Charging methods, battery management systems for power batteries, and charging stations

Abstract

A charging method, a battery management system for a power battery, and a charging pile are disclosed to effectively ensure the normal charging of electric vehicles. The charging method is used to charge a power battery, and the method includes: the battery management system (BMS) (10) of the power battery determines pulse charging demand parameters based on the battery state parameters of the power battery; the BMS (10) sends pulse charging information to the charging pile (20), the pulse charging information including the pulse charging demand parameters, the pulse charging demand parameters being used to instruct the charging pile (20) to output a pulse current, and the pulse current being used to charge the power battery.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more specifically, to a charging method, a power battery management system, and a charging pile. Background Technology

[0002] With the increasing energy shortage and environmental pollution in modern society, electric vehicles, as a new energy vehicle, have received widespread attention since their introduction. However, the charging problem has always been a major factor restricting their development.

[0003] Therefore, ensuring the effective charging of electric vehicles is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a charging method, a battery management system for a power battery, and a charging pile, which can effectively ensure the normal charging of electric vehicles.

[0005] In a first aspect, a charging method is provided for charging a power battery, the method comprising: determining pulse charging demand parameters based on battery state parameters of the power battery; sending pulse charging information to a charging pile, the pulse charging information including the pulse charging demand parameters, the pulse charging demand parameters being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery.

[0006] The above technical solution involves the Battery Management System (BMS) determining pulse charging demand parameters based on the battery state parameters of the power battery. The charging pile can then output pulse current to the power battery according to these parameters. This avoids the problem of the charging pile's output voltage and current range not matching the power battery in some scenarios, thus ensuring normal charging of the power battery. Furthermore, battery state parameters are the most representative indicators of the power battery's condition, and the pulse current converted from these parameters effectively ensures normal power supply to the battery.

[0007] In some possible embodiments, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0008] In some possible embodiments, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0009] In some possible embodiments, the method further includes: determining, based on the battery state parameters, to enter a pulse charging mode, wherein the pulse charging mode is a charging mode using pulsed voltage or pulsed current.

[0010] Since battery state parameters are the most representative parameters of the power battery's state, the above technical solution can improve the accuracy of entering the pulse charging mode by determining the pulse charging mode based on the battery state parameters.

[0011] In some possible embodiments, the battery state parameters include the battery temperature of the power battery, and determining to enter the pulse charging mode based on the battery state parameters includes: if the battery temperature is less than or equal to a temperature threshold, determining to enter the pulse charging mode.

[0012] In low-temperature environments, the power conversion device enters pulse charging mode to convert the DC current output by the charging pile into pulse current, avoiding the problem of lithium batteries being unable to charge in low-temperature environments. Compared with traditional methods, the above technical solution does not require the installation of a device inside the battery pack for preheating of the power battery, thereby significantly shortening the charging time, allowing the battery temperature to rise rapidly, and effectively improving the charging efficiency of the power battery. Furthermore, since no heating device is needed inside the battery pack, the above technical solution can also reduce the weight and cost of the power battery.

[0013] In some possible embodiments, the method further includes: if the battery temperature is greater than the temperature threshold, sending an exit indication message to the charging pile, the exit indication message being used to indicate that the charging pile exits the pulse charging mode.

[0014] Secondly, a charging method is provided for charging a power battery. The method includes: a charging pile receiving pulse charging information sent by the battery management system (BMS) of the power battery, the pulse charging information including pulse charging demand parameters, the pulse charging demand parameters being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery; and the charging pile outputting the pulse current to the power battery according to the pulse charging demand parameters.

[0015] In some possible embodiments, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0016] In some possible embodiments, the pulse charging demand parameters are determined based on the battery state parameters of the power battery.

[0017] In some possible embodiments, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0018] In some possible embodiments, the method further includes: the charging pile receiving exit indication information sent by the BMS when the battery temperature of the power battery is greater than a temperature threshold, the exit indication information being used to indicate that the charging pile exits the pulse charging mode, the pulse charging mode being a charging mode using pulsed voltage or pulsed current.

