A lead-acid to lithium battery conversion system with the same charging and discharging port and its power-on and power-off method

Abstract

The present invention belongs to the field of forklift batteries, and particularly relates to a lithium lead-acid battery replacement system with the same charging and discharging port and its power-on and power-off method, including a lithium battery thermal management module, a lithium battery pack, a lithium battery power management module, a lithium battery external output and charging control module, a lithium battery power-on and hold control module, a lithium battery power-off control module, and a lithium battery fault and information display module. The same charging and discharging port of the present invention not only realizes the purpose of replacing lead-acid batteries, but also realizes functions such as power-on, power-off, and charging of lithium batteries, meeting the usage requirements and improving economy.

Description

Technical Field

[0001] The present invention belongs to the field of forklift batteries, and particularly relates to a lead-acid to lithium battery system with the same charging and discharging port and its power-on and power-off method. Background Art

[0002] In the past, non-road vehicles generally used lead-acid batteries. Later, 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. Also, since the circuit framework of existing lead-acid batteries is very mature, if the lead-acid battery can be replaced with a lithium battery while retaining the original lead-acid battery circuit framework, many costs will be saved. Therefore, how to replace the lead-acid battery with a lithium battery and achieve power-on and power-off without changing the interface under the original circuit framework of the lead-acid battery is an urgent problem to be solved.

[0003] This application proposes a new solution for lead-acid to lithium battery conversion with the same charging and discharging port, which not only solves the problem of normal power-on and power-off of lithium batteries, but also makes it possible to convert lead-acid to lithium in the market. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a technical solution for a lead-acid to lithium battery system with the same charging and discharging port and its power-on and power-off method.

[0005] The described lead-acid to lithium battery system with the same charging and discharging port is characterized by including a lithium battery thermal management module for thermal management of the lithium battery system, a lithium battery pack for power supply, a lithium battery power management module for control management of the lithium battery system, a lithium battery external output and charging control module for realizing the external output and charging control of the lithium battery system, a lithium battery power-on and hold control module for realizing the power-on of the lithium battery, a lithium battery power-off control module for realizing the power-off of the lithium battery, and a lithium battery fault and information display module for displaying the working state of the lithium battery system. Among them, the lithium battery thermal management module is electrically connected to the lithium battery pack, the lithium battery pack is respectively electrically connected to the lithium battery power management module and the lithium battery external output and charging control module, and the lithium battery power management module is respectively electrically connected to the lithium battery external output and charging control module, the lithium battery power-on and hold control module, the lithium battery power-off control module, and the lithium battery fault and information display module.

[0006] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the lithium battery thermal management module includes a heating film assembly, a heating positive relay K2, and a heating negative relay K5.

[0007] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the external output and charging control module of the lithium battery includes a pre-charge branch, a charge and discharge relay K4, a DC+ interface, a DC- interface, an A+ interface, an A- interface, a CAN2H interface, and a CAN2L interface.

[0008] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the pre-charge branch includes a pre-charge relay K3 and a pre-charge resistor R1.

[0009] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the power-on and hold control module of the lithium battery includes a self-resetting start switch K7, a start relay K1, and a controllable voltage conversion power supply DC-DC1.

[0010] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the power-off control module of the lithium battery includes a stop switch K8.

[0011] The described lead-acid to lithium battery system with the same charging and discharging port is characterized in that the fault and information display module of the lithium battery includes a display screen and an audible and visual alarm.

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

[0013] Automatic discharge and power-on: By actuating the self-resetting start switch K7 to control the power-on of the controllable voltage conversion power supply DC-DC1, power is supplied to the lithium battery power management module. After the lithium battery power management module obtains power supply, it drives the output pin to close the start relay K1;

[0014] Manual discharge and power-off: It is achieved by turning off the stop switch K8;

[0015] Automatic discharge and power-off: When the lithium battery power management module detects that the static current continuously remains at X, the range of X is 2 - 15A, and after Y hours, the hold relay K6 is cut off, where Y is 0.5 - 6 hours;

[0016] Power-on during charging when the key is off: The auxiliary power supply of the external charger activates the A+ pin of the lithium battery power management module from the two power supply interfaces CHG-A+ and CHG-A-. At the same time, when the lithium battery power management module detects the charging message sent by the external charger, it enters the charging mode and performs corresponding charging configuration;

[0017] Power-on during charging when the key is off: When the lithium battery power management module detects a power supply signal on the A+ pin, and at this time, when it detects the heartbeat message and the charging message, it is considered to be in the charging mode. After performing the corresponding charging configuration, the charge and discharge relay K4 is closed. After the external charger detects a voltage output, it closes the external charger switch and performs corresponding charging output.

