Battery pack and electric device with same

Abstract

The utility model relates to battery pack and the electric equipment with it. Battery pack includes a plurality of batteries and heat exchange spare, and the battery includes casing, and the bottom end surface of casing is equipped with two interval explosion -proof valve in first direction, and a plurality of batteries arrange along second direction. Heat exchange spare includes along second direction extension heat exchange runner, and heat exchange runner is located with bottom end surface in the same side of battery in up-down direction, and is located between two explosion -proof valve, and up-down direction, first direction and second direction two two vertical. Through the interval setting of two explosion -proof valve along first direction, form larger area between two explosion -proof valve, can provide abundant space for the arrangement of heat exchange runner, thereby can increase the size of heat exchange runner in first direction under the condition of not influencing explosion -proof valve normal work, this kind of implementation mode helps to reduce flow resistance, improve the flow efficiency of heat exchange medium, and then ensure the heat exchange performance of heat exchange spare.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to a battery pack and an electrical device having the same. Background Technology

[0002] Battery packs are a critical component of electric vehicles, energy storage devices, and other equipment, and their safety and reliability are paramount. During actual use, batteries generate a significant amount of heat during charging and discharging. If heat dissipation is inadequate or unevenly distributed, localized overheating can easily occur, potentially leading to thermal runaway. Therefore, battery packs are equipped with heat exchange components that conduct and dissipate heat through contact with the battery, thereby reducing localized temperatures and preventing safety risks.

[0003] In addition, battery casings are typically equipped with explosion-proof valves to release gas when the internal pressure is too high. However, the presence of these valves restricts the space available for heat exchange channels in the heat exchange components, resulting in a smaller channel cross-sectional area. This reduces the flow efficiency of the heat exchange medium and affects the overall heat dissipation performance. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and an electrical device having the same, aiming to optimize the spatial arrangement of the heat exchange channels and improve the heat exchange effect of the heat exchange components.

[0005] The battery pack provided by this utility model includes multiple batteries and a heat exchange component. Each battery includes a housing with two explosion-proof valves spaced apart in a first direction on its bottom surface. The multiple batteries are arranged along a second direction. The heat exchange component includes a heat exchange channel extending along the second direction. The heat exchange channel and the bottom surface are located on the same side of the battery in the vertical direction and between the two explosion-proof valves. The vertical direction, the first direction, and the second direction are all perpendicular to each other.

[0006] The beneficial effects of the battery pack provided by this utility model are as follows: By arranging two explosion-proof valves at intervals along the first direction, a large area is formed between the two explosion-proof valves, which provides ample space for the arrangement of the heat exchange channel. This allows the size of the heat exchange channel in the first direction to be increased without affecting the normal operation of the explosion-proof valves. This approach helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the heat exchange performance of the heat exchange components.

[0007] On the other hand, the present invention also provides an electrical device that includes the battery pack described in the first aspect. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0009] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0010] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0011] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0012] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 A bottom view of the battery pack.

[0014] Figure 3 yes Figure 1 A schematic diagram of the battery structure in the battery pack.

[0015] Figure 4 yes Figure 2 A schematic diagram of a part of the structure.

[0016] Figure 5 yes Figure 2 A schematic diagram of a part of the structure.

[0017] Figure 6 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0018] Figure 7 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0019] Reference numerals: Battery pack-100; Battery-10; Housing-11; Bottom end face-12; Explosion-proof valve-13; Heat exchanger-20; Heat exchange channel-21; First sub-channel-211; Second sub-channel-212; Third sub-channel-213; Upper end plate-22; Lower end plate-23; Recess-24; First recess-241; Second recess-242; Electrical equipment-200. Detailed Implementation

[0020] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0021] <Example Battery> Figure 3A battery 10 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery, the active materials can be activated by charging after discharge so that it can continue to be used.

[0022] The battery 10 includes a housing 11 and battery cells (not shown) disposed within the housing 11.

[0023] The housing 11 is a component used to provide a receiving space to house the battery cell and other components and isolate them from the outside environment. The housing 11 generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing 11 can be closed by a cover plate to seal and isolate the internal environment of the battery 10 from the external environment.

[0024] For example, the material of the housing 11 can be one or more of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and aluminum-plastic film, and the present invention does not impose any particular limitation on it.

[0025] A battery cell is the component in a battery 10 where electrochemical reactions occur, and it is also the smallest unit in the battery 10 capable of performing electrochemical reactions such as charging or discharging. A battery cell typically includes a positive electrode, a negative electrode, and a separator. As an example, a battery cell can be a lithium-ion battery cell, which operates by relying on the insertion and extraction of lithium ions between the positive and negative electrode plates.

[0026] It is understandable that battery cells can be implemented in various ways. For example, a battery cell can be formed by winding a positive electrode, a separator, and a negative electrode to form a cylindrical battery cell. Another example is that a battery cell can be formed by winding or stacking a positive electrode, a separator, and a negative electrode to form a battery cell with a roughly rectangular shape.

[0027] In the current embodiment, the battery cell is rectangular in shape, and the housing 11 is a rectangular hard shell to accommodate the battery cell.

[0028] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- can be used to indicate opposite sides in the up and down direction; arrows X+ and X- can be used to indicate opposite sides in the first direction; arrows Y+ and Y- can be used to indicate opposite sides in the second direction, and the first direction, the second direction, and the up and down direction are perpendicular to each other.

