Cover plate assembly and energy storage battery

Abstract

This application provides a cover assembly and an energy storage battery, including a cover, a terminal structure, a seal, an upper insulating member, and a support member. The cover includes a top surface and a bottom surface distributed along its thickness direction, and the cover has a mounting hole that penetrates the top and bottom surfaces along the thickness direction. The terminal structure is mounted in the mounting hole and includes a pressure ring disposed opposite to the top surface and an abutment portion disposed opposite to the bottom surface. The seal is disposed around the terminal structure and is clamped between the bottom surface and the abutment portion. The upper insulating member is disposed on the top surface of the cover and includes an insulating portion disposed between the pressure ring and the top surface. The support member is disposed between the top surface and the pressure ring. When at least a portion of the insulating portion melts, one end of the support member abuts against the top surface, and the other end of the support member abuts against the pressure ring to restrict the movement of the abutment portion away from the bottom surface, so that the abutment portion and the bottom surface compress the seal, thereby maintaining the sealing performance of the seal.

Description

Technical Field

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

[0002] In related technologies, the top surface of the cover of the energy storage battery is insulated from the terminal structure by an upper insulating component. When the heat generated during the operation of the core pack is large, the upper insulating component of the cover assembly may melt, soften and deform to a certain extent, which may cause the terminal structure to shift relative to the cover. This may affect the compression state of the seal between the terminal structure and the cover, leading to seal failure and the risk of electrolyte and high-temperature gas in the energy storage battery leaking out from between the terminal structure and the cover. Utility Model Content

[0003] The embodiments of this application provide a cover plate assembly and an energy storage battery, which can improve the technical problem that the high temperature generated by the core pack of the energy storage battery causes the upper insulating component of the cover plate assembly to melt, soften and deform to a certain extent, resulting in displacement of the electrode structure relative to the cover and causing the seal to fail.

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

[0005] A cap includes a top surface and a bottom surface distributed along its thickness direction, and the cap has a mounting hole that penetrates the top surface and the bottom surface of the cap along the thickness direction;

[0006] An electrode post structure is installed in the mounting hole. The electrode post structure includes a pressure ring disposed opposite to the top surface and an abutment portion disposed opposite to the bottom surface.

[0007] A sealing element is disposed around the pole post structure, and the sealing element is clamped between the bottom surface and the abutment portion;

[0008] An upper insulating member is disposed on the top surface of the cover, the upper insulating member including an insulating portion disposed between the pressure ring and the top surface;

[0009] A support member is disposed between the top surface and the pressure ring. When at least a portion of the insulating part is melted, one end of the support member is used to abut against the top surface, and the other end of the support member is used to abut against the pressure ring to restrict the abutting portion from moving away from the bottom surface, so that the abutting portion and the bottom surface compress the seal.

[0010] In some embodiments, the pressure ring includes an abutting surface for abutting against the support member, the distance between the abutting surface and the top surface being greater than or equal to the height of the support member in the thickness direction.

[0011] In some embodiments, the difference between the distance between the abutting surface and the top surface and the height of the support member in the thickness direction is less than or equal to 0.3 mm.

[0012] In some embodiments, when one end of the support abuts against the top surface and the other end of the support abuts against the pressure ring, the compression of the seal is greater than or equal to 25%.

[0013] In some embodiments, the insulating portion is disposed around the side of the support member.

[0014] In some embodiments, the insulating portion has a receiving hole extending through the thickness direction, and at least a portion of the support member is located within the receiving hole.

[0015] In some embodiments, in the thickness direction, the height of the support is less than or equal to the depth of the receiving hole.

[0016] In some embodiments, the pressure ring has a positioning groove on the side facing the cover, and at least a portion of the support structure is located within the positioning groove.

[0017] In some embodiments, the support member is a long strip structure, wherein the angle formed by the length direction and the thickness direction of the long strip structure is greater than or equal to 85° and less than or equal to 95°; or,

[0018] The support member is a long strip structure that extends circumferentially along the pole structure; or...