[0019] Thirdly, a battery management system for a power battery is provided, comprising: a first processing unit, configured to determine pulse charging demand parameters based on the battery state parameters of the power battery; and a first communication unit, configured to send pulse charging information to a charging pile, wherein the pulse charging information includes pulse charging demand parameters, the pulse charging demand parameters being used to instruct the charging pile to output a pulse current, and the pulse current being used to charge the power battery.

[0020] In some possible embodiments, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0021] In some possible embodiments, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0022] In some possible embodiments, the first processing unit is further configured to: determine, based on the battery state parameters, to enter a pulse charging mode, wherein the pulse charging mode is a charging mode employing pulsed voltage or pulsed current.

[0023] In some possible embodiments, the battery state parameters include the battery temperature of the power battery, and the first processing unit is specifically used to: determine to enter the pulse charging mode if the battery temperature is less than or equal to a temperature threshold.

[0024] In some possible embodiments, the first communication unit is further configured to: if the battery temperature is greater than the temperature threshold, send an exit indication message to the charging pile, the exit indication message being used to indicate that the charging pile exits the pulse charging mode.

[0025] Fourthly, a charging pile is provided for charging a power battery, comprising: a second communication unit for receiving pulse charging information sent by the battery management system (BMS) of the power battery, the pulse charging information including pulse charging demand parameters, the pulse charging demand parameters being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery; and a second processing unit for outputting the pulse current to the power battery according to the pulse charging demand parameters.

[0026] In some possible embodiments, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0027] In some possible embodiments, the pulse charging demand parameters are determined based on the battery state parameters of the power battery.

[0028] In some possible embodiments, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0029] In some possible embodiments, the second communication unit is further configured to: receive exit indication information sent by the BMS when the battery temperature of the power battery is greater than a temperature threshold, the exit indication information being used to instruct the charging pile to exit the pulse charging mode, the pulse charging mode being a charging mode using pulsed voltage or pulsed current.

[0030] Fifthly, a battery management system for a power battery is provided, including a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to execute the methods described in the first aspect or its various implementations.

[0031] Sixthly, a charging station is provided, including a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to perform the methods in the second aspect or its various implementations described above.

[0032] In a seventh aspect, a computer-readable storage medium is provided for storing a computer program for performing the methods described in the first aspect or its various implementations.

[0033] Eighthly, a computer-readable storage medium is provided for storing a computer program for performing the methods of the second aspect above or any implementation thereof. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0035] Figure 1This is a schematic diagram of the application architecture to which the charging method of this application embodiment can be applied.

[0036] Figure 2 This is a schematic flowchart of a charging method according to an embodiment of this application.

[0037] Figure 3 yes Figure 2 The diagram shows a specific schematic flowchart of the charging method.

[0038] Figure 4 This is a schematic block diagram of the battery management system of the power battery according to an embodiment of this application.

[0039] Figure 5 This is a schematic block diagram of a charging pile according to an embodiment of this application.

[0040] Figure 6 This is another schematic block diagram of the battery management system of the power battery according to an embodiment of this application.

[0041] Figure 7 This is another schematic block diagram of a charging pile according to an embodiment of this application. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" means two or more and includes two; similarly, "multiple groups" means two or more and includes two groups, and "multiple pieces" means two or more and includes two pieces.

[0048] The charging issue has always been a major factor limiting the development of electric vehicles. In some special scenarios, the voltage and current output range of charging stations cannot match that of the power batteries. For example, in low-temperature environments, the minimum voltage or current output of a charging station may cause lithium plating during charging, preventing the power battery from charging properly. In addition, in some cases, power conversion may be required between the charging station and the power battery, such as changes in voltage, current, state of power, and timing of current, voltage, and power.

[0049] Therefore, this application provides a charging method that can effectively ensure the normal charging of the power battery.

