Control method and equipment of battery replacement energy storage cabinet, storage medium and battery replacement energy storage cabinet

Abstract

The invention provides a control method and device of a battery replacement and energy storage cabinet, a storage medium and the battery replacement and energy storage cabinet, the battery replacement and energy storage cabinet is connected with a power grid through an energy storage converter, the battery replacement and energy storage cabinet comprises a plurality of battery bins, each battery bin is provided with a battery management system, and the battery management systems are used for performing charging and discharging management on battery packs stored in the battery bins; the method comprises the steps of controlling a first battery pack to be charged when it is determined that the battery replacement energy storage cabinet is in a charging state; wherein the electric quantity of the first battery pack is smaller than a first preset value; when it is determined that the battery replacement energy storage cabinet is in the discharging state, controlling the second battery pack to discharge, and controlling the third battery pack to charge; wherein the second battery pack is an unlocked battery pack with the electric quantity larger than a second preset value, and the third battery pack is a locked battery pack with the electric quantity smaller than the first preset value. The utilization rate of the battery replacement energy storage cabinet can be improved.

Description

Technical Field

[0001] The present invention relates to the field of battery charging technology, and in particular to a control method, device, storage medium and battery replacement energy storage cabinet. Background Art

[0002] With the continuous development of society, electric vehicles such as electric bicycles and electric tricycles have been widely used.

[0003] In order to realize green travel of electric vehicles, it is inseparable from the energy supply of batteries, which has led to the widespread application of battery swap energy storage cabinets. Battery swap energy storage cabinets are used to replace batteries. The replaced batteries are charged in the battery swap cabinet, which is convenient for the next battery swap. There is no need to wait for the charging process, which can quickly solve the problem of electric vehicle mileage.

[0004] However, with the increasing number of battery swap energy storage cabinets, how to improve the utilization rate of battery swap energy storage cabinets has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present invention provide a control method, device, storage medium and battery-swap energy storage cabinet for a battery-swap energy storage cabinet to solve the problem of low utilization rate of the current battery-swap energy storage cabinet.

[0006] In a first aspect, an embodiment of the present invention provides a control method for a battery-swapping energy storage cabinet, wherein the battery-swapping energy storage cabinet is connected to a power grid through an energy storage converter, and the battery-swapping energy storage cabinet includes a plurality of battery compartments, each of which is provided with a battery management system, and the battery management system is used to manage the charge and discharge of the battery packs stored therein;

[0007] Control methods include:

[0008] When it is determined that the battery exchange energy storage cabinet is in a charging state, controlling the first battery pack to charge; wherein the first battery pack is a battery pack with a power less than a first preset value;

[0009] When it is determined that the battery exchange energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge and the third battery pack is controlled to charge; wherein the second battery pack is an unlocked battery pack with a power greater than a second preset value, and the third battery pack is a locked battery pack with a power less than a first preset value.

[0010] In a possible implementation, when it is determined that the battery exchange energy storage cabinet is in a discharging state, controlling the second battery pack to discharge and controlling the third battery pack to charge includes:

[0011] When it is determined that the battery exchange energy storage cabinet is in a discharging state, determine the first discharging power of the second battery pack; wherein the second battery pack is at least one battery pack, the first discharging power is the difference between the discharging power of the second battery pack and the charging power of the third battery pack, the discharging power of the second battery pack is determined by its corresponding battery management system, and the charging power of the third battery pack is determined by its corresponding battery management system;

[0012] Determining a discharge power of a second battery pack based on the first discharge power and the discharge power setting value;

[0013] discharging the second battery pack based on the discharge power and discharge capacity threshold of the second battery pack;

[0014] The third battery pack is charged based on the current power of the third battery pack and the charging power threshold.

[0015] In a possible implementation, determining the discharge power of the second battery pack based on the first discharge power and the discharge power setting value includes:

[0016] When the first discharge power is less than the discharge power setting value, setting the first discharge power as the discharge power of the second battery pack;

[0017] When the first discharge power is greater than the discharge power setting value, the discharge power setting value is set as the discharge power of the second battery pack.

[0018] In a possible implementation, when it is determined that the battery-swapping energy storage cabinet is in a charging state, controlling the first battery pack to charge includes:

[0019] When it is determined that the battery exchange energy storage cabinet is in a charging state, determine the first charging power of the first battery pack; wherein the first battery pack includes a fourth battery pack and a fifth battery pack, the fourth battery pack is an unlocked battery pack with a power less than a first preset value, the fifth battery pack is a locked battery pack with a power less than the first preset value, the first battery pack is at least one battery pack, the first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack, the charging power of the fourth battery pack is determined by its corresponding battery management system, and the charging power of the fifth battery pack is determined by its corresponding battery management system;

[0020] Determining a charging power of the first battery pack based on the first charging power and the charging power setting value;

[0021] The first battery pack is charged based on the charging power and the charging amount threshold of the first battery pack.

[0022] In a possible implementation, determining the charging power of the first battery pack based on the first charging power and the charging power setting value includes:

[0023] When the first charging power is less than the charging power setting value, setting the first charging power as the charging power of the first battery pack;

[0024] When the first charging power is greater than the charging power setting value, the charging power setting value is set as the charging power of the first battery pack.