[0019] The support member is a columnar structure extending along the thickness direction.

[0020] In some embodiments, the melting point of the support member is greater than the melting point of the insulating portion; the material of the support member includes ceramic or glass.

[0021] In some embodiments, the number of the support members is multiple, and the multiple support members are arranged circumferentially along the pole structure.

[0022] Secondly, embodiments of this application provide an energy storage battery, including the cover assembly described above, the cover assembly comprising:

[0023] A cap includes a top surface and a bottom surface distributed along its thickness direction, and the cap has a mounting hole that penetrates the top surface and the bottom surface of the cap along the thickness direction;

[0024] An electrode post structure is installed in the mounting hole. The electrode post structure includes a pressure ring disposed opposite to the top surface and an abutment portion disposed opposite to the bottom surface.

[0025] A sealing element is disposed around the pole post structure, and the sealing element is clamped between the bottom surface and the abutment portion;

[0026] An upper insulating member is disposed on the top surface of the cover, the upper insulating member including an insulating portion disposed between the pressure ring and the top surface;

[0027] A support member is disposed between the top surface and the pressure ring. When at least a portion of the insulating part is melted, one end of the support member is used to abut against the top surface, and the other end of the support member is used to abut against the pressure ring to restrict the abutting portion from moving away from the bottom surface, so that the abutting portion and the bottom surface compress the seal.

[0028] The beneficial effects of the embodiments of this application are as follows:

[0029] In the embodiments of this application, a support member is provided between the pressure ring of the terminal structure of the cover plate assembly and the top surface of the cover, and a sealing member surrounding the terminal structure is provided between the abutment portion of the terminal structure and the bottom surface of the cover. When the insulation portion of the upper insulating member located between the pressure ring and the top surface of the cover undergoes a certain degree of melting, softening and deformation under the influence of the high temperature of the battery pack, one end of the support member can abut against the top surface, and the other end of the support member can abut against the pressure ring, thereby restricting the abutment portion from moving away from the bottom surface, so that the abutment portion and the bottom surface compress the sealing member, thereby maintaining the sealing performance of the sealing member and avoiding the problem of leakage of electrolyte and high-temperature gas in the battery from between the terminal structure and the cover due to the failure of the sealing member. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is an exploded structural diagram of one embodiment of the cover plate assembly provided in this application;

[0032] Figure 2 This is a cross-sectional view of one embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover;

[0033] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4This is a partial view of a cross-sectional view of another embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover;

[0035] Figure 5 This is a cross-sectional view of the first embodiment of the upper insulating member and pole post structure provided in this application, wherein the cutting plane is perpendicular to the thickness direction of the cap;

[0036] Figure 6 This is a cross-sectional view of a second embodiment of the upper insulating member and pole post structure provided in this application, wherein the cutting plane is perpendicular to the thickness direction of the cap;

[0037] Figure 7 This is a cross-sectional view of a third embodiment of the upper insulating member and pole structure provided in this application, wherein the cutting plane is perpendicular to the thickness direction of the cap.

[0038] Cover assembly 100; Cover 110; Exhaust structure 1101; Mounting hole 1102; Bottom surface 1103; Top surface 1104; Positioning groove 1105; Lower insulating component 120; Explosion-proof valve 140; Upper insulating component 160; Insulating part 161; Receiving hole 1611; Support component 170; Pole post structure 180; Pressure ring 181; Abutting surface 1811; Pole post 182; Abutting part 183; Sealing component 190; Thickness direction Z. Detailed Implementation

[0039] 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 the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0040] In related technologies, the top surface of the cover assembly of an energy storage battery is insulated from the terminal structure by an upper insulating component. When the heat generated during the operation of the battery pack is large, the upper insulating component of the cover assembly may melt, soften, and deform to a certain extent. This may cause changes in the compression of the seal between the terminal structure and the cover, weakening the sealing effect. When the pressure inside the energy storage battery is too high, there is a risk that the electrolyte inside the energy storage battery may leak out from the gap between the terminal structure and the cover. Simultaneously, the melting and softening deformation of the upper insulating component may cause the terminal structure to come into contact with the cover, creating a short circuit risk.

