Charging / discharging control circuit for vehicle, and voltage box for vehicle

Abstract

Disclosed in the present application are a charging / discharging control circuit for a vehicle, and a voltage box for a vehicle. The circuit comprises a main control module, a plurality of charging / discharging branches, and switch control modules each corresponding to one charging / discharging branch. The main control module is used for: collecting a battery parameter of each charging / discharging branch; on the basis of the battery parameters of all the charging / discharging branches, determining a charging / discharging sequence parameter of each charging / discharging branch; and on the basis of the charging / discharging sequence parameters of all the charging / discharging branches, sequentially performing closing control on the switch control module corresponding to each charging / discharging branch, so as to perform charging and discharging operations on all the charging / discharging branches by means of all target charging modules. In this way, the reliability and accuracy of battery monitoring performed by the charging / discharging control circuit for a vehicle can be improved, and the reliability and accuracy of charging and discharging control performed by the charging / discharging control circuit for a vehicle can further be improved. Thus, when a vehicle has a fault, the vehicle can limp to a repair station at low power, thereby improving vehicle repair efficiency and reducing labor costs for repair.

Description

Vehicle charging and discharging control circuit and vehicle voltage box

[0001] The present application claims priority from the Chinese patent application No. 202422412439.7 filed on September 30, 2024, and entitled "A vehicle charging and discharging control circuit and vehicle voltage box", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of charging and discharging control circuit, in particular to a vehicle charging and discharging control circuit and vehicle voltage box. BACKGROUND

[0003] In the field of commercial vehicles, especially for heavy trucks and other high-load, long-range commercial vehicles, the design and optimization of high-voltage battery systems have become the key to improving vehicle performance and economic efficiency. The traditional high-voltage box design of commercial vehicles mostly adopts single-branch, double-branch, triple-branch or quadruple-branch high-low voltage control architecture. This design meets the basic charging and discharging needs to some extent, but as the demand for electric capacity and fast charging capacity of vehicles grows, its limitations become increasingly apparent.

[0004] Specifically, while the traditional multi-branch design improves the total power output of the battery system, it also faces the risk of overcharging individual cells, which not only affects the service life and safety of the battery, but also threatens the stability of the entire battery system. In addition, the complex road operating environment and high load requirements of commercial vehicles place higher demands on the reliability and fault response capability of the high-low voltage control circuit of the high-voltage box.

[0005] However, the traditional control circuit often lacks the function of automatically cutting off the faulty branch and reducing the overall output power to achieve "limp mode" driving to the repair station when encountering a branch fault. This defect causes the vehicle to have to rely on external maintenance personnel to go to the scene for processing after a fault occurs, not only increasing maintenance costs and time costs, but also seriously affecting the customer's operational efficiency and experience. Therefore, it is particularly important to provide a technical solution that can improve the accuracy of high-low voltage control of vehicle high-voltage boxes. TECHNICAL PROBLEM

[0006] Therefore, the problem to be solved by the present application is to provide a vehicle charging and discharging control circuit that can improve the battery monitoring reliability and accuracy of the vehicle charging and discharging control circuit, thereby improving the charging and discharging control reliability and accuracy of the vehicle charging and discharging control circuit, so that the vehicle can limp to the repair station at low power when a fault occurs, improving vehicle repair efficiency and reducing personnel maintenance costs. TECHNICAL SOLUTION

[0007] To solve the above technical problems, the first aspect of the present application discloses a vehicle charging and discharging control circuit, the control circuit comprises a master control module, a plurality of charging and discharging branches and a switch control module corresponding to each of the charging and discharging branches, wherein:

[0008] The voltage collection end of the master control module is electrically connected to the voltage end of all the charging and discharging branches, and the control end of the master control module is electrically connected to the controlled end of the switch control module corresponding to all the charging and discharging branches. The control end of the switch control module corresponding to each of the charging and discharging branches is electrically connected to the controlled end of the charging and discharging branch, and the feedback end of the switch control module corresponding to each of the charging and discharging branches is used to electrically connect the controlled end of the corresponding target charging module.

[0009] The master control module is used to collect the battery parameters of each of the charging and discharging branches, and determine the charging and discharging sequence parameters of each of the charging and discharging branches according to the battery parameters of all the charging and discharging branches. According to the charging and discharging sequence parameters of all the charging and discharging branches, the switch control module corresponding to each of the charging and discharging branches is controlled to be closed in sequence, so as to perform charging and discharging operation on all the charging and discharging branches through all the target charging modules.

