CN215772607U - Secondary protection circuit of battery and battery - Google Patents
Secondary protection circuit of battery and battery Download PDFInfo
- Publication number
- CN215772607U CN215772607U CN202121932128.3U CN202121932128U CN215772607U CN 215772607 U CN215772607 U CN 215772607U CN 202121932128 U CN202121932128 U CN 202121932128U CN 215772607 U CN215772607 U CN 215772607U
- Authority
- CN
- China
- Prior art keywords
- circuit
- battery
- resistor
- protection circuit
- switch
- 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
Links
Images
Abstract
The embodiment of the application discloses a secondary protection circuit of a battery and the battery, wherein the battery comprises a battery core and a protection circuit, and the protection circuit comprises a first clamping circuit, a first voltage division circuit, a comparator and a fuse; one end of the first clamping circuit is connected with the positive electrode of the battery cell, the other end of the first clamping circuit is connected with one end of a first voltage division circuit through a first resistor, and the other end of the first voltage division circuit is connected with the negative electrode of the battery cell; and a first common node between the first resistor and the first voltage division circuit is connected with the input end of the comparator through a first switch first end, and the output end of the comparator is connected with the first end of the fuse through a second switch first end. The embodiment of the application is used for solving the technical problem that the failure rate of the battery pack is easily increased in the prior art.
Description
Technical Field
The embodiment of the utility model belongs to the technical field of battery protection, and particularly relates to a secondary protection circuit of a battery and the battery.
Background
The scheme of the secondary protection of the current mainstream battery management system mainly adopts the mode of monitoring overvoltage for each electricity-saving core to trigger the self-fusing of the three-terminal fuse, and the defects in the prior art are that when the electricity core is disconnected in an acquisition line or the electrical performance of the electricity core monomer is different after certain cycle of charging and discharging, the self-fusing of the fuse is easily triggered in advance by mistake when the abnormal conditions such as the floating of the charging voltage of the electricity core monomer are caused, and the fault rate of the battery pack is increased.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a secondary protection circuit for a battery, so as to solve the technical problem in the prior art that the failure rate of a battery pack is easily increased.
In a first aspect, to achieve the above object, the present application provides a secondary protection circuit for a battery, where the battery includes a battery cell and a protection circuit, and the protection circuit includes a first clamping circuit, a first voltage dividing circuit, a comparator, and a fuse;
one end of the first clamping circuit is connected with the positive electrode of the battery cell, the other end of the first clamping circuit is connected with one end of a first voltage division circuit through a first resistor, and the other end of the first voltage division circuit is connected with the negative electrode of the battery cell;
and a first common node between the first resistor and the first voltage division circuit is connected with the input end of the comparator through a first switch first end, and the output end of the comparator is connected with the first end of the fuse through a second switch first end.
As a preferred embodiment of the present application, the protection circuit further includes a compensation circuit;
the compensation circuit is arranged between the first resistor and the first voltage division circuit; or the compensation circuit is arranged between the first clamping circuit and the first resistor.
As a preferred embodiment of the present application, the compensation circuit includes a second resistor and a third resistor, and the second resistor and the third resistor are connected in parallel or in series; or the compensation circuit only comprises a second resistor or a third resistor, wherein the third resistor is a thermosensitive device.
As a preferred embodiment of the present application, the protection circuit further includes a first filter circuit, one end of the first filter circuit is connected to the first common node, and the other end of the first filter circuit is connected to the negative electrode of the battery cell.
As a preferred embodiment of the present application, the protection circuit further includes a fourth resistor, and the fourth resistor is disposed between the second end of the first switch and the positive electrode of the cell.
As a preferred embodiment of the present application, the protection circuit further includes a second clamping circuit, and the second clamping circuit is disposed between the third terminal of the first switch and the negative electrode of the battery cell.
As a preferred embodiment of the present application, the protection circuit further includes a first filter circuit, and the first filter circuit is disposed between the first common node and the battery cell negative electrode.
As a preferred embodiment of the present application, the protection circuit further includes a second filter circuit, and the second filter circuit is disposed between the input end of the comparator and the negative electrode of the battery cell.
As a preferred embodiment of the present application, the protection circuit further includes a delay circuit, one end of the delay circuit is connected to the output terminal of the comparator, and a second end of the delay circuit is connected to the first end of the second switch.
As a preferred embodiment of the present application, the second end of the fuse is connected to the positive electrode of the battery cell, and the third end of the fuse is connected to the positive electrode outgoing line of the battery.
Compared with the prior art, the secondary protection circuit of the battery realizes overcurrent and overvoltage protection by monitoring the total voltage of the electric core group, when the charging and discharging current is overlarge, the fuse can be directly fused, the charging and discharging circuit is disconnected, and the overcurrent protection is realized; when the battery pack is charged, the protection circuit can monitor the total voltage of the battery pack in real time, when the charging voltage is monitored to be overhigh and abnormal, the protection circuit can start monitoring delay to prevent false triggering of situations such as transient impact, if the duration time of the overhigh and abnormal charging voltage is longer than preset delay time, the protection circuit can start a fuse heating circuit to trigger fuse fusing, and therefore overvoltage protection is achieved.
In a second aspect, an embodiment of the present application provides a battery, including an electrical core and the protection circuit of the first aspect, the protection circuit is configured to perform overcurrent and overvoltage protection on the electrical core.
Compared with the prior art, the beneficial effects of the battery provided by the second aspect of the present application are the same as those of the first aspect, and are not described herein again.
Drawings
Fig. 1-7 are schematic structural diagrams of a secondary protection circuit of a battery according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Please add the key point, the circuit solves the problem of false triggering by what way.
As shown in fig. 1, the embodiment of the present application provides a schematic diagram of a secondary protection circuit of a battery of type 1, the method is used for solving the technical problems that the self-fusing of the fuse is easy to be triggered in advance and the failure rate of the battery pack is increased in the prior art, generally when the rated current of the battery cell is exceeded or the battery cell is normally discharged to cut-off voltage, under the abnormal conditions of continuous discharging and the like, the first protection circuit of the battery core is triggered to carry out primary protection, and the circuit of primary protection is recoverable, and the secondary protection circuit that this application embodiment provided is used for just taking effect after the primary protection became invalid, that is to say, can start the second protection circuit who is connected with electric core and realize the overcurrent and overvoltage protection of electric core, and the secondary protection of electric core is irreversible fusing, and it is the unable charged and discharged fault condition of battery entering under the prerequisite of guarantee safety, shows that the battery can't use.
In this embodiment, the battery includes a battery cell and a protection circuit, it should be noted that, in practical applications, the battery cell includes one or more battery cells, in this embodiment, a plurality of battery cells are shown, the protection circuit includes a first clamping circuit Z1, a first voltage dividing circuit R3, a comparator and a fuse, in this application, the first voltage dividing circuit R3 is implemented by a resistor, one end of the first clamping circuit Z1 is connected to the positive electrode of the battery cell V1-Vn, the other end of the first clamping circuit Z1 is connected to one end of the first voltage dividing circuit R3 by a first resistor R1, and the other end of the first voltage dividing circuit R3 is connected to the negative electrode of the battery cell V1-Vn; a first common node between the first resistor R1 and the first voltage-dividing circuit Z1 is connected to the input end of the comparator through a first end of a first switch T1, and the output end of the comparator is connected to a first end of a fuse through a first end of a second switch T2, in this embodiment, the first clamping circuit Z1 is a zener diode, wherein the first resistor R1 is a current-limiting resistor to avoid impact on the first switch T1 and the first clamping circuit Z1 when the rated current of the cell V1-Vn exceeds the rated current, the second end of the fuse is connected to the positive electrode of the cell V1-Vn, the third end of the fuse is connected to an outgoing line of the positive electrode of the battery, wherein the first switch T1 is a triode, and the second switch T2 is an MOS transistor,
in the above embodiment, the aforementioned cells V1-Vn sequentially pass through the first clamping circuit Z1, so that the input voltage clamp at the first end of the first switch T1 is located within the safety range corresponding to the output voltage of the cells, and since the voltage detected by the application is finally the voltage between the first end of the first switch T1, that is, the emitter of the first switch T1, and the cathodes of the cells V1-Vn, which is equivalent to the voltage at the two ends of the second clamping circuit Z2, and the corresponding relationship between the total voltage Vbat of the cells V1-Vn is: vz2 ═ R3/(R1+ R3) -VBE (voltage drop between emitter and base of transistor) (Vbat-Vz1), in this application, the first resistor R1 mainly functions to limit current, the second voltage dividing circuit R3 mainly functions to set the input impedance of the first switch T1, so as to avoid the first switch T1 from being turned on by interference when the cells V1-Vn are low voltage, actually, the second voltage dividing circuit R3 also functions as voltage division, that is, the factor R3/(R1+ R3) of the above formula, when R3> > R1, the factor is nearly equal to 1, and no voltage division is performed; when R3 is equivalent to R1, the effect of voltage division adjustment detection threshold value can be presented, the comparator is used for comparing the voltage input through the first switch T1 with the reference voltage, high and low levels are output, whether the second switch T2 is opened or not is determined according to the magnitude of the high and low levels, if the second switch T2 is opened, the fuse fuses, the battery enters a failure state that the battery cannot be charged and discharged, the battery cannot be used, and the technical problems that in the prior art, the fuse is easily triggered in advance by mistake, and the failure rate of the battery pack is increased can be solved through the secondary protection circuit.
