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Identification method of internal thermophysical parameters of prismatic lithium-ion battery

A technology for lithium-ion batteries and thermal physical properties, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as inability to identify thermal properties of batteries, achieve simple and convenient acquisition and calculation, and simple and effective acquisition of thermal parameters. Guaranteed effect of accuracy

Active Publication Date: 2021-11-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the method of directly obtaining the analytical solution of the heat transfer model equation in the existing battery thermophysical parameter identification method is to identify the overall parameters of the battery and cannot identify the thermophysical properties inside the battery
A method for identifying thermal and physical parameters inside a prismatic lithium-ion battery is now provided

Method used

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  • Identification method of internal thermophysical parameters of prismatic lithium-ion battery
  • Identification method of internal thermophysical parameters of prismatic lithium-ion battery
  • Identification method of internal thermophysical parameters of prismatic lithium-ion battery

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specific Embodiment approach 1

[0029] Specific implementation mode one: refer to figure 1 and figure 2 This embodiment is specifically described. The method for identifying thermal and physical parameters inside a square lithium-ion battery described in this embodiment includes the following steps:

[0030] Step 1. Place the square heater (2) between two square lithium-ion batteries of the same type, and place a thermocouple at the center of the two battery casings to detect the temperature, and place the square heater (2) ), two square lithium-ion batteries and two thermocouples are placed in an adiabatic environment, thereby simplifying the heat transfer process into a one-dimensional heat conduction process along the thickness direction of the battery;

[0031] Step 2. According to the quality of two square lithium-ion battery shells, the constant pressure specific heat capacity of the battery shell, the internal mass of the battery, the heating power of the battery and the temperature of the battery a...

specific Embodiment approach 2

[0046] Specific embodiment 2: This embodiment is to further explain the identification method of thermal physical property parameters inside the square lithium-ion battery described in specific embodiment 1. In this embodiment, in step 2, the specific heat capacity C at constant pressure inside the battery is obtained P2 The specific process is:

[0047] Place a thermocouple in the center of the two battery cases to detect the temperature change of the battery case. According to the relationship between the case on both sides of a lithium-ion battery and the internal mass m and the temperature with the heating time:

[0048]

[0049] Obtain the constant pressure specific heat capacity C P ,

[0050] In the formula, Q is the heat absorbed or released, and ΔT is the change in temperature;

[0051] Considering that the thermal parameters of the battery casing and the interior are different, there is a formula:

[0052]

[0053] In the formula, m 1 with m 3 are the mass...

specific Embodiment approach 3

[0057] Specific embodiment 3: This embodiment is to further explain the identification method of thermal physical property parameters inside the square lithium-ion battery described in specific embodiment 1. In this embodiment, the size of the square heating plate in step 1 is in contact with the lithium-ion battery Face size is the same.

[0058] In this embodiment, the use of a square heating sheet consistent with the size of the side of the battery can shield the lateral thermal conductivity when identifying the longitudinal thermal conductivity, simplifying the entire heat conduction process to one-dimensional heat conduction.

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Abstract

The invention discloses a method for identifying thermal and physical parameters inside a square lithium-ion battery, relating to the field of lithium-ion batteries. The present invention aims to solve the problem that the methods for directly obtaining the analytical solution of the heat transfer model equation in the existing battery thermophysical parameter identification methods all identify the overall parameters of the battery, but cannot identify the thermophysical properties inside the battery. According to the battery shell and internal mass, shell constant pressure specific heat capacity, heating power and the relationship between the temperature of the battery and the heating time, the constant pressure specific heat capacity inside the battery is obtained; according to the heat transfer process, specific heat capacity and boundary conditions, the longitudinal thermal conductivity inside the battery is obtained; Use two thermocouples on each battery casing to obtain two temperatures, and use the longitudinal thermal conductivity and heat transfer model to obtain the temperature of two temperature points on the same thickness inside the lithium-ion battery casing; use the two temperature points and Boundary conditions, according to the heat transfer model to obtain the lateral thermal conductivity of the material inside the battery. It is used to identify the thermal and physical parameters inside the battery.

Description

technical field [0001] The invention relates to a method for identifying thermal and physical property parameters inside a square lithium ion battery. It belongs to the field of lithium-ion batteries. Background technique [0002] As a new type of high-energy chemical power source, lithium-ion batteries have a series of advantages such as large specific energy, high charge and discharge efficiency, and environmental friendliness. They are widely used in consumer electronics, electric vehicles and other fields. They are a new generation of green energy storage devices. Its heat-related issues are related to battery performance, life, and safety, and have received full attention. At present, thermal simulation is an important means to study the thermal problems of lithium-ion batteries, and the correct identification of thermal and physical parameters of the battery is the key to thermal simulation. [0003] However, the thermal safety issue of lithium-ion batteries is very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00G01N25/20H01M10/615H01M10/6555
CPCY02E60/10
Inventor 吕超夏博妍绳亿张爽
Owner HARBIN INST OF TECH