CN103414224B - A kind of high-tension integrated battery group system of Large Copacity and control method thereof - Google Patents

A kind of high-tension integrated battery group system of Large Copacity and control method thereof Download PDF

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Publication number
CN103414224B
CN103414224B CN201310351812.6A CN201310351812A CN103414224B CN 103414224 B CN103414224 B CN 103414224B CN 201310351812 A CN201310351812 A CN 201310351812A CN 103414224 B CN103414224 B CN 103414224B
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control unit
integrated battery
main control
battery
bcu
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CN201310351812.6A
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Chinese (zh)
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CN103414224A (en
Inventor
刘飞
文锋
阮旭松
揭毅
谭景星
郑党伟
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惠州市亿能电子有限公司
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Abstract

The present invention relates to the high-tension integrated battery group system of a kind of Large Copacity and control method thereof.Described system adopts two-stage battery management system control mode, and be each integrated battery group design current-limiting resistance loop and main control loop, battery management system is controlled separately each integrated battery group, efficiently solve integrated battery group in parallel time due to the problem of the huge circulation of unbalanced easy generation between each battery pack, make the application of high capacity cell become possibility.Because each integrated battery group is furnished with corresponding a set of battery management system as one-level control section, carry out equilibrium to the battery exceeding threshold voltage, each integrated battery group can carry out equalization operation separately, controls flexible.

Description

A kind of high-tension integrated battery group system of Large Copacity and control method thereof

Technical field

The present invention relates to the battery system control field of high voltage large capcity.

Background technology

A lot of car load factory is at research and development electric bus at present, and the volume of electric bus own is large, load-carrying is many, and this just requires that the battery pack as power source can provide high voltage, jumbo electricity.For reaching this object, needing first to cell parallel connection, its capacity to be expanded, then parallel connection battery in groups being connected, to improve its voltage.Due to the inconsistency of lithium battery monomer, cause the inconsistent of the battery cell voltage in groups, capacity, connect by this kind, namely can cause the generation of huge circulation, cause badly damaged to lithium battery and electronic device wherein.

Summary of the invention

For the problems referred to above, the present invention proposes the high-tension integrated battery group system of a kind of Large Copacity and control method thereof.

Large Copacity of the present invention high-tension integrated battery group system comprises multiple integrated battery group parallel with one another, all arranges one-level battery management system in each integrated battery group.Described one-level battery management system comprises major loop control circuit and current limliting loop control circuit in group in control unit (BMU), main control unit (BCU), high voltage unit (HMU) and group.Wherein, from control unit (BMU) for monomer battery voltage detection, temperature acquisition, Balance route, and the battery status information gathered is sent to main control unit (BCU); High voltage unit (HMU) for current detecting, discharge and recharge ampere-hour is accumulative, total voltage detects, battery case state of insulation detects, and the data of collection are sent to main control unit (BCU); Main control unit (BCU) is collected from the data controlling unit (BMU) and high voltage unit (HMU) and is carried out battery pack SOC estimation, fault alarm, thermal field management, Charge Management; The main control unit (BCU) of each integrated battery group connects senior high voltage unit and senior main control unit jointly by CAN.

In group, major loop control circuit comprises the first switching device be series on the total input and output circuit of integrated battery group, and this switching device is controlled by the main control unit (BCU) of one-level battery management system; In group, current limliting loop control circuit comprises current-limiting resistance and second switch device, in parallel with the first switching device after described current-limiting resistance and second switch devices in series.

Based on the high-tension integrated battery group system of above-mentioned Large Copacity, the present invention also provides the control method of this system.Described control method comprises charging process and controls and discharge process control.

Described charging process controls as follows: described charging process control is, after powering on, the detecting battery status information from control unit (BMU) and send to corresponding main control unit (BCU) to be uploaded to senior main control unit by main control unit (BCU) of each integrated battery group; Senior main control unit finds out the minimum integrated battery group of total voltage by comparative analysis, and sends instructions under the main control unit (BCU) of the minimum integrated battery group of total voltage; After the main control unit (BCU) of this integrated battery group receives instruction, control this integrated battery group and first carry out current limliting precharge process, until the pressure reduction at second switch device two ends in current limliting loop control circuit after being greater than setting threshold again the device that goes into operation of first in closed major loop control circuit disconnect second switch device, charge normal.

