CN116826910A - Charge-discharge control method, temperature control device, and readable storage medium - Google Patents

Charge-discharge control method, temperature control device, and readable storage medium Download PDF

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Publication number
CN116826910A
CN116826910A CN202310799781.4A CN202310799781A CN116826910A CN 116826910 A CN116826910 A CN 116826910A CN 202310799781 A CN202310799781 A CN 202310799781A CN 116826910 A CN116826910 A CN 116826910A
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China
Prior art keywords
battery pack
conversion unit
power conversion
compressor
power
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Pending
Application number
CN202310799781.4A
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Chinese (zh)
Inventor
黄城彬
幸云辉
陈熙
王雷
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Ecoflow Technology Ltd
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Ecoflow Technology Ltd
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Priority to CN202310799781.4A priority Critical patent/CN116826910A/en
Publication of CN116826910A publication Critical patent/CN116826910A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses a charge and discharge control method, temperature control equipment and a storage medium, wherein the method comprises the following steps: when an external power supply supplies power to the compressor, if a charging request of a battery pack is received, determining the battery state of the battery pack; if the battery pack is in an overdischarge state, performing power compensation on the requested power supply of the compressor to obtain target power supply; determining a target output current of the power conversion unit according to the battery voltage, the request charging current and the target power supply power of the battery pack; the power conversion unit is controlled to supply power to the compressor and charge the battery pack according to the target output current. According to the method, the power supply power of the compressor is increased, and the required power supply current of the compressor is unchanged, so that the target output current is larger than the sum of the required charging current and the required power supply current, the actual charging current of the battery pack is larger than the required charging current, the charging speed of the battery pack can be increased, the battery pack can be restored to be normal as soon as possible, and the influence on the compressor is reduced to the greatest extent.

Description

Charge-discharge control method, temperature control device, and readable storage medium
Technical Field
The present application relates to the field of power management technologies, and in particular, to a charge and discharge control method, a temperature control device, and a computer readable storage medium.
Background
At present, a temperature control device with a local temperature regulation function such as a mobile air conditioner and a mobile refrigerator can supply power through a battery pack, and when the temperature control device is connected to an external power supply, the external power supply can charge the battery pack through the temperature control device. According to the optimal charging strategy of the battery pack, the temperature control device needs to respond to the charging request voltage and the charging request current of the battery pack. Since the output end of the power conversion unit in the temperature control device is connected with the battery pack and the compressor of the temperature control device respectively, the charging voltage of the battery pack is the same as the power supply voltage of the compressor. When the battery pack is abnormal, the output of the output end of the power conversion unit is limited by the abnormal battery pack, so that the output of the power conversion unit cannot meet the working requirement of the compressor.
Therefore, how to avoid the operation abnormality of the compressor due to the abnormality of the battery pack becomes a problem to be solved.
Disclosure of Invention
The application provides a charge and discharge control method, temperature control equipment and a computer readable storage medium, which solve the problem of abnormal operation of a compressor caused by abnormal voltage of a battery pack in the related technology.
In a first aspect, the present application provides a charge-discharge control method, the method including:
when the external power supply supplies power to the compressor through the power conversion unit, if a charging request of a battery pack is received, determining the battery state of the battery pack; the charging request includes a request for a charging current; wherein the battery pack is detachably connected to the second end of the power conversion unit; if the battery pack is in an overdischarge state, performing power compensation on the requested power supply of the compressor to obtain target power supply; determining a target output current of the power conversion unit according to the battery voltage of the battery pack, the request charging current and the target power supply power; and controlling the power conversion unit to supply power to the compressor and charge the battery pack according to the target output current.
According to the charge and discharge control method, when the battery pack is in the overdischarge state, the requested power supply of the compressor is compensated, the target output current of the power conversion unit is determined according to the compensated target power supply, the battery voltage of the battery pack and the requested charging current of the battery pack, and the compressor is powered and the battery pack is charged on the basis. When the battery pack is abnormal, the power supply voltage of the compressor is limited by the battery voltage, so that the power supply voltage cannot be increased, and the actual power supply is smaller than the request power. According to the application, power compensation is added on the basis of the power supply request of the compressor so as to reserve a certain margin, and on the basis, the target output current is calculated on the basis of the regulated target power supply, the maximum power supply voltage which can be achieved at the moment and the request charging current of the battery pack, so that the power supply current which is actually distributed by the compressor can be improved at the moment. Therefore, under the condition that the power supply voltage of the compressor is limited by the abnormal battery pack, the output current of the power conversion unit is increased to increase the power supply current of the compressor, the actual power supply of the compressor is increased, and the influence of the battery pack abnormality on the compressor is reduced to the greatest extent.
In a second aspect, the present application also provides a temperature control device, the temperature control device including a memory and a processor;
the memory is used for storing a computer program;
the processor is configured to execute the computer program and implement the charge and discharge control method as described above when executing the computer program.
