Cover plate assembly, battery cell, new energy automobile, energy storage cabinet and energy storage system

Abstract

The utility model discloses a cover plate assembly, a battery cell, a new energy automobile, an energy storage cabinet and an energy storage system.The cover plate assembly comprises a cover plate body, a pole, an insulating part and a high-temperature-resistant part, the pole comprises a pole body and a pole plate body, and the pole body is arranged on the pole plate body; the insulating part is arranged between the cover plate main body and the pole column plate body; the high-temperature-resistant piece is arranged between the cover plate main body and the pole column plate body; when the high-temperature-resistant part is at any temperature smaller than or equal to 550 DEG C, the high-temperature-resistant part cannot be molten and / or carbonized. By introducing the high-temperature-resistant part, the heat resistance of the battery cell is enhanced, and the risk of positive and negative electrode short circuit under the high-temperature condition is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an energy storage system cover plate assembly, a battery cell, and an energy storage system. Background Technology

[0002] Larger single-cell batteries can directly reduce the cost per watt-hour of the battery. However, as the size increases, the structural strength of the cell will decrease. Under certain special safety conditions, the internal insulation problems of the cell will also become apparent. For example, during the heating test of a single cell, the existing internal insulation components are generally made of PP (polypropylene polymer). They have structural strength at room temperature, but due to their low melting point, they are not heat-resistant enough under high-temperature conditions, softening and causing short circuits between the positive and negative electrodes of the cell, which exacerbates thermal runaway and leads to cell explosion. Utility Model Content

[0003] In view of this, this application discloses a cover plate assembly, a battery cell, a new energy vehicle, an energy storage cabinet, and an energy storage system, which reduces the risk of positive and negative electrode contact at high temperatures by increasing the heat resistance of the battery cell.

[0004] Technical solution: In a first aspect, embodiments of this application provide a cover plate assembly, comprising:

[0005] Cover plate body;

[0006] An electrode post includes an electrode post body and an electrode post plate, wherein the electrode post body is disposed on the electrode post plate.

[0007] An insulating component is disposed between the cover plate body and the pole plate body;

[0008] A high-temperature resistant component is disposed between the cover plate body and the pole plate body;

[0009] The high-temperature resistant component will not melt and / or carbonize at any temperature less than or equal to 550°C.

[0010] In some embodiments, the high-temperature resistant component is made of polyimide.

[0011] In some embodiments, the thickness of the high-temperature resistant component is less than or equal to 0.3 mm; and / or, the thickness of the high-temperature resistant component is greater than or equal to 0.02 mm.

[0012] In some embodiments, the high-temperature resistant component has an insulation resistance greater than or equal to 200mΩ under a high voltage of 500V.

[0013] In some embodiments, the projection of the high-temperature resistant component in the thickness direction of the cover plate body covers the edge of the pole plate body.

[0014] In some embodiments, the high-temperature resistant component is located between the cover plate body and the insulating component.

[0015] In some embodiments, the high-temperature resistant component is located between the insulating component and the pole plate.

[0016] In some embodiments, the cover plate body has at least one first mounting hole for the pole body to pass through, and the high-temperature resistant component has at least one second mounting hole for the pole body to pass through.

[0017] In some embodiments, the cover plate assembly further includes a sealing element, the sealing element including a first sealing portion and a second sealing portion connected together, the first sealing portion passing through the first assembly hole and the second assembly hole and disposed between the cover plate body and the pole body, and the second sealing portion disposed between the cover plate body and the pole plate body.

[0018] In some embodiments, there is a gap between the inner wall of the second mounting hole of the high-temperature resistant component and the sealing component.

[0019] Secondly, embodiments of this application also provide a battery cell, the battery cell comprising:

[0020] case;

[0021] Electrode assemblies are disposed within the housing;

[0022] Any of the above-mentioned cover plate assemblies is disposed at the opening of the housing;

[0023] The housing and the cover plate body of the cover plate assembly form an accommodating space, and the pole plate, insulating component and high-temperature resistant component of the cover plate assembly are located within the accommodating space.

[0024] Thirdly, embodiments of this application also provide a new energy vehicle, the new energy vehicle comprising:

[0025] Vehicle body;

[0026] The aforementioned battery cell is mounted on the vehicle body.

[0027] Fourthly, embodiments of this application also provide an energy storage cabinet, the energy storage cabinet comprising:

[0028] Cabinet;

[0029] The aforementioned battery cell is disposed within the accommodating space of the cabinet.

