CN107167690B - Device and method for detecting broken wire of battery pack voltage acquisition system - Google Patents
Device and method for detecting broken wire of battery pack voltage acquisition system Download PDFInfo
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- CN107167690B CN107167690B CN201710337837.9A CN201710337837A CN107167690B CN 107167690 B CN107167690 B CN 107167690B CN 201710337837 A CN201710337837 A CN 201710337837A CN 107167690 B CN107167690 B CN 107167690B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention provides a broken line detection device of a battery pack voltage acquisition system, which comprises a filtering voltage stabilizing module, a pull-up current source module, a pull-down current source module, a voltage acquisition module and a current acquisition module, wherein the static characteristic of a battery is considered, the actual dynamic working condition of the battery is considered, on one hand, the voltage of a battery monomer is not directly sampled, the pull-up voltage of the sampled battery monomer is taken as a judgment basis, and the broken line of a battery sampling line is detected by adopting a mode of combining the voltage of the battery with the current of a system, so that the circuit design is simplified, and the accuracy of the broken line detection of the sampling line is improved, thereby ensuring the safety of the system. The invention provides a broken line detection method of a battery pack voltage acquisition system.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a broken line detection device and method of a battery pack voltage acquisition system.
Background
With the development of electronic information technology, portable terminals such as mobile phones and notebooks are widely used, and electric vehicles are becoming popular. People are more required to monitor the battery power of the terminal and the battery state of the electric vehicle so as to reasonably manage the power supply energy.
Batteries are increasingly widely applied to various occasions such as electric automobile markets and energy storage markets, and the batteries are just like hearts of the whole system, so that power is provided for the whole system. Therefore, real-time monitoring of battery information is required, and collection of battery voltage is a major parameter in a monitoring system. Once the battery voltage sampling line is disconnected, the system loses the monitoring of the battery, and the battery is overcharged, overdischarged and reduced in consistency due to the wrong battery information, so that serious explosion even occurs, and the personal safety is endangered.
For the disconnection detection of the battery voltage sampling line, several patents have been proposed. For example, CN103825252a proposes a protection device and protection system for a broken battery connection, which presets a broken battery protection voltage, and considers broken battery when the collected battery voltage reaches the preset voltage; as another example, patent CN104391212a proposes a disconnection detecting circuit of a multi-path battery voltage collecting system, if a battery sampling line is disconnected, the battery voltage is pulled down to the ground through a control switch signal, and if the battery voltage read by a microprocessor is 0, it is determined that the line is disconnected; as another example, patent CN106371031a proposes a method and a device for detecting disconnection of a battery pack, in which a collection module collects a voltage of a battery cell, a judgment module judges whether the voltage of the cell is 0, and if the voltage of the battery is 0, the disconnection is judged.
As can be seen from the presently disclosed patent, there are two main methods in the prior art for judging whether to disconnect a wire by using the battery voltage: one is to set a voltage threshold, directly collect the voltage of the battery cell or collect the voltage of the battery cell after the sampling end of the battery is processed by a hardware circuit, and if the voltage reaches the threshold, the line is judged to be broken. The voltage of the battery cell to be judged and the voltages of the front battery cell and the rear battery cell are sampled, and whether the battery voltage sampling line is broken or not is judged according to the voltage change relation between the battery cell and the front battery cell and the rear battery cell. The method takes the directly collected battery cell voltage as a judgment basis for the detection method of the broken line of the battery voltage collection line, the judgment of the solution under the 'static' working condition is more accurate, the influence of voltage fluctuation of the battery under the 'dynamic' working condition and capacitance and the like in a circuit on the voltage is not considered, and the situation of misjudgment frequently occurs in practical application, so that false alarm and protection are caused, and the safe and stable operation of the system is influenced.
Disclosure of Invention
The invention aims to solve the technical problems that: the device and the method for detecting the disconnection of the battery pack voltage acquisition system are provided, the static characteristics of the battery are considered, the actual dynamic working condition of the battery is considered, and the accuracy of the disconnection detection judgment is improved.