[0025] In one possible implementation, the battery-swapping energy storage cabinet includes a master station control power mode and an automatic control power mode;

[0026] When the battery-swapping energy storage cabinet is in the master station control power mode, the battery-swapping energy storage cabinet is determined to be in a charging state or a discharging state based on the positive or negative value of the charge and discharge power controlled by the master station;

[0027] When the battery-swap energy storage cabinet is in automatic power control mode, the working state of the battery-swap energy storage cabinet is determined based on the working state of each preset time period.

[0028] In one possible implementation, the locked battery pack is a battery pack that is locked within a set time interval based on a user request. When it is determined that the user has not taken the battery pack within the set time interval after receiving the user request, the locked battery pack will be unlocked.

[0029] In a second aspect, an embodiment of the present invention provides a control device for a battery-swapping energy storage cabinet, wherein the battery-swapping energy storage cabinet is connected to a power grid through an energy storage converter, and the battery-swapping energy storage cabinet includes a plurality of battery compartments, each of which is provided with a battery management system, and the battery management system is used to manage the charge and discharge of the battery packs stored therein;

[0030] The control device includes:

[0031] A charging control module, used to control the charging of the first battery pack when it is determined that the battery exchange energy storage cabinet is in a charging state; wherein the first battery pack is a battery pack with a power less than a first preset value;

[0032] The discharge control module is used to control the discharge of the second battery pack and the charging of the third battery pack when it is determined that the battery exchange energy storage cabinet is in a discharge state; wherein the second battery pack is an unlocked battery pack with a charge greater than a second preset value, and the third battery pack is a locked battery pack with a charge less than a first preset value.

[0033] In a possible implementation, the discharge control module is used to determine the first discharge power of the second battery pack when it is determined that the battery exchange energy storage cabinet is in a discharge state; wherein the second battery pack is at least one battery pack, the first discharge power is the difference between the discharge power of the second battery pack and the charging power of the third battery pack, the discharge power of the second battery pack is determined by its corresponding battery management system, and the charging power of the third battery pack is determined by its corresponding battery management system;

[0034] Determining a discharge power of a second battery pack based on the first discharge power and the discharge power setting value;

[0035] discharging the second battery pack based on the discharge power and discharge capacity threshold of the second battery pack;

[0036] The third battery pack is charged based on the current power of the third battery pack and the charging power threshold.

[0037] In a possible implementation, the discharge control module is configured to set the first discharge power as the discharge power of the second battery pack when the first discharge power is less than the discharge power setting value;

[0038] When the first discharge power is greater than the discharge power setting value, the discharge power setting value is set as the discharge power of the second battery pack.

[0039] In a possible implementation, the charging control module is used to determine the first charging power of the first battery pack when it is determined that the battery exchange energy storage cabinet is in a charging state; wherein the first battery pack includes a fourth battery pack and a fifth battery pack, the fourth battery pack is an unlocked battery pack with a power less than a first preset value, the fifth battery pack is a locked battery pack with a power less than the first preset value, the first battery pack is at least one battery pack, the first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack, the charging power of the fourth battery pack is determined by its corresponding battery management system, and the charging power of the fifth battery pack is determined by its corresponding battery management system;

[0040] Determining a charging power of the first battery pack based on the first charging power and the charging power setting value;

[0041] The first battery pack is charged based on the charging power and the charging amount threshold of the first battery pack.

[0042] In a possible implementation, the charging control module is configured to set the first charging power as the charging power of the first battery pack when the first charging power is less than the charging power setting value;

[0043] When the first charging power is greater than the charging power setting value, the charging power setting value is set as the charging power of the first battery pack.

[0044] In one possible implementation, the battery-swapping energy storage cabinet includes a master station control power mode and an automatic control power mode;

[0045] When the battery-swapping energy storage cabinet is in the master station control power mode, the battery-swapping energy storage cabinet is determined to be in a charging state or a discharging state based on the positive or negative value of the charge and discharge power controlled by the master station;

[0046] When the battery-swap energy storage cabinet is in automatic power control mode, the working state of the battery-swap energy storage cabinet is determined based on the working state of each preset time period.

[0047] In one possible implementation, the locked battery pack is a battery pack that is locked within a set time interval based on a user request. When it is determined that the user has not taken the battery pack within the set time interval after receiving the user request, the locked battery pack will be unlocked.

[0048] In the third aspect, an embodiment of the present invention provides a management device for a battery exchange energy storage cabinet, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0049] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0050] In a fifth aspect, an embodiment of the present invention further provides a battery exchange energy storage cabinet, including an electrical cabinet and a battery cabinet;

[0051] A management device and an energy storage converter of a power-swapping energy storage cabinet are provided in the electrical cabinet. The management device of the power-swapping energy storage cabinet is used to control the operation of the power-swapping energy storage cabinet based on the control method of the power-swapping energy storage cabinet of any one of the first aspects. The energy storage converter is used to connect the DC bus of the power-swapping energy storage cabinet to the power grid for charging and discharging. The management device of the power-swapping energy storage cabinet is also used to lock the battery pack that meets the requirements based on the power-swapping reservation request sent by the user;

[0052] The battery cabinet includes multiple battery compartments, each of which is equipped with a battery management system and a battery pack. All battery packs are connected to the DC bus of the battery swapping energy storage cabinet. The battery management system is used to control the charging and discharging of the battery pack after receiving instructions from the management device of the battery swapping energy storage cabinet. The battery management system is also used to provide the charging and discharging power of the battery pack to the management device of the battery swapping energy storage cabinet.

