High-voltage distribution box for energy storage

Abstract

The utility model relates to the technical field of power distribution boxes, and discloses a high-voltage power distribution box for energy storage, which comprises a power distribution box body and a power distribution box cover, and an anode loop, a cathode loop and a battery management system are arranged in the power distribution box body. The positive pole loop comprises a positive pole relay and positive pole energy storage connectors which are arranged on two sides and used for being connected with a power supply positive pole, a load or a positive pole of an energy storage battery; the negative pole loop comprises a negative pole relay and negative pole energy storage connectors which are arranged on two sides and used for being connected with a power supply negative pole, a load or a negative pole of the energy storage battery; a fuse and a current detection element are arranged in the positive loop and / or the negative loop, the positive relay and the negative relay are both in signal connection with the battery management system, and the battery management system is used for controlling the on-off state of the positive relay and the negative relay. The battery management system is integrated in the distribution box body, the structure is simple, the cost is low, the positive and negative relays and the battery management system do not need to be connected and debugged during assembly, and assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution boxes, and more specifically, to a high-voltage distribution box for energy storage. Background Art

[0002] At present, only a positive circuit and a negative circuit are usually provided in a high-voltage distribution box, and a battery management system (Battery Management System, abbreviated as BMS) for controlling the on / off of the positive and negative circuits is arranged outside the high-voltage distribution box. In order to ensure the normal operation of the battery management system, an additional protective housing needs to be configured for the battery management system, and the protective housing is installed and fixedly connected outside the high-voltage distribution box or other devices of the power distribution system, which not only makes the assembly complex, increases the equipment cost, but also requires a larger installation space.

[0003] In summary, how to reduce the equipment cost of the high-voltage distribution box and improve the assembly efficiency is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a high-voltage distribution box for energy storage, which integrates a battery management system in the distribution box body, has a simple structure and low cost, and does not need to connect and debug the positive and negative relays and the battery management system during assembly, which is convenient for assembly.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-voltage distribution box for energy storage, including a distribution box body and a distribution box cover, wherein a positive circuit, a negative circuit and a battery management system are arranged in the distribution box body, the positive circuit includes a positive relay and positive energy storage connectors on both sides for connecting with the positive power supply, load or positive electrode of the energy storage battery, and the negative circuit includes a negative relay and negative energy storage connectors on both sides for connecting with the negative power supply, load or negative electrode of the energy storage battery;

[0007] A fuse and a current detection element are arranged in the positive circuit and / or the negative circuit, the positive relay and the negative relay are both signal-connected to the battery management system, and the battery management system is used to control the on / off states of the positive relay and the negative relay.

[0008] Preferably, the fuse is arranged between the positive energy storage connector and the positive relay, and copper bars are used for connection between the positive energy storage connector and the fuse, between the fuse and the positive relay, and between the positive relay and the positive energy storage connector;

[0009] The current detection element includes a shunt, which is provided between the negative energy storage connector and the negative relay. The copper busbars are used for connection between the negative energy storage connector and the shunt, between the shunt and the negative relay, and between the negative relay and the negative energy storage connector.

[0010] Preferably, the copper busbar is connected to the distribution box body through an insulating column, and the insulating column is bolted to the distribution box body through a connecting stud with pre-pressed riveting.

[0011] Preferably, it further includes a switching power supply for supplying power to the battery management system. Both the positive relay and the negative relay are connected to the battery management system through low-voltage wire harnesses, and the battery management system is connected to the switching power supply through the low-voltage wire harnesses.

[0012] Preferably, a sheet metal bridge for clamping and fixing the low-voltage wire harness is provided inside the distribution box body, and the sheet metal bridge is integrally formed with the distribution box body.

[0013] Preferably, the positive circuit and the negative circuit are respectively arranged close to the opposite side surfaces of the distribution box body.

[0014] Preferably, the battery management system is arranged between the positive circuit and the negative circuit.

[0015] Preferably, the battery management system is arranged close to the side plate of the distribution box body.

[0016] Preferably, a plurality of heat dissipation holes are provided on the side surface of the distribution box body, and the heat dissipation holes are evenly arranged along the height direction and the side plate extension direction of the distribution box body.

