Battery pack and electric device

Abstract

The embodiment of the application relates to the battery field, and provides a battery pack and an electric equipment, the battery pack comprises a box body, the box body comprises a frame, a bottom guard plate and a fixing piece, the fixing piece is configured to penetrate the bottom guard plate and the frame to fixedly connect the frame and the bottom guard plate; wherein a sealing piece is arranged between the frame and the bottom guard plate, the distance from the central axis of the fixing piece to the outside of the frame is U mm, the distance from the central axis of the fixing piece to the inside of the frame is V mm, 0.7 <= U / V <= 0.9, and the distance between the outer edge of the sealing piece and the outer edge of the bottom guard plate is L mm <= 30 mm; the position of the fixing piece can be effectively optimized, the fixing force is more evenly distributed on the sealing piece, local deformation or gaps of the sealing piece caused by excessive inward or outward deviation of the fixing piece are avoided, the sealing piece is ensured to be close to the frame edge, an effective barrier is formed, the sealing performance of the sealing piece is obviously improved, and the penetration of salt mist from the sealing piece into the battery pack of the embodiment of the application is effectively prevented.

Description

Technical Field

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

[0002] Battery packs store electrical energy and discharge it, playing a significant role in various aspects of modern life. In high-salt environments such as seasides, salt lakes, and saline-alkali lands, the air typically contains high levels of sodium chloride and is highly humid due to water evaporation and wind action; this environment is known as salt fog. Because battery packs contain various metal fasteners, severe corrosion of these fasteners can significantly reduce their structural strength, affecting the battery pack's structural stability. Utility Model Content

[0003] In view of this, the embodiments of this application aim to provide a battery pack and electrical equipment to solve the technical problem in the prior art that the battery casing and related mounting components are easily corroded by salt spray, resulting in a significant reduction in structural strength and affecting normal use.

[0004] In view of this, the embodiments of this application aim to provide a battery pack and electrical equipment to solve the technical problem in the prior art that the battery casing and related mounting components are easily corroded by salt spray, resulting in a significant reduction in structural strength and affecting normal use.

[0005] The first aspect of this application provides a battery pack, comprising: A sealing element is provided between the frame and the bottom protective plate. The distance from the central axis of the fixing element to the outer side of the frame is U mm, and the distance from the central axis of the fixing element to the inner side of the frame is V mm. U / V satisfies 0.7≤U / V≤0.9. The distance between the outer edge of the sealing element and the outer edge of the bottom protective plate is L mm, and L mm satisfies L mm ≤30 mm.

[0006] Another aspect of this application provides an electrical device including the aforementioned battery pack.

[0007] In the battery pack of the embodiments of this application, the position of the fixing member can be effectively optimized, so that the fixing force is more evenly distributed on the seal, avoiding local deformation or gaps in the seal due to excessive inward or outward deviation of the fixing member. At the same time, the distance between the outer edge of the seal and the outer edge of the bottom guard plate is limited to within 30mm, ensuring that the seal is close to the edge of the frame, forming an effective barrier, significantly improving the sealing performance of the seal, and effectively preventing salt spray from seeping into the battery pack of this application embodiment from the seal. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this application 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 perspective view of the battery pack according to an embodiment of this application.

[0012] Figure 2 This is a partial cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0013] Figure 3 This is a partial structural diagram of the battery pack according to an embodiment of this application.

[0014] Figure 4 This is a partial cross-sectional schematic diagram of another battery pack according to an embodiment of this application.

[0015] Figure 5 This is a partial structural schematic diagram of another battery pack according to an embodiment of this application.

[0016] Figure 6 This is a perspective view of the bottom protective plate of the battery pack according to an embodiment of this application.

[0017] Figure 7 This is a partial cross-sectional schematic diagram of another battery pack according to an embodiment of this application.

[0018] Figure 8 This is a partial structural diagram of another battery pack according to an embodiment of this application.

[0019] Attached image labels: 1. Frame; 2. Bottom plate; 21. Edge area; 22. Recessed area; 3. Fixing component; 4. Sealing component; 41. Outer sealing ring; 42. Inner sealing ring; 43. Opening; 5. Heat exchange plate; 6. Buffer section. Detailed Implementation

[0020] 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.

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] like Figures 1 to 8 As shown, this application provides a battery pack, which includes at least a housing and a battery pack disposed within the housing. The housing includes a bottom protective plate 2 and a frame 1 fixed to the outer periphery of the bottom protective plate 2, and the bottom protective plate 2 and the frame 1 form a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0023] Specifically, a battery pack can be a complete functional unit that directly outputs electrical energy, consisting of a battery pack (BMS), a battery management system, a thermal management system, an electrical connection system (including high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components, all composed of multiple battery cells connected in series and / or parallel. These components are housed within a casing and sealed with a cover. As a rechargeable battery, the battery pack can serve as a power source for electrical equipment such as new energy vehicles. Specifically, the aforementioned casing can be a closed or semi-closed structure made of materials such as metal or plastic, serving as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The casing provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the casing, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors.

[0024] The enclosure may include a lower enclosure and an upper enclosure. The lower enclosure includes a bottom protective plate 2 and a frame 1 connected to and surrounding the bottom protective plate 2. The upper enclosure is connected to the frame 1 and has a top plate opposite to the bottom protective plate 2. The upper and lower enclosures together form a receiving cavity. The frame 1 and the bottom protective plate 2 can be integrally formed or processed separately and then fixedly connected. Specifically, the frame 1 and the bottom protective plate 2 are fixedly connected by welding, riveting, screwing, etc. When the enclosure is a cube, the frame 1 of the lower enclosure generally has four side plates, which surround the perimeter of the bottom protective plate 2. In other embodiments, the shape of the enclosure can also be a cylinder or other shapes. The frame 1 mainly serves to support, protect, and connect. The frame 1 can be formed by splicing multiple beams together. The frame 1 can be rectangular, circular, polygonal, etc., without limitation. The frame 1 can be made of various materials, such as aluminum alloy, copper alloy, steel, plastic, etc. The beams of the frame 1 can be solid structures or contain cavities. The bottom protective plate 2 is the main load-bearing component of the battery pack, used to support and fix the battery pack, battery management system, cooling system, and other components inside the battery pack. The bottom protective plate 2 is located at the bottom of the casing frame 1 and can be fixed to the bottom of the casing frame 1 by welding, riveting, screwing, or other methods. The bottom protective plate 2 can be rectangular, circular, polygonal, or a plate-like structure; its specific shape is not limited, and its size is determined by the number and size of the battery cells housed in the battery pack. The casing can be cast from materials such as steel or aluminum alloy, or made from lightweight materials such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials.

[0025] Specifically, the battery pack is housed within the receiving cavity. Specifically, multiple battery cells with similar capacity and internal resistance can be connected in series or parallel to form a battery pack. It is understood that the battery cells in this embodiment can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and are not limited thereto. The battery cells can store chemical energy and controllably convert this chemical energy into electrical energy. For recyclable battery cells, the active materials can be activated by charging after discharge for continued use.

[0026] like Figure 1 and Figure 2 As shown, the battery pack in this embodiment further includes a fixing member 3. The fixing member 3 is configured to penetrate the bottom protective plate 2 and the frame 1 to fix the frame 1 to the bottom protective plate 2. That is, the battery pack in this embodiment can use the fixing member 3 penetrating the bottom protective plate 2 and the frame 1 to fix the frame 1 to the bottom protective plate 2, thereby fixing the box into one piece and protecting the internal battery pack and other components. It is understood that the fixing member 3 can be a screw, rivet, or other component with a fixing function, and is not limited here.

[0027] like Figure 2 and Figure 3 As shown, in the battery pack of this embodiment, a sealing member 4 is provided between the frame 1 and the bottom protective plate 2. The distance from the central axis of the fixing member to the outer side of the frame 1 is U mm, and the distance from the central axis of the fixing member to the inner side of the frame 1 is V mm. U / V satisfies 0.7≤U / V≤0.9. The distance between the outer edge of the sealing member 4 and the outer edge of the bottom protective plate 2 is L mm, and L mm satisfies L mm ≤30 mm. It can be understood that the outer edge of the sealing member 4 is the outermost edge of the entire sealing member 4.

[0028] In the battery pack of the embodiments of this application, the position of the fixing member 3 can be effectively optimized, so that the fixing force is more evenly distributed on the sealing member 4, avoiding local deformation or gaps in the sealing member 4 due to the fixing member 3 being too inward or outward. At the same time, the distance between the outer edge of the sealing member 4 and the outer edge of the bottom protective plate 2 is limited to within 30mm, ensuring that the sealing member 4 is close to the edge of the frame 1, forming an effective barrier, significantly improving the sealing performance of the sealing member 4, and effectively preventing salt spray from seeping into the battery pack of this application embodiment from the sealing member 4.

