CN217824248U

CN217824248U - Battery protection circuit, discharge circuit of battery

Info

Publication number: CN217824248U
Application number: CN202220949922.7U
Authority: CN
Inventors: 童文平; 田仁军
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-11-15
Anticipated expiration: 2032-04-22

Abstract

The application relates to a discharge circuit of battery protection circuit, battery, the electric energy output circuit at battery place switches on when receiving activating signal to make battery output signal of telecommunication, battery protection circuit includes: the undervoltage detection module is used for detecting the voltage of the battery and outputting a first protection signal when the voltage of the battery is less than or equal to an undervoltage protection threshold value; the overvoltage detection module is used for detecting the voltage of the battery and outputting a second protection signal when the voltage of the battery is greater than or equal to an overvoltage protection threshold value; and the trigger module is used for disconnecting the transmission circuit of the activation signal when receiving the first protection signal or the second protection signal, so that the electric energy output circuit where the battery is located cannot receive the activation signal. The embodiment of the application avoids the problem that the battery is activated to influence the service life of the battery when the battery is in overvoltage or undervoltage by carrying out undervoltage and overvoltage detection on the battery, and realizes the function of protecting the battery when the battery is in undervoltage or overvoltage.

Description

Battery protection circuit, discharge circuit of battery

Technical Field

The utility model relates to a protection circuit technical field especially relates to a discharge circuit of battery protection circuit, battery.

Background

In the energy storage System, the Power supply of the Battery Management System (BMS) usually requires external signal activation, such as key activation, port voltage activation, or Power Conversion System (PCS) activation.

When the battery is activated by the key, the battery is activated to discharge at the moment when the key is pressed down, but if the battery is under-voltage or over-voltage, the battery is over-discharged due to repeated key activation, the service life of the battery is shortened, and the external circuit is possibly damaged due to over-voltage of the battery.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a discharge circuit of battery protection circuit, battery solves the problem that activates its life when battery excessive pressure or under-voltage, realizes the function of protection battery when battery is under-voltage or excessive pressure.

According to a first aspect of the present application, there is provided a battery protection circuit, in which a power output circuit of a battery is turned on when receiving an activation signal, so that the battery outputs an electrical signal, the battery protection circuit including:

the undervoltage detection module is connected with the battery and used for detecting the voltage of the battery and outputting a first protection signal when the voltage of the battery is less than or equal to an undervoltage protection threshold value;

the overvoltage detection module is connected with the battery and used for detecting the voltage of the battery and outputting a second protection signal when the voltage of the battery is greater than or equal to an overvoltage protection threshold value;

and the trigger module is respectively connected with the output end of the undervoltage detection circuit and the output end of the overvoltage detection circuit and is used for disconnecting the transmission circuit of the activation signal when receiving the first protection signal or the second protection signal so that the electric energy output circuit where the battery is located can not receive the activation signal.

In some embodiments of the present application, based on the above scheme, the under-voltage detection module includes:

the input end of the first sampling unit is connected with the battery and is used for sampling the voltage of the battery and outputting an undervoltage signal when the voltage of the battery is less than or equal to the undervoltage protection threshold value;

the first switch unit is connected between the battery and the controlled end of the trigger module, the controlled end of the first switch unit is connected with the output end of the first sampling unit, and the controlled end of the first switch unit is disconnected when receiving the undervoltage signal so as to output the first protection signal.

In some embodiments of the present application, based on the above scheme, the first sampling unit includes:

a first resistor, a first end of the first resistor being connected to the battery;

a first end of the second resistor is connected with a second end of the first resistor, and a second end of the second resistor is grounded;

the reference electrode of the first voltage-stabilizing tube is connected with the second end of the first resistor, the negative electrode of the first voltage-stabilizing tube is connected with the first switch unit, and the positive electrode of the first voltage-stabilizing tube is grounded.

In some embodiments of the present application, based on the above scheme, the first switch unit includes:

a third resistor, a first end of the third resistor being connected to the battery;

the controlled end of the first switch tube is connected with the negative electrode of the first voltage regulator tube and the second end of the third resistor respectively, the first end of the first switch tube is connected with the battery, the second end of the first switch tube is connected with the trigger module, and the first switch tube is disconnected when the controlled end of the first switch tube receives the undervoltage signal so as to output the first protection signal.

In some embodiments of the present application, based on the above solution, the overvoltage detection module includes:

the input end of the second sampling unit is connected with the battery and used for sampling the battery and outputting an overvoltage signal when the voltage of the battery is greater than or equal to the overvoltage protection threshold value;

and the second switch unit is connected between the battery and the trigger module, the controlled end of the second switch unit is connected with the output end of the second sampling unit, and the controlled end of the second switch unit is conducted when receiving the overvoltage signal so as to output the second protection signal.

