Method for testing specific heat capacity of lithium ion battery

A lithium-ion battery and testing method technology, applied in the field of specific heat capacity of lithium-ion batteries, can solve the problems of inability to obtain specific heat capacity changes, high test costs, and inability to conduct specific heat tests for large-scale batteries, and achieve low test costs, simple and convenient implementation, and Wide range of effects

Inactive Publication Date: 2014-04-09
TIANJIN LISHEN BATTERY
View PDF4 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the specific heat capacity test of lithium-ion batteries mainly relies on the accelerated calorimeter, but due to the size limitation of the sample pool of the accelerated calorimeter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing specific heat capacity of lithium ion battery
  • Method for testing specific heat capacity of lithium ion battery
  • Method for testing specific heat capacity of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Below, the substantive features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed examples.

[0034] The present invention will be described in detail below by taking 1C rate discharge as an example, and the other rate discharge methods are the same.

[0035] The present invention is realized through the following steps:

[0036] Step 1: Measure and record the open circuit voltage and surface temperature of the battery under different SOC states until the battery SOC=0, and perform regression analysis on the data of the battery open circuit voltage changing with the surface temperature under different SOC states to obtain the open circuit voltage of the battery u oc , The fitting relationship between the open circuit voltage temperature coefficient B and different discharge time t;

[0037] u oc =a 0 +a 1 *t+a 2 *t 2 +a 3 *t 3 +...+a f *t f Fo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for testing specific heat capacity of a lithium ion battery. The method comprises the following steps: measuring and recording open-circuit voltage and surface temperature of the battery in different SOC (State of Charge) states till the SOC of the battery is equal to 0, performing regression analysis on data representing that the open-circuit voltage of the battery changes along with the surface temperature in the different SOC states, so as to obtain a fitting relationship equation of the open-circuit voltage, open-circuit voltage temperature coefficients and different discharge times of the battery, calculating the open-circuit voltage and the open-circuit voltage temperature coefficients at different recorded time points in corresponding discharge by using the relationship equation, calculating heating power of the battery in discharge at each time point, calculating a released thermal value, calculating the SOC states of corresponding moments according to the discharge time and the discharge power so as to obtain the specific heat capacity in the different SOC states. The change of the specific heat capacity of the battery along with the SOC is obtained by using a method with the combination of experimental testing and statistics calculation, and the method is simple and convenient to execute, low in testing cost and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of specific heat capacity of lithium-ion batteries, and in particular relates to a test method for specific heat capacity of lithium-ion batteries. Background technique [0002] Lithium-based batteries are particularly favored by manufacturers of electric vehicles and electric mopeds because of their long service life, harmlessness to the environment, high specific energy, and high conversion rate. In the application of power battery packs, the thermal performance of lithium batteries is an important factor affecting the cycle life and safety of battery packs. [0003] At present, the specific heat capacity test of lithium-ion batteries mainly relies on the accelerated calorimeter, but due to the size limitation of the sample pool of the accelerated calorimeter equipment, the specific heat test for large-sized batteries cannot be carried out, the test cost is expensive, and the specific heat capacity during ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N25/20
Inventor 翟文波
Owner TIANJIN LISHEN BATTERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap