High-voltage box of four-gun fast-charging battery system

Abstract

The utility model discloses a high-voltage box of a four-gun fast charging battery system, which comprises a charging circuit, a discharging circuit and a liquid cooling circuit, and the charging circuit, the discharging circuit and the liquid cooling circuit are respectively connected with a battery. The charging circuit is further connected with a first charging positive electrode interface, a first charging negative electrode interface, a second charging positive electrode interface, a second charging negative electrode interface, a third charging positive electrode interface, a third charging negative electrode interface, a fourth charging positive electrode interface and a fourth charging negative electrode interface. And the liquid cooling circuit is also respectively connected with the liquid cooling positive electrode interface and the liquid cooling negative electrode interface. According to the high-voltage box, the number of the charging ports is increased to four, the charging current is increased, the charging time is shortened, in addition, a liquid cooling circuit is adopted, a traditional heating loop is omitted, and therefore the cost of a heating film and related heating wire harnesses is reduced by adopting a liquid cooling / liquid heating scheme, the cost of the high-voltage box is reduced, and the reliability and safety of the high-voltage box are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy automobile battery management technical field, especially relate to a four gun fast charging battery system high pressure box. BACKGROUND

[0002] With new energy heavy truck popularization, the operation unit faces more and more serious time cost pressure.How to survive in the future competition, become the urgent problem that each manufacturer faces.Therefore, under the premise of meeting the basic function and not damaging the safety of the whole vehicle, optimize the high pressure box design, increase the number of charging ports, improve the charging current, reduce the battery system charging time, improve the operation mileage become the first choice.Therefore, how to design a kind of efficient high pressure box becomes the technical problem to be solved urgently. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problem, the utility model aims at providing a four gun fast charging battery system high pressure box, including charging circuit, discharging circuit and liquid cooling circuit, charging circuit, discharging circuit and liquid cooling circuit are connected with battery respectively;Among them,

[0004] The charging circuit is also connected with first charging positive pole interface, first charging negative pole interface, second charging positive pole interface, second charging negative pole interface, third charging positive pole interface, third charging negative pole interface, fourth charging positive pole interface and fourth charging negative pole interface respectively;

[0005] The liquid cooling circuit is also connected with liquid cooling positive pole interface and liquid cooling negative pole interface.

[0006] Further, it further includes contactor K13, contactor K14, first current sensor, second current sensor, third current sensor, contactor K13 is connected in parallel with contactor K14, first current sensor, second current sensor, third current sensor are connected in parallel two by two;

[0007] The charging circuit, discharging circuit and liquid cooling circuit are connected to the positive pole of the battery after being connected with contactor K13 and contactor K14 respectively;

[0008] The charging circuit, discharging circuit and liquid cooling circuit are also connected to the negative pole of the battery after being connected with first current sensor, second current sensor and third current sensor respectively.

[0009] Further, the charging circuit includes contactor K3, contactor K4, contactor K5, contactor K6, contactor K8, contactor K9, contactor K10 and contactor K11, wherein,

[0010] The positive pole contact of the contactor K3 is connected with the first charging positive pole interface;

[0011] The positive contact of the contactor K4 is connected with the first charging positive interface;

[0012] The positive contact of the contactor K5 is connected with the first charging positive interface;

[0013] The positive contact of the contactor K6 is connected with the first charging positive interface;

[0014] The negative contacts of the contactors K3, K4, K5 and K6 are respectively connected with the negative contact of the contactor K13 and the negative contact of the contactor K14;

[0015] The negative contact of the contactor K8 is connected with the first charging negative interface;

[0016] The negative contact of the contactor K9 is connected with the first charging negative interface;

[0017] The negative contact of the contactor K10 is connected with the first charging negative interface;

[0018] The negative contact of the contactor K11 is connected with the first charging negative interface;

[0019] The positive contacts of the contactors K8, K9, K10 and K11 are respectively connected with the first, second and third current sensors.

[0020] Further, the liquid cooling circuit comprises a contactor K7, wherein,

[0021] The negative contact of the contactor K7 is connected with the liquid cooling positive interface through a fuse;

[0022] The positive contacts of the contactor K7 are respectively connected with the negative contact of the contactor K13 and the negative contact of the contactor K14;

[0023] The liquid cooling negative interface is connected with the first, second and third current sensors.

