WO2022062528A1

WO2022062528A1 - Liquid-cooled battery system and liquid-cooled battery system control method

Info

Publication number: WO2022062528A1
Application number: PCT/CN2021/102963
Authority: WO
Inventors: 周琪; 卢军; 李阳; 王明; 乔延涛; 尹芳芳; 于鹏; 王振涛
Original assignee: 中国第一汽车股份有限公司
Priority date: 2020-09-27
Filing date: 2021-06-29
Publication date: 2022-03-31
Also published as: CN112151910B; CN112151910A

Abstract

Provided are a liquid-cooled battery system and a liquid-cooled battery system control method, the liquid-cooled battery system comprising: a battery module (1); a cooling load-bearing component (2), comprising a bottom guard panel (21) and a liquid cooling plate (22) disposed on the upper surface of the bottom guard panel, the battery module being located on the upper surface of the liquid-cooled plate, the liquid cooling plate being internally provided with a plurality of cooling flow channels (221) arranged sequentially in a first direction, each cooling flow channel having a liquid inlet (2211) and a liquid outlet (2212), respectively, the flow rate in each cooling flow channel being the same. The liquid-cooled battery system control method is arranged to control the cooling of the described liquid-cooled battery system.

Description

Liquid-cooled battery system and control method of liquid-cooled battery system

This application claims the priority of the Chinese patent application with an application date of September 27, 2020 and an application number of 202011035109.0, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of on-board batteries, for example, to a liquid-cooled battery system and a control method of the liquid-cooled battery system.

Background technique

With the continuous development of new energy technology, the application of new energy vehicles is becoming more and more extensive.

The on-board battery pack powers the vehicle while driving. During driving, the on-board battery pack will heat up, and when the temperature of the on-board battery pack is too high, certain safety hazards will occur. Therefore, in the related art, a cooling water pipe is generally arranged inside the vehicle-mounted battery pack to cool the vehicle-mounted battery pack.

However, in the related art, the cooling water pipe is arranged inside the vehicle battery pack. Once the cooling water pipe leaks, it will have a very negative impact on the safety of the vehicle battery pack and the safety of the whole vehicle, making the vehicle extremely safe. hidden danger.

SUMMARY OF THE INVENTION

The present application provides a liquid-cooled battery system, which can improve the integration efficiency of the liquid-cooled battery system and improve the safety performance of the liquid-cooled battery system.

An embodiment provides a liquid-cooled battery system, including:

battery module;

The cooling bearing part includes a bottom shield and a liquid cooling plate arranged on the upper surface of the bottom shield. The battery module is located on the upper surface of the liquid cooling plate. The cooling channels are arranged in sequence in one direction, each cooling channel has a liquid inlet and a liquid outlet respectively, and the flow rate in each cooling channel is the same.

Optionally, the inside of the liquid cooling plate is further provided with a total liquid inlet flow channel and a total liquid outlet flow channel, the liquid inlet of each cooling flow channel is respectively connected with the total liquid inlet flow channel, and each The liquid outlets of the cooling flow passages are respectively communicated with the total liquid outlet flow passages.

Optionally, the total liquid inlet flow channel includes a plurality of liquid inlet flow channels connected in sequence, and the plurality of liquid inlet flow channels are arranged in a one-to-one correspondence with the liquid inlets of the plurality of cooling flow channels, along the With regard to the liquid flow direction of the total liquid inlet flow channel, the cross-sectional areas of the plurality of liquid inlet flow channels are sequentially reduced.

Optionally, the total liquid outlet flow channel includes a plurality of liquid outlet flow channels connected in sequence, and the plurality of liquid outlet flow channels are arranged in a one-to-one correspondence with the liquid outlet ports of the plurality of cooling flow channels. With respect to the liquid flow direction of the total outflow channel, the cross-sectional areas of the plurality of outflow channels increase sequentially.

Optionally, the liquid-cooled battery system further includes a box frame assembly, the bottom guard plate and the liquid cooling plate are respectively connected to the box frame assembly, and the battery module is arranged in the box. body frame assembly.

Optionally, the box frame assembly is provided with a thermal insulation grid partition, and the thermal insulation grid partition enables a plurality of battery modules arranged in an array to be installed in the box frame assembly. bit.

