CN216390497U

CN216390497U - Battery protection circuit

Info

Publication number: CN216390497U
Application number: CN202121816152.0U
Authority: CN
Inventors: 林志坚
Original assignee: Chengdu Panorama Intelligent Technology Co ltd
Current assignee: Chengdu Panorama Intelligent Technology Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-04-26
Anticipated expiration: 2031-08-05

Abstract

The embodiment of the application discloses battery protection circuit, the circuit includes: the device comprises a battery module, a control module, a temperature detection module, a voltage detection module, a charging control switch and a discharging control switch; the battery module is electrically connected with a load or a charging interface sequentially through the voltage detection module, the charging control switch and the discharging control switch, wherein the control module is electrically connected with the battery module, the temperature detection module, the voltage detection module, the charging control switch and the discharging control switch respectively. By adopting the embodiment of the application, a low-cost and effective protection scheme can be provided for the charging and discharging condition and the overheating condition of the battery during working.

Description

Battery protection circuit

Technical Field

The application relates to the field of circuits, in particular to a battery protection circuit.

Background

Batteries are used as energy sources for various electronic devices including smart phones, notebook computers, PDAs, and the like. In the ordinary use of the battery, the abnormal working condition of overcharge or overdischarge can exist, and a large amount of heat can be generated by overcharge and overdischarge, so that the performance of the battery is reduced and even potential safety hazards are generated. Therefore, for different battery combinations and requirements on protection accuracy, protection cost, installation environment and the like, corresponding protection circuits are generally required to be equipped during the operation of the batteries.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery protection circuit, which can provide a low-cost and effective protection scheme aiming at the charging and discharging condition and the overheating condition when a battery works. The technical scheme is as follows:

in a first aspect, an embodiment of the present application provides a battery protection circuit, where the circuit includes:

the device comprises a battery module, a control module, a temperature detection module, a voltage detection module, a charging control switch and a discharging control switch;

the battery module is electrically connected with a load or a charging interface sequentially through the voltage detection module, the charging control switch and the discharging control switch, wherein the control module is electrically connected with the battery module, the temperature detection module, the voltage detection module, the charging control switch and the discharging control switch respectively;

the battery module is used for supplying power to the control module and supplying power to the load or charging through the charging interface;

the temperature detection module is used for detecting the temperature of the battery module and sending the temperature to the control module;

the voltage detection module is used for detecting a charging voltage when the battery module is charged through the charging interface or a discharging voltage when the battery module supplies power to the load, and sending the charging voltage and the discharging voltage to the control module;

the control module is used for controlling the charging control switch and/or the discharging control switch to be switched to an off state when the temperature is higher than or equal to a temperature protection threshold value; and the charging control switch is controlled to be switched to an off state when the charging voltage is greater than or equal to a charging voltage threshold value; and when the discharge voltage is greater than or equal to the discharge voltage threshold value, controlling the discharge control switch to be switched to an off state.

In one or more possible embodiments, the battery module includes: a first battery and a second battery; the control module includes: the control chip, the first filter circuit, the second filter circuit, the third filter circuit and the first diode; wherein, the control chip at least comprises: a first pin, a second pin, a third pin and a fourth pin;

the anode of the first battery is connected with the anode of the first diode and the first end of the second filter circuit respectively, the cathode of the first diode is connected with the first end of the first filter circuit, the second end of the first filter circuit is connected with the first pin of the control chip, and the second end of the second filter circuit is connected with the second pin of the control chip;

the negative electrode of the first battery is respectively connected with the first end of the third filter circuit and the positive electrode of the second battery, and the second end of the third filter circuit is connected with the third pin of the control chip;

the negative electrode of the second battery, the third end of the first filter circuit, the third end of the second filter circuit, the third end of the third filter circuit and the fourth pin of the control chip are grounded.

In one or more possible embodiments, the first filter circuit includes: a first resistor and a first capacitor; the second filter circuit includes: a second resistor and a second capacitor; the third filter circuit includes: a third resistor and a third capacitor;

the cathode of the first diode is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the first end of the first capacitor and the first pin of the control chip, and the second end of the first capacitor is grounded;

the positive electrode of the first battery is connected with the first end of the second resistor, the second end of the second resistor is respectively connected with the first end of the second capacitor and the second pin of the control chip, and the second end of the second capacitor is grounded;

the positive electrode of the second battery is connected with the first end of the third resistor, the second end of the third resistor is respectively connected with the first end of the third capacitor and the third pin of the control chip, and the second end of the third capacitor is grounded.

