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 comprises a plurality of batteries and a heat exchange member. The battery comprises a shell, and two explosion-proof valves are arranged on the bottom end surface of the shell. The two explosion-proof valves are spaced apart in a first direction, and the plurality of batteries are arranged in a second direction. The heat exchange member comprises a flow channel and a plurality of mounting holes. The plurality of mounting holes receive the explosion-proof valves of the plurality of batteries. The flow channel extends in the second direction and is located between two of the mounting holes. The extension direction of the two mounting holes forms an angle with the second direction. The up-down direction, the first direction and the second direction are perpendicular to each other in pairs. The arrangement of the flow channel is provided with sufficient space by arranging the two explosion-proof valves in the first direction. In addition, the extension direction of the mounting hole is arranged to form an angle with the second direction, so that the mounting hole can obtain a larger area. This implementation can increase the size of the flow channel in the first direction while ensuring the pressure relief capacity of the explosion-proof valve.

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

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

[0004] In view of this, the present 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 components.

[0005] The battery pack disclosed herein includes multiple batteries and a heat exchanger. Each battery includes a housing with two explosion-proof valves spaced apart in a first direction. The multiple batteries are arranged along a second direction. The heat exchanger includes a flow channel and multiple mounting holes. The mounting holes receive the explosion-proof valves of the multiple batteries. The flow channel extends along the second direction and is located between two of the mounting holes. The extending directions of the two mounting holes form an angle with the second direction, and the vertical direction, the first direction, and the second direction are all perpendicular to each other.

[0006] The beneficial effects of the battery pack provided by this utility model are as follows: The two explosion-proof valves are spaced apart along the first direction, providing ample space for the flow channel arrangement. Furthermore, setting the extension direction of the mounting hole at an angle to the second direction allows for a larger mounting hole area. This implementation increases the size of the flow channel in the first direction while ensuring the pressure relief capacity of the explosion-proof valves.

[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 bottom view of the battery pack.

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

[0015] Figure 4 yes Figure 3 A schematic diagram of a part of the structure.

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

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

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

[0019] Reference numerals: Battery pack-100; Battery-10; Housing-11; Bottom surface-12; Explosion-proof valve-13; Heat exchanger-20; Flow channel-21; First sub-flow channel-211; Second sub-flow channel-212; Third sub-flow channel-213; Mounting hole-22; First plate-231; Second plate-232; Recess-24; First recess-241; Second recess-242; Electrical equipment-200. Detailed Implementation

[0020] 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.

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

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

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

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

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

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

[0027] In the current embodiment, the battery cell is cuboid in shape, and the housing 11 is a rigid cuboid-shaped shell to house the battery cell. The housing 11 has a larger dimension in the first direction than in the second direction.

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

[0029] Continue to refer to Figure 3An explosion-proof valve 13 is provided at the bottom of the housing 11. 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.

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

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

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

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

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

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

[0036] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 2 The battery pack 100 also includes a heat exchanger 20, which is used to dissipate heat from the battery 10 to regulate the temperature of the battery 10.

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

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

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

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

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

[0042] In the current embodiment, reference Figures 1 to 3The bottom end face 12 of the housing 11 is provided with two explosion-proof valves 13, which are spaced apart in a first direction, and multiple batteries 10 are arranged along a second direction. The heat exchanger 20 includes a flow channel 21 and multiple mounting holes 22, which receive the explosion-proof valves 13 of the multiple batteries 10. The flow channel 21 extends along the second direction and is located between two of the multiple mounting holes 22, and the extending directions of the two mounting holes 22 form an angle with the second direction.

[0043] By arranging the two explosion-proof valves 13 at intervals along the first direction, a larger area is formed between the two explosion-proof valves 13, providing ample space for the arrangement of the flow channel 21. Furthermore, compared to the extension direction of the mounting hole 22 being parallel to the second direction, setting the extension direction of the mounting hole 22 to form an angle with the second direction allows the mounting hole 22 to have a larger area. According to the battery pack 100 provided by this utility model, the size of the flow channel in the first direction can be increased while ensuring the pressure relief capacity of the explosion-proof valves 13. This implementation helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the heat exchange performance of the heat exchange element 20.

[0044] Further, refer to Figure 4 The bottom end face 12 of the housing 11 includes two first edges 121 spaced apart along a first direction. The angle formed by the mounting hole 22 and the first edge 121 adjacent to the mounting hole 22 is B, in degrees, where 15°≤B≤60°. For example, B can be 15°, 18°, 21°, 24°, 28°, 32°, 36°, 42°, 48°, 52°, 56°, or 60°.

[0045] If the angle formed by the mounting hole 22 and the first edge 121 adjacent to the mounting hole 22 is too small, i.e., less than 15°, the area of ​​the mounting hole 22 will be small, resulting in a small area of ​​the explosion-proof valve 13. Consequently, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 will be insufficient, failing to release the internal pressure or temperature in time, easily leading to deformation or even explosion of the battery 10, thus posing a serious safety hazard. If the angle formed by the mounting hole 22 and the first edge 121 adjacent to the mounting hole 22 is too large, i.e., greater than 60°, the size of the mounting hole 22 in the first direction will increase, thereby compressing the arrangement space of the flow channel 21 in the first direction, reducing the contact area between the flow channel 21 and the bottom surface 12 of the battery 10, which is detrimental to the heat exchange effect of the heat exchanger 20.

[0046] The battery pack 100 provided by this utility model limits the angle between the mounting hole 22 and the first edge 121 adjacent to the mounting hole 22 to the above-mentioned numerical range, which can ensure both the arrangement space of the flow channel 21 in the first direction and the area of ​​the mounting hole 22, thereby ensuring the pressure relief capacity of the explosion-proof valve 13.

[0047] It should be noted that the vertex of the angle formed by the mounting hole 22 and the first edge 121 is the intersection of the extension line of the first edge 121 and the extension line of the mounting hole 22. This angle is greater than 0° and less than 180° formed by the extension line of the first edge 121 and the extension line of the mounting hole 22.

[0048] refer to Figure 4 In the first direction, the minimum distance from the mounting hole 22 to the flow channel 21 is D1, in mm, and the size of the housing 11 is W1, in mm, where 0.02 ≤ D1 / W1 ≤ 0.08. For example, D1 / W1 can be 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.06, 0.07, or 0.08.

[0049] If the ratio of the minimum distance from the mounting hole 22 along the first direction to the flow channel 21 to the dimension of the battery 10 in the first direction is too small (less than 0.02), the distance between the flow channel 21 and the mounting hole 22 will be small, resulting in a smaller allowable error during processing and increased manufacturing difficulty. If the ratio of the minimum distance from the mounting hole 22 along the first direction to the flow channel 21 to the dimension of the battery 10 in the first direction is too large (greater than 0.08), the distance between the flow channel 21 and the mounting hole 22 in the first direction will be large. In this case, the arrangement space reserved for the flow channel 21 by the two mounting holes 22 in the first direction will not be fully utilized, resulting in low space utilization.

[0050] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the mounting hole 22 to the flow channel 21 along the first direction to the size of the battery 10 in the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the flow channel 21 by the two mounting holes 22 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchanger 20.

[0051] As one possible implementation, in the first direction, the minimum distance from the mounting hole 22 to the flow channel 21 is D1, in mm, where 5 mm ≤ D1 ≤ 20 mm. For example, D1 can be 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, or 20 mm.

[0052] If the minimum distance from the mounting hole 22 to the flow channel 21 along the first direction is too small, i.e. less than 5 mm, this will result in a smaller allowable error during processing and increased manufacturing difficulty. If the minimum distance from the mounting hole 22 to the flow channel 21 along the first direction is too large, i.e. greater than 20 mm, the arrangement space reserved for the flow channel 21 by the two mounting holes 22 in the first direction will not be fully utilized, resulting in low space utilization.

[0053] According to the battery pack 100 provided by this utility model, the minimum distance from the mounting hole 22 to the flow channel 21 along the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the flow channel 21 by the two mounting holes 22 in the first direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchanger 20.

[0054] Continue to refer to Figure 4 In the first direction, the minimum distance from the mounting hole 22 to the edge of the housing 11 is D2, in mm, and the dimension of the housing 11 is W1, in mm, where 0.02 ≤ D2 / W1 ≤ 0.08. For example, D2 / W1 can be 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.06, 0.07, or 0.08.

[0055] If the ratio of the minimum distance from the mounting hole 22 along the first direction to the edge of the housing 11 to the dimension of the housing 11 in the first direction is too small, i.e., less than 0.02, then the distance between the explosion-proof valve 13 and the outer edge of the bottom end face 12 will be too small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the ratio of the minimum distance from the mounting hole 22 along the first direction to the edge of the housing 11 to the dimension of the housing 11 in the first direction is too large, i.e., greater than 0.08, then the spacing between the two mounting holes 22 along the first direction will be small, which will compress the arrangement space of the flow channel 21, thereby reducing the contact area between the flow channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0056] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the mounting hole 22 to the edge of the housing 11 along the first direction to the size of the housing 11 in the first direction is limited to the above-mentioned numerical range. This not only allows sufficient space for the flow channel 21 in the first direction, but also reduces the mechanical strength of the edge area of ​​the housing 11.

[0057] As one possible implementation, in the first direction, the minimum distance from the mounting hole 22 to the edge of the housing 11 is D2, in mm, where 5 mm ≤ D2 ≤ 20 mm. For example, D2 can be 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, or 20 mm.

[0058] If the minimum distance from the mounting hole 22 along the first direction to the edge of the housing 11 is too small, i.e. less than 5 mm, it will weaken the mechanical strength of the edge area of ​​the housing 11. If the minimum distance from the mounting hole 22 along the first direction to the edge of the housing 11 is too large, i.e. greater than 20 mm, the spacing between the two mounting holes 22 along the first direction will be small, which will compress the arrangement space of the flow channel 21, thereby reducing the contact area between the flow channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchanger 20.

[0059] According to the battery pack 100 provided by this utility model, the minimum distance of the mounting hole 22 along the first direction to the edge of the bottom surface 12 is limited to the above-mentioned numerical range, which can ensure that sufficient arrangement space is reserved for the flow channel 21 in the first direction, and can also reduce the mechanical strength of the edge area of ​​the housing 11.

[0060] refer to Figure 4 In the second direction, the minimum distance from the mounting hole 22 to the edge of the housing 11 is D3, in mm, and the dimension of the housing 11 is W2, in mm, where 0.2 ≤ D3 / W2 ≤ 0.3. For example, D3 / W2 can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, or 0.3.

[0061] If the ratio of the minimum distance from the mounting hole 22 along the second direction to the edge of the housing 11 to the dimension of the housing 11 in the second direction is too small (less than 0.2), the distance from the bottom end face 12 near the outer edge of the explosion-proof valve 13 will be too small, which will weaken the mechanical strength of the edge area of ​​the housing 11. If the ratio of the minimum distance from the mounting hole 22 along the second direction to the edge of the housing 11 to the dimension of the housing 11 in the second direction is too large (greater than 0.3), the dimension of the mounting hole 22 in the second direction will be small, resulting in a smaller area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 will be insufficient, and it will be unable to release the internal pressure or temperature in time, which may easily cause the battery 10 to deform or even explode, thus posing a serious safety hazard.

