Battery Gas Discharging and Electrolyte Injection Mechanism
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in discharging generated gas and injecting electrolyte due to their sealed vacuum state, which prevents gas discharge and electrolyte injection, especially in pouch-shaped batteries.
Innovation Solution
A battery design incorporating a gas discharging member with a pipe and suction pump, and a liquid electrolyte injection member with a check valve to allow controlled gas discharge and electrolyte injection, using a liquid material non-transmissive porous film and a check valve to prevent backward flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell is sealed in a vacuum state to minimize contact with external air, then reliability is improved, but gas discharge and electrolyte injection become impossible
Solution Approach 1:
The sealed portion is divided into multiple through holes, with different holes serving different functions: some for gas discharge only, others for electrolyte injection, and some for both functions. This segmentation allows the sealed structure to maintain vacuum protection while enabling selective gas and electrolyte management.
Solution Approach 2:
A suction pump is introduced as an intermediary device to create negative pressure for gas discharge, and a check valve serves as an intermediary to control electrolyte flow direction. These intermediary components enable gas discharge and electrolyte injection functions without compromising the vacuum seal integrity.
2Reliability
If the battery cell is sealed in a vacuum state to minimize contact with external air, then reliability is improved, but electrolyte injection becomes impossible
Solution Approach 1:
The sealed portion is divided into multiple through holes, with different holes serving different functions: some for gas discharge only, others for electrolyte injection, and some for both functions. This segmentation allows the sealed structure to maintain vacuum protection while enabling selective gas and electrolyte management.
Solution Approach 2:
A check valve is introduced as an intermediary device to control electrolyte flow direction, allowing electrolyte to enter the cell during injection but preventing it from leaking out during normal operation. This enables electrolyte injection functionality while maintaining the vacuum seal.
3Reliability
If a porous film is used to prevent electrolyte from exiting through the gas discharging member, then reliability is improved, but gas discharge efficiency may be reduced
Solution Approach 1:
The sealed portion is divided into multiple through holes, with different holes serving different functions: some for gas discharge only (without porous films), others for electrolyte injection, and some for both functions (with porous films). This segmentation allows gas discharge efficiency to be optimized in dedicated gas holes while electrolyte containment is ensured in holes requiring dual functionality.
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
Enables efficient discharge of generated gas and injection of electrolyte into lithium secondary batteries, ensuring optimal performance and longevity by managing gas and electrolyte within the battery.
Implementation Method 1
a gas discharging member (200) communicating with the internal space of the battery case for discharging gas generated in the cell out of the cell
Implementation Method 2
a backward flow prevention member mounted at the other end of the pipe member... the backward flow prevention member is a check valve for preventing the liquid electrolyte from flowing backward from the cell to the liquid electrolyte storage tank
Implementation Method 3
the gas discharging member comprises a liquid material non-transmissive porous film mounted at one end of the pipe member
Data Source
Figure 1
AI summary
Disclosed herein is a battery including a cell having an electrode laminate and a liquid electrolyte mounted in an internal space of a battery case, a gas discharging member communicating with the internal space of the battery case for discharging gas generated in the cell out of the cell, and a liquid electrolyte injection member communicating with the internal space of the battery case for injecting a liquid electrolyte into internal space of the battery case.