Battery pack and electric device with same

Abstract

The utility model relates to battery pack and electric equipment with it, and the battery includes the casing, and the bottom end surface of casing is equipped with the explosion -proof valve, and the bottom end surface includes two first edges in the first direction interval and two second edges in the second direction interval, and the size of first edge is less than the size of second edge, and the first direction, second direction and up and down direction are perpendicular pairwise. The heat exchange spare includes multiple heat exchange runner and multiple avoidance hole, and multiple heat exchange runner extends along the first direction, and multiple avoidance hole is spaced along the second direction and receives the explosion -proof valve in multiple batteries. The battery pack includes multiple pairs of batteries along the second direction arrangement, and at least a part of heat exchange runner is located between two avoidance holes of at least one pair of batteries, and in the first direction, the distance of avoidance hole to two first edges of the bottom end surface of corresponding battery is different and two avoidance holes are spaced in the first direction, thereby can provide greater arrangement space for heat exchange runner, and ensure the heat exchange effect of heat exchange spare.

Description

Technical Field

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

[0002] Battery packs are core components in systems such as electric vehicles and energy storage devices, and their safety and reliability are of paramount importance. During actual operation, batteries generate a significant amount of heat when charging and discharging. If heat dissipation is inadequate or uneven, localized overheating can easily occur, potentially leading to thermal runaway. To mitigate this risk, some battery packs are equipped with heat exchange components that conduct and dissipate heat through contact with the battery, thereby preventing safety issues caused by excessively high localized temperatures.

[0003] Battery casings are typically equipped with explosion-proof valves to release gas promptly when internal pressure becomes too high. However, the presence of these valves restricts the arrangement of heat exchange channels in heat exchange components, resulting in a reduced channel cross-sectional area. This, in turn, decreases the flow efficiency of the heat exchange medium and affects the overall heat dissipation performance. Utility Model Content

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

[0005] The battery pack provided by this utility model includes multiple batteries and a heat exchanger. Each battery includes a housing with an explosion-proof valve on its bottom surface. The bottom surface includes two first edges spaced apart in a first direction and two second edges spaced apart in a second direction. The dimensions of the first edges are smaller than the dimensions of the second edges, and the first, second, and vertical directions are mutually perpendicular. The heat exchanger includes multiple heat exchange channels and multiple clearance holes. The heat exchange channels extend along the first direction, and the clearance holes are spaced apart along the second direction and receive the explosion-proof valves of the multiple batteries. The battery pack includes multiple pairs of batteries arranged along the second direction. At least a portion of the heat exchange channels is located between two clearance holes of at least one pair of batteries. In the first direction, the distances from the clearance holes to the two first edges of the bottom surface of the corresponding battery are different, and the two clearance holes are spaced apart in the first direction.

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

[0007] Compared to the heat exchange channel passing through two overlapping clearance holes in the second direction, the arrangement of the two clearance holes spaced apart in the first direction provides more arrangement space for the heat exchange channel. Furthermore, the distances from the clearance holes to the two first edges of the bottom surface of the corresponding battery are different, which allows for a further increase in the spacing between the two clearance holes, thereby increasing the arrangement space for the heat exchange channel. This helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the overall heat exchange effect of the heat exchange component.

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

[0021] Reference numerals: Battery pack-100; Battery-10; Housing-11; Bottom surface-12; First edge-121; Second edge-122; Explosion-proof valve-13; Heat exchanger-20; Heat exchange channel-21; Clearance hole-22; Straight section-23; Bending section-24; Inlet section-25; First extension-251; Outlet section-26; Second extension-252; Inlet-27; Outlet-28; Electrical equipment-200. Detailed Implementation

[0022] 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.

[0023] <Example Battery>

[0024] Figure 4 A battery 10 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery, the active materials can be activated by charging after discharge so that it can continue to be used.

[0025] The battery 10 includes a housing 11 and battery cells (not shown) disposed within the housing 11.

[0026] The housing 11 is a component used to provide a receiving space to house the battery cell and other components and isolate them from the outside environment. The housing 11 generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing 11 can be closed by a cover plate to seal and isolate the internal environment of the battery 10 from the external environment.

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

[0028] 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.

[0029] It is understandable that battery cells can be implemented in various ways. For example, a battery cell can be formed by winding a positive electrode, a separator, and a negative electrode to form a cylindrical battery cell. Another example is that a battery cell can be formed by winding or stacking a positive electrode, a separator, and a negative electrode to form a battery cell with a roughly rectangular shape.

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

[0031] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- can be used to indicate opposite sides in the up and down direction; arrows X+ and X- can be used to indicate opposite sides in the first direction; arrows Y+ and Y- can be used to indicate opposite sides in the second direction, and the first direction, the second direction, and the up and down direction are perpendicular to each other.

[0032] Continue to refer to Figure 4 An 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.

[0033] 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.

[0034] It is understood that the present invention does not impose any particular restrictions on the shape of the explosion-proof valve 13. For example, the shape of the explosion-proof valve 13 can be one of square, oblong, elliptical and racetrack shape.

