Battery pack and electric device with same

Abstract

The utility model relates to a battery pack and electric equipment with same, and the battery pack includes a plurality of batteries and heat exchange parts, and the battery includes the casing with the explosion -proof valve of bottom surface, and the bottom surface includes two first edges spaced apart in the first direction and two second edges spaced apart in the second direction, the size of first edge is less than the size of second edge, and the first direction, the second direction and the up and down direction are perpendicular two by two. The heat exchange part includes a plurality of fluid channels extending along the first direction and a plurality of mounting holes spaced apart along the second direction, and the mounting hole is used for receiving the explosion -proof valve. The battery pack includes a plurality of pairs of batteries arranged along the second direction, at least a part of the fluid channel is located between two mounting holes of a pair of batteries, and in the second direction, the distance from the mounting hole to the second edge of the corresponding battery close to another battery is greater than the distance from the mounting hole to the second edge of the corresponding battery away from another battery, thereby increasing the spacing of two mounting holes, and providing abundant arrangement space for the fluid channel.

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] As a crucial component of devices such as electric vehicles and energy storage systems, the safety and reliability of battery packs are paramount. During actual operation, batteries generate significant heat during charging and discharging. Insufficient or uneven heat dissipation can easily lead to localized overheating, potentially causing thermal runaway. To address this, some battery packs are equipped with heat exchange components that come into contact with the battery to exchange heat and prevent safety risks such as thermal runaway caused by localized overheating.

[0003] In addition, battery casings are typically equipped with explosion-proof valves to release internal pressure. The presence of these valves restricts the fluid channel layout of the heat exchange components, thereby reducing the cross-sectional area of ​​the flow channels. This reduces the flow efficiency of the heat exchange medium and affects the overall heat exchange performance. Utility Model Content

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

[0005] The battery pack provided by this utility model includes multiple batteries and a heat exchanger. Each battery includes a housing with an explosion-proof valve on its bottom surface. The bottom surface includes two first edges spaced apart in a first direction and two second edges spaced apart in a second direction. The dimensions of the first edges are smaller than the dimensions of the second edges, and the first, second, and vertical directions are mutually perpendicular. The heat exchanger includes multiple fluid channels and multiple mounting holes. The fluid channels extend along the first direction, and the mounting holes are spaced apart along the second direction, receiving the explosion-proof valves of the multiple batteries. The battery pack includes multiple pairs of batteries arranged along the second direction. At least a portion of the fluid channels is located between two mounting holes corresponding to a pair of batteries. In the second direction, the distance from the mounting hole to the second edge of the corresponding battery closer to the other battery is D1 (in mm), and the distance from the mounting hole to the second edge of the corresponding battery farther from the other battery is D2 (in mm), where D1 > D2.

[0006] On the other hand, the present invention also provides an electrical device that includes the battery pack described in the first aspect.

[0007] The beneficial effects of the battery provided by this utility model are as follows: The distance from the mounting hole to the second edge of the corresponding cell that is closer to the other cell is greater than the distance from the second edge of the corresponding cell that is farther away from the other cell. This causes the two mounting holes to be offset toward the side away from the fluid channel, thereby increasing the spacing between the two mounting holes and providing more space for the fluid channel. This implementation helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the overall heat exchange performance of the heat exchanger. 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 schematic diagram of the battery pack structure.

[0014] Figure 3 yes Figure 1 A bottom view of the battery pack.

[0015] Figure 4 yes Figure 1 A schematic diagram of the battery structure in the battery pack.

[0016] Figure 5 yes Figure 3 A schematic diagram of a part of the structure.

[0017] Figure 6 yes Figure 3 A schematic diagram of a part of the structure.

[0018] Figure 7 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0019] Figure 8 yes Figure 3 A schematic diagram of a part of the structure.

[0020] Figure 9 This is a schematic diagram of a portion of a battery pack according to another embodiment of the present invention.

[0021] Figure 10 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0022] Reference numerals: Battery pack-100; Battery-10; First battery-101; Second battery-102; Housing-11; Bottom surface-12; First edge-121; Second edge-122; Explosion-proof valve-13; Heat exchanger-20; Fluid channel-21; Mounting hole-22; Wide section-23; First wide section-231; Second wide section-232; First plate-233; Second plate-234; Recess-25; First recess-251; Second recess-252; Third wide section-233; Narrow section-23; First narrow section-231; Second narrow section-232; Electrical equipment-200. Detailed Implementation

[0023] 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.

[0024] <Example Battery> Figure 4 A 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.

[0025] The battery 10 includes a casing 11 and a battery cell (not shown).

[0026] 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.

[0027] For example, the material of the housing 11 may 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.

