Battery Module Thermistor Compression for Accurate Cell Temperature

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing battery modules struggle to accurately detect internal battery temperatures, leading to premature power limiting and reduced performance under high power discharge conditions due to temperature differences between the connecting sheet and the internal battery.

Innovation Solution

A battery module structure that includes a thermistor compressing mechanism, where the thermistor is electrically connected to a circuit board and compressed against the top cover of the battery, allowing for accurate temperature acquisition that reflects the internal battery temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the thermistor is arranged on the flexible circuit board to acquire temperature on the connecting sheet, then the temperature acquisition structure is simple, but the temperature difference between connecting sheet and internal battery causes premature power limiting under high discharge rates

Engineering Contradiction:

Improvetemperature acquisition structureVSAvoidpower output reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A heat-conducting plate is introduced as an intermediary component between the thermistor and the battery pack. The heat-conducting plate conducts heat from the battery pack to the thermistor, enabling accurate internal temperature measurement without direct contact with the battery cells. This resolves the contradiction by maintaining structural simplicity while achieving reliable temperature detection that reflects actual internal battery conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of stationary object

If the width and thickness of the connecting sheet are limited due to internal space constraints, then the manufacturing cost and space utilization are optimized, but the temperature of the connecting sheet rises sharply under high discharge rates

Engineering Contradiction:

Improveinternal space utilizationVSAvoidconnecting sheet temperature

Core Design Contradiction:

Volume of stationary objectVSTemperature

Solution Approach 1:

The temperature measurement function is extracted from the connecting sheet and relocated to a dedicated thermistor positioned on the heat-conducting plate. This separation allows the connecting sheet to maintain its compact dimensions for space optimization while the thermistor independently measures the actual battery temperature, preventing premature power limiting caused by connecting sheet temperature rise.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If the thermistor compresses the top cover directly, then the temperature acquisition is direct, but the structure lacks stability and the thermistor may be damaged

Engineering Contradiction:

Improvetemperature acquisition speedVSAvoidthermistor durability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

A cushioning structure is designed between the thermistor and the top cover, where the heat-conducting plate serves as a buffer that distributes compression force. The elastic component provides pre-compression that maintains thermal contact while protecting the thermistor from excessive force. This resolves the contradiction by maintaining rapid temperature acquisition through direct contact while ensuring thermistor durability through force distribution.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 solution enables rapid and accurate temperature acquisition, reducing the likelihood of premature power limiting and enhancing the overall performance and reliability of the battery module, particularly under high power discharge conditions.

Implementation Method 1

the thermistor compresses the top cover... enables rapid and accurate temperature acquisition

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the compressing piece compresses the thermistor, so that the thermistor compresses the top cover

Methodology Applied

Scientific EffectMechanical compression: Compression

Data Source

PatentUS12288855B2Battery module and battery pack

Publication Date: 2025.04.29 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

A battery module as provided includes a battery, a wiring harness board, a circuit board, a compressing piece and a temperature acquisition assembly. The battery includes a top cover. The wiring harness board is arranged on an outer side of the top of the top cover. The circuit board is arranged on a side, away from the battery, of the wiring harness board. The compressing piece is mounted on the wiring harness board. The temperature acquisition assembly includes a thermistor, and the thermistor is electrically connected to the circuit board. The compressing piece compresses the thermistor of the temperature acquisition assembly, so that the thermistor compresses the top cover. The temperature acquisition assembly acquires a temperature of the top cover of the battery, with a short temperature transfer path and rapid temperature transfer response.