WO2023066260A1

WO2023066260A1 - Battery housing and square-housing battery

Info

Publication number: WO2023066260A1
Application number: PCT/CN2022/125994
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: 2021-10-18
Filing date: 2022-10-18
Publication date: 2023-04-27
Also published as: CN113964422A

Abstract

A square-housing battery, comprising a cell (5), an electrolyte, and a battery housing (10). The battery housing (10) comprises a U-shaped housing (1), a bottom plate (4), a first end plate (2), and a second end plate (3). The U-shaped housing (1) comprises a refrigerant channel (11) and a thermal superconducting pipeline (12). A heat transfer working medium is sealed in the thermal superconducting pipeline (12). The U-shaped housing (1) and the bottom plate (4) are connected to form a hollow square housing having openings at two ends. The first end plate (2) and the second end plate (3) are respectively arranged at two ends of the hollow square housing. The first end plate (2) and the second end plate (3) are sealingly connected to the square housing to form the battery housing (10). The battery housing (10) has few heat conduction paths and strong heat dissipation.

Description

Battery case and prismatic battery

This application claims the priority of the Chinese patent application with application number 202111211466.2 filed on October 18, 2021.

technical field

The application belongs to the field of lithium batteries, in particular to a battery case and a square battery.

Background technique

In my country, the new energy industry has developed rapidly with the encouragement of national policies, and secondary batteries such as lithium-ion batteries have been widely used. Generally, the square battery uses a light and thin aluminum shell as the outer shell, plus the battery cell and electrolyte, and welds the upper cover plate to form a sealed shape. However, this square cell cannot effectively solve the problem of heat generation, which may lead to shortened battery life, or lead to smoke, fire or even explosion of the battery. In addition, the traditional prismatic battery needs to use other auxiliary materials or devices outside the battery to help dissipate heat. The heat dissipation path is long, the heat dissipation efficiency is reduced, and the heat dissipation cost is high.

The application adopts a high-efficiency heat transfer structure to provide a battery case and a square shell battery, which can reduce heat dissipation paths, realize strong heat dissipation at the cell level, and achieve the purpose of heat control at the cell level.

technical problem

In view of the above-mentioned shortcomings of the prior art, the purpose of this application is to provide a battery case and a prismatic battery with fewer heat transfer paths and strong heat dissipation at the cell level, to solve the problem that the heat in the closed battery cannot be exported and the battery cell Performance degradation or even fire and explosion problems, and used to solve the problem of low temperature inside the battery and the battery cannot be charged and discharged. The application of the battery case greatly improves the heat dissipation and heat uniformity of the battery, meets the needs of battery cell level heat control, and solves the problem of too many auxiliary heat dissipation devices and high cost of the battery.

technical solution

In order to achieve the above purpose and other related purposes, the application provides a battery case, the battery case includes a U-shaped shell, a bottom plate and two end plates, the U-shaped shell includes refrigerant channels and thermal superconducting lines, The thermal superconducting pipeline is sealed with a heat transfer medium, the U-shaped shell is connected with the bottom plate to form a hollow square shell with open ends, and two end plates are respectively arranged at both ends of the hollow square shell, and the end plates and The square shells are hermetically connected to form a battery case.

In one embodiment, the pipes of the refrigerant channel and the thermal superconducting pipe are expanded on one side, expanding and protruding toward the outside of the housing.

In one embodiment, a refrigerant channel and a thermal superconducting circuit are distributed on one side of the U-shaped shell.

In one embodiment, refrigerant channels and thermal superconducting lines are distributed on both sides of the U-shaped shell.

In one embodiment, the refrigerant channel on the U-shaped shell surrounds the thermal superconducting circuit in a U-shape.

In one embodiment, the refrigerant channel extends out of the battery case to form a water inlet and a water outlet.

In one embodiment, each of the two end plates has a pole.

The purpose of the present application is to provide a battery casing, which improves the heat uniformity and temperature control capabilities of the battery, satisfies the needs of battery-level heat control, and makes the battery safer.

In order to achieve the above purpose and other related purposes, the present application provides a prismatic battery, including a battery cell, an electrolyte, and the above-mentioned battery case, and two end plates are respectively arranged at the openings at both ends of the battery case , the battery cell is placed in the cavity surrounded by the battery case and the end plate and connected to the pole on the end plate.

In one embodiment, the poles on the two end plates are respectively a first pole and a second pole, the battery core includes a first pole and a second pole, and the first pole and the second pole are connected to each other. The first tab of the cell is connected, and the second pole is connected to the second tab of the cell.

Beneficial effect

The purpose of this application: This application adopts a high-efficiency heat transfer structure to provide a battery case and a square shell battery, which can reduce the heat dissipation path, realize strong heat dissipation at the cell level, achieve the purpose of heat control at the cell level, and greatly improve the safety performance of the battery .

Description of drawings

FIG. 1 is an exploded view of a battery case in an embodiment of the present application.

FIG. 2 is a three-dimensional structure diagram of a battery case in an embodiment of the present application.

FIG. 3 is an exploded diagram of a square case battery in an embodiment of the present application.

In the figure: 10-battery housing, 1-U-shaped shell, 11-refrigerant channel, 12-thermal superconducting line, 13-first water inlet, 14-first water outlet, 15-second water inlet, 16- The second water outlet, 2-first end plate, 21-explosion-proof valve, 22-first pole, 3-second end plate, 31-second pole, 4-bottom plate, 5-cell, 51-the first pole One tab, 52-the second tab.

