Battery pack and electric device

Abstract

The application relates to the technical field of batteries, and provides a battery pack and an electric equipment. The battery pack comprises a battery array, a flow channel plate and a pack body. The battery array comprises at least one battery column, the battery column comprises a plurality of single batteries arranged along a first direction, the bottom surface of the single battery is provided with a pressure relief valve, the flow channel plate is arranged at the bottom of the battery array, the flow channel plate is provided with a through hole, at least one flow channel is arranged in the flow channel plate, the flow channel extends along the first direction, and the flow channel protrudes downward relative to the flow channel plate, the pack body is provided with a bottom plate, and an exhaust space is formed between the bottom plate and the flow channel plate. The bottom surface of the flow channel plate is provided with a pressure relief flow guide piece, the pressure relief flow guide piece is arranged at the position adjacent to the corresponding pressure relief valve at the bottom of the flow channel plate, the pressure relief flow guide piece has an air outlet facing the flow channel, the pressure relief flow guide piece enables the fluid sprayed by the pressure relief valve to flow out from below the flow channel in the direction of the corresponding flow channel, the height of the flow channel is E, the height of the air outlet is F, and E / F satisfies 0.4<=E / F<=0.8.

Description

Technical Field

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

[0002] In existing technologies, to achieve thermoelectric separation of the battery, the pressure relief valve is placed at the bottom of the battery, thus occupying the bottom space of the individual cell. When the flow channel plate is also placed at the bottom of the battery array, it not only easily affects the heat exchange between the individual cell and the flow channel plate, preventing the individual cell from operating within the appropriate temperature range and affecting the performance of the battery pack, but also the flow channel plate can easily affect the venting process of the fluid ejected from the pressure relief valve. This causes the high-temperature, high-pressure fluid ejected from the pressure relief valve to remain in the venting space for too long. The high-temperature, high-pressure fluid has a significant impact on other individual cells, potentially leading to thermal runaway and affecting the operational safety of the battery pack. 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 existing battery packs that it is difficult to simultaneously achieve the heat exchange effect between individual cells and flow channel plates and accelerate the exhaust process of fluid ejected from the pressure relief valve.

[0004] The first aspect of this application provides a battery pack, comprising: A battery array, the battery array comprising at least one battery column, the battery column comprising a plurality of individual cells arranged along a first direction; a pressure relief valve is provided on the bottom surface of each individual cell; A flow channel plate is disposed at the bottom of the battery array and configured to exchange heat with individual cells. The flow channel plate has a through-hole corresponding to the position of the pressure relief valve. At least one flow channel is disposed inside the flow channel plate, the flow channel extends along a first direction and is filled with heat exchange liquid to exchange heat with the individual cells, and the flow channel protrudes downward relative to the flow channel plate. The package body is provided with a bottom plate, and an exhaust space is formed between the bottom plate and the flow channel plate; The flow channel plate has a pressure relief guide on its bottom surface. The pressure relief guide is located at the bottom of the flow channel plate near the pressure relief valve and has an outlet facing the flow channel. The pressure relief guide is configured to allow the fluid ejected from the pressure relief valve to flow out from below the flow channel in the direction corresponding to the flow channel. The height of the flow channel is E mm, and the height of the outlet is F mm. E / F satisfies 0.4≤E / F≤0.8.

[0005] Another aspect of this application provides an electrical device including the aforementioned battery pack.

[0006] In the battery pack of the above embodiments of this application, when the ratio E / F between the height E of the flow channel and the height F of the outlet satisfies 0.4≤E / F≤0.8, it can not only ensure the content of heat exchange liquid contained in the flow channel, thereby effectively maintaining the temperature difference between the flow channel plate and the individual cells and improving the heat exchange efficiency between the flow channel and the individual cells, but also effectively reduce the resistance generated by the flow channel to the fluid flow process, shorten the residence time of the high-temperature and high-pressure fluid in the exhaust space, so as to reduce the impact of the high-temperature and high-pressure fluid on other individual cells, effectively control the thermal runaway of individual cells, prevent the spread of thermal runaway, and effectively improve the working safety of the battery pack. Attached Figure Description

[0007] It should be understood that the following figures only show some embodiments of this application and should not be regarded as a limitation on 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 perspective view of the battery pack according to an embodiment of this application.

[0011] Figure 2 This is a cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0012] Figure 3 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0013] Figure 4 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0014] Figure 5 This is another perspective view of the battery pack according to an embodiment of this application.

[0015] Figure 6 This is a partial bottom view of the battery pack according to an embodiment of this application.

[0016] Figure 7 This is a partial bottom view of the battery pack according to an embodiment of this application.

[0017] Attached image labels: 10. Package body; 11. Base plate; 12. Border; 20. Battery array; 2. Individual cell; 21. Housing; 22. Cover plate; 23. Pressure relief valve; 28. Battery row; 30. Flow channel plate; 31. Pressure relief guide; 311. Main baffle; 312. Side baffle; 314. Air outlet; 32. Flow channel; 321. First section; 322. Second section; 40. Exhaust space.

[0018] X - First direction; Y - Second direction; Z - Height direction. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] like Figures 1 to 6 As shown in the figure, this application embodiment provides a battery pack, including a battery array 20, a flow channel plate 30, and a pack body 10. The pack body 10 includes a base plate 11 and a frame 12 fixed to the outer periphery of the base plate 11, with the base plate 11 and the frame 12 forming a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0022] Specifically, it can be understood that the battery pack in this embodiment is a complete functional unit that can directly output electrical energy, consisting of a battery array 20, a battery management system, a thermal management system, an electrical connection system, structural components, and protective components, all housed within a pack body 10 and sealed by a cover plate 22. The battery array 20 is formed by multiple individual batteries 2 connected in series and / or parallel. The electrical connection system includes high-voltage connectors, low-voltage connectors, and wiring harnesses. The structural components include a shell and a support frame. This battery pack, as a rechargeable battery, can be a power source for new energy vehicles. The battery pack in this embodiment may also include a separator plate, with both the individual battery 2 and the separator plate located within the pack body 10. The separator plate is located on the side of the individual battery 2 away from the bottom plate 11 of the pack body 10, separating the individual battery 2 from other components located above it.

