CN220628898U - Multi-battery grounding line protection system, battery module pack and vehicle - Google Patents

Abstract

The utility model discloses a multi-battery grounding line protection system, a battery module pack and a vehicle. The multi-battery grounding line protection system is connected with at least two batteries, and comprises: the protection modules are in one-to-one correspondence with each battery, wherein each protection module comprises a current conversion module, a comparison module and a switch module which are sequentially connected; the current conversion module in each protection module is electrically connected between the corresponding battery cathode of the protection module and the cathode common end of the battery, and each switch module is electrically connected between the corresponding battery anode of the protection module and the load driving circuit. According to the embodiment of the application, the output state of each battery grounding circuit can be effectively monitored, and the safety of supplying power to electric equipment by multiple batteries is improved.

Description

Multi-battery grounding line protection system, battery module pack and vehicle

Technical Field

The application belongs to the power management field, especially relates to a many batteries earth connection protection system, battery module package and vehicle.

Background

Along with the application scene of the electric equipment becoming wider and wider, in order to ensure that the electric equipment can acquire continuous and stable power input and improve the output power of the electric equipment, two or more batteries are often used, the anodes of different batteries are connected with different loads in the electric equipment, and the cathodes of a plurality of batteries are connected with each other to form a cathode common end, so that power supply of the electric equipment by multiple batteries is realized. In particular, for example, in the context of a vehicle as a consumer, two or more batteries are often provided in the vehicle to supply different loads in the vehicle.

Currently, in a circuit in which multiple batteries supply power to multiple loads of electric equipment, a common ground is commonly used by multiple batteries. When the circuit of the access ground wire of the battery fails, a loop is easily formed among the plurality of batteries through the load common end, and based on the current connection mode of the circuit, the current of all the batteries flows into the circuit of the access ground wire which does not fail through the loop and enters the common ground wire. Therefore, based on the current connection mode of the circuit, it is difficult to find out the fault of the battery circuit in time. Even the risk of burning out the ground line with too high a current of the ground line occurs. Therefore, a reliable protection circuit is needed to monitor the operation state of each battery grounding circuit in real time, and improve the safety of supplying power to the electric equipment by multiple batteries.

Disclosure of Invention

The utility model aims to provide a multi-battery grounding line protection system, a battery module pack and a vehicle, which can effectively monitor the output state of each battery grounding line and improve the safety of supplying power to electric equipment by a plurality of batteries.

In a first aspect, embodiments of the present application provide a multi-battery ground line protection system, the multi-battery ground line protection system being connected with at least two batteries, the multi-battery ground line protection system comprising: the protection modules are in one-to-one correspondence with each battery, wherein each protection module comprises a current conversion module, a comparison module and a switch module which are sequentially connected;

the current conversion module in each protection module is electrically connected between the corresponding battery cathode of the protection module and the cathode common end of the battery, and each switch module is electrically connected between the corresponding battery anode of the protection module and the load driving circuit;

in each protection module, the current conversion module is used for obtaining input current and converting the input current into detection voltage, wherein the input current is the current between the negative electrode of the battery corresponding to the protection module and the common end of the negative electrode; the comparison module is used for comparing the detection voltage with a preset reference voltage value and generating a control signal; and a switching module configured to be turned on or off in response to a control signal.

In one possible implementation, each comparison module is configured to generate a control signal for controlling the switching module to be turned off in case the detected voltage is greater than a preset reference voltage value.

In one possible implementation, each protection module further includes a data processor electrically connected to the current conversion module;

each data process is used for obtaining the detection voltage output by the current conversion module, and generating early warning information when the detection voltage exceeds a preset reference voltage range.

In one possible implementation manner, the current conversion module in each protection module comprises a current detection assembly and an amplifying circuit, wherein the current detection assembly is connected in series between the negative electrode of the corresponding battery of the protection module and the negative electrode common end of the battery;

the current detection component is used for acquiring the acquisition voltage of the input current;

the amplifying circuit is configured to amplify the acquisition voltage by a preset multiple to generate a detection voltage.

In one possible implementation manner, each current detecting component comprises a resistor with a preset resistance value, and the preset reference voltage range is between a first voltage value and a second voltage value;

the first voltage value is the ratio of the product of a first preset voltage and an amplification preset multiple to a preset value, the first preset voltage is the product of a preset current and a preset resistance, and the preset current is the sum of the maximum output currents of the batteries connected with the multi-battery grounding line protection system;

the second voltage value is the ratio of the product of the second preset voltage and the amplification preset multiple to the preset value, the first preset voltage is the sum of the second preset current and the preset resistance, and the second preset current is the sum of the minimum output currents of the batteries connected with the multi-battery grounding line protection system; the preset value is the total number of batteries connected with the multi-battery grounding line protection system.

