CN221507110U - Line sequence detection device of battery pack - Google Patents
Line sequence detection device of battery pack Download PDFInfo
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- CN221507110U CN221507110U CN202323272555.5U CN202323272555U CN221507110U CN 221507110 U CN221507110 U CN 221507110U CN 202323272555 U CN202323272555 U CN 202323272555U CN 221507110 U CN221507110 U CN 221507110U
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Abstract
The utility model discloses a line sequence detection device of a battery pack, which is used for detecting each electric core in the battery pack, and comprises a line sequence detection circuit, a polarity conversion circuit and a voltage acquisition circuit, wherein the line sequence detection circuit compares the positive electrode and the negative electrode of an electric signal of the electric core to output a detection signal; the polarity conversion circuit comprises a switch switching circuit, the input end of the switch switching circuit receives an electric signal of the battery core, the output end of the switch switching circuit is connected with the voltage acquisition circuit, the input end of the polarity conversion circuit is connected with the detection signal, the conduction path of the switch switching circuit is controlled according to the detection signal, the positive electrode signal and the negative electrode signal are controlled to be positively connected and conducted to the voltage acquisition circuit when the battery core is positively connected, the positive electrode signal and the negative electrode signal are controlled to be reversely connected and conducted to the voltage acquisition circuit when the battery core is reversely connected, and the voltage acquisition circuit acquires a voltage difference input by the polarity conversion circuit so as to obtain the sampling voltage of the battery core. The utility model can continuously detect the effective voltage of the battery cell when the wire harness is reversely connected between the battery cell of the battery pack and the gating switch unit.
Description
Technical Field
The utility model relates to the field of batteries, in particular to line sequence detection of a designed battery pack.
Background
The battery line sequence detection scheme in the current market mainly indicates through pure hardware scheme modes such as opto-coupler and LED lamp, and the function is single, can only simply judge the line sequence state of adjacent battery, often can't judge to the case that the wire harness is missed or many wire harnesses are reversely connected, and the range of application is not enough.
Therefore, there is an urgent need for a line sequence detecting apparatus for a battery pack that changes the above problems.
Disclosure of utility model
The utility model aims to provide a line sequence detection device of a battery pack, which can continuously detect the effective voltage of a battery cell when a wire harness is reversely connected between the battery cell of the battery pack and a gating switch unit.
In order to achieve the above purpose, the utility model discloses a line sequence detection device of a battery pack, which is used for detecting an electric signal of each electric core in the battery pack, and comprises a line sequence detection circuit, a polarity conversion circuit and a voltage acquisition circuit, wherein the line sequence detection circuit receives the electric signals of the electric cores and compares positive electrode signals and negative electrode signals at two ends of each electric core to output detection signals with corresponding high and low levels; the polarity conversion circuit comprises a switch switching circuit, wherein the input end of the switch switching circuit receives an anode signal and a cathode signal of the battery core, the output end of the switch switching circuit is connected with the anode input end and the cathode input end of the voltage acquisition circuit, the input end of the polarity conversion circuit is connected with the detection signal, the conduction path of the switch switching circuit is controlled according to the detection signal, when the anode signal of the battery core is larger than the cathode signal, the anode signal is controlled to be conducted to the anode input end, when the cathode signal of the battery core is larger than the anode signal, the anode signal is controlled to be conducted to the cathode input end, the voltage acquisition circuit acquires the voltage difference input by the polarity conversion circuit so as to obtain the sampling voltage of the battery core.
Compared with the prior art, the invention is provided with the polarity conversion circuit before the voltage acquisition circuit, so that when the wire harness of the battery cell in the battery pack is reversely connected to the gating switch unit, the polarity of the reversely connected signal is effectively converted and then is transmitted to the voltage acquisition circuit, and the wire sequence detection device can continuously detect the effective voltage of the battery cell when the wire harness is reversely connected between the battery cell of the battery pack and the gating switch unit.
Preferably, the line sequence detecting circuit includes a line sequence comparing circuit and a control circuit, the line sequence comparing circuit compares positive signals and negative signals at two ends of each electric core to output corresponding high-low level comparison signals, the control circuit includes a voltage input end, an output end of the voltage collecting circuit is connected with the voltage input end to convey the sampling voltage to the control circuit, and the control circuit is further connected with the comparison signals and converts the comparison signals into detection signals to be conveyed to the switch driving circuit.
