CN110854980A - Intelligent battery power module applied to distributed energy storage system - Google Patents

Intelligent battery power module applied to distributed energy storage system Download PDF

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Publication number
CN110854980A
CN110854980A CN201810951338.3A CN201810951338A CN110854980A CN 110854980 A CN110854980 A CN 110854980A CN 201810951338 A CN201810951338 A CN 201810951338A CN 110854980 A CN110854980 A CN 110854980A
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China
Prior art keywords
battery
power module
module
battery power
voltage
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Pending
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CN201810951338.3A
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Chinese (zh)
Inventor
梁建钢
王作兴
童亦斌
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Beijing Deyi New Energy Technology Co Ltd
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Beijing Deyi New Energy Technology Co Ltd
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Priority to CN201810951338.3A priority Critical patent/CN110854980A/en
Publication of CN110854980A publication Critical patent/CN110854980A/en
Pending legal-status Critical Current

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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
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

An intelligent battery power module applied to a distributed energy storage system is suitable for application occasions of the energy storage system with high safety and high dispersity, such as a user side and building combination, and adopts a design scheme of integrating a battery module, isolation transformation, battery management, protection and intellectualization. The battery module in the intelligent battery power module adopts a low-voltage and small-capacity design mode, the voltage level is 48Vdc, and the capacity is about 5-10 kWh; the isolation converter in the intelligent battery power module has a boosting function and also has a charge-discharge control function on the battery module; the controller in the intelligent battery power module has the functions of single voltage acquisition, module temperature acquisition, quick plug connector temperature acquisition, isolation converter voltage and current acquisition, converter drive control and external RS485 and CAN communication. The intelligent battery power module outputs voltage 375Vdc, supports alternating current and direct current application occasions, supports two direct current voltage levels of 375Vdc and 750Vdc, and meets the requirement of future direct current power supply.

Description

Intelligent battery power module applied to distributed energy storage system
Technical Field
The invention relates to the field of energy storage application, in particular to the field of distributed energy storage applied to a building by a user side.
Background
With the continuous development of new energy technologies such as wind power generation, photovoltaic power generation and the like, more and more power generation units with poor adjustability are connected in a power grid in a high-penetration mode, the power generation side is more and more rigid, and the adjustability is more and more poor; in the future, the proportion of energy consumption of buildings and traffic on the electricity utilization side is higher and higher, the behavior characteristics of the two electricity utilization receivers are large, the electricity utilization side is more and more rigid, and the adjustability is more and more poor. The rigidity and the non-adjustability of the power generation side and the power utilization side bring great challenges to the balance of supply and demand of a power grid, and the key point for solving the problem is to add energy storage facilities in the power grid so as to decouple the power generation side and the power utilization side, wherein currently, the frequency modulation of the power generation side, the peak modulation of the power transmission side and the peak clipping and valley filling of the user side are all used for solving the problem, and the addition of an energy storage system on the user side is the most efficient and direct way for solving the problem.
With the development of the related industries such as the electric automobile industry, an electrochemical energy storage system using a lithium ion battery as an energy storage element is a main choice of the current energy storage system. Different from the power generation side and the power transmission side, the user side has higher requirements on the safety of the energy storage system and the like due to the characteristic of tight combination with people and buildings, and has no written fire control acceptance standard about the energy storage system so far, so that the development of the energy storage system is further hindered. The user side, especially the place where the user side uses electricity of a large user, is also the area with dense pedestrian flow inevitably, besides the safety, the spatial position, the universality, the intellectualization and the like are all the problems that the energy storage system at the user side needs to be mainly considered and solved, in addition, the direct current power supply mode at the power distribution side and the user side is more and more universal, and the energy storage system at the user side can meet the related requirements. This is also the background proposed by the present intelligent battery power module applied to a distributed energy storage system.
Disclosure of Invention
The invention provides an intelligent battery power module applied to a distributed energy storage system, which aims to solve the problems of safety, space, customization and the like caused by application of a lithium ion battery energy storage system on a user side and simultaneously considers the intellectualization of the energy storage system and the requirement of adapting to future direct current power supply. Adopt low pressure, low capacity battery module, adopt isolation converter to keep apart each other between the battery module, adopt and integrate battery module, isolation converter unit, battery management unit, protection unit and intelligent unit in the design of an organic whole, support interchange and direct current application occasion to support two kinds of direct current voltage grades of 375Vdc and 750Vdc, satisfy the demand of future direct current power supply.
Technical scheme
The invention discloses an intelligent battery power module applied to a distributed energy storage system, which is a battery power module integrating battery module, isolation transformation, battery management, protection and intellectualization and capable of being connected in series and in parallel externally, and is shown in figure 1.
The invention relates to an intelligent battery power module applied to a distributed energy storage system, wherein an internal battery module of the intelligent battery power module adopts a lithium iron phosphate battery (which can be an electric automobile retired battery) and adopts a 1-parallel 16-series or multi-parallel 16-series mode, the capacity of a single monomer or a monomer battery after parallel connection is 100-200 Ah, and the capacity of the battery module is about 5-10 kWh.
The invention relates to an intelligent battery power module applied to a distributed energy storage system, which comprises a fuse protector, a direct current circuit breaker and other protection devices, wherein the fuse protector is arranged between 2 batteries with 8 strings, and the direct current circuit breaker is arranged on the positive electrode and the negative electrode of a battery module.
The hardware topology of the DC/DC converter in the intelligent battery power module applied to the distributed energy storage system adopts a full-bridge isolation LLC topology, the voltage of a low-voltage side (battery module side) is nominally 48Vdc, the voltage of a high-voltage side (external connection side) is nominally 375V, the rated power is 2.5kW, and the intelligent battery power module has the functions of soft start and the like.
