Battery pack and electric device with same

Abstract

The utility model relates to battery pack and electric equipment with it. Battery pack includes a plurality of batteries and heat exchange spare, and each battery includes the casing, and the casing is equipped with pressure -relief valve in one side in the up-down direction, and the size of casing in the first direction is greater than the size of casing in the second direction. Heat exchange spare and pressure -relief valve are located the same side in the up-down direction of casing and include a plurality of heat exchange flow channel and a plurality of containing hole, a plurality of heat exchange flow channel extends along the first direction, a plurality of containing hole is spaced along the second direction, and containing hole receives the pressure -relief valve of one battery in a plurality of batteries. Battery pack includes a plurality of pairs of batteries along the second direction, and heat exchange flow channel includes the narrow part between the two containing holes corresponding to a pair of batteries and the wide part in the projection along the first direction and the projection of two containing holes along the first direction partially overlaps, in the up-down direction, the size of wide part is H1mm, and the size of narrow part is H2mm, H1mm < H2mm to reduce the degree of abrupt change of overflow area.

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 pressure relief valves to release internal pressure. The presence of these valves restricts the layout of heat exchange channels in the heat exchange components, thereby reducing the cross-sectional area of ​​the 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, aiming to optimize the spatial arrangement of the heat exchange channels and improve the heat exchange effect of the heat exchange components.

[0005] The battery pack provided by this utility model includes multiple batteries and a heat exchanger. Each battery includes a housing with a pressure relief valve on one side in the vertical direction. The size of the housing in the first direction is larger than its size in the second direction, and the first, second, and vertical directions are perpendicular to each other. The heat exchanger and pressure relief valve are located on the same side of the housing in the vertical direction and include multiple heat exchange channels and multiple receiving holes. The multiple heat exchange channels extend along the first direction, and the multiple receiving holes are spaced apart along the second direction. Each receiving hole receives the pressure relief valve of one of the multiple batteries. The battery pack includes multiple pairs of batteries arranged along the second direction. The heat exchange channels include a narrow portion and a wide portion. The narrow portion is located between two receiving holes corresponding to a pair of batteries. The projection of the wide portion along the first direction overlaps with the projection of the two receiving holes along the first direction. In the vertical direction, the size of the wide portion is H1 mm, and the size of the narrow portion is H2 mm, where H1 < H2.

[0006] The beneficial effects of the battery pack provided by this utility model are as follows:

[0007] By setting the width of the section in the vertical direction to be smaller than that of the narrow section in the vertical direction, the abrupt change in the flow area can be reduced, thereby reducing the probability of flow separation and vortices caused by sudden expansion, allowing the heat exchange medium to flow smoothly and ensuring the heat exchange effect.

[0008] On the other hand, the present invention also provides an electrical device that includes the battery pack described in the first aspect. Attached Figure Description

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention.

[0014] Figure 2 yes Figure 1 A schematic diagram of the battery pack structure.

[0015] Figure 3 yes Figure 1 A bottom view of the battery pack.

[0016] Figure 4 yes Figure 1 A schematic diagram of the battery structure in the battery pack.

[0017] Figure 5 yes Figure 3 A schematic diagram of a part of the structure.

[0018] Figure 6 yes Figure 3 A schematic diagram of a part of the structure.

[0019] Figure 7 yes Figure 3 A schematic diagram of a part of the structure.

[0020] Figure 8 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0021] Figure 9 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0022] Figure 10 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0023] Figure 11 This is a schematic diagram of a portion of a battery pack according to another embodiment of the present invention.

[0024] Figure 12 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0025] Reference numerals: Battery pack-100; Battery-10; Housing-11; Pressure relief valve-12; Heat exchanger-20; Heat exchange channel-21; Receiving hole-22; Wide section-23; First wide section-231; Second wide section-232; Third wide section-233; First plate section-234; Second plate section-235; Narrow section-24; First narrow section-241; Second narrow section-242; Gentle slope-25; First gentle slope-251; Second gentle slope-252; Recess-26; Inlet-27; Outlet-28; Electrical equipment-200. Detailed Implementation

[0026] 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.

[0027] <Example Battery>

[0028] 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.

[0029] The battery 10 includes a housing 11 and battery cells (not shown) disposed within the housing 11.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 size of the housing 11 in the first direction is larger than its size in the second direction.

[0035] 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.

[0036] Continue to refer to Figure 4 A pressure relief valve 12 is provided at the bottom of the housing 11. The pressure relief valve 12 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 pressure relief valve 12 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.

[0037] It is understood that this utility model does not impose any special restrictions on the material of the pressure relief valve 12. As an example, the pressure relief valve 12 can be made of aluminum, steel, or an alloy.

[0038] It is understood that the present invention does not impose any particular restrictions on the shape of the pressure relief valve 12. For example, the shape of the pressure relief valve 12 can be one of square, oblong, elliptical and racetrack shape.

[0039] It is understood that this utility model does not impose any special restrictions on the type of pressure relief valve 12. For example, the pressure relief valve 12 can be a grooved pressure relief valve, or it can be formed by stamping or laser etching.