[0030] Fifthly, embodiments of this application also provide an energy storage system, the energy storage system comprising:

[0031] At least two of the above-mentioned energy storage cabinets.

[0032] Several embodiments of this application have one of the following beneficial effects:

[0033] A cover plate assembly is provided, designed to enhance the cell's heat resistance by incorporating a high-temperature resistant component, reducing the risk of short circuits between the positive and negative electrodes under high-temperature conditions. The high-temperature resistant component will not melt or carbonize at any temperature less than or equal to 550°C. This design ensures that even if the insulation softens and is crushed by the terminal plate at high temperatures, the high-temperature resistant component maintains its structural integrity and isolates the terminal plate from the cover plate body. In other words, due to the high melting point of the high-temperature resistant component, even if the insulation softens at high temperatures, the component can still effectively isolate the terminal plate from the cover plate body, preventing short circuits between the positive and negative electrodes. During single-cell heating tests or other high-temperature conditions, the presence of the high-temperature resistant component significantly reduces the risk of thermal runaway, improving the overall safety of the cell. The high-temperature stability of the high-temperature resistant component ensures the structural integrity of the cover plate assembly under extreme conditions, avoiding insulation failure caused by insulation softening. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A three-dimensional structural schematic diagram of the cover plate assembly provided in an embodiment of this application;

[0036] Figure 2 An exploded view of a cover plate assembly provided in an embodiment of this application;

[0037] Figure 3 An exploded view of another cover plate assembly provided in an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the overall structure of the pole provided in the embodiments of this application;

[0039] Figure 5 A cross-sectional structural schematic diagram of a cover plate assembly provided in an embodiment of this application;

[0040] Figure 6 Provided for the embodiments of this application Figure 5 Enlarged view of point A in the middle;

[0041] Figure 7 Provided for the embodiments of this application Figure 5 Enlarged view at point B in the middle;

[0042] Figure 8An exploded view of the battery cell provided in the embodiments of this application;

[0043] Figure 9 An exploded view of another cover plate assembly provided in an embodiment of this application;

[0044] Figure 10 An exploded view of the cover plate assembly of the single-sided monopole column provided in the embodiments of this application;

[0045] Figure label:

[0046] 10-Cover plate assembly; 11-Cover plate body; 111-First assembly hole; 12-Pole post; 121-Pole post body; 122-Pole post plate; 13-Insulating component; 14-High temperature resistant component; 141-Inner wall; 142-Second assembly hole; 15-Sealing component; 151-First sealing part; 152-Second sealing part; 16-Welding block; 17-Third insulating component; 18-Gap; 19-Second high temperature resistant component;

[0047] 20-Electrode assembly;

[0048] 30 - Housing; 31 - Accommodation space. Detailed Implementation

[0049] 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.

[0050] It should be understood that although the terms first, second, etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes all combinations of any and more of the associated listed items.

[0051] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0052] With the continuous development of battery technology, increasing the capacity of individual battery cells has become a design goal for major manufacturers. The emergence of large-capacity cells (such as 600Ah+, 1000Ah+) can effectively reduce the cost per watt-hour of batteries. However, as the size of the cells increases, the structural strength of the cells may be affected, especially under certain special safety conditions, where the insulation problems inside the cells may become more prominent.

[0053] Currently, polypropylene (PP) is commonly used as the insulation material inside battery cells. This material exhibits good structural strength and insulation properties at room temperature. However, PP has a low melting point, and its heat resistance is insufficient under high-temperature conditions (such as during individual cell heating tests), making it prone to softening. When the insulation material softens at high temperatures, it can lead to a short circuit between the positive and negative electrodes inside the battery cell. This short circuit can exacerbate thermal runaway within the battery cell, potentially causing it to explode and posing a serious safety hazard.

[0054] The existing high-temperature softening of the insulation material inside the top cover can cause short circuits between the positive and negative electrodes inside the battery cell. This mainly occurs when the high-temperature softening of the lower plastic causes the terminal to contact the top cover body, resulting in a short circuit between the positive and negative electrodes inside the battery cell. In addition, there are also cases where the high-temperature softening of the upper plastic causes the welding block to contact the top cover body, leading to a short circuit between the positive and negative electrodes inside the battery cell.

[0055] In view of this, embodiments of this application provide a cover plate assembly to increase the heat resistance of the battery cell and reduce the risk of positive and negative electrode contact at high temperatures, thereby solving at least part of the above-mentioned technical problems.

