Cover plate assembly, battery cell and new energy vehicle

Abstract

A cover plate assembly, a battery cell and a new energy vehicle. The cover plate assembly comprises a cover plate main body (11), a terminal post (12), an insulating member (13) and a first high-temperature resistant member (14), wherein the terminal post (12) comprises a terminal post main body (121) and a terminal post plate body (122), the terminal post main body (121) being arranged on the terminal post plate body (122); the insulating member (13) is arranged between the cover plate main body (11) and the terminal post plate body (122); and the first high-temperature resistant member (14) is arranged between the cover plate main body (11) and the terminal post plate body (122), and the first high-temperature resistant member (14) is not subjected to melting or / and carbonization at any temperature less than or equal to 550°C.

Description

Cover plate components, battery cells and new energy vehicles

[0001] This disclosure claims priority to Chinese Patent Application No. 202423273365.X, filed on December 27, 2024, entitled “Cover plate assembly, battery cell, new energy vehicle, energy storage cabinet and energy storage system”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a cover plate assembly, a battery cell, and a new energy vehicle. Background Technology

[0003] Individual battery cells can directly reduce the cost per watt-hour of a battery. However, as the size increases, the structural strength of the cell decreases. Under certain special safety conditions, internal insulation problems of the cell will also become apparent. For example, during the heating test of a single battery cell, the internal insulation components of the relevant technology are generally made of PP (Polypropylene). While it has structural strength at room temperature, due to its low melting point, it is not heat-resistant enough under high-temperature conditions, softens, and causes a short circuit between the positive and negative electrodes of the cell, exacerbating thermal runaway and leading to cell explosion. Summary of the Invention

[0004] The following is an overview of the detailed description of this disclosure. This overview is not intended to limit the scope of the claims.

[0005] The purpose of this disclosure is to provide a cover plate assembly that reduces the risk of positive and negative electrode contact at high temperatures by increasing the heat resistance of the battery cell; this disclosure also provides a battery cell; this disclosure also provides a new energy vehicle.

[0006] In a first aspect, embodiments of this disclosure provide a cover plate assembly, the cover plate assembly comprising:

[0007] Cover plate body;

[0008] 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.

[0009] An insulating component is disposed between the cover plate body and the pole plate body;

[0010] The first high-temperature resistant component is disposed between the cover plate body and the pole plate body;

[0011] The first high-temperature resistant component will not melt or carbonize at any temperature less than or equal to 550°C.

[0012] In some embodiments, the first high-temperature resistant component is made of polyimide.

[0013] In some embodiments, the thickness of the first high-temperature resistant component is less than or equal to 0.3 mm.

[0014] In some embodiments, the thickness of the first high-temperature resistant component is greater than or equal to 0.02 mm.

[0015] In some embodiments, the insulation resistance of the first high-temperature resistant component is greater than or equal to 200mΩ under a high voltage of 500V.

[0016] In some embodiments, the projection of the first high-temperature resistant member in the thickness direction of the cover plate body covers the edge of the pole plate body.

[0017] In some embodiments, the first high-temperature resistant component is located between the cover plate body and the insulating component.

[0018] In some embodiments, the first high-temperature resistant component is located between the insulating component and the pole plate.

[0019] In some embodiments, the cover plate body has at least one first mounting hole for the pole body to pass through, and the first high-temperature resistant component has at least one second mounting hole for the pole body to pass through.

[0020] 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.

[0021] In some embodiments, there is a gap between the inner wall of the second mounting hole and the seal.

[0022] Secondly, this disclosure also provides a battery cell, the battery cell comprising:

[0023] case;

[0024] Electrode assemblies are disposed within the housing;

[0025] In any of the above embodiments, the cover plate assembly is disposed at the opening of the housing;

[0026] The housing and the cover plate body of the cover plate assembly form an accommodating space, and the pole plate, insulating component and first high-temperature resistant component of the cover plate assembly are located within the accommodating space.

[0027] Thirdly, this disclosure also provides a new energy vehicle, the new energy vehicle comprising:

[0028] Vehicle body;

[0029] The aforementioned battery cell is mounted on the vehicle body.