[0010] As an optional implementation, in the first aspect of the present application, the master control module comprises a first master control device and a second master control device, wherein:

[0011] The voltage collection end of the second master control device is electrically connected to the voltage end of all the charging and discharging branches, the data transmission end of the second master control device is electrically connected to the data receiving end of the first master control device, and the control end of the first master control device is electrically connected to the controlled end of the switch control module corresponding to all the charging and discharging branches.

[0012] The second master control device is used to collect the battery parameters of each of the charging and discharging branches when charging operation needs to be performed on all the charging and discharging branches, and determine the branch voltage parameters of each of the charging and discharging branches according to the battery parameters of all the charging and discharging branches. The branch voltage parameters of all the charging and discharging branches are transmitted to the first master control device.

[0013] The first master control device is used to determine the charging sequence parameters of each of the charging and discharging branches according to the branch voltage parameters of all the charging and discharging branches, and control the switch control module corresponding to each of the charging and discharging branches to be closed in sequence according to the charging sequence parameters of all the charging and discharging branches, so as to perform charging operation on all the charging and discharging branches through all the target charging modules. The smaller the branch voltage parameters of the charging and discharging branch are, the earlier the charging sequence parameters of the charging and discharging branch are.

[0014] As an optional implementation, in the first aspect of the present application, the second master device is further configured to collect the battery parameters of each of the charge-discharge branches when discharge operation is required on all the charge-discharge branches, and determine the branch voltage parameter of each of the charge-discharge branches according to the battery parameters of all the charge-discharge branches; and transmit the branch voltage parameters of all the charge-discharge branches to the first master device.

[0015] The first master device is further configured to determine the discharge sequence parameter of each of the charge-discharge branches according to the branch voltage parameters of all the charge-discharge branches, and sequentially control the switch control module corresponding to each of the charge-discharge branches to be closed according to the discharge sequence parameters of all the charge-discharge branches, so as to perform discharge operation on all the charge-discharge branches through all the target charging modules; the greater the branch voltage parameter of the charge-discharge branch is, the earlier the discharge sequence parameter of the charge-discharge branch is.

[0016] As an optional implementation, in the first aspect of the present application, the first master device is specifically configured to:

[0017] determine the charging voltage value of a target charging branch currently in a charging state from all the charge-discharge branches according to the charging sequence parameters of all the charge-discharge branches;

[0018] determine the first voltage difference between the target charging branch and a next charging branch corresponding to the target charging branch which is to perform charging operation next according to the charging voltage value of the target charging branch and the branch voltage parameter of the next charging branch, and judge whether the first voltage difference is less than a preset first voltage difference threshold value;

[0019] when it is judged that the first voltage difference is less than the first voltage difference threshold value, control the switch control module corresponding to the next charging branch to be closed, so as to perform charging operation on the next charging branch;

[0020] updating the next charging branch as the target charging branch, and repeating the determining of the charging voltage value of the target charging branch currently in the charging state from all the charging and discharging branches according to the charging sequence parameters of all the charging and discharging branches; determining the first voltage difference between the target charging branch and a next charging branch corresponding to the target charging branch for the next charging operation according to the charging voltage value of the target charging branch and a branch voltage parameter of the next charging branch, and judging whether the first voltage difference is less than a preset first voltage difference threshold; when it is judged that the first voltage difference is less than the first voltage difference threshold, performing closed control on a switch control module corresponding to the next charging branch to perform the charging operation on the next charging branch; and updating the next charging branch as the target charging branch to perform the charging operation on all the charging and discharging branches by all the target charging modules.

[0021] As an optional implementation, in the first aspect of the application, the first master device is specifically used for:

[0022] determining the discharging voltage value of the target discharging branch currently in the discharging state from all the charging and discharging branches according to the discharging sequence parameters of all the charging and discharging branches;

[0023] determining the second voltage difference between the target discharging branch and a next discharging branch corresponding to the target discharging branch for the next discharging operation according to the discharging voltage value of the target discharging branch and a branch voltage parameter of the next discharging branch, and judging whether the second voltage difference is less than a preset second voltage difference threshold;

[0024] when it is judged that the second voltage difference is less than the second voltage difference threshold, performing closed control on a switch control module corresponding to the next discharging branch to perform the discharging operation on the next discharging branch by a target charging module corresponding to the next discharging branch;

[0025] updating the next discharging branch as the target discharging branch, and repeating the determining of the discharging voltage value of the target discharging branch currently in the discharging state from all the charging and discharging branches according to the discharging sequence parameters of all the charging and discharging branches; determining a second voltage difference between the target discharging branch and a next discharging branch corresponding to the target discharging branch which is to be discharged next according to the discharging voltage value of the target discharging branch and the branch voltage parameter of the next discharging branch, and judging whether the second voltage difference is less than a preset second voltage difference threshold; when it is judged that the second voltage difference is less than the second voltage difference threshold, performing closed control on the switch control module corresponding to the next discharging branch to discharge the next discharging branch through the target charging module corresponding to the next discharging branch; and updating the next discharging branch as the target discharging branch to discharge all the charging and discharging branches through all the target charging modules.

[0026] As an optional implementation form, in the first aspect of the present application, the master control module is further configured to:

[0027] After the charging and discharging operation is performed on all the charging and discharging branches, the expected voltage change of each charging and discharging branch is determined, and the open control parameter of the switch control module corresponding to each charging and discharging branch is determined according to the expected voltage change of each charging and discharging branch; and the open control is performed on the switch control module corresponding to all the charging and discharging branches according to the open control parameters of the switch control modules corresponding to all the charging and discharging branches.

[0028] As an optional implementation form, in the first aspect of the present application, the control circuit further comprises an electric parameter monitoring module corresponding to each target charging module, wherein:

[0029] The control end of the switch control module corresponding to each charging and discharging branch is electrically connected to the controlled end of the electric parameter monitoring module corresponding to the target charging module, and the control end of the electric parameter monitoring module corresponding to each target charging module is electrically connected to the controlled end of the target charging module.

[0030] The electric parameter monitoring module corresponding to each target charging module is configured to monitor the charging and discharging parameter corresponding to the target charging module during the charging and discharging operation performed on all the charging and discharging branches by all the target charging modules, and judge whether the charging and discharging parameter is greater than or equal to a preset charging and discharging parameter threshold; if yes, the target charging module is controlled to be opened.

[0031] As an optional implementation, in the first aspect of the application, the electric parameter monitoring module corresponding to each target charging module comprises a fuse corresponding to the target charging module and an analog Hall sensor, wherein for each target charging module:

[0032] The first end of the fuse corresponding to the target charging module is electrically connected to the control end of the switch control module corresponding to the corresponding charging and discharging branch, the second end of the fuse corresponding to the target charging module is electrically connected to the first end of the analog Hall sensor corresponding to the target charging module, and the second end of the analog Hall sensor corresponding to the target charging module is used to electrically connect the controlled end of the target charging module.

[0033] As an optional implementation, in the first aspect of the application, the switch control module corresponding to each charging and discharging branch comprises a relay corresponding to the charging and discharging branch; and the battery parameter comprises at least one of a battery voltage parameter, a battery temperature parameter, a battery current parameter and a battery health state parameter.

[0034] The second aspect of the application discloses a vehicle voltage box, which comprises the vehicle charging and discharging control circuit according to any one of the first aspect. Advantages

[0035] The application has the following advantages:

[0036] The application provides a vehicle charging and discharging control circuit, which comprises a master control module, a plurality of charging and discharging branches and a switch control module corresponding to each charging and discharging branch, wherein: the master control module is used to collect battery parameters of each charging and discharging branch, and determine charging and discharging sequence parameters of each charging and discharging branch according to the battery parameters of all charging and discharging branches; and the switch control module corresponding to each charging and discharging branch is controlled to be closed in turn according to the charging and discharging sequence parameters of all charging and discharging branches, so as to perform charging and discharging operations on all charging and discharging branches through all target charging modules. In this way, the battery monitoring reliability and accuracy of the vehicle charging and discharging control circuit can be improved, and then the charging and discharging control reliability and accuracy of the vehicle charging and discharging control circuit can be improved, so that the vehicle can limp to a repair station at low power when a fault occurs, and the vehicle repair efficiency can be improved and the personnel repair cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] FIG. 1 is a structural schematic diagram of a vehicle charging and discharging control circuit disclosed by an embodiment of the application;

[0038] FIG. 2 is a structural schematic diagram of another vehicle charging and discharging control circuit disclosed by an embodiment of the application;

[0039] FIG. 3 is a structural schematic diagram of a vehicle voltage box disclosed by an embodiment of the application. Embodiments of the present application

[0040] Embodiment one

[0041] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle charging and discharging control circuit disclosed by the embodiments of the present application. The control circuit can be applied to pure electric vehicles, plug-in hybrid electric vehicles, commercial vehicles, heavy-duty vehicles, etc. The embodiments of the present application are not limited. As shown in FIG. 1, the vehicle charging and discharging control circuit comprises a master control module 101, a plurality of charging and discharging branches 102, and a switch control module 103 corresponding to each charging and discharging branch 102, wherein:

[0042] The voltage collection end of the master control module 101 is electrically connected to the voltage end of all charging and discharging branches 102. The control end of the master control module 101 is electrically connected to the controlled end of the switch control module 103 corresponding to all charging and discharging branches 102. The control end of the switch control module 103 corresponding to each charging and discharging branch 102 is electrically connected to the controlled end of the charging and discharging branch 102. The feedback end of the switch control module 103 corresponding to each charging and discharging branch 102 is used to electrically connect the controlled end of the corresponding target charging module 104.

