# US 9,519,030 B2 · Voltage detection device

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- Number: US 9,519,030 B2
- Document ID: US9519030B2
- Status: Granted
- Kind: B2
- Application number: 14/435,353
- Filed: 2013-09-26
- Published: 2015-10-15
- Granted: 2016-12-13
- Earliest claimed: 2012-10-18
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Hironao Fujii
- Web page: https://patentgrep.com/patent/US9519030B2

## 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 10/482: {for several batteries or cells simultaneously or sequentially}
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs
- H02J 7/80: including monitoring or indicating arrangements
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. 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
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

It is provided that pull-down resistors (R1 to Rn-1) which are respectively connected in parallel to blocks (CB1 to CBn−1) except for a block (CBn) that corresponds to a battery monitoring IC (2n) connected to a main microcomputer (3) via an insulation I/F (4) so as to be capable of communication, thereby equalizing current consumed in battery monitoring ICs (21 to 2n).

## Claims

### Claim 1

A voltage detection device, comprising:
a plurality of voltage detection units that are respectively provided in correspondence to a plurality of blocks which are obtained by dividing a plurality of unit cells connected in series, each of the plurality of voltage detection units being fed from corresponding one of the plurality of blocks and operated to detect a voltage across each of the unit cells constituting the corresponding one of the plurality of blocks;
a control unit that receives detection results from the plurality of voltage detection units;
an insulation interface that connects between one of the plurality of voltage detection units and the control unit so as to be capable of communication therebetween;
current consumption elements that are respectively connected in parallel to the plurality of blocks except for the block which corresponds to the voltage detection unit connected to the control unit via the insulation interface so as to be capable of communication, thereby equalizing current consumed in the plurality of voltage detection units,
wherein the plurality of voltage detection units are connected in cascade so as to be capable of communication mutually.

### Claim 2 (depends on 1)

The voltage detection device according to claim 1, wherein one of the plurality of voltage detection units located on one end side of the plurality of voltage detection units connected in cascade is connected to the control unit via the insulation interface so as to be capable of communication.

### Claim 3 (depends on 2)

The voltage detection device according to claim 2, wherein one of the current consumption elements, connected in parallel to the block which corresponds to one of the plurality of voltage detection units located on the other end side of the plurality of voltage detection units connected in cascade, flows current larger than current flowing through the others of the current consumption elements.