A pre-charging control system for lithium battery assembly of industrial vehicles

Abstract

The present invention discloses a pre-charging control system for an industrial vehicle lithium battery assembly, the system comprising a drive motor controller, a power supply component; a drive motor contactor and a first pre-charging circuit connected between the power supply output end of the power supply component and the power supply input end of the drive motor controller; a first switch and a second switch that are synchronously disconnected and synchronously closed; when the first switch is closed, the power supply component outputs a power supply voltage; the second switch connects the power supply output end of the power supply component and a power pin on a logic card; the first pre-charging circuit is closed when the first pre-charging circuit charges the two contact ends of the drive motor contactor with the power supply voltage to a small voltage difference; when the power pin on the logic card is powered off, the drive motor contactor is disconnected. In the present application, a dual-way switch is used to achieve the effect of synchronously controlling whether the power supply voltage of the power supply component is output and whether the drive motor contactor is disconnected, thereby ensuring the power supply safety of the drive motor controller.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit devices, and in particular to a pre-charging control system for an industrial vehicle lithium battery assembly. Background Art

[0002] In industrial vehicles or other similar industrial equipment, the drive motor is one of the key components for the normal operation of the equipment. The start and stop of the drive motor is controlled by the drive motor controller; the drive motor controller is powered by a power supply. Generally, the power supply is connected to a key switch; when the key switch is closed, the power supply supplies power to the drive motor controller, and the drive motor controller starts to work normally; when the key switch is disconnected, the power supply to the drive motor is interrupted.

[0003] During the startup process of the power supply to the drive motor controller, there is often a large instantaneous current when the circuit between the power supply and the drive motor controller is connected. Excessive instantaneous current often causes irreversible damage to circuit components, thereby causing the drive motor controller to fail to work normally. Summary of the invention

[0004] The purpose of the present invention is to provide a pre-charging control system for an industrial vehicle lithium battery assembly, which can ensure the safety of the operation of a drive motor controller.

[0005] In order to solve the above technical problems, the present invention provides an industrial vehicle lithium battery assembly pre-charging control system, comprising a power supply component for supplying power to a drive motor controller; a drive motor contactor and a first pre-charging circuit connected between a power supply output end of the power supply component and a power supply input end of the drive motor controller;

[0006] Also included is a two-way switch, the two-way switch comprising a first switch and a second switch that are synchronously opened and synchronously closed;

[0007] The first switch is connected to the power supply component, and when the first switch is closed, the power supply output end of the power supply component outputs a power supply voltage;

[0008] A first end of the second switch is connected to a power supply output end of the power supply assembly, and a second end is connected to an electrical pin on a logic card of the drive motor controller;

[0009] The drive motor contactor is used to close when the first pre-charging circuit uses the power supply voltage to charge the two contact ends of the drive motor contactor to a voltage difference that is no greater than a first preset voltage difference, so that the power supply component can supply power to the drive motor controller; when the power pin on the logic card is powered off, the drive motor contactor is disconnected.

[0010] In an optional embodiment of the present application, the power supply component includes a power supply component, a second pre-charging circuit and a discharge contactor;

[0011] The first end of the discharge contactor is connected to the output end of the power supply assembly; the second end of the discharge contactor is connected to the power supply input end of the drive motor controller; the two wiring terminals of the second pre-charging circuit are respectively connected to the first end and the second end of the discharge contactor; the first switch is connected to the second pre-charging circuit;

[0012] When the first switch is closed, the second pre-charging circuit charges the first end and the second end of the discharge contactor; when the voltage difference between the first end and the second end of the discharge contactor is less than a second preset voltage difference, the discharge contactor is closed.

[0013] In an optional embodiment of the present application, the power supply assembly further includes the DC-DC converter and a BMS device;

[0014] The first end of the first switch is connected to the output end of the power supply component, and the second end is connected to the BMS device through the DC-DC converter; the first output end and the second output end of the BMS device are respectively connected to the second pre-charging circuit and the discharge contactor, and are used to control the pre-charging circuit to charge the first end and the second end of the discharge contactor when the first switch is closed; and when the voltage difference between the first end and the second end of the discharge contactor is less than the second preset voltage difference, control the discharge contactor to close.

[0015] In an optional embodiment of the present application, the second pre-charging circuit includes a pre-charging contactor and a pre-charging resistor; the switch input end of the pre-charging contactor is connected to the first end of the discharge contactor, the switch output end is connected to the first end of the pre-charging resistor, the inductor input end and the inductor output end are connected to the BMS device; the second end of the pre-charging resistor is connected to the second end of the discharge contactor.