[0018] The power-on and power-off method described above is characterized in that X in the automatic discharge power-off is 5 A and Y is 0.5 hours.

[0019] The advantages of the present invention are as follows:

[0020] 1) The charging and discharging share the same port, which not only realizes the purpose of replacing lead-acid batteries but also realizes functions such as power-on, power-off, and charging of lithium batteries, meeting the usage requirements and improving economy.

[0021] 2) Powering on by resetting the start switch K7 can meet the user's usage habits and can power on the lithium battery, providing wide application scope for the lithium battery.

[0022] 3) The stop switch K8 is used to turn off in case of an emergency, increasing the system safety.

[0023] 4) It is also possible to charge with the key on, increasing the system intelligence.

[0024] 5) Charging with communication increases the battery life and provides the performance of lithium battery cells.

[0025] 6) The sound and light alarm can remind the user of a failure and increase safety in the outdoor environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic structural diagram of a lithium battery replacement system with the same charging and discharging port for lead-acid batteries according to the present invention;

[0027] Figure 2 FIG. is a schematic circuit relationship diagram of a lithium battery replacement system with the same charging and discharging port for lead-acid batteries according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] 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.

[0029] The present invention will be further described below with reference to the drawings.

[0030] As Figure 1 、 2As shown in the figure, a lead-acid to lithium battery system with the same charging and discharging port includes a lithium battery thermal management module 1 for thermal management of the lithium battery system, a lithium battery pack 2 for power supply, a lithium battery power management module 3 for control and management of the lithium battery system, a lithium battery external output and charging control module 4 for realizing the external output and charging control of the lithium battery system, a lithium battery power-on and hold control module 5 for realizing the power-on of the lithium battery, a lithium battery power-off control module 6 for realizing the power-off of the lithium battery, and a lithium battery fault and information display module 7 for displaying the working state of the lithium battery system. Among them, the lithium battery thermal management module 1 is electrically connected to the lithium battery pack 2, the lithium battery pack 2 is respectively electrically connected to the lithium battery power management module 3 and the lithium battery external output and charging control module 4, and the lithium battery power management module 3 is respectively electrically connected to the lithium battery external output and charging control module 4, the lithium battery power-on and hold control module 5, the lithium battery power-off control module 6, and the lithium battery fault and information display module 7.

[0031] As an optimization: The lithium battery thermal management module 1 includes a heating film assembly, a heating positive relay K2, and a heating negative relay K5.

[0032] As an optimization: The lithium battery external output and charging control module 4 includes a pre-charge branch, a charge and discharge relay K4, a DC+ interface, a DC- interface, an A+ interface, an A- interface, a CAN2H interface, and a CAN2L interface. Among them, the pre-charge branch includes a pre-charge relay K3 and a pre-charge resistor R1. Among them, the CAN2H interface and the CAN2L interface are charging CAN communication interfaces, and the A+ interface and the A- interface are charging low-voltage power supply interfaces.

[0033] As an optimization: The lithium battery power-on and hold control module 5 includes a self-resetting start switch K7, a start relay K1, and a controllable voltage conversion power supply DC-DC1.

[0034] As an optimization: The lithium battery power-off control module 6 includes a stop switch K8.

[0035] As an optimization: The lithium battery fault and information display module 7 includes a display screen 700 and an audible and visual alarm 701. The display screen is a 485 display screen, which mainly displays information such as current, power, single cell, and temperature.