[0023] The aforementioned housing 10 can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery array 20, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The housing 10 provides installation space for the battery array 20, battery management system (BMS), cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components within the housing 10, ensuring that they maintain a relatively stable position during battery pack operation and preventing damage to components or loosening of connections due to vibration, impact, or other factors.

[0024] The package 10 may include a lower package and an upper package. The lower package includes a base plate 11 and a frame 12 connected to and surrounding the base plate 11. The upper package is connected to the frame 12 and has a cover plate 22 opposite to the base plate 11. The upper and lower packages together form a receiving cavity. The frame 12 and the base plate 11 can be integrally formed or processed separately and then fixedly connected. Specifically, the frame 12 and the base plate 11 are fixedly connected by welding, riveting, screwing, etc. When the package 10 is a cube, the frame 12 of the lower package generally has four side plates, which surround the periphery of the base plate 11. In other embodiments, the shape of the package 10 may also be a cylinder or other shapes. The frame 12 mainly serves to support, protect, and connect. The frame 12 may be formed by splicing multiple beams together. The frame 12 may be rectangular, circular, polygonal, etc., without limitation. The beams of the frame 12 may have a solid structure or contain cavities. The base plate 11 is the main load-bearing component of the battery pack, used to support and fix the battery array 20, battery management system, cooling system and other components inside the battery pack. The pack body 10 can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite material and carbon fiber reinforced composite material.

[0025] Multiple individual cells 2 with similar capacity and internal resistance are connected in series or in parallel to form a battery array 20. The battery array 20 includes at least one battery column 28, which includes multiple individual cells 2 arranged along a first direction; a pressure relief valve 23 is provided on the bottom surface of the individual cells 2.

[0026] It is understood that a single battery cell 2 includes at least a housing 21 and a cover plate 22 fixedly connected to each other, as well as a battery cell and an electrolyte. The housing 21 and the cover plate 22 are used together to contain the battery cell and the electrolyte. The cover plate 22 may be provided with at least one positive electrode post and at least one negative electrode post for electrical connection with the outside. The battery cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, one end of which is electrically connected to the tab, and the other end is electrically connected to the electrode post. It is understood that the single battery cell 2 in this application embodiment can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and is not limited thereto.

[0027] The pressure relief valve 23 refers to a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a single cell 2 reaches a predetermined threshold. During battery use, the pressure relief valve 23 is mainly used to allow gas to escape from the battery and reduce internal pressure in cases of thermal runaway, preventing excessive pressure buildup that could cause deformation or explosion. The material of the pressure relief valve 23 is not limited, including but not limited to aluminum, steel, and alloys. The shape of the pressure relief valve 23 is not limited, such as square, oblong, elliptical, racetrack-shaped, etc. The type of pressure relief valve 23 is not limited, such as a notched pressure relief valve 23, which can be formed by stamping or laser etching.

[0028] Because a pressure relief valve 23 is provided on the bottom surface of the individual battery cell 2, when the internal pressure of the battery reaches the pressure relief intensity of the valve 23, the valve 23 promptly connects to the outside and releases pressure; the ejected fluids from the valve 23 are discharged downwards, avoiding direct contact with the electrical components above the individual battery cell 2, thereby achieving thermoelectric separation and improving the overall safety of the battery pack. A flow channel plate 30 is located at the bottom of the battery array 20 and is configured to exchange heat with the individual battery cell 2; specifically, the flow channel plate 30 is in contact with the bottom surface of the individual battery cell 2, and can heat and / or cool the individual battery cell 2 as needed.

[0029] The flow channel plate 30 is a component for regulating the temperature of the individual battery cell 2. The flow channel plate 30 has an internal heat exchange channel for the flow of a heat exchange medium. This medium can be a gas such as air, a liquid such as water, alcohol, refrigerant, or oil, or a solid such as thermally conductive adhesive or solder paste. The heat exchange channel has an inlet and an outlet for the heat exchange medium. The medium enters the channel through the inlet, exchanges heat with the individual battery cell 2, and then exits through the outlet, thus achieving heat exchange for the individual battery cell 2. The flow channel plate 30 contains heat pipes that rapidly transfer heat through convection. The flow channel plate 30 may include a heating element and an electrical connector. The heating element can be a heating wire, a heating film, or a heating plate; this application does not impose any limitations. The flow channel plate 30 can be made of a metal material, such as aluminum alloy or magnesium alloy, or it can be a plastic component.

[0030] like Figures 3 to 6 As shown, the flow channel plate 30 has at least one flow channel 32 extending along a first direction and containing a heat exchange liquid for heat exchange with the individual battery cells 2. Therefore, the flow channel plate 30 can utilize the heat exchange liquid flowing within the flow channel 32 for heat exchange, ensuring that the individual battery cells 2 operate within their optimal operating range. Since the flow channel 32 extends along the first direction, the heat exchange liquid within the same flow channel 32 can simultaneously exchange heat with multiple individual battery cells 2 arranged along the first direction, thereby ensuring the heat exchange efficiency between the flow channel plate 30 and the individual battery cells 2 of the battery array 20. It is understood that the heat exchange liquid can be water, oil, an aqueous solution of ethylene glycol, etc., and is not limited thereto.

[0031] like Figure 3 and Figure 4 As shown, the flow channel plate 30 is provided with a through-hole corresponding to the position of the pressure relief valve 23, and an exhaust space 40 is formed between the bottom plate 11 of the package 10 and the flow channel plate 30. In this way, since the flow channel plate 30 is provided with a through-hole corresponding to the position of the pressure relief valve 23, the ejected material and other fluids ejected by the pressure relief valve 23 can be discharged downward through the through-hole to the exhaust space 40 between the bottom plate 11 of the package 10 and the flow channel plate 30.

[0032] Among them, such as Figure 3 and Figure 4 As shown, a pressure relief guide 31 is provided on the bottom surface of the flow channel plate 30. The pressure relief guide 31 is located at the bottom of the flow channel plate 30 near the corresponding pressure relief valve 23, and has an air outlet 314 facing the flow channel 32. The pressure relief guide 31 is configured to cause the fluid ejected from the pressure relief valve 23 to flow out from below the flow channel 32 in the direction of the corresponding flow channel 32.

