CN211086538U - Battery equalization detection circuit and battery management system - Google Patents
Battery equalization detection circuit and battery management system Download PDFInfo
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- CN211086538U CN211086538U CN201921790903.9U CN201921790903U CN211086538U CN 211086538 U CN211086538 U CN 211086538U CN 201921790903 U CN201921790903 U CN 201921790903U CN 211086538 U CN211086538 U CN 211086538U
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Abstract
A battery equalization detection circuit and a battery management system are connected with a battery, a first control signal is output through an analog-digital sampling circuit to control a switch circuit to be communicated with an equalization loop, and the analog-digital sampling circuit obtains a first voltage according to the voltage of a first input end and the voltage of a second input end; the analog-digital sampling circuit outputs a second control signal to control the switching circuit to switch off the equalizing loop, the first resistor assembly, the fourth resistor assembly and the first capacitor assembly perform common-mode filtering on the voltage of the positive electrode of the battery, the second resistor assembly, the fifth resistor assembly and the second capacitor assembly perform common-mode filtering on the voltage of the negative electrode of the battery, the analog-digital sampling circuit obtains a second voltage according to the voltage of the first input end and the voltage of the second input end, and generates an alarm signal according to the second voltage and the first voltage; the alarm circuit alarms according to the alarm signal; the detection accuracy of the balanced MOS tubular state of the battery is improved, the circuit structure is simplified, and the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of battery management system, especially, relate to a balanced detection circuitry of battery and battery management system.
Background
Currently, with the wide popularization and application of new energy electric vehicles, the demand of Battery Management Systems (BMS) is continuously increasing. At in-process such as daily BMS production test, the equipment production of battery package, loading debugging, if the line sequence mistake of electric core voltage acquisition pencil appears, the short circuit, the condition such as static punctures the balanced MOS pipe of BMS very easily to make electric core voltage gather inaccurate, can not carry out a series of problems such as equilibrium to electric core voltage. However, in the conventional battery management system, the short circuit of the MOS transistor of the BMS external equalization circuit is not directly detected. The breakdown state of an MOS (metal oxide semiconductor) tube in the equalizing circuit is judged according to the difference value of the first cell voltage and the second cell voltage of each cell by detecting the respective first cell voltage and second cell voltage of the N cells under the condition that the equalizing circuit is not started or started, so that the detection of the MOS tube in the battery management system is realized, and the detection precision is low due to the interference of peak voltage; detect BMS outside equalizer circuit MOS pipe through opto-coupler relay, although avoided peak voltage's interference, the circuit is complicated and with high costs.
Therefore, the traditional battery equalization detection circuit cannot improve the detection accuracy of the MOS tube state and simplify the circuit structure at the same time.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a balanced detection circuitry of battery and battery management system aims at solving the unable problem of simplifying circuit structure when improving MOS tubulose state detection accuracy that exists among the traditional technical scheme.
The embodiment of the utility model provides a first aspect provides a battery equalization detection circuit, is connected with the battery, battery equalization detection circuit includes warning circuit, analog-digital sampling circuit, first resistance subassembly, second resistance subassembly, third resistance subassembly, fourth resistance subassembly, fifth resistance subassembly, switch circuit, first electric capacity subassembly and second electric capacity subassembly;
the positive pole of the battery is connected with the first end of the first resistance component, the second end of the first resistance component is connected with the first end of the third resistance component and the first end of the fourth resistance component, the negative pole of the battery is connected with the first end of the second resistance component, the second end of the second resistance component is connected with the first end of the fifth resistance component and the output end of the switch circuit, the second end of the third resistance component is connected with the input end of the switch circuit, the second end of the fourth resistance component is connected with the first end of the first capacitance component and the first input end of the analog-digital sampling circuit, the second end of the fifth resistance component is connected with the first end of the second capacitance component and the second input end of the analog-digital sampling circuit, and the control end of the switch circuit is connected with the first output end of the analog-digital sampling circuit, the alarm circuit is connected with the second output end of the analog-digital sampling circuit;
a first output end of the analog-digital sampling circuit outputs a first control signal, the switch circuit is communicated with a balancing loop according to the first control signal, and the first resistor assembly, the third resistor assembly, the switch circuit and the second resistor assembly balance the battery; the analog-digital sampling circuit obtains a first voltage according to the voltage of a first input end of the analog-digital sampling circuit and the voltage of a second input end of the analog-digital sampling circuit;
the first output end of the analog-digital sampling circuit outputs a second control signal, the switching circuit turns off the equalizing loop according to the second control signal, the first resistor assembly, the fourth resistor assembly and the first capacitor assembly perform common-mode filtering on the positive voltage of the battery, and the second resistor assembly, the fifth resistor assembly and the second capacitor assembly perform common-mode filtering on the negative voltage of the battery; the analog-digital sampling circuit obtains a second voltage according to the voltage of a first input end of the analog-digital sampling circuit and the voltage of a second input end of the analog-digital sampling circuit, generates an alarm signal according to the second voltage and the first voltage, and a second output end of the analog-digital sampling circuit outputs the alarm signal;
and the alarm circuit gives an alarm according to the alarm signal.
In one embodiment, the battery equalization detecting circuit further includes:
the first short-circuit protection component is connected with the positive electrode of the battery and the first resistor component and is used for performing short-circuit protection on the voltage of the positive electrode of the battery;
and the second short-circuit protection component is connected with the negative electrode of the battery and the second resistor component and is used for performing short-circuit protection on the voltage of the negative electrode of the battery.
In one embodiment, the battery equalization detecting circuit further includes:
and the surge protection circuit is connected with the fourth resistor component, the first capacitor component, the fifth resistor component, the second capacitor component and the analog-digital sampling circuit and is used for performing transient high-voltage protection on the common-mode filtered battery positive voltage and the common-mode filtered battery negative voltage.
In one embodiment, the first resistive component comprises: a first resistor and a second resistor;
the first end of the first resistor is connected with the first end of the second resistor, and the second end of the first resistor is connected with the second end of the second resistor;
the first end of the first resistor and the first end of the second resistor together form an input end of the first resistor assembly, and the second end of the first resistor and the second end of the second resistor together form an output end of the first resistor assembly.
In one embodiment, the second resistive component comprises: a fourth resistor and a fifth resistor;
a first end of the fourth resistor is connected with a first end of the fifth resistor, and a second end of the fourth resistor is connected with a second end of the fifth resistor;
a first terminal of the fourth resistor and a first terminal of the fifth resistor together form an input terminal of the second resistor assembly, and a second terminal of the fourth resistor and a second terminal of the fifth resistor together form an output terminal of the second resistor assembly.
In one embodiment, the switching circuit includes: a ninth resistor and a balance MOS tube;
the grid electrode of the equalizing MOS tube is connected with the first end of the ninth resistor;
a second end of the ninth resistor is a control end of the switch circuit; the source electrode of the equalizing MOS tube is the input end of the switch circuit; and the drain electrode of the equalizing MOS tube is the output end of the switch circuit.
In one embodiment, the analog-to-digital sampling circuit includes: an AD analog-to-digital converter;
a first analog output end of the AD analog-to-digital converter is a first input end of the analog-to-digital sampling circuit; a second analog input/output end of the AD analog-to-digital converter is a second input end of the analog-to-digital sampling circuit; a first data input/output end of the AD analog-to-digital converter is an output end of the analog-to-digital sampling circuit; and a second data input/output end of the AD analog-to-digital converter is a second output end of the analog-to-digital sampling circuit.
In one embodiment, the third resistive component comprises: a seventh resistor and an eighth resistor;
a first end of the seventh resistor is connected with a first end of the eighth resistor, and a second end of the seventh resistor is connected with a second end of the eighth resistor;
a first terminal of the seventh resistor and a first terminal of the eighth resistor together form an input terminal of the third resistor assembly, and a second terminal of the seventh resistor and a second terminal of the eighth resistor together form an output terminal of the third resistor assembly.
In one embodiment, the first capacitive assembly comprises: a first capacitor;
the first end of the first capacitor is the input and output end of the first capacitor component, and the second end of the first capacitor is connected with a power ground.
A second aspect of the embodiments provides a battery management system, the battery management system includes the aforesaid balanced detection circuitry of battery.