[0053] The embodiment of the present invention provides a control method for a battery-swap energy storage cabinet. In order to improve the utilization rate of the battery-swap energy storage cabinet, the present invention connects the battery-swap energy storage cabinet to the power grid through an energy storage converter, and each battery compartment is provided with a battery management system, which is used to manage the charge and discharge of the battery packs stored therein. When it is determined that the battery-swap energy storage cabinet is in a charging state, the first battery pack is controlled to charge. When it is determined that the battery-swap energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge, and the third battery pack is controlled to charge. As a result, the battery-swap energy storage cabinet provided by the present invention can not only meet the battery replacement demand, but also have the function of grid demand side response. The battery-swap energy storage cabinet can store excess electrical energy when the power demand is low. At the peak of power demand, electrical energy can be released to the power grid to balance the power supply and demand, reduce the pressure on the power grid, reduce the peak-to-valley difference of the power grid, improve the peak-shaving capacity of the power grid, promote the consumption of new energy, and ensure the normal operation of the power grid. At the same time, it also brings economic benefits of the peak-to-valley difference to the operators of the battery-swap energy storage cabinets, and improves the utilization rate of the battery-swap energy storage cabinets. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0055] Figure 1 It is a structural schematic diagram of a battery-swapping energy storage cabinet provided in an embodiment of the present invention;

[0056] Figure 2 It is a schematic diagram of electrical connections of a battery-swapping energy storage cabinet provided in an embodiment of the present invention;

[0057] Figure 3 is a flow chart of a control method for a battery-swapping energy storage cabinet provided in an embodiment of the present invention;

[0058] Figure 4 It is a structural schematic diagram of a control device of a battery-swapping energy storage cabinet provided in an embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0061] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0062] At present, although there are many battery swap cabinets, the inventors have found that the existing battery swap cabinets are all equipped with a low-power unidirectional power module for each battery pack to achieve the charging of the battery pack, and use the battery pack to charge the battery to be charged. However, when there are no batteries to be charged in the battery cabinet, the battery cabinet will be idle and the battery cabinet cannot be used to the maximum extent.

[0063] In order to solve the problems of the prior art, the embodiments of the present invention provide a control method, device, storage medium and a battery-swap energy storage cabinet. The battery-swap energy storage cabinet provided by the embodiments of the present invention is first introduced below.

[0064] See also Figure 1 , which shows a battery exchange energy storage cabinet 100 provided in an embodiment of the present invention. The battery exchange energy storage cabinet 100 includes an electrical cabinet 110 and a battery cabinet 120. It can be one battery cabinet 120 or multiple battery cabinets 120. Here, one battery cabinet 120 is taken as an example for description.

[0065] The electrical cabinet 110 is provided with a management device 1110 and an energy storage converter 1120 of the power exchange energy storage cabinet. The management device 1110 is used to control the operation of the power exchange energy storage cabinet 100, and the energy storage converter 1120 is used to connect the DC bus of the power exchange energy storage cabinet 100 to the power grid for charging and discharging. In addition, the management device 1110 is also used to lock the battery pack that meets the requirements based on the power exchange reservation request sent by the user.

[0066] The battery cabinet 120 includes multiple battery compartments 1210, each of which is equipped with a battery management system and a battery pack, and all battery packs are connected to the DC bus of the battery swap energy storage cabinet. The battery management system is used to control the battery pack to charge and discharge after receiving instructions from the management device 1110 of the battery swap energy storage cabinet. In addition, the battery management system is also used to provide the management device 1110 with the charging and discharging power of the battery pack.

[0067] In some embodiments, the management device 1110 of the power exchange energy storage cabinet is used to monitor the power exchange energy storage cabinet 100, control and optimize its operating status. The management device 1110 can also be called an energy management system EMS. The management device 1110 can communicate with the energy storage converter 1120 via RS485, obtain the operating information of the energy storage converter 1120, and regulate the energy storage converter 1120 or perform safety linkage according to the operating strategy. Figure 2 As shown, the management device 1110 also communicates with all battery management systems and battery packs via the CAN bus.

[0068] In addition, the management device 1110 can communicate with the AC circuit breaker, air conditioner, AC fan speed regulator, voice module, backup power module, smoke sensor, water immersion sensor and other devices installed in the electrical cabinet 110 through RS485.

