Battery top cover structure and battery

Abstract

The utility model discloses a kind of battery top cover structure and battery, belong to battery technical field, including top cover sheet, positive pole post and negative pole post respectively through being equipped in top cover sheet, the positive pole upper plastic that is combined with the upper surface of top cover sheet and is sleeved in the outer periphery of positive pole post, and the negative pole upper plastic that is combined with the upper surface of top cover sheet and is sleeved in the outer periphery of negative pole post;Positive pole post includes first cylinder, first cooperation part and the first bottom plate respectively connected with first cylinder and first cooperation part, first cylinder and first cooperation part are arranged with interval, and positive pole heat insulation groove is arranged between first cylinder and first cooperation part;Negative pole post includes second cylinder, second cooperation part and the second bottom plate respectively connected with second cylinder and second cooperation part, second cylinder and second cooperation part are arranged with interval, and negative pole heat insulation groove is arranged between second cylinder and second cooperation part.The utility model reaches the technical effect of being capable of improving the sealing property of battery, improving security and stability when pole high temperature.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery top cover structure and a battery. Background Technology

[0002] Batteries, as a crucial energy storage device, are widely used in electric vehicles, home energy storage systems, portable electronic devices, and digital products. The battery top cover, as a vital component, not only seals and protects the internal structure of the battery but also plays a crucial role in the battery's current carrying capacity, safety performance, and overall reliability. In existing technologies, the positive and negative terminals on the battery top cover are key components connecting the internal current collector to the external circuitry. A typical structure uses injection-molded overmolded terminals, where a sealing ring is compressed and then secured with plastic overmolding to achieve a seal at the terminal positions. The positive and negative terminals are then fixedly connected to the top cover and other components through injection molding to form a complete battery top cover structure. However, plastic materials have relatively poor high-temperature resistance. When busbars are welded onto the terminals to connect to the external circuitry, the high temperatures generated during welding can easily be transferred through the terminals to the overmolded plastic. This high temperature can cause the overmolded plastic to soften or even melt, triggering the sealing ring to rebound and affecting the sealing performance at the terminal positions. Meanwhile, when the battery experiences overcurrent during operation, the terminal itself will heat up due to excessive current, which will also transfer the high temperature to the upper plastic, causing the upper plastic to soften, loosening the sealing ring, and reducing the battery's sealing performance and reliability.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the battery is prone to sealing failure when the electrode is at high temperature, which reduces safety and stability.

[0005] To solve the above-mentioned technical problems, this utility model provides a battery top cover structure, which includes a top cover sheet, a positive electrode post and a negative electrode post respectively passing through the top cover sheet, a positive electrode plastic sleeved on the outer periphery of the positive electrode post and combined with the upper surface of the top cover sheet, and a negative electrode plastic sleeved on the outer periphery of the negative electrode post and combined with the upper surface of the top cover sheet; wherein, the positive electrode post includes a first column, a first mating part, and a first base plate respectively connected to the first column and the first mating part, the first column and the first mating part are arranged at intervals, a positive electrode heat insulation groove is provided between the first column and the first mating part, and the positive electrode plastic sleeve is connected to the first mating part; the negative electrode post includes a second column, a second mating part, and a second base plate respectively connected to the second column and the second mating part, the second column and the second mating part are arranged at intervals, a negative electrode heat insulation groove is provided between the second column and the second mating part, and the negative electrode plastic sleeve is connected to the second mating part.

[0006] Optionally, when viewed along the plastic on the positive electrode towards the top cover plate, the distance between the bottom of the positive electrode heat insulation groove and the first base plate is less than the distance between the bottom of the plastic on the positive electrode and the first base plate; and the distance between the top of the first column and the top cover plate is greater than the distance between the plastic on the positive electrode and the top cover plate; when viewed along the first column towards the first mating part, the width of the positive electrode heat insulation groove is greater than 0 mm.

[0007] Optionally, when viewed along the plastic on the negative electrode towards the top cover plate, the distance between the bottom of the negative electrode heat insulation groove and the first base plate is less than the distance between the bottom of the plastic on the negative electrode and the first base plate; and the distance between the top of the first column and the top cover plate is greater than the distance between the plastic on the negative electrode and the top cover plate; when viewed along the first column towards the first mating part, the width of the negative electrode heat insulation groove is greater than 0 mm.

