BMS charging and discharging circuit and BMS power bank

Abstract

The utility model relates to the technical field of charge pal circuits, in particular to a BMS charge and discharge circuit and a BMS charge pal, the BMS charge and discharge circuit comprises a charge and discharge module, a BMS module, a boost module and a lithium battery pack, in the charging process of the lithium battery pack, the charge and discharge module is internally provided with a charge and discharge fast charge chip, and the charge and discharge fast charge chip is connected with the BMS module. The charging and discharging module is used for acquiring an external power supply voltage through a charging and discharging interface electrically connected with the charging and discharging module and converting the external power supply voltage into a first charging voltage according to a fast charging protocol corresponding to the charging and discharging fast charging chip; the boosting module is connected to the charging and discharging module to receive the first charging voltage and boost the first charging voltage to obtain a second charging voltage; the BMS module is electrically connected to the boost module to receive the second charging voltage. The BMS module is further electrically connected to the lithium battery pack through the lithium battery interface to charge the lithium battery pack through the second charging voltage. The charge pal has the effect of improving the charging speed when the lithium battery in the charge pal is charged.

Description

Technical Field

[0001] The present application relates to the technical field of power bank circuits, and in particular to a BMS charging and discharging circuit and a BMS power bank. Background Art

[0002] Power banks are portable charging devices used by current mobile devices, electric vehicles and their power-consuming devices. They discharge power-consuming devices through their own lithium batteries, and recharge their own lithium batteries through external power sources when their own lithium batteries are exhausted. Current power banks are equipped with BMS systems to manage the charging and discharging of lithium batteries and extend the life of power banks.

[0003] At the same time, with the increasing demand of current users for electrical devices, especially mobile devices such as mobile phones and computers, more and more power banks are beginning to support the fast charging protocols corresponding to different brands of mobile phones or computers to achieve fast charging of electrical devices.

[0004] However, the problem in the related technology is that the current power bank can only achieve fast charging when discharging the electrical equipment, but cannot achieve fast charging when charging the lithium battery. This results in a long time required to charge the lithium battery when the power bank is exhausted or about to be exhausted. Summary of the invention

[0005] The purpose of this application is to increase the charging speed when charging the lithium battery in the power bank.

[0006] In the first aspect, the present application provides a BMS charging and discharging circuit, which adopts the following technical solution:

[0007] A BMS charging and discharging circuit includes a charging and discharging module, a BMS module, a boost module, and a lithium battery pack. During the charging process of the lithium battery pack,

[0008] The charging and discharging module is equipped with a charging and discharging fast charging chip, and the charging and discharging module is used to obtain an external power supply voltage through a charging and discharging interface electrically connected thereto, and convert the external power supply voltage into a first charging voltage according to a fast charging protocol corresponding to the charging and discharging fast charging chip;

[0009] The boost module is connected to the charge and discharge module to receive the first charging voltage, and boosts the first charging voltage to obtain a second charging voltage;

[0010] The BMS module is electrically connected to the boost module to receive the second charging voltage. The BMS module is also electrically connected to the lithium battery pack through a lithium battery interface to charge the lithium battery pack through the second charging voltage.

[0011] In some other embodiments, during the discharge process of the lithium battery pack,

[0012] The lithium battery pack releases the discharge voltage through the lithium battery interface;

[0013] The BMS module receives the discharge voltage and sends the discharge voltage to the charge and discharge module;

[0014] The charge and discharge module receives the discharge voltage, and adjusts the discharge voltage to a fast charge and discharge voltage through a fast charge protocol corresponding to the charge and discharge fast charge chip so as to discharge to the outside through the charge and discharge interface.

[0015] In other embodiments, the charging and discharging interface is a type-c interface.

[0016] In some other embodiments, there are two charging and discharging modules, and each of the two charging and discharging modules corresponds to one charging and discharging interface.

