# US 11,309,598 B2 · Heating control method and heating control device

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- Number: US 11,309,598 B2
- Document ID: US11309598B2
- Status: Granted
- Kind: B2
- Application number: 16/233,096
- Filed: 2018-12-27
- Published: 2019-11-28
- Granted: 2022-04-19
- Earliest claimed: 2018-05-22
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Zhimin Dan; Wenbin Lu; Wei Zhang; Yizhen Hou; Teng Yu; Xiyang Zuo; Xingyuan Wu; Taosheng Zhu
- Web page: https://patentgrep.com/patent/US11309598B2

## CPC

- H01M 10/615: Heating or keeping warm
- H05B 1/023: {Industrial applications}
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/633: characterised by algorithms, flow charts, software details or the like
- H01M 10/651: characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
- H01M 10/6571: Resistive heaters (arrangements for heating the battery by its resistance to the internal current H01M10/637)
- G01R 19/16528: {using digital techniques or performing arithmetic operations (using digital techniques to measure a voltage or a current, see G01R19/25)}
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- 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
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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

The present disclosure provides a heating control method and a heating control device. The heating control method includes: acquiring an average current value in a heating circuit of a power battery pack; calculating a current output value required for nth cycle according to an average current value of the nth cycle, an average current value of (n−1)th cycle, an average current value of (n−2)th cycle, a preset current value, n is equal to or greater than 3; outputting a PWM signal to a switch device of the heating circuit according to a pre-calibrated PWM control parameter corresponding to the current output value so that a difference between an actual current value in the heating circuit and the preset current value is less than a preset threshold.

## Claims

### Claim 1

A heating control method, comprising:
acquiring, by a heating controlling device, an average current value in a heating circuit of a power battery pack based on currents sampled by an analog-to-digital converter, wherein the average current value comprises an average current value of an nth cycle, and an average current value of an (n−1)th cycle and an average current value of an (n−2)th cycle, wherein the n is equal to or greater than 3 and wherein each cycle is a period of time for current sampling;
calculating, by the heating controlling device, a current output value required for the nth cycle according to the average current value of the nth cycle, the average current value of the (n−1)th cycle, the average current value of the (n−2)th cycle and a preset current value; and
outputting, by the heating controlling device, a Pulse width Modulation (PWM) signal to a switch device of the heating circuit according to a pre-calibrated PWM control parameter, wherein the pre-calibrated PWM control parameter corresponds to the current output value required for the nth cycle,
wherein an actual current value is generated in the heating circuit according to switching of the switch device based on the PWM signal, and wherein a difference between the actual current value and the preset current value is less than a preset threshold, and wherein the power battery pack is heated by a discharge process and a charging process with the generated actual current value;
wherein the calculating of the current output value required for the nth cycle according to the average current value of the nth cycle, the average current value of the (n˜1)th cycle, the average current value of the (n−2)th cycle and the preset current value comprises:
setting a difference between the preset current value and the average current value of the nth cycle as an nth cycle difference value, setting a difference between the preset current value and the average current value of the (n−1)th cycle as an (n−1)th cycle difference value, and setting a difference between the preset current value and the average current value of the (n−2)th cycle as an (n−2)th cycle difference value;
acquiring a state of charge section of the power battery pack from a battery management system;
determining a current increment required for the nth cycle according to a pre-calibrated feedback adjustment coefficient corresponding to the state of charge section, the nth cycle difference value, the (n−1)th cycle difference value and the (n−2)th cycle difference value;
determining the current output value required for the nth cycle based on the current increment and the average current value of the (n−1)th cycle.

### Claim 2 (depends on 1)

The method according to claim 1, wherein before the determining of the current increment required for the nth cycle according to the pre-calibrated feedback adjustment coefficient corresponding to the state of charge section, the nth cycle difference value, the (n−1)th cycle difference value and the (n−2)th cycle difference value, the method further comprises:
determining a relationship between state of charge sections of the power battery pack and feedback adjustment coefficients, wherein the state of charge sections comprises the acquired state of charge section, and the feedback adjustment coefficients comprises the pre-calibrated feedback adjustment coefficient.

### Claim 3 (depends on 2)

The method according to claim 2, wherein each of the feedback adjustment coefficients comprises a proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient, and the determining of the relationship between the state of charge sections of the power battery pack and the feedback adjustment coefficients comprises:
for each of the state of charge sections, gradually increasing the proportional adjustment coefficient from 0 until a change rate of the average current value is greater than a first threshold determined based on the proportional adjustment coefficient, and determining a relationship between the state of charge section and the proportional adjustment coefficient;
for each of the state of charge sections, gradually increasing the integral adjustment coefficient from 0 until fluctuation magnitude of the average current value is greater than a second threshold determined based on the integral adjustment coefficient, and determining a relationship between the state of charge section and the integral adjustment coefficient;
for each of the state of charge sections, gradually increasing the differential adjustment coefficient from 0 until the fluctuation magnitude of the average current value is greater than a third threshold determined based on the differential adjustment coefficient, and determining a relationship between the state of charge section and the differential adjustment coefficient.

### Claim 4 (depends on 1)

The method according to claim 1, wherein before the outputting of the Pulse width Modulation (PWM) signal to the switch device of the heating circuit according to the pre-calibrated PWM control parameter, the method further comprises: for each of the state of charge sections,
continuously adjusting a value of a PWM control parameter; and
determining the value of the PWM control parameter when the average current value of the heating circuit reaches to be constant as the pre-calibrated PWM control parameter.

### Claim 5 (depends on 1)

The method according to claim 1, wherein before the acquiring the average current value in the heating circuit of the power battery pack, the method further comprises:
acquiring, in the case that the power battery pack has a demand of being heated, power requirement for the power battery pack being heated from a temperature at the nth cycle to a target temperature;
determining whether the state of charge of the power battery pack meets the power requirement;
obtaining the average current value in the heating circuit of the power battery pack if the state of charge of the power battery pack meets the power requirement.

### Claim 6 (depends on 5)

The method according to claim 5, wherein after the determining whether the state of charge of the power battery pack meets the power requirement, the method further comprises:
sending a charging prompt signal to a battery management system (BMS) of the power battery pack if the state of charge of the power battery pack does not meet the power requirement in order to charge the power battery pack until the state of charge of the power battery pack meets the power requirement.

### Claim 7 (depends on 1)

The method according to claim 1, wherein after the outputting the Pulse width Modulation (PWM) signal to the switch device of the heating circuit according to the pre-calibrated PWM control parameter, the method further comprises:
stopping outputting the PWM signal if the heating circuit satisfies any one of predetermined stopping conditions including: the average current value in the heating circuit is greater than an allowable current threshold, any cell in the power battery pack has a temperature and voltage greater than an allowable operating range, and temperature of the power battery pack reaches the target temperature.

### Claim 8 (depends on 1)

A non-transitory computer-readable storage medium having stored thereon computer instructions, that when executed by a processor, cause the processor to implement steps of the method according to claim 1.