Battery Cell Case Bonding With Expansion Gap for Thermal Safety
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring safety and improving energy density due to the use of bonding members that coat the entire surface of the battery cell, which increases weight and reduces expansion space, potentially leading to thermal runaway.
Innovation Solution
A battery design that incorporates a first bonding member to connect the battery cell and a case assembly with a first gap to accommodate expansion, reducing the need for full surface coating and reserving space for expansion, thereby enhancing safety and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bonding member coats the entire surface of the battery cell, then the structural strength is improved, but the expansion space is reduced and weight increases
Solution Approach 1:
The bonding member is segmented into a first bonding member and a second bonding member, with the first bonding member having a smaller area than the entire first surface of the battery cell. This segmentation allows the bonding member to provide structural strength while leaving gaps that serve as expansion spaces for the battery cell during charging and discharging cycles.
Solution Approach 2:
The first bonding member is positioned to bond only specific regions of the battery cell to the case assembly, rather than coating the entire surface. This local bonding approach provides sufficient structural support while preserving expansion space in unbonded regions, resolving the contradiction between strength and expansion volume.
2Strength
If a bonding member coats the entire surface of the battery cell, then the structural strength is improved, but the energy density is reduced
Solution Approach 1:
The bonding member is divided into first and second bonding members with the first having a smaller area than the entire first surface. This reduces the total amount of bonding material used, decreasing weight and increasing the volume available for active materials, thereby improving energy density while maintaining structural strength through strategic placement.
Solution Approach 2:
Instead of coating the entire first surface with bonding material, only a portion (the first bonding member) is applied. This partial action provides sufficient structural strength for safety while reducing the quantity of non-active material, thus improving energy density.
3Stability of the object's composition
If the battery cell expands without sufficient space, then the structural integrity is maintained, but thermal runaway occurs
Solution Approach 1:
The patent incorporates a first gap between the battery cell and the case assembly before any expansion occurs. This pre-designed gap serves as a cushioning space that accommodates the battery cell's expansion during charging and discharging, preventing structural damage and avoiding thermal runaway while maintaining structural integrity through the second bonding member.
Solution Approach 2:
The bonding configuration is segmented into first and second bonding members, where the first provides localized bonding and the second provides additional structural support. This segmentation allows the battery cell to expand into the gap without compromising overall structural integrity, preventing thermal runaway while maintaining stability.
Data Source
AI summary
Various embodiments provide a battery and a method for manufacturing the battery, an apparatus of manufacturing the battery and an electricity-consuming device. In some embodiments, the battery includes a battery cell; a case assembly configured to accommodate the battery cell and including a first portion, in which the first portion is arranged at least one side of the battery cell in a first direction; and a first bonding member, in which at least part of the first bonding member is filled between the first portion and the battery cell and bonds the first portion and the battery cell. A first gap is formed between the first portion and the battery cell, and the first gap is configured to release an expansion stress when the battery cell expands. The solutions provided by the embodiments of the present disclosure can improve the energy density and safety of the battery, and prolong the service life of the battery.