CN116365661A - Charging method, energy storage device and storage medium - Google Patents

Charging method, energy storage device and storage medium Download PDF

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Publication number
CN116365661A
CN116365661A CN202310400442.4A CN202310400442A CN116365661A CN 116365661 A CN116365661 A CN 116365661A CN 202310400442 A CN202310400442 A CN 202310400442A CN 116365661 A CN116365661 A CN 116365661A
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China
Prior art keywords
value
charging voltage
waveform
charging
voltage
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CN202310400442.4A
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Chinese (zh)
Inventor
胡雄
张宏韬
陈熙
王雷
刘玉乾
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Ecoflow Technology Ltd
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Ecoflow Technology Ltd
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Priority to CN202310400442.4A priority Critical patent/CN116365661A/en
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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
    • 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
    • H01M10/446—Initial charging measures
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • 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

Abstract

The application provides a charging method, energy storage equipment and storage medium, relates to the technical field of new energy, and is applied to the energy storage equipment, and the charging method comprises the following steps: detecting the waveform of the charging voltage input by the power supply equipment to obtain waveform parameters of the charging voltage; when the waveform of the charging voltage is determined to be square according to the waveform parameters of the charging voltage, calculating the predicted zero crossing time of the charging voltage according to the waveform parameters of the charging voltage; adjusting the request voltage value sent to the power supply equipment from a first value to a second value within a first preset time period before the zero crossing point time is predicted; the first value is greater than the second value; and recovering the request voltage value sent to the power supply equipment from the second value to the first value within a second preset time period after the zero crossing point time is predicted. According to the embodiment of the application, the charging voltage is prevented from suddenly becoming zero when passing through the zero point, so that the energy storage equipment can identify the working state of the control switch tube after passing through the zero point of the charging voltage, and normal charging is realized.

Description

Charging method, energy storage device and storage medium
Technical Field
The application relates to the technical field of new energy, in particular to a charging method, energy storage equipment and a storage medium.
Background
In the related art, a power supply device supplies alternating current to an energy storage device to charge the energy storage device. After the energy storage device receives the charging voltage of the power supply device, the energy storage device controls the switching tube in the self charging circuit to be switched on or switched off according to the current charging strategy when the charging voltage is near the positive zero crossing point so as to charge by utilizing the alternating current provided by the power supply device.
When the waveform of the charging voltage received by the energy storage device is a square wave, the voltage suddenly becomes zero due to the rapid change of the charging voltage of the square wave. Therefore, the energy storage device is difficult to accurately identify the square wave zero crossing point in a short time, so that the energy storage device cannot timely control the on or off of the switching tube, and cannot charge normally. Meanwhile, the energy storage device is easy to generate current oscillation near the zero crossing point of the square wave, and an overcurrent state is generated.
Disclosure of Invention
In view of this, the application provides a charging method, an energy storage device and a storage medium, so as to solve the problems that the energy storage device cannot accurately identify the zero crossing point of the square wave in a short time, cannot charge, and easily overflows near the zero crossing point of the square wave.
The first aspect of the application provides a charging method applied to energy storage equipment, wherein the energy storage equipment is used for being connected with power supply equipment; the charging method comprises the following steps: detecting the waveform of the charging voltage input by the power supply equipment to obtain waveform parameters of the charging voltage; when the waveform of the charging voltage is determined to be square wave according to the waveform parameters of the charging voltage, calculating the predicted zero crossing time of the charging voltage according to the waveform parameters of the charging voltage; adjusting a request voltage value sent to the power supply equipment from a first value to a second value within a first preset time period before the predicted zero-crossing time; the first value is greater than the second value; and recovering the request voltage value sent to the power supply equipment from the second value to the first value within a second preset time period after the predicted zero-crossing time.
Therefore, the energy storage equipment detects the waveform of the input charging voltage, and after the waveform parameters are obtained, whether the waveform of the charging voltage is a square wave or not can be determined according to the waveform parameters. When the waveform of the charging voltage is a square wave, the request voltage value sent to the power supply equipment is updated, so that the power supply equipment outputs the charging voltage corresponding to the request voltage value. The energy storage equipment calculates the predicted zero crossing time of the charging voltage according to the waveform parameters of the square wave, reduces the request voltage value from a first value to a second value within a first preset time before the predicted zero crossing time, and then sends the request voltage value to the power supply equipment, so that the charging voltage provided by the power supply equipment can reduce the voltage value before the zero crossing, namely, the waveform of the square wave is changed, and the charging voltage is prevented from suddenly becoming zero at the zero crossing. The energy storage equipment can identify the zero crossing point of the charging voltage according to the changed square wave so as to control the switching tube to work and realize normal charging. Meanwhile, by changing the waveform of the square wave before the zero crossing point, the overcurrent state of the energy storage device generated when the square wave crosses the zero point is avoided. And finally, recovering the request voltage value from the second value to the first value within a second preset time period after the zero crossing point time is predicted, and sending the recovered request voltage value to the power supply equipment so as to indicate the charging voltage of the power supply equipment to recover to the normal voltage value and charge the energy storage equipment.
