Battery Pack Connection State Detection via Precharge Link Voltage
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Solution Overview
Problem
Existing battery management systems face challenges in determining the connection state of battery packs without additional components, particularly in distinguishing between serial and parallel connections.
Innovation Solution
A battery management apparatus and method that includes a measuring unit to assess link voltage and a determining unit to control a switching circuit, allowing identification of connection states based on threshold values and switching circuit driving states, without requiring separate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate additional component is used to identify connection state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The precharge circuit is designed to serve dual purposes: its primary function of charging the capacitor and a secondary function of enabling connection state identification through link voltage measurement. By making the existing circuit multi-functional, no additional components are required while maintaining accurate connection state detection capability
Solution Approach 2:
The system uses its own existing resources (precharge circuit and link voltage measurement capability) to identify the connection state, rather than relying on external or separate dedicated components. The battery management apparatus leverages its inherent circuitry to perform the identification function
2Adaptability or versatility
If battery packs allow both serial and parallel connection, then adaptability is improved, but control complexity increases
Solution Approach 1:
The system performs preliminary identification of the connection state (serial or parallel) before executing the appropriate control scheme. By determining the connection configuration in advance through link voltage measurement, the system can then apply the correct control strategy, simplifying the overall control process despite supporting multiple connection types
Solution Approach 2:
The control scheme dynamically adapts based on the identified connection state. The system transitions from a static control approach to a dynamic one where the control parameters and strategies change according to whether serial or parallel connection is detected, enabling efficient management of both configurations
Data Source
AI summary
A battery management apparatus includes a measuring unit configured to measure a link voltage of each of a plurality of battery packs and a determining unit configured to control a switching circuit provided in each of the plurality of battery packs and determine a connection state of the plurality of battery packs based on a link voltage of the plurality of battery packs corresponding to a driving state of the switching circuit.