Top cover structure and battery assembly

Abstract

The utility model discloses a top cover structure and a battery assembly, the top cover structure comprises a top cover sheet, a pole, a plastic part, a sealing part and an isolation part, and the top cover sheet is provided with a pole hole penetrating through two opposite surfaces of the top cover sheet; the pole is at least partially arranged in the pole hole; the plastic part is injection-molded in the pole hole and wraps the peripheral side surface of the pole; the sealing piece is abutted between the top cover plate and the pole; the separator is abutted between the top cover sheet and the pole, and the separator is located between the sealing member and the plastic member. Compared with the prior art, the top cover structure has the advantages that the plastic part is formed between the pole and the top cover piece through the injection molding process, the plastic part wraps the periphery of the pole, and the pole and the top cover piece can be directly fixed together, so that the use of parts is reduced, and the production cost of the top cover structure is reduced. And the top cover structure further comprises an isolation piece which is mainly used for isolating the sealing piece and the plastic piece, so that the structural integrity of the sealing piece can be effectively prevented from being damaged in the injection molding process, and the sealing effect of the battery assembly is prevented from being influenced.

Description

Technical Field

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

[0002] In new energy technologies, batteries hold an extremely important position. The battery top cover is a crucial component of the battery. In existing battery top cover designs, it typically consists of an upper plastic layer, a welding ring, a battery cover plate, terminals, and a lower plastic layer. Generally, the welding ring is fixed to the terminals via the upper plastic layer, and then the welding ring is laser-welded to the top cover plate. This production method results in a large number of top cover components, and during assembly, welding processes such as laser welding and ultrasonic welding cannot be avoided to assemble and fix the components. This leads to a long production process and low production efficiency. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the present invention provides a top cover structure and battery assembly, which can reduce the number of parts and reduce production costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A top cover structure includes a top cover sheet, an electrode post, a plastic component, a sealing component, and a spacer. The top cover sheet has electrode post holes penetrating its two opposite surfaces. The electrode post is at least partially disposed within the electrode post holes. The plastic component is injection molded into the electrode post holes and covers the peripheral side surface of the electrode post. The sealing component abuts against the top cover sheet and the electrode post. The spacer abuts against the top cover sheet and the electrode post, and the spacer is located between the sealing component and the plastic component.

[0006] In one embodiment, the plastic part includes a first step portion and a second step portion located on opposite sides thereon. The first step portion overlaps with the outer side of the top cover sheet, and the second step portion overlaps with the inner side of the top cover sheet. The spacer is disposed between the second step portion and the seal.

[0007] In one embodiment, the pole includes a first extension and a second extension located on opposite sides thereon. The plastic part has mounting holes that penetrate its opposite surfaces. The pole passes through the mounting holes, and the first extension overlaps with the first step portion, the second extension overlaps with the second step portion, and the seal is at least partially disposed between the second extension and the top cover plate.

[0008] In one embodiment, the sealing member includes a vertical portion and a horizontal portion connected to each other. The vertical portion is sleeved on the outer periphery of the second extension, and the horizontal portion extends into the inner side of the second extension and the top cover plate. The isolation member is disposed between the horizontal portion and the second step portion.

[0009] In one embodiment, the length of the first extension along the length direction of the top cover sheet is L1, where L1 ≥ 0.2 mm.

[0010] In one embodiment, the top cover plate has at least one through hole around the pole hole, and the plastic part extends at least partially into the through hole.

[0011] In one embodiment, the number of vias is multiple, the area of ​​the multiple vias is S1, the area of ​​the pole hole is S2, and S1 / S2 = 3% to 70%.

[0012] In one embodiment, along the width direction of the top cover plate, the length of the pole is L2, the length of the top cover plate is L3, and L2 / L3 = 20% to 95%;

[0013] Along the length of the top cover plate, the length of the pole is L4, the length of the top cover plate is L5, and L4 / L5 = 5% to 60%;

[0014] The isolating element is made of insulating material, and its length along the thickness direction of the top cover sheet is L6, where L6 ≥ 0.2 mm.

