Protection circuit, battery and electronic equipment

Abstract

The utility model relates to the technical field of battery protection, in particular to a protection circuit, a battery and electronic equipment, the protection circuit comprises a first protection module, a second protection module, a first connecting piece and a second connecting piece, and the first protection module and the second protection module are both used for being connected with a battery cell. The first protection module is connected with the first connecting piece, and the first connecting piece and the first protection module are located on the first side. The second connecting piece is connected with the second protection module, and the second connecting piece and the second protection module are located on the second side. The first side and the second side are two opposite sides. According to the invention, the occupied space can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery protection technology, and in particular to a protection circuit, battery, and electronic device. Background Technology

[0002] A battery is an energy component used to supply power, which transmits electrical energy by forming an electrical connection with other electrical devices.

[0003] A battery generally consists of a protection circuit and a battery cell. The protection circuit is used to disconnect the battery cell in time when there is a tendency for the battery cell to be overcharged or over-discharged, so as to prevent the battery cell from failing due to overcharging or over-discharging.

[0004] In related technologies, batteries generally have multiple connectors. The connectors enable current transmission between the protection circuit and other electrical components. The protection circuit forms an electrical connection with each connector, so the wiring is often quite complex, resulting in the battery cell head needing to occupy a lot of space. Utility Model Content

[0005] In view of this, this application provides a protection circuit, battery, and electronic device to reduce the space occupied.

[0006] Specifically, the following technical solutions are included:

[0007] A first aspect of this application provides a protection circuit, the protection circuit including a first protection module, a second protection module, a first connector, and a second connector, wherein...

[0008] Both the first protection module and the second protection module are used to connect to the battery cell.

[0009] The first protection module is connected to the first connector, and the first connector and the first protection module are located on the first side.

[0010] The second connector is connected to the second protection module, and the second connector and the second protection module are located on the second side.

[0011] The first side and the second side are opposite sides.

[0012] Optionally, the first protection module includes a first protection chip and a first MOS switch. A first pin of the first protection chip is connected to a first terminal of a first resistor, a second terminal of the first resistor is connected to a first terminal of a first capacitor, a second pin of the first protection chip is connected to a second terminal of the first capacitor, and a third pin of the first protection chip is connected to the first MOS switch. The first terminal of the first protection chip (MOS) switch is connected to the first terminal of the first protection chip. The fourth pin of the first protection chip is connected to the second terminal of the first MOS switch. The fifth pin of the first protection chip is connected to the first terminal of the second resistor. The second terminal of the second resistor and the third terminal of the first MOS switch are both connected to the first connector. The sixth pin of the first protection chip and the fourth terminal of the first MOS switch are both connected to the first terminal of the first precision resistor. The second terminal of the first precision resistor is connected to the second pin of the first protection chip. And / or, the second protection module includes a second protection chip and a second MOS switch. The first pin of the second protection chip is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the first terminal of the second capacitor. The second pin of the second protection chip is connected to the second terminal of the second capacitor. The third pin of the second protection chip is connected to the first terminal of the second MOS switch. The fourth pin of the second protection chip is connected to the second terminal of the second MOS switch. The fifth pin of the second protection chip is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor and the third terminal of the second MOS switch are both connected to the second connector. The sixth pin of the second protection chip and the fourth terminal of the second MOS switch are both connected to the first terminal of the second precision resistor. The second terminal of the second precision resistor is connected to the second pin of the second protection chip.

[0013] Optionally, the first protection module includes a third protection chip and a third MOS switch. The first pin of the third protection chip is connected to the first terminal of a fifth resistor. The second terminal of the fifth resistor is connected to the first terminal of a third capacitor. The second pin of the third protection chip is connected to the second terminal of the third capacitor. The third pin of the third protection chip is connected to the first terminal of the third MOS switch. The fourth pin of the third protection chip is connected to the second terminal of the third MOS switch. The fifth pin of the third protection chip is connected to the first terminal of a sixth resistor. The second terminal of the sixth resistor and the third terminal of the third MOS switch are both connected to the fourth terminal of the first MOS switch. The sixth pin of the third protection chip and the fourth terminal of the third MOS switch are both connected to the first terminal of a first precision resistor. The second terminal of the first precision resistor is connected to the second pin of the third protection chip. And / or, the second protection module includes a fourth protection chip and a fourth MOS switch. The first pin of the fourth protection chip is connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is connected to the first terminal of the fourth capacitor, the second pin of the fourth protection chip is connected to the second terminal of the fourth capacitor, the third pin of the fourth protection chip is connected to the first terminal of the fourth MOS switch, the fourth pin of the fourth protection chip is connected to the second terminal of the fourth MOS switch, the fifth pin of the fourth protection chip is connected to the first terminal of the eighth resistor, the second terminal of the eighth resistor and the third terminal of the fourth MOS switch are both connected to the fourth terminal of the second MOS switch, the sixth pin of the fourth protection chip and the fourth terminal of the fourth MOS switch are both connected to the first terminal of the second precision resistor, and the second terminal of the second precision resistor is connected to the second pin of the fourth protection chip.

[0014] Optionally, the protection circuit includes a fifth protection chip, a fifth MOS switch, and a sixth MOS switch. The first pin of the fifth protection chip is connected to the first terminal of a ninth resistor. The second terminal of the ninth resistor is connected to the first terminal of a fifth capacitor. The second terminal of the fifth capacitor and the first terminal of the third precision resistor are both connected to the second pin of the fifth protection chip. The third pin of the fifth protection chip is connected to the first terminal of the fifth MOS switch and the first terminal of the sixth MOS switch, respectively. The fourth pin of the fifth protection chip is connected to the second terminal of the fifth MOS switch and the second terminal of the sixth MOS switch, respectively. The fifth pin of the fifth protection chip is connected to the first terminal of a tenth resistor. The second terminal of the tenth resistor is connected to the third terminal of the fifth MOS switch. The third terminal of the fifth MOS switch is connected to the second terminal of the first precision resistor. The third terminal of the sixth MOS switch is connected to the second terminal of the second precision resistor. The fourth terminals of the fifth MOS switch and the sixth MOS switch are both connected to the second terminal of the third precision resistor.

[0015] Optionally, the protection circuit includes a first fuse and a second fuse, wherein the first fuse is connected to the first protection module and the second fuse is connected to the second protection module.

[0016] Optionally, the protection circuit includes a power monitoring module for connection to the battery cell, and the power monitoring module is connected to at least one of the first connector, the second connector, the first protection module, and the second protection module.

[0017] Optionally, the power monitoring module includes a first fuel gauge chip. The first pin of the first fuel gauge chip is connected to the first end of the eleventh resistor. The second pin of the first fuel gauge chip is connected to the first end of the twelfth resistor. The third pin of the first fuel gauge chip is connected to a first temperature sensor. The fourth pin of the first fuel gauge chip is connected to the first end of the thirteenth resistor. The fifth pin of the first fuel gauge chip is connected to the first end of the fourteenth resistor. The first ends of the thirteenth resistor and the fourteenth resistor are connected through a sixth capacitor. The sixth pin of the first fuel gauge chip is grounded. The seventh pin of the first fuel gauge chip is connected to the first end of the seventh capacitor. The eighth pin of the first fuel gauge chip is connected to the seventh pin of the first fuel gauge chip and the first end of the fifteenth resistor, respectively. The ninth pin of the first fuel gauge chip is connected to the first end of the eighth capacitor and the first end of the sixteenth resistor, respectively.

[0018] Optionally, the power monitoring module includes a second fuel gauge chip, a seventh MOS switch, and an eighth MOS switch. The first pin of the second fuel gauge chip is connected to the first end of the seventeenth resistor, the second pin of the second fuel gauge chip is connected to the first end of the eighteenth resistor, the third pin of the second fuel gauge chip is connected to the second temperature sensor, the fourth pin of the second fuel gauge chip is connected to the first end of the nineteenth resistor, the fifth pin of the second fuel gauge chip is connected to the first end of the twentieth resistor, the first ends of the nineteenth resistor and the twentieth resistor are connected through a ninth capacitor, the sixth pin of the second fuel gauge chip is grounded, the seventh pin of the second fuel gauge chip is connected to the first end of the tenth capacitor, the eighth pin of the second fuel gauge chip is connected to the seventh pin of the second fuel gauge chip and the first end of the twenty-first resistor, the ninth pin of the second fuel gauge chip is connected to the first ends of the seventh MOS switch and the eighth MOS switch, the tenth pin of the second fuel gauge chip is connected to the second end of the seventh MOS switch, the second end of the eighth MOS switch, and the first end of the twenty-second resistor, the tenth pin of the second fuel gauge chip is connected to the first end of the twenty-third resistor, and the second end of the twenty-second resistor is connected to the second end of the twenty-third resistor.

[0019] A second aspect of this application provides a battery that includes the protection circuit described above.

[0020] Optionally, the battery includes a circuit board and a battery cell, with the first connector and the second connector located at opposite ends of the circuit board, and one side of the circuit board connected to the battery cell.

[0021] Optionally, the battery cell has tabs, and the battery includes nickel plates located between the tabs and the circuit board, and connected to both the tabs and the circuit board respectively.

[0022] Optionally, the first connector and the first protection module are located on opposite sides of the circuit board, and / or the second connector and the second protection module are located on opposite sides of the circuit board.

[0023] A third aspect of this application provides an electronic device comprising a battery as described in the above technical solutions.

[0024] The beneficial effects of the technical solution provided in this application include at least the following: the first connector and the second connector enable the protection circuit to form an electrical connection with other electrical devices, thereby realizing the transmission of current. The first protection module and the second protection module are respectively connected to the battery cell, and can independently realize the transmission of electrical energy through the first connector and the second connector. Since the first protection module and the second protection module are located on the first side and the second side respectively, on the one hand, the wiring complexity of the circuit board can be reduced, which helps to avoid the use of a double-layer circuit board scheme to realize the electrical connection of the first connector and the second connector to the battery cell. This helps to reduce the space occupied by the head of the battery cell. On the other hand, the protection circuit is decentralized and modularized, which helps to avoid the unnecessary space waste caused by the accumulation of its components occupying the space at the head of the battery cell. Therefore, it can further reduce the space occupied at the head of the battery cell. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A circuit diagram of the first type of protection circuit provided in the embodiments of this application;

[0027] Figure 2 A circuit diagram of the first protection module provided in the embodiments of this application;

[0028] Figure 3 A circuit diagram of the second protection module provided in the embodiments of this application;

[0029] Figure 4 A circuit diagram of the second protection circuit provided in the embodiments of this application;

[0030] Figure 5 A circuit diagram of the third protection circuit provided in the embodiments of this application;

[0031] Figure 6 A circuit diagram of a first type of power monitoring module provided in the embodiments of this application;

[0032] Figure 7 A circuit diagram of the fourth protection circuit provided in the embodiments of this application;

[0033] Figure 8 A circuit diagram of a second power monitoring module provided in an embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the circuit board structure provided in an embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the battery structure provided in an embodiment of this application.

[0036] The reference numerals in the figure indicate:

[0037] 1. First protection module; 11. First protection chip; R1. First resistor; C1. First capacitor; R2. Second resistor; 12. First MOS switch; 13. Third protection chip; R5. Fifth resistor; C3. Third capacitor; R6. Sixth resistor; 14. Third MOS switch;

[0038] 2. Second protection module; 21. Second protection chip; R3. Third resistor; C2. Second capacitor; R4. Fourth resistor; 22. Second MOS switch; 23. Fourth protection chip; R7. Seventh resistor; C4. Fourth capacitor; R8. Eighth resistor; 24. Fourth MOS switch;

[0039] 3. First connector;

[0040] 4. Second connector;

[0041] 51. Fifth protection chip; R9. Ninth resistor; C5. Fifth capacitor; R10. Tenth resistor; 52. Fifth MOS switch; 53. Sixth MOS switch;

[0042] 6. Power monitoring module; 61. First power meter chip; R11. Eleventh resistor; R12. Twelfth resistor; R13. Thirteenth resistor; R14. Fourteenth resistor; C6. Sixth capacitor; C7. Seventh capacitor; R15. Fifteenth resistor; C8. Eighth capacitor; R16. Sixteenth resistor; 611. First temperature sensor;

[0043] 63. Second fuel gauge chip; R17, seventeenth resistor; R18, eighteenth resistor; R19, nineteenth resistor; R20, twentieth resistor; C9, ninth capacitor; C10, tenth capacitor; R21, twenty-first resistor; R22, twenty-second resistor; R23, twenty-third resistor; 631. Second temperature sensor; 64. Seventh MOS switch; 65. Eighth MOS switch;

[0044] 71. Circuit board; 72. Battery cell; 721. Electrode; 73. Nickel sheet;

[0045] 81. First fuse; 82. Second fuse.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0049] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0050] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0051] The first aspect of this application provides a protection circuit, such as Figure 1 As shown, the protection circuit includes a first protection module 1, a second protection module 2, a first connector 3, and a second connector 4, wherein...