The intelligent battery power module applied to the distributed energy storage system is externally connected with a DC + and DC-main circuit terminal, a CAN and RS485 communication terminal, adopts a quick plug design mode, reserves a maintenance interface and supports a battery module in the intelligent battery power module to perform external maintenance according to requirements.
The invention discloses an intelligent battery power module auxiliary power supply applied to a distributed energy storage system, which adopts a form of common power supply of a low-voltage battery module and a high-voltage bus, a controller integrates the functions of battery management, intelligent control, communication management and the like, acquires the voltage of each battery monomer, acquires the temperature of the battery module, acquires the temperature of a quick plug-in main circuit output terminal, acquires information such as the voltage and the current of a DC/DC converter and performs battery state estimation and DC/DC converter drive control.
The intelligent battery power module applied to the distributed energy storage system supports parallel 375Vdc operation and serial 750Vdc operation, and can realize the automatic voltage-sharing control function of the intelligent battery power module in the serial operation process, as shown in fig. 2.
Advantageous effects
The scheme that low-voltage and small-capacity battery modules are distributed is adopted in an intelligent battery power module applied to a distributed energy storage system, and the requirements of a user side energy storage system on safety, arrangement and the like are met in the aspects of voltage level, unit energy, space requirements and the like.
Different from the mode that battery monomers of 200-250 batteries of the traditional energy storage system are connected in series to a very high voltage, the intelligent battery power module applied to the distributed energy storage system is not directly connected in series and in parallel through battery modules, but is connected in series and in parallel through an internal DC/DC converter (adopting an isolation topology), the battery modules are isolated from each other through the DC/DC converter, and a fault spreading channel after the battery modules are in problems is blocked.
The intelligent battery power module applied to the distributed energy storage system supports series-parallel combination, alternating current and direct current application and supports two voltage levels of 375Vdc and 750 Vdc. .
Drawings
Fig. 1 is a system diagram of a smart battery power module.
Fig. 2 is a series-parallel connection diagram of smart battery power modules.
In FIG. 1
The DC/DC converter is an internal isolation converter of the intelligent battery power module;
the DC + is an external connection positive terminal of the intelligent battery power module;
the DC-is that the intelligent battery power module is externally connected with a negative terminal;
RS485 and CAN are external communication terminals of the intelligent battery power module;
in FIG. 2
+375V is a bipolar direct current bus positive bus;
0V is a bipolar direct current bus zero bus;
and-375V is a bipolar direct current bus negative bus.
Detailed Description
As shown in fig. 1, the intelligent battery power module includes a battery module, a DC/DC converter and a controller, and is connected via a primary circuit and a secondary circuit, and all connection cables are high-temperature cables.
The battery module adopts the lithium iron phosphate battery (can be the electric automobile retired battery), contains 16 battery monomer (adopting 1 and 16 strings or 16 strings of parallel form), divides 2 groups 8 strings of forms, connects through the fuse between 2 groups 8 strings of batteries, and battery module voltage is nominally 48Vdc, and single monomer or parallelly connected back monomer battery capacity 100~200Ah, battery module capacity are about 5kWh ~10 kWh.
The DC/DC converter adopts a full-bridge isolation LLC circuit topology, a soft start device is additionally arranged on a high-voltage side, the power is 2.5kW, a low-voltage side is connected with a battery module through a direct-current breaker, the nominal voltage is 48Vdc (supporting 45V to 56V), the high-voltage side is externally connected, and the nominal voltage is 375V.
The controller mainly realizes the functions of battery management, intelligent control, communication management and the like, collects the voltage of a single battery, collects the temperature of a battery module, collects the voltage of the low-voltage side of the DC/DC converter, collects the current of the low-voltage side of the DC/DC converter, collects the voltage of the high-voltage side of the DC/DC converter, collects the current of the isolation resonance side of the DC/DC converter, collects the temperature of an externally-connected quick-plugging terminal of the intelligent battery module, judges the SOC, the SOE, the SOP and the SOH of the battery according to the collected information, drives the action of a switching device in the DC/DC converter according to the collected information and an upper computer instruction of each part of the DC/DC converter and controls the charging and discharging of the DC/DC converter based on an internal control strategy.
As shown in fig. 1, the external connection of the smart battery power module includes two parts, namely a main circuit connection and a communication connection, wherein the main circuit includes two terminals, namely a DC + terminal and a DC-terminal, and the communication connection includes two modes, namely a CAN mode and an RS485 mode, and is integrated on one communication terminal. No matter the main circuit terminal or the communication terminal adopts a bolt-free quick plug-pull terminal form. And a maintenance interface is reserved in the intelligent battery power module, and the external maintenance of the battery module in the intelligent battery power module is supported according to the requirement.
