A power protection system and method for double limiting the whole vehicle action of a forklift truck

Abstract

The application belongs to a power protection system and method for double limiting the whole vehicle action of a forklift, characterized in that it comprises a lithium battery pack, a lithium battery thermal management module, a lithium battery external output control module, a lithium battery charging and control module, a lithium battery power management module and a lithium battery fault limiting module, characterized in that the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is electrically connected with the lithium battery external output control module, the lithium battery charging and control module and the lithium battery fault limiting module respectively. Two fault reminding modes of message setting and hardware reminding are set to double remind the motor controller action, increase the stability, diversity and security of fault processing, increase the relay power-off recovery secondary tube, provide the DCDC life and avoid frequent maintenance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of forklift battery protection, and specifically relates to a power supply protection system and method for double-limiting forklift vehicle action. BACKGROUND

[0002] At present, there are a large number of non-urban road vehicles on the market, especially lithium battery vehicles, that is, electric vehicles equipped with lithium ion batteries. In recent years, the environmental problems caused by traditional internal combustion engine vehicles and the shortage of oil resources have made people turn their sights to new energy vehicles. Pure electric vehicles have become an important development direction of electric vehicles because they can truly realize "zero emission". Lithium ion batteries have become the ideal power source for the new generation of electric vehicles due to their excellent performance.

[0003] Since the lithium battery vehicle has the performance of overcharging, overdischarging, overtemperature and overcurrent, if overcharging, overdischarging, overtemperature and overcurrent faults occur during driving, the vehicle needs to be reduced in driving speed or even stopped, which will cause damage to the lithium battery, and sudden speed reduction or stopping while driving on the road will also seriously affect the personal safety of the driver and passengers. SUMMARY

[0004] In order to make up for the shortcomings of the prior art, the application provides a power supply protection system and method for double-limiting forklift vehicle action.

[0005] The power supply protection system for double-limiting forklift vehicle action comprises a lithium battery pack, a lithium battery thermal management module, a lithium battery external output control module, a lithium battery charging and control module, a lithium battery power management module and a lithium battery fault limiting module, wherein the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is electrically connected with the lithium battery external output control module, the lithium battery charging and control module and the lithium battery fault limiting module respectively.

[0006] The power supply protection system for double-limiting forklift vehicle action comprises a lithium battery pack, a lithium battery thermal management module, a lithium battery external output control module, a lithium battery charging and control module, a lithium battery power management module and a lithium battery fault limiting module, wherein the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is electrically connected with the lithium battery external output control module, the lithium battery charging and control module and the lithium battery fault limiting module respectively.

[0007] The power supply protection system for double-limiting forklift vehicle action comprises a lithium battery pack, a lithium battery thermal management module, a lithium battery external output control module, a lithium battery charging and control module, a lithium battery power management module and a lithium battery fault limiting module, wherein the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is electrically connected with the lithium battery external output control module, the lithium battery charging and control module and the lithium battery fault limiting module respectively.

[0008] The power supply protection system for double-limiting forklift vehicle action comprises a lithium battery pack, a lithium battery thermal management module, a lithium battery external output control module, a lithium battery charging and control module, a lithium battery power management module and a lithium battery fault limiting module, wherein the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is electrically connected with the lithium battery external output control module, the lithium battery charging and control module and the lithium battery fault limiting module respectively.

[0009] The double restriction forklift vehicle action power protection system, characterized in that the pre-charge circuit includes pre-charge R1 and pre-charge relay K5, and the discharge communication port is a key switch K6.

[0010] The double restriction forklift vehicle action power protection system, characterized in that the lithium battery charging and control module includes a charging relay K1, a charging port, and A+ and A- ports and a charging CAN in the charging port.

[0011] The double restriction forklift vehicle action power protection system, characterized in that the lithium battery fault limitation module includes a conversion power supply DCDC1, a diode D1, a limitation action relay K10, and a vehicle CAN.

[0012] The double restriction forklift vehicle action power protection system, characterized in that it further includes a motor controller, one end of the vehicle CAN is connected to the lithium battery power management module, the other end is connected to the motor controller, and the limitation action relay K10 is controlled.

[0013] A double restriction forklift vehicle action method, characterized in that it includes the following steps: when the lithium battery pack is in a normal discharge process, the key switch K6 is in a closed state, the pre-charge relay K5 is closed, the K4 discharge relay is closed after 500 ms, and the pre-charge relay is disconnected after 1 s, and the power-up is completed.

[0014] If the discharge heating temperature is in the range of -10 to 5 degrees Celsius, the heating negative relay K2 and the heating positive relay K3 are closed for heating.

[0015] If the key is turned off, the all-in-one BMS enters a sleep state, and all outputs are turned off.

[0016] When the lithium battery pack is in a normal plug-in charging process, A+ and A- in the charging port activate the all-in-one BMS, and there is a charging message, then it is judged as a charging mode, the charging relay K1 is closed, the charger detects the charging port voltage, and outputs the current according to the current requested by the message, and if it is full or does not want to charge in the middle, then A+ and the charging CAN signal are disconnected, and the charging is turned off.

