CN210404724U - Balanced failure protection circuit, battery and battery pack - Google Patents

Balanced failure protection circuit, battery and battery pack Download PDF

Info

Publication number
CN210404724U
CN210404724U CN201921518425.6U CN201921518425U CN210404724U CN 210404724 U CN210404724 U CN 210404724U CN 201921518425 U CN201921518425 U CN 201921518425U CN 210404724 U CN210404724 U CN 210404724U
Authority
CN
China
Prior art keywords
voltage
battery
voltage stabilizing
cell
protection circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201921518425.6U
Other languages
Chinese (zh)
Inventor
陆柱立
罗云聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Xaircraft Technology Co Ltd
Original Assignee
Guangzhou Xaircraft Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Xaircraft Technology Co Ltd filed Critical Guangzhou Xaircraft Technology Co Ltd
Priority to CN201921518425.6U priority Critical patent/CN210404724U/en
Application granted granted Critical
Publication of CN210404724U publication Critical patent/CN210404724U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The application provides a balanced failure protection circuit, a battery and a battery pack, and relates to the technical field of batteries, wherein the balanced failure protection circuit comprises a resistor, a switching device and a voltage stabilizing device; the resistor is connected with the switching device in series and then connected to two ends of the battery cell in parallel; the switch device is used for changing the on-off state according to the balancing instruction of the battery management chip so as to balance the battery core; the voltage stabilizing device is used for conducting when the on-off state of the switch device is a conducting state and the voltage of the battery cell is higher than a voltage stabilizing value of the voltage stabilizing device so as to realize balance of battery cell discharge; the voltage stabilizing device is also used for switching off when the cell voltage is lower than a voltage stabilizing value so as to prevent the cell from being over-discharged. Through add the voltage regulation device in equalizer circuit, when the steady voltage value of voltage regulation device was discharged to electric core voltage, the voltage regulation device can break off promptly, avoided electric core to cross to put, even balanced control inefficacy or switch failure, because the voltage regulation performance of voltage regulation device self also can in time turn-off the return circuit, prevented that electric core from crossing to put.

