High-voltage control box of battery system

Abstract

The utility model discloses a high-voltage control box of a battery system, which comprises a box body, an electric device assembly, a battery interface assembly, an output interface assembly and a copper bar assembly, the electric device assembly is fixedly arranged in the box body, and the battery interface assembly and the output interface assembly are both embedded on the box body. The electric device assembly is electrically connected with the battery interface assembly and the output interface assembly through the copper bar assembly. The electric device assembly comprises a plurality of branch assemblies, each branch assembly comprises a fuse, a branch contactor and a current detector which are electrically connected in sequence, the fuse is electrically connected with the battery interface assembly, and the current detector is electrically connected with the main positive contactor. Through the application of the high-voltage control box, the high-voltage control box suitable for the battery system in which multiple groups of battery packs are connected in parallel is provided, and the on-off of loops of the battery packs connected in parallel and the disconnection fault of the battery packs are realized through adding independent fuses, contactors and current sensors to the battery pack branches connected in parallel. And the damage to the battery system caused by the circulating current is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery packs, and in particular to a high-voltage control box for a battery system. Background Art

[0002] At present, the design of battery packs for new energy heavy-duty commercial vehicles often requires them to meet the needs of high voltage and large power. In conventional designs, in order to ensure that the battery pack does not exceed the maximum operating voltage of components such as motors and electronic controls in the industry, battery manufacturers usually use multiple battery packs with standard power levels in parallel, thereby increasing the power of the battery pack without increasing the total voltage of the battery system.

[0003] However, in this parallel battery system, if one of the parallel battery packs has an abnormality, the entire battery system will not work. Generally, the entire battery system is replaced through a battery replacement device or directly towed to a maintenance station for repair, which is extremely time-consuming and labor-intensive.

[0004] In addition, if the cells of a group of parallel battery packs have self-discharge or voltage difference problems, a circulation current caused by the voltage difference will be generated between other parallel battery packs, which will usually lower the voltage of the cells of other normal parallel battery packs. Some may even cause the entire battery system to be damaged and scrapped. When the circulation current is serious, the risk of fire is also greater. Utility Model Content

[0005] In view of this, in order to solve the above problems, the purpose of the present utility model is to provide a battery system high-voltage control box, comprising: a box body, an electrical component assembly, a battery interface assembly, an output interface assembly and a copper busbar assembly, wherein the electrical component assembly is fixedly disposed in the box body, the battery interface assembly and the output interface assembly are both embedded in the box body, and the electrical component assembly is electrically connected to the battery interface assembly and the output interface assembly respectively through the copper busbar assembly;

[0006] Wherein, the electrical device assembly at least includes: a plurality of branch circuit assemblies, wherein the plurality of branch circuit assemblies are connected in parallel between the battery interface assembly and the output interface assembly;

[0007] Each branch circuit assembly includes: a fuse, a branch circuit contactor and a current detector electrically connected in sequence, the fuse is electrically connected to the battery interface assembly, and the current detector is electrically connected to the main positive contactor.

[0008] In another preferred embodiment, the electrical component assembly further includes: a BMS main control module, wherein the BMS main control module is electrically connected to the current detector, and the BMS main control module is electrically connected to the branch contactor.

[0009] In another preferred embodiment, the electrical device assembly further includes: a main positive contactor and a main negative contactor, several branch assemblies are connected in parallel between the battery interface assembly and the main positive contactor, the main positive contactor is electrically connected to the output interface assembly, and the main negative contactor is electrically connected between the battery interface assembly and the output interface assembly.

[0010] In another preferred embodiment, the number of the branch circuit assemblies is three.

[0011] In another preferred embodiment, the battery interface assembly includes: three battery positive interfaces and three battery negative interfaces, each of the battery positive interfaces is electrically connected to one of the branch circuit assemblies, and each of the battery negative interfaces is electrically connected to the main negative contactor.

[0012] In another preferred embodiment, the output interface assembly includes: two fast charging interfaces and a motor drive interface, and the two fast charging interfaces and the motor drive interface are both electrically connected to the main positive contactor.

[0013] In another preferred embodiment, a motor fuse is electrically connected between the motor drive interface and the main positive contactor.

[0014] In another preferred embodiment, a fast charging positive contactor is electrically connected between the fast charging interface and the main positive contactor, and a fast charging negative contactor is electrically connected between the fast charging interface and the main negative contactor.

[0015] In another preferred embodiment, the electrical component assembly further includes: an auxiliary fuse assembly and an auxiliary interface assembly, the auxiliary interface assembly is embedded in the box body, and the auxiliary interface assembly, the auxiliary fuse assembly and the main positive contactor are electrically connected in sequence.

[0016] In another preferred embodiment, the box body includes: a lower shell, an upper cover and a sealing ring, the upper cover is installed on the lower shell through a plurality of bolts, the sealing ring is clamped between the upper cover and the lower shell, and the electrical component assembly is fixed in the lower shell.

[0017] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0018] Through the application of the utility model, a high-voltage control box suitable for a battery system with multiple battery packs connected in parallel is provided. By adding separate fuses, contactors and current sensors to the parallel battery pack branches, the circuit of the parallel battery packs can be opened and closed and the faulty battery packs can be disconnected, effectively avoiding the damage to the battery system caused by the circulating current. At the same time, the faulty battery pack can be removed at any time without affecting the vehicle's driving. Different functional interfaces can also be flexibly selected according to the actual use requirements of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall schematic diagram of a high-voltage control box for a battery system according to the present invention;

[0020] Figure 2 This is a schematic diagram of the installation of a high-voltage control box for a battery system according to the present invention;

[0021] Figure 3 This is a schematic diagram of the interior of a high-voltage control box for a battery system according to the present invention;

[0022] Figure 4 This is an exploded schematic diagram of a high-voltage control box for a battery system according to the present invention;

[0023] Figure 5 This is a schematic diagram of the principle of a high-voltage control box for a battery system according to the present utility model.

[0024] In the attached figure:

[0025] 1. Box body; 2. Electrical component assembly; 3. Battery interface assembly; 4. Output interface assembly; 5. Copper busbar assembly; 6. Branch assembly; 7. Fuse; 8. Branch contactor; 9. Current detector; 10. BMS main control module; 11. Communication interface; 12. Wiring harness assembly; 13. Main positive contactor; 14. Main negative contactor; 15. Battery positive interface; 16. Battery negative interface; 17. Fast charging interface; 18. Motor drive interface; 19. Motor fuse; 20. Fast charging positive contactor; 21. Fast charging negative contactor; 22. Auxiliary power supply fuse assembly; 23. Auxiliary interface assembly; 24. Pre-charging device assembly; 25. Lower housing; 26. Upper cover; 27. Sealing ring; 28. Mounting angle; 29. ​​Mounting hole; 30. Power steering pump power interface; 31. AC power interface; 32. DCDC power interface; 33. Compressor power interface; 34. Water cooler power interface. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inside", "outside", "front", "back", "horizontal", and "vertical" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figures 1 to 5 The figure shows a preferred embodiment of a battery system high-voltage control box, comprising: a box body 1, an electrical component assembly 2, a battery interface assembly 3, an output interface assembly 4, and a copper busbar assembly 5. The electrical component assembly 2 is fixedly disposed within the box body 1, and the battery interface assembly 3 and the output interface assembly 4 are both embedded in the box body 1. The electrical component assembly 2 is electrically connected to the battery interface assembly 3 and the output interface assembly 4, respectively, via the copper busbar assembly 5. Furthermore, the box body 1 is used to accommodate the corresponding electrical component assembly 2 and the copper busbar assembly 5, and the surface of the box body 1 serves as the installation base for the battery interface assembly 3 and the output interface assembly 4. The high-voltage portion of the electrical component assembly 2 is connected to a high-voltage busbar through the copper busbar assembly 5, so as to form a corresponding power supply path from the battery interface assembly 3 to the output interface assembly 4.

[0029] Furthermore, as a preferred embodiment, the electrical device assembly 2 includes at least: a plurality of branch circuit assemblies 6, wherein the plurality of branch circuit assemblies 6 are connected in parallel between the battery interface assembly 3 and the output interface assembly 4. Furthermore, the plurality of branch circuit assemblies 6 are arranged so as to correspond to the plurality of battery packs connected in parallel to the battery system.

[0030] Furthermore, as a preferred embodiment, each branch assembly 6 includes: a fuse 7, a branch contactor 8, and a current detector 9 electrically connected in sequence, wherein the fuse 7 is electrically connected to the battery interface assembly 3, and the current detector 9 is electrically connected to the main positive contactor 13. Furthermore, by providing each branch assembly 6 corresponding to each battery pack, an independent on / off function is provided at that branch, so that the on / off of the branch can be controlled and the on / off status can be fed back through the branch contactor 8, the current of the branch can be detected through the current detector 9, especially overcurrent detection and power calculation, and short-circuit protection can be provided through the fuse 7; each branch assembly 6 is independent of each other and does not affect each other, so that under the control of other control modules, the circuit on / off of one or several branches can be individually controlled, and the corresponding battery pack can be selectively disconnected.