[0043] The master control module 101 is used to collect the battery parameters of each charging and discharging branch 102, and determine the charging and discharging sequence parameters of each charging and discharging branch 102 according to the battery parameters of all charging and discharging branches 102. According to the charging and discharging sequence parameters of all charging and discharging branches 102, the switch control module 103 corresponding to each charging and discharging branch 102 is controlled to be closed in turn, so that all charging and discharging branches 102 are charged and discharged by all target charging modules 104.

[0044] In the present application, the battery parameters can include at least one of the battery voltage parameter, the battery temperature parameter, the battery current parameter, and the battery health state parameter. As shown in FIG. 2, each charging and discharging branch 102 can comprise a battery total positive and a corresponding battery total negative (such as the battery total positive 1 and the battery total negative 1, the battery total positive 2 and the battery total negative 2, the battery total positive 3 and the battery total negative 3, etc. in FIG. 2). The switch control module 103 corresponding to each charging and discharging branch 102 comprises a relay corresponding to the charging and discharging branch 102 (such as the relay 1 corresponding to the battery total positive 1 and the battery total negative 1, the relay 2 corresponding to the battery total positive 2 and the battery total negative 2, the relay 3 corresponding to the battery total positive 3 and the battery total negative 3, etc. in FIG. 2), and a target charging module, i.e. the super charging gun 1~4 in FIG. 2.

[0045] It can be seen that the vehicle charging and discharging control circuit described in Figure 1 can improve the battery monitoring reliability and accuracy of the vehicle charging and discharging control circuit by constructing the main control module and the corresponding switch control module of each charging and discharging branch, thereby improving the charging and discharging control reliability and accuracy of the vehicle charging and discharging control circuit, so that the vehicle can limp to the repair station at low power when a fault occurs, improving vehicle repair efficiency and reducing personnel repair costs.

[0046] In an optional embodiment, as shown in Figure 2, the main control module 101 includes a first main control device and a second main control device, wherein:

[0047] The voltage collection end of the second main control device is electrically connected to the voltage end of all charging and discharging branches 102, the data transmission end of the second main control device is electrically connected to the data receiving end of the first main control device, and the control end of the first main control device is electrically connected to the controlled end of the corresponding switch control module 103 of all charging and discharging branches 102.

[0048] The second main control device is configured to collect battery parameters of each charging and discharging branch 102 when charging operation is required for all charging and discharging branches 102, and determine branch voltage parameters of each charging and discharging branch 102 according to the battery parameters of all charging and discharging branches 102; and transmit the branch voltage parameters of all charging and discharging branches 102 to the first main control device.

[0049] The first main control device is configured to determine charging sequence parameters of each charging and discharging branch 102 according to the branch voltage parameters of all charging and discharging branches 102, and sequentially control the corresponding switch control module 103 of each charging and discharging branch 102 according to the charging sequence parameters of all charging and discharging branches 102, so as to perform charging operation on all charging and discharging branches 102 through all target charging modules 104; the smaller the branch voltage parameter of the charging and discharging branch 102, the earlier the charging sequence parameter of the charging and discharging branch 102.

[0050] In this optional embodiment, further, the second main control device is also configured to collect battery parameters of each charging and discharging branch 102 when discharging operation is required for all charging and discharging branches 102, and determine branch voltage parameters of each charging and discharging branch 102 according to the battery parameters of all charging and discharging branches 102; and transmit the branch voltage parameters of all charging and discharging branches 102 to the first main control device.

[0051] The first master device is also configured to determine a discharging sequence parameter of each of the charging and discharging branches 102 according to the branch voltage parameters of all the charging and discharging branches 102, and sequentially control the switch control module 103 corresponding to each of the charging and discharging branches 102 to close, so as to perform discharging operation on all the charging and discharging branches 102 by all the target charging modules 104. The greater the branch voltage parameter of the charging and discharging branch 102 is, the earlier the discharging sequence parameter of the charging and discharging branch 102 is.