[0029] like Figure 2 and Figure 3 As shown, in one embodiment of this application, the orthographic projection of the fastener 3 on the bottom cover plate 2 is configured to be located inside the orthographic projection of the outer contour of the seal 4 on the bottom cover plate 2.

[0030] In the battery pack of this embodiment, by providing a sealing element 4 between the frame 1 and the bottom protective plate 2, the sealing element 4 can effectively seal the gap between the frame 1 and the bottom protective plate 2. Furthermore, since the orthographic projection of the fixing element 3 on the bottom protective plate 2 is located inside the orthographic projection of the outer contour of the sealing element 4 on the bottom protective plate 2, the sealing element 4, while sealing the gap between the frame 1 and the bottom protective plate 2, can also isolate the fixing element 3 from the outside environment, preventing contact between outside air and the fixing element 3. When the battery pack of this embodiment is applied to a high-salt, high-humidity environment with salt spray, it can effectively prevent the high-salt, high-humidity salt spray from entering the area enclosed by the sealing element 4, effectively preventing the salt spray from corroding the fixing element 3 between the frame 1 and the bottom protective plate 2 and other structures inside the battery pack. This effectively ensures the structural strength of the fixing element 3, thereby ensuring the stability of the fixing structure of the battery pack of this embodiment, and also preventing other structures inside the battery pack from being corroded by salt spray.

[0031] In one embodiment of this application, the seal 4 is a sealing rubber or sealant. When the seal 4 is a sealing rubber or sealant, the seal 4 has a certain elasticity, which can effectively seal the gap between the sealing frame 1 and the bottom protective plate 2, preventing high-salt and high-humidity salt spray from entering the interior of the seal 4, thereby effectively preventing salt spray from corroding the fixing component 3 and other structures inside the battery pack box. In addition, the seal 4 itself also has good anti-salt spray performance and is not prone to property changes in the salt spray environment, which could lead to seal failure.

[0032] like Figure 2 As shown, in one embodiment of this application, the thickness of the seal 4 is G mm, where G mm satisfies 1 mm ≤ G mm ≤ 5 mm.

[0033] When the thickness G mm of the seal 4 is less than 1 mm, the sealing effect of the seal 4 is poor and it is easy to have a poor seal. When the thickness G mm of the seal 4 is greater than 5 mm, the seal 4 will cause the distance between the frame 1 and the bottom protective plate 2 to be too large, thereby affecting the energy density of the battery pack in this embodiment of the application and increasing the material cost required for the seal 4.

[0034] Therefore, when the thickness G mm of the seal 4 satisfies 1 mm ≤ G mm ≤ 5 mm, not only can the sealing effect of the seal 4 be effectively improved, but the distance between the frame 1 and the bottom protective plate 2 can also be effectively shortened, thereby increasing the energy density of the battery pack in this embodiment and reducing the material cost required for the seal 4. In specific embodiments, the thickness G mm of the seal 4 can be selected from specific values ​​such as 1 mm, 1.3 mm, 1.6 mm, 2 mm, 2.5 mm, 3 mm, 3.4 mm, 3.9 mm, 4.5 mm, and 5 mm, and is not limited here.

[0035] Specifically, such as Figure 3 As shown, in one embodiment of this application, the seal 4 includes at least one outer sealing ring 41, and the orthographic projection of the fixing member 3 on the bottom protective plate 2 is configured to be completely located inside the orthographic projection of the outer sealing ring 41 on the bottom protective plate 2. That is, as Figure 3 As shown, the battery pack of this embodiment is provided with at least one outer sealing ring 41. The orthographic projection of the fixing member 3 on the bottom protective plate 2 is completely inside the orthographic projection of the outer sealing ring 41 on the bottom protective plate 2, that is, the outer sealing ring 41 is completely outside the fixing member 3. This allows the outer sealing ring 41 to seal the gap between the frame 1 and the bottom protective plate 2 while blocking the fixing member 3 located inside it from the outside world, preventing the outside air from contacting the fixing member 3, effectively preventing salt spray from corroding the fixing member 3, and thus effectively ensuring the structural strength of the fixing member 3.

