Lithium battery protection packaging body, power supply device and electronic wearable equipment

Abstract

The utility model discloses a lithium battery protection packaging body, a power supply device and electronic wearable equipment. The lithium battery protection packaging body is used for carrying out charging and discharging protection on a lithium battery, and comprises a plastic packaging body which is provided with an accommodating cavity; the lithium battery protection chip is used for carrying out over-charge protection and over-discharge protection on the lithium battery, is accommodated in the plastic package body and is provided with a driving pin and an output pin; the input pin is arranged on the plastic package body, one end of the input pin is connected with a driving pin of the lithium battery protection chip, and the other end of the input pin is used for being connected with external driving equipment; and the protection pin is arranged on the plastic package body, one end of the protection pin is connected with an output pin of the lithium battery protection chip, and the other end of the protection pin is used for being connected with a lithium battery. According to the utility model, the problems that the chip packaging structure of the lithium battery protection plate is heavy in weight and large in occupied space are solved.

Description

Technical Field

[0001] This utility model relates to the field of circuit packaging, and in particular to a lithium battery protection package, a power supply device, and an electronic wearable device. Background Technology

[0002] With the development of electronic industry technology, lithium batteries are being used more and more widely in people's daily lives, and lithium battery protection boards are also being used extensively. The chips of lithium battery protection boards usually adopt SOT23-6, TSSOP8, DFN3 and other packaging forms. Then, the chips and resistors and capacitors are placed on the circuit board. The processing steps are many, and they occupy a lot of space and are heavy. Wearable devices have requirements for the size and weight of the power supply, which makes them unsuitable for wearable devices with small body space. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a lithium battery protection package, a power supply device and an electronic wearable device to solve the problems of large structural weight and large space occupation of the chip package of lithium battery protection board.

[0004] The technical solution of this utility model is as follows:

[0005] A lithium battery protection package for charging and discharging protection of lithium batteries, the lithium battery protection package comprising:

[0006] A molding compound having a receiving cavity;

[0007] A lithium battery protection chip for overcharge and over-discharge protection of lithium batteries is housed in the plastic package. The lithium battery protection chip has drive pins and output pins.

[0008] An input pin is disposed on the plastic package. One end of the input pin is connected to the drive pin of the lithium battery protection chip, and the other end of the input pin is used to connect to an external drive device.

[0009] A protection pin is disposed on the plastic package. One end of the protection pin is connected to the output pin of the lithium battery protection chip, and the other end of the protection pin is used to connect to the lithium battery.

[0010] The lithium battery protection chip is used to provide overcharge and over-discharge protection for the lithium battery.

[0011] Optionally, the molding compound includes:

[0012] A housing having a receiving cavity;

[0013] A sealing structure is provided at the joint of the housing, and the sealing structure is used to isolate the accommodating cavity space of the housing from the external environment.

[0014] Optionally, the housing has a pin lead-out hole with a sealing structure; one end of the input pin is connected to the drive pin of the lithium battery protection chip through the pin lead-out hole, and one end of the protection pin is connected to the output pin of the lithium battery protection chip through the pin lead-out hole.

[0015] Optionally, the protection pin includes:

[0016] The first pin has one end connected to the output pin of the lithium battery protection chip, and the other end is used to connect to the positive terminal of the lithium battery.

[0017] The second pin has one end connected to the output pin of the lithium battery protection chip, and the other end connected to the negative terminal of the lithium battery.

[0018] Optionally, the lithium battery protection package further includes:

[0019] An anti-reverse circuit is disposed within the plastic package. The input terminal of the anti-reverse circuit is used to connect to a power supply, and the output terminal of the anti-reverse circuit is connected to the input terminal of the lithium battery protection chip. The anti-reverse circuit is used to provide reverse connection protection for the lithium battery protection chip.

[0020] Optionally, the anti-reverse circuit includes a first PMOS transistor and a first electrostatic discharge diode. The gate of the first PMOS transistor is grounded, the source of the first PMOS transistor and the first terminal of the first electrostatic discharge diode are connected to the input terminal of the lithium battery protection chip, the drain of the first PMOS transistor is used to connect to the power supply, and the second and third terminals of the first electrostatic discharge diode are grounded.

[0021] Optionally, the encapsulant is an epoxy resin encapsulant.

[0022] Optionally, a buffer layer is provided inside the cavity of the encapsulation, and the buffer layer covers the surface of the lithium battery protection chip.