As shown in fig. 2, the intelligent battery power modules support series-parallel combination, the output voltage of the intelligent battery power modules is 375V, the 375V dc bus can be connected, two intelligent battery power modules can be connected in series with 750V dc bus, and the intelligent battery power modules connected in series with 750V dc bus can automatically realize voltage-sharing control.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides an intelligent battery power module for distributed energy storage system which characterized in that: the intelligent battery power module integrates lithium ion battery module, isolation transformation, battery management, protection and intellectualization, and is externally represented as a series-parallel intelligent battery power module.
2. The smart battery power module of claim 1, wherein: the internal battery module adopts a lithium iron phosphate battery (which can be an electric automobile retired battery) and adopts a 1-parallel 16-series or multi-parallel 16-series mode, the capacity of a single battery or a single battery after parallel connection is 100-200 Ah, and the capacity of the battery module is about 5-10 kWh.
3. The smart battery power module of claim 1, wherein: the internal protection includes devices such as fuse and direct current circuit breaker, and wherein the fuse is arranged between 2 8 monomer batteries of cluster, and direct current circuit breaker arranges in the positive negative pole of battery module.
4. The smart battery power module of claim 1, wherein: the internal DC/DC converter hardware topology adopts a full-bridge isolation LLC topology, the battery module side voltage is nominally 48Vdc, the external connection side voltage is nominally 375V, the rated power is 2.5kW, and the internal DC/DC converter hardware topology has the functions of soft start and the like.
5. The smart battery power module of claim 1, wherein: the external connection comprises a DC + and DC-main circuit output terminal, a CAN and RS485 communication terminal, a quick plugging design mode is adopted, a maintenance interface is reserved, and the battery module in the intelligent battery power module is supported to be maintained as required.
6. The smart battery power module of claim 1, wherein: the internal auxiliary power supply adopts a common power supply form of a low-voltage battery module and a high-voltage bus, the controller integrates the functions of battery management, intelligent control, communication management and the like, acquires the voltage of each battery monomer, acquires the temperature of the battery module, acquires the temperature of the output terminal of the fast plug-in main circuit, acquires the voltage and current and other information of the DC/DC converter, and performs battery state estimation and DC/DC converter drive control.
7. The smart battery power module of claim 5, wherein: the parallel 375Vdc operation and the serial 750Vdc operation are supported, and the automatic voltage-sharing control function of the intelligent battery power module can be realized in the serial operation process.
CN201810951338.3A 2018-08-21 2018-08-21 Intelligent battery power module applied to distributed energy storage system Pending CN110854980A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112366795A (en) * 2020-12-01 2021-02-12 上海交通大学 Power electronic intelligent battery unit
CN112677906A (en) * 2020-12-22 2021-04-20 浙江吉利控股集团有限公司 Battery system, control method and vehicle
CN112886620A (en) * 2021-02-02 2021-06-01 南京大全电子科技有限公司 Power energy module and power converter based on energy storage element
CN115963740A (en) * 2023-01-30 2023-04-14 中南大学 Energy storage type high-speed heavy-load train and rolling test system thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203377670U (en) * 2013-07-25 2014-01-01 湖北省电力勘测设计院 Distributed intelligent direct current power supply
CN106505730A (en) * 2016-12-30 2017-03-15 北京知行新能科技有限公司 Battery powered managing system
CN206323146U (en) * 2016-12-08 2017-07-11 珠海清英加德智能装备有限公司 A kind of battery energy storage system
CN107431373A (en) * 2015-04-03 2017-12-01 施耐德电气It公司 Adaptive battery group
CN108258810A (en) * 2016-12-28 2018-07-06 比亚迪股份有限公司 Direct current photovoltaic energy-storage system and its control method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203377670U (en) * 2013-07-25 2014-01-01 湖北省电力勘测设计院 Distributed intelligent direct current power supply
CN107431373A (en) * 2015-04-03 2017-12-01 施耐德电气It公司 Adaptive battery group
CN206323146U (en) * 2016-12-08 2017-07-11 珠海清英加德智能装备有限公司 A kind of battery energy storage system
CN108258810A (en) * 2016-12-28 2018-07-06 比亚迪股份有限公司 Direct current photovoltaic energy-storage system and its control method
CN106505730A (en) * 2016-12-30 2017-03-15 北京知行新能科技有限公司 Battery powered managing system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112366795A (en) * 2020-12-01 2021-02-12 上海交通大学 Power electronic intelligent battery unit
CN112366795B (en) * 2020-12-01 2022-12-09 上海交通大学 Power electronic intelligent battery unit
CN112677906A (en) * 2020-12-22 2021-04-20 浙江吉利控股集团有限公司 Battery system, control method and vehicle
CN112886620A (en) * 2021-02-02 2021-06-01 南京大全电子科技有限公司 Power energy module and power converter based on energy storage element
CN115963740A (en) * 2023-01-30 2023-04-14 中南大学 Energy storage type high-speed heavy-load train and rolling test system thereof
CN115963740B (en) * 2023-01-30 2024-01-30 中南大学 Energy-storage type high-speed and heavy-load train and rolling test system thereof

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