In a third aspect, the present application also provides a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to implement a charge and discharge control method as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a temperature control apparatus according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another temperature control device according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a temperature control device according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a temperature control device according to an embodiment of the present application;
fig. 5 is a schematic flow chart of a charge-discharge control method according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of the substeps of determining a target output current provided by an embodiment of the application;
fig. 7 is a schematic flow chart of another charge-discharge control method provided by an embodiment of the present application;
fig. 8 is a schematic flow chart of another charge-discharge control method provided by an embodiment of the present application;
fig. 9 is a schematic flow chart of another charge-discharge control method provided by an embodiment of the present application;
fig. 10 is a schematic flow chart of another charge-discharge control method provided by an embodiment of the present application;
FIG. 11 is a schematic flow chart of a hot plug of a battery pack according to an embodiment of the present application;
fig. 12 is a schematic flow chart of another charge-discharge control method according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Embodiments of the present application provide a charge and discharge control method, a temperature control device, and a computer-readable storage medium. The charging and discharging control method can be applied to temperature control equipment, and can be used for compensating the required power supply of the compressor when the battery pack is in an overdischarge state, and determining the target output current of the power conversion unit according to the compensated target power supply, the battery voltage of the battery pack and the required charging current of the battery pack. Under the condition that the power supply voltage is limited by the battery voltage, the output current is recalculated by combining the battery voltage and the requested charging current of the battery pack after the requested power supply of the compressor is compensated, so that the actual power supply of the compressor is increased by changing the power supply current, the actual power supply can meet the requested power supply of the compressor as much as possible, and the influence of the battery pack abnormality on the compressor is reduced to the greatest extent.
In the embodiment of the application, the temperature control equipment can comprise an electronic equipment such as a mobile air conditioner, a mobile refrigerator and the like which is provided with a compressor and can regulate the temperature of a local area. For example, air conditioners installed on a car as a house, outdoor air conditioners, outdoor ice makers, outdoor refrigerators, and the like.
Referring to fig. 1, fig. 1 is a schematic diagram of a temperature control apparatus 10 according to an embodiment of the application. As shown in fig. 1, the temperature control apparatus 10 may include a compressor 11 and a power conversion unit 12, wherein a first end of the power conversion unit 12 is for connection with an external power source 20, and a second end of the power conversion unit 12 is connected with the compressor 11.
By way of example, the external power source 20 may be an ac power grid, a photovoltaic panel or generator, or the like, without limitation. Wherein the external power source 20 may supply power to the compressor 11 via the power conversion unit 12.
Referring to fig. 2, fig. 2 is a schematic diagram of another temperature control apparatus 10 according to an embodiment of the application. As shown in fig. 2, the temperature control apparatus 10 may include a compressor 11, a power conversion unit 12, and a relay 13, wherein a first end of the power conversion unit 12 is used to be connected to an external power source 20, and a second end of the power conversion unit 12 is connected to the compressor 11.
As shown in fig. 2, the second terminal of the power conversion unit 12 is also connected to a first terminal of the relay 13, and the second terminal of the relay 13 is used to connect to the battery pack 30. Wherein the relay 13 is used to cut off or conduct the connection between the power conversion unit 12 and the battery pack 30.
The battery pack 30 may be a battery pack in the energy storage device or may be a separate battery pack. As shown in fig. 2, the battery pack 30 may include a cell module 301 and a battery management system (Battery Management System, BMS) 302.
In an embodiment of the present application, the external power source 20 may also charge the battery pack 30 via the temperature control device 10. For example, the battery management system 302 may send a charge request of the battery pack 30 to the temperature control device 10 to request the temperature control device 10 to control the power conversion unit 12 to charge the battery pack 30. The battery pack 30 may also supply power to the compressor 11 through the relay 13 when the temperature control apparatus 10 is not connected to the external power source 20. For example, when the voltage of the battery pack 30 is normal, the battery pack 30 can supply 42V to 58V of direct current as the operation power for the compressor 11.
In some embodiments, in a scenario in which the external power source 20 supplies power to the temperature control device 10, and the temperature control device 10 is not connected to the battery pack 30, the power conversion unit 12 may output the power supply according to the requested power supply voltage and the requested power supply current of the compressor 11. For example, when the compressor 11 is operating normally, the requested supply voltage of the compressor 11 may be 58.8V, the requested supply current may be a maximum value, and the power conversion unit 12 may output at the maximum supply power. At this time, the external power source 20 does not output abnormal power due to abrupt acceleration of the compressor 11, resulting in a shutdown of the compressor 11.
In other embodiments, in the scenario in which the battery pack in a normal state is charged by the external power source 20, if it is detected that the battery pack 30 is connected to the temperature control apparatus 10, the output voltage of the power conversion unit 12 is reduced. By way of example, when the minimum normal operating voltage of the compressor 11 is 42V, the output voltage of the power conversion unit 12 may be dropped to 42V.
It should be noted that, by reducing the output voltage of the power conversion unit 12 when the battery pack 30 is connected to the temperature control apparatus 10, not only the occurrence of a large current striking the battery pack 30 but also the momentary pull-down of the output voltage of the power conversion unit 12 can be avoided.
In some embodiments, when the battery pack 30 is connected to the temperature control device 10, if the battery pack 30 is in a shutdown state, the BMS system also needs to be awakened. By way of example, the relay 13 may include a soft start relay and a main relay. When the main relay is turned on, the power conversion unit 12 may supply a high-power charging voltage to the battery pack 30. When the soft start relay is turned on, the power conversion unit 12 supplies only the operating voltage and not the high power charging voltage. When waking up the BMS system, the power conversion unit 12 may output an operating voltage to the BMS system by turning on a soft start relay (not shown) in the relay 13 to wake up the BMS system.
