Temperature Control Element for Lithium-Ion Battery Thermal Management

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Solution Overview

Problem

Existing temperature control systems for lithium-ion batteries are inadequate as they fail to provide effective thermal conditioning across the entire operational temperature range of -10 °C to 40 °C, and they lack sufficient electrical insulation, leading to reduced service life and efficiency at higher temperatures and decreased performance at lower temperatures.

Innovation Solution

A temperature control element combining a metal plate with elevations for thermal conductivity and a plastic base body for electrical insulation, forming channels for a temperature control medium, which allows for both cooling and heating of lithium-ion batteries, ensuring optimal temperature control across a wide range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If metal tubes with metal plates are used for cooling lithium-ion batteries, then thermal conductivity is improved, but electrical insulation deteriorates

Engineering Contradiction:
Improvethermal conductivityVSAvoidelectrical insulation
Core Design Contradiction:
TemperatureVSReliability

Solution Approach 1:

The patent employs a composite structure combining a metal plate (aluminum or aluminum alloy) for thermal conductivity with a plastic base body (electrically insulating material) for electrical insulation. The metal plate is embedded in the plastic base body, creating a composite temperature control element that simultaneously achieves both thermal conductivity and electrical insulation requirements.

Inventive Principle:
Principle #40Composite materials

2Reliability

If electrically insulating materials like plastic are used for cooling plates, then electrical insulation is improved, but heat transfer deteriorates

Engineering Contradiction:
Improveelectrical insulationVSAvoidheat transfer
Core Design Contradiction:
ReliabilityVSTemperature

Solution Approach 1:

The invention creates a composite temperature control element where a metal plate with high thermal conductivity is embedded within an electrically insulating plastic base body. This composite structure allows the metal plate to efficiently transfer heat while the surrounding plastic material provides the necessary electrical insulation, resolving the contradiction between heat transfer efficiency and electrical insulation.

Inventive Principle:
Principle #40Composite materials

3Temperature

If metal plates are soldered to metal tubes, then thermal conductivity is improved, but manufacturing complexity increases

Engineering Contradiction:
Improvethermal conductivityVSAvoidmanufacturing process
Core Design Contradiction:
TemperatureVSEase of manufacture

Solution Approach 1:

The patent merges the metal plate and plastic base body into a single integrated temperature control element through embedding. The metal plate is positioned within cavities of the plastic base body, and connection components are integrated directly into the structure. This merging eliminates the need for separate soldering operations between metal tubes and plates, simplifying the manufacturing process while maintaining thermal conductivity.

Inventive Principle:
Principle #5Merging (Combining)

4Reliability

If plastic cooling plates are used, then electrical insulation is improved, but minimum layer thickness increases

Engineering Contradiction:
Improveelectrical insulationVSAvoidlayer thickness
Core Design Contradiction:
ReliabilityVSLength of moving object

Solution Approach 1:

By using a composite structure with a metal plate embedded in plastic, the required plastic layer thickness for electrical insulation is reduced. The metal plate provides the thermal conductivity function, allowing the plastic base body to be thinner while still achieving adequate electrical insulation, thus reducing the overall layer thickness compared to pure plastic cooling plates.

Inventive Principle:
Principle #40Composite materials

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

The solution provides reliable temperature control, maintaining battery efficiency and extending service life by enabling both cooling and heating within the required temperature range, while ensuring adequate electrical insulation and mechanical strength.

Implementation Method 1

a flat metal plate (7) which is arranged on the thermally conductive surface (3)... at least one continuous channel (13) for receiving a temperature control medium in direct contact with the metal plate (7)

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a base body (11) made of plastic, which essentially is arranged on the side of the thermally insulating surface (5)... the base body (11) contains the metal plate (7)

Methodology Applied
Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentEP2976801B1Temperature control element
Publication Date: 2017.01.11 BASF SE
  • EP2976801B1 patent drawing
  • EP2976801B1 patent drawing
  • EP2976801B1 patent drawing

AI summary

The invention provides a temperature control element (1), which has a thermally conductive surface (3) and a thermally insulating surface (5) and comprises a metallic plate (7) having raised portions (9), a plastic base body (11) and two plastic connection components (17a, 17b). At least one continuous channel (13) for receiving a temperature control medium is formed between the metallic plate (7) and the base body (11), said channel extending from an end face (15a) to an opposite end face (15b) of the base body (11) and being connected to a temperature control medium circuit by the connection components (17a, 17b). The temperature control element (1) is formed in such a manner that the base body (11) at least partially surrounds the metallic plate (7). The invention further relates to a method for producing a temperature control element, a use of the temperature control element (1) in a lithium ion battery (101) and a lithium ion battery (101) comprising the temperature control element (1).