Specifically, the line sequence comparison circuit comprises a first comparison circuit and a second comparison circuit, the first comparison circuit comprises a first voltage division starting circuit and a positive connection switch circuit, the control end of the positive connection switch circuit is connected with the output end of the first voltage division starting circuit, the input end of the positive connection switch circuit is connected with a constant voltage signal, the output end of the positive connection switch circuit is connected with an output comparison signal, the first voltage division starting circuit divides the voltage difference between the positive electrode signal and the negative electrode signal into a first voltage division driving voltage and then transmits the first voltage division driving voltage to the control end of the positive connection switch circuit, and therefore the positive connection switch circuit is conducted when the first voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, and the positive connection switch circuit outputs the constant voltage signal as an effective comparison signal; the second comparison circuit comprises a second voltage division starting circuit and a reverse connection switch circuit, the control end of the reverse connection switch circuit is connected with the output end of the second voltage division starting circuit, the input end of the reverse connection switch circuit is connected with a constant voltage signal, the output end of the reverse connection switch circuit is connected with an output comparison signal, the second voltage division starting circuit divides the voltage difference between the negative electrode signal and the positive electrode signal into a second voltage division driving voltage and then transmits the second voltage division driving voltage to the control end of the reverse connection switch circuit, and therefore when the second voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, the second voltage division driving voltage is conducted, and the output end of the reverse connection switch circuit outputs the constant voltage signal as an effective comparison signal; the control circuit converts the positive connection effective comparison signal into a positive connection effective signal and converts the negative connection effective comparison signal into a negative connection effective signal, and the detection signals comprise the positive connection effective signal and the negative connection effective signal.
Preferably, the line sequence detecting circuit includes a line sequence comparing circuit, the line sequence comparing circuit compares positive signals and negative signals at two ends of each electric core to output corresponding high and low level comparing signals, the line sequence comparing circuit includes a first comparing circuit and a second comparing circuit, the first comparing circuit includes a first voltage dividing starting circuit and a positive connection switching circuit, the control end of the positive connection switching circuit is connected with the output end of the first voltage dividing starting circuit, the input end of the positive connection switching circuit is connected with a constant voltage signal, the output end of the positive connection switching circuit is connected with the output end of the comparison signal, the first voltage dividing starting circuit divides the voltage difference between the positive signals and the negative signals into a first voltage dividing driving voltage and then transmits the first voltage dividing driving voltage to the control end of the positive connection switching circuit, so that the positive connection switching circuit is conducted when the first voltage dividing driving voltage is larger than the starting voltage of the positive connection switching circuit, and the positive connection switching circuit outputs the constant voltage signal as an effective comparing signal; the second comparison circuit comprises a second voltage division starting circuit and a reverse connection switch circuit, the control end of the reverse connection switch circuit is connected with the output end of the second voltage division starting circuit, the input end of the reverse connection switch circuit is connected with a constant voltage signal, the output end of the reverse connection switch circuit is connected with an output comparison signal, the second voltage division starting circuit divides the voltage difference between the negative electrode signal and the positive electrode signal into a second voltage division driving voltage and then transmits the second voltage division driving voltage to the control end of the reverse connection switch circuit, and therefore when the second voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, the second voltage division driving voltage is conducted, and the output end of the reverse connection switch circuit outputs the constant voltage signal as an effective comparison signal; the detection signals comprise a positive connection effective comparison signal and a negative connection effective comparison signal.
Preferably, the switching circuit comprises a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit, wherein the input end of the first switching circuit is connected with the positive electrode signal, the output end of the first switching circuit is connected with the positive electrode input end, the input end of the second switching circuit is connected with the negative electrode signal, the output end of the second switching circuit is connected with the negative electrode input end, the input end of the third switching circuit is connected with the negative electrode signal, the output end of the fourth switching circuit is connected with the positive electrode input end, the output end of the fourth switching circuit is connected with the negative electrode input end, when the negative electrode signal of the battery core is larger than the positive electrode signal, the first switching circuit and the second switching circuit are controlled to be conducted according to the detection signal, and when the negative electrode signal of the battery core is smaller than the positive electrode signal, the third switching circuit and the fourth switching circuit are controlled to be conducted according to the detection signal.
