CN210390846U - Battery high-voltage control system - Google Patents

Abstract

The utility model discloses a battery high voltage control system, including master control BMS, two at least input connector, two at least output connector, the general way of circular telegram, and two at least current sensor who corresponds with input connector, general way one end of circular telegram connects two at least input connector respectively, the other end connects two at least output connector respectively, current sensor gathers the electric current of the input connector input that corresponds respectively in order to obtain acquisition current, master control BMS receives each acquisition current, and whether compare each acquisition current surpass and predetermine the threshold value, to whole car system output current-limiting signal when arbitrary acquisition current surpasses and predetermine the threshold value. Compared with the prior art, the master control BMS detects and feeds back the fault condition of the circuit in real time, and when one circuit of the circuit breaks down, only a current limiting signal needs to be transmitted to a whole vehicle system so as to limit the current of the output current of the battery pack, and then partial electric power can be kept to be supplied to the whole vehicle to run, and the use safety of the electric vehicle is effectively guaranteed.

Description

Battery high-voltage control system

Technical Field

The utility model relates to an electric automobile battery power supply field especially relates to a battery high-voltage control system.

Background

Under the big background that electric automobile rises, heavy truck market demand is also more and more to the trend of electronization development, for passenger car and commercial car, heavy truck is proposing the demand of higher voltage and electric current (more high power), because the restriction of device specification, traditional electric automobile's battery high voltage control circuit can not provide enough big drive current to electric automobile's power supply, to having the electric automobile that drive power is very big such as some big trucks promptly, traditional battery high voltage control system can not satisfy its power consumption demand. In addition, when the existing battery high-voltage control circuit breaks down, the whole circuit needs to be directly cut off, the whole vehicle running of the electric vehicle is influenced, the service life of the relay is influenced due to the fact that the number of times of cutting off the relay with load is too large, and the use safety of the electric vehicle is influenced.

Therefore, a battery high voltage control system that can solve the above problems is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery high voltage control system can provide great drive current, and system safety and stability to electric automobile.

In order to realize purposefully, the utility model discloses a battery high pressure control system is applicable to electric automobile, and it includes main control BMS, two at least input connector, two at least output connector, circular telegram total way, and with two at least current sensor that input connector corresponds, circular telegram total way one end connects respectively two at least input connector, the other end connect respectively two at least output connector, current sensor gathers respectively correspondingly the electric current of input connector input is in order to obtain acquisition current, main control BMS receives each acquisition current, and compare each acquisition current whether surpasss and predetermines the threshold value, arbitrary acquisition current surpasss and output a current-limiting signal to whole car system when predetermineeing the threshold value.

Compared with the prior art, the utility model discloses a battery high voltage control system carries out current output through two at least branches, can provide great drive current to electric automobile to satisfy electric automobile's such as heavy truck's the demand of large voltage and heavy current. In addition, the current sensors respectively collect the current of corresponding branches (namely the current input by the input end of the input connector) to obtain the collected current, the main control BMS compares whether each collected current exceeds a preset threshold value, and when any collected current exceeds the preset threshold value, a current limiting signal is output to the whole vehicle system to inform the fault of the branch circuit of the whole vehicle system, so that the whole vehicle system can limit the output current of the battery pack according to the current limiting signal, the output current of the battery pack can be limited within the maximum working current range of the rest branches without cutting off a relay of the fault branch circuit, the overload damage of the rest branch circuit caused by the fault of any branch circuit is avoided, the safe operation of the whole vehicle in partial fault is ensured, the load cutting-off times of the relay are reduced, the service life of a device is prolonged, and.

Preferably, a relay for controlling the on-off of the current is arranged on the power-on main circuit.

Preferably, the power-on bus comprises a positive bus and a negative bus, the at least two input connectors comprise a first input connector and a second input connector, the at least two output connectors include a first output connector and a second output connector, one end of the positive pole main path is respectively connected with the positive pole of the first input connector and the positive pole of the second input connector to form a first positive pole branch path and a second positive pole branch path, the other end of the positive pole main path is respectively connected with the positive pole of the first output connector and the positive pole of the second output connector, one end of the negative pole main circuit is respectively connected with the negative pole of the first input connector and the negative pole of the second input connector to form a first negative pole branch circuit and a second negative pole branch circuit, the other end of the negative pole main circuit is respectively connected with the negative pole of the first output connector and the negative pole of the second output connector.

