Top cover structure and battery cell

Abstract

The utility model discloses a top cover structure and a battery cell, and belongs to the technical field of battery cells. The top cover structure comprises a top cover and a pressure release valve, the top cover is mounted at the opening of the battery cell shell; the pressure release valve comprises a valve body, a valve core and a sealing assembly, the valve body is connected with the top cover, the sealing assembly is hermetically inserted into the top end of the valve body, the valve body is provided with an inner cavity, a first exhaust hole capable of being communicated with the outside of the valve body and a second exhaust hole communicated with the inside of the battery cell shell, and one end of the valve core is arranged in the inner cavity and seals the second exhaust hole; the other end of the valve element extends out of the valve body and is connected with the sealing assembly, the valve element can move upwards in the Z-axis direction relative to the valve body so as to open the second exhaust hole, and the valve element can push the sealing assembly upwards in the Z-axis direction so that the sealing assembly can be separated from the valve body so as to open the first exhaust hole. The top cover structure can be used for performing balanced pressure relief on the internal air pressure of the battery cell shell in the normal process of the battery cell, so that the relatively good working performance of the battery cell is ensured, and the cycle service life of the whole battery cell is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric core, especially top cover structure and electric core. BACKGROUND

[0002] At present, the explosion-proof valve is applied to the electric core of the electric vehicle, when the electric core abnormally works and the thermal runaway phenomenon appears, at this time, the large amount of gas generated by the thermal runaway in the electric core can be quickly exhausted and pressure released through the explosion-proof valve, so as to avoid causing the safety accident and ensure the safety of the electric core in the thermal runaway.

[0003] However, in the normal operation and braking process of the electric vehicle, that is, when the electric core normally works, the electric core will heat and generate a small amount of gas, so that the air pressure in the electric core increases in the normal range, that is, the gas generated at this time will not break through the explosion-proof valve to exhaust and pressure release, although the small amount of gas generated will not cause a large safety accident, but will cause the electric core to work in the environment with a certain air pressure for a long time, which is easy to affect the working performance of the electric core and reduce the cycle service life of the whole electric core.

[0004] In view of the above problems, a top cover structure and an electric core are needed to solve the above problems. INVENTION CONTENTS

[0005] The utility model discloses a kind of top cover structure and electric core, can balance pressure release to the internal air pressure of electric core shell in the normal process of electric core, to ensure that the working performance of electric core is good and improve the cycle service life of whole electric core.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] Top cover structure, comprising:

[0008] Top cover, is installed in the opening of electric core shell;

[0009] Pressure relief valve, including valve body, valve core and sealing assembly, the valve body is connected with the top cover, the sealing assembly is sealed and is inserted in the top of the valve body, the valve body is equipped with inner cavity, first exhaust hole that can be communicated with the outside of the valve body and second exhaust hole that is communicated with the inside of the electric core shell, one end of the valve core is located in the inner cavity and seals the second exhaust hole, the other end of the valve core extends out of the valve body and is connected with the sealing assembly, the valve core can be moved upwards along Z axis relative to the valve body to open the second exhaust hole, and the valve core can push the sealing assembly upwards along Z axis, so that the sealing assembly is separated from the valve body to open the first exhaust hole.

[0010] As an optional scheme, the top cover structure further comprises:

[0011] An explosion-proof valve is provided on the top cover and spaced apart from the pressure relief valve on one side, wherein the first pressure relief threshold of the pressure relief valve is less than the second pressure relief threshold of the explosion-proof valve.

[0012] As an optional solution, the valve body includes:

[0013] The valve body is located in the stepped through hole of the top cover, and a part of the valve body extends into the interior of the battery cell housing. The valve body has the inner cavity, and the bottom end of the valve body has the second vent hole.

[0014] The first boss is arranged around the outer peripheral surface of the valve body, and the first boss is connected to the stepped surface of the stepped through hole;

[0015] The second protrusion is arranged in a ring on the top surface of the valve body. The second protrusion is sealed and inserted into the sealing assembly, and the first exhaust hole is provided inside the second protrusion and at the top of the valve body.