Specifically, the control ends of the first switch circuit and the second switch circuit are connected in parallel, the control ends of the third switch circuit and the fourth switch circuit are connected in parallel, and the input ends of the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit are respectively provided with a unidirectional conduction diode.
Preferably, the polarity conversion circuit further comprises a switch driving circuit, wherein the input end of the switch driving circuit is connected with the detection signal, the output end of the switch driving circuit is connected with the control end of the switch switching circuit, and the conduction path of the switch switching circuit is controlled according to the detection signal.
More specifically, the switch driving circuit comprises a first switch driving circuit and a second switch driving circuit, wherein the output end of the first switch driving circuit is connected with the control ends of the first switch circuit and the second switch circuit, and the output end of the second switch driving circuit is connected with the control ends of the third switch circuit and the fourth switch circuit.
More specifically, the detection signal includes a positive valid signal and a negative valid signal, the input of the first switch driving circuit is connected with the positive valid signal, and the input of the second switch driving circuit is connected with the negative valid signal.
Preferably, the line sequence detecting device further comprises a gating switch unit, the gating switch unit is connected with two ends of each electric core of the battery pack, the electric signals of each electric core of the battery pack are switched and conducted from an output end in a time division multiplexing mode, and the input ends of the line sequence detecting circuit and the switching circuit are respectively connected with the output end of the gating switch unit.
Drawings
Fig. 1 is a block diagram of a line sequence detecting device in embodiment 1 of the present utility model.
Fig. 2 is a block diagram of the line sequence detecting circuit of the present utility model.
Fig. 3 is a block diagram of a line sequence comparison circuit in the polarity inversion circuit of the present utility model.
Fig. 4 is a block diagram of a line sequence detecting device in embodiment 2 of the present utility model.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Example 1:
Referring to fig. 1, the utility model discloses a line sequence detecting device 100 of a battery pack, which is used for detecting an electric signal of each cell B1/B2/…/Bn in the battery pack, and comprises a gating switch unit 11, a line sequence detecting circuit 12, a polarity converting circuit 13 and a voltage acquisition circuit 14.
The voltage acquisition circuit is formed by connecting a plurality of resistors in series and is used for outputting the electric signals at two ends of the battery core by referring to a grounding point after dividing the electric signals. In this embodiment, the voltage sampling circuit includes a first resistor, a second resistor, and a third resistor connected in series between the positive input terminal v0+ and the negative input terminal V0-, and a sampling voltage is output between the first resistor and the second resistor, and the second resistor and the third resistor are grounded indirectly.
Referring to fig. 1, the gating switch unit 11 is connected to the electrical signal of each of the battery cells B1-Bn of the battery pack, and switches and conducts the electrical signal of each of the battery cells B1-Bn of the battery pack, where the gating switch unit 11 switches and conducts the electrical signal of each of the battery cells B1-Bn of the battery pack in a time-division multiplexing manner, and the input ends of the line sequence detection circuit 12 and the polarity conversion circuit 13 are connected to the output end of the gating switch unit 11 to receive the electrical signal of each of the battery cells B1-Bn. Of course, the electrical signal of each cell B1/B2/…/Bn may be directly transmitted to the line sequence detecting circuit 12 and the polarity converting circuit 13 without the gate switch unit 11, and n groups of the line sequence detecting circuit 12 and the polarity converting circuit 13 need to be provided to detect the electrical signal of each cell B1-Bn respectively.
The gating switch unit 11 takes a MOS switch or a miniature relay switch (including a mechanical relay and a photoelectric relay) SWAn as a core, and selects one of the n power cells to output in a time-division multiplexing manner. The gate switch units 11 respectively gate the voltages of the n power cores in one-to-one correspondence through the sequentially switched gate switch signals ENAn.
The total negative electrode of the battery pack is B0, the electric signal output by the positive electrode transmission line of the ith electric core is Bi, so that the battery pack is connected with the first gating unit 11 (the second gating unit 12) through n+1 electric core wires to be respectively connected with the wires B0 and B1 … Bn, wherein the electric signal bi+ output by the ith electric core corresponds to the wire Bi, the electric signal Bi-corresponds to the wire B (i-1), when the electric signals bi+ and Bi-output by the ith electric core, the first gating unit 11 conducts the switch corresponding to the wire Bi and the wire B (i-1), and when the electric signals b1+ and B1-output by the first electric core, the first gating unit 11 conducts the switch corresponding to the wire B1 and the wire B0.