[0052] In this optional embodiment, further, the first master device is specifically configured to:

[0053] determine the charging voltage value of the target charging branch currently in the charging state from all the charging and discharging branches 102 according to the charging sequence parameters of all the charging and discharging branches 102;

[0054] determine the first voltage difference between the target charging branch and the next charging branch corresponding to the target charging branch according to the charging voltage value of the target charging branch and the branch voltage parameter of the next charging branch, and judge whether the first voltage difference is less than a preset first voltage difference threshold value;

[0055] when it is judged that the first voltage difference is less than the first voltage difference threshold value, control the switch control module 103 corresponding to the next charging branch to close, so as to perform charging operation on the next charging branch by the target charging module 104 corresponding to the next charging branch;

[0056] update the next charging branch to the target charging branch, and repeatedly perform the steps of determining the charging voltage value of the target charging branch currently in the charging state from all the charging and discharging branches 102 according to the charging sequence parameters of all the charging and discharging branches 102, determining the first voltage difference between the target charging branch and the next charging branch corresponding to the target charging branch according to the charging voltage value of the target charging branch and the branch voltage parameter of the next charging branch, judging whether the first voltage difference is less than the first voltage difference threshold value, and controlling the switch control module 103 corresponding to the next charging branch to close when it is judged that the first voltage difference is less than the first voltage difference threshold value, so as to perform charging operation on the next charging branch by the target charging module 104 corresponding to the next charging branch, and updating the next charging branch to the target charging branch, so as to perform charging operation on all the charging and discharging branches 102 by all the target charging modules 104.

[0057] Further, the first master device is specifically configured to:

[0058] According to the discharging sequence parameters of all the charging and discharging branches 102, the discharging voltage value of the target discharging branch currently in the discharging state is determined from all the charging and discharging branches 102;

[0059] According to the discharging voltage value of the target discharging branch, and the branch voltage parameter of the next discharging branch corresponding to the target discharging branch which is to be subjected to the next discharging operation, the second voltage difference value between the target discharging branch and the next discharging branch is determined, and it is judged whether the second voltage difference value is less than the preset second voltage difference threshold value;

[0060] When it is judged that the second voltage difference value is less than the second voltage difference threshold value, the next discharging branch corresponding switch control module 103 is subjected to the closing control, so as to perform the discharging operation on the next discharging branch by the target charging module 104 corresponding to the next discharging branch;

[0061] The next discharging branch is updated as the target discharging branch, and the steps of determining the discharging voltage value of the target discharging branch currently in the discharging state from all the charging and discharging branches 102 according to the discharging sequence parameters of all the charging and discharging branches 102, determining the second voltage difference value between the target discharging branch and the next discharging branch according to the discharging voltage value of the target discharging branch and the branch voltage parameter of the next discharging branch corresponding to the target discharging branch which is to be subjected to the next discharging operation, and judging whether the second voltage difference value is less than the preset second voltage difference threshold value are repeatedly executed. When it is judged that the second voltage difference value is less than the second voltage difference threshold value, the next discharging branch corresponding switch control module 103 is subjected to the closing control, so as to perform the discharging operation on the next discharging branch by the target charging module 104 corresponding to the next discharging branch. The next discharging branch is updated as the target discharging branch, so as to perform the discharging operation on all the charging and discharging branches 102 by all the target charging modules 104.

[0062] For example, as shown in FIG. 2, each charging and discharging branch is provided with a relay, which is controlled by the first main control device and the second main control device (i.e., main control 1 and main control 2) to realize the automatic branch disconnecting limp home of the vehicle. When the battery is in the end-of-life period, due to the large voltage difference of each charging and discharging branch, it is possible that each charging and discharging branch cannot be connected in parallel. At this time, the strategy is as follows:

[0063] 1) When charging, according to the battery parameters of each charging and discharging branch, the relay of the low-voltage branch is first closed to charge the charging and discharging branch by using the current. When the voltage difference between the charging and discharging branch and the next charging branch is within a V, the relay of the next charging branch is closed, and the parallel operation in the charging process of all the charging and discharging branches is completed in this way;

[0064] 2) when discharging, according to the battery parameters of each charging and discharging branch, first close the high-voltage branch to discharge the charging and discharging branch, when the voltage difference between the discharging and the next discharging branch is within b V, then close the relay of the next discharging branch, and so on to complete the parallel operation of the discharging process of all charging and discharging branches.