[0028] A battery cell is the component in a battery where electrochemical reactions occur, and it is the smallest unit in a battery capable of carrying out electrochemical reactions such as charging or discharging. A battery cell typically consists of a positive electrode, a negative electrode, and a separator. As an example, a battery cell can be a lithium-ion cell, which operates by the intercalation and deintercalation of lithium ions between the positive and negative electrodes.

[0029] 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.

[0030] In the current embodiment, the battery cell is rectangular in shape, and the housing 11 is a rectangular rigid shell to house the battery cell. The bottom surface 12 of the housing 11 includes two first edges 121 spaced apart in a first direction and two second edges 122 spaced apart in a second direction, wherein the size of the first edges 121 is smaller than the size of the second edges 122.

[0031] 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.

[0032] Continue to refer to Figure 4 The bottom surface 12 of the housing 11 is provided with an explosion-proof valve 13. The explosion-proof valve 13 is a component or part that can be actuated to release 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 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 thermal runaway or other situations occur.

[0033] It is understood that this utility model does not impose any special restrictions on the material of the explosion-proof valve 13. For example, the explosion-proof valve 13 can be one of aluminum, steel, or alloy.

[0034] 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.

[0035] 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.

[0036] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment of the present invention includes a plurality of batteries 10. The plurality of batteries 10 can be connected in series or in parallel to form a battery pack.

[0037] refer to Figure 1 and Figure 2A 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In the current embodiment, reference Figure 2 and Figure 3 The heat exchanger 20 includes a plurality of fluid channels 21 and a plurality of mounting holes 22. The plurality of fluid channels 21 extend along a first direction, and the plurality of mounting holes 22 are spaced along a second direction and receive an explosion-proof valve 13 of one of the plurality of batteries 10.

[0047] refer to Figure 1 and Figure 5 The battery pack 100 includes multiple pairs of batteries 10 arranged along a second direction. At least a portion of the fluid channel 21 is located between two mounting holes 22 of a pair of batteries 10. The boundary of a pair of batteries 10 is shown in the figure by a dashed line. In the second direction, the distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 closer to the other battery 10 is D1 (in mm), and the distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 farther from the other battery 10 is D2 (in mm), where D1 > D2.

[0048] The distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 that is closer to the other battery 10 is greater than the distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 that is farther away from the other battery 10. This causes the two mounting holes 22 to be offset toward the side away from the fluid channel 21, thereby increasing the spacing between the two mounting holes 22 and providing more space for the fluid channel 21. This implementation helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the overall heat exchange performance of the heat exchanger 20.

[0049] As one possible implementation, in the second direction, the distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 closer to the other battery 10 is D1, in mm, and the distance from the mounting hole 22 to the second edge 122 of the corresponding battery 10 farther from the other battery 10 is D2, in mm, where 1 < D1 / D2 ≤ 7.5. For example, D1 / D2 can be 1.2, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, or 7.5.

[0050] If the ratio of the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 to the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is too small, i.e. less than or equal to 1, then the arrangement space of the fluid channel 21 in the second direction is small. 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 exchanger 20. If the ratio of the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 to the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is too large, i.e. greater than 7.5, then the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is too small. Therefore, the distance from the explosion-proof valve 13 along the second direction to the edge of the housing 11 is small, which will weaken the mechanical strength of the edge region of the housing 11.

[0051] According to the battery pack 100 provided by this utility model, the ratio of the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 to the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is limited to the above-mentioned numerical range. This ensures the arrangement space of the fluid channel 21 in the second direction and reduces the mechanical strength of the edge region of the housing 11.

[0052] As one possible implementation, the distance D1 from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 is given by the unit D1, where 6mm ≤ D1 ≤ 15mm. For example, D1 can be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm.

[0053] If the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 is too small, i.e. less than 6 mm, the arrangement space of the fluid channel 21 in the second direction will be small. 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 exchanger 20. If the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near the other battery 10 is too large, i.e. greater than 15 mm, the distance from the explosion-proof valve 13 to the edge of the housing 11 will be small. This will weaken the mechanical strength of the edge area of ​​the housing 11.

[0054] According to the battery pack 100 provided by this utility model, the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 near another battery 10 is limited to the above-mentioned numerical range, which can ensure the arrangement space of the fluid channel 21 in the second direction and reduce the mechanical strength of the edge area of ​​the housing 11.

[0055] As one possible implementation, the distance D2 from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is 2mm ≤ D2 ≤ 6mm. For example, D2 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm or 6mm.

[0056] If the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is too small, i.e. less than 2 mm, the distance from the explosion-proof valve 13 to the edge of the housing 11 will be small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is too large, i.e. greater than 6 mm, the arrangement space of the fluid channel 21 in the second direction will be small, which 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.

