CN112098739A - Battery package short-circuit protection test circuit, circuit board and test equipment - Google Patents
Battery package short-circuit protection test circuit, circuit board and test equipment Download PDFInfo
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- CN112098739A CN112098739A CN202010464086.9A CN202010464086A CN112098739A CN 112098739 A CN112098739 A CN 112098739A CN 202010464086 A CN202010464086 A CN 202010464086A CN 112098739 A CN112098739 A CN 112098739A
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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Abstract
The embodiment of the invention discloses a battery pack short-circuit protection test circuit, a circuit board and test equipment, wherein the circuit comprises: the short-circuit protection circuit comprises a control chip, a driving circuit, a short-circuit control circuit, a short-circuit delay circuit and a short-circuit starting circuit; the positive end of the short-circuit control circuit is used for connecting the positive electrode of the battery pack, and the negative end of the short-circuit control circuit is used for connecting the negative electrode of the battery pack; the negative end of the short-circuit control circuit is used for being connected with the negative electrode of the battery pack; the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit; when the control chip receives a first short circuit starting signal sent by the first short circuit starting unit or receives a second short circuit starting signal sent by the second short circuit starting unit, the control chip drives the short circuit control circuit through the driving circuit, so that the positive end and the negative end are short-circuited in short circuit time corresponding to the short circuit starting signal. According to the technical scheme, the battery pack is effectively prevented from being damaged by short circuit testing, the testing time is shortened, and the testing difficulty is reduced.
Description
Technical Field
The invention relates to the field of battery pack short circuit testing, in particular to a battery pack short circuit protection testing circuit, a circuit board and testing equipment.
Background
In recent years, with the popularization and use of lithium batteries in household products, the lithium BATTERY industry is promoted to develop more rapidly, and since explosion and fire can occur in the lithium batteries under the conditions of overcharge and short circuit, a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS) must be added to effectively protect the lithium batteries.
The existing short-circuit protection test for the battery management system of the lithium battery comprises a short-circuit test for a small-capacity battery pack and a short-circuit test for a large-capacity battery pack, wherein the short-circuit test for the small-capacity battery pack is artificially and directly short-circuited, and a large-scale instrument is used for the short-circuit protection test for the large-capacity battery pack. A human direct short can have a significant spark and a failure is assumed to directly cause damage to the battery management system and a fire. However, the time of a large instrument cannot be accurate to the time of a level of mu S, mS, the short circuit time of 1S can be set at minimum, the short circuit is disconnected after 1S to realize protection, the price of the large instrument is high, a special laboratory needs to be equipped, and the protection plate can be damaged and fire can be caused by the failure of the protection.
Disclosure of Invention
In view of the above problems, the present invention provides a battery pack short-circuit protection test circuit, a circuit board, and a test apparatus.
One embodiment of the present invention provides a battery pack short-circuit protection test circuit, which includes: the short-circuit protection circuit comprises a control chip, a driving circuit, a short-circuit control circuit, a short-circuit delay circuit and a short-circuit starting circuit;
the positive end of the short-circuit control circuit is used for being connected with the positive electrode of the battery pack, and the negative end of the short-circuit control circuit is used for being connected with the negative electrode of the battery pack;
the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit;
when the control chip receives a first short circuit starting signal sent by the first short circuit starting unit, the control chip drives the short circuit control circuit through the driving circuit, so that the positive end and the negative end are short-circuited in a short circuit time determined according to a short circuit delay signal of the short circuit delay circuit;
when the control chip receives a second short circuit starting signal sent by the second short circuit starting unit, the control chip drives the short circuit control circuit through the driving circuit, so that the positive terminal and the negative terminal are short-circuited within the short circuit time corresponding to the second short circuit starting signal.
The above-mentioned control chip confirms the short-circuit time according to the short-circuit delay signal of short circuit delay circuit, includes:
the short circuit delay circuit comprises delay switches, and the number of the delay switches is a preset number;
each delay switch is used for correspondingly controlling a receiving pin of a short-circuit delay signal of the control chip to be grounded or connected with a power supply end of the control chip;
and the control chip determines the short-circuit time according to the condition that each short-circuit delay signal receiving pin is grounded or connected with a power supply end.
The above-mentioned battery package short-circuit protection test circuit still includes:
the short circuit starting circuit further comprises a third short circuit starting unit;
when the control chip receives a third short circuit starting signal sent by the third short circuit starting unit, the positive end and the negative end of the short circuit control circuit are in short circuit;
and when the third short circuit starting signal disappears, the positive terminal and the negative terminal of the short circuit control circuit are disconnected.