Description

Balanced failure protection circuit, battery and battery pack
Technical Field
The application relates to the technical field of batteries, in particular to a balanced failure protection circuit, a battery and a battery pack.
Background
The lithium battery has the advantages of light weight, high energy density, small environmental pollution and the like, is widely applied to the industry of the unmanned aerial vehicle, and supplies power to the unmanned aerial vehicle by connecting a plurality of lithium batteries in series to improve the voltage. When the lithium batteries are used in series, a lithium battery management protection board is added to balance the lithium batteries, so that the voltages of the battery cores tend to be consistent. The balance function of the protection board is generally realized by detecting the voltage of the battery cell, if a certain voltage is higher than other battery cells, a resistor connected with the battery cell in parallel is switched on through a switching device, and the battery cell is discharged until the voltage of the battery cell is consistent with the voltage of other battery cells.
However, if the battery pack is improperly controlled or the switching device fails, the battery cell discharges through the resistor until the electric quantity of the battery cell is exhausted, so that the whole battery pack is scrapped.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a balanced failure protection circuit, battery and group battery to lead to the problem that electric core was put excessively when improving current equalizer circuit inefficacy.
The utility model discloses a realize like this:
in a first aspect, the present invention provides a balanced failure protection circuit, which includes a resistor, a switch device and a voltage regulator device; the switching device comprises a control terminal; the resistor is connected with the switching device in series and then connected to two ends of the battery cell in parallel; the control end is used for being electrically connected with the battery management chip; the control end is used for receiving a balancing instruction of the battery management chip; the switch device is used for changing the on-off state according to the balancing instruction of the battery management chip so as to balance the battery core; the voltage stabilizing device is used for conducting when the on-off state of the switch device is a conducting state and the cell voltage is higher than a voltage stabilizing value of the voltage stabilizing device so as to enable the cell to discharge to realize balance; the voltage stabilizing device is also used for switching off when the cell voltage is lower than a voltage stabilizing value so as to prevent the over-discharge of the cell.
With reference to the first implementation manner of the first aspect, the voltage stabilizing device is disposed between the switching device and the battery cell; when the switching device switches the state to a conduction state according to the equalization instruction, the voltage stabilizing device is used for conducting to equalize the battery cell when the battery cell voltage is higher than the voltage stabilizing value.
With reference to the first implementation manner of the first aspect, the voltage regulator device is a voltage regulator diode, a negative electrode of the voltage regulator diode is electrically connected to a positive electrode of the battery cell after being connected in series with the resistor, and a positive electrode of the voltage regulator diode is electrically connected to the switch device.
With reference to the second implementation manner of the first aspect, the voltage regulator device is disposed between the control terminal and the battery management chip, and the battery management chip sends an equalization instruction signal to the control terminal through the voltage regulator device; the voltage of the equalization instruction signal is consistent with the cell voltage; the voltage stabilizing device is used for conducting when the voltage of the equalization instruction signal exceeds the voltage stabilizing value so as to equalize the battery cell; the voltage stabilizing device is further used for switching off when the voltage of the equalization instruction signal is lower than the voltage stabilizing value so as to prevent the battery core from being over-discharged.
With reference to the second implementation manner of the first aspect, the voltage regulator device is a voltage regulator diode, a negative electrode of the voltage regulator diode is electrically connected to the battery management chip, and a positive electrode of the voltage regulator diode is electrically connected to the control terminal of the switching device.
With reference to the third implementation manner of the first aspect, the voltage regulator device includes a first voltage regulator diode and a second voltage regulator diode, a negative electrode of the first voltage regulator diode is electrically connected to a positive electrode of the battery cell after being connected in series with the resistor, and a positive electrode of the first voltage regulator diode is electrically connected to the switch device; and the cathode of the second voltage stabilizing diode is electrically connected with the battery management chip, and the anode of the second voltage stabilizing diode is electrically connected with the control end of the switching device.
With reference to the first aspect, the voltage regulation value of the voltage regulation device is greater than or equal to the lowest operating voltage of the battery core.
With reference to the first aspect, the switching device is one of a field effect transistor, a thyristor, a transistor, or a combination thereof.
In a second aspect, the utility model provides a battery, battery includes battery management chip, a plurality of electric core and a plurality of foretell balanced failure protection circuit, battery management chip with electric core electricity is connected, each electric core corresponds and sets up one balanced failure protection circuit.