[0015] In one embodiment, the top cover structure includes an insulating sheet, which is attached to the inner side of the top cover sheet. Along the thickness direction of the top cover sheet, the length of the insulating sheet is L7, where 0.02mm < L7 < 2mm.

[0016] This utility model also provides a battery assembly, including a top cover structure and a battery housing as described in any of the above embodiments, wherein the top cover structure is connected to the battery housing, and the battery housing is used to install battery cells.

[0017] The beneficial effects of this utility model are as follows: This application provides a top cover structure and a battery assembly. The top cover structure includes a top cover sheet, terminals, a plastic part, a sealing element, and a separator. The top cover sheet has terminals through its two opposite surfaces. At least part of the terminals are disposed within the terminals. The plastic part is injection molded into the terminals and wraps around the periphery of the terminals. The sealing element abuts against the top cover sheet and the terminals. The separator abuts against the top cover sheet and the terminals, and is located between the sealing element and the plastic part. Compared with the prior art, this application uses injection molding to fix the terminals and the top cover sheet together. Through the injection molding process, a plastic part is formed between the terminals and the top cover sheet, which wraps around the periphery of the terminals and can directly fix the terminals and the top cover sheet together. This method eliminates the need for welding rings, reduces the number of components used, and lowers the production cost of the top cover structure. Furthermore, the top cover structure also includes a separator, which is mainly used to separate the seals and plastic parts. This effectively prevents damage to the structural integrity of the seals during injection molding, thus avoiding affecting the sealing effect of the battery assembly and ensuring the production quality of the top cover structure. Battery assemblies using the above-mentioned top cover structure can effectively reduce battery production costs, simplify the production process, and improve production efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a battery assembly according to an embodiment of the present invention is shown;

[0019] Figure 2 A cross-sectional schematic diagram of a battery assembly according to an embodiment of the present invention is shown;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0022] Figure 5 An exploded view of a top cover structure according to an embodiment of the present invention is shown;

[0023] Figure 6 A cross-sectional schematic diagram of a top cover sheet according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic diagram of the structure of a top cover sheet according to an embodiment of the present invention is shown;

[0025] Reference numerals: 10, top cover structure; 20, battery casing;

[0026] 1. Top cover plate; 11. Pole post hole; 12. Through hole;

[0027] 2. Plastic part; 21. Mounting hole; 22. First step; 23. Second step;

[0028] 3. Pole post; 31. First extension; 32. Second extension;

[0029] 4. Sealing element; 41. Vertical part; 42. Horizontal part;

[0030] 5. Isolation components;

[0031] 6. Insulating sheet. Detailed Implementation

[0032] In this utility model, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or constituent parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] See Figure 1 This application provides a battery assembly, including a top cover structure 10 and a battery casing 20. The top cover structure 10 is connected to the battery casing 20 and defines an installation space with the battery casing 20. The battery cell is installed within the installation space. In practical applications, the battery cell is installed within the installation space and connected to the top cover structure 10. The top cover structure 10 is a key component for the battery cell to transmit electrical energy. The battery cell can be connected to external circuits or devices through the terminals 3 on the top cover structure 10 to realize the input and output of electrical energy.

[0038] Specifically, the top cover structure 10 includes a top cover plate 1, an electrode post 3, a plastic part 2, a sealing member 4, and an isolation member 5. The top cover plate 1 has an electrode post hole 11 that penetrates its two opposite surfaces. The electrode post 3 is at least partially disposed in the electrode post hole 11. The plastic part 2 is injection molded into the electrode post hole 11 and wraps around the peripheral side of the electrode post 3. The sealing member 4 abuts between the top cover plate 1 and the electrode post 3. The isolation member 5 abuts between the top cover plate 1 and the electrode post 3, and the isolation member 5 is located between the sealing member 4 and the plastic part 2.