The utility model discloses balanced detection circuitry of battery includes modulus sampling circuit, alarm circuit, first resistance component, the second resistance component, the third resistance component, the fourth resistance component, the fifth resistance component, switch circuit, first capacitance component and second capacitance component, through balancing and unbalanced control to the battery, and carry out sampling detection and common mode filtering noise reduction to the voltage of battery under the balanced state and not carrying out the balanced state to the battery and handle, thereby realize after the voltage filtering peak voltage interference to the battery, detect the balanced MOS pipe's that switch circuit contains state (for example normal or short circuit or state such as punctureed) again in balanced return circuit, realize accurate, timely detect out the short circuit of balanced MOS pipe or punctureed trouble such as, thereby in time carry out battery management safety control and change, The battery management circuit is maintained, a series of problems that the battery voltage is not accurately collected and the battery voltage cannot be balanced due to the fact that the balanced MOS tube is short-circuited or broken down and the like are avoided, application potential safety hazards of the battery in the battery management system are reduced, and meanwhile the balanced MOS tube detection circuit is simple in structure, timely and accurate in detection, high in reliability and low in cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 without inventive labor.
Fig. 1 is a schematic structural diagram of a battery equalization detection circuit according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a battery equalization detection circuit according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a battery equalization detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram illustrating an example of a battery equalization detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic diagram of a battery equalization detection circuit according to an embodiment of the present invention shows only the relevant parts of the present embodiment for convenience of description, and the details are as follows:
the utility model provides a battery equalization detection circuit, is connected with battery 001, includes analog-digital sampling circuit 010, alarm circuit 09, first resistance subassembly 01, second resistance subassembly 02, third resistance subassembly 03, fourth resistance subassembly 04, fifth resistance subassembly 05, switch circuit 06, first electric capacity subassembly 07 and second electric capacity subassembly 08.
The positive pole of the battery 001 is connected with the first end of the first resistance component 01, the second end of the first resistance component 01 is connected with the first end of the third resistance component 03 and the first end of the fourth resistance component 04, the negative pole of the battery 001 is connected with the first end of the second resistance component 02, the second end of the second resistance component 02 is connected with the first end of the fifth resistance component 05 and the output end of the switch circuit 06, the second end of the third resistance component 03 is connected with the input end of the switch circuit 06, the second end of the fourth resistance component 04 is connected with the first end of the first capacitance component 07 and the first input end of the analog-digital sampling circuit, the second end of the fifth resistance component 05 is connected with the first end of the second capacitance component 08 and the second input end of the analog-digital sampling circuit, the control end of the switch circuit 06 is connected with the first output end of the analog-digital sampling circuit, and the alarm circuit 09 is connected with the second output end of the analog-digital sampling circuit 010.
A first output end of the analog-digital sampling circuit 010 outputs a first control signal, the switch circuit 06 is communicated with the balancing loop according to the first control signal, and the first resistor component 01, the third resistor component 03, the switch circuit 06 and the second resistor component 02 balance the battery 001; the analog-to-digital sampling circuit 010 obtains a first voltage according to a voltage at a first input terminal of the analog-to-digital sampling circuit 010 and a voltage at a second input terminal of the analog-to-digital sampling circuit 010.
A first output end of the analog-digital sampling circuit 010 outputs a second control signal, the switch circuit 06 turns off the equalization loop according to the second control signal, the first resistor component 01, the fourth resistor component 04 and the first capacitor component 07 carry out common-mode filtering on the positive voltage of the battery, and the second resistor component 02, the fifth resistor component 05 and the second capacitor component 08 carry out common-mode filtering on the negative voltage of the battery; the analog-digital sampling circuit 010 obtains a second voltage according to a voltage at a first input end of the analog-digital sampling circuit 010 and a voltage at a second input end of the analog-digital sampling circuit 010, generates an alarm signal according to the second voltage and the first voltage, and a second output end of the analog-digital sampling circuit 010 outputs the alarm signal; the alarm circuit 09 gives an alarm according to the alarm signal.
In specific implementation, when the battery is balanced, the analog-digital sampling circuit 010 generates and outputs a first control signal to control the switch circuit 06 to communicate with the balancing circuit, the battery is balanced through the first resistor component 01, the third resistor component 03, the switch circuit and the second resistor component 02, a first battery anode sampling voltage is output from the second end of the fourth resistor component 04 to the first input end of the analog-digital sampling circuit 010, a first battery cathode sampling voltage is output from the second end of the fifth resistor component 05 to the second input end of the analog-digital sampling circuit 010, and the analog-digital sampling circuit 010 calculates the first voltage according to a voltage (a first battery anode sampling voltage) at the first input end of the analog-digital sampling circuit 010 and a voltage (a first battery cathode sampling voltage) at the second input end of the analog-digital sampling circuit 010.
