Backup Battery Split Charging to Minimize Temperature Variation
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Solution Overview
Problem
Backup power supply devices experience a shortened dischargeable time due to variations in secondary battery temperatures, particularly when some batteries are exposed to high temperatures during supplementary charging, leading to localized degradation and reduced backup time.
Innovation Solution
A charging method that involves simultaneous initial supplementary charging of all secondary batteries, acquiring peak temperatures, listing and predicting temperature variations for split charging groups, and optimizing the charging pattern to minimize temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If supplementary charging is performed at a low rate on a regular basis, then the power corresponding to natural discharging is supplemented, but secondary batteries are exposed to high-temperature state for a relatively long period of time, causing localized degradation and shortened dischargeable time
Solution Approach 1:
The patent divides the plurality of secondary batteries into multiple charging groups and performs charging in a time-divided manner rather than charging all batteries simultaneously. This segmentation allows heat generation to be distributed across different time periods, preventing any single battery from being exposed to high temperatures for extended periods, thereby reducing localized degradation and maintaining dischargeable time.
Solution Approach 2:
The patent implements periodic charging by alternating between different charging groups in cycles. First charging group charges while second charging group rests, then they switch. This periodic action prevents continuous high-temperature exposure for individual batteries, allowing heat dissipation during rest periods and maintaining overall system performance and dischargeable time.
2Device complexity
If all secondary batteries are charged simultaneously, then charging process is simple, but temperature variation among batteries increases, leading to localized degradation
Solution Approach 1:
The patent segments the battery group into multiple charging groups with different charging schedules. This segmentation creates temperature differentiation that is controlled and managed, preventing uniform high-temperature exposure that would cause localized degradation. The segmentation approach maintains acceptable charging control complexity while significantly improving degradation uniformity.
Solution Approach 2:
The patent applies different charging strategies to different local groups of batteries. By assigning different charging timings and rates to different charging groups based on their specific conditions, the system achieves more uniform degradation across all batteries. This local quality approach allows tailored charging that prevents any single battery from becoming a weak link.
3Reliability
If voltage adjustment is performed according to degradation state, then voltage variation is managed, but temperature variation itself is not curbed, allowing degradation factors to concentrate on specific batteries
Solution Approach 1:
The patent performs preliminary temperature management through time-divided charging before degradation can concentrate on specific batteries. By controlling the charging schedule in advance and distributing heat generation across different time periods, the system prevents temperature variation from reaching levels that would cause localized degradation, complementing voltage adjustment measures.
Solution Approach 2:
The patent introduces charging schedule timing as an intermediary control mechanism between voltage adjustment and temperature management. By using time-based separation of charging groups, the system mediates the relationship between voltage stability and temperature control, allowing both parameters to be managed effectively without one compromising the other.
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 curbs the localization of degradation in specific batteries by minimizing temperature variations, thereby extending the dischargeable time and ensuring consistent performance during power interruptions.
Implementation Method 1
a temperature sensor that individually measures temperatures of the plurality of secondary batteries
Implementation Method 2
a variation may occur in temperature of each of the plurality of secondary batteries due to arrangement inside a casing and an influence of a cooling mechanism
Data Source
AI summary
A charging method for supplementarily charging a plurality of secondary batteries accommodated in a casing on a regular basis includes the steps of: charging the plurality of secondary batteries at the same time at the time of initial supplementary charging; acquiring each of peak temperatures during charging of the plurality of secondary batteries; listing combination patterns when the plurality of secondary batteries are split into a plurality of charging groups; predicting, for each of the combination patterns, each of the peak temperatures in a case in which charging is performed for each of the charging groups, on the basis of the peak temperatures at the time of the initial supplementary charging; and split-charging the plurality of secondary batteries in the combination pattern that minimizes a variation in the predicted peak temperatures.