Top cover assembly, battery and energy storage system

Abstract

The utility model relates to the technical field of new energy, in particular to a top cover assembly, a battery and an energy storage system. A top cover assembly includes: an explosion-proof valve; an anti-explosion hole is formed in the top cover plate, the anti-explosion hole penetrates through the top cover plate in the thickness direction of the top cover plate, and the anti-explosion valve is installed in the anti-explosion hole; the protruding part is arranged on the outer surface of the top cover plate in a protruding mode and located on the periphery of the anti-explosion hole, an exhaust groove is formed in the surface, away from the top cover plate, of the protruding part, one end of the exhaust groove communicates with the anti-explosion hole, and the other end of the exhaust groove communicates with the atmosphere; and the anti-explosion valve protection piece is arranged in the anti-explosion hole, and the anti-explosion valve protection piece can cover the anti-explosion valve and the protruding part. According to the top cover assembly, the exhaust grooves are formed in the outer surface of the top cover plate in the protruding mode, so that the structures of the exhaust paths of the exhaust grooves have no difference, it is guaranteed that the depths of the exhaust grooves are consistent, and therefore the smoothness of exhaust is guaranteed.

Description

Technical Field

[0001] This application relates to the field of secondary battery technology, and in particular to a top cover assembly, a battery, and an energy storage system. Background Technology

[0002] The battery mainly consists of a casing and a top cover assembly. The top cover assembly includes a top cover plate, which covers the opening in the casing to provide a seal. To ensure the battery can safely release pressure when necessary, the top cover plate has a through-hole in the thickness direction, and an explosion-proof valve is embedded within the explosion-proof hole. Furthermore, an explosion-proof valve protection plate is used to protect the explosion-proof valve. In related technologies, to prevent a closed space from forming between the explosion-proof valve, the explosion-proof hole, and the explosion-proof valve protection plate, venting grooves are usually designed around the explosion-proof hole to ensure that the space between the explosion-proof valve and the explosion-proof valve protection plate remains open to the outside atmosphere.

[0003] However, in the existing technology, during the stamping of the venting groove, more material is squeezed on one side of the venting groove than on the other side. As a result, the wear of the punch is inconsistent, which leads to insufficient stamping depth of the venting groove. In particular, the venting groove depth is insufficient on the side near the terminal post. Insufficient venting groove depth will affect the smoothness of venting. If the venting groove cannot effectively connect the space between the explosion-proof valve and the explosion-proof valve protection plate to the atmosphere, it may cause the pressure in the space between the explosion-proof valve and the explosion-proof valve protection plate to increase, causing the explosion-proof valve to fail to burst under the set threshold conditions, which poses a threat to the safety of the battery. Utility Model Content

[0004] This application discloses a top cover assembly, a battery, and an energy storage system, which can ensure the processing depth of the venting groove and the consistency of the stamping depth on both sides of the venting groove, thereby ensuring the smooth flow of venting and improving the safety and reliability of the battery.

[0005] To achieve the above objectives, embodiments of this application disclose a top cover assembly, comprising:

[0006] Explosion-proof valve;

[0007] A top cover plate, wherein the top cover plate is provided with an explosion-proof hole, the explosion-proof hole penetrates the top cover plate along the thickness direction, and the explosion-proof valve is installed in the explosion-proof hole;

[0008] The protrusion protrudes from the outer surface of the top cover plate and is located around the explosion-proof hole. An exhaust groove is provided on the surface of the protrusion away from the top cover plate. One end of the exhaust groove is connected to the explosion-proof hole, and the other end of the exhaust groove is connected to the atmosphere.

[0009] An explosion-proof valve protection plate is disposed in the explosion-proof hole, and the explosion-proof valve protection plate can cover the explosion-proof valve and cover the protrusion.

[0010] As an optional implementation, the venting groove is formed by a stamping process.

[0011] As an optional implementation, the explosion-proof valve protective plate includes a protective plate body and a mounting portion. The mounting portion surrounds the protective plate body, the protective plate body covers the explosion-proof hole, the mounting portion is attached to the outer surface of the top cover plate, and the mounting portion is provided with a recessed portion corresponding to the protrusion, the recessed portion being used to accommodate the protrusion.

[0012] As an optional implementation, a gap exists between the recess and the protrusion along the thickness direction of the top cover plate.

[0013] As an optional implementation, the top cover plate includes a mounting groove recessed on the outer surface of the top cover plate. The mounting groove is arranged around the circumference of the explosion-proof hole and communicates with the explosion-proof hole. The protrusion is disposed at the bottom of the mounting groove. The mounting groove is used to accommodate the mounting part. Along the thickness direction of the top cover plate, the depth of the mounting groove is less than the thickness of the protrusion, and the depth of the mounting groove is greater than or equal to the thickness of the mounting part.

[0014] As an optional implementation, the mounting groove is racetrack shaped, comprising two arc-shaped segments and two straight segments connecting the two arc-shaped segments, with the protrusion disposed on the straight segments.

[0015] As an optional implementation, the vent groove extends along a first horizontal direction, and the recessed portion is provided with a first inner wall on the side away from the edge of the explosion-proof valve protective plate along the first horizontal direction. Along the first horizontal direction, the distance from the first inner wall to the side wall of the explosion-proof hole is greater than the distance from the edge of the explosion-proof valve protective plate to the side wall of the mounting groove.

[0016] As an optional implementation, the distance from the edge of the explosion-proof valve protective plate to the side wall of the mounting groove is a, and the distance from the first inner wall to the side wall of the explosion-proof hole is b, where ba ≥ 0.2 mm.

[0017] As an optional implementation, an adhesive layer is provided between the mounting part and the outer surface of the top cover plate, the adhesive layer being used to fix the mounting part to the outer surface of the top cover plate, and no adhesive layer is provided between the recessed part and the protruding part.

[0018] As an optional implementation, the bottom surface of the exhaust groove and the outer surface of the top cover plate are in the same plane along the thickness direction of the top cover plate.

[0019] As an optional implementation, the protrusion is integrally formed with the top cover plate.

[0020] A second aspect of this application provides a battery, comprising:

[0021] A housing having an opening in the accommodating cavity;

[0022] The battery cell is housed in the accommodating cavity;

[0023] The top cover assembly is connected to the housing to seal the opening of the receiving cavity.

[0024] A third aspect of this application provides an energy storage system, including: the battery.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] The top cover assembly provided in this application embodiment has an exhaust groove protruding from the surface of the top cover plate, which avoids the problem of uneven material extrusion during exhaust groove processing caused by recessed exhaust grooves. This ensures the consistency of the depth of each position of the exhaust groove, avoids the problem of easy blockage of the exhaust groove caused by inconsistent exhaust groove depth, and avoids the problem of excessive pressure on one side of the explosion-proof valve due to poor exhaust, which leads to the explosion-proof valve being unable to properly release pressure. This improves the safety performance of the battery and extends the service life of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a first structure of the top cover assembly provided in an embodiment of this application;

[0029] Figure 2 A second structural schematic diagram of the top cover assembly provided in the embodiments of this application and a partially enlarged view of the exhaust channel;

[0030] Figure 3 A schematic diagram of a third structure of the top cover assembly provided in an embodiment of this application, and a partially enlarged view of the exhaust channel;

[0031] Figure 4 This is a schematic diagram of a fourth structure of the top cover assembly provided in an embodiment of this application;

[0032] Figure 5 for Figure 4A cross-sectional view along the AA direction and a partial enlarged view of the exhaust channel;

[0033] Figure 6 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0034] Figure 7 This is a schematic diagram of the energy storage system provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100-Top cover assembly; 1-Explosion-proof valve; 2-Top cover plate; 21-Explosion-proof hole; 22-Mounting groove; 3-Protrusion; 31-Exhaust groove; 4-Explosion-proof valve protection plate; 41-Protective plate body; 42-Recess; 102-Battery; 200-Energy storage system; 201-Energy storage device; 202-Electrical conversion device; 203-Electrical load. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In this application, the terms "upper," "lower," "top," "bottom," "inner," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0040] Furthermore, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0042] The battery mainly consists of a casing and a top cover assembly, which includes a top cover plate that covers the opening in the casing. The top cover plate is a crucial component of the lithium-ion battery. Located on top of the battery, it primarily protects the internal structure, seals the battery, and serves as a connection point between the battery and external circuitry. The design of the top cover plate directly impacts the battery's safety, reliability, and lifespan.

