WO2023066259A1

WO2023066259A1 - Battery pack and energy storage system

Info

Publication number: WO2023066259A1
Application number: PCT/CN2022/125993
Authority: WO
Inventors: 张毅鸿; 周颖; 何秋亮; 赵吉勇; 龚青龙
Original assignee: 重庆三峡时代能源科技有限公司
Priority date: 2021-10-19
Filing date: 2022-10-18
Publication date: 2023-04-27
Also published as: CN114069093A; CN115377547A

Abstract

The technical solutions of the present application provide a battery pack comprising a U-shaped uniform heat radiator, the U-shaped uniform heat radiator comprising a first side surface, a second side surface and a bottom surface, the first side surface and the second side surface each comprising a thermal superconducting pipe and a refrigerant channel, a heat transfer working medium being sealed in the thermal superconducting pipe, and multiple battery cells being arranged in one or more columns in a U-shaped channel of the U-shaped uniform heat radiator. The U-shaped uniform heat radiator can rapidly absorb heat generated in a charging and discharging process of the battery cell, and heat can be conducted out by means of movement of refrigerant in the refrigerant channel, or the refrigerant carrying heat transfers heat to the U-shaped uniform heat radiator, and then heats the battery cell, thereby achieving rapid heat dissipation and heating of the battery pack. The present application also provides an energy storage system having said battery pack.

Description

Battery Pack and Energy Storage System

This application claims the priority of the Chinese patent application with the application number 202210996005.9 filed on August 19, 2022 and the Chinese patent application with the application number 202111216760.2 filed on October 18, 2021.

technical field

The present application relates to the field of battery technology, in particular to a battery pack and an energy storage system.

Background technique

With the extensive application of batteries in production and life, battery safety has become a topic of concern. Failure to dissipate heat in a timely manner during battery charging and discharging will lead to reduced battery performance and life attenuation, and severe problems will lead to breaking, smoking and explosion. At present, the thermal management of batteries mainly adopts air cooling, which has low efficiency; or adopts coil cooling at the bottom of the battery pack for liquid cooling, and the heat dissipation path is long, resulting in low heat dissipation efficiency.

technical problem

The main purpose of this application is to propose a battery pack and an energy storage system, aiming to solve at least one of the above technical problems.

technical solution

In order to achieve the above purpose, a battery pack proposed by the present application includes:

The U-shaped heat soaking radiator includes a first side, a second side and a bottom surface, the first side includes a first thermal superconducting circuit and a first refrigerant channel, and the second side includes a second thermal superconducting circuit and a second channel Two refrigerant channels, the first thermal superconducting circuit and the second thermal superconducting circuit are sealed with heat transfer working medium;

A plurality of batteries installed in the U-shaped channel of the U-shaped soaking radiator;

The shell includes a cover plate and an end plate, the cover plate is arranged on the top of the U-shaped heat soaking radiator, and the end plates are arranged at both ends of the U-shaped heat soaking radiator.

In one embodiment, the first refrigerant channel surrounds the first thermal superconducting circuit in a zigzag shape, and the refrigerant channel surrounds the second thermal superconducting circuit in a zigzag shape; the first refrigerant channel, the second thermal superconducting circuit Both ends of the secondary refrigerant channel are provided with a water inlet and a water outlet, and are connected with an external cooling system.

In one embodiment, the battery cells are arranged in a row in the U-shaped heat soaking radiator.

In one embodiment, the battery cells are arranged in multiple rows in the U-shaped soaking heat sink, and a plate-shaped soaking heat sink is interposed between the rows of cells, and the plate-shaped heat soaking radiator is interposed between the rows. The heat radiator has the same structure as the first side.

In one embodiment, the first thermal superconducting circuit is protruded on the surface of the first side, the second thermal superconducting circuit is protruded on the surface of the second side, and the first refrigerant channel The pipeline is protruded on the surface of the first side, and the second refrigerant channel is protruded on the surface of the second side, and the protruding directions are all facing the outside of the cavity of the U-shaped soaking radiator.

In one embodiment, a flexible insulating and heat-conducting layer is interposed between the battery cores.

In one embodiment, an insulating layer is provided between the surface of the inner cavity of the U-shaped thermal soaking radiator and the electric core.

In one embodiment, the cell is a square cell.

The present application also proposes an energy storage system, including the above-mentioned battery pack, and the energy storage system is a wind power energy storage system, a solar energy storage system or a grid energy storage system.

Beneficial effect

The technical solution of the present application provides a battery pack, including a U-shaped soaking radiator, the U-shaped soaking radiator includes a first side, a second side and a bottom surface, and the first side includes a thermal superconducting line and a refrigerant channel , the thermal superconducting circuit is sealed with a heat transfer medium, and a plurality of battery cells are installed in one or more rows in the U-shaped channel of the U-shaped soaking heat sink. The U-shaped soaking radiator can quickly absorb the heat generated by the battery during charging and discharging, and the heat can be conducted out through the movement of the refrigerant in the refrigerant channel, or the refrigerant carrying heat can transfer the heat to the U-shaped soaking radiator , and then heat the battery cells, so as to realize the rapid heat dissipation and temperature rise of the battery pack. The present application also provides an energy storage system with the battery pack. Since the battery pack can quickly dissipate heat or heat up, it can prevent the normal use of the energy storage system from being affected by insufficient heat dissipation or low temperature.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of a battery pack of the present application.

FIG. 2 is a structural schematic view of another angle of the battery pack embodiment of the present application.

FIG. 3 is a schematic structural diagram of Embodiment 2 of the battery pack of the present application.

in:

1-U-shaped soaking radiator, 10-first side, 11-second side, 12-bottom, 131-first water inlet, 132-first water outlet, 141-second water inlet, 142-second Water outlet, 161-first thermal superconducting circuit, 162-second thermal superconducting circuit, 171-first refrigerant channel, 172-second refrigerant channel, 2-housing, 20-cover plate, 21-first end plate , 22-second end plate, 3-cell, 31-first pole, 32-second pole, 33-explosion-proof valve, 4-flexible insulation and heat conduction layer, 51-first insulation layer, 52-second Insulation layer, 53-the third insulation layer, 6-plate type soaking radiator, 61-the third water inlet, 7-insulation card slot.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Embodiments of the present invention

In order to make the technical problems solved by the application, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the application. Some, but not all, embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

It should be noted that when a component is said to be “fixed” to another component, it may be directly on the other component or there may be an intermediate component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

It should also be noted that if the descriptions of "first", "second", etc. are involved in the embodiment of the present application, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present application.

Example 1:

This application proposes a battery pack, as shown in FIG. 1 , which includes a U-shaped soaking radiator 1, a plurality of batteries 3 and a casing 2; a plurality of batteries 3 are installed in the U-shaped soaking radiator 1 In the cavity, the casing 2 and the U-shaped soaking radiator 1 jointly protect the battery cell 3 and prevent the battery cell 3 from being impacted and disturbed by the external environment.

U-shaped soaking radiator 1, including a first side 10, a second side 11 and a bottom 12, the first side 10 and the second side 11 are perpendicular to the bottom 12, and the first side 10 and the second side 11 are parallel , the first side 10 , the second side 11 and the bottom 12 are tightly connected.

The first side 10 includes a first thermal superconducting circuit 161 and a first refrigerant channel 171, the second side 11 includes a second thermal superconducting circuit 162 and a second refrigerant channel 172, and the first thermal superconducting circuit 161 . A heat transfer medium (not shown) is sealed in the second thermal superconducting pipeline 162 ; a first water inlet 131 and a first water outlet 132 are provided at both ends of the first refrigerant channel 171 . Two ends of the second refrigerant channel 172 are provided with a second water inlet 141 and a second water outlet 142 .

The temperature of the refrigerant passing through the refrigerant channel depends on the temperature of the battery cell 3 . It can be understood that the suitable working temperature of the battery cell 3 is between 20-45°C. When the temperature of the battery cell is higher than 45°C, the battery cell 3 needs to be cooled. Therefore, the first refrigerant channel 171 and the second refrigerant channel Cold water is passed into 172; when the temperature of the cell 3 is lower than 20°C, the cell needs to be heated, so hot water is passed into the first refrigerant channel 171 and the second refrigerant channel 172.