[0024] Further, the discharging circuit comprises a contactor K1, a contactor K2, a pre-charge resistor and a contactor K12, wherein,

[0025] One end of the pre-charge resistor is connected with the positive contact of the contactor K1, and the negative contact of the contactor K1 is connected with the negative contact of the contactor K2;

[0026] The negative contact of the contactor K2 is further connected with the first and second discharging positive interfaces, and the positive contact of the contactor K2 is connected with the other end of the pre-charge resistor;

[0027] The positive contact of the contactor K2 is connected with the other end of the pre-charge resistor, and the negative contact of the contactor K13 and the negative contact of the contactor K14 are also connected with the other end of the pre-charge resistor respectively;

[0028] The positive contact of the contactor K12 is connected with the first discharge negative interface and the second discharge negative interface;

[0029] The negative contact of the contactor K12 is connected with the first current sensor, the second current sensor and the third current sensor respectively.

[0030] Further, a battery management system is also included, which is connected with the charging circuit, the discharging circuit and the liquid cooling circuit, and the battery management system includes a master host, a first slave host, a second slave host, a vehicle communication interface, a charging communication interface, an internal network communication interface and a debugging communication interface; wherein,

[0031] The master host is connected with the vehicle communication interface, the first slave host, the second slave host, the internal network communication interface, the contactor K1, the contactor K2, the contactor K7, the contactor K13 and the contactor K14 respectively;

[0032] The first slave host is connected with the master host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K3, the contactor K4, the contactor K8 and the contactor K9 respectively;

[0033] The second slave host is connected with the master host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K5, the contactor K6, the contactor K10 and the contactor K11 respectively.

[0034] Further, the cables of the discharge positive and negative can support 150 flat wire diameters at most, and the current can support 800A at most.

[0035] Further, a first insulation monitoring module and a second insulation monitoring module are also included, which are used to compare the acquired back-end voltage with the reference voltage, wherein,

[0036] The first insulation monitoring module is used to acquire the back-end voltage of the contactor K10 and the contactor K11 respectively;

[0037] The second insulation monitoring module is used to acquire the back-end voltage of the contactor K1 and the contactor K2, the contactor K3, the contactor K4, the contactor K5, the contactor K6, the contactor K7, the contactor K8, the contactor K9 and the contactor K12 respectively.

[0038] Further, the first insulation monitoring module is also used to collect the current of the contactor K13 and the contactor K14 loop by using the Hall, and to judge whether the contactor is faulty.

[0039] Further, the first insulation monitoring module is connected with the first slave host, and the second insulation monitoring module is connected with the inner network communication interface.

[0040] The high-voltage box of the utility model increases to four charging ports, increases charging current, reduces charging time, in addition, adopts liquid cooling circuit, removes traditional heating circuit, thereby adopts liquid cooling / liquid heating scheme to reduce the cost of heating film and related heating wire bundle, reduces the cost of high-voltage box, improves the reliability and safety of high-voltage box.

[0041] Other features and advantages of the present application will be further described in the following specification, and some of them will become apparent from the specification, or will be understood through implementation of the present application. The purpose and other advantages of the present application can be achieved and obtained through the structure indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0043] Figure 1 A high-voltage box schematic diagram of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0044] Figure 2 A positive electrode circuit connection schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0045] Figure 3 A negative electrode circuit connection schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0046] Figure 4 A battery management system connection schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0047] Figure 5 Another battery management system connection schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0048] Figure 6 A master host schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown;

[0049] Figure 7 A slave host schematic diagram in a high-voltage box of a four-gun fast-charging battery system in an embodiment of the utility model is shown.

[0050] Figure 8 The utility model discloses an insulating monitoring device schematic diagram of four gun fast charging battery system high pressure box. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the following will combine the drawings in the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely explained, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor are within the protection scope of the utility model.