When the voltage of the battery is sampled and unbalanced, the analog-digital sampling circuit 010 generates and outputs a second control signal to control the switch circuit 06 to turn off the equalization loop, sample the positive voltage of the battery through the first resistor component 01 and the fourth resistor component 04, output a second battery positive electrode sampling voltage from the second end of the fourth resistor component 04 to the first input end of the analog-digital sampling circuit 010, and perform common mode filtering on the positive voltage of the battery through the first resistor component 01, the fourth resistor component 04 and the first capacitor component 07; the battery cathode voltage is sampled through the second resistor component 02 and the fifth resistor component, the second battery cathode sampling voltage is output from the second end of the fifth resistor component 05 to the second input end of the analog-digital sampling circuit 010, and meanwhile, the battery cathode voltage is subjected to common-mode filtering through the second resistor component 02, the fifth resistor component 05 and the second capacitor component; the analog-digital sampling circuit 010 calculates a second voltage according to the second battery anode sampling voltage and the second battery cathode sampling voltage.
Optionally, the analog-digital sampling circuit 010 determines, according to a difference between the first voltage and the second voltage, whether the balancing MOS transistor included in the switching circuit 06 in the balancing loop is short-circuited, broken, or open-circuited, for example, when the balancing MOS transistor included in the switching circuit 06 is short-circuited, broken, or open-circuited, the first voltage and the second voltage are the same and do not change, that is, the second control signal fails to control the switching circuit 06; when the equalizing MOS transistor included in the switching circuit 06 is normal and has no fault, the second voltage is not equal to the first voltage, the difference between the second voltage and the first voltage is greater than a preset value, the optional preset value is 2V, the preset value can be determined by the third resistor component 03, and if the analog-to-digital sampling circuit 010 judges that a fault occurs, an alarm signal is generated to control the alarm circuit to alarm, so that a user is prompted to take safety control measures in time.
By carrying out common-mode filtering processing on the voltage of the battery anode and the voltage of the battery cathode, fault misjudgment and low detection precision caused by interference of peak voltage and common-mode noise can be avoided, and detection is stable and reliable.
The embodiment of the utility model provides a can realize carrying out direct detection to the balanced MOS pipe's of battery state (for example normally or the short circuit perhaps is punctured etc. the state), so that accurate, in time know the short circuit of balanced MOS pipe or by puncturing the trouble, thereby in time carry out battery management safety control and change maintenance battery management circuit, avoid because balanced MOS pipe takes place the short circuit or by the production of a series of problems such as battery voltage collection inaccuracy that breakdown etc. trouble leads to and can not carry out the equilibrium to battery voltage, reduce the application potential safety hazard of battery among the battery management system. Meanwhile, the balanced MOS tube detection circuit is simple in structure, high in detection accuracy and reliability and low in cost.
Referring to fig. 2, in one embodiment, the battery equalization detecting circuit further includes: a first short-circuit protection assembly 011 and a second short-circuit protection assembly 012.
The first short-circuit protection component 011 is connected with the positive electrode of the battery 001 and the first resistance component 01 and is used for performing short-circuit protection on the voltage of the positive electrode of the battery; the second short-circuit protection component 012 is connected to the negative electrode of the battery 001 and the second resistor component 02, and is used for performing short-circuit protection on the voltage of the negative electrode of the battery.
In specific implementation, the first short-circuit protection component 011 and the second short-circuit protection component 012 include at least one of a fuse and a fuse, and are used for performing short-circuit protection and overload protection on the battery, preventing large current from burning circuit components and improving the safety of the circuit.
Referring to fig. 3, in one embodiment, the battery equalization detecting circuit further includes: and a surge protection circuit 013.
The surge protection circuit 013 is connected to the fourth resistor assembly 04, the first capacitor assembly 07, the fifth resistor assembly 05, the second capacitor assembly 08, and the analog-to-digital sampling circuit 010, and is configured to perform transient high-voltage protection on the common-mode filtered battery positive voltage and the common-mode filtered battery negative voltage.