[0016] In an optional embodiment of the present application, the power supply component is a lithium battery.

[0017] In an optional embodiment of the present application, the first pre-charging circuit includes a diode and a resistance element connected in series.

[0018] The present invention provides an industrial vehicle lithium battery assembly pre-charging control system, the system includes a drive motor controller, a power supply component for supplying power to the drive motor controller; a drive motor contactor and a first pre-charging circuit connected between the power supply output end of the power supply component and the power supply input end of the drive motor controller; and also includes a two-way switch, the two-way switch including a first switch and a second switch that are synchronously disconnected and synchronously closed; the first switch is connected to the power supply component, and when the first switch is closed, the power supply output end of the power supply component outputs a power supply voltage; the first end of the second switch is connected to the power supply output end of the power supply component, and the second end is connected to the power pin on the logic card of the drive motor controller; the drive motor contactor is used to close when the first pre-charging circuit uses the power supply voltage to charge the two contact ends of the drive motor contactor to a voltage difference not greater than a first preset voltage difference, so that the power supply component supplies power to the drive motor controller; when the power pin on the logic card is powered off, the drive motor contactor is disconnected.

[0019] In the present application, a dual-way switch is arranged in the power supply circuit of the drive motor controller, and a first switch and a second switch are synchronously opened and closed in the dual-way switch. When the first switch is opened to control the power supply component to interrupt the output of the power supply voltage, the second switch can also disconnect the closed loop formed between the logic card, the drive circuit contactor and the energy storage element inside the drive motor controller, so that once the power supply component interrupts the output of the power supply voltage, the energy storage element inside the drive motor controller cannot power on the logic card in the drive motor controller, so that the drive motor contactor is also disconnected accordingly; this is equivalent to achieving the effect of synchronous control of whether the power supply component outputs the power supply voltage and whether the drive motor contactor is disconnected to a certain extent, thereby avoiding the energy impact on the internal circuit elements of the drive motor controller caused by the sudden disconnection and connection of the first switch that controls the output of the power supply voltage of the power supply component, thereby ensuring the power supply safety of the drive motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the circuit structure of an industrial vehicle lithium battery assembly pre-charging control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The drive motor controller in industrial vehicles and other equipment generally uses a key switch to control whether the drive motor controller and the power supply are directly connected.

[0023] Considering that the contactor connected between the drive motor controller and the power supply will generate a large instantaneous current when it is disconnected and connected, the instantaneous current can be as high as 2000A, which is easy to damage the contactor and even impact the internal circuit components of the drive motor controller. Therefore, a corresponding pre-charging circuit can be configured for the contactor. After the key switch is inserted, the pre-charging circuit will first charge the two ends of the contactor. The contactor can only be closed when the voltage difference between the two ends is small, thereby avoiding damage to the circuit components due to excessive current when the drive motor controller and the power supply are connected.

[0024] However, to determine whether the voltage difference across the contactor has reached the connection requirement, a logic card for determining the voltage difference across the contactor is also required, and the logic card and the pre-charging circuit are both powered by the power supply voltage. When the key switch is inserted, the logic card and the pre-charging circuit are simultaneously powered on by the power supply voltage. The pre-charging circuit charges the two ends of the contactor between the power supply and the drive motor controller. The logic card detects the voltage difference across the contactor in real time. Once it is determined that the voltage difference across the two ends is small, the contactor can be controlled to close; and when the key is pulled out and the key switch is turned off, the pre-charging circuit and the logic card are disconnected from the power supply. When the logic card is powered off, the contactor is also disconnected accordingly.

[0025] However, the drive motor controller generally contains energy storage elements such as capacitors. Generally, when the power supply is cut off to the logic card, the logic card will not be completely powered off in a short time due to the discharge effect of energy storage elements such as capacitors. In other words, the contactor connecting the power supply and the drive motor controller will not be disconnected in a short time. Only when the energy storage elements such as capacitors are completely powered off, the logic card can be completely powered off and the contactor can be disconnected.

[0026] Considering that in actual applications, due to various reasons such as driver's misoperation, the key is often pulled out of the key switch and then quickly inserted into the key switch; that is, the power supply is interrupted and then restored in a short time.

