Battery Pack Signal Transmission for High-Voltage Cell Balancing
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Solution Overview
Problem
Existing secondary battery packs face limitations in withstanding voltage and power consumption when multiple batteries are connected in series, requiring high voltage-withstanding components or insulation methods that increase costs and energy loss.
Innovation Solution
The secondary battery pack employs a transmission system with constant current transmission and OR functions, allowing information to be transmitted without voltage limitations and reducing power consumption by using a cascade connection of control ICs with level conversion and high-resistance circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in series to increase voltage, then the voltage output is improved, but the withstanding voltage requirement and power consumption increase
Solution Approach 1:
The battery pack is divided into multiple unit blocks, each with its own battery adjustment section. These unit blocks are connected in series to achieve high voltage output, while each unit block operates independently with its own control circuitry, avoiding the need for a single high voltage-withstanding control system.
Solution Approach 2:
A transmission section is introduced as an intermediary between unit blocks to transmit information signals. This transmission section enables communication across unit blocks without requiring high voltage-withstanding capabilities in the signal transmission path, as it handles only low-voltage control signals.
2Reliability
If insulation measures are implemented to handle high voltage, then the safety is improved, but the power consumption and cost increase
Solution Approach 1:
By segmenting the battery pack into unit blocks with independent control sections, each operating at lower voltages, the need for high voltage insulation is eliminated. This segmentation allows standard low-voltage components to be used, reducing power consumption and cost.
Solution Approach 2:
Each unit block has its own battery adjustment section that monitors and controls its local batteries. This distributed control approach copies the control functionality across multiple low-voltage units rather than using a single high-voltage control system, reducing insulation requirements.
3Power
If high voltage-withstanding components are used, then the voltage handling capability is improved, but the cost and device complexity increase
Solution Approach 1:
The control system is segmented into multiple battery adjustment sections, each handling a small number of batteries at low voltage. This avoids the need for high voltage-withstanding components in the control circuitry, simplifying the overall device complexity while maintaining high voltage handling capability through series connection of unit blocks.
Solution Approach 2:
The transmission section acts as an intermediary that enables communication between unit blocks without requiring high voltage-withstanding components. It transmits control and status signals between distributed battery adjustment sections, maintaining system coordination while using only low-voltage components.
Data Source
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AI summary
A secondary battery pack of the present invention includes a secondary battery block 3 in which a plurality of unit blocks 2 are connected in series; battery adjustment sections 5 that are each provided for each of the unit blocks 2 and have a function of monitoring the voltage of secondary batteries and a function of adjusting the balance; a charge switch 8; and a discharge switch 9. The secondary battery pack includes transmission sections 17 that receive information from the corresponding battery adjustment sections 5. The transmission sections are connected to the preceding or subsequent transmission sections and are so set that at least either information input from the preceding transmission sections or information input from the battery adjustment sections 5 is output to the subsequent transmission sections. The transmission sections are equipped with a constant current transmission section that transmits with a constant value of current; and a current detection section that can detect the value of the constant current.