Quick turn-off protection circuit of discharge MOS tube, battery protection board and electric vehicle

Abstract

The utility model relates to the technical field of battery overcurrent protection, and discloses a rapid turn-off protection circuit of a discharge MOS tube, a battery protection board and an electric vehicle. The rapid turn-off protection circuit comprises a first switch tube Q1 and a second switch tube Q2. The positive input end of the first switch tube Q1 is electrically connected with the positive electrode of the battery, and the positive input end of the second switch tube Q2 is electrically connected with the control end of the discharge MOS tube. According to the rapid turn-off protection circuit of the MOS tube for controlling the positive end to discharge, once abnormal discharge phenomena such as short circuit and overcurrent occur outside the battery, the voltage of the positive terminal of battery discharge can be rapidly lowered, the first switch tube Q1 and the second switch tube Q2 are conducted in sequence, the level of the control end of the discharge MOS tube is rapidly lowered, and the voltage of the positive terminal of the battery discharge can be rapidly lowered. Therefore, the problem that in the prior art, when the electric vehicle discharge MOS tube is short-circuited and overcurrent occurs, the initial-stage large current cannot be protected in time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery overcurrent protection, in particular to a fast shutdown protection circuit of a discharge MOS tube, a battery protection board and an electric vehicle. Background Art

[0002] Batteries are an important component of electric vehicles, and BMS (Battery Management System) is a key component for managing battery charging / discharging and protecting batteries from damage. Among them, the discharge MOS tube is a key protection device of BMS. In the design of BMS, when overcurrent or short circuit occurs in the battery or the entire vehicle, the discharge MOS tube must be turned off in time to protect the battery.

[0003] Compared to the BMS control negative terminal solution, the BMS control positive terminal solution for high-string, high-capacity batteries is relatively safer because most of them are connected to the common ground. Currently, in BMS design, the BMS control positive terminal solution for high-string, high-capacity batteries has an overcurrent protection function in the event of a short circuit or overcurrent. However, by the time the BMS detects the overcurrent and sends a switch signal to control the shutdown of the discharge MOS tube, the discharge MOS tube is often burned or damaged. Therefore, there is a risk that the existing BMS will not be able to shut down the discharge MOS tube in time, thereby damaging the battery components.

[0004] In view of this, for the BMS control positive terminal solution of high-string and large-capacity batteries, this field urgently needs to design a method to solve the problem in the existing technology that when the electric vehicle discharge MOS tube is short-circuited or overcurrent occurs, the initial large current cannot be protected in time.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0006] The purpose of the utility model is to provide a fast shutdown protection circuit for a discharge MOS tube, so as to solve or at least partially solve the technical problems existing in the prior art.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a fast shutdown protection circuit for a discharge MOS tube, comprising: a first switch tube Q1 and a second switch tube Q2; the positive input terminal of the first switch tube Q1 is electrically connected to the positive electrode of the battery, and the positive input terminal of the second switch tube Q2 is electrically connected to the control terminal of the discharge MOS tube;

[0009] The positive input terminal of the first switch tube Q1 is also electrically connected to the control terminal of the first switch tube Q1 through the resistor R1; the control terminal of the first switch tube Q1 is also electrically connected to the positive discharge terminal of the battery through the RC filter circuit;

[0010] The negative input terminal of the first switching transistor Q1 is electrically connected to a voltage divider circuit; the voltage divider circuit includes a resistor R4 and a resistor R5 connected in series, wherein one end of the resistor R4 is electrically connected to the negative input terminal of the first switching transistor Q1, and the other end of the resistor R4 is electrically connected to the control terminal of the second switching transistor Q2; the negative input terminal of the second switching transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, respectively, and the other end of the resistor R5 is electrically connected to the other end of the voltage divider resistor R4;

[0011] When the voltage difference between the voltage of the positive electrode of the battery and the voltage of the positive discharge terminal of the battery is greater than or equal to the preset shutdown threshold, the positive input terminal and the negative input terminal of the first switch tube Q1 are turned on, and then the positive input terminal and the negative input terminal of the second switch tube Q2 are turned on, the voltage of the control terminal of the discharge MOS tube is pulled down, and the discharge MOS tube is turned off.

[0012] Optionally, the first switch tube Q1 is a PNP transistor, and the second switch tube Q2 is an NPN transistor;

[0013] The emitter of the PNP transistor Q1 is electrically connected to the positive terminal of the battery, and the collector of the NPN transistor Q2 is electrically connected to the control terminal of the discharge MOS tube;

[0014] The emitter of the PNP transistor Q1 is also electrically connected to one end of the resistor R1, the other end of the resistor R1 is electrically connected to the base of the PNP transistor Q1; the base of the PNP transistor Q1 is also electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery;

[0015] The collector of the PNP transistor Q1 is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the base of the NPN transistor Q2; the emitter of the NPN transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, and the other end of the resistor R5 is electrically connected to the other end of the resistor R4.

[0016] Optionally, a resistor R2 is further electrically connected between the collector of the NPN transistor Q2 and the control end of the discharge MOS transistor.

[0017] Optionally, the first switch tube Q1 is an enhancement-mode PMOS tube, and the second switch tube Q2 is an enhancement-mode NMOS tube;

[0018] The source of the enhancement-mode PMOS transistor Q1 is electrically connected to the positive electrode of the battery, and the drain of the enhancement-mode NMOS transistor Q2 is electrically connected to the control terminal of the discharge MOS transistor;

[0019] The drain of the enhancement mode PMOS transistor Q1 is also electrically connected to one end of the resistor R1, the other end of which is electrically connected to the base of the PNP transistor Q1; the gate of the enhancement mode PMOS transistor Q1 is also electrically connected to one end of the resistor R3, the other end of which is electrically connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery.

[0020] The drain of the enhancement-mode PMOS transistor Q1 is electrically connected to one end of a resistor R4, the other end of which is electrically connected to the base of the NPN transistor Q2. The source of the enhancement-mode NMOS transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of a resistor R5, respectively, the other end of which is electrically connected to the other end of the resistor R4.

[0021] Optionally, a resistor R2 is further electrically connected between the drain of the strong-mode NMOS transistor Q2 and the control end of the discharge MOS transistor.

[0022] Optionally, the discharge MOS tube is an NMOS enhancement type field effect tube, and the control end of the discharge MOS tube is the gate of the NMOS enhancement type field effect tube.

[0023] In a second aspect, the present invention further provides a battery protection board on which a fast shutdown protection circuit of a discharge MOS tube is integrated. The fast shutdown protection circuit adopts the fast shutdown protection circuit of a discharge MOS tube as described above.

[0024] In a third aspect, the present invention also provides an electric vehicle, comprising a battery, a BMS for managing battery charge / discharge, and a battery protection board for quickly shutting down a discharge MOS tube, wherein the battery protection board adopts a battery protection board as described above.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The fast shutdown protection circuit of the discharge MOS tube provided by the utility model can quickly reduce the voltage of the battery discharge positive terminal once an abnormal discharge phenomenon such as a short circuit or overcurrent occurs outside the battery, turning on the first switch tube Q1 and the second switch tube Q2 in succession, so that the voltage of the control terminal of the discharge MOS tube is quickly reduced, thereby quickly shutting down the discharge MOS tube. This solves the problem in the prior art that the discharge MOS tube of an electric vehicle cannot be protected in time when a short circuit or overcurrent occurs.

[0027] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a structural principle diagram of a fast shutdown protection circuit for a discharge MOS tube provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0031] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0032] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0033] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0034] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0035] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0036] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0037] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0038] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In light of the shortcomings of prior art rapid-shutdown protection circuits for discharge MOS transistors, the applicant, drawing on years of extensive practical experience and expertise in the design and manufacture of such products, combined with applied theory, has actively engaged in research and innovation, hoping to develop a technology that addresses these shortcomings and make rapid-shutdown protection circuits for discharge MOS transistors more practical. Through continuous research and design, repeated prototype production, and improvements, the applicant has finally developed the present utility model, which possesses proven practical value.

[0040] Example 1:

[0041] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a fast shutdown protection circuit for a discharge MOS tube provided by an embodiment of the present utility model. The fast shutdown protection circuit includes:

[0042] A first switching tube Q1 and a second switching tube Q2; the positive input end of the first switching tube Q1 is electrically connected to the positive electrode of the battery, and the positive input end of the second switching tube Q2 is electrically connected to the control end of the discharge MOS tube;

[0043] The positive input terminal of the first switch tube Q1 is also electrically connected to the control terminal of the first switch tube Q1 through the resistor R1; the control terminal of the first switch tube Q1 is also electrically connected to the positive discharge terminal of the battery through the RC filter circuit;

[0044] The negative input terminal of the first switching transistor Q1 is electrically connected to a voltage divider circuit; the voltage divider circuit includes a resistor R4 and a resistor R5 connected in series, wherein one end of the resistor R4 is electrically connected to the negative input terminal of the first switching transistor Q1, and the other end of the resistor R4 is electrically connected to the control terminal of the second switching transistor Q2; the negative input terminal of the second switching transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, respectively, and the other end of the resistor R5 is electrically connected to the other end of the voltage divider resistor R4;

[0045] When the voltage difference between the voltage of the positive electrode of the battery and the voltage of the positive discharge terminal of the battery is greater than or equal to the preset shutdown threshold, the positive input terminal and the negative input terminal of the first switch tube Q1 are turned on, and then the positive input terminal and the negative input terminal of the second switch tube Q2 are turned on, the voltage of the control terminal of the discharge MOS tube is pulled down, and the discharge MOS tube is turned off.