[0016] As an optional solution, the first boss is laser welded to the stepped surface of the stepped through hole.

[0017] As an optional solution, the valve body, the first boss, and the second boss are integrally formed.

[0018] As an optional solution, the valve core includes:

[0019] A valve stem is slidably disposed in the inner cavity along the Z-axis, with one end of the valve stem located at a distance within the second exhaust hole and the other end connected to the sealing assembly;

[0020] A limiting stop is arranged around the outer circumference of the valve stem. The limiting stop is located near the bottom end of the valve stem and can abut against the inner bottom wall or the inner top wall of the inner cavity.

[0021] As an optional solution, the inner cavity is also provided with an elastic element, one end of which abuts against the inner top wall of the inner cavity, and the other end abuts against the top surface of the limiting stop.

[0022] As an optional solution, the sealing assembly includes:

[0023] The gland is located above the valve body;

[0024] A sealing element is connected inside the gland, and the other end of the valve stem passes through the sealing element and is connected inside the gland; the valve body is sealed and inserted into the sealing element.

[0025] Alternatively, the valve stem is threadedly connected to the gland.

[0026] The battery cell includes a battery cell housing, a core package, and a top cover structure as described above. The top cover is connected to the battery cell housing to form a receiving cavity. The core package is disposed in the receiving cavity, and the second vent is connected to the receiving cavity.

[0027] The beneficial effects of this utility model are as follows:

[0028] By configuring a pressure relief valve comprising a valve body, a valve core, and a sealing assembly, the valve body is connected to the top cover, the sealing assembly is sealed and inserted into the top of the valve body, and one end of the valve core is located within the inner cavity of the valve body, sealing the second vent hole of the valve body. The other end of the valve core extends out of the valve body and is connected to the sealing assembly. When the battery cell needs to be depressurized during normal operation, the valve core moves upward relative to the valve body along the Z-axis to open the second vent hole. Simultaneously, the valve core pushes the sealing assembly upward along the Z-axis, causing the sealing assembly to disengage from the valve body and open the first vent hole. This allows pressure relief to be achieved within the battery cell housing, through the second vent hole, and within the inner cavity. The interconnection between the cavity, the first vent hole, and the outside of the valve body allows a small amount of gas generated inside the battery cell housing to be discharged to the outside of the valve body sequentially through the second vent hole, the inner cavity, and the first vent hole. This achieves pressure relief and exhaust of the battery cell, ensuring that the air pressure inside the battery cell housing is suitable. This allows the battery cell to operate normally under a suitable air pressure environment, thereby ensuring good working performance of the battery cell and improving the overall cycle life of the battery cell. Furthermore, the aforementioned pressure relief valve includes a valve body, a valve core, and a sealing assembly, making the entire pressure relief valve simple in structure and low in cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the top cover structure provided in this utility model;

[0030] Figure 2 This is an exploded and enlarged structural diagram of the pressure relief valve provided in this utility model;

[0031] Figure 3 This is a cross-sectional enlarged schematic diagram of the pressure relief valve (with a top cover) provided in this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10-Top cover structure;

[0034] 1-Top cover; 11-Stepped through hole; 111-Stepped surface; 12-Mounting through hole;

[0035] 2-Pressure relief valve; 21-Valve body; 211-Inner cavity; 212-First vent; 213-Second vent; 214-Valve body; 215-First boss; 216-Second boss; 22-Valve core; 221-Valve stem; 222-Limit stop; 23-Sealing assembly; 231-Gland; 2311-Threaded blind hole; 232-Seal; 24-Elastic element;

[0036] 3-Explosion-proof valve; 4-Receiving cavity. Detailed Implementation

[0037] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0038] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0039] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1 to 3 As shown, this embodiment proposes a top cover structure 10 and a battery cell including the top cover structure 10. The battery cell also includes a battery cell housing and a core package. The top cover structure 10 is installed at the opening of the battery cell housing, so that the top cover structure 10 and the battery cell housing are connected to form a receiving cavity 4, and the core package is disposed in the receiving cavity 4. The top cover structure 10 can ensure that the core package can work normally in a relatively suitable air pressure environment, so as to ensure good working performance of the entire battery cell and improve the cycle life of the entire battery cell, and can also ensure the safety of the core package in the event of thermal runaway. Multiple core packages can be disposed in the receiving cavity 4; the specific number of core packages is not limited here.