In some embodiments of the first aspect, the waveform parameters include a period of the charging voltage and a historical zero crossing time, and the calculating the predicted zero crossing time of the charging voltage from the waveform parameters of the charging voltage includes: and determining the predicted zero crossing time of the charging voltage according to the period and the historical zero crossing time of the charging voltage.
In some embodiments of the first aspect, the adjusting the value of the request voltage sent to the power supply device from the first value to the second value within the first preset time period before the predicted zero-crossing time includes: and gradually reducing the request voltage value sent to the power supply equipment from the first value to the second value according to a preset decreasing function within a first preset duration before the predicted zero-crossing time.
In some embodiments of the first aspect, the second value is zero.
In some embodiments of the first aspect, the restoring the request voltage value sent to the power supply device from the second value to the first value within the second preset time period after the predicted zero-crossing time includes: and gradually increasing the request voltage value sent to the power supply equipment from the second value to the first value according to a preset increasing function within a second preset time period after the predicted zero-crossing time.
In some embodiments of the first aspect, the waveform parameters include a peak value, an effective value, and a zero crossing slope; the determining that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage includes: when the waveform parameters of the charging voltage are matched with the waveform parameters of a preset square wave model, determining that the waveform of the charging voltage is a square wave; or when the difference value between the peak value of the charging voltage and the effective value of the charging voltage is smaller than a preset deviation threshold value, determining that the waveform of the charging voltage is a square wave; or when the zero crossing slope of the charging voltage is larger than a preset slope threshold value, determining that the waveform of the charging voltage is a square wave.
In some embodiments of the first aspect, before the waveform detection of the charging voltage input to the power supply device, the charging method further includes: and filtering the collected data of the charging voltage.
Therefore, the collected data of the charging voltage is filtered, interference data in the data can be reduced, and accuracy of the collected data of the charging voltage is improved.
In some embodiments of the first aspect, when the waveform of the charging voltage is determined to be a square wave according to the waveform parameter of the charging voltage, the charging method further includes: and closing a bypass output switch of the energy storage device.
Therefore, the alternating current provided by the power supply equipment can be prevented from directly flowing to the alternating current load, and the phenomenon that the alternating current load cannot work normally because square waves cannot be identified is avoided.
A second aspect of the present application provides an energy storage device comprising: a memory and a processor; the processor is configured to execute a computer program or instructions stored in the memory to implement the charging method described above.
A third aspect of the present application provides a storage medium having stored thereon at least one computer instruction loaded by a processor and configured to perform the charging method described above.
The advantageous effects of the second and third aspects of the present application are similar to those of the first aspect, and are not described in detail here.
Drawings
Fig. 1 is an application scenario diagram of a charging method according to an embodiment of the present application.
Fig. 2 is a flow chart of a charging method according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the square wave variation trend of the related art.
Fig. 4 is a schematic diagram of waveform variation trend of a charging method according to an embodiment of the present application.
Fig. 5 is a waveform change trend diagram of a charging method according to another embodiment of the present application.
Fig. 6 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an energy storage device according to another embodiment of the present application.
Detailed Description
It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.
It should be further noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart, including one or more steps for implementing the method, may be performed in an order that the steps may be interchanged with one another, and some steps may be deleted without departing from the scope of the claims.
The following embodiments and features of the embodiments may be combined with each other without conflict.
The following briefly describes the case of the related art:
the power supply device outputs a charging electrical signal to the energy storage device, the charging point electrical signal including a charging voltage and a charging current. After the energy storage equipment receives the charging point electric signal provided by the power supply equipment, the energy storage equipment controls the on or off of a switching tube in a self charging circuit according to the current charging strategy when the charging voltage of the power supply equipment is near a positive zero crossing point so as to charge by using the charging electric signal.