[0023] This utility model also proposes a power supply device, including a lithium battery pack and a lithium battery protection package as described above, wherein the lithium battery pack is connected to the protection pins in the lithium battery protection package.

[0024] This utility model also proposes an electronic wearable device, including the power supply device as described above.

[0025] This utility model's technical solution comprises a lithium battery protection package consisting of a plastic encapsulation body, a lithium battery protection chip, input pins, and protection pins. The plastic encapsulation body forms an accommodating cavity. The lithium battery protection chip, used for overcharge and over-discharge protection of the lithium battery, is housed within the plastic encapsulation body. The lithium battery protection chip has drive pins and output pins. The input pins are located on the plastic encapsulation body; one end of the input pin connects to the drive pin of the lithium battery protection chip, and the other end connects to an external drive device. The protection pins are located on the plastic encapsulation body; one end of the protection pin connects to the output pin of the lithium battery protection chip, and the other end connects to the lithium battery. Thus, this utility model's lithium battery protection package can directly encapsulate the lithium battery protection chip within the plastic encapsulation body, eliminating the need to mount the lithium battery protection chip on a circuit board, thereby reducing the structural weight of the lithium battery protection package and minimizing its space occupation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a functional module schematic diagram of an embodiment of the lithium battery protection package of this utility model.

[0028] Figure 2 This is a functional module schematic diagram of another embodiment of the lithium battery protection package of this utility model.

[0029] Figure 3 This is a functional module schematic diagram of another embodiment of the lithium battery protection package of this utility model.

[0030] Figure 4 This is a functional module schematic diagram of another embodiment of the lithium battery protection package of this utility model.

[0031] Figure 5 This is a schematic diagram of the anti-reverse circuit in the lithium battery protection package of this utility model.

[0032] Explanation of reference numerals in the attached figures: 10, encapsulation; 11, housing; 12, sealing structure; 20, lithium battery protection chip; 30, input pin; 40, protection pin; 41, first pin; 42, second pin; 50, pin lead-out hole; 60, anti-reverse circuit; 70, buffer layer; P1, first PMOS transistor; ESD, first electrostatic discharge diode. Detailed Implementation

[0033] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0035] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0036] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0037] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] With the development of electronic industry technology, lithium batteries are being used more and more widely in people's daily lives, and lithium battery protection boards are also being used extensively. The chips of lithium battery protection boards are usually packaged in SOT23-6, TSSOP8, DFN3 and other forms. Then the chips and resistors and capacitors are placed on the circuit board. The processing steps are many, and they occupy a lot of space and are heavy. In wearable devices, there are requirements for the size and weight of the power supply.

[0039] To address the aforementioned issues, this invention proposes a lithium battery protection package for protecting lithium batteries during charging and discharging.

[0040] Reference Figure 1 In one embodiment, the lithium battery protection package includes:

[0041] The molding compound 10 has a receiving cavity;

[0042] A lithium battery protection chip 20 is housed within the plastic encapsulation 10, and the lithium battery protection chip 20 has drive pins and output pins;

[0043] An input pin 30 is disposed on the plastic package 10. One end of the input pin 30 is connected to the drive pin of the lithium battery protection chip 20, and the other end of the input pin 30 is used to connect to an external drive device.

[0044] A protection pin 40 is disposed on the plastic package 10. One end of the protection pin 40 is connected to the output pin of the lithium battery protection chip 20, and the other end of the protection pin 40 is used to connect to the lithium battery.

[0045] The lithium battery protection chip 20 is used for overcharge protection and over-discharge protection of the lithium battery.

[0046] In this embodiment, the molding material of the encapsulation body 10 can be a base resin, such as epoxy resin, which has excellent electrical insulation, adhesion, and chemical stability. It can firmly encapsulate the chip and other internal structures, preventing the intrusion of external moisture, dust, and chemicals, and protecting the chip from environmental factors. The lithium battery protection chip 20 can be a chip integrating multiple circuits. For example, it can provide overcharge and over-discharge protection for the lithium battery by designing overcharge detection circuits and over-discharge detection circuits, as well as implementing other protection functions. Specifically, corresponding detection circuits can be integrated on the lithium battery protection chip 20 according to actual conditions and user needs to achieve lithium battery protection. The drive pins of the lithium battery protection chip 20 can be connected to an external driving device through the input pins 30 on the encapsulation body 10, and the output pins of the lithium battery protection chip 20 are connected to the lithium battery through the protection pins 40 on the encapsulation body 10. Thus, the lithium battery protection chip 20 can be driven by an external driving device to protect the lithium battery. The input pins 30 can include two pins, a positive terminal and a negative terminal, for connection to the external driving device. The positions of the input pins 30 and protection pins 40 on the plastic package 10 can be set according to the actual location of the external drive device and lithium battery. The width and size of the pins can also be adjusted to adapt to the external drive device and lithium battery.