[0062] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the mounting hole 22 to the edge of the housing 11 along the second direction to the size of the housing 11 in the second direction is limited to the above-mentioned numerical range. This ensures that the two mounting holes 22 have sufficient area to guarantee the pressure relief capability of the explosion-proof valve 13, while also minimizing the weakening of the mechanical strength of the edge area of ​​the housing 11.

[0063] In one implementation, the dimension of the housing 11 in the second direction is W2, in mm, where 25mm ≤ W2 ≤ 60mm. For example, W2 can be 25mm, 28mm, 32mm, 35mm, 38mm, 42mm, 45mm, 48mm, 52mm, or 60mm.

[0064] If the size of the housing 11 in the second direction is too small, i.e., less than 25mm, this will result in an insufficient area for the explosion-proof valve 13. Consequently, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 will be insufficient, failing to release the internal pressure or temperature in time. This could easily lead to deformation or even explosion of the battery 10, posing a serious safety hazard. If the size of the housing 11 in the second direction is too large, i.e., greater than 60mm, it will hinder the heat dissipation of the battery 10. Specifically, the central area of ​​the battery 10 in the second direction will be farther from the heat dissipation surface, making it easier for heat to accumulate and increasing the risk of localized overheating of the battery pack 100.

[0065] According to the battery pack 100 provided by this utility model, the size of the housing 11 in the second direction is limited to the above-mentioned numerical range, which can ensure the area of ​​the explosion-proof valve 13, thereby ensuring the pressure relief capacity of the explosion-proof valve 13, and reduce the risk of local overheating of the battery pack 100.

[0066] Continue to refer to Figure 4 In the second direction, the minimum distance from the mounting hole 22 to the edge of the housing 11 is D3, in mm, where 5mm ≤ D3 ≤ 20mm. For example, D3 can be 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm or 20mm.

[0067] If the minimum distance from the mounting hole 22 along the second direction to the edge of the housing 11 is too small, i.e., less than 5 mm, this will weaken the mechanical strength of the edge area of ​​the housing 11. If the minimum distance from the mounting hole 22 along the second direction to the edge of the housing 11 is too large, i.e., greater than 20 mm, then the size of the mounting hole 22 in the second direction is small, resulting in a small area of ​​the explosion-proof valve 13. As a result, when the internal pressure or temperature of the battery 10 rises to a predetermined threshold, the pressure relief capacity of the explosion-proof valve 13 is insufficient, and it cannot release the internal pressure or temperature in time, which can easily cause the battery 10 to deform or even explode, thus posing a serious safety hazard.

[0068] According to the battery pack 100 provided by this utility model, the minimum distance from the mounting hole 22 to the edge of the housing 11 along the second direction is limited to the above-mentioned numerical range. This ensures that the two mounting holes 22 have sufficient area to guarantee the pressure relief capability of the explosion-proof valve 13, while also minimizing the weakening of the mechanical strength of the edge area of ​​the housing 11.

[0069] refer to Figure 6The flow channel 21 includes a first plate portion 231 and a second plate portion 232 spaced apart in the vertical direction. The first plate portion 231 is closer to the bottom end face 12 than the second plate portion 232. The second plate portion 232 includes a plurality of recesses 24 that protrude from the second plate portion 232 toward the first plate portion 231. According to the battery pack 100 provided by the present invention, by constructing a plurality of recesses 24 on the second plate portion 232, the structural stability of the entire flow channel 21 can be enhanced, thereby improving the mechanical strength and compressive strength of the heat exchange element 20 and preventing the flow channel 21 from deforming due to pressure.

[0070] refer to Figure 4 and Figure 5 The plurality of recesses 24 include a first recess 241 and a second recess 242 extending along a second direction, the first recess 241 and the second recess 242 being spaced apart along a first direction. The extending directions of the first recess 241 and the second recess 242 are parallel to the flow direction of the heat exchange medium in the flow channel 21, which can reduce the interference of the recesses 24 on the flow of the heat exchange medium.

