Battery pack and electric device with same

Abstract

The utility model relates to a battery pack and electric equipment with it, and the battery pack includes a plurality of batteries and heat exchange spare. The battery includes the casing, and the casing is equipped with the explosion -proof valve in the one side of up -and -down direction, and the size of casing in the first direction is greater than the size of casing in the second direction, and the first direction, the second direction and up -and -down direction are perpendicular two two. The heat exchange spare is located the same side with the explosion -proof valve in the casing in the up -and -down direction, and includes a plurality of along the flow passage of first direction extension and a plurality of along the spacing of second direction, and the explosion -proof valve of one of a plurality of batteries is received to the through -hole, and the battery pack includes a plurality of pairs of batteries along the arrangement of second direction, and the part of flow passage between two through -holes corresponding to a pair of batteries in the second direction is D1mm, and the maximum size of the edge of two batteries in the second direction is W mm, and 0.08D1mm / W mm is less than or equal to 4, to ensure that the arrangement space of flow passage in the second direction.

Description

Technical Field

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

[0002] As a core component of electric vehicles, energy storage systems, and other devices, the safety and reliability of battery packs are of paramount importance. During charging and discharging, batteries continuously generate heat. Insufficient heat dissipation can easily lead to localized overheating and even thermal runaway. To mitigate this issue, many battery packs are equipped with heat exchange components that achieve efficient heat exchange through contact with the battery surface, preventing localized overheating.

[0003] However, battery casings are typically equipped with explosion-proof valves to release pressure promptly when internal pressure becomes too high. The placement of these valves often restricts the design space of the flow channels, forcing a reduction in the cross-sectional area. This structural constraint reduces the flow efficiency of the heat exchange medium, weakens the overall heat dissipation capacity, and adversely affects the thermal management performance of the battery pack. Utility Model Content

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

[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 one side in the vertical direction. The size of the housing in the first direction is larger than its size in the second direction, and the first, second, and vertical directions are perpendicular to each other. The heat exchanger and the explosion-proof valve are located on the same side of the housing in the vertical direction, and include multiple flow channels extending along the first direction and multiple through holes spaced apart along the second direction. The through holes receive the explosion-proof valve of one of the multiple batteries. The battery pack includes multiple pairs of batteries arranged along the second direction. The portion of each flow channel located between the two through holes corresponding to a pair of batteries has a size of D1 mm in the second direction. The maximum size of the edges of the two batteries in the second direction is W mm, where 0.08 ≤ D1 mm / W mm ≤ 4.

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

[0007] The beneficial effects of the battery pack provided by this utility model are as follows:

[0008] By limiting the ratio of the dimension of the portion of the flow channel located between the two through holes corresponding to a pair of batteries in the second direction to the maximum dimension of the edges of the two batteries in the second direction, more space can be provided for the flow channel in the second direction. This method helps to reduce flow resistance, improve the flow efficiency of the heat exchange medium, and thus ensure the overall heat exchange performance of the heat exchanger. On the other hand, it also ensures the installation space for the explosion-proof valve. 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 1 A schematic diagram of a portion of the battery pack.

[0020] Figure 8 yes Figure 3 A schematic diagram of a part of the structure.

[0021] Figure 9 This is a schematic diagram of a portion of a battery pack according to another embodiment of the present invention.

[0022] Figure 10 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0023] Reference numerals: Battery pack-100; Battery-10; Housing-11; Explosion-proof valve-12; Heat exchanger-20; Flow channel-21; Through hole-22; Straight section-23; First straight section-231; Second straight section-232; Third straight section-233; Narrowing section-24; First narrowing section-241; Second narrowing section-242; First panel-234; Second panel-235; Recess-25; First recess-251; Second recess-252; Heat insulation component-30; Electrical equipment-200. Detailed Implementation

[0024] 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.

[0025] <Example Battery>

[0026] 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.

[0027] The battery 10 includes a housing 11 and battery cells (not shown) disposed within the housing 11.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Continue to refer to Figure 4 An explosion-proof valve 12 is provided at the bottom of the housing 11. The explosion-proof valve 12 is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of the battery 10 reaches a predetermined threshold. During the use of the battery 10, the explosion-proof valve 12 is mainly used to allow gas inside the battery 10 to be discharged in order to reduce the internal pressure of the battery 10 in order to prevent the battery from deforming or exploding due to excessive increase in internal pressure when thermal runaway or other situations occur.

[0035] It is understood that this utility model does not impose any special restrictions on the material of the explosion-proof valve 12. As an example, the explosion-proof valve 12 can be made of aluminum, steel, or an alloy.

[0036] It is understood that the present invention does not impose any particular restrictions on the shape of the explosion-proof valve 12. For example, the shape of the explosion-proof valve 12 can be one of square, oblong, elliptical and racetrack shape.

[0037] It is understood that this utility model does not impose any special restrictions on the type of explosion-proof valve 12. For example, the explosion-proof valve 12 can be a grooved explosion-proof valve, or it can be formed by stamping or laser etching.

[0038] <Example Battery Pack>

[0039] 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.

[0040] 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.

[0041] 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.

[0042] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 3 The battery pack 100 also includes a heat exchanger 20, which is used to dissipate heat from the battery 10 to regulate the temperature of the battery 10. Specifically, when the operating temperature of the battery 10 is too low, the heat exchanger 20 is used to raise the temperature of the battery 10; when the operating temperature of the battery 10 is too high, the heat exchanger 20 is used to lower the temperature of the battery 10.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped.

[0048] 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.

[0049] In the current embodiment, reference is made to Figure 2 and Figure 3 The heat exchanger 20 and the explosion-proof valve 12 are located on the lower side of the housing 11, and include a plurality of flow channels 21 extending in a first direction and a plurality of through holes 22 spaced in a second direction, each through hole 22 receiving the explosion-proof valve 12 of one of the plurality of batteries 10.

[0050] refer to Figure 3 and Figure 5 The battery pack 100 includes multiple pairs of batteries 10 arranged along a second direction. The portion of the flow channel 21 located between two through holes 22 corresponding to a pair of batteries 10 has a dimension of D1 mm in the second direction. The maximum dimension of the edges of the two batteries 10 in the second direction is W mm, where 0.08 ≤ D1 mm / W mm ≤ 4. For example, D1 mm / W mm can be 0.08, 0.1, 0.2, 0.4, 0.6, 0.8, 1, 1.5, 2, 2.5, 3, 3.5, or 4.

[0051] If the ratio of the dimension of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction to the maximum dimension of the edges of the two batteries 10 in the second direction is too small, i.e., less than 0.08, then the dimension of the portion of the flow channel 21 between the two through holes 22 in the second direction is small. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchanger 20. If the ratio of the dimension of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction to the maximum dimension of the edges of the two batteries 10 in the second direction is too large, i.e., greater than 4, then the dimension of the portion of the flow channel 21 between the two through holes 22 in the second direction is large. This will result in limited installation space for the explosion-proof valve 12.

[0052] According to the battery pack 100 provided by this utility model, the ratio of the size of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction to the maximum size of the edges of the two batteries 10 in the second direction is limited to the above-mentioned numerical range, which can ensure both the size of the flow channel 21 in the second direction and the installation space of the explosion-proof valve 12.

[0053] As one possible implementation, the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 has a dimension of D1 mm in the second direction, where 5 mm ≤ D1 mm ≤ 20 mm. For example, D1 mm can be 5 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, or 20 mm.

[0054] If the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 has a dimension in the second direction that is too small (less than 5 mm), the flow channel 21 between the two through holes 22 will have a smaller dimension in the second direction. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchanger 20. If the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 has a dimension in the second direction that is too large (greater than 20 mm), the flow channel 21 between the two through holes 22 will have a larger dimension in the second direction. This will restrict the installation space of the explosion-proof valve 12.

[0055] According to the battery pack 100 provided by this utility model, the size of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction is limited to the above-mentioned numerical range, which can ensure both the size of the flow channel 21 in the second direction and the installation space of the explosion-proof valve 12.

[0056] refer to Figure 5 and Figure 8The battery pack 100 also includes a plurality of heat insulation elements 30, each heat insulation element 30 being located between two adjacent batteries 10. The heat insulation element 30 has a dimension of L1 mm in the second direction. The portion of the flow channel 21 located between the two corresponding through holes 22 of a pair of batteries 10 has a dimension of D1 mm in the second direction, where 0.1 ≤ L1 mm / D1 mm ≤ 0.5. For example, L1 mm / D1 mm can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5.