[0056] Please see Figure 1 , Figure 2 , Figure 3 , Figure 1 This is a three-dimensional structural diagram of the cover plate assembly provided in the embodiments of this application. Figure 2 This is an exploded structural diagram of a cover plate assembly provided in an embodiment of this application. Figure 3 This is an exploded structural diagram of another cover plate assembly provided in an embodiment of this application. In this embodiment, the cover plate assembly 10 includes a cover plate body 11, an electrode post 12, an insulating component 13, and a high-temperature resistant component 14, wherein: the electrode post 12 includes an electrode post body 121 and an electrode post plate 122, with the electrode post body 121 disposed on the electrode post plate 122; the insulating component 13 is disposed between the cover plate body 11 and the electrode post plate 122; and the high-temperature resistant component 14 is disposed between the cover plate body 11 and the electrode post plate 122. The high-temperature resistant component 14 will not melt and / or carbonize at any temperature less than or equal to 550°C.

[0057] It should be noted that the cover plate body 11 has a first mounting hole 111. The electrode post body 121 and the electrode post plate 122 are connected. The electrode post body 121 passes through the first mounting hole 111. The electrode post plate 122 is located on one side of the cover plate body 11 and surrounds the electrode post body 121. The electrode post plate 122 is electrically connected to the electrode assembly 20 through an adapter piece, or directly to the electrode assembly 20. The insulating member 13 is disposed on one side of the cover plate body 11 and is at least partially disposed between the electrode post plate 122 and the cover plate body 11. The high-temperature resistant member 14 is disposed on at least one side of the insulating member 13 in its thickness direction to isolate the cover plate body 11 from the electrode post plate 122. The high-temperature resistant member 14 will not melt and / or carbonize at any temperature less than or equal to 550°C.

[0058] It should be noted that, as Figure 2 and Figure 3 As shown, when the cover plate assembly 10 has a positive terminal and a negative terminal, the cover plate body 11 has two first mounting holes 111, and there are two terminals 12, one terminal 12 serving as the positive terminal and the other terminal 12 serving as the negative terminal. The positive terminal passes through one first mounting hole 111, and the negative terminal passes through the other first mounting hole 111.

[0059] It should be noted that you should refer to [link / reference]. Figure 10 , Figure 10 This is an exploded view of the cover plate assembly with a single pole on one side provided in an embodiment of this application. The cover plate assembly 10 has only one pole 12, and the cover plate body 11 has a first mounting hole 111 through which the pole 12 passes.

[0060] Please see Figure 4 , Figure 4 This is a schematic diagram of the overall structure of the electrode post provided in an embodiment of this application. The electrode post 12 includes a connected electrode post body 121 and an electrode post plate 122. The electrode post body 121 is used to pass through the first mounting hole 111 of the cover plate body 11 to achieve electrical connection. The electrode post body 121 is inserted into the first mounting hole 111 of the cover plate body 11 along the thickness direction of the cover plate body 11, ensuring that the electrode post 12 can be stably installed on the cover plate body 11. The electrode post plate 122 is located on one side of the cover plate body 11, surrounding and connecting the electrode post body 121, and is mainly used for electrical connection with the electrode assembly 20. The electrode post plate 122 is located on either side of the cover plate body 11 in the thickness direction, surrounding and supporting the electrode post body 121.

[0061] It is understood that the high-temperature resistant component 14 is disposed on at least one side of the insulating component 13 in its thickness direction. That is, the high-temperature resistant component 14 can be disposed on the side of the insulating component 13 facing the cover plate body 11, or the high-temperature resistant component 14 can be disposed on the side of the insulating component 13 facing the pole plate body 122, or the high-temperature resistant component 14 can be disposed on both sides of the cover plate body 11 in the thickness direction to provide double protection.

[0062] Specifically, in a single-sided bipolar configuration, such as Figure 2 As shown, when the high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the cover plate body 11, the high-temperature resistant component 14 has a plate-like structure and is disposed between the insulating component 13 and the cover plate body 11. It is used to isolate the cover plate body 11 from the electrode plate 122 of the two electrodes 12 after the insulating component 13 softens at high temperature, preventing the cover plate body 11 from contacting the electrode plate 122 of either electrode 12, thus preventing a short circuit in the battery cell. Figure 3 As shown, when the high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the electrode plate 122, in order to avoid the structure of the insulating component 13, two high-temperature resistant components 14 are provided. One high-temperature resistant component 14 isolates the cover plate body 11 from the electrode plate 122 in the positive electrode after the insulating component 13 softens at high temperature, and the other high-temperature resistant component 14 isolates the cover plate body 11 from the electrode plate 122 in the negative electrode, preventing the cover plate body 11 from contacting either electrode plate 122 in either electrode 12, thus preventing a short circuit in the battery cell. The insulating component 13 is made of existing medium-low plastic, therefore it will not be described further in this embodiment.