[0008] Optionally, both the positive electrode heat insulation groove and the negative electrode heat insulation groove are annular grooves.

[0009] Optionally, the central axis of the positive electrode heat insulation groove is parallel to the central axis of the first column; the central axis of the negative electrode heat insulation groove is parallel to the central axis of the second column.

[0010] Optionally, the first mating part is provided with a positive limit groove that matches the plastic on the positive electrode, and the plastic on the positive electrode is at least partially embedded in the positive limit groove; the second mating part is provided with a negative limit groove that matches the plastic on the negative electrode, and the plastic on the negative electrode is at least partially embedded in the negative limit groove.

[0011] Optionally, the battery top cover structure further includes a positive electrode sealing ring sleeved on the outer periphery of the first mating part and located between the positive electrode plastic and the top cover sheet; and a negative electrode sealing ring sleeved on the outer periphery of the second mating part and located between the negative electrode plastic and the top cover sheet.

[0012] Optionally, the battery top cover structure further includes a lower plastic with a positive electrode mounting hole and a negative electrode mounting hole, wherein the first column and the first mating part respectively pass through the positive electrode mounting hole and are connected to the first base plate, and the second column and the second mating part respectively pass through the negative electrode mounting hole and are connected to the second base plate.

[0013] Optionally, the top cover is provided with a through groove, which is located between the positive electrode mounting hole and the negative electrode mounting hole; the lower plastic is also provided with a hollow groove facing the through groove; the battery top cover structure also includes an explosion-proof valve and a protective patch, the explosion-proof valve is located between the through groove and the hollow groove, and the protective patch is located in the through groove.

[0014] According to another aspect of the present invention, the present invention also provides a battery, the battery including the battery top cover structure described above.

[0015] Beneficial effects:

[0016] This utility model provides a battery top cover structure, in which a positive electrode post and a negative electrode post are respectively inserted into a top cover sheet. A plastic sleeve is fitted around the outer periphery of the positive electrode post, and the plastic sleeve is bonded to the upper surface of the top cover sheet. Similarly, a plastic sleeve is fitted around the outer periphery of the negative electrode post, and the plastic sleeve is bonded to the upper surface of the top cover sheet. A first base plate in the positive electrode post is connected to both a first column and a first mating part. The first column and the first mating part are spaced apart, and a positive electrode heat insulation groove is provided between them. The plastic sleeve is connected to the first mating part. A second base plate in the negative electrode post is connected to both a second column and a second mating part. The second column and the second mating part are spaced apart, and a negative electrode heat insulation groove is provided between them. The plastic sleeve is connected to the second mating part. When the positive and negative terminals are welded separately, or when the temperature of the positive and negative terminals rises during battery operation, the positive and negative heat insulation grooves respectively form air insulation layers. The positive heat insulation groove blocks the heat conduction path between the first pillar and the first mating part of the positive terminal, concentrating heat on the first pillar to prevent heat transfer to the plastic on the positive electrode and avoid direct heat deformation. Simultaneously, the negative heat insulation groove blocks the heat conduction path between the second pillar and the second mating part of the negative terminal, concentrating heat on the second pillar to prevent heat transfer to the plastic on the negative electrode and avoid direct heat deformation. This prevents deformation of the plastic on both the positive and negative terminals due to temperature increases, enhancing sealing and improving the overall safety and stability of the battery when the positive and negative terminals are at high temperatures. Thus, it achieves the technical effect of improving battery sealing, safety, and stability even at high terminal temperatures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a battery top cover structure provided for an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the first base plate and the second base plate in a battery top cover structure provided in an embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the first column and the second column in a battery top cover structure provided in an embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the positive limit slot in a battery top cover structure provided in an embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the positive electrode heat insulation groove in a battery top cover structure provided in an embodiment of the present utility model.

[0023] Figure 6 This is a schematic diagram of the negative electrode heat insulation groove in a battery top cover structure provided in an embodiment of the present utility model.

[0024] Figure 7 This is a schematic diagram of the positive electrode mounting hole and the negative electrode mounting hole in a battery top cover structure provided in an embodiment of this utility model. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] To enable those skilled in the art to better understand the solutions of this application, 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 scope of protection of this application.

[0027] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0028] In this specification, references such as "one embodiment" or "some embodiments" mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the terms "comprising," "including," "having," and variations thereof in this specification all mean "including but not limited to," unless otherwise specifically emphasized. It should be noted that in the embodiments of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0029] It should be noted that, in the embodiments of this utility model, when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. Furthermore, in the embodiments of this application, "connection" can also be understood as an electrical connection; the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the utility model.

[0030] The first embodiment of this utility model provides a battery top cover structure, please refer to [link / reference]. Figures 1 to 7 As shown, Figure 1 This is a schematic diagram of a battery top cover structure provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the first base plate and the second base plate in a battery top cover structure provided by an embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of the first column and the second column in a battery top cover structure provided by an embodiment of the present invention. Figure 4 This is a schematic diagram of the positive limit slot in a battery top cover structure provided by an embodiment of the present invention. Figure 5 This is a schematic diagram of the positive electrode heat insulation groove in a battery top cover structure provided by an embodiment of the present invention. Figure 6 This is a schematic diagram of the negative electrode heat insulation groove in a battery top cover structure provided by an embodiment of this utility model. Figure 7This is a schematic diagram of the positive and negative electrode mounting holes in a battery top cover structure provided by an embodiment of the present invention. The battery top cover structure provided by this embodiment of the present invention includes a top cover sheet 1, a positive electrode post 2, a negative electrode post 3, a positive electrode upper plastic 4, and a negative electrode upper plastic 5. The positive electrode post 2 and the negative electrode post 3 are respectively mounted on the top cover sheet 1. The positive electrode upper plastic 4 is fitted around the outer periphery of the positive electrode post 2 and is bonded to the upper surface of the top cover sheet 1. The negative electrode upper plastic 5 is fitted around the outer periphery of the negative electrode post 3 and is bonded to the upper surface of the top cover sheet 1. The positive electrode post 2 includes a first column 21, a first mating part 22, and a first base plate 23. The first base plate 23 is respectively connected to the first column 21. The first column 21 and the first mating part 22 are arranged at intervals. A positive electrode heat insulation groove 24 is provided between the first column 21 and the first mating part 22. The plastic 4 on the positive electrode is connected to the first mating part 22. The negative electrode column 3 includes a second column 31, a second mating part 32 and a second base plate 33. The second base plate 33 is connected to the second column 31 and the second mating part 32 respectively. The second column 31 and the second mating part 32 are arranged at intervals. A negative electrode heat insulation groove 34 is provided between the second column 31 and the second mating part 32. The plastic 5 on the negative electrode is connected to the second mating part 32.

[0031] The positive electrode post 2 and the negative electrode post 3 can be respectively inserted into the preset holes of the top cover plate 1. The first post 21 can include a cylindrical copper material. The first post 21 is used to connect the external circuit. The first post 21, the first mating part 22 and the first base plate 23 can be integrally formed. For example, by machining, a positive electrode heat insulation groove 24 in the form of an annular groove can be machined on the upper surface of the positive post 2. The positive electrode heat insulation groove 24 is used for heat insulation. Alternatively, the first base plate 23 in the form of a square can be stamped firstly, and then an aluminum rod can be cut into an aluminum post 21. The aluminum ring can be extruded, cut and machined to form the first mating part 22. Then, the first post 21 and the first mating part 22 can be welded to the first base plate 23 by friction welding to form a complete positive post 2. The negative electrode post 3 can be made using the same process as the positive post 2.

[0032] The negative electrode post 3 can be symmetrically arranged with the positive electrode post 2, and the inner wall of the plastic 5 on the negative electrode can be tightly connected to the second mating part 32. Additionally, the first post 21 and the second post 31 can also have a stepped structure to optimize current conduction. The shapes of the first base plate 23 and the second base plate 33 are not limited to discs; they can also include square or polygonal shapes to increase the bonding area with the plastic. Inert gases, such as nitrogen, can also be filled into the positive electrode insulation groove 24 and the negative electrode insulation groove 34 respectively to improve the insulation effect.

[0033] During the welding process of the positive electrode post 2 and the negative electrode post 3, the welding heat causes the temperature of the first post 21 and the second post 31 to rise. The positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 form an air heat insulation layer at this stage. The low thermal conductivity of air will block the heat transfer from the first post 21 to the first mating part 22, and similarly block the heat transfer from the second post 31 to the second mating part 32. That is, the heat is concentrated in the first post 21 and the second post 31, rather than diffused to the plastic on the positive electrode 4 and the plastic on the negative electrode 5.