Due to the different types of power supply devices, the waveforms of the charging voltages provided by the power supply devices to the energy storage devices are also different. For example, when the power supply device is mains, a more standard sine wave waveform can be provided to the energy storage device. When the power supply devices are diesel generators, gas generators, vehicle generators, solar power modules, fans, and the like, if the specifications of the inverters of these power supply devices are not standard enough, the waveform of the charging voltage output to the energy storage device is not a more standard sine wave, and may be a square wave. When the waveform of the charging voltage received by the energy storage device is a square wave, the voltage suddenly becomes zero when the waveform of the square wave changes due to the fact that the square wave only has a high state and a low state. Therefore, the energy storage device is difficult to accurately identify the square wave zero crossing point in a short time, so that the energy storage device cannot timely control the working state of the switching tube, and the energy storage device cannot be charged normally. Meanwhile, harmonic interference of the square wave can cause current oscillation to occur near a zero crossing point of the energy storage device, and even an overcurrent state is generated.
In view of this, the application provides a charging method, an energy storage device and a storage medium, which can timely and correctly identify the zero crossing point of the square wave under the condition that the waveform of the input charging voltage is the square wave, so as to charge by using the charging voltage, and avoid the generation of an overcurrent state.
Referring to fig. 1, fig. 1 is an application scenario diagram of a charging method according to an embodiment of the present application, where the charging method may be applied to an electronic device, and the electronic device may include an energy storage device 100, a vehicle, a mobile phone, a computer, and the like. In the embodiment of the present application, the energy storage device 100 is taken as an example, and a charging method is described.
The energy storage device 100 is electrically connected to the power supply device 200. The power supply apparatus 200 includes a diesel generator, a gas generator, a vehicle-mounted generator, a solar power generation module, a blower, and the like. After the power supply device 200 supplies power to the energy storage device 100, the energy storage device 100 performs waveform detection on the charging voltage input by the power supply device 200 to obtain waveform parameters of the charging voltage. Next, after the energy storage device 100 determines that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage, the power supply device 200 is sent with the request voltage value updated according to the waveform parameter. The power supply device 200 outputs a charging voltage to the energy storage device 100 according to the request voltage value, and the energy storage device 100 controls the working state of a switching tube in a self-charging circuit according to the charging voltage so as to realize normal charging. The switching transistor includes an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
The step of the energy storage device 100 transmitting the request voltage value updated according to the waveform parameter to the power supply device 200 includes: first, the energy storage device 100 calculates a predicted zero crossing time of the charging voltage according to the waveform parameters of the charging voltage. And adjusting the request voltage value from the first value to a second value smaller than the first value within a first preset time period before the zero crossing time is predicted, and transmitting the adjusted request voltage value to the power supply device 200. Next, the request voltage value is restored from the second value to the first value within a second preset time period after the zero-crossing time is predicted, and the first value is transmitted as the request voltage value to the power supply apparatus 200.
It can be appreciated that the energy storage device 100 detects the waveform of the input charging voltage, and after obtaining the waveform parameter, it can determine whether the waveform of the charging voltage is a square wave according to the waveform parameter. When the waveform of the charging voltage is a square wave, a request voltage value updated according to the waveform parameter is transmitted to the power supply apparatus 200, so that the power supply apparatus 200 inputs the charging voltage corresponding to the request voltage value to the energy storage apparatus 100. The energy storage device calculates a predicted zero crossing time of the charging voltage according to the waveform parameter of the square wave, and then adjusts the request voltage value from a first value to a second value smaller than the first value within a first preset time before the predicted zero crossing time, and then sends the request voltage value to the power supply device 200, so that the value of the charging voltage input into the energy storage device 100 by the power supply device can be reduced before the zero crossing. The method can change the waveform of the square wave, avoid the charging voltage from suddenly changing to zero when the charging voltage crosses zero, enable the energy storage device 100 to identify the working state of the switching tube after the charging voltage, and realize normal charging. Meanwhile, the overcurrent state generated by the square wave at the zero crossing point is avoided. Finally, the request voltage value is restored from the second value to the first value within a second preset time period after the zero crossing point time is predicted, and the restored request voltage value is sent to the power supply device 200, so that the value of the charging voltage provided by the power supply device 200 is restored to the first value, and the energy storage device 100 is normally charged.
It can be appreciated that the waveform of the charging voltage input to the energy storage device 100 by the power supply device 200 may be more than one, and after the energy storage device 100 performs the charging method according to the embodiment of the present application, the square wave component in the waveform may be identified, and the waveform of the square wave may be adjusted to achieve normal charging.