[0029] Continue to refer to Figure 3The bottom end face 12 of the housing 11 is provided with two explosion-proof valves 13 spaced apart in a first direction. The explosion-proof valve 13 refers to an element or component that can be actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery 10 reaches a predetermined threshold. During the use of the battery 10, the explosion-proof valve 13 is mainly used to allow the gas inside the battery 10 to be discharged in order to reduce the internal pressure of the battery 10 in order to prevent the battery from deforming or exploding due to excessive increase in internal pressure when the battery 10 experiences thermal runaway or other situations.

[0030] It is understood that this utility model does not impose any special restrictions on the material of the explosion-proof valve 13. As an example, the explosion-proof valve 13 can be made of aluminum, steel, or an alloy.

[0031] It is understood that the present invention does not impose any particular restrictions on the shape of the explosion-proof valve 13. For example, the shape of the explosion-proof valve 13 can be one of square, oblong, elliptical and racetrack shape.

[0032] It is understood that this utility model does not impose any special restrictions on the type of explosion-proof valve 13. For example, the explosion-proof valve 13 can be a grooved explosion-proof valve, or it can be formed by stamping or laser etching.

[0033] <Example Battery Pack> refer to Figure 1 and Figure 2 A battery pack 100 is shown. Exemplarily, the battery pack 100 serves as a power source for new energy vehicles, acting as a rechargeable battery. The battery pack 100 includes a battery group composed of multiple batteries 10 connected in series and / or parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. Exemplarily, the casing can be divided into upper and lower parts, which are sealed together.

[0034] In some embodiments, the battery pack 100 further includes an isolation plate. Both the battery pack and the isolation plate are located in the housing. The isolation plate is located on the side of the battery pack away from the bottom wall of the housing, separating the battery pack from other devices located above the battery pack, thus serving as an isolation device.

[0035] Battery 10 faces different performance and safety challenges under different temperature environments. For example, at low temperatures, the electrochemical reaction rate inside Battery 10 decreases significantly, which can easily lead to capacity decay, increased internal resistance, and reduced power output, and in severe cases, even failure to function properly. At high temperatures or during intense charging and discharging, Battery 10 generates a large amount of heat. If heat dissipation is not timely or uneven, it may cause local overheating, leading to safety hazards such as thermal runaway.

[0036] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 3 The battery pack 100 also includes a heat exchanger 20, which is used to dissipate heat from the battery 10 to regulate the temperature of the battery 10.

[0037] As one possible implementation, the heat exchanger 20 can be a cold plate 20, which can be constructed as a liquid-cooled plate or a phase-change cold plate, and is thermally connected to the battery 10. A refrigerant can be stored inside the cold plate 20, and cooling of the battery 10 is achieved through the phase change of the refrigerant.

[0038] It is understandable that the refrigerant can be gas, solid, or liquid. Liquid refrigerants can also contain liquids with high specific heat capacity, such as water, as coolants to achieve liquid cooling of the battery 10.

[0039] As an example, the heat exchanger 20 can be an air-cooled plate, located at the bottom of the housing, i.e., connected to the bottom of the side wall to form a sealed housing structure. The air-cooled plate can be fixed to the side wall of the housing using nuts or other methods. In order to form an airflow cavity inside the housing, the bottom plate is set inside the barrel-shaped structure. Since the bottom of the battery is flat, the bottom plate also needs to be set parallel to the air-cooled plate, with a gap between the air-cooled plate and the bottom plate, so that the bottom plate, side wall, and air-cooled plate together form an airflow cavity.

[0040] As another example, the heat exchanger 20 can be a liquid-cooled plate 20, which has liquid-cooled channels within it. Optionally, the liquid-cooled plate also includes an inlet and an outlet, both of which are connected to a current collector for the inlet and outlet of the heat exchange medium. The liquid-cooled plate 20 can be made of a material with a certain hardness and strength (such as stainless steel), so that the liquid-cooled plate 20 is not easily deformed when the battery cell is subjected to compression or impact, which can enable the battery cell to have higher structural strength and improve safety performance.

[0041] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped. It is understandable that the liquid cooling plate 20 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy. The liquid cooling plate 20 can also be made of nylon, plastic, etc.

[0042] In the current embodiment, reference Figures 1 to 4 Multiple batteries 10 are arranged along a second direction. The heat exchanger 20 includes a heat exchange channel 21 extending along the second direction. The heat exchange channel 21 and the bottom end face 12 are located on the same side of the housing 11 in the vertical direction and are located between two explosion-proof valves 13. By arranging the two explosion-proof valves 13 at intervals along a first direction, a large area is formed between the two explosion-proof valves 13, which can provide ample space for the arrangement of the heat exchange channel 21. This allows the size of the heat exchange channel 21 in the first direction to be increased without affecting the normal operation of the explosion-proof valves 13. This implementation helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the heat exchange performance of the heat exchanger 20.

[0043] refer to Figure 4 In the first direction, the size of the heat exchange channel 21 is L in mm, and the size of the bottom end face 12 of the battery 10 is W1 in mm, where 0.7 ≤ L / W1 ≤ 0.9. For example, L / W1 can be 0.7, 0.72, 0.75, 0.78, 0.8, 0.83, 0.86 or 0.9.

[0044] If the ratio of the dimension of the heat exchange channel 21 in the first direction to the dimension of the bottom surface 12 in the first direction is too small, i.e., less than 0.7, the dimension of the heat exchange channel 21 in the first direction is small. Therefore, the heat exchange area between the heat exchange channel 21 and the bottom surface 12 of the battery 10 is small, which will result in poor heat exchange effect of the heat exchange component 20. If the ratio of the dimension of the heat exchange channel 21 in the first direction to the dimension of the bottom surface 12 in the first direction is too large, i.e., greater than 0.9, the dimension of the heat exchange channel 21 in the first direction is large. This will occupy more space on the bottom surface 12 of the battery 10, compressing the arrangement area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 is insufficient, and it cannot release the internal pressure or temperature in time, which can easily lead to deformation or even explosion of the battery 10, thus causing serious safety hazards.

