CN107539149B - Control circuit, battery system and vehicle - Google Patents

Control circuit, battery system and vehicle Download PDF

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Publication number
CN107539149B
CN107539149B CN201710754950.7A CN201710754950A CN107539149B CN 107539149 B CN107539149 B CN 107539149B CN 201710754950 A CN201710754950 A CN 201710754950A CN 107539149 B CN107539149 B CN 107539149B
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switch
unit
contact
voltage
control circuit
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CN107539149A (en
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但志敏
侯贻真
史德龙
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Ningde Shidai Runzhi Software Technology Co ltd
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Contemporary Amperex Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract

The embodiment of the invention provides a control circuit, a battery system and a vehicle. The control circuit includes: the first end of each first contact switch unit is connected with one positive contact; the first end of each second contact switch unit is connected with one negative contact; the voltage division unit is connected between the second end of the first contact switch unit and the second end of the second contact switch unit; a control unit; the voltage transmission unit is used for transmitting the voltage between the first end of the voltage division unit and the second end of the voltage division unit to the control unit; at least two grounding switch units. Therefore, the technical scheme provided by the embodiment of the invention is used for simplifying the circuit structure in the battery system and reducing the cost.

Description

Control circuit, battery system and vehicle
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a control circuit, a battery system and a vehicle.
[ background of the invention ]
With the continuous development of the field of electric automobiles, the battery and related devices of the electric automobiles also have higher safety requirements. For example, in a Battery System of an electric vehicle, a Battery Management System (BMS) needs to collect a voltage in a high voltage circuit in real time in order to perform a precharge control of the high voltage System, a diagnosis of a State of a relay in the high voltage circuit, a State of Charge (SOC) of a Battery pack, and the like according to the collected voltage; for another example, in a battery system of an electric vehicle, the BMS needs to detect the insulation of the battery module, and obtain the insulation resistance values of the positive electrode and the negative electrode of the battery module with respect to the body of the electric vehicle, so as to evaluate the safety performance of the battery module of the electric vehicle according to the insulation resistance values.
In the field of existing electric automobiles, high-voltage sampling and insulation detection for a battery module in the electric automobile are generally realized through two sets of independent circuits.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
with the development of the battery industry of electric vehicles, how to reduce the cost of the battery system of the electric vehicle has become an important issue at present. In the prior art, circuits in a battery system of the electric automobile are independent and bear independent functions, so that the circuit structure is complex and the cost is high.
[ summary of the invention ]
Embodiments of the present invention provide a control circuit, a battery system and a vehicle, so as to simplify a circuit structure of the battery system and reduce cost.
In a first aspect, an embodiment of the present invention provides a control circuit, including:
the first end of each first contact switch unit is connected with a positive contact;
at least one second contact switch unit, wherein a first end of each second contact switch unit is connected with a negative contact;
the voltage division unit is connected between the second end of the first contact switch unit and the second end of the second contact switch unit;
a control unit;
the voltage transmission unit is connected with the first end of the voltage division unit, the second end of the voltage division unit, the first end of the control unit and the second end of the control unit; the voltage transmission unit is used for transmitting the voltage between the first end of the voltage division unit and the second end of the voltage division unit to the control unit;
the first end of each grounding switch unit is grounded, the second end of at least one grounding switch unit is connected to the first end of the control unit, and the second end of at least one grounding switch unit is connected to the second end of the control unit.
The above aspect and any possible implementation further provides an implementation, where the voltage transfer unit includes:
a first switch, a first end of which is connected with a first end of the voltage dividing unit;
a first end of the second switch is connected with a second end of the voltage division unit;
a third switch, a first end of the third switch being connected with a first end of the control unit;
a fourth switch, a first end of the fourth switch being connected with a second end of the control unit;
and a second end of the first switch and a second end of the third switch are both connected with a first end of the cross-over capacitor, and a second end of the second switch and a second end of the fourth switch are both connected with a second end of the cross-over capacitor.
The above aspect and any possible implementation further provides an implementation, in which each of the grounding switch units includes: a grounding switch;
the first end of the grounding switch is grounded;
the second end of at least one grounding switch is connected between the first end of the control unit and the voltage transmission unit, and the second end of at least one grounding switch is connected between the second end of the control unit and the voltage transmission unit.
The above aspect and any possible implementation further provide an implementation, where the grounding switch unit further includes:
the first end of the constant voltage source is grounded;
and the constant-voltage source divider resistor is connected between the second end of the constant-voltage source and the first end of the grounding switch.
The above aspect and any possible implementation further provide an implementation in which the voltage dividing unit is composed of a single resistor.
The above aspect and any possible implementation manner further provide an implementation manner in which the voltage dividing unit is composed of a plurality of resistors connected to each other.
The above aspect and any possible implementation manner further provide an implementation manner, where the voltage dividing unit includes:
a first resistor, a first end of which is connected with the at least one first contact switch unit;
a first end of the second resistor and a second end of the first resistor are connected with a first end of the cross-over capacitor;
and a first end of the third resistor is connected with the at least one second contact switch unit, and a second end of the third resistor and a second end of the second resistor are both connected with a second end of the cross-over capacitor.
The aspect and any possible implementation described above further provides an implementation in which each of the first contact switch units includes:
and a first end of the first contact switch is connected with one positive contact, and a second end of the first contact switch is connected with the voltage dividing unit.
The above aspect and any possible implementation further provide an implementation, in which each of the first contact switch units further includes:
and the first contact resistor is connected between the positive contact and the first end of the first contact switch.
The above aspect and any possible implementation further provide an implementation, where the number of the positive contacts is at least one;
the positive electrode contact includes: and at least one of the positive contact of the battery module, the outer side contact of the main positive relay and the outer side contact of the charging positive relay.
The aspect and any possible implementation described above further provides an implementation, in which each of the second contact switch units includes:
and a first end of the second contact switch is connected with the negative contact, and a second end of the second contact switch is connected with the voltage dividing unit.