[0030] This disclosure provides a cover plate assembly, which includes a cover plate body, an electrode post, an insulating component, and a first high-temperature resistant component. The electrode post includes an electrode post body and an electrode post plate, with the electrode post body disposed on the electrode post plate. The insulating component is disposed between the cover plate body and the electrode post plate. The first high-temperature resistant component is disposed between the cover plate body and the electrode post plate. The first high-temperature resistant component will not undergo either melting or carbonization at any temperature less than or equal to 550°C. Thus, by introducing the first high-temperature resistant component, the heat resistance of the battery cell is enhanced, and the risk of short circuit between the positive and negative electrodes under high-temperature conditions is reduced.

[0031] After reading and understanding the accompanying diagrams and detailed descriptions, other aspects can be understood. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this disclosure, 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 disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 is a three-dimensional structural diagram of the cover plate assembly provided in an embodiment of this disclosure;

[0034] Figure 2 is an exploded structural diagram of a cover plate assembly provided in an embodiment of this disclosure;

[0035] Figure 3 is an exploded structural diagram of another cover plate assembly provided in an embodiment of this disclosure;

[0036] Figure 4 is a schematic diagram of the overall structure of the pole provided in the embodiment of this disclosure;

[0037] Figure 5 is a cross-sectional structural diagram of a cover plate assembly provided in an embodiment of this disclosure;

[0038] Figure 6 is an enlarged structural diagram of point A in Figure 5 provided in an embodiment of this disclosure;

[0039] Figure 7 is an enlarged structural diagram of point B in Figure 5 provided in an embodiment of this disclosure;

[0040] Figure 8 is a schematic diagram of the exploded structure of the battery cell provided in the embodiment of this disclosure;

[0041] Figure 9 is an exploded structural diagram of another cover plate assembly provided in an embodiment of this disclosure;

[0042] Figure 10 is an exploded structural diagram of the cover plate assembly of the single-sided single pole column provided in the embodiment of this disclosure;

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Battery cell; 10-Cover plate assembly; 11-Cover plate body; 111-First assembly hole; 12-Terminal post; 121-Terminal post body; 122-Terminal post plate; 13-Insulator; 14-First 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-Reserved gap; 19-Second high-temperature resistant component;

[0045] 20 - Electrode assembly;

[0046] 30 - Housing; 31 - Accommodation space. Embodiments of the present invention

[0047] The technical solutions of the embodiments of this disclosure 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 disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0048] It should be understood that although the terms "first," "second," etc., may be used in this document to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another.

[0049] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams illustrating exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this disclosure and therefore should not be used to limit the scope of protection of this disclosure.

[0050] With the continuous development of battery technology, increasing the capacity of individual battery cells has become a 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, and under certain special safety conditions, the insulation problems inside the cells may become more prominent.

[0051] Polypropylene (PP) can be used as the insulation material inside the battery cell. This material has 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 may cause 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 leading to an explosion and posing a serious safety hazard.

[0052] In related technologies, the high-temperature softening of the insulating material inside the top cover can lead to 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 electrode post 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.

[0053] In view of the above, this disclosure provides a cover plate assembly. Please refer to Figures 1, 2, and 3 together. Figure 1 is a three-dimensional structural diagram of the cover plate assembly provided in this disclosure, Figure 2 is an exploded structural diagram of one cover plate assembly provided in this disclosure, and Figure 3 is an exploded structural diagram of another cover plate assembly provided in this disclosure. The cover plate assembly 10 of this disclosure is used to increase the heat resistance of the battery cell 1 and reduce the risk of positive and negative electrode contact at high temperatures, thereby solving at least part of the above-mentioned technical problems.

[0054] The cover plate assembly 10 includes a cover plate body 11, an electrode post 12, an insulating component 13, and a first high-temperature resistant component 14. 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. The first high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C. That is, at any temperature less than or equal to 550°C, the first high-temperature resistant component 14 will not melt, nor will it carbonize, nor will it undergo simultaneous melting and carbonization. The melting phenomenon of the first high-temperature resistant component 14 refers to the process by which the first high-temperature resistant component 14 changes from a solid to a liquid state after being heated to its melting point, and can re-solidify into a solid state after cooling. The carbonization phenomenon of the first high-temperature resistant component 14 refers to the process in which the first high-temperature resistant component 14 is heated in an oxygen-deficient or inert atmosphere, and eventually generates solid residues with high carbon content (such as carbon black or coke). The phenomenon of simultaneous melting and carbonization refers to the phenomenon in which melting and carbonization occur simultaneously, regardless of whether the atmosphere is oxygen-containing, oxygen-deficient, or inert.

