Control circuit of multi-branch large-current energy storage system

Abstract

The utility model relates to the technical field of new energy, and particularly discloses a control circuit of a multi-branch large-current energy storage system, which comprises a battery control unit, a control unit and a power supply unit, the plurality of communication interfaces are connected with the battery control unit; the first input interface is connected with the first battery cluster and the power bus, and the power bus is connected with the first output interface; the second input interface is connected with the second battery cluster and the power bus, and the power bus is connected with the second output interface; the first input interface and the second input interface are connected in parallel on the power bus, and the first output interface and the second output interface are connected in parallel on the power bus. A new control circuit is designed, and a plurality of battery clusters are allowed to be accessed, so that the space occupation of the multi-cluster energy storage system is effectively reduced, meanwhile, the stable and reliable energy storage system is provided, and the actual requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially, relate to a kind of control circuit of multi-branch large current energy storage system. BACKGROUND

[0002] With the continuous development of new energy technology, energy storage battery system is more and more widely used in the field of electric power, transportation and other fields. In order to improve the reliability and efficiency of energy storage battery system, an integrated high-voltage power distribution system is needed to realize the reasonable power distribution and management of energy storage unit.

[0003] In the prior art, in order to reduce the production cost, standard energy storage unit is often used, each standard energy storage unit is configured with corresponding PDU (Power Distribution Unit, power distribution unit), when a standard energy storage unit cannot meet the actual demand, multiple PDU is configured.

[0004] However, in the actual application process, with the increasing application scenarios of energy storage unit, the existing configuration mode cannot meet the actual demand, multiple sets of energy storage unit need to be configured with multiple PDU, which needs to occupy additional space, thereby reducing the space utilization of energy storage unit, and in the application scenario of insufficient space resource, the manageable energy size is limited. UTILITY MODEL CONTENT

[0005] In order to overcome the above technical problems existing in the prior art, the utility model embodiment provides a kind of control circuit of multi-branch large current energy storage system, by designing a new control circuit, allow access multiple battery clusters, thereby effectively reducing the space occupation of multi-cluster energy storage system, while providing stable, reliable energy storage system, meet the actual demand.

[0006] In order to achieve the above purpose, the utility model embodiment provides a kind of control circuit of multi-branch large current energy storage system, the control circuit of multi-branch large current energy storage system includes: battery control unit;Multiple communication interfaces are connected with the battery control unit;First input interface is connected with first battery cluster and power bus, and the power bus is connected with first output interface;Second input interface is connected with second battery cluster and power bus, and the power bus is connected with second output interface;The first input interface and the second input interface are connected in parallel on the power bus, and the first output interface and the second output interface are connected in parallel on the power bus.

[0007] Preferably, the first input interface comprises a first input positive electrode interface and a first input negative electrode interface, the second input interface comprises a second input positive electrode interface and a second input negative electrode interface, the power bus comprises a positive electrode power bus and a negative electrode power bus; a first relay is arranged between the first input positive electrode interface and the positive electrode power bus, and a second relay is arranged between the second input positive electrode interface and the positive electrode power bus; the first output interface comprises a first output positive electrode interface and a first output negative electrode interface, and the second output interface comprises a second output positive electrode interface and a second output negative electrode interface; a third relay is arranged between the first output positive electrode interface and the positive electrode power bus, and a fourth relay is arranged between the second output positive electrode interface and the positive electrode power bus; a fifth relay is arranged between the first output negative electrode interface and the negative electrode power bus, and a sixth relay is arranged between the second output negative electrode interface and the negative electrode power bus.

[0008] Preferably, a first pre-charging circuit is arranged in parallel with the first relay, and a second pre-charging circuit is arranged in parallel with the second relay.

[0009] Preferably, the first pre-charging circuit comprises a first direct-current fuse, a first switch and a first pre-charging resistor connected in series, and the second pre-charging circuit comprises a second direct-current fuse, a second switch and a second pre-charging resistor connected in series.

[0010] Preferably, a third fuse is arranged on the positive electrode power bus, and a shunt is arranged on the negative electrode power bus, and the shunt is connected with the battery control unit.

[0011] Preferably, a third pre-charging circuit is arranged in parallel with the third relay.

[0012] Preferably, the third pre-charging circuit comprises a third switch and a third pre-charging resistor.

[0013] Preferably, the first battery cluster and the second battery cluster each comprise a plurality of semi-solid batteries.

