Battery pack and powered device

Abstract

The present disclosure provides a battery pack and an electric device with the same. The battery pack comprises a plurality of batteries, a box body and a umbrella valve. The box body has an inner space for accommodating the plurality of batteries. The umbrella valve is arranged on the box body and comprises an umbrella body, the bottom end of the umbrella body has a first umbrella edge and a second umbrella edge located radially inward of the first umbrella edge. When the gas pressure in the inner space exceeds the gas pressure in the outer space and the difference between the two is greater than a set pressure difference, the bottom end of the umbrella body is deformed outward to allow the gas to be discharged from the inner space to the outer space. According to the battery pack provided by the present disclosure, by arranging the first umbrella edge and the second umbrella edge radially inward of the first umbrella edge at the bottom end of the umbrella body, when the external liquid impacts the umbrella valve, the bottom end of the umbrella body is deformed due to the external impact force, the second umbrella edge radially inward of the first umbrella edge can be in close contact with the box body to form a sealing structure, which can effectively block the external liquid from entering the inside of the battery pack.

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] Umbrella valves, typically featuring one-way venting, are widely used for battery pack pressure relief. When the battery experiences excessive internal pressure due to overcharging, short circuits, or thermal runaway, the umbrella valve opens rapidly to allow internal gas to escape, preventing the battery pack from rupturing or exploding due to excessive pressure. However, battery packs may encounter external liquid impacts during application. For example, mobile devices with battery packs, especially vehicles, may traverse flooded areas. In particular, when dealing with external liquid impacts, the umbrella-shaped structure of conventional battery pack umbrella valves is prone to deformation and overturning under high-pressure water flow, leading to seal failure and allowing external moisture to enter the battery pack, thus affecting its performance, lifespan, and safety. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem that in conventional battery packs, the umbrella valve may deform unexpectedly under the impact of external liquid, causing external liquid to enter the battery pack.

[0004] The battery pack includes multiple batteries, a housing, and an umbrella valve. The housing has an internal space for accommodating the multiple batteries. The umbrella valve is located on the housing and includes an umbrella body, the bottom end of which has a first umbrella edge and a second umbrella edge located radially inward of the first umbrella edge. When the air pressure inside the housing exceeds the air pressure outside the housing, and the difference between the two is greater than a set pressure difference, the bottom end of the umbrella body folds outward to allow gas to escape from the housing to the outside.

[0005] When external liquid impacts the umbrella valve, the bottom of the umbrella body may deform unexpectedly due to the impact force. This reduces the seal, allowing external liquid to enter the battery pack. This can cause short circuits in the internal circuitry of the battery pack, potentially leading to thermal runaway, and accelerates the degradation of electrode materials, shortening the battery pack's lifespan. Furthermore, long-term water leakage can also cause a decline in insulation performance, possibly resulting in safety issues such as battery fires and explosions.

[0006] According to the battery pack provided in this disclosure, by providing a first umbrella edge and a second umbrella edge located radially inside the first umbrella edge at the bottom end of the umbrella body, when external liquid impacts the umbrella valve, the bottom end of the umbrella body deforms due to the external impact force, and the second umbrella edge located radially inside the first umbrella edge can form a sealing structure in close contact with the housing, which can effectively prevent external liquid from entering the battery pack.

[0007] This disclosure also provides an electrical device that includes the battery pack described above. 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 umbrella valve is in the closed state.

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

[0013] Figure 3 for Figure 1 A schematic diagram of the umbrella valve in the diagram.

[0014] Figure 4 for Figure 1 Schematic cross-sectional view of the central umbrella valve and reinforcing bars.

[0015] Figure 5 for Figure 1 Another schematic cross-sectional view of the central umbrella valve and the reinforcing ribs.

[0016] Figure 6 for Figure 1 Another schematic cross-sectional view of the central umbrella valve and the reinforcing ribs.