[0050] Figure 1A schematic diagram of an application architecture to which the method for charging in the embodiments of the present application can be applied. The solid lines represent power lines and the dashed lines represent communication lines. The application architecture includes a Battery Management System (BMS) 10 and a charging pile 20. The BMS 10 can be connected to the charging pile 20 through a communication line to interact with the charging pile 20 for information. For example, the communication line can be a Controller Area Network (CAN) communication line or a daisy chain communication line.

[0051] The BMS 10 is the BMS of the power battery, and the power battery is a battery that provides a power source for the power-consuming device. Optionally, the power battery can be a power storage battery. In terms of the type of battery, the power battery can be a lithium-ion battery, a lithium-metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., which is not specifically limited in the embodiments of the present application. In terms of the scale of the battery, the power battery in the embodiments of the present application can be a cell / battery monomer, or a battery module or a battery pack, which is not specifically limited in the embodiments of the present application. Optionally, the power-consuming device can be a vehicle, a ship, a spacecraft, etc., which is not limited in the embodiments of the present application. The BMS is a control system for protecting the safe use of the power battery, implementing functions such as charge and discharge management, high-voltage control, battery protection, battery data collection, and battery state evaluation. Among them, the BMS can be integrated with the power battery in the same device / equipment, or the BMS can also be set as an independent device / equipment outside the power battery.

[0052] The charging pile 20, also known as a charger, is a device for charging the power battery. The charging pile can output a charging power according to the charging requirements of the BMS 10 to charge the power battery. For example, the charging pile 20 can output voltage and current according to the required voltage and required current sent by the BMS 10.

[0053] Figure 2 A schematic flowchart of the charging method 200 according to an embodiment of the present application is shown. It should be understood that Figure 2 The steps or operations in are only examples. The embodiments of the present application can also perform other operations or Figure 2 variations of the various operations in. In addition, Figure 2 The respective steps in can be executed in a different order from that presented in Figure 2 , and it is possible that not all the operations in Figure 2 are to be executed.

[0054] The BMS in the method 200 can be, for example, the BMS 10 in Figure 1 , and the charging pile can be, for example, Figure 1The charging pile 20 in the example. The following description of method 200 will use an electric vehicle as an example of the electrical device, but it should be understood that the implementation of this application is not limited thereto. Method 200 may include some or all of the following steps.

[0055] In step 210, the BMS determines the pulse charging requirement parameters based on the battery state parameters of the power battery.

[0056] Battery state parameters may include, but are not limited to, at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC). Pulse charging demand parameters may include at least one of the following parameters: pulse current demand, pulse voltage demand, pulse direction demand, pulse frequency demand, pulse interval demand, and pulse duration demand. For example, pulse charging demand parameters may include pulse voltage peak demand value, pulse current effective value demand value, pulse current peak demand value, pulse direction demand, and pulse frequency demand value.

[0057] In one implementation, the BMS can determine the pulse charging demand parameters based on the battery state parameters of the power battery and the correspondence between the battery state parameters and the pulse charging demand parameters.

[0058] Optionally, the correspondence between battery state parameters and pulse charging requirement parameters can be pre-configured on the BMS. For example, the correspondence between battery state parameters and pulse charging requirement parameters can be pre-configured on the BMS in the form of a table. In this way, the BMS can determine the pulse charging requirement parameters by internally looking up the table. For example, the correspondence between battery state parameters and pulse charging requirement parameters can be shown in Table 1. In Table 1, the first row is SOC, the first column is battery temperature, and A, B, and C are the pulse current requirement values. The BMS can determine the pulse current requirement value based on SOC, battery temperature, and Table 1. For example, if the battery temperature is -10℃ and the SOC is 30%, then the BMS can determine the pulse current requirement value as B.

[0059] Table 1

[0060]

[0061] It should be understood that Table 1 is for illustrative purposes only, and the SOC is not necessarily 0-100%, nor are the gradient values ​​of battery temperature and SOC necessarily as shown in Table 1. It should also be understood that the relationship between battery state parameters and pulse charging demand parameters can be linear or non-linear.

[0062] Optionally, the correspondence between battery state parameters and pulse charging demand parameters can also be obtained by the BMS from other devices.