Referring to fig. 2, fig. 2 is a flow chart of a charging method according to an embodiment of the present application, and the charging method of the present application may be applied to the energy storage device 100. The charging method comprises the following steps:
step S101: and detecting the waveform of the charging voltage input by the power supply equipment to obtain waveform parameters of the charging voltage.
The power supply device 200 is electrically connected to the energy storage device 100, the power supply device 200 supplies power to the energy storage device 100, and the energy storage device 100 receives a charging voltage input from the power supply device 200. The waveform of the charging voltage is various, such as square wave, sine wave, rectangular wave, triangular wave, saw tooth wave, etc. The energy storage device 100 may extract the waveform parameters of the charging voltage according to a correlation algorithm. The waveform parameters can determine which waveform of the charging voltage is. For example, the waveform of the charging voltage may be determined to be a square wave according to a certain waveform parameter, and the waveform of the charging voltage may be determined to be a sine wave according to another waveform parameter.
It will be appreciated that the waveform of the charging voltage output to the energy storage device 100 may be affected due to the different components used by the power supply device 200. Accordingly, the energy storage device 100 may first perform waveform detection on the charging voltage to determine whether the waveform of the input charging voltage is a square wave or not, or the waveform package of the charging voltage does not include a square wave.
Step S102: when the waveform of the charging voltage is determined to be a square wave according to the waveform parameters of the charging voltage, calculating the predicted zero crossing time of the charging voltage according to the waveform parameters of the charging voltage.
The zero crossing point means a time when the charging voltage decreases to zero, and the predicted zero crossing point time means a time when the charging voltage decreases to zero.
Step S103: adjusting the request voltage value sent to the power supply equipment from a first value to a second value within a first preset time period before the zero crossing point time is predicted; the first value is greater than the second value.
The first preset duration and the second value may be preset. The requested voltage value refers to a charging voltage that the energy storage device 100 requests the power supply device 200 to output.
As will be appreciated, the energy storage device adjusts the requested voltage value from a first value to a second value less than the first value within a first preset time period prior to predicting the zero crossing time and then transmits the adjusted requested voltage value to the power supply device 200. The power supply device 200 outputs the charging voltage according to the request voltage value, so that the charging voltage input to the energy storage device is gradually reduced before the zero crossing point, the situation that the charging voltage suddenly becomes zero when the zero crossing point is avoided, and the energy storage device 100 can accurately identify the working state of the switching tube after the zero crossing point of the charging voltage, thereby realizing charging. Meanwhile, the overcurrent condition generated when the square wave is in the zero crossing point is avoided.
Step S104: and recovering the request voltage value sent to the power supply equipment from the second value to the first value within a second preset time period after the zero crossing point time is predicted.
The second preset time period may be preset. It is understood that the request voltage value is restored from the second value to the first value within the second preset time period after the zero-crossing time is predicted, and the restored request voltage value is transmitted to the power supply apparatus 200. The power supply apparatus 200 outputs a charging voltage to the energy storage apparatus 100 according to the request voltage value, so that the power supply apparatus 200 continues to supply power to the energy storage apparatus 100.
In some embodiments, the waveform parameters include a period of the charging voltage and a historical zero crossing time.
The charging voltage has a corresponding waveform. For example, when the waveform of the charging voltage is a square wave, t is as shown in fig. 3 0 To t 2 Represents one period of the charging voltage, from t 2 To t 4 For another period of the charging voltage, therefore, t 0 To t 2 Or t 2 To t 4 All refer to one period T of the charging voltage.
The historical zero-crossing time refers to a time of zero crossing of the charging voltage output to the energy storage device 100 before the power supply device 200 receives the request voltage value, that is, a time of zero crossing after the charging voltage is input to the energy storage device 100 in the related art. For example, as shown in FIG. 3, a square wave with a historical zero crossing time of t 0 、t 1 、t 2 、t 3 Or t 4 。
In some embodiments, the waveform parameters further include a pulse width of the charging voltage from which a period of the charging voltage may be determined.
For example, when the waveform is a square wave, the positive half-wave pulse width M and the negative half-wave pulse width M have the same value, and thus the period t=2×m of the charging voltage can be calculated.
In some embodiments, step S102 includes:
step S201: and determining the predicted zero crossing time of the charging voltage according to the period of the charging voltage and the historical zero crossing time.