[0034] During battery operation, such as high-current discharge, the temperatures of the first column 21 and the second column 31 will rise. The positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 will increase the thermal resistance path, reduce the heat conduction rate, and prevent the plastic 4 on the positive electrode and the plastic 5 on the negative electrode from softening and deforming. In addition, the positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 may also include multiple concentric annular grooves to increase the heat insulation surface area.

[0035] In this embodiment, the positive electrode post 2 and the negative electrode post 3 are respectively inserted into the top cover plate 1. The positive electrode plastic 4 is sleeved on the outer periphery of the positive electrode post 2, and the positive electrode plastic 4 is bonded to the upper surface of the top cover plate 1. The negative electrode plastic 5 is sleeved on the outer periphery of the negative electrode post 3, and the negative electrode plastic 5 is bonded to the upper surface of the top cover plate 1. The first base plate 23 in the positive electrode post 2 is connected to the first column 21 and the first mating part 22 respectively. The first column 21 and the first mating part 22 are arranged at intervals. A positive electrode heat insulation groove 24 is provided between the first column 21 and the first mating part 22. The positive electrode plastic 4 is connected to the first mating part 22. The second base plate 33 in the negative electrode post 3 is connected to the second column 31 and the second mating part 32 respectively. The second column 31 and the second mating part 32 are arranged at intervals. A negative electrode heat insulation groove 34 is provided between the second column 31 and the second mating part 32. The negative electrode plastic 5 is connected to the second mating part 32. When the positive electrode post 2 and negative electrode post 3 are welded separately, or when the temperature of the positive electrode post 2 and negative electrode post 3 rises during battery operation, the positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 will respectively form an air heat insulation layer. The positive electrode heat insulation groove 24 blocks the heat conduction path between the first column 21 and the first mating part 22 of the positive electrode post 2, causing the heat to concentrate on the first column 21, preventing heat transfer to the plastic 4 on the positive electrode and avoiding direct heat deformation of the plastic 4 on the positive electrode. At the same time, the negative electrode heat insulation groove 34 blocks the heat conduction path between the second column 31 and the second mating part 32 of the negative electrode post 3, causing the heat to concentrate on the second column 31, preventing heat transfer to the plastic 5 on the negative electrode and avoiding direct heat deformation of the plastic 5 on the negative electrode. This can prevent deformation of the plastic 4 on the positive electrode and the plastic 5 on the negative electrode due to temperature rise, thereby enhancing the sealing performance and improving the overall safety and stability of the battery when the positive electrode post 2 and the negative electrode post 3 are at high temperatures. This achieves the technical effect of improving battery sealing, safety, and stability at high electrode temperatures.

[0036] In one implementation, when viewed along the direction from the plastic 4 on the positive electrode towards the top cover plate 1, the distance between the bottom of the positive electrode heat insulation groove 24 and the first base plate 23 is smaller than the distance between the bottom of the plastic 4 on the positive electrode and the first base plate 23, and the distance between the top of the first column 21 and the top cover plate 1 is greater than the distance between the plastic 4 on the positive electrode and the top cover plate 1. When viewed along the direction from the first column 21 towards the first mating part 22, the width of the positive electrode heat insulation groove 24 is greater than 0 mm. The above-mentioned depth setting of the positive electrode heat insulation groove 24 makes the bottom of the positive electrode heat insulation groove 24 closer to the first base plate 23 where the heat source is concentrated, increasing the longitudinal coverage of the air insulation layer. The top of the first column 21 is far away from the top cover plate 1 and the solid separation of the positive electrode heat insulation groove 24, so that heat will be confined to the area where the first column 21 is located during the welding of the positive electrode column 2 or high-temperature conditions. A positive electrode heat insulation groove 24 with a width greater than 0 mm will form a continuous air gap layer, blocking the path of heat conduction from the first column 21 to the first mating part 22, so as to avoid heat transfer to the plastic 4 on the positive electrode, thereby reducing the risk of heat deformation of the plastic 4 on the positive electrode and improving the battery sealing and safety when the first column 21 is at high temperature.

