A new type of battery system for an articulated vehicle and its power supply method

Abstract

The present invention belongs to the field of forklift batteries, and particularly relates to a new battery system for articulated vehicles and its power supply method, which includes a lithium battery heating circuit, a lithium battery pack, a lithium battery external output control module, a lithium battery charging control module, a lithium battery power management module, a power control circuit controlled by a self-resetting switch, a lithium battery communication debugging interface, and a lithium battery external power supply module. The battery system and power supply method of the present invention not only achieve the smooth power-on and power-off of the lithium battery as a power battery source, but also solve the problem that the battery cannot be powered on due to the power feed of the external lead-acid battery after long-term storage.

Description

Technical Field

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

[0002] Due to the advantages of long cycle life and light weight of lithium battery systems, more and more non-road vehicles use lithium battery systems. Existing lithium batteries have the problem that the battery cannot be powered on after being placed for a long time due to the power feed of the external lead-acid battery. 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 battery system for articulated vehicles and its power supply method.

[0004] The new battery system for articulated vehicles, characterized by comprising a lithium battery heating circuit, a lithium battery pack, a lithium battery external output control module, a lithium battery charging control module, a lithium battery power management module, a power control circuit controlled by a self-resetting switch, 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 circuit, the lithium battery external output control module, the lithium battery charging control module, and the lithium battery power management module respectively. The lithium battery external output control module is electrically connected to the lithium battery charging control module. The lithium battery power management module is electrically connected to the power control circuit controlled by the self-resetting switch, the lithium battery communication debugging interface, the lithium battery external power supply module, and the lithium battery charging control module respectively.

[0005] The new battery system for articulated vehicles, characterized in that the lithium battery heating circuit includes a heating film, a heating positive relay K2, and a heating negative relay K5.

[0006] The new battery system for articulated vehicles, characterized in that the lithium battery external output control module includes a discharge relay K4, a pre-charge relay K3, and a pre-charge resistor R1.

[0007] The new battery system for articulated vehicles, characterized in that the lithium battery charging control module includes a charging relay K6.

[0008] The new battery system for articulated vehicles, characterized in that the power control circuit controlled by the self-resetting switch includes a self-resetting switch K7, a controllable backup power supply DC-DC1, and a holding relay K1.

[0009] The new battery system for articulated vehicles, characterized in that the lithium battery external power supply module includes a vehicle power supply interface and a charging power supply interface, each having a diode, and the diode is used to prevent mutual power feeding when the vehicle is running normally.

[0010] A power supply method for the battery system as described above, characterized in that the power supply method has two modes:

[0011] Power supply mode 1: Connect to an external power supply through the vehicle power supply interface of the external power supply module of the lithium battery, and be powered by the external power supply. This power supply is used for the normal operation of the vehicle.

[0012] Power supply mode 2: In the case of no external power supply, connect to the lithium battery power management module through a self-resetting switch to supply power. After the lithium battery power management module is powered, its drive output pin will keep the relay closed. After the self-resetting switch is disconnected, the relay remains closed to keep supplying power to the lithium battery power management module.

[0013] In the power supply method described above, in power supply mode 2, the lithium battery power management module is powered through the KEYON pin activated by the lithium battery power management module.

[0014] Compared with the prior art, the battery system and power supply method of the present invention not only achieve the smooth power on and off of the lithium battery as a power battery source, but also solve the problem that the battery cannot be powered on due to the power failure of the external lead-acid battery after a long-term placement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the circuit structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end portion", "length", "outer end", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 therefore should not be construed as a limitation of the present invention.

[0018] The present invention will be further described below with reference to the drawings.

[0019] As Figure 1 , 2As shown in the figure, a new type of battery system for an articulated vehicle includes a lithium battery heating circuit 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 power control circuit 6 controlled by a self-resetting switch, 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 circuit 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 external output control module 3 is electrically connected to the lithium battery charging control module 4. The lithium battery power management module 5 is electrically connected to the power control circuit 6 controlled by the self-resetting switch, the lithium battery communication debugging interface 7, the lithium battery external power supply module 8, and the lithium battery charging control module 4 respectively. Among them, the lithium battery power management module 5 is the battery management system (BMS).

[0020] Further, the lithium battery heating circuit 1 includes a heating film, a heating positive relay K2, and a heating negative relay K5. The heating film includes a first heating film H1 and a second heating film H2.

[0021] Further, the lithium battery external output control module 3 includes a discharge relay K4, a pre-charge relay K3, and a pre-charge resistor R1.

[0022] Further, the lithium battery charging control module 4 includes a charging relay K6.

[0023] Further, the power control circuit 6 controlled by the self-resetting switch includes a self-resetting switch K7, a controllable backup power supply DC-DC1, and a holding relay K1.

[0024] Further, the lithium battery external power supply module 8 includes a vehicle power supply interface and a charging power supply interface, each of which has a diode. The diode is used to prevent cross-electrification when the vehicle is running normally, ensuring stable operation between them.

[0025] Taking the module composed of 2 parallel and 25 series-connected lithium iron phosphate batteries in the present invention as an example, the number and capacity can be increased or decreased. The first heating film H1 and the second heating film H2 are resistive loads used to heat the battery module so that the present invention can be applicable to a wider temperature range. The heating positive relay K2 and the heating negative relay K5 are used to control the opening and closing of the heating film. At the same time, the discharge relay K4 is used to control the opening and closing of the external output of the battery module. The charging relay K6 is used to control the start and stop of charging. The pre-charge relay K3 and the pre-charge resistor R1 form a pre-charge branch to protect the discharge relay K6 accordingly. The self-resetting switch K7 and the holding relay K1 are connected in parallel to jointly control the opening and closing of the controllable backup power supply DC-DC1.