[0063] When high-temperature resistant components 14 are provided on both sides of the cover plate body 11 in the thickness direction, the insulating component 13 is provided with a high-temperature resistant component 14 on the side facing the cover plate body 11 and on the side facing the electrode plate 122. The high-temperature resistant component 14 on the side of the insulating component 13 facing the cover plate body 11 has a plate-like structure and is provided between the insulating component 13 and the cover plate body 11. It is used to isolate the cover plate body 11 from the electrode plate 122 of the two electrodes after the insulating component 13 softens at high temperature, so as to prevent the cover plate body 11 from contacting the electrode plate 122 of either electrode 12 and causing a short circuit in the battery cell. Two high-temperature resistant components 14 are provided on the side of the insulating component 13 facing the electrode plate 122. One high-temperature resistant component 14 isolates the cover plate body 11 from the electrode plate 122 in the positive electrode after the insulating component 13 softens at high temperature, and the other high-temperature resistant component 14 isolates the cover plate body 11 from the electrode plate 122 in the negative electrode, preventing the cover plate body 11 from contacting either of the two electrode plates 122 and causing a short circuit in the battery cell. The high-temperature resistant components 14 on both sides of the cover plate body 11 in the thickness direction form double protection, further preventing the cover plate body 11 from contacting either of the two electrode plates 122 and causing a short circuit in the battery cell.

[0064] Specifically, in a single-sided monopole configuration, such as Figure 10 As shown, when the high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the cover plate body 11, the high-temperature resistant component 14 has a plate-like structure and is disposed between the insulating component 13 and the cover plate body 11. It is used to isolate the cover plate body 11 from the electrode plate 122 after the insulating component 13 softens at high temperature, so as to prevent the cover plate body 11 from contacting the electrode plate 122 of the electrode 12 and causing a short circuit in the battery cell.

[0065] When the high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the electrode plate 122 (not shown in the figure), there is one high-temperature resistant component 14, which is used to isolate the cover plate body 11 from the electrode plate 122 after the insulating component 13 softens at high temperature, so as to prevent the cover plate body 11 from contacting the electrode plate 122 of the electrode 12 and causing a short circuit in the cell.

[0066] When high-temperature resistant components 14 are provided on both sides of the cover plate body 11 in the thickness direction, the insulating component 13 has a high-temperature resistant component 14 on the side facing the cover plate body 11 and on the side facing the electrode plate 122. The high-temperature resistant component 14 on the side of the insulating component 13 facing the cover plate body 11 has a plate-like structure and is disposed between the insulating component 13 and the cover plate body 11. It is used to isolate the cover plate body 11 from the electrode plate 122 after the insulating component 13 softens at high temperature, preventing the cover plate body 11 from contacting the electrode plate 122 and causing a short circuit in the battery cell. The high-temperature resistant component 14 on the side of the insulating component 13 facing the electrode plate 122 is used to isolate the cover plate body 11 from the electrode plate 122 after the insulating component 13 softens at high temperature, providing double protection to prevent the cover plate body 11 from contacting the electrode plate 122 and causing a short circuit in the battery cell. The high-temperature resistant components 14 on both sides of the cover plate body 11 in the thickness direction form a double protection, further preventing the cover plate body 11 from contacting the electrode plate 122 and causing a short circuit in the battery cell.

[0067] In view of this, the cover plate assembly 10 in this embodiment is designed to enhance the heat resistance of the cell by introducing a high-temperature resistant component 14, thereby reducing the risk of short circuits between the positive and negative electrodes under high-temperature conditions. The high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C. This design ensures that even if the insulation component 13 softens and is crushed by the terminal plate 122 under high-temperature conditions, the high-temperature resistant component 14 can maintain its structural integrity and isolate the terminal plate 122 from the cover plate body 11. That is, due to the characteristic that the high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C, even if the insulation component 13 softens at high temperatures, the high-temperature resistant component 14 can still effectively isolate the terminal plate 122 of the terminal 12 from the cover plate body 11, preventing short circuits between the positive and negative electrodes. Under single-cell heating tests or other high-temperature conditions, the presence of the high-temperature resistant component 14 significantly reduces the risk of thermal runaway and improves the overall safety of the cell. The high-temperature stability of the high-temperature resistant component 14 ensures the structural integrity of the cover plate assembly 10 under extreme conditions and avoids insulation failure caused by the softening of the insulating component 13.