[0017] The vehicle CAN has a fault reporting message, including a slight fault and a serious fault, and the judgment and reporting of the two fault methods.

[0018] The double restriction forklift vehicle action method, characterized in that when a slight fault occurs, only the fault message is reported, and the motor controller does not process temporarily.

[0019] If a serious fault occurs, a serious fault message is reported in a message, and at the same time, the BMS control pin is lighted, the DCDC1 is activated, the output end has electricity, the limit action relay K10 is driven, the switch of the whole vehicle controller is closed, the switch quantity is detected, the conversion from active signal to passive signal is realized, the motor controller makes the limit lifting and walking action according to the switch quantity action and the two kinds of reminders in the whole vehicle message, so as to reduce the fault;

[0020] After the fault disappears, the reporting message and the BMS control output are both closed, which proves that the battery fault disappears, and the whole vehicle is allowed to act again.

[0021] After the driving voltage disappears, the limit action relay K10 coil loses electricity, and K10 is reopened.

[0022] The diode D1 is used to prevent the reverse voltage generated when K10 is reopened from impacting the DC output port.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The two fault reminding modes of reporting message and hardware reminder are set, the motor controller is double reminded to act, the stability, diversity and security of fault processing are increased, the relay power-off recovery diode is set, the DCDC service life is provided, and frequent maintenance is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The module structure diagram of the present application;

[0026] Fig. 2 The circuit principle diagram of the present application. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] The present application will be further described below with reference to the drawings.

[0029] As Figs. 1-2As shown, a double restriction forklift truck action power protection system, including lithium battery group 1, lithium battery thermal management module 2, lithium battery external output control module 3, lithium battery charging and control module 4, lithium battery power management module 5 and lithium battery fault limiting module 6, characterized by lithium battery group 1 is respectively connected with lithium battery thermal management module 2, lithium battery external output control module 3 and lithium battery power management module 5, lithium battery power management module 5 is respectively connected with lithium battery external output control module 3, lithium battery charging and control module 4 and lithium battery fault limiting module 6.

[0030] Lithium battery group 1 includes lithium iron phosphate battery B1, B2, lithium battery power management module 5 includes integrated BMS and shunt FQ1, FQ2. Lithium battery thermal management module 2 includes heating film H1, H2 and heating negative relay K2 and heating positive relay K3. Lithium battery external output control module 3 includes precharge circuit, discharge relay K4, discharge port and discharge communication port. The precharge circuit includes precharge R1 and precharge relay K5, and the discharge communication port is the key switch K6. Lithium battery charging and control module 4 includes charging relay K1, charging port, and the charging port includes A+ port, A- port and charging CAN.

[0031] Lithium battery fault limiting module 6 includes DCDC1, diode D1, limit action relay K10, vehicle CAN, including motor controller, one end of vehicle CAN is connected to lithium battery power management module 5, the other end is connected to motor controller, and is controlled through limit action relay K10.

[0032] Specifically, B1.B2 is a battery, and at present we take the 2 parallel 8 series lithium iron phosphate battery module as an example, and the number and capacity can be increased or decreased, H1.H2 is a heating film, which is a resistive load, and can generate heat by using the principle of special material resistance, which can generate heat to heat the module, so that this project can be suitable for a wider temperature range, K2.K3 is a heating positive and negative relay, which is used to control the opening and closing of the heating film load, and K4 is a discharge relay, which is used to control the opening and closing of the battery external output, K1 is a charging relay, which is used to control the start and stop of charging, K5 and R1 form a precharge branch, which protects the main relay accordingly, K6 is a key switch, which is used to activate BMS, which is a self-locking switch, which is used to control the activation and dormancy of BMS, K10 is a limit action relay, DCDC1 is a 24V to 12V DC voltage conversion module, which is used to convert 24V power into 12V, to match the coil voltage of K10, D1 is a diode, which is used to limit the rebound voltage when the coil is disconnected. The vehicle CAN is connected with the motor controller, which is used to realize the communication between the BMS and the motor controller, R2 and R3 are respectively 120 ohm terminal resistors, which are used to maintain the stability of the communication.

[0033] A method for double limiting the whole vehicle action of a forklift, characterized in that it comprises the following steps: when the lithium battery pack is in a normal discharging process, the key switch K6 is in a closed state, the pre-charging relay K5 is closed, the K4 discharging relay is closed after 500 ms, and the pre-charging relay is disconnected after another 1 s, and the power-up is completed;

[0034] If the discharging heating temperature is in the range of -10 to 5 degrees Celsius, the heating negative relay K2 and the heating positive relay K3 are closed for heating;

[0035] If the key is turned off, the all-in-one BMS enters a sleep state, and all outputs are turned off;

[0036] When the lithium battery pack is in a normal gun charging process, A+ and A- in the charging port activate the all-in-one BMS, and there is a charging message, then it is judged as a charging mode, the charging relay K1 is closed, the charger detects the charging port voltage, and outputs the current according to the current requested by the message, and if it is full or does not want to charge in the middle, then A+ and the charging CAN signal are disconnected, and the charging is turned off;

[0037] There are fault reporting messages in the whole vehicle CAN, including the judgment and reporting of two fault laws of slight fault and serious fault.

