WO2023077701A1

WO2023077701A1 - Tray charging and discharging switching circuit

Info

Publication number: WO2023077701A1
Application number: PCT/CN2022/079703
Authority: WO
Inventors: 刘俊军; 胡勇
Original assignee: 西安快舟机电科技有限公司
Priority date: 2021-11-08
Filing date: 2022-03-08
Publication date: 2023-05-11
Also published as: CN113890159A

Abstract

The present invention relates to the technical field of battery formation and capacity grading, and specifically relates to a tray charging and discharging switching circuit. The tray charging and discharging switching circuit comprises a plurality of tray batteries and a plurality of charging and discharging circuits, wherein the charging and discharging circuits are correspondingly connected to the tray batteries, so that the tray batteries are in a charging, bypass or discharging state; each charging and discharging circuit comprises a charging circuit and a discharging circuit; the charging circuit is connected to a charging constant current power supply; the discharging circuit is connected to a discharging constant current power supply; and the charging circuit and the discharging circuit are formed by switching changeover switches. The tray charging and discharging switching circuit provided by the present invention solves the problem that all the tray group batteries in the same high-voltage group string can only be charged or discharged, and realizes the asynchronous operation of charging and discharging of each tray battery pack, i.e., allowing to randomly set the charging and discharging state of each tray battery in the same device.

Description

A tray charging and discharging switching circuit

technical field

The invention belongs to the technical field of battery formation and capacity separation, and in particular relates to a tray charging and discharging switching circuit.

Background technique

Series formation is an emerging development direction of lithium battery formation and capacity separation equipment. Because it has many advantages such as simple equipment and good energy-saving effect, it has become the main research direction of major equipment manufacturers today.

The high-voltage serial formation technology with a high number of strings can greatly improve the energy-saving effect of formation and capacity separation equipment. However, due to the limitations of the series connection method - the entire set of batteries must be charged or discharged at the same time. It makes it difficult for the high-voltage series method to meet the demand for equipment flexibility in actual production, which makes it difficult to apply the high-voltage series formation technology and improve the actual production efficiency.

In order to solve the above-mentioned problems encountered in the development of high-voltage series formation and capacity division technology, the present invention provides a tray-type discharge switching circuit.

Contents of the invention

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages as will be described hereinafter.

Another object of the present invention is to provide a tray charging and discharging switching circuit, which solves the problem that all tray batteries in the same high-voltage string can only be charged or only discharged, and realizes the charging and discharging of each tray battery.

In order to achieve these objects and other advantages according to the present invention, the present invention provides a tray charging and discharging switching circuit, comprising:

multiple tray batteries;

A plurality of charging and discharging circuits, which are correspondingly connected to the tray battery, so that the tray battery is in a state of charging, bypassing or discharging, the charging and discharging circuit includes a charging circuit and a discharging circuit, and the charging circuit is connected to a charging constant current power supply connected, the discharge circuit is connected to a discharge constant current power supply, and the charge circuit and the discharge circuit are formed by switching.

Preferably, the charging and discharging circuit further includes an access switch and a bypass switch, one end of the access switch is connected to the tray battery, and the other end of the access switch is connected to one end of the bypass switch , the other end of the bypass switch is respectively connected to the charge constant current power supply and the discharge constant current power supply.

Preferably, the access switch is turned off, the bypass switch is turned on, and both the charging and discharging circuit and the battery tray are in a bypass state.

Preferably, the switch includes a first switch and a second switch, one end of the first switch is connected to the access switch, one end of the second switch is connected to the tray battery, The other ends of the first switch and the second switch are respectively connected to one end of the bypass switch, and the other ends of the bypass switch are respectively connected to the charging constant current power supply and the discharging constant current power supply. connect.

Preferably, a plurality of diodes are further included, and the plurality of diodes are respectively connected in parallel at both ends of the access switch, the bypass switch and the transfer switch.

Preferably, the bypass switch includes a first bypass switch and a second bypass switch, one end of the first bypass switch is respectively connected to the first switching switch and the charging constant current power supply, the The other end of the first bypass switch is respectively connected to the second switching switch and the charging constant current power supply; one end of the second bypass switch is respectively connected to the first switching switch and the discharging constant current power supply , the other end of the second bypass switch is respectively connected to the second switching switch and the discharge constant current power supply.

Preferably, the access switch is turned on, and the switching switch is connected to the charging constant current power supply to form a charging circuit. At this time, the first bypass switch is turned off, and the second bypass switch is turned on. Pass;

Wherein, the charging circuit is used for charging the tray battery.

Preferably, the access switch is turned on, and the switching switch is connected to the discharge constant current power supply to form a discharge circuit. At this time, the first bypass switch is turned on, and the second bypass switch is turned off. open;

Wherein, the discharge circuit is used to discharge the tray battery.

Preferably, a plurality of charging and discharging circuits are connected in series with the charging constant current power supply and the discharging constant current power supply through the switch.

The present invention at least includes the following beneficial effects

1. The tray charging and discharging switching circuit provided by the present invention adopts a series connection method for charging and discharging, so the voltage of the battery pack is high, the power conversion efficiency is high, and the energy saving effect is obvious.

2. The tray charging and discharging switching circuit provided by the invention can realize the control of cutting in and out of the tray battery through the bypass switch, so as to ensure that the battery pack that exits the process in advance will not affect the normal operation of the system on other battery packs.

3. The tray charging and discharging switching circuit provided by the present invention saves a large number of connecting wires between the power supply cabinet and the battery, reduces line loss, and saves wire resources.

4. The tray charging and discharging switching circuit provided by the present invention greatly simplifies the circuit structure of the chemical capacity equipment, can effectively replace the complicated charging and discharging circuit of traditional equipment, and indirectly improves the reliability of the equipment while greatly reducing the equipment cost.

5. The tray charging and discharging switching circuit provided by the present invention adopts a series circuit, which can achieve higher charging efficiency and feedback efficiency than other methods.

Description of drawings

Fig. 1 is a schematic diagram of the charging and discharging switching circuit of the tray according to the present invention;

Fig. 2 is the schematic diagram of the charging circuit of normal constant current described in the present invention;

Fig. 3 is the circuit diagram after the switching circuit of the present invention starts to switch and disconnects the access switch;

Fig. 4 is a diagram of the current flow of the battery pack being bypassed after switching according to the present invention;

Fig. 5 is an action diagram of a toggle switch during the switching process of the present invention;

Fig. 6 is the current flow diagram after the bypass switch S5 of the present invention is disconnected;

Fig. 7 is a flow chart of battery discharge current according to the present invention;

Among them, BT1-tray battery, S1-access switch, D1-is the parallel diode of the access switch S1, S2-is the first switch, S-3 is the second switch, S4-the first bypass switch, S5 - second bypass switch, D2 - parallel diode of the first bypass switch, D3 - parallel diode of the second bypass switch.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

In this specification, when an element is referred to as being "connected or coupled to" another element or "disposed in another element", it may be "directly" connected or coupled to the other element or " directly" is set in another element. or connected to or coupled to or disposed in another element with other elements interposed therebetween, unless it is volumetrically "coupled or connected to" another element or "directly disposed" in another element in a component. In addition, it will be understood that when an element is referred to as being "on," "above," "beneath" or "beneath" another element, it can be the same as that of another element. An element "directly" contacts or is in contact with another element with other elements interposed therebetween unless it is referred to as being in direct contact with another element.

The present invention provides a tray charging and discharging switching circuit, as shown in Figure 1, comprising:

Multiple tray batteries, which are characterized by turnover trays, are the objects that need to be formed or divided in this circuit;

A plurality of charging and discharging circuits, which are correspondingly connected to the tray battery, so that the tray battery is in a state of charging, bypassing or discharging, the charging and discharging circuit includes a charging circuit and a discharging circuit, and the charging circuit is connected to a charging constant current power supply connected, the discharge circuit is connected to the discharge constant current power supply, the charging circuit and the discharge circuit are formed by switching the switching switch, and when the switching switch is switched to connect to the charging constant current power supply, the tray battery and the charging The constant current power supply is connected to form a charging circuit to charge the tray battery. When the switch is switched to connect with the discharge constant current power supply, the tray battery is connected to the discharge constant current power supply to form a discharge point circuit to discharge the tray battery. When the tray battery is not connected to a constant current power supply for charging or discharging, the tray battery is in a bypass state. At this time, the battery tray can be plugged and unplugged at will, which has no effect on the charging and discharging of other batteries connected in series.