[0057] According to the battery pack 100 provided by this utility model, the distance from the mounting hole 22 along the second direction to the second edge 122 of the corresponding battery 10 away from the other battery 10 is limited to the above-mentioned numerical range, which can ensure the arrangement space of the fluid channel 21 in the second direction and reduce the mechanical strength of the edge region of the housing 11.

[0058] refer to Figure 5 In the second direction, the minimum distance from the mounting hole 22 to the fluid channel 21 is D3, in mm, and the dimension of the first edge 121 is W, in mm, where 0.083 ≤ D3 / W ≤ 0.6. For example, D3 / W can be 0.083, 0.09, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, or 0.6.

[0059] If the ratio of the minimum distance from the mounting hole 22 along the second direction to the fluid channel 21 to the dimension of the first edge 121 in the second direction is too small (less than 0.083), the distance between the fluid channel 21 and the mounting hole 22 will be small, resulting in a smaller allowable error during processing and increased manufacturing difficulty. If the ratio of the minimum distance from the mounting hole 22 along the second direction to the fluid channel 21 to the dimension of the first edge 121 in the second direction is too large (greater than 0.6), the distance between the fluid channel 21 and the mounting hole 22 will be large. In this case, the arrangement space reserved for the fluid channel 21 by the two mounting holes 22 in the second direction will not be fully utilized, resulting in low space utilization.

[0060] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the mounting hole 22 to the fluid channel 21 along the second direction to the size of the first edge 121 in the second direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the fluid channel 21 by the two mounting holes 22 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchanger 20.

[0061] As one possible implementation, the minimum distance from the mounting hole 22 to the fluid channel 21 along the second direction is D3, in mm, where 5 mm ≤ D3 ≤ 12 mm. For example, D3 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, or 12 mm.

[0062] If the minimum distance from the mounting hole 22 to the fluid channel 21 along the second direction is too small, i.e. less than 5 mm, the distance between the fluid channel 21 and the mounting hole 22 will be small, which will result in a smaller allowable error during processing and increased manufacturing difficulty. If the minimum distance from the mounting hole 22 to the fluid channel 21 along the second direction is too large, i.e. greater than 12 mm, the arrangement space reserved for the fluid channel 21 by the two mounting holes 22 in the second direction will not be fully utilized, resulting in low space utilization.

[0063] According to the battery pack 100 provided by this utility model, the minimum distance from the mounting hole 22 to the fluid channel 21 along the second direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved by the two mounting holes 22 for the fluid channel 21 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchanger 20.

[0064] As one possible implementation, the dimension of the first edge 121 in the second direction is W, in mm, where 20mm ≤ W ≤ 60mm. For example, W can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 58mm, or 60mm.

[0065] If the dimension of the first edge 121 in the second direction is too small, i.e. less than 20 mm, the portion of the fluid channel 21 located between the two mounting holes 22 of the pair of batteries 10 will also have a smaller dimension in the second 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 exchanger 20. If the dimension of the first edge 121 in the second direction is too large, i.e. greater than 60 mm, it will be detrimental to the heat dissipation of the battery 10. Specifically, the central region of the battery 10 in the second direction will be farther from the heat dissipation surface, and heat will easily accumulate, thereby increasing the risk of local overheating of the battery pack 100.

[0066] According to the battery pack 100 provided by this utility model, the size of the first edge 121 in the second direction is limited to the above-mentioned numerical range, which can ensure that the two mounting holes 22 have space for the arrangement of fluid channels 21 in the second direction, and will not increase the risk of local overheating of the battery pack 100.

[0067] refer to Figure 5 The fluid channel 21 includes a wide section 23 and a narrow section 24. The narrow section 24 is located between two mounting holes 22. The projection of the wide section 23 along the first direction overlaps with the projection of the two mounting holes 22 along the first direction. Since the projection of the wide section 23 along the first direction overlaps with the projection of the two mounting holes 22 along the first direction, and the narrow section 24 is located between the two mounting holes 22, the size of the wide section 23 in the second direction is larger than the size of the narrow section 24. That is to say, the wide section 23 can occupy more space in the second direction, thereby increasing the contact area between the heat exchanger 20 and the bottom surface 12 of the battery 10, thereby improving the heat exchange efficiency and ensuring the overall heat exchange effect of the heat exchanger 20.

[0068] It should be noted that, in the current embodiment, the narrow segment 24 is located between the two mounting holes 22 and has a unique dimension in the second direction, while the wide segment 23 includes a straight segment and an arcuate transition segment connected to the narrow segment 24. Of course, in other embodiments, the narrow segment 24 may be configured such that at least a portion of it is located between the two mounting holes 22, and the wide segment 23 is connected to the narrow segment 24 and has a unique dimension in the second direction.

