Battery pack and powered device

Abstract

The present disclosure provides a battery pack and an electrical equipment. The battery pack comprises a plurality of battery cells, a box body, an umbrella valve and a valve cover. The box body has an inner space for accommodating the plurality of battery cells. The umbrella valve is arranged on the box body and comprises an umbrella body. When the air pressure in the inner space exceeds the air pressure outside the box body and the difference between the two is greater than a set pressure difference, the umbrella edge of the umbrella body is deformed outward to allow the gas to be discharged from the inner space to the outer space. The valve cover is arranged on the box body and covers the umbrella body to block the direct impact of the external liquid on the umbrella edge. In the present disclosure, the valve cover is arranged outside the umbrella body and covers the umbrella body to block the direct impact of the external liquid on the umbrella edge. In this way, when the external liquid impacts the umbrella valve, the external liquid will not directly impact the umbrella valve, avoiding the direct impact of the external liquid on the umbrella valve, which in turn causes the umbrella edge to be deformed outward, and thus the external liquid to enter the inside of the battery pack, which helps to improve the electrical performance, service life and safety of the battery pack and other performances.

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 are widely used for pressure relief in battery packs due to their simple structure and low cost. Battery packs may encounter external liquid impacts during operation. For example, mobile devices with battery packs, especially vehicles, may traverse flooded areas. When the internal pressure of the battery pack becomes too high or the battery experiences thermal runaway, the umbrella valve deforms outward to allow internal gas to escape. However, in conventional battery packs, the umbrella-shaped structure of the umbrella valve is prone to deformation, overturning, or even tearing under high-pressure water flow when subjected to external liquid impacts. This leads to seal failure, allowing external moisture to enter the battery pack and consequently affecting its performance, lifespan, and safety. Utility Model Content

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

[0004] This disclosure provides a battery pack including multiple battery cells, a housing, an umbrella valve, and a valve cover. The housing has an internal space for accommodating the multiple battery cells. The umbrella valve is located on the housing and includes an umbrella body. 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 umbrella edge deforms outward to allow gas to escape from the housing to the outside. The valve cover is located on the housing and covers the umbrella body to prevent direct impact of external liquid on the umbrella edge.

[0005] In this disclosure, a valve cover is provided on the outside of the umbrella body, and the valve cover covers the umbrella body, thereby blocking the direct impact of external liquid on the umbrella edge. In this way, when external liquid impacts the umbrella valve, the external liquid will not directly impact the umbrella valve, avoiding the outward deformation of the umbrella edge caused by the direct impact of external liquid on the umbrella valve, and thus preventing external liquid from entering the internal space of the battery pack. This helps to improve the electrical performance, service life and safety of the battery pack.

[0006] This disclosure also provides an electrical device that includes the battery pack described above. Attached Figure Description

[0007] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0009] 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.

[0010] 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.

[0011] Figure 2 for Figure 1 Another schematic cross-sectional view of the battery pack, in which the umbrella valve is in the open position.

[0012] Figure 3 for Figure 1 A schematic diagram of the umbrella valve in the diagram.

[0013] Figure 4 for Figure 1 A schematic diagram of the structure of the umbrella valve and valve cover.

[0014] Figure 5 for Figure 4 Another structural diagram of the umbrella valve and valve cover.

[0015] Figure 6 for Figure 4 Another structural diagram of the valve cover.

[0016] Figure 7 for Figure 6 A schematic diagram of the structure of the first exhaust port group.

[0017] Figure 8 for Figure 6 Another structural diagram of the umbrella valve and valve cover.

[0018] Figure 9 This is a schematic diagram of the structure of an umbrella valve and a valve cover according to another embodiment of the present disclosure.

[0019] Figure 10 This is a schematic diagram of the structure of an umbrella valve and a valve cover according to another embodiment of the present disclosure.

[0020] Figure 11 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure. Detailed Implementation

[0021] Numerous specific details are set forth below to provide an understanding of the structure, function, and purpose 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] For ease of description, in the accompanying drawings of this disclosure, S1 is used to indicate the axis of the umbrella body.

[0023] <Example Battery Pack>

[0024] refer to Figure 1 According to one embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple battery cells 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, in which the aforementioned components are housed within a cavity 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.