[0040] <Example Battery Pack>

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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. Specifically, when the operating temperature of the battery 10 is too low, the heat exchanger 20 is used to raise the temperature of the battery 10; when the operating temperature of the battery 10 is too high, the heat exchanger 20 is used to lower the temperature of the battery 10.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped.

[0050] 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.

[0051] In the current embodiment, reference is made to Figure 5 The heat exchanger 20 and the pressure relief valve 12 are located on the same side of the housing 11 in the vertical direction, and include a plurality of heat exchange channels 21 and a plurality of receiving holes 22. The plurality of heat exchange channels 21 extend along a first direction, and the plurality of receiving holes 22 are spaced along a second direction. Each receiving hole 22 receives the pressure relief valve 12 of one of the plurality of batteries 10.

[0052] refer to Figure 2 and Figure 5 The battery pack 100 includes multiple pairs of batteries 10 arranged along a second direction. Each heat exchange channel 21 includes a wide portion 23 and a narrow portion 24. The narrow portion 24 is located between two receiving holes 22 corresponding to a pair of batteries 10. The projection of the wide portion 23 along the first direction overlaps with the projection of the two receiving holes 22 along the first direction. In the vertical direction, the size of the wide portion 23 is H1 mm, and the size of the narrow portion 24 is H2 mm, where H1 mm < H2 mm.

[0053] Because the narrow portion 24 and the wide portion 23 of the heat exchange channel 21 have different dimensions in the second direction, the flow area of ​​the heat exchange medium will change abruptly when passing through the narrow portion 24 and the wide portion 23, resulting in uneven flow velocity distribution. Therefore, the battery pack 100 provided by this invention reduces the probability of flow separation and vortices caused by sudden expansion by setting the dimension of the wide portion 23 in the vertical direction to be smaller than that of the narrow portion 24 in the vertical direction, thereby enabling the heat exchange medium to flow smoothly and ensuring the heat exchange effect of the heat exchanger 20.

[0054] As one possible implementation, refer to Figure 8 In the vertical direction, the width of the portion 23 is H1 mm, where 2 mm ≤ H1 mm ≤ 4 mm. For example, H1 mm can be 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.3 mm, 3.7 mm, or 4 mm.

[0055] If the vertical dimension of the width portion 23 is too small, i.e., less than 2 mm, the flow area of ​​the heat exchange medium when flowing through the width portion 23 is small, which is detrimental to the heat exchange efficiency of the heat exchanger 20. If the vertical dimension of the width portion 23 is too large, i.e., greater than 4 mm, the flow area of ​​the heat exchange medium when flowing through the width portion 23 differs significantly from the flow area of ​​the heat exchange medium when passing through the width portion 23, resulting in uneven velocity distribution of the heat exchange medium when flowing from the width portion 23 to the narrow portion 24 or from the narrow portion 24 to the width portion 23.

[0056] According to the battery pack 100 provided by this utility model, the size of the wide portion 23 in the vertical direction is limited to the above-mentioned numerical range, which can reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly, and also ensure the heat exchange efficiency of the heat exchange medium when flowing through the wide portion 23.

[0057] As one possible implementation, refer to Figure 9 In the vertical direction, the dimension of the narrow portion 24 in the vertical direction is H2 mm, where 3.5 mm ≤ H2 mm ≤ 6 mm. For example, H2 mm can be 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 4 mm, 3 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5.2 mm, 5.6 mm, or 6 mm.

[0058] If the vertical dimension of the narrow section 24 is too small, i.e., less than 3.5 mm, the flow area of ​​the heat exchange medium flowing through the narrow section 24 will be small, resulting in a large difference in the flow area of ​​the heat exchange medium flowing through the wide section 23 and the narrow section 24. This will lead to uneven velocity distribution of the heat exchange medium flowing from the wide section 23 to the narrow section 24 or from the narrow section 24 to the wide section 23. If the vertical dimension of the narrow section 24 is too large, i.e., greater than 6 mm, the narrow section 24 will occupy more space in the vertical direction, which is not conducive to the space utilization of the battery pack 100.

[0059] According to the battery pack 100 provided by this utility model, the size of the narrow portion 24 in the vertical direction is limited to the above-mentioned numerical range, which 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, ensure the heat exchange efficiency of the heat exchange medium when flowing through the narrow portion 24, and limit the size of the heat exchange component 20 in the vertical direction to ensure the space utilization of the battery pack 100.

[0060] As one possible implementation, refer to Figure 8 and Figure 9 In the vertical direction, the width of the portion 23 is H1 mm, and the width of the portion 24 is H2 mm, with 1.5 ≤ H2 mm / H1 mm ≤ 3. For example, H2 mm / H1 mm can be 1.5, 1.8, 2, 2.2, 2.4, 2.6, 2.8, or 3.

[0061] If the ratio of the vertical dimension of the narrow portion 24 to the vertical dimension of the wide portion 23 is too small (less than 1.5), the flow area of ​​the heat exchange medium flowing through the narrow portion 24 is small, and the flow area of ​​the heat exchange medium flowing through the wide portion 23 and the narrow portion 24 differs significantly. This will result in uneven velocity distribution of the heat exchange medium flowing from the wide portion 23 to the narrow portion 24 or from the narrow portion 24 to the wide portion 23. If the ratio of the vertical dimension of the narrow portion 24 to the vertical dimension of the wide portion 23 is too large (greater than 3), the vertical dimension of the wide portion 23 is small. This will result in low heat exchange efficiency of the heat exchange medium flowing through the wide portion 23. In addition, the vertical dimension of the narrow portion 24 is large, which makes the heat exchange element 20 occupy a large dimension in the vertical direction, which is not conducive to the space utilization of the battery pack 100.

[0062] According to the battery pack 100 provided by this utility model, the ratio of the dimension of the narrow portion 24 in the vertical direction to the dimension of the wide portion 23 in 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, thereby enabling the heat exchange medium to flow smoothly. It can also ensure the heat exchange efficiency of the heat exchange medium when flowing through the wide portion 23. Furthermore, it can limit the dimension of the heat exchange element 20 in the vertical direction, thereby ensuring the space utilization rate of the battery pack 100.

[0063] As one possible implementation, the maximum cross-sectional area of ​​the width portion 23 in the section perpendicular to the first direction is A1 mm. 2 The maximum cross-sectional area of ​​the narrow section 24 is A2 mm. 2 ,2≤A1 mm 2 / A2 mm 2 ≤11. For example, A1 mm 2 / A2mm 2 It can be 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[0064] If the maximum cross-sectional area of ​​the wide portion 23 perpendicular to the first direction is too small (less than 2), the ratio of the maximum cross-sectional area of ​​the wide portion 23 perpendicular to the first direction is small, which will result in low heat exchange efficiency of the heat exchange medium flowing through the wide portion 23. If the ratio of the maximum cross-sectional area of ​​the wide portion 23 perpendicular to the first direction to the maximum cross-sectional area of ​​the narrow portion 24 perpendicular to the first direction is too large (greater than 11), the flow area of ​​the heat exchange medium passing through the wide portion 23 and the narrow portion 24 differs significantly, which will result in uneven velocity distribution of the heat exchange medium flowing from the wide portion 23 to the narrow portion 24 or from the narrow portion 24 to the wide portion 23.

[0065] According to the battery pack 100 provided by this utility model, the ratio of the maximum cross-sectional area of ​​the wide portion 23 in the cross-section perpendicular to the first direction to the maximum cross-sectional area of ​​the narrow portion 24 in the cross-section perpendicular to the first 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, thereby enabling the heat exchange medium to flow smoothly, and also ensure the heat exchange efficiency of the heat exchange medium when flowing through the wide portion 23.

[0066] As one possible implementation, the maximum cross-sectional area of ​​the width portion 23 in the section perpendicular to the first direction is A1 mm. 2 60mm 2 ≤A1 mm 2 ≤320mm 2 For example, A1 mm 2 It can be 60mm 2 80mm 2 100mm 2 120mm 2 140mm 2 160mm 2 180mm 2 200mm 2 220mm 2 240mm 2260mm 2 280mm 2 300mm 2 Or 320mm 2 .

[0067] If the maximum cross-sectional area of ​​the width portion 23 in the section perpendicular to the first direction is too small, i.e. less than 60 mm 2 This will result in lower heat exchange efficiency of the heat exchange medium flowing through the wide section 23. If the maximum cross-sectional area of ​​the wide section 23 in the section perpendicular to the first direction is too large, i.e. greater than 320 mm², this will also lead to lower heat exchange efficiency. 2 If the flow area of ​​the heat exchange medium is significantly different when it passes through the wide section 23 and the narrow section 24, it will result in uneven flow velocity distribution when the heat exchange medium flows from the wide section 23 to the narrow section 24 or from the narrow section 24 to the wide section 23.

[0068] According to the battery pack 100 provided by this utility model, the maximum cross-sectional area of ​​the wide portion 23 in the section perpendicular to the first 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, thereby enabling the heat exchange medium to flow smoothly, and also ensure the heat exchange efficiency of the heat exchange medium when flowing through the wide portion 23.

[0069] As one possible implementation, the maximum cross-sectional area of ​​the narrow portion 24 in a section perpendicular to the first direction is A2 mm. 2 28mm 2 ≤A2 mm 2 ≤120mm 2 For example, A2 mm 2 It can be 28mm 2 35mm 2 40mm 2 45mm 2 50mm 2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm 2 90mm 2 95mm 2 100mm 2 105mm 2 110mm 2 115mm 2 Or 120mm 2 .

[0070] If the maximum cross-sectional area of ​​the narrow portion 24 in the section perpendicular to the first direction is too small, i.e. less than 28 mm 2 If the maximum cross-sectional area of ​​the narrow section 24 perpendicular to the first direction is small, the flow area of ​​the heat exchange medium passing through the wide section 23 and the narrow section 24 will differ significantly. This will lead to uneven velocity distribution of the heat exchange medium flowing from the wide section 23 to the narrow section 24 or from the narrow section 24 to the wide section 23. If the maximum cross-sectional area of ​​the narrow section 24 perpendicular to the first direction is too large, i.e., greater than 120 mm², then... 2 If the narrow portion 24 is large in the vertical direction, the heat exchanger 20 will occupy a large size in the vertical direction, which is not conducive to the space utilization of the battery pack 100. Alternatively, if the narrow portion 24 is large in the second direction, the installation space of the pressure relief valve 12 will be limited.