It should be noted that the heat transfer medium filled in the U-shaped soaking radiator 1 can be gas or liquid or a mixture of gas and liquid, such as water, oil, alcohol and the like. The U-shaped soaking heat radiator 1 filled with heat transfer working fluid has the characteristics of heat absorption, fast heat transfer rate and good temperature uniformity. The U-shaped heat soaking radiator 1 can quickly absorb the heat generated during the charging and discharging process of the battery cell 3, and spread the heat evenly. Cooling water can be passed into the first refrigerant channel 171 and the second refrigerant channel 172 to absorb the heat, thereby The heat generated by the battery cell 3 will be taken away; or the first refrigerant channel 171 and the second refrigerant channel 172 are filled with hot water to transfer heat to the battery cell 3 to heat the battery cell 3 below the proper working temperature.

On the U-shaped heat soaking radiator 1, the first refrigerant channel 171 surrounds the first thermal superconducting circuit 161 in a zigzag shape, and the second refrigerant channel 172 surrounds the second thermal superconducting circuit 162 in a zigzag shape. The first refrigerant channel 171, the first The thermal superconducting circuit 161 , the second refrigerant channel 17 and the second thermal superconducting circuit 162 have a single-sided expansion, double-sided expansion or double-sided flat structure on the U-shaped soaking heat sink 1 . The first thermal superconducting pipeline 161 and the second thermal superconducting pipeline 162 are closed pipelines, and the shape of the closed thermal superconducting pipelines can be a hexagonal honeycomb that communicates with each other, or a quadrangle that communicates with each other. In this embodiment, as shown in FIG. 1 , the refrigerant channel 17 and the thermal superconducting circuit 16 protrude from the surface of the U-shaped heat soak radiator 1 and protrude toward the outside of the chamber of the heat soak radiator 1 .

The cell 3 shown in FIG. 1 is a square cell. Of course, in other embodiments, the battery cell 3 may also be a cylindrical battery cell, a soft-pack battery cell, etc., and the present application is not limited thereto.

The casing 2 includes a cover plate 20, a first end plate 21 and a second end plate 22. The cover plate 20 is arranged on the top of the U-shaped heat soaking radiator 1, and the first end plate 21 and the second end plate 22 are respectively arranged on the heat soaking radiator 1. The two ends of the radiator 1. It can be understood that, after a plurality of battery cells 3 are placed in the U-shaped soaking heat sink 1 and then added to the casing 2, the battery cells 3 can be prevented from being impacted and disturbed by the external environment. It should be noted that the battery cells 3 are arranged in a row in the U-shaped soaking radiator 1, the top of the battery cells 3 is provided with an insulating card slot 7, and the battery cells 3 have a first pole 31, a second pole 32 and Explosion-proof valve 33, the draw-in groove on the described insulating draw-in groove 7 corresponds to the position of the battery cell 3 poles one by one, fixes the position of each battery cell, further tightens the internal battery cell, and avoids the shock and loosening of the battery cell. The insulating card slot 7 is provided between the cover plate 20 and the battery core 3 .

Please refer to Fig. 2, Fig. 2 is a schematic diagram of another angle structure of Embodiment 1, that is, turning Fig. 1 by 180° in the vertical direction, wherein, the second side 11 shown in the front of the figure is the U-shaped soaking radiator 1 The second side 11 of the second refrigerant channel 172 and the second thermal superconducting circuit 162 are also included. The second refrigerant channel 172 surrounds the second thermal superconducting circuit 162 in a zigzag shape. The two ends of the second refrigerant channel 172 are respectively provided with a Two water inlets 141 and a second water outlet 142 . It can be understood that, in this embodiment, both the first side 10 and the second side 11 of the U-shaped soaking radiator 1 have thermal superconducting lines and refrigerant channels, which can increase the heat dissipation of the U-shaped soaking radiator 1 efficiency, thereby accelerating the heat dissipation of the battery cell 3 .

In one embodiment, the battery pack further includes a plurality of flexible insulating and heat-conducting layers 4 , and the flexible insulating and heat-conducting layers 4 are sandwiched between adjacent battery cells 3 . The thermal conductivity of the flexible insulating and heat-conducting layer 4 is conducive to heat transfer between the cells 3, and the heat is distributed. At the same time, the flexibility and insulation of the flexible insulating and heat-conducting layer 4 can protect the cells 3 from collisions and conductive interference. Since thermally conductive silica gel has good electrical conductivity and insulating properties, thermally conductive silica gel is usually used as the main material of the flexible insulating heat conducting layer. Of course, the flexible insulating and heat-conducting layer 4 may also use other flexible insulating and heat-conducting materials or insulating flexible phase-change materials.

