Battery pack and electric equipment

Abstract

The invention provides a battery pack, and relates to the field of batteries. The battery pack comprises single batteries, a box body and an exhaust valve, and each single battery is provided with an anti-explosion valve. The box body is provided with a containing space, and the single batteries are located in the containing space. The exhaust valve is arranged on the box body and comprises a valve plate. And the valve plate is provided with a ventilation seam. The ventilation seam can be opened under the action of the pressure difference between the containing space and the space outside the box body and can be closed after the pressure difference is eliminated. The hardness of the valve plate is H, and the unit is HA. The thickness of the valve plate is T, and the unit is mm. The length of the ventilation seam is L, the unit is mm, and L / (H * T) is larger than or equal to 0.042 and smaller than or equal to 20. Therefore, the exhaust valve is simple in structure, and the manufacturing cost and the manufacturing process complexity can be effectively reduced. Only by forming the ventilation seam in the valve plate, opening or closing of the ventilation seam is controlled through the pressure difference between the containing space and the space outside the box body, and therefore air pressure balance between the containing space and the space outside the box body is achieved.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and more specifically to a battery pack and an electrical device having the battery pack. Background Technology

[0002] During battery use, abnormal conditions such as overcharging, overheating, or internal short circuits can trigger thermal runaway, causing the electrolyte inside to decompose rapidly and generate a large amount of gas, resulting in a sharp increase in internal pressure of the battery pack. If the pressure cannot be released in time, it may cause the battery pack casing to expand, rupture, or even explode, seriously threatening user safety and equipment reliability. Therefore, battery packs are usually equipped with vent valves, such as umbrella valves, which open when the internal pressure of the battery pack is too high to release the gas inside in a timely manner. However, umbrella valves are one-way vent valves, and when the internal pressure of the battery pack is lower than the external ambient pressure, they cannot effectively balance the internal and external pressures of the battery pack. Furthermore, umbrella valves have a relatively complex structure and high manufacturing costs. Summary of the Invention

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problems of complex structure and high manufacturing cost of exhaust valve in conventional battery packs.

[0004] The battery pack disclosed herein includes individual cells, a housing, and an vent valve. Each individual cell is equipped with an explosion-proof valve. The explosion-proof valve provides a pressure relief channel in the event of thermal runaway in the individual cell, discharging high-temperature, high-pressure substances generated inside the cell to the outside to balance the pressure difference between the inside and outside of the cell. The housing has a receiving space in which the individual cells are located. The vent valve is located on the housing and includes a valve plate. The valve plate has a vent slit. The vent slit can open under the pressure difference between the receiving space and the outside space of the housing, and can close after the pressure difference is eliminated. The hardness of the valve plate is H, in units of HA. The thickness of the valve plate is T, in units of mm. The length of the vent slit is L, in units of mm, where 0.042 ≤ L / (H×T) ≤ 20.

[0005] In this disclosure, the exhaust valve has a simple structure. It achieves gas flow or isolation between the containment space and the external space by controlling the opening or closing of the vent slit using the pressure difference between the containment space and the external space, thus ensuring pressure balance between the two spaces. Furthermore, the exhaust valve has a flat overall structure, occupying little space, effectively reducing manufacturing costs and process complexity, and improving manufacturing efficiency.

[0006] Based on this, the ratio L / (H×T) of the length L of the vent joint to the product of the hardness H and thickness T of the valve plate is limited to a reasonable range of 0.042 to 20. If the ratio L / (H×T) is too small, i.e., less than 0.042, a larger pressure difference is required for the vent joint to open and form an effective exhaust channel, resulting in insufficient gas exchange between the containment space and the external space of the enclosure, thus reducing the gas exchange efficiency between the containment space and the external space of the enclosure. If the ratio L / (H×T) is too large, i.e., greater than 20, the vent joint is prone to accidental opening when the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, reducing the sealing performance of the battery pack 100. In addition, under a high pressure difference or after long-term use, the vent joint 31 may undergo permanent deformation or tearing, making it impossible for the vent joint to close effectively, thereby causing the exhaust valve to fail. By limiting the ratio L / (H×T) to 0.042~20, when the pressure difference between the containment space and the external space of the enclosure reaches the target pressure difference, the vent can open in time and form an effective exhaust channel, allowing for timely gas exchange between the containment space and the external space of the enclosure. At the same time, the vent will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0007] This disclosure also provides an electrical device that includes the aforementioned battery pack. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic cross-sectional view of a battery pack according to an embodiment of the present disclosure, wherein the vent seam is in a closed state.

[0012] Figure 2 for Figure 1 Another schematic cross-sectional view of the battery pack, in which the vent valve is in the open position.

[0013] Figure 3 for Figure 1 Another schematic cross-sectional view of the battery pack, in which the vent valve is in the open position.

[0014] Figure 4 for Figure 1 A magnified view of part A in the middle.

[0015] Figure 5 for Figure 1 A schematic diagram of the valve plate and waterproof and breathable membrane of the battery pack.

[0016] Figure 6 This is a schematic diagram of the structure of a valve plate according to another embodiment of the present disclosure.

[0017] Figure 7 This is a schematic diagram of the structure of a valve plate according to another embodiment of the present disclosure.

[0018] Figure 8 for Figure 1 A schematic diagram of the valve cover and valve plate of the battery pack.

[0019] Figure 9 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0020] Figure Labels Battery pack - 100; Individual battery - 10; Explosion-proof valve - 11; Box - 20; Storage space - 21; Box opening - 22; Valve plate - 30; Ventilation seam - 31; Narrow section - 311; Wide section - 312; Waterproof and breathable membrane - 40; Valve cover - 50; Mesh - 501; Cylindrical section - 51; Cover plate section - 52; Electrical equipment - 200. Detailed Implementation

[0021] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0022] <Example Battery Pack> refer to Figure 1 According to an embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple individual batteries 10 connected in series and parallel, and integrates a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. The battery pack 100 may also include a housing 20. The housing 20 has an internal receiving space 21, in which the aforementioned components are housed and sealed by a top cover, forming a complete functional unit capable of directly outputting electrical energy. The housing 20 effectively prevents external collisions, compression, and vibrations from affecting the individual batteries 10, the battery management system, electrical wiring, and other components inside the housing 20. Furthermore, the housing 20 also prevents external moisture or dust and other contaminants from entering the receiving space 21. The battery pack 100 can serve as a rechargeable battery and a power source for new energy vehicles, primarily used for storing and providing electrical energy.

[0023] A battery pack can be formed by connecting multiple individual cells 10 with similar capacity and internal resistance. For example, multiple individual cells 10 can be connected in series to form a battery pack, or multiple individual cells 10 can be connected in parallel to form a battery pack, or a portion of multiple individual cells 10 can be connected in series and another portion can be connected in parallel to form a battery pack.

[0024] The battery pack 100 may also include conductive elements. The conductive elements can electrically connect the terminals of at least two individual cells 10, i.e., the output terminals of the battery current, to realize the series or parallel connection of multiple individual cells 10.

