High-voltage box installed on heavy truck

Abstract

The utility model belongs to the technical field of charging and discharging high-voltage boxes, and particularly relates to a high-voltage box installed on a heavy truck. Comprising a box body and a BMS host, and the outer wall of the box body is provided with a grounding and intranet communication interface and a whole vehicle communication interface; a host, a contactor K1, a contactor K2, a contactor K4, a contactor K6, a contactor K7 and a contactor K8 are arranged in the box body; a second contact of the contactor K1, a second contact of the contactor K2 and a second contact of the contactor K4 are connected in parallel and then are connected with a first discharge positive interface and a second discharge positive interface; a first contact of the contactor K6, a first contact of the contactor K7 and a second contact of the contactor K8 are connected in parallel and then are connected with a first battery negative interface and a second battery negative interface. 12V / 24V double-circuit fast charging can be realized by closing the contactors K1, K2, K4, K6 and K7, double-circuit discharging output can be realized by closing the contactors K4 and K8, charging is safe and reliable, and charging efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of charging and discharging high-voltage boxes, in particular to a high-voltage box installed on a heavy truck. Background Art

[0002] The existing high-voltage boxes on heavy trucks have few charging and discharging branches and no pre-charge on the negative pole, which cannot meet the charging and discharging needs of heavy trucks. In addition, the charging speed is slow and the charging safety is poor, which easily causes safety problems. In addition, installation and maintenance are very troublesome, which seriously affects its use effect.

[0003] Therefore, a high-voltage box installed on a heavy truck is needed to solve the above problems. Utility Model Content

[0004] In response to the above problems, the present invention proposes a high-voltage box installed on a heavy truck, comprising a box body and a BMS host. The outer wall of the box body is provided with a grounding, an intranet communication interface, and a vehicle communication interface; the box body is provided with a host, contactors K1, K2, K4, K6, K7, and K8; the second contact of the contactor K1, the second contact of the contactor K2, and the second contact of the contactor K4 are connected in parallel and connected to the first discharge positive interface and the second discharge positive interface;

[0005] The first contact of the contactor K6, the first contact of the contactor K7 and the second contact of the contactor K8 are connected in parallel and connected to the negative interface of the first battery and the negative interface of the second battery;

[0006] The contact No. 1 of the contactor K1 is connected to the No. 1 charging positive interface;

[0007] The first contact of the contactor K2 is connected to the second charging positive port;

[0008] The first contact of the contactor K4 is connected to the positive port of the first battery through MSD1;

[0009] Connect to the positive port of the No. 2 battery through MSD2;

[0010] The second contact of the contactor K6 is connected to the negative charging port No. 1;

[0011] The second contact of the contactor K7 is connected to the second negative charging interface;

[0012] The first contact of the contactor K8 is connected to the first discharge negative interface and the second discharge negative interface.

[0013] Furthermore, the first contact of the contactor K8 is connected in parallel with the first contact of the contactor K9; the second contact of the contactor K9 is connected to the negative interface of the first battery and the negative interface of the second battery through a pre-charging resistor.

[0014] Furthermore, the second contact of the contactor K5 is connected to the first heating outlet interface and the second heating outlet interface; the first contact of the contactor K6 is connected to the first heating inlet interface and the second heating inlet interface.

[0015] Furthermore, the second contact of the contactor K3 is connected to the liquid cooling positive interface, and the first contact of the contactor K6 is connected to the liquid cooling negative interface.

[0016] Furthermore, the second contact of the contactor K5 is connected to the first heating outlet interface and the second heating outlet interface through the loop fuse F1.

[0017] Furthermore, the second contact of the contactor K3 is connected to the liquid cooling positive interface through the loop fuse F2.

[0018] Furthermore, a No. 1 current sensor is provided between the negative interface of the No. 1 battery and contactors K6, K7 and K8; and the contactor K4 is connected in parallel with the No. 2 current sensor.

[0019] Furthermore, contact No. 1 of the contactor K4 is connected to the branch fuse F3.

[0020] Furthermore, the second current sensor is connected to the branch fuse F4.

[0021] Furthermore, an insulation tester is provided inside the box.

[0022] The utility model can realize 12V / 24V dual-channel fast charging by closing contactors K1, K2, K4, K6, and K7, realize dual-channel discharge output by closing contactors K4 and K8, and realize negative electrode pre-charging function by closing pre-charging resistors, contactors K8 and K9. Charging is safe and reliable with high charging efficiency, low cost, and very convenient and reliable installation and maintenance.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 Shown is an electrical schematic diagram of the present utility model.

