Liquid-cooled plate and battery pack

Abstract

To provide a liquid-cooled plate and a battery pack.SOLUTION: A liquid-cooled plate comprises a plate body and a separator. A cooling chamber is provided inside the plate body. A liquid inlet port and a liquid outlet port are provided on the plate body. The cooling chamber communicates with the outside via the liquid inlet port and the liquid outlet port. The separator is fitted to the plate body so as to divide the cooling chamber into a plurality of cooling passages. The adjacent cooling passages communicate with each other. The separator is distributed on the plate body in an uneven manner. The flowing velocity of a cooling liquid is high at a portion where a circulation area of the cooling passage is small, thus making it possible to improve the flowing velocity of the cooling liquid. The flowing velocity of the cooling liquid is low at a portion where the circulation area of the cooling passage is large, thus making it possible to extend the heat exchange time of the cooling liquid. As a result, heat dissipation uniformity of the liquid-cooled plate is improved.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to liquid cooled plates and battery packs. [Background technology]

[0002] A battery pack is an important element of an energy storage system, which stores and outputs electrical energy. The battery pack includes a battery case and battery cells mounted in the battery case, and several battery cells are connected in series and parallel to each other to improve the stored energy and output power of the battery pack. During the operation of the battery pack, the battery cells generate a large amount of heat. If the heat of the battery cells is too high, it will cause the risk of damage due to expansion of the battery cells, activation of the fire protection system, and so on, thereby affecting the normal operation of the battery pack.

[0003] In the prior art, a liquid cooling plate is usually installed in a battery case, and the liquid cooling plate includes a uniformly distributed cooling passage, and the flow of the cooling liquid in the cooling passage realizes heat dissipation of the battery cells. Here, the temperature of the cooling liquid at the inlet is low and the temperature of the cooling liquid at the outlet is high, but the uniformly distributed cooling passage makes it impossible to quickly discharge the high-temperature cooling liquid at the outlet because the flow speed of the cooling liquid is consistent. This results in poor heat dissipation efficiency of the battery cells at the outlet, and uneven heat dissipation of the entire energy storage pack. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a liquid cooling plate and a battery pack that can increase the heat dissipation efficiency of a battery cell at the liquid outlet and improve the heat dissipation uniformity. [Means for solving the problem]

[0005] A first aspect of the present invention provides a liquid-cooled plate comprising a plate and separators, a cooling chamber provided within the plate, a liquid inlet and a liquid outlet provided on the plate, the cooling chamber communicating with the outside via the liquid inlet and the liquid outlet, the separator attached to the plate, the separator dividing the cooling chamber into a plurality of cooling channels along a distribution direction of the liquid inlet and the liquid outlet, adjacent cooling channels communicating with each other, and the separators distributed non-uniformly on the plate.

[0006] In the present invention, the separators are distributed unevenly on the plate, and the flow rate of the coolant is fast in the areas where the flow area of ​​the cooling flow passage is small, thereby improving the flow rate of the coolant, and the flow rate of the coolant is slow in the areas where the flow area of ​​the cooling flow passage is large, thereby extending the heat exchange time of the coolant, thereby improving the heat dissipation uniformity of the liquid-cooled plate.

[0007] In some embodiments, the cooling flow path includes at least a first flow path and a second flow path, a cross-sectional flow area of ​​the first flow path is different from a cross-sectional flow area of ​​the second flow path, and along a distribution direction of the inlets and outlets, the first flow paths are distributed symmetrically with respect to a central axis, and / or the second flow paths are distributed symmetrically with respect to a central axis, and the central axis and the first direction form a predetermined included angle.

[0008] In the present invention, the cooling flow path includes a first flow path and a second flow path with different flow cross-sectional areas, thereby increasing the flow speed of the cooling liquid in the liquid-cooled plate, and thereby improving the cooling effect of the liquid-cooled plate on the battery pack. The cooling flow paths are distributed symmetrically about the central axis, which reduces the difficulty of processing the liquid-cooled plate, is advantageous for shortening the processing cycle of the liquid-cooled plate, reduces the size and number of equipment for processing the liquid-cooled plate, reduces the processing cost of the liquid-cooled plate, and reduces the difficulty of designing and processing the equipment for processing the liquid-cooled plate, which is advantageous for reducing the processing cost of the liquid-cooled plate.

[0009] In some embodiments, the flow cross-sectional area of the first flow path is larger than that of the second flow path. Along the distribution direction of the liquid inlet and the liquid outlet, the liquid inlet and the liquid outlet communicate with the first flow paths on both sides of the central axis respectively, and the second flow path is located between the first flow path and the central axis.

[0010] In some embodiments, along the distribution direction of the liquid inlet and the liquid outlet, the flow cross-sectional area of the cooling flow path gradually decreases, and the flow cross-sectional area of the cooling flow path at the liquid outlet is smaller than that at the liquid inlet.

[0011] In some embodiments, the plate body includes a first side wall and a second side wall that are oppositely arranged along a first direction. The separator includes a first separator and a second separator. Along the extending direction of the separator, one end of the first separator is connected to the first side wall, and there is a first gap between the other end of the first separator and the second side wall. One end of the second separator is connected to the second side wall, and there is a second gap between the other end of the second separator and the first side wall. Along the distribution direction of the liquid inlet and the liquid outlet, the first separator and the second separator are alternately distributed at intervals.

[0012] In some embodiments, along the extending direction of the separator, the length L1 of the first gap satisfies 0 < L1 ≤ 44 mm, and along the extending direction of the separator, the length L2 of the second gap satisfies 0 < L2 ≤ 44 mm.

[0013] In some embodiments, in a direction perpendicular to the extending direction of the separator and the thickness direction of the plate body, the thickness H1 of the first separator satisfies 3 mm ≤ H1 ≤ 5 mm, and in a direction perpendicular to the extending direction of the separator and the thickness direction of the plate body, the thickness H2 of the second separator satisfies 3 mm ≤ H2 ≤ 5 mm.

[0014] In some embodiments, the separator further includes a third separator. Along the extending direction of the separator, there is a third gap between one end of the third separator and the first side wall, and there is a fourth gap between the other end of the third separator and the second side wall. Along the distribution direction of the liquid inlet and the liquid outlet, at least a part of the third separator is located between the first separator and the second separator.