[0055] In some embodiments, the cover plate body 11 has a first mounting hole 111. The electrode post body 121 passes through the first mounting hole 111, and the electrode post plate 122 is located on one side of the cover plate body 11, surrounds the electrode post body 121, and is connected to the electrode post body 121. The electrode post plate 122 is electrically connected to the electrode assembly 20 via an adapter piece, or the electrode post plate 122 is directly electrically connected to the electrode assembly 20. An insulating member 13 is disposed on one side of the cover plate body 11, and at least partially disposed between the electrode post plate 122 and the cover plate body 11; a first high-temperature resistant member 14 is disposed on at least one side of the insulating member 13 in its thickness direction, so as to isolate the cover plate body 11 from the electrode post plate 122, and the first high-temperature resistant member 14 will not melt or carbonize at any temperature less than or equal to 550°C. The thickness direction of the insulating member 13 refers to the stacking direction of the cover plate body 11 and the insulating member 13.

[0056] In some embodiments, as shown in Figures 2 and 3, 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 the number of terminals 12 is two, 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.

[0057] In some embodiments, please refer to FIG10, which is an exploded structural schematic diagram of a single-sided single-pole cover plate assembly provided in an embodiment of the present disclosure. The cover plate assembly 10 is provided with only one pole 12, and the cover plate body 11 has a first mounting hole 111, through which the pole 12 passes.

[0058] Please refer to Figure 4, which is a schematic diagram of the overall structure of the electrode post provided in this embodiment. 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 so 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, surrounds the electrode post body 121, and is connected to the electrode post body 121 for electrical connection with the electrode assembly 20. The electrode post plate 122 is located on either side of the thickness direction of the cover plate body 11, that is, the electrode post plate 122 and the cover plate body 11 are arranged along the thickness direction of the cover plate body 11, the electrode post plate 122 surrounds the electrode post body 121, and can support the electrode post body 121. The thickness direction of the cover plate body 11 refers to the stacking direction of the cover plate body 11 and the insulating component 13.

[0059] It is understood that the first high-temperature resistant component 14 is disposed on at least one side of the insulating component 13 in its thickness direction. That is, it can be disposed on the side of the insulating component 13 facing the cover plate body 11, or on the side of the insulating component 13 facing the pole plate body 122, or the first high-temperature resistant component 14 can be disposed on both sides of the insulating component 13 in its thickness direction to provide double protection.

[0060] Specifically, in the single-sided bipolar configuration, as shown in Figure 2, when the first high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the cover plate body 11, the first 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 pole plate 122 of the two poles 12 after the insulating component 13 softens at high temperature, so as to prevent the cover plate body 11 from contacting the pole plate 122 of any pole 12, which would cause the cell 1 to short circuit. As shown in Figure 3, when the first 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, the number of the first high-temperature resistant component 14 is set to two. After the insulating component 13 softens at high temperature, one first high-temperature resistant component 14 is used to isolate the cover plate body 11 from the electrode plate 122 in the positive electrode, and the other first high-temperature resistant component 14 is used to isolate 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, which would cause a short circuit in the cell 1. The insulating component 13 can be made of plastic, so it will not be described in detail in this embodiment.

[0061] When the first high-temperature resistant element 14 is provided on both sides of the insulation element 13 in the thickness direction, the first high-temperature resistant element 14 is provided on the side of the insulation element 13 facing the cover plate body 11, and the first high-temperature resistant element 14 is also provided on the side of the insulation element 13 facing the electrode plate 122. The first high-temperature resistant element 14 on the side of the insulation element 13 facing the cover plate body 11 has a plate-like structure and is provided between the insulation element 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 insulation element 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 cell 1. Two first high-temperature resistant components 14 are provided on the side of the insulating component 13 facing the electrode plate 122. After the insulating component 13 softens at high temperature, one first high-temperature resistant component 14 isolates the cover plate body 11 from the electrode plate 122 in the positive electrode, and the other first 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, which could cause a short circuit in the cell 1. The first high-temperature resistant components 14 on both sides of the insulating component 13 in the thickness direction form double protection, which can prevent the cover plate body 11 from contacting either of the two electrode plates 122, which could cause a short circuit in the cell 1.

