# US 12,119,697 B2 · Voltage regulation circuit and system for traction battery and control method thereof

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- Number: US 12,119,697 B2
- Document ID: US12119697B2
- Status: Granted
- Kind: B2
- Application number: 18/594,808
- Filed: 2024-03-04
- Published: 2024-07-25
- Granted: 2024-10-15
- Earliest claimed: 2022-05-12
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Yuanmiao Zhao; Zhimin Dan; Yu Yan; Zhanliang Li; Xiaojian Huang; Xinwei Chen
- Web page: https://patentgrep.com/patent/US12119697B2

## CPC

- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H02J 7/933: {the cycle being controlled or terminated in response to electric parameters}
- B60L 1/006: {to power outlets}
- B60L 53/24: Using the vehicle's propulsion converter for charging
- B60L 58/13: Maintaining the SoC within a determined range
- B60L 58/18: of two or more battery modules
- B60L 58/27: by heating
- H01M 10/615: Heating or keeping warm
- H01M 10/63: Control systems (charging or discharging in response to temperature H01M10/44 {, H01M10/443}; measurement of temperature H01M10/48 {, H01M10/486})
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 7/52: for charge balancing, e.g. equalisation of charge between batteries
- H02J 7/60: including safety or protection arrangements
- H02J 7/62: against overcurrent
- H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)}
- H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)}
- H02J 7/875: {Charging or discharging for charge maintenance, battery initiation or rejuvenation}
- H02J 7/90: Regulation of charging or discharging current or voltage
- B60L 2240/547: Voltage
- H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV]
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- H02M 1/327: {against abnormal temperatures}
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 7/53871: {with automatic control of output voltage or current}
- 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
- 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
- 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
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A voltage regulation circuit for traction battery includes a traction battery, a heating module, a charge/discharge interface, and a voltage regulation module. The heating module includes a power storage element and a switch module. The traction battery is connected in parallel to the switch module. An external charging and discharging device is connected in parallel to the traction battery through the charge/discharge interface. The voltage regulation module includes a plurality of switches and a power storage regulation element, and the plurality of switches and the power storage regulation element are disposed between the charge/discharge interface and the traction battery. The voltage regulation module and the switch module are configured to regulate, in response to a voltage regulation control signal, a charge/discharge voltage between the traction battery and the power storage element and a charge voltage of the external charging and discharging device for the traction battery.

## Claims

### Claim 1

A voltage regulation circuit for traction battery, comprising:
a traction battery;
a heating module;
a charge/discharge interface; and
a voltage regulation module;
wherein
the heating module comprises a power storage element and a switch module;
the traction battery is connected in parallel to the switch module, and an external charging and discharging device is connected in parallel to the traction battery through the charge/discharge interface;
the voltage regulation module comprises a plurality of switches and a power storage regulation element, and the plurality of switches and the power storage regulation element are disposed between the charge/discharge interface and the traction battery; and
the voltage regulation module and the switch module are configured to regulate, in response to a voltage regulation control signal, a charge/discharge voltage between the traction battery and the power storage element and a charge voltage of the external charging and discharging device for the traction battery;
wherein
the voltage regulation module comprises a first switch, a second switch, a third switch, a fourth switch, and the power storage regulation element;
the first switch is disposed between the power storage element and the switch module;
the second switch is disposed between the power storage element and the charge/discharge interface;
the third switch and the fourth switch are respectively disposed on a negative electrode side and a positive electrode side of the charge/discharge interface; and
the power storage regulation element is disposed between the power storage element and the switch module and also between the power storage element and the charge/discharge interface;
wherein a fifth switch is provided on the positive electrode side of the traction battery, and a sixth switch is provided on the negative electrode side of the traction battery; and
wherein the fifth switch is connected in parallel to a branch, and the branch comprises a resistor and a seventh switch connected in series.

### Claim 2 (depends on 1)

The voltage regulation circuit according to claim 1, wherein
one terminal of the first switch is connected to the switch module, another terminal of the first switch is connected to a first terminal of the power storage regulation element, and a second terminal of the power storage regulation element is connected to the power storage element;
the first terminal of the power storage regulation element is also connected to one terminal of the second switch and the negative electrode side of the charge/discharge interface, and the other terminal of the second switch is connected to the positive electrode side of the charge/discharge interface;
the third switch is disposed between the negative electrode side of the charge/discharge interface and a negative electrode side of the traction battery; and
the fourth switch is disposed between the positive electrode side of the charge/discharge interface and a positive electrode side of the traction battery.

### Claim 3 (depends on 2)

The voltage regulation circuit according to claim 2, wherein
the switch module comprises a charge-discharge switching module and a leg set;
the charge-discharge switching module is connected in parallel to the leg set, a first terminal of the power storage element is connected to the leg set, a second terminal of the power storage element is connected to the second terminal of the power storage regulation element, the first terminal of the power storage regulation element is connected to one terminal of the first switch, and the other terminal of the first switch is connected to the charge-discharge switching module.

### Claim 4 (depends on 3)

The voltage regulation circuit according to claim 3, wherein a first capacitor is provided between the first terminal of the power storage regulation element and the negative electrode side of the charge/discharge interface.

### Claim 5 (depends on 1)

The voltage regulation circuit according to claim 1, wherein the power storage regulation element is an inductive element.

### Claim 6 (depends on 1)

The voltage regulation circuit according to claim 1, wherein
the switch module comprises a charge-discharge switching module and a leg set;
the charge-discharge switching module is connected in parallel to the leg set, a first terminal of the power storage element is connected to the leg set, and a second terminal of the power storage element is connected to the charge-discharge switching module.

### Claim 7 (depends on 6)

The voltage regulation circuit according to claim 6, wherein
the power storage element comprises an M-phase motor;
the leg set comprises M phase legs, M being a positive integer;
M phase windings of the M-phase motor are connected to joints between upper legs and lower legs of all of the M phase legs in one-to-one correspondence; and
the charge-discharge switching module comprises a first switching circuit and a second switching circuit connected in series, and a joint between the first switching circuit and the second switching circuit is connected to a neutral point of the M-phase motor.

### Claim 8 (depends on 7)

The voltage regulation circuit according to claim 7, wherein both the first switching circuit and the second switching circuit comprise a triode and a flyback diode connected in parallel.

### Claim 9 (depends on 7)

The voltage regulation circuit according to claim 7, wherein both the first switching circuit and the second switching circuit comprise a triode or a relay switch.

### Claim 10 (depends on 7)

The voltage regulation circuit according to claim 7, wherein
the first switching circuit comprises a diode and the second switching circuit comprises a switch; or
the first switching circuit comprises a switch and the second switching circuit comprises a diode.

### Claim 11 (depends on 7)

The voltage regulation circuit according to claim 7, wherein a switch and an inductor are provided between the joint between the first switching circuit and the second switching circuit and the neutral point of the M-phase motor.

### Claim 12 (depends on 1)

The voltage regulation circuit according to claim 1, wherein a second capacitor is connected in parallel to the traction battery.

### Claim 13 (depends on 1)

An electric device, comprising:
a control module; and
the voltage regulation circuit according to claim 1;
wherein the control module is connected to the switch module and the voltage regulation module, and is configured to control the voltage regulation module and the switch module to regulate the charge/discharge voltage between the traction battery and the power storage element and the charge voltage of the external charging and discharging device for the traction battery.

### Claim 14 (depends on 1)

A voltage regulation method for traction battery, applied to a voltage regulation system that comprises an external charging and discharging device and an electric device, the electric device comprising a control module and the voltage regulation circuit according to claim 1; wherein the method comprises:
obtaining an enabling signal from the control module; and
controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate a charge/discharge voltage between the traction battery and the power storage element; or
controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate a charge voltage of the external charging and discharging device for the traction battery.

### Claim 15 (depends on 14)

The voltage regulation method according to claim 14, wherein controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate the charge/discharge voltage between the traction battery and the power storage element comprises:
controlling the voltage regulation module and the switch module to enable the traction battery to charge the power storage element; or
controlling the voltage regulation module and the switch module to enable the power storage element to charge the traction battery.

### Claim 16 (depends on 14)

The voltage regulation method according to claim 14, wherein controlling, according to the enabling signal, the voltage regulation module and the switch module to regulate the charge voltage of the external charging and discharging device for the traction battery comprises:
obtaining a first voltage of the traction battery and a second voltage of the external charging and discharging device; and
controlling, according to the first voltage and the second voltage, the voltage regulation module and the switch module to regulate the charge voltage of the external charging and discharging device for the traction battery.

### Claim 17 (depends on 16)

The voltage regulation method according to claim 16, wherein controlling, according to the first voltage and the second voltage, the voltage regulation module and the switch module to regulate the charge voltage of the external charging and discharging device for the traction battery comprises:
when the first voltage is less than or equal to the second voltage, controlling the voltage regulation module and the switch module to enable the external charging and discharging device to charge the traction battery; and
when the first voltage is greater than the second voltage, controlling the voltage regulation module and the switch module to increase the charge voltage of the external charging and discharging device for charging the traction battery.

### Claim 18 (depends on 17)

The voltage regulation method for traction battery according to claim 17, wherein the switch module comprises a charge-discharge switching module and a leg set, the charge-discharge switching module is connected in parallel to the leg set, and the leg set comprises three phase legs; and the voltage regulation module comprises a first switch, a second switch, a third switch, a fourth switch, and a power storage regulation element;
wherein controlling the voltage regulation module and the switch module to enable the external charging and discharging device to charge the traction battery comprises:
controlling the third switch and the fourth switch to be on, and the first switch, the second switch, and the switch module to be off; and
wherein controlling the voltage regulation module and the switch module to increase the charge voltage of the external charging and discharging device for charging the traction battery comprises:
controlling the second switch, the third switch, and all upper legs in the leg set to be on, and the first switch, the fourth switch, and the charge-discharge switching module to be off.