Battery Lower Plate Surface for Wide-Area Heat Conduction

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Solution Overview

Problem

Existing power supply devices face challenges in achieving an ideal contact state between the lower plate and the heat conductive sheet, hindering effective heat radiation from battery cells, which can lead to temperature rise, reduced battery life, and safety issues.

Innovation Solution

The power supply device incorporates a lower plate with a regular uneven surface that allows the heat conductive sheet to be stacked in a pressed state, deforming into a concave shape, ensuring a wide contact area and efficient heat transfer by maintaining contact even with non-parallel surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a heat conductive sheet is stacked on a lower plate with a wide area to achieve favorable contact state, then heat radiation efficiency is improved, but it becomes considerably difficult to bring the heat conductive sheet and lower plate into contact over the wide area in assembly step or in-use state

Engineering Contradiction:

Improveheat radiation efficiencyVSAvoidcontact state achievement difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The lower plate is designed with a curved surface (concave or convex) instead of a flat surface. This curvature allows the heat conductive sheet to conform to the surface shape and achieve favorable contact state over the wide area, resolving the contradiction between wide contact area and contact difficulty.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention changes the surface geometry parameter of the lower plate from flat to curved. This parameter change enables the heat conductive sheet to make good contact over a wide area by deforming to match the curved surface, thereby improving heat radiation efficiency while maintaining ease of assembly.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If the lower plate and heat conductive sheet are brought into favorable contact state for efficient heat radiation, then temperature control of battery cells is improved, but requires precise contact state that is difficult to maintain

Engineering Contradiction:

Improvebattery cell temperature controlVSAvoidcontact state precision

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The curved surface of the lower plate allows the heat conductive sheet to naturally conform to the shape, creating a favorable contact state that is more tolerant of assembly variations. This reduces the manufacturing precision requirements while maintaining good thermal contact for effective temperature control.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The heat conductive sheet acts as a flexible element that can deform to match the curved surface of the lower plate. This flexibility enables the sheet to maintain good contact over the curved surface without requiring precise alignment or flat surfaces, thereby improving temperature control while reducing manufacturing precision demands.

Inventive Principle:

Principle #30Flexible shells and thin films

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 configuration ensures uniform and efficient heat radiation from battery cells, reducing temperature differences and enhancing the safety and reliability of the power supply device by preventing abnormal temperature rises.

Implementation Method 1

heat conductive sheet 17 being stacked on a surface of lower plate 16, heat conductive sheet 17 having plasticity... lower plate 16 being brought into contact with heat radiation surfaces 1X of battery cells 1 forming battery stack 10, lower plate 16 allowing transfer of heat energy generated by battery cells 1 through lower plate 16

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP4009418B1Power supply device, electric vehicle comprising said power supply device, and power storage device

Publication Date: 2026.01.21 SANYO ELECTRIC CO LTD

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AI summary

In order to efficiently radiate heat generated by a battery cell by a lower plate, power supply device (100) includes: battery stack formed by stacking a plurality of battery cells (1); a pair of end plates disposed at both ends of the battery stack; binding bars configured to connect the pair of end plates; lower plate (16) that is brought into contact with heat radiation surfaces (1X) of battery cells (1) forming the battery stack and to which heat energy of battery cell (1) is transferred; and heat conductive sheet (17) having plasticity and stacked on a surface of lower plate (16). In lower plate (16), contact surface (16a) that is brought into contact with heat conductive sheet (17) is regular uneven surface (16X), heat conductive sheet (17) is stacked on uneven surface (16X) in a pressed state, heat conductive surface (17X) of heat conductive sheet (17) is deformed into a concave shape along uneven surface (16X), and heat conductive sheet (17) and lower plate (16) are stacked on each other in a contact state.