CN115663939A - Charging control method, charging control device, power conversion device, and medium - Google Patents
Charging control method, charging control device, power conversion device, and medium Download PDFInfo
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Abstract
The present application relates to the field of energy technology, and in particular, to a charging control method, a charging control apparatus, a power conversion apparatus, and a medium. The charging control method comprises the following steps: acquiring the access state of an external power supply; when the access state indicates that the external power supply is accessed, monitoring the working state of the battery pack, wherein the working state comprises a charging state and a standby state; when the working state is monitored to be converted from the charging state to the standby state, acquiring a voltage parameter and a charging protection parameter of the battery pack; and when the voltage parameter is greater than a preset voltage threshold value and the charging protection parameter does not meet a preset protection condition, outputting a charging stopping instruction to the power conversion circuit so as to control the power conversion circuit to stop outputting a charging current to the battery pack. The charging control method can timely judge that the battery pack belongs to a charging overvoltage state, and avoids the situation that the battery pack is repeatedly charged under the overvoltage state.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a battery pack charging control method, a battery pack charging control device, a power conversion device and a medium.
Background
For many energy storage products on the market, the hardware protection circuit board directly connected to the BATTERY pack is usually a pure hardware control, and the circuit board is used for controlling the on/off of the charging and discharging circuit of the BATTERY pack, and is also commonly referred to as a BMS (BATTERY MANAGEMENT SYSTEM) board. However, in order to save costs, such BMS boards do not have a micro control unit MCU for operating a software algorithm, and a control chip for operating a software algorithm, such as a BMS chip, is integrated on other circuit boards, such as a power conversion circuit board electrically connected to the BMS board. It can be understood that in battery protection, the control chip is used to trigger software protection, and the BMS circuit board automatically triggers hardware protection.
In the practical application process, the battery core overvoltage information of the battery pack in the charging process often cannot synchronously trigger software protection and hardware protection in time, so that repeated charging of the battery pack is easily caused, and the battery pack is damaged.
Therefore, how to detect the overvoltage state of the battery pack in time in the charging process so as to avoid repeated charging of the battery pack is a difficult problem to be solved urgently in the technical field of new energy at present.
Disclosure of Invention
The invention mainly aims to provide a charging control method, a charging control device, a power conversion device and a medium, aiming at avoiding the situation that a battery pack is repeatedly charged after the battery pack enters an overvoltage state by monitoring the state conversion of the battery pack in the charging process and judging whether the battery pack belongs to a charging overvoltage state according to the voltage parameter and the charging protection parameter of the battery pack.
According to an aspect of an embodiment of the present application, a charging control method is disclosed, including:
acquiring the access state of an external power supply;
when the access state indicates that the external power supply is accessed, monitoring the working state of the battery pack, wherein the working state comprises a charging state and a standby state;
when the working state is monitored to be converted from the charging state to the standby state, acquiring voltage parameters and charging protection parameters of the battery pack;
and when the voltage parameter is greater than a preset voltage threshold value and the charging protection parameter does not meet a preset protection condition, outputting a charging stopping instruction to the power conversion circuit so as to control the power conversion circuit to stop outputting a charging current to the battery pack.
In some embodiments of the present application, based on the above technical solution, the voltage parameter is a cell average voltage, the battery pack includes a plurality of cells, and the obtaining the voltage parameter of the battery pack includes:
detecting a current total voltage of the battery pack;
and calculating the average voltage of the battery cells according to the current total voltage of the battery pack and the number of the battery cells.
In some embodiments of the present application, based on the above technical solutions, the obtaining the charging protection parameter of the battery pack includes:
detecting a charging temperature and a charging current of the battery pack during charging to determine the battery charging parameters;
detecting the working state of the power conversion circuit board to determine the charging fault parameter;
when the charging fault parameter is matched with a preset fault code, or when the battery charging parameter is greater than or equal to a preset charging protection threshold value, the charging protection parameter is confirmed to meet a preset protection condition.
In some embodiments of the application, based on the above technical solution, when the voltage parameter is greater than a preset voltage threshold and the charging protection parameter does not satisfy a preset protection condition, outputting a charging stop instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack, includes:
acquiring overvoltage detection time;
within the overvoltage detection duration, if the voltage parameter is continuously greater than a preset threshold value and the charging protection parameter does not continuously meet a preset protection condition, outputting a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack.
In some embodiments of the application, based on the above technical solution, after the executing the stop charging instruction to stop outputting the charging current to the battery pack, the method further includes:
and assigning the state of charge of the battery pack to be a full state, wherein the state of charge is used for reflecting the residual electric quantity of the battery pack.
