Cover plate assembly and energy storage battery

Abstract

The present application provides a cover plate assembly and an energy storage battery. The cover plate assembly comprises a sealing cover, a lower insulating member, and a first temperature-resistant member or a third temperature-resistant member. The first temperature-resistant member is mounted between the sealing cover and the lower insulating member, such that there is a gap between the sealing cover and the lower insulating member at an exhaust structure, and the first temperature-resistant member is fixedly connected to the sealing cover or the lower insulating member. Alternatively, the third temperature-resistant member is configured to pass through a through-hole and abut against a cell assembly located on a side of the lower insulating member facing away from the sealing cover, such that there is a gap between the sealing cover and the cell assembly at the exhaust structure. The first temperature-resistant member or the third temperature-resistant member is capable of supporting the lower insulating member or the cell assembly, so that the cell assembly does not move towards the sealing cover and blocks the exhaust structure of the sealing cover, thereby enabling high-pressure gas inside the energy storage battery to continue to be discharged through the exhaust structure.

Description

Cover plate assembly and energy storage battery

[0001] This application claims priority to Chinese patent applications filed on December 24, 2024, with application numbers 202423209872.7, 202411923783.0, 202423209879.9 and 202423209889.2, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a cover plate assembly and an energy storage battery. Background Technology

[0003] In related technologies, the cover assembly of an energy storage battery is insulated from the core pack by a lower insulating component. Invention Overview

[0004] When the heat generated during the operation of the core pack is large, the lower insulation component of the cover plate assembly may melt, soften and deform to a certain extent. This may cause the core pack to move toward the cover and block the venting structure of the cover, preventing the explosion-proof valve installed in the venting structure from releasing pressure in time, which may lead to the explosion of the energy storage battery.

[0005] This application provides a cover plate assembly. The cover plate assembly includes:

[0006] The cap is equipped with a venting structure.

[0007] The lower insulating element is disposed opposite to the cover;

[0008] The cover assembly further includes a first heat-resistant element, which is installed between the cover and the lower insulating element to create a gap between the cover and the lower insulating element at the exhaust structure. The first heat-resistant element is fixedly connected to either the cover or the lower insulating element; or...

[0009] The lower insulating member has a through hole, and the cover plate assembly also includes a third heat-resistant member. The third heat-resistant member is located on the side of the cover facing the lower insulating member. The third heat-resistant member is configured to pass through the through hole and abut against the core package located on the side of the lower insulating member away from the cover, so that there is a gap between the cover and the core package at the exhaust structure.

[0010] This application also provides an energy storage battery. The energy storage battery includes a cover assembly as described above, the cover assembly comprising:

[0011] The cap is equipped with a venting structure.

[0012] The lower insulating element is disposed opposite to the cover;

[0013] The cover assembly further includes a first heat-resistant element, which is installed between the cover and the lower insulating element to create a gap between the cover and the lower insulating element at the exhaust structure. The first heat-resistant element is fixedly connected to either the cover or the lower insulating element; or...

[0014] The lower insulating member has a through hole, and the cover plate assembly also includes a third heat-resistant member. The third heat-resistant member is located on the side of the cover facing the lower insulating member. The third heat-resistant member is configured to pass through the through hole and abut against the core package located on the side of the lower insulating member away from the cover, so that there is a gap between the cover and the core package at the exhaust structure. Beneficial effects

[0015] The cover plate assembly and energy storage battery provided in this application provide a first heat-resistant element between the lower insulator and the cover, and fix the first heat-resistant element to the cover or the lower insulator so that there is a gap between the cover and the lower insulator at the venting structure of the cover, which can keep the position of the first heat-resistant element stable. Alternatively, a third heat-resistant element is provided on the side of the cover facing the lower insulator, and the third heat-resistant element passes through the through hole of the lower insulator and abuts against the core package located on the side of the lower insulator opposite to the cover, so that there is a gap between the core package and the cover at the venting structure of the cover. Due to the high-temperature resistance of the first or third heat-resistant component, when the lower insulation component of the cover assembly undergoes a certain degree of melting, softening, and deformation under the high temperature influence of the battery pack, the first or third heat-resistant component will not undergo significant deformation due to the high temperature. This allows the first or third heat-resistant component to support the lower insulation component or the battery pack, ensuring that the battery pack and the venting structure of the cover maintain a certain distance. The battery pack will not move towards the cover and block the venting structure, keeping the venting structure of the cover connected to the interior of the battery. When the explosion-proof valve is opened, the venting structure of the cover remains connected to the interior of the battery, allowing the high-pressure gas inside the battery to continue to be discharged through the venting structure. Attached Figure Description

[0016] Figure 1 is an exploded structural diagram of an embodiment of the cover plate assembly provided in this application;

[0017] Figure 2 is a cross-sectional view of an embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover;

[0018] Figure 3 is an enlarged view of point A in Figure 2;

[0019] Figure 4 is a structural schematic diagram of an embodiment of the cap, the first heat-resistant component, and the second heat-resistant component provided in this application;

[0020] Figure 5 is a bottom view of one embodiment of the cover plate assembly provided in this application;

[0021] Figure 6 is a structural schematic diagram of an embodiment of the first heat-resistant component provided in this application;

[0022] Figure 7 is a structural schematic diagram of another embodiment of the first heat-resistant component provided in this application;

[0023] Figure 8 is 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;

[0024] Figure 9 is an enlarged view of point B in Figure 8;

[0025] Figure 10 is a schematic diagram of the structure of an embodiment of the lower insulating member, the first heat-resistant member, and the second heat-resistant member provided in this application.

[0026] Figure 11 is an exploded structural diagram of an embodiment of the cover plate assembly provided in this application;

[0027] Figure 12 is an enlarged view of point C in Figure 11;

[0028] Figure 13 is a cross-sectional view of an embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover;

[0029] Figure 14 is an enlarged view of point D in Figure 13;

[0030] Figure 15 is a structural schematic diagram of an embodiment of the third heat-resistant component provided in this application;

[0031] Figure 16 is an exploded structural diagram of an embodiment of the cover plate assembly provided in this application;

[0032] Figure 17 is a cross-sectional view of an embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover;

[0033] Figure 18 is an enlarged view of point E in Figure 17;

[0034] Figure 19 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;

[0035] Figure 20 is a top view of an embodiment of the fourth heat-resistant component provided in this application;

[0036] Figure 21 is a top view of another embodiment of the fourth heat-resistant component provided in this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] Cover assembly 100; Cover 110; Exhaust structure 1101; Lower insulating component 120; Sub-plastic 121; Through hole 1200; First protrusion 1201; Sub-protrusion 1202; First receiving cavity 1203; Sub-cavity 1204; Abutting protrusion 1205; First protrusion portion 1206; Second protrusion portion 1207; Second protrusion 1208; Second receiving cavity 1209; First through hole 1210; Second through hole 1211; First heat-resistant component 130; Sub-heat-resistant component 131; First support portion 1301; Through hole 1302; First connecting portion 1303; First connecting section 1304; Second connecting section 1305; Explosion-proof valve 140; Second heat-resistant component 150; Length direction X; Width direction Y; Thickness direction Z;

[0039] First pressure relief hole 1204a; second abutment surface 1206a; transition surface 1207a; limiting surface 1210a; countersunk groove 122; second pressure relief hole 1221; third heat-resistant component 130a; exhaust channel 1300; second support part 1301a; first channel 1302a; second connecting part 1303a; mating part 1304a; second channel 1306; first abutment surface 1307; width L;

[0040] Mounting hole 1102; bottom surface 1103; top surface 1104; positioning groove 1105; upper insulating component 160; insulating part 161; receiving hole 1611; fourth temperature resistant component 170; output pole 180; pressure ring 181; pole post 182; sealing structure 190. Embodiments of the present invention

[0041] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0044] In related technologies, the cover of the energy storage battery is insulated from the core pack by the lower insulating component. When the heat generated during the operation of the core pack is large, the lower insulating component of the cover assembly may melt, soften and deform to a certain extent, which may cause the core pack to move toward the cover and block the venting structure of the cover. This may prevent the explosion-proof valve installed in the venting structure from releasing pressure in time, thereby causing the energy storage battery to explode.

[0045] This application provides a cover plate assembly and an energy storage battery.

[0046] Figure 1 is an exploded structural diagram of an embodiment of the cover plate assembly provided in this application. As shown in Figure 1, the cover plate assembly 100 includes a cover 110 and a lower insulating member 120, which is disposed opposite to the cover 110. When the cover plate assembly 100 is used in an energy storage battery, the lower insulating member 120 of the cover plate assembly 100 is located on the side of the cover 110 facing the core pack of the energy storage battery, thereby insulating and isolating the cover 110 and the core pack through the lower insulating member 120.

[0047] As shown in Figures 1 to 3, the cover 110 is provided with a venting structure 1101. When the internal pressure of the energy storage battery is too high, it can be discharged through the venting structure 1101 of the cover 110. The venting structure 1101 can be formed by opening 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 internal pressure of 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 discharged through the venting hole.

[0048] 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.

[0049] In some embodiments, the cover assembly 100 may further include a first heat-resistant element 130, which is installed between the cover 110 and the lower insulator 120 such that there is a gap between the cover 110 and the lower insulator 120 at the venting structure 1101 of the cover 110, and the first heat-resistant element 130 is fixedly connected to the cover 110 or the lower insulator 120.

