A new power battery system for AGV and its power-on and power-off method

Abstract

The present invention belongs to the field of forklift batteries, and specifically relates to a new power battery system for AGV and its power-on and power-off method, including a lithium battery pack, a lithium battery power management module, a lithium battery external output control module, a lithium battery charging control module, a lithium battery fast charging control module, a lithium battery communication debugging interface module, and a lithium battery power-on and power-off control module. The lithium battery pack is electrically connected to the lithium battery power management module, the lithium battery external output control module, and the lithium battery charging control module respectively. The lithium battery power management module is electrically connected to the lithium battery charging control module, the lithium battery fast charging control module, the lithium battery communication debugging interface module, and the lithium battery power-on and power-off control module respectively. The present invention is provided with two switches, namely the power-on and power-off switch K4 and the power-on and power-off switch K5. These two switches are linked through the linkage switch K8, and the linkage switch K8 is a self-resetting switch that can automatically reset, and can realize two methods of manual power-off and automatic power-off, meeting the diverse usage needs of users.

Description

Technical Field

[0001] The present invention belongs to the field of forklift batteries, and particularly relates to a new power battery system for AGV and its power-on and power-off method. Background Art

[0002] In the process of modernization and intelligentization, AGV has been increasingly used. Using lithium batteries to power AGV also improves the performance of AGV from the perspectives of cycle life and environmental protection. However, the existing lithium batteries for AGV still have the problem that they cannot be powered off due to unmanned management and automatic operation. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the present invention provides a technical solution for a new power battery system for AGV and its power-on and power-off method.

[0004] The new power battery system for AGV includes a lithium battery pack for power supply, a lithium battery power management module for controlling and managing the battery system, a lithium battery external output control module for realizing the external output of the battery system, a lithium battery charging control module for controlling the charging operation of the battery system, a lithium battery strong charging control module for realizing the strong charging function of the battery system, a lithium battery communication debugging interface module for providing communication debugging functions, and a lithium battery power-on and power-off control module for realizing the power-on and power-off of the battery system. Among them, the lithium battery pack is electrically connected to the lithium battery power management module, the lithium battery external output control module, and the lithium battery charging control module respectively, and the lithium battery power management module is electrically connected to the lithium battery charging control module, the lithium battery strong charging control module, the lithium battery communication debugging interface module, and the lithium battery power-on and power-off control module respectively.

[0005] The lithium battery external output control module of the new power battery system for AGV includes a pre-charge branch, a pre-charge relay K2, a total positive interface, and a total negative interface. Among them, the pre-charge branch includes a discharge relay K1 and a pre-charge resistor R1.

[0006] The lithium battery charging control module of the new power battery system for AGV includes a charging relay K3, a DC+ interface, and a DC- interface.

[0007] The lithium battery strong charging control module of the new power battery system for AGV includes a strong charging resistor R2 and a strong charging switch K7.

[0008] The described new power battery system for AGV is characterized in that the lithium battery power-on and power-off control module includes an external power-on and power-off switch K4, an external power-on and power-off switch K5, a holding relay K6, and a controllable voltage conversion power supply DC / DC1. The external power-on and power-off switch K5 is a normally open switch, and the power-on and power-off switch K4 is a normally closed switch. The external power-on and power-off switch K4 is connected to the external power-on and power-off switch K5 through a set linkage switch K8. The linkage switch K8 has three positions: left, middle, and right. When it is turned to the left position, both the external power-on and power-off switch K5 and the external power-on and power-off switch K4 are disconnected. When it is turned to the middle position, the external power-on and power-off switch K4 is closed, and the external power-on and power-off switch K5 is disconnected. When it is turned to the right position, both the external power-on and power-off switch K4 and the external power-on and power-off switch K5 are closed.

[0009] The described new power battery system for AGV is characterized in that the lithium battery communication and debugging interface module includes an additional power supply 12V positive interface, an additional power supply 12V negative interface, a vehicle interface, a vehicle debugging interface, and an intranet debugging interface.

[0010] The described new power battery system for AGV is characterized in that it further includes a main circuit fuse F1, a low-voltage power supply fuse F2, a diode D1, and a diode D2. Among them, the main circuit fuse F1 is electrically connected to the lithium battery pack 1 and the low-voltage power supply fuse F2 respectively. The low-voltage power supply fuse F2 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery external output control module, and the lithium battery charging control module respectively. The diode D1 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery power management module, and the diode D2 respectively. The diode D2 is electrically connected to the lithium battery power management module, the additional power supply 12V positive interface, and the additional power supply 12V negative interface respectively.

