A charging control method, a battery management system, a battery pack system and a vehicle

Abstract

An embodiment of the present application provides a charging control method, a battery management system, a battery pack system, and a vehicle, which relate to the technical field of batteries and are used to solve the problem that it is easy to cause unsuccessful charging when the charging control method has inconsistent standards between the charging end and the charged end. The charging control method provided by the embodiment of the present application includes: detecting a CHM message after power-on; detecting a CRM message if the CHM message is not detected within a first preset time; sending an error message if the CHM message is not detected within a second preset time and the CRM message is not detected within a third preset time; wherein the first preset time is greater than or equal to zero and less than the second preset time. The charging control method provided by the embodiment of the present application is used to achieve intelligent control during the charging process.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a charging control method, a battery management system, a battery pack system, and a vehicle. Background Art

[0002] Communication standards are constantly updated, resulting in the coexistence of new and old charging standards. The charging handshake stage of the new national standard charging protocol includes a handshake start stage and a handshake identification stage, and the handshake identification stage is carried out after the handshake start stage is completed. Specifically, during the handshake start stage, the charging end sends a CHM message, the charged end detects the CHM message, and sends a BHM message to the charging end when the CHM message is detected. During the handshake identification stage, the charging end sends a CRM message, the charged end detects the CRM message, and sends a BRM message when the CRM message is detected. The charging handshake stage of the old national standard charging protocol only includes handshake identification, that is, the charging end directly sends a CRM message without sending a CHM message.

[0003] During the charging process, after the physical connection is completed and the low-voltage auxiliary power is turned on, the charging handshake stage is entered. If the charged end detects the CHM message sent by the charging end, it proceeds according to the new national standard charging protocol. If the charged end first detects the CRM message and does not detect the CHM message, it proceeds according to the old national standard charging protocol. Only by accurately switching between the new and old standards can the smooth interaction of information between the charging end and the electric vehicle be ensured, and thus normal charging can be carried out. In the related art, in order to meet the different working requirements of the charging end for the new and old national standard charging protocols, the charged end needs to first detect the CHM message sent by the charging end. After a period of time, if this signal is not detected, the CRM message is detected to determine the new and old charging standards. However, if the charging end directly sends a CRM message, since the charged end will spend a certain amount of time waiting to detect the CHM message, the charged end is prone to a situation where the response to the CRM message times out, resulting in a charging handshake failure. A charging handshake failure will cause the subsequent charging process to be unable to proceed. Therefore, the charging control method in the related art is prone to the problem of unable to charge smoothly when the standards of the charging end and the charged end are inconsistent. Summary of the Invention

[0004] In view of this, the embodiments of the present application provide a charging control method, a battery management system, a battery pack system, and a vehicle to solve the problem that the charging control method is prone to the problem of unable to charge smoothly when the standards of the charging end and the charged end are inconsistent.

[0005] To achieve the above object, a first aspect of the embodiments of the present application provides a charging control method, including: detecting a CHM message after power-on; detecting a CRM message if the CHM message is not detected within a first preset time; sending an error message if the CHM message is not detected within a second preset time and the CRM message is not detected within a third preset time; wherein, the first preset time is greater than or equal to zero and less than the second preset time, and the third preset time is greater than zero.

[0006] In some optional embodiments of the present application, the end time of the second preset time is earlier than or equal to the end time of the third preset time.

[0007] In some optional embodiments of the present application, if the CHM message is detected within the first preset time, a BHM message is sent.

[0008] In some optional embodiments of the present application, after the end time of the first preset time, when the CHM message is detected, the detection of the CRM message is stopped and a BHM message is sent; when the CRM message is detected, the detection of the CHM message is stopped and a BRM message is sent.

[0009] In some optional embodiments of the present application, the end time of the third preset time is earlier than or equal to the end time of the charging end detecting the BRM message.

[0010] In some optional embodiments of the present application, the first preset time is less than or equal to 1 / 2 of the second preset time.

[0011] In some optional embodiments of the present application, the second preset time is 5s.

[0012] In some optional embodiments of the present application, the first preset time is 2s.

[0013] A second aspect of the embodiments of the present application provides a battery management system, which uses the charging control method provided by the first aspect of the embodiments of the present application to charge the battery cells.

[0014] A third aspect of the embodiments of the present application provides a battery pack system, including a plurality of battery cells and the battery management system provided by the second aspect of the embodiments of the present application.

[0015] A fourth aspect of the embodiments of the present application provides a vehicle, including the battery pack system provided by the third aspect of the embodiments of the present application.

[0016] The charging control method provided by the embodiment of the present application detects the CRM message if the CHM message is not detected within the first preset time, that is, it is not necessary to wait until the detection of the CHM message ends before detecting the CRM message. Specifically, the first preset time is less than the second preset time. After the first preset time, the detection of the CRM message starts, but the detection of the CHM message does not stop after the first preset time ends, and the detection of the CHM message will continue until the end moment of the second preset time. Compared with the detection of the CRM message after the end moment of the detection of the CHM message, the time before the detection of the CRM message will be shortened. If the charging end directly sends the CRM message, the charged end can detect it faster and it is not easy to have the situation of response timeout for the CRM message. Therefore, the charging control method provided by the embodiment of the present application can solve the problem that it is easy to cause unsuccessful charging when the charging control methods of the charging end and the charged end are inconsistent. Description of the Drawings

[0017] Figure 1 It is a schematic flowchart of the charging control method in some embodiments of the present application;

[0018] Figure 2 It is a schematic flowchart of the charging control method in other embodiments of the present application;

[0019] Figure 3 It is a schematic flowchart of the charging control method in still other embodiments of the present application;

[0020] Figure 4 It is a schematic flowchart of the charging control method in yet other embodiments of the present application. Detailed Embodiments

[0021] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the detailed embodiments should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation of the present application.

[0022] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0023] In addition, in the embodiments of the present application, orientation terms such as "upper", "lower", "left", and "right" are defined relative to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and they can change accordingly with the change of the orientation of the components placed in the drawings.

[0024] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium.

[0025] In the embodiments of the present application, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising such element.

[0026] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0027] The embodiments of the present application provide a vehicle, including a battery pack system. The battery pack system is used to supply power to the vehicle. The power supply can be implemented in various forms. For example, it can provide electrical energy for starting the vehicle engine, provide electrical energy for in-vehicle electronic devices, or be used as the power for an electric vehicle or an electric bicycle to drive the electric vehicle or the electric bicycle to travel, etc. In some other embodiments of the present application, the battery pack system can also be used in other scenarios. For example, home energy storage, grid energy storage, power tools, providing closing current for substations and power units, providing backup power for public facilities, and power supply for communication, etc.

[0028] The battery pack system includes multiple battery cells and a battery management system. The battery management system is BMS (Battery Management System). The BMS is used to estimate the state of charge of the battery pack system, monitor the working state of the battery pack system, and balance the charging of multiple battery cells of the battery pack system, etc., to prevent over-discharge and over-charging of the battery pack system and extend the service life of the battery pack system. Among them, estimating the state of charge of the battery pack system means estimating the remaining power of the battery pack system, and monitoring the working state of the battery pack system means collecting the voltage, temperature, current, etc. of the battery pack system.

[0029] In the embodiment of the present application, the battery management system applies a charging control method to charge the battery cells. In the related art, during the charging handshake phase, if the charged end detects the CHM message sent by the charging end, it proceeds according to the new national standard charging protocol. If the charged end first detects the CRM message and does not detect the CHM message, it proceeds according to the old national standard charging protocol. It should be explained that the charging end is generally a device for supplying power such as a charger or a charging pile, and the charged end generally refers to a rechargeable battery. Only by accurately switching between the new and old standards can the information between the charging end and the electric vehicle be smoothly exchanged, and then normal charging can be carried out. In the related art, in order to meet the different working requirements of the charging end for the new and old national standard charging protocols, the charged end needs to first detect the CHM message sent by the charging end. After a period of time, if this signal is not detected, then detect the CRM message to judge the new and old charging standards. However, if the charging end directly sends the CRM message, since the charged end will spend a certain amount of time waiting to detect the CHM message, the charged end is prone to the situation of response timeout for the CRM message, and the charging handshake fails. The failure of the charging handshake will cause the subsequent charging process to be unable to proceed. Therefore, the charging control method in the related art is prone to the problem of unable to charge smoothly when the standards of the charging end and the charged end are inconsistent.