[0033] Therefore, during the operation of the battery pack in this embodiment, the fluid ejected after the pressure relief valve 23 of any single cell 2 ruptures can be discharged downward through the through-hole to the exhaust space 40 between the bottom plate 11 and the flow channel plate 30 of the pack body 10. Since a pressure relief guide 31 is provided at the bottom of the flow channel plate 30 near the position corresponding to the pressure relief valve 23, and the pressure relief guide 31 has an outlet 314 facing the flow channel 32, the pressure relief guide 31 can make the fluid ejected by the pressure relief valve 23 flow out from below the flow channel 32 in the direction of the corresponding flow channel 32, and then be discharged outside the battery pack through the main exhaust port and other components on the pack body 10.

[0034] In a specific embodiment, such as Figure 6 As shown, the pressure relief guide 31 includes a main baffle 311 and two side baffles 312 located on both sides of the main baffle 311. The main baffle 311 and the two side baffles 312 together form an outlet 314 facing the flow channel 32. Since the pressure relief guide 31 includes a main baffle 311 and two side baffles 312 located on both sides of the main baffle 311, an outlet 314 is formed between the ends of the two side baffles 312 away from the main baffle 311. The high-temperature and high-pressure fluid ejected by the pressure relief valve 23 can flow out from the outlet 314, thereby effectively restricting the flow direction of the high-temperature and high-pressure fluid.

[0035] like Figure 4 As shown, since the upper panel of the flow channel plate 30 is flat, a flow channel 32 that protrudes downward relative to the flow channel plate 30 needs to be formed in order to accommodate the heat exchange liquid. In the battery pack of this embodiment, the height of the flow channel 32 is E mm, the height of the air outlet 314 is F mm, and E / F satisfies 0.4≤E / F≤0.8.

[0036] When the ratio E / F between the height of the flow channel 32 (E mm) and the height of the outlet 314 (F mm) is less than 0.4, the proportion of the height E mm of the flow channel 32 is too low, resulting in a small amount of heat exchange fluid that can be contained within the flow channel 32. During battery pack operation, the heat exchange fluid in the flow channel 32 heats up quickly, leading to a small temperature difference between the flow channel plate 30 and the individual battery cell 2, thus affecting the heat exchange efficiency between the flow channel 32 and the individual battery cell 2. When the ratio E / F between mm is greater than 0.8, the height of the flow channel 32 is too high, requiring a large amount of space within the exhaust space 40. After the high-temperature and high-pressure fluid ejected from the pressure relief valve 23 flows out from the outlet 314 of the pressure relief guide 31, the high-temperature and high-pressure fluid flows out from below the flow channel 32 in the direction of the corresponding flow channel 32. The flow channel 32 will generate a large resistance to the flow process of the fluid, thus causing the high-temperature and high-pressure fluid to remain in the exhaust space 40 for too long. The high-temperature and high-pressure fluid is likely to affect other single cells 2, and may cause thermal runaway propagation, affecting the working safety of the battery pack.

[0037] Therefore, in the battery pack of this application embodiment, when the ratio E / F between the height of the flow channel 32 (E mm) and the height of the outlet 314 (F mm) satisfies 0.4 ≤ E / F ≤ 0.8, it not only ensures the content of heat exchange liquid contained in the flow channel 32, thereby effectively maintaining the temperature difference between the flow channel plate 30 and the individual battery cell 2 and improving the heat exchange efficiency between the flow channel 32 and the individual battery cell 2, but also effectively reduces the resistance generated by the flow channel 32 to the fluid flow process, shortens the residence time of the high-temperature and high-pressure fluid in the exhaust space 40, reduces the impact of the high-temperature and high-pressure fluid on other individual battery cells 2, effectively controls the thermal runaway of the individual battery cells 2, prevents the spread of thermal runaway, and effectively improves the working safety of the battery pack. In specific embodiments, the ratio E / F between the height of the flow channel 32 (E mm) and the height of the outlet 314 (F mm) can be selected from specific values ​​such as 0.4, 0.5, 0.55, 0.6, 0.8, etc., and is not limited here.

[0038] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the height E mm of the flow channel 32 satisfies 2 mm ≤ E mm ≤ 4 mm. When the height E mm of the flow channel 32 is less than 2 mm, the amount of heat exchange liquid that can be contained in the flow channel 32 is relatively small, affecting the heat exchange efficiency between the flow channel 32 and the single cell 2. When the height E mm of the flow channel 32 is greater than 4 mm, the height of the flow channel 32 is too large, requiring more space in the exhaust space 40. The flow channel 32 will generate greater resistance to the flow of fluid, resulting in the high-temperature and high-pressure fluid remaining in the exhaust space 40 for too long. The high-temperature and high-pressure fluid is likely to affect other single cells 2, affecting the working safety of the battery pack.

[0039] Therefore, in the battery pack of this application embodiment, when the height E mm of the flow channel 32 satisfies 2 mm ≤ E mm ≤ 4 mm, it not only ensures the content of heat exchange liquid contained in the flow channel 32 and improves the heat exchange efficiency between the flow channel 32 and the individual battery cell 2, but also effectively reduces the resistance generated by the flow channel 32 to the fluid flow process, shortens the residence time of the high-temperature and high-pressure fluid in the exhaust space 40, and improves the working safety of the battery pack. In specific embodiments, the height E mm of the flow channel 32 can be selected from specific values ​​such as 2 mm, 2.4 mm, 3 mm, 3.5 mm, and 4 mm, and is not limited here.