In some embodiments of the present application, based on the above technical solution, after assigning the state of charge of the battery pack to a full state according to the stop charging instruction, the method further includes:
and when the external power supply is detected to be reconnected after being disconnected and the state of charge of the battery pack is lower than a preset electric quantity threshold value, outputting a charging instruction to the power conversion circuit so as to control the power conversion circuit to output charging current to the battery pack.
In some embodiments of the present application, based on the above technical solutions, the monitoring of the operating state of the battery pack includes:
acquiring a current sampling value acquired by a sampling device, wherein the sampling device is arranged on the power conversion circuit board and is used for sampling the current output to the battery pack by the power conversion circuit board;
comparing the current sampling value with a preset current threshold range;
if the current sampling value is within the preset current threshold range, determining that the battery pack is in a standby state;
and if the current sampling value is larger than the maximum value of the preset current threshold range, determining that the battery pack is in a charging state.
According to an aspect of an embodiment of the present application, there is disclosed a charge control device including:
a first acquisition module configured to acquire an access state of an external power supply;
the monitoring module is configured to monitor the working state of the battery pack when the access state indicates that the external power supply is accessed, wherein the working state comprises a charging state and a standby state;
the second acquisition module is configured to acquire a voltage parameter and a charging protection parameter of the battery pack when the working state is monitored to be converted from the charging state to the standby state;
the charging control module is configured to output a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting a charging current to the battery pack when the voltage parameter is greater than a preset voltage threshold and the charging protection parameter does not meet a preset protection condition.
According to an aspect of embodiments herein, there is provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the charging control method as in the above technical solution.
According to the charging control method, when the condition that the energy storage device is connected to the external power supply is monitored, the working state of the battery pack in the energy storage device is monitored. When the working state of the battery pack is monitored to be converted from the charging state to the standby state, the battery pack stops charging, namely the charging loop of the battery pack may be actually disconnected. At the moment, the voltage parameter and the charging protection parameter of the battery pack are obtained, and whether the charging is stopped because the battery pack triggers the preset protection condition in the charging process can be judged according to the charging protection parameter, namely whether the charging is stopped is triggered by software. When the voltage parameter of the battery pack is greater than the preset voltage threshold, namely the battery pack has higher voltage and electric quantity at the moment, and the charging protection parameter does not meet the preset protection condition, the reason that the battery pack stops charging can be determined not to trigger software protection caused by the preset protection condition, but to trigger protection on hardware because the battery pack is already in a charging overvoltage state, so that the charging and discharging loop is directly disconnected. At this time, a charging stop command is output to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack. So, also synchronous trigger protection from software stops the output heavy current, can avoid hardware protection to resume the back, and battery package charging circuit resumes to switch on the back, because software does not protect, and the power conversion board exports great charging current to the battery package immediately and charges, makes hardware trigger protection once more again, so relapse, the hiccup phenomenon appears, leads to the battery package to be charged repeatedly.
Therefore, the charging control method provided by the application monitors the state conversion of the battery pack in the charging process, judges whether the battery pack is disconnected due to overvoltage or not according to the voltage parameter and the charging protection parameter of the battery pack, and stops outputting the charging current to the battery pack if the battery pack is disconnected due to overvoltage, so that the situation that the battery pack is repeatedly charged in the overvoltage state is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 shows a schematic application environment of one embodiment of the present application.
Fig. 2 shows a flowchart of the steps of a charging control method in one embodiment of the present application.
Fig. 3 schematically shows a block diagram of a charging control device provided in an embodiment of the present application.
Fig. 4 schematically shows a block diagram of a power conversion apparatus provided in an embodiment of the present application.
FIG. 5 schematically illustrates a block diagram of a computer system suitable for use in implementing an electronic device of an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. they may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flowcharts shown in the figures are illustrative only and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The following describes in detail a charging control method, a charging control device, a power conversion device, a storage medium, and the like according to the present application with reference to specific embodiments.
Fig. 1 shows a schematic application environment of one embodiment of the present application. As shown in fig. 1, the battery pack 10 is externally discharged or charged by an external power supply 30 through a power conversion circuit 40, and a BMS board 20 for managing charging and discharging of the battery pack is generally provided on the battery pack 10.
As shown in fig. 1, the battery pack 10 includes a plurality of battery cells 11. For example, the battery cells 11 may be connected in series to form the battery pack 10. It is understood that the battery cells 11 may also be connected in parallel, or in other combinations, to form a battery pack, which is not limited in this application.