[0050] The cover assembly 100 provided in this application embodiment provides a first heat-resistant element 130 between the lower insulating member 120 and the cover 110, so that there is a gap between the cover 110 and the lower insulating member 120 at the venting structure 1101 of the cover 110, and the first heat-resistant element 130 is fixedly connected to the cover 110 or the lower insulating member 120, which can keep the position of the first heat-resistant element 130 stable. Furthermore, due to the high-temperature resistance of the first heat-resistant element 130, when the lower insulating member 120 of the cover assembly 100 is exposed to the high temperature of the battery pack, the cover assembly 100 can withstand the high temperature. After a certain degree of melting, softening, and deformation, the first heat-resistant component 130 will not undergo significant deformation under the influence of high temperature. This allows the first heat-resistant component 130 to support the lower insulating component 120 or the core package, ensuring that the core package and the cover 110 always maintain a certain distance. The core package will not move toward the cover 110 and block the venting structure 1101 of the cover 110, thus maintaining communication between the venting structure 1101 of the cover 110 and the interior of the energy storage battery. This allows the high-pressure gas inside the energy storage battery to continue to be discharged through the venting structure 1101.

[0051] In some embodiments, the first heat-resistant element 130 may be welded to the cover 110, or the first heat-resistant element 130 may be injection molded to the lower insulating element 120, thereby keeping the position of the first heat-resistant element 130 relative to the venting structure 1101 stable, which is beneficial to keeping the distance between the cover 110 and the lower insulating element 120 at the venting structure 1101 of the cover 110 stable.

[0052] As shown in Figures 2 to 5, the first heat-resistant component 130 may include a first support portion 1301 and at least one first connecting portion 1303. The first support portion 1301 is configured to abut against the lower insulating component 120, and the first connecting portion 1303 is configured to connect to the cover 110, thereby connecting the first heat-resistant component 130 to the cover 110. Alternatively, the first connecting portion 1303 may be configured to be welded to the cover 110, thereby welding the first heat-resistant component 130 to the cover 110.

[0053] In some embodiments, at least one first connecting portion 1303 may protrude from the first support portion 1301 to facilitate welding connection between at least one first connecting portion 1303 and the cover 110.

[0054] The first support portion 1301 can be provided with a first connecting portion 1303 protruding on the side facing the cover 110, so that when the first connecting portion 1303 is welded to the cover 110, the first support portion 1301 can maintain a certain distance from the cover 110, so that the exhaust structure 1101 of the cover 110 can be kept in communication with the inside of the energy storage battery.

[0055] Alternatively, the first support portion 1301 may be provided with a first connecting portion 1303 protruding from at least one side of the cover 110 along the length direction X or the width direction Y. The length direction X, the width direction Y and the thickness direction Z of the cover 110 are perpendicular to each other, so that the first connecting portion 1303 of the first heat-resistant component 130 avoids the exhaust structure 1101 of the cover 110, making the welding connection between the first heat-resistant component 130 and the cover 110 more convenient.

[0056] It should be noted that the first connecting portion 1303 can protrude simultaneously from both the side of the first support portion 1301 facing the cover 110 and the side of the first support portion 1301 along the length direction X or width direction Y of the cover 110. Alternatively, the first connecting portion 1303 can protrude only from the side of the first support portion 1301 facing the cover 110, or the first connecting portion 1303 can protrude only from the side of the first support portion 1301 along the length direction X or width direction Y of the cover 110.

[0057] In some embodiments, the number of first connecting portions 1303 of the first heat-resistant element 130 can be multiple, and each of the multiple first connecting portions 1303 is connected to the cover 110. This further improves the connection strength between the first heat-resistant element 130 and the cover 110. The multiple first connecting portions 1303 can be welded to the cover 110, or they can be connected to the cover 110 in other ways. Of course, the former provides better connection stability between the first heat-resistant element 130 and the cover 110.

[0058] In some embodiments, a plurality of first connecting portions 1303 may be distributed on both sides of the first support portion 1301 along the length direction X, and a plurality of first connecting portions 1303 located on the same side edge of the first support portion 1301 may be spaced apart along the width direction Y, thereby making the connection stability between the first heat-resistant member 130 and the cover 110 higher.

[0059] Specifically, the first support portion 1301 of the first heat-resistant component 130 is plate-shaped, and one side of the plate of the first heat-resistant component 130 is spaced apart from the cover 110. The first support portion 1301 has a through hole 1302, which penetrates the first support portion 1301 along the thickness direction Z of the cover 110. Two first connecting portions 1303 are respectively provided on both sides of the first support portion 1301 along the length direction X of the cover 110, and the two first connecting portions 1303 located on the same side edge of the first support portion 1301 are spaced apart along the width direction Y of the cover 110. Each first connecting portion 1303 includes a first connecting segment 1304 and a second connecting segment 1305 connected sequentially, with the first connecting segment 1304 and the second connecting segment 1305 arranged at an included angle. One end of the first connecting segment 1304 is connected to the first support portion 1301, and the first connecting segment 1304 extends from the first support portion 1301 toward the cover 110. One end of the second connecting segment 1305 extends from the end of the first connecting segment 1304 near the cover 110. The second connecting segment 1305 and the first support portion 1301 are distributed on both sides of the first connecting segment 1304 along the length direction X of the cover 110. The second connecting segment 1305 is welded to the side of the cover 110 facing the lower insulating member 120.

[0060] Alternatively, multiple first connecting parts 1303 can be distributed on both sides of the first support part 1301 along the width direction Y, and multiple first connecting parts 1303 located on the same side edge of the first support part 1301 can be spaced apart along the length direction X, thereby making the connection stability between the first heat-resistant component 130 and the cover 110 higher.

[0061] In some embodiments, multiple first connecting portions 1303 may be distributed on both sides of the exhaust structure 1101 along the length direction X. This reduces the obstruction of the exhaust structure 1101 by the first connecting portions 1303, allowing the gas inside the energy storage battery to be discharged more quickly through the exhaust structure 1101.

[0062] Of course, multiple first connecting parts 1303 can also be distributed on both sides of the exhaust structure 1101 along the width direction Y, thereby reducing the obstruction of the exhaust structure 1101 by the first connecting parts 1303, so that the gas inside the energy storage battery can be discharged through the exhaust structure 1101 more quickly.

[0063] In some embodiments, the lower insulating member 120 may include a first protrusion 1201 corresponding to the venting structure 1101. The first protrusion 1201 has a through hole 1200 communicating with the venting structure 1101, so that when the internal pressure of the energy storage battery is too high, it can be discharged through the through hole 1200 and the venting structure 1101. The first protrusion 1201 may be configured to abut against the core pack to restrict the movement of the core pack toward the cover 110, so that a certain distance is maintained between the core pack and the cover 110.

[0064] The first heat-resistant component 130 can be installed between the cover 110 and the first protrusion 1201 to further reduce the risk that the lower insulation component 120 or the core package will block the exhaust structure 1101 after the lower insulation component 120 melts and deforms at high temperature.

[0065] In some embodiments, a first receiving cavity 1203 may be formed between the first protrusion 1201 and the cover 110, and the through hole 1200 and the venting structure 1101 are respectively connected to the first receiving cavity 1203. At least a portion of the first heat-resistant member 130 is disposed within the first receiving cavity 1203. Thus, the through hole 1200 is connected to the venting structure 1101 of the cover 110 through the first receiving cavity 1203, and the first heat-resistant member 130 can be positioned through the first receiving cavity 1203, making the position of the first heat-resistant member 130 more stable and easier to install.

[0066] In some embodiments, as shown in FIG3, an abutting protrusion 1205 may be provided on the side of the first protrusion 1201 of the lower insulating member 120 facing the cover 110. The abutting protrusion 1205 is located in the first receiving cavity 1203 and abuts against the side of the first heat-resistant member 130 away from the cover 110, so that the first heat-resistant member 130 and the through hole 1200 are spaced apart. Thus, the abutting protrusion 1205 can maintain a certain distance between the first heat-resistant member 130 and the through hole 1200 of the first protrusion 1201, thereby reducing the obstruction of the through hole 1200 of the first protrusion 1201 by the first heat-resistant member 130, and allowing the gas inside the energy storage battery to be discharged more quickly through the through hole 1200 and the exhaust structure 1101.

[0067] Specifically, the abutment protrusion 1205 may include a first protrusion 1206 and a second protrusion 1207. The first protrusion 1206 and the second protrusion 1207 respectively abut against the side of the first heat-resistant member 130 opposite to the cover 110. The extending directions of the first protrusion 1206 and the second protrusion 1207 are set at an angle, and the extending directions of the first protrusion 1206 and the second protrusion 1207 are respectively set at an angle to the thickness direction Z of the cover 110. This increases the contact area between the abutment protrusion 1205 and the first heat-resistant member 130, making the abutment between the abutment protrusion 1205 and the first heat-resistant member 130 more stable.

[0068] Specifically, the first protrusion 1206 extends along the length direction X of the cover 110, and the second protrusion 1207 extends along the width direction Y of the cover 110. The length direction X, width direction Y, and thickness direction Z of the cover 110 are perpendicular to each other. There are multiple first protrusions 1206, spaced apart along the width direction Y of the cover 110. The first protrusions 1206 and second protrusions 1207 protrude from the bottom surface of the first receiving cavity 1203 opposite to the cover 110. One end of each of the multiple first protrusions 1206 is connected to a first protrusion 1206, and the other end of each is connected to the inner surface of the first receiving cavity 1203. A through hole 1200 is formed between two adjacent first protrusions 1206.

[0069] As shown in Figures 1 and 3, the first heat-resistant component 130 includes a first support portion 1301 and a plurality of first connecting portions 1303. The first support portion 1301 is configured to abut against the abutment protrusion 1205, so that the first heat-resistant component 130 is spaced apart from the through hole 1200. A through hole 1302 is provided in the first support portion 1301, which penetrates the first support portion 1301 along the thickness direction Z of the cover 110.