[0035] It is understood that this utility model does not impose any special restrictions on the type of explosion-proof valve 13. For example, the explosion-proof valve 13 can be a grooved explosion-proof valve, or it can be formed by stamping or laser etching.

[0036] <Example Battery Pack>

[0037] refer to Figure 1 and Figure 2A battery pack 100 is shown. Exemplarily, the battery pack 100 serves as a power source for new energy vehicles, acting as a rechargeable battery. The battery pack 100 includes a battery group composed of multiple batteries 10 connected in series and / or parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. Exemplarily, the casing can be divided into upper and lower parts, which are sealed together.

[0038] In some embodiments, the battery pack 100 further includes an isolation plate. Both the battery pack and the isolation plate are located in the housing. The isolation plate is located on the side of the battery pack away from the bottom wall of the housing, separating the battery pack from other devices located above the battery pack, thus serving as an isolation device.

[0039] Battery 10 faces different performance and safety challenges under different temperature environments. For example, at low temperatures, the electrochemical reaction rate inside Battery 10 decreases significantly, which can easily lead to capacity decay, increased internal resistance, and reduced power output, and in severe cases, even failure to function properly. At high temperatures or during intense charging and discharging, Battery 10 generates a large amount of heat. If heat dissipation is not timely or uneven, it may cause local overheating, leading to safety hazards such as thermal runaway.

[0040] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 3 The battery pack 100 also includes a heat exchanger 20, which is used to dissipate heat from the battery 10 to regulate the temperature of the battery 10.

[0041] As one possible implementation, the heat exchanger 20 can be a cold plate 20, which can be constructed as a liquid-cooled plate or a phase-change cold plate, and is thermally connected to the battery 10. A refrigerant can be stored inside the cold plate 20, and cooling of the battery 10 is achieved through the phase change of the refrigerant.

[0042] It is understandable that the refrigerant can be gas, solid, or liquid. Liquid refrigerants can also contain liquids with high specific heat capacity, such as water, as coolants to achieve liquid cooling of the battery 10.

[0043] As an example, the heat exchanger 20 can be an air-cooled plate, located at the bottom of the housing, i.e., connected to the bottom of the side wall to form a sealed housing structure. The air-cooled plate can be fixed to the side wall of the housing using nuts or other methods. In order to form an airflow cavity inside the housing, the bottom plate is set inside the barrel-shaped structure. Since the bottom of the battery is flat, the bottom plate also needs to be set parallel to the air-cooled plate, with a gap between the air-cooled plate and the bottom plate, so that the bottom plate, side wall, and air-cooled plate together form an airflow cavity.

[0044] As another example, the heat exchanger 20 can be a liquid-cooled plate 20, which has liquid-cooled channels within it. Optionally, the liquid-cooled plate also includes an inlet and an outlet, both of which are connected to a current collector for the inlet and outlet of the heat exchange medium. The liquid-cooled plate 20 can be made of a material with a certain hardness and strength (such as stainless steel), so that the liquid-cooled plate 20 is not easily deformed when the battery cell is subjected to compression or impact, which can enable the battery cell to have higher structural strength and improve safety performance.

[0045] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped.

[0046] 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.

[0047] In the current embodiment, reference is made to Figure 3 and Figure 4 The heat exchanger 20 and the explosion-proof valve 13 are located on the lower side of the housing 11. The heat exchanger 20 includes a plurality of heat exchange channels 21 and a plurality of clearance holes 22. The plurality of heat exchange channels 21 extend along a first direction, and the plurality of clearance holes 22 are spaced along a second direction and receive the explosion-proof valve 13 of the plurality of batteries 10.

[0048] refer to Figure 1 , Figure 3 and Figure 5 The battery pack 100 includes multiple pairs of batteries 10 arranged along a second direction. At least a portion of the heat exchange channel 21 is located between two clearance holes 22 of a pair of batteries. The boundary of a pair of batteries 10 is shown in the figure as a dashed line. In the first direction, the clearance holes 22 are at different distances from the two first edges 121 of the bottom end face 12 of the corresponding battery 10, and the two clearance holes 22 are spaced apart in the first direction.

[0049] Compared to the two overlapping clearance holes 22 projected in the second direction, the two clearance holes 22 are spaced apart in the first direction, providing more arrangement space for the heat exchange channel 21. Furthermore, the clearance holes 22 are at different distances from the two first edges 121 of the bottom surface 12 of the corresponding battery 10. This allows for a further increase in the spacing between the two clearance holes 22, thereby increasing the arrangement space for the heat exchange channel 21. This helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the overall heat exchange effect of the heat exchange component 20.

[0050] As one possible implementation, refer to Figure 5In the first direction, the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 is L1 mm, and the distance from the avoidance hole 22 to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 is L2 mm, where L1 mm < L2 mm and 0.066 ≤ L1 mm / L2 mm < 1. For example, L1 mm / L2 mm can be 0.066, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 0.98.

