CN206727694U - Power supply protection device, battery energy storage system and electrical equipment - Google Patents

Abstract

The utility model provides a power supply protection device, a battery energy storage system and electrical equipment. The power supply protection device includes: a power supply device; a power supply switch relay, the first end of the power supply switch relay is connected to the output end of the power supply device, and the second end connected to the load; the switch protection circuit includes a protection switch and a shunt element, the protection switch is connected in series with the shunt element, one end of the protection switch is connected to the power supply switch relay, the other end of the protection switch is connected to one end of the shunt element, and the other end of the shunt element is connected to the The second end of the power supply switch relay is connected. The utility model reduces the possibility of adhesion of the power supply switch relay and improves the safety of the power supply device.

Description

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

【Technical field】

The utility model relates to the technical field of batteries, in particular to a power supply protection device, a battery energy storage system and an electric device.

【Background technique】

At present, large-scale power supply protection devices are widely used in power stations, company energy storage systems, etc. Wherein, a power supply switch relay is generally used to control whether to discharge externally, and the discharge is stopped when the power supply switch relay is turned off, and the discharge is started when the power supply switch relay is closed.

However, when the power supply switch relay needs to be turned off, if the current passing through the power supply switch relay is too large, undesirable phenomena such as arcing often occur, causing the power supply switch relay to stick and cannot be successfully shut down.

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

【Content of utility model】

The embodiment of the utility model provides a power supply protection device, a battery energy storage system, and an electrical equipment, aiming to solve the technical problem in the related art that the relay is prone to stick when the power supply switch relay is turned off, and reduce the power consumption of the relay. The possibility of sticking improves safety.

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

In the above embodiments of the present invention, optionally, the power supply device includes several battery modules, and each battery module is formed by several batteries connected in parallel.

In the above embodiments of the present utility model, optionally, the protection switch is a relay.

In the above embodiments of the present invention, optionally, the shunt element is a resistor.

In the above embodiments of the present invention, optionally, the resistor is a fixed resistance resistor or an adjustable resistance resistor.

In the above embodiments of the present invention, optionally, the power supply switch relay is connected in parallel with one or more of the switch protection circuits.

In the above embodiments of the present invention, optionally, the shunt elements of each of the switch protection circuits have different resistances, and correspondingly, the plurality of switch protection circuits respectively have different safety levels.

In the above embodiments of the present invention, optionally, the resistance of the shunt element of each of the switch protection circuits is the same, and any number of switch protection circuits among the plurality of switch protection circuits form a switch protection circuit group , correspondingly, the open and close states of all the switch protection circuits in any one of the switch protection circuit groups are the same, and the multiple switch protection circuit groups correspond to different safety levels.

In a second aspect, an embodiment of the present utility model provides a battery energy storage system, including the power supply protection device described in any one of the above-mentioned first aspects.

In a third aspect, an embodiment of the present utility model provides an electrical device, including the power supply protection device described in any one of the above-mentioned first aspects.

In related technologies, when the power supply switch relay is turned off, since the maximum capacity of the power supply switch relay to disconnect the current is certain, when the current passing through the power supply switch relay is too large, it even exceeds its maximum capacity to disconnect the current. When the current is too high, the power supply switch relay is likely to be difficult to disconnect, resulting in sticking.

For the above technical solution, in view of this technical problem, a switch protection circuit can be connected in parallel with the power supply switch relay. The switch protection circuit includes a protection switch and a shunt element. When the power supply switch relay is closed and the power supply device is discharging, the protection switch of the switch protection circuit is disconnected, then, when the power supply switch relay needs to be disconnected, the protection switch of the switch protection circuit can be closed first to make the protection circuit conduct. The current is then partially shunted by the shunt element, thereby reducing the current through the supply switching relay. Since the maximum capacity of the power supply switch relay to disconnect the current is certain, the smaller the current passing through the power supply switch relay, the greater the probability that the power supply switch relay can be successfully disconnected. Finally, after the power supply switch relay 104 is turned off, the protection switch 1062 is turned off, so as to stop the power supply smoothly.