[0047] It should be noted that the lithium battery protection package in this embodiment does not require a circuit board. The specific design follows the original circuit board's structural dimensions, with external metal pins placed at the original nickel solder joints. The positive and negative terminals of the lithium battery are then bonded to the corresponding pins of the lithium battery protection chip 20 according to the original process. The exposed metal pins at the bottom of the lithium battery protection chip 20, along with the side pins, form the protection pins 40. Thus, this lithium battery protection package can also support the spot welding output method of the original circuit board. This embodiment eliminates the need for a circuit board compared to the original processing steps, simplifying the production process, saving costs, conserving space in the lithium battery protection package, and reducing its weight.

[0048] This utility model's technical solution comprises a lithium battery protection package consisting of a molding compound 10, a lithium battery protection chip 20, an input pin 30, and a protection pin 40. The molding compound 10 forms a cavity. The lithium battery protection chip 20, used for overcharge and over-discharge protection of the lithium battery, is housed within the molding compound 10. The lithium battery protection chip 20 has a drive pin and an output pin. The input pin 30 is disposed on the molding compound 10, with one end connected to the drive pin of the lithium battery protection chip 20 and the other end connected to an external drive device. The protection pin 40 is disposed on the molding compound 10, with one end connected to the output pin of the lithium battery protection chip 20 and the other end connected to the lithium battery. Thus, the lithium battery protection package of this utility model can directly encapsulate the lithium battery protection chip 20 through the molding compound 10, eliminating the need to place the lithium battery protection chip 20 on a circuit board, thereby reducing the structural weight of the lithium battery protection package and minimizing its space occupation.

[0049] In another embodiment, the lithium battery protection chip 20, in addition to overcharge and over-discharge protection, can also provide overcurrent and short-circuit protection. When the lithium battery is charging, the battery voltage gradually increases. When the battery voltage reaches the overcharge protection voltage threshold set by the lithium battery protection chip 20, the lithium battery protection chip 20 will trigger the overcharge protection function. The overcharge protection process is as follows: The overcharge detection circuit inside the lithium battery protection chip 20 monitors the battery voltage in real time. When the voltage exceeds the threshold, the lithium battery protection chip 20 outputs a control signal to turn off the switching transistor (usually a MOSFET) in the charging circuit, thereby cutting off the charging current and stopping the charging of the battery, preventing dangerous situations such as overheating, bulging, or even explosion caused by overcharging. For example, the lithium battery overcharge protection voltage threshold is generally set between 4.2V and 4.35V. Taking a lithium battery with a rated voltage of 3.7V as an example, when the battery voltage rises to 4.25V during charging (assuming the overcharge protection voltage set by the protection chip is 4.25V), the lithium battery protection chip 20 will activate and cut off the charging circuit.

[0050] Over-discharge protection is crucial because the voltage of a lithium battery gradually decreases during discharge. Excessive discharge can lead to decreased battery performance, shortened lifespan, and even permanent damage. When the battery voltage drops to the over-discharge protection voltage threshold set by the lithium battery protection chip 20, the chip activates over-discharge protection. The over-discharge detection circuit of the lithium battery protection chip 20 continuously monitors the battery voltage. When the voltage falls below the threshold, the chip outputs a control signal to turn off the switching transistor in the discharge circuit, cutting off the discharge current and preventing further battery discharge. For example, the over-discharge protection voltage threshold for a typical lithium battery is set between 2.5V and 2.75V. Using a lithium battery with a rated voltage of 3.7V as an example, when the battery discharges to 2.6V (assuming the over-discharge protection voltage set by the protection chip is 2.6V), the lithium battery protection chip 20 will cut off the discharge circuit, stopping the battery discharge.

