Battery Charging Rate Modulation Around Critical SOC Swelling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery safety and service life are compromised due to swelling during charging, as the battery experiences a large expansion force when the state of charge reaches a certain value, leading to reduced performance and lifespan.
Innovation Solution
A battery charging method that adjusts the charge rate within specific SOC ranges to manage the expansion force, reducing the charge rate when the SOC is near a critical value and increasing it when exceeded, thereby maintaining a low expansion force and improving charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charge rate is increased to improve charging efficiency, then the charging speed is improved, but the expansion force of the battery increases causing electrode plate bending and reduced service life
Solution Approach 1:
The patent applies dynamics by making the charge rate adjustable and variable during the charging process. The charge rate is dynamically changed based on the battery's state of charge (SOC) and expansion force conditions. Specifically, the charge rate is adjusted down when SOC reaches a first threshold value and adjusted up when SOC reaches a second threshold value, allowing the system to adapt to changing battery conditions rather than maintaining a fixed charge rate
Solution Approach 2:
The patent applies parameter changes by modifying the charge rate parameter in response to changes in battery SOC and expansion force. The system monitors battery parameters and adjusts the charge rate parameter accordingly - reducing it when expansion force becomes excessive (at first threshold SOC) and increasing it when conditions improve (at second threshold SOC), thereby optimizing both charging efficiency and battery longevity
2Reliability
If the charge rate is reduced to decrease expansion force, then the battery service life is prolonged, but the charging efficiency is reduced
Solution Approach 1:
The patent applies periodic action through cyclic adjustments of the charge rate based on the battery's charging state. The charge rate is periodically reduced when SOC reaches the first threshold value and periodically increased when SOC reaches the second threshold value. This periodic modulation of the charge rate allows the battery to experience reduced expansion force at critical SOC levels while maintaining higher charge rates during safer SOC ranges, thereby balancing service life extension with charging efficiency
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present application discloses a battery charging method, a battery, and an electrical device. The charging method includes: during charging of a battery, upon determining that a state of charge (SOC) of the battery reaches a first SOC range, adjusting a charge rate of the battery down to a second charge rate from a first charge rate within a range from a minimum boundary value of the first SOC range to a first set SOC, and adjusting the charge rate of the battery up to the first charge rate or a third charge rate from the second charge rate within a range from the first set SOC to a maximum boundary value of the first SOC range. In the present application, when the SOC is close to the first set SOC in the first SOC range, the battery is charged at a low charge rate, which reduces the expansion force of the battery, and thus prolongs the service life of the battery.