[0068] In some embodiments, the high-temperature resistant component 14 is made of polyimide (PI). Polyimide (PI) is a polymer material with excellent heat resistance, and its melting point and thermal stability are much higher than those of traditional polypropylene (PP). PI material can maintain its structural integrity under high-temperature conditions and is not easily melted or carbonized, making it an ideal high-temperature insulating material in battery cover assemblies. Using polyimide as the material for the high-temperature resistant component 14 can effectively improve the safety and reliability of the cover assembly 10 in high-temperature environments. Specifically, the high melting point of PI material ensures that even under cell heating tests or other extreme high-temperature conditions, the high-temperature resistant component 14 can still effectively isolate the electrode plate 122 from the cover body 11, preventing short circuits between the positive and negative electrodes. In addition, polyimide also has excellent mechanical strength and electrical insulation properties, which further enhances the overall performance of the cover assembly 10. By adopting PI material, the cover assembly 10 can not only maintain its structure and function at high temperatures, but also provide stable insulation during long-term use, significantly reducing the risk of thermal runaway of the cell and improving the overall safety and service life of the cell.

[0069] It should be noted that the high-temperature resistant component 14 will not melt and / or carbonize at any temperature less than or equal to 550°C. This characteristic allows the high-temperature resistant component 14 to maintain its structural integrity and insulation performance under high-temperature conditions. Choosing a material with such a high melting point (such as polyimide) as the material for the high-temperature resistant component 14 ensures that even if the battery cell undergoes high-temperature testing or accidental overheating, the high-temperature resistant component 14 can still effectively isolate the terminal plate 122 from the cover plate body 11, preventing short circuits between the positive and negative electrodes. This design significantly improves battery safety, especially under high-temperature or thermal runaway conditions. By using a material that will not melt and / or carbonize at any temperature less than or equal to 550°C, the cover plate assembly 10 can provide reliable protection under extreme conditions, reducing the risk of cell explosion or damage and ensuring long-term stable operation of the battery.

[0070] It should be noted that the thickness of the high-temperature resistant component 14 is less than or equal to 0.3 mm, and / or greater than or equal to 0.02 mm. The thickness of the high-temperature resistant component 14 is designed between 0.02 mm and 0.3 mm to provide sufficient heat resistance and insulation performance. The thickness of the high-temperature resistant component 14 needs to provide sufficient protection while minimizing its impact on the overall size and weight of the battery. A thinner high-temperature resistant component 14 can be used in conjunction with the insulator 13 to achieve a lightweight overall structure. The thickness of the insulator 13 can be adjusted according to specific electrical requirements to ensure insulation performance under normal operating conditions. Due to the high material cost of the high-temperature resistant component 14, it cannot completely replace the function of the insulator 13; therefore, its thickness is usually designed to be as thin as possible to reduce costs. By rationally configuring the thicknesses of the high-temperature resistant component 14 and the insulator 13, material usage and cost can be optimized while meeting safety and performance requirements.

[0071] In some embodiments, the insulation resistance of the high-temperature component 14 is greater than or equal to 200 mΩ at a high voltage of 500 V. This requirement sets specific technical standards for material selection and thickness design to ensure safety and reliability under high-voltage conditions. Specifically, the material of the high-temperature component 14 must possess excellent insulation and heat resistance properties to effectively prevent current leakage in high-voltage environments. Material selection typically includes high-performance polymers such as polyimide and polyetheretherketone (PEEK), which maintain stable insulation properties under high temperature and high pressure. Thickness design is also a key factor. While the thickness of the high-temperature component 14 is typically between 0.02 mm and 0.3 mm, in high-voltage applications, the thickness may need to be adjusted according to specific electrical requirements to ensure the required insulation resistance is achieved. Thicker materials generally provide better insulation performance, but a balance needs to be struck between thickness and flexibility to avoid compromising the overall lightweight and compact design. Furthermore, manufacturing processes and surface treatments also affect insulation performance. High-quality manufacturing processes can reduce defects and inhomogeneities in the material, thereby improving the insulation resistance.

[0072] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 5 This is a cross-sectional structural diagram of a cover plate assembly provided in an embodiment of this application. Figure 6 Provided for the embodiments of this application Figure 5 Enlarged view at point A. The projection of the high-temperature resistant component 14 in the thickness direction of the cover plate body 11 covers the edge of the pole plate 122.

