CN108512262B - Energy storage battery management system and equalization method and device thereof - Google Patents

Energy storage battery management system and equalization method and device thereof Download PDF

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Publication number
CN108512262B
CN108512262B CN201710110969.8A CN201710110969A CN108512262B CN 108512262 B CN108512262 B CN 108512262B CN 201710110969 A CN201710110969 A CN 201710110969A CN 108512262 B CN108512262 B CN 108512262B
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electric quantity
energy storage
management system
storage battery
battery management
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CN108512262A (en
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李家德
刘祥
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Ningde Shidai Runzhi Software Technology Co.,Ltd.
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Contemporary Amperex Technology Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0016Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

The invention discloses a balancing method and a balancing device of an energy storage battery management system and the energy storage battery management system, wherein the method comprises the following steps: the method comprises the steps that battery parameters of each single battery in at least one battery module are collected, each battery module comprises a plurality of single batteries which are connected in series, and one or more single batteries which are connected in series are used as a power supply of an energy storage battery management system; and carrying out charge and discharge equalization on all the battery modules according to the battery parameters and an equalization strategy, wherein the equalization strategy is that the total electric quantity of the equalization discharge of all the battery modules is larger than the total electric quantity of the equalization charge of all the battery modules. Compared with the prior art, the battery energy storage system has the advantages that N single batteries connected in series are selected from the batteries of the battery energy storage system as a system power supply to supply power to circuit boards such as a battery management system, and meanwhile, the extra UPS cost is reduced by adjusting the balancing strategy. In addition, the battery cell capacity of the single battery is far larger than that of the battery cell of the UPS, so that the system power supply is more stable.

Description

Energy storage battery management system and equalization method and device thereof
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a balancing method and device of an energy storage battery management system and the energy storage battery management system.
Background
A large-scale battery energy storage system usually includes a plurality of series-connected battery modules, each of which is formed by connecting one or more battery cells in parallel. In a battery management system, battery modules are typically mounted in one or more battery cases.
The large-scale battery energy storage system is widely applied to the fields of wind and light power stations, company energy storage systems and the like.
The following disadvantages exist in the disclosed battery energy storage system:
in the existing large-scale battery energy storage System, circuit boards such as a battery management System need to Supply Power, and an independently used Uninterruptible Power Supply (UPS) is used as a System Power Supply to Supply Power to the circuit boards such as the battery management System. This adds an extra UPS cost and takes up additional space.
Disclosure of Invention
The invention aims to: the energy storage battery management system and the balancing method and device for the energy storage battery management system can reduce extra power supply sources.
In order to achieve the above object, the present invention provides an equalizing method for an energy storage battery management system, including:
collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and one or more single batteries connected in series are used as a power supply of the energy storage battery management system;
and performing charge and discharge equalization on all the battery modules according to the battery parameters and an equalization strategy, wherein the equalization strategy is that the total electric quantity of the equalization discharge of all the battery modules is larger than the total electric quantity of the equalization charge of all the battery modules.
As an improvement of the equalizing method of the energy storage battery management system of the present invention, the equalizing strategy is that the total equalized discharge electric quantity of all the battery modules is greater than the total equalized charge electric quantity of all the battery modules, and the difference between the total equalized discharge electric quantity and the total equalized charge electric quantity is greater than or equal to the working electric quantity of the energy storage battery management system.
As an improvement of the balancing method of the energy storage battery management system of the present invention, the balancing strategy further includes: and selecting M single batteries with the highest electric quantity from all the battery modules to perform balanced discharge, wherein M is an integer which is greater than or equal to the calculation result of the number of the discharged batteries, and the calculation result of the number of the discharged batteries is the working electric quantity of the energy storage battery management system divided by the balanced discharge electric quantity of the single batteries.
As an improvement of the balancing method for the energy storage battery management system of the present invention, the selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, where M is an integer greater than or equal to a calculation result of the number of discharged batteries, and the calculation result of the number of discharged batteries is a division of the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries specifically includes:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
As an improvement of the balancing method of the energy storage battery management system of the present invention, the number of the single batteries as the power supply of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
In order to achieve the above object, the present invention provides an equalizing device of an energy storage battery management system, including:
a battery parameter acquisition module for: collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and the plurality of single batteries connected in series are used as power supplies of the energy storage battery management system;
a balancing policy enforcement module to: and performing charge and discharge equalization on all the battery modules according to the battery parameters and an equalization strategy, wherein the equalization strategy is that the total electric quantity of the equalization discharge of all the battery modules is larger than the total electric quantity of the equalization charge of all the battery modules.
As an improvement of the equalizing device of the energy storage battery management system, the equalizing strategy is that the total equalizing-discharged electric quantity of all the battery modules is greater than the total equalizing-charged electric quantity of all the battery modules, and the difference between the total equalizing-discharged electric quantity and the total equalizing-charged electric quantity is greater than or equal to the working electric quantity of the energy storage battery management system.
As an improvement of the balancing apparatus of the energy storage battery management system of the present invention, the balancing strategy further includes: and selecting M single batteries with the highest electric quantity from all the battery modules to perform balanced discharge, wherein M is an integer which is greater than or equal to the calculation result of the number of the discharged batteries, and the calculation result of the number of the discharged batteries is the working electric quantity of the energy storage battery management system divided by the balanced discharge electric quantity of the single batteries.
As an improvement of the equalizing device of the energy storage battery management system of the present invention, the selecting M single batteries with the highest electric quantity from all the battery modules for equalizing discharge, where M is an integer greater than or equal to a calculation result of the number of discharged batteries, and the calculation result of the number of discharged batteries is a division of the working electric quantity of the energy storage battery management system by the equalizing discharge electric quantity of the single batteries specifically includes:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
As an improvement of the equalizing device of the energy storage battery management system of the present invention, the number of the single batteries as the power supply of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
In order to achieve the above object, the present invention provides an energy storage battery management system, including: the system comprises at least one slave machine, a master control module and power supply ends, wherein each slave machine balances a battery module formed by connecting at least one single battery in series, each slave machine is in communication connection with the master control module, the power supply ends are respectively and electrically connected with the master control module and the slave machines, and the output ends of a battery pack comprising one or more single batteries connected in series are electrically connected with the power supply ends.
Compared with the prior art, the balancing method and device of the energy storage battery management system and the energy storage battery management system have the following effects:
the battery energy storage system uses N strings of single batteries selected from the original batteries as a system power supply to supply power to circuit boards such as a battery management system, and simultaneously reduces extra UPS cost by adjusting a balance strategy. In addition, the battery cell capacity of the single battery is far larger than that of the battery cell of the UPS, so that the system power supply is more stable.
Drawings
The following describes in detail the balancing method and apparatus of the energy storage battery management system, and the beneficial effects thereof with reference to the accompanying drawings and the detailed description.
Fig. 1 is a flowchart illustrating an equalizing method of an energy storage battery management system according to the present invention.
Fig. 2 is a block diagram of an equalizing device of an energy storage battery management system according to the present invention.
Fig. 3 is a system block diagram of an energy storage battery management system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention is described in further detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a working flow chart of an equalizing method of an energy storage battery management system according to the present invention includes:
step S101, collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and one or more single batteries connected in series are used as a power supply of the energy storage battery management system;
and S102, performing charge-discharge balance on all the battery modules according to the battery parameters and a balance strategy, wherein the balance strategy is that the total electric quantity of the battery modules in balanced discharge is larger than the total electric quantity of the battery modules in balanced charge.
Specifically, one or more serially connected single batteries in a Battery module monitored by the energy storage Battery Management system are used as a power supply of the energy storage Battery Management system, and then, in step S101, Battery parameters are collected, and monitoring can be performed specifically through a main control module (BMU) and a slave computer (CSC) of the energy storage Battery Management system.
And step S102, performing charge and discharge equalization according to an equalization strategy, specifically, determining a strategy by the BMU, and notifying the corresponding CSC to perform charge and discharge equalization, where the equalization strategy can ensure that the total amount of charge of equalized discharge of all the battery modules is greater than the total amount of charge of equalized charge of all the battery modules, thereby providing power for the energy storage battery management system.
In an embodiment of the equalizing method of the energy storage battery management system according to the present invention, the equalizing strategy is that the total equalizing-discharged electric quantity of all the battery modules is greater than the total equalizing-charged electric quantity of all the battery modules, and the difference between the total equalizing-discharged electric quantity and the total equalizing-charged electric quantity is greater than or equal to the working electric quantity of the energy storage battery management system.
The equalization strategy of the embodiment ensures that enough equalized discharge electric quantity exists, so that enough working electric quantity is ensured to be provided for the energy storage battery management system.
In an embodiment of the balancing method of the energy storage battery management system of the present invention, the balancing policy further includes: and selecting M single batteries with the highest electric quantity from all the battery modules to perform balanced discharge, wherein M is an integer which is greater than or equal to the calculation result of the number of the discharged batteries, and the calculation result of the number of the discharged batteries is the working electric quantity of the energy storage battery management system divided by the balanced discharge electric quantity of the single batteries.
The embodiment calculates the number of the batteries for balanced discharge, and controls the batteries to perform balanced discharge, thereby ensuring that enough working electric quantity is provided for the energy storage battery management system.
In an embodiment of the equalizing method for the energy storage battery management system according to the present invention, the selecting M single batteries with the highest electric quantity from all the battery modules for equalizing discharge, where M is an integer greater than or equal to a calculation result of the number of discharged batteries, and the calculation result of the number of discharged batteries is a division of the working electric quantity of the energy storage battery management system by the equalizing discharge electric quantity of the single batteries specifically includes:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
For example:
if the energy storage battery management system consumes 12W and the balanced discharge electric quantity of the single battery is 3W, the calculation result of the number of discharged batteries is 4, and M is the calculation result of the number of discharged batteries, namely M is equal to 4;
if the energy storage battery management system consumes 12.3W and the balanced discharge electric quantity of the single battery is 3W, the calculation result of the number of the discharged batteries is 4.1, M is the integral part of the calculation result of the number of the discharged batteries plus one, namely M is equal to 5.
The embodiment selects the single batteries just enough for the energy storage battery management system to perform balanced discharge, thereby ensuring the overall balance of the system and ensuring the normal use of the energy storage battery management system.
In an embodiment of the balancing method for an energy storage battery management system according to the present invention, the number of the single batteries serving as the power supply of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
The embodiment can ensure that the total power supply after the single batteries serving as the power supply are connected in series meets the requirement of the working voltage of the energy storage battery management system.
Referring to fig. 2, a block diagram of an equalizing device of an energy storage battery management system according to the present invention includes:
a battery parameter acquisition module 201, configured to: collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and the plurality of single batteries connected in series are used as power supplies of the energy storage battery management system;
a balancing policy enforcement module 202 configured to: and performing charge and discharge equalization on all the battery modules according to the battery parameters and an equalization strategy, wherein the equalization strategy is that the total electric quantity of the equalization discharge of all the battery modules is larger than the total electric quantity of the equalization charge of all the battery modules.
In an embodiment of the equalizing device of the energy storage battery management system according to the present invention, the equalizing strategy is that the total equalizing-discharged electric quantity of all the battery modules is greater than the total equalizing-charged electric quantity of all the battery modules, and a difference between the total equalizing-discharged electric quantity and the total equalizing-charged electric quantity is greater than or equal to the operating electric quantity of the energy storage battery management system.
In an embodiment of the balancing apparatus of the energy storage battery management system of the present invention, the balancing policy further includes: and selecting M single batteries with the highest electric quantity from all the battery modules to perform balanced discharge, wherein M is an integer which is greater than or equal to the calculation result of the number of the discharged batteries, and the calculation result of the number of the discharged batteries is the working electric quantity of the energy storage battery management system divided by the balanced discharge electric quantity of the single batteries.
In an embodiment of the equalizing device of the energy storage battery management system of the present invention, the selecting M single batteries with the highest electric quantity from all the battery modules for equalizing discharge, where M is an integer greater than or equal to a calculation result of the number of discharged batteries, and the calculation result of the number of discharged batteries is a division of the operating electric quantity of the energy storage battery management system by the equalizing discharge electric quantity of the single batteries, specifically includes:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
In an embodiment of the equalizing device of the energy storage battery management system, the number of the single batteries serving as the power supply of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
Referring to fig. 3, a system block diagram of an energy storage battery management system according to the present invention includes: the system comprises at least one slave 1, a master control module 2 and power supply ends (not shown in the figure), wherein each slave 1 balances a battery module 3 formed by connecting at least one single battery 31 in series, each slave 1 is in communication connection with the master control module 2, the power supply ends are respectively and electrically connected with the master control module 2 and the slave 1, and the output ends of a group of battery packs 32 comprising one or more single batteries 31 in series are electrically connected with the power supply ends.
Referring to fig. 3, as a preferred embodiment of the present invention, an energy storage battery management system BMS includes a plurality of battery management modules and a main control module BMU 2. Each battery management module 4 includes a battery module 3 formed by connecting a plurality of battery cells Cell31 in series and a slave CSC 1. Both ends of the unit cell31 can be equalized by the equalizing DC/DC circuit of the slave 1. All the slave machines 1 of the battery management module are connected to the master control module 2 through communication lines. The slave 1 obtains voltage information of each single battery or battery unit in the battery management module through a wire harness, the voltage information is uploaded to the master control module 2 through a communication line, the master control module 2 is communicated with the slave 1 to collect information such as the whole electric quantity and voltage of each single battery, analyze and judge which single battery needs to be charged or discharged for balancing, and send an instruction through the communication line to enable the slave 1 to execute the instruction, namely, the slave 1 performs charge-discharge balancing.
Meanwhile, in the energy storage battery system, N single batteries 31 connected in series are selected to form a battery pack 32 as a system power supply, and the N value is determined according to the BMS power supply voltage requirement. For example, the system supply voltage is 24V, the single cell voltage is 3.2V, and N selects 8 single batteries connected in series.
And the balancing strategy ensures that the number of the total single batteries which are discharged in a balanced manner is more than M than the number of the charged single batteries, and the M value is determined according to the electric quantity which needs to be consumed by a system circuit board and the balanced discharging electric quantity of the single battery. For example, the system consumes 12W, and the balanced discharge electric quantity of a single battery is 3W, then M selects 4, so as to select the highest M serial single batteries for balanced discharge while ensuring that all the single batteries are balanced in electric quantity.
Compared with the prior art, the balancing method and device of the energy storage battery management system and the energy storage battery management system have the following effects:
the battery energy storage system uses N strings of single batteries selected from the original batteries as a system power supply to supply power to circuit boards such as a battery management system, and simultaneously reduces extra UPS cost by adjusting a balance strategy. In addition, the battery cell capacity of the single battery is far larger than that of the battery cell of the UPS, so that the system power supply is more stable.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (4)

1. An equalization method of an energy storage battery management system is characterized by comprising the following steps:
collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and one or more single batteries connected in series are used as a power supply of the energy storage battery management system;
performing charge-discharge equalization on all the battery modules according to an equalization strategy according to the battery parameters, wherein the equalization strategy is that the total electric quantity of equalization discharge of all the battery modules is larger than the total electric quantity of equalization charge of all the battery modules, and the difference value of the total electric quantity of equalization discharge and the total electric quantity of equalization charge is larger than or equal to the working electric quantity of the energy storage battery management system; the balancing strategy further comprises:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
2. The energy storage battery management system balancing method according to claim 1, wherein the number of the single batteries serving as the power supply of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
3. An equalizing device of an energy storage battery management system is characterized by comprising:
a battery parameter acquisition module for: collecting battery parameters of each single battery in at least one battery module, wherein each battery module comprises a plurality of single batteries connected in series, and the plurality of single batteries connected in series are used as power supplies of the energy storage battery management system;
a balancing policy enforcement module to: performing charge-discharge equalization on all the battery modules according to an equalization strategy according to the battery parameters, wherein the equalization strategy is that the total electric quantity of equalization discharge of all the battery modules is larger than the total electric quantity of equalization charge of all the battery modules, and the difference value of the total electric quantity of equalization discharge and the total electric quantity of equalization charge is larger than or equal to the working electric quantity of the energy storage battery management system; the balancing strategy further comprises:
if the number calculation result of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is an integer, M single batteries with the highest electric quantity are selected from all the battery modules for balanced discharge, wherein M is the number calculation result of the discharged batteries;
and if the calculation result of the number of discharged batteries obtained by dividing the working electric quantity of the energy storage battery management system by the balanced discharge electric quantity of the single batteries is not an integer, selecting M single batteries with the highest electric quantity from all the battery modules for balanced discharge, wherein M is the integer part of the calculation result of the number of discharged batteries plus one.
4. The equalizing device of the energy storage battery management system according to claim 3, wherein the number of the single batteries serving as the power supply sources of the energy storage battery management system is greater than or equal to the operating voltage of the energy storage battery management system divided by the operating voltage of the single batteries.
CN201710110969.8A 2017-02-28 2017-02-28 Energy storage battery management system and equalization method and device thereof Active CN108512262B (en)

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