[0038] When a slight fault occurs, only the fault message is reported, and the motor controller does not process temporarily; if a serious fault occurs, the serious fault message is reported in the message, and the BMS control pin is lit at the same time, the DCDC1 is activated, the output end has electricity, the action relay K10 is driven, the switch of the whole vehicle controller is closed, the switch quantity is detected, the active signal is converted to passive signal, and the motor controller makes the action of limiting lifting and walking according to the switch quantity action and the two reminders in the whole vehicle message, so as to reduce the fault;

[0039] After the fault disappears, the reporting message and the BMS control output are turned off, proving that the battery fault disappears, and the whole vehicle is allowed to act again;

[0040] After the driving voltage disappears, the K10 coil of the action limiting relay K10 loses power, and K10 is reopened;

[0041] The diode D1 is used to prevent the reverse voltage generated when K10 is reopened from impacting the DC output port.

[0042] In use, each branch has a shunt, which can display the current state of each branch, detect the hardware state of each branch, increase the system error detection capability, and add a pre-charging branch to protect the main circuit relay.

[0043] Set up two kinds of fault alarm mode of message and hardware alarm, double alarm motor controller action, increase the stability, diversity, security of fault processing. Increase the relay power recovery secondary tube, provide DCDC life, avoid frequent maintenance. Increase the debugging interface, improve the system maintainability.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual restriction forklift truck whole vehicle action power supply protection method, comprising a lithium battery pack (1), a lithium battery thermal management module (2), a lithium battery external output control module (3), a lithium battery charging and control module (4), a lithium battery power management module (5) and a lithium battery fault limitation module (6), the lithium battery pack (1) is respectively connected with the lithium battery thermal management module (2), lithium battery external output control module (3) and lithium battery power management module (5), the lithium battery power management module (5) is respectively connected with the lithium battery external output control module (3), lithium battery charging and control module (4) and lithium battery fault limitation module (6), characterized in that, The lithium battery pack (1) includes lithium iron phosphate batteries B1, B2; the lithium battery power management module (5) includes an integrated machine BMS; the lithium battery thermal management module (2) includes heating films H1, H2 and a heating negative relay K2 and a heating positive relay K3; the lithium battery external output control module (3) includes a pre-charging circuit, a discharge relay K4, a discharge port and a discharge communication port; the pre-charging circuit includes a pre-charging R1 and a pre-charging relay K5, and the discharge communication port is a key switch K6; the lithium battery charging and control module (4) includes a charging relay K1 and a charging port, and the charging port includes an A+ port, an A- port and a charging CAN; the lithium battery fault limiting module (6) includes a conversion power supply DCDC1, a diode D1, a limiting action relay K10 and a vehicle CAN; The method comprises the following steps: When the lithium battery pack is in a normal discharging process, the key switch K6 is in a closed state, the pre-charging relay K5 is closed, the discharge relay K4 is closed after 500 ms, and the pre-charging relay is disconnected after 1 s, and the power-on is completed; If the discharge heating temperature is in the range of -10 to 5 degrees Celsius, the heating negative relay K2 and the heating positive relay K3 are closed, and heating is performed; If the key is turned off, the integrated machine BMS enters a sleep state, and all outputs are turned off; When the lithium battery pack is in a normal gun charging process, the A+ port and the A- port in the charging port activate the integrated machine BMS, and there is a charging message, then it is judged as a charging mode, the charging relay K1 is closed, the charging machine detects the charging port voltage, and outputs the current according to the current requested by the message, and if it is full or does not want to charge in the middle, the A+ port and the charging CAN signal are disconnected, and the charging is turned off; The vehicle CAN has a fault reporting message, including a slight fault and a serious fault, and the judgment and reporting of the two fault laws; When a slight fault occurs, only the fault message is reported, and the motor controller does not process temporarily; If a serious fault occurs, the serious fault message is reported in the message, and the integrated machine BMS control pin is lit at the same time, the conversion power supply DCDC1 is activated, the output end has electricity, the limiting action relay K10 is driven, the switch of the vehicle controller is closed, the switch quantity is detected, the active signal is converted to the passive signal, and the motor controller performs the limiting lifting and walking action according to the switch quantity action and the two reminders in the vehicle message, so as to reduce the fault.

2. The power supply protection method for double-restricted forklift truck whole vehicle motion according to claim 1, characterized by, It also includes a motor controller, one end of the vehicle CAN is connected to the lithium battery power management module (5), the other end is connected to the motor controller, and the limiting action relay K10 is controlled.

3. The power supply protection method for double-limiting forklift vehicle action according to claim 1, characterized in that After the fault disappears, the reporting message and the integrated machine BMS control output are turned off, proving that the battery fault disappears, and the vehicle is allowed to act again; After the driving voltage disappears, the limiting action relay K10 coil loses power, and the limiting action relay K10 is reopened; The diode D1 is used to prevent the reverse voltage generated when the limiting action relay K10 is reopened from impacting the output port of the conversion power supply DCDC1.

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