Optionally, the liquid-cooled battery system further includes a cooling liquid pipe joint, and the cooling liquid pipe joint communicates with the plurality of cooling flow channels and is located outside the box frame assembly.

Optionally, an installation guide structure is provided on the battery module.

The present application provides a control method for a liquid-cooled battery system, which is configured to control the cooling of the above-mentioned liquid-cooled battery system and improve the cooling effect.

An embodiment provides a control method for a liquid-cooled battery system, which is configured to control the above-mentioned liquid-cooled battery system to cool a battery module, the liquid-cooled battery system further includes a cooling device, and the cooling device is configured to cool the liquid The cooling liquid is transported in the plate, and the battery module includes a plurality of battery cells;

The control method of the liquid-cooled battery system includes:

Step 1. Collect the first current temperature of a plurality of the battery cells;

Step 2. Determine whether the maximum value of the first current temperature of the plurality of battery cells is less than the first set temperature, and in response to the maximum value of the first current temperature of the plurality of battery cells being less than the first set temperature, execute Step 3: In response to the maximum value of the first current temperature of the plurality of battery cells being greater than or equal to the first set temperature, perform Step 4;

Step 3, judging whether the difference between the maximum value and the minimum value of the first current temperature of the plurality of battery cells is less than the first set value, in response to the maximum value and minimum value of the first current temperature of the plurality of battery cells If the difference is less than the first set value, go back to executing step 1; in response to the difference between the maximum value and the minimum value of the first current temperature of the plurality of cells being greater than or equal to the first set value, execute step 4;

Step 4: The cooling device delivers cooling liquid into the liquid cooling plate, and after setting the initial temperature of the cooling liquid, the plurality of cells are cooled, and the cooling duration is the set duration.

Optionally, the control method of the liquid-cooled battery system further includes:

Step 5, collecting the second current temperature of a plurality of the battery cells;

Step 6. Determine whether the maximum value of the second current temperature of the plurality of battery cells is greater than the second set temperature, and in response to the maximum value of the second current temperature of the plurality of battery cells being greater than the second set temperature, return Execute the step 4; in response to the maximum value of the second current temperature of the plurality of cells being less than or equal to the second set temperature, execute the step 7;

Step 7, judging whether the difference between the maximum value and the minimum value of the second current temperature of the plurality of battery cells is greater than the second set value, in response to the maximum value and minimum value of the second current temperature of the plurality of battery cells If the difference is greater than the second set value, go back to executing step 4; in response to the difference between the maximum value and the minimum value of the second current temperature of the plurality of cells being less than or equal to the second set value, execute step 8;

Step 8, the cooling device stops working.

Description of drawings

1 is a schematic diagram of an exploded structure of a liquid-cooled battery system provided in Embodiment 1 of the present application;

2 is a schematic diagram of an exploded structure of a cooling bearing component provided in Embodiment 1 of the present application;

FIG. 3 is a partial structural schematic diagram of the cooling bearing component provided in Embodiment 1 of the present application;

4 is a schematic diagram of an exploded structure of a liquid cooling plate provided in Embodiment 1 of the present application;

5 is a schematic diagram of the installation position of the coolant pipe joint provided in Embodiment 1 of the present application;

6 is a schematic structural diagram of a battery module provided in Embodiment 1 of the present application;

7 is a schematic diagram of the installation of the battery module provided in the first embodiment of the present application in the box frame assembly;

FIG. 8 is a flowchart of a control method of a liquid-cooled battery system provided in Embodiment 2 of the present application.

In the picture:

1. Battery module; 11. Battery cell; 12. End plate; 121. Guiding and avoiding slope; 122. Positioning protrusion; 13. Packing belt;

2. Cooling bearing part; 21. Bottom guard plate; 211. Connector; 22. Liquid cooling plate; 221, Cooling flow channel; 2211, Liquid inlet; , total outlet flow channel; 224, liquid-cooled upper plate; 225, liquid-cooled lower plate;

3. Box frame assembly; 31. Insulation grid separator; 32. Battery module installation position;

4. Coolant pipe joint;

5. Upper cover.

detailed description

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Therein, the terms "first position" and "second position" are two different positions.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

Example 1

Referring to FIGS. 1 to 7 , this embodiment provides a liquid-cooled battery system. The liquid-cooled battery system is applied to an automobile, which can improve the safety of the battery module, thereby improving the safety performance of the entire vehicle.