The BMS board 20 electrically connected to the battery pack is generally disposed adjacent to or packaged in the battery pack, and the BMS board 20 includes a charging switching tube 22 and/or a discharging switching tube 22, i.e., a charging/discharging switching tube 22, disposed on a discharging circuit of the battery pack. For example, as shown in fig. 1, the charge/discharge switch 22 may be a MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET, metal-Oxide-Semiconductor Field-Effect Transistor). In other embodiments, the battery pack may also be other devices having a switching function, such as an IGBT (Insulated Gate Bipolar Transistor) or a triode, etc. the BMS board 20 is further provided with an AFE chip 21 (analog front end) 21 for detecting a battery charging parameter, for example, for collecting a voltage, a current temperature, a temperature of the charge/discharge switching tube 22, and controlling the on/off of the charge/discharge switching tube 22, etc. it is understood that the analog front end chip 21 may accurately detect different charging parameters of the battery pack 10 on the BMS board 20, such as a voltage, a current, a temperature of the charge/discharge switching tube 22, etc.
The power conversion circuit 40 may be disposed on a circuit board to perform a voltage conversion function, such as ac-dc conversion or dc-dc conversion, to charge the battery pack 10 or discharge the electric energy of the battery pack 10 to the outside. The battery pack 10 is externally discharged and charged through the switching tube 220 and the power conversion circuit 40 on the BMS board 20. The external power source 30 charges the battery pack 10 through the power conversion circuit 40, and the circuit board on which the power conversion circuit 40 is located may be provided with an interface to access the external power source 30.
It is understood that the power conversion circuit 40, the BMS board 20, and the battery pack 10 may be integrated into the same device to form an energy storage device, or may be separate devices to form an energy storage system. Illustratively, the BMS board 20 and the battery pack 10 may form a separate battery device, the circuit board on which the power conversion circuit 40 is located may be a separate inverter device, different interfaces are provided on the inverter device for connecting the battery device, other external power sources and loads, the battery device is connected to the inverter device, the loads are powered through the inverter device, or the external power sources are charged, so that the external power sources, the inverter device and the battery device form an energy storage system.
It is understood that the power conversion circuit 40 further includes a controller (not shown in fig. 1) for executing the charging control method according to the embodiments of the present application.
It is understood that in other embodiments, the power conversion circuit 40 may be disposed on a different circuit board. For example, the related circuit of the ac/dc conversion part is disposed on the first circuit board to implement the ac/dc conversion function, and the related circuit of the dc/dc conversion part is disposed on the second circuit board to implement the dc conversion function, or other arrangements are adopted, which is not limited in this application.
It should be noted that, in the related battery technologies, the cell overvoltage information of the energy storage device of the battery pack 10 during the charging process often cannot be detected by software, such as a controller, and a hardware circuit directly disposed on the battery pack 10 in a synchronous manner in time, so that the battery pack of the energy storage device is still repeatedly and continuously charged in an overvoltage state. For example, the hardware over-voltage point of a single cell is 3.65V, and the software over-voltage point is 3.63V. Because the AFE chip on the BMS circuit board can directly detect the voltage of a single cell, when the BMS circuit board detects that the voltage of any cell exceeds 3.65V, hardware overvoltage protection is triggered and charging is stopped. For software protection, the control chip can only detect the voltage at the P + of the energy storage device of the power conversion circuit 40 as the total voltage of the energy storage device of the battery pack 10, and then determine whether the energy storage device of the battery pack 10 is overvoltage or not according to the average voltage obtained by the total voltage and the number of battery cores of the energy storage device. The cell voltage of the energy storage device of the battery pack 10 is often unbalanced when charging, so that the voltage of a certain cell may exceed 3.65V, and the average voltage detected by the control chip does not reach 3.63V, so that the control chip does not trigger a charging completion instruction, which causes the power conversion circuit 40 to continue to repeatedly charge the energy storage device of the battery pack 10 with a large current after the hardware overvoltage protection is removed, thereby causing damage to the energy storage device of the battery pack 10.
In order to solve the above problem, fig. 2 shows a flowchart of steps of a charging control method in an embodiment of the present application, and as shown in fig. 2, the charging control method is applied to a controller, the controller is disposed on a power conversion circuit, the power conversion circuit is connected to two ends of a battery pack, and the battery pack is discharged or charged through the power conversion circuit, and the charging control method mainly includes the following steps S100 to S400. The following describes each method step in the charge control method in detail.
And step S100, acquiring the access state of the external power supply.
Specifically, the purpose of the technical scheme of the application is to avoid the situation that the battery pack has reached an overvoltage state and is still repeatedly input with high-power current in the charging process, so that the access state of the external power supply needs to be acquired, that is, when the energy storage device is connected with the external power supply, the battery pack may be charged by overvoltage.
It is understood that the energy storage device may include the power conversion circuit 40, the BMS board 20, and the battery pack 10 shown in fig. 1. In other embodiments, the present scheme may be executed by a device independent of the power conversion circuit 40, which is not limited in this application.
The access state of the external power source may be determined by detecting the access of the external power source. For example, as mentioned above, the circuit board on which the power conversion circuit is located may be provided with a first interface for accessing an external power supply, and it may be determined whether the external power supply is accessed by detecting a change in voltage at the first interface.