A third aspect of the present invention provides a battery pack, the battery pack includes a battery management chip, a plurality of batteries and a balancing failure protection circuit, the battery management chip with the battery electricity is connected, each the battery corresponds and sets up one the balancing failure protection circuit.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a balanced fail safe circuit, battery and group battery, balanced fail safe circuit includes resistance, switching element and voltage regulator device; the resistor is connected with the switching device in series and then connected to two ends of the battery cell in parallel; the switch device is used for changing the on-off state according to the balancing instruction of the battery management chip so as to balance the battery core; the voltage stabilizing device is used for conducting when the on-off state of the switch device is a conducting state and the voltage of the battery cell is higher than a voltage stabilizing value of the voltage stabilizing device so as to realize balance of battery cell discharge; the voltage stabilizing device is also used for switching off when the cell voltage is lower than a voltage stabilizing value so as to prevent the cell from being over-discharged. Through add the voltage regulation device in equalizer circuit, when the steady voltage value of voltage regulation device was discharged to electric core voltage, the voltage regulation device can break off promptly, avoided electric core to cross to put, even balanced control inefficacy or switch failure, because the voltage regulation performance of voltage regulation device self also can in time turn-off the return circuit, prevented that electric core from crossing to put.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic diagram of a conventional equalization circuit.
Fig. 2 shows a schematic diagram of an equalization failure protection circuit provided in an embodiment of the present application.
Fig. 3 shows a circuit schematic diagram of an equalization failure protection circuit according to an embodiment of the present application.
Fig. 4 shows a circuit schematic diagram of another equalization failure protection circuit provided in the embodiment of the present application.
Fig. 5 shows a circuit schematic diagram of another equalization failure protection circuit provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The lithium battery has the advantages of light weight, high energy density, small environmental pollution and the like, is widely applied to the industry of the unmanned aerial vehicle, and supplies power to the unmanned aerial vehicle by connecting a plurality of lithium batteries in series to improve the voltage. When the battery is used, due to individual difference among batteries, the battery or the battery cell with the minimum capacity is easy to be overcharged during charging, the battery or the battery cell with the minimum capacity is easy to be overdischarged during discharging, and the battery or the battery cell with the minimum capacity is damaged, so that the whole capacity of the battery is smaller, and the battery falls into vicious circle. Therefore, the equalization is needed between different batteries or between each battery cell inside the single battery, and the equalization aims to eliminate the inconsistency between different batteries or battery cells, so as to avoid the phenomenon of over-charging or over-discharging.
The battery equalization is generally divided into active equalization and passive equalization, the active equalization transfers high monomer energy to low monomer energy through energy transfer, or supplements the battery or electric core with the lowest monomer energy with the energy of the whole group of batteries or electric cores, the passive equalization is a resistance energy consumption type, each single battery or electric core is connected with a resistor in parallel, the energy of the battery or electric core with high energy is consumed, and the equalization of the whole battery or battery pack is completed.
Referring to fig. 1, fig. 1 shows a schematic diagram of a conventional passive equalization circuit. The battery generally includes a plurality of battery cells (e.g., B1, B2 … Bn), and a passive equalization circuit is disposed in each battery cell. In the process of balancing the battery, if the battery management chip detects the voltage V of the battery cell B1B1And if the ratio is higher, it is determined that the discharge equalization needs to be performed on the battery cell 1. Generally, the battery management chip controls the switching device K1 to be turned on through the control port BL1, and the battery cell B1 discharges through the resistor R1. However, the equalization circuit is easily out of control, if the BL1 is controlled to be always controlled to be switched on by the K1 due to improper control, or the switching device K1 is damaged due to short circuit caused by plugging and unplugging of the equalization line, the battery cell B1 will discharge through the R1 until the electric quantity of the battery cell B1 is discharged, and the whole battery pack is discarded.
In order to avoid the equalization failure or the over-discharge of the battery caused by the failure of the switching device, the embodiment of the application provides an equalization failure protection circuit, which is used for equalizing the battery and simultaneously avoiding the over-discharge of a battery cell. Referring to fig. 2, fig. 2 shows a schematic diagram of an equalization failure protection circuit provided in an embodiment of the present application.
The balanced failure protection circuit that this application embodiment provided includes resistance R, switching device K and voltage regulator device ZV, and resistance R connects in parallel at battery electric core B's both ends after establishing ties with switching device K, and when the return circuit switched on, resistance R can consume electric core B's energy, with unnecessary energy consumption in electric core B, realizes electric core B's equilibrium.
The switching device K can be one or a combination of a field effect transistor, a thyristor and a transistor, the switching device K comprises a control end, the control end is electrically connected with the battery management chip to receive a balancing instruction of the battery management chip, and the switching device K is used for changing the on-off state according to the balancing instruction of the battery management chip to balance the battery core B. For example, if the voltage of a certain battery cell B is higher than the voltages of other battery cells B, the battery management chip controls the switching device K corresponding to the battery cell B to be turned on, and the resistance R is used to consume the energy of the battery cell B, so that the electric quantity of the battery cell B is reduced and balanced. Generally, the equalization instruction comprises start equalization and stop equalization, when the equalization instruction received by the switching device K is the start equalization, the switching device K is conducted, the loop is conducted, and the battery cell B discharges to perform equalization; when the balancing instruction received by the switching device K is to stop balancing, the switching device K is disconnected, the loop is not conducted, and the battery cell B stops discharging the resistor R to stop balancing.