Each short circuit starting unit of the short circuit starting circuit comprises a starting switch;
each starting switch is used for correspondingly controlling a receiving pin of a short circuit starting signal of the control chip to be grounded or connected with a power supply end of the control chip.
The driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first triode, a second triode, a third triode and a diode;
one end of the first resistor is connected with a driving pin of the control chip, the other end of the first resistor is respectively connected with a first end of the first triode and one end of the second resistor, and a third end of the first triode and the other end of the second resistor are grounded;
the second end of the first triode is connected with one end of a third resistor, the other end of the third resistor is respectively connected with a power supply end and the anode of a diode, the cathode of the diode is connected with the second end of the second triode, and the first end of the second triode is connected with the second end of the first triode;
a third end of the second triode is connected with one end of a fourth resistor, the other end of the fourth resistor is connected with a voltage receiving end of the short-circuit control circuit and is connected with one end of a fifth resistor, and the other end of the fifth resistor is connected with a third end of the third triode;
the first end of the third triode is respectively connected with the first end of the second triode and one end of the sixth resistor, and the other end of the sixth resistor and the second end of the third triode are grounded.
The short-circuit control circuit comprises n switching tubes, n protection resistors, k voltage-regulator tubes, a seventh resistor, an eighth resistor and a capacitor, wherein the n protection resistors, the k voltage-regulator tubes, the seventh resistor, the eighth resistor and the capacitor are in one-to-one correspondence with the n switching tubes, and the n and the k are set according to a test condition;
the first end of each switch tube is connected with one end of the corresponding protection resistor, and the other ends of the n protection resistors are connected with each other to serve as the voltage receiving end of the short-circuit control circuit;
the second ends of the n switching tubes, the cathodes of the k voltage-regulator tubes and one end of the capacitor are mutually connected and serve as the positive ends;
the third ends of the n switching tubes are connected with the anodes of the k voltage-regulator tubes and the other ends of the capacitors;
one end of the seventh resistor is connected with a voltage receiving end of the short-circuit control circuit, the other end of the seventh resistor is connected with the third ends of the n switching tubes and serves as the negative end, and the negative end is grounded through an eighth resistor.
The battery pack short-circuit protection test circuit provided by another embodiment of the present invention further includes a voltage conversion circuit and a power supply circuit, wherein a power supply end of the voltage conversion circuit is connected to a power supply end of the power supply circuit, a voltage output end of the voltage conversion circuit is connected to a power supply end of the control chip, the voltage conversion circuit is configured to convert a voltage provided by the power supply circuit into a standard operating voltage of the control chip, and the power supply end is further configured to provide a voltage to the driving circuit.
The battery pack short-circuit protection test circuit further comprises a voltage display circuit and a power supply circuit, wherein a power supply end of the voltage display circuit is connected with a power supply end of the power supply circuit, a positive end of the voltage display circuit is connected with a positive end of the short-circuit control circuit, a negative end of the voltage display circuit is connected with a negative end of the short-circuit control circuit, and the voltage display circuit is used for displaying the size of the short-circuit voltage.
The above embodiments relate to a circuit board including the battery pack short-circuit protection test circuit described in the above embodiments.
The above embodiments relate to a test apparatus including the above circuit board.
The battery pack short-circuit test circuit provided by the invention can set the short-circuit time at the mu S and mS levels, effectively ensures that the short-circuit time set by the short-circuit test circuit is less than the short-circuit protection time of the battery pack, can establish a simple and safe test environment for the battery pack short-circuit test, and avoids the condition that a battery management system is damaged and ignited. And after the control chip acquires a short circuit starting signal, the positive electrode P + end and the negative electrode P-end of the short circuit control circuit are in short circuit, so that the battery pack is protected in short circuit. If the short-circuit protection of the battery pack is invalid, the control chip controls the positive terminal P + and the negative terminal P-of the short-circuit control circuit to be disconnected after the short-circuit time set by the short-circuit delay circuit is exceeded, and therefore personal safety caused by fire and explosion of the battery pack due to continuous short circuit is avoided.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic structural diagram illustrating a short-circuit protection test circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram illustrating a driving circuit and a short-circuit control circuit of a short-circuit protection test circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another short-circuit protection test circuit according to an embodiment of the present invention.
