Top cover assembly and battery

Abstract

The invention discloses a top cover assembly and a battery, the top cover assembly comprises a top cover sheet, a pole, a connecting piece, a fixing piece and a plastic piece, the top cover sheet is provided with a first connecting hole; the pole penetrates through the first connecting hole; the connecting piece is connected to one side, deviating from the battery cell, of the top cover plate and is used for connecting the first component; the fixing piece surrounds the peripheral side of the connecting piece, and the fixing piece is connected with the top cover piece; the plastic part is arranged between the connecting part and the fixing part; the fixing piece surrounds the peripheral side of the connecting piece, and the connecting piece is connected with the top cover plate through the fixing piece, so that when the connecting piece is welded with the pole, the connecting strength between the connecting piece and the top cover plate can be increased under the action of the fixing piece, and the two sides of the connecting piece are prevented from tilting, so that the flatness of the connecting piece is ensured, and the service life of the pole is prolonged. And the connecting quality of the connecting piece and the first component is ensured.

Description

Technical Field

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

[0002] In the current new energy market, there is an increasing need for fast-charging batteries with performance and structural capabilities to meet large capacity requirements. In related technologies, adjacent batteries are connected in series and parallel to form a battery pack through connectors. However, during the welding process between the connectors and the terminals, the surface of the connectors is prone to warping, resulting in an uneven surface that affects the welding quality between the connectors and other components, and consequently, the current-carrying performance of the battery pack. Summary of the Invention

[0003] This application provides a top cover assembly and a battery to at least partially solve the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a top cover assembly is provided, comprising a top cover sheet, a terminal post, a connector, a fixing member, and a plastic part. The top cover sheet has a first connection hole; the terminal post passes through the first connection hole; the connector is connected to the side of the top cover sheet opposite to the battery cell, and the connector is used to connect a first component; the fixing member surrounds the outer periphery of the connector and is connected to the top cover sheet; and the plastic part is disposed between the connector and the fixing member, such that the fixing member and the connector are connected and fixed through the plastic part.

[0005] In some embodiments, the top cover assembly further includes a seal, at least a portion of which is disposed between the connector and the top cover sheet, the seal serving to seal between the connector and the top cover sheet.

[0006] In some embodiments, the connector includes: A first connecting portion, which connects to the plastic part, and a second connecting hole is provided on the first connecting portion; and... The second connecting part is disposed in the second connecting hole and is connected to the pole post; The second connecting part is made of the same material as the pole post.

[0007] In some embodiments, a portion of the seal abuts against both the first connection portion and the second connection portion simultaneously.

[0008] In some embodiments, the thickness of the second connecting portion is less than the thickness of the first connecting portion.

[0009] In some embodiments, the outer periphery of the connector is provided with a limiting protrusion, and the connector portion is located between the fixing member and the top cover plate.

[0010] In some embodiments, the fastener includes: A first fixing part is connected to the top cover plate; A second fixing part, which is connected to the first fixing part, and the second fixing part is bent toward the side away from the top cover plate; and, A third fixing part is connected to the end of the second fixing part away from the first fixing part, such that the connecting part is located between the third part and the top cover plate.

[0011] In some embodiments, the plastic part is wrapped around the second fixing part and the third fixing part.

[0012] In some embodiments, the top cover sheet has a recess on the side opposite to the battery cell, and at least a portion of the fixing member is disposed in the recess.

[0013] In some embodiments, the bottom wall of the recess is spaced apart from the connector, such that at least a portion of the plastic part is sandwiched between the recess and the connector.

[0014] In some embodiments, the pole includes: The first pole post is connected to the second connecting part; The second electrode post is connected to the side of the first electrode post facing the battery cell. The second electrode post extends along the length of the top cover plate and is used to connect to the battery cell.

[0015] In some embodiments, the top cover assembly further includes an insulating member disposed between the side of the top cover sheet facing the battery cell and the second terminal portion, the insulating member serving to insulate the side of the top cover sheet facing the battery cell and the second terminal portion.

[0016] According to a second aspect of this application, a battery is provided, comprising a housing, a battery cell, and the aforementioned top cover assembly, wherein the housing includes a receiving cavity and an opening, the battery cell is disposed in the receiving cavity, and the top cover assembly is disposed in the receiving cavity to close the opening.

[0017] In the top cover assembly of this application embodiment, since the fixing member surrounds the outer periphery of the connector, the connector is connected to the top cover piece through the fixing member. When the connector is welded to the pole, the fixing member can increase the connection strength between the connector and the top cover piece, prevent the two sides of the connector from warping, thereby ensuring the flatness of the connector and thus ensuring the connection quality between the connector and the first component.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the overall structure of the top cover assembly provided in an exemplary embodiment of this disclosure; Figure 2 This is an internal cross-sectional view of the top cover assembly provided in an exemplary embodiment of this disclosure; Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle; Figure 4 yes Figure 1 The diagram shows the structure of the connector in the top cover assembly. Figure 5 yes Figure 3 Enlarged diagram of part B.

[0021] Explanation of reference numerals in the attached figures: 1. Top cover assembly; 11. Top cover plate; 111. First connecting hole; 112. Recess; 12. Pole post; 121. First pole post section; 122. Second pole post section; 13. Connector; 131. First connecting part; 132. Second connecting part; 133. Limiting protrusion; 14. Fastener; 141. First fixing part; 142. Second fixing part; 143. Third fixing part; 15. Plastic parts; 16. Sealing element; 161. First sealing part; 162. Second sealing part; 17. Insulating components. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] In related technologies, there is an increasing need for fast-charging batteries to meet the structural requirements of large capacity. Currently, there are three structures in the market: (1) a minimalist structure, which mainly involves first coating the electrode post 12 and the welding ring with glue, and then welding the welding ring to the top cover plate 11; the welding area is large, and it is easy to have defects such as explosion points and false welds, which cannot meet the long-term reliability requirements.

[0024] (2) Riveting structure: the pole 12 and the riveting block are riveted first and then welded; the riveting of a single pole 12 cannot meet the charging and discharging of large current, and the flatness of the pole block cannot meet the welding with the Busbar.

[0025] (3) Traditional encapsulation structure, the top cover assembly 1 is directly encapsulated as a whole; at present, it can only meet the existing 0.5C to 1C charge and discharge, and cannot meet the large overcurrent charge and discharge.

[0026] This application provides a top cover assembly 1 and a battery. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the top cover assembly 1 provided in an embodiment of this application.

[0027] A top cover assembly 1 includes a top cover plate 11, a terminal post 12, a connector 13, a fixing member 14, and a plastic part 15. The top cover plate 11 has a first connection hole 111; the terminal post 12 passes through the first connection hole 111; the connector 13 is connected to the side of the top cover plate 11 away from the battery cell, and the connector 13 is used to connect a first component; the fixing member 14 surrounds the outer periphery of the connector 13 and is connected to the top cover plate 11; and the plastic part 15 is disposed between the connector 13 and the fixing member 14, so that the fixing member 14 and the connector 13 are connected and fixed by the plastic part 15.

[0028] In the top cover assembly 1 of this application embodiment, since the fixing member 14 surrounds the outer periphery of the connector 13, the connector 13 is connected to the top cover piece 11 through the fixing member 14. When the connector 13 is welded to the pole post 12, the connection strength between the connector 13 and the top cover piece 11 can be increased under the action of the fixing member 14, preventing the two sides of the connector 13 from warping up, thereby ensuring the flatness of the connector 13, and thus ensuring the connection quality between the connector 13 and the first component.

[0029] Furthermore, the fastener 14 strengthens the connection between the connector 13 and the top cover plate 11, thereby preventing the connector 13 from moving on the top cover plate 11, thus ensuring the sealing performance of the battery, preventing battery seal failure, and ensuring normal battery use.

[0030] It should also be noted that in this embodiment, the first component is a busbar, which can connect multiple individual batteries in series and parallel to form a group, taking into account both mechanical strength and insulation and heat dissipation.

[0031] In this way, by ensuring the flatness of the inner and outer surfaces of the connector 13, the welding quality of the connector 13 and the busbar is guaranteed, thereby increasing the current contact area, improving the current carrying capacity of the battery, and meeting the current carrying requirements of the battery.

[0032] In some embodiments, refer to Figure 3 As shown, the top cover assembly 1 also includes a seal 16, at least a portion of which is disposed between the connector 13 and the top cover piece 11. The seal 16 is used to seal the connection between the connector 13 and the top cover piece 11.

[0033] Thus, by providing the seal 16, insulation between the connector 13 and the top cover plate 11 can be guaranteed, so as to avoid direct contact and short circuit between the connector 13 and the top cover plate 11, thereby ensuring the normal use of the battery.

[0034] In some embodiments, refer to Figure 4 As shown, the connector 13 includes a first connecting part 131 and a second connecting part 132. The first connecting part 131 is connected to the plastic part 15 and has a second connecting hole. The second connecting part 132 is disposed in the second connecting hole and is connected to the pole post 12. The second connecting part 132 and the pole post 12 are made of the same material.

