Battery Pack Over-Discharge Detection Using Model-Specific Voltage Thresholds
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Solution Overview
Problem
Conventional battery packs lack effective methods to determine over-discharge conditions, leading to potential overheating, safety valve activation, and electrolyte leakage, as users cannot distinguish over-discharged batteries from healthy ones, resulting in improper charging.
Innovation Solution
A charging circuit and device that utilize a memory-stored lower limit voltage specific to each battery model, along with voltage and current measurement units, to determine over-discharge conditions by comparing the inter-terminal voltage with the model-specific lower limit voltage, preventing charging when the battery is over-discharged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charging circuits limit overcharging by voltage thresholds, then overcharging is prevented, but over-discharged battery packs cannot be distinguished from healthy ones, leading to improper charging
Solution Approach 1:
The patent applies preliminary action by detecting the battery's lower limit voltage (over-discharge condition) before charging begins. The control unit checks if the battery voltage is below a predetermined threshold and prohibits charging in advance, preventing the harmful effects of charging an over-discharged battery rather than reacting after damage occurs.
Solution Approach 2:
The patent implements feedback by continuously monitoring the battery's inter-terminal voltage and comparing it against both upper limit (overcharge) and lower limit (over-discharge) thresholds. This dual-threshold feedback system provides real-time information about battery state, enabling the control unit to make informed decisions about charging prohibition based on actual battery conditions.
2Ease of operation
If users charge battery packs without over-discharge detection, then charging operations are simple, but overheating and safety valve activation occur due to improper charging of over-discharged batteries
Solution Approach 1:
The patent applies self-service by enabling the battery pack itself to provide information about its state (through voltage detection) and by equipping the charging device with automatic protection capabilities. The system serves itself by automatically detecting over-discharge conditions and prohibiting charging without requiring user judgment or intervention, thus protecting against overheating while maintaining operational simplicity.
Solution Approach 2:
The patent uses voltage detection as an intermediary between the battery's chemical state and the charging control decision. The detection unit measures inter-terminal voltage as an intermediate parameter that reflects the battery's charge state, translating complex electrochemical conditions into a simple electrical measurement that the control unit can use to make safe charging decisions.
3Device complexity
If the battery pack lacks over-discharge determination capability, then the device structure remains simple, but correct identification of over-discharged battery packs is impossible
Solution Approach 1:
The patent applies universality by using the existing voltage detection functionality of the charging device for multiple purposes: both overcharge detection (upper voltage threshold) and over-discharge detection (lower voltage threshold). This multi-functional approach enables accurate identification of over-discharged battery packs without adding separate dedicated detection hardware, thus maintaining structural simplicity while improving measurement precision.
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
Correctly identifies over-discharged battery packs, preventing further charging and reducing the risk of overheating and safety valve activation, ensuring safe and efficient battery usage.
Implementation Method 1
a voltage measurement unit that measures an inter-terminal voltage of the battery block
Implementation Method 2
a control unit that prohibits charging of the battery pack when the inter-terminal voltage is determined to be equal to or less than the lower limit voltage
Data Source
AI summary
A battery pack (1a) includes a battery block (10) and a memory (14a). The battery block (10) includes a battery cell (11), and the memory (14a) stores battery information. The battery information includes a battery block lower limit voltage (VLb) set in accordance with the model of the battery block (10).