[0031] Furthermore, as a preferred embodiment, if any one or two battery packs fail, the corresponding battery pack branch can be cut off with a small current load after the entire vehicle is reduced in power, thereby eliminating the faulty battery pack and ensuring that other normal battery packs continue to work.

[0032] Furthermore, as a preferred embodiment, when the corresponding battery system is not working, all branch contactors 8 are disconnected and uploaded to the control module through feedback signals. Since the branches are independent of each other, no circulating current will be generated even if there is a large pressure difference between the battery packs. When the battery pack is powered on or starts charging, the pressure difference between the branches will be judged. The battery packs with large pressure differences will be directly excluded and not allowed to be merged into the main circuit. During charging, separate detection and judgment will be performed, and separate charging and balancing will be allowed to reach a normal state, and automatically merged into the main circuit without manual intervention.

[0033] Furthermore, as a preferred embodiment, the branch contactor 8 is preferably a contactor with a feedback function, which can at least provide real-time feedback on the on / off state of the branch; the current detector 9 is preferably a current sensor.

[0034] Furthermore, as a preferred embodiment, the electrical component assembly 2 further includes: a BMS main control module 10, wherein the BMS main control module 10 is electrically connected to the current detector 9, and the BMS main control module 10 is electrically connected to the branch contactor 8. Furthermore, the aforementioned control module is preferably the BMS main control module 10.

[0035] Furthermore, as a preferred embodiment, it further includes: a communication interface 11 , the BMS main control module 10 is electrically connected to the communication interface 11 , and the communication interface 11 is embedded in the box body 1 .

[0036] Furthermore, as a preferred embodiment, it further includes: a wiring harness assembly 12 , through which the BMS main control module 10 , the current detector 9 and the contactor are electrically connected.

[0037] Furthermore, as a preferred embodiment, the electrical device assembly 2 also includes: a main positive contactor 13 and a main negative contactor 14, several branch assemblies 6 are connected in parallel between the battery interface assembly 3 and the main positive contactor 13, the main positive contactor 13 is electrically connected to the output interface assembly 4, and the main negative contactor 14 is electrically connected between the battery interface assembly 3 and the output interface assembly 4.

[0038] Furthermore, as a preferred embodiment, the number of branch circuit assemblies 6 is three. Furthermore, each branch circuit assembly 6 is correspondingly provided with a battery positive interface 15 and a battery negative interface 16. The number of branch circuit assemblies 6 and corresponding interfaces can be increased or decreased according to the actual requirements of the battery system.

[0039] Furthermore, as a preferred embodiment, the battery interface assembly 3 includes: three battery positive interfaces 15 and three battery negative interfaces 16, each of the battery positive interfaces 15 is electrically connected to one of the branch circuit assemblies 6, and each of the battery negative interfaces 16 is electrically connected to the main negative contactor 14.

[0040] Furthermore, as a preferred embodiment, the output interface assembly 4 includes: two fast charging interfaces 17 and a motor drive interface 18 , and the two fast charging interfaces 17 and the motor drive interface 18 are both electrically connected to the main positive contactor 13 .

[0041] Furthermore, as a preferred embodiment, the high-voltage part of the electrical component assembly 2 is connected to the battery positive interface 15, the battery negative interface 16, the fast charging interface 17 and the motor drive interface 18 through the above-mentioned copper bus assembly 5 for high-voltage bus connection.

[0042] Furthermore, as a preferred embodiment, a motor fuse 19 is electrically connected between the motor drive interface 18 and the main positive contactor 13 .

[0043] Furthermore, as a preferred embodiment, a fast charging positive contactor 20 is electrically connected between the fast charging interface 17 and the main positive contactor 13 , and a fast charging negative contactor 21 is electrically connected between the fast charging interface 17 and the main negative contactor 14 .

[0044] Furthermore, as a preferred embodiment, the electrical component assembly 2 also includes: an auxiliary fuse assembly 22 and an auxiliary interface assembly 23, the auxiliary interface assembly 23 is embedded in the box body 1, and the auxiliary interface assembly 23, the auxiliary fuse assembly 22 and the main positive contactor 13 are electrically connected in sequence.

[0045] Furthermore, as a preferred embodiment, the auxiliary interface assembly 23 includes any one or more of: a power steering pump power interface 30, an AC power interface 31, a DC / DC power interface 32, a compressor power interface 33, and a water-cooler power interface 34. Furthermore, the power steering pump power interface 30, the AC power interface 31, the DC / DC power interface 32, the compressor power interface 33, and the water-cooler power interface 34 can be configured according to the actual needs of the vehicle. This configuration can include adding or removing corresponding interfaces, as well as increasing or decreasing their number.