[0035] In this way, the second connecting part 132 and the terminal post 12 can be made of the same material, which facilitates the connection between the second connecting part 132 and the terminal post 12, and increases the current carrying capacity of the top cover assembly 1, thus ensuring the performance of the battery.

[0036] It should also be noted that in this embodiment, when the pole 12 is the negative pole 12, the second connecting part 132 and the pole 12 are both made of copper, while the first connecting part 131 is made of aluminum.

[0037] When the electrode post 12 is the positive electrode post 12, the first connecting part 131, the second connecting part 132 and the electrode post 12 are all made of aluminum.

[0038] It is understandable that by setting the second connection part 132, a fuse structure can be formed in the second connection part 132. When an abnormality occurs in the circuit, the fuse can be formed in the second connection part 132 to cut off the current in time and ensure electrical safety.

[0039] In some embodiments, a portion of the seal 16 abuts against both the first connecting portion 131 and the second connecting portion 132.

[0040] Thus, by setting the sealing element 16 at the connection between the first connecting part 131 and the second connecting part 132, when the materials of the first connecting part 131 and the second connecting part 132 are different, that is, when the electrode post 12 is the negative electrode post 12, the sealing element 16 can achieve the sealing between the connection between the first connecting part 131 and the second connecting part 132 and the top cover plate 11, which can ensure that the copper and aluminum interface of the connector 13 is isolated, that is, ensure that in the electrolyte environment, the copper and aluminum interface of the connector 13 will not form a conductive circuit, thus preventing the battery from short-circuiting.

[0041] Specifically, refer to Figure 5 As shown, the sealing element 16 includes a first sealing portion 161 and a second sealing portion 162. The first sealing portion 161 is disposed between the connection between the first connecting portion 131 and the second connecting portion 132 and the top cover plate 11, and the first sealing portion 161 is used for insulation between the connection between the first connecting portion 131 and the second connecting portion 132 and the top cover plate 11. The second sealing portion 162 is connected to the first sealing portion 161 and is disposed between the inner wall of the first connecting hole 111 and the pole post 12, and the second sealing portion 162 is used for insulation between the inner wall of the first connecting hole 111 and the pole post 12.

[0042] Thus, by setting the first sealing part 161, the connection between the first connecting part 131 and the second connecting part 132 and the top cover plate 11 can be sealed, which can ensure that the copper and aluminum interface of the connector 13 is isolated, that is, ensure that the copper and aluminum interface of the connector 13 will not form a conductive circuit in the electrolyte environment, thus preventing the battery from short-circuiting.

[0043] Thus, by providing the second sealing part 162, insulation between the terminal post 12 and the top cover plate 11 can be guaranteed, preventing the terminal post 12 and the top cover plate 11 from coming into contact and causing a short circuit in the battery.

[0044] In some embodiments, the thickness of the second connecting portion 132 is less than the thickness of the first connecting portion 131.

[0045] It is understood that in this embodiment, the welding area of ​​the connector 13 and the pole post 12 is located on the second connecting part 132. Therefore, by setting the thickness of the second connecting part 132 to be less than the thickness of the first connecting part 131, the welding area can be quickly positioned, thereby improving the welding efficiency between the pole post 12 and the connector 13. Furthermore, since the thickness of the second connecting part 132 is less than that of the first connecting part 131, the first connecting part 131 is prone to warping during the welding process between the pole post 12 and the connector 13. Therefore, by setting the fastener 14, the connection strength between the first connecting part 131 and the top cover plate 11 can be increased, thereby preventing the first connecting part 131 from warping during the welding process between the pole post 12 and the connector 13, thus ensuring the surface flatness of the connector 13 and the welding quality between the connector 13 and the first component.

[0046] In some embodiments, the outer periphery of the connector 13 is provided with a limiting protrusion 133, and the connector 13 is partially located between the fixing member 14 and the top cover plate 11.

[0047] In other words, in this embodiment, along the thickness direction of the top cover plate 11, the limiting protrusion 133 and the top cover plate 11, as well as the limiting protrusion 133 and the plastic part 15, all have portions that overlap in orthographic projection. This enhances the connection between the terminal post 12, the plastic part 15, and the top cover plate 11. It can prevent the two sides of the connector 13 from lifting up during the welding process between the connector 13 and the terminal post 12, thus preventing unevenness on the surface of the connector 13 and ensuring the connection between the connector 13 and the first component. At the same time, it can also prevent the connector 13 from shifting in the thickness direction of the top cover plate 11, thereby avoiding gaps inside the top cover assembly 1 that could lead to battery sealing failure.