[0063] In another implementation, the BMS can first determine the DC charging demand parameters based on the battery state parameters, and then determine the pulse charging demand parameters based on the DC charging demand parameters.

[0064] Specifically, DC charging demand parameters can include at least one of the following: voltage demand value, current demand value, and charging pile output mode. The charging pile output mode is either constant current mode or constant voltage mode. In constant voltage mode, the output voltage of the charging pile should meet the voltage demand value, and the output current should not exceed the current demand value. In constant current mode, the output current of the charging pile should meet the current demand value, and the output voltage should not exceed the voltage demand value. The BMS can perform internal calculations based on the DC charging demand parameters to obtain the pulse charging demand parameters; alternatively, the BMS can determine the pulse charging demand parameters based on the determined DC charging demand parameters and the correspondence between the DC charging demand parameters and the pulse charging demand parameters.

[0065] Before step 210, the BMS can first enter pulse charging mode and then determine whether the state of the power battery meets the conditions for pulse charging based on the battery state parameters. If the battery state parameters meet the conditions for pulse charging, the BMS will then execute step 210; if the battery state parameters do not meet the conditions for pulse charging, the BMS will switch from pulse charging mode to DC charging mode.

[0066] Among them, pulse charging mode is a charging mode that uses pulsed voltage or pulsed current, while DC charging mode is a charging mode that uses constant voltage or constant current.

[0067] For example, when the battery status parameter includes battery temperature, if the battery temperature is less than or equal to a temperature threshold (exemplarily, the temperature threshold is 5°C), the BMS determines that the power battery status meets the pulse charging conditions and executes step 110. Alternatively, when the battery status parameter includes SOC, if the SOC is less than or equal to a SOC threshold, the BMS determines that the power battery status meets the pulse charging conditions and executes step 110. Furthermore, when the battery status parameters include both battery temperature and SOC, if the battery temperature is less than and / or equal to a temperature threshold and the SOC is less than or equal to a SOC threshold, the BMS determines that the power battery status meets the pulse charging conditions and executes step 210.

[0068] To address the charging challenges of electric vehicles in low-temperature environments, most electric vehicle batteries on the market are equipped with thermal management systems. When the battery temperature is too low, the thermal management system converts some electrical energy into heat, thus heating the entire battery pack. This preheating method allows the battery to reach a suitable temperature before the charging station begins charging. However, this preheating method, which raises the battery temperature before charging, has limited room for temperature increase, failing to fundamentally solve the problem of excessively long charging times in low-temperature environments. Furthermore, incorporating a thermal management system into the battery not only increases its weight but also its cost.

[0069] In the aforementioned technical solution, under low-temperature conditions, the power conversion device operates in pulse charging mode, converting the DC current output from the charging pile into a pulse current, thereby enabling normal charging of the power battery. Compared to the traditional methods described above, this embodiment eliminates the need for preheating the power battery within the battery pack, significantly shortening charging time and allowing the battery temperature to rise rapidly, effectively improving charging efficiency. Furthermore, since a heating device is not required within the battery pack, this technical solution also reduces the weight and cost of the power battery.

[0070] Conversely, when the battery status parameters include battery temperature, if the battery temperature is greater than the temperature threshold, the BMS determines that the power battery status does not meet the pulse charging conditions, and then the BMS switches from pulse charging mode to DC charging mode.

[0071] In another possible implementation, the BMS can first enter DC charging mode, and then determine whether the battery state meets the conditions for pulse charging based on the battery state parameters. If the battery state parameters meet the conditions for pulse charging, the BMS switches from DC charging mode to pulse charging mode; if the battery state parameters do not meet the conditions for pulse charging, the BMS continues to maintain DC charging mode.

[0072] In another possible embodiment, the BMS can determine whether to enter pulse charging mode or DC charging mode based on the battery status parameters after obtaining them.

[0073] In step 220, the BMS sends pulse charging information to the charging pile.

[0074] The pulse charging information includes pulse charging demand parameters, which indicate the output pulse current of the charging pile. This pulse current is used to charge the power battery. In other words, the pulse charging demand parameters indicate the pulse charging mode.