[0030] In view of this, the charging control method provided in the embodiment of the present application includes: detecting the CHM message after power-on; detecting the CRM message if the CHM message is not detected within the first preset time; sending an error message if the CHM message is not detected within the second preset time and the CRM message is not detected within the third preset time; where the first preset time is greater than or equal to zero and less than the second preset time, and the third preset time is greater than zero. Please refer to Figure 1 , the charging control method in the embodiment of the present application includes the following steps:

[0031] Step S101, detecting the CHM message after power-on;

[0032] Step S102, determining whether the CHM message is detected within the first preset time;

[0033] Step S103, if not, detect the CRM message;

[0034] Step S104, determine whether the CHM message is detected within a second preset time, or the CRM message is detected within a third preset time;

[0035] Step S105, if not, send an error message.

[0036] In this way, when the device to be charged does not detect the CHM message within the first preset time and detects the CRM message, it means that the device to be charged does not have to wait until the detection of the CHM message is completed before detecting the CRM message. The first preset time is less than the second preset time. After the first preset time, the device to be charged starts to detect the CRM message, but the detection of the CHM message does not stop after the first preset time ends. The detection of the CHM message will continue until the end of the second preset time. Compared with the detection of the CRM message after the end of the detection of the CHM message, the time before the detection of the CRM message will be relatively shortened. If the charging device directly sends the CRM message, the device to be charged can detect it faster and is not likely to time out in response to the CRM message. Therefore, the charging control method provided by the embodiments of the present application can solve the problem that it is easy to cause unsuccessful charging when the charging standards of the charging device and the device to be charged are inconsistent.

[0037] Specifically, if the device to be charged does not detect the CHM message within the first preset time, it is impossible to determine whether the charging device uses the new national standard charging protocol or the old national standard charging protocol. If the charging device uses the old national standard charging protocol, waiting until the detection of the CHM message is completed before detecting the CRM message may cause a timeout in the CRM response. Therefore, the device to be charged detects the CRM message before the detection of the CHM message is completed. After the first preset time, the device to be charged detects the CHM message and the CRM message simultaneously within a certain time, which is beneficial for the device to be charged to avoid the situation of timeout in response to the CRM message.

[0038] It should be explained that the end time of the second preset time is the timeout time when the device to be charged detects the CHM message, and the end time of the third preset time is the timeout time when the device to be charged detects the CRM message.

[0039] It should be explained that the first preset time, the second preset time, and the third preset time all refer to time periods. That the above time period is greater than zero means that the interval between the start time and the end time of the time period is greater than zero, and that the above time period is equal to zero means that the interval between the start time and the end time of the time period is equal to zero. In addition, the start time of the second preset time is the start time of the CHM message, that is, the start time of the first preset time. That the first preset time is less than the second preset time means that the end time of the first preset time is earlier than the end time of the second preset time.

[0040] In addition, since the time before the detection of the CRM message in the charging control method in the embodiments of the present application is shortened, in the case where the charging end directly sends the CRM message, the charged end can also identify it more quickly, which is beneficial to improving the charging efficiency.

[0041] It should be noted that the first preset time can be equal to zero. Please refer to Figure 2 , in the case where the first preset time is equal to zero, the charging control method includes the following steps:

[0042] Step S201, detect the CHM message and the CRM message after power-on;

[0043] Step S202, determine whether the CHM message is detected within the second preset time, or the CRM message is detected within the third preset time;

[0044] Step S203, if not, send an error message.

[0045] In this case, the detection of the CRM message does not require waiting for a period of time, that is, the CRM message and the CHM message start to be detected at the same time, which is beneficial to improving the charging efficiency. Of course, in some other embodiments of the present application, the first preset time can be greater than zero. In this case, the detection of the CRM message needs to wait for a period of time before starting, which helps to reduce energy consumption and is also beneficial to improving the accuracy of CHM message detection. The staff can make a choice according to the actual situation.

[0046] Preferably, in some alternative embodiments of the present application, the first preset time is less than or equal to 1 / 2 of the second preset time. In this way, on the one hand, the detection of the CRM message is relatively timely, and it is not easy to have a situation of response timeout for the CRM message. On the other hand, a relatively appropriate time is reserved for separately detecting the CHM message, which helps to reduce energy consumption and improve the accuracy of CHM message detection. Preferably, in some alternative embodiments, the second preset time is 5 s. On this basis, preferably, in some alternative embodiments, the first preset time is 2 s.

[0047] Preferably, in some alternative embodiments of the present application, the termination moment of the second preset time is earlier than or equal to the termination moment of the third preset time. In this way, the lengths of both the second preset time and the third preset time are relatively appropriate, without wasting resources due to too long a detection time, nor failing to detect the corresponding message due to too short a detection time. Specifically, for the termination moment of the second preset time being equal to the termination moment of the third preset time, that is, the timeout moment for the detection of the CRM message is the same as the timeout moment for the detection of the CHM message. In this way, the detection time of the CHM message is relatively long, which is beneficial to improving the accuracy of obtaining the CHM message. For the termination moment of the second preset time being earlier than the termination moment of the third preset time, that is, the timeout moment for the detection of the CRM message is earlier than the timeout moment for the detection of the CHM message. In this way, appropriately shortening the detection time of the CHM message is beneficial to improving the accuracy of detecting the CRM message and also beneficial to reducing resource consumption.

[0048] Preferably, in some alternative embodiments of the present application, the first preset time is zero, and the second preset time is the same as the third preset time. In this way, that is, the device being charged starts to detect the CHM message and the CRM message simultaneously, and the timeout moment for the detection of the CRM message is the same as the timeout moment for the detection of the CHM message, which is beneficial to improving the charging efficiency.

[0049] Preferably, in some alternative embodiments of the present application, the termination moment of the third preset time is earlier than or equal to the termination moment when the charging device detects the BRM message. In this way, the timeout moment for the CRM message detection is within a suitable time range, which is beneficial for the device being charged to avoid response timeout for the CRM message. It should be explained that here the charging device refers to the charging device of the old national standard charging protocol, that is, the charging device that only sends the BRM message without sending the CHM message. It can be understood that when the condition that the termination moment of the third preset time is earlier than or equal to the termination moment when the charging device of the old national standard charging protocol detects the BRM message is satisfied, the condition that the termination moment of the third preset time is earlier than or equal to the termination moment when the charging device of the new national standard charging protocol detects the BRM message can also be satisfied.

[0050] Further, in some alternative embodiments of the present application, when a CHM message is detected within the first preset time, a BHM message is sent. Please refer to Figure 3 , the charging control method in this embodiment includes the following steps:

[0051] Step S301, detect the CHM message after power-on;

[0052] Step S302, determine whether a CHM message is detected within the first preset time;

[0053] Step S303, if so, send a BHM message;

[0054] Step S304, if not, detect the CRM message;

[0055] Step S305, determine whether the CHM message is detected within the second preset time, or the CRM message is detected within the third preset time;

[0056] Step S306, if not, send an error message.

[0057] In this way, if the CHM message is detected by the charged end within the first preset time, it indicates that the charging end adopts the new national standard charging protocol, and the charged end can send the BHM to start the charging phase. It can be understood that in this embodiment, after the charging start phase ends, the charged end detects the CRM message to enter the charging identification phase.

