Battery Self-Heating Loop Using Inverter-Motor AC Excitation
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Solution Overview
Problem
Lithium-ion power batteries experience significant energy and power attenuation in low-temperature environments, necessitating effective heating solutions to maintain performance.
Innovation Solution
A heating system for power batteries that utilizes an alternating-current self-heating loop, comprising an inverter, an alternating-current motor, and a controller, to generate heat by alternately charging and discharging battery core groups connected in series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a larger excitation current is used for self-heating, then heating performance is improved, but charge quantity loss errors increase
Solution Approach 1:
The system implements feedback control by monitoring the electromotive force difference between battery core groups and dynamically adjusting the excitation current distribution. The controller receives real-time data on charge quantity loss errors and modifies the heating current allocation to compensate for these errors, ensuring that battery groups with higher loss receive proportionally more heating current to maintain thermal balance.
Solution Approach 2:
The system dynamically adjusts the excitation current distribution based on real-time battery state monitoring. Rather than applying uniform current, the controller continuously adapts the current allocation to each battery core group based on their individual electromotive force differences and charge quantity loss characteristics, optimizing heating efficiency while minimizing energy waste.
2Device complexity
If self-heating is performed without considering electromotive force differences, then heating process is simplified, but battery balance is compromised
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor electromotive force differences between series-connected battery core groups. This feedback enables the controller to automatically adjust excitation current distribution, ensuring that battery groups with different electromotive forces receive appropriate heating current to maintain overall battery pack balance without requiring complex manual intervention.
Solution Approach 2:
The battery heating system performs self-regulation by automatically detecting electromotive force differences and adjusting its own current distribution. The system serves itself by using its own monitoring capabilities to identify imbalances and correct them through adaptive current allocation, eliminating the need for external complex control systems while maintaining battery balance.
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 enhances heating performance by allowing a larger excitation current, reducing charge quantity loss errors, and maintaining battery balance, thereby improving the available electric charge and endurance mileage of electric vehicles.
Implementation Method 1
generate heat by alternately charging and discharging battery core groups connected in series
Implementation Method 2
A heating system for power batteries that utilizes an alternating-current self-heating loop, comprising an inverter, an alternating-current motor
Data Source
AI summary
A power battery comprises a first battery cell group and a second battery cell group that are not equal in electromotive force and connected in series. The heating system comprises an inverter, an alternating-current motor, and a first controller. Midpoints of three bridge arms of the inverter are connected to head ends of three-phase coils of the motor in a one-to-one correspondence manner, and tail ends of the motor are connected together to form a neutral point. The neutral point is connected to a first connection point by means of a connection line, and the first connection point is a connection point between the first and second battery cell groups. The first controller is used for inputting a driving signal to the inverter. The first battery cell group, the second battery cell group, the inverter, the motor, and the connection line form an alternating-current self-heating loop.