Battery liquid cooling system

Abstract

The utility model discloses a battery liquid cooling system which comprises a battery module formed by stacking a plurality of battery cells; the battery shell is internally provided with a containing groove, and the battery module is assembled in the containing groove; the flow channel plate is located between at least two adjacent battery cells, a liquid cooling flow channel is arranged in the flow channel plate, the liquid cooling flow channel and the battery cells are arranged at intervals, or the flow channel plate is attached to the side face of the battery cell on at least one side to form the liquid cooling flow channel; the immersion liquid inlet is used for introducing cooling liquid into the accommodating groove, and the immersion liquid outlet is communicated with the accommodating groove; and the liquid cooling flow channel is communicated with the accommodating groove. According to the utility model, the runner plate with the clear liquid cooling runner is arranged between the battery cells, so that the cooling liquid can be guided to orderly and efficiently flow between the battery cells. According to the design, the problem that the cooling efficiency is reduced after the temperature of the cooling liquid is increased in a traditional static immersion mode is solved, and the flowing cooling liquid can continuously take away heat and keep a relatively low temperature through system circulation.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery liquid cooling system. Background Art

[0002] With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, high-performance, high-energy-density lithium batteries serve as their core power source. The efficiency and reliability of their thermal management systems have become a key technical challenge. While traditional air cooling and direct-contact liquid cooling systems have addressed the heat dissipation issue for battery packs to a certain extent, they often struggle to achieve ideal heat dissipation efficiency and temperature uniformity when faced with high-power density, large-capacity battery packs. Therefore, immersion liquid cooling systems have become a research hotspot due to their superior heat dissipation performance.

[0003] Currently, immersion liquid cooling systems mostly use a static immersion method, whereby the coolant (typically a low-viscosity, high-thermal-conductivity insulating liquid) statically surrounds the battery cells, absorbing heat generated by the battery during charging and discharging through thermal conduction. However, this non-flowing method has significant limitations: as the battery continues to operate, the coolant gradually heats up due to heat absorption, resulting in a decrease in cooling efficiency. This can lead to the risk of battery overheating, affecting battery life and system safety.

[0004] To overcome these shortcomings, researchers have begun exploring immersion liquid cooling solutions that allow the coolant to flow, hoping to enhance the coolant's fluidity and heat exchange efficiency, leading to more uniform and efficient battery cooling. However, existing battery pack designs often use elastic, thin, sheet-like materials as spacers between battery cells. This design was originally intended to provide the necessary mechanical support and insulation protection, but its structural characteristics become a limiting factor when faced with flowing coolant. It is insufficient to support the smooth flow of coolant, resulting in increased flow resistance between battery cells, reduced flow velocity, and even the formation of dead zones or eddy currents in certain areas, seriously affecting the effective heat transfer across the large surface area of ​​the battery cells. Utility Model Content

[0005] In order to overcome at least one of the above-mentioned defects of the prior art, the present invention provides a battery liquid cooling system, which can solve the heat dissipation problem of a large surface of a battery cell.

[0006] The technical solution adopted by the present invention to solve the problem is:

[0007] A battery liquid cooling system comprises: a battery module, wherein the battery module is formed by stacking a plurality of battery cells; a battery casing, wherein the battery casing has a receiving tank, and the battery module is assembled in the receiving tank; a flow channel plate, wherein the flow channel plate is located between at least two adjacent battery cells, and wherein a liquid cooling flow channel is provided in the flow channel plate, wherein the liquid cooling flow channel is spaced apart from the battery cells, or the flow channel plate is bonded to the side surface of at least one side of the battery cells to form a liquid cooling flow channel; an immersion liquid inlet, wherein the immersion liquid inlet is connected to the battery casing, and wherein the immersion liquid inlet flows cooling liquid into the receiving tank; and an immersion liquid outlet, wherein the immersion liquid outlet is connected to the battery casing, and wherein the immersion liquid outlet is communicated with the receiving tank; wherein the liquid cooling flow channel is communicated with the receiving tank.

[0008] By adopting this solution, a flow plate with clear liquid cooling channels is placed between the battery cells, guiding the coolant to flow in an orderly and efficient manner between the cells. This design avoids the problem of cooling efficiency decreasing as the coolant heats up in traditional static immersion methods, because the flowing coolant can continuously remove heat and maintain a low temperature through system circulation.

[0009] Furthermore, a plurality of liquid cooling channels are provided, and the liquid cooling channels are arranged in parallel at equal intervals.

[0010] By adopting the above solution, equally spaced and parallel liquid cooling channels ensure uniform distribution and flow of the coolant within the battery pack, which means that each area of ​​the battery cell can obtain a similar cooling effect, avoiding local overheating or uneven cooling problems, thereby improving the overall performance and life of the battery pack.

[0011] Furthermore, solution inlets and outlets are provided at both ends of the liquid-cooling channel, and the areas of the solution inlets and outlets are the same as the cross-sectional area of ​​the liquid-cooling channel.

[0012] By adopting the above solution, the inlet and outlet areas are the same as the cross-sectional area of ​​the liquid-cooling channel, which means that when the coolant enters and exits the channel, no additional flow resistance will be generated due to the sudden change in cross-sectional area. At the same time, it helps to ensure the uniform distribution of the coolant among multiple liquid-cooling channels.

[0013] Furthermore, the flow channel plate includes a first surface and a second surface opposite to the first surface, and a plurality of equally spaced and mutually parallel liquid cooling channels are sequentially arranged on the first surface, and a ridge is formed between every two adjacent liquid cooling channels in a direction perpendicular to the liquid cooling channels.

[0014] By adopting the above solution, the presence of the ribs increases the overall structural strength of the runner plate. In the battery pack, the runner plate needs to withstand the pressure from the battery cells, the weight of the coolant, and possible vibrations and impacts. The ribs act as reinforcing ribs that can effectively disperse and resist these forces, thereby improving the stability and durability of the runner plate. Although the ribs themselves do not directly participate in the flow of coolant, they can serve as a bridge for heat conduction. When the heat generated by the battery cells is transferred to the runner plate through the liquid cooling channels, the ribs can disperse the heat to other parts of the runner plate more quickly, and then take the heat away through other liquid cooling channels or heat dissipation structures.

[0015] Furthermore, a plurality of liquid cooling channels and ridges are also provided on the second surface corresponding to the first surface.

[0016] By adopting this solution, since both the first and second surfaces are provided with liquid cooling channels and ridges, coolant can flow simultaneously on both surfaces, achieving double cooling efficiency. This design allows the battery pack to better control temperature under high power output or extreme operating conditions, improving the system's thermal management capabilities and safety.

[0017] Furthermore, the flow channel plate includes a first surface and a second surface opposite to the first surface, and the liquid cooling flow channel is located between the first surface and the second surface.

[0018] By adopting this solution, the design of the internal liquid cooling channel helps achieve thermal uniformity between and within the battery cells. As the coolant flows through the channel, it evenly removes heat from all parts of the battery cell, preventing local overheating. This helps improve the overall performance of the battery pack and extend its service life.

[0019] Furthermore, it is assumed that the length of the liquid cooling channel located at the edge of the channel plate from the edge of the channel plate is X1, and the interval distance between every two adjacent liquid cooling channels is X2, then X1>X2.

[0020] This solution helps reduce edge effects caused by machining errors, uneven installation, or environmental influences along the manifold plate edges. This edge effect can interfere with coolant flow and affect heat transfer efficiency. Leaving space around the manifold plate edges enhances overall structural stability. By offsetting the cooling channels inward, coolant flow within the primary working area is more stable and efficient.

[0021] Furthermore, the range of X2 is 5mm-6mm, and the range of X1 is 7-8mm.

[0022] By adopting the above solution, during the manufacturing and installation process, taking into account the particularity and precision requirements of the edge of the runner plate, the liquid cooling runner is set at a certain distance from the edge, which can reduce the manufacturing difficulty and installation risk.

[0023] Furthermore, the thickness of the flow channel plate is not less than 4 mm, and the distance between the liquid-cooling flow channel and the first surface or the second surface is not less than 0.5 mm.

