Battery pack and electric device with same

Abstract

The utility model relates to battery pack and the electric equipment with it. Battery pack includes a plurality of batteries and heat exchange spare. The battery includes the casing, and the bottom end surface of casing is equipped with two explosion -proof valves, and two explosion -proof valves are spaced in the first direction, and a plurality of batteries arrange along the second direction. The heat exchange spare includes the heat exchange runner and a plurality of avoiding holes, and the heat exchange runner extends along the second direction, and a plurality of avoiding holes receive the explosion -proof valve of a plurality of batteries, and the up and down direction, the first direction and the second direction are perpendicular two by two. The heat exchange runner includes wide part and narrow part, and the narrow part is located between two avoiding holes of a plurality of avoiding holes in the first direction, and the projection of wide part along the second direction partially overlaps with two avoiding holes, and in the first direction, the maximum size of wide part is L1, and the unit is mm, and the size of casing is W1, and the unit is mm, 0.75≤L1 / W1≤0.97, and therefore, wide part can occupy more space in the first direction, thereby increasing the contact area of heat exchange spare and the bottom end surface of battery.

Description

Technical Field

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

[0002] As a crucial component of devices such as electric vehicles and energy storage systems, the safety and reliability of battery packs are paramount. During actual operation, batteries generate significant heat during charging and discharging. Insufficient or uneven heat dissipation can easily lead to localized overheating, potentially causing thermal runaway. To address this, some battery packs are equipped with heat exchange components that come into contact with the battery to exchange heat and prevent safety risks such as thermal runaway caused by localized overheating.

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

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

[0005] The battery pack provided by this utility model includes multiple batteries and a heat exchange component. Each battery includes a housing with two explosion-proof valves on its bottom surface, spaced apart in a first direction. Multiple batteries are arranged along a second direction. The heat exchange component includes a heat exchange channel and multiple clearance holes. The heat exchange channel extends along the second direction, and the clearance holes receive the explosion-proof valves of the multiple batteries. The channel is perpendicular to each other in both the vertical direction and the first and second directions. The heat exchange channel includes a wide portion and a narrow portion. The narrow portion is located between two clearance holes in the first direction, and the projection of the wide portion along the second direction partially overlaps with the two clearance holes. In the first direction, the maximum dimension of the wide portion is L1 (mm), and the dimension of the housing is W1 (mm), where 0.75 ≤ L1 / W1 ≤ 0.97.

[0006] The beneficial effects of the battery pack provided by this utility model are as follows: The projection of the wide portion along the second direction partially overlaps with the two clearance holes, while the narrow portion is located between the two clearance holes in the first direction. Therefore, the size of the wide portion in the first direction is larger than that of the narrow portion in the first direction. In this way, the wide portion can occupy more space in the first direction, thereby increasing the contact area between the heat exchanger and the bottom surface of the battery, thereby improving the heat exchange efficiency and ensuring the overall heat exchange effect of the heat exchanger.

[0007] On the other hand, this utility model also provides an electrical device, which includes the battery pack mentioned above. Attached Figure Description

[0008] 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.

[0009] 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.

[0010] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0011] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0012] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 A bottom view of the battery pack.

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

[0015] Figure 4 yes Figure 2 A schematic diagram of a part of the structure.

[0016] Figure 5 yes Figure 2 A schematic diagram of a part of the structure.

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

[0018] Figure 7 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0019] Figure 8 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0020] Reference numerals: Battery pack-100; Battery-10; Housing-11; Bottom surface-12; Explosion-proof valve-13; Heat exchanger-20; Heat exchange channel-21; Clearance hole-22; Wide part-23; Narrow part-24; Protrusion-241; First plate-251; Second plate-252; Recess-26; First recess-261; Second recess-262; Electrical equipment-200. Detailed Implementation

[0021] 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.

[0022] <Example Battery> Figure 3 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.

[0023] The battery 10 includes a casing 11 and a battery cell (not shown).

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In the current embodiment, the battery cell is rectangular in shape, and the housing 11 is a rectangular hard shell to accommodate the battery cell.

[0029] 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.

[0030] Continue to refer to Figure 3An explosion-proof valve 13 is provided at the bottom of the housing 11. The explosion-proof valve 13 is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of the battery 10 reaches a predetermined threshold. During the use of the battery 10, the explosion-proof valve 13 is mainly used to allow gas inside the battery 10 to be discharged in order to reduce the internal pressure of the battery 10 in order to prevent the battery from deforming or exploding due to excessive increase in internal pressure when thermal runaway or other situations occur.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] <Example Battery Pack> refer to Figure 1 and Figure 2 A battery pack 100 is shown. Exemplarily, the battery pack 100 serves as a power source for new energy vehicles, acting as a rechargeable battery. The battery pack 100 includes a battery group composed of multiple batteries 10 connected in series and / or parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. Exemplarily, the casing can be divided into upper and lower parts, which are sealed together.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped. It is understandable that the liquid cooling plate 20 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy. The liquid cooling plate 20 can also be made of nylon, plastic, etc.

[0043] In the current embodiment, reference Figure 1 and Figure 3 The bottom end face 12 of the housing 11 is provided with two explosion-proof valves 13, which are spaced apart in a first direction. Multiple batteries 10 are arranged along a second direction. The heat exchanger 20 includes a heat exchange channel 21 and multiple clearance holes 22. The heat exchange channel 21 extends along the second direction, and the multiple clearance holes 22 receive the explosion-proof valves 13 of the multiple batteries 10.

[0044] refer to Figure 4 The heat exchange channel 21 includes a wide portion 23 and a narrow portion 24. The narrow portion 24 is located between two of the plurality of clearance holes 22 in a first direction. The projection of the wide portion 23 along a second direction partially overlaps with the two clearance holes 22. Since the projection of the wide portion 23 along the second direction partially overlaps with the two clearance holes 22, and the narrow portion 24 is located between the two clearance holes 22 in the first direction, the size of the wide portion 23 in the first direction is larger than the size of the narrow portion 24 in the first direction. In this way, the wide portion 23 can occupy more space in the first direction, thereby increasing the contact area between the heat exchanger 20 and the bottom end surface 12 of the battery 10, thereby improving the heat exchange efficiency and ensuring the overall heat exchange effect of the heat exchanger 20.

[0045] refer to Figure 4 and Figure 5 In the first direction, the maximum dimension of the width portion 23 is L1 in mm, and the dimension of the housing 11 is W1 in mm, where 0.75 ≤ L1 / W1 ≤ 0.97. For example, L1 / W1 can be 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, 0.91, 0.93, 0.95, or 0.97.

[0046] If the ratio of the maximum dimension of the width portion 23 in the first direction to the dimension of the housing 11 in the first direction is too small, i.e., less than 0.75, the contact area between the width portion 23 and the bottom end surface 12 of the battery 10 will be small, which will reduce the heat exchange effect of the heat exchanger 20. If the ratio of the maximum dimension of the width portion 23 in the first direction to the dimension of the housing 11 in the first direction is too large, i.e., greater than 0.97, the width portion 23 will extend beyond the edge of the battery 10 in the first direction, which will result in a portion of the width portion 23 not contacting the bottom end surface 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchanger 20.

[0047] According to the battery pack 100 provided by this utility model, by limiting the ratio of the maximum dimension of the width portion 23 in the first direction to the dimension of the housing 11 in the first direction to the above-mentioned numerical range, it is possible to ensure the contact area between the width portion 23 and the bottom end surface 12 of the battery 10, and to ensure the heat exchange efficiency of the heat exchange element 20.

[0048] As one possible implementation, the width 23 has a dimension L1 in the first direction, in mm, where 140mm ≤ L1 ≤ 390mm. For example, L1 can be 140mm, 170mm, 200mm, 230mm, 260mm, 300mm, 330mm, 360mm, 380mm, or 390mm.

[0049] If the maximum dimension of the width portion 23 in the first direction is too small, i.e. less than 140 mm, the contact area between the width portion 23 and the bottom end surface 12 of the battery 10 will be small, which will reduce the heat exchange effect of the heat exchanger 20. If the maximum dimension of the width portion 23 in the first direction is too large, i.e. greater than 390 mm, the width portion 23 will extend beyond the edge of the battery 10 in the first direction, which will result in a portion of the width portion 23 not contacting the bottom end surface 12 of the battery 10, thus reducing the heat exchange efficiency of the heat exchanger 20.

[0050] According to the battery pack 100 provided by this utility model, by limiting the maximum size of the width portion 23 in the first direction to the above-mentioned numerical range, it is possible to ensure the contact area between the width portion 23 and the bottom end surface 12 of the battery 10, and to ensure the heat exchange efficiency of the heat exchange element 20.

[0051] As one possible implementation, the dimension of the housing 11 in the first direction is W1, in mm, where 145mm ≤ W1 ≤ 400mm. For example, W1 can be 145mm, 170mm, 195mm, 220mm, 250mm, 285mm, 320mm, 350mm, 375mm or 400mm.

[0052] If the size of the housing 11 in the first direction is too small, i.e. less than 145 mm, the size of the heat exchange channel 21 in the first direction will also 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 exchange element 20. If the size of the housing 11 in the first direction is too large, i.e. greater than 400 mm, it will be detrimental to the heat dissipation of the battery 10. Specifically, the central area of ​​the battery 10 in the first direction is farther from the heat dissipation surface, and heat is more likely to accumulate, thereby increasing the risk of local overheating of the battery pack 100.

[0053] According to the battery pack 100 provided by this utility model, the size of the housing 11 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 without increasing the risk of local overheating of the battery pack 100.

[0054] refer to Figure 4 and Figure 5 Along the first direction and away from the narrow portion 24, the size of the wide portion 23 gradually decreases in the second direction. When the heat exchange medium flows through the region of the wide portion 23 along the first direction and away from the narrow portion 24, the flow velocity tends to decrease due to the large cross-sectional area of ​​the flow channel in this region, thereby reducing the heat exchange efficiency. To address the above problem, the battery pack 100 provided by this utility model adopts a tapered design to reduce the difference in cross-sectional area between the wide portion 23 and the narrow portion 24, thereby effectively suppressing the stagnation of the heat exchange medium in the region of the wide portion 23 along the first direction and away from the narrow portion 24, thus ensuring the heat exchange effect.

[0055] refer to Figure 5 In the first direction, the distance from the clearance hole 22 to the narrow portion 24 is D1, in mm, and the dimension of the housing 11 is W1, in mm, where 0.02 ≤ D1 / W1 ≤ 0.08. For example, D1 / W1 can be 0.02, 0.025, 0.03, 0.035, 0.04, 0.05, 0.06, 0.065, 0.07, or 0.08.

[0056] If the ratio of the minimum distance from the clearance hole 22 to the heat exchange channel 21 along the first direction to the dimension of the shell 11 in the first direction is too small, i.e. less than 0.02, this will result in a smaller allowable error during processing and increased manufacturing difficulty. If the ratio of the minimum distance from the clearance hole 22 to the heat exchange channel 21 along the first direction to the dimension of the shell 11 in the first direction is too large, i.e. greater than 0.08, then the distance between the heat exchange channel 21 and the clearance hole 22 in the first direction is large. In this case, the arrangement space reserved for the narrow portion 24 by the two clearance holes 22 in the first direction is not fully utilized, resulting in low space utilization.

[0057] 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 along the first direction to the size of the battery 10 in the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the narrow portion 24 by the two clearance holes 22 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0058] As one possible implementation, in the first direction, the minimum distance from the clearance hole 22 to the heat exchange channel 21 is D1, in mm, where 6 mm ≤ D1 ≤ 30 mm. For example, D1 can be 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 23 mm, 26 mm, or 30 mm.

[0059] If the minimum distance from the clearance hole 22 to the heat exchange channel 21 along the first direction is too small, i.e. less than 6 mm, this will result in a smaller allowable error during processing and increased manufacturing difficulty. If the minimum distance from the clearance hole 22 to the heat exchange channel 21 along the first direction is too large, i.e. greater than 30 mm, the distance between the heat exchange channel 21 and the clearance hole 22 in the first direction will be large. In this case, the arrangement space reserved for the narrow portion 24 by the two clearance holes 22 in the first direction will not be fully utilized, resulting in low space utilization.

[0060] According to the battery pack 100 provided by this utility model, the minimum distance from the clearance hole 22 to the heat exchange channel 21 along the first direction is limited to the above-mentioned numerical range. This ensures that the arrangement space reserved for the narrow portion 24 by the two clearance holes 22 in the second direction is fully utilized, without excessively increasing the manufacturing difficulty of the heat exchange component 20.

[0061] refer to Figure 6 The heat exchange channel 21 includes a first plate portion 251 and a second plate portion 252 spaced apart in the vertical direction. The first plate portion 251 is closer to the bottom end face 12 than the second plate portion 252. The second plate portion 252 includes a plurality of recesses 26 that protrude from the second plate portion 252 toward the first plate portion 251. According to the battery pack 100 provided by the present invention, by constructing a plurality of recesses 26 on the second plate portion 252, the structural stability of the entire heat exchange channel 21 can be enhanced, thereby improving the mechanical strength and compressive strength of the heat exchange component 20 and preventing the heat exchange channel 21 from deforming due to pressure.

[0062] It is understood that the present invention does not impose any particular restrictions on the shape of the recess 26. For example, the shape of the recess 26 can be one of a circle, an ellipse, and a racetrack shape.

[0063] refer to Figure 4 The plurality of recesses 26 include two first recesses 261 spaced apart along a first direction, and the two first recesses 261 extend from the narrow portion 24 to the wide portion 23 along a second direction. Due to the presence of the two first recesses 261, the heat exchange channel 21 is divided into three sub-channels in the first direction. Compared with the undivided heat exchange channel 21, the dimensions of the divided sub-channels in the first direction are all reduced. As a result, the flow velocity of the fluid medium in the three sub-channels will increase, thereby improving the heat exchange efficiency of the heat exchanger 20.

[0064] refer to Figures 4 to 6 In the first direction, the distance between the two first recesses 261 is L2, in mm, and the minimum distance from the first recess 261 to the edge of the narrow portion 24 is L3, in mm, where L2 ≥ L3.

[0065] If the distance between the two first recesses 261 in the first direction is less than the minimum distance from the first recess 261 to the edge of the narrow portion 24 along the first direction, the flow resistance of the sub-channel between the two first recesses 261 in the heat exchange channel 21 will be large. This may cause the heat exchange medium to bypass the sub-channel between the two first recesses 261 when flowing in the sub-channel between the two first recesses 261, and flow to the sub-channel between the edge of the first recess 261 and the narrow portion 24. This will reduce the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10 and affect the heat exchange effect.

[0066] The battery pack 100 provided by this utility model ensures that the heat exchange medium flows through the sub-channel between the two first recesses 261 when it flows in the heat exchange channel 21, by setting the distance between the two first recesses 261 in the first direction to be greater than or equal to the minimum distance from the first recesses 261 to the edge of the narrow portion 24 in the first direction. This ensures the effective heat exchange area of ​​the heat exchange channel 21.

[0067] refer to Figure 4 In the first direction, the distance between the two first recesses 261 is L2, in mm, and the minimum distance from the first recess 261 to the narrow portion 24 is L3, in mm, where 1 ≤ L2 / L3 ≤ 2. For example, L2 / L3 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 2.

[0068] If the ratio of the distance between the two first recesses 261 in the first direction to the minimum distance from the first recess 261 to the edge of the narrow portion 24 in the first direction is too small, i.e., less than 1, this may cause the heat exchange medium to bypass the sub-channel between the two first recesses 261 when flowing in the heat exchange channel 21, and instead flow to the sub-channel between the edge of the first recess 261 and the narrow portion 24. This will reduce the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, affecting the heat exchange effect. If the ratio of the distance between the two first recesses 261 in the first direction to the minimum distance from the first recess 261 to the edge of the narrow portion 24 in the first direction is too large, i.e., greater than 2, then the minimum distance from the first recess 261 to the edge of the narrow portion 24 in the first direction is small. This will increase the flow resistance of the sub-channel between the edge of the first recess 261 and the narrow portion 24, thereby reducing the flow rate of the heat exchange medium through the sub-channel between the edge of the first recess 261 and the narrow portion 24 when flowing in the heat exchange channel 21.

[0069] The battery pack 100 provided by this utility model limits the ratio of the distance between the two first recesses 261 in the first direction to the minimum distance from the first recesses 261 to the edge of the narrow portion 24 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the three separated sub-channels when it flows in the heat exchange channel 21.

[0070] As one possible implementation, the distance between the two first recesses 261 in the first direction is L2, in mm, where 10mm ≤ L2 ≤ 40mm. For example, L2 can be 10mm, 13mm, 16mm, 19mm, 22mm, 25mm, 28mm, 32mm, 36mm or 40mm.

[0071] If the distance between the two first recesses 261 in the first direction is too small, i.e. less than 10 mm, this may cause the heat exchange medium to bypass the sub-channel between the two first recesses 261 when flowing in the heat exchange channel 21, and instead flow to the sub-channel between the edge of the first recess 261 and the narrow portion 24. This will reduce the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, affecting the heat exchange effect. If the distance between the two first recesses 261 in the first direction is too large, i.e. greater than 40 mm, the minimum distance from the first recess 261 to the edge of the narrow portion 24 along the first direction is small. This will increase the flow resistance of the sub-channel between the edge of the first recess 261 and the narrow portion 24, thereby reducing the flow rate of the heat exchange medium through the sub-channel between the edge of the first recess 261 and the narrow portion 24 when flowing in the heat exchange channel 21.

[0072] The battery pack 100 provided by this utility model limits the distance between the two first recesses 261 in the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the three separated sub-channels when it flows in the heat exchange channel 21.

[0073] As one possible implementation, in the first direction, the minimum distance from the first recess 261 to the narrow portion 24 is L3, in mm, where 6 mm ≤ L3 ≤ 25 mm. For example, L3 can be 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, or 25 mm.

[0074] If the minimum distance from the first recess 261 to the edge of the narrow portion 24 along the first direction is too small, i.e. less than 6 mm, this will increase the flow resistance of the sub-channel between the edge of the first recess 261 and the narrow portion 24, thereby reducing the flow rate of the heat exchange medium through the sub-channel between the edge of the first recess 261 and the narrow portion 24 when flowing in the heat exchange channel 21. If the minimum distance from the first recess 261 to the edge of the narrow portion 24 along the first direction is too large, i.e. greater than 25 mm, this may cause the heat exchange medium to bypass the sub-channel between the two first recesses 261 when flowing in the heat exchange channel 21, and flow to the sub-channel between the edge of the first recess 261 and the narrow portion 24. This will reduce the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, affecting the heat exchange effect.

[0075] The battery pack 100 provided by this utility model limits the minimum distance from the first recess 261 to the edge of the narrow portion 24 along the first direction to the above-mentioned numerical range, which can take into account the flow rate of the heat exchange medium through the three separated sub-channels when it flows in the heat exchange channel 21.

[0076] refer to Figures 4 to 6The plurality of recesses 26 include a plurality of second recesses 262, and the projections of two of the second recesses 262 in the vertical direction overlap with the projections of the width portion 23 in the vertical direction. When the dimensions of the width portion 23 and the narrow portion 24 of the heat exchange 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 second recesses 262 on the width portion 23, which can reduce the flow area of ​​the width portion 23, reduce the degree of abrupt change in the flow area of ​​the heat exchange medium in the flow path, and thus enable the heat exchange medium to flow smoothly.

[0077] refer to Figure 4 and Figure 5 The minimum distance from the edge of the second recess 262 to the edge of the wide portion 23 is D2, in mm, and the minimum distance from the first recess 261 to the narrow portion 24 is L3, in mm, where 0.4 ≤ D2 / L3 ≤ 1.5. For example, D2 / L3 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.3, or 1.5.

[0078] If the ratio of the minimum distance from the edge of the second recess 262 to the edge of the wide portion 23 to the minimum distance from the first recess 261 to the narrow portion 24 is too small (less than 0.4), the minimum distance from the edge of the second recess 262 to the edge of the wide portion 23 is small. This makes it easy for vortices to form in the transition area of ​​the fluid medium from the narrow portion 24 to the wide portion 23, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. Conversely, if the ratio of the minimum distance from the edge of the second recess 262 to the edge of the wide portion 23 to the minimum distance from the first recess 261 to the narrow portion 24 is too large (greater than 1.5), the minimum distance from the first recess 261 to the narrow portion 24 is small. This results in a smaller heat exchange area between the narrow portion 24 and the bottom surface 12 of the battery 10, leading to poor heat exchange performance of the heat exchanger 20.

[0079] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the edge of the second recess 262 to the wide portion 23 to the minimum distance from the first recess 261 to the narrow portion 24 is limited to the above-mentioned numerical range. This can make the flow velocity distribution of the heat exchange medium in the transition area from the narrow portion 24 to the wide portion 23 more uniform, and can also ensure the heat exchange area between the narrow portion 24 and the bottom end surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0080] As one possible implementation, the minimum distance from the second recess 262 to the edge of the width 23 is D2, in mm, where 8 mm ≤ D2 ≤ 25 mm. For example, D2 can be 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 21 mm, 23 mm, or 25 mm.

[0081] If the minimum distance between the second recess 262 and the edge of the wide portion 23 is too small, i.e., less than 8 mm, vortices are easily formed in the area where the fluid medium transitions from the narrow portion 24 to the wide portion 23, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. If the minimum distance between the second recess 262 and the edge of the wide portion 23 is too large, i.e., greater than 25 mm, the size of the second recess 262 in the first direction will be compressed, causing uneven velocity distribution of the heat exchange medium as it flows from the narrow portion 24 to the wide portion 23.

[0082] According to the battery pack 100 provided by this utility model, the minimum distance from the edge of the second recess 262 to the wide portion 23 is limited to the above-mentioned numerical range. This not only makes the flow velocity distribution of the heat exchange medium in the transition area from the narrow portion 24 to the wide portion 23 more uniform, but also reduces the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly.

[0083] refer to Figure 4 and Figure 5 The minimum distance from the second recess 262 to the first recess 261 is D3, in mm, and the minimum distance from the first recess 261 to the narrow portion 24 is L3, in mm, where 0.4 ≤ D3 / L3 ≤ 1.5. For example, D3 / 3 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.3, or 1.5.

[0084] If the ratio of the minimum distance from the second recess 262 to the first recess 261 to the minimum distance from the first recess 261 to the narrow portion 24 is too small (less than 0.4), the minimum distance from the second recess 262 to the first recess 261 is small. This makes it easy for vortices to form in the area where the fluid medium transitions from the narrow portion 24 to the wide portion 23, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. Conversely, if the ratio of the minimum distance from the second recess 262 to the first recess 261 to the minimum distance from the first recess 261 to the narrow portion 24 is too large (greater than 1.5), the minimum distance from the first recess 261 to the narrow portion 24 is small. This results in a smaller heat exchange area between the narrow portion 24 and the bottom surface 12 of the battery 10, leading to poor heat exchange performance of the heat exchanger 20.

[0085] According to the battery pack 100 provided by this utility model, the ratio of the minimum distance from the second recess 262 to the first recess 261 to the minimum distance from the first recess 261 to the narrow portion 24 is limited to the above-mentioned numerical range. This can make the flow velocity distribution of the heat exchange medium in the area where the narrow portion 24 transitions to the wide portion 23 more uniform, and can also ensure the heat exchange area between the narrow portion 24 and the bottom end surface 12 of the battery 10, thereby ensuring the heat exchange effect of the heat exchange element 20.

[0086] As one possible implementation, the minimum distance between the second recess 262 and the first recess 261 is D3, in mm, where 8 mm ≤ D3 ≤ 25 mm. For example, D3 can be 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 21 mm, 23 mm, or 25 mm.

[0087] If the minimum distance between the second recess 262 and the first recess 261 is too small, i.e., less than 8 mm, vortices are easily formed in the area where the fluid medium transitions from the narrow portion 24 to the wide portion 23, resulting in uneven velocity distribution of the heat exchange medium and low overall heat exchange efficiency of the heat exchanger 20. If the minimum distance between the second recess 262 and the first recess 261 is too large, i.e., greater than 25 mm, the size of the second recess 262 in the first direction will be compressed, causing uneven velocity distribution of the heat exchange medium as it flows from the narrow portion 24 to the wide portion 23.

[0088] According to the battery pack 100 provided by this utility model, the minimum distance between the second recess 262 and the first recess 261 is limited to the above-mentioned numerical range, which can make the flow velocity distribution of the heat exchange medium in the transition area from the narrow part 24 to the wide part 23 more uniform, and can also reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly.

[0089] refer to Figure 4 and Figure 7 The second plate portion 252 of the narrow portion 24 includes a plurality of protrusions 241. Each protrusion 241 rises from the side of the second plate portion 252 away from it along a first direction. Two protrusions 241 are spaced apart along the first direction, and the two protrusions 241 are located on either side of the two first recesses 261 in the first direction. The battery pack 100 provided by this invention has a plurality of protrusions 241 on the wide portion 23, which increases the flow area of ​​the narrow portion 24 and reduces the abrupt change in the flow area of ​​the heat exchange medium along the flow path, thereby enabling the heat exchange medium to flow smoothly.

[0090] refer to Figure 6 and Figure 7 In the vertical direction, the size of the protrusion 241 is H1 in mm, and the maximum size of the width 23 is H2 in mm, with 0.6 ≤ H1 / H2 ≤ 2. For example, H1 / H2 can be 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.4, 1.5, 1.7 or 2.

[0091] If the ratio of the vertical dimension of the protrusion 241 to the maximum vertical dimension of the width 23 is too small (less than 0.6), the flow area of ​​the heat exchange medium when flowing through the narrow section 24 will be small. This will result in a large difference in the flow area of ​​the heat exchange medium when flowing through the width 23 and the narrow section 24, leading to uneven velocity distribution of the heat exchange medium. If the ratio of the vertical dimension of the protrusion 241 to the maximum vertical dimension of the width 23 is too large (greater than 2), the narrow section 24 will occupy more space in the vertical direction, which is detrimental to the space utilization of the battery pack 100.

[0092] According to the battery pack 100 provided by this utility model, the ratio of the vertical dimension of the protrusion 241 to the maximum vertical dimension of the width 23 is limited to the above-mentioned numerical range. This can reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly, and also limit the vertical dimension of the heat exchange component 20, ensuring the space utilization rate of the battery pack 100.

[0093] As one possible implementation, the size of the protrusion 241 in the vertical direction is H1, in mm, where 3 mm ≤ H1 ≤ 10 mm. For example, H1 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, or 10 mm.

[0094] If the vertical dimension of the protrusion 241 is too small, i.e., less than 3 mm, the flow area of ​​the heat exchange medium when flowing through the narrow section 24 will be small. This will result in a large difference in the flow area of ​​the heat exchange medium when flowing through the wide section 23 and the narrow section 24, leading to uneven velocity distribution of the heat exchange medium. If the vertical dimension of the protrusion 241 is too large, i.e., greater than 10 mm, the narrow section 24 will occupy more space in the vertical direction, which is not conducive to the space utilization of the battery pack 100.

[0095] According to the battery pack 100 provided by this utility model, the size of the protrusion 241 in the vertical direction is limited to the above-mentioned numerical range, which can reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, so that the heat exchange medium can flow smoothly, and also limit the size of the heat exchange component 20 in the vertical direction, ensuring the space utilization rate of the battery pack 100.

[0096] As one possible implementation, the maximum dimension of the width 23 in the vertical direction is H2, in mm, where 2mm ≤ H2 ≤ 5 mm. For example, H2 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.2mm, 3.5mm, 3.8mm, 4.2mm, or 5mm.

[0097] If the maximum vertical dimension of the width portion 23 is too small, i.e. less than 2 mm, the flow area of ​​the heat exchange medium when flowing through the width portion 23 will be small, which will reduce the heat exchange efficiency. If the maximum vertical dimension of the width portion 23 is too large, i.e. greater than 5 mm, this will result in a large difference in the flow area of ​​the heat exchange medium when passing through the width portion 23 and the narrow portion 24, thus leading to uneven velocity distribution of the heat exchange medium.

[0098] According to the battery pack 100 provided by this utility model, the maximum size of the wide portion 23 in the vertical direction is limited to the above-mentioned numerical range, which can reduce the abrupt change in the flow area of ​​the heat exchange medium in the flow path, thereby enabling the heat exchange medium to flow smoothly, and also ensure the heat exchange efficiency when the heat exchange medium flows through the wide portion 23.

[0099] refer to Figure 1 and Figure 2 The plurality of batteries 10 includes two rows of batteries 10 spaced apart along a first direction. In the first direction, the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 is D4 in mm. The size of the battery 10 is W1 in mm, and 0.03 ≤ D4 / W1 ≤ 0.1. For example, D4 / W1 can be 0.03, 0.035, 0.04, 0.045, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1.

[0100] If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too small, i.e., less than 0.03, then after the explosion-proof valve 13 of one battery 10 is actuated, the gas released from the housing 11 may impact the explosion-proof valve 13 of the other battery 10, causing it to be actuated unexpectedly. If the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the dimension of the battery 10 in the first direction is too large, i.e., greater than 0.1, then the arrangement space of the heat exchange channel 21 in the first direction will be compressed, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0101] The battery pack 100 provided by this utility model limits the ratio of the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the size of the battery 10 in the first direction to the above-mentioned numerical range. This can ensure the arrangement space of the heat exchange channel 21 in the first direction and effectively reduce the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when one of them bursts, thereby improving the safety of the battery pack 100.

[0102] As one possible implementation, in the first direction, the minimum distance between the explosion-proof valves of two adjacent batteries is D4, in mm, where 11 mm ≤ D4 ≤ 42 mm. For example, D4 ​​can be 11 mm, 14 mm, 17 mm, 20 mm, 23 mm, 26 mm, 30 mm, 34 mm, 38 mm, or 42 mm.

[0103] If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too small, i.e., less than 11 mm, the gas released from the housing 11 after the explosion-proof valve 13 of one battery 10 is activated may impact the explosion-proof valve 13 of the other battery 10, causing it to be activated unexpectedly. If the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction is too large, i.e., greater than 42 mm, it will compress the arrangement space of the heat exchange channel 21 in the first direction, thereby reducing the contact area between the heat exchange channel 21 and the bottom end face 12 of the battery 10, which is not conducive to the heat exchange effect of the heat exchange element 20.

[0104] The battery pack 100 provided by this utility model limits the minimum distance between the explosion-proof valves 13 of two adjacent batteries 10 in the first direction to the above-mentioned numerical range. This not only ensures the arrangement space of the heat exchange channel 21 in the first direction, but also effectively reduces the impact of one explosion-proof valve 13 on the other explosion-proof valve 13 when it bursts, thereby improving the safety of the battery pack 100.

[0105] <Example Electrical Equipment> 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 plate portion and the second plate portion), these elements are not defined by these terms, which are only used to distinguish one element from another.

[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) including a housing (11), the bottom end face (12) of the housing (11) being provided with two explosion-proof valves (13), the two explosion-proof valves (13) being spaced apart in a first direction, the multiple batteries (10) being arranged along a second direction; and The heat exchanger (20) includes a heat exchange channel (21) and a plurality of clearance holes (22). The heat exchange channel (21) extends along a second direction. The plurality of clearance holes (22) receive the explosion-proof valves (13) of the plurality of batteries (10). The vertical direction, the first direction, and the second direction are perpendicular to each other. The heat exchange channel (21) includes a wide portion (23) and a narrow portion (24). The narrow portion (24) is located between two clearance holes (22) of the plurality of clearance holes (22) in the first direction. The projection of the wide portion (23) along the second direction partially overlaps with the two clearance holes (22). In the first direction, the maximum dimension of the wide portion (23) is L1 in mm. The dimension of the housing (11) is W1 in mm, and 0.75≤L1 / W1≤0.

97.

2. The battery pack (100) according to claim 1, characterized in that, The maximum dimension of the width portion (23) in the first direction is L1, in mm, where 140mm≤L1≤390mm.

3. The battery pack (100) according to claim 1, characterized in that, In the first direction, the size of the housing (11) is W1 in mm, where 145 mm ≤ W1 ≤ 400 mm.

4. The battery pack (100) according to claim 1, characterized in that, Along the first direction and away from the narrow portion (24), the size of the wide portion (23) gradually decreases in the second direction.

5. The battery pack (100) according to claim 3, characterized in that, In the first direction, the distance from the clearance hole (22) to the narrow portion (24) is D1 in mm, and the size of the housing (11) is W1 in mm, 0.02≤D1 / W1≤0.

08.

6. The battery pack (100) according to claim 5, characterized in that, In the first direction, the minimum distance from the clearance hole (22) to the heat exchange channel (21) is D1, in mm, where 6 mm ≤ D1 ≤ 30 mm.

7. The battery pack (100) according to claim 1, characterized in that, The heat exchange channel (21) includes a first plate portion (251) and a second plate portion (252) spaced apart in the vertical direction. The first plate portion (251) is closer to the bottom end face (12) than the second plate portion (252). The second plate portion (252) includes a plurality of recesses (26) that protrude from the second plate portion (252) toward the first plate portion (251).

8. The battery pack (100) according to claim 7, characterized in that, The plurality of recesses (26) include two first recesses (261) spaced apart along the first direction, the two first recesses (261) extending from the narrow portion (24) toward the wide portion (23) along the second direction.

9. The battery pack (100) according to claim 8, characterized in that, In the first direction, the distance between the two first recesses (261) is L2 in mm, and the minimum distance from the first recess (261) to the edge of the narrow portion (24) is L3 in mm, where L2 ≥ L3.

10. The battery pack (100) according to claim 9, characterized in that, In the first direction, the distance between the two first recesses (261) is L2 in mm, and the minimum distance from the first recess (261) to the edge of the narrow portion (24) is L3 in mm, where 1 ≤ L2 / L3 ≤ 2.

11. The battery pack (100) according to claim 10, characterized in that, In the first direction, the distance between the two first recesses (261) is L2, in mm, where 10mm≤L2≤40mm.

12. The battery pack (100) according to claim 10, characterized in that, In the first direction, the minimum distance from the first recess (261) to the edge of the narrow portion (24) is L3, in mm, where 6mm≤L3≤25mm.

13. The battery pack (100) according to claim 8, characterized in that, The plurality of recesses (26) include a plurality of second recesses (262), and the projection of two of the plurality of second recesses (262) along the vertical direction overlaps with the projection of the width portion (23) along the vertical direction.

14. The battery pack (100) according to claim 13, characterized in that, The minimum distance from the second recess (262) to the edge of the wide portion (23) is D2, in mm, and the minimum distance from the first recess (261) to the edge of the narrow portion (24) is L3, in mm, 0.4≤D2 / L3≤1.

5.

15. The battery pack (100) according to claim 14, characterized in that, The minimum distance from the second recess (262) to the edge of the wide portion (23) is D2, in mm, where 8 mm ≤ D2 ≤ 25 mm.

16. The battery pack (100) according to claim 13, characterized in that, The minimum distance from the second recess (262) to the first recess (261) is D3, in mm, and the minimum distance from the first recess (261) to the edge of the narrow portion (24) is L3, in mm, 0.4≤D3 / L3≤1.

5.

17. The battery pack (100) according to claim 16, characterized in that, The minimum distance between the second recess (262) and the first recess (261) is D3, in mm, where 8mm≤D3≤25mm.

18. The battery pack (100) according to claim 8, characterized in that, The second plate portion (252) of the narrow portion (24) includes a plurality of protrusions (241), the protrusions (241) rising from the side of the second plate portion (252) away from the second plate portion (252) along the first direction, two protrusions (241) of the plurality of protrusions (241) being spaced apart along the first direction, the two protrusions (241) being located on both sides of the two first recesses (261) in the first direction.

19. The battery pack (100) according to claim 18, characterized in that, In the vertical direction, the size of the protrusion (241) is H1 in mm, and the maximum size of the width (23) is H2 in mm, 0.6≤H1 / H2≤2.

20. The battery pack (100) according to claim 18, characterized in that, In the vertical direction, the size of the protrusion (241) is H1, in mm, where 3mm≤H1≤10mm.

21. The battery pack (100) according to claim 18, characterized in that, In the vertical direction, the maximum dimension of the width (23) is H2, in mm, where 2mm≤H2≤5mm.

22. The battery pack (100) according to claim 1, characterized in that, The plurality of batteries (10) includes two rows of batteries (10) spaced apart along the first direction. In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4 in mm. The size of the housing (11) is W1 in mm, and 0.03≤D4 / W1≤0.

1.

23. The battery pack (100) according to claim 22, characterized in that, In the first direction, the minimum distance between the explosion-proof valves (13) of two adjacent batteries (10) is D4, in mm, where 11 mm ≤ D4 ≤ 42 mm.

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

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