If switching device K became invalid or battery management chip control became invalid, switching device K was in the state that continuously switches on, can lead to electric core B to be in the state of discharging always, until the electric quantity exhausts completely, electric core B overdischarging can lead to whole battery or group battery to scrap, in order to avoid electric core B overdischarging, the balanced failure protection circuit that this application embodiment provided is provided with voltage stabilizing device ZV, when balanced instruction was for starting the equilibrium, switching device K switches on, if electric core B voltage was higher than voltage stabilizing device ZV's steady voltage value this moment, voltage stabilizing device ZV switches on so that electric core B discharges and realizes the equilibrium.
If battery core B lasts discharge, battery core B's voltage reduces, when battery core B voltage reduces to the steady voltage value of steady voltage device ZV, steady voltage device ZV can turn off, avoids battery core B to cross to put, leads to battery core B or battery to damage. For example, if the control of the battery management chip makes a mistake or the switching device K fails, the switching device K is continuously in the on state, the battery cell B may be always discharged, in order to prevent the over-discharge of the battery cell B, the voltage stabilizing device ZV provided by the equalization failure protection circuit according to this embodiment may be turned off when the voltage of the battery cell B is lower than the voltage stabilizing value, due to the voltage stabilizing characteristic of the voltage stabilizing device ZV, the circuit is turned off when the voltage difference is smaller than the voltage stabilizing value, the battery cell B may not continue to discharge, and the over-discharge of the battery cell B may be prevented.
The balanced protection circuit that loses efficacy that this application embodiment provided through set up zener device ZV in the return circuit, zener device ZV can not switch on when electric core B voltage drops to below the zener value, even balanced inefficacy or switching element K became invalid, zener device ZV also can turn off the circuit that discharges in time, prevents that electric core B from discharging always and leading to the overdischarge.
Voltage regulator device ZV is for having certain device that switches on the pressure drop, should switch on the pressure drop and be voltage regulation value of voltage regulator device ZV promptly, in order to make electric core B's electric quantity can keep in healthy state, voltage regulation device ZV's voltage regulation value is higher than or equal to electric core B's minimum operating voltage, electric core B can keep the required minimum voltage level of normal operating condition promptly, thereby no matter in any kind of circumstances, electric core B can not discharge to the state that voltage is less than minimum operating voltage, prevent that electric core B from damaging.
Referring to fig. 3, fig. 3 is a circuit diagram illustrating an equalizing failure protection circuit according to an embodiment of the present disclosure.
The balance failure protection circuit is arranged between the battery cores and the battery management chip, and for a battery with a plurality of battery cores, each battery core is correspondingly provided with one balance failure protection circuit so as to prevent any battery core from being over-discharged. If the equalization failure protection circuit is used for equalizing and protecting a plurality of batteries in the battery pack, each single battery is correspondingly provided with one equalization failure protection circuit.
The embodiment of the application explains with the balanced failure protection circuit applied to the battery cell B1 of the battery as an example, and the balanced failure protection circuit provided by the embodiment of the application comprises a resistor R1, a switching device K1 and a voltage stabilizing device ZV, wherein the voltage stabilizing device ZV is arranged between the switching device K1 and the battery cell B1.
Specifically, the resistor R1 is connected in series with the voltage regulator device ZV and then disposed between the positive electrode of the battery cell B1 and the switch device K1, wherein the resistor R1 includes a first end and a second end, the first end of the resistor R1 is electrically connected to the positive electrode of the battery cell B1, the second end of the resistor R1 is electrically connected to the first end of the voltage regulator device ZV, and the second end of the voltage regulator device ZV is electrically connected to the switch device K1. The switching device K1 can be one of field effect transistor, thyristor, transistor or their combination, switching device K1 includes the control end, the control end is connected with battery management chip electricity, battery management chip can be through control end to switching device K1 output balanced instruction, balanced instruction is including starting the equilibrium and stopping the equilibrium, if the balanced instruction that switching device K1 received is when stopping the equilibrium, switching device K1 disconnection, the return circuit does not switch on, battery core B1 does not discharge resistance R1, can not carry out the equilibrium. When the balancing instruction received by the switching device K1 is to start balancing, the switching device K1 is turned on, and at this time, if the voltage of the battery cell B1 is higher than the voltage stabilizing value of the voltage stabilizing device ZV, the voltage stabilizing device ZV is turned on, the whole loop of the balancing failure protection circuit is turned on, and the battery cell B1 discharges through the resistor R1 to consume energy to complete balancing.
In the balancing process, if the battery management chip fails to control or the switching device K1 fails, the switching device K1 is continuously in a conducting state, when the battery cell B1 discharges and the voltage is reduced to the voltage stabilizing value of the voltage stabilizing device ZV, the voltage stabilizing device ZV does not have a conducting condition at this time, and the voltage stabilizing device ZV is closed, so that the battery cell B1 can be prevented from further discharging, and the battery cell B1 is prevented from over-discharging.