In one possible implementation, the multi-battery ground line protection system includes first voltage conversion modules in one-to-one correspondence with the batteries;

the input end of each first voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each first voltage conversion module is connected with the operation voltage input end of each current conversion module in the multi-battery grounding line protection system;

each first voltage conversion module is used for converting the positive electrode output voltage of the battery into a first target operating voltage, and the first target operating voltage is provided for each current conversion module.

In one possible implementation manner, the multi-battery grounding line protection system further comprises a second voltage conversion module corresponding to the batteries one by one;

the input end of each second voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each second voltage conversion module is connected with the operation voltage input end of each comparison module in the multi-battery grounding line protection system;

the first voltage conversion module is used for converting the positive electrode output voltage of the battery into a second target operating voltage and providing the second target operating voltage for each comparison module.

In one possible implementation, the multi-battery ground line protection system further includes a master control switch between the master control switch and each protection module and the load;

the main control switch is connected with each switch module driving circuit;

the overall control switch is configured to turn off in response to at least one of the switch modules turning off.

In a second aspect, embodiments of the present application provide a battery module package including at least two batteries and the first aspect and the multi-battery ground line protection system in any one of the possible implementations of the first aspect.

In a third aspect, embodiments of the present application provide a vehicle including a multi-battery ground line protection system as in the first aspect and any one of the possible implementations of the first aspect.

The utility model provides a multi-battery grounding line protection system, a battery module pack and a vehicle. The multi-cell ground line protection system may be connected to at least two cells. Specifically, in the multi-battery ground line protection system, a protection module corresponding to each battery one by one may be included. Each protection module comprises a current conversion module, a comparison module and a switch module which are sequentially connected. The current conversion modules in each protection module are electrically connected between the corresponding battery cathodes of the protection modules and the cathode common end of the battery, so that in the process that the multi-battery supplies power to the electric equipment, the current conversion modules in each protection module can acquire the current between the corresponding battery cathodes of the protection modules and the cathode common end, namely the input current in real time. Each protection module converts the input current into detection voltage, and the comparison module compares the detection voltage with a preset reference voltage range to generate a control signal, so that the switch module is turned on or off. The switch module is positioned between the battery anode corresponding to the protection module and the load driving circuit, so that whether the battery continuously outputs current can be controlled by controlling the on or off of the switch module. Based on the multi-battery grounding line protection system provided by the embodiment of the application, the output state of the grounding line of each battery can be effectively detected, when the line fails and other abnormal states occur, the system can quickly respond, and the output state of the battery corresponding to the failure line can be timely adjusted, so that the safety of supplying power to electric equipment by the multi-battery is improved.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings that are needed to be used in the embodiments of the present utility model will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a multi-battery ground line protection system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of another multi-battery ground line protection system provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of still another multi-battery ground line protection system according to an embodiment of the present application;

fig. 4 is a schematic circuit diagram of a multi-battery ground line protection system according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of still another multi-battery ground line protection system according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present utility model will be described in detail below, and in order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are merely configured to illustrate the utility model and are not configured to limit the utility model. It will be apparent to one skilled in the art that the present utility model may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the utility model by showing examples of the utility model.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element. In the present specification, "a plurality of" means two or more, and "above" and "below" are inclusive.

Along with the application scene of the electric equipment becoming wider and wider, in order to ensure that the electric equipment can acquire continuous and stable power input and improve the output power of the electric equipment, two or more batteries are often used, the anodes of different batteries are connected with different loads in the electric equipment, and the cathodes of a plurality of batteries are connected with each other to form a cathode common end, so that power supply of the electric equipment by multiple batteries is realized. In particular, for example, in the context of a vehicle as a consumer, two or more batteries are often provided in the vehicle to supply different loads in the vehicle.

