A shielding method applied to a new battery fault shielding system

Abstract

The present invention relates to a shielding method for a new type of battery fault shielding system, wherein the shielding system includes a lithium battery heating module, a lithium battery pack, a lithium battery external output control module, a lithium battery charging control module, a lithium battery power management module, a self-resetting switch fault shielding module, a lithium battery communication debugging interface, and a lithium battery external power supply module. The lithium battery pack is electrically connected to the lithium battery heating module, the lithium battery external output control module, the lithium battery charging control module, and the lithium battery power management module, respectively. The lithium battery charging control module is electrically connected to the lithium battery external output control module and the lithium battery power management module, respectively. The lithium battery power management module is also electrically connected to the self-resetting switch fault shielding module, the lithium battery communication debugging interface, and the lithium battery external power supply module, respectively. The present application adds a fault shielding function, and the shielding adopts a self-resetting switch to increase system safety.

Description

Technical Field

[0001] The invention belongs to the technical field of forklift lithium batteries, and in particular is a shielding method applied to a novel battery fault shielding system. Background Art

[0002] Due to the advantages of long cycle life and light weight, lithium battery systems are increasingly being used in off-road vehicles. However, to protect the safety of lithium batteries, they must be protected from overcharge, over-discharge, and low-temperature discharge. Therefore, the BMS needs to provide various protections for the various physical environments of the battery. The most severe protection strategy will cut off the relay, etc., making the entire vehicle inoperable. In response to the above situation, this patent discloses a lithium battery fault method. Not only can the BMS protect the battery, but it can also temporarily shield the battery from faults, allowing normal use in a short period of time and facilitating the handling of the faulty vehicle. This method solves the problem of forklifts being unable to operate due to secondary faults in the field. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the present invention relates to providing a technical solution of a shielding method applied to a novel battery fault shielding system to solve the problem that a forklift cannot move due to a secondary fault in the field.

[0004] The shielding method applied to a new battery fault shielding system, wherein the new battery fault shielding system includes a lithium battery heating module, a lithium battery pack, a lithium battery external output control module, a lithium battery charging control module, a lithium battery power management module, a self-reset switch fault shielding module, a lithium battery communication debugging interface and a lithium battery external power supply module, the lithium battery pack is electrically connected to the lithium battery heating module, the lithium battery external output control module, the lithium battery charging control module and the lithium battery power management module respectively, the lithium battery charging control module is electrically connected to the lithium battery external output control module and the lithium battery power management module respectively, and the lithium battery power management module is also electrically connected to the self-reset switch fault shielding module, the lithium battery communication debugging interface and the lithium battery external power supply module respectively;

[0005] The lithium battery power management module includes a BMS integrated device; the lithium battery external power supply module includes a charging and debugging port, which is equipped with a vehicle 12V+ and vehicle 12V-; the lithium battery external power supply module also includes a DC-DC and a holding relay K1; the self-resetting switch fault shielding module includes a signal detection resistor R2 and a self-resetting switch K7. When the self-resetting switch K7 is pressed, the temperature detection point can sense the connection of the signal detection resistor R2;

[0006] The shielding method includes the following steps: first, connecting the external power supply to the A+ interface of the BMS all-in-one machine to activate the BMS all-in-one machine, closing the pre-charge relay K3 after the self-test is completed, and closing the discharge relay K4 after the pre-charge is completed to realize external output;

[0007] There are two charging modes, including key-off mode and key-on mode. In key-off mode: when the auxiliary power of the external charger is used from the two power supply ports CHG-A+ and CHG-A- in the charging debugging port to activate the A+ pin of the BMS integrated machine, and CC2 is detected at the same time, it enters the charging mode and performs the corresponding charging configuration; when charging in key-on mode, the A+ pin of the BMS integrated machine has a power supply signal. At this time, CC2 and charging message are detected, it is considered to be in charging mode and the corresponding charging configuration is performed;

[0008] When a serious fault of too low a single battery occurs in the vehicle, click the self-reset switch K7, the BMS all-in-one can detect CC2 and restore the serious fault to a minor fault. This process is realized by the comprehensive implementation of the BMS software and hardware. The serious fault of too low a single battery is restored to a minor fault of too low a single battery, allowing the vehicle to drive, but it is necessary to limit the lifting to ensure that the vehicle can drive for a period of time. In response to the emergency treatment plan, the fault function is shielded and the fault judgment is restored after restarting the battery;

[0009] Serious single-cell low voltage faults include single-cell voltage being too high, temperature being too high, or temperature being too low; diodes are respectively provided on the vehicle power supply port and the charging power supply port to prevent cross-current during normal vehicle operation and ensure stable operation between each other. The vehicle power supply port is the vehicle 12V+ and vehicle 12V-, and the charging power supply port is A+ and A- in the charging debugging port.