In a specific implementation, the surge protection circuit 013 includes at least one of a TVS transient suppression diode, a discharge tube, a voltage regulator tube, and a varistor. The surge protection circuit 013 can prevent the analog-digital sampling circuit 010 from controlling the switch circuit 06 to open or close the equalization loop instantly and prevent transient high voltage generated instantly when the BMS system is powered on from damaging the circuit components and the chip, protect each component of the circuit from being affected by transient abnormal high voltage, improve the reliability and the practicability of the battery equalization detection circuit, reduce the electricity utilization safety risk and protect the service life of the battery.
Referring to fig. 4, in one embodiment, the first resistor element 01 includes: a first resistor R1 and a second resistor R3.
A first end of the first resistor R1 is connected to a first end of the second resistor R3, and a second end of the first resistor R1 is connected to a second end of the second resistor R3.
A first terminal of the first resistor R1 and a first terminal of the second resistor R3 are commonly configured as an input terminal of the first resistor assembly 01, and a second terminal of the first resistor R1 and a second terminal of the second resistor R3 are commonly configured as an output terminal of the first resistor assembly 01.
Referring to fig. 4, in one embodiment, the second resistor element 02 includes: a fourth resistor R2 and a fifth resistor R4.
A first terminal of the fourth resistor R2 is connected to a first terminal of the fifth resistor R4, and a second terminal of the fourth resistor R2 is connected to a second terminal of the fifth resistor R4.
A first terminal of the fourth resistor R2 and a first terminal of the fifth resistor R4 jointly form an input of the second resistor bank 02, and a second terminal of the fourth resistor R2 and a second terminal of the fifth resistor R4 jointly form an output of the second resistor bank 02.
Referring to fig. 4, in one embodiment, the switch circuit 06 includes: a ninth resistor R7 and a balancing MOS transistor T1.
The gate of the equalizing MOS transistor T1 is connected to the first terminal of the ninth resistor R7. The second terminal of the ninth resistor R7 is the control terminal of the switch circuit 06. The source of the equalizing MOS transistor T1 is the input terminal of the switching circuit 06. The drain of the equalizing MOS transistor T1 is the output terminal of the switching circuit 06.
Referring to fig. 4, in one embodiment, the analog-to-digital sampling circuit 010 includes: and an AD analog-to-digital converter U1.
A first analog output IN1 of the AD analog-to-digital converter U1 is a first input of the analog-to-digital sampling circuit 010. A second analog input/output terminal IN2 of the AD analog-to-digital converter U1 is a second input terminal of the analog-to-digital sampling circuit 010. The first data input/output end D1 of the AD/a/D converter U1 is an output end of the a/D sampling circuit 010. A second data input/output terminal D2 of the AD/a/D converter U1 is a second output terminal of the a/D sampling circuit 010.
Referring to fig. 4, in one embodiment, the third resistance element 03 includes: a seventh resistor R5 and an eighth resistor R6.
The first end of the seventh resistor R5 is connected to the first end of the eighth resistor R6, and the second end of the seventh resistor R5 is connected to the second end of the eighth resistor R6.
A first end of the seventh resistor R5 and a first end of the eighth resistor R6 together form an input terminal of the third resistor assembly 03, and a second end of the seventh resistor R5 and a second end of the eighth resistor R6 together form an output terminal of the third resistor assembly 03.
Referring to fig. 4, in one embodiment, the first capacitor element 07 includes: a first capacitor C1.
A first terminal of the first capacitor C1 is an input/output terminal of the first capacitor assembly 07, and a second terminal of the first capacitor C1 is connected to ground.
In particular, referring to fig. 4, the fourth resistive element 04 includes a third resistor R8. The fifth resistor assembly 05 includes a sixth resistor R9. The second capacitive component 011 comprises a second capacitance C2. One end of a third resistor R8 is connected with the second end of the first resistor R1 and the second end of the second resistor R3, the second end of the third resistor R8 is connected with the first end of the first capacitor C1 and the first input end of the analog-digital sampling circuit 010, and the first resistor R1, the second resistor R3 and the third resistor R8 jointly form a battery positive electrode voltage sampling circuit for sampling the battery positive electrode voltage. One end of a sixth resistor R9 is connected with the second end of the fourth resistor R2 and the second end of the fifth resistor R4, the second end of the sixth resistor R9 is connected with the first end of the second capacitor C2 and the second input end of the analog-digital sampling circuit 010, and the fourth resistor R2, the fifth resistor R4 and the sixth resistor R9 jointly form a battery cathode voltage sampling circuit for sampling the battery cathode voltage.