[0046] Furthermore, as a preferred embodiment, the electrical device assembly 2 further includes: a pre-charging device assembly 24 , which is connected between the main positive contactor 13 and the main negative contactor 14 through the wiring harness assembly 12 .

[0047] The above description is only a preferred embodiment of the present invention and does not limit the implementation manner and protection scope of the present invention.

[0048] The present invention also has the following implementation methods based on the above:

[0049] In a further embodiment of the present invention, the box body 1 includes: a lower shell 25, an upper cover 26, and a sealing ring 27. The upper cover 26 is mounted on the lower shell 25 via a plurality of bolts. The sealing ring 27 is clamped between the upper cover 26 and the lower shell 25. The electrical component assembly 2 is fixed within the lower shell 25. Furthermore, the bolts penetrate the sealing ring 27 to seal the upper cover 26 and the lower shell 25. Preferably, the sealing of the box body 1 reaches IP67 level.

[0050] In a further embodiment of the present invention, a staggered horizontal and vertical beam reinforcement structure is provided on the inner wall of the lower shell 25 .

[0051] In a further embodiment of the present invention, the sealing ring 27 is pre-adhered to the upper edge of the lower housing 25 by means of colloid.

[0052] In a further embodiment of the present invention, the electrical component assembly 2 is fixedly mounted on the bottom of the lower housing 25 by fasteners.

[0053] A further embodiment of the present invention further includes: a plurality of mounting angles 28, each of which is mounted on the lower end of the outer wall of the lower housing 25, and each of which has at least one mounting hole 29. Furthermore, the provision of the mounting angles 28 facilitates mounting the battery system high-voltage control box at a designated location on the vehicle body by coupling it with additional fasteners.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery system high voltage control box, characterized in that: include: A box body, an electrical component assembly, a battery interface assembly, an output interface assembly, and a copper busbar assembly. The electrical component assembly is fixedly disposed in the box body, the battery interface assembly and the output interface assembly are both embedded in the box body, and the electrical component assembly is electrically connected to the battery interface assembly and the output interface assembly respectively through the copper busbar assembly. Wherein, the electrical device assembly at least includes: a plurality of branch circuit assemblies, wherein the plurality of branch circuit assemblies are connected in parallel between the battery interface assembly and the output interface assembly; Each branch circuit assembly includes: a fuse, a branch circuit contactor and a current detector electrically connected in sequence, the fuse is electrically connected to the battery interface assembly, and the current detector is electrically connected to the main positive contactor.

2. The battery system high voltage control box according to claim 1, characterized in that: The electrical component assembly further includes a BMS main control module, wherein the BMS main control module is electrically connected to the current detector and the BMS main control module is electrically connected to the branch contactor.

3. The battery system high voltage control box according to claim 2, characterized in that: The electrical device assembly also includes: a main positive contactor and a main negative contactor, several branch assemblies are connected in parallel between the battery interface assembly and the main positive contactor, the main positive contactor is electrically connected to the output interface assembly, and the main negative contactor is electrically connected between the battery interface assembly and the output interface assembly.

4. The battery system high voltage control box according to claim 3, characterized in that: The number of the branch assemblies is three.

5. The battery system high voltage control box according to claim 4, characterized in that: The battery interface assembly includes: three battery positive interfaces and three battery negative interfaces, each of the battery positive interfaces is electrically connected to a branch circuit assembly, and each of the battery negative interfaces is electrically connected to the main negative contactor.

6. The battery system high voltage control box according to claim 4, characterized in that: The output interface assembly includes: two fast charging interfaces and a motor drive interface, and the two fast charging interfaces and the motor drive interface are both electrically connected to the main positive contactor.

7. The battery system high voltage control box according to claim 6, characterized in that: A motor fuse is electrically connected between the motor drive interface and the main positive contactor.

8. The battery system high voltage control box according to claim 6, characterized in that: A fast charging positive contactor is electrically connected between the fast charging interface and the main positive contactor, and a fast charging negative contactor is electrically connected between the fast charging interface and the main negative contactor.

9. The battery system high voltage control box according to claim 3, characterized in that: The electrical component assembly further includes: an auxiliary fuse assembly and an auxiliary interface assembly. The auxiliary interface assembly is embedded in the box body. The auxiliary interface assembly, the auxiliary fuse assembly and the main positive contactor are electrically connected in sequence.

10. The battery system high voltage control box according to claim 1, characterized in that: The box body includes: a lower shell, an upper cover and a sealing ring. The upper cover is installed on the lower shell through a plurality of bolts. The sealing ring is clamped between the upper cover and the lower shell. The electrical component assembly is fixed in the lower shell.

Images