CN111505537A - Detection circuit for wiring sequence of lithium ion battery pack - Google Patents
Detection circuit for wiring sequence of lithium ion battery pack Download PDFInfo
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- CN111505537A CN111505537A CN202010335334.XA CN202010335334A CN111505537A CN 111505537 A CN111505537 A CN 111505537A CN 202010335334 A CN202010335334 A CN 202010335334A CN 111505537 A CN111505537 A CN 111505537A
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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
- G01R31/55—Testing for incorrect line connections
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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
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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Abstract
The invention relates to the technical field of circuits, in particular to a detection circuit for a wiring sequence of a lithium ion battery pack, which comprises: a pair of battery voltage input terminals for connecting two poles of battery cells in the battery pack, including a positive input terminal; the window comparison unit is connected with the positive input end through a pair of input ends and used for judging whether the voltage between the positive input ends is within a voltage window range preset by the window comparison unit or not and outputting a corresponding judgment result; the input end of the decoding unit is connected with the output end of the window comparison unit and is used for decoding the judgment result output by the window comparison unit into a corresponding voltage signal; and the input end of the indicating unit is connected with the output end of the decoding unit and used for sending out corresponding indication according to the voltage signal. The technical scheme of the invention has the beneficial effects that: whether the wiring sequence of the battery unit is connected in a wrong way or not can be detected quickly, the complexity of the circuit is reduced, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a detection circuit for a wiring sequence of a lithium ion battery pack.
Background
Lithium ion battery is as a novel energy storage medium, and the application in each field is more and more extensive, especially electric automobile field and energy storage field, because lithium ion battery's voltage is less, consequently needs a plurality of battery monomers to establish ties into the group battery to satisfy the demand of high voltage in the practical application. When the number of strings of a general battery pack is more, the problem of error of a wiring line sequence is difficult to avoid in the wiring process, and further the problem of burning out a simulation front-end chip of each section of the battery pack in the battery management system is possibly caused, so that the whole battery management system is damaged and cannot be used, even potential safety hazards are caused, and the loss is large.
In the prior art, the method for detecting the wiring sequence mainly comprises the steps that an operator observes the battery wiring sequence according to a schematic diagram, or the battery wiring sequence is detected according to a drawing by utilizing the conduction principle of a universal meter, but the method is complex in detection process, needs to consume too much labor and time, and is low in efficiency.
Therefore, the above problems are difficult problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, a circuit for detecting a wiring sequence of a lithium ion battery pack is provided.
The specific technical scheme is as follows:
the invention provides a detection circuit for a wiring sequence of a lithium ion battery pack, which comprises:
a pair of battery voltage input terminals for connecting two poles of battery cells in the battery pack, the pair of battery voltage input terminals including a positive input terminal;
the window comparison unit is connected with the positive input end through a pair of input ends and used for judging whether the voltage of the positive input end is within a voltage window range preset by the window comparison unit or not and outputting a corresponding judgment result;
the input end of the decoding unit is connected with the output end of the window comparison unit and is used for decoding the judgment result output by the window comparison unit into a corresponding voltage signal;
and the input end of the indicating unit is connected with the output end of the decoding unit and used for sending out corresponding indication according to the voltage signal.
Preferably, the window comparing unit includes:
the voltage division circuit is connected between an input voltage and the ground, and is provided with a first voltage division node and a second voltage division node, and the voltage of the first voltage division node is higher than that of the second voltage division node;
the voltage window includes a high threshold voltage and a low threshold voltage, the first voltage division node defines the high threshold voltage, and the second voltage division node defines the low threshold voltage.
Preferably, the window comparing unit further includes:
a first comparator, a positive input terminal of the first comparator being connected to the high threshold voltage, a negative input terminal of the first comparator forming a first input terminal of the window comparison unit;
and the reverse input end of the second comparator is connected with the low threshold voltage, and the forward input end of the second comparator forms the second input end of the window comparison unit.
Preferably, a filter circuit is arranged between the positive input end and the ground.
Preferably, the filter circuit includes a resistor and a capacitor respectively connected in parallel between the positive input end and the ground.
Preferably, a first protection unit is disposed between the pair of battery voltage input terminals and the filter circuit, and the first protection unit includes:
one end of the first resistor is connected with the positive input end, and the other end of the first resistor is connected with a parallel node of the filter circuit close to the positive input end;
and the pair of battery voltage input ends comprises negative input ends, the negative electrode of the first diode is connected with the negative input ends, and the positive electrode of the first diode is connected with the parallel node of the filter circuit close to the ground.