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

【Description of drawings】

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 shows a schematic diagram of circuit links of a power supply protection device according to an embodiment of the present invention;

Fig. 2 shows a schematic diagram of circuit links of a power supply protection device according to another embodiment of the present invention;

Fig. 3 shows the block diagram of the battery energy storage system of an embodiment of the present invention;

Fig. 4 shows a block diagram of an electrical device according to an embodiment of the present invention.

【detailed description】

In order to better understand the technical solution of the utility model, the embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include plural forms unless the context clearly indicates otherwise.

Fig. 1 shows a schematic diagram of circuit links of a power supply protection device according to an embodiment of the present invention.

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

The first end of the power supply switch relay 104 is connected to the output end of the power supply device 102, and the second end of the power supply switch relay 104 is connected to the load; the switch protection circuit 106 is connected in parallel with the power supply switch relay 104, and the switch protection circuit 106 Including a protection switch 1062 and a shunt element 1064, the protection switch 1062 is connected in series with the shunt element 1064, wherein one end of the protection switch 1062 is connected to the power supply 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 connected to the second end of the power supply switch relay 104 .

In the above technical solution, a switch protection circuit 106 can be connected in parallel with 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 discharging, the switch protection circuit 106 The protection switch 1062 is disconnected. Then, when the power supply switch relay 104 needs to be disconnected, the protection switch 1062 of the switch protection circuit 106 can be closed first, so that the protection circuit is turned on. Since there is a shunt element 1064 in the protection circuit, the protection circuit conducts After being turned on, the original current flowing out of the power supply device 102 is partly shunted by the shunt element 1064 , thereby reducing the current passing through the power supply switch relay 104 . Since the maximum capability of the power supply switch relay 104 to disconnect the current is certain, the smaller the current passing through the power supply switch relay 104, the greater the probability that the power supply switch relay 104 can be successfully disconnected. Finally, after the power supply switch relay 104 is turned off, the protection switch 1062 is turned off, so as to stop the power supply smoothly.

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

The power supply device 102 includes several battery modules, and each battery module is formed by several batteries connected in parallel. That is to say, the present invention is mainly applied in the case of huge power supply current, and the more battery modules in the power supply device 102, the greater its power supply capacity.

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

The shunt element 1064 can be a resistor, or any other element with resistance. As long as the resistance can shunt the original current flowing from the power supply device 102, the probability of successfully disconnecting the power supply switch relay 104 can be improved.

In an implementation manner of the present invention, the resistor is a fixed resistance resistor, and the shunt capacity corresponding to the fixed resistance resistor is also fixed.

In another implementation manner of the present utility model, the resistor is an adjustable resistor. because:

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 1.1kA, when the resistance of the shunt element is adjusted to 1k ohms, the current through the power supply switch relay 104 is shunted and reduced to 1kA, when the shunt When the resistance of the element is adjusted to 2.1k ohms, the current through the power supply switch relay 104 is shunted and reduced to 0.5kA. That is to say, the actual shunt capacity of the switch protection circuit 106 can be adjusted by changing the resistance value of the resistor, so that the adjustment of the power supply switch relay 104 and even the whole system is more flexible. Of course, the resistance and current parameters of each component in an actual scene are not limited to the above examples.

It needs to be added that yes, the load connected to the second end of the power supply switch relay 104 may be any equipment requiring electric energy, a hydropower station, and the like.

The technical solution of the utility model is described in another way below.

First, the battery management unit receives the power supply stop information, so it can close the protection switch 1062 according to the power supply stop information, so that the switch protection circuit 106 is accessible. At this time, according to the power supply stop information, the power supply switch relay 104 is disconnected, when After the switch relay 104 is successfully disconnected, that is, when it is detected that the current of the branch circuit where the power supply switch relay 104 is located is zero, the protection switch 1062 is turned off according to the power supply stop information, and finally the purpose of power supply stop is realized. Wherein, when the resistance of the shunt element 1064 is adjustable, its resistance can be adjusted through the battery management unit, for example, different resistance options can be set on the operation interface of the battery management unit for the user to choose.

Fig. 2 shows a schematic diagram of circuit links of a power supply protection device according to another embodiment of the present invention.