[0015] In some embodiments, along the extending direction of the separator, the length L3 of the third gap satisfies 0 < L3 ≤ 45 mm, and along the extending direction of the separator, the length L4 of the fourth gap satisfies 0 < L4 ≤ 16 mm.

[0016] In some embodiments, in the direction orthogonal to the extending direction of the separator and the thickness direction of the plate body, the thickness H3 of the third separator satisfies 3 mm ≤ H3 ≤ 5 mm.

[0017] In some embodiments, the separator includes a fourth separator. The fourth separator is provided on the central axis. The plate body includes a first side wall and a second side wall that are oppositely arranged along the first direction. Along the extending direction of the separator, there is a fifth gap between one end of the fourth separator and the first side wall, and the other end is connected to the second side wall. Or, along the extending direction of the separator, there is a sixth gap between one end of the fourth separator and the second side wall, and the other end is connected to the first side wall. Or, along the extending direction of the separator, there is a fifth gap between one end of the fourth separator and the first side wall, and there is a sixth gap between the other end and the second side wall. In the direction orthogonal to the extending direction of the separator and the thickness direction of the plate body, the thickness H4 of the fourth separator satisfies 7 mm ≤ H4 ≤ 8 mm.

[0018] In some embodiments, the plate includes a top wall and a bottom wall arranged opposite each other along the thickness direction of the liquid-cooled plate, the separator includes a partition, and a first transition portion and a second transition portion are respectively provided at both ends of the partition along the thickness direction of the liquid-cooled plate, the first transition portion being connected to the top wall and the second transition portion being connected to the bottom wall, and in a direction perpendicular to the extension direction of the separator and the thickness direction of the plate, the thickness of the first transition portion is greater than the thickness of the partition, and the thickness of the second transition portion is greater than the thickness of the partition.

[0019] In some embodiments, in a direction perpendicular to the extension direction of the separator and the thickness direction of the plate, the side wall of the first transition portion is a straight surface or an arcuate surface, and the side wall of the second transition portion is a straight surface or an arcuate surface.

[0020] A second aspect of the present invention provides a battery pack, comprising a battery case and a plurality of battery cells, the battery case including a cover plate and a bottom plate, the cover plate and the bottom plate surrounding and forming a housing cavity, the battery cells being mounted within the housing cavity, the bottom plate being any one of the liquid-cooled plates described above, or the liquid-cooled plate being mounted between the bottom plate and the battery cells. Effect of the Invention

[0021] In the present invention, in some cases, the bottom plate is used as a liquid-cooled plate, which is advantageous to reduce the overall size of the battery pack, thereby improving the energy density in the unit volume of the battery pack, and further improving the stored energy and discharge amount of the battery pack, thereby improving the usage performance of the battery pack. In other cases, the bottom plate is installed separately from the liquid-cooled plate, and when the liquid-cooled plate or the bottom plate is broken, it can be replaced separately, which makes it easy to install and replace the liquid-cooled plate and the bottom plate, and is advantageous to reduce the maintenance cost of the battery pack. Wherein, the cooling flow path includes a first flow path and a second flow path with different flow cross-sectional areas, so as to increase the flow speed of the cooling liquid in the liquid-cooled plate, thereby improving the cooling effect of the liquid-cooled plate on the battery pack. The cooling flow paths are distributed symmetrically with respect to the central axis, which reduces the difficulty of processing the liquid-cooled plate, which is advantageous to shorten the processing cycle of the liquid-cooled plate, which reduces the size and number of equipment for processing the liquid-cooled plate, which reduces the processing cost of the liquid-cooled plate, and which reduces the design and processing difficulty of the equipment for processing the liquid-cooled plate, which is advantageous to reduce the processing cost of the liquid-cooled plate.

[0022] It is to be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present invention. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is an exploded view of a local structure in one embodiment of a battery pack according to the present invention. [Diagram 2] FIG. 2 is a structural schematic diagram of the bottom plate in FIG. 1, where the bottom plate is a liquid-cooled plate. [Diagram 3] FIG. 3 is a perspective view of an embodiment of the liquid cooling plate in FIG. 2. [Figure 4] 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Diagram 5] FIG. 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Figure 6] FIG. 6 is a plan view of FIG. 5. [Figure 7]FIG. 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Figure 8] FIG. 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Figure 9] FIG. 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Figure 10] FIG. 3 is a perspective view of another embodiment of the liquid cooling plate in FIG. 2. [Figure 11] FIG. 3 is a left side view of an embodiment of the liquid cooling plate in FIG. 2. [Figure 12] FIG. 12 is an enlarged view of part A in FIG. [Figure 13] 13 is a schematic diagram of a connection structure between the separator and the plate body in FIG. 12 in one embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The drawings herein are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the specification, serve to explain the workings of the invention.

[0025] In order to better understand the solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the drawings.

[0026] Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that a person skilled in the art can obtain without inventive efforts fall within the scope of protection of the present invention.

[0027] The terms used in the embodiments of the present invention are only for the purpose of describing particular embodiments, and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise.

[0028] It should be understood that the term "and / or" used in this specification is only a relational relationship to describe related objects, and indicates that three kinds of relations may exist. For example, A and / or B can indicate three kinds of situations: A exists alone, A and B exist simultaneously, and B exists alone. Also, the symbol " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0029] It should be noted that directional terms such as "upper", "lower", "left", and "right" described in the embodiments of the present invention are described in terms of angles shown in the drawings and should not be understood as limitations on the embodiments of the present invention. In addition, it should be further noted that in the context, when referring to an element being connected to the "upper" or "lower" of another element, it may not only be directly connected to the "upper" or "lower" of the other element, but also indirectly connected to the "upper" or "lower" of the other element via an intermediate element.

[0030] A first aspect of an embodiment of the present invention provides a battery pack. As shown in Fig. 1, the battery pack includes a battery case 01 and a plurality of battery cells 02. The battery case 01 includes a cover plate 011 and a bottom plate 012, the cover plate 011 and the bottom plate 012 surround a receiving cavity, and the battery cells 02 are mounted in the receiving cavity. The plurality of battery cells 02 are arranged along a first direction Y and are bound and fixed as one battery module. The plurality of battery modules are arranged in the receiving cavity along a second direction X, the first direction Y being perpendicular to the second direction X, and both the first direction Y and the second direction X being perpendicular to the height direction of the battery pack.