This method solves the problem that all tray batteries in the same high-voltage string can only be charged or only discharged, and realizes the asynchronous operation of charging and discharging for each tray group, that is, it allows arbitrarily setting each tray in the same equipment. The charging and discharging status of the group.

Specifically, the charging and discharging circuit further includes an access switch S1 and a bypass switch, one end of the access switch S1 is connected to the tray battery, and the other end of the access switch S1 is connected to the bypass switch. One end is connected, and the other end of the bypass switch is connected to the charging constant current power supply and the discharging constant current power supply respectively, and the bypass switch is used to put the battery in the charging and discharging circuit, or put the battery in the charging and discharging circuit outside;

Specifically, the switch includes a first switch S2 and a second switch S3, one end of the first switch S2 is connected to the access switch S1, and one end of the second switch S3 is connected to the The tray battery is connected, the other ends of the first switch S2 and the second switch S3 are respectively connected to one end of the bypass switch, and the other ends of the bypass switch are respectively connected to the charging constant current power supply, The discharge constant current power supply is connected.

Specifically, it also includes a plurality of diodes, which are respectively connected in parallel to the two ends of the access switch, the bypass switch and the transfer switch, and the function of the plurality of diodes is a parallel switch When off, it acts as a soft switch.

Specifically, the bypass switch includes a first bypass switch S4 and a second bypass switch S5, and one end of the first bypass switch S4 is connected to the first switching switch S2 and the charging constant current power supply respectively. , the other end of the first bypass switch S4 is respectively connected to the second switching switch S3 and the charging constant current power supply; one end of the second bypass switch S5 is respectively connected to the first switching switch S2, The discharge constant current power supply is connected, and the other end of the second bypass switch S5 is respectively connected to the second switching switch S3 and the discharge constant current power supply.

On the basis of the above situation, there is another embodiment, as shown in Figure 2, when the battery tray is inserted, the controller automatically monitors the battery pack and is in the state of charging and forming, the access switch S1 is turned on, and the first switch S2 is switched And the second switching switch S3 is connected with the charging constant current power supply to form a charging circuit. At this time, the current of the constant current charging power supply flows in from the first switching switch S2, through S1, the current flows into the battery pack, and then passes through the second switching The switch S3 flows into the next group of battery trays, and finally flows back to the constant current charging power supply. In this working state, the first bypass switch S4 is turned off, and the second bypass switch S5 is turned on;

When the battery is switched from the constant current charging state to the shelving state, as shown in Figure 3, the access switch is disconnected first, and at this time the current passes through the parallel diode connected to the switch S1. At this time, the diode works in soft start mode with less loss, which belongs In the beginning stage of switching, after S1 is disconnected, the first bypass switch S4 needs to be turned on; as shown in Figure 4, the access switch S1 is disconnected, the bypass switch is turned on, and the charging and discharging circuit and the tray battery are both In the bypass state, through the above operations, the operation of the battery pack from charging to shelving is realized.

When the battery pack is on hold, the operation of the switching circuit is shown in Figure 5, the access switch S1 is in the off state, the first bypass switch S4 and the second bypass switch S5 are in the on state, the switching circuit And the battery pack is in the bypass state. At this time, the battery tray can be plugged and unplugged at will, which does not affect the charging and discharging of other batteries in the series, and is completely isolated.

On the basis of the above situation, in another embodiment, when the battery pack needs to be in a discharging state according to the composition and capacity process, as shown in Figure 6, first switch the first switch S2 and the second switch S3 to discharge circuit. Afterwards, the second bypass switch S5 is turned off, and at this time, the current of the constant current discharge power supply flows through the diode connected in parallel with the second bypass switch S5, and at this time, the diode connected in parallel with S5 is a soft switch. After turning on the access switch S1, as shown in Figure 7, the access switch S1 is turned on, and the switch is connected to the discharge constant current power supply to form a discharge circuit. At this time, the current of the discharge constant current power supply flows from the next stage The circuit switch flows into the switching switch S3 of the circuit, and then flows out from the battery. After passing through the switching switch S1 and the switching switch S2, it flows into the switching circuit of the next level, thus realizing the transition of the battery tray from the shelving state to the discharging state. switch. At this time, the first bypass switch S4 is turned on, and the second bypass switch S5 is turned off.

