CN219163479U

CN219163479U - Liquid cooling plate and battery pack liquid cooling system

Info

Publication number: CN219163479U
Application number: CN202223107518.4U
Authority: CN
Inventors: 汪展展; 田远伟; 周校; 肖鹏
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-06-09
Anticipated expiration: 2032-11-22

Abstract

The utility model discloses a liquid cooling plate, which comprises a runner plate and a cold plate, wherein a runner groove is formed in the runner plate in a punching mode, and a plurality of turbulent blind windows are formed in the runner groove; one end face of the cold plate is adhered to the runner plate and seals the runner groove to form a runner, and cooling liquid flows in the runner; the other end face of the cold plate is used for contacting with the battery module for heat exchange. The cooling liquid is fluid with nano particles, and the nano particles are metal particles with high heat conductivity coefficient. Therefore, by arranging a plurality of turbulent blind windows in the runner groove, the heat exchange area of the runner groove is increased, the fluid flow boundary sense is destroyed, the disturbance of fluid flowing in the runner groove is enhanced, the fluid can be fully mixed, and the heat dissipation efficiency is further improved. In addition, by adding nano particles with good heat conduction performance into the fluid, the heat conduction coefficient of the fluid is increased, and the heat exchange effect is further improved. In addition, the utility model also provides a battery pack liquid cooling system with the liquid cooling plate.

Description

Liquid cooling plate and battery pack liquid cooling system

Technical Field

The utility model relates to the technical field of battery cooling, in particular to a liquid cooling plate and a battery pack liquid cooling system.

Background

At present, the power battery of the new energy automobile is mainly cooled in a liquid cooling mode, and the common setting mode is to set the liquid cooling plate below or on the side face of the power battery and contact the liquid cooling plate, and the heat exchange is carried out between the liquid cooling plate and the liquid cooling plate through the flow of cooling liquid in the liquid cooling plate, so that the heat of the power battery is taken away under a high-temperature working condition, the power battery is ensured to work at the optimal working temperature, and the potential safety hazard of the power battery is further reduced.

However, as the requirements on the battery pack space energy density are higher and higher, the traditional liquid cooling plate faces larger and larger heat dissipation load, and the requirements on the heat dissipation capacity of the liquid cooling plate are higher and higher. At present, the cooling liquid flow channel structure of most liquid cooling plates is single, and the heat exchange area is limited, so that the heat dissipation efficiency is low. For this reason, some merchants are through setting up the vortex effect that the vortex structure is in order to improve the coolant liquid on the runner, and then improve heat exchange efficiency, a liquid cooling board as disclosed in patent number CN216698512U, it includes bottom plate and panel, the bottom plate is formed with the runner, be provided with a plurality of vortex convex parts in the runner, the upper surface of a plurality of vortex convex parts relative runner is protruding and with the lower face contact of panel. Therefore, although the flow form of the cooling liquid can be changed by the plurality of turbulence convex parts, the cooling liquid is fully mixed, and the heat exchange efficiency is improved, as the turbulence convex parts are arranged in the flow channel, the volume of the flow channel is occupied, the flow entering the flow channel is reduced, and meanwhile, the heat exchange area of the panel is reduced after the turbulence convex parts are contacted with the panel, so that the heat exchange effect is greatly reduced.

In addition, the existing liquid cooling plate heat exchange working medium generally adopts glycol aqueous solution, and has lower heat conductivity coefficient and can not achieve better heat exchange effect.

Therefore, it is desirable to provide a liquid cooling plate and a battery pack liquid cooling system to solve the above problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides the liquid cooling plate and the battery pack liquid cooling system, and the turbulent blind window is arranged in the liquid cooling plate and the nanofluid is adopted as a heat exchange working medium, so that the heat exchange capacity is improved, and the heat dissipation effect is improved.