[0043] To ensure the battery can be safely depressurized when necessary, the top cover plate has a through-hole in the thickness direction, and an explosion-proof valve is embedded in the explosion-proof hole. Furthermore, an explosion-proof valve protection plate is used to protect the explosion-proof valve. In related technologies, to prevent the explosion-proof valve, the explosion-proof hole, and the explosion-proof valve protection plate from forming a closed space, venting grooves are usually designed around the explosion-proof hole to ensure that the explosion-proof hole remains open to the outside atmosphere.

[0044] However, in the existing venting groove stamping process, more material is extruded on one side of the venting groove than on the other. This uneven extrusion leads to inconsistent punch wear, resulting in insufficient venting groove stamping depth. In particular, the venting groove depth near the terminal post is often less than that on the other side. Insufficient venting groove depth directly affects venting smoothness. The heat generated during battery operation melts the adhesive layer on the explosion-proof valve protection plate. The melted adhesive layer blocks the venting groove on the side with insufficient depth. When the battery generates gas during operation, if the venting groove cannot effectively expel this gas, the pressure in the space between the explosion-proof valve and the explosion-proof valve protection plate will gradually increase. This pressure accumulation not only affects the normal operation of the battery but may also affect the pressure relief threshold of the explosion-proof valve, preventing the battery from exploding under the set threshold conditions and threatening battery safety.

[0045] Based on this, this application discloses a top cover assembly and a battery, in which an exhaust groove protrudes from the outer surface of the top cover plate, so that the overall exhaust path structure of the exhaust groove is consistent, preventing different degrees of wear on the punch and ensuring the consistency of the exhaust groove depth, thereby ensuring the smooth exhaust of the exhaust groove and avoiding safety hazards caused by exhaust groove blockage.

[0046] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0047] Please see Figures 1 to 3 , Figure 1 This is one of the structural schematic diagrams of the top cover assembly 100 provided in the embodiments of this application; Figure 2 This is a second structural schematic diagram of the top cover assembly 100 provided in the embodiments of this application; Figure 3 This is the third structural schematic diagram of the top cover assembly 100 provided in this application embodiment. This application embodiment discloses a top cover assembly 100, including: an explosion-proof valve 1; a top cover plate 2, on which an explosion-proof hole 21 is provided, the explosion-proof hole 21 penetrating the top cover plate 2 along its thickness direction, the explosion-proof valve 1 being installed in the explosion-proof hole 21; a protrusion 3, protruding from the outer surface of the top cover plate 2 and located on the outer periphery of the explosion-proof hole 21, an exhaust groove 31 being provided on the surface of the protrusion 3 away from the top cover plate 2, one end of the exhaust groove 31 communicating with the explosion-proof hole 21, and the other end of the exhaust groove 31 communicating with the atmosphere; and an explosion-proof valve protection plate 4, disposed in the explosion-proof hole 21, capable of covering the explosion-proof valve 1 and the protrusion 3.

[0048] Specifically, the top cover assembly 100 is applied to the battery 102, and the explosion-proof valve 1 included in the top cover assembly 100 can burst according to the internal gas pressure of the battery 102. When the internal pressure of the battery 102 rises abnormally, such as due to thermal runaway caused by overcharging, over-discharging, internal short circuit or other abnormal conditions, the explosion-proof valve 1 will automatically open to release the high-pressure gas accumulated inside the battery 102, thereby reducing the internal pressure of the battery 102 and preventing the battery 102 from rupturing or exploding due to excessive pressure.

[0049] The top cover plate 2, as the main part of the top cover assembly 100, provides structural support for the other structures of the top cover assembly 100. The top cover plate 2 ensures the stability and integrity of the other structures of the top cover assembly 100, allowing other components such as the explosion-proof valve 1 and the explosion-proof valve protection plate 4 to be firmly installed and fixed. The explosion-proof hole 21 on the top cover plate 2 cooperates with the explosion-proof valve 1, enabling the explosion-proof valve 1 to be fixed to the top cover plate 2, thereby preventing the electrolyte, gas, etc. inside the battery 102 from leaking into the external environment, and also preventing external moisture, dust, and other impurities from entering the battery 102, thus ensuring the normal operation and safety of the battery 102.

[0050] The protrusion 3 protrudes from the outer surface of the top cover plate 2 and is located on the outer periphery of the explosion-proof hole 21. The surface of the protrusion 3 away from the top cover plate 2 is provided with an exhaust groove 31. One end of the exhaust groove 31 is connected to the explosion-proof hole 21, and the other end of the exhaust groove 31 is connected to the atmosphere. At this time, the exhaust groove 31 provides a channel for gas discharge, ensuring that the gas between the explosion-proof valve protection plate 4 and the explosion-proof valve 1 can be quickly and safely discharged into the external environment, thereby ensuring that the air pressure in the space between the explosion-proof valve protection plate 4 and the explosion-proof valve 1 is balanced with the external air pressure.

