Method for carrying out in-situ solution on thermophysical parameters of cylindrical winding type lithium ion batteries

A technology of thermophysical parameters and power batteries, which is used in electrical digital data processing, special data processing applications, instruments, etc., to achieve in-situ and accurate results

Inactive Publication Date: 2018-06-15
SHANXI CHANGZHENG POWER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional method of obtaining the overall parameters through series-parallel calculation of the thermophysical parameters of each layer structure is not applicable,

Method used

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  • Method for carrying out in-situ solution on thermophysical parameters of cylindrical winding type lithium ion batteries
  • Method for carrying out in-situ solution on thermophysical parameters of cylindrical winding type lithium ion batteries
  • Method for carrying out in-situ solution on thermophysical parameters of cylindrical winding type lithium ion batteries

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0041] Such as Figure 1-3 As shown, a method for in-situ calculation of thermal and physical property parameters of a cylindrical wound lithium-ion power battery according to an embodiment of the present invention includes the following steps:

[0042] S1: First build the experimental device;

[0043] S2: Use an external heat source to heat the battery at a certain power, and measure the instantaneous temperature changes at multiple points on the battery;

[0044] S3: Establish a heat tran...

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Abstract

The invention discloses a method for carrying out in-situ on thermophysical parameters of cylindrical winding type lithium ion batteries. The method comprises the following specific steps of: firstly,building an experiment device, heating a battery by using an external heat source according to certain power, and measuring different instantaneous temperature changes of a plurality of points on thebattery; secondly, establishing a heat transfer model which comprises heat conductivity coefficient parameters and specific heat capacity parameters of the battery in different directions in simulation software, and calculating a numerical solution of temperature change at each thermocouple measuring points; and finally, fitting measured temperature values and simulated values, and obtaining specific data of thermophysical parameters of the battery. The method has the beneficial effect of considering wet type structures, namely, electrolyte, in real batteries and contact thermal resistance between different structure layers, so as to in-situ and correctly obtain important thermophysical parameters of batteries, such as heat conductivity coefficients and specific heat capacities.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an in-situ method for obtaining thermal and physical parameters of a cylindrical wound lithium-ion power battery. Background technique [0002] In the trial-and-error practice of enterprise production, the structure of power batteries has evolved into a variety of typical packaging forms. The thermal parameter characteristics of batteries between different configurations are very different, and they need to be treated differently. Among them, the cylindrical winding type is an important power battery configuration, such as the 18650 and 21700 batteries produced by Panasonic and supplied to Tesla's Model series electric vehicles. Sheets are stacked and wound. The advantages of cylindrical batteries include mature production technology, high product yield, and uniform specifications and models; but at the same time, the disadvantages are also obvious. The internal th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/08
Inventor 周伟男
Owner SHANXI CHANGZHENG POWER TECH CO LTD
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