Battery pack with forced start function

Abstract

The invention discloses a battery pack with a forced start function. The battery pack with the forced start function comprises a battery box, a battery pack, a protection plate and a forced start module, the cathode of the battery pack is electrically connected to the cathode connecting terminal on the surface of the battery box, the anode of the battery pack is electrically connected to the input end of the protection plate, and the output end of the protection plate is electrically connected to the anode connecting terminal on the surface of the battery box; the forced start module comprises a bypass switch control circuit, the input end of the bypass switch control circuit is electrically connected with the positive electrode of the battery pack, and the output end of the bypass switch control circuit is electrically connected with the other end of the protection plate and a positive electrode connecting terminal on the surface of the battery box. When the battery pack enters the protection state and the protection plate carries out over-discharge protection on the battery pack, the bypass switch control circuit can be triggered to enable the battery pack to bypass the protection plate and carry out electric energy output by the bypass switch control circuit so as to serve as an emergency power supply to release residual electric quantity, so that the use flexibility of the battery pack in an emergency situation is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack with a forced start function. Background Art

[0002] The discharge management of lithium battery packs is a key technology to ensure that the battery packs can efficiently output electrical energy under safe and stable conditions. With the development of battery technology, lithium battery packs are widely used in consumer electronics, energy storage, transportation and other fields. Discharge management technology is not only related to the service life of the battery, but also affects the performance and safety of the equipment. For the discharge management of lithium batteries, the main goals include battery safety, battery life extension, output performance optimization and capacity management. Lithium batteries have high energy density, but are sensitive to temperature, over-discharge, etc. Discharge management can avoid thermal runaway and cause combustion or explosion under unreasonable use conditions. Through effective discharge management, deep discharge and over-discharge can be prevented, thereby extending the cycle life of the battery pack. At the same time, it can ensure that the battery maintains a stable voltage output under different discharge current and load conditions to meet the needs of the equipment, and by precisely controlling the discharge depth of the battery, the utilization rate of the effective capacity can be maximized.

[0003] The core of discharge management is based on the battery protection board, which is equipped with a low voltage monitoring circuit. When the voltage of a single cell drops to a specific threshold, the discharge channel is automatically cut off. At this time, the battery pack power is displayed as zero to achieve over-discharge protection. However, when encountering emergency power demand, due to the discharge management of the battery pack, the lithium battery pack with a power display of zero at this time cannot continue to discharge to provide safe emergency power under the restriction of the protection board, which limits the applicability of the lithium battery pack to emergency situations. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack with a strong start function to address the technical problem that existing lithium battery packs are insufficiently applicable to emergency power scenarios.

[0005] A battery pack with a forced start function, the battery pack with the forced start function comprises a battery box, a battery pack, a protection board and a forced start module, wherein the battery pack, the protection board and the forced start module are all installed in the battery box; wherein the negative pole of the battery pack is electrically connected to the negative pole connection terminal on the surface of the battery box, the positive pole of the battery pack is electrically connected to the input end of the protection board, and the output end of the protection board is electrically connected to the positive pole connection terminal on the surface of the battery box; one end of the forced start module is electrically connected to the positive pole of the battery pack, and the other end of the forced start module is electrically connected to the other input end of the protection board and the positive pole connection terminal on the surface of the battery box, thereby forming a bypass discharge channel relative to the protection board, and when the battery pack is fully discharged and enters an over-discharge protection state, the user can operate the forced start module to prompt the battery pack to exit the protection state and continue to release the remaining power, thereby providing emergency power to the external load while activating the protection board.

[0006] The forced start module includes a bypass switch control circuit, the input end of the bypass switch control circuit is electrically connected to the positive pole of the battery pack, and the output end of the bypass switch control circuit is electrically connected to the other end of the protection board and the positive connection terminal on the surface of the battery box. Therefore, when the battery pack enters the protection state and the protection board protects the battery pack from over-discharge, the bypass switch control circuit can be triggered to cause the battery pack to bypass the protection board and output electrical energy through the bypass switch control circuit.