The solution of the invention is realized as follows: a battery pack voltage acquisition system disconnection detection device, comprising:
the filtering voltage stabilizing module is connected with the battery cell and is used for filtering out voltage ripples of the battery cell caused by external interference and stabilizing the output voltage of the battery cell;
the pull-up current source module is connected with the battery cell and is used for providing supply current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-up voltage of the battery cell;
the pull-down current source module is connected with the battery cell and is used for providing absorption current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-down voltage of the battery cell;
the voltage acquisition module is used for acquiring the voltage value of each battery cell and providing the voltage value for the disconnection detection module for processing;
the current acquisition module is used for acquiring the current of the battery pack, judging the abnormal working condition of the battery and providing the abnormal working condition for the disconnection detection module for processing.
The other technical scheme of the invention is that on the basis of the above, the filtering voltage stabilizing module consists of a plurality of filtering voltage stabilizing sub-modules, and each filtering voltage stabilizing sub-module is respectively connected with a battery cell.
The other technical scheme of the invention is that the filtering voltage stabilizing sub-module is a filtering voltage stabilizing circuit consisting of a plurality of capacitors and resistors with different parameters.
The other technical scheme of the invention is that on the basis of the above, the pull-up current source module consists of a plurality of sub-pull-up current source modules, each sub-pull-up current source module is respectively connected with a battery cell, and the pull-up current source module provides 100 mu A of supply current to a measurement pin in the process of collecting the voltage of the battery cell, so that the pull-up voltage of the battery cell is collected.
The other technical scheme of the invention is that on the basis of the above, the pull-down current source module consists of a plurality of pull-down current source sub-modules, each pull-down current source sub-module is respectively connected with a battery cell, and the pull-down current source module provides 100 mu A of absorption current to a measurement pin in the process of collecting the voltage of the battery cell, so that the pull-down voltage of the battery cell is collected.
The other technical scheme of the invention is that the voltage acquisition module comprises an AD sampling circuit, an AD correction circuit and a voltage conditioning circuit.
The other technical scheme of the invention is that the current acquisition module comprises a current sensor, a voltage conditioning circuit, an AD sampling circuit and an AD correction circuit.
The other technical scheme of the invention is that the device further comprises a broken wire detection module on the basis of the above, wherein the broken wire detection module is connected with the voltage acquisition module and the current acquisition module.
The other technical scheme of the invention is that the detection method of the broken wire detection module comprises the following steps of:
sampling the total current of the battery pack;
starting a pull-up current source module;
starting a pull-down current source module;
sampling the total current of the battery pack again, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after the sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation is generated, so that misjudgment is easy to generate, and the disconnection detection is abandoned;
if the current change does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1 th battery is considered to be disconnected.
The invention also provides a method for detecting disconnection of the battery pack voltage acquisition system on the basis of the technical scheme, which comprises the following steps:
s1, sampling the total current of the battery pack and recording the total current as current_start;
s2, starting a pull-up current source module, providing 100 mu A of supply current for a sampling port of the voltage of the battery cell, and collecting the pull-up voltage of the battery cell and storing the pull-up voltage into the cellpu (n);
s3, starting a pull-down current source module, providing 100 mu A of absorption current for a sampling port of the voltage of the battery cell, and collecting the pull-down voltage of the battery cell and storing the pull-down voltage in cellpd (n);
s4, sampling the total current of the battery pack again and recording the total current as current_now, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation occurs, so that misjudgment is easy to occur, and the disconnection detection is abandoned;
s5, if the current does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
and S6, if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1-th battery is considered to be disconnected.
From the above technical solutions, the embodiment of the present invention has the following advantages:
in the embodiment provided by the invention, the device and the method for detecting the broken line of the battery pack sampling system are provided, the static characteristic of the battery is considered, the actual dynamic working condition of the battery is considered, on one hand, the voltage of the battery is not directly sampled, the pull-up voltage of the sampled battery is taken as the judgment basis, the broken line of the battery sampling line is detected by adopting the mode of combining the voltage of the battery with the current of the system, the circuit design is simplified, and the accuracy of the broken line detection of the sampling line is improved, so that the safety of the system is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a block diagram of a battery pack voltage acquisition system disconnection detection device according to an embodiment of the present invention;
FIG. 2 is a circuit block diagram of a battery pack voltage acquisition system disconnection detection device according to one embodiment of the invention;
fig. 3 is a flowchart of a method for detecting disconnection of a battery voltage acquisition system according to an embodiment of the present invention.
