CN-121983703-A - Immersion type cooling method and system for new energy lithium battery system

CN121983703ACN 121983703 ACN121983703 ACN 121983703ACN-121983703-A

Abstract

The application provides a new energy lithium battery system immersion cooling method and a system, which relate to the technical field of energy storage batteries and aim to realize more efficient and uniform heat dissipation in an immersion cooling system and reduce the energy consumption and the structural load of the system at the same time; the spraying device is controlled to act on the upper surface of the battery cell array in a spraying mode, so that the cooling liquid flows from top to bottom along the surface of the battery cell array under the action of gravity to form a liquid film covering the surface of the battery cell and perform heat exchange, the cooling liquid after the heat exchange is collected, and the cooling liquid after the heat exchange is discharged out of the battery box through an outflow channel arranged at the bottom of the battery box.

Inventors

YANG CHAORAN
CHEN XIANSHENG
LIU ZHIXIONG
XU XIANJUN
LEI HAODONG
CHENG QIAN
BAI PANXING
Duan Zhaorong
LIU WEI
WANG NING
SONG JISHUO
CHEN YIZHAO
YAN YUNLING
Xiong Chuanliang
Peng Bailian
WEN CHENGJUN
LIU MINGYI
CAO XI
CAO CHUANZHAO
FU SHIBIN

Assignees

华能海南发电股份有限公司南山电厂
中国华能集团清洁能源技术研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. A method for submerged cooling of a new energy lithium battery system, the method comprising: acquiring heat generated by a lithium battery system in a working state and initial state parameters of a cooling liquid; A spraying device for guiding the cooling liquid to the interior of the battery box body, wherein the spraying device is positioned above the battery cell array accommodated in the interior of the battery box body; Controlling the spraying device to act the cooling liquid on the upper surface of the battery cell array in a spraying mode, so that the cooling liquid flows along the surface of the battery cell array from top to bottom under the action of gravity to form a liquid film covering the surface of the battery cell and perform heat exchange; And collecting the cooling liquid after heat exchange, and discharging the cooling liquid after heat exchange out of the battery box body through an outflow channel arranged at the bottom of the battery box body.
2. The method according to claim 1, wherein the battery box body is of a closed cavity structure, the interior of the battery box body is divided into a battery compartment for accommodating the battery cell array and an electrical compartment for accommodating the electrical element through physical partition, and a first bracket for fixing the spraying device and a second bracket for fixing the filtering device are arranged on the inner wall of the battery box body.
3. The method of claim 1, wherein the spraying device comprises a thin plate-shaped structure body with a closed inner cavity, a liquid inlet port for connecting an external cooling liquid supply pipeline is arranged on the thin plate-shaped structure body, a plurality of spraying holes penetrating through the thickness of the thin plate-shaped structure body are uniformly distributed on one side surface of the thin plate-shaped structure body, and the distribution range of the spraying holes is matched with the projection area of the battery cell array in the battery box body.
4. A method according to claim 3, wherein controlling the spraying device to apply a cooling liquid to the upper surface of the battery cell array in a spray manner comprises: And driving cooling liquid to enter the closed inner cavity of the spraying device through the liquid inlet port by utilizing the pressure provided by the external circulating pump body, so that the cooling liquid is sprayed out from each spraying hole to form a cooling liquid spraying curtain uniformly covering the top of the battery cell array.
5. The method of claim 1, wherein a filter device is arranged at the bottom of the battery box body and positioned between the battery cell array and the outflow channel, the filter device is of a plate-shaped structure, a plurality of filter holes which allow cooling liquid to pass through but can block solid impurities are formed in the filter device, and the cooling liquid is enabled to pass through the filter device after flowing to the bottom along the surface of the battery cells.
6. The method of claim 5, wherein the plate-like structure of the filter device is disposed horizontally or obliquely at the bottom of the battery case, and the surface area of the filter device is greater than or equal to the projected area of the battery cell array at the bottom of the battery case.
7. The method of claim 1, wherein the cooling fluid is a liquid medium having insulating properties and predetermined heat exchange properties, and wherein the initial state parameters of the cooling fluid include at least a temperature and a flow rate prior to entering the spraying device.
8. The method of claim 1, further comprising controlling a total amount of coolant spray applied to the battery cell array per unit time by adjusting power of an external circulation pump body or a valve opening on a coolant supply line.
9. The method according to any one of claims 1 to 8, wherein the battery cell array is assembled from a plurality of lithium ion cells in a predetermined arrangement, and the spray holes are in the shape of one of a circle, an ellipse, or a slit.
10. The utility model provides a new forms of energy lithium cell immersion cooling system which characterized in that includes: The acquisition unit is used for acquiring heat generated by the lithium battery system in a working state and initial state parameters of the cooling liquid; A guiding unit for guiding the cooling liquid to a spraying device in the battery box, wherein the spraying device is positioned above the battery cell array accommodated in the battery box; The control unit is used for controlling the spraying device to act the cooling liquid on the upper surface of the battery cell array in a spraying mode, so that the cooling liquid flows along the surface of the battery cell array from top to bottom under the action of gravity, and a liquid film covering the surface of the battery cell is formed and heat exchange is carried out; And the collecting unit is used for collecting the cooling liquid after heat exchange and discharging the cooling liquid after heat exchange out of the battery box body through an outflow channel arranged at the bottom of the battery box body.

Description

Immersion type cooling method and system for new energy lithium battery system Technical Field The application relates to the technical field of energy storage batteries, in particular to a new energy lithium battery system immersion type cooling method and system. Background In new energy applications such as electric automobiles and energy storage systems, a large amount of heat can be generated in the working process of the lithium ion battery, and if the heat cannot be timely and uniformly dissipated, the battery performance, the service life and even the safety are affected, so that the efficient battery thermal management system is very important. The existing immersed cooling scheme generally adopts a mode of combining integral immersion with internal circulation or an external liquid cooling plate to dissipate heat of the battery, and the methods can realize a certain cooling effect, but still face the common problems that the heat management efficiency is limited, and the system energy consumption and the temperature control uniformity are difficult to be compatible in practical application. Therefore, how to further improve the comprehensive thermal management efficiency of the submerged cooling system is a technical problem to be solved in the art. Disclosure of Invention Based on the technical problems, the application provides a new energy lithium battery system immersion cooling method and system, which aim to realize more efficient and uniform heat dissipation in an immersion cooling system and reduce system energy consumption and structural load. According to the method, heat generated by a lithium battery system in a working state and initial state parameters of cooling liquid are acquired, the cooling liquid is guided to a spraying device in a battery box body, the spraying device is located above a battery cell array contained in the battery box body, the cooling liquid is controlled to act on the upper surface of the battery cell array in a spraying mode, the cooling liquid flows along the surface of the battery cell array from top to bottom under the action of gravity to form a liquid film covering the surface of the battery cell and conduct heat exchange, and the cooling liquid after the heat exchange is collected and discharged out of the battery box body through an outflow channel arranged at the bottom of the battery box body. In a possible implementation mode, the battery box body is of a closed cavity structure, the inside of the battery box body is divided into a battery bin for accommodating the battery cell array and an electric bin for accommodating the electric element through physical partition, and a first bracket for fixing the spraying device and a second bracket for fixing the filtering device are arranged on the inner wall of the battery box body. In one possible implementation mode, the spraying device comprises a thin plate-shaped structure body with a closed inner cavity, wherein a liquid inlet port for connecting an external cooling liquid supply pipeline is arranged on the thin plate-shaped structure body, a plurality of spraying holes penetrating through the thickness of the thin plate-shaped structure body are uniformly distributed on one side surface of the thin plate-shaped structure body, facing the battery cell array, and the distribution range of the spraying holes is matched with a projection area of the battery cell array in the battery box body. In one possible implementation, the control spraying device applies the cooling liquid to the upper surface of the battery cell array in a spraying mode, and the control spraying device comprises driving the cooling liquid to enter a closed inner cavity of the spraying device through a liquid inlet port by utilizing the pressure provided by an external circulating pump body, so that the cooling liquid is sprayed out of each spraying hole to form a cooling liquid spraying curtain uniformly covering the top of the battery cell array. In one possible implementation manner, a filtering device is arranged at the bottom of the battery box body and positioned between the battery cell array and the outflow channel, the filtering device is of a plate-shaped structure, a plurality of filtering holes which allow the cooling liquid to pass through but can block solid impurities are formed in the filtering device, and after the cooling liquid flows to the bottom along the surface of the battery cell, the cooling liquid passes through the filtering device. In one possible implementation manner, the plate-shaped structure of the filtering device is horizontally or obliquely arranged at the bottom of the battery box, and the surface area of the filtering device is larger than or equal to the projection area of the battery cell array at the bottom of the battery box. In a possible implementation, the cooling liquid is a liquid medium with insulating properties and predetermined heat exchange properties, and the initial state param