Preferably, the at least two current sensors include a first current sensor and a second current sensor, the first current sensor is connected to the first positive branch or the first negative branch for detecting the first current inputted from the first input connector, and the second current sensor is connected to the second positive branch or the second negative branch for detecting the second current inputted from the second input connector.

Preferably, the positive shunt is connected in series with a main positive relay, the negative shunt is connected in series with a main negative relay, the main control BMS includes a first control end and a second control end, and the first control end and the second control end are respectively connected with control coils of the main positive relay and the main negative relay to control on and off of contact switches of the main positive relay and the main negative relay.

Preferably, a manual maintenance switch is respectively connected in series to the first positive electrode shunt and the second positive electrode shunt.

Preferably, the battery high-voltage control system further includes a pre-charge resistor and a pre-charge relay, the pre-charge resistor and the pre-charge relay are connected in series to form a pre-charge circuit, two ends of the pre-charge circuit are respectively connected to two ends of the positive pole main circuit, a voltage output end of the main control BMS is connected to the positive pole main circuit to provide a preset pre-charge voltage to the pre-charge circuit, and the main control BMS includes a pre-charge control end electrically connected to a control coil of the pre-charge relay to control on/off of the pre-charge relay.

Preferably, the first input connector, the first output connector, the second input connector and the second output connector are all high voltage connectors.

Preferably, a main circuit fuse is connected in series to the positive pole main line.

Preferably, the first current sensor and the second current sensor are hall sensors.

Drawings

Fig. 1 is a schematic structural diagram of a battery high-voltage control system according to the present invention.

Fig. 2 is the connection block diagram of the battery high-voltage control system, the battery pack, the electric vehicle control system and the whole vehicle system of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

Referring to fig. 1, the battery high voltage control system 100 of the present embodiment can output two currents simultaneously to provide a larger driving current for an electric vehicle (not shown), is suitable for driving a large electric vehicle such as a heavy truck by using the existing conventional devices to output a higher voltage and current, when one branch circuit has a fault, the power supply of the whole vehicle is not required to be cut off by cutting off the relay, only a current limiting signal is required to be transmitted to the whole vehicle system 400, so that the normal system limits the output current of the battery pack 200, so that the output current of the battery pack 200 can be limited within the maximum working current range of the normal branch, thereby preventing the service life of the relay from being reduced due to repeated switching off of the relay, and the two paths of current output are prevented from simultaneously acting on the normal branch due to the fault of any branch, and the normal branch is prevented from being damaged due to overload, so that part of electric power is kept to be supplied to the whole vehicle to run under the condition of ensuring safety. The battery high-voltage control system 100 of the present embodiment is mainly directed to the battery pack 200 having the operating continuous current greater than 600A. The structure of the battery high-voltage control system 100 of the present embodiment will be described in detail below.

Referring to fig. 1 and 2, the battery high-voltage control system 100 of the present embodiment includes a main control BMS10, a main positive relay K1, a main negative relay K2, a first input connector 1, a first output connector 2, a second input connector 3, a second output connector 4, a positive pole main circuit 101 and a negative pole main circuit 102, wherein the positive pole main circuit 101 and the negative pole main circuit 102 together form a power-on main circuit. Wherein, one end of the positive pole main circuit 101 is respectively connected with the positive pole of the first input connector 1 and the positive pole of the second input connector 3 to form a first positive pole branch 104 and a second positive pole branch 105, the other end of the positive pole main circuit 101 is respectively connected with the positive pole of the first output connector 2 and the positive pole of the second output connector 4, one end of the negative pole main circuit 102 is respectively connected with the negative pole of the first input connector 1 and the negative pole of the second input connector 3 to form a first negative pole branch 106 and a second positive pole branch 107, the other end of the negative pole main circuit 102 is respectively connected with the negative pole of the first output connector 2 and the negative pole of the second output connector 4, the contact switch of the main positive relay K1 is connected in series with the positive pole main circuit 101, the contact switch of the main negative relay K2 is connected in series with the negative pole main circuit 102, and the two circuits of current are controlled to supply power to the outside simultaneously, the electric automobile is driven to run, and the operation is simple. Preferably, the first input connector 1, the first output connector 2, the second input connector 3 and the second output connector 4 are all high voltage connectors to ensure that each connector can work reliably under high voltage.

The main control BMS10 comprises a first control end a and a second control end b, the first control end a and the second control end b are respectively connected with control coils of the main positive relay K1 and the main negative relay K2 to control on and off of contact switches of the main positive relay K1 and the main negative relay K2, a battery voltage positive electrode pin c and a battery voltage negative electrode pin d of the main control BMS10 are respectively connected with the positive pole main circuit 101 and the negative pole main circuit 102, the main control BMS10 collects a voltage value of the positive pole main circuit 101 through the battery voltage positive electrode pin c and collects a voltage value of the negative pole main circuit 102 through the battery voltage negative electrode pin d, so that the main control BMS10 can obtain a current value flowing through the positive pole main circuit 101 and the negative pole main circuit 102 in real time.

Because the contact switch of main positive relay K1 is connected in series with positive pole main circuit 101, the contact switch of main negative relay K2 is connected in series with negative pole main circuit 102, first control end a and second control end b are connected with the control coils of main positive relay K1 and main negative relay K2 respectively, main control BMS10 can be as required, through the break-make of main positive relay K1 or main negative relay K2 of independent control, can control two-way electric current and supply power to the outside simultaneously, easy operation, when in operation, the positive pole of battery package 200 gets into battery high voltage control system 100 through first input connector 1 and second input connector 3 to export to electric automobile control system 300 via first output connector 2 and second output connector 4.

It should be noted that, the main positive relay K1 and the main negative relay K2 are both high-voltage relays, and the battery pack 200 has two current outputs, each of which has a corresponding positive electrode and a corresponding negative electrode. Two anodes of the battery pack 200 respectively enter the battery high-voltage control system 100 of the embodiment through the anode ports of the first input connector 1 and the second input connector 3 and then are connected in parallel, and then enter the main anode relay K1 after being connected in parallel, current detection is performed on each branch circuit (both the anode and the cathode) with the same polarity before entering the main anode relay K1 so as to be called by the main control BMS10, and the current detection is divided into two branch circuits after passing through the anode main circuit 101 and then enters the anode ports of the corresponding first output connector 2 and the second output connector 4 so as to output a high-voltage system to supply power for the whole vehicle. Correspondingly, two cathodes of the battery pack 200 respectively enter the battery high-voltage control system 100 of the present embodiment through the cathode ports of the first input connector 1 and the second input connector 3, are connected in parallel, enter the main negative relay K2 after being connected in parallel, are divided into two branches after being connected in parallel through the main negative relay K2, and are connected into the corresponding cathode ports of the first output connector 2 and the second output connector 4, so as to output a high-voltage system to supply power to the whole vehicle.

Referring to fig. 1, the battery high-voltage control system 100 of the present embodiment further includes a first current sensor H1 and a second current sensor H2, the first current sensor H1 detects a first current of the first positive branch 104, the second current sensor H2 detects a second current of the second positive branch 105, a current collecting terminal e of the main control BMS10 is connected to output terminals of the first current sensor H1 and the second current sensor H2, respectively, to obtain a detected first current value and a detected second current value, the main control BMS10 compares whether the detected first current value and the detected second current value exceed a preset threshold, and outputs a current limiting signal to the entire vehicle system 400 when one of the first current value and the second current value exceeds the preset threshold, and the entire vehicle system 400 limits the current of the output circuit of the battery pack 200 according to the current limiting signal. When any branch circuit has a fault, the main positive relay K1 or the main negative relay K2 does not need to be cut off, and only a current limiting signal needs to be transmitted to the whole vehicle system 400, so that the current of the input connector under the current branch circuit does not exceed the normal current range, and partial electric power can be provided for the whole vehicle to run under the condition of safety. In operation, the positive electrode of the battery pack 200 enters the battery high voltage control system 100 through the first input connector 1 and the second input connector 3, and is output to the electric vehicle control system 300 via the first output connector 2 and the second output connector 4.

Specifically, when one of the detected first current value and the detected second current value is smaller than a preset threshold, the entire vehicle system 400 does not limit the output current of the battery pack 200, and when one of the detected first current value and the detected second current value is greater than or equal to the preset threshold, the entire vehicle system 400 limits the output current corresponding to the battery pack 200 and limits the output current of the battery pack 200 within a certain preset range. The utility model discloses separately detect the electric current of two way inputs, carry out comparison operation according to the electric current signal that detects two anodal shunts to carry out centralized control, safe and reliable to main positive relay K1 and main relay K2 through main control BMS 10.

It should be noted that, in order to reduce the number of times of switching off the main positive relay K1 and the main relay K2 as much as possible, the battery high-voltage control system 100 of the present embodiment is in a normally closed state during normal use, and when any branch fails, the entire vehicle system 400 preferably limits the current of the output current of the battery pack 200 to ensure the entire vehicle operation. When the output current of the battery pack 200 is limited and the fault cannot be solved, if the whole battery high-voltage control system 100 has a fault or the first current value and the second current value are both greater than or equal to the preset threshold value, the main control BMS10 centrally controls the main positive relay K1 and the main relay K2 to simultaneously or individually disconnect any relay to stop the whole vehicle, so as to prevent accidents.

In another preferred embodiment, the first current sensor H1 detects a first current of the first negative shunt 106, the second current sensor H2 detects a second current of the second negative shunt 107, and the main control BMS10 performs a comparison operation according to the detected current values of the two negative shunts, in the same manner as the manner of connecting the two positive shunts, which is not described herein again.

It should be noted that, in the present embodiment, the first current sensor H1 and the second current sensor H2 are both hall current sensors, and the hall current sensors have high precision and sensitive induction, and effectively detect the current of the first positive shunt 104, the current of the second positive shunt 105, the current of the first negative shunt 106, and the current of the second negative shunt 107 in real time.

Referring to fig. 1, further, the battery high-voltage control system 100 further includes a pre-charge resistor R1 and a pre-charge relay K3, the pre-charge resistor R1 and the pre-charge relay K3 are connected in series to form a pre-charge circuit 103, two ends of the pre-charge circuit 103 are respectively connected to two ends of the positive pole main circuit 101, specifically, two ends of a contact switch of the main positive relay K1, a voltage output end of the main control BMS10 is connected to the positive pole main circuit 101 to provide a preset pre-charge voltage to the pre-charge circuit 103, and the main control BMS10 includes a pre-charge control end f electrically connected to a control coil of the pre-charge relay K3 to control on and off of the pre-charge relay. The normal charge and discharge flow of the pre-charge circuit 103 is consistent with the traditional design, the main control BMS10 monitors the current value of the two anode shunts or the two cathode shunts through the first current sensor H1 and the second current sensor H2, when an abnormal condition occurs in a single branch, the main control BMS10 can feed back the abnormal current to the whole vehicle system 400 in time, so as to limit the current of the output current corresponding to the battery pack 200 by the whole vehicle system 400, thereby realizing the whole current limiting of the electric vehicle, so that under the condition of ensuring safety, partial electric power can be provided for the whole vehicle to run, and the whole vehicle is prevented from completely stopping running due to the problem of the battery high-voltage control system 100.

Referring to fig. 1 and 2, the battery high-voltage control system 100 of the present embodiment further includes an internal communication interface 5 and an external communication interface 6 electrically connected to the main control BMS10, respectively, and both the internal communication interface 5 and the external communication interface 6 are low-voltage connectors to meet the communication requirement between the battery high-voltage control system 100 and external devices. Specifically, the main control BMS10 is electrically connected to the battery pack 200 through the internal communication interface 5 to acquire the sensing information of the battery pack 200, and is electrically connected to the electric vehicle control system 300 through the external communication interface 6 to acquire the sensing information and the control information of the electric vehicle.

Furthermore, a manual maintenance switch TB1 is respectively connected in series to the first positive shunt 104 and the second positive shunt 105, and when the first positive shunt 104 or the second positive shunt 105 needs to be maintained separately, maintenance can be performed only by controlling the on-off of the corresponding positive shunt through the corresponding manual maintenance switch TB1, and the on-off of the whole battery high-voltage control system 100 does not need to be controlled, so that it is ensured that one current is always output externally. The main circuit fuse FU1 is connected in series on the positive pole main circuit 101, when the current flowing through the positive pole main circuit 101 is too large, the main circuit fuse FU1 is automatically disconnected, and the damage to the battery high-voltage control system 100 of the embodiment caused by the too large current flowing through the battery high-voltage control system is effectively avoided.

It is worth noting that this embodiment provides the implementation of two way current output that two input connector, two output connector are constituteed, in other implementation, the utility model discloses can set up more input connector and output connector such as three, four or five of a quantity in order to constitute multichannel current output according to the power consumption demand of load to satisfy the power consumption demand of different loads, do not describe herein repeatedly.