The utility model adopts the technical proposal for solving the problems that:

a liquid cooling plate comprising:

the flow channel plate is internally stamped with a flow channel groove, and a plurality of turbulent blind windows are arranged on the flow channel groove;

a cold plate, one end surface of which is adhered to the runner plate and seals the runner groove to form a runner, and a cooling liquid flows in the runner; the other end face of the cold plate is used for contacting with the cell module to conduct heat;

the cooling liquid is fluid with nano particles, and the nano particles are metal particles with high heat conductivity coefficient.

According to the liquid cooling plate, the flow channel grooves are provided with the plurality of turbulent blind windows, so that compared with the traditional turbulent protrusions, the liquid cooling plate does not occupy the volume of the flow channel grooves, and meanwhile, the heat exchange area of the flow channel grooves is increased, so that the flow of fluid entering the flow channel grooves is more, and the heat exchange efficiency is improved; in addition, the fluid flow state can be changed through the plurality of turbulent blind windows, disturbance of fluid in the flow channel groove is enhanced, the fluid can be fully mixed, and then the heat exchange effect is improved. In addition, by adding nano particles with good heat conduction performance into the fluid, the heat conduction coefficient of the fluid is greatly increased, and the heat exchange effect is further improved.

Further, the turbulent blind window is a groove formed on the side part of the runner groove, and a plurality of grooves are arranged at intervals along the flowing direction of the cooling liquid.

Therefore, the position arrangement of the turbulent blind windows can be flexibly arranged according to the temperature distribution of the battery cell module, so that the heat exchange effect is improved, the battery cell module is prevented from being damaged due to overhigh local temperature, and the temperature consistency of the battery cell module is ensured.

Further, the grooves are rectangular, circular or triangular.

Further, the nanoparticle is rod-shaped or long-strip-shaped.

Thus, by arranging the nanoparticles in a rod shape or a long strip shape, disturbance in fluid flow can be increased, and heat exchange efficiency can be improved.

Further, the runner plate or the cold plate is provided with a liquid inlet and a liquid outlet which are communicated with the runner groove and are respectively positioned at two sides, wherein:

the runner groove comprises a liquid inlet main channel communicated with the liquid inlet, a liquid outlet main channel which is arranged at intervals with the liquid inlet main channel and communicated with the liquid outlet, and a branch channel which is arranged between the liquid inlet main channel and the liquid outlet main channel and communicated with the liquid outlet main channel and the liquid outlet main channel, wherein the liquid inlet main channel, the liquid outlet main channel and the branch channel form a parallel channel.

Therefore, the runner grooves are designed into parallel grooves, so that fluid can uniformly flow into each groove, the flow uniformity of the fluid is improved, and the cooling effect of the liquid cooling plate is further improved.

Further, the branch channel comprises a plurality of first linear channels which are arranged at intervals in parallel and extend along the length direction of the flow channel plate, and at least two second linear channels which are arranged at intervals in parallel and extend along the width direction of the flow channel plate;

at least two second straight-line flow channels are respectively arranged at two ends of the first straight-line flow channels and are communicated with the first straight-line flow channels to form parallel flow channels.

Further, the liquid inlet main channel is a third linear channel extending along the length direction of the flow channel plate and arranged in parallel with the first linear channel, and one end of the third linear channel is communicated with one end of at least one second linear channel.

Further, the liquid outlet main channel is a fourth linear channel extending along the length direction of the flow channel plate and arranged in parallel with the first linear channel, and one end of the fourth linear channel is communicated with one end of at least one other second linear channel.

Further, the width of the branch channel is larger than the widths of the liquid inlet main channel and the liquid outlet main channel.

From this, through the channel of different width of design, can realize the fluid flow in the adjustment channel to can arrange its channel in a flexible way according to the temperature distribution of electric core module, and then improve its heat transfer effect, realize even heat dissipation.

In addition, the utility model also provides a battery pack liquid cooling system, which comprises the battery cell module and the liquid cooling plate, wherein the liquid cooling plate is arranged at one end of the battery cell module.

