Lithium-Ion Battery Separator With Switchable Electrolyte Injection
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Solution Overview
Problem
Existing lithium-ion battery designs face challenges in efficiently injecting electrolyte into multiple cavities while maintaining isolation and preventing decomposition due to high potential differences between battery sets, leading to reduced battery performance and safety concerns.
Innovation Solution
A lithium-ion battery design featuring a separator with a liquid injection hole and a block mechanism that allows electrolyte injection between adjacent cavities during filling and subsequently closes to isolate them, ensuring each cavity receives the electrolyte effectively and preventing electrolyte flow between cavities, which helps in avoiding decomposition and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator separates internal space into multiple cavities to prevent electrolyte decomposition, then battery safety is improved, but electrolyte injection becomes complex and difficult
Solution Approach 1:
The separator is divided into multiple independent cavities that are separated from each other. Each cavity can be independently filled with electrolyte through separate injection holes, allowing controlled injection while maintaining isolation between cavities to prevent decomposition.
Solution Approach 2:
The separator acts as an intermediary structure between adjacent battery sets. It provides both isolation to prevent harmful electrolyte interaction and controlled pathways (injection holes) for electrolyte introduction, mediating between the need for safety and the need for manufacturability.
2Quantity of substance
If multiple single batteries are arranged side by side to increase capacity, then overall capacity is improved, but installation structures and external power connectors increase cost and weight
Solution Approach 1:
Multiple battery sets are merged into a single integrated battery structure with a unified housing and shared separator system. The separator internally divides the space into cavities for individual battery sets, eliminating the need for separate installation structures and external power connectors while maintaining high capacity.
Solution Approach 2:
The battery sets are nested within a single housing structure, with each set contained in its own cavity formed by the separator. This nested arrangement allows multiple battery sets to coexist in a compact configuration without requiring separate external connectors or mounting structures for each individual battery.
3Device complexity
If adjacent pole sets share a common electrolyte cavity to reduce structures, then device complexity is reduced, but electrolyte decomposition occurs due to high potential difference
Solution Approach 1:
The common electrolyte cavity is segmented into multiple isolated sub-cavities by the separator structure. Each cavity accommodates a pole set and contains its own electrolyte volume, preventing direct contact between electrolytes of adjacent pole sets with different potentials while still allowing a unified housing design.
Solution Approach 2:
The separator serves as an intermediary barrier between adjacent pole sets. It physically isolates the electrolyte volumes while allowing the overall battery to function as an integrated unit, mediating between the desire for structural simplicity and the requirement for electrochemical stability.
Data Source
AI summary
The present invention provides a lithium-ion battery, including: a housing and a separator located inside the housing, where the separator separates internal space of the housing into a plurality of accommodation cavities, battery core sets are disposed inside the accommodation cavities, the battery core sets each include at least one pole shank, and the battery core sets are connected in series; and at least one separator is provided with a liquid injection hole, and the liquid injection hole is used to connect two adjacent accommodation cavities on two sides of the separator; and a block mechanism, where the block mechanism is located inside the housing, the block mechanism enables the liquid injection hole to be in a predetermined state, and the predetermined state includes an open state and a closed state. The battery provided in the present invention ensures isolation and safety of each battery core set while facilitating liquid injection.