Battery Cell Management Chip for Individual State Monitoring

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional battery management systems (BMS) primarily monitor battery modules rather than individual battery cells, leading to errors in state of charge estimation and inability to adjust operating states based on individual cell usage, thereby affecting battery efficiency and lifespan.

Innovation Solution

A battery cell management chip connected to a single battery cell, featuring a processing circuit, acquisition circuit, power supply, dynamic protection circuit, and storage circuit, which acquires and processes parameters like stress, voltage, current, and temperature to adjust the operating state and determine the state of charge of the battery cell.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If battery management system monitors battery modules instead of individual battery cells, then device complexity is reduced, but measurement precision of state of charge deteriorates

Engineering Contradiction:

Improvemonitoring system complexityVSAvoidstate of charge estimation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides the battery system into individually monitored battery cells, with each cell having its own management chip. This segmentation allows precise monitoring of each cell's state of charge, voltage, current, and temperature independently, resolving the contradiction by maintaining low system complexity through modular design while achieving high measurement precision at the cell level.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If battery management system monitors individual battery cells, then measurement precision of state of charge improves, but device complexity increases

Engineering Contradiction:

Improvestate of charge estimation accuracyVSAvoidmonitoring system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Each battery cell is equipped with an independent management chip that autonomously monitors its own parameters (voltage, current, temperature, stress) and makes protection decisions. This self-service approach eliminates the need for complex centralized monitoring infrastructure, achieving high measurement precision without proportionally increasing system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces dynamic protection thresholds that change based on the battery cell's state of charge and operating conditions. By adjusting protection parameters dynamically rather than using fixed thresholds, the system achieves precise control at the cell level while maintaining manageable complexity through adaptive rather than static management.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If dynamic protection threshold is updated according to state of charge, then adaptability of battery protection improves, but loss of time for threshold updates increases

Engineering Contradiction:

Improveprotection threshold adaptabilityVSAvoidthreshold update time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The management chip updates protection thresholds periodically based on state of charge measurements and operating conditions. This periodic update mechanism balances adaptability with time efficiency, adjusting thresholds at appropriate intervals rather than continuously, thereby maintaining protection effectiveness while minimizing time loss.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system implements feedback loops where the management chip continuously monitors battery cell parameters and automatically adjusts protection thresholds based on real-time state of charge and operating conditions. This feedback mechanism ensures high adaptability while optimizing update timing to minimize time loss through intelligent decision-making rather than frequent updates.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4534339A1Battery cell management chip, and battery system and vehicle

Publication Date: 2025.04.09 BYD CO LTD

Figure 1~2
Figure 3~5

AI summary

A vehicle (3000), having a battery system (2000), and the battery system (2000) having a battery cell management chip (10), wherein the chip (10) comprises a collection circuit (102), a power source (103), a processing circuit (101), and a dynamic protection circuit (106); the collection circuit (102) is used for collecting a parameter value of a working parameter of a single battery cell (2001) and transmitting the parameter value to the processing circuit (101); the power source (103) supplies power to the processing circuit (101); a storage circuit (105) is used for storing a dynamic protection threshold value for the working parameter; the processing circuit (101) is used for adjusting the working state of the single battery cell (2001) in the case of an anomaly; and the dynamic protection circuit (106) is used for adjusting the working state of the single battery cell (2001) according to the dynamic protection threshold value.