Battery Control System Low-Temperature Current Restriction
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Solution Overview
Problem
Existing battery control systems fail to impose optimal charge/discharge restrictions in low-temperature states, leading to degraded battery performance due to inadequate management of temperature-related current limitations.
Innovation Solution
A battery control system that includes a current detection unit, voltage detection unit, temperature detection unit, and an assembled battery control unit, which calculates effective current values and imposes two-phase charge/discharge restrictions based on temperature history and threshold values to manage battery performance in low-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If charge/discharge restriction is imposed to prevent battery temperature increase, then battery temperature control is improved, but charge/discharge current restriction in low-temperature state cannot be imposed optimally
Solution Approach 1:
The patent segments the temperature management into two distinct modes: high-temperature restriction mode and low-temperature restriction mode. Each mode has its own control strategy and threshold values, allowing optimal charge/discharge current restriction for each temperature condition without compromising the other
Solution Approach 2:
The patent dynamically adjusts charge/discharge current restrictions based on real-time temperature conditions. The control unit switches between different restriction strategies depending on whether the battery is in a high-temperature or low-temperature state, enabling adaptive optimization of charge/discharge operations across varying temperature conditions
2Reliability
If charge/discharge current is restricted in low-temperature state, then battery performance degradation is prevented, but battery output capability is reduced
Solution Approach 1:
The patent changes the control parameters (threshold values and restriction levels) based on temperature conditions. In low-temperature state, specific threshold values are applied to prevent performance degradation, while in high-temperature state, different threshold values allow higher output capability, thus optimizing both reliability and power across temperature ranges
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 system effectively restricts charge/discharge currents in low-temperature states, preventing performance degradation by dynamically adjusting power limits based on temperature thresholds, thereby ensuring optimal battery operation.
Implementation Method 1
a temperature detection unit that detects a temperature at the assembled battery
Implementation Method 2
a current detection unit that measures a current value by detecting an electric current flowing through the assembled battery
Implementation Method 3
Heat is generated at a secondary battery such as a lithium-ion battery as it is charged or discharged
Implementation Method 4
Heat is generated at a secondary battery such as a lithium-ion battery as it is charged or discharged
Data Source
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AI summary
A battery control system connected to a battery, which controls charge/discharge at the battery, includes: a current detection unit that measures a current value by detecting a charge/discharge current flowing through the battery; a voltage detection unit that detects a voltage at the battery; a temperature detection unit that detects a temperature at the battery; a temperature history recording unit that records temperature history pertaining to the temperature detected by the temperature detection unit; and a charge/discharge restriction unit that restricts the charge/discharge current in a low-temperature state based upon the temperature history recorded by the temperature history recording unit.