Preferably, the decoding unit is an and gate circuit.
Preferably, the and circuit includes:
the cathode of the second diode is connected with the output end of the first comparator;
the cathode of the third diode is connected with the output end of the second comparator;
one end of the second resistor is connected with the input voltage;
the anode of the second diode and the anode of the third diode are connected in parallel with one end of the second resistor, which faces away from the input voltage, and form the output end of the decoding unit.
Preferably, a second protection unit is disposed between the output end of the decoding unit and the input end of the indication unit, the second protection unit includes a third resistor, and the third resistor is connected in series between the output end of the decoding unit and the input end of the indication unit.
Preferably, the indicating unit is an electroluminescent device.
The technical scheme of the invention has the beneficial effects that: whether the voltage of the positive input end of the pair of battery voltage input ends is in the voltage window range preset by the window comparison unit is judged by the window comparison unit, so that whether the wiring line sequence of the battery unit is connected in a wrong mode or not is quickly detected, the state that the line sequence of the battery pack is connected in a wrong mode can be prompted, a high-precision chip is not needed for realization, the complexity of a circuit is reduced, and the cost is saved.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a functional block diagram of an embodiment of the present invention;
fig. 2 is a circuit diagram of an embodiment of the present invention.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The invention provides a detection circuit for a wiring sequence of a lithium ion battery pack, which comprises:
a pair of battery voltage input ends B + and B-for connecting two poles of a battery unit 1 in the battery pack, the pair of battery voltage input ends including a positive input end B +;
a window comparison unit 2, a pair of input terminals of the window comparison unit 2 is connected with the positive input terminal B + for judging whether the voltage of the positive input terminal B + is within the voltage window range preset by the window comparison unit 2, and outputting the corresponding judgment result;
the input end of the decoding unit 3 is connected with the output end of the window comparing unit 2 and is used for decoding the judgment result output by the window comparing unit 2 into a corresponding voltage signal;
and the input end of the indicating unit 4 is connected with the output end of the decoding unit 3 and used for sending out corresponding indication according to the voltage signal.
With the detection circuit provided as described above, as shown in fig. 1, the pair of input terminals of the window comparison unit 2 are both connected to the positive input terminal B +, the voltage V of the positive input terminal B + is compared with the voltage window preset by the window comparison unit 2, the voltage window may include a preset high threshold voltage VH and a preset low threshold voltage V L, the window comparison unit 2 outputs one judgment result when the voltage V falls within the voltage window defined by the high threshold voltage VH and the low threshold voltage V L, and the window comparison unit 2 outputs the other judgment result when the voltage V is not within the voltage window defined by the high threshold voltage VH and the low threshold voltage V L.
The decoding unit 3 decodes the judgment result and outputs a voltage signal corresponding to the judgment result, and the indicating unit 4 sends out a corresponding indication according to the voltage signal to inform an operator whether the line sequence of the battery unit 1 is connected in a wrong way.
Further, the indication unit 4 may adopt an electroluminescent device, and the electroluminescent device may correspondingly emit light or extinguish according to the voltage signal output by the decoding unit 3 to prompt whether the line sequence of the battery unit 1 is misconnected. Optionally, the indication unit 4 may also use a sound generating device or a graphic display device to indicate whether the line sequence of the battery unit 1 is connected incorrectly.
In a preferred embodiment, the form of the voltage signal output by the decoding unit 3 may be set according to the voltage required by the indicating unit 4 to activate the indicating unit 4. For example, when the indication unit 4 is a digital circuit that is activated by a high level and is deactivated by a low level, the corresponding voltage signal output by the decoding unit 3 can be set to the high level and the low level, and of course, the relationship between the activation and deactivation of the high level and the low level can be switched by providing an inverter circuit (such as a not gate circuit) in the indication unit 4, so that flexible selection can be made while taking into account various factors such as the activation requirement of the indication unit 4 and the cost and complexity of the decoding unit 3. It should be noted that the above-mentioned embodiment that the digital circuit forms the indicating unit 4 and the high-low level as the voltage signal output by the decoding unit 3 is only used to illustrate the feasibility of this embodiment, for example, the decoding unit 3 may also output a corresponding analog voltage signal according to the determination result of the window comparing unit 2, the analog voltage signal may indicate two different determination results through the variation of parameters such as frequency, phase, amplitude, etc., the indicating unit 4 may be provided with an amplifying circuit, and the indication is realized through a load connected in the amplifying circuit, and the load may be a speaker to play sound with different frequencies; or a radio frequency transmitting circuit, which radiates electromagnetic waves into the air through a connected antenna and receives the electromagnetic waves through a receiving device to obtain indication; even the indicating unit 4 may still be a digital circuit, which can be activated by an analog voltage signal only by providing a corresponding analog-to-digital conversion circuit in the indicating unit 4. Therefore, the protection scope of the present application should not be limited by the output form of the decoding unit 3 and the operation form of the indicating unit 4.