[0051] If the ratio of the distance from the avoidance hole 22 along the first direction to one first edge 121 of the bottom end surface 12 of the corresponding battery 10 to the distance from the avoidance hole 22 along the first direction to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 is too small, that is, less than 0.066, the distance from the avoidance hole 22 to the outer first edge 121 is too small, so the distance from the explosion-proof valve 13 to the first edge 121 of the bottom end surface 12 of the housing 11 is also too small, which will weaken the mechanical strength of the edge region of the housing 11. As a result, the edge region of the housing 11 is prone to deformation under adverse working conditions such as vibration. If the aforementioned ratio is too large, that is, greater than or equal to 1, the spacing between the two avoidance holes 22 in the first direction is small, thereby limiting the arrangement space of the heat exchange flow channels 21.

[0052] According to the battery pack 100 provided by the present utility model, limiting the ratio of the distance from the avoidance hole 22 along the first direction to one first edge 121 of the bottom end surface 12 of the corresponding battery 10 to the distance from the avoidance hole 22 along the first direction to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 within the above numerical range can not only ensure the arrangement space of the heat exchange flow channels 21 in the first direction, but also reduce the reduction of the mechanical strength of the edge region of the housing 11.

[0053] As a possible implementation, in the first direction, the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 is L1 mm, and 10mm ≤ L1 mm ≤ 50mm. For example, L1 mm can be 10mm, 15mm, 18mm, 22mm, 27mm, 33mm, 40mm, 50mm.

[0054] If the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction is too small, that is, less than 10 mm, the distance from the explosion-proof valve 13 to the first edge 121 of the bottom end surface 12 of the casing 11 will be too small, which will weaken the mechanical strength of the edge region of the casing 11. As a result, the edge region of the casing 11 is prone to deformation under adverse working conditions such as vibration. If the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction is too large, that is, greater than 50 mm, the spacing between two avoidance holes 22 in the first direction will be relatively small, thereby limiting the arrangement space of the heat exchange flow channel 21.

[0055] According to the battery pack 100 provided by the present utility model, limiting the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction within the above numerical range can not only ensure the arrangement space of the heat exchange flow channel 21 in the first direction, but also reduce the reduction of the mechanical strength of the edge region of the casing 11.

[0056] Further, in the first direction, the distance from the avoidance hole 22 to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 is L2 mm, and 50mm < L2 mm ≤ 150mm. For example, L2 mm can be 50mm, 60mm, 70mm, 85mm, 95mm, 110mm, 130mm, 150mm.

[0057] If the distance from the avoidance hole 22 to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction is too small, that is, less than or equal to 50 mm, the distance from the explosion-proof valve 13 to a first edge 121 of the bottom end surface 12 of the casing 11 will also be too small, which will weaken the mechanical strength of the edge region of the casing 11. As a result, the edge region of the casing 11 is prone to deformation under adverse working conditions such as vibration. If the distance from the avoidance hole 22 to the other first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction is too large, that is, greater than 150 mm, the spacing between two avoidance holes 22 in the first direction will be relatively small, thereby limiting the arrangement space of the heat exchange flow channel 21.

[0058] According to the battery pack 100 provided by the present utility model, limiting the distance from the avoidance hole 22 to a first edge 121 of the bottom end surface 12 of the corresponding battery 10 in the first direction within the above numerical range can not only ensure the arrangement space of the heat exchange flow channel 21 in the first direction, but also reduce the reduction of the mechanical strength of the edge region of the casing 11.

[0059] As a possible implementation, refer to Figure 5In the first direction, the size of the battery 10 is L3 mm, and the minimum distance between the two clearance holes 22 is L4 mm, where 0.05 ≤ L4 mm / L3 mm ≤ 0.2. For example, L4 mm / L3 mm can be 0.05, 0.1, 0.12, 0.14, 0.16, 0.18 or 0.2.

[0060] If the ratio of the minimum distance between the two clearance holes 22 in the first direction to the dimension of the battery 10 in the first direction is too small, i.e., less than 0.05, the arrangement space for the heat exchange channel 21 in the first direction will be small. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchanger 20. If the ratio of the minimum distance between the two clearance holes 22 in the first direction to the dimension of the battery 10 in the first direction is too large, i.e., greater than 0.2, it will restrict the installation space of the explosion-proof valve 13 in the first direction.

[0061] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance between the two clearance holes 22 in the first direction to the size of the battery 10 in the first direction is limited to the above-mentioned numerical range, which can ensure the arrangement space of the heat exchange channel 21 in the first direction and reserve sufficient installation space for the explosion-proof valve 13.

[0062] As one possible implementation, the minimum distance between the two clearance holes 22 in the first direction is L4 mm, where 10 mm ≤ L4 mm ≤ 30 mm. For example, L4 mm can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 25 mm, or 30 mm.

[0063] If the minimum distance between the two clearance holes 22 in the first direction is too small, i.e. less than 10 mm, the arrangement space for the heat exchange channel 21 in the first direction will be small. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchanger 20. If the minimum distance between the two clearance holes 22 in the first direction is too large, i.e. greater than 30 mm, it will restrict the installation space of the explosion-proof valve 13 in the first direction.

[0064] According to the battery pack 100 provided by this utility model, the minimum distance between the two clearance holes 22 in the first direction is limited to the above-mentioned numerical range, which can ensure the arrangement space of the heat exchange channel 21 in the first direction and reserve sufficient installation space for the explosion-proof valve 13.