[0070] The through hole 1200 may include a first through hole 1210 formed on the bottom surface of the first receiving cavity 1203. The first through hole 1210 is disposed opposite to the through hole 1302, so that the first through hole 1210 and the through hole 1302 are connected. When the pressure inside the energy storage battery is too high, the high pressure gas can quickly pass through the first through hole 1210 and the through hole 1302 and then be discharged from the exhaust structure 1101.

[0071] Furthermore, as shown in Figures 1 and 3 to 4, the multiple first connecting portions 1303 of the first heat-resistant component 130 are spaced apart and configured to connect with the cover 110. The through hole 1200 may also include a second through hole 1211 formed on the side of the first receiving cavity 1203. This second through hole 1211 is positioned opposite to the gap between two adjacent first connecting portions 1303 of the first heat-resistant component 130, allowing the second through hole 1211 to communicate with the exhaust structure 1101 through the gap between the two adjacent first connecting portions 1303. When the pressure inside the energy storage battery is too high, the high-pressure gas can quickly pass through the second through hole 1211 and the gap between the two adjacent first connecting portions 1303, and then be discharged from the exhaust structure 1101.

[0072] By including a first through hole 1210 and a second through hole 1211 in the through hole 1200, multi-channel pressure relief of the first heat-resistant component 130 can be achieved, making the flow area of ​​the through hole 1200 larger, which is beneficial to improving pressure relief efficiency and reliability.

[0073] In some embodiments, the number of first through holes 1210 can be multiple to further improve the pressure relief efficiency and stability of the through holes 1200. Specifically, the multiple first through holes 1210 are arranged in two rows along the length direction X of the cover 110, and the arrangement direction of the multiple first through holes 1210 in each row is consistent with the width direction Y of the cover 110.

[0074] In some embodiments, the number of second through holes 1211 can be multiple to further improve the pressure relief efficiency and stability of the through hole 1200. Specifically, second through holes 1211 are respectively provided on both sides of the first receiving cavity 1203 along the length direction X of the cover 110. The number of second through holes 1211 provided on the same side is multiple. The multiple second through holes 1211 provided on the same side are arranged along the width direction Y of the cover 110.

[0075] In some embodiments, as shown in Figures 2 and 3, the lower insulating member 120 includes two sub-plastics 121 separately disposed along the length X of the cover 110. A first protrusion 1201 of the lower insulating member 120 includes sub-protrusions 1202 distributed among the two sub-plastics 121. A first receiving cavity 1203 is formed between the two sub-protrusions 1202 and the cover 110. By dividing the lower insulating member 120 into two sub-plastics 121, the processing of the lower insulating member 120 becomes more convenient.

[0076] The two sub-protrusions 1202 may each be provided with an abutment protrusion 1205, and the two sub-protrusions 1202 respectively abut against the side of the first heat-resistant component 130 away from the cover 110 through the abutment protrusion 1205.

[0077] In some embodiments, as shown in FIG6, the first heat-resistant member 130 may include at least two sub-heat-resistant members 131 spaced apart, which are respectively installed between the cover 110 and the lower insulation member 120, such that there is a gap between the cover 110 and the lower insulation member 120 at the venting structure 1201. This allows the first heat-resistant member 130 to be flexibly assembled according to the structure of the lower insulation member 120. For example, as shown in FIGS. 8 to 10, when the plastic includes two sub-plastics 121 separately arranged along the length X of the cover 110, each sub-plastic 121 may be correspondingly disposed with at least one sub-heat-resistant member 131, thereby separating the sub-plastic 121 from the cover 110.

[0078] In some embodiments, the sub-heat-resistant component 131 may include a first support portion 1301 and at least one first connecting portion 1303. The first support portion 1301 is configured to abut against the lower insulating component 120, and the first connecting portion 1303 is configured to be welded to the cover 110. At least one first connecting portion 1303 of the sub-heat-resistant component 131 protrudes from the first support portion 1301, thereby making the welding connection between the sub-heat-resistant component 131 and the cover 110 more convenient.

[0079] Referring again to Figure 6, in two adjacent sub-heat-resistant components 131, the first connecting portion 1303 of one sub-heat-resistant component 131 can be located at the end of the first support portion 1301 away from the other sub-heat-resistant component 131. Therefore, when two adjacent sub-heat-resistant components 131 are connected to the cover 110, the obstruction of the first connecting portion 1303 of the sub-heat-resistant component 131 to the venting structure 1101 of the cover 110 can be reduced.

[0080] In this embodiment of the application, as shown in FIG6, at least two sub-heat-resistant components 131 can be distributed along the length direction X of the cover 110, or, as shown in FIG7, at least two sub-heat-resistant components 131 can be distributed along the width direction Y of the cover 110, depending on the structure of the lower insulating component 120.

[0081] Specifically, the first receiving cavity 1203 includes sub-cavities 1204 located on two sub-protrusions 1202, and each sub-cavity 1204 is provided with a sub-heat-resistant element 131. The sub-heat-resistant element 131 extends along the width direction Y of the cover 110.

[0082] In this embodiment, the lower insulating component 120 and the first heat-resistant component 130 can also be injection molded together, thereby fixing the lower insulating component 120 and the first heat-resistant component 130 together. The lower insulating component 120 can be plastic or other insulating materials, and there is no limitation here. Specifically, the lower insulating component 120 can be plastic. In addition, the material of the cover 110 can be metal. Specifically, the cover 110 can be a plain aluminum sheet.

[0083] In some embodiments, as shown in Figures 8 and 10, the cover assembly 100 further includes at least one second heat-resistant member 150, which is disposed on the side of the cover 110 facing the lower insulator 120 and located at the end of the cover 110 in the length direction X.

[0084] Therefore, even if the lower insulating component 120 undergoes a certain degree of melting, softening, and deformation under the high temperature of the battery pack, the second heat-resistant component 150 will not undergo significant deformation. This allows the second heat-resistant component 150 to support the lower insulating component 120 or the battery pack, ensuring that the battery pack and the cover 110 always maintain a certain distance.

[0085] The lower insulating member 120 may include at least one second protrusion 1208, and the second protrusion 1208 has a second receiving cavity 1209 formed on the side facing the cover 110. The second heat-resistant member 150 is disposed in the second receiving cavity 1209, thereby making the position of the second heat-resistant member 150 more stable, which is beneficial to improving the support stability of the second heat-resistant member 150 for the lower insulating member 120 or the core package.

[0086] The cover assembly 100 may include two second heat-resistant members 150, located at both ends of the cover 110 along its length X. Correspondingly, the lower insulating member 120 includes two second protrusions 1208, each forming a second receiving cavity 1209 on the side of the two protrusions facing the cover 110. The two second heat-resistant members 150 are installed in the two second receiving cavities 1209 in a one-to-one correspondence. This further improves the limiting effect of the second heat-resistant members 150 on the core package.

[0087] In some embodiments, the second heat-resistant element 150 may be welded to the cover 110, or the second heat-resistant element 150 may be injection molded to the lower insulation element 120, thereby keeping the position of the second heat-resistant element 150 stable, which is beneficial to keeping the cover 110 and the core package at a certain distance at all times.

[0088] In this embodiment, the melting temperatures of the first heat-resistant component 130 and the second heat-resistant component 150 can be greater than the melting temperature of the lower insulating component 120. This ensures that when the lower insulating component 120 deforms or even melts under high temperatures, the melting or deformation of the first heat-resistant component 130 and the second heat-resistant component 150 is less, thus providing better support for the lower insulating component 120 or the core package. Furthermore, the melting temperatures of the first heat-resistant component 130 and the second heat-resistant component 150 can be greater than the thermal runaway temperature of the battery cell. This prevents significant deformation of the first heat-resistant component 130 and the second heat-resistant component 150 during thermal runaway of the battery cell, maintaining good support for the lower insulating component 120 or the core package.

[0089] In some embodiments, the materials of the first heat-resistant component 130 and the second heat-resistant component 150 may include materials that can withstand high temperatures, such as metals or ceramics, and there are no limitations herein.

[0090] 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.

[0091] The energy storage battery provided in this application embodiment provides a first heat-resistant element 130 between the lower insulator 120 and the cover 110 of the cover assembly 100. This creates a gap between the cover 110 and the lower insulator 120 at the venting structure 1101 of the cover 110, and the first heat-resistant element 130 is fixedly connected to the cover 110 or the lower insulator 120. This ensures that the position of the first heat-resistant element 130 remains stable. Furthermore, due to the high-temperature resistance of the first heat-resistant element 130, when the lower insulator 120 of the cover assembly 100 is affected by the high temperature of the energy storage battery's core pack... After a certain degree of melting, softening, and deformation occurs, the first heat-resistant component 130 will not undergo significant deformation under the influence of high temperature. This allows the first heat-resistant component 130 to support the lower insulating component 120 or the core package, ensuring that the core package and the cover 110 always maintain a certain distance. The core package will not move toward the cover 110 and block the venting structure 1101 of the cover 110. This ensures that the venting structure 1101 of the cover 110 remains connected to the interior of the energy storage battery, allowing the high-pressure gas inside the energy storage battery to continue to be discharged through the venting structure 1101.

[0092] The energy storage battery may include a casing and a core pack, with the core pack disposed inside the casing. The casing includes a cover assembly 100, with the lower insulating member 120 of the cover assembly 100 located on the side of the cover 110 facing the core pack.