[0037] In some embodiments, when viewed along the plastic 5 on the negative electrode towards the top cover plate 1, the distance between the bottom of the negative electrode heat insulation groove 34 and the first base plate 23 is smaller than the distance between the bottom of the plastic 5 on the negative electrode and the first base plate 23. Furthermore, the distance between the top of the first column 21 and the top cover plate 1 is greater than the distance between the plastic 5 on the negative electrode and the top cover plate 1. When viewed along the first column 21 towards the first mating part 22, the width of the negative electrode heat insulation groove 34 is greater than 0 mm. This depth setting of the negative electrode heat insulation groove 34 allows it to be closer to the heat source concentration area of ​​the second base plate 33, expanding the longitudinal range of the air insulation layer. The physical isolation between the top of the second column 31 and the top cover plate 1, and the negative electrode heat insulation groove 34, ensures that heat is confined to the area where the second column 31 is located when the negative electrode column 3 is at a high temperature. The width of the negative electrode heat insulation groove 34 is greater than 0 mm, which will achieve air gap continuity, block the heat conduction path from the second column 31 to the second mating part 32, and prevent heat from being transferred to the plastic 5 on the negative electrode. This can reduce the probability of the plastic 5 on the negative electrode being deformed by heat, and maintain the battery sealing stability and safety when the second column 31 is at high temperature.

[0038] In some embodiments, both the positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 are annular grooves. The annular groove structure of the positive electrode heat insulation groove 24 surrounds the first column 21 of the positive electrode post 2, and the annular groove structure of the negative electrode heat insulation groove 34 surrounds the second column 31 of the negative electrode post 3. These form continuous closed air cavities at the junction of the first column 21 and the first mating part 22, and at the junction of the second column 31 and the second mating part 32, thereby uniformly blocking radial heat conduction paths and eliminating local heat dissipation weaknesses. At the same time, the groove shape can maximize the effective volume and contact area of ​​the gas insulation layer, enhance heat blocking efficiency, and reduce the possibility of anisotropic thermal deformation of the plastic 4 on the positive electrode and the plastic 5 on the negative electrode.

[0039] In some embodiments, the central axis of the positive electrode insulation groove 24 is parallel to the central axis of the first column 21, and the central axis of the negative electrode insulation groove 34 is parallel to the central axis of the second column 31. The parallelism between the positive electrode insulation groove 24 and the axis of the first column 21 ensures a uniform distribution of the air insulation layer thickness along the circumference of the first column 21. The parallelism between the negative electrode insulation groove 34 and the axis of the second column 31 maintains the geometric consistency of the insulation gap on the negative electrode side. This axially parallel arrangement avoids the localized thermal bridging effect caused by the misalignment of the positive electrode insulation groove 24 and the negative electrode insulation groove 34. In other words, it optimizes the thermal resistance distribution through geometric symmetry, thereby enhancing the stability of the air insulation layer.

[0040] In some embodiments, the first mating part 22 is provided with a positive limit groove 221, which matches the plastic 4 on the positive electrode, with the plastic 4 on the positive electrode at least partially embedded inside the positive limit groove 221. The second mating part 32 is provided with a negative limit groove 321, which matches the plastic 5 on the negative electrode, with the plastic 5 on the negative electrode at least partially embedded inside the negative limit groove 321. The fitting structure of the plastic 4 on the positive electrode and the positive limit groove 221 can enhance the mechanical interlocking and sealing fit of the interface, while the fitting structure of the plastic 5 on the negative electrode and the negative limit groove 321 can improve assembly accuracy and contact sealing. Under the premise that the positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 block heat conduction, the positive limit groove 221 and the negative limit groove 321 can further reduce the risk of displacement of the plastic parts due to vibration or thermal expansion. At the same time, the positive limit groove 221 and the negative limit groove 321 limit the plastic 4 on the positive electrode and the plastic 5 on the negative electrode, which can work together to suppress the possibility of high temperature deformation.