[0051] The protrusion 3 protrudes from the outer surface of the top cover plate 2. The processing of the exhaust groove 31 is only related to the protrusion 3. That is, the structure that needs to be processed in the exhaust groove 31 is only the structure of the protrusion 3. This ensures that there is no difference in the structure along the entire exhaust channel path of the exhaust groove 31, avoiding the inconsistency in the depth of the exhaust groove 31 caused by the inconsistent processing depth on the inner and outer sides, which would affect the smoothness of the exhaust of the exhaust groove 31.

[0052] Furthermore, due to the consistency of the entire exhaust channel structure, when testing the exhaust flow of exhaust groove 31, only the depth of one point needs to be measured to determine the flow of the entire exhaust channel, simplifying the production testing process and improving production efficiency. By simplifying the testing process, the time and labor costs required for testing are reduced, thereby improving production efficiency.

[0053] In this way, the venting groove 31 ensures that the explosion-proof valve 1 can always be connected to the atmosphere through the venting groove 31, so that the pressure on one side of the explosion-proof valve 1 is always a constant atmospheric pressure, so as to avoid the explosion-proof valve 1 from fatigue failure due to sudden rise or fall of air pressure, and ensure that the explosion-proof valve 1 can perform the pressure relief function normally, thereby improving the safety of the battery 102.

[0054] An explosion-proof valve protection plate 4 is disposed in the explosion-proof hole 21. The explosion-proof valve protection plate 4 can cover the explosion-proof valve 1, thereby preventing the explosion-proof valve 1 from being damaged by external forces or accidental impacts during operation. Although the explosion-proof valve protection plate 4 covers the explosion-proof valve 1, it does not hinder the normal operation of the explosion-proof valve 1. At the same time, the explosion-proof valve protection plate 4, the explosion-proof hole 21, and the explosion-proof valve 1 can form a sealed space along the through direction of the explosion-proof hole 21. When the internal pressure of the battery 102 rises abnormally, one side of the explosion-proof valve 1 can be connected to the atmosphere through the exhaust groove 31, so that the internal pressure of the battery 102 can force open the explosion-proof valve 1, thereby opening the explosion-proof valve 1 and releasing the internal pressure of the battery 102.

[0055] Thus, the top cover assembly 100 provided in this application embodiment has the exhaust groove 31 protruding from the surface of the top cover plate 2, avoiding the problem of uneven material extrusion in the exhaust groove 31 when it is recessed, thereby ensuring the consistency of the depth of each position of the exhaust groove 31, avoiding the problem of easy blockage of the exhaust groove 31 caused by inconsistent depth, thereby avoiding the problem of excessive pressure on one side of the explosion-proof valve 1 due to poor exhaust, which leads to the explosion-proof valve 1 being unable to properly release pressure, improving the safety performance of the battery 102 and extending the service life of the battery 102.

[0056] In some embodiments, the venting groove 31 is formed by a stamping process. Specifically, in the stamping process, the venting groove 31 is formed by the interaction between the punch and die of a mold. First, a punch with a corresponding shape and size is manufactured according to the design requirements of the venting groove 31. Then, the top cover plate 2 with the protrusion 3 is placed on the worktable of a stamping machine. Next, the stamping machine is started, and the punch acts on the protrusion 3 with a certain pressure and speed. Through the stamping action of the mold, the protrusion 3 undergoes plastic deformation, thereby forming the shape of the venting groove 31.

[0057] Please see Figure 1 As an optional implementation, the explosion-proof valve protection plate 4 includes a protection plate body 41 and a mounting part. The mounting part surrounds the protection plate body 41, and the protection plate body 41 covers the explosion-proof hole 21. The mounting part is attached to the outer surface of the top cover plate 2. The mounting part is provided with a recessed part 42 corresponding to the protrusion 3. The recessed part 42 is used to accommodate the protrusion 3.