[0014] By the technical scheme provided by the utility model, the utility model has at least the following technical effects: by designing a new control circuit of a multi-branch large-current energy storage system, adopting semi-solid batteries to form battery clusters, and allowing multiple battery clusters to be connected for unified management, the space occupation of the multi-cluster energy storage system is effectively reduced, and the energy density of the energy storage system is improved; meanwhile, by the multi-branch circuit design, the circulating current problem existing when the multi-cluster batteries are connected in parallel to the control circuit is solved, the normal use of the batteries is protected, and the use safety of the energy storage system is improved.

[0015] Other features and advantages of the embodiments of the utility model will be described in detail in the following specific embodiments. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the control circuit of the multi-branch high-current energy storage system provided in this embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the connection between the input interface and the output interface and the power bus provided in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the connection between the input interface and the output interface and the power bus provided in the second embodiment of this utility model. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0021] In this embodiment of the invention, the terms "system" and "network" are used interchangeably. "Multiple" refers to two or more; therefore, in this embodiment, "multiple" can also be understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, it should be understood that in the description of this embodiment of the invention, words such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0022] Please see Figure 1The utility model embodiment provides a kind of control circuit of multi-branch large current energy storage system, the control circuit of multi-branch large current energy storage system includes: battery control unit;Multiple communication interfaces are connected with the battery control unit;First input interface is connected with first battery cluster and power bus, and the power bus is connected with first output interface;Second input interface is connected with second battery cluster and power bus, and the power bus is connected with second output interface;The first input interface and the second input interface are connected in parallel on the power bus, and the first output interface and the second output interface are connected in parallel on the power bus.

[0023] In a possible implementation, the control circuit of multi-branch large current energy storage system includes a battery control unit, for example, a battery management system (BMS) master control board for comprehensive control of multi-branch battery clusters. Multiple communication interfaces are provided in the control circuit of multi-branch large current energy storage system and connected with the battery control unit. The communication interfaces include, but are not limited to, a battery pack internal communication interface CN_SUB for communication with the inside of the battery pack, an external communication input interface CN_CANIN and an external communication output interface CN_CANOUT for communication with the outside of the battery pack, and the like. In the specific implementation process, the external terminal device or control center can send control instructions to the battery control unit through the above-mentioned external communication interfaces, and the battery control unit executes control operations for the energy storage system according to the control instructions.

[0024] On this basis, other basic function interfaces can also be configured in the control circuit of multi-branch large current energy storage system, such as an external control interface for connecting a start switch and a display screen, a reset interface for connecting a self-reset switch, a debugging interface for internal adjustment, and a dry node interface for connecting a dry node relay, and the like. Further, in order to meet the actual needs of the energy storage system, an emergency stop switch and a 24V input interface can also be configured, which will not be described in detail here.

[0025] In the specific implementation process, the first battery cluster is connected with the power bus in the control circuit of multi-branch large current energy storage system through the first input interface, and the second battery cluster is connected with the power bus through the second input interface. The first input interface and the second input interface are connected in parallel on the power bus, for example, the first input interface is connected with the power bus through a first conductive row, and the second input interface is connected with the power bus through a second conductive row. At the same time, the power bus is also connected with the first output interface and the second output interface, and the first output interface and the second output interface are also connected in parallel on the power bus.

[0026] Therefore, the parallel connection of multiple battery clusters is realized, the first input interface and the power bus form a first branch corresponding to the first battery cluster, and the second input interface and the power bus form a second branch corresponding to the second battery cluster. It is easy for those skilled in the art to know that due to various factors such as physical properties and use environment, there is a voltage difference between the first battery cluster and the second battery cluster during use. At this time, the parallel connection will inevitably lead to the generation of circulating current between the battery clusters. Therefore, by connecting a resistance with a cluster equalization power function in each branch, when the battery control unit monitors that there is a voltage difference between the two battery clusters, the resistance is automatically discharged to the high voltage to keep the voltage of the two battery clusters consistent or close, thereby protecting the service life of the battery cell.

[0027] Further, in order to meet the demand of larger input / output current, in the embodiment of the utility model, the first battery cluster and the second battery cluster are both composed of multiple semi-solid batteries. Preferably, the semi-solid battery is a semi-solid battery with a capacity of 125Ah, such as model 1DL1G9_33200169-125Ah.