Currently, in a circuit in which multiple batteries supply power to multiple loads of electric equipment, a common ground is commonly used by multiple batteries. When the circuit of the access ground wire of the battery fails, a loop is easily formed among the plurality of batteries through the load common end, and based on the current connection mode of the circuit, the current of all the batteries flows into the circuit of the access ground wire which does not fail through the loop and enters the common ground wire. Therefore, based on the current connection mode of the circuit, it is difficult to find out the fault of the battery circuit in time. Even the risk of burning out the ground line with too high a current of the ground line occurs. Therefore, a reliable protection circuit is needed to monitor the operation state of each battery grounding circuit in real time, and improve the safety of supplying power to the electric equipment by multiple batteries.

Aiming at one or more problems, the utility model provides a multi-battery grounding line protection system, a battery module package and a vehicle, which can effectively detect the output state of a grounding line of each battery, and can quickly respond and timely adjust the output state of the battery corresponding to the fault line when the line fails and other abnormal states so as to improve the safety of supplying power to electric equipment by the multi-battery.

The following first describes a multi-battery ground line protection system provided in an embodiment of the present application. The multi-battery grounding line protection system can be connected with at least two batteries and comprises protection modules corresponding to each battery one by one, wherein each protection module comprises a current conversion module, a comparison module and a switch module which are connected in sequence; the current conversion module in each protection module is electrically connected between the corresponding battery cathode of the protection module and the cathode common end of the battery, and each switch module is electrically connected between the corresponding battery anode of the protection module and the load driving circuit; in each protection module, the current conversion module is used for obtaining input current and converting the input current into detection voltage, wherein the input current is current between the negative electrode of the battery corresponding to the protection module and the common end of the negative electrode, and the comparison module is used for comparing the detection voltage with a preset reference voltage value to generate a control signal; and a switching module configured to be turned on or off in response to a control signal.

By way of example, taking a multi-battery ground line protection system connected to two batteries as an example, fig. 1 is a schematic structural diagram of a multi-battery ground line protection system according to an embodiment of the present application. Referring to fig. 1, the multi-battery ground line protection system includes a protection module 100 and a protection module 200. The protection module 100 includes a current conversion module 110, a comparison module 120, and a switching module 130 connected in sequence. The protection module 200 includes a current conversion module 210, a comparison module 220, and a switching module 230, which are sequentially connected.

The current conversion module 110 is electrically connected between the negative electrode of the battery 1 corresponding to the protection module 100 and the negative electrode common terminal 300 of the battery, and the current conversion module 210 is electrically connected between the negative electrode of the battery 2 corresponding to the protection module 200 and the negative electrode common terminal 300 of the battery.

Wherein, battery 1 and battery 2 are used for supplying power to consumer 3 respectively. Specifically, the battery 1 may supply power to one load through the load driving circuit 31, and the battery 2 may supply power to the other load through the load driving circuit 32.

The switch module 130 is electrically connected between the positive electrode of the battery 1 corresponding to the protection module 100 and the load driving circuit 31. The switch module 230 is electrically connected between the positive electrode of the battery 2 corresponding to the protection module 200 and the load driving circuit 32.

Taking the protection module 100 as an example, in the process that the battery supplies power to the electric equipment 1, the protection module 100 can generate current corresponding to the negative electrode of the battery 1 and the negative electrode common terminal 300, and the current can be used as the input current of the current conversion module 110. Thus, the current conversion module 110 can obtain the current between the negative electrode of the battery 1 and the negative electrode common terminal 300 corresponding to the protection module 100 in real time. As a specific example, when the current between the negative electrode of the battery 1 and the negative electrode common terminal 300 is excessively small, it is explained that a circuit failure such as an open circuit may occur between the negative electrode of the battery 1 and the negative electrode common terminal 300. When the current between the negative electrode of the battery 1 and the negative electrode common terminal 300 is excessively large, a circuit failure such as heat generation is liable to occur. Therefore, the output state of the grounding circuit of each battery can be effectively detected through obtaining the current between the negative electrode of the battery and the load public end, and the circuit can be conveniently and quickly responded when the circuit is in an abnormal state such as a fault, so that the output state of the battery corresponding to the fault circuit can be timely adjusted.

Specifically, after the current conversion module 110 obtains the input current in real time, the input current may be converted into a detection voltage, and the comparison module 120 compares the detection voltage with a preset reference voltage value to generate a control signal. The control signal is used to control the switching module 130 to be turned on or off. Since the switch module 130 is located between the positive electrode of the battery 1 corresponding to the protection module 100 and the load driving circuit 31, when the switch module 130 is turned off, the battery 1 stops supplying power to the load 31 driving circuit, and when the switch module 130 is turned on, the battery 1 can continue supplying power to the load 31 driving circuit.

As a specific example, each comparison module is configured to generate a control signal for controlling the switch module to be turned off in case the detected voltage is greater than a preset reference voltage value.

For example, when there is an open condition in the ground line of the battery connected to the system, the current of the battery corresponding to the ground line switch will return to the negative common terminal through the other normal ground line, thereby resulting in an increase in the current of the normal ground line, and easily causing line heating. Once the rated current of the ground line is exceeded, line damage is also liable to occur, even causing a risk of battery burnout. Therefore, the state of the grounding line can be effectively detected by judging the relation between the detection voltage and the preset reference voltage value, and the safety of multi-battery power supply is improved.

In some embodiments, each protection module further comprises a data processor electrically connected to the current conversion module; each data process is used for obtaining the detection voltage output by the current conversion module, and generating early warning information when the detection voltage exceeds a preset reference voltage range.

Exemplary, a voltage reference range (V1, V2) is preset, wherein V1 is a minimum normal voltage and V2 is a maximum normal voltage.

In some embodiments, the current conversion module in each protection module includes a current detection component and an amplifying circuit, and the current detection component is connected in series between the negative electrode of the corresponding battery of the protection module and the negative electrode common terminal of the battery. Each current detection component is used for collecting the space between the negative electrode of the corresponding battery of the protection module and the negative electrode common end of the battery to obtain input current; the amplifying circuit is used for converting input current into voltage and amplifying the acquired voltage by a preset multiple to generate detection voltage.

Continuing with the example of the connection between the multi-battery ground line protection system and two batteries, fig. 2 is a schematic structural diagram of another multi-battery ground line protection system according to an embodiment of the present application. The current conversion module 110 in the protection module 100 includes an amplifying circuit 111 and a current detection component 112, and the current detection component 112 is connected in series between the negative electrode of the battery 1 corresponding to the protection module and the negative electrode common terminal 300 of the battery. The current conversion module 210 in the protection module 200 includes an amplifying circuit 211 and a current detection component 212, and the current detection component 212 is connected in series between the negative electrode of the battery 2 corresponding to the protection module and the negative electrode common terminal 300 of the battery.

Optionally, a resistor with a smaller resistance value can be set in the current detection resistor at the negative output end and the negative common end of each battery, so as to avoid excessive consumption of battery power. Because the current detection resistor is small, the voltage value generated when the current flows through the current detection resistor is directly based on the current, so that the detection result is easy to be inaccurate. In order to improve accuracy of detection results, in the embodiment of the application, input current of the current detection resistor is directly converted into acquisition voltage through an amplifying circuit, and the acquisition voltage is amplified by a preset multiple to generate detection voltage. And comparing the detected voltage with a preset reference voltage range, so as to judge whether the grounding circuit of the battery fails.

In some embodiments, the predetermined reference voltage range may be determined based on a sum of a predetermined resistance value, a minimum output current of a battery connected to the multi-battery ground line protection system, and a sum of maximum output currents of the battery connected to the multi-battery ground line protection system.

Specifically, each current detection component comprises a resistor with a preset resistance value, and a preset reference voltage range is between a first voltage value and a second voltage value;

the first voltage value is the ratio of the product of a first preset voltage and an amplification preset multiple to a preset value, the first preset voltage is the product of a preset current and a preset resistance, and the preset current is the sum of the maximum output currents of the batteries connected with the multi-battery grounding line protection system;

the second voltage value is the ratio of the product of the second preset voltage and the amplification preset multiple to the preset value, the first preset voltage is the sum of the second preset current and the preset resistance, and the second preset current is the sum of the minimum output currents of the batteries connected with the multi-battery grounding line protection system; the preset value is the total number of batteries connected with the multi-battery grounding line protection system.

Continuing with the example of the connection of the multi-battery ground line protection system to two batteries, the first voltage value may be calculated according to equation (1), and the second voltage value may be calculated according to equation (2).

I1＝ I _min *R1*β/2 (1)

I2＝I _max *R1*β/2 (2)

Wherein the first voltage value is I1, the second voltage value is I2, I _max For a first predetermined current, i.e. the sum of the maximum output currents of the batteries connected to the multi-battery ground line protection system, I _min And R is a preset resistance value of the resistor, and beta is the amplification factor.