[0041] This application provides a cover plate assembly and an energy storage battery.

[0042] Figure 1 This is an exploded structural diagram of one embodiment of the cover plate assembly provided in this application. Figure 2 This is a cross-sectional view of one embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover. Figure 3 yes Figure 2 A magnified view of point A in the middle. (See image below.) Figures 1 to 3 As shown, the cover assembly 100 includes a cover 110, which includes a top surface 1104 and a bottom surface 1103 distributed along its thickness direction. A mounting hole 1102 is provided in the cover 110, which penetrates the top surface 1104 and the bottom surface 1103 of the cover 110 along its thickness direction.

[0043] The cover assembly 100 further includes a pole post structure 180 and an upper insulating member 160. The pole post structure 180 is installed in the mounting hole 1102 of the cover 110, and includes a pressure ring 181 disposed opposite to the top surface 1104. The upper insulating member 160 is disposed on the top surface 1104 of the cover 110, and includes an insulating portion 161 located between the pressure ring 181 of the pole post structure 180 and the top surface 1104 of the cover 110. The insulating portion 161 can support the pressure ring 181 of the pole post structure 180, preventing the pressure ring 181 of the pole post structure 180 from contacting the top surface 1104 of the cover 110. At the same time, the insulating portion 161 can also provide a certain degree of sealing between the pole post structure 180 and the cover 110.

[0044] Continue to refer to Figure 3The pole post structure 180 includes an abutment portion 183 disposed opposite to the bottom surface 1103. The abutment portion 183 may extend circumferentially along the mounting hole 1102 in an annular structure. The cover plate assembly 100 also includes a seal 190 disposed around the pole post structure 180 and sandwiched between the bottom surface 1103 and the abutment portion 183, thereby compressing the seal 190 under the pressure of the bottom surface 1103 and the abutment portion 183 to seal the gap between the abutment portion 183 and the bottom surface 1103.

[0045] In some embodiments, the cover assembly 100 may further include a support member 170 disposed between the top surface 1104 of the cover 110 and the pressure ring 181 of the pole structure 180. When at least a portion of the insulating portion 161 is molten, one end of the support member 170 is used to abut against the top surface 1104 of the cover 110, and the other end of the support member 170 is used to abut against the pressure ring 181, so that the support member 170 is supported between the pressure ring 181 and the top surface 1104, thereby restricting the movement of the abutting portion 183 away from the bottom surface 1103, and causing the abutting portion 183 and the bottom surface 1103 to compress the sealing member 190, thereby maintaining the sealing effect of the sealing member 190.

[0046] In this embodiment, a support member 170 is provided between the pressure ring 181 of the terminal structure 180 of the cover plate assembly 100 and the top surface 1104 of the cover 110, and a sealing member 190 surrounding the terminal structure 180 is provided between the abutment portion 183 of the terminal structure 180 and the bottom surface 1103 of the cover 110. When the upper insulating member 160 is located between the pressure ring 181 and the top surface 1104 of the cover 110, the insulating portion 161 between the pressure ring 181 and the top surface 1104 of the cover 110 undergoes a certain degree of melting under the high temperature of the battery pack. After melting and softening deformation, one end of the support member 170 can abut against the top surface 1104, and the other end of the support member 170 can abut against the pressure ring 181, so as to restrict the abutment part 183 from moving away from the bottom surface 1103, so that the abutment part 183 and the bottom surface 1103 compress the seal member 190, thereby maintaining the sealing performance of the seal member 190 and avoiding the problem of electrolyte and high temperature gas in the energy storage battery leaking out from between the terminal structure 180 and the cover 110 due to the failure of the seal member 190.

[0047] In some embodiments, when one end of the support member 170 abuts against the top surface 1104 and the other end of the support member 170 abuts against the pressure ring 181, the compression amount of the seal 190 is greater than or equal to 25%, thereby giving the seal 190 a better sealing effect. When one end of the support member 170 abuts against the top surface 1104 and the other end of the support member 170 abuts against the pressure ring 181, the compression amount of the seal 190 can be 26%, 28%, 29%, 32%, etc., specifically determined according to the material of the seal 190 and the sealing requirements of the pole structure 180 and the cap 110.