As shown in fig. 1 and fig. 2, the battery high-voltage control system 100 of the present invention outputs current through at least two branches, and can provide a large driving current for the electric vehicle, so as to satisfy the requirements of large voltage and large current for the electric vehicles such as heavy trucks. In addition, the current sensors respectively collect the current of the corresponding branches (namely the current input by the input end of the input connector) to obtain the collected current, the main control BMS10 compares whether each collected current exceeds a preset threshold value, and when any collected current exceeds the preset threshold value, a current limiting signal is output to the whole vehicle system 400 to inform the whole vehicle system 400 of branch faults, so that the whole vehicle system 400 can limit the output current of the battery pack 200 according to the current limiting signal, the output current of the battery pack 200 can be limited within the maximum working current range of the remaining branches without cutting off a relay of the faulty branch, overload damage of the remaining branches due to fault of any branch is avoided, the safe operation of the whole vehicle is ensured when partial faults occur, the number of times of cutting off the load of the relay is reduced, the service life of devices is prolonged, and the system is.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims (10)

1. The utility model provides a battery high pressure control system, is applicable to electric automobile which characterized in that: including main control BMS, two at least input connector, two at least output connector, circular telegram are always said, and with two at least current sensor that input connector corresponds, circular telegram is always said one end and is connect respectively two at least input connector, and the other end connects respectively two at least output connector, current sensor gathers respectively the correspondence the electric current of input connector input is in order to obtain the acquisition current, main control BMS receives each acquisition current, and compares each acquisition current surpasss and predetermines the threshold value, arbitrary acquisition current surpasss and predetermine when threshold value to whole car system output a current-limiting signal.

2. The battery high voltage control system of claim 1, wherein: and a relay for controlling the on-off of the current is arranged on the power-on main circuit.

3. The battery high voltage control system of claim 1, wherein: the power-on main circuit comprises a positive main circuit and a negative main circuit, the at least two input connectors comprise a first input connector and a second input connector, the at least two output connectors include a first output connector and a second output connector, one end of the positive pole main path is respectively connected with the positive pole of the first input connector and the positive pole of the second input connector to form a first positive pole branch path and a second positive pole branch path, the other end of the positive pole main path is respectively connected with the positive pole of the first output connector and the positive pole of the second output connector, one end of the negative pole main circuit is respectively connected with the negative pole of the first input connector and the negative pole of the second input connector to form a first negative pole branch circuit and a second negative pole branch circuit, the other end of the negative pole main circuit is respectively connected with the negative pole of the first output connector and the negative pole of the second output connector.

4. The battery high voltage control system of claim 3, wherein: the at least two current sensors include a first current sensor and a second current sensor, the first current sensor is connected to the first positive branch or the first negative branch to detect a first current input by the first input connector, and the second current sensor is connected to the second positive branch or the second negative branch to detect a second current input by the second input connector.

5. The battery high voltage control system of claim 3, wherein: the main control BMS comprises a first control end and a second control end, wherein the first control end and the second control end are respectively connected with control coils of the main positive relay and the main negative relay so as to control the on-off of contact switches of the main positive relay and the main negative relay.

6. The battery high voltage control system of claim 3, wherein: and the first positive electrode shunt circuit and the second positive electrode shunt circuit are respectively connected with a manual maintenance switch in series.

7. The battery high voltage control system of claim 3, wherein: the pre-charging circuit comprises a pre-charging resistor and a pre-charging relay, the pre-charging resistor and the pre-charging relay are connected in series to form a pre-charging circuit, two ends of the pre-charging circuit are respectively connected to two ends of the positive pole main circuit, one voltage output end of the main control BMS is connected to the positive pole main circuit to provide preset pre-charging voltage for the pre-charging circuit, and the main control BMS comprises a pre-charging control end which is electrically connected with a control coil of the pre-charging relay to control the on-off of the pre-charging relay.

8. The battery high voltage control system of claim 3, wherein: the first input connector, the first output connector, the second input connector and the second output connector are all high voltage connectors.

9. The battery high voltage control system of claim 3, wherein: and the positive pole main circuit is connected with a main circuit fuse in series.

10. The battery high voltage control system of claim 4, wherein: the first current sensor and the second current sensor are hall sensors.

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