[0041] Specifically, such as Figures 1 to 3 As shown, the top cover structure 10 includes a top cover 1 and a pressure relief valve 2; wherein, the top cover 1 is installed at the opening of the battery cell housing so that the top cover 1 and the battery cell housing are connected to form the aforementioned receiving cavity 4; the pressure relief valve 2 includes a valve body 21, a valve core 22 and a sealing assembly 23, the valve body 21 is connected to the top cover 1, the sealing assembly 23 is sealed and inserted into the top of the valve body 21, the valve body 21 has an inner cavity 211, a first vent 212 that can communicate with the outside of the valve body 21 and a second vent 213 that communicates with the inside of the battery cell housing, one end of the valve core 22 is located in the inner cavity 211 and seals the second vent 213, the other end of the valve core 22 extends out of the valve body 21 and is connected to the sealing assembly 23, the valve core 22 can move upward along the Z-axis relative to the valve body 21 to open the second vent 213, and the valve core 22 can push the sealing assembly 23 upward along the Z-axis to disengage the sealing assembly 23 from the valve body 21 to open the first vent 212. The second exhaust port 213 is connected to the receiving cavity 4.

[0042] Compared with the prior art, the top cover structure 10 in this embodiment adds a pressure relief valve 2. By connecting the valve body 21 to the top cover 1, the sealing assembly 23 is sealed and inserted into the top of the valve body 21. One end of the valve core 22 is located in the inner cavity 211 of the valve body 21, sealing the second vent hole 213 of the valve body 21. The other end of the valve core 22 extends out of the valve body 21 and is connected to the sealing assembly 23. When the battery cell needs to release pressure during normal operation, the valve core 22 moves upward along the Z-axis relative to the valve body 21 to open the second vent hole 213. Simultaneously, the valve core 22 pushes the sealing assembly 23 upward along the Z-axis, causing the sealing assembly 23 to disengage from the valve body 21 and open the first vent hole 212, thereby achieving… The interconnection between the interior of the battery cell housing, the second vent 213, the inner cavity 211, the first vent 212, and the exterior of the valve body 21 allows a small amount of gas generated inside the battery cell housing to be discharged sequentially through the second vent 213, the inner cavity 211, and the first vent 212 to the exterior of the valve body 21, thereby achieving pressure relief and venting of the battery cell. This ensures that the air pressure inside the battery cell housing is suitable, allowing the battery cell to operate normally under a suitable air pressure environment, thus ensuring good working performance of the battery cell and improving the overall cycle life of the battery cell. Furthermore, the aforementioned pressure relief valve 2 includes a valve body 21, a valve core 22, and a sealing assembly 23, making the entire pressure relief valve 2 simple in structure and low in cost.

[0043] It is worth noting that, since the pressure relief valve 2 can release the pressure and exhaust air in the receiving cavity 4, it ensures that the air pressure in the receiving cavity 4 is relatively suitable, so that the core pack can work normally in a relatively suitable air pressure environment. In other words, the pressure relief valve 2 can ensure that the pressure in the receiving cavity 4 is not too high, thereby avoiding safety accidents caused by excessive pressure and ensuring the safety of the battery cell.

[0044] Furthermore, such as Figure 1 As shown, the top cover structure 10 also includes an explosion-proof valve 3. The explosion-proof valve 3 is located on the top cover 1 and spaced apart from the pressure relief valve 2 on one side. The first pressure relief threshold of the pressure relief valve 2 is less than the second pressure relief threshold of the explosion-proof valve 3. The explosion-proof valve 3 can adopt a structure commonly found in existing battery cells. Specifically, the first pressure relief threshold is 0.2 MPa to 0.4 MPa, and the second pressure relief threshold is 0.6 MPa to 0.8 MPa.

