Liquid cooling plate and battery pack

Abstract

Some embodiments of the utility model disclose a liquid cooling plate, comprising a current collector, which is provided with a first current collecting cavity; the second flow collecting cavity is separated from the first flow collecting cavity, one of the first flow collecting cavity and the second flow collecting cavity is used as a liquid inlet cavity, and the other one is used as a liquid return cavity; the first flow dividing hole is communicated to the first flow collecting cavity; the second flow dividing hole is communicated to the second flow collecting cavity; wherein at least one side of the first flow collecting cavity is provided with a concave part which is sunken downwards relative to the first bottom wall of the first flow collecting cavity, the concave part is used for being connected with the first flow dividing hole, and the first flow dividing hole and the second flow dividing hole are both lower than the first bottom wall. The liquid cooling plate provided by the utility model is simple in structure and easy to process. Other embodiments of the utility model also provide a battery pack.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, provides a liquid cooling plate and a battery pack. Background Art

[0002] With the development of the new energy vehicle industry, batteries are widely used in new energy vehicles as power output devices. Batteries generate a lot of heat during operation. Since the performance of batteries is closely related to the operating temperature, too high or too low temperature will cause the battery performance to decline, and even cause safety accidents such as combustion and explosion. In order to prevent the heat generated during the operation of the battery from affecting the battery, the prior art usually adds a liquid cooling plate at the bottom of the battery cell to conduct the heat away in time, so as to control the operating temperature of the battery within an appropriate range.

[0003] However, the internal structure of the liquid cooling plate in the prior art is particularly complex, and it is difficult to process in practice, and the production efficiency is relatively low. Therefore, there is an urgent need for a liquid cooling plate with a simple structure. Utility Model Content

[0004] In view of the above problems existing in the prior art, the present application provides a liquid cooling plate with a simple structure.

[0005] According to one aspect of the present application, a liquid cooling plate is provided, comprising: a current collector, the current collector having: a first current collecting chamber; a second current collecting chamber, which is spaced apart from the first current collecting chamber, one of the first current collecting chamber and the second current collecting chamber being used as a liquid inlet chamber and the other being used as a liquid return chamber; a first diversion hole, which is connected to the first current collecting chamber; and a second diversion hole, which is connected to the second current collecting chamber; wherein at least one side of the first current collecting chamber has a recessed portion that is recessed downward compared to the first bottom wall of the first current collecting chamber, the recess is used to connect the first diversion hole, and the first diversion hole and the second diversion hole are both lower than the first bottom wall.

[0006] In one or more embodiments, the bottom and the top of the first diversion hole are located at the same height level as the bottom and the top of the second diversion hole, respectively.

[0007] In one or more embodiments, the liquid cooling plate further includes a cooling plate having a flow channel inside, and the first diversion hole is connected to the second diversion hole through the flow channel.

[0008] In one or more embodiments, the collector has two first diversion holes and two second diversion holes, the two first diversion holes are respectively located on opposite sides of the first collecting cavity, and the two second diversion holes are located between the two first diversion holes, the first diversion holes are a group of holes formed by multiple single holes, and the second diversion holes are a group of holes formed by multiple single holes.

[0009] In one or more embodiments, one of the two first flow diversion holes communicates with one of the two second flow diversion holes through a first S-shaped flow passage, and the other of the two first flow diversion holes communicates with the other of the two second flow diversion holes through a second S-shaped flow passage.

[0010] In one or more embodiments, the first manifold is a liquid inlet chamber, and the second manifold is a liquid return chamber.

[0011] In one or more embodiments, in a cross section perpendicular to the length direction of the first manifold, the recess is a concave semicircular hole.

[0012] In one or more embodiments, a length direction of the first manifold and a length direction of the second manifold are parallel to each other.

[0013] In one or more embodiments, in a cross section perpendicular to the length direction, the first manifold is L-shaped, and the second manifold is rectangular and is located below the first manifold.

[0014] According to another aspect of the present application, a battery pack is provided, which includes a battery cell and the above-mentioned liquid cooling plate located at the bottom of the battery cell.

[0015] The above technical solution of the present application makes at least one side of the first manifold have a recessed portion that is recessed downward compared to the first bottom wall of the first manifold, the recess is used to connect the first diverter hole, and the first diverter hole and the second diverter hole are both lower than the first bottom wall, so as to at least simplify the structure of the liquid cooling plate. In addition, it also makes the liquid cooling plate easier to process, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. It is worth noting that according to the standard practice of the industry, the various components are not drawn to scale and are only used for illustration purposes. In fact, for the clarity of discussion, the size of each component can be arbitrarily increased or reduced.

[0017] Figure 1 A schematic top view of a liquid cooling plate according to an embodiment of the present application is shown.

[0018] Figure 2 A three-dimensional schematic diagram of a current collector according to an embodiment of the present application is shown.

[0019] Figure 3 A schematic side view of a current collector according to an embodiment of the present application is shown.

[0020] Figure 4 A schematic side view of a current collector according to an embodiment of the present application is shown.

[0021] Figure 5 The current collector according to the embodiment of the present application is shown along Figure 4 Cross-sectional view along line AA.

[0022] Figure 6 The current collector according to the embodiment of the present application is shown along Figure 4 Cross-sectional view of line BB.

[0023] Figure 7 A schematic diagram showing the flow of liquid in a liquid cooling plate according to an embodiment of the present application is shown.

[0024] Figure 8 A cross-sectional view of a current collector according to another embodiment of the present application is shown.

[0025] Fig. 9 A schematic diagram of a current collector according to an embodiment of the present application when viewed from the first liquid joint and the second liquid joint is shown.

[0026] Fig.10 The embodiment according to the present application is shown Fig. 9 Cross-sectional view of the current collector along line CC.

[0027] Fig.11 A schematic diagram of a liquid cooling plate according to an embodiment of the present application is shown.

[0028] Fig.12 A schematic diagram of a current collector without a recess is shown. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0030] The following disclosure provides many different embodiments or examples for realizing different features of the provided subject matter. Specific examples of components and arrangements will be described below to simplify the present invention. Of course, these are merely examples and are not intended to limit the present invention. For example, in the following description, forming a first component above or on a second component may include an embodiment in which the first component and the second component are in direct contact, and may also include an embodiment in which an additional component is formed between the first component and the second component so that the first component and the second component may not be in direct contact. Moreover, the present invention may repeatedly refer to numbers and / or letters in various examples. This repetition is only for simplicity and clarity, and does not itself represent the relationship between the various embodiments and / or configurations discussed.

[0031] In addition, the embodiments in the present application and the features in the embodiments may be combined with each other in the absence of conflicts. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be understood that the specific structures shown in the drawings are only for the sake of convenience of explanation and are not intended to limit the present application. When describing a specific figure, other structures not described in the drawings may be provided according to actual needs and are not intended to limit the present application.

[0032] As the battery capacity of power batteries increases, the charging speed increases, and the output power increases, the heat generated by the batteries has also increased a lot compared to before, which has put more tests on the heat dissipation capacity of the battery thermal management system. Liquid cooling plates are widely used in batteries as an effective heat dissipation method to accurately control the operating temperature of the battery. Generally speaking, the liquid cooling plate includes a current collector and a cooling plate located on one side of the current collector. The current collecting chambers (such as the liquid inlet chamber and the liquid return chamber) of the current collector are connected to the cooling plate through the shunt holes located between the cavity and the cooling plate. In order to allow the liquid to pass to different current collecting chambers of the current collector, the shunt holes leading to different current collecting chambers need to be staggered up and down from each other. This not only makes the structure of the liquid cooling plate more complicated, but also it is not easy to control the position of the shunt holes when processing such staggered shunt holes on the thinner cross-section of the current collector, and the processing is more difficult.

[0033] In an embodiment of the present application, a liquid cooling plate with a simple structure is provided. By making at least one side of the first collecting chamber have a recessed portion for connecting the first diversion hole that is recessed downward compared to the first bottom wall of the first collecting chamber, and the first diversion hole and the second diversion hole are both lower than the first bottom wall, at least the structure of the liquid cooling plate is simplified.

[0034] Figure 1 FIG. 1 is a schematic top view of a liquid cooling plate 100 according to an embodiment of the present application. For the convenience of description, Figure 1 The flow channel 116 of the cooling plate 102 is schematically shown in FIG. Figure 2FIG. 4 is a perspective schematic diagram of a current collector 104 of a liquid cooling plate 100 according to an embodiment of the present application. Figure 1 and Figure 2 As shown, in some embodiments, the liquid cooling plate 100 includes: a current collector 104, the current collector 104 has a first manifold 106, and a second manifold 108 spaced apart from the first manifold 106 (see Figure 3 As shown in FIG. 1 ), a first flow diversion hole 110 connected to the first manifold 106, and a second flow diversion hole 112 connected to the second manifold 108, one of the first manifold 106 and the second manifold 108 is used as a liquid inlet chamber and the other is used as a liquid return chamber. At the same time, at least one side of the first manifold 106 has a recess 114 that is recessed downward compared to the first bottom wall 106b of the first manifold 106, and the recess 114 is used to connect the first flow diversion hole 110, and the first flow diversion hole 110 and the second flow diversion hole 112 are both lower than the first bottom wall 106b.

[0035] In order to more clearly show the first diverter hole 110 and the second diverter hole 112 below the first bottom wall 106b, Figure 4 1 shows a schematic side view of a current collector 104 according to an embodiment of the present application. Figure 5 and Figure 6 They are shown respectively Figure 4 A cross-sectional view of the current collector 104 at the positions of the first flow diversion hole 110 and the second flow diversion hole 112. Figure 5 As shown, the first diverter hole 110 is connected to the bottom of the recess 114. It is easy to understand that the first diverter hole 110 is lower than the first bottom wall 106b. Figure 6 As shown, the second diverter hole 112 passes through the portion of the current collector 104 located below the first bottom wall 106b and is connected to the second manifold 108, and the second diverter hole 112 is also lower than the first bottom wall 106b. Therefore, the liquid cooling plate 100 of the embodiment of the present application can be connected to the first diverter hole 110 through the recessed portion 114 that is recessed downward compared to the first bottom wall 106b, and at the same time, the first diverter hole 110 and the second diverter hole 112 are both lower than the first bottom wall 106b, which can avoid staggering the first diverter hole and the second diverter hole up and down, thereby at least making the structure of the liquid cooling plate 100 simple. In addition, since the first diverter hole 110 and the second diverter hole 112 are both lower than the first bottom wall 106b to avoid staggering the diverter holes up and down, the liquid cooling plate 100 of the embodiment of the present application is easy to process.

[0036] To explain in more detail, Fig.12 FIG. 1 shows a three-dimensional schematic diagram of a current collector without a recess 114. For ease of explanation, Fig.12 The same reference numerals in Figures 1 to 11 Same parts as in . Fig.12As shown, when there is no recess, in order to make the first diverter hole 110 and the second diverter hole 112 connected to the first manifold 106 and the second manifold 108 respectively, the first diverter hole 110 and the second diverter hole 112 need to be arranged staggered from top to bottom, and accordingly, at least the top of the first diverter hole 110 and the bottom of the second diverter hole 112 are respectively arranged higher than the first bottom wall 106b and lower than the first bottom wall 106b, which not only makes the structure of the liquid cooling plate more complicated, but also makes such staggered arrangement more difficult in the actual processing process. Therefore, compared with the liquid cooling plate without recess and the diverter holes arranged staggered from top to bottom, the liquid cooling plate 100 of the embodiment of the present application has a simple structure and is easy to process.

[0037] Return to reference Figure 1 to Figure 2 As shown, in some embodiments, the current collector 104 further includes a first liquid joint 118 and a second liquid joint 120 connected to the first manifold 106 and the second manifold 108, respectively, one of the first liquid joint 118 and the second liquid joint 120 is used as a liquid inlet joint, and the other is used as a liquid return joint. In some embodiments, the liquid cold plate 100 further includes a cooling plate 102 having a flow channel 116 therein, and the first diverter hole 110 is connected to the second diverter hole 112 through the flow channel 116. In some embodiments, the first manifold 106 is a liquid inlet cavity, and the second manifold 108 is a liquid return cavity. In this case, the liquid flows from the first liquid joint 118 into the first manifold 106, and flows into the flow channel 116 of the cooling plate 102 through the first diverter hole 110, and flows into the second diverter hole 112 through the flow channel 116, thereby flowing back to the second manifold 108, and flows out from the second liquid joint 120. In this embodiment, since the first diverter hole 110 is used for liquid to flow into the cooling plate 102, and the second diverter hole 112 is used for liquid to flow back to the current collector 104, the first diverter hole 110 and the second diverter hole 112 can also be used as a liquid inlet channel and a liquid return channel, respectively. In other embodiments, the first collecting chamber 106 can be a liquid return chamber, and the second collecting chamber 108 can be a liquid inlet chamber. In this case, the first diverter hole 110 and the second diverter hole 112 are used as a liquid return channel and a liquid inlet channel, respectively. In some embodiments, the current collector 104 and the cooling plate 102 are connected together by welding.

[0038] For ease of description, in the following, the width direction of the liquid cooling plate 100 (i.e., the length direction of the current collector 104) is referred to as the first direction Y, the length direction of the liquid cooling plate 100 (i.e., the width direction of the current collector 104) is referred to as the second direction X, and the height direction of the liquid cooling plate 100 is referred to as the third direction Z. Figure 2As shown, in some embodiments, the bottom and top of the first diverter hole 110 and the bottom and top of the second diverter hole 112 are respectively located at the same height level. That is, the first diverter hole 110 and the second diverter hole 112 can be located on a plane at the same horizontal height. In detail, the first diverter hole 110 and the second diverter hole 112 are arranged along the first direction Y. Under ideal conditions, the lowest point of the first diverter hole 110 and the lowest point of the second diverter hole 112 are located at the same height in the third direction Z, and the highest point of the first diverter hole 110 and the highest point of the second diverter hole 112 are also located at the same height in the third direction Z. In some embodiments, the first diverter hole 110 and the second diverter hole 112 are multiple (for example Figure 1 and Figure 2 A group of holes is formed by six (six) single holes shown in the figure. Multiple single holes in a group of holes are arranged along the first direction Y and spaced apart by a first distance, and the first diverter hole 110 and the second diverter hole 112 arranged along the first direction Y are spaced apart by a second distance (that is, the distance between the single hole of the first diverter hole 110 closest to the second diverter hole 112 and the single hole of the second diverter hole 112 closest to the first diverter hole 110), and the second distance is much greater than the first distance. When the first diverter hole 110 is a group of holes formed by multiple single holes, it is not difficult to understand that a single recess 114 is connected to the group of holes. In some other embodiments, the first diverter hole 110 and the second diverter hole 112 can be formed by only one single hole respectively. Although the single hole is shown as a square hole in the figure, the present application is not limited to this, and the single hole can be any suitable shape, such as a round hole, a square hole, etc.

[0039] In a further embodiment where the first flow diverter hole 110 is a group of holes formed by multiple single holes, and the second flow diverter hole 112 is also a group of holes formed by multiple single holes, the current collector 104 has two first flow diverter holes 110 and two second flow diverter holes 112, the two first flow diverter holes 110 are respectively located on opposite sides of the first manifold 106 in the first direction Y, and the two second flow diverter holes 112 are located between the two first flow diverter holes 110. In this case, there are recesses 114 on opposite sides of the first manifold 106, and the two recesses 114 are respectively connected to the two first flow diverter holes 110.

[0040] In a further embodiment where the first manifold 106 is a liquid inlet chamber and the second manifold 108 is a liquid return chamber, Figure 7 A schematic diagram showing the flow of liquid in the liquid cooling plate 100 according to an embodiment of the present application is shown, with reference to FIG. Figures 1 to 7, one of the two first diverter holes 110 is connected to one of the two second diverter holes 112 through the first S-shaped flow channel 116a in the flow channel 116, and the other of the two first diverter holes 110 is connected to the other of the two second diverter holes 112 through the second S-shaped flow channel 116b in the flow channel 116, that is, the liquid enters the cooling plate 102 from both sides and returns from the middle. It is not difficult to understand that the two first diverter holes 110 are respectively connected to the second diverter hole 112 closer to themselves via the flow channel 116. In this embodiment, since the first S-shaped flow channel 116a and the second S-shaped flow channel 116b are connected in parallel in the cooling plate 102 of the liquid cooling plate 100, the liquid cooling plate 100 of this design can be called a double S-shaped flow channel parallel liquid cooling plate. Although Figure 7 As shown in the figure, a first S-shaped flow channel 116a and a second S-shaped flow channel 116b are provided in parallel in the cooling plate 102. However, the present application is not limited thereto. Only a single S-shaped flow channel and more than two parallel flow channels may be provided in the cooling plate 102.

[0041] Generally speaking, compared with designing only a single S-shaped flow channel and designing multiple parallel flow channels in the cooling plate 102, the liquid cooling plate 100 with double S-shaped flow channels in parallel can not only reduce the temperature difference and flow resistance of the liquid inlet and outlet, but also reduce the complexity of the structure. In detail, with the increase of power battery capacity, the improvement of charging speed, the improvement of output power, etc., the size of the battery pack and the liquid cooling plate also increases accordingly, and the corresponding flow channel length is further increased. Therefore, if only a single S-shaped flow channel is designed, not only will the flow resistance of the liquid in the cooling plate 100 increase, but also the temperature difference of the liquid inlet and outlet will further increase, that is, the temperature of the liquid away from the liquid inlet is higher, and the temperature of the liquid close to the liquid inlet is lower, which will affect the performance of the battery. In addition, if multiple parallel flow channels are designed, the design of multiple parallel flow channels in the liquid cooling plate 100 is more complicated. Therefore, the liquid cooling plate 100 with double S-shaped flow channels in parallel can not only reduce the temperature difference and flow resistance of the entire battery pack, but also simplify the complexity of the design of multiple parallel flow channels.

[0042] Next reference Figure 2 and Figure 3As shown, in the cross section perpendicular to the length direction of the first collecting chamber 106 (i.e., the first direction Y), the recess 114 is a concave semicircular hole. Designing the recess 114 as a semicircular hole can further reduce the difficulty of manufacturing. However, the recess 114 can also be set to other suitable shapes. In some embodiments, the length direction of the first collecting chamber 106 and the length direction of the second collecting chamber 108 are parallel to each other. That is, the first collecting chamber 106 and the second collecting chamber 108 both extend along the first direction Y, and the two are parallel to each other. In some embodiments, the first collecting chamber 106 runs through the entire length of the collector 104, and the length of the second collecting chamber 108 is less than the length of the first collecting chamber 106, that is, the relative sides of the second collecting chamber 108 are recessed inward by a distance compared to the relative sides of the first collecting chamber 106. For example Figure 3 and Figure 5 As shown, Figure 3 FIG. 1 shows that the second manifold 108 is recessed inward from one side of the first manifold 106, and because the second manifold 108 is shorter than the first manifold 106, Figure 5 In the cross-sectional view of FIG. 1 , the second manifold 108 is not shown. Although the opposite sides of the second manifold 108 are recessed inwardly compared to the opposite sides of the first manifold 106, in some embodiments, the second manifold 108 still has a portion overlapping with the first diversion hole 110, for example, see Figure 8 As shown, Figure 8 A cross-sectional view of the overlapping portion of the current collector according to an embodiment of the present application is shown. Figure 8 The second manifold 108 is shown in the cross-sectional view of FIG. Figure 8 As shown, in a further embodiment, in a cross section perpendicular to the length direction of the first manifold 106 (i.e., the second direction X), the first manifold 106 is L-shaped, and the second manifold 108 is rectangular and is located below the first manifold 106. Compared with the second manifold 108, the L-shaped first manifold 106 is closer to the cooling plate 102, and the rectangular second manifold 108 is located in the L-shaped notch below the L-shaped first manifold 106 to form an L-shaped staggered arrangement. However, the present application is not limited thereto, and in a cross section perpendicular to the length direction of the first manifold 106 (i.e., the second direction X), the first manifold 106 and the second manifold 108 can also be arranged in an up-and-down arrangement, a front-and-back arrangement, or a staggered distribution of other shapes.

[0043] Fig. 9 1 is a schematic diagram showing the current collector 104 according to an embodiment of the present application when viewed from the first liquid joint 118 and the second liquid joint 120, Fig.10 The embodiment according to the present application is shown Fig. 9The cross-sectional view of the current collector 104 along the CC line. Since the opposite sides of the second current collecting cavity 108 are recessed inwards by a certain distance compared with the opposite sides of the first current collecting cavity 106, Fig. 9 Notches 122 are formed on opposite sides of Fig.10 The cross-sectional view shows a first diverter hole 110 and a second diverter hole 112 connected to the first manifold 106 and the second manifold 108 respectively. The two first diverter holes 110 are respectively located on opposite sides of the first manifold 106, and the two second diverter holes 112 are located between the two first diverter holes 110. Fig.11 1 shows a schematic diagram of a liquid cooling plate 100 according to an embodiment of the present application. Fig.11 The liquid cooling plate 100 is shown after installation is completed.

[0044] According to another aspect of the present application, a battery pack is provided, which includes a battery cell and the above-mentioned liquid cooling plate 100 located at the bottom of the battery cell.

[0045] The liquid cooling plate 100 provided by the utility model is connected to the first diverter hole 110 through the concave portion 114 that is concave downward compared to the first bottom wall 106b, and the first diverter hole 110 and the second diverter hole 112 are both lower than the first bottom wall 106b, which at least makes the structure of the liquid cooling plate 100 simple, and also makes the liquid cooling plate 100 easy to process. In addition, by setting the flow channel 116 in the cooling plate 102 as a double S-shaped flow channel in parallel, not only can the temperature difference and flow resistance of the liquid inlet and outlet be reduced, but also the complexity of the design of multiple parallel flow channels can be simplified.

[0046] It should be understood that the various features of the various embodiments of the present application can be replaced and combined. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any combination of the various embodiments within the spirit and principle of the present application, as well as any modification, equivalent replacement, improvement, etc. made to the embodiments, shall be included in the protection scope of the present application.

Claims

1. A liquid cooling plate, characterized in that: include: A current collector, the current collector comprising: a first manifold; A second manifold, spaced apart from the first manifold, wherein one of the first manifold and the second manifold is used as a liquid inlet chamber and the other is used as a liquid return chamber; a first flow diversion hole, the first flow diversion hole being connected to the first manifold; and a second flow diversion hole, the second flow diversion hole being connected to the second manifold; At least one side of the first manifold has a recessed portion that is sunken downward compared to the first bottom wall of the first manifold, the recessed portion is used to connect the first diverter hole, and the first diverter hole and the second diverter hole are both lower than the first bottom wall.

2. The liquid cooling plate according to claim 1, characterized in that: The bottom and the top of the first diversion hole are respectively located at the same height level as the bottom and the top of the second diversion hole.

3. The liquid cooling plate according to claim 1, characterized in that: It also includes a cooling plate having a flow channel inside, and the first diversion hole is connected to the second diversion hole through the flow channel.

4. The liquid cooling plate according to claim 3, characterized in that: The current collector has two first diversion holes and two second diversion holes, the two first diversion holes are respectively located on opposite sides of the first collecting cavity, and the two second diversion holes are located between the two first diversion holes, the first diversion holes are a group of holes formed by multiple single holes, and the second diversion holes are a group of holes formed by multiple single holes.

5. The liquid cooling plate according to claim 4, characterized in that: One of the two first flow diversion holes communicates with one of the two second flow diversion holes through a first S-shaped flow channel in the flow channel, and the other of the two first flow diversion holes communicates with the other of the two second flow diversion holes through a second S-shaped flow channel in the flow channel.

6. The liquid cooling plate according to any one of claims 1 to 5, characterized in that: The first manifold is a liquid inlet chamber, and the second manifold is a liquid return chamber.

7. The liquid cooling plate according to claim 1, characterized in that: In a cross section perpendicular to the length direction of the first manifold, the recess is a concave semicircular hole.

8. The liquid cooling plate according to claim 1, characterized in that: A length direction of the first manifold and a length direction of the second manifold are parallel to each other.

9. The liquid cooling plate according to claim 8, characterized in that: In a cross section perpendicular to the length direction, the first manifold is L-shaped, and the second manifold is rectangular and is located below the first manifold.

10. A battery pack, characterized in that: It comprises a battery cell and a liquid cooling plate located at the bottom of the battery cell, wherein the liquid cooling plate is the liquid cooling plate according to any one of claims 1 to 9.

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