[0025] The individual battery cell 10 is the basic energy storage unit in the battery pack 100, used to store and release electrical energy, and capable of converting chemical energy into electrical energy (discharging process) or storing electrical energy as chemical energy (charging process) through internal chemical reactions. In the battery pack 100, multiple individual batteries 10 can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, the individual battery cell 10 is a prismatic battery. In other embodiments, the individual battery cell 10 is a cylindrical battery. In other embodiments, the individual battery cell 10 is a pouch battery. In other embodiments, the individual battery cell 10 can also be other types of batteries. This disclosure does not limit its type.

[0026] Under abnormal conditions, the battery pack 100 may experience thermal runaway, which occurs when a short circuit, overcharging, or high temperature triggers a chain reaction of exothermic reactions within the individual battery cell 10, causing a rapid rise in temperature and loss of control. Thermal runaway not only damages the individual battery cell 10 but may also lead to safety accidents. The individual battery cell 10 is equipped with an explosion-proof valve 11, which is used to open promptly and provide an effective pressure relief channel when thermal runaway occurs. This valve rapidly discharges high-temperature substances (such as gases, electrolyte liquids, and copper and aluminum foil particles) generated during thermal runaway into the containment space 21 to balance the pressure difference between the inside and outside of the individual battery cell, thereby alleviating the internal pressure of the individual battery cell 10 and inhibiting the spread of thermal runaway.

[0027] The battery pack 100 may also include a vent valve. The housing 20 may also include a housing opening 22, with the vent valve located at the housing opening 22. The vent valve provides a gas passage to balance the air pressure between the housing space 21 and the external space when there is an imbalance between the air pressures. The vent valve may include a valve plate 30. The valve plate 30 has a vent slit 31. The vent slit 31 can open under the pressure difference between the housing space 21 and the external space, and can close after the pressure difference is eliminated. The hardness of the valve plate 30 is H, measured in HA. Figure 5The thickness of the valve plate 30 is T, in mm. The length of the vent slit 31 is L, in mm, where 0.042 ≤ L / (H×T) ≤ 20. Preferably, 0.28 ≤ L / (H×T) ≤ 18.6. More preferably, 8.4 ≤ L / (H×T) ≤ 13. Alternatively, the ratio L / (H×T) can also be 0.07, 0.1, 0.2, 0.3, 0.42, 0.8, 1.6, 2.4, 3.2, 4.6, 5, 5.8, 6.4, 7.2, 8, 9, 11, 12, 13.2, 14.6, 15, 16.8, 17.4, 18, 19, or 19.6. For illustrative purposes only, the valve plate 30 is made of silicone rubber. It should be noted that in this disclosure, the vent slit 31 is a gap structure. It should be understood that, for ease of description, the ventilation slit 31 is indicated by a line of a certain width in the accompanying drawings of this disclosure, but this should not be construed as a limitation on the actual size of the ventilation slit 31. It should be understood that the ventilation slit 31 can be physically very narrow, and its width can even approach zero, as long as it can achieve the function of ventilation.

[0028] Based on the above structure, the exhaust valve has a simple design. It only requires a vent slit 31 on the valve plate 30. The opening or closing of the vent slit 31 is controlled by the pressure difference between the receiving space 21 and the external space of the housing, thereby achieving gas flow or isolation between the receiving space 21 and the external space of the housing, ensuring pressure balance between them. Furthermore, the exhaust valve has a flat overall structure, occupying little space, effectively reducing manufacturing costs and process complexity, and improving manufacturing efficiency.

[0029] Based on this, the ratio L / (H×T) of the length L of the vent slit 31 to the product of the hardness H and thickness T of the valve plate 30 is limited to a reasonable range of 0.042 to 20. If the ratio L / (H×T) is too small, i.e., less than 0.042, the stiffness of the valve plate 30 is relatively too large. This requires a large pressure difference to open the vent slit 31 and form an effective exhaust channel, resulting in the inability to exchange gases in a timely manner between the containment space 21 and the external space of the casing, reducing the gas exchange efficiency between the containment space 21 and the external space of the casing. If the ratio L / (H×T) is too large, i.e., greater than 20, the stiffness and strength of the valve plate 30 are relatively too small. When the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the vent slit 31 is prone to accidentally opening, reducing the sealing performance of the battery pack 100. Furthermore, under high pressure differences or after prolonged use, the vent 31 may undergo permanent deformation or tearing, preventing it from closing effectively and causing the exhaust valve to fail. By limiting the ratio L / (H×T) to 0.042~20, when the pressure difference between the containing space 21 and the external space of the enclosure reaches the target pressure difference, the vent 31 can open in time and form an effective exhaust channel, allowing timely gas exchange between the containing space 21 and the external space of the enclosure. Simultaneously, the vent 31 will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0030] Further, 3mm ≤ L ≤ 300mm, and / or 0.1mm ≤ T ≤ 10mm, and / or 10HA ≤ H ≤ 95HA. Preferably, 5mm ≤ L ≤ 200mm, and / or 0.5mm ≤ T ≤ 2mm, and / or 10HA ≤ H ≤ 60HA. More preferably, 80mm ≤ L ≤ 160mm, and / or 0.8mm ≤ T ≤ 1.8mm, and / or 30HA ≤ H ≤ 50HA. Alternatively, L can be 12mm, 17mm, 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, 190mm, 210mm, 230mm, 250mm, 270mm, 280mm or 290mm, and / or T can be 1mm, 1.2mm, 1.4mm, 1.6mm, 2.8mm, 3.8mm, 4.2mm, 5mm, 6mm, 7mm, 8mm, 9mm or 9.5mm, and / or H can be 12HA, 14HA, 18HA, 22HA, 26HA, 34HA, 38HA, 42HA, 46HA, 54HA, 58HA, 62HA, 66HA, 70HA, 74HA, 78HA, 82HA, 86HA or 90HA.

[0031] If the length L of the vent 31 is too small, i.e. less than 3 mm, the opening of the vent 31 will be too small, resulting in a small cross-sectional area for gas flow, increased flow resistance, and reduced gas flow efficiency. If the length L of the vent 31 is too large, i.e. greater than 300 mm, the vent 31 is prone to accidental opening under external vibration or a small pressure difference, reducing the sealing performance of the battery pack 100.

[0032] If the thickness T and / or hardness H of the valve plate 30 are too small, the stiffness and strength of the valve plate 30 will be too low. When the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the vent 31 is prone to open accidentally, reducing the sealing performance of the battery pack 100. If the thickness T and / or hardness H of the valve plate 30 are too large, the stiffness of the valve plate 30 will be too large. This requires a large pressure difference to open the vent 31 and form an effective exhaust channel, resulting in the inability to exchange gases in a timely manner between the housing space 21 and the external space of the housing, reducing the gas exchange efficiency between the housing space 21 and the external space of the housing. In addition, under the action of pressure difference or when subjected to external vibration, excessive stiffness will hinder the valve plate 30 from effectively absorbing and dispersing these energies through elastic deformation, leading to stress concentration. This will make the valve plate 30 susceptible to damage, cracks, or even rupture, thus causing the exhaust valve to fail.

[0033] Back Figure 1 Under normal circumstances, that is, when the air pressure of the containment space 21 is balanced with that of the external space of the box, the vent 31 on the valve plate 30 is closed to block the flow of gas between the containment space 21 and the external space of the box.

[0034] refer to Figure 2 When the air pressure in the containment space 21 is greater than the air pressure in the external space of the box and the pressure difference is greater than the first target pressure difference, the valve plate 30 deforms to the side away from the containment space 21 under the action of the air pressure in the containment space 21, causing the vent 31 on it to open, forming a gas channel connecting the containment space 21 and the external space of the box, so as to allow the gas in the containment space 21 to be discharged to the external space of the box through the vent 31, thereby balancing the air pressure in the containment space 21 and the external space of the box, and preventing the box 20 from expanding, rupturing or even exploding due to excessive air pressure in the containment space 21.

[0035] This disclosure does not specifically limit the value of the first target pressure difference, as long as the air vent 31 remains closed when the pressure difference between the air pressure in the containing space 21 and the air pressure in the external space is less than or equal to the first target pressure difference, and opens when the pressure difference between the air pressure in the containing space 21 and the air pressure in the external space is greater than the first target pressure difference. For example, the value of the first target pressure difference can range from 1 kPa to 15 kPa. Preferably, the first target pressure difference is from 3 kPa to 12 kPa. More preferably, the value of the first target pressure difference is from 5 kPa to 10 kPa. Alternatively, the first target pressure difference can also be 2 kPa, 4 kPa, 7 kPa, 8 kPa, 9 kPa, or 14 kPa.

[0036] refer to Figure 3 When the air pressure in the external space of the enclosure is greater than the air pressure in the containment space 21 and the pressure difference is greater than the second target pressure difference, the valve plate 30 deforms towards the side closer to the containment space 21 under the action of the air pressure in the external space of the enclosure, causing the vent 31 on it to open, forming a gas channel connecting the containment space 21 and the external space of the enclosure. The gas in the external space of the enclosure can enter the containment space 21 through the vent 31, thereby balancing the air pressure in the containment space 21 and the external space of the enclosure, and preventing the enclosure 20 from squeezing the individual battery 10 in the containment space 21 due to negative pressure deformation, which would affect the structure, performance and safety of the battery pack 100.

[0037] This disclosure does not specifically limit the value of the second target pressure difference, as long as the air vent 31 remains closed when the pressure difference between the air pressure in the external space of the housing and the air pressure in the containing space 21 is less than or equal to the second target pressure difference, and opens when the pressure difference between the air pressure in the external space of the housing and the air pressure in the containing space 21 is greater than the second target pressure difference. For example, the value range of the second target pressure difference can be 3 kPa to 6 kPa. Preferably, the value range of the second target pressure difference is 3.5 kPa to 5.5 kPa. More preferably, the value range of the second pressure difference is 4 kPa to 5 kPa. Alternatively, the second pressure difference can also be 4.5 kPa.

[0038] refer to Figure 5 and Figure 6 The ventilation seam 31 has a straight structure.

[0039] The straight-line structure of the ventilation seam 31 has a simple geometry, which can effectively reduce the complexity of the manufacturing process and improve the manufacturing efficiency, as well as effectively reduce the manufacturing cost.

[0040] Further, 0.042 ≤ L / (H×T) ≤ 15. Preferably, 0.36 ≤ L / (H×T) ≤ 12.4. More preferably, 4 ≤ L / (H×T) ≤ 10. Alternatively, the ratio L / (H×T) can also be 0.08, 0.1, 0.2, 0.3, 0.4, 0.8, 1.4, 2, 2.6, 3.2, 4.8, 5.4, 6, 6.6, 7.2, 7.8, 8.4, 9, 9.6, 10.8, 11.4, 12, 12.8, 13.6, or 14.4.

[0041] If the ratio L / (H×T) is too small, meaning the hardness H and / or thickness T of the valve plate 30 are relatively large, then the stiffness of the valve plate 30 is too high. This requires a large pressure difference to open the vent 31 and form an effective exhaust channel, resulting in insufficient gas exchange between the housing space 21 and the external space of the housing, reducing the gas exchange efficiency between the housing space 21 and the external space of the housing. If the ratio L / (H×T) is too large, meaning the hardness H and / or thickness T of the valve plate 30 are relatively small, then the stiffness and strength of the valve plate 30 are too low. When the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the vent 31 is prone to accidentally opening, reducing the sealing performance of the battery pack 100. In addition, under a high pressure difference or after long-term use, the vent 31 may undergo permanent deformation or tearing, making it unable to close effectively, thus causing the exhaust valve to fail. Therefore, within the reasonable range of 0.042≤L / (H×T)≤15, when the pressure difference between the containing space 21 and the external space of the box reaches the target pressure difference, the vent 31 can open in time and form an effective exhaust channel, allowing timely gas exchange between the containing space 21 and the external space of the box. Furthermore, the vent 31 will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0042] In another embodiment, reference Figure 7 The ventilation seam 31 has a curved or bent structure. In some embodiments, the ventilation seam 31 has an arc-shaped structure. In other embodiments, the ventilation seam 31 has a wavy structure. In still other embodiments, the ventilation seam 31 has other curved or bent structures. This disclosure does not limit its structure. It should be understood that in this disclosure, when the ventilation seam 31 has a curved or bent structure, the length L of the ventilation seam 31 refers to its actual measured length after unfolding into a straight line.

[0043] In the confined space of the valve plate 30, a curved or bent structure can increase the effective length of the vent 31, allowing for a larger opening and gas flow cross-sectional area when the vent 31 is open, thereby improving the gas exchange efficiency between the accommodating space 21 and the external space of the housing. Furthermore, the curved or bent structure can effectively enhance the local stiffness and overall structural stability of the valve plate 30. This enables the valve plate 30 to better resist the effects of instantaneous pressure differences or external vibration impacts, reducing the possibility of accidental opening of the vent 31 and improving the reliability of the exhaust valve.

[0044] Further, 0.42 ≤ L / (H×T) ≤ 20. Preferably, 0.8 ≤ L / (H×T) ≤ 18. More preferably, 6 ≤ L / (H×T) ≤ 14. Alternatively, the ratio L / (H×T) can also be 1, 2.4, 3.8, 4.6, 5, 6.6, 7, 8.2, 9, 10, 11.5, 12, 13.4, 14.6, 15, 15.3, 16, 16.4, 17, 17.2, 18.6, 19, or 19.5.