[0058] The protective plate body 41 is the core component of the explosion-proof valve protective plate 4. The protective plate body 41 directly covers the explosion-proof orifice 21 to shield the explosion-proof valve 1, thereby preventing damage from external forces or accidental impacts during operation. The shape and size of the protective plate body 41 can be customized according to the specific requirements of the explosion-proof orifice 21 to ensure that the protective plate body 41 can completely protect the explosion-proof valve 1, effectively preventing external substances from entering the explosion-proof orifice 21, while also withstanding a certain amount of internal pressure.

[0059] The mounting section is arranged around the protective plate body 41. The main function of the mounting section is to ensure that the protective plate body 41 can be stably installed on the top cover plate 2. The mounting section has a contact surface that fits against the outer surface of the top cover plate 2, as well as a connecting structure for fixing the protective plate, so that the mounting section can fix the protective plate body 41 on the top cover plate 2 and prevent the protective plate body 41 from moving or falling off during use, thus failing to achieve the protective function of the explosion-proof valve 1.

[0060] The mounting part is provided with a recessed part 42 corresponding to the protrusion 3. The recessed part 42 can cooperate with and accommodate the protrusion 3, thereby ensuring the cooperation between the mounting part and the protrusion 3, ensuring the ventilation of the exhaust groove 31, and preventing the explosion-proof valve protection plate 4, explosion-proof hole 21 and explosion-proof valve 1 from forming a closed space along the through direction of the explosion-proof hole 21, thus laying the foundation for the normal pressure relief of the explosion-proof valve 1.

[0061] In this way, the explosion-proof valve protective plate 4 effectively protects the explosion-proof hole 21, enhancing the safety of the battery 102. The protective plate body 41 covers the explosion-proof hole 21, preventing external substances from affecting the normal operation of the explosion-proof valve 1; the mounting part ensures that the protective plate body 41 is stably installed on the top cover plate 2; the recessed part 42 solves the installation problem caused by the protrusion 3 and provides additional protection for the protrusion 3 and the vent groove 31.

[0062] Please see Figure 2 In some embodiments, a gap exists between the recess 42 and the protrusion 3 along the thickness direction of the top cover plate 2.

[0063] The main function of the gap between the recess 42 and the protrusion 3 is to prevent the explosion-proof valve protective plate 4 from deforming under pressure, thereby blocking the exhaust groove 31. The exhaust groove 31 is the channel that allows gas to escape between the explosion-proof valve protective plate 4 and the explosion-proof valve 1. If the explosion-proof valve protective plate 4 deforms due to pressure changes and blocks the exhaust groove 31, the unobstructed flow of the exhaust groove 31 will be severely affected, and may even prevent gas from escaping, thereby increasing the internal pressure between the explosion-proof valve protective plate 4 and the explosion-proof valve 1 and causing safety hazards. Therefore, by designing the gap between the recess 42 and the protrusion 3, it can be ensured that even if the explosion-proof valve protective plate 4 is subjected to a certain pressure, it can maintain the stability of its shape and position and will not block the exhaust groove 31.

[0064] Meanwhile, the gap between the recess 42 and the protrusion 3 also helps to improve the installation flexibility and adaptability of the explosion-proof valve protection plate 4. Since the protrusion 3 may have certain dimensional changes due to factors such as manufacturing tolerances, material deformation, or errors during the installation process, the gap between the recess 42 and the protrusion 3 can accommodate these changes, making it easier to install the explosion-proof valve protection plate 4 on the top cover plate 2 and the protrusion 3, and ensuring the accuracy and stability of the installation of the explosion-proof valve protection plate 4.

[0065] Furthermore, the gap between the recess 42 and the protrusion 3 can reduce friction and wear between the explosion-proof valve protective plate 4 and the protrusion 3 to a certain extent. During long-term use, if the explosion-proof valve protective plate 4 and the protrusion 3 are in close contact without any gap, friction and wear between them will be unavoidable. The gap between the recess 42 and the protrusion 3 reduces the contact area and friction force between them, thereby extending the service life of both the explosion-proof valve protective plate 4 and the protrusion 3.

[0066] Please see Figure 3In some embodiments, the top cover plate 2 includes a mounting groove 22, which is recessed on the outer surface of the top cover plate 2. The mounting groove 22 is arranged around the explosion-proof hole 21 and communicates with the explosion-proof hole 21. A protrusion 3 is provided at the bottom of the mounting groove 22. The mounting groove 22 is used to accommodate the mounting part. Along the thickness direction of the top cover plate 2, the depth of the mounting groove 22 is less than the thickness of the protrusion 3, and the depth of the mounting groove 22 is greater than or equal to the thickness of the mounting part.