[0036] Furthermore, in one embodiment of this application, the minimum distance between the outer sealing ring 41 and the fixing member 3 is A mm, where A mm satisfies A mm ≤ 5 mm.

[0037] When the minimum distance A mm between the outer sealing ring 41 and the fixing member 3 is greater than 5 mm, it will affect the maximum arrangeable width of the outer sealing ring 41, thus affecting the sealing effect of the outer sealing ring 41. Therefore, when the minimum distance A mm between the outer sealing ring 41 and the fixing member 3 satisfies A mm ≤ 5 mm, the sealing effect of the outer sealing ring 41 can be effectively guaranteed. In specific embodiments, the minimum distance A mm between the outer sealing ring 41 and the fixing member 3 can be selected from specific values ​​such as 1 mm, 1.4 mm, 1.9 mm, 2.3 mm, 2.8 mm, 3.2 mm, 3.7 mm, 4.1 mm, 4.6 mm, and 5 mm, and is not limited here.

[0038] like Figure 3 As shown, in one embodiment of this application, the width of the outer sealing ring 41 is D mm, where D mm satisfies 4 mm ≤ D mm ≤ 10 mm.

[0039] When the width D mm of the outer sealing ring 41 is less than 4 mm, it is difficult to guarantee the sealing effect of the outer sealing ring 41, and poor sealing is likely to occur. When the width D mm of the outer sealing ring 41 is greater than 5 mm, the width of the outer sealing ring 41 is too large, and the width of the frame 1 needs to be increased at the same time, thereby increasing the volume of the battery pack in this embodiment, affecting the energy density of the battery pack in this embodiment, and also increasing the material cost required for the outer sealing ring 41.

[0040] Therefore, when the width D mm of the outer sealing ring 41 satisfies 4 mm ≤ D mm ≤ 10 mm, not only can the sealing effect of the outer sealing ring 41 be guaranteed, but the required width of the frame 1 can also be reduced, the energy density of the battery pack can be increased, and the material cost required for the outer sealing ring 41 can be reduced. In specific embodiments, the width D mm of the outer sealing ring 41 can be selected from specific values ​​such as 4 mm, 4.5 mm, 5.2 mm, 6 mm, 6.8 mm, 7.5 mm, 8.2 mm, 8.8 mm, 9.5 mm, and 10 mm, and is not limited here.

[0041] Furthermore, in one embodiment of this application, the sealing element 4 includes at least two outer sealing rings 41, and the orthographic projections of each outer sealing ring 41 on the bottom protective plate 2 do not overlap. Since the sealing element 4 includes at least two outer sealing rings 41, and each outer sealing ring 41 does not overlap, they can seal the gap between the frame 1 and the bottom protective plate 2, blocking the fixing element 3 from the outside world, preventing outside air from contacting the fixing element 3, and further preventing high-salt and high-humidity salt spray from entering the area enclosed by the sealing element 4, preventing salt spray from corroding the fixing element 3 between the frame 1 and the bottom protective plate 2 and other structures inside the battery pack box, thus ensuring the structural strength of the fixing element 3.

[0042] like Figure 4 and Figure 5 As shown, in one embodiment of this application, the seal 4 further includes at least one inner sealing ring 42, and the orthographic projection of the fastener 3 on the bottom cover plate 2 is configured to be completely outside the orthographic projection of the inner sealing ring 42 on the bottom cover plate 2.

[0043] By providing an inner sealing ring 42 in the battery pack of this application embodiment, the inner sealing ring 42 can not only seal the gap between the frame 1 and the bottom protective plate 2, but also isolate other structures inside the battery pack box from the outside world, preventing high-salt and high-humidity salt spray from entering the area enclosed by the inner sealing ring 42, and effectively preventing salt spray from corroding other structures inside the battery pack box.

[0044] Furthermore, such as Figure 4 and Figure 5 As shown, in one embodiment of this application, the width of the inner sealing ring 42 is E mm, where E mm satisfies 5 mm ≤ E mm ≤ 15 mm.