[0041] In some embodiments, the battery top cover structure provided in Embodiment 1 of this utility model further includes a positive electrode sealing ring 6 and a negative electrode sealing ring 7. The positive electrode sealing ring 6 is sleeved on the outer periphery of the first mating part 22 and is located between the positive electrode plastic 4 and the top cover plate 1. The negative electrode sealing ring 7 is sleeved on the outer periphery of the second mating part 32 and is located between the negative electrode plastic 5 and the top cover plate 1. Based on the positive electrode heat insulation groove 24 blocking the heat conduction path, the positive electrode sealing ring 6 fills the interface gap between the positive electrode plastic 4 and the top cover plate 1, forming a secondary physical sealing layer. Additionally, the negative electrode sealing ring 7 can also supplement the sealing interface between the negative electrode plastic 5 and the top cover plate 1. When high temperature causes extremely small microscopic deformations in the positive electrode plastic 4 and the negative electrode plastic 5, the positive electrode sealing ring 6 and the negative electrode sealing ring 7 elastically compensate for the interface displacement, maintaining sealing continuity, i.e., suppressing the risk of interface leakage under high temperature conditions.

[0042] In some embodiments, the battery top cover structure provided in Embodiment 1 of this utility model further includes a lower plastic 8, which has a positive electrode mounting hole 81 and a negative electrode mounting hole 82. The first column 21 and the first mating part 22 respectively pass through the positive electrode mounting hole 81 and are connected to the first base plate 23. The second column 31 and the second mating part 32 respectively pass through the negative electrode mounting hole 82 and are connected to the second base plate 33. This achieves the constraint of the lateral displacement of the first column 21 and the second column 31 during welding or thermal expansion, and reduces the fluctuation of heat conduction efficiency caused by the vibration of the first column 21 and the second column 31 at high temperature.

[0043] In some embodiments, the top cover 1 is provided with a through groove 11, which is located between the positive electrode mounting hole 81 and the negative electrode mounting hole 82. The lower plastic 8 is also provided with a hollow groove 83 facing the through groove 11. The battery top cover structure provided in Embodiment 1 of this utility model also includes an explosion-proof valve 9 and a protective patch 91. The explosion-proof valve 9 is disposed between the through groove 11 and the hollow groove 83, and the protective patch 91 is disposed on the through groove 11. The through groove 11 and the hollow groove 83 form a pressure relief channel, and the explosion-proof valve 9, as a pressure-sensitive element, covers this channel. When the heat insulation mechanism fails, causing abnormal internal temperature rise of the battery, the explosion-proof valve 9 ruptures and releases pressure at a set pressure threshold. The protective patch 91 prevents external contaminants from entering the pressure relief channel, thus avoiding thermal runaway through rapid pressure relief.

[0044] To provide a detailed description of the battery provided by this utility model, the above embodiment 1 provides a detailed description of the battery top cover structure. Based on the same utility model concept, this application also provides a battery, as detailed in embodiment 2.

[0045] Embodiment 2 of this utility model provides a battery, including the battery top cover structure described above.

[0046] This utility model provides a battery in which a positive electrode post 2 and a negative electrode post 3 are respectively inserted into a top cover plate 1. A plastic 4 is fitted around the outer periphery of the positive electrode post 2 and is bonded to the upper surface of the top cover plate 1. A plastic 5 is fitted around the outer periphery of the negative electrode post 3 and is bonded to the upper surface of the top cover plate 1. In the positive electrode post 2, a first base plate 23 is connected to a first column 21 and a first mating part 22, which are arranged at intervals. A positive electrode heat insulation groove 24 is provided between the first column 21 and the first mating part 22. The plastic 4 is connected to the first mating part 22. In the negative electrode post 3, a second base plate 33 is connected to a second column 31 and a second mating part 32, which are arranged at intervals. A negative electrode heat insulation groove 34 is provided between the second column 31 and the second mating part 32. The plastic 5 is connected to the second mating part 32. When the positive electrode post 2 and negative electrode post 3 are welded separately, or when the temperature of the positive electrode post 2 and negative electrode post 3 rises during battery operation, the positive electrode heat insulation groove 24 and the negative electrode heat insulation groove 34 will respectively form an air heat insulation layer. The positive electrode heat insulation groove 24 blocks the heat conduction path between the first column 21 and the first mating part 22 of the positive electrode post 2, causing the heat to concentrate on the first column 21, preventing heat transfer to the plastic 4 on the positive electrode and avoiding direct heat deformation of the plastic 4 on the positive electrode. At the same time, the negative electrode heat insulation groove 34 blocks the heat conduction path between the second column 31 and the second mating part 32 of the negative electrode post 3, causing the heat to concentrate on the second column 31, preventing heat transfer to the plastic 5 on the negative electrode and avoiding direct heat deformation of the plastic 5 on the negative electrode. This can prevent deformation of the plastic 4 on the positive electrode and the plastic 5 on the negative electrode due to temperature rise, thereby enhancing the sealing performance and improving the overall safety and stability of the battery when the positive electrode post 2 and the negative electrode post 3 are at high temperatures. This achieves the technical effect of improving battery sealing, safety, and stability at high electrode temperatures.