[0071] According to the battery pack 100 provided by this utility model, the maximum cross-sectional area of ​​the narrow portion 24 in the section perpendicular to the first direction is limited to the above-mentioned numerical range. This ensures that the heat exchange medium can flow smoothly from the wide portion 23 to the narrow portion 24 or from the narrow portion 24 to the wide portion 23, and also limits the size of the narrow portion 24 in the vertical and second directions, thus ensuring the installation space of the pressure relief valve 12 and the space utilization rate of the battery pack 100.

[0072] refer to Figure 5 The maximum dimension of the wide portion 23 in the second direction is D1 mm, and the dimension of the narrow portion 24 in the second direction is D2 mm, where 0.1 ≤ D2 mm / D1 mm ≤ 0.5. For example, D2 mm / D1 mm can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5.

[0073] If the ratio of the dimension of the narrow portion 24 in the second direction to the maximum dimension of the width portion 23 in the second direction is too small, i.e., less than 0.1, then the dimension of the narrow portion 24 in the second direction is small. As a result, the heat exchange medium is prone to form vortices in the transition area from the narrow portion 24 to the width portion 23, leading to uneven flow 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 narrow portion 24 in the second direction to the maximum dimension of the width portion 23 in the second direction is too large, i.e., greater than 0.5, then the dimension of the width portion 23 in the second direction is small. As a result, the heat exchange area between the width portion 23 and the casing 11 of the battery 10 is also small, and the heat exchange effect of the heat exchanger 20 is poor.

[0074] According to the battery pack 100 provided by this utility model, the ratio of the size of the narrow portion 24 in the second direction to the maximum size of the wide portion 23 in the second direction 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 narrow portion 24 to the wide portion 23 more uniform, and can also ensure the heat exchange area between the wide portion 23 and the housing 11 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0075] refer to Figure 5 The maximum dimension of the width 23 in the second direction is D1 mm, where 30 mm ≤ D1 mm ≤ 80 mm. For example, D1 mm can be 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm or 80 mm.

[0076] If the maximum dimension of the wide portion 23 in the second direction is too small, i.e. less than 30 mm, the heat exchange area between the wide portion 23 and the casing 11 of the battery 10 will also be small, resulting in poor heat exchange performance of the heat exchange element 20. If the maximum dimension of the wide portion 23 in the second direction is too large, i.e. greater than 80 mm, the heat exchange medium is prone to forming vortices in the transition area from the narrow portion 24 to the wide portion 23, leading to uneven flow velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchange element 20.

[0077] According to the battery pack 100 provided by this utility model, the maximum size of the wide portion 23 in the second direction is limited to the above-mentioned numerical range, which can make the flow velocity distribution of the heat exchange medium in the transition area from the narrow portion 24 to the wide portion 23 more uniform, and can also ensure the heat exchange area between the wide portion 23 and the casing 11 of the battery 10, thereby ensuring the heat exchange effect.

[0078] refer to Figure 5 The narrow portion 24 has a dimension of D2 mm in the second direction, where 8 mm ≤ D2 mm ≤ 20 mm. For example, D2 mm can be 8 mm, 12 mm, 14 mm, 16 mm, 18 mm, or 20 mm.

[0079] If the narrow portion 24 is too small in the second direction, i.e., less than 8 mm, then the narrow portion 24 is too small. As a result, the heat exchange medium is prone to form vortices in the transition area from the narrow portion 24 to the wide portion 23, leading to uneven flow velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchange element 20. If the narrow portion 24 is too large in the second direction, i.e., greater than 20 mm, then the narrow portion 24 is too large, which will restrict the installation space of the pressure relief valve 12.

[0080] According to the battery pack 100 provided by this utility model, the size of the narrow portion 24 in the second direction is limited to the above-mentioned numerical range, which can make the flow velocity distribution of the heat exchange medium in the area where the narrow portion 24 transitions to the wide portion 23 more uniform, and can also ensure the installation space of the pressure relief valve 12.

[0081] refer to Figure 5 The maximum dimension of the width portion 23 in the second direction is D1 mm, and the dimension of each battery 10 in each pair of batteries 10 in the second direction is W mm, where 1.2 ≤ D1 mm / W mm ≤ 1.8. For example, D1 mm / W mm can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8.

[0082] If the ratio of the maximum dimension of the width portion 23 in the second direction to the dimension of each battery 10 in the second direction of each pair of batteries 10 is too small, i.e., less than 1.2, then the dimension of the width portion 23 in the second direction is small. Consequently, the heat exchange area between the width portion 23 and the casing 11 of the battery 10 is also small, resulting in poor heat exchange performance of the heat exchanger 20. If the ratio of the maximum dimension of the width portion 23 in the second direction to the dimension of each battery 10 in the second direction of each pair of batteries 10 is too large, i.e., greater than 1.8, then the dimension of the width portion 23 in the second direction is large, and the width portions 23 of adjacent battery pairs 10 may interfere with each other.

[0083] According to the battery pack 100 provided by this utility model, the ratio of the maximum dimension of the width portion 23 in the second direction to the dimension of each battery 10 in the second direction in each pair of batteries 10 is limited to the above-mentioned numerical range. This ensures the heat exchange area between the width portion 23 and the housing 11 of the battery 10, and also avoids the possibility of interference between the width portions 23 of adjacent battery pairs 10.

[0084] refer to Figure 8 and Figure 9 The heat exchange channel 21 is spaced between a first plate portion 234 and a second plate portion 235 in the vertical direction. The first plate portion 234 is closer to the bottom end face than the second plate portion 235. Figure 10 The second plate portion 235 of the wide portion 23 and the second plate portion 235 of the narrow portion 24 are connected by a gentle slope surface 25. Along the direction from the wide portion 23 to the narrow portion 24, the dimensions of the gentle slope surface 25 and the first plate portion 234 gradually increase in the vertical direction. According to the battery pack 100 provided by this utility model, by providing a gradually changing gentle slope surface 25, the flow transition of fluid between the wide portion 23 and the narrow portion 24 can be smoothly guided, thereby reducing the probability of eddies caused by changes in the flow cross section.

[0085] refer to Figure 10The gentle slope surface 25 includes two first gentle slope surfaces 251 spaced apart along the second direction and a second gentle slope surface 252 connecting the two first gentle slope surfaces 251. The two first gentle slope surfaces 251 are respectively connected to the edge of the narrow portion 24 in the second direction. Compared with a gentle slope surface 25 extending along the second direction, the gentle slope surface 25 of the battery pack 100 provided by this utility model has two first gentle slope surfaces 251 and a second gentle slope surface 252, which can make the flow path of the heat exchange medium from the wide portion 23 to the narrow portion 24 smoother and more natural, and ensure that the flow rate of the heat exchange medium is uniform and stable.

[0086] refer to Figure 5 and Figure 10 In the first direction, the dimension of each first gentle slope 251 is L1 mm, and the dimension of the width 23 is L2 mm, where 0.004 ≤ L1 mm / L2 mm ≤ 0.3. For example, L1 mm / L2 mm can be 0.004, 0.012, 0.02, 0.04, 0.06, 0.08, 0.1, 0.15, 0.2, 0.25, or 0.3.

[0087] If the ratio of the dimension of the first gentle slope 251 in the first direction to the dimension of the width 23 in the first direction is too small, less than 0.004, the heat exchange medium is prone to forming vortices in the transition area from the width 23 to the narrowness 24, resulting in uneven velocity distribution of the heat exchange medium. If the ratio of the dimension of the first gentle slope 251 in the first direction to the dimension of the width 23 in the first direction is too large, greater than 0.3, the flow area of ​​the heat exchange medium when flowing through the width 23 differs significantly from the flow area of ​​the heat exchange medium when passing through the width 23, resulting in uneven velocity distribution of the heat exchange medium when flowing from the width 23 to the narrowness 24 or from the narrowness 24 to the width 23.

[0088] According to the battery pack 100 provided by this utility model, the ratio of the size of the first gentle slope surface 251 in the first direction to the size of the width portion 23 in the first direction is limited to the above-mentioned numerical range. This can reduce the probability that the heat exchange medium is prone to forming vortices in the area where the width portion 23 transitions to the narrow portion 24, and also reduce the degree of abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly.

[0089] refer to Figure 5 In the first direction, the dimension of each first gentle slope surface 251 is L1 mm, where 0.5 mm ≤ L1 mm ≤ 10 mm. For example, L1 mm can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0090] If the dimension of the first gentle slope 251 in the first direction is too small, less than 0.5 mm, the heat exchange medium is prone to forming vortices in the transition area from the wide portion 23 to the narrow portion 24, resulting in uneven velocity distribution of the heat exchange medium. If the dimension of the first gentle slope 251 in the first direction is too large, greater than 10 mm, the flow area of ​​the heat exchange medium when flowing through the wide portion 23 differs significantly from that when flowing through the wide portion 23, resulting in uneven velocity distribution of the heat exchange medium when flowing from the wide portion 23 to the narrow portion 24 or from the narrow portion 24 to the wide portion 23.

[0091] According to the battery pack 100 provided by this utility model, the size of the first gentle slope 251 in the first direction is limited to the above-mentioned numerical range, which can reduce the probability that the heat exchange medium is prone to forming vortices in the area where the wide part 23 transitions to the narrow part 24, and also reduce the degree of abrupt change in the flow area of ​​the heat exchange medium in the flow path, so that the heat exchange medium can flow smoothly.

[0092] refer to Figure 10 The width of the portion 23 in the first direction is L2 mm, where 30 mm ≤ L2 mm ≤ 120 mm. For example, L2 mm can be 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, or 120 mm.