Detailed Description
The following detailed description of the invention, taken in conjunction with the accompanying drawings, is given by way of illustration and explanation only, and should not be taken as limiting the scope of the invention in any way. Furthermore, the features in the embodiments and in the different embodiments in this document can be combined accordingly by a person skilled in the art from the description of this document.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. On the contrary, the embodiments of the invention include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims. The description of this section is intended to be exemplary and explanatory only and should not be construed as limiting the scope of the invention. Furthermore, the features in the embodiments and in the different embodiments in this document can be combined accordingly by a person skilled in the art from the description of this document. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The embodiment of the invention is as follows, as shown in fig. 1, a broken line detection device of a battery voltage acquisition system, comprising:
the filtering voltage stabilizing module 100 is connected with the battery cell and is used for filtering out voltage ripples of the battery cell caused by external interference and stabilizing the output voltage of the battery cell;
the pull-up current source module 200 is connected with the battery cell and is used for providing supply current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-up voltage of the battery cell;
the pull-down current source module 300 is connected with the battery cell and is used for providing absorption current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-down voltage of the battery cell;
the voltage acquisition module 400 is used for acquiring the voltage value of each battery cell and providing the voltage value for the disconnection detection module for processing;
the current collection module 500 is used for collecting the current of the battery pack, judging the abnormal working condition of the battery and providing the current to the disconnection detection module for processing.
In another embodiment of the present invention, the filtering voltage stabilizing module 100 is composed of a plurality of filtering voltage stabilizing sub-modules, and each filtering voltage stabilizing sub-module is connected with a battery cell respectively.
In another embodiment of the present invention, the filtering voltage stabilizing sub-module is a filtering voltage stabilizing circuit composed of a plurality of capacitors and resistors with different parameters.
In another embodiment of the present invention, the pull-up current source module 200 is composed of a plurality of sub-pull-up current source modules 200, each sub-pull-up current source module 200 is respectively connected with a battery cell, and the pull-up current source module 200 provides a supply current of 100 μa to the measurement pin during the process of collecting the voltage of the battery cell, so as to collect the pull-up voltage of the battery cell.
In another embodiment of the present invention, the pull-down current source module 300 is composed of a plurality of pull-down current source sub-modules, each pull-down current source sub-module is connected with a battery cell, and the pull-down current source module 300 provides 100 μa of sink current to the measurement pin during the process of collecting the voltage of the battery cell, so as to collect the pull-down voltage of the battery cell.
In another embodiment of the present invention, the voltage acquisition module 400 includes an AD sampling circuit, an AD correction circuit, and a voltage conditioning circuit.
In another embodiment of the present invention, the current collecting module 500 includes a current sensor, a voltage conditioning circuit, an AD sampling circuit and an AD correction circuit.
In another embodiment of the present invention, the voltage acquisition module 400 and the current acquisition module 500 are connected to each other by the disconnection detection module 600.
Based on the above embodiment, in another embodiment of the present invention, the processing method of the disconnection detection module 600 includes:
sampling the total current of the battery pack;
turning on the pull-up current source module 200;
turning on the pull-down current source module 300;
sampling the total current of the battery pack again, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after the sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation is generated, so that misjudgment is easy to generate, and the disconnection detection is abandoned;
if the current change does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1 th battery is considered to be disconnected.
As shown in fig. 2, a schematic diagram of a broken wire protection device is taken as an example of application of six series-connected single batteries. It should be noted that, in fig. 2, six series-connected single cells are taken as an example for illustration only, and the number of single cells in the battery pack is not limited in the present invention, and six series-connected single cells are taken as an example for the sake of clarity only.
