Lithium battery liquid cooling plate and lithium battery

Abstract

The utility model provides a lithium battery liquid cooling plate and a lithium battery. The lithium battery liquid cooling plate comprises a plate body, a liquid cooling channel is arranged in the plate body, and the liquid cooling channel is provided with a liquid inlet and a liquid outlet; and the fin group is arranged in the liquid cooling flow channel and is used for carrying out turbulent flow on the cooling liquid in the liquid cooling flow channel, the fin group comprises a plurality of sub-fins, and the extension directions of at least two sub-fins in the plurality of sub-fins are arranged at an angle. The lithium battery liquid cooling plate solves the problem of limited heat dissipation effect of the lithium battery liquid cooling plate in the prior art.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a lithium battery liquid cooling plate and a lithium battery. BACKGROUND

[0002] A new energy automobile power battery generates a large amount of heat in the process of charging and discharging. A battery thermal management system is responsible for dissipating heat to the environment in time, so that the battery can work in a proper temperature range, thereby prolonging the service life of the battery and ensuring the safety of the battery. The temperature of the battery rises during operation, and a cooling plate is needed to cool it down. However, the cooling efficiency of the current cooling plate is low, which causes the battery temperature to be too high or the temperature of each part to drop unevenly, especially the temperature of the cooling liquid at the outlet rises. However, only the liquid cooling method is used to cool the battery, and the cooling effect is limited, which cannot well achieve the cooling of the battery. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the application is to provide a lithium battery liquid cooling plate and a lithium battery to solve the problem of limited cooling effect of the lithium battery liquid cooling plate in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the application, a lithium battery liquid cooling plate is provided, which comprises: a plate body, the plate body has a liquid cooling flow channel therein, the liquid cooling flow channel has a liquid inlet and a liquid outlet; at least one fin group, the fin group is arranged in the liquid cooling flow channel and disturbs the cooling liquid in the liquid cooling flow channel, the fin group comprises a plurality of sub-fins, and the extension directions of at least two sub-fins in the plurality of sub-fins are arranged at an angle.

[0005] Further, the two adjacent sub-fins in the fin group abut each other; and / or the two adjacent sub-fins in the fin group are spaced apart to form a first flow gap therebetween.

[0006] Further, the plurality of sub-fins in the fin group are arranged in a ring shape; and / or the extension directions of the sub-fins in the fin group are all different.

[0007] Further, one end of each sub-fin in the fin group abuts the adjacent sub-fin, and the other end of each sub-fin in the fin group extends outward and forms a free end.

[0008] Further, one side of the plate body having the liquid inlet is a liquid inlet side, one side of the plate body having the liquid outlet is a liquid outlet side, and the fin group is arranged close to the liquid outlet side relative to the liquid inlet side.

[0009] Further, the number of fin groups is a plurality, one side of the plate body having the liquid inlet is a liquid inlet side, one side of the plate body having the liquid outlet is a liquid outlet side, at least one fin group is arranged close to the liquid outlet side relative to the liquid inlet side, and the remaining fin groups are arranged at any position of the liquid cooling flow channel.

[0010] Further, the liquid cooling flow channel comprises: an inlet flow channel in communication with the inlet; an outlet flow channel in communication with the outlet; and a plurality of sub-flow channels, each sub-flow channel having one end in communication with the inlet flow channel and at least one sub-flow channel having the other end in communication with the outlet flow channel, and at least one group of fins arranged in the sub-flow channel.

[0011] Further, the liquid cooling flow channel further comprises: a pair of side flow channels arranged on both sides of the plurality of sub-flow channels, each side flow channel having one end in communication with the inlet flow channel and the other end in communication with the outlet flow channel; and a connecting flow channel having one end in communication with the measuring flow channel and the other end in communication with the sub-flow channel.

[0012] Further, the extension direction of the sub-flow channel is arranged at an angle with respect to the length or width direction of the plate body, so that the sub-flow channels intersect and form a grid-shaped flow channel.

[0013] Further, the group of fins is arranged at the intersection position of the grid-shaped flow channel.