[0045] Specifically, when the core pack generates gas during normal operation, causing the gas pressure in the containment cavity 4 to reach the first pressure relief threshold, the movement of the valve core 22 opens the first exhaust port 212 and the second exhaust port 213, allowing the gas in the containment cavity 4 to be discharged to the outside of the valve body 21 in sequence through the second exhaust port 213, the inner cavity 211, and the first exhaust port 212, thereby achieving pressure relief and exhaust of the battery cell, ensuring the normal operation performance and cycle life of the battery cell; when the gas pressure in the containment cavity 4 reaches the second pressure relief threshold, the gas pressure in the containment cavity 4 is too high and thermal runaway occurs, causing the gas in the containment cavity 4 to open the explosion-proof valve 3, so that the gas can be quickly discharged and depressurized through the explosion-proof valve 3, ensuring the safety of the battery cell in the event of thermal runaway; that is, the top cover structure 10 in this embodiment uses two valves, the pressure relief valve 2 and the explosion-proof valve 3, which work together to timely relieve the gas pressure generated by the core pack exhaust, thereby better ensuring the safety of the entire battery cell.

[0046] Furthermore, such as Figure 2 and Figure 3 As shown, the valve body 21 includes a valve body 214, a first boss 215, and a second boss 216. The valve body 214 is disposed in the stepped through hole 11 of the top cover 1, and a portion of the valve body 214 extends into the interior of the battery cell housing, that is, a portion of the valve body 214 is located in the receiving cavity 4. The valve body 214 has the aforementioned inner cavity 211, and the valve body 214 has the aforementioned second vent hole 213 at its bottom end. The first boss 215 is arranged around the outer circumferential surface of the valve body 214 and is connected to the stepped surface 111 of the stepped through hole 11 to realize the connection between the pressure relief valve 2 and the top cover 1. The second boss 216 is arranged in a ring on the top surface of the valve body 214. The second boss 216 is sealed and inserted into the sealing assembly 23, and the second boss 216 and the top of the valve body 214 have the aforementioned first vent hole 212.

[0047] Specifically, such as Figure 3 As shown, the first boss 215 is laser welded to the stepped surface 111 of the stepped through hole 11 to ensure the stability and reliability of the connection between the first boss 215 and the stepped surface 111, thereby ensuring the stable connection between the valve body 21 and the top cover 1.

[0048] Furthermore, such as Figure 2 and Figure 3 As shown, the valve body 214, the first boss 215, and the second boss 216 are integrally formed, which simplifies the assembly of the entire valve body 21 and ensures good connection stability. In other embodiments, the valve body 214, the first boss 215, and the second boss 216 can also be separate connection structures, which are not specifically limited here.

[0049] Specifically, the valve body 214, the first boss 215, and the second boss 216 are made of aluminum. Aluminum has the characteristics of good formability, high strength, corrosion resistance, and long service life, which can ensure that the overall valve body 21 has excellent performance.

[0050] Furthermore, such as Figure 2 and Figure 3 As shown, the valve core 22 includes a valve stem 221 and a limiting stop 222. The valve stem 221 is slidably disposed within the inner cavity 211 along the Z-axis. One end of the valve stem 221 is spaced within the second vent hole 213, and the other end extends upward along the Z-axis to the second boss 216 and connects to the sealing assembly 23, thus connecting the valve core 22 and the sealing assembly 23. The limiting stop 222 is circumferentially disposed on the outer periphery of the valve stem 221, and is positioned near the bottom end of the valve stem 221. The limiting stop 222 can abut against the inner bottom wall or the inner top wall of the inner cavity 211 to prevent the valve stem 221 from sliding out of the inner cavity 211. In this embodiment, the limiting stop 222 can specifically be an anti-disengagement block.

