# US 11,299,066 B2 · System of increasing temperature of battery for vehicle

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- Number: US 11,299,066 B2
- Document ID: US11299066B2
- Status: Granted
- Kind: B2
- Application number: 16/746,206
- Filed: 2020-01-17
- Published: 2021-02-25
- Granted: 2022-04-12
- Earliest claimed: 2019-08-21
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Dong Gyun Woo; Hyun Wook Seong; Jee Heon Kim
- Web page: https://patentgrep.com/patent/US11299066B2

## CPC

- B60L 58/25: by controlling the electric load
- B60L 58/27: by heating
- B60L 53/22: Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
- B60L 55/00: Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/625: Vehicles
- H01M 10/637: characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching (means for preventing undesired use or discharge H01M50/572)
- B60L 2240/549: Current
- H01M 2200/10: Temperature sensitive devices
- Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- Y04S 10/126: the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
- 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
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

## Abstract

A system of increasing a temperature of a battery for a vehicle includes: an on-board charger having a capacitor and a bidirectional direct current (DC) converter having first input/output terminals connected to the capacitor and second input/output terminals connected to a battery and configured to perform a bidirectional power transfer between the first input/output terminals and the second input/output terminals; and a controller to drive, when temperature rising of the battery is required, the bidirectional DC converter such that a direction of a power transfer alternates and supply an alternating current (AC) current having a predetermined frequency to the battery.

## Claims

### Claim 1

A system of increasing a temperature of a battery for a vehicle, the system comprising:
an on-board charger including a capacitor and a bidirectional direct current (DC) converter having first input/output terminals connected to the capacitor and second input/output terminals connected to a battery and configured to perform a bidirectional power transfer between the first input/output terminals and the second input/output terminals; and
a controller configured to:
drive, when temperature rising of the battery is required, the bidirectional DC converter such that a direction of a power transfer is alternated, and
supply an alternating current (AC) current having a predetermined frequency to the battery,
wherein the bidirectional DC converter includes:
a transformer;
a first switching circuit connected between the first input/output terminals and a primary winding of the transformer and including a plurality of switching elements; and
a second switching circuit connected between the second input/output terminals and a secondary winding of the transformer and including a plurality of switching elements.

### Claim 2 (depends on 1)

The system of claim 1, wherein:
the on-board charger further includes a power factor compensation circuit configured to:
convert external AC power into a direct current (DC) power and
apply the DC power to the capacitor in a charging mode in which the external AC power is converted into the DC power and the DC power is supplied to the battery; and
when the temperature rising of the battery is required, the controller does not operate the power factor compensation circuit.

### Claim 3 (depends on 1)

The system of claim 1, wherein the predetermined frequency is determined based on a current frequency in which impedance exhibits a lowest level compared to a current frequency-impedance characteristic of the battery in a low temperature condition.

### Claim 4 (depends on 1)

The system of claim 1, wherein, when the temperature rising of the battery is required, the controller is configured to control the plurality of switching elements of the first switching circuit and the plurality of switching elements of the second switching circuit to be alternately switched.

### Claim 5 (depends on 1)

The system of claim 1, wherein the controller is configured to alternately perform a forward direction operation in which the plurality of switching elements of the first switching circuit are switched on or off so that power is supplied from the capacitor to the battery and a reverse direction operation in which the switching plurality of elements of the second switching circuit are switched on or off so that power is supplied from the battery to the capacitor based on the predetermined frequency.

### Claim 6 (depends on 1)

The system of claim 1, wherein the first switching circuit is a bridge circuit which includes a first switching element and a second switching element which are connected in series between a positive terminal and a negative terminal of the first input/output terminals, and a third switching element and a fourth switching element which are connected in series between the positive terminal and the negative terminal of the first input/output terminals,
wherein the bridge circuit further includes: a first connection node between the first switching element and the second switching element, and a second connection node between the third switching element and the fourth switching element, and
wherein the first connection node is connected to a first end of the primary winding of the transformer, and the second connection node is connected to a second end of the primary winding of the transformer.

### Claim 7 (depends on 1)

The system of claim 1, wherein the second switching circuit is a bridge circuit which includes a fifth switching element and a sixth switching element which are connected in series between a positive terminal and a negative terminal of the second input/output terminals, and a seventh switching element and an eighth switching element which are connected in series between the positive terminal and the negative terminal of the second input/output terminals, and
wherein in bridge circuit, a connection node between the fifth switching element and the sixth switching element is connected to a first end of the secondary winding of the transformer, and a connection node between the seventh switching element and the eighth switching element is connected to a second end of the secondary winding of the transformer.

### Claim 8 (depends on 1)

The system of claim 1, wherein the predetermined frequency is smaller than a switching frequency of the plurality of switching elements of the first switching circuit or a switching frequency of the plurality of switching elements of the second switching circuit.