Pre-charging device, control method and device thereof, storage medium and processor

Abstract

The application provides a pre-charging device, a control method and device thereof, a storage medium and a processor. The pre-charging device comprises a high-voltage input end and a main relay, the main relay is electrically connected with the high-voltage input end and a pre-charging capacitor, and the pre-charging device further comprises: a pre-pre-charging circuit which is connected in parallel with the main relay, the pre-pre-charging circuit comprises at least one parallel branch, any one of the parallel branches comprises at least one pre-charging relay and at least one pre-charging resistor; a detection module which is electrically connected with the pre-charging capacitor; and a control module which is in communication connection with the detection module, and is respectively electrically connected with a plurality of pre-charging relays and the main relay, and is used for controlling the on-off of the plurality of pre-charging relays according to the capacitance. In the case that the capacitance of the pre-charging capacitor is greater than or equal to a predetermined capacitance, the main relay and all the pre-charging relays are disconnected, so that the high-voltage input end cannot pre-charge the pre-charging capacitor, thereby eliminating the safety hazards in the pre-charging process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a pre-charging device, a control method and device thereof, a storage medium, a processor and an electric vehicle. BACKGROUND

[0002] In a pure electric vehicle, a plurality of large-capacity capacitors are generally arranged in parallel at a high-voltage input end of an installed motor controller, and the large-capacity capacitors are used for filtering and stabilizing the input voltage. When the installed motor controller starts a high-voltage power-on operation, in order to reduce the large current impact and prevent the impact current from damaging the high-voltage contactor and the fuse, a pre-charging circuit must be configured in the high-voltage output circuit of the pure electric vehicle chassis.

[0003] The pre-charging circuit in the prior art generally consists of a pre-charging relay and a pre-charging resistor, wherein the pre-charging resistor has a single resistance value and power, the entire pre-charging process lacks safety protection and pre-charging time controllability, when the vehicle installed system accesses a motor controller with different pre-charging capacitor capacity, there are problems of burning the pre-charging resistor and long pre-charging time, causing safety hazards and poor customer experience of the electric vehicle.

[0004] The above information disclosed in the background section is only used to enhance the understanding of the background of the technology described herein, therefore, the background section can include certain information which does not form the prior art known in the country to those skilled in the art. SUMMARY

[0005] The main purpose of the present application is to provide a pre-charging device, a control method and device thereof, a storage medium, a processor and an electric vehicle, to solve the problem of safety hazards in the pre-charging process in the prior art.

[0006] According to an aspect of an embodiment of the present application, a pre-charging device is provided, the pre-charging device comprising a high-voltage input end and a main relay, the main relay being electrically connected with the high-voltage input end and a pre-charging capacitor respectively, the pre-charging device further comprising: a pre-pre-charging circuit, connected in parallel with the main relay, for providing a pre-charging resistor for a pre-charging process of the pre-charging capacitor, the pre-pre-charging circuit comprising at least one branch connected in parallel, any one of the branches comprising at least one pre-charging relay and at least one pre-charging resistor; a detection module, electrically connected with the pre-charging capacitor, for detecting a capacitance of the pre-charging capacitor; and a control module, in communication connection with the detection module, the control module being electrically connected with a plurality of the pre-charging relays and the main relay respectively, for controlling on-off of the plurality of the pre-charging relays according to the capacitance.

[0007] Optionally, the branch comprises a first branch, and the first branch comprises a first pre-charging resistor, a second pre-charging relay and a second pre-charging resistor connected in series.

[0008] Optionally, the branch further comprises a second branch, the second branch comprising a first pre-charge relay, a third pre-charge relay and a third pre-charge resistor connected in series, a line between the first pre-charge resistor and the second pre-charge relay being a first line, a line between the first pre-charge relay and the third pre-charge relay being a second line, the first line being electrically connected with the second line.

[0009] Optionally, the pre-charge device further comprises a communication module, which is communicatively connected with the control module and configured to send an alarm information when the capacitance is greater than or equal to the predetermined capacitance threshold.

[0010] According to another aspect of the embodiments of the present application, a control method of a pre-charge device is further provided, the control method comprising: obtaining a capacitance of a pre-charge capacitor; determining a charging strategy when the capacitance is less than a predetermined capacitance; and controlling charging of the pre-charge capacitor according to the charging strategy until the charging is completed.

[0011] Optionally, the pre-charge device comprises a high-voltage input end and a main relay, the main relay being electrically connected with the high-voltage input end and the pre-charge capacitor respectively, the pre-charge device further comprising a pre-pre-charge circuit, the pre-pre-charge circuit being connected in parallel with the main relay, the pre-pre-charge circuit comprising at least one branch, any one of the branches comprising at least one pre-charge relay and at least one pre-charge resistor, the control method further comprising: controlling the main relay to be disconnected and controlling all the pre-charge relays to be disconnected when the capacitance is greater than or equal to the predetermined capacitance.

[0012] Optionally, the branches are at least two, and the determining of the charging strategy when the capacitance is less than the predetermined capacitance comprises: calculating a resistance range corresponding to a charging resistance of the pre-charge capacitor; determining a series-parallel connection mode of the pre-charge resistor according to the resistance range; and determining the charging strategy according to the series-parallel connection mode.