Description of the main element symbols:
10-a control chip; 20-short circuit start-up circuit; 30-short circuit delay circuit; 40-a drive circuit; 50-short circuit control circuit; 60-a voltage conversion circuit; 70-a voltage display circuit; 80-a power supply circuit; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; q1-first triode; q2-second transistor; q3-third transistor; d1-diode; r7 — seventh resistor; r8 — eighth resistance; c1-capacitance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
This embodiment, referring to fig. 1, shows a battery pack short-circuit protection test circuit, which includes: the short-circuit starting circuit comprises a control chip 10, a driving circuit 40, a short-circuit control circuit 50, a short-circuit delay circuit 30 and a short-circuit starting circuit 20.
The positive end of the short-circuit control circuit 50 is used for connecting the positive electrode of the battery pack, and the negative end of the short-circuit control circuit 50 is used for connecting the negative electrode of the battery pack;
the short circuit starting circuit 20 includes a first short circuit starting unit and a second short circuit starting unit; when the control chip 10 receives a first short circuit start signal sent by the first short circuit start unit, the control chip 10 drives the short circuit control circuit 50 through the driving circuit 40, so that the positive terminal and the negative terminal are short-circuited within a short circuit time determined according to the short circuit delay signal of the short circuit delay circuit 30; when the control chip 10 receives a second short circuit start signal sent by the second short circuit start unit, the control chip drives the short circuit control circuit 50 through the driving circuit 40, so that the positive terminal and the negative terminal are short-circuited within a short circuit time corresponding to the second short circuit start signal.
Further, the short-circuit delay circuit 30 includes delay switches, the number of the delay switches is a preset number, each delay switch is used for grounding a receiving pin of a short-circuit delay signal corresponding to the control chip 10 or connecting to a power end of the control chip 10, and the control chip 10 determines the short-circuit time according to the condition that each short-circuit delay signal receiving pin is grounded or connected to the power end.
Exemplarily, if the number of the preset delay switches is 3, which are marked as No. 1, No. 2 and No. 3, and if the receiving pin of the short circuit delay signal controlled by the delay switch correspondingly is grounded, the receiving pin of the short circuit delay signal receives a low level, which can be marked as 0; if the receiving pin of the short circuit delay signal controlled by the delay switch correspondingly is connected with the power end of the control chip 10, the receiving pin of the short circuit delay signal receives a high level, which can be marked as 1. The receiving pins of the three short circuit delay signals of the control chip 10 can determine the short circuit time according to the obtained high level and low level, i.e., whether the pins are 0 or 1. The relationship between the short-circuit time and the short-circuit delay signal corresponding to each delay switch can be seen in the following table.
Further, each short start unit of the short start circuit 20 includes a start switch; each start switch is used for grounding a receiving pin of a short circuit start signal corresponding to the control chip 10 or connecting the receiving pin to a power supply end of the control chip 10.
The short circuit starting circuit 20 may include 3 starting switches, which are denoted as No. 11, No. 22 and No. 33, and the 3 starting switches correspond to the receiving pins of the 3 short circuit starting signals of the control chip 10.
Exemplarily, when a receiving pin of the No. 11 start switch corresponding to a short-circuit start signal of the control chip 10 is connected to a power source terminal of the control chip 10, and when receiving pins of the No. 22 and No. 33 start switches corresponding to the short-circuit start signal of the control chip 10 are grounded, the receiving pin of the short-circuit start signal receives the first short-circuit start signal, and the control chip 10 may determine the short-circuit time according to the short-circuit delay signals corresponding to the respective delay switches. For example, if 3 delay switches connect all 3 pins of the control chip 10 to ground, and all 3 pins receive a low level, which is recorded as 0, the short-circuit time can be determined to be 200 μ S by referring to the relationship table between the short-circuit time and the short-circuit delay signal corresponding to each delay switch. The control chip 10 controls the driving circuit 40 to output a short-circuit voltage when receiving the first short-circuit start signal, and controls the short-circuit control circuit 50 to short-circuit the positive terminal and the negative terminal of the short-circuit control circuit 50 when receiving the short-circuit voltage, so that the battery pack is disconnected after performing a short circuit of 200 mus.
