Battery cell top cover, battery cell, battery and vehicle

Abstract

The embodiment of the invention provides a battery cell top cover, a battery cell, a battery and a vehicle, and the battery cell top cover comprises a cover plate assembly; the explosion-proof valve assembly is welded to the cover plate assembly, the explosion-proof valve assembly is arranged close to the bottom of the cover plate assembly, the explosion-proof valve assembly comprises a strain detection piece, and the strain detection piece is used for detecting pressure information in the battery cell through a strain-internal pressure corresponding conversion relation. The technical effect of converting the internal pressure information of the battery cell into the measurable strain signal is realized, and the technical problem that the thermal runaway sign is difficult to effectively identify at the initial stage of thermal runaway is solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cell top cover, a cell, a battery, and a vehicle. Background Technology

[0002] Currently, battery systems commonly employ voltage and temperature-based monitoring methods to prevent thermal runaway. While these methods can reflect battery status to some extent, the accuracy and timeliness of early warnings are limited by temperature gradients and voltage plateau effects within different regions of the cell. Furthermore, although long-term neural network algorithm training and large-scale data accumulation can improve recognition accuracy, these methods are too complex and time-consuming for most battery applications, making it difficult to meet the needs of real-time early warning. Especially at different stages of the battery lifecycle, the rate of internal pressure change varies significantly, making it difficult to capture early signs of thermal runaway solely through external parameter monitoring.

[0003] Currently, there is a lack of technical means to effectively identify signs of thermal runaway in its early stages. No effective solution has yet been proposed to address this problem. Summary of the Invention

[0004] This application provides a cell top cover, a cell, a battery, and a vehicle to at least solve the technical problem in the prior art that it is difficult to effectively identify signs of thermal runaway in the early stages of thermal runaway.

[0005] According to one aspect of the present application, a battery cell top cover is provided, including: a cover plate assembly; an explosion-proof valve assembly, the explosion-proof valve assembly being welded to the cover plate assembly, the explosion-proof valve assembly being disposed near the bottom of the cover plate assembly, and the explosion-proof valve assembly including a strain detection element for detecting pressure information inside the battery cell.

[0006] Furthermore, the explosion-proof valve assembly includes: an explosion-proof valve ring, which is welded to the cover plate assembly; an explosion-proof valve cover, which is connected to the cover plate assembly via the explosion-proof valve ring, the explosion-proof valve ring being arranged circumferentially along the explosion-proof valve cover, the explosion-proof valve cover having a mounting groove, and a strain gauge being located within the mounting groove; and a signal output device, which is located within the mounting groove, connected to the strain gauge, and used to transmit electrical signals.

[0007] Furthermore, the cover assembly includes: a cover plate having a mounting hole, an explosion-proof valve cover located within the mounting hole, the explosion-proof valve cover being connected to the cover plate via an explosion-proof valve ring; a protective member connected to the top surface of the cover plate, the protective member having an installation position for blocking the mounting hole, and a clearance position away from the mounting hole; and two pole posts connected to the cover plate, the explosion-proof valve cover being located between the two pole posts.

[0008] Furthermore, the protective component is positioned at a distance from the explosion-proof valve cover, and / or the explosion-proof valve ring is integrally formed with the explosion-proof valve cover.

[0009] Furthermore, the cross-section of the explosion-proof valve ring is an elliptical ring, and / or, grooves are provided along the circumference of the explosion-proof valve cover, with a groove depth of 0.3mm~0.7mm.

[0010] Furthermore, the mounting groove is a square groove, and / or the length direction of the mounting groove is parallel to the length direction of the cover plate, and / or the length of the mounting groove is A, and the width of the mounting groove is B, wherein 5mm≤A≤50mm, 3mm≤B≤20mm.

[0011] Furthermore, the strain gauge is bonded to the mounting groove, and / or the strain gauge is a strain gauge.

[0012] According to another aspect of the embodiments of this application, a battery cell is also provided, including a battery cell top cover, wherein the battery cell top cover is the aforementioned battery cell top cover.

[0013] According to another aspect of the embodiments of this application, a battery is also provided, including the above-mentioned battery cell, wherein the battery cell is one of lithium iron phosphate battery cell, ternary battery cell, lithium iron manganese phosphate battery cell, and sodium battery cell.

[0014] According to another aspect of the embodiments of this application, a vehicle is also provided, including a battery, which is the battery described above.