[0057] If the ratio of the dimension of the heat insulation element 30 in the second direction to the dimension of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction is too small (i.e., less than 0.1), the dimension of the heat insulation element 30 in the second direction is small. This will result in poor heat absorption and blocking effect of the heat insulation element 30. When one battery 10 experiences thermal runaway, the high temperature it generates will be rapidly conducted to the adjacent battery 10, causing its temperature to exceed the safety threshold in a very short time, thereby triggering a chain reaction and causing thermal runaway of the entire battery pack 100. If the ratio of the dimension of the heat insulation element 30 in the second direction to the dimension of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction is too large (i.e., greater than 0.5), the dimension of the portion of the flow channel 21 between the two through holes 22 in the second direction is small. This will increase the flow resistance of the heat exchange medium, reduce its flow efficiency, and be detrimental to the heat exchange effect of the heat exchange element 20.

[0058] According to the battery pack 100 provided by this utility model, the ratio of the size of the heat insulation member 30 in the second direction to the size of the portion of the flow channel 21 located between the two through holes 22 corresponding to a pair of batteries 10 in the second direction is limited to the above-mentioned numerical range. This can ensure the heat insulation member 30's effect of absorbing and blocking heat, preventing thermal runaway of the entire battery pack 100, and also ensure the arrangement space of the flow channel 21 in the second direction.

[0059] As one possible implementation, the dimension of the thermal insulation element 30 in the second direction is L1 mm, where 1.5 mm ≤ L1 mm ≤ 8 mm. For example, L1 mm can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm.

[0060] If the thermal insulation component 30 is too small in the second direction (less than 1.5 mm), its heat absorption and blocking effect will be poor. When one battery 10 experiences thermal runaway, the high temperature it generates will be rapidly conducted to adjacent batteries 10, causing their temperatures to exceed the safety threshold in a very short time, thus triggering a chain reaction and leading to thermal runaway of the entire battery pack 100. If the thermal insulation component 30 is too large in the second direction (greater than 8 mm), it will increase the size of the battery pack in the second direction, thereby increasing the volume of the battery pack, which is detrimental to the energy density of the battery pack.

[0061] According to the battery pack 100 provided by this utility model, the size of the heat insulation member 30 in the second direction is limited to the above-mentioned numerical range, which can not only ensure the heat insulation member 30's effect of absorbing and blocking heat and avoid thermal runaway of the entire battery pack 100, but also control the size of the battery pack 100 in the second direction, thereby ensuring the energy density of the battery pack 100.

[0062] As one possible implementation, the compression rate of the insulation element 30 is E%, 10% ≤ E% ≤ 50%. For example, E% can be 10%, 11%, 12%, 13%, 14%, or 15%.

[0063] If the compression rate of the heat insulation component 30 is too small, i.e., less than 10%, the heat insulation component 30 cannot adapt to the gap between two adjacent batteries 10, thus affecting the assembly process of the batteries 10. If the compression rate of the heat insulation component 30 is too large, i.e., greater than 50%, the heat insulation component 30 may become thinner and fail after being over-compressed. According to the battery pack 100 provided by this utility model, limiting the compression rate of the heat insulation component 30 to the above-mentioned value range can ensure that the heat insulation component 30 adapts to the gap between two adjacent batteries 10, and can also prevent the heat insulation component 30 from becoming thinner and failing after being over-compressed.

[0064] As one possible implementation, the thermal conductivity of the insulation element 30 is KW / (m·K), where 0.02W / (m·K)≤KW / (m·K)≤0.1W / (m·K). For example, KW / (m·K) can be 0.02W / (m·K), 0.03W / (m·K), 0.05W / (m·K), 0.07W / (m·K), 0.09W / (m·K), or 0.1W / (m·K).

[0065] If the thermal conductivity of the insulation component 30 is too low, i.e., less than 0.02 W / (m·K), the heat generated by the battery cannot be conducted between multiple batteries, causing heat to accumulate around a single battery 10, resulting in excessively high temperature. If the thermal conductivity of the insulation component 30 is too high, i.e., greater than 0.1 W / (m·K), the insulation component 30 will have a poor effect on absorbing and blocking heat. When one battery 10 experiences thermal runaway, the high temperature it generates will be rapidly conducted to adjacent batteries 10, causing their temperatures to exceed the safety threshold in a very short time, thereby triggering a chain reaction that leads to thermal runaway of the entire battery pack 100.

[0066] According to the battery pack 100 provided by this utility model, the thermal conductivity of the heat insulation component 30 is limited to the above-mentioned value range, which can not only prevent local overheating of the battery pack 100, but also ensure the heat insulation component 30's effect of absorbing and blocking heat, thus preventing thermal runaway of the entire battery pack 100.

[0067] It is understood that this utility model does not impose any special restrictions on the material of the heat insulation component 30. For example, the material of the heat insulation component 30 may be one of ceramic fiber aerogel, glass fiber aerogel, or composite phase change material.

[0068] refer to Figure 5 In the second direction, the minimum distance from the through hole 22 to the flow channel 21 is D2 mm, and the maximum dimension of the edges of the two batteries 10 in the second direction is W mm, where 0.08 ≤ D2 mm / W mm ≤ 0.25. For example, D2 / W can be 0.08, 0.1, 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, or 0.25.

[0069] If the ratio of the minimum distance between the through hole 22 and the flow channel 21 to the maximum dimension of the edges of the two batteries 10 in the second direction is too small (less than 0.08), the distance between the through hole 22 and the flow channel 21 will be small, resulting in a smaller allowable error during processing and increased manufacturing difficulty. If the ratio of the minimum distance between the through hole 22 and the flow channel 21 to the maximum dimension of the edges of the two batteries 10 in the second direction is too large (greater than 0.25), the distance between the flow channel 21 and the through hole 22 will be large. In this case, the arrangement space reserved by the two through holes 22 for the flow channel 21 in the second direction will not be fully utilized, resulting in low space utilization.

[0070] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the through hole 22 to the flow channel 21 to the maximum dimension of the edge of the two batteries 10 in the second direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved by the two through holes 22 for the flow channel 21 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchanger 20.

[0071] As one possible implementation, in the second direction, the minimum distance from the through hole 22 to the flow channel 21 is D2mm, where 5mm ≤ D2mm ≤ 12mm. For example, D2mm can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, or 12mm.

[0072] If the minimum distance between the through-hole 22 and the flow channel 21 in the second direction is too small, i.e., less than 5 mm, the spacing between the through-hole 22 and the flow channel 21 is small. This will result in a smaller allowable error during processing and increased manufacturing difficulty. In addition, a small spacing between the through-hole 22 and the flow channel 21 will also increase the risk of heat exchange medium leakage within the flow channel 21. If the minimum distance between the through-hole 22 and the flow channel 21 is too large, i.e., greater than 12 mm, the distance between the flow channel 21 and the through-hole 22 is large. In this case, the arrangement space reserved for the flow channel 21 by the two through-holes 22 in the second direction is not fully utilized, resulting in low space utilization.

[0073] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the through hole 22 to the flow channel 21 to the maximum dimension of the edge of the two batteries 10 in the second direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved by the two through holes 22 for the flow channel 21 in the second direction is fully utilized, reduces the risk of heat exchange medium leakage in the flow channel 21, and does not excessively increase the manufacturing difficulty of the heat exchange component 20.

[0074] As one possible implementation, in the first direction, the minimum distance from the through hole 22 to the edge of the corresponding housing 11 is D3 mm, where 40 mm ≤ D3 mm ≤ 150 mm. For example, D3 mm can be 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, or 150 mm.

[0075] If the minimum distance from the through-hole 22 to the edge of the corresponding housing 11 in the first direction is too small, i.e. less than 40 mm, this will limit the size of the portion of the flow channel 21 located between the through-hole 22 and the edge of the housing 11 in the first direction, thereby increasing the manufacturing difficulty. If the minimum distance from the through-hole 22 to the edge of the corresponding housing 11 in the first direction is too large, i.e. greater than 150 mm, this will limit the length of the through-hole 22 in the first direction, thereby limiting the installation space of the explosion-proof valve 12.