[0017] In other embodiments, it also includes a step-down power supply module and a step-down discharge interface, one end of the step-down power supply module is connected to the BMS module to receive the discharge voltage, and is used to step down the discharge voltage to generate a step-down discharge voltage, the step-down power supply module is connected to the charge and discharge module to power the charge and discharge module, and the step-down power supply module is also connected to the step-down discharge interface to discharge the step-down discharge voltage to the outside through the step-down discharge interface.

[0018] In other embodiments, the step-down discharge interface is a type-a interface.

[0019] In other embodiments, the BMS module is also electrically connected to a discharge interface, and the BMS module is used to discharge the discharge voltage to the outside through the discharge interface.

[0020] In other embodiments, the fast charging and discharging chip is a SOC chip with model number M12269.

[0021] In the second aspect, the present application provides a BMS power bank, which adopts the following technical solution:

[0022] A BMS power bank, characterized in that it includes the above-mentioned BMS charging and discharging circuit

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the two-way fast charging protocol, the lithium battery pack can also be charged through the fast charging protocol when the external power supply is connected, and the charging voltage is further boosted to increase the charging speed;

[0025] 2. There are abundant discharge interfaces, which can charge electrical devices of various interface types, and it has strong expandability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall module of an embodiment of the present application;

[0027] Figure 2 It is a circuit connection diagram of a charging and discharging module and a charging and discharging interface in this application;

[0028] Figure 3 It is a circuit connection diagram of another charging and discharging module and charging and discharging interface in the present application;

[0029] Figure 4 It is a circuit connection diagram of the boost module in this application;

[0030] Figure 5 It is a circuit connection diagram of the BMS module, lithium battery pack and discharge interface in this application;

[0031] Figure 6 It is a circuit connection diagram of the step-down power supply module and the step-down discharge interface in this application.

[0032] In the figure, 1. Charge and discharge module; 11. Charge and discharge fast charging chip; 2. BMS module; 3. Boost module; 4. Lithium battery pack; 5. Charge and discharge interface; 6. Lithium battery interface; 7. Step-down power supply module; 8. Step-down discharge interface; 9. Discharge interface. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0034] like Figure 1 As shown, a BMS charging and discharging circuit includes a charging and discharging module 1, a BMS module 2, a boost module 3, and a lithium battery pack 4.

[0035] like Figure 1 and Figure 2 As shown, during the charging process of the lithium battery pack 4:

[0036] The charge and discharge module 1 has a built-in charge and discharge fast charging chip 11. The charge and discharge module 1 is used to obtain an external power supply voltage through a charge and discharge interface 5 to which it is electrically connected, and convert the external power supply voltage into a first charging voltage according to a fast charging protocol corresponding to the charge and discharge fast charging chip 11.

[0037] Among them, the fast charge and discharge chip 11 in this application is a SOC chip with model number M12269. It is a dedicated SOC for multi-cell high-power mobile power and energy storage applications, integrating a synchronous buck-boost voltage converter, a drive module 2BMS, a battery charge and discharge management module 2BMS, a display module 2BMS, and a power calculation module 2BMS, providing a single C port with a maximum input / output power of 140W, supporting mainstream fast charge protocols such as PD3.1, QC3.0, AFC, FCP, SCP, BC1.2DCP, and providing input / output overvoltage / undervoltage, battery overvoltage / undervoltage, NTC high and low temperature, discharge overcurrent, short circuit protection and other complete protection functions.

[0038] The charging and discharging interface 5 in this application is a type-c port interface, which is supported by the M12269 chip. The type-c interface is a bidirectional interface that can realize charging and discharging functions and supports various fast charging protocols.

[0039] When the external power supply is inserted into the charge and discharge interface 5, the charge and discharge module 1 obtains the external power supply voltage corresponding to the external power supply, and converts the external power supply voltage into a first charging voltage through the fast charging protocol of the M12269 chip. The first charging voltage is 28V in this application.

[0040] The boost module 3 is connected to the charge and discharge module 1 to receive a first charging voltage, and boosts the first charging voltage to obtain a second charging voltage.

[0041] like Figure 4 As shown, in the present application, the boost module 3 is a BOOST boost chopper circuit, which can obtain the first charging voltage, that is, 28V voltage, and boost it to 29V and transfer it to the subsequent BMS module 2.