[0015] In this embodiment, the cell top cover includes a cover plate assembly and an explosion-proof valve assembly. The explosion-proof valve assembly is welded to the cover plate assembly, and the explosion-proof valve assembly is located near the bottom of the cover plate assembly. The explosion-proof valve assembly integrates a strain detection device, which can monitor the pressure changes inside the cell in real time. Through the corresponding conversion relationship between strain and internal pressure, the technical effect of converting the internal pressure information of the cell into a measurable strain signal is achieved, thereby solving the technical problem of difficulty in effectively identifying signs of thermal runaway in the early stage of thermal runaway. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of an optional battery cell top cover according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of an optional explosion-proof valve assembly according to an embodiment of this application;

[0019] Figure 3This is a schematic diagram of an optional battery cell top cover according to an embodiment of this application.

[0020] The attached figures contain the following labels:

[0021] 10. Cover plate assembly;

[0022] 11. Cover plate; 111. Mounting hole;

[0023] 12. Protective components;

[0024] 13. Pole post;

[0025] 14. Injection hole;

[0026] 20. Explosion-proof valve assembly;

[0027] 21. Explosion-proof valve ring;

[0028] 22. Explosion-proof valve cover; 221. Mounting groove; 222. Score;

[0029] 23. Strain testing components;

[0030] 24. Signal output device. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Combination Figures 1 to 3As shown, this embodiment provides a battery cell top cover, which includes a cover plate assembly 10 and an explosion-proof valve assembly 20. The explosion-proof valve assembly 20 is welded to the cover plate assembly 10 and is disposed near the bottom of the cover plate assembly 10. The explosion-proof valve assembly 20 includes a strain detection element 23, which is used to detect the pressure information inside the battery cell.

[0034] The technical solution of this embodiment includes a cover plate assembly 10 and an explosion-proof valve assembly 20. The explosion-proof valve assembly 20 is welded to the cover plate assembly 10 and is located near the bottom of the cover plate assembly 10. The explosion-proof valve assembly 20 integrates a strain sensor 23. The strain sensor 23 can monitor the pressure changes inside the battery cell in real time. Through the corresponding conversion relationship between strain and internal pressure, it converts the internal pressure information of the battery cell into a measurable strain signal. Under normal operating conditions, the internal pressure of the battery cell increases slowly, and the signal change of the strain sensor is relatively gradual. However, when the battery cell is in the early stage of thermal runaway, the internal pressure of the battery cell increases significantly due to the acceleration of side reactions. The strain sensor can detect this sudden increase in signal change, thereby providing timely warning of possible thermal runaway. This technical solution does not require complex voltage / temperature parameter analysis and algorithm simulation calculations, nor does it rely on temperature monitoring of specific parts of the battery cell, simplifying the thermal runaway warning process and improving the accuracy and timeliness of the warning. By monitoring changes in the internal pressure of the battery cell in real time, the technical solution of this invention can achieve early warning of thermal runaway, effectively improving the safety and stability of lithium-ion battery cells.

[0035] Furthermore, the explosion-proof valve assembly 20 includes an explosion-proof valve ring 21, an explosion-proof valve cover 22, a strain gauge 23, and a signal output device 24. The explosion-proof valve ring 21 is welded to the cover plate assembly 10. The explosion-proof valve cover 22 is connected to the cover plate assembly 10 through the explosion-proof valve ring 21. The explosion-proof valve ring 21 is arranged circumferentially along the explosion-proof valve cover 22. The explosion-proof valve cover 22 has a mounting groove 221, and the strain gauge 23 is located in the mounting groove 221. The signal output device 24 is located in the mounting groove 221 and is connected to the strain gauge 23. The signal output device 24 is used to transmit electrical signals.

[0036] Combination Figure 2As shown, in this embodiment, the explosion-proof valve assembly includes an explosion-proof valve ring 21 and an explosion-proof valve cover 22, wherein the explosion-proof valve ring 21 and the cover plate assembly 10 are firmly connected by welding. The explosion-proof valve cover 22 forms an integral structure with the cover plate assembly 10 through the explosion-proof valve ring 21. The explosion-proof valve ring 21 is arranged circumferentially along the explosion-proof valve cover 22, ensuring the stability and safety of the structure. The explosion-proof valve cover 22 is designed with a mounting groove 221 for positioning and protecting the strain detection element 23, enabling it to accurately monitor the strain of the explosion-proof valve cover 22, thereby indirectly reflecting the internal pressure change of the battery cell. The signal output device 24 is also located in the mounting groove 221 and is tightly connected to the strain detection element 23, responsible for transmitting the electrical signal collected by the strain detection element 23 to the external monitoring system. This integrated design not only realizes real-time monitoring of the internal pressure of the battery cell, but also provides the ability to warn of thermal runaway while ensuring the safety and explosion-proof function. By monitoring the rate of change of internal pressure, a warning can be issued at a critical time point before the thermal runaway of the battery cell, buying valuable time for taking effective measures.

