# US 2010/0167110 A1 · Method and system for battery protection

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- Number: US 2010/0167110 A1
- Document ID: US20100167110A1
- Status: Published application
- Kind: A1
- Application number: 12/558,919
- Filed: 2009-09-14
- Published: 2010-07-01
- Earliest claimed: 2002-11-22
- Assignees: Milwaukee Electric Tool Corporation
- Inventors: Todd W. Johnson; Jay J. Rosenbecker; Gary D. Meyer; Jeffrey M. Zeiler; Kevin L. Glasgow; Jonathan Z. Zick; Jeffrey M. Brozek; Karl F. Scheucher
- Web page: https://patentgrep.com/patent/US20100167110A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F 5/008: {Cooling means}
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 10/4207: {for several batteries or cells simultaneously or sequentially}
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries}
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells
- H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence)
- H01M 50/247: specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J 7/04: Regulation of charging current or voltage
- H02J 7/52: for charge balancing, e.g. equalisation of charge between batteries
- H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs
- H02J 7/61: against overcharge
- H02J 7/63: against overdischarge
- H02J 7/65: against overtemperature
- H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)}
- H02J 7/68: using circuits for correcting or protecting against reverse-polarity
- H02J 7/751: {concerning the insertion or the connection of the batteries}
- H02J 7/855: {with circuits adapted for supplying loads from the battery}
- H02J 7/92: with prioritisation of loads or sources
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- H01M 10/46: Accumulators structurally combined with charging apparatus (circuits for charging H02J7/00)
- H01M 50/227: Organic material
- H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543)
- 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 2010/4278: {Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller}
- H01M 2200/00: Safety devices for primary or secondary batteries
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- H02J 7/64: against overvoltage
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A battery pack. The battery pack includes a housing, a plurality of terminals, a plurality of lithium-based battery cells, and a controller. The plurality of terminals electrically connect to an electrical device. The electrical device is able to support the battery pack. Each of the plurality of battery cells are individually tapped and have an individual state of charge. The plurality of terminals includes a sense terminal. The controller is operable to monitor a characteristic of each of the plurality of battery cells and to communicate the monitored characteristic of each of the plurality of battery cells to the electrical device via the sense terminal.

## Claims

### Claim 1

A battery pack, comprising:
a housing;
a plurality of terminals to electrically connect to an electrical device, the battery pack supportable by the electrical device, the plurality of terminals including a sense terminal;
a plurality of lithium-based battery cells, each of the plurality of battery cells being individually tapped and having an individual state of charge; and
a controller operable to monitor a characteristic of each of the plurality of battery cells and to communicate the monitored characteristic of each of the plurality of battery cells to the electrical device via the sense terminal.

### Claim 2 (depends on 1)

The battery pack of claim 1, wherein the plurality of terminals includes at least three terminals including a positive terminal, a negative terminal, and the sense terminal.

### Claim 3 (depends on 1)

The battery pack of claim 1, wherein the electrical device is at least one of a power tool and a battery charger.

### Claim 4 (depends on 1)

The battery pack of claim 1, wherein the characteristic is the individual state of charge.

### Claim 5 (depends on 1)

The battery pack of claim 1, wherein the characteristic is an individual cell temperature.

### Claim 6 (depends on 1)

The battery pack of claim 1, wherein the controller communicates serially with the electrical device via the sense terminal.

### Claim 7 (depends on 1)

The battery pack of claim 1, wherein the electrical device sends a command to the battery pack.

### Claim 8 (depends on 7)

The battery pack of claim 7, wherein the command is to determine an average of voltage measurements of the plurality of battery cells over a period of time.

### Claim 9 (depends on 1)

The battery pack of claim 1, wherein the controller communicates data to the electrical device, the data including at least one of calibration data, charging instructions, a quantity of charge cycles executed, an estimated life expectancy, and discharging data.

### Claim 10 (depends on 1)

The battery charger of claim 1, wherein the battery cells have a lithium-manganese spinel chemistry.

### Claim 11 (depends on 1)

The battery pack of claim 1, wherein the battery pack is operable to provide an average discharge current of 20 amps.

### Claim 12 (depends on 1)

The battery pack of claim 1, wherein the battery pack has a capacity of at least 3.0 ampere-hours.