[0045] When the width E mm of the inner sealing ring 42 is less than 5 mm, it is difficult to guarantee the sealing effect of the inner sealing ring 42, and poor sealing is likely to occur. When the width E mm of the inner sealing ring 42 is greater than 5 mm, the width of the inner sealing ring 42 is too large, and the width of the frame 1 needs to be increased at the same time, thereby increasing the volume of the battery pack in this embodiment, affecting the energy density of the battery pack in this embodiment, and also increasing the material cost required for the inner sealing ring 42. Therefore, when the width E mm of the inner sealing ring 42 satisfies 5 mm ≤ E mm ≤ 15 mm, not only can the sealing effect of the inner sealing ring 42 be guaranteed, but the required width of the frame 1 can also be reduced, the energy density of the battery pack can be increased, and the material cost required for the inner sealing ring 42 can be reduced. In specific embodiments, the width E mm of the inner sealing ring 42 can be selected from specific values ​​such as 5 mm, 5.8 mm, 7 mm, 8.2 mm, 9.5 mm, 11 mm, 12.2 mm, 13.5 mm, 14.8 mm, 15 mm, etc., and is not limited here.

[0046] Furthermore, in one embodiment of this application, the sealing element 4 includes at least two inner sealing rings 42, and the orthographic projections of each inner sealing ring 42 on the bottom protective plate 2 do not overlap. Since the sealing element 4 includes at least two inner sealing rings 42, and each inner sealing ring 42 does not overlap, both can seal the gap between the frame 1 and the bottom protective plate 2, and isolate other structures inside the battery pack from the outside environment. This further prevents high-salt, high-humidity salt spray from entering the area enclosed by the inner sealing rings 42, and prevents salt spray from corroding other structures inside the battery pack.

[0047] like Figure 6 As shown, in one embodiment of this application, the bottom protective plate 2 includes an edge area 21 and a recessed area 22 surrounded by the edge area 21. That is, the recessed area 22 is located in the middle area of ​​the bottom protective plate 2 and protrudes downward relative to the edge area 21, so that the bottom protective plate 2 has a certain buffer space. When the battery pack is impacted from the bottom, the bottom protective plate 2 has a certain buffer space, thereby reducing the impact on the battery pack.

[0048] like Figure 4 As shown, in one embodiment of this application, the sealing member 4 and the fixing member 3 are both disposed in the corresponding area of ​​the edge area 21. In this way, the gap between the bottom guard plate 2 and the frame 1 in the corresponding area of ​​the edge area 21 is small, which makes it easy for the fixing member 3 to penetrate the bottom guard plate 2 and the frame 1 to fix the frame 1 to the bottom guard plate 2. It also makes it easy for the sealing member 4 to effectively seal the gap between the frame 1 and the bottom guard plate 2.

[0049] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the distance between the inner edge of the inner sealing ring 42 and the outer edge of the sunken area 22 is F mm, where F mm satisfies 10 mm ≤ F mm ≤ 50 mm.

[0050] When the distance F mm between the inner edge of the inner sealing ring 42 and the outer edge of the recessed area 22 is less than 10 mm, during the assembly process, if the inner sealing ring 42 is partially misaligned, it is easy to enter the corresponding area of ​​the recessed area 22, which makes it difficult for the inner sealing ring 42 to fit tightly with the frame 1 and the bottom guard plate 2, thus affecting the sealing effect of the inner sealing ring 42 on the gap between the frame 1 and the bottom guard plate 2. When the distance F mm between the inner edge of the inner sealing ring 42 and the outer edge of the recessed area 22 is greater than 50 mm, it will also affect the maximum arrangeable width of the outer sealing ring 41, thus affecting the sealing effect of the outer sealing ring 41.

[0051] Therefore, when the distance F mm between the inner edge of the inner sealing ring 42 and the outer edge of the recessed area 22 satisfies 10 mm ≤ F mm ≤ 50 mm, it not only minimizes the possibility of the inner sealing ring 42 entering the corresponding area of ​​the recessed area 22 during assembly, thus ensuring a tight fit between the inner sealing ring 42 and the frame 1 and the bottom protective plate 2, guaranteeing the sealing effect at various positions of the gap between the frame 1 and the bottom protective plate 2, but also effectively ensures that the width of the inner sealing ring 42 meets the requirements, thereby improving the sealing effect of the inner sealing ring 42. In a specific embodiment, the distance F mm between the inner edge of the inner sealing ring 42 and the outer edge of the recessed area 22 can be selected from specific values ​​such as 10 mm, 11.5 mm, 14 mm, 18 mm, 23 mm, 28.5 mm, 34 mm, 39.5 mm, 44.5 mm, and 50 mm, and is not limited here.

