CN214929039U - Energy storage charging and battery replacing system - Google Patents

Energy storage charging and battery replacing system Download PDF

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Publication number
CN214929039U
CN214929039U CN202121220465.XU CN202121220465U CN214929039U CN 214929039 U CN214929039 U CN 214929039U CN 202121220465 U CN202121220465 U CN 202121220465U CN 214929039 U CN214929039 U CN 214929039U
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energy storage
battery
switch
storage battery
unit
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Chinese (zh)
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张华建
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Zhejiang Ying Fei Amperex Technology Ltd
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Zhejiang Ying Fei Amperex Technology Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses energy storage charging trades electric system, the first switch unit who is connected with the electric wire netting, the voltage conversion unit who is connected with first switch unit, the second switch unit who is connected with voltage conversion unit, energy storage battery and the power battery who is connected with second switch unit respectively, the control unit who is connected with first switch unit and second switch unit respectively. Because the energy storage battery and the power battery are connected through the voltage conversion unit, in the process that the energy storage battery charges the power battery, the voltage conversion unit can realize energy conversion between the energy storage battery and the power battery through one-time energy conversion, the charging efficiency of the energy storage charging and battery replacing system is improved, and the use cost and the use space of the energy storage charging and battery replacing system are reduced.

Description

Energy storage charging and battery replacing system
Technical Field
The application relates to the technical field of power electronics, in particular to an energy storage charging and battery replacing system.
Background
With the development of science and technology, new energy electric vehicles are becoming the key points of the automobile industry and energy development gradually as a model for the use of clean energy, and also becoming more important components in human daily life gradually.
In the conventional energy storage charging and converting system, an energy storage battery and a power battery are both connected to a direct current bus, and in order to ensure the stability of the voltage of the direct current bus, the voltage of the direct current bus is constant, so that in the process of charging the power battery from the energy storage battery, a multi-stage DC/DC conversion unit (for example, after the energy storage battery is connected with the bidirectional DC/DC conversion unit, the bidirectional DC/DC conversion unit is connected with the direct current bus, and after the direct current bus is connected with the DC/DC conversion unit, the DC/DC conversion unit is connected with the power battery) is needed, so as to meet the requirement of matching the output voltage of the energy storage battery with the charging requirement of the power battery. Because the energy storage battery and the power battery need to be connected through the direct current bus, when the energy storage battery charges to a plurality of power batteries, energy conversion needs to be carried out for many times, the charging efficiency of the energy storage charging and battery replacing system is reduced, and the use cost and the use space are increased. In addition, the charging and replacing system cannot supply power to the new energy electric vehicle according to the peak-to-valley power rule, so that the power battery is often supplied power in the peak power time period, and the power consumption cost is high.
Therefore, it is obvious that how to improve the charging efficiency of the energy storage charging and battery replacing system and reduce the use cost and the use space of the energy storage charging and battery replacing system is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an energy storage charging and battery replacing system, which is used for improving the charging efficiency of the energy storage charging and battery replacing system and reducing the use cost and the use space of the energy storage charging and battery replacing system.
In order to solve the above technical problem, the present application provides an energy storage charging and battery replacing system, including: the system comprises a first switch unit connected with a power grid, a voltage conversion unit connected with the first switch unit, a second switch unit connected with the voltage conversion unit, an energy storage battery and a power battery which are respectively connected with the second switch unit, and a control unit respectively connected with the first switch unit and the second switch unit;
the control unit is used for controlling the first switch unit and the second switch unit in a first preset time period to enable a power grid to charge the energy storage battery through the voltage conversion unit, and controlling the first switch unit and the second switch unit in a second preset time period to enable the energy storage battery to charge the power battery through the voltage conversion unit; the control unit is also used for realizing series connection and parallel connection between energy storage battery packs in the energy storage battery through the second switch unit;
the voltage conversion unit is used for outputting direct current capable of meeting the charging requirement of the energy storage battery under the condition that the energy storage battery is charged by a power grid, and converting the output of the energy storage battery into the direct current capable of meeting the charging requirement of the power battery under the condition that the energy storage battery is charged by the power battery.
Preferably, the control unit is further configured to control the first switch unit and the second switch unit to enable the power grid to charge the power battery through the voltage conversion unit when the energy storage battery does not meet a preset condition;
the preset condition is that the energy storage battery works normally or the electric quantity of the energy storage battery meets the required electric quantity of the power battery.
Preferably, the second switching unit includes: the power battery switch group is connected with the power battery and the voltage conversion unit, and the controllable switch array is connected with the energy storage battery and the voltage conversion unit;
the control unit is used for controlling the first switch unit to be closed, the power battery switch group to be opened and the controllable switch array to enable the energy storage battery packs in the energy storage battery to be connected in parallel or in series within the first preset time period, and controlling the first switch unit to be opened, the power battery switch group to be closed and the controllable switch array to enable the energy storage battery packs to be connected in parallel or in series within the second preset time period.
Preferably, the controllable switch array comprises: the first ends of the switches in the first switch group are connected with the output end of the voltage conversion unit after being connected with each other, the second ends of the switches in the first switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the first ends of the switches in the second switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the second ends of the switches in the second switch group are connected with the output end of the voltage conversion unit after being connected with each other, the first ends of the switches in the third switch group and the fourth switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the second ends of the switches in the third switch group and the fourth switch group are connected with the input end of the voltage conversion unit after being connected with each other, and the first ends of the switches in the fifth switch group are connected with the first ends of the switches in the third switch group in a correspondence manner, and the second ends of the switches in the fifth switch group are respectively connected with the first ends of the switches in the energy storage battery packs and the fourth switch group in a one-to-one correspondence manner.
Preferably, when the power battery is charged by the power grid, the energy storage battery packs are connected in parallel or in series, and when the power battery is charged by the energy storage battery, the energy storage battery packs are connected in parallel or in series.
Preferably, the voltage conversion unit is a two-stage circuit, the front stage is an AC/DC conversion circuit, and the rear stage is a DC/DC conversion circuit.
Preferably, the AC/DC conversion circuit is a VIENNA circuit.
Preferably, the AC/DC conversion circuit is a rectifier bridge and a Boost circuit connected behind the rectifier bridge.
Preferably, the DC/DC conversion circuit is an isolated DC/DC circuit or a non-isolated DC/DC circuit.
Preferably, the first preset time period is a valley power time period, and the second preset time period is a non-valley power time period.
The application provides an energy storage is charged and is traded electric system, the first switch unit of being connected with the electric wire netting, the voltage conversion unit of being connected with first switch unit, the second switch unit of being connected with voltage conversion unit, energy storage battery and the power battery of being connected with the second switch unit respectively, the control unit of being connected with first switch unit and second switch unit respectively, wherein the control unit is used for making the electric wire netting charge for energy storage battery through voltage conversion unit in first preset time quantum, make energy storage battery charge for power battery through voltage conversion unit in second preset time quantum. Because the energy storage battery and the power battery are connected through the voltage conversion unit, in the process that the energy storage battery charges the power battery, the voltage conversion unit can realize energy conversion between the energy storage battery and the power battery through one-time energy conversion, and a multistage DC/DC conversion unit is not required to realize multiple times of energy conversion, so that the charging efficiency of the energy storage charging and battery replacing system is improved, and the use cost and the use space of the energy storage charging and battery replacing system are reduced. In addition, the control unit can control the energy storage battery to charge in the first preset time period and supply power to the power battery through the energy storage battery in the second preset time period, so that the charging and replacing system can store the voltage of the power grid into the energy storage battery in the first preset time period and supply power by the energy storage battery in the second preset time period, and the power consumption cost of the charging and replacing system is reduced.
Meanwhile, the voltage conversion unit integrates the AC/DC conversion circuit and the DC/DC conversion circuit, the energy of a power grid is converted by the voltage conversion unit to be charged for the energy storage battery and the power battery, and meanwhile, the energy storage battery can also be charged for the power battery of the electric vehicle through the voltage conversion unit. This design helps to improve system efficiency. Compared with the prior art, two sets of DC/DC circuits can be saved for each rechargeable battery unit, and the cost is lower.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of an energy storage charging and battery replacement system according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a voltage converting unit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of another voltage converting unit according to an embodiment of the present application;
the reference numerals are as follows:
the circuit comprises a first switch unit 10, a voltage conversion unit 11, a second switch unit 12, an energy storage battery 13, a control unit 14, a power battery 15, a power battery switch group 20, a first switch group 21, a second switch group 22, a third switch group 23, a fourth switch group 24, a fifth switch group 25, a Boost circuit 30, an isolated DC/DC circuit 31, a VIENNA circuit 32 and a non-isolated DC/DC circuit 33.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide an energy storage charging and battery replacing system, which is used for improving the charging efficiency of the energy storage charging and battery replacing system and reducing the use cost and the use space of the energy storage charging and battery replacing system.