In a possible implementation manner, the voltage regulator device ZV may include at least one voltage regulator diode, and the embodiment is described by taking as an example that the equalization failure protection circuit is provided with a voltage regulator diode, wherein a cathode of the voltage regulator diode is electrically connected to a second end of the resistor R1, a first end of the resistor R1 is electrically connected to an anode of the cell B1, which is equivalent to electrically connecting the cathode of the voltage regulator diode to an anode of the cell B1, and by utilizing a reverse breakdown characteristic of the voltage regulator diode, when a reverse voltage is lower than a breakdown voltage of the voltage regulator diode, the breakdown voltage is a voltage regulation value of the voltage regulator diode, the reverse voltage is a voltage of the cell B1, when a voltage of the cell B1 is lower than the voltage regulation value, the voltage regulator diode is not turned on, the cell B1 does not continue to discharge, when the reverse voltage is higher than the breakdown voltage, that is, the voltage of the cell B1 is, cell B1 may be discharged for equalization.
Through the voltage stabilizing characteristic of the voltage stabilizing diode, the voltage of the battery core B1 can be kept in a reasonable state, for example, the voltage stabilizing diode with the voltage stabilizing value equal to or higher than the lowest working voltage of the battery core B1 is selected, the voltage of the battery core B1 can be ensured not to be lower than the lowest working voltage, and the battery core B1 or the whole battery can not work normally due to the fact that the voltage of the battery core B1 is too low.
The balanced failure protection circuit that this application embodiment provided, through increase zener diode in the discharge circuit of electricity core B1, wherein zener diode's steady voltage value is not less than the minimum operating voltage of electricity core B1, when electricity core B1 voltage drops to being less than zener diode's steady voltage value, zener diode in time cuts off, prevents that electricity core B1 voltage from dropping to below the minimum operating voltage. The equalization failure protection circuit provided by this embodiment can enable the battery cell B1 to complete passive equalization under the control of the battery management chip, and can also prevent the battery cell B1 from over-discharging.
In another possible implementation manner, the battery management chip judges whether a certain battery cell needs to be balanced by collecting the voltage of each battery cell. And when the battery cell needs to be balanced, outputting an instruction to a balancing circuit corresponding to the battery cell through a corresponding port for balancing. For example, for the cell B1, the battery management chip is electrically connected to the positive electrode of the cell B1 through the VB1 port, the VB0 port is electrically connected to the negative electrode of the cell B1 to acquire the voltage thereof, and the balancing instruction is output through the BL1 port. In the battery management chip, a BL1 port outputs signals through a MOS complementary switch, and during equalization, the MOS complementary switch enables a BL1 port to be communicated with a VB1 port, and V isBL1＝VVB1I.e. equalizing the voltage of the command signal with the cellThe voltages are consistent, so that in addition to the voltage stabilizing device arranged in the discharge loop of the battery cell, the over-discharge of the battery cell can be limited by arranging the voltage stabilizing device on the control end of the switching device. Referring to fig. 4, fig. 4 is a circuit diagram illustrating another equalizing failure protection circuit according to an embodiment of the present disclosure.
The balanced failure protection circuit that this application embodiment provided includes resistance R1, switching device K1 and regulator device ZV, and regulator device ZV sets up between control end and battery management chip. The resistor R1 and the switching device K1 are connected in series and then connected in parallel at two ends of the positive electrode and the negative electrode of the battery cell B1, the switching device K1 can be one or a combination of a field effect transistor, a thyristor and a transistor, the switching device K1 comprises a control end, the switching device K1 can be switched on or switched off according to a signal received by the control end, the control end of the switching device K1 is connected in series with the voltage stabilizing device ZV and then electrically connected with the battery management chip, specifically, the control end is electrically connected with the first end of the voltage stabilizing device ZV, and the second end of the voltage stabilizing device ZV is electrically connected with the BL port of the battery management chip. The battery management chip sends a balancing instruction to the control end of the switching device K1 through the voltage stabilizing device ZV.
The equalization instruction comprises starting equalization and stopping equalization, when the equalization instruction received by the switching device K1 is the instruction for starting equalization, namely the instruction for controlling the switching device K1 to be conducted, because the signal voltage of the equalization instruction is equal to the voltage of the battery cell B1, if the signal voltage of the equalization instruction is higher than the voltage stabilizing value of the voltage stabilizing device ZV, the voltage stabilizing device ZV is conducted, the switching device K1 can receive the instruction for starting equalization, at the moment, the switching device K1 is conducted, and the battery cell B1 conducts equalization by discharging to the resistor R1.
If the battery management chip fails to control, the start equalization signal is continuously output, and the switching device K1 is continuously in the on state, which may cause the over-discharge of the battery cell B1, but due to the existence of the voltage stabilizing device ZV, when the voltage of the battery cell B1 drops to the voltage stabilizing value, that is, when the voltage of the equalization instruction signal drops to the voltage stabilizing value, the voltage stabilizing device ZV is not turned on, at this time, the switching device K1 does not receive the start equalization instruction, the switching device K1 is in the off state, and the battery cell B1 may not continue to discharge.
