Battery Protection Circuit Temperature Control
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Solution Overview
Problem
Conventional battery packs lack effective control mechanisms for safe and efficient charging/discharging operations in both high and low temperature regions, leading to inefficiencies and safety risks, particularly at low temperatures where battery capacity decreases significantly and the risk of damage increases.
Innovation Solution
Incorporating a temperature sensor to measure the battery temperature and control the charge/discharge element, preventing abnormal operations such as overheating, and including a protection circuit with a temperature fuse and sensor resistance to manage charging/discharging processes across varying temperature ranges, ensuring safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a lithium secondary battery is charged to 4.5V or more, then the battery capacity increases, but the electrolyte is dissolved and gas is generated causing safety issues
Solution Approach 1:
The protection circuit performs preliminary detection of charging voltage and current before dangerous conditions occur. When the charging voltage approaches 4.5V or abnormal current is detected, the protection circuit preemptively interrupts the charging process through the charge element, preventing electrolyte dissolution and gas generation while allowing the battery to reach near-full capacity.
Solution Approach 2:
The protection circuit continuously monitors charging voltage, current, and temperature through sensor resistance and provides real-time feedback. Based on this feedback, the control circuit dynamically adjusts the charging process and triggers the charge element to interrupt charging when parameters approach dangerous thresholds, resolving the contradiction between maximizing capacity and preventing harmful effects.
2Power
If the battery operates in high temperature region, then the battery can deliver higher power, but the risk of catching fire, bursting or explosion increases
Solution Approach 1:
The temperature sensor continuously monitors battery temperature and provides feedback to the control circuit. When the temperature exceeds a predetermined safe threshold, the protection circuit automatically interrupts the charging or discharging operation through the charge/discharge element, preventing thermal runaway and catastrophic failures while allowing the battery to operate at high power within safe temperature ranges.
Solution Approach 2:
The protection circuit establishes predetermined safe temperature thresholds in advance. Before the battery reaches dangerous high-temperature conditions, the protection circuit preemptively interrupts operation when the temperature approaches these thresholds, preventing fire and explosion risks while maximizing power delivery within safe operating limits.
3Ease of operation
If the battery operates in low temperature region, then the battery can maintain operation, but the capacity decreases significantly and the risk of damage increases
Solution Approach 1:
The temperature sensor detects low temperature conditions and provides feedback to the control circuit. When the temperature falls below a predetermined threshold, the protection circuit interrupts the charging or discharging operation through the charge/discharge element, preventing battery damage. This allows the battery to operate reliably across a wide temperature range while protecting capacity by preventing operation in excessively cold conditions where capacity would be significantly reduced.
4Reliability
If a protection circuit module is added to prevent over-charging, over-discharging or over-current, then the safety and reliability improve, but the device complexity increases
Solution Approach 1:
The protection circuit integrates multiple safety functions (over-charging protection, over-discharging protection, over-current protection, and temperature protection) into a single unified module. The charge element, discharge element, control circuit, and temperature sensor work together as an integrated system, reducing overall device complexity compared to having separate protection circuits for each function while maintaining high reliability through comprehensive safety monitoring.
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
The solution effectively prevents battery damage and ensures safe operation in high temperature regions while maintaining efficient charging and discharging at low temperatures, enhancing overall battery capacity and safety by controlling charge/discharge processes based on real-time temperature feedback.
Implementation Method 1
a temperature sensor for measuring a temperature of the battery
Implementation Method 2
a charge element and a discharge element connected to each other in an alternate fashion in a high current path between the battery and the external terminal
Implementation Method 3
A sensor resistance senses the occurrence of over-charging or over-discharging and over-current and transmits sensing information to the primary and secondary protection circuits
Data Source
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AI summary
A protection circuit controls charging/discharging of a battery pack in both a high temperature region and a low temperature region. The battery pack is protected from the risk of firing, burning or explosion which occurs in a high temperature region, to secure its safety. Furthermore, the charging and discharging of the battery pack is controlled in a low temperature region, to prevent incomplete charging and to increase the battery capacity efficiency.