WO2018214263A1

WO2018214263A1 - Power supply protection device, battery energy storage system and electrical equipment

Info

Publication number: WO2018214263A1
Application number: PCT/CN2017/093122
Authority: WO
Inventors: 李家德; 苏晓越; 陈其峰
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2017-05-25
Filing date: 2017-07-17
Publication date: 2018-11-29
Also published as: CN206727694U

Abstract

Disclosed are a power supply protection device (100), a battery energy storage system (300) and electrical equipment (400). The power supply protection device (100) comprises: a power supply device (102); a power supply switch relay (104), a first end of the power supply switch relay (104) connecting to an output end of the power supply device (102), and a second end connecting to a load; a switch protection circuit (106) comprising a protection switch (1062) and a shunt element (1064), the protection switch (1062) connecting in series to the shunt element (1064), one end of the protection switch (1062) connecting to the power supply switch relay (104), the other end of the protection switch (1062) connecting to one end of the shunt element (1064), and the other end of the shunt element (1064) connecting to a second end of the power supply switch relay (104). The power supply protection device (100) reduces the potential of the power supply switch relay (104) generating adhesion, increasing the safety of the power supply device.

Description

Power protection device, battery energy storage system and electrical equipment

Technical field

The present application relates to the field of battery technologies, and in particular, to a power protection device, a battery energy storage system, and a power device.

Background technique

At present, large-scale power supply protection devices are widely used in power stations, company energy storage systems, and the like. Among them, it is generally controlled by a power supply switch relay to discharge externally. When the power supply switch relay is turned off, the discharge is stopped, and the power supply switch relay is closed to start discharging.

However, when the power switch relay needs to be turned off, if the current through the power switch relay is too large, a phenomenon such as arcing often occurs, causing the power switch relay to stick and fail to be successfully turned off.

Therefore, how to avoid the occurrence of relay adhesion when the power switch relay is turned off has become a technical problem to be solved.

Application content

The embodiment of the present application provides a power protection device, a battery energy storage system, and a power consumption device, which are designed to solve the technical problem that the relay is likely to occur when the power switch relay is turned off in the related art, and reduce the relay viscosity. The possibility of connecting, improving safety.

In a first aspect, the embodiment of the present application provides a power supply protection device, including: a power supply device; a power switch relay connected to an output end of the power supply device; and a switch protection circuit connected in parallel with the power switch relay, the switch The protection circuit includes a protection switch and a shunt element in series with the shunt element.

In the above embodiment of the present application, optionally, the power supply device includes a plurality of battery modules, and each of the battery modules is formed by connecting a plurality of batteries in parallel.

In the above embodiment of the present application, optionally, the protection switch is a relay.

In the above embodiment of the present application, optionally, the shunt element is a resistor.

In the above embodiment of the present application, optionally, the resistor is a resistance fixed resistance or a resistance adjustable resistor.

In the above embodiment of the present application, optionally, the power switch relay has one or more of the switch protection circuits connected in parallel.

In the above embodiment of the present application, optionally, the shunt elements of each of the switch protection circuits have different resistance levels, and correspondingly, the plurality of switch protection circuits respectively have different security levels.

In the above embodiment of the present application, optionally, the shunt elements of each of the switch protection circuits have the same resistance, and any one of the plurality of switch protection circuits forms a switch protection circuit group. Correspondingly, all of the switch protection circuits in the switch protection circuit group have the same open/close state, and the plurality of switch protection circuit groups respectively have different security levels.

In a second aspect, the embodiment of the present application provides a battery energy storage system, including the power protection device according to any one of the above aspects.

In a third aspect, the embodiment of the present application provides a power device, including the power protection device according to any one of the foregoing first aspects.

In the related art, when the power switch relay is turned off, since the maximum capacity of the power switch relay to turn off the current is constant, when the current through the power supply switch relay is too large, even exceeding the maximum capacity of the open current can be disconnected. When the current is applied, the power switch relay is likely to be difficult to disconnect and cause adhesion.

The above technical solution, for the technical problem, may be a switch protection circuit in parallel with the power supply switch relay, the switch protection circuit includes a protection switch and a shunt component. When the power switch relay is closed and the power supply device discharges, the protection switch of the switch protection circuit is Disconnected, then, when the power switch relay needs to be disconnected, the protection switch of the switch protection circuit can be closed first, so that the protection circuit is turned on. Since the protection circuit has a shunt component, after the protection circuit is turned on, the power supply device flows out. The current is partially shunted by the shunt element, reducing the current through the power switch relay. Since the maximum capacity of the power switch relay to open the current is constant, the smaller the current through the power switch relay, the greater the probability that the power switch relay can be successfully disconnected. Finally, when the power is on After the off relay 104 is turned off, the protection switch 1062 is turned off, thereby smoothly stopping the power supply.