Exemplarily, when the other short circuit starting signal receiving pin of the No. 22 starting switch corresponding to the control chip 10 is connected to the power supply terminal of the control chip 10, and the receiving pins of the No. 11 and No. 33 starting switches corresponding to the short circuit starting signal of the control chip 10 are grounded, the second short circuit starting signal is received by the receiving pin of the short circuit starting signal, and the control chip 10 determines the short circuit time according to the preset time. For example, if the preset time is 30S, the control chip 10 controls the driving circuit 40 to output a short-circuit voltage when receiving the second short-circuit start signal, and controls the short-circuit control circuit 50 to short-circuit the positive terminal and the negative terminal of the short-circuit control circuit 50 when receiving the short-circuit voltage, so that the battery pack is disconnected after performing a short-circuit for 30S.
Exemplarily, when a receiving pin of the No. 33 start switch corresponding to a short-circuit start signal of the control chip 10 is connected to a power supply terminal of the control chip 10, and receiving pins of the No. 11 and No. 22 start switches corresponding to the short-circuit start signal of the control chip 10 are grounded, the receiving pin of the short-circuit start signal receives a third short-circuit start signal, and controls the positive terminal and the negative terminal of the short-circuit control circuit 50 to be in short circuit; when the third short circuit start signal disappears, that is, the No. 33 start switch is grounded corresponding to the receiving pin of the short circuit start signal of the control chip 10, the positive terminal and the negative terminal of the short circuit control circuit 50 are disconnected.
Further, referring to fig. 2, the driving circuit 40 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first transistor Q1, a second transistor Q2, a third transistor Q3, and a diode D1.
One end of the first resistor R1 is connected to a driving pin of the control chip 10, the other end of the first resistor R1 is connected to the first end of the first triode Q1 and one end of the second resistor R2, respectively, and the third end of the first triode Q1 and the other end of the second resistor R2 are grounded; the second end of the first triode Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with the power supply end and the anode of a diode D1, the cathode of the diode D1 is connected with the second end of a second triode Q2, and the first end of a second triode Q2 is connected with the second end of the first triode Q1; a third end of the second triode Q2 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with a voltage receiving end of the short-circuit control circuit 50 and is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected with a third end of a third triode Q3; a first end of the third transistor Q3 is connected to a first end of the second transistor Q2 and one end of the sixth resistor R6, respectively, and the other end of the sixth resistor R6 and a second end of the third transistor Q3 are grounded.
The driving circuit 40 adopts a push-pull driving circuit 40 in a vertical tube pair mode, which is different from a common push-pull circuit, and the output voltage of the common push-pull circuit is clamped to a single chip VCC (5V) -0.7V at high level, so that the voltage of a driving MOS becomes smaller and the internal resistance becomes larger. The output voltage of the driving circuit 40 may be B16V.
B16V is the positive pole P + (12V-16.8V) of a 4-string 1-parallel battery pack, and the battery pack is provided with a protection circuit board protection battery cell. When the driving pin of the control chip 10 outputs a low level, the voltage B16V received by the driving circuit 40 is transmitted to the second transistor Q2 and the third transistor Q3 through the third resistor R3, the third transistor Q3 is turned off, the second transistor Q2 is turned on, and the short-circuit voltage output terminal outputs a short-circuit voltage. When the driving pin of the control chip 10 outputs a high level, the first transistor Q1 is turned on, the voltage of the B16V is pulled to ground by the first transistor Q1 after passing through the third resistor R3 to the second transistor Q2 and the third transistor Q3, the second transistor Q2 is turned off, the third transistor Q3 is turned on, and the short-circuit voltage output terminal is pulled to ground to output a low level.
Further, referring to fig. 2, the short circuit control circuit 50 includes n switching tubes, n protection resistors corresponding to the n switching tubes one by one, k voltage regulator tubes, a seventh resistor R7, an eighth resistor R8, and a capacitor C1, where n and k are set according to a test condition.
The first end of each switch tube is connected with one end of the corresponding protection resistor, and the other ends of the n protection resistors are connected with each other to be used as the voltage receiving end of the short-circuit control circuit 50; the second ends of the n switching tubes, the cathodes of the k voltage-regulator tubes and one end of a capacitor C1 are connected with each other and used as positive terminals; the third ends of the n switching tubes are connected with the anodes of the k voltage-regulator tubes and the other end of the capacitor C1; one end of the seventh resistor R7 is connected to the voltage receiving end of the short-circuit control circuit 50, the other end of the seventh resistor R7 is connected to the third ends of the n switching tubes and serves as a negative end, and the negative end is grounded through the eighth resistor R8.