Continuing with the protection module 100 as an example, fig. 3 is a schematic structural diagram of another multi-battery grounding line protection system according to an embodiment of the present application. As shown in connection with fig. 3, the data processor 140 acquires the generated detection voltage of the current conversion module 110, and the data processor 240 acquires the generated detection voltage of the current conversion module 210. Taking the data processor 140 as an example, comparing the detected voltage with a preset reference voltage range, when the detected voltage exceeds the preset reference voltage range, indicating that the current between the current conversion module 110 and the load common terminal 300 is abnormal, the data processor 140 can generate early warning information, so as to prompt a user to check the vehicle in time. Taking electric equipment as an example of a vehicle, the data processor can send early warning information to a display screen of the content of the vehicle, so that a driver is reminded to check the grounding line of the battery.

For example, when the detected voltage generated by the current conversion module 110 exceeds the preset voltage reference range, that is, the detected voltage is less than or equal to V1, or the detected voltage is greater than or equal to V2, the current between the negative electrode of the battery 1 and the negative electrode common terminal 300 may be considered to be too large or too small, so as to generate the early warning information, so as to adjust the power supply condition of the battery 1 to the load driving circuit 31 in time, for example, stop supplying power to the load 31.

Based on the multi-battery grounding line protection system provided by the embodiment of the application, the output state of the grounding line of each battery can be effectively detected, when the line fails and other abnormal states occur, the system can quickly respond, and the output state of the battery corresponding to the failure line can be timely adjusted, so that the safety of supplying power to electric equipment by the multi-battery is improved. In some embodiments, a multi-battery ground line protection system includes first voltage conversion modules in one-to-one correspondence with batteries; the input end of each first voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each first voltage conversion module is connected with the operation voltage input end of each current conversion module in the multi-battery grounding line protection system;

each first voltage conversion module is used for converting the positive electrode output voltage of the battery into a first target operating voltage, and the first target operating voltage is provided for each current conversion module.

For example, the first voltage conversion module corresponding to the battery 1 may perform conversion processing on the positive output voltage VDD1 of the battery 1, and convert the positive output voltage VDD1 into a voltage required by the operation of the current conversion module. The first voltage conversion module corresponding to the battery 2 can perform conversion processing on the positive output voltage VDD2 of the battery 2, and convert the positive output voltage VDD1 into a voltage required by the operation of the current conversion module.

Alternatively, the first voltage conversion module is, for example, a Direct Current-Direct Current (DCDC), a low dropout linear regulator, etc., which are listed here as examples.

According to the embodiment of the application, the first voltage conversion module is arranged corresponding to each battery, and each first voltage conversion module is connected with the operation voltage input ends of all the current conversion modules in the system, so that when any one battery has line faults, the current conversion modules can still work normally.

In some embodiments, the multi-battery ground line protection system further comprises a second voltage conversion module in one-to-one correspondence with the battery; the input end of each second voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each second voltage conversion module is connected with the operation voltage input end of each comparison module in the multi-battery grounding line protection system;

the first voltage conversion module is used for converting the positive electrode output voltage of the battery into a second target operating voltage and providing the second target operating voltage for each comparison module.

For example, the second voltage conversion module corresponding to the battery 1 may perform conversion processing on the positive output voltage VDD1 of the battery 1, and convert the positive output voltage VDD1 into a voltage required for the operation of the current conversion module. The second voltage conversion module corresponding to the battery 2 can perform conversion processing on the positive output voltage VDD2 of the battery 2, and convert the positive output voltage VDD1 into a voltage required by the operation of the current conversion module.

In order to more clearly illustrate the multi-battery ground line protection system provided in the embodiments of the present application, fig. 4 is a schematic circuit diagram of the multi-battery ground line protection system provided in the embodiments of the present application.

As shown in fig. 4, in the protection module corresponding to the battery 1, the current conversion module 110 includes a current detection resistor R1, an amplifying circuit Q1, a comparison module Q2, and a switch module Q3, and the first voltage conversion module may include a diode D1.

In the protection module corresponding to the battery 2, the current conversion module 210 includes a current detection resistor R2, an amplifying circuit Q4, a comparison module Q5, and a switch module Q6, and the first voltage conversion module may include a diode D2.

Illustratively, the current sensing resistor R1 is connected at both ends to IN+ (input positive), IN- (input negative) of the amplifying circuit Q1. The amplification factor of the amplifying circuit Q1 is preset to be β, and the amplifying circuit Q1 outputs a detection voltage vq1_out, where vq1_out=ir1×β, and I represents a current flowing through the current sensing resistor R1.