[0028] In the embodiment of the utility model, by connecting multiple battery clusters to the control circuit of the unified multi-branch large current energy storage system, only one control circuit and the corresponding cabinet are allowed for multiple battery clusters, thereby effectively reducing the space occupation of the multi-branch large current energy storage system and improving the space utilization. At the same time, through the cluster equalization power resistance, the battery management unit can control the circulating current between the battery clusters, thereby effectively protecting the service life of the battery cell and improving the battery safety. Further, by using the battery cluster composed of semi-solid batteries, the input / output current of the battery cluster can be greatly improved, allowing 2C or even 3C large current charging and discharging operation, thereby meeting the demand of large current.

[0029] In practical application, on the one hand, the voltage difference between different battery clusters will lead to the appearance of large current circulating current, which may cause damage to the battery; on the other hand, during the charging process, the use difference of different battery clusters will also lead to overcharge or overdischarge of part of the battery, which will affect the service life and capacity of the battery; thirdly, during the charging and discharging process of the energy storage system, if the capacitive load connected is more, the large current during starting may cause damage to the electrical equipment or relay, etc., therefore it cannot meet the actual demand.

[0030] Please refer to Figure 2In the embodiment of the utility model, the first input interface includes first input positive pole interface and first input negative pole interface, the second input interface includes second input positive pole interface and second input negative pole interface, the power bus includes positive pole power bus and negative pole power bus;First relay is arranged between the first input positive pole interface and the positive pole power bus, second relay is arranged between the second input positive pole interface and the positive pole power bus;The first output interface includes first output positive pole interface and first output negative pole interface, and the second output interface includes second output positive pole interface and second output negative pole interface;Third relay is arranged between the first output positive pole interface and the positive pole power bus, and fourth relay is arranged between the second output positive pole interface and the positive pole power bus;Fifth relay is arranged between the first output negative pole interface and the negative pole power bus, and sixth relay is arranged between the second output negative pole interface and the negative pole power bus.

[0031] Further, in the embodiment of the utility model, first pre-charge circuit is arranged in parallel with the first relay, and second pre-charge circuit is arranged in parallel with the second relay.

[0032] In the embodiment of the utility model, the first pre-charge circuit includes first DC fuse, first switch and first pre-charge resistance connected in series, and the second pre-charge circuit includes second DC fuse, second switch and second pre-charge resistance connected in series.

[0033] In a possible implementation, first relay and second relay are arranged between first input positive pole interface and second input positive pole interface and positive pole power bus respectively, to control the communication state between each input positive pole interface and power bus, and third relay and fourth relay are arranged between first output positive pole interface and second output positive pole interface and positive pole power bus respectively, and fifth relay and sixth relay are arranged between first output negative pole interface and second output negative pole interface and negative pole power bus. By configuring relays on the input end and the output end, when the relays at any end stick due to large current or service life, the normal opening or closing of the battery circuit in the energy storage system can be effectively ensured, and the use safety of the energy storage system is ensured.

[0034] Meanwhile, when charging or discharging, after the battery control unit detects that the voltage difference between the battery clusters is greater than the preset value, the battery cluster with higher voltage can be controlled to discharge first, or the battery cluster with lower voltage can be controlled to charge first, and when the voltages of the two battery clusters reach or approach each other, the charging and discharging branches of the two battery clusters are connected at the same time, so that stable and reliable charging and discharging operation is realized, and the service life of the battery cluster is effectively protected.

[0035] On this basis, a first pre-charging circuit is arranged in parallel with the first relay at the input end, and a second pre-charging circuit is arranged in parallel with the second relay.

[0036] In the embodiment of the utility model, through configuring corresponding pre-charging circuit for each battery cluster, corresponding control strategy can be adopted according to the actual condition of each battery cluster to realize the charging and discharging operation of multi-branch large current or realize the protection function of battery cluster, ensure that each battery cluster in the whole energy storage system is inputted / outputted with consistent parameters, and the safety and service life are improved.

[0037] In the embodiment of the utility model, a third fuse is arranged on the positive power bus, and a shunt is arranged on the negative power bus, and the shunt is connected with the battery control unit.

[0038] By arranging the third fuse on the positive power bus, the energy storage system is further protected, and the input / output of short circuit or large current is avoided to cause damage to the energy storage system, and the shunt can provide current detection data for the battery control unit to provide data basis for accurate control of the energy storage system.

