Battery Module Heater Control Using dQ/dV Temperature Detection
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Solution Overview
Problem
Existing power storage modules with multiple batteries face challenges in temperature control, particularly when batteries have varying temperatures, leading to potential degradation and increased lithium deposition risks, and the use of individual temperature sensors for each battery increases costs.
Innovation Solution
A power storage module design that utilizes voltage and current sensors to determine the battery with the lowest temperature, controlling a heater based on differential voltage and temperature readings without requiring a temperature sensor for each battery, thereby reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is provided for each battery to enable precise temperature control, then temperature control reliability is improved, but manufacturing cost increases
Solution Approach 1:
The battery module uses its own voltage sensors and current sensors to detect temperature differences through voltage changes during charging, eliminating the need for separate temperature sensors. The system serves itself by utilizing existing components for dual purposes (voltage sensing and temperature detection), thereby reducing cost while maintaining control reliability
Solution Approach 2:
The voltage sensors and current sensors originally designed for electrical parameter monitoring are made to serve an additional function of temperature detection. By analyzing voltage changes during charging that correlate with temperature, the same sensors perform multiple functions, reducing the total component count and manufacturing cost
2Reliability
If a heater is operated based on the lowest temperature battery to prevent degradation and lithium deposition, then battery safety is improved, but device complexity increases due to the need for individual battery temperature monitoring
Solution Approach 1:
The control circuit identifies the lowest temperature battery by analyzing voltage changes during charging using existing voltage and current sensors, without requiring a separate temperature sensing system. The system uses its own operational data to determine which battery needs heating, simplifying the control architecture while ensuring safety
Solution Approach 2:
The system detects temperature differences by monitoring voltage changes during charging, transforming temperature information into electrical parameter variations. This allows the control system to identify the lowest temperature battery through voltage sensor data rather than direct temperature measurement, reducing system complexity
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
Achieves effective temperature control across multiple batteries by using existing sensors, maintaining optimal battery temperatures and reducing manufacturing costs by minimizing the need for individual temperature sensors.
Implementation Method 1
a first voltage sensor that senses a voltage of the first battery, a second voltage sensor that senses a voltage of the second battery
Implementation Method 2
a current sensor that senses a current flowing through the first battery and the second battery
Implementation Method 3
the heater is turned on by a signal from the IC in the case where a differential voltage between a first peak voltage of dQ/dV calculated from a detection value of each of the first voltage sensor and the current sensor and a second peak voltage of dQ/dV calculated from a detection value of each of the second voltage sensor and the current sensor is higher than or equal to 5 mV
Data Source
AI summary
A power storage module which includes a plurality of batteries connected in series and is capable of controlling operation of a heater on the basis of a battery with the lowest battery temperature is provided. The power storage module includes a first battery and a second battery connected in series, the heater, and a control circuit; the heater is provided close to the first battery and the second battery and is electrically connected to an IC included in the control circuit; the control circuit includes a first voltage sensor that senses a voltage of the first battery, a second voltage sensor that senses a voltage of the second battery, and a current sensor that senses a current flowing through the first battery and the second battery; and in charging the first battery and the second battery, the heater is turned on by a signal from the IC in the case where a differential voltage between a first peak voltage of dQ/dV calculated from a detection value of each of the first voltage sensor and the current sensor and a second peak voltage of dQ/dV calculated from a detection value of each of the second voltage sensor and the current sensor is higher than or equal to 5 mV.