Referring to fig. 1, the line sequence detecting circuit 12 is connected to the electrical signals of the electrical cores output by the gating switch unit 11, and compares the positive signal and the negative signal at two ends of each electrical core to output corresponding high-low level detecting signals VS1 and VS2.
Referring to fig. 2, the line sequence detecting circuit 12 includes a line sequence comparing circuit 21, the line sequence comparing circuit 21 compares the positive signal bi+ and the negative signal bi+ at two ends of each of the battery cells to output a corresponding high-low level comparing signal, and the line sequence comparing circuit 21 includes a first comparing circuit and a second comparing circuit.
Referring to fig. 2, the first comparing circuit includes a first voltage dividing start circuit 311 and a positive switch circuit 321, wherein a control end of the positive switch circuit 321 is connected to an output end of the first voltage dividing start circuit 311, an input end of the positive switch circuit 321 is connected to a constant voltage signal VDD, an output end of the positive switch circuit 321 is connected to an output comparing signal V1, the first voltage dividing start circuit 311 divides a voltage difference between the positive signal bi+ and the negative signal Bi-into a first voltage dividing driving voltage and then sends the first voltage dividing driving voltage to a control end of the positive switch circuit 321, so that the positive switch circuit 321 is turned on when the first voltage dividing driving voltage is greater than the starting voltage of the positive switch circuit 321, and the constant voltage signal VDD is output as an effective comparing signal V1.
The first voltage division starting circuit 311 is composed of a plurality of resistors and a unidirectional conduction diode ZD1, and comprises a voltage division circuit formed by connecting a plurality of resistors in series between a positive electrode signal bi+ and a negative electrode signal Bi-, and the unidirectional conduction diode ZD1 connected in series with the voltage division circuit, wherein the unidirectional conduction diode ZD1 is conducted from the positive electrode signal bi+ to the negative electrode signal Bi-, and the first voltage division starting circuit 311 outputs the voltage difference between the positive electrode signal bi+ and the negative electrode signal Bi-to the positive connection switch circuit 321 in a voltage division manner according to the corresponding proportion. The forward switch 321 is composed of a plurality of switch transistors (e.g. MOS transistors, triode), resistors, unidirectional conduction diodes, and is driven to be conducted by corresponding high and low levels.
Referring to fig. 2, the second comparing circuit includes a second voltage dividing start circuit 312 and a reverse switch circuit 322, wherein a control end of the reverse switch circuit 322 is connected to an output end of the second voltage dividing start circuit 312, an input end of the reverse switch circuit 322 is connected to a constant voltage signal VDD, an output end of the reverse switch circuit 322 is connected to an output comparing signal V2, the second voltage dividing start circuit 312 divides a voltage difference between the negative electrode signal Bi-and the positive electrode signal bi+ into a second voltage dividing driving voltage and then sends the second voltage dividing driving voltage to a control end of the reverse switch circuit 322, so that the second voltage dividing driving voltage is larger than the starting voltage of the reverse switch circuit 322, and the output end of the reverse switch circuit 322 outputs the constant voltage signal VDD as an effective comparing signal V2.
The second voltage division starting circuit 312 is composed of a plurality of resistors and a unidirectional conduction diode ZD2, and comprises a voltage division circuit formed by connecting a plurality of resistors in series between a negative electrode signal Bi-and a positive electrode signal bi+ and the unidirectional conduction diode ZD2 connected in series with the voltage division circuit, wherein the unidirectional conduction diode ZD2 is conducted in the direction of the positive electrode signal bi+ by the negative electrode signal Bi-, and the second voltage division starting circuit 312 outputs the voltage difference between the negative electrode signal Bi-and the positive electrode signal bi+ to the reverse connection switch circuit 322 in a voltage division mode according to the corresponding proportion. The reverse connection switch circuit 322 is composed of a plurality of switch tubes (such as MOS tubes and triodes), resistors and unidirectional conduction diodes, and is driven to be conducted by corresponding high and low levels.