Referring to fig. 4, in one embodiment, the surge protection circuit 013 includes a zener diode Z1. The voltage regulator tube can further protect the battery equalization detection circuit from being damaged by abnormal high voltage, and the safety, stability and reliability of the battery equalization detection circuit are improved.
In specific implementation, the equalizing MOS transistor T1 is a PMOS transistor, and the PMOS transistor T1 plays a role of equalizing switch. The first short-circuit protection element 011 includes a first fuse FN, and the second short-circuit protection element 012 includes a second fuse FN-1, which perform short-circuit protection and overload protection for the battery BAT. The alarm circuit 09 includes an alarm.
The working principle of the battery equalization detection circuit will be briefly described below with reference to fig. 4:
1. when the battery 001 is balanced, the first data input/output end D1 of the AD analog-to-digital converter U1 outputs a first control signal, which is current-limited by the ninth resistor R7 and then output to the gate of the balancing MOS transistor T1 to control the conduction of the balancing MOS transistor T1, thereby communicating an equalizing loop composed of the first resistor assembly 01 (the first resistor R1 and the second resistor R3), the third resistor assembly 03 (the seventh resistor R5 and the eighth resistor R6), the switch circuit 06 (the ninth resistor R7 and the equalizing MOS transistor T1) and the second resistor assembly 02 (the fourth resistor R2 and the fifth resistor R4), and in a state that the equalizing loop is communicated, the first battery positive electrode sampling voltage is output from the second end of the third resistor R8 to the first analog output end IN1 of the AD analog-to-digital converter U1, and the first battery negative electrode sampling voltage is output from the second end of the sixth resistor R9 to the second analog input-output end IN2 of the AD analog-to-digital converter U1; the AD analog-to-digital converter U1 calculates according to the first battery anode sampling voltage and the first battery cathode sampling voltage to obtain a first voltage; when the battery 001 is not balanced, a second control signal output by a first data input/output end D1 of the AD analog-to-digital converter U1 is limited by a ninth resistor R7 and then output to a gate of the balancing MOS transistor T1 to control the balancing MOS transistor T1 to be turned off, so that the balancing loop is turned off; the positive electrode voltage of the battery 001 is sampled through a first resistor R1, a second resistor R3 and a third resistor R8, the negative electrode voltage of the battery 001 is sampled through a fourth resistor R2, a fifth resistor R4 and a sixth resistor R9, the second battery positive electrode sampling voltage is output from a second end of a third resistor R8 to a first analog output end IN1 of an AD analog-to-digital converter U1, and the second battery negative electrode sampling voltage is output from a second end of a sixth resistor R9 to a second analog input end IN2 of the AD analog-to-digital converter U1; the AD analog-to-digital converter U1 calculates according to the second battery anode sampling voltage and the second battery cathode sampling voltage to obtain a second voltage; the AD analog-to-digital converter U1 determines whether the equalizing MOS transistor T1 has a fault such as a short circuit, an open circuit, or a breakdown according to the first voltage and the second voltage, for example, when the first voltage and the second voltage are the same and do not change, it indicates that the first control signal fails to control the switch circuit 06, that is, it indicates that the equalizing MOS transistor T1 has a fault such as a short circuit, an open circuit, or a breakdown; when the second voltage is not equal to the first voltage and the difference between the second voltage and the first voltage is greater than a preset value, the selectable preset value is 2V, which indicates that the equalizing MOS transistor T1 has no faults such as short circuit, open circuit or breakdown; the AD analog-to-digital converter U1 generates an alarm signal according to the short circuit, the open circuit or the breakdown of the equalizing MOS transistor T1 and outputs the alarm signal from the second data input/output end D2 of the AD analog-to-digital converter U1 to control the alarm to give an alarm.