[0065] In this optional embodiment, further, the master module 101 is further used for:

[0066] After the charging and discharging operation of all charging and discharging branches 102, the expected voltage change of each charging and discharging branch 102 is determined, and the disconnection control parameter of the corresponding switch control module 103 of each charging and discharging branch 102 is determined according to the expected voltage change of each charging and discharging branch 102; the disconnection control parameter of the corresponding switch control module 103 of all charging and discharging branches 102 is controlled according to the disconnection control parameter of the corresponding switch control module 103 of all charging and discharging branches 102.

[0067] Optionally, the disconnection control parameter can include disconnection time point control parameter, disconnection time length control parameter, etc., that is, after the discharging and charging of each charging and discharging branch is completed, the switch control module (such as a relay) of each charging and discharging branch can be closed for a period of time according to the expected voltage change of the charging and discharging branch.

[0068] It can be seen that the charging and discharging control circuit for vehicles described in Figure 2 realizes intelligent charging and discharging management and disconnection management of each charging and discharging branch through the cooperative control process of the first master device and the second master device, effectively reduces the occurrence of parallel failure caused by excessive voltage difference between branches, and can ensure the balance of each branch voltage, thereby improving the service life of the battery in the charging and discharging control circuit for vehicles and the state adaptability of the battery under different working conditions, to improve the reliability and stability of the circuit.

[0069] In another optional embodiment, as shown in Figure 2, the control circuit further includes an electrical parameter monitoring module corresponding to each target charging module 104, wherein:

[0070] The control end of the switch control module 103 corresponding to each charging and discharging branch 102 is electrically connected to the controlled end of the electrical parameter monitoring module corresponding to the corresponding target charging module 104, and the control end of the electrical parameter monitoring module corresponding to each target charging module 104 is used for electrically connecting the controlled end of the target charging module 104;

[0071] The electric parameter monitoring module corresponding to each target charging module 104 is configured to monitor the charging and discharging parameter corresponding to the target charging module 104 during the process that the main control module 101 performs charging and discharging operation on all the charging and discharging branches 102 through all the target charging modules 104, and determine whether the charging and discharging parameter is greater than or equal to a preset charging and discharging parameter threshold value; if yes, the target charging module 104 is controlled to be disconnected.

[0072] In the optional embodiment, further, the electric parameter monitoring module corresponding to each target charging module 104 comprises a fuse corresponding to the target charging module 104 and an analog Hall sensor, wherein for each target charging module 104:

[0073] The first end of the fuse corresponding to the target charging module 104 is electrically connected to the control end of the switch control module 103 corresponding to the charging and discharging branch 102 corresponding to the target charging module 104, the second end of the fuse corresponding to the target charging module 104 is electrically connected to the first end of the analog Hall sensor corresponding to the target charging module 104, and the second end of the analog Hall sensor corresponding to the target charging module 104 is configured to be electrically connected to the controlled end of the target charging module 104.

[0074] In the optional embodiment, the analog Hall sensor is arranged in each target charging module corresponding branch, which can meet the requirements of current collection and SOC integral accuracy of the vehicle charging and discharging system level, so as to achieve the effect that the fuse corresponding to the target charging module is quickly fused when a short circuit fault occurs. In addition, the analog Hall sensor arranged in the charging circuit can monitor the current of each charging circuit, which can reduce the uneven current distribution caused by inconsistent internal resistance and the circuit burning caused by uneven current distribution; the liquid-heat power supply circuit supplies power for the vehicle liquid-heat system; and the T-BOX module can be used for software upgrading, data remote monitoring, early warning and other operations.

[0075] It can be seen that the vehicle charging and discharging control circuit described in Figure 2 realizes real-time high-precision monitoring of the charging and discharging parameter by integrating the electric parameter monitoring module, including the fuse and the analog Hall sensor, on each target charging module. Once it is monitored that the charging and discharging parameter exceeds the preset safety threshold value, such as excessive current, the fuse will quickly act to automatically cut off the related branch, effectively preventing the fire or equipment damage caused by the short circuit fault, and significantly enhancing the safety protection capability of the circuit. In addition, the accurate measurement of the current of each charging and discharging circuit is ensured, the problem of uneven current distribution caused by inconsistent internal resistance is effectively solved, the circuit overheating or burning phenomenon caused by uneven current distribution is reduced, the service life of the vehicle voltage box is prolonged, and the reliability and stability of the vehicle voltage box are improved.

[0076] Embodiment two

[0077] Please refer to Fig. 3, which is a structural schematic diagram of a vehicle voltage box disclosed by the embodiment of the present application. The vehicle voltage box comprises any one of the vehicle charge-discharge control circuits in the embodiment one, and can be applied to a pure electric vehicle, a plug-in hybrid electric vehicle, a commercial vehicle, a heavy vehicle, etc. The embodiment of the present application is not limited. It should be noted that the detailed description of the vehicle charge-discharge control circuit is described in the embodiment one, and the detailed description of the related content is not repeated here.