[0014] Further, the group of fins is arranged at the intersection position of the grid-shaped flow channel.

[0015] Further, the number of outlets is greater than the number of inlets; and / or the cross-sectional area of each outlet is smaller than the cross-sectional area of the inlet.

[0016] According to another aspect of the present application, a lithium battery is provided, comprising the above-mentioned lithium battery liquid cooling plate.

[0017] According to the technical solution of the present application, a lithium battery liquid cooling plate comprises a plate body and at least one group of fins, the cooling plate has a liquid cooling flow channel, the liquid cooling flow channel has an inlet and an outlet, the group of fins is arranged in the liquid cooling flow channel and disturbs the cooling liquid in the flow channel, the group of fins comprises a plurality of sub-fins, and the extension directions of at least two sub-fins of the plurality of sub-fins are arranged at an angle. The following technical effects are achieved:

[0018] When the cooling liquid in the liquid cooling flow channel flows through the group of fins, the sub-fins of the group of fins will disturb the flow of the cooling liquid due to the blocking effect of the sub-fins, increase the flow distance of the cooling liquid, and reduce the hydraulic loss of the cooling liquid, thereby increasing the convective heat transfer effect of cooling and achieving better cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the exemplary embodiments of the present application. The description of the present application set forth in the specification explain the present application, and do not limit the present application. In the drawings:

[0020] Figure 1A schematic diagram showing the internal structure of a plate body according to an embodiment of the present application is shown;

[0021] Figure 2 A schematic structural diagram of a fin assembly according to an embodiment of the present application is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Plate body; 20. Fin group; 21. Sub-fin; 30. Liquid cooling channel; 31. Liquid inlet channel; 32. Liquid outlet channel; 33. Sub-channel; 34. Side channel; 35. Connecting channel; 40. Liquid inlet; 50. Liquid outlet. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0026] In this application, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit this application.

[0027] In order to solve the problem of limited heat dissipation effect of lithium battery liquid cooling plates in the prior art, this embodiment provides a lithium battery liquid cooling plate and a lithium battery.

[0028] See also Figure 1 and Figure 2 A lithium battery liquid cooling plate includes a plate body 10 and at least one fin group 20. The cold plate has a liquid cooling channel 30. The liquid cooling channel 30 has a liquid inlet 40 and a liquid outlet 50. The fin group 20 is arranged in the liquid cooling channel 30 and turbulently controls the flow of the coolant in the liquid cooling channel 30. The fin group 20 includes a plurality of sub-fins 21. The extension directions of at least two of the plurality of sub-fins 21 are arranged at an angle.

[0029] When the coolant in the liquid cooling channel 30 flows through the fin group 20, the blocking effect of the sub-fins 21 of the fin group 20 will disturb the flow of the coolant gas channel, increase the flow distance of the coolant, and reduce the hydraulic loss of the coolant, thereby increasing the convective heat transfer effect of the cooling and achieving a better cooling effect.

[0030] Specifically, the sub-fin 21 itself can increase the heat exchange area of the cooling liquid with the outside world, and improve the heat dissipation effect of the cooling liquid in the liquid cooling flow channel 30. The main role of the fin group 20 is to play a spoiler effect. In this embodiment, the spoiler effect is achieved by setting the extension direction of at least two sub-fins 21 at an angle. However, the setting form of the sub-fin 21 is not limited to this, and the sub-fin 21 can be arranged at any position in the liquid cooling flow channel 30, and the flow of the cooling liquid in the liquid cooling flow channel 30 is at an angle. When the sub-fin 21 and the cooling liquid flow at an angle, the flowing cooling liquid will collide with the sub-fin 21, and the flow direction of the cooling liquid will change to a certain extent. After the expansion of the multiple cooling liquids flowing in different directions, the spoiler effect is generated, the flow distance of the cooling liquid is increased, the convective heat transfer effect of cooling is increased, and a better cooling effect is achieved. The greater the angle between the extension direction of the sub-fin 21 and the flow direction of the cooling liquid, the better the spoiler effect. The sub-fin 21 can be fixed at any position in the liquid cooling flow channel 30, can be fixed on the inner wall of the liquid cooling flow channel 30, or can be arranged in the gap between the liquid cooling flow channel 30 and the inner wall of the liquid cooling flow channel 30. At the same time, multiple sub-fins 21 can be arranged parallel to each other or at an angle to each other, as long as the spoiler effect of the flowing cooling liquid can be generated.