[0052] like Figure 1 and Figure 7 As shown, in another embodiment of this application, multiple fasteners 3 are provided; multiple fasteners 3 all penetrate the bottom cover plate 2 and the frame 1 to fix the frame 1 to the bottom cover plate 2; the sealing member 4 is provided with an opening 43, and the orthographic projection of the fastener 3 on the bottom cover plate 2 is configured to be located inside the orthographic projection of the opening 43 on the bottom cover plate 2.

[0053] That is, the fastener 3 can sequentially penetrate the bottom protective plate 2, the seal 4, and the frame 1 to fix the frame 1 to the bottom protective plate 2. The fastener 3 is located inside the opening 43, and the seal 4 can surround each fastener 3. Thus, while sealing the gap between the frame 1 and the bottom protective plate 2, the seal 4 can also isolate the fastener 3 from the outside environment, preventing outside air from contacting the fastener 3 and preventing high-salt and high-humidity salt spray from entering the opening 43 on the seal 4. This effectively prevents salt spray from corroding the fastener 3, thereby effectively ensuring the structural strength of the fastener 3. It is understandable that, as Figure 8 As shown, each opening 43 may contain only one fastener 3 or two or more fasteners 3, which is not limited here.

[0054] Furthermore, such as Figure 8 As shown, in one embodiment of this application, the distance between the fixing member 3 and the inner wall of the opening portion 43 is J mm, where J mm satisfies 3 mm ≤ J mm ≤ 10 mm.

[0055] When the distance J mm between the fixing member 3 and the inner wall of the opening portion 43 is less than 3 mm, during the assembly of the sealing member 4 and the fixing member 3, if the sealing member 4 is partially misaligned, the inner walls of the opening portion 43 of the sealing member 4 and the fixing member 3 are likely to overlap, thus hindering the normal installation of the fixing member 3. When the distance J mm between the fixing member 3 and the inner wall of the opening portion 43 is greater than 10 mm, the width between the outer edge of the fixing member 3 and the inner wall of the opening portion 43 will decrease, thus affecting the sealing effect of the sealing member 4. Therefore, when the distance J mm between the fixing member 3 and the inner wall of the opening portion 43 satisfies 3 mm ≤ J mm ≤ 10 mm, even if the sealing member 4 is partially misaligned relative to its installation position, it is not easy for it to overlap with the fixing member 3, thus effectively preventing the sealing member 4 from blocking the normal installation of the fixing member 3 and effectively ensuring the sealing effect of the sealing member 4. In a specific embodiment, the distance J mm between the fixing member 3 and the inner wall of the opening portion 43 can be selected from specific values ​​such as 3mm, 3.2mm, 3.8mm, 4.5mm, 5.3mm, 6.4mm, 7.2mm, 8.1mm, 9.3mm, 10mm, etc., and is not limited here.

[0056] like Figure 8 As shown, in one embodiment of this application, the overall width of the seal 4 is K mm, where K mm satisfies 22 mm ≤ K mm ≤ 45 mm.

[0057] When the overall width K mm of the seal 4 is less than 22 mm, it is difficult to guarantee the sealing effect of the seal 4, and poor sealing is likely to occur; when the overall width K mm of the seal 4 is greater than 45 mm, the overall width of the seal 4 is too large, and the overall width of the frame 1 needs to be increased at the same time, thereby increasing the volume of the battery pack in this embodiment, affecting the energy density of the battery pack in this embodiment, and also increasing the material cost required for the seal 4.

[0058] Therefore, when the overall width K mm of the seal 4 satisfies 22 mm ≤ K mm ≤ 45 mm, not only can the sealing effect of the seal 4 be guaranteed, but the required overall width of the frame 1 can also be reduced, increasing the energy density of the battery pack and reducing the material cost required for the seal 4. In specific embodiments, the overall width K mm of the seal 4 can be selected from specific values ​​such as 22 mm, 24 mm, 26.5 mm, 29.5 mm, 32.5 mm, 35 mm, 38 mm, 40.5 mm, 43 mm, and 45 mm, and is not limited here.

[0059] like Figure 7As shown, in one embodiment of this application, when the bottom guard plate 2 includes an edge area 21 and a recessed area 22 surrounded by the edge area 21, the distance between the inner edge of the seal 4 and the outer edge of the recessed area 22 is N mm, where N mm satisfies 10 mm ≤ N mm ≤ 50 mm.

