Top cover structure of battery and battery

Abstract

The utility model relates to a top cover structure of a battery and the battery. The top cover structure comprises a lower plastic part, the bottom surface of the lower plastic part is provided with a limiting groove, and the limiting groove is used for accommodating a roll core switching piece of the battery so as to limit the roll core switching piece of the battery in the length direction and the width direction of the lower plastic part. According to the top cover structure of the battery, the limiting groove is formed in the bottom surface of the lower plastic part and can be used for limiting the roll core switching piece of the battery in the length direction and the width direction of the lower plastic part, the roll core switching piece can be kept positioned when the roll core switching piece is welded with a pole, and the roll core switching piece is prevented from being damaged when the roll core is positioned. According to the utility model, the roll core switching piece can be still in a specified position, the defect of flexible connection with the tab is avoided, meanwhile, normal assembly of the roll core is not interfered, and the welding quality and the battery performance are ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery top cover structure and a battery. Background Art

[0002] Currently, the new energy industry is developing rapidly, the ownership of new energy vehicles is gradually increasing, and the demand for new energy batteries is also rising. With the continuous improvement of battery technology, the requirements for battery capacity and energy density are also increasing.

[0003] Traditional batteries typically consist of a winding core, a top cover, and a housing. The top cover is mounted on the housing to enclose the winding core 20. During battery manufacturing, ultrasonic welding is first used to connect the winding core's tabs to the adapter plate. The adapter plate is then welded to the top cover to complete the circuit path. When welding the adapter plate to the top cover, a clamping block is typically used to position the winding core to prevent the adapter plate from shifting during welding.

[0004] However, since the tabs of the core are made of copper foil and aluminum foil stacked together, the connection between the tabs of the core and the adapter is soft. Therefore, when welding the adapter, although the core is positioned, the adapter is still prone to position displacement, which affects the welding quality and battery performance. In severe cases, the tabs may tear after the core is closed, posing a safety risk. Utility Model Content

[0005] Based on this, it is necessary to provide a battery top cover structure and a battery to address the problem that the adapter plate is still offset after the core is positioned due to the soft connection between the pole ear of the core and the adapter plate, which poses a safety risk.

[0006] A top cover structure of a battery includes a lower plastic part, wherein a limiting groove is provided on the bottom surface of the lower plastic part, and the limiting groove is used to accommodate the winding core adapter piece of the battery to limit the winding core adapter piece of the battery in the length direction and width direction of the lower plastic part.

[0007] In one embodiment, the bottom surface of the lower plastic part is further provided with a limiting rib, and the limiting rib is arranged in a ring to form the limiting groove.

[0008] In one embodiment, the limiting ribs are intermittently arranged along the direction of the limiting groove.

[0009] In one embodiment, the limiting rib is also connected to the side wall of the lower plastic part.

[0010] In one embodiment, the notch of the limiting groove is chamfered.

[0011] In one embodiment, the chamfer is a rounded corner or a beveled corner.

[0012] In one embodiment, the depth of the limiting groove is greater than the thickness of the winding core adapter sheet.

[0013] In one embodiment, the bottom surface of the lower plastic part is further provided with a reinforcing rib, and the reinforcing rib is located in the limiting groove.

[0014] In one embodiment, the top cover structure further includes a pole, a substrate and an upper plastic part, the substrate is stacked on the top surface of the lower plastic part, the pole extends from the substrate from the bottom surface of the lower plastic part, and the upper plastic part is injection molded as one piece with the substrate and the pole.

[0015] The top cover structure of the above-mentioned battery is provided with a limiting groove on the bottom surface of the lower plastic part. The limiting groove can be used to limit the battery core adapter plate in the length and width directions of the lower plastic part. The core adapter plate can be positioned when it is welded to the pole. When positioning the core, the core adapter plate can remain in the specified position, avoiding the disadvantages of soft connection with the pole ear, and will not interfere with the normal assembly of the core, thereby ensuring the welding quality and battery performance.

[0016] A battery comprising a winding core, a winding core adapter sheet, and a top cover structure as described in any one of the above items;

[0017] The winding cores are provided in a plurality and are sequentially connected in series;

[0018] The core adapter is used to connect the core connected in series at the first position with the core connected in series at the last position, and is fixed in the limiting groove of the lower plastic part.

[0019] The above-mentioned battery is provided with a limiting groove on the lower plastic part of the top cover structure, and the limiting groove can be used to limit the battery core adapter plate in the length and width directions of the lower plastic part. The positioning of the core adapter plate can be maintained when the core adapter plate is welded to the pole. When positioning the core, the core adapter plate can remain in the specified position, avoiding the disadvantages of soft connection with the pole ear, and at the same time will not interfere with the normal assembly of the core, thereby ensuring the welding quality and battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of the preparation of a battery provided in one embodiment of the present application.