[0051] Overcurrent protection is used when the discharge current of a lithium battery is too high, generating excessive heat that may damage the battery and related circuits, or even cause a safety accident. The lithium battery protection chip 20 detects the current in the discharge circuit and triggers overcurrent protection when the current exceeds a set overcurrent protection threshold. The process is as follows: The current detection circuit inside the lithium battery protection chip 20 monitors the discharge current in real time. When the current exceeds the threshold, the lithium battery protection chip 20 quickly outputs a control signal to turn off the switching transistor in the discharge circuit, limiting the current. For example, different types and specifications of lithium batteries have different overcurrent protection thresholds; for instance, the overcurrent protection threshold for some small lithium batteries may be set between 1A and 3A. If the normal operating current of the battery is 0.5A, and the discharge current suddenly increases to 2A (assuming the overcurrent protection threshold is 2A) due to some reason (such as a load short circuit), the lithium battery protection chip 20 will immediately activate and cut off the discharge circuit.

[0052] Short-circuit protection addresses an extreme overcurrent situation. When the positive and negative terminals of a battery are directly short-circuited, an extremely large short-circuit current is generated, instantly releasing a large amount of energy, potentially causing serious safety problems such as fires and explosions. The lithium battery protection chip 20 has the ability to quickly detect short circuits and will immediately take protective measures once a short circuit is detected. The process: The lithium battery protection chip 20 determines whether a short circuit has occurred by monitoring changes in the battery's voltage and current. When a short circuit is detected, the lithium battery protection chip 20 will turn off the switching transistor in the discharge circuit within a very short time (usually a few microseconds to tens of microseconds), cutting off the short-circuit current and preventing danger. For example, in practical applications, if the output terminal of a lithium battery is accidentally short-circuited by a metal object, the lithium battery protection chip 20 will instantly detect the sharp increase in short-circuit current and quickly cut off the circuit, protecting the battery and equipment.

[0053] Reference Figure 2 In one embodiment, the molding compound 10 includes:

[0054] Housing 11, wherein the housing 11 is formed with a receiving cavity;

[0055] A sealing structure 12 is disposed at the joint of the housing 11, and the sealing structure 12 is used to isolate the accommodating cavity space of the housing 11 from the external environment.

[0056] In this embodiment, the housing 11 can be used to fix the position of the lithium battery protection chip 20, ensuring the safety and stability inside the cavity formed by the housing 11 of the lithium battery protection package. When the lithium battery protection package is working, the position of the lithium battery protection chip 20 will not change, and external gases or objects cannot fall onto the lithium battery protection chip 20, affecting the operation of the protection circuit on the lithium battery protection chip 20. The sealing structure 12 can be an epoxy resin layer, a laser welding layer, or an ultrasonic welding structure, which can be specifically set according to the actual situation and user needs. The sealing structure 12 can provide moisture and water protection, dust protection, chemical corrosion protection, leakage prevention, and reduction of electromagnetic interference.

[0057] Reference Figure 2 In one embodiment, the housing 11 has a pin lead-out hole 50, and a sealing structure 12 is provided at the pin lead-out hole 50; one end of the input pin 30 is connected to the drive pin of the lithium battery protection chip 20 through the pin lead-out hole 50, and one end of the protection pin 40 is connected to the output pin of the lithium battery protection chip 20 through the pin lead-out hole 50.

[0058] In this embodiment, a sealing structure 12 is provided at the pin lead-out hole 50, which can serve to prevent water and dust. The pin lead-out hole 50 facilitates the connection between the input pin 30 and the drive pin of the lithium battery protection chip 20, as well as the connection between the protection pin 40 and the output pin of the lithium battery protection chip 20. The position and opening size of the pin lead-out hole 50 can be set to correspond to the drive pin and output pin of the lithium battery protection chip 20.

[0059] Reference Figure 2 In one embodiment, the protection pin 40 includes:

[0060] The first pin 41 has one end connected to the output pin of the lithium battery protection chip 20, and the other end of the first pin 41 is used to connect to the positive terminal of the lithium battery.

[0061] The second pin 42 has one end connected to the output pin of the lithium battery protection chip 20, and the other end connected to the negative terminal of the lithium battery.

[0062] In this embodiment, the protection pin 40 is composed of a first pin 41 and a second pin 42. The first pin 41 is connected to the positive terminal of the lithium battery, and the second pin 42 is connected to the negative terminal of the lithium battery. Thus, three pins are provided on the encapsulation 10: an input pin 30, a first pin 41, and a second pin 42. The length and width of the input pin 30, the first pin 41, and the second pin 42 can be set according to the actual situation of the external driving device and the lithium battery.

[0063] Reference Figure 3 In one embodiment, the lithium battery protection package further includes:

[0064] An anti-reverse circuit 60 is disposed within the plastic encapsulation 10. The input terminal of the anti-reverse circuit 60 is used to connect to a power supply, and the output terminal of the anti-reverse circuit 60 is connected to the input terminal of the lithium battery protection chip 20. The anti-reverse circuit 60 is used to provide reverse connection protection for the lithium battery protection chip 20.

[0065] In this embodiment, the reverse connection protection circuit 60 can be composed of multiple switching transistors to provide reverse connection protection for the lithium battery protection chip 20; further, referring to... Figure 5 In this embodiment, the anti-reverse circuit 60 includes a first PMOS transistor P1 and a first electrostatic discharge diode ESD. The gate of the first PMOS transistor P1 is grounded, the source of the first PMOS transistor P1 and the first terminal of the first electrostatic discharge diode ESD are connected to the input terminal of the lithium battery protection chip 20, the drain of the first PMOS transistor P1 is used to connect to the power supply, and the second and third terminals of the first electrostatic discharge diode ESD are grounded.

[0066] In this embodiment, when the power supply is normally connected to the circuit, the first PMOS transistor P1 is normally turned on, supplying power to the lithium battery protection chip 20 through the source of the first PMOS transistor P1. If the power supply is reversed, the source and drain of the first PMOS transistor P1 are at negative voltage, and the gate is at positive voltage. At this time, the first PMOS transistor P1 is not turned on, thus achieving the reverse protection function. Compared with the previous method of using external components, where a resistor is connected in series at the chip power supply terminal, if a reverse connection occurs, the lithium battery protection chip 20 will conduct abnormally, and the resistor is used to limit the current, preventing damage to the lithium battery protection chip 20. It can be seen that the reverse protection design of this application can effectively protect the lithium battery protection chip 20 from damage without external components. The reverse protection circuit 60 not only provides reverse connection protection, eliminating the need for external components, but also provides a low internal resistance conduction path when the connection is correct. This allows the lithium battery to be used as a large capacitor, solving the problem of increased size after the lithium battery protection package incorporates a large capacitor. The first electrostatic discharge diode ESD can be used to prevent electrostatic interference. Furthermore, the anti-reverse circuit 60 can be integrated with the lithium battery protection chip 20 into a single chip, and then packaged in a plastic package. For details, please refer to... Figure 3The anti-reverse circuit 60 and the lithium battery protection chip 20 are within the dashed box, indicating that they are integrated into one chip; alternatively, the anti-reverse circuit 60 and the lithium battery protection chip 20 can be integrated into two separate chips and electrically connected by means of metal wires or soldering.

[0067] In one embodiment, the encapsulant 10 is an epoxy resin encapsulant.

[0068] In this embodiment, the molding compound 10 can be made of epoxy resin. Epoxy resin has excellent insulation properties, effectively preventing electrical interference between the chip and the external environment, ensuring the chip operates normally and stably. It also possesses high mechanical strength, providing reliable physical protection for the internal chip and other components, resisting certain external impacts and vibrations. Furthermore, epoxy resin has good chemical stability and strong resistance to chemical corrosion, protecting the chip from external chemical corrosion. Additionally, the molding compound 10 may include additives such as fillers, flame retardants, and release agents. Common fillers include silicon dioxide (SiO2) powder. Fillers can reduce the coefficient of thermal expansion of the molding compound material, matching it with the coefficients of thermal expansion of the chip and substrate, reducing stress caused by differences in thermal expansion during temperature changes, thereby improving the reliability of the package. Simultaneously, fillers can also improve the hardness and wear resistance of the molding compound 10. To meet safety standards, the molding compound 10 needs to possess certain flame-retardant properties; commonly used flame retardants include brominated flame retardants and phosphorus-based flame retardants. These flame retardants can inhibit combustion when exposed to an ignition source, preventing the spread of fire and improving product safety. During the manufacturing process of the molded body 10, it is necessary to smoothly remove the molded body 10 from the mold. The release agent can reduce the friction between the molding material and the mold, making the demolding process smoother, improving production efficiency, and preventing damage to the surface of the molded body 10.

[0069] Reference Figure 4 In one embodiment, a buffer layer 70 is provided in the cavity of the encapsulation body 10, and the buffer layer 70 covers the surface of the lithium battery protection chip 20.

