Battery Assembly DCDC Control for Short-Circuit Load Isolation
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Solution Overview
Problem
Battery assemblies and energy storage systems often break down due to load short-circuiting and power failures, leading to uncontrollable discharge currents and potential safety hazards.
Innovation Solution
A battery assembly with a control unit that manages a DCDC converter to output a current greater than the maximum nominal discharge current but less than the short-circuit protection current, allowing for controlled disconnection of short-circuited loads and maintaining busbar voltage, along with a monitoring unit to manage power failure by powering off secondary loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery assembly outputs maximum nominal discharge current, then the power supply capability is improved, but the system reliability deteriorates when a load is short-circuited
Solution Approach 1:
The patent implements dynamic current control through the DCDC converter, which adjusts the discharge current in real-time based on system conditions. When a short-circuit is detected, the converter dynamically limits the current to a safe level while maintaining normal high-current operation during legitimate power demands, thus resolving the contradiction between power supply capability and system reliability
Solution Approach 2:
The control unit continuously monitors system parameters including current and voltage levels, providing feedback to the DCDC converter. This feedback mechanism enables the system to detect short-circuit conditions and automatically adjust the discharge current accordingly, ensuring both high power capability during normal operation and system reliability during fault conditions
2Power
If the battery assembly outputs high discharge current during power failure, then the power backup capability is improved, but the discharge duration deteriorates due to rapid energy depletion
Solution Approach 1:
The DCDC converter dynamically adjusts the discharge current profile during power failure scenarios. It provides high current initially to ensure immediate power backup capability, then automatically reduces the current level to extend the discharge duration, optimizing the balance between power output and energy conservation
Solution Approach 2:
The control unit implements periodic monitoring of the battery state and adjusts the discharge strategy in stages. It transitions from high-power mode to extended-duration mode based on real-time battery status, ensuring both immediate power backup and sustained operation
3Object-affected harmful factors
If the battery assembly limits the discharge current during short-circuit, then the system safety is improved, but the power output deteriorates
Solution Approach 1:
The DCDC converter acts as an intermediary between the battery assembly and the load. It receives high-power capability from the battery and conditionally delivers appropriate current levels to the load, mediating between the need for high power output and the requirement for safety during short-circuit conditions through intelligent current management
Data Source
Figure 1
Figure 2A~2B
Figure 3~4A
AI summary
This application provides a battery assembly and an energy storage system. The battery assembly includes a control unit and a DCDC converter. The control unit is configured to: when a first load is short-circuited in a process in which the battery assembly supplies power to the first load, control the DCDC converter to output a first current. The first current is greater than a maximum nominal discharge current of the battery assembly, is used to break an electrical connection between the first load and a busbar, and is less than a short-circuit protection current of the battery assembly; and/or the control unit is configured to: after a power supply encounters a power failure, control a discharge capability of the battery assembly to be greater than a maximum nominal discharge capability of the battery assembly, and supply power to a first load and a second load by using a DCDC converter; and after the first load is powered off, control the discharge capability of the battery assembly to be restored to the maximum nominal discharge capability, and supply power to the second load by using the DCDC converter. In this way, breakdown of the energy storage system including the battery assembly is avoided.