[0065] As one possible implementation, the minimum distance between the two clearance holes 22 of each pair of batteries 10 located on both sides of the plurality of batteries 10 in the second direction is L41 mm, and the minimum distance between the two clearance holes 22 of a pair of batteries located at the middle position of the plurality of batteries 10 in the second direction is L42 mm and L41 mm. <L42 mm。

[0066] Compared to the batteries 10 located on either side of the second direction, the battery 10 in the middle position is more significantly affected by heat accumulation. In the battery pack 100 provided by this utility model, the distance between the two clearance holes 22 of each pair of batteries 10 located on either side of the second direction is smaller than the distance between the two clearance holes 22 of the pair of batteries in the middle position. This implementation can increase the size of the heat exchange channel 21 corresponding to the battery 10 in the middle position, thereby increasing the contact area between the heat exchange channel 21 and the bottom end surface 12 of the battery 10, which helps to improve heat exchange efficiency, contributes to the uniformity of temperature distribution within the battery pack 100, and avoids local overheating.

[0067] It should be noted that the above implementation method only applies to the batteries 10 located on both sides of the second direction and the battery located in the middle position. In some embodiments, the minimum distance between the two clearance holes of the battery pair can be gradually increased along the direction from both sides of the second direction to the middle position.

[0068] refer to Figure 5 and Figure 6 The heat exchange channel 21 includes two straight sections 23 and a bent section 24. The projection of the clearance hole 22 along the second direction overlaps with the projection of the straight section 23 along the second direction. The bent section 24 connects the two straight sections 23 and is located between the two clearance holes 22. Since the projection of the clearance hole 22 along the second direction overlaps with the projection of the straight section 23 along the second direction, and the two clearance holes 22 are spaced apart in the first direction, the straight section 23 is spaced apart from one clearance hole 22 in the second direction and from the other clearance hole 22 in the first direction. Therefore, the straight section 23 can achieve a larger size in the second direction. The bent section 24 is located between the two clearance holes 22, and the two clearance holes 22 are spaced apart in the first direction. Therefore, in the second direction, the two clearance holes 22 do not interfere with the arrangement of the bent section 24.

[0069] Further, refer to Figure 5 and Figure 6 In the second direction, the dimension of the straight segment 23 is D1 mm, and the dimension of the first edge 121 is W mm, where 0.25 ≤ D1 mm / W mm ≤ 0.85. For example, D1 mm / W mm can be 0.25, 0.35, 0.45, 0.50, 0.60, 0.70, 0.80, or 0.85.

[0070] If the ratio of the dimension of the straight section 23 in the second direction to the dimension of the first edge 121 in the second direction is too small, i.e., less than 0.25, the contact area between the straight section 23 and the bottom surface 12 of the battery 10 will be small, which will reduce the heat exchange efficiency of the heat exchange element 20. If the ratio of the dimension of the straight section 23 in the second direction to the dimension of the first edge 121 in the second direction is too large, i.e., greater than 0.85, it will restrict the installation space of the explosion-proof valve 13 in the first direction. According to the battery pack 100 provided by this utility model, limiting the ratio of the dimension of the straight section 23 in the second direction to the dimension of the first edge 121 in the second direction to the above-mentioned value range can ensure the heat exchange area between the straight section 23 and the bottom surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20, and can also reserve sufficient installation space for the explosion-proof valve 13.

[0071] As one possible implementation, refer to Figure 6 In the second direction, the dimension of the straight segment 23 is D1mm, where 15mm ≤ D1mm ≤ 50mm. For example, D1mm can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm.

[0072] If the dimension of the straight section 23 in the second direction is too small, i.e., less than 15 mm, the contact area between the straight section 23 and the bottom end face 12 of the battery 10 will be small, which will reduce the heat exchange efficiency of the heat exchange element 20. If the dimension of the straight section 23 in the second direction is too large, i.e., greater than 50 mm, it will restrict the installation space of the explosion-proof valve 13 in the first direction. According to the battery pack 100 provided by this utility model, limiting the dimension of the straight section 23 in the second direction to the above-mentioned numerical range can ensure the heat exchange area between the straight section 23 and the bottom end face 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20, and can also reserve sufficient installation space for the explosion-proof valve 13.

[0073] As one possible implementation, refer to Figure 5 The dimension of the first edge 121 in the second direction is W mm, where 20 mm ≤ W mm ≤ 60 mm.

[0074] If the dimension of the first edge 121 in the second direction is too small, i.e. less than 20 mm, the portion of the heat exchange channel 21 located between the two clearance holes 22 of the pair of batteries 10 will also have a smaller dimension in the second direction. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchange element 20. If the dimension of the first edge 121 in the second direction is too large, i.e. greater than 60 mm, it will be detrimental to the heat dissipation of the battery 10. Specifically, the central region of the battery 10 in the second direction will be farther from the heat dissipation surface, and heat will easily accumulate, thereby increasing the risk of local overheating of the battery pack 100.

