Battery Pulsed Heating Durability Testing Without Long Cold Soak
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Solution Overview
Problem
Traditional power battery durability tests require a long period of standing at low temperature between charge and discharge processes, leading to a lengthy test duration.
Innovation Solution
A durability test method involving pulsed heating of batteries until stable temperature is reached, followed by adjusting the temperature and measuring capacity degradation, allowing for efficient determination of battery durability without prolonged low-temperature standing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power battery durability test uses multiple charge and discharge cycles with low temperature standing, then battery capacity degradation can be detected, but the test period becomes excessively long
Solution Approach 1:
The patent applies periodic pulsed heating action instead of continuous low-temperature standing. The battery undergoes repeated heating pulses with specific duty cycles, creating periodic thermal stress that accelerates degradation mechanisms. This periodic thermal action achieves degradation detection much faster than traditional continuous low-temperature testing.
Solution Approach 2:
The patent changes the test parameters from low-temperature standing conditions to pulsed heating conditions. By controlling heating temperature, pulse width, and duty cycle, the test accelerates battery degradation while maintaining measurement capability. This parameter transformation converts a slow degradation process into a faster, controllable degradation process.
2Stability of the object's composition
If traditional test requires long low temperature standing between charge and discharge, then battery stability can be ensured, but test efficiency decreases
Solution Approach 1:
Instead of long low-temperature standing periods, the patent uses periodic pulsed heating with controlled duty cycles. The heating pulses are applied periodically during charge and discharge cycles, maintaining battery stability through controlled thermal cycles rather than prolonged static low-temperature conditions. This increases test efficiency while preserving stability assessment.
Solution Approach 2:
The patent eliminates idle low-temperature standing time by continuously applying useful pulsed heating action during the test process. The heating pulses are integrated into the charge-discharge cycles, ensuring that every phase of the test contributes to degradation acceleration rather than merely waiting for thermal equilibrium.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces test time and allows for the evaluation of battery durability by continuously heating the battery to stable temperature, thereby saving time and accurately assessing temperature's influence on battery performance.
Implementation Method 1
performing pulsed heating of the battery to be tested under first pulse parameters until the pulsed heating time reaches the preset pulse duration
Implementation Method 2
putting the battery to be tested into a temperature chamber, and setting the temperature of the temperature chamber at a first temperature value
Data Source
AI summary
A lithium-ion battery to be tested is put into a temperature chamber at a first temperature value and subjected to pulsed heating until the pulsed heating time reaches the preset pulse duration. The chamber temperature is adjusted to a second value and a capacity degradation value of the battery is obtained, so as to obtain durability of the battery. Before testing of the capacity degradation value of the battery, continuous pulsed heating is conducted. After the battery is heated for a period of time, the temperature elevation and heat dissipation of the battery will reach stable values and the temperature will no longer rise. Such pulsed heating does not require a long period of standing at low temperature. Therefore, a large amount of test time can be saved, the test period shortened, and the influence of battery temperature on battery durability can be verified through a large number of experiments.