[0017] Figure 7 This is a schematic diagram of the umbrella valve and reinforcing ribs according to another embodiment of the present disclosure.

[0018] Figure 8 This is a schematic diagram of the umbrella valve and reinforcing ribs according to another embodiment of the present disclosure.

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

[0020] Explanation of reference numerals in the attached figures: Battery pack - 100; Battery - 10; Box - 20; Internal space - 21; Box opening - 22; Umbrella valve - 30; Main body - 31; First umbrella edge - 32; Second umbrella edge - 41; Umbrella edge section - 411; Spacing section - 412; Third umbrella edge - 42; 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 one embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple 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, in which the aforementioned components are housed within an internal space 21 and sealed by a top cover, forming a complete functional unit capable of directly outputting electrical energy. 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 batteries 10 with similar capacity and internal resistance. For example, multiple batteries 10 can be connected in series to form a battery pack, or multiple batteries 10 can be connected in parallel to form a battery pack, or a portion of multiple batteries 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 batteries 10, i.e., the output terminals of the battery current, to enable multiple batteries 10 to be connected in series or in parallel.

[0025] Battery 10 is the basic energy storage unit in the battery pack, 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 batteries 10 can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, battery 10 is a prismatic battery. In other embodiments, battery 10 is a cylindrical battery. In other embodiments, battery 10 is a pouch battery. In other embodiments, battery 10 may also be other types of batteries. This disclosure does not limit its type.

[0026] Under abnormal conditions, battery pack 100 may experience thermal runaway, which occurs when a short circuit, overcharging, or high temperature triggers a chain reaction of exothermic reactions inside battery 10, causing a rapid rise in temperature and loss of control. Thermal runaway can not only damage battery 10 but may also lead to safety accidents.

[0027] The housing 20 is a component used to store multiple batteries 10. Specifically, the housing 20 has an internal space 21 in which the multiple batteries 10 are stored. The housing 20 can effectively prevent external collisions, compression, vibrations, etc., from affecting the batteries 10, battery management system, electrical circuits, and other components inside the housing 20. In addition, the housing 20 can also prevent external moisture or dust and other contaminants from entering the interior of the housing 20.

[0028] The battery pack 100 may also include an umbrella valve 30. The housing 20 also has a housing opening 22, and the umbrella valve 30 is located on the housing 20 and at the housing opening 22. In the event of abnormal conditions such as thermal runaway in the battery pack 100, the umbrella valve provides an exhaust channel to discharge gas from the internal space 21 to the external space, thereby balancing the air pressure inside and outside the housing 20. Figure 2 and Figure 3 The umbrella valve 30 includes an umbrella body. When the air pressure in the inner space 21 exceeds the air pressure in the outer space and the difference between the two is greater than a set pressure difference, the bottom end of the umbrella body is deformed outward to allow gas to be discharged from the inner space 21 through the opening 22 of the box body to the outer space.

[0029] This disclosure does not specifically limit the value of the pressure difference, as long as the valve remains closed when the air pressure in the internal space 21 exceeds the air pressure in the external space and the difference between the two is less than or equal to the set pressure difference, and opens when the air pressure in the internal space 21 exceeds the air pressure in the external space and the difference between the two is greater than the set pressure difference. For example, the set pressure difference can range from 1 kPa to 15 kPa. Preferably, the set pressure difference can range from 3 kPa to 13 kPa. More preferably, the set pressure difference can range from 5 kPa to 11 kPa. Alternatively, the set pressure difference can range from 6 kPa, 7 kPa, 8 kPa, 9 kPa, or 10 kPa.

[0030] When external liquid impacts the umbrella valve, the bottom of the umbrella body may deform unexpectedly due to the external impact force. This reduces the sealing performance, allowing external liquid to enter the battery pack 100. This can cause a short circuit in the internal circuitry of the battery pack 100, potentially triggering thermal runaway, and accelerating the degradation of electrode materials, thus shortening the lifespan of the battery pack 100. Furthermore, long-term water leakage can lead to a decrease in insulation performance, potentially causing safety issues such as battery fires and explosions.