[0013] Optionally, the determining of the series-parallel connection mode of the pre-charge resistor according to the resistance range comprises: calculating resistance values corresponding to all pre-prepared series-parallel connection modes of the pre-charge resistor; determining a minimum resistance value within the resistance range according to the resistance values; and determining the series-parallel connection mode of the pre-charge resistor as a series-parallel connection mode corresponding to the minimum resistance value.

[0014] Optionally, the controlling of the charging of the pre-charge capacitor according to the charging strategy comprises: controlling the main relay to be disconnected; controlling on-off of each pre-charge relay according to the series-parallel connection mode; and controlling the high-voltage input end to charge the pre-charge capacitor.

[0015] Optionally, after the charging is completed, the control method further comprises: controlling the main relay to be turned on.

[0016] Optionally, the control method further comprises: in the case that the electric capacity is greater than or equal to the predetermined electric capacity, sending an alarm information.

[0017] According to still another aspect of the embodiments of the present application, a control device of a pre-charging device is provided, comprising: an acquisition unit configured to acquire an electric capacity of a pre-charging capacitor; a determination unit configured to determine a charging strategy in the case that the electric capacity is less than a predetermined electric capacity; and a first control unit configured to control charging of the pre-charging capacitor according to the charging strategy until the charging is completed.

[0018] According to still another aspect of the embodiments of the present application, a storage medium is provided, comprising a stored program, wherein the program performs any one of the control methods.

[0019] According to still another aspect of the embodiments of the present application, a processor is provided, configured to run a program, wherein the program performs any one of the control methods when running.

[0020] According to still another aspect of the embodiments of the present application, an electric vehicle is provided, comprising a pre-charging device and a control device, wherein the pre-charging device is any one of the pre-charging devices, and the control device performs any one of the control methods.

[0021] In the pre-charging device, the pre-charging circuit comprises a plurality of parallel branches, any one of the branches comprises at least one pre-charging relay and at least one pre-charging resistor, the detection module detects the electric capacity of the pre-charging capacitor, and the control module controls the on-off of the plurality of pre-charging relays according to the electric capacity, so that in the case that the electric capacity of the pre-charging capacitor is greater than or equal to the predetermined electric capacity, the main relay and all the pre-charging relays are turned off, and the high-voltage input end cannot pre-charge the pre-charging capacitor, thereby avoiding that the electric capacity of the pre-charging capacitor is too large to cause pre-charging current overload, and eliminating the safety hazard in the pre-charging process, and solving the problem of safety hazard in the pre-charging process in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an explanation of the illustrative embodiments of the present application, and are not intended to limit the present application. In the drawings:

[0023] Figure 1 A schematic diagram of a pre-charging device according to an embodiment of the present application is shown;

[0024] Figure 2 a flow chart of a control method of a pre-charge device according to an embodiment of the present application is shown; and

[0025] Figure 3 a schematic diagram of a control device of a pre-charge device according to an embodiment of the present application is shown.

[0026] Among the above drawings, the following reference signs are included:

[0027] 10, high voltage input terminal; 20, main relay; 30, pre-charge capacitor; 40, pre-pre-charge circuit; 41, first pre-charge resistor; 42, second pre-charge relay; 43, second pre-charge resistor; 44, first pre-charge relay; 45, third pre-charge relay; 46, third pre-charge resistor; 50, detection module; 60, control module; 70, communication module. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as "on" another element, it can be directly on the other element, or there can be an intermediate element. Moreover, when an element is described as "connected to" another element, it can be "directly connected to" the other element, or "connected to" the other element through a third element.

[0032] As mentioned in the background, the pre-charge process in the prior art has a security risk. To solve the above problems, in a typical embodiment of the present application, a pre-charge device, a control method and device thereof, a storage medium, a processor and an electric vehicle are provided.

[0033] According to an embodiment of the present application, a pre-charge device is provided.

[0034] Figure 1 is a schematic diagram of the pre-charge device according to an embodiment of the present application. As shown in Figure 1 The pre-charge device includes a high-voltage input end 10 and a main relay 20, the main relay 20 is electrically connected to the high-voltage input end 10 and a pre-charge capacitor 30, and the pre-charge device further includes:

[0035] A pre-pre-charge circuit 40 is connected in parallel with the main relay 20, and is used to provide a pre-charge resistor for the pre-charge process of the pre-charge capacitor 30. The pre-pre-charge circuit 40 includes at least one parallel branch, and any one of the branches includes at least one pre-charge relay and at least one pre-charge resistor.

[0036] A detection module 50 is electrically connected to the pre-charge capacitor 30, and is used to detect the capacitance of the pre-charge capacitor 30.

[0037] A control module 60 is communicatively connected to the detection module 50, and the control module 60 is electrically connected to a plurality of pre-charge relays and the main relay 20, respectively, and is used to control the on-off of the plurality of pre-charge relays according to the capacitance.