[0070] In this embodiment, the buffer layer 70 can be made of silicone or foam material. The buffer layer 70 effectively absorbs external impacts and vibrations, reducing direct impact on the internal chips and thus lowering the risk of damage. The buffer layer 70 also serves as an insulating material, preventing direct contact between internal chips and reducing wear and damage caused by friction. Furthermore, the buffer layer 70 helps secure the internal chips, preventing them from moving within the encapsulation 10 and ensuring the stability of the item during transportation and use. Some buffer materials also possess thermal insulation properties, which can regulate temperature changes to a certain extent and protect the internal items from extreme temperatures.

[0071] This utility model also proposes a power supply device.

[0072] In one embodiment, the power supply device includes a lithium battery pack and a lithium battery protection package as described above, wherein the lithium battery pack is connected to a protection pin 40 in the lithium battery protection package. It is understood that since the power supply device of this utility model uses the aforementioned lithium battery protection package, the embodiments of the power supply device of this utility model include all the technical solutions of all embodiments of the aforementioned lithium battery protection package, and the achieved technical effects are completely the same, and will not be repeated here.

[0073] This utility model also proposes an electronic wearable device.

[0074] In one embodiment, the wearable electronic device includes the power supply device as described above. It is understood that since the wearable electronic device of this invention uses the aforementioned power supply device, the embodiments of the wearable electronic device of this invention include all the technical solutions of all embodiments of the aforementioned power supply device, and the achieved technical effects are completely identical, and will not be repeated here.

[0075] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A lithium battery protection package for charging and discharging protection of lithium batteries, characterized in that, include: A molding compound having a receiving cavity; A lithium battery protection chip for overcharge and over-discharge protection of lithium batteries is housed in the plastic package. The lithium battery protection chip has drive pins and output pins. An input pin is disposed on the plastic package. One end of the input pin is connected to the drive pin of the lithium battery protection chip, and the other end of the input pin is used to connect to an external drive device. A protection pin is disposed on the plastic package. One end of the protection pin is connected to the output pin of the lithium battery protection chip, and the other end of the protection pin is used to connect to the lithium battery.

2. The lithium battery protection package as described in claim 1, characterized in that, The encapsulation includes: A housing having a receiving cavity; A sealing structure is provided at the joint of the housing, and the sealing structure is used to isolate the accommodating cavity space of the housing from the external environment.

3. The lithium battery protection package as described in claim 2, characterized in that, The housing has a pin lead-out hole, and a sealing structure is provided at the pin lead-out hole; one end of the input pin is connected to the drive pin of the lithium battery protection chip through the pin lead-out hole, and one end of the protection pin is connected to the output pin of the lithium battery protection chip through the pin lead-out hole.

4. The lithium battery protection package as described in claim 1, characterized in that, The protection pin includes: The first pin has one end connected to the output pin of the lithium battery protection chip, and the other end is used to connect to the positive terminal of the lithium battery. The second pin has one end connected to the output pin of the lithium battery protection chip, and the other end connected to the negative terminal of the lithium battery.

5. The lithium battery protection package as described in claim 1, characterized in that, The lithium battery protection package also includes: An anti-reverse circuit is disposed within the plastic package. The input terminal of the anti-reverse circuit is used to connect to a power supply, and the output terminal of the anti-reverse circuit is connected to the input terminal of the lithium battery protection chip. The anti-reverse circuit is used to provide reverse connection protection for the lithium battery protection chip.

6. The lithium battery protection package as described in claim 5, characterized in that, The anti-reverse circuit includes a first PMOS transistor and a first electrostatic discharge diode. The gate of the first PMOS transistor is grounded, the source of the first PMOS transistor and the first terminal of the first electrostatic discharge diode are connected to the input terminal of the lithium battery protection chip, the drain of the first PMOS transistor is used to connect to the power supply, and the second and third terminals of the first electrostatic discharge diode are grounded.

7. The lithium battery protection package as described in claim 1, characterized in that, The encapsulation body is an epoxy resin encapsulation body.

8. The lithium battery protection package as described in claim 1, characterized in that, A buffer layer is provided inside the cavity of the encapsulation, and the buffer layer covers the surface of the lithium battery protection chip.

9. A power supply device, characterized in that, It includes a lithium battery pack and a lithium battery protection package as described in any one of claims 1-8, wherein the lithium battery pack is connected to a protection pin in the lithium battery protection package.

10. An electronic wearable device, characterized in that, Includes the power supply device as described in claim 9.

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