[0037] Furthermore, the cover plate assembly 10 includes a cover plate 11, a protective member 12, and a pole post 13. The cover plate 11 has a mounting hole 111, and the explosion-proof valve cover 22 is located in the mounting hole 111. The explosion-proof valve cover 22 is connected to the cover plate 11 through an explosion-proof valve ring 21. The protective member 12 is connected to the top surface of the cover plate 11. The protective member 12 has an installation position that blocks the mounting hole 111, and also has a clearance position that is away from the mounting hole 111. The pole post 13 is connected to the cover plate 11, and the pole post 13 protrudes from the cover plate 11. There are two pole posts 13, and the explosion-proof valve cover 22 is located between the two pole posts 13.

[0038] Combination Figure 1 As shown, in this embodiment, the cover plate assembly 10 integrates the explosion-proof valve assembly 20 and the protective component 12. The cover plate 11 has a mounting hole 111 for accommodating the explosion-proof valve assembly 20 (explosion-proof valve ring 21, explosion-proof valve cover 22, strain detection component 23, and signal output device 24). The explosion-proof valve cover 22 is tightly connected to the cover plate 11 through the explosion-proof valve ring 21. The cover plate 11 also has a liquid injection hole 14, and the protective component 12 is connected to the top surface of the cover plate 11, providing both a mounting position to block the mounting hole 111 and a clearance position to avoid the mounting hole 111. This ensures the safe closure of the explosion-proof valve under normal operating conditions and timely pressure release in case of thermal runaway. The pole post 13 is fixed to the cover plate 11 and protrudes from the surface of the cover plate 11. The explosion-proof valve cover 22 is installed between the two pole posts 13 (positive pole post and neutral pole post). This layout not only optimizes space utilization but also facilitates continuous monitoring of the internal pressure changes of the battery cell.

[0039] In one embodiment of this application, the protective component 12 may be made of, but is not limited to, polycarbonate, polyimide, polytetrafluoroethylene, polyethylene terephthalate, modified epoxy resin, and silicone. The strain gauge 23 is placed in the mounting groove 221 in the center of the explosion-proof valve cover 22, enabling real-time monitoring of the internal pressure change trend of the battery cell. The signal output device 24 converts the data collected by the strain gauge 23 into transmittable information, facilitating reception and analysis by external devices. Once the battery cell approaches a thermal runaway state, a significant increase in internal pressure will cause a sharp rise in the strain value recorded by the strain gauge 23. Feedback from the signal output device 24 can provide early warning of thermal runaway events, buying valuable time for countermeasures. Furthermore, the protective component 12 covers the explosion-proof valve assembly 20, effectively isolating it from electrolyte corrosion and ensuring the long-term reliability of the explosion-proof valve assembly 20, thereby significantly improving the safety performance and service life of the battery cell.

[0040] Furthermore, the protective element 12 is positioned at a distance from the explosion-proof valve cover 22. Maintaining this distance from the protective element 12 ensures a smoother, unobstructed bursting process when the explosion-proof valve cover 22 needs to burst in the event of thermal runaway of the battery cell to release internal pressure. This helps lower the pressure threshold required for bursting, allowing the explosion-proof valve assembly 20 to respond more quickly when the internal pressure of the battery cell reaches a critical value, thereby releasing pressure more rapidly and reducing the risk of explosion.

[0041] Furthermore, the explosion-proof valve ring 21 and the explosion-proof valve cover 22 are integrally formed. This integral forming avoids assembly errors between multiple components, reduces the risk of failure due to poor welding or bonding, and thus improves the overall structural integrity and sealing performance of the explosion-proof valve assembly 20. In the event of thermal runaway of the battery cell or under high pressure, it can more reliably prevent the leakage of internal materials from the battery cell, thereby enhancing the safety of the battery cell.

[0042] In one embodiment of this application, the thickness of the explosion-proof valve cover 22 is 1mm to 2mm. This ensures sufficient mechanical strength and durability of the explosion-proof valve cover, while also enabling it to respond quickly to subtle changes in the internal pressure of the battery cell. In the event of thermal runaway, it needs to burst rapidly when the preset pressure threshold is reached to release the internal pressure of the battery cell and prevent an explosion, thereby improving the sensitivity and accuracy of thermal runaway early warning.

