# US 7,411,400 B2 · Method for testing battery condition

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- Number: US 7,411,400 B2
- Document ID: US7411400B2
- Status: Granted
- Kind: B2
- Application number: 10/707,521
- Filed: 2003-12-19
- Published: 2005-06-23
- Granted: 2008-08-12
- Earliest claimed: 2003-12-19
- Assignees: Battery Control Corp.
- Inventors: Moshe Averbuch
- Web page: https://patentgrep.com/patent/US7411400B2

## CPC

- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- G01R 31/3842: combining voltage and current measurements
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

According to this invention a battery testing device is provided. Such device activates a shortening between the battery poles using a predefined electronic circuit (in order to maximize the battery's energy potential) for a time period of 10-50 μsec. In a subsequent time period of ˜100-200 μsec, the loading is slowly decreased until the voltage returns to an open circuit voltage UOC. During the testing process, the voltage and the battery current are measured. The measurements are stored at the device database, to be later used in an algorithm for checking battery conditions.

## Claims

### Claim 1

A method for measuring a battery's condition, comprising the steps of:
a) shortening between battery poles by using a designated electric circuit for a short time period, producing high current in said electric circuit, wherein the designated electric circuit is designed to carry high current load;
b) measuring process data including voltage and current during said time period;
c) storing measurements of said process data;
d) analyzing the condition of said battery based on predetermined battery parameters and said process data measurements.

### Claim 2 (depends on 1)

The method of claim 1 wherein the analyzing process includes the steps of checking the correlation between measured current and voltage respective to time and comparing same to predefined current/voltage correlations.

### Claim 3 (depends on 1)

The method of claim 1, enabling to check condition of the battery testing clamps contacts, further comprising the steps of evaluating clamps contacts condition by comparing measured process data to predefined values.

### Claim 4 (depends on 1)

The method of claim 1 wherein said analysis includes a comparison of said measured data to a predefined battery condition table.

### Claim 5 (depends on 1)

The method of claim 1 wherein said short time period ranges between 10 μsec and 50 μsec.

### Claim 6 (depends on 1)

The method of claim 1 wherein the high current produced ranges between 20-60 A for every 1 Ah of battery capacitance.

### Claim 7 (depends on 1)

The method of claim 1, wherein said conditions include CCA, SOC and SOH.

### Claim 8 (depends on 1)

The method of claim 1, wherein said battery includes automotive accumulators, accumulators for UPS systems and solar energy unit.

### Claim 9 (depends on 1)

The method of claim 1 wherein said snubber circuit includes a capacitor connected to at least one resistor and at least one diode.

### Claim 10 (depends on 1)

The method of claim 1 wherein the snubber circuit includes a capacitor connected in parallel to at least one resistor and serially to one power switch.

### Claim 11 (depends on 10)

The method of claim 10, wherein the snubber circuit is activated before the load decrease.

### Claim 12

An apparatus for measuring battery condition by shortening between battery poles for a short time period of 10 μsec to 50 μsec producing high current, said apparatus comprised of:
snubber circuit enabling to prevent results of rapid current decreasing;
at least two resistors enabling accurate measurement of voltage;
A/D converter for receiving digital output data of analog measurements;
microcontroller for analyzing measured data based on predefined battery parameters values;
display unit for presenting output results of battery condition.

### Claim 13 (depends on 1)

The apparatus of claim 1 wherein the snubber circuit includes a capacitor connected to at least one resistor and at least one diode.

### Claim 14 (depends on 1)

The apparatus of claim 1 wherein the snubber circuit includes a capacitor connected in parallel to at least one resistor and serially to one power switch.

### Claim 15 (depends on 1)

The apparatus of claim 1 wherein the snubber circuit includes a designated inductive components for increased back current and for preventing energy losses during shortening process.