CN116699467A - Battery pack and broken line detection circuit thereof - Google Patents
Battery pack and broken line detection circuit thereof Download PDFInfo
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- CN116699467A CN116699467A CN202310592146.9A CN202310592146A CN116699467A CN 116699467 A CN116699467 A CN 116699467A CN 202310592146 A CN202310592146 A CN 202310592146A CN 116699467 A CN116699467 A CN 116699467A
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims description 42
- 238000007599 discharging Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
-
- 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
- G01R31/54—Testing for continuity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a battery pack and a broken wire detection circuit thereof, wherein the broken wire detection circuit comprises: the device comprises a broken wire detection singlechip, a single-section sampling circuit and a combined sampling circuit; wherein, single festival acquisition circuit includes: the first resistor, the second resistor, the third resistor, a capacitor and a voltage stabilizing tube; one end of the first resistor is electrically connected to the positive electrode of one of the battery cells in the battery cell combination, and the other end of the first resistor is electrically connected to one end of the second resistor; one end of the third resistor is electrically connected to the other end of the second resistor, and the other end of the third resistor is grounded; the capacitor and the voltage stabilizing tube are connected in parallel with the third resistor; the negative pole electric connection of steady voltage tube detects the singlechip to the broken string. The application has the advantages of providing the battery pack and the disconnection detection circuit thereof, which can detect whether the battery cell is disconnected based on the voltage signal.
Description
Technical Field
The application relates to the technical field of battery packs, in particular to a battery pack and a broken wire detection circuit thereof.
Background
Often there are multiple sets of cell combinations in the battery pack, which may be made up of one or more cells. In daily use of the battery pack, the BMS device of the battery pack performs charge and discharge control through the respective semiconductor switches.
Because of the requirement on the performance of the battery pack, the number of the battery cores in the battery core combination in the existing battery pack is increased, and the problem of battery core disconnection caused by reasons such as battery core unwelding and the like is easy to occur due to the processing technology and impact and the like when the later battery pack is used. The BMS scheme of the existing battery pack often performs voltage detection on the whole battery cell assembly, so that the problem of whether the single battery cell is disconnected cannot be effectively detected.
In addition, as the voltage of the battery pack is higher and higher, the semiconductor switches used by the battery pack are more and more, and as the use scene is more and more severe, the semiconductor switches are easy to fail due to breakdown and the like. The existing battery pack does not provide anti-breakdown protection for the semiconductor switch.
Disclosure of Invention
The summary of the application is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary of the application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
Some embodiments of the present application provide a battery pack and a disconnection detecting circuit thereof, which solve the technical problems mentioned in the background section above.
As a first aspect of the present application, some embodiments of the present application provide a disconnection detecting circuit including: the broken wire detection singlechip is used for detecting the received voltage signal; the disconnection detecting circuit further includes: the single-section sampling circuit comprises a diode for electrically connecting the positive electrode of a single battery core in the battery core combination to the broken wire detection singlechip; the combined sampling circuit is used for electrically connecting the positive electrode of the battery cell combination to the broken wire detection singlechip; wherein, the single-section acquisition circuit includes: the first resistor, the second resistor, the third resistor, a capacitor and a voltage stabilizing tube; one end of the first resistor is electrically connected to the positive electrode of one of the battery cells in the battery cell combination, and the other end of the first resistor is electrically connected to one end of the second resistor; one end of the third resistor is electrically connected to the other end of the second resistor, and the other end of the third resistor is grounded; the capacitor and the voltage stabilizing tube are connected in parallel with the third resistor; the negative electrode of the voltage stabilizing tube is electrically connected to the broken wire detection singlechip, and the positive electrode of the voltage stabilizing tube is grounded.
Further, the ratio of the resistance value of the first resistor to the resistance value of the second resistor is in the range of 0.9 to 1.2.
Further, the ratio of the resistance value of the first resistor to the resistance value of the second resistor is 1.
Further, the ratio of the resistance value of the first resistor to the resistance value of the third resistor ranges from 15 to 25.
Further, the ratio of the resistance value of the first resistor to the resistance value of the third resistor is 20.
As a second aspect of the present application, some embodiments of the present application provide a battery pack including: the battery cell combination comprises a plurality of sections of battery cells connected in series; the battery pack further comprises the broken wire detection circuit.
Further, the battery pack further includes: a charge-discharge circuit for charging or discharging; the switch ends of the semiconductor switches are respectively combined with the charging point electric circuit and the electric core to form electric connection; the failure detection singlechip is electrically connected to the control ends of the semiconductor switches to collect voltage signals of the semiconductor switches.