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.

The technical solution of the present application will be further described below in conjunction with the accompanying drawings and through specific implementation methods. As shown in Figures 1 and 2, a battery case 10 proposed by the present application includes a U-shaped shell 1, a first end plate 2, a second end plate 3, and a bottom plate 4, and the U-shaped shell 1 includes a refrigerant A channel 11 and a thermal superconducting circuit 12, the thermal superconducting circuit 12 is sealed with a heat transfer medium (not shown), the U-shaped shell 1 is connected to the bottom plate 4 to form a square shell with open ends and a hollow, the first end The plate 2 and the second end plate 3 are respectively arranged at two ends of the hollow square shell, and the first end plate 2 and the second end plate 3 are sealed and connected with the square shell to form a battery case 10 .

It should be noted that the refrigerant channels 11 and thermal superconducting lines 12 can be distributed on one large side of the U-shaped shell 1 , or can be distributed on two large sides of the U-shaped shell 1 . The heat transfer medium filled in the thermal superconducting circuit 12 can be gas or liquid or a mixture of gas and liquid, such as water, oil and refrigerant. The U-shaped shell 1 filled with heat transfer working medium has the characteristics of heat absorption, fast heat transfer rate and good heat uniformity. Refrigerant is introduced into the refrigerant channel 11 on the U-shaped shell 1, and the heat spread on the U-shaped shell 1 can be continuously taken away, so as to achieve the purpose of cooling; or hot water is introduced into the refrigerant channel 11, U The shell 1 absorbs the heat in the hot water, and transfers the heat to the U-shaped shell 1, so as to achieve the purpose of heating; the refrigerant passed through the refrigerant channel 11 can be gas or liquid or a mixture of gas and liquid. The refrigerant channel 11 surrounds the thermal superconducting circuit 12 in a U shape, and extends outward from the U-shaped shell 1 to form a first water inlet 13 and a first water outlet 14. When the refrigerant channel 11 and the thermal superconducting circuit 12 are distributed in the U When the two large sides of the mold shell are formed, the second water inlet 15 and the second water outlet 16 will also be formed. A pole is respectively provided on the first end plate 2 and the second end plate 3 , and the first end plate 2 and the second end plate 3 are located on opposite sides of the battery case.

The present application also provides a prismatic shell battery, as shown in FIG. The two end plates 3 are respectively provided at the openings at both ends of the battery case 10 , and the battery cells 5 are placed in the battery case 10 and connected to the poles on the end plates.

It should be noted that the first end plate 2 is provided with a first pole 22 and an explosion-proof valve 21, the second end plate 3 is provided with a second pole 31, and the battery core 5 includes a first The tab 51 and the second tab 52 , the first tab 51 of the electric core 5 is connected to the first pole 22 , and the second tab 52 of the electric core 5 is connected to the second pole 31 .

In summary, the present application provides a battery case and a prismatic battery. The battery case includes a U-shaped case, a bottom plate and two end plates. The U-shaped case includes refrigerant channels and thermal superconducting lines. The thermal superconducting pipeline is sealed with a heat transfer medium, the U-shaped shell is connected with the bottom plate to form a hollow square shell with open ends, and two end plates are respectively arranged at both ends of the hollow square shell, and the end plates and The square shells are hermetically connected to form a battery case. The battery casing has the characteristics of fast heat conduction rate, good temperature uniformity and rapid heat exchange. The prismatic shell battery includes the electrolyte, the battery cell and the battery casing. Because the heat wave is integrated on the battery casing to the pipeline and the refrigerant channel, the heat transfer path is reduced, and the temperature control of the prismatic shell battery is It is more accurate and achieves the purpose of cell-level heat control.

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 casing, wherein, the battery casing includes a U-shaped casing, a bottom plate and two end plates, the U-shaped casing includes a refrigerant channel and a thermal superconducting line, and the thermal superconducting line is sealed with a transmission line. Thermal working medium, the U-shaped shell is connected with the bottom plate to form a hollow square shell with open ends, and two end plates are respectively arranged at both ends of the hollow square shell, and the end plates are sealed and connected with the square shell to form a battery case .
The battery casing according to claim 1 , wherein the pipelines of the refrigerant channel and the thermal superconducting pipeline expand on one side and expand and protrude toward the outside of the casing.
The battery case according to claim 1, wherein a refrigerant channel and a thermal superconducting circuit are distributed on one large side of the U-shaped case.
The battery case according to claim 1, wherein refrigerant passages and thermal superconducting lines are distributed on both large sides of the U-shaped case.
The battery casing according to claim 3 or 4, wherein, the refrigerant channel on the U-shaped casing surrounds the thermal superconducting circuit in a U-shape.
The battery case according to claim 5, wherein the refrigerant channel extends outside the battery case to form a water inlet and a water outlet.
The battery case according to claim 6, wherein there is a pole on each of the two end plates.
A prismatic battery, comprising a battery cell, an electrolyte, and a battery case as claimed in any one of claims 1 to 7, two end plates are respectively arranged at the openings at both ends of the battery case, and the The electric core is placed in the cavity surrounded by the battery case and the end plate and connected to the pole on the end plate.
The square shell battery according to claim 8, wherein the poles on the two end plates are respectively a first pole and a second pole, and the battery core includes a first tab and a second tab, The first pole is connected to the first tab, and the second pole is connected to the second tab.