Large-current battery and over-current protection method of large-current battery

Abstract

The invention relates to a high-current battery and an overcurrent protection method of the high-current battery, and the high-current battery comprises a battery pack which is used for outputting current; the first end of the detection circuit is connected with the battery pack, and the detection circuit is used for detecting the output current of the battery pack; the first end of the control circuit is connected with the third end of the detection circuit, and the control circuit is used for outputting a turn-off signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold value; the first end of the protection circuit is connected with the second end of the detection circuit, the second end of the protection circuit is connected with the second end of the control circuit, the third end of the protection circuit is connected with the third end of the control circuit, the fourth end of the protection circuit is connected with a negative port, and the protection circuit is used for turning off current between the battery pack and the negative port after receiving the turn-off signal. According to the large battery current, protection can be carried out during overcurrent, and the safety performance of the large battery current is improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a high-current battery and an overcurrent protection method for the high-current battery. Background Art

[0002] With the development of electrical devices, the demand for high-current batteries is increasing. High-current batteries can provide high current, but high current can also easily damage the battery itself, leading to safety issues such as spontaneous combustion.

[0003] Currently, there are two commonly used overcurrent protection methods for high-current batteries. One is to configure a discharge protection circuit on the battery management system circuit board, which can protect against damage from high current to a certain extent. However, this method does not protect the high-current battery itself, and the discharge protection is more likely to cause the battery to spontaneously combust.

[0004] Another approach is to use MOS tubes to improve the ability to pass high currents. However, this second approach also has drawbacks. In high-current scenarios, multiple MOS tubes may need to be connected in parallel to ensure that the battery management system's overcurrent capability exceeds the maximum current of the high-current battery. However, connecting multiple MOS tubes in parallel increases the overall size of the protection circuit, which is primarily composed of MOS tubes. In this application scenario, the pin connection lengths of the MOS tube and the driver circuit are different, resulting in different switching speeds for the driver circuit to drive the MOS tube. This makes it impossible to balance the current when high current passes through, causing damage to the MOS tube.

[0005] It can be seen that the overcurrent protection scheme for high-current batteries in the prior art is still imperfect. Summary of the Invention

[0006] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides a high-current battery and an overcurrent protection method for a high-current battery.

[0007] In a first aspect, a high-current battery is provided, comprising: A battery pack for outputting current; a detection circuit, a first end of which is connected to the battery pack and is used to detect the output current of the battery pack; a control circuit, a first terminal of which is connected to the third terminal of the detection circuit, and configured to output a shutdown signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold; A protection circuit, wherein the first end is connected to the second end of the detection circuit, the second end is connected to the second end of the control circuit, the third end is connected to the third end of the control circuit, and the fourth end is connected to the negative port, and is used to shut down the current between the battery pack and the negative port after receiving the shutdown signal.

[0008] Optionally, the control circuit is further configured to output a start signal when the detection circuit detects that the output current of the battery pack is less than a preset threshold; The protection circuit is further configured to, after receiving the start-up signal, allow the output current of the battery pack to enter the protection circuit from the first end of the protection circuit and then be output from the fourth end of the protection circuit to the negative electrode port.

[0009] Optionally, the protection circuit includes: 2N shunt units, of which , and is an integer, Among them, the 2N shunt units are used to shunt the output current of the battery pack after receiving the start signal, when the output current of the battery pack enters from the first end of the protection circuit, and output it from the fourth end of the protection circuit to the negative port.

[0010] Optionally, the 2N shunt units in the protection circuit are stacked.

[0011] Optionally, the protection circuit includes: at least one first type of diverter unit and at least one second type of diverter unit, Wherein, the first end of the first type shunt unit is connected to the second end of the protection circuit through the corresponding first shunt resistor, the second end is connected to the middle end, and the third end is connected to the first end of the protection circuit; The first end of the second type shunt unit is connected to the third end of the protection circuit through the corresponding second shunt resistor, the second end is connected to the middle end, and the third end is connected to the fourth end of the protection circuit; The number of the first type of diversion units and the second type of diversion units is equal.

[0012] Optionally, the protection circuit includes: At least one discharge MOS tube and at least one charge MOS tube, The gate of the discharge MOS tube is connected to the second end of the protection circuit through the corresponding first shunt resistor, the drain is connected to the middle end, and the source is connected to the first end of the protection circuit; The gate of the charging MOS tube is connected to the third terminal of the protection circuit through the corresponding second shunt resistor, the drain is connected to the middle terminal, and the source is connected to the fourth terminal of the protection circuit; The number of the discharging MOS tubes is equal to the number of the charging MOS tubes.

[0013] Optionally, the protection circuit further includes: Conductive metal carrier plate for conducting electricity and dissipating heat; The conductive metal carrier includes a first area, a second area and a third area, the first surface of the first area is connected to the first end of the first type of shunt unit, the first surface of the second area is connected to the third end of the second type of shunt unit, and the first surface of the third area is connected to the middle end.

[0014] Optionally, the protection circuit further includes: a ceramic substrate connected to the second surface of the first region, the second surface of the second region, and the third surface of the third region, for heat insulation and electrical insulation; The second surface of the first region is opposite to the first surface of the first region, the second surface of the second region is opposite to the first surface of the second region, and the second surface of the third region is opposite to the first surface of the third region.

[0015] In a second aspect, a method for overcurrent protection of a high-current battery is provided. The method is applied to a high-current battery, wherein the high-current battery includes a battery pack, and the method includes: The detection circuit detects the output current of the battery pack; The control circuit outputs a shutdown signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold; After receiving the shutdown signal, the protection circuit shuts off the current between the battery pack and the negative electrode port.

[0016] Optionally, the method further includes: The control circuit outputs a start signal when the detection circuit detects that the output current of the battery pack is less than a preset threshold; After receiving the start-up signal, the protection circuit allows the output current of the battery pack to enter the protection circuit from the first end of the protection circuit and then be output to the negative electrode port from the fourth end of the protection circuit.

[0017] The present invention provides an overcurrent protection method for a high-current battery and a high-current battery circuit. The high-current battery includes: a battery pack for outputting current; a detection circuit having a first end connected to the battery pack for detecting the output current of the battery pack; a control circuit having a first end connected to a third end of the detection circuit for outputting a shutdown signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold; and a protection circuit having a first end connected to a second end of the detection circuit, a second end connected to a second end of the control circuit, a third end connected to a third end of the control circuit, and a fourth end connected to a negative terminal for shutting off the current between the battery pack and the negative terminal upon receiving the shutdown signal. In an embodiment of the present invention, when the output current of the battery pack is greater than or equal to the preset threshold, the protection circuit shuts off, and the battery pack no longer outputs current. That is, when an overcurrent may occur in the high-current battery, the overcurrent protection device can cut off the current, thereby protecting the high-current battery and improving the safety performance of the high-current battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 Shown is a schematic diagram of a high-current battery according to an embodiment of the present invention; Figure 2 FIG2 is a schematic diagram of a protection circuit according to an embodiment of the present invention; Figure 3 FIG2 is a schematic diagram of a protection circuit according to an embodiment of the present invention; Figure 4 FIG2 is a schematic diagram of a protection circuit according to an embodiment of the present invention; Figure 5 FIG2 is a flow chart of an overcurrent protection method for a high-current battery according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] Figure 1 FIG2 is a schematic diagram of a high current battery according to an embodiment of the present invention, referring to FIG2. Figure 1 As shown, an embodiment of the present invention provides a high-current battery.

[0023] The high current battery comprises: A battery pack 100 for outputting current; A detection circuit 110, a first end of which is connected to the battery pack 100 and is used to detect the output current of the battery pack 100; a control circuit 120 having a first terminal connected to the third terminal of the detection circuit 110 and configured to output a shutdown signal when the detection circuit 110 detects that the output current of the battery pack 100 is greater than or equal to a preset threshold; The protection circuit 130 has a first end connected to the second end of the detection circuit 110, a second end connected to the second end of the control circuit 120, a third end connected to the third end of the control circuit 120, and a fourth end connected to the negative port 140, and is used to shut down the current between the battery pack 100 and the negative port 140 after receiving the shutdown signal.