[0060] When the distance N mm between the inner edge of the seal 4 and the outer edge of the recessed area 22 is less than 10 mm, during the assembly process, if the seal 4 is partially misaligned, it is easy for it to partially enter the corresponding area of ​​the recessed area 22. This makes it difficult for part of the seal 4 to fit tightly with the frame 1 and the bottom guard plate 2, thus affecting the sealing effect of the seal 4 on the gap between the frame 1 and the bottom guard plate 2. When the distance N mm between the inner edge of the seal 4 and the outer edge of the recessed area 22 is greater than 50 mm, it will also affect the maximum arrangeable width of the seal 4, thus affecting the sealing effect of the seal 4.

[0061] Therefore, when the distance N mm between the inner edge of the seal 4 and the outer edge of the recessed area 22 satisfies 10 mm ≤ N mm ≤ 50 mm, it can not only minimize the possibility of the seal 4 partially entering the corresponding area of ​​the recessed area 22 during assembly, thus ensuring a tight fit between the seal 4 and the frame 1 and the bottom guard plate 2, guaranteeing the sealing effect at all positions of the gap between the frame 1 and the bottom guard plate 2, but also effectively ensure that the width of the seal 4 meets the requirements, thereby improving the sealing effect of the seal 4. In a specific embodiment, the distance N mm between the inner edge of the seal 4 and the outer edge of the recessed area 22 can be selected from specific values ​​such as 10 mm, 12.5 mm, 16 mm, 20.5 mm, 26 mm, 30 mm, 35 mm, 38.5 mm, 43 mm, 50 mm, etc., and is not limited here.

[0062] like Figure 2 As shown, the battery pack in this embodiment of the application also includes a heat exchange plate 5 and a battery pack; the battery pack is fixedly disposed above the heat exchange plate 5, and the heat exchange plate 5 is configured to exchange heat with the battery pack; the fastener 3 is configured to penetrate the bottom guard plate 2, the heat exchange plate 5 and the frame 1 to fix the frame 1 and the bottom guard plate 2, and the seal 4 is disposed between the heat exchange plate 5 and the bottom guard plate 2.

[0063] Specifically, the heat exchange plate 5 is provided with heat exchange fluid. During the operation of the battery pack in this embodiment, the heat exchange fluid in the heat exchange plate 5 can exchange heat with the battery pack during the movement, ensuring that the battery pack operates within a suitable temperature range and improving the working stability and safety of the battery pack.

[0064] Since the fastener 3 passes through the bottom guard plate 2, the heat exchange plate 5 and the frame 1, it can fix the frame 1, the heat exchange plate 5 and the bottom guard plate 2 together. The sealing element 4 is set between the heat exchange plate 5 and the bottom guard plate 2, so as to effectively reduce the gap between the heat exchange plate 5 and the bottom guard plate 2. It can not only effectively protect the fastener 3, but also prevent high salt and high humidity salt spray from entering the area between the heat exchange plate 5 and the bottom guard plate 2.

[0065] like Figure 2 As shown, in one embodiment of this application, when the bottom protective plate 2 includes an edge region 21 and a recessed region 22 surrounded by the edge region 21, a buffer portion 6 is provided between the bottom wall of the recessed region 22 and the heat exchange plate 5. By providing a buffer portion 6 between the bottom wall of the recessed region 22 and the heat exchange plate 5, when the battery pack is subjected to a bottom impact, the buffer portion 6 can further alleviate the impact on the battery pack and reduce the deformation of the bottom protective plate 2 after the impact.

[0066] This application also provides an electrical device that includes at least one of the aforementioned battery packs. It is understood that this electrical device can be any type of electrical device, such as an electric vehicle, an appliance with a battery pack, or an energy storage device, and is not limited thereto.

[0067] 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 application will not describe the various possible combinations separately.

[0068] 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.

[0069] It should be understood that while terms such as "first" or "second" may be used in this application to describe various elements, these elements are not limited by these terms; these terms are merely used to distinguish one element from another. The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms "a," "the," and "the" as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0070] In this document, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. Terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0071] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0072] The above are merely specific embodiments of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, Includes a housing, the housing including a frame (1), a bottom guard plate (2) and a fastener (3), the fastener (3) being configured to penetrate the bottom guard plate (2) and the frame (1) to fix the frame (1) to the bottom guard plate (2); Wherein, a sealing element (4) is provided between the frame (1) and the bottom guard plate (2), the distance from the central axis of the fixing element to the outside of the frame (1) is U mm, the distance from the central axis of the fixing element to the inside of the frame (1) is V mm, U / V satisfies 0.7≤U / V≤0.9, the distance between the outer edge of the sealing element (4) and the outer edge of the bottom guard plate (2) is L mm, L mm satisfies L mm ≤30mm.