Further, the battery pack further includes: a plurality of shunt resistors, the first ends of which are electrically connected to the control ends of the semiconductor switches; the first ends of the divider resistors are respectively and electrically connected to the second ends of the divider resistors; the first end of the sampling resistor is electrically connected to the first end of the voltage dividing resistor; the second end of the divider resistor is grounded; and the second end of the sampling resistor is electrically connected with the failure detection singlechip.
Further, the battery pack further includes: the first end of the second-class capacitor is electrically connected to the second end of the sampling resistor; the second end of the second-class capacitor is grounded.
Further, the battery pack further includes: the anode of the second diode is electrically connected to the second end of the sampling resistor; and the cathodes of the second-class diodes are electrically connected to the failure detection singlechip.
The application has the beneficial effects that: provided are a battery pack and a disconnection detection circuit thereof, which can detect whether or not disconnection of a battery cell occurs based on a voltage signal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application.
In addition, the same or similar reference numerals denote the same or similar elements throughout the drawings. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.
In the drawings:
fig. 1 is a schematic view of a structure of a battery pack according to an embodiment of the present application;
fig. 2 is a schematic structural view of a battery pack according to another embodiment of the present application;
fig. 3 is a schematic view of a structure of a battery pack according to still another embodiment of the present application.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
The names of messages or information interacted between the various devices in the embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, a battery pack of the present application includes: the battery cell combination and the broken wire detection circuit.
Specifically, the battery cell combination comprises a plurality of battery cells B1, B2 and B3 which are connected in series; they provide a higher voltage output through series connection. Generally, a battery pack has a plurality of parallel cell combinations to provide enough current, and 10 to 20 cells are often connected in series in one cell combination to obtain enough output voltage.
When the specific structure is realized, a group of electric cores can be connected in parallel firstly and then different parallel groups are connected in series, or a group of electric cores can be connected in series and then different electric cores are combined to form parallel connection as shown in figure 1; however, in any connection method, the battery cells need to be connected into the whole through bonding wires or terminals, so that single-battery-cell disconnection is easy to occur due to failure of the bonding wires or the terminals, unbalance among the battery cells can be caused if the battery cells cannot be found out in time, unbalance among the battery cell combinations can be caused, and battery pack faults can be caused after long-term use. The existing battery pack only collects the total voltage of the series group or the parallel group, and as the battery cells are more, the variation of the total voltage caused by the broken line of the battery cells and the voltage variation of the whole group of battery cells caused by charging and discharging are not great, so that the singlechip cannot obtain whether the broken line of the battery cells occurs or not through voltage detection.
As a specific scheme, the disconnection detecting circuit specifically includes: the single-section sampling circuit, the combined sampling circuit and the broken wire detection singlechip.
The single-section sampling circuit is used for collecting the voltage of a single battery cell, the combined sampling circuit is used for collecting the voltage of the whole battery cell combination, and certainly, the battery cell combination in fig. 1 is a series combination, and the technical scheme of the application can be applied to parallel combination formed by a plurality of battery cells. The broken line detection singlechip can use a common voltage detection chip, the chip can detect the voltage at the pin, the voltage detection chip is the same as the voltage detection chip in the prior art, and the running program is a common technology well known to the person skilled in the art, and is not an inventive improvement of the application, and is not repeated here.
As shown in fig. 1, as a specific scheme, the single-section sampling circuit includes: a first resistor R01, a second resistor R02, a third resistor R03, a capacitor C1 and a voltage regulator ZG.
One end of the first resistor R01 is electrically connected to the positive electrode of one of the battery cells in the battery cell combination, and the other end of the first resistor R01 is electrically connected to one end of the second resistor R02; one end of the third resistor R03 is electrically connected to the other end of the second resistor R02, and the other end of the third resistor R03 is grounded; the capacitor C1 and the voltage stabilizing tube ZG are connected in parallel with a third resistor R03; the negative pole electric connection of steady voltage tube ZG is to broken string detection singlechip, and the positive pole ground connection of steady voltage tube ZG. Namely, each single-section sampling circuit is responsible for collecting the positive voltage of each battery cell B1, B2 and B3 to the broken wire detection singlechip.
In a single-section sampling circuit, the first resistor R01 and the second resistor R02 mainly act to divide voltage, so that the voltage input to the broken line detection singlechip is reduced.