[0027] Based on the above discussion, it is obvious that the power of the energy storage element in the drive motor controller is not exhausted in the short time when the key is pulled out. The logic card also remains powered on, and the contactor will not be disconnected; at this time, when the key is inserted into the key switch again, because the contactor is not disconnected, it is obvious that the instantaneous high current will be directly connected to the inside of the drive motor controller. Obviously, this is very dangerous to the internal components of the drive motor controller and can easily cause component damage.

[0028] To this end, the present application proposes a technical solution that can prevent the impact of instantaneous high-intensity current on the internal circuit components of the drive motor controller during the repeated disconnection and connection of the key switch.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, Figure 1 A schematic diagram of the circuit structure of an industrial vehicle lithium battery assembly pre-charging control system provided in an embodiment of the present application. The industrial vehicle lithium battery assembly pre-charging control system may include:

[0031] A power supply component 2 is used to supply power to the drive motor controller 1.

[0032] The drive motor contactor KM1 and the first pre-charging circuit 3 are connected between the power supply output terminal of the power supply component 2 and the power supply input terminal of the drive motor controller 1 .

[0033] like Figure 1 As shown, because the first pre-charging circuit 3 needs to charge both ends of the driving motor contactor KM1 to reduce the voltage difference between the two ends, the driving motor contactor KM1 and the first pre-charging circuit 3 can be connected in parallel.

[0034] It also includes a dual-way switch 4, which includes a first switch K1 and a second switch K2 that are synchronously opened and closed;

[0035] It should be noted that the two-way switch 4 in this embodiment is equivalent to a key switch, that is, when the key is inserted, the first switch K1 and the second switch K2 in the two-way switch 4 are synchronously closed; when the key is pulled out, the first switch K1 and the second switch K2 are synchronously disconnected. Of course, in actual application, the present application is not limited to controlling its disconnection and connection by inserting and removing a physical key. For example, it can also be a knob switch, a button switch, etc. In short, the two-way switch 4 is a switch that is manually controlled to disconnect and connect, and it ultimately controls whether the power supply component 2 supplies power to the drive motor controller 1.

[0036] The first switch K1 is connected to the power supply component 2. When the first switch K1 is closed, the power supply output terminal of the power supply component 2 outputs a power supply voltage;

[0037] A first end of the second switch K2 is connected to the power supply output end of the power supply assembly 2 , and a second end of the second switch K2 is connected to an electrical pin on the logic card of the drive motor controller KM2 .

[0038] It can be seen that in actual application, the power pin IN on the logic card, the first pre-charging circuit 3 and the drive motor contactor KM1 are all connected to the same power supply output terminal of the power supply component 2.

[0039] The drive motor contactor KM1 is used to close when the first pre-charging circuit 3 charges the two contact terminals of the drive motor contactor KM1 with the supply voltage to a voltage difference not greater than a first preset voltage difference, so that the power supply component 2 supplies power to the drive motor controller 1 .

[0040] When the power pin IN of the logic card is powered off, the drive motor contactor KM1 is disconnected.

[0041] It should be noted that a conventional logic chip capable of performing logic judgment can be used for the logic card. The power supply pin corresponding to the logic card, that is, the logic card power-on pin IN, is directly connected to the power supply output end of the power supply assembly 2. When the logic card is powered on through the logic card power-on pin IN, the logic card starts to judge in real time whether the voltage difference between the two ends of the drive motor contactor KM1 is less than the set voltage difference. Once the voltage difference is less than the set voltage difference, the drive motor contactor KM1 will be controlled to close. Once the power supply pin of the logic card is powered off, the drive motor contactor KM1 will be disconnected accordingly.

[0042] In the present application, the power pin IN on the logic card and the power supply assembly 2 are connected via the second switch K2 in the dual-way switch 4, and the path between the power supply assembly 2 and the logic card is connected only when the second switch K2 is closed. The second switch K2 and the first switch K1 are dual-way switches 4 that are synchronously disconnected and synchronously connected. Obviously, when the key is pulled out of the key switch, the first switch K1 and the second switch K2 are disconnected at the same time, and a closed loop cannot be formed between the logic card and the drive motor contactor KM1 and the energy storage element inside the drive motor controller 1. That is to say, when the second switch K2 is disconnected, even if the internal energy storage element of the drive motor controller 1 is discharged, since the logic card power-on pin IN of the logic card and the drive motor contactor KM1 are disconnected from each other, the energy storage element of the drive motor controller 1 cannot supply power to the logic card. Therefore, as soon as the second switch K2 is disconnected, the logic card is immediately powered off, and accordingly, the drive motor contactor KM1 is also immediately disconnected. Even if the two-way switch 4 is closed again in a short time, the first pre-charging circuit 3 needs to charge the two ends of the drive motor contactor KM1 before it can be closed, thereby avoiding the problem of damage to the internal circuit elements of the drive motor controller 1 due to instantaneous high current.