In summary, the liquid cooling plate and the battery pack liquid cooling system provided by the utility model have the following beneficial effects:

(1) According to the liquid cooling plate, the flow channel grooves are internally provided with the plurality of turbulent blind windows, so that compared with the traditional turbulent protrusions, the liquid cooling plate does not occupy the volume of the flow channel grooves, and meanwhile, the heat exchange area of the flow channel grooves is increased, so that the flow of fluid entering the flow channel grooves is more, and the heat exchange efficiency is improved; in addition, the fluid flow state can be changed through the plurality of turbulent blind windows, disturbance of fluid in the flow channel groove is enhanced, the fluid can be fully mixed, and then the heat exchange effect is improved. In addition, by adding nano particles with good heat conduction performance into the fluid, the heat conduction coefficient of the fluid is greatly increased, and the heat exchange effect is further improved.

(2) According to the liquid cooling plate disclosed by the utility model, the position distribution of the turbulent blind window can be flexibly adjusted according to the temperature distribution of the battery cell module, so that the heat exchange effect is improved, the battery cell module is prevented from being damaged due to overhigh local temperature, and the temperature consistency of the battery cell module is ensured.

(3) According to the liquid cooling plate, the nano particles are arranged in the shape of a rod or a strip, so that disturbance in fluid flow can be increased, and heat exchange efficiency is improved.

(4) According to the liquid cooling plate, the runner grooves are designed into the parallel grooves, so that fluid can uniformly flow into each groove, the flow uniformity of the fluid is improved, and the cooling effect of the liquid cooling plate is further improved.

(5) According to the liquid cooling plate, through designing the channels with different widths, the fluid flow in the channels can be adjusted, the channels of the liquid cooling plate can be flexibly distributed according to the temperature distribution of the battery cell module, the heat exchange effect of the liquid cooling plate is improved, and uniform heat dissipation is realized.

(6) The battery pack liquid cooling system has better cooling effect by adopting the liquid cooling plate, can improve energy density and simplify structure.

Drawings

FIG. 1 is an exploded view of a liquid cooling plate according to the present utility model;

FIG. 2 is a schematic view of the structure of a flow path plate in the liquid cooling plate according to the present utility model;

FIG. 3 is a schematic diagram of a liquid cooling plate according to the present utility model;

fig. 4 is a schematic diagram of a liquid cooling system for a battery pack according to the present utility model.

Wherein the reference numerals have the following meanings:

1. a flow channel plate; 11. a flow channel groove; 111. a first linear flow passage; 112. a second linear flow path; 113. a third linear flow path; 114. a fourth linear flow path; 12. a groove; 13. a liquid inlet; 14. a liquid outlet; 2. a cold plate; 3. a battery cell module; 31. a cylindrical cell;

the length direction of the X-flow channel plate; the width direction of the Y-flow channel plate;

d1-width of the first linear flow channel; d2—the width of the third linear flow channel; d3-width of the fourth linear flow channel.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Example 1

Firstly, the utility model provides a liquid cooling plate for cooling a cell module 3, when the cell module 3 is cooled by using the liquid cooling plate, the liquid cooling plate is placed right above the cell module 3, and the lower end surface of the liquid cooling plate is attached to the upper end surface of the cell module 3 to realize heat conduction. Referring to fig. 1 to 3, the liquid cooling plate includes a flow path plate 1 and a cold plate 2, and the cold plate 2 is disposed below the flow path plate 1 and is connected to the flow path plate 1. Specifically, a runner groove 11 is formed in the runner plate 1 by punching, the runner groove 11 is concavely arranged relative to the lower surface of the runner plate 1, the upper end surface of the cold plate 2 is adhered to the runner plate 1 and seals the runner groove 11 to form a runner, and a cooling liquid flows in the runner; the lower end surface of the cold plate 2 is attached to the cell module 3 to realize heat exchange.

Therefore, heat generated by the battery cell module 3 can be transferred to the cold plate 2 and then absorbed by cooling liquid circularly flowing in a runner above the cold plate 2, so that the battery cell module 3 can be continuously cooled, the battery cell module 3 can be ensured to work at the optimal working temperature, and the potential safety hazard of a power battery is reduced.