When the control chip 10 receives the short circuit starting signal, the control chip 10 controls the driving circuit 40 to output a short circuit voltage, namely, a B16V voltage (12V-16.8V), n switching tubes are switched on, and a positive electrode end P + and a negative electrode end P-of the short circuit control circuit 50 are in short circuit, when the short circuit time is reached, the short circuit voltage end output by the driving circuit 40 is pulled to the ground, the n switching tubes are switched off, the positive electrode end P + and the negative electrode end P-of the short circuit control circuit 50 are switched off, and the peak voltage generated at the moment of switching-off is absorbed by k voltage-stabilizing tubes. The n switching tubes select the switching tubes with high voltage resistance and low internal resistance.
Exemplarily, n may be 10, and the internal resistance of the combined 10 switching tubes is very small and can be ignored for the whole short circuit control circuit 50. Because the switch tube can generate large peak voltage at the moment of turning off, the peak energy is larger when the current is larger, and the high voltage of the battery is superposed, the transient peak exceeds the withstand voltage value of the switch tube to damage the switch tube, so that a voltage stabilizing tube is required to be added to absorb the peak voltage, and k can be 15. The n and k can be set according to the test requirement.
The short-circuit test circuit for the battery pack can set the short-circuit time at the mu S and mS levels, effectively ensures that the short-circuit time set by the short-circuit test circuit is less than the short-circuit protection time of the battery pack, can establish a simple and safe test environment for the short-circuit test of the battery pack, and avoids the damage and fire of a battery management system. The positive pole P + and the negative pole P-of the battery pack are connected into a short-circuit protection test circuit, the short-circuit time delay circuit 30 needs to be longer than the short-circuit time designed by the battery management system according to the short-circuit time designed by the battery management system, and after the control chip 10 obtains a short-circuit starting signal, the positive pole P + end and the negative pole P-of the short-circuit control circuit 50 are in short circuit, so that the battery pack is in short-circuit protection. If the short-circuit protection of the battery pack fails, the control chip 10 controls the positive terminal P + and the negative terminal P-of the short-circuit control circuit 50 to be disconnected after the short-circuit time set by the short-circuit delay circuit 30 is exceeded, so that the personal safety caused by the fire and explosion of the battery pack due to continuous short circuit is avoided.
Example 2
In this embodiment, referring to fig. 3, the illustrated battery pack short-circuit protection test circuit further includes a voltage conversion circuit 60 and a power supply circuit 80, a power supply terminal of the voltage conversion circuit 60 is connected to a power supply terminal of the power supply circuit 80, a voltage output terminal of the voltage conversion circuit 60 is connected to a power supply terminal of the control chip 10, the voltage conversion circuit 60 is configured to convert the voltage provided by the power supply circuit 80 into a standard operating voltage of the control chip 10, and the power supply terminal is further configured to provide a voltage to the driving circuit.
Further, the battery pack short-circuit protection test circuit further comprises a voltage display circuit 70 and a power supply circuit 80, wherein a power supply end of the voltage display circuit 70 is connected with a power supply end of the power supply circuit 80, a positive end of the voltage display circuit 70 is connected with a positive end of the short-circuit control circuit 50, a negative end of the voltage display circuit 70 is connected with a negative end of the short-circuit control circuit 50, and the voltage display circuit 70 is used for displaying the magnitude of the short-circuit voltage.
The voltage display circuit 70 includes a voltage display screen, and whether the short-circuit protection is effective can be determined by observing the voltage display screen. For example, if the voltage display screen displays the battery voltage, the short circuit protection of the battery pack is disabled; and if the voltage display screen displays a small voltage, the short-circuit protection of the battery pack is normal.
It should be understood that the above embodiments relate to a circuit board including the battery pack short-circuit protection test circuit of the above embodiments.
It will be appreciated that the above embodiments relate to a test apparatus comprising a circuit board as described above.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A battery pack short circuit protection test circuit, the circuit comprising: the short-circuit protection circuit comprises a control chip, a driving circuit, a short-circuit control circuit, a short-circuit delay circuit and a short-circuit starting circuit;
the positive end of the short-circuit control circuit is used for being connected with the positive electrode of the battery pack, and the negative end of the short-circuit control circuit is used for being connected with the negative electrode of the battery pack;
the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit;
when the control chip receives a first short circuit starting signal sent by the first short circuit starting unit, the control chip drives the short circuit control circuit through the driving circuit, so that the positive end and the negative end are short-circuited in a short circuit time determined according to a short circuit delay signal of the short circuit delay circuit;
when the control chip receives a second short circuit starting signal sent by the second short circuit starting unit, the control chip drives the short circuit control circuit through the driving circuit, so that the positive terminal and the negative terminal are short-circuited within the short circuit time corresponding to the second short circuit starting signal.