[0069] refer to Figure 2 and Figure 6The battery pack 100 includes two rows of batteries 10 arranged along a first direction, and each row of batteries includes multiple pairs of batteries 10 arranged along a second direction. Each fluid channel 21 is configured to exchange heat with the two pairs of batteries 10 arranged along the first direction. A wide section 23 includes a first wide section 231, a second wide section 232, and a third wide section 233. A narrow section 24 includes a first narrow section 241 and a second narrow section 242. The first narrow section 241 connects to the first wide section 231 and the second wide section 232, and the second narrow section 242 connects to the second wide section 232 and the third wide section 233. According to the battery pack 100 provided by this utility model, the fluid channel 21 only needs to be connected to one inlet and one outlet to form a complete heat exchange flow path for heat exchange with the two pairs of batteries 10 arranged along the second direction. This implementation simplifies the structure of the heat exchange component 20 and improves space utilization.

[0070] refer to Figure 6 and Figure 7 The second wide section 232 includes a first plate portion 234 and a second plate portion 235 spaced apart in the vertical direction. The first plate portion 234 is closer to the bottom surface 12 than the second plate portion 235. The second plate portion 235 has a recess 25 that protrudes from the second plate portion 235 toward the first plate portion 234. When the dimensions of the wide section 23 and the narrow section 24 of the fluid channel 21 are different in the second direction, the flow area of ​​the heat exchange medium will change abruptly, resulting in uneven flow velocity distribution. To address this, the battery pack 100 provided by this invention has a recess 25 on the second wide section 232. The recess 25 can reduce the flow area of ​​the second wide section 232, reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, and thus enable the heat exchange medium to flow smoothly.

[0071] refer to Figure 6 and Figure 7 The projection of the recess 25 along the first direction overlaps with the projection of the first narrow section 241 along the first direction. When the heat exchange medium flows from the first narrow section 241 to the second wide section 232, the flow path of the heat exchange medium bypasses the two recesses 25. That is, the flow path of the heat exchange medium will at least partially bypass the spaced portions of the two batteries 10, thereby improving the heat exchange efficiency of the heat exchange medium.

[0072] refer to Figure 6 and Figure 7 The projection of the recess 25 along the first direction overlaps with the projection of the second narrow section 242 along the first direction. When the heat exchange medium flows from the second wide section 232 to the second narrow section 242, the recess 25 can reduce the flow area of ​​the second wide section 232, reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, reduce the probability of turbulence, and thus enable the heat exchange medium to flow smoothly.

[0073] refer to Figure 6In the second direction, the dimension of the first narrow segment 24 is L1 in mm, and the minimum distance from the recess 25 to the second wide segment 232 is L3 in mm, where 0.25 ≤ L1 / L3 ≤ 3. For example, L1 / L3 can be 0.25, 0.3, 0.5, 0.7, 0.9, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, or 3.

[0074] If the ratio of the dimension of the first narrow segment 241 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too small, i.e., less than 0.25, then the dimension of the first narrow segment 241 in the second direction is small. This makes it easy for vortices to form in the transition area from the first narrow segment 241 to the second wide segment 232, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. If the ratio of the dimension of the first narrow segment 241 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too large, i.e., greater than 3, then the distance from the recess 25 to the second wide segment 232 is small, meaning the dimension of the second wide segment 232 in the second direction is small. This results in a smaller heat exchange area between the second wide segment 232 and the bottom surface 12 of the battery 10, leading to poor heat exchange performance of the heat exchanger 20.

[0075] According to the battery pack 100 provided by this utility model, the ratio of the size of the first narrow section 241 in the second direction to the minimum distance from the recess 25 to the second wide section 232 is limited to the above-mentioned numerical range. This can make the flow velocity distribution of the heat exchange medium in the transition area from the first narrow section 241 to the second wide section 232 more uniform, and can also ensure the heat exchange area between the second wide section 232 and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0076] refer to Figure 6 In the second direction, the dimension of the first narrow segment 24 is L1 in mm, and the minimum distance from the recess 25 to the second wide segment 232 is L3 in mm, where 0.5 ≤ L1 / L3 ≤ 1.5. For example, L1 / L3 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5.

[0077] If the ratio of the dimension of the first narrow segment 241 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too small, i.e., less than 0.5, then the dimension of the first narrow segment 241 in the second direction is small. This makes it easy for vortices to form in the transition area from the first narrow segment 241 to the second wide segment 232, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. If the ratio of the dimension of the first narrow segment 241 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too large, i.e., greater than 1.5, then the distance from the recess 25 to the second wide segment 232 is small, meaning the dimension of the second wide segment 232 in the second direction is small. This results in a smaller heat exchange area between the second wide segment 232 and the bottom surface 12 of the battery 10, leading to poor heat exchange performance of the heat exchanger 20.

