CN217362566U - Battery protection circuit and lithium battery protection board - Google Patents
Battery protection circuit and lithium battery protection board Download PDFInfo
- Publication number
- CN217362566U CN217362566U CN202220855271.5U CN202220855271U CN217362566U CN 217362566 U CN217362566 U CN 217362566U CN 202220855271 U CN202220855271 U CN 202220855271U CN 217362566 U CN217362566 U CN 217362566U
- Authority
- CN
- China
- Prior art keywords
- circuit
- battery
- resistor
- protection circuit
- signal
- 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
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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a battery protection circuit and lithium battery protection board, this battery protection circuit includes: the circuit comprises a voltage division circuit, a signal generation circuit, a driving circuit and a protection circuit. The voltage dividing circuit generates a voltage change signal according to external temperature change and provides the voltage change signal for the signal generating circuit, when the voltage change signal received by the signal generating circuit is higher than a threshold value, a high level signal is output to the driving circuit, the driving circuit receives the high level signal and controls the action of the protection circuit, and therefore the battery to be monitored connected with the protection circuit is short-circuited to the ground, and over-temperature protection of the battery is achieved. Therefore, the embodiment of the utility model provides a battery protection circuit realizes battery excess temperature protection through independent hardware circuit module, can not influence battery main circuit work when breaking down, has avoided the risk that software became invalid simultaneously, makes battery excess temperature protection safer, more reliable.
Description
Technical Field
The utility model belongs to the technical field of power electronics, concretely relates to battery protection circuit and lithium cell protection shield.
Background
With the development of lithium battery technology, lithium batteries are more and more widely concerned in practical application, so that effective protection of the lithium batteries is natural for the safety and the service life of the batteries, and at the moment, a lithium battery protection board is also one of very core components in a battery pack and mainly plays a role in protecting the charging and discharging of a series lithium battery pack.
At present, the lithium battery protection board is mainly designed to realize overcharge protection, overdischarge protection, over-temperature protection, overcurrent protection, short-circuit protection and the like. Meanwhile, when the specific protection is realized, the protection is realized by combining common software and hardware.
Among the protection functions that can be realized by the lithium battery protection board, the over-temperature protection is generally integrated in an electricity meter chip or a primary control chip. An over-temperature secondary protection function is not designed, or secondary temperature protection is realized by only monitoring the temperature by using software, so that the probability of software failure is high in the using process, and the use of the lithium battery is dangerous.
Disclosure of Invention
In view of this, the embodiment of the utility model provides a battery protection circuit and lithium battery protection shield to adopt the technical problem that software became invalid easily in solving the design of prior art thermal monitoring protection circuit.
The utility model provides a technical scheme as follows:
the embodiment of the utility model provides a first aspect provides a battery protection circuit, and this battery protection circuit includes: bleeder circuit, signal generation circuit, drive circuit and protection circuit that connect gradually, partial pressure voltage receives the change of outside temperature and generates the voltage change signal, will the voltage change signal output extremely signal generation circuit, signal generation circuit receives when the voltage change signal is higher than the voltage threshold, output high level signal extremely drive circuit, drive circuit basis high level signal control protection circuit action for with the battery to be monitored that protection circuit is connected shorts with to the ground.
Optionally, the voltage divider circuit includes: the signal generating circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is connected with one end of the second resistor and the input end of the signal generating circuit, the other end of the first resistor is grounded, and the other end of the second resistor is connected with an external power supply.
Optionally, the first resistor is a thermistor that receives external temperature changes.
Optionally, the signal generating circuit comprises: the input end of the trigger is connected with one end of the first resistor and one end of the second resistor, and the output end of the trigger is connected with the output end of the signal generating circuit; when the first resistor is a positive temperature coefficient thermistor, the trigger is a Schmitt trigger, and when the first resistor is a negative temperature coefficient thermistor, the trigger is an inverse Schmitt trigger.
Optionally, the signal generating circuit comprises: the non-inverting input end of the comparator is connected with the output end of the voltage division circuit, the inverting input end of the comparator is connected with an external power supply and receives an externally input voltage threshold, and the output end of the comparator is connected with the output end of the signal generation circuit.
Optionally, the driving circuit comprises: the grid electrode of the triode is connected with one end of the third resistor and the output end of the signal generating circuit, the source electrode of the triode is connected with the other end of the third resistor and is grounded, and the drain electrode of the triode is connected with the output end of the driving circuit.
Optionally, the protection circuit comprises: and the resistance end of the three-terminal fuse is connected with the output end of the driving circuit, and two fusing ends of the three-terminal fuse are respectively connected with the positive electrode of the battery cell of the battery to be monitored and the positive electrode of the output end of the battery to be monitored.