[0045] According to the battery pack 100 provided by this utility model, the ratio of the size of the heat exchange channel 21 in the first direction to the size of the bottom end face 12 in the first direction is limited to the above-mentioned numerical range. This can ensure the heat exchange area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, and can also reduce the arrangement area of ​​the explosion-proof valve 13, thereby ensuring the pressure relief capacity of the explosion-proof valve 13.

[0046] Continue to refer to Figure 4 In the first direction, the dimension of the heat exchange channel 21 is L, in mm, where 120mm≤L≤350mm. For example, L can be 120mm, 150mm, 180mm, 210mm, 240mm, 280mm, 320mm or 350mm.

[0047] If the heat exchange channel 21 has a small dimension in the first direction, i.e., less than 120 mm, the heat exchange area between the heat exchange channel 21 and the bottom surface 12 of the battery 10 is too small, resulting in poor heat exchange performance of the heat exchange element 20. If the heat exchange channel 21 has a small dimension in the first direction, i.e., greater than 350 mm, it will occupy more space on the bottom surface 12 of the battery 10, compressing the arrangement area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 is insufficient, and it cannot release the internal pressure or temperature in time, which can easily lead to deformation or even explosion of the battery 10, thus posing a serious safety hazard.

[0048] According to the battery pack 100 provided by this utility model, the size of the heat exchange channel 21 in the first direction is limited to the above-mentioned numerical range, which can ensure the heat exchange area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, and can also reduce the arrangement area of ​​the explosion-proof valve 13, thereby ensuring the pressure relief capacity of the explosion-proof valve 13.

[0049] Continue to refer to Figure 4 In the first direction, the dimension of the bottom end face 12 of the battery 10 is W1, in mm, where 145mm ≤ W1 ≤ 400 mm. For example, W1 can be 145mm, 180mm, 210mm, 240mm, 280mm, 320mm, 360mm or 400mm.

[0050] If the bottom surface 12 of the battery 10 is too small in the first direction, i.e., less than 145 mm, the heat exchange channel 21 will also be small in the first direction. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchange element 20. If the bottom surface 12 of the battery 10 is too large in the first direction, i.e., greater than 400 mm, it will be detrimental to the heat dissipation of the battery 10. Specifically, the central area of ​​the battery 10 in the first direction is farther from the heat dissipation surface, and heat is more likely to accumulate, thereby increasing the risk of local overheating of the battery pack 100.

[0051] According to the battery pack 100 provided by this utility model, the size of the bottom end face 12 of the battery 10 in the first direction is limited to the above-mentioned numerical range, which can ensure the arrangement space of the heat exchange channel 21 in the first direction without increasing the risk of local overheating of the battery pack 100.

[0052] Continue to refer to Figure 4In the first direction, the minimum distance from the explosion-proof valve 13 to the heat exchange channel 21 is D1, in mm, and the dimension of the bottom end face 12 of the battery 10 is W1, in mm, where 0.03 ≤ D1 / W1 ≤ 0.09. For example, D1 / W1 can be 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.07, 0.08, or 0.09.

[0053] If the ratio of the minimum distance from the explosion-proof valve 13 to the heat exchange channel 21 along the first direction to the dimension of the bottom end face 12 in the first direction is too small, i.e., less than 0.03, the distance between the heat exchange channel 21 and the explosion-proof valve 13 will be small, which will result in a smaller allowable error during processing and increased manufacturing difficulty. If the ratio of the minimum distance from the explosion-proof valve 13 to the heat exchange channel 21 along the first direction to the dimension of the bottom end face 12 in the first direction is too large, i.e., greater than 0.09, the distance between the heat exchange channel 21 and the explosion-proof valve 13 in the first direction will be large. In this case, the arrangement space reserved for the heat exchange channel 21 by the two explosion-proof valves 13 in the first direction will not be fully utilized, resulting in low space utilization.

[0054] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance of the explosion-proof valve 13 to the heat exchange channel 21 along the first direction to the dimension of the bottom end face 12 in the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the heat exchange channel 21 by the two explosion-proof valves 13 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0055] Continue to refer to Figure 4 In the first direction, the minimum distance from the explosion-proof valve 13 to the heat exchange channel 21 is D1, in mm, where 10 mm ≤ D1 ≤ 30 mm. For example, D1 can be 10 mm, 12 mm, 14 mm, 16 mm, 19 mm, 22 mm, 25 mm, or 30 mm.

[0056] If the minimum distance between the explosion-proof valve 13 and the heat exchange channel 21 along the first direction is too small, i.e. less than 10 mm, this will result in a smaller allowable error during processing and increased manufacturing difficulty. If the minimum distance between the explosion-proof valve 13 and the heat exchange channel 21 along the first direction is too large, i.e. greater than 30 mm, the space reserved for the two explosion-proof valves 13 in the first direction for the heat exchange channel 21 will not be fully utilized, resulting in low space utilization.

[0057] According to the battery pack 100 provided by this utility model, the minimum distance from the explosion-proof valve 13 to the heat exchange channel 21 along the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the heat exchange channel 21 by the two explosion-proof valves 13 in the first direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0058] Continue to refer to Figure 4 In the first direction, the minimum distance between the explosion-proof valve 13 and the edge of the bottom end face 12 is D2, in mm, and the dimension of the bottom end face 12 of the battery 10 is W1, in mm, where 0.028 ≤ D2 / W1 ≤ 0.09. For example, D2 / W1 can be 0.028, 0.032, 0.036, 0.04, 0.045, 0.05, 0.06, 0.07, 0.08, or 0.09.

[0059] If the ratio of the minimum distance between the explosion-proof valve 13 and the edge of the bottom end face 12 along the first direction to the dimension of the bottom end face 12 in the first direction is too small, i.e., less than 0.028, then the distance between the explosion-proof valve 13 and the edge of the bottom end face 12 near the outer side is too small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the ratio of the minimum distance between the explosion-proof valve 13 and the edge of the bottom end face 12 along the first direction to the dimension of the bottom end face 12 in the first direction is too large, i.e., greater than 0.09, then the distance between the two explosion-proof valves 13 along the first direction is small, which will compress the arrangement space of the heat exchange channel 21, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0060] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance of the explosion-proof valve 13 to the edge of the bottom end face 12 along the first direction to the size of the bottom end face 12 in the first direction is limited to the above-mentioned numerical range. This not only allows sufficient space to be reserved for the heat exchange channel 21 in the first direction, but also reduces the mechanical strength of the edge area of ​​the shell 11.

[0061] Continue to refer to Figure 4 In the first direction, the minimum distance between the edge of the explosion-proof valve 13 and the bottom face 12 is D2, in mm, where 5mm ≤ D2 ≤ 20mm. For example, D2 can be 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 16mm, 18mm or 20mm.

[0062] If the minimum distance between the explosion-proof valve 13 and the edge of the bottom face 12 along the first direction is too small, i.e., less than 5 mm, the distance between the explosion-proof valve 13 and the edge of the bottom face 12 near the outer side will be too small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the minimum distance between the explosion-proof valve 13 and the edge of the bottom face 12 along the first direction is too large, i.e., greater than 20 mm, the spacing between the two explosion-proof valves 13 along the first direction will be small, which will compress the arrangement space of the heat exchange channel 21, thereby reducing the contact area between the heat exchange channel 21 and the bottom face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0063] According to the battery pack 100 provided by this utility model, the minimum distance of the explosion-proof valve 13 along the first direction to the edge of the bottom surface 12 is limited to the above-mentioned numerical range. This ensures that sufficient arrangement space is reserved for the heat exchange channel 21 in the first direction, and also reduces the mechanical strength of the edge area of ​​the shell 11.

[0064] Continue to refer to Figure 4 In the second direction, the minimum distance between the explosion-proof valve 13 and the edge of the bottom end face 12 is D3, in mm, and the dimension of the bottom end face 12 of the battery 10 is W2, in mm, where 0.1 ≤ D3 / W2 ≤ 0.4. For example, D3 / W2 can be 0.1, 0.12, 0.15, 0.18, 0.22, 0.27, 0.33, or 0.4.

[0065] If the ratio of the minimum distance between the explosion-proof valve 13 and the edge of the bottom face 12 along the second direction to the dimension of the bottom face 12 in the second direction is too small (less than 0.1), the distance between the explosion-proof valve 13 and the edge of the bottom face 12 near the outer side is too small, which weakens the mechanical strength of the edge area of ​​the housing 11. If the ratio of the minimum distance between the explosion-proof valve 13 and the edge of the bottom face 12 along the second direction to the dimension of the bottom face 12 in the second direction is too large (greater than 0.4), the dimension of the explosion-proof valve 13 in the second direction is small, resulting in a small area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 is insufficient, and it cannot release the internal pressure or temperature in time, which can easily cause the battery 10 to deform or even explode, thus posing a serious safety hazard.

[0066] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance between the explosion-proof valve 13 and the edge of the bottom end face 12 along the second direction to the size of the bottom end face 12 in the second direction is limited to the above-mentioned numerical range. This allows the two explosion-proof valves 13 to obtain sufficient area, thereby ensuring the pressure relief capacity of the explosion-proof valves 13, while also reducing the mechanical strength of the edge area of ​​the housing 11.

[0067] Continue to refer to Figure 4 In the second direction, the dimension of the bottom end face 12 of the battery 10 is W2, in mm, where 25mm ≤ W2 ≤ 60mm. For example, W2 can be 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 42mm, 46mm, 50mm or 60mm.

[0068] If the bottom surface 12 of the battery 10 is too small in the second direction, i.e., less than 25 mm, this will limit the arrangement area of ​​the compression explosion-proof valve 13. If the bottom surface 12 of the battery 10 is too large in the second direction, i.e., greater than 60 mm, it will be detrimental to the heat dissipation of the battery 10. Specifically, the central area of ​​the battery 10 in the second direction is farther from the heat dissipation surface, and heat is more likely to accumulate, thereby increasing the risk of local overheating of the battery pack 100.

[0069] According to the battery pack 100 provided by this utility model, the size of the bottom end face 12 of the battery 10 in the second direction is limited to the above-mentioned numerical range, which can ensure the arrangement area of ​​the explosion-proof valve 13 without increasing the risk of local overheating of the battery pack 100.

[0070] Continue to refer to Figure 4 In the second direction, the minimum distance between the explosion-proof valve 13 and the edge of the bottom face 12 is D3, in mm, where 3mm ≤ D3 ≤ 10mm. For example, D3 can be 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm or 8mm.