[0075] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the clearance hole 22 to the heat exchange channel 21 to the size of the first edge 121 is limited to the above-mentioned numerical range. This ensures that the two clearance holes 22 provide space for the arrangement of the heat exchange channel 21 in the second direction, without increasing the risk of local overheating of the battery pack 100.

[0076] As one possible implementation, refer to Figure 6 The straight section 23 has a dimension of D1 mm in the second direction, and the minimum dimension of the bent section 24 in the cross-section perpendicular to the central axis of the heat exchange channel 21 is D2 mm, where 0.6 ≤ D2 mm / D1 mm ≤ 0.9. For example, D2 mm / D1 mm can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9.

[0077] If the ratio of the minimum dimension of the bent section 24 in the cross-section perpendicular to the central axis of the heat exchange channel 21 to the dimension of the straight section 23 in the second direction is too small (less than 0.6), the flow area of ​​the heat exchange medium will change abruptly as it flows from the straight section 23 to the bent section 24 (or from the bent section 24 to the straight section 23), resulting in uneven flow velocity distribution. If the ratio of the minimum dimension of the bent section 24 in the cross-section perpendicular to the central axis of the heat exchange channel 21 to the dimension of the straight section 23 in the second direction is too large (greater than 0.9), the contact area between the straight section 23 and the bottom end face 12 of the battery 10 will be small, which will reduce the heat exchange efficiency of the heat exchanger 20.

[0078] According to the battery pack 100 provided by this utility model, the ratio of the minimum dimension of the bent section 24 on the cross section perpendicular to the central axis of the heat exchange channel 21 to the dimension of the straight section 23 is limited to the above-mentioned numerical range. This ensures that the abrupt change in the flow area of ​​the heat exchange medium in the flow path is reduced, so that the heat exchange medium can flow smoothly, and also ensures the heat exchange area between the straight section 23 and the bottom end face 12 of the battery 10, thereby ensuring the heat exchange effect.

[0079] As one possible implementation, refer to Figure 5 and Figure 6 The minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 is D2 mm, and the minimum distance between the two clearance holes 22 is D3 mm, where 0.2 ≤ D2 mm / D3 mm ≤ 0.9. For example, D2 mm / D3 mm can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.

[0080] If the ratio of the minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 to the minimum distance between the two clearance holes 22 is too small (less than 0.2), the distance between the bent section 24 and the clearance holes 22 will be large. This means the space reserved for the bent section 24 by the two clearance holes 22 will not be fully utilized, resulting in low space utilization. Conversely, if the ratio of the minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 to the minimum distance between the two clearance holes 22 is too large (greater than 0.9), the distance between the bent section 24 and the clearance holes 22 will be small. This will result in a smaller allowable error during processing and increased manufacturing difficulty.

[0081] According to the battery pack 100 provided by this utility model, the ratio of the minimum dimension of the bent section 24 on the cross section perpendicular to the central axis of the heat exchange channel 21 to the minimum distance between the two clearance holes 22 is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved by the two clearance holes 22 for the bent section 24 is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0082] As one possible implementation, refer to Figure 6 The minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 is D2 mm, where 10 mm ≤ D2 mm ≤ 45 mm. For example, D2 mm can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, or 45 mm.

[0083] If the minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 is too small, i.e., less than 10 mm, the distance between the bent section 24 and the clearance hole 22 will be large. This means the space reserved for the bent section 24 in the two clearance holes 22 will not be fully utilized, resulting in low space utilization. If the minimum dimension of the bent section 24 on the cross-section perpendicular to the central axis of the heat exchange channel 21 is too large, i.e., greater than 45 mm, the distance between the bent section 24 and the clearance hole 22 will be small. This will result in a smaller allowable error during processing and increased manufacturing difficulty.

[0084] According to the battery pack 100 provided by this utility model, the minimum size of the bent section 24 on the cross section perpendicular to the central axis of the heat exchange channel 21 is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the bent section 24 by the two clearance holes 22 is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0085] As one possible implementation, refer to Figure 5The minimum spacing between the two clearance holes 22 is D3 mm, where 20 mm ≤ D3 mm ≤ 50 mm. For example, D3 mm can be 20 mm, 23 mm, 27 mm, 32 mm, 36 mm, 41 mm, 45 mm, or 50 mm.

[0086] If the minimum distance between the two clearance holes 22 is too small, i.e., less than 20 mm, the size of the portion of the heat exchange channel 21 located between the two clearance holes 22 will be small, thus limiting the arrangement space of the heat exchange channel 21. If the minimum distance between the two clearance holes 22 is too large, i.e., greater than 50 mm, this will limit the size of the portion of the heat exchange channel 21 located between the clearance holes 22 and the first edge 121 of the housing 11 in the first direction, thus increasing the manufacturing difficulty of the heat exchange component 20. According to the battery pack 100 provided by this utility model, limiting the minimum distance between the two clearance holes 22 to the above-mentioned numerical range can ensure the arrangement space of the heat exchange channel 21 in the first direction without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0087] refer to Figure 6 and Figure 7 The heat exchange channel 21 includes an inlet section 25 and an outlet section 26, which are respectively connected to two straight sections 23. The inlet section 25 includes a first extension 251 located between a clearance hole 22 and a first edge 121 adjacent to the clearance hole 22. The outlet section 26 includes a second extension 252 located between another clearance hole 22 and a first edge 121 adjacent to the clearance hole 22. Due to the presence of the first extension 251 and the second extension 252, the area between the clearance hole 22 and the first edge 121 adjacent to the clearance hole 22 can also be arranged with the heat exchange channel 21. This implementation can increase the contact area between the heat exchange component 20 and the bottom end face 12 of the battery 10, thereby improving the heat exchange efficiency and ensuring the overall heat exchange effect of the heat exchange component 20.

