CN217307274U - Battery protection circuit and battery protection system - Google Patents
Battery protection circuit and battery protection system Download PDFInfo
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- CN217307274U CN217307274U CN202122861765.2U CN202122861765U CN217307274U CN 217307274 U CN217307274 U CN 217307274U CN 202122861765 U CN202122861765 U CN 202122861765U CN 217307274 U CN217307274 U CN 217307274U
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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
- 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
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Abstract
The application relates to the technical field of battery protection, especially, relate to a battery protection circuit and battery protection system, the circuit part includes: the battery protection chip comprises a battery detection end, a grounding end, a first driving end and a second driving end; the control end of the first switch tube is connected to the first drive end, the control end of the second switch tube is connected to the second drive end, the first end of the first switch tube and the second end of the second switch tube are connected in common and serve as charge and discharge negative terminals, and the second end of the first switch tube, the first end of the second switch tube and the ground terminal are connected in common and are used for being connected to the negative terminal of the battery; the positive end of the battery is connected to the battery detection end and serves as a charging and discharging positive end.
Description
Technical Field
The application relates to the technical field of battery protection, in particular to a battery protection circuit and a battery protection system.
Background
With the development of the IT industry, the application of lithium batteries is more and more extensive, the design requirement on the lithium batteries is higher and higher, particularly the internal resistance requirement of the batteries is higher and higher, and many customers want to make the internal resistance of the batteries lower and better, so that many lithium battery protection designs are developed on the basis.
The inventor finds that, as shown in fig. 1, in the conventional lithium battery protection circuit, an EB + terminal and an EB-terminal are used for connecting a load or a charger, a VDD terminal is a battery detection terminal for overcharge or overdischarge, a VSS terminal is a grounding terminal, a chip U1 avoids latch-up effect through a VN terminal and a resistor R2, a DO terminal controls a FET1 to be turned off or closed, and a CO terminal controls a FET2 to be turned off or closed for charge and discharge control, as seen from fig. 1, in the conventional scheme, charge and discharge control is performed in a mode of serially connecting FET tubes, so that the internal resistance of a line is FET1 plus FET 2; the resistance of the protection circuit is improved and the loss is improved by being equivalent to twice the internal resistance of the FET.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a battery protection circuit and a battery protection system, so as to solve the technical problems that the loop impedance of the traditional battery protection circuit is too high and the loss is improved.
A battery protection circuit comprises a battery protection chip, a first switch tube and a second switch tube, wherein the battery protection chip comprises a battery detection end, a grounding end, a first driving end and a second driving end;
the control end of the first switch tube is connected to the first drive end, the control end of the second switch tube is connected to the second drive end, the first end of the first switch tube and the second end of the second switch tube are connected in common and serve as charge and discharge negative terminals, and the second end of the first switch tube, the first end of the second switch tube and the grounding terminal are connected in common and are used for being connected to the negative terminal of a battery;
the positive end of the battery is connected to the battery detection end and serves as a charging and discharging positive end.
In one embodiment, the battery protection circuit further includes a first resistor, one end of the first resistor is connected to the positive terminal of the battery, and the other end of the first resistor is connected to the battery detection terminal.
In an embodiment, the battery protection circuit further includes a first capacitor, one end of the first capacitor is connected to the battery detection terminal, and the other end of the first capacitor is connected to the ground terminal.
In an embodiment, the battery protection chip further includes a charging/discharging state detection terminal, the battery protection circuit further includes a second resistor, one end of the second resistor is connected to the state detection terminal, and the other end of the second resistor is connected to the first end of the first switch tube and the second end of the second switch tube.
In an embodiment, the first switch tube includes a first field effect transistor, the second switch tube includes a second field effect transistor, the gate, the drain and the source of the first field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the first switch tube, and the gate, the drain and the source of the second field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the second switch tube.
A battery protection system comprising a battery, a charger and a battery protection circuit as claimed in any preceding claim, wherein a positive terminal of the charger is connected to the positive charge and discharge terminal and a negative terminal of the charger is connected to the negative charge and discharge terminal.