[0058] Further, in some optional embodiments of the present application, after the termination moment of the first preset time, when the CHM message is detected, stop detecting the CRM message and send the BHM message; when the CRM message is detected, stop detecting the CHM message and send the BRM message. Please refer to Figure 4 , the charging control method in this embodiment includes the following steps:

[0059] Step S401, detect the CHM message after power-on;

[0060] Step S402, determine whether the CHM message is detected within the first preset time;

[0061] Step S403, if not, detect the CRM message;

[0062] Step S404, determine whether the CHM message is detected within the second preset time, or the CRM message is detected within the third preset time;

[0063] Step S405, when the CHM message is received, stop receiving the CRM message and send the BHM message;

[0064] Step S406, when the CRM message is received, stop receiving the CHM message and send the BRM message;

[0065] Step S407, if not, send an error message.

[0066] If the device to be charged does not detect the CHM message within the first preset time, it is impossible to determine whether the charging device uses the new national standard charging protocol or the old national standard charging protocol. After the first preset time, the device to be charged detects the CHM message and the CRM message simultaneously within a certain period of time. If the CHM message is detected, it indicates that the charging device uses the new national standard charging protocol, and the BHM message is sent to start the charging phase; if the device to be charged directly detects the CRM message, it indicates that the charging device uses the old national standard charging protocol, and the device to be charged sends the BRM message to enter the charging identification phase.

[0067] After the charging handshake is successful, enter the parameter configuration phase. The device to be charged sends the battery charging parameter message to the charging device. After receiving the time synchronization and the maximum output capacity parameter of the charging device (the new national standard charging protocol adds the minimum output current compared with the old national standard charging protocol), the device to be charged sends a request to apply high voltage, and sends a charging ready message to the charging device after the high voltage is applied. After receiving the output ready message from the charging device, enter the charging phase.

[0068] During the charging phase, the device to be charged sends the total battery charging status and battery charging demand messages to the charging device, and the charging device sends the charging status of the charging device to the device to be charged. Subsequently, the device to be charged sends the total battery charging status and battery status information to the charging device. After the charging stop condition is triggered, the device to be charged or the charging device sends an abort charging message. After aborting the charging, the device to be charged sends the charging statistics message of the device to be charged to the charging device. After receiving the reply of the charging device statistics message, the high voltage is removed and the charging ends. In this phase, the differences between the new national standard charging protocol and the old national standard charging protocol are as follows: the CCS message adds an allow charging signal, and the CCS message timeout judgment is 1 s; the abort charging reason in the BST message adds the charging device actively aborting; the fault reason in the BST message adds the high voltage relay fault and the detection point 2 fault; the abort charging reason in the CST message adds the device to be charged actively aborting; the BEM and CEM messages add other fault reserved bits.

[0069] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging control method, characterized in that, Including: Detect the CHM message after power-on; If the CHM message is not detected within the first preset time, detect the CRM message; If the CHM message is not detected within the second preset time and the CRM message is not detected within the third preset time, send an error message; Wherein, the first preset time is greater than or equal to zero and less than the second preset time, and the third preset time is greater than zero.

2. The charging control method according to claim 1, wherein The end moment of the second preset time is earlier than or equal to the end moment of the third preset time.

3. The charging control method according to claim 1, wherein If the CHM message is detected within the first preset time, send the BHM message.

4. The charging control method according to claim 1, wherein After the end moment of the first preset time, when the CHM message is detected, stop detecting the CRM message and send the BHM message; when the CRM message is detected, stop detecting the CHM message and send the BRM message.

5. The charging control method according to claim 1, characterized in that The end moment of the third preset time is earlier than or equal to the end moment when the charging end detects the BRM message.

6. The charging control method according to any one of claims 1 to 5, characterized in that The first preset time is less than or equal to 1 / 2 of the second preset time.

7. The charging control method according to claim 6, wherein The first preset time is 2s.

8. A battery management system, characterized in that, The battery management system charges the battery cells by using the charging control method according to any one of claims 1 to 7.

9. A battery pack system, characterized in that, Including a plurality of battery cells and the battery management system according to claim 8.

10. A vehicle, characterized in that, Including the battery pack system according to claim 9.

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