[0036] Further description of the above lithium battery system: Taking a module composed of 2 parallel and 25 series-connected lithium iron phosphate batteries as an example, the number of parallel connections and capacity can be increased or decreased. The lithium battery pack 2 includes battery B1 and battery B2. The heating film assembly includes heating films H1 and H2, which are resistive loads and can generate heat to heat the 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 assembly. At the same time, the charge and discharge relay K4 is used to control the opening and closing of the battery's external output during discharge and the opening and closing of the charging branch during charging. The pre-charge branch protects the charge and discharge relay K4 during power-on of discharge. The self-resetting start switch K7 and the start relay K1 are connected in parallel to jointly control the opening and closing of the controllable voltage conversion power supply DC-DC1. After power-on is completed, turning off the stop switch K8 can cause the control terminal of the controllable voltage conversion power supply DC-DC1 to lose power, and the lithium battery power management module 3 stops external output. The controllable voltage conversion power supply DC-DC1 is used to supply power to the lithium battery power management module 3.

[0037] In addition, the lithium battery system of the present invention is also equipped with shunt FQ1, shunt FQ2, fuse F1 components. Since the structures and circuit connection methods of the shunt FQ1, shunt FQ2, and fuse F1 are all well-known technologies, they will not be elaborated here.

[0038] A power-on and power-off method for the lithium battery system as described above includes

[0039] Automatic discharge and power-on: Control the power-on of the controllable voltage conversion power supply DC-DC1 by momentarily pressing the self-resetting start switch K7 to supply power to the lithium battery power management module 3. After the lithium battery power management module 3 obtains power supply, it drives the output pin to close the start relay K1;

[0040] Manual discharge and power-off: Achieved by turning off the stop switch K8;

[0041] Automatic discharge and power-off: When the lithium battery power management module 8 detects that the static current continuously remains at X, where the range of X is 2 - 15 A, preferably 5 A, after Y hours, the hold relay K6 is cut off. Y is 0.5 - 6 hours, preferably 0.5 hours. Because the vehicle key and the battery key are separated, and according to the habit of lead-acid batteries, there is no need to turn off the battery, so the discharge and power-off method can be used frequently;

[0042] Charging and power-on when the key is turned off: The auxiliary power supply of the external charger activates the A+ pin of the lithium battery power management module 3 from the two power supply interfaces CHG-A+ and CHG-A-. At the same time, when the lithium battery power management module 8 detects the charging message sent by the external charger, it enters the charging mode and performs corresponding charging configuration;

[0043] Charging and power-on when the key is off: The lithium battery power management module 3 detects a power supply signal on the A+ pin. At this time, if a heartbeat message and a charging message are detected, it is considered to be in the charging mode. After corresponding charging configuration, the charge and discharge relay K4 is closed. After the external charger detects a voltage output, it closes the external charger switch to perform corresponding charging output.

[0044] Charging and power-off: If the battery is fully charged or you want to use the vehicle halfway and no longer need to charge, when the key is off, first click the pause on the charger screen, and then unplug the charge and discharge rema port to achieve charging and power-off; if charging with the key on, click the pause on the charger screen, unplug the REMA port, and disconnect the charging connection part. At this time, the charge and discharge relay K4 is in the off state. It is necessary to go through the power-off process again and then power on to resume using the battery.

[0045] During the above automatic discharging and power-on process, after the self-resetting switch is disconnected, K1 remains closed to keep powering the lithium battery power management module 3. This power supply is supplied to the lithium battery power management module 3 through the KEYON pin activated by the lithium battery power management module 3. Although it is a self-resetting switch after the self-resetting switch is disconnected, the internal start relay K1 can keep the battery in the powered-on state. It should be noted that to power on, the stop switch K8 must be in the conducting state, otherwise the controllable voltage conversion power supply DC-DC1 has no power input and power-on cannot be achieved. The stop switch K8 can be implemented through a two-position knob switch. Automatic discharging and power-on is an emergency solution and is not often used according to user habits.

[0046] It should be noted that Figure 2 The charge and discharge port 8 in is the REMA discharge port, and its pin definitions are as follows. The A+ interface, A- interface, CAN2H interface, and CAN2L interface are all used to plug into the communication interface of the charger with communication, and are not used during discharging. The DC+ interface and DC- interface are used to conduct the charging current during charging and are used to output externally during discharging. The charger with communication can continuously adjust the charging current configuration according to external information such as the cell temperature to avoid the risk of overcurrent often occurring in the battery. Figure 2 The debugging port 9 in includes a charging debugging CANH interface, a charging debugging CANL interface, a vehicle debugging CANL interface, a vehicle debugging CANH interface, a debugging CANL interface, and a debugging CANH. Each interface is led out to improve the maintainability of the system.

