# US 10,502,795 B2 · Battery monitoring system and semiconductor device

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- Number: US 10,502,795 B2
- Document ID: US10502795B2
- Status: Granted
- Kind: B2
- Application number: 15/397,830
- Filed: 2017-01-04
- Published: 2017-04-27
- Granted: 2019-12-10
- Earliest claimed: 2013-07-11
- Assignees: Lapis Semiconductor Co., Ltd.
- Applicants: Lapis Semiconductor Co., Ltd.
- Inventors: Naoaki Sugimura
- Web page: https://patentgrep.com/patent/US10502795B2

## CPC

- G01R 31/396: Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
- G01R 31/3835: involving only voltage measurements
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- H01M 2200/00: Safety devices for primary or secondary batteries
- Y02E 60/10: Energy storage using batteries
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A battery monitoring system includes a plurality of battery cells connected in series; a cell voltage measurement circuit for measuring a voltage of the battery cells; a first terminal connected to the cell voltage measurement circuit; a second terminal having a potential higher than that of the first terminal; and a protection circuit connected to the second terminal for discharging an electric current to the second terminal so that the cell voltage measurement circuit is protected.

## Claims

### Claim 1

A battery monitoring system comprising:
a plurality of battery cells connected in series;
a cell voltage measurement circuit for measuring a voltage of the battery cells;
a first terminal connected directly to the cell voltage measurement circuit with no circuitry element in between;
a second terminal isolated from the cell voltage measurement circuit, said second terminal having a potential higher than that of the first terminal; and
a protection circuit connected to the second terminal for discharging an electric current from a protection element to the second terminal so that the cell voltage measurement circuit is protected.

### Claim 2 (depends on 1)

The battery monitoring system according to claim 1, further comprising a first filter connected to the first terminal.

### Claim 3 (depends on 2)

The battery monitoring system according to claim 2, wherein said first filter is a low pass filter formed of a resistor and a capacitor.

### Claim 4 (depends on 1)

The battery monitoring system according to claim 1, further comprising a second filter connected to the second terminal.

### Claim 5 (depends on 4)

The battery monitoring system according to claim 4, wherein said second filter is a low pass filter formed of a resistor and a capacitor.

### Claim 6

A semiconductor device capable of measuring a voltage of a plurality of battery cells connected in series, comprising:
a cell voltage measurement circuit for measuring the voltage of the battery cells;
a first terminal connected directly to the cell voltage measurement circuit with no circuitry element in between;
a second terminal isolated from the cell voltage measurement circuit, said second terminal having a potential higher than that of the first terminal; and
a protection circuit connected to the second terminal for discharging an electric current from a protection element to the second terminal so that the cell voltage measurement circuit is protected.

### Claim 7 (depends on 1)

The battery monitoring system according to claim 1, further comprising a third terminal connected to the battery cells, said third terminal being connected to the cell voltage measurement circuit through the protection element.

### Claim 8 (depends on 6)

The semiconductor device according to claim 6, further comprising a third terminal connected to the battery cells, said third terminal being connected to the cell voltage measurement circuit through the protection element.