[0051] It is worth noting that, such as Figure 3 As shown, the aforementioned valve stem 221 being spaced within the second vent hole 213 specifically means that there is an inflation gap between one end of the valve stem 221 and the second vent hole 213, allowing the gas in the receiving cavity 4 to pass through this inflation gap and push against the bottom end face of the limiting stop 222, thereby driving the entire valve core 22 to move upward along the Z-axis; furthermore, the bottom end face of the valve stem 221 is flush with the bottom end face of the valve body 214, so as to ensure the aesthetic appearance of the entire pressure relief valve 2 while avoiding interference between the valve stem 221 and the core package in the receiving cavity 4.

[0052] Furthermore, such as Figure 2 and Figure 3 As shown, an elastic element 24 is also provided in the inner cavity 211. One end of the elastic element 24 abuts against the inner top wall of the inner cavity 211, and the other end of the elastic element 24 abuts against the top surface of the limiting stop 222, so as to limit the relative ends of the elastic element 24.

[0053] In this embodiment, as Figure 2 and Figure 3As shown, the elastic element 24 can specifically be a spring. In its natural state, the spring's length can be 6mm to 10mm, preferably 8mm. Before pressure relief is achieved through the pressure relief valve 2, the spring is in a compressed state. At this time, the spring's compression is 3mm to 5mm, preferably 4mm, and the spring's thickness is 0.1mm to 1mm, preferably 0.2mm. That is, the spring is initially in a compressed state, reducing its length from 8mm to 4mm. At this time, the battery cell is in a sealed state, and the first vent 212 and the second vent 213 are not open. When the gas inside the battery cell needs to be released... When valve 2 is released, the air pressure in the receiving chamber 4 reaches about 0.2 MPa. The gas in the receiving chamber 4 pushes the valve rod 221, the limit stop 222, the seal 232, and the pressure cap 231 upward along the Z-axis, causing the spring to be compressed a second time to a length of less than 4 mm. The first exhaust port 212 and the second exhaust port 213 are both opened to discharge the gas in the receiving chamber 4 through the first exhaust port 212 and the second exhaust port 213. When the gas in the receiving chamber 4 is discharged to a pressure of less than 0.2 MPa, the spring springs back to the first compression state with a length of 4 mm. This cycle is repeated, thereby increasing the cycle life and continuous safety of the battery cell.

[0054] Specifically, when the air pressure in the receiving cavity 4 reaches the first pressure relief threshold, the gas in the receiving cavity 4 pushes against the bottom surface of the limiting stop 222 through the aforementioned inflation interval, thereby pushing the limiting stop 222 and the valve stem 221 as a whole to move upward along the Z-axis, thereby opening the first exhaust port 212 and the second exhaust port 213 to release air pressure. At this time, the elastic element 24 is compressed. When the air pressure in the receiving cavity 4 is reduced to below the first pressure relief threshold, the limiting stop 222 can move downward along the Z-axis under the elastic force of the elastic element 24 to reseal the first exhaust port 212 and the second exhaust port 213, thereby ensuring the sealing effect of the core package in the receiving cavity 4, so that the core package can continue to work normally.

[0055] That is, in this embodiment, the pressure relief valve 2 will automatically reset when the pressure in the receiving cavity 4 is below the first pressure relief threshold, ensuring that the entire battery cell can continue to work normally. However, when the pressure in the receiving cavity 4 reaches the first pressure relief threshold, the explosion-proof valve 3 in this embodiment will open to quickly relieve pressure and exhaust gas. Since the explosion-proof valve 3 has been damaged at this time, it cannot automatically reset. That is, when the explosion-proof valve 3 is opened, it cannot be guaranteed that the entire battery cell can continue to work normally.

[0056] Furthermore, such as Figure 2 and Figure 3As shown, the sealing assembly 23 includes a gland 231 and a seal 232; wherein, the gland 231 is located above the valve body 214; the seal 232 is connected inside the gland 231, and the other end of the valve stem 221 passes through the seal 232 and is connected inside the gland 231, and the second boss 216 of the valve body 21 is sealed and inserted into the seal 232.

