Battery pack and electric device with same

Abstract

The utility model relates to battery technology field provides a kind of battery pack and the electric equipment with it. Battery pack includes multiple batteries, box and heat exchange plate. Box houses multiple batteries. Heat exchange plate includes multiple liquid inlet channels extending along the first direction and at least one liquid return channel, at least one liquid return channel is located on one side of multiple liquid inlet channels in the second direction, heat exchange medium flows from multiple liquid inlet channels to at least one liquid return channel, the projection of multiple batteries along the height direction covers the projection of multiple liquid inlet channels along the height direction, the first direction, the second direction and the height direction are perpendicular to each other, the flow direction of heat exchange medium in liquid inlet channel is opposite to its flow direction in liquid return channel. This not only can shorten the process length of heat exchange medium in liquid inlet channel, avoid heat exchange medium and multiple batteries repeatedly heat exchange, also can reduce high-temperature heat exchange medium and battery heat exchange, avoid heat exchange medium to return heat to battery, ensure the heat exchange efficiency of heat exchange plate.

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] The development of technologies such as electric vehicles and large-scale energy storage has placed higher demands on the energy density, power density, and cycle life of battery systems. Batteries continuously generate heat during charging and discharging; if this heat cannot be dissipated in a timely and effective manner, the battery temperature will rise. Excessively high temperatures can accelerate battery aging and even trigger serious safety issues such as thermal runaway.

[0003] To address this, related technologies incorporate a heat exchange structure on one side of the battery. This structure features channels for the flow of a heat exchange medium, which exchanges heat with the battery to remove it. However, the heat exchange medium, having absorbed heat and increased in temperature, will still come into contact with other batteries in subsequent channels. This portion of the high-temperature heat exchange medium not only fails to provide effective cooling but may also transfer heat back to the cooler batteries, ultimately weakening the actual heat exchange efficiency of the structure. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and an electrical device having the same, with the aim of improving the heat exchange efficiency of the heat exchange structure.

[0005] In a first aspect, the battery pack provided by this utility model includes multiple batteries, a housing, and a heat exchange plate. The housing houses multiple batteries. The heat exchange plate includes multiple inlet channels extending along a first direction and at least one return channel. The at least one return channel is located on one side of the multiple inlet channels in a second direction. The heat exchange medium flows from the multiple inlet channels to the at least one return channel. The projections of the multiple batteries along the height direction cover the projections of the multiple inlet channels along the height direction. The first direction, the second direction, and the height direction are perpendicular to each other. The flow direction of the heat exchange medium in the inlet channels is opposite to its flow direction in the return channel.

[0006] Secondly, the electrical equipment provided by this utility model includes the battery pack of the first aspect.

[0007] The beneficial effects of the battery pack provided in this embodiment of the present invention are as follows: Because the heat exchange medium flows unidirectionally in the first direction within the inlet channel, its flow path length within the channel is shortened. This avoids repeated heat exchange between the heat exchange medium and multiple batteries over a longer flow path. Specifically, this approach prevents the heat exchange medium from transferring absorbed heat to downstream batteries after exchanging heat with upstream batteries, thereby reducing the risk of battery thermal runaway. Furthermore, since the heat exchange medium in the return channel is at a higher temperature, arranging the return channel on one side of the multiple inlet channels in the second direction minimizes heat exchange between the high-temperature heat exchange medium and the batteries, preventing the heat exchange medium from transferring heat back to the batteries and ensuring the heat exchange efficiency of the heat exchange plate. 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 a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 An exploded view of the battery pack.

[0014] Figure 3 yes Figure 2 A schematic diagram of the battery structure in the battery pack.

[0015] Figure 4 yes Figure 1 A cross-sectional view of the battery pack.

[0016] Figure 5 yes Figure 4 An enlarged view of a portion of the battery pack.

[0017] Figure 6 yes Figure 4 A schematic diagram of a portion of the battery pack.

[0018] Figure 7 Yes, yes Figure 1 A top view of a portion of the battery pack.

[0019] Figure 8 yes Figure 1 A cross-sectional view of a portion of the battery pack.

[0020] Figure 9 yes Figure 1 A cross-sectional view of a portion of the battery pack.

[0021] Figure 10 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached drawings: Battery pack - 100; Battery - 10; Housing - 20; First housing plate - 21; Second housing plate - 22; Partition beam - 23; First receiving part - 201; Second receiving part - 202; Heat exchange plate - 30; Liquid inlet - 301; Liquid outlet - 302; Liquid inlet channel - 31; Liquid return channel - 32; Collector - 33; Liquid inlet chamber - 331; First chamber - 3311; Second chamber - 3312; Liquid return chamber - 332; Longitudinal partition - 333; Connecting hole - 334; Transverse partition - 335; Flow equalization hole - 336; Merging chamber - 34; Liquid inlet pipe - 41; Liquid inlet channel - 411; Liquid return pipe - 42; Liquid return channel - 421; Electrical components - 50; Electrical equipment - 200. Detailed Implementation

[0023] 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.

[0024] <Example Battery> Figure 3 A battery 10 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 10, the active materials can be activated by charging after discharge so that it can continue to be used.

[0025] It is understood that in this embodiment of the present disclosure, battery 10 refers to an energy storage device that can be repeatedly charged and discharged. Battery 10 can be lithium-ion battery 10, sodium-ion battery 10, nickel-metal hydride battery 10, etc.

[0026] refer to Figure 3 The battery 10 includes a casing 11 and a cell (not shown).

[0027] The housing 11 provides a receiving space to house the battery cell and isolate it from the outside environment. The housing 11 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.

[0028] For example, the material of the housing 11 may be one of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and aluminum-plastic film, and this disclosure does not impose any particular limitation on it.

[0029] 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.

[0030] 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.

[0031] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment includes a plurality of batteries 10 and a housing 20. The housing 20 accommodates the plurality of batteries 10.

[0032] 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 localized overheating, resulting in safety hazards such as thermal runaway.

[0033] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 2 The battery pack 100 also includes a heat exchange plate 30, which is used to thermally couple with the battery 10 to regulate the temperature of the battery 10.

[0034] As one possible implementation, a heat exchange medium can be stored within the heat exchange plate 30, and cooling of the battery 10 can be achieved through a phase change of the heat exchange medium. It is understood that the heat exchange medium can be a gas, solid, or liquid; for example, the heat exchange medium can be a coolant.

[0035] As an example, the heat exchange plate 30 can be a liquid-cooled plate 30, which has liquid-cooled flow channels within it. (Reference) Figure 4The liquid cooling plate 30 also includes a liquid inlet 301 and a liquid outlet 302, both of which are connected to the collector 33 for the inlet and outlet of the heat exchange medium. The liquid cooling plate 30 can be made of a material with a certain hardness and strength (such as stainless steel), so that the liquid cooling plate 30 is not easily deformed when the battery 10 is subjected to compression and impact, which can enable the battery 10 to have higher structural strength and improve safety performance.

[0036] It is understandable that the liquid cooling plate 30 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy. The liquid cooling plate 30 can also be made of nylon, plastic, etc.

[0037] refer to Figure 2 and Figure 4 In the current embodiment, the heat exchange plate 30 includes a plurality of liquid inlet channels 31 and at least one liquid return channel 32 extending along a first direction. The plurality of liquid inlet channels 31 are located at the bottom of the plurality of batteries 10 and exchange heat with the plurality of batteries 10. The at least one liquid return channel 32 is located on one side of the plurality of liquid inlet channels 31 in a second direction. The heat exchange medium flows from the plurality of liquid inlet channels 31 to the at least one liquid return channel 32, and its flow direction in the plurality of liquid inlet channels 31 and the at least one liquid return channel 32 is opposite. The projection of the plurality of batteries 10 along the height direction covers the projection of the plurality of liquid inlet channels 31 along the height direction. The flow direction of the heat exchange medium in the liquid inlet channels 31 is opposite to its flow direction in the liquid return channel 32.

[0038] Since the heat exchange medium flows unidirectionally in the first direction within the inlet channel 31, its flow length within the channel is shortened. This avoids repeated heat exchange between the heat exchange medium and multiple batteries 10 over a longer flow path. Specifically, this prevents the heat exchange medium from transferring absorbed heat to downstream batteries 10 after exchanging heat with upstream batteries 10, thereby reducing the risk of thermal runaway of the batteries 10. Furthermore, because the temperature of the heat exchange medium in the return channel 32 is higher, arranging the return channel 32 on one side of the multiple inlet channels 31 in the second direction minimizes heat exchange between the high-temperature heat exchange medium and the batteries 10, preventing the heat exchange medium from transferring heat back to the batteries 10, thus ensuring the heat exchange efficiency of the heat exchange plate 30.

[0039] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- are used to indicate opposite sides in the height direction; arrows X+ and X- are used to indicate opposite sides in the first direction; and arrows Y+ and Y- are used to indicate opposite sides in the second direction. The height direction, the first direction, and the second direction are perpendicular to each other.