[0031] In this disclosure, references Figure 4The bottom end of the umbrella body has a first umbrella edge 32 and a second umbrella edge 41 located radially inside the first umbrella edge 32. By providing a first umbrella edge 32 and a second umbrella edge 41 located radially inside the first umbrella edge 32 at the bottom end of the umbrella body, when external liquid impacts the umbrella valve 30, the bottom end of the umbrella body deforms due to the external impact force. The deformation of the second umbrella edge 41 located radially inside the first umbrella edge 32 can form a tight seal with the housing 20, which can effectively prevent external liquid from entering the battery pack 100.

[0032] In one embodiment, the second umbrella edge 41 extends continuously in the circumferential direction.

[0033] The second umbrella edge 41 extends continuously in the circumferential direction, forming a better sealing structure and ensuring that the umbrella valve 30 has good sealing performance in all directions. In addition, this one-piece construction is simple, reliable, and easy to manufacture.

[0034] refer to Figure 3 and Figure 4 The umbrella body includes a conical or partially conical body portion 31. The bottom edge of the body portion 31 forms a first umbrella edge 32, and the second umbrella edge 41 is a protruding rib formed at the bottom of the inner circumferential surface of the body portion.

[0035] Based on the above structure, the protruding rib structure can enhance the structural strength and overall stability of the umbrella body, and can better prevent external liquid from entering the battery pack 100 when external liquid impacts the umbrella valve 30.

[0036] In one embodiment, reference Figure 4 The distance from the first umbrella edge 32 to the top edge of the main body 31 is L1, and the distance from the first umbrella edge 32 to the rib is L2, both in mm. 0.0067 ≤ L2 / L1 ≤ 1. Preferably, 0.1 ≤ L2 / L1 ≤ 0.9. More preferably, 0.4 ≤ L2 / L1 ≤ 0.6. Alternatively, the ratio L2 / L1 can be 0.02, 0.05, 0.2, 0.3, 0.5, 0.7, or 0.8.

[0037] Within the range of 0.0067 ≤ L2 / L1 ≤ 1, when external liquid impacts the umbrella valve 30, the second umbrella edge 41 can effectively prevent external liquid from entering the battery pack 100, avoiding damage to the components inside the battery pack 100 due to liquid ingress. Furthermore, when the air pressure inside the enclosure exceeds the air pressure outside the enclosure, and the difference between the two is greater than a set pressure difference, the first umbrella edge 32 and the second umbrella edge 41 can deform outwards to allow gas to escape from the enclosure space 21 to the outside space. If the ratio L2 / L1 is too small, i.e., the distance L2 from the first umbrella edge 32 to the rib is too small, the second umbrella edge cannot form a tight seal with the enclosure 20 when impacted by external liquid. Thus, the second umbrella edge 41 cannot effectively block external liquid. If the ratio L2 / L1 is too large, i.e., the distance L2 from the first umbrella edge 32 to the rib is too large, either the enclosure space needs a higher air pressure to open the second umbrella edge 41, reducing response efficiency. Either when the air pressure inside the chamber exceeds the air pressure outside the chamber and the difference between the two is greater than the set pressure difference, the second umbrella edge 41 will deform and come into close contact with the chamber body 20 to form a sealing structure, which will prevent the gas inside the chamber space 21 from being discharged.

[0038] Continue to refer to Figure 4 The radius of the first umbrella edge 32 is R1, and the radius of the second umbrella edge 41 is R2, both in mm, with 0.04 ≤ R2 / R1 ≤ 1. Preferably, 0.1 ≤ R2 / R1 ≤ 0.8. More preferably, 0.3 ≤ R2 / R1 ≤ 0.6. Alternatively, the ratio R2 / R1 can also be 0.2, 0.4, 0.5, 0.7, or 0.9.