[0048] In some embodiments, the fastener 14 includes a first fastening portion 141, a second fastening portion 142, and a third fastening portion 143. The first fastening portion 141 is connected to the top cover plate 11; the second fastening portion 142 is connected to the first fastening portion 141 and is bent toward the side away from the top cover plate 11; and the third fastening portion 143 is connected to the end of the second fastening portion 142 away from the first fastening portion 141, such that the connector 13 is partially located between the third portion and the top cover plate 11.

[0049] Thus, in this embodiment, dividing the fastener 14 into three bent parts increases the contact area between the fastener 14 and the plastic part 15, thereby increasing the connection strength between the fastener 14 and the plastic part 15, and thus ensuring the connection between the top cover 11 and the connector 13.

[0050] In some embodiments, the plastic part 15 is wrapped around the second fixing part 142 and the third fixing part 143.

[0051] In this way, the plastic part 15 and the fixing member 14 can have a larger contact area, that is, the fixing member 14 extends into the interior of the plastic part 15, thereby better ensuring the connection strength between the plastic part 15 and the fixing member 14.

[0052] In some embodiments, the top cover 11 has a recess 112 on the side opposite to the battery cell, and at least a portion of the fastener 14 is disposed in the recess 112.

[0053] Thus, the top cover 11 has a recess 112 on the side away from the battery cell, so that part of the fixing member 14 can be accommodated in the recess 112, thereby avoiding the excessive thickness of the top cover assembly 1 due to the setting of the fixing member 14 and reducing the overall weight of the battery.

[0054] In some embodiments, the bottom wall of the recess 112 and the connector 13 are spaced apart, such that at least a portion of the plastic part 15 is sandwiched between the recess 112 and the connector 13.

[0055] This results in a large contact area between the plastic part 15 and the top cover plate 11, as well as between the plastic part 15 and the connector 13. Furthermore, the plastic part 15 is connected to the fixing member 14, thus ensuring a tight connection between the fixing member 14, the plastic part 15, the connector 13, and the top cover plate 11, preventing the connector 13 from warping or undergoing axial displacement.

[0056] In some embodiments, the electrode post 12 includes a first electrode post portion 121 and a second electrode post portion 122. The first electrode post portion 121 is connected to the second connecting portion 132. The second electrode post portion 122 is connected to the side of the first electrode post portion 121 facing the battery cell. The second electrode post portion 122 extends along the length direction of the top cover plate 11 and is used to connect to the battery cell.

[0057] Thus, by setting the second terminal portion 122 to extend along the length direction of the top cover plate 11, when the terminal 12 is connected to the connector 13, the whole is in the shape of "I". Therefore, the connection between the top cover plate 11, the connector 13 and the terminal 12 can be better guaranteed, and the connection between the connector 13 and the terminal 12 can be avoided, thus preventing the seal ring from failing due to displacement of the connector 13 and ensuring the normal performance of the battery.

[0058] In some embodiments, the top cover assembly 1 further includes an insulating member 17, which is disposed between the side of the top cover sheet 11 facing the battery cell and the second terminal portion 122. The insulating member 17 is used for insulation between the side of the top cover sheet 11 facing the battery cell and the second terminal portion 122. Thus, by providing the insulating component 17, insulation between the second insulating part and the top cover plate 11 can be guaranteed. At the same time, the insulating component 17 can also prevent the electrode tab from directly contacting the top cover plate 11, thus preventing the battery from short-circuiting.

[0059] In summary, in the embodiments of this application, the connection between the top cover 11 and the connector 13 is enhanced by the setting of the fixing member 14. Thus, when the connector 13 is welded to the terminal post 12, the two sides of the connector 13 are prevented from warping up, which would cause the surface of the connector 13 to be uneven. Furthermore, the fixing member 14 is prevented from shifting, which would cause the internal insulating member 17 or the sealing member 16 to fail due to insufficient compression, thus avoiding any impact on the internal airtightness of the battery and ensuring the normal use of the battery.

[0060] It should also be noted that, in this embodiment, the top cover assembly 1 is assembled as follows: (1) The connector 13 and the fastener 14 are integrally coated with plastic, wherein the coated body forms a plastic part 15 for connecting the fastener 14 and the connector 13; (2) Connect the sealing element 16 to the top cover plate 11; (3) Weld the fastener 14 to the top cover plate 11; (4) The insulating part 17 is fixedly connected to the top cover piece 11. The connection method can be adhesive bonding, heat fusion bonding, or snap-fit ​​bonding. (5) Weld the pole post 12 to the pole lug, and then weld the pole post 12 to the connector 13.