Specifically, a plurality of charging and discharging circuits are connected in series with the charging constant current power supply and the discharging constant current power supply through the switch. Compared with other methods, the series formation circuit can achieve higher charging efficiency and feedback efficiency.

The bypass switch and access switch provided by the present invention are MOS switches provided with parasitic diodes, and the switching switch, bypass switch and access switch are controlled by controllers inside the discharge constant current power supply and the charge constant current power supply.

The invention enables the continuous transition of the single battery cell from the constant current charging stage to the constant current discharging stage, and at the same time realizes cut-in and cut-out control of the battery cell through the bypass switch, ensuring that the battery cell that exits the process in advance does not affect the system Normal operation of other cells. Realize the same effect as traditional chemical forming equipment.

The tray charging and discharging switching circuit provided by the present invention is applied to the battery charging and discharging switching system in the lithium battery high-voltage series asynchronous formation and capacity sharing system, which can improve the adaptability of the high-voltage series formation technology in actual production and meet the needs of actual production , the high-voltage series formation and volume separation technology can be practical.

It is obvious that those skilled in the art can obtain various effects that have not been directly mentioned according to the various embodiments that are not troublesome from various structures according to the embodiments of the present invention.

Although embodiments of the present invention have been disclosed above, it is not limited to the applications set forth in the specification and examples. It can be fully applied to various fields suitable for the present invention. Additional modifications can readily be made by those skilled in the art. Therefore, the invention should not be limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

A tray charging and discharging switching circuit, characterized in that it includes:

multiple tray batteries;

A plurality of charging and discharging circuits, which are correspondingly connected to the tray battery, so that the tray battery is in a state of charging, bypassing or discharging, the charging and discharging circuit includes a charging circuit and a discharging circuit, and the charging circuit is connected to a charging constant current power supply connected, the discharge circuit is connected to a discharge constant current power supply, and the charge circuit and the discharge circuit are formed by switching.
The tray charging and discharging switching circuit according to claim 1, characterized in that, the charging and discharging circuit further includes an access switch and a bypass switch, one end of the access switch is connected to the tray battery, and the access switch The other end of the switch is connected to one end of the bypass switch, and the other end of the bypass switch is respectively connected to the charging constant current power supply and the discharging constant current power supply.
The charging and discharging switching circuit of the tray according to claim 2, wherein the access switch is turned off, the bypass switch is turned on, and both the charging and discharging circuit and the tray battery are in a bypass state.
The tray charging and discharging switching circuit according to claim 2, wherein the switching switch includes a first switching switch and a second switching switch, one end of the first switching switch is connected to the access switch, and the One end of the second switch is connected to the tray battery, the other ends of the first switch and the second switch are respectively connected to one end of the bypass switch, and the other ends of the bypass switch are respectively connected to The charge constant current power supply and the discharge constant current power supply are connected.
The charging and discharging switching circuit of the tray according to claim 2, further comprising a plurality of diodes, and the plurality of diodes are respectively connected in parallel between the access switch, the bypass switch and the transfer switch. ends.
The tray charging and discharging switching circuit according to claim 4, wherein the bypass switch includes a first bypass switch and a second bypass switch, and one end of the first bypass switch is connected to the first bypass switch respectively. The switching switch is connected to the charging constant current power supply, and the other end of the first bypass switch is respectively connected to the second switching switch and the charging constant current power supply; one end of the second bypass switch is connected to the charging constant current power supply respectively. The first switch and the discharge constant current power supply are connected, and the other end of the second bypass switch is respectively connected with the second switch and the discharge constant current power supply.
The tray charging and discharging switching circuit according to claim 6, characterized in that, the access switch is turned on, and the switching switch is connected to the charging constant current power supply to form a charging circuit. At this time, the first bypass The bypass switch is turned off, and the second bypass switch is turned on;

Wherein, the charging circuit is used for charging the tray battery.
The tray charging and discharging switching circuit according to claim 6, wherein the switch is turned on, and the switching switch is connected to the discharge constant current power supply to form a discharging circuit. At this time, the first side The bypass switch is turned on, and the second bypass switch is turned off;

Wherein, the discharge circuit is used to discharge the tray battery.
The tray charging and discharging switching circuit according to any one of claims 1 to 8, wherein a plurality of charging and discharging circuits are connected in series with the charging constant current power supply and the discharging constant current power supply through the switching switch .