In a preferred embodiment, the window comparison unit 2 comprises,
the voltage divider circuit 20 is connected between an input voltage INV and ground GND, the voltage divider circuit 20 has a first voltage dividing node 200 and a second voltage dividing node 201, and the voltage of the first voltage dividing node 200 is higher than that of the second voltage dividing node 201.
The voltage divider circuit 20 is used to define a voltage window of the window comparator 2, wherein the voltage at the first voltage dividing node 200 is the high threshold voltage VH, and the voltage at the second voltage dividing node 201 is the low threshold voltage V L, so that the range of the voltage window can be adjusted by adjusting the voltages at the first voltage dividing node 200 and the second voltage dividing node 201 of the voltage divider circuit 20.
Of course, the voltage window may also be defined by two voltage sources with different voltages already existing in the system, and if there are multiple voltage sources with different voltages already existing in the existing system, two of the voltage sources close to the high threshold voltage VH and the low threshold voltage V L of the required voltage window may be selected and defined by configuring the buck or boost circuit.
Further, the window comparing unit 2 further comprises a first comparator COMP1, a positive input terminal of the first comparator COMP1 is connected to the high threshold voltage VH of the voltage window, and a negative input terminal of the first comparator COMP1 forms a first input terminal of the window comparing unit 2;
a second comparator COMP2, the inverting input terminal of the second comparator COMP2 is connected to the low threshold voltage V L of the voltage window, and the positive input terminal of the second comparator COMP2 forms the second input terminal of the window comparing unit 2.
In the above embodiment, the high threshold voltage VH of the voltage window may be set to be greater than the highest positive voltage of the battery unit 1 (the voltage of the battery at full charge is different from the voltage at non-charge), and the low threshold voltage V L of the voltage window may be set to be less than the lowest positive voltage of the battery unit 1. when the battery unit 1 is connected, the voltage connected to the positive input terminal B + is compared by the window comparator unit 2, if the voltage at the positive input terminal B + is less than the high threshold voltage VH, the first comparator COMP1 outputs a high level, and if the voltage at the positive input terminal B + is greater than the low threshold voltage V L, the second comparator COMP2 also outputs a high level, i.e., when the line sequence connection of the battery unit 1 is correct, the positive of the battery unit 1 is connected to the positive input terminal B +, and as can be known from the foregoing description, the high threshold voltage VH of the voltage window is greater than the highest positive voltage of the battery unit 1, and the low threshold voltage V L is less than the lowest positive voltage of the negative line sequence output of the battery unit 1 when the line sequence connection of the battery unit 1 is correct, the high voltage window is greater than the negative voltage output of the second comparator unit COMP2, and when the high voltage output from the high voltage window COMP2 is greater than the negative voltage output level of the negative voltage output of the second comparator COMP2, the higher voltage window COMP2 is greater than the higher voltage window COMP2, which is greater than the positive output level of the higher voltage window COMP2, which is greater than the positive output when the higher voltage window COMP2, the higher voltage window when the higher voltage window COMP2 is greater than the higher voltage window when the positive output level than the higher voltage window when the positive output level of the positive output window COMP2, the positive output of the positive output.
In a preferred embodiment, the decoding unit 3 may adopt an and circuit, a pair of input terminals of the and circuit are respectively connected to the output terminal of the first comparator COMP1 and the output terminal of the second comparator COMP2, the and circuit outputs a high level when both the first comparator COMP1 and the second comparator COMP2 output a high level, and the and circuit outputs a low level when either one of the first comparator COMP1 and the second comparator COMP2 outputs a low level, so as to form two determination results. As mentioned before, the and gate is not the only implementation of the decoding unit 3.
The present application is further described below with reference to a specific example, which is only for illustrating the feasibility of the present application and should not be construed as limiting the scope of the present application.
Specifically, as shown in fig. 2, the window comparing unit 2 includes a voltage dividing circuit 20, a first comparator COMP1 and a second comparator COMP2, wherein the voltage dividing circuit 20 includes a first voltage dividing node 200 and a second voltage dividing node 201, the voltage of the first voltage dividing node 200 is higher than that of the second voltage dividing node 201, the voltage dividing circuit 20 further includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, the fourth resistor R4 is connected between the first voltage dividing node 200 and the second voltage dividing node 201, the fifth resistor R5 is connected between the second voltage dividing node 201 and ground GND, and the sixth resistor R6 is connected between the first voltage dividing node 200 and the input voltage INV, in this embodiment, the input voltage INV is divided by the voltage dividing circuit 20, so that a high threshold voltage VH is obtained at the first voltage dividing node 200 and a low threshold voltage V L is obtained at the second voltage dividing node 201, and the calculation formula of the low threshold voltage V L is:
VL＝[R5/(R6+R4+R5)]*INV，
wherein V L represents a low threshold voltage value;
r4 represents a fourth resistance value;
r5 represents a fifth resistance value;
r6 represents a sixth resistance value;
INV denotes the input voltage value.
The high threshold voltage VH is calculated as:
VH＝[(R4+R5)/(R6+R4+R5)]*INV，
wherein VH represents a high threshold voltage value;
r4 represents a fourth resistance value;
r5 represents a fifth resistance value;
r6 represents a sixth resistance value;
INV denotes the input voltage value.
In this embodiment, the input voltage INV takes a value of 5V.
Further, the input high threshold voltage VH is compared with the voltage V input by the positive electrode input terminal B + by the first comparator COMP1, the input low threshold voltage V L is compared with the voltage V by the second comparator COMP2, when the voltage V is within a voltage window range determined by the high threshold voltage VH and the low threshold voltage V L, both the first comparator COMP1 and the second comparator COMP2 output a high level, and otherwise, both the first comparator COMP1 and the second comparator COMP2 output a high level and a low level, which has been discussed in the above specific principle and is not described herein again.
In this embodiment, the decoding unit 3 employs an and gate circuit, which includes,
a second diode D2, wherein the cathode of the second diode D2 is connected to the output terminal of the first comparator COMP 1;
a third diode D3, wherein the cathode of the third diode D3 is connected to the output terminal of the second comparator COMP 2;
a second resistor R2, wherein one end of the second resistor R2 is connected to the input voltage INV;
the anode of the second diode D2 and the anode of the third diode D3 are connected in parallel to one end of the second resistor R2 facing away from the input voltage INR and form the output terminal of the decoding unit 3.
The and circuit is composed of a second diode D2, a third diode D3 and a second resistor R2, and is used for decoding the judgment result output by the window comparing unit 2 into a corresponding voltage signal, that is: only when the output end of the first comparator COMP1 and the output end of the second comparator COMP2 are both at a high level, the output end of the and circuit is at a high level; when one or both of the output terminal of the first comparator COMP1 and the output terminal of the second comparator COMP2 are at a low level, the output terminal of the and circuit is at a low level.
In this embodiment, the indicating unit 4 is an L ED indicator light, the L ED indicator light is connected in series between the output end of the and circuit and the ground GND, when the and circuit outputs a high level, the L ED indicator light is turned on to indicate that the line sequence of the battery unit 1 is correct, and when the and circuit outputs a low level, the L ED indicator light is turned off to indicate that the line sequence of the battery unit 1 is incorrect.
In this embodiment, a second protection unit 7 is disposed between the output end of the decoding unit 3 and the input end of the indication unit 4, the second protection unit 7 includes a third resistor R3, and the third resistor R3 is connected in series between the output end of the decoding unit 3 and the input end of the indication unit 4, and plays a role of current limiting protection.
In the present embodiment, a filter circuit 5 is provided between the pair of positive input terminals B + and the ground GND.
Specifically, the filter circuit 5 is arranged between the positive input end B + and the ground GND, the filter circuit 5 comprises a resistor R and a capacitor C which are respectively connected in parallel between the positive input end B + and the ground GND, and interference caused by external voltage fluctuation can be effectively filtered through the filter circuit 5, so that the judgment result of the window comparison unit 2 is more accurate.