[0039] In actual application process, in order to avoid the influence of the transient large current generated by a large number of capacitive loads in the load at the start time on the energy storage system or the electric load, a third pre-charging circuit is arranged in parallel with the third relay at the output end to pre-charge the load before power supply, and the damage of the transient large current to the load is avoided.

[0040] Please refer to Figure 3 In the embodiment of the utility model, a third pre-charging circuit is arranged in parallel with the third relay.

[0041] In the embodiment of the utility model, the third pre-charging circuit includes a third switch and a third pre-charging resistor.

[0042] In a possible implementation, by configuring a third pre-charge circuit at the output end, before the load needs to be powered, if the capacitive load in the load is more, the battery control unit can first turn on a third switch in the third pre-charge circuit, slowly discharges the complex under the action of a third pre-charge resistor, pre-charges the complex, and then turns off the third switch, and turns off a third relay and / or a fourth relay, to supply the electrical energy in the battery cluster to the load.

[0043] In the embodiment of the utility model, through adopting multiple branch parallel access multiple battery clusters, multiple battery clusters are allowed to share one battery master control cabinet, thereby effectively reducing the space occupation of the master control cabinet, saving space, improving the energy storage density, and meeting the actual needs of enterprises. At the same time, by adopting the double-branch separate control mode, the circulating current problem between the multiple parallel battery clusters is effectively solved, and the application value is high.

[0044] The optional implementation of the embodiment of the utility model is described in detail above in combination with the drawings, but the embodiment of the utility model is not limited to the specific details in the above implementation, and various simple modifications can be made to the technical scheme of the embodiment of the utility model within the technical concept of the embodiment of the utility model, and these simple modifications all belong to the protection scope of the embodiment of the utility model.

[0045] In addition, it should be noted that various specific technical features described in the above specific implementation can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combination manners are not described again in the embodiment of the utility model.

[0046] In addition, various different embodiments of the embodiment of the utility model can also be combined arbitrarily, as long as it does not deviate from the idea of the embodiment of the utility model, and it should also be considered as the disclosed content of the embodiment of the utility model.

Claims

1. A control circuit for a multi-branch high-current energy storage system, characterized in that, The control circuit of the multi-branch high-current energy storage system includes: Battery control unit; Multiple communication interfaces are connected to the battery control unit; The first input interface is connected to the first battery cluster and the power bus, and the power bus is connected to the first output interface; The second input interface is connected to the second battery cluster and the power bus, and the power bus is connected to the second output interface; The first input interface and the second input interface are connected in parallel on the power bus, and the first output interface and the second output interface are connected in parallel on the power bus.

2. The control circuit of the multi-branch high-current energy storage system according to claim 1, characterized in that, The first input interface includes a first positive input interface and a first negative input interface; the second input interface includes a second positive input interface and a second negative input interface; and the power bus includes a positive power bus and a negative power bus. A first relay is provided between the first input positive interface and the positive power bus, and a second relay is provided between the second input positive interface and the positive power bus; The first output interface includes a first positive output interface and a first negative output interface, and the second output interface includes a second positive output interface and a second negative output interface; A third relay is provided between the first output positive interface and the positive power bus, and a fourth relay is provided between the second output positive interface and the positive power bus; A fifth relay is provided between the first output negative interface and the negative power bus, and a sixth relay is provided between the second output negative interface and the negative power bus.

3. The control circuit of the multi-branch high-current energy storage system according to claim 2, characterized in that, A first pre-charge circuit is configured in parallel with the first relay, and a second pre-charge circuit is configured in parallel with the second relay.

4. The control circuit of the multi-branch high-current energy storage system according to claim 3, characterized in that, The first precharge circuit includes a first DC fuse, a first switch, and a first precharge resistor connected in series, and the second precharge circuit includes a second DC fuse, a second switch, and a second precharge resistor connected in series.

5. The control circuit of the multi-branch high-current energy storage system according to claim 4, characterized in that, A third fuse is installed on the positive power bus, and a shunt is installed on the negative power bus. The shunt is connected to the battery control unit.

6. The control circuit of the multi-branch high-current energy storage system according to claim 2, characterized in that, A third pre-charge circuit is provided in parallel with the third relay.

7. The control circuit of the multi-branch high-current energy storage system according to claim 6, characterized in that, The third pre-charge circuit includes a third switch and a third pre-charge resistor.

8. The control circuit of the multi-branch high-current energy storage system according to claim 1, characterized in that, Both the first battery cluster and the second battery cluster are composed of multiple semi-solid batteries.

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