[0073] Specifically, the outer edge dimension of the high-temperature resistant component 14 is larger than that of the outer edge dimension of the electrode plate 122. This design ensures that even if the insulating component 13 softens at high temperatures, the high-temperature resistant component 14 can still effectively isolate the cover plate body 11 and the electrode plate 122, preventing short circuits between the positive and negative electrodes. The portion of the high-temperature resistant component 14 extending beyond the electrode plate 122 not only provides physical isolation but also increases the tolerance space during thermal expansion or material deformation, ensuring that the high-temperature resistant component 14 can continue to perform its isolation function under extreme conditions. In this embodiment, by using the high-temperature resistant component 14 made of a high-melting-point material, the cover plate assembly 10 can maintain its structural integrity and electrical isolation performance in high-temperature environments. This design significantly reduces the risk of thermal runaway and short circuits, improving the overall safety of the battery cell.

[0074] In some embodiments, please refer to Figure 7 , Figure 7 Provided for the embodiments of this application Figure 5Enlarged view at point B. The high-temperature resistant component 14 has a second mounting hole 142 through which the pole body 121 passes. The second mounting hole 142 is aligned with the first mounting hole 111, and the diameter of the second mounting hole 142 is larger than the diameter of the first mounting hole 111.

[0075] It should be noted that a seal must be maintained between the cover plate body 11 and the pole post body 121 of the pole post 12. By ensuring that the diameter of the second mounting hole 142 is larger than that of the first mounting hole 111, the high-temperature resistant component 14 can be effectively prevented from adversely affecting the seal between the cover plate body 11 and the pole post body 121 of the pole post 12. If the diameter of the second mounting hole 142 is smaller than that of the first mounting hole 111, part of the high-temperature resistant component 14 may be placed between the cover plate body 11 and the pole post body 121 of the pole post 12, thus affecting the sealing effect. This design not only ensures the integrity and functionality of the structure, but also avoids sealing failure caused by material interference, improving the reliability and safety of the cover plate assembly 10 in practical applications. By optimizing the size and position of the first mounting hole 111 and the second mounting hole 142, the stability and sealing performance of the cover plate assembly 10 under high temperature and high pressure conditions are ensured, providing a solid guarantee for the safe operation of the battery cell.

[0076] In some embodiments, such as Figure 3 , Figure 5 , Figure 7 As shown, the cover plate assembly 10 also includes a sealing element 15, which includes a first sealing portion 151 and a second sealing portion 152 connected together. The first sealing portion 151 passes through the first mounting hole 111 and the second mounting hole 142 and is disposed between the cover plate body 11 and the pole post body 121. The second sealing portion 152 is disposed between the cover plate body 11 and the pole post body 122, and the outer diameter of the second sealing portion 152 is smaller than the diameter of the second mounting hole 142. This structural design ensures that the sealing element 15 can effectively seal the gap between the cover plate body 11 and the pole post 12. Specifically, the first sealing portion 151 is responsible for sealing the gap between the cover plate body 11 and the pole post body 121, while the second sealing portion 152 seals the gap between the cover plate body 11 and the pole post body 122. Since the diameter of the second mounting hole 142 is larger than the diameter of the first mounting hole 111, the high-temperature resistant component 14 will not affect the sealing function of the first sealing portion 151.

[0077] Wherein, the inner wall 141 of the second mounting hole 142 of the high-temperature resistant component 14 has a gap 18 with the sealing component 15, and the inner wall 141 of the second mounting hole 142 of the high-temperature resistant component 14 does not contact the outer wall of the sealing component 15, which can prevent the inner wall 141 of the second mounting hole 142 of the high-temperature resistant component 14 from entering the sealing interface between the cover plate body 11 and the sealing component 15 (i.e., as shown in the figure). Figure 7The contact surface between the cover plate body 11 and the sealing element 15 (as shown) ensures that the added high-temperature resistant element 14 does not affect the sealing interface between the cover plate body 11 and the sealing element 15, thus guaranteeing the sealing performance between the cover plate body 11 and the sealing element 15.

[0078] It should be noted that the outer diameter of the second sealing part 152 is smaller than the diameter of the second mounting hole 142. This design detail further limits the diameter of the second mounting hole 142, ensuring that the high-temperature resistant component 14 will not interfere with the sealing effect of the second sealing part 152 on the gap between the cover plate body 11 and the electrode plate 122. If the outer diameter of the second sealing part 152 is larger than the diameter of the second mounting hole 142, the high-temperature resistant component 14 may be placed between the cover plate body 11 and the electrode plate 122, thereby affecting the sealing effect of the sealing component 15 on the gap between the cover plate body 11 and the electrode 12. Through this optimized design, the sealing performance of the cover plate assembly 10 under high temperature and high pressure conditions is significantly improved, ensuring the safety and reliability of the battery cell.