[0017] Preferably, it further includes a temperature sensor, a heat dissipation fan and a fan relay. The temperature sensor for monitoring the internal temperature of the distribution box is provided at the heat dissipation hole.

[0018] The high-voltage distribution box for energy storage provided by the present utility model integrates a battery management system inside the distribution box body. The battery management system is used to control the on-off of the positive relay and the negative relay, and further control the on-off of the positive circuit and the negative circuit, so as to realize the control of charging and discharging.

[0019] Compared with the case where the battery management system is separately arranged outside the high-voltage distribution box, the protective shell of the battery management system is omitted, the structure is simple and the cost is lower. Moreover, when assembling, there is no need to connect and debug the positive and negative relays and the battery management system, which significantly simplifies the assembly process and improves the assembly efficiency. Description of the Drawings

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A structural schematic diagram of a specific embodiment of a high-voltage distribution box for energy storage provided by the utility model;

[0022] Figure 2 This is a top view diagram after removing the distribution box cover.

[0023] Figure 1 - Figure 2 middle:

[0024] 1-distribution box body; 101-heat dissipation hole; 102-sheet metal bridge; 2-distribution box cover; 3-positive energy storage connector; 4-fuse; 5-positive relay; 6-negative energy storage connector; 7-shunt; 8-negative relay; 9-copper busbar; 10-insulating column; 11-battery management system; 12-switching power supply; 13-fan relay, 14-terminal block; 15-DIN rail; 16-low-voltage wiring harness, 17-through-the-wall terminal. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The core of the utility model is to provide a high-voltage distribution box for energy storage, in which a battery management system is integrated into the box body. It has a simple structure and low cost. During assembly, there is no need to connect and debug the positive and negative relays and the battery management system, which is convenient for assembly.

[0027] The utility model provides a high-voltage distribution box for energy storage, including a distribution box body 1 and a distribution box cover 2. The distribution box body 1 is provided with a positive circuit, a negative circuit and a battery management system 11. The positive circuit includes a positive relay 5 and positive energy storage connectors 3 on both sides for connecting to a power supply motor, a load or a positive electrode of an energy storage battery. The negative circuit includes a negative relay 8 and negative energy storage connectors 6 on both sides for connecting to a negative power supply electrode, a load or a negative electrode of an energy storage battery.

[0028] A fuse 4 and a current detection element are provided in the positive electrode circuit and / or the negative electrode circuit. The positive electrode relay 5 and the negative electrode relay 8 are both connected to the battery management system 11 for signal connection, and the battery management system 11 is used to control the on-off states of the positive electrode relay 5 and the negative electrode relay 8.

[0029] Wherein, the distribution box cover 2 is detachably provided on the top of the distribution box body 1 so as to enclose the installation space of the high-voltage distribution box; the specific structures, dimensions, connection methods, etc. of the distribution box body 1 and the distribution box cover 2 are determined with reference to the prior art according to actual production requirements.

[0030] In order to ensure the grounding safety of the high-voltage distribution box, preferably, grounding bolts are pre-pressed and riveted on at least two side plates of the distribution box body 1, which facilitates the distribution box body 1 to connect the grounding wire at different positions and provides double or even multiple grounding protections.

[0031] The high-voltage distribution box is provided with a positive electrode circuit and a negative electrode circuit, which are used to form a charge and discharge circuit in cooperation with an energy storage battery, a power supply or a load; please refer to Figure 2 , both ends of the positive electrode circuit are positive electrode energy storage connectors 3. One end of the positive electrode energy storage connector 3 is connected to the positive electrode of the energy storage battery, and the other end of the positive electrode energy storage connector 3 is connected to the positive power supply or the load. A positive electrode relay 5 is provided between the two positive electrode energy storage connectors 3, and the on-off state of the positive electrode relay 5 can control the on-off state of the positive electrode circuit;

[0032] Both ends of the negative electrode circuit are negative electrode energy storage connectors 6. One end of the negative electrode energy storage connector 6 is connected to the negative electrode of the energy storage battery, and the other end of the negative electrode energy storage connector 6 is connected to the negative power supply or the load. A negative electrode relay 8 is provided between the two negative electrode energy storage connectors 6, and the on-off state of the negative electrode relay 8 can control the on-off state of the negative electrode circuit.