[0048] In some embodiments, the support member 170 can be an insulating member. When the insulating part 161 of the upper insulating member 160 located between the crush 181 and the top surface 1104 of the cover 110 undergoes a certain degree of melting and softening deformation under the influence of the high temperature of the battery pack, one end of the support member 170 can abut against the top surface 1104, and the other end of the support member 170 can abut against the pressure ring 181. This ensures that the pressure ring 181 of the pole post structure 180 and the top surface 1104 of the cover 110 are always kept at a certain distance, thus preventing the pole post structure 180 and the cover 110 with opposite polarities from being short-circuited through the support member 170.

[0049] In some embodiments, the electrode post structure 180 includes an electrode post 182 and a pressure ring 181. The electrode post 182 passes through the mounting hole 1102, and the pressure ring 181 protrudes from the outer periphery of the electrode post 182. The pressure ring 181 extends circumferentially along the electrode post 182 in an annular structure. One end of the electrode post 182 protrudes from the pressure ring 181 for connection to a busbar. One end of the electrode post 182 is connected to the pressure ring 181 by means of snap-fit, riveting, welding, etc. Of course, the electrode post 182 can also be an integral structure with the pressure ring 181.

[0050] The end of the pole post 182 away from the pressure ring 181 passes through the mounting hole 1102 of the cover 110, and the outer periphery of the end of the pole post 182 away from the pressure ring 181 is provided with a flange to form an abutment portion 183. The seal 190 is a sealing ring disposed around the pole post 182. One side of the seal 190 abuts against the abutment portion 183 facing the bottom surface 1103 of the cover 110, and the other side of the seal 190 abuts against the bottom surface 1103 of the cover 110, thereby sealing the gap between the abutment portion 183 of the pole post 182 and the bottom surface 1103 of the cover 110.

[0051] By supporting the pressure ring 181 of the pole post structure 180 with the support member 170, the distance between the abutting part 183 of the pole post 182 and the bottom surface 1103 of the cover 110 will not continue to increase. This results in a larger compressive force on the sealing member 190 from the abutting part 183 of the pole post 182 and the bottom surface 1103 of the cover 110, so as to maintain the compression of the sealing member 190 and give the sealing member 190 a better sealing effect.

[0052] In some embodiments, the melting point of the support member 170 may be greater than the melting point of the insulating portion 161 of the insulating member 160, so that the melting point of the support member 170 is higher, thereby reducing the problem that the support member 170 melts in a high-temperature environment, which would weaken the support effect on the pressure ring 181 of the pole post structure 180.

[0053] In this embodiment, the melting point of the support member 170 can be greater than the thermal runaway temperature of the battery cell, so that the support member 170 will not undergo large deformation when the battery cell undergoes thermal runaway, and will still have a good supporting effect on the upper insulating member 160 or the pressure ring 181 of the pole structure 180.

[0054] Specifically, the support member 170 can be made of a material with a high melting point and good insulation properties. As a result, the upper insulating member 160 undergoes a certain degree of melting, softening, and deformation, causing the support member 170 to pass through the contact portion between the upper insulating member 160 and the pressure ring 181 of the pole post structure 180, thus preventing the pressure ring 181 of the pole post structure 180 from conducting through the support member 170 to the cover 110. The material of the support member 170 can include ceramics, glass, or other high-temperature resistant insulating materials; there are no limitations on this.

[0055] like Figure 3 As shown, the pressure ring 181 of the pole structure 180 includes an abutment surface 1811 for abutting against the support member 170. In some embodiments, the distance H1 between the abutment surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 can be greater than or equal to the height H2 of the support member 170 in the thickness direction Z.