[0021] Figure 2 A schematic structural diagram of the top cover structure of a battery provided in one embodiment of the present application as viewed from a first angle.

[0022] Figure 3 A schematic structural diagram of the top cover structure of a battery provided in one embodiment of the present application as viewed from a second angle.

[0023] Figure 4 for Figure 2 Exploded diagram of the roof structure provided.

[0024] Figure 5 This is a schematic diagram of the structure of a battery provided in one embodiment of the present application. It should be noted that in order to more clearly show the structure of the battery, Figure 5 The core in the roll is not closed.

[0025] Figure 6 for Figure 3 A local enlarged schematic diagram at point A.

[0026] The reference numerals in the accompanying drawings are described as follows:

[0027] 10. Top cover structure; 100. Lower plastic part; 110. Limiting groove; 120. Limiting rib; 130. Chamfer; 140. Reinforcement rib; 150. Second mounting hole; 160. Lower plastic plate; 170. Explosion-proof cavity; 200. Base plate; 210. First mounting hole; 220. Knurled boss; 230. Explosion-proof port; 300. Pole; 310. Bottom plate; 320. Sealing ring; 400. Upper plastic part; 500. Explosion-proof valve; 510. Protective patch; 520. Aluminum sheet; 20. Winding core; 20a. Tab; 30. Winding core adapter. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0034] As the core component of new energy vehicles, batteries provide a source of power for new energy vehicles. Their performance directly affects the mileage, safety and overall user experience of new energy vehicles. The battery consists of a core, a top cover and a shell. The top cover is installed on the shell to encapsulate the core in the shell. The battery manufacturing process is as follows: Figure 1As shown, the core is first hot-pressed, and then the core's tabs are ultrasonically welded to the core transfer sheet. The core transfer sheet is then laser-welded to the top cover to achieve circuit access. The core is then wrapped with Mylar (polyester film) and placed in a shell. Finally, the top cover is welded to the shell.

[0035] When welding the adapter to the top cover, a clamping block is typically used to position the core to prevent the adapter from shifting (e.g., rotating or translating) during welding. However, because the tabs of the core are made of a laminate of copper and aluminum foil, the connection between the tabs and the core adapter is flexible. Therefore, even though the core is positioned, the tabs are still susceptible to shifting during welding. This affects welding quality and battery performance, and in severe cases can lead to the tabs tearing after the core is assembled, posing a safety risk.

[0036] To this end, one embodiment of the present application provides a top cover structure 10 that can be applied to a battery. Specifically, the top cover structure 10 can be installed on the top of the battery casing to encapsulate the coil core within the battery casing. The battery can be a lithium battery, or other batteries, such as a lithium cobalt oxide battery or a nickel-metal hydride battery. The battery can be a prismatic battery, or other shapes.

[0037] like Figures 2 to 4 As shown, the top cover structure 10 includes a substrate 200, a terminal 300, an upper plastic part 400 and a lower plastic part 100. The substrate 200 serves as a supporting component of the entire top cover structure 10 and is mounted on the top of the battery housing to encapsulate the winding core 20 in the battery housing. Figure 4 As shown, the substrate 200 has a first mounting hole 210 for the pole 300 to pass through. The first mounting hole 210 passes through the top surface and the bottom surface of the substrate 200 along the thickness direction of the substrate 200.

[0038] The pole 300 extends from the first mounting hole 210 and is used to connect with the terminal to connect the winding core 20 to the external circuit. Figure 2 and Figure 4 There are two poles 300, one of which is a positive pole 300 and the other is a negative pole 300. Correspondingly, two first mounting holes 210 are provided on the substrate 200, one of which is used for the positive pole 300 to pass through, and the other is used for the negative pole 300 to pass through.

[0039] The upper plastic part 400 is integrally molded with the substrate 200 and the pole 300, so that a seal can be provided above the pole 300 to prevent external impurities from entering the battery. Figure 4As shown, a sealing ring 320 is provided on the outer circumference of the electrode 300. The sealing ring 320 is used to seal the gap between the electrode 300 and the substrate 200. The sealing ring 320 further ensures the airtightness of the battery. The number of upper plastic parts 400 can be set to two, one of which seals above the positive electrode 300 and the other seals above the negative electrode 300.