The first switch T1 is used for linearly converting the total voltage V of the battery cells V1-VnbatTo low voltage V which can be detected convenientlyz2Meanwhile, the current amplification function is provided, the working current of a detection circuit or a detection chip is provided, so as to achieve the function of low power consumption, wherein the low power consumption means,when the voltage of the battery cell V1-Vn is too low, the first switch T1 is also in an off state due to the off-state of the first clamping circuit Z1, the first end of the first switch T1, i.e., the two ends of the second clamping circuit Z2, has no voltage, and the detection circuit or the chip V1-Vn therefore exhibits no power consumption.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a protection circuit of the type 2 according to an embodiment of the present application, in the power protection circuit provided in this embodiment, on the basis of fig. 1, the protection circuit further includes a compensation circuit, and the compensation circuit is configured to perform temperature compensation on the first clamping circuit Z1, so as to prevent an operating temperature of the first clamping circuit Z1 from operating within an appropriate temperature range.
The compensation circuit is arranged between the first resistor R1 and the first voltage division circuit R3; or the compensation circuit is arranged between the first clamping circuit Z1 and the first resistor R1.
In this embodiment, the compensation circuit includes a second resistor R2 and a third resistor NTC, and the second resistor R2 and the third resistor NTC are connected in parallel, and the second resistor R2 and the third resistor NTC may also be arranged in series, or the compensation circuit includes only the second resistor R2 or the third resistor NTC, and the third resistor NTC is a thermosensitive device and is a thermosensitive device with a negative temperature coefficient.
In the embodiment of the present application, the compensation circuit is added to balance the influence of temperature on the voltage drop of the first clamp circuit Z1, and generally, the voltage drop formula of the first clamp circuit Z1 is Vz1 ═ Vz1@25 ℃ (voltage tested at 25 degrees) + Tcoef (T-25); where Tcoef is the temperature coefficient in mv/c and T is the temperature c, i.e., the voltage of the first clamp Z1 varies with temperature.
In the present application, the first clamping circuit Z1 is a zener diode, and the zener diode temperature coefficient is positive, which is generally over 6V, that is, the first clamping circuit Z1 becomes larger with the temperature increase.
As shown in fig. 3, fig. 3 is a schematic structural diagram of a protection circuit of the 3 rd kind provided in this embodiment, in the power protection circuit provided in this embodiment, the protection circuit further includes a first filter circuit C1, one end of the first filter circuit C1 is connected to the first common node, the other end of the first filter circuit C1 is connected to a negative electrode of the battery cell V1-Vn, and in this embodiment, the first filter circuit C1 is a capacitor.
In the specific practical application of the circuit of this embodiment, the first filter circuit C1 has a low-pass filtering effect, and has a suppression effect on short-term high-frequency pulse interference.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a 4 th protection circuit provided in the embodiment of the present application, where the protection circuit further includes a fourth resistor R4, the fourth resistor R4 is disposed between the second end of the first switch T1 and the positive electrode of the battery cell V1-Vn, and in the embodiment of the present application, the fourth resistor is a resistor with a constant resistance of R4.
In the embodiment of the present application, the fourth resistor R4 can perform a voltage dividing function, that is, the voltage applied to the control terminal of the first switch T1 can be reduced, so as to avoid the occurrence of the situation of false triggering of the first switch T1. The fourth resistor R4 mainly functions to limit current, and a part of the fourth resistor R4 functions to limit current within a certain range, so as to avoid damage to a detection circuit or a chip when abnormal overcurrent occurs, so as to limit the output current of the first switch T1 within a certain range.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a protection circuit of the 5 th type provided in the embodiment of the present application, where the protection circuit further includes a second clamping circuit Z2, and the second clamping circuit Z2 is disposed between the third terminal of the first switch T1 and the negative electrode of the battery cell V1-Vn.
