A hard-switching power battery system for AGV and its power supply method

Abstract

The present invention belongs to the field of forklift batteries, and particularly relates to a new type of hard-switch power battery system for AGV and its power supply method, which includes 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, a lithium battery power-on control module, and a lithium battery power display 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, the lithium battery power-on control module, and the lithium battery power display module respectively. The lithium battery external output control module is electrically connected to the lithium battery charging control module. The present invention adopts a two-switch design, especially using a switch in the charging part, which increases the charging reliability.

Description

Technical Field

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

[0002] In the process of modernization and intelligentization, AGV has been increasingly applied. Using lithium batteries to power AGV also improves the performance of AGV in terms of cycle life and environmental protection. The problem is that the traditional AGV battery system only has an automatic charging mode, which is not flexible enough to use and its functions are not perfect. 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 hard-switch power battery system for AGV and its power supply method.

[0004] The described hard-switch power battery system for AGV is characterized by 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, a lithium battery power-on control module, and a lithium battery power display 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, the lithium battery power-on control module, and the lithium battery power display module respectively. The lithium battery external output control module is electrically connected to the lithium battery charging control module.

[0005] The described hard-switch power battery system for AGV is characterized in that the lithium battery external output module includes a discharge relay K1, a pre-charge circuit, a discharge positive interface, and a discharge negative interface.

[0006] The described hard-switch power battery system for AGV is characterized in that the pre-charge circuit includes a pre-charge resistor RI and a pre-charge relay K2.

[0007] The described hard-switch power battery system for AGV is characterized in that the lithium battery charging control module includes a charging switch K5, a charging relay K3, a charging positive interface, and a charging negative interface.

[0008] The described hard-switch power battery system for AGV is characterized in that the lithium battery fast charging control module includes a fast charge resistor R2 and a fast charge switch K6.

[0009] The described hard-switch power battery system for AGV is characterized in that the lithium battery power-on control module includes a power-on / off switch K4 and a controllable voltage conversion power supply DCDC1.

[0010] The described hard-switch power battery system for AGV is characterized in that the lithium battery power display module includes several power indicators.

[0011] A power supply method for the charging system as described above is characterized by including

[0012] Discharge power-on: Turn on the power-on / off switch K4 to activate the controllable voltage conversion power supply DCDC1 and activate the KEY ON pin of the lithium battery power management module. The lithium battery power management module is activated through KEY ON and powered by POWER+ and POWER-. The power-on is successful. The controllable voltage conversion power supply DC / DC1 is an isolated DC power supply that can isolate the high-voltage power supply from the low-voltage power supply. During the power-on process, the lithium battery power management module is activated. After the initialization is completed, the pre-charge relay K2 is closed for pre-charging. Then, the discharge relay K1 is closed, and the pre-charge relay K2 is disconnected. The power-on is completed.

[0013] Discharge power-off: Disconnect the power-on / off switch K4 to achieve power-off.

[0014] Charge power-on: There are two modes for charge power-on.

[0015] Charge power-on mode 1: During the power-on process, after closing the charge switch K5, the power of POWER+ is conducted to the A+ pin. When the lithium battery power management module recognizes the signal of the A+ pin, the charge relay K3 is closed. At this time, the discharge relay K1 remains closed to maintain the power supply of the whole vehicle. If the charge switch K5 is clicked and disconnected again, the charge relay K3 will disconnect after the A+ pin signal disappears.

[0016] Charge power-on 2: During the power-on process, press the strong charge switch K6. When the lithium battery power management module senses the rising edge of the strong charge switch K6 through the CC2 interface, the charge relay K3 is closed.

[0017] Charge power-off: There are two modes for charge power-off.

[0018] Charge power-off mode 1: Disconnect the charge switch K5.

[0019] Charge power-off mode 2: When the battery is charging, it is first in the constant current mode. When it is charged to the set voltage value, it switches to the constant voltage mode. When the current drops to 0.15C or the single-cell voltage is charged to 3.65V in the constant voltage mode, the discharge relay K1 is disconnected.

[0020] Compared with the prior art, the present invention can solve the problem of lithium battery adaptation for high-altitude operation scissor lifts and has the following advantages:

[0021] 1) The present invention adopts a two-switch design, especially using a switch for the charging part, which increases the charging reliability.

[0022] 2) The present invention has two charging methods: switch charging and fast charging switch K6, which increases the diversity of charging operations;

[0023] 3) The fast charging switch K6 of the present invention actuates when the battery is slightly over-discharged, enabling charging and power-on, which increases the maintainability of the battery;

[0024] 4) A fast charging resistor R2 is provided to reduce the current at the detection port, which increases the safety of the lithium battery power management module;

[0025] 5) The configuration of the power indicator is used to display the battery power, which increases the display function of the battery and improves convenience;

[0026] 6) An isolated controllable voltage conversion power supply DC / DC1 is used, which increases the safety of the lithium battery power management module and prevents large current impacts;

[0027] 7) The entire battery system operates in a normal temperature environment without thermal management costs such as heating, which increases economy;

[0028] 8) A+ pin and power+, KEY ON combination are used for charging and discharging respectively, which increases the anti-error property of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the battery system of the present invention;

[0030] Figure 2 is a schematic circuit diagram of the battery system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] 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. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 of the present invention.