Referring to FIG. 1 , FIG. 2 and FIG. 4 , in this embodiment, the liquid-cooled battery system includes a battery module 1 and a cooling bearing member 2 .

The cooling bearing member 2 includes a bottom shield 21 and a liquid cooling plate 22 arranged on the upper surface of the bottom shield 21 . The battery module 1 is located on the upper surface of the liquid cooling plate 22 . The cooling channels 221 arranged in sequence, each cooling channel 221 has a liquid inlet 2211 and a liquid outlet 2212, and the flow rate in each cooling channel 221 is the same.

In the liquid-cooled battery system provided in this embodiment, by disposing the liquid-cooling plate 22 under the battery module 1 and disposing the cooling channel 221 in the liquid-cooling plate 22, the cooling pipe is avoided to be disposed in the battery module 1, so that the Avoid potential safety hazards caused by coolant leakage. By arranging a plurality of cooling channels 221 and controlling the flow rate in each cooling channel 221 to be the same, uniform cooling of the battery module 1 is achieved, so that the temperature of the battery module 1 is uniform, and the local cooling of the battery module 1 is avoided. The problem is that the effect is not good and the local temperature is too high. By arranging the bottom guard plate 21, the damage to the liquid-cooling plate 22 caused by the impact of external impurities and the bottom of the vehicle is prevented, and the bearing capacity of the liquid-cooling plate 22 is assisted to improve, thereby ensuring the stability of the liquid-cooled battery system; the bottom guard plate 21 and The liquid cooling plates 22 together form a protective structure at the bottom of the battery module 1 to ensure the safety of the bottom of the battery module 1 and prevent the battery module 1 from being damaged.

In one embodiment, in order to be able to install the battery module 1 reliably, referring to FIG. 1 and FIG. 2 , the liquid-cooled battery system further includes a box frame assembly 3 . 3 connections are made, and the battery module 1 is arranged in the box frame assembly 3 .

In this embodiment, after the liquid cooling plate 22 is connected to the box frame assembly 3 , the bottom shield 21 and the box frame assembly 3 are connected through the connecting member 211 (refer to FIG. 3 ).

Optionally, the thickness of the liquid cooling plate 22 is 6mm-9mm.

Optionally, the thickness of the bottom shield 21 is 1mm-5mm.

Optionally, the material of the bottom shield 21 is a hard non-metallic material or a high-strength metal material, so as to ensure the protective effect of the bottom shield 21 on the liquid cooling plate 22 . In one embodiment, the surface of the bottom shield 21 facing the liquid cooling plate 22 is provided with protective reinforcing ribs, which can improve the mode of the bottom shield 21 and assist in improving the bearing capacity of the liquid cooling plate 22 .

When the liquid-cooled battery system is installed on the vehicle body, the box frame assembly 3 is fixedly connected to the vehicle floor of the vehicle body.

Referring to FIG. 3 , the upper edge surface of the liquid cooling plate 22 and the box frame assembly 3 are bonded by structural adhesive, the edge end face of the liquid cooling plate 22 and the box frame assembly 3 are welded by friction stir welding, and the bottom guard plate 21 and the box frame assembly 3 are welded by friction stir welding. The box frame assembly 3 is connected through the connecting piece 211 . Optionally, the connecting member 211 is a bolt or a screw.

The upper surface of the liquid cooling plate 22 is bonded to the battery module 1 by means of a thermally conductive structural adhesive, and the gap between the battery module 1 and the liquid cooling plate 22 is filled by the thermally conductive structural adhesive. In this way, the liquid cooling plate 22 can not only conduct heat to the battery module 1, but also can carry the battery module 1, and the battery module 1 is bonded to the upper surface of the liquid cooling plate 22 through the thermal conductive structural adhesive, without the need for a box body. The lower bottom plate of the frame assembly 3 and the battery module fixing bracket and other components can realize the lightweight design of the product and save the cost; and reduce the height of the product, improve the integration efficiency of the liquid-cooled battery system, and save the installation space.