In this embodiment, the positive valid comparison signal V1 is used as the positive valid signal VS1, the negative valid comparison signal V2 is used as the negative valid signal VS2, and the detection signals VS1 and VS2 include the positive valid signal VS1 and the negative valid signal VS2. The comparison signals V1 and V2 can also be used for detecting and judging whether the battery cell is disconnected, over-voltage or reversely connected.
Referring to fig. 3, the polarity conversion circuit 13 includes a switch switching circuit, an input end of the switch switching circuit is connected to a positive electrode signal bi+ and a negative electrode signal bi+ of the battery core output by the gate switch unit 11, an output end of the switch switching circuit is connected to a positive electrode input end v0+ and a negative electrode input end V0-of the voltage acquisition circuit 14, an input end of the polarity conversion circuit 13 is connected to the detection signals VS1 and VS2, a conduction path of the switch switching circuit is controlled according to the detection signals VS1 and VS2, and when the positive electrode signal bi+ of the battery core is greater than the negative electrode signal Bi-, an outgoing line of the battery core is connected positively, the positive electrode signal bi+ is controlled to be conducted to the positive electrode input end v0+ and the negative electrode signal Bi-is controlled to be conducted to the negative electrode input end V0-. When the negative electrode signal Bi+ of the battery cell is larger than the positive electrode signal Bi+ (the outgoing line of the battery cell is reversely connected), the positive electrode signal Bi+ is controlled to be conducted to the negative electrode input end V0-, the negative electrode signal Bi-is controlled to be conducted to the positive electrode input end V0+, and the voltage acquisition circuit 14 acquires the voltage difference input by the polarity conversion circuit 13 so as to obtain the sampling voltage of the battery cell.
That is, in operation, the polarity switching circuit 13 controls the positive electrode signal bi+ and the negative electrode signal Bi-to be connected to the voltage acquisition circuit 14 when the battery cells are connected in positive direction, and controls the positive electrode signal bi+ and the negative electrode signal Bi-to be connected to the voltage acquisition circuit 14 when the battery cells are connected in reverse direction.
The switch switching circuit includes a first switch circuit 21, a second switch circuit 22, a third switch circuit 23 and a fourth switch circuit 24, wherein the input end of the first switch circuit 21 is connected with the positive electrode signal bi+, the output end is connected with the positive electrode input end v0+, the input end of the second switch circuit 22 is connected with the negative electrode signal Bi-, the output end is connected with the negative electrode input end V0-, the input end of the third switch circuit 23 is connected with the negative electrode signal Bi-, the output end is connected with the positive electrode input end v0+, the input end of the fourth switch circuit 24 is connected with the positive electrode signal bi+, the output end is connected with the negative electrode input end V0-, the polarity conversion circuit 13 controls the first switch circuit 21 and the second switch circuit 22 to be turned on according to the detection signals VS1 and VS2 when the negative electrode signal Bi-of the battery core is smaller than the positive electrode signal bi+, and controls the third switch circuit 23 and the fourth switch circuit 24 to be turned on according to the detection signals VS1 and VS2 when the negative electrode signal Bi-of the battery core is larger than the positive electrode signal bi+.
Referring to fig. 3, the polarity conversion circuit 13 further includes switch driving circuits 431 and 432, wherein the input ends of the switch driving circuits 431 and 432 are connected with the detection signals VS1 and VS2, the output ends of the switch driving circuits are connected with the control ends of the switch switching circuits (21-23), and the conduction paths of the switch switching circuits are controlled according to the detection signals VS1 and VS 2.
The control ends of the first switch circuit 21 and the second switch circuit 22 are connected in parallel, the control ends of the third switch circuit 23 and the fourth switch circuit 24 are connected in parallel, and the input ends of the first switch circuit 21, the second switch circuit 22, the third switch circuit 23 and the fourth switch circuit 24 are respectively provided with a unidirectional conduction diode. The first switch circuit 21, the second switch circuit 22, the third switch circuit 23 and the fourth switch circuit 24 have the same structure and are composed of a plurality of switch tubes (such as triodes and MOS tubes), diodes and resistors.