[0093] This application also provides a cover plate assembly.

[0094] Figure 11 is an exploded structural diagram of an embodiment of the cover plate assembly provided in this application. Figure 12 is an enlarged view of point C in Figure 11. As shown in Figures 11 and 12, the cover plate assembly 100 includes a cover 110 and a lower insulating member 120, which is disposed opposite to the cover 110. When the cover plate assembly 100 is used in an energy storage battery, the lower insulating member 120 of the cover plate assembly 100 is located on the side of the cover 110 facing the core pack of the energy storage battery, thereby insulating and isolating the cover 110 and the core pack through the lower insulating member 120.

[0095] As shown in Figures 11 to 13, the cover 110 is provided with a venting structure 1101. When the pressure inside the energy storage battery is too high, it can be discharged through the venting structure 1101 of the cover 110. The venting structure 1101 can be formed by opening 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 discharged through the venting hole.

[0096] 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.

[0097] In some embodiments, the lower insulating member 120 has a through hole 1200, and the cover plate assembly 100 may further include a third heat-resistant member 130a, which is located on the side of the cover 110 facing the lower insulating member 120. The third heat-resistant member 130a is configured to pass through the through hole 1200 of the lower insulating member 120 and abut against the core package located on the side of the lower insulating member 120 away from the cover 110, so that there is a gap between the core package and the cover 110 at the venting structure 1101 of the cover 110.

[0098] The cover assembly 100 provided in this application embodiment has a third heat-resistant element 130a provided on the side of the cover 110 facing the lower insulator 120. The third heat-resistant element 130a passes through the through hole 1200 of the lower insulator 120 and abuts against the core package located on the side of the lower insulator 120 away from the cover 110, so that there is a gap between the core package and the cover 110 at the venting structure 1101 of the cover 110. Due to the high temperature resistance of the third heat-resistant element 130a, when the lower insulator 120 of the cover assembly 100 is affected by the high temperature of the energy storage battery core package, it will undergo a certain degree of melting, softening and deformation. Subsequently, the third heat-resistant component 130a will not undergo significant deformation under the influence of high temperature, thereby enabling the third heat-resistant component 130a to stably support the core pack, ensuring that the core pack and the cover 110 always maintain a certain distance at the exhaust structure 1101 of the cover 110. The core pack will not move toward the cover 110 and block the exhaust structure 1101 of the cover 110. When the explosion-proof valve 140 is opened, the exhaust structure 1101 of the cover 110 can maintain communication with the interior of the energy storage battery, so that the high-pressure gas inside the energy storage battery can continue to be discharged through the exhaust structure 1101.

[0099] In this embodiment, the third heat-resistant component 130a can be fixedly connected to the cover 110 or the lower insulating component 120, thereby stabilizing the position of the third heat-resistant component 130a relative to the venting structure 1101. This helps to maintain a stable gap between the cover 110 and the lower insulating component 120 at the venting structure 1101 of the cover 110. The third heat-resistant component 130a can be welded to the cover 110, or it can be injection molded to the lower insulating component 120. Alternatively, the lower insulating component 120 and the cover 110 can clamp the third heat-resistant component 130a to position it, thus fixing its position relative to the cover 110 and the lower insulating component 120.

[0100] Figure 13 is a cross-sectional view of an embodiment of the cover plate assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover. Figure 14 is an enlarged view of point D in Figure 13. Figure 15 is a structural schematic diagram of an embodiment of the third heat-resistant component provided in this application. As shown in Figures 13 to 15, the third heat-resistant component 130a may include a second support portion 1301a and two second connecting portions 1303a. The two second connecting portions 1303a respectively abut against the side of the cover 110 facing the lower insulating member 120, so that there is a gap between the second support portion 1301a and the cover 110 at the exhaust structure 1101 of the cover 110, so that gas can be discharged from the exhaust structure 1101 after passing through the gap between the second support portion 1301a and the cover 110 at the exhaust structure 1101 of the cover 110. The second support portion 1301a may be configured to pass through the through hole 1200 of the lower insulator 120 and abut against the core package located on the side of the lower insulator 120 opposite to the cover 110, so that there is a gap between the core package and the cover 110 at the venting structure 1101 of the cover 110.

[0101] The two second connecting portions 1303a can be respectively protruding from the side of the second support portion 1301a facing the cover 110, so that after the two second connecting portions 1303a respectively abut against the side of the cover 110 facing the lower insulating member 120, the second support portion 1301a and the cover 110 form a gap at the exhaust structure 1101 of the cover 110.

[0102] Alternatively, the two second connecting portions 1303a can be arranged along the width direction of the cover 110 so that the two second connecting portions 1303a can more stably support the second support portion 1301a.

[0103] As shown in Figures 14 and 15, the third heat-resistant component 130a includes an exhaust channel 1300 that communicates with the exhaust structure 1101 of the cover 110, so that after the explosion-proof valve 140 is opened, the gas inside the energy storage battery can be discharged from the exhaust structure 1101 of the cover 110 through the exhaust channel 1300.

[0104] In some embodiments, the flow area of ​​the exhaust channel 1300 can be greater than or equal to the flow area of ​​the explosion-proof valve 140 after it is opened. This allows the gas inside the energy storage battery to pass through the exhaust channel 1300 more quickly and be discharged from the exhaust structure 1101 of the cover 110, avoiding the impact of the third heat-resistant element 130a on the exhaust speed of the energy storage battery.

[0105] In some embodiments, as shown in Figures 14 and 15, the exhaust channel 1300 includes a first channel 1302a, which penetrates the second support portion 1301a along the thickness direction Z of the cover 110, so that the first channel 1302a can correspond to the position of the exhaust structure 1101 and the explosion-proof valve 140. When the explosion-proof valve 140 is opened, the gas inside the energy storage battery can be quickly discharged from the exhaust structure 1101 through the first channel 1302a.

[0106] Additionally, the exhaust channel 1300 may also include a second channel 1306, which is located between the two second connecting portions 1303a of the third heat-resistant component 130a and extends through the third heat-resistant component 130a along the length direction X of the cover 110. The length direction X, width direction Y, and thickness direction Z of the cover 110 are perpendicular to each other. Thus, the gas located on both sides of the third heat-resistant component 130a along the length direction X of the cover 110 can pass through the second channel 1306 and then be discharged through the explosion-proof valve 140 and the exhaust structure 1101, thereby further increasing the flow area of ​​the exhaust channel 1300. This allows the gas inside the energy storage battery to quickly pass through the exhaust channel 1300 of the third heat-resistant component 130a and be discharged from the exhaust structure 1101 after the explosion-proof valve 140 is opened.

[0107] Specifically, when the exhaust passage 1300 includes a first passage 1302a and a second passage 1036, the flow area of ​​the exhaust passage 1300 is the sum of the flow areas of the first passage 1302a and the second passage 1036. When the exhaust passage 1300 includes only the first passage 1302a or the second passage 1036, the flow area of ​​the exhaust passage 1300 is the flow area of ​​either the first passage 1302a or the second passage 1036.

[0108] Specifically, the second support portion 1301a of the third heat-resistant component 130a is plate-shaped, and one side of the plate of the third heat-resistant component 130a is spaced apart from the cover 110. Second connecting portions 1303a are respectively provided at both ends of the second support portion 1301a along the width direction Y of the cover 110, and the second connecting portions 1303a extend along the length direction X of the cover 110. The second support portion 1301a and the two second connecting portions 1303a are an integral structure.

[0109] In some embodiments, the lower insulating member 120 may include a first protrusion 1201 corresponding to the venting structure 1101. The first protrusion 1201 may be configured to abut against the core package to restrict the core package from moving toward the cover 110, so that the core package cover 110 maintains a certain distance at the venting structure 1101 of the cover 110.

[0110] A through hole 1200 can be formed in the first protrusion 1201, and a first receiving cavity 1203 is formed between the first protrusion 1201 and the cover 110. The through hole 1200 and the venting structure 1101 are respectively connected to the first receiving cavity 1203. At least a portion of the third heat-resistant component 130a is disposed in the first receiving cavity 1203. Thus, the third heat-resistant component 130a can be positioned through the first receiving cavity 1203, making the position of the third heat-resistant component 130a more stable and the installation more convenient.

[0111] In some embodiments, the first protrusion 1201 may abut against the side of the third heat-resistant member 130a away from the cover 110 to restrict the third heat-resistant member 130a from moving toward the side away from the cover 110, thereby making the position of the third heat-resistant member 130a more stable.

[0112] The first protrusion 1201 may include two limiting surfaces 1210a located within the through hole 1200, with the two limiting surfaces 1210a disposed opposite to each other. The distance between the two limiting surfaces 1210a gradually decreases in the direction away from the cover 110.

[0113] Correspondingly, the third heat-resistant component 130a includes two first abutting surfaces 1307, which abut against two limiting surfaces 1210a in a one-to-one manner, thereby limiting the third heat-resistant component 130a by the two limiting surfaces 1210a and restricting the third heat-resistant component 130a from moving toward the side away from the cover 110.

[0114] The two limiting surfaces 1210a can be distributed along the length direction X of the cover 110 on both sides of the through hole 1200. Alternatively, the two limiting surfaces 1210a can be distributed along the width direction Y of the cover 110 on both sides of the through hole 1200. Furthermore, the distribution direction of the two limiting surfaces 1210a can be set at an angle to both the length direction X and the width direction Y of the cover 110. The specific arrangement depends on the structure of the third heat-resistant component 130a and the lower insulating component 120.