[0026] A power supply method for the battery system as described above, and the power supply method has two modes:

[0027] Power supply mode 1: Through the lithium battery external power supply module 8, the two vehicle power supply interfaces of vehicle 12V+ and vehicle 12V- are connected to an external power supply, and the external power supply supplies power. This external power supply is an external small battery, and this power supply is used for the normal operation of the vehicle and is connected to the A+ interface of the BMS integrated machine;

[0028] Power supply mode 2: In the case of no external power supply, the self-resetting switch K7 is turned on to supply power to the lithium battery power management module 5. After the lithium battery power management module 5 is powered, its drive output pin will keep the relay K1 closed. After the self-resetting switch K7 is turned off, the relay K1 remains closed to keep supplying power to the lithium battery power management module 5. Among them, this power supply method supplies power to the lithium battery power management module 5 through the KEYON pin activated by the lithium battery power management module 5. In the case where the vehicle is placed for a period of time, if the external lead-acid small battery is powered off and the lithium battery power management module 5 cannot be activated, the self-resetting switch K7 is used to temporarily activate the battery module so that the vehicle can be used normally without having to recharge the external small battery before use.

[0029] The pins of the above two power supply modes are separated for function differentiation. The relay K1 is kept closed only when there is a KEYON pin, so that it can be used precisely.

[0030] There are two modes when charging, with the key on and the key off. When the key is off, the auxiliary power supply of the external charger is used to activate the A+ pin of the lithium battery power management module 5 from the two power supply ports of CHG-A+ and CHG-A-. At the same time, when the CC2 interface is detected, it enters the charging mode and then performs corresponding charging configuration; when charging with the key on, there is a power supply signal at A+. At this time, when the CC2 interface and the charging message are detected, it is considered to be in the charging mode and corresponding charging configuration is performed.

[0031] The advantages of the present invention are as follows:

[0032] 1) The two vehicle operation power supply methods can be used as a backup when the external small power supply is powered off, providing diversity in vehicle power supply;

[0033] 2) In power supply mode 2 of the present invention, the self-resetting switch K7 is used instead of the self-locking switch, so that it can be no longer operated after the user uses it once, which is more intelligent;

[0034] 3) The present invention uses a diode respectively at the vehicle power supply interface and the charging power supply interface to increase the operating stability of the system;

[0035] 5) The present invention has two modes: power supply for the whole vehicle during operation and power supply during charging operation, but they can be distinguished through messages and CC2 signals, increasing the identifiability and diversity of the application of the lithium battery power management module 5;

[0036] 6) In the present invention, the PE line of the lithium battery power management module 5 is connected to the box body, and the PE terminal of the external charging line is also connected to the object to achieve equal potential taking for charging, increasing the reliability of charging operation;

[0037] 7) The PE line is also led out from the lithium battery communication debugging interface 7 of the present invention. During testing, equal potential can be formed with the inside through the external communication interface and this PE line, increasing the possibility of external testing;

[0038] 8) Each debugging port is led out, increasing the maintainability;

[0039] 9) The temperature points of the charging communication port share the same ground, saving plug-in points and increasing the convenience of inheritance.

[0040] 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 new type of battery system for an articulated vehicle, characterized in that It includes a lithium battery heating circuit, a lithium battery pack, a lithium battery external output control module, a lithium battery charging control module, a lithium battery power management module, a power control circuit controlled by a self-resetting switch, 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 circuit, the lithium battery external output control module, the lithium battery charging control module, and the lithium battery power management module respectively. The lithium battery external output control module is electrically connected to the lithium battery charging control module. The lithium battery power management module is electrically connected to the power control circuit controlled by the self-resetting switch, the lithium battery communication debugging interface, the lithium battery external power supply module, and the lithium battery charging control module respectively; The lithium battery heating circuit includes a heating film, a heating positive relay K2, and a heating negative relay K5; The lithium battery external output control module includes a discharge relay K4, a pre-charge relay K3, and a pre-charge resistor R1; The lithium battery charging control module includes a charging relay K6; The power control circuit controlled by the self-resetting switch includes a self-resetting switch K7, a controllable standby power supply DC-DC1, and a holding relay K1; The lithium battery external power supply module includes a vehicle power supply interface and a charging power supply interface, each having a diode, and the diode is used to prevent cross-electrification when the vehicle is running normally.

2. A power supply method for a battery system as claimed in claim 1, characterized in that There are two modes of the power supply method: Power supply mode 1: Connect to an external power supply through the vehicle power supply interface of the lithium battery external power supply module, and be powered by the external power supply. This power supply is used for the normal operation of the vehicle; Power supply mode 2: In the case of no external power supply, power the lithium battery power management module by turning on the self-resetting switch. After the lithium battery power management module is powered, its drive output pin closes the holding relay. After the self-resetting switch is turned off, the holding relay remains closed to keep powering the lithium battery power management module.

3. The power supply method according to claim 2, wherein In the power supply mode 2, power the lithium battery power management module through the KEYON pin activated by the lithium battery power management module.

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