In the present embodiment, the flow path plate 1 and the cold plate 2 are integrally welded by brazing. Of course, in other embodiments, it may be fixed by connection, which is not limited herein.

Referring to fig. 2, preferably, the runner groove 11 is further provided with a plurality of turbulence blind windows, the turbulence blind windows are grooves 12 formed on the side of the runner groove 11, the grooves 12 are concavely disposed relative to the top surface of the upper surface of the runner plate 1, and the depth of the concave is smaller than that of the runner groove 11, i.e. the groove depth of the grooves 12 is smaller than that of the runner groove 11; in addition, the grooves 12 are arranged at intervals along the flowing direction of the cooling liquid, and the positions of the turbulent blind windows can be flexibly arranged according to the temperature distribution of the cell module 3 so as to achieve the optimal heat exchange effect.

Therefore, by arranging a plurality of turbulent blind windows on the side part of the runner groove 11, the heat exchange area of the runner groove 11 is increased, so that the fluid flow entering the runner groove is more, meanwhile, the fluid flow boundary sense is destroyed, the disturbance of the fluid in the runner groove 11 during the flow is enhanced, the fluid can be fully mixed, and the heat dissipation efficiency is further improved. In addition, the position arrangement of the grooves 12 can be flexibly arranged according to the temperature distribution of the cell module 3, so that the heat exchange effect is improved, the cell module 3 is prevented from being damaged due to overhigh local temperature, and the temperature consistency of the cell module 3 is ensured.

In this embodiment, the turbulent blind windows are intensively distributed in the middle position of the runner groove 11, the position corresponds to the central area of the battery core module 3, and the temperature of the central area of the battery core module 3 is highest, so that the heat exchange efficiency can be improved by arranging a plurality of turbulent blind windows in the position, thereby achieving a better heat dissipation effect.

In this embodiment, the runner groove 11 and the groove 12 are formed by a stamping process, and the stamping depths of the runner groove and the groove are different. Of course, in other embodiments, the depth of the groove 12 may be the same as the depth of the runner groove 11, i.e. the bottom surface of the groove 12 is flush with the bottom surface of the runner groove 11; meanwhile, the length and width of the groove 12 can be flexibly adjusted, so long as the good heat exchange effect can be met, and the heat exchange device is not limited.

In this embodiment, the recess 12 is rectangular; of course, in other embodiments, it may have other shapes such as a circle, triangle, oval, etc., which are not limited herein.

Further, the cooling liquid in the utility model is a fluid added with nano particles, the nano particles are metal particles with high heat conductivity coefficient, such as copper, silver and other metals, and the nano particles are in a rod shape or a strip shape.

Therefore, by adding nano particles with good heat conduction performance into the fluid, the heat conduction coefficient of the fluid is greatly increased, and the heat exchange effect is further improved; by changing the shape of the nanoparticles, turbulence in the fluid flow can be increased, thereby improving heat exchange efficiency.

In this example, the coolant is an aqueous glycol solution to which metal particles are added. Of course, in other embodiments, water may be used as the heat exchange medium, which is not limited herein.

Referring to fig. 2, the runner plate 1 is further provided with a liquid inlet 13 and a liquid outlet 14, which are communicated with the runner groove 11 and are respectively located at two sides, the runner groove 11 comprises a liquid inlet main channel, a liquid outlet main channel and a branch channel, the liquid inlet main channel is communicated with the liquid inlet 13, the liquid outlet main channel is arranged at intervals with the liquid inlet main channel and is communicated with the liquid outlet 14, the branch channel is arranged between the liquid inlet main channel and the liquid outlet main channel and is communicated with the liquid inlet main channel and the liquid outlet main channel, and the liquid inlet main channel, the liquid outlet main channel and the branch channel form a parallel channel.