After waking up the BMS system, if it is detected that the battery voltage of the battery pack 30 is greater than the preset voltage threshold, it is confirmed that the battery pack 30 is in a normal state, and the battery pack 30 is charged according to the requested charging voltage and the requested charging current of the battery pack 30. The preset voltage threshold may be set according to practical situations, and specific values are not limited herein. For example, pre-heatingThe set voltage threshold may be 42V. At this time, the power conversion unit 12 may control a main relay (not shown) in the relay 11 to be turned on in response to a request for the charging current I of the battery pack 1 And the requested supply current I of the compressor 11 2 And controlling the output power in the range of current sum (I) 1 +I 2 ) And the product of the battery voltage U.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a temperature control device 10 according to an embodiment of the present application, and as shown in fig. 3, the power conversion unit 12 may include an AC/DC (Alternating Current to Direct Current ) converter and a DC/DC (Direct Current to Direct Current, direct current to direct current) converter.
Wherein, a bus capacitor C is connected between the AC/DC converter and the DC/DC converter 1 The output end of the DC/DC converter is connected with a port capacitor C 2 . Port capacitance C 2 For filtering the signal output by the DC/DC converter.
As shown in fig. 3, since the output terminal (p+, P-) of the power conversion unit 12 is connected to the battery pack 30, the output voltage of the output terminal (p+, P-) of the power conversion unit 12 can float only up and down on the battery voltage of the battery pack, and the amplitude of the float can be controlled by software, for example, 0.5V or more. For example, when the battery voltage of the battery pack 30 is 38V, if the requested charging voltage of the battery pack 30 is 40V, the output voltage of the output terminal (p+, P-) of the power conversion unit 12 may be 40V. While the rated operating voltage range of the compressor 11 of the temperature control apparatus 10 is 42V to 60V, since the output voltage of the output terminal (P +, P-) of the power conversion unit 12 is limited to 40V by the requested charging voltage of the battery pack 30, the operation of the compressor 11 at 40V results in an abnormal operating state of the compressor 11.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a temperature control apparatus 10 according to an embodiment of the application. The temperature control device 10 may include a processor 1001 and a memory 1002, where the processor 1001 and the memory 1002 may be connected by a bus, which may be any suitable bus such as an integrated circuit (Inter-integrated Circuit, I2C) bus.
The memory 1002 may include a storage medium and an internal memory, among others. The storage medium may store an operating system and a computer program. The computer program comprises program instructions that, when executed, cause the processor 1001 to perform the charge and discharge control method described in any of the embodiments.
Wherein the processor 1001 is configured to provide computing and control capabilities to support the operation of the overall temperature control device 10.
The processor 1001 may be a central processing unit (Central Processing Unit, CPU) and may also be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a Field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The general purpose processor may be a microprocessor, or it may be any conventional processor or the like.
In one embodiment, the processor 1001 is configured to execute a computer program stored in the memory 1002, so as to implement the following steps:
When the external power supply supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, determining the battery state of the battery pack; the charging request includes a request for a charging current; wherein the battery pack is detachably connected to the second end of the power conversion unit; if the battery pack is in an overdischarge state, performing power compensation on the requested power supply of the compressor to obtain target power supply; determining a target output current of the power conversion unit according to the battery voltage, the request charging current and the target power supply power of the battery pack; the power conversion unit is controlled to supply power to the compressor and charge the battery pack according to the target output current.
In one embodiment, when implementing power compensation for the requested power supply of the compressor, the processor 1001 is configured to implement:
and adding the requested power supply power with preset compensation power to obtain target power supply.
In one embodiment, the processor 1001 is configured to, when implementing determining the target output current of the power conversion unit according to the battery voltage, the requested charging current, and the target power supply of the battery pack, implement:
determining a target supply current of the compressor according to the battery voltage and the target supply power; and adding the requested charging current and the target power supply current to obtain the target output current of the power conversion unit.
In one embodiment, the temperature control apparatus further comprises a relay for cutting off or turning on the connection between the power conversion unit and the battery pack; the processor 1001 is further configured to, after implementing determining the battery state of the battery pack, implement:
if the battery pack is in an overdischarge state and in an undervoltage state, the control relay disconnects the power conversion unit from the battery pack; when the compressor stops working, the control relay conducts the connection between the power conversion unit and the battery pack.
In one embodiment, the processor 1001 is further configured to, after implementing determining the battery state of the battery pack, implement:
if the battery pack is in an overcharged state, determining a target output voltage according to the battery voltage of the battery pack, wherein the target output voltage is smaller than the battery voltage of the battery pack; the power conversion unit is controlled to output a target output voltage.
In one embodiment, the processor 1001 is further configured to, after implementing controlling the power conversion unit to output the target output voltage:
determining a state of charge of the battery pack; and when the charge state of the battery pack is smaller than the preset charge state, controlling the power conversion unit to charge the battery pack.