In this embodiment, the second clamping circuit Z2 can realize the input voltage of the control terminal of the first switch T1, and the second clamping circuit Z2 clamps the output voltage of the first switch T1.
As shown in fig. 6, fig. 6 is a schematic structural diagram of a protection circuit of the kind 6 provided in the embodiment of the present application, where the protection circuit further includes a second filter circuit C2, and the second filter circuit C2 is disposed between the input end of the comparator and the negative electrodes of the battery cells V1-Vn.
In the specific practical application of the circuit, the second filter circuit C1 has a low-pass filtering effect, and has a suppression effect on short-term high-frequency pulse interference. .
As shown in fig. 7, fig. 7 is a schematic structural diagram of a 7 th protection circuit provided in this embodiment of the present application, where the protection circuit further includes a delay circuit, one end of the delay circuit is connected to the output end of the comparator, and a second end of the delay circuit is connected to the first end of the second switch T2, and in this embodiment of the present application, the delay circuit includes a fifth resistor R5 and a third filter circuit C3, one end of the fifth resistor R5 is connected to the output end of the comparator, the third filter circuit C3 is disposed between the negative electrodes of the battery cells V1-Vn and a common end between the second end of the fifth resistor R5 and the second switch T2, where the second end of the second switch T2 is directly connected to the first end of the fuse, and the third end of the second switch T2 is connected to the negative electrodes of the battery cells V1-Vn.
In the specific practical application of the circuit of this embodiment, the delay filtering processing of the output voltage of the input comparator can be realized by the third filter circuit C3, so as to avoid the misoperation of the second switch, and the second filter circuit is a capacitor. The fifth resistor R5 and the third filter circuit C3 form a delay circuit, so as to suppress short-term high-frequency interference and further reduce the possibility of false triggering of the heating wire, wherein the delay is generally in the order of seconds, and the delay circuit of the application can also be replaced by a digital chip.
The fuse is three-terminal fuse in this application, and the first end of fuse links to each other with electric core anodal V1-Vn, and the fuse second end is connected with the first end of second switch, and the fuse third end links to each other with the anodal lead-out wire battery of battery, when overvoltage or overcurrent appear, then three-terminal fuse heater fuses the fuse, plays overvoltage and overcurrent protection's effect.
An embodiment of the present application provides a battery, including, electric core and the first aspect protection circuit, protection circuit be used for with the positive negative pole of electric core is in order to right electric core overcurrent and overvoltage protection.
Compared with the prior art, the beneficial effects of the battery provided by the second aspect of the present application are the same as those of the first aspect, and are not described herein again.
The application provides a secondary protection circuit of a battery and the battery, overcurrent and overvoltage protection are realized by monitoring the total voltage of a battery core group, when charging and discharging currents are too large, a fuse can be directly fused, and a charging and discharging circuit is disconnected, so that overcurrent protection is realized; when the battery pack is charged, the protection circuit can monitor the total voltage of the battery pack in real time, when the charging voltage is monitored to be overhigh and abnormal, the protection circuit can start monitoring delay to prevent false triggering of situations such as transient impact, if the duration time of the overhigh and abnormal charging voltage is longer than preset delay time, the protection circuit can start a fuse heating circuit to trigger fuse fusing, and therefore overvoltage protection is achieved.
Although the utility model has been described in detail herein with reference to specific embodiments and examples, it will be apparent to one skilled in the art that certain changes and modifications can be made therein without departing from the spirit and scope of the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.
Claims (10)
1. A secondary protection circuit of a battery is characterized in that the battery comprises a battery core and a protection circuit, wherein the protection circuit comprises a first clamping circuit, a first voltage division circuit, a comparator and a fuse;
one end of the first clamping circuit is connected with the positive electrode of the battery cell, the other end of the first clamping circuit is connected with one end of a first voltage division circuit through a first resistor, and the other end of the first voltage division circuit is connected with the negative electrode of the battery cell;
and a first common node between the first resistor and the first voltage division circuit is connected with the input end of the comparator through a first switch first end, and the output end of the comparator is connected with the first end of the fuse through a second switch first end.