And step S200, monitoring the working state of the battery pack when the access state indicates that an external power supply is accessed.
And when the power conversion circuit is monitored to be connected with an external power supply, monitoring the working state of the battery pack. The working state comprises a charging state, a standby state and a discharging state. The charging state is a state in which the battery pack acquires electric energy from an external power source through the power conversion circuit, the discharging state is a state in which the battery pack releases electric energy to an external device through the power conversion circuit, and the standby state is a state in which the battery pack neither externally acquires electric energy nor externally releases electric energy. The monitoring of the operating state of the battery pack can be realized by monitoring the current or voltage at the connection of the power conversion circuit and the battery pack, for example, by monitoring the voltage or current at P + in fig. 1.
Step S300, when it is monitored that the working state is switched from the charging state to the standby state, obtaining a voltage parameter and a charging protection parameter of the battery pack.
And when the working state of the battery pack is monitored to be converted from the charging state to the standby state, the battery pack stops charging. At this time, a voltage parameter and a charge protection parameter of the battery pack are obtained, wherein the voltage parameter can measure a current charge state of the battery pack, for example, whether the battery pack is fully charged. For the battery pack, a voltage threshold may be set, and when the voltage of the battery pack reaches the voltage threshold, it is indicated that the battery pack is nearly fully charged, and when the voltage of the battery pack exceeds the voltage threshold, it is determined that the battery pack is in an overvoltage state. It can be understood that, for software overvoltage protection, since the cell voltage of each cell in the battery pack cannot be directly obtained, the voltage parameter may be an average voltage of the cells in the battery pack. The charging protection parameter is used for judging whether a preset protection condition is triggered because the battery pack is in an abnormal state in the charging process, so that the battery pack stops charging. The charging protection parameters include, but are not limited to, an overcurrent protection value, an overvoltage protection value, an over-temperature protection value and the like of the battery pack during charging.
In step S400, when the voltage parameter is greater than the preset voltage threshold and the charging protection parameter does not satisfy the preset protection condition, a charging stop instruction is output to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack.
Specifically, when the voltage parameter of the battery pack is greater than the preset voltage threshold, that is, a certain electric core in the battery pack may already be in an overvoltage state at this time. Here, the preset voltage threshold is smaller than the voltage protection threshold in the preset protection condition, that is, smaller than the overvoltage protection value of the controller triggering the battery pack overvoltage protection.
On the premise, if the charging protection parameter does not meet the preset protection condition, it can be determined that the reason for stopping the charging behavior of the battery pack is not to trigger the preset protection condition, but to trigger the hardware protection due to the overvoltage, which indicates that the battery pack is already in the charging overvoltage state at this time.
At this moment, output stops charging instruction to power conversion circuit to control power conversion circuit and stop output charging current to battery package, can avoid hardware protection to resume the back, battery package charge circuit resume the back of switching on, because the software does not protect, power conversion circuit exports great charging current to battery package immediately and charges, makes hardware trigger protection again, so relapse, the hiccup phenomenon appears, leads to the battery package to be charged repeatedly.
According to the charging control method, when the condition that the energy storage device is connected to the external power supply is monitored, the working state of the battery pack in the energy storage device is monitored. When the working state of the battery pack is monitored to be converted from the charging state to the standby state, the charging behavior of the battery pack is stopped, namely the charging loop of the battery pack may be actually disconnected. At this time, the voltage parameter and the charging protection parameter of the battery pack are obtained, and whether the charging is stopped due to the fact that the preset protection condition is triggered in the charging process of the battery pack can be judged according to the charging protection parameter, namely whether the charging is stopped is triggered by software. When the voltage parameter of the battery pack is greater than the preset voltage threshold, namely the battery pack has higher voltage and electric quantity at the moment, and the charging protection parameter does not meet the preset protection condition, it can be determined that the reason why the battery pack stops charging is not software protection caused by triggering the preset protection condition, but protection is triggered on hardware because the battery pack is already in a charging overvoltage state, so that the charging and discharging loop is directly disconnected. At this time, a charging stop command is output to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack. So, also synchronous trigger protection from software stops to export heavy current, can avoid hardware protection to resume the back, and the battery package charging circuit resumes to switch on the back, because software does not protect, and the power conversion board exports great charging current to the battery package immediately and charges, makes hardware trigger protection again, so relapse, the hiccup phenomenon appears, leads to the battery package to be charged repeatedly.
Therefore, the charging control method provided by the application monitors the state conversion of the battery pack in the charging process, judges whether the battery pack is disconnected due to overvoltage or not according to the voltage parameter and the charging protection parameter of the battery pack, and stops outputting the charging current to the battery pack if the battery pack is disconnected due to overvoltage, so that the situation that the battery pack is repeatedly charged in the overvoltage state is avoided.