[0043] Furthermore, the explosion-proof valve ring 21 has an elliptical cross-section. This elliptical cross-section provides a larger contact area during welding, helping to form a stronger weld joint and thus enhancing the seal between the explosion-proof valve assembly 20 and the cover plate assembly 10. This is crucial for preventing electrolyte leakage and maintaining a stable internal environment within the battery cell.

[0044] Furthermore, grooves 222 are provided circumferentially along the explosion-proof valve cover 22, with a depth of 0.3mm to 0.7mm. Combined with... Figure 3As shown, the circumferential grooves 222 on the explosion-proof valve cover 22 guide stress concentration along a predetermined path, making the pressure release during explosion more controllable and uniform. This helps avoid irregular explosions caused by excessive local stress, ensuring that the explosion-proof valve can open smoothly and completely in the event of thermal runaway, reducing the risk of fragmentation. This design ensures rapid response of the explosion-proof valve under extreme conditions while preventing premature failure in daily use, extending the effective service life of the explosion-proof valve and reducing battery maintenance costs.

[0045] Furthermore, the mounting groove 221 is a square groove. The square groove provides a more stable positioning for the strain gauge 23. Compared to circular or other irregular shapes, the four right-angled walls of the square groove can more effectively constrain the position of the strain gauge, reducing its displacement or rotation under the pressure inside the battery cell, thereby ensuring the accuracy and consistency of strain detection. In addition, the mounting groove 221 can be stretched or extruded from the explosion-proof valve cover 22, stabilizing the explosion-proof valve and preventing deformation and breakage during transportation, thus improving the opening stability of the explosion-proof valve.

[0046] Furthermore, the length direction of the mounting groove 221 is parallel to the length direction of the cover plate 11. The parallelism between the length direction of the mounting groove 221 and the length direction of the cover plate allows for more efficient use of the length space of the cover plate, which helps to optimize the internal structural layout of the battery cell within the limited top cover area.

[0047] Furthermore, the length of the mounting slot 221 is A, and the width of the mounting slot 221 is B, wherein 5mm≤A≤50mm and 3mm≤B≤20mm. The dimensional range of the mounting slot 221 ensures that the strain gauge 23 can be accurately and stably installed within the slot, avoiding installation misalignment or uneven stress on the strain gauge 23 due to dimensional mismatch, thereby improving the accuracy of internal pressure monitoring and the stability of signal transmission. In addition, the appropriate length A and width B also ensure that the strain gauge 23 has sufficient space for detecting minute deformations without occupying excessive space and affecting the layout of the internal structure of the battery cell.

[0048] Furthermore, the strain gauge 23 is bonded to the mounting groove 221. This arrangement enhances the mechanical connection between the two, reduces the risk of the strain gauge 23 falling off under external force, and helps stabilize the electrical connection between the strain gauge 23 and the signal output device 24. This ensures that the electrical signal can be continuously and stably transmitted to the signal output device 24 when the internal pressure of the battery cell changes, and then sent to the battery cell management system. This enables the effective execution of the thermal runaway early warning function and improves the overall structural stability and durability of the explosion-proof valve assembly 20.

[0049] Furthermore, the strain detection element 23 is a strain gauge. By tightly connecting the strain gauge to the mounting groove 221 of the explosion-proof valve cover 22, subtle fluctuations in the internal pressure of the battery cell can be sensitively detected, making it more sensitive to abnormal pressure increases in the early stages of thermal runaway. The strain gauge is typically equipped with a stable resistor or bridge circuit, which converts strain changes into electrical signals, enabling remote monitoring via the signal output device 24. This signal output method is more stable and reliable than other sensing technologies, such as light or sound sensing, and is less susceptible to interference from the external environment. The strain gauge is made of metal or semiconductor materials, exhibiting excellent temperature and chemical stability. Even in the complex electrochemical environment of the battery, it can maintain stable performance for extended periods, ensuring the long-term effectiveness of the thermal runaway early warning system.

[0050] In one embodiment of this application, the thickness of the explosion-proof valve cover 22 is set to 2mm, and the depth of the notch 222 is 0.7mm. The length of the mounting groove 221 is 5mm, and the width of the mounting groove 221 is 3mm. In this embodiment, because the mounting groove 221 is relatively small, it is more sensitive to the detection of local strain, but the monitoring range of the overall internal pressure change is small. It is suitable for scenarios that require precise monitoring of local stress changes, such as early warning of local thermal runaway inside the battery cell.