[0076] According to the battery pack 100 provided by this utility model, the minimum distance from the through hole 22 to the edge of the corresponding housing 11 in the first direction is limited to the above-mentioned numerical range, which can ensure the installation space of the explosion-proof valve 12 without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0077] As one possible implementation, in the second direction, the minimum distance from the through hole 22 to the edge of the corresponding housing 11 is D4 mm, where 2 mm ≤ D4 mm ≤ 6 mm. For example, D4 ​​mm can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm.

[0078] If the minimum distance from the through-hole 22 to the edge of the corresponding housing 11 in the second direction is too small, i.e., less than 2 mm, the distance between the through-hole 22 and the edge of the housing 11 in the second direction will be small. This will result in a smaller allowable error during processing and increased manufacturing difficulty. In addition, the explosion-proof valve 12 is close to the housing 11 in the second direction, which is not conducive to the structural strength of the housing 11. If the minimum distance from the through-hole 22 to the edge of the corresponding housing 11 in the second direction is too large, i.e., greater than 6 mm, it will restrict the size of the part of the flow channel 21 located between the two through-holes 21 in the second direction, thereby increasing the flow resistance of the heat exchange medium, reducing its flow efficiency, and being detrimental to the heat exchange effect of the heat exchange element 20.

[0079] According to the battery pack 100 provided by this utility model, the minimum distance from the through hole 22 to the edge of the corresponding housing 11 in the second direction is limited to the above-mentioned numerical range. This can ensure the structural strength of the housing 11, the heat exchange effect of the heat exchanger 20, and will not excessively increase the manufacturing difficulty of the heat exchanger 20.

[0080] refer to Figure 2 , Figure 5 and Figure 6 The battery pack 100 includes two rows of batteries 10 arranged along a first direction. Each row of batteries 10 includes multiple pairs of batteries 10 arranged along a second direction. Each flow channel 21 is configured to exchange heat with the two pairs of batteries 10 arranged along the first direction. The flow channel 21 includes a straight section 23 and a narrowing section 24. The straight section 23 includes a first straight section 231, a second straight section 232, and a third straight section 233. The narrowing section 24 includes a first narrowing section 241 and a second narrowing section 242. The first narrowing section 241 connects the first straight section 231 and the second straight section 232, and the second narrowing section 242 connects the second straight section 232 and the third straight section 233. According to the battery pack 100 provided by this utility model, the flow channel 21 only needs to be connected to one inlet and one outlet to form a complete heat exchange flow path 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.

[0081] As one possible implementation, the projected area of ​​the flow channel 21 along the vertical direction is A1 mm. 2 The projected area of ​​the casing 11 of the two pairs of batteries 10 along the vertical direction is A2 mm. 2 0.3≤A1 mm 2 / A2 mm 2 ≤0.9. For example, A1 mm 2 / A2 mm 2 It can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9.

[0082] If the ratio of the vertical projection area of ​​the flow channel 21 to the vertical projection area of ​​the housing 11 of the two pairs of batteries 10 is too small (less than 0.3), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is small, resulting in poor heat exchange performance. If the ratio of the vertical projection area of ​​the flow channel 21 to the vertical projection area of ​​the housing 11 of the two pairs of batteries 10 is too large (greater than 0.9), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is large, which results in a smaller area of ​​the through hole 22, thus limiting the installation space of the explosion-proof valve 12.

[0083] 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 housing 11 of the two pairs of batteries 10 in the vertical direction is limited to the above-mentioned numerical range. This can ensure the contact area between the heat exchange medium and the housing 11 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the explosion-proof valve 12.

[0084] As another possible implementation, the projected area of ​​the flow channel 21 along the vertical direction is A1 mm. 2 The projected area of ​​the casing 11 of the two pairs of batteries 10 along the vertical direction is A2 mm. 2 0.5≤A1 mm 2 / A2 mm 2 ≤0.8. For example, A1mm 2 / A2 mm 2 It can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8.

[0085] If the ratio of the vertical projection area of ​​the flow channel 21 to the vertical projection area of ​​the housing 11 of the two pairs of batteries 10 is too small (less than 0.5), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is small, resulting in poor heat exchange performance. If the ratio of the vertical projection area of ​​the flow channel 21 to the vertical projection area of ​​the housing 11 of the two pairs of batteries 10 is too large (greater than 0.8), the heat exchange area between the heat exchange medium and the housing 11 of the battery 10 is large, which results in a smaller area of ​​the through hole 22, thus limiting the installation space of the explosion-proof valve 12.

