Cell Voltage Gating Module With Protected Switch Control
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Solution Overview
Problem
Existing battery management systems face challenges in accurately controlling gating circuits and reliably measuring the voltage of each battery in a battery pack, leading to potential errors in charging and discharging processes.
Innovation Solution
A detection and gating module is introduced, comprising N gating switches, protection circuits, and voltage generation circuits, which detect battery voltages by turning on and off the switches using control voltages generated by voltage generation circuits, ensuring precise voltage measurement and control across each battery in a series-connected battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gating circuit is used to select and measure battery voltage, then voltage measurement capability is achieved, but control accuracy and measurement reliability are insufficient
Solution Approach 1:
The patent divides the battery pack into N individual battery units, each with its own dedicated gating switch (first gating switch and second gating switch), protection circuit, and voltage generation circuit. This segmentation allows independent control and measurement of each battery's voltage, improving both measurement accuracy and reliability by isolating measurement errors to individual units rather than affecting the entire system.
Solution Approach 2:
The patent introduces protection circuits as intermediary elements between the gating switches and the voltage measurement system. These protection circuits prevent voltage spikes and electrical interference from affecting the measurement accuracy, thereby improving both measurement precision and reliability by mediating the interaction between the gating circuit and the measurement system.
2Ease of operation
If gating switches are used to control battery selection, then voltage measurement of individual batteries is enabled, but control accuracy of the gating circuit is insufficient
Solution Approach 1:
The patent implements separate gating switches for different battery selection scenarios: a first gating switch for normal operation and a second gating switch for abnormal conditions. This segmentation enables precise control over which battery is being measured based on system state, improving gating control accuracy while maintaining ease of operation through automated switch selection.
Solution Approach 2:
The patent uses voltage generation circuits to pre-charge or pre-discharge capacitors before gating switch activation, ensuring that the gating switches transition smoothly and accurately. This preliminary action prevents voltage spikes and ensures precise gating control, thereby improving manufacturing precision in the gating control mechanism.
3Measurement precision
If voltage measurement system is added to detect each battery voltage, then voltage detection capability is achieved, but device complexity increases
Solution Approach 1:
The patent designs the detection module components, particularly the voltage generation circuits and protection circuits, to serve multiple functions. The voltage generation circuits not only provide gate control voltages but also protect against voltage spikes. The protection circuits serve both to protect the gating switches and to ensure measurement accuracy. This multi-functionality reduces overall device complexity while maintaining individual battery voltage detection capability.
Solution Approach 2:
The patent combines the protection function and the voltage generation function into integrated circuits that work together with the gating switches. By merging these functions into a coordinated system rather than separate independent components, the overall device complexity is reduced while achieving both accurate voltage detection and reliable protection.
4Reliability
If protection circuits are added to protect gating switches, then reliability of gating switch is improved, but device complexity increases
Solution Approach 1:
The patent merges the protection circuit functionality with the voltage generation circuit functionality. The same circuitry that generates the gate control voltages also provides protection against voltage spikes and electrical interference. This merging reduces device complexity by eliminating redundant protection components while maintaining reliable gating switch protection.
Solution Approach 2:
The protection circuits are designed to serve multiple purposes: protecting the gating switches from voltage spikes, ensuring accurate voltage measurement, and working in conjunction with the voltage generation circuits. This multi-functionality justifies the added complexity by providing multiple benefits from a single circuit design.
Data Source
AI summary
A detection and gating module in a battery management system is provided, where the detection and gating module is configured to detect a voltage of each battery in a battery pack containing N batteries connected in series, N≥1, and the detection and gating module includes: N gating switches, where an ith gating switch of the N gating switches is connected to a positive terminal of an ith battery of the N batteries, a voltage of the ith battery is detected when the ith gating switch is turned on, and 1≤i≤N; N protection circuits, where an ith protection circuit of the N protection circuits is configured to protect the ith gating switch of the N gating switches; and N voltage generation circuits.