[0067] The mounting groove 22 is recessed on the outer surface of the top cover plate 2 and is arranged around the explosion-proof hole 21. The mounting groove 22 is connected to the explosion-proof hole 21, which ensures that the explosion-proof valve protection plate 4 can completely and accurately cover the explosion-proof hole 21, and also provides an ideal installation space for the installation part.

[0068] In this way, on the one hand, the explosion-proof valve protection plate 4 can have a larger bonding area with the outer surface of the top cover plate 2 without blocking the exhaust groove 31, thus preventing the explosion-proof valve protection plate 4 from falling off and failing to protect the explosion-proof valve 1. On the other hand, the connection of the explosion-proof valve protection plate 4 to the mounting groove 22 can also reduce the height of the explosion-proof valve protection plate 4 protruding from the outer surface of the top cover plate 2, thereby reducing the impact of the explosion-proof valve protection plate 4 on the overall thickness of the top cover plate 2.

[0069] Along the thickness direction of the top cover plate 2, the depth of the mounting groove 22 is less than the thickness of the protrusion 3, and the depth of the mounting groove 22 is greater than or equal to the thickness of the mounting part. This ensures that the protrusion 3 will not be completely pressed into the mounting groove 22 during installation, keeping the position of the exhaust groove 31 above the outer surface of the top cover plate 2, and also ensures that the mounting part can be stably embedded in the mounting groove 22 without shaking due to the mounting groove 22 being too shallow.

[0070] Please see Figure 3 In some embodiments, the mounting groove 22 is racetrack shaped, and the mounting groove 22 includes two arc-shaped segments and two straight segments connecting the two arc-shaped segments, with the protrusion 3 disposed on the straight segments.

[0071] Specifically, as described above, the mounting groove 22 is arranged around the outer periphery of the explosion-proof hole 21, while the venting groove 31 is located on the bottom surface of the mounting groove 22; that is, the explosion-proof hole 21 is also racetrack-shaped. When the venting groove 31 is located in the mounting groove 22, it is positioned at a location corresponding to the straight segment of the mounting groove 22. First, the straight segment provides a stable support surface for the protrusion 3, ensuring the stability and accuracy of the protrusion 3 during installation. Since the straight segment is easier to process and position than the curved segment, the manufacturing and installation process is simplified, improving production efficiency.

[0072] Furthermore, the design of the runway-shaped mounting groove 22 also takes into account stress distribution. When subjected to external forces, the arc-shaped segment can more effectively disperse stress and reduce the concentration of local stress, thereby improving the overall strength and durability of the top cover plate 2.

[0073] Please see Figures 4 to 5 , Figure 4 This is the fourth structural schematic diagram of the top cover assembly 100 provided in the embodiments of this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction. In some embodiments, the vent groove 31 extends along the first horizontal direction X, and the recess 42 is provided with a first inner wall on the side away from the edge of the explosion-proof valve protection plate 4 along the first horizontal direction X. Along the first horizontal direction X, the distance from the first inner wall to the side wall of the explosion-proof hole 21 is greater than the distance from the edge of the explosion-proof valve protection plate 4 to the side wall of the mounting groove 22.

[0074] Specifically, the distance from the first inner wall to the side wall of the explosion-proof hole 21 is greater than the distance from the edge of the explosion-proof valve protection plate 4 to the side wall of the mounting groove 22, taking into account possible deviations in the installation of the explosion-proof valve protection plate 4. Even if the explosion-proof valve protection plate 4 is slightly misaligned during installation, the venting groove 31 can still remain unobstructed due to the greater distance from the first inner wall to the side wall of the explosion-proof hole 21, avoiding the problem of poor venting caused by the misalignment of the explosion-proof valve protection plate 4.

[0075] In some embodiments, the distance from the edge of the explosion-proof valve protection plate 4 to the side wall of the mounting groove 22 is a, and the distance from the first inner wall to the side wall of the explosion-proof hole 21 is b, where ba ≥ 0.2 mm.

[0076] Furthermore, since ba≥0.2mm, even if the distance a between the edge of the explosion-proof valve protective plate 4 and the side wall of the mounting groove 22 is reduced due to the installation deviation, the distance b from the first inner wall to the side wall of the explosion-proof hole 21 is still large enough to accommodate and protect the exhaust groove 31 and prevent the exhaust groove 31 from being blocked.