[0039] In practical applications, the terminal post 3 is a key component for power transmission in the battery cell. The top cover plate 1 provides a fixed position and support for the terminal post 3. In existing technologies, ultrasonic welding or laser welding is typically used to weld the terminal post 3 onto a welding ring with plastic, and then the welding ring is welded onto the top cover plate 1 to complete the fixation of the terminal post 3. This method involves more components, a longer production process, and higher production costs.

[0040] Based on this, this application uses injection molding to fix the terminal post 3 and the top cover plate 1 together. The top cover plate 1 has an outer side and an inner side, and has a terminal post hole 11 that penetrates the outer side and the inner side. The terminal post 3 passes through the terminal post hole 11 and its opposite ends protrude from the terminal post hole 11. That is, one end of the terminal post 3 protrudes from the outer side of the top cover plate 1, and the other end protrudes from the inner side of the top cover plate 1. The side of the terminal post 3 that protrudes from the outer side is convenient for connection with external circuits or equipment, while the side that protrudes from the inner side is convenient for soldering devices such as tabs. It should be noted that the side of the top cover plate 1 facing the battery case 20 is the inner side, and the side of the top cover plate 1 facing away from the battery case 20 is the outer side.

[0041] Meanwhile, along the circumferential direction of the pole post 3, a gap is left between the pole post 3 and the hole wall of the pole post hole 11. Injection molding is performed at this gap, and a plastic part 2 is formed between the pole post 3 and the top cover plate 1 through the injection molding process. The plastic part 2 wraps around the outer periphery of the pole post 3 and can directly fix the pole post 3 and the top cover plate 1 together. This method improves the connection stability between the pole post 3 and the top cover plate 1, eliminates the need for welding rings, reduces the use of parts, and lowers the production cost of the top cover structure 10.

[0042] Furthermore, the top cover structure 10 also includes a separator 5, which is mainly used to isolate the seal 4 and the plastic part 2. The seal 4 abuts between the top cover plate 1 and the terminal post 3 to seal the gap between the terminal post 3 and the top cover plate 1, preventing external impurities from entering the battery case 20 and preventing electrolyte leakage. During the injection molding of the plastic part 2, to prevent excessive injection pressure and temperature from damaging the seal 4, this application provides a separator 5, which can effectively prevent damage to the structural integrity of the seal 4 during the injection molding process, avoid affecting the sealing effect of the battery assembly, and ensure the production quality of the battery assembly.

[0043] It should be noted that the top cover plate 1 is also equipped with an explosion-proof structure. When abnormal conditions occur inside the battery assembly, such as excessive temperature or excessive pressure, it may cause dangers such as explosion. The explosion-proof structure (such as an explosion-proof valve) in the top cover plate 1 can rupture or open in time when the pressure reaches a certain threshold, releasing the internal pressure, avoiding a violent battery explosion, and reducing safety risks.

[0044] See Figure 2 and Figure 3 The plastic part 2 includes a first step portion 22 and a second step portion 23 located on opposite sides of it. The first step portion 22 overlaps with the outer side of the top cover plate 1, and the second step portion 23 overlaps with the inner side of the top cover plate 1. The separator 5 is disposed between the second step portion 23 and the seal 4.

[0045] To describe clearly, Figure 3The Z-direction represents the thickness direction of the top cover plate 1, which is also the height direction of the plastic part 2. The plastic part 2 has a first step 22 and a second step 23 formed along its height direction. The first step 22 and the second step 23 overlap the opposite surfaces of the top cover plate 1, allowing the plastic part 2 to be clamped to the top cover plate 1. This increases the structural strength of the plastic part 2; when the battery assembly is subjected to external forces such as pressure, tension, or vibration, the first step 22 and the second step 23 prevent the plastic part 2 from shifting or deforming, enhancing structural stability. Furthermore, it strengthens the connection between the plastic part 2 and the top cover plate 1; the steps increase the contact area and friction, making the connection more secure. The second step 23 also provides a certain sealing effect, and the spacer 5 is positioned between the second step 23 and the seal 4, protecting the seal 4 and preventing damage during injection molding.