[0051] In one embodiment of this application, the thickness of the explosion-proof valve cover 22 is set to 1.5 mm, and the depth of the notch 222 is 0.4 mm. The length of the mounting groove 221 is 20 mm, and the width of the mounting groove 221 is 10 mm. The thickness and notch depth of the explosion-proof valve cover 22 provide a good balance, ensuring structural strength while allowing for more flexible setting of the burst pressure threshold. The longer mounting groove 221 facilitates the stable fixation of the strain gauge 23, increases the monitoring range, and improves the monitoring capability of pressure changes within the entire explosion-proof valve cover 22. This is suitable for most battery cell application scenarios and can effectively provide early warning of thermal runaway.

[0052] In one embodiment of this application, the thickness of the explosion-proof valve cover 22 is set to 1 mm, and the depth of the notch 222 is 0.7 mm. The length of the mounting groove 221 is 50 mm, and the width of the mounting groove 221 is 20 mm. The thinner thickness and deeper notch of the explosion-proof valve cover 22 enable it to respond more quickly in the event of thermal runaway, reducing the burst pressure and rapidly releasing internal pressure to prevent the battery cell from exploding. This design is particularly suitable for high-energy-density battery cells requiring rapid explosion-proof response or battery cells operating in special environments, such as fast charging or extreme temperature conditions. The longer and wider mounting groove 221 provides a larger contact surface for the strain gauge 23, increasing the number of monitoring points and improving the comprehensive monitoring of pressure changes within the entire explosion-proof valve cover 22. This is particularly suitable for battery cells with large internal pressure changes or where monitoring of the entire explosion-proof valve cover 22 area is required.

[0053] Furthermore, the strain detection element 23 is a strain gauge. By tightly connecting the strain gauge to the mounting groove 221 of the explosion-proof valve cover 22, subtle fluctuations in the internal pressure of the battery cell can be sensitively detected, making it more sensitive to abnormal pressure increases in the early stages of thermal runaway. The strain gauge is typically equipped with a stable resistor or bridge circuit, which converts strain changes into electrical signals, enabling remote monitoring via the signal output device 24. This signal output method is more stable and reliable than other sensing technologies, such as light or sound sensing, and is less susceptible to interference from the external environment. The strain gauge is made of metal or semiconductor materials, exhibiting excellent temperature and chemical stability. Even in the complex electrochemical environment of lithium-ion batteries, it can maintain stable performance for extended periods, ensuring the long-term effectiveness of the thermal runaway early warning system.

[0054] In another embodiment of this application, a battery cell is also provided, including a battery cell top cover, which is the battery cell top cover in the above embodiment.

[0055] Specifically, the battery cell includes a top cover, a lower housing, and an inner core. The lower housing is a cylindrical structure with one open end, and the top cover seals the open end of the lower housing. The inner core is located inside the lower housing and is electrically connected to the terminal post 13. The top cover includes a cover plate assembly 10 and an explosion-proof valve assembly 20 welded to it. The explosion-proof valve assembly 20 integrates a strain gauge 23 to monitor the internal pressure information of the battery cell. The battery cell has the ability to monitor internal pressure changes in real time and can quickly respond and issue an early warning when the internal pressure of the battery cell increases abnormally, i.e., during the thermal runaway incubation stage. This type of battery cell not only improves overall safety but also simplifies the implementation of thermal runaway early warning, no longer limited by complex data analysis and specific temperature monitoring points, ensuring the timeliness and accuracy of the early warning. In summary, the battery cell using the aforementioned top cover can achieve more efficient and direct thermal runaway early warning, significantly improving the safety management level of lithium-ion battery cells.

[0056] In another embodiment of this application, a battery is also provided, including the battery cell in the above embodiment, wherein the battery cell is one of lithium iron phosphate battery cell, ternary battery cell, lithium iron manganese phosphate battery cell, and sodium battery cell.

[0057] In this embodiment, the explosion-proof valve assembly 20, which integrates a strain detection element 23, not only ensures that explosion-proof requirements are met throughout the entire life cycle of the battery cell, but also detects abnormal changes in the internal pressure of the battery cell in a timely manner during the early stages of thermal runaway, effectively preventing the occurrence of thermal runaway and improving the overall safety of the battery. Because the strain detection element 23 can easily and quickly identify a battery cell about to experience thermal runaway, the battery system can take necessary safety measures before thermal runaway occurs, such as cutting off the circuit, activating the cooling system, or issuing an alarm, providing users with more escape time and significantly enhancing the safety and stability of the battery in actual use. Furthermore, this technical solution is applicable to battery cells with various chemical systems, broadening its application range in different battery types and demonstrating good versatility and practicality.