Of course, as an alternative, the first resistor R01 and the second resistor R02 may be implemented by using one resistor, which is different in that two resistors may be connected in series according to the use of two resistors with relatively smaller resistance values to obtain a larger voltage division, and in addition, different resistance values may be configured according to the positions of the battery cells in the battery cell combination, so that the voltage relative orders of magnitude at the pins of the acquired disconnection detection singlechip are not greatly different, thereby reducing the requirement of chip selection.
The third resistor R03, the capacitor C1 and the voltage stabilizing tube ZG have the main functions of stabilizing the sampling voltage and avoiding voltage impact at the pin of the broken wire detection singlechip so as to damage the broken wire detection singlechip.
As a specific scheme, the ratio of the resistance value of the first resistor R01 to the resistance value of the second resistor R02 ranges from 0.9 to 1.2. Preferably, the ratio of the resistance value of the first resistor R01 to the resistance value of the second resistor R02 is 1.
As a specific scheme, the ratio of the resistance value of the first resistor R01 to the resistance value of the third resistor R03 ranges from 15 to 25. Preferably, the ratio of the resistance value of the first resistor R01 to the resistance value of the third resistor R03 is 20.
By adopting the resistor matching scheme, the voltage division stability can be ensured, so that the broken wire detection singlechip is protected.
When the resistance value configuration schemes adopted by the single-section sampling circuits are the same, and the battery cores B1, B2 and B3 in the battery core combination are assumed to be balanced in charge and discharge, the voltage value of each battery core B1, B2 and B3 and the total voltage after the addition of the voltage values can be calculated by making a difference between the voltages acquired by the single-chip microcomputer for detecting the disconnection, and the voltage value is defined as the calculated total voltage.
And then the broken line detection singlechip acquires the voltage value of the whole battery cell combination according to the voltage acquired by the combination sampling circuit, and defines the voltage value as the total measured voltage.
If the problem of disconnection of the battery cells B1, B2 and B3 occurs, the difference value between the measured total voltage and the calculated total voltage is always the voltage value of one of the battery cells B1, B2 and B3, and at the moment, the disconnection detection singlechip can judge that the fault of disconnection of the battery cells occurs.
As an extension scheme, the sum of the resistance values of the first resistor and the second resistor of the single-section sampling circuit is defined as a sum resistance value, and the sum resistance value of the single-section sampling circuit corresponding to the low-string battery cell to the high-string battery cell in the battery cell combination is equal to the number of the differential series and is a multiple of the minimum value.
Taking the cell combination shown in fig. 1 as an example, the cell B1 is a low series cell with respect to the cell B2, and the cell B3 is a high series cell with respect to the cell B2. That is, the closer to the ground is the opposite "low string" and the farther from the ground is the opposite "high string". At this time, the sum resistance value of the single-section sampling circuit corresponding to the battery cell B1 is assumed to be a, and the sum resistance value of the single-section sampling circuit corresponding to the battery cell B2 is assumed to be 2A; and the total resistance of the single-section sampling circuit corresponding to the cell B3 is assumed to be 3A. The voltage values of the broken wire detection singlechips (identical in ideal state) are acquired by the battery cores B1, B2 and B3 connected in series in the process of balanced charge and discharge. Therefore, the single chip microcomputer for detecting the broken wire is convenient to judge rapidly directly through the multiple relation, and the calculation program of the single chip microcomputer for detecting the broken wire is simplified relatively.
As further shown in fig. 2, the battery pack of the present application further includes, as an improvement of another aspect of the present application, a further improvement that the battery pack is easy to implement voltage fluctuation due to the battery cell combination caused by a problem such as a battery cell disconnection, thereby disabling the semiconductor switch in the battery pack: the device comprises a charge-discharge circuit, a semiconductor switch and a failure detection singlechip.
The charging and discharging circuit is used for charging or discharging. The specific scheme of the charge-discharge circuit is a common technology well known to those skilled in the art, and is not an inventive improvement of the present application, and is not described herein.
The two switch ends of the semiconductor switch are connected between the charge-discharge circuit and the battery cell combination, and the battery pack can control the on and off of the semiconductor switch by sending a control signal to the control end of the semiconductor switch so as to control whether the battery pack is charged or discharged.
As a specific scheme, the semiconductor switch of the application can be selected from MOS transistors.
The failure detection singlechip may also use a general voltage detection chip, which can detect the voltage at the pin, and the chip is the same as the voltage detection chip in the prior art, and the running program is a general technology well known to those skilled in the art, and is not an inventive improvement of the present application, and is not repeated herein.
As an alternative, the failure detection singlechip and the disconnection detection singlechip of the application can be the same chip. According to the principle of the semiconductor switch, when the semiconductor switch fails, the control terminal is broken down when the control signal is applied to the control terminal, so that the control terminal level is pulled down, and therefore, the semiconductor chip can be informed of whether the semiconductor chip fails or not by collecting the voltage signal.