[0040] Alternatively, as Figure 4 As shown, a knurled boss 220 is provided on the top surface of the base plate 200 and is located on the outer periphery of the first mounting hole 210. The upper molded part 400 is integrally injection-molded with the knurled boss 220, the base plate 200, and the terminal 300. The knurled boss 220 is provided with multiple knurled teeth along its circumference, which increases the contact area between the upper molded part 400 and the base plate 200, ensuring a tight connection between the upper molded part 400 and the base plate 200, thereby providing the terminal 300 with a certain degree of pressure and torsion resistance.

[0041] The lower plastic part 100 is mainly used to separate the substrate 200 and the winding core 20 to play an insulating role between the substrate 200 and the winding core 20. The substrate 200 is stacked on the top surface of the lower plastic part 100, and the pole 300 extends from the bottom surface of the lower plastic part 100. Optionally, the pole 300 pushes the lower plastic part 100 to make it close to the bottom surface of the substrate 200. As an example, Figure 4 As shown, a bottom plate 310 is provided at the bottom of the pole 300 , and the bottom plate 310 is used to push the lower plastic part 100 .

[0042] Among them, Figure 4 As shown, the lower plastic part 100 is also provided with a second mounting hole 150 for the electrode 300 to pass through. The second mounting hole 150 passes through the top and bottom surfaces of the lower plastic part 100 along the thickness direction of the lower plastic part 100. It is understood that two second mounting holes 150 are also provided, one second mounting hole 150 is used for the positive electrode 300 to pass through, and the other second mounting hole 150 is used for the negative electrode 300 to pass through.

[0043] like Figure 3 As shown, the bottom surface of the lower plastic part 100 is provided with a limiting groove 110, which is used to accommodate the battery core adapter 30 to limit the battery core adapter 30 in the length direction and width direction of the lower plastic part 100. Figure 3 The direction of the "X axis" is the width direction of the lower plastic part 100. Figure 3 Optionally, the lower plastic part 100 can be made of a high-strength material such as PP (Polypropylene).

[0044] After the tab 20a of the winding core 20 is ultrasonically welded to the winding core transfer sheet 30, Figure 5 As shown, the core adapter plate 30 is placed in the limiting groove 110 on the bottom surface of the lower plastic part 100. The limiting groove 110 can limit the core adapter plate 30 of the battery in the length direction and width direction of the lower plastic part 100, so that the core adapter plate 30 can maintain its position unchanged during laser welding with the bottom plate 310 of the pole 300, avoiding position displacement such as rotation and translation, ensuring welding quality and battery performance, and especially avoiding the occurrence of tearing of the pole ear 20a after the core 20 is closed, thereby ensuring electrical safety performance.

[0045] It is understood that the shape and size of the limiting groove 110 should be compatible with the core transfer piece 30, and can limit the core transfer piece 30 in the length and width directions of the lower plastic part 100. For example, if the core transfer piece 30 is a regular square structure, the limiting groove 110 is also set as a square groove that matches it; if the core transfer piece 30 is a regular circular structure, the limiting groove 110 is also set as a circular groove that matches it; if the core 20 connecting piece is Figure 5 The irregular structure shown in FIG. 1 is an irregular structure, and the limiting groove 110 is also set to be an irregular groove matching therewith.

[0046] The lower plastic part 100 is provided with two retaining grooves 110, one of which is used to accommodate the core adapter 30 connected to the positive electrode 300, and the other of which is used to accommodate the core adapter 30 connected to the negative electrode 300. It is understood that multiple cores 20 are provided and connected in series, with the first core 20 in the series being welded to the last core 20 via two core adapters 30.

[0047] Alternatively, as Figure 3 As shown, the lower plastic part 100 is formed by connecting two lower plastic plates 160 , and a limiting groove 110 is provided on the bottom surface of each lower plastic plate 160 .

[0048] It can be seen that the top cover structure 10 of the battery is provided with a limiting groove 110 on the bottom surface of the lower plastic part 100. The limiting groove 110 can be used to limit the battery core adapter 30 in the length and width directions of the lower plastic part 100. The core adapter 30 can be kept in position when it is welded to the pole 300. When positioning the core 20, the core adapter 30 can remain in the specified position, avoiding the disadvantage of soft connection with the pole ear 20a, and will not interfere with the normal assembly of the core 20, thereby ensuring the welding quality and battery performance.

[0049] like Figure 6As shown, in some embodiments of the present application, the bottom surface of the lower plastic part 100 is further provided with a limiting rib 120, which is arranged around a limiting groove 110. The use of the limiting rib 120 to form the limiting groove 110 can also increase the strength of the lower plastic part 100, making the overall structure of the lower plastic part 100 more stable.