[0046] See Figure 4 The pole post 3 includes a first extension 31 and a second extension 32 located on opposite sides of it. The plastic part 2 has a mounting hole 21 that penetrates its opposite surfaces. The pole post 3 passes through the mounting hole 21, and the first extension 31 overlaps with the first step 22, the second extension 32 overlaps with the second step 23, and the sealing member 4 is at least partially disposed between the second extension 32 and the top cover plate 1.

[0047] To describe clearly, Figure 4 The Z-direction indicates the thickness direction of the top cover plate 1. In practical applications, along the thickness direction, the plastic part 2 has mounting holes 21 penetrating its two opposing surfaces. The electrode post 3 passes through the mounting holes 21, and its two ends respectively form a first extension 31 and a second extension 32. The first extension 31 overlaps the first step 22 of the plastic part 2, and the second extension 32 overlaps the second step 23 of the plastic part 2. Thus, the first extension 31 and the second extension 32 form a stepped structure, which increases the connection stability between the electrode post 3 and the plastic part 2, preventing the electrode post 3 from shaking or loosening when the battery assembly is subjected to external force. At the same time, the sealing member 4 can be disposed between the second extension 32 and the inner side of the top cover plate 1. The second extension 32 plays a certain role in positioning and fixing the sealing member 4, facilitating the installation of the sealing member 4 and achieving sealing protection.

[0048] See Figure 3 and Figure 4 The sealing member 4 includes a vertical part 41 and a horizontal part 42 connected to each other. The vertical part 41 is sleeved on the outer periphery of the second extension 32, and the horizontal part 42 extends into the inner side of the second extension 32 and the top cover plate 1. The isolation member 5 is disposed between the horizontal part 42 and the second step part 23.

[0049] In one embodiment, the seal 4 can be configured as an L-shape, comprising two mutually perpendicular vertical portions 41 and horizontal portions 42. This structure provides a double sealing barrier. The vertical portions 41 fit tightly against the outer periphery of the second extension 32, and the horizontal portions 42 fit against the top surface of the second extension 32 and abut against the inner side of the top cover plate 1, providing better sealing protection and facilitating positioning and installation. At the same time, the L-shaped seal 4 can adapt to pressure and leakage paths in different directions. When pressure acts from the horizontal direction, the horizontal side of the L-shaped seal 4 can effectively block leakage; when pressure acts from the vertical direction, the vertical side plays the main sealing role.

[0050] Thus, by placing the separator 5 between the horizontal portion 42 and the second step portion 23, the effect of separating the plastic part 2 and the sealing part 4 can be achieved. Since both the horizontal portion 42 and the second step portion 23 extend in the horizontal direction, the separator 5 placed between the horizontal portion 42 and the second step portion 23 only needs to have a small volume to achieve the separation function. For example, if the separator 5 is ring-shaped, the material used in the production of the separator 5 can be reduced, further reducing the cost.

[0051] See again Figure 4 , Figure 4 In the X direction, the length direction of the top cover plate 1 is represented, and the Z direction, the thickness direction of the top cover plate 1 is represented. In one embodiment, the length of the first extension 31 along the length direction of the top cover plate 1 is L1, where L1 ≥ 0.2 mm. For example, the first extension 31 can be set to a length of 0.25 mm, 0.3 mm, etc. In this way, the first extension 31 can enhance the stress strength of the pole post 3.

[0052] See again Figure 4 In one embodiment, the material of the isolator 5 is an insulating material, and the length of the isolator 5 along the thickness direction of the top cover sheet 1 is L6, where L6 ≥ 0.2 mm; for example, the isolator 5 can be 0.25 mm or 0.3 mm, so that the isolator 5 can effectively isolate the plastic part 2 and the seal 4 and protect the seal 4 to prevent the seal 4 from being damaged during injection molding.

[0053] See Figure 5 and Figure 6 The top cover plate 1 has at least one through hole 12 around the pole hole 11, and the plastic part 2 extends at least partially into the through hole 12. During injection molding, the injection liquid can pass through the through hole 12, so that the formed plastic part 2 is firmly bonded to the top cover plate 1, thereby improving the connection stability between the plastic part 2 and the top cover plate 1.

[0054] In one embodiment, there can be multiple vias 12, with the area of ​​the multiple vias 12 being S1 and the area of ​​the terminal hole 11 being S2, where S1 / S2 = 3% to 70%. The multiple vias 12 can be evenly spaced around the terminal hole 11 to improve the structural strength of the plastic part 2. The ratio of the total area of ​​the multiple vias 12 to the total area of ​​the terminal hole 11 can be between 3% and 70%. For example, S1 / S2 can be set to values ​​such as 20% or 30%. This setting improves the compatibility of production design. In the production of larger-sized battery modules, the ratio of S1 / S2 can be increased, thereby improving the structural stability of the plastic part 2. In the production of smaller-sized battery modules, the ratio of S1 / S2 can be decreased, saving material in the plastic part 2 and reducing production costs.

[0055] See Figure 4 and Figure 5 The top cover structure 10 also includes an insulating sheet 6, which is attached to the inner side of the top cover sheet 1. The length of the insulating sheet 6 along the thickness direction of the top cover sheet 1 is L7, where 0.02mm < L7 < 2mm.

[0056] In one embodiment, to prevent the battery cell from directly contacting the top cover plate 1, an insulating sheet 6 is attached to the inner surface of the top cover plate 1. The insulating sheet 6 can prevent the battery cell from directly rubbing against the inner surface of the top cover plate 1; and when the battery assembly is subjected to external pressure, the top cover plate 1 will transmit the pressure to the interior. The insulating sheet 6 can play a role in dispersing pressure and preventing pressure from concentrating in a certain part of the battery cell, thus preventing damage to the battery cell.

[0057] The insulating sheet 6 can be bonded to the top cover sheet 1 by means of hot melting or adhesive bonding. The hot melting process can firmly attach the insulating sheet 6 to the inner side of the top cover sheet 1, enhancing the connection stability; the adhesive bonding process can simplify the installation of the insulating sheet 6, reduce equipment requirements, facilitate operation, and lower costs. At the same time, along the thickness direction of the top cover sheet 1, the length of the insulating sheet 6 can be set to values ​​such as 0.1mm and 0.5mm.

[0058] See Figure 7 , Figure 7 In the X direction, the length direction of the top cover plate 1 is represented, and the width direction of the top cover plate 1 is represented. In one embodiment, along the width direction of the top cover plate 1, the length of the pole post 3 is L2, the length of the top cover plate 1 is L3, and L2 / L3 = 20% to 95%; along the length direction of the top cover plate 1, the length of the pole post 3 is L4, the length of the top cover plate 1 is L5, and L4 / L5 = 5% to 60%.

[0059] In practical applications, the size ratio of the terminal post 3 to the top cover plate 1 varies depending on the type of battery and its capacity. Generally, high-capacity batteries have larger terminal posts 3 to meet higher current output and input requirements. For example, the width L2 of the terminal post 3 / the width L3 of the top cover plate 1 can be set to 60% or 70%, and the length L4 of the terminal post 3 / the length L5 of the top cover plate 1 can be set to 40% or 50%. This increases the diameter of the terminal post 3, reducing resistance and heat generation during current flow. Furthermore, this application uses injection molding to fix the terminal post 3 and the top cover plate 1, ensuring a stable connection even with the increased size of the terminal post 3, meeting the production requirements of the battery module.

[0060] It should be noted that when a single-sided pole hole 11 is used, that is, when the top cover plate 1 only has one pole hole 11, the length L4 of the pole 3 and the length L5 of the top cover plate 1 can exceed 50%.