[0069] In this embodiment, the energy storage converter 1120 serves as an interface device between the power grid and the battery pack in the power exchange energy storage cabinet 100. The rated voltage of the AC port can be set to 400VAC, connected to the power grid, and the DC port voltage operating range can be 650-950VDC, connected to the DC750V DC bus inside the power exchange energy storage cabinet. In rectification mode, the 400VAC of the power grid is converted to DC750V, and power is supplied to the DC side bus. In inverter mode, the DC bus DC750V is converted to 400VAC, and power is supplied to the grid side, realizing AC / DC bidirectional conversion, with the functions of peak shaving and valley filling, frequency modulation and voltage regulation.

[0070] In some embodiments, the door of the battery compartment 1210 is controlled by an electromagnetic lock to control its switch state. The battery management system can manage the charge and discharge of the battery pack. The high-voltage DC750V interface is connected to the DC750V DC bus inside the battery exchange energy storage cabinet 100, and the low-voltage DC48V interface is connected to each battery pack. Each battery pack has two working modes: forward and reverse. In the forward mode, the battery management system converts the DC750V power of the DC bus into DC48V and provides power to the battery pack. In the reverse mode, the battery management system converts the DC48V power of the battery pack into DC750V and provides energy to the DC bus, realizing DC750V-DC48V bidirectional conversion. The CAN communication interface connects the management device 1110 through the CAN bus to realize communication with the EMS. The RS485 interface connects the battery pack to realize the in-place status monitoring and address synchronization functions of the battery pack. The remote control interface is used to collect the switch state of the electromagnetic lock, and is also used to control the unlocking of the electromagnetic lock. Not all compartments in the battery compartment 1210 are equipped with battery packs. Some are equipped with battery packs, and some are empty. When the user needs to swap batteries, he needs to put the low-battery into the empty battery compartment, and then take out the fully charged battery pack from the battery swap energy storage cabinet, thus realizing the shared battery swap operation of the electric bicycle.

[0071] In some embodiments, the battery replacement reservation request can be a request for a battery replacement reservation for a battery pack in a selected battery replacement energy storage cabinet by a user who wants to replace the battery through a mobile phone APP. After the user sends the battery replacement reservation request through the mobile phone APP, the battery replacement reservation request will be sent to the management device 1110, and the management device 1110 will lock the battery packs in the battery replacement energy storage cabinet 100 that meet the battery replacement requirements for a preset time interval. During the period when the battery pack is locked, other users are not allowed to use it, and when the energy storage is discharged, the locked battery pack is not allowed to be discharged, so as to ensure that the user has a battery pack available for replacement after arriving at the battery replacement energy storage cabinet 100 within the preset time interval. The preset time interval can be 15 minutes, and the preset time interval can be set according to the usage scenario, which is not limited here. If the user does not take the battery pack within the preset time interval, the locked battery pack will be unlocked. After the locked battery pack is unlocked, the battery pack can be discharged normally.

[0072] In this embodiment, the user can query the location of the nearby battery exchange energy storage cabinet through the APP, and can view the status of the battery pack in the selected battery compartment through the APP. The user can make an appointment for the battery of the selected battery exchange energy storage cabinet through the mobile phone APP. The mobile phone APP applies to the management device of the battery exchange energy storage cabinet for a request to lock the corresponding battery pack, and the management device locks the battery pack of the battery exchange energy storage cabinet within the set time interval. The set time interval can be 15 minutes, which can be set according to the application scenario. The set time interval is not limited here. During the locking period, the battery pack is not allowed to be used by other users, and when discharging energy storage, the locked battery pack cannot be discharged to ensure that the user has a battery pack available after arriving at the battery exchange energy storage cabinet. However, when the user does not perform the power extraction operation after exceeding the set time interval, the management device will unlock the locked battery pack. After unlocking, the battery pack allows other users to use it and can also perform energy storage discharge.

[0073] When a user makes an appointment to replace a battery, if there is no fully charged battery pack in the battery replacement energy storage cabinet, the battery replacement energy storage cabinet will automatically select the battery pack with the largest remaining power SOC, and quickly charge the battery pack, calculate the charging time, and send the charging time to the user's mobile phone APP as a reminder, so that the user can go to the battery replacement energy storage cabinet for battery replacement after the battery is fully charged.

[0074] After the user selects the battery pack of the battery swap energy storage cabinet through the mobile phone APP, when swapping batteries, the low-power battery pack needs to be placed in the empty compartment of the battery swap energy storage cabinet, and then the fully charged battery pack is taken out from the locked battery compartment. When the mobile phone APP applies for a battery swap request to the management device, the management device will determine whether there are empty compartments and fully charged battery packs in the battery swap energy storage cabinet. If there are empty compartments and fully charged battery packs, the management device can lock the fully charged battery pack. After the user arrives at the battery swap energy storage cabinet during the locking period, the management device will open the empty compartment door, and the user will place the low-power battery in the empty compartment. After the management device detects that the user has placed the low-power battery in the empty compartment, it will control the battery compartment corresponding to the locked battery pack to open the door, and the fully charged battery pack can be taken out.