Further, on the basis of the above embodiment, the voltage parameter is a cell average voltage, the battery pack includes a plurality of cells, and the step S300 of acquiring the voltage parameter of the battery pack includes the following steps S301 and S302.
In step S301, the current total voltage of the battery pack is detected.
Step S302, calculating the average voltage of the battery cells according to the current total voltage of the battery pack and the number of the battery cells.
Specifically, the protection measures for preventing the battery pack of the energy storage device from being charged by overvoltage include software protection and hardware protection, and the overvoltage protection is triggered when the voltage of a single cell of the battery pack is greater than an overvoltage protection value. As shown in fig. 2, since the power conversion circuit performing software protection can only detect the total voltage of the battery pack at the P +, the voltage parameter used by the controller to determine whether the battery pack is overvoltage can only be an average parameter calculated according to the total voltage, rather than a directly measured single cell voltage. In the hardware protection, the sensor directly detects the voltage of a single battery cell, and as long as the single battery cell is overvoltage, the battery pack is judged to have reached an overvoltage state. It can be understood that since a hardware device performing hardware protection, such as the BMS board shown in fig. 1, is directly connected to the battery pack, the AFE chip thereof may be directly provided at each cell of the battery pack, and thus the voltage of an individual cell in the battery pack may be accurately detected.
Further, on the basis of the above embodiment, the charging protection parameters include the battery charging parameter and the charging failure parameter, and the obtaining of the charging protection parameters of the battery pack in the above step S300 includes the following steps S303 to S305.
In step S303, the charging temperature and the charging current of the battery pack during the charging process are detected to determine the charging parameters of the battery.
Specifically, during the charging of the battery pack, whether the battery pack is in a normal charging state during the charging is determined by detecting the temperature at P + and the magnitude of the output charging current on the power conversion circuit provided with the controller.
It can be understood that the magnitude of the charging current at B + at the BMS board is substantially the same as the magnitude of the charging current and the temperature at the power conversion circuit P +.
Step S304, detecting the working state of the power conversion circuit board to determine the charging fault parameters.
Specifically, by detecting the operating state of the power conversion circuit, such as detecting whether an excessive current/an excessive temperature exists in the conversion circuit, such as an inverter, in the power conversion circuit during the charging process, or a fan is blocked, or a bus is over-voltage, and the like, it can be determined whether the battery pack stops being charged due to the failure of the power conversion circuit.
In step S305, when the charging fault parameter matches the preset fault code, or the battery charging parameter is greater than or equal to the preset charging protection threshold, it is determined that the charging protection parameter meets the preset protection condition.
Specifically, when the controller detects that the detected power conversion circuit has an excessive current/an excessive temperature in the charging process, or a fan is blocked, or a bus is in overvoltage and the like, a preset fault code corresponding to the fault condition is generated, and the reason that the battery pack stops charging can be determined to be that a preset protection condition is met according to the preset fault code, namely, hardware protection is triggered due to the fault of the inverter. Or, when detecting that the temperature of the battery pack is too high/the charging current is too large in the charging process, the preset protection condition is also met, namely, the charging protection is triggered due to the abnormal charging state of the power conversion circuit or the battery pack.
Therefore, in the embodiment, the situation that the battery pack stops charging is traversed according to the charging temperature, the charging current and the working state of the inverter of the battery pack in the charging process, that is, if the situation meets the preset protection condition, the protection is triggered to stop charging the battery pack, and only when the preset protection condition is not met, the hardware protection may be triggered due to the overvoltage state, and the charging loop is cut off to stop charging.
Further, on the basis of the above embodiment, when the voltage parameter is greater than the preset voltage threshold and the charge protection parameter does not satisfy the preset protection condition in step S400, the step S401 and step S402 are included for outputting the stop-charging instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack.
Step S401, obtaining the overvoltage detection time length.
Step S402, in the overvoltage detection time period, if the voltage parameter is continuously greater than the preset threshold value and the charging protection parameter continuously does not meet the preset protection condition, outputting a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack.
Specifically, when the average voltage of the battery core of the battery pack continuously reaches the preset threshold value within a certain time period, and the condition that the preset protection condition is met does not exist, it may be determined that the battery pack reaches an overvoltage state to trigger hardware protection, so that the battery pack stops charging. It is to be understood that the time period may be 2 seconds, 5 seconds, 8 seconds, or the like, and is not limited in particular.
The embodiment avoids the situation that the battery pack is mistakenly judged as overvoltage to stop charging due to the voltage fluctuation of the battery pack in the charging process when the overvoltage detection time is too short, and also avoids the situation that the battery pack still repeatedly receives overlarge charging current in an overvoltage state due to the fact that the power conversion circuit cannot be timely controlled to stop outputting the charging current when the overvoltage detection time is too long.