In this embodiment, a first protection unit 6 is disposed between the pair of battery voltage input terminals B +, B-and the filter circuit 5, and the first protection unit 6 includes:
one end of a first resistor R1 is connected with the anode input end B +, the other end is connected with the parallel node of the filter circuit 5 close to the anode input end B +, and the first resistor R1 plays a role in current limiting protection;
and a first diode D1, the pair of battery voltage input ends comprises a cathode input end B-, the cathode of the first diode D1 is connected with the cathode input end B-, the anode of the first diode D2 is connected with the parallel node close to the ground of the filter circuit 5, and the first diode D1 plays a role in protection against reverse connection.
The technical scheme of the invention has the beneficial effects that: whether the voltage of the positive input end of the pair of battery voltage input ends is in the voltage window range preset by the window comparison unit is judged by the window comparison unit, so that whether the wiring line sequence of the battery unit is connected in a wrong mode or not is quickly detected, the state that the line sequence of the battery pack is connected in a wrong mode can be prompted, a high-precision chip is not needed for realization, the complexity of a circuit is reduced, and the cost is saved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A detection circuit for a wiring sequence of a lithium ion battery pack is characterized by comprising:
a pair of battery voltage input terminals for connecting two poles of battery cells in the battery pack, the pair of battery voltage input terminals including a positive input terminal;
the window comparison unit is connected with the positive input end through a pair of input ends and used for judging whether the voltage of the positive input end is within a voltage window range preset by the window comparison unit or not and outputting a corresponding judgment result;
the input end of the decoding unit is connected with the output end of the window comparison unit and is used for decoding the judgment result output by the window comparison unit into a corresponding voltage signal;
and the input end of the indicating unit is connected with the output end of the decoding unit and used for sending out corresponding indication according to the voltage signal.
2. The circuit of claim 1, wherein the window comparison unit comprises:
the voltage division circuit is connected between an input voltage and the ground, and is provided with a first voltage division node and a second voltage division node, and the voltage of the first voltage division node is higher than that of the second voltage division node;
the voltage window includes a high threshold voltage and a low threshold voltage, the first voltage division node defines the high threshold voltage, and the second voltage division node defines the low threshold voltage.
3. The circuit of claim 2, wherein the window comparison unit further comprises:
a first comparator, a positive input terminal of the first comparator being connected to the high threshold voltage, a negative input terminal of the first comparator forming a first input terminal of the window comparison unit;
and the reverse input end of the second comparator is connected with the low threshold voltage, and the forward input end of the second comparator forms the second input end of the window comparison unit.
4. The circuit of claim 1, wherein a filter circuit is disposed between the positive input terminal and ground.
5. The circuit of claim 4, wherein the filter circuit comprises a resistor and a capacitor respectively connected in parallel between the positive input terminal and ground.
6. The circuit of claim 5, wherein a first protection unit is disposed between the pair of battery voltage input terminals and the filter circuit, the first protection unit comprising:
one end of the first resistor is connected with the positive input end, and the other end of the first resistor is connected with a parallel node of the filter circuit close to the positive input end;
and the pair of battery voltage input ends comprises negative input ends, the negative electrode of the first diode is connected with the negative input ends, and the positive electrode of the first diode is connected with the parallel node of the filter circuit close to the ground.
7. The circuit of claim 1, wherein the decoding unit is an and circuit.
8. The circuit of claim 7, wherein the AND circuit comprises:
the cathode of the second diode is connected with the output end of the first comparator;
the cathode of the third diode is connected with the output end of the second comparator;
one end of the second resistor is connected with the input voltage;
the anode of the second diode and the anode of the third diode are connected in parallel with one end of the second resistor, which faces away from the input voltage, and form the output end of the decoding unit.
9. The circuit of claim 1, wherein a second protection unit is disposed between the output terminal of the decoding unit and the input terminal of the indication unit, the second protection unit includes a third resistor, and the third resistor is connected in series between the output terminal of the decoding unit and the input terminal of the indication unit.
10. The circuit of claim 1, wherein the indication unit is an electroluminescent device.
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| CN202010335334.XA CN111505537A (en) | 2020-04-24 | 2020-04-24 | Detection circuit for wiring sequence of lithium ion battery pack |
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Application publication date: 20200807 |