CHARGING BALANCING SYSTEM BASED ON BATTERY OPERATING PROCESS AND METHOD THEREOF

• US 20150115892A1
• Filed: 10/30/2013
• Published: 04/30/2015
• Est. Priority Date: 10/30/2013
• Status: Active Grant

• Current Assignee: Metal Industries Research and Development Centre
• Original Assignee: Metal Industries Research and Development Centre
• Inventors: CHEN, Sheng-Wei, LIAO, Kuan-Yuen, LIU, Wen-Jiun, LIN, Jeng-Chyan
• Granted Patent: US 9,118,190 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A charging balancing system and method thereof based on a battery operating process and are disclosed. This is done by detecting a state of all cells in a detecting battery assembly to generate detection parameters, analyzing the detection parameters to produce an operating process, selecting at least one of residual power estimation methods according to the operating process, so as to calculate a residual power of each cell, and adjusting the charging current and charging time for each cell according to the residual power. As such, the efficiency of charging balancing is promoted.

Claims

1. A charging balancing system based on a battery operating process applied onto a battery assembly having a plurality of cells, comprising:

a storing module, pre-storing a plurality of state of charge (SOC) estimation methods;

a detecting module, continuously detecting and recording a state of each of the plurality of cells to generate a set of detection parameters, respectively;

a micro-processing unit, analyzing the set of parameters to produce an operating process, selecting at least one of the plurality of SOC estimation methods from the storing module to calculate a SOC of the respective cells according to the operating process; and

a charging balancing module, adjusting a charging current and a charging time of the respective cells according to the calculated SOC of the respective cells to enable the respective cells to maintain charging balanced.

2. The charging balancing system as claimed in claim 1, further comprising a weighting module, pre-storing a weighting value corresponding to the respective SOC estimation methods, and the weighting value is based on to calculate the SOC of the respective cells by the micro-processing unit.

3. The charging balancing system as claimed in claim 1, wherein the plurality of SOC estimation methods include an ampere-hour method, a Coulomb counting method, an inner-resistance method, a voltage look-up table method, and a vector SOC estimation method.

4. The charging balancing system as claimed in claim 3, wherein the vector SOC estimation method calculates the SOC of the respective cells by continuously calculating a dynamic battery inner-resistance index according to the set of detection parameters by looking up from an electric capacity variation look-up table to produce a component of a dynamic battery inner-resistance electric capacity, producing a component of a battery Coulomb counting electric capacity according to the set of detection parameters, and summing the component of the dynamic battery inner-resistance electric capacity and the component of the battery Coulomb counting electric capacity to calculate the SOC of the respective cells.

5. The charging balancing system as claimed in claim 4, wherein the electric capacity variation look-up table includes a relationship between the dynamic battery inner-resistance index and a capacity of at least a discharging current amount.

6. A charging balancing method based on a battery operating process applied onto a battery assembly having a plurality of cells, comprising steps of:

pre-storing a plurality of state of charge (SOC) estimation methods;

continuously detecting and recording a state of each of the plurality of cells to generate a set of detection parameters, respectively;

analyzing the set of parameters to produce an operating process, selecting at least one of the plurality of SOC estimation methods from the storing module to calculate a SOC of the respective cells according to the operating process; and

adjusting a charging current and a charging time of the respective cells according to the calculated SOC of the respective cells to enable the respective cells to maintain charging balanced.

7. The charging balancing method as claimed in claim 6, further comprising a step of pre-storing a weighting value corresponding to the respective SOC estimation methods, the weighting value being based on to calculate the SOC of the respective cells.

8. The charging balancing method as claimed in claim 6, wherein the set of detection parameters is selected from a group consisting of a close circuit voltage value, a close circuit current value, a discharging current amount, a temperature, a charging/discharging number, and a discharging depth of the respective cell.

9. The charging balancing method as claimed in claim 6, wherein the plurality of SOC estimation methods include an ampere-hour method, a Coulomb counting method, an inner-resistance method, a voltage look-up table method, and a vector SOC estimation method.

10. The charging balancing method as claimed in claim 9, wherein the vector SOC estimation method calculates the SOC of the respective cells by continuously calculating a dynamic battery inner-resistance point according to the set of detection parameters by looking up from an electric capacity variation look-up table to produce a component of a dynamic battery inner-resistance electric capacity, producing a component of a battery Coulomb counting electric capacity according to the set of detection parameters, and summing the component of the dynamic battery inner-resistance electric capacity and the component of the battery Coulomb counting electric capacity to calculate the SOC of the respective cells, respectively.

11. The charging balancing method as claimed in claim 10, wherein the electric capacity variation look-up table includes a relationship between the dynamic battery inner-resistance point and a capacity of at least a discharging current amount.