Further, on the basis of the above embodiment, after the stop charging instruction is executed in the above step S400 to stop outputting the charging current to the battery pack, the method further includes the following step S403.
Step S403, assigning the state of charge of the battery pack to a full state, where the state of charge is used to reflect the remaining power of the battery pack.
In particular, since the voltage parameter of the battery pack is directly detected by the sensor and the response speed of the hardware protection triggered when the battery pack is over-pressurized may be faster than the response speed of the software protection performed by the controller. Therefore, when the controller determines that the battery pack stops charging due to overvoltage triggering hardware protection, the battery pack is full, at the moment, the state of charge of the battery pack is assigned to the full state from the non-full state, more accurate state of charge can be displayed, and user experience is improved.
Further, based on the above embodiment, after the above step S403, the method further includes the following step S404 after assigning the state of charge of the battery pack to the full state of charge according to the stop charging instruction.
Step S404, when it is detected that the external power source is disconnected and then reconnected and the state of charge of the battery pack is lower than the preset electric quantity threshold, outputting a charging instruction to the power conversion circuit to control the power conversion circuit to output a charging current to the battery pack.
Specifically, when the connection state of the energy storage device and the external power supply is monitored, the energy storage device and the external power supply are disconnected, the energy storage device and the external power supply are reconnected after a period of time, and meanwhile, the charge state of the battery pack is lower than a preset electric quantity threshold value, the energy storage device is considered to pass through a certain electric energy consumption process, and the battery pack in the energy storage device is no longer in a full-charge state, so that the energy storage device can be recharged, a charging instruction is output to the power conversion circuit, and the power conversion circuit is controlled to output charging current to the battery pack for charging. The preset electric quantity threshold may be 98%, 95%, 90%, or the like of the full electric state, and is not limited in this respect.
Therefore, the specific limiting condition for recovering the charging behavior after the battery pack stops the charging behavior due to overvoltage triggering hardware protection is provided by the embodiment, and the condition that the battery pack is damaged due to the fact that high-power charging current is input immediately after discharging due to some reasons of the battery pack under the continuous connection state of the energy storage device and the external power supply is avoided.
Further, on the basis of the above embodiment, the monitoring of the operating state of the battery pack in the step S100 includes the following steps S101 to S104.
And step S101, acquiring a current sampling value acquired by a sampling device.
Step S102, comparing the current sampling value with a preset current threshold range.
Step S103, if the current sampling value is within the preset current threshold range, determining that the battery pack is in a standby state.
And step S104, if the current sampling value is larger than the maximum value of the preset current threshold range, determining that the battery pack is in a charging state.
Specifically, the sampling device is arranged on the power conversion circuit board and used for sampling the current output by the power conversion circuit board to the battery pack. The current input into the battery pack through the charge-discharge switch is sampled through a sampler arranged on the power conversion circuit board, and if the current sampling value is within a preset current threshold range, the battery pack is determined to be in a standby state, namely, the battery pack does not have a charging behavior at the moment. For example, the preset current threshold may range from-1A to 1A, and may be determined according to the characteristics of the battery cell and the characteristics of the sampling device of the battery pack, and is not specifically limited herein. If the current sampling value is larger than 1A, the battery pack is determined to be in a charging state, and electric energy is obtained through the charging and discharging switching tube. The preset current threshold range is used for avoiding that the battery pack is misjudged to be in a charging state due to current sampling errors, namely, a sampling device can detect a certain current value due to the sampling errors even if the battery pack is in a standby state under normal conditions.
In addition, in other possible embodiments, the sampling current may be obtained by collecting a voltage drop across a sampling resistor connected to the battery pack and disposed on the power conversion circuit by a voltage sensor, and then calculating a current flowing through the sampling resistor according to the voltage drop.
Embodiments of the apparatus of the present application are described below, which may be used to perform the charge control methods of the above-described embodiments of the present application. Fig. 3 schematically shows a block diagram of a charging control device provided in an embodiment of the present application. The device is arranged in the controller. As shown in fig. 3, the charge control device 300 includes:
a first obtaining module 310 configured to obtain an access status of the external power source.
And a monitoring module 320 configured to monitor an operating state of the battery pack when the access state indicates that an external power source is accessed, where the operating state includes a charging state and a standby state.
The second obtaining module 330 is configured to obtain the voltage parameter and the charge protection parameter of the battery pack when it is detected that the operating state is switched from the charging state to the standby state.
And the charging control module 340 is configured to output a charging stop instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack when the voltage parameter is greater than the preset voltage threshold and the charging protection parameter does not meet the preset protection condition.
In an embodiment of the present application, based on the above embodiment, the second obtaining module includes:
a voltage acquisition unit configured to detect a current total voltage of the battery pack; and calculating the average voltage of the battery cells according to the current total voltage of the battery pack and the number of the battery cells.