The filtering voltage stabilizing module 100 is composed of seven sub-filtering voltage stabilizing modules, and is respectively connected with a first battery cathode C0, an anode C1, a second battery cathode C1, an anode C2, a third battery cathode C2, an anode C3, a fourth battery cathode C3, an anode C4, a fifth battery cathode C4, an anode C5, a sixth battery cathode C5 and an anode C6. Each sub-filtering voltage stabilizing module is composed of a first resistor, a first capacitor and a second capacitor, wherein the first resistor is a low-pass filtering resistor, such as the resistor R68-R74 shown in fig. 2, the first capacitor and the second capacitor are low-pass filtering and voltage stabilizing capacitors, the first capacitor is a capacitor C37-C43 shown in fig. 2, and the second capacitor is a capacitor C45, C46, C47, C49, C50 and C51 shown in fig. 2. The stability of the single battery voltage during collection is ensured by the filtering voltage stabilizing module;
the pull-up current source module 200 is composed of seven sub-pull-up current source modules, and is respectively connected with a first battery cathode C0, a positive electrode C1, a second battery cathode C1, a positive electrode C2, a third battery cathode C2, a positive electrode C3, a fourth battery cathode C3, a positive electrode C4, a fifth battery cathode C4, a positive electrode C5, a sixth battery cathode C5 and a positive electrode C6. The pull-up current source module 200 provides a supply current of 100 muA at the collection end of the cell voltage, thereby collecting the pull-up voltage of the cell;
the pull-down current source module 300 is composed of seven sub-pull-down current source modules, and is respectively connected with a first battery cathode C0, an anode C1, a second battery cathode C1, an anode C2, a third battery cathode C2, an anode C3, a fourth battery cathode C3, an anode C4, a fifth battery cathode C4, an anode C5, a sixth battery cathode C5, and an anode C6. The pull-down current source module 300 provides 100 muA of sink current at the collection end of the cell voltage, thereby collecting the pull-down voltage of the cell;
the voltage acquisition module 400 is composed of seven voltage acquisition submodules, and is respectively connected with a first battery cathode C0, an anode C1, a second battery cathode C1 and an anode C2, a third battery cathode C2 and an anode C3, a fourth battery cathode C3 and an anode C4, a fifth battery cathode C4 and an anode C5, and a sixth battery cathode C5 and an anode C6. The voltage acquisition module 400 acquires the pull-up or pull-down voltage values of all the battery monomers, and provides the sampling value for the broken wire detection module for processing;
the current collection module 500 collects the total current of the battery pack formed by the six batteries and provides the sampled value to the disconnection detection module 600 for processing.
The processing method of the disconnection detection module 600, as shown in fig. 3, includes the following steps:
s1, sampling the total current of the battery pack and recording the total current as current_start;
s2, starting a pull-up current source module 200, providing 100 mu A of supply current for a sampling port of the voltage of the battery cell, and collecting the pull-up voltage of the battery cell and storing the pull-up voltage into the cellpu (n);
s3, starting a pull-down current source module 300, providing 100 mu A of absorption current for a sampling port of the voltage of the battery cell, and collecting the pull-down voltage of the battery cell and storing the pull-down voltage in cellpd (n);
s4, sampling the total current of the battery pack again and recording the total current as current_now, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation occurs, so that misjudgment is easy to occur, and the disconnection detection is abandoned;
s5, if the current does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
and S6, if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1-th battery is considered to be disconnected.