[0040] It should be noted that, in the above text, "upstream" refers to the portion of the heat exchange medium closer to the inlet 301 in the flow path of the heat exchange plate 30, and "downstream" refers to the portion of the heat exchange medium closer to the outlet 302 in the flow path of the heat exchange plate 30. As an example, the upstream portion of the heat exchange medium in the flow path of the inlet channel 31 is closer to the direction indicated by arrow X+, and the downstream portion of the heat exchange medium in the flow path of the inlet channel 31 is closer to the direction indicated by arrow X-.

[0041] refer to Figure 4 The heat exchange plate 30 includes a manifold 33, which includes a liquid inlet chamber 331 and a liquid return chamber 332 separated from each other. The liquid inlet chamber 331 communicates with the liquid inlet channel 31, and the liquid return chamber 332 communicates with the liquid return channel 32. In a first direction, the liquid inlet chamber 331 is located between the liquid return chamber 332 and the plurality of liquid inlet channels 31. Since the liquid inlet chamber 331 is closer to the plurality of liquid inlet channels 31, the path of the heat exchange medium from the liquid inlet chamber 331 into the liquid inlet channel 31 is shorter and the resistance is lower, which helps to improve the flow efficiency of the heat exchange medium in the heat exchange plate 30. Furthermore, the dimensions of the liquid inlet chamber 331 in the second direction can be configured to be similar to the dimensions of the multiple liquid inlet channels 31. This not only optimizes space utilization and makes the structure of the heat exchange plate 30 more compact, but also reduces the flow distribution difference of the heat exchange medium from the liquid inlet chamber 331 to each liquid inlet channel 31, ensuring that the heat exchange medium can enter the liquid inlet channel 31 smoothly and uniformly, thus guaranteeing the heat exchange efficiency of the heat exchange plate 30.

[0042] refer to Figure 4 and Figure 5 The liquid inlet chamber 331 includes multiple first cavities 3311, which are spaced apart along a second direction. Each first cavity 3311 communicates with at least two of the multiple liquid inlet channels 31. By setting multiple first cavities 3311 spaced apart along the second direction and connecting each first cavity 3311 to at least two liquid inlet channels 31, multiple parallel and independent distribution units can be constructed. This implementation can ensure the consistency of flow rate among the liquid inlet channels 31, ultimately ensuring that multiple batteries 10 can obtain a highly uniform heat exchange effect, effectively eliminating local hot spots, and improving the efficiency and reliability of the heat exchange plate 30.

[0043] refer to Figure 5 The liquid inlet chamber 331 includes a second chamber 3312 extending along a second direction, and multiple first chambers 3311 communicating with the second chamber 3312 and multiple liquid inlet channels 31 respectively in a first direction. When the heat exchange medium enters the liquid inlet chamber 331, it first flows into the second chamber 3312, and is then evenly distributed to each of the first chambers 3311, and then further distributed by each first chamber 3311 to its corresponding liquid inlet channel 31. This implementation method can ensure the balanced flow of the heat exchange medium, which helps to improve the uniformity and stability of the heat exchange medium distribution.

[0044] Continue to refer to Figure 5 The manifold 33 includes multiple longitudinal partitions 333, which are spaced apart along a second direction. A connecting hole 334 is formed between adjacent partitions 333. Each connecting hole 334 connects a second cavity 3312 and a corresponding first cavity 3311. In the second direction, the size of the first cavity 3311 is D1 (mm), and the size of the connecting hole 334 is D2 (mm), where 1 / 30 ≤ D2 / D1 ≤ 1. For example, D2 / D1 can be 1 / 30, 1 / 10, 3 / 20, 1 / 4, 7 / 20, 2 / 5, 1 / 2, 3 / 5, 2 / 3, 3 / 4, 4 / 5, 17 / 20, 9 / 10, 19 / 20, or 1.

[0045] When the ratio of the size of the connecting hole 334 in the second direction to the size of the first cavity 3311 in the second direction is too small, the connecting hole 334 is relatively narrow. This will increase the flow resistance of the heat exchange medium when it flows through the connecting hole 334, reduce the flow efficiency of the heat exchange medium from the second cavity 3312 to the first cavity 3311, and affect the overall heat exchange performance.

[0046] When the ratio of the size of the connecting hole 334 in the second direction to the size of the first cavity 3311 in the second direction is too large, the connecting hole 334 is relatively wide and the first cavity 3311 is relatively narrow, which will limit the number of liquid inlet channels 31, thereby reducing the heat exchange efficiency of the heat exchange plate 30.

[0047] According to the battery pack 100 provided in the present utility model embodiment, the ratio of the size of the connecting hole 334 in the second direction to the size of the first cavity 3311 in the second direction is limited to the above-mentioned numerical range. This can ensure the flow efficiency of the heat exchange medium from the second cavity 3312 to the first cavity 3311, and also ensure the number of liquid inlet channels 31, thereby ensuring the heat exchange efficiency of the heat exchange plate 30.