Therefore, through the technical solution, the possibility of adhesion of the power supply switch relay is reduced, and the power supply switch relay is safer and more effective, thereby greatly improving the safety of the power supply device.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. One of ordinary skill in the art can also obtain other drawings based on these drawings without undue creative effort.

1 is a circuit diagram showing the power supply protection device of one embodiment of the present application;

2 is a circuit diagram showing the power supply protection device of another embodiment of the present application;

3 shows a block diagram of a battery energy storage system of one embodiment of the present application;

4 shows a block diagram of a powered device of one embodiment of the present application.

detailed description

For a better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms used in the embodiments of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the application. The singular forms "a", "the", and "the"

1 shows a circuit link of a power protection device of an embodiment of the present application. intention.

As shown in FIG. 1 , an embodiment of the present application provides a power protection device 100 including a power supply device 102 , a power supply switch relay 104 , and a switch protection circuit 106 .

A first end of the power switch relay 104 is coupled to an output of the power supply device 102, a second end of the power switch relay 104 is coupled to the load, and a switch protection circuit 106 is coupled in parallel with the power switch relay 104, the switch protection circuit 106 A protection switch 1062 and a shunt element 1064 are included. The protection switch 1062 is connected in series with the shunt element 1064. One end of the protection switch 1062 is connected to the power switch relay 104, and the other end of the protection switch 1062 is connected to one end of the shunt element 1064. The other end of the shunt element 1064 is coupled to the second end of the power switch relay 104.

In the above technical solution, a switch protection circuit 106 may be connected in parallel to the power supply switch relay 104. The switch protection circuit 106 includes a protection switch 1062 and a shunt element 1064. When the power supply switch relay 104 is closed and the power supply device 102 is discharged, the switch protection circuit 106 is The protection switch 1062 is disconnected. Then, when the power switch relay 104 needs to be disconnected, the protection switch 1062 of the switch protection circuit 106 can be closed to turn on the protection circuit. Since the protection circuit has the shunt component 1064, the protection circuit guide After the pass, the primary current flowing out of the power supply unit 102 is partially shunted by the shunt element 1064, thereby reducing the current through the power switch relay 104. Since the maximum capacity of the power switch relay 104 to turn off the current is constant, the smaller the current through the power switch relay 104, the greater the probability that the power switch relay 104 can be successfully turned off. Finally, when the power switch relay 104 is turned off, the protection switch 1062 is turned off, thereby smoothly stopping the power supply.

Therefore, with the technical solution, the possibility that the power supply switch relay 104 is stuck is reduced, so that the power supply switch relay 104 is safer and more effective, thereby greatly improving the safety of the power supply device 102. In addition, the power protection device 100 also has the following additional technical features:

The power supply device 102 includes a plurality of battery modules, and each battery module is formed by connecting a plurality of batteries in parallel. That is to say, the present application is mainly applied to a case where the power supply current is large, and the more battery modules in the power supply device 102, the greater the power supply capability.

The protection switch 1062 can be a relay, which is a switch that controls a large current through a small current, which has the advantage of high degree of automation. Of course, the protection switch 1062 can also be any other type of switch with an open/close jump function. Relay

The shunting element 1064 can be a resistor or any other component having a resistance value. As long as the original current flowing out of the power supply device 102 can be shunted by the resistance value, the purpose of improving the probability of the power switch relay 104 being successfully disconnected can be achieved.

In an implementation manner of the present application, the resistor is a resistance fixed resistor, and the shunting capability corresponding to the resistance fixed resistor is also fixed.

In another implementation of the present application, the resistor is a resistance adjustable resistor. due to:

Then, if the resistance of the power supply switch relay 104 is 100 ohms, the original current flowing out of the power supply device 102 is 1.1 kA, and when the resistance of the power distribution element is adjusted to 1 k ohm, the current through the power supply switch relay 104 is shunted and reduced to 1 kA, when shunting When the resistance of the element is adjusted to 2.1 k ohms, the current through the power supply switch relay 104 is shunted and reduced to 0.5 kA. That is to say, the actual shunting capability of the switch protection circuit 106 can be adjusted by changing the resistance of the resistor, making the adjustment of the power switch relay 104 and even the entire system more flexible. Of course, the resistance and current parameters of the components in the actual scenario are not limited to the above examples.

It should be added that the load connected to the second end of the power switch relay 104 can be any equipment, a hydropower station or the like that requires electrical energy.

The technical solution of the present application is described in another manner below.