[0093] If the width 23 is too small in the first direction, less than 30 mm, the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is small, resulting in poor heat exchange performance. If the width 23 is too large in the first direction, greater than 120 mm, the receiving hole 22 is too small in the first direction, which limits the installation space of the pressure relief valve 12. According to the battery pack 100 provided by this utility model, limiting the size of the first gentle slope 251 in the first direction to the above-mentioned numerical range ensures both the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 and the installation space of the pressure relief valve 12.

[0094] refer to Figure 2 , Figure 6 and Figure 7The battery pack 100 includes two rows of batteries 10 arranged along a first direction. Each row of battery packs 100 includes multiple pairs of batteries 10 arranged along a second direction. Each heat exchange channel 21 is configured to exchange heat with the two pairs of batteries 10 arranged along the first direction. The wide portion 23 includes a first wide portion 231, a second wide portion 232, and a third wide portion 233. The narrow portion 24 includes a first narrow portion 241 and a second narrow portion 242. The first narrow portion 241 connects the first wide portion 231 and the second wide portion 232. The second narrow portion 242 connects the second wide portion 232 and the third wide portion 233. According to the battery pack 100 provided by this utility model, the heat exchange channel 21 only needs to be connected to one inlet and one outlet to form a complete heat exchange path and exchange heat with the two pairs of batteries 10 arranged along the second direction. This implementation method can simplify the structure of the heat exchange component 20 and improve space utilization.

[0095] refer to Figure 8 The second wide portion 232 also includes a recess 26, which protrudes from the second plate portion 235 of the second wide portion 232 toward the first plate portion 234 of the second wide portion 232. Because the wide portion 23 and the narrow portion 24 of the heat exchange channel 21 have different dimensions in the second direction, the flow area of ​​the heat exchange medium will change abruptly, resulting in uneven flow velocity distribution. Therefore, the battery pack 100 provided by this invention has a recess 26 on the second wide portion 232. The recess 26 can reduce the flow area of ​​the second wide portion 232, reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly.

[0096] refer to Figure 6 and Figure 7 In the first direction, the projection of the recess 26 along the first direction partially overlaps with the projection of the first narrow portion 241 along the first direction. When the heat exchange medium flows from the first narrow portion 241 to the second wide portion 232, the flow path of the heat exchange medium bypasses the two recesses 26. 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.

[0097] Continue to refer to Figure 6 and Figure 7 The projection of the recess 26 along the first direction partially overlaps with the projection of the second narrow portion 242 along the first direction. When the heat exchange medium flows from the second wide portion 232 to the second narrow portion 242, the recess 26 can reduce the flow area of ​​the second wide portion 232, reduce the abrupt change in the flow area of ​​the heat exchange medium on the flow path, reduce the probability of turbulence, and thus enable the heat exchange medium to flow smoothly.

[0098] As one possible implementation, the orthographic projection area of ​​the recess 26 along the vertical direction is A3 mm. 2 The projected area of ​​the second width portion 232 along the vertical direction is A4 mm. 20.1≤A3 mm 2 / A4 mm 2 ≤0.6. For example, A3 mm 2 / A4 mm 2 It can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.5 or 0.6.

[0099] If the ratio of the vertical projected area of ​​the heat exchange channel 21 to the vertical projected area of ​​the housing 11 of the two pairs of batteries 10 is too small (less than 0.1), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is small, resulting in poor heat exchange performance. If the ratio of the vertical projected area of ​​the heat exchange channel 21 to the vertical projected area of ​​the housing 11 of the two pairs of batteries 10 is too large (greater than 0.6), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is large, which results in a smaller area of ​​the receiving hole 22, thus limiting the installation space of the pressure relief valve 12.

[0100] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the heat exchange channel 21 in the vertical direction to the projected area of ​​the shell 11 of the two pairs of batteries 10 in the vertical direction is limited to the above-mentioned numerical range. This can ensure the contact area between the heat exchange medium and the shell 11 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the pressure relief valve 12.

[0101] refer to Figure 7 The heat exchange channel 21 includes an inlet 27 and an outlet 28. The inlet 27 is located on the side of the first wide portion 231 away from the first narrow portion 241, and the outlet 28 is located on the side of the third wide portion 233 away from the second narrow portion 242. In the first direction, the projection of the inlet 27 along the first direction overlaps with the projection of one of the batteries 10 in the pair of batteries 10 corresponding to the heat exchange channel 21 along the first direction, and the projection of the outlet 28 along the first direction overlaps with the projection of one of the batteries 10 in the pair of batteries 10 corresponding to the heat exchange channel 21 along the first direction.

[0102] If the projection of outlet 28 along the first direction overlaps with the projection of the gap between the pair of batteries 10 along the first direction, the flow velocity of the heat exchange medium is low in the portions of the first width 231 and the third width 233 located on both sides of the second direction, which is detrimental to heat exchange efficiency. According to the battery pack 100 provided by this utility model, the heat exchange medium can flow smoothly during the flow through the first width 231 and the third width 233 to ensure the heat exchange effect of the heat exchange element 20.