In some embodiments of the present application, based on the above scheme, the second sampling unit includes:

a fourth resistor, a first end of the fourth resistor being connected to the battery;

a first end of the fifth resistor is connected with a second end of the fourth resistor, and a second end of the fifth resistor is grounded;

and the reference electrode of the second voltage-stabilizing tube is connected with the second end of the fourth resistor, the negative electrode of the second voltage-stabilizing tube is connected with the second switch unit, and the positive electrode of the second voltage-stabilizing tube is grounded.

In some embodiments of the present application, based on the above scheme, the second switch unit includes:

a controlled end of the second switch tube is connected with a negative electrode of the second voltage regulator tube, a first end of the second switch tube is connected with the battery, and the second switch tube is conducted when the controlled end of the second switch tube receives the overvoltage signal;

the sixth resistor is connected between the controlled end of the second switching tube and the first end of the second switching tube;

a first end of the seventh resistor is connected with a second end of the second switch tube;

a controlled end of the third switching tube is connected with a second end of the seventh resistor, a first end of the third switching tube is connected with the trigger module, a second end of the third switching tube is grounded, and the third switching tube is conducted when the second switching tube is conducted to output the second protection signal;

and a first end of the eighth resistor is connected with a second end of the seventh resistor, and a second end of the eighth resistor is grounded.

In some embodiments of the present application, based on the above scheme, the triggering module includes:

a first end of the ninth resistor is connected with the output end of the under-voltage detection circuit, and a second end of the ninth resistor is connected with the output end of the over-voltage detection circuit;

and a controlled end of the fourth switching tube is connected with a second end of the ninth resistor, a second end of the fourth switching tube is grounded, and when the controlled end of the fourth switching tube receives the first protection signal or the second protection signal, the fourth switching tube is triggered to be disconnected, so that the transmission circuit of the activation signal is disconnected.

A tenth resistor connected between the controlled terminal of the fourth switching tube and the second terminal of the fourth switching tube.

According to a second aspect of the present application, there is provided a discharge circuit of a battery, the discharge circuit including:

the input end of the activation circuit is connected with the battery through an activation key, and when the activation key is pressed down, the input end of the activation circuit generates an activation signal and transmits the activation signal to the output end;

the input end of the electric energy output circuit is connected with the battery, the output end of the electric energy output circuit is connected with the discharge management module, the controlled end of the electric energy output circuit is connected with the output end of the activation circuit, and the controlled end of the electric energy output circuit is conducted with the input end and the output end of the electric energy output circuit when receiving the activation signal;

the battery protection circuit is the battery protection circuit of the first aspect, a trigger module of the battery protection circuit is connected with a controlled end of the activation circuit, and when the voltage of the battery is under-voltage or overvoltage, the trigger module triggers the activation circuit to be disconnected, so that an electric energy output circuit where the battery is located cannot receive the activation signal.

In some embodiments of the present application, based on the above scheme, the activation circuit includes:

a controlled end of the fifth switching tube is connected with the trigger module, a first end of the fifth switching tube is connected with the activation key, and the fifth switching tube is disconnected when the battery is under-voltage or over-voltage;

a controlled end of the sixth switching tube is connected with a second end of the fifth switching tube, a first end of the sixth switching tube is grounded, and the sixth switching tube is disconnected when the fifth switching tube is disconnected;

the power output circuit includes:

the controlled end of the seventh switching tube is connected with the second end of the sixth switching tube, the first end of the seventh switching tube is connected with the battery, the second end of the seventh switching tube is connected with the battery management system, and the seventh switching tube is disconnected when the sixth switching tube is disconnected so as to prevent the battery from discharging through the discharge management module.

The embodiment of the application avoids the problem that the service life of the battery is influenced by activating the battery when the battery is in overvoltage or undervoltage by carrying out undervoltage and overvoltage detection on the battery, and realizes the function of protecting the battery when the battery is in undervoltage or overvoltage.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic diagram illustrating a first battery protection circuit according to an embodiment.

Fig. 2 is a schematic diagram illustrating a second battery protection circuit according to an embodiment.

Fig. 3 is a schematic diagram illustrating a third battery protection circuit according to an embodiment.

Fig. 4 is a schematic diagram illustrating a fourth battery protection circuit according to an embodiment.

Fig. 5 is a schematic diagram illustrating a fifth battery protection circuit according to an embodiment.

Fig. 6 is a schematic diagram illustrating a sixth battery protection circuit according to an embodiment.

Fig. 7 is a schematic diagram illustrating a seventh battery protection circuit according to an embodiment.

Fig. 8 is a schematic diagram illustrating a structure of an eighth battery protection circuit according to an embodiment.

Fig. 9 is a schematic diagram illustrating a ninth battery protection circuit according to an embodiment.

Fig. 10 is a schematic diagram illustrating a structure of a discharge circuit of the first battery according to an embodiment.

Fig. 11 is a schematic diagram illustrating a discharge circuit of a second battery according to an embodiment.

Fig. 12 is a schematic diagram illustrating a discharge circuit of a third battery according to an embodiment.

Description of reference numerals:

110: undervoltage detection module

120: overvoltage detection module

130: trigger module

111: first sampling unit

112: first switch unit

121: second sampling unit

122: second switch unit

210: activation circuit

220: electric energy output circuit

230: battery protection circuit

R1 to R20: first to twentieth resistors

U1: first voltage regulator tube

U2: second voltage regulator tube

Q1 to Q7: first to seventh switching tubes

C1 to C5: first to fifth capacitors

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying the number of indicated technical features. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

When the electric energy output circuit where the battery is located receives the activation signal, the electric energy output circuit is conducted, and the battery can output an electric signal to the outside. The battery is in under-voltage or under the excessive pressure condition, and the condition that the battery overruns can appear in the repeated activation battery to reduce battery life, and battery excessive pressure then can cause the damage to the external circuit of battery.

In view of the above, the present application proposes a battery protection circuit, and fig. 1 is a schematic structural diagram of a first battery protection circuit according to an embodiment. As shown in fig. 1, the circuit includes at least the following.

The undervoltage detection module 110 is connected to the battery, and configured to detect a voltage of the battery and output a first protection signal when the voltage of the battery is less than or equal to an undervoltage protection threshold.

And an overvoltage detection module 120 connected to the battery, for detecting a voltage of the battery and outputting a second protection signal when the voltage of the battery is greater than or equal to the overvoltage protection threshold.

The trigger module 130 is connected to the output end of the under-voltage detection circuit 110 and the output end of the over-voltage detection circuit 120, and the trigger module 130 is configured to disconnect the transmission circuit of the activation signal when receiving the first protection signal or the second protection signal, so that the power output circuit where the battery is located cannot receive the activation signal.

The user can generate an activation signal through a physical hard key or a soft key, the transmission circuit of the activation signal can transmit the activation signal to the electric energy output circuit, the electric energy output circuit is conducted after receiving the activation signal, and the battery releases electric energy. The trigger module disconnects the transmission circuit of the activation signal when receiving the first protection signal or the second protection signal, so that the electric energy output circuit where the battery is located cannot receive the activation signal and further cannot discharge.

The embodiment of the application avoids the problem that the battery is activated to influence the service life of the battery when the battery is in overvoltage or undervoltage by carrying out undervoltage and overvoltage detection on the battery, and realizes the function of protecting the battery when the battery is in undervoltage or overvoltage.

Fig. 2 is a schematic diagram illustrating a second battery protection circuit according to an embodiment. As shown in fig. 2, the brown-out detection module 110 includes at least the following components based on fig. 1.

The input end of the first sampling unit 111 is connected with the battery, and is used for sampling the voltage of the battery and outputting an undervoltage signal when the voltage of the battery is less than or equal to an undervoltage protection threshold value.

The first switch unit 112, the first switch unit 112 is connected between the battery and the controlled end of the trigger module 130, the controlled end of the first switch unit 112 is connected with the output end of the first sampling unit 111, and the controlled end of the first switch unit 112 is disconnected when receiving the under-voltage signal to output the first protection signal.

In the embodiment of the application, the first sampling unit 111 samples the battery, outputs the undervoltage signal when the battery is undervoltage, and controls the first switch unit 112 to be turned off to output the first protection signal.

Fig. 3 is a schematic diagram illustrating a third battery protection circuit according to an embodiment. As shown in fig. 3, on the basis of fig. 2, the first sampling unit 111 includes at least the following parts.

The first resistor R1, the first end of the first resistor R1 is connected with the battery;

a first end of the second resistor R2 is connected with a second end of the first resistor R1, and a second end of the second resistor R2 is grounded;

the reference electrode of the first voltage-regulator tube U1 is connected with the second end of the first resistor R1, the negative electrode of the first voltage-regulator tube U1 is connected with the first switch unit 112, the positive electrode of the first voltage-regulator tube U1 is grounded, and the first voltage-regulator tube U1 is cut off when the voltage of the battery is less than or equal to the undervoltage protection threshold value so as to output an undervoltage signal.

According to the embodiment of the application, the battery is subjected to voltage division through the first resistor R1 and the second resistor R2, when the battery is under-voltage, the voltage of the first end of the second resistor R2 is smaller than the breakover voltage of the first voltage-regulator tube U1, the first voltage-regulator tube U1 is cut off, the negative electrode of the first voltage-regulator tube U1 is in a high resistance state, and an under-voltage signal is output.

It should be noted that, the battery is neither undervoltage nor overvoltage, and when the battery is in the normal voltage value range, the voltage of the first end of the second resistor R2 is greater than or equal to the turn-on voltage of the first voltage regulator tube U1, and the first voltage regulator tube U1 is turned on.

Fig. 4 is a schematic diagram illustrating a fourth battery protection circuit according to an embodiment. As shown in fig. 4, on the basis of fig. 3, the first switching unit 112 includes at least the following portions.

And a first end of the third resistor R3 is connected with the battery.

The controlled end of the first switch tube Q1 is connected with the negative electrode of the first voltage-stabilizing tube U1 and the second end of the third resistor R3, respectively, the first end of the first switch tube Q1 is connected with the battery, the second end of the first switch tube Q1 is connected with the trigger module 130, and the first switch tube Q1 is disconnected when the controlled end of the first switch tube Q1 receives an undervoltage signal to output a first protection signal.

When the first voltage-stabilizing tube U1 is cut off, a loop formed by the battery, the third resistor R3 and the first voltage-stabilizing tube U1 is disconnected, the undervoltage signal received by the controlled end of the first switch tube Q1 is the battery voltage of high level, the first switch tube Q1 is disconnected under the action of the high level signal, and a first protection signal is output and is a low level signal.

It should be noted that, when the battery is in the normal voltage value range, the first voltage regulator tube U1 is turned on, the voltage of the controlled end of the first switch tube Q1 is grounded by the first voltage regulator tube U1, that is, the controlled end of the first switch tube Q1 is a low-level conduction voltage, the first switch tube Q1 is turned on under the action of the conduction voltage, and then the voltage received by the trigger module is the voltage of the battery BAT, that is, a high-level and non-low-level first protection signal.

In a specific implementation, the first switch tube Q1 may adopt a PNP type triode or a P-channel MOS transistor to turn off when receiving the under-voltage signal.

Fig. 5 is a schematic diagram illustrating a fifth battery protection circuit according to an embodiment. As shown in fig. 5, the overvoltage detection module 120 includes at least the following components based on fig. 1.

And the input end of the second sampling unit 121 is connected with the battery, and is used for sampling the battery and outputting an overvoltage signal when the voltage of the battery is greater than or equal to the overvoltage protection threshold value.

And the second switching unit 122, the second switching unit 122 is connected between the battery and the trigger module 130, a controlled end of the second switching unit 122 is connected with an output end of the second sampling unit 121, and the controlled end of the second switching unit 122 is turned on when receiving the overvoltage signal to output a second protection signal.

In the embodiment of the present application, the second sampling unit 121 samples the battery, and outputs an overvoltage signal when the battery is in overvoltage, so as to control the second switch unit 122 to be turned off, so as to output the second protection signal.

Fig. 6 is a schematic diagram illustrating a sixth battery protection circuit according to an embodiment. As shown in fig. 6, on the basis of fig. 5, the second sampling unit 121 includes at least the following parts.

And a first end of the fourth resistor R4 is connected with the battery.

And a first end of the fifth resistor R5 is connected with a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded.

A reference electrode of the second voltage-regulator tube U2 is connected with a second end of the fourth resistor R4, a negative electrode of the second voltage-regulator tube U2 is connected with the second switch unit 122, a positive electrode of the second voltage-regulator tube U2 is grounded, and the second voltage-regulator tube U2 is turned on when the voltage of the battery is greater than or equal to the overvoltage protection threshold value to output an overvoltage signal.

In the embodiment of the application, the battery is divided by the fourth resistor R4 and the fifth resistor R5, when the battery is in overvoltage, the voltage of the first end of the fifth resistor R5 is greater than or equal to the conduction voltage of the second voltage regulator tube U2, the second voltage regulator tube U2 is conducted, and an overvoltage signal, namely the conduction voltage of the second voltage regulator tube U2, is output.

It should be noted that when the battery is in a normal voltage range or under-voltage, the voltage at the first end of the fifth resistor R5 is smaller than the turn-on voltage of the second voltage-regulator tube U2, the second voltage-regulator tube U2 is turned off, the negative electrode of the second voltage-regulator tube U2 is in a high resistance state, and at this time, an overvoltage signal is not output, so that the battery can be activated.

Assuming that the overvoltage protection threshold is Umax, the resistance values of the fourth resistor R4 and the fifth resistor R5 are R4 and R5, respectively, and the conduction voltage of the second regulator tube U2 is U2. In a specific implementation, the resistance relationship may be obtained by providing the fourth resistor R4 and the fifth resistor R5 such that the fourth resistor R4 and the fifth resistor R5 satisfy the following relationship.

Fig. 7 is a schematic diagram illustrating a seventh battery protection circuit according to an embodiment. As shown in fig. 7, on the basis of fig. 6, the second switching unit 122 includes at least the following parts.

And a controlled end of the second switch tube Q2 is connected with a negative electrode of a second voltage regulator tube U2, a first end of the second switch tube Q2 is connected with the battery, and the controlled end of the second switch tube Q2 is conducted when receiving an overvoltage signal.

And the sixth resistor R6, the sixth resistor R6 is connected between the controlled end of the second switching tube Q2 and the first end of the controlled end of the second switching tube Q2.

And a first end of the seventh resistor R7 is connected with a second end of the second switching tube Q2.

A controlled end of the third switching tube Q3 is connected to the second end of the seventh resistor R7, a first end of the third switching tube Q3 is connected to the trigger module 130, and a second end of the third switching tube Q3 is grounded and is turned on when the second switching tube Q3 is turned on to output a second protection signal.

And an eighth resistor R8, wherein the eighth resistor R8 is connected between the controlled terminal of the third switching tube Q3 and the second terminal of the third switching tube Q3.

When the battery is in overvoltage, the second voltage-regulator tube U2 is conducted, the controlled end of the second switch tube Q2 is grounded, the second switch tube Q2 is conducted, and at the moment, a loop formed by the battery, the sixth resistor R6 and the second voltage-regulator tube U2 is conducted. The overvoltage signal received by the controlled end of the second switch tube Q2 is the ground voltage, i.e. low level, when the second voltage regulator tube U2 is turned on, and the second switch tube Q2 is turned on under the action of the turn-on voltage.

The second switching tube Q2 is turned on, and the seventh resistor R7 and the eighth resistor R8 divide the voltage of the battery, so that the controlled terminal voltage of the third switching tube Q3 is at a high level, the third switching tube Q3 is turned on, the voltage of the first terminal of the third switching tube Q3 is pulled down, and a second protection signal is output, and the second protection signal is at a low level.

Correspondingly, when the battery is in a normal voltage value range or under-voltage, the second voltage-stabilizing tube U2 is cut off, the controlled terminal voltage of the second switch tube Q2 is a high-level battery voltage, the second switch tube Q2 is cut off, the controlled terminal voltage of the third switch tube Q3 is a low-level signal, the third switch tube Q3 is cut off, and at the moment, the second protection signal is not output.

In a specific implementation, the second switch Q2 may be a PNP transistor or a P-channel MOS transistor for conducting when receiving the overvoltage signal, and the third switch Q3 may be an NPN transistor or an N-channel MOS transistor for conducting when the second switch Q2 is conducting.

Fig. 8 is a schematic diagram illustrating a structure of an eighth battery protection circuit according to an embodiment. As shown in fig. 8, the trigger module 130 includes at least the following components based on fig. 1.

A ninth resistor R9, a first end of the ninth resistor R9 is connected to the output end of the under-voltage detection circuit 110, and a second end of the ninth resistor R9 is connected to the output end of the over-voltage detection circuit 120.

And when the controlled end of the fourth switching tube Q4 receives the first protection signal or the second protection signal, the fourth switching tube Q4 is triggered to be disconnected, so that the transmission circuit of the activation signal is disconnected.

And a tenth resistor R10, wherein the tenth resistor R10 is connected between the controlled terminal of the fourth switching tube Q4 and the second terminal of the fourth switching tube Q4.

When the battery is under-voltage or over-voltage and the controlled end of the fourth switching tube Q4 receives the first protection signal or the second protection signal, the fourth switching tube Q4 is triggered to be disconnected, and therefore the transmission circuit of the activation signal is disconnected; correspondingly, when the battery is in a normal voltage range, the fourth switching tube Q4 is turned on, and the transmission circuit of the activation signal can normally transmit the activation signal.

In a specific implementation, the fourth switching transistor Q4 may adopt an NPN type triode or an N-channel MOS transistor to turn off when receiving the first protection signal or the second protection signal.

Fig. 9 is a schematic diagram illustrating a ninth battery protection circuit according to an embodiment. As shown in fig. 9, the battery protection circuit at least includes an undervoltage detection module 110, an overvoltage detection module 120, and a trigger module 130.

The structure of the undervoltage detection module 110 is the same as the undervoltage detection module 110 shown in fig. 4, and is not described herein again.

The structure of the overvoltage detection module 120 is the same as the structure of the overvoltage detection module 120 shown in fig. 7, and is not described herein again.

The structure of the trigger module 130 is the same as the structure of the trigger module 130 shown in fig. 8. Further, a first end of the ninth resistor R9 is connected to the second end of the first switching tube Q1, and a second end of the ninth resistor R9 is connected to the first end of the third switching tube Q3.

When the battery is under-voltage, the voltage of the first end of the second resistor R2 is smaller than the breakover voltage of the first voltage-regulator tube U1, the first voltage-regulator tube U1 is cut off, the negative electrode of the first voltage-regulator tube U1 is in a high resistance state, and an under-voltage signal is output. The undervoltage signal received by the controlled end of the first switch tube Q1 is the battery voltage of high level, and the first switch tube Q1 is disconnected under the action of the high level signal to output a first protection signal of low level. The fourth switch tube Q4 is turned off under the action of the low level signal, so as to disconnect the transmission circuit of the activation signal.

When the battery is under-voltage or in a normal voltage value range, the voltage of the first end of the fifth resistor R5 is smaller than the conduction voltage of the second voltage-regulator tube U2, the second voltage-regulator tube U2 is cut off, and the negative electrode of the second voltage-regulator tube U2 is in a high-resistance state. The controlled terminal voltage of the second switching tube Q2 is a high-level battery voltage, the second switching tube Q2 is disconnected, the controlled terminal voltage of the third switching tube Q3 is a low-level signal, the third switching tube Q3 is cut off, and at this time, the second protection signal is not output.

When the battery is in a normal voltage value range, the voltage of the first end of the second resistor R2 is larger than or equal to the conduction voltage of the first voltage-regulator tube U1, and the first voltage-regulator tube U1 is conducted. The controlled terminal voltage of the first switch tube Q1 is the low-level conducting voltage of the first voltage-stabilizing tube U1, the first switch tube Q1 is conducted under the action of the conducting voltage, the ninth resistor R9 and the tenth resistor R10 divide the voltage of the battery, so that the controlled terminal voltage of the fourth switch tube Q4 is high level, the fourth switch tube Q4 is conducted, and the transmission circuit of the activation signal is conducted.

When the battery is in overvoltage, the voltage of the first end of the fifth resistor R5 is larger than or equal to the conduction voltage of the second voltage-regulator tube U2, the second voltage-regulator tube U2 is conducted, and an overvoltage signal is output, namely the conduction voltage of the second voltage-regulator tube U2. The overvoltage signal received by the controlled end of the second switch tube Q2 is a second voltage regulator tube U2 conduction voltage, and the second switch tube Q2 is conducted under the action of the conduction voltage. The seventh resistor R7 and the eighth resistor R8 divide the voltage of the battery, so that the controlled terminal voltage of the third switching tube Q3 is at a high level, the third switching tube Q3 is turned on, the voltage of the first terminal of the third switching tube Q3 is pulled down, and the second protection signal at a low level is output. The controlled end of the fourth switching tube Q4 is disconnected under the action of the low-level signal, so that the transmission circuit of the activation signal is disconnected.

The embodiment of the application detects through undervoltage and excessive pressure to the battery, when the battery is undervoltage or excessive pressure, breaks off the transmission circuit of activation signal, avoids activating the problem that the battery influences its life when the battery is excessive pressure or undervoltage, realizes the function of protection battery when the battery is undervoltage or excessive pressure.

Fig. 10 is a schematic diagram illustrating a structure of a discharge circuit of the first battery according to an embodiment. As shown in fig. 10, the discharge circuit includes at least the following portions.

And the input end of the activation circuit 210 is connected with the battery through the activation key, and when the activation key S1 is pressed, the input end of the activation circuit 210 generates an activation signal and transmits the activation signal to the output end.

The input end of the electric energy output circuit 220 is connected with the battery, the output end of the electric energy output circuit 220 is connected with the discharge management module, the controlled end of the electric energy output circuit 220 is connected with the output end of the activation circuit 210, and the controlled end of the electric energy output circuit 220 is connected with the input end and the output end of the electric energy output circuit 220 when receiving the activation signal.

The battery protection circuit 230, the battery protection circuit 230 is the battery protection circuit shown in any of the above embodiments, the trigger module of the battery protection circuit 230 is connected to the controlled end of the activation circuit, and when the voltage of the battery is under-voltage or over-voltage, the trigger module triggers the activation circuit to be disconnected, so that the power output circuit 220 cannot receive the activation signal.

When the battery is in a normal voltage range, a user can generate an activation signal through an activation key in the form of a physical hard key or a soft key and the like, the activation signal can be transmitted to the electric energy output circuit by the activation circuit, the electric energy output circuit is conducted after receiving the activation signal, and the battery can release electric energy.

The discharge circuit of battery of this application embodiment, when the battery is under-voltage or excessive pressure, through battery protection circuit disconnection activation circuit, avoid activating the problem that the battery influences its life when the battery is excessive pressure or under-voltage, realize the function of protection battery when the battery is under-voltage or excessive pressure.

Fig. 11 is a schematic diagram illustrating a discharge circuit of a second battery according to an embodiment. As shown in fig. 11, based on fig. 10, the activation circuit 210 includes:

and a controlled end of the fifth switching tube Q5 is connected with the trigger module, a first end of the fifth switching tube Q5 is connected with the activation key S1, and the fifth switching tube Q5 is disconnected when the battery is under-voltage or overvoltage.

The sixth switching tube Q6, the controlled end of the sixth switching tube Q6 is connected to the second end of the fifth switching tube Q5, the first end of the sixth switching tube Q6 is grounded, and the sixth switching tube Q6 is disconnected when the fifth switching tube Q5 is disconnected.

The power output circuit 220 includes:

and a controlled end of the seventh switching tube Q7 is connected with a second end of the sixth switching tube Q6, a first end of the seventh switching tube Q7 is connected with the battery, a second end of the seventh switching tube Q7 is connected with the battery management system, and the seventh switching tube Q7 is disconnected when the sixth switching tube Q6 is disconnected, so as to prevent the battery from discharging through the discharge tube management module.

When the battery is under-voltage or overvoltage, the fifth switching tube Q5 is disconnected under the action of the trigger module, the sixth switching tube Q6 is disconnected therewith, the seventh switching tube Q7 is disconnected, and the electric energy output circuit 1020 is disconnected; when the battery is in the normal voltage range, the fifth switching tube Q5 is turned on under the action of the trigger module, the sixth switching tube Q6 is turned on therewith, the seventh switching tube Q7 is turned on, and the electric energy output circuit 1020 is turned on.

In a specific implementation, the fifth switching tube Q5 may adopt a PNP type triode or a P-channel MOS transistor, the sixth switching tube Q6 may adopt an NPN type triode or an N-channel MOS transistor, and the seventh switching tube Q7 may adopt a PNP type triode or a P-channel MOS transistor, so as to be turned off when the first protection signal or the second protection signal is received.

Fig. 12 is a schematic diagram illustrating a discharge circuit of a third battery according to an embodiment. As shown in fig. 12, the battery protection circuit 230 is a battery protection circuit shown in fig. 9 on the basis of fig. 9 and 11.

The activation circuit 210 further includes:

and the eleventh resistor R11 is connected between the first end of the fourth switching tube Q4 and the controlled end of the fifth switching tube Q5.

And the twelfth resistor R12 is connected between the activation button S1 and the second end of the fifth switching tube Q5.

And the thirteenth resistor R13 is connected between the controlled end and the second end of the fifth switching tube Q5.

And a first end of the first capacitor C1 is connected with a second end of the fifth switching tube Q5, and a second end of the first capacitor C is grounded for filtering.

And a first end of the second capacitor C2 is connected with a first end of the fifth switching tube Q5, and a second end of the second capacitor C is grounded and used for filtering.

The fourteenth resistor R14, the first voltage stabilizing diode D1 and the fifteenth resistor R15 are sequentially connected in series between the first end of the fifth switch tube Q5 and the controlled end of the sixth switch tube Q6, wherein the anode of the first diode D1 is close to the direction of the controlled end of the sixth switch tube Q6, and the cathode of the first diode D1 is close to the direction of the first end of the fifth switch tube Q5.

And the sixteenth resistor R16 is connected between the controlled terminal of the sixth switching tube Q6 and the second terminal of the sixth switching tube Q6.

And a seventeenth resistor R17 connected between the second end of the sixth switching tube Q6 and the controlled end of the seventh switching tube Q7.

The power output circuit 220 further includes:

the eighteenth resistor R18 and the third capacitor C3 are connected between the controlled end and the first end of the seventh switch Q7.

The nineteenth resistor R19, the second diode D2, and the twentieth resistor R20 are sequentially connected in series between the second end of the seventh switching tube Q7 and the battery management system, wherein the anode of the second diode D2 is close to the second end of the seventh switching tube Q7, and the cathode of the second diode D2 is close to the battery management system.

A first end of the fourth capacitor C4 is connected between the nineteenth resistor R19 and the second diode D2, and a second end thereof is grounded.

A fifth capacitor C5, having a first end connected between the twentieth resistor R20 and the battery management system, and a second end connected to ground.

When the battery is under-voltage or over-voltage, the fourth switching tube Q4 is disconnected, the fifth switching tube Q5 is disconnected, the sixth switching tube Q6 is disconnected, the seventh switching tube Q7 is disconnected, and the battery cannot discharge through the battery management system; when the battery is in the normal voltage range, the fourth switch tube Q4 is conducted, the fifth switch tube Q5 is conducted, the sixth switch tube Q6 is conducted therewith, the first voltage stabilizing diode D1 is subjected to one-way breakdown, the seventh switch tube Q7 is conducted, and the battery can be discharged through the battery management system.

In specific implementation, the fifth switching tube Q5 may adopt a PNP-type triode or a P-channel MOS tube, the sixth switching tube Q6 may adopt an NPN-type triode or an N-channel MOS tube, and the seventh switching tube Q7 adopts a PNP-type triode or a P-channel MOS tube.

The discharge circuit of battery of this application embodiment, when the battery is under-voltage or excessive pressure, through battery protection circuit disconnection activation circuit, avoid activating the problem that the battery influences its life when battery excessive pressure or under-voltage, realize the function of protection battery when battery is under-voltage or excessive pressure.

The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not limitations of the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A battery protection circuit, wherein a power output circuit of a battery is turned on when receiving an activation signal, so that the battery outputs an electrical signal, the battery protection circuit comprising:

2. The battery protection circuit of claim 1, wherein the brown-out detection module comprises:

3. The battery protection circuit of claim 2, wherein the first sampling unit comprises:

4. The battery protection circuit of claim 3, wherein the first switching unit comprises:

the controlled end of the first switch tube is connected with the negative electrode of the first voltage-stabilizing tube and the second end of the third resistor respectively, the first end of the first switch tube is connected with the battery, the second end of the first switch tube is connected with the trigger module, and the first switch tube is disconnected when the controlled end of the first switch tube receives the undervoltage signal so as to output the first protection signal.

5. The battery protection circuit of claim 1, wherein the over-voltage detection module comprises:

6. The battery protection circuit of claim 5, wherein the second sampling unit comprises:

and a reference electrode of the second voltage-regulator tube is connected with the second end of the fourth resistor, a negative electrode of the second voltage-regulator tube is connected with the second switch unit, and a positive electrode of the second voltage-regulator tube is grounded.

7. The battery protection circuit of claim 6, wherein the second switching unit comprises:

a first end of the seventh resistor is connected with the second end of the second switch tube;

and a first end of the eighth resistor is connected with the second end of the seventh resistor, and a second end of the eighth resistor is grounded.

8. The battery protection circuit of claim 1, wherein the trigger module comprises:

a first end of the ninth resistor is connected with the output end of the undervoltage detection circuit, and a second end of the ninth resistor is connected with the output end of the overvoltage detection circuit;

a controlled end of the fourth switching tube is connected with a second end of the ninth resistor, the second end of the fourth switching tube is grounded, and when the controlled end of the fourth switching tube receives the first protection signal or the second protection signal, the fourth switching tube is triggered to be disconnected, so that a transmission circuit of an activation signal is disconnected;

9. A discharge circuit for a battery, the discharge circuit comprising:

the battery protection circuit as claimed in any one of claims 1 to 8, wherein a trigger module of the battery protection circuit is connected to a controlled end of the activation circuit, and when the voltage of the battery is under-voltage or over-voltage, the trigger module triggers the activation circuit to be disconnected, so that an electric energy output circuit where the battery is located cannot receive the activation signal.

10. The battery discharge circuit of claim 9, wherein the activation circuit comprises:

the electric power output circuit includes:

and a controlled end of the seventh switching tube is connected with a second end of the sixth switching tube, a first end of the seventh switching tube is connected with the battery, a second end of the seventh switching tube is connected with a battery management system, and the seventh switching tube is disconnected when the sixth switching tube is disconnected so as to prevent the battery from discharging through the discharge management module.