[0025] A battery pack can be formed by connecting multiple battery cells 10 with similar capacity and internal resistance. For example, multiple battery cells 10 can be connected in series to form a battery pack, or multiple battery cells 10 can be connected in parallel to form a battery pack, or a portion of multiple battery cells 10 can be connected in series and another portion can be connected in parallel to form a battery pack.

[0026] The battery pack 100 may also include conductive elements. The conductive elements can electrically connect the terminals of at least two battery cells 10, i.e., the output terminals of the battery current, to realize the series or parallel connection of multiple battery cells 10.

[0027] Battery cell 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, multiple battery cells can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, the battery cell is a prismatic battery. In other embodiments, the battery cell is a cylindrical battery. In other embodiments, the battery cell is a pouch battery. In other embodiments, the battery cell can also be other types of batteries. This disclosure does not limit the type of battery.

[0028] The housing 20 is a component used to house multiple battery cells 10. Specifically, the housing 20 has an internal space 21 in which the multiple battery cells 10 are housed. The housing 20 effectively prevents external impacts, compression, and vibrations from affecting the battery cells 10, battery management system, electrical wiring, and other components inside the housing 20. In addition, the housing 20 also prevents external moisture or dust and other contaminants from entering the housing.

[0029] 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 battery cell 10, causing a rapid rise in temperature and loss of control. Thermal runaway can not only damage the battery cell but may also lead to safety accidents.

[0030] The battery pack 100 may also include an umbrella valve 30 and a valve cover 40. 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 31. 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 umbrella edge 32 of the umbrella body 31 is deformed outward to allow gas to be discharged from the inner space 21 through the opening 22 of the box to the outer space.

[0031] 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 chamber 21 exceeds the air pressure in the chamber outside and the difference between the two is less than or equal to the set pressure difference, and opens when the air pressure in the chamber 21 exceeds the air pressure in the chamber outside 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, and 10 kPa.

[0032] The valve cover 40 is installed on the housing 20 and covers the umbrella body 31. Its function is to block the direct impact of external liquid on the umbrella edge 32 when external liquid impacts.

[0033] When an external impact force strikes the umbrella valve 30, the umbrella edge 32 of the umbrella body 31 deforms outward due to the impact. Specifically, when external liquid impacts the umbrella valve 30, the umbrella edge 32 is easily deformed outward due to the impact force of the liquid, leading to reduced sealing and allowing external liquid to enter the internal space 21. This can cause a short circuit in the battery pack's internal circuitry, even triggering thermal runaway, and accelerates the degradation of electrode materials, shortening the battery pack's lifespan. Furthermore, long-term water leakage can lead to decreased insulation performance, potentially causing safety issues such as battery fires and explosions.

[0034] According to the battery pack 100 provided in this disclosure, by using a valve cover 40 to cover the umbrella body 31, the direct impact of external liquid on the umbrella edge 32 is blocked. In this way, when external liquid impacts the umbrella valve 30, the external liquid will not directly impact the umbrella valve 30, which can prevent the umbrella edge 32 from deforming outward due to direct impact of external liquid on the umbrella valve 30, thereby preventing external liquid from entering the internal space 21. This helps to improve the electrical performance, service life and safety performance of the battery pack 100.

[0035] refer to Figure 4 The valve cover 40 includes a valve cover peripheral wall 41 surrounding the umbrella body 31.

[0036] By arranging the valve cover 40's peripheral wall 41 around the umbrella body 31, it can block the direct impact of external liquids at multiple angles around the umbrella body 31 on the umbrella edge 32, effectively preventing external liquids from entering the box space 21.

[0037] Continue to refer to Figure 4 The valve cover 40 also includes a valve cover top wall 42 located on the top side of the umbrella body 31 and connected to the top of the valve cover peripheral wall 41.

[0038] By providing a valve cover top wall 42 on the top side of the umbrella body 31 that connects to the top of the valve cover peripheral wall 41, it is possible to prevent the umbrella edge 32 of the umbrella body 31 from deforming outward due to the impact of external liquid on the top side of the umbrella body 31. This helps the valve cover 40 to better protect the umbrella valve 30, avoid direct impact of external liquid on the umbrella valve 30, and effectively prevent external liquid from entering the box space 21.

[0039] In some examples, reference Figure 4 The valve cover top wall 42 is provided with at least one first exhaust hole.