Senior main control unit continues com-parison and analysis each integrated battery group voltage in remaining battery pack, and detect busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, also carries out current limliting precharge process until this integrated battery group and bus pressure reduction reach within the scope of setting threshold charges normal this integrated battery group again; For total voltage and busbar voltage difference setting the integrated battery group in threshold range, senior main control unit sends out incoming instruction to main control unit in group, in group, main control unit controls closed first switching device, second switch device disconnects, this integrated battery group is access charging system in parallel directly, charges normal.

Described discharge process controls, after powering on, and the detecting battery status information from control unit (BMU) and send to corresponding main control unit (BCU) to be uploaded to senior main control unit by main control unit (BCU) of each integrated battery group; Senior main control unit finds out the highest integrated battery group of total voltage by comparative analysis, and sends instructions under the main control unit (BCU) of the highest integrated battery group of total voltage; After the main control unit (BCU) of this integrated battery group receives instruction, control this integrated battery group and close the device that goes into operation of first in major loop control circuit and disconnect second switch device and carry out pre-arcing process.

Senior main control unit continues com-parison and analysis in remaining integrated battery group, and detect busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, then controls this integrated battery group and first carry out current limliting precharge process until its total voltage and busbar voltage difference reach sets in threshold range; Be less than for integrated battery group total voltage and busbar voltage difference the integrated battery group setting threshold values, then in control group, main control unit (BCU) controls closed main first switching device disconnection second switch device, and this integrated battery group is access discharge system in parallel directly.

Compared with prior art, beneficial effect of the present invention is: the present invention adopts two-stage battery management system control mode, for each integrated battery group design current-limiting resistance loop and main control loop, battery management system is controlled separately each integrated battery group, efficiently solve integrated battery group in parallel time due to the problem of the huge circulation of unbalanced easy generation between each battery pack, make the application of high capacity cell become possibility.Because each integrated battery group is furnished with corresponding a set of battery management system as one-level control section, carry out equilibrium to the battery exceeding threshold voltage, each integrated battery group can carry out equalization operation separately, controls flexible.

Accompanying drawing explanation

Fig. 1 is integrated battery group system structural topology figure of the present invention;

Fig. 2 is described control method charging control process schematic flow sheet;

Fig. 3 is described control method control of discharge process flow schematic diagram.

Embodiment

For the ease of the understanding of those skilled in the art, below in conjunction with drawings and Examples, the present invention is described in further detail:

In battery Large Copacity, high voltage applications occasion, cell is rear series connection in parallel first, meets the requirements of battery capacity and voltage request, forms integrated battery group.In high voltage application scenarios such as electric bus, several this integrated battery group parallel connection is also needed to use, as shown in Figure 1.The needs of the present invention in order to control, access a battery management system as first order battery management system in each integrated battery group, then the control system that the power-supply system whole installation one used afterwards whole parallel connection is total.In addition, in each integrated battery group, a major loop control circuit and a current limliting loop control circuit are also set respectively.Major loop control circuit comprises the relay K be series on the total input and output circuit of integrated battery group, and relay K is controlled by the main control unit of one-level battery management system; Current limliting loop control circuit comprises current-limiting resistance R and relay J, and current-limiting resistance R and relay J are in parallel with relay K after connecting.

The first order battery management system of corresponding each integrated battery group generally comprises from main control unit BCU in control unit B MU, group and group inner high voltage unit HMU in group, and three is connected by CAN.Wherein, BMU monomeric charge battery voltage acquisition, temperature acquisition, Balance route and the battery status information collection send to BCU.HMU is responsible for current detecting, discharge and recharge ampere-hour is accumulative, total voltage detects, battery case state of insulation detects, and the data of collection are sent to BCU.BCU collects the data of BMU and HMU and carries out battery pack SOC estimation, fault alarm, thermal field management, Charge Management.

Controlled by a total control circuit after the parallel connection of some integrated battery groups, as the second level control section of system, second level control section comprises a senior main control unit BCU, a senior high voltage unit HMU and several shunts A.The main control unit BCU of each integrated battery group connects senior high voltage unit and senior main control unit BCU jointly by CAN.The BCU of second level control section is the highest control section of whole battery system, and priority is the highest, controls whole battery system.