[0043] Combination Figure 1It can be seen that for the first pre-charging circuit 3, the driving motor contactor KM1 and the power pin IN on the logic card, the first end of the first pre-charging circuit 3 and the first end of the driving motor contactor KM1 are both connected to the power supply output end of the power supply component 2, and the power pin IN on the logic card is also connected to the power supply output end through the second switch K2.

[0044] Obviously, if the dual-way switch 4 in this embodiment has only one first switch K1 and does not include the second switch K2, that is to say, the power pin IN on the logic card is directly connected to the power output end of the power supply component 2. When the power output end of the power supply component 2 no longer outputs the power supply voltage because the first switch K1 is suddenly disconnected, the drive motor controller 1 functions as its internal energy storage element, and the logic card pin IN of the logic card is equivalent to forming a closed loop with the drive motor contactor KM1 and the energy storage element, thereby supplying power to the logic card, so that the logic card has a power supply voltage for a short time, and the drive motor contactor KM1 will not be disconnected. If the first switch K1 is turned on again at this time, it is obvious that the power output end of the power supply component 2 outputs a power supply voltage and instantly gives a large instantaneous current to the internal circuit elements of the drive motor controller 1, so that there is a risk of damage to the internal elements of the drive motor controller 1.

[0045] In the present application, a second switch K2 is provided between the logic card power-on pin IN and the first pre-charging circuit 3 of the logic card, which is disconnected and connected synchronously with the first switch K1, so that when the first switch K1 is disconnected, the logic card cannot form a power supply circuit with the drive motor contactor KM1 and the energy storage element inside the drive motor controller 1 because the second switch K2 is also disconnected, thereby powering off the logic card, and correspondingly, the drive motor contactor KM1 is disconnected; when the first switch K1 is connected again, the drive motor contactor KM1 is also in a disconnected state, and the first pre-charging circuit 3 is required to charge the voltage at both ends of the contactor to a very small voltage difference before it can be closed, thereby avoiding the problem that the power supply voltage output by the power supply component is directly connected to the internal components of the drive motor controller 1, causing damage to the internal components of the drive motor controller 1.

[0046] To summarize, the present application sets a dual-way switch in the power supply circuit of the drive motor controller, and utilizes the first switch and the second switch in the dual-way switch to synchronously open and close. When the first switch is opened to control the power supply component to interrupt the output of the power supply voltage, the second switch can also disconnect the closed loop between the logic card and the energy storage element inside the drive motor controller, so that once the power supply component interrupts the output of the power supply voltage, the drive motor contactor is also immediately disconnected; this is equivalent to achieving the effect of synchronous control of whether the power supply component outputs the power supply voltage and whether the drive motor contactor is disconnected to a certain extent, thereby avoiding the first switch that controls the power supply component to output the power supply voltage suddenly disconnecting and connecting the internal circuit elements of the drive motor controller, thereby ensuring the power supply safety of the drive motor controller.

[0047] Based on the above discussion, in another optional embodiment of the present application, the power supply component 2 includes a power supply component, a second pre-charging circuit 21 and a discharge contactor KM2;

[0048] The first end of the discharge contactor KM2 is connected to the output end of the power supply assembly; the second end of the discharge contactor KM2 is connected to the power supply input end of the drive motor controller 1; the two connection terminals of the second pre-charging circuit 21 are respectively connected to the first end and the second end of the discharge contactor KM2; the first switch K1 is connected to the second pre-charging circuit 21;

[0049] When the first switch K1 is closed, the second pre-charging circuit 21 charges the first and second ends of the discharge contactor KM2; when the voltage difference between the first and second ends of the discharge contactor KM2 is less than the second preset voltage difference, the discharge contactor KM2 is closed.

[0050] refer to Figure 1 For the power supply component, the output of its power supply voltage is controlled by whether the discharge contactor KM2 is turned on or not. It is also considered that when the voltage difference between the two ends of the discharge contactor KM2 is large, it is easy to generate high current at the moment of connection to damage the discharge contactor KM2. For this reason, in this embodiment, the two ends of the discharge contactor KM2 are further provided with a second pre-charging circuit 21, so that the second pre-charging circuit 21 is connected in parallel to the discharge contactor KM2. When the first switch K1 in the two-way switch 4 is closed, the second pre-charging circuit 21 starts to charge the two ends of the discharge contactor KM2, and when the voltage difference between the two ends of the discharge contactor KM2 is less than the set voltage difference, the discharge contactor KM2 is closed.