In one embodiment, the liquid-cooled battery system includes a plurality of battery modules 1 , the plurality of battery modules 1 constitute a battery pack of the liquid-cooled battery system, and the plurality of battery modules 1 are installed in the box frame assembly 3 .

Referring to FIGS. 1 and 2 , in order to prevent thermal runaway of some battery modules 1 from affecting the overall temperature of the battery pack, optionally, in this embodiment, the box frame assembly 3 is provided with an insulating grid partition 31 , the insulating grid partition 31 forms a plurality of battery module installation positions 32 arranged in an array, and each battery module installation position 32 can be placed in one or more battery modules 1 .

In one embodiment, the battery modules 1 in each battery module installation position 32 are individually sealed.

Optionally, in this embodiment, the battery modules 1 in each battery module installation position 32 are covered by mica or other thermal diffusion protective materials for independent sealing, and mica or other thermal diffusion protective materials can protect each battery module. The battery module 1 in the installation position 32 is physically isolated, which effectively blocks heat radiation and heat diffusion. When the battery module 1 in a battery module installation position 32 is thermally out of control, the mica can effectively slow down the heat diffusion speed, realize thermal isolation of the module area, and improve the safety performance of the liquid-cooled battery system.

Referring to FIG. 4 , in this embodiment, the liquid cooling plate 22 is also provided with a total liquid inlet channel 222 and a total liquid outlet channel 223 , and the liquid inlet 2211 of each cooling channel 221 is connected to the total liquid inlet channel 222 The liquid outlet 2212 of each cooling channel 221 is communicated with the total liquid outlet channel 223 .

In order to make the flow rate in each cooling channel 221 the same, in this embodiment, the total liquid inlet channel 222 includes a plurality of liquid inlet channels connected in sequence, and the plurality of liquid inlet channels and the liquid inlet of the cooling channel 221 The ports 2211 are arranged in a one-to-one correspondence, and along the liquid flow direction of the total liquid inlet channel 222 , the cross-sectional areas of the plurality of liquid inlet channels decrease in turn.

Correspondingly, the total liquid outlet flow channel 223 includes a plurality of liquid outlet flow channels that are connected in sequence, and the plurality of liquid outlet flow channels are arranged in a one-to-one correspondence with the liquid outlet ports 2212 of the cooling flow channel 221 , and the liquid flows along the total liquid outlet flow channel 223 . The cross-sectional areas of the plurality of liquid outlet flow channels increase in turn, so as to ensure that the cooling liquid flowing out from the cooling flow channel 221 can always flow uniformly.

In this embodiment, the liquid cooling plate 22 is provided with three cooling channels 221 , and the total liquid inlet channel 222 includes three liquid inlet channels. The ratio of the cross-sectional area is: 5:2:1; the total outflow channel 223 includes three outflow channels, and along the liquid flow direction of the total outflow channel 223, the ratio of the cross-sectional areas of the three outflow channels is : 1:2:5.

In this embodiment, the liquid cooling plate 22 includes a liquid cooling upper plate 224 and a liquid cooling lower plate 225 . Optionally, the liquid cooling upper plate 224 is a flat metal plate, and the liquid cooling lower plate 225 is provided with a cooling flow channel 221 , a general liquid inlet flow channel 222 and a general liquid outlet flow channel 223 . Exemplarily, the cooling flow channel 221 , the total liquid inlet flow channel 222 and the total liquid outlet flow channel 223 are processed on the liquid cooling lower plate 225 by stamping or machining.

Optionally, in this embodiment, the liquid-cooled upper plate 224 and the liquid-cooled lower plate 225 are both aluminum plates, which have good thermal conductivity.

In one embodiment, the liquid-cooled upper plate 224 and the liquid-cooled lower plate 225 are connected by brazing.

Optionally, in order to improve the cooling effect, in this embodiment, the cooling flow channel 221 is a serpentine flow channel, which prolongs the stroke of the cooling liquid and improves the cooling effect.

In one embodiment, in order to ensure the bearing capacity of the liquid cooling plate 22 for the battery module 1, on the vertical section of the liquid cooling plate 22 along the first direction, the cooling channel 221 of the cavity and the solid bearing structure are separated. The ratio is 1:1.

Referring to FIG. 4 and FIG. 5 , in this embodiment, the liquid-cooled battery system further includes a cooling liquid pipe joint 4 , and the cooling liquid pipe joint 4 communicates with the cooling flow channel 221 and is located outside the box frame assembly 3 . The cooling liquid enters the cooling channel 221 through the cooling liquid pipe joint 4 .

In one embodiment, two cooling liquid pipe joints 4 are provided, which are respectively the liquid outlet pipe joint and the liquid inlet pipe joint. The cooling liquid pipe joint 4 of the liquid pipe joint is communicated with the general liquid outlet flow channel 223 .

In this embodiment, the cooling liquid pipe joint 4 is arranged outside the box frame assembly 3, so that the cooling liquid pipe joint 4 extends out of the box frame assembly 3 alone, and there is no need to use over-board connection, and the cooling liquid pipe joint 4 It will also not interfere with the internal structure of the box frame assembly 3. The welding position of the coolant pipe joint 4 and the liquid cooling plate 22 is located outside the box frame assembly 3, which can effectively prevent the leakage of the coolant caused by the failure of the welding seam. impact and improve system security.

In one embodiment, the liquid cooling plate 22 is partially located outside the box frame assembly 3 , and the cooling liquid pipe joint 4 is connected to the portion of the liquid cooling plate 22 located outside the box frame assembly 3 . The part of the liquid cooling plate 22 located outside the box frame assembly 3 and the box frame assembly 3 adopt a bonding process, which can not only ensure good sealing performance, but also avoid damage to the cooling channel 221 in the liquid cooling plate 22. destroy.

In one embodiment, the portion of the liquid cooling plate 22 located outside the box frame assembly 3 is provided with two connection holes, one of which is communicated with the liquid inlet end of the total liquid inlet channel 222, and the other is connected to the liquid inlet. It communicates with the liquid outlet end of the general liquid outlet channel 223 . The two coolant pipe joints 4 are respectively communicated with the two connection holes.

In one embodiment, the connection holes are provided on the liquid-cooled upper plate 224 , and the cooling liquid pipe joint 4 and the liquid-cooled upper plate 224 are connected by brazing.

In this embodiment, the connection hole connecting the cooling liquid pipe joint 4 and the cooling channel 221 is arranged outside the box frame assembly 3 to avoid the risk of cooling liquid leakage in the space where the battery module 1 is directly contacted, thereby improving the liquid cooling effect. Safety of battery systems.

Referring to FIGS. 6 and 7 , in order to enable the battery module 1 to be smoothly installed into the box frame assembly 3 , an installation guide structure is provided on the battery module 1 .

In this embodiment, the battery module 1 includes a plurality of battery cells 11 , an end plate 12 and a packing tape 13 . The plurality of battery cells 11 are arranged in an array. There is an end plate 12 at each end of the battery module 1 . The end plate 12 is provided with a belt groove. 11 bundled into groups.

In one embodiment, the installation guide structure of the battery module 1 is a guide and avoidance slope 121 disposed on the lower side of the end plate 12 . The installation of the guide and avoidance slope 121 can reduce the assembly difficulty of the battery module 1 .

In one embodiment, the battery module 1 is further provided with a positioning structure.

Exemplarily, the positioning structure is a positioning protrusion 122 provided on the end plate 12 , and an overlapping surface matched with the positioning protrusion 122 is provided on the box frame assembly 3 .

When assembling the battery module 1, the guiding and avoiding slope 121 first enters the box frame assembly 3, so that the lower end of the battery module 1 can smoothly enter the box frame assembly 3; as the battery module 1 continues to be assembled, the positioning The protrusion 122 abuts against the lap surface, and the battery module 1 is assembled at this time.

In an embodiment, as shown in FIG. 1 , the liquid-cooled battery system further includes an upper cover plate 5 , and the upper cover plate 5 is covered at the upper end opening of the box frame assembly 3 .

Embodiment 2

Referring to FIG. 8 , this embodiment provides a method for controlling a liquid-cooled battery system, which is configured to control the liquid-cooled battery system in the first embodiment to cool the battery module 1 .

In one embodiment, the liquid-cooled battery system further includes a cooling device, and the cooling device is configured to deliver cooling liquid into the liquid-cooling plate 22 . The battery module 1 includes a plurality of battery cells 11 .

The control method of the liquid-cooled battery system includes the following steps S1-S8:

S1, collecting the first current temperature of the plurality of cells 11;

In step S1, if the liquid-cooled battery system includes a plurality of battery modules 1, the first current temperature of all the battery cells 11 is collected.

S2, judging whether the maximum value of the first current temperature of the plurality of cells 11 is less than the first set temperature, if so, go to step S3; if not, go to step S4;

S3, judging whether the difference between the maximum value and the minimum value of the first current temperature of the plurality of cells 11 is less than the first set value, if so, return to step S1; if not, execute step S4;

S4, the cooling device transports the cooling liquid into the liquid cooling plate 22, and after setting the initial temperature of the cooling liquid, the plurality of cells 11 are cooled, and the cooling duration is the set duration;

In step S4, by setting the initial temperature of the cooling liquid, when the cooling device cools the battery module 1, the initial temperature of the cooling liquid can be selected to be relatively low according to needs, so as to achieve the effect of rapid cooling; The initial temperature of module 1 coolant is relatively high to avoid wasting energy.

S5, collecting the second current temperature of the plurality of cells 11;

S6, determine whether the maximum value of the second current temperature of the plurality of cells 11 is greater than the second set temperature, if so, go back to step S4; if not, go to step S7;

S7, determine whether the difference between the maximum value and the minimum value of the second current temperature of the plurality of cells 11 is greater than the second set value, if so, return to step S4; if not, execute step S8;

S8, the cooling device stops working.

In the liquid-cooled battery system proposed in the present application, by disposing the liquid-cooling plate 22 under the battery module 1 and opening the cooling channel 221 in the liquid-cooling plate 22, the cooling pipe is avoided to be arranged in the battery module 1, thereby avoiding Safety hazards arising from coolant leakage. By arranging a plurality of cooling channels 221 and controlling the flow rate in each cooling channel 221 to be the same, uniform cooling of the battery module 1 is achieved, so that the temperature of the battery module 1 is uniform, and the local cooling of the battery module 1 is avoided. The problem is that the effect is not good and the local temperature is too high. By arranging the bottom guard plate 21, the bearing capacity of the liquid cooling plate 22 is improved, thereby ensuring the stability of the liquid cooling battery system and preventing the damage of the liquid cooling plate by external impurities; the bottom guard plate 21 and the liquid cooling plate 22 are composed together. The protective structure at the bottom of the battery module 1 ensures the safety of the bottom of the battery module 1 and prevents the battery module 1 from being damaged.

The control method of the liquid-cooled battery system proposed in the present application can precisely control the cooling of the liquid-cooled battery system. Whether the local temperature of the module 1 is too high is used to determine whether to activate the cooling device to avoid the local high temperature of the battery module 1; The setting value can determine whether the temperature difference of the plurality of cells is too large to determine whether to activate the cooling device, so as to avoid the temperature difference between the plurality of cells 11 of the battery module 1 being too large.

Claims

A liquid-cooled battery system includes:

battery module (1);

The cooling bearing component (2) includes a bottom shield (21) and a liquid cooling plate (22) provided on the upper surface of the bottom shield (21), and the battery module (1) is located on the liquid cooling plate (22). 22), the liquid cooling plate (22) is provided with a plurality of cooling channels (221) arranged in sequence along the first direction, and each cooling channel (221) has a liquid inlet (2211) ) and the liquid outlet (2212), the flow rates in each of the cooling channels (221) are the same.
The liquid-cooled battery system according to claim 1, wherein a total liquid inlet flow channel (222) and a total liquid outlet flow channel (223) are further provided inside the liquid cooling plate (22), each cooling flow channel The liquid inlet (2211) of the channel (221) is respectively communicated with the total liquid inlet flow channel (222), and the liquid outlet (2212) of each cooling flow channel (221) is respectively connected with the total liquid outlet flow Road (223) is connected.
The liquid-cooled battery system according to claim 2, wherein the total liquid inlet flow channel (222) comprises a plurality of liquid inlet flow channels communicated in sequence, and the plurality of liquid inlet flow channels are connected with a plurality of the cooling flow channels. The liquid inlets (2211) of the channels (221) are arranged in a one-to-one correspondence, and along the liquid flow direction of the total liquid inlet flow channel (222), the cross-sectional areas of the plurality of the liquid inlet flow channels are sequentially reduced.
The liquid-cooled battery system according to claim 2, wherein the total liquid outlet flow channel (223) comprises a plurality of liquid outlet flow channels communicated in sequence, and the plurality of liquid outlet flow channels are connected with a plurality of the cooling flow channels. The liquid outlets (2212) of the channels (221) are arranged in a one-to-one correspondence, and along the liquid flow direction of the total outflow channel (223), the cross-sectional areas of the plurality of the outflow channels increase in sequence.
The liquid-cooled battery system according to claim 1, further comprising a box frame assembly (3), wherein the bottom guard plate (21) and the liquid cooling plate (22) are respectively connected to the box frame assembly ( 3) Connection, the battery module (1) is arranged in the box frame assembly (3).
The liquid-cooled battery system according to claim 5, wherein the box frame assembly (3) is provided with a thermal insulation grid partition (31), and the thermal insulation grid partition (31) makes the A plurality of battery module installation positions (32) arranged in an array are formed in the box frame assembly (3).
The liquid-cooled battery system according to claim 5, further comprising a cooling liquid pipe joint (4), the cooling liquid pipe joint (4) being communicated with a plurality of the cooling flow passages (221) and located at the box frame Outside of assembly (3).
The liquid-cooled battery system according to claim 5, wherein an installation guide structure (121) is provided on the battery module (1).
A method for controlling a liquid-cooled battery system, which is configured to control the liquid-cooled battery system according to any one of claims 1 to 8 to cool the battery module (1), the liquid-cooled battery system further comprising a cooling device, and the The cooling device is configured to transport cooling liquid into the liquid cooling plate (22), and the battery module (1) includes a plurality of battery cells (11);

The control method of the liquid-cooled battery system includes:

Step 1 (S1), collecting the first current temperatures of a plurality of the battery cells (11);

Step 2 (S2): judging whether the maximum value of the first current temperature of the plurality of battery cells (11) is less than the first set temperature, in response to the maximum value of the first current temperature of the plurality of battery cells (11). If the value is less than the first set temperature, execute step 3 (S3); in response to the maximum value of the first current temperature of the plurality of cells (11) being greater than or equal to the first set temperature, execute step 4 (S4);

Step 3 (S3), judging whether the difference between the maximum value and the minimum value of the first current temperature of the plurality of said cells (11) is less than the first set value, in response to the first temperature of the plurality of said cells (11). The difference between the maximum value and the minimum value of the current temperature is smaller than the first set value, and the step 1 (S1) is returned to execute; in response to the maximum value and the minimum value of the first current temperature of the plurality of cells (11) The difference is greater than or equal to the first set value, execute step 4 (S4);

In step 4 (S4), the cooling device delivers cooling liquid into the liquid cooling plate (22), and after setting the initial temperature of the cooling liquid, the plurality of battery cells (11) are cooled, and the cooling duration is set to be set. long time.
The control method of the liquid-cooled battery system according to claim 9, further comprising:

Step 5 (S5), collecting the second current temperatures of a plurality of the battery cells (11);

Step 6 (S6), judging whether the maximum value of the second current temperature of the plurality of said cells (11) is greater than the second set temperature, in response to the maximum value of the second current temperature of the plurality of said cells (11) If the value is greater than the second set temperature, go back to executing step 4 (S4); in response to the maximum value of the second current temperature of the plurality of cells (11) being less than or equal to the second set temperature, execute step 7 ( S7);

Step 7 (S7), judging whether the difference between the maximum value and the minimum value of the second current temperature of the plurality of said batteries (11) is greater than the second set value, in response to the first temperature of the plurality of said batteries (11) 2. The difference between the maximum value and the minimum value of the current temperature is greater than the second set value, and the step 4 (S4) is returned to be executed; in response to the maximum value and the minimum value of the second current temperature of the plurality of cells (11) The difference is less than or equal to the second set value, and execute step 8 (S8);

Step 8 (S8), the cooling device stops working.