The above aspect and any possible implementation further provide an implementation, in which each of the second contact switch units further includes:
and the second contact resistor is connected between the negative contact and the first end of the second contact switch.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the number of the negative electrode contacts is at least one;
the negative contact includes: and the negative contact of the battery module.
The above-described aspect and any possible implementation further provide an implementation, where the control circuit further includes:
the first voltage follower is connected between the voltage transmission unit and the first end of the control unit; and/or the presence of a gas in the gas,
and the second voltage follower is connected between the voltage transmission unit and the second end of the control unit.
In the aspect and any possible implementation manner described above, an implementation manner is further provided, and the control unit is a single chip microcomputer.
The above aspect and any possible implementation manner further provide an implementation manner, and the first switch, the second switch, the third switch, and the fourth switch are all optical coupling switches.
The above-described aspect and any possible implementation manner further provide an implementation manner, and each switch in the first contact switch unit is of a type of an opto-coupler switch.
The above aspect and any possible implementation manner further provide an implementation manner, and each switch in the second contact switch unit is an optocoupler switch.
The above aspect and any possible implementation manner further provide an implementation manner, where the types of the switches in the grounding switch unit include: a switch tube, an opto-coupler switch or a mechanical switch.
In a second aspect, an embodiment of the present invention provides a battery system, including:
a battery module;
the control circuit obtained by any one of the above-mentioned implementation manners.
In a third aspect, an embodiment of the present invention provides a vehicle, including: the battery system is provided.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, on one hand, a first contact switch unit in a control circuit is connected with an anode contact, a second contact switch unit is connected with a cathode contact, the first contact switch unit is connected with the second contact switch unit through a voltage division unit, and a voltage signal between a first end and a second end of the voltage division unit can be transmitted to the control unit through the voltage transmission unit, so that the control unit in a low-voltage loop can acquire a voltage value between the first end and the second end of the voltage division unit through the voltage signal transmitted by the voltage transmission unit, and therefore, based on a voltage division principle of the voltage division unit, the voltage value between the anode contact and the cathode contact which are connected at present can be acquired; on the other hand, a first contact switch unit and a second contact switch unit in the control circuit are controlled to be sequentially closed, and a grounding switch unit is controlled to be closed in the process, so that the control unit can acquire voltage values of the first end and the second end of the voltage division unit, and then the insulation resistance value of the battery module can be acquired according to a equation solving mode based on the principle that the inflow current and the outflow current of the end points are consistent; that is to say, compared with the mode of using two independent circuits to realize sampling and detection in the prior art, the technical scheme provided by the embodiment of the invention can realize high-voltage sampling and insulation detection by using one control circuit, thereby greatly simplifying the circuit structure in the battery system, reducing the whole volume of the control circuit, and reducing the circuit cost based on the simplification of the circuit structure, thereby reducing the cost of the whole battery system.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of a control circuit according to the present invention;
fig. 2 is an electrical schematic diagram of a battery module in an embodiment of the invention;
fig. 3 is a schematic structural diagram of a second embodiment of a control circuit according to the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of a control circuit according to the present invention;
fig. 5 is a schematic structural diagram of a fourth embodiment of a control circuit according to the present invention;
FIG. 6 is a flow chart of a control method according to an embodiment of the present invention;
FIG. 7 is an equivalent circuit diagram of the control circuit shown in FIG. 5 for implementing high voltage sampling;
FIG. 8 is a schematic diagram of a working flow of a control circuit for implementing high voltage sampling according to an embodiment of the present invention;
FIG. 9 is an equivalent circuit diagram of the control circuit shown in FIG. 5 for implementing insulation detection;
FIG. 10 is a schematic diagram of a working flow of a control circuit for implementing insulation detection according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a battery system according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the switches, etc. in embodiments of the present invention, the switches should not be limited to these terms. These terms are only used to distinguish the switches from each other. For example, a first switch may also be referred to as a second switch, and similarly, a second switch may also be referred to as a first switch, without departing from the scope of embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Aiming at the problems of complex circuit structure and high cost of a battery system of an electric automobile in the prior art, the embodiment of the invention provides the following solution ideas: the control circuit is provided, and two functions of high-voltage sampling and insulation detection are realized by using the control circuit, so that the complexity of the circuit is reduced, and the cost is saved.
Under the guidance of this idea, the present embodiment provides the following feasible embodiments.
The embodiment of the invention provides a control circuit, a battery system and a vehicle, which are used for simplifying a circuit structure in the battery system and reducing the cost.
Specifically, please refer to fig. 1, which is a schematic structural diagram of a first embodiment of a control circuit according to an embodiment of the present invention, as shown in fig. 1, the control circuit includes:
at least one first contact switch unit 11, a first end of each first contact switch unit 11 is connected with a positive contact;
at least one second contact switch unit 12, a first end of each second contact switch unit 12 being connected to one negative contact;
a voltage dividing unit 13 connected between the second end of the first contact switching unit 11 and the second end of the second contact switching unit 12;
a control unit 14;
the voltage transmission unit 15, the voltage transmission unit 15 is connected with the first end of the voltage division unit 13, the second end of the voltage division unit 13, the first end of the control unit 14 and the second end of the control unit 14; the voltage transmitting unit 15 is configured to transmit a voltage between a first end of the voltage dividing unit 13 and a second end of the voltage dividing unit 13 to the control unit 14;
at least two grounding switch units 16, a first end of each grounding switch unit 16 (including the first grounding switch unit 161 and the second grounding switch unit 162 in fig. 1) is grounded, a second end of at least one grounding switch unit 161 is connected to the first end of the control unit 14, and a second end of at least one grounding switch unit 162 is connected to the second end of the control unit 14.
When the control circuit as shown in fig. 1 is operating, the method may be performed in the control unit 14 in the control circuit as shown in fig. 1. The specific components of the control unit 14 in the embodiments of the present invention are not particularly limited.
In a specific application scenario, the control Unit 14 shown in fig. 1 may be a Micro Controller Unit (MCU), that is, a single chip microcomputer.
