Battery pack and electric device with same

Abstract

The present disclosure relates to a battery pack and an electric device having the same, the battery pack comprising a plurality of batteries and a heat exchange unit, each battery comprising a housing, a bottom surface of the housing being provided with an explosion-proof valve, the bottom surface having a dimension in a first direction greater than a dimension in a second direction. The heat exchange unit comprises a plurality of flow channels extending in the first direction and a plurality of relief holes spaced in the second direction and receiving the explosion-proof valves of the plurality of batteries. The battery pack comprises a plurality of pairs of batteries arranged in the second direction, each pair of batteries corresponding to two relief holes, each relief hole comprising a hole body and an extension extending towards the other relief hole, the two extensions being spaced in the first direction, a portion of the flow channel between the two relief holes having a dimension D1 in the second direction in mm, and a minimum distance D2 between the two extensions in the second direction in mm, D1>D2, the portion of the flow channel being capable of being disposed between the extension of one relief hole and the hole body of the other relief hole.

Description

Technical Field

[0001] This disclosure 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 critical components in applications such as electric vehicles and energy storage systems, and their safety and reliability directly affect the operational stability of the entire vehicle or system. During actual use, batteries generate a significant amount of heat during charging and discharging. If this heat cannot be dissipated effectively and promptly, or if heat dissipation is uneven, localized temperature increases can occur, potentially leading to thermal runaway and threatening the safety of the battery pack and the entire vehicle. Therefore, to ensure the safe operation of the battery pack, heat exchange units are typically installed within the pack, maintaining close contact with the batteries to reduce cell temperature through heat exchange and prevent safety risks caused by localized overheating.

[0003] Meanwhile, battery casings are typically equipped with explosion-proof valves to quickly release gas when internal pressure is too high, ensuring the safety of the battery pack. However, the installation of explosion-proof valves can restrict the arrangement of heat exchange units, reducing the cross-sectional area of ​​the flow channels and consequently affecting the flow efficiency of the cooling medium within the channels, thus reducing the overall heat exchange effect. Utility Model Content

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

[0005] The battery pack disclosed herein includes multiple batteries and a heat exchange unit. Each battery includes a housing with an explosion-proof valve on its bottom surface. The bottom surface has a larger dimension in a first direction than in a second direction, and the first, second, and vertical directions are mutually perpendicular. The heat exchange unit includes multiple flow channels and multiple clearance holes. The flow channels extend along the first direction, and the clearance holes are spaced apart along the second direction. Each clearance hole receives the explosion-proof valve of one of the multiple batteries. The battery pack includes multiple pairs of batteries arranged along the second direction. Each pair of batteries corresponds to two clearance holes. Each clearance hole includes a hole body and an extension extending toward another clearance hole. The two extensions are spaced apart in the first direction. The dimension of the flow channel portion between the two clearance holes in the second direction is D1 (in mm), and the minimum distance between the two extensions in the second direction is D2 (in mm), where D1 > D2.

[0006] The beneficial effects of the battery pack provided by this utility model are as follows: Since the two extensions are spaced apart in the first direction, a portion of the flow channel can be located between the extension of one clearance hole and the body of the other clearance hole. Compared to arranging it between the two extensions, arranging a portion of the flow channel between the extension of one clearance hole and the body of the other clearance hole allows for a larger dimension in the second direction. This approach helps reduce flow resistance, improves the flow efficiency of the heat exchange medium, and thus ensures the heat exchange effect of the heat exchange unit.

[0007] On the other hand, this disclosure 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 disclosure, the accompanying drawings used in the embodiments will be briefly described below.

[0009] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting 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 3A schematic diagram of a part of the structure.

