Lead-Acid Battery Electrolyte Circulation for Faster Formation Cooling
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Solution Overview
Problem
Lead acid batteries face challenges during the forming process due to excessive heat generation, which can cause swelling, pressure buildup, mechanical distortion, and potential explosion, necessitating improved temperature control and quicker cell formation.
Innovation Solution
A battery assembly with a jar body and cover featuring ports and valve assemblies for controlled electrolyte circulation, allowing for efficient temperature management through electrolyte flow patterns, including evacuation and replacement, to regulate internal temperature and expedite the formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional box formation process is used to form lead acid batteries, then the battery formation is completed with proper chemical reactions, but the process takes several hours to several days and generates excessive heat causing swelling, pressure buildup, and potential explosion
Solution Approach 1:
The patent changes the temperature parameter of the electrolyte by introducing chilled electrolyte at controlled temperatures (e.g., 0-40°C, preferably 10-30°C) to replace the warm electrolyte generated during formation. This parameter change allows faster formation rates without exceeding safe temperature thresholds, reducing formation time from days to hours while maintaining battery safety
Solution Approach 2:
The patent implements continuous electrolyte circulation and replacement through multiple ports (first port for inlet, second port for outlet) to maintain continuous heat removal during the formation process. This continuous action prevents heat accumulation and allows sustained higher formation currents, significantly reducing formation time while preventing thermal runaway
2Productivity
If higher charging currents are applied during formation to reduce formation time, then the formation process is accelerated, but excessive heat is generated causing active chemicals to expand, pressure to build up, and components to distort
Solution Approach 1:
The patent uses chilled electrolyte as an intermediary cooling medium that absorbs excess heat generated during high-rate formation. The electrolyte circulates through the battery cells, absorbing heat from the active chemicals and plates, and is continuously replaced with fresh chilled electrolyte to maintain effective heat removal, enabling high formation rates without temperature-induced damage
Solution Approach 2:
The patent employs hydraulic principles by using fluid (chilled electrolyte) flow through the battery cells to remove heat. Multiple ports are configured to create flow patterns that ensure thorough cooling of all battery components, allowing high current formation while maintaining safe operating temperatures through controlled electrolyte circulation
3Temperature
If chilled electrolyte is used to control temperature during formation, then the interior temperature is reduced to prevent damage, but the specific gravity of sulfuric acid must be continuously monitored and adjusted
Solution Approach 1:
The patent segments the temperature control function into multiple independent ports (first inlet port, second outlet port, third inlet port, fourth outlet port) distributed across the battery assembly. Each port handles specific flow paths, allowing localized temperature control and simpler monitoring at each port rather than requiring complex centralized control systems
Solution Approach 2:
The continuous electrolyte circulation system automatically maintains temperature control through the flow dynamics and heat exchange properties of the electrolyte itself. The system self-regulates temperature by continuously replacing warm electrolyte with chilled electrolyte, reducing the need for complex external temperature control mechanisms while maintaining effective cooling
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
The solution effectively controls temperature during battery formation, reducing the risk of mechanical distortion and explosion while significantly shortening the formation time, thereby enhancing battery quality and safety.
Implementation Method 1
The battery assembly provides for circulation of an electrolyte composition... The electrolyte composition is evacuated from the interior cavity through the first port or the second port and is replaced with additional electrolyte composition through the other port to create an electrolyte composition flow pattern
Implementation Method 2
chilled electrolyte composition may be used for the step of filling to result in an overall lower interior temperature of the battery assembly after the exothermic reactions occur
Implementation Method 3
Lead acid batteries function via a chemical reaction between lead and sulfuric acid. During the discharge process, the lead and lead oxide plates in the battery react with the sulfuric acid electrolyte to produce lead sulfate and water
Implementation Method 4
Excess heat may also occur as a result of power dissipation as current flows through the interior resistance of the battery during charging or discharging (also known as Joule heating)
Data Source
AI summary
A battery assembly for circulation of an electrolyte composition comprises a jar body having an upper and a lower end and a floor at the lower end, one or more sidewalls presenting an interior and an exterior surface, and a jar cover. The jar body defines an interior cavity disposed about a vertical axis. The battery assembly comprises two or more ports including a first port and a second port. The battery assembly also comprises one or more valve assemblies. The electrolyte composition is evacuated from the interior cavity through the first port or the second port and is replaced with additional electrolyte composition through the other port to create an electrolyte composition flow pattern within the interior cavity between the lower end and the upper end of the battery assembly.