The embodiment of the utility model provides a second aspect provides a lithium battery protection board, this lithium battery protection board includes the embodiment of the utility model provides a first aspect and any one of the first aspect battery protection circuit.
The utility model discloses technical scheme has following advantage:
the embodiment of the utility model provides a battery protection circuit sets up bleeder circuit, signal generation circuit, drive circuit and protection circuit, and bleeder circuit generates the voltage variation signal according to the external temperature change to for the signal generation circuit provides the voltage variation signal, when the voltage variation signal that signal generation circuit received is higher than the threshold value, output high level signal to drive circuit, drive circuit received high level signal, control protection circuit action, make with what protection circuit connected waits to monitor the battery and to ground short circuit, thereby realize the protection of battery excess temperature. Therefore, the embodiment of the utility model provides a battery protection circuit realizes battery excess temperature protection through independent hardware circuit module, can not influence battery main circuit work when breaking down, has avoided the risk of software inefficacy simultaneously, makes battery excess temperature protection safer, more reliable.
The embodiment of the utility model provides a lithium battery protection board adopts the battery protection circuit who has contained bleeder circuit, signal generation circuit, drive circuit and protection circuit, adopts independent hardware module and other circuit board to keep apart promptly, does not receive the restriction of other circuit layouts, can not influence battery charge-discharge performance simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a battery protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structure of a battery protection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be connected through the inside of the two elements, or may be connected wirelessly or through a wire. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides a battery protection circuit, as shown in fig. 1, this battery protection circuit includes: the temperature control circuit comprises a voltage division circuit 1, a signal generation circuit 2, a driving circuit 3 and a protection circuit 4, wherein the voltage division circuit 1 is connected with the signal generation circuit 2 and used for generating a voltage change signal according to external temperature change and providing the voltage change signal for the signal generation circuit 2; the signal generating circuit 2 is connected with the driving circuit 3, and outputs a high-level signal to the driving circuit 3 when the voltage change signal received by the signal generating circuit 2 is higher than a threshold value; the driving circuit 3 is connected with the protection circuit 4, and when the driving circuit 3 receives a high level signal, the protection circuit 4 is controlled to act, so that the battery to be monitored connected with the protection circuit is short-circuited to the ground, and the over-temperature protection of the battery is realized.
The embodiment of the utility model provides a battery protection circuit sets up bleeder circuit, signal generation circuit, drive circuit and protection circuit, and bleeder circuit generates the voltage change signal according to the change of external temperature to for signal generation circuit provides the voltage change signal, when the voltage change signal that signal generation circuit received is higher than the threshold value, output high level signal to drive circuit, drive circuit received high level signal, control protection circuit action, make with what protection circuit connected waits to monitor the battery short circuit to ground, thereby realize the battery overtemperature prote protection. Therefore, the embodiment of the utility model provides a battery protection circuit realizes battery excess temperature protection through independent hardware circuit module, can not influence battery main circuit work when breaking down, has avoided the risk of software inefficacy simultaneously, makes battery excess temperature protection safer, more reliable.
In the embodiment of the present invention, as shown in fig. 2, the voltage dividing circuit 1 includes: the circuit comprises a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is connected with one end of the second resistor R2 and the input end of the signal generating circuit 2, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 is connected with an external power supply.
The first resistor R1 is a PTC thermistor, the internal resistance of the PTC thermistor is increased along with the increase of temperature, the resistance value is 10K omega, and the type is Murata PRF15BB103RB6 RC; in addition, the first resistor can also be selected as an NTC thermistor of which the resistance value decreases with increasing temperature. The embodiment of the utility model provides a do not do the injecive to the concrete lectotype of first resistance, select can based on actual conditions. The resistance of the second resistor R2 is 715K Ω, the second resistor and the first resistor R1 are connected in series to form a voltage dividing circuit, and through serial voltage division, when the temperature rises, the resistance of the first resistor R1 becomes large, and the voltage applied to the first resistor R1 also becomes large. Therefore, when the temperature exceeds the threshold value, the voltage change signal generated by the voltage division circuit also exceeds the threshold value.
In the embodiment of the present invention, as shown in fig. 2, the signal generating circuit 2 includes: the comparator, the homophase input end of comparator is connected bleeder circuit's output, when bleeder circuit includes first resistance and second resistance, the homophase input end of comparator connects the one end of first resistance and the one end of second resistance, the external power source is connected to the inverting input end of comparator, receives external input's voltage threshold, the output of comparator is connected signal generation circuit's output. The comparator compares the voltage change signal output by the voltage division circuit with a voltage threshold value, and outputs a high level signal when the voltage change signal is higher than the voltage threshold value. Wherein, the model of this comparator can select any one kind of comparator that has now, the embodiment of the utility model provides a do not restrict to this.
Although the comparator is adopted as the signal generating circuit, signal comparison can be realized, the anti-interference capability of the comparator is poor, noise can cause unstable output level, and the problems of level mutation and the like exist. In order to solve the problem, a trigger can be used as a signal generating circuit, so that the anti-interference capability of the circuit is improved.
When the trigger is used as the signal generating circuit, the trigger may be a schmitt trigger or an inverted schmitt trigger. When the first resistor adopts a PTC thermistor, the trigger selects a Schmitt trigger; when the first resistor adopts an NTC thermistor, the trigger selects an inverse Schmitt trigger. The trigger has the same function as the comparator and realizes the comparison of voltage.
Specifically, taking a schmitt trigger as an example of the trigger, a pin a of the trigger U1 is an input terminal for receiving a voltage change signal input by the voltage divider circuit 1, that is, the input terminal is connected to one end of the first resistor and one end of the second resistor, a pin Y of the trigger U1 is an output terminal for outputting a high level signal, VCC of a pin U1 of the trigger is a power supply terminal, an external power supply is connected to supply power to the trigger U1, a trigger threshold voltage of the trigger U1 is obtained according to the supply voltage, a pin GND of the trigger U1 is a ground terminal, and a pin NC represents a pin that is not connected. When the Schmitt trigger is adopted, the SN74AUPIG17 type trigger can be selected, and the high-level output time can reach 3ns to 5 ns.
In the embodiment of the present invention, as shown in fig. 2, the driving circuit 3 includes: the triode Q1 and the third resistor R3, the grid G of the triode Q1 is connected with one end of the third resistor R3 and the output end of the signal generating circuit 2, the source S of the triode Q1 is connected with the other end of the third resistor R3 and is grounded, and the drain D of the triode Q1 is connected with the output end of the driving circuit 3.
The third resistor R3 is selected to have a resistance value of 100 Komega and a model of YAGEO RC0402 JX-XX 100KL, the third resistor R3 is used as a pull-down resistor, and when the third resistor R3 is connected with a triode for use, the gate voltage of the triode Q1 can be pulled to 0V, so that the triode Q1 cannot be automatically conducted when being turned off; receive the high level signal back source S and the drain electrode D of signal generation circuit 2 input when triode Q1 and switch on, specifically, triode Q1 can select the triode of Alpha & Omega AON 2408-IRHS 6242PBF model, the utility model discloses do not restrict the concrete model of triode, as long as can realize corresponding function can.
In the embodiment of the present invention, as shown in fig. 2, the protection circuit 4 includes: and the resistance end of the three-terminal fuse F400 is connected with the output end of the driving circuit 3, and two fusing ends of the three-terminal fuse F400 are respectively connected with the positive electrode of the battery cell of the battery to be monitored and the positive electrode of the output end of the battery to be monitored.
The three-terminal fuse F400 is selected from SONY SFH-1215P, SONYSFH-1215B, and Cyntec FB-5432-15A-C3C-C. After triode Q1 source S and drain D switched on, three-terminal fuse F400 was pulled down, and the positive circuit of battery waiting to monitor appears the short circuit to ground through three-terminal fuse F400 pull down, and the short-circuit current flows through three-terminal fuse F400, makes three-terminal fuse F400 fuse, has cut off the circuit between waiting to monitor battery electric core positive pole and the battery output positive pole of waiting to monitor, and the outside can not reuse electric core charge or discharge, has played the effect of protection battery.
The embodiment of the utility model provides a still provide a lithium battery protection board, this lithium battery protection board include above-mentioned embodiment battery protection circuit.
The embodiment of the utility model provides a lithium battery protection board adopts the battery protection circuit who has contained bleeder circuit 1, signal generation circuit 2, drive circuit 3 and protection circuit 4, adopts independent hardware module and other circuit boards to keep apart promptly, does not receive other circuit layout restrictions, can not influence battery charge-discharge performance simultaneously.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit of the invention and the scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (8)
1. A battery protection circuit, comprising: a voltage division circuit, a signal generation circuit, a drive circuit and a protection circuit which are connected in sequence,
the voltage dividing circuit receives external temperature change to generate a voltage change signal, the voltage change signal is output to the signal generating circuit, when the voltage change signal received by the signal generating circuit is higher than a voltage threshold value, a high level signal is output to the driving circuit, and the driving circuit controls the protection circuit to act according to the high level signal, so that a battery to be monitored, which is connected with the protection circuit, is short-circuited to the ground.
2. The battery protection circuit of claim 1, wherein the voltage divider circuit comprises: a first resistance and a second resistance, wherein the first resistance and the second resistance are connected,
one end of the first resistor is connected with one end of the second resistor and the input end of the signal generating circuit, the other end of the first resistor is grounded, and the other end of the second resistor is connected with an external power supply.
3. The battery protection circuit of claim 2, wherein the first resistor is a thermistor that receives external temperature changes.
4. The battery protection circuit of claim 3, wherein the signal generation circuit comprises: the input end of the trigger is connected with one end of the first resistor and one end of the second resistor, and the output end of the trigger is connected with the output end of the signal generating circuit;
when the first resistor is a positive temperature coefficient thermistor, the trigger is a Schmitt trigger, and when the first resistor is a negative temperature coefficient thermistor, the trigger is an inverse Schmitt trigger.
5. The battery protection circuit of claim 1, wherein the signal generation circuit comprises: the non-inverting input end of the comparator is connected with the output end of the voltage division circuit, the inverting input end of the comparator is connected with an external power supply and receives an externally input voltage threshold, and the output end of the comparator is connected with the output end of the signal generation circuit.
6. The battery protection circuit of claim 1, wherein the drive circuit comprises: a triode and a third resistor, wherein the triode is connected with the third resistor,
the grid electrode of the triode is connected with one end of the third resistor and the output end of the signal generating circuit, the source electrode of the triode is connected with the other end of the third resistor and is grounded, and the drain electrode of the triode is connected with the output end of the driving circuit.
7. The battery protection circuit of claim 1, wherein the protection circuit comprises: a three-terminal fuse having a first terminal and a second terminal,
and the two fusing ends of the three-terminal fuse are respectively connected with the positive electrode of the electric core of the battery to be monitored and the positive electrode of the output end of the battery to be monitored.
8. A lithium battery protection sheet, comprising: the battery protection circuit of any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220855271.5U CN217362566U (en) | 2022-04-13 | 2022-04-13 | Battery protection circuit and lithium battery protection board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220855271.5U CN217362566U (en) | 2022-04-13 | 2022-04-13 | Battery protection circuit and lithium battery protection board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217362566U true CN217362566U (en) | 2022-09-02 |
Family
ID=83055856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220855271.5U Active CN217362566U (en) | 2022-04-13 | 2022-04-13 | Battery protection circuit and lithium battery protection board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217362566U (en) |
-
2022
- 2022-04-13 CN CN202220855271.5U patent/CN217362566U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101228651B (en) | Apparatus for protection of secondary battery | |
| JP6833984B2 (en) | Battery, terminal, and charging system | |
| JP5319224B2 (en) | Assembled battery system | |
| CN101103508B (en) | Method and apparatus for charging and discharging a rechargeable battery | |
| CN106329692B (en) | A kind of car emergency startup power supply and its start control method | |
| KR101387733B1 (en) | Battery pack, battery pack arrangement and electric apparatus | |
| US20200221780A1 (en) | Overheat protection circuit, electronic cigarette and electronic equipment | |
| JP2004135400A (en) | Secondary battery with protective circuit | |
| CN111600353A (en) | Lithium battery protection control ASIC chip system | |
| CN104362595A (en) | Battery pack power supply circuit capable of achieving over-temperature protection | |
| CN105098289A (en) | Safety battery pack structure capable of automatic temperature adjustment | |
| CN110112804A (en) | A kind of lithium battery and lead-acid battery universal charger | |
| CN217362566U (en) | Battery protection circuit and lithium battery protection board | |
| CN205489485U (en) | Solar charging power with control by temperature change, short circuit and overcharge protection | |
| CN101626153B (en) | Battery protection circuit and protection method thereof | |
| CN203910904U (en) | Power battery pack | |
| CN109391010A (en) | A kind of lithium battery high temperature automatic protection plate | |
| CN209938374U (en) | Lithium battery management protection circuit | |
| CN104241590B (en) | Accumulator list pond and for the method for accumulator list tank discharge | |
| CN203071566U (en) | Protection circuit of lithium battery pack | |
| CN219574334U (en) | Novel lithium battery function abnormality alarm circuit | |
| CN101635381B (en) | Power lithium-ion battery charging set provided with equalizing charge inside | |
| CN206077042U (en) | A kind of car emergency startup power supply | |
| CN220604758U (en) | Battery pack and vehicle | |
| CN220306972U (en) | Battery protection circuit and aerosol generating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |