Low-cost battery system high-voltage box

Abstract

The utility model discloses a low-cost high-voltage box of a battery system. The low-cost high-voltage box comprises a high-voltage box shell, a BMS (Battery Management System) host and related electrical components, a contactor K1, a contactor K2, a contactor K3, a contactor K4, a fuse F1 and a current sensor are arranged in the high-voltage box. The discharging loop uses a discharging negative relay, so that a pre-charging function is cancelled, and the use of a pre-charging relay and a pre-charging resistor is reduced; a discharge relay is placed in a total negative loop, and a relay is omitted for a liquid cooling loop; one BMS is used, insulation detection is integrated in a BMS host, and an insulation detector does not need to be purchased independently; positive and negative connectors of the battery and positive and negative charging and discharging are replaced by via hole sheaths; debugging ports are removed and are integrated into an intranet communication port, so that the use of debugging plug-ins is reduced; besides, a heating loop is changed into liquid cooling / liquid heating, the cost of a heating film and related heating wire harnesses is reduced, and a liquid cooling liquid heating unit is purchased in a centralized manner by a whole vehicle factory, so that the cost of a battery system is further reduced, and the cost pressure of the battery factory is relieved.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicle battery management systems, in particular to a low-cost battery system high-voltage box. Background Art

[0002] Recently, new energy vehicles have developed rapidly and new energy vehicle batteries have been widely used. With the cancellation of new energy subsidies, battery factories are facing increasingly severe cost pressures.

[0003] How to survive in the future competition has become an urgent problem facing all battery manufacturers. To this end, optimizing the design of the high-voltage box and reducing the cost of the high-voltage box has become the first choice under the premise of meeting basic functions and not compromising the safety of the entire vehicle. Utility Model Content

[0004] The utility model provides a low-cost battery system high-voltage box, optimizes the design of the high-voltage box of the battery system of a new energy vehicle, and reduces the cost of the high-voltage box.

[0005] The utility model adopts the following technical scheme: a low-cost battery system high-voltage box, including: a high-voltage box shell, a BMS host, the high-voltage box shell has a built-in battery system, the battery system is connected to the discharge interface, charging interface, and liquid cooling interface on the outer wall of the high-voltage box shell through the first contactor K1, the second contactor K2, the third contactor K3, the fourth contactor K4, the fuse F1 and the Hall sensor; the BMS host connects the battery system and the vehicle communication interface and the intranet communication interface on the outer wall of the high-voltage box shell, controls the charging and discharging of the battery system and external communication, and integrates the insulation detection of the battery system.

[0006] Furthermore, the discharge interface includes a discharge positive electrode and a discharge negative electrode; the charging interface includes a charging positive interface and a charging negative interface; and the liquid cooling interface includes a liquid cooling positive interface and a liquid cooling negative interface.

[0007] Furthermore, the normally open switch second contact 12 of the first contactor K1 and the normally open switch first contact 41 of the fourth contactor K4 are connected in parallel and connected to the positive pole of the battery system through the MSD module; the normally open switch first contact 11 of the first contactor K1 is connected to the positive charging interface.

[0008] Furthermore, the normally open switch second contact 42 of the fourth contactor K4 is connected to the liquid cooling positive interface through the liquid cooling circuit fuse F1.

[0009] Furthermore, the first contact 21 of the normally open switch of the second contactor K2 is connected to the negative interface of liquid cooling; the second contact 22 of the normally open switch of the second contactor K2 is connected to the negative interface of charging.

[0010] Furthermore, the third contactor K3 is placed in the main negative circuit of the battery system, and the normally open switch second contact 32 of the third contactor K3 is connected to the negative electrode of the battery system through the Hall sensor via a series connection.

[0011] The normally open switch first contact 31 of the third contactor K3 is connected to the discharge negative electrode and the liquid cooling negative interface, and is connected to the charging negative interface through the normally open switch first contact 21 of the second contactor K2.

[0012] Furthermore, the connectors of the positive and negative electrodes of the battery system and the discharge interface and the charging interface are via sheaths.

[0013] Furthermore, the debugging port is concentrated on the intranet communication interface.

[0014] Furthermore, based on the liquid cooling interface, liquid cooling / liquid heating of the battery system is achieved through a liquid cooling / liquid heating unit.

[0015] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0016] 1. The battery system high-voltage box provided by the utility model cancels the pre-charging function, uses a discharge negative relay through the discharge circuit, places the pre-charging function in the vehicle all-in-one, cancels the pre-charging function, and reduces the use of relays and pre-charging resistors.

[0017] 2. The battery system high-voltage box provided by the utility model uses a BMS host integrated with an insulation detection function, thereby saving the purchase cost of an insulation detector.

[0018] 3. In the battery system high-voltage box provided by the utility model, the discharge negative relay is placed in the main negative circuit of the battery system, which saves a relay for the liquid cooling circuit and reduces the cost.

[0019] 4. The battery system high-voltage box provided by the utility model uses the liquid cooling and liquid heating functions of the liquid cooling unit, avoiding the use of heating films and heating harnesses from the perspective of system cost, thereby further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit schematic diagram of a high-voltage box of a battery system provided by the utility model. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0022] In one embodiment of the present invention, a low-cost battery system high-voltage box, such as Figure 1 As shown, the high-voltage box has four built-in contactors (relays), including: a first contactor K1, a second contactor K2, a third contactor K3, and a fourth contactor K4, as well as a fuse F1 and a Hall sensor; a discharge interface, a fast charging interface, a liquid cooling interface, a vehicle communication interface, and an intranet communication interface are provided on the outer wall of the high-voltage box.

[0023] Specifically, the contact 12 of the normally open switch of the first contactor K1 and the contact 41 of the normally open switch of the fourth contactor K4 are connected in parallel and connected to the positive pole of the battery system through the MSD module, and the MSD module is used for interlock detection; the contact 11 of the normally open switch of the first contactor K1 is connected to the positive charging interface.

[0024] The contact 42 of the normally open switch of the fourth contactor K4 is connected to the liquid cooling positive interface through the liquid cooling circuit fuse F1.

[0025] The contact 21 of the normally open switch of the second contactor K2 is connected to the contact 31 of the normally open switch of the third contactor K3, and the contact 21 of the normally open switch of the second contactor K2 is also connected to the liquid cooling negative interface; the contact 22 of the normally open switch of the second contactor K2 is connected to the charging negative interface.

[0026] The contact 32 of the normally open switch of the third contactor K3 is connected to the negative electrode of the battery system through the Hall sensor in series, and the contact 31 of the normally open switch of the third contactor K3 is connected to the discharge negative electrode.

[0027] Before applying high voltage, the voltage at the rear end of the four contactors needs to be compared with the reference voltage.

[0028] In this embodiment, the reference voltage is: BAT2- / BAT2+, the rear end voltage of the first contactor K1 is: BAT2- / BAT3+, the rear end voltage of the fourth contactor K4 is: BAT2- / BAT5+, the rear end voltage of the second contactor K2 is: BAT1- / BAT1+, and the rear end voltage of the third contactor K3 is: BAT4- / BAT1+.

[0029] When measuring the voltage at the rear end of the second contactor K2, the third contactor K3 needs to be closed in advance.

[0030] When the ambient temperature reaches the preset threshold, the liquid cooling relay K4 is closed, and the liquid cooling / liquid heating function is turned on according to the actual temperature.

[0031] In summary, in this embodiment, by using a discharge negative relay, i.e., the third contactor K3, in the discharge circuit of the battery system, the pre-charging function is cancelled, the use of pre-charging relays and pre-charging resistors is reduced, and at the same time, the discharge relay is placed in the total negative circuit, saving a relay for the liquid cooling circuit, further reducing costs.

