Battery protection circuit, battery protection board and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery protection circuit, a battery protection board and a battery, the battery protection circuit comprises a positive pole main line circuit and a negative pole main line circuit, the positive pole main line circuit comprises a battery protection device, or the negative pole main line circuit comprises a battery protection device; the anode main line circuit comprises a first connector, and the first connector is used for being connected with an anode power supply end of a battery cell through a power line; the cathode main line circuit comprises a second connector, and the second connector is used for being connected with a cathode power supply end of the battery cell through a power line; the first connector and the second connector are connected through a preset line, and the through-current capability of the preset line is smaller than that of the power line. The problem of temperature rise caused by large internal resistance of the battery protection plate in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technology field, concretely relates to a battery protection circuit, battery protection board and battery. BACKGROUND

[0002] With the development of science and technology, the fast charging battery of terminal equipment such as mobile phone is widely used.

[0003] At present, in order to improve the current carrying capacity, two connectors are used for the protection circuit board of fast charging battery such as mobile phone, thereby increasing the power line, leading to the internal resistance of battery protection board is big, thereby leading to the temperature rise of battery protection board. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a battery protection circuit, battery protection board and battery to solve the internal resistance of battery protection board is big in prior art, leading to the temperature rise problem.

[0005] Firstly, the utility model provides a battery protection circuit, and the battery protection circuit includes: positive pole main line circuit and negative pole main line circuit;

[0006] The positive pole main line circuit includes a first connector, and the first connector is used to be connected with the positive pole power supply end of the battery cell through the power line;

[0007] The negative pole main line circuit includes a second connector, and the second connector is used to be connected with the negative pole power supply end of the battery cell through the power line;

[0008] The first connector and the second connector are connected through a preset line, and the current carrying capacity of the preset line is less than that of the power line.

[0009] The utility model provides a battery protection circuit, the first connector is connected with the positive pole power supply end of the battery cell through the power line, and the negative pole main line circuit is connected with the negative pole power supply end of the battery cell through the power line, so that the power line flowing through the positive pole power supply end of the battery cell and the power line flowing through the negative pole power supply end of the battery cell are separated, and the first connector and the second connector are only connected through the preset line, compared with the connection between the two connectors of the traditional power line, the preset line of the utility model can pass through small current, and the length of the connecting line between the first connector and the second connector is reduced, and the internal resistance of the battery protection board is reduced to a great extent, and the temperature rise problem is solved.

[0010] In an alternative embodiment, the ports of the first connector are all first positive pole ports, the first positive pole ports are connected with the positive pole power supply end of the battery cell through the power line, and the first positive pole ports are connected with the second connector based on the preset line.

[0011] In an alternative embodiment, the negative main line circuit comprises a battery protection device.

[0012] The ports of the second connector comprise a second positive port and a second negative port, the second negative port is connected to the negative power terminal of the battery cell through the power line and the battery protection device, and the second positive port is connected to the first positive port through the preset line, and the second positive port is connected to the battery protection device.

[0013] In an alternative embodiment, the battery protection device comprises a switch tube and a test resistor.

[0014] The second negative port is connected to the negative power terminal of the battery cell through the power line, the switch tube and the test resistor.

[0015] In an alternative embodiment, the ports of the second connector are all third negative ports, the third negative ports are connected to the negative power terminal of the battery cell based on the power line, and the third negative ports are connected to the first connector based on the preset line.

[0016] In an alternative embodiment, the positive main line circuit comprises a battery protection device.

[0017] The ports of the first connector comprise a fourth positive port and a fourth negative port, the fourth positive port is connected to the positive power terminal of the battery cell through the power line and the battery protection device, the fourth positive port is connected to the third negative port through the preset line, and the fourth negative port is connected to the battery protection device.

[0018] In an alternative embodiment, the battery protection device comprises a switch tube and a test resistor.

[0019] The fourth positive port is connected to the positive power terminal of the battery cell through the power line, the switch tube and the test resistor.

[0020] In an alternative embodiment, the circuit further comprises a current-limiting resistor.