[0056] Therefore, it is possible to avoid the support member 170 lifting the pressure ring 181 and affecting the installation of the pole post structure 180. In particular, when the distance H1 between the abutment surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 is greater than the height H2 of the support member 170 in the thickness direction Z, it is possible to have a gap between one end of the support member 170 and the top surface 1104 of the cover 110, or to have a gap between the other end of the support member 170 and the abutment surface 1811 of the pressure ring 181 of the pole post structure 180, thereby further reducing the risk of the support member 170 lifting the pressure ring 181.

[0057] In addition, the difference between the distance H1 between the contact surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 and the height H2 of the support member 170 in the thickness direction Z can be less than or equal to 0.3 mm, so that the support member 170 has a better limiting effect on the pressure ring 181 of the pole post structure 180, and avoids that the difference between the distance H1 between the contact surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 and the height H2 of the support member 170 in the thickness direction Z is too large, which would cause the pole post structure 180 to have a large displacement relative to the cover 110.

[0058] The difference between the distance H1 between the contact surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 and the height H2 of the support member 170 in the thickness direction Z can be 0.05mm, 0.1mm, 0.2mm, etc., and is not limited here.

[0059] In some embodiments, the insulating portion 161 may be disposed around the side of the support member 170, thereby enabling the insulating portion 161 to play a certain positioning role for the support member 170, so that the support member 170 is more stably held between the pressure ring 181 and the top surface 1104.

[0060] Specifically, an accommodating hole 1611 extending Z-direction along the thickness direction can be formed in the insulating portion 161 of the upper insulating member 160. At least a portion of the support member 170 is located within the accommodating hole 1611, thereby allowing the insulating portion 161 of the upper insulating member 160 to avoid interference between the support member 170 and the insulating portion 161 of the upper insulating member 160. Furthermore, by accommodating at least a portion of the support member 170 within the accommodating hole 1611 of the upper insulating member 160, the position of the support member 170 relative to the pole post structure 180 becomes more stable, which facilitates more stable support of the pressure ring 181 of the pole post structure 180 by the support member 170.

[0061] In the thickness direction Z, the height H2 of the support member 170 can be less than or equal to the depth H3 of the receiving hole 1611. This allows the support member 170 to be fully contained within the receiving hole 1611, ensuring that the distance H1 between the abutment surface 1811 of the pressure ring 181 and the top surface 1104 of the cover 110 is greater than or equal to the height H2 of the support member 170 in the thickness direction Z, thus reducing the risk of the support member 170 lifting the pressure ring 181.

[0062] In some embodiments, the support member 170 may be interference-fitted with the receiving hole 1611 of the insulating part 161 to improve the connection stability between the support member 170 and the insulating part 161.

[0063] Figure 4 This is a partial cross-sectional view of another embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover. In other embodiments, such as Figure 4 As shown, a positioning groove 1105 can be provided on the side of the pressure ring 181 facing the cover 110, and at least a portion of the support member 170 is located within the positioning groove 1105. Therefore, the positioning groove 1105 can be used to position the support member 170 relative to the pole post structure 180, allowing the support member 170 to provide more stable direct or indirect support to the pressure ring 181 of the pole post structure 180.

[0064] The abutment surface 1811 is located on the bottom surface of the positioning groove 1105, which allows the end of the support member 170 away from the top surface 1104 of the cover 110 to abut against the abutment surface 1811 located at the bottom of the positioning groove 1105, thereby enabling the support member 170 to support the pressure ring 181 of the pole post structure 180.

[0065] In some embodiments, such as Figure 1 As shown, the number of support members 170 can be multiple, and the multiple support members 170 are arranged circumferentially along the pole post structure 180. Multiple support members 170 can more stably support the pressure ring 181 of the pole post structure 180, thereby further reducing the risk of failure of the seal 190 due to displacement of the pole post structure 180 relative to the cover 110. Simultaneously, it further reduces the risk of contact between the pressure ring 181 of the pole post structure 180 and the top surface 1104 of the cover 110. The number of support members 170 can be two, three, four, or more, depending on the shape, material, etc., of the support members 170.