[0088] refer to Figure 5 and Figure 6 In the second direction, the dimension of the first edge 121 is W mm, and the maximum dimension of the inlet section 25 is D4 mm, 0.58≤D4 mm / W mm≤4. For example, D4 ​​mm / W mm can be 0.58, 0.7, 0.85, 1.0, 1.15, 1.3, 1.5, 1.7, 2.0, 2.3, 2.6, 3.0, 3.5 or 4.

[0089] If the ratio of the maximum size of the inlet section 25 to the size of the battery 10 in the second direction is too small, i.e., less than 0.58, the contact area between the inlet section 25 and the bottom surface 12 of the battery 10 is small, thereby reducing the overall heat exchange effect of the heat exchanger 20. If the ratio of the maximum size of the inlet section 25 to the size of the battery 10 in the second direction is too large, i.e., greater than 4, the inlet section 25 extends beyond the second edge 122 of the battery 10 in the second direction, resulting in a portion of the inlet section 25 not contacting the bottom surface 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchanger 20.

[0090] According to the battery pack 100 provided by this utility model, the ratio of the maximum size of the inlet section 25 to the size of the battery 10 in the second direction is limited to the above-mentioned numerical range, which can ensure the contact area between the inlet section 25 and the bottom end face 12 of the battery 10 and ensure the heat exchange efficiency of the heat exchange element 20.

[0091] refer to Figure 5 and Figure 6 In the second direction, the dimension of the first edge 121 is W mm, and the maximum dimension of the outlet section 26 is D5 mm, 0.58≤D5 mm / W mm≤4. For example, D5 mm / W mm can be 0.58, 0.7, 0.85, 1.0, 1.15, 1.3, 1.5, 1.7, 2.0, 2.3, 2.6, 3.0, 3.5 or 4.

[0092] If the ratio of the maximum size of the outlet section 26 to the size of the battery 10 in the second direction is too small, i.e., less than 0.58, the contact area between the outlet section 26 and the bottom end face 12 of the battery 10 is small, thereby reducing the overall heat exchange effect of the heat exchanger 20. If the ratio of the maximum size of the outlet section 26 to the size of the battery 10 in the second direction is too large, i.e., greater than 4, the outlet section 26 extends beyond the second edge 122 of the battery 10 in the second direction, resulting in a portion of the outlet section 26 not contacting the bottom end face 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchanger 20.

[0093] According to the battery pack 100 provided by this utility model, by limiting the ratio of the maximum size of the outlet section 26 to the size of the battery 10 in the second direction to the above-mentioned numerical range, it is possible to ensure the contact area between the outlet section 26 and the bottom end face 12 of the battery 10, and to ensure the heat exchange efficiency of the heat exchange element 20.

[0094] refer to Figure 7The heat exchange channel 21 includes an inlet 27 and an outlet 28. The inlet 27 is located on the side of the first extension 251 opposite to the clearance hole 22, and the outlet 28 is located on the side of the second extension 252 opposite to the clearance hole 22. The projection of the inlet 27 along the first direction overlaps with the projection of the first extension 251 along the first direction, and the projection of the outlet 28 along the first direction overlaps with the projection of the second extension 252 along the first direction. According to the battery pack 100 provided by this utility model, by setting the inlet 27 to overlap with the first extension 251, it can be ensured that the heat exchange medium flows from the first extension 251 to the straight section 23. This can avoid the heat exchange medium having a low flow velocity when flowing through the first extension 251, which would affect the heat exchange effect of the bottom end surface 12 in contact with the first extension 251.

[0095] refer to Figure 2 and Figure 7 The battery pack 100 includes two rows of batteries 10 arranged along a first direction, and each row of batteries includes multiple pairs of batteries arranged along a second direction. The heat exchange channel 21 is configured to exchange heat with the two pairs of batteries 10 arranged along the first direction. According to the battery pack 100 provided by this utility model, the heat exchange channel 21 only needs to be connected to one inlet 27 and one outlet 28 to form a complete heat exchange path and exchange heat with the two pairs of batteries 10 arranged along the second direction. This implementation simplifies the structure of the heat exchange component 20 and improves space utilization.

[0096] As one possible implementation, the clearance holes 22 corresponding to each pair of batteries 10 are arranged in the same way. (See reference) Figure 7 The distance between the explosion-proof valves 13 of the two batteries 10 that are close to each other in the two pairs of batteries 10 in the figure is relatively large, so it can effectively reduce the impact of the explosion-proof valve 13 on the other explosion-proof valve 13 when one of the explosion-proof valves 13 explodes, thereby improving the safety of the battery pack 100.

