Dynamic Battery Cooling Thresholds for EV Range
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Solution Overview
Problem
Existing battery cooling systems in electric vehicles increase power consumption when cooling is activated, leading to reduced traveling distance due to inefficient temperature management, as they struggle to balance battery protection and extended range.
Innovation Solution
A battery cooling control device that dynamically adjusts cooling start and stop temperatures based on the vehicle's mode of operation (EV or HEV) and charging state, optimizing cooling only when necessary to minimize power consumption and prevent battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling device is activated to cool the battery, then the battery temperature is reduced and battery deterioration is suppressed, but power consumption increases and EV traveling distance decreases
Solution Approach 1:
The patent dynamically adjusts the cooling start temperature threshold based on the vehicle's operating mode (EV mode vs. HEV mode). In EV mode where power consumption critically affects traveling distance, the cooling start temperature is set higher to delay cooling activation. In HEV mode where the engine provides power, the cooling start temperature is set lower to allow earlier cooling. This parameter adaptation resolves the contradiction by optimizing the trade-off between battery protection and power consumption according to the power source being used.
Solution Approach 2:
The cooling control system transitions from a static fixed-temperature threshold to a dynamic adaptive threshold that changes based on operating conditions. The electronic control unit continuously monitors the vehicle mode and adjusts the cooling start temperature accordingly, making the system flexible and context-aware to balance battery durability and power consumption in real-time.
2Reliability
If the cooling start temperature is set low to ensure battery protection, then battery deterioration is suppressed, but cooling activates too early increasing power consumption and reducing EV traveling distance
Solution Approach 1:
The patent implements mode-dependent temperature thresholds: a higher cooling start temperature in EV mode to extend traveling distance, and a lower cooling start temperature in HEV mode to prioritize battery protection. This parameter differentiation allows the system to accept higher battery temperatures temporarily in EV mode when power consumption must be minimized, while providing more aggressive cooling in HEV mode where power is abundant.
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 effectively prolongs the electric vehicle's traveling distance by optimizing cooling strategies, reducing power consumption, and preventing battery deterioration while maintaining efficient electricity usage.
Implementation Method 1
a cooling system configured to start cooling the power storage device in response to a receiving of the cooling start instruction and stop cooling the power storage device in response to a receiving of the cooling stop instruction
Data Source
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AI summary
A battery control device capable of compatibly attaining suppressing deterioration of a battery and increasing an EV traveling distance in an electrically driven vehicle having an engine and a motor is provided. The battery cooling control device has an ECU 11 which can change over a traveling mode of a vehicle 1 between an EV traveling mode where the vehicle 1 travels while operating a motor generator 12 and an HEV traveling mode where the vehicle 1 travels while operating the motor generator 12 and an engine 14. In addition, based on a detection result of a BMU 16, the ECU 11 outputs a cooling start instruction when the temperature of the battery 14 reaches a predetermined cooling start temperature, and a cooling stop instruction when the temperature of the battery 14 reaches a predetermined cooling stop temperature. The ECU 11 changes the value of the cooling start temperature and the value of the cooling stop temperature between the EV traveling mode and the HEV traveling mode.