[0075] See also Figure 1 and Figure 3 , which shows an implementation flow chart of the control method of the battery swap energy storage cabinet provided in an embodiment of the present invention, and the battery swap energy storage cabinet provided by the present invention, the battery swap energy storage cabinet is connected to the power grid through an energy storage inverter, and the battery swap energy storage cabinet includes multiple battery compartments, each battery compartment is provided with a battery management system, and the battery management system is used to manage the charging and discharging of the battery packs stored therein. Not all battery compartments are equipped with battery packs, some are equipped with battery packs, and some are empty. When the user needs to perform a battery swap operation, it is necessary to put the low-power battery into the empty battery compartment, and then take out the fully charged battery pack from the battery swap energy storage cabinet, thereby realizing the shared battery swap operation of the electric bicycle. The control method is described in detail as follows:

[0076] S310. When it is determined that the battery exchange energy storage cabinet is in a charging state, control the charging of the first battery pack; wherein the first battery pack is a battery pack with a power level less than a first preset value.

[0077] Among them, the first battery pack is a battery pack with a power less than the first preset value. The first preset value can be set by the user according to the application scenario. The first preset value can be set to 100% SOC or 95% SOC, which is not limited here. Regardless of whether the battery pack is locked or not, the battery pack will be charged as long as the power is less than the first preset value.

[0078] In some embodiments, the battery packs in the battery-swapping energy storage cabinet are periodically inspected to determine the status of each battery pack.

[0079] First, when the battery exchange energy storage cabinet is in a charging state, determine the first charging power of the first battery pack. Among them, the first battery pack includes a fourth battery pack and a fifth battery pack, the fourth battery pack is an unlocked battery pack with a power less than a first preset value, and the fifth battery pack is a locked battery pack with a power less than the first preset value. The first battery pack is at least one battery pack. The first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack. The charging power of the fourth battery pack is determined by its corresponding battery management system, and the charging power of the fifth battery pack is determined by its corresponding battery management system. The management device will determine the first charging power of the first battery pack based on the charging power sent by the respective battery management systems of the fourth battery pack and the fifth battery pack.

[0080] Then, based on the first charging power and the charging power setting value, the charging power of the first battery pack is determined.

[0081] Finally, the first battery pack is charged based on the charging power and the charging amount threshold of the first battery pack.

[0082] In this embodiment, when in the charging state, the management device will periodically detect the power of the fifth battery pack, that is, the locked battery pack, and count the "locked and not fully charged" battery pack queue C. lock Here, "not fully charged" means that the power is less than the first preset value. The sum of the charging powers of the battery management units corresponding to the "locked and not fully charged" batteries P lock In addition, the fourth battery pack, that is, the battery pack that is not locked but has a power less than the first preset value and is not fully charged, is periodically detected, and the sum of the power of the fourth battery pack is determined to be P unlock The first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack. 充MAX =P unlock +P lock , which is the sum of the charging powers of partially charged battery packs.

[0083] In this embodiment, after determining the first charging power P 充MAX and charging power setting value P 充SE After that, the charging power of the first battery pack can be determined. 充MAX Less than the charging power setting value P 充SE When the first charging power P 充MAX Set to the charging power of the first battery pack;

[0084] When the first charging power P 充MAX Greater than the charging power setting value P 充SE When the charging power is set to P 充SE Set to the charging power of the first battery pack.

[0085] After the charging power of the first battery pack is determined, the first battery pack can be charged. The management device concurrently sends the charging power value to the battery management system corresponding to the "unlocked and not fully charged" battery pack queue via the CAN bus.

[0086] The management device is equipped with a battery SOC upper limit SOC up , the default is 100%, set the battery SOC lower limit SOC low , the default is 5%, set the charging power setting value to P 充SE , set the energy storage discharge power setting value P 放 SE.

[0087] The battery management system is equipped with the maximum charging voltage, maximum charging current and maximum charging power value for each battery pack, and also the maximum discharge voltage, maximum discharge current and maximum discharge power value for each battery pack.

[0088] S320. When it is determined that the battery exchange energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge, and the third battery pack is controlled to charge.

[0089] The second battery pack is an unlocked battery pack with a power level greater than a second preset value, and the third battery pack is a locked battery pack with a power level less than a first preset value.

[0090] In some embodiments, first, when it is determined that the battery exchange energy storage cabinet is in a discharging state, the first discharge power of the second battery pack is determined. The second battery pack is at least one battery pack, and the first discharge power is the difference between the discharge power of the second battery pack and the charging power of the third battery pack. The discharge power of the second battery pack is determined by its corresponding battery management system, and the charging power of the third battery pack is determined by its corresponding battery management system.

[0091] Next, the discharge power of the second battery pack is determined based on the first discharge power and the discharge power setting value.

[0092] Then, based on the discharge power and the discharge amount threshold of the second battery pack, the second battery pack is discharged.

[0093] Finally, based on the current power level of the third battery pack and the charging level threshold, the third battery pack is charged.

[0094] In this embodiment, during the discharge process of the battery exchange energy storage cabinet, the locked battery pack will continue to charge when the power level is lower than the first preset value.

