Multi-Assembly Secondary Battery Layout for Heat and Welding Resistance
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Solution Overview
Problem
Existing secondary batteries face challenges with high welding resistance and limited heat dissipation when multiple electrode assemblies are installed in a single case, which restricts cell capacity and safety.
Innovation Solution
The secondary battery design includes a plurality of electrode assemblies with non-coating portions for the positive and negative electrodes, connected to separate terminals, allowing for improved heat dissipation and reduced welding resistance by using a stack-type structure with alternating electrode plates and terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple electrode assemblies are installed in one case to increase cell capacity, then energy density is improved, but welding resistance increases and heat dissipation becomes limited
Solution Approach 1:
The invention divides the battery system into multiple electrode assemblies (first electrode assembly and second electrode assembly) with separate terminals. Each assembly has its own negative electrode terminal and positive electrode terminal, allowing independent electrical connections. This segmentation reduces the welding resistance by distributing the welding joints across multiple separate connections rather than requiring extensive welding for a single large assembly, while still achieving high cell capacity through the combined energy of multiple assemblies.
2Quantity of substance
If multiple electrode assemblies are installed in one case to increase cell capacity, then energy density is improved, but heat dissipation becomes limited
Solution Approach 1:
By dividing the battery into multiple electrode assemblies with separate terminals and independent mounting positions, the invention creates multiple heat dissipation pathways. Each assembly can dissipate heat independently through its own terminals and surrounding structure, preventing heat accumulation that would occur in a single large assembly. The case structure with multiple mounting locations facilitates distributed heat distribution across the battery pack.
Solution Approach 2:
The invention arranges electrode assemblies in a stacked configuration (first assembly in first position, second assembly in second position) utilizing vertical or spatial dimensionality. This multi-dimensional arrangement increases the surface area available for heat dissipation and allows heat to escape through multiple directions, improving thermal management compared to a single-planar configuration.
3Reliability
If separate terminals are used for each electrode assembly to reduce welding resistance, then device complexity increases
Solution Approach 1:
The case structure serves multiple functions: it provides mechanical support for the electrode assemblies, acts as a thermal management pathway for heat dissipation, and serves as the mounting structure for the terminals. The first case and second case both provide these functions, allowing the terminal structure to be integrated with the case rather than requiring separate complex mounting mechanisms, thus reducing overall device complexity while maintaining multiple terminals.
Data Source
AI summary
A secondary battery is provided that reduces welding resistance between an electrode tab and a terminal and quickly and easily dissipates heat if a plurality of electrode assembles are installed in one case. The secondary battery includes a plurality of electrode assemblies including a negative electrode plate provided with a negative electrode non-coating portion and a positive electrode plate provided with a positive electrode non-coating portion, a case accommodating the electrode assembly, a cap plate covering an open inlet of the case, a negative electrode terminal installed on the cap plate for each of the electrode assemblies and electrically connected to the negative electrode non-coating portion, and a positive electrode terminal installed in the case in an opposite direction of the negative electrode terminal and electrically connected to the positive electrode non-coating portion.