Referring to fig. 3, the switch driving circuit includes a first switch driving circuit 431 and a second switch driving circuit 432, wherein an output end of the first switch driving circuit 431 is connected to control ends of the first switch circuit 21 and the second switch circuit 22, and an output end of the second switch driving circuit 432 is connected to control ends of the third switch circuit 23 and the fourth switch circuit 24. The first switch driving circuit 431 and the second switch driving circuit 432 have the same structure and are composed of a voltage dividing circuit connected in series between the detection signal and the ground. In this embodiment, the effective detection signal is a high level signal, and when the effective detection signal is a low level signal, the first switch driving circuit 431 and the second switch driving circuit 432 are composed of voltage dividing circuits connected in series between a constant high level and the detection signal. Specifically, the detection signals VS1 and VS2 include a positive valid signal VS1 and a negative valid signal VS2, the input end of the first switch driving circuit 431 is connected to the positive valid signal VS1, and the input end of the second switch driving circuit 432 is connected to the negative valid signal VS2.
When the device is in operation, if an electrical signal of a certain cell is collected, the gating switch unit 11 gates the electrical signal of the cell to the line sequence detection circuit 12, if the lead-out wire of the cell is connected positively, the first voltage division driving voltage output by the first voltage division starting circuit 311 drives the positive connection switch circuit 321 to be conducted, so as to output an effective comparison signal V1, at this time, the reverse connection switch circuit 322 is not conducted, and the comparison signal V2 is not effective. The effective comparison signal V1 is used as an effective detection signal VS1 to enable the first switch circuit 21 and the second switch circuit 22 of the polarity conversion circuit 13 to be turned on, the positive input terminal v0+ obtains a positive signal bi+ and the negative input terminal V0-obtains a negative signal Bi-, and the voltage acquisition circuit 14 acquires a voltage difference between the positive signal bi+ and the negative signal Bi-input by the polarity conversion circuit 13 to obtain a sampling voltage of the battery cell.
When the device is in operation, if an electrical signal of a certain cell is collected, the gating switch unit 11 gates the electrical signal of the cell to the line sequence detection circuit 12, if the lead-out line of the cell is reversely connected, the second voltage division driving voltage output by the second voltage division starting circuit 312 drives the reversely connected switch circuit 322 to be conducted, so that an effective comparison signal V2 is output, at the moment, the normally connected switch circuit 321 is not conducted, and the comparison signal V1 is not effective. The effective comparison signal V2 is used as an effective detection signal VS2 to enable the third switch circuit 23 and the fourth switch circuit 24 of the polarity conversion circuit 13 to be turned on, the positive electrode input end v0+ obtains the negative electrode signal Bi-, the negative electrode input end V0-obtains the positive electrode signal bi+, and the voltage acquisition circuit 14 acquires the voltage difference between the negative electrode signal Bi-input by the polarity conversion circuit 13 and the positive electrode signal bi+ to obtain the sampling voltage of the battery cell.
Example 2:
Referring to fig. 4, unlike embodiment 1, in embodiment 2, the line sequence detecting circuit 12 further includes a control circuit 22 in addition to the line sequence comparing circuit 21, the structure of the line sequence comparing circuit 21 is the same as that of embodiment, the positive electrode signal bi+ and the negative electrode signal bi+ at both ends of each of the battery cells are compared to output the corresponding high-low level comparison signals V1 and V2, the control circuit 22 includes a voltage input terminal, the output terminal of the voltage collecting circuit 14 is connected to the voltage input terminal to supply the sampling voltage to the control circuit 22, and the control circuit 22 further connects the comparison signals V1 and V2 and converts the comparison signals V1 and V2 into detection signals VS1 and VS2 and supplies the detection signals VS1 and VS2 to the switch driving circuit of the polarity converting circuit 13. Of course, the polarity conversion circuit 13 may not have a switch driving circuit, and the detection signals VS1 and VS2 may be directly connected to the control end of the switch switching circuit, so as to be used as driving signals of the switch switching circuit to control the selection on/off of the switch switching circuit.