[0095] At this time, the management setting will also periodically detect the power of the third battery pack, which is the locked battery pack, and count the "locked and not fully charged" battery pack queue C lockHere, "not fully charged" means that the power is less than the first preset value. The sum of the charging powers of the battery management units corresponding to the "locked and not fully charged" batteries P lock In addition, it is necessary to periodically detect the second battery pack, that is, the battery pack that is not locked and has a power greater than the second preset value. At this time, the sum of the discharge power of the battery pack is P unlock Calculate the first discharge power P at this time 放MAX =P unlock -P lock .

[0096] In this embodiment, after determining the first discharge power P 放MAX and discharge power setting value P 放SE After that, the discharge power of the second battery pack can be determined. 放MAX Less than the discharge power setting value P 放SE When the first discharge power P 放MAX Set as the discharge power of the second battery pack. 放MAX Greater than the discharge power setting value P 放SE When the discharge power is set to P 放SE Set to the discharge power of the second battery pack.

[0097] The management device will periodically detect the SOC of all battery packs and monitor in real time whether the battery pack is locked or unlocked. When the battery pack is charging, it will determine whether the battery pack SOC has reached the upper limit SOC up If yes, the battery pack will be controlled to stop charging. When the battery is discharging, it will determine whether the battery pack SOC reaches the lower limit SOC low If yes, the battery pack is controlled to stop discharging.

[0098] In some embodiments, the battery-swapping energy storage cabinet has two operating modes, one is the master station control power mode, and the other is the automatic power control mode.

[0099] In this embodiment, when in the master station control power mode, when the master station control power flag is 1, the battery exchange energy storage cabinet charges or discharges according to the master station control charging and discharging power value control system, charging when the power value is positive, and discharging when the power value is negative. When in the automatic power control mode, the flag becomes 0, and the working state of the battery exchange energy storage cabinet is determined based on the working state of each preset time period.

[0100] In the automatic power control mode, the battery swap energy storage cabinet will be configured in different modes in the 24 time periods of a day, namely charging mode, discharging mode and standby mode. Charging power value and discharging power value are also set in the discharge mode and charging mode. The battery swap energy storage cabinet will determine whether to charge or discharge the energy storage charging cabinet according to the mode of the current time period queried in the cycle.

[0101] The control method provided by the present invention, in order to improve the utilization rate of the battery exchange energy storage cabinet, the present invention connects the battery exchange energy storage cabinet to the power grid through an energy storage converter, and each battery compartment is provided with a battery management system, and the battery management system is used to manage the charge and discharge of the battery packs stored therein. When it is determined that the battery exchange energy storage cabinet is in a charging state, the first battery pack is controlled to charge, and when it is determined that the battery exchange energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge, and the third battery pack is controlled to charge. Thereby, the battery exchange energy storage cabinet provided by the present invention can not only meet the battery exchange demand, but also have the function of grid demand side response. The battery exchange energy storage cabinet can store excess electric energy when the power demand is low. At the peak of power demand, electric energy can be released to the power grid to balance the power supply and demand, reduce the pressure on the power grid, reduce the peak-to-valley difference of the power grid, improve the peak-shaving capacity of the power grid, promote the consumption of new energy, and ensure the normal operation of the power grid. At the same time, it also brings economic benefits of the peak-to-valley difference to the operators of the battery exchange energy storage cabinets, and improves the utilization rate of the battery exchange energy storage cabinets.

[0102] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0103] Based on the control method of the battery-swapping energy storage cabinet provided in the above embodiment, the present invention also provides a specific implementation of the control device of the battery-swapping energy storage cabinet applied to the control method of the battery-swapping energy storage cabinet. Please refer to the following embodiment.

[0104] like Figure 4 As shown, a control device 400 of a power-swapping energy storage cabinet is provided. The power-swapping energy storage cabinet is connected to a power grid via an energy storage converter. The power-swapping energy storage cabinet includes a plurality of battery compartments, each of which is provided with a battery management system. The battery management system is used to manage the charge and discharge of the battery packs stored therein;

[0105] The control device 400 comprises:

[0106] The charging control module 410 is used to control the charging of the first battery pack when it is determined that the battery exchange energy storage cabinet is in a charging state; wherein the first battery pack is a battery pack with a power less than a first preset value;

[0107] The discharge control module 420 is used to control the discharge of the second battery pack and the charging of the third battery pack when it is determined that the battery exchange energy storage cabinet is in a discharge state; wherein the second battery pack is an unlocked battery pack with a charge greater than a second preset value, and the third battery pack is a locked battery pack with a charge less than a first preset value.

[0108] In a possible implementation, the discharge control module 420 is used to determine the first discharge power of the second battery pack when it is determined that the battery exchange energy storage cabinet is in a discharge state; wherein the second battery pack is at least one battery pack, the first discharge power is the difference between the discharge power of the second battery pack and the charging power of the third battery pack, the discharge power of the second battery pack is determined by its corresponding battery management system, and the charging power of the third battery pack is determined by its corresponding battery management system;

[0109] Determining a discharge power of a second battery pack based on the first discharge power and the discharge power setting value;

[0110] discharging the second battery pack based on the discharge power and discharge capacity threshold of the second battery pack;

[0111] The third battery pack is charged based on the current power of the third battery pack and the charging power threshold.

