Battery Module Temperature Monitoring via Heat Conduction Plate

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Solution Overview

Problem

The existing battery module technology faces challenges in accurately detecting the internal temperature of batteries, leading to premature power limitation due to temperature differences between the connecting piece and the internal battery, which affects discharge power performance, especially under high power conditions.

Innovation Solution

A battery module design that includes a temperature collecting component with a thermistor and heat conduction pad installed on the wire harness plate, directly abutting the top cover, allowing for accurate and rapid temperature transfer, reducing the temperature transfer path and enhancing control accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the temperature of the connecting piece is collected by the thermistor set on the flexible circuit board, then the temperature collection structure is simple, but the temperature difference between the connecting piece and the internal battery temperature causes premature power limitation

Engineering Contradiction:

Improvetemperature collection structureVSAvoidinternal battery temperature detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces a heat conduction plate as an intermediary component between the battery terminal and the thermistor. This heat conduction plate transfers heat from the battery terminal through its thickness direction, allowing the thermistor to detect the temperature at the battery terminal location rather than the connecting piece temperature, thereby accurately reflecting the internal battery temperature

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the direct mechanical contact temperature sensing method (thermistor on flexible circuit board contacting connecting piece) with a thermal field-based measurement approach. By using the heat conduction plate to establish a thermal pathway from the battery terminal to the thermistor, the system substitutes mechanical positioning accuracy with thermal field distribution for temperature measurement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Temperature

If the width and thickness of the connecting piece are increased to reduce temperature rise, then the temperature difference between connecting piece and internal battery is reduced, but the internal space size of the battery module is limited

Engineering Contradiction:

Improveconnecting piece temperatureVSAvoidbattery module internal space

Core Design Contradiction:

TemperatureVSVolume of stationary object

Solution Approach 1:

The patent extracts the temperature sensing function from the connecting piece itself and relocates it to the battery terminal area through the heat conduction plate. This allows the connecting piece to maintain its original dimensions without being constrained by temperature measurement requirements, as the temperature detection is now performed at the battery terminal where the heat conduction plate is positioned

Inventive Principle:

Principle #2Taking out (Extraction)

3Power

If a higher discharge rate is used to meet power requirements, then the discharge power is improved, but the temperature difference between connecting piece and internal battery rises sharply causing premature power limitation

Engineering Contradiction:

Improvedischarge powerVSAvoidinternal battery temperature detection accuracy

Core Design Contradiction:

PowerVSMeasurement precision

Solution Approach 1:

The heat conduction plate serves as a thermal intermediary that establishes a direct thermal pathway from the battery terminal to the thermistor. This allows accurate detection of battery terminal temperature even under high discharge rates, preventing premature power limitation by providing reliable temperature data that reflects actual battery conditions rather than connecting piece temperature

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures accurate temperature monitoring, reducing premature power limitations and optimizing battery module performance and vehicle equipment reliability by providing a consistent and timely reflection of internal battery temperature.

Implementation Method 1

a temperature collecting component, installed on the installation part, and located between the wire harness plate and the top cover; where the elastic pressing part is butted with the connecting piece, and the temperature collecting component is butted with the top cover

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS11652244B2Battery module and apparatus

Publication Date: 2023.05.16 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

The present application discloses a battery module and an apparatus, which relates to the field of battery technology and is used for optimizing the structure of the battery module. The battery module includes a battery, a connecting piece, a wire harness board and a temperature collecting component. The battery includes an electrode terminal and a top cover. The connecting piece is fixed with the electrode terminal; the wire harness plate is arranged on the top outside of the top cover, and is provided with an installation part and an elastic pressing part. The temperature collecting component is installed in the installation part and is located between the wire harness plate and the top cover. Among them, the elastic pressing part abuts against the connecting piece, and the temperature collecting component abuts against the top cover.