[0032] The present invention will be further described below with reference to the drawings.

[0033] As Figure 1 、 2As shown in the figure, a hard-switch power battery system for an AGV includes a lithium battery pack 1, a lithium battery power management module 2, a lithium battery external output control module 3, a lithium battery charging control module 4, a lithium battery fast charging control module 5, a lithium battery communication debugging interface module 6, a lithium battery power-on control module 7, and a lithium battery power display module 8. 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. The lithium battery power management module 2 is electrically connected to the lithium battery charging control module 4, the lithium battery fast charging control module 5, the lithium battery communication debugging interface module 6, the lithium battery power-on control module 7, and the lithium battery power display module 8 respectively. The lithium battery external output control module 3 is electrically connected to the lithium battery charging control module 4.

[0034] As an optimization: The lithium battery external output module 3 includes a discharge relay K1, a pre-charge circuit, a discharge positive interface, and a discharge negative interface. Among them, the pre-charge circuit includes a pre-charge resistor RI and a pre-charge relay K2.

[0035] As an optimization: The lithium battery charging control module 4 includes a charging switch K5, a charging relay K3, a charging positive interface, and a charging negative interface.

[0036] As an optimization: The lithium battery fast charging control module 5 includes a fast charging resistor R2 and a fast charging switch K6.

[0037] As an optimization: The lithium battery power-on control module 7 includes a power-on / off switch K4 and a controllable voltage conversion power supply DCDC1.

[0038] As an optimization: The lithium battery power display module 8 includes power indicator lights L1, L2, L3, and L4.

[0039] A further description of the battery system of the present invention: The lithium battery pack 1 includes a battery B1. The present invention takes a module composed of 16 series-connected lithium iron phosphate batteries as an example, and the number and capacity can be increased or decreased. The discharge relay K1 is used to control the opening and closing of the external output of the battery B1. The pre-charge resistor K2 and the pre-charge relay R1 form a pre-charge branch to perform pre-charging before power-on to avoid impact on the discharge relay K1 caused by external capacitive loads. The power-on / off switch K4 is normally open and self-locking. The charging switch K5 is normally open and self-locking. 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 power indicator lights L1-L4 are used to display the corresponding power levels. The battery system of the present invention also includes conventional accessories in the battery system: a main circuit fuse F1 and a shunt FQ1. The shunt FQ1 is used to collect the main circuit current.

[0040] A power supply method for the charging system as described above, including

[0041] Discharge power-on: Turn on the power-on / off switch K4 to activate the controllable voltage conversion power supply DCDC1 and activate the KEY ON pin of the lithium battery power management module 2. The lithium battery power management module 2 is activated through KEY ON and powered by POWER+ and POWER-. The power-on is successful. The controllable voltage conversion power supply DC / DC1 is an isolated DC power supply that can isolate the high-voltage power supply from the low-voltage power supply, avoiding interference with the power supply of the lithium battery power management module 2 due to the battery current fluctuation in the main power part. During the power-on process, the lithium battery power management module 2 is activated. After initialization is completed, the pre-charge relay K2 is closed for pre-charging. After 500 ms, the discharge relay K1 is closed, and then K2 is disconnected after another 500 ms. The power-on is completed.

[0042] Discharge power-off: Disconnect the power-on / off switch K4 to achieve power-off.

[0043] Charge power-on: There are two modes for charge power-on.

[0044] Charge power-on mode 1: During the power-on process, after closing the charging switch K5, the power of POWER+ is conducted to the A+ pin. When the lithium battery power management module 2 recognizes the A+ pin signal, the charging relay K3 is closed. At this time, the discharge relay K1 remains closed to maintain the power supply of the whole vehicle. If the charging switch K5 is clicked and disconnected again, the charging relay K3 will be disconnected after the A+ pin signal disappears.

[0045] Charge power-on mode 2: During the power-on process, press the fast charge switch K6. When the lithium battery power management module 2 senses the rising edge of the fast charge switch K6 through the CC2 interface, the charging relay K3 is closed.

[0046] Charge power-off: There are two modes for charge power-off.

[0047] Charge power-off mode 1: Disconnect the charging switch K5.

[0048] Charge power-off mode 2: Normal stop when fully charged. When the battery is charging, it is first in the constant current mode. When it is charged to the set voltage value, it switches to the constant voltage mode. When the current drops to 0.15C or the single-cell voltage is charged to 3.65V in the constant voltage mode, the discharge relay K1 is disconnected.