[0031] In one embodiment, the two adjacent sub-fins 21 in the fin group 20 abut each other. By abutting the two adjacent fins, the extension length of the fin group 20 can be increased to a certain extent, thereby improving the blocking effect of the cooling liquid in the liquid cooling flow channel 30, improving the spoiler effect of the cooling liquid of the fin group 20, and effectively improving the cooling effect.

[0032] In another embodiment, the two adjacent sub-fins 21 in the fin group 20 are spaced apart to form a first flow gap therebetween. By spacing the two sub-fins 21 to form a first flow gap, according to Bernoulli's equation, the size of the opening at the first flow gap position affects the flow rate of the cooling liquid passing through this position. When the flow rate of the cooling liquid at the first flow gap is different from the flow rate of the cooling liquid at other positions of the liquid cooling flow channel 30, the spoiler effect is also generated, the flow distance of the cooling liquid is increased by the spoiler, the convective heat transfer effect of cooling is increased, and a better cooling effect is achieved.

[0033] In this embodiment, the plurality of sub-fins 21 in the fin group 20 are arranged in a ring shape. By surrounding the plurality of sub-fins 21 in a ring structure, a single fin group 20 is formed as a whole, and during installation, the plurality of sub-fins 21 are spliced and installed to form the fin group 20, and then the fin group 20 is installed. This can facilitate the installation of the fin group 20 on the plate body 10.

[0034] Preferably, one end of each sub-fin 21 in the fin assembly 20 abuts against an adjacent sub-fin 21, and the other end of each sub-fin 21 in the fin assembly 20 extends outward to form a free end. By extending one end of the sub-fin 21 to form a free end, when the coolant flows through the fin assembly 20, the coolant can collide with the extended free end of the sub-fin 21, achieving a turbulent flow effect on the coolant, thereby achieving a better cooling effect.

[0035] In another embodiment, the sub-fins 21 in the fin assembly 20 extend in different directions. Since the sub-fins 21 extend in different directions, when the coolant in the liquid-cooling channel 30 contacts the sub-fins 21 extending in different directions, the coolant flows in the same direction across the sub-fins, thereby creating a turbulent flow and achieving a better cooling effect.

[0036] In this embodiment, the fin group 20 is spaced apart from the wall of the liquid-cooling channel 30 to form a second flow gap between the two. A gap is formed between the fin group 20 and the wall of the liquid-cooling channel 30, so that the fin group 20 is located in the middle of the liquid-cooling channel 30. When the coolant flows through the fin group 20, not only will the fin group 20 have a turbulent effect on the coolant, but the presence of the fin group 20 will also reduce the liquid flow diameter of the liquid-cooling channel 30 at this position, thereby changing the flow rate of the coolant. When the flow rates of some coolants are different, relative interference will occur between the coolants with different flow rates, thereby producing a turbulent effect. The superposition of the two turbulent effects can provide an overall turbulent effect for the fin group 20, thereby further increasing the flow range of the coolant, increasing the convective heat transfer effect of the cooling, and achieving a better cooling effect.

[0037] In one embodiment, at least a portion of the fin assembly 20 is connected to the wall of the liquid-cooling channel 30. By providing the fin assembly 20 on the wall of the liquid-cooling channel 30, the installation range of the fin assembly 20 can be increased, thereby enabling turbulence to occur at any position in the liquid-cooling channel 30, thereby enhancing the convective heat transfer effect of the cooling and achieving a better cooling effect.

[0038] In this embodiment, the side of the plate body 10 having the liquid inlet 40 is the liquid inlet side, the side of the plate body 10 having the liquid outlet 50 is the liquid outlet side, and the fin group 20 is arranged closer to the liquid outlet side relative to the liquid inlet side.