[0026] In the figure, 1. No. 1 discharge positive interface; 2. No. 2 discharge positive interface; 3. No. 1 charging positive interface; 4. No. 2 charging positive interface; 5. Liquid cooling positive interface; 6. Liquid cooling negative interface; 7. No. 1 charging negative interface; 8. No. 2 charging negative interface; 9. No. 1 discharge negative interface; 10. No. 2 discharge negative interface; 11. No. 1 battery positive interface; 12. MSD1; 13. MSD2; 14. No. 2 battery positive interface; 15. No. 1 heating output interface; 16. No. 1 heating input interface; 17. No. 2 heating output interface; 18. No. 2 heating input interface; 19. No. 2 battery negative interface; 20. No. 1 battery negative interface; 21. BMS host; 22. No. 1 current sensor; 23. No. 2 current sensor; 24. Pre-charge resistor; 25. Intranet communication interface; 26. Vehicle communication interface; 27. Insulation tester. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The embodiment of the utility model provides a high-voltage box installed on a heavy truck to solve the problem that the high-voltage box on a heavy truck in the prior art has few charging and discharging branches and cannot meet the charging and discharging needs of the heavy truck. Figure 1 , including a box body and a BMS host 21, the outer wall of the box body is provided with a grounding, an intranet communication interface 25 and a vehicle communication interface 26; the box body is provided with a host, a contactor K1, a contactor K2, a contactor K4, a contactor K6, a contactor K7 and a contactor K8; the second contact of the contactor K1, the second contact of the contactor K2 and the second contact of the contactor K4 are connected in parallel and connected to the first discharge positive interface 1 and the second discharge positive interface 2;

[0029] The first contact of the contactor K6, the first contact of the contactor K7 and the second contact of the contactor K8 are connected in parallel and connected to the negative interface 20 of the first battery and the negative interface 19 of the second battery;

[0030] The contact No. 1 of the contactor K1 is connected to the No. 1 charging positive interface 3;

[0031] The first contact of the contactor K2 is connected to the second charging positive interface 4;

[0032] The contact No. 1 of the contactor K4 is connected to the positive port 11 of the No. 1 battery through MSD112;

[0033] Connect to the positive port 14 of the No. 2 battery via MSD213;

[0034] The second contact of the contactor K6 is connected to the first negative charging interface 7;

[0035] The second contact of the contactor K7 is connected to the second negative charging interface 8;

[0036] The first contact of the contactor K8 is connected to the first discharge negative interface 9 and the second discharge negative interface 10 .

[0037] The BMS host 21 controls the closing of contactors K1, K2, K4, K6 and K7 to achieve dual-path fast charging; closing contactors K4 and K8 achieves dual-path discharge output to meet the charging needs of heavy trucks.

[0038] At the same time, the connectors outside the box (such as MSD112, MSD213 and No. 1 battery, etc.) use a junction box, which is low in cost; the installation and maintenance of the wiring harness outside the box is also very convenient and reliable.

[0039] In one embodiment, the first contact of the contactor K8 is connected in parallel with the first contact of the contactor K9; the second contact of the contactor K9 is connected to the negative interface 20 of the first battery and the negative interface 19 of the second battery through the pre-charging resistor 24.

[0040] By closing the pre-charging resistor 24, the contactor K8 and the contactor K9, the pre-charging function is realized, so that charging is safe, reliable and efficient.

[0041] The second contact of the contactor K5 is connected to the first heating outlet interface 15 and the second heating outlet interface 17; the first contact of the contactor K6 is connected to the first heating inlet interface 16 and the second heating inlet interface 18.

[0042] In a low temperature environment, when the ambient temperature reaches a certain requirement, the contactor K5 is closed, and the heating function is turned on according to the specific temperature strategy, so that the high-voltage box can also work in a low temperature environment, expanding the range of use environment.

[0043] The second contact of the contactor K3 is connected to the liquid cooling positive interface 5 , and the first contact of the contactor K6 is connected to the liquid cooling negative interface 6 .

[0044] In a high temperature environment, when the ambient temperature reaches a certain requirement, the contactor K3 is closed, and the liquid cooling function is turned on according to the specific temperature strategy, so that the high-voltage box can also work in a high temperature environment, further expanding the range of the use environment.

[0045] Contactor K5's second contact is connected to heating outlet port 15 and heating outlet port 17 via circuit fuse F1. Contactor K3's second contact is connected to liquid cooling positive port 5 via circuit fuse F2. By providing circuit fuses F1 and F2, if the current on the high-voltage box's inner wall abnormally rises to a certain level and reaches a certain temperature, the current is cut off, protecting the safe operation of the circuit.

[0046] A No. 1 current sensor 22 is provided between the No. 1 battery negative interface 20 and contactors K6, K7 and K8; the contactor K4 is connected in parallel with the No. 2 current sensor 23; the No. 1 current sensor 22 and the No. 2 current sensor 23 collect and measure the current to further ensure the safety of the charging and discharging process in the box.