[0078] It can be seen that the vehicle voltage box described in Fig. 3 can improve the battery monitoring reliability and accuracy of the vehicle voltage box itself through the master control module and the switch control module corresponding to each charge-discharge branch, and can further improve the charge-discharge control reliability and accuracy of the vehicle voltage box, so that the vehicle can limp to the repair station at low power when a fault occurs, thereby improving the vehicle repair efficiency and reducing the personnel repair cost.

Claims

1. A vehicle charging and discharging control circuit, characterized in that, The control circuit comprises a master control module, a plurality of charge-discharge branches, and a switch control module corresponding to each of the charge-discharge branches. The voltage collection end of the master control module is electrically connected to the voltage ends of all the charge-discharge branches, and the control end of the master control module is electrically connected to the controlled ends of the switch control modules corresponding to all the charge-discharge branches. The master control module is configured to collect the battery parameters of each of the charge-discharge branches, determine the charge-discharge sequence parameters of each of the charge-discharge branches according to the battery parameters of all the charge-discharge branches, and sequentially control the switch control modules corresponding to each of the charge-discharge branches to be closed according to the charge-discharge sequence parameters of all the charge-discharge branches, so as to perform charge-discharge operations on all the charge-discharge branches through all the target charging modules.

2. The charge and discharge control circuit according to claim 1, wherein The master control module comprises a first master control device and a second master control device. The voltage collection end of the second master control device is electrically connected to the voltage ends of all the charge-discharge branches, the data transmission end of the second master control device is electrically connected to the data receiving end of the first master control device, and the control end of the first master control device is electrically connected to the controlled ends of the switch control modules corresponding to all the charge-discharge branches. The second master control device is configured to collect the battery parameters of each of the charge-discharge branches when charge operations are required to be performed on all the charge-discharge branches, determine the branch voltage parameters of each of the charge-discharge branches according to the battery parameters of all the charge-discharge branches, and transmit the branch voltage parameters of all the charge-discharge branches to the first master control device. The first master control device is configured to determine the charge sequence parameters of each of the charge-discharge branches according to the branch voltage parameters of all the charge-discharge branches, sequentially control the switch control modules corresponding to each of the charge-discharge branches to be closed according to the charge sequence parameters of all the charge-discharge branches, and perform charge operations on all the charge-discharge branches through all the target charging modules; the smaller the branch voltage parameter of the charge-discharge branch is, the earlier the charge sequence parameter of the charge-discharge branch is.

3. The charge and discharge control circuit according to claim 2, wherein The second master control device is further configured to collect the battery parameters of each of the charge-discharge branches when discharge operations are required to be performed on all the charge-discharge branches, determine the branch voltage parameters of each of the charge-discharge branches according to the battery parameters of all the charge-discharge branches, and transmit the branch voltage parameters of all the charge-discharge branches to the first master control device. The first master device is further configured to determine a discharging sequence parameter of each of the charging and discharging branches according to branch voltage parameters of all the charging and discharging branches, and sequentially control the switch control module corresponding to each of the charging and discharging branches to be closed according to the discharging sequence parameters of all the charging and discharging branches, so as to perform discharging operation on all the charging and discharging branches by all the target charging modules. The greater the branch voltage parameter of the charging and discharging branch is, the earlier the discharging sequence parameter of the charging and discharging branch is.

4. The charge and discharge control circuit according to claim 2, wherein The first master device is specifically configured to: determine a charging voltage value of a target charging branch currently in a charging state from all the charging and discharging branches according to charging sequence parameters of all the charging and discharging branches; determine a first voltage difference between the target charging branch and a next charging branch corresponding to the target charging branch according to the charging voltage value of the target charging branch and a branch voltage parameter of the next charging branch, and judge whether the first voltage difference is less than a preset first voltage difference threshold value; when it is judged that the first voltage difference is less than the first voltage difference threshold value, control the switch control module corresponding to the next charging branch to be closed, so as to perform charging operation on the next charging branch by a target charging module corresponding to the next charging branch; update the next charging branch to the target charging branch, and repeatedly perform the step of determining a charging voltage value of a target charging branch currently in a charging state from all the charging and discharging branches according to charging sequence parameters of all the charging and discharging branches; determine a first voltage difference between the target charging branch and a next charging branch corresponding to the target charging branch according to the charging voltage value of the target charging branch and a branch voltage parameter of the next charging branch, and judge whether the first voltage difference is less than a preset first voltage difference threshold value; when it is judged that the first voltage difference is less than the first voltage difference threshold value, control the switch control module corresponding to the next charging branch to be closed, so as to perform charging operation on the next charging branch by a target charging module corresponding to the next charging branch; and update the next charging branch to the target charging branch, so as to perform charging operation on all the charging and discharging branches by all the target charging modules.

5. The charge and discharge control circuit according to claim 3, wherein The first master device is specifically configured to: determine a discharging voltage value of a target discharging branch currently in a discharging state from all the charging and discharging branches according to discharging sequence parameters of all the charging and discharging branches; determine a second voltage difference between the target discharging branch and a next discharging branch corresponding to the target discharging branch according to the discharging voltage value of the target discharging branch and a branch voltage parameter of the next discharging branch, and judge whether the second voltage difference is less than a preset second voltage difference threshold value; when it is judged that the second voltage difference is less than the second voltage difference threshold value, control the switch control module corresponding to the next discharging branch to be closed, so as to perform discharging operation on the next discharging branch by a target discharging module corresponding to the next discharging branch; and update the next discharging branch to the target discharging branch, so as to perform discharging operation on all the charging and discharging branches by all the target discharging modules. When it is judged that the second voltage difference value is less than the second voltage difference value threshold, the switch control module corresponding to the next discharge branch is controlled to be closed, so that the next discharge branch is discharged by the target charging module corresponding to the next discharge branch. The next discharge branch is updated as the target discharge branch, and the above steps are repeated to determine the discharge voltage value of the target discharge branch from all the charging and discharging branches according to the discharge sequence parameter of each charging and discharging branch, to determine the second voltage difference value between the target discharge branch and the next discharge branch corresponding to the target discharge branch according to the discharge voltage value of the target discharge branch and the branch voltage parameter of the next discharge branch, and to judge whether the second voltage difference value is less than the second voltage difference value threshold. When it is judged that the second voltage difference value is less than the second voltage difference value threshold, the switch control module corresponding to the next discharge branch is controlled to be closed, so that the next discharge branch is discharged by the target charging module corresponding to the next discharge branch.

6. The charge and discharge control circuit according to claim 1, wherein The main control module is further configured to: After the charging and discharging operation of all the charging and discharging branches is completed, the expected voltage change of each charging and discharging branch is determined, and the opening control parameter of the switch control module corresponding to each charging and discharging branch is determined according to the expected voltage change of each charging and discharging branch; and the opening control of the switch control module corresponding to all the charging and discharging branches is controlled according to the opening control parameter of the switch control module corresponding to all the charging and discharging branches.

7. The charge and discharge control circuit according to claim 1, wherein The control circuit further comprises an electric parameter monitoring module corresponding to each target charging module. The control end of the switch control module corresponding to each charging and discharging branch is electrically connected to the controlled end of the electric parameter monitoring module corresponding to the target charging module corresponding to the switch control module, and the control end of the electric parameter monitoring module corresponding to each target charging module is electrically connected to the controlled end of the target charging module. The electric parameter monitoring module corresponding to each target charging module is configured to monitor the charging and discharging parameter corresponding to the target charging module during the charging and discharging operation of all the charging and discharging branches by all the target charging modules, and to judge whether the charging and discharging parameter is greater than or equal to a preset charging and discharging parameter threshold; if yes, the target charging module is controlled to be opened.

8. The charge and discharge control circuit according to claim 7, wherein The electric parameter monitoring module corresponding to each target charging module comprises a fuse and an analog Hall sensor corresponding to the target charging module, and for each target charging module: The electric parameter monitoring module corresponding to each target charging module comprises a fuse and an analog Hall sensor corresponding to the target charging module, and for each target charging module: A first end of the fuse corresponding to the target charging module is electrically connected to a control end of a switch control module corresponding to the charging and discharging branch, a second end of the fuse corresponding to the target charging module is electrically connected to a first end of an analog Hall sensor corresponding to the target charging module, and a second end of the analog Hall sensor corresponding to the target charging module is used to electrically connect a controlled end of the target charging module.

9. The charge and discharge control circuit according to claim 8, wherein The switch control module corresponding to each charging and discharging branch includes a relay corresponding to the charging and discharging branch, and the battery parameters include at least one of a battery voltage parameter, a battery temperature parameter, a battery current parameter, and a battery health state parameter.

10. A voltage box for a vehicle, characterized by The vehicle voltage box includes the vehicle charging and discharging control circuit according to any one of claims 1-9.

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