[0079] In some embodiments, such as Figure 2 and Figure 3 As shown, the cover plate assembly 10 also includes a welding block 16 and a third insulating member 17. The welding block 16 is located on the side of the cover plate body 11 opposite to the insulating member 13 and surrounds the connecting pole body 121. The third insulating member 17 is disposed between the welding block 16 and the cover plate body 11, providing initial insulation and buffering. At least one side of the third insulating member 17 in its thickness direction is provided with a second high-temperature resistant member 19 to ensure effective isolation between the welding block 16 and the cover plate body 11.

[0080] It is understood that the third insulating member 17 has a second high-temperature resistant member 19 provided on at least one side of its thickness direction, that is, the second high-temperature resistant member 19 is provided on the side of the third insulating member 17 facing the welding block 16 (see [link]). Figure 9 , Figure 9 (This is an exploded view of another cover plate assembly provided in an embodiment of this application). Alternatively, a second high-temperature resistant member 19 is provided on the side of the third insulating member 17 facing the cover plate body 11, or a second high-temperature resistant member 19 is provided on both sides of the third insulating member 17 in the thickness direction. The second high-temperature resistant member 19 is made of the same material as the high-temperature resistant member 14, therefore the second high-temperature resistant member 19 has the same characteristics as the high-temperature resistant member 14. Since the second high-temperature resistant member 19 also has higher heat resistance, even if the third insulating member 17 may soften or deform at high temperatures, the second high-temperature resistant member 19 can still maintain its structural integrity, ensuring the isolation effect between the welded block 16 and the cover plate body 11. This multi-layer insulation design not only improves the thermal stability and safety of the cover plate assembly 10, but also enhances its reliability under extreme working conditions. Through reasonable material selection and structural design, the cover plate assembly 10 can maintain excellent performance in high-temperature environments, ensuring the safe operation of the battery cell.

[0081] It should be noted that in the design of the cover plate assembly 10, the arrangement of the second high-temperature resistant component 19 provides flexible insulation protection to prevent short-circuit risks under high-temperature conditions. Based on this design concept, the arrangement of the second high-temperature resistant component 19 can also be adjusted according to different needs to enhance the overall insulation effect.

[0082] Specifically, a second high-temperature resistant member 19 is provided on the side of the third insulating member 17 facing the cover plate body 11. In this case, the second high-temperature resistant member 19 is located between the third insulating member 17 and the cover plate body 11. Its main function is to provide additional insulation protection and prevent direct contact between the welded block 16 and the cover plate body 11 when the third insulating member 17 may soften under high-temperature conditions. Since the second high-temperature resistant member 19 will not melt and / or carbonize at any temperature less than or equal to 550°C, the second high-temperature resistant member 19 can still maintain its structural integrity and ensure the insulation effect even if the third insulating member 17 loses some of its insulation properties at high temperatures. This arrangement is particularly suitable for occasions where additional protection is required on one side of the cover plate body 11.

[0083] Specifically, a high-temperature resistant element 14 is provided on the side of the third insulating element 17 facing the welding block 16. In this case, a second high-temperature resistant element 19 is located between the third insulating element 17 and the welding block 16. Its design purpose is to prevent direct contact between the welding block 16 and the third insulating element 17 under high-temperature conditions, thereby protecting the cover plate body 11 from the effects of heat conduction. Due to the characteristic that the second high-temperature resistant element 19 will not melt and / or carbonize at any temperature less than or equal to 550°C, even if the third insulating element 17 softens at high temperatures, the second high-temperature resistant element 19 can still effectively isolate the welding block 16 from the cover plate body 11. This arrangement is suitable for situations where additional protection is required on the side of the welding block 16.

[0084] Through these two configurations, the second high-temperature resistant component 19 can provide flexible and effective insulation protection according to specific application requirements, ensuring the safety and reliability of the cover assembly 10 in high-temperature environments. Combined with the multi-protection design of the second high-temperature resistant component 19, the performance of the entire cover assembly 10 under extreme conditions is significantly improved.