In one embodiment, the temperature control apparatus further comprises a relay for cutting off or turning on the connection between the power conversion unit and the battery pack; the processor 1001 is further configured to implement:
When the battery pack is detected to be connected to the temperature control equipment, the output voltage of the power conversion unit is reduced; if the battery pack is in an abnormal state and the compressor is not started, the control relay conducts the connection between the power conversion unit and the battery pack and controls the power conversion unit to charge the battery pack; if the battery pack is in an abnormal state and the compressor is started, the control relay disconnects the power conversion unit from the battery pack.
In one embodiment, the temperature control apparatus further comprises a relay for cutting off or turning on the connection between the power conversion unit and the battery pack; the processor 1001 is further configured to implement:
when the battery pack is detected to be connected to the temperature control equipment, the output voltage of the power conversion unit is reduced; if the battery pack is not in an abnormal state, the relay is controlled to conduct connection between the power conversion unit and the battery pack.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict. Referring to fig. 5, fig. 5 is a schematic flow chart of a charge-discharge control method according to an embodiment of the application. As shown in fig. 5, the charge-discharge control method may include steps S101 to S104.
Step S101, when the external power source supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, determining a battery state of the battery pack, wherein the charging request includes a request for a charging current, and the battery pack is detachably connected to the second end of the power conversion unit.
For example, as shown in fig. 2, when the external power source 20 supplies power to the compressor 11 through the power conversion unit 12, if a charge request of the battery pack 30 is received, the battery state of the battery pack 30 is determined. Wherein the charging request may include requesting a charging current I 1 。
For example, when a charging request transmitted by the BMS system is received, a battery state recorded by the BMS system may be read. The battery state may include, but is not limited to, a normal state, an overdischarge and undervoltage state, or an overcharge state, among others.
It should be noted that, the over-discharge degree of the battery pack in the over-discharge and under-voltage state is higher than that of the battery pack in the over-discharge state, that is, the battery voltage of the battery pack in the over-discharge and under-voltage state is smaller than that of the battery pack in the over-discharge state. For example, if the battery pack can provide 42V to 58V of direct current in the normal state, the battery pack can only provide 38V to 42V of direct current in the over-discharge state, and the battery pack can only provide less than 38V of direct current in the over-discharge and under-voltage state.
By determining the battery status of the battery pack, different operations may be subsequently performed on the battery pack and the compressor according to different battery statuses of the battery pack.
And step S102, if the battery pack is in an over-discharge state, performing power compensation on the requested power supply of the compressor to obtain target power supply.
For example, when the battery pack is in the over-discharge state, the power compensation is performed on the requested power supply of the compressor to obtain the target power supply.
The power compensation refers to increasing preset compensation power on the basis of power supply request. The preset compensation power may be set according to actual situations, and specific values are not limited herein.
In some embodiments, performing power compensation on the requested power supply of the compressor to obtain the target power supply may include: and adding the requested power supply power with preset compensation power to obtain target power supply.
For example, the requested power may be represented as W 1 The preset compensation power may be represented as Δw, and the target power supply power may be represented as W 2 . Wherein W is 2 ＝W 1 +□W。
When the battery pack is in an overdischarged state, for example, when the battery voltage U of the battery pack is between 38V and 42V, the compressor may operate, but a part of the rotational speed may be lost. At this time, the charging current I is requested due to the battery pack 1 Smaller and the requested supply current I of the compressor 11 2 Is a hysteresis current, so in order to respond to possible changes in the rotational speed of the compressor, it is necessary to calculate the target power supply of the compressor, the requested power supply W corresponding to the current rotational speed of the compressor 1 On the basis of (1), adding a preset compensation power DeltaW as a target power supplyPower W 2 To provide a margin against possible rotational speed variations of the compressor.
It will be appreciated that the battery pack requests the charging current I during normal operation of the battery pack 1 The power supply voltage of the compressor is not limited, the working voltage range can be reached, the total power output by the power conversion unit is large enough, and therefore, even the power supply current I is required by the compressor 11 2 Is a hysteresis current, and when the rotation speed of the compressor is possibly changed, the total power output by the power conversion unit can also cope with the change.
In the above embodiment, when the battery pack is confirmed to be in the over-discharge state, the power compensation is performed on the requested power supply of the compressor, so that the target power supply of the compressor is larger than the requested power supply, and thus the possible rotation speed change of the responsive compressor can be realized.
Step S103, determining a target output current of the power conversion unit according to the battery voltage of the battery pack, the requested charging current and the target power supply power.
In some embodiments, after power compensation is performed on the requested power supply of the compressor to obtain the target power supply, the target output current of the power conversion unit may be determined according to the battery voltage of the battery pack, the requested charging current, and the target power supply.
For example, the target output current of the power conversion unit may be calculated according to the battery voltage, the requested charging current, and the target power supply power of the battery pack. Wherein the target output current may be represented as I 3 。
It will be appreciated that the requested power supply of the compressor is determined based on its normal operating voltage and current, i.e. the requested power supply current I of the compressor at this time 2 Is determined based on a request voltage of 42V-58V. When the battery pack is abnormal, the power supply voltage of the compressor is limited by the battery voltage and cannot reach 42V-58V, if the power supply current I still meets the requirement of the compressor at the moment 2 Providing power to the compressor, the compressor will not function properly due to insufficient power. Therefore, at this time, the supplement should be made The compensated target power supply and the actually achievable power supply voltage (i.e. the battery voltage) recalculate the current required by the compressor and calculate the target output current required by the power conversion unit on the basis of this.
According to the embodiment, the target output current of the power conversion unit is determined according to the battery voltage, the request charging current and the target power supply of the battery pack, and the target power supply of the compressor is increased, so that the target output current is larger than the sum of the request charging current and the request power supply current, and further, under the condition that the power supply voltage of the compressor is limited by the abnormal battery pack, the output current of the power conversion unit is increased to increase the power supply current of the compressor, the actual power supply of the compressor is increased, the situation that the power supply of the compressor is far lower than the request power supply due to the limitation of the abnormal battery pack is avoided, and the influence of the battery pack abnormality on the compressor is reduced to the greatest extent.
Step S104, controlling the power conversion unit to supply power to the compressor and charge the battery pack according to the target output current.
In some embodiments, after determining the target output current of the power conversion unit, the power conversion unit may be controlled to power the compressor and charge the battery pack according to the target output current.
For example, the target output current I can be set 3 The control power conversion unit supplies power to the compressor and charges the battery pack.
The target output current I is a result of the target power supply being compensated, and the battery voltage is smaller than the power supply voltage required by the compressor 3 Greater than the requested charging current I 1 And request supply current I 2 And (3) summing. Under the condition that the corresponding resistance values of the compressor and the battery pack are unchanged, the target output current I is based on the same distribution principle 3 The power supply current actually distributed by the compressor is synchronously increased and is larger than the required power supply current I 2 . On the basis, although the power supply voltage of the compressor cannot reach the required working voltage due to the limitation of the abnormal battery pack, the actual power supply does not greatly reach the working voltageDescending, the operation of the compressor can still be maintained.
In this case, the charging current allocated to the battery pack is also larger than the requested charging current I 1 I.e. the actual charging current of the battery pack is greater than the requested charging current I 1 The maintenance time of the battery pack in the over-discharge stage can be shortened to a certain extent, so that the battery pack can be restored to a normal state as soon as possible, and the power supply voltage of the compressor can be quickly restored to the working voltage required by the compressor.
In the above embodiment, by controlling the power conversion unit to supply power to the compressor and charge the battery pack according to the target output current, since the target output current is greater than the sum of the request charging current and the request supply current, the compressor supply current is increased under the condition that the compressor supply voltage is limited by the abnormal battery pack, the actual supply power of the compressor is increased, and the influence of the battery pack abnormality on the compressor is reduced to the greatest extent.
Referring to fig. 6, fig. 6 is a schematic flowchart of a sub-step of determining a target output current provided by an embodiment of the present application, and determining the target output current of the power conversion unit in step S103 may include the following steps S201 and S202.
Step S201, determining a target power supply current of the compressor according to the battery voltage and the target power supply.
For example, a target supply current for the compressor may be determined based on the battery voltage and the target supply power.
For example, the target power supply W corresponding to the compressor may be set 2 Dividing the voltage of the battery with the battery voltage U of the battery pack to obtain the target power supply current I of the compressor 4 。
Since the power supply voltage of the compressor is limited by the battery voltage U of the battery pack, the actual operating voltage of the compressor is equal to the battery voltage U at this time, and the target power supply W is further obtained 2 Dividing the voltage with the battery voltage U to obtain the target power supply current I of the compressor 4 . Wherein the target supply current I 4 Greater than the requested supply current I 2 . It will be appreciated that due to the request for the compressorThe electric power is compensated to obtain target power supply, and the required power supply voltage of the compressor is larger than the battery voltage U, so that the calculated target power supply current I 4 Greater than the requested supply current I of the compressor 2 。
Step S202, adding the requested charging current and the target power supply current to obtain the target output current of the power conversion unit.
Exemplary, in determining the target supply current I for the compressor 4 Thereafter, the charging current I may be requested 1 With the target supply current I 4 Adding to obtain target output current I of the power conversion unit 3 。
As shown in fig. 2 and 3, since the second end of the power conversion unit 12 is connected to the compressor 11 and the second end of the power conversion unit 12 is also connected to the battery pack 30 via the relay 13, the battery pack 30 requests the charging current I 1 With a target supply current I of the compressor 11 4 The target output current I of the power conversion unit 12 can be obtained by addition 3 。
In the above embodiment, the target output current of the power conversion unit may be obtained by determining the target supply current of the compressor according to the battery voltage and the target supply power, and adding the requested charging current to the target supply current.
Referring to fig. 7, fig. 7 is a schematic flowchart of another charge-discharge control method according to an embodiment of the present application, which may include the following steps S301 to S303.
In step S301, when the external power source supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, the battery state of the battery pack is determined, and the charging request includes a request for charging current.
It is understood that step S301 is the same as step S101 described above, and will not be described herein.
Step S302, if the battery pack is in an over-discharge state and in an under-voltage state, the control relay disconnects the power conversion unit from the battery pack.
For example, after determining the battery state of the battery pack, if the battery pack is in an over-discharge state and in an under-voltage state, the control relay disconnects the power conversion unit from the battery pack.
For example, a shutdown signal may be sent to the relay to cause the relay to disconnect the power conversion unit from the battery pack according to the shutdown signal.