[0066] Specifically, the lower insulating member 160 has a plurality of receiving holes 1611. The number of the plurality of receiving holes 1611 is equal to the number of the plurality of supporting members 170, and at least a portion of the plurality of supporting members 170 is received one-to-one in the plurality of receiving holes 1611.

[0067] In some embodiments, such as Figure 5 As shown, the support member 170 can be a long strip structure, and the long strip structure of the support member 170 extends along the circumference of the pole post structure 180, thereby increasing the contact area between the support member 170 and the pressure ring 181 of the pole post structure 180, so as to provide more stable support for the pressure ring 181 of the pole post structure 180.

[0068] It is understandable that, since the support member 170 passes through the insulation part 161, if the width of the support member 170 in the radial direction along the pole structure 180 is too large, it will result in the insulation part 161 having too small a width at the support member 170, affecting the structural strength of the insulation part 161 at the support member 170.

[0069] In this embodiment, the elongated support member 170 extends circumferentially along the pole post structure 180. While keeping the radial width of the support member 170 unchanged, the length of the support member 170 in the circumferential direction of the pole post structure 180 is increased as much as possible. This increases the contact area between the support member 170 and the pressure ring 181 of the pole post structure 180 as much as possible without affecting the structural strength of the insulation part 161, thereby providing more stable support for the pressure ring 181 of the pole post structure 180.

[0070] Among them, such as Figure 5 As shown, the support member 170 can be an arc-shaped structure extending circumferentially along the pole structure 180. The end faces of the support member 170 at both ends along its own extension direction can be curved surfaces or flat surfaces.

[0071] In other embodiments, such as Figure 6As shown, the support member 170 can also be a long strip structure, and the angle formed between the length direction and the thickness direction Z of the long strip structure support member 170 can be greater than or equal to 85° and less than or equal to 95°, so that the length direction of the support member 170 is basically perpendicular to the thickness direction Z. This also increases the contact area between the support member 170 and the pressure ring 181 of the pole post structure 180 to a certain extent without affecting the structural strength of the insulation part 161, thus providing more stable support for the pressure ring 181 of the pole post structure 180. The support member 170 can also be a cuboid structure.

[0072] In addition, such as Figure 7 As shown, the support member 170 can also be a columnar structure extending along the thickness direction Z. Specifically, the support member 170 can be a cylindrical structure, a quadrangular prism structure, etc.

[0073] In some embodiments, the cover assembly 100 further includes a lower insulator 120 disposed opposite to the bottom surface 1103 of the cover 110. When the cover assembly 100 is used for an energy storage battery, the lower insulator 120 of the cover assembly 100 is located on the side of the cover 110 facing the battery pack, thereby insulating and isolating the cover 110 and the battery pack through the lower insulator 120.

[0074] like Figure 1 As shown, the cover 110 is provided with a venting structure 1101, which allows excessive pressure inside the energy storage battery to be released through the venting structure 1101. The venting structure 1101 can be formed by creating a venting hole in the cover 110. The cover assembly 100 may also include an explosion-proof valve 140 located at the venting hole. When the pressure inside the energy storage battery increases to a certain value, the explosion-proof valve 140 opens, allowing the high-pressure gas inside the energy storage battery to be quickly released through the venting hole.

[0075] Alternatively, an integrated explosion-proof valve 140 can be directly installed on the cover 110 to form an exhaust structure 1101. Specifically, grooves can be provided on the cover 110 to form the explosion-proof valve 140. When the pressure inside the energy storage battery is too high, the grooves will break under the action of air pressure to form an exhaust port of the exhaust structure 1101.

[0076] In this embodiment, the upper insulating member 160 and the lower insulating member 120 can be made of plastic or other insulating materials, and there are no restrictions here.