[0057] Specifically, such as Figure 3 As shown, a groove is provided inside the gland 231, and the seal 232 is snapped into the groove to achieve the connection between the gland 231 and the seal 232. The connection method is simple and convenient, and easy to disassemble and replace. Furthermore, the bottom end face of the seal 232 is flush with the bottom end face of the gland 231, so as to ensure the aesthetic appearance of the entire sealing assembly 23 while avoiding interference between the gland 231 and the valve body 214. In this embodiment, the seal 232 can be a rubber part. The specific structure of the seal 232 is not limited here, as long as it can achieve the sealing effect between the seal 232 and the second boss 216.

[0058] Furthermore, such as Figure 2 and Figure 3 As shown, the valve stem 221 is threadedly connected to the gland 231. That is, a threaded blind hole 2311 is provided in the gland 231, and an external thread is provided on the outer circumferential surface of the valve stem 221. The external thread can be threaded into the threaded blind hole 2311, thereby realizing the threaded connection between the valve stem 221 and the gland 231. The threaded connection method is relatively simple and convenient, making it easy to loosen and adjust the connection degree, and ensuring a good tightness between the valve stem 221 and the gland 231.

[0059] Specifically, such as Figure 1 As shown, two mounting through holes 12 are also provided on the top cover 1. The two mounting through holes 12 are located at opposite ends of the top cover 1. The two mounting through holes 12 are used to install the positive terminal and the negative terminal, respectively, and the positive terminal and the negative terminal are connected to the core package. The positive terminal, negative terminal and core package in this embodiment are all common structures in existing battery cells, and their working principles will not be described in detail here.

[0060] The specific venting process of the battery cell in this embodiment is as follows:

[0061] First, when the core package generates gas during normal operation, the gas pressure in the receiving cavity 4 gradually increases and applies an upward thrust along the Z-axis to the limiting stop 222 through the second exhaust port 213, causing the valve stem 221 to be subjected to an upward thrust along the Z-axis. Then, when the gas pressure in the receiving cavity 4 increases to the first pressure relief threshold, the thrust of the gas in the receiving cavity 4 acting on the limiting stop 222 can overcome the elastic resistance of the elastic element 24 and push the valve stem 221 to move upward along the Z-axis, so that the limiting stop 222 and the valve stem 221 drive the sealing element 232 and the pressure cap 231 to move upward along the Z-axis as a whole, so that the sealing element 232 and the second boss 216 disengage from each other. At this time, the first exhaust port 212 and the second exhaust port 213 open, so that the gas in the receiving cavity 4 is discharged to the outside of the valve body 21 through the second exhaust port 213, the inner cavity 211, and the first exhaust port 212 in sequence, thereby realizing the exhaust and pressure relief of the gas in the receiving cavity 4. At this time, the elastic element 24 is compressed.

[0062] Then, when the air pressure in the receiving cavity 4 falls below the first pressure relief threshold, the thrust of the gas in the receiving cavity 4 acting on the limiting stop 222 cannot overcome the elastic resistance of the elastic element 24 to continue pushing the valve stem 221 upward along the Z-axis. This causes the limiting stop 222 and the valve stem 221 to automatically reset downward along the Z-axis under the elastic force of the elastic element 24, thereby resealing the first exhaust port 212 and the second exhaust port 213, achieving resealing of the battery cell. Figure 3 As shown, this ensures the normal operation of the battery cell.

[0063] When the core pack experiences thermal runaway due to abnormal operation, a large amount of high-temperature and high-pressure gas will be generated in the containment cavity 4. This high-temperature and high-pressure gas will directly open the explosion-proof valve 3, so as to quickly exhaust and depressurize through the explosion-proof valve 3, ensuring the safety of the battery cell during thermal runaway.