[0077] Furthermore, the 0.2mm safety margin also takes into account manufacturing tolerances and wear during long-term use. During manufacturing, due to factors such as materials and processes, the actual dimensions may deviate somewhat from the design dimensions. By setting a safety margin, it can be ensured that the exhaust duct 31 can still function normally even with deviations. At the same time, wear during long-term use may also cause changes in the dimensions of the explosion-proof valve protective plate 4 and the mounting groove 22, and the 0.2mm margin provides a buffer against such wear.

[0078] Please see the return Figure 2In some embodiments, an adhesive layer is provided between the mounting part and the outer surface of the top cover plate 2. The adhesive layer is used to fix the mounting part to the outer surface of the top cover plate 2. No adhesive layer is provided between the recessed part 42 and the protruding part 3.

[0079] It is understandable that no adhesive layer is provided between the recessed portion 42 and the raised portion 3. If an adhesive layer were used between the recessed portion 42 and the raised portion 3, it might melt or flow into the venting groove 31 under high temperature or extreme conditions, causing blockage. If the venting groove 31 is blocked, it will seriously affect the normal operation and safety performance of the battery 102.

[0080] Therefore, by using an adhesive layer between the mounting part and the outer surface of the top cover plate 2, and avoiding its use between the recessed part 42 and the protruding part 3, the secure installation of the explosion-proof valve protection plate 4 is ensured, and the risk of the adhesive layer melting and clogging the exhaust groove 31 is prevented.

[0081] Please see Figure 2 In some embodiments, the bottom surface of the exhaust groove 31 and the outer surface of the top cover plate 2 are in the same plane along the thickness direction of the top cover plate 2.

[0082] First, by setting the bottom surface of the exhaust groove 31 and the outer surface of the top cover plate 2 in the same plane, it can be ensured that the opening of the exhaust groove 31 will not be blocked or restricted by other parts of the top cover plate 2, so that the gas can be discharged more smoothly from the explosion-proof valve 1 and the explosion-proof valve protection plate 4 through the exhaust groove 31, reducing the resistance and turbulence of the exhaust, thereby improving the exhaust efficiency.

[0083] Secondly, from a structural design perspective, keeping the bottom surface of the exhaust groove 31 on the same plane as the outer surface of the top cover plate 2 also helps to enhance the overall strength and stability of the top cover plate 2, which can reduce stress concentration and deformation caused by structural abrupt changes, thereby improving the durability and service life of the top cover plate 2.

[0084] Furthermore, placing the bottom surface of the exhaust duct 31 and the outer surface of the top cover plate 2 on the same plane facilitates subsequent maintenance and inspection. Since the bottom surface of the exhaust duct 31 and the outer surface of the top cover plate 2 are on the same plane, maintenance personnel can more easily observe and inspect the condition of the exhaust duct 31, and promptly identify and address any potential problems, such as blockages or wear.

[0085] In some embodiments, the protrusion 3 is integrally formed with the top cover plate 2. Integral forming of the protrusion 3 with the top cover plate 2 strengthens the overall structure, reduces potential points of failure, and improves production efficiency and reduces costs by simplifying the manufacturing process and assembly steps. Integral forming of the protrusion 3 with the top cover plate 2 also reduces maintenance needs due to loose or damaged connectors, extending the service life of the top cover assembly 100.

[0086] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a battery 102 provided in an embodiment of this application. A second aspect of this application provides a battery 102, including: a housing having an opening in a receiving cavity; a battery cell having a receiving cavity in which the battery cell is received; and a top cover assembly 100 connected to the housing to cover the opening of the receiving cavity.

[0087] Since the battery 102 provided in the second aspect of the present application includes the top cover assembly 100 provided in the first aspect of the present application, the battery 102 has the beneficial effects of any of the top cover assemblies 100 described above, which will not be repeated here.

[0088] A third aspect of this application provides an energy storage system 200, including a battery 102 provided in the second aspect of this application.

[0089] In this embodiment, as Figure 7 As shown, Figure 7 This is a schematic diagram of the structure of the energy storage system provided in the embodiments of this application. The energy storage device 201 of the energy storage system 200 includes the battery 102 described in the above embodiments. Therefore, the energy storage device 201 in this embodiment has the technical effects of the battery 102 in the above embodiments. Since the technical effects of the battery 102 and the top cover assembly 100 included in the battery 102 have been fully explained in the above embodiments, they will not be repeated here.

