Method and apparatus for automatically computing work accuracy of a battery management system offline

• US 9,817,074 B1
• Filed: 02/22/2017
• Issued: 11/14/2017
• Est. Priority Date: 02/22/2017
• Status: Expired due to Fees

• Current Assignee: Bordrin Motor Corporation, Inc.
• Original Assignee: Bordrin Motor Corporation, Inc.
• Inventors: Li, Yonghua, Zhang, Zhiwei
• Primary Examiner(s): Ingram, Thomas
• Application Number:
  US15/439,382
• Time in Patent Office: 265 Days
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method and an apparatus for automatically computing work accuracy of a battery management system (BMS) includes the steps of controlling an automobile component simulation module to work, sending a work command to the BMS at the test moment t, and reading a prediction parameter, stopping working when the work command is completed, reading a work parameter and computing state of power (SOP) test accuracy of the BMS, determining whether a temperature of the battery pack exceeds a temperature threshold, if so, controlling a thermal management module to start working, and returning to the determination step, and otherwise, reading a stabilized parameter and performing computation to obtain state of charge (SOC) test accuracy of the BMS.

Claims

1. An apparatus for automatically computing work accuracy of a battery management system (BMS) offline and configured to detect the work accuracy of the BMS offline connected to a battery pack, the apparatus comprising:

a vehicle control unit, connected to the BMS and configured to send a work command to the BMS and compute the work accuracy of the BMS according to a parameter fed back by the BMS;

an automobile component simulation module, connected to the battery pack and vehicle control unit separately and configured to provide energy consumption and charging, required by an automobile component, of energy of the battery pack according to the work command of the vehicle control unit;

a thermal management module, connected to the battery pack and the vehicle control unit separately and configured to perform heat dissipation on the battery pack according to a command of the vehicle control unit; and

wherein the automobile component simulation module comprises;

an adjustable resistor energy-consuming component, comprising a first relay and an energy-consuming resistor and configured to provide the energy consumption, required by the automobile component, for the battery pack according to the work command of the vehicle control unit; and

an excitation charging component, comprising a second relay, an excitation power source, and a protective adjustable resistor and configured to provide the charging, required by the automobile component, for the battery pack according to the work command of the vehicle control unit.

2. The apparatus for automatically computing work accuracy of a BMS offline according to claim 1, wherein the thermal management module comprises a fan, a heat sink, and a water pump that are connected in series in sequence, and the fan, the heat sink, and the water pump are all connected to the battery pack to perform heat dissipation on the battery pack.

3. An apparatus for automatically computing work accuracy of a battery management system (BMS) offline and configured to detect the work accuracy of the BMS offline connected to a battery pack, the apparatus comprising:

a vehicle control unit, connected to the BMS and configured to send a work command to the BMS and compute the work accuracy of the BMS according to a parameter fed back by the BMS;

an automobile component simulation module, connected to the battery pack and vehicle control unit separately and configured to provide energy consumption and charging, required by an automobile component, of energy of the battery pack according to the work command of the vehicle control unit;

a thermal management module, connected to the battery pack and the vehicle control unit separately and configured to perform heat dissipation on the battery pack according to a command of the vehicle control unit;

wherein the thermal management module comprises a fan, a heat sink, and a water pump that are connected in series in sequence, and the fan, the heat sink, and the water pump are all connected to the battery pack to perform heat dissipation on the battery pack; and

wherein the thermal management module further comprises;

an external power source, and the external power source is connected to the fan, the heat sink, and the water pump in series to provide work power for the fan, the heat sink, and the water pump; and

wherein the external power source provided energy to the thermal management module when the BMS is offline and does not provide energy to the thermal management module when the BMS is online.

4. An apparatus for automatically computing work accuracy of a battery management system (BMS) offline and configured to detect the work accuracy of the BMS offline connected to a battery pack, the apparatus comprising:

a vehicle control unit, connected to the BMS and configured to send a work command to the BMS and compute the work accuracy of the BMS according to a parameter fed back by the BMS;

an automobile component simulation module, connected to the battery pack and vehicle control unit separately and configured to provide energy consumption and charging, required by an automobile component, of energy of the battery pack according to the work command of the vehicle control unit; and

a thermal management module, connected to the battery pack and the vehicle control unit separately and configured to perform heat dissipation on the battery pack according to a command of the vehicle control unit; and

wherein the vehicle control unit is configured to;

s1) control an automobile component simulation module to start working, and reading, by the BMS, a work state of a battery pack;

s2) generate a test moment t, sending a work command to the BMS at the test moment t, and reading a prediction parameter fed back by the BMS;

s3) control the automobile component simulation module to stop working when a work command completion time arrives;

s4) read a work parameter fed back by the BMS, and with reference to the prediction parameter of step s2), computing state of power (SOP) test accuracy ε

_SOP of the BMS;

s5) determine whether a temperature of the battery pack exceeds a temperature threshold, if so, controlling a thermal management module to start working, and returning to step s5), and otherwise, performing step s6); and

s6) read a stabilized parameter of the BMS at a current moment, and with reference to the prediction parameter of step s2), performing computation to obtain state of charge (SOC) test accuracy ε

_SOC of the BMS.

5. The apparatus for automatically computing work accuracy of a BMS offline according to claim 4, wherein the vehicle control is further configured to generate the test moment by

s21) generate a random number N;

s22) determine whether the random number N is greater than a random number threshold N_cal, if so, performing step s23), and otherwise, returning to step s21); and

s23) generate a test moment t according to the random number N, wherein the test moment t is specifically;

t=t_min+N×

T

wherein t_min is a minimum work time of the automobile component simulation module, and T is a specified cycle time.

6. The apparatus for automatically computing work accuracy of a BMS offline according to claim 4, wherein the prediction parameter comprises an SOC value SOC_cal1 and a minimum voltage value V_min, predicted by the BMS, of the battery pack when the work command is completed.

7. The apparatus for automatically computing work accuracy of a BMS offline according to claim 6, wherein the minimum voltage value V_min is specifically:

V_min=min(V_req,V_cal)

wherein V_req is a voltage value required in the work command sent by the vehicle control unit, and V_cal is an available voltage value obtained by the BMS by means of computation according to the read work state of the battery pack.

8. The apparatus for automatically computing work accuracy of a BMS offline according to claim 6, wherein the vehicle control unit is configured to:

s41) reading, by the vehicle control unit, a work parameter, that is, a voltage value V_cal1 of the battery pack at a current moment, fed back by the BMS; and

s42) computing, by the vehicle control unit, the SOP test accuracy ε

_SOP of the BMS according to the voltage value of the battery pack at the current moment obtained in step s41), wherein the SOP test accuracy ε

_SOP is specifically;

9. The apparatus for automatically computing work accuracy of a BMS offline according to claim 6, wherein the vehicle control unit is configured to:

s61) read a stabilized parameter of the BMS at a current moment, that is, a voltage value V_cal2 of the battery pack at a current moment;

s62) reversely derive, according to the voltage value of the battery pack at the current moment obtained in step s61), an SOC value SOC_cal2 of the battery pack at the current moment from an SOC-OCV curve of the battery pack; and

s63) compute the SOC test accuracy ε

_SOC of the BMS according to the SOC value SOC_cal2 of the battery pack at the current moment obtained in step s62), wherein the SOC test accuracy ε

_SOC is specifically;