[0075] For example, the BMS can send a first message to the charging pile, the contents of which can be as shown in Table 2.

[0076] Table 2

[0077]

[0078] It should be noted that the pulse current in the embodiments of this application can also be referred to as a pulse current waveform or a pulse charging waveform.

[0079] If the charging station does not receive charging information from the BMS within a predetermined time, the charging station can terminate the charging process. For example, the predetermined time can be 1 second.

[0080] Alternatively, the charging station can determine that the battery has reached the conditions for DC charging and switch from pulse charging mode to DC charging mode. For example, the charging station can directly switch to DC charging mode; another example is that the charging station can send an inquiry message to the BMS to inquire whether the battery has reached the conditions for DC charging. If the charging station receives a confirmation message from the BMS, it can output DC current to the BMS. If the charging station receives a negative response message (such as a Negative Acknowledgment message) from the BMS, it can immediately stop charging.

[0081] To better align with current charging protocols, the BMS can also send DC charging demand parameters to the charging station. As an example, the first message may include DC charging parameters. As another example, the DC charging demand parameters can be carried in a Battery Charging Request (BCL) message, the specific content of which is shown in Table 3.

[0082] Table 3

[0083]

[0084] Optionally, the BMS can send both the BCL message and the first message to the charging pile simultaneously, or it can send the first message to the charging pile first and then send the BCL message, or the BMS can send the BCL message to the charging pile first and then send the first message. This application embodiment does not specifically limit this.

[0085] In step 230, the charging pile outputs a pulse current to the power battery according to the pulse charging demand parameters. This pulse current is used to charge the power battery.

[0086] Furthermore, method 200 may also include: during pulse charging, the BMS determines in real time whether the state of the power battery meets the conditions for pulse charging. If the current state of the power battery meets the conditions for pulse charging, the BMS continues to maintain the pulse charging mode; if the current state of the power battery does not meet the conditions for pulse charging, the BMS exits the pulse charging mode.

[0087] As an example, the BMS can determine whether the state of the power battery meets the conditions for pulse charging at preset time intervals. For instance, the BMS can determine whether the state of the power battery meets the conditions for pulse charging every 1 second.

[0088] Optionally, the preset time period can be agreed upon by the BMS and the charging station.

[0089] Optionally, the preset time period can be determined by the BMS itself.

[0090] As another example, the BMS can determine whether the battery state meets the conditions for pulse charging when it acquires battery state parameters. In other words, the BMS determines whether the battery state meets the conditions for pulse charging every time it acquires battery state parameters.

[0091] When the current state of the power battery meets the conditions for pulse charging, in order to enable the charging pile to monitor the charging process in real time and output the optimal pulse current suitable for charging the power battery, the BMS can also report pulse charging measurement parameters to the charging pile in real time. These pulse charging measurement parameters may include, but are not limited to, at least one of the following state values: pulse charging voltage measurement value, pulse charging current measurement value, pulse direction, and pulse frequency measurement value. Optionally, the BMS can send a second message to the charging pile, which includes the pulse charging measurement parameters. For example, the content of the second message may be as shown in Table 4.

[0092] Table 4

[0093]

[0094] After receiving the second message, the charging pile can adjust the pulse current output to the power battery in real time based on the pulse charging measurement parameters. In this way, the charging pile can output the pulse current most suitable for the power battery state at the current moment, thereby further improving charging efficiency.

[0095] If the charging station does not receive a second message within, for example, 5 seconds, it can terminate the pulse charging of the power battery. For instance, the charging station can terminate the pulse charging immediately.

[0096] In addition to the first message, the BMS can also send a Battery Charge State (BCS) message to the charging station. The BCS message can include at least one of the following parameters: charging voltage measurement, charging current measurement, highest single-cell power battery voltage and its group number, current SOC, and estimated remaining charging time. For example, the contents of the BCS message can be as shown in Table 5.

[0097] Table 5

[0098]

[0099] Similar to the first message and the BCL message, the BSM can send the second message and the BCS message to the charging station simultaneously, or it can send the second message first and then the BCS message, or it can send the BCS message first and then the second message.

[0100] Furthermore, during pulse charging, in order for the BMS to monitor the pulse current, pulse voltage, and other information output by the charging pile at the current moment, the charging pile can send a third message to the BMS. This third message includes the pulse charging voltage output value, the charging current output value, the pulse direction, and the pulse frequency output value. For example, the contents of the third message are shown in Table 6.

[0101] Table 6

[0102]

[0103] Optionally, if the BMS does not receive a third message within a certain period of time, the BMS can terminate pulse charging. For example, the BMS can immediately terminate pulse charging, or the BMS can switch from pulse charging to DC charging.

[0104] Similarly, to better align with current charging protocols, the BMS can also send DC charging output parameters to the charging station. As an example, the third message may include DC charging output parameters. As another example, the DC charging output parameters may be carried in a Charger Charging State (CCS) message, the specific content of which may be shown in Table 7.

[0105] Table 7

[0106]

[0107] In this embodiment, method 200 may further include: if the battery state parameters reach a parameter threshold, such as a battery temperature of 10°C, the BMS may exit the pulse charging mode. Simultaneously, the BMS may also send an exit command to the charging pile, which instructs the charging pile to exit the pulse charging mode.

[0108] Optionally, the exit instruction may include 1 bit, where bit "1" indicates that the charging station exits the pulse charging mode, and bit "0" indicates that the charging station remains in the pulse charging mode. Alternatively, the exit instruction may include multiple bits; if multiple bits are the same, it indicates that the charging station exits the pulse charging mode; if at least two of the multiple bits are different, it indicates that the charging station remains in the pulse charging mode.

[0109] To more clearly describe the embodiments of this application, the following is combined with... Figure 3 Describe in detail a specific implementation process of method 200. It should be understood that... Figure 3 This is merely intended to help those skilled in the art better understand the embodiments of this application, and is not intended to limit the scope of the embodiments of this application.

[0110] In the 310, the BMS determines whether to enter pulse charging mode based on battery status parameters.

[0111] For example, the BMS compares the battery temperature with a temperature threshold, assuming the temperature threshold is 5°C. If the battery temperature is less than or equal to 5°C, the BMS determines to enter pulse charging mode and executes step 320; if the battery temperature is greater than 5°C, the BMS enters DC charging mode.

[0112] In the 320, the BMS determines the pulse charging requirement parameters based on the battery state parameters.

[0113] The pulse charging requirements include the peak pulse voltage requirement, the effective pulse current requirement, the peak pulse current requirement, the pulse direction requirement, and the pulse frequency requirement.

[0114] In step 330, the BMS sends the first message and the BCL message to the charging pile.

[0115] The first message includes pulse charging requirement parameters, and the BCL message includes voltage requirement value, current requirement value, and charging mode.

[0116] If the charging pile receives the first message and / or the BCL message within 1 second, the charging pile executes step 340; if the charging pile does not receive the first message and / or the BCL message within 1 second, the charging pile immediately ends charging.

[0117] In the 340, the charging pile outputs pulse current to the power battery according to the pulse charging demand parameters.

[0118] In this embodiment, the BMS determines the pulse charging demand parameters based on the battery state parameters of the power battery. Then, the charging pile can output pulse current to the power battery according to the pulse charging demand parameters sent by the BMS. This avoids the problem of the voltage and current range of the charging pile outputting not matching the power battery in some scenarios, thus ensuring the normal charging of the power battery. Furthermore, the battery state parameters are the most representative parameters of the power battery's state, and the pulse current converted based on the battery state parameters can effectively ensure the normal power supply to the power battery.

[0119] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0120] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0121] The charging method of the embodiments of this application has been described in detail above. The power conversion device of the embodiments of this application will be described below. It should be understood that the power conversion device in the embodiments of this application can execute the charging method in the embodiments of this application and has the function of executing the corresponding method.

[0122] Figure 4 A schematic block diagram of a power battery BMS 400 according to an embodiment of this application is shown. Figure 4 As shown, the BMS400 may include:

[0123] The first processing unit 410 is used to determine the pulse charging demand parameters based on the battery state parameters of the power battery.

[0124] The first communication unit 420 is used to send pulse charging information to the charging pile. The pulse charging information includes pulse charging demand parameters, which are used to instruct the charging pile to output pulse current, and the pulse current is used to charge the power battery.

[0125] Optionally, in this embodiment of the application, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0126] Optionally, in this embodiment of the application, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0127] Optionally, in this embodiment of the application, the first processing unit 410 is further configured to: determine, based on the battery state parameters, to enter a pulse charging mode, wherein the pulse charging mode is a charging mode using pulsed voltage or pulsed current.

[0128] Optionally, in this embodiment of the application, the battery state parameters include the battery temperature of the power battery, and the first processing unit 410 is specifically used to: determine to enter the pulse charging mode if the battery temperature is less than or equal to a temperature threshold.

[0129] Optionally, in this embodiment of the application, the first communication unit 420 is further configured to: if the battery temperature is greater than the temperature threshold, send an exit indication message to the charging pile, the exit indication message being used to indicate that the charging pile exits the pulse charging mode.

[0130] It should be understood that the BMS 400 can implement the corresponding operations of the BMS in method 200, which will not be elaborated here for the sake of brevity.

[0131] Figure 5 A schematic block diagram of a charging pile 500 according to an embodiment of this application is shown. The charging pile 500 is used to charge a power battery, such as... Figure 5 As shown, the charging station 500 includes:

[0132] The second communication unit 510 is used to receive pulse charging information sent by the battery management system (BMS) of the power battery. The pulse charging information includes pulse charging demand parameters, which are used to instruct the charging pile to output pulse current, and the pulse current is used to charge the power battery.

[0133] The second processing unit 520 is used to output the pulse current to the power battery according to the pulse charging demand parameters.

[0134] Optionally, in this embodiment of the application, the pulse charging requirement parameters include at least one of the following parameters: pulse current requirement, pulse voltage requirement, pulse direction requirement, pulse frequency requirement, pulse interval requirement, and pulse duration requirement.

[0135] Optionally, in this embodiment, the pulse charging demand parameter is determined based on the battery state parameters of the power battery.

[0136] Optionally, in this embodiment of the application, the battery state parameters include at least one of the following parameters of the power battery: battery temperature, battery voltage, battery capacity, and battery state of charge (SOC).

[0137] Optionally, in this embodiment of the application, the second communication unit 510 is further configured to: receive exit indication information sent by the BMS when the battery temperature of the power battery is greater than a temperature threshold, the exit indication information being used to instruct the charging pile to exit the pulse charging mode, the pulse charging mode being a charging mode using pulsed voltage or pulsed current.

[0138] It should be understood that the charging pile 500 can perform the corresponding operations of the charging pile in method 200, which will not be elaborated here for the sake of simplicity.

[0139] Figure 6 A schematic block diagram of a power battery BMS 600 according to another embodiment of this application is shown. (As...) Figure 6 As shown, the BMS 600 includes a memory 610 and a processor 620. The memory 610 is coupled to the processor 620. The memory 610 is used to store program instructions, and the processor 620 is used to call the program instructions stored in the memory 610 to execute the methods of the various embodiments of this application described above.

[0140] Figure 7 A schematic block diagram of a charging pile 700 according to another embodiment of this application is shown. Figure 7 As shown, the charging pile 700 includes a memory 710 and a processor 720. The memory 710 is coupled to the processor 720. The memory 710 is used to store program instructions, and the processor 720 is used to call the program instructions stored in the memory 710 to execute the methods of the various embodiments of this application described above.