[0103] Continue to refer to Figure 7In the second direction, the maximum dimension of the width portion 23 is D1 mm, and the minimum distance from the inlet 27 to the edge of the first width portion 231 is D3 mm, where 0.12 ≤ D3 mm / D1 mm ≤ 0.9. For example, D3 mm / D1 mm can be 0.12, 0.18, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.

[0104] If the ratio of the minimum distance from the inlet 27 to the edge of the first width portion 231 to the maximum size of the width portion 23 is too small (less than 0.12) or too large (greater than 0.9), the heat exchange medium will have a low flow velocity when flowing through the portion of the first width portion 231 that is away from the inlet 27 in the second direction, which is detrimental to heat exchange efficiency. According to the battery pack 100 provided by this utility model, by limiting the ratio of the minimum distance from the inlet 27 to the edge of the first width portion 231 to the maximum size of the width portion 23 within the aforementioned range, the heat exchange medium can flow smoothly through the first width portion 231, ensuring the heat exchange effect of the heat exchange element 20.

[0105] Continue to refer to Figure 7 In the second direction, the maximum dimension of the width portion 23 is D1 mm, and the minimum distance from the outlet 28 to the edge of the third width portion 233 is D4 mm, where 0.12 ≤ D4 mm / D1 mm ≤ 0.9. For example, D4 ​​mm / D1 mm can be 0.12, 0.18, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.

[0106] If the ratio of the minimum distance from the outlet 28 to the edge of the third width portion 233 to the maximum dimension of the width portion 23 is too small (less than 0.12) or too large (greater than 0.9), the heat exchange medium will have a low flow velocity when flowing through the portion of the third width portion 233 that is away from the outlet 28 in the second direction, which is detrimental to heat exchange efficiency. According to the battery pack 100 provided by this utility model, by limiting the ratio of the minimum distance from the outlet 28 to the edge of the third width portion 233 to the maximum dimension of the width portion 23 to the above-mentioned value range, the heat exchange medium can flow smoothly during its flow through the third width portion 233, thus ensuring the heat exchange effect of the heat exchange element 20.

[0107] refer to Figure 11 The pressure relief valves 12 of two adjacent battery pairs 10 that are close to each other do not overlap at least partially in the orthogonal projection along the second direction. This increases the distance between the two pressure relief valves 12, thereby effectively reducing the impact of one pressure relief valve 12 bursting on the other pressure relief valve 12 and improving the safety of the battery pack 100.

[0108] <Example Electrical Equipment>

[0109] refer to Figure 12This utility model provides an electrical device 200, which includes a battery pack 100.

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

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

[0112] In a non-restrictive example, refer to Figure 12 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

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

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

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

Claims

1. A battery pack (100), characterized in that, include: Multiple batteries (10), each battery (10) includes a housing (11), the housing (11) having a pressure relief valve (12) on one side in the vertical direction, the housing (11) having a larger dimension in a first direction than in a second direction, the first direction, the second direction and the vertical direction being perpendicular to each other; as well as A heat exchanger (20) and a pressure relief valve (12) are located on the same side of the housing (11) in the vertical direction, and include a plurality of heat exchange channels (21) and a plurality of receiving holes (22). The plurality of heat exchange channels (21) extend along the first direction, and the plurality of receiving holes (22) are spaced along the second direction. The receiving holes (22) receive the pressure relief valve (12) of one of the plurality of batteries (10). The battery pack (100) includes a plurality of pairs of batteries (10) arranged along the second direction. The heat exchange channel (21) includes a wide portion (23) and a narrow portion (24). The narrow portion (24) is located between two receiving holes (22) corresponding to a pair of batteries (10). The projection of the wide portion (23) along the first direction partially overlaps with the projection of the two receiving holes (22) along the first direction. In the vertical direction, the dimension of the wide portion (23) is H1. mm, the size of the narrow portion (24) is H2 mm, H1 mm < H2 mm.

2. The battery pack (100) according to claim 1, characterized in that, In the vertical direction, the width of the width portion (23) is H1 mm, where 2 mm ≤ H1 mm ≤ 4 mm.

3. The battery pack (100) according to claim 1, characterized in that, In the vertical direction, the narrow portion (24) has a dimension of H2 mm, where 3.5 mm ≤ H2 mm ≤ 6 mm.

4. The battery pack (100) according to claim 1, characterized in that, In the vertical direction, the width of the wide portion (23) is H1 mm and the width of the narrow portion (24) is H2 mm, and 1.5 ≤ H2 mm / H1 mm ≤ 3.

5. The battery pack (100) according to claim 1, characterized in that, On a cross section perpendicular to the first direction, the maximum cross-sectional area of ​​the wide portion (23) is A1 mm. 2 The maximum cross-sectional area of ​​the narrow portion (24) is A2 mm. 2 ,2≤A1 mm 2 / A2 mm 2 ≤11.

6. The battery pack (100) according to claim 5, characterized in that, On a cross section perpendicular to the first direction, the maximum cross-sectional area of ​​the wide portion (23) is A1 mm. 2 60mm 2 ≤A1 mm 2 ≤320mm 2 .

7. The battery pack (100) according to claim 5, characterized in that, On a cross-section perpendicular to the first direction, the maximum cross-sectional area of ​​the narrow portion (24) is A² mm. 2 28mm 2 ≤A2 mm 2 ≤120mm 2 .

8. The battery pack (100) according to claim 1, characterized in that, The maximum dimension of the wide portion (23) in the second direction is D1 mm, and the dimension of the narrow portion (24) in the second direction is D2 mm, 0.1≤D2 mm / D1 mm≤0.

5.

9. The battery pack (100) according to claim 8, characterized in that, The maximum dimension of the width portion (23) in the second direction is D1 mm, 30 mm ≤ D1 mm ≤ 80 mm.

10. The battery pack (100) according to claim 8, characterized in that, The narrow portion (24) has a dimension of D2 mm in the second direction, where 8 mm ≤ D2 mm ≤ 20 mm.

11. The battery pack (100) according to claim 1, characterized in that, The maximum dimension of the width portion (23) in the second direction is D1 mm, and the dimension of each battery (10) in each pair of batteries (10) in the second direction is W mm, 1.2≤D1 mm / W mm≤1.

8.

12. The battery pack (100) according to claim 8, characterized in that, The heat exchange channel (21) is spaced by a first plate portion (234) and a second plate portion (235) along the vertical direction. The first plate portion (234) is closer to the shell (11) than the second plate portion (235). The second plate portion (235) of the wide portion (23) and the second plate portion (235) of the narrow portion (24) are connected by a gentle slope surface (25). Along the direction from the wide portion (23) to the narrow portion (24), the distance of the gentle slope surface (25) to the first plate portion (234) along the vertical direction gradually increases.

13. The battery pack (100) according to claim 12, characterized in that, The gentle slope (25) includes two first gentle slopes (251) spaced apart along the second direction and a second gentle slope (252) connecting the two first gentle slopes (251), the two first gentle slopes (251) respectively connecting to the edge of the narrow portion (24) in the second direction.

14. The battery pack (100) according to claim 13, characterized in that, In the first direction, the size of each first gentle slope (251) is L1 mm, the size of the width (23) is L2 mm, and 0.004≤L1 mm / L2 mm≤0.

3.

15. The battery pack (100) according to claim 13, characterized in that, In the first direction, the size of each first gentle slope surface (251) is L1 mm, 0.5 mm ≤ L1 mm ≤ 10 mm.

16. The battery pack (100) according to claim 13, characterized in that, In the first direction, the width (23) has a dimension of L2 mm, 30 mm ≤ L2 mm ≤ 120 mm.

17. The battery pack (100) according to claim 12, 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, each heat exchange channel (21) configured to exchange heat with the two pairs of batteries (10) arranged along the first direction, the wide portion (23) including a first wide portion (231), a second wide portion (232) and a third wide portion (233), the narrow portion (24) including a first narrow portion (241) and a second narrow portion (242), the first narrow portion (241) connecting the first wide portion (231) and the second wide portion (232), and the second narrow portion (242) connecting the second wide portion (232) and the third wide portion (233).

18. The battery pack (100) according to claim 17, characterized in that, The second wide portion (232) also includes a recess (26) that protrudes from the second plate portion (235) of the second wide portion (232) toward the first plate portion (234) of the second wide portion (232).

19. The battery pack (100) according to claim 18, characterized in that, In the first direction, the projection of the recess (26) along the first direction overlaps with the projection of the first narrow portion (241) along the first direction; and / or, the projection of the recess (26) along the first direction overlaps with the projection of the second narrow portion (242) along the first direction.

20. The battery pack (100) according to claim 18, characterized in that, The projected area of ​​the recess (26) along the vertical direction is A3 mm. 2 The projected area of ​​the second wide portion (232) along the vertical direction is A4 mm. 2 0.1≤A3 mm 2 / A4 mm 2 ≤0.

6.

21. The battery pack (100) according to claim 17, characterized in that, The heat exchange channel (21) includes an inlet (27) and an outlet (28). The inlet (27) is located on the side of the first wide portion (231) away from the first narrow portion (241), and the outlet (28) is located on the side of the third wide portion (233) away from the second narrow portion (242). In the first direction, the projection of the inlet (27) along the first direction overlaps with the projection of one of the batteries (10) in the pair of batteries (10) corresponding to the heat exchange channel (21) along the first direction, and the projection of the outlet (28) along the first direction overlaps with the projection of one of the batteries (10) in the pair of batteries (10) corresponding to the heat exchange channel (21) along the first direction.

22. The battery pack (100) according to claim 21, characterized in that, In the second direction, the minimum distance from the inlet (27) to the edge of the first width portion (231) is D3 mm, 0.12≤D3 mm / D1 mm≤0.

9.

23. The battery pack (100) according to claim 21, characterized in that, In the second direction, the minimum distance from the outlet (28) to the edge of the third width portion (233) is D4 mm, 0.12≤D4 mm / D1 mm≤0.

9.

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

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