It is understood that the period T of the charging voltage to be output by the power supply apparatus 200 according to the request voltage value is the same. Therefore, after the historical zero-crossing time is acquired, the predicted zero-crossing time can be calculated from the historical zero-crossing time and the period T. For example, as shown in FIG. 3, the historical zero crossing time is t 0 Period T is T 0 To t 2 Predicting zero crossing time t Pre-preparation ＝t 3 。
In some embodiments, step S103 includes the steps of:
step S301: and gradually reducing the request voltage value sent to the power supply equipment from a first value to a second value according to a preset decreasing function within a first preset duration before the zero crossing time is predicted.
The calculation formula of the first preset duration is as follows:
W 1 ＝S 1 ×T
wherein W is 1 Representing a first preset time period, S 1 Representing a first preset proportion S 1 May be a value of less than 1, such as 0.1, 0.25, or 0.3, and T represents the period of the charging voltage.
It will be appreciated that a first preset ratio S of less than 1 1 After multiplying by the period T of the charging voltage, a first preset duration W smaller than the period T can be obtained 1 . Since the first preset time period is smaller than the period T, waveform adjustment of the charging voltage in each period can be achieved.
The preset decreasing function refers to a function capable of gradually decreasing the value of the excess realization voltage, and the function includes a primary function, a secondary function, a power function, an exponential function, a logarithmic function and the like, and is not limited herein.
It will be appreciated that the energy storage device 100 may gradually decrease the requested voltage value from the first value to the second value using a decreasing function, such that the charging voltage is gradually decreased by a decreasing magnitude of a given value until the zero crossing point, and the charging voltage has a second value smaller than the first value. Before the zero crossing of the charging voltage, the value of the voltage is slowly reduced, so that the energy storage device 100 can have more sufficient time to identify the charging voltage, the zero crossing of the charging voltage is easier to identify, and meanwhile, the occurrence of an overcurrent condition is reduced.
In some embodiments, the second value is zero.
As can be appreciated, since the energy storage device 100 controls the switching tube and the load to perform related actions according to the zero crossing point of the charging voltage, the value of the charging voltage is reduced to zero during zero crossing, and the sealing is implemented, so as to realize the normal control of the energy storage device 100 on other components.
In some embodiments, step S104 includes the steps of:
step S401: and gradually increasing the request voltage value sent to the power supply equipment from the second value to the first value according to a preset increasing function within a second preset duration after the zero crossing time is predicted.
The calculation formula of the second preset time length is as follows:
W 2 ＝S 2 ×T
wherein W is 2 Representing a second preset time period, S 2 Representing a second preset proportion S 2 May be a value of less than 1, such as 0.1, 0.25, or 0.3, and T represents the period of the charging voltage.
It will be appreciated that, in the same way, a second preset ratio S of less than 1 2 After multiplying by the period T of the charging voltage, a second preset duration W smaller than the period T can be obtained 2 . Due to the second preset time length W 2 Less than period T, the energy storage device 100 may thus enable waveform adjustment of the charging voltage within each period.
In some embodiments, the first preset ratio S 1 Is equal to the second preset proportion S 2 . Thus, the second preset time period W 2 The value of (2) is equal to the first preset time length W 1 。
The preset increasing function refers to a function capable of gradually increasing the value of the excess realization voltage, and the function includes a primary function, a secondary function, a power function, an exponential function, a logarithmic function and the like, and is not limited herein.
It will be appreciated that at zero crossing, the energy storage device 100 reduces the value of the charging voltage to zero, followed by a gradual increase in the requested voltage value from the second value to the second value using an incremental function for a second preset period of time. The charging voltage input by the power supply apparatus 200 may be gradually increased in an incremental amplitude of a given value after the zero crossing until the value of the charging voltage is restored to the first value. The energy storage device 100 controls the charging voltage to slowly increase after the zero crossing point so that the energy storage device 100 can be charged normally.
In one example, energy storage device 100 steps down the requested voltage value sent to power supply device 200 from a first value to zero according to a preset decreasing function for a first preset duration prior to the predicted zero crossing time. During a second preset time period after predicting the zero crossing time, energy storage device 100 steps up the requested voltage value sent to power supply device 200 from the second value to the first value according to a preset increasing function. The power supply apparatus 200 outputs the charging voltage according to the requested voltage value of the energy storage apparatus 100. The waveform of the charging voltage is shown in fig. 4, and so on, the waveform change of the charging voltage over two periods is shown in fig. 5.
It will be appreciated that prior to the zero crossing, the energy storage device 100 requests the power supply device 200 to slowly decrease the output charging voltage. After the zero crossing point, the energy storage device 100 requests the power supply device 200 to slowly increase the output charging voltage, so that the current of the charging point electric signal output to the energy storage device 100 near the zero crossing point can be ensured not to oscillate, and thus, no overcurrent phenomenon can be generated, the energy storage device can be normally charged after the zero crossing point, and the energy storage device 100 can be ensured to be stably charged.
In some embodiments, the waveform parameters further include a peak value, an effective value, and a zero crossing slope.
The waveform parameters also include the voltage peak value, the voltage effective value, and the zero crossing slope of the waveform. For example, as shown in fig. 3, the voltage peak of the square wave is a first value, and the effective voltage value can be obtained according to the first value, the pulse width and the frequency of the square wave. The zero crossing slope of the square wave is about zero.
In some embodiments, step S101 includes the steps of:
step 501: when the waveform parameters of the charging voltage are matched with the waveform parameters of the preset square wave model, determining that the waveform of the charging voltage is square wave.
A plurality of preset square wave models may be created in the database of the energy storage device 100 using waveform parameters that may determine square waves. For example, the preset square wave model may be formulated as f (X) = (Vpeak, vrms, PWM), where f (X) represents the preset square wave model, vpeak represents the peak value of the square wave, vrms represents the effective value of the square wave, and PWM represents the pulse width of the square wave. When the peak value, the effective value and the pulse width of the charging voltage are matched with the peak value, the effective value and the pulse width of a preset square wave model, the waveform of the charging voltage can be determined to be square wave.
In some embodiments, step S101 further comprises: based on a preset function, determining the absolute value of a waveform model of the charging voltage and a preset square wave model, and if the absolute value is smaller than a model deviation threshold value, determining the waveform of the charging voltage as a square wave.
Because of the deviation between the models of different waveforms, waveform parameters can be utilized to build a waveform model. And comparing the deviation between the waveform model and a preset square wave model, and determining the charging voltage as a square wave when the deviation is smaller than a certain range.
In one example, the absolute value is determined by the formula error=abs|f (x 1) -f (x) |, where error represents the absolute value, f (x 1) represents the waveform model of the charging voltage, f (x) represents the preset square wave model, and abs||represents the function of taking the absolute value. The formula shows that the absolute value of the difference between the waveform model of the charging voltage and the preset square wave model can be obtained according to the abs function. The model deviation threshold is a threshold obtained according to the deviation of the waveform models of different waveforms, and the deviation threshold is close to zero. When the absolute value is smaller than the model deviation threshold, it may be determined that the waveform of the charging voltage is a square wave.
In some embodiments, step S101 further comprises:
step S601, when the difference between the peak value of the charging voltage and the effective value of the charging voltage is smaller than a preset deviation threshold value, determining that the waveform of the charging voltage is a square wave.
And analyzing a plurality of waveform parameters of the charging voltage, and if the analysis result accords with the characteristics of the square wave, determining that the waveform of the charging voltage is the square wave.
For example, since the peak value of the square wave is closer to the effective value of the square wave, a predetermined deviation threshold may be obtained based on the difference between the peak value of the square wave and the effective value of the square wave. For example, the preset deviation threshold is equal to the difference, or the preset deviation threshold is less than the difference. When the difference between the peak value of the waveform and the effective value of the waveform is smaller than the preset deviation threshold value, the waveform can be confirmed to be square wave.
In some embodiments, step S101 further comprises: and when the difference value between the average value of the charging voltage and the effective value of the charging voltage is smaller than the deviation threshold value, determining that the waveform of the charging voltage is a square wave.
Similarly, the average value of the square wave is closer to the effective value of the square wave, so that a deviation threshold can be obtained according to the difference value of the average value of the square wave and the effective value of the square wave as a reference, and when the difference value of the average value of the waveform and the effective value of the waveform is smaller than the deviation threshold, the waveform can be confirmed to be the square wave.
In some embodiments, step S101 further comprises:
step S701, when the zero crossing slope of the charging voltage is larger than a preset slope threshold, determining that the waveform of the charging voltage is a square wave.
Because the slope of the square wave at the zero crossing point is larger than the slope of the zero crossing points of other waveforms, a preset slope threshold value which can represent the zero crossing point of the square wave can be set. When the zero crossing slope of the charging voltage is greater than the preset slope threshold, the waveform of the charging voltage can be determined to be a square wave.
In some embodiments, before the waveform detection of the charging voltage input by the power supply device, the charging method further includes the steps of:
step S801: and filtering the collected data of the charging voltage.