[0061] Unlike existing technologies, this application provides a top cover structure 10 and a battery assembly. The top cover structure 10 includes a top cover sheet 1, a terminal post 3, a plastic part 2, a sealing member 4, and a separator 5. The top cover sheet 1 has a terminal post hole 11 penetrating its two opposing surfaces. The terminal post 3 is at least partially disposed within the terminal post hole 11. The plastic part 2 is injection molded into the terminal post hole 11 and wraps around the peripheral side of the terminal post 3. The sealing member 4 abuts against the top cover sheet 1 and the terminal post 3. The separator 5 abuts against the top cover sheet 1 and the terminal post 3, and is located between the sealing member 4 and the plastic part 2. Compared to existing technologies, this application uses injection molding to fix the terminal post 3 and the top cover sheet 1 together. Through the injection molding process, a plastic part 2 is formed between the terminal post 3 and the top cover sheet 1. The plastic part 2 wraps around the outer periphery of the terminal post 3 and can directly fix the terminal post 3 and the top cover sheet 1 together. This method eliminates the need for welding rings, reduces the number of components used, and lowers the production cost of the top cover structure 10. Furthermore, the top cover structure 10 also includes a separator 5, which is mainly used to isolate the seal 4 and the plastic part 2. This effectively prevents damage to the structural integrity of the seal 4 during injection molding, avoids affecting the sealing effect of the battery assembly, and ensures the production quality of the top cover structure 10. Battery assemblies using the aforementioned top cover structure 10 can effectively reduce battery production costs, simplify the production process, and improve production efficiency.

[0062] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A top cover structure, characterized in that, include: The top cover plate has pole holes that penetrate its two opposite surfaces; The electrode post is at least partially disposed within the electrode post hole; A plastic part, injection molded into the electrode hole and covering the peripheral side of the electrode; A sealing element, which abuts between the top cover plate and the pole post; An isolator abuts between the top cover and the pole, and the isolator is located between the seal and the plastic part.

2. The top cover structure according to claim 1, characterized in that, The plastic part includes a first step portion and a second step portion located on opposite sides thereon. The first step portion overlaps with the outer side of the top cover sheet, and the second step portion overlaps with the inner side of the top cover sheet. The spacer is disposed between the second step portion and the seal.

3. The top cover structure according to claim 2, characterized in that, The pole includes a first extension and a second extension located on opposite sides of it. The plastic part has mounting holes that penetrate its opposite surfaces. The pole passes through the mounting holes. The first extension overlaps with the first step portion, and the second extension overlaps with the second step portion. The seal is at least partially disposed between the second extension and the top cover plate.

4. The top cover structure according to claim 3, characterized in that, The sealing element includes a vertical part and a horizontal part connected to each other. The vertical part is sleeved on the outer periphery of the second extension, and the horizontal part extends into the inner side of the second extension and the top cover plate. The isolation element is disposed between the horizontal part and the second step portion.

5. The top cover structure according to claim 3, characterized in that, Along the length direction of the top cover sheet, the length of the first extension is L1, where L1 ≥ 0.2 mm.

6. The top cover structure according to claim 1, characterized in that, The top cover plate has at least one through hole around the pole hole, and the plastic part extends at least partially into the through hole.

7. The top cover structure according to claim 6, characterized in that, The number of vias is multiple, the area of ​​the multiple vias is S1, the area of ​​the pole hole is S2, and S1 / S2 = 3% to 70%.

8. The top cover structure according to claim 1, characterized in that, Along the width direction of the top cover plate, the length of the pole is L2, the length of the top cover plate is L3, and L2 / L3 = 20% to 95%; Along the length of the top cover plate, the length of the pole is L4, the length of the top cover plate is L5, and L4 / L5 = 5% to 60%; The isolating element is made of insulating material, and its length along the thickness direction of the top cover sheet is L6, where L6 ≥ 0.2 mm.

9. The top cover structure according to claim 1, characterized in that, The top cover structure includes an insulating sheet, which is attached to the inner side of the top cover sheet. Along the thickness direction of the top cover sheet, the length of the insulating sheet is L7, where 0.02mm < L7 < 2mm.

10. A battery assembly, characterized in that, The invention includes the top cover structure and battery housing as described in any one of claims 1 to 9, wherein the top cover structure is connected to the battery housing, and the battery housing is used to install the battery cell.

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