Specifically, X in the drawing indicates the longitudinal direction of the flow field plate 1, and Y indicates the width direction of the flow field plate 1. The branch channel comprises three first linear channels 111 which are arranged at intervals in parallel and extend along the length direction (X direction) of the flow channel plate 1, and two second linear channels 112 which are arranged at intervals in parallel and extend along the width direction (Y direction) of the flow channel plate 1, wherein the two second linear channels 112 are respectively arranged at two ends of the three first linear channels 111 and are communicated with the two first linear channels to form parallel flow channels; the liquid inlet main channel is a third linear channel 113 extending along the length direction (X direction) of the flow channel plate 1 and arranged parallel to the first linear channel 111, and one end of the third linear channel 113 is communicated with one end of a second linear channel 112; the liquid outlet main channel is a fourth linear channel 114 extending along the length direction (X direction) of the flow channel plate 1 and parallel to the first linear channel 111, and one end of the fourth linear channel 114 is communicated with one end of the other second linear channel 112.

Therefore, the runner grooves 11 are designed to be parallel channels, so that fluid can uniformly flow into each channel, the flow uniformity of the fluid is improved, and the cooling effect of the liquid cooling plate is further improved.

In this embodiment, the liquid inlet 13 is disposed at an end of the third linear flow channel 113 away from the second linear flow channel 112, and the liquid outlet 14 is disposed at an end of the fourth linear flow channel 114 away from the second linear flow channel 112; the liquid inlet 13 is provided with a liquid inlet pipe (not shown) in a penetrating way, and the liquid outlet 14 is provided with a liquid outlet pipe (not shown) in a penetrating way.

Of course, in other embodiments, the liquid inlet 13 and the liquid outlet 14 may be disposed on the cold plate 2, which is not limited herein.

Preferably, the width of the branch channel is larger than the width of the main liquid inlet channel and the main liquid outlet channel. Specifically, the width d1 of the first linear flow channel 111 in the branch channel is greater than the width d2 of the third linear flow channel 113 in the liquid inlet main channel and the width d3 of the fourth linear flow channel 114 in the liquid outlet main channel, so that the flow of fluid flowing into the first linear flow channel 111 is greater, and the concentrated heat exchange can be performed on the region with higher temperature of the cell module 3, thereby realizing uniform heat dissipation of the cell module 3.

Because the middle position of the cell module 3 is the position with the highest heat and the worst heat dissipation capacity, the middle position of the cell module 3 can be better subjected to heat absorption and temperature reduction by increasing the flow of fluid flowing into the branch channel, so that better heat dissipation treatment is obtained.

Therefore, through designing the channels with different widths, the fluid flow in the channels can be adjusted, the channels can be flexibly adjusted according to the temperature distribution of the cell module 3, the heat exchange effect is improved, and uniform heat dissipation is realized.

Example two

Referring to fig. 4, the utility model further provides a battery pack liquid cooling system, which comprises the battery cell module 3 and the liquid cooling plate in the first embodiment, wherein the liquid cooling plate is arranged at one end of the battery cell module 3. Specifically, the cell module 3 includes a plurality of parallel cylindrical cells 31, the lower end surface of the cold plate 2 is attached to the top surfaces of the plurality of cylindrical cells 31 to realize heat conduction, and the heat transfer direction between the cold plate 2 and the plurality of cylindrical cells 31 is performed along the axial direction of the cylindrical cells 31, and the axial heat conductivity coefficient of the cylindrical cells 31 is larger, so that the heat exchange effect is better.

compared with the traditional turbulence protrusions, the liquid cooling plate disclosed by the utility model not only does not occupy the volume of the flow channel 11, but also increases the heat exchange area of the flow channel 11, so that the flow of fluid entering the flow channel 11 is more, and the heat exchange efficiency is further improved; in addition, the plurality of turbulent blind windows can change the fluid flowing state, enhance the disturbance of the fluid when flowing in the runner groove 11, enable the fluid to be fully mixed, and further improve the heat exchange effect. In addition, by adding nano particles with good heat conduction performance into the fluid, the heat conduction coefficient of the fluid is greatly increased, and the heat exchange effect is further improved.