[0040] By providing at least one first exhaust hole on the top wall 42 of the valve cover, the flow resistance during gas discharge can be reduced, ensuring that the gas discharged from the inner space 21 is discharged to the outside of the valve cover 40 through at least one first exhaust hole. This prevents the gas discharged from the inner space 21 from accumulating inside the valve cover 40, which could cause excessive gas pressure inside the valve cover 40 and affect the gas discharge from the inner space 21. In addition, the gas discharged from the inner space 21 may contain flammable and toxic substances, which can easily cause deflagration when they accumulate to a certain concentration.

[0041] Furthermore, the area of ​​the valve cover top wall 42 is S1, in mm. 2 The sum of the areas of at least one first vent hole is S2, in mm. 2 The ratio S2 / S1 is 30% ≤ S2 / S1 ≤ 95%. Preferably, it is 40% ≤ S2 / S1 ≤ 85%. More preferably, it is 50% ≤ S2 / S1 ≤ 75%. Alternatively, the ratio S2 / S1 can also be 35%, 45%, 55%, 60%, 65%, 70%, or 80%.

[0042] The ratio S2 / S1, which is the sum of the areas S2 of at least one first vent hole and the area S1 of the valve cover top wall 42, is limited to a reasonable range of 30% to 85%. If the ratio S2 / S1 is too small, i.e., the sum of the areas of at least one first vent hole is too small, the flow resistance during gas discharge will be too large, resulting in reduced exhaust efficiency. If the ratio S2 / S1 is too large, i.e., the sum of the areas of at least one first vent hole is too large, the valve cover top wall 42 will not be able to effectively block the direct impact of external liquid on the umbrella valve 30. By limiting the ratio S2 / S1 to 30% to 85%, the battery pack 100 will have a relatively high exhaust efficiency, while the valve cover top wall 42 can effectively block the direct impact of external liquid on the umbrella valve 30, preventing external liquid from entering the internal space 21.

[0043] In another embodiment, reference Figure 4 The valve cover top wall 42 includes a first unopened area 421 and a first open area surrounding the first unopened area 421, and at least one first exhaust hole is provided in the first open area.

[0044] The valve cover top wall 42 has a first unopened area 421 and a first open area that cooperate with each other, and at least one first exhaust hole is located in the first open area. In this way, not only can the direct impact of external liquid on the umbrella valve 30 be avoided, causing the umbrella edge 32 to deform outward due to the direct impact of external liquid, effectively blocking external liquid from entering the box space 21, but it can also ensure that when the air pressure in the box space 21 exceeds the air pressure in the box space and the difference between the two is greater than the set pressure difference, the umbrella edge 32 deforms outward, so that the gas in the box space 21 can be directly discharged through the first open area, reducing flow resistance.

[0045] refer to Figure 5 The orthographic projection of the umbrella edge 32 onto the top wall 42 of the valve cover surrounds the first un-perforated area 421. The radius of the orthographic projection of the umbrella edge 32 is R, and the distance from the orthographic projection of the umbrella edge 32 to the edge of the first un-perforated area 421 is D1, in mm. 20% ≤ D1 / R ≤ 80%. Preferably, 30% ≤ D1 / R ≤ 70%. More preferably, 40% ≤ D1 / R ≤ 60%. Alternatively, the ratio D1 / R can also be 25%, 35%, 45%, 50%, 55%, 65%, or 75%.

[0046] Within the range of 20% ≤ D1 / R ≤ 80%, the valve cover top wall 42 can not only effectively block the direct impact of external liquid on the umbrella valve 30, but also has relatively low flow resistance when gas is discharged from the box space 21. If the ratio D1 / R is too small, that is, the distance D1 from the orthographic projection of the umbrella edge 32 to the edge of the first un-perforated area 421 is too small, that is, the area of ​​the first un-perforated area 421 is too large, then the area of ​​the first perforated area is too small, which makes the flow resistance when gas is discharged from the box space 21 relatively large. If the ratio D1 / R is too large, that is, the distance D1 from the orthographic projection of the umbrella edge 32 to the edge of the first un-perforated area 421 is too large, that is, the area of ​​the first unperforated area 421 is too small, then the area of ​​the first perforated area is too large, which makes the valve cover top wall 42 unable to effectively block the direct impact of external liquid on the umbrella valve 30, thus causing external liquid to enter the box space 21.

[0047] In another embodiment, reference Figure 6 At least one first vent hole includes a plurality of first vent hole groups 422, the plurality of first vent hole groups 422 being arranged circumferentially spaced apart, and each first vent hole group 422 including a plurality of first vent holes 4221 arranged radially spaced apart.

[0048] By arranging multiple first exhaust port groups 422 at circumferential intervals, local accumulation of gas discharged from the chamber space 21 within the valve cover 40 can be avoided. The multiple first exhaust ports 4221 arranged radially at intervals can form a layered exhaust channel, effectively increasing the exhaust area and reducing flow resistance. Furthermore, it can enhance the structural stability of the valve cover top wall 42, reducing the weakening of the valve cover top wall 42 caused by the concentrated arrangement of multiple first exhaust ports 4221.

[0049] refer to Figure 7 The plurality of first exhaust holes 4221 include, in radial direction, a first exhaust hole to a first exhaust hole from the inside out, to the Nth first exhaust hole. The circumferential dimensions of the first exhaust hole to the Nth first exhaust hole can be L1, L2, and LN, respectively. The circumferential dimension of the (X+1)th first exhaust hole is greater than the circumferential dimension of the Xth first exhaust hole, N≥3, 1≤X≤N-1.

[0050] The first to Nth exhaust vents are arranged radially from the inside out, with their circumferential dimensions gradually increasing. This optimizes the airflow distribution at different radial positions, ensuring uniform exhaust. Furthermore, the larger outer exhaust vent reduces flow resistance, while the smaller inner exhaust vent helps ensure structural strength.

[0051] Continue to refer to Figure 7The radial dimension of the (X+1)th first exhaust hole is smaller than that of the Xth first exhaust hole, and the radial dimensions of the 1st to the Nth first exhaust holes can be d1, d2, and dN, respectively.

[0052] According to the above structure, the radial dimensions of the multiple first exhaust holes 4221 gradually decrease, which allows the first opening area near the outer edge of the valve cover top wall 42 to retain more solid structure, enhance the mechanical strength of the valve cover top wall 42, and avoid the valve cover top wall 42 from being too large and thus becoming weak.

[0053] refer to Figure 6 A spoke portion 423 is provided between any two adjacent first exhaust port groups 422. The inner end of the spoke portion 423 extends to the first unopened area 421 and its outer end extends to the outer edge of the valve cover top wall 42. The width of the spoke portion 423 gradually increases as it approaches its outer end.

[0054] By extending the inner end of the spoke portion 423 to the first unperforated area 421 and its outer end to the outer edge of the valve cover top wall, stress can be diffused from the first unperforated area 421 along the spoke portion 423 to the outer edge of the valve cover top wall 42, avoiding localized stress concentration. Furthermore, the width of the spoke portion 423 gradually increases towards its outer end, which helps to enhance the overall mechanical strength of the valve cover top wall 42.

[0055] In another embodiment, reference Figure 8 The orthographic projection of the umbrella edge 32 on the top wall 42 of the valve cover surrounds a plurality of first exhaust port groups 422. The radius of the orthographic projection of the umbrella edge 32 is R, and the distance between the orthographic projection of the umbrella edge 32 and the plurality of first exhaust port groups 422 is D3, in mm. 0.5% ≤ D3 / R ≤ 5%. Preferably, 1.5% ≤ D3 / R ≤ 4%. More preferably, 2.5% ≤ D3 / R ≤ 3%. Alternatively, the ratio D3 / R can also be 1%, 2%, 2.5%, 3.5%, or 4.5%.

[0056] Within the range of 0.5% ≤ D3 / R ≤ 5%, the valve cover top wall 42 can not only effectively block the direct impact of external liquid on the umbrella valve 30, but also has relatively small flow resistance when gas is discharged from the box space 21. If the ratio D3 / R is too small, that is, the distance between the orthographic projection of the umbrella edge 32 and the multiple first exhaust hole groups 422 is too small, the valve cover top wall 42 cannot effectively block the impact of external liquid on the umbrella valve 30. When external liquid impacts the umbrella valve 30, the external liquid easily enters the valve cover 40 through the first exhaust hole group 422 and directly impacts the umbrella valve 30, causing the umbrella edge 32 to deform, thereby allowing the external liquid to enter the box space 21. If the ratio D3 / R is too large, that is, the distance between the orthographic projection of the umbrella edge 32 and the multiple first exhaust port groups 422 is too large, then when the air pressure in the box space 21 exceeds the air pressure in the box space and the difference between the two is greater than the set pressure difference, the umbrella edge 32 of the umbrella body 31 will easily block the first exhaust port 4221 after it is deformed outward, increasing the flow resistance and reducing the exhaust efficiency.

[0057] In another embodiment, reference Figure 9 The gap between the top wall 42 of the valve cover and the top end 33 of the umbrella body.

[0058] By arranging the top wall 42 of the valve cover and the top 33 of the umbrella body at intervals, when the air pressure in the box space 21 exceeds the air pressure in the box space and the difference between the two is greater than the set pressure difference, it is possible to prevent the umbrella edge 32 of the umbrella body 31 from being deformed outward and blocking the first exhaust port 4221.

[0059] Further reference Figure 9 The distance between the top wall 42 of the valve cover and the top end 33 of the umbrella body is D2, and the axial dimension of the umbrella body 31 is H, in mm. 2% ≤ D2 / H ≤ 20%. Preferably, 5% ≤ D2 / H ≤ 17%. More preferably, 8% ≤ D2 / H ≤ 14%. Alternatively, the ratio D2 / H can also be 4%, 8%, 11%, 16%, or 18%.

[0060] If the ratio D2 / H is too small, meaning the distance between the top wall 42 of the valve cover and the top 33 of the umbrella body is too small, then when the air pressure in the space 21 inside the box exceeds the air pressure outside the box and the difference between the two is greater than the set pressure difference, the distance between the umbrella edge 32 and the top wall 42 of the valve cover will be too small after the umbrella edge 32 of the umbrella body 31 folds outward, resulting in a small gas flow channel and increased flow resistance. In addition, the outward deformation of the umbrella edge 32 may also block the first exhaust port 4221, causing gas to accumulate inside the valve cover 40 and preventing the gas in the space 21 inside the box from being discharged outside the valve cover 40. If the ratio D2 / H is too large, meaning the distance between the top wall 42 of the valve cover and the top 33 of the umbrella body is too large, it will reduce the space utilization rate inside the valve cover 40 and increase production costs. Therefore, within the range of 2% ≤ D2 / H ≤ 20%, the first exhaust port 4221 can be avoided from being blocked after the umbrella edge 32 is deformed outward, the flow resistance when the gas is discharged from the box space 21 can be reduced, the space utilization rate can be increased, and the production cost can be reduced.

[0061] In another embodiment, the top of the valve cover peripheral wall 41 defines a top opening.

[0062] By providing a top opening at the top of the valve cover peripheral wall 41, the flow resistance during gas discharge from the box space 21 can be reduced. When the gas pressure in the box space 21 exceeds the gas pressure in the box space and the difference between the two is greater than the set pressure difference, the umbrella edge 32 of the umbrella body 31 deforms outward, and the gas in the box space 21 can be discharged through the top opening.

[0063] In another embodiment, reference Figure 10 At least one second exhaust hole is provided on the peripheral wall 41 of the valve cover.

[0064] By providing at least one second exhaust hole on the peripheral wall of the valve cover, when the air pressure inside the box exceeds the air pressure outside the box and the difference between the two is greater than a set pressure difference, the umbrella edge of the umbrella body will fold outward and deform, and the gas inside the box will be discharged through at least one second exhaust hole. This can further reduce flow resistance and improve exhaust efficiency.

[0065] In this embodiment, the area of ​​the valve cover peripheral wall is S3, in mm. 2 The sum of the areas of at least one second exhaust port is S4, in mm. 2 The ratio S4 / S3 is 40% ≤ S4 / S3 ≤ 80%. Preferably, it is 45% ≤ S4 / S3 ≤ 75%. More preferably, it is 50% ≤ S4 / S3 ≤ 70%. Alternatively, the ratio S4 / S3 can also be 55%, 60%, or 65%.