[0048] As one possible implementation, refer to Figure 5 The dimension of the first cavity 3311 in the second direction is D1, in mm, where 80≤D1≤600. For example, D1 can be 80, 90, 110, 140, 180, 220, 260, 300, 340, 380, 420, 480, 520, 560 or 600.

[0049] When the size of the first cavity 3311 in the second direction is too small, it will increase the structural complexity of the liquid inlet cavity 331, increase the manufacturing cost, and reduce the manufacturing efficiency.

[0050] When the size of the first cavity 3311 in the second direction is too large, it will increase the size of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0051] According to the battery pack 100 provided in the embodiment of the present utility model, the size of the first cavity 3311 in the second direction is limited to the above-mentioned numerical range, so that the structural complexity of the liquid inlet cavity 331 is not excessively increased, nor is the size of the heat exchange plate 30 in the second direction excessively increased, thereby ensuring the space utilization and energy density of the battery pack 100.

[0052] As one possible implementation, the dimension of the connecting hole 334 in the second direction is D2, in mm, where 20 ≤ D2 ≤ 600. For example, D2 can be 20, 30, 50, 80, 110, 140, 180, 220, 260, 300, 350, 400, 480, 540 or 600.

[0053] When the size of the connecting hole 334 in the second direction is too small, the flow resistance of the heat exchange medium when it flows through the connecting hole 334 will increase, the flow efficiency of the heat exchange medium from the second cavity 3312 to the first cavity 3311 will decrease, and the overall heat exchange performance will be affected.

[0054] When the size of the connecting hole 334 in the second direction is too large, it is not conducive to the uniformity of the heat exchange medium distribution.

[0055] According to the battery pack 100 provided in the embodiment of the present utility model, the size of the connecting hole 334 in the second direction is limited to the above-mentioned numerical range, which can ensure the flow efficiency of the heat exchange medium from the second cavity 3312 to the first cavity 3311, and will not excessively increase the size of the heat exchange plate 30 in the second direction, thereby ensuring the uniformity of the heat exchange medium distribution.

[0056] refer to Figure 5 The manifold 33 includes a plurality of transverse partitions 335, which are located on the side of the plurality of longitudinal partitions 333 opposite to the second cavity 3312. The transverse partitions 335 are spaced apart in a second direction to separate the plurality of first cavities 3311. The dimension of each transverse partition 335 in the second direction is D3, in mm, where 5 ≤ D3 ≤ 20. For example, D3 can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 20.

[0057] When the size of the transverse spacer 335 in the second direction is too small, the structural strength of the transverse spacer 335 is insufficient, making it difficult to effectively isolate the first cavity 3311. Under system pressure or long-term vibration, it is prone to deformation or failure, affecting the independence between multiple first cavities 3311 and the stability of the flow channel structure.

[0058] When the size of the diaphragm 335 in the second direction is too large, the diaphragm 335 occupies too much space, which will limit the arrangement space of the liquid inlet channel 31, thereby restricting the flow capacity of the liquid inlet channel 31 and affecting the heat exchange efficiency of the heat exchange plate 30.

[0059] According to the battery pack 100 provided in the embodiment of the present utility model, the size of the transverse spacer 335 in the second direction is limited to the above-mentioned numerical range, which can ensure the independence between the multiple first cavities 3311 and the stability of the flow channel structure, and also ensure that the liquid inlet channel 31 has sufficient arrangement space, thereby ensuring the flow capacity of the liquid inlet channel 31.

[0060] Continue to refer to Figure 5 The flow manifold 33 includes multiple flow equalization holes 336, which extend from multiple first cavities 3311 to multiple liquid inlet channels 31. By providing multiple flow equalization holes 336 on the flow manifold 33, the heat exchange medium can be effectively guided, allowing it to smoothly and uniformly enter the corresponding liquid inlet channels 31 from the first cavities 3311. This implementation method can ensure the consistency of flow rate among the liquid inlet channels 31, ultimately ensuring that the multiple batteries 10 can obtain a highly uniform heat exchange effect, improving the efficiency and reliability of the heat exchange plate 30.

[0061] As one possible implementation, refer to Figure 4 The system includes at least two return channels 32, located on opposite sides of the multiple inlet channels 31 in a second direction. Compared to a single return channel 32, constructing two return channels 32 increases the total cross-sectional area of ​​the return channels 32, preventing significant abrupt changes in cross-sectional area when the heat exchange medium flows from the inlet channel 31 into the return channel 32. This ensures a smoother and more uniform flow of the heat exchange medium into the return channel 32, preventing localized stagnation and improving the circulation efficiency of the heat exchange medium.

[0062] refer to Figure 6 In the second direction, the dimension of each return flow channel 32 is D4 (in mm), and the dimension of the return cavity 332 is D5 (in mm), where 1 / 30 ≤ D4 / D5 ≤ 1. For example, D4 / D5 can be 1 / 30, 3 / 20, 3 / 10, 2 / 5, 7 / 12, 4 / 5, 5 / 6, 7 / 8, 9 / 10, 13 / 14, 19 / 20, or 1.

[0063] When the ratio of the size of the return liquid channel 32 in the second direction to the size of the return liquid chamber 332 in the second direction is too small, the size of the return liquid channel 32 in the second direction is small, which will lead to obstruction of return liquid, increase pressure drop, and affect the smooth flow of heat exchange medium return.

[0064] When the ratio of the dimension of the return liquid channel 32 in the second direction to the dimension of the return liquid cavity 332 in the second direction is too large, the dimension of the return liquid channel 32 in the second direction is large, which will increase the dimension of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0065] According to the battery pack 100 provided in the present utility model embodiment, the ratio of the size of the return liquid channel 32 in the second direction to the size of the return liquid cavity 332 in the second direction is limited to the above-mentioned numerical range. This ensures smooth return of liquid without excessively increasing the size of the heat exchange plate 30 in the second direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0066] As one possible implementation, each return flow channel 32 has a dimension of D4 in the second direction, in mm, where 10 ≤ D4 ≤ 100. For example, D4 ​​can be 10, 12, 15, 18, 22, 26, 30, 35, 40, 45, 50, 60, 70, 85 or 100.

[0067] When the size of the return liquid channel 32 in the second direction is too small, it will cause the return liquid to be blocked and the pressure drop to increase, which will affect the smooth flow of the heat exchange medium and is not conducive to the heat exchange efficiency of the heat exchange plate 30.

[0068] When the size of the return flow channel 32 in the second direction is too large, it will increase the size of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0069] According to the battery pack 100 provided in the present utility model embodiment, the size of the return liquid flow channel 32 in the second direction is limited to the above-mentioned numerical range, which can ensure smooth return liquid and avoid excessively increasing the size of the heat exchange plate 30 in the second direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0070] As one possible implementation, the return chamber 332 has a dimension D5 in the second direction, in mm, where 100 ≤ D5 ≤ 300. For example, D5 can be 100, 110, 115, 125, 135, 150, 165, 180, 200, 215, 235, 250, 270, 290, or 300.

[0071] When the size of the return liquid chamber 332 in the second direction is too small, it will reduce the return efficiency of the heat exchange medium.

[0072] When the size of the return liquid chamber 332 in the second direction is too large, it will increase the size of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0073] According to the battery pack 100 provided in the present utility model embodiment, the size of the liquid return chamber 332 in the second direction is limited to the above-mentioned numerical range, which can ensure smooth liquid return and avoid excessively increasing the size of the heat exchange plate 30 in the second direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0074] refer to Figure 7 The projections of the multiple batteries 10 along the height direction cover a portion of the projection of the return liquid channel 32 along the height direction. This portion is shown in the figure as being filled with oblique straight lines. Since the return liquid channel 32 is located on one side of the multiple inlet channels 31 in the second direction, it can effectively exchange heat with the external air of the heat exchange plate 30. Based on this, supporting a portion of the multiple batteries 10 on the return liquid channel 32 not only compresses the overall size of the heat exchange plate 30 in the second direction, thereby improving the space utilization and energy density of the battery pack 100, but also prevents the heat exchange medium in the return liquid channel 32 from transferring excessive heat back to the batteries 10.

[0075] refer to Figure 6 In the first direction, the size of the inlet chamber 331 is D6 (mm), and the size of the return chamber 332 is D7 (mm), where 2 / 5 ≤ D6 / D7 ≤ 5. For example, D6 / D7 can be 2 / 5, 1 / 2, 3 / 5, 7 / 10, 4 / 5, 9 / 10, 1, 3 / 2, 2, 5 / 2, 3, 7 / 2, 4, 9 / 2, or 5.

[0076] When the ratio of the size of the liquid inlet chamber 331 in the first direction to the size of the liquid return chamber 332 in the first direction is too small, the space occupied by the liquid return chamber 332 is too large, while the space occupied by the liquid inlet chamber 331 is small. This will result in a small flow rate of the heat exchange medium during the inflow stage, which is not conducive to the heat exchange efficiency of the heat exchange plate 30.

[0077] When the ratio of the size of the liquid inlet chamber 331 in the first direction to the size of the liquid return chamber 332 in the first direction is too large, the size of the liquid return chamber 332 in the first direction is too small. This will result in a large flow resistance of the heat exchange medium during the reflux process, which will cause the heat exchange medium to reflux poorly, affect the overall circulation efficiency, and may even cause temperature accumulation in local areas.

[0078] According to the battery pack 100 provided in this embodiment of the present invention, the ratio of the size of the liquid inlet chamber 331 in the first direction to the size of the liquid return chamber 332 in the first direction is limited to the above-mentioned numerical range. This can ensure smooth return of the heat exchange medium, thereby ensuring circulation efficiency, and can also ensure the flow rate and flow volume of the heat exchange medium when entering the liquid inlet chamber 331, thereby ensuring the heat exchange efficiency of the heat exchange plate 30.

[0079] As one possible implementation, the inlet chamber 331 has a dimension of D6 in the first direction, and the return chamber 332 has a dimension of D7 in mm, where 20 ≤ D6 ≤ 100. For example, D6 can be 20, 22, 25, 28, 32, 36, 40, 44, 48, 53, 58, 65, 75, 80, 85, 90, or 100.

[0080] When the size of the liquid inlet chamber 331 in the first direction is too small, the flow rate of the heat exchange medium in the inflow stage will be small, which is not conducive to the heat exchange efficiency of the heat exchange plate 30.

[0081] When the size of the liquid inlet chamber 331 in the first direction is too large, it will increase the size of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0082] According to the battery pack 100 provided in the embodiment of the present utility model, the size of the liquid inlet chamber 331 in the first direction is limited to the above-mentioned numerical range, which can ensure the flow rate of the heat exchange medium in the inflow stage and ensure the heat exchange efficiency of the heat exchange plate 30, while not excessively increasing the size of the heat exchange plate 30 in the second direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0083] As one possible implementation, the return chamber 332 has a dimension D7 in the first direction, in mm, where 20 ≤ D7 ≤ 50. For example, D7 can be 20, 21, 23, 25, 27, 29, 31, 33, 35, 37, 40, 43, 46, 48 or 50.

[0084] When the size of the return liquid chamber 332 in the first direction is too small, it will cause the return liquid to be blocked and the pressure drop to increase, which will affect the smooth flow of the heat exchange medium and is not conducive to the heat exchange efficiency of the heat exchange plate 30.

[0085] When the size of the return liquid chamber 332 in the first direction is too large, or when the size of the return liquid chamber 332 in the second direction is too large, this will increase the size of the heat exchange plate 30 in the second direction, which is not conducive to the space utilization and energy density of the battery pack 100.

[0086] According to the battery pack 100 provided in the embodiment of the present utility model, the size of the liquid return chamber 332 in the first direction is limited to the above-mentioned numerical range, which can ensure smooth liquid return and avoid excessively increasing the size of the heat exchange plate 30 in the second direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0087] refer to Figure 6 and Figure 9The distance between the inlet chamber 331 and the return chamber 332 in the first direction is D8, in mm, where 5 ≤ D8 ≤ 50. For example, D8 can be 5, 6, 8, 10, 12, 14, 17, 20, 23, 26, 30, 35, 40, 45 or 50.

[0088] When the distance between the liquid inlet chamber 331 and the liquid return chamber 332 in the first direction is too small, the isolation distance between them is insufficient. This will make it easy for the heat of the heat exchange medium in the liquid return chamber 332 to be transferred to the heat exchange medium in the liquid inlet chamber 331, thereby weakening the heat exchange capacity between the heat exchange medium in the liquid inlet chamber 331 and the battery 10, and ultimately reducing the heat exchange efficiency of the heat exchange plate 30.

[0089] When the distance between the liquid inlet chamber 331 and the liquid return chamber 332 in the first direction is too large, the overall size of the heat exchange plate 30 will increase, thereby affecting the compactness of the battery pack 100 structure and reducing the space utilization and energy density of the battery pack 100.

[0090] According to the battery pack 100 provided in the embodiment of the present utility model, the distance between the liquid inlet chamber 331 and the liquid return chamber 332 in the first direction is limited to the above-mentioned numerical range. This can reduce the probability of heat exchange between the heat exchange medium in the liquid return chamber 332 and the heat exchange medium in the liquid inlet chamber 331, and will not excessively increase the overall size of the heat exchange plate 30, thereby ensuring the space utilization and energy density of the battery pack 100.

[0091] refer to Figure 4 The heat exchange plate 30 also includes a confluence cavity 34, located on the side of the multiple inlet channels 31 away from the collector 33. The heat exchange medium flows from the end of the multiple inlet channels 31 away from the confluence cavity 34 to the end closer to the confluence cavity 34, flows through the confluence cavity 34 into two return channels 32, and then flows from the end of the two return channels 32 close to the confluence cavity 34 to the end away from the confluence cavity 34. After flowing out of the multiple inlet channels 31, the heat exchange medium first enters the confluence cavity 34 and then enters the return channels 32. This implementation ensures a relatively balanced flow rate in the two return channels 32. In addition, the smooth flow path of the heat exchange medium in the confluence cavity 34 reduces turbulence and local pressure fluctuations, thus improving flow stability and circulation efficiency.

[0092] refer to Figure 2 , Figure 8 and Figure 9The battery pack 100 also includes an inlet pipe 41 and a return pipe 42. The housing 20 includes two first housing plates 21 spaced apart along a first direction. The inlet pipe 41 and the return pipe 42 are fixed to the first housing plate 21 closest to the collector 33. The inlet pipe 41 forms an inlet channel 411, which communicates with the inlet chamber 331. The return pipe 42 forms a return channel 421, which communicates with the return chamber 332. The arrangement of the inlet pipe 41 and the return pipe 42 on the first housing plate 21 close to the collector 33 shortens the connection path between the inlet channel 411 and the inlet chamber 331, and between the return channel 421 and the return chamber 332, thereby shortening the channel length, reducing the flow resistance of the heat exchange medium, and improving the circulation efficiency.

[0093] refer to Figure 2 The battery pack 100 also includes electrical components 50, and the housing 20 includes a partition beam 23 extending along a second direction. The partition beam 23 is located between two first housing plates 21 to divide the interior of the housing 20 into a first receiving portion 201 and a second receiving portion 202. The first receiving portion 201 and the second receiving portion 202 respectively accommodate the electrical components 50 and multiple batteries 10. The projection of the first receiving portion 201 along the height direction covers the projection of the current collector 33 along the height direction. The partition beam 23 separates the electrical components 50 and multiple batteries 10 into different receiving portions, which can prevent the heat, sparks, or short circuit risks generated by the electrical components 50 during operation from affecting the batteries 10, thereby enhancing the electrical safety of the overall system. In addition, this implementation can also prevent the local temperature rise of the electrical components 50 from directly affecting the batteries 10, affecting the performance of the batteries 10 or causing abnormal temperature of the batteries 10, thereby ensuring the operational stability of the battery pack 100.

[0094] refer to Figure 2 The housing 20 also includes two second housing plates 22 spaced apart along a second direction, and two first housing plates 21 and two second housing plates 22 are fixed to the heat exchange plate 30. The heat exchange plate 30 can not only bear and support the weight of the battery 10, but also be thermally coupled to the battery 10. This implementation achieves both mechanical support and thermal management functions of the battery 10 with a single component, thereby reducing the number of components in the battery pack 100 and contributing to the lightweighting of the battery pack 100. Furthermore, the fixed connection between the two first housing plates 21 and the two second housing plates 22 and the heat exchange plate 30 can also enhance the rigidity and stability of the overall structure and improve the deformation resistance of the battery pack 100 under external forces, vibrations, or impacts.

[0095] <Example Electrical Equipment> refer to Figure 10 This utility model provides an electrical device 200, which includes a battery pack 100.

[0096] 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.

[0097] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0098] 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.

[0099] 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".

[0100] 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 cavity and the second cavity), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0101] 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); The housing (20) houses the plurality of batteries (10); as well as The heat exchange plate (30) includes a plurality of liquid inlet channels (31) extending along a first direction and at least one liquid return channel (32). The plurality of liquid inlet channels (31) are located at the bottom of the plurality of batteries (10) and exchange heat with the plurality of batteries (10). The at least one liquid return channel (32) is located on one side of the plurality of liquid inlet channels (31) in a second direction. The heat exchange medium flows from the plurality of liquid inlet channels (31) to the at least one liquid return channel (32) and flows in opposite directions in the plurality of liquid inlet channels (31) and the at least one liquid return channel (32). The projection of the plurality of batteries (10) along the height direction covers the projection of the plurality of liquid inlet channels (31) along the height direction. The first direction, the second direction and the height direction are perpendicular to each other.

2. The battery pack (100) according to claim 1, characterized in that, The heat exchange plate (30) includes a manifold (33), which includes a liquid inlet chamber (331) and a liquid return chamber (332) separated from each other. The liquid inlet chamber (331) is connected to the liquid inlet channel (31), and the liquid return chamber (332) is connected to the liquid return channel (32). In the first direction, the liquid inlet chamber (331) is located between the liquid return chamber (332) and the plurality of liquid inlet channels (31).

3. The battery pack (100) according to claim 2, characterized in that, The liquid inlet chamber (331) includes a plurality of first cavities (3311) spaced apart along the second direction, and each first cavity (3311) communicates with at least two of the plurality of liquid inlet channels (31).

4. The battery pack (100) according to claim 3, characterized in that, The liquid inlet chamber (331) includes a second cavity (3312) which extends along the second direction. The plurality of first cavities (3311) are respectively connected to the second cavity (3312) and the plurality of liquid inlet channels (31) in the first direction.

5. The battery pack (100) according to claim 4, characterized in that, The current collector (33) includes a plurality of longitudinal partitions (333), which are spaced apart along the second direction. A connecting hole (334) is formed between two adjacent longitudinal partitions (333). Each connecting hole (334) connects the second cavity (3312) and the corresponding first cavity (3311). In the second direction, the size of the first cavity (3311) is D1 in mm, and the size of the connecting hole (334) is D2 in mm, where 1 / 30≤D2 / D1≤1.

6. The battery pack (100) according to claim 5, characterized in that, The current collector (33) includes a plurality of transverse partitions (335), which are located on the side of the plurality of longitudinal partitions (333) away from the second cavity (3312). The plurality of transverse partitions (335) are spaced apart in the second direction to separate the plurality of first cavities (3311). The dimension of each transverse partition (335) in the second direction is D3, in mm, where 5 ≤ D3 ≤ 20.

7. The battery pack (100) according to claim 3, characterized in that, The flow collector (33) includes a plurality of flow equalization holes (336) extending from the plurality of first cavities (3311) to the plurality of liquid inlet channels (31).

8. The battery pack (100) according to claim 2, characterized in that, The number of the at least one return flow channel (32) is two, and the two return flow channels (32) are located on opposite sides of the plurality of inlet flow channels (31) in the second direction.

9. The battery pack (100) according to claim 8, characterized in that, In the second direction, the size of each return flow channel (32) is D4 in mm, and the size of the return cavity (332) is D5 in mm, 1 / 30≤D4 / D5≤1.

10. The battery pack (100) according to claim 1, characterized in that, The projection of the plurality of batteries (10) along the height direction covers a portion of the projection of the return fluid channel (32) along the height direction.

11. The battery pack (100) according to claim 2, characterized in that, In the first direction, the size of the inlet chamber (331) is D6 in mm, and the size of the return chamber (332) is D7 in mm, where 2 / 5 ≤ D6 / D7 ≤ 5.

12. The battery pack (100) according to claim 2, characterized in that, The distance between the liquid inlet chamber (331) and the liquid return chamber (332) in the first direction is D8, in mm, where 5 ≤ D8 ≤ 50.

13. The battery pack (100) according to claim 2, characterized in that, The heat exchange plate (30) further includes a confluence cavity (34), which is located on the side of the plurality of liquid inlet channels (31) away from the collector (33). The heat exchange medium flows from one end of the plurality of liquid inlet channels (31) away from the confluence cavity (34) to the end near the confluence cavity (34), flows through the confluence cavity (34) into the at least one return channel (32), and flows from one end of the at least one return channel (32) near the confluence cavity (34) to the end away from the confluence cavity (34).

14. The battery pack (100) according to claim 2, characterized in that, It also includes an inlet pipe (41) and a return pipe (42). The housing (20) includes two first housing plates (21) spaced apart along the first direction. The inlet pipe (41) and the return pipe (42) are fixed to the first housing plate (21) near the manifold (33) of the two first housing plates (21). The inlet pipe (41) forms an inlet channel (411) which is connected to the inlet chamber (331). The return pipe (42) forms a return channel (421) which is connected to the return chamber (332).

15. The battery pack (100) according to claim 14, characterized in that, It also includes electrical components (50), and the housing (20) further includes a partition beam (23) extending along the second direction, the partition beam (23) being located between the two first housing panels (21) to divide the interior of the housing (20) into a first accommodating portion (201) and a second accommodating portion (202), the first accommodating portion (201) and the second accommodating portion (202) respectively accommodating the electrical components (50) and the plurality of batteries (10), the projection of the first accommodating portion (201) along the height direction covering the projection of the current collector (33) along the height direction.

16. The battery pack (100) according to claim 14, characterized in that, The housing (20) also includes two second housing plates (22), which are spaced apart along the second direction, and the two first housing plates (21) and the two second housing plates (22) are fixed to the heat exchange plate (30).

17. An electrical appliance (200), characterized in that, The battery pack (100) includes any one of claims 1 to 16.

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