[0049] The above-mentioned lithium battery power management module 2 is also called the lithium battery power management system. The above-mentioned KEY ON pin, POWER+, POWER-, A+ pin, and CC2 interface are all conventional structures of the lithium battery power management module 2.

[0050] The present invention has the following advantages:

[0051] 1) The present invention adopts a two-switch design, especially using a switch in the charging part, which increases the charging reliability;

[0052] 2) The present invention has two charging methods: switch charging and strong charging switch K6, which increases the diversity of charging operation;

[0053] 3) The strong charging switch K6 of the present invention jogs when the battery is slightly over-discharged, which can realize charging and power-on, and increases the maintainability of the battery;

[0054] 4) A strong charging resistor R2 is set to reduce the current at the detection port, which increases the safety of the lithium battery power management module;

[0055] 5) The configuration of the battery level indicator is used to display the battery level, which increases the display function of the battery and improves the convenience;

[0056] 6) An isolated controllable voltage conversion power supply DC / DC1 is used to increase the safety of the lithium battery power management module and prevent large current impact;

[0057] 7) The entire battery system operates in a normal temperature environment without thermal management costs such as heating, which increases the economy;

[0058] 8) A shunt is used for current acquisition instead of other high-cost solutions, which increases the economy of the system;

[0059] 9) The A+ pin and power+, KEY ON combination are used for charging and discharging respectively, which increases the anti-error property of the system.

[0060] 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 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 hard-switching power battery system for AGV, characterized in that It includes 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, a lithium battery power-on control module, and a lithium battery power display 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, the lithium battery power-on control module, and the lithium battery power display module respectively. The lithium battery external output control module is electrically connected to the lithium battery charging control module; The power supply method of the hard-switch power battery system includes Discharge power-on: Turn on the power-on / off switch K4 to activate the controllable voltage conversion power supply DCDC1 and activate the KEY ON pin of the lithium battery power management module. The lithium battery power management module is activated through KEY ON and powered by POWER+ and POWER-. The power-on is successful. The controllable voltage conversion power supply DC / DC1 is an isolated DC power supply that can isolate the high-voltage power supply from the low-voltage power supply. During the power-on process, the lithium battery power management module is activated. After the initialization is completed, the pre-charge relay K2 is closed for pre-charging, and then the discharge relay K1 is closed, and then the pre-charge relay K2 is disconnected. The power-on is completed; Discharge power-off: Disconnect the power-on / off switch K4 to achieve power-off; Charge power-on: There are two modes for charge power-on, Charge power-on mode 1: During the power-on process, after closing the charge switch K5, the power of POWER+ is conducted to the A+ pin. When the lithium battery power management module recognizes the signal of the A+ pin, it closes the charge relay K3. At this time, the discharge relay K1 remains closed to maintain the power supply of the whole vehicle. If the charge switch K5 is clicked and disconnected again, the charge relay K3 will be disconnected after the A+ pin disappears; Charge power-on mode 2: During the power-on process, press the fast charge switch K6. When the lithium battery power management module senses the rising edge of the fast charge switch K6 through the CC2 interface, it closes the charge relay K3; Charge power-off: There are two modes for charge power-off, Charge power-off mode 1: Disconnect the charge switch K5; Charge power-off mode 2: When the battery is charging, it is first in the constant current mode. When it is charged to the set voltage value, it switches to the constant voltage mode. When the current drops to 0.15C or the single-cell voltage is charged to 3.65V in the constant voltage mode, the discharge relay K1 is disconnected; The power-on / off switch K4 is electrically connected to the lithium battery pack and the controllable voltage conversion power supply DC / DC1 respectively. The controllable voltage conversion power supply DC / DC1 is electrically connected to POWER+ and POWER- of the lithium battery power management module. The lithium battery power management module is also electrically connected to the charge switch K5, the fast charge switch K6, the discharge relay K1, the pre-charge relay K2, and the charge relay K3 respectively.

2. The hard-switch power battery system for AGV according to claim 1, characterized in that The lithium battery external output control module includes a discharge relay K1, a pre-charge circuit, a discharge positive interface, and a discharge negative interface.

3. The hard-switch power battery system for AGV according to claim 2, wherein The pre-charge circuit includes a pre-charge resistor RI and a pre-charge relay K2.

4. The hard-switch power battery system for an AGV according to claim 1, wherein The lithium battery charging control module includes a charging switch K5, a charging relay K3, a charging positive interface, and a charging negative interface.

5. The hard-switch power battery system for an AGV according to claim 1, wherein The lithium battery fast charging control module includes a fast charging resistor R2 and a fast charging switch K6.

6. The hard-switch power battery system for AGV according to claim 1, characterized in that The lithium battery power-on control module includes a power-on / off switch K4 and a controllable voltage conversion power supply DCDC1.

7. An AGV hard-switch power battery system according to any one of claims 1-6, characterized in that The lithium battery power display module includes several power indicator lights.

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