Battery Cell Balancing via Pulse Discharge to Suppress Dendrites
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Solution Overview
Problem
Existing rechargeable batteries face challenges with dendrite growth, which can lead to battery cell short circuits and potential battery cell ignition, and may cause the battery cell to ignite.
Innovation Solution
A cell balancing method and device that includes a storage device that stores a balancing profile for cell balancing, and a balancing device configured to perform pulse discharge for a balancing target battery cell selected from among the plurality of battery cells, with a balancing resistor and a balancing switch for each of the battery module, and a balancing controller configured to control the balancing device to perform pulse discharge for a balancing target battery cell selected from among the battery cells, with a balancing resistor and a balancing switch for each of the battery pack, and a balancing controller configured to control the balancing device to suppress dendrite growth through cell balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous discharge is performed for cell balancing, then cell balancing efficiency is improved, but dendrite growth is promoted
Solution Approach 1:
The patent applies periodic action by switching the balancing discharge between continuous discharge mode and pulse discharge mode at predetermined time intervals. This periodic alternation allows the system to achieve both high cell balancing efficiency during continuous discharge periods and dendrite suppression during pulse discharge periods, resolving the contradiction between balancing efficiency and dendrite growth prevention
2Object-generated harmful factors
If pulse discharge is performed to suppress dendrite growth, then dendrite formation is reduced, but cell balancing efficiency decreases
Solution Approach 1:
The patent uses periodic action by implementing alternating periods of continuous discharge and pulse discharge. During continuous discharge periods, cell balancing efficiency is maximized, while during pulse discharge periods, dendrite growth is suppressed. This time-based periodic alternation resolves the contradiction by allowing each mode to excel at its primary function
3Loss of time
If high current discharge is applied for fast cell balancing, then balancing time is reduced, but dendrite growth is accelerated
Solution Approach 1:
The patent applies periodic action by alternating between continuous discharge mode (which provides fast balancing with higher current) and pulse discharge mode (which suppresses dendrite growth). This periodic alternation allows the system to achieve fast overall balancing while periodically interrupting dendrite formation processes
Solution Approach 2:
The patent applies preliminary action by performing pulse discharge at predetermined time intervals during the cell balancing process. These preliminary pulse interventions prevent dendrite growth before it can become excessive, allowing continuous discharge to proceed at high current without causing severe dendrite formation
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 method and device effectively suppress dendrite growth and enhance battery cell balancing efficiency by suppressing dendrite formation and promoting dendrite growth, thereby increasing the balancing efficiency of the battery pack.
Implementation Method 1
a first controller configured to control the balancing device to perform pulse discharge for a balancing target battery cell selected from among the plurality of battery cells
Implementation Method 2
The balancing profile may include a pulse period and a duty cycle set based on a natural frequency of a dendrite
Data Source
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AI summary
The present disclosure relates to a cell balancing method and a cell balancing device performing the cell balancing method, and a battery pack. The cell balancing device may include: a storage device that storage a balancing profile for cell balancing; a balancing device configured to perform a discharge function for cell balancing of a plurality of battery cells; and a first controller configured to control the balancing device to perform pulse discharge for a balancing target battery cell selected from among the plurality of battery cells referring to the balancing profile if the cell balancing is required. The balancing profile may include a pulse period and a duty cycle set based on a natural frequency of a dendrite. The balancing device may be further configured to perform the pulse discharge according to a pulse signal that satisfies the pulse period and the duty cycle.