[0021] The current-limiting resistor is arranged in the positive main line circuit, a first end of the current-limiting resistor is connected to the second connector through the preset line, and a second end of the current-limiting resistor is connected to the first connector; or,

[0022] The current-limiting resistor is arranged in the negative main line circuit, a first end of the current-limiting resistor is connected to the first connector through the preset line, and a second end of the current-limiting resistor is connected to the second connector.

[0023] In a second aspect, the utility model provides a kind of battery protection board, and battery protection board includes above battery protection circuit, and battery protection board includes: positive circuit board and negative circuit board;

[0024] The positive main line circuit is integrated on the positive circuit board, and the negative main line circuit is integrated on the negative circuit board.

[0025] In an alternative embodiment, the battery protection circuit is adapted to be connected with a mainboard of the terminal device, the mainboard comprising a first fastening area and a second fastening area;

[0026] The positive electrode circuit board is fastened and connected with the first fastening area, and the negative electrode circuit board is fastened and connected with the second fastening area.

[0027] In an alternative embodiment, the preset wire is arranged on the mainboard of the terminal device.

[0028] In a third aspect, the utility model provides a battery, the battery comprises the battery protection board as above. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0030] Figure 1 It is a conventional battery protection circuit;

[0031] Figure 2 It is a battery protection circuit structural diagram according to the embodiment of the utility model;

[0032] Figure 3 It is a battery protection circuit detailed structure diagram according to the embodiment of the utility model;

[0033] Figure 4 It is another battery protection circuit detailed structure diagram according to the embodiment of the utility model;

[0034] Figure 5 It is still another battery protection circuit detailed structure diagram according to the embodiment of the utility model;

[0035] Figure 6 It is still another battery protection circuit detailed structure diagram according to the embodiment of the utility model;

[0036] Figure 7 It is a battery protection board structure diagram according to the embodiment of the utility model.

[0037] Reference Signs:

[0038] 10, positive main circuit; 20, negative main circuit; J1, first connector; J2, second connector; K, preset line; B+, positive power supply end; B-, negative power supply end; P1+ first positive port; P2+, second positive port; P2-, second negative port; P3-, third negative port; P4+, fourth positive port; P4-, fourth negative port; R0, test resistance; Q1, first switch tube; Q2, second switch tube; U2, second controller; U1, first controller; R1, first resistance; R2, second resistance; R3, third resistance; R4, fourth resistance; R5, fifth resistance; R6, current limiting resistance; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; RT1, battery temperature sensor; TVS, transient voltage suppression diode; A, positive circuit board; B, negative circuit board. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements, it can be wireless connection, or it can be wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0043] With the development of science and technology, fast charging batteries of terminal devices such as mobile phones are widely used. Figure 1 In order to improve the current-carrying capacity, the protection circuit board of the mobile phone fast charging battery uses two connectors, which are connected in parallel between the two connectors, thereby increasing the power supply line, resulting in a large internal resistance of the battery protection board, thereby causing the temperature of the battery protection board to rise.

[0044] To this end, the present embodiment provides a battery protection circuit, as shown in Figure 2 The battery protection circuit comprises a positive main line circuit 10 and a negative main line circuit 20.

[0045] The positive main line circuit 10 comprises a first connector J1, which is used to connect with the positive power terminal B+ of the battery cell through a power line.

[0046] Specifically, the power line is a power main line led out from the positive and negative poles of the battery cell CELL, which comprises a positive power line and a negative power line, and is represented by a thick line in Figure 2 The first connector J1 is only connected with the positive power terminal B+ of the battery cell CELL, and the positive main line circuit 10 comprises the positive power line in the battery protection circuit and can also comprise protection components connected with the positive power line. The first connector J1 is a connector for connecting the battery and the main board of the terminal device. The terminal device includes electronic devices such as mobile phones or computers, which are not limited here. Optionally, the positive main line circuit 10 is a positive wiring circuit module in the battery protection circuit.

[0047] The negative main line circuit 20 comprises a second connector J2, which is used to connect with the negative power terminal B- of the battery cell through a power line.

[0048] Specifically, the second connector J2 is only connected with the negative power terminal B- of the battery cell, and the negative main line circuit 20 comprises the negative power line in the battery protection circuit and can also comprise protection components connected with the negative power line. Optionally, the negative main line circuit 20 is a negative wiring circuit module in the battery protection circuit.

