Battery Pack Temperature Estimation for Cell Layer Charge Control
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Solution Overview
Problem
Existing battery pack temperature measurement methods provide rough and incomplete data, affecting the performance and safety of power tools due to inadequate comprehensiveness and accuracy.
Innovation Solution
A battery pack system that includes a monitoring device to measure ambient temperature at multiple points, allowing a controller to determine cell layer temperatures based on ambient temperature, material, structural, electrical parameters, and heat transfer coefficients, enabling precise control of charging and discharging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature is measured only at the battery pack housing, then the measurement structure is simple, but the temperature measurement data is rough and inaccurate
Solution Approach 1:
The battery pack is divided into multiple temperature measurement zones (housing, cell group, individual cells) with sensors placed at each segment. This segmentation allows comprehensive temperature monitoring throughout the battery pack structure, transforming a single rough measurement point into multiple precise measurement points that collectively provide accurate temperature data for safety control.
Solution Approach 2:
The patent introduces temperature sensors as intermediary detection devices between the battery components and the control system. These sensors act as mediators that convert physical temperature parameters into electrical signals that can be processed by the control unit, enabling precise temperature monitoring without direct contact with all battery components.
2Loss of information
If multiple temperature sensors are installed throughout the battery pack, then temperature measurement comprehensiveness is improved, but the device complexity and cost increase
Solution Approach 1:
The monitoring system is segmented into hierarchical levels: housing temperature sensors, cell group temperature sensors, and individual cell temperature sensors. This segmentation allows the system to capture temperature information at different levels of detail, ensuring comprehensive coverage while organizing the complexity into manageable modules that can be independently configured and maintained.
Solution Approach 2:
The control unit serves multiple functions: it processes data from all temperature sensors, determines abnormal temperature conditions, controls charging/discharging processes, and manages overall battery safety. This multi-functionality consolidates what would otherwise be separate systems into a single integrated unit, reducing overall system complexity while maintaining comprehensive monitoring capabilities.
3Reliability
If real-time temperature monitoring and control is implemented, then battery safety is improved, but the control system complexity increases
Solution Approach 1:
The system implements continuous feedback loops where temperature sensors monitor battery temperature in real-time, the control unit processes this information, and the charging/discharging process is automatically adjusted based on temperature conditions. This feedback mechanism ensures safety by continuously comparing actual temperature against safe operating limits and immediately responding to prevent overheating, while the automated nature of the feedback reduces the need for complex manual control systems.
Solution Approach 2:
The battery management system performs self-monitoring and self-regulation of temperature conditions during charging and discharging. The control unit automatically adjusts charging parameters or stops charging when abnormal temperatures are detected, without requiring external intervention. This self-service capability enhances safety while simplifying the overall control architecture by eliminating the need for external monitoring and manual control systems.
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 approach provides more accurate and comprehensive temperature measurement data, allowing for precise control of battery pack operations, enhancing both the efficiency and safety of power tools by preventing overheating and optimizing energy management.
Implementation Method 1
a monitoring device configured to monitor an ambient temperature at one temperature measurement point or an ambient temperature at each of multiple temperature measurement points in the battery pack housing
Implementation Method 2
the controller is further configured to determine a cell layer temperature of a target cell layer among the multiple cell layers based on at least one ambient temperature and control, based on the cell layer temperature of the target cell layer
Data Source
AI summary
A battery pack includes: a battery pack housing; a cell group including multiple cells and accommodated in the battery pack housing; and a monitoring device configured to monitor an ambient temperature at one temperature measurement point or an ambient temperature at each of multiple temperature measurement points in the battery pack housing. A cell includes multiple cell layers, the battery pack further includes a controller configured to control a charging process of the battery pack or a discharging process of the battery pack, the monitoring device is further configured to transmit the monitored ambient temperature to the controller, and the controller is further configured to determine a cell layer temperature of a target cell layer among the multiple cell layers based on at least one ambient temperature and control, based on the cell layer temperature of the target cell layer, the battery pack to be charged or discharge electricity.