2. The secondary protection circuit for a battery as claimed in claim 1, wherein the protection circuit further comprises a compensation circuit;
the compensation circuit is arranged between the first resistor and the first voltage division circuit; or the compensation circuit is arranged between the first clamping circuit and the first resistor.
3. The secondary protection circuit for a battery as claimed in claim 2, wherein the compensation circuit comprises a second resistor and a third resistor, and the second resistor and the third resistor are connected in parallel or in series; or the compensation circuit only comprises a second resistor or a third resistor, wherein the third resistor is a thermosensitive device.
4. The battery secondary protection circuit of claim 1, further comprising a first filter circuit, wherein one end of the first filter circuit is connected to the first common node, and the other end of the first filter circuit is connected to the negative electrode of the cell.
5. The battery secondary protection circuit of claim 4, wherein the protection circuit further comprises a fourth resistor, and the fourth resistor is disposed between the second end of the first switch and the positive electrode of the cell.
6. The battery secondary protection circuit of claim 1 or 5, wherein the protection circuit further comprises a second clamping circuit, and the second clamping circuit is disposed between the third terminal of the first switch and the negative electrode of the cell.
7. The battery protection circuit of claim 6, further comprising a second filter circuit disposed between the comparator input and the cell negative electrode.
8. The battery secondary protection circuit of claim 7, further comprising a delay circuit, wherein one end of the delay circuit is connected to the output terminal of the comparator, and a second end of the delay circuit is connected to the first end of the second switch.
9. The battery secondary protection circuit of claim 7, wherein the second end of the fuse is connected to the positive electrode of the battery cell, and the third end of the fuse is connected to the positive electrode lead-out wire of the battery.
10. A battery comprising a cell and a protection circuit according to any of claims 1 to 9 for over-current and over-voltage protection of the cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121932128.3U CN215772607U (en) | 2021-08-17 | 2021-08-17 | Secondary protection circuit of battery and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121932128.3U CN215772607U (en) | 2021-08-17 | 2021-08-17 | Secondary protection circuit of battery and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215772607U true CN215772607U (en) | 2022-02-08 |
Family
ID=80075709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121932128.3U Active CN215772607U (en) | 2021-08-17 | 2021-08-17 | Secondary protection circuit of battery and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215772607U (en) |
-
2021
- 2021-08-17 CN CN202121932128.3U patent/CN215772607U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103401224B (en) | A kind of multi-lithium-batterprotection protection system | |
| JP5289083B2 (en) | Secondary battery abnormality detection device and secondary battery device | |
| CN105098721B (en) | A kind of overvoltage crowbar and method of transverter submodule | |
| CN103199505B (en) | Output short-circuit protection circuit for high tension battery | |
| CN107979269B (en) | Overcurrent protection circuit | |
| TW201136082A (en) | Battery protection circuit, method and battery pack thereof | |
| CN105098933B (en) | A kind of battery cell collecting and detecting device | |
| CN112067876B (en) | Automatic reset residual voltage pulse hardware detection circuit | |
| CN102709901A (en) | Overvoltage protection method and device of current transformer | |
| CN112748367A (en) | Battery management system and detection method for battery disconnection fault | |
| KR20160125297A (en) | Battery device | |
| CN215772607U (en) | Secondary protection circuit of battery and battery | |
| EP2510598B1 (en) | Electronic protection circuit and protection device | |
| CN203859501U (en) | Battery pack discharge protection circuit and device | |
| CN2938522Y (en) | Overload protection circuit of power lithium ion battery | |
| CN116317013A (en) | Battery management system, battery management method, and battery disconnection detection system | |
| CN215646321U (en) | Formation and capacitance circuit, equipment and system | |
| JP2023535368A (en) | battery management system | |
| WO2022161275A1 (en) | Battery charging protection circuit and robot | |
| CN210350810U (en) | Power supply charging protection device | |
| CN210224996U (en) | UPS battery pack charging circuit protection device | |
| CN110265966A (en) | Overload and short-circuit protection circuit | |
| CN201260066Y (en) | Control circuit for multifunctional protection socket | |
| CN212323788U (en) | Voltage out-of-control multiple protection circuit of lithium battery pack charger | |
| CN114069567B (en) | Battery protection circuit and battery voltage sampling circuit thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |