembly 930 further comprises a sealing ring 940 disposed between the pole conductive block 1041 and the current collector 1020. The sealing ring 940 functions as a seal.

[0065] While the foregoing disclosure discusses some presently contemplated embodiments of the application by way of various examples, it is to be understood that such specifics are to be considered merely illustrative of the application and that additional claims can be made within the scope of the present embodiments and equivalents thereof.

[0066] Similarly, it is to be noted that the foregoing description of the embodiments of the application has been presented for the purpose of illustration and description and is not intended to limit the application as claimed by the claims appended hereto. In some examples, the description of the embodiments of the application has been simplified to highlight aspects of the application and thus, some aspects of the application have been presented in a manner that emphasizes certain features of the application. However, the application as claimed is defined by the claims appended hereto and not by the description of the embodiments of the application.

[0067] Some embodiments use numerical designations to describe components, quantities of ingredients, and the like. It is to be understood that such numerical designations used in the description of the embodiments are, in some examples, modified by the modifier "about" or "approximately." Unless otherwise specified, "about" or "approximately" indicates that the described value allows for a variation of ±20%. Accordingly, numerical parameters such as those outlined in the specification and claims are approximations that can vary depending on the desired properties sought to be obtained by the individual embodiments. In some embodiments, numerical parameters are approximations that can vary depending on the desired properties sought to be obtained by the individual embodiments. In some embodiments, numerical parameters should be considered in the context of the number of significant digits used for measurement and the acceptable error for measurement in the art. Notwithstanding that the numerical ranges and parameters setting forth the broadest scope of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, can contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

Claims

1. A top cover assembly for a secondary battery, characterized in that, The application relates to a top cover assembly for a battery, which comprises a top cover sheet, a current collecting member, a current collecting member plastic part and a pole assembly, wherein at least one pole tab lead-out hole is arranged on the top cover sheet; the current collecting member plastic part is arranged between the top cover sheet and the current collecting member, the current collecting member is fixedly connected with the top cover sheet through the current collecting member plastic part, at least one first pole tab through hole is arranged on the current collecting member plastic part, the pole tab lead-out hole and the first pole tab through hole are used for sequentially leading through pole tabs, the current collecting member is used for conducting electricity with the pole tabs; the pole assembly is located on a side of the current collecting member plastic part away from the top cover sheet, and the pole assembly comprises a pole conducting block which is in conductive connection with the current collecting member. The current collecting member plastic part partially extends into the pole tab lead-out hole, so as to realize insulation between the pole tabs and the top cover sheet; and / or an insulating material is coated on a hole wall of the pole tab lead-out hole. The current collecting member plastic part has a first groove which is open in a direction away from the top cover sheet, and the current collecting member is at least partially accommodated in the first groove; and / or the pole assembly is at least partially accommodated in the first groove. One of the current collecting member and the current collecting member plastic part is provided with a fixing protrusion, and the other is provided with a fixing through hole; and / or one of the top cover sheet and the current collecting member plastic part is provided with a fixing groove, and the other is provided with a fixing boss. The current collecting member is provided with a pole, the pole conducting block is provided with a first through hole, the pole is arranged in the first through hole, and the pole is in contact with a hole wall of the first through hole to form conductive connection with the pole conducting block. The current collecting member has a third groove which is open in a direction away from the top cover sheet, and the pole conducting block is at least partially arranged in the third groove, and an outer circumferential surface of the pole conducting block is at least partially in contact with an inner side surface of the third groove.

2. The cap assembly of claim 1, wherein, The current collecting member is provided with at least one second pole tab through hole, and the second pole tab through hole is used for conducting electricity with a surface of the current collecting member away from the top cover sheet after the pole tab passes through the second pole tab through hole.

3. The cap assembly of claim 1, wherein The pole assembly further comprises a pole conducting block plastic part which is arranged between the current collecting member and the pole conducting block. The application further relates to a battery, which comprises a shell, an electrode assembly and the top cover assembly, the electrode assembly comprises pole tabs which are configured to sequentially pass through the pole tab lead-out hole and the first pole tab through hole and then conduct electricity with the current collecting member.

4. The cap assembly of claim 1, wherein, The application further relates to a battery, which comprises a shell, an electrode assembly and the top cover assembly, the electrode assembly comprises pole tabs which are configured to sequentially pass through the pole tab lead-out hole and the first pole tab through hole and then conduct electricity with the current collecting member.

5. The cap assembly of claim 1, wherein, ​ 6. The cap assembly of claim 1, wherein, ​ 7. The cap assembly of claim 6, wherein ​ 8. The cap assembly of claim 1, wherein, ​ 9. The cap assembly of claim 1, wherein, ​ 10. A secondary battery characterized by comprising: ​

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