[0031] In one embodiment, the inside of the bottom plate 012 is hollow and filled with a cooling liquid. The flow of the cooling liquid inside the bottom plate 012 realizes heat dissipation from the battery cells 02. That is, the bottom plate 012 is a liquid-cooled plate, which is advantageous for reducing the overall size of the battery pack, thereby improving the energy density in a unit volume of the battery pack, and further advantageous for improving the stored energy and discharge amount of the battery pack, thereby improving the usage performance of the battery pack. In another embodiment, the battery pack includes a liquid-cooled plate, the inside of the liquid-cooled plate is hollow and filled with a cooling liquid. The bottom plate 012 is installed separately from the liquid-cooled plate, and the liquid-cooled plate is attached to the bottom plate 012, and the liquid-cooled plate is located between the bottom plate 012 and the battery cells 02. The flow of the cooling liquid inside the bottom plate 012 realizes heat dissipation from the battery cells 02. The bottom plate 012 is installed separately from the liquid-cooled plate and can be replaced separately when the liquid-cooled plate or the bottom plate 012 are broken, which makes it easy to install and replace the liquid-cooled plate and the bottom plate 012 and is advantageous in reducing the maintenance costs of the battery pack.

[0032] A second aspect of the embodiment of the present invention provides a liquid-cooled plate. As described above, the liquid-cooled plate may be attached to the bottom plate 012 or may be used as the bottom plate 012. In the following, a detailed description will be given taking the bottom plate 012 as an example of a liquid-cooled plate.

[0033] As shown in Fig. 2 and Fig. 3, the liquid cooling plate includes a plate body 1 and a separator 2. A cooling chamber 11 is provided in the plate body 1. A liquid inlet 12 and a liquid outlet 13 are provided on the plate body 1. The cooling chamber 11 communicates with the outside through the liquid inlet 12 and the liquid outlet 13. The low-temperature cooling liquid from the outside enters the cooling chamber 11 through the liquid inlet 12 and flows out through the liquid outlet 13. The high-temperature cooling liquid that flows out enters a temporary storage box, or the high-temperature cooling liquid that flows out enters the cooling chamber 11 again through the liquid inlet 12 after being cooled by air cooling or a condenser. In the present invention, the flow method and the circulation method of the cooling liquid are not particularly limited. The separator 2 is attached to the plate body 1. The separator 2 divides the cooling chamber 11 into a plurality of cooling channels 14 along the distribution direction of the liquid inlet 12 and the liquid outlet 13, and the adjacent cooling channels 14 communicate with each other. Due to the separators 2 being distributed unevenly on the plate 1, the flow area of ​​the cooling channels 14 includes at least two sizes. In the area of ​​the cooling channels 14 with a small flow area, the flow speed of the coolant is fast, which can improve the flow speed of the coolant, and in the area of ​​the cooling channels 14 with a large flow area, the flow speed of the coolant is slow, which can extend the heat exchange time of the coolant, thereby improving the heat dissipation uniformity of the liquid-cooled plate.

[0034] The liquid-cooled plate may include a first direction Y, a second direction X, and a third direction Z, and the third direction Z may be parallel to the thickness direction of the liquid-cooled plate. One of the first direction Y and the second direction X may be parallel to the length direction of the liquid-cooled plate, and the other may be parallel to the width direction of the liquid-cooled plate. In FIG. 2, the first direction Y is simply parallel to the length direction of the liquid-cooled plate, and the second direction X is parallel to the width direction of the liquid-cooled plate, as an example.

[0035] In some embodiments, the inlets 12 and the outlets 13 are distributed along a first direction Y, or the inlets 12 and the outlets 13 are distributed along a second direction X, or the distribution direction of the inlets 12 and the outlets 13 forms an included angle greater than 0° and smaller than 90° with the first direction Y and the second direction X. As shown in FIG. 8, the distribution direction of the inlets 12 and the outlets 13 forms a predetermined included angle α with the extension direction of the separator 2, and satisfies 0°≦α≦90°. When α=0°, the extension direction of the separator 2 is parallel to the second direction X, when α=90°, the extension direction of the separator 2 is parallel to the first direction Y, and when 0°<α<90°, the extension direction of the separator 2 forms an included angle with both the first direction Y and the second direction X.

[0036] In some embodiments, as shown in FIG. 3 , the cooling flow path 14 includes at least a first flow path 141 and a second flow path 142, and the cross-sectional flow area of ​​the first flow path 141 and the cross-sectional flow area of ​​the second flow path 142 are different, and along the distribution direction of the liquid inlet 12 and the liquid outlet 13, the first flow path 141 is distributed symmetrically with respect to the central axis 15, and / or the second flow path 142 is distributed symmetrically with respect to the central axis 15, and the central axis 15 and the first direction Y form a predetermined included angle.

[0037] The separator 2 divides the cooling chamber 11 into a plurality of cooling channels 14, and the cooling channels 14 are distributed symmetrically with respect to the central axis 15. In the process of processing the liquid-cooled plate, the liquid-cooled plate on one side of the central axis 15 may be processed first, and then the liquid-cooled plate on the other side of the central axis 15 may be processed. This allows the liquid-cooled plate to have a separate structure symmetrically distributed with respect to the central axis 15. In this way, the processing difficulty of the liquid-cooled plate is reduced, which is advantageous for shortening the processing cycle of the liquid-cooled plate, reducing the size and number of equipment for processing the liquid-cooled plate, and further reducing the processing cost of the liquid-cooled plate. In addition, the processing equipment for the liquid-cooled plate may be designed to have a structure symmetrical with respect to the central axis 15. This allows the liquid-cooled plate to be processed into an integrated structure by simultaneously processing the parts located on both sides of the central axis 15, which reduces the design difficulty and processing difficulty of the liquid-cooled plate processing equipment, and further reduces the processing cost of the liquid-cooled plate.

[0038] In some embodiments, the extension direction of the central axis 15 is parallel to the first direction Y, or the extension direction of the central axis 15 is parallel to the second direction X, or the extension direction of the central axis 15 forms an included angle between the extension direction of the central axis 15 and the first direction Y or the second direction X that is greater than 0° and less than 90°. As shown in FIG. 2, for example, the extension direction of the central axis 15 is parallel to the first direction Y.