If the balancing instruction received by the switching device K1 is an instruction for stopping balancing, that is, the balancing instruction is an instruction for controlling the switching device K1 to be switched off, at this time, if the voltage of the battery cell B1 is lower than the voltage stabilization value, the voltage stabilization device ZV is not switched on, and the switching device K1 does not receive the control signal and is in a switched-off state; if the voltage of the battery cell B1 is higher than the voltage stabilization value, the voltage stabilization device ZV is switched on, the switching device K1 receives the balancing stopping instruction and is in a disconnected state, and the battery cell B1 does not continue to discharge. Through setting up voltage regulator device ZV at switching device K1's control end, no matter battery B1 voltage is in what kind of level, finally can not be less than voltage regulator device ZV's steady voltage value, can prevent effectively that battery B1 from overdischarging.
In a possible implementation, the voltage regulator device ZV may include at least one voltage regulator diode, and the embodiment is described by taking as an example that the equalization failure protection circuit is provided with one voltage regulator diode, wherein an anode of the voltage regulator diode is electrically connected to the control terminal of the switching device K1, and a cathode of the voltage regulator diode is electrically connected to the BL port of the battery management chip. By utilizing the reverse conduction characteristic of the voltage regulator diode, when the voltage of the signal output by the battery management chip BL port is higher than the breakdown voltage, that is, the cell B1 is conducted when the voltage is higher than the voltage regulation value of the voltage regulator diode, so that the cell B1 can perform discharge equalization. Through the voltage stabilizing characteristic of the voltage stabilizing diode, the voltage of the battery core B1 can be kept in a reasonable state, for example, the voltage stabilizing diode with the voltage stabilizing value equal to or higher than the lowest working voltage of the battery core B1 is selected, the voltage of the battery core B1 can be ensured not to be lower than the lowest working voltage, and the battery core B1 or the whole battery can not work normally due to the fact that the voltage of the battery core B1 is too low.
The balanced failure protection circuit that this application embodiment provided, through add zener diode at switching device K1's control end, zener diode's steady voltage value is not less than the minimum operating voltage of electricity core B1, and when electricity core B1 voltage dropped to being less than zener diode's steady voltage value, zener diode in time cuts off, prevents that electricity core B1 voltage from dropping to below the minimum operating voltage. The equalization failure protection circuit provided by this embodiment can enable the battery cell B1 to complete passive equalization under the control of the battery management chip, and can also prevent the battery cell B1 from over-discharging.
On the basis of fig. 3 and fig. 4, referring to fig. 5, an embodiment of the present application further provides another equalization failure protection circuit, where a voltage regulator device is simultaneously disposed at a control end of a switchable device in a discharge loop of a battery cell, so as to form protection redundancy, and prevent the battery cell from being over-discharged due to equalization failure or failure of the switching device.
As shown in fig. 5, the equalization failure protection circuit provided in the embodiment of the present application includes a resistor R1, a switching device K1, a first zener diode ZV1, and a second zener diode ZV2, where the resistor R1 and the first zener diode ZV1 are connected in series and then disposed between the positive electrode of the cell B1 and the switching device K1, the resistor R1 includes a first end and a second end, the first end of the resistor R1 is electrically connected to the positive electrode of the cell B1, the second end of the resistor R1 is electrically connected to the negative electrode of the first zener diode ZV1, the positive electrode of the first zener diode ZV1 is electrically connected to the switching device K1, the positive electrode of the second zener diode ZV2 is electrically connected to the control end of the switching device K1, and the negative electrode of the second zener diode ZV2 is electrically connected to the BL port of the battery management chip. The first zener diode ZV1 and the second zener diode ZV2 may be the same zener diode, and their voltage regulation values are greater than or equal to the lowest operating voltage of the battery cell B1.
On one hand, the first zener diode ZV1 is arranged in the discharge loop of the cell B1, when the voltage of the cell B1 is lower than the regulated voltage of the first zener diode ZV1, the first zener diode ZV1 is turned off, the discharge loop is not turned on, and the over-discharge of the cell B1 can be effectively avoided, on the other hand, since the voltage output to the control end by the battery management chip is consistent with the voltage of the cell B1, when the voltage of the cell B1 is lower than the regulated voltage of the second zener diode ZV2, the second zener diode ZV2 is also turned off, the switching device K1 is not subjected to the signal of the battery management chip, the off state is maintained, and the over-discharge of the cell B1 caused by the failure of the battery management chip can be prevented, by simultaneously arranging the first zener diode ZV1 and the second zener diode ZV2, the over-discharge protection is arranged at the control ends of the discharge loop of the cell B1 and the switching device K1, so as to form a redundant cell 1, the reliability of the battery cell B1 and the battery is increased.
It should be noted that, in the above embodiments, the voltage regulator devices are all exemplified by the voltage regulator diodes, but the voltage regulator devices are not limited thereto, and besides the voltage regulator diodes, the voltage regulator devices may also be other devices having the same or similar functions, for example, other devices having reasonable conduction voltage drops.
The embodiment of the application further provides a battery, which comprises a battery management system, a plurality of battery cells and the balance failure protection circuits provided by the plurality of the above embodiments, wherein the battery management system comprises a battery management chip, the battery management chip is electrically connected with each battery cell, and each battery cell is correspondingly provided with one balance failure protection circuit to prevent the battery cells from being over-discharged during balance.
