CN217335160U - Dual lithium battery protection circuit - Google Patents
Dual lithium battery protection circuit Download PDFInfo
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- CN217335160U CN217335160U CN202220912356.2U CN202220912356U CN217335160U CN 217335160 U CN217335160 U CN 217335160U CN 202220912356 U CN202220912356 U CN 202220912356U CN 217335160 U CN217335160 U CN 217335160U
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The utility model discloses a dual lithium battery protection circuit, which comprises a charge-discharge interface, a main charge-discharge switch, a standby charge-discharge switch, a first relay switch and a charge-discharge protection chip, wherein the charge-discharge interface is used for connecting charging equipment or electric equipment; the main charge-discharge switch controls the charge and discharge of the lithium battery pack; the standby charge-discharge switch controls the charge and discharge of the lithium battery pack; the charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch fails, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack. When the main charge-discharge switch breaks down, the standby charge-discharge switch can be started to continue to provide charge-discharge protection control for the lithium battery pack. Therefore, maintenance cost of replacing the lithium battery pack protection circuit board is reduced. And on the other hand, the failure rate of the lithium battery pack is reduced.
Description
Technical Field
The utility model relates to a lithium battery protection technical field especially relates to a dual lithium battery protection circuit.
Background
In recent years, secondary batteries such as lithium (Li) ion batteries have been widely used. Lithium battery packs are widely used in battery cars, automobiles, and the like. In order to carry out charge and discharge protection on the lithium battery pack. Protection circuits are generally required to protect the charging and discharging of the lithium battery pack. The protection circuit is generally composed of a protection chip and a switch tube. Whether a short circuit occurs in a charge-discharge circuit or not and whether the lithium battery pack is overcharged or overdischarged or not are detected through the protection chip. When abnormal conditions such as short circuit, overcharge or overdischarge occur, the charge and discharge of the lithium battery pack are forbidden by controlling the switching tube to be cut off, and finally, the overcharge and overdischarge or overcurrent protection of the lithium battery pack is achieved.
However, the existing control switch tube is generally composed of one MOS tube, and the MOS tube may be damaged under the action of an abnormal pulse signal, so that the lithium battery pack cannot normally operate. The lithium battery protection circuit board needs to be replaced again. This results in high maintenance costs on the one hand. On the other hand, the problem of high failure rate of the lithium battery pack is caused.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a dual lithium battery protection circuit.
In order to achieve the above object, according to the utility model discloses dual lithium battery protection circuit, include:
the charging and discharging interface is used for connecting charging equipment or electric equipment;
the main charge and discharge switch is respectively connected with the charge and discharge interface and the lithium battery pack so as to control the charge and discharge of the lithium battery pack;
the standby charge and discharge switch is connected with the lithium battery pack so as to control the charge and discharge of the lithium battery pack;
the charge and discharge interface is also connected with the standby charge and discharge switch through the first relay switch;
the charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch fails, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack.
Further, according to an embodiment of the present invention, the first relay switch includes:
a first switch end of the relay K1 is connected with a positive end of the charge-discharge interface, a second switch end of the relay K1 is connected with a positive end of the lithium battery through the standby charge-discharge switch, and a first magnetic control end of the relay K1 is connected with a positive end B4+ of the lithium battery pack;
triode Q1, triode Q1's collecting electrode with relay K1's magnetic control second end is connected, triode Q1's projecting pole is connected with reference ground, triode Q1's base pass through resistance R12 with a control end of charge-discharge protection chip is connected, triode Q1's base still passes through resistance R13 and is connected with reference ground, the charge-discharge protection chip passes through triode Q1 is right the relay carries out switch drive control.
Further, according to an embodiment of the present invention, the first relay switch further includes:
a diode D1, wherein the anode of the diode D1 is connected with the second end of the relay K1, and the cathode of the diode D1 is connected with the first end of the relay K1; the off-time spike current of the relay K1 is released through the diode D1.
Further, according to an embodiment of the present invention, the first relay switch further includes:
the anode of the light emitting diode D2 is connected with the positive terminal B4+ of the lithium battery pack through a resistor R15, the cathode of the light emitting diode D2 is connected with the collector of the triode Q1, and the light emitting diode D2 is used for indicating the conducting state of the relay K1.