[0061] It is understood that in this embodiment, the electrode post 12 is first welded to the electrode tab, and then the electrode post 12 is welded to the connector 13. This can further avoid pulling on the electrode post 12 when welding it to the electrode tab, thereby avoiding the phenomenon of movement or lifting of the connector 13, and further ensuring the surface flatness of the connector 13.

[0062] According to a second aspect of this disclosure, a battery is provided, which includes a housing, a battery cell, and the aforementioned top cover assembly 1. The housing includes a receiving cavity and an opening, the battery cell is disposed in the receiving cavity, and the top cover assembly 1 is disposed in the receiving cavity to close the opening.

[0063] The battery has all the beneficial effects of the aforementioned top cover assembly 1, which will not be repeated here.

[0064] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a battery case for encapsulating one or more battery cells. The battery case can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0065] The battery cell mentioned in the embodiments of this application may include an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The battery cell mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The positive electrode includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area. The positive electrode coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0066] Currently, batteries are being used more and more widely. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0067] The battery described in the embodiments of this application is used in electrical devices.

[0068] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0069] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0070] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0071] It should be noted that in this application, "and / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the related objects before and after it are in an "or" relationship.

[0072] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0074] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A top cover assembly, characterized in that, include: Top cover plate (11), the top cover plate (11) is provided with a first connecting hole (111); The pole (12) is inserted through the first connecting hole (111). Connector (13), the connector (13) is connected to the side of the top cover plate (11) away from the battery cell, the connector (13) is used to connect the first component; A fastener (14) surrounds the outer periphery of the connector (13) and is connected to the top cover plate (11); and, A plastic part (15) is at least partially disposed between the connector (13) and the fixing member (14) so ​​that the fixing member (14) and the connector (13) are connected and fixed by the plastic part (15).

2. The top cover assembly according to claim 1, characterized in that, The top cover assembly (1) further includes a seal (16), at least a portion of which is disposed between the connector (13) and the top cover piece (11), the seal (16) being used for sealing between the connector (13) and the top cover piece (11).

3. The top cover assembly according to claim 2, characterized in that, The connector (13) includes: A first connecting portion (131) is connected to the plastic part (15), and a second connecting hole is provided on the first connecting portion (131); and, The second connecting part (132) is disposed in the second connecting hole and is connected to the pole post (12); The second connecting part (132) is made of the same material as the pole post (12).

4. The top cover assembly according to claim 3, characterized in that, Part of the seal (16) abuts against both the first connecting part (131) and the second connecting part (132).

5. The top cover assembly according to claim 3, characterized in that, The thickness of the second connecting part (132) is less than the thickness of the first connecting part (131).

6. The top cover assembly according to claim 1, characterized in that, The connector (13) has a limiting protrusion (133) on its outer periphery, and part of the connector (13) is located between the fixing member (14) and the top cover plate (11).

7. The top cover assembly according to any one of claims 1-6, characterized in that, The fastener (14) includes: The first fixing part (141) is connected to the top cover plate (11); A second fixing part (142) is connected to the first fixing part (141), and the second fixing part (142) is bent toward the side away from the top cover plate (11); and, The third fixing part (143) is connected to the end of the second fixing part (142) away from the first fixing part (141) so that the connector (13) is located between the third part and the top cover plate (11).

8. The top cover assembly according to claim 7, characterized in that, The plastic part (15) is wrapped around the second fixing part (142) and the third fixing part (143).

9. The top cover assembly according to any one of claims 1-6, characterized in that, The top cover (11) has a recess (112) on the side opposite to the battery cell, and at least part of the fixing member (14) is disposed in the recess (112).

10. The top cover assembly according to claim 8, characterized in that, The bottom wall of the recess (112) is spaced apart from the connector (13) so that at least a portion of the plastic part (15) is sandwiched between the recess (112) and the connector (13).

11. The top cover assembly according to any one of claims 3-6, characterized in that, The pole (12) includes: The first pole post (121) is connected to the second connecting part (132); The second pole piece (122) is connected to the side of the first pole piece (121) facing the battery cell. The second pole piece (122) extends along the length direction of the top cover plate (11) and is used to connect with the battery cell.

12. The top cover assembly according to claim 11, characterized in that, The top cover assembly (1) further includes an insulating member (17), which is disposed between the side of the top cover sheet (11) facing the battery cell and the second pole piece (122). The insulating member (17) is used for insulation between the side of the top cover sheet (11) facing the battery cell and the second pole piece (122).

13. A battery, characterized in that, include: A housing, the housing including a receiving cavity and an opening; The battery cell is disposed in the accommodating cavity; and, The top cover assembly (1) as described in any one of claims 1-9, wherein the top cover assembly (1) is disposed in the receiving cavity to close the opening.

Images