Alternatively, in another specific application scenario, if the control circuit is disposed in the BMS, the control unit 14 shown in fig. 1 may be a control part of the entire BMS. For example, when the control part of the BMS is a control chip, a control method for controlling the control circuit is performed in the control chip.
In the embodiment of the invention, the first end and the second end of the control unit are used for collecting voltage signals. In a specific implementation, a sampling device for collecting the voltage signal may be provided or integrated in the control unit. For example, two Analog-to-Digital converters (ADCs) may be disposed in the control unit, where the first terminal of the control unit is a first ADC sampling terminal and the second terminal of the control unit is a second ADC sampling terminal.
In the embodiment of the present invention, in view of that it is generally necessary to collect voltage values of a plurality of different contacts to be tested with respect to the negative contact when performing the high voltage sampling step, in the embodiment of the present invention, at least one first contact switch unit and at least one second contact switch unit may be provided.
Specifically, in the embodiment of the present invention, the number of the positive electrode contacts may be at least one. The positive contact according to the embodiment of the present invention may include, but is not limited to: at least one of the positive contact of the battery module, the outer side contact of the main positive relay, and the outer side contact of the charging positive relay.
In the embodiment of the present invention, the number of the negative electrode contacts may be at least one. Negative contacts according to embodiments of the present invention may include, but are not limited to: and a negative contact of the battery module.
To more specifically describe the positional relationship between the positive contact and the negative contact, please refer to fig. 2, which is an electrical schematic diagram of the battery module according to the embodiment of the present invention. As shown in fig. 2, the electrical schematic diagram of the battery module includes: the system comprises a battery module 21, a main positive relay 22, a pre-charging relay 23, a pre-charging resistor 24, a main negative relay 25, a charging positive relay 26, a motor 27 and a charger (charger) 28.
As shown in fig. 2, one end of the main positive relay 22 is connected to the positive electrode of the battery module 21, the other end of the main positive relay 22 is connected to one end of the motor 27, the other end of the motor 27 is further connected to the first end of the main negative relay 25, and the second end of the main negative relay 25 is connected to the negative electrode of the battery module 21; one end of the charging positive relay 26 is connected with the positive electrode of the battery module 21, the other end of the charging positive relay 26 is connected with one end of the charger 28, and the other end of the charger 28 is connected with the first end of the main negative relay 25; the pre-charge resistor 24 and the pre-charge relay 23 are connected in series to form a pre-charge control circuit, and the pre-charge control circuit is connected in parallel to two ends of the main positive relay 22.
Based on the electrical structure of the battery module as shown in fig. 2, the negative contact of the battery module is the negative contact of the battery module 21 in fig. 2, which is labeled B-in fig. 2; the positive contact of the battery module is the positive contact of the battery module 21 in fig. 2, and is also the inner side contact of the main positive relay 22, and the contact is marked as B + in fig. 2; the outer contact of the main positive relay 22 is identified as P + in fig. 2; the outer contact of Charge positive relay 26 is identified as Charge + in fig. 2.
In the control circuit provided by the embodiment of the invention, the number of the first contact switch units is at least one. Each of the first contact switch units includes: and the first end of the first contact switch is connected with one positive contact, and the second end of the first contact switch is connected with the voltage dividing unit.
In a specific application scenario, a first contact resistor may be further disposed in the first contact switch unit, and a partial voltage division function is performed by the first contact resistor, so as to reduce the voltage division pressure of the voltage division unit.
At this time, the first contact switch unit further includes: and the first contact resistor is connected between the positive contact and the first end of the first contact switch.
The first contact resistance may be added or deleted in the first contact switch unit according to actual needs, and the number and connection method of the first contact resistances are not particularly limited in the embodiment of the present invention.
At this time, referring to the control circuit shown in fig. 1, the control circuit includes 3 first contact switch units:
a first contact switch unit 111 including: the battery module comprises a first contact switch 111-1 and a first contact resistor 111-2, wherein a first end of the first contact switch 111-1 is connected with a positive contact (B +) of the battery module, a second end of the first contact switch 111-1 is connected with one end of the first contact resistor 111-2, and the other end of the first contact resistor 111-2 is connected with the voltage dividing unit 13;
a first contact switch unit 112, comprising: a first contact switch 112-1 and a first contact resistor 112-2, wherein a first end of the first contact switch 112-1 is connected with an outer contact (P +) of the main positive relay, a second end of the first contact switch 112-1 is connected with one end of the first contact resistor 112-2, and the other end of the first contact resistor 112-2 is connected with the voltage dividing unit 13;
the first contact switch unit 113 includes: the charging device comprises a first contact switch 113-1 and a first contact resistor 113-2, wherein a first end of the first contact switch 113-1 is connected with an outer contact (Charge +) of the charging positive relay, a second end of the first contact switch 113-1 is connected with one end of the first contact resistor 113-2, and the other end of the first contact resistor 113-2 is connected with the voltage dividing unit 13.
In the control circuit provided by the embodiment of the invention, the number of the first contact switch units is at least one. Each of the first contact switch units includes: and the first end of the first contact switch is connected with one positive contact, and the second end of the first contact switch is connected with the voltage dividing unit.
In the embodiment of the invention, the first contact switch unit is connected to the high-voltage part of the whole battery system, so that a switch with higher high-voltage resistance can be selected as the first contact switch in order to ensure the safety performance of the control circuit. In a specific implementation, each switch in the first contact switch unit may be an opto-coupler switch.
In a specific application scenario, the first contact switch unit may further include: and the first contact resistor is connected between the positive contact and the first end of the first contact switch. In this way, by providing the first contact resistor in the first contact switch unit, the first contact resistor can bear a partial voltage dividing effect, and the voltage dividing pressure of the voltage dividing unit can be reduced.
The first contact resistance may be added or deleted in the first contact switch unit according to actual needs, and the number and connection method of the first contact resistances are not particularly limited in the embodiment of the present invention.