[0049] The first connector J1 and the second connector J2 are connected through a preset line K, wherein the current carrying capacity of the preset line K is less than that of the power line.

[0050] Specifically, the preset line K is a connector between the positive electrode and the negative electrode, that is, the preset line K can be a line leading the positive electrode voltage from the first connector J1 to the second connector J2, or a line leading the negative electrode voltage from the second connector J2 to the first connector J1. If the positive electrode main line circuit 10 includes a protection device, the preset line K leads the negative electrode voltage from the second connector J2 to the first connector J1 to provide the negative electrode voltage to the negative electrode terminal of the protection device; if the negative electrode main line circuit 20 includes a protection device, the preset line K leads the positive electrode voltage from the first connector J1 to the second connector J2 to provide the positive electrode voltage to the positive electrode terminal of the protection device. The second connector J2 is a connector of the battery and the mobile phone mainboard. It should be understood that the preset line is a signal line for providing positive and negative electrode signals, and the preset line K can pass through a small current compared to a power line, thereby reducing the internal resistance. It is worth noting that the part of the method involved in the embodiment is a mature method of the prior art.

[0051] The utility model provides a kind of battery protection circuit, the first connector is connected with the positive electrode power terminal of electric core by power line, and the negative electrode main line circuit is connected with the negative electrode power terminal of electric core by power line, to separate the power line that flows through the positive electrode power terminal of electric core, and the power line that flows through the negative electrode power terminal of electric core, and, only by preset line is connected between the first connector and the second connector, compared with the connection between the two connectors of traditional power line, the preset line of the utility model can pass through small current, simultaneously, the length of the connecting line between the first connector and the second connector is reduced, further, the internal resistance of battery protection board is greatly reduced, and the problem of temperature rise is solved.

[0052] In some optional embodiments, as shown in Figure 3 The port of the first connector J1 is all the first positive electrode port P1+, and the first positive electrode port P1+ is connected with the positive electrode power terminal B+ of electric core by power line, and the first positive electrode port P1+ is connected with the second connector J2 based on preset line K.

[0053] Specifically, referring to Figure 3 The 10 ports of the first connector J1 are all defined as the first positive electrode port P1+, that is, the positive electrode power terminal B+ of electric core is connected with the first positive electrode port P1+ of 1 to 10 ports respectively.

[0054] In some optional embodiments, the negative electrode main line circuit 20 includes: a battery protection device;

[0055] The port of the second connector J2 includes the second positive electrode port P2+ and the second negative electrode port P2-, the second negative electrode port P2- is connected with the negative electrode power terminal B- of electric core by power line through battery protection device, the second positive electrode port P2+ is connected with the first positive electrode port P1+ by preset line, and the second positive electrode port P2+ is connected with battery protection device.

[0056] Specifically, referring to Figure 3 , the ports of the second connector J2 include a second positive port P2+ and a second negative port P2-. The 9th port, the 8th port, the 1st port, the 10th port, the 4th port and the 5th port of the second connector J2 are defined as the second negative port P2-, the 6th port of the second connector J2 is an NTC (Negative Temperature Coefficient thermistor) port, which is connected with the host to enable the host to monitor the temperature of the battery, the 2nd port of the second connector J2 is an ID (Identity document) port, which is connected with the host to enable the host to identify the model of the battery. The 3rd port and the 7th port of the second connector J2 are defined as the second positive port P2+, wherein the 7th port is a reserved port of the second positive port P2+. It is to be understood that the number of ports of the second positive port P2+ and the second negative port P2- in the second connector J2 can be changed according to actual conditions.

[0057] In some optional embodiments, as shown in Figure 3 , the battery protection device includes a switch tube (i.e., a first switch tube Q1 and a second switch tube Q2) and a test resistor R0;

[0058] The second negative port P2- is connected with the negative power end B- of the battery cell through the power line, the switch tube and the test resistor R0.

[0059] Referring to Figure 3 , the switch tube and the test resistor R0 are connected on the negative power line, at this time, all the battery protection devices are arranged in the negative main line circuit 20, and the first connector J1 in the positive main line circuit 10 transmits the positive voltage to the second connector J2 through the preset line K. Compared with the conventional mode of connecting the first connector and the second connector through the power line, the length of the connecting line between the first connector and the second connector is greatly reduced, and in turn, the internal resistance of the battery protection board is greatly reduced, and the problem of temperature rise is solved.

[0060] The battery protection device includes a primary protection device and a secondary protection device. The primary protection device includes a second controller U2, a third resistor R3, a fourth resistor R4, a third capacitor C3 and a second switch tube Q2. The secondary protection device includes a first controller U1, a first resistor R1, a second resistor R2, a first capacitor C1 and a first switch tube Q1. The battery protection device further includes a battery temperature sensor RT1, a fifth resistor R5 and a transient voltage suppression diode TVS.

[0061] The test resistor R0 is a precision resistor, which is used to detect abnormal charging and abnormal discharging to protect the mainboard of the battery protection device. The second controller U2 is a primary protection circuit master device, which detects the voltage change of the battery through the first resistor R1 and the second resistor R2, and detects the input and output current through the test resistor R0. When there is abnormal charging and abnormal discharging, the second switch tube Q2 is controlled to shut down the output and input. The first controller U1 is a secondary protection circuit master device, which detects the input and output current through the test resistor R0, that is, sends the current signal to the first controller U1 and the second controller U2 through the VINI port respectively. When there is abnormal charging and abnormal discharging, the first switch tube Q1 is controlled to shut down the output and input. The first capacitor C1 and the third capacitor C3 are working bypass filter capacitors. The second resistor R2 and the fourth resistor R4 are battery abnormal application removal detection resistors, and the first resistor R1 and the third resistor R3 are battery voltage detection samples. The first resistor R1 is a power supply resistor for the first controller U1, and the third resistor R3 is a power supply resistor for the second controller U2. The fifth resistor R5 is a battery identification resistor, and the host recognizes the model of the battery through the fifth resistor R5. The transient voltage suppression diode TVS is an input protection ESD (Electro-Static discharge) device. The host monitors the temperature of the battery through the battery temperature sensor RT1.

[0062] In some optional embodiments, as shown in Figure 4 The ports of the second connector J2 are all third negative ports P3-, which are connected to the negative power end B- of the battery based on the power line, and are connected to the first connector J1 based on the preset line K.

[0063] Specifically, referring to Figure 4 The 10 ports of the second connector J2 are all defined as third negative ports P3-, that is, the negative power end B- of the battery is connected to the third negative ports P3- of the 1 to 10 ports.

[0064] In some optional embodiments, the positive main line circuit 10 includes a battery protection device.

[0065] The ports of the first connector J1 include a fourth positive port P4+ and a fourth negative port P4-. The fourth positive port P4+ is connected to the positive power end B+ of the battery through the power line and the battery protection device. The fourth negative port P4- is connected to the third negative port P3- through the preset line K, and is connected to the battery protection device.

[0066] It should be noted that the fourth negative port P4- provides a ground signal for the battery protection device.

[0067] Specifically, referring to Figure 4The ports of the first connector J1 include a fourth positive port P4+ and a fourth negative port P4-. The 9th port, the 8th port, the 1st port, the 10th port, the 4th port and the 5th port of the first connector J1 are defined as the fourth positive port P4+, the 6th port of the first connector J1 is an NTC (Negative Temperature Coefficient thermistor) port, which is connected to the host computer to enable the host computer to monitor the temperature of the battery, the 2nd port of the first connector J1 is an ID (Identity document) port, which is connected to the host computer to enable the host computer to identify the model of the battery, the 3rd port and the 7th port of the first connector J1 are defined as the fourth negative port P4-, and the 7th port is a reserved port of the fourth negative port P4-. It should be understood that the number of the fourth positive port P4+ and the fourth negative port P4- in the first connector J1 can be changed according to actual conditions.

[0068] In some optional embodiments, as shown in Figure 4 , the battery protection device includes a switch tube (i.e., a first switch tube Q1 and a second switch tube Q2) and a test resistor R0.

[0069] The fourth positive port P4+ is connected to the positive power terminal B+ of the battery cell through the power line, the switch tube and the test resistor R0.

[0070] Referring to Figure 4 , the switch tube is connected to the test resistor R0 on the positive power line, at this time, all the battery protection devices are arranged in the positive main line circuit 10, and the second connector J2 in the negative main line circuit 20 transmits the negative voltage to the first connector J1 through the preset line K. Compared with the conventional connection mode between the first connector and the second connector through the power line, the length of the connection line between the first connector and the second connector is greatly reduced, and the internal resistance of the battery protection board is greatly reduced, thereby solving the problem of temperature rise. In addition, the battery protection device further includes a second capacitor C2, a fourth capacitor C4 and a fifth capacitor C5, and the second capacitor C2, the fourth capacitor C4 and the fifth capacitor C5 are used as working bypass filter capacitors.

[0071] In some optional embodiments, as shown in Figure 3 and Figure 6 , the battery protection circuit further includes a current-limiting resistor R6.

[0072] The current-limiting resistor R6 is arranged in the positive main line circuit 10, the first end of the current-limiting resistor R6 is connected to the second connector J2 through the preset line K, and the second end of the current-limiting resistor R6 is connected to the first connector J1.

[0073] Specifically, the current-limiting resistor R6 functions to limit the current between the positive electrode and the negative electrode, i.e., to limit the short-circuit current on the preset line when the positive electrode power terminal B+ and the negative electrode power terminal B- are short-circuited or when an abnormal short circuit occurs, thereby protecting the battery. Figure 3 and Figure 6 The current-limiting resistor R6 can be arranged in the positive electrode main line circuit 10. Alternatively, the current-limiting resistor R6 can be a plurality of resistors connected in series, in parallel, or in a combination of series and parallel.

[0074] In some alternative embodiments, as shown in Figure 4 and Figure 5 The current-limiting resistor R6 is arranged in the negative electrode main line circuit 20, the first end of the current-limiting resistor R6 is connected to the first connector J1 through the preset line K, and the second end of the current-limiting resistor R6 is connected to the second connector J2.

[0075] Specifically, referring to Figure 4 and Figure 5 The current-limiting resistor R6 can be arranged in the negative electrode main line circuit 20.

[0076] In the present embodiment, the utility model provides a battery protection board, as shown in Figure 7 The battery protection board comprises the battery protection circuit as above, and the battery protection board comprises: a positive electrode circuit board A and a negative electrode circuit board B.

[0077] The positive electrode main line circuit 10 is integrated on the positive electrode circuit board A, and the negative electrode main line circuit 20 is integrated on the negative electrode circuit board B.

[0078] Specifically, the battery protection board comprises two circuit boards, i.e., the positive electrode circuit board A and the negative electrode circuit board B, the positive electrode main line circuit 10 is arranged on the positive electrode circuit board A, and the negative electrode main line circuit 20 is arranged on the negative electrode circuit board B. Thus, the positive electrode circuit board A and the negative electrode circuit board B are only connected through the preset line K.

[0079] In some alternative embodiments, the battery protection circuit is adapted to be connected to the main board of the terminal device, and the main board comprises a first buckling area and a second buckling area.

[0080] The positive electrode circuit board A is buckled and connected to the first buckling area, and the negative electrode circuit board B is buckled and connected to the second buckling area.

[0081] Specifically, two buckling areas are arranged on the main board, i.e., the first buckling area and the second buckling area, when the battery is connected to the main board of the terminal device, the positive electrode circuit board A is buckled and connected to the first buckling area, and the negative electrode circuit board B is buckled and connected to the second buckling area.

[0082] In some alternative embodiments, the preset line K is arranged on the main board of the terminal device.

[0083] Specifically, the preset line K is arranged on the mainboard of the terminal device, so that when the positive circuit board A is not buckled in the first buckling area and / or the negative circuit board B is not buckled in the second buckling area, the positive power terminal B+ and the negative power terminal B- are not conducted, the connection of the positive power terminal B+ and the negative power terminal B- is prevented, the situation of short-circuit explosion and fire is prevented, and meanwhile, the power consumption of the battery itself is reduced when the battery is transported or the battery is not connected with the terminal device.

[0084] In the embodiment, the utility model provides a kind of battery, and battery includes above-mentioned battery protection plate, battery protection circuit is integrated in battery protection plate, the power line of the positive power terminal of the battery cell is separated with the power line of the negative power terminal of the battery cell, and only through preset line between first connector and second connector, compared with the connection between the two connectors of traditional power line, the preset line of the utility model can be passed through small current, and the length of the connecting line between first connector and second connector is reduced, and then, the internal resistance of battery protection plate is greatly reduced, and the problem of temperature rise is solved.And, battery only includes positive circuit board and negative circuit board, and preset line is arranged on the mainboard of terminal device, and then, the positive circuit board and the negative circuit board of battery are not connected, only when the positive circuit board is buckled in the first buckling area and the negative circuit board is buckled in the second buckling area, the positive power terminal B+ and the negative power terminal B- are connected, the situation of short-circuit explosion and fire is prevented, and the power consumption of battery itself is reduced when the battery is transported or the battery is not connected with the terminal device.

[0085] Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery protection circuit, characterized by, The battery protection circuit comprises a positive main line circuit and a negative main line circuit; The positive main line circuit comprises a first connector, which is used for connecting with the positive power end of the battery cell through a power line; The negative main line circuit comprises a second connector, which is used for connecting with the negative power end of the battery cell through a power line; The first connector and the second connector are connected through a preset line, wherein the current carrying capacity of the preset line is less than that of the power line.

2. The circuit of claim 1, wherein, The ports of the first connector are all first positive ports, which are connected with the positive power end of the battery cell through a power line, and the first positive ports are connected with the second connector based on the preset line.

3. The circuit of claim 2, wherein, The negative main line circuit comprises a battery protection device; The ports of the second connector comprise a second positive port and a second negative port, the second negative port is connected with the negative power end of the battery cell through a power line and the battery protection device, the second positive port is connected with the first positive port through the preset line, and the second positive port is connected with the battery protection device.

4. The circuit of claim 3, wherein, The battery protection device comprises a switch tube and a test resistor; The second negative port is connected with the negative power end of the battery cell through the switch tube and the test resistor.

5. The circuit of claim 1, wherein, The ports of the second connector are all third negative ports, which are connected with the negative power end of the battery cell based on a power line, and the third negative ports are connected with the first connector based on the preset line.

6. The circuit of claim 5, wherein, The positive main line circuit comprises a battery protection device; The ports of the first connector comprise a fourth positive port and a fourth negative port, the fourth positive port is connected with the positive power end of the battery cell through a power line and the battery protection device, the fourth positive port is connected with the third negative port through the preset line, and the fourth negative port is connected with the battery protection device.

7. The circuit of claim 6, wherein, The battery protection device comprises a switch tube and a test resistor; The fourth positive port is connected with the positive power end of the battery cell through the switch tube and the test resistor.

8. The circuit of claim 1, wherein, The circuit further comprises a current limiting resistor; The current limiting resistor is arranged in the positive main line circuit, a first end of the current limiting resistor is connected with the second connector through the preset line, and a second end of the current limiting resistor is connected with the first connector; or The current limiting resistor is arranged in the negative main line circuit, a first end of the current limiting resistor is connected with the first connector through the preset line, and a second end of the current limiting resistor is connected with the second connector.

9. A battery protection plate, characterized in that The battery protection board comprises the battery protection circuit according to any one of claims 1 to 7, and the battery protection board comprises a positive circuit board and a negative circuit board; The positive main line circuit is integrated on the positive circuit board, and the negative main line circuit is integrated on the negative circuit board.

10. The battery protection plate of claim 9, wherein, The battery protection circuit is adapted to be connected with a main board of a terminal device, and the main board comprises a first buckling area and a second buckling area; The positive circuit board is buckled and connected with the first buckling area, and the negative circuit board is buckled and connected with the second buckling area.

11. The battery protection plate of claim 9, wherein, The preset line is arranged on the main board of the terminal device.

12. A battery, characterized by The battery comprises a battery protection plate as claimed in any one of claims 9 to 10.

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