[0039] In some cases, the extension directions of adjacent separators 2 are parallel and / or form an included angle of less than 90°. For convenience of description, hereinafter, it is taken as an example that the extension directions of all separators 2 are parallel to the first direction Y.

[0040] When the cross-sectional flow area of ​​the first flow path 141 and the cross-sectional flow area of ​​the second flow path 142 are different, the following situations exist: That is, the width of the first flow path 141 and the width of the second flow path 142 are different in the second direction X, and / or the height of the first flow path 141 and the height of the second flow path 142 are different in the third direction Z. In the following, the cases where the width of the first flow path 141 in the second direction X and the width of the second flow path 142 in the second direction X are different are taken as examples.

[0041] In some embodiments, as shown in Fig. 3, the cross-sectional flow area of ​​the first flow passage 141 is larger than the cross-sectional flow area of ​​the second flow passage 142. Referring to Figs. 2 and 3, along the distribution direction of the liquid inlet 12 and the liquid outlet 13, i.e., along the second direction X, the liquid inlet 12 and the liquid outlet 13 are respectively connected to the first flow passages 141 on both sides of the central axis 15, and the second flow passage 142 is located between the first flow passage 141 and the central axis 15.

[0042] In some cases, the first flow paths 141 are distributed symmetrically with respect to the central axis 15, and / or the second flow paths 142 are distributed symmetrically with respect to the central axis 15, and the cross-sectional area of ​​the first flow paths 141 is larger than that of the second flow paths 142, so that the cross-sectional area of ​​the cooling flow paths 14 at the inlet 12 and outlet 13 is larger than that of the cooling flow paths 14 at the central axis 15. In this way, the flow rate of the cooling liquid at the inlet 12 and outlet 13 is large and the flow speed is low, which extends the heat exchange time between the cooling liquid at the inlet 12 and outlet 13 and the upper battery cell 02, and improves the heat dissipation efficiency of the liquid-cooled plate for the battery cell 02 there. Since the cross-sectional area of ​​the cooling flow paths 14 at the central axis 15 is small, the flow rate of the cooling liquid near the central axis 15 is small, which increases the flow speed of the cooling liquid near the central axis 15, and further improves the heat dissipation efficiency of the liquid-cooled plate for the battery cell 02. At the same time, the coolant at the inlet 12 can flow quickly to the outlet 13, reducing the risk of the coolant flow being disrupted due to a lack of kinetic energy of the coolant near the central axis 15, and also reducing the risk of impurities in the coolant or substances precipitated in the coolant accumulating in the cooling flow passage 14. In this way, the risk of the flow passage in the cold zone being blocked is reduced, which in turn improves the operational stability of the liquid-cooled plate and is advantageous in extending the service life of the liquid-cooled plate.

[0043] 7 to 10, the cross-sectional area of ​​the cooling channels 14 gradually decreases along the distribution direction of the liquid inlets 12 and the liquid outlets 13, for example along the second direction X. The cross-sectional area of ​​the cooling channels 14 may vary uniformly or non-uniformly.

[0044] There are several ways in which the cross-sectional flow area of ​​the cooling flow passage 14 gradually decreases. That is, the width of the cooling flow passage 14 gradually decreases in the second direction X, and / or the height of the cooling flow passage 14 gradually decreases in the third direction Z. In the following, a case in which the width of the first flow passage 121 in the second direction X and the width of the second flow passage 122 in the second direction X are different will be taken as an example.

[0045] In some embodiments, the cross-sectional area of ​​the cooling flow channel 14 at the inlet 12 is large and the cross-sectional area of ​​the cooling flow channel 14 at the outlet 13 is small, so that the flow rate of the cooling liquid at the inlet 12 is large and the flow rate is small, and the flow rate of the cooling liquid at the outlet 13 is small and the flow rate is large. That is, in the process of the cooling liquid flowing from the inlet 12 to the outlet 13, the flow rate gradually increases, so that the high-temperature cooling liquid at the outlet 13 can be quickly discharged, and the low-temperature cooling liquid at the inlet 12 can quickly flow to the outlet 13. In this way, the heat dissipation efficiency of the battery cell 02 at the outlet 13 is improved, and the heat dissipation uniformity of the entire liquid cooling plate is further improved.

[0046] As shown in Figures 2, 3, 6 and 11, the plate body 1 includes a first side wall 16 and a second side wall 17 arranged opposite each other along a first direction Y, a third side wall 18 and a fourth side wall 19 arranged opposite each other along a second direction X, and a top wall 1a and a bottom wall 1b arranged opposite each other along a third direction Z, and the first side wall 16, the second side wall 17, the third side wall 18, the fourth side wall 19, the top wall 1a and the bottom wall 1b surround and form a cooling chamber 11, and both ends of the separator 2 in the third direction Z are connected to the top wall 1a and the bottom wall 1b, respectively. By providing both the inlet port 12 and the outlet port 13 in the top wall 1a, the installation space for the inlet port 12 and the outlet port 13 is increased, making it easier to install the inlet port 12 and the outlet port 13 in the pipeline, and by providing the inlet port 12 and the outlet port 13 in the first side wall 16, the second side wall 17, the third side wall 18 or the fourth side wall 19, the risk of an increase in the overall thickness of the bottom wall 1b is reduced.

[0047] As shown in FIGS. 3 and 6, the separator 2 includes a first separator 21 and a second separator 22. Along the extending direction of the separator 2, one end of the first separator 21 is connected to the first side wall 16, and there is a first gap between the other end of the first separator 21 and the second side wall 17. One end of the second separator 22 is connected to the second side wall 17, and there is a second gap between the other end of the second separator 22 and the first side wall 16. Adjacent cooling channels 14 communicate with each other through the first gap or the second gap. Along the distribution direction of the liquid inlet 12 and the liquid outlet 13, for example, along the second direction X, the first separator 21 and the second separator 22 are alternately distributed at intervals.

[0048] In some cases, the first separator 21 and the second separator 22 are alternately distributed at intervals along the second direction X, so that the first gap and the second gap are alternately distributed at intervals along the second direction X. Furthermore, since the flow path of the coolant in the cooling channel 14 is in an S shape, the flow path of the coolant in the cooling channel 14 is lengthened, and further the heat exchange time of the coolant is extended, thereby improving the heat dissipation efficiency of the liquid-cooled plate for the battery cell 02.

[0049] The extending direction of the separator 2 is parallel to the first direction Y, or an included angle greater than 0° and less than 90° is formed between the extending direction of the separator 2 and the first direction Y to improve the flexibility of the installation of the separator 2. In FIG. 3, it is taken as an example that the extending direction of the separator 2 is parallel to the first direction Y.

[0050] As shown in FIGS. 3 and 6, along the extending direction of the separator 2, for example, along the first direction Y, the length L1 of the first gap satisfies 0 < L1 ≤ 44 mm. Specifically, the length of the first gap may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm or 44 mm, etc.

[0051] When the length of the first gap is large, that is, when L1 > 44 mm, the flow velocity of the coolant in the first gap is small, and there is a risk that impurities in the coolant and substances precipitated from the coolant will accumulate in the first gap. Therefore, there is a risk that the first gap will be blocked. Thus, by setting 0 < L1 ≤ 44 mm, the flow velocity of the coolant in the first gap can be accelerated, the stability of the coolant flowing in the cooling channel 14 can be enhanced, and further the operating stability of the liquid cooling plate and the service life of the liquid cooling plate can be improved.

[0052] Along the extending direction of the separator 2, for example, along the first direction Y, the length L2 of the second gap satisfies 0 < L2 ≤ 44 mm. Specifically, the length of the second gap may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, or 44 mm, etc.

[0053] When the length of the second gap is large, that is, when L2 > 44 mm, the flow velocity of the coolant in the second gap is small, and there is a risk that impurities in the coolant and substances precipitated from the coolant will accumulate in the second gap. Therefore, there is a risk that the second gap will be blocked. Thus, by setting 0 < L2 ≤ 44 mm, the flow velocity of the coolant in the second gap can be accelerated, the stability of the coolant flowing in the cooling channel 14 can be enhanced, and further the operating stability of the liquid cooling plate and the service life of the liquid cooling plate can be improved.

[0054] As shown in FIGS. 3 and 6, in the direction perpendicular to the extending direction of the separator 2, for example, in the second direction X, the thickness H1 of the first separator 21 satisfies 3 mm ≤ H1 ≤ 5 mm. Specifically, the thickness of the first separator 21 may be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, or 5 mm, etc.

[0055] When the thickness of the first separator 21 is small, that is, when H1<3 mm, the processing of the first separator 21 is difficult, which increases the processing cost of the first separator 21. In addition, the structural strength of the first separator 21 is weak, so that the first separator 21 is likely to bend and break under the action of the pressure of the cooling liquid. When the thickness of the first separator 21 is large, that is, when H1>5 mm, the material cost of the first separator 21 is high, and the space of the cooling chamber 11 occupied by the first separator 21 is large, so that the flow cross-sectional area of ​​the cooling flow path 14 is small, which reduces the volume of the cooling liquid in the cooling chamber 11 and further reduces the cooling efficiency of the liquid-cooled plate. Therefore, by setting H1 to 3 mm≦H1≦5 mm, the processing costs and material costs of the first separator 21 can be reduced while improving the structural strength of the first separator 21, the service life of the first separator 21 can be extended, and the capacity of the cooling chamber 11 can be increased, further improving the cooling effect of the liquid-cooled plate.

[0056] 3 and 6, in a direction perpendicular to the extending direction of the separator 2 and the third direction Z, for example, in the second direction X, the thickness H2 of the second separator 22 satisfies 3 mm≦H2≦5 mm. Specifically, the thickness of the second separator 22 may be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, or the like.

[0057] When the thickness of the second separator 22 is small, that is, when H2<3 mm, the processing of the second separator 22 is difficult, which increases the processing cost of the second separator 22. In addition, the structural strength of the second separator 22 is weak, so that the second separator 22 is likely to bend and break under the action of the pressure of the cooling liquid. When the thickness of the second separator 22 is large, that is, when H2>5 mm, the material cost of the second separator 22 is high, and the space of the cooling chamber 11 occupied by the second separator 22 is large, so that the flow cross-sectional area of ​​the cooling flow path 14 is small, which reduces the volume of the cooling liquid in the cooling chamber 11 and further reduces the cooling efficiency of the liquid-cooled plate. Therefore, by setting H2 to 3 mm≦H2≦5 mm, the processing costs and material costs of the second separator 22 can be reduced while improving the structural strength of the second separator 22, the service life of the second separator 22 can be extended, and the capacity of the cooling chamber 11 can be increased, further improving the cooling effect of the liquid-cooled plate.

[0058] As shown in Figures 4 and 10, the separator 2 further includes a third separator 23, and along the extension direction of the separator 2, for example, along the first direction Y, a third gap exists between one end of the third separator 23 and the first side wall 16, and a fourth gap exists between the other end of the third separator 23 and the second side wall 17. Along the distribution direction of the liquid inlet 12 and the liquid outlet 13, for example, along the second direction X, at least one third separator 23 is provided between the first separator 21 and the second separator 22. In addition, between the first separator 21 and the third side wall 18, there may be no third separator 23, or at least one third separator 23 may be provided, and / or between the first separator 21 and the fourth side wall 19, there may be no third separator 23, or at least one third separator 23 may be provided, i.e., at least a portion of the third separators 23 are located between the first separator 21 and the second separator 22.

[0059] By installing the third separator 23, the number of branch channels of the cooling channel 14 in the cooling chamber 11 can be increased, further increasing the flow path of the coolant, improving the cooling effect of the liquid-cooled plate, reducing the risk of slow coolant flow speed due to the large gap between the first separator 21 and the second separator 22, further improving the cooling effect of the liquid-cooled plate, and reducing the risk of impurities in the coolant or substances deposited in the coolant accumulating in the cooling channel 14, thereby reducing the risk of blockage of the cold zone channels, and ultimately improving the operating stability of the liquid-cooled plate, which is beneficial to extending the service life of the liquid-cooled plate.

[0060] Specifically, as shown in FIGS. 4 and 9, along the extending direction of the separator 2, for example, along the second direction X, the length L3 of the third gap satisfies 0 < L3 ≤ 45 mm. Specifically, the length of the third gap may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, or 45 mm, etc. Along the extending direction of the separator 2, for example, along the second direction X, the length L4 of the fourth gap satisfies 0 < L4 ≤ 16 mm. The length of the fourth gap may be 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, or 16 mm, etc.

[0061] When the length of the third gap is large, that is, when L3 > 45 mm, the flow velocity of the coolant in the third gap is small, and there is a risk that impurities in the coolant and substances precipitated from the coolant will accumulate in the third gap. Therefore, there is a risk that the third gap will be blocked. Therefore, by setting 0 < L3 ≤ 44 mm, it is possible to accelerate the flow velocity of the coolant in the third gap, enhance the stability of the coolant flowing in the cooling channel 14, and further improve the operating stability of the liquid-cooled plate and the service life of the liquid-cooled plate. Similarly, when the length of the fourth gap is large, that is, when L4 > 16 mm, the flow velocity of the coolant in the fourth gap is small, and there is a risk that impurities in the coolant and substances precipitated from the coolant will accumulate in the fourth gap. Therefore, there is a risk that the fourth gap will be blocked. Therefore, by setting 0 < L4 ≤ 16 mm, it is possible to accelerate the flow velocity of the coolant in the fourth gap, enhance the stability of the coolant flowing in the cooling channel 14, and further improve the operating stability of the liquid-cooled plate and the service life of the liquid-cooled plate.

[0062] As shown in FIGS. 4 and 9, in a direction perpendicular to the extending direction of the separator 2, for example, in the first direction Y, the thickness H3 of the third separator 23 satisfies 3 mm ≤ H3 ≤ 5 mm. Specifically, the thickness of the third separator 23 may be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm or 5 mm, etc. Also, the length of the third gap and the length of the fourth gap may be different or the same. In this way, the selectable range of the length dimensions of the third gap and the fourth gap can be widened, which is advantageous for improving and optimizing the heat dissipation effect of the liquid-cooled plate on the battery cell 02.

[0063] When the thickness of the third separator 23 is small, that is, when H3<3 mm, the processing of the third separator 23 is difficult, which increases the processing cost of the third separator 23. In addition, the structural strength of the third separator 23 is weak, so that the third separator 23 is likely to bend and break under the action of the pressure of the cooling liquid. When the thickness of the third separator 23 is large, that is, when H3>5 mm, the material cost of the third separator 23 is high, and the space of the cooling chamber 11 occupied by the third separator 23 is large, so that the width of the cooling flow passage 14 is small, which reduces the volume of the cooling liquid in the cooling chamber 11 and further reduces the cooling efficiency of the liquid-cooled plate. Therefore, by setting H3 to 3 mm≦H3≦5 mm, the processing costs and material costs of the third separator 23 can be reduced while improving the structural strength of the third separator 23, the service life of the third separator 23 can be extended, and the capacity of the cooling chamber 11 can be increased, further improving the cooling effect of the liquid-cooled plate.

[0064] In any one of the above embodiments, as shown in Fig. 5, Fig. 6 and Fig. 10, the separator 2 further includes a fourth separator 24, and the fourth separator 24 is provided on the central axis 15. In some examples, referring to Fig. 6, along the extension direction of the separator 2, for example, along the second direction X, there is a fifth gap between one end of the fourth separator 24 and the first side wall 16, and the other end of the fourth separator 24 is connected to the second side wall 17. In other examples, along the extension direction of the separator 2, for example, along the second direction X, there is a sixth gap between one end of the fourth separator 24 and the second side wall 17, and the other end of the fourth separator 24 is connected to the first side wall 16. In still other examples, along the extension direction of the separator 2, for example, along the second direction X, a fifth gap exists between one end of the fourth separator 24 and the first side wall 16, and a sixth gap exists between the other end of the fourth separator 24 and the second side wall 17.

[0065] It should be explained that in Figures 5 and 6, an example is shown in which a fifth gap exists between one end of the fourth separator 24 and the first side wall 16, and the other end is connected to the second side wall 17, and in Figure 10, an example is shown in which one end of the fourth separator 24 is connected to the first side wall 16, and a sixth gap exists between the other end and the second side wall 17.

[0066] In this way, a fourth separator 24 is provided on the central axis 15, and the fourth separator 24 can provide support for the top wall 1a and bottom wall 1b located on the central axis 15, reducing the risk of collapse, deformation, etc. due to insufficient support received by the liquid-cooled plate at the position of the central axis 15, improving the structural strength of the liquid-cooled plate, and being advantageous in extending the service life of the liquid-cooled plate.

[0067] 6, in a direction perpendicular to the extending direction of the separator 2, for example, in the second direction X, the thickness H4 of the fourth separator 24 satisfies 7 mm≦H4≦8 mm. Specifically, the thickness of the fourth separator 24 may be 7 mm, 7.1 mm, 7.2 mm, 7.3 mm, 7.4 mm, 7.5 mm, 7.6 mm, 7.7 mm, 7.8 mm, 7.9 mm, 8 mm, or the like.

[0068] When the thickness of the fourth separator 24 is small, i.e., H4<7 mm, the supporting effect of the fourth separator 24 on the top wall 1a and the bottom wall 1b is poor, and when the thickness of the fourth separator 24 is large, i.e., H4>8 mm, the material cost of the fourth separator 24 is high and the space of the cooling chamber 11 occupied by the fourth separator 24 is large, so the flow cross-sectional area of ​​the cooling flow path 14 is small, thereby reducing the volume of the coolant in the cooling chamber 11 and further reducing the cooling efficiency of the liquid-cooled plate. Therefore, by setting 7 mm≦H4≦8 mm, it is possible to reduce the processing cost and material cost of the fourth separator 24 while improving the supporting effect of the fourth separator 24, and further improve the structural strength of the middle part of the liquid-cooled plate to extend the service life of the liquid-cooled plate and increase the volume of the cooling chamber 11, and further improve the cooling effect of the liquid-cooled plate on the battery cells 02.

[0069] As shown in FIG. 6, along the extending direction of the separator 2, for example, along the second direction X, the length L5 of the fifth gap satisfies 0 < L5 ≤ 50 mm. Specifically, the length of the fifth gap may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc.

[0070] When the length of the fifth gap is large, that is, when L5 > 50 mm, the flow velocity of the cooling liquid in the fifth gap is small, and there is a risk that impurities in the cooling liquid and substances precipitated from the cooling liquid will accumulate in the fifth gap. Therefore, there is a risk that the fifth gap will be blocked. Therefore, by setting 0 < L5 ≤ 50 mm, the flow velocity of the cooling liquid in the fifth gap can be accelerated, the stability of the cooling liquid flowing in the cooling channel 14 can be enhanced, and further the operating stability of the liquid cooling plate and the service life of the liquid cooling plate can be improved.

[0071] As shown in FIG. 10, along the extending direction of the separator 2, for example, along the second direction X, the length L6 of the sixth gap satisfies 0 < L6 ≤ 50 mm. Specifically, the length of the sixth gap may be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc.

[0072] When the length of the sixth gap is large, that is, when L6 > 50 mm, the flow velocity of the cooling liquid in the sixth gap is small, and there is a risk that impurities in the cooling liquid and substances precipitated from the cooling liquid will accumulate in the sixth gap. Therefore, there is a risk that the sixth gap will be blocked. Therefore, by setting 0 < L6 ≤ 50 mm, the flow velocity of the cooling liquid in the sixth gap can be accelerated, the stability of the cooling liquid flowing in the cooling channel 14 can be enhanced, and further the operating stability of the liquid cooling plate and the service life of the liquid cooling plate can be improved.

[0073] In any one of the above embodiments, as shown in Figures 11, 12 and 13, the separator 2 includes a partition 25, a first transition portion 26 and a second transition portion 27, the first transition portion 26 and the second transition portion 27 are located at both ends of the partition 25 along the third direction Z, the partition 25 is connected to the top wall 1a via the first transition portion 26, the partition 25 is connected to the bottom wall 1b via the second transition portion 27, and along the second direction X, the thickness dimension of the separator 2 at the first transition portion 26 and the thickness dimension of the separator 2 at the second transition portion 27 are both larger than the thickness dimension of the partition 25. In this way, the connection area between the separator 2 and the top wall 1a and the bottom wall 1b is increased, thereby improving the connection strength between the separator 2 and the top wall 1a and the bottom wall 1b.

[0074] In some embodiments, the outer contour of the first transition portion 26 may be a straight surface or a circular arc surface. The outer contour of the second transition portion 27 may be a straight surface or a circular arc surface. FIG. 13 illustrates an example in which the outer contour of the first transition portion 26 is a circular arc surface and the outer contour of the second transition portion 27 is a circular arc surface. Since the outer contours of the first transition portion 26 and the second transition portion 27 are both circular arc surfaces, the first transition portion 26 and the second transition portion 27 can be easily processed.

[0075] In some embodiments, the radius R1 of the first transition portion 26 satisfies 1 mm≦R1≦2 mm. For example, the radius of the first transition portion 26 may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. When R1<1 mm, the processing difficulty and processing cost of the first transition portion 26 increase, and when R1>2 mm, the thickness of the separator 2 increases. Therefore, by setting 1 mm≦R1≦2 mm, the processing cost of the separator 2 can be reduced while the thickness of the separator 2 can be reduced, which is advantageous for improving the cooling efficiency of the liquid-cooled plate for the battery cell 02.

[0076] In some embodiments, the radius R1 of the second transition portion 27 satisfies 1 mm≦R2≦2 mm. For example, the radius of the second transition portion 27 may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. When R2<1 mm, the processing difficulty and processing cost of the second transition portion 27 increase, and when R2>2 mm, the thickness of the separator 2 increases. Therefore, by setting 1 mm≦R2≦2 mm, the processing cost of the separator 2 can be reduced while the thickness of the separator 2 can be reduced, which is advantageous for improving the cooling efficiency of the liquid-cooled plate for the battery cell 02.

[0077] In any one of the above embodiments, the height h of the separator 2 satisfies 5 mm≦h≦8 mm along the third direction Z. Specifically, the height of the separator 2 may be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc.

[0078] In this embodiment, when the height of the separator 2 is small, i.e., h<5mm, the processing difficulty of the separator 2 is high and the processing cost is also high. When the height of the separator 2 is large, i.e., h>8mm, the size of the separator 2 is large, the material cost of the separator 2 is high, and the overall height of the liquid-cooled plate is also increased, which is disadvantageous for installation and use of the liquid-cooled plate. Therefore, by setting 5mm≦h≦8mm, the processing difficulty and processing cost of the separator 2 are reduced, and the overall height of the liquid-cooled plate is reduced, which is advantageous for installation and use of the liquid-cooled plate.

[0079] In any one of the above embodiments, the liquid-cooled plate may be an integrated structure, so as to improve the overall structural strength of the liquid-cooled plate, or as shown in Fig. 2, the liquid-cooled plate includes a first plate 1c and a second plate 1d symmetrically distributed along the second direction X, and the structures of the first plate 1c and the second plate 1d are the same, so as to reduce the processing cost of the liquid-cooled plate. The central axis 15 is located at the connection position between the first plate body 1c and the second plate body 1d, the cooling channels 14 in the first plate body 1c and the cooling channels 14 in the second plate body 1d are distributed symmetrically with respect to the central axis 15 and are connected to each other, and the fourth separator 24 is located at the connection position between the first plate body 1c and the second plate body 1d, and is formed by connecting a separator 2 located on the central axis 15 on the first plate body 1c and a separator 2 located on the central axis 15 on the second plate body 1d so as to improve the connection stability between the first plate body 1c and the second plate body 1d.

[0080] The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention. [Explanation of symbols]

[0081] 01 Battery case 011 Lid plate 012 Bottom plate 02 Battery cell 1 Plate 11 Cooling chamber 12 Liquid inlet 13 Exudation opening 14 Cooling Channel 141 First Channel 142 Second Channel 15 Center axis 16 First side wall 17 Second side wall 18 Third Side Wall 19 Fourth Side Wall 1a Top wall 1b Bottom wall 1c 1st plate 1d Second plate 2. Separator 21 First separator 22 Second separator 23 Third separator 24 4th separator 25 Partition 26 1st transition part 27 Second transition part

Claims

1. A liquid-cooled plate, The device comprises a plate body (1) and a separator (2), A cooling chamber (11) is provided within the plate body (1), a liquid inlet (12) and a liquid outlet (13) are provided on the plate body (1), and the cooling chamber (11) communicates with the outside via the liquid inlet (12) and the liquid outlet (13); The separator (2) is attached to the plate body (1), and the separator (2) divides the cooling chamber (11) into a plurality of cooling flow paths (14) along a distribution direction of the liquid inlet (12) and the liquid outlet (13), and adjacent cooling flow paths (14) communicate with each other, A liquid cooling plate, characterized in that the separators (2) are distributed unevenly on the plate body (1).

2. The cooling flow path (14) includes at least a first flow path (141) and a second flow path (142), and a flow cross-sectional area of ​​the first flow path (141) is different from a flow cross-sectional area of ​​the second flow path (142), Along a distribution direction of the liquid inlet (12) and the liquid outlet (13), the first flow paths (141) are distributed symmetrically with respect to a central axis (15), and / or the second flow paths (142) are distributed symmetrically with respect to the central axis (15); 2. The liquid cooling plate according to claim 1, wherein the central axis (15) and the first direction (Y) form a predetermined angle.

3. A cross-sectional area of ​​the first flow path (141) is larger than a cross-sectional area of ​​the second flow path (142), The liquid cooling plate of claim 2, characterized in that along a distribution direction of the liquid inlet (12) and the liquid outlet (13), the liquid inlet (12) and the liquid outlet (13) are respectively connected to the first flow paths (141) on both sides of the central axis (15), and the second flow path (142) is located between the first flow path (141) and the central axis (15).

4. 2. The liquid cooling plate according to claim 1, wherein a cross-sectional area of ​​the cooling flow path (14) gradually decreases along a distribution direction of the liquid inlet (12) and the liquid outlet (13), and a cross-sectional area of ​​the cooling flow path (14) at the liquid outlet (13) is smaller than a cross-sectional area of ​​the cooling flow path (14) at the liquid inlet (12).

5. The plate body (1) includes a first side wall (16) and a second side wall (17) arranged opposite each other along the first direction (Y), The separator (2) includes a first separator (21) and a second separator (22), Along the extending direction of the separator (2), one end of the first separator (21) is connected to the first side wall (16), and a first gap exists between the other end of the first separator (21) and the second side wall (17), one end of the second separator (22) is connected to the second side wall (17), and a second gap exists between the other end of the second separator (22) and the first side wall (16), The liquid cooling plate according to any one of claims 1 to 4, characterized in that the first separators (21) and the second separators (22) are alternately distributed at intervals along a distribution direction of the liquid inlet (12) and the liquid outlet (13).

6. Along the extending direction of the separator (2), the length L1 of the first gap satisfies 0<L1≦44 mm, 6. The liquid cooling plate according to claim 5, wherein a length L2 of the second gap along an extending direction of the separator (2) satisfies 0<L2≦44 mm.

7. a thickness H1 of the first separator (21) in a direction perpendicular to the extending direction of the separator (2) and the thickness direction of the plate body (1) satisfies 3 mm≦H1≦5 mm; The liquid cooling plate according to claim 5, characterized in that in a direction perpendicular to the extension direction of the separator (2) and the thickness direction of the plate body (1), the thickness H2 of the second separator (22) satisfies 3 mm≦H2≦5 mm.

8. The separator (2) further includes a third separator (23), Along the extending direction of the separator (2), a third gap exists between one end of the third separator (23) and the first side wall (16), and a fourth gap exists between the other end of the third separator (23) and the second side wall (17); The liquid cooling plate according to claim 5, characterized in that at least a portion of the third separator (23) is located between the first separator (21) and the second separator (22) along the distribution direction of the liquid inlet (12) and the liquid outlet (13).

9. A length L3 of the third gap along the extending direction of the separator (2) satisfies 0<L3≦45 mm, 9. The liquid cooling plate according to claim 8, wherein a length L4 of the fourth gap along an extending direction of the separator (2) satisfies 0<L4≦16 mm.

10. The liquid cooling plate according to claim 8, characterized in that in a direction perpendicular to the extension direction of the separator (2) and the thickness direction of the plate body (1), the thickness H3 of the third separator (23) satisfies 3 mm≦H3≦5 mm.

11. The separator (2) includes a fourth separator (24), the fourth separator (24) being provided on the central shaft (15), The plate body (1) includes a first side wall (16) and a second side wall (17) arranged opposite each other along the first direction (Y), A fifth gap exists between one end of the fourth separator (24) and the first side wall (16) along the extending direction of the separator (2), and the other end of the fourth separator (24) is connected to the second side wall (17), or A sixth gap exists between one end of the fourth separator (24) and the second side wall (17) along the extending direction of the separator (2), and the other end of the fourth separator (24) is connected to the first side wall (16), or Along the extending direction of the separator (2), a fifth gap exists between one end of the fourth separator (24) and the first side wall (16), and a sixth gap exists between the other end of the fourth separator (24) and the second side wall (17); The liquid cooling plate according to any one of claims 1 to 4, characterized in that in a direction perpendicular to the extension direction of the separator (2) and the thickness direction of the plate body (1), a thickness H4 of the fourth separator (24) satisfies 7 mm≦H4≦8 mm.

12. The plate body (1) includes a top wall (1a) and a bottom wall (1b) disposed opposite each other along a thickness direction of the liquid-cooled plate, The separator (2) includes a partition (25), Along the thickness direction of the liquid cooling plate, a first transition portion (26) and a second transition portion (27) are provided at both ends of the partition body (25), the first transition portion (26) is connected to the top wall (1a), and the second transition portion (27) is connected to the bottom wall (1b); A liquid cooling plate as described in any one of claims 1 to 4, characterized in that in a direction perpendicular to the extension direction of the separator (2) and the thickness direction of the plate body (1), the thickness of the first transition portion (26) is greater than the thickness of the partition body (25), and the thickness of the second transition portion (27) is greater than the thickness of the partition body (25).

13. The liquid cooling plate of claim 12, characterized in that in a direction perpendicular to the extension direction of the separator (2) and the thickness direction of the plate body (1), the side wall of the first transition portion (26) is a straight surface or an arcuate surface, and the side wall of the second transition portion (27) is a straight surface or an arcuate surface.

14. A battery pack comprising: The battery comprises a battery case (01) and a plurality of battery cells (02); The battery case (01) includes a cover plate (011) and a bottom plate (012), the cover plate (011) and the bottom plate (012) surrounding a storage cavity; The battery cell (02) is mounted within the receiving cavity, The battery pack is characterized in that the bottom plate (012) is a liquid-cooled plate as described in any one of claims 1 to 4, or the liquid-cooled plate as described in any one of claims 1 to 4 is attached between the bottom plate (012) and the battery cell (02).

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