There are various ways of filtering data, such as a sliding window method for acquiring data of a charging voltage, an arithmetic average filtering method, a median filtering method, and the like. It can be understood that filtering the collected data of the charging voltage can reduce interference data in the data and improve accuracy of the collected data of the charging voltage.
In some embodiments, after determining that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage, the charging method further includes the steps of:
step S901: and closing a bypass output switch of the energy storage device.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an energy storage device 100, where the energy storage device 100 includes a rectifying unit 110, an inverting unit 140, a voltage converting unit 120, a battery 102, and a bypass output switch 150. One end of the rectifying unit 110 is electrically connected to the power supply device 200, and the other end is electrically connected to the inverter unit 140. The other end of the inverter unit 140 is electrically connected to the ac load 300. One end of the bypass output switch 150 is electrically connected to a connection terminal of the power supply apparatus 200 and the rectifying unit 110, and the other end is electrically connected to a connection terminal of the inverter unit 140 and the ac load 300. The connection terminals of the rectifying unit 110 and the inverting unit 140 are electrically connected to one end of the voltage converting unit 120, and the other end of the voltage converting unit 120 is electrically connected to the battery 102. The rectifying unit 110 includes a rectifier, the inverting unit 140 includes an inverter, and the voltage converting unit 120 includes a DC/DC converter.
When the power supply device 200 supplies power to the energy storage device 100, if the energy storage device 100 is not connected to the ac load 300, the ac power supplied by the power supply device 200 is converted into dc power by the rectifying unit 110, the dc power is converted into dc power by the voltage converting unit 120, the voltage of the charging voltage of the dc power is increased or decreased, and finally the battery 102 is charged. If the battery 102 supplies power to the ac load 300, the dc power output from the battery 102 is increased or decreased by the voltage conversion unit 120, and the inverter unit 140 converts the dc power into ac power to supply power to the ac load 300.
When the power supply device 200 supplies power to the energy storage device 100, the energy storage device 100 turns off or turns on the bypass output switch 150 according to the power supply condition of the power supply. If the energy storage device 100 turns off the bypass output switch 150, the ac power supplied from the power supply device 200 cannot directly flow to the ac load 300. Therefore, when the energy storage device 100 determines that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage, the bypass output switch 150 is turned off, so that the ac power provided by the power supply device 200 can be prevented from directly flowing to the ac load 300, and damage to the ac load is avoided.
In some embodiments, after step 101, the charging method further comprises: when the waveform of the charging voltage is determined not to be square wave according to the waveform parameters of the charging voltage, the charging voltage is not adjusted.
As can be appreciated, when the energy storage device 100 detects that the charging voltage is not a square wave, the energy storage device 200 can normally receive the charging electric signal of the power supply device 200 to perform charging without instructing the power supply device 200 to adjust the waveform of the charging voltage output by the power supply device.
Fig. 7 is a schematic diagram of an energy storage device 100 according to an embodiment of the present application. In one embodiment of the present application, the energy storage device 100 includes a memory 31, at least one processor 32, at least one communication bus 33, and a battery 102.
It will be appreciated by those skilled in the art that the configuration of the energy storage device 100 illustrated in fig. 7 is not limiting of the embodiments of the present application, and that the energy storage device 100 may also include additional hardware or software, more or less than illustrated, or a different arrangement of components. For example, the energy storage device 100 may also include a plurality of interfaces, a first interface for accessing a load to power the load. The second interface is used to access the independent battery 102 to increase the capacity of the energy storage device 100.
In some embodiments, the memory 31 has stored therein a computer program which, when executed by the at least one processor 32, performs all or part of the steps of the charging method as described for the battery 102. The Memory 31 includes Read-Only Memory (ROM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable rewritable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic tape Memory, or any other medium that can be used for a computer readable medium that carries or stores data.
The present application also provides a computer-readable storage medium, which may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function, and the like; the storage data area may store data created from the use of the energy storage device 100, etc.
In some embodiments, at least one processor 32 is a Control Unit (Control Unit) of the energy storage device 100 that interfaces and lines with various components of the overall energy storage device 100, by running or executing programs or modules stored in memory 31, and invoking data stored in memory 31 to perform various functions of the energy storage device 100 and process data. For example, at least one processor 32, when executing computer programs stored in memory, implements all or part of the steps of the charging methods in embodiments of the present application; or to perform all or part of the functions of the battery 102 pack heating duration determining apparatus. The at least one processor 32 may be comprised of integrated circuits, such as a single packaged integrated circuit, or may be comprised of multiple integrated circuits packaged with the same or different functionality, including one or more central processing units (Central Processing unit, CPU), microprocessors, digital processing chips, graphics processors, a combination of various control chips, and the like.
