Battery Cell Shell Cavity for Accurate Temperature Sensing
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Solution Overview
Problem
The uncontrollable temperature rise in battery cells due to short circuits or local high temperatures leads to thermal runaway, posing risks of combustion or explosion, and existing temperature monitoring systems lack accuracy and stability, failing to timely respond to abnormal temperature changes.
Innovation Solution
A battery cell design with a shell having a first chamber for the electrode assembly and a second chamber housing temperature sampling members closer to the electrode assembly, allowing for more accurate temperature monitoring and reducing the risk of sampling member detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sampling member is placed closer to the electrode assembly to improve temperature detection accuracy, then the measurement precision is improved, but the risk of the sampling member being damaged or detached due to direct collision with external objects increases
Solution Approach 1:
The temperature sampling member is nested within a cavity formed inside the shell wall, which is itself nested within the battery cell structure. This nested arrangement allows the sampling member to be positioned close to the electrode assembly for accurate temperature detection while being protected by the cavity wall from external collisions and detachment risks.
2Loss of time
If the temperature sampling member is positioned close to the electrode assembly to detect abnormal temperature rise timely, then the response time is improved, but the probability of thermal runaway increases due to potential direct exposure to high temperature and short circuit risks
Solution Approach 1:
The cavity formed inside the shell wall acts as an intermediary structure between the temperature sampling member and the electrode assembly. This intermediary allows the sampling member to detect temperature changes timely by being positioned close to the electrode assembly, while simultaneously providing physical isolation that protects the sampling member from direct exposure to high temperature and short circuit risks.
3Measurement precision
If a cavity is formed inside the shell wall to house the temperature sampling member, then the measurement precision and reliability are improved, but the device complexity increases due to additional structural elements
Solution Approach 1:
The cavity formed inside the shell wall serves multiple functions simultaneously: it houses the temperature sampling member for accurate temperature detection, provides mechanical protection against external collisions, and acts as a thermal barrier isolating the sampling member from high temperature and short circuit risks. By integrating these multiple functions into a single structural element, the design improves measurement precision and reliability without proportionally increasing device complexity.
Data Source
AI summary
The present application relates to a battery cell, a battery, and an electric apparatus. The battery cell comprises a housing, an electrode assembly, and a temperature acquisition member. The housing comprises a plurality of walls that define a first chamber, and at least one wall has a second chamber formed therein. The electrode assembly is accommodated in the first chamber. The temperature acquisition member is accommodated in the second chamber. By arranging the temperature acquisition member in the second chamber, the temperature acquired by the temperature acquisition member is more approximate to the actual temperature of the electrode assembly, thereby instantly reflecting the temperature rise of the electrode assembly and reducing the probability of thermal runaway of the battery cell.