[0050] Optionally, the limiting rib 120 is integrally injection-molded with the lower plastic part 100. In this way, a tight connection between the limiting rib 120 and the lower plastic part 100 can be ensured.

[0051] Continue to see Figure 6 The limiting ribs 120 can be intermittently arranged along the direction of the limiting groove 110. This not only facilitates the formation of the limiting ribs 120 on the lower plastic part 100, but also reduces the weight of the lower plastic part 100. Of course, in other embodiments, the limiting ribs 120 can also be arranged in a circle along the circumference of the limiting groove 110.

[0052] It is understood that the limiting rib 120 can be divided into a plurality of limiting portions along the direction of the corresponding limiting groove 110, wherein the limiting portions are provided on both sides of the width direction and both sides of the length direction of the corresponding lower plastic plate 160. The number of limiting portions on both sides of the width direction of the corresponding lower plastic plate 160 and the number on both sides of the length direction of the corresponding lower plastic plate 160 can be set accordingly according to needs. For example, three limiting portions can be provided on each side of the width direction of the corresponding lower plastic plate 160, and four and five limiting portions can be provided on each side of the length direction of the corresponding lower plastic plate 160, respectively.

[0053] Continue to see Figure 6 The limiting ribs 120 are also connected to the side walls of the lower plastic part 100. Connecting the limiting ribs 120 to the side walls of the lower plastic part 100 can further improve the connection strength between the limiting ribs 120 and the lower plastic part 100, thereby ensuring the limiting effect of the limiting ribs 120 on the winding core adapter 30 and effectively improving the overall strength of the lower plastic part 100.

[0054] Optionally, the limiting portions located on both sides of the width direction of the lower plastic plate 160 are in a straight line shape and are connected to the side walls on both sides of the width direction of the lower plastic plate 160; the limiting portions located on both sides of the length direction of the lower plastic plate 160 are in a straight line shape and are connected to the side walls on both sides of the length direction of the lower plastic plate 160.

[0055] like Figure 6 As shown, in some embodiments of the present application, the notch of the limiting groove 110 is provided with a chamfer 130. The chamfer 130 can guide the installation of the core adapter 30. By utilizing the quick installation of the core adapter 30 in the limiting groove 110, the core adapter 30 can be smoothly introduced into the limiting groove 110 even if the initial position deviation between the core adapter 30 and the limiting groove 110 is large.

[0056] Optionally, the chamfer 130 is a rounded corner or an oblique angle, that is, an inclined surface or an arc surface is provided on the side wall of the limiting rib 120 .

[0057] In some embodiments of the present application, the depth of the limiting groove 110 is greater than the thickness of the core transfer piece 30. This dimension relationship between the limiting groove 110 and the core transfer piece 30 ensures that the core transfer piece 30 does not protrude from the limiting groove 110 after being installed in the limiting groove 110. This ensures that the limiting groove 110 effectively positions the core transfer piece 30 and prevents the core transfer piece 30 from interfering with the core 20 after the core 20 is closed.

[0058] Optionally, the bottom surface of the limiting rib 120 is flush with the bottom surface of the lower plastic part 100. In this way, the positioning effect of the limiting rib 120 on the core transfer piece 30 can be ensured, and the core transfer piece 30 can be prevented from interfering with the core 20 after the core 20 is closed.

[0059] Continue to see Figure 6 In some embodiments of the present application, the bottom surface of the lower plastic part 100 is further provided with a reinforcing rib 140, which is located in the limiting groove 110. The reinforcing rib 140 not only further increases the strength of the lower plastic part 100, thereby making the overall structure of the lower plastic part 100 more stable, but also raises the core transfer plate 30 so that the core transfer plate 30 can be flush with the bottom plate 310 of the pole 300, facilitating welding of the core transfer plate 30 to the bottom plate 310 of the pole 300.

[0060] Optionally, the reinforcing rib 140 can be integrally injection-molded with the lower plastic part 100. In this way, the reinforcing rib 140 can be tightly connected to the lower plastic part 100.

[0061] Optionally, the reinforcing ribs 140 are further connected to the limiting ribs 120. In this way, the strength of the lower plastic part 100 can be further increased, so that the overall structure of the lower plastic part 100 is more stable.

[0062] like Figure 4 As shown, in some embodiments, the base plate 200 has an explosion-proof opening 230, and the lower plastic part 100 has an explosion-proof cavity 170 corresponding to the explosion-proof opening 230 and sunken; Figure 2 As shown, the battery top cover structure 10 further includes an explosion-proof valve 500, which is disposed at the explosion-proof opening 230. The explosion-proof valve 500 can be used for circuit breaker protection or pressure relief protection. For example, when the internal pressure of the battery increases and exceeds the opening pressure of the explosion-proof valve 500, the explosion-proof valve 500 opens to relieve pressure.