[0033] The specific types and models of the positive electrode energy storage connector 3, the negative electrode energy storage connector 6, the positive electrode relay 5 and the negative electrode relay 8 are determined with reference to the prior art according to actual high-voltage distribution requirements;

[0034] It should be noted that considering that both the positive electrode circuit and the negative electrode circuit are high-voltage circuits, the positive electrode relay 5 and the negative electrode relay 8 are usually set as high-voltage DC relays.

[0035] When the high-voltage distribution box is connected to the power supply and the energy storage battery, the battery management system 11 controls the positive and negative relays to conduct, so that both the positive electrode circuit and the negative electrode circuit are connected, and a complete charging circuit is formed between the power supply and the energy storage battery, and the power supply charges the energy storage battery;

[0036] When the high-voltage distribution box is connected to the energy storage battery and the load, the battery management system 11 controls the positive and negative relays to conduct, so that the positive electrode circuit and the negative electrode return circuit are both connected, forming a complete discharge circuit between the energy storage battery and the load, and the energy storage battery discharges the load.

[0037] The fuse 4 is connected in series in the positive electrode circuit and / or the negative electrode circuit. When the current in the charge and discharge circuit exceeds the specified value, the fuse 4 automatically fuses and cuts off the current to ensure the safe operation of the charge and discharge circuit;

[0038] Current detection elements, such as shunt 7, Hall current sensor, etc., are connected in series in the positive electrode circuit and / or the negative electrode circuit, and are used to detect the magnitude of the charge and discharge current in the charge and discharge circuit, so as to monitor the charge and discharge state of the energy storage battery.

[0039] The specific types and models of the fuse 4 and the current detection element are determined according to the actual high-voltage distribution requirements, which will not be elaborated here; the components in the positive electrode circuit and the negative electrode circuit can be connected through high-voltage wire harnesses or copper bars 9, etc.

[0040] Both the positive electrode relay 5 and the negative electrode relay 8 are connected to the battery management system 11 in signal, belonging to the control circuit of the high-voltage distribution box. The battery management system 11 can output control signals to the positive and negative relays, and then control the conduction state of the positive and negative relays; considering that the control current of the control circuit is small, the positive and negative relays are mostly connected to the battery management system 11 through low-voltage wire harnesses 16.

[0041] In addition, the battery management system 11 can also be connected to an external controller through a terminal block or a through-wall terminal 17. To facilitate the fixation of the through-wall terminal 17, the through-wall terminal 17 can be installed in the reserved installation hole of the distribution box body 1 through common connecting parts such as fastening bolts.

[0042] In this embodiment, the battery management system 11 is integrated in the distribution box body 1, and the battery management system 11 is used to control the on-off of the positive electrode relay 5 and the negative electrode relay 8, and then control the on-off of the positive electrode circuit and the negative electrode circuit, so as to realize the control of charge and discharge;

[0043] Compared with the case where the battery management system 11 is separately arranged outside the high-voltage distribution box, the protective shell of the battery management system 11 is omitted, the structure is simple and the cost is lower, and there is no need to connect and debug the positive and negative relays and the battery management system 11 during assembly, which significantly simplifies the assembly process and improves the assembly efficiency.

[0044] To reduce the equipment cost of the high-voltage distribution box, usually only one fuse 4 and one current detection element are arranged in the charge and discharge circuit; to reduce the overall volume of the high-voltage distribution box, usually the fuse 4 and the current detection element are arranged on the positive and negative electrode circuits respectively.

[0045] Preferably, please refer to Figure 2 , a fuse 4 is provided between the positive energy storage connector 3 and the positive relay 5. Copper bars 9 are used to connect between the positive energy storage connector 3 and the fuse 4, between the fuse 4 and the positive relay 5, and between the positive relay 5 and the positive energy storage connector 3;

[0046] The current detection element includes a shunt 7. A shunt 7 is provided between the negative energy storage connector 6 and the negative relay 8. Copper bars 9 are used to connect between the negative energy storage connector 6 and the shunt 7, between the shunt 7 and the negative relay 8, and between the negative relay 8 and the negative energy storage connector 6.

