Battery State Estimation via Dynamic Target Segmentation

Solution Overview

Problem

Estimating the battery state of a large battery module with multiple secondary batteries accurately while minimizing power consumption and heat generation is challenging due to variations in battery characteristics, leading to increased calculation loads.

Innovation Solution

A battery state estimating device that dynamically adjusts the number of targets for estimation and calculation formulas based on specific values such as temperature differences or SOC differences, reducing the calculation load and power consumption while maintaining accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If calculations are performed for each secondary battery to account for battery characteristic variations, then measurement precision of battery state is improved, but use of energy by stationary object increases due to large calculation load

Engineering Contradiction:

Improvebattery state estimation accuracyVSAvoidpower consumption of computing section

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The patent segments the battery module into multiple groups based on temperature characteristics. Instead of processing all secondary batteries individually, the system divides them into groups (e.g., first group with lower temperature, second group with higher temperature) and performs calculations only on representative batteries from each group. This segmentation reduces the number of calculations while maintaining estimation accuracy through group-based representative values.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing calculations only on a subset of secondary batteries rather than all batteries. Specifically, it calculates battery states for representative batteries from each temperature group and uses these results to estimate the states of other batteries in the same group, thereby performing fewer calculations while achieving sufficient accuracy.

Inventive Principle:

Principle #16Partial or excessive action

2Measurement precision

If calculations are performed for each secondary battery to account for battery characteristic variations, then measurement precision of battery state is improved, but productivity decreases due to large calculation load

Engineering Contradiction:

Improvebattery state estimation accuracyVSAvoidcalculation speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent segments the battery module into multiple groups based on temperature characteristics. Instead of processing all secondary batteries individually, the system divides them into groups (e.g., first group with lower temperature, second group with higher temperature) and performs calculations only on representative batteries from each group. This segmentation reduces the number of calculations while maintaining estimation accuracy through group-based representative values.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing calculations only on a subset of secondary batteries rather than all batteries. Specifically, it calculates battery states for representative batteries from each temperature group and uses these results to estimate the states of other batteries in the same group, thereby performing fewer calculations while achieving sufficient accuracy.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If calculations are performed for each secondary battery to account for battery characteristic variations, then measurement precision of battery state is improved, but object-generated harmful factors increase due to heat generation in computing section

Engineering Contradiction:

Improvebattery state estimation accuracyVSAvoidheat generation in computing section

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent segments the battery module into multiple groups based on temperature characteristics. Instead of processing all secondary batteries individually, the system divides them into groups (e.g., first group with lower temperature, second group with higher temperature) and performs calculations only on representative batteries from each group. This segmentation reduces the number of calculations while maintaining estimation accuracy through group-based representative values.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing calculations only on a subset of secondary batteries rather than all batteries. Specifically, it calculates battery states for representative batteries from each temperature group and uses these results to estimate the states of other batteries in the same group, thereby performing fewer calculations while achieving sufficient accuracy.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10923774B2Battery state estimating device and power supply device

Publication Date: 2021.02.16 DENSO CORP

AI summary

A battery state estimating device estimates a battery state in a battery module having a plurality of secondary batteries. The battery state estimating device is configured to be able to change a number of targets which is a number of the secondary batteries subject to estimation of the battery state of the secondary battery based on a specific value acquired from the plurality of secondary batteries, or the battery state estimating device is configured to be able to change a calculation formula for estimating the battery state of the battery to a calculation formula with a small calculation load.