[0045] If the ratio L / (H×T) is too small, meaning the hardness H and / or thickness T of the valve plate 30 are relatively large, then the stiffness of the valve plate 30 is too high. This requires a large pressure difference to open the vent 31 and form an effective exhaust channel, resulting in insufficient gas exchange between the housing space 21 and the external space of the housing, reducing the gas exchange efficiency between the housing space 21 and the external space of the housing. If the ratio L / (H×T) is too large, meaning the hardness H and / or thickness T of the valve plate 30 are relatively small, then the stiffness and strength of the valve plate 30 are too low. When the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the vent 31 is prone to accidentally opening, reducing the sealing performance of the battery pack 100. In addition, under a high pressure difference or after long-term use, the vent 31 may undergo permanent deformation or tearing, making it unable to close effectively, thus causing the exhaust valve to fail. Therefore, within the reasonable range of 0.42≤L / (H×T)≤20, when the pressure difference between the containing space 21 and the external space of the box reaches the target pressure difference, the vent 31 can open in time and form an effective exhaust channel, allowing timely gas exchange between the containing space 21 and the external space of the box. Furthermore, the vent 31 will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0046] In some embodiments, the valve plate 30 is circular. In other embodiments, the valve plate 30 is elliptical. In still other embodiments, the valve plate 30 has other configurations. This disclosure is not limited thereto. References Figure 7The maximum dimension of valve plate 30 is M, in mm, where 0.017 ≤ L / M ≤ 0.99, and / or 5 mm ≤ L ≤ 200 mm, and / or 10 mm ≤ M ≤ 300 mm. Preferably, 0.09 ≤ L / M ≤ 0.9, and / or 20 mm ≤ L ≤ 180 mm, and / or 30 mm ≤ M ≤ 280 mm. More preferably, 0.2 ≤ L / M ≤ 0.6, and / or 80 mm ≤ L ≤ 110 mm, and / or 10 mm ≤ M ≤ 300 mm. Alternatively, the ratio L / M can also be 0.05, 0.1, 0.16, 0.28, 0.3, 0.34, 0.4, 0.42, 0.48, 0.56, 0.64, 0.7, 0.82, or 0.94, and / or the length L of the valve plate 30 can also be 15mm, 25mm, 36mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 115mm, 120mm, 130mm, 140mm, 150mm, 160mm, or 170mm. The maximum dimension M of the valve plate 30 may be 28mm, 37mm, 46mm, 54mm, 67mm, 72mm, 86mm, 94mm, 100mm, 115mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, or 290mm. In some embodiments, the valve plate 30 has a circular cross-section. In other embodiments, the valve plate 30 has an elliptical cross-section. In still other embodiments, the valve plate 30 has a cross-section of other shapes. This disclosure does not limit the construction of its cross-section.

[0047] If the ratio L / M is too small, meaning the length L of the vent 31 is relatively small and / or the maximum size M of the valve plate 30 is relatively large, the opening of the vent 31 will be small, failing to provide sufficient gas flow area and reducing the gas exchange efficiency between the housing space 21 and the external space of the enclosure. Furthermore, it will reduce the space utilization of the valve plate 30 structure, resulting in material and space waste and increased manufacturing costs. If the ratio L / M is too large, meaning the length L of the vent 31 is relatively large and / or the maximum size M of the valve plate 30 is relatively small, the excessively long vent 31 will make it prone to accidental opening, reducing the sealing performance of the battery pack 100. It may also weaken the overall structural strength and rigidity of the valve plate 30. Therefore, within the reasonable range of 0.017 ≤ L / M ≤ 0.99, the vent 31 can provide sufficient gas flow area when open, improving the gas exchange efficiency between the housing space 21 and the external space of the enclosure. It can also effectively prevent the air gap 31 from opening accidentally, improve the space utilization of the valve plate 30 structure, reduce manufacturing costs, and ensure the overall structure and rigidity of the valve plate 30.

[0048] refer to Figure 4 The minimum distance from the vent 31 to the outer edge of the valve plate 30 is D4, in mm, where 2mm ≤ D4 ≤ 30mm. Preferably, 10mm ≤ D4 ≤ 22mm. More preferably, 14mm ≤ D4 ≤ 18mm. Alternatively, the minimum distance D4 from the vent 31 to the outer edge of the valve plate 30 can also be 3mm, 4mm, 5mm, 6mm, 8mm, 9mm, 12mm, 16mm, 20mm, 24mm, 26mm, 28mm, or 29mm.

[0049] In another embodiment, reference Figure 5 Multiple ventilation seams 31 are arranged at intervals along the transverse direction. It should be understood that the length L of the multiple ventilation seams 31 may be the same or different. It should be understood that the transverse direction of the ventilation seams 31 is the direction from one side to the other.

[0050] Compared to having only one vent slit 31, having multiple vent slits 31 effectively increases the total opening of the vent slits 31 when they are open. When the pressure difference between the containing space 21 and the external space of the box exceeds the target pressure difference, gas can be discharged or entered promptly and quickly through multiple horizontally spaced vent slits 31, improving the gas exchange efficiency between the containing space 21 and the external space of the box. At the same time, it can also improve the space utilization rate of the valve plate 30 structure.

[0051] Further, 0.042 ≤ L / (H×T) ≤ 18. Preferably, 2.4 ≤ L / (H×T) ≤ 16. More preferably, 8 ≤ L / (H×T) ≤ 12. Alternatively, the ratio L / (H×T) can also be 0.06, 0.08, 0.5, 1, 1.2, 3.6, 4.8, 5.6, 6, 7.2, 8.4, 9.6, 10.7, 11.5, 13, 14.2, 15.4, 16.6, or 17.8.

[0052] If the ratio L / (H×T) is too small, meaning either the length L of each vent 31 is relatively small, or the hardness H and / or thickness T of the valve plate 30 are relatively large, a larger pressure difference is required for the vent 31 to open and form an effective exhaust channel. This results in insufficient gas exchange between the containment space 21 and the external space of the enclosure, reducing the gas exchange efficiency between the containment space 21 and the external space of the enclosure. If the ratio L / (H×T) is too large, meaning the hardness H of the valve plate 30 and / or thickness T of the valve plate 30 are relatively small, the stiffness and strength of the valve plate 30 are too low. When the battery pack 100 is subjected to vibration or external impact, or under a small pressure difference, the vent 31 is prone to accidentally opening, reducing the sealing performance of the battery pack 100. Furthermore, under a high pressure difference or after prolonged use, the vent 31 may undergo permanent deformation or tearing, preventing the vent 31 from closing effectively and causing the exhaust valve to fail. Therefore, within the reasonable range of 0.042≤L / (H×T)≤18, when the pressure difference between the containing space 21 and the external space of the box reaches the target pressure difference, the vent 31 can open in time and form an effective exhaust channel, allowing timely gas exchange between the containing space 21 and the external space of the box and improving gas exchange efficiency. Furthermore, the vent 31 will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0053] Continue to refer to Figure 5The minimum distance between any two adjacent ventilation seams 31 is D1, in mm, where 0.2 ≤ D1 / T ≤ 200, and / or 1 mm ≤ D1 ≤ 100 mm, and / or 0.5 mm ≤ T ≤ 5 mm. Preferably, 20 ≤ D1 / T ≤ 160, and / or 20 mm ≤ D1 ≤ 80 mm, and / or 1.5 mm ≤ T ≤ 4 mm. More preferably, 60 ≤ D1 / T ≤ 110, and / or 40 mm ≤ D1 ≤ 60 mm, and / or 2.5 mm ≤ T ≤ 3 mm. Alternatively, the ratio D1 / T can also be 0.8, 1, 3, 6, 9, 12, 15, 18, 27, 33, 39, 42, 48, 56, 60, 70, 80, 90, 100, 120, 130, 140, 150, 170, 180 or 190, and / or D1 can also be 5mm, 15mm, 25mm, 30mm, 35mm, 45mm, 50mm, 55mm, 65mm, 70mm, 75mm, 85mm, 90mm or 95mm, and / or T can also be 0.8mm, 1.1mm, 1.4mm, 1.7mm, 2mm, 2.3mm, 2.6mm, 2.9mm, 3.4mm, 3.7mm, 4.3mm, 4.6mm or 4.9mm.