[0115] Specifically, the two limiting surfaces 1210a of the first protrusion 1201 are distributed on both sides of the through hole 1200 along the length direction X of the cover 110. The limiting surfaces 1210a are planar and parallel to the width direction Y of the cover 110. The two first abutting surfaces 1307 of the third heat-resistant element 130a are distributed on both sides of the third heat-resistant element 130a along the length direction X of the cover 110. The distance between the two first abutting surfaces 1307 gradually decreases in the direction away from the cover 110. The first abutting surfaces 1307 are planar and parallel to the corresponding limiting surfaces 1210a.

[0116] Therefore, when the two first abutting surfaces 1307 abut against the two limiting surfaces 1210a one by one, the first abutting surfaces 1307 can fit with the corresponding limiting surfaces 1210a, which helps to improve the limiting effect of the first protrusion 1201 on the third heat-resistant component 130a.

[0117] As shown in Figures 14 and 15, the third heat-resistant component 130a includes a second support portion 1301a and two second connecting portions 1303a. The two second connecting portions 1303a respectively abut against the side of the cover 110 facing the lower insulating component 120, so that there is a gap between the second support portion 1301a and the cover 110 at the exhaust structure 1101. In some embodiments, the two first abutting surfaces 1307 can be located on both sides of the second support portion 1301a, so that the two first abutting surfaces 1307 abut against the two limiting surfaces 1210a one-to-one, which has a better limiting effect on the second support portion 1301a.

[0118] In some embodiments, as shown in FIG12, at least one first pressure relief hole 1204a penetrating the first protrusion 1201 may be provided on at least one limiting surface 1210a. The gap between the second support portion 1301a of the third heat-resistant member 130a and the cover 110 communicates with at least one first pressure relief hole 1204a. Thus, when the pressure inside the energy storage battery is too high, the high-pressure gas inside the energy storage battery can pass sequentially through the first pressure relief hole 1204a and the gap between the second support portion 1301a and the cover 110, and then be discharged from the exhaust structure 1101. The provision of the first pressure relief hole 1204a increases the flow area of ​​the first protrusion 1201 for high-pressure gas to pass through, which is beneficial to improving the pressure relief efficiency.

[0119] Specifically, multiple first pressure relief holes 1204a are respectively provided on the two limiting surfaces 1210a, and the multiple first pressure relief holes 1204a on the same limiting surface 1210a are spaced apart along the width direction Y of the cover 110, so as to further increase the flow area of ​​the first protrusion 1201 for high pressure gas to pass through.

[0120] In some embodiments, as shown in FIG12, a recessed groove 122 may be formed on the surface of the lower insulating member 120 near the cover 110. The groove 122 corresponds to the exhaust structure 1101, and a second pressure relief hole 1221 is provided on the bottom surface of the groove 122, which penetrates the lower insulating member. By forming a recessed groove 122 corresponding to the exhaust structure 1101 on the surface of the lower insulating member 120 near the cover 110, a certain gap can be maintained between the bottom surface of the groove 122 and the cover 110. When the second pressure relief hole 1221 is provided on the bottom surface of the groove 122, the second pressure relief hole 1221 can be stably connected to the exhaust structure 1101 through the gap between the bottom surface of the groove 122 and the cover 110. When the internal pressure of the energy storage battery is too high, the high-pressure gas inside the battery can pass through the second pressure relief hole 1221 and the gap between the bottom surface of the sink 122 and the cover 110 in sequence, and then be discharged from the exhaust structure 1101. The setting of the second pressure relief hole 1221 increases the flow area of ​​the lower insulating member 120 for high-pressure gas to pass through, which is beneficial to improving the pressure relief efficiency.

[0121] As shown in FIG14, the first protrusion 1201 has a second abutment surface 1206a on the side opposite to the cap 110, which is configured to abut against the core package. In some embodiments, the first protrusion 1201 further includes a transition surface 1207a extending from the second abutment surface 1206a to the limiting surface 1210a, the transition surface 1207a extending along the thickness direction Z of the cap 110.

[0122] Understandably, since the distance between the two limiting surfaces 1210a gradually decreases in the direction away from the cap 110, if the limiting surface 1210a extends directly to the side of the first protrusion 1201 away from the cap 110 and intersects with the second abutting surface 1206a, a sharp acute angle structure will be formed at the intersection of the limiting surface 1210a and the second abutting surface 1206a. When the second abutting surface 1206a abuts against the core package, the acute angle structure is likely to scratch the core package.

[0123] In this embodiment, the first protrusion 1201 further includes a transition surface 1207a extending from the second abutment surface 1206a to the limiting surface 1210a. The transition surface 1207a extends along the thickness direction Z of the cover 110, which allows the angle formed at the intersection of the transition surface 1207a and the second abutment surface 1206a to be larger, which helps to reduce the risk of scratching the core package at the intersection of the transition surface 1207a and the second abutment surface 1206a.

[0124] It should be noted that the transition surface 1207a can be parallel to the thickness direction Z of the cover 110, or it can form a small angle with the thickness direction Z of the cover 110, as long as the intersection of the transition surface 1207a and the second contact surface 1206a is not likely to scratch the core package.

[0125] Specifically, transition surfaces 1207a are formed between the two limiting surfaces 1210a and the second abutment surface 1206a. The two transition surfaces 1207a are distributed on both sides of the through hole 1200 along the length direction X of the cover 110. The transition surfaces 1207a are perpendicular to the thickness direction Z of the cover 110 and perpendicular to the second abutment surface 1206a. The third heat-resistant component 130a includes a second support portion 1301a, which includes a mating portion 1304a located between the two transition surfaces 1207a. The shape of the mating portion 1304a is adapted to the shape of a portion of the through hole 1200 located between the two transition surfaces 1207a.

[0126] In some embodiments, as shown in FIG14, the surface of the third heat-resistant member 130a facing away from the cover 110 can be flush with the surface of the first protrusion 1201 facing away from the cover 110. Thus, both the third heat-resistant member 130a and the first protrusion 1201 of the lower insulating member 130 can abut against the core package to support it.

[0127] Specifically, the thickness of the third heat-resistant component 130a in the thickness direction Z of the cover 110 can be made equal to the thickness of the first protrusion 1201 of the lower insulating component 120 in the thickness direction Z of the cover 110, so that after the third heat-resistant component 130a abuts against the side of the cover 110 facing the lower insulating component 120, the surface of the third heat-resistant component 130a away from the cover 110 is flush with the surface of the first protrusion 1201 away from the cover 110.

[0128] In other embodiments, the third heat-resistant element 130a may extend beyond the surface of the first protrusion 1201 facing away from the cap 110, such that the distance from the surface of the third heat-resistant element 130a facing away from the cap 110 to the cap 110 is greater than the distance from the surface of the first protrusion 1201 facing away from the cap 110 to the cap 110. In this case, the core package is mainly supported by the third heat-resistant element 130a, so that there is a gap between the core package and the cap 110 at the venting structure 1101 of the cap 110.

[0129] Alternatively, the distance from the surface of the third heat-resistant element 130a facing away from the cover 110 to the cover 110 can be less than the distance from the surface of the first protrusion 1201 facing away from the cover 110 to the cover 110. In this case, the core package is mainly supported by the lower insulation element 120, so that there is a gap between the core package and the cover 110 at the venting structure 1101 of the cover 110. When the lower insulation element 120 deforms, the core package is again supported by the third heat-resistant element 130a, so that there is a gap between the core package and the cover 110 at the venting structure 1101 of the cover 110.

[0130] In some embodiments, as shown in FIG15, the width of the third heat-resistant element 130a along the width direction Y of the cover 110 is L, and L satisfies: L≥(a-1)*H; where a is the number of core packages and is greater than or equal to 2; H is the thickness of the core package in the width direction Y of the cover 110.

[0131] Therefore, when the energy storage battery includes multiple core packs arranged along the width direction Y of the cover 110, the width L of the third heat-resistant member 130a along the width direction Y of the cover 110 can be made large enough so that the high-pressure gas at each core pack can be discharged from the exhaust structure 1101 through the exhaust channel 1300 of the third heat-resistant member 130a.

[0132] In some embodiments, as shown in Figures 11 and 12, the lower insulating member 120 includes two sub-plastics 121 separately disposed along the length X of the cover 110. A first protrusion 1201 of the lower insulating member 120 includes sub-protrusions 1202 distributed among the two sub-plastics 121. A first receiving cavity 1203 is formed between the two sub-protrusions 1202 and the cover 110. A through hole 1200 is formed between the two sub-protrusions 1202. By dividing the lower insulating member 120 into two sub-plastics 121, the processing of the lower insulating member 120 becomes more convenient.

[0133] In this embodiment, the lower insulating member 120 can be made of plastic or other insulating materials, and there are no limitations on this. Specifically, the lower insulating member 120 can be made of plastic. Additionally, the cover 110 can be made of metal. Specifically, the cover 110 can be a sheet of aluminum.

[0134] In this embodiment, the melting temperature of the third heat-resistant component 130a can be greater than that of the lower insulating component 120. This means that when the lower insulating component 120 deforms or even melts under high temperatures, the melting or deformation of the third heat-resistant component 130a is less, thus providing better support for the core package. Furthermore, the melting temperature of the third heat-resistant component 130a can be greater than the thermal runaway temperature of the battery cell. This ensures that in the event of thermal runaway of the battery cell, the third heat-resistant component 130a will not undergo significant deformation, maintaining good support for the core package.

[0135] In some embodiments, the material of the third heat-resistant component 130a may include materials capable of withstanding high temperatures, such as metals and / or ceramics, without limitation. It is understood that the material of the third heat-resistant component 130a may be entirely metal or ceramic, or the material of the third heat-resistant component 130a may be a combination of ceramics.