[0051] For the first pre-charging circuit 3 and the second pre-charging circuit 21, the first preset voltage difference and the second preset voltage difference respectively corresponding to the two may be the same or different, and this application does not make any specific limitation on this.

[0052] Different circuit structures may be used for the first pre-charging circuit 3 and the second pre-charging circuit 21 .

[0053] Based on the above discussion, it can be determined that the charging of the two ends of the drive motor contactor KM1 by the first pre-charging circuit 3 in the present application is mainly determined by whether the power supply output end of the first pre-charging circuit 3 and the power supply component 2 output a power supply voltage, and it is not necessary to set other control circuits to control whether it is charged or not. Therefore, in an optional embodiment of the present application, the first pre-charging circuit 3 can be composed of a diode D and a resistor element R1 connected in series. The positive pole of the diode D is connected to the power supply output end of the power supply component 2 and the first end of the drive motor contactor KM1, the negative pole is connected to the first end of the resistor element R1, and the second end of the resistor element R1 is connected to the second end of the drive motor contactor KM1. The resistor element R2 is a high-resistance resistor, which avoids the problem of excessive current in the first pre-charging circuit 3 when the power supply voltage is turned on, and the diode D can avoid the power supply output end of the power supply component 2 from stopping power supply, and the energy storage element in the drive motor controller 1 releases electric energy to charge the power supply output end of the power supply component 2 in reverse.

[0054] As for the second pre-charging circuit 21, as described above, it is controlled by the disconnection and connection of the first switch K1, and only when the first switch K1 is turned on, it charges the two ends of the discharge contactor KM2. To this end, in an optional embodiment of the present application, the power supply component 2 may further include:

[0055] DC-DC converter 23 and BMS device 22;

[0056] A first end of the first switch K1 is connected to the output end of the power supply assembly, and a second end is connected to the BMS device 22 via the DC-DC converter 23;

[0057] The first output terminal and the second output terminal of the BMS device 22 are respectively connected to the second pre-charging circuit 21 and the discharge contactor KM2, and are used to control the pre-charging circuit to charge the first end and the second end of the discharge contactor KM2 of the second pre-charging circuit 21 when the first switch K1 is closed;

[0058] When the voltage difference between the first end and the second end of the discharge contactor KM2 is less than the second preset voltage difference, the discharge contactor KM2 is controlled to close.

[0059] The BMS device 22 is a battery management system, which controls whether the second pre-charging circuit 21 is charged or not by disconnecting and connecting the first switch K1. In this embodiment, the first switch K1 is used to control whether the power supply component and the BMS device 22 are connected or not. The first switch K1 is connected to the BMS device 22 through the DC-DC converter 23, and is also connected to the power supply component to form a closed loop. When the first switch K1 is closed, the BMS device 22 is powered by the power supply component, and can start to control the second pre-charging circuit 21 to charge the discharge contactor KM2. When the voltage difference between the two ends of the discharge contactor KM2 is small, the BMS device 22 controls its closure.

[0060] Because the second pre-charging circuit 21 needs to charge both ends of the discharge contactor KM2 under the control of the BMS device 22, therefore, in an optional embodiment of the present application, the second pre-charging circuit 21 may include:

[0061] Pre-charging contactor KM3 and pre-charging resistor R2; the switch input end of the pre-charging contactor KM3 is connected to the first end of the discharge contactor KM2, the switch output end is connected to the first end of the pre-charging resistor R2, the inductor input end and the inductor output end are connected to the BMS device 22; the second end of the pre-charging resistor R2 is connected to the second end of the discharge contactor KM2.

[0062] The circuit structure of the second pre-charging circuit 21 in this embodiment is different from that of the first pre-charging circuit 3. It includes a pre-charging contactor KM3 component, which is controlled by the BMS device 22. The discharge contactor KM2 is charged only when the BMS device 22 is powered on by closing the pre-charging contactor KM3. Similarly, the pre-charging resistor R2 is also used to avoid the problem of excessive current when the pre-charging contactor KM3 is turned on, and a resistor with a relatively large resistance value is used.

