CN111123168A - Fault detection circuit of battery pack connecting line - Google Patents
Fault detection circuit of battery pack connecting line Download PDFInfo
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- CN111123168A CN111123168A CN201911413130.7A CN201911413130A CN111123168A CN 111123168 A CN111123168 A CN 111123168A CN 201911413130 A CN201911413130 A CN 201911413130A CN 111123168 A CN111123168 A CN 111123168A
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Abstract
The invention discloses a fault detection circuit of a battery pack connecting line, which can ensure that a light-emitting diode in a corresponding detection circuit cannot be lightened under the abnormal conditions of wrong connection, missing connection and the like of the battery connecting line of a battery pack by arranging a divider resistor in the detection circuit corresponding to an even number battery or an odd number battery, and can accurately detect the fault condition of the connecting line of the battery pack. And a voltage-resistant diode is connected in series between the light-emitting diode and the cathode of the battery or a diode is connected in parallel at two ends of the light-emitting diode in a reverse direction, so that the light-emitting diode cannot be broken down and damaged under the condition that any connecting wire is connected in a wrong way.
Description
Technical Field
The invention relates to the field of battery management, in particular to a fault detection circuit of a battery pack connecting line.
Background
The battery capacity and voltage needed in a large energy storage system are both large, multiple single batteries are often needed to be connected in series to form a battery pack to be used for improving the voltage, multiple batteries are connected in parallel to form the battery pack to be used for improving the capacity, the multiple batteries are needed to be connected in parallel to form the battery pack to be used for improving the capacity, the single voltage is especially important in the electrical parameters because the number of the batteries needing to be connected in series/parallel is large, the whole battery pack is charged and discharged together for safety and reliability, the current of each battery cell is the same, as the difference exists among the single batteries, the single battery cells are charged firstly and discharged firstly, and as long as one battery cell is charged, the whole battery pack is stopped to be charged, as long as one battery is discharged, the entire battery pack must stop discharging. Therefore, the BMS must monitor each cell in real time, i.e., connection lines are required between the BMS and each cell, and there are many battery connection harnesses, as shown in fig. 1.
The battery pack needs manual participation in the installation process, a plurality of assembly problems such as battery misassembly, wiring harness node misconnection, wiring harness missing and the like are difficult to avoid in the middle, and particularly in occasions such as maintenance service stations and echelon battery re-assembly utilization, zero time is needed, the levels of operators are uneven, and the characteristics of the batteries are not known. Once the connecting wire of the battery pack is connected in a wrong way, the input voltage of the subsequent application circuit generates negative voltage, the battery pack can not work normally, the BMS can be damaged with high probability, and the whole system can not work normally. If the battery assembly is finished, the problems can be found when the system is debugged, the problems are solved, and the workload for disassembling the battery box is huge, so that a simple and reliable detection device is needed on site, and the reliability of the connection of the wire harness is tested immediately before the battery box cover is covered after the wire harness is installed.
The existing method for detecting the connection wire harness of the battery pack comprises the following steps: manufacturing a wiring harness detection board, inserting the wiring harness detection board and the wiring harness into each other after the wiring harness is connected with the battery, and judging whether the connection of the wiring harness and each single battery is normal or not, wherein the circuit principle of the detection board is as shown in figure 2, a detection unit is arranged on each battery connecting wire and comprises an LED lamp connected with the battery in parallel and a current-limiting resistor connected with the LED lamp in series, when the connection of the wiring harness corresponding to the battery is normal, the input of the corresponding LED lamp is positive voltage, and the LED lamp is lightened; when there is a harness connection error, as shown in FIG. 3, item BN-2Road and BN+1Reverse connection, then LEDN-1And an LEDN+1The input voltage becomes negative and cannot be lit, and the LEDN-1And RN-1And an LEDN+1And RN+1Both series branches have to withstand the inverse of 2 batteriesTo voltage, and LEDN-2And RN-2And an LEDN+2And RN+2The two series branches bear forward voltage of 4 batteries, and because reverse withstand voltage of the LED is low, when the difference between the wrong connection position and the correct connection position of the connecting wire is large, the LED can be damaged. However, this detection method has two problems: when the battery connecting wire is not connected, as in B-th in FIG. 4NWhen the circuit is disconnected, the corresponding LED lamp of the circuit can still normally display, and the abnormal state of the connecting wire cannot be detected; when the wiring harness is electrically far away from the correct position (the voltage difference is large), the reverse withstand voltage of the LED is low, and the LED is easily damaged.