In the control circuit provided by the embodiment of the invention, the number of the second contact switch units is at least one. Each of the second contact switch units includes: and a first end of the second contact switch is connected with one negative contact, and a second end of the second contact switch is connected with the voltage dividing unit.
In the embodiment of the invention, the second contact switch unit is connected to the high-voltage part of the whole battery system, so that a switch with higher high-voltage resistance can be selected as the second contact switch in order to ensure the safety performance of the control circuit. In a specific implementation, each switch in the second contact switch unit may be an opto-coupler switch.
In a specific application scenario, the second contact switch unit may further include: and the second contact resistor is connected between the negative contact and the first end of the second contact switch. In this way, by providing the second contact resistance in the second contact switch unit, the second contact resistance can partially perform the voltage dividing function, and the voltage dividing pressure of the voltage dividing unit can be reduced.
The second contact resistance may be added or deleted in the second contact switch unit according to actual needs, and the number and connection method of the second contact resistances are not particularly limited in the embodiment of the present invention.
At this time, referring to the control circuit shown in fig. 1, the control circuit includes 1 second contact switch unit 12, and the second contact switch unit includes: a first end of the second contact switch 12-1 is connected with a negative contact (B-) of the battery module, a second end of the second contact switch 12-1 is connected with one end of a second contact resistor 12-2, and the other end of the second contact resistor 12-2 is connected with the voltage dividing unit 13.
It can be understood that, based on the difference of the electrical structures of the battery modules and the difference of the selected contact to be tested, the contact to be tested connected between the first contact switch unit 11 and the second contact switch unit 12 in the control circuit shown in fig. 1 and the structure of the contact resistance connected thereto may also be adaptively adjusted as needed, which is not particularly limited in the embodiment of the present invention.
Hereinafter, a control principle for realizing high voltage sampling and insulation detection by the control circuit shown in fig. 1 will be described.
First, as shown in fig. 1, when the control circuit is used to perform high voltage sampling, the first contact switch unit 11 corresponding to a target positive contact currently requiring voltage acquisition may be closed, and the second contact switch unit 12 corresponding to a target negative contact currently requiring voltage acquisition may be closed, such that the first contact switch unit 11 and the second contact switch unit 12 are connected through the voltage dividing unit 13, that is, a serial loop is formed among the first contact switch unit 11, the voltage dividing unit 13, and the second contact switch unit 12, and a voltage signal between a first end and a second end of the voltage dividing unit 13 may be transmitted to the control unit 14 through the voltage transmitting unit 15, such that, through the voltage signal transmitted by the voltage transmitting unit 15, the control unit 14 located in a low voltage loop may acquire a voltage value between the first end and the second end of the voltage dividing unit 13, therefore, based on the voltage dividing principle of the voltage dividing unit 13, the voltage value between the currently connected target positive contact and the target negative contact can be acquired.
Secondly, as shown in fig. 1, when the control circuit is used for performing insulation detection, the first contact switch unit corresponding to the positive contact of the battery module may be closed first, and the voltage transmission unit and a grounding unit are closed at the same time, so that the control unit may acquire a voltage value at an end point (taking the first end of the voltage division unit as an example) connected between the voltage division unit and the voltage transmission unit, and then, based on that the current flowing in and the current flowing out from the first end of the voltage division unit are the same, a first relation equation including the insulation resistance value of the battery module may be obtained; similarly, the second contact switch unit corresponding to the negative contact of the battery module is closed, and meanwhile, the voltage transmission unit and the other grounding unit are closed, so that the control unit can acquire a voltage value at an end point (taking the second end of the voltage division unit as an example) connected between the voltage division unit and the voltage transmission unit, and then, based on the fact that the current flowing in and the current flowing out at the second end of the voltage division unit are consistent, a second relation equation including the insulation resistance value of the battery module can be obtained; therefore, according to the first relation equation and the second relation equation, the insulation resistance value of the battery module can be obtained by solving the equation set.
Based on the above steps, the control circuit provided by the embodiment of the invention can realize high-voltage sampling and insulation detection by using one control circuit, and compared with the mode of realizing sampling and detection by using two independent circuits in the prior art, the technical scheme provided by the embodiment of the invention greatly simplifies the circuit structure in the battery system and also reduces the whole volume of the control circuit, and the circuit cost is reduced based on the simplification of the circuit structure, thereby reducing the cost of the whole battery system.
Hereinafter, specific constituent structures of the respective units in the embodiments of the present invention will be specifically described.
First, referring to fig. 3, which is a schematic structural diagram of a second embodiment of the control circuit according to the present invention, as shown in fig. 3, a voltage transmitting unit 15 in the control circuit includes:
a first switch 151, a first end of the first switch 151 being connected to a first end of the voltage dividing unit 13;
a second switch 152, a first end of the second switch 152 is connected with a second end of the voltage dividing unit 13;
a third switch 153, a first end of the third switch 153 being connected to a first end of the control unit 14;
a fourth switch 154, a first terminal of the fourth switch 154 being connected to a second terminal of the control unit 14;
a second terminal of the first switch 151 and a second terminal of the third switch 153 are connected to a first terminal of the cross capacitor 155, and a second terminal of the second switch 152 and a second terminal of the fourth switch 154 are connected to a second terminal of the cross capacitor 155.
In the control circuit shown in fig. 3, the connection relationship between the remaining units and devices is shown in fig. 1, and is not described again.
Based on the structure of the voltage transfer unit 15 of the control circuit as shown in fig. 3, the step of the voltage transfer unit 15 actually implementing the voltage transfer function may include:
first, the first switch 151 and the second switch 152 may be closed, such that the crossover capacitor 155 is equivalent to be connected in parallel between the first end and the second end of the voltage dividing unit 13, and then, when the first contact switch unit 11 and the second contact switch unit 12 are both closed, the currently connected positive contact and the currently connected negative contact are connected through the voltage dividing unit 13 and the crossover capacitor 155 connected in parallel between the first end and the second end of the voltage dividing unit 13, and at this time, the currently connected positive contact and the currently connected negative contact charge the crossover capacitor 155.