[0038] In the pre-charge device, the pre-pre-charge circuit includes a plurality of parallel branches, any one of the branches includes at least one pre-charge relay and at least one pre-charge resistor, the detection module detects the capacitance of the pre-charge capacitor, and the control module controls the on-off of the plurality of pre-charge relays according to the capacitance, so that in the case that the capacitance of the pre-charge capacitor is greater than or equal to a predetermined capacitance, the main relay and all the pre-charge relays are turned off, so that the high-voltage input end cannot pre-charge the pre-charge capacitor, avoiding the pre-charge current overload caused by the excessive capacitance of the pre-charge capacitor, thereby eliminating the security risk of the pre-charge process and solving the problem of the security risk of the pre-charge process in the prior art.

[0039] In an embodiment of the present application, as Figure 1As shown in the figure, the branch circuit includes a first branch circuit, and the first branch circuit includes a first pre-charge resistor 41, a second pre-charge relay 42 and a second pre-charge resistor 43 connected in series, and the second pre-charge relay 42 is electrically connected with the control module 60. Specifically, in the case that the capacitance of the pre-charge capacitor is greater than or equal to a predetermined capacitance, the second pre-charge relay is controlled to be disconnected by the control module, so that the first branch circuit is disconnected, and the high-voltage input end cannot pre-charge the pre-charge capacitor, thereby ensuring the safety of the circuit. Of course, in the case that the capacitance of the pre-charge capacitor is less than the predetermined capacitance, the second pre-charge relay is controlled to be connected by the control module, and the high-voltage input end charges the pre-charge capacitor through the first branch circuit, and the first pre-charge resistor and the second pre-charge resistor connected in series serve as a current-limiting resistor.

[0040] In an embodiment of the present application, as shown in the figure, Figure 1 The branch circuit further includes a second branch circuit, and the second branch circuit includes a first pre-charge relay 44, a third pre-charge relay 45 and a third pre-charge resistor 46 connected in series, the line between the first pre-charge resistor 41 and the second pre-charge relay 42 is a first line, the line between the first pre-charge relay 44 and the third pre-charge relay 45 is a second line, the first line is electrically connected with the second line, and the first pre-charge relay 44 and the third pre-charge relay 45 are respectively electrically connected with the control module 60. Specifically, in the case that the capacitance of the pre-charge capacitor is greater than or equal to a predetermined capacitance, the first pre-charge relay, the second pre-charge relay and the third pre-charge relay are controlled to be disconnected by the control module, so that the first branch circuit and the second branch circuit are disconnected, and the high-voltage input end cannot pre-charge the pre-charge capacitor, thereby ensuring the safety of the circuit.

[0041] It should be noted that, in the case that the capacitance of the pre-charge capacitor is less than the predetermined capacitance, the first pre-charge relay, the second pre-charge relay and the third pre-charge relay are controlled to be connected or disconnected by the control module, so as to adjust the series-parallel connection mode of the first pre-charge resistor, the second pre-charge resistor and the third pre-charge resistor, thereby adjusting the resistance of the pre-charge circuit, reducing the resistance of the pre-charge circuit under the premise of avoiding pre-charge current overload, and further reducing the charging time, improving the timeliness of the pre-charge device, and improving the user experience.

[0042] In an embodiment of the present application, as shown in the figure, Figure 1 The pre-charge device includes a communication module 70, which is in communication connection with the control module 60 and is used to send an alarm information in the case that the capacitance is greater than or equal to a predetermined capacitance threshold. Specifically, in the case that the capacitance is greater than or equal to a predetermined capacitance threshold, current overload is likely to occur, and the communication module sends an alarm information to remind the user of the safety hazard and replace the appropriate pre-charge resistor in time, thereby further improving the safety of the pre-charge process.

[0043] This application also provides a control method for a pre-charging device. It should be noted that the control method for the pre-charging device in this application can be used to control the pre-charging device provided in this application. The control method for the pre-charging device provided in this application is described below.

[0044] Figure 2 This is a flowchart of a control method for a pre-charging device according to an embodiment of this application. Figure 2 As shown, the above control method includes:

[0045] Step S101: Obtain the capacity of the pre-charged capacitor;

[0046] Step S102: If the above-mentioned capacity is less than the predetermined capacity, determine the charging strategy;

[0047] Step S103: Charge the pre-charge capacitor according to the above charging strategy until charging is complete.

[0048] In the above control method, the capacity of the pre-charge capacitor is obtained. If the capacity is less than the predetermined capacity, a charging strategy is determined, and the pre-charge capacitor is charged according to the charging strategy until charging is complete. This method only charges the pre-charge capacitor according to the charging strategy when the capacity is less than the predetermined capacity. That is, if the capacity is greater than or equal to the predetermined capacity, the pre-charge capacitor is not charged. This avoids overloading the pre-charge current due to an excessively large pre-charge capacitor capacity, thereby eliminating safety hazards during the pre-charging process. Furthermore, by determining the charging strategy, charging time is reduced, improving the efficiency of the pre-charging device and enhancing the user experience.

[0049] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0050] In an embodiment of the present application, the pre-charging device includes a high-voltage input end and a main relay, the main relay is electrically connected with the high-voltage input end and the pre-charging capacitor, the pre-charging device further includes a pre-pre-charging circuit, the pre-pre-charging circuit is connected in parallel with the main relay, the pre-pre-charging circuit includes at least one branch, any one of the branches includes at least one pre-charging relay and at least one pre-charging resistor, and the control method further includes: in the case that the capacitance is greater than or equal to the predetermined capacitance, controlling the main relay to be disconnected and controlling all the pre-charging relays to be disconnected. Specifically, the main relay is controlled to be disconnected and all the pre-charging relays are controlled to be disconnected, i.e., all the branches are disconnected, so that the high-voltage input end cannot pre-charge the pre-charging capacitor, and the problem that the pre-charging current is overloaded due to the excessive capacitance of the pre-charging capacitor is avoided, and the safety of pre-charging is further ensured.

[0051] It should be noted that, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, the maximum value W0 of the pulse energy borne by the pre-charging resistor during the pre-charging process needs to be less than the maximum value W of the pulse energy that the pre-charging resistor can withstand, and the calculation formula of the resistor pulse energy is as follows: W(t)=(CU max e 2 ) / 2, wherein t is time, C is capacitance, U is the voltage of the capacitor when the charging is completed, and R is the charging resistor. Through calculation, the maximum value W of the pulse energy borne by the charging resistor during the capacitor charging process is approximately CU -2t / RC / 2, and thus the maximum value W0 of the pulse energy that the pre-charging resistor of the pre-pre-charging circuit can withstand and the voltage U of the pre-charging capacitor when the charging is completed are substituted into the formula W max ≈CU 2 / 2, and the predetermined capacitance can be calculated.

[0052] In an embodiment of the present application, the branch has at least two, and in the case that the capacitance is less than the predetermined capacitance, the charging strategy is determined, including: calculating the resistance range corresponding to the charging resistor of the pre-charging capacitor; determining the series-parallel connection mode of the pre-charging resistor according to the resistance range; and determining the charging strategy according to the series-parallel connection mode. Specifically, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, it is also necessary to ensure that the maximum value P max of the instantaneous power borne by the pre-charging resistor during the pre-charging process is less than the product of the predetermined resistance rated power and the overload coefficient, and the calculation formula of the resistor instantaneous power is as follows: P(t)=(U 2 e max ) / R, wherein t is time, C is capacitance, U is the voltage of the capacitor when the charging is completed, and R is the charging resistor. Through calculation, the maximum value P 2 of the instantaneous power borne by the charging resistor during the capacitor charging process is approximately U -2t / RC / R, and thus the maximum value P0 of the instantaneous power that the pre-charging resistor of the pre-pre-charging circuit can withstand and the voltage U of the pre-charging capacitor when the charging is completed are substituted into the formula P max ≈U 2Therefore, the product of the predetermined resistance rated power and the overload coefficient is taken as P max Substituting the above formula, the minimum resistance value of the charging resistance can be calculated, that is, the resistance value range corresponding to the charging resistance of the pre-charging capacitor is calculated, so that the series-parallel connection mode of the pre-charging resistor meeting the resistance value range is found according to the resistance value range, and then the charging strategy is determined.

[0053] It should be noted that the series-parallel connection mode of the pre-charging resistor in the same branch is unchanged, and the series-parallel connection mode of the pre-charging resistor in different branches changes with the on-off sending of the pre-charging relay, thereby causing the total resistance of the pre-charging circuit to change. Therefore, in the case of using the pre-pre-charging circuit as the pre-charging circuit to pre-charge the pre-charging capacitor, the change of the series-parallel connection mode of the pre-charging resistor will cause the charging resistance of the pre-charging capacitor to change.

[0054] In an embodiment of the present application, the series-parallel connection mode of the pre-charging resistor is determined according to the above resistance value range, comprising: calculating the resistance values corresponding to all pre-pre-series-parallel connection modes, wherein the pre-pre-series-parallel connection mode is any series-parallel connection mode of the pre-charging resistor; determining the minimum resistance value in the above resistance value range according to a plurality of the above resistance values; and determining the series-parallel connection mode of the pre-charging resistor as the series-parallel connection mode corresponding to the minimum resistance value. Specifically, the calculation formula of the capacitor charging time is t = RCln[U / (U-U t )]. t t The charging time t is approximately 3RC when U t = 0.95U is considered as the completion of capacitor charging, and the charging time t is approximately 3RC. That is, in the case of determining the capacitance of the predetermined capacitor, the smaller the resistance value of the charging resistor R, the smaller the charging time t. Therefore, the resistance value corresponding to the pre-pre-series-parallel connection mode is determined as the minimum resistance value in the resistance value range, and the series-parallel connection mode corresponding to the minimum resistance value is used, so that the charging is the shortest under the premise of ensuring the safety of the charging, the timeliness of the pre-charging device is improved, and the user experience is improved.

[0055] In an embodiment of the present application, the pre-charging capacitor is charged according to the above charging strategy, comprising: controlling the main relay to be disconnected; controlling the on-off of each pre-charging relay according to the series-parallel connection mode; and controlling the high-voltage input end to charge the pre-charging capacitor. Specifically, the on-off of each pre-charging relay is controlled according to the series-parallel connection mode, so that each predetermined resistor forms a pre-charging circuit in the optimal series-parallel connection mode, to ensure the safety and timeliness of the pre-charging and improve the user experience. For example, as shown in the figure, the series-parallel connection mode is determined as the series connection of the first pre-charging resistor 41 and the third pre-charging resistor 46, so that the first pre-charging relay 44 is controlled to be disconnected, the second pre-charging relay 42 is controlled to be disconnected, and the third pre-charging relay 45 is controlled to be connected. Figure 1

[0056] In an embodiment of the present application, after the charging is completed, the control method further comprises: controlling the main relay to be turned on. Specifically, after the charging is completed, the pre-charge capacitor can filter and stabilize the input voltage of the high-voltage input terminal, and the main relay is turned on to be powered by high voltage, which can avoid damage to the high-voltage contactor and the fuse of the upper motor controller caused by the impact current.

[0057] In an embodiment of the present application, the control method further comprises: in the case that the capacitance is greater than or equal to the predetermined capacitance, sending an alarm information. Specifically, since in the case that the capacitance is greater than or equal to the predetermined capacitance threshold, current overload is prone to occur, the alarm information is sent to remind the user of the safety hazard and replace the appropriate pre-charge resistor in time, thereby further improving the safety of the pre-charge process.

[0058] The embodiment of the present application further provides a control device of a pre-charge device. It should be noted that the control device of the pre-charge device of the embodiment of the present application can be used to execute the control method of the pre-charge device provided by the embodiment of the present application. The control device of the pre-charge device provided by the embodiment of the present application is introduced as follows.

[0059] Figure 3 FIG. 1 is a schematic diagram of a control device of a pre-charge device according to an embodiment of the present application. As shown in FIG. 1, the control device comprises: Figure 3

[0060] An acquisition unit 100 is configured to acquire a capacitance of a pre-charge capacitor.

[0061] A determination unit 200 is configured to determine a charging strategy in the case that the capacitance is less than a predetermined capacitance.

[0062] A first control unit 300 is configured to control charging of the pre-charge capacitor according to the charging strategy until the charging is completed.

[0063] In the control device, the acquisition unit acquires the capacitance of the pre-charge capacitor, the determination unit determines the charging strategy in the case that the capacitance is less than the predetermined capacitance, and the control unit controls the charging of the pre-charge capacitor according to the charging strategy until the charging is completed. The control device controls the charging of the pre-charge capacitor according to the charging strategy only in the case that the capacitance is less than the predetermined capacitance, that is, in the case that the capacitance is greater than or equal to the predetermined capacitance, the pre-charge capacitor is not charged, which avoids the overloading of the pre-charge current caused by the excessive capacitance of the pre-charge capacitor, thereby eliminating the safety hazard in the pre-charge process. In addition, by determining the charging strategy, the charging time is reduced, the timeliness of the pre-charge device is improved, and the use experience is improved.

[0064] ​In one embodiment of this application, the control device further includes a second control unit, which is used to control the main relay to disconnect and control all pre-charge relays to disconnect when the capacitance is greater than or equal to the predetermined capacitance. Specifically, controlling the main relay to disconnect and controlling all pre-charge relays to disconnect means disconnecting all branches, preventing the high-voltage input terminal from pre-charging the pre-charge capacitor, avoiding excessive capacitance of the pre-charge capacitor leading to pre-charge current overload, and further ensuring the safety of pre-charging.

[0065] It should be noted that, in order to prevent the pre-charging resistor from burning out during the pre-charging process, the maximum pulse energy W that the pre-charging resistor withstands during the pre-charging process must be [limited / limited]. max The required energy must be less than the maximum value W0 of the pre-charge resistor withstand pulse. The formula for calculating the resistor pulse energy is as follows: W(t) = (CU) 2 e -2t / RC ) / 2, where t is time, C is capacitance, U is the voltage at which the capacitor is fully charged, and R is the charging resistance. By calculation, the maximum pulse energy W that the charging resistor withstands during the capacitor charging process is... max ≈CU 2 / 2, therefore, substituting the maximum value W0 of the pre-charge resistor withstand pulse energy of the pre-charge circuit and the voltage U when the pre-charge capacitor is fully charged into the above formula W max ≈CU 2 The predetermined electrical capacity can be calculated by dividing by 2.

[0066] In one embodiment of this application, the determining unit includes a calculation module, a first determining module, and a second determining module. The calculation module calculates the resistance range corresponding to the charging resistor of the pre-charge capacitor. The first determining module determines the series-parallel connection method of the pre-charge resistor based on the resistance range. The second determining module determines the charging strategy based on the series-parallel connection method. Specifically, to prevent the pre-charge resistor from burning out during pre-charging, it is also necessary to ensure that the maximum instantaneous power P borne by the pre-charge resistor during pre-charging is maintained. max When the instantaneous power of a resistor is less than the product of its rated power and overload factor, the formula for calculating the instantaneous power of the resistor is as follows: P(t) = (U 2 e -2t / RC ) / R, where t is time, C is capacitance, U is the voltage at which the capacitor is fully charged, and R is the charging resistance. By calculation, the maximum instantaneous power P that the charging resistor withstands during the capacitor charging process is... max ≈U 2 / R, therefore, the product of the rated power of the predetermined resistor and the overload factor is taken as P. maxSubstituting into the above formula, the minimum resistance value of the charging resistor can be calculated, that is, the resistance range corresponding to the charging resistor of the pre-charge capacitor can be calculated. Based on the resistance range, the series and parallel connection methods of the pre-charge resistors that meet the resistance range can be found, and then the charging strategy can be determined.

