CN-121721508-B - Method and device for thermally testing heat insulation capacity of solid-state battery under pressurized state

CN121721508BCN 121721508 BCN121721508 BCN 121721508BCN-121721508-B

Abstract

The application relates to the technical field of solid-state battery thermal test, in particular to a method and a device for thermally insulating thermal test under a pressurized state of a solid-state battery. The device comprises upper heat insulation cotton, lower heat insulation cotton, a heating bottom plate, a heating pressing plate, a pressing device, charging and discharging equipment, a thermocouple and a heat insulation simulation device, wherein a measured solid-state battery is positioned between the upper heat insulation cotton and the lower heat insulation cotton, the pressing device is used for fastening the heating pressing plate and the heating bottom plate and adjusting the pressure between the heating pressing plate and the heating bottom plate, heating elements are arranged in the heating bottom plate, the heating pressing plate and the pressing device, the temperature of the surface of the measured solid-state battery is tracked under the control of the control system, and the control system is used for controlling the temperature of an inner cavity of the heat insulation simulation device so as to track the temperature of the surface of the measured solid-state battery. The application improves the accuracy of the adiabatic calorimetric test under the pressurized state of the solid-state battery.

Inventors

MA XIAOLE
LIU SHIQIANG
WANG FANG
ZHANG YUXUAN

Assignees

中汽研新能源汽车检验中心(天津)有限公司

Dates

Publication Date: 20260508
Application Date: 20260226

Claims (7)

1. The heat insulation calorimetric test device under the pressurizing state of the solid-state battery is characterized by comprising an upper heat insulation cotton, a lower heat insulation cotton, a heating bottom plate, a heating pressing plate, a pressing device, charge and discharge equipment, a thermocouple and a heat insulation simulation device; The tested solid-state battery is positioned between the upper heat insulation cotton and the lower heat insulation cotton; The heating bottom plate is arranged below the lower heat insulation cotton, and the heating pressing plate is arranged above the upper heat insulation cotton; The pressing device is used for fastening the heating pressing plate and the heating bottom plate and adjusting the pressure between the heating pressing plate and the heating bottom plate; The thermocouple is attached to the surface of the solid-state battery to be tested, and the temperature of the solid-state battery to be tested is transmitted to a control system of the heat insulation simulation device; the charge and discharge equipment is positioned outside the heat insulation simulation device, connected with the tested solid-state battery, and used for charging and discharging the tested solid-state battery and recording test data; Heating elements are arranged in the heating bottom plate, the heating pressing plate and the pressing device, and the heating bottom plate, the heating pressing plate and the pressing device are controlled by the control system to follow the surface temperature of the solid-state battery to be tested; The control system is used for controlling the temperature of the inner cavity of the heat insulation simulation device so as to realize the following of the surface temperature of the solid-state battery to be tested.
2. The heat insulating calorimetric test apparatus in a pressurized state of a solid-state battery according to claim 1, wherein the pressing means is a fastener; The control system is used for controlling the fastening degree of the fastening piece so as to apply required pressure to the tested solid-state battery.
3. The heat insulating calorimetric test apparatus under pressure of solid-state battery according to claim 2, wherein, The interior of the fastener is a hollow area filled with a heating element.
4. The heat insulating calorimetric test apparatus under pressure of solid-state battery according to claim 3, wherein, The heating bottom plate and the heating pressing plate are reserved with through holes for penetrating through the fasteners; And the heating bottom plate and the heating pressing plate are filled with heating elements in areas except the through holes.
5. The heat insulating calorimetric test apparatus under pressure of solid-state battery according to claim 4, wherein, The heating element is a heating wire, a heating sheet or a heating rod, and the metal material is copper.
6. A method for testing adiabatic heat under a state of pressurizing a solid-state battery, characterized in that the adiabatic heat testing device under a state of pressurizing a solid-state battery provided in any one of claims 1 to 4 is adopted; The method comprises the following steps: attaching a thermocouple to the surface of the solid-state battery to be tested; The upper heat insulation cotton, the lower heat insulation cotton, the heating bottom plate, the heating pressing plate and the pressing device are adopted to fix the solid-state battery to be tested, and the solid-state battery is integrally placed in the cavity of the heat insulation simulation device; The initial temperature of the inner cavity of the heat insulation simulation device is adjusted to the initial temperature, and the measured solid-state battery is charged and discharged through charging and discharging equipment; In the charging and discharging process, the control system collects the temperature of the thermocouple in real time, and controls the temperatures of the heating bottom plate, the heating pressing plate, the pressing device and the cavity of the heat insulation simulation device to follow the temperature of the surface of the solid-state battery.
7. The method for thermally insulating a solid-state battery under pressure according to claim 6, wherein the upper heat insulating cotton, the lower heat insulating cotton, the heating base plate, the heating pressing plate and the pressing means are used for fixing the solid-state battery under pressure, comprising: The measured solid-state battery is clamped in the middle by adjusting the relative positions of the measured solid-state battery, the upper heat insulation cotton and the lower heat insulation cotton; The control system adjusts the pressure value of the pressing device to apply a set pressure to the solid-state battery under test.

