Battery Temperature Control via Alternating Power Transfer
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Solution Overview
Problem
Existing systems for rapidly increasing battery temperature in hybrid vehicles and electric cars face challenges in ensuring battery safety and maintaining required voltage for motor operation, particularly with lithium-ion batteries, as they can be overcharged or over-discharged, leading to damage and insufficient driving torque due to fluctuations in voltage during temperature rise processes.
Innovation Solution
A system comprising a rechargeable battery, an accumulator, and a voltage converting unit controlled by a unit that alternately transfers electric power between the battery and the accumulator to manage battery voltage within safe limits, preventing overcharging or over-discharging, and optimizing frequency for maximum calorific power generation to rapidly increase battery temperature while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If large electric current flows through the battery during voltage rising and dropping operations at low temperature, then the battery temperature increases rapidly, but the battery voltage exceeds upper limit or becomes lower than lower limit causing battery damage
Solution Approach 1:
The patent applies periodic action by alternately performing voltage increasing operations and voltage dropping operations at an optimized frequency. This periodic switching creates repeated current flow cycles that generate heat through internal resistance while the optimized frequency prevents voltage from staying at extreme levels too long, thus raising temperature without causing overcharge or over-discharge damage
Solution Approach 2:
The patent changes the frequency parameter of the voltage conversion operations to optimize the balance between temperature rise and voltage stability. By adjusting this parameter, the system achieves sufficient calorific power generation while maintaining battery voltage within safe operating limits
2Temperature
If voltage increasing and dropping operations are performed repeatedly to raise battery temperature, then the battery temperature increases, but the driving voltage becomes insufficient to drive the motor at desired speed
Solution Approach 1:
The system uses periodic voltage increasing and dropping operations that are synchronized and frequency-optimized. This periodic action ensures that at any given moment, sufficient voltage is available for motor operation while the repeated cycles generate the necessary heat to raise battery temperature
Solution Approach 2:
The patent dynamically adjusts the operating mode of the voltage converting device based on real-time conditions. The system can switch between temperature increasing control and normal operation modes, and within temperature increasing control, it optimizes the frequency of operations dynamically to balance temperature rise with maintaining adequate driving voltage
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 system effectively prevents battery damage by maintaining voltage within safe limits and rapidly increases battery temperature, ensuring reliable driving voltage application to the motor, thus enhancing safety and performance.
Implementation Method 1
a change in the voltage of the battery is increased... a voltage of the battery, which is insufficient to drive the motor
Data Source
AI summary
A battery temperature rise causing system has a converting unit for converting voltage of electric power held in one of a rechargeable battery and an accumulator and applies the converted voltage to the other one, and a control unit controlling the converting unit to alternately perform first transfer of electric power from the battery to the accumulator and second transfer of electric power from the accumulator to the battery while changing the first transfer for the second transfer each time the battery voltage reaches a lower limit and changing the second transfer for the first transfer each time the battery voltage reaches an upper limit, and to increase temperature of the battery due to heat generated by electric current flowing through the battery during the electric power transfer.