Battery protection device
By designing an expansion detection module and a battery protection circuit in the battery protection device and detecting battery expansion by using the conductor contact state, the problems of high battery expansion detection cost and complex design in the prior art are solved, and effective protection of the battery and cost reduction are achieved.
Patent Information
- Application Number
- CN202421430404.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-20
AI Technical Summary
The existing battery expansion detection methods are costly and complex in design, making them difficult to apply on small products.
A battery protection device is designed, including a battery protection circuit and an expansion detection module, to detect the battery expansion through the contact state of a plurality of conductors, and to perform undervoltage protection operation when a trigger condition is reached.
It realizes effective detection and protection of battery expansion, reduces costs, facilitates application on small products, and avoids additional detection devices and complex circuit designs.
Smart Images
Figure CN222763628U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of battery management, in particular to a battery protection device. Background Art
[0002] Lithium batteries are prone to battery aging after long-term use, and the gas produced by internal side reactions will cause the battery to swell, which may cause the battery to rupture and lead to battery short circuit failure. Existing battery expansion detection is mostly achieved by setting up photosensitive, pressure-sensitive and other detection devices, but this method is costly and the circuit design is also complex, which is not convenient for application in small products. Utility Model Content
[0003] The main purpose of the utility model is to provide a battery protection device, aiming to solve the problems of high cost and complex design of the detection method for battery expansion in the prior art.
[0004] To achieve the above-mentioned object, the utility model provides a battery protection device, which is connected to a target battery; the battery protection device comprises a battery protection circuit and an expansion detection module; the expansion detection module comprises a plurality of conductors, the conductors comprising a first conductor, a second conductor and a third conductor; the power supply end of the battery protection circuit is connected to the positive electrode of the target battery, the power supply end of the battery protection circuit is also connected to the first conductor, the negative electrode of the target battery is connected to the second conductor, and at least one of the first conductor, the second conductor and the third conductor is arranged on the target battery; wherein:
[0005] The conductor disposed on the target battery is displaced as the target battery expands, and when the target battery does not expand to meet a trigger condition, the first conductor and the second conductor are not in contact, and when the target battery expands to meet the trigger condition, the first conductor, the second conductor, and the third conductor are in contact;
[0006] The battery protection circuit is used to perform an undervoltage protection operation when the first conductor, the second conductor, and the third conductor are in contact.
[0007] Optionally, the battery protection device further includes a shell, and the target battery is arranged in the shell; the first conductor and the second conductor are arranged on the target battery, and the first conductor and the second conductor do not contact each other; the third conductor is arranged on the inner wall of the shell relative to the first conductor and the second conductor; when the target battery expands, it drives the first conductor and the second conductor to move in the direction of the third conductor; when the third conductor contacts the first conductor and the second conductor, the first conductor and the second conductor are connected.
[0008] Optionally, the battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor and the second conductor are arranged on the inner wall of the shell, and the first conductor and the second conductor do not contact each other; the third conductor is arranged on the target battery relative to the first conductor and the second conductor, and the target battery drives the third conductor to move in the direction of the first conductor and the second conductor when expanding, and the third conductor conducts the first conductor and the second conductor when contacting the first conductor and the second conductor.
[0009] Optionally, the battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor and the third conductor are arranged on the target battery, and the first conductor is in contact with the third conductor, and the second conductor is arranged on the inner wall of the shell relative to the first conductor and the second conductor, and the target battery drives the first conductor and the third conductor to move in the direction of the second conductor when expanding, and the second conductor is conductive to the first conductor when contacting the third conductor.
[0010] Optionally, the projection of one of the first conductor and the second conductor on the battery is a circle, the projection of the other on the battery is a ring surrounding the first conductor, and the projection of the third conductor on the battery at least partially overlaps with the projections of the first conductor and the second conductor.
[0011] Optionally, the first conductor, the second conductor, and the third conductor are made of copper.
[0012] Optionally, the battery protection circuit includes a chip module and a switch module; the power supply end of the chip module is connected to the positive electrode of the target battery, the power supply end of the chip module is connected to the negative electrode of the target battery through the expansion detection module, the grounding end of the chip module is grounded, the output end of the chip module is connected to the control end of the switch module, and the switch module is connected between the output negative end and the negative electrode of the target battery.
[0013] Optionally, the chip module includes a battery protection chip, a first resistor, a second resistor and a first capacitor, wherein:
[0014] The power supply end of the battery protection chip is connected to the positive electrode of the target battery through the second resistor, the power supply end of the battery protection chip is also connected to the common end of the battery protection chip through the first capacitor, the power supply end of the battery protection chip is also connected to the negative electrode of the target battery through the expansion detection module, the ground end of the battery protection chip is grounded, and the output end of the battery protection chip is connected to the control end of the switch module.
[0015] Optionally, the switch module includes a first switch tube and a second switch tube, wherein:
[0016] The control end of the first switch tube is connected to the first output end of the chip module, the control end of the second switch tube is connected to the second output end of the chip module, the input end of the first switch tube is connected to the input end of the second switch tube, the output end of the first switch tube is connected to the negative electrode of the target battery, and the output end of the second switch tube is connected to the output negative end.
[0017] Optionally, the first switch tube is an NMOS tube, the control end of the first switch tube is a gate of the NMOS tube, the input end of the first switch tube is a drain of the NMOS tube, and the output end of the first switch tube is a source of the NMOS tube;
[0018] The second switch tube is an NMOS tube, the control end of the second switch tube is the gate of the NMOS tube, the input end of the second switch tube is the drain of the NMOS tube, and the output end of the second switch tube is the source of the NMOS tube.
[0019] The utility model provides a battery protection device, which is connected to a target battery; the battery protection device comprises a battery protection circuit and an expansion detection module; the expansion detection module comprises a plurality of conductors, the conductors comprising a first conductor, a second conductor and a third conductor; the power supply end of the battery protection circuit is connected to the positive electrode of the target battery, the power supply end of the battery protection circuit is also connected to the first conductor, the negative electrode of the target battery is connected to the second conductor, and at least one of the first conductor, the second conductor and the third conductor is arranged on the target battery; wherein: the conductor arranged on the target battery is displaced as the target battery expands, and is displaced when the target battery expands. When the target battery has not expanded to meet the trigger condition, the first conductor and the second conductor are not in contact, and when the target battery expands to meet the trigger condition, the first conductor, the second conductor, and the third conductor are in contact; the battery protection circuit is used to perform an undervoltage protection operation when the first conductor, the second conductor, and the third conductor are in contact. By setting an expansion detection module, when the target battery expands to a certain extent, the power supply end of the battery protection device and the negative electrode of the target battery are connected, thereby utilizing the undervoltage protection principle of the battery protection device to protect the target battery. At the same time, there is no need to set up additional detection devices or perform additional circuit design, which reduces costs and facilitates application in small products. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0021] Figure 1 This is a functional module diagram of an embodiment of a battery protection device of the utility model;
[0022] Figure 2 This is a schematic diagram of the arrangement of the expansion detection module in the battery protection device of the utility model;
[0023] Figure 3 The battery protection device of the utility model is applied in Figure 1 Circuit structure diagram in the embodiment.
[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.
[0025] Description of Figure Numbers:
[0026] Label name Label name 100 Battery protection circuit R1~R2 First resistor~Second resistor 110 Chip module C1 First capacitor 120 Switch module Q1~Q2 The first switch tube ~ the second switch tube 200 Swelling detection module U1 Battery protection chip D1~D3 First conductor to third conductor DETAILED DESCRIPTION
[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] The utility model provides a battery protection device, see Figure 1 , Figure 1 This is a functional module diagram of an embodiment of the battery protection device of the utility model. In this embodiment, the battery protection device is connected to a target battery; the battery protection device includes a battery protection circuit 100 and an expansion detection module 200; the expansion detection module 200 includes a plurality of conductors, the conductors including a first conductor D1, a second conductor D2 and a third conductor D3; the power supply end of the battery protection circuit 100 is connected to the positive electrode of the target battery, the power supply end of the battery protection circuit 100 is also connected to the first conductor D1, the negative electrode of the target battery is connected to the second conductor D2, and at least one of the first conductor D1, the second conductor D2 and the third conductor D3 is arranged on the target battery; wherein:
[0032] The conductor disposed on the target battery is displaced as the target battery expands, and when the target battery does not expand to meet the trigger condition, the first conductor D1 and the second conductor D2 are not in contact, and when the target battery expands to meet the trigger condition, the first conductor D1, the second conductor D2, and the third conductor D3 are in contact;
[0033] The battery protection circuit 100 is used to perform an undervoltage protection operation when the first conductor D1, the second conductor D2, and the third conductor D3 are in contact.
[0034] The battery protection circuit 100 is used to detect the state of the target battery and perform undervoltage protection operation when the battery is abnormal. It can be understood that the battery protection circuit 100 can be set based on actual needs. In this embodiment, the expansion protection of the target battery is mainly achieved through undervoltage protection.
[0035] The target battery is the object of expansion protection.
[0036] The expansion detection module 200 detects the expansion degree of the target battery. It is understandable that the target battery deforms when it expands, and the expansion detection module 200 is arranged on the target battery. Therefore, the position of the expansion detection module and its relative relationship with the surrounding environment will change as the target battery expands. Therefore, the expansion detection module 200 can be arranged by taking advantage of this feature to realize the detection of the expansion degree of the target battery.
[0037] It can be understood that the first conductor D1 is connected to the power supply terminal of the battery protection circuit 100, and the second conductor D2 is connected to the negative electrode of the target battery. When the first conductor D1 is in contact with the second conductor D2, the power supply terminal of the battery protection circuit 100 is connected to the negative electrode of the target battery through the first conductor D1 and the second conductor D2. At this time, the power supply terminal of the battery protection circuit 100 detects the negative electrode voltage, triggering the undervoltage protection operation of the battery protection circuit; when the first conductor D1 is not in contact with the second conductor D2, the power supply terminal of the battery protection circuit 100 is not connected to the negative electrode of the target battery, and the target battery operates normally.
[0038] That is, the contact state of the first conductor D1 and the second conductor D2 can affect the triggering of the undervoltage protection operation of the battery protection circuit 100. At the same time, the third conductor D3 serves as a contact medium between the first conductor D1 and the second conductor D2. When the first conductor D1 and the second conductor D2 are both in contact with the third conductor D3, the first conductor D1 and the second conductor D2 are connected through the third conductor D3, thereby triggering the power supply end of the battery protection circuit 100 to be connected to the negative electrode of the target battery.
[0039] If at least one of the first conductor D1, the second conductor D2, and the third conductor D3 is disposed on the target battery, the conductor disposed on the target battery will move as the target battery expands. It can be understood that as the conductor moves, the relative positions of the first conductor D1 and the second conductor D2 gradually approach each other. When the target battery expands to a certain extent, that is, when the conductor moves to a certain extent, the first conductor D1, the second conductor D2, and the third conductor D3 are in contact, and the first conductor D1 is connected to the second conductor D2. In this embodiment, a trigger condition is set to determine the degree of expansion of the target battery when the first conductor D1, the second conductor D2, and the third conductor D3 are in contact.
[0040] The trigger condition is used to indicate the maximum expansion degree allowed for the target battery; when the target battery expands to meet the trigger condition, it is considered that the target battery has reached or exceeded the maximum allowable expansion degree. At this time, a battery protection operation needs to be performed to prevent the target battery from continuing to expand and ensure the safety of battery use; the trigger condition can be set based on actual needs.
[0041] The battery protection operation is used to stop the target battery from working, and can be specifically set based on needs, such as disconnecting the output channel of the target battery.
[0042] In this embodiment, by providing an expansion detection module 200, when the expansion of the target battery reaches a certain degree, the power supply end of the battery protection device and the negative electrode of the target battery are connected, thereby utilizing the undervoltage protection principle of the battery protection device to protect the target battery. At the same time, there is no need to provide additional detection devices or perform additional circuit design, which reduces costs and facilitates application in small products.
[0043] Furthermore, the battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor D1 and the second conductor D2 are arranged on the target battery, and the first conductor D1 and the second conductor D2 are not in contact with each other, and the third conductor D3 is arranged on the inner wall of the shell relative to the first conductor D1 and the second conductor D2, and when the target battery expands, it drives the first conductor D1 and the second conductor D2 to move in the direction of the third conductor D3, and when the third conductor D3 contacts the first conductor D1 and the second conductor D2, it conducts the first conductor D1 and the second conductor D2.
[0044] The first conductor D1 and the second conductor D2 are arranged on the target battery, so the first conductor D1 and the second conductor D2 are arranged to move with the expansion of the target battery; the third conductor D3 is arranged on the inner wall of the shell, and the third conductor D3 will not move with the expansion of the target battery. At the same time, the third conductor D3 is arranged relative to the first conductor D1 and the second conductor D2, so the first conductor D1 and the second conductor D2 are close to the third conductor D3 when moving.
[0045] When the target battery has not expanded to meet the trigger condition, the first conductor D1 and the second conductor D2 are not in contact with each other, so the power terminal of the battery protection circuit 100 is disconnected from the negative electrode of the target battery, and the battery operates normally; when the target battery expands to meet the trigger condition, the first conductor D1, the second conductor D2, and the third conductor D3 are in contact, and the first conductor D1 is connected to the second conductor D2 through the third conductor D3. At this time, the power terminal of the battery protection circuit 100 is connected to the negative electrode of the target battery through the first conductor D1, the second conductor D2, and the third conductor D3, and the power terminal of the battery protection circuit 100 is pulled down, triggering the undervoltage protection.
[0046] Furthermore, the battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor D1 and the second conductor D2 are arranged on the inner wall of the shell, and the first conductor D1 and the second conductor D2 do not contact each other; the third conductor D3 is arranged on the target battery relative to the first conductor D1 and the second conductor D2, and when the target battery expands, the third conductor D3 drives the third conductor D3 to move in the direction of the first conductor D1 and the second conductor D2, and when the third conductor D3 contacts the first conductor D1 and the second conductor D2, the first conductor D1 and the second conductor D2 are connected.
[0047] The first conductor D1 and the second conductor D2 are arranged on the inner wall of the shell, and the first conductor D1 and the second conductor D2 will not move with the expansion of the target battery; the third conductor D3 is arranged on the target battery, so the third conductor D3 moves with the expansion of the target battery; at the same time, the third conductor D3 is arranged relative to the first conductor D1 and the second conductor D2, so the third conductor D3 approaches the first conductor D1 and the second conductor D2 when moving.
[0048] The battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor D1 and the third conductor D3 are arranged on the target battery, and the first conductor D1 is in contact with the third conductor D3, and the second conductor D2 is arranged on the inner wall of the shell relative to the first conductor D1 and the second conductor D2. When the target battery expands, it drives the first conductor D1 and the third conductor D3 to move in the direction of the second conductor D2, and when the second conductor D2 contacts the third conductor D3, it is conductive to the first conductor D1.
[0049] In this embodiment, the first conductor D1 is disposed in contact with the third conductor D3. At this time, the second conductor D2 can be electrically connected to the first conductor D1 as long as it contacts with any one of the first conductor D1 and the third conductor D3.
[0050] The second conductor D2 is arranged on the inner wall of the shell, and the second conductor D2 will not move with the expansion of the target battery; the first conductor D1 and the third conductor D3 are arranged on the target battery, so the first conductor D1 and the third conductor D3 move with the expansion of the target battery; at the same time, the second conductor D2 is arranged relative to the first conductor D2, so the first conductor D1 and the third conductor D3 approach the second conductor D2 when moving.
[0051] In other embodiments, the first conductor D1 and the third conductor D3 may be disposed on the inner wall of the housing, and the second conductor D2 may be disposed on the target battery.
[0052] The first conductor D1 and the third conductor D3 are arranged on the inner wall of the shell, and the first conductor D1 and the third conductor D3 will not move with the expansion of the target battery; the second conductor D2 is arranged on the target battery, so the second conductor D2 moves with the expansion of the target battery; at the same time, the second conductor D2 is arranged relative to the first conductor D1 and the third conductor D3, so the second conductor D2 approaches the first conductor D1 and the third conductor D3 when moving.
[0053] Further,
[0054] The specific setting position of the third conductor D3 is determined based on the positions of the first conductor D1 and the second conductor D2. For example, if the first conductor D1 and the second conductor D2 are set on the side surface of the target battery, and the target battery is set in the shell, then in order to make the first conductor D1 and the second conductor D2 contact with the third conductor D3 after the target battery expands, the third conductor D3 is set on the inner wall of the shell, and the third conductor D3 is set opposite to the first conductor D1 and the second conductor D2. For another example, when the first conductor D1 and the second conductor D2 are set on the top of the target battery, the third conductor D3 is set on the top of the inner wall of the shell and is set opposite to the first conductor D1 and the second conductor D2.
[0055] In other embodiments, the first conductor D1 and the second conductor D2 may be disposed on the housing, and the third conductor D3 may be disposed on the target battery.
[0056] Further, see Figure 2 The projection of the first conductor D1 on the battery is a circle, the projection of the second conductor D2 on the battery is a ring surrounding the first conductor D1, and the projection of the third conductor D3 on the battery at least partially overlaps with the projections of the first conductor D1 and the second conductor D2.
[0057] The first conductor D1 and the second conductor D2 are both arranged on the outer surface of the battery, and the projection of the second conductor D2 on the battery is a ring surrounding the first conductor D1, thereby ensuring that the first conductor D1 and the second conductor D2 are not conductive when there is no contact with the third conductor D3. At the same time, the projection of the third conductor D3 on the battery at least partially overlaps with the projections of the first conductor D1 and the second conductor D2, thereby ensuring that the first conductor D1 and the second conductor D2 are conductive when the battery expands to meet the triggering condition; it can be understood that in order to improve reliability, the projection of the third conductor D3 on the battery can be arranged to cover the first conductor D1 and the second conductor D2, thereby increasing the contactable area between the conductors, thereby avoiding the problem that the third conductor D3 cannot connect with the first conductor D1 and the second conductor D2 due to deformation under special circumstances.
[0058] Furthermore, the first conductor D1 , the second conductor D2 , and the third conductor D3 are made of copper.
[0059] In order to ensure good conductivity, copper is selected as the material of the first conductor D1, the second conductor D2, and the third conductor D3; in practical applications, the materials used for the first conductor D1, the second conductor D2, and the third conductor D3 can be selected according to actual needs as long as the conductivity conditions are met.
[0060] Further, see Figure 3 The battery protection circuit 100 includes a chip module 110 and a switch module 120; the power supply end of the chip module 110 is connected to the positive electrode of the target battery, the power supply end of the chip module 110 is connected to the negative electrode of the target battery through the expansion detection module 200, the grounding end of the chip module 110 is grounded, the output end of the chip module 110 is connected to the control end of the switch module 120, and the switch module 120 is connected between the output negative end and the negative electrode of the target battery.
[0061] The chip module 110 is used to trigger relevant protection operations, while the switch module 120 specifically performs the protection operations.
[0062] The output negative terminal is the port for connecting the target battery to the load. In this embodiment, a switch module 120 is provided to be connected between the output negative terminal and the negative electrode of the target battery. When the switch module 120 is turned on, the negative electrode of the target battery can be connected to the load, and the target battery supplies power to the load normally. When the switch module 120 is disconnected, the negative electrode of the target battery cannot be connected to the load. Therefore, a current loop cannot be formed between the target battery and the load, so that the target battery is in a stopped state.
[0063] Furthermore, the chip module 110 includes a battery protection chip U1, a first resistor R1, a second resistor R2 and a first capacitor C1, wherein:
[0064] The power supply end of the battery protection chip U1 is connected to the positive electrode of the target battery through the second resistor R2, the power supply end of the battery protection chip U1 is also connected to the common end of the battery protection chip U1 through the first capacitor C1, the power supply end of the battery protection chip U1 is also connected to the negative electrode of the target battery through the expansion detection module 200, the ground end of the battery protection chip U1 is grounded, and the output end of the battery protection chip U1 is connected to the control end of the switch module 120.
[0065] The specific model of the battery protection chip U1 can be selected based on actual needs and is not limited here.
[0066] The power supply end of the battery protection chip U1 is powered by the target battery. At the same time, the battery protection chip U1 also determines the working state of the target battery based on the power supply end voltage. When the power supply end voltage is too high, overvoltage protection is triggered. When the power supply end voltage is too low, undervoltage protection is triggered.
[0067] It can be understood that if the positive electrode of the target battery is directly connected to the power terminal of the battery protection chip U1, when the expansion detection module 200 is turned on, the power terminal of the battery protection chip U1 is simultaneously connected to the positive and negative electrodes of the target battery, causing the target battery to be short-circuited. Therefore, the first resistor R1 is set so that when the expansion detection module 200 is turned on, the target battery will not be short-circuited, thereby reducing the voltage at the power terminal of the battery protection chip U1 and triggering undervoltage protection.
[0068] Furthermore, the switch module 120 includes a first switch tube Q1 and a second switch tube Q2, wherein:
[0069] The control end of the first switch tube Q1 is connected to the first output end of the chip module 110, the control end of the second switch tube Q2 is connected to the second output end of the chip module 110, the input end of the first switch tube Q1 is connected to the input end of the second switch tube Q2, the output end of the first switch tube Q1 is connected to the negative electrode of the target battery, and the output end of the second switch tube Q2 is connected to the output negative end.
[0070] When the first switch tube Q1 and the second switch tube Q2 are turned off, the negative electrode of the target battery is disconnected from the output negative terminal, and when the first switch tube Q1 and the second switch tube Q2 are turned on, the negative electrode of the target battery is connected to the output negative terminal.
[0071] Further, the first switch tube Q1 is an NMOS tube, the control end of the first switch tube Q1 is the gate of the NMOS tube, the input end of the first switch tube Q1 is the drain of the NMOS tube, and the output end of the first switch tube Q1 is the source of the NMOS tube;
[0072] The second switch tube Q2 is an NMOS tube, the control end of the second switch tube Q2 is the gate of the NMOS tube, the input end of the second switch tube Q2 is the drain of the NMOS tube, and the output end of the second switch tube Q2 is the source of the NMOS tube.
[0073] In this embodiment, the first switch tube Q1 and the second switch tube Q2 are NMOS tubes as an example for description. In practical applications, other switch devices may also be selected based on actual needs.
[0074] based on Figure 3 The overall principle of this application is explained:
[0075] When the battery has not expanded to meet the trigger condition, the first conductor D1 is disconnected from the second conductor D2, the power supply end of the battery protection chip U1 is the target battery voltage, the battery protection chip U1 outputs a low level to the first switch tube Q1 and the second switch tube Q2, the first switch tube Q1 and the second switch tube Q2 are turned on, at this time, the negative electrode of the target battery is connected to the output negative terminal, and the target battery normally supplies power to the load;
[0076] When the battery expands to meet the trigger condition, the first conductor D1 and the second conductor D2 are connected through the third conductor D3, and the power supply end of the battery protection chip U1 is connected to the negative electrode of the target battery through the first conductor D1, the third conductor D3, and the second conductor D2. At this time, the power supply end of the battery protection chip U1 is pulled down, triggering the undervoltage protection, and the power supply end of the battery protection chip U1 outputs a high level to the first switch tube Q1 and the second switch tube Q2. The first switch tube Q1 is turned on with the second switch tube Q2. At this time, the negative output terminal of the negative electrode of the target battery is disconnected, and a current loop cannot be formed between the target battery and the load, and the target battery stops working;
[0077] If the conduction between the first conductor D1 and the second conductor D2 is a false touch, after the false touch ends, the first conductor D1 and the second conductor D2 return to a non-contact state. At this time, due to the design of the battery protection chip U1, the target battery is still in a stopped working state. When the power is connected, the battery protection chip U1 controls the first switch tube Q1 and the second switch tube Q2 to be turned on, and the target battery supplies power to the load again.
[0078] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or system including the element. The serial numbers of the above-mentioned embodiments of the utility model are for description only and do not represent the advantages and disadvantages of the embodiments.
[0079] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A battery protection device, characterized in that: The battery protection device is connected to a target battery; the battery protection device includes a battery protection circuit and an expansion detection module; the expansion detection module includes a plurality of conductors, the conductors including a first conductor, a second conductor and a third conductor; the power supply end of the battery protection circuit is connected to the positive electrode of the target battery, the power supply end of the battery protection circuit is also connected to the first conductor, the negative electrode of the target battery is connected to the second conductor, and at least one of the first conductor, the second conductor and the third conductor is arranged on the target battery; wherein: The conductor disposed on the target battery is displaced as the target battery expands, and when the target battery does not expand to meet a trigger condition, the first conductor and the second conductor are not in contact, and when the target battery expands to meet the trigger condition, the first conductor, the second conductor, and the third conductor are in contact; The battery protection circuit is used to perform an undervoltage protection operation when the first conductor, the second conductor, and the third conductor are in contact.
2. The battery protection device according to claim 1, characterized in that: The battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor and the second conductor are arranged on the target battery, and the first conductor and the second conductor do not contact each other, and the third conductor is arranged on the inner wall of the shell relative to the first conductor and the second conductor. When the target battery expands, it drives the first conductor and the second conductor to move in the direction of the third conductor, and when the third conductor contacts the first conductor and the second conductor, the first conductor and the second conductor are connected.
3. The battery protection device according to claim 1, characterized in that: The battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor and the second conductor are arranged on the inner wall of the shell, and the first conductor and the second conductor do not contact each other; the third conductor is arranged on the target battery relative to the first conductor and the second conductor, and the target battery drives the third conductor to move in the direction of the first conductor and the second conductor when expanding, and the third conductor conducts the first conductor and the second conductor when contacting the first conductor and the second conductor.
4. The battery protection device according to claim 1, characterized in that: The battery protection device also includes a shell, and the target battery is arranged in the shell; the first conductor and the third conductor are arranged on the target battery, and the first conductor is in contact with the third conductor, and the second conductor is arranged on the inner wall of the shell relative to the first conductor and the second conductor, and when the target battery expands, it drives the first conductor and the third conductor to move toward the direction of the second conductor, and when the second conductor contacts the third conductor, it conducts with the first conductor.
5. The battery protection device according to any one of claims 2 to 4, characterized in that: The projection of one of the first conductor and the second conductor on the battery is a circle, the projection of the other on the battery is a ring surrounding the first conductor, and the projection of the third conductor on the battery at least partially overlaps with the projections of the first conductor and the second conductor.
6. The battery protection device according to claim 2, characterized in that: The first conductor, the second conductor and the third conductor are made of copper.
7. The battery protection device according to claim 1, characterized in that: The battery protection circuit includes a chip module and a switch module; the power supply end of the chip module is connected to the positive electrode of the target battery, the power supply end of the chip module is connected to the negative electrode of the target battery through the expansion detection module, the grounding end of the chip module is grounded, the output end of the chip module is connected to the control end of the switch module, and the switch module is connected between the output negative end and the negative electrode of the target battery.
8. The battery protection device according to claim 7, characterized in that: The chip module includes a battery protection chip, a first resistor, a second resistor and a first capacitor, wherein: The power supply end of the battery protection chip is connected to the positive electrode of the target battery through the second resistor, the power supply end of the battery protection chip is also connected to the common end of the battery protection chip through the first capacitor, the power supply end of the battery protection chip is also connected to the negative electrode of the target battery through the expansion detection module, the ground end of the battery protection chip is grounded, and the output end of the battery protection chip is connected to the control end of the switch module.
9. The battery protection device according to claim 7, characterized in that: The switch module includes a first switch tube and a second switch tube, wherein: The control end of the first switch tube is connected to the first output end of the chip module, the control end of the second switch tube is connected to the second output end of the chip module, the input end of the first switch tube is connected to the input end of the second switch tube, the output end of the first switch tube is connected to the negative electrode of the target battery, and the output end of the second switch tube is connected to the output negative end.
10. The battery protection device according to claim 9, characterized in that: The first switch tube is an NMOS tube, the control end of the first switch tube is the gate of the NMOS tube, the input end of the first switch tube is the drain of the NMOS tube, and the output end of the first switch tube is the source of the NMOS tube; The second switch tube is an NMOS tube, the control end of the second switch tube is the gate of the NMOS tube, the input end of the second switch tube is the drain of the NMOS tube, and the output end of the second switch tube is the source of the NMOS tube.