Battery Self-Heating via Alternating Charge Discharge Control
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Solution Overview
Problem
Existing charge and discharge control devices for secondary batteries are ineffective in sufficiently raising the temperature of batteries in low-temperature environments, leading to reduced charge capacity and inefficient self-heating processes.
Innovation Solution
A charge and discharge control device that alternately performs charging and discharging between two storage batteries with temperatures below a threshold, using a control unit to manage the process and ensure equal charge and discharge power amounts, and incorporating a temperature adjustment circuit to enhance heat transfer and maintain optimal battery temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electric power is shifted in one direction from dischargeable battery to chargeable battery, then charge and discharge control is simplified, but temperature rise of battery is insufficient
Solution Approach 1:
The patent implements periodic alternation between charging and discharging operations for the first and second batteries. The control unit switches the charging/discharging target between the two batteries at predetermined intervals, creating a periodic action pattern that accumulates thermal effects while maintaining simplified control logic.
Solution Approach 2:
The system dynamically switches the role of each battery between charging and discharging states based on predetermined time intervals. This dynamic reconfiguration allows the system to adapt the thermal generation pattern while maintaining a relatively simple control structure compared to multi-battery optimization systems.
2Ease of manufacture
If self-heating is used to maintain battery temperature, then external heating equipment is eliminated, but temperature rise is not sufficient for low-temperature environments
Solution Approach 1:
The control unit implements periodic switching between charging the first battery and discharging it, then charging the second battery and discharging it. This periodic action creates repeated thermal cycles that accumulate heat more effectively than single-direction charging, achieving sufficient temperature rise without external heating equipment.
Solution Approach 2:
The system maintains continuous useful action by ensuring that while one battery is being charged, the other is discharging, and vice versa. This continuous alternation ensures that thermal generation is ongoing without interruption, maintaining battery temperature effectively in low-temperature environments.
3Temperature
If charging and discharging are performed repeatedly between two batteries, then temperature rise is sufficient, but state of charge changes require compensation
Solution Approach 1:
The control unit monitors the state of charge of both batteries and uses feedback control to manage the charging/discharging cycles. When the state of charge difference exceeds predetermined thresholds, the control unit adjusts the switching timing or intensity to compensate, ensuring that the overall system maintains charge balance while achieving sufficient temperature rise.
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 approach effectively increases the self-heating value of storage batteries, ensuring sufficient temperature rise without altering the state of charge, thus maximizing charge/discharge capacity and preventing unnecessary temperature increases.
Implementation Method 1
a heat-retentive current which can be used to maintain the temperature flows between the heat-retentive batteries during charging and discharging, so that the heat-retentive batteries can be warmed with self-heating
Data Source
AI summary
A charge and discharge control device includes a control unit which controls charging and discharging of a plurality of storage batteries capable of exchanging electric power via an external electrical grid; and an acquisition unit which acquires a temperature of each of the storage batteries. When there are at least two storage batteries having a temperature equal to or lower than a threshold value among the plurality of storage batteries, the control unit controls the two storage batteries to repeatedly perform charging and discharging in turn between the two storage batteries.