[0062] Specifically, in the single-sided single-pole scheme, as shown in Figure 10, when the first high-temperature resistant component 14 is disposed on the side of the insulating component 13 facing the cover plate body 11, the first 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 pole plate 122 after the insulating component 13 softens at high temperature, so as to prevent the cover plate body 11 from contacting the pole plate 122 of the pole 12 and causing a short circuit in the cell 1.

[0063] When the first 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 first high-temperature resistant component 14. This first high-temperature resistant component 14 is used to isolate the cover plate body 11 from the electrode plate 122 after the insulating component 13 softens at high temperature, and to prevent the cover plate body 11 from contacting the electrode plate 122 of the electrode 12, which would cause a short circuit in the cell 1.

[0064] When a first high-temperature resistant element 14 is provided on both sides of the insulation element 13 in the thickness direction, the first high-temperature resistant element 14 is provided on the side of the insulation element 13 facing the cover plate body 11, and also on the side of the insulation element 13 facing the electrode plate 122. The first high-temperature resistant element 14 on the side of the insulation element 13 facing the cover plate body 11 has a plate-like structure and is provided between the insulation element 13 and the cover plate body 11. This first high-temperature resistant element 14 is used to isolate the cover plate body 11 from the electrode plate 122 after the insulation element 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 1. The provision of one first high-temperature resistant element 14 on the side of the insulation element 13 facing the electrode plate 122 provides double protection against short circuits in the battery cell 1 caused by contact between the cover plate body 11 and the electrode plate 122 after the insulation element 13 softens at high temperature. The first high-temperature resistant components 14 on both sides of the insulation component 13 in the thickness direction form a double protection, which can prevent the cover plate body 11 from contacting the electrode plate body 122 and causing the cell 1 to short circuit.

[0065] In this embodiment, the cover plate assembly 10 enhances the heat resistance of the cell 1 by introducing a first high-temperature resistant component 14, reducing the risk of short circuits between the positive and negative electrodes under high-temperature conditions. The first high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C. Under high-temperature conditions, the insulating component 13 may soften and be crushed by the terminal plate 122. In this case, the first high-temperature resistant component 14 can maintain its structural integrity and isolate the terminal plate 122 from the cover plate body 11. That is, because the first high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C, even if the insulating component 13 softens at high temperatures, the first 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. During single-cell heating tests or other high-temperature conditions, the presence of the first high-temperature resistant component 14 reduces the risk of thermal runaway and improves the overall safety of the cell 1. The high-temperature stability of the first high-temperature resistant component 14 ensures the structural integrity of the cover assembly 10 under extreme conditions, preventing insulation failure due to softening of the insulating component 13. A high-temperature environment refers to a temperature of the cover assembly 10 that is above the melting point of the insulating component 13 but below or equal to 550°C. Extreme conditions refer to a temperature of the cover assembly 10 that is above 200°C but below 550°C.

[0066] In some embodiments, the first 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 polypropylene (PP). PI material can maintain its structural integrity in high-temperature environments and is not easily melted or carbonized. Using polyimide as the material of the first 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 allows the first high-temperature resistant component 14 to effectively isolate the electrode plate 122 from the cover body 11 under heating tests of the battery cell 1 or other extreme high-temperature conditions, preventing short circuits between the positive and negative electrodes. In addition, polyimide also has excellent mechanical strength and electrical insulation properties, enhancing the overall performance of the cover assembly 10. By using 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 battery cell 1 and improving the overall safety and service life of the battery cell 1. High temperature refers to a temperature above 200℃ but below 550℃.

[0067] The first high-temperature resistant component 14 will not melt or carbonize at any temperature less than or equal to 550°C. This characteristic allows the first high-temperature resistant component 14 to maintain its structural integrity and insulation performance under high-temperature conditions. Choosing a high-melting-point material (such as polyimide) as the material for the first high-temperature resistant component 14 ensures that, even if the cell 1 undergoes high-temperature testing or accidental overheating, the first high-temperature resistant component 14 can still effectively isolate the electrode plate 122 from the cover plate body 11, preventing short circuits between the positive and negative electrodes and improving battery safety. In the event of high temperature or thermal runaway, by using a material that will not melt 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 1 explosion or damage, and enabling the battery to operate stably for a long period. A high-melting-point material refers to a material with a melting point above 550°C.

[0068] In some embodiments, the thickness of the first high-temperature resistant component 14 is less than or equal to 0.3 mm, that is, the maximum thickness of the first high-temperature resistant component 14 is 0.3 mm.