[0047] To facilitate the positioning and fixing of the copper bar 9, it can be set that the copper bar 9 is connected to the distribution box body 1 through an insulating column 10, and the insulating column 10 is bolted to the distribution box body 1 through a pre-pressed connecting stud.

[0048] On the basis of the above embodiment, the high-voltage distribution box further includes a switching power supply 12 for supplying power to the battery management system 11. The positive relay 5 and the negative relay 8 are both connected to the battery management system 11 through a low-voltage wire harness 16, and the battery management system 11 is connected to the switching power supply 12 through the low-voltage wire harness 16.

[0049] The switching power supply 12 can be set as a horizontal switching power supply and a rail-mounted switching power supply. Considering problems such as installation space, the switching power supply 12 is mostly set as a rail-mounted switching power supply, which is convenient for installation, adjustment, and occupies less space.

[0050] For example, please refer to Figure 2 , the switching power supply 12, the fan relay 13, and the corresponding terminal block 14 are all installed on the DIN rail 15 (Deutsche Institut für Normung, German Institute for Standardization).

[0051] The low-voltage wire harnesses 16 between the positive and negative relays and the battery management system 11, the low-voltage wire harness 16 between the battery management system 11 and the switching power supply 12, and the low-voltage wire harnesses 16 between the battery management system 11 and the switching power supply 12 and the through-wall terminal 17 and the terminal block 14, etc., can all be fixedly arranged in the distribution box body 1 through a wire groove or a cable tie holder.

[0052] Preferably, to simplify the circuit layout and facilitate the fixing of the low-voltage wire harness 16, it can be set that there is a sheet metal bridge 102 for clamping and fixing the low-voltage wire harness 16 in the distribution box body 1. The sheet metal bridge 102 is integrally formed with the distribution box body 1 and can be formed by sheet metal processing. Compared with integral machine processing or die casting, the production cycle is short and the production cost is low.

[0053] On the basis of the above embodiments, for the convenience of installing and maintaining each component in the distribution box, the positive circuit and the negative circuit can be arranged close to the opposite side surfaces of the distribution box body 1. The above two side surfaces can be either the two side surfaces of the distribution box body 1 in the length direction or the two side surfaces of the distribution box body 1 in the width direction.

[0054] In this embodiment, the positive and negative circuits are respectively arranged close to the opposite side surfaces of the distribution box body 1, which can leave a large amount of installation space between the positive and negative circuits. This not only facilitates the installation and maintenance of the battery management system 11 and other devices, but also helps to simplify the wiring layout in the distribution box.

[0055] Preferably, please refer to Figure 2 , the battery management system 11 is arranged between the positive circuit and the negative circuit, which facilitates the wiring layout between the positive and negative relays and the battery management system 11; further, the switching power supply 12 is also arranged between the positive and negative circuits to facilitate the wiring layout between the battery management system 11 and the switching power supply 12.

[0056] On the basis of the above embodiments, for the convenience of heat dissipation of the battery management system 11, the battery management system 11 can be arranged close to the side plate of the distribution box body 1. Compared with the battery management system 11 being arranged at the center of the distribution box body 1, it can effectively shorten the heat transfer path so that the heat generated when the battery management system 11 works can be quickly discharged through the side surface of the distribution box body 1.

[0057] Preferably, in order to accelerate heat dissipation, several heat dissipation holes 101 can be provided on the side plate of the distribution box body 1. The heat dissipation holes 101 can be set in any geometric shape such as circular or waist-shaped, and the heat dissipation holes 101 are uniformly arranged along the height direction and the extension direction of the side plate of the distribution box body 1.

[0058] The specific quantity, shape, size and distribution of the heat dissipation holes 101 are determined according to the size of the distribution box body 1 in actual production, the heat generation amount when the battery management system 11 works, etc.;

[0059] It should be noted that the size of the heat dissipation holes 101 should not be too large to prevent dust and the like from entering the high-voltage distribution box through the heat dissipation holes 101, thereby ensuring its dust-proof performance.

[0060] On the basis of the above embodiments, in order to better control the internal temperature of the distribution box body 1, a temperature sensor, a cooling fan and a fan relay 13 can also be provided. A temperature sensor for detecting the internal temperature of the distribution box is provided at the heat dissipation hole 101. When the real-time internal temperature measured by the temperature sensor is higher than the preset temperature, the fan relay 13 is turned on and controls the cooling fan to rotate.