A battery protection system comprising a battery, a load and a battery protection circuit as claimed in any preceding claim, wherein one end of the load is connected to the positive charge and discharge terminal and the other end of the load is connected to the negative charge and discharge terminal.
In the application, the first switch tube and the second switch tube are placed in parallel, so that loop impedance is effectively reduced, and the circuit working logic of the battery protection chip is correspondingly adjusted; in the discharging process, the first switch tube is in a conducting state, and the second switch tube is in an off state. The circuit can realize the charging and discharging protection functions of the original design, can reduce the impedance of the whole protection loop, reduces the loss, has great significance to the practical design and application, and has higher application scene.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a battery protection circuit according to an embodiment of the present application;
fig. 2 is another schematic structural diagram of a battery protection circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery protection system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a battery protection system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
In one embodiment, as shown in fig. 1, a battery protection circuit is provided, which includes a battery protection chip U1, a first switch Q1, and a second switch Q2, where the battery protection chip U1 includes a battery detection terminal VDD, a ground terminal VSS, a first driving terminal DO, and a second driving terminal CO;
a control end of the first switch tube Q1 is connected to the first driving end DO, a control end of the second switch tube Q2 is connected to the second driving end CO, a first end of the first switch tube Q1 and a second end of the second switch tube Q2 are connected in common and serve as a charging and discharging negative terminal P-, a second end of the first switch tube Q1, a first end of the second switch tube Q2 and the ground terminal VSS are connected in common and serve as a negative terminal of the battery; the positive terminal of the battery is connected to the battery detection terminal VDD and serves as a charge and discharge positive terminal P +.
The battery detection end VDD is a detection end for overcharge or overdischarge of the battery and is also an input detection end of a positive end of the battery, the first driving end DO is a discharge control end, the second driving end CO is a charge control end, the first switch tube Q1 is controlled by the first driving end DO to be turned off or turned on, and the second switch tube Q2 is controlled by the second driving end CO to be turned off or turned on.
In the application, the first switch tube Q1 and the second switch tube Q2 are placed in parallel, so that loop impedance is effectively reduced, and the working logic of the circuit of the battery protection chip U1 is correspondingly adjusted, wherein in the charging process, the first switch tube Q1 is in an off state, and the second switch tube Q2 is in an on state; during the discharging process, the first switch Q1 is in the on state, and the second switch Q2 is in the off state. The circuit can realize the charging and discharging protection functions of the original design, can reduce the impedance of the whole protection loop, has great significance to the practical design and application, and has higher application scene.
As shown in fig. 1, in some embodiments, the first switch Q1 includes a first field effect transistor, and the second switch Q2 includes a second field effect transistor, wherein the gate, the drain and the source of the first field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the first switch Q1, and the gate, the drain and the source of the second field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the second switch Q2.
That is, the control terminal of the first fet Q1 is connected to the first driving terminal DO, the control terminal of the second fet Q2 is connected to the second driving terminal CO, the drain of the first fet Q1 and the source of the second NMOS transistor Q2 are connected in common and serve as the charging and discharging negative terminal P-, the source of the first NMOS transistor Q1, the drain of the second NMOS transistor Q2 and the ground terminal VSS are connected in common and serve as the negative terminal of the battery; the positive terminal of the battery is connected to the battery detection terminal VDD and serves as a charge and discharge positive terminal P +.
It should be noted that, in some embodiments, the first field effect transistor or the second field effect transistor may be a junction field effect transistor FET or an insulated gate field effect transistor MOS or other types of transistor switching transistors, and the present application is not limited thereto.
In some embodiments, referring to fig. 2, the battery protection circuit further includes a first resistor R1, one end of the first resistor R1 is used for connecting with the positive terminal of the battery, and the other end of the first resistor R1 is connected with the battery detection terminal VDD. In this embodiment, the ESD (electrostatic discharge) capability of the pin of the battery detection terminal VDD can be enhanced by the first resistor R1.
In some embodiments, the battery protection circuit further includes a first capacitor C1, wherein one end of the first capacitor C1 is connected to the battery detection terminal VDD, and the other end is connected to the ground terminal VSS. In this embodiment, the first capacitor C1 and the first resistor R1 together can reduce the voltage fluctuation of the battery detection terminal VDD.