[0071] Continue to refer to Figure 4 and Figure 5 The flow channel 21 is divided into a first sub-flow channel 211, a second sub-flow channel 212, and a third sub-flow channel 213 along the first direction by a first recess 241 and a second recess 242. Compared with the undivided flow channel 21, the dimensions of the divided first sub-flow channel 211, second sub-flow channel 212, and third sub-flow channel 213 are all reduced in the first direction, thereby increasing the flow velocity of the fluid medium in the first sub-flow channel 211, second sub-flow channel 212, and third sub-flow channel 213, thereby improving the heat exchange efficiency of the heat exchanger 20.

[0072] Continue to refer to Figure 4 and Figure 5 In the first direction, the size of the first sub-channel 211 is L1 in mm, and the size of the second sub-channel 212 is L2 in mm, where L2 ≥ L1.

[0073] If the dimension of the second sub-channel 212 in the first direction is smaller than the dimension of the first sub-channel 211 in the first direction, the flow resistance of the second sub-channel 212 will be larger. This may cause the heat exchange medium to bypass the second sub-channel 212 and preferentially flow to the first sub-channel 211 when flowing in the channel 21, thereby reducing the contact area between the channel 21 and the bottom end face 12 of the battery 10 and affecting the heat exchange effect. The battery pack 100 provided by this utility model ensures that the heat exchange medium passes through the second sub-channel 212 when flowing in the channel 21 by setting the dimension of the second sub-channel 212 in the first direction to be greater than or equal to the dimension of the first sub-channel 211 in the first direction, thereby ensuring the heat exchange area of ​​the channel 21.

[0074] Continue to refer to Figure 4 and Figure 5In the first direction, the size of the first sub-channel 211 is L1 in mm, and the size of the second sub-channel 212 is L2 in mm, where 1 ≤ L2 / L1 ≤ 2. For example, L2 / L1 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 or 2.

[0075] If the ratio of the dimension of the second sub-channel 212 in the first direction to the dimension of the first sub-channel 211 in the first direction is too small, i.e., less than 1, this may cause the heat exchange medium to bypass the second sub-channel 212 and preferentially flow to the first sub-channel 211 when flowing in the channel 21, thereby reducing the contact area between the channel 21 and the bottom end face 12 of the battery 10 and affecting the heat exchange effect. If the ratio of the dimension of the second sub-channel 212 in the first direction to the dimension of the first sub-channel 211 in the first direction is too large, i.e., greater than 2, then the dimension of the first sub-channel 211 in the first direction is small, which will increase the flow resistance of the first sub-channel 211, thereby reducing the flow rate of the heat exchange medium through the first sub-channel 211 when flowing in the channel 21.

[0076] The battery pack 100 provided by this utility model limits the ratio of the size of the second sub-channel 212 in the first direction to the size of the first sub-channel 211 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the first sub-channel 211 and the second sub-channel 212 when it flows in the channel 21, thus ensuring the heat exchange effect.

[0077] Continue to refer to Figure 4 and Figure 5 In the first direction, the size of the second sub-channel 212 is L2 in mm, and the size of the third sub-channel 213 is L3 in mm, where L2 ≥ L3.

[0078] If the dimension of the second sub-channel 212 in the first direction is smaller than the dimension of the third sub-channel 213 in the first direction, the flow resistance of the second sub-channel 212 will be larger. This may cause the heat exchange medium to bypass the second sub-channel 212 and preferentially flow to the third sub-channel 213 when flowing in the channel 21, thereby reducing the contact area between the channel 21 and the bottom end face 12 of the battery 10 and affecting the heat exchange effect. The battery pack 100 provided by this utility model, by setting the dimension of the second sub-channel 212 in the first direction to be greater than or equal to the dimension of the third sub-channel 213 in the first direction, can ensure that the heat exchange medium flows through the second sub-channel 212 when flowing in the channel 21, thereby ensuring the effective heat exchange area of ​​the channel 21.