2. The battery pack according to claim 1, characterized in that, The orthographic projection of the fastener (3) on the bottom guard plate (2) is configured such that the outer contour of the seal (4) is inside the orthographic projection of the bottom guard plate (2).

3. The battery pack according to claim 2, characterized in that, The seal (4) includes at least one outer sealing ring (41), and the orthographic projection of the fastener (3) on the bottom guard plate (2) is configured to be completely inside the orthographic projection of the outer sealing ring (41) on the bottom guard plate (2).

4. The battery pack according to claim 3, characterized in that, The minimum distance between the outer sealing ring (41) and the fixing member (3) is A mm, and A mm satisfies A mm ≤ 5 mm.

5. The battery pack according to claim 3, characterized in that, The width of the outer sealing ring (41) is D mm, and D mm satisfies 4 mm ≤ D mm ≤ 10 mm.

6. The battery pack according to claim 1, characterized in that, The seal (4) further includes at least one inner sealing ring (42), and the orthographic projection of the fastener (3) on the bottom guard plate (2) is configured to be completely outside the orthographic projection of the inner sealing ring (42) on the bottom guard plate (2).

7. The battery pack according to claim 6, characterized in that, The width of the inner sealing ring (42) is E mm, and E mm satisfies 5 mm ≤ E mm ≤ 15 mm.

8. The battery pack according to claim 6, characterized in that, The bottom guard plate (2) includes an edge area (21) and a recessed area (22) surrounded by the edge area (21); the sealing member (4) and the fixing member (3) are both disposed in the corresponding areas of the edge area (21); The distance between the inner edge of the inner sealing ring (42) and the outer edge of the sinking area (22) is F mm, where F mm satisfies 10 mm ≤ F mm ≤ 50 mm.

9. The battery pack according to claim 6, characterized in that, The seal (4) includes at least two inner sealing rings (42), and the orthographic projections of each inner sealing ring (42) on the bottom guard plate (2) do not overlap.

10. The battery pack according to claim 3, characterized in that, The seal (4) includes at least two outer sealing rings (41), and the orthographic projections of each outer sealing ring (41) on the bottom guard plate (2) do not overlap.

11. The battery pack according to claim 1, characterized in that, Multiple fasteners (3) are provided; all of the multiple fasteners (3) penetrate the bottom guard plate (2) and the frame (1) to fix the frame (1) and the bottom guard plate (2) in a fixed connection. The sealing element (4) is provided with an opening (43), and the orthographic projection of the fixing element (3) on the bottom guard plate (2) is configured to be located inside the orthographic projection of the opening (43) on the bottom guard plate (2).

12. The battery pack according to claim 11, characterized in that, The distance between the fastener (3) and the inner wall of the opening (43) is J mm, where J mm satisfies 3 mm ≤ J mm ≤ 10 mm.

13. The battery pack according to claim 11, characterized in that, The overall width of the seal (4) is Kmm, where Kmm satisfies 22 mm ≤ Kmm ≤ 45 mm; And / or, the thickness of the seal (4) is G mm, where G mm satisfies 1 mm ≤ G mm ≤ 5 mm.

14. The battery pack according to claim 11, characterized in that, The bottom guard plate (2) includes an edge area (21) and a recessed area (22) surrounded by the edge area (21); the distance between the inner edge of the seal (4) and the outer edge of the recessed area (22) is N mm, where N mm satisfies 10 mm ≤ N mm ≤ 50 mm.

15. The battery pack according to any one of claims 1 to 14, characterized in that, It also includes a heat exchange plate (5) and a battery pack; the battery pack is fixedly disposed above the heat exchange plate (5), and the heat exchange plate (5) is configured to exchange heat with the battery pack; The fastener (3) is configured to penetrate the bottom guard plate (2), the heat exchange plate (5) and the frame (1) to fix the frame (1) to the bottom guard plate (2), and the seal (4) is disposed between the heat exchange plate (5) and the bottom guard plate (2).

16. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 15.

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