[0020] Figure 9 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0021] Reference numerals: Battery pack-100; Battery-10; Housing-11; Bottom surface-12; First edge-121; Second edge-122; Explosion-proof valve-13; Heat exchange unit-20; Flow channel-21; Clearance hole-22; Hole body-221; Extension-222; Wide section-23; First wide section-231; Second wide section-232; Third wide section-233; First plate-234; Second plate-235; Recess-25; Narrow section-24; First narrow section-241; Second narrow section-242; Electrical equipment-200. Detailed Implementation

[0022] The embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that there are many ways to implement this disclosure, and it should not be construed as being limited to the embodiments set forth herein. The embodiments set forth herein are only for a more thorough and clear understanding of this disclosure.

[0023] <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.

[0024] The battery 10 includes a housing 11 and battery cells (not shown) disposed within the housing 11.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 has a larger dimension in the first direction than in the second direction.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] <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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 exchange unit 20, which is used to dissipate heat from the battery 10 to regulate the temperature of the battery 10.

[0040] As one possible implementation, the heat exchange unit 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.

[0041] 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.

[0042] As an example, the heat exchange unit 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.

[0043] As another example, the heat exchange unit 20 can be a liquid-cooled plate 20, which has liquid-cooled flow 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.

[0044] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped. To clearly illustrate the positional relationships of the structures, Figure 3 A portion of the construction in the bottom view has been omitted. (Reference) Figure 3 The heat exchange unit 20 includes multiple flow channels 21 and multiple clearance holes 22. The multiple flow channels 21 extend along a first direction, and the multiple clearance holes 22 are spaced along a second direction and receive multiple explosion-proof valves 13 of batteries 10.

[0045] refer to Figure 2 , Figure 5 and Figure 6 The battery pack 100 includes multiple pairs of batteries arranged along a second direction. Each pair of batteries corresponds to two clearance holes 22. Each clearance hole 22 includes a hole body 221 and an extension 222 extending toward another clearance hole 22. The two extensions 222 are spaced apart in a first direction. The flow channel 21 portion located between the two clearance holes 22 has a dimension D1 in the second direction, in mm. The minimum distance between the two extensions 222 in the second direction is D2, in mm, where D1 > D2.

[0046] Since the two extensions 222 are spaced apart in the first direction, a portion of the flow channel 21 can be located between the extension 222 of one clearance hole 22 and the body 221 of the other clearance hole 22. Compared to arranging it between the two extensions 222, arranging a portion of the flow channel 22 between the extension 222 of one clearance hole 22 and the body 221 of the other clearance hole 22 allows for a larger size in the second direction. This implementation helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the heat exchange effect of the heat exchange unit 20.

[0047] As one possible implementation, refer to Figure 6 The portion of the flow channel 21 located between the two clearance holes 22 has a dimension D1 in the second direction, in mm, where 10 mm ≤ D1 ≤ 30 mm. For example, D1 can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 21 mm, 25 mm, or 30 mm.

[0048] If the dimension of the flow channel 21 located between the two clearance holes 22 in the second direction is too small, i.e., less than 10 mm, the arrangement space reserved for the flow channel 21 in the second direction by the two clearance holes 22 will not be fully utilized, resulting in low space utilization. If the dimension of the flow channel 21 located between the two clearance holes 22 in the second direction is too large, i.e., greater than 30 mm, the distance between the flow channel 21 and the clearance holes 22 will be small, which will result in a smaller allowable error during processing and increased manufacturing difficulty.

[0049] According to the battery pack 100 provided by this utility model, the size of the flow channel 21 located between the two clearance holes 22 in the second direction is limited to the above-mentioned numerical range, which can ensure the arrangement space of the flow channel 21 in the second direction without excessively increasing the manufacturing difficulty of the heat exchange unit 20.

[0050] As one possible implementation, refer to Figure 6 The minimum distance between the two extensions 222 in the second direction is D2, in mm, where 8 mm ≤ D2 ≤ 25 mm. For example, D2 can be 8 mm, 10 mm, 12 mm, 13 mm, 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, or 25 mm.