The control circuit 33 may include a switch circuit connected in series between a preset voltage and ground to convert the comparison signals V1 and V2 into detection signals VS1 and VS2, so that the effective comparison signals V1 and V2 are converted into effective detection signals VS1 and VS2 of corresponding voltages, and the switch of the switch circuit in the polarity conversion circuit may be effectively driven.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (10)
1. The utility model provides a line preface detection device of group battery for detect every electric core in the group battery, its characterized in that: the battery cell detection circuit receives the electric signals of the battery cells, compares positive signals and negative signals at two ends of each battery cell, and outputs detection signals; the polarity conversion circuit comprises a switch switching circuit, wherein the input end of the switch switching circuit receives an anode signal and a cathode signal of the battery core, the output end of the switch switching circuit is connected with the anode input end and the cathode input end of the voltage acquisition circuit, the input end of the polarity conversion circuit is connected with the detection signal, the conduction path of the switch switching circuit is controlled according to the detection signal, when the anode signal of the battery core is larger than the cathode signal, the anode signal is controlled to be conducted to the anode input end, when the cathode signal of the battery core is larger than the anode signal, the anode signal is controlled to be conducted to the cathode input end, the voltage acquisition circuit acquires the voltage difference input by the polarity conversion circuit so as to obtain the sampling voltage of the battery core.
2. The line sequence detecting apparatus of a battery pack according to claim 1, wherein: the line sequence detection circuit comprises a line sequence comparison circuit and a control circuit, wherein the line sequence comparison circuit compares positive signals and negative signals at two ends of each electric core so as to output comparison signals with corresponding high and low levels, the control circuit comprises a voltage input end, the output end of the voltage acquisition circuit is connected with the voltage input end so as to convey the sampling voltage to the control circuit, and the control circuit is also connected with the comparison signals, converts the comparison signals into detection signals and conveys the detection signals to the polarity conversion circuit.
3. The line sequence detecting apparatus of a battery pack according to claim 2, wherein: the line sequence comparison circuit comprises a first comparison circuit and a second comparison circuit, the first comparison circuit comprises a first voltage division starting circuit and a positive connection switch circuit, the control end of the positive connection switch circuit is connected with the output end of the first voltage division starting circuit, the input end of the positive connection switch circuit is connected with a constant voltage signal, the output end of the positive connection switch circuit is connected with an output comparison signal, the first voltage division starting circuit divides the voltage difference between the positive electrode signal and the negative electrode signal into a first voltage division driving voltage and then transmits the first voltage division driving voltage to the control end of the positive connection switch circuit, and therefore the positive connection switch circuit is conducted when the first voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, and the positive connection switch circuit outputs the constant voltage signal as an effective comparison signal; the second comparison circuit comprises a second voltage division starting circuit and a reverse connection switch circuit, the control end of the reverse connection switch circuit is connected with the output end of the second voltage division starting circuit, the input end of the reverse connection switch circuit is connected with a constant voltage signal, the output end of the reverse connection switch circuit is connected with an output comparison signal, the second voltage division starting circuit divides the voltage difference between the negative electrode signal and the positive electrode signal into a second voltage division driving voltage and then transmits the second voltage division driving voltage to the control end of the reverse connection switch circuit, and therefore when the second voltage division driving voltage is larger than the starting voltage of the reverse connection switch circuit, the second voltage division driving voltage is conducted, and the output end of the reverse connection switch circuit outputs the constant voltage signal as an effective comparison signal; the control circuit converts the positive connection effective comparison signal into a positive connection effective signal and converts the negative connection effective comparison signal into a negative connection effective signal, and the detection signals comprise the positive connection effective signal and the negative connection effective signal.
