# US 10,770,764 B2 · Battery pack

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- Number: US 10,770,764 B2
- Document ID: US10770764B2
- Status: Granted
- Kind: B2
- Application number: 16/142,086
- Filed: 2018-09-26
- Published: 2019-04-11
- Granted: 2020-09-08
- Earliest claimed: 2017-10-05
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Aki Yamashita
- Web page: https://patentgrep.com/patent/US10770764B2

## CPC

- H01M 10/6551: Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
- H01M 10/613: Cooling or keeping cold
- H01M 10/625: Vehicles
- H01M 10/647: Prismatic or flat cells, e.g. pouch cells
- H01M 10/6556: Solid parts with flow channel passages or pipes for heat exchange (closed pipes H01M10/6552)
- B60L 50/64: Constructional details of batteries specially adapted for electric vehicles
- H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence)
- H01M 50/224: Metals
- H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64)
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A battery pack includes a plurality of batteries that include heat dissipation surfaces, a cooler that cools each of the plurality of the batteries through each of the heat dissipation surfaces, and a viscous layer that is interposed between each of the heat dissipation surfaces and the cooler. The viscous layer contains a filler having a negative thermal expansion coefficient.

## Claims

### Claim 1

A battery pack comprising:
a plurality of batteries that include heat dissipation surfaces respectively;
a cooler that cools each of the plurality of the batteries through each of the heat dissipation surfaces; and
a viscous layer that is interposed between each of the heat dissipation surfaces and the cooler, the viscous layer containing a filler having a negative thermal expansion coefficient,
wherein a ratio of a mass of the filler to a mass of all constituents in the viscous layer other than the filler is equal to or larger than 0.4 wt % and is equal to or smaller than 1.25 wt %.

### Claim 2 (depends on 1)

The battery pack according to claim 1, wherein
the batteries are aligned with one another.

### Claim 3 (depends on 1)

The battery pack according to claim 1, wherein
the thermal expansion coefficient of the filler is equal to or smaller than −0.5×10−6 K−1,
K represents kelvin.

### Claim 4 (depends on 1)

The battery pack according to claim 1, wherein
the filler is a spherical glass filler.

### Claim 5 (depends on 1)

The battery pack according to claim 1, wherein the viscous layer has a thickness of 1.8 mm to 4.8 mm.

### Claim 6 (depends on 1)

The battery pack according to claim 1, wherein the viscous layer comprises a heat dissipation grease in which the negative coefficient filler is dispersed.

### Claim 7 (depends on 6)

The battery pack according to claim 6, wherein the heat dissipation grease contains 45 to 50 wt % of aluminum oxide (Al2O3), 17 to 21 wt % of zinc oxide (ZnO), and 30 wt % of a grease silicon resin.

### Claim 8 (depends on 1)

The battery pack according to claim 1, wherein the cooler is configured so that a cooling medium flows through an interior thereof.