[0071] If the minimum distance of the explosion-proof valve 13 along the second direction to the edge of the bottom face 12 is too small, i.e., less than 3 mm, then the distance of the explosion-proof valve 13 to the edge of the bottom face 12 near the outer side is too small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the minimum distance of the explosion-proof valve 13 along the second direction to the edge of the bottom face 12 is too large, i.e., greater than 10 mm, then the size of the explosion-proof valve 13 in the second direction is small, resulting in a small area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 is insufficient, and it cannot release the internal pressure or temperature in time, which can easily cause the battery 10 to deform or even explode, thus posing a serious safety hazard.

[0072] According to the battery pack 100 provided by this utility model, the minimum distance of the explosion-proof valve 13 along the second direction to the edge of the bottom surface 12 is limited to the above-mentioned numerical range. This not only allows the two explosion-proof valves 13 to obtain sufficient area, thereby ensuring the pressure relief capacity of the explosion-proof valves 13, but also reduces the mechanical strength of the edge area of ​​the housing 11.

[0073] refer to Figure 6The heat exchange channel 21 includes an upper end plate 22 and a lower end plate 23 in the vertical direction. The upper end plate 22 is closer to the bottom end surface 12 of the battery 10 than the lower end plate 23. The lower end plate 23 includes a plurality of recesses 24, which protrude from the lower end plate 23 to the upper end plate 22. According to the battery pack 100 provided by this utility model, by constructing a plurality of recesses 24 on the lower end plate 23, the structural stability of the entire heat exchange channel 21 can be enhanced, thereby improving the mechanical strength and compressive strength of the heat exchange component 20 and preventing the heat exchange channel 21 from deforming due to pressure.

[0074] refer to Figure 5 The plurality of recesses 24 include a first recess 241 and a second recess 242 spaced apart along a first direction. The heat exchange channel 21 is divided into a first sub-channel 211, a second sub-channel 212, and a third sub-channel 213 by the first recesses 241 and the second recesses 242. Compared to the undivided heat exchange channel 21, the dimensions of the divided first sub-channel 211, second sub-channel 212, and third sub-channel 213 are all reduced in the first direction, thereby increasing the flow velocity of the fluid medium in the first sub-channel 211, second sub-channel 212, and third sub-channel 213, thereby improving the heat exchange efficiency of the heat exchanger 20.

[0075] Continue to refer to Figure 5 In the first direction, the size of the first sub-channel 211 is L1 in mm, and the size of the second sub-channel 212 is L2 in mm, where L2 ≥ L1.

[0076] If the dimension of the second sub-channel 212 in the first direction is smaller than the dimension of the first sub-channel 211 in the first direction, the flow resistance of the second sub-channel 212 will be larger. This may cause the heat exchange medium to bypass the second sub-channel 212 and preferentially flow to the first sub-channel 211 when flowing in the heat exchange channel 21, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10 and affecting the heat exchange effect. The battery pack 100 provided by this utility model ensures that the heat exchange medium passes through the second sub-channel 212 when flowing in the heat exchange channel 21 by setting the dimension of the second sub-channel 212 in the first direction to be greater than or equal to the dimension of the first sub-channel 211 in the first direction, thereby ensuring the effective heat exchange area of ​​the heat exchange channel 21.

[0077] Continue to refer to Figure 5 In the first direction, the size of the first sub-channel 211 is L1 in mm, and the size of the second sub-channel 212 is L2 in mm, where 1 ≤ L2 / L1 ≤ 5. For example, L2 / L1 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, or 5.

[0078] If the ratio of the dimension of the second sub-channel 212 in the first direction to the dimension of the first sub-channel 211 in the first direction is too small, i.e., less than 1, this may cause the heat exchange medium to bypass the second sub-channel 212 and preferentially flow to the first sub-channel 211 when flowing in the heat exchange channel 21, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10 and affecting the heat exchange effect. If the ratio of the dimension of the second sub-channel 212 in the first direction to the dimension of the first sub-channel 211 in the first direction is too large, i.e., greater than 5, then the dimension of the first sub-channel 211 in the first direction is small, which will increase the flow resistance of the first sub-channel 211, thereby reducing the flow rate of the heat exchange medium through the first sub-channel 211 when flowing in the heat exchange channel 21.

[0079] The battery pack 100 provided by this utility model limits the ratio of the size of the second sub-channel 212 in the first direction to the size of the first sub-channel 211 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the first sub-channel 211 and the second sub-channel 212 when it flows in the heat exchange channel 21, thus ensuring the heat exchange effect.

[0080] As one possible implementation, in the first direction, the size of the first sub-channel 211 is L1, in mm, where 8 mm ≤ L1 ≤ 40 mm. For example, L1 can be 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 19 mm, 22 mm, 26 mm, 32 mm, or 40 mm.

[0081] If the dimension of the first sub-channel 211 in the first direction is too small, i.e. less than 8 mm, the dimension of the first sub-channel 211 in the first direction is small, which will increase the flow resistance of the first sub-channel 211, thereby reducing the flow rate of the heat exchange medium through the first sub-channel 211 when flowing in the heat exchange channel 21. If the dimension of the first sub-channel 211 in the first direction is too large, i.e. greater than 40 mm, this will limit the dimension of the recess 24 in the first direction, thereby weakening the mechanical strength and compressive strength of the heat exchange element 20.

[0082] The battery pack 100 provided by this utility model limits the size of the first sub-channel 211 in the first direction to the above-mentioned numerical range, which can ensure the flow rate of the heat exchange medium through the first sub-channel 211 when it flows in the heat exchange channel 21, and also ensure the mechanical strength and pressure resistance of the heat exchange component 20, and prevent it from deforming due to pressure.

[0083] As one possible implementation, in the first direction, the size of the second sub-channel 212 is L2, in mm, where 10mm ≤ L2 ≤ 45mm. For example, L2 can be 10mm, 12mm, 14mm, 16mm, 19mm, 22mm, 26mm, 30mm, 36mm, 42mm, or 45mm.

[0084] If the dimension of the second sub-channel 212 in the first direction is too small, i.e., less than 10 mm, the dimension of the second sub-channel 212 in the first direction is small, which will increase the flow resistance of the second sub-channel 212, thereby reducing the flow rate of the heat exchange medium flowing in the heat exchange channel 21 through the second sub-channel 212. If the dimension of the second sub-channel 212 in the first direction is too large, i.e., greater than 45 mm, this will compress the dimension of the recess 24 in the first direction, thereby weakening the mechanical strength and compressive strength of the heat exchange element 20.

[0085] The battery pack 100 provided by this utility model limits the size of the second sub-channel 212 in the first direction to the above-mentioned numerical range, which can ensure the flow rate of the heat exchange medium through the second sub-channel 212 when it flows in the heat exchange channel 21, and also ensure the mechanical strength and pressure resistance of the heat exchange component 20, and prevent it from deforming due to pressure.

[0086] Continue to refer to Figure 5 In the first direction, the size of the second sub-channel 212 is L2 in mm, and the size of the third sub-channel 213 is L3 in mm, where L2 ≥ L3.

[0087] If the dimension of the second sub-channel 212 in the first direction is smaller than the dimension of the third sub-channel 213 in the third direction, the heat exchange medium will bypass the second sub-channel 212 and preferentially flow to the third sub-channel 213 when flowing in the heat exchange channel 21. This reduces the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, affecting the heat exchange effect. The battery pack 100 provided by this utility model, by setting the dimension of the second sub-channel 212 in the third direction to be greater than or equal to the dimension of the third sub-channel 213 in the third direction, can ensure that the heat exchange medium flows through the second sub-channel 212 when flowing in the heat exchange channel 21, thereby ensuring the heat exchange area of ​​the heat exchange channel 21.

[0088] Continue to refer to Figure 5 In the first direction, the size of the second sub-channel 212 is L2 in mm, and the size of the third sub-channel 213 is L3 in mm, where 1 ≤ L2 / L3 ≤ 5. For example, L2 / L3 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, or 5.

[0089] If the ratio of the dimension of the second sub-channel 212 to the dimension of the third sub-channel 213 in the first direction is too small (less than 1), the heat exchange medium may bypass the second sub-channel 212 and preferentially flow to the third sub-channel 213 when flowing in the heat exchange channel 21. This will reduce the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, thus affecting the heat exchange effect. If the ratio of the dimension of the second sub-channel 212 to the dimension of the third sub-channel 213 in the first direction is too large (greater than 5), the dimension of the third sub-channel 213 in the first direction will be small. This will increase the flow resistance of the third sub-channel 213, thereby reducing the flow rate of the heat exchange medium through the third sub-channel 213 when flowing in the heat exchange channel 21.

[0090] The battery pack 100 provided by this utility model limits the ratio of the size of the second sub-channel 212 in the first direction to the size of the third sub-channel 213 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the third sub-channel 213 and the second sub-channel 212 when it flows in the heat exchange channel 21, thereby ensuring the heat exchange effect.

[0091] As one possible implementation, in the first direction, the dimension of the third sub-channel 213 is L3, in mm, where 8 mm ≤ L3 ≤ 40 mm. For example, L3 can be 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 19 mm, 22 mm, 26 mm, 32 mm, or 40 mm.

[0092] If the dimension of the third sub-channel 213 in the first direction is too small, i.e., less than 8 mm, the dimension of the third sub-channel 213 in the first direction is small, which will increase the flow resistance of the third sub-channel 213, thereby reducing the flow rate of the heat exchange medium through the third sub-channel 213 when flowing in the heat exchange channel 21. If the dimension of the third sub-channel 213 in the first direction is too large, i.e., greater than 40 mm, this will compress the dimension of the recess 24 in the first direction, thereby weakening the mechanical strength and compressive strength of the heat exchange element 20.

[0093] The battery pack 100 provided by this utility model limits the size of the third sub-channel 213 in the first direction to the above-mentioned numerical range, which can ensure the flow rate of the heat exchange medium through the third sub-channel 213 when it flows in the heat exchange channel 21, and also ensure the mechanical strength and pressure resistance of the heat exchange component 20, and prevent it from deforming due to pressure.

[0094] As one possible implementation, the orthographic projection area of ​​the multiple recesses 24 along the vertical direction is A1, in mm. 2 The projected area of ​​the heat exchange channel 21 along the vertical direction is A2, in mm. 20.3≤A1 / A2≤0.6. For example, A1 / A2 can be 0.3, 0.33, 0.36, 0.4, 0.45, 0.5, 0.55 or 0.6.

[0095] If the ratio of the projected area of ​​the multiple recesses 24 along the vertical direction to the projected area of ​​the heat exchange channel 21 along the vertical direction is too small, i.e., less than 0.3, the structural stability of the heat exchange channel 21 is poor, and the heat exchange channel 21 is prone to deformation under pressure. If the ratio of the projected area of ​​the multiple recesses 24 along the vertical direction to the projected area of ​​the heat exchange channel 21 along the vertical direction is too large, i.e., greater than 0.6, the heat exchange area between the heat exchange medium and the bottom surface 12 of the battery 10 is small, which will lead to poor heat exchange effect.

[0096] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the plurality of recesses 24 in the vertical direction to the projected area of ​​the heat exchange channel 21 in the vertical direction is limited to the above-mentioned numerical range. This can ensure both the structural stability of the heat exchange component 20 and the contact area between the heat exchange medium and the bottom end surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20.

[0097] refer to Figure 2 In the first direction, the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 is D4, in mm, and the size of battery 10 is W1, in mm, where 0.08 ≤ D4 / W1 ≤ 0.1. For example, D4 / W1 can be 0.08, 0.082, 0.084, 0.086, 0.088, 0.092, 0.096, or 0.1.

[0098] If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too small, i.e., less than 0.08, then after the explosion-proof valve 13 of one battery 10 is actuated, the gas released from the housing 11 may impact the explosion-proof valve 13 of the other battery 10, causing it to be actuated unexpectedly. If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too large, i.e., greater than 0.1, then the arrangement space of the heat exchange channel 21 in the first direction will be compressed, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0099] The battery pack 100 provided by this utility model limits the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the size of the battery 10 in the first direction to the above-mentioned numerical range. This can ensure the arrangement space of the heat exchange channel 21 in the first direction and effectively reduce the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when one of them bursts, thereby improving the safety of the battery pack 100.

[0100] As one possible implementation, in the first direction, the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 is D4, in mm, where 12 mm ≤ D4 ≤ 45 mm. For example, D4 ​​can be 12 mm, 14 mm, 16 mm, 18 mm, 21 mm, 24 mm, 28 mm, 32 mm, 38 mm, or 45 mm.

[0101] If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too small, i.e., less than 12mm, the gas released from the housing 11 after the explosion-proof valve 13 of one battery 10 is activated may impact the explosion-proof valve 13 of the other battery 10, causing it to be activated unexpectedly. If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too large, i.e., greater than 45mm, it will compress the arrangement space of the heat exchange channel 21 in the first direction, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0102] The battery pack 100 provided by this utility model limits the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the above-mentioned numerical range. This not only ensures the arrangement space of the heat exchange channel 21 in the first direction, but also effectively reduces the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when it bursts, thereby improving the safety of the battery pack 100.

[0103] As one possible implementation, the projected area of ​​the two explosion-proof valves 13 along the vertical direction is A3, in mm. 2 The projected area of ​​one of the multiple batteries 10 along the vertical direction is A4, in mm. 2 0.1 ≤ A3 / A4 ≤ 0.3. For example, A3 / A4 can be 0.1, 0.12, 0.14, 0.16, 0.18, 0.22, 0.26 or 0.3.

[0104] If the ratio of the vertical projection area of ​​the two explosion-proof valves 13 to the vertical projection area of ​​one of the batteries 10 is too small (less than 0.1), the pressure relief capacity of the explosion-proof valves 13 is insufficient. When the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the explosion-proof valves 13 cannot release the internal pressure or temperature in time, which can easily lead to deformation or even explosion of the battery 10, thus causing serious safety hazards. If the ratio of the vertical projection area of ​​the two explosion-proof valves 13 to the vertical projection area of ​​one of the batteries 10 is too large (greater than 0.3), the arrangement space of the heat exchange channel 21 in the first direction will be compressed, reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is detrimental to the heat exchange effect of the heat exchange element 20.

[0105] According to the battery pack 100 provided by this utility model, the ratio of the orthogonal projection area of ​​the two explosion-proof valves 13 in the vertical direction to the orthogonal projection area of ​​one of the multiple batteries 10 in the vertical direction is limited to the above-mentioned numerical range. This ensures that the two explosion-proof valves 13 have sufficient area to ensure the pressure relief capacity of the explosion-proof valves 13, and also ensures the arrangement space of the heat exchange channel 21 in the first direction.

[0106] As one possible implementation, the projected area of ​​the two explosion-proof valves 13 along the vertical direction is A3, in mm. 2 400mm 2 ≤A3≤1400mm 2 For example, A3 can be 400mm. 2 450mm 2 500mm 2 600mm 2 700mm 2 800 mm 2 900 mm 2 1000 mm 2 1200 mm 2 Or 1400 mm 2 .

[0107] If the projected area of ​​the two explosion-proof valves 13 in the vertical direction is too small, i.e. less than 400mm² 2 If the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the explosion-proof valve 13 will be unable to release the internal pressure or temperature in time, which may easily cause the battery 10 to deform or even explode, thus posing a serious safety hazard. If the projected area of ​​the two explosion-proof valves 13 in the vertical direction is too large, i.e. greater than 1400 mm², the explosion-proof valve 13 will also be affected. 2 This will compress the arrangement space of the heat exchange channel 21 in the first direction and reduce the contact area between the heat exchange channel 21 and the bottom surface 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange component 20.

[0108] According to the battery pack 100 provided by this utility model, the projected area of ​​the two explosion-proof valves 13 in the vertical direction is limited to the above-mentioned numerical range, which can ensure that the two explosion-proof valves 13 have sufficient area to ensure the pressure relief capacity of the explosion-proof valves 13, and also ensure the arrangement space of the heat exchange channel 21 in the first direction.

[0109] <Example Electrical Equipment> refer to Figure 7 This utility model provides an electrical device 200, which includes a battery pack 100.

[0110] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0111] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0112] In a non-restrictive example, refer to Figure 7 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0113] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0114] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first recess and the second recess), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0115] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: A plurality of batteries (10), each battery (10) including a housing (11), the bottom end face (12) of the housing (11) having two explosion-proof valves (13) spaced apart in a first direction, the plurality of batteries (10) arranged along a second direction; and The heat exchanger (20) includes a heat exchange channel (21) extending along a second direction. The heat exchange channel (21) and the bottom end face (12) are located on the same side of the battery (10) in the vertical direction and between the two explosion-proof valves (13). The vertical direction, the first direction and the second direction are perpendicular to each other.

2. The battery pack (100) according to claim 1, characterized in that, In the first direction, the size of the heat exchange channel (21) is L in mm, and the size of the bottom end face (12) is W1 in mm, 0.7≤L / W1≤0.

9.

3. The battery pack (100) according to claim 2, characterized in that, In the first direction, the size of the heat exchange channel (21) is L, in mm, 120mm≤L≤350mm.

4. The battery pack (100) according to claim 2, characterized in that, In the first direction, the dimension of the bottom end face (12) is W1, in mm, 145mm≤W1≤400mm.

5. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the explosion-proof valve (13) to the heat exchange channel (21) is D1, in mm, and the size of the bottom end face (12) is W1, in mm, 0.03≤D1 / W1≤0.

09.

6. The battery pack (100) according to claim 5, characterized in that, In the first direction, the minimum distance from the explosion-proof valve (13) to the heat exchange channel (21) is D1, in mm, where 10mm≤D1≤30mm.

7. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the explosion-proof valve (13) to the edge of the bottom end face (12) is D2, in mm, and the size of the bottom end face (12) is W1, in mm, 0.028≤D2 / W1≤0.

09.

8. The battery pack (100) according to claim 7, characterized in that, In the first direction, the minimum distance from the explosion-proof valve (13) to the edge of the bottom end face (12) is D2, in mm, where 5mm≤D2≤20mm.

9. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the explosion-proof valve (13) to the edge of the bottom end face (12) is D3, in mm, and the size of the bottom end face (12) is W2, in mm, 0.1≤D3 / W2≤0.

4.

10. The battery pack (100) according to claim 9, characterized in that, In the second direction, the dimension of the bottom end face (12) is W2, in mm, 25mm≤W2≤60mm.

11. The battery pack (100) according to claim 9, characterized in that, In the second direction, the minimum distance from the explosion-proof valve (13) to the edge of the bottom end face (12) is D3, in mm, where 3mm≤D3≤10mm.

12. The battery pack (100) according to claim 1, characterized in that, The heat exchange channel (21) includes an upper end plate (22) and a lower end plate (23) in the vertical direction. The upper end plate (22) is closer to the bottom end face (12) of the battery (10) than the lower end plate (23). The lower end plate (23) includes a plurality of recesses (24) that protrude from the lower end plate (23) toward the upper end plate (22).

13. The battery pack (100) according to claim 12, characterized in that, The plurality of batteries (10) includes two rows of batteries (10) arranged along the first direction. In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4 in mm. The size of the bottom end face (12) is W1 in mm, and 0.08≤D4 / W1≤0.

1.

14. The battery pack (100) according to claim 13, characterized in that, In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4, in mm, where 12mm≤D4≤45mm.

15. The battery pack (100) according to claim 12, characterized in that, The plurality of recesses (24) include a first recess (241) and a second recess (242) spaced apart along the first direction. The heat exchange channel (21) is divided into a first sub-channel (211), a second sub-channel (212) and a third sub-channel (213) by the first recess (241) and the second recess (242). In the first direction, the size of the first sub-channel (211) is L1 in mm, the size of the second sub-channel (212) is L2 in mm, and the size of the third sub-channel (213) is L3 in mm. L2 ≥ L1 and L2 ≥ L3.

16. The battery pack (100) according to claim 15, characterized in that, In the first direction, the size of the first sub-channel (211) is L1 in mm, and the size of the second sub-channel (212) is L2 in mm, where 1 ≤ L2 / L1 ≤ 5.

17. The battery pack (100) according to claim 15, characterized in that, In the first direction, the size of the second sub-channel (212) is L2 in mm, and the size of the third sub-channel (213) is L3 in mm, where 1 ≤ L2 / L3 ≤ 5.

18. The battery pack (100) according to claim 16, characterized in that, In the first direction, the size of the first sub-channel (211) is L1, in mm, where 8mm≤L1≤40mm.

19. The battery pack (100) according to claim 16 or 17, characterized in that, In the first direction, the size of the second sub-channel (212) is L2 in mm, where 10 mm ≤ L2 ≤ 45 mm.

20. The battery pack (100) according to claim 17, characterized in that, In the first direction, the dimension of the third sub-channel (213) is L3, in mm, where 8mm≤L3≤40mm.

21. The battery pack (100) according to claim 12, characterized in that, The projected area of ​​the plurality of recesses (24) along the vertical direction is A1, in mm. 2 The projected area of ​​the heat exchange channel (21) along the vertical direction is A2, in mm. 2 , 0.3≤A1 / A2≤0.

6.

22. The battery pack (100) according to claim 1, characterized in that, The projected area of ​​the two explosion-proof valves (13) along the vertical direction is A3, in mm. 2 The projected area of ​​one of the plurality of batteries (10) along the vertical direction is A4, in mm. 2 , 0.1≤A3 / A4≤0.

3.

23. The battery pack (100) according to claim 22, characterized in that, The projected area of ​​the two explosion-proof valves (13) along the vertical direction is A3, in mm. 2 400 mm 2 ≤A3≤1400 mm 2 .

24. An electrical appliance (200), characterized in that, The battery pack (100) includes any one of claims 1 to 23.

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