[0058] In another embodiment of this application, a vehicle is also provided, including a battery, which is the battery in the above embodiment, wherein the battery adopts the cell top cover in the above embodiment.

[0059] In this embodiment, the strain gauge 23 integrated in the explosion-proof valve assembly 20 monitors the internal pressure information of the battery cell in real time, enabling the vehicle to obtain timely feedback on the cell's status. During normal cell operation, the internal pressure increases slowly, and the signal change of the strain gauge 23 is gradual. However, in the early stages of thermal runaway, the accelerated side reactions cause a significant increase in the internal pressure of the cell, and the strain gauge 23 can detect this sudden increase in signal change, providing an early warning of potential thermal runaway. This technical solution simplifies the thermal runaway warning process, improves the accuracy and timeliness of the warning, and effectively enhances the safety and stability of the vehicle battery. As a result, the vehicle can identify cell anomalies earlier and take corresponding measures to ensure driving safety and the long-term reliability of the battery system.

[0060] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0062] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0063] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0064] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0065] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery cell top cover, characterized in that, include: Cover plate assembly (10); An explosion-proof valve assembly (20) is welded to the cover plate assembly (10). The explosion-proof valve assembly (20) is located near the bottom of the cover plate assembly (10). The explosion-proof valve assembly (20) includes a strain detection element (23), which is used to detect the pressure information inside the battery cell.

2. The cell top cover according to claim 1, characterized in that, The explosion-proof valve assembly (20) includes: Explosion-proof valve ring (21), which is welded to the cover plate assembly (10); An explosion-proof valve cover (22) is connected to the cover plate assembly (10) via the explosion-proof valve ring (21). The explosion-proof valve ring (21) is arranged along the circumference of the explosion-proof valve cover (22). The explosion-proof valve cover (22) has a mounting groove (221). The strain detection element (23) is located in the mounting groove (221). Signal output device (24) is located in the mounting slot (221) and is connected to the strain detection element (23). The signal output device (24) is used to transmit electrical signals.

3. The cell top cover according to claim 2, characterized in that, The cover plate assembly (10) includes: The cover plate (11) has a mounting hole (111), the explosion-proof valve cover (22) is located in the mounting hole (111), and the explosion-proof valve cover (22) is connected to the cover plate (11) through the explosion-proof valve ring (21); The protective component (12) is connected to the top surface of the cover plate (11), the protective component (12) has an installation position that blocks the mounting hole (111), and the protective component (12) has a clearance position away from the mounting hole (111); The pole (13) is connected to the cover plate (11) and the pole (13) protrudes from the cover plate (11). There are two poles (13), and the explosion-proof valve cover (22) is located between the two poles (13).

4. The cell top cover according to claim 3, characterized in that, The protective component (12) is disposed at a distance from the explosion-proof valve cover (22), and / or the explosion-proof valve ring (21) is integrally formed with the explosion-proof valve cover (22).

5. The cell top cover according to any one of claims 2-4, characterized in that, The explosion-proof valve ring (21) has an elliptical cross-section, and / or, grooves (222) are provided along the circumference of the explosion-proof valve cover (22), with a depth of 0.3mm to 0.7mm.

6. The cell top cover according to claim 3, characterized in that, The mounting groove (221) is a square groove, and / or the length direction of the mounting groove (221) is parallel to the length direction of the cover plate (11), and / or the length of the mounting groove (221) is A, and the width of the mounting groove (221) is B, wherein 5mm≤A≤50mm, 3mm≤B≤20mm.

7. The cell top cover according to any one of claims 2-4 and 6, characterized in that, The strain gauge (23) is bonded to the mounting groove (221), and / or the strain gauge (23) is a strain gauge.

8. A battery cell, comprising a top cover, characterized in that, The cell top cover is the cell top cover according to any one of claims 1 to 7.

9. A battery comprising the cell of claim 8, characterized in that, The battery cell is one of the following: lithium iron phosphate battery cell, ternary battery cell, lithium iron manganese phosphate battery cell, and sodium battery cell.

10. A vehicle, comprising a battery, characterized in that, The battery is the battery described in claim 9.

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