Battery Electrolyte Injection Mass from Pore and Consumption Volumes

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Solution Overview

Problem

Existing methods for determining the optimal injection mass of electrolyte for lithium-ion batteries are inefficient and time-consuming, requiring lengthy experimental cycles and resulting in high research and development costs.

Innovation Solution

A method that calculates the injection mass of electrolyte by determining the total volume of pores in the battery's electrodes and separator, the volume of electrolyte required by the negative electrode active material layer, the volume consumed in the formation process, and the volume consumed in the injection process, thereby optimizing the electrolyte injection process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If experimental methods are used to determine optimal electrolyte injection mass by injecting different amounts into batteries and performing performance tests, then the accuracy of determining injection mass can be improved, but the experiment cycle becomes long (3 to 6 months), efficiency decreases, and battery preparation materials are consumed leading to high research and development costs

Engineering Contradiction:

Improveaccuracy of determining injection massVSAvoidexperiment cycle

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-calculating the electrolyte injection mass using a formula that considers pore volumes of electrodes and separator, swelling percentages, and formation consumption coefficients before actual battery assembly. This eliminates the need for lengthy experimental cycles (3-6 months) while maintaining accuracy, as the injection mass is determined through theoretical calculation rather than trial-and-error experimentation.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If experimental methods are used to determine optimal electrolyte injection mass by injecting different amounts into batteries and performing performance tests, then the accuracy of determining injection mass can be improved, but research and development costs increase due to consumption of battery preparation materials

Engineering Contradiction:

Improveaccuracy of determining injection massVSAvoidbattery preparation materials consumption

Core Design Contradiction:

Measurement precisionVSLoss of substance

Solution Approach 1:

The patent applies self-service by using a self-contained calculation system that determines electrolyte injection mass through intrinsic battery parameters (porosity, volume, swelling coefficients) without requiring external experimental validation. This eliminates material consumption associated with preparing multiple test batteries with different electrolyte amounts, as the optimal injection mass is derived from the battery's own structural characteristics.

Inventive Principle:

Principle #25Self-service

3Measurement precision

Engineering Contradiction:

Improveaccuracy of determining injection massVSAvoidefficiency of determining injection mass

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces the mechanical/experimental system of injecting electrolyte into physical batteries and performing performance tests with a computational system. The injection mass is calculated using a formula based on battery structural parameters (porosity, volume, swelling coefficients), substituting lengthy experimental procedures with rapid mathematical computation, thereby dramatically improving efficiency while maintaining accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12326390B2Method for determining battery electrolyte injection mass based on electrode swelling, formation consumption, and injection consumption

Publication Date: 2025.06.10 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

A method for determining injection mass of electrolyte for a battery includes: determining a total volume V1 of pores in a positive electrode active material layer, a negative electrode active material layer, and a separator of the battery; determining a volume V2 of electrolyte required by the negative electrode active material layer to ensure battery cycles; determining a volume V3 of electrolyte consumed by the battery in a formation process; determining a volume V4 of electrolyte consumed by the battery in an injection process; and determining the injection mass of electrolyte for the battery: MEl=(V1+V2+V3+V4)×ρEl. The injection mass of electrolyte for the battery is closer to actual optimal injection mass, which improves the accuracy of the electrolyte injection process, provides better electrochemical performance of the battery, and lowers the research and development costs of the battery.