2. When the balancing MOS transistor T1 is controlled to be communicated with a balancing loop, the ninth resistor R7 also plays a role of a current-limiting resistor; when the equalizing MOS transistor T1 is in a state of conducting an equalizing loop, the first resistor component 01 (the first resistor R1 and the second resistor R3), the second resistor component 02 (the fourth resistor R2 and the fifth resistor R4) and the third resistor component 03 (the seventh resistor R5 and the eighth resistor R6) jointly play a role of equalizing resistance; when the equalizing MOS tube T1 is cut off and an equalizing loop is turned off, the first resistor R1 and the second resistor R3 are connected in parallel and then connected in series with the third resistor R8 to play a role of current-limiting sampling resistor, and meanwhile, the first resistor R1 and the second resistor R3 are connected in parallel to improve the heat dissipation area, and the first resistor R1 and the second resistor R3 are mutually backup, so that the sampling and equalizing circuit is prevented from failing after one current-limiting sampling resistor is damaged; the fourth resistor R2 and the fifth resistor R4 are connected in parallel and then connected in series with the sixth resistor R9 to play a role of current-limiting sampling resistor, meanwhile, the fourth resistor R2 and the fifth resistor R4 are connected in parallel to improve the heat dissipation area, and the fourth resistor R2 and the fifth resistor R4 are mutually backup, so that the sampling and equalizing circuit is prevented from failing after one current-limiting sampling resistor is damaged; the reliability of the battery equalization detection circuit is improved.
3. The common-mode filtering is performed on the positive electrode voltage of the battery through the first resistor R1, the second resistor R3, the third resistor R8 and the first capacitor C1, and the common-mode filtering is performed on the negative electrode voltage of the battery through the fourth resistor R2, the fifth resistor R4, the sixth resistor R9 and the second capacitor C2, so that the interference of common-mode noise is effectively inhibited, the damage of peak voltage to the circuit and the influence on detection are avoided, and the detection accuracy and reliability of the battery equalization detection circuit are improved.
A second aspect of the embodiments of the present invention provides a battery management system, including the above battery equalization detection circuit.
The utility model discloses battery management system can carry out direct detection to the battery voltage among the battery management system and the state of balanced MOS pipe, so that accurate, in time know the short-circuit fault of balanced MOS pipe, thereby in time carry out safety control and change maintenance, avoid because balanced MOS pipe takes place that the battery voltage collection that short-circuit fault leads to is inaccurate and can not carry out the production of a series of problems such as equilibrium to battery voltage, the applied potential safety hazard of battery among the battery management system has been reduced, it is high to detect the accuracy, the circuit structure has been simplified, and the cost is reduced.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A battery equalization detection circuit is connected with a battery and is characterized by comprising an alarm circuit, an analog-digital sampling circuit, a first resistor component, a second resistor component, a third resistor component, a fourth resistor component, a fifth resistor component, a switch circuit, a first capacitor component and a second capacitor component;
the positive pole of the battery is connected with the first end of the first resistance component, the second end of the first resistance component is connected with the first end of the third resistance component and the first end of the fourth resistance component, the negative pole of the battery is connected with the first end of the second resistance component, the second end of the second resistance component is connected with the first end of the fifth resistance component and the output end of the switch circuit, the second end of the third resistance component is connected with the input end of the switch circuit, the second end of the fourth resistance component is connected with the first end of the first capacitance component and the first input end of the analog-digital sampling circuit, the second end of the fifth resistance component is connected with the first end of the second capacitance component and the second input end of the analog-digital sampling circuit, and the control end of the switch circuit is connected with the first output end of the analog-digital sampling circuit, the alarm circuit is connected with the second output end of the analog-digital sampling circuit;
a first output end of the analog-digital sampling circuit outputs a first control signal, the switch circuit is communicated with a balancing loop according to the first control signal, and the first resistor assembly, the third resistor assembly, the switch circuit and the second resistor assembly balance the battery; the analog-digital sampling circuit obtains a first voltage according to the voltage of a first input end of the analog-digital sampling circuit and the voltage of a second input end of the analog-digital sampling circuit;
the first output end of the analog-digital sampling circuit outputs a second control signal, the switching circuit turns off the equalizing loop according to the second control signal, the first resistor assembly, the fourth resistor assembly and the first capacitor assembly perform common-mode filtering on the positive voltage of the battery, and the second resistor assembly, the fifth resistor assembly and the second capacitor assembly perform common-mode filtering on the negative voltage of the battery; the analog-digital sampling circuit obtains a second voltage according to the voltage of a first input end of the analog-digital sampling circuit and the voltage of a second input end of the analog-digital sampling circuit, generates an alarm signal according to the second voltage and the first voltage, and a second output end of the analog-digital sampling circuit outputs the alarm signal;
and the alarm circuit gives an alarm according to the alarm signal.