[0024] By adopting the above solution, the flow channel plate can provide a relatively strong support structure to prevent deformation or cracking during use, and the distance between the liquid cooling channel and the first surface and the second surface helps to achieve effective heat exchange between the coolant and the battery cell.

[0025] Furthermore, the thickness of the flow channel plate is not less than 4 mm, and the depth of the liquid cooling channel is 1.5 mm-3 mm.

[0026] By adopting this solution, the depth of the liquid cooling channel ensures a stable coolant flow within the channel while ensuring sufficient heat exchange area. Shallow channels may not provide sufficient flow space, resulting in excessive coolant flow and high pressure loss, thus affecting heat exchange efficiency. Excessively deep channels increase manufacturing cost and difficulty, and may also hinder the uniform distribution of coolant within the channel. Therefore, selecting the appropriate channel depth is one of the key factors in ensuring cooling system performance.

[0027] In summary, the battery liquid cooling system provided by the present invention has the following technical effects:

[0028] 1. Improved heat dissipation efficiency: By providing clear liquid cooling channels between battery cells and guiding the orderly flow of coolant, heat exchange efficiency can be significantly improved. The flowing coolant continuously removes heat generated by the battery cells and maintains a low temperature through system circulation, effectively preventing battery overheating and improving the overall heat dissipation capacity of the battery pack.

[0029] 2. Improved temperature uniformity: Flowing coolant can be more evenly distributed between the battery cells, reducing thermal stress caused by temperature gradients and improving temperature uniformity within the battery pack. This helps extend battery life and improve the stability and reliability of the battery system.

[0030] 3. Reduced flow resistance: Compared to traditional designs that use thin elastic plates as spacers, the flow channel plate in this utility model has clear liquid cooling channels, which can significantly reduce the flow resistance of the coolant between the battery cells. This helps increase the flow rate of the coolant, improves heat exchange efficiency, and reduces the risk of dead zones or eddy currents forming between the battery cells.

[0031] 4. Enhanced Structural Strength: The runner plate not only serves as a coolant flow channel but also provides structural strength, providing the necessary mechanical support for the battery pack. This design helps enhance the overall structural stability of the battery pack and reduces the risk of damage due to vibration or impact.

[0032] 5. Improve system safety: By improving heat dissipation efficiency and temperature uniformity, the liquid cooling channel structure of the immersed battery helps reduce safety risks such as battery overheating and fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic cross-sectional view of a battery liquid cooling system according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the flow channel plate structure according to an embodiment of the present utility model;

[0035] Figure 3 This is a schematic structural diagram of the solution inlet and outlet side of a flow channel plate according to an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the flow channel plate structure according to an embodiment of the present utility model;

[0037] Figure 5 This is a schematic structural diagram of the solution inlet and outlet side of a flow channel plate according to an embodiment of the present utility model;

[0038] Figure 6 This is a schematic diagram of the flow channel plate structure according to an embodiment of the present utility model;

[0039] Figure 7 This is a schematic diagram of the solution inlet and outlet structure of a flow channel plate according to an embodiment of the present invention. The reference numerals are as follows: 1, flow channel plate; 11, liquid cooling channel; 12, liquid cooling channel; 13, ridge; 14, solution inlet and outlet; 2, first surface; 3, second surface; 4, battery housing; 41, receiving tank; 5, battery module; 51, battery cell; 6, immersion liquid inlet; 7, immersion liquid outlet. DETAILED DESCRIPTION

[0040] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In order to facilitate the understanding of the embodiments of the present invention, the following will be further explained with reference to specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0044] Example 1 of the present utility model is shown in FIG. Figures 1-6 As shown, a battery liquid cooling system is disclosed, including a battery module 5, a battery housing 4, a flow channel plate 1, an immersion liquid inlet 6 and an immersion liquid outlet 7. The battery module 5 is formed by stacking multiple battery cells 51. The battery housing 4 has a receiving groove 41. The battery module 5 is assembled in the receiving groove 41. Specifically, the battery module 5 and the receiving groove 41 can be fixed relative to each other by structural adhesive. The flow channel plate 1 is located between at least two adjacent battery cells 51. The flow channel plate 1 is provided with a liquid cooling channel 12. The liquid cooling channel 12 is connected to the battery cells. 51 intervals are arranged, or the flow channel plate 1 is fitted with the side surface of at least one side of the battery cell to form a liquid cooling flow channel 12; it should be noted that both ends of the liquid cooling flow channel 12 need to be connected to the receiving tank 41, the immersion liquid outlet 7 and the immersion liquid inlet 6 are both connected to the battery housing 4, and the immersion liquid outlet 7 is connected to the receiving tank 41; the immersion liquid inlet 6 introduces coolant into the receiving tank 41, and flows through the liquid cooling flow channel 12, and finally flows out from the immersion liquid outlet 7, which can guide the coolant to flow in an orderly and efficient manner between the battery cells. This design avoids the problem of decreased cooling efficiency after the coolant heats up in the traditional static immersion method, because the flowing coolant can continuously take away heat and maintain a low temperature through system circulation. The immersion liquid inlet 6 can also be connected to a heat exchange device and a circulation pump to exchange heat with the coolant flowing out of the receiving tank 41. This device is a prior art and will not be described in detail.

[0045] It should be noted that, in the battery module 5 in the immersion battery pack involved in this embodiment 1, the flow channel design between the battery cells is not limited to flowing immersion liquid or non-flowing immersion liquid.

[0046] In a specific embodiment, see Figure 1-Figure 2 As shown, the flow channel plate 1 is made of a porous diaphragm material with a thickness of about 4 mm, preferably more than 4 mm. The porous design allows the coolant to enter the interior of the material, improving the thermal conductivity. Of course, in other embodiments, other materials can also be used, and this embodiment does not make specific limitations. The flow channel plate 1 includes a first surface 2 and a second surface 3 opposite to the first surface 2. A plurality of liquid cooling channels 11 are provided on the first surface 2 or the second surface 3, and the liquid cooling channels 12 are arranged in parallel at equal intervals. The spacing of the liquid cooling channels 11 is preferably 5 mm-6 mm. The depth of the liquid cooling channels 11 is 3 mm, that is, the thickness of the flow channel plate 1 at the liquid cooling channel is 1 mm. The liquid cooling channels 11 are attached to the side walls of the battery cell, so that the liquid cooling channels 11 enclose to form a liquid cooling channel 12. Solution inlets and outlets 14 are provided at both ends of the liquid cooling channel 12. The area of ​​the solution inlet and outlet 14 is the same as the cross-sectional area of ​​the liquid cooling channel 12, so that the coolant flows evenly in the liquid cooling channel 12 in the battery pack. An outwardly protruding ridge 13 is formed between every two liquid cooling channels 11 . The ridge 13 is used to abut against the battery cell to cope with the impact force of the battery pack during collision.

[0047] It should be noted that the cross-section of the liquid cooling channel 11 includes but is not limited to U-shape, rectangle or semicircle, and the spacing and groove depth of the liquid cooling channel 11 can be changed based on actual conditions, and this embodiment does not make specific limitations; in some embodiments, the ridges 13 can be integrally formed with the flow channel plate 1, or a flexible material can be wrapped around a flat plate to form the ridges 13, and multiple ridges 13 are formed after multiple windings, and liquid cooling channels 11 are formed between adjacent ridges 13.

[0048] When the liquid cooling system of the battery pack is working, the coolant can flow in the liquid cooling channel 12 in the battery pack under the action of an external liquid cooling pump, thereby achieving a heat exchange effect on the battery cell and having a certain shock absorption and buffering effect.