Large Copacity of the present invention high-tension integrated battery group system charging process controlling method as shown in Figure 2.After powering on, the detecting battery status information from control unit B MU and send to corresponding main control unit BCU to be uploaded to senior main control unit by main control unit BCU of each integrated battery group; Senior main control unit finds out the minimum integrated battery group of total voltage by comparative analysis, and send instructions under the main control unit BCU of the minimum integrated battery group of total voltage, after the main control unit BCU of this integrated battery group receives instruction, control the advanced line precharge process of this integrated battery group, namely relay K disconnects, relay J closes, and charging current is first charged to integrated battery resistance slowly by current-limiting resistance R.After the voltage difference at relay J two ends is less than setting threshold voltage, the main control unit BCU of this integrated battery group controls closing relay K, disconnects relay J, in this integrated battery group access charging system.

Senior main control unit continues com-parison and analysis total voltage in remaining battery pack, and detect busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, above-mentioned same method is adopted to carry out current limliting precharge process, until threshold value is accessed charging system after reaching setting range again; The integrated battery group setting threshold values is less than for total voltage and busbar voltage difference, senior main control unit sends out incoming instruction to main control unit in group, in group, main control unit controls the first switching device that closed pair is answered, disconnect corresponding second switch device, by this integrated battery group directly access charging system in parallel.

In charging control process, senior main control unit and from control unit composition the state of system to each integrated battery group detect in real time, if there is catastrophe failure in the integrated battery group be incorporated to, when need cut off this integrated battery group high pressure, in group, main control unit BCU gives electric instruction from control unit B MU in group, send out the signal of telecommunication permission from main control unit BCU in backward group of control unit B MU stopping charging in organizing, carry out high pressure cut-off operation.

Described discharge process controls as shown in Figure 3, after powering on, and the detecting battery status information from control unit B MU and send to corresponding main control unit BCU to be uploaded to senior main control unit by main control unit BCU of each integrated battery group; Senior main control unit finds out the highest integrated battery group of total voltage by comparative analysis, and sends instructions under the main control unit BCU of the highest integrated battery group of total voltage; After the main control unit BCU of this integrated battery group receives instruction, control this integrated battery group and first access discharge system and carry out pre-arcing process, namely relay J disconnects, relay K closes, this integrated battery group directly accesses discharge system, and now, other integrated battery group does not access discharge system.Senior main control unit continues the total voltage of other integrated battery group of com-parison and analysis in remaining integrated battery group, and detect electric discharge busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, after first carrying out pre-arcing process, accesses discharge system again.Namely control second switch device corresponding to this integrated battery group to close, the first corresponding switching device disconnects, with other battery pack electric energy first for this battery pack carries out current-limiting charge, set in threshold range until its total voltage and busbar voltage difference reach, disconnect second switch device again, closed first switching device, accesses discharge system by battery pack.The integrated battery group setting threshold values is less than for integrated battery group total voltage and busbar voltage difference, senior main control unit sends out incoming instruction to main control unit BCU, in group, main control unit BCU controls closed main first switching device, and this integrated battery group is access discharge system in parallel directly.

The state of each integrated battery group is detected in real time in described control of discharge process, if there is catastrophe failure in the integrated battery group be incorporated to, when need cut off this integrated battery group high pressure, in group, main control unit BCU gives electric instruction from control unit B MU in group, send out the signal of telecommunication permission from main control unit BCU in backward group of control unit B MU stopping electric discharge in organizing, carry out high pressure cut-off operation.

The above embodiment only have expressed embodiments of the present invention; it describes comparatively concrete and detailed; but therefore can not be interpreted as the restriction to the scope of the claims of the present invention; in every case the technical scheme that the form of equivalent replacement or equivalent transformation obtains is adopted, all should within protection scope of the present invention.