[0077] This application also provides an energy storage battery, which includes a cover plate assembly. The specific structure of the cover plate assembly is as described in the above embodiments. Since this energy storage battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0078] The energy storage battery provided in this application embodiment has a support member 170 provided between the pressure ring 181 of the terminal structure 180 of the cover plate assembly 100 and the top surface 1104 of the cover 110, and a sealing member 190 surrounding the terminal structure 180 provided between the abutment portion 183 of the terminal structure 180 and the bottom surface 1103 of the cover 110. When the upper insulating member 160 is located between the pressure ring 181 and the top surface 1104 of the cover 110, the insulating portion 161 of the battery pack undergoes a certain degree of melting and softening under the high temperature of the battery pack. After forming, one end of the support member 170 can abut against the top surface 1104, and the other end of the support member 170 can abut against the pressure ring 181 to restrict the movement of the abutment part 183 away from the bottom surface 1103, so that the abutment part 183 and the bottom surface 1103 compress the seal member 190, thereby maintaining the sealing performance of the seal member 190 and avoiding the problem of electrolyte and high-temperature gas in the energy storage battery leaking out from between the terminal structure 180 and the cover 110 due to the failure of the seal member 190, which is beneficial to improving the safety of the energy storage battery.

[0079] The energy storage battery may include a casing and a core pack (not shown in the figure), with the core pack disposed inside the casing. The casing includes a cover assembly 100, with the bottom surface 1103 of the cover assembly 100 facing the core pack.

[0080] 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 description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A cover assembly, characterized by include: A cap includes a top surface and a bottom surface distributed along its thickness direction, and the cap has a mounting hole that penetrates the top surface and the bottom surface of the cap along the thickness direction; An electrode post structure is installed in the mounting hole. The electrode post structure includes a pressure ring disposed opposite to the top surface and an abutment portion disposed opposite to the bottom surface. A sealing element is disposed around the pole post structure, and the sealing element is clamped between the bottom surface and the abutment portion; An upper insulating member is disposed on the top surface of the cover, the upper insulating member including an insulating portion disposed between the pressure ring and the top surface; A support member is disposed between the top surface and the pressure ring. When at least a portion of the insulating part is melted, one end of the support member is used to abut against the top surface, and the other end of the support member is used to abut against the pressure ring to restrict the abutting portion from moving away from the bottom surface, so that the abutting portion and the bottom surface compress the seal.

2. The cover plate assembly as claimed in claim 1, characterized in that, The pressure ring includes an abutting surface for abutting against the support member, and the distance between the abutting surface and the top surface is greater than or equal to the height of the support member in the thickness direction.

3. The cover plate assembly as claimed in claim 2, characterized in that, The difference between the distance between the contact surface and the top surface and the height of the support member in the thickness direction is less than or equal to 0.3 mm.

4. The cover plate assembly as claimed in claim 1, characterized in that, When one end of the support member abuts against the top surface and the other end of the support member abuts against the pressure ring, the compression of the seal is greater than or equal to 25%.

5. The cover plate assembly as claimed in claim 1, characterized in that, The insulating portion is disposed around the side of the support member.

6. The cover plate assembly as claimed in claim 5, characterized in that, The insulating part has a receiving hole that extends through the thickness direction, and at least a portion of the support member is located within the receiving hole.

7. The cover plate assembly as claimed in claim 6, characterized in that, In the thickness direction, the height of the support is less than or equal to the depth of the receiving hole.

8. The cover plate assembly as claimed in claim 6, characterized in that, The pressure ring has a positioning groove on the side facing the cover, and at least a portion of the support structure is located within the positioning groove.

9. The cover plate assembly as claimed in any one of claims 1 to 8, characterized in that, The support member is a long strip structure, and the angle formed between the length direction and the thickness direction of the long strip structure is greater than or equal to 85° and less than or equal to 95°; or, The support member is a long strip structure that extends circumferentially along the pole structure; or, The support member is a columnar structure extending along the thickness direction.

10. The cover plate assembly as claimed in claim 9, characterized in that, The melting point of the support member is greater than that of the insulation part; the material of the support member includes ceramic or glass.

11. The cover plate assembly as claimed in any one of claims 1 to 8, characterized in that, The number of the support members is multiple, and the multiple support members are arranged circumferentially along the pole structure.

12. An energy storage battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 11.

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