[0007] In one of the embodiments, the bypass switch control circuit includes a trigger button and a P-channel MOSFET, the source of the MOSFET is electrically connected to the positive electrode of the battery pack; the drain of the MOSFET is electrically connected to the discharge end of the protection board; the gate of the MOSFET is electrically connected to the trigger button; the trigger button is arranged on the surface of the battery box and connected to the inside of the battery box, so as to manually trigger the bypass switch control circuit. When the user presses the trigger button, the gate voltage can be lowered to turn on the MOSFET, and the output current of the battery pack flows to the load via the bypass switch control circuit.

[0008] In one of the embodiments, the battery box includes a box body and a box cover, and the box cover is buckled on the open end of the box body to form a relatively closed installation cavity; the battery pack and the protection plate are installed inside the box body, and the positive connection terminal, the negative connection terminal and the trigger button are installed on the box cover.

[0009] In one of the embodiments, the above-mentioned bypass switch control circuit also includes a pre-charging resistor R1, which is arranged between the drain of the MOSFET and the discharge end of the protection board to limit the instantaneous current on the bypass. When the MOSFET is turned on, the current will release a certain amount of electricity through the pre-charging resistor R1 to ensure that the power supply can be safely triggered when the battery pack is over-discharged.

[0010] In one of the embodiments, the pre-charging resistor R1 is set to 10-100Ω.

[0011] In one of the embodiments, the bypass switch control circuit further includes a protection resistor R2, which is disposed between the gate of the MOSFET and the ground to protect the gate of the MOSFET and ensure that an excessive current is not generated instantaneously when the trigger button is pressed.

[0012] In one of the embodiments, the over-discharge protection triggering low voltage threshold of the protection board is 2.5-2.7V, so as to ensure that the battery pack discharge can be automatically cut off for protection when the battery pack reaches below the over-discharge voltage.

[0013] In one of the embodiments, the above-mentioned forced start module also includes a detection circuit, and the input end of the detection circuit is electrically connected to the output end of the bypass switch control circuit, and the output end of the detection circuit is electrically connected to another input end of the protection board, so that the detection circuit can detect the output status of the bypass discharge channel of the battery pack, and when it is detected that the battery pack is in an over-discharge protection state and the trigger button is pressed, the protection board can be instantly powered and activated. When the protection board resumes power supply, the protection board can monitor the voltage of the battery pack in real time.

[0014] In one of the embodiments, the above-mentioned forced start module also includes an automatic recovery circuit, which is arranged in the bypass switch control circuit. When the battery pack reaches a safe discharge voltage through energy replenishment, the automatic recovery circuit drives the bypass switch control circuit to close, thereby restoring the battery pack to a normal discharge state.

[0015] In one of the embodiments, the automatic recovery circuit is based on MOSFET set as a MOS self-locking circuit to achieve the self-locking function of MOSFET. When the battery pack voltage returns to above the protection voltage, the MOSFET is automatically disconnected and the protection board returns to normal working state.

[0016] The above-mentioned battery pack with a forced start function is electrically connected to the positive electrode of the battery pack through one end of the forced start module, and the other end of the forced start module is electrically connected to the other input end of the protection board and the positive connection terminal on the surface of the battery box, thereby forming a bypass discharge channel relative to the protection board. Based on this, when the battery pack is fully discharged and enters the over-discharge protection state, the user can operate the forced start module to prompt the battery pack to exit the protection state and continue to release the remaining power, and provide emergency power to the external load while activating the protection board. Specifically, the forced start module includes a bypass switch control circuit, the input end of the bypass switch control circuit is electrically connected to the positive electrode of the battery pack, and the output end of the bypass switch control circuit is electrically connected to the other end of the protection board and the positive connection terminal on the surface of the battery box. Therefore, when the battery pack enters the protection state and the protection board performs over-discharge protection on the battery pack, the bypass switch control circuit can be triggered to prompt the battery pack to bypass the protection board and output power from the bypass switch control circuit to release the remaining power as an emergency power supply, thereby greatly improving the flexibility of the battery pack in emergency situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery pack with a forced start function in one embodiment; Figure 2 A schematic diagram of an exploded structure of a battery pack with a forced start function in one embodiment; Figure 3 A schematic diagram of the structure of a forced-start module of a battery pack with a forced-start function in one embodiment; Figure 4Schematic diagram of the bypass switch control circuit structure of a battery pack with a forced start function in one embodiment. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] See also Figures 1 to 4The present invention discloses a battery pack with a forced start function, which includes a battery box 100, a battery pack 200, a protection board 300 and a forced start module 400, wherein the battery pack, the protection board 300 and the forced start module 400 are all installed in the battery box 100; wherein the negative electrode of the battery pack 200 is electrically connected to the negative electrode connection terminal 130 on the surface of the battery box 100, the positive electrode of the battery pack 200 is electrically connected to the input end of the protection board 300, and the output end of the protection board 300 is electrically connected to the positive electrode connection terminal 140 on the surface of the battery box 100; one end of the forced start module 400 is electrically connected to the positive electrode of the battery pack 200, and the other end of the forced start module 400 is electrically connected to the other input end of the protection board 300 and the positive electrode connection terminal 140 on the surface of the battery box 100, thereby forming a bypass discharge channel relative to the protection board 300. Based on this, when the battery pack 200 is fully discharged and enters the over-discharge protection state, the user can operate the forced start module 400 to prompt the battery pack 200 to exit the protection state and continue to release the remaining power, and provide emergency power to the external load while activating the protection board 300. Specifically, the forced start module 400 includes a bypass switch control circuit 410, the input end of the bypass switch control circuit 410 is electrically connected to the positive electrode of the battery pack 200, and the output end of the bypass switch control circuit 410 is electrically connected to the other end of the protection board 300 and the positive connection terminal 140 on the surface of the battery box 100. Therefore, when the battery pack 200 enters the protection state and the protection board 300 performs over-discharge protection on the battery pack 200, the bypass switch control circuit 410 can be triggered to prompt the battery pack 200 to bypass the protection board 300 and output power from the bypass switch control circuit 410 to release the remaining power as an emergency power supply, thereby greatly improving the flexibility of the battery pack 200 in emergency situations. More specifically, the bypass switch control circuit 410 includes a trigger button 411 and a P-channel MOSFET, the source of the MOSFET is electrically connected to the positive electrode of the battery pack 200; the drain of the MOSFET is electrically connected to the discharge end of the protection board 300; the gate of the MOSFET is electrically connected to the trigger button 411; the trigger button 411 is arranged on the surface of the battery box 100 and is connected to the inside of the battery box 100, for manually triggering the bypass switch control circuit 410. When the user presses the trigger button 411, the gate voltage can be lowered to turn on the MOSFET, and the output current of the battery pack 200 flows to the load via the bypass switch control circuit 410, thereby realizing the output of the remaining power of the battery pack 200. In one embodiment, the battery box 100 includes a box body 110 and a box cover 120, and the box cover 120 is snapped onto the open end of the box body 110 to form a relatively closed installation cavity; specifically, the battery pack 200 and the protection plate 300 are both installed inside the box body 110, and the positive connection terminal 140, the negative connection terminal 130 and the trigger button 411 are all installed on the box cover 120, thereby forming a battery pack as a whole with a forced start function.

[0025] Furthermore, the bypass switch control circuit 410 also includes a pre-charge resistor R1, which is arranged between the drain of the MOSFET and the discharge end of the protection board 300, that is, the drain of the MOSFET is connected to the positive electrode of the load end through the pre-charge R1 to limit the instantaneous current on the bypass. When the MOSFET is turned on, the current will release a certain amount of electricity through the pre-charge resistor R1 to ensure that the power supply can be safely triggered when the battery pack 200 is over-discharged. In one embodiment, the pre-charge resistor R1 is set to 10-100Ω.

[0026] Furthermore, the bypass switch control circuit 410 also includes a protection resistor R2, which is arranged between the gate of the MOSFET and the ground. That is, the gate of the MOSFET is grounded through the protection resistor R2 to protect the gate of the MOSFET and ensure that excessive current is not generated instantaneously when the trigger button 411 is pressed.

[0027] In actual application, when the battery pack 200 is fully discharged, making the voltage of the battery pack 200 too low, the protection board 300 cuts off the load discharge channel, and the battery pack 200 no longer supplies power to the load; when the user presses the trigger button 411, the gate voltage of the MOSFET is pulled down, the MOSFET is turned on, and the bypass discharge channel is turned on; the current flows to the load through the charging resistor R1, providing a short-term power supply; when the voltage of the battery pack 200 returns to above the low-voltage protection point of the protection board 300, the protection board 300 automatically releases the protection, and the battery pack 200 resumes the normal discharge path.

[0028] In one embodiment, the over-discharge protection triggering low voltage threshold of the protection board 300 is 2.5-2.7V, so as to ensure that the discharge of the battery pack 200 can be automatically cut off for protection when the battery pack 200 reaches below the over-discharge voltage. When the user presses the trigger button 411, the bypass discharge channel is turned on, and the protection board 300 will release the protection of the battery pack 200 within the low voltage threshold, and the battery pack 200 will return to normal power supply to the load in a short time.

[0029] Furthermore, the forced start module 400 also includes a detection circuit 420, the input end of the detection circuit 420 is electrically connected to the output end of the bypass switch control circuit 410, and the output end of the detection circuit 420 is electrically connected to another input end of the protection board 300, so that the detection circuit 420 can detect the output status of the bypass discharge channel of the battery pack 200, and when it is detected that the battery pack 200 is in an over-discharge protection state and the trigger button 411 is pressed, the protection board 300 can be instantly powered and activated. When the protection board 300 resumes power supply, the protection board 300 can monitor the voltage of the battery pack 200 in real time.

[0030] Furthermore, the forced start module 400 also includes an automatic recovery circuit 430, which is arranged in the bypass switch control circuit 410. When the battery pack 200 reaches a safe discharge voltage or above through energy replenishment, the automatic recovery circuit drives the bypass switch control circuit 410 to close, so that the battery pack 200 returns to a normal discharge state. In one embodiment, the automatic recovery circuit 430 is set as a MOS self-locking circuit based on MOSFET to realize the self-locking function of MOSFET. When the voltage of the battery pack 200 returns to above the protection voltage, the MOSFET is automatically disconnected, and the protection board 300 returns to a normal working state.

[0031] In summary, the battery pack with a forced start function disclosed in the present invention is electrically connected to the positive electrode of the battery pack through one end of the forced start module, and the other end of the forced start module is electrically connected to the other input end of the protection board and the positive connection terminal on the surface of the battery box, thereby forming a bypass discharge channel relative to the protection board. Based on this, when the battery pack is fully discharged and enters the over-discharge protection state, the user can operate the forced start module to prompt the battery pack to exit the protection state and continue to release the remaining power, and provide emergency power to the external load while activating the protection board. Specifically, the forced start module includes a bypass switch control circuit, the input end of the bypass switch control circuit is electrically connected to the positive electrode of the battery pack, and the output end of the bypass switch control circuit is electrically connected to the other end of the protection board and the positive connection terminal on the surface of the battery box. Therefore, when the battery pack enters the protection state and the protection board performs over-discharge protection on the battery pack, the bypass switch control circuit can be triggered to prompt the battery pack to bypass the protection board and output power from the bypass switch control circuit to release the remaining power as an emergency power supply, thereby greatly improving the flexibility of the battery pack in emergency situations.

[0032] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack with a forced start function, characterized in that: include: A battery box, a battery pack, a protection board and a forced start module, wherein the battery pack, the protection board and the forced start module are all installed in the battery box; wherein the negative electrode of the battery pack is electrically connected to the negative electrode connection terminal on the surface of the battery box, the positive electrode of the battery pack is electrically connected to the input end of the protection board, and the output end of the protection board is electrically connected to the positive electrode connection terminal on the surface of the battery box; one end of the forced start module is electrically connected to the positive electrode of the battery pack, and the other end of the forced start module is electrically connected to the other input end of the protection board and the positive electrode connection terminal, thereby forming a bypass discharge channel relative to the protection board. When the battery pack is fully discharged and enters an over-discharge protection state, the user can operate the forced start module to prompt the battery pack to exit the protection state and continue to release the remaining power, thereby providing emergency power to the external load while stimulating the protection board; The forced start module includes a bypass switch control circuit, the input end of the bypass switch control circuit is electrically connected to the positive electrode of the battery pack, and the output end of the bypass switch control circuit is electrically connected to the other end of the protection board and the positive electrode connection terminal. Therefore, when the battery pack enters the protection state and the protection board performs over-discharge protection on the battery pack, the bypass switch control circuit can be triggered to cause the battery pack to bypass the protection board for electrical energy output.

2. The battery pack with forced start function according to claim 1, characterized in that: The bypass switch control circuit includes a trigger button and a P-channel MOSFET, the source of the MOSFET is electrically connected to the positive electrode of the battery pack; the drain of the MOSFET is electrically connected to the discharge end of the protection board; the gate of the MOSFET is electrically connected to the trigger button; the trigger button is arranged on the surface of the battery box and connected to the inside of the battery box, so as to manually trigger the bypass switch control circuit. When the user presses the trigger button, the gate voltage can be lowered to turn on the MOSFET, and the output current of the battery pack flows to the load via the bypass switch control circuit.

3. The battery pack with a forced start function according to claim 1, characterized in that: The battery box includes a box body and a box cover, and the box cover is buckled on the open end of the box body to form a relatively closed installation cavity; the battery pack and the protection plate are both installed inside the box body, and the positive connection terminal, the negative connection terminal and the trigger button are all installed on the box cover.

4. The battery pack with forced start function according to claim 2, characterized in that: The bypass switch control circuit also includes a pre-charge resistor R1, which is arranged between the drain of the MOSFET and the discharge end of the protection board to limit the instantaneous current on the bypass. When the MOSFET is turned on, the current will release a certain amount of electricity through the pre-charge resistor R1 to ensure that the power supply can be safely triggered when the battery pack is over-discharged.

5. The battery pack with forced start function according to claim 4, characterized in that: The pre-charge resistor R1 is set to 10-100Ω.

6. The battery pack with forced start function according to claim 5, characterized in that: The bypass switch control circuit also includes a protection resistor R2, which is arranged between the gate of the MOSFET and the ground to protect the gate of the MOSFET and ensure that an excessive current is not generated instantaneously when the trigger button is pressed.

7. The battery pack with forced start function according to claim 6, characterized in that: The over-discharge protection triggering low voltage threshold of the protection board is 2.5-2.7V, so as to ensure that the battery pack discharge can be automatically cut off for protection when the battery pack reaches below the over-discharge voltage.

8. The battery pack with forced start function according to claim 7, characterized in that: The forced start module also includes a detection circuit, the input end of the detection circuit is electrically connected to the output end of the bypass switch control circuit, and the output end of the detection circuit is electrically connected to another input end of the protection board, so that the detection circuit can detect the output condition of the bypass discharge channel of the battery pack, and when it is detected that the battery pack is in an over-discharge protection state and the trigger button is pressed, the protection board can be instantly powered and activated, and when the protection board resumes power supply, the protection board can monitor the voltage of the battery pack in real time.

9. The battery pack with forced start function according to claim 8, characterized in that: The forced start module also includes an automatic recovery circuit, which is arranged in the bypass switch control circuit. When the battery pack reaches a safe discharge voltage or above through energy replenishment, the automatic recovery circuit drives the bypass switch control circuit to close, thereby restoring the battery pack to a normal discharge state.

10. The battery pack with forced start function according to claim 9, characterized in that: The automatic recovery circuit is set as a MOS self-locking circuit based on MOSFET to realize the self-locking function of MOSFET. When the battery pack voltage returns to above the protection voltage, the MOSFET is automatically disconnected and the protection board returns to normal working state.

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