Soft-Packed Battery Equalizing Device Parallel Circuit
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Solution Overview
Problem
The inconsistency in decay rate and coulomb efficiency of lithium batteries in vehicle battery packs shortens their lifespan, and existing methods are inefficient for sorting and equalizing a large number of batteries, leading to suboptimal performance and reduced service life.
Innovation Solution
An equalizing device and method for vehicle soft-packed batteries that uses a parallel equalization circuit with a first-in first-out sequence, maintaining SOC within a preset range, and employing an annular conveying device and cell holding mechanism to facilitate efficient equalization of multiple batteries simultaneously, reducing space and cost while ensuring consistent SOC differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If batteries are sorted by self-discharge rate using traditional methods, then sorting accuracy can be achieved, but sorting efficiency is low and time consumption is high
Solution Approach 1:
The patent divides the battery sorting process into multiple parallel channels, where each channel independently measures and sorts batteries by self-discharge rate. This segmentation allows simultaneous processing of multiple batteries, dramatically improving sorting efficiency while maintaining measurement accuracy through dedicated measurement circuits in each channel.
Solution Approach 2:
The patent implements preliminary equalization before sorting by connecting batteries in parallel to allow spontaneous equalization of SOC differences. This preliminary action ensures that subsequent self-discharge rate measurements reflect true battery characteristics rather than transient SOC variations, improving sorting accuracy while the parallel architecture maintains high throughput.
2Productivity
If multiple batteries are equalized simultaneously using parallel equalization circuits, then equalization efficiency is improved, but ensuring consistent SOC differences becomes more difficult
Solution Approach 1:
The patent employs feedback control in each parallel equalization channel, where SOC measurement results are continuously monitored and used to adjust equalization current distribution. This feedback mechanism ensures that despite simultaneous operation of multiple channels, the SOC differences across all batteries remain consistent and within specified tolerances, maintaining manufacturing precision while achieving high equalization efficiency.
3Manufacturing precision
If traditional sequential equalization methods are used, then SOC consistency can be maintained, but sorting time increases and productivity decreases
Solution Approach 1:
The patent merges multiple equalization and measurement operations into a single integrated parallel system. Multiple batteries undergo equalization and self-discharge rate measurement simultaneously in separate but coordinated channels, combining the benefits of sequential processing (SOC consistency) with parallel processing (reduced time), thereby resolving the contradiction between precision and time loss.
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
The solution significantly improves sorting efficiency, reduces sorting time, and allows for the equalization of a large number of batteries, maintaining consistent SOC differences and extending the lifespan of battery packs by ensuring consistent decay rates and coulomb efficiency.
Implementation Method 1
Sorting circuits are connected in parallel, and equalization can be carried out spontaneously in different circuits of the battery SOC. Therefore, when a battery cell with a larger self-discharge rate exists in the battery cell connected to the sorting circuit, extremely small self-equalizing current can be observed in a parallel branch to flow to a battery cell with a large self-discharge rate.
Implementation Method 2
The self-discharge rate of the lithium battery refers to the phenomenon of spontaneous loss of battery capacity in an open circuit state. The batteries can thus be sorted by observing the extent to which the capacity of the battery is lost over a period of time.
Data Source
AI summary
The invention provides an equalizing device for a vehicle soft-packed battery and an equalizing method for the soft-packed battery. According to the equalizing method for the vehicle soft-packed battery, a battery to be equalized is connected to a parallel equalization circuit by using an equalizing device for a vehicle soft-packed battery, battery cells to be equalized are sequentially equalized by adopting a first-in first-out sequence, and the SOC of each cell equalized is maintained within a preset range; and the number of the cells entering the equalizing device for the vehicle soft-packed battery is N, and the equalizing time of the battery cells is T. The equalizing device for the vehicle soft-packed battery comprises a holder clamping type or a copper sheet compressing type. On the premise of remarkably improving the equalizing efficiency of the battery cell, the invention can reduce the space and cost required by the equalizing operation, and ensure that the SOC difference of the equalized battery cell is maintained within a certain range, and it is a low-cost high-efficiency battery cell equalizing device. The invention is suitable for equalizing a large number of battery cells on a production line.