Further, according to the utility model discloses an embodiment, main charge-discharge switch includes:
a first discharge MOS switch M2, wherein the source of the first discharge MOS switch M2 is connected with the positive terminal of the positive terminal B4+ of the lithium battery pack, and the gate of the first discharge MOS switch M2 is connected with the discharge control terminal of the charge-discharge protection chip;
the charging protection circuit comprises a first charging MOS switch M1, wherein the drain electrode of the first charging MOS switch M1 is connected with the drain electrode of the first discharging MOS switch M2, the source electrode of the first charging MOS switch M1 is connected with the positive end of the charging and discharging interface, and the grid electrode of the first charging MOS switch M1 is connected with the charging control end of the charging and discharging protection chip.
Further, according to the utility model discloses an embodiment, reserve charge-discharge switch includes:
a second discharge MOS switch M4, a source of the second discharge MOS switch M4 is connected to the positive terminal of the lithium battery pack, and a gate of the second discharge MOS switch M4 is connected to a discharge control terminal of the charge and discharge protection chip;
a second charging MOS switch M3, a drain of the second charging MOS switch M3 is connected to a drain of the second discharging MOS switch M4, a source of the second charging MOS switch M3 is connected to a positive terminal of the charging and discharging interface through the first relay switch, and a gate of the second discharging MOS switch M4 is connected to a charging control terminal of the charging and discharging protection chip.
Further, according to the utility model discloses an embodiment, dual lithium battery protection circuit still includes:
and the first relay switch is connected with the standby charging and discharging switch through the first fuse TF1 so as to perform overcurrent protection on the standby charging and discharging loop.
Further, according to the utility model discloses an embodiment, dual lithium battery protection circuit still includes:
and the charge and discharge interface is connected with the main charge and discharge switch through the second fuse TF2 so as to perform overcurrent protection on the main charge and discharge loop.
Further, according to the utility model discloses an embodiment, dual lithium battery protection circuit still includes: the charge and discharge interface is also connected with the main charge and discharge switch through the second relay switch; the charge and discharge protection chip is also connected with the second relay switch to carry out on-off control on the second relay switch.
Further, according to the utility model discloses an embodiment, dual lithium battery protection circuit still includes:
the current detection resistor R14, the current detection resistor R14 with the charge-discharge protection chip is connected, the current detection resistor R14 sets up on the charge-discharge backward flow to current detection on the charge-discharge return circuit.
The embodiment of the utility model provides a dual lithium battery protection circuit is used for connecting charging equipment or consumer through the charge-discharge interface; the main charge-discharge switch controls the charge and discharge of the lithium battery pack; the standby charge-discharge switch controls the charge and discharge of the lithium battery pack; the charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch fails, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack. Because two lithium battery protection circuits are adopted. When the main charge-discharge switch breaks down, the standby charge-discharge switch can be started to continue to provide charge-discharge protection control for the lithium battery pack. Therefore, maintenance cost of replacing the lithium battery pack protection circuit board is reduced. And on the other hand, the failure rate of the lithium battery pack is reduced.
Drawings
Fig. 1 is a block diagram of a dual lithium battery protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a dual lithium battery protection circuit provided in an embodiment of the present invention;
fig. 3 is a block diagram of another dual lithium battery protection circuit according to an embodiment of the present invention.
Reference numerals:
the purpose of the present invention is to provide a portable electronic device, which can be easily and conveniently operated.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the technical scheme in the embodiment of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiment of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1 and 2, the utility model provides a dual lithium battery protection circuit, include: the charging and discharging protection circuit comprises a charging and discharging interface, a main charging and discharging switch, a standby charging and discharging switch, a first relay switch and a charging and discharging protection chip, wherein the charging and discharging interface is used for connecting charging equipment or electric equipment; the charging device can be connected through the charging and discharging interface, so that the lithium battery pack is charged through the charging device. Meanwhile, the charging and discharging interface can be connected with electric equipment so as to supply power to the electric equipment.
The main charge and discharge switch is respectively connected with the charge and discharge interface and the lithium battery pack so as to control the charge and discharge of the lithium battery pack; as shown in fig. 1, the main charge/discharge switch is disposed on a charge/discharge circuit loop of the lithium battery pack to perform on/off control of charging/discharging of the lithium battery pack.
The standby charge-discharge switch is connected with the lithium battery pack to control the charge and discharge of the lithium battery pack; that is, the charge and discharge loops of the lithium battery pack are arranged in two ways. In addition to the main circuit, a backup circuit is provided.
The charge and discharge interface is also connected with the standby charge and discharge switch through the first relay switch; the first relay switch is arranged on a standby charging and discharging loop of the lithium battery pack. Thus, the on-off control of the backup charge-discharge circuit is possible.
The charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch fails, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack. The main charge-discharge switch, the standby charge-discharge switch and the first relay switch can be controlled through the charge-discharge protection chip so as to perform on-off control on the charge loop. When the lithium battery pack is in normal work, the main charge-discharge switch is controlled by the charge-discharge protection chip to be switched on, so that the lithium battery pack is charged, or the lithium battery pack is discharged through the main charge-discharge switch. When the main charge-discharge switch fails and cannot be used, the main charge-discharge switch can be conducted through controlling the standby charge-discharge switch and the first relay switch, so that the lithium battery pack is continuously charged through the standby charge-discharge loop or is discharged through the standby charge-discharge loop.
The charge and discharge protection chip can judge whether the main charge circuit fails or not by detecting the voltage or the current of the lithium battery pack and detecting the voltage of the charge and discharge interface. When the charging and discharging protection chip is conducted by controlling the main charging switch and the charging and discharging interface has no voltage output or the charging and discharging loop has no current, the main loop is indicated and a fault occurs. The backup loop may be switched on. The current detection can be detected through a current detection resistor R14, the current detection resistor R14 is connected with the charging and discharging protection chip, and the current detection resistor R14 is arranged on the charging and discharging backflow to detect the current on the charging and discharging loop. The charge and discharge protection chip can obtain the current on the charge and discharge loop by detecting the voltage difference between two ends of the current detection resistor R14. The voltage detection can be obtained from the charging and discharging interface or two ends of the lithium battery pack. As shown in fig. 3, in another embodiment of the present invention, the dual lithium battery protection circuit further includes: the charge-discharge interface is also connected with the main charge-discharge switch through the second relay switch; the charge and discharge protection chip is also connected with the second relay switch to carry out on-off control on the second relay switch. And a second relay switch is also arranged on the main charging and discharging loop so as to close the main charging loop through the second relay when the main charging and discharging loop breaks down. In some special cases, the switch of the main charging loop may be in an uncontrolled conducting state after being damaged, so that the main charging loop can be closed through the second relay switch, and the current is prevented from flowing out of the main charging loop.
The embodiment of the utility model provides a dual lithium battery protection circuit is used for connecting charging equipment or consumer through the charge-discharge interface; the main charge-discharge switch controls the charge and discharge of the lithium battery pack; the standby charge-discharge switch controls the charge and discharge of the lithium battery pack; the charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch breaks down, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack. Because two lithium battery protection circuits are adopted. When the main charge-discharge switch breaks down, the standby charge-discharge switch can be started to continue to provide charge-discharge protection control for the lithium battery pack. Therefore, maintenance cost of replacing the lithium battery pack protection circuit board is reduced. And on the other hand, the failure rate of the lithium battery pack is reduced.
Referring to fig. 2, the first relay switch includes: a first switch end of the relay K1 is connected with the positive end of the charge-discharge interface, a second switch end of the relay K1 is connected with the positive end of the lithium battery through the standby charge-discharge switch, and a first magnetic control end of the relay K1 is connected with a positive end B4+ of the lithium battery pack; and the switch of the relay K1 is switched on or off under the action of magnetic control force. And the standby charging and discharging loop is controlled to be switched on and off.
The collector of triode Q1 with the magnetic control second end of relay K1 is connected, the projecting pole of triode Q1 is connected with reference ground, triode Q1's base pass through resistance R12 with a control end of charge-discharge protection chip is connected, triode Q1's base still passes through resistance R13 and is connected with reference ground, the charge-discharge protection chip passes through triode Q1 is right the relay carries out on-off drive control. The transistor Q1 provides driving force for the relay K1 to drive the relay K1 to be switched on or off. Specifically, when the control terminal CONTR of the charge-discharge protection chip outputs a high level, the triode Q1 is turned on, and the magnetic control terminal of the relay K1 generates magnetic attraction to attract the switch of the relay K1. Relay K1 is turned on, thereby realizing conduction control of the backup circuit. When the control terminal CONTR of the charge and discharge protection chip outputs a low level, the relay K1 is turned off.
The first relay switch further comprises: a diode D1, wherein the anode of the diode D1 is connected with the second end of the relay K1, and the cathode of the diode D1 is connected with the first end of the relay K1; when the magnetic control loop of the relay K1 is cut off, the diode D1 releases spike current. When the relay K1 is turned off, a high voltage pulse signal is generated between the two terminals of the relay K1 due to the current, so as to reduce the influence of the pulse signal on the transistor Q1. The transistor Q1 is prevented from being damaged by the high-voltage pulse signal.
The first relay switch further includes: the positive electrode of the light-emitting diode D2, the positive electrode of the light-emitting diode D2 is connected with the positive electrode B4+ of the lithium battery pack through a resistor R15, the cathode of the light-emitting diode D2 is connected with the collector of the triode Q1, and the light-emitting diode D2 is used for indicating the conducting state of the relay K1. The light emitting diode D2 can indicate the operating state of the first relay switch, specifically, when the relay K1 is turned on, the light emitting diode D2 is also turned on. Thereby emitting light. The user can acquire that the standby charging and discharging loop is opened, and can acquire the main charging and discharging loop and be damaged by acquiring the working state of the light emitting diode D2. Therefore, the lithium battery protection circuit board can be prompted to be replaced in time.
The main charge and discharge switch includes: a first discharging MOS switch M2 and a first charging MOS switch M1, wherein the source of the first discharging MOS switch M2 is connected with the positive terminal of the positive terminal B4+ of the lithium battery pack, and the gate of the first discharging MOS switch M2 is connected with the discharging control terminal of the charging and discharging protection chip; the drain of the first charging MOS switch M1 is connected to the drain of the first discharging MOS switch M2, the source of the first charging MOS switch M1 is connected to the positive terminal of the charging and discharging interface, and the gate of the first charging MOS switch M1 is connected to the charging control terminal of the charging and discharging protection chip. As shown in fig. 2, the first discharging MOS switch M2 and the first charging MOS switch M1 are multi-channel MOS switch transistors, respectively, to increase charging and discharging current.
The standby charge and discharge switch comprises: a second discharging MOS switch M4 and a second charging MOS switch M3, a source of the second discharging MOS switch M4 is connected to the positive terminal of the lithium battery pack, and a gate of the second discharging MOS switch M4 is connected to the discharging control terminal of the charging and discharging protection chip; the drain of the second charging MOS switch M3 is connected to the drain of the second discharging MOS switch M4, the source of the second charging MOS switch M3 is connected to the positive terminal of the charging and discharging interface through the first relay switch, and the gate of the second discharging MOS switch M4 is connected to the charging control terminal of the charging and discharging protection chip. As shown in fig. 2, the second discharging MOS switch M2 and the second charging MOS switch M1 are multi-channel MOS switch transistors, respectively, to increase the charging and discharging current.
The dual lithium battery protection circuit further includes: and the first relay switch is connected with the standby charging and discharging switch through the first fuse TF1 so as to perform overcurrent protection on the standby charging and discharging loop. The dual lithium battery protection circuit further includes: and the charge and discharge interface is connected with the main charge and discharge switch through the second fuse TF2 so as to perform overcurrent protection on the main charge and discharge loop. Through first fuse TF1 and second fuse TF2 set up on main charge-discharge circuit and reserve discharge circuit, like this, can carry out short-circuit protection to charge-discharge circuit, avoid producing the phenomenon of catching fire because of the short circuit.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalent substitutions can be made on the technical solutions described in the foregoing embodiments or some technical features thereof. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
Claims (10)
1. A dual lithium battery protection circuit, comprising:
the charging and discharging interface is used for connecting charging equipment or electric equipment;
the main charge and discharge switch is respectively connected with the charge and discharge interface and the lithium battery pack so as to control the charge and discharge of the lithium battery pack;
the standby charge-discharge switch is connected with the lithium battery pack so as to control the charge and discharge of the lithium battery pack;
the charge and discharge interface is also connected with the standby charge and discharge switch through the first relay switch;
the charge and discharge protection chip is respectively connected with the main charge and discharge switch, the standby charge and discharge switch and the first relay switch so as to control the main charge and discharge switch to charge and discharge the lithium battery pack; or when the main charge-discharge switch fails, the standby charge-discharge switch and the first relay switch are controlled to charge and discharge the lithium battery pack.
2. The dual lithium battery protection circuit of claim 1, wherein the first relay switch comprises:
a first switch end of the relay K1 is connected with a positive end of the charge-discharge interface, a second switch end of the relay K1 is connected with a positive end of the lithium battery through the standby charge-discharge switch, and a first magnetic control end of the relay K1 is connected with a positive end B4+ of the lithium battery pack;
triode Q1, triode Q1's collecting electrode with relay K1's magnetic control second end is connected, triode Q1's projecting pole is connected with reference ground, triode Q1's base pass through resistance R12 with a control end of charge-discharge protection chip is connected, triode Q1's base still passes through resistance R13 and is connected with reference ground, the charge-discharge protection chip passes through triode Q1 is right the relay carries out switch drive control.
3. The dual lithium battery protection circuit of claim 2, wherein the first relay switch further comprises:
a diode D1, wherein the anode of the diode D1 is connected with the second end of the relay K1, and the cathode of the diode D1 is connected with the first end of the relay K1; the off-time spike current of the relay K1 is released through the diode D1.
4. The dual lithium battery protection circuit of claim 2, wherein the first relay switch further comprises:
the anode of the light emitting diode D2 is connected with the positive terminal B4+ of the lithium battery pack through a resistor R15, the cathode of the light emitting diode D2 is connected with the collector of the triode Q1, and the light emitting diode D2 is used for indicating the conducting state of the relay K1.
5. The dual lithium battery protection circuit of claim 1, wherein the main charge and discharge switch comprises:
a first discharge MOS switch M2, wherein the source of the first discharge MOS switch M2 is connected with the positive terminal of the positive terminal B4+ of the lithium battery pack, and the gate of the first discharge MOS switch M2 is connected with the discharge control terminal of the charge-discharge protection chip;
the charging protection circuit comprises a first charging MOS switch M1, wherein the drain electrode of the first charging MOS switch M1 is connected with the drain electrode of the first discharging MOS switch M2, the source electrode of the first charging MOS switch M1 is connected with the positive end of the charging and discharging interface, and the grid electrode of the first charging MOS switch M1 is connected with the charging control end of the charging and discharging protection chip.
6. The dual lithium battery protection circuit of claim 1, wherein the backup charge and discharge switch comprises:
a second discharge MOS switch M4, a source of the second discharge MOS switch M4 is connected to the positive terminal of the lithium battery pack, and a gate of the second discharge MOS switch M4 is connected to a discharge control terminal of the charge and discharge protection chip;
a second charging MOS switch M3, a drain of the second charging MOS switch M3 is connected to a drain of the second discharging MOS switch M4, a source of the second charging MOS switch M3 is connected to a positive terminal of the charging and discharging interface through the first relay switch, and a gate of the second discharging MOS switch M4 is connected to a charging control terminal of the charging and discharging protection chip.
7. The dual lithium battery protection circuit of claim 1, further comprising:
and the first relay switch is connected with the standby charging and discharging switch through the first fuse TF1 so as to perform overcurrent protection on the standby charging and discharging loop.
8. The dual lithium battery protection circuit of claim 1, further comprising:
and the charge and discharge interface is connected with the main charge and discharge switch through the second fuse TF2 so as to perform overcurrent protection on the main charge and discharge loop.
9. The dual lithium battery protection circuit of claim 1, further comprising: the charge and discharge interface is also connected with the main charge and discharge switch through the second relay switch; the charge and discharge protection chip is also connected with the second relay switch to carry out on-off control on the second relay switch.
10. The dual lithium battery protection circuit of claim 1, further comprising:
the current detection resistor R14, the current detection resistor R14 with the charge-discharge protection chip is connected, the current detection resistor R14 sets up on the charge-discharge backward flow to current detection on the charge-discharge return circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220912356.2U CN217335160U (en) | 2022-04-19 | 2022-04-19 | Dual lithium battery protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220912356.2U CN217335160U (en) | 2022-04-19 | 2022-04-19 | Dual lithium battery protection circuit |
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| Publication Number | Publication Date |
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| CN217335160U true CN217335160U (en) | 2022-08-30 |
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| CN202220912356.2U Active CN217335160U (en) | 2022-04-19 | 2022-04-19 | Dual lithium battery protection circuit |
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