[0063] Of course, in practical applications, it is not necessary to provide the BMS device 22 in the power supply assembly 2, or it is not necessary to provide the discharge circuit of the discharge contactor KM2. Figure 1 As shown in the figure, a circuit is formed by connecting the pre-charging contactor KM3 and the pre-charging resistor R2 in series. A circuit structure similar to the first pre-charging circuit 3 can also be used. When the first switch K1 is closed, the second pre-charging circuit 21 does not need to be controlled by a control device such as a BMS device 22, but automatically charges the two ends of the discharge contactor KM2, etc., and the technical solution of the present application can also be realized.

[0064] In addition, for the first pre-charging circuit 3, it is not necessary to use a circuit formed by a diode D and a resistor R2, and it is also possible to use circuit elements such as contactors to control the opening and closing of the circuit under specific control conditions, etc. This application does not make specific restrictions on this.

[0065] Based on the above discussion, the industrial vehicle lithium battery assembly pre-charging control system as described in any of the above items in this application can be applied to engineering vehicles such as excavators and cranes, and other vehicles with drive motors such as trucks are not excluded.

[0066] The industrial vehicle lithium battery assembly pre-charging control system described above in the present application is applied to industrial vehicles, which can avoid damage to the instantaneous high current of the drive motor controller caused by rapid insertion and removal of the key during vehicle use, thereby improving the safety of the drive motor controller to a certain extent, thereby ensuring the application performance of the industrial vehicle.

[0067] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0068] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An industrial vehicle lithium battery assembly pre-charge control system, characterized in that: It includes a power supply component for supplying power to a drive motor controller; a drive motor contactor and a first pre-charging circuit connected between a power supply output end of the power supply component and a power supply input end of the drive motor controller; Also included is a two-way switch, the two-way switch comprising a first switch and a second switch that are synchronously opened and synchronously closed; The first switch is connected to the power supply component, and when the first switch is closed, the power supply output end of the power supply component outputs a power supply voltage; A first end of the second switch is connected to a power supply output end of the power supply assembly, and a second end is connected to an electrical pin on a logic card of the drive motor controller; The drive motor contactor is used to close when the first pre-charging circuit charges the two contact terminals of the drive motor contactor with the supply voltage until the voltage difference is not greater than the first preset voltage difference, so that the power supply component supplies power to the drive motor controller; When the power pin on the logic card is powered off, the drive motor contactor is disconnected.

2. The industrial vehicle lithium battery assembly pre-charge control system according to claim 1, characterized in that: The power supply component includes a power supply component, a second pre-charging circuit and a discharge contactor; The first end of the discharge contactor is connected to the output end of the power supply assembly; the second end of the discharge contactor is connected to the power supply input end of the drive motor controller; the two wiring terminals of the second pre-charging circuit are respectively connected to the first end and the second end of the discharge contactor; the first switch is connected to the second pre-charging circuit; When the first switch is closed, the second pre-charging circuit charges the first end and the second end of the discharge contactor; when the voltage difference between the first end and the second end of the discharge contactor is less than a second preset voltage difference, the discharge contactor is closed.

3. The industrial vehicle lithium battery assembly pre-charge control system according to claim 2, characterized in that: The power supply assembly also includes a DC-DC converter and a BMS device; The first end of the first switch is connected to the output end of the power supply component, and the second end is connected to the BMS device through the DC-DC converter; the first output end and the second output end of the BMS device are respectively connected to the second pre-charging circuit and the discharge contactor, and are used to control the second pre-charging circuit to charge the first end and the second end of the discharge contactor when the first switch is closed; and when the voltage difference between the first end and the second end of the discharge contactor is less than the second preset voltage difference, control the discharge contactor to close.

4. The industrial vehicle lithium battery assembly pre-charge control system as claimed in claim 3, characterized in that: The second pre-charging circuit includes a pre-charging contactor and a pre-charging resistor; the switch input end of the pre-charging contactor is connected to the first end of the discharge contactor, the switch output end is connected to the first end of the pre-charging resistor, the inductor input end and the inductor output end are connected to the BMS device; the second end of the pre-charging resistor is connected to the second end of the discharge contactor.

5. The industrial vehicle lithium battery assembly pre-charge control system according to claim 2, characterized in that: The power supply component is a lithium battery.

6. The industrial vehicle lithium battery assembly pre-charge control system according to claim 1, characterized in that: The first precharge circuit includes a diode and a resistance element connected in series.

Images