[0067] In one embodiment of this application, the first determining module includes a calculation submodule, a first determining submodule, and a second determining submodule. The calculation submodule is used to calculate the resistance values ​​corresponding to all pre-conducting series-parallel configurations, where the pre-conducting series-parallel configurations are any one of the pre-charge resistors. The first determining submodule is used to determine the minimum resistance value within the specified resistance value range based on the multiple resistance values. The second determining submodule is used to determine that the pre-charge resistor's series-parallel configuration is the one corresponding to the minimum resistance value. Specifically, the formula for calculating the capacitor charging time is t = RCln[U / (UU)]. t [), where C is the capacitance, U is the voltage at which the capacitor is fully charged, and U t U is the capacitor voltage at charging time t, R is the charging resistance, and U is the capacitor voltage at charging time t. t When the capacitance reaches 0.95U, the capacitor is considered fully charged. The charging time is approximately 3RC. This means that, given a fixed capacitance, the smaller the resistance of the charging resistor R, the shorter the charging time t. Therefore, the resistor value corresponding to the pre-connected series-parallel configuration is determined to be the minimum resistance value within the specified range. By using the series-parallel configuration corresponding to this minimum resistance value, the charging time can be minimized while ensuring charging safety, thus improving the efficiency of the pre-charging device and enhancing the user experience.

[0068] In one embodiment of this application, the first control unit includes a first control module, a second control module, and a third control module. The first control module controls the main relay to disconnect; the second control module controls the on / off state of each of the pre-charge relays according to the series-parallel connection method; and the third control module controls the charging of the pre-charge capacitor by the high-voltage input terminal. Specifically, controlling the on / off state of each of the pre-charge relays according to the series-parallel connection method ensures that each predetermined resistor forms a pre-charge circuit according to an optimal series-parallel connection method, thereby guaranteeing the safety and timeliness of pre-charging and improving user experience. For example, as... Figure 1 As shown, the series-parallel connection method is determined by the first pre-charge resistor 41 and the third pre-charge resistor 46 being connected in series. Then, the first pre-charge relay 44 is controlled to open, the second pre-charge relay 42 is controlled to open, and the third pre-charge relay 45 is controlled to close.

[0069] In an embodiment of the present application, the control device further comprises a third control unit, which is configured to control the main relay to be turned on after the charging is completed. Specifically, after the charging is completed, the pre-charge capacitor can filter and stabilize the input voltage of the high-voltage input terminal, and the main relay is turned on to be powered by the high voltage, so that the high-voltage contactor and the fuse of the upper motor controller can be prevented from being damaged by the impact current.

[0070] In an embodiment of the present application, the control method further comprises: in the case that the capacitance is greater than or equal to the predetermined capacitance, sending an alarm information. Specifically, in the case that the capacitance is greater than or equal to the predetermined capacitance threshold, the current overload is prone to occur, the alarm information is sent to remind the user of the safety hazard, and the appropriate pre-charge resistor is replaced in time, so that the safety of the pre-charge process is further improved.

[0071] The present application further provides an electric vehicle comprising the pre-charge device and the control device, wherein the pre-charge device is any of the pre-charge devices described above, and the control device executes any of the control methods described above.

[0072] In the electric vehicle, the detection module acquires the capacitance of the pre-charge capacitor, the control module determines the charging strategy in the case that the capacitance is less than the predetermined capacitance, and the control module controls the pre-charge capacitor to be charged according to the charging strategy until the charging is completed. In the electric vehicle, the pre-charge capacitor is controlled to be charged according to the charging strategy only in the case that the capacitance is less than the predetermined capacitance, i.e., the pre-charge capacitor is not charged in the case that the capacitance is greater than or equal to the predetermined capacitance, so that the pre-charge current overload caused by the excessive capacitance of the pre-charge capacitor is avoided, the safety hazard of the pre-charge process is eliminated, and the charging time is reduced by determining the charging strategy, the timeliness of the pre-charge device is improved, and the use experience is improved.

[0073] The control device of the pre-charge device comprises a processor and a memory, and the acquisition unit, the determination unit, the first control unit, etc. are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory.

[0074] The processor comprises a core, and the core retrieves the corresponding program units from the memory. The core can be set to one or more, and the problem of safety hazard in the pre-charge process in the prior art can be solved by adjusting the core parameters.

[0075] The memory can include a non-persistent memory in a computer readable medium, a random access memory (RAM), and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0076] The embodiment of the present application provides a storage medium, which stores a program, and the program is executed by a processor to realize the control method of the pre-charging device.

[0077] The embodiment of the present application provides a processor, which is used for running a program, and the program is executed to realize the control method of the pre-charging device.

[0078] The embodiment of the present application provides a device, which comprises a processor, a memory and a program stored in the memory and capable of being run on the processor, and the processor realizes at least the following steps when executing the program.

[0079] In step S101, the capacitance of the pre-charging capacitor is acquired.

[0080] In step S102, the charging strategy is determined when the capacitance is less than a predetermined capacitance.

[0081] In step S103, the pre-charging capacitor is charged according to the charging strategy until the charging is completed.

[0082] The device in the present application can be a server, a PC, a PAD, a mobile phone or the like.

[0083] The present application further provides a computer program product, which is suitable for executing the program with at least the following method steps when executed on a data processing device.

[0084] In step S101, the capacitance of the pre-charging capacitor is acquired.

[0085] In step S102, the charging strategy is determined when the capacitance is less than a predetermined capacitance.

[0086] In step S103, the pre-charging capacitor is charged according to the charging strategy until the charging is completed.

[0087] In the above embodiments of the present application, the description of each embodiment has its own focus, and the part not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0088] In the several embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the unit division in the above device embodiment is only a logical function division, and there can be another division manner during actual implementation; for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, units or modules, and can be electrical or other forms.

[0089] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0090] In addition, each functional unit in each embodiment of the application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0091] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the above-mentioned method of each embodiment of the application. The foregoing storage medium includes: a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0092] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects:

[0093] 1) In the pre-charging device of the application, the pre-charging circuit includes a plurality of parallel branches, any branch includes at least one pre-charging relay and at least one pre-charging resistor, the detection module detects the capacitance of the pre-charging capacitor, and the control module controls the on-off of the plurality of pre-charging relays according to the capacitance, so that in the case that the capacitance of the pre-charging capacitor is greater than or equal to the predetermined capacitance, the main relay and all pre-charging relays are disconnected, so that the high-voltage input end cannot pre-charge the pre-charging capacitor, avoiding the problem that the pre-charging current is overloaded due to the too large capacitance of the pre-charging capacitor, thereby eliminating the safety hazard in the pre-charging process and solving the problem of safety hazard in the pre-charging process in the prior art.

[0094] 2) In the control method of this application, the capacity of the pre-charge capacitor is obtained. If the capacity is less than the predetermined capacity, a charging strategy is determined, and the pre-charge capacitor is charged according to the charging strategy until charging is complete. This method only charges the pre-charge capacitor according to the charging strategy when the capacity is less than the predetermined capacity. That is, if the capacity is greater than or equal to the predetermined capacity, the pre-charge capacitor is not charged. This avoids overloading the pre-charge current due to an excessively large pre-charge capacitor capacity, thereby eliminating safety hazards during the pre-charging process. Furthermore, by determining the charging strategy, charging time is reduced, improving the timeliness of the pre-charging device and enhancing the user experience.

[0095] 3) In the control device of this application, the acquisition unit acquires the capacity of the pre-charged capacitor, the determination unit determines a charging strategy when the capacity is less than a predetermined capacity, and the control unit controls the charging of the pre-charged capacitor according to the charging strategy until charging is complete. The above-mentioned control device only controls the charging of the pre-charged capacitor according to the charging strategy when the capacity is less than the predetermined capacity. That is, when the capacity is greater than or equal to the predetermined capacity, the pre-charged capacitor is not charged. This avoids overloading of the pre-charge current due to excessively large pre-charged capacitor capacity, thereby eliminating safety hazards in the pre-charging process. Furthermore, by determining the charging strategy, charging time is reduced, the timeliness of the pre-charging device is improved, and the user experience is enhanced.

[0096] 4) In the electric vehicle of this application, the detection module obtains the capacity of the pre-charging capacitor. When the capacity is less than the predetermined capacity, the control module determines a charging strategy and controls the pre-charging capacitor to be charged according to the charging strategy until charging is complete. The aforementioned electric vehicle only charges the pre-charging capacitor according to the charging strategy when the capacity is less than the predetermined capacity. That is, when the capacity is greater than or equal to the predetermined capacity, the pre-charging capacitor is not charged. This avoids overloading the pre-charging current due to excessively large pre-charging capacitor capacity, thereby eliminating safety hazards during the pre-charging process. Furthermore, by determining the charging strategy, charging time is reduced, the efficiency of the pre-charging device is improved, and the user experience is enhanced.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pre-charging device, characterized in that, The pre-charging device comprises a high-voltage input end and a main relay, the main relay is electrically connected with the high-voltage input end and a pre-charging capacitor respectively, and the pre-charging device further comprises: a pre-pre-charging circuit which is connected in parallel with the main relay and is used for providing a pre-charging resistor for a pre-charging process of the pre-charging capacitor, the pre-pre-charging circuit comprises at least one branch, and any one of the branches comprises at least one pre-charging relay and at least one pre-charging resistor; a detection module which is electrically connected with the pre-charging capacitor and is used for detecting a capacitance of the pre-charging capacitor; a control module which is communicatively connected with the detection module, the control module is electrically connected with a plurality of pre-charging relays and the main relay respectively, and the control module is used for controlling the main relay to be disconnected and controlling the plurality of pre-charging relays to be disconnected in a case where the capacitance is greater than a predetermined capacitance; the branch comprises a first branch, and the first branch comprises a first pre-charging resistor, a second pre-charging relay and a second pre-charging resistor which are connected in series; the branch further comprises a second branch, the second branch comprises a first pre-charging relay, a third pre-charging relay and a third pre-charging resistor which are connected in series, a line between the first pre-charging resistor and the second pre-charging relay is a first line, a line between the first pre-charging relay and the third pre-charging relay is a second line, and the first line is electrically connected with the second line; the control module is further used for controlling the first pre-charging relay, the second pre-charging relay and the third pre-charging relay to be turned on or turned off in a case where the capacitance is less than the predetermined capacitance, so as to adjust a series-parallel connection mode of the first pre-charging resistor, the second pre-charging resistor and the third pre-charging resistor.