First, the battery management unit receives the power supply stop information, so the protection switch 1062 can be closed according to the power supply stop information, so that the switch protection circuit 106 is in the path. At this time, according to the power supply stop information, the power supply switch relay 104 is turned off. After the switch relay 104 is successfully disconnected, that is, when the current of the branch where the power switch relay 104 is located is zero, the protection switch 1062 is disconnected according to the stop of the power supply information, and finally the purpose of stopping the power supply is achieved. Wherein, in the case that the resistance of the shunt element 1064 is adjustable, the The battery management unit adjusts its resistance. For example, different resistance options can be set on the operation interface of the battery management unit for the user to select.

2 is a circuit diagram showing the power protection device of another embodiment of the present application.

As shown in FIG. 2, the power switch relay 104 has one or more of the switch protection circuits 106 connected in parallel, and the plurality of switch protection circuits 106 are simultaneously shunted to achieve a stronger shunting capability, thereby further reducing the pass of the power switch relay 104. The current increases the probability that the power switch relay 104 is successfully disconnected. Three switch protection circuits 106 are schematically illustrated in FIG. 2, but in actuality, the number of switch protection circuits 106 is not limited thereto.

Based on this, in one implementation manner of the present application, the shunt elements 1064 of each of the switch protection circuits 106 have the same resistance, and any one of the plurality of switch protection circuits 106 forms a switch. The protection circuit 106 is set, and all of the switch protection circuits 106 are in the same open/close state. Accordingly, the plurality of switch protection circuits 106 respectively have different security levels.

For example, four switch protection circuits a, b, c, and d are provided, which can be divided into four groups: a first group a, a second group b and c, a third group a, b, and c, and a fourth group a , b, c, and d, respectively, corresponding to low, medium, high, and highest security levels.

In addition, in another implementation manner of the present application, the size of the resistance of the shunt element 1064 of each of the switch protection circuits 106 is different. Accordingly, the plurality of switch protection circuits 106 respectively have different security levels. In this way, the user can select different switch protection circuits 106 according to actual needs, so that different degrees of security protection can be obtained.

3 shows a block diagram of a battery energy storage system of one embodiment of the present application.

As shown in FIG. 3, the embodiment of the present application provides a battery energy storage system 300, including the power protection device 100 described in any of the embodiments of FIG. 1 and FIG. Therefore, the battery energy storage system 300 has the same technical effects as the power protection device 100 described in any of the embodiments of FIG. 1 and FIG. 2, and details are not described herein again.

As shown in FIG. 4, the embodiment of the present application provides an electrical device 400, including the power protection device 100 described in any of the embodiments of FIG. 1 and FIG. Therefore, the electrical device 400 has the same technical effects as the power protection device 100 described in any of the embodiments of FIG. 1 and FIG. 2, and details are not described herein again.

The technical solution of the present application is described in detail above with reference to the accompanying drawings. By the technical solution of the present application, the possibility of adhesion of the power supply switch relay is reduced, and the power supply switch relay is more safe and effective, thereby greatly improving the safety of the power supply device. .

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims

A power supply protection device, comprising:

Power supply device

a power switch relay, a first end of the power switch relay is connected to an output end of the power supply device, and a second end of the power switch relay is connected to a load;

a switch protection circuit, the switch protection circuit including a protection switch and a shunt element, the protection switch being connected in series with the shunt element, wherein one end of the protection switch is connected to the power switch relay, and the other end of the protection switch Connected to one end of the shunt element, the other end of the shunt element is connected to the second end of the power switch relay.
The power supply protection device according to claim 1, wherein the power supply device comprises a plurality of battery modules, and each of the battery modules is formed by connecting a plurality of batteries in parallel.
The power supply protection device according to claim 1, wherein the protection switch is a relay.
The power supply protection device of claim 1 wherein said shunt element is a resistor.
The power supply protection device according to claim 4, wherein the resistor is a resistance fixed resistor or a resistance adjustable resistor.
The power supply protection device according to any one of claims 1 to 5, characterized in that the power supply switch relay has one or more of the switch protection circuits connected in parallel.
The power supply protection device according to claim 6, wherein the shunt element of each of the switch protection circuits has a different resistance;

Correspondingly, the plurality of switch protection circuits respectively have different security levels.
The power supply protection device according to claim 6, wherein the shunt element of each of said switch protection circuits has the same magnitude of resistance, and

Any one of the plurality of switch protection circuits forms a switch protection circuit group;

The opening and closing states of all the switch protection circuits in any of the switch protection circuit groups are the same, and correspondingly, the plurality of switch protection circuit groups respectively have different security levels.
A battery energy storage system characterized by comprising the claims 1 to 8 A power protection device as claimed in any of the preceding claims.
An electric device characterized by comprising the power supply protection device according to any one of claims 1 to 8.