Claims (3)

1. Large Copacity high-tension integrated battery group system control method, comprise the high-tension integrated battery group system of Large Copacity, described integrated battery group is parallel with one another, all arrange one-level battery management system in each integrated battery group, described one-level battery management system comprises major loop control circuit and current limliting loop control circuit in group in control unit (BMU), main control unit (BCU), high voltage unit (HMU) and group; Wherein,
From control unit (BMU) for monomer battery voltage detection, temperature acquisition, Balance route, and the battery status information gathered is sent to main control unit (BCU);
High voltage unit (HMU) for current detecting, discharge and recharge ampere-hour is accumulative, total voltage detects, battery case state of insulation detects, and the data of collection are sent to main control unit (BCU);
Main control unit (BCU) is collected from the data controlling unit (BMU) and high voltage unit (HMU) and is carried out battery pack SOC estimation, fault alarm, thermal field management, Charge Management;
The main control unit (BCU) of each integrated battery group connects senior high voltage unit and senior main control unit jointly by CAN;
In group, major loop control circuit comprises the first switching device be series on the total input and output circuit of integrated battery group, and this switching device is controlled by the main control unit (BCU) of one-level battery management system;
In group, current limliting loop control circuit comprises current-limiting resistance and second switch device, in parallel with the first switching device after described current-limiting resistance and second switch devices in series, it is characterized in that, described Large Copacity high-tension integrated battery group system control method also comprises charging process and controls and discharge process control;
Described charging process controls, after powering on, and the detecting battery status information from control unit (BMU) and send to corresponding main control unit (BCU) to be uploaded to senior main control unit by main control unit (BCU) of each integrated battery group; Senior main control unit finds out the minimum integrated battery group of total voltage by comparative analysis, and sends instructions under the main control unit (BCU) of the minimum integrated battery group of total voltage; After the main control unit (BCU) of this integrated battery group receives instruction, control this integrated battery group and first carry out current limliting precharge process, until after the voltage difference at second switch device two ends in current limliting loop control circuit is less than setting threshold, the first switching device again in closed major loop control circuit disconnects second switch device, charges normal;
Senior main control unit continues com-parison and analysis each integrated battery group voltage in remaining battery pack, and detect busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, also carry out current limliting precharge process until this integrated battery group and bus pressure reduction reach within the scope of setting threshold, then this integrated battery group is charged normal; For total voltage and busbar voltage difference setting the integrated battery group in threshold range, senior main control unit sends out incoming instruction to main control unit in group, in group, main control unit controls closed first switching device, second switch device disconnects, this integrated battery group is access charging system in parallel directly, charges normal;
Described discharge process controls, after powering on, and the detecting battery status information from control unit (BMU) and send to corresponding main control unit (BCU) to be uploaded to senior main control unit by main control unit (BCU) of each integrated battery group; Senior main control unit finds out the highest integrated battery group of total voltage by comparative analysis, and sends instructions under the main control unit (BCU) of the highest integrated battery group of total voltage; After the main control unit (BCU) of this integrated battery group receives instruction, control this integrated battery group and close the first switching device in major loop control circuit, disconnect second switch device and discharge;
Senior main control unit continues com-parison and analysis in remaining integrated battery group, and detect busbar voltage, the integrated battery group setting threshold values is greater than for total voltage and busbar voltage difference, then control this integrated battery group and first carry out current limliting precharge process, set in threshold range until its total voltage and busbar voltage difference reach; Be less than for integrated battery group total voltage and busbar voltage difference the integrated battery group setting threshold values, then main control unit (BCU) directly closed first switching device in control group, disconnects second switch device, by this integrated battery group directly access discharge system in parallel.
2. Large Copacity high-tension integrated battery group system control method as claimed in claim 1, it is characterized in that: the state detecting each integrated battery group in described charging control process in real time, if there is catastrophe failure in the integrated battery group be incorporated to, when need cut off this integrated battery group high pressure, in group, main control unit (BCU) gives electric instruction from control unit (BMU) in group, group is interior sends out the signal of telecommunication permission from main control unit (BCU) in backward group of control unit (BMU) stopping charging, carries out high pressure cut-off operation.
3. Large Copacity high-tension integrated battery group system control method as claimed in claim 1, it is characterized in that: the state detecting each integrated battery group in described control of discharge process in real time, if there is catastrophe failure in the integrated battery group be incorporated to, when need cut off this integrated battery group high pressure, in group, main control unit (BCU) gives electric instruction from control unit (BMU) in group, group is interior sends out the signal of telecommunication permission from main control unit (BCU) in backward group of control unit (BMU) stopping electric discharge, carries out high pressure cut-off operation.
CN201310351812.6A 2013-08-14 2013-08-14 A kind of high-tension integrated battery group system of Large Copacity and control method thereof CN103414224B (en)

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