[0052] As Figure 1 The utility model discloses a four gun fast charging battery system high pressure box, including charging circuit, discharge circuit and I liquid cooling circuit, charging circuit, discharge circuit and liquid cooling circuit are connected with battery respectively, wherein, charging circuit is connected with first charging interface anode, first charging negative pole interface, second charging anode interface, second charging negative pole interface, third charging anode interface, third charging negative pole interface, fourth charging anode interface and fourth charging negative pole interface respectively, liquid cooling circuit is connected with liquid cooling anode interface and liquid cooling negative pole interface respectively. Further, the high pressure box still includes contactor K13, contactor K14, first current sensor, second current sensor, third current sensor, contactor K13 is connected in parallel with contactor K14, and first current sensor, second current sensor, third current sensor are connected in parallel two by two, charging circuit, discharge circuit and liquid cooling circuit are connected to the anode of battery after being connected with contactor K13, contactor K14, charging circuit, discharge circuit and liquid cooling circuit are connected to the negative pole of battery after being connected with first current sensor, second current sensor, third current sensor respectively. The above-mentioned high pressure box increases to four charging port quantity, increases charging current, reduces charging time, in addition, adopts liquid cooling circuit to remove traditional heating loop, adopts liquid cooling / liquid heating scheme, reduces the cost of heating film and related heating wire bundle, reduces the cost of high pressure box, improves the reliability and safety of high pressure box.

[0053] Further specifically, as Figure 2 , 3, 5, the high voltage box is built in contactor K1, contactor K2, contactor K3, contactor K4, contactor K5, contactor K6, contactor K7, contactor K8, contactor K9, contactor K10, contactor K11, contactor K12, contactor K13, contactor K14, fuse F1, current sensor 1 (i.e. first current sensor), current sensor 2 (i.e. second current sensor), current sensor 3 (i.e. third current sensor), pre-charge resistor;The high voltage box is also provided with battery interface, discharge interface, fast charging interface, liquid cooling interface, whole vehicle communication interface, charging communication interface, internal network communication interface, debugging communication interface;Wherein, the battery interface is connected with the battery, and three batteries are provided in the embodiment of the utility model, and there are three battery interfaces, i.e. battery 1, battery 2 and battery 3.The discharge interface includes first discharge interface and second discharge interface, and discharge 1 and discharge 2 are used in the figure, the fast charging interface is charging interface, including first charging interface, second charging interface, third charging interface and fourth charging interface, and charging 1, charging 2, charging 3 and charging 4 are used in the figure.The battery interface, the charging interface, the discharge interface and the liquid cooling interface also include corresponding positive and negative interfaces, for example, the battery interface includes battery 1 positive, battery 2 positive, battery 3 positive, battery 1 negative, battery 2 negative and battery 3 negative.Further, the cable of the discharge positive and negative interface is supported to 150 flat wire diameter at most, and the current is supported to 800A at most, so that the reliability and safety of the high voltage box application are improved.

[0054] In the embodiment of the utility model, the high voltage box further includes a high voltage box shell, and all the interfaces are arranged on the outer wall of the high voltage box shell.

[0055] In the embodiment of the utility model, the contact (1) of the normally open switch of the contactor K1 is connected with the contact (2) of the normally open switch of the contactor K13 and the contact (2) of the normally open switch of the contactor K14 through the pre-charge resistor, the contact (1) of the normally open switch of the contactor K2, the contact (2) of the normally open switch of the contactor K3, the contact (2) of the normally open switch of the contactor K4, the contact (2) of the normally open switch of the contactor K5, the contact (2) of the normally open switch of the contactor K6 and the contact (1) of the normally open switch of the contactor K7, and the contact (1) of the normally open switch of the contactor K13 is connected with the contact (2) of the normally open switch of the contactor K14 in parallel.

[0056] The contact (1) of the normally open switch of the contactor K13 and the contact (1) of the normally open switch of the contactor K14 are connected with the positive pole of the battery system through MSD (Manual Service Disconnect: manual service disconnect switch);The contact (2) of the normally open switch of the contactor K1 and the contact (2) of the normally open switch of the contactor K2 are connected with the positive pole interfaces of discharge 1 and discharge 2 after being connected in parallel.