Disclosure of Invention
In view of the above, the present invention provides a fault detection circuit for a connection line of a battery pack, in which a voltage-dividing resistor is disposed at an interval in a detection unit, so that no matter a battery connection line of the battery pack is in an abnormal condition such as misconnection or misconnection, a light-emitting diode of a corresponding branch cannot be turned on, and a fault condition of the connection line of the battery pack can be accurately detected.
According to the fault detection circuit of the battery pack connecting line, the battery pack comprises a plurality of batteries which are connected in series, the fault detection circuit comprises a plurality of detection units which are correspondingly connected with the plurality of single batteries,
each detection unit comprises an indicating element and a current-limiting resistor, the indicating element is connected with the current-limiting resistor in series, the branches connected in series are connected at two ends of the battery corresponding to the detection unit in parallel,
in two adjacent detection units, one detection unit comprises a voltage dividing resistor, the voltage dividing resistor is connected with a battery corresponding to the detection unit in parallel, and the resistance value of the voltage dividing resistor is smaller than that of the current limiting resistor.
Preferably, among the plurality of detection units, a detection unit including a voltage dividing resistor is provided at an interval from a detection unit not including a voltage dividing resistor.
Preferably, the voltage dividing resistor is provided in the detection circuit corresponding to the even-numbered cell, or,
and the voltage division resistor is arranged in the detection circuit corresponding to the odd battery.
Preferably, the resistance value of the voltage dividing resistor is set as: (V)N+VN+1-VLN+1)*rN/(rN+RN+1)<VLN
Wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNTo indicate the conduction voltage drop of the element, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor.
Preferably, the resistance value of the current limiting resistor is set as:
an indicator element can be illuminated under normal conditions of a connection line of the battery pack;
the current flowing through the indicating element can be limited to be less than the safe current threshold value of the indicating element under the condition that the connecting line of the battery pack is abnormal.
Preferably, the current limiting resistor is a fixed resistor or a PTC thermistor.
Preferably, each detection unit comprises a voltage-resistant diode connected in series between the corresponding indicating element and the negative pole of the battery.
Preferably, the resistance value of the voltage dividing resistor is set as:
(VN+VN+1-VLN+1-VDN+1)*rN/(rN+RN+1)<VLN+VDN
wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNTo indicate the conduction voltage drop of the element, VDNIs the conduction voltage drop of the voltage-withstanding diode, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor.
Preferably, each detection unit comprises a first diode connected in anti-parallel across the indication unit.
Preferably, the indicator element is a light emitting diode.
In summary, according to the fault detection circuit of the battery pack connection line of the present invention, the voltage dividing resistor is disposed in the detection circuit corresponding to the even-numbered cell or the voltage dividing resistor is disposed in the detection circuit corresponding to the odd-numbered cell, so that the light emitting diodes of the corresponding branches cannot be turned on no matter the battery connection line of the battery pack is in abnormal conditions such as misconnection or misconnection, and the fault condition of the connection line of the battery pack can be accurately detected. And a voltage-resistant diode is connected in series between the light-emitting diode and the cathode of the battery, or a diode is connected in parallel at two ends of the light-emitting diode in a reverse direction, so that the light-emitting diode can be prevented from being damaged no matter what type of wrong connection of the connecting wire is.
Drawings
FIG. 1 is a block circuit diagram of a connection line between a battery pack and a battery management system;
FIG. 2 is a schematic circuit diagram of a wire harness detection board;
FIG. 3 is a schematic circuit diagram illustrating a wire harness misconnection of a prior art battery pack;
FIG. 4 is a schematic circuit diagram of a prior art battery pack with a missing wiring harness;
fig. 5 is a circuit diagram of a first embodiment of a fault detection circuit for a battery pack connection cord according to the present invention;
FIG. 6 is a schematic circuit diagram of a wiring harness missing connection of a battery pack according to the present invention;
fig. 7-1 is a circuit diagram of a second embodiment of a fault detection circuit for a battery pack connection cord in accordance with the present invention;
fig. 7-2 is a circuit diagram of a third embodiment of a fault detection circuit for a battery pack connection cord according to the present invention.