[0097] As one possible implementation, the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 is A1 mm. 2 The area of ​​the bottom surface 12 of the two pairs of batteries 10 is A2 mm. 2 0.3≤A1 mm 2 / A2 mm 2 ≤0.9. For example, A1 mm 2 / A2mm 2 It can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9.

[0098] If the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 to the area of ​​the bottom end face 12 of the two pairs of batteries 10 is too small, i.e. less than 0.3, the heat exchange area between the heat exchange medium and the bottom end face 12 of the battery 10 is small, resulting in poor heat exchange effect. If the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 to the area of ​​the bottom end face 12 of the two pairs of batteries 10 is too large, i.e. greater than 0.9, the heat exchange channel 21 will extend beyond the edge of the battery 10, resulting in a portion of the heat exchange channel 21 not contacting the bottom end face 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchange element 20.

[0099] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end surface 12 of the two pairs of batteries 10 to the area of ​​the bottom end surface 12 of the two pairs of batteries 10 is limited to the above-mentioned numerical range, which can ensure the contact area between the heat exchange channel 21 and the bottom end surface 12 of the battery 10 and ensure the heat exchange efficiency of the heat exchange component 20.

[0100] As one possible implementation, the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 is A1 mm. 2 The area of ​​the bottom surface 12 of the two pairs of batteries 10 is A2 mm. 2 A1 mm 2 / A2 mm 2 It can satisfy: 0.5≤A1 mm 2 / A2mm 2 ≤0.8, for example, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8.

[0101] If the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 to the area of ​​the bottom end face 12 of the two pairs of batteries 10 is too small, i.e. less than 0.5, the heat exchange area between the heat exchange medium and the bottom end face 12 of the battery 10 is small, resulting in poor heat exchange effect. If the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end face 12 of the two pairs of batteries 10 to the area of ​​the bottom end face 12 of the two pairs of batteries 10 is too large, i.e. greater than 0.8, the heat exchange channel 21 will extend beyond the edge of the battery 10, resulting in a portion of the heat exchange channel 21 not contacting the bottom end face 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchange element 20.

[0102] According to the battery pack 100 provided by this utility model, the ratio of the projected area of ​​the heat exchange channel 21 on the bottom end surface 12 of the two pairs of batteries 10 to the area of ​​the bottom end surface 12 of the two pairs of batteries 10 is limited to the above-mentioned numerical range, which can ensure the contact area between the heat exchange channel 21 and the bottom end surface 12 of the battery 10 and ensure the heat exchange efficiency of the heat exchange component 20.

[0103] refer to Figure 3In two adjacent battery pairs 10, the explosion-proof valves 13 of the two closest batteries 10 do not overlap in the second direction. This increases the distance between the two explosion-proof valves 13, thereby effectively reducing the impact of one explosion-proof valve 13 rupturing on the other, and improving the safety of the battery pack 100.

[0104] <Example Electrical Equipment>

[0105] refer to Figure 8 This utility model provides an electrical device 200, which includes a battery pack 100.

[0106] 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.

[0107] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0108] In a non-restrictive example, refer to Figure 8 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.

[0109] 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".

[0110] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first edge and the second edge), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0111] 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 bottom end face (12) of the housing (11) is provided with an explosion-proof valve (13), the bottom end face (12) includes two first edges (121) spaced apart in a first direction and two second edges (122) spaced apart in a second direction, the size of the first edge (121) is smaller than the size of the second edge (122), and the first direction, the second direction and the up and down direction are perpendicular to each other; as well as A heat exchanger (20) includes a plurality of heat exchange channels (21) and a plurality of clearance holes (22), the plurality of heat exchange channels (21) extending along a first direction, the plurality of clearance holes (22) being spaced along a second direction and receiving explosion-proof valves (13) of the plurality of batteries (10), wherein the battery pack (100) includes a plurality of pairs of batteries (10) arranged along the second direction, at least a portion of the heat exchange channels (21) being located between two clearance holes (22) of a pair of batteries (10), in the first direction, the distances from the clearance holes (22) to the two first edges (121) of the bottom end face (12) of the corresponding battery (10) are different, and the two clearance holes (22) are spaced apart in the first direction.

2. The battery pack (100) according to claim 1, characterized in that, In the first direction, the distance from the clearance hole (22) to one first edge (121) of the bottom end face (12) of the corresponding battery (10) is L1 mm, and the distance from the clearance hole (22) to the other first edge (121) of the bottom end face (12) of the corresponding battery (10) is L2 mm, L1 mm <L2 mm,0.066≤L1 mm / L2 mm<1。 3. The battery pack (100) according to claim 1, characterized in that, In the first direction, the distance from the clearance hole (22) to a first edge (121) of the bottom end face (12) of the corresponding battery (10) is L1 mm, 10 mm ≤ L1 mm ≤ 50 mm.