The embodiment of the application further provides a battery pack, wherein the battery pack comprises a battery management system, a plurality of battery monomers and the balance failure protection circuit provided by the above embodiments, the battery management system comprises a battery management chip, the battery management chip is electrically connected with each battery monomer, and each battery monomer is correspondingly provided with one balance failure protection circuit to prevent the over-discharge of the battery during passive balance.
To sum up, the utility model provides a balanced fail safe circuit, battery and group battery through add the voltage regulator device in equalizer circuit, when electric core voltage discharges to the steady voltage value of voltage regulator device, the voltage regulator device can break off promptly, avoids electric core to cross to put, even balanced control inefficacy or switch failure, because the voltage stabilization performance of voltage regulator device self also can in time turn-offs the return circuit, prevents that electric core from crossing to put.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The equalization failure protection circuit is characterized by comprising a resistor, a switching device and a voltage stabilizing device; the switching device comprises a control terminal;
the resistor is connected with the switching device in series and then connected to two ends of the battery cell in parallel; the control end is used for being electrically connected with the battery management chip;
the control end is used for receiving a balancing instruction of the battery management chip;
the switch device is used for changing the on-off state according to the balancing instruction of the battery management chip so as to balance the battery core;
the voltage stabilizing device is used for conducting when the on-off state of the switch device is a conducting state and the voltage of the battery cell is higher than a voltage stabilizing value of the voltage stabilizing device so as to enable the battery cell to discharge to realize balance;
the voltage stabilizing device is also used for switching off when the cell voltage is lower than a voltage stabilizing value so as to prevent the over-discharge of the cell.
2. The balanced failure protection circuit according to claim 1, wherein the voltage regulator device is disposed between the switching device and the battery cell;
when the switching device switches the on-off state to the on-state according to the balancing instruction, the voltage stabilizing device is used for conducting when the cell voltage is higher than the voltage stabilizing value so as to balance the cell.
3. The balanced failure protection circuit according to claim 2, wherein the voltage regulator device is a voltage regulator diode, a negative electrode of the voltage regulator diode is electrically connected with a positive electrode of the battery cell after being connected with the resistor in series, and a positive electrode of the voltage regulator diode is electrically connected with the switch device.
4. The equalization failure protection circuit according to claim 1, wherein the voltage regulator device is disposed between the control terminal and the battery management chip, and the battery management chip sends an equalization instruction signal to the control terminal through the voltage regulator device; the voltage of the equalization instruction signal is consistent with the cell voltage;
the voltage stabilizing device is used for conducting when the voltage of the equalization instruction signal exceeds the voltage stabilizing value so as to equalize the battery cell;
the voltage stabilizing device is further used for switching off when the voltage of the equalization instruction signal is lower than the voltage stabilizing value so as to prevent the battery core from being over-discharged.
5. The protection circuit of claim 4, wherein the voltage regulator device is a voltage regulator diode, a negative electrode of the voltage regulator diode is electrically connected to the battery management chip, and a positive electrode of the voltage regulator diode is electrically connected to the control terminal of the switching device.
6. The equalizer failure protection circuit of claim 1, wherein the voltage regulator device comprises a first voltage regulator diode and a second voltage regulator diode,
the negative electrode of the first voltage stabilizing diode is electrically connected with the positive electrode of the battery cell after being connected with the resistor in series, and the positive electrode of the first voltage stabilizing diode is electrically connected with the switching device;
and the cathode of the second voltage stabilizing diode is electrically connected with the battery management chip, and the anode of the second voltage stabilizing diode is electrically connected with the control end of the switching device.
7. The balanced failure protection circuit according to any one of claims 1 to 6, wherein the regulated voltage value of the voltage regulator device is greater than or equal to the lowest operating voltage of the battery cell.
8. The equalization failure protection circuit of claim 1 wherein the switching device comprises one of a field effect transistor, a thyristor, a transistor, or a combination thereof.
9. A battery, characterized in that, the battery includes a battery management chip, a plurality of electric cores and a plurality of equalizing failure protection circuits according to any one of claims 1 to 8, the battery management chip is electrically connected with the electric cores, and each electric core is correspondingly provided with one equalizing failure protection circuit.
10. A battery pack is characterized by comprising a battery management chip, a plurality of batteries and a plurality of balance failure protection circuits according to any one of claims 1 to 8, wherein the battery management chip is electrically connected with the batteries, and one balance failure protection circuit is arranged corresponding to each battery.
CN201921518425.6U 2019-09-11 2019-09-11 Balanced failure protection circuit, battery and battery pack Active CN210404724U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921518425.6U CN210404724U (en) 2019-09-11 2019-09-11 Balanced failure protection circuit, battery and battery pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921518425.6U CN210404724U (en) 2019-09-11 2019-09-11 Balanced failure protection circuit, battery and battery pack