[0052] Both the first protection module 1 and the second protection module 2 are used to connect to the battery cell 72.

[0053] The first protection module 1 is connected to the first connector 3, and the first connector 3 and the first protection module 1 are located on the first side.

[0054] The second connector 4 is connected to the second protection module 2, and the second connector 4 and the second protection module 2 are located on the second side.

[0055] The first side and the second side are opposite sides.

[0056] It is understandable that the first connector 3 and the second connector 4 enable the protection circuit to form an electrical connection with other electrical components, thereby achieving current transmission. The first protection module 1 and the second protection module 2 are respectively connected to the battery cell 72, and can independently achieve power transmission through the first connector 3 and the second connector 4. Since the first protection module 1 and the second protection module 2 are located on the first side and the second side respectively, on the one hand, the wiring complexity of the circuit board 71 can be reduced, which helps to avoid using a double-layer circuit board 71 to achieve the electrical connection of the first connector 3 and the second connector 4 to the battery cell 72. This helps to reduce the space occupied by the head of the battery cell 72. On the other hand, the protection circuit is decentralized and modularized, which helps to avoid the unnecessary space waste caused by the accumulation of its components occupying the space at the head of the battery cell 72. Therefore, it can further reduce the space occupied by the head of the battery cell 72.

[0057] In this embodiment of the application, the main function of the first connector 3 and the second connector 4 is to realize the charging and discharging of the battery cell 72. The first connector 3 and the second connector 4 need to be protected by the first protection module 1 and the second protection module 2 to avoid the battery cell 72 from being overcharged or over-discharged, which would lead to a decrease in lifespan or even damage.

[0058] Since the first connector 3 and the first protection module 1 are located on the first side, while the second connector 4 and the second protection module 2 are located on the second side, the heat generated by the first protection module 1 and the second protection module 2 during operation can be dispersed, which helps to avoid heat accumulation.

[0059] Meanwhile, the first protection module 1 and the second protection module 2 are independent of each other, and there is no need to consider the positional relationship between them when wiring, which also helps to reduce the difficulty of wiring.

[0060] In addition, compared to the case where the first connector 3 and the second connector 4 share a protection module, the first protection module 1 and the second protection module 2 are relatively small in size and are distributed on both sides, which can avoid the protection modules from piling up at the head of the battery cell 72. This helps to reduce the occupation of the head of the battery cell 72 by a single protection module with a large size.

[0061] In some embodiments of this application, such as Figure 1 and Figure 2As shown, the first protection module 1 includes a first protection chip 11 and a first MOS switch 12. The first pin of the first protection chip 11 is connected to the first end of the first resistor R1. The second end of the first resistor R1 is connected to the first end of the first capacitor C1. The second pin of the first protection chip 11 is connected to the second end of the first capacitor C1. The third pin of the first protection chip 11 is connected to the first end of the first MOS switch 12. The fourth pin of the first protection chip 11 is connected to the second end of the first MOS switch 12. The fifth pin of the first protection chip 11 is connected to the first end of the second resistor R2. The second end of the second resistor R2 and the third end of the first MOS switch 12 are both connected to the first connector 3. The sixth pin of the first protection chip 11 and the fourth end of the first MOS switch 12 are both connected to the first end of the first precision resistor. The second end of the first precision resistor is connected to the second pin of the first protection chip 11.

[0062] In this embodiment, the first protection chip 11 can infer whether the battery cell 72 is in an overcurrent state by monitoring the current or voltage of the first precision resistor, and protect the battery cell 72 by switching the first MOS switch 12 on and off when the battery cell 72 malfunctions. This can prevent the battery cell 72 from being overcharged or over-discharged.

[0063] In this embodiment, the second end of the first resistor R1 can be connected to the positive terminal of the battery cell 72, and the second end of the first precision resistor Rs1 is connected to the negative terminal of the battery cell 72.

[0064] In this embodiment, the first pin of the first protection chip 11 is the VDD pin, which is the positive power supply pin. The second pin of the first protection chip 11 is the VSS pin, which is the ground pin. The third pin of the first protection chip 11 is the DOUT pin, which is the discharge output pin. The fourth pin of the first protection chip 11 is the COUT pin, which is the charging output pin. The fifth pin of the first protection chip 11 is the V- pin, which is the negative power supply pin. The sixth pin of the first protection chip 11 is the CS pin, which is the power detection pin.

[0065] In this embodiment of the application, the first MOS switch 12 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first terminal and the second terminal of the first MOS switch 12, respectively, the two drains are connected, and the two sources serve as the third terminal and the fourth terminal of the first MOS switch 12, respectively.

[0066] In some embodiments of this application, such as Figure 1 and Figure 2As shown, the second protection module 2 includes a second protection chip 21 and a second MOS switch 22. The first pin of the second protection chip 21 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 second capacitor C2. The second pin of the second protection chip 21 is connected to the second end of the second capacitor C2. The third pin of the second protection chip 21 is connected to the first end of the second MOS switch 22. The fourth pin of the second protection chip 21 is connected to the second end of the second MOS switch 22. The fifth pin of the second protection chip 21 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 and the third end of the second MOS switch 22 are both connected to the second connector 4. The sixth pin of the second protection chip 21 and the fourth end of the second MOS switch 22 are both connected to the first end of the second precision resistor. The second end of the second precision resistor is connected to the second pin of the second protection chip 21.

[0067] In this embodiment, the second protection chip 21 can infer whether the battery cell 72 is in an overcurrent state by monitoring the current or voltage of the second precision resistor, and protect the battery cell 72 by switching the second MOS switch 22 on and off when the battery cell 72 malfunctions. This can prevent the battery cell 72 from being overcharged or over-discharged.

[0068] In this embodiment, the second end of the third resistor R3 can be connected to the positive terminal of the battery cell 72, and the second end of the second precision resistor Rs2 is connected to the negative terminal of the battery cell 72.