[0079] refer to Figure 4 and Figure 5In the first direction, the size of the second sub-channel 212 is L2 in mm, and the size of the third sub-channel 213 is L3 in mm, where 1 ≤ L2 / L3 ≤ 2. For example, L2 / L3 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 2.

[0080] If the ratio of the dimension of the second sub-channel 212 to the dimension of the third sub-channel 213 in the first direction is too small (less than 1), the heat exchange medium may bypass the second sub-channel 212 and preferentially flow to the third sub-channel 213 when flowing in the channel 21. This will reduce the contact area between the channel 21 and the bottom end face 12 of the battery 10, thus affecting the heat exchange effect. If the ratio of the dimension of the second sub-channel 212 to the dimension of the third sub-channel 213 in the first direction is too large (greater than 2), the dimension of the third sub-channel 213 in the first direction will be small. This will increase the flow resistance of the third sub-channel 213, thereby reducing the flow rate of the heat exchange medium through the third sub-channel 213 when flowing in the channel 21.

[0081] The battery pack 100 provided by this utility model limits the ratio of the size of the second sub-channel 212 in the first direction to the size of the third sub-channel 213 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the third sub-channel 213 and the second sub-channel 212 when it flows in the channel 21, thereby ensuring the heat exchange effect.

[0082] As one possible implementation, the orthographic projection area of ​​the multiple recesses 24 along the vertical direction is A1, in mm. 2 The projected area of ​​flow channel 21 along the vertical direction is A2, in mm. 2 0.1≤A1 / A2≤0.3. For example, A1 / A2 can be 0.1, 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, 0.24, 0.26 or 0.3.

[0083] If the ratio of the projected area of ​​the multiple recesses 24 along the vertical direction to the projected area of ​​the flow channel 21 along the vertical direction is too small, i.e., less than 0.1, the structural stability of the flow channel 21 is poor, and the flow channel 21 is easily deformed under pressure. If the ratio of the projected area of ​​the multiple recesses 24 along the vertical direction to the projected area of ​​the flow channel 21 along the vertical direction is too large, i.e., greater than 0.3, the heat exchange area between the heat exchange medium and the bottom end surface 12 of the battery 10 is small, which will lead to poor heat exchange effect.

[0084] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the plurality of recesses 24 in the vertical direction to the projected area of ​​the flow channel 21 in the vertical direction is limited to the above-mentioned numerical range, which can ensure the structural stability of the heat exchanger 20 and the contact area between the heat exchange medium and the bottom end surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchanger 20.

[0085] As one possible implementation, the projected area of ​​the flow channel 21 along the vertical direction is A2, in mm. 2 450mm 2 ≤A2≤1500mm 2 For example, A2 can be 450mm. 2 500 mm 2 550 mm 2 600 mm 2 700 mm 2 800 mm 2 900 mm 2 1000 mm 2 1200 mm 2 Or 1500 mm 2 .

[0086] If the projected area of ​​the flow channel 21 in the vertical direction is too small, i.e. less than 450 mm 2 If the heat exchange area between the heat exchange medium and the bottom surface 12 of the battery 10 is small, the heat exchange effect will be poor. If the projected area of ​​the flow channel 21 along the vertical direction is too large, i.e. greater than 1500 mm... 2 This would compress the installation space of the explosion-proof valve 13.

[0087] According to the battery pack 100 provided by this utility model, the projected area of ​​the flow channel 21 in the vertical direction is limited to the above-mentioned numerical range, which can ensure the contact area between the heat exchange medium and the bottom end face 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the explosion-proof valve 13.

[0088] As one possible implementation, the projected area of ​​the flow channel 21 along the vertical direction is A2, in mm. 2 The projected area of ​​multiple batteries 10 along the vertical direction is A3, in mm. 2 0.6 ≤ A2 / A3 ≤ 0.8. For example, A2 / A3 can be 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76 or 0.8.