[0049] In a specific embodiment, see Figure 3-Figure 4As shown, the flow channel plate 1 includes a first surface 2 and a second surface 3 opposite to the first surface 2, and a plurality of liquid cooling channels 11 are provided on the first surface 2 and the second surface 3. A convex ridge 13 is formed between every two adjacent liquid cooling channels 11 on the same surface, and the liquid cooling channels 12 on the same plane are arranged in parallel at equal intervals, so that the first surface 2 and the second surface 3 of the flow channel plate 1 have liquid cooling channels 11 and ridges 13. Preferably, the ridges 13 and the liquid cooling channels 11 on the two surfaces are opposite to each other one by one; the spacing between the liquid cooling channels 11 is preferably 5mm-6mm, and the liquid cooling channels 11 on the first plane are preferably 5mm-6mm. The groove depth of the groove 11 and the liquid cooling groove 11 on the second plane is 1.5mm, that is, the interval distance between the liquid cooling groove 11 on the first plane and the liquid cooling groove 11 on the second plane is 1mm. The liquid cooling grooves 11 on the first surface 2 and the second surface 3 of the flow channel plate 1 are respectively attached to the opposite side walls between the two battery cells, so that the liquid cooling grooves 11 are enclosed to form a liquid cooling flow channel 12. Solution inlets and outlets 14 are provided at both ends of the liquid cooling flow channel 12. The area of ​​the solution inlet and outlet 14 is the same as the cross-sectional area of ​​the liquid cooling flow channel 12, so that the coolant flows evenly in the liquid cooling flow channel 12 in the battery pack.

[0050] It should be noted that the cross-section of the liquid cooling channel 11 includes but is not limited to U-shape, rectangle or semicircle, and the spacing and groove depth of the liquid cooling channel 11 can be changed based on actual conditions, and this embodiment does not make specific limitations; in some embodiments, the ridges 13 can be integrally formed with the flow channel plate 1, or a flexible material can be wrapped around a flat plate to form the ridges 13, and multiple ridges 13 are formed after multiple windings, and liquid cooling channels 11 are formed between adjacent ridges 13.

[0051] In a specific embodiment, see Figure 5-Figure 6 As shown, the flow channel plate 1 includes a first surface 2 and a second surface 3 opposite to the first surface 2, and the liquid cooling channel 12 is located between the first surface 2 and the second surface 3. The liquid cooling channels 12 are arranged in parallel at equal intervals, and the spacing between the liquid cooling channels 12 is preferably 5mm-6mm, and the distance between the liquid cooling channels 12 and the first surface 2 or the second surface 3 is not less than 0.5mm, preferably 0.5mm. Therefore, the first surface 2 and the second surface 3 of the flow channel plate 1 are both planes, which are directly attached to the battery cells. When the liquid cooling system of the battery pack is working, the coolant can flow in the liquid cooling channel 12 in the battery pack under the action of an external liquid cooling pump, thereby achieving a heat exchange effect on the battery cells, and heat exchange is performed through the flow channel plate 1 as a whole, and the temperature uniformity is better.

[0052] It should be noted that the cross-section of the liquid cooling channel 11 includes but is not limited to U-shaped, rectangular or semicircular, and the spacing and groove depth of the liquid cooling channel 11 can be changed based on actual conditions, and this embodiment does not make specific limitations.

[0053] In the above embodiment, see Figure 2 、 Figure 4 and Figure 6 As shown, the length of the liquid-cooling channel 12 located at the edge of the flow channel plate 1 from the edge of the flow channel plate 1 is set to X1, and the distance between each two adjacent liquid-cooling channels 12 is X2, then X1>X2. Among them, the range of X2 is 5mm-6mm, and the range of X1 is 7-8mm. Such a design helps to reduce the edge effect caused by possible processing errors, uneven installation or external environmental influences on the edge of the flow channel plate 1. During the manufacturing and installation process, considering the particularity and precision requirements of the edge of the flow channel plate 1, the liquid-cooling channel 12 is set at a certain distance from the edge, which can reduce the manufacturing difficulty and installation risk.

[0054] In summary, the battery liquid cooling system provided by the present invention has the following technical effects:

[0055] 1. Improved heat dissipation efficiency: By providing clear liquid cooling channels 12 between the battery cells, the coolant is guided to flow in an orderly manner, significantly improving heat exchange efficiency. The flowing coolant continuously removes heat generated by the battery cells and maintains a low temperature through system circulation, effectively preventing battery overheating and improving the overall heat dissipation capacity of the battery pack.

[0056] 2. Improved temperature uniformity: Flowing coolant can be more evenly distributed between the battery cells, reducing thermal stress caused by temperature gradients and improving temperature uniformity within the battery pack. This helps extend battery life and improve the stability and reliability of the battery system.