[0069] In this embodiment, the first pin of the second protection chip 21 is the VDD pin, which is the positive power supply pin. The second pin of the second protection chip 21 is the VSS pin, which is the ground pin. The third pin of the second protection chip 21 is the DOUT pin, which is the discharge output pin. The fourth pin of the second protection chip 21 is the COUT pin, which is the charging output pin. The fifth pin of the second protection chip 21 is the V- pin, which is the negative power supply pin. The sixth pin of the second protection chip 21 is the CS pin, which is the power detection pin.

[0070] In this embodiment of the application, the second MOS switch 22 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the second MOS switch 22, respectively, the two drains are connected, and the two sources serve as the third and fourth terminals of the second MOS switch 22, respectively.

[0071] In some embodiments of this application, such as Figure 1 and Figure 2As shown, the first protection module 1 includes a first protection chip 11 and a first MOS switch 12. The first pin of the first protection chip 11 is connected to the first terminal of a first resistor R1; the second terminal of the first resistor R1 is connected to the first terminal of a first capacitor C1; the second pin of the first protection chip 11 is connected to the second terminal of the first capacitor C1; the third pin of the first protection chip 11 is connected to the first terminal of the first MOS switch 12; the fourth pin of the first protection chip 11 is connected to the second terminal of the first MOS switch 12; the fifth pin of the first protection chip 11 is connected to the first terminal of a second resistor R2; the second terminal of the second resistor R2 and the third terminal of the first MOS switch 12 are both connected to a first connector 3; the sixth pin of the first protection chip 11 and the fourth terminal of the first MOS switch 12 are both connected to the first terminal of a first precision resistor; and the second terminal of the first precision resistor is connected to the second pin of the first protection chip 11. And / or, the second protection module 2 includes a second protection chip 21 and a second MOS switch 22. The first pin of the second protection chip 21 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 second capacitor C2. The second pin of the second protection chip 21 is connected to the second end of the second capacitor C2. The third pin of the second protection chip 21 is connected to the first end of the second MOS switch 22. The fourth pin of the second protection chip 21 is connected to the second end of the second MOS switch 22. The fifth pin of the second protection chip 21 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 and the third end of the second MOS switch 22 are both connected to the second connector 4. The sixth pin of the second protection chip 21 and the fourth end of the second MOS switch 22 are both connected to the first end of the second precision resistor. The second end of the second precision resistor is connected to the second pin of the second protection chip 21.

[0072] It is understandable that the first protection module 1 and the second protection module 2 of the above structure are small in size, which is conducive to their arrangement with the first connector 3 and the second connector 4 on the first and second sides, thus reducing the space occupied by the protection circuit.

[0073] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3As shown, the first protection module 1 includes a third protection chip 13 and a third MOS switch 14. The first pin of the third protection chip 13 is connected to the first end of the fifth resistor R5. The second end of the fifth resistor R5 is connected to the first end of the third capacitor C3. The second pin of the third protection chip 13 is connected to the second end of the third capacitor C3. The third pin of the third protection chip 13 is connected to the first end of the third MOS switch 14. The fourth pin of the third protection chip 13 is connected to the second end of the third MOS switch 14. The fifth pin of the third protection chip 13 is connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 and the third end of the third MOS switch 14 are both connected to the fourth end of the first MOS switch 12. The sixth pin of the third protection chip 13 and the fourth end of the third MOS switch 14 are both connected to the first end of the first precision resistor Rs1. The second end of the first precision resistor Rs1 is connected to the second pin of the third protection chip 13.

[0074] In this embodiment, the third protection chip 13 can infer whether the battery cell 72 is in an overcurrent state by monitoring the current or voltage of the first precision resistor, and protect the battery cell 72 by switching the third MOS switch 14 on and off when the battery cell 72 malfunctions. This can prevent the battery cell 72 from overcharging or over-discharging. Through the cooperation of the first MOS switch 12 and the third MOS switch 14, the accuracy of the first protection module 1 in monitoring the overcharging and over-discharging of the battery cell 72 is improved.

[0075] In this embodiment, the second end of the fifth resistor R5 can be connected to the positive terminal of the battery cell 72, and the second end of the first precision resistor Rs1 is connected to the negative terminal of the battery cell 72.

[0076] In this embodiment, the first pin of the third protection chip 13 is the VDD pin, which is the positive power supply pin. The second pin of the third protection chip 13 is the VSS pin, which is the ground pin. The third pin of the third protection chip 13 is the DOUT pin, which is the discharge output pin. The fourth pin of the third protection chip 13 is the COUT pin, which is the charging output pin. The fifth pin of the third protection chip 13 is the V- pin, which is the negative power supply pin. The sixth pin of the third protection chip 13 is the CS pin, which is the power detection pin.

[0077] In this embodiment of the application, the third MOS switch 14 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the third MOS switch 14, the two drains are connected, and the two sources serve as the third and fourth terminals of the third MOS switch 14, respectively.

[0078] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the second protection module 2 includes a fourth protection chip 23 and a fourth MOS switch 24. The first pin of the fourth protection chip 23 is connected to the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected to the first end of the fourth capacitor C4. The second pin of the fourth protection chip 23 is connected to the second end of the fourth capacitor C4. The third pin of the fourth protection chip 23 is connected to the first end of the fourth MOS switch 24. The fourth pin of the fourth protection chip 23 is connected to the second end of the fourth MOS switch 24. The fifth pin of the fourth protection chip 23 is connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 and the third end of the fourth MOS switch 24 are both connected to the fourth end of the second MOS switch 22. The sixth pin of the fourth protection chip 23 and the fourth end of the fourth MOS switch 24 are both connected to the first end of the second precision resistor. The second end of the second precision resistor is connected to the second pin of the fourth protection chip 23.

[0079] In this embodiment, the fourth protection chip 23 can infer whether the battery cell 72 is in an overcurrent state by monitoring the current or voltage of the second precision resistor, and protect the battery cell 72 by switching the fourth MOS switch 24 on and off when the battery cell 72 malfunctions. This can prevent the battery cell 72 from overcharging or over-discharging. Through the cooperation of the second MOS switch 22 and the fourth MOS switch 24, the accuracy of the second protection module 2 in monitoring the overcharging and over-discharging of the battery cell 72 is improved.

