Auxiliary Battery Cooling Backup for EV Main Battery Shutdown

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Solution Overview

Problem

Existing battery systems face challenges in maintaining temperature stability during abnormal conditions, such as high temperatures, due to the interruption of power supply from the main battery.

Innovation Solution

A battery system comprising a main battery, an auxiliary battery, and a battery management device that controls power supply. The auxiliary battery supplies power to the cooling system's refrigerant circulation pump when the main battery's power is blocked, ensuring continued refrigerant circulation and temperature stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the main battery is blocked due to abnormality, then safety is improved by preventing further damage, but the cooling system stops operating and temperature stability deteriorates

Engineering Contradiction:

Improveabnormal state propagationVSAvoidbattery temperature stability

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The critical cooling function is extracted from the main battery power dependency and connected directly to the auxiliary battery. This extraction ensures that even when the main battery is blocked to prevent abnormal state propagation, the cooling system operates independently using auxiliary power, thereby maintaining temperature stability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The auxiliary battery acts as an intermediary power source between the main battery failure and the cooling system. It mediates the power supply interruption by providing an alternative power path that keeps the cooling system operational while the main battery remains blocked for safety.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If an auxiliary battery is added to the system, then temperature stability during abnormalities is improved, but device complexity increases

Engineering Contradiction:

Improvecooling system reliabilityVSAvoidbattery system structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The auxiliary battery is designed with multi-functionality to justify its inclusion. It serves as a backup power source for the cooling system, can be charged during normal operation from the main battery, and provides automatic failover capability. This universal design reduces the need for separate dedicated backup systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The auxiliary battery system is designed to be self-managing through automatic detection and switching mechanisms. The battery management device automatically monitors the main battery status and switches to auxiliary battery power when needed, without requiring manual intervention or complex control systems.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250038295A1Battery System and Method of Operating the Same

Publication Date: 2025.01.30 LG ENERGY SOLUTION LTD

AI summary

A battery system in an electric vehicle includes: a main battery; a battery management device that controls power supply from the main battery to be blocked when an abnormality has occurred in one or more components included in the electric vehicle; and an auxiliary battery provided separately from the main battery and that supplies power to one or more components provided in a cooling system that cools the main battery.