Low-Voltage Battery Pack Heating Loops for Safer EV Preheating
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Solution Overview
Problem
Existing electric vehicle battery heating systems face safety issues due to high-voltage power supply, which can lead to high-voltage breakdown, ignition, and other undesirable phenomena, and are costly to implement.
Innovation Solution
A heatable battery pack design where each battery performs low-voltage power supply on respective heaters, eliminating the need for high-voltage power supply by the drive module, and using low-voltage wiring harnesses to connect batteries, switches, and heaters, with independent heating loops for each battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-voltage power supply is used to heat batteries through series connection of heaters and drive module, then heating efficiency is improved, but safety deteriorates due to high-voltage breakdown and ignition risks
Solution Approach 1:
The patent divides the heating system into independent battery packs, each with its own heater and control circuitry. Instead of one centralized high-voltage system, each battery pack operates independently with low-voltage power supply, segmenting the high-voltage risk across multiple isolated low-voltage units.
Solution Approach 2:
The patent introduces a DC-DC converter as an intermediary device that converts high-voltage power from the drive module into low-voltage power for the heaters. This intermediary transforms the electrical parameters, allowing high-voltage energy source to safely power low-voltage heating circuits through controlled conversion.
2Power
If high-voltage wiring harness is used to connect heaters to drive module, then power supply capability is improved, but cost deteriorates due to expensive high-voltage components and safety requirements
Solution Approach 1:
The patent changes the electrical parameters of the heating system from high-voltage to low-voltage operation. By using DC-DC conversion to step down the voltage, the system can use inexpensive low-voltage wiring harnesses and components instead of costly high-voltage rated components, while still achieving adequate heating power through increased current.
3Device complexity
If centralized high-voltage power supply is used for all heaters, then system complexity is reduced, but adaptability deteriorates as battery packs cannot be independently configured
Solution Approach 1:
The patent segments the heating control system into independent battery pack units, each capable of autonomous low-voltage power supply to its own heater. This segmentation allows individual battery packs to be added, removed, or configured independently without affecting other packs, enhancing system adaptability while maintaining manageable complexity through modular design.
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
This design significantly enhances power supply safety, reduces costs, and allows for flexible battery pack configuration without high-voltage wiring, preventing overheating and potential accidents.
Implementation Method 1
a heater; the battery, the first switch module, and the heater are connected in series to form a heating loop
Data Source
AI summary
The present application provides a heatable battery pack, a heatable battery system and a vehicle having thereof. The heatable battery pack includes a battery, a first switch module, and a heater that are connected in series to form a heating loop. The first switch module turns on the heating loop after a drive signal is received. Compared with the related art in which heaters in various battery packs are connected in series to both ends of a drive module in a high-voltage box, so as to perform high-voltage power supply on the heaters by the high-voltage box through a series loop, the present application directly performs low-voltage power supply on respective heaters by batteries in the battery packs, and the high-voltage power supply by the drive module is not required, which significantly improves the safety of power supply.