However, if the voltage signal is directly collected, the failure detection singlechip is affected, and as a specific scheme, as shown in fig. 2, the battery pack of the application further comprises: a shunt resistor R1, a voltage dividing resistor R2, a sampling resistor R3, a class-II capacitor C2 and a class-II diode Z2.
The first end of the shunt resistor R1 is electrically connected to the control end of the semiconductor switch Q1, and the second end of the shunt resistor R1 is electrically connected to the first end of the voltage dividing resistor R2; the second terminal of the voltage dividing resistor R2 is grounded. The first end of the sampling resistor R3 is electrically connected to the first end of the voltage dividing resistor R2; the second end of the sampling resistor R3 is electrically connected to the anode of the second diode Z2. The cathode of the second diode Z2 is electrically connected to the failure detection singlechip. The first end of the second-type capacitor C2 is electrically connected to the second end of the sampling resistor R3, and the second end of the second-type capacitor C2 is grounded.
By such arrangement, the failure detection singlechip is enabled to acquire the voltage signal of the control terminal of the semiconductor switch Q1, thereby judging whether the semiconductor switch Q1 is in a normal operation state effectively.
Specifically, when the semiconductor switch Q1 is normal, the voltage at the control terminal of the semiconductor switch Q1 is about 12V; when the semiconductor switch Q1 fails, the voltage at the control terminal of the semiconductor switch Q1 is pulled down to less than 8V.
The failure detection singlechip can know whether the semiconductor switch Q1 fails or not according to the collected voltage signals. If the charging and discharging operation is not failed, normal charging and discharging operation is continued, and if the charging and discharging operation is failed, system alarming is carried out and normal charging control is stopped.
In a further embodiment of the present application, as shown in fig. 3, the battery pack shown in fig. 3 includes six semiconductor switches Q1 to Q6; they are used to control the charging or discharging of different cell combinations or the whole formed by several cell combinations respectively.
In order to realize the validity detection of the six semiconductor switches Q1 to Q6, six shunt resistors R11 to R16 are arranged in the battery pack and are respectively connected to the control ends of the semiconductor switches Q1 to Q6, and the other ends of the six shunt resistors R11 to R16 are respectively connected to a voltage dividing resistor R2; then the sampling resistor R3, the second-class capacitor C2, the second-class diode Z2 and the failure detection singlechip adopt a connection mode which still adopts the scheme shown in FIG. 2, namely, the first end of the sampling resistor R3 is electrically connected to the first end of the voltage dividing resistor R2; the second end of the sampling resistor R3 is electrically connected to the anode of the second diode Z2. The cathode of the second diode Z2 is electrically connected to the failure detection singlechip. The first end of the second-type capacitor C2 is electrically connected to the second end of the sampling resistor R3, and the second end of the second-type capacitor C2 is grounded.
In the scheme, different resistance values can be respectively configured for the six shunt resistors R11 to R16, so that the failure detection singlechip can judge which semiconductor switch has faults according to the difference of the voltage values obtained by one-time detection. Because the resistance values of the six shunt resistors R11 to R16 are different, when breakdown occurs to the different semiconductor switches, the breakdown is fed back to the switch of the failure detection singlechip
As a further scheme, the battery pack shown in fig. 3 further includes a detection trigger singlechip and a three-class diode Z3. The detection trigger singlechip is electrically connected to the six semiconductor switches Q1 to Q6 through the second-class triode Z3 respectively, so that the detection trigger singlechip can send voltage control signals to the semiconductor switches Q1 to Q6, and voltage signals when the semiconductor switches Q1 to Q6 are normally controlled are simulated. Then, the detection triggering singlechip sends a communication command to the failure detection singlechip, so that the failure detection singlechip starts working, and the failure detection is completed.
The additional detection triggering singlechip has the advantages that in general, the BMS device only sends a control signal to the semiconductor switch to enable the semiconductor switch to be conducted when the battery pack is charged or discharged, but if the semiconductor switch is in a failure state during charging or discharging, potential safety hazards are caused to the whole battery pack, if a main control program of the BMS device is firstly executed for a period of time before each charging or discharging, and then the main program of the BMS device is selected to be continued or terminated according to the result of validity detection, thus definitely causing waste of power consumption of the BMS device, because the main control program of the BMS device is not simply conducted or disconnected, but the on-duty ratio of the semiconductor switch is required to be set according to the voltage and the like of the battery cell unit, so that not only the energy consumption is improved, but also stable validity detection signals cannot be obtained, and false alarm or failure detection occurs. The single-chip microcomputer is triggered by independent detection, so that the situation can be avoided, and meanwhile, the single-chip microcomputer is triggered by the detection triggering to synchronously trigger the broken wire detection single-chip microcomputer to conduct broken wire detection of the battery cell.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the application in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.