[0057] The contact (1) of the normally open switch of the contactor K3 is connected with the charging 1 positive pole interface (namely Figure 2 The contact (1) of the normally open switch of the contactor K4 is connected with the charging 2 positive pole interface; the contact (1) of the normally open switch of the contactor K5 is connected with the charging 3 positive pole interface; the contact (1) of the normally open switch of the contactor K6 is connected with the charging 4 positive pole interface; the contact (2) of the normally open switch of the contactor K7 is connected with the liquid cooling positive pole interface through the liquid cooling circuit fuse F1; the contact (1) of the normally open switch of the contactor K8 is connected with the liquid cooling negative pole interface; the contact (2) of the normally open switch of the contactor K8 is connected with the charging 1 negative pole interface; the contact (2) of the normally open switch of the contactor K9 is connected with the charging 2 negative pole interface; the contact (2) of the normally open switch of the contactor K10 is connected with the charging 3 negative pole interface; the contact (2) of the normally open switch of the contactor K11 is connected with the charging 4 negative pole interface; the contact (1) of the normally open switch of the contactor K8, the contact (1) of the normally open switch of the contactor K9, the contact (1) of the normally open switch of the contactor K10, the contact (1) of the normally open switch of the contactor K11, and the contact (2) of the normally open switch of the contactor K12 are connected in series and then connected with the battery system negative pole through the current sensor 1, the current sensor 2, and the current sensor 3;

[0058] The contact (1) of the normally open switch of the contactor K12 is connected with the discharging 1 and 2 negative pole interfaces; and the negative pole interfaces of the liquid cooling circuits are connected with the battery system negative pole through the current sensor 1, the current sensor 2, and the current sensor 3.

[0059] It should be noted that the contact (1) of the normally open switch of the contactor is the positive pole contact of the contactor, and the contact (2) of the normally open switch of the contactor is the negative pole contact of the contactor.

[0060] In the embodiment of the utility model, the liquid cooling circuit is used for closing the liquid cooling contactor K7 when the ambient temperature reaches a certain requirement, or opening the liquid cooling contactor K7 when the temperature is lower than the preset temperature, that is, the liquid cooling / liquid heating function can be opened according to the specific temperature judgment strategy. Therefore, the traditional heating circuit is removed in the embodiment of the utility model, the liquid cooling / liquid heating scheme is adopted, the cost of the heating film and the related heating wire harness is reduced, the cost of the high-voltage box is reduced, and the practicability of the high-voltage box is improved.

[0061] In the embodiment of the utility model, the high-voltage box further comprises a battery management system (also referred to as BMS: Battery Management System), as shown in Figure 4 The battery management system comprises a master host, a first slave host, a second slave host, a whole vehicle communication interface, a charging communication interface, an intranet communication interface, and a debugging communication interface; as shown inFigure 6 、 7 As shown in the figure, the main host is a C21-24V main host, the first slave host is a C21-24V slave host 1, and the second slave host is a C21-24V slave host 2; wherein C21 is the BMS host model, and 24V is the voltage power supply. The main host is connected with the whole vehicle communication interface, the first slave host, the second slave host, the internal network communication interface, the contactor K1, the contactor K2, the contactor K7, the contactor K13, and the contactor K14; the first slave host is connected with the main host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K3, the contactor K4, the contactor K8, and the contactor K9; and the second slave host is connected with the main host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K5, the contactor K6, the contactor K10, and the contactor K11.

[0062] Further, the main host processes the whole vehicle and battery system data, the slave host 1 and the slave host 2 process the charging data, and multiple main and standby machines are set to ensure the data safety and reliability.