According to the liquid cooling plate disclosed by the utility model, the position distribution of the turbulent blind window can be flexibly adjusted according to the temperature distribution of the electric core module 3, so that the heat exchange effect is improved, the electric core module 3 is prevented from being damaged due to overhigh local temperature, and the temperature consistency of the electric core module 3 is ensured.

And thirdly, the liquid cooling plate can increase disturbance in fluid flow by changing the shape of the nano particles, so that the heat exchange efficiency is improved.

And fourthly, the liquid cooling plate of the utility model designs the runner grooves 11 into parallel grooves, so that fluid can uniformly flow into each groove, the flow uniformity of the fluid is improved, and the cooling effect of the liquid cooling plate is further improved.

And fifthly, the liquid cooling plate can realize the adjustment of the fluid flow in the channels by designing the channels with different widths, so that the channels can be flexibly distributed according to the temperature distribution of the cell module 4, the heat exchange effect is improved, and the uniform heat dissipation is realized.

The battery pack liquid cooling system of the utility model has better cooling effect by adopting the liquid cooling plate, can improve energy density and simplify structure.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should be understood that the terms "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, in the description of the present utility model, the meaning of "a plurality", "a number" is two or more, unless explicitly defined otherwise.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A liquid cooling plate, comprising:

the flow channel plate (1) is internally stamped with a flow channel groove (11), and a plurality of turbulent blind windows are arranged on the flow channel groove (11);

a cold plate (2) having one end surface thereof bonded to the flow path plate (1) and sealing the flow path groove (11) to form a flow path in which a coolant flows; the other end face of the cold plate (2) is used for contacting with the cell module (3) to conduct heat;

2. The liquid cooling plate according to claim 1, wherein the turbulent blind window is a groove (12) formed on a side portion of the flow channel groove (11), and a plurality of the grooves (12) are arranged at intervals along a flow direction of the cooling liquid.

3. The liquid cooling plate according to claim 2, wherein the grooves (12) are rectangular, circular or triangular.

4. The liquid cooling plate according to claim 1, wherein the nanoparticles are rod-like or elongated.

5. The liquid cooling plate according to any one of claims 1-4, wherein the flow channel plate (1) or the cold plate (2) is provided with a liquid inlet (13) and a liquid outlet (14) which are communicated with the flow channel groove (11) and are respectively positioned at two sides, wherein:

the runner groove (11) comprises a liquid inlet main channel communicated with the liquid inlet (13), a liquid outlet main channel which is arranged at intervals with the liquid inlet main channel and communicated with the liquid outlet (14), and a branch channel which is arranged between the liquid inlet main channel and the liquid outlet main channel and communicated with the liquid inlet main channel and the liquid outlet main channel, wherein the liquid inlet main channel, the liquid outlet main channel and the branch channel form a parallel channel.

6. The liquid cooling plate according to claim 5, wherein the branch channels comprise a plurality of first linear channels (111) which are arranged at intervals in parallel and extend in the length direction of the flow channel plate (1), and at least two second linear channels (112) which are arranged at intervals in parallel and extend in the width direction of the flow channel plate (1);

at least two second straight-line flow channels (112) are respectively arranged at two ends of the first straight-line flow channels (111) and are communicated with the first straight-line flow channels to form parallel flow channels.

7. The liquid cooling plate according to claim 6, wherein the liquid inlet main channel is a third linear channel (113) extending along the length direction of the flow channel plate (1) and parallel to the first linear channel (111), and one end of the third linear channel (113) is communicated with one end of at least one second linear channel (112).

8. The liquid cooling plate according to claim 7, wherein the liquid outlet main channel is a fourth linear channel (114) extending along the length direction of the flow channel plate (1) and arranged in parallel with the first linear channel (111), and one end of the fourth linear channel (114) is communicated with one end of at least another second linear channel (112).

9. The liquid cooling plate according to claim 5, wherein the width of the branch channel is larger than the widths of the inlet main channel and the outlet main channel.

10. A battery pack liquid cooling system, characterized by comprising a battery cell module (3) and the liquid cooling plate according to any one of claims 1-9, wherein the liquid cooling plate is arranged at one end of the battery cell module (3).