[0089] If the ratio of the projected area of ​​the flow channel 21 in the vertical direction to the projected area of ​​the multiple batteries 10 in the vertical direction is too small, i.e. less 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 effect. If the ratio of the projected area of ​​the flow channel 21 in the vertical direction to the projected area of ​​the multiple batteries 10 in the vertical direction is too large, i.e. greater than 0.8, the area of ​​the mounting hole 22 is small, resulting in limited installation space for the explosion-proof valve 13.

[0090] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the flow channel 21 in the vertical direction to the projected area of ​​the multiple 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 bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and can also reserve sufficient installation space for the explosion-proof valve 13.

[0091] refer to Figure 2 The plurality of batteries 10 includes two rows of batteries 10 spaced apart along a first direction. In the first direction, the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 is D4 (in mm). The size of the battery 10 is W1 (in mm), and 0.06 ≤ D4 / W1 ≤ 0.12. For example, D4 / W1 can be 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.090, 0.095, 0.1, or 0.12.

[0092] If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too small, i.e., less than 0.06, then after the explosion-proof valve 13 of one battery 10 is actuated, the gas released from the housing 11 may impact the explosion-proof valve 13 of the other battery 10, causing it to be actuated unexpectedly. If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too large, i.e., greater than 0.12, then the arrangement space of the flow channel 21 in the first direction will be compressed, thereby reducing the contact area between the flow channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchanger 20.

[0093] The battery pack 100 provided by this utility model limits the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the size of the battery 10 in the first direction to the above-mentioned numerical range. This can ensure the arrangement space of the flow channel 21 in the first direction and effectively reduce the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when one of them bursts, thereby improving the safety of the battery pack 100.

[0094] refer to Figure 2In the first direction, the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 is D4, in mm, where 15mm ≤ D4 ≤ 40mm. For example, D4 ​​can be 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm or 40mm.

[0095] If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too small, i.e., less than 15 mm, the gas released from the housing 11 after the explosion-proof valve 13 of one battery 10 is activated may impact the explosion-proof valve 13 of the other battery 10, causing it to be activated unexpectedly. If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too large, i.e., greater than 40 mm, it will compress the arrangement space of the flow channel 21 in the first direction, thereby reducing the contact area between the flow channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0096] The battery pack 100 provided by this utility model limits the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the above-mentioned numerical range. This not only ensures the arrangement space of the flow channel 21 in the first direction, but also effectively reduces the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when it bursts, thereby improving the safety of the battery pack 100.

[0097] <Example Electrical Equipment> refer to Figure 7 This utility model provides an electrical device 200, which includes a battery pack 100.

[0098] 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.

[0099] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0100] In a non-restrictive example, refer to Figure 7 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0101] 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".

[0102] It should be understood that although terms such as "first" or "second" may be used in this disclosure to describe various elements (such as the first plate portion and the second plate portion), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0103] 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) including a housing (11), the bottom end face (12) of the housing (11) being provided with two explosion-proof valves (13), the two explosion-proof valves (13) being spaced apart in a first direction, the multiple batteries (10) being arranged along a second direction; and The heat exchanger (20) includes a flow channel (21) and a plurality of mounting holes (22), the plurality of mounting holes (22) receiving explosion-proof valves (13) of the plurality of batteries (10), the flow channel (21) extending along a second direction and located between two of the plurality of mounting holes (22), the extension direction of the two mounting holes (22) forming an angle with the second direction, and the vertical direction, the first direction and the second direction being perpendicular to each other.

2. The battery pack (100) according to claim 1, characterized in that, The bottom end face (12) includes two first edges (121) spaced apart along a first direction. The angle between the mounting hole (22) and the first edge (121) adjacent to the mounting hole (22) is B, in °, where 15°≤B≤60°.

3. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the mounting hole (22) to the flow channel (21) is D1 in mm, and the size of the housing (11) is W1 in mm, 0.02≤D1 / W1≤0.

