Sealed Battery Valve Pressure Management
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Solution Overview
Problem
Sealed batteries face a reduction in safety mechanism working pressure and weld strength due to long-term use, leading to a short durable period, as existing safety mechanisms like current-interrupting and explosion-proof valves are overloaded and their effectiveness is compromised.
Innovation Solution
A sealed battery structure with a valve that transitions between closed, open, and closed states based on internal pressure, using a coil spring and reverse plate mechanism to manage pressure, ensuring the safety mechanism operates effectively by optimizing gas emission and preventing excessive pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety mechanism (current-interrupting valve or explosion-proof valve) is provided to prevent battery explosion when internal pressure rises, then battery safety is improved, but the working pressure of the safety mechanism and weld strength are reduced due to long-term use, shortening the durable period
Solution Approach 1:
The pressure relief function is segmented into two distinct mechanisms: a first pressure relief mechanism (valve with coil spring and reverse plate) that operates at normal pressure levels, and a second pressure relief mechanism (explosion-proof valve or current-interrupting valve) that operates at excessive pressure levels. This segmentation prevents the safety mechanism from bearing continuous load, thereby maintaining its working pressure and weld strength over the long term while ensuring battery safety.
2Reliability
If gas is generated in the battery through charging/discharging or use in high-temperature environments, then battery internal pressure increases, but the safety mechanism is overloaded even if it does not operate, reducing working pressure and weld strength
Solution Approach 1:
The first pressure relief mechanism acts as an intermediary that handles normal gas generation pressure, preventing this intermediate pressure level from being transmitted to the safety mechanism. The valve body with its coil spring and reverse plate structure provides a intermediate pressure management layer that protects the safety mechanism from continuous loading, thereby preserving both working pressure and weld strength.
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 extends the battery's durable period by maintaining optimal internal pressure and reducing the load on safety mechanisms, ensuring reliable operation and preventing premature degradation.
Implementation Method 1
a coil spring (52) serving as an elastic member that is housed in the cap (51)
Implementation Method 2
when the internal pressure is more than or equal to the first pressure and less than a second pressure, and into the closed state when the internal pressure is more than or equal to the second pressure
Implementation Method 3
into the closed state when the internal pressure is more than or equal to the second pressure
Data Source
AI summary
A sealed battery with a battery element housed in a sealed casing. The sealed battery includes a valve brought into a closed state when a pressure of a gas in the casing is less than a first pressure P1, into an open state when the pressure is more than or equal to the first pressure P1 and less than a second pressure P2, and into the closed state when the pressure is more than or equal to the second pressure P2, and a safety mechanism configured to, when the internal pressure reaches a third pressure P3 exceeding the second pressure P2, operate in accordance with the third pressure P3.