Thus, when the first switch 151 and the second switch 152 are closed for a period of time, that is, when the across capacitor 155 is charged for a period of time, the voltage across the capacitor 155 is stabilized; at this time, the divided voltage between the first end and the second end of the voltage dividing unit 13 is equal to the divided voltage across the capacitor 155.
The first switch 151 and the second switch 152 are turned off.
Then, the third switch 153 and the fourth switch 154 are closed, so that the across capacitor 155 is connected to the control unit 14, and the control unit 14 can collect the voltage across the across capacitor 155, so that the control unit 14 obtains the voltage between the first terminal and the second terminal of the voltage dividing unit 13.
In actually implementing the above steps, considering that the voltage of the battery module of the vehicle is large and the current in the control unit 14 may be small, the left side of the voltage transfer unit 15 in fig. 3 is a high voltage portion, and the side of the right side including the control unit 14 is a low voltage portion.
On one hand, as shown in fig. 3, in order to ensure that the voltage transfer unit 15 can bear high voltage and perform a good voltage transfer function, considering that the voltage transfer unit 15 is connected between the high voltage part and the low voltage part, in an actual application process, the types of the first switch 151, the second switch 152, the third switch 153, and the fourth switch 154 are all optical coupling switches. The optocoupler switch has good effects of isolating high voltage and low voltage, and the safety performance of the control circuit can be further improved by adopting the optocoupler switch.
On the other hand, in order to further ensure safety when switching from high voltage to low voltage, the third switch 153 and the fourth switch 154 may be closed after a specified time interval after opening the first switch 151 and the second switch 152, so as to prevent the device from being burned out due to excessive instantaneous current of the low voltage part caused by the connection of the high voltage and the low voltage due to the excessively fast speed of the switches.
In an embodiment of the present invention, each of the ground switch units includes: a grounding switch;
the first end of the grounding switch is grounded;
the second end of the at least one grounding switch is connected between the first end of the control unit and the voltage transmission unit, and the second end of the at least one grounding switch is connected between the second end of the control unit and the voltage transmission unit.
In the embodiment of the present invention, the earthing switch units are all connected to the low-voltage portion, and therefore, there is no particular limitation on the switch type of each earthing switch in each earthing switch unit. In an actual implementation process, the switch type of each grounding switch in each grounding switch unit may include: a switch tube, an opto-coupler switch or a mechanical switch.
In the actual implementation process, when insulation detection is performed, if the second contact switch unit is closed, the whole communicated loop is connected to the negative electrode of the battery module, and therefore the voltage acquired by the control unit is a negative value, which may affect the detection accuracy of the control unit, and therefore, in the actual implementation process, a constant voltage source may be added to the grounding unit.
Therefore, in one possible implementation scenario, the grounding switch unit may further include:
the first end of the constant voltage source is grounded;
and the constant voltage source divider resistor is connected between the second end of the constant voltage source and the first end of the grounding switch.
It should be noted that, in the embodiment of the present invention, the number of the ground switch units is at least two, and all the ground switch units are not required to be connected to the constant voltage source and the constant voltage source divider resistor.
At this time, referring to fig. 4, which is a schematic structural diagram of a third embodiment of the control circuit provided in the embodiment of the present invention, as shown in fig. 4, the ground switch unit 16 in the control circuit includes:
a first grounding switch unit 161 including a first grounding switch 161-1, a first end of the first grounding switch 161-1 is grounded, and a second end of the first grounding switch 161-1 is connected between the first end of the control unit 14 and the first end of the third switch 153;
a second ground switch unit 162 including a second ground switch 162-1, wherein a first end of the second ground switch 162-1 is grounded, and a second end of the second ground switch 162-1 is connected between a second end of the control unit 14 and a first end of the fourth switch 154;
the third ground switch unit 163 includes:
a third ground switch 163-1, a second terminal of the third ground switch 163-1 being connected between the second terminal of the control unit 14 and the first terminal of the fourth switch 154;
a constant voltage source 163-2, a first end of the constant voltage source 163-2 being connected to ground;
and a constant voltage source divider resistor 163-3 connected between the second terminal of the constant voltage source 163-2 and the first terminal of the third ground switch 163-1.
In the control circuit shown in fig. 4, the connection relationship between the remaining units and devices is shown in fig. 3, and is not described again.
In the embodiment of the invention, the voltage dividing unit is used for dividing the voltage of the high-voltage part, so that the voltage acquired by the control unit is within an acquisition range, and the reliability and accuracy of the acquired data are improved.
For convenience of implementation, in a specific application scenario, the voltage dividing unit may be formed by resistors. It can be understood that, in the voltage dividing unit of the control circuit, only an electric device with a certain resistance value is required to implement the function, and the embodiment of the present invention is not particularly limited thereto.
In a specific implementation process, the voltage dividing unit may be composed of a single resistor, in which case, a first end of the resistor is connected to the first end of the voltage transmitting unit and the second end of the first contact switch unit, and a second end of the resistor is connected to the second end of the voltage transmitting unit and the second end of the second contact switch unit.
When the voltage division function of the voltage division unit is realized by adopting a single resistor, the complexity of the whole control circuit is favorably reduced, and the cost is lower.
It should be noted that the types of resistors involved in the embodiments of the present invention may include, but are not limited to: at least one of a column resistor, a chip resistor, a column resistor array, and a chip resistor array.
And, in another specific implementation, the voltage dividing unit may further be composed of a plurality of resistors connected to each other. In the embodiment of the present invention, the connection method of the plurality of resistors is not particularly limited, and may be a series connection, a parallel connection, or the like.
When the voltage division function of the voltage division unit is realized by the plurality of resistors which are connected with each other, the expandability of the circuit is large, the flexibility is large due to the diversification of the connection modes, and the breakdown of the whole voltage division unit can not be caused even if a single resistor breaks down under a certain connection relation, so that the safety performance of the control circuit can be improved to a certain extent.
Specifically, referring to fig. 5, which is a schematic structural diagram of a fourth embodiment of the control circuit according to the present invention, as shown in fig. 5, a voltage dividing unit 13 in the control circuit includes:
a first resistor 131, a first end of the first resistor 131 being connected to at least one first contact switch unit 11;
a second resistor 132, wherein a first end of the second resistor 132 and a second end of the first resistor 131 are connected to a first end of the cross-over capacitor 155;
a third resistor 133, a first end of the third resistor 133 is connected to the at least one second contact switch unit 12, and a second end of the third resistor 133 and a second end of the second resistor 132 are both connected to a second end of the cross-over capacitor 155.
It is understood that, in the actual implementation of the present solution, the parts in the voltage dividing unit 13 shown in fig. 5 may be adjusted adaptively, including: adding or deleting resistors, etc. For example, a resistor may be added to the position of the first resistor 131 in fig. 5, and in this case, the position of the first resistor 131 connects two resistors; alternatively, for example, the resistance may be deleted at the position of the third resistor 133 in fig. 5, and in this case, the position of the third resistor 133 is not connected to the resistor.
In the embodiment of the invention, in order to further improve the sampling precision, a voltage follower can be connected between the voltage transmission unit and the control unit. Specifically, the control circuit may further include:
the first voltage follower is connected between the voltage transmission unit and the first end of the control unit; and/or the presence of a gas in the gas,
and the second voltage follower is connected between the voltage transmission unit and the second end of the control unit.
In practical implementation of this solution, the voltage follower may be implemented by an amplifier. The voltage follower is used for balancing current, filtering, improving the input impedance of the control unit and improving the sampling precision of the control unit to a certain extent, so that the accuracy of a final high-voltage sampling result is improved, and the accuracy of a final insulation detection result is improved.
At this time, referring to fig. 5, the control circuit shown in fig. 5 further includes:
a first end (input end) of the first voltage follower 171 is connected with a first end of the third switch 153, a second end (output end) is connected with a first end of the control unit 14, a third end (another input end) is connected with a second end (output end), a fourth end is connected with a power supply VDD, and a fifth end is grounded;
a second voltage follower 172, a first end (input end) of the second voltage follower 172 is connected to the first end of the fourth switch 154, a second end (output end) is connected to the second end of the control unit 14, a third end (another input end) is connected to the second end (output end), a fourth end is connected to the power supply VDD, and a fifth end is grounded.
Hereinafter, a control method according to an embodiment of the present invention will be specifically described based on the control circuit shown in fig. 1.
Referring to fig. 6, which is a flowchart illustrating a control method according to an embodiment of the present invention, as shown in fig. 6, the method may include the following steps:
s601, in response to receiving the working instruction, determining a target negative contact and a target positive contact indicated by the working instruction in the contact to be tested.
And S602, acquiring a control time sequence corresponding to the work instruction.
And S603, adjusting the working state of the switch in each switch unit according to the control sequence.
Specifically, the work instruction according to the embodiment of the present invention may include, but is not limited to: a high voltage sampling command or an insulation detection command.
Specifically, the number of the work instructions may be one or more, and therefore, in an actual implementation process, a corresponding relationship between the work instructions and the control timing sequence may be preset in the control unit, so that when any one of the work instructions is received, the control timing sequence may be determined according to the preset corresponding relationship.
To explain the present invention more specifically, the control circuit shown in fig. 5 is taken as an example to specifically explain the working steps of the control circuit provided in the embodiment of the present invention. Hereinafter, the description will be made based on the received operation commands.
First, the work order is a high-pressure sampling order.
Referring to fig. 7 and 8, fig. 7 is an equivalent circuit diagram of the control circuit shown in fig. 5 for implementing high voltage sampling, and fig. 8 is a schematic diagram of a working flow of the control circuit provided in the embodiment of the present invention for implementing high voltage sampling.
Based on the equivalent circuit shown in fig. 7, for convenience of description, taking the voltage between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module as an example, as shown in fig. 8, the work flow may include:
s801, the first contact switch 111-1 and the second contact switch 12-1 are closed.
S802, the first switch 151 and the second switch 152 are closed.
S803, when the voltage across the capacitor 155 is stabilized, the first switch 151 and the second switch 152 are turned off.
In a specific implementation S803, the timing may be started at the time of performing S802, and when the first accumulated time period reaches the first time period t1, the voltage across the capacitor 155 is confirmed to be stable, and then the S803 is performed.
S804, the third switch 153 and the fourth switch 154 are closed.
In a specific implementation S804, for safety, the first switch 151, the second switch 152, the third switch 153, and the fourth switch 154 cannot be closed at the same time, so that the timing may be started at the time of executing S803, and S804 may be executed when the second accumulated time length reaches the second time length t 2.
S805, collecting a first voltage V of a current communicated loop1。
Through the above steps, the control unit 14 acquires the first voltage V1Then, the voltage between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module can be obtained from the resistance values of the resistors in the circuit shown in fig. 7.
Specifically, as shown in FIG. 7, based onVoltage transmission function of the voltage transmission unit 15, first voltage V collected by the control unit 141As for the voltage division of the second resistor 132 in the voltage dividing unit 13, based on that, when the first contact switch 111-1 and the second contact switch 12-1 are closed, the first contact switch unit 111, the voltage dividing unit 13 and the second contact switch unit 12 are connected in series, based on the principle of current equality, the following expression can be obtained:
Figure BDA0001391955670000201
wherein V represents the voltage between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module, and V1Representing a first voltage, R, collected by the control unit132Is the resistance value, R, of the second resistor 132 in the voltage dividing unit 13131Is the resistance value, R, of the first resistor 131 in the voltage dividing unit 13133Is the resistance value, R, of the third resistor 133 in the voltage dividing unit 13111-2Is a resistance value, R, of the first contact resistance 111-2 in the first contact switch unit 11112-2Is the resistance value of the second contact resistance 12-2 in the second contact switching unit 12.
Based on this, the voltage V between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module can be obtained by the above formula.