[0085] Please refer to the relevant section. Figure 8 , Figure 8 This is an exploded view of a battery cell provided in an embodiment of this application. The battery cell provided in this application includes a housing 30, an electrode assembly 20, and a cover plate assembly 10 as described in any of the above embodiments. The housing 30 has an accommodating space 31; the electrode assembly 20 is disposed within the accommodating space 31; and the cover plate assembly 10 covers the accommodating space 31. This battery cell can possess all the technical features and beneficial effects of the cover plate assembly 10 described above, which will not be elaborated further here.

[0086] Accordingly, embodiments of this application also provide a new energy vehicle, which includes a vehicle body and the aforementioned battery cells, with the battery cells mounted on the vehicle body. This new energy vehicle can possess all the technical features and beneficial effects of the aforementioned battery cells, which will not be elaborated upon here.

[0087] Accordingly, embodiments of this application also provide an energy storage cabinet, which includes a cabinet body and the aforementioned battery cells, with the battery cells disposed within the accommodating space of the cabinet body. This energy storage cabinet can possess all the technical features and beneficial effects of the aforementioned battery cells, which will not be elaborated upon here.

[0088] Accordingly, embodiments of this application also provide an energy storage system comprising at least two of the aforementioned energy storage cabinets. This energy storage system can possess all the technical features and beneficial effects of the aforementioned energy storage cabinets, which will not be elaborated upon here.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The energy storage system cover plate assembly, battery cell, and energy storage system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly, characterized by The cover plate assembly (10) comprises: a cover plate body (11); a pole column (12) comprising a pole column body (121) and a pole column plate body (122), the pole column body (121) being arranged on the pole column plate body (122); an insulating piece (13) arranged between the cover plate body (11) and the pole column plate body (122); a high-temperature-resistant piece (14) arranged between the cover plate body (11) and the pole column plate body (122); the high-temperature-resistant piece (14) does not melt and / or carbonize at any temperature less than or equal to 550°C.

2. The cover plate assembly of claim 1, wherein, The material of the high-temperature-resistant piece (14) is polyimide.

3. The cover plate assembly of claim 1, wherein, The thickness of the high-temperature-resistant piece (14) is less than or equal to 0.3mm; and / or, the thickness of the high-temperature-resistant piece (14) is greater than or equal to 0.02mm.

4. The cover plate assembly of claim 1, wherein, The insulation resistance of the high-temperature-resistant piece (14) is greater than or equal to 200mΩ under high voltage 500v.

5. The cover plate assembly of claim 1, wherein, The projection of the high-temperature-resistant piece (14) in the thickness direction of the cover plate body (11) covers the edge of the pole column plate body (122).

6. The cover plate assembly of claim 1, wherein, The high-temperature-resistant piece (14) is located between the cover plate body (11) and the insulating piece (13).

7. The cover plate assembly of claim 1, wherein, The high-temperature-resistant piece (14) is located between the insulating piece (13) and the pole column plate body (122).

8. The cover plate assembly of claim 6 or 7, wherein, The cover plate body (11) has at least one first assembly hole (111) for the pole column body (121) to pass through, and the high-temperature-resistant piece (14) has at least one second assembly hole (142) for the pole column body (121) to pass through.

9. The cover plate assembly of claim 8, wherein, The cover plate assembly (10) further comprises a sealing piece (15) comprising a first sealing part (151) and a second sealing part (152) connected together, the first sealing part (151) passing through the first assembly hole (111) and the second assembly hole (142) and being arranged between the cover plate body (11) and the pole column body (121), and the second sealing part (152) being arranged between the cover plate body (11) and the pole column plate body (122).

10. The cover plate assembly of claim 9, wherein, There is a gap (18) between the inner wall (141) of the second assembly hole (142) of the high-temperature-resistant piece (14) and the sealing piece (15).

11. An electric cell characterized by The electric core comprises: a shell (30); an electrode assembly (20) arranged in the shell (30); the cover plate assembly (10) according to any one of claims 1 to 10 is arranged at an opening of the shell (30); wherein the shell (30) and the cover plate body (11) of the cover plate assembly (10) form a containing space (31), and the pole column plate body (122), the insulating piece (13) and the high-temperature-resistant piece (14) of the cover plate assembly (10) are located in the containing space (31).

12. A new energy vehicle, characterized in that, The new energy vehicle comprises: a vehicle body; the electric core according to claim 11 is arranged on the vehicle body.

13. An energy storage cabinet characterized by, The energy storage cabinet comprises: a cabinet body; the electric core according to claim 11 is arranged in a containing space of the cabinet body.

14. An energy storage system characterized by, The energy storage system comprises: at least two energy storage cabinets according to claim 13.

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