[0046] The fast shutdown protection circuit for the discharge MOS transistor provided in this embodiment rapidly reduces the voltage at the positive discharge terminal of the battery once an abnormal discharge phenomenon such as a short circuit or overcurrent occurs outside the battery. This sequentially turns on the first switch Q1 and the second switch Q2, rapidly reducing the voltage at the control terminal of the discharge MOS transistor and rapidly shutting down the discharge MOS transistor, thereby promptly protecting the battery's safety.

[0047] Specifically, the switch tube Q1 can be a triode or a MOS tube;

[0048] As an optional implementation, the first switch tube Q1 is a PNP transistor, and the second switch tube Q2 is an NPN transistor;

[0049] The emitter of the PNP transistor Q1 is electrically connected to the positive terminal of the battery (i.e. Figure 1 The collector of the NPN transistor Q2 is electrically connected to the control terminal of the discharge MOS tube (i.e. Figure 1 GD terminal in the );

[0050] The emitter of the PNP transistor Q1 is also electrically connected to one end of the resistor R1, the other end of the resistor R1 is electrically connected to the base of the PNP transistor Q1; the base of the PNP transistor Q1 is also electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery (i.e. Figure 1 P+ terminal in the PCB);

[0051] The collector of the PNP transistor Q1 is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the base of the NPN transistor Q2; the emitter of the NPN transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, and the other end of the resistor R5 is electrically connected to the other end of the resistor R4.

[0052] Optionally, a resistor R2 is further electrically connected between the collector of the NPN transistor Q2 and the control end of the discharge MOS transistor.

[0053] As another optional implementation, the first switch tube Q1 is an enhancement-mode PMOS tube, and the second switch tube Q2 is an enhancement-mode NMOS tube;

[0054] The source of the enhancement mode PMOS tube Q1 is electrically connected to the positive electrode of the battery (i.e. Figure 1 The drain of the enhancement type NMOS tube Q2 is electrically connected to the control terminal of the discharge MOS tube (i.e. Figure 1 GD terminal in the );

[0055] The drain of the enhancement mode PMOS transistor Q1 is also electrically connected to one end of the resistor R1, the other end of which is electrically connected to the base of the PNP transistor Q1; the gate of the enhancement mode PMOS transistor Q1 is also electrically connected to one end of the resistor R3, the other end of which is electrically connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery (i.e. Figure 1 P+ terminal in the PCB);

[0056] The drain of the enhancement-mode PMOS transistor Q1 is electrically connected to one end of a resistor R4, the other end of which is electrically connected to the base of the NPN transistor Q2. The source of the enhancement-mode NMOS transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of a resistor R5, respectively, the other end of which is electrically connected to the other end of the resistor R4.

[0057] More specifically, a resistor R2 is electrically connected between the drain of the strong-mode NMOS transistor Q2 and the control terminal of the discharge MOS transistor.

[0058] It should be noted that, in this embodiment, the discharge MOS tube is an NMOS enhancement type field effect tube, and the control end of the discharge MOS tube is the gate of the NMOS enhancement type field effect tube.

[0059] Example 2:

[0060] The present invention also provides a battery protection board, on which a fast shutdown protection circuit of a discharge MOS tube is integrated. The fast shutdown protection circuit adopts a fast shutdown protection circuit of a discharge MOS tube as described in the first embodiment.

[0061] Since the relevant circuit results and principles of the fast shutdown protection circuit of the discharge MOS tube have been explained in detail in the first embodiment, they will not be repeated in this embodiment.

[0062] It's important to note that both the BMS and the battery protection board (BPB) provide protection for the battery. Generally speaking, the BMS is the brain of the battery and is equipped with battery management software. The BPB, on the other hand, is a form of hardware circuit protection. Both are crucial for ensuring the safety of electric vehicles, charging station equipment, and personnel.

[0063] Compared with the existing technology, the battery protection board provided in this embodiment has an integrated fast shutdown protection circuit for the discharge MOS tube. Once an abnormal discharge phenomenon such as a short circuit or overcurrent occurs outside the battery, the voltage at the positive discharge terminal of the battery will be quickly lowered, causing the discharge MOS tube to be quickly turned off. Compared with the software protection of the BMS when abnormal discharge occurs, this is more timely, thus protecting the safety of battery use in a timely manner.

[0064] Example 3:

[0065] Based on the same concept, the present invention also provides an electric vehicle, including a battery, a BMS for managing battery charge / discharge, and a battery protection board for quickly shutting down a discharge MOS tube, wherein the battery protection board adopts the battery protection board described above.

[0066] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fast shutdown protection circuit for a discharge MOS tube, characterized in that: include: A first switching tube Q1 and a second switching tube Q2; the positive input end of the first switching tube Q1 is electrically connected to the positive electrode of the battery, and the positive input end of the second switching tube Q2 is electrically connected to the control end of the discharge MOS tube; The positive input terminal of the first switch tube Q1 is also electrically connected to the control terminal of the first switch tube Q1 through the resistor R1; the control terminal of the first switch tube Q1 is also electrically connected to the positive discharge terminal of the battery through the RC filter circuit; The negative input terminal of the first switching transistor Q1 is electrically connected to a voltage divider circuit; the voltage divider circuit includes a resistor R4 and a resistor R5 connected in series, wherein one end of the resistor R4 is electrically connected to the negative input terminal of the first switching transistor Q1, and the other end of the resistor R4 is electrically connected to the control terminal of the second switching transistor Q2; the negative input terminal of the second switching transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, respectively, and the other end of the resistor R5 is electrically connected to the other end of the voltage divider resistor R4; When the voltage difference between the voltage of the positive electrode of the battery and the voltage of the positive discharge terminal of the battery is greater than or equal to the preset shutdown threshold, the positive input terminal and the negative input terminal of the first switch tube Q1 are turned on, and then the positive input terminal and the negative input terminal of the second switch tube Q2 are turned on, the voltage of the control terminal of the discharge MOS tube is pulled down, and the discharge MOS tube is turned off.

2. The fast shutdown protection circuit of a discharge MOS tube according to claim 1, characterized in that: The first switch tube Q1 is a PNP transistor, and the second switch tube Q2 is an NPN transistor; The emitter of the PNP transistor Q1 is electrically connected to the positive terminal of the battery, and the collector of the NPN transistor Q2 is electrically connected to the control terminal of the discharge MOS tube; The emitter of the PNP transistor Q1 is also electrically connected to one end of the resistor R1, the other end of the resistor R1 is electrically connected to the base of the PNP transistor Q1; the base of the PNP transistor Q1 is also electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery; The collector of the PNP transistor Q1 is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the base of the NPN transistor Q2; the emitter of the NPN transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of the resistor R5, and the other end of the resistor R5 is electrically connected to the other end of the resistor R4.

3. The fast shutdown protection circuit of a discharge MOS tube according to claim 2, characterized in that: A resistor R2 is also electrically connected between the collector of the NPN transistor Q2 and the control end of the discharge MOS tube.

4. The fast shutdown protection circuit of a discharge MOS tube according to claim 1, characterized in that: The first switch tube Q1 is an enhancement mode PMOS tube, and the second switch tube Q2 is an enhancement mode NMOS tube; The source of the enhancement-mode PMOS transistor Q1 is electrically connected to the positive electrode of the battery, and the drain of the enhancement-mode NMOS transistor Q2 is electrically connected to the control terminal of the discharge MOS transistor; The drain of the enhancement-mode PMOS transistor Q1 is also electrically connected to one end of a resistor R1, the other end of which is electrically connected to the base of the PNP transistor Q1; the gate of the enhancement-mode PMOS transistor Q1 is also electrically connected to one end of a resistor R3, the other end of which is electrically connected to the positive electrode of a capacitor C1, and the negative electrode of the capacitor C1 is electrically connected to the positive discharge terminal of the battery; The drain of the enhancement-mode PMOS transistor Q1 is electrically connected to one end of a resistor R4, the other end of which is electrically connected to the base of the NPN transistor Q2. The source of the enhancement-mode NMOS transistor Q2 is electrically connected to the positive discharge terminal of the battery and one end of a resistor R5, respectively, the other end of which is electrically connected to the other end of the resistor R4.

5. The fast shutdown protection circuit of a discharge MOS tube according to claim 4, characterized in that: A resistor R2 is also electrically connected between the drain of the enhancement mode NMOS transistor Q2 and the control terminal of the discharge MOS transistor.

6. A fast shutdown protection circuit for a discharge MOS tube according to any one of claims 1 to 5, characterized in that: The discharge MOS tube is an NMOS enhancement type field effect tube, and the control end of the discharge MOS tube is the gate of the NMOS enhancement type field effect tube.

7. A battery protection board with a fast shutdown protection circuit of a discharge MOS tube integrated thereon, characterized in that: The fast shutdown protection circuit adopts a fast shutdown protection circuit of a discharge MOS tube as claimed in any one of claims 1 to 6.

8. An electric vehicle comprising a battery, a BMS for managing battery charge / discharge, and a battery protection board for quickly shutting down a discharge MOS tube, characterized in that: The battery protection board adopts the battery protection board as claimed in claim 7.

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