In an embodiment of the present application, based on the above embodiment, the second obtaining module further includes:
the charging protection parameter acquisition module is configured to detect the charging temperature and the charging current of the battery pack in the charging process so as to determine the charging parameters of the battery; detecting the working state of the power conversion circuit board to determine charging fault parameters; when the charging fault parameter is matched with the preset fault code or the battery charging parameter is greater than or equal to the preset charging protection threshold value, the charging protection parameter is confirmed to meet the preset protection condition.
In an embodiment of the present application, based on the above embodiment, the charging control module 340 includes:
a detection duration acquisition unit configured to acquire an overvoltage detection duration;
and the charging control unit is configured to output a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack if the voltage parameter is continuously greater than the preset threshold value and the charging protection parameter does not continuously meet the preset protection condition within the overvoltage detection time length.
In an embodiment of the present application, based on the above embodiment, the charging control module 340 further includes:
the assigning unit is configured to assign the state of charge of the battery pack to a full state of charge, and the state of charge is used for reflecting the residual capacity of the battery pack.
In an embodiment of the present application, based on the above embodiment, the charging control module 340 further includes:
the instruction output unit is configured to output a charging instruction to the power conversion circuit when the external power supply is detected to be reconnected after being disconnected and the state of charge of the battery pack is lower than a preset electric quantity threshold value, so as to control the power conversion circuit to output a charging current to the battery pack.
In an embodiment of the present application, based on the above embodiments, the monitoring module 320 includes:
the current sampling unit is configured to acquire a current sampling value acquired by the sampling device, and the sampling device is arranged on the power conversion circuit board and is used for sampling current output to the battery pack by the power conversion circuit board;
the current comparison unit is configured to compare the current sampling value with a preset current threshold range; if the current sampling value is within the preset current threshold range, determining that the battery pack is in a standby state; and if the current sampling value is larger than the maximum value of the preset current threshold range, determining that the battery pack is in a charging state.
The present application further provides a power conversion apparatus, which can be used to execute the charging control method in the foregoing embodiments of the present application. The power conversion device comprises a power conversion circuit and a first interface, wherein the first interface is used for accessing the battery pack. The power conversion device further includes a memory, a processor, and a charging control program of the battery pack stored in the memory and operable on the processor, wherein the charging control program, when executed by the processor, implements the charging control method according to the above embodiment.
As shown in fig. 4, the power conversion apparatus 400 includes a power conversion circuit 410, a memory 420, a processor 430, and a first interface 440, wherein the first interface 440 is used for connecting a battery pack. In addition, the power converter 400 may further include a second interface (not shown in fig. 4) for accessing an external power source to charge the battery pack.
It is understood that, in the present embodiment, the battery pack may be a battery pack 10 in which the BMS board shown in fig. 1 is integrated, that is, includes a plurality of battery cells 11 and a BMS board 20.
It is understood that the power conversion circuit 410 may be the power conversion circuit shown in fig. 1, and the processor 430 and the memory 420 may be disposed on a circuit board on which the power conversion circuit is disposed, or may be disposed on other circuit boards in the energy storage device.
It is understood that more or fewer modules may be included in the power conversion apparatus 400, for example, a battery pack may be included in the power conversion apparatus 400, which is not limited in this application.
The application also provides an electronic device, which can be an energy storage device comprising the power conversion device.
Fig. 5 schematically shows a block diagram of a computer system of an electronic device for implementing an embodiment of the present application.
It should be noted that the computer system 500 of the electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
It should be noted that the computer system 500 of the electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 5, the computer system 500 includes a Central Processing Unit (CPU) 501 that can perform various appropriate actions and processes according to a program stored in a Read-Only Memory (ROM) 502 or a program loaded from a storage section 508 into a Random Access Memory (RAM) 503. In the random access memory 503, various programs and data necessary for system operation are also stored. The cpu 501, the rom 502 and the ram 503 are connected to each other via a bus 504. An Input/Output interface 505 (Input/Output interface, i.e., I/O interface) is also connected to the bus 504.
The following components are connected to the input/output interface 505: an input portion 506 including a keyboard, a mouse, and the like; an output section 507 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like; a storage portion 508 including a hard disk and the like; and a communication section 509 including a network interface card such as a local area network card, modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The driver 510 is also connected to the input/output interface 505 as necessary. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as necessary, so that a computer program read out therefrom is mounted into the storage section 508 as necessary.
In particular, according to embodiments of the present application, the processes described in the various method flowcharts may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed over a network, and/or installed from a removable medium. When executed by the processor, the computer program executes various functions defined in the charging control device or the power conversion device of the present application.