[0047] The advantages of the present invention are:

[0048] 1) The charge and discharge use the same port, which not only achieves the purpose of replacing lead-acid batteries but also realizes functions such as power-on and off and charging of lithium batteries, meeting the usage requirements and improving economy;

[0049] 2) The power-on of the reset start switch K7 can meet the user's usage habits and enable the power-on of the lithium battery, providing a wide range of applications for the lithium battery;

[0050] 3) The stop switch K8 is used to turn off in case of an emergency, increasing the system safety;

[0051] 4) It can also be charged with the key on, increasing the system intelligence;

[0052] 5) Charging with communication increases the battery life and provides the performance of the lithium battery cells;

[0053] 6) The sound and light alarm can remind the user of a fault, increasing safety in the wild environment.

[0054] 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 for 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 charge-discharge common-port lead-acid to lithium-ion battery conversion system, characterized in that It includes a lithium battery thermal management module for thermal management of the lithium battery system, a lithium battery pack for power supply, a lithium battery power management module for control and management of the lithium battery system, a lithium battery external output and charging control module for realizing external output and charging control of the lithium battery system, a lithium battery power-on and hold control module for realizing power-on of the lithium battery, a lithium battery power-off control module for realizing power-off of the lithium battery, and a lithium battery fault and information display module for displaying the working state of the lithium battery system. Among them, the lithium battery thermal management module is electrically connected to the lithium battery pack, the lithium battery pack is respectively electrically connected to the lithium battery power management module and the lithium battery external output and charging control module, and the lithium battery power management module is respectively electrically connected to the lithium battery external output and charging control module, the lithium battery power-on and hold control module, the lithium battery power-off control module, and the lithium battery fault and information display module; The lithium battery thermal management module includes a heating film assembly, a heating positive relay K2, and a heating negative relay K5; The lithium battery external output and charging control module includes a pre-charge branch, a charge and discharge relay K4, a DC+ interface, a DC- interface, an A+ interface, an A- interface, a CAN2H interface, and a CAN2L interface; The pre-charge branch includes a pre-charge relay K3 and a pre-charge resistor R1; The lithium battery power-on and hold control module includes a self-resetting start switch K7, a start relay K1, and a controllable voltage conversion power supply DC-DC1; The lithium battery power-off control module includes a stop switch K8; The lithium battery fault and information display module includes a display screen and an audible and visual alarm; 2. The power-on and power-off method of the lithium battery system according to claim 1, characterized in that Include Automatic discharge and power-on: The controllable voltage conversion power supply DC-DC1 is powered on by momentarily pressing the self-resetting start switch K7 to supply power to the lithium battery power management module. After the lithium battery power management module obtains power supply, it drives the output pin to close the start relay K1; Manual discharge and power-off: It is achieved by turning off the stop switch K8; Automatic discharge and power-off: When the lithium battery power management module detects that the static current continuously remains at X, the range of X is 2 - 15 A, the hold relay K6 is cut off after Y hours, and Y is 0.5 - 6 hours; Charging and power-on when the key is off: The auxiliary power supply of the external charger activates the A+ pin of the lithium battery power management module from two power supply interfaces CHG-A+ and CHG-A-. At the same time, when the lithium battery power management module detects a charging message sent by the external charger, it enters the charging mode and performs corresponding charging configuration; Charging and power-on when the key is off: When the lithium battery power management module detects a power supply signal on the A+ pin, and at this time, when it detects a heartbeat message and a charging message, it is considered to be in the charging mode. After performing the corresponding charging configuration, the charge and discharge relay K4 is closed. After the external charger detects a voltage output, it closes the external charger switch and performs corresponding charging output.

3. The power-on and power-off method according to claim 2, characterized in that In the automatic discharge and power-off, X is 5 A and Y is 0.5 hours.

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