Detailed Description
Some preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings, and technical solutions in the embodiments of the present invention will be clearly and completely described, but the described embodiments are some, not all, embodiments of the present invention. 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.
Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first end" does not itself imply a positional limitation of "second end", and the term "second end" does not itself imply a positional limitation of "first end".
Referring to fig. 5, which is a circuit diagram of a fault detection circuit of a connection line of a battery pack according to the present invention, the battery pack in an embodiment of the present invention includes a plurality of batteries connected in series, such as N-2 to N +2 in the example of fig. 5, but the number is not limited thereto, and each battery in the battery pack is connected to a Battery Management System (BMS), as shown in fig. 1.
Referring to fig. 5, the fault detection circuit in this embodiment includes a plurality of detection units, where the plurality of detection units are correspondingly connected to the plurality of single batteries, each detection unit includes an indication element and a current limiting resistor, the indication element is connected in series with the current limiting resistor, a branch circuit after the series connection is connected in parallel to two ends of a battery corresponding to the detection unit, the indication element is a light emitting diode LED, the current limiting resistor is a resistor R as shown in fig. 5, an anode of the battery is connected to an anode of the light emitting diode through the current limiting resistor, and as known to those skilled in the art, the positions of the light emitting diode LED and the current limiting resistor may be interchanged.
For convenience of description, the battery and the corresponding detection unit of each path are denoted as an integral unit BNThus, the corresponding battery is denoted as N and the light emitting diode is denoted as LEDNThe current limiting resistor is denoted as RNIn this embodiment, the battery, the light emitting diode, and the current limiting resistor in each integral unit are devices with the same parameters, and are the same hereinafter. In this embodiment, one of the two adjacent detection units includes a voltage dividing resistor connected in parallel with the battery corresponding to the detection unit, and the nth unit includes a voltage dividing resistor rNThe voltage dividing resistor rNConnected to the positive and negative ends of the battery N.
In an embodiment according to the present invention, the plurality of detecting unitsIn the above embodiments, the detection unit including the voltage dividing resistor and the detection unit not including the voltage dividing resistor are disposed at an interval, and specifically, the voltage dividing resistor is disposed in the detection circuit corresponding to the even-numbered cell, or the voltage dividing resistor is disposed in the detection circuit corresponding to the odd-numbered cell. As shown in fig. 5, the N-2 th, nth, and N +2 th detection units respectively include a voltage dividing resistor rN-2And a voltage dividing resistor rNAnd a voltage dividing resistor rN+2。
Further, the resistance value of the voltage dividing resistor is smaller than that of the current limiting resistor, and specifically, the resistance value of the voltage dividing resistor is set as:
(VN+VN+1-VLN+1)*rN/(rN+RN+1)<VLN
wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNTo indicate the conduction voltage drop of the element, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor. Wherein, the current limiting resistor RNThe resistance value of (c) is set as: the LED can be lightened under the normal condition of the connecting wire of the battery packN(ii) a The current flowing through the indicating element can be limited to be less than the safety current threshold value of the light-emitting diode under the condition that the connecting wire of the battery pack is abnormal.
In this embodiment, the current limiting resistor is a common fixed resistor or a PTC thermistor. When the difference between the wrong connection position and the correct connection position of the connecting wire is large, the forward voltage borne by a certain branch is far larger than the voltage during normal connection, and the normal fixed resistor is difficult to ensure that the forward current is in the normal working range of the LED, so that the LED can be damaged. According to the characteristics of the PTC thermistor, the larger the current flows, the higher the PTC temperature rise, and the resistance value automatically increases, thereby reducing the flowing current value and protecting the LED from being damaged.
