Battery Pack Temperature Biasing for Charge and Discharge Cutoff
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Solution Overview
Problem
Existing battery packs cannot adjust charging or discharging operations based on the specific temperature range requirements of different rechargeable batteries, leading to potential overheating or underheating issues that affect battery health.
Innovation Solution
A battery pack design incorporating a temperature signal generation circuit with a biasing circuit and control circuit that adjusts the voltage of the temperature signal based on battery status, allowing the external device to reduce or stop charging/discharging when the battery temperature deviates from an appropriate range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery pack merely outputs a temperature signal to the external device, then the device complexity is reduced, but the battery pack cannot make the external device stop charging or discharging when the battery temperature deviates from the appropriate range
Solution Approach 1:
The patent introduces a biasing circuit as an intermediary component between the temperature detection device and the external device. This biasing circuit modifies the temperature signal voltage based on battery status (charging/discharging states), enabling the battery pack to control the external device's charging/discharging operations without requiring complex communication protocols. The biasing circuit acts as a mediator that translates battery status into appropriate voltage levels that the external device can interpret to adjust its operation.
2Device complexity
If the upper limit and lower limit of battery temperature are fixed in the external device, then the device complexity is reduced, but the limits cannot be adjusted for different types of rechargeable batteries
Solution Approach 1:
The patent implements dynamic temperature signal modification by the biasing circuit based on real-time battery status. Instead of fixed temperature limits in the external device, the system dynamically adjusts the temperature signal voltage depending on whether the battery is charging or discharging. This allows the same external device to work with different battery types and conditions by simply changing the biasing voltage applied to the temperature signal, making the system adaptable without modifying the external device's internal limits.
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 solution enables the battery pack to effectively manage charging and discharging operations according to the specific temperature requirements of various batteries, enhancing battery health and longevity by preventing extreme temperature conditions.
Implementation Method 1
The temperature detection device has a variable resistance that is dependent on a battery temperature in the battery pack
Implementation Method 2
The biasing circuit is configured to bias the voltage of the temperature signal. The voltage biased makes the external device reduce or stop charging and/or discharging
Data Source
AI summary
One aspect of the present disclosure provides a battery pack including a rechargeable battery, a first power supply terminal, a second power supply terminal, a first signal terminal, a second signal terminal, a positive-side current path, a negative-side current path, a temperature signal generation circuit, a biasing circuit, and a control circuit. The temperature signal generation circuit (i) includes a temperature detection device and (ii) generates a temperature signal across the first signal terminal and the second signal terminal. The temperature detection device has a variable resistance that is dependent on a battery temperature. The temperature signal has a voltage associated with the variable resistance. The biasing circuit biases the voltage of the temperature signal. The voltage biased makes an external device reduce or stop (i) charging from the external device to the rechargeable battery and/or (ii) discharging from the rechargeable battery to the external device.