Battery Cell Protective Member for Thermal Runaway Venting
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Solution Overview
Problem
Existing battery technologies face issues with thermal runaway diffusion between adjacent battery cells due to heat conduction and gas spewing from pressure relief mechanisms, which can lead to serious thermal runaway and damage to sampling members.
Innovation Solution
A battery design featuring a protective member fixed to a sampling member, positioned between adjacent battery cells opposite the pressure relief mechanism, with a degassing space to insulate heat and guide gas discharge, minimizing thermal runaway impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressure relief mechanism is disposed between two adjacent battery cells, then the sampling member can be positioned for signal collection, but heat generated by thermal runaway can be conducted to the opposite battery cell causing serious thermal runaway
Solution Approach 1:
A protective member is introduced as an intermediary element between the pressure relief mechanism and the sampling member. This protective member blocks the direct path of heat conduction and gas flow from the pressure relief mechanism to the sampling member and adjacent battery cells, thereby preventing thermal runaway propagation while maintaining the sampling function.
Solution Approach 2:
The protective member is pre-positioned between the pressure relief mechanism and the sampling member to provide beforehand protection. When thermal runaway occurs, this pre-positioned protective structure immediately blocks heat and gas flow, preventing the harmful effects from reaching the sampling member and adjacent cells before damage can occur.
2Object-generated harmful factors
If the pressure relief mechanism is disposed between two adjacent battery cells, then gas can be vented, but high-temperature gas can damage the sampling member
Solution Approach 1:
The protective member serves as a mediator that allows gas venting functionality to be maintained while protecting the sampling member from high-temperature gas. The protective member is positioned to block the direct path of hot gas flow to the sampling member, thereby preserving the reliability of the sampling component.
Solution Approach 2:
The protective member converts the harmful high-temperature gas flow into a beneficial protective barrier. By positioning the protective member between the pressure relief mechanism and the sampling member, the system uses the gas flow path to validate the protective function while preventing actual damage to the sampling member.
3Device complexity
If no protective structure is added, then the device complexity is low, but thermal runaway can spread to adjacent battery cells
Solution Approach 1:
The protective member is designed as a segmented structure with a base portion and a protrusion, creating distinct functional zones. The base portion provides general protection while the protrusion specifically blocks gas flow paths, achieving effective thermal runaway prevention through segmented structural design.
Solution Approach 2:
The protective member exhibits local quality by having different structural features in different regions. The base portion provides broad protective coverage while the protrusion provides focused protection against gas flow, allowing the structure to address multiple protection needs with a single integrated component.
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 protective member effectively insulates and prevents thermal runaway, ensuring safe operation by blocking heat conduction and guiding gas discharge, thus enhancing safety and preventing adjacent cell damage.
Implementation Method 1
heat generated by one battery cell in thermal runaway can be further conducted to the other battery cell disposed opposite the battery cell
Implementation Method 2
the degassing space formed between the protective member and the pressure relief mechanism can make gas guiding and discharging easy
Data Source
AI summary
Embodiments of this application provide a battery, an electric apparatus, and a method and an apparatus for preparing a battery. The battery includes a plurality of battery cells arranged in a first direction and electrically connected to each other. At least one of two adjacent battery cells has a pressure relief mechanism. The pressure relief mechanism is disposed at an end of the battery cell in the first direction. The battery further includes a sampling member connected to the battery cells and configured to perform signal collection on the battery cells, and a protective member disposed between the two adjacent battery cells and disposed opposite the pressure relief mechanism. There is a degassing space between the protective member and the pressure relief mechanism, and the protective member is fixed to the sampling member.