[0054] If the ratio D1 / T is too small, meaning the minimum distance D1 between any two adjacent vent seams 31 is relatively small, then when the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the two adjacent vent seams 31 will affect each other, causing the vent seams 31 to open unexpectedly, reducing the sealing performance of the battery pack 100. Furthermore, under a higher pressure difference or after prolonged use, the vent seams 31 may undergo permanent deformation or tearing, preventing them from closing effectively and causing the exhaust valve to fail. If the ratio D1 / T is too large, meaning the minimum distance D1 between any two adjacent vent seams 31 is relatively large, it will reduce the space utilization rate of the valve plate 30 structure, resulting in material and space waste and increased manufacturing costs. Therefore, within the reasonable range of 0.2 ≤ D1 / T ≤ 200, the space utilization rate of the valve plate structure can be improved. Simultaneously, it can effectively reduce the influence between any two adjacent vent seams 31, preventing the vent seams 31 from opening unexpectedly due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0055] In another embodiment, reference Figure 6 Multiple ventilation seams 31 are arranged at intervals along the longitudinal direction. It should be understood that the length L of the multiple ventilation seams 31 may be the same or different. It should be understood that the longitudinal direction of the ventilation seam 31 is the direction from one end to the other.

[0056] Compared to having only one vent slit 31, having multiple vent slits 31 can effectively increase the total opening of the vent slits 31 when they are open. When the pressure difference between the containing space 21 and the external space of the box exceeds the target pressure difference, gas can be discharged or enter in a timely and rapid manner through multiple longitudinally spaced vent slits 31, thereby improving the gas exchange efficiency between the containing space 21 and the external space of the box.

[0057] Further, 0.042 ≤ L / (H×T) ≤ 18. Preferably, 3 ≤ L / (H×T) ≤ 17. More preferably, 8 ≤ L / (H×T) ≤ 12. Alternatively, the ratio L / (H×T) can be 0.07, 0.4, 0.8, 1, 2, 4, 5, 6, 7, 9, 10, 11, 13, 14, 15, 16, 17, or 17.6.

[0058] If the ratio L / (H×T) is too small, meaning either the length L of each vent 31 is relatively small, or the hardness H and / or thickness T of the valve plate 30 is relatively large, then a large pressure difference is required for the vent 31 to open and form an effective exhaust channel. This results in insufficient gas exchange between the containment space 21 and the external space of the enclosure, reducing the gas exchange efficiency between the containment space 21 and the external space of the enclosure. If the ratio L / (H×T) is too large, meaning the hardness H of the valve plate 30 and / or the thickness T of the valve plate 30 is relatively small, then the stiffness and strength of the valve plate 30 are too small. When the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the vent 31 is prone to accidentally opening, reducing the sealing performance of the battery pack 100. In addition, under a high pressure difference or after prolonged use, the vent 31 may undergo permanent deformation or tearing, making it impossible for the vent 31 to close effectively. Therefore, within the reasonable range of 0.042≤L / (H×T)≤18, when the pressure difference between the containing space 21 and the external space of the box reaches the target pressure difference, the vent 31 can open in time and form an effective exhaust channel, allowing timely gas exchange between the containing space and the external space of the box and improving gas exchange efficiency. Furthermore, the vent 31 will not open accidentally due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0059] Continue to refer to Figure 6The minimum distance between any two adjacent ventilation seams 31 is D2, in mm, where 0.2 ≤ D2 / T ≤ 40, and / or 1 mm ≤ D2 ≤ 20 mm, and / or 0.5 mm ≤ T ≤ 5 mm. Preferably, 8 ≤ D2 / T ≤ 36, and / or 5 mm ≤ D2 ≤ 17 mm, and / or 1.5 mm ≤ T ≤ 4 mm. More preferably, 18 ≤ D2 / T ≤ 27, and / or 8 mm ≤ D2 ≤ 12 mm, and / or 2.5 mm ≤ T ≤ 3.5 mm. Alternatively, the ratio D2 / T can also be 0.8, 1.6, 2.7, 3.4, 4.2, 5, 6, 7, 8.6, 9.4, 10, 11, 12, 13, 14, 15, 16, 17.6, 19.4, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 34, or 38, and / or D2 can also be 1.8mm, 2.6mm, or 3.4mm. 4.2mm, 5.8mm, 6.4mm, 7.2mm, 8.6mm, 9.2mm, 10mm, 11.3mm, 12.8mm, 13.7mm, 14mm, 15mm, 16mm, 18mm or 19mm, and / or, T may also be 0.8mm, 1.1mm, 1.7mm, 2mm, 2.8mm, 3mm, 3.8mm, 4.3mm, 4.6mm or 4.9mm.

[0060] If the ratio D2 / T is too small, meaning the minimum distance D2 between any two adjacent vent seams 31 is relatively small, then when the battery pack 100 is subjected to vibration, external impact, or under a small pressure difference, the two adjacent vent seams 31 will affect each other, causing the vent seams 31 to open unexpectedly, reducing the sealing performance of the battery pack 100. Furthermore, under a higher pressure difference or after prolonged use, the vent seams 31 may undergo permanent deformation or tearing, preventing them from closing effectively and causing the exhaust valve to fail. If the ratio D2 / T is too large, meaning the minimum distance D2 between any two adjacent vent seams 31 is relatively large, it will reduce the space utilization rate of the valve plate structure, resulting in material and space waste and increased manufacturing costs. Therefore, within the reasonable range of 0.2 ≤ D2 / T ≤ 40, the space utilization rate of the valve plate structure can be improved. Simultaneously, it can effectively reduce the influence between any two adjacent vent seams 31, preventing the vent seams 31 from opening unexpectedly due to instantaneous pressure differences or external impacts, thereby improving the service life and reliability of the exhaust valve.

[0061] refer to Figure 4 In the cross-section of the vent 31, along the direction from the outer side to the inner side of the valve plate 30, the vent 31 sequentially includes a narrow portion 311 and a wide portion 312. It should be noted that the outer side of the valve plate 30 is the side of the valve plate 30 that faces away from the receiving space 21. The inner side of the valve plate 30 is the side of the valve plate 30 that is close to the receiving space 21.

[0062] According to the above structure, the narrow portion 311 is located on the outer side near the valve plate 30, which helps to maintain the sealing of the vent 31 when it is closed and prevents the vent 31 from opening accidentally. The wide portion 312 on the inner side can provide a larger opening when the vent 31 is open, forming a smooth exhaust channel. When the air pressure in the containment space 21 is greater than the air pressure in the external space of the box and the pressure difference is greater than the first target pressure difference, the gas in the containment space 21 can be discharged through the vent 31 in a timely and rapid manner, effectively improving the gas discharge efficiency.

[0063] Further reference Figure 4 The width of the valve plate 312 gradually expands outward as it approaches the inner side of the valve plate 30.

[0064] According to the above structure, the wide portion 312 forms a guiding slope on the inner side of the valve plate 30, which can more effectively convert the air pressure force acting on the inner side of the valve plate's receiving space 21 into a force that opens the vent 31. When the air pressure in the receiving space 21 is greater than the air pressure in the external space of the housing and the pressure difference is greater than the first target pressure difference, the vent 31 can open in time to form a gas channel, allowing the gas in the receiving space 21 to be discharged into the external space of the housing in a timely manner. In addition, the wide portion 312 with its slope structure allows the vent 31 to have a larger opening under the same pressure, improving exhaust efficiency.

[0065] In another embodiment, reference Figure 5 The exhaust valve also includes a waterproof and breathable membrane 40. The waterproof and breathable membrane 40 is attached to the valve plate 30 and covers the breathable slit 31.

[0066] The waterproof and breathable membrane 40 allows gas to pass through while preventing the passage of moisture, dust, and other contaminants. By attaching the waterproof and breathable membrane 40 to the valve plate 30 and covering the vent seam 31, gas exchange can be ensured when the air pressure in the containment space 21 is unbalanced with the air pressure outside the box. Simultaneously, it prevents moisture, dust, and other contaminants from the outside of the box from entering the containment space 21 through the vent seam 31. The waterproof and breathable membrane 40 can be made of materials such as fiber aerogel, polytetrafluoroethylene microporous membrane, or ceramic fiber.

[0067] Further reference Figure 5 The waterproof and breathable membrane 40 is located on the inner side of the valve plate 30.

[0068] According to the above structure, when the air pressure in the containment space 21 is greater than the air pressure in the external space of the box and the pressure difference is greater than the first target pressure difference, the valve plate 30 deforms to the side away from the containment space 21 under the action of the air pressure in the containment space 21. The waterproof and breathable membrane 40 will not obstruct the opening of the vent 31, allowing the vent 31 on the valve plate 30 to open smoothly, forming a gas channel connecting the containment space 21 and the external space of the box, so that the gas in the containment space 21 can be discharged to the external space of the box through the vent 31, thereby balancing the air pressure in the containment space 21 and the external space of the box. If the waterproof and breathable membrane 40 is located on the outside of the valve plate 30, when the air pressure in the containment space 21 is greater than the air pressure in the external space of the box and the pressure difference is greater than the first target pressure difference, the waterproof and breathable membrane 40 will obstruct the deformation of the valve plate 30 to the side away from the containment space 21, thereby affecting the opening degree of the vent 31, thus reducing the gas discharge efficiency of the gas in the containment space 21 to the external space of the box.

[0069] In another embodiment, reference Figures 1 to 3 The exhaust valve also includes a valve cover 50. The valve cover 50 is located on the outside of the valve plate 30 and covers the vent slit 31. The valve cover 50 has multiple mesh holes 501.

[0070] According to the above structure, by covering the vent 31 with the valve cover 50, the direct impact of external forces on the vent 31 can be effectively blocked, thereby preventing the vent 31 from accidentally opening or being damaged, and improving the sealing and safety performance of the battery pack 100. Simultaneously, when the pressure difference between the containment space 21 and the external space of the enclosure is greater than the first target pressure difference or the second target pressure difference, the gas can smoothly exit into the external space of the enclosure through the multiple mesh openings 501 on the valve cover 50, or the gas can enter into the containment space 21 through the multiple mesh openings 501 on the valve cover 50. This effectively prevents the gas exiting from the containment space 21 from accumulating inside the valve cover 50, causing excessive pressure inside the valve cover 50 and affecting the gas exiting from the containment space 21. Furthermore, the gas exiting from the containment space 21 may contain flammable and toxic substances, which can easily cause deflagration after accumulating to a certain concentration.

[0071] Further, refer to Figure 8 The valve cover 50 covers the entire valve plate.

[0072] By covering the entire valve plate with the valve cover 50, external impact forces can be blocked from directly impacting the valve plate 30 and the vent 31, thereby preventing damage to the valve plate 30 and the vent 31 and preventing the exhaust valve from failing.

[0073] refer to Figure 8 The valve cover 50 includes a cylindrical portion 51 and a cover portion 52. The cylindrical portion 51 surrounds the valve plate 30. The cover portion 52 is located at the end of the cylindrical portion 51 facing away from the valve plate 30.

[0074] According to the above structure, the cylindrical portion 51 can block the direct impact of external impact forces from multiple angles around the valve plate 30 on the valve plate 30, and the cover portion 52 can block the direct impact of external impact forces on the outer side of the valve plate 30 and the vent 31, thereby effectively preventing the vent 31 from opening accidentally, and also preventing the exhaust valve from failing due to damage to the valve plate 30 and the vent 31 caused by external impact forces. This helps the valve cover 50 to better and more comprehensively protect the valve plate 30 and the vent 31, avoid the direct impact of external impact forces on the valve plate 30 and the vent 31, and improve the reliability and safety of the battery pack 100.

[0075] Continue to refer to Figure 8 The area of ​​the cover plate portion 52 is S1, in mm. 2 The cover plate 52 has a plurality of mesh openings 501, which may include n mesh openings 501. The areas of the n mesh openings 501 may be the same or different. The areas of the plurality of mesh openings 501 may be a1 to an, respectively, in mm. 2 The sum of the areas of multiple mesh 501 is S2, in mm. 2 Where S2 = a1 + a2 + ... + an, and S1 > S2. For example only, 1.02 ≤ S1 / S2 ≤ 5, and / or 80mm 2 ≤S1≤31400mm 2 , and / or 16mm 2 ≤S2≤25120mm 2 Preferably, 1.5 ≤ S1 / S2 ≤ 4.5, and / or, 800 mm 2 ≤S1≤28000mm 2 , and / or 400mm 2 ≤S2≤20000mm 2 More preferably, 2.4 ≤ S1 / S2 ≤ 3.2, and / or, 2000 mm 2 ≤S1≤20000mm 2 , and / or 1000mm 2 ≤S2≤14000mm 2 Alternatively, the ratio S1 / S2 can also be 1.2, 1.8, 2.2, 2.8, 3.6, 4.2, or 4.8, and / or S1 can also be 160mm. 2 430mm 2 1000mm 2 1500mm 2 3200mm 2 4800mm 2 6200mm 2 8400mm 2 9200mm 210000mm 2 13000mm 2 16000mm 2 19000mm 2 22000mm 2 26000mm 2 Or 28000mm 2 And / or, S2 can also be 120mm 2 300mm 2 520mm 2 640mm 2 750mm 2 860mm 2 970, 1200, 1800, 2800mm 2 3600mm 2 5400mm 2 7200mm 2 8600mm 2 9000mm 2 10000mm 2 12000mm 2 16000mm 2 18000mm 2 Or 22000mm 2 .

[0076] If the ratio S1 / S2 is too small, meaning the sum of the areas of the multiple mesh openings 501, S2, is relatively large, the structural strength of the cover plate 52 will be excessively weakened. This will prevent the cover plate 52 from effectively blocking the direct impact of external forces on the valve plate 30 and the vent 31, potentially causing the vent 31 to open accidentally or even damage the valve plate 30 and / or the vent 31, thus reducing the sealing performance of the battery pack 100. If the ratio S1 / S2 is too large, meaning the sum of the areas of the multiple mesh openings 501, S2, is relatively small, the flow resistance when gas exits or enters through the multiple mesh openings 501 will be too high, reducing the gas exchange efficiency between the containment space 21 and the external space of the enclosure. Therefore, within the reasonable range of 1.02 ≤ S1 / S2 ≤ 5, the valve cover 50 as a whole can more effectively protect the internal valve plate 30 and the vent 31, preventing the vent 31 from opening accidentally. When the pressure difference between the containment space 21 and the external space of the box is greater than the target pressure difference, it can ensure that the gas exchange efficiency between the containment space 21 and the external space of the box is high, so that the gas in the containment space 21 is discharged in time, or the gas in the external space of the box enters the containment space 21 in time.

[0077] In another embodiment, reference Figures 5 to 7 Both ends of the vent slit 31 are spaced apart from the outer edge of the valve plate 30.

[0078] Based on the above structure, the stress acting on the vent 31 can be prevented from being directly transmitted to the outer edge of the valve plate 30. This prevents stress concentration during repeated opening and closing of the vent 31, which could cause damage, cracks, or tears to the outer edge of the valve plate 30, thus effectively enhancing the integrity and structural strength of the valve plate 30. Furthermore, the fact that both ends of the vent 31 are spaced apart from the outer edge of the valve plate 30 ensures the sealing performance of the vent 31 when closed, preventing localized air leakage at the outer edge of the valve plate 30, thereby improving the overall sealing performance and reliability of the exhaust valve.

[0079] Further, refer to Figure 7 The minimum distance from both ends of the vent slit 31 to the outer edge of the valve plate 30 is D3, in mm, where 0.2 ≤ D3 / T ≤ 100. Preferably, 10 ≤ D3 / T ≤ 80. More preferably, 30 ≤ D3 / T ≤ 60. Alternatively, the ratio D3 / T can also be 1.2, 3.6, 5.8, 8.2, 10.4, 12.6, 15, 17.2, 19.4, 22, 26.4, 32, 46, 58, 67, 72, 86, 90, or 90.6. By way of example only, 1 mm ≤ D3 ≤ 50 mm, and / or 0.5 mm ≤ T ≤ 5 mm.

[0080] If the ratio D3 / T is too small, meaning the minimum distance D3 from both ends of the vent 31 to the outer edge of the valve plate 30 is relatively small, it will weaken the structural integrity and strength of the valve plate's outer edge. During the repeated opening and closing of the vent 31, the outer edge of the valve plate 30 is prone to damage, cracking, or tearing, increasing the risk of localized leakage and reducing the overall reliability of the exhaust valve. If the ratio D3 / T is too large, meaning the minimum distance D3 from both ends of the vent 31 to the outer edge of the valve plate 30 is relatively large, it will reduce the space utilization of the valve plate structure, resulting in material and space waste and increasing manufacturing costs. Therefore, within the reasonable range of 0.2 ≤ D3 / T ≤ 100, the integrity and structural strength of the valve plate 30 can be ensured, while also improving the utilization rate of the valve plate structure.

[0081] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0082] By way of example only, electrical equipment can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0083] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0084] In a non-restrictive example, refer to Figure 9The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle.

[0085] <Examples and Comparative Examples> The following specific embodiments and comparative examples are provided to illustrate the influence of the valve plate provided in this disclosure on the sealing performance and exhaust effect of the housing.

[0086] I. The valve plates in the following examples and comparative examples can be prepared using the following methods.

[0087] 1. Material preparation and mixing.

[0088] High-purity methyl vinyl silicone rubber raw material with excellent high and low temperature resistance and aging resistance is selected. Reinforcing agents (such as silica), vulcanizing agents and other additives are added in precise weights according to the predetermined formula and mixed evenly in special equipment to produce a compound with suitable elasticity and strength.

[0089] 2. Mold forming and vulcanization.

[0090] Mold: A specially made high-precision mold is selected according to the required geometry, installation structure and external dimensions of the valve plate. The mold cavity has protrusions or cutting edges to form air gaps (usually made by micro-milling, laser engraving or inlaying ultra-thin steel sheets).

[0091] Vulcanization: A measured amount of compounded rubber is placed into a mold and subjected to high temperature and high pressure in a flat vulcanizing machine (e.g., maintaining a temperature of 160-180℃ and a pressure of 10-20MPa for several minutes to more than ten minutes). Under these conditions, the silicone rubber undergoes a chemical reaction to cure and mold, precisely replicating the valve plate body and the required air vent structure, thus completing the integral molding of the valve plate.

[0092] 3. Post-processing.

[0093] Demolding and trimming: Open the mold to remove the valve piece and remove any excess adhesive residue generated during molding.

[0094] Secondary vulcanization: The valve plates are placed in an oven for further heating treatment (e.g., at 200°C for 2-4 hours) to stabilize their chemical structure and improve their heat resistance and dimensional stability during long-term use.

[0095] II. The hardness tests involved in the following examples and comparative examples can be performed using the following methods.

[0096] 1. Preparations before testing: Silicone rubber with a flat, smooth, and clean surface was selected as the sample to be tested.

[0097] It was confirmed that the Shore A hardness tester used had been calibrated and that the indenter and foot were clean and undamaged.

[0098] 2. Shore hardness test steps: Step S1, place the test sample on the surface of a hard, flat, and stable platform.

[0099] Step S2, hold the Shore A hardness tester in hand, make its footplate contact the surface of the test sample smoothly, and ensure that the hardness tester is perpendicular to the test surface.

[0100] Step S3, apply pressure vertically and smoothly. After the value shown on the hardness tester is stable, read the hardness value.

[0101] Step S4, repeat steps S2 to S3 at least 5 different positions on the surface of the same test sample.

[0102] Step S5, discard the obviously abnormal measurement values, and take the average value of the remaining valid measurement values as the final result of the Shore hardness of the test sample.

[0103] III. The performance tests involved in the following examples and comparative examples can be carried out in the following manner.

[0104] Test 1: The sealing performance of the valve plate.

[0105] For the parameters in different examples and comparative examples, according to the above valve plate manufacturing method, 10 valve plates are made for each experimental group.

[0106] Correctly install the valve plates of the experimental group on the special tooling for sealing performance testing, ensure that they are firmly fixed and the interfaces are reliably sealed. Then, slowly and completely immerse the test tooling with the installed valve plates in water, make the highest point of the tooling 1 meter below the water surface, and keep it in this state for 30 min. After the test time arrives, take the tooling out of the water.

[0107] Take the sealing performance of the valve plate as Performance 1, which is a measure of the valve plate's ability to maintain airtight performance under normal operating conditions of the box. Observe whether water enters the tooling. When no water enters the tooling, it means that the sealing performance meets the requirements and Performance 1 is considered qualified.

[0108] Test 2: The exhaust rate of the valve plate.

[0109] For the parameters in different examples and comparative examples, according to the above valve plate manufacturing method, 10 valve plates are made for each experimental group.

[0110] Install the valve plate of the experimental group correctly onto the explosion-proof valve-specific exhaust rate testing fixture, ensuring it is securely fixed. Before starting the test, check and confirm that the test system is well-sealed, with no leaks around the connection between the fixture and the valve plate. Then, slowly increase the air pressure from 0 kPa, using a flow meter to measure and record the exhaust rate of the valve plate at every 1 kPa pressure difference during the pressurization process. Continue pressurizing and recording data until the pressure reaches 15 kPa or the exhaust rate stops increasing after the valve plate bursts.