[0064] In this embodiment, the battery cell is equipped with a pressure relief valve 2 and an explosion-proof valve 3 on the top cover 1. The pressure relief valve 2 releases pressure and then reseals, ensuring that the battery cell can operate normally in a suitable atmospheric pressure environment. This ensures good performance of the entire battery cell and improves its cycle life. Furthermore, in the event of thermal runaway, the explosion-proof valve 3 provides rapid pressure relief, ensuring safety during thermal runaway and reducing the risk of explosion.

[0065] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover structure, characterized in that, include: Top cover (1), installed in the opening of the cell housing; A pressure relief valve (2) includes a valve body (21), a valve core (22), and a sealing assembly (23). The valve body (21) is connected to the top cover (1), and the sealing assembly (23) is sealed and inserted into the top of the valve body (21). The valve body (21) has an inner cavity (211), a first vent (212) that communicates with the outside of the valve body (21), and a second vent (213) that communicates with the inside of the battery cell housing. One end of the valve core (22) is located in the inner cavity (211). 11) and seal the second exhaust port (213), the other end of the valve core (22) extends out of the valve body (21) and is connected to the sealing assembly (23), the valve core (22) can move upward along the Z-axis relative to the valve body (21) to open the second exhaust port (213), and the valve core (22) can push the sealing assembly (23) upward along the Z-axis to disengage the sealing assembly (23) from the valve body (21) to open the first exhaust port (212).

2. The top cover structure as described in claim 1, characterized in that, The top cover structure also includes: An explosion-proof valve (3) is provided on the top cover (1) and spaced apart from the pressure relief valve (2) on one side. The first pressure relief threshold of the pressure relief valve (2) is less than the second pressure relief threshold of the explosion-proof valve (3).

3. The top cover structure as described in claim 1, characterized in that, The valve body (21) includes: The valve body (214) is located in the stepped through hole (11) of the top cover (1). A part of the valve body (214) extends into the interior of the battery cell housing. The valve body (214) has the inner cavity (211) inside. The bottom end of the valve body (214) has the second exhaust hole (213). The first boss (215) is arranged around the outer peripheral surface of the valve body (214), and the first boss (215) is connected to the step surface (111) of the step through hole (11); The second boss (216) is arranged in a ring on the top surface of the valve body (214). The second boss (216) is sealed and inserted into the sealing assembly (23). The first exhaust hole (212) is provided in the second boss (216) and the top of the valve body (214).

4. The top cover structure as described in claim 3, characterized in that, The first boss (215) is laser welded to the step surface (111) of the stepped through hole (11).

5. The top cover structure as described in claim 3, characterized in that, The valve body (214), the first boss (215), and the second boss (216) are integrally formed.

6. The top cover structure as described in any one of claims 1-5, characterized in that, The valve core (22) includes: The valve stem (221) is slidably disposed in the inner cavity (211) along the Z-axis. One end of the valve stem (221) is located in the second exhaust hole (213) at a distance, and the other end is connected to the sealing assembly (23). A limiting stop (222) is arranged around the outer periphery of the valve stem (221). The limiting stop (222) is located near the bottom end of the valve stem (221). The limiting stop (222) can abut against the inner bottom wall or the inner top wall of the inner cavity (211).

7. The top cover structure as described in claim 6, characterized in that, The inner cavity (211) is also provided with an elastic element (24), one end of which abuts against the inner top wall of the inner cavity (211), and the other end abuts against the top surface of the limiting stop (222).

8. The top cover structure as described in claim 6, characterized in that, The sealing assembly (23) includes: A pressure cap (231) is located above the valve body (21); A seal (232) is connected inside the gland (231), and the other end of the valve stem (221) passes through the seal (232) and is connected inside the gland (231). The valve body (21) is sealed and inserted into the seal (232).

9. The top cover structure as described in claim 8, characterized in that, The valve stem (221) is threadedly connected to the gland (231).

10. A battery cell, characterized in that, The battery includes a battery cell housing, a core package, and a top cover structure as described in any one of claims 1-9, wherein the top cover (1) is connected to the battery cell housing to form a receiving cavity (4), the core package is disposed in the receiving cavity (4), and the second vent (213) communicates with the receiving cavity (4).

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