[0010] Furthermore, the lithium battery heating module includes heating films H1 and H2, a heating positive relay K2 and a heating negative relay K5.

[0011] Furthermore, the lithium battery external output control module includes a pre-charging circuit, a discharge relay K4, and a discharge port.

[0012] Furthermore, the pre-charging circuit includes a pre-charging relay K3 and a pre-charging resistor R1, and the discharge port is provided with a total positive terminal and a total negative terminal.

[0013] Furthermore, the lithium battery charging control module includes a charging port and a charging relay K6, and the charging port is provided with a positive charging electrode and a negative charging electrode.

[0014] Furthermore, the lithium battery communication debugging interface includes a debugging port, and the debugging port is provided with a vehicle debugging CANH, a vehicle debugging CANL, a charging debugging CANL, a charging debugging CANH, an intranet debugging CANL, an intranet debugging CANH and a PE end.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The switch uses an IP67 design for enhanced sealing and performance, while two diodes provide increased system stability. The BMS's PE line is connected to the enclosure, and the PE terminal of the external charging cable is also connected to the enclosure to achieve equal potential for charging, enhancing charging reliability. The PE terminal is also connected to the debug port. During testing, the PE terminal can be connected to the internal PE terminal via the external communication interface, increasing external testing capabilities.

[0017] Each debug port is connected to a single point for improved maintainability; the charging and communication ports share a common temperature point, saving plug-in points and increasing integration convenience. A fault shielding function has been added to facilitate emergency handling when system issues arise. A self-resetting switch prevents users from having to re-operate after shielding a fault, enhancing system security. Fault recovery within 5 minutes further enhances system security. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a module of a battery fault shielding method according to the present invention;

[0019] Figure 2 This is the circuit schematic. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1-2As shown, a new type of battery fault shielding system includes a lithium battery heating module 1, a lithium battery pack 2, a lithium battery external output control module 3, a lithium battery charging control module 4, a lithium battery power management module 5, a self-reset switch fault shielding module 6, a lithium battery communication debugging interface 7 and a lithium battery external power supply module 8. The lithium battery pack 2 is electrically connected to the lithium battery heating module 1, the lithium battery external output control module 3, the lithium battery charging control module 4 and the lithium battery power management module 5 respectively. The lithium battery charging control module 4 is electrically connected to the lithium battery external output control module 3 and the lithium battery power management module 5 respectively. The lithium battery power management module 5 is also electrically connected to the self-reset switch fault shielding module 6, the lithium battery communication debugging interface 7 and the lithium battery external power supply module 8 respectively.

[0023] The lithium battery heating module 1 includes heating films H1 and H2 , a heating positive relay K2 , and a heating negative relay K5 .

[0024] The lithium battery external output control module 3 includes a pre-charging circuit, a discharge relay K4 , and a discharge port 31 .

[0025] The pre-charging circuit includes a pre-charging relay K3 and a pre-charging resistor R1 , and the discharge port 31 is provided with a total positive terminal and a total negative terminal.

[0026] The lithium battery charging control module 4 includes a charging port 41 and a charging relay K6 . The charging port 41 is provided with a positive charging electrode and a negative charging electrode.

[0027] The lithium battery communication debugging interface 7 includes a debugging port 71, in which are provided a vehicle debugging CANH, a vehicle debugging CANL, a charging debugging CANL, a charging debugging CANH, an intranet debugging CANL, an intranet debugging CANH and a PE terminal.

[0028] The self-resetting switch fault shielding module 6 includes a signal detection resistor R2 and a self-resetting switch K7. When the self-resetting switch K7 is pressed, the temperature detection point can feel the access of the signal detection resistor R2.

[0029] The lithium battery power management module 5 includes a BMS all-in-one machine; the lithium battery external power supply module 8 includes a charging and debugging port 81, in which the charging and debugging port 81 is provided with a vehicle 12V+ and a vehicle 12V- as well as a DCDC and a holding relay K1.

[0030] Further describe the circuit. B1 and B2 are batteries. Currently, we take a module composed of 2 parallel and 25 series lithium iron phosphate batteries as an example. The number of parallel batteries and the capacity can be increased or decreased. H1 and H2 are heating films, which are resistive loads. The principle that the resistance of special materials can generate heat can generate heat to heat the module so that this project can be applied to a wider temperature range. K2 and K5 are heating positive and heating negative relays, which are used to control the opening and closing of the heating film load. At the same time, K4 is a discharge relay, which is used to control the opening and closing of the battery's external output. K6 is a charging relay, which is used to control the start and end of charging. K3 and R1 form a pre-charge branch to provide corresponding protection for the main relay. K7 is a self-reset switch. R2 is a signal detection resistor, and is IP67. Its resistance value can be many kinds, such as 1K.

[0031] When the self-reset switch K7 is pressed, the temperature detection point can feel the connection of the signal detection resistor R2, thereby judging that there is a secondary command requirement. After connecting this switch for 5S, the current serious fault is evaluated as a minor fault. At this time, if the switch is released, there is no such signal, but the shielding effect is maintained for 5 minutes, so that the whole vehicle can maintain normal operation. The charging and discharging process is as follows.

[0032] The discharge circuit is powered by an external power supply from the vehicle's 12V+ and 12V- interfaces. The source of this power supply is an external small battery. This power supply is used to power the vehicle during normal operation. It is connected to the A+ interface of the BMS all-in-one machine to activate the BMS all-in-one machine. After the self-test is completed, the pre-charge relay is closed. After the pre-charge is completed, K4 is closed to realize external output.

[0033] There are two modes when charging: key-on and key-off. The auxiliary power of the external charger is used to activate the A+ pin of the BMS from the two power supply ports CHG-A+ and CHG-A-. At the same time, if CC2 is detected, it enters the charging mode and performs the corresponding charging configuration. When charging with the key on, there is an A+ power supply signal. At this time, if CC2 and charging message are detected, it is considered to be in charging mode and the corresponding charging configuration is performed.

[0034] A novel battery fault shielding method includes the following steps:

[0035] First, connect the external power supply to the A+ port of the BMS to activate the BMS. After the self-test is completed, close the pre-charge relay K3. After the pre-charge is completed, close the discharge relay K4 to realize external output.

[0036] There are two charging modes, including key-off mode and key-on mode. In key-off mode: when the auxiliary power of the external charger is used from the two power supply ports CHG-A+ and CHG-A- in the charging debugging port to activate the A+ pin of the BMS integrated machine, and CC2 is detected at the same time, it enters the charging mode and performs the corresponding charging configuration; when charging in key-on mode, the A+ pin of the BMS integrated machine has a power supply signal. At this time, CC2 and charging message are detected, it is considered to be in charging mode and the corresponding charging configuration is performed;

[0037] When a serious fault of single cell low occurs in the whole vehicle, click the self-reset switch K7 to restore the serious fault of single cell low to a minor fault of single cell low, allowing the whole vehicle to drive, but the lifting needs to be restricted to ensure that the whole vehicle can drive for a period of time. In response to the emergency treatment plan, the fault function is shielded and the fault judgment is restored after restarting the battery.

[0038] Serious single-cell low voltage faults include single-cell voltage too high or temperature too high or temperature too low faults; Diodes are respectively provided on the vehicle power supply port and the charging power supply port to prevent cross-current during normal vehicle operation and ensure stable operation between them.

[0039] This invention offers the following benefits: The switch utilizes an IP67 rating, enhancing sealing and product performance; two diodes increase system stability. The BMS's PE line is connected to the housing, and the PE terminal of the external charging cable is also connected to the housing, ensuring equal potential for charging and improving operational reliability. The PE terminal is also connected to the debug port, allowing for equal potential between the external communication interface and the internal PE terminal during testing, increasing external testing capabilities.

[0040] Each debug port is connected for improved maintainability, saving plug-in points and increasing integration convenience. A fault shielding function has been added to facilitate emergency handling when system issues arise. A self-resetting switch prevents users from blocking faults without re-operating, thus increasing system security. The BMS uses an internal timer to generate an interrupt when the 5-minute timer reaches a certain value. Software recovery is performed for any shielded faults, implemented through the microcontroller and its operating program. Fault recovery within 5 minutes enhances system security.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shielding method applied to a new battery fault shielding system, characterized in that: A novel battery fault shielding system comprises a lithium battery heating module (1), a lithium battery pack (2), a lithium battery external output control module (3), a lithium battery charging control module (4), a lithium battery power management module (5), a self-reset switch fault shielding module (6), a lithium battery communication debugging interface (7) and a lithium battery external power supply module (8), wherein the lithium battery pack (2) is electrically connected to the lithium battery heating module (1), the lithium battery external output control module (3), the lithium battery charging control module (4) and the lithium battery power management module (5), respectively; the lithium battery charging control module (4) is electrically connected to the lithium battery external output control module (3) and the lithium battery power management module (5), respectively; and the lithium battery power management module (5) is also electrically connected to the self-reset switch fault shielding module (6), the lithium battery communication debugging interface (7) and the lithium battery external power supply module (8); The lithium battery external output control module (3) includes a pre-charging circuit, a discharge relay K4, and a discharge port (31), wherein the pre-charging circuit includes a pre-charging relay K3 and a pre-charging resistor R1, and the discharge port (31) is provided with a total positive terminal and a total negative terminal; the lithium battery power management module (5) includes a BMS integrated machine, the lithium battery external power supply module (8) includes a charging debugging port (81), and the charging debugging port (81) is provided with a whole vehicle 12V+ and a whole vehicle 12V-, wherein the whole vehicle 12V+ and the whole vehicle 12V- are the whole vehicle power supply ports; the lithium battery external power supply module (8) also includes a DCDC and a holding relay K1; the self-reset switch fault shielding module (6) includes a signal detection resistor R2 and a self-reset switch K7, and when the self-reset switch K7 is pressed, the temperature detection point can sense the access of the signal detection resistor R2; The shielding method includes the following steps: first, connecting an external power supply to the A+ interface of the BMS all-in-one to activate the BMS all-in-one, closing the pre-charge relay K3 after the self-test is completed, and closing the discharge relay K4 after the pre-charge is completed to realize external output; There are two charging modes, including key-off mode and key-on mode. In key-off mode: when the auxiliary power of the external charger is used from the two power supply ports CHG-A+ and CHG-A- in the charging debugging port to activate the A+ pin of the BMS integrated machine, and CC2 is detected at the same time, it enters the charging mode and performs the corresponding charging configuration; when charging in key-on mode, the A+ pin of the BMS integrated machine has a power supply signal. At this time, CC2 and charging message are detected, it is considered to be in charging mode and the corresponding charging configuration is performed; When a serious fault of too low a single cell occurs in the vehicle, click the self-reset switch K7, the BMS all-in-one detects CC2, and restores the serious fault to a minor fault. This process is implemented by the BMS software and hardware. The serious fault of too low a single cell is restored to a minor fault of too low a single cell, allowing the vehicle to drive, but it is necessary to limit the lifting to ensure that the vehicle can drive for a period of time. In response to the emergency treatment plan, the fault function is shielded and the fault judgment is restored after restarting the battery; Serious single-cell low voltage faults include single-cell voltage too high or temperature too high or temperature too low faults; diodes are respectively provided on the vehicle power supply port and the charging power supply port to prevent cross-current during normal vehicle operation and ensure stable operation between them. The charging power supply port is A+ and A- in the charging debugging port (81).

2. A shielding method for a new battery fault shielding system according to claim 1, characterized in that: The lithium battery heating module (1) comprises heating films H1, H2, a heating positive relay K2 and a heating negative relay K5.

3. The shielding method applied to a new battery fault shielding system according to claim 1, characterized in that: The lithium battery charging control module (4) comprises a charging port (41) and a charging relay K6, wherein a positive charging electrode and a negative charging electrode are provided in the charging port (41).

4. The shielding method for a new battery fault shielding system according to claim 1, characterized in that: The lithium battery communication debugging interface (7) comprises a debugging port (71), wherein the debugging port (71) is provided with a vehicle debugging CANH, a vehicle debugging CANL, a charging debugging CANL, a charging debugging CANH, an intranet debugging CANL, an intranet debugging CANH and a PE terminal.

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