From the above technical solutions, the embodiment of the present invention has the following advantages:
in the embodiment provided by the invention, a broken line detection device and a broken line detection method of a battery pack sampling system are provided, wherein a filtering voltage stabilizing module is added before a battery cell voltage sampling port to filter out the voltage fluctuation influence caused by externally connecting high-frequency and low-frequency signals, so that the sampling precision is improved; the static characteristic of the battery is considered, the actual dynamic working condition of the battery is considered, on one hand, the voltage of the battery cell is not directly sampled, but the up-and-down voltage of the sampled battery cell is taken as a judgment basis, a certain current is provided or absorbed for the series battery sampling by adding the up-and-down constant current source module in front of the battery cell voltage sampling port, the up-and-down voltage of the battery cell is taken as a judgment basis, on the other hand, the sampling port is protected, and on the other hand, the recognition of the voltage change is improved; in addition, whether the sampling line is broken or not is judged in a mode of combining the battery voltage and the battery current, so that the broken line detection accuracy under the dynamic working condition of the battery is improved, and the safety of the system is ensured.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The utility model provides a group battery voltage acquisition system broken wire detection device which characterized in that includes:
the filtering voltage stabilizing module is connected with the battery cell and is used for filtering out voltage ripples of the battery cell caused by external interference and stabilizing the output voltage of the battery cell;
the pull-up current source module is connected with the battery cell and is used for providing supply current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-up voltage of the battery cell;
the pull-down current source module is connected with the battery cell and is used for providing absorption current to the measurement pin in the process of collecting the voltage of the battery cell so as to collect the pull-down voltage of the battery cell;
the voltage acquisition module is used for acquiring the voltage value of each battery cell and providing the voltage value for the disconnection detection module for processing;
the current acquisition module is used for acquiring the current of the battery pack, judging the abnormal working condition of the battery and providing the abnormal working condition for the disconnection detection module for processing;
the device also comprises a broken wire detection module, wherein the broken wire detection module is connected with the voltage acquisition module and the current acquisition module; the detection method of the broken wire detection module comprises the following steps:
sampling the total current of the battery pack;
starting a pull-up current source module;
starting a pull-down current source module;
sampling the total current of the battery pack again, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after the sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation is generated, so that misjudgment is easy to generate, and the disconnection detection is abandoned;
if the current change does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1 th battery is considered to be disconnected.
2. The broken line detection device of the battery voltage acquisition system according to claim 1, wherein the filtering voltage stabilizing module is composed of a plurality of filtering voltage stabilizing sub-modules, and each filtering voltage stabilizing sub-module is respectively connected with a battery cell.
3. The battery pack voltage acquisition system disconnection detection device of claim 2, wherein the filtering voltage stabilizing sub-module is a filtering voltage stabilizing circuit composed of capacitors and resistors with a plurality of different parameters.
4. A broken line detection device of a battery voltage acquisition system according to any one of claims 1 to 3, wherein the pull-up current source module is composed of a plurality of sub-pull-up current source modules, each sub-pull-up current source module is respectively connected with a battery cell, and the pull-up current source module provides a supply current of 100 μa to a measurement pin in the process of voltage acquisition of the battery cell, so that the pull-up voltage of the battery cell is acquired.
5. A broken line detection device of a battery voltage acquisition system according to any one of claims 1 to 3, wherein the pull-down current source module is composed of a plurality of pull-down current source sub-modules, each pull-down current source sub-module is respectively connected with a battery cell, and the pull-down current source module provides 100 μa of absorption current to a measurement pin in the process of voltage acquisition of the battery cell, so that the pull-down voltage of the battery cell is acquired.
6. A battery voltage acquisition system disconnection detection device according to any of claims 1 to 3, wherein the voltage acquisition module comprises an AD sampling circuit, an AD correction circuit and a voltage conditioning circuit.
7. A battery voltage acquisition system disconnection detection device according to any of claims 1 to 3, wherein the current acquisition module comprises a current sensor, a voltage conditioning circuit, an AD sampling circuit, and an AD correction circuit.
8. The broken line detection method of the battery voltage acquisition system is characterized by comprising the following steps of:
s1, sampling the total current of the battery pack and recording the total current as current_start;
s2, starting a pull-up current source module, providing 100 mu A of supply current for a sampling port of the voltage of the battery cell, and collecting the pull-up voltage of the battery cell and storing the pull-up voltage into the cellpu (n);
s3, starting a pull-down current source module, providing 100 mu A of absorption current for a sampling port of the voltage of the battery cell, and collecting the pull-down voltage of the battery cell and storing the pull-down voltage in cellpd (n);
s4, sampling the total current of the battery pack again and recording the total current as current_now, judging whether the current change exceeds a set threshold value, if so, considering that the voltage of the battery is before and after sampling, and the battery works under a dynamic working condition, wherein voltage fluctuation occurs, so that misjudgment is easy to occur, and the disconnection detection is abandoned;
s5, if the current does not exceed the set threshold, the battery is considered to be under a relatively static working condition, and the voltage of the battery monomer is stable and can be used for detecting disconnection;
and S6, if the pull-up voltage difference value of the N-th battery cell is smaller than the set voltage threshold value, the sampling line of the N-1-th battery is considered to be disconnected.
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