[0051] If the minimum distance between the two extensions 222 in the second direction is too small, i.e., less than 8 mm, it will restrict the size of the flow channel 21 in the second direction. If the minimum distance between the two extensions 222 in the second direction is too large, i.e., greater than 25 mm, the area of ​​the clearance hole 22 will be small, which will restrict the installation space of the explosion-proof valve 13. According to the battery pack 100 provided by this utility model, limiting the minimum distance between the two extensions 222 in the second direction to the above-mentioned numerical range can both ensure the arrangement space of the flow channel 21 in the second direction and reserve sufficient installation space for the explosion-proof valve 13.

[0052] As one possible implementation, refer to Figure 6 The flow channel 21 located between the two clearance holes 22 has a dimension D1 in the second direction, in mm. The minimum distance from the main body 221 of the clearance hole 22 to the extension 222 of the other clearance hole 22 along the second direction is D3, in mm, where 0.25 ≤ D1 / D3 ≤ 0.75. For example, D1 / D3 can be 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.60, or 0.75.

[0053] If the ratio of the dimension of the flow channel 21 between the two clearance holes 22 in the second direction to the minimum distance from the hole body 221 of the clearance hole 22 to the extension 222 of the other clearance hole 22 in the second direction is too small, i.e. less than 0.25, then the arrangement space reserved for the flow channel 21 in the second direction by the two clearance holes 22 is not fully utilized, resulting in low space utilization. If the ratio of the dimension of the flow channel 21 between the two clearance holes 22 in the second direction to the minimum distance from the hole body 221 of the clearance hole 22 to the extension 222 of the other clearance hole 22 in the second direction is too large, i.e. greater than 0.75, then the distance between the flow channel 21 and the clearance hole 22 is small, which will result in a smaller allowable error during processing and increased manufacturing difficulty.

[0054] According to the battery pack 100 provided by this utility model, the ratio of the dimension of the flow channel 21 located between the two clearance holes 22 in the second direction to the minimum distance from the hole body 221 of the clearance hole 22 to the extension 222 of the other clearance hole 22 in the second direction is limited to the above-mentioned numerical range. This ensures the arrangement space of the flow channel 21 in the second direction without excessively increasing the manufacturing difficulty of the heat exchange unit 20.

[0055] As one possible implementation, refer to Figure 6 The minimum distance from the main body 221 of the clearance hole 22 to the extension 222 of another clearance hole 22 along the second direction is D3, in mm, where 25mm≤D3≤40mm. For example, D3 can be 25mm, 27mm, 29mm, 31mm, 33mm, 35mm, 37mm or 40mm.

[0056] If the minimum distance from the main body 221 of the clearance hole 22 along the second direction to the extension 222 of the other clearance hole 22 is too small, i.e., less than 25 mm, it will restrict the size of the flow channel 21 in the second direction. If the minimum distance from the main body 221 of the clearance hole 22 along the second direction to the extension 222 of the other clearance hole 22 is too large, i.e., greater than 40 mm, the area of ​​the clearance hole 22 will be small, which will restrict the installation space of the explosion-proof valve 13. According to the battery pack 100 provided by this utility model, limiting the minimum distance from the main body 221 of the clearance hole 22 along the second direction to the extension 222 of the other clearance hole 22 within the above-mentioned numerical range can both ensure the size of the flow channel 21 in the second direction and reserve sufficient installation space for the explosion-proof valve 13.

[0057] As one possible implementation, refer to Figure 6In the first direction, the dimension of the extension 222 is L1 in mm, and the dimension of the hole body 221 is W1 in mm, where 0.1 ≤ L1 / W1 < 0.5. For example, L1 / W1 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.49.

[0058] If the ratio of the dimension of the extension 222 in the first direction to the dimension of the orifice body 221 in the first direction is too small, i.e., less than 0.1, the area of ​​the clearance hole 22 will be small, which will limit the installation space of the explosion-proof valve 13. If the ratio of the dimension of the extension 222 in the first direction to the dimension of the orifice body 221 in the first direction is too large, i.e. greater than or equal to 0.5, the dimension between the two extensions 222 in the first direction will be small. As a result, when the heat exchange medium passes between the two clearance holes 22, the width of the flow channel will change suddenly, which is not conducive to the smooth flow of the heat exchange medium.