2. The pre-charging device of claim 1, wherein The pre-charging device comprises: a communication module which is communicatively connected with the control module and is used for sending an alarm information in a case where the capacitance is greater than or equal to a predetermined capacitance threshold.

3. A control method of the precharging device according to claim 1 or 2, characterized by, The control method comprises: obtaining a capacitance of a pre-charging capacitor; determining a charging strategy in a case where the capacitance is less than a predetermined capacitance; controlling charging of the pre-charging capacitor according to the charging strategy until the charging is completed; the control method further comprises: controlling the main relay to be disconnected and controlling all the pre-charging relays to be disconnected in a case where the capacitance is greater than or equal to the predetermined capacitance; the branch comprises a first branch, and the first branch comprises a first pre-charging resistor, a second pre-charging relay and a second pre-charging resistor which are connected in series, the branch further comprises a second branch, the second branch comprises a first pre-charging relay, a third pre-charging relay and a third pre-charging resistor which are connected in series, a line between the first pre-charging resistor and the second pre-charging relay is a first line, a line between the first pre-charging relay and the third pre-charging relay is a second line, the first line is electrically connected with the second line, and determining a charging strategy in a case where the capacitance is less than a predetermined capacitance comprises: calculating a resistance value range corresponding to a charging resistor of the pre-charging capacitor; determining a series-parallel connection mode of a pre-charging resistor according to the resistance value range; and determining the charging strategy according to the series-parallel connection mode. The control method further comprises, in the case that the capacitance is less than the predetermined capacitance, controlling the on-off of the first pre-charging relay, the second pre-charging relay and the third pre-charging relay to adjust the series-parallel connection mode of the first pre-charging resistor, the second pre-charging resistor and the third pre-charging resistor.

4. The control method according to claim 3, characterized by The series-parallel connection mode of the pre-charging resistor is determined according to the resistance value range, comprising: calculating resistance values corresponding to all the preliminary series-parallel connection modes of the pre-charging resistor; determining a minimum resistance value in the resistance value range according to a plurality of the resistance values; determining the series-parallel connection mode of the pre-charging resistor as the series-parallel connection mode corresponding to the minimum resistance value.

5. The control method according to claim 3, characterized by, controlling charging of the pre-charging capacitor according to the charging strategy, comprising: controlling the main relay to be off; controlling the on-off of each pre-charging relay according to the series-parallel connection mode; controlling the high-voltage input end to charge the pre-charging capacitor.

6. The control method according to claim 3, characterized by After the charging is completed, the control method further comprises: controlling the main relay to be on.

7. The control method according to claim 3, characterized by, The control method further comprises: in the case that the capacitance is greater than or equal to the predetermined capacitance, sending an alarm message.

8. A control device for the precharge device as claimed in claim 1 or 2, characterized by comprising: an acquisition unit configured to acquire a capacitance of a pre-charging capacitor; a determination unit configured to determine a charging strategy in the case that the capacitance is less than a predetermined capacitance; a first control unit configured to control charging of the pre-charging capacitor according to the charging strategy until the charging is completed; the control device further comprises a second control unit configured to control the main relay to be off and control all the pre-charging relays to be off in the case that the capacitance is greater than or equal to the predetermined capacitance; the branch comprises a first branch comprising a first pre-charging resistor, a second pre-charging relay and a second pre-charging resistor connected in series, and a second branch comprising a first pre-charging relay, a third pre-charging relay and a third pre-charging resistor connected in series, a line between the first pre-charging resistor and the second pre-charging relay being a first line, a line between the first pre-charging relay and the third pre-charging relay being a second line, the first line being electrically connected with the second line, the determination unit comprising a calculation module, a first determination module and a second determination module, wherein the calculation module is configured to calculate a resistance value range corresponding to a charging resistor of the pre-charging capacitor; the first determination module is configured to determine a series-parallel connection mode of a pre-charging resistor according to the resistance value range; and the second determination module is configured to determine the charging strategy according to the series-parallel connection mode. The control device is further configured to, in the case that the capacitance is less than the predetermined capacitance, control the on-off of the first pre-charging relay, the second pre-charging relay and the third pre-charging relay to adjust the series-parallel connection mode of the first pre-charging resistor, the second pre-charging resistor and the third pre-charging resistor.

9. A storage medium, characterized by The storage medium comprises a stored program, wherein the program executes the control method of any one of claims 3 to 7. The storage medium comprises a stored program, wherein the program executes the control method of any one of claims 3 to 7.

10. A processor, comprising: The processor is configured to run a program, wherein the program performs the control method according to any one of claims 3 to 7 when the program is run.

11. An electric vehicle comprising a pre-charge device and a control device, characterized in that The pre-charging device is the pre-charging device according to claim 1 or 2, and the control device performs the control method according to any one of claims 3 to 7.

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