Battery Charge-Discharge Circuit for Low-Temperature Internal Heating
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Solution Overview
Problem
Traction batteries experience degraded discharge capacity and inability to charge in low-temperature environments, and conventional heating methods using motor circuits result in excessive noise due to vibration.
Innovation Solution
A charge/discharge circuit system that includes a power supply module, a heating module with an energy storage module and a switch module, allowing for alternate switching between charge and discharge loops to generate an alternating current, thereby heating the battery internally without using the motor for heating, thus reducing vibration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a motor circuit is used to heat the traction battery, then heating effect is achieved, but excessive vibration noise is produced
Solution Approach 1:
The patent extracts the motor from the heating circuit, separating the heating function from the motor. The heating is achieved through a dedicated charge/discharge circuit with switching modules that generate AC current to heat the battery internally, while the motor remains independent and can operate normally without vibration noise interference.
Solution Approach 2:
The patent introduces switching modules and energy storage components as intermediaries between the power supply and battery. These components generate AC current through controlled charging and discharging cycles, enabling internal battery heating without directly engaging the motor, thus eliminating vibration noise while maintaining heating effectiveness.
2Temperature
If the motor is used for heating, then heating function is provided, but the motor cannot drive the vehicle normally during heating
Solution Approach 1:
The patent segments the vehicle's power system into independent functional modules: a dedicated charge/discharge circuit for heating, an energy storage module, switching modules, and the motor drive system. This segmentation allows the heating function to operate independently without interfering with motor-driven vehicle operation, enabling both functions to coexist.
Solution Approach 2:
The switching modules and energy storage components serve multiple functions: they generate AC current for internal battery heating, enable controlled charging and discharging cycles, and can be integrated with the existing power management system. This multi-functionality allows the vehicle to maintain normal operation while performing heating without requiring separate dedicated components.
3Temperature
If conventional heating methods are used, then heating is achieved, but discharge capacity degrades in low-temperature environments
Solution Approach 1:
The patent employs periodic charging and discharging actions through controlled switching modules. The energy storage module charges and discharges in cycles, generating AC current that periodically flows through the battery. This periodic action prevents continuous high-current stress that would degrade discharge capacity, while still achieving effective heating through repeated charge/discharge cycles.
Solution Approach 2:
The battery heats itself through internal resistance generated by AC current flow from the charge/discharge circuit. This self-heating mechanism is more efficient and gentler than external heating methods, as the heat is generated within the battery terminals, ensuring uniform temperature distribution without damaging the battery structure or degrading discharge capacity.
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 heats the traction battery while minimizing vibration noise and allowing the motor to operate normally, enabling continuous vehicle operation during heating.
Implementation Method 1
a current of an alternating-current waveform flows through the at least first battery group in the power supply module, so that battery internal resistance of the at least first battery group generates heat
Data Source
AI summary
A charge/discharge circuit includes a power supply module including a battery group, a heating module including an energy storage module and a switch module, and a charge-discharge switching module. The battery group, the switch module, and the charge-discharge switching module are connected in parallel. A first terminal of the energy storage module is connected to the switch module, and a second terminal of the energy storage module is connected to the charge-discharge switching module. The charge-discharge switching module and the switch module are configured to produce a current of an alternating-current waveform in the charge/discharge circuit in response to a charge/discharge enable signal.