[0039] Specifically, since the cooling liquid in the liquid cooling flow channel 30 flows from the liquid inlet 40 to the liquid outlet 50, the temperature of the cooling liquid gradually increases with the absorption of heat during the heat dissipation process of the battery. In order to reduce the temperature difference between the liquid inlet 40 and the liquid outlet 50, the heat dissipation effect needs to be increased when the cooling liquid approaches the liquid outlet 50. The fins are arranged close to the liquid outlet side relative to the liquid inlet side, which can improve the heat dissipation effect of the cooling liquid at the liquid outlet side, thereby reducing the temperature difference between the liquid inlet side and the liquid outlet side, and making the cooling effect of the liquid cooling plate more uniform.

[0040] In another embodiment, the number of fin groups 20 is multiple, the plate body 10 has a liquid inlet side on which the liquid inlet 40 is located, and has a liquid outlet side on which the liquid outlet 50 is located. At least one fin group 20 is arranged close to the liquid outlet side relative to the liquid inlet side, and the remaining fin groups 20 are arranged at any position of the liquid cooling flow channel 30.

[0041] Specifically, since the cooling liquid in the liquid cooling flow channel 30 flows from the liquid inlet 40 to the liquid outlet 50, the temperature of the cooling liquid gradually increases with the absorption of heat during the heat dissipation process of the battery. Therefore, the temperature of the cooling liquid at the position close to the liquid outlet is relatively high. Therefore, when the fin groups 20 are multiple, at least one or multiple fin groups 20 need to be arranged at the outlet side of the liquid cooling flow channel 30 to reduce the temperature of the outlet side. The remaining fin groups 20 can be flexibly adjusted according to actual needs and arranged at any position of the liquid cooling flow channel 30, thereby improving the heat dissipation effect of the entire plate body 10.

[0042] In the present embodiment, the liquid cooling flow channel 30 includes a liquid inlet flow channel 31, a liquid outlet flow channel 32, and multiple sub-flow channels 33. The liquid inlet flow channel 31 communicates with the liquid inlet 40, the liquid outlet flow channel 32 communicates with the liquid outlet 50, one end of each sub-flow channel 33 communicates with the liquid inlet flow channel 31, the other end of at least one sub-flow channel 33 communicates with the liquid outlet flow channel 32, and at least one fin group 20 is arranged in the sub-flow channel 33.

[0043] Specifically, in order to facilitate the dispersion of the coolant discharged from the liquid inlet 40 in the liquid cooling channel 30, the liquid inlet channel 31 is in the shape of a "human", and the liquid inlet 40 is set in the middle position of the liquid inlet channel 31. The liquid inlet channel 31 is inclined in the direction close to the liquid outlet 50. In this way, the coolant in the liquid inlet channel 31 can be distributed as evenly as possible to multiple sub-channels 33 connected to the liquid inlet channel 31. Since the liquid outlet channel 32 is only responsible for liquid discharge, the liquid outlet channel 32 can be in any form. In this embodiment, it is an ordinary channel arranged along the width direction of the plate body 10. However, in order to improve the liquid discharge effect of the liquid outlet channel 32, multiple liquid outlets 50 can be set on the liquid outlet channel 32. The sub-channel 33 passes through most of the plate body 10 and plays a major role in heat dissipation. The number of sub-channels 33 should not be too many or too few. Too few will result in too little circulation volume and fail to achieve the required cooling effect; too many will result in too large a pressure drop of the coolant in the plate body 10, affecting the circulation speed of the coolant in the plate body 10 and never affecting the cooling effect.

[0044] In one embodiment, the liquid cooling channel 30 also includes side channels 34 arranged in pairs, and the two side channels 34 are respectively located on both sides of the multiple sub-channels 33. One end of the side channel 34 is connected to the liquid inlet channel 31, and the other end is connected to the liquid outlet channel 32, connecting the channel 35, one end of the connecting channel 35 is connected to the test channel, and the other end of the connecting channel 35 is connected to the sub-channel 33.