[0059] According to the battery pack 100 provided by this utility model, the ratio of the dimension of the extension 222 in the first direction to the dimension of the hole body 221 in the first direction is limited to the above-mentioned numerical range. This can reduce the degree of change in the flow direction of the heat exchange medium, ensure that the heat exchange medium can flow smoothly, and ensure the installation space of the explosion-proof valve 13.

[0060] As one possible implementation, refer to Figure 6 The extension 222 has a dimension L1 in the first direction, in mm, where 10mm ≤ L1 ≤ 50mm. For example, L1 can be 10mm, 15mm, 18mm, 22mm, 27mm, 33mm, 40mm, or 50mm.

[0061] If the dimension of the extension 222 in the first direction is too small, i.e. less than 10 mm, the area of ​​the clearance hole 22 will be small, which will limit the installation space of the explosion-proof valve 13. If the dimension of the extension 222 in the first direction is too large, i.e. greater than 50 mm, the dimension between the two extensions 222 in the first direction will be small. As a result, when the heat exchange medium passes between the two clearance holes 22, the width of the flow channel will change suddenly, which is not conducive to the smooth flow of the heat exchange medium.

[0062] According to the battery pack 100 provided by this utility model, the size of the extension 222 in the first direction is limited to the above-mentioned numerical range, which can reduce the degree of change in the flow direction of the heat exchange medium, ensure that the heat exchange medium can flow smoothly, and ensure the installation space of the explosion-proof valve 13.

[0063] As one possible implementation, refer to Figure 6The dimension of the hole body 221 in the first direction is W1, in mm, where 20mm≤W1≤100mm. For example, W1 can be 20mm, 25mm, 30mm, 38mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 85mm or 100mm.

[0064] If the size of the orifice body 221 in the first direction is too small, i.e. less than 20 mm, the area of ​​the clearance orifice 22 will be small, which will limit the installation space of the explosion-proof valve 13. If the size of the orifice body 221 in the first direction is too large, i.e. greater than 100 mm, the size of the flow channel 21 in the first direction will be small, which will result in a smaller contact area between the flow channel 21 and the battery 10, which is not conducive to the heat exchange effect of the heat exchange unit 20.

[0065] According to the battery pack 100 provided by this utility model, the size of the hole body 221 in the first direction is limited to the above-mentioned numerical range, which can ensure the contact area between the flow channel 21 and the battery 10, thereby ensuring the heat exchange effect of the heat exchange unit 20, and also ensure the installation space of the explosion-proof valve 13.

[0066] As one possible implementation, the extensions 222 of the battery pairs near the two sides in the second direction are larger in the first direction than the extensions 222 of the middle battery pair. Compared to the batteries 10 located on the two sides in the second direction, the battery 10 in the middle position is more significantly affected by heat accumulation. In the battery pack 100 provided by this utility model, the extensions 222 of the battery pairs near the two sides in the second direction are larger in the first direction than the extensions 222 of the middle battery pair. This increases the size of the flow channel 21 of the middle battery pair located between the two hole bodies 221, thereby increasing the contact area between the flow channel 21 and the bottom surface 12 of the battery 10. This helps to improve heat exchange efficiency, which in turn helps to ensure the uniformity of temperature distribution within the battery pack 100 and avoids local overheating.

[0067] refer to Figure 6 In the second direction, the dimension of the extension 222 is L2 in mm, and the dimension of the clearance hole 22 is W2 in mm, where 0.11 ≤ L2 / W2 ≤ 0.75. For example, L2 / W2 can be 0.11, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.50, 0.60, or 0.75.

[0068] If the ratio of the dimension of the extension 222 in the second direction to the dimension of the orifice body 221 in the second direction is too small, i.e. less than 0.11, the area of ​​the clearance hole 22 will be small, which will limit the installation space of the explosion-proof valve 13. If the ratio of the dimension of the extension 222 in the second direction to the dimension of the orifice body 221 in the second direction is too large, i.e. greater than 0.75, the angle between the portion of the flow channel 21 located between the two orifice bodies 221 and the portion located between the orifice body 221 and the extension 222 will be close to 90 degrees. As a result, the flow direction of the heat exchange medium will change drastically when passing between the two clearance holes 22, which is not conducive to the smooth flow of the heat exchange medium.

[0069] According to the battery pack 100 provided by this utility model, the ratio of the dimension of the extension 222 in the second direction to the dimension of the hole body 221 in the second direction is limited to the above-mentioned numerical range. This can reduce the degree of change in the flow direction of the heat exchange medium, ensure that the heat exchange medium can flow smoothly, and ensure the installation space of the explosion-proof valve 13.

[0070] As one possible implementation, refer to Figure 6 The extension 222 has a dimension of L2 in the second direction, in mm, where 5mm ≤ L2 ≤ 15mm. For example, L2 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, or 15mm.

[0071] If the extension 222 is too small in the second direction, i.e., less than 5 mm, the area of ​​the clearance hole 22 will be small, which will limit the installation space of the explosion-proof valve 13. If the extension 222 is too large in the second direction, i.e., greater than 15 mm, the angle between the portion of the flow channel 21 located between the two hole bodies 221 and the portion located between the hole bodies 221 and the extension 222 will be close to 90 degrees. As a result, the flow direction of the heat exchange medium will change drastically when passing between the two clearance holes 22, which is not conducive to the smooth flow of the heat exchange medium.

[0072] According to the battery pack 100 provided by this utility model, the size of the extension 222 in the second direction is limited to the above-mentioned numerical range, which can reduce the degree of change in the flow direction of the heat exchange medium, ensure that the heat exchange medium can flow smoothly, and ensure the installation space of the explosion-proof valve 13.

[0073] As one possible implementation, refer to Figure 6 The clearance hole 22 has a dimension of W2 in the second direction, in mm, where 20mm ≤ W2 ≤ 45mm. For example, W2 can be 20mm, 23mm, 26mm, 29mm, 32mm, 35mm, 40mm, or 45mm.

[0074] If the clearance hole 22 is too small in the second direction, i.e., less than 20 mm, the installation space for the explosion-proof valve 13 will be limited. If the clearance hole 22 is too large in the second direction, i.e., greater than 45 mm, the flow channel 21 will be too small in the second direction, resulting in a smaller contact area between the flow channel 21 and the battery 10, which is detrimental to the heat exchange effect of the heat exchange unit 20. According to the battery pack 100 provided by this utility model, limiting the size of the clearance hole 22 in the second direction to the above-mentioned numerical range can ensure both the contact area between the flow channel 21 and the battery 10, thereby ensuring the heat exchange effect of the heat exchange unit 20, and also ensure the installation space for the explosion-proof valve 13.

[0075] As one possible implementation, the extensions 222 of the battery pairs near the two sides in the second direction have a larger dimension in the second direction than the extensions 222 of the middle battery pair. Compared to the batteries 10 located on the two sides in the second direction, the battery 10 in the middle position is more significantly affected by heat accumulation. In the battery pack 100 provided by this utility model, the extensions 222 of the battery pairs near the two sides in the second direction have a larger dimension in the second direction than the extensions 222 of the middle battery pair. This can extend the length of the flow channel 21 of the battery pair located in the middle position, thereby increasing the contact area between the flow channel 21 and the bottom surface 12 of the battery 10. This helps to improve heat exchange efficiency, contributes to the uniformity of temperature distribution within the battery pack 100, and avoids local overheating.

[0076] Continue to refer to Figure 6 In the first direction, the minimum distance between the two extensions 222 is D4 in mm, and the size of the hole body 221 is W1 in mm, where 0.08 ≤ D4 / W1 ≤ 0.4. For example, D4 / W1 can be 0.08, 0.10, 0.12, 0.15, 0.18, 0.21, 0.25, 0.30, 0.35, or 0.4.

[0077] If the ratio of the minimum distance between the two extensions 222 in the first direction to the dimension of the orifice body 221 in the first direction is too small, i.e. less than 0.08, this will increase the angle formed by the extension direction of the portion of the flow channel 21 located in the two orifice bodies 221 and the first direction, causing the flow direction of the heat exchange medium to change drastically when passing between the two clearance holes 22, which is not conducive to the smooth flow of the heat exchange medium. If the ratio of the minimum distance between the two extensions 222 in the first direction to the dimension of the orifice body 221 in the first direction is too large, i.e. greater than 0.4, the area of ​​the clearance hole 22 will be small, thus limiting the installation space of the explosion-proof valve 13.

[0078] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance between the two extensions 222 in the first direction to the size of the hole body 221 in the first direction is limited to the above-mentioned numerical range, which can ensure that the heat exchange medium can flow smoothly when passing between the two clearance holes 22, and also ensure the installation space of the explosion-proof valve 13.

[0079] As one implementation method, refer to Figure 6 The minimum distance between the two extensions 222 in the first direction is D4, in mm, where 8 mm ≤ D4 ≤ 40 mm. For example, D4 ​​can be 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 21 mm, 25 mm, 28 mm, 32 mm, or 40 mm.

[0080] If the minimum distance between the two extensions 222 in the first direction is too small, i.e., less than 8 mm, this will increase the angle formed by the extension direction of the portion of the flow channel 21 located in the two hole bodies 221 and the first direction, causing the flow direction of the heat exchange medium to change drastically when passing between the two clearance holes 22, which is not conducive to the smooth flow of the heat exchange medium. If the minimum distance between the two extensions 222 in the first direction is too large, i.e., greater than 40 mm, the area of ​​the clearance hole 22 will be small, thus limiting the installation space of the explosion-proof valve 13.

[0081] According to the battery pack 100 provided by this utility model, the minimum distance between the two extensions 222 in the first direction is limited to the above-mentioned numerical range, which can ensure that the heat exchange medium can flow smoothly when passing between the two clearance holes 22, and also ensure the installation space of the explosion-proof valve 13.

[0082] refer to Figure 5 The flow channel 21 includes a wide section 23 and a narrow section 24. The narrow section 24 is located between two clearance holes 22. The projection of the wide section 23 along the first direction overlaps with the projection of the two clearance 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 clearance holes 22 along the first direction, and the narrow section 24 is located between the two clearance 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 exchange unit 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 exchange unit 20.

[0083] refer to Figure 1 , Figure 3 and Figure 7The battery pack 100 includes two rows of batteries 10 arranged along a first direction, and each row of batteries includes multiple pairs of batteries arranged along a second direction. A flow channel 21 is configured to exchange heat with the two pairs of batteries 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 flow 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 unit 20 and improves space utilization.

[0084] refer to Figure 7 and Figure 8 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 is provided with a plurality of recesses 25, which protrude 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 flow 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 provides recesses 25 on the second wide section 232. The recesses 25 can reduce the flow area of ​​the second wide section 232, reduce the degree of 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.

[0085] Furthermore, the projections of the plurality of recesses 25 along the first direction partially overlap with the projections of the first narrow segment 241 along the first direction, and the projections of the plurality of recesses 25 along the first direction partially overlap with the projections of the second narrow segment 242 along the first direction. When the heat exchange medium flows from the first narrow segment 241 to the second wide segment 232, or from the second wide segment 232 to the second narrow segment 242, the recesses 25 can reduce the flow area of ​​the second wide segment 232, reduce the abrupt change in the flow area of ​​the heat exchange medium along the flow path, reduce the probability of turbulence generation, and thus enable the heat exchange medium to flow smoothly.

[0086] As one possible implementation, refer to Figure 7The vertical projection of a portion of the plurality of recesses 25 overlaps with the vertical projection of the portion between the two batteries 10 in a pair of batteries 10. Thus, when the heat exchange medium flows from the first narrow section 241 to the second wide section 232, or from the second narrow section 242 to the third wide section 233, the flow path of the heat exchange medium bypasses a portion of the plurality of recesses 25; 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.

[0087] As one possible implementation, the orthographic projection area of ​​the multiple recesses 25 along the vertical direction is A1, in mm. 2 The orthographic projection area of ​​the second wide segment 232 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.

[0088] 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.

[0089] 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 232 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 unit 20.

[0090] It is understood that the shape of the recess can be implemented in various ways, and this utility model does not impose any particular limitation on it. As an example, see [reference]. Figure 7 A portion of the multiple recesses may be rectangular, extending along a first direction. As another example, a portion of the multiple recesses may be circular.

[0091] Furthermore, the projection of the circle along the first direction overlaps with the projection of the first narrow segment 241 along the first direction; and / or, the projection of the concave portion along the first direction overlaps with the projection of the second narrow segment 242 along the first direction. In this way, when flowing from the first narrow segment 241 to the second wide segment 232, the abrupt change in the flow area of ​​the heat exchange medium along the flow path is small, thereby enabling the heat exchange medium to flow smoothly.

[0092] As one possible implementation, the projected area of ​​the flow 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.

[0093] If the ratio of the projected area of ​​the flow 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 flow 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 clearance hole 22 is small, resulting in limited installation space for the explosion-proof valve 13.

[0094] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the flow 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 unit 20, and also reserve sufficient installation space for the explosion-proof valve 13.

[0095] As one possible implementation, the projected area of ​​the flow 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 0.5≤A3 / A4≤0.8, for example, A3 / A4 can be 0.5, 0.53, 0.56, 0.62, 0.66, 0.7 or 0.8.

[0096] If the ratio of the projected area of ​​the flow 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 flow 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 0.8, the area of ​​the clearance hole 22 is small, resulting in limited installation space for the explosion-proof valve 13.

[0097] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the flow 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 unit 20, and also reserve sufficient installation space for the explosion-proof valve 13.

[0098] <Example Electrical Equipment> refer to Figure 9 This utility model provides an electrical device 200, which includes a battery pack 100.

[0099] 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.

[0100] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0101] In a non-restrictive example, refer to Figure 9 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.

[0102] It should be understood that the term "comprising" and its variations as used in this disclosure 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".

[0103] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first edge and a second edge), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0104] The scope of protection of this disclosure is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: Multiple batteries (10), each battery (10) includes a housing (11), the bottom surface (12) of the housing (11) is provided with an explosion-proof valve (13), the size of the housing (11) in a first direction is larger than its size in a second direction, and the first direction, the second direction and the up and down direction are perpendicular to each other; as well as The heat exchange unit (20) includes a plurality of flow channels (21) and a plurality of clearance holes (22), the plurality of flow channels (21) extending along a first direction, and the plurality of clearance holes (22) spaced along a second direction and receiving explosion-proof valves (13) from the plurality of batteries (10), wherein, The battery pack (100) includes multiple pairs of batteries arranged along the second direction. Each pair of batteries corresponds to two clearance holes (22). Each clearance hole (22) includes a hole body (221) and an extension (222) extending toward another clearance hole (22). The two extensions (222) are spaced apart in the first direction. The flow channel (21) located between the two clearance holes (22) has a dimension D1 in the second direction, in mm. The minimum distance between the two extensions (222) in the second direction is D2, in mm, where D1 > D2.

2. The battery pack (100) according to claim 1, characterized in that, The dimension of the flow channel (21) located between the two clearance holes (22) in the second direction is D1, in mm, where 10mm≤D1≤30mm.

3. The battery pack (100) according to claim 1, characterized in that, The minimum distance between the two extensions (222) in the second direction is D2, in mm, where 8mm≤D2≤25mm.

4. The battery pack (100) according to claim 1, characterized in that, The flow channel (21) located between the two clearance holes (22) has a dimension of D1 in the second direction, in mm, and the minimum distance from the hole body (221) of each clearance hole (22) to the extension (222) of the other clearance hole (22) is D3, in mm, 0.25≤D1 / D3≤0.

75.

5. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the hole body (221) of each clearance hole (22) to the extension (222) of another clearance hole (22) is D3, in mm, where 25 mm ≤ D3 ≤ 40 mm.

6. The battery pack (100) according to claim 1, characterized in that, In the first direction, the dimension of the extension (222) is L1 in mm, and the dimension of the hole body (221) is W1 in mm, 0.1≤L1 / W1<0.

5.

7. The battery pack (100) according to claim 6, characterized in that, In the first direction, the dimension of the extension (222) is L1, in mm, where 10mm≤L1≤50mm.

8. The battery pack (100) according to claim 6, characterized in that, In the first direction, the size of the hole body (221) is W1, in mm, where 20mm≤W1≤100mm.

9. The battery pack (100) according to claim 1, characterized in that, The extensions (222) of the batteries (10) on both sides of the second direction have a larger dimension in the first direction than the extensions (222) of the middle battery (10) in the first direction.

10. The battery pack (100) according to claim 1, characterized in that, In the second direction, the dimension of the extension (222) is L2 in mm, and the dimension of the clearance hole (22) is W2 in mm, 0.11≤L2 / W2≤0.

75.

11. The battery pack (100) according to claim 10, characterized in that, In the second direction, the dimension of the extension (222) is L2 in mm, where 5 mm ≤ L2 ≤ 15 mm.

12. The battery pack (100) according to claim 10, characterized in that, In the second direction, the size of the clearance hole (22) is W2 in mm, where 20mm≤W2≤45mm.

13. The battery pack (100) according to claim 1, characterized in that, The extensions (222) of the batteries (10) on both sides of the second direction have a larger dimension in the second direction than the extensions (222) of the middle battery (10) in the second direction.

14. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance between the two extensions (222) is D4 in mm, and the size of the hole body (221) is W1 in mm, 0.08≤D4 / W1≤0.

4.

15. The battery pack (100) according to claim 14, characterized in that, In the first direction, the minimum distance between the two extensions (222) is D4, in mm, where 8 mm ≤ D4 ≤ 40 mm.

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

17. The battery pack (100) according to claim 16, characterized in that, The device includes two rows of batteries (10) arranged along the first direction, each row of batteries including multiple pairs of batteries (10) arranged along the second direction, the flow channel (21) is configured to exchange heat with the two pairs of batteries (10) arranged along the first direction, the wide section (23) includes a first wide section (231), a second wide section (232) and a third wide section (233), the narrow section (24) includes a first narrow section (241) and a second narrow section (242), the first narrow section (241) connects the first wide section (231) and the second wide section (232), and the second narrow section (242) connects the second wide section (232) and the third wide section (233).

18. The battery pack (100) according to claim 17, characterized in that, The wide segment (23) 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 plurality of recesses (25). The plurality of recesses (25) protrude from the second plate portion (235) toward the first plate portion (234). The projection of the plurality of recesses (25) along the first direction overlaps with the projection of the first narrow segment (241) along the first direction; and / or, the projection of the plurality of recesses (25) along the first direction overlaps with the projection of the second narrow segment (242) along the first direction.

19. The battery pack (100) according to claim 18, characterized in that, The projected area of ​​the plurality of recesses (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.

20. The battery pack (100) according to claim 18, characterized in that, A portion of the plurality of recesses (25) is a rectangle extending along the first direction.

21. The battery pack (100) according to claim 18, characterized in that, A portion of the plurality of recesses (25) is circular, and the projection of the circle along the first direction overlaps with the projection of the first narrow segment (241) along the first direction; and / or, the projection of the recess (25) along the first direction overlaps with the projection of the second narrow segment (242) along the first direction.

22. The battery pack (100) according to claim 1, characterized in that, The projected area of ​​the flow 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.

23. The battery pack (100) according to claim 1, characterized in that, The projected area of ​​the flow 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 , 0.5≤A3 / A4≤0.

8.

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

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