[0039] If the ratio R2 / R1 is too small, meaning the radius R2 of the second umbrella edge 41 is too small, the second umbrella edge 41 can only deform when the internal space has a higher air pressure, allowing the gas in the internal space 21 to be discharged to the external space. Alternatively, when the second umbrella edge 41 deforms outward, it will come into close contact with the housing 20 to form a seal, preventing the gas in the internal space 21 from being discharged. If the ratio R2 / R1 is too large, meaning the radius R2 of the second umbrella edge 41 is too large, when external liquid impacts the umbrella valve 30, the deformation of the second umbrella edge 41 will prevent it from coming into close contact with the housing 20 to form a seal, allowing external liquid to enter the battery pack 100. Therefore, within the range of 0.04 ≤ R2 / R1 ≤ 1, when the air pressure in the internal space exceeds the air pressure in the external space and the difference between the two is greater than the set pressure difference, the first umbrella edge 32 and the second umbrella edge 41 can respond with timely deformation, allowing the gas to be discharged from the internal space 21 to the external space. Meanwhile, when impacted by external liquid, the deformation of the second umbrella edge 41 can form a tight seal with the housing 20, effectively preventing external liquid from entering the battery pack 100.

[0040] refer to Figure 4 , Figure 5 andFigure 6 The first umbrella edge 32 is axially lower than the second umbrella edge 41. For ease of description, in the accompanying drawings of this disclosure, S1 is used to indicate the axial direction of the umbrella valve.

[0041] The first umbrella edge 32 is axially lower than the second umbrella edge 41, meaning the first umbrella edge 32 is closer to the housing 20 than the second umbrella edge 41. The first umbrella edge 32 and the housing 20 form a tight seal, effectively preventing external dust, moisture, and other contaminants from entering. Furthermore, when external liquid impacts the umbrella valve 30, the second umbrella edge 41 deforms, forming a seal with the housing 20 and effectively preventing external liquid from entering the housing 20. If the first umbrella edge 32 is axially higher than the second umbrella edge 41, a gap will form between the first umbrella edge 32 and the housing 20, allowing external liquids and other contaminants to enter between the first umbrella edge 32 and the second umbrella edge 41. When the second umbrella edge 41 deforms, external liquids and other contaminants existing in the gap will enter the battery pack 100, affecting its performance and lifespan. Due to manufacturing processes, the surface of the housing 20 is not perfectly flat, but has minor unevenness. If the first umbrella edge 32 is equal to the second umbrella edge 41 in the axial direction, the second umbrella edge 41 may be in close contact with the housing 20, while the first umbrella edge 32 is not in close contact with the housing 20 to form a sealing structure, resulting in reduced sealing performance and allowing external dust, moisture and other pollutants to enter.

[0042] refer to Figure 5 The axial dimension of the main body 31 is H1, and the axial height difference between the first umbrella edge 32 and the second umbrella edge 41 can be H2, in mm. The ratio H2 / H1 can satisfy: 0.02≤H2 / H1≤10. Preferably, 2≤H2 / H1≤8. More preferably, 4≤H2 / H1≤6. Alternatively, the ratio H2 / H1 can be 0.5, 1, 1.5, 3, 3.5, 4.5, 5, 6.5, 7, or 9.

[0043] If the ratio H2 / H1 is too small, meaning the axial height difference H2 between the first umbrella edge 32 and the second umbrella edge 41 is too small, the air pressure inside the box 21 must exceed the air pressure outside the box, and the difference must be much greater than the set pressure difference, for the gas inside the box 21 to cause the second umbrella edge 41 to deform, allowing the gas inside the box to be discharged to the outside. Alternatively, the second umbrella edge 41 may deform and form a sealed structure with the box body 20, preventing the gas inside the box from escaping. If the ratio H2 / H1 is too large, meaning the axial height difference H2 between the first umbrella edge 32 and the second umbrella edge 41 is too large, when external liquid impacts the umbrella body, the second umbrella edge 41 may deform and fail to form a tight seal with the box body 20, allowing external liquid to enter the battery pack 100. Within a reasonable range of 0.02 ≤ H2 / H1 ≤ 10, when the air pressure inside the box exceeds the air pressure outside the box and the difference between the two is greater than the set pressure difference, both the first umbrella edge 32 and the second umbrella edge 41 can deform outward normally, allowing gas to be discharged from the box space 21 to the outside space. Furthermore, when external liquid impacts the umbrella valve 30, the deformation of the second umbrella edge 41 can form a sealing structure with the box body 20, effectively preventing external liquid from entering the battery pack 100.

[0044] In another embodiment, the thickness of the second umbrella edge 41 gradually decreases along the direction away from the body portion 31.

[0045] Based on the above structure, the thinner second umbrella edge 41 can better fit the box body 20, improving the sealing performance. The thinner second umbrella edge 41 is more sensitive to changes in internal pressure, enabling it to respond quickly and expel gas from the box space 21 to the outside space. The thicker bottom end of the rib has better structural strength and stability.

[0046] In some embodiments, the cross-section of the second umbrella edge 41 is triangular. In other embodiments, the cross-section of the second umbrella edge 41 is trapezoidal. In other embodiments, the cross-section of the second umbrella edge 41 is semi-circular. In other embodiments, the second umbrella edge 41 may also be other cross-sections that taper in a direction away from the body portion 31. This disclosure does not limit the type of cross-section.

[0047] refer to Figure 6 The bottom width of the second umbrella edge 41 is w, and the height of the second umbrella edge 41 is h, both in mm, with a ratio of 0.05 ≤ h / w ≤ 20. Preferably, 2 ≤ h / w ≤ 18, more preferably, 6 ≤ h / w ≤ 12. Alternatively, the ratio h / w can be 0.5, 1, 4, 8, 9, 10, 14, 16, 17, or 19.

[0048] If the ratio h / w is too small or too large, either the internal space 21 needs a higher air pressure to open the second umbrella edge 41, which reduces the response speed of the umbrella valve 30; or when external liquid impacts the umbrella valve 30, the second umbrella edge 41 deforms and cannot form a tight seal with the housing 20, thus failing to effectively prevent external liquid from entering the battery pack 100. Within the reasonable range of 0.05 ≤ h / w ≤ 20, when the air pressure inside the housing exceeds the air pressure outside the housing and the difference between the two is greater than the set pressure difference, the first umbrella edge 32 and the second umbrella edge 41 can respond quickly and deform outwards, allowing gas to be discharged from the internal space 21 to the external space. Furthermore, when external liquid impacts the umbrella valve 30, the deformation of the second umbrella edge 41 can form a seal with the housing 20, effectively preventing external liquid from entering the battery pack 100.

[0049] In another embodiment, continue to refer to Figure 6 The bottom width of the second umbrella edge 41 is w, and the distance from the first umbrella edge 32 to the top edge of the body 31 is L1, in mm. 0.0033 ≤ w / L1 ≤ 1. Preferably, 0.05 ≤ w / L1 ≤ 0.95. More preferably, 0.4 ≤ w / L1 ≤ 0.7. Alternatively, the ratio w / L1 can be 0.1, 0.2, 0.3, 0.5, 0.6, 0.8, or 0.9.

[0050] Within the range of 0.0033 ≤ w / L1 ≤ 1, the second umbrella edge 41 can effectively block external liquids and also allows the first umbrella edge 32 and the second umbrella edge 41 to deform outwards normally, ensuring that gas is discharged from the internal space to the external space. If the ratio w / L1 is too small, that is, the bottom width w of the second umbrella edge 41 is too small, the structural strength of the rib is too weak, and it cannot effectively prevent external liquids from entering the battery pack 100. If the ratio w / L1 is too large, that is, the bottom width w of the second umbrella edge is too large, the structural strength of the rib is too great, and the second umbrella edge 41 is not easy to deform outwards, which makes it difficult for gas in the internal space to be discharged to the external space.