[0011] The described new power battery system for AGV is characterized in that the linkage switch K8 can automatically reset after being turned to the left or right position and then released.

[0012] The power-on and power-off method of the battery system is characterized by including

[0013] Discharge power-on: The linkage switch K8 is turned to the right position. At this time, the external power-on and power-off switch K5 is closed, and the external power-on and power-off switch K4 maintains its original state. After the external power-on and power-off switch K5 is closed, the controllable voltage conversion power supply DC / DC1 is powered on, driving the holding relay K6 to close. Then, the linkage switch K8 is released and returns to the middle position. The external power-on and power-off switch K5 returns to its original state, and the holding relay K6 and the external power-on and power-off switch K4 are conducted. The positive pole of the lithium battery pack passes through the holding relay K6 and the external power-on and power-off switch K4 to activate the controllable voltage conversion power supply DC / DC1 and supply power to the lithium battery power management module.

[0014] There are two modes for discharge power-off.

[0015] Discharge power-down mode 1: Switch the linkage switch K8 to the left gear to disconnect the external power-on / off switch K4 and the external power-on / off switch K5 as well. At this time, the DCDC is in an inactive state, and the power supply of the lithium battery power management module is cut off to achieve power-down.

[0016] Discharge power-down mode 2: When the lithium battery power management module detects that the static current continuously remains at 5A, after a period of time, the hold relay K6 is cut off. At this time, the external power-on / off switch K5 is in the off state, and both power supply circuits are disconnected.

[0017] There are two charging and power-on modes.

[0018] Charging and power-on mode 1: The vehicle sends a message through the vehicle CAN bus to inform the lithium battery power management module to power on, and the lithium battery power management module then closes the charging relay K3.

[0019] Charging and power-on mode 2: Press the fast charge switch K7. When the lithium battery power management module senses the rising edge of the fast charge switch K7 through the CC2 interface, it closes the charging relay K3.

[0020] Charging power-down mode 1: A power-down command message is transmitted from the vehicle CAN.

[0021] Charging power-down mode 2: By cutting off the external power-on / off switch K4, or when the output current to the outside is less than a certain current value within a certain period of time, the hold relay K6 is disconnected.

[0022] For the power-on / off method of the battery system, it is characterized in that the certain period of time in the discharge power-down mode 2 is 1 - 12 hours; the certain current value in the charging power-down mode 2 is 2 - 5A.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The advantages of the present invention are:

[0025] 1) The present invention solves the problem that the lithium battery for AGV cannot be powered down due to unattended automatic operation, reduces the risk of over-discharge of the battery, and increases the battery safety.

[0026] 2) Two-way switches, namely the power-on / off switch K4 and the power-on / off switch K5, are provided to meet the usage characteristics of AGV. Moreover, these two switches are linked through the linkage switch K8. The linkage switch K8 is a self-resetting switch, which can automatically reset and can also implement two ways of manual power-down and automatic power-down, meeting the diverse usage requirements of users.

[0027] 3) There are two charging methods, namely the message method and the fast charge switch method, realizing two ways of manual charging and automatic charging, meeting the diverse usage requirements of users.

[0028] 4) The boost charge switch actuates when the battery is slightly over-discharged, enabling charging and power-on, and increasing the battery maintainability.

[0029] 5) A boost charging resistor R2 is set to reduce the current at the detection port, enhancing the safety of the lithium battery power management module.

[0030] 6) A pre-charge circuit is set up to reduce the impact on the discharge relay K1 and extend the battery service life.

[0031] 7) An additional power supply 12V positive interface and an additional power supply 12V negative interface are set, diversifying the power supply sources and making it more convenient to use.

[0032] 8) A controllable voltage conversion power supply DC / DC1 is set to reduce the activation current, weaken the impact on the key switch, and extend the key switch service life. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of a new type of power battery system for AGV of the present invention;

[0034] Figure 2 It is a schematic circuit diagram of a new type of power battery system for AGV of the present invention. Detailed Embodiment

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end portion", "length", "outer end", etc. are based on the orientation or positional relationships shown in the 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 operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] The present invention will be further described below with reference to the drawings.

[0037] As Figure 1 、 2As shown in the figure, a new type of power battery system for AGV includes a lithium battery pack 1 for power supply, a lithium battery power management module 2 for controlling and managing the battery system, a lithium battery external output control module 3 for realizing the external output of the battery system, a lithium battery charging control module 4 for controlling the charging operation of the battery system, a lithium battery strong charging control module 5 for realizing the strong charging function of the battery system, a lithium battery communication debugging interface module 6 for providing communication debugging functions, and a lithium battery power-on / off control module 7 for realizing the power-on / off of the battery system. Among them, the lithium battery pack 1 is electrically connected to the lithium battery power management module 2, the lithium battery external output control module 3, and the lithium battery charging control module 4 respectively, and the lithium battery power management module 2 is electrically connected to the lithium battery charging control module 4, the lithium battery strong charging control module 3, the lithium battery communication debugging interface module 6, and the lithium battery power-on / off control module 7 respectively. Among them, the lithium battery power management module 2 is also called the battery management system, and its English abbreviation is BMS.

[0038] As an optimization: The lithium battery external output control module 3 includes a pre-charge branch, a pre-charge relay K2, a total positive interface, and a total negative interface. Among them, the pre-charge branch includes a discharge relay K1 and a pre-charge resistor R1.

[0039] As an optimization: The lithium battery charging control module 3 includes a charging relay K3, a DC+ interface, and a DC- interface.

[0040] As an optimization: The lithium battery strong charging control module 5 includes a strong charging resistor R2 and a strong charging switch K7.

[0041] As an optimization: The lithium battery communication debugging interface module 6 includes an additional power supply 12V positive interface, an additional power supply 12V negative interface, a vehicle interface, a vehicle debugging interface, and an intranet debugging interface.

[0042] As an optimization: The lithium battery power-on / off control module 7 includes an external power-on / off switch K4, an external power-on / off switch K5, a holding relay K6, and a controllable voltage conversion power supply DC / DC1. The external power-on / off switch K5 is a normally open switch, and the power-on / off switch K4 is a normally closed switch. The external power-on / off switch K4 and the external power-on / off switch K5 are connected through a set linkage switch K8. The linkage switch K8 has three positions: left, middle, and right. When it is turned to the left position, both the external power-on / off switch K5 and the external power-on / off switch K4 are disconnected; when it is turned to the middle position, the external power-on / off switch K4 is closed and the external power-on / off switch K5 is disconnected; when it is turned to the right position, both the external power-on / off switch K4 and the external power-on / off switch K5 are closed. Among them, the linkage switch K8 can automatically reset after being turned to the left or right position and released.

[0043] It should be noted that the names of the left, middle, and right positions of the linkage switch K8 in the present invention are only for the purpose of distinction, and do not limit the left position, middle position, and right position to the left, middle, and right directions respectively.

[0044] In the above structure, the discharge relay K1 is used to control the opening and closing of the battery's external output. The pre-charge resistor R1 and the pre-charge relay K2 form a pre-charge branch to perform pre-charging before power-on to avoid the impact on the discharge relay K1 caused by the external capacitive load. The controllable voltage conversion power supply DC / DC1 is used to supply power to the control. The lithium battery power management module 2 is used to collect voltage and temperature signals and control the entire battery system. The charging relay K3 is used to control the opening and closing of charging. The present invention is also equipped with conventional main circuit fuses F1, low-voltage power supply fuses F2, shunt FL, diodes D1 and D2. Among them, the main circuit fuse F1 is electrically connected to the lithium battery pack 1 and the low-voltage power supply fuse F2 respectively. The low-voltage power supply fuse F2 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery external output control module 3, and the lithium battery charging control module 4 respectively. The shunt FL is electrically connected to the lithium battery pack 1, the DC-interface, and the lithium battery power management module 2 respectively. The diode D1 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery power management module 2, and the diode D2 respectively. The diode D2 is electrically connected to the lithium battery power management module 2, the additional power supply 12V positive interface, and the additional power supply 12V negative interface respectively. The low-voltage power supply fuse F2 can increase the safety of the low-voltage power supply. The main circuit fuse F1 can increase the safety of the entire battery system. The diodes D1 and D2 prevent reverse current from occurring when the lithium battery power management module 2 is powered by two methods, increasing the diversity of power supply.