Claims (10)
1. The broken wire detection circuit is suitable for detecting whether a single battery cell in a group of battery cell combinations in a battery pack is broken or not;
the disconnection detecting circuit includes:
the broken wire detection singlechip is used for detecting the received voltage signal;
the method is characterized in that:
the disconnection detecting circuit further includes:
the single-section sampling circuit comprises a diode for electrically connecting the positive electrode of a single battery core in the battery core combination to the broken wire detection singlechip;
the combined sampling circuit is used for electrically connecting the positive electrode of the battery cell combination to the broken wire detection singlechip;
wherein, the single-section acquisition circuit includes:
the first resistor, the second resistor, the third resistor, a capacitor and a voltage stabilizing tube;
one end of the first resistor is electrically connected to the positive electrode of one of the battery cells in the battery cell combination, and the other end of the first resistor is electrically connected to one end of the second resistor; one end of the third resistor is electrically connected to the other end of the second resistor, and the other end of the third resistor is grounded; the capacitor and the voltage stabilizing tube are connected in parallel with the third resistor; the negative electrode of the voltage stabilizing tube is electrically connected to the broken wire detection singlechip, and the positive electrode of the voltage stabilizing tube is grounded.
2. The disconnection detection circuit according to claim 1, wherein:
the ratio of the resistance value of the first resistor to the resistance value of the second resistor is in the range of 0.9 to 1.2.
3. The disconnection detection circuit according to claim 2, wherein:
the ratio of the resistance value of the first resistor to the resistance value of the second resistor is 1.
4. A disconnection detection circuit according to any of claims 1 to 3, wherein:
the ratio of the resistance value of the first resistor to the resistance value of the third resistor ranges from 15 to 25.
5. The disconnection detecting circuit according to claim 4, wherein:
the ratio of the resistance value of the first resistor to the resistance value of the third resistor is 20.
6. A battery pack, comprising:
the battery cell combination comprises a plurality of sections of battery cells connected in series;
the method is characterized in that:
the battery pack further includes the disconnection detection circuit of any one of claims 1 to 6.
7. The battery pack according to claim 6, wherein:
the battery pack further includes:
a charge-discharge circuit for charging or discharging;
the switch ends of the semiconductor switches are respectively combined with the charging point electric circuit and the electric core to form electric connection;
the failure detection singlechip is electrically connected to the control ends of the semiconductor switches to collect voltage signals of the semiconductor switches.
8. The battery pack according to claim 7, wherein:
the battery pack further includes:
a plurality of shunt resistors, the first ends of which are electrically connected to the control ends of the semiconductor switches;
the first ends of the divider resistors are respectively and electrically connected to the second ends of the divider resistors;
the first end of the sampling resistor is electrically connected to the first end of the voltage dividing resistor;
the second end of the divider resistor is grounded; and the second end of the sampling resistor is electrically connected with the failure detection singlechip.
9. The battery pack according to claim 1, wherein:
the battery pack further includes:
the first end of the second-class capacitor is electrically connected to the second end of the sampling resistor;
the second end of the second-class capacitor is grounded.
10. The battery pack according to claim 1, wherein:
the battery pack further includes:
the anode of the second diode is electrically connected to the second end of the sampling resistor;
and the cathodes of the second-class diodes are electrically connected to the failure detection singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310592146.9A CN116699467A (en) | 2023-05-24 | 2023-05-24 | Battery pack and broken line detection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310592146.9A CN116699467A (en) | 2023-05-24 | 2023-05-24 | Battery pack and broken line detection circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116699467A true CN116699467A (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310592146.9A Pending CN116699467A (en) | 2023-05-24 | 2023-05-24 | Battery pack and broken line detection circuit thereof |
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| CN (1) | CN116699467A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949842A (en) * | 2024-03-26 | 2024-04-30 | 南京模砾半导体有限责任公司 | Voltage acquisition and disconnection detection method for realizing high-voltage isolation |
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2023
- 2023-05-24 CN CN202310592146.9A patent/CN116699467A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949842A (en) * | 2024-03-26 | 2024-04-30 | 南京模砾半导体有限责任公司 | Voltage acquisition and disconnection detection method for realizing high-voltage isolation |
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