[0047] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A battery top cover structure, characterized in that, The battery top cover structure includes a top cover sheet, a positive electrode post and a negative electrode post respectively passing through the top cover sheet, a positive electrode plastic sleeved on the outer periphery of the positive electrode post and bonded to the upper surface of the top cover sheet, and a negative electrode plastic sleeved on the outer periphery of the negative electrode post and bonded to the upper surface of the top cover sheet; wherein, the positive electrode post includes a first column, a first mating part, and a first base plate respectively connected to the first column and the first mating part, the first column and the first mating part are spaced apart, a positive electrode heat insulation groove is provided between the first column and the first mating part, and the positive electrode plastic sleeve is connected to the first mating part; the negative electrode post includes a second column, a second mating part, and a second base plate respectively connected to the second column and the second mating part, the second column and the second mating part are spaced apart, a negative electrode heat insulation groove is provided between the second column and the second mating part, and the negative electrode plastic sleeve is connected to the second mating part.

2. The battery top cover structure according to claim 1, characterized in that, Observing along the plastic on the positive electrode towards the top cover plate, the distance between the bottom of the positive electrode heat insulation groove and the first base plate is less than the distance between the bottom of the plastic on the positive electrode and the first base plate; and the distance between the top of the first column and the top cover plate is greater than the distance between the plastic on the positive electrode and the top cover plate; observing along the first column towards the first mating part, the width of the positive electrode heat insulation groove is greater than 0 mm.

3. The battery top cover structure according to claim 1, characterized in that, Observing along the plastic on the negative electrode towards the top cover plate, the distance between the bottom of the negative electrode heat insulation groove and the first base plate is less than the distance between the bottom of the plastic on the negative electrode and the first base plate; and the distance between the top of the first column and the top cover plate is greater than the distance between the plastic on the negative electrode and the top cover plate; observing along the first column towards the first mating part, the width of the negative electrode heat insulation groove is greater than 0 mm.

4. The battery top cover structure according to claim 1, characterized in that, Both the positive electrode heat insulation groove and the negative electrode heat insulation groove are annular grooves.

5. The battery top cover structure according to claim 4, characterized in that, The central axis of the positive electrode heat insulation groove is parallel to the central axis of the first column; the central axis of the negative electrode heat insulation groove is parallel to the central axis of the second column.

6. The battery top cover structure according to claim 1, characterized in that, The first mating part is provided with a positive limit groove that matches the plastic on the positive electrode, and the plastic on the positive electrode is at least partially embedded in the positive limit groove; the second mating part is provided with a negative limit groove that matches the plastic on the negative electrode, and the plastic on the negative electrode is at least partially embedded in the negative limit groove.

7. The battery top cover structure according to claim 1, characterized in that, The battery top cover structure also includes a positive electrode sealing ring sleeved on the outer periphery of the first mating part and located between the positive electrode plastic and the top cover sheet; and a negative electrode sealing ring sleeved on the outer periphery of the second mating part and located between the negative electrode plastic and the top cover sheet.

8. The battery top cover structure according to claim 1, characterized in that, The battery top cover structure also includes a lower plastic with a positive electrode mounting hole and a negative electrode mounting hole. The first column and the first mating part respectively pass through the positive electrode mounting hole and are connected to the first base plate. The second column and the second mating part respectively pass through the negative electrode mounting hole and are connected to the second base plate.

9. The battery top cover structure according to claim 8, characterized in that, The top cover is provided with a through groove, which is located between the positive electrode mounting hole and the negative electrode mounting hole; the lower plastic is also provided with a hollow groove facing the through groove; the battery top cover structure also includes an explosion-proof valve and a protective patch, the explosion-proof valve is located between the through groove and the hollow groove, and the protective patch is located in the through groove.

10. A battery, characterized in that, The battery includes the battery top cover structure as described in any one of claims 1 to 9.

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