[0136] 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.

[0137] The energy storage battery provided in this embodiment of the application has a third heat-resistant element 130a provided on the side of the cover 110 of the cover assembly 100 facing the lower insulator 120. The third heat-resistant element 130a passes through the through hole 1200 of the lower insulator 120 and abuts against the core pack located on the side of the lower insulator 120 away from the cover 110. This results in a gap between the core pack and the cover 110 at the venting structure 1101 of the cover 110. Due to the high temperature resistance of the third heat-resistant element 130a, when the lower insulator 120 of the cover assembly 100 is affected by the high temperature of the energy storage battery core pack, a certain degree of melting and softening occurs. After deformation, the third heat-resistant component 130a will not undergo significant deformation under high temperature, thus enabling the third heat-resistant component 130a to stably support the core pack. This ensures that the core pack and the cover 110 always maintain a certain distance at the exhaust structure 1101 of the cover 110, preventing the core pack from moving towards the cover 110 and blocking the exhaust structure 1101. When the explosion-proof valve 140 is opened, the exhaust structure 1101 of the cover 110 can remain connected to the interior of the energy storage battery, allowing the high-pressure gas inside the energy storage battery to continue to be discharged through the exhaust structure 1101.

[0138] The energy storage battery may include a casing and a core pack, with the core pack disposed inside the casing. The casing includes a cover assembly 100, with the lower insulating member 120 of the cover assembly 100 located on the side of the cover 110 facing the core pack.

[0139] In some embodiments, the energy storage battery may include multiple cell packs, which are stacked along the width direction Y of the cover 110. The thickness direction of the cell packs is parallel to the width direction Y of the cover 110.

[0140] In related technologies, the top surface of the cover of the energy storage battery is insulated from the output electrode 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 lead to the risk of short circuit due to contact between the output electrode and the cover.

[0141] Meanwhile, after the upper insulating component undergoes a certain degree of melting, softening, and deformation, the compression of the sealing structure between the output electrode and the cover may change, resulting in a weakening of the sealing effect. When the pressure inside the energy storage battery is too high, there may be a risk that the electrolyte inside the energy storage battery may leak out from the gap between the output electrode and the cover.

[0142] Therefore, embodiments of this application provide a cover plate assembly and an energy storage battery.

[0143] Figure 16 is an exploded structural diagram of an embodiment of the cover assembly provided in this application. Figure 17 is a cross-sectional view of an embodiment of the cover assembly provided in this application, wherein the cutting plane is perpendicular to the width direction of the cover. Figure 18 is an enlarged view of point E in Figure 17. As shown in Figures 16 to 18, 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.

[0144] The cover assembly 100 also includes an output electrode 180, which is installed in the mounting hole 1102 of the cover 110, and the output electrode 180 includes a pressure ring 181 disposed opposite to the top surface 1104.

[0145] In some embodiments, the cover assembly 100 may further include a fourth heat-resistant element 170 disposed between the top surface 1104 of the cover 110 and the pressure ring 181 of the output electrode 180, so that there is a gap between the cover 110 and the pressure ring 181.

[0146] The cover assembly 100 provided in this application embodiment provides a fourth heat-resistant element 170 between the pressure ring 181 of the output electrode 180 and the bottom surface 1103 of the cover 110, so that there is a gap between the cover 110 and the pressure ring 181. Due to the high temperature resistance of the fourth heat-resistant element 170, when the upper insulating element 160 of the cover assembly 100 undergoes a certain degree of melting, softening and deformation under the influence of the high temperature of the battery pack, the fourth heat-resistant element 170 will not undergo large deformation under the influence of high temperature. Thus, the fourth heat-resistant element 170 can support the upper insulating element 160 or the pressure ring 181 of the output electrode 180, so that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 always maintain a certain gap, thereby reducing the risk of short circuit caused by the pressure ring 181 of the output electrode 180 contacting the top surface 1104 of the cover 110.

[0147] Furthermore, the fourth heat-resistant component 170 ensures that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 are always kept at a certain distance. When the upper insulating component 160 undergoes a certain degree of melting, softening, and deformation, the compression change of the sealing structure 190 between the output electrode 180 and the cover 110 can be reduced. This helps to reduce the risk of electrolyte leakage from the output electrode 180 and the cover 110 due to the failure of the sealing structure 190.

[0148] In this embodiment, the melting temperature of the fourth heat-resistant component 170 can be greater than that of the upper insulating component 160. This means that when the upper insulating component 160 deforms or even melts under high temperatures, the melting or deformation of the fourth heat-resistant component 170 is less, thus providing better support for the upper insulating component 160 or the pressure ring 181 of the output electrode 180. Furthermore, the melting temperature of the fourth heat-resistant component 170 can be greater than the thermal runaway temperature of the battery cell. This ensures that in the event of thermal runaway of the battery cell, the fourth heat-resistant component 170 will not undergo significant deformation, and will still provide good support for the upper insulating component 160 or the pressure ring 181 of the output electrode 180.

[0149] In some embodiments, the fourth heat-resistant element 170 is an insulating element. Consequently, the upper insulating element 160 undergoes a certain degree of melting and softening deformation, causing the fourth heat-resistant element 170 to pass through the contact portion between the upper insulating element 160 and the pressure ring 181 of the output electrode 180, thus preventing the pressure ring 181 of the output electrode 180 from conducting to the cover 110 through the fourth heat-resistant element 170. The material of the fourth heat-resistant element 170 may include ceramic or other insulating materials capable of withstanding high temperatures; this is not limited to these specific materials.

[0150] In some embodiments, as shown in FIG18, one end of the fourth heat-resistant element 170 can abut against the top surface 1104 of the cover 110, and the other end of the fourth heat-resistant element 170 can abut against the pressure ring 181 of the output electrode 180. Thus, the fourth heat-resistant element 170 is directly supported between the top surface 1104 of the cover 110 and the connection of the output electrode 180, which makes the gap between the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 more stable and less susceptible to the effects of melting, softening, and deformation of the upper insulating element 160.

[0151] As shown in Figures 16 to 18, the cover assembly 100 further includes an upper insulating member 160, which is disposed on the top surface 1104 of the cover 110. The upper insulating member 160 includes an insulating portion 161 located between the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110. The insulating portion 161 can support the pressure ring 181 of the output electrode 180, preventing the pressure ring 181 of the output electrode 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 output electrode 180 and the cover 110.

[0152] In some embodiments, a receiving hole 1611 extending along the thickness direction may be provided in the insulating portion 161 of the upper insulating member 160, and at least a portion of the fourth heat-resistant member 170 may be received within the receiving hole 1611, thereby allowing the insulating portion 161 of the upper insulating member 160 to avoid interference between the fourth heat-resistant member 170 and the insulating portion 161 of the upper insulating member 160. Moreover, by having at least a portion of the fourth heat-resistant member 170 received within the receiving hole 1611 of the upper insulating member 160, the position of the fourth heat-resistant member 170 relative to the output electrode 180 can be made more stable, which is beneficial for the fourth heat-resistant member 170 to provide more stable direct or indirect support to the pressure ring 181 of the output electrode 180.

[0153] The receiving hole 1611 can pass through the insulating part 161, and the fourth heat-resistant member 170 can pass through the receiving hole 1611, so that one end of the fourth heat-resistant member 170 can abut against the top surface 1104 of the cover 110, and the other end of the fourth heat-resistant member 170 can abut against the pressure ring 181 of the output electrode 180.

[0154] Figure 19 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, as shown in Figure 19, one end of the fourth heat-resistant member 170 may abut against the top surface 1104, and the other end of the fourth heat-resistant member 170 may abut against the insulating portion 161. Therefore, the fourth heat-resistant component 170 can indirectly abut against the pressure ring 181 of the output electrode 180 through the insulating part 161. When the upper insulating part 160 of the cover plate assembly 100 undergoes a certain degree of melting, softening and deformation under the influence of the high temperature of the energy storage battery core, the fourth heat-resistant component 170 will not undergo large deformation under the influence of high temperature. Thus, the fourth heat-resistant component 170 can support the insulating part 161 of the upper insulating part 160, so that the insulating part 161 of the upper insulating part 160 can stably support the pressure ring 181 of the output electrode 180. This ensures that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 always maintain a certain distance, thereby reducing the risk of short circuit caused by the contact between the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110.

[0155] Furthermore, when the upper insulating member 160 of the cover plate assembly 100 undergoes significant melting and softening deformation under the influence of the high temperature of the battery pack, the fourth heat-resistant member 170 can pass through the insulating part 161 of the insulating member and abut against the pressure ring 181 of the output electrode 180 to provide stable support for the pressure ring 181 of the output electrode 180. This ensures that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 always maintain a certain distance, thereby reducing the risk of short circuit caused by the contact between the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110.

[0156] As shown in Figure 19, the receiving hole 1611 can be a blind hole, with the opening of the receiving hole 1611 located on the side of the insulating portion 161 of the upper insulating member 160 near the top surface 1104 of the cover 110. Thus, when at least a portion of the fourth heat-resistant member 170 is received within the receiving hole 1611, the end of the fourth heat-resistant member 170 away from the bottom surface 1103 of the cover 110 can abut against the portion of the insulating portion 161 of the upper insulating member 160 near the closed end of the receiving hole 1611, thereby indirectly abutting against the pressure ring 181 of the output electrode 180 through the insulating portion 161 of the upper insulating member 160.

[0157] In some embodiments, as shown in FIG18, a positioning groove 1105 may be provided on the side of the pressure ring 181 facing the cover 110, and at least a portion of the fourth heat-resistant component 170 is located within the positioning groove 1105. Thus, the positioning groove 1105 can be used to position the fourth heat-resistant component 170 relative to the output electrode 180, allowing the fourth heat-resistant component 170 to more stably provide direct or indirect support to the pressure ring 181 of the output electrode 180.

[0158] In this configuration, the end of the fourth heat-resistant component 170 away from the top surface 1104 of the cover 110 can be made to abut against the bottom surface of the positioning groove 1105, thereby allowing the fourth heat-resistant component 170 to directly support the pressure ring 181 of the output electrode 180.

[0159] Alternatively, as shown in Figure 19, at least a portion of the insulating portion 161 of the upper insulating member 160 can be located within the positioning groove 1105, and the side of the insulating portion 161 of the upper insulating member 160 away from the top surface 1104 of the cover 110 abuts against the bottom surface of the positioning groove 1105. The closed end of the receiving hole 1611 extends into the positioning groove 1105 along the thickness direction of the cover 110, and the end of the fourth heat-resistant member 170 away from the top surface 1104 of the cover 110 extends into the positioning groove 1105 and abuts against the portion of the insulating portion 161 near the closed end of the receiving hole 1611.

[0160] In some embodiments, a portion of the fourth heat-resistant element 170 on the side near the axis of the output electrode 180 may be located in the positioning groove 1105, and another portion of the fourth heat-resistant element 170 may abut against the upper insulating element 160, thereby enabling the fourth heat-resistant element 170 to support the output electrode 180 more stably.

[0161] In some embodiments, as shown in FIG16, the number of fourth heat-resistant elements 170 can be multiple, and the multiple fourth heat-resistant elements 170 are arranged circumferentially along the output electrode 180. Multiple fourth heat-resistant elements 170 can more stably support the pressure ring 181 of the output electrode 180, thereby further reducing the risk of the pressure ring 181 of the output electrode 180 contacting the top surface 1104 of the cover 110. The number of fourth heat-resistant elements 170 can be two, three, four, or more, specifically determined according to the shape, material, etc., of the fourth heat-resistant elements 170.

[0162] 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 fourth heat-resistant members 170, and at least a portion of the plurality of fourth heat-resistant members 170 is received one-to-one in the plurality of receiving holes 1611.

[0163] In some embodiments, the fourth heat-resistant element 170 can extend circumferentially along the output electrode 180, thereby increasing the contact area between the fourth heat-resistant element 170 and the insulating portion 161 of the upper insulating element 160 or the pressure ring 181 of the output electrode 180, so as to more stably support the pressure ring 181 of the output electrode 180. The fourth heat-resistant element 170 can be a ring structure to improve its support effect on the output electrode 180.

[0164] Specifically, the output pole 180 includes a pole post 182, which passes through a mounting hole 1102. A pressure ring 181 protrudes from the outer periphery of the pole post 182. The pressure ring 181 extends circumferentially along the pole post 182 in a ring structure. One end of the pole post 182 extending out of the pressure ring 181 is configured to connect to a busbar. A fourth heat-resistant component 170 extends circumferentially along the pole post 182 in a ring structure. A positioning groove 1105 extends circumferentially along the pressure ring 181 in a ring structure. The positioning groove 1105 forms a slot on the outer periphery of the pressure ring 181. One end of the pole post 182 is connected to the pressure ring 181 by means of snap-fit, riveting, welding, etc. Of course, the pole post 182 can also be an integral structure with the pressure ring 181.

[0165] 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. The flange is configured to abut against the bottom surface 1103 of the cover 110 through the sealing structure 190 or the lower insulating member 120, thereby limiting the movement of the pole post 182 relative to the cover 110 in the thickness direction Z and preventing the pole post 182 from short-circuiting with the cover 110.

[0166] The sealing structure 190 is a sealing ring surrounding the pole post 182. One side of the sealing structure 190 abuts against the side of the flange facing the bottom surface 1103 of the cover 110, and the other side of the sealing structure 190 abuts against the bottom surface 1103 of the cover 110, thereby sealing the gap between the flange of the pole post 182 and the bottom surface 1103 of the cover 110. The pressure ring 181 of the output pole 180 is supported by the fourth heat-resistant element 170, which prevents the gap between the flange of the pole post 182 and the bottom surface 1103 of the cover 110 from increasing. This results in a greater compressive force on the sealing structure 190 from the flange of the pole post 182 and the bottom surface 1103 of the cover 110, thus improving the sealing effect of the position sealing structure 190.

[0167] Figure 20 is a top view of one embodiment of the fourth heat-resistant component provided in this application. In other embodiments, as shown in Figure 20, the fourth heat-resistant component 170 can also be a columnar structure extending along the thickness direction, thereby giving the fourth heat-resistant component 170 higher structural strength. Specifically, the fourth heat-resistant component 170 can be a cylindrical structure, a quadrangular prism structure, etc.

[0168] Figure 21 is a top view of another embodiment of the fourth heat-resistant component provided in this application. As shown in Figure 21, the fourth heat-resistant component 170 can also be a barrel-shaped structure extending along the thickness direction, thereby providing better support for the pressure ring 181 of the output electrode 180 or the insulating portion 161 of the upper insulating component 160, while reducing the material of the fourth heat-resistant component 170 and thus reducing its cost.

[0169] 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 configured as an energy storage battery, the lower insulator 120 of the cover assembly 100 is located on the side of the cover 110 facing the core pack of the energy storage battery, thereby insulating and isolating the cover 110 and the core pack through the lower insulator 120.

[0170] As shown in Figure 16, the cover 110 is provided with a venting structure 1101. When the internal pressure of the energy storage battery is too high, it can be discharged through the venting structure 1101 of the cover 110. The venting structure 1101 can be formed by opening 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 internal pressure of 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 discharged through the venting hole.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] The energy storage battery provided in this application embodiment has a fourth heat-resistant element 170 provided between the pressure ring 181 of the output electrode 180 of the cover assembly 100 and the bottom surface 1103 of the cover 110, so that there is a gap between the cover 110 and the pressure ring 181. Due to the high temperature resistance of the fourth heat-resistant element 170, when the upper insulating element 160 of the cover assembly 100 undergoes a certain degree of melting, softening and deformation under the influence of the high temperature of the energy storage battery core, the fourth heat-resistant element 170 will not undergo large deformation under the influence of high temperature. Thus, the fourth heat-resistant element 170 can support the upper insulating element 160 or the pressure ring 181 of the output electrode 180, so that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 always maintain a certain gap, thereby reducing the risk of short circuit caused by the pressure ring 181 of the output electrode 180 contacting the top surface 1104 of the cover 110.

[0175] Furthermore, the fourth heat-resistant component 170 ensures that the pressure ring 181 of the output electrode 180 and the top surface 1104 of the cover 110 are always kept at a certain distance. When the upper insulating component 160 undergoes a certain degree of melting, softening, and deformation, the compression change of the sealing structure 190 between the output electrode 180 and the cover 110 can be reduced. This helps to reduce the risk of electrolyte leakage from the output electrode 180 and the cover 110 due to the failure of the sealing structure 190, and thus improves the safety of the energy storage battery.

[0176] 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.

Claims

1. A cover plate assembly, comprising: The cap is equipped with a venting structure. The lower insulating element is disposed opposite to the cover; The cover assembly further includes a first heat-resistant element, which is installed between the cover and the lower insulating element to create a gap between the cover and the lower insulating element at the exhaust structure. The first heat-resistant element is fixedly connected to either the cover or the lower insulating element; or... The lower insulating member has a through hole, and the cover plate assembly also includes a third heat-resistant member. The third heat-resistant member is located on the side of the cover facing the lower insulating member. The third heat-resistant member is configured to pass through the through hole and abut against the core package located on the side of the lower insulating member away from the cover, so that there is a gap between the cover and the core package at the exhaust structure.

2. The cover plate assembly as claimed in claim 1, wherein, The first heat-resistant component is welded to the cover, or the first heat-resistant component is injection molded to the lower insulating component.

3. The cover plate assembly as claimed in claim 2, wherein, The first heat-resistant component includes a first support portion and at least one first connecting portion. The first support portion is configured to abut against the lower insulating component, and the at least one first connecting portion protrudes from the first support portion and is configured to be welded to the cover.

4. The cover plate assembly as claimed in claim 3, wherein, The first supporting portion has the first connecting portion protruding from the side facing the cover; and / or, The first support portion has the first connecting portion protruding from at least one side along the length or width direction of the cover, and the length, width and thickness directions of the cover are perpendicular to each other.

5. The cover plate assembly as claimed in claim 4, wherein, There are multiple first connecting parts, and each of the multiple first connecting parts is welded to the cover.

6. The cover plate assembly as claimed in claim 5, wherein, Multiple first connecting portions are distributed on both sides of the first support portion along the length direction, and multiple first connecting portions located on the same side edge of the first support portion are spaced apart along the width direction; or... Multiple first connecting portions are distributed on both sides of the first support portion along the width direction, and multiple first connecting portions located on the same side edge of the first support portion are spaced apart along the length direction.

7. The cover plate assembly as claimed in claim 5, wherein, A plurality of the first connecting portions are distributed on both sides of the exhaust structure along the length direction; and / or, a plurality of the first connecting portions are distributed on both sides of the exhaust structure along the width direction.

8. The cover plate assembly as claimed in any one of claims 1 to 7, wherein, The lower insulating component includes a first protrusion corresponding to the exhaust structure. The first protrusion has a through hole communicating with the exhaust structure. The first heat-resistant component is installed between the cover and the first protrusion.

9. The cover plate assembly as claimed in claim 8, wherein, A first receiving cavity is formed between the first protrusion and the cover, the through hole and the venting structure are respectively connected to the first receiving cavity, and at least a portion of the first heat-resistant component is located in the first receiving cavity.

10. The cover plate assembly of claim 9, wherein, The first protrusion has an abutting protrusion on the side facing the cover. The abutting protrusion is located in the first receiving cavity. The abutting protrusion abuts against the side of the first heat-resistant element away from the cover so that the first heat-resistant element is spaced apart from the through hole.

11. The cover plate assembly of claim 10, wherein, The first heat-resistant component includes a first support portion and a plurality of first connecting portions. The first support portion is configured to abut against the abutting protrusion. The first support portion has a through hole that penetrates the first support portion along the thickness direction of the cover. The plurality of first connecting portions are spaced apart and configured to connect to the cover. The through hole includes a first through hole formed on the bottom surface of the first receiving cavity, which is disposed opposite to the through hole; the through hole also includes a second through hole formed on the side surface of the first receiving cavity, which is disposed opposite to the interval between two adjacent first connecting portions.

12. The cover plate assembly of claim 10, wherein, The abutting protrusion includes a first protrusion and a second protrusion. The first protrusion and the second protrusion abut against the side of the first heat-resistant component away from the cover, respectively. The extension directions of the first protrusion and the second protrusion are set at an angle, and the extension directions of the first protrusion and the second protrusion are set at an angle to the thickness direction of the cover, respectively.

13. The cover plate assembly of claim 9, wherein, The lower insulating component includes two sub-plastics separately arranged along the length direction of the cover. The first protrusion includes sub-protrusions distributed on the two sub-plastics, and the first receiving cavity is formed between the two sub-protrusions and the cover.

14. The cover plate assembly of claim 13, wherein, The first heat-resistant component includes at least two sub-heat-resistant components spaced apart, which are respectively installed between the cover and the lower insulation component, such that there is a gap between the cover and the lower insulation component at the exhaust structure.

15. The cover plate assembly of claim 14, wherein, Each of the sub-protrusions is provided in correspondence with at least one of the sub-temperature-resistant elements.

16. The cover plate assembly as claimed in any one of claims 1 to 7, wherein, The cover assembly further includes at least one second heat-resistant element, which is disposed on the side of the cover facing the lower insulator and located at the end of the cover in the length direction.

17. The cover plate assembly of claim 16, wherein, The lower insulating member includes at least one second protrusion, the second protrusion having a second receiving cavity formed on the side facing the cover, and the second heat-resistant member being disposed within the second receiving cavity.

18. The cover plate assembly of claim 17, wherein, The cover assembly includes two second heat-resistant components located at both ends of the cover along its length; the lower insulating component includes two second protrusions, each forming a second receiving cavity on the side of the two protrusions facing the cover, and the two second heat-resistant components are correspondingly disposed in the two second receiving cavities.

19. The cover plate assembly of claim 16, wherein, The material of the second heat-resistant component includes metal or ceramic; the second heat-resistant component is welded to the cover, or the second heat-resistant component is injection molded to the lower insulating component.

20. The cover plate assembly of claim 1, wherein, The third heat-resistant component includes a second support portion and two second connecting portions, the two second connecting portions respectively abutting against the side of the cover facing the lower insulating component, so that there is a gap between the second support portion and the cover at the exhaust structure.

21. The cover plate assembly of claim 20, wherein, The cover plate assembly also includes an explosion-proof valve disposed in the exhaust structure, and the third heat-resistant component includes an exhaust channel communicating with the exhaust structure, wherein the flow area of ​​the exhaust channel is greater than or equal to the flow area of ​​the explosion-proof valve after it is opened.

22. The cover plate assembly of claim 21, wherein, The exhaust channel includes a first channel that extends through the second support portion along the thickness direction of the cover.

23. The cover plate assembly of claim 21, wherein, The two second connecting parts protrude from the side of the second support portion facing the cover, and the two second connecting parts are arranged along the width direction of the cover; The exhaust channel also includes a second channel, which is located between the two second connecting portions and extends through the third heat-resistant component along the length direction of the cover. The length direction, width direction and thickness direction of the cover are perpendicular to each other.

24. The cover plate assembly as claimed in any one of claims 20 to 23, wherein, The lower insulating member includes a first protrusion corresponding to the exhaust structure. The first protrusion has the through hole. A first receiving cavity is formed between the first protrusion and the cover. The through hole and the exhaust structure are respectively connected to the first receiving cavity. At least a portion of the third heat-resistant member is located in the first receiving cavity.

25. The cover plate assembly of claim 24, wherein, The first protrusion abuts against the side of the third heat-resistant element away from the cover to restrict the third heat-resistant element from moving toward the side away from the cover.

26. The cover plate assembly of claim 25, wherein, The first protrusion includes two limiting surfaces located within the through hole, the two limiting surfaces being disposed opposite to each other; the distance between the two limiting surfaces gradually decreases in the direction away from the cover; The third heat-resistant component includes two first abutting surfaces, which abut against the two limiting surfaces one by one.

27. The cover plate assembly of claim 26, wherein, The third heat-resistant component includes a second support portion and two second connecting portions. The two second connecting portions abut against the side of the cover facing the lower insulating component, so that there is a gap between the second support portion and the cover at the exhaust structure. The two first abutting surfaces are located on both sides of the second support portion.

28. The cover plate assembly of claim 27, wherein, At least one of the limiting surfaces is provided with at least one first pressure relief hole penetrating the first protrusion; the gap between the second support and the cover communicates with at least one of the first pressure relief holes.

29. The cover plate assembly of claim 26, wherein, The first protrusion has a second abutting surface on the side opposite to the cap, which is configured to abut against the core package. The first protrusion also includes a transition surface extending from the second abutting surface to the limiting surface, the transition surface extending along the thickness direction of the cap.

30. The cover plate assembly of claim 26, wherein, The two limiting surfaces are distributed on both sides of the through hole along the length of the cover.

31. The cover plate assembly of claim 24, wherein, The surface of the third heat-resistant component facing away from the cover is flush with the surface of the first protrusion facing away from the cover.

32. The cover plate assembly as claimed in any one of claims 20 to 23, wherein, The surface of the lower insulating member near the cover is recessed to form a groove, the groove is provided corresponding to the exhaust structure, and a second pressure relief hole is provided on the bottom surface of the groove, the second pressure relief hole penetrating the lower insulating member.

33. The cover plate assembly as claimed in any one of claims 20 to 23, wherein, The width of the third heat-resistant component along the width direction of the cover is L, where L ≥ * H; where a is the number of the core packages, and is greater than or equal to 2; and H is the thickness of the core package in the width direction of the cover.

34. The cover plate assembly as claimed in any one of claims 1 to 33, wherein, The materials of the first heat-resistant component and / or the third heat-resistant component include metal or ceramic.

35. The cover plate assembly as claimed in any one of claims 1 to 33, wherein, The 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; The cover plate assembly further includes an output electrode and a fourth heat-resistant component. The output electrode is installed in the mounting hole and includes a pressure ring disposed opposite to the top surface. The fourth heat-resistant component is disposed between the top surface and the pressure ring to create a gap between the cover and the pressure ring.

36. The cover plate assembly of claim 35, wherein, The cover plate assembly further includes an upper insulating member disposed on the top surface of the cover. The upper insulating member includes an insulating portion located between the pressure ring and the top surface. One end of the fourth heat-resistant member abuts against the top surface, and the other end of the fourth heat-resistant member abuts against the insulating portion.

37. The cover plate assembly of claim 36, wherein, The insulating part has a receiving hole extending along the thickness direction. The receiving hole is a blind hole, and the opening of the receiving hole is located on the side of the insulating part near the top surface. At least a portion of the fourth heat-resistant element is received in the receiving hole.

38. The cover plate assembly of claim 35, wherein, The fourth heat-resistant component is an insulating component. One end of the fourth heat-resistant component abuts against the top surface, and the other end of the fourth heat-resistant component abuts against the pressure ring.

39. The cover plate assembly of claim 38, wherein, The cover plate assembly further includes an upper insulating member disposed on the top surface of the cover. The upper insulating member includes an insulating portion located between the pressure ring and the top surface. The insulating portion has a receiving hole extending along the thickness direction. The receiving hole penetrates the insulating portion, and the fourth heat-resistant member passes through the receiving hole.

40. The cover plate assembly of claim 39, wherein, The pressure ring has a positioning groove on the side facing the cover, and at least a portion of the fourth heat-resistant component is located in the positioning groove.

41. The cover plate assembly of claim 40, wherein, A portion of the fourth heat-resistant component, located near the output pole axis, is situated within the positioning groove, while the other portion abuts against the upper insulating component.

42. The cover plate assembly according to any one of claims 35 to 41, wherein, The number of the fourth heat-resistant components is multiple, and the multiple fourth heat-resistant components are arranged circumferentially along the output electrode.

43. The cover plate assembly according to any one of claims 35 to 41, wherein, The fourth heat-resistant element extends circumferentially along the output electrode; the fourth heat-resistant element has a ring structure.

44. The cover plate assembly according to any one of claims 35 to 41, wherein, The material of the fourth heat-resistant component includes ceramic.

45. The cover plate assembly according to any one of claims 35 to 41, wherein, The output electrode includes a terminal post that passes through the mounting hole, and the pressure ring protrudes from the outer periphery of the terminal post.

46. ​​An energy storage battery comprising the cover assembly as described in any one of claims 1 to 45.

Images