Battery Tab Spring Constant Layout for Current Breaker Protection
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Solution Overview
Problem
Existing electrical storage devices face challenges in preventing excessive loads on functional components, such as current breaking mechanisms, during manufacturing, which can lead to performance deterioration and damage due to vibrations or impacts.
Innovation Solution
The electrical storage device incorporates a design where the spring constants of the positive electrode tab group and the negative electrode tab group are set such that the positive electrode tab group has a higher spring constant than the negative electrode tab group, ensuring that the functional component is protected from excessive loads by preferentially deforming the negative electrode tab group to absorb forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the functional component (current breaking mechanism) is provided in the electrical storage device, then the safety and reliability are improved, but the functional component is susceptible to performance deterioration and damage due to vibration or impact during manufacturing
Solution Approach 1:
The patent applies beforehand cushioning by designing the negative electrode tab group with lower spring constant than the positive electrode tab group. This creates a protective mechanism that absorbs vibration and impact loads during manufacturing before they can reach the functional component (current breaking mechanism), thereby protecting it from performance deterioration and damage
Solution Approach 2:
The patent uses the negative electrode tab group as an intermediary element between the external environment (vibration/impact) and the functional component (current breaking mechanism). The tab group acts as a mediator that preferentially deforms under load, shielding the functional component from harmful mechanical stresses during assembly
2Reliability
If strict manufacturing conditions are regulated to prevent load on the functional component, then the functional component is protected from damage, but the productivity decreases
Solution Approach 1:
The patent implements self-service by designing the battery structure itself to protect the functional component through the spring constant difference between positive and negative electrode tab groups. This eliminates the need for special manufacturing conditions or additional protective measures, allowing normal manufacturing processes to proceed without compromising functional component safety
Solution Approach 2:
The structural design provides beforehand cushioning that automatically protects the functional component during standard manufacturing operations. This eliminates the need for strict manufacturing regulations or special handling procedures, thereby maintaining high productivity while ensuring functional component protection
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 design effectively prevents great loads from being applied to the current breaking device, thereby protecting it from vibrations and impacts, and ensures good productivity without the need for special manufacturing conditions.
Implementation Method 1
the spring constants of the positive electrode tab group and the negative electrode tab group are set such that the positive electrode tab group has a higher spring constant than the negative electrode tab group, ensuring that the functional component is protected from excessive loads by preferentially deforming the negative electrode tab group to absorb forces
Data Source
Figure 1~2
Figure 3
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AI summary
This electrical storage device comprises: an electrode body made by positive electrodes and negative electrodes being alternately laminated with separators interposed therebetween; a bottomed cylindrical outer can; a sealing plate to which a positive electrode terminal and a negative electrode terminal are attached, and that closes the opening part of the outer can; and a functional part placed near the positive electrode terminal or the negative electrode terminal on the inner surface of the sealing plate. The electrode body has a positive electrode tab group for which a plurality of positive electrode tabs are laminated, and a negative electrode tab group for which a plurality of negative electrode tabs are laminated, and each tab group functions as a spring that connects the electrode body and the sealing plate. Of the positive electrode tab group and the negative electrode tab group, the spring constant of one tab group near the functional part is greater than the spring constant of the other tab group.