08.

4. The battery pack (100) according to claim 3, characterized in that, In the first direction, the minimum distance from the mounting hole (22) to the flow channel (21) is D1, in mm, where 5mm≤D1≤20mm.

5. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the mounting hole (22) to the edge of the housing (11) is D2 in mm, and the size of the housing (11) is W1 in mm, 0.02≤D2 / W1≤0.

08.

6. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the mounting hole (22) to the edge of the housing (11) is D2, in mm, where 5mm≤D2≤20mm.

7. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the mounting hole (22) to the edge of the housing (11) is D3 in mm, and the size of the housing (11) is W2 in mm, 0.2≤D3 / W2≤0.

3.

8. The battery pack (100) according to claim 7, characterized in that, In the second direction, the size of the housing (11) is W2 in mm, where 25 mm ≤ W2 ≤ 60 mm.

9. The battery pack (100) according to claim 7, characterized in that, In the second direction, the minimum distance from the mounting hole (22) to the edge of the housing (11) is D3, in mm, where 5mm≤D3≤20mm.

10. The battery pack (100) according to claim 1, characterized in that, The flow channel (21) includes a first plate portion (231) and a second plate portion (232) spaced apart in the vertical direction. The first plate portion (231) is closer to the bottom end face (12) than the second plate portion (232). The second plate portion (232) includes a plurality of recesses (24) that protrude from the second plate portion (232) toward the first plate portion (231).

11. The battery pack (100) according to claim 10, characterized in that, The plurality of recesses (24) include a first recess (241) and a second recess (242) extending along the second direction, the first recess (241) and the second recess (242) being spaced apart along the first direction.

12. The battery pack (100) according to claim 11, characterized in that, The flow channel (21) is divided into a first sub-flow channel (211), a second sub-flow channel (212) and a third sub-flow channel (213) along the first direction by the first recess (241) and the second recess (242). In the first direction, the size of the first sub-flow channel (211) is L1 in mm, the size of the second sub-flow channel (212) is L2 in mm, and the size of the third sub-flow channel (213) is L3 in mm, where L2 ≥ L1 and L2 ≥ L3.

13. The battery pack (100) according to claim 12, characterized in that, In the first direction, the size of the first sub-channel (211) is L1 in mm, and the size of the second sub-channel (212) is L2 in mm, where 1 ≤ L2 / L1 ≤ 2.

14. The battery pack (100) according to claim 12, characterized in that, In the first direction, the size of the second sub-channel (212) is L2 in mm, and the size of the third sub-channel (213) is L3 in mm, where 1 ≤ L2 / L3 ≤ 2.

15. The battery pack (100) according to claim 10, characterized in that, The projected area of ​​the plurality of recesses (24) along the vertical direction is A1, in mm. 2 The projected area of ​​the flow channel (21) along the vertical direction is A2, in mm. 2 , 0.1≤A1 / A2≤0.

3.

16. The battery pack (100) according to claim 15, characterized in that, The projected area of ​​the flow channel (21) along the vertical direction is A2, in mm. 2 450mm 2 ≤A2≤1500mm 2 .

17. The battery pack (100) according to claim 1, characterized in that, The projected area of ​​the flow channel (21) along the vertical direction is A2, in mm. 2 The projected area of ​​the plurality of batteries (10) along the vertical direction is A3, in mm. 2 , 0.6≤A2 / A3≤0.

8.

18. The battery pack (100) according to claim 1, characterized in that, The plurality of batteries (10) includes two rows of batteries (10) spaced apart along the first direction. In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4 in mm. The size of the housing (11) is W1 in mm, and 0.06≤D4 / W1≤0.

12.

19. The battery pack (100) according to claim 18, characterized in that, In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4, in mm, where 15mm≤D4≤40mm.

20. An electrical appliance (200), characterized in that, The battery pack (100) includes any one of claims 1 to 19.

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