4. The battery pack (100) according to claim 3, characterized in that, In the first direction, the distance from the clearance hole (22) to the other first edge (121) of the bottom end face (12) of the corresponding battery (10) is L2 mm, 50 mm. <L2 mm≤150mm。 5. The battery pack (100) according to claim 1, characterized in that, In the first direction, the size of the battery (10) is L3 mm, the minimum distance between the two clearance holes (22) is L4 mm, and 0.05≤L4 mm / L3 mm≤0.

2.

6. The battery pack (100) according to claim 5, characterized in that, In the first direction, the minimum distance between the two clearance holes (22) is L4 mm, 10 mm ≤ L4 mm ≤ 30 mm.

7. The battery pack (100) according to claim 6, characterized in that, The minimum distance between the two clearance holes (22) of each pair of batteries (10) located on both sides of the plurality of batteries (10) in the second direction is L41 mm, and the minimum distance between the two clearance holes (22) of a pair of batteries (10) located at the middle position of the plurality of batteries (10) in the second direction is L42 mm, L41 mm. <L42 mm。 8. The battery pack (100) according to claim 1, characterized in that, The heat exchange channel (21) includes two straight sections (23) and a bent section (24). The projection of the clearance hole (22) along the second direction overlaps with the projection of the straight section (23) along the second direction. The bent section (24) connects the two straight sections (23) and is located between the two clearance holes (22). In the second direction, the dimension of the straight section (23) is D1 mm, and the dimension of the first edge (121) is W mm, 0.25≤D1 mm / W mm≤0.

85.

9. The battery pack (100) according to claim 8, characterized in that, The straight section (23) has a dimension of D1 mm in the second direction, and the bending section (24) has a minimum dimension of D2 mm in the cross section perpendicular to the central axis of the heat exchange channel (21), where 0.6 ≤ D2 mm / D1 mm ≤ 0.

9.

10. The battery pack (100) according to claim 8, characterized in that, The minimum dimension of the bent section (24) on the cross section perpendicular to the central axis of the heat exchange channel (21) is D2 mm, and the minimum distance between the two clearance holes (22) is D3 mm, 0.2≤D2 mm / D3 mm≤0.

9.

11. The battery pack (100) according to claim 8 or 9, characterized in that, In the second direction, the dimension of the straight section (23) is D1 mm, 15 mm ≤ D1 mm ≤ 50 mm.

12. The battery pack (100) according to claim 8, characterized in that, In the second direction, the dimension of the first edge (121) is W, in mm, where 20 mm ≤ W mm ≤ 60 mm.

13. The battery pack (100) according to claim 9 or 10, characterized in that, The minimum dimension of the bent section (24) on the cross section perpendicular to the central axis of the heat exchange channel (21) is D2 mm, 10 mm ≤ D2 mm ≤ 45 mm.

14. The battery pack (100) according to claim 10, characterized in that, The minimum distance between the two clearance holes (22) is D3 mm, where 20 mm ≤ D3 mm ≤ 50 mm.

15. The battery pack (100) according to claim 8, characterized in that, The heat exchange channel (21) includes an inlet section (25) and an outlet section (26), which are respectively connected to the two straight sections (23). The inlet section (25) includes a first extension (251) located between a clearance hole (22) and a first edge (121) adjacent to the clearance hole (22). The outlet section (26) includes a second extension (252) located between another clearance hole (22) and a first edge (121) adjacent to the clearance hole (22).

16. The battery pack (100) according to claim 15, characterized in that, In the second direction, the size of the first edge (121) is W mm, the maximum size of the inlet section (25) is D4 mm, D1 mm≤D4 mm, 0.58≤D4 mm / W mm≤4, and the maximum size of the outlet section (26) is D5 mm, D1 mm≤D5 mm, 0.58≤D5 mm / W mm≤4.

17. The battery pack (100) according to claim 15, 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 extension (251) away from the clearance hole (22), and the outlet (28) is located on the side of the second extension (252) away from the clearance hole (22). The projection of the inlet (27) along the first direction overlaps with the projection of the first extension (251) along the first direction, and the projection of the outlet (28) along the first direction overlaps with the projection of the second extension (252) along the first direction.

18. The battery pack (100) according to claim 1, 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, and the heat exchange channel (21) is configured to exchange heat with the two pairs of batteries (10) arranged along the first direction.

19. The battery pack (100) according to claim 18, characterized in that, The arrangement of the clearance holes (22) for each pair of batteries (10) is the same.

20. The battery pack (100) according to claim 18, characterized in that, The projected area of ​​the heat exchange channel (21) on the bottom end face (12) of the two pairs of batteries (10) is A1 mm. 2 The area of ​​the bottom end face (12) of the two pairs of batteries is A2mm. 2 0.3≤A1 mm 2 / A2 mm 2 ≤0.

9.

21. The battery pack (100) according to claim 18, characterized in that, The projected area of ​​the heat exchange channel (21) on the bottom end face (12) of the two pairs of batteries (10) is A1 mm. 2 The area of ​​the bottom end face (12) of the two pairs of batteries (10) is A2 mm. 2 0.5≤A1 mm 2 / A2 mm 2 ≤0.

8.

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

23. An electrical appliance (200), characterized in that, The battery pack (100) includes any one of claims 1 to 22.

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