[0061] The temperature sensor can be specifically set as a thermosensitive sensor, a thermocouple, etc. Its specific type and model are determined according to the temperature range of the internal temperature of the box during actual use, and the installation method of the temperature sensor is determined with reference to the prior art;

[0062] The model, type, installation position, etc. of the cooling fan need to be determined according to the heat generation amount during the operation of the battery management system 11 and the internal temperature distribution of the power distribution box body 1 during actual production.

[0063] In addition, the temperature sensor can also be signal-connected to an alarm such as a buzzer and an LED, so that the alarm can send an alarm signal when the internal real-time temperature exceeds the preset temperature, reminding the staff to handle the relevant situation in time.

[0064] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0065] The high-voltage power distribution box for energy storage provided by the present utility model has been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A high-voltage distribution box for energy storage, comprising a distribution box body (1) and a distribution box cover (2), characterized in that, Inside the distribution box housing (1), there is a positive circuit, a negative circuit, and a battery management system (11). The positive circuit includes a positive relay (5) and positive energy storage connectors (3) on both sides for connecting to the positive power supply, load, or positive electrode of the energy storage battery. The negative circuit includes a negative relay (8) and negative energy storage connectors (6) on both sides for connecting to the negative power supply, load, or negative electrode of the energy storage battery; In the positive circuit and / or the negative circuit, there are fuses (4) and current detection elements. The positive relay (5) and the negative relay (8) are both signal-connected to the battery management system (11). The battery management system (11) is used to control the on / off states of the positive relay (5) and the negative relay (8).

2. The high-voltage power distribution box for energy storage according to claim 1, wherein There is a fuse (4) between the positive energy storage connector (3) and the positive relay (5). Between the positive energy storage connector (3) and the fuse (4), between the fuse (4) and the positive relay (5), and between the positive relay (5) and the positive energy storage connector (3), copper bars (9) are used for connection; The current detection element includes a shunt (7). There is a shunt (7) between the negative energy storage connector (6) and the negative relay (8). Between the negative energy storage connector (6) and the shunt (7), between the shunt (7) and the negative relay (8), and between the negative relay (8) and the negative energy storage connector (6), copper bars (9) are used for connection.

3. The high-voltage power distribution box for energy storage according to claim 2, wherein, The copper bar (9) is connected to the distribution box housing (1) through an insulating column (10). The insulating column (10) is bolt-connected to the distribution box housing (1) through a pre-pressed connecting stud.

4. The high-voltage power distribution box for energy storage according to claim 1, wherein, It further includes a switching power supply (12) for supplying power to the battery management system (11). The positive relay (5) and the negative relay (8) are both connected to the battery management system (11) through a low-voltage wire harness (16). The battery management system (11) is connected to the switching power supply (12) through the low-voltage wire harness (16).

5. The high-voltage power distribution box for energy storage according to claim 4, characterized in that Inside the distribution box housing (1), there is a sheet metal bridge (102) for clamping and fixing the low-voltage wire harness (16). The sheet metal bridge (102) is integrally formed with the distribution box housing (1).

6. The high-voltage power distribution box for energy storage according to any one of claims 1-5, characterized in that The positive circuit and the negative circuit are respectively arranged close to the opposite side surfaces of the distribution box housing (1).

7. The high-voltage power distribution box for energy storage according to claim 6, characterized in that, The battery management system (11) is arranged between the positive circuit and the negative circuit.

8. The high-voltage power distribution box for energy storage according to any one of claims 1-5, characterized in that, The battery management system (11) is arranged close to the side plate of the distribution box housing (1).

9. The high-voltage power distribution box for energy storage according to claim 8, wherein, On the side surface of the distribution box housing (1), there are several heat dissipation holes (101). The heat dissipation holes (101) are evenly arranged along the height direction and the side plate extension direction of the distribution box housing (1).

10. The high-voltage power distribution box for energy storage according to claim 9, characterized in that, It further includes a temperature sensor, a cooling fan, and a fan relay (13). The temperature sensor for monitoring the internal temperature of the distribution box is arranged at the heat dissipation holes (101).

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