It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A charging control method is applied to a controller, and is characterized in that the controller is arranged on a power conversion circuit, the power conversion circuit is connected with two ends of a battery pack, the battery pack discharges or receives charging through the power conversion circuit, and the charging control method comprises the following steps:
acquiring the access state of an external power supply;
when the access state indicates that the external power supply is accessed, monitoring the working state of the battery pack, wherein the working state comprises a charging state and a standby state;
when the working state is monitored to be converted from the charging state to the standby state, acquiring voltage parameters and charging protection parameters of the battery pack;
and when the voltage parameter is greater than a preset voltage threshold value and the charging protection parameter does not meet a preset protection condition, outputting a charging stopping instruction to the power conversion circuit so as to control the power conversion circuit to stop outputting a charging current to the battery pack.
2. The charge control method according to claim 1, wherein the voltage parameter is a cell average voltage, the battery pack includes a plurality of cells, and the obtaining the voltage parameter of the battery pack includes:
detecting a current total voltage of the battery pack;
and calculating the average voltage of the battery cells according to the current total voltage of the battery pack and the number of the battery cells.
3. The charging control method according to claim 2, wherein the charging protection parameters include a battery charging parameter and a charging failure parameter, and obtaining the charging protection parameters of the battery pack includes:
detecting a charging temperature and a charging current of the battery pack in a charging process to determine the battery charging parameters;
detecting an operating state of the power conversion circuit to determine the charge fault parameter;
and when the charging fault parameter is matched with a preset fault code or the battery charging parameter is greater than or equal to a preset charging protection threshold value, confirming that the charging protection parameter meets a preset protection condition.
4. The charge control method of claim 1, wherein outputting a stop-charging command to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack when the voltage parameter is greater than a preset voltage threshold and the charge protection parameter does not satisfy a preset protection condition comprises:
acquiring overvoltage detection duration;
within the overvoltage detection time, if the voltage parameter is continuously greater than a preset threshold value and the charging protection parameter does not continuously meet a preset protection condition, outputting a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting the charging current to the battery pack.
5. The charge control method according to claim 1, wherein after said executing a stop-charging instruction to stop outputting a charging current to the battery pack, the method further comprises:
and assigning the state of charge of the battery pack to be a full state, wherein the state of charge is used for reflecting the residual electric quantity of the battery pack.
6. The charge control method according to claim 5, wherein after assigning the state of charge of the battery pack to a full state of charge according to the stop charge instruction, the method further comprises:
and when the external power supply is detected to be reconnected after being disconnected and the state of charge of the battery pack is lower than a preset electric quantity threshold value, outputting a charging instruction to the power conversion circuit so as to control the power conversion circuit to output charging current to the battery pack.
7. The charge control method of claim 1, wherein said monitoring the operating state of said battery pack comprises:
acquiring a current sampling value acquired by a sampling device, wherein the sampling device is arranged on the power conversion circuit board and is used for sampling the current output to the battery pack by the power conversion circuit board;
comparing the current sampling value with a preset current threshold range;
if the current sampling value is within the preset current threshold range, determining that the battery pack is in a standby state;
and if the current sampling value is larger than the maximum value of the preset current threshold range, determining that the battery pack is in a charging state.
8. A charge control device, characterized by comprising:
a first acquisition module configured to acquire an access state of an external power supply;
the monitoring module is configured to monitor the working state of the battery pack when the access state indicates that the external power supply is accessed, wherein the working state comprises a charging state and a standby state;
the second acquisition module is configured to acquire a voltage parameter and a charging protection parameter of the battery pack when the working state is monitored to be converted from the charging state to the standby state;
the charging control module is configured to output a charging stopping instruction to the power conversion circuit to control the power conversion circuit to stop outputting a charging current to the battery pack when the voltage parameter is greater than a preset voltage threshold and the charging protection parameter does not meet a preset protection condition.
9. A power conversion device, comprising a power conversion circuit, a first interface, and a battery pack access control program, wherein the power conversion device further comprises a memory, a processor, and a battery pack charge control program stored in the memory and executable on the processor, and wherein the battery pack charge control program, when executed by the processor, implements the charge control method according to any one of claims 1 to 7.
10. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, implements the charging control method according to any one of claims 1 to 7.
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| CN202211166796.9A CN115663939A (en) | 2022-09-23 | 2022-09-23 | Charging control method, charging control device, power conversion device, and medium |
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| CN202211166796.9A CN115663939A (en) | 2022-09-23 | 2022-09-23 | Charging control method, charging control device, power conversion device, and medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117811141A (en) * | 2023-12-28 | 2024-04-02 | 苏州星德胜智能电气有限公司 | Method, system, device and storage medium for controlling charge and discharge of dust collector battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117811141A (en) * | 2023-12-28 | 2024-04-02 | 苏州星德胜智能电气有限公司 | Method, system, device and storage medium for controlling charge and discharge of dust collector battery |
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