[0078] According to the battery pack 100 provided by this utility model, the ratio of the size of the first narrow section 241 in the second direction to the minimum distance from the recess 25 to the second wide section 232 is limited to the above-mentioned numerical range. This can make the flow velocity distribution of the heat exchange medium in the transition area from the first narrow section 241 to the second wide section 232 more uniform, and can also ensure the heat exchange area between the second wide section 232 and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0079] Continue to refer to Figure 6 In the second direction, the dimension of the second narrow segment 24 is L2 in mm, and the minimum distance from the recess 25 to the second wide segment 232 is L3 in mm, where 0.25 ≤ L2 / L3 ≤ 3. For example, L2 / L3 can be 0.25, 0.3, 0.35, 0.4, 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 2, 2.2, 2.5, or 3.

[0080] If the ratio of the dimension of the second narrow segment 242 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too small, i.e., less than 0.25, then the dimension of the second narrow segment 242 in the second direction is small. This will cause vortices to appear in the constricted part of the flow channel of the heat exchange medium, resulting in local flow instability and thus reducing the overall heat exchange efficiency of the heat exchanger 20. If the ratio of the dimension of the second narrow segment 242 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is too large, i.e., greater than 3, then the distance from the recess 25 to the second wide segment 232 is small, which means the dimension of the second wide segment 232 in the second direction is small. In this case, the heat exchange area between the second wide segment 232 and the bottom surface 12 of the battery 10 is also small, and the heat exchange effect of the heat exchanger 20 is poor.

[0081] According to the battery pack 100 provided by this utility model, the ratio of the size of the second narrow segment 242 in the second direction to the minimum distance from the recess 25 to the second wide segment 232 is limited to the above-mentioned numerical range. This can reduce the probability of vortex formation of the heat exchange medium in the flow channel contraction part, and also ensure the heat exchange area between the second wide segment 232 and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0082] Continue to refer to Figure 6 The recess 25 includes two first recesses 251 and two second recesses 252, spaced apart in a first direction and in a second direction. When the heat exchange medium flows from the first narrow section 241 to the second wide section 232, the flow resistance between the two first recesses 251 and the two second recesses 252 is relatively large. Therefore, the flow path of the heat exchange medium will bypass the two first recesses 251 and the two second recesses 252, thereby reducing the flow area of ​​the fluid channel 21 and reducing the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thus enabling the heat exchange medium to flow smoothly. In addition, compared with a single complete recess 25, the design of four recesses 25 helps to enhance the structural stability of the entire plate, avoid stress concentration or deformation problems that may be caused by large-area depressions, and improve the impact resistance and bending resistance of the heat exchange component 20.

[0083] refer to Figure 8 The two battery pairs include a first pair (located at the top of the figure) and a second pair (located at the bottom of the figure). The projection of the first recess 251 in the vertical direction overlaps with the vertical projection of one of the batteries 10 in the first pair. In the second direction, the distance between the two first recesses 251 is equal to the distance between the two batteries 10 in the first pair. The projection of the second recess 252 in the vertical direction overlaps with the vertical projection of one of the batteries 10 in the second pair. In the second direction, the distance between the two second recesses 252 is equal to the distance between the two batteries 10 in the second pair. When the heat exchange medium flows from the first narrow section 241 to the second wide section 232, the flow path of the heat exchange medium bypasses the two first recesses 251 and the two second recesses 252. That is, the flow path of the heat exchange medium bypasses the distance between the two batteries 10, thereby improving the heat exchange efficiency of the heat exchange medium.

[0084] refer to Figure 8 The orthographic projection area of ​​the recess 25 along the vertical direction is A1, in mm. 2 The orthographic projection area of ​​the second wide segment 23 along the vertical direction is A2, in mm. 2 0.1≤A1 / A2≤0.6. For example, A1 / A2 can be 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6.

[0085] If the ratio of the vertical projection area of ​​the recess 25 to the vertical projection area of ​​the second wide section 232 is too small (less than 0.1), the flow area of ​​the heat exchange medium increases sharply when it flows from the first narrow section 241 to the second wide section 232, resulting in uneven flow velocity distribution. If the ratio of the vertical projection area of ​​the recess 25 to the vertical projection area of ​​the second wide section 232 is too large (greater than 0.6), the heat exchange area between the heat exchange medium and the bottom surface 12 of the battery 10 is small, resulting in poor heat exchange performance.

[0086] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the recess 25 along the vertical direction to the projected area of ​​the second wide section 23 along the vertical direction is limited to the above-mentioned numerical range. This can reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, so that the heat exchange medium can flow smoothly, and also ensure the contact area between the heat exchange medium and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20.

[0087] As one possible implementation, the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 is A3, in mm. 2 The area of ​​the bottom surface 12 of the two pairs of batteries 10 is A4, in mm. 2 0.3 ≤ A3 / A4 ≤ 0.9. For example, A3 / A4 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9.