Description

Method and device for thermally testing heat insulation capacity of solid-state battery under pressurized state Technical Field The application relates to the technical field of solid-state battery thermal test, in particular to a method and a device for thermally insulating thermal test under a pressurized state of a solid-state battery. Background The lithium ion battery adiabatic heat test is a test method for measuring the thermal characteristics and safety of a battery in the process of charging and discharging or abusing under adiabatic conditions (i.e. no heat is dissipated to the external environment), and aims to simulate the behavior of the battery under extreme conditions such as charging and discharging or abusing so as to evaluate the safety and the thermal stability of the battery. In the adiabatic calorimetric test, the heat generation rate and the heat generation amount thereof need to be obtained according to the temperature profile of the battery. Currently, the industry commonly uses adiabatic simulation devices to evaluate the safety of liquid lithium batteries, which test without additional pressurization of the liquid battery. However, solid state battery testing presents a unique challenge in that to ensure good cell interface contact, pressure must be applied using a clamp throughout the test. The clamp becomes an extra heat absorber in an adiabatic environment, and as the clamp does not generate heat, the heat generated by the battery can be continuously shunted, so that a temperature rise curve and key temperature parameters obtained by testing deviate from the actual values, and the accuracy of the result is reduced. In view of this, the present application has been proposed. Disclosure of Invention The application aims to provide a method and a device for testing adiabatic heat under a solid-state battery pressurization state, so as to improve the accuracy of adiabatic heat testing under the solid-state battery pressurization state. In order to achieve the above purpose, the present application adopts the following technical scheme: In a first aspect, the application provides a device for testing heat insulation and calorimetric under the state of pressurizing a solid-state battery, which comprises an upper heat insulation cotton, a lower heat insulation cotton, a heating bottom plate, a heating pressing plate, a pressing device, charge and discharge equipment, a thermocouple and a heat insulation simulation device; The tested solid-state battery is positioned between the upper heat insulation cotton and the lower heat insulation cotton; The heating bottom plate is arranged below the lower heat insulation cotton, and the heating pressing plate is arranged above the upper heat insulation cotton; The pressing device is used for fastening the heating pressing plate and the heating bottom plate and adjusting the pressure between the heating pressing plate and the heating bottom plate; The thermocouple is attached to the surface of the solid-state battery to be tested, and the temperature of the solid-state battery to be tested is transmitted to a control system of the heat insulation simulation device; the charge and discharge equipment is positioned outside the heat insulation simulation device, connected with the tested solid-state battery, and used for charging and discharging the tested solid-state battery and recording test data; Heating elements are arranged in the heating bottom plate, the heating pressing plate and the pressing device, and the heating bottom plate, the heating pressing plate and the pressing device are controlled by the control system to follow the surface temperature of the solid-state battery to be tested; The control system is used for controlling the temperature of the inner cavity of the heat insulation simulation device so as to realize the following of the surface temperature of the solid-state battery to be tested. In a second aspect, the present application provides a method for thermally testing the adiabatic quantity of a solid-state battery in a pressurized state, wherein a device for thermally testing the adiabatic quantity of the solid-state battery in the pressurized state is used; The method comprises the following steps: attaching a thermocouple to the surface of the solid-state battery to be tested; The upper heat insulation cotton, the lower heat insulation cotton, the heating bottom plate, the heating pressing plate and the pressing device are adopted to fix the solid-state battery to be tested, and the solid-state battery is integrally placed in the cavity of the heat insulation simulation device; The initial temperature of the inner cavity of the heat insulation simulation device is adjusted to the initial temperature, and the measured solid-state battery is charged and discharged through charging and discharging equipment; In the charging and discharging process, the control system collects the temperature of the thermocouple in real ti