Please continue to refer to Figure 1, an insulating layer is provided between the surface of the inner cavity of the U-shaped heat soaking radiator 1 and the battery 3, and the first insulating layer 51, the second insulating layer 52 and the third insulating layer 53 are arranged on the U-shaped heat soaking heat dissipation The surface of the inner cavity of the device 1 wraps multiple battery cells 3 in multiple directions, further protecting the battery cells 3 from collisions and conductive interference. Of course, in other embodiments, the insulating layer may be applied insulating coating, paint, interposed insulating sheet, pasted insulating film, etc., and the present application is not limited thereto.

Please refer to Fig. 3, the cells 3 are arranged in two rows in the U-shaped channel of the U-shaped soaking radiator 1, and a plate-type soaking radiator is interposed between the rows of the cells 3 6. The plate-type soaking radiator 6 is the same as the first side structure 10, and the plate-type soaking radiator 6 is provided with a third refrigerant channel (not shown) and a third thermal superconducting line (not shown) , the third refrigerant channel surrounds the third thermal superconducting circuit in a zigzag shape, and a third water inlet 61 and a third water outlet (not shown) are respectively provided at both ends of the third refrigerant channel. Of course, in other embodiments, the cells can be arranged in n columns in the U-shaped soaking radiator 1, where n≥3, and a plate-type soaking radiator 6 is sandwiched between the rows of cells. The water inlets of all radiators 6 are connected to the external cooling system, and the water outlets of all radiators are connected to the external cooling system to dissipate heat or heat the entire battery pack.

The present application also proposes an energy storage system. The energy storage system includes the above-mentioned battery pack. For the specific structure of the battery pack, please refer to the above-mentioned embodiments. Since the energy storage system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the functions brought by the technical solutions of the above-mentioned embodiments, and will not repeat them here. It can be understood that the energy storage system may be a wind power energy storage system, a solar energy storage system, or a grid energy storage system.

The above-mentioned embodiments are only illustrative to illustrate the principles and effects of the present application, but are not intended to limit the present application. Any person familiar with the technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by persons with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this application should still be covered by the claims of this application.

Claims

A battery pack comprising:

The U-shaped heat soaking radiator includes a first side, a second side and a bottom surface, the first side includes a first thermal superconducting circuit and a first refrigerant channel, and the second side includes a second thermal superconducting circuit and a second channel Two refrigerant channels, the first thermal superconducting circuit and the second thermal superconducting circuit are sealed with heat transfer working medium;

A plurality of batteries installed in the U-shaped channel of the U-shaped soaking radiator;

The shell includes a cover plate and an end plate, the cover plate is arranged on the top of the U-shaped heat soaking radiator, and the end plates are arranged at both ends of the U-shaped heat soaking radiator.
The battery pack according to claim 1, wherein the first refrigerant channel surrounds the first thermal superconducting circuit in a zigzag shape, and the refrigerant channel surrounds the second thermal superconducting circuit in a zigzag shape; Both ends of the first refrigerant channel and the second refrigerant channel are provided with water inlets and water outlets, and are connected with an external cooling system.
The battery pack according to claim 2, wherein the battery cells are arranged in a row in the U-shaped soaking heat sink.
The battery pack according to claim 2, wherein the battery cells are arranged in multiple rows in the U-shaped soaking heat sink, and a plate-shaped soaking heat sink is interposed between the rows of cells , the structure of the plate-type soaking radiator is the same as that of the first side.
The battery pack according to claim 1, wherein the first thermal superconducting circuit is protruded on the surface of the first side, and the second thermal superconducting circuit is protruded on the surface of the second side, The pipeline of the first refrigerant channel is protruded on the surface of the first side, and the second refrigerant channel is protruded on the surface of the second side, and the protruding direction is all toward the U-shaped heat dissipation outside of the cavity.
The battery pack according to claim 3 or 4, wherein a flexible insulating and heat-conducting layer is interposed between the battery cells.
The battery pack according to claim 1, wherein an insulating layer is provided between the surface of the inner cavity of the U-shaped thermal soaking radiator and the battery cells.
The battery pack according to claim 7, wherein the cells are square cells.
An energy storage system, comprising the battery pack according to claims 1-8, wherein the energy storage system is a wind power energy storage system, a solar energy storage system or a grid energy storage system.