2. The battery pack short-circuit protection test circuit of claim 1, wherein the control chip determines the short-circuit time according to the short-circuit delay signal of the short-circuit delay circuit, and the short-circuit time comprises:
the short circuit delay circuit comprises delay switches, and the number of the delay switches is a preset number;
each delay switch is used for correspondingly controlling a receiving pin of a short-circuit delay signal of the control chip to be grounded or connected with a power supply end of the control chip;
and the control chip determines the short-circuit time according to the condition that each short-circuit delay signal receiving pin is grounded or connected with a power supply end.
3. The battery pack short-circuit protection test circuit of claim 1, further comprising:
the short circuit starting circuit further comprises a third short circuit starting unit;
when the control chip receives a third short circuit starting signal sent by the third short circuit starting unit, the positive end and the negative end of the short circuit control circuit are in short circuit;
and when the third short circuit starting signal disappears, the positive terminal and the negative terminal of the short circuit control circuit are disconnected.
4. The battery pack short-circuit protection test circuit of claim 3, wherein each short-circuit start unit of the short-circuit start circuit comprises a start switch;
each starting switch is used for correspondingly controlling a receiving pin of a short circuit starting signal of the control chip to be grounded or connected with a power supply end of the control chip.
5. The battery pack short-circuit protection test circuit of claim 1, wherein the driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first triode, a second triode, a third triode, and a diode;
one end of the first resistor is connected with a driving pin of the control chip, the other end of the first resistor is respectively connected with a first end of the first triode and one end of the second resistor, and a third end of the first triode and the other end of the second resistor are grounded;
the second end of the first triode is connected with one end of a third resistor, the other end of the third resistor is respectively connected with a power supply end and the anode of a diode, the cathode of the diode is connected with the second end of the second triode, and the first end of the second triode is connected with the second end of the first triode;
a third end of the second triode is connected with one end of a fourth resistor, the other end of the fourth resistor is connected with a voltage receiving end of the short-circuit control circuit and is connected with one end of a fifth resistor, and the other end of the fifth resistor is connected with a third end of the third triode;
the first end of the third triode is respectively connected with the first end of the second triode and one end of the sixth resistor, and the other end of the sixth resistor and the second end of the third triode are grounded.
6. The battery pack short-circuit protection test circuit according to claim 1, wherein the short-circuit control circuit comprises n switching tubes, and n protection resistors, k voltage regulator tubes, a seventh resistor, an eighth resistor and a capacitor which are in one-to-one correspondence with the n switching tubes, wherein n and k are set according to a test condition;
the first end of each switch tube is connected with one end of the corresponding protection resistor, and the other ends of the n protection resistors are connected with each other to serve as the voltage receiving end of the short-circuit control circuit;
the second ends of the n switching tubes, the cathodes of the k voltage-regulator tubes and one end of the capacitor are mutually connected and serve as the positive ends;
the third ends of the n switching tubes are connected with the anodes of the k voltage-regulator tubes and the other ends of the capacitors;
one end of the seventh resistor is connected with a voltage receiving end of the short-circuit control circuit, the other end of the seventh resistor is connected with the third ends of the n switching tubes and serves as the negative end, and the negative end is grounded through an eighth resistor.
7. The battery pack short-circuit protection test circuit according to any one of claims 1-6, further comprising a voltage conversion circuit and a power supply circuit, wherein a power supply terminal of the voltage conversion circuit is connected to a power supply terminal of the power supply circuit, a voltage output terminal of the voltage conversion circuit is connected to a power supply terminal of the control chip, the voltage conversion circuit is configured to convert a voltage provided by the power supply circuit into a standard operating voltage of the control chip, and the power supply terminal is further configured to provide a voltage to the driving circuit.
8. The battery pack short-circuit protection test circuit according to any one of claims 1 to 6, further comprising a voltage display circuit and a power supply circuit, wherein a power supply end of the voltage display circuit is connected to a power supply end of the power supply circuit, a positive end of the voltage display circuit is connected to a positive end of the short-circuit control circuit, a negative end of the voltage display circuit is connected to a negative end of the short-circuit control circuit, and the voltage display circuit is used for displaying the magnitude of the short-circuit voltage.
9. A circuit board comprising the battery pack short-circuit protection test circuit of any one of claims 1 to 8.
10. A test device characterized in that it comprises a circuit board according to claim 9.
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