4. The line sequence detecting apparatus of a battery pack according to claim 1, wherein: the line sequence detection circuit comprises a line sequence comparison circuit, wherein the line sequence comparison circuit compares positive electrode signals and negative electrode signals at two ends of each battery cell to output comparison signals with corresponding high and low levels, the line sequence comparison circuit comprises a first comparison circuit and a second comparison circuit, the first comparison circuit comprises a first voltage division starting circuit and a positive connection switch circuit, the control end of the positive connection switch circuit is connected with the output end of the first voltage division starting circuit, the input end of the positive connection switch circuit is connected with a constant voltage signal, the output end of the positive connection switch circuit is connected with the output comparison signal, the first voltage division starting circuit divides the voltage difference between the positive electrode signals and the negative electrode signals into a first voltage division driving voltage and then transmits the first voltage division driving voltage to the control end of the positive connection switch circuit, and therefore the positive connection switch circuit is conducted when the first voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, and the positive connection switch circuit outputs the constant voltage signal as an effective comparison signal; the second comparison circuit comprises a second voltage division starting circuit and a reverse connection switch circuit, the control end of the reverse connection switch circuit is connected with the output end of the second voltage division starting circuit, the input end of the reverse connection switch circuit is connected with a constant voltage signal, the output end of the reverse connection switch circuit is connected with an output comparison signal, the second voltage division starting circuit divides the voltage difference between the negative electrode signal and the positive electrode signal into a second voltage division driving voltage and then transmits the second voltage division driving voltage to the control end of the reverse connection switch circuit, and therefore when the second voltage division driving voltage is larger than the starting voltage of the positive connection switch circuit, the second voltage division driving voltage is conducted, and the output end of the reverse connection switch circuit outputs the constant voltage signal as an effective comparison signal; the detection signals comprise a positive connection effective comparison signal and a negative connection effective comparison signal.
5. The line sequence detecting apparatus of a battery pack according to claim 1, wherein: the switch switching circuit comprises a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit, wherein the input end of the first switch circuit is connected with the positive electrode signal, the output end of the first switch circuit is connected with the positive electrode input end, the input end of the second switch circuit is connected with the negative electrode signal, the output end of the second switch circuit is connected with the negative electrode input end, the input end of the third switch circuit is connected with the negative electrode signal, the output end of the third switch circuit is connected with the positive electrode input end, the input end of the fourth switch circuit is connected with the positive electrode signal, the output end of the fourth switch circuit is connected with the negative electrode input end, when the negative electrode signal of the battery core is larger than the positive electrode signal, the first switch circuit and the second switch circuit are controlled to be conducted according to the detection signal, and when the negative electrode signal of the battery core is smaller than the positive electrode signal, the third switch circuit and the fourth switch circuit are controlled to be conducted according to the detection signal.
6. The line sequence detecting apparatus of a battery pack according to claim 5, wherein: the control ends of the first switch circuit and the second switch circuit are connected in parallel, the control ends of the third switch circuit and the fourth switch circuit are connected in parallel, the input ends of the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit are respectively provided with a unidirectional conduction diode, the control ends of the first switch circuit and the second switch circuit are connected in parallel, and the structures of the third switch circuit and the fourth switch circuit are the same.
7. The line sequence detecting apparatus of a battery pack according to claim 5, wherein: the polarity conversion circuit further comprises a switch driving circuit, wherein the input end of the switch driving circuit is connected with the detection signal, the output end of the switch driving circuit is connected with the control end of the switch switching circuit, and the detection signal is converted into starting voltage so as to control the conduction path of the switch switching circuit according to the detection signal.
8. The line sequence detecting apparatus of a battery pack according to claim 7, wherein: the switch driving circuit comprises a first switch driving circuit and a second switch driving circuit, wherein the output end of the first switch driving circuit is connected with the control ends of the first switch circuit and the second switch circuit, and the output end of the second switch driving circuit is connected with the control ends of the third switch circuit and the fourth switch circuit.
9. The line sequence detecting apparatus of a battery pack according to claim 8, wherein: the detection signals comprise a positive connection effective signal and a negative connection effective signal, the input end of the first switch driving circuit is connected with the positive connection effective signal, and the input end of the second switch driving circuit is connected with the negative connection effective signal.
10. The line sequence detecting apparatus of a battery pack according to claim 1, wherein: the battery pack also comprises a gating switch unit, wherein the gating switch unit is connected with two ends of each battery core of the battery pack, the electric signals of each battery core of the battery pack are switched and conducted out from an output end in a time-sharing multiplexing mode, and the input ends of the line sequence detection circuit and the switch switching circuit are respectively connected with the output end of the gating switch unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117639172A (en) * | 2023-11-30 | 2024-03-01 | 东莞市达锂电子有限公司 | Active balancing method and active balancing device for adaptive cell string number |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117639172A (en) * | 2023-11-30 | 2024-03-01 | 东莞市达锂电子有限公司 | Active balancing method and active balancing device for adaptive cell string number |
| CN117639172B (en) * | 2023-11-30 | 2025-01-17 | 东莞市达锂电子有限公司 | Active equalization method and active equalization device for self-adaption of cell string number |
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