The two ends of the current detection resistor R2 are connected with IN+ (input positive) and IN- (input negative) of the amplifying circuit Q2. The amplification factor of the amplifying circuit Q2 is preset to be β, and the amplifying circuit Q1 outputs a detection voltage vq2_out, where vq2_out=ir2×β, and I represents a current flowing through the current sensing resistor R2.

As a specific example, the switch module 130 includes a drive circuit enabling signal for NPN transistors Q3, Q3 with their emitters grounded, and a collector control system of Q3, for example, a battery positive electrode may be connected, and a base of Q3 is connected to a signal input of the comparison module Q2. Illustratively, when the high level output by Q2 is used as the control signal, the emitter and collector are turned on, and at this time, the positive output current of the battery 1 is directly grounded through the emitter and collector, and the positive electrode of the battery 1 stops supplying the driving current to the load through the load driving circuit.

As a specific example, when the ground line of the battery 1 is open, the current flowing through the current detection resistor R1 is 0, vq1_out is 0, and the comparison module Q2 compares that vq1_out is smaller than the first voltage value. Q2 outputs a high level, and the power supply line of the battery 1 to the load is turned off by the switch Q3. The data processor 140 can determine that the current passing through R1 is abnormal, and can generate early warning information. Meanwhile, if the ground line of the battery 2 is a normal ground line, the battery 1 flows into the negative common terminal 300 through the ground line of the battery 2, and at this time, the current of the ground line of the battery 2 increases. Alternatively, the data processor 240 may acquire the detection voltage output from the current conversion module 210 at a predetermined acquisition frequency. The data processing 240 can determine that the current passing through R2 is abnormal by comparing the detected voltage with a preset reference voltage range, and generate early warning information.

Since the acquisition is usually performed by the data processor at a predetermined frequency, if the data processor acquires the detection voltage at a time interval after the ground line of the battery 1 is opened, and the acquisition process itself needs to take time, the ground line of the battery 2 needs to withstand a current exceeding a normal range for a certain time, which may cause a risk to the ground line where the battery 2 is located.

Therefore, IN the embodiment of the present application, a stable preset reference voltage value is set IN each protection module, and as shown IN fig. 4, taking the protection module 200 as an example, the amplifying circuit Q4 outputs the detection voltage vq4_out connected to in+ (input positive) of Q5, and the preset reference voltage value is connected to IN- (input negative) of the comparison module Q5. The switch module 130 includes NPN transistors Q6, where the base of the Q6 is connected to the output of the comparison module Q5, the emitter of the Q6 is grounded, and the collector of the Q6 is connected to the load driving circuit, so as to control the load driving circuit.

When the detection voltage vq4_out is greater than the preset reference voltage value, the control signal output by Q5 is at a high level, and at this time, the emitter and collector of Q6 are turned on, so that the enable signal of the load driving circuit is pulled down, and the driving current provided to the load by the load driving circuit through the battery 2 is reduced, so that the current of the grounding line of the battery 2 is in a preset current range, and the safe power supply of the battery is realized.

For example, as shown in connection with fig. 4, after conversion from the output voltage VDD1 of the battery 1, the operating voltage may be supplied to Q1, Q2, Q3, Q4. After conversion from the output voltage VDD2 of the battery 2, the operating voltage can be supplied to Q1, Q2, Q3, Q4. Wherein after conversion from the output voltage VDD1 of the battery 1, the operating voltage can be supplied to Q1, Q2, Q3, Q4. The VDD1 supplies power to the Q1 and Q2 through the diode D1, and the VDD2 supplies power to the Q1 and Q2 through the diode D2, so that it is possible to prevent that the VDD1 is not generated when the battery 1 is open in the positive pole or the corresponding voltage-reducing conversion module is damaged, and it is impossible to monitor whether the ground line of the battery 1 is through the current. According to the embodiment of the application, since each battery connected with the multi-battery grounding line protection system can provide operating voltage for each voltage conversion module and each comparison module in the system, even if the grounding line of one battery fails, the protection module can still normally operate, and the grounding line of each battery is protected.

In some embodiments, as shown in fig. 5, the multi-battery ground line protection system further includes a master control switch 400, between the master control switch 400 and each protection module and the load driving circuit; the main control switch is connected with each switch module; the overall control switch is configured to turn off in response to at least one of the switch modules turning off. According to the embodiment of the application, under any condition that the ground wire is open, the current of the battery grounding wire bundle can be actively reduced by detecting and failing, and the safety level of the automobile is improved.

In some embodiments, embodiments of the present application also provide a battery module package including at least two batteries and a multi-battery ground line protection system as provided by embodiments of the present application.

In some embodiments, the present application also provides a vehicle including a multi-battery ground line protection system as provided by the embodiments of the present application.

In the foregoing, only the specific embodiments of the present utility model are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing system embodiments, which are not repeated herein. It should be understood that the scope of the present utility model is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present utility model, and they should be included in the scope of the present utility model.

Claims (10)

1. The multi-battery grounding line protection system is characterized by being connected with at least two batteries, and comprises protection modules corresponding to each battery one by one, wherein each protection module comprises a current conversion module, a comparison module and a switch module which are connected in sequence;

the current conversion modules in each protection module are electrically connected between the corresponding battery negative electrode of the protection module and the negative electrode common end of the battery, and each switch module is electrically connected between the corresponding battery positive electrode of the protection module and the load driving circuit;

in each protection module, the current conversion module is used for obtaining input current and converting the input current into detection voltage, wherein the input current is current between a corresponding battery negative electrode of the protection module and the negative electrode common terminal; the comparison module is used for comparing the detection voltage with a preset reference voltage value and generating a control signal; the switch module is configured to be turned on or off in response to the control signal.

2. The multi-battery ground line protection system of claim 1, wherein each of the comparison modules is configured to generate a control signal for controlling the switching module to open if the detected voltage is greater than a preset reference voltage value.

3. The multi-cell ground line protection system of claim 1, wherein each of the protection modules further comprises a data processor electrically connected to the current conversion module;

each data process is used for obtaining the detection voltage output by the current conversion module and generating early warning information when the detection voltage exceeds a preset reference voltage range.

4. The multi-battery ground line protection system of claim 3, wherein the current conversion module in each protection module comprises a current detection assembly and an amplifying circuit, the current detection assembly is connected in series between the negative electrode of the corresponding battery of the protection module and the negative electrode common terminal of the battery;

the current detection component is used for acquiring the acquisition voltage of the input current;

the amplifying circuit is configured to amplify the acquired voltage by a preset multiple to generate the detection voltage.

5. The multi-battery ground line protection system of claim 4, wherein each of the current sensing components comprises a resistor of a predetermined resistance value, the predetermined reference voltage range being between a first voltage value and a second voltage value;

the first voltage value is the ratio of the product of a first preset voltage and the amplification preset multiple to a preset value, the first preset voltage is the product of a preset current and the preset resistance, and the preset current is the sum of the maximum output currents of batteries connected with the multi-battery grounding line protection system;

the second voltage value is the ratio of the product of a second preset voltage and the amplification preset multiple to the preset value, the first preset voltage is the sum of a second preset current and the preset resistance value resistor, and the second preset current is the sum of the minimum output current of the battery connected with the multi-battery grounding line protection system; the preset value is the total number of the batteries connected with the multi-battery grounding line protection system.

6. The multi-cell ground line protection system of claim 1, comprising a first voltage conversion module in one-to-one correspondence with the cells;

the input end of each first voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each first voltage conversion module is connected with the operation voltage input end of each current conversion module in the multi-battery grounding line protection system;

each first voltage conversion module is used for converting the positive electrode output voltage of the battery into a first target operating voltage, and the first target operating voltage is provided for each current conversion module.

7. The multi-cell ground line protection system of claim 6, further comprising a second voltage conversion module in one-to-one correspondence with the cells;

the input end of each second voltage conversion module is connected with the positive electrode output end of the corresponding battery, and the output end of each second voltage conversion module is connected with the operation voltage input end of each comparison module in the multi-battery grounding line protection system;

the first voltage conversion module is used for converting the positive electrode output voltage of the battery into a second target operating voltage, and providing the second target operating voltage for each comparison module.

8. The multi-cell ground line protection system of claim 1, further comprising a master control switch between the master control switch and each of the protection modules and a load;

the master control switch is connected with each switch module driving circuit;

the master control switch is configured to turn off in response to at least one switch module turning off.

9. A battery module pack comprising at least two batteries and the multi-battery ground line protection system according to any one of claims 1 to 8.

10. A vehicle comprising a multi-battery ground line protection system according to any one of claims 1 to 8.