[0088] If the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is too small, i.e. less than 0.3, the heat exchange area between the heat exchange medium and the bottom surface 12 of the batteries 10 is small, resulting in poor heat exchange effect. If the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is too large, i.e. greater than 0.9, the area of ​​the mounting hole 22 is small, resulting in limited installation space for the explosion-proof valve 13.

[0089] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is limited to the above-mentioned numerical range. This can ensure the contact area between the heat exchange medium and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the explosion-proof valve 13.

[0090] As one possible implementation, the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 is A3, in mm. 2 The area of ​​the bottom surface 12 of the two pairs of batteries 10 is A4, in mm. 20.5 ≤ A3 / A4 ≤ 0.7. For example, A3 / A4 can be 0.5, 0.55, 0.6, 0.65 or 0.7.

[0091] If the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is too small, i.e., less than 0.5, the heat exchange area between the heat exchange medium and the bottom surface 12 of the batteries 10 is small, resulting in poor heat exchange effect. If the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is too large, i.e., greater than 0.7, the area of ​​the mounting hole 22 is small, resulting in limited installation space for the explosion-proof valve 13.

[0092] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the fluid channel 21 on the bottom surface 12 of the two pairs of batteries 10 to the area of ​​the bottom surface 12 of the two pairs of batteries 10 is limited to the above-mentioned numerical range. This can ensure the contact area between the heat exchange medium and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the explosion-proof valve 13.

[0093] refer to Figure 5 Each pair of batteries 10 located on both sides in the second direction includes a first battery 101 and a second battery 102. The second battery 102 is closer to the other pairs of batteries 10 than the first battery 101. In the second direction, the distance from the mounting hole 22 corresponding to the first battery 101 to the second edge 122 of the first battery 101 away from the second battery 102 is D11 (in mm), and the distance from the mounting hole 22 corresponding to the second battery 102 to the second edge 122 of the second battery 102 away from the first battery 101 is D12 (in mm). <D12。

[0094] Because the second battery 102 is closer to the other batteries 10 in the multiple battery pairs 10 than the first battery 101, the second battery 102 is more significantly affected by heat accumulation. The battery pack 100 provided by this utility model can increase the distance between the mounting hole 22 corresponding to the second battery 102 and the mounting hole 22 of the adjacent battery 10, thereby increasing the spacing of the explosion-proof valves 13 of the two batteries 10 that are close to each other in the second direction. In this way, the impact of the explosion-proof valve 13 on the other explosion-proof valve 13 when one of the explosion-proof valves 13 bursts can be effectively reduced, thereby improving the safety of the battery pack 100.

[0095] As one possible implementation, in the second direction, the distance from the mounting hole 22 corresponding to the first battery 101 to the second edge 122 of the first battery 101 away from the second battery 102 is D11, in mm, and the dimension of the first edge 121 is W, in mm, where 0.03 ≤ D11 / W ≤ 0.3. For example, D11 / W can be 0.03, 0.05, 0.1, 0.15, 0.2, 0.25, or 0.3.

[0096] If the ratio of the distance from the mounting hole 22 corresponding to the first battery 101 along the second direction to the second edge 122 of the first battery 101 away from the second battery 102 to the dimension of the first edge 121 in the second direction is small, i.e. less than 0.03, then the distance from the mounting hole 22 to the second edge 122 near the outer side is too small. Therefore, the distance from the explosion-proof valve 13 to the edge of the housing 11 is small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the ratio of the distance from the mounting hole 22 corresponding to the first battery 101 along the second direction to the second edge 122 of the first battery 101 away from the second battery 102 to the dimension of the first edge 121 in the second direction is large, i.e. greater than 0.3, then the arrangement space of the fluid channel 21 in the second direction is small. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and is not conducive to the heat exchange effect of the heat exchange element 20.

[0097] The battery pack 100 provided by this utility model limits the ratio of the distance from the mounting hole 22 corresponding to the first battery 101 to the second edge 122 of the first battery 101 away from the second battery 102 along the second direction to the size of the first edge 121 in the second direction to the above-mentioned numerical range. This can ensure the arrangement space of the fluid channel 21 in the second direction and reduce the mechanical strength of the edge area of ​​the housing 11.

[0098] As one possible implementation, in the second direction, the distance from the mounting hole 22 corresponding to the second battery 102 to the second edge 122 of the second battery 102 away from the first battery 101 is D12, in mm, and the dimension of the first edge 121 is W, in mm, where 0.035 ≤ D12 / W ≤ 0.35. For example, D12 / W can be 0.035, 0.05, 0.08, 0.11, 0.14, 0.18, 0.21, 0.25, 0.29, or 0.35.