In order that those skilled in the art will better understand the technical solutions of the present application, the following technical solutions are clearly and completely described in conjunction with the accompanying drawings and the detailed description, and it is obvious that the described embodiments are a part of the embodiments of the present application, not all of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a circuit diagram of an energy storage charging and battery replacement system according to an embodiment of the present disclosure. As shown in fig. 1, the energy storage charging and battery replacing system includes: the system comprises a first switch unit 10 connected with a power grid, a voltage conversion unit 11 connected with the first switch unit 10, a second switch unit 12 connected with the voltage conversion unit 11, an energy storage battery 13 and a power battery 15 which are respectively connected with the second switch unit 12, and a control unit 14 which is respectively connected with the first switch unit 10 and the second switch unit 12.
The control unit 14 is used for controlling the first switch unit 10 and the second switch unit 12 to enable the power grid to charge the energy storage battery 13 through the voltage conversion unit 11 in a first preset time period, and controlling the first switch unit 10 and the second switch unit 12 to enable the energy storage battery 13 to charge the power battery 15 through the voltage conversion unit 11 in a second preset time period; and the control unit 14 is also used for realizing the series connection and the parallel connection between the energy storage battery packs in the energy storage battery 13 through the second switching unit 12.
And the voltage conversion unit 11 is used for outputting direct current which can meet the charging requirement of the energy storage battery 13 under the condition that the power grid charges the energy storage battery 13, and converting the output of the energy storage battery 13 into direct current which can meet the charging requirement of the power battery 15 under the condition that the energy storage battery 13 charges the power battery 15.
It should be noted that, in the battery replacement station, the power battery 15 is a battery replacement battery for quickly replacing the electric vehicle; in the charging station, the power battery 15 refers to a battery in an electric vehicle. In addition, the energy storage battery 13 may be a completely new battery purchased separately, or may be a power battery 15 for the decommissioning of the electric vehicle.
In the specific implementation, the voltage conversion unit 11 converts the input signal of the power grid into the input signal of the energy storage battery 13 and/or the power battery 15 according to a charging curve with time as a variable.
In a specific implementation, the voltage conversion unit 11 is configured to convert an input signal of the power grid into an input signal of the energy storage Battery 13 and/or the power Battery 15 meeting a requirement of a Battery Management System (BMS). The voltage conversion unit 11 is a two-stage circuit, the front stage is an AC/DC conversion circuit, and the rear stage is a DC/DC conversion circuit.
The DC/DC conversion circuit may be an isolated DC/DC circuit or a non-isolated DC/DC circuit. In addition, the AC/DC conversion circuit may be a three-phase three-level (VIENNA) circuit, a connection circuit of a rectifier bridge and a Boost (Boost) circuit, or another AC/DC conversion circuit. The first preset time period is specifically a valley power time period, and the second preset time period is specifically a non-valley power time period, namely, a municipal specified valley power time period and a non-valley power time period. It is contemplated that the off-peak and off-peak electricity periods may change as municipal regulations change.
Fig. 2 is a circuit diagram of a voltage conversion unit according to an embodiment of the present application. As shown in fig. 2, the voltage conversion unit 11 includes a Boost circuit 30 and an isolation DC/DC circuit 31, an input terminal of the Boost circuit 30 is connected to a three-phase circuit of the power grid, and an output terminal of the Boost circuit 30 is connected to an input terminal of the isolation DC/DC circuit 31. The Boost circuit 30 is composed of a diode group, an inductor, a capacitor, and a controllable switch.
Fig. 3 is a circuit diagram of another voltage conversion unit according to an embodiment of the present application. As shown in fig. 3, the voltage conversion unit 11 includes a VIENNA circuit 32 and a non-isolated DC/DC circuit 33, wherein the input terminal of the VIENNA circuit 32 is connected to the three-phase circuit of the power grid, and the output terminal of the VIENNA circuit 32 is connected to the input terminal of the non-isolated DC/DC circuit 33. The VIENNA circuit 32 is composed of an inductor, a diode group, a switch group and a capacitor.
The energy storage charging and battery replacing system provided by the embodiment of the application comprises a first switch unit connected with a power grid, a voltage conversion unit connected with the first switch unit, a second switch unit connected with the voltage conversion unit, an energy storage battery and a power battery which are respectively connected with the second switch unit, and a control unit respectively connected with the first switch unit and the second switch unit, wherein the control unit is used for charging the power grid for the energy storage battery through the voltage conversion unit in a first preset time period, and charging the energy storage battery for the power battery through the voltage conversion unit in a second preset time period. Because the energy storage battery and the power battery are connected through the voltage conversion unit, in the process that the energy storage battery charges the power battery, the voltage conversion unit can realize energy conversion between the energy storage battery and the power battery through one-time energy conversion, and a multistage DC/DC conversion unit is not required to realize multiple times of energy conversion, so that the charging efficiency of the energy storage charging and battery replacing system is improved, and the use cost and the use space of the energy storage charging and battery replacing system are reduced. In addition, the control unit can control the energy storage battery to charge in the first preset time period and supply power to the power battery through the energy storage battery in the second preset time period, so that the charging and replacing system can store the voltage of the power grid into the energy storage battery in the first preset time period and supply power by the energy storage battery in the second preset time period, and therefore the power consumption cost of the charging and replacing system is reduced.
Meanwhile, the voltage conversion unit integrates the AC/DC conversion circuit and the DC/DC conversion circuit, the energy of a power grid is converted by the voltage conversion unit to be charged for the energy storage battery and the power battery, and meanwhile, the energy storage battery can also be charged for the power battery of the electric vehicle through the voltage conversion unit. This design helps to improve system efficiency. Compared with the prior art, two sets of DC/DC circuits can be saved for each rechargeable battery unit, and the cost is lower.
On the basis of the above embodiment, the control unit 14 is further configured to control the power grid to charge the power battery 15 through the first switch unit 10 and the second switch unit 12 in a case that the energy storage battery 13 does not satisfy the preset condition.
The preset condition is that the energy storage battery 13 works normally or the electric quantity of the energy storage battery 13 meets the required electric quantity of the power battery 15.
It can be understood that, when the electric quantity of the energy storage battery 13 cannot meet the requirement of charging the power battery 15, or the energy storage battery 13 works abnormally, the control unit 14 may also control the first switch unit 10 and the second switch unit 12 to enable the power grid to charge the power battery 15 through the voltage conversion unit 11, so as to ensure that the power battery 15 can be normally charged, thereby ensuring that the user experiences.
As shown in fig. 1, on the basis of the above embodiment, the second switching unit 12 includes: a power battery switch group 20 connected with the power battery 15 and the voltage conversion unit 11, and a controllable switch array connected with the energy storage battery 13 and the voltage conversion unit 11.
And the control unit 14 is used for controlling the first switch unit 10 to be closed, the power battery switch group 20 to be opened and the controllable switch array to enable the energy storage battery packs in the energy storage battery 13 to be connected in parallel or in series in a first preset time period, and controlling the first switch unit 10 to be opened, the power battery switch group 20 to be closed and the controllable switch array to enable the energy storage battery packs to be connected in parallel or in series in a second preset time period.
As a preferred embodiment, in a specific implementation, in the case that the energy storage battery 13 is charged by the power grid, the energy storage battery packs are connected in parallel or in series, and in the case that the power battery 15 is charged by the energy storage battery 13, the energy storage battery packs are connected in parallel or in series. Because the connection relation among the energy storage battery packs is not limited under the condition that the power grid charges the energy storage battery 13 or the energy storage battery 13 charges the power battery 15, the flexibility of the energy storage charging and battery replacement system is improved.
In order to improve the working efficiency of the energy storage charging and battery replacing system, as a preferred embodiment, the control unit 14 is further configured to select a target energy storage battery pack that is most matched with the power battery 15 according to preset parameters when the energy storage battery 13 charges the power battery 15, and control the target energy storage battery pack to charge the power battery 15 through a switch in the controllable switch array corresponding to the target energy storage battery pack.
It should be noted that the preset parameter is one or more of the voltage of the energy storage battery 13, the voltage of the power battery 15, the discharge current of the energy storage battery 13, and the battery capacity of the energy storage battery 13.
In addition, in order to further improve the working efficiency of the energy storage charging and battery replacing system, in the process of charging the power battery 15 by the energy storage battery 13, the control unit 14 is further configured to select the target energy storage battery pack that is most matched with the power battery 15 again according to the preset parameters under the condition that the target energy storage battery 13 does not meet the preset requirements.
As shown in fig. 1, as a preferred embodiment, the controllable switch array comprises: a first switch group 21, a second switch group 22, a third switch group 23, a fourth switch group 24 and a fifth switch group 25.
First ends of the switches in the first switch group 21 are connected with an output end of the voltage conversion unit 11 after being connected with each other, second ends of the switches in the first switch group 21 are connected with the energy storage battery packs in a one-to-one correspondence manner, first ends of the switches in the second switch group 22 are connected with the energy storage battery packs in a one-to-one correspondence manner, second ends of the switches in the second switch group 22 are connected with an output end of the voltage conversion unit 11 after being connected with each other, first ends of the switches in the third switch group 23 and the fourth switch group 24 are connected with the energy storage battery packs in a one-to-one correspondence manner, second ends of the switches in the third switch group 23 and the fourth switch group 24 are connected with an input end of the voltage conversion unit 11 after being connected with each other, first ends of the switches in the fifth switch group 25 are connected with first ends of the switches in the third switch group 23 in a one-to-one correspondence manner, and second ends of the switches in the fifth switch group 25 are connected with the energy storage battery packs and first ends of the switches in the fourth switch group 24 in a one-to-one correspondence manner.
Then, the control unit 14 controls the controllable switch array to connect the energy storage battery packs in the energy storage battery 13 in parallel or in series, specifically:
the first switch group 21, the second switch group 22, the third switch group 23 and the fourth switch group 24 are controlled to be closed, the fifth switch group 25 is controlled to be opened or the first switch group 21 and the second switch group 22 are controlled to be closed, and the third switch group 23, the fourth switch group 24 and the fifth switch group 25 are controlled to be opened, so that the energy storage battery packs are connected in parallel. The switches in the first switch group 21 and the second switch group 22 are controlled to be opened, the third switch group 23 and the fourth switch group 24 are controlled to be opened, and the fifth switch group 25 is controlled to be closed, so that the energy storage battery packs are connected in series, for example, the energy storage battery pack comprises four energy storage battery packs, the first switch group 21 comprises four switches, the second switch group 22 comprises four switches, the first switch group 21 is marked as a first switch, a second switch, a third switch and a fourth switch from left to right, the switches of the second switch group 22 are marked as a first switch, a second switch, a third switch and a fourth switch from left to right, the switches of the third switch group 23 are marked as a first switch, a second switch, a third switch and a fourth switch from top to bottom, and the switches of the fourth switch group 24 are marked as a first switch, a second switch, a third switch and a fourth switch from top to bottom.
Then, when the power grid charges the energy storage battery through the voltage conversion unit:
1. the first switch unit 10 is closed, the switches in the first switch group 21 and the second switch group 22 are closed, the rest switches in the second switch unit 12 are opened, and the rest switches realize the parallel charging of the energy storage battery pack.
2. When the first switch unit 10 is turned on, the first switch in the first switch group 21 is turned on, the fourth switch in the second switch group 22 is turned on, all switches in the fifth switch group 25 are turned on, and the rest switches in the second switch unit 12 are turned off, the energy storage battery pack is charged in series.
When the energy storage battery is discharged by the power battery:
1. when the first switch unit 10 is disconnected, the power battery switch group 20 is closed, the third switch group 23 and the fourth switch group 24 are closed, and the rest switches in the second switch unit 12 are disconnected, the parallel discharge of the energy storage battery pack is realized.
2. When the first switch unit 10 is turned off, the power battery switch group 20 is turned on, the first switch in the third switch group 23 is turned on, the fourth switch in the fourth switch group 24 is turned on, and the fifth switch group 25 is turned on, the serial discharge of the energy storage battery pack is realized.
It should be noted that the specific structure of the controllable switch array does not represent only one expression because of one expression.
The energy storage charging and battery replacing system provided by the embodiment of the application can enable the energy storage battery to be connected in series or in parallel according to the requirements of users in the charging or discharging process through the controllable switch array, and the flexibility of the energy storage charging and battery replacing system is improved.
On the basis of the above embodiment, the number of the power batteries 15 is n (where n is a positive integer), wherein the number of the voltage conversion units 11 may match the number of the power batteries 15. When the number of the voltage conversion units 11 matches the number of the power batteries 15, the number of the power battery switch groups 20 matches the number of the power batteries 15 and is connected to each power battery 15.
The energy storage charging and battery replacing system provided by the application is introduced in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. An energy storage charging and battery replacing system, comprising: the system comprises a first switch unit connected with a power grid, a voltage conversion unit connected with the first switch unit, a second switch unit connected with the voltage conversion unit, an energy storage battery and a power battery which are respectively connected with the second switch unit, and a control unit respectively connected with the first switch unit and the second switch unit;
the control unit is used for controlling the first switch unit and the second switch unit in a first preset time period to enable a power grid to charge the energy storage battery through the voltage conversion unit, and controlling the first switch unit and the second switch unit in a second preset time period to enable the energy storage battery to charge the power battery through the voltage conversion unit; the control unit is also used for realizing series connection and parallel connection between energy storage battery packs in the energy storage battery through the second switch unit;
the voltage conversion unit is used for outputting direct current capable of meeting the charging requirement of the energy storage battery under the condition that the energy storage battery is charged by a power grid, and converting the output of the energy storage battery into the direct current capable of meeting the charging requirement of the power battery under the condition that the energy storage battery is charged by the power battery.
2. The energy storage charging and battery replacing system according to claim 1, wherein the control unit is further configured to control the first switch unit and the second switch unit to enable a power grid to charge the power battery through the voltage conversion unit when the energy storage battery does not meet a preset condition;
the preset condition is that the energy storage battery works normally or the electric quantity of the energy storage battery meets the required electric quantity of the power battery.
3. The energy storage charging and replacing system as claimed in claim 1 or 2, wherein the second switch unit comprises: the power battery switch group is connected with the power battery and the voltage conversion unit, and the controllable switch array is connected with the energy storage battery and the voltage conversion unit;
the control unit is used for controlling the first switch unit to be closed, the power battery switch group to be opened and the controllable switch array to enable the energy storage battery packs in the energy storage battery to be connected in parallel or in series within the first preset time period, and controlling the first switch unit to be opened, the power battery switch group to be closed and the controllable switch array to enable the energy storage battery packs to be connected in parallel or in series within the second preset time period.
4. The energy storage charging and swapping system of claim 3, wherein the controllable switch array comprises: the first ends of the switches in the first switch group are connected with the output end of the voltage conversion unit after being connected with each other, the second ends of the switches in the first switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the first ends of the switches in the second switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the second ends of the switches in the second switch group are connected with the output end of the voltage conversion unit after being connected with each other, the first ends of the switches in the third switch group and the fourth switch group are connected with the energy storage battery packs in a one-to-one correspondence manner, the second ends of the switches in the third switch group and the fourth switch group are connected with the input end of the voltage conversion unit after being connected with each other, and the first ends of the switches in the fifth switch group are connected with the first ends of the switches in the third switch group in a correspondence manner, and the second ends of the switches in the fifth switch group are respectively connected with the first ends of the switches in the energy storage battery packs and the fourth switch group in a one-to-one correspondence manner.
5. The energy storage charging and battery replacing system as claimed in claim 4, wherein the energy storage battery packs are connected in parallel or in series when the power grid charges the energy storage batteries, and the energy storage battery packs are connected in parallel or in series when the energy storage batteries charge the power batteries.
6. The energy storage charging and battery replacing system as claimed in claim 1, wherein the voltage converting unit is a two-stage circuit, the front stage is an AC/DC converting circuit, and the rear stage is a DC/DC converting circuit.
7. The energy storage charging and battery replacing system as claimed in claim 6, wherein the AC/DC conversion circuit is a VIENNA circuit.
8. The energy storage charging and battery swapping system according to claim 6, wherein the AC/DC conversion circuit is a rectifier bridge and a Boost circuit connected behind the rectifier bridge.
9. The energy storage charging and replacing system as claimed in claim 6, wherein the DC/DC conversion circuit is an isolated DC/DC circuit or a non-isolated DC/DC circuit.
10. The energy storage charging and battery replacement system according to claim 1, wherein the first preset time period is a valley power time period, and the second preset time period is a non-valley power time period.
CN202121220465.XU 2021-06-02 2021-06-02 Energy storage charging and battery replacing system Active CN214929039U (en)

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