[0111] The exhaust efficiency of the valve plate is used as performance 2 to measure whether the valve plate can open in a timely manner under the pressure difference in the chamber and the exhaust effect. The exhaust rate test results are observed to see if they meet the performance standards. When the exhaust rate test results meet the performance standards, it indicates that the exhaust effect meets the requirements, and performance 2 is considered qualified.

[0112] Observe whether the sealing performance and exhaust rate of the valve plate meet the requirements. If the sealing performance test and exhaust rate test results both meet the requirements, it is qualified; otherwise, it is unqualified.

[0113] The table below lists test data for several embodiments and comparative examples.

[0114] Referring to the table above, in any of Examples 1-1 to 2-6, the value of the formula L / (H×T) falls within the range of 0.042 to 20. Analysis of the table shows that in any of Examples 1-1 to 2-6, the provided valve plate demonstrated satisfactory performance in both Test 1 and Test 2. This verifies that when the formula value falls within the range of 0.042 to 20, the valve plate not only has good sealing performance but also good venting effect.

[0115] In contrast, in Comparative Examples 1-1 and 1-4, the value of formula L / (H×T) is greater than 20. Analysis of the table above shows that in Comparative Examples 1-1 and 1-4, although performance 1 is unqualified, performance 2 shows a qualified result. That is, the valve plates provided in Comparative Examples 1-1 and 1-4 fail in test 1 but pass in test 2. This verifies that when the value of formula L / (H×T) is greater than 20, the valve plate's sealing performance is poor.

[0116] Meanwhile, in Comparative Examples 1-2 and 1-3, the value of the formula L / (H×T) is less than 20. By analyzing the above table, it can be seen that in Comparative Examples 1-2 and 1-3, although Performance 1 is qualified, Performance 2 is unqualified. That is to say, the valve plates provided in Comparative Examples 1-2 and 1-3 are qualified in Test 1, but give a qualified performance in Test 2. This verifies that when the value of the formula L / (H×T) is less than 0.042, the exhaust effect of the valve plate is poor.

[0117] It should be noted that the various elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0118] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The disclosure of "a" or "an" used to describe a component or part does not exclude other components or parts.

[0119] It should be understood that although terms such as "first" or "second" may be used in the present disclosure to describe various elements (such as the first target pressure difference and the second target pressure difference), these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0120] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present disclosure. In addition, the above specific details are only for the purpose of illustration and easy understanding, and not for limitation. The above details do not limit the present disclosure to necessarily adopt the above specific details to implement.

[0121] The above is only the specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present disclosure, and all should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A battery pack, characterized by, The application relates to a battery exhaust valve. The battery exhaust valve comprises: a single battery provided with an explosion-proof valve for providing a pressure relief channel when the single battery is in thermal runaway, and discharging high-temperature and high-pressure substances generated in the single battery to the outside of the single battery to balance the pressure difference between the inside and outside of the single battery; a box provided with a containing space, and the single battery is located in the containing space; and an exhaust valve provided on the box and comprising a valve sheet provided with a gas-permeable gap, the gas-permeable gap being capable of being opened under the pressure difference between the containing space and the outside space of the box and being capable of being closed after the pressure difference is eliminated, the hardness of the valve sheet being H, the thickness of the valve sheet being T, the length of the gas-permeable gap being L, and 0.042<=L / (H*T)<=20.

2. The battery pack of claim 1, wherein, The gas-permeable gap is in a straight line structure.

3. The battery pack of claim 2, wherein, 0.042<=L / (H*T)<=15.

4. The battery pack of claim 1, wherein, The gas-permeable gap is in a curved or bent structure.

5. The battery pack of claim 4, wherein, The gas-permeable gap is in a circular arc structure.

6. The battery pack of claim 4, wherein, The gas-permeable gap is in a wave structure.

7. The battery pack of claim 4, wherein, 0.42<=L / (H*T)<=20.

8. The battery pack of claim 1, wherein, The maximum size of the valve sheet is M, 0.017<=L / M<=0.99, 5mm<=L<=200mm, 10mm<=M<=300mm.

9. The battery pack of claim 8, wherein, The minimum distance of the gas-permeable gap to the outer edge of the valve sheet is D4, 2mm<=D4<=30mm.

10. The battery pack of claim 1, wherein, A plurality of the gas-permeable gaps are arranged in a transverse direction.

11. The battery pack of claim 10, wherein, 0.042<=L / (H*T)<=18.

12. The battery pack of claim 10, wherein, The minimum distance between any two adjacent gas-permeable gaps is D1, 0.2<=D1 / T<=200, 1mm<=D1<=100mm, 0.5mm<=T<=5mm.

13. The battery pack of claim 1, wherein, A plurality of the gas-permeable gaps are arranged in a longitudinal direction.

14. The battery pack of claim 13, wherein, 0.042<=L / (H*T)<=18.

15. The battery pack of claim 13, wherein, The minimum distance between any two adjacent gas-permeable gaps is D2, 0.2<=D2 / T<=40, 1mm<=D2<=20mm, 0.5mm<=T<=5mm.

16. The battery pack of claim 1, wherein, In the cross section of the gas-permeable gap, the gas-permeable gap comprises a narrow part and a wide part in sequence along the direction from the outer side to the inner side of the valve sheet.

17. The battery pack of claim 16, wherein, The wide part gradually expands outward as it approaches the inner side of the valve sheet.

18. The battery pack of claim 1, wherein, The exhaust valve further comprises a waterproof gas-permeable film attached to the valve sheet and covering the gas-permeable gap.

19. The battery pack of claim 18, wherein, The waterproof gas-permeable film is arranged on the inner side of the valve sheet.

20. The battery pack of claim 1, wherein, The exhaust valve further comprises a valve cover arranged on the outer side of the valve sheet and covering the gas-permeable gap, and the valve cover is provided with a plurality of mesh holes.

21. The battery pack of claim 20, wherein, The valve cover covers the whole valve sheet.

22. The battery pack of claim 21, wherein, The valve cover comprises a cylinder part surrounding the valve sheet and a cover plate part arranged at one end of the cylinder part away from the valve sheet.

23. The battery pack of claim 22, wherein, The mesh holes are provided on the cover plate part, an area of the cover plate part is S1, unit: mm 2 , a sum of areas of the plurality of mesh holes is S2, unit: mm 2 , 1.02≤S1 / S2≤5, and / or, 80mm 2 ≤S1≤31400mm 2 , and / or, 16mm 2 ≤S2≤25120mm 2 .

24. The battery pack of claim 1, wherein, 3mm<=L<=300mm.

25. The battery pack of claim 1, wherein, 0.1mm<=T<=10mm.

26. The battery pack of claim 1, wherein, 10HA<=H<=95HA.

27. The battery pack of claim 26, wherein, The valve sheet is made of silicone rubber.

28. The battery pack of claim 1, wherein, Both ends of the gas-permeable gap are spaced apart from the outer edge of the valve sheet.

29. The battery pack of claim 28, wherein, The minimum distance between both ends of the gas-permeable gap and the outer edge of the valve sheet is D3, 0.2<=D3 / T<=100.

30. The battery pack of claim 29, wherein, 1 mm < D3 < 50 mm, and / or, 0.5 mm < T < 5 mm.

31. An electrical device, comprising: A battery pack comprising the battery pack according to any one of claims 1 to 30.

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