[0099] If the ratio of the distance from the mounting hole 22 corresponding to the second battery 102 to the second edge 122 of the second battery 102 away from the first battery 101 to the dimension of the first edge 121 in the second direction is small, i.e., less than 0.035, then the spacing of the explosion-proof valves 13 of the two batteries 10 that are close to each other in the two pairs of batteries 10 in the second direction is small. In this case, for the two batteries 10 that are close to each other in the two pairs of batteries 10, 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 distance from the mounting hole 22 corresponding to the second battery 102 to the second edge 122 of the second battery 102 away from the first battery 101 to the dimension of the first edge 121 in the second direction is large, i.e., greater than 0.35, then the arrangement space of the fluid channel 21 in the second direction is small. 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.

[0100] The battery pack 100 provided by this utility model limits the ratio of the distance from the mounting hole 22 corresponding to the second battery 102 to the second edge 122 of the second battery 102 away from the first battery 101 to the dimension of the first edge 121 in the second direction to the above-mentioned numerical range. This can ensure the arrangement space of the fluid channel 21 in the second direction and effectively reduce the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when one of the explosion-proof valves 13 bursts, thereby improving the safety of the battery pack 100.

[0101] As one possible implementation, refer to Figure 9 In two adjacent battery pairs 10, the explosion-proof valves 13 of the two batteries 10 that are close to each other do not overlap at least partially in the second direction. This can increase the distance between the two explosion-proof valves 13, thereby effectively reducing the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when it bursts, and improving the safety of the battery pack 100.

[0102] <Example Electrical Equipment> refer to Figure 10 This utility model provides an electrical device 200, which includes a battery pack 100.

[0103] 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.

[0104] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0105] In a non-restrictive example, refer to Figure 10The 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.

[0106] 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".

[0107] 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 edge and the second edge), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0108] 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: Multiple batteries (10), each battery including a housing (11), the bottom surface (12) of the housing (11) being provided with an explosion-proof valve (13), the bottom surface (12) including two first edges (121) and two second edges (122), the two first edges (121) being spaced apart in a first direction, the two second edges (122) being spaced apart in a second direction, the size of the first edge (121) being smaller than the size of the second edge (122), and the first direction, the second direction and the up and down direction being perpendicular to each other; as well as The heat exchanger (20) includes a plurality of fluid channels (21) and a plurality of mounting holes (22), the plurality of fluid channels (21) extending along a first direction, and the plurality of mounting holes (22) spaced along a second direction and (22) receiving explosion-proof valves (13) from the plurality of batteries (10), wherein, The battery pack (100) includes multiple pairs of batteries (10) arranged along the second direction. At least a portion of the fluid channel (21) is located between two mounting holes (22) corresponding to a pair of batteries (10). In the second direction, the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) closer to the other battery (10) is D1 in mm, and the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) away from the other battery (10) is D2 in mm, where D1 > D2.

2. The battery pack (100) according to claim 1, characterized in that, In the second direction, the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) that is closer to the other battery (10) is D1, in mm, and the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) that is farther away from the other battery (10) is D2, in mm, and 1 < D1 / D2 ≤ 7.

5.

3. The battery pack (100) according to claim 2, characterized in that, In the second direction, the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) near the other battery (10) is D1, in mm, where 6 mm ≤ D1 ≤ 15 mm.

4. The battery pack (100) according to claim 2, characterized in that, In the second direction, the distance from the mounting hole (22) to the second edge (122) of the corresponding battery (10) away from the other battery (10) is D2, in mm, where 2mm≤D2≤6mm.

5. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the mounting hole (22) to the fluid channel (21) is D3 in mm, and the size of the first edge (121) is W in mm, 0.083≤D3 / W≤0.

6.

6. The battery pack (100) according to claim 5, characterized in that, In the second direction, the minimum distance from the mounting hole (22) to the fluid channel (21) is D3, in mm, where 5 mm ≤ D3 ≤ 12 mm.

7. The battery pack (100) according to claim 5, characterized in that, In the second direction, the dimension of the first edge (121) is W, in mm, where 20 mm ≤ W ≤ 60 mm.

8. The battery pack (100) according to claim 1, characterized in that, The fluid channel (21) includes a wide section (23) and a narrow section (24), the narrow section (24) being located between the two mounting holes (22), and the projection of the wide section (23) along the first direction partially overlapping the projection of the two mounting holes (22) along the first direction.

9. The battery pack (100) according to claim 8, characterized in that, The device includes two rows of batteries (10) arranged along the first direction, each row of batteries (10) including multiple pairs of batteries (10) arranged along the second direction, the fluid channel (21) being configured to exchange heat with the two pairs of batteries (10) arranged along the first direction, the wide section (23) including a first wide section (231), a second wide section (232) and a third wide section (233), the narrow section (24) including a first narrow section (241) and a second narrow section (242), the first narrow section (241) connecting the first wide section (231) and the second wide section (232), and the second narrow section (242) connecting the second wide section (232) and the third wide section (233).

