Power Battery AC Self-Heating Loop With Redundant Connection Lines
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Solution Overview
Problem
Lithium-ion power batteries experience significant energy and power attenuation in low-temperature environments, necessitating heating to maintain performance, while ensuring safety remains a key challenge in self-heating processes.
Innovation Solution
A heating system for power batteries that includes an inverter, an alternating current motor, a first controller, and multiple connection lines, forming an alternating current self-heating loop, which enhances safety and stability by sharing excitation current through redundant connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single connection line is used for self-heating, then the circuit structure is simple, but the safety and stability are insufficient due to high current concentration
Solution Approach 1:
The patent divides the single connection line into multiple parallel connection lines (first connection line and second connection line), distributing the excitation current across multiple paths. This segmentation reduces current concentration on any single line, improving safety and stability while maintaining a relatively simple circuit structure through parallel configuration.
2Productivity
If high excitation current is applied for rapid heating, then heating performance is improved, but the risk of overheating and safety issues increases
Solution Approach 1:
By implementing multiple parallel connection lines, the patent segments the total excitation current into smaller individual currents. This allows rapid heating performance to be maintained through high total current while reducing overheating risk by distributing the thermal load across multiple conductors with better heat dissipation.
Solution Approach 2:
The patent incorporates protective components (such as fuses or circuit breakers) in the connection lines that provide beforehand cushioning against excessive current. These protective elements are designed to activate before dangerous overheating occurs, preventing safety issues while allowing high excitation current to be applied for rapid heating under normal conditions.
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 improves heating performance and safety of electric vehicles by reducing current on individual connection lines, preventing overheating, and ensuring continuous heating even if one connection line fails.
Implementation Method 1
The inverter and the alternating current motor form an alternating current self-heating loop with the power battery
Data Source
AI summary
A power battery comprises a first cell group and a second cell group connected in series. The heating system comprises an inverter, an AC motor, a first controller, and a plurality of connection lines. The midpoints of three bridge arms of the inverter are connected to the head ends of three-phase coils of the AC motor in a one-to-one correspondence. The tail ends of the AC motor are connected together to form a neutral point. First ends of the connection lines are connected to the neutral point of the AC motor. Second ends of the connection lines are connected to a connection point between the first cell group and the second cell group. The first controller is configured to input a drive signal to the inverter. The first cell group, the second cell group, the inverter, the AC motor, and the connection lines form an AC self-heating loop.