[0051] In another embodiment, the thickness of the second umbrella edge 41 does not gradually decrease along the direction away from the body portion 31. In some embodiments, the cross-section of the second umbrella edge 41 is circular. In other embodiments, the cross-section of the second umbrella edge 41 is rectangular. In still other embodiments, the second umbrella edge 41 may also have a cross-section of other shapes. This disclosure does not limit its type.

[0052] In another embodiment, reference Figure 7 The second umbrella edge 41 includes a plurality of umbrella edge segments 411 arranged at intervals along the circumference, and a plurality of interval segments 412 are provided between the plurality of umbrella edge segments 411.

[0053] According to the above structure, the gas in the chamber space 21 can be discharged through the spacer section 412, reducing the direct impact on the second umbrella edge 41. The multiple umbrella edge sections 411 arranged circumferentially at intervals also reduce the overall rigidity of the second umbrella edge 41, making it easier for the second umbrella edge 41 to open when the air pressure in the chamber space 21 exceeds the air pressure in the chamber space and the difference between the two is greater than a set pressure difference. Furthermore, when external liquid impacts the umbrella valve 30, the second umbrella edge 41 can also form a sealing structure through the multiple umbrella edge sections 411 in close contact with the chamber body, effectively preventing external liquid from entering.

[0054] The second umbrella rim 41 may include n circumferentially spaced rim segments 411, with n interval segments 412 between them. The lengths of the n rim segments 411 may be the same or different. The lengths of the n interval segments 412 may also be the same or different. The lengths of the rim segments 411 may be s11 to s1n, and the sum of their lengths may be S1, in mm, where S1 = s1 + s2 + ... + s1n. The lengths of the interval segments 412 may be s21 to s2n, in mm. The sum of their lengths may be S2, in mm, where S2 = s21 + s22 + ... + s2n. In one example, refer to... Figure 7 The second umbrella edge 41 includes four umbrella edge segments 411 arranged circumferentially, with four spacer segments 412 between them. The length of each umbrella edge segment is s1, and the length of each spacer segment is s2. The ratio S1 / (S1+S2) can satisfy: 40%≤S1 / (S1+S2)≤95%. Preferably, 50%≤S2 / S1≤85%. More preferably, 60%≤S2 / S1≤75%. Alternatively, the ratio S1 / (S1+S2) can be 45%, 55%, 65%, 70%, 80%, or 90%.

[0055] Within a reasonable range of 40% ≤ S1 / (S1+S2) ≤ 95%, when the air pressure inside the chamber 21 exceeds the air pressure outside the chamber and the difference between the two is greater than the set pressure difference, the second umbrella edge 41 can respond promptly and deform outwards to allow gas to be discharged from the chamber 21 to the outside chamber. Furthermore, when external liquid impacts the umbrella valve 30, the second umbrella edge 41 can also effectively block the external liquid. If the ratio S1 / (S1+S2) is too large, i.e., the sum of the lengths of multiple umbrella edge segments S1 is too large, the second umbrella edge 41 will not easily deform outwards, resulting in the gas inside the chamber not being able to be discharged in time. If the ratio S1 / (S1+S2) is too small, i.e., the sum of the lengths of multiple umbrella edge segments S1 is too small, the second umbrella edge 41 cannot effectively block the external liquid when it impacts the umbrella valve 30.

[0056] In another embodiment, reference Figure 8The bottom end of the umbrella body also has a third umbrella edge 42, which is located radially inside the second umbrella edge 41.

[0057] By providing a third umbrella edge 42 on the radially inner side of the second umbrella edge 41, this multi-layer waterproof structure can more effectively prevent external liquid from entering when external liquid impacts the umbrella valve 30.

[0058] In some embodiments, the second umbrella edge 41 and the third umbrella edge 42 have different cross-sectional shapes.