Publications (1)

Publication Number Publication Date
CN210404724U true CN210404724U (en) 2020-04-24

Family

ID=70341767

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921518425.6U Active CN210404724U (en) 2019-09-11 2019-09-11 Balanced failure protection circuit, battery and battery pack

Country Status (1)

Country Link
CN (1) CN210404724U (en)

Similar Documents

Publication Publication Date Title
US7928691B2 (en) Method and system for cell equalization with isolated charging sources
EP2186181B1 (en) Apparatus and method for balancing of battery cell's charge capacity
US7825629B2 (en) Method and system for cell equalization with charging sources and shunt regulators
US9013148B2 (en) Lithium-ion battery pack and method of charge/discharge equalizing
US7821230B2 (en) Method and system for cell equalization with switched charging sources
US9643506B2 (en) Portable backup charger
US10326288B2 (en) Method and device for the voltage-controlled self-deactivation of electronic components or battery cells
CN115208005A (en) Battery system
US20120001640A1 (en) Power supply device capable of detecting disconnection of ground line
KR20110134751A (en) A battery pack and method for controlling the battery pack
US20110193527A1 (en) Lithium Battery Module
CN101582517A (en) Charging and discharging battery pack and control method thereof
JP2013162597A (en) Assembled battery discharge control system and assembled battery discharge control method
KR20150107032A (en) Battery pack
JP2010272219A (en) Charge control device for lithium ion battery pack, and lithium ion battery pack system
CN209805465U (en) Storage battery pack topological structure capable of prolonging service life of storage battery
KR20180035080A (en) Battery cell balancing circuit
JP2002058170A (en) Uninterruptible power supply
JP3249261B2 (en) Battery pack
JP2001112182A (en) Protective circuit for secondary battery
CN206099397U (en) Moving equilibrium self -adaptation voltage detection circuit
KR102222119B1 (en) battery pack
CN210404724U (en) Balanced failure protection circuit, battery and battery pack
JP2004229391A (en) Battery pack
CN110444824B (en) Battery pack structure reconstruction device and method

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 510000 Block C, 115 Gaopu Road, Tianhe District, Guangzhou City, Guangdong Province

Patentee after: Guangzhou Jifei Technology Co.,Ltd.

Address before: 510000 Block C, 115 Gaopu Road, Tianhe District, Guangzhou City, Guangdong Province

Patentee before: Guangzhou Xaircraft Technology Co.,Ltd.