2. The battery equalization detection circuit as recited in claim 1, wherein said battery equalization detection circuit further comprises:
the first short-circuit protection component is connected with the positive electrode of the battery and the first resistor component and is used for performing short-circuit protection on the voltage of the positive electrode of the battery;
and the second short-circuit protection component is connected with the negative electrode of the battery and the second resistor component and is used for performing short-circuit protection on the voltage of the negative electrode of the battery.
3. The battery equalization detection circuit as recited in claim 1, wherein said battery equalization detection circuit further comprises:
and the surge protection circuit is connected with the fourth resistor component, the first capacitor component, the fifth resistor component, the second capacitor component and the analog-digital sampling circuit and is used for performing transient high-voltage protection on the common-mode filtered battery positive voltage and the common-mode filtered battery negative voltage.
4. The battery equalization detection circuit of claim 1 wherein said first resistive component comprises: a first resistor and a second resistor;
the first end of the first resistor is connected with the first end of the second resistor, and the second end of the first resistor is connected with the second end of the second resistor;
the first end of the first resistor and the first end of the second resistor together form an input end of the first resistor assembly, and the second end of the first resistor and the second end of the second resistor together form an output end of the first resistor assembly.
5. The battery equalization detection circuit of claim 1 wherein said second resistive component comprises: a fourth resistor and a fifth resistor;
a first end of the fourth resistor is connected with a first end of the fifth resistor, and a second end of the fourth resistor is connected with a second end of the fifth resistor;
a first terminal of the fourth resistor and a first terminal of the fifth resistor together form an input terminal of the second resistor assembly, and a second terminal of the fourth resistor and a second terminal of the fifth resistor together form an output terminal of the second resistor assembly.
6. The battery equalization detection circuit of claim 1, wherein the switching circuit comprises: a ninth resistor and a balance MOS tube;
the grid electrode of the equalizing MOS tube is connected with the first end of the ninth resistor;
a second end of the ninth resistor is a control end of the switch circuit; the source electrode of the equalizing MOS tube is the input end of the switch circuit; and the drain electrode of the equalizing MOS tube is the output end of the switch circuit.
7. The battery equalization detection circuit of claim 1, wherein said analog-to-digital sampling circuit comprises: an AD analog-to-digital converter;
a first analog output end of the AD analog-to-digital converter is a first input end of the analog-to-digital sampling circuit; a second analog input/output end of the AD analog-to-digital converter is a second input end of the analog-to-digital sampling circuit; a first data input/output end of the AD analog-to-digital converter is an output end of the analog-to-digital sampling circuit; and a second data input/output end of the AD analog-to-digital converter is a second output end of the analog-to-digital sampling circuit.
8. The battery equalization detection circuit of claim 1 wherein said third resistive component comprises: a seventh resistor and an eighth resistor;
a first end of the seventh resistor is connected with a first end of the eighth resistor, and a second end of the seventh resistor is connected with a second end of the eighth resistor;
a first terminal of the seventh resistor and a first terminal of the eighth resistor together form an input terminal of the third resistor assembly, and a second terminal of the seventh resistor and a second terminal of the eighth resistor together form an output terminal of the third resistor assembly.
9. The battery equalization detection circuit of claim 1 wherein said first capacitive component comprises: a first capacitor;
the first end of the first capacitor is the input and output end of the first capacitor component, and the second end of the first capacitor is connected with a power ground.
10. A battery management system comprising the battery equalization detection circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921790903.9U CN211086538U (en) | 2019-10-23 | 2019-10-23 | Battery equalization detection circuit and battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921790903.9U CN211086538U (en) | 2019-10-23 | 2019-10-23 | Battery equalization detection circuit and battery management system |
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| Publication Number | Publication Date |
|---|---|
| CN211086538U true CN211086538U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921790903.9U Active CN211086538U (en) | 2019-10-23 | 2019-10-23 | Battery equalization detection circuit and battery management system |
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| Country | Link |
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| CN (1) | CN211086538U (en) |
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2019
- 2019-10-23 CN CN201921790903.9U patent/CN211086538U/en active Active
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