In practical implementation of this solution, as shown in fig. 7, considering that the cross-over capacitor 155 does not discharge the charge before being used, which may cause the collected first voltage to be different from the voltage of the third resistor 133, before performing S801, the method may further include:
s800a, the third switch 153 and the fourth switch 154 are closed, and the first grounding switch 161 and the second grounding switch 162 are closed.
S800b, collecting the second voltage V of the current communicated loop2。
In this way, the second voltage V can be utilized while the charge across the capacitor 155 is completely discharged2Realize the collected first voltage V1So that the third voltage obtained after the zero calibration and compensation is usedThe above formula is substituted to obtain more accurate voltage V.
It is understood that the method for collecting other contacts to be tested is the same as the method shown in fig. 8, and is not described herein again.
Second, the work order is an insulation detection order.
Referring to fig. 9 and 10, fig. 9 is an equivalent circuit diagram of the control circuit shown in fig. 5 for implementing insulation detection, and fig. 10 is a schematic diagram of a work flow of the control circuit provided in the embodiment of the present invention for implementing insulation detection.
As shown in fig. 9, the control circuit is equivalent to two insulation resistors for the battery module 21: the first end of the first insulation resistor RP is equivalent to a positive contact of the battery module, the first end of the second insulation resistor RN is equivalent to a negative contact of the battery module, and the second end of the first insulation resistor RP and the second end of the second insulation resistor RN are both grounded.
Based on the equivalent circuit shown in fig. 9, as shown in fig. 10, the work flow when performing insulation detection may include:
s1001, the first contact switch 111-1, the first switch 151, the second switch 152, the third switch 153, the fourth switch 154, and the second grounding switch 162-1 are closed.
S1002, collecting a third voltage V of a currently connected loop by using the first end of the control unit 143。
As shown in fig. 9, at this time, the third voltage V is collected3Is the voltage value at the first end (point a) of the voltage dividing unit 13.
At this time, based on the principle that the currents flowing in and out at point a are equal, the following expression can be obtained:
V＝VP1-VN1
wherein, V3Indicating the currently acquired third voltage, VP1Indicating the partial voltage, V, of the first insulation resistance RP in the currently connected loopN1Represents the partial voltage of the second insulation resistance RN in the currently connected loop, V represents the voltage between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module, RPDenotes an insulation resistance value, R, of the first insulation resistor RPNRepresents the insulation resistance value, R, of the second insulation resistance RN132Is the resistance value, R, of the second resistor 132 in the voltage dividing unit 13131Is the resistance value, R, of the first resistor 131 in the voltage dividing unit 13111-2The resistance value of the first contact resistor 111-2 in the first contact switch unit 111,// indicates that the parallel relationship is obtained.
S1003, opening the first contact switch 111-1, the first switch 151, the second switch 152, the third switch 153, the fourth switch 154 and the second grounding switch 162-1.
S1004, the second contact switch 12-1, the first switch 151, the second switch 152, the third switch 153, the fourth switch 154, the first grounding switch 161-1 and the third grounding switch 163-1 are closed.
S1005, collecting the fourth voltage V of the currently connected loop by using the second end of the control unit 144。
At this time, the fourth voltage V is collected as shown in FIG. 94Is the voltage value of the second end (point B) of the voltage dividing unit 13.
At this time, according to kirchhoff's first law, the sum of all currents entering the B node is equal to the sum of all currents leaving the B node, and the following expression can be obtained:
Figure BDA0001391955670000222
V＝VP2-VN2
wherein, V4Indicating the fourth voltage, V, currently acquired163-2Represents the voltage, V, supplied by the constant voltage source 163-2P2Indicating the partial voltage, V, of the first insulation resistance RP in the currently connected loopN2Represents the partial voltage of the second insulation resistance RN in the currently connected loop, V represents the voltage between the positive contact (B +) of the battery module and the negative contact (B-) of the battery module, RPDenotes an insulation resistance value, R, of the first insulation resistor RPNRepresents the insulation resistance value, R, of the second insulation resistance RN132Is the resistance value, R, of the second resistor 132 in the voltage dividing unit 13133Is the resistance value, R, of the third resistor 133 in the voltage dividing unit 1312-2Is the resistance value, R, of the second contact resistor 12-2 in the second contact switch unit 12163-3Indicating the resistance of the constant voltage source divider resistor 163-3.
Then, based on the six formulas obtained above, the equation set is solved, and the first insulation resistance value R of the first insulation resistance RP relative to the vehicle body can be obtainedPAnd a second insulation resistance value R of the second insulation resistance RN relative to the vehicle bodyN。
According to the formula, solving the equation set to obtain a first insulation resistance value R of the battery module relative to the vehicle bodyPCan be expressed as follows:
according to the formula, solving the equation set to obtain a second insulation resistance value R of the battery module relative to the vehicle bodyNCan be expressed as follows:
Figure BDA0001391955670000232
wherein,
Figure BDA0001391955670000234
Figure BDA0001391955670000235
based on the above formula, according to the collected third voltage V3A fourth voltage V4Voltage V of constant voltage source163-2Voltage V between positive and negative electrodes of battery module, and resistance value (R) of each resistor in the control circuit131、R132、R133、R111-2、R12-2) So as to obtain the first insulation resistance R of the battery module relative to the insulation resistance of the vehicle bodyPAnd a second insulation resistance value RN。
Based on the control method, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is used for storing computer instructions, and the computer instructions, when executed, perform the following steps:
acquiring a control time sequence corresponding to the working instruction;
and adjusting the working state of the switch in each switch unit according to the control time sequence.
Specifically, the work instruction according to the embodiment of the present invention may include, but is not limited to: a high voltage sampling command or an insulation detection command.
Based on the control circuit and the control method thereof, the embodiment of the invention also provides a circuit board, a battery management system, a battery system and a vehicle.
Specifically, please refer to fig. 11, which is a schematic structural diagram of a circuit board according to an embodiment of the present invention, as shown in fig. 11, the circuit board includes: the control circuit of any one of the above implementations.