[0069] In some embodiments, the thickness of the first high-temperature resistant component 14 is greater than or equal to 0.02 mm, that is, the minimum thickness of the first high-temperature resistant component 14 is 0.02 mm.

[0070] In some embodiments, the thickness of the first high-temperature resistant component 14 is less than or equal to 0.3 mm, and the thickness of the first high-temperature resistant component 14 is greater than or equal to 0.02 mm. That is, the thickness of the first high-temperature resistant component 14 is between 0.02 mm and 0.3 mm to provide sufficient heat resistance and insulation properties. Specifically, the thickness of the first high-temperature resistant component 14 can be any value or a range between any two values ​​from 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, and 0.29mm. The thickness of the first high-temperature resistant component 14 needs to provide sufficient protection while minimizing its impact on the overall size and weight of the battery. A first high-temperature resistant component 14, with a thickness between 0.02 mm and 0.3 mm, can be used in conjunction with an insulating component 13 to achieve a lightweight overall structure. The thickness of the insulating component 13 can be adjusted according to specific electrical requirements to maintain insulation performance under normal operating conditions. Since the material cost of the first high-temperature resistant component 14 is relatively high, its thickness needs to be as thin as possible to reduce costs. By rationally configuring the thicknesses of the first high-temperature resistant component 14 and the insulating component 13, material usage costs can be controlled while meeting safety and performance requirements.

[0071] In some embodiments, the first high-temperature resistant component 14 has an insulation resistance greater than or equal to 200 mΩ at a high voltage of 500 V. Specifically, the material of the first high-temperature resistant component 14 can possess both insulation and heat resistance properties to effectively prevent current leakage in high-voltage environments. Material choices include high-performance polymers such as polyimide and polyether ether ketone (PEEK), which maintain stable insulation properties under high temperature and high pressure. Although the thickness of the first high-temperature resistant component 14 is between 0.02 mm and 0.3 mm, in high-voltage applications, the thickness of the first high-temperature resistant component 14 may need to be adjusted according to specific electrical requirements to achieve the required insulation resistance. A balance needs to be struck between the thickness of the first high-temperature resistant component 14 and the flexibility of its placement to avoid compromising the overall lightweight and compact structure.

[0072] In some embodiments, please refer to Figures 5 and 6. Figure 5 is a cross-sectional structural schematic diagram of a cover plate assembly provided in an embodiment of the present disclosure, and Figure 6 is an enlarged structural schematic diagram of point A in Figure 5 provided in an embodiment of the present disclosure. The projection of the first high-temperature resistant member 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 first high-temperature resistant component 14 is larger than the outer edge dimension of the electrode plate 122, so that even when the insulating component 13 softens at high temperatures, the first 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 first 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, allowing the first high-temperature resistant component 14 to continue to perform its isolation function under extreme conditions. In this embodiment, by using the first 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 reduces the risk of thermal runaway and short circuits, improving the overall safety of the cell 1.

[0074] In some embodiments, please refer to FIG7, which is an enlarged structural schematic diagram of section B in FIG5 provided in the embodiments of this disclosure. The first high-temperature resistant component 14 has a second mounting hole 142 through which the electrode 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] A sealed state needs to be maintained between the cover plate body 11 and the pole post body 121 of the pole post 12. The diameter of the second mounting hole 142 is larger than that of the first mounting hole 111, which can effectively prevent the first high-temperature resistant component 14 from adversely affecting the sealing performance 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 first 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, thereby affecting the sealing effect. The relationship between the diameters of the second mounting hole 142 and the first mounting hole 111 not only improves the integrity and functionality of the structure, but also avoids sealing failure caused by material interference, thereby improving the reliability and safety of the cover plate assembly 10 in practical applications. By controlling 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 improved, providing a guarantee for the safe operation of the battery cell 1.

[0076] In some embodiments, as shown in Figures 3, 5, and 7, the cover plate assembly 10 further includes a sealing element 15. The sealing element 15 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. 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 seals 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 first high-temperature resistant component 14 will not affect the sealing function of the first sealing portion 151.

[0077] The inner wall 141 of the second assembly hole 142 has a reserved gap 18 between itself and the sealing element 15. That is, the inner wall 141 does not contact the outer wall of the sealing element 15, which can prevent the inner wall 141 from entering the sealing interface between the cover plate body 11 and the sealing element 15 (i.e., the contact surface between the cover plate body 11 and the sealing element 15 as shown in Figure 7). This ensures that the added first high-temperature resistant component 14 does not affect the sealing interface between the cover plate body 11 and the sealing element 15, thereby improving 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, so that the first high-temperature resistant component 14 will not interfere with the sealing of the gap between the cover plate body 11 and the electrode plate 122 by the second sealing part 152. If the outer diameter of the second sealing part 152 is larger than the diameter of the second mounting hole 142, the first high-temperature resistant component 14 may be positioned between the cover plate body 11 and the electrode plate 122, thereby affecting the sealing effect of the sealing component 15 between the cover plate body 11 and the electrode 12. By ensuring that the outer diameter of the second sealing part 152 is smaller than the diameter of the second mounting hole 142, the sealing performance of the cover plate assembly 10 under high temperature and high pressure conditions is improved, thus enhancing the safety and reliability of the battery cell 1.

[0079] In some embodiments, as shown in Figures 2, 3, and 9, Figure 9 is an exploded structural diagram of another cover plate assembly provided in this disclosure. The cover plate assembly 10 further 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 away from the insulating member 13 and is arranged around the pole post body 121. The welding block 16 is connected to the pole post body 121. Specifically, both the welding block 16 and the third insulating member 17 have through holes for the pole post body 121 to pass through. The pole post body 121 can pass through the second mounting hole 142 on the first high-temperature resistant member 14, the through hole on the insulating member 13, the through hole on the third insulating member 17, and the through hole on the welding block 16. The third insulating member 17 is disposed between the welding block 16 and the cover plate body 11, providing preliminary 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 achieve effective isolation between the welding block 16 and the cover plate body 11. The thickness direction of the third insulating element 17 refers to the stacking direction of the cover plate body 11 and the insulating element 13.

[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, or on the side of the third insulating member 17 facing the cover plate body 11, or 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 first high-temperature resistant member 14, and therefore has the same characteristics as the first high-temperature resistant member 14. Since the second high-temperature resistant member 19 also has high 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, thereby maintaining the isolation effect between the welding block 16 and the cover plate body 11. The cooperation between the first high-temperature resistant member 14 and the second high-temperature resistant member 19 not only improves the thermal stability and safety of the cover plate assembly 10, but also enhances the reliability of the cover plate assembly 10 under extreme conditions. The position of the second high-temperature resistant component 19 can be adjusted according to different needs, providing flexible insulation protection. The second high-temperature resistant component 19 prevents short circuits under high-temperature conditions, thereby enhancing the overall insulation effect.

[0081] Specifically, a second high-temperature resistant member 19 is provided on the side of the third insulating member 17 facing the cover body 11. In this case, the second high-temperature resistant member 19 is located between the third insulating member 17 and the cover body 11. The second high-temperature resistant member 19 can provide additional insulation protection, preventing direct contact between the welded block 16 and the cover body 11 in the event that the third insulating member 17 softens. Since the second high-temperature resistant member 19 will not melt or carbonize at any temperature less than or equal to 550°C, even if the third insulating member 17 loses some of its insulation properties at high temperatures, the second high-temperature resistant member 19 can still maintain its structural integrity and insulation effect. This arrangement is suitable for solutions that require additional protection on one side of the cover body 11.

[0082] Specifically, a second high-temperature resistant member 19 is provided on the side of the third insulating member 17 facing the welding block 16. In this case, the second high-temperature resistant member 19 is located between the third insulating member 17 and the welding block 16. In the event of softening of the third insulating member 17, direct contact between the welding block 16 and the third insulating member 17 is prevented, thereby protecting the cover plate body 11 from heat conduction. Since the second high-temperature resistant member 19 will not melt or carbonize at any temperature less than or equal to 550°C, even if the third insulating member 17 softens at high temperatures, the second high-temperature resistant member 19 can still effectively isolate the welding block 16 from the cover plate body 11. This arrangement is suitable for solutions requiring additional protection on one side of the welding block 16.