[0063] Alternatively, as Figure 4As shown, the explosion-proof valve 500 includes a protective patch 510 and an aluminum sheet 520 stacked from top to bottom. The aluminum sheet 520 can withstand pressure. The protective patch 510 can preferably be made of PET material. The protective patch 510 is tough and will first swell when impacted and finally release pressure.

[0064] Optionally, the explosion-proof opening 230 is disposed in the middle of the two first mounting holes 210 , and the explosion-proof cavity 170 is disposed in the middle of the two second mounting holes 150 .

[0065] On the other hand, Figure 5 As shown, an embodiment of the present application also provides a battery, which includes a core 20, a core adapter plate 30 and a top cover structure 10 as described in any one of the above items; the core 20 is provided in multiple numbers and connected in series in sequence; the core adapter plate 30 is used to connect the core 20 connected in series at the first position with the core 20 connected in series at the last position, and is fixed in the limiting groove 110 of the lower plastic part 100.

[0066] The battery can be a lithium battery, a lithium cobalt oxide battery, a nickel-metal hydride battery, or other batteries, and can be applied to electric vehicles (such as heavy trucks and mining trucks), energy storage systems, and other fields. The battery can be a prismatic battery, or of course, other shapes.

[0067] This battery is provided with a limiting groove 110 on the lower plastic part 100 of the top cover structure 10. The limiting groove 110 can be used to limit the battery core adapter 30 in the length and width directions of the lower plastic part 100. The core adapter 30 can be kept in position when it is welded to the pole 300. When positioning the core 20, the core adapter 30 can remain in the specified position, avoiding the disadvantage of soft connection with the pole ear 20a, and will not interfere with the normal assembly of the core 20, thereby ensuring the welding quality and battery performance.

[0068] like Figure 1 As shown, in some embodiments of the present application, the number of cores 20 is set to two, and these two cores 20 are adjacent to each other via two side-by-side core adapters 30, one of which is welded to the positive electrode post 300, and the other is welded to the negative electrode post 300. This structure of the battery is easy to manufacture. Of course, in some other embodiments, the number of cores 20 is set to four, and the core 20 connected in series at the first position is connected in series with the core 20 connected in series at the last position. This structure of the battery can provide higher power and energy storage capacity.

[0069] In some embodiments of the present application, the battery further includes a housing (not shown in the drawings), and the base plate 200 of the top cover structure 10 is mounted on the housing. Optionally, the base plate 200 is connected to the housing by welding.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery top cover structure, characterized in that: It includes a lower plastic part, and a limiting groove is provided on the bottom surface of the lower plastic part. The limiting groove is used to accommodate the winding core adapter piece of the battery to limit the winding core adapter piece of the battery in the length direction and width direction of the lower plastic part.

2. The top cover structure according to claim 1, characterized in that: The bottom surface of the lower plastic part is further provided with a limiting rib, and the limiting rib is arranged in a circular manner to form the limiting groove.

3. The top cover structure according to claim 2, characterized in that: The limiting ribs are intermittently arranged along the direction of the limiting grooves.

4. The top cover structure according to claim 2, characterized in that: The limiting ribs are also connected to the side walls of the lower plastic part.

5. The top cover structure according to claim 1, characterized in that: The notch of the limiting groove is provided with a chamfer.

6. The top cover structure according to claim 5, characterized in that: The chamfer is a rounded corner or a beveled corner.

7. The top cover structure according to claim 1, characterized in that: The depth of the limiting groove is greater than the thickness of the winding core adapter sheet.

8. The top cover structure according to claim 1, characterized in that: The bottom surface of the lower plastic part is further provided with a reinforcing rib, and the reinforcing rib is located in the limiting groove.

9. The roof structure according to any one of claims 1 to 8, characterized in that: The top cover structure also includes a pole, a base plate and an upper plastic part. The base plate is stacked on the top surface of the lower plastic part. The pole extends from the base plate from the bottom surface of the lower plastic part. The upper plastic part is injection-molded as one piece with the base plate and the pole.

10. A battery, characterized in that: The battery comprises a winding core, a winding core adapter sheet, and a top cover structure according to any one of claims 1 to 9; The winding cores are provided in a plurality and are sequentially connected in series; The core adapter is used to connect the core connected in series at the first position with the core connected in series at the last position, and is fixed in the limiting groove of the lower plastic part.

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