Specifically, please refer to fig. 12, which is a schematic structural diagram of a battery management system according to an embodiment of the present invention, as shown in fig. 12, the battery management system includes: the control circuit of any one of the above implementations.
Specifically, please refer to fig. 13, which is a schematic structural diagram of a battery system according to an embodiment of the present invention, as shown in fig. 13, the battery system includes:
a battery module 1301;
control circuitry 1302 of any of the implementations described above.
Specifically, please refer to fig. 14, which is a schematic structural diagram of a vehicle according to an embodiment of the present invention, as shown in fig. 14, the vehicle includes: such as the battery system shown in fig. 13.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, on one hand, a first contact switch unit in a control circuit is connected with an anode contact, a second contact switch unit is connected with a cathode contact, the first contact switch unit is connected with the second contact switch unit through a voltage division unit, and a voltage signal between a first end and a second end of the voltage division unit can be transmitted to the control unit through the voltage transmission unit, so that the control unit in a low-voltage loop can acquire a voltage value between the first end and the second end of the voltage division unit through the voltage signal transmitted by the voltage transmission unit, and therefore, based on a voltage division principle of the voltage division unit, the voltage value between the anode contact and the cathode contact which are connected at present can be acquired; on the other hand, a first contact switch unit and a second contact switch unit in the control circuit are controlled to be sequentially closed, and a grounding switch unit is controlled to be closed in the process, so that the control unit can acquire voltage values of the first end and the second end of the voltage division unit, and then the insulation resistance value of the battery module can be acquired according to a equation solving mode based on the principle that the inflow current and the outflow current of the end points are consistent; that is to say, compared with the mode of using two independent circuits to realize sampling and detection in the prior art, the technical scheme provided by the embodiment of the invention can realize high-voltage sampling and insulation detection by using one control circuit, thereby greatly simplifying the circuit structure in the battery system, reducing the whole volume of the control circuit, and reducing the circuit cost based on the simplification of the circuit structure, thereby reducing the cost of the whole battery system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (14)

1. A control circuit, the control circuit comprising:
the first end of each first contact switch unit is connected with a positive contact;
at least one second contact switch unit, wherein a first end of each second contact switch unit is connected with a negative contact;
the voltage division unit is connected between the second end of the first contact switch unit and the second end of the second contact switch unit;
a control unit;
the voltage transmission unit is connected with the first end of the voltage division unit, the second end of the voltage division unit, the first end of the control unit and the second end of the control unit; the voltage transmission unit is used for transmitting the voltage between the first end of the voltage division unit and the second end of the voltage division unit to the control unit;
the first end of each grounding switch unit is grounded, the second end of at least one grounding switch unit is connected to the first end of the control unit, and the second end of at least one grounding switch unit is connected to the second end of the control unit.
2. The control circuit of claim 1, wherein the voltage transfer unit comprises:
a first switch, a first end of which is connected with a first end of the voltage dividing unit;
a first end of the second switch is connected with a second end of the voltage division unit;
a third switch, a first end of the third switch being connected with a first end of the control unit;
a fourth switch, a first end of the fourth switch being connected with a second end of the control unit;
and a second end of the first switch and a second end of the third switch are both connected with a first end of the cross-over capacitor, and a second end of the second switch and a second end of the fourth switch are both connected with a second end of the cross-over capacitor.
3. The control circuit of claim 1, wherein each of the ground switch units comprises: a grounding switch;
the first end of the grounding switch is grounded;
the second end of at least one grounding switch is connected between the first end of the control unit and the voltage transmission unit, and the second end of at least one grounding switch is connected between the second end of the control unit and the voltage transmission unit.
4. The control circuit of claim 3, wherein the ground switch unit further comprises:
the first end of the constant voltage source is grounded;
and the constant-voltage source divider resistor is connected between the second end of the constant-voltage source and the first end of the grounding switch.
5. The control circuit according to claim 2, wherein the voltage dividing unit is composed of a single resistor; alternatively, the voltage dividing unit is composed of a plurality of resistors connected to each other.
6. The control circuit of claim 5, wherein the voltage dividing unit comprises:
a first resistor, a first end of which is connected with the at least one first contact switch unit;
a first end of the second resistor and a second end of the first resistor are connected with a first end of the cross-over capacitor;
and a first end of the third resistor is connected with the at least one second contact switch unit, and a second end of the third resistor and a second end of the second resistor are both connected with a second end of the cross-over capacitor.
7. The control circuit according to claim 1, wherein each of the first contact switch units comprises:
a first end of the first contact switch is connected with one positive contact, and a second end of the first contact switch is connected with the voltage dividing unit;
and the first contact resistor is connected between the positive contact and the first end of the first contact switch.
8. The control circuit according to claim 1 or 7, wherein the number of the positive electrode contacts is at least one;
the positive electrode contact includes: at least one of the positive contact of the battery module, the outer side contact of the main positive relay, and the outer side contact of the charging positive relay.
9. The control circuit according to claim 1, wherein each of the second contact switch units comprises:
a first end of the second contact switch is connected with the negative contact, and a second end of the second contact switch is connected with the voltage dividing unit;
and the second contact resistor is connected between the negative contact and the first end of the second contact switch.
10. The control circuit according to claim 1 or 9, wherein the number of the negative electrode contacts is at least one;
the negative contact includes: and a negative contact of the battery module.
11. The control circuit of claim 1, further comprising:
the first voltage follower is connected between the voltage transmission unit and the first end of the control unit; and/or the presence of a gas in the gas,
and the second voltage follower is connected between the voltage transmission unit and the second end of the control unit.
12. The control circuit according to claim 1, wherein each switch in the voltage transfer unit is an optocoupler switch;
the type of each switch in the first contact switch unit is an optical coupling switch;
the types of the switches in the second contact switch unit are all optical coupling switches;
the types of the switches in the grounding switch unit comprise: a switch tube, an opto-coupler switch or a mechanical switch.
13. A battery system, comprising:
a battery module;
a control circuit as claimed in any one of claims 1 to 12.
14. A vehicle, characterized by comprising: the battery system of claim 13.
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