[0059] By setting a second umbrella edge 41 and a third umbrella edge 42 with different cross-sectional shapes, it is possible to further prevent external liquid from entering the battery pack 100.

[0060] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0061] By way of example only, electrical equipment 200 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.

[0062] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0063] In a non-restrictive example, refer to Figure 9 The 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 200.

[0064] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0065] 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 use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0066] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first umbrella edge and the second umbrella edge), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0067] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0068] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: Multiple batteries; The housing has an internal space for accommodating the plurality of batteries; as well as An umbrella valve is provided on the box and includes an umbrella body. The bottom end of the umbrella body has a first umbrella edge and a second umbrella edge located radially inside the first umbrella edge. When the air pressure in the space inside the box exceeds the air pressure in the space outside the box and the difference between the two is greater than a set pressure difference, the bottom end of the umbrella body is deformed outward to allow gas to be discharged from the space inside the box to the space outside the box.

2. The battery pack according to claim 1, characterized in that, The umbrella body includes a conical or partially conical body portion, the bottom edge of the body portion forming the first umbrella edge, and the second umbrella edge being a protruding rib formed at the bottom of the inner circumferential surface of the body portion.

3. The battery pack according to claim 2, characterized in that, The distance from the first umbrella edge to the top edge of the main body is L1, and the distance from the first umbrella edge to the rib is L2, in mm, and 0.0067≤L2 / L1≤1.

4. The battery pack according to claim 2, characterized in that, The radius of the first umbrella edge is R1, and the radius of the second umbrella edge is R2, both in mm, and 0.04 ≤ R2 / R1 ≤ 1.

5. The battery pack according to claim 2, characterized in that, The first umbrella edge is lower than the second umbrella edge in the axial direction.

6. The battery pack according to claim 5, characterized in that, The dimension of the main body in the axial direction is H1, and the height difference between the first umbrella edge and the second umbrella edge in the axial direction is H2, in mm, where 0.02≤H2 / H1≤10.

7. The battery pack according to claim 2, characterized in that, The thickness of the second umbrella edge gradually decreases along the direction away from the main body.

8. The battery pack according to claim 7, characterized in that, The cross-section of the second umbrella edge is triangular.

9. The battery pack according to claim 8, characterized in that, The bottom width of the second umbrella edge is w, and the height of the second umbrella edge is h, both in mm, and 0.05≤h / w≤20.

10. The battery pack according to claim 8, characterized in that, The bottom width of the second umbrella edge is w, and the distance from the first umbrella edge to the top edge of the main body is L1, in mm, where 0.0033≤w / L1≤1.

11. The battery pack according to claim 7, characterized in that, The cross-section of the second umbrella edge is trapezoidal.

12. The battery pack according to claim 7, characterized in that, The cross-section of the second umbrella edge is semi-circular.

13. The battery pack according to claim 2, characterized in that, The cross-section of the second umbrella edge is circular.

14. The battery pack according to claim 2, characterized in that, The cross-section of the second umbrella edge is rectangular.

15. The battery pack according to claim 1, characterized in that, The second umbrella edge extends continuously in the circumferential direction.

16. The battery pack according to claim 1, characterized in that, The second umbrella edge includes a plurality of umbrella edge segments arranged at intervals along the circumference, with a plurality of interval segments provided between the plurality of umbrella edge segments.

17. The battery pack according to claim 16, characterized in that, The sum of the lengths of the plurality of umbrella edge segments is S1, and the sum of the lengths of the plurality of interval segments is S2, in mm, where 40% ≤ S1 / (S1+S2) ≤ 95%.

18. The battery pack according to claim 2, characterized in that, The bottom end of the umbrella body also has a third umbrella edge, which is located radially inside the second umbrella edge.

19. The battery pack according to claim 18, characterized in that, The second umbrella edge and the third umbrella edge have different cross-sectional shapes.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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