[0080] In this embodiment, the second end of the seventh resistor R7 can be connected to the positive terminal of the battery cell 72, and the second end of the first precision resistor Rs1 is connected to the negative terminal of the battery cell 72.

[0081] In this embodiment, the first pin of the fourth protection chip 23 is the VDD pin, which is the positive power supply pin. The second pin of the fourth protection chip 23 is the VSS pin, which is the ground pin. The third pin of the fourth protection chip 23 is the DOUT pin, which is the discharge output pin. The fourth pin of the fourth protection chip 23 is the COUT pin, which is the charging output pin. The fifth pin of the fourth protection chip 23 is the V- pin, which is the negative power supply pin. The sixth pin of the fourth protection chip 23 is the CS pin, which is the power detection pin.

[0082] In this embodiment of the application, the fourth MOS switch 24 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the fourth MOS switch 24, the two drains are connected, and the two sources serve as the third and fourth terminals of the fourth MOS switch 24, respectively.

[0083] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the first protection module 1 includes a third protection chip 13 and a third MOS switch 14. The first pin of the third protection chip 13 is connected to the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is connected to the first terminal of the third capacitor C3. The second pin of the third protection chip 13 is connected to the second terminal of the third capacitor C3. The third pin of the third protection chip 13 is connected to the first terminal of the third MOS switch 14. The fourth pin of the third protection chip 13 is connected to the second terminal of the third MOS switch 14. The fifth pin of the third protection chip 13 is connected to the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 and the third terminal of the third MOS switch 14 are both connected to the fourth terminal of the first MOS switch 12. The sixth pin of the third protection chip 13 and the fourth terminal of the third MOS switch 14 are both connected to the first terminal of the first precision resistor. The second terminal of the first precision resistor is connected to the second pin of the third protection chip 13. The second protection module 2 includes a fourth protection chip 23 and a fourth MOS switch 24. The first pin of the fourth protection chip 23 is connected to the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected to the first end of the fourth capacitor C4. The second pin of the fourth protection chip 23 is connected to the second end of the fourth capacitor C4. The third pin of the fourth protection chip 23 is connected to the first end of the fourth MOS switch 24. The fourth pin of the fourth protection chip 23 is connected to the second end of the fourth MOS switch 24. The fifth pin of the fourth protection chip 23 is connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 and the third end of the fourth MOS switch 24 are both connected to the fourth end of the second MOS switch 22. The sixth pin of the fourth protection chip 23 and the fourth end of the fourth MOS switch 24 are both connected to the first end of the second precision resistor Rs2. The second end of the second precision resistor Rs2 is connected to the second pin of the fourth protection chip 23.

[0084] It is understandable that the first protection module 1 and the second protection module 2 of the above structure are small in size, which is conducive to their arrangement with the first connector 3 and the second connector 4 on the first and second sides, thus reducing the space occupied by the protection circuit.

[0085] In some embodiments of this application, such as Figure 4As shown, the protection circuit includes a fifth protection chip 51, a fifth MOS switch 52, and a sixth MOS switch 53. The first pin of the fifth protection chip 51 is connected to the first end of the ninth resistor R9. The second end of the ninth resistor R9 is connected to the first end of the fifth capacitor C5. The second end of the fifth capacitor C5 and the first end of the third precision resistor are both connected to the second pin of the fifth protection chip 51. The third pin of the fifth protection chip 51 is connected to the first end of the fifth MOS switch 52 and the first end of the sixth MOS switch 53, respectively. The fourth pin of the fifth protection chip 51 is connected to the second end of the fifth MOS switch 52 and the second end of the sixth MOS switch 53, respectively. The fifth pin of the fifth protection chip 51 is connected to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is connected to the third end of the fifth MOS switch 52. The third end of the fifth MOS switch 52 is connected to the second end of the first precision resistor Rs1. The third end of the sixth MOS switch 53 is connected to the second end of the second precision resistor Rs2. The fourth ends of the fifth MOS switch 52 and the sixth MOS switch 53 are both connected to the first end of the third precision resistor Rs3.

[0086] In this embodiment, the fifth protection chip 51 can infer whether the battery cell 72 is in an overcurrent state by monitoring the current or voltage of the third precision resistor. When the battery cell 72 malfunctions, it protects the battery cell 72 by switching the fifth MOS switch 52 and the sixth MOS switch 53 on and off. Through the cooperation of the fifth MOS switch 52 and the sixth MOS switch 53 with the first protection module 1 and the second protection module 2, the protection performance of the protection circuit is improved.

[0087] In this embodiment, the second end of the third precision resistor can be connected to the negative terminal of the battery cell 72, and the second end of the ninth resistor R9 is connected to the positive terminal of the battery cell 72.

[0088] In this embodiment, the first pin of the fifth protection chip 51 is the VDD pin, which is the positive power supply pin. The second pin of the fourth protection chip 23 is the VSS pin, which is the ground pin. The third pin of the fourth protection chip 23 is the DOUT pin, which is the discharge output pin. The fourth pin of the fourth protection chip 23 is the COUT pin, which is the charging output pin. The fifth pin of the fourth protection chip 23 is the V- pin, which is the negative power supply pin. The sixth pin of the fourth protection chip 23 is the CS pin, which is the power detection pin.

[0089] In this embodiment of the application, the fifth MOS switch 52 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the fourth MOS switch 24, respectively, the two drains are connected, and the two sources serve as the third and fourth terminals of the fourth MOS switch 24, respectively.

[0090] In this embodiment, the sixth MOS switch 53 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the fourth MOS switch 24, respectively, the two drains are connected, and the two sources serve as the third and fourth terminals of the fourth MOS switch 24, respectively.

[0091] In some embodiments of this application, such as Figure 5 As shown, the protection circuit includes a first fuse 81 and a second fuse 82. The first fuse 81 is connected to the first protection module 1, and the second fuse 82 is connected to the second protection module 2.

[0092] It is understandable that when the charging current of the battery cell 72 is too high, if the first protection module 1 and the second protection module 2 cannot protect the battery cell 72 in time, the first fuse 81 and the second fuse 82 can disconnect the current by melting, thus reducing the possibility of the battery cell 72 exploding due to overcharging.

[0093] In some embodiments of this application, such as Figure 5 As shown, the protection circuit includes a power monitoring module 6, which is connected to the battery cell 72. The power monitoring module 6 is connected to at least one of the first connector 3, the second connector 4, the first protection module 1, and the second protection module 2.

[0094] Understandably, the power monitoring module 6 can obtain information about the remaining power of the battery cell 72 and provide feedback to the user. The power monitoring module 6 is connected to at least one of the first connector 3, the second connector 4, the first protection module 1, and the second protection module 2, and can obtain information about the remaining power of the battery cell 72 through any of the above.

[0095] In this embodiment, the power monitoring module 6 can be connected to the first connector 3, or to the second connector 4, or to the first protection module 1, or to the second protection module 2.

[0096] In this embodiment, the power monitoring module 6 can be connected between the first connector 3 and the first protection module 1, or between the second connector 4 and the second protection module 2.

[0097] In some embodiments of this application, such as Figure 5 and Figure 6As shown, the power monitoring module 6 includes a first power meter chip 61. The first pin of the first power meter chip 61 is connected to the first end of the eleventh resistor R11. The second pin of the first power meter chip 61 is connected to the first end of the twelfth resistor R12. The third pin of the first power meter chip 61 is connected to the first temperature sensor 611. The fourth pin of the first power meter chip 61 is connected to the first end of the thirteenth resistor R13. The fifth pin of the first power meter chip 61 is connected to the first end of the fourteenth resistor R14. The first ends of the thirteenth resistor R13 and the fourteenth resistor R14 are connected through a sixth capacitor C6. The sixth pin of the first power meter chip 61 is grounded. The seventh pin of the first power meter chip 61 is connected to the first end of the seventh capacitor C7. The eighth pin of the first power meter chip 61 is connected to the seventh pin of the first power meter chip 61 and the first end of the fifteenth resistor R15, respectively. The ninth pin of the first power meter chip 61 is connected to the first end of the eighth capacitor C8 and the first end of the sixteenth resistor R16, respectively.

[0098] It is understandable that the second end of the sixteenth resistor R16 and the second end of the fifteenth resistor R15 can be connected between the second connector 4 and the positive terminal of the battery cell 72. The second end of the seventh capacitor C7 and the second end of the thirteenth resistor R13 can be connected to the negative terminal of the battery cell 72 through the fourth precision resistor Rs4. In this way, the power of the battery cell 72 can be monitored through the fourth precision resistor Rs4.

[0099] In this embodiment, the first pin of the first fuel gauge chip 61 is the SDA / HDQ pin, which is used for data communication; the second pin is the SCL pin, which serves as the communication clock terminal; the third pin is the TS pin, which is used for temperature acquisition; the fourth pin is the SRN pin, which serves as the enable terminal; the fifth pin is the SRP pin, which serves as the enable terminal; the sixth pin is the VSS pin, which serves as the ground terminal; the seventh pin is the BAT_SNS pin, which serves as the cell 72 detection terminal; the eighth pin is the CE pin, which serves as the enable terminal; the ninth pin is the BAT pin, which serves as the positive power supply terminal; and the tenth pin is the INT pin, which serves as the input terminal.

[0100] In some embodiments of this application, such as Figure 7 and Figure 8As shown, the power monitoring module 6 includes a second fuel gauge chip 63, a seventh MOS switch 64, and an eighth MOS switch 65. The first pin of the second fuel gauge chip 63 is connected to the first terminal of the seventeenth resistor R17; the second pin of the second fuel gauge chip 63 is connected to the first terminal of the eighteenth resistor R18; the third pin of the second fuel gauge chip 63 is connected to the second temperature sensor 631; the fourth pin of the second fuel gauge chip 63 is connected to the first terminal of the nineteenth resistor R19; the fifth pin of the second fuel gauge chip 63 is connected to the first terminal of the twentieth resistor R20; the first terminals of the nineteenth resistor R19 and the twentieth resistor R20 are connected through a ninth capacitor C9; and the sixth pin of the second fuel gauge chip 63 is grounded. The seventh pin of the second fuel gauge chip 63 is connected to the first terminal of the tenth capacitor C10. The eighth pin of the second fuel gauge chip 63 is connected to the seventh pin of the second fuel gauge chip 63 and the first terminal of the twenty-first resistor R21, respectively. The ninth pin of the second fuel gauge chip 63 is connected to the first terminal of the seventh MOS switch 64 and the first terminal of the eighth MOS switch 65, respectively. The tenth pin of the second fuel gauge chip 63 is connected to the second terminal of the seventh MOS switch 64, the second terminal of the eighth MOS switch 65, and the first terminal of the twenty-second resistor R22, respectively. The tenth pin of the second fuel gauge chip 63 is connected to the first terminal of the twenty-third resistor R23, and the second terminal of the twenty-second resistor R22 is connected to the second terminal of the twenty-third resistor R23.

[0101] Understandably, the third terminal of the eighth MOS switch 65 can be connected to the first connector 3, the third terminal of the ninth MOS switch can be connected to the second connector 4, the second terminal of the twenty-first resistor R21, the fourth terminal of the eighth MOS switch 65 and the fourth terminal of the ninth MOS switch can be connected to the positive terminal of the battery cell 72, the second terminal of the twenty-second resistor R22 is connected between the first connector 3 and the eighth MOS switch 65, and the second terminal of the nineteenth resistor R19 and the second terminal of the tenth capacitor C10 can be connected to the negative terminal of the battery cell 72 through a precision resistor. In this way, the charge of the battery cell 72 can be monitored through a precision resistor.

[0102] In this embodiment, the first pin of the second fuel gauge chip 63 is the SDA / HDQ pin, which is used for data communication; the second pin is the SCL pin, which serves as the communication clock terminal; the third pin is the TS pin, which is used for temperature acquisition; the fourth pin is the SRN pin, which serves as the enable terminal; the fifth pin is the SRP pin, which serves as the enable terminal; the sixth pin is the VSS pin, which serves as the ground terminal; the seventh pin is the VDD pin, which is the positive terminal of the power supply; the eighth pin is the BAT pin, which is the positive terminal of the power supply; and the ninth and tenth pins are INT pins, which serve as input terminals.

[0103] In this embodiment, the eighth MOS switch 65 includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the fourth MOS switch 24, respectively, the two drains are connected, and the two sources serve as the third and fourth terminals of the fourth MOS switch 24, respectively.

[0104] In this embodiment of the application, the ninth MOS switch includes two N-channel MOS transistors, wherein the two gates of the two N-channel MOS transistors serve as the first and second terminals of the fourth MOS switch 24, respectively, the two drains are connected, and the two sources serve as the third and fourth terminals of the fourth MOS switch 24, respectively.

[0105] A second aspect of this application provides a battery that includes a protection circuit as described above.

[0106] It is understood that, due to the use of the protection circuit in the above embodiments, the battery of this application has the same technical effects as the above embodiments, and will not be described again here.

[0107] In some embodiments of this application, such as Figure 9 As shown, the battery includes a circuit board 71 and a battery cell 72. The first connector 3 and the second connector 4 are located at both ends of the circuit board 71, and one side of the circuit board 71 is connected to the battery cell 72.

[0108] Logically, the first connector 3 and the second connector 4 located at both ends of the circuit board 71 are far apart. Therefore, the heat generated by the first connector 3 working with the first protection module 1 and the heat generated by the second connector 4 working with the second protection module 2 can be dissipated to the outside through the air, which helps to improve the heat dissipation efficiency and avoid heat accumulation.

[0109] In some embodiments of this application, such as Figure 10 As shown, the battery cell 72 has a tab 721, and the battery includes a nickel plate 73, which is located between the tab 721 and the circuit board 71 and is connected to the tab 721 and the circuit board 71 respectively.

[0110] Understandably, tab 721 serves as the channel for electrons to transfer from cell 72 outwards. During this electron transfer process, heat is easily generated, causing expansion. Nickel sheet 73 can be soldered to tab 721 to maintain a certain connection and improve the stability of the above process.

[0111] In some embodiments of this application, such as Figure 9 As shown, the first connector 3 and the first protection module 1 are located on opposite sides of the circuit board 71.

[0112] Understandably, to avoid contact between the circuit board 71 and other components, both sides of the circuit board 71 are generally suspended during the arrangement. Therefore, this arrangement helps to improve the structural compactness of the battery and reduce the space occupied.

[0113] In some embodiments of this application, such as Figure 9 As shown, the second connector 4 and the second protection module 2 are located on opposite sides of the circuit board 71.

[0114] Understandably, to avoid contact between the circuit board 71 and other components, both sides of the circuit board 71 are generally suspended during the arrangement. Therefore, this arrangement helps to improve the structural compactness of the battery and reduce the space occupied.

[0115] In this embodiment, the first connector 3 and the first protection module 1 are located on opposite sides of the circuit board 71.

[0116] A third aspect of this application provides an electronic device, which includes a battery as described above.

[0117] It is understood that, due to the use of the battery in the above embodiments, the electronic device of this application has the same technical effects as the above embodiments, and will not be described again here.

[0118] In the embodiments of this application, the electronic device can be a mobile phone, tablet computer, or other similar product.

[0119] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0120] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0121] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A protection circuit, characterized in that, The protection circuit includes a first protection module (1), a second protection module (2), a first connector (3), and a second connector (4), wherein, Both the first protection module (1) and the second protection module (2) are used to connect to the battery cell (72); The first protection module (1) is connected to the first connector (3). The first connector (3) and the first protection module (1) are respectively placed on opposite sides of the circuit board (71) of the battery. The first connector (3) and the first protection module (1) are located on the first side. The second connector (4) is connected to the second protection module (2). The second connector (4) and the second protection module (2) are respectively placed on opposite sides of the circuit board (71). The second connector (4) and the second protection module (2) are located on the second side. The first side and the second side are opposite sides.

2. The protection circuit according to claim 1, characterized in that, The first protection module (1) includes a first protection chip (11) and a first MOS switch (12). The first pin of the first protection chip (11) is connected to the first end of the first resistor (R1), the second end of the first resistor (R1) is connected to the first end of the first capacitor (C1), the second pin of the first protection chip (11) is connected to the second end of the first capacitor (C1), the third pin of the first protection chip (11) is connected to the first end of the first MOS switch (12), the fourth pin of the first protection chip (11) is connected to the second end of the first MOS switch (12), the fifth pin of the first protection chip (11) is connected to the first end of the second resistor (R2), the second end of the second resistor (R2) and the third end of the first MOS switch (12) are both connected to the first connector (3), the sixth pin of the first protection chip (11) and the fourth end of the first MOS switch (12) are both connected to the first end of the first precision resistor (Rs1), and the second end of the first precision resistor (Rs1) is connected to the second pin of the first protection chip (11). And / or, The second protection module (2) includes a second protection chip (21) and a second MOS switch (22). The first pin of the second protection chip (21) 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 second capacitor (C2). The second pin of the second protection chip (21) is connected to the second end of the second capacitor (C2). The third pin of the second protection chip (21) is connected to the first end of the second MOS switch (22). The fourth pin of the second protection chip (21) is connected to the second end of the second MOS switch (22). The fifth pin of the second protection chip (21) is connected to the first end of the fourth resistor (R4). The second end of the fourth resistor (R4) and the third end of the second MOS switch (22) are both connected to the second connector (4). The sixth pin of the second protection chip (21) and the fourth end of the second MOS switch (22) are both connected to the first end of the second precision resistor (Rs2). The second end of the second precision resistor (Rs2) is connected to the second pin of the second protection chip (21).

3. The protection circuit according to claim 2, characterized in that, The first protection module (1) includes a third protection chip (13) and a third MOS switch (14). The first pin of the third protection chip (13) is connected to the first terminal of the fifth resistor (R5), the second terminal of the fifth resistor (R5) is connected to the first terminal of the third capacitor (C3), the second pin of the third protection chip (13) is connected to the second terminal of the third capacitor (C3), the third pin of the third protection chip (13) is connected to the first terminal of the third MOS switch (14), and the fourth pin of the third protection chip (13) is connected to the third MOS switch (14). The second terminal of switch (14) is connected, the fifth pin of the third protection chip (13) is connected to the first terminal of the sixth resistor (R6), the second terminal of the sixth resistor (R6) is connected to the third terminal of the third MOS switch (14), and both are connected to the fourth terminal of the first MOS switch (12). The sixth pin of the third protection chip (13) and the fourth terminal of the third MOS switch (14) are both connected to the first terminal of the first precision resistor (Rs1), and the second terminal of the first precision resistor (Rs1) is connected to the second pin of the third protection chip (13). And / or, The second protection module (2) includes a fourth protection chip (23) and a fourth MOS switch (24). The first pin of the fourth protection chip (23) is connected to the first terminal of the seventh resistor (R7), the second terminal of the seventh resistor (R7) is connected to the first terminal of the fourth capacitor (C4), the second pin of the fourth protection chip (23) is connected to the second terminal of the fourth capacitor (C4), the third pin of the fourth protection chip (23) is connected to the first terminal of the fourth MOS switch (24), and the fourth pin of the fourth protection chip (23) is connected to the first terminal of the fourth MOS switch (24). The second terminal of the S switch (24) is connected, the fifth pin of the fourth protection chip (23) is connected to the first terminal of the eighth resistor (R8), the second terminal of the eighth resistor (R8) and the third terminal of the fourth MOS switch (24) are both connected to the fourth terminal of the second MOS switch (22), the sixth pin of the fourth protection chip (23) and the fourth terminal of the fourth MOS switch (24) are both connected to the first terminal of the second precision resistor (Rs2), and the second terminal of the second precision resistor (Rs2) is connected to the second pin of the fourth protection chip (23).

4. The protection circuit according to claim 2, characterized in that, The protection circuit includes a fifth protection chip (51), a fifth MOS switch (52), and a sixth MOS switch (53). The first pin of the fifth protection chip (51) is connected to the first terminal of the ninth resistor (R9), the second terminal of the ninth resistor (R9) is connected to the first terminal of the fifth capacitor (C5), the second terminal of the fifth capacitor (C5) and the first terminal of the third precision resistor (Rs3) are both connected to the second pin of the fifth protection chip (51), the third pin of the fifth protection chip (51) and the first terminal of the fifth MOS switch (52) are both connected to the first terminal of the sixth MOS switch (53), and the fourth pin of the fifth protection chip (51) is connected to the first terminal of the sixth MOS switch (53). The second terminal of each MOS switch (52) is connected to the second terminal of the sixth MOS switch (53). The fifth pin of the fifth protection chip (51) is connected to the first terminal of the tenth resistor (R10). The second terminal of the tenth resistor (R10) is connected to the third terminal of the fifth MOS switch (52). The third terminal of the fifth MOS switch (52) is connected to the second terminal of the first precision resistor (Rs1). The third terminal of the sixth MOS switch (53) is connected to the second terminal of the second precision resistor (Rs2). The fourth terminals of both the fifth MOS switch (52) and the sixth MOS switch (53) are connected to the second terminal of the third precision resistor (Rs3).

5. The protection circuit according to claim 1, characterized in that, The protection circuit includes a first fuse (81) and a second fuse (82). The first fuse (81) is connected to the first protection module (1), and the second fuse (82) is connected to the second protection module (2).

6. The protection circuit according to claim 1, characterized in that, The protection circuit includes a power monitoring module (6), which is used to connect to the battery cell (72). The power monitoring module (6) is connected to at least one of the first connector (3), the second connector (4), the first protection module (1), and the second protection module (2).

7. The protection circuit according to claim 6, characterized in that, The power monitoring module (6) includes a first power meter chip (61). The first pin of the first power meter chip (61) is connected to the first end of the eleventh resistor (R11), the second pin of the first power meter chip (61) is connected to the first end of the twelfth resistor (R12), the third pin of the first power meter chip (61) is connected to the first temperature sensor (611), the fourth pin of the first power meter chip (61) is connected to the first end of the thirteenth resistor (R13), and the fifth pin of the first power meter chip (61) is connected to the first end of the fourteenth resistor (R14). The first end of the thirteenth resistor (R13) and the first end of the fourteenth resistor (R14) are connected through the sixth capacitor (C6). The sixth pin of the first fuel gauge chip (61) is grounded. The seventh pin of the first fuel gauge chip (61) is connected to the first end of the seventh capacitor (C7). The eighth pin of the first fuel gauge chip (61) is connected to the seventh pin of the first fuel gauge chip (61) and the first end of the fifteenth resistor (R15) respectively. The ninth pin of the first fuel gauge chip (61) is connected to the first end of the eighth capacitor (C8) and the first end of the sixteenth resistor (R16) respectively.

8. The protection circuit according to claim 6, characterized in that, The power monitoring module (6) includes a second power meter chip (63), a seventh MOS switch (64), and an eighth MOS switch (65). The first pin of the second power meter chip (63) is connected to the first end of the seventeenth resistor (R17), the second pin of the second power meter chip (63) is connected to the first end of the eighteenth resistor (R18), the third pin of the second power meter chip (63) is connected to the second temperature sensor (631), the fourth pin of the second power meter chip (63) is connected to the first end of the nineteenth resistor (R19), the fifth pin of the second power meter chip (63) is connected to the first end of the twentieth resistor (R20), the first ends of the nineteenth resistor (R19) and the twentieth resistor (R20) are connected through the ninth capacitor (C9), and the sixth pin of the second power meter chip (63) is grounded. The seventh pin of the fuel gauge chip (63) is connected to the first end of the tenth capacitor (C10). The eighth pin of the second fuel gauge chip (63) is connected to the seventh pin of the second fuel gauge chip (63) and the first end of the twenty-first resistor (R21) respectively. The ninth pin of the second fuel gauge chip (63) is connected to the first end of the seventh MOS switch (64) and the first end of the eighth MOS switch (65) respectively. The tenth pin of the second fuel gauge chip (63) is connected to the second end of the seventh MOS switch (64), the second end of the eighth MOS switch (65), and the first end of the twenty-second resistor (R22) respectively. The tenth pin of the second fuel gauge chip (63) is connected to the first end of the twenty-third resistor (R23). The second end of the twenty-second resistor (R22) is connected to the second end of the twenty-third resistor (R23).

9. A battery, characterized in that, The battery includes the protection circuit as described in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that, The battery includes a circuit board (71) and a battery cell (72). The first connector (3) and the second connector (4) are located at both ends of the circuit board (71), and one side of the circuit board (71) is connected to the battery cell (72).

11. The battery according to claim 10, characterized in that, The cell (72) has a tab (721), and the battery includes a nickel plate (73) located between the tab (721) and the circuit board (71), and connected to the tab (721) and the circuit board (71) respectively.

12. An electronic device, characterized in that, The electronic device includes a battery as described in any one of claims 9 to 11.

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