Battery Cell Internal Temperature Sensing Inside the Seal
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Solution Overview
Problem
Existing battery designs, such as those described in Patent Literature 1, face challenges in precisely measuring the internal temperature of power storage cells, especially when the coating area of active material layers increases, leading to temperature differences between the end and center portions, making it difficult to accurately gauge internal temperatures.
Innovation Solution
A power storage device with temperature sensors arranged inside the sealing portion of the power storage cells, allowing for precise measurement of internal temperatures by embedding sensors within the positive electrode active material layer or between current collectors, and using flexible printed circuits to transmit measurements externally without impairing sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection element is arranged outside the sealing material, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision of internal temperature is deteriorated
Solution Approach 1:
The temperature detection element is nested within the sealing material structure, specifically arranged in the extension portion of the current collector that is surrounded by the sealing material. This nesting approach allows the sensor to be positioned inside the sealed environment without requiring separate external mounting structures, thereby achieving precise internal temperature measurement while maintaining manufacturing simplicity.
Solution Approach 2:
The sealing material itself serves as an intermediary medium that facilitates the placement of the temperature detection element. By arranging the sensor in the extension portion of the current collector within the sealing material, the sealing material acts as a mediator that enables both thermal contact for accurate measurement and structural integration, eliminating the need for complex external sensor mounting arrangements.
2Quantity of substance
If the coating area of active material layer increases, then the energy storage capacity is improved, but the temperature difference between end and center portions increases making internal temperature measurement more difficult
Solution Approach 1:
The temperature detection element is strategically positioned in the extension portion of the current collector, which is a specific local region within the sealing material. This localized placement ensures that the sensor is positioned optimally to measure the internal temperature of the power storage cell, particularly effective for cells with large coating areas where temperature gradients are significant. The sensor captures the thermal state of the active material region without being affected by external environmental factors.
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 precise internal temperature measurement of power storage cells, even when positioned centrally, and maintains the performance and sealing integrity of the battery, reducing the risk of damage from temperature sensors.
Implementation Method 1
the temperature sensor is arranged inside from the sealing portion of the power storage cell to be measured when seen from the stacking direction... it is possible to precisely measure the internal temperature when used by the temperature sensor
Data Source
AI summary
A power storage device includes power storage cells that are stacked in a stacking direction, and a temperature sensor configured to measure a temperature of at least one power storage cell to be measured among the power storage cells. Each of the power storage cells includes a positive electrode that includes a first current collector, and a positive electrode active material layer, a negative electrode that includes a second current collector, and a negative electrode active material layer, a separator that is arranged between the positive electrode and the negative electrode, and a sealing portion—that surrounds and seals the positive electrode active material layer and the negative electrode active material layer. The temperature sensor is arranged inside from the sealing portion of the power storage cell to be measured