According to the detection scheme of the present embodiment, when the wire harness having the battery is not connected, as shown in fig. 6, when the B-th wire harness is connectedNThe wires of the circuit are not connected, and the voltage of the N and N +1 batteries is reduced by the light-emitting diode LEDN+1Then, a voltage dividing resistor rNAnd a current limiting resistor RN+1Voltage division due to a voltage dividing resistor rNLess than current limiting resistance RN+1The resistance value of (2), then the divider resistor rNThe divided voltage is smaller than that of the corresponding LED of the branch circuit according to the resistance value setting of the divider resistorNSo that the voltage of the voltage dividing resistor r is connectedNParallel current limiting resistor RNLight Emitting Diode (LED)NThe serial branch is not conducted, so that the LEDNCannot be lit; when all the wire harnesses are connected normally, the voltage of all the LED series branches is determined according to the voltage of the actual battery, the voltage dividing resistor and the current limiting resistor do not divide the voltage, and the LED of the corresponding branch is normally lightened.
When the wiring harness of the battery is connected incorrectly, the LED is turned onNThe input voltage becomes negative and therefore cannot be lit. As can be seen from the above, according to the wire harness detection scheme of the embodiment, no matter the battery connection line of the battery pack is in an abnormal condition such as misconnection or misconnection, the light emitting diode of the corresponding branch cannot be turned on, and the connection line fault condition of the battery pack can be accurately detected.
Referring to fig. 7-1, a second embodiment of the present invention is that a voltage-withstanding diode D is added to the first embodiment, and specifically, each detection unit includes a voltage-withstanding diode connected in series between the corresponding light-emitting diode and the negative electrode of the battery, as shown in fig. 7-1, the voltage-withstanding diode DNConnected to a Light Emitting Diode (LED)NAnd the negative electrode of the battery. In this embodiment, the withstand voltage value of the withstand voltage diode is greater than the sum of the maximum voltages of the battery pack, for example, if n strings of batteries are connected, the withstand voltage value is n × VbatIn which V isbatIs the single cell voltage.
Further, in this embodiment, the resistance values of the voltage dividing resistors are set to:
(VN+VN+1-VLN+1-VDN+1)*rN/(rN+RN+1)<VLN+VDN
wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNIs the conduction voltage drop of the light emitting diode, VDNIs the conduction voltage drop of the voltage-withstanding diode, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor.
By the same token, it can be inferred that when B isNWhen the linear speed is not connected, the voltage of the N and N +1 batteries is deducted from the LEDN+1And a withstand voltage diode DN+1Then, a voltage dividing resistor rNAnd a current limiting resistor RN+1Voltage division, known from the above equation, the voltage dividing resistance rNDivided voltage is less than that of the LEDNAnd a withstand voltage diode DNSo as to be equal to the divider resistance rNParallel Light Emitting Diode (LED)NAnd a withstand voltage diode DNThe branches of the series being non-conducting, i.e. LEDNCannot be lit.
In the embodiment, the abnormal condition of the battery connecting wire can be detected, in addition, in the embodiment, a voltage-withstanding diode is connected in series with the light-emitting diode LED of each branch, so that the reverse voltage withstanding of the light-emitting diode LED can be increased, and due to the fact that the reverse voltage withstanding of the diode is higher, the proper voltage withstanding of the diode is selected, any wire harness connection dislocation can be ensured, and the light-emitting diode LED cannot be damaged.
Referring to fig. 7-2, a third embodiment of the present invention is to add a first diode D2 to the first embodiment, where each detection unit includes a first diode connected in anti-parallel across the light emitting diode. In the embodiment, the abnormal condition of the battery connecting wire can be detected, in addition, in the embodiment, the first diode is connected in parallel to the light emitting diode LED of each branch, the reverse voltage of the light emitting diode LED can be clamped, and as the conduction voltage drop of the diode D2 is smaller than the reverse withstand voltage of the light emitting diode LED, any wire harness connection dislocation can be ensured, and the light emitting diode LED cannot be damaged.
The above description is made in detail for the preferred embodiment of the fault detection circuit of the battery pack connection line according to the present invention, but the circuits and advantages of the patent should not be considered as being limited to the above description, the disclosed embodiment and the accompanying drawings can better understand the present invention, therefore, the above disclosed embodiment and the accompanying drawings in the specification are included for better understanding of the present invention, the protection of the present invention is not limited to the scope of the present disclosure, and the replacement and modification of the embodiment of the present invention by those skilled in the art are within the protection scope of the present invention.
Claims (10)
1. A fault detection circuit for a connection line of a battery pack including a plurality of cells connected in series,
the fault detection circuit comprises a plurality of detection units which are correspondingly connected with the plurality of single batteries,
each detection unit comprises an indicating element and a current-limiting resistor, the indicating element is connected with the current-limiting resistor in series, the branches connected in series are connected at two ends of the battery corresponding to the detection unit in parallel,
in two adjacent detection units, one detection unit comprises a voltage dividing resistor, the voltage dividing resistor is connected with a battery corresponding to the detection unit in parallel, and the resistance value of the voltage dividing resistor is smaller than that of the current limiting resistor.
2. The fault detection circuit according to claim 1, wherein, of the plurality of detection units, a detection unit including a voltage dividing resistor is provided at an interval from a detection unit not including a voltage dividing resistor.
3. The failure detection circuit according to claim 2, wherein the voltage dividing resistor is provided in the detection circuit corresponding to the even-numbered battery, or,
and the voltage division resistor is arranged in the detection circuit corresponding to the odd battery.
4. The fault detection circuit according to any one of claims 1 to 3, wherein the resistance value of the voltage dividing resistor is set to:
(VN+VN+1-VLN+1)*rN/(rN+RN+1)<VLN
wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNTo indicate the conduction voltage drop of the element, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor.
5. The fault detection circuit of claim 4, wherein the current limiting resistor is set to a resistance value of:
an indicator element can be illuminated under normal conditions of a connection line of the battery pack;
the current flowing through the indicating element can be limited to be less than the safe current threshold value of the indicating element under the condition that the connecting line of the battery pack is abnormal.
6. The fault detection circuit of claim 5, wherein the current limiting resistor is a fixed resistor or a PTC thermistor.
7. A fault detection circuit according to any of claims 1 to 3, wherein each detection unit comprises a voltage tolerant diode connected in series between the corresponding indicator element and the negative pole of the battery.
8. The fault detection circuit of claim 7, wherein the resistance of the voltage divider resistor is set to:
(VN+VN+1-VLN+1-VDN+1)*rN/(rN+RN+1)<VLN+VDN
wherein VN、VN+1For two adjacent cell voltages, VLN+1、VLNTo indicate the conduction voltage drop of the element, VDNIs the conduction voltage drop of the voltage-withstanding diode, rNIs the resistance value of a voltage dividing resistor, RN+1Is the resistance value of the current-limiting resistor.
9. A fault detection circuit according to any of claims 1-3, wherein each detection unit comprises a first diode connected in anti-parallel across the indication unit.
10. A fault detection circuit according to any of claims 1 to 3, wherein the indicator element is a light emitting diode.
Priority Applications (1)
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| CN201911413130.7A CN111123168A (en) | 2019-12-31 | 2019-12-31 | Fault detection circuit of battery pack connecting line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911413130.7A CN111123168A (en) | 2019-12-31 | 2019-12-31 | Fault detection circuit of battery pack connecting line |
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| CN111123168A true CN111123168A (en) | 2020-05-08 |
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| CN201911413130.7A Pending CN111123168A (en) | 2019-12-31 | 2019-12-31 | Fault detection circuit of battery pack connecting line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693903A (en) * | 2020-05-22 | 2020-09-22 | 杭州高特电子设备股份有限公司 | Battery collection wire harness error-proofing detection circuit and wire harness detector |
| CN113589198A (en) * | 2021-07-29 | 2021-11-02 | 珠海中力新能源科技有限公司 | Line sequence detection method and device of battery acquisition line and battery management system |
-
2019
- 2019-12-31 CN CN201911413130.7A patent/CN111123168A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693903A (en) * | 2020-05-22 | 2020-09-22 | 杭州高特电子设备股份有限公司 | Battery collection wire harness error-proofing detection circuit and wire harness detector |
| CN113589198A (en) * | 2021-07-29 | 2021-11-02 | 珠海中力新能源科技有限公司 | Line sequence detection method and device of battery acquisition line and battery management system |
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