As shown in Figure 2, the power supply switch relay 104 is connected in parallel with one or more of the switch protection circuits 106, and multiple switch protection circuits 106 perform current shunting at the same time, which can realize a stronger shunt capacity, thereby further reducing the power flow through the power supply switch relay 104. The current increases the probability that the power supply switch relay 104 is successfully disconnected. Three switch protection circuits 106 are schematically shown in FIG. 2 , but in actual situations, the number of switch protection circuits 106 is not limited thereto.

Based on this, in an implementation of the present invention, the resistance of the shunt element 1064 of each of the switch protection circuits 106 is the same, and any number of switch protection circuits 106 among the plurality of switch protection circuits 106 form a For the group of switch protection circuits 106, all the switch protection circuits 106 in any one group of switch protection circuits 106 have the same on-off status. Correspondingly, multiple groups of switch protection circuits 106 correspond to different safety levels.

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

In addition, in another implementation manner of the present invention, the shunt elements 1064 of each switch protection circuit 106 have different resistances, and correspondingly, multiple switch protection circuits 106 have different safety levels. In this way, the user can select different switch protection circuits 106 according to actual needs, so as to obtain different degrees of safety protection.

Fig. 3 shows a block diagram of a battery energy storage system according to an embodiment of the present invention.

As shown in FIG. 3 , an embodiment of the present invention provides a battery energy storage system 300 , including the power supply protection device 100 described in any one of the embodiments in FIG. 1 and FIG. 2 . Therefore, the battery energy storage system 300 has the same technical effect as that of the power supply protection device 100 described in any one of the embodiments in FIG. 1 and FIG. 2 , which will not be repeated here.

Fig. 4 shows a block diagram of an electrical device according to an embodiment of the present invention.

As shown in FIG. 4 , an embodiment of the present invention provides an electrical device 400 , including the power supply protection device 100 described in any one of the embodiments in FIG. 1 and FIG. 2 . Therefore, the electric device 400 has the same technical effect as that of the power supply protection device 100 described in any one of the embodiments in FIG. 1 and FIG. 2 , which will not be repeated here.

The technical solution of the utility model has been described in detail above in conjunction with the accompanying drawings. Through the technical solution of the utility model, the possibility of sticking of the power supply switch relay is reduced, making the power supply switch relay safer and more effective, thereby greatly improving the safety of the power supply device. safety.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the utility model.

Claims (10)

1. A kind of 1. power supply protection device, it is characterised in that including：

   Electric supply installation；

   Power switch relay, the first end of the power switch relay is connected to the output end of the electric supply installation, described Second end of power switch relay is connected to load；

   Switch protecting circuit, the switch protecting circuit include protection switch and vent diverter, the protection switch with described point Fluid element is connected, wherein, one end of the protection switch is connected to the power switch relay, the protection switch it is another End is connected to one end of the vent diverter, the second end phase of the other end of the vent diverter and the power switch relay Even.
2. 2. power supply protection device according to claim 1, it is characterised in that the electric supply installation includes several battery moulds Group, each battery modules are formed by several cell parallels.
3. 3. power supply protection device according to claim 1, it is characterised in that the protection switch is relay.
4. 4. power supply protection device according to claim 1, it is characterised in that the vent diverter is resistance.
5. 5. power supply protection device according to claim 4, it is characterised in that the resistance is resistance fixed resistance or resistance Adjustable resistance.
6. 6. power supply protection device according to any one of claim 1 to 5, it is characterised in that the power switch relay Device is parallel with one or more switch protecting circuits.
7. 7. power supply protection device according to claim 6, it is characterised in that the shunting member of each switch protecting circuit The resistance sizes of part are different；

   Accordingly, multiple switch protecting circuits are corresponding with different safe classes respectively.
8. 8. power supply protection device according to claim 6, it is characterised in that the shunting member of each switch protecting circuit The resistance sizes of part are identical, and

   Several switch protecting circuits are appointed to form a switch protecting circuit group in multiple switch protecting circuits；

   The open and-shut mode of all switch protecting circuits is identical in any switch protecting circuit group, correspondingly, multiple described to open Close protection circuit group and be corresponding with different safe classes respectively.
9. 9. a kind of battery energy storage system, it is characterised in that including the power supply protection dress as any one of claim 1 to 8 Put.
10. 10. a kind of electrical equipment, it is characterised in that including the power supply protection device as any one of claim 1 to 8.