In some embodiments, at least one communication bus 33 is provided to enable connected communication between the memory 31 and the at least one processor 32 or the like.
Although not shown, the energy storage device 100 may also include a battery 102 for powering the various components, preferably the battery 102 may be logically connected to the at least one processor 32 by a power supply 200 management device to perform functions such as managing charging, discharging, and power consumption by the power supply 200 management device.
The energy storage device 100 may also include one or more of any components, such as a direct current or alternating current power source, recharging device, power failure detection circuit, power converter or inverter, power status indicator, etc. The energy storage device 100 may further include various sensors, bluetooth modules, wi-Fi modules, etc., which are not described herein.
The integrated units implemented in the form of software functional modules described above may be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium that includes instructions for causing an energy storage device 100 or controller (processor) to perform portions of the methods of various embodiments of the present application.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of modules is merely a logical function division, and other manners of division may be implemented in practice.
The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units can be realized in a form of hardware or a form of hardware and a form of software functional modules.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A charging method, characterized by being applied to an energy storage device for connection with a power supply device; the charging method comprises the following steps:
detecting the waveform of the charging voltage input by the power supply equipment to obtain waveform parameters of the charging voltage;
when the waveform of the charging voltage is determined to be square wave according to the waveform parameters of the charging voltage, calculating the predicted zero crossing time of the charging voltage according to the waveform parameters of the charging voltage;
adjusting a request voltage value sent to the power supply equipment from a first value to a second value within a first preset time period before the predicted zero-crossing time; the first value is greater than the second value;
and recovering the request voltage value sent to the power supply equipment from the second value to the first value within a second preset time period after the predicted zero-crossing time.
2. The charging method of claim 1, wherein the waveform parameters include a period and a historical zero crossing time of the charging voltage, and wherein calculating the predicted zero crossing time of the charging voltage from the waveform parameters of the charging voltage comprises:
and determining the predicted zero crossing time of the charging voltage according to the period and the historical zero crossing time of the charging voltage.
3. The charging method according to claim 1, wherein the adjusting the value of the request voltage sent to the power supply device from the first value to the second value within the first preset time period before the predicted zero-crossing time includes:
and gradually reducing the request voltage value sent to the power supply equipment from the first value to the second value according to a preset decreasing function within a first preset duration before the predicted zero-crossing time.
4. A charging method according to claim 3, wherein the second value is zero.
5. A charging method according to claim 3, wherein the restoring the requested voltage value sent to the power supply device from the second value to the first value within the second preset time period after the predicted zero-crossing time includes:
and gradually increasing the request voltage value sent to the power supply equipment from the second value to the first value according to a preset increasing function within a second preset time period after the predicted zero-crossing time.
6. The charging method of claim 1, wherein the waveform parameters include a peak value, an effective value, and a zero crossing slope; the determining that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage includes:
when the waveform parameters of the charging voltage are matched with the waveform parameters of a preset square wave model, determining that the waveform of the charging voltage is a square wave; or (b)
When the difference value between the peak value of the charging voltage and the effective value of the charging voltage is smaller than a preset deviation threshold value, determining that the waveform of the charging voltage is a square wave; or (b)
And when the zero crossing slope of the charging voltage is larger than a preset slope threshold value, determining that the waveform of the charging voltage is a square wave.
7. The charging method according to claim 1, wherein the charging method further comprises, prior to the waveform detection of the charging voltage input to the power supply apparatus:
and filtering the collected data of the charging voltage.
8. The charging method according to claim 1, wherein after determining that the waveform of the charging voltage is a square wave according to the waveform parameter of the charging voltage, the charging method further comprises:
and closing a bypass output switch of the energy storage device.
9. An energy storage device, comprising:
a memory and a processor; the processor is configured to execute a computer program or instructions stored in the memory to implement the charging method according to any one of claims 1-8.
10. A storage medium having stored thereon at least one computer instruction, wherein the computer instructions are loaded by a processor and are used to perform the charging method according to any of claims 1-8.
CN202310400442.4A 2023-04-10 2023-04-10 Charging method, energy storage device and storage medium Pending CN116365661A (en)

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CN202310400442.4A CN116365661A (en) 2023-04-10 2023-04-10 Charging method, energy storage device and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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