[0047] The first contact of the contactor K4 is connected to the branch fuse F3; the second current sensor 23 is connected to the branch fuse F4. By setting the branch fuse F3 and the branch fuse F4, when the current exceeds the specified value, the circuit is disconnected to protect the safe operation of the circuit.

[0048] An insulation tester 27 is provided inside the box; for the nine contactors in this application, before applying high voltage, the voltages at the rear ends of the nine contactors need to be compared with the reference voltage to perform contactor adhesion fault detection, so as to determine whether there is a problem: insulation tester 27 reference voltage: V1- / V1+; rear end voltage of contactor K1 V2- / V5+; rear end voltage of contactor K2 V2- / V6+; rear end voltage of contactor K3 V2- / V7+; rear end voltage of contactor K5 V1- / V3+; rear end voltage of contactor K6 V3- / V8+; rear end voltage of contactor K7 V4- / V9+; rear end voltage of contactor K8 and contactor K9 V5- / V10+; further ensuring safety during high-voltage charging and discharging.

[0049] The utility model can realize 12V / 24V dual-channel fast charging by closing contactors K1, K2, K4, K6, and K7, realize dual-channel discharge output by closing contactors K4 and K8, and realize negative electrode pre-charging function by closing pre-charging resistor 24, contactors K8, and K9. Charging is safe and reliable with high charging efficiency, low cost, and very convenient and reliable installation and maintenance. The utility model supports full functions and can be subtracted on this basis to adapt to more projects.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-voltage box installed on a heavy truck, characterized in that: It comprises a box body and a BMS host (21), wherein the outer wall of the box body is provided with a grounding, an intranet communication interface (25) and a vehicle communication interface (26); the box body is provided with a host, a contactor K1, a contactor K2, a contactor K4, a contactor K6, a contactor K7 and a contactor K8; the second contact of the contactor K1, the second contact of the contactor K2 and the second contact of the contactor K4 are connected in parallel and connected to the first discharge positive interface (1) and the second discharge positive interface (2); The first contact of the contactor K6, the first contact of the contactor K7 and the second contact of the contactor K8 are connected in parallel and connected to the negative interface (20) of the first battery and the negative interface (19) of the second battery; The first contact of the contactor K1 is connected to the first positive charging interface (3); The first contact of the contactor K2 is connected to the second positive charging interface (4); The first contact of the contactor K4 is connected to the positive port (11) of the first battery via MSD1 (12); Connect to the positive port (14) of the second battery via MSD2 (13); The second contact of the contactor K6 is connected to the first negative charging interface (7); The second contact of the contactor K7 is connected to the second negative charging interface (8); The first contact of the contactor K8 is connected to the first discharge negative interface (9) and the second discharge negative interface (10).

2. The high-voltage box installed on a heavy truck according to claim 1, characterized in that: The first contact of the contactor K8 is connected in parallel with the first contact of the contactor K9; the second contact of the contactor K9 is connected to the negative interface (20) of the first battery and the negative interface (19) of the second battery through a pre-charging resistor (24).

3. The high-voltage box installed on a heavy truck according to claim 2, characterized in that: The second contact of the contactor K5 is connected to the first heating outlet interface (15) and the second heating outlet interface (17); the first contact of the contactor K6 is connected to the first heating inlet interface (16) and the second heating inlet interface (18).

4. The high-voltage box installed on a heavy truck according to claim 3, characterized in that: The second contact of the contactor K3 is connected to the liquid cooling positive interface (5), and the first contact of the contactor K6 is connected to the liquid cooling negative interface (6).

5. The high-voltage box installed on a heavy truck according to claim 4, characterized in that: The second contact of the contactor K5 is connected to the first heating outlet interface (15) and the second heating outlet interface (17) via a loop fuse F1.

6. The high-voltage box installed on a heavy truck according to claim 5, characterized in that: The second contact of the contactor K3 is connected to the liquid cooling positive interface (5) through the loop fuse F2.

7. The high-voltage box installed on a heavy truck according to claim 6, characterized in that: A No. 1 current sensor (22) is provided between the No. 1 battery negative interface (20) and the contactors K6, K7, and K8; and the contactor K4 is connected in parallel with the No. 2 current sensor (23).

8. The high-voltage box installed on a heavy truck according to claim 6, characterized in that: Contact No. 1 of the contactor K4 is connected to the branch fuse F3.

9. The high-voltage box installed on a heavy truck according to claim 7, characterized in that: The second current sensor (23) is connected to the branch fuse F4.

10. The high-voltage box installed on a heavy truck according to claim 9, characterized in that: An insulation detector (27) is provided inside the box.

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