[0057] 3. Reduced flow resistance: Compared to traditional designs that use thin elastic plates as spacers, the flow channel plate 1 in this invention features clear liquid cooling channels 12, significantly reducing the flow resistance of the coolant between the battery cells. This helps increase the coolant's flow rate, improves heat exchange efficiency, and reduces the risk of dead zones or eddy currents forming between the battery cells.

[0058] 4. Enhanced Structural Strength: The flow channel plate 1 not only serves as a coolant flow channel but also provides structural strength, providing the necessary mechanical support for the battery pack. This design helps enhance the overall structural stability of the battery pack and reduces the risk of damage due to vibration or impact.

[0059] 5. Improve system safety: By improving heat dissipation efficiency and temperature uniformity, the liquid cooling channel 12 structure of the immersed battery helps reduce safety risks such as battery overheating and fire.

[0060] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A battery liquid cooling system, characterized in that: include: A battery module (5), wherein the battery module (5) is formed by stacking a plurality of battery cells (51); A battery housing (4), wherein the battery housing (4) has a receiving groove (41), and the battery module (5) is assembled in the receiving groove (41); A flow channel plate (1), the flow channel plate (1) being located between at least two adjacent battery cells (51), a liquid cooling flow channel (12) being provided in the flow channel plate (1), the liquid cooling flow channel (12) being spaced apart from the battery cells (51), or the flow channel plate (1) being bonded to the side surface of at least one of the battery cells to form the liquid cooling flow channel (12); an immersion liquid inlet (6), the immersion liquid inlet (6) being connected to the battery housing (4), and the immersion liquid inlet (6) passing cooling liquid into the containing tank (41); an immersion liquid outlet (7), the immersion liquid outlet (7) being connected to the battery housing (4), the immersion liquid outlet (7) being in communication with the containing tank (41); Wherein, the liquid cooling channel (12) is communicated with the containing tank (41).

2. A battery liquid cooling system according to claim 1, characterized in that: A plurality of the liquid cooling channels (12) are provided, and the liquid cooling channels (12) are arranged in parallel at equal intervals.

3. A battery liquid cooling system according to claim 2, characterized in that: Solution inlets and outlets (14) are provided at both ends of the liquid cooling channel (12), and the areas of the solution inlets and outlets (14) are the same as the cross-sectional area of ​​the liquid cooling channel (12).

4. A battery liquid cooling system according to claim 2, characterized in that: The flow channel plate (1) comprises a first surface (2) and a second surface (3) opposite to the first surface (2); a plurality of liquid cooling channels (11) which are equally spaced and parallel to each other are sequentially arranged on the first surface (2); and a ridge (13) is formed between every two adjacent liquid cooling channels (11) in a direction perpendicular to the liquid cooling channels (11).

5. A battery liquid cooling system according to claim 4, characterized in that: A plurality of liquid cooling channels (11) and ridges (13) are also provided on the second surface (3) corresponding to the first surface (2).

6. The battery liquid cooling system according to claim 2, characterized in that: The flow channel plate (1) comprises a first surface (2) and a second surface (3) opposite to the first surface (2), and the liquid cooling channel (12) is located between the first surface (2) and the second surface (3).

7. A battery liquid cooling system according to any one of claims 1 to 6, characterized in that: The length of the liquid cooling channel (12) located at the edge of the channel plate (1) from the edge of the channel plate (1) is set to X1, and the spacing distance between each two adjacent liquid cooling channels (12) is set to X2, then X1>X2.

8. The battery liquid cooling system according to claim 7, characterized in that: The range of X2 is 5mm-6mm, and the range of X1 is 7-8mm.

9. The battery liquid cooling system according to claim 6, characterized in that: The thickness of the flow channel plate (1) is not less than 4 mm, and the distance between the liquid cooling flow channel (12) and the first surface (2) or the second surface (3) is not less than 0.5 mm.

10. A battery liquid cooling system according to claim 4 or 5, characterized in that: The thickness of the flow channel plate (1) is not less than 4 mm, and the depth of the liquid cooling channel (11) is 1.5 mm to 3 mm.

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