[0042] like Figure 1 and Figure 5 As shown, the BMS module 2 is electrically connected to the boost module 3 to receive the second charging voltage, and the BMS module 2 is also electrically connected to the lithium battery pack 4 through the lithium battery interface 6 to charge the lithium battery pack 4 through the second charging voltage.

[0043] The BMS module 2 is mainly used to manage the charging and discharging process of the lithium battery, on the one hand to improve the service life of the lithium battery pack 4, on the other hand to improve the charging and discharging utilization rate. The BMS module 2 transmits 29V stably to the lithium battery pack 4 to charge the lithium battery pack 4, so that the lithium battery pack 4 can be quickly charged under the fast charging protocol. In this application, the lithium battery pack 4 has 7 lithium batteries connected in series, and each lithium battery has an independent balancing switch to achieve balanced charging and discharging.

[0044] During the discharge process of the lithium battery pack 4:

[0045] like Figure 1 As shown, the lithium battery pack 4 releases the discharge voltage through the lithium battery interface 6. After receiving the discharge voltage, the BMS module 2 sends the discharge voltage to the charge and discharge module 1. The charge and discharge module 1 receives the discharge voltage and adjusts the discharge voltage to a fast charge and discharge voltage through the fast charge protocol corresponding to the charge and discharge fast charge chip 11 to discharge to the outside through the charge and discharge interface 5.

[0046] That is to say, when an electrical device is inserted into the charging and discharging interface 5, that is, the type-c interface, if the fast charging protocol corresponding to the electrical device exists and the fast charging protocol supported by the charging and discharging fast charging chip 11, then when the lithium battery pack 4 is discharged, it will match the corresponding fast charging protocol to discharge to the external electrical device through the type-c interface.

[0047] like Figure 1 As shown, in some other embodiments, there are two charging and discharging modules 1 , and the two charging and discharging modules 1 each correspond to one charging and discharging interface 5 .

[0048] like Figure 2 and Figure 3 As shown, in the subsequent disclosure, the two charging and discharging modules 1 are respectively defined as charging and discharging module 1 one and charging and discharging module 1 two. Similarly, there is a corresponding charging and discharging fast charging chip 11 for each of the two charging and discharging modules 1, and the model number is M12269.

[0049] This can meet the needs of fast charging of two external electrical devices at the same time. The internal control chip of M12269 can realize two-way independent fast charging and discharging through the protocol.

[0050] At the same time, when charging the lithium battery pack 4, the two charging and discharging modules 1 can supply power to the boost module 3 separately and there is no interference between the two modules 2BMS. The charging and discharging module 11 and the charging and discharging module 12 can independently control the enabling and disabling of the boost module 3 through the 1 pin of their own chip M12269.

[0051] like Figure 6 As shown, in some other embodiments, a step-down power supply module 7 and a step-down discharge interface 8 are also included.

[0052] One end of the step-down power supply module 7 is connected to the BMS module 2 to receive the discharge voltage, and is used to step down the discharge voltage to generate a step-down discharge voltage. The step-down power supply module 7 is connected to the charge and discharge module 1 to power the charge and discharge module 1. The step-down power supply module 7 is also connected to the step-down discharge interface 8 to discharge the step-down discharge voltage to the outside through the step-down discharge interface 8.

[0053] The lithium battery pack 4 discharges to the BMS module 2, and the BMS module 2 sends the discharge voltage to the buck power module 7. The buck power module 7 steps down the discharge voltage to 5V through the BUCK circuit, and discharges to external electrical equipment through the buck discharge interface 8.

[0054] The step-down discharge interface 8 is a type-a interface in the embodiment of the present application. The type-a interface is a unidirectional interface, which can only discharge to external electrical equipment, but cannot charge the lithium battery pack 4. At the same time, the interface does not have fast charging and can only discharge 5V.