10. The battery pack (100) according to claim 9, characterized in that, The second wide segment (232) includes a first plate portion (234) and a second plate portion (235) spaced apart along the vertical direction. The first plate portion (234) is closer to the bottom surface (12) than the second plate portion (235). The second plate portion (235) is provided with a recess (25) that protrudes from the second plate portion (235) toward the first plate portion (234). The projection of the recess (25) along the first direction overlaps with the projection of the first narrow segment (241) along the first direction.

11. The battery pack (100) according to claim 10, characterized in that, The projection of the recess (25) along the first direction overlaps with the projection of the second narrow segment (242) along the first direction.

12. The battery pack (100) according to claim 10, characterized in that, In the second direction, the size of the first narrow segment (241) is L1 in mm, and the minimum distance from the recess (25) to the second wide segment (232) is L3 in mm, where 0.25 ≤ L1 / L3 ≤ 3.

13. The battery pack (100) according to claim 10, characterized in that, In the second direction, the size of the first narrow segment (241) is L1 in mm, and the minimum distance from the recess (25) to the second wide segment (232) is L3 in mm, 0.5≤L1 / L3≤1.

5.

14. The battery pack (100) according to claim 10, characterized in that, In the second direction, the size of the second narrow segment (242) is L2 in mm, and the minimum distance from the recess (25) to the second wide segment (232) is L3 in mm, 0.25≤L2 / L3≤3.

15. The battery pack (100) according to claim 10, characterized in that, The recess (25) includes two first recesses (251) and two second recesses (252), the two first recesses (251) and the two second recesses (252) being spaced apart in the first direction, the two first recesses (251) being spaced apart in the second direction, and the two second recesses (252) being spaced apart in the second direction.

16. The battery pack (100) according to claim 15, characterized in that, The two pairs of batteries (10) include a first pair of batteries and a second pair of batteries. The projection of the first recess (251) in the vertical direction overlaps with the projection of one of the batteries (10) in the first pair of batteries in the vertical direction. In the second direction, the distance between the two first recesses (251) is equal to the distance between the two batteries (10) in the first pair of batteries. The projection of the second recess (252) in the vertical direction overlaps with the projection of one of the batteries (10) in the second pair of batteries in the vertical direction. In the second direction, the distance between the two second recesses (252) is equal to the distance between the two batteries (10) in the second pair of batteries.

17. The battery pack (100) according to claim 10, characterized in that, The orthographic projection area of ​​the recess (25) along the vertical direction is A1, in mm. 2 The projected area of ​​the second wide segment (232) along the vertical direction is A2, in mm. 2 , 0.1≤A1 / A2≤0.

6.

18. The battery pack (100) according to claim 9, characterized in that, The projected area of ​​the fluid channel (21) on the bottom surface (12) of the two pairs of batteries is A3, in mm. 2 The area of ​​the bottom surface (12) of the two pairs of batteries is A4, in mm. 2 , 0.3≤A3 / A4≤0.

9.

19. The battery pack (100) according to claim 9, characterized in that, The projected area of ​​the fluid channel (21) on the bottom surface (12) of the two pairs of batteries is A3, in mm. 2 The area of ​​the bottom surface (12) of the two pairs of batteries is A4, in mm. 2 , 0.5≤A3 / A4≤0.

7.

20. The battery pack (100) according to claim 1, characterized in that, Each pair of batteries located on both sides of the plurality of battery pairs in the second direction includes a first battery (101) and a second battery (102). The second battery (102) is closer to the other plurality of battery pairs than the first battery (101). In the second direction, the distance from the mounting hole (22) corresponding to the first battery (101) to the second edge (122) of the first battery (101) away from the second battery (102) is D11, in mm. The distance from the mounting hole (22) corresponding to the second battery (102) to the second edge (122) of the second battery (102) away from the first battery (101) is D12, in mm. <D12。 21. The battery pack (100) according to claim 20, characterized in that, In the second direction, the distance from the mounting hole (22) corresponding to the first battery (101) to the second edge (122) of the first battery (101) away from the second battery (102) is D11, in mm, and the size of the first edge (121) is W, in mm, 0.03≤D11 / W≤0.

3.

22. The battery pack (100) according to claim 20, characterized in that, In the second direction, the distance from the mounting hole (22) corresponding to the second battery (102) to the second edge (122) of the second battery (102) away from the first battery (101) is D12, in mm, and the size of the first edge (121) is W, in mm, 0.035≤D12 / W≤0.

35.

23. The battery pack (100) according to claim 1, characterized in that, The explosion-proof valves (13) of the two batteries that are close to each other in two adjacent pairs of batteries (10) do not overlap at least partially in the second direction.

24. An electrical appliance (200), characterized in that, Includes the battery pack (100) as described in claims 1 to 23.

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