In one or more possible embodiments, the control module includes: the control chip, the control chip includes the fifth pin at least, voltage detection module includes: a fourth capacitor, a fourth resistor and a fifth resistor;

the fifth pin is respectively connected with the first end of the fourth capacitor and the first end of the fourth resistor, the second end of the fourth capacitor is grounded, the second end of the fourth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the second end of the fourth capacitor.

In one or more possible embodiments, the fifth resistance is an alloy resistance.

In one or more possible embodiments, the control module includes: the control chip, the control chip includes the sixth pin at least, the control module includes: a fifth capacitor and a sixth resistor;

the sixth pin is connected with the first end of the fifth capacitor and the first end of the sixth resistor respectively, the second end of the fifth capacitor is grounded, and the second end of the sixth resistor is connected with the charge control switch and the discharge control switch respectively;

the control module is further configured to detect, through the sixth pin, that the battery module is in a discharging state in which power is supplied to the load and/or in a charging state in which the battery module is charged through the charging interface.

In one or more possible embodiments, the control module includes: the control chip at least comprises a seventh pin; the charge control switch includes: the first MOS tube, the second diode, the seventh resistor and the eighth resistor;

the seventh pin is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the grid electrode of the first MOS tube and the first end of the seventh resistor respectively, the second end of the seventh resistor, the source electrode of the first MOS tube and the anode of the second diode are connected with the voltage detection module, and the drain electrode of the first MOS tube and the cathode of the second diode are connected with the discharge control switch.

In one or more possible embodiments, the control chip includes at least an eighth pin; the charge control switch includes: the second MOS tube, the third diode, the ninth resistor and the tenth resistor;

the eighth pin is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the grid electrode of the second MOS tube and the first end of the tenth resistor respectively, the second end of the tenth resistor, the source electrode of the second MOS tube and the anode of the third diode are connected, and the drain electrode of the second MOS tube, the drain electrode of the first MOS tube and the cathode of the third diode are connected.

In one or more possible embodiments, the temperature detection module includes: a temperature sensor and a sixth capacitance, the control module comprising: a control chip, the control chip comprising: a ninth pin;

the ninth pin is connected with the first end of the temperature sensor and the first end of the sixth capacitor, and the second end of the sixth capacitor is grounded with the temperature sensor.

In one or more possible embodiments, the temperature sensor is a thermistor.

The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:

this application detects the charge-discharge condition and the overheated condition of battery during operation through the circuit that is provided with temperature detection module, voltage detection module, when control module detected that the battery appears the excess temperature, overcharge or the condition of putting excessively, the control switch that the control corresponds switches to the off-state to make the battery stop to the load power supply or charge through the interface that charges, effective protection battery, extension battery life, and the battery protection circuit cost of this application is lower, and operational reliability is higher.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery protection circuit provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of another battery protection circuit provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of another battery protection circuit provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.

In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as controlling or implying relative importance. In the description of the present application, it is noted that, unless explicitly stated or limited otherwise, "including" and "having" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Fig. 1 is a schematic structural diagram of a battery protection circuit according to an embodiment of the present disclosure. In an embodiment of the present application, a battery protection circuit includes: battery module 101, control module 102, temperature detection module 104, voltage detection module 103, charge control switch 105, and discharge control switch 106. The battery module 101 is electrically connected to the load or the charging interface sequentially through the voltage detection module, the charging control switch and the discharging control switch, wherein the control module is electrically connected to the battery module, the temperature detection module, the voltage detection module, the charging control switch and the discharging control switch respectively.

And the battery module 101 is used for supplying power to the control module 102 and supplying power to a load or charging the charging interface. In the embodiment of the present application, the battery module 101 includes a battery, and the battery refers to a device capable of converting chemical energy into electric energy, specifically, the battery is a cup-shaped container, a trough-shaped container or a container with other shapes including an electrolyte solution and a metal electrode, and the metal electrode generates current under the action of the electrolyte solution to supply electric energy to a load or is charged through a charging interface, wherein the charging interface may be a Type-a interface, a Type-B interface or a Type-C interface supporting a Universal Serial Bus (USB) protocol. The types of batteries include, but are not limited to, dry cells, lead storage batteries, lithium batteries, and the like.