[0086] 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 housing 11 of the two pairs of batteries 10 in the vertical direction is limited to the above-mentioned numerical range. This can ensure the contact area between the heat exchange medium and the housing 11 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange component 20, and also reserve sufficient installation space for the explosion-proof valve 12.

[0087] refer to Figure 7 The second straight section 232 includes a first panel 234 and a second panel 235 spaced apart along the vertical direction. The first panel 234 is closer to the housing 11 than the second panel 235. The second panel 235 has a recess 25 that protrudes from the second panel 235 toward the first panel 234. The orthographic projection of the recess 25 along the first direction overlaps with the orthographic projection of the first narrowing section 241 along the first direction, and the orthographic projection of the recess 25 along the first direction overlaps with the orthographic projection of the second narrowing section 242 along the first direction. Because the dimensions of the second straight section 232 and the first narrowing section 241 of the flow channel 21 are different in the second direction, the flow area of ​​the heat exchange medium will change abruptly, resulting in uneven flow velocity distribution. To address this, the battery pack 100 provided by this invention has a recess 25 on the second straight section 232. The recess 25 can reduce the flow area of ​​the second straight section 232, reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, and thus enable the heat exchange medium to flow smoothly.

[0088] refer to Figure 8 The recess 25 includes a first recess 251 and a second recess 252 spaced apart along a second direction. In the second direction, the first recess 251, the heat insulation element 30, and the second recess 252 are arranged sequentially, and the distance between the first recess 251 and the second recess 252 is equal to the size of the heat insulation element 30. When the heat exchange medium flows from the first narrowing section 241 to the second straight section 232, the flow resistance between the two first recesses 251 and between the two second recesses 252 is relatively large. Therefore, the flow path of the heat exchange medium will bypass the two first recesses 251 and the two second recesses 252, thereby reducing the flow area of ​​the flow channel 21 and reducing the abrupt change in the flow area of ​​the heat exchange medium along the flow path, thus enabling the heat exchange medium to flow smoothly.

[0089] As one possible implementation, refer to Figure 9 The explosion-proof valves 12 of two adjacent battery pairs 10 that are close to each other do not overlap at least partially in the orthogonal projection along the second direction. This can increase the distance between the two explosion-proof valves 12, thereby effectively reducing the impact of one explosion-proof valve 12 on the other explosion-proof valve 12 when it bursts, and improving the safety of the battery pack 100.

[0090] <Example Electrical Equipment>

[0091] refer to Figure 10This utility model provides an electrical device 200, which includes a battery pack 100.

[0092] 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.

[0093] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0094] In a non-restrictive example, refer to Figure 10 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.

[0095] 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".

[0096] 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 recess and the second recess), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0097] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: Multiple batteries (10), each battery (10) includes a housing (11), the housing (11) having an explosion-proof valve (12) on one side in the vertical direction, the housing (11) having a larger dimension in a first direction than in a second direction, the first direction, the second direction and the vertical direction being perpendicular to each other; as well as A heat exchanger (20) is located on the same side of the housing (11) in the vertical direction as the explosion-proof valve (12), and includes a plurality of flow channels (21) extending in the first direction and a plurality of through holes (22) spaced apart in the second direction. The through holes (22) receive the explosion-proof valve (12) of one of the plurality of batteries (10). The battery pack (100) includes a plurality of pairs of batteries (10) arranged in the second direction. The portion of the flow channel (21) between the two through holes (22) corresponding to a pair of batteries (10) has a dimension of D1 mm in the second direction. The maximum dimension of the edges of the two batteries (10) in the second direction is W mm, and 0.08 ≤ D1 mm / W mm ≤ 4.

2. The battery pack (100) according to claim 1, characterized in that, The portion of the flow channel (21) located between the two through holes (22) corresponding to a pair of batteries (10) has a dimension of D1 mm in the second direction, where 5 mm ≤ D1 mm ≤ 20 mm.

3. The battery pack (100) according to claim 1, characterized in that, It also includes a plurality of heat insulation elements (30), which are located between two adjacent batteries (10). The heat insulation element (30) has a dimension of L1 mm in the second direction. The portion of the flow channel (21) located between the two through holes (22) corresponding to a pair of batteries (10) has a dimension of D1 mm in the second direction, where 0.1 ≤ L1 mm / D1 mm ≤ 0.

5.

4. The battery pack (100) according to claim 3, characterized in that, The dimension of the heat insulation element (30) in the second direction is L1 mm, 1.5 mm ≤ L1 mm ≤ 8 mm.

5. The battery pack (100) according to claim 3, characterized in that, The compression rate of the insulation element (30) is E%, 10% ≤ E% ≤ 50%.

6. The battery pack (100) according to claim 3, characterized in that, The thermal conductivity of the insulation component (30) is KW / (m·K), 0.02W / (m·K)≤KW / (m·K)≤0.1W / (m·K).

7. The battery pack (100) according to claim 3, characterized in that, The heat insulation component (30) is made of one of the following materials: ceramic fiber aerogel, glass fiber aerogel, or composite phase change material.

8. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the through hole (22) to the flow channel (21) is D2 mm, and the maximum dimension of the edges of the two batteries (10) in the second direction is W mm, 0.08≤D2 mm / W mm≤0.

25.

9. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the through hole (22) to the flow channel (21) is D2 mm, where 5 mm ≤ D2 mm ≤ 12 mm.

10. The battery pack (100) according to claim 1, characterized in that, In the first direction, the minimum distance from the through hole (22) to the edge of the corresponding housing (11) is D3 mm, 40 mm ≤ D3 mm ≤ 150 mm.

11. The battery pack (100) according to claim 1, characterized in that, In the second direction, the minimum distance from the through hole (22) to the edge of the corresponding housing (11) is D4 mm, where 2 mm ≤ D4 mm ≤ 6 mm.

12. The battery pack (100) according to claim 3, characterized in that, The device includes two rows of batteries (10) arranged along the first direction, each row of batteries (10) including multiple pairs of batteries (10) arranged along the second direction. The flow channel (21) is configured to exchange heat with the two pairs of batteries (10) arranged along the first direction. The flow channel (21) includes a straight section (23) and a narrowing section (24). The straight section (23) includes a first straight section (231), a second straight section (232) and a third straight section (233). The narrowing section (24) includes a first narrowing section (241) and a second narrowing section (242). The first narrowing section (241) connects the first straight section (231) and the second straight section (232). The second narrowing section (242) connects the second straight section (232) and the third straight section (233).

13. The battery pack (100) according to claim 12, characterized in that, The projected area of ​​the flow channel (21) along the vertical direction is A1 mm. 2 The projected area of ​​the casing (11) of the two pairs of batteries (10) along the vertical direction is A2mm. 2 0.3≤A1 mm 2 / A2 mm 2 ≤0.

9.

14. The battery pack (100) according to claim 12, characterized in that, The projected area of ​​the flow channel (21) along the vertical direction is A1 mm. 2 The projected area of ​​the casing (11) of the two pairs of batteries (10) along the vertical direction is A2mm. 2 0.5≤A1 mm 2 / A2 mm 2 ≤0.

8.

15. The battery pack (100) according to claim 12, characterized in that, The second straight section (232) includes a first panel (234) and a second panel (235) spaced apart along the vertical direction. The first panel (234) is closer to the housing (11) than the second panel (235). The second panel (235) has a recess (25) that protrudes from the second panel (235) toward the first panel (234). The orthographic projection of the recess (25) along the first direction overlaps with the orthographic projection of the first narrowing section (241) along the first direction. The orthographic projection of the recess (25) along the first direction overlaps with the orthographic projection of the second narrowing section (242) along the first direction.

16. The battery pack (100) according to claim 15, characterized in that, The recess (25) includes a first recess (251) and a second recess (252) spaced apart along the second direction. In the second direction, the first recess (251), the heat insulation member (30) and the second recess (252) are arranged in sequence, and the distance between the first recess (251) and the second recess (252) is equal to the size of the heat insulation member (30).

17. The battery pack (100) according to claim 1, characterized in that, The explosion-proof valves (12) of two adjacent pairs of batteries (10) that are close to each other do not overlap at least partially in the orthographic projection along the second direction.

18. An electrical appliance (200), characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 17.

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