[0063] The high-voltage box further comprises a first insulation monitoring module and a second insulation monitoring module. As shown in the figure, Figure 4 、 8 The first insulation monitoring module is an insulation monitoring H100B, and the second insulation monitoring module is an insulation monitoring H200B, which is used to compare the detected voltage at the back end of the contactor with the basic voltage to detect whether the contactor has a sticking fault. Wherein, the back end of the contactor is the connection between the back of the contactor and the high-voltage interface, specifically, when the above high-voltage box is applied, the voltage at the back end of the above K1-K12 twelve contactors is compared with the reference voltage before the high-voltage is applied. The voltage measurement point of each contactor is as shown in the figure, Figure 2 、 3As shown, the reference points of the corresponding voltage measurement points detected by the insulation monitoring H200B satisfy: the reference points of V1+, V3+, V4+ are V1-, the reference points of V2+, V5+, V6+, V7+ are V2-, the reference point of V8+ is V3-, the reference point of V9+ is V4-, and the reference point of V10+ is V5-. The reference points of the corresponding voltage measurement points detected by the second insulation monitoring module H100B satisfy: the reference point of V1+ is V1-, and the reference point of V2+ is V2-. Further, the insulation monitoring H200B monitors the following voltages: a reference voltage: V1- / V1+, wherein the reference voltage is the total voltage of the entire high-voltage box; a contactor K1, a contactor K2 rear-end voltage V1- / V3+; a contactor K3 rear-end voltage V2- / V5+; a contactor K4 rear-end voltage V2- / V6+; a contactor K5 rear-end voltage V2- / V2+; a contactor K6 rear-end voltage V1- / V4+; a contactor K7 rear-end voltage V2- / V7+; a contactor K8 rear-end voltage V3- / V8+; a contactor K9 rear-end voltage V4- / V9+; and a contactor K12 rear-end voltage V5- / V10+. Taking the contactor K1, the contactor K2 rear-end voltage V1- / V3+ as an example, the V1- / V3+ is compared with the reference voltage: V1- / V1+. If the difference between the contactor K1, the contactor K2 rear-end voltage V1- / V3+ and the reference voltage is within a preset range, it indicates that the contactor K1, the contactor K2 is normal.

[0064] The insulation monitoring H100D monitors the following voltages: a contactor K10 rear-end voltage V1- / V1+; a contactor K11 rear-end voltage V2- / V2+; and a K13, K14 contactor loop uses a Hall to collect a current to determine whether the contactor is faulty.

[0065] Further, the insulation monitoring H200B is also connected with an inner network communication interface, and the insulation monitoring H100B is also connected with a first slave host.

[0066] In the embodiment of the utility model, the high-voltage box supports full functions, other commercial vehicle projects can be subtracted on this model, and the high-voltage box is more universal.

[0067] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement is carried out to part technical features, and these modifications or replacements, do not make the essence of corresponding technical scheme deviate from the spirit and scope of the technical scheme of each embodiment of the utility model.

Claims

1. A four-gun fast-charging battery system high-voltage tank, characterized in that, The charging circuit, the discharging circuit and the liquid cooling circuit are connected with the battery respectively. The charging circuit is further connected with the first charging positive electrode interface, the first charging negative electrode interface, the second charging positive electrode interface, the second charging negative electrode interface, the third charging positive electrode interface, the third charging negative electrode interface, the fourth charging positive electrode interface and the fourth charging negative electrode interface respectively. The liquid cooling circuit is further connected with the liquid cooling positive electrode interface and the liquid cooling negative electrode interface respectively.

2. The four-gun fast-charge battery system high-voltage tank of claim 1, wherein, The contactor K13 and the contactor K14 are connected in parallel, and the first current sensor, the second current sensor and the third current sensor are connected in pairs in parallel. The charging circuit, the discharging circuit and the liquid cooling circuit are connected with the positive electrode of the battery after being connected with the contactor K13 and the contactor K14. The charging circuit, the discharging circuit and the liquid cooling circuit are connected with the negative electrode of the battery after being connected with the first current sensor, the second current sensor and the third current sensor respectively.