[0090] In addition, the energy storage system 200 may also include an energy conversion device 202 and an electrical load 203. The energy conversion device 202 is used to convert other forms of energy into electrical energy. The energy storage device 201 is able to store at least a portion of the electrical energy converted by the energy conversion device 202. The energy storage device 201 is also used to provide electrical energy to the electrical load 203, such as household appliances and street lights. When the power grid is interrupted or there is a power outage, the energy storage device 201 can supply power to the household appliances and street lights.

[0091] In addition, the power conversion device 202 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy. The power conversion device 202 can be a solar panel, windmill, geothermal power generation device, etc.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A top cover assembly, characterized in that, include: Explosion-proof valve; A top cover plate, wherein the top cover plate is provided with an explosion-proof hole, the explosion-proof hole penetrates the top cover plate along the thickness direction, and the explosion-proof valve is installed in the explosion-proof hole; The protrusion protrudes from the outer surface of the top cover plate and is located around the explosion-proof hole. An exhaust groove is provided on the surface of the protrusion away from the top cover plate. One end of the exhaust groove is connected to the explosion-proof hole, and the other end of the exhaust groove is connected to the atmosphere. An explosion-proof valve protection plate is disposed in the explosion-proof hole, and the explosion-proof valve protection plate can cover the explosion-proof valve and cover the protrusion.

2. The top cover assembly according to claim 1, characterized in that, The exhaust groove is formed by a stamping process.

3. The top cover assembly according to claim 1, characterized in that, The explosion-proof valve protective plate includes a protective plate body and a mounting part. The mounting part surrounds the protective plate body, and the protective plate body covers the explosion-proof hole. The mounting part is attached to the outer surface of the top cover plate. The mounting part has a recessed part corresponding to the protrusion, and the recessed part is used to accommodate the protrusion.

4. The top cover assembly according to claim 3, characterized in that, Along the thickness direction of the top cover plate, there is a gap between the recess and the protrusion.

5. The top cover assembly according to claim 3, characterized in that, The top cover plate includes a mounting groove recessed on the outer surface of the top cover plate. The mounting groove is arranged around the circumference of the explosion-proof hole and communicates with the explosion-proof hole. The protrusion is disposed at the bottom of the mounting groove. The mounting groove is used to accommodate the mounting part. Along the thickness direction of the top cover plate, the depth of the mounting groove is less than the thickness of the protrusion, and the depth of the mounting groove is greater than or equal to the thickness of the mounting part.

6. The top cover assembly according to claim 5, characterized in that, The mounting groove is racetrack shaped, comprising two arc-shaped segments and two straight segments connecting the two arc-shaped segments, with the protrusion disposed on the straight segments.

7. The top cover assembly according to claim 5, characterized in that, The exhaust groove extends along a first horizontal direction, and the recessed portion is provided with a first inner wall on the side away from the edge of the explosion-proof valve protective plate along the first horizontal direction. Along the first horizontal direction, the distance from the first inner wall to the side wall of the explosion-proof hole is greater than the distance from the edge of the explosion-proof valve protective plate to the side wall of the mounting groove.

8. The top cover assembly according to claim 7, characterized in that, The distance from the edge of the explosion-proof valve protective plate to the side wall of the mounting groove is a, and the distance from the first inner wall to the side wall of the explosion-proof hole is b, where ba ≥ 0.2 mm.

9. The top cover assembly according to claim 3, characterized in that, An adhesive layer is provided between the mounting part and the outer surface of the top cover plate, and the adhesive layer is used to fix the mounting part to the outer surface of the top cover plate.

10. The top cover assembly according to any one of claims 1-9, characterized in that, Along the thickness direction of the top cover plate, the bottom surface of the exhaust groove and the outer surface of the top cover plate are in the same plane.

11. The top cover assembly according to any one of claims 1-9, characterized in that, The protrusion is integrally formed with the top cover plate.

12. A battery, characterized in that, include: A housing having an opening in the accommodating cavity; The battery cell is housed in the accommodating cavity; The top cover assembly as claimed in any one of claims 1-11, wherein the top cover assembly is connected to the housing to cover the opening of the receiving cavity.

13. An energy storage system, characterized in that, include: The battery as claimed in claim 12.

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