[0024] In the embodiment of the present invention, the detection circuit 120 , the control circuit 130 and the protection circuit 140 may also be referred to as an overcurrent protection device.

[0025] In an embodiment of the present invention, when the output current of the battery pack 100 is greater than or equal to a preset threshold, the protection circuit 130 is shut down, and the battery pack 100 no longer outputs current to the outside. That is, when an overcurrent may occur in a large-current battery, the overcurrent protection device can cut off the current, thereby protecting the large battery current and improving the safety performance of the large battery current.

[0026] In the embodiment of the present invention, the control circuit 120 is further configured to output a start signal when the detection circuit 110 detects that the output current of the battery pack 100 is less than a preset threshold; The protection circuit 130 is further configured to, after receiving the start signal, allow the output current of the battery pack 100 to enter the protection circuit 130 from the first terminal of the protection circuit 130 and then be output from the fourth terminal of the protection circuit 130 to the negative electrode port 140 .

[0027] In the embodiment of the present invention, when the output current of the battery pack 100 is less than a preset threshold, the output current is output through the protection circuit 130 to supply power to the outside.

[0028] Figure 1 The positive terminal 150 is a high current battery positive terminal.

[0029] In an embodiment of the present invention, the protection circuit includes: 2N shunt units, of which , and is an integer, The 2N shunt units are used to shunt the output current of the battery pack after receiving the start signal and output it from the fourth end of the protection circuit to the negative port 140 when the output current of the battery pack enters from the first end of the protection circuit.

[0030] In the embodiment of the present invention, the negative electrode port is the negative electrode port 140 of the high current battery for external power supply. The high current battery also includes a positive electrode port 150 for external power supply, Figure 1 As shown, the positive terminal 150 is connected to the positive terminal of the battery pack.

[0031] In an embodiment of the present invention, the 2N shunt units in the protection circuit are stacked.

[0032] In an embodiment of the present invention, 2N shunt units are stacked to reduce the size of the protection circuit, shorten the signal transmission path, reduce the delay between the shutdown signals received by different shunt units and / or the delay between the start signals, avoid the inconsistency of turning on and / or off caused by the delay in the start time and / or shutdown time of the shunt unit, reduce the reduction in current shunt capacity caused by inconsistency, increase the current carrying capacity of the protection circuit, avoid the burning of the protection current, and facilitate the large current battery to output a larger current.

[0033] In an embodiment of the present invention, the protection circuit includes: at least one first type of diverter unit and at least one second type of diverter unit, Wherein, the first end of the first type shunt unit is connected to the second end of the protection circuit through the corresponding first shunt resistor, the second end is connected to the middle end, and the third end is connected to the first end of the protection circuit; The first end of the second type shunt unit is connected to the third end of the protection circuit through the corresponding second shunt resistor, the second end is connected to the middle end, and the third end is connected to the fourth end of the protection circuit; The number of the first type of diversion units and the second type of diversion units is equal.

[0034] In an embodiment of the present invention, the protection circuit includes 2N shunt units, wherein N shunt units are first-type shunt units and N shunt units are second-type shunt units.

[0035] In an embodiment of the present invention, the protection circuit includes: At least one discharge MOS tube and at least one charge MOS tube, The gate of the discharge MOS tube is connected to the second end of the protection circuit through the corresponding first shunt resistor, the drain is connected to the middle end, and the source is connected to the first end of the protection circuit; The gate of the charging MOS tube is connected to the third terminal of the protection circuit through the corresponding second shunt resistor, the drain is connected to the middle terminal, and the source is connected to the fourth terminal of the protection circuit; The number of the discharging MOS tubes is equal to the number of the charging MOS tubes.

[0036] Figure 2 FIG. 1 is a schematic diagram of a protection circuit according to an embodiment of the present invention. Figure 2 As shown, 210 is a discharge MOS tube, and 220 is a charge MOS tube. Figure 2 Two discharge MOS tubes and two charge MOS tubes are shown in FIG. Figure 2 The first shunt resistor and the second shunt resistor are not shown.

[0037] Figure 3 FIG. 1 is a circuit diagram of a protection circuit according to an embodiment of the present invention. Figure 3 As shown, the discharge MOS tube is a MOS tube wafer / chip, and the charging MOS tube is also a MOS tube wafer / chip.

[0038] In the MOS tube wafer, the first pin is the gate ( Figure 3 The G pole in the source is connected to the control circuit; the source has multiple pins ( Figure 3 The source of the charging MOS tube is connected to the detection circuit, and the source of the discharging MOS tube is connected to the negative terminal; the drain also has multiple pins ( Figure 3 The D terminal is connected to the middle terminal. Figure 3 In the embodiment shown, each MOS transistor wafer may have multiple S-pole pins and multiple D-pole pins during connection. During connection, multiple S-pole pins and multiple D-pole pins need to be connected in parallel.

[0039] Figure 3 The first shunt resistor is R27, R31, etc., and the second shunt resistor is R25, R32, etc., refer to Figure 3 As shown, no further details are given here.

[0040] In an embodiment of the present invention, the protection circuit further includes: Conductive metal carrier plate for conducting electricity and dissipating heat; The conductive metal carrier includes a first area, a second area and a third area, the first surface of the first area is connected to the first end of the first type of shunt unit, the first surface of the second area is connected to the third end of the second type of shunt unit, and the first surface of the third area is connected to the middle end.

[0041] In an embodiment of the present invention, the protection circuit further includes: a ceramic substrate connected to the second surface of the first region, the second surface of the second region, and the third surface of the third region, for heat insulation and electrical insulation; The second surface of the first region is opposite to the first surface of the first region, the second surface of the second region is opposite to the first surface of the second region, and the second surface of the third region is opposite to the first surface of the third region.

[0042] In an embodiment of the present invention, the conductive metal carrier is a copper carrier; in other embodiments of the present invention, the conductive metal carrier may also be a silver carrier, or a silver-plated carrier.

[0043] In this embodiment of the present invention, a conductive metal carrier is used to directly connect the conductive metal carrier to the pins of the shunt unit, effectively replacing traditional wires with the metal carrier. This direct connection of the conductive metal carrier to the conductive metal pins, replacing traditional wire connections, shortens the signal transmission path, improves the current-carrying capacity of the protection circuit, and facilitates higher current output from high-current batteries.

[0044] Figure 4 FIG. 1 is a schematic diagram of a protection circuit according to an embodiment of the present invention. Figure 4 As shown, the first area 410 of the conductive metal carrier is the first end of the protection circuit, which is connected to the battery pack; the second area 440 of the conductive metal carrier is the fourth end of the protection circuit, which is connected to the negative terminal and serves as the negative electrode of the high-current battery; the third area of ​​the conductive metal carrier is not shown.

[0045] refer to Figure 4 As shown, the protection circuit of the embodiment of the present invention further includes a second terminal 420 and a third terminal 430, which are respectively connected to the control circuit and are used to receive a shutdown signal and a start signal.

[0046] The protection circuit of the embodiment of the present invention further includes a fifth terminal 450 and a sixth terminal 460 . These two ports are reserved ports and can be used for testing, detection, etc.

[0047] In embodiments of the present invention, the die bonding process, also known as the chip bonding process, can be employed in chip packaging processes. This process offers extremely high precision, typically achieving 10µm accuracy. In embodiments of the present invention, the die bonding process is used to directly package multiple MOS wafers onto a conductive metal carrier, directly connecting the conductive metal carrier to the pins of the shunt unit. This effectively replaces traditional wires with the metal carrier. Direct metal-to-metal bonding, replacing traditional wire connections, enables micron- or even nanometer-level connection pitches, enabling ultra-fine pitch stacking and packaging within a very small space. This eliminates the need for long metal wires, shortens signal transmission paths, and eliminates traditional processes such as plastic encapsulation of MOS transistors, significantly reducing the size of the final product. Furthermore, the high-precision bonding process reduces the length of the MOS control pins, allowing for internal connections and separate pins for the charge and discharge MOS terminals. To facilitate heat dissipation, the copper carrier can be thickened to 0.3mm, further facilitating heat dissipation. Furthermore, to address heat transfer issues, a ceramic substrate is added to the other side of the conductive metal carrier to provide insulation, reducing heat transfer to other PCBs and also providing insulation.

[0048] An embodiment of the present invention also provides an overcurrent protection method for a high-current battery.

[0049] Figure 5 FIG2 is a flow chart of an overcurrent protection method for a large current battery according to an embodiment of the present invention, referring to FIG2. Figure 5 As shown, the method is applied to a large current battery, the large current battery including a battery pack, and the method includes: Step 510: The detection circuit detects the output current of the battery pack; Step 520: When the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold, the control circuit outputs a shutdown signal; Step 530: After receiving the shutdown signal, the protection circuit shuts off the current between the battery pack and the negative terminal.

[0050] In an embodiment of the present invention, the method further includes: The control circuit outputs a start signal when the detection circuit detects that the output current of the battery pack is less than a preset threshold; After receiving the start-up signal, the protection circuit allows the output current of the battery pack to enter the protection circuit from the first end of the protection circuit and then be output to the negative electrode port from the fourth end of the protection circuit.

[0051] In an embodiment of the present invention, the protection circuit includes: 2N shunt units, of which , and is an integer, Among them, the 2N shunt units are used to shunt the output current of the battery pack after receiving the start signal, when the output current of the battery pack enters from the first end of the protection circuit, and output it from the fourth end of the protection circuit to the negative port.

[0052] In an embodiment of the present invention, the 2N shunt units in the protection circuit are stacked.

[0053] In an embodiment of the present invention, the protection circuit includes: at least one first type of diverter unit and at least one second type of diverter unit, Wherein, the first end of the first type shunt unit is connected to the second end of the protection circuit through the corresponding first shunt resistor, the second end is connected to the middle end, and the third end is connected to the first end of the protection circuit; The first end of the second type shunt unit is connected to the third end of the protection circuit through the corresponding second shunt resistor, the second end is connected to the middle end, and the third end is connected to the fourth end of the protection circuit; The number of the first type of diversion units and the second type of diversion units is equal.

[0054] In an embodiment of the present invention, the protection circuit includes: At least one discharge MOS tube and at least one charge MOS tube, The gate of the discharge MOS tube is connected to the second end of the protection circuit through the corresponding first shunt resistor, the drain is connected to the middle end, and the source is connected to the first end of the protection circuit; The gate of the charging MOS tube is connected to the third terminal of the protection circuit through the corresponding second shunt resistor, the drain is connected to the middle terminal, and the source is connected to the fourth terminal of the protection circuit; The number of the discharging MOS tubes is equal to the number of the charging MOS tubes.

[0055] In an embodiment of the present invention, the protection circuit further includes: Conductive metal carrier plate for conducting electricity and dissipating heat; The conductive metal carrier includes a first area, a second area and a third area, the first surface of the first area is connected to the first end of the first type of shunt unit, the first surface of the second area is connected to the third end of the second type of shunt unit, and the first surface of the third area is connected to the middle end.

[0056] In an embodiment of the present invention, the protection circuit further includes: a ceramic substrate connected to the second surface of the first region, the second surface of the second region, and the third surface of the third region, for heat insulation and electrical insulation; The second surface of the first region is opposite to the first surface of the first region, the second surface of the second region is opposite to the first surface of the second region, and the second surface of the third region is opposite to the first surface of the third region.

[0057] The method of the present invention can provide protection during overcurrent and improve the safety performance of large battery currents.

[0058] Figure 5 FIG. 1 is a flow chart of an overcurrent protection method for a large current battery in one embodiment. It should be understood that although Figure 5 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 5 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0060] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high current battery, characterized in that: The high current battery comprises: A battery pack for outputting current; a detection circuit, a first end of which is connected to the battery pack and is used to detect the output current of the battery pack; a control circuit, a first terminal of which is connected to the third terminal of the detection circuit, and configured to output a shutdown signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold; A protection circuit, wherein the first end is connected to the second end of the detection circuit, the second end is connected to the second end of the control circuit, the third end is connected to the third end of the control circuit, and the fourth end is connected to the negative port, and is used to shut down the current between the battery pack and the negative port after receiving the shutdown signal.

2. The high current battery according to claim 1, characterized in that: The control circuit is further configured to output a start signal when the detection circuit detects that the output current of the battery pack is less than a preset threshold; The protection circuit is further configured to, after receiving the start-up signal, allow the output current of the battery pack to enter the protection circuit from the first end of the protection circuit and then be output from the fourth end of the protection circuit to the negative electrode port.

3. The high current battery according to claim 2, characterized in that: The protection circuit comprises: 2N shunt units, of which , and is an integer, Among them, the 2N shunt units are used to shunt the output current of the battery pack after receiving the start signal, when the output current of the battery pack enters from the first end of the protection circuit, and output it from the fourth end of the protection circuit to the negative port.

4. The high-current battery according to claim 3, characterized in that: The 2N shunt units in the protection circuit are stacked.

5. The high current battery according to claim 2, characterized in that: The protection circuit comprises: at least one first type of diverter unit and at least one second type of diverter unit, Wherein, the first end of the first type shunt unit is connected to the second end of the protection circuit through the corresponding first shunt resistor, the second end is connected to the middle end, and the third end is connected to the first end of the protection circuit; The first end of the second type shunt unit is connected to the third end of the protection circuit through the corresponding second shunt resistor, the second end is connected to the middle end, and the third end is connected to the fourth end of the protection circuit; The number of the first type of diversion units and the second type of diversion units is equal.

6. The high-current battery according to claim 2, characterized in that: The protection circuit comprises: At least one discharge MOS tube and at least one charge MOS tube, The gate of the discharge MOS tube is connected to the second end of the protection circuit through the corresponding first shunt resistor, the drain is connected to the middle end, and the source is connected to the first end of the protection circuit; The gate of the charging MOS tube is connected to the third terminal of the protection circuit through the corresponding second shunt resistor, the drain is connected to the middle terminal, and the source is connected to the fourth terminal of the protection circuit; The number of the discharging MOS tubes is equal to the number of the charging MOS tubes.

7. The high-current battery according to claim 5, characterized in that: The protection circuit further includes: Conductive metal carrier plate for conducting electricity and dissipating heat; The conductive metal carrier includes a first area, a second area and a third area, the first surface of the first area is connected to the first end of the first type of shunt unit, the first surface of the second area is connected to the third end of the second type of shunt unit, and the first surface of the third area is connected to the middle end.

8. The high-current battery according to claim 7, characterized in that: The protection circuit further includes: a ceramic substrate connected to the second surface of the first region, the second surface of the second region, and the third surface of the third region, for heat insulation and electrical insulation; The second surface of the first region is opposite to the first surface of the first region, the second surface of the second region is opposite to the first surface of the second region, and the second surface of the third region is opposite to the first surface of the third region.

9. A method for overcurrent protection of a high current battery, characterized in that: The method is applied to a high-current battery, wherein the high-current battery includes a battery pack, and the method includes: The detection circuit detects the output current of the battery pack; The control circuit outputs a shutdown signal when the detection circuit detects that the output current of the battery pack is greater than or equal to a preset threshold; After receiving the shutdown signal, the protection circuit shuts off the current between the battery pack and the negative terminal.

10. The method according to claim 9, characterized in that The method further comprises: The control circuit outputs a start signal when the detection circuit detects that the output current of the battery pack is less than a preset threshold; After receiving the start-up signal, the protection circuit allows the output current of the battery pack to enter the protection circuit from the first end of the protection circuit and then be output to the negative electrode port from the fourth end of the protection circuit.

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