[0083] Specifically, second high-temperature resistant elements 19 are provided on both sides of the third insulating element 17 in the thickness direction. In this case, second high-temperature resistant elements 19 are provided between the third insulating element 17 and the cover plate body 11, and between the third insulating element 17 and the welding block 16. The second high-temperature resistant element 19 between the third insulating element 17 and the cover plate body 11 prevents direct contact between the welding block 16 and the cover plate body 11 when the third insulating element 17 softens. The second high-temperature resistant element 19 between the third insulating element 17 and the welding block 16 prevents direct contact between the welding block 16 and the third insulating element 17 when the third insulating element 17 softens. This arrangement is suitable for solutions that require additional protection on one side of the cover plate body 11 and one side of the welding block 16.

[0084] Through these three configuration methods, the second high-temperature resistant component 19 can provide flexible and effective insulation protection according to specific application requirements, maintaining the safety and reliability of the cover assembly 10 in high-temperature environments.

[0085] Accordingly, please refer to Figure 8, which is an exploded structural diagram of the battery cell provided in an embodiment of this disclosure. The battery cell 1 provided in this embodiment 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 1 can possess all the technical features and beneficial effects of the cover plate assembly 10 described above, which will not be repeated here.

[0086] Accordingly, embodiments of this disclosure also provide a new energy vehicle, which includes a vehicle body and the aforementioned battery cell 1, with the battery cell 1 mounted on the vehicle body. This new energy vehicle can possess all the technical features and beneficial effects of the aforementioned battery cell 1, which will not be elaborated further here.

[0087] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be found in the relevant descriptions of other embodiments. The embodiments can be combined with each other, but will not be described in detail here.

[0088] The foregoing has provided a detailed description of the cover plate assembly, battery cell, and new energy vehicle provided in the embodiments of this disclosure, and specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this disclosure. 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; and 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 disclosure.

Claims

1. A cover plate assembly, comprising: Cover plate body (11); The pole (12) includes a pole body (121) and a pole plate (122), wherein the pole body (121) is disposed on the pole plate (122); An insulating element (13) is disposed between the cover plate body (11) and the pole plate body (122); The first high-temperature resistant component (14) is disposed between the cover plate body (11) and the pole plate body (122); The first high-temperature resistant component (14) will not melt or carbonize at any temperature less than or equal to 550°C.

2. The cover plate assembly according to claim 1, wherein, The first high-temperature resistant component (14) is made of polyimide.

3. The cover plate assembly according to claim 1, wherein, The thickness of the first high-temperature resistant component (14) is less than or equal to 0.3 mm.

4. The cover plate assembly according to claim 1 or 3, wherein, The thickness of the first high-temperature resistant component (14) is greater than or equal to 0.02 mm.

5. The cover plate assembly according to claim 1, wherein, The first high-temperature resistant component (14) has an insulation resistance greater than or equal to 200mΩ under a high voltage of 500V.

6. The cover plate assembly according to claim 1, wherein, The projection of the first high-temperature resistant component (14) in the thickness direction of the cover plate body (11) covers the edge of the pole plate body (122).

7. The cover plate assembly according to claim 1, wherein, The first high-temperature resistant component (14) is located between the cover plate body (11) and the insulating component (13).

8. The cover plate assembly according to claim 1, wherein, The first high-temperature resistant component (14) is located between the insulating component (13) and the pole plate (122).

9. The cover plate assembly according to claim 7 or 8, wherein, The cover plate body (11) has at least one first mounting hole (111) through which the pole body (121) passes, and the first high temperature resistant component (14) has at least one second mounting hole (142) through which the pole body (121) passes.

10. The cover plate assembly according to claim 9, wherein, The cover plate assembly (10) further includes a sealing element (15), which includes a first sealing part (151) and a second sealing part (152) connected together. The first sealing part (151) passes through the first assembly hole (111) and the second assembly hole (142) and is disposed between the cover plate body (11) and the pole body (121). The second sealing part (152) is disposed between the cover plate body (11) and the pole plate body (122).

11. The cover plate assembly according to claim 10, wherein, There is a gap (18) between the inner wall (141) of the second assembly hole (142) and the seal (15).

12. A battery cell (1), comprising: Casing (30); An electrode assembly (20) is disposed within the housing (30); The cover assembly (10) as described in any one of claims 1 to 11 is disposed at the opening of the housing (30); The housing (30) and the cover body (11) of the cover assembly (10) form an accommodating space (31), and the pole plate (122), the insulating component (13) and the first high-temperature resistant component (14) of the cover assembly (10) are located in the accommodating space (31).

13. A new energy vehicle, comprising: Vehicle body; The battery cell (1) as claimed in claim 12 is disposed on the vehicle body.

Images