And the temperature detection module 104 is used for detecting the temperature of the battery module 101 and sending the temperature to the control module 102. In the embodiment of the present application, the temperature detection module 104 includes a temperature sensor (temperature transducer), which is a sensor capable of sensing temperature and converting into a usable output signal. The temperature sensors can be classified into a contact type and a non-contact type according to the measurement mode, and classified into a thermal resistor and a thermocouple according to the characteristics of sensor materials and electronic elements. It is understood that, in the embodiment of the present application, any limitation is made on the form, kind and number of the temperature sensors in the temperature detection module 104.

In the embodiment of the present application, the temperature detecting module 104 is disposed within a range of a linear distance X mm from the battery module 101, where X is a preset small value, for example, X is 3, that is, the temperature detecting module 104 is disposed within a range of a linear distance 3 mm from the battery module 101.

The temperature detection module 104 periodically detects the temperature of the battery module 101 and transmits the temperature value as a temperature detection result to the control module 102. In another embodiment, the control module 102 periodically receives the temperature sent by the temperature detection module 104. For example, when the temperature detection module 104 detects that the temperature value of the battery module 101 is 43 ℃, the pulse signal with 01000011 content is sent to the control module 102; when the control module 102 detects the pulse signal, it analyzes the pulse signal to know the temperature of the battery module 104. In another embodiment, the transmission mode may be a voltage, for example, a change in resistance value of the temperature detection module 104 based on a temperature change of the battery module 101 is set, which causes a change in voltage value of the temperature detection module 104; the control module 102 detects the current voltage value of the temperature detection module 104, and knows the temperature of the battery module 104 based on the corresponding relationship, for example, when the voltage value of the temperature detection module 104 is 3v, the temperature of the battery module 104 is 43 ℃.

The voltage detection module 103 is configured to detect a charging voltage when the battery module 101 is charged through the charging interface or a discharging voltage when the battery module 101 supplies power to a load, and send the charging voltage and the discharging voltage to the control module 102. The charging voltage may be understood as an operating voltage of the battery module 101 when charged through the charging interface, for example, the rated voltage of the battery module 101 is 5V, and the operating voltage when charged through the charging interface is 5.6V. The discharge voltage is understood to be an operating voltage when the battery module 101 supplies power to a load, and for example, the rated voltage of the battery module 101 is 5V, and the operating voltage when the battery module supplies power to the load is 6V.

When the battery module 101 is charged through the charging interface, the battery protection circuit forms a loop, and during abnormal operation, for example, when components are damaged in the loop, the charging voltage on the battery module 101 may suddenly rise, and the voltage detection module 103 periodically detects the charging voltage of the battery module 101 and sends the charging voltage value as a detection result to the control module 102. The transmission mode may be a pulsed current.

In another embodiment, the detected current of the voltage detection module 103 in the same loop is affected by the charging current of the battery module 101, and the control module 102 periodically obtains the detected current value of the voltage detection module 101, and calculates the charging voltage of the battery module 101 at that time according to the detected current value.

When the battery module 101 is discharged by a load, the battery protection circuit forms a loop, and the detection principle of the voltage detection module 103 detecting the discharge voltage of the battery module 101 is referred to above to detect the charge voltage.

The control module 102 is configured to control the charging control switch 105 and/or the discharging control switch 106 to switch to an off state when the temperature is higher than or equal to the temperature protection threshold; and for controlling the charge control switch 105 to switch to an off state when the charge voltage is greater than or equal to the charge voltage threshold; and controlling the discharge control switch 106 to switch to the off state when the discharge voltage is greater than or equal to the discharge voltage threshold. It is understood that the above-mentioned charge voltage and discharge voltage refer to absolute values of voltage values.

The control module 102 may include one or more processing cores that interface various portions of the overall control module 102 using various interfaces and circuitry to perform various functions of the server 1000 and process data by executing or executing instructions, programs, code sets, or instruction sets stored within the control module 102 and invoking data stored in the memory 1005. Optionally, the control module 102 may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA).

The charge control switch 105 can be understood as a switch module that switches between an off state and an on state based on a control method such as an instruction and a signaling of the control module 102. For example, the charge control switch 105 may include one or more of: single-pole single-throw switch, MOS tube, photosensitive diode, etc. When the charging control switch 105 is in a conducting state, the battery protection circuit forms a loop, and the battery module 101 is charged through the charging interface; when the charging control switch 105 is in the off state, an open circuit occurs in the battery protection circuit, and the battery module 101 stops charging through the charging interface, thereby protecting the battery module 101 to prevent the battery module 101 from being damaged.

The discharge control switch 106 may be understood as a switch module that switches between an off state and an on state based on a control method such as an instruction and a signaling of the control module 102. The discharge control switch 106 may have the same structure as the charge control switch 106.

The charge control switch 105 is connected in series with the discharge control switch 106, and when either one of the charge control switch 105 or the discharge control switch 106 is in an off state, the battery protection circuit is broken.

In the embodiment of the present application, the control module 102 determines that the battery module 101 is charged or supplies power to the load through the charging interface by detecting a current direction, detecting a voltage value, or receiving an instruction of the battery module 101. For example, when the battery protection circuit and the charging interface form a loop, the battery module 101 receives power, and when the battery protection circuit and the load form a loop, the battery module 101 provides power to the load, so that the current directions at the detection pins of the control module 102 under the two loops are opposite, and the control module 102 determines that the battery module 101 is in a power supply or charging state at the moment based on the current direction detected by the detection pins. In another embodiment, since the current direction formed by the two loops is opposite, the detected voltage formed at the voltage detecting module 103 has a positive value or a negative value, and the control module 102 determines that the battery module 101 is in a power supplying or charging state at this time by detecting the detected voltage at the voltage detecting module 103.

For example, the temperature protection threshold is 45 ℃, and the voltage threshold is 4.2V; the control module 102 detects that the battery module 101 is charged through the charging interface, and the control module 102 periodically receives the temperature of the battery module 101 detected by the temperature detection module 104 and the charging voltage of the battery module 101 detected by the voltage detection module 103; when the temperature of the battery module 101 is higher than or equal to the temperature protection threshold value of 45 ℃ obtained through analysis, sending a turn-off instruction to the charge control switch 105 and/or the discharge control switch 106 to switch the corresponding charge control switch 105 and/or the corresponding discharge control switch 106 to an off state, wherein the turn-off instruction may be a pulse current; when the charging voltage of the battery module 101 is greater than or equal to the charging voltage threshold 4.2V, the charging control switch 105 is controlled to switch to the off state. For another example, the control module 102 detects that the battery module 101 supplies power to the load, and the control module 102 periodically receives the temperature of the battery module 101 detected by the temperature detection module 104 and the discharge voltage of the battery module 101 detected by the voltage detection module 103.

As shown in fig. 2, a schematic structural diagram of another battery protection circuit provided in the embodiment of the present application is shown, in the embodiment of the present application, the battery protection circuit includes: the intelligent charging device comprises a charging control switch, a discharging control switch, a first filter circuit, a second filter circuit, a third filter circuit, a first diode D1, a fourth resistor R4, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a temperature sensor, a control chip U1, a first battery L1 and a second battery L2.

Wherein, the battery module includes: a first battery L1 and a second battery L2; the control module includes: the filter circuit comprises a first filter circuit, a second filter circuit, a third filter circuit, a control chip U1, a fifth capacitor C5 and a sixth resistor R6; the temperature detection module includes: a temperature sensor and a sixth capacitance C6; the voltage detection module includes: a fourth capacitor C4, a fourth resistor R4 and a fifth resistor R5.

The control chip U1 includes at least: a first pin VCC, a second pin B2, a third pin B1, a fourth pin VSS, a fifth pin IS, a sixth pin LM, a seventh pin DDR, an eighth pin CDR, and a ninth pin TX.

The following is the connection relationship between the elements in the embodiment of the present application:

the anode of the first battery L1 is connected with the anode of the first diode D1 and the first end of the second filter circuit respectively, the cathode of the first diode D1 is connected with the first end of the first filter circuit, the second end of the first filter circuit is connected with the first pin VCC of the control chip U1, and the second end of the second filter circuit is connected with the second pin B2 of the control chip U1; the negative electrode of the first battery L1 is respectively connected with the first end of the third filter circuit and the positive electrode of the second battery L2, and the second end of the third filter circuit is connected with the third pin of the control chip U1; the negative electrode of the second battery L2, the third terminal of the first filter circuit, the third terminal of the second filter circuit, the third terminal of the third filter circuit and the fourth pin VSS of the control chip U1 are grounded.

The fifth pin IS of the control chip U1 IS connected to the first end of the fourth capacitor C4 and the first end of the fourth resistor R4, respectively, the second end of the fourth capacitor C4 IS grounded, the second end of the fourth resistor R4 IS connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 IS connected to the second end of the fourth capacitor C4.

The sixth pin LM of the control chip U1 is connected to the first end of the fifth capacitor C5 and the first end of the sixth resistor R6, respectively, the second end of the fifth capacitor C5 is grounded, and the second end of the sixth resistor R6 is connected to the charge control switch and the discharge control switch, respectively.

The eighth pin CDR of the control chip U1 is connected to the first terminal of the temperature sensor and the first terminal of the sixth capacitor C6, and the second terminal of the sixth capacitor C6 is grounded to the temperature sensor.

The seventh pin DDR of the control chip U1 is connected with the charging control switch, the eighth pin CDR of the control chip U1 is connected with the discharging control switch, and the charging control switch is connected with the discharging control switch in series and then is connected with the charging interface or the load.

The ninth pin TX of the control chip U1 is connected to the first terminal of the temperature sensor and the first terminal of the sixth capacitor C6, and the second terminal of the sixth capacitor C6 is grounded to the temperature sensor.

The following is the working principle of the battery protection circuit provided by the embodiment of the application:

the first filter circuit, the second filter circuit and the third filter circuit are used for filtering out part of alternating current in current supplied to the control chip U1 from the first battery L1 and the second battery L2, the first battery L1 and the second battery L2 wake up the control chip U1 through a first pin VCC of the control chip U1, and supply electric energy to the control chip U1 through a second pin B2 and a third pin B3.

The control chip U1 detects the current direction on the sixth resistor R6 through the sixth pin LM, and judges that the first battery L1 and the second battery L2 are in a state of supplying power to a load or charging through a charging interface at the moment; detecting the current on a fifth resistor R5 through a fifth pin IS to further judge the charging voltage or the discharging voltage of a battery module consisting of the first battery L1 and the second battery L2, and when the charging voltage IS greater than or equal to a voltage threshold, sending a turn-off instruction to the charge control switch through a seventh pin DDR to enable the charge control switch to be switched to a turn-off state; when the discharge voltage is greater than or equal to the voltage threshold, a turn-off instruction is sent to the discharge control switch through the eighth pin CDR so that the discharge control switch is switched to a turn-off state; the control chip U1 receives the temperature from the temperature sensor through the ninth pin TX, and when it is determined that the temperature is greater than or equal to the temperature threshold value, sends a turn-off command to the corresponding control switch through the seventh pin DDR and/or the eighth pin CDR, so that the corresponding control switch is switched to the off state.

In the present application, the battery protection circuit detects a charging voltage or a discharging voltage of the battery module through a fifth resistor R5, and the fifth resistor R5 is an alloy resistor. The alloy resistor which is more sensitive to current change is used as the detection resistor of the voltage detection module, so that the accuracy of judging the charging voltage and the discharging voltage of the battery module is improved, and the working reliability of the battery protection circuit is effectively improved. In another embodiment, to reduce the installation space of the battery protection circuit and reduce the interference degree of the battery protection circuit, the fifth resistor R5 is an alloy chip resistor.

As shown in fig. 3, a schematic structural diagram of another battery protection circuit provided in the embodiment of the present application is shown, in the embodiment of the present application, the battery protection circuit includes: the charging control switch, the discharging control switch, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the first diode D1, the second diode D2, the third diode D3, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the thermistor R11, the first triode Q1, the second triode Q2, the control chip U1, the first battery L1, and the second battery L2.

Wherein, the battery module includes: a first battery L1 and a second battery L2; the control module includes: the filter circuit comprises a first filter circuit, a second filter circuit, a third filter circuit, a control chip U1, a fifth capacitor C5 and a sixth resistor R6; the temperature detection module includes: a temperature sensor and a sixth capacitance C6; the voltage detection module includes: a fourth capacitor C4, a fourth resistor R4 and a fifth resistor R5. The connection mode of the above elements is shown in fig. 2, and will not be described again.

The first filter circuit shown in fig. 2 includes: first resistance R1 and first electric capacity C1, the second filter circuit includes: a second resistor R2 and a second capacitor C2; the third filter circuit includes: a third resistor R3 and a third capacitor C3; the charge control switch includes: the first MOS transistor Q1, the second diode D2, the seventh resistor R7 and the eighth resistor R8; the charge control switch includes: a second MOS transistor Q2, a third diode D3, a ninth resistor R9 and a tenth resistor R10.

a cathode of the first diode D1 is connected to a first end of the first resistor R1, a second end of the first resistor R1 is connected to a first end of the first capacitor C1 and a first pin VCC of the control chip U1, and a second end of the first capacitor R1 is grounded;

the positive electrode of the first battery L1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is respectively connected with the first end of the second capacitor R2 and the second pin B2 of the control chip U1, and the second end of the second capacitor R2 is grounded;

the anode of the second battery L2 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the first end of the third capacitor R3 and the third pin B1 of the control chip U1, and the second end of the third capacitor R3 is grounded.

A seventh pin DDR of the control chip U1 is connected to a first end of an eighth resistor R8, a second end of the eighth resistor R8 is connected to a gate of the first MOS transistor Q1 and a first end of the seventh resistor R7, respectively, a second end of the seventh resistor R7, a source of the first MOS transistor Q1, and an anode of the second diode D2 are connected to a second end of the sixth resistor R6, and a drain of the first MOS transistor Q1 is connected to a cathode of the second diode D2.

An eighth pin CDR of the control chip U1 is connected to a first end of a ninth resistor R9, a second end of the ninth resistor R9 is connected to a gate of the second MOS transistor Q2 and a first end of a tenth resistor R10, respectively, a second end of the tenth resistor R10, a source of the second MOS transistor Q2, and an anode of the third diode D3, and a drain of the second MOS transistor Q2, a drain of the first MOS transistor Q1, and a cathode of the third diode D3 are connected to each other.

The working principle of the battery protection circuit of the present application is referred to the above fig. 2, and will not be described herein. The combined circuit of the triode and the diode is used as the discharge control switch and the charge control switch, and on the premise that the reliability that the charge control switch and the discharge control switch can be switched to a disconnection state when receiving a turn-off instruction from the control chip is guaranteed, the structure is simple, and the cost is low.

The temperature sensor is replaced by the thermistor R11, and the current value of the thermistor is detected by the control chip U1 through the ninth pin TX, so that the temperature of the battery module comprising the first battery L1 and the second battery L2 is calculated. The application has the advantages of low cost, simple structure and convenience in installation.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory or a random access memory.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and therefore, the present application is intended to cover all equivalent variations of the present application.

Claims

1. A battery protection circuit, the circuit comprising:

2. The circuit of claim 1, wherein the battery module comprises: a first battery and a second battery; the control module includes: the control chip, the first filter circuit, the second filter circuit, the third filter circuit and the first diode; wherein, the control chip at least comprises: a first pin, a second pin, a third pin and a fourth pin;

3. The circuit of claim 2, wherein the first filter circuit comprises: a first resistor and a first capacitor; the second filter circuit includes: a second resistor and a second capacitor; the third filter circuit includes: a third resistor and a third capacitor;

4. The circuit of claim 1, wherein the control module comprises: the control chip, the control chip includes the fifth pin at least, voltage detection module includes: a fourth capacitor, a fourth resistor and a fifth resistor;

5. The circuit of claim 4, wherein the fifth resistance is an alloy resistance.

6. The circuit of claim 1, wherein the control module comprises: the control chip, the control chip includes the sixth pin at least, the control module includes: a fifth capacitor and a sixth resistor;

7. The circuit of claim 1, wherein the control module comprises: the control chip at least comprises a seventh pin; the charge control switch includes: the first MOS tube, the second diode, the seventh resistor and the eighth resistor;

8. The circuit of claim 7, wherein the control chip comprises at least an eighth pin; the charge control switch includes: the second MOS tube, the third diode, the ninth resistor and the tenth resistor;

9. The circuit of claim 1, wherein the temperature detection module comprises: a temperature sensor and a sixth capacitance, the control module comprising: a control chip, the control chip comprising: a ninth pin;

10. The circuit of claim 9, wherein the temperature sensor is a thermistor.