It should be noted that, when the battery pack is in the over-discharge state and in the under-voltage state (i.e., the above-mentioned over-discharge and under-voltage state), the battery voltage of the battery pack is far lower than the normal operating voltage of the compressor, for example, the battery voltage is lower than 38V. At this time, the temperature control device is connected to the battery pack in a start-up state, and the compressor is stopped due to abnormal voltage. Therefore, in order to ensure the normal operation of the compressor, when the battery pack in the over-discharge state and in the under-voltage state is connected to the temperature control device, the relay is directly controlled to be disconnected, and the battery pack is not charged.
According to the embodiment, when the battery pack is in the over-discharge state and in the under-voltage state, the control relay is disconnected between the power conversion unit and the battery pack, so that the compressor can be prevented from being stopped due to abnormal voltage, and the temperature control equipment can be ensured to work normally.
Step S303, when the compressor stops working, the control relay conducts the connection between the power conversion unit and the battery pack.
In some embodiments, after confirming that the battery pack is in the over-discharge state and in the under-voltage state, the control relay disconnects the power conversion unit from the battery pack, and when the compressor stops operating, the control relay turns on the connection between the power conversion unit and the battery pack.
For example, a turn-on signal may be sent to the relay such that the relay turns on the connection between the power conversion unit and the battery pack according to the turn-on signal. At this time, the external power source may charge the battery pack via the power conversion unit. The power conversion unit may charge the battery pack according to a request charging current and a request charging voltage of the battery pack.
According to the embodiment, when the compressor stops working, the control relay is connected with the power conversion unit and the battery pack, so that the under-voltage battery pack can be prevented from affecting the normal working of the compressor, and the battery pack can be charged timely, so that the battery pack is prevented from being damaged due to the long-time under-voltage.
Referring to fig. 8, fig. 8 is a schematic flow chart of another charge-discharge control method according to an embodiment of the application, which may include the following steps S401 to S403.
In step S401, when the external power source supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, the battery state of the battery pack is determined, and the charging request includes a request for charging current.
It is understood that step S401 is the same as step S101 described above, and will not be described herein.
Step S402, if the battery pack is in an overcharged state, determining a target output voltage according to the battery voltage of the battery pack, wherein the target output voltage is smaller than the battery voltage of the battery pack.
For example, after determining the battery state of the battery pack, if the battery pack is in an overcharged state, the target output voltage is determined according to the battery voltage of the battery pack. Wherein the target output voltage is less than the battery voltage.
When the battery pack is fully charged, in order to prevent an abnormality from occurring in the overcharge of the battery pack, it is necessary to reduce the target output voltage of the power conversion unit so that the target output voltage is smaller than the battery voltage.
For example, the preset voltage value may be reduced based on the battery voltage of the battery pack to obtain the target output voltage. The preset voltage value may be set according to practical situations, and specific values are not limited herein.
For example, the preset voltage value may be 2V, and if the battery voltage of the battery pack is 59V when the battery pack is in the overcharged state, the target output voltage of the power conversion unit may be adjusted to 57V, and at this time, the power conversion unit may not continue to charge the battery pack.
In the embodiment of the present application, the target output voltage of the power conversion unit is adjusted according to the battery voltage of the battery pack, so that the overcharged battery pack can be prevented from being repeatedly charged. It can be understood that if the target output voltage of the power conversion unit is adjusted according to the requested charging voltage transmitted from the BMS system, since the requested charging voltage is greater than the battery voltage of the battery pack, for example, the requested charging voltage is 61V, the power conversion unit may also charge the battery pack after adjusting the target output voltage to 59V according to the requested charging voltage, thereby causing the case of repeatedly charging the overcharged battery pack. Therefore, when the battery pack is in the overcharged state, the target output voltage is determined directly from the battery voltage.
Step S403, controlling the power conversion unit to output the target output voltage.
For example, after determining the target output voltage according to the battery voltage of the battery pack, the power conversion unit may be controlled to output the target output voltage.
Since the target output voltage output by the power conversion unit is smaller than the battery voltage of the battery pack, the power conversion unit only supplies power to the compressor at this time, and does not charge the battery pack.
In the above embodiment, by determining the target output voltage according to the battery voltage of the battery pack so that the target output voltage is smaller than the battery voltage of the battery pack when the battery pack is confirmed to be in the overcharged state, it is possible to avoid continuing to charge the overcharged battery pack.
Referring to fig. 9, fig. 9 is a schematic flowchart of another charge-discharge control method according to an embodiment of the present application, which may include the following steps S501 to S505.
In step S501, when the external power source supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, the battery state of the battery pack is determined, and the charging request includes a request for charging current.
Step S502, if the battery pack is in an overcharged state, determining a target output voltage according to the battery voltage of the battery pack, wherein the target output voltage is smaller than the battery voltage of the battery pack.
Step S503, controlling the power conversion unit to output the target output voltage.
It is understood that the steps S501 to S503 are the same as the steps S401 to S403, and are not described herein.
Step S504, determining the state of charge of the battery pack.
For example, a State of Charge (SOC) of a battery pack recorded by the BMS system may be read.
Step S505, when the state of charge of the battery pack is less than the preset state of charge, controlling the power conversion unit to charge the battery pack.
It is understood that, after the power conversion unit is controlled to output the target output voltage, since the target output voltage is smaller than the battery voltage of the battery pack, the battery pack discharges the compressor, so that the state of charge of the battery pack gradually decreases.