[0066] If the ratio S4 / S3 is too small, meaning the sum of the areas of at least one second vent is too small, the flow resistance during gas discharge will be too high, leading to reduced exhaust efficiency. If the ratio S4 / S3 is too large, meaning the sum of the areas of at least one second vent is too large, the valve cover perimeter 41 will not effectively block the direct impact of external liquid on the umbrella valve 30. Because the sum of the areas of at least one second vent is too large, when external liquid impacts the umbrella valve 30, it easily impacts the umbrella edge 32 directly through at least one second vent, causing the umbrella edge 32 to deform outwards, thus allowing external liquid to enter the box space 21. Therefore, within the reasonable range of 40% ≤ S4 / S3 ≤ 80%, not only can the flow resistance be relatively small, but the direct impact of external liquid on the umbrella edge 32 can also be effectively avoided, preventing external liquid from entering the box space 21.

[0067] In another embodiment, reference Figure 10The valve cover peripheral wall 41 includes a second open area 411 and a second unopened area 412. The second open area 411 is closer to the top of the valve cover peripheral wall than the second unopened area 412, and at least one second vent hole is provided in the second open area 411. The second open area 411 is closer to the top wall 42 of the valve cover than the umbrella edge 31. The axial distance from the second open area 411 to the umbrella edge 32 is D4, and the axial dimension of the umbrella body 31 is H, in mm, with 20% ≤ D4 / H ≤ 80%. Preferably, 30% ≤ D4 / H ≤ 70%. More preferably, 40% ≤ D4 / H ≤ 60%. Alternatively, the ratio D4 / H can also be 25%, 35%, 45%, 50%, 55%, 65%, or 75%.

[0068] According to the above structure, when an external liquid impacts, the valve cover peripheral wall 41 can effectively block the external liquid from directly impacting the umbrella valve 30. At the same time, within the reasonable range of 20% ≤ D4 / H ≤ 80%, it is conducive to the discharge of gas and reduces flow resistance.

[0069] If the ratio D4 / H is too small, meaning the axial distance from the second opening area 411 to the umbrella edge 32 is too small (i.e., the area of ​​the second opening area 411 is too large), then the valve cover peripheral wall 41 cannot effectively block the direct impact of external liquid on the umbrella valve 30 during external liquid impact. This is because when the second opening area 411 is too large, external liquid easily enters the valve cover 40 through the second opening area 411, directly impacting the umbrella valve 30 and causing external liquid to enter the box space 21. If the ratio D4 / H is too large, meaning the axial distance from the second opening area 411 to the umbrella edge 32 is too large (i.e., the area of ​​the second opening area 411 is too small), then the flow resistance when gas is discharged from the box space 21 is relatively large, resulting in reduced exhaust efficiency.

[0070] Combination Figure 10 The distance from the valve cover peripheral wall 41 to the umbrella edge is D5, and the diameter of the umbrella edge 32 is D, in mm. 0.5% ≤ D5 / D ≤ 10%. Preferably, 2% ≤ D5 / D ≤ 8%. More preferably, 4% ≤ D5 / D ≤ 6%. Alternatively, the ratio D5 / D can also be 1%, 2.5%, 3%, 3.5%, 5%, 7%, or 9%.

[0071] If the ratio D5 / D is too small, meaning the distance D5 from the valve cover periphery 41 to the umbrella edge 32 is too small, then when the air pressure inside the box 21 exceeds the air pressure outside the box and the difference between the two is greater than the set pressure difference, the umbrella edge 32 of the umbrella body 31 will easily block the exhaust port when it deforms outward, increasing flow resistance and reducing exhaust efficiency. If the ratio D5 / D is too large, meaning the distance D5 from the valve cover periphery 41 to the umbrella edge 32 is too large, then the space utilization rate inside the valve cover 40 will be reduced, increasing production costs. By limiting the ratio D5 / D to 2% to 8%, the battery pack 100 will have a relatively high exhaust efficiency, while also increasing space utilization and reducing production costs.

[0072] <Example Electrical Equipment>

[0073] This disclosure also provides an electrical appliance 200, which may include the battery pack 100 described above.

[0074] 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.

[0075] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0076] In a non-restrictive example, refer to Figure 11 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.

[0077] 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.

[0078] 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.

[0079] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first vent and a second vent), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0080] 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.