[0112] In a possible implementation, the discharge control module 420 is configured to set the first discharge power as the discharge power of the second battery pack when the first discharge power is less than the discharge power setting value;

[0113] When the first discharge power is greater than the discharge power setting value, the discharge power setting value is set as the discharge power of the second battery pack.

[0114] In a possible implementation, the charging control module 410 is used to determine the first charging power of the first battery pack when it is determined that the battery exchange energy storage cabinet is in a charging state; wherein the first battery pack includes a fourth battery pack and a fifth battery pack, the fourth battery pack is an unlocked battery pack with a power less than a first preset value, the fifth battery pack is a locked battery pack with a power less than the first preset value, the first battery pack is at least one battery pack, the first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack, the charging power of the fourth battery pack is determined by its corresponding battery management system, and the charging power of the fifth battery pack is determined by its corresponding battery management system;

[0115] Determining a charging power of the first battery pack based on the first charging power and the charging power setting value;

[0116] The first battery pack is charged based on the charging power and the charging amount threshold of the first battery pack.

[0117] In a possible implementation, the charging control module 410 is configured to set the first charging power as the charging power of the first battery pack when the first charging power is less than the charging power setting value;

[0118] When the first charging power is greater than the charging power setting value, the charging power setting value is set as the charging power of the first battery pack.

[0119] In one possible implementation, the battery-swapping energy storage cabinet includes a master station control power mode and an automatic control power mode;

[0120] When the battery-swapping energy storage cabinet is in the master station control power mode, the battery-swapping energy storage cabinet is determined to be in a charging state or a discharging state based on the positive or negative value of the charge and discharge power controlled by the master station;

[0121] When the battery-swap energy storage cabinet is in automatic power control mode, the working state of the battery-swap energy storage cabinet is determined based on the working state of each preset time period.

[0122] In one possible implementation, the locked battery pack is a battery pack that is locked within a set time interval based on a user request. When it is determined that the user has not taken the battery pack within the set time interval after receiving the user request, the locked battery pack will be unlocked.

[0123] The embodiment of the present invention provides a control device for a battery-swap energy storage cabinet. In order to improve the utilization rate of the battery-swap energy storage cabinet, the present invention connects the battery-swap energy storage cabinet to the power grid through an energy storage converter, and each battery compartment is provided with a battery management system, which is used to manage the charge and discharge of the battery packs stored therein. When it is determined that the battery-swap energy storage cabinet is in a charging state, the first battery pack is controlled to charge. When it is determined that the battery-swap energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge, and the third battery pack is controlled to charge. As a result, the battery-swap energy storage cabinet provided by the present invention can not only meet the battery replacement demand, but also have the function of grid demand side response. The battery-swap energy storage cabinet can store excess electric energy when the power demand is low. At the peak of power demand, electric energy can be released to the power grid to balance the power supply and demand, reduce the pressure on the power grid, reduce the peak-to-valley difference of the power grid, improve the peak-shaving capacity of the power grid, promote the consumption of new energy, and ensure the normal operation of the power grid. At the same time, it also brings economic benefits of the peak-to-valley difference to the operators of the battery-swap energy storage cabinets, and improves the utilization rate of the battery-swap energy storage cabinets.

[0124] Figure 5 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 5 As shown, the electronic device 5 of this embodiment includes: a processor 50, a memory 51, and a computer program 52 stored in the memory 51 and executable on the processor 50. When the processor 50 executes the computer program 52, the steps in the control method embodiments of the above-mentioned battery exchange energy storage cabinet are implemented, for example Figure 3 Alternatively, when the processor 50 executes the computer program 52, the functions of each module in the above-mentioned device embodiments are realized, for example, Figure 4 Functions of modules 410 to 420 are shown.

[0125] Exemplarily, the computer program 52 may be divided into one or more modules, which are stored in the memory 51 and executed by the processor 50 to implement the present invention. The one or more modules may be a series of computer program instruction segments that can implement specific functions, and the instruction segments are used to describe the execution process of the computer program 52 in the electronic device 5. For example, the computer program 52 may be divided into Figure 4 Modules 410 to 420 are shown.

[0126] The electronic device 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will appreciate that Figure 5 It is only an example of the electronic device 5 and does not constitute a limitation of the electronic device 5. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0127] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0128] The memory 51 may be an internal storage unit of the electronic device 5, such as a hard disk or memory of the electronic device 5. The memory 51 may also be an external storage device of the electronic device 5, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 5. Further, the memory 51 may also include both an internal storage unit of the electronic device 5 and an external storage device. The memory 51 is used to store the computer program and other programs and data required by the electronic device. The memory 51 may also be used to temporarily store data that has been output or is to be output.

[0129] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0130] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0131] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0132] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0133] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0135] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the control method embodiments of each of the above-mentioned battery exchange energy storage cabinets. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium.