[0032] In the present embodiment, the low-cost battery system high-voltage box also uses a BMS, and the insulation detection function is integrated into the BMS host, thereby further reducing the cost of purchasing an insulation detector separately.

[0033] At the same time, the positive and negative connectors of the battery and the positive and negative connectors of charging and discharging are replaced with through-hole covers, the debugging port is removed, and the debugging port function is concentrated on the intranet communication port to reduce the use of debugging plug-ins.

[0034] In addition, the conventional heating circuit was removed and replaced with a liquid cooling / liquid heating solution, which reduced the use of heating films and related heating harnesses. Liquid cooling and liquid heating units were purchased centrally by vehicle manufacturers, further reducing the cost of the battery system and alleviating cost pressure on battery manufacturers.

[0035] The above embodiments are merely illustrative of the technical solutions of the utility model, and are not intended to limit the scope of the utility model. Without departing from the design spirit of the utility model, various modifications and improvements made to the technical solutions of the utility model by ordinary technicians in this field should fall within the protection scope determined by the claims of the utility model.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A low-cost battery system high-voltage box, characterized in that: include: A high-voltage box shell and a BMS host. The high-voltage box shell has a built-in battery system. The battery system is connected to the discharge interface, charging interface, and liquid cooling interface on the outer wall of the high-voltage box shell through a first contactor (K1), a second contactor (K2), a third contactor (K3), a fourth contactor (K4), a fuse (F1), and a Hall sensor. The BMS host is connected to the battery system and the vehicle communication interface and the intranet communication interface on the outer wall of the high-voltage box shell, controls the charging and discharging of the battery system and external communication, and integrates insulation detection of the battery system.

2. The low-cost battery system high-voltage box according to claim 1, characterized in that: The discharge interface includes a discharge positive electrode and a discharge negative electrode; the charging interface includes a charging positive interface and a charging negative interface; the liquid cooling interface includes a liquid cooling positive interface and a liquid cooling negative interface.

3. The low-cost battery system high-voltage box according to claim 2, characterized in that: The normally open switch second contact (12) of the first contactor (K1) and the normally open switch first contact (41) of the fourth contactor (K4) are connected in parallel and then connected to the positive electrode of the battery system through the MSD module; the normally open switch first contact (11) of the first contactor (K1) is connected to the positive charging interface.

4. The low-cost battery system high-voltage box according to claim 3, characterized in that: The normally open switch second contact (42) of the fourth contactor (K4) is connected to the liquid cooling positive interface through the liquid cooling circuit and the fuse (F1).

5. The low-cost battery system high-voltage box according to claim 2, characterized in that: The normally open switch first contact (21) of the second contactor (K2) is connected to the liquid cooling negative interface; the normally open switch second contact (22) of the second contactor (K2) is connected to the charging negative interface.

6. The low-cost battery system high-voltage box according to claim 2, characterized in that: The third contactor (K3) is placed in the main negative circuit of the battery system, and the normally open switch second contact (32) of the third contactor (K3) is connected to the negative electrode of the battery system through the Hall sensor in series.

7. The low-cost battery system high-voltage box according to claim 6, characterized in that: The first contact point (31) of the normally open switch of the third contactor (K3) is connected to the discharge negative electrode and the liquid cooling negative interface, and is connected to the charging negative interface through the first contact point (21) of the normally open switch of the second contactor (K2).

8. The low-cost battery system high-voltage box according to claim 1, characterized in that: The connectors for the positive and negative poles of the battery system and the discharge and charging interfaces are through-hole sheaths.

9. The low-cost battery system high-voltage box according to claim 1, characterized in that: The debugging ports are concentrated on the intranet communication interface.

10. The low-cost battery system high-voltage box according to claim 1, characterized in that: Based on the liquid cooling interface, liquid cooling / liquid heating of the battery system is achieved through a liquid cooling / liquid heating unit.

Images