[0081] 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 battery cells; The housing has an internal space for accommodating the plurality of battery cells; An umbrella valve is provided on the box and includes an umbrella body, wherein 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 umbrella edge 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. as well as A valve cover is provided on the box body and covers the umbrella body to block the direct impact of external liquid on the umbrella edge.

2. The battery pack according to claim 1, characterized in that, The valve cover includes a valve cover perimeter wall surrounding the umbrella body.

3. The battery pack according to claim 2, characterized in that, The valve cover also includes a valve cover top wall disposed on the top side of the umbrella body and connected to the top of the valve cover peripheral wall.

4. The battery pack according to claim 3, characterized in that, The valve cover top wall is provided with at least one first vent hole.

5. The battery pack according to claim 4, characterized in that, The area of ​​the top wall of the valve cover is S1, in mm. 2 The sum of the areas of the at least one first exhaust hole is S2, in mm. 2 30% ≤ S2 / S1 ≤ 95%.

6. The battery pack according to claim 4, characterized in that, The valve cover top wall includes a first unopened area and a first open area surrounding the first unopened area, and the at least one first exhaust hole is provided in the first open area.

7. The battery pack according to claim 6, characterized in that, The orthographic projection of the umbrella edge on the top wall of the valve cover surrounds the first unopened area. The radius of the orthographic projection of the umbrella edge is R, and the distance from the orthographic projection of the umbrella edge to the edge of the first unopened area is D1, in mm, where 20% ≤ D1 / R ≤ 80%.

8. The battery pack according to claim 6, characterized in that, The at least one first vent hole includes a plurality of first vent hole groups, which are arranged circumferentially at intervals, and each first vent hole group includes a plurality of first vent holes arranged radially at intervals.

9. The battery pack according to claim 8, characterized in that, The orthographic projection of the umbrella edge on the top wall of the valve cover surrounds the plurality of first exhaust hole groups. The radius of the orthographic projection of the umbrella edge is R, and the distance between the orthographic projection of the umbrella edge and the plurality of first exhaust hole groups is D3, in mm, 0.5% ≤ D3 / R ≤ 5%.

10. The battery pack according to claim 8, characterized in that, The plurality of first exhaust holes include, from the inside to the outside in the radial direction, the first exhaust hole to the Nth first exhaust hole, the (X+1)th first exhaust hole has a larger circumferential dimension than the Xth first exhaust hole, N≥3, 1≤X≤N-1.

11. The battery pack according to claim 10, characterized in that, The radial dimension of the (X+1)th first exhaust hole is smaller than the radial dimension of the Xth first exhaust hole.

12. The battery pack according to claim 11, characterized in that, A spoke portion is provided between any two adjacent first exhaust port groups. The inner end of the spoke portion extends to the first unopened area and its outer end extends to the outer edge of the valve cover top wall. The width of the spoke portion gradually increases as it approaches its outer end.

13. The battery pack according to claim 3, characterized in that, The top wall of the valve cover is spaced apart from the top of the umbrella body.

14. The battery pack according to claim 13, characterized in that, The distance between the top wall of the valve cover and the top of the umbrella body is D2, and the axial dimension of the umbrella body is H, in mm, where 2% ≤ D2 / H ≤ 20%.

15. The battery pack according to claim 2, characterized in that, The top of the valve cover peripheral wall defines a top opening.

16. The battery pack according to any one of claims 2 to 15, characterized in that, The valve cover has at least one second vent hole on its peripheral wall.

17. The battery pack according to claim 16, characterized in that, The area of ​​the valve cover peripheral wall is S3, in mm. 2 The sum of the areas of the at least one second exhaust port is S4, in mm. 2 40% ≤ S4 / S3 ≤ 80%.

18. The battery pack according to claim 16, characterized in that, The valve cover peripheral wall includes a second open area and a second unopened area. The second open area is closer to the top of the valve cover peripheral wall than the second unopened area. The at least one second vent is located in the second open area. The second open area is closer to the top wall of the valve cover than the umbrella edge. The axial distance from the second open area to the umbrella edge is D4, in mm. The axial dimension of the umbrella body is H, where 20% ≤ D4 / H ≤ 80%.

19. The battery pack according to any one of claims 2 to 15, characterized in that, The distance from the valve cover peripheral wall to the umbrella edge is D5, and the diameter of the umbrella edge is D, in mm, where 0.5% ≤ D5 / D ≤ 10%.

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

Images