[0136] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control method for a battery-swapping energy storage cabinet, characterized in that: The battery exchange energy storage cabinet is connected to the power grid through an energy storage converter. The battery exchange energy storage cabinet includes a plurality of battery compartments, each of which is provided with a battery management system, and the battery management system is used to manage the charge and discharge of the battery packs stored therein; The control method comprises: When it is determined that the battery exchange energy storage cabinet is in a charging state, controlling the first battery pack to charge; wherein the first battery pack is a battery pack whose power is less than a first preset value; When it is determined that the battery exchange energy storage cabinet is in a discharging state, the second battery pack is controlled to discharge and the third battery pack is controlled to charge; wherein, the second battery pack is an unlocked battery pack and the power is greater than a second preset value, and the third battery pack is a locked battery pack and the power is less than a first preset value.

2. The control method of the battery exchange energy storage cabinet according to claim 1, characterized in that: When it is determined that the battery exchange energy storage cabinet is in a discharging state, controlling the second battery pack to discharge and controlling the third battery pack to charge includes: When it is determined that the battery exchange energy storage cabinet is in a discharging state, determine the first discharging power of the second battery pack; wherein the second battery pack is at least one battery pack, the first discharging power is the difference between the discharging power of the second battery pack and the charging power of the third battery pack, the discharging power of the second battery pack is determined by its corresponding battery management system, and the charging power of the third battery pack is determined by its corresponding battery management system; Determining a discharge power of the second battery pack based on the first discharge power and a discharge power setting value; discharging the second battery pack based on a discharge power and a discharge capacity threshold of the second battery pack; The third battery pack is charged based on the current power of the third battery pack and a charging power threshold.

3. The control method of the battery exchange energy storage cabinet according to claim 2, characterized in that: The determining the discharge power of the second battery pack based on the first discharge power and the discharge power setting value includes: When the first discharge power is less than the discharge power setting value, setting the first discharge power as the discharge power of the second battery pack; When the first discharge power is greater than the discharge power setting value, the discharge power setting value is set as the discharge power of the second battery pack.

4. The control method of the battery exchange energy storage cabinet according to claim 1, characterized in that: When it is determined that the battery exchange energy storage cabinet is in a charging state, controlling the first battery pack to charge includes: When it is determined that the battery exchange energy storage cabinet is in a charging state, determine the first charging power of the first battery pack; wherein the first battery pack includes a fourth battery pack and a fifth battery pack, the fourth battery pack is an unlocked battery pack with a power less than the first preset value, the fifth battery pack is a locked battery pack with a power less than the first preset value, the first battery pack is at least one battery pack, the first charging power is the sum of the charging power of the fourth battery pack and the charging power of the fifth battery pack, the charging power of the fourth battery pack is determined by its corresponding battery management system, and the charging power of the fifth battery pack is determined by its corresponding battery management system; Determining a charging power of the first battery pack based on the first charging power and a charging power setting value; The first battery pack is charged based on the charging power and the charging amount threshold of the first battery pack.

5. The control method of the battery exchange energy storage cabinet according to claim 4, characterized in that: The determining the charging power of the first battery pack based on the first charging power and the charging power setting value includes: When the first charging power is less than the charging power setting value, setting the first charging power as the charging power of the first battery pack; When the first charging power is greater than the charging power setting value, the charging power setting value is set as the charging power of the first battery pack.

6. The control method of the battery exchange energy storage cabinet according to any one of claims 1 to 5, characterized in that: The battery exchange energy storage cabinet includes a master station control power mode and an automatic control power mode; When the battery-swapping energy storage cabinet is in the master station control power mode, the battery-swapping energy storage cabinet is determined to be in a charging state or a discharging state based on the positive or negative value of the charge and discharge power controlled by the master station; When the battery-swap energy storage cabinet is in the automatic power control mode, the working state of the battery-swap energy storage cabinet is determined based on the working state of each preset time period.

7. The control method of the battery exchange energy storage cabinet according to any one of claims 1 to 5, characterized in that: The locked battery pack is a battery pack that is locked within a set time interval based on a user request. When it is determined that the user has not taken the battery pack within the set time interval after receiving the user request, the locked battery pack will be unlocked.

8. A management device for a battery-swapping energy storage cabinet, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 7.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A battery-swapping energy storage cabinet, characterized in that: Including electrical cabinet and battery cabinet; The electrical cabinet is provided with a management device and an energy storage converter of a power exchange energy storage cabinet, the management device of the power exchange energy storage cabinet is used to control the operation of the power exchange energy storage cabinet based on the control method of the power exchange energy storage cabinet according to any one of claims 1 to 7, the energy storage converter is used to connect the DC bus of the power exchange energy storage cabinet to the power grid for charging and discharging, and the management device of the power exchange energy storage cabinet is also used to lock the battery pack that meets the requirements based on the power exchange reservation request sent by the user; The battery cabinet includes multiple battery compartments, each battery compartment is equipped with a battery management system and a battery pack, all battery packs are connected to the DC bus of the battery swapping energy storage cabinet, the battery management system is used to control the charging and discharging of the battery pack after receiving instructions from the management device of the battery swapping energy storage cabinet, and the battery management system is also used to provide the charging and discharging power of the battery pack to the management device of the battery swapping energy storage cabinet.

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