In some embodiments, the battery protection chip further includes a charging/discharging state detection terminal VM, the battery protection circuit further includes a second resistor R2, one end of the second resistor R2 is connected to the state detection terminal VM, and the other end of the second resistor R2 is connected to the first end of the first switch tube Q1 and the second end of the second switch tube Q2, so that the second resistor R2 can effectively prevent the battery from being connected to the charger after over-discharge or from being reversely connected to the charger, thereby avoiding latch reaction and providing overall circuit stability.
It should be noted that, in some embodiments, the battery protection chip may be an S-8261 series battery protection chip, and is not limited specifically.
In some embodiments, as shown in fig. 3, a battery protection system is provided, which comprises a battery, a charger and the battery protection circuit of any one of the previous embodiments, wherein a positive terminal of the charger is connected to the positive charging and discharging terminal, and a negative terminal of the charger is connected to the negative charging and discharging terminal. The battery protection system can realize overcharge protection of the charger in the process of charging the battery, and can effectively reduce the overall back impedance and reduce the loss.
In some embodiments, as shown in fig. 4, there is further provided a battery protection system, which includes a battery, a load and the battery protection circuit according to any one of the previous embodiments, wherein one end of the load is connected to the positive charging and discharging terminal, and the other end of the load is connected to the negative charging and discharging terminal. The battery protection system can effectively ensure the overdischarge protection of the battery to the load discharge process, and can effectively reduce the overall returned impedance and reduce the loss.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (7)
1. A battery protection circuit is characterized by comprising a battery protection chip, a first switch tube and a second switch tube, wherein the battery protection chip comprises a battery detection end, a grounding end, a first driving end and a second driving end;
the control end of the first switch tube is connected to the first drive end, the control end of the second switch tube is connected to the second drive end, the first end of the first switch tube and the second end of the second switch tube are connected in common and serve as charge and discharge negative terminals, and the second end of the first switch tube, the first end of the second switch tube and the grounding terminal are connected in common and are used for being connected to the negative terminal of a battery;
the positive end of the battery is connected to the battery detection end and serves as a charging and discharging positive end.
2. The battery protection circuit of claim 1, further comprising a first resistor having one end for connection to the positive terminal of the battery and the other end connected to the battery sense terminal.
3. The battery protection circuit according to claim 1 or 2, further comprising a first capacitor having one end connected to the battery detection terminal and the other end connected to the ground terminal.
4. The battery protection circuit according to claim 1 or 2, wherein the battery protection chip further comprises a charging and discharging state detection terminal, the battery protection circuit further comprises a second resistor, one end of the second resistor is connected to the state detection terminal, and the other end of the second resistor is connected to the first end of the first switch tube and the second end of the second switch tube.
5. The battery protection circuit according to claim 1 or 2, wherein the first switching tube comprises a first field effect transistor, the second switching tube comprises a second field effect transistor, the gate, the drain and the source of the first field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the first switching tube, and the gate, the drain and the source of the second field effect transistor are respectively used as the control terminal, the first terminal and the second terminal of the second switching tube.
6. A battery protection system comprising a battery, a charger and a battery protection circuit as claimed in any one of claims 1 to 5, wherein a positive terminal of the charger is connected to the positive charge and discharge terminal and a negative terminal of the charger is connected to the negative charge and discharge terminal.
7. A battery protection system comprising a battery, a load and the battery protection circuit of any one of claims 1-5, wherein one end of the load is connected to the positive charge and discharge terminal and the other end of the load is connected to the negative charge and discharge terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861765.2U CN217307274U (en) | 2021-11-19 | 2021-11-19 | Battery protection circuit and battery protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122861765.2U CN217307274U (en) | 2021-11-19 | 2021-11-19 | Battery protection circuit and battery protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217307274U true CN217307274U (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122861765.2U Active CN217307274U (en) | 2021-11-19 | 2021-11-19 | Battery protection circuit and battery protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217307274U (en) |
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2021
- 2021-11-19 CN CN202122861765.2U patent/CN217307274U/en active Active
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