[0045] Specifically, the side channels 34 are primarily located on both sides of the plate 10, utilizing the unused space on both sides of the plate 10 so that the liquid-cooling channel 30 covers as much of the plate 10 as possible, thereby improving the heat dissipation effect. Similarly, the connecting channel 35 utilizes the unused space between the side channels 34 and the sub-channels 33, thereby ensuring that the liquid-cooling channel 30 covers as much of the plate 10 as possible, thereby improving the heat dissipation effect.

[0046] In this embodiment, the extension direction of the sub-channels 33 is arranged at an angle to the length or width direction of the plate body 10, so that the sub-channels 33 intersect and form a grid-like channel.

[0047] By arranging the sub-channels 33 at an angle to the length or width of the plate 10, the length of the sub-channels 33 can be increased, thereby increasing the flow path of the coolant, thereby enhancing the convective heat transfer effect and achieving a better cooling effect. Furthermore, because the sub-channels 33 intersect and form a grid-like flow channel, the sub-channels 33 have a maximum effective heat dissipation area, increasing the heat transfer effect and achieving a better cooling effect.

[0048] In another embodiment, the plurality of sub-flow channels 33 are arranged in parallel along the width of the plate body 10. Although this arrangement also enables a large effective heat dissipation area, the length of the sub-flow channels 33 is shorter than that of the arrangement in which the sub-flow channels 33 are arranged obliquely, and the heat exchange efficiency is limited.

[0049] In the present embodiment, the fin group 20 is arranged at the intersection of the grid-shaped flow channels.

[0050] Because the sub-flow channels 33 intersect and form grid-shaped flow channels, expansion occurs between two cooling liquids flowing in opposite directions at the grid intersection, which produces a certain degree of turbulence. Arranging the fin group 20 at this position can further increase the turbulence of the cooling liquid at this position, increase the flow distance of the cooling liquid, and reduce the hydraulic loss of the cooling liquid, thereby increasing the convective heat exchange effect of cooling and achieving better cooling.

[0051] In the present embodiment, the number of outlet openings 50 is greater than the number of inlet openings 40, and the cross-sectional area of each outlet opening 50 is smaller than that of the inlet opening 40.

[0052] Specifically, to ensure that the cooling liquid in the inlet flow channel 31 is in a dynamic balance, the volume of the cooling liquid entering the inlet opening 40 per unit time should be the same as or approximately equal to the flow rate of the cooling liquid flowing out of the outlet opening 50. Therefore, the cross-sectional area of the outlet opening 50 is smaller than or equal to that of the inlet opening 40. By arranging multiple outlet openings 50, the concentration of cooling liquid pressure at the outlet opening position can be avoided, so that the cooling liquid can be easily handled at the outlet opening position.

[0053] From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

[0054] 1. When the cooling liquid in the liquid cooling flow channel 30 flows through the fin group 20, the sub-fins 21 of the fin group 20 will disturb the flow of the cooling liquid, increase the flow distance of the cooling liquid, and reduce the hydraulic loss of the cooling liquid, thereby increasing the convective heat exchange effect of cooling and achieving better cooling.

[0055] 2. Because the cooling liquid in the liquid cooling flow channel 30 flows from the inlet opening 40 to the outlet opening 50, and as the battery cooling process continues, the temperature of the cooling liquid will gradually increase as heat is absorbed. To reduce the temperature difference between the inlet opening 40 and the outlet opening 50, the cooling effect needs to be increased when the cooling liquid approaches the outlet opening 50. Arranging the fins at a position closer to the outlet side relative to the inlet side can improve the cooling effect of the cooling liquid at the outlet side, thereby reducing the temperature difference between the inlet side and the outlet side and making the liquid cooling plate cooling more uniform.

[0056] 3. By arranging the sub-channels 33 at an angle to the length or width of the plate 10, the length of the sub-channels 33 can be increased, thereby increasing the flow path of the coolant, thereby enhancing the convective heat transfer effect and achieving better cooling. Furthermore, because the sub-channels 33 intersect and form a grid-like flow channel, the sub-channels 33 have a maximum effective heat dissipation area, increasing the heat transfer effect and achieving better cooling effect.

[0057] Obviously, the embodiments described above are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A lithium battery liquid cooling plate, characterized in that: include: A plate body (10), wherein the plate body (10) has a liquid cooling channel (30), and the liquid cooling channel (30) has a liquid inlet (40) and a liquid outlet (50); At least one fin group (20), the fin group (20) is arranged in a liquid cooling channel (30), the fin group (20) includes a plurality of sub-fins (21), and the extension directions of at least two of the plurality of sub-fins (21) are arranged at an angle.

2. The lithium battery liquid cooling plate according to claim 1, characterized in that: Two adjacent sub-fins (21) in the fin group (20) abut against each other; and / or Two adjacent sub-fins (21) in the fin group (20) are spaced apart to form a first flow gap therebetween.

3. The lithium battery liquid cooling plate according to claim 1, characterized in that: The plurality of sub-fins (21) in the fin group (20) are arranged in a ring shape; and / or The extension directions of the sub-fins (21) in the fin group (20) are different.

4. The lithium battery liquid cooling plate according to claim 3, characterized in that: One end of each sub-fin (21) in the fin group (20) abuts against the adjacent sub-fin (21), and the other end of each sub-fin (21) in the fin group (20) extends outward to form a free end.

5. The lithium battery liquid cooling plate according to claim 1, characterized in that: The side of the plate body (10) having the liquid inlet (40) is the liquid inlet side, the side of the plate body (10) having the liquid outlet (50) is the liquid outlet side, and the fin group (20) is arranged close to the liquid outlet side relative to the liquid inlet side.

6. The lithium battery liquid cooling plate according to claim 1, characterized in that: There are multiple fin groups (20), the side of the plate body (10) having the liquid inlet (40) is the liquid inlet side, the side of the plate body (10) having the liquid outlet (50) is the liquid outlet side, at least one of the fin groups (20) is arranged close to the liquid outlet side relative to the liquid inlet side, and the remaining fin groups (20) are arranged at any position of the liquid cooling channel (30).

7. The lithium battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The liquid cooling channel (30) comprises: a liquid inlet channel (31), the liquid inlet channel (31) communicating with the liquid inlet port (40); A liquid outlet channel (32), the liquid outlet channel (32) being connected to the liquid outlet port (50); a plurality of sub-channels (33), one end of each sub-channel (33) being connected to the liquid inlet channel (31), the other end of at least one sub-channel (33) being connected to the liquid outlet channel (32), and at least one group of fin groups (20) being arranged in the sub-channel (33).

8. The lithium battery liquid cooling plate according to claim 7, characterized in that: The liquid cooling channel (30) further comprises: Side flow channels (34) are arranged in pairs, with the two side flow channels (34) being located on both sides of the plurality of sub-flow channels (33), one end of the side flow channel (34) being in communication with the liquid inlet channel (31), and the other end being in communication with the liquid outlet channel (32); A connecting flow channel (35), one end of which is in communication with the side flow channel (34), and the other end of which is in communication with the sub-flow channel (33).

9. The lithium battery liquid cooling plate according to claim 7, characterized in that: The extension direction of the sub-channels (33) is arranged at an angle to the length or width direction of the plate body (10), so that the sub-channels (33) intersect and form a grid-like channel.

10. The lithium battery liquid cooling plate according to claim 9, characterized in that: The fin group (20) is arranged at the intersection of the grid-shaped flow channels.

11. The lithium battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The fin group (20) and the channel wall of the liquid cooling channel (30) are spaced apart to form a second flow gap therebetween; or At least a portion of the fin group (20) is connected to the channel wall of the liquid cooling channel (30).

12. The lithium battery liquid cooling plate according to any one of claims 1 to 6, characterized in that: The number of the liquid outlets (50) is greater than the number of the liquid inlets (40); and / or The aperture area of ​​each of the liquid outlets (50) is smaller than the aperture area of ​​the liquid inlet (40).

13. A lithium battery, characterized in that: The invention comprises the lithium battery liquid cooling plate according to any one of claims 1 to 12.

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