[0040] Furthermore, in one embodiment of this application, the height F mm of the vent 314 satisfies 3 mm ≤ F mm ≤ 10 mm. When the height F mm of the vent 314 is less than 3 mm, the time required for the fluid ejected from the pressure relief valve 23 to completely exit the vent 314 is longer, the fluid flows out of the vent 314 at a slower speed, and the fluid remains in the exhaust space 40 for too long. The high temperature and high pressure of the fluid can easily affect other individual battery cells 2, and thermal runaway may occur, affecting the working safety of the battery pack. When the height F mm of the vent 314 is greater than 10 mm, the required thickness of the exhaust space 40 between the flow channel plate 30 and the base plate 11 is larger, and the height difference between the flow channel plate 30 and the base plate 11 is larger, affecting the energy density of the battery pack in this embodiment of the application. Therefore, when the height F mm of the vent 314 satisfies 3 mm ≤ F mm ≤ 10 mm, it not only shortens the residence time of the high-temperature and high-pressure fluid in the exhaust space 40, thereby reducing the impact of the high-temperature and high-pressure fluid on other individual cells 2 and effectively improving the working safety of the battery pack, but also effectively reduces the required thickness of the exhaust space 40 between the flow channel plate 30 and the base plate 11, thereby increasing the energy density of the battery pack in this embodiment. In specific embodiments, the height F mm of the vent 314 can be selected from specific values ​​such as 3 mm, 4 mm, 6 mm, 8 mm, and 10 mm, and is not limited here.

[0041] like Figure 4As shown, in one embodiment of this application, in the second direction, the distance between the flow channel 32 and the air outlet 314 is c mm, where c mm satisfies 5 ≤ ​​c mm ≤ 15 mm. When the distance c mm between the flow channel 32 and the air outlet 314 is less than 5 mm, the distance between the flow channel 32 and the air outlet 314 is too close, and the interference of the flow channel 32 with the air outlet 314 is large, thereby increasing the resistance generated by the flow channel 32 to the fluid flow process and prolonging the residence time of the high-temperature and high-pressure fluid in the exhaust space 40. When the distance c mm between the flow channel 32 and the air outlet 314 is greater than 15 mm, the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 will be reduced, affecting the heat exchange efficiency between the flow channel 32 and the single cell 2. Therefore, when the distance c mm between the flow channel 32 and the outlet 314 satisfies 5 mm ≤ c mm ≤ 15 mm, it can effectively reduce the resistance of the flow channel 32 to the fluid flow process, shorten the residence time of the high-temperature and high-pressure fluid in the exhaust space 40, thereby reducing the impact of the high-temperature and high-pressure fluid on other individual cells 2, and also ensure the heat exchange area between the flow channel 32 and the bottom surface of the individual cell 2, thereby improving the heat exchange efficiency between the flow channel 32 and the individual cell 2. In a specific embodiment, in the second direction, the distance c mm between the flow channel 32 and the outlet 314 can be selected from specific values ​​such as 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, etc., and is not limited here.

[0042] like Figure 4As shown, in one embodiment of this application, in the second direction, the distance between the flow channel 32 and the pressure relief valve 23 is h mm, where h mm satisfies 5.5 mm ≤ h mm ≤ 18 mm. When the distance h mm between the flow channel 32 and the pressure relief valve 23 is less than 5.5 mm, the distance between the flow channel 32 and the air outlet 314 is too close, resulting in greater interference between the flow channel 32 and the air outlet 314. This increases the resistance generated by the flow channel 32 to the fluid flow process and prolongs the residence time of the high-temperature and high-pressure fluid in the exhaust space 40. When the distance h mm between the flow channel 32 and the pressure relief valve 23 is greater than 18 mm, the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 will be reduced, affecting the heat exchange efficiency between the flow channel 32 and the single cell 2. Therefore, when the distance h mm between the flow channel 32 and the pressure relief valve 23 satisfies 5.5 mm ≤ h mm ≤ 18 mm, it can effectively reduce the resistance of the flow channel 32 to the fluid flow process, shorten the residence time of the high-temperature and high-pressure fluid in the exhaust space 40, thereby reducing the impact of the high-temperature and high-pressure fluid on other individual cells 2, and also ensure the heat exchange area between the flow channel 32 and the bottom surface of the individual cell 2, thereby improving the heat exchange efficiency between the flow channel 32 and the individual cell 2. In a specific embodiment, in the second direction, the distance h mm between the flow channel 32 and the pressure relief valve 23 can be selected from specific values ​​such as 5.5 mm, 8 mm, 10 mm, 12 mm, 18 mm, etc., and is not limited here.

[0043] like Figure 4 As shown, in one embodiment of this application, the distance between the flow channel 32 and the base plate 11 in the height direction of the single cell 2 is g mm, where g mm satisfies 3 mm ≤ g mm ≤ 10 mm.

[0044] When the distance g mm between the flow channel 32 and the base plate 11 is less than 3 mm in the height direction, the distance between the flow channel 32 and the pressure relief valve 23 is too small. This results in greater resistance for the high-temperature, high-pressure fluid flowing out from below the flow channel 32, causing the fluid to remain in the exhaust space 40 for too long, potentially affecting other individual cells 2. Conversely, when the distance g mm between the flow channel 32 and the base plate 11 is greater than 10 mm, the flow channel 32 itself is too low, resulting in a smaller amount of heat exchange fluid inside, which affects the heat exchange efficiency between the flow channel 32 and the individual cells 2. Therefore, the optimal solution effectively reduces the resistance generated by the flow channel 32 during fluid flow, shortens the residence time of the high-temperature, high-pressure fluid in the exhaust space 40 to reduce its impact on other individual cells 2, and ensures sufficient heat exchange fluid content within the flow channel 32, thereby improving the heat exchange efficiency between the flow channel 32 and the individual cells 2. In a specific embodiment, the distance g mm between the flow channel 32 and the base plate 11 can be selected from specific values ​​such as 3 mm, 5 mm, 6 mm, 8 mm, 10 mm, etc., and is not limited here.

[0045] like Figure 7 As shown, in one embodiment of this application, a clearance area is provided in the region of the flow channel 32 corresponding to the location of the pressure relief valve 23; the maximum length of the flow channel 32 in the first direction is u mm, the maximum width in the second direction is v mm, and the area within the outer contour of the flow channel 32 is w mm. 2 As shown in Figure 1.02≤u×v / w≤1.57, the product u×v of the maximum length u mm in the first direction and the maximum width v mm in the second direction is the maximum area of ​​the flow channel 32 without avoiding the pressure relief valve.

[0046] The maximum length u mm of the flow channel 32 in the first direction, the maximum width v mm in the second direction, and the area w mm within the outer contour of the flow channel 32 are given. 2 When the relationship u×v / w is less than 1.02, the area of ​​the avoidance zone is too small, making it difficult to leave enough space for the pressure relief valve 23, which affects the settable area of ​​the pressure relief valve 23, and thus affects the exhaust pressure reduction speed of the single cell 2 after the pressure relief valve 23 ruptures.

[0047] The maximum length u mm of the flow channel 32 in the first direction, the maximum width v mm in the second direction, and the area w mm within the outer contour of the flow channel 32 are given. 2 When the relationship u×v / w is greater than 1.5, the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 will be greatly reduced, affecting the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0048] Therefore, the maximum length u mm of the flow channel 32 in the first direction, the maximum width v mm in the second direction, and the area w mm within the outer contour of the flow channel 32 are all within the flow channel 32. 2 When the relationship u×v / w satisfies 1.02≤u×v / w≤1.5, it can not only leave enough area for the pressure relief valve 23 to ensure that the exhaust pressure reduction speed of the single cell 2 after the pressure relief valve 23 is broken can meet the requirements, but also ensure that the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 can meet the requirements, thereby ensuring the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0049] Furthermore, in one embodiment of this application, the maximum length of the flow channel 32 in the first direction is u mm, the maximum width in the second direction is v mm, and the area within the outer contour of the flow channel 32 is w mm. 2 , u×v / w satisfies 1.1≤u×v / w≤1.3.

[0050] The maximum length u mm of the flow channel 32 in the first direction, the maximum width v mm in the second direction, and the area w mm within the outer contour of the flow channel 32 are given. 2 When the relationship u×v / w satisfies 1.1≤u×v / w≤1.3, it is possible to increase the exhaust pressure reduction rate of the single cell 2 after the pressure relief valve 23 ruptures by increasing the area of ​​the pressure relief valve 23, and further improve the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0051] In a specific embodiment, the maximum length of the flow channel 32 in the first direction is u mm, the maximum width in the second direction is v mm, and the area w mm within the outer contour of the flow channel 32 is w mm. 2 The value of the relation u×v / w can be selected from specific values ​​such as 1.02, 1.05, 1.1, 1.2, 1.25, 1.3, 1.5, etc., and there are no restrictions here.

[0052] like Figure 6 As shown, in one embodiment of this application, the flow channel 32 has a first section 321 and a second section 322. The projection of the pressure relief valve 23 along the second direction is completely within the projection of the first section 321 along the second direction, and the projection of the pressure relief valve 23 along the second direction is completely outside the projection of the second section 322 along the second direction. The second direction is perpendicular to the first direction and perpendicular to the height direction of the single cell 2. That is, the first section 321 completely covers the area where the pressure relief valve 23 of the single cell 2 is located in the extension direction of the flow channel 32, and the second section does not correspond to the area where the pressure relief valve 23 of the single cell 2 is located in the extension direction of the flow channel 32.

[0053] It is understandable that, since the first section 321 completely covers the area where the pressure relief valve 23 of the single cell 2 is located in the extension direction of the flow channel 32, the pressure relief valve 23 needs to occupy some space. Therefore, the width of the first section 321 in the second direction needs to be reduced to leave room for the arrangement of the pressure relief valve 23. Compared with the first section 321, the width of the second section 322 in the second direction can be set to be larger, thereby increasing the heat exchange area between the flow channel 32 and the single cell 2 and improving the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0054] like Figure 4 As shown, in one embodiment of this application, the first segment 321 is configured such that its width continuously decreases along the height direction of the individual battery cell 2. Because the width of the first segment 321 continuously decreases along the height direction of the individual battery cell 2, the side of the flow channel 32 facing the fluid can be set as an inclined surface. This effectively reduces the resistance generated by the flow channel 32 to the fluid flow process, shortens the residence time of the high-temperature, high-pressure fluid in the exhaust space 40, reduces the impact of the high-temperature, high-pressure fluid on other individual battery cells 2, effectively controls the thermal runaway of the individual battery cells 2, prevents the spread of thermal runaway, and effectively improves the operational safety of the battery pack.

[0055] like Figure 3 and Figure 6 As shown, for at least one cell 2, the projection of the first section 321 of at least one flow channel 32 along the height direction of the cell 2 at least partially coincides with the projection of the bottom surface of the cell 2 along the height direction, and the overlapping area is a defined heat exchange area; the width of the defined heat exchange area along the second direction is M mm, the width of the bottom surface of the cell 2 along the second direction is N mm, and M / N satisfies 0.1≤M / N≤0.5.

[0056] It is understood that the aforementioned defined heat exchange area is the area where the first section 321 and the bottom surface of the single cell 2 are directly in contact with each other, and the first section 321 of the flow channel 32 directly exchanges heat with the bottom surface of the single cell 2 through the defined heat exchange area.

[0057] When the ratio M / N between the width M mm of the heat exchange area along the second direction and the width N mm of the bottom surface of the single cell 2 along the second direction is less than 0.1, the width of the heat exchange area is too small, which can easily affect the heat exchange efficiency between the first section 321 and the bottom surface of the single cell 2, and thus affect the overall heat exchange efficiency between the flow channel 32 and the single cell 2. When the ratio M / N between the width M mm of the heat exchange area along the second direction and the width N mm of the bottom surface of the single cell 2 along the second direction is greater than 0.5, the width of the heat exchange area is too large, which not only affects the area that can be arranged for the pressure relief valve 23, but also makes the distance between the first section 321 and the pressure relief valve 23 too close. When the pressure relief valve 23 of any single cell 2 sprays fluid downward, the side wall of the flow channel 32 is prone to breakage and heat exchange liquid leakage, which can affect the normal operation of other single cells 2.

[0058] Therefore, when the ratio M / N between the width M mm of the heat exchange area along the second direction and the width N mm of the bottom surface of the single cell 2 along the second direction satisfies 0.1 ≤ M / N ≤ 0.5, it not only ensures the heat exchange efficiency between the first section 321 and the bottom surface of the single cell 2, and reduces the flow resistance of the liquid flowing through the first section 321 to increase the flow velocity of the heat exchange liquid in the flow channel 32, thus affecting the heat exchange efficiency, it also allows space for the arrangement of the pressure relief valve 23, avoiding situations such as the side wall of the flow channel 32 breaking or the heat exchange liquid leaking when the pressure relief valve 23 sprays fluid downwards, ensuring that other single cells 2 continue to work normally, and improving the working safety of the battery pack in this embodiment. In specific embodiments, the above ratio M / N can be 0.1, 0.15, 0.3, 0.4, 0.5, etc., which will not be elaborated here.

[0059] like Figure 4 As shown, in one embodiment of this application, for at least one single cell 2, the projections of the first sections 321 of two adjacent flow channels 32 arranged along the second direction along the height direction of the single cell 2 at least partially coincide with the projection of the bottom surface of the single cell 2 along the height direction. That is, for this single cell 2, the first sections 321 of two adjacent flow channels 32 can exchange heat with the bottom surface of the single cell 2. In this case, the defined heat exchange area includes the sum of the overlapping areas of the first sections 321 of the two flow channels 32 and the bottom surface of the single cell 2, and its width M mm is the sum of the widths of the two parts.

[0060] In another embodiment of this application, for at least one single cell 2, the projection of the first section 321 of only one flow channel 32 along the height direction of the single cell 2 at least partially coincides with the projection of the bottom surface of the single cell 2 along the height direction. That is, for this single cell 2, only the first section 321 of the flow channel 32 can exchange heat with the bottom surface of the single cell 2. In this case, the width M mm of the heat exchange area is defined as the width of the area.

[0061] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the width M mm of the heat exchange area along the second direction is defined as 3 mm ≤ M mm ≤ 15 mm. When the width M mm of the heat exchange area along the second direction is less than 3 mm, the width of the heat exchange area is too small, which can easily affect the heat exchange efficiency between the first section 321 and the bottom surface of the single cell 2, and thus affect the overall heat exchange efficiency between the flow channel 32 and the single cell 2. When the width M mm of the heat exchange area along the second direction is greater than 15 mm, the width of the heat exchange area is too large, which not only affects the area that the pressure relief valve 23 can be arranged in, but also makes the distance between the first section 321 and the pressure relief valve 23 too close. When any single cell 2 pressure relief valve 23 sprays fluid downward, the side wall of the flow channel 32 is prone to breakage and heat exchange liquid leakage, which affects the continued normal operation of other single cells 2.

[0062] Therefore, when the width M mm of the heat exchange area along the second direction is limited to 3 mm ≤ M mm ≤ 15 mm, it not only ensures the heat exchange efficiency between the first section 321 and the bottom surface of the individual battery 2, and reduces the flow resistance of the liquid flowing through the first section 321 to increase the flow velocity of the heat exchange liquid in the flow channel 32, thus affecting the heat exchange efficiency, but also provides space for the arrangement of the pressure relief valve 23, avoiding situations such as the side wall of the flow channel 32 breaking or the heat exchange liquid leaking when the pressure relief valve 23 sprays fluid downwards, ensuring that other individual batteries 2 continue to work normally, and improving the working safety of the battery pack in this embodiment. In specific embodiments, the value of the width M mm of the heat exchange area along the second direction can be 3 mm, 5 mm, 8 mm, 10 mm, 15 mm, etc., which will not be elaborated here.

[0063] like Figure 4As shown, in one embodiment of this application, the width N mm of the bottom surface of the single cell 2 along the second direction satisfies 30 mm ≤ N mm ≤ 55 mm. When the width N mm of the bottom surface of the single cell 2 along the second direction is less than 30 mm, the width N mm of the bottom surface of the single cell 2 is too small, which not only makes it difficult to arrange the pressure relief valve 23, but also affects the heat exchange area between the first section 321 and the second section 322 of the flow channel 32 and the bottom surface of the single cell 2, thereby affecting the overall heat exchange efficiency between the flow channel 32 and the single cell 2.

[0064] When the width N mm of the bottom surface of the single cell 2 along the second direction is greater than 55 mm, the width N mm of the bottom surface of the single cell 2 is too large, and the bottom surface width occupied by a single cell 2 is large, thereby reducing the total number of single cells 2 that can be arranged in the battery pack of this application embodiment.

[0065] Therefore, when the width N mm of the bottom surface of the single cell 2 along the second direction satisfies 30 mm ≤ N mm ≤ 55 mm, it not only facilitates the arrangement of the pressure relief valve 23 on the bottom surface of the single cell 2, but also ensures the heat exchange area between the first section 321 and the second section 322 of the flow channel 32 and the bottom surface of the single cell 2, thereby ensuring the overall heat exchange efficiency between the flow channel 32 and the single cell 2. In a specific embodiment, the value of the width N mm of the bottom surface of the single cell 2 along the second direction can be 30 mm, 35 mm, 40 mm, 42 mm, 55 mm, etc., which will not be elaborated here.

[0066] like Figure 3 As shown, in one embodiment of this application, along the second direction, the distance between the heat exchange area and the pressure relief valve 23 is defined as D mm, where D mm satisfies 3 mm ≤ D mm ≤ 15 mm.

[0067] When the distance between the heat exchange area and the pressure relief valve 23 is less than 3 mm (D mm), the distance between the first section 321 and the pressure relief valve 23 is too close. When any single cell 2's pressure relief valve 23 sprays fluid downwards, the sidewall of the flow channel 32 is prone to breakage and heat exchange liquid leakage, affecting the normal operation of other single cells 2. When the distance between the heat exchange area and the pressure relief valve 23 is greater than 15 mm (D mm), the width of the heat exchange area is limited, which can easily affect the heat exchange efficiency between the first section 321 and the bottom surface of the single cell 2, and thus affect the overall heat exchange efficiency between the flow channel 32 and the single cell 2.

[0068] Therefore, when the distance D mm between the heat exchange area and the pressure relief valve 23 satisfies 3 mm ≤ D mm ≤ 15 mm, not only is space provided for the arrangement of the pressure relief valve 23, preventing situations such as breakage of the sidewall of the flow channel 32 or leakage of the heat exchange liquid when the pressure relief valve 23 sprays fluid downwards, thus ensuring the continued normal operation of other individual cells 2 and improving the working safety of the battery pack in this embodiment, but it also ensures the heat exchange efficiency between the first section 321 and the bottom surface of the individual cell 2, improving the overall heat exchange efficiency between the flow channel 32 and the individual cell 2. In specific embodiments, the value of the distance D mm between the heat exchange area and the pressure relief valve 23 can be 3 mm, 15 mm, etc., which will not be elaborated here.

[0069] Specifically, such as Figure 6 As shown, in the battery pack of this application embodiment, the maximum width of the first segment 321 in the second direction is A, and the maximum width of the second segment 322 in the second direction is B, and A / B satisfies 0.1≤A / B≤0.3.

[0070] When the ratio A / B of the maximum width A of the first section 321 in the second direction and the maximum width B of the second section 322 in the second direction is less than 0.1, the width of the first section 321 is too small. This not only easily affects the heat exchange efficiency between the first section 321 and the bottom surface of the single cell 2, but also, when the heat exchange liquid flows from the first section 321 to the second section 322, in the second direction, only the heat exchange liquid in the vicinity of the line connecting the inlet and outlet of the second section 322 flows relatively quickly. However, at the edge of the second section 322, because it is far from the inlet or outlet of the second section 322, the flow velocity of the liquid is extremely low, making it difficult to participate in the exchange of the mainstream, thus forming a dead zone. The temperature of the heat exchange liquid in the dead zone tends to be the same as the temperature of the bottom surface of the single cell 2, and heat easily accumulates in the dead zone, resulting in extremely low heat exchange efficiency.

[0071] When the ratio A / B of the maximum width A of the first section 321 in the second direction and the maximum width B of the second section 322 in the second direction is greater than 0.3, the width of the first section 321 is too large, and the width of the second section 322 will be restricted. This will result in the total heat exchange area between the flow channel 32 and the individual cells 2 being restricted, and will also affect the heat exchange efficiency between the flow channel 32 and the individual cells 2.

[0072] Therefore, when the maximum width A of the first segment 321 in the second direction and the maximum width B of the second segment 322 in the second direction satisfy 0.1 ≤ A / B ≤ 0.3, not only can the heat exchange efficiency between the first segment 321 and the bottom surface of the single cell 2 be guaranteed, but the dead zone ratio in the second segment 322 can also be reduced, thereby improving the heat exchange efficiency between the second segment 322 and the bottom surface of the single cell 2. Furthermore, the total heat exchange area between the flow channel 32 and the single cell 2 can be effectively guaranteed, thus ensuring the overall heat exchange efficiency between the flow channel 32 and the single cell 2. In specific embodiments, the ratio of A / B can be 0.1, 0.15, 0.2, 0.24, 0.3, etc., which will not be elaborated further here.

[0073] Specifically, in one embodiment of this application, the maximum width A of the first segment 321 in the second direction satisfies 10 mm ≤ A ≤ 80 mm. When the maximum width A of the first segment 321 in the second direction is less than 10 mm, the width of the first segment 321 is too small, which can easily affect the heat exchange efficiency between the first segment 321 and the bottom surface of the single cell 2, and also increase the flow resistance of the liquid flowing through the first segment 321, thereby reducing the flow velocity of the heat exchange liquid in the flow channel 32 and affecting the heat exchange efficiency. When the maximum width A of the first segment 321 in the second direction is greater than 80 mm, the width of the first segment 321 is too large, and the distance between the first segment 321 and the pressure relief valve 23 is too close. When any single cell 2 pressure relief valve 23 sprays fluid downward, the side wall of the flow channel 32 is prone to breakage, heat exchange liquid leakage, etc., which can affect the normal operation of other single cells 2.

[0074] Therefore, when the maximum width A of the first section 321 in the second direction satisfies 10 mm ≤ A ≤ 80 mm, it not only ensures the heat exchange efficiency between the first section 321 and the bottom surface of the individual battery 2, and reduces the flow resistance of the liquid flowing through the first section 321 to increase the flow velocity of the heat exchange liquid in the flow channel 32, thus affecting the heat exchange efficiency, it also avoids situations such as the side wall of the flow channel 32 breaking and the heat exchange liquid leaking when the pressure relief valve 23 sprays fluid downwards, ensuring that other individual batteries 2 continue to work normally and improving the working safety of the battery pack in this embodiment. In specific embodiments, the value of the maximum width A of the first section 321 in the second direction can be 10 mm, 30 mm, 50 mm, 60 mm, 80 mm, etc., which will not be elaborated here.

[0075] like Figure 6As shown in one embodiment of this application, the maximum width B of the second segment 322 in the second direction satisfies 50 mm ≤ B ≤ 100 mm. When the maximum width B of the second segment 322 in the second direction is less than 50 mm, the width of the second segment 322 is too small, which can easily affect the heat exchange efficiency between the second segment 322 and the bottom surface of the single cell 2. When the maximum width B of the second segment 322 in the second direction is greater than 100 mm, a large dead zone is easily formed at the edge of the second segment 322. The heat of the heat exchange liquid in the dead zone tends to accumulate there, which can negatively impact the heat exchange efficiency between the second segment 322 and the bottom surface of the single cell 2. Therefore, when the maximum width B of the second segment 322 in the second direction satisfies 50 mm ≤ B ≤ 100 mm, not only can the heat exchange area between the first segment 321 and the bottom surface of the single cell 2 be guaranteed, but the dead zone formed at the edge of the second segment can also be reduced, thus improving the heat exchange efficiency between the second segment 322 and the bottom surface of the single cell 2 from two aspects. The maximum width B of the second section 322 in the second direction can be 50 mm, 60 mm, 75 mm, 90 mm, 100 mm, etc., which will not be elaborated here.

[0076] like Figure 6 As shown, in one embodiment of this application, in the first direction, the distance between the second section 322 and the adjacent pressure relief guide 31 is i mm, where i mm satisfies 2 mm ≤ i mm ≤ 8 mm. When the distance i mm between the second section 322 and the adjacent pressure relief guide 31 is less than 2 mm in the first direction, it is difficult to provide sufficient space for the side partition 312 of the pressure relief guide 31, which can easily lead to interference between the side partition 312 and the second section 322 of the flow channel 32. When the distance i mm between the second section 322 and the adjacent pressure relief guide 31 is greater than 8 mm, the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 will be greatly reduced, affecting the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0077] Therefore, in the first direction, when the distance i mm between the second section 322 and the adjacent pressure relief guide 31 satisfies 2 mm ≤ imm ≤ 8 mm, sufficient space can be provided for the side partition 312 of the pressure relief guide 31, avoiding interference between the side partition 312 and the second section 322 of the flow channel 32. Simultaneously, the heat exchange area between the flow channel 32 and the bottom surface of the individual battery 2 can meet the requirements, thereby ensuring the heat exchange efficiency between the flow channel 32 and the individual battery 2. In a specific embodiment, the distance i mm between the second section 322 and the adjacent pressure relief guide 31 can be selected from specific values ​​such as 2 mm, 4 mm, 5 mm, 6 mm, and 8 mm, and is not limited here.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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, include: A battery array (20) includes at least one battery column (28), which includes a plurality of individual cells (2) arranged along a first direction; a pressure relief valve (23) is provided on the bottom surface of each individual cell (2). A flow channel plate (30) is disposed at the bottom of the battery array (20) and configured to exchange heat with the individual battery cells (2). The flow channel plate (30) is provided with a through-hole corresponding to the position of the pressure relief valve (23). At least one flow channel (32) is provided inside the flow channel plate (30). The flow channel (32) extends along a first direction and is filled with heat exchange liquid to exchange heat with the individual battery cells (2). The flow channel (32) protrudes downward relative to the flow channel plate (30). Package (10), the package (10) is provided with a bottom plate (11), and an exhaust space (40) is formed between the bottom plate (11) and the flow channel plate (30). The flow channel plate (30) is provided with a pressure relief guide (31) on its bottom surface. The pressure relief guide (31) is located at the bottom of the flow channel plate (30) near the pressure relief valve (23) and has an outlet (314) facing the flow channel (32). The pressure relief guide (31) is configured to allow the fluid ejected by the pressure relief valve (23) to flow out from below the flow channel (32) in the direction corresponding to the flow channel (32). The height of the flow channel (32) is E mm, and the height of the outlet (314) is F mm. E / F satisfies 0.4≤E / F≤0.

8.

2. The battery pack according to claim 1, characterized in that, The height E mm of the flow channel (32) satisfies 2 mm ≤ E mm ≤ 4 mm.

3. The battery pack according to claim 1, characterized in that, The height F mm of the air outlet (314) satisfies 3 mm ≤ F mm ≤ 10 mm.

4. The battery pack according to claim 1, characterized in that, In the second direction, the distance between the flow channel (32) and the air outlet (314) is c mm, where c mm satisfies 5 mm ≤ c mm ≤ 15 mm. The second direction is perpendicular to the first direction and perpendicular to the height direction of the single cell (2).

5. The battery pack according to claim 1, characterized in that, In the second direction, the distance between the flow channel (32) and the pressure relief valve (23) is h mm, where h mm satisfies 5.5 mm ≤ h mm ≤ 18 mm. The second direction is perpendicular to the first direction and perpendicular to the height direction of the single cell (2).

6. The battery pack according to claim 1, characterized in that, In the height direction of the single cell (2), the distance between the flow channel (32) and the base plate (11) is g mm, where g mm satisfies 3 mm ≤ g mm ≤ 10 mm.

7. The battery pack according to claim 1, characterized in that, The flow channel (32) is provided with a clearance area corresponding to the location of the pressure relief valve (23); The maximum length of the flow channel (32) in the first direction is u mm, the maximum width in the second direction is v mm, and the area within the outer contour of the flow channel (32) is w mm. 2 The condition u×v / w satisfies 1.02≤u×v / w≤1.

5.

8. The battery pack according to claim 7, characterized in that, The maximum length u mm of the flow channel (32) in the first direction, the maximum width v mm in the second direction, and the area w mm within the outer contour of the flow channel (32) 2 , u×v / w satisfies 1.1≤u×v / w≤1.

3.

9. The battery pack according to claim 1, characterized in that, The pressure relief guide includes a main baffle (311) and two side baffles (312) located on both sides of the main baffle (311). The main baffle (311) and the two side baffles (312) together form an air outlet (314) facing the flow channel (32).

10. The battery pack according to any one of claims 1 to 9, characterized in that, The flow channel (32) has a first section (321) and a second section (322). The projection of the pressure relief valve (23) along the second direction is completely within the projection of the first section (321) along the second direction, and the projection of the pressure relief valve (23) along the second direction is completely outside the projection of the second section (322) along the second direction. The second direction is perpendicular to the first direction and perpendicular to the height direction of the single cell (2).

11. The battery pack according to claim 10, characterized in that, For at least one of the single cells (2), the projection of the first section (321) of at least one of the flow channels (32) along the height direction of the single cell (2) at least partially coincides with the projection of the bottom surface of the single cell (2) along the height direction, and the overlapping area is a defined heat exchange area. The width of the defined heat exchange area along the second direction is M mm, and the width of the bottom surface of the single cell (2) along the second direction is N mm, where M / N satisfies 0.1≤M / N≤0.

5.

12. The battery pack according to claim 11, characterized in that, For at least one of the single cells (2), the projection of the first section (321) of two adjacent flow channels (32) arranged along the second direction along the height direction of the single cell (2) is at least partially coincident with the projection of the bottom surface of the single cell (2) along the height direction.

13. The battery pack according to claim 11, characterized in that, For at least one of the single cells (2), the projection of the first section (321) of only one of the flow channels (32) along the height direction of the single cell (2) at least partially coincides with the projection of the bottom surface of the single cell (2) along the height direction.

14. The battery pack according to claim 11, characterized in that, The width M mm of the defined heat exchange area along the second direction satisfies 3 mm ≤ M mm ≤ 15 mm.

15. The battery pack according to claim 11, characterized in that, The width N mm of the bottom surface of the single cell (2) along the second direction satisfies 30 mm ≤ N mm ≤ 55 mm.

16. The battery pack according to claim 10, characterized in that, In the first direction, the distance between the second section (322) and the adjacent pressure relief guide (31) is i mm, where i mm satisfies 2 mm ≤ i mm ≤ 8 mm.

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

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