[0141] This application also provides a computer-readable storage medium for storing a computer program that performs the methods described in the various embodiments of this application.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method of charging for charging a power cell, characterized by, The method comprises: The battery state parameters of the power battery include a battery temperature and a state of charge, and the BMS determines that the power battery state satisfies the pulse charging condition if the battery temperature is less than or equal to a temperature threshold and the state of charge is less than or equal to a state of charge threshold; the BMS determines the direct-current charging demand parameter according to the battery state parameters of the power battery, the direct-current charging demand parameter including at least one of the following parameters: a voltage demand value, a current demand value, and an output mode of the charging pile; The BMS determines the pulse charging demand parameter according to the direct-current charging demand parameter; The pulse charging information is sent to the charging pile, the pulse charging information including the pulse charging demand parameter, the pulse charging demand parameter being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery.

2. The method of claim 1, wherein, The pulse charging demand parameter includes at least one of the following parameters: a pulse current demand, a pulse voltage demand, a pulse direction demand, a pulse frequency demand, a pulse interval demand, and a pulse duration demand.

3. The method of claim 1, wherein, The battery state parameters further include at least one of the following parameters of the power battery: a battery voltage and a battery capacity.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: If the battery temperature is greater than the temperature threshold, exit instruction information is sent to the charging pile, the exit instruction information being used to instruct the charging pile to exit the pulse charging mode.

5. A method of charging for charging a power cell, characterized by, The method comprises: The charging pile receives pulse charging information sent by a battery management system (BMS) of the power battery, the pulse charging information including a pulse charging demand parameter, the pulse charging demand parameter being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery, The pulse charging demand parameter is determined by the BMS according to a direct-current charging demand parameter, The direct-current charging demand parameter is determined by the BMS according to battery state parameters of the power battery if the battery temperature is less than or equal to a temperature threshold and the state of charge is less than or equal to a state of charge threshold when the battery state parameters of the power battery include the battery temperature and the state of charge, The direct-current charging demand parameter includes at least one of the following parameters: a voltage demand value, a current demand value, and an output mode of the charging pile; The charging pile outputs the pulse current to the power battery according to the pulse charging demand parameter.

6. The method of claim 5, wherein, The pulse charging demand parameter includes at least one of the following parameters: a pulse current demand, a pulse voltage demand, a pulse direction demand, a pulse frequency demand, a pulse interval demand, and a pulse duration demand.

7. The method according to claim 5 or 6, characterized in that, The battery state parameters further include at least one of the following parameters of the power battery: a battery voltage and a battery capacity.

8. The method according to claim 5 or 6, characterized in that, The method further comprises: The charging pile receives exit instruction information sent by the BMS when the battery temperature of the power battery is greater than a temperature threshold, the exit instruction information being used to instruct the charging pile to exit the pulse charging mode, the pulse charging mode being a charging mode using pulse voltage or pulse current.

9. A battery management system for a power battery, characterized in that The method comprises: The first processing unit is configured to, when the battery state parameter of the power battery includes a battery temperature and a state of charge, determine that a power battery state satisfies a pulse charging condition if the battery temperature is less than or equal to a temperature threshold and the state of charge is less than or equal to a state of charge threshold, determine a direct current charging demand parameter according to the battery state parameter of the power battery, the direct current charging demand parameter including at least one of the following parameters: a voltage demand value, a current demand value, and an output mode of a charging pile; The first processing unit is further configured to determine a pulse charging demand parameter according to the direct current charging demand parameter; The first communication unit is configured to send pulse charging information to the charging pile, the pulse charging information including the pulse charging demand parameter, the pulse charging demand parameter being used to instruct the charging pile to output a pulse current, the pulse current being used to charge the power battery.

10. The battery management system of claim 9, wherein, The pulse charging demand parameter includes at least one of the following parameters: a pulse current demand, a pulse voltage demand, a pulse direction demand, a pulse frequency demand, a pulse interval demand, and a pulse duration demand.

11. The battery management system of claim 9, wherein, The battery state parameter further includes at least one of the following parameters of the power battery: a battery voltage and a battery capacity.

12. The battery management system of any one of claims 9-11, wherein, The first communication unit is further configured to: If the battery temperature is greater than the temperature threshold, send exit instruction information to the charging pile, the exit instruction information being used to instruct the charging pile to exit a pulse charging mode.

Images