In some embodiments, the power conversion unit is controlled to charge the battery pack when the state of charge of the battery pack is less than a preset state of charge.
The preset state of charge may be set according to actual conditions, and specific values are not limited herein. For example, if the preset state of charge is 97%, the power conversion unit may be controlled to charge the battery pack when the state of charge of the battery pack is less than 97%. For example, the power conversion unit may be controlled to output a voltage according to a request of the BMS system for charging voltage.
Since the requested charging voltage is greater than the battery voltage of the battery pack, the power conversion unit is controlled to output the voltage according to the requested charging voltage, so that the battery pack can be charged.
According to the embodiment, when the charge state of the battery pack is smaller than the preset charge state, the power conversion unit is controlled to charge the battery pack, so that the battery pack can be charged when the battery pack is in the non-overcharged state, and the battery pack can be effectively prevented from being overcharged abnormally.
Referring to fig. 10, fig. 10 is a schematic flowchart of another charge-discharge control method according to an embodiment of the present application, which may include the following steps S601 to S603.
Step S601, when it is detected that the battery pack is connected to the temperature control device, the output voltage of the power conversion unit is reduced.
Referring to fig. 11, fig. 11 is a schematic flow chart of hot plug of a battery pack according to an embodiment of the present application, and as shown in fig. 11, when it is detected that the battery pack is connected to a temperature control device, the temperature control device may reduce an output voltage of the power conversion unit. For example, the output voltage of the power conversion unit may be reduced to a minimum normal operating voltage of the compressor. When the minimum normal operation voltage of the compressor 11 is 42V, the output voltage of the power conversion unit may be dropped to 42V.
According to the embodiment, when the battery pack is detected to be connected to the temperature control equipment, the output voltage of the power conversion unit is reduced, so that the battery pack is prevented from being impacted by larger current when the battery pack is hot plugged, and the output voltage of the power conversion unit is prevented from being instantaneously pulled down.
Step S602, if the battery pack is in an abnormal state and the compressor is not started, the control relay turns on the connection between the power conversion unit and the battery pack and controls the power conversion unit to charge the battery pack.
In some embodiments, the battery state of the battery pack may be obtained and whether the compressor is started may be detected, and if the battery pack is in an abnormal state and the compressor is not started, the relay is controlled to conduct the connection between the power conversion unit and the battery pack, and the power conversion unit is controlled to charge the battery pack. The abnormal state refers to the battery pack being in an over-discharge state and in an under-voltage state.
As shown in fig. 11, when it is determined that the battery pack is in an abnormal state and the compressor is not started, the relay may be closed and the power conversion unit may be controlled to charge the battery pack. For example, a turn-on signal may be sent to the relay such that the relay turns on the connection between the power conversion unit and the battery pack according to the turn-on signal. And controlling the power conversion unit to charge the battery pack according to the requested charging voltage of the battery pack.
According to the embodiment, when the battery pack is in the abnormal state and the compressor is not started, the relay is controlled to conduct the connection between the power conversion unit and the battery pack and control the power conversion unit to charge the battery pack, so that the battery pack can be quickly charged under the condition that the compressor is not affected, and the battery pack can be restored to be normal as soon as possible.
Step S603, if the battery pack is in an abnormal state and the compressor is started, the control relay disconnects the power conversion unit from the battery pack.
In some embodiments, the control relay disconnects the power conversion unit from the battery pack if the battery pack is in an abnormal state and the compressor is started. The abnormal state refers to the battery pack being in an over-discharge state and in an under-voltage state.
As shown in fig. 11, the relay may be opened when it is determined that the battery pack is in an abnormal state and the compressor is started. For example, a shutdown signal may be sent to the relay such that the relay disconnects the power conversion unit from the battery pack according to the shutdown signal.
In the above embodiment, by disconnecting the power conversion unit from the battery pack by the control relay when it is confirmed that the battery pack is in the over-discharge state and in the under-voltage state and the compressor is started, it is possible to prevent the compressor from being stopped due to the abnormal voltage.
Referring to fig. 12, fig. 12 is a schematic flowchart of another charge-discharge control method according to an embodiment of the present application, which may include the following steps S701 to S702.
Step S701, when it is detected that the battery pack is connected to the temperature control device, the output voltage of the power conversion unit is reduced.
It is understood that step S701 is the same as step S601 described above, and will not be described herein.
In step S702, if the battery pack is not in an abnormal state, the relay is controlled to conduct the connection between the power conversion unit and the battery pack.
In some embodiments, a battery state of the battery pack may be obtained, and if the battery state is not in an abnormal state, the control relay turns on a connection between the power conversion unit and the battery pack.
In this case, the abnormal state means that the battery pack is in an overdischarge state and in an undervoltage state.
As shown in fig. 11, the relay may be closed upon determining that the battery pack is not in an abnormal state. For example, the relay may be controlled to conduct the connection between the power conversion unit and the battery pack when the battery pack is in a normal state, an overdischarge state, or an overcharge state.
In the above embodiment, when the battery pack is confirmed not to be in an abnormal state, the control relay turns on the connection between the power conversion unit and the battery pack, so that hot plug of the battery pack can be realized, and meanwhile, charging of the battery pack not in the abnormal state by the power conversion unit can be also realized.
The embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein the computer program comprises program instructions, and a processor executes the program instructions to realize any one of the charge and discharge control methods provided by the embodiment of the application.
For example, the program is loaded by a processor, and the following steps may be performed:
when the external power supply supplies power to the compressor through the power conversion unit, if a charging request of the battery pack is received, determining the battery state of the battery pack; the charging request includes a request for a charging current; wherein the battery pack is detachably connected to the second end of the power conversion unit; if the battery pack is in an overdischarge state, performing power compensation on the requested power supply of the compressor to obtain target power supply; determining a target output current of the power conversion unit according to the battery voltage, the request charging current and the target power supply power of the battery pack; the power conversion unit is controlled to supply power to the compressor and charge the battery pack according to the target output current.
The computer readable storage medium may be an internal storage unit of the temperature control device of the foregoing embodiment, for example, a hard disk or a memory of the temperature control device. The computer readable storage medium may also be an external storage device of the temperature control device, such as a plug-in hard disk, a Smart Media Card (SMC), a secure digital Card (Secure Digital Card, SD Card), a Flash memory Card (Flash Card) or the like, which are provided on the temperature control device.
Further, the computer-readable storage medium may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, a program required for at least one function, and the like; the storage data area may store data created according to each program, and the like.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. A charge-discharge control method, characterized by being applied to a temperature control apparatus including a compressor and a power conversion unit, a first end of the power conversion unit being for connection to an external power source, a second end of the power conversion unit being connected to the compressor, the method comprising:
when the external power supply supplies power to the compressor through the power conversion unit, if a charging request of a battery pack is received, determining the battery state of the battery pack; the charging request includes a request for a charging current; wherein the battery pack is detachably connected to the second end of the power conversion unit;
If the battery pack is in an overdischarge state, performing power compensation on the requested power supply of the compressor to obtain target power supply;
determining a target output current of the power conversion unit according to the battery voltage of the battery pack, the request charging current and the target power supply power;
and controlling the power conversion unit to supply power to the compressor and charge the battery pack according to the target output current.
2. The charge and discharge control method of claim 1, wherein the power compensating the requested power supply of the compressor to obtain the target power supply includes:
and adding the requested power supply to preset compensation power to obtain the target power supply.
3. The charge-discharge control method according to claim 1, wherein the determining the target output current of the power conversion unit based on the battery voltage of the battery pack, the requested charging current, and the target power supply power includes:
determining a target supply current for the compressor based on the battery voltage and the target supply power;
and adding the request charging current and the target power supply current to obtain the target output current of the power conversion unit.
4. The charge-discharge control method according to claim 1, wherein the temperature control device further includes a relay for cutting off or turning on a connection between the power conversion unit and the battery pack;
after the determining the battery state of the battery pack, the method further includes:
if the battery pack is in an overdischarge state and in an undervoltage state, the relay is controlled to disconnect the power conversion unit from the battery pack;
and when the compressor stops working, controlling the relay to conduct the connection between the power conversion unit and the battery pack.
5. The charge-discharge control method according to claim 1, characterized in that after the determination of the battery state of the battery pack, the method further comprises:
if the battery pack is in an overcharged state, determining a target output voltage according to the battery voltage of the battery pack, wherein the target output voltage is smaller than the battery voltage of the battery pack;
and controlling the power conversion unit to output the target output voltage.
6. The charge-discharge control method according to claim 5, characterized in that after the control of the power conversion unit to output the target output voltage, the method further comprises:
Determining a state of charge of the battery pack;
and when the charge state of the battery pack is smaller than a preset charge state, controlling the power conversion unit to charge the battery pack.
7. The charge-discharge control method according to claim 1, wherein the temperature control device further includes a relay for cutting off or turning on a connection between the power conversion unit and the battery pack; the method further comprises the steps of:
when the battery pack is detected to be connected to the temperature control equipment, the output voltage of the power conversion unit is reduced;
if the battery pack is in an abnormal state and the compressor is not started, controlling the relay to conduct connection between the power conversion unit and the battery pack and controlling the power conversion unit to charge the battery pack;
and if the battery pack is in an abnormal state and the compressor is started, controlling the relay to disconnect the power conversion unit from the battery pack.
8. The charge-discharge control method according to claim 1, wherein the temperature control device further includes a relay for cutting off or turning on a connection between the power conversion unit and the battery pack; the method further comprises the steps of:
When the battery pack is detected to be connected to the temperature control equipment, the output voltage of the power conversion unit is reduced;
and if the battery pack is not in an abnormal state, controlling the relay to conduct connection between the power conversion unit and the battery pack.
9. A temperature control device, wherein the temperature control device comprises a memory and a processor;
the memory is used for storing a computer program;
the processor for executing the computer program and implementing the charge-discharge control method according to any one of claims 1 to 8 when the computer program is executed.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, causes the processor to implement the charge-discharge control method according to any one of claims 1 to 8.
CN202310799781.4A 2023-06-30 2023-06-30 Charge-discharge control method, temperature control device, and readable storage medium Pending CN116826910A (en)

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CN202310799781.4A CN116826910A (en) 2023-06-30 2023-06-30 Charge-discharge control method, temperature control device, and readable storage medium

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