3. The four-gun fast-charge battery system high-voltage tank of claim 2, wherein, The charging circuit comprises the contactor K3, the contactor K4, the contactor K5, the contactor K6, the contactor K8, the contactor K9, the contactor K10 and the contactor K11. The positive electrode contact of the contactor K3 is connected with the first charging positive electrode interface. The positive electrode contact of the contactor K4 is connected with the first charging positive electrode interface. The positive electrode contact of the contactor K5 is connected with the first charging positive electrode interface. The positive electrode contact of the contactor K6 is connected with the first charging positive electrode interface. The negative electrode contacts of the contactor K3, the contactor K4, the contactor K5 and the contactor K6 are connected with the negative electrode contact of the contactor K13 and the negative electrode contact of the contactor K14 respectively. The negative electrode contact of the contactor K8 is connected with the first charging negative electrode interface. The negative electrode contact of the contactor K9 is connected with the first charging negative electrode interface. The negative electrode contact of the contactor K10 is connected with the first charging negative electrode interface. The negative electrode contact of the contactor K11 is connected with the first charging negative electrode interface. The positive electrode contacts of the contactor K8, the contactor K9, the contactor K10 and the contactor K11 are connected with the first current sensor, the second current sensor and the third current sensor respectively.

4. The four-gun fast-charge battery system high-voltage tank of claim 2, wherein, The liquid cooling circuit comprises the contactor K7. The negative electrode contact of the contactor K7 is connected with the liquid cooling positive electrode interface through a fuse. The positive electrode contacts of the contactor K7 are connected with the negative electrode contact of the contactor K13 and the negative electrode contact of the contactor K14 respectively. The liquid cooling negative electrode interface is connected with the first current sensor, the second current sensor and the third current sensor.

5. The four-gun fast-charge battery system high-voltage tank of claim 2, wherein, The discharging circuit comprises the contactor K1, the contactor K2, a pre-charge resistor and the contactor K12. One end of the pre-charge resistor is connected with the positive electrode contact of the contactor K1, and the negative electrode contact of the contactor K1 is connected with the negative electrode contact of the contactor K2. The negative electrode contact of the contactor K2 is further connected with the first discharging positive electrode interface and the second discharging positive electrode interface, and the positive electrode contact of the contactor K2 is connected with the other end of the pre-charge resistor. The positive contact of the contactor K2 is connected with the other end of the pre-charge resistor, and the negative contact of the contactor K13 and the negative contact of the contactor K14 are also connected with the other end of the pre-charge resistor respectively; The positive contact of the contactor K12 is connected with the first discharge negative interface and the second discharge negative interface; The negative contact of the contactor K12 is connected with the first current sensor, the second current sensor and the third current sensor respectively.

6. The four-gun fast-charge battery system high-voltage tank of any one of claims 1-5, wherein, The battery management system is also included, which is connected with the charging circuit, the discharging circuit and the liquid cooling circuit, and the battery management system includes a master host, a first slave host, a second slave host, a whole vehicle communication interface, a charging communication interface, an internal network communication interface and a debugging communication interface; wherein, The master host is connected with the whole vehicle communication interface, the first slave host, the second slave host, the internal network communication interface, the contactor K1, the contactor K2, the contactor K7, the contactor K13 and the contactor K14 respectively; The first slave host is connected with the master host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K3, the contactor K4, the contactor K8 and the contactor K9 respectively; The second slave host is connected with the master host, the charging communication interface, the internal network communication interface, the debugging communication interface, the contactor K5, the contactor K6, the contactor K10 and the contactor K11 respectively.

7. The four-gun fast-charge battery system high-voltage tank of claim 6, wherein, The cables of the discharge positive and negative can support 150 flat wire diameters at most, and the current can support 800A at most.

8. The four-gun fast-charge battery system high-voltage tank of claim 7, wherein, The first insulation monitoring module and the second insulation monitoring module are also included, which are used to compare the acquired back-end voltage with the reference voltage, wherein, The first insulation monitoring module is used to acquire the back-end voltage of the contactor K10 and the contactor K11 respectively; The second insulation monitoring module is used to acquire the back-end voltage of the contactor K1 and the contactor K2, the contactor K3, the contactor K4, the contactor K5, the contactor K6, the contactor K7, the contactor K8, the contactor K9 and the contactor K12 respectively.

9. The four-gun fast-charge battery system high-voltage tank of claim 8, wherein, The first insulation monitoring module is also used to collect the current of the contactor K13 and the contactor K14 loop by using the Hall, and to judge whether the contactor is faulty.

10. The four-gun fast-charge battery system high-voltage tank of claim 9, wherein, The first insulation monitoring module is connected with the first slave host, and the second insulation monitoring module is connected with the internal network communication interface.

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