[0045] A power-on and power-off method for the battery system as described above, including

[0046] Discharge power-on: The linkage switch K8 is turned to the right position. At this time, the external power-on and power-off switch K5 is closed, the external power-on and power-off switch K4 remains in its original state. After the external power-on and power-off switch K5 is closed, the controllable voltage conversion power supply DC / DC1 is powered on, driving the hold relay K6 to close. After 2 seconds, release the linkage switch K8 and return to the middle position. The external power-on and power-off switch K5 returns to its original state. The hold relay K6 and the external power-on and power-off switch K4 are turned on. The positive pole of the lithium battery pack passes through the hold relay K6 and the external power-on and power-off switch K4 to activate the controllable voltage conversion power supply DC / DC1 and supply power to the lithium battery power management module 2;

[0047] There are two modes for discharge power-off,

[0048] Discharge power-down mode 1: The linkage switch K8 is turned to the left gear, disconnecting the external power-on / off switch K4 and the external power-on / off switch K5 as well. At this time, the DCDC is in an inactive state, and the power supply of the lithium battery power management module 2 is cut off to achieve power-down.

[0049] Discharge power-down mode 2: When the lithium battery power management module 2 detects that the static current continuously remains at 5A, after a period of time, the hold relay K6 is cut off, preferably after one hour. At this time, the external power-on / off switch K5 is in the off state, and both power supply circuits are disconnected.

[0050] There are two charging and power-on modes.

[0051] Charging and power-on mode 1: The whole vehicle sends a message through the vehicle message to inform the lithium battery power management module 2 to power on, and the lithium battery power management module 2 immediately closes the charging relay K3.

[0052] Charging and power-on mode 2: Press the fast charge switch K7. When the lithium battery power management module 2 senses the rising edge of the fast charge switch K7 through the CC2 interface, it closes the charging relay K3.

[0053] Charging power-down mode 1: A power-down command message is transmitted from the vehicle CAN.

[0054] Charging power-down mode 2: By cutting off the external power-on / off switch K4, or when the output current to the outside is less than a certain current value within a certain period of time, the hold relay K6 is disconnected.

[0055] As an optimization: The "certain period of time" in the discharge power-down mode 2 is 1 - 12 hours, preferably 2 hours; the "certain current value" in the charging power-down mode 2 is 2 - 5A, preferably 5A.

[0056] In the above method, the configuration of the fast charging resistor R2 can make the CC2 detection port of the lithium battery power management module 2 feel the same 10k resistor after being connected to the national standard. The power supply at the CC2 detection port passes through a resistor and a switch and is connected to the negative electrode. A current can be generated at the CC2 detection port, and the lithium battery power management module 2 signals that this current signal is a high level. The 12V+ interface and 12V- interface of the lithium battery communication debugging interface module 6 can supply power to the internal lithium battery power management module 2 through this port in case of battery over-discharge, etc. When powering, due to the function of the diode D1 and the diode D2, the current flows into the lithium battery power management module 2.

[0057] The advantages of the present invention are:

[0058] 1) Two switches, namely the power-on / off switch K4 and the power-on / off switch K5, are provided to meet the usage characteristics of the AGV. These two switches are linked through the linkage switch K8, which is a self-resetting switch that can automatically reset. After power-on, it maintains the original switch state without being turned off, and can also implement two methods of manual power-off and automatic power-off, meeting the diverse usage needs of users;

[0059] 2) It has two charging methods, namely the message method and the strong charge switch method, realizing two methods of manual charging and automatic charging, meeting the diverse usage needs of users;

[0060] 3) The strong charge switch actuates when the battery is slightly over-discharged, enabling charging and power-on, and increasing the maintainability of the battery;

[0061] 4) A strong charging resistor R2 is provided to reduce the current at the detection port and increase the safety of the lithium battery power management module;

[0062] 5) A pre-charge circuit is provided to reduce the impact on the discharge relay K1 and extend the service life of the battery;

[0063] 6) An additional power supply 12V positive interface and an additional power supply 12V negative interface are provided to diversify the power supply sources and make it more convenient to use;

[0064] 7) A controllable voltage conversion power supply DC / DC1 is provided to reduce the activation current, weaken the impact on the key switch, and extend the service life of the key switch.

[0065] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 invention.

Claims

1. A power battery system for a new type of AGV, characterized in that It includes a lithium battery pack for power supply, a lithium battery power management module for controlling and managing the battery system, a lithium battery external output control module for realizing the external output of the battery system, a lithium battery charging control module for controlling the charging operation of the battery system, a lithium battery fast charging control module for realizing the fast charging function of the battery system, a lithium battery communication debugging interface module for providing communication debugging functions, and a lithium battery power-on / off control module for realizing the power-on and power-off of the battery system. Among them, the lithium battery pack is electrically connected to the lithium battery power management module, the lithium battery external output control module, and the lithium battery charging control module respectively, and the lithium battery power management module is electrically connected to the lithium battery charging control module, the lithium battery fast charging control module, the lithium battery communication debugging interface module, and the lithium battery power-on / off control module respectively; The lithium battery fast charging control module includes a fast charging resistor R2 and a fast charging switch K7; The lithium battery power-on / off control module includes an external power-on / off switch K4, an external power-on / off switch K5, a holding relay K6, and a controllable voltage conversion power supply DC / DC1. The external power-on / off switch K5 is a normally open switch, and the power-on / off switch K4 is a normally closed switch. The external power-on / off switch K4 and the external power-on / off switch K5 are connected through a set linkage switch K8. The linkage switch K8 has three positions: left, middle, and right. When it is turned to the left position, both the external power-on / off switch K5 and the external power-on / off switch K4 are disconnected; when it is turned to the middle position, the external power-on / off switch K4 is closed and the external power-on / off switch K5 is disconnected; when it is turned to the right position, both the external power-on / off switch K4 and the external power-on / off switch K5 are closed; The lithium battery communication debugging interface module includes an additional power supply 12V positive interface, an additional power supply 12V negative interface, a vehicle interface, a vehicle debugging interface, and an intranet debugging interface; The power battery system further includes a main circuit fuse F1, a low-voltage power supply fuse F2, a diode D1, and a diode D2. Among them, the main circuit fuse F1 is electrically connected to the lithium battery pack 1 and the low-voltage power supply fuse F2 respectively, and the low-voltage power supply fuse F2 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery external output control module, and the lithium battery charging control module respectively. The diode D1 is electrically connected to the controllable voltage conversion power supply DC / DC1, the lithium battery power management module, and the diode D2 respectively, and the diode D2 is electrically connected to the lithium battery power management module, the additional power supply 12V positive interface, and the additional power supply 12V negative interface respectively; The lithium battery external output control module includes a pre-charge branch, a pre-charge relay K2, a total positive interface, and a total negative interface. Among them, the pre-charge branch includes a discharge relay K1 and a pre-charge resistor R1; The lithium battery charging control module includes a charging relay K3, a DC+ interface, and a DC- interface.

2. A novel power battery system for AGV according to claim 1, characterized in that After the linkage switch K8 is turned to the left or right position and then released, it can automatically reset.

3. A method for powering on and off a battery system as described in claim 1 or 2, characterized in that Include Discharge Power on: Switch the linkage switch K8 to the right position. At this time, the external power-on / off switch K5 is closed, the external power-on / off switch K4 remains in its original state. After the external power-on / off switch K5 is closed, the controllable voltage conversion power supply DC / DC1 is powered on, driving the holding relay K6 to close. Then release the linkage switch K8 and return it to the middle position. The external power-on / off switch K5 returns to its original state, and the holding relay K6 and the external power-on / off switch K4 are conducted. The positive pole of the lithium battery pack passes through the holding relay K6 and the external power-on / off switch K4 to activate the controllable voltage conversion power supply DC / DC1 and supply power to the lithium battery power management module; There are two modes for discharging and powering off, Discharging and powering off mode 1: Switch the linkage switch K8 to the left position to disconnect the external power-on / off switch K4 and the external power-on / off switch K5 as well. At this time, the controllable voltage conversion power supply DC / DC1 is in an inactive state, and the power supply of the lithium battery power management module is cut off to achieve power-off; Discharging and powering off mode 2: When the lithium battery power management module detects that the static current continuously remains at 5A, the holding relay K6 is cut off after a period of time. At this time, the external power-on / off switch K5 is in the off state, and both power supply circuits are disconnected; There are two modes for charging and powering on, Charging and powering on mode 1: The vehicle sends a message through the vehicle bus to inform the lithium battery power management module to power on, and the lithium battery power management module immediately closes the charging relay K3; Charging and powering on mode 2: Press the fast charge switch K7. When the lithium battery power management module senses the rising edge of the fast charge switch K7 through the CC2 interface, it closes the charging relay K3; Charging and powering off mode 1: A power-off instruction message is transmitted from the vehicle CAN; Charging and powering off mode 2: By cutting off the external power-on / off switch K4, or when the external output current is less than a certain current value within a certain period of time, the holding relay K6 is disconnected.

4. The power-on and power-off method of the battery system according to claim 3, characterized in that The "certain period of time" in the discharging and powering off mode 2 is 1 - 12 hours; the "certain current value" in the charging and powering off mode 2 is 2 - 5A.

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