[0055] Both the charge-discharge module 1-1 and the charge-discharge module 1-2 are powered by the step-down power supply module 7. The charge-discharge module 1-1 is connected to the diode through the 24-pin of its own chip M12269. Similarly, the charge-discharge module 1-2 is also connected to the diode through the 24-pin of its own chip M12269, and then connected to the enable pin of the BUCK chip in the BUCK circuit in the step-down power supply module 7. The enable pin is connected to a resistor pulled down to the ground. Both charge-discharge modules 1 can independently control the enablement and disablement of the step-down power supply module 7 through the 24-pin.

[0056] like Figure 5 As shown, in other embodiments, the BMS module 2 further includes a discharge interface 9, through which the BMS system can directly discharge the discharge voltage to external electrical equipment.

[0057] Through the above settings, the BMS charging and discharging circuit can discharge external electrical equipment through a variety of interfaces, and the interfaces are rich.

[0058] The present application also discloses a BMS power bank, which includes the above-mentioned BMS charging and discharging circuit.

[0059] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A BMS charging and discharging circuit, characterized in that: The invention comprises a charging and discharging module (1), a BMS module (2), a boost module (3), and a lithium battery pack (4); the charging and discharging module (1) has a built-in charging and discharging fast charging chip (11); the boost module (3) is connected to the charging and discharging module (1); the BMS module (2) is electrically connected to the boost module (3); and the BMS module (2) is also electrically connected to the lithium battery pack (4); wherein, during the charging process of the lithium battery pack (4), The charging and discharging module (1) is used to obtain an external power supply voltage through a charging and discharging interface (5) electrically connected thereto, and convert the external power supply voltage into a first charging voltage according to a fast charging protocol corresponding to the charging and discharging fast charging chip (11); The boost module (3) receives the first charging voltage and boosts the first charging voltage to obtain a second charging voltage; The BMS module (2) receives the second charging voltage and charges the lithium battery pack (4) using the second charging voltage.

2. The BMS charging and discharging circuit according to claim 1, characterized in that: During the discharge process of the lithium battery pack (4), The lithium battery pack (4) releases a discharge voltage through a lithium battery interface (6); The BMS module (2) receives the discharge voltage and sends the discharge voltage to the charge and discharge module (1); The charge and discharge module (1) receives the discharge voltage, and adjusts the discharge voltage to a fast charge and discharge voltage through a fast charge protocol corresponding to the charge and discharge fast charge chip (11) so as to discharge to the outside through the charge and discharge interface (5).

3. The BMS charging and discharging circuit according to claim 2, characterized in that: The charging and discharging interface (5) is a type-c interface.

4. The BMS charging and discharging circuit according to claim 1, 2 or 3, characterized in that: There are two charging and discharging modules (1), and each of the two charging and discharging modules (1) corresponds to one charging and discharging interface (5).

5. The BMS charging and discharging circuit according to claim 2, characterized in that: It also comprises a step-down power supply module (7), wherein the step-down power supply module (7) is connected to the charging and discharging module (1) to supply power to the charging and discharging module (1).

6. The BMS charging and discharging circuit according to claim 5, characterized in that: It also includes a step-down discharge interface (8), one end of the step-down power supply module (7) is connected to the BMS module (2) to receive the discharge voltage, and is used to step down the discharge voltage to generate a step-down discharge voltage, and the step-down power supply module (7) is connected to the step-down discharge interface (8) to discharge the step-down discharge voltage to the outside through the step-down discharge interface (8).

7. The BMS charging and discharging circuit according to claim 6, characterized in that: The voltage reduction discharge interface (8) is a type-a interface.

8. The BMS charging and discharging circuit according to claim 2, characterized in that: The BMS module (2) is also electrically connected to a discharge interface (9), and the BMS module (2) is used to discharge the discharge voltage to the outside through the discharge interface (9).

9. The BMS charging and discharging circuit according to claim 1, characterized in that: The fast charge and discharge chip (11) is a SOC chip with model number M12269.

10. A BMS power bank, characterized in that: The invention comprises a BMS charging and discharging circuit as claimed in any one of claims 1 to 8.

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