Plastic shell battery pack and inspection and repair method thereof

Abstract

The present invention belongs to the field of plastic shell battery packs, specifically a plastic shell battery pack, comprising a front shell body; a rear shell body is arranged behind the front shell body, and an easy-to-maintain assembly mechanism is arranged between the front shell body and the rear shell body; the easy-to-maintain assembly mechanism includes a charging and discharging socket, and the charging and discharging socket is arranged at a position between the front shell body and the rear shell body; through the design of the easy-to-maintain assembly mechanism, the function of facilitating the maintenance of the plastic shell battery pack is achieved, and the problem of the existing plastic shell battery pack having an abnormal situation during use after the upper and lower shells are ultrasonically connected, IPX4 is completed, and it is fully sealed, or fixed by bolts, is solved. Since the physical contact interface is blocked after sealing, the abnormal state cannot be warned, and there is no wake-up power supply interface after low power and over-discharge protection, thereby improving the protection of the device.

Description

Technical Field

[0001] The present invention relates to the field of plastic shell battery packs, in particular to a plastic shell battery pack and a method for inspecting and repairing the same. Background Art

[0002] A plastic-cased battery pack is a rechargeable or disposable battery module encapsulated in high-toughness engineering plastics, combining safety with a lightweight design. Its casing has excellent insulation, impact resistance, and corrosion resistance, effectively protecting the internal battery cells from mechanical damage, moisture, and short-circuit risks.

[0003] The existing plastic shell battery pack can specifically refer to the application number: CN202221543419.8, which is a secondary lithium battery pack waterproof structure, including a battery pack, a No. 1 side shell is provided on one side of the battery pack, and a No. 2 side shell is provided on the other side of the battery pack. By selecting suitable waterproof and dustproof materials, calculating and designing the most reasonable waterproof structural dimensions, and designing a style of integrated molding of the plastic shell and the soft glue, processing is more convenient, assembly tolerance is smaller, waterproof function is better, and the waterproof and dustproof function and safety of the lithium battery pack are better guaranteed; in order to be able to cope with increasingly fierce competition, the plastic shell and soft glue two-color molding waterproof design is used as a template for the later development of secondary lithium battery packs to shorten the development cycle; in order to meet customer needs and lead market trends, the lithium battery pack is miniaturized, lightweight, and large-capacity, and better waterproof effect is achieved through the plastic shell and soft glue two-color molding;

[0004] Existing plastic shell battery packs achieve IPX4 certification after the upper and lower shells are ultrasonically sealed, or are fixed with bolts. However, abnormal conditions may occur during use of the battery pack. Since the physical contact interface is blocked after sealing, abnormal conditions cannot be warned. At the same time, there is no wake-up power supply interface after low battery and over-discharge protection. Therefore, a plastic shell battery pack and its inspection and repair method are proposed to address the above problems. Summary of the Invention

[0005] In order to make up for the shortcomings of the existing technology, the existing plastic shell battery pack has completed IPX4 after the upper and lower shells are ultrasonically tested, and after being fully sealed or fixed with bolts, abnormal conditions may occur in the battery pack during use. Since the physical contact interface is blocked after sealing, the abnormal state cannot be warned. At the same time, there is a lack of a wake-up power supply interface after low power and over-discharge protection. The present invention proposes a plastic shell battery pack and its inspection and repair method.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the plastic shell battery pack of the present invention comprises a front shell body; a rear shell body is arranged behind the front shell body, and a maintenance-friendly assembly mechanism is arranged between the front shell body and the rear shell body;

[0007] The assembly mechanism that is easy to maintain includes a charging and discharging socket, which is arranged between the front shell body and the rear shell body. A first slot is provided at the upper position near the rear end of the front shell body, and a second slot is provided at the upper position near the front end of the rear shell body. The first slot and the second slot are also sleeved on the outside of the charging and discharging socket, and the first slot and the second slot are also slidably connected to the charging and discharging socket.

[0008] Preferably, a first groove is provided at the top of the front shell body, the top of the first groove is fixedly connected to the bottom end of the bottom membrane, the top of the bottom membrane is adhered to the bottom end of the top membrane, the bottom membrane is designed for a thick silicone self-healing membrane material, and the top membrane is designed for a waterproof and breathable membrane material, specifically a 3M 468MP waterproof and breathable membrane (IP69K grade).

[0009] Preferably, a second groove is provided at the top of the front shell body near the right side of the first groove, the second groove is arc-shaped, and two groups of positioning grooves are provided at the top of the bottom film.

[0010] Preferably, two groups of detection holes are opened at the top of the first groove, and the interior of the detection holes adopts a 30° conical expansion design.

[0011] Preferably, the bottom end of the charging and discharging socket is fixedly connected to the top end of the fixed limiting plate, and two sets of welding pad positions are provided on the top end of the fixed limiting plate. The outside of the fixed limiting plate is also sleeved with the inside of the front shell body and the rear shell body, and the fixed limiting plate is also slidably connected to the front shell body and the rear shell body.

[0012] Preferably, the outer side of the charging and discharging socket is fixedly connected to the inner wall of the first fixed block near the lower position, the rear end of the front shell body is provided with a first slot, the front end of the first fixed block is inserted into the first slot, and the first fixed block is slidably connected to the first slot.

[0013] Preferably, a second slot is provided at the front end of the rear shell body, a rear end of the first fixing block is inserted into the second slot, and the first fixing block is slidably connected to the second slot.

[0014] Preferably, the outer side of the charging and discharging socket is fixedly connected to the inner wall of the second fixed block near the position above the fixed limit plate, the top of the second fixed block is fixedly connected to the bottom end of the sealing block, and the top of the sealing block is also in contact with the top of the inner part of the front shell body and the rear shell body.

[0015] Preferably, the rear end of the front shell body is fixedly connected to the front end of the ultrasonic line, the front end of the rear shell body is provided with an ultrasonic groove, the ultrasonic line is inserted inside the ultrasonic groove, and the ultrasonic line is slidably connected to the ultrasonic groove, and the left and right ends of the outer sides of the front shell body and the rear shell body are also provided with anti-slip grooves, and the anti-slip grooves are arc-shaped.

[0016] Preferably, a method for inspecting and repairing a plastic shell battery pack is provided, wherein during inspection, the thumb is pressed on the second groove to tear off the top film, and a probe is guided through the positioning groove to insert into the inspection hole, directly reaching the pad position to inspect the circuit status; after the probe is pulled out, the bottom film heals itself, and the top film can be re-bonded to restore waterproofing;

[0017] During assembly, align the charging and discharging socket with the first slot and the second slot, insert the first fixing block into the first slot and the second slot, and embed the ultrasonic wire into the ultrasonic slot to complete the sealing and fixing;

[0018] When recharging, the front shell body and the rear shell body are separated by sliding to expose the charge and discharge sockets, and an external power supply is connected to wake up the low-battery state or recharge. Specifically, when the single battery module enters the protection state due to over-discharge, a small current of 0.1C is input through the charge and discharge socket to wake up the single battery module and restore the charging capacity;

[0019] The charging is specifically performed in a constant current charging mode, wherein the constant current value range is specifically 0.5C to 1.0C, and specifically includes the following steps:

[0020] S1: disconnecting from an external power source when a voltage in the plurality of single battery modules reaches a first reference voltage, and stopping the external power source from supplying current to the single battery modules. The first reference voltage is 4.15V.

[0021] S2: performing multiple discharge processes on the multiple single battery modules, wherein the discharge current of each discharge process is different, and the multiple discharge currents used in the multiple discharge processes are current values that decrease step by step;

[0022] S3: When the plurality of single battery modules reach the second reference voltage, the discharge is stopped, and the charging is completed. The second reference voltage is 3.85V.

[0023] The present invention is beneficial in that:

[0024] 1. This invention facilitates the maintenance of plastic-cased battery packs through a structural design that facilitates the inspection and assembly of the assembly mechanism. This solves the problem of existing plastic-cased battery packs that, after ultrasonically sealing the upper and lower shells to achieve IPX4 certification and fully sealing, or securing with bolts, may experience abnormalities during use. Because the physical contact interface is blocked after sealing, abnormal conditions cannot be warned, and there is also a lack of a wake-up power supply interface after low-battery and over-discharge protection. This improves device protection.

[0025] 2. The present invention realizes the function of non-destructive maintenance through the structural design of the assembly mechanism that is convenient for maintenance. It can break through the physical limitations of irreversible closure after ultrasonic welding and realize non-destructive contact detection. It improves the maintenance efficiency while maintaining the original protection level, which is beneficial to extending the overall service life of the battery pack and can effectively maintain the structural strength of the battery pack throughout its life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of a first partial front view cross-sectional three-dimensional structure of the present invention;

[0029] Figure 3 It is a schematic diagram of a second partial front view cross-sectional three-dimensional structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the maintenance component of the present invention;

[0031] Figure 5 For the present invention Figure 1 A schematic diagram of the structure enlarged in the middle;

[0032] Figure 6 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0033] Figure 7 For the present invention Figure 3 The enlarged structural diagram at C in the middle;

[0034] Figure 8 For the present invention Figure 4 The enlarged structural diagram at D in the middle;

[0035] Figure 9 For the present invention Figure 4 Schematic diagram of the structure enlarged at E in the middle.

[0036] In the figure: 1. Front shell body; 2. Rear shell body; 10. Charging and discharging socket; 11. First slot; 12. Second slot; 13. First fixing block; 14. First slot; 15. Second slot; 16. Fixed limit plate; 17. Second fixing block; 18. Sealing block; 19. Ultrasonic groove; 20. Ultrasonic line; 21. First groove; 22. Bottom film; 23. Top film; 24. Second groove; 25. Detection hole; 26. Pad position; 27. Positioning groove; 28. Anti-slip groove. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figures 1-9 As shown, a plastic shell battery pack includes a front shell body 1; a rear shell body 2 is provided behind the front shell body 1, and an assembly mechanism for facilitating maintenance is provided between the front shell body 1 and the rear shell body 2;

[0039] The assembly mechanism for easy maintenance includes a charging and discharging socket 10, which is arranged between the front shell body 1 and the rear shell body 2. A first slot 11 is provided at the upper position near the rear end of the front shell body 1, and a second slot 12 is provided at the upper position near the front end of the rear shell body 2. The first slot 11 and the second slot 12 are also sleeved on the outside of the charging and discharging socket 10, and the first slot 11 and the second slot 12 are also slidably connected to the charging and discharging socket 10. The charging and discharging socket 10 is square in design.

[0040] During operation, the outer side of the charging and discharging socket 10 near the top is inserted into the first slot 11 opened at the rear end of the front shell body 1, and then the second slot 12 opened at the front end of the rear shell body 2 is aligned with the position of the front shell body 1 and inserted until the second slot 12 opened at the front end of the second slot 12 completely covers the outer side of the charging and discharging socket 10.

[0041] Furthermore, a first groove 21 is formed at the top of the front shell body 1. The top of the first groove 21 is fixedly connected to the bottom of the bottom membrane 22. The top of the bottom membrane 22 is adhered to the bottom of the top membrane 23. The bottom membrane 22 is made of a thick silicone self-repairing membrane material, and the top membrane 23 is made of a waterproof and breathable membrane material.

[0042] During operation, the top film 23 is pinched and torn outward until the top film 23 is torn off along the surface of the bottom film 22. Due to the design of the material of the bottom film 22, the second groove will automatically heal within 24 hours after puncture. At the same time, due to the design of the material of the top film 23, it has good air permeability.

[0043] Furthermore, a second groove 24 is provided at the top of the front shell body 1 near the right side of the first groove 21. The second groove 24 is arc-shaped. Two sets of positioning grooves 27 are provided at the top of the bottom membrane 22. The size of the second groove 24 is similar to that of an adult's thumb.

[0044] During operation, the thumb moves along the second groove 24 toward the side of the top film 23 until it touches the side of the top film 23 inside the first groove 21 , and the positioning groove 27 provided on the bottom film 22 is used for positioning, so as to facilitate the insertion of the probe.

[0045] Furthermore, two groups of detection holes 25 are opened at the top of the first groove 21, and the interior of the detection holes 25 adopts a 30° conical expansion design;

[0046] During operation, the probe is inserted into the positioning groove 27 according to the positioning groove 27 opened on the bottom membrane 22 as a position guide until it passes through the bottom membrane 22 and reaches the inside of the detection hole 25. The inside of the detection hole 25 adopts a 30° conical expansion design so that it can be used for contact with probes of different diameters.

[0047] Furthermore, the bottom end of the charging and discharging socket 10 is fixedly connected to the top of the fixed limiting plate 16. The top of the fixed limiting plate 16 is provided with two sets of welding pads 26. The outside of the fixed limiting plate 16 is also sleeved with the interior of the front shell body 1 and the rear shell body 2, and the fixed limiting plate 16 is also slidably connected to the front shell body 1 and the rear shell body 2.

[0048] During operation, the probe continues to move deeper inward until it reaches the pad position 26 opened by the fixed limit plate 16 for detection. When the front shell body 1 and the rear shell body 2 completely wrap the outside of the charging and discharging socket 10, the inner walls of the front shell body 1 and the rear shell body 2 will wrap the outside of the fixed limit plate 16.

[0049] Furthermore, the outer side of the charging and discharging socket 10 is fixedly connected to the inner wall of the first fixing block 13 near the lower position. A first slot 14 is opened at the rear end of the front shell body 1. The front end of the first fixing block 13 is inserted into the first slot 14, and the first fixing block 13 is slidably connected to the first slot 14. The first fixing block 13 is circular in design.

[0050] During operation, the charging and discharging socket 10 is inserted into the front shell body 1 , which will drive the front end of the first fixing block 13 to be inserted along the inner wall of the first slot 14 until it is inserted into the first slot 14 .

[0051] Furthermore, a second slot 15 is provided at the front end of the rear shell body 2, the rear end of the first fixing block 13 is inserted into the second slot 15, and the first fixing block 13 is slidably connected to the second slot 15, and the second slot 15 is semicircular in design;

[0052] During operation, the rear shell body 2 is inserted, driving the second slot 15 to be inserted along the rear end outside of the first fixing block 13 until it is completely covered on the outside of the first fixing block 13 .

[0053] Furthermore, the outer side of the charging and discharging socket 10 is fixedly connected to the inner wall of the second fixing block 17 near the upper position of the fixed limit plate 16. The top of the second fixing block 17 is fixedly connected to the bottom end of the sealing block 18. The top of the sealing block 18 is also in contact with the top of the inner part of the front shell body 1 and the rear shell body 2. The sealing block 18 is made of rubber.

[0054] During operation, the front shell body 1 and the rear shell body 2 are wrapped around the outside of the charging and discharging socket 10, and the sealing block 18 at the top of the second fixing block 17 will simultaneously press against the inner tops of the front shell body 1 and the rear shell body 2, thereby increasing the sealing performance.

[0055] Furthermore, the rear end of the front shell body 1 is fixedly connected to the front end of the ultrasonic line 20, and the front end of the rear shell body 2 is provided with an ultrasonic groove 19, the ultrasonic line 20 is inserted inside the ultrasonic groove 19, and the ultrasonic line 20 is slidably connected to the ultrasonic groove 19;

[0056] During operation, the rear shell body 2 is inserted into the front shell body 1 , driving the ultrasonic line 20 to be inserted along the inside of the ultrasonic groove 19 until the ultrasonic line 20 is completely inserted into the inside of the ultrasonic groove 19 .

[0057] Furthermore, the left and right ends of the outer sides of the front shell body 1 and the rear shell body 2 are also provided with anti-slip grooves 28, and the anti-slip grooves 28 are arc-shaped;

[0058] During operation, the anti-skid grooves 28 provided on the outer sides of the front shell body 1 and the rear shell body 2 can effectively activate the anti-skid effect.

[0059] Furthermore, a method for inspecting and repairing a plastic-cased battery pack is provided. During inspection, the thumb presses the second groove 24 to tear open the top film 23. The probe is guided through the positioning groove 27 and inserted into the inspection hole 25 to directly reach the solder pad position 26 to inspect the circuit status. After the probe is pulled out, the bottom film 22 heals itself, and the top film 23 can be re-bonded to restore waterproofing.

[0060] During assembly, align the charging and discharging socket 10 with the first slot 11 and the second slot 12, insert the first fixing block 13 into the first slot 14 and the second slot 15, and embed the ultrasonic wire 20 into the ultrasonic slot 19 to complete the sealing and fixing;

[0061] When recharging, the front shell body 1 and the rear shell body 2 are separated by sliding to expose the charge and discharge socket 10, and an external power supply is connected to wake up the battery from low power or recharge. Specifically, when the single battery module enters the protection state due to over-discharge, a small current of 0.1C is input through the charge and discharge socket to wake up the single battery module and restore the charging capacity;

[0062] The charging is specifically performed in a constant current charging mode, wherein the constant current value range is specifically 0.5C to 1.0C, and specifically includes the following steps:

[0063] S1: disconnecting from an external power source when a voltage in the plurality of single battery modules reaches a first reference voltage, and stopping the external power source from supplying current to the single battery modules. The first reference voltage is 4.15V.

[0064] S2: performing multiple discharge processes on the multiple single battery modules, wherein the discharge current of each discharge process is different, and the multiple discharge currents used in the multiple discharge processes are current values that decrease step by step;

[0065] S3: When the plurality of single battery modules reach the second reference voltage, the discharge is stopped, and the charging is completed. The second reference voltage is 3.85V.

[0066] Working principle: When testing is required, move the thumb along the second groove 24 toward the side end of the top film 23 until it touches the side end of the top film 23 inside the first groove 21, pinch the top film 23 and tear it outward until the top film 23 is torn off along the surface of the bottom film 22, and then insert the probe along the inside of the positioning groove 27 according to the positioning groove 27 opened on the bottom film 22 as a position guide until it passes through the bottom film 22 and reaches the inside of the detection hole 25. The inside of the detection hole 25 adopts a 30° conical expansion design so that it can be used for probes of different diameters, and continue to go deeper inward until it reaches the pad position 26 opened on the fixed limit plate 16 for testing. When the probe is pulled out of the bottom film 22, the bottom film 22 will automatically heal within 24 hours after puncture due to its own material design.

[0067] During assembly, first insert the outer side of the charge and discharge socket 10 near the top into the first slot 11 opened at the rear end of the front shell body 1, and then align the second slot 12 opened at the front end of the rear shell body 2 with the position of the front shell body 1 and insert it until the second slot 12 opened at the front end of the second slot 12 completely wraps the outer side of the charge and discharge socket 10, and when the front shell body 1 and the rear shell body 2 completely wrap the outer side of the charge and discharge socket 10, the inner walls of the front shell body 1 and the rear shell body 2 will wrap the outer side of the fixed limit plate 16, and at the same time, when the charge and discharge socket 10 is inserted into the interior of the front shell body 1, it will drive the front end of the first fixing block 13 to be inserted along the inner wall of the first slot 14 until it is inserted into the first Inside the slot 14, when the rear shell body 2 is inserted, the second slot 15 is driven to be inserted along the outer side of the rear end of the first fixed block 13 until it is completely covered on the outside of the first fixed block 13, and at the same time, when the front shell body 1 and the rear shell body 2 are wrapped around the outside of the charging and discharging socket 10, the sealing block 18 at the top of the second fixed block 17 will simultaneously press against the top of the front shell body 1 and the rear shell body 2, thereby increasing the sealing. At the same time, when the rear shell body 2 is inserted into the front shell body 1, the ultrasonic line 20 is driven to be inserted along the inside of the ultrasonic groove 19 until the ultrasonic line 20 is completely inserted into the inside of the ultrasonic groove 19, and the anti-slip groove 28 opened on the outside of the front shell body 1 and the rear shell body 2 can effectively activate the anti-slip effect.

[0068] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A plastic shell battery pack, comprising a front shell body (1); characterized in that: A rear shell body (2) is provided behind the front shell body (1), and an assembly mechanism for facilitating maintenance is provided between the front shell body (1) and the rear shell body (2); The assembly mechanism convenient for maintenance comprises a charging and discharging socket (10), the charging and discharging socket (10) being arranged between the front shell body (1) and the rear shell body (2), a first slot (11) being provided at a position near the top of the rear end of the front shell body (1), and a second slot (12) being provided at a position near the top of the front end of the rear shell body (2), the first slot (11) and the second slot (12) both being slidably connected to the charging and discharging socket (10); The front shell body (1) has a first groove (21) at the top, a bottom membrane (22) is fixedly connected to the top of the first groove (21), and a top membrane (23) is fixedly connected to the top of the bottom membrane (22), the bottom membrane (22) is made of a thick silicone self-repairing membrane material, and the top membrane (23) is made of a waterproof and breathable membrane material; A second groove (24) is provided at the top of the front shell body (1) near the right side of the first groove (21), and the second groove (24) is arc-shaped. Two groups of positioning grooves (27) are provided at the top of the bottom membrane (22); Two groups of detection holes (25) are provided at the top of the first groove (21), and the interior of the detection holes (25) adopts a 30° conical expansion design; The bottom end of the charging and discharging socket (10) is fixedly connected to a fixed limiting plate (16), the top end of the fixed limiting plate (16) is provided with a welding pad position (26), and the outer side of the fixed limiting plate (16) is slidably connected to the front shell body (1) and the rear shell body (2); A first fixing block (13) is fixedly connected to the outer side of the charging and discharging socket (10) near a lower position, a first slot (14) is provided at the rear end of the front shell body (1), a front end of the first fixing block (13) is inserted into the first slot (14), and the first fixing block (13) is slidably connected to the first slot (14).

2. The plastic shell battery pack according to claim 1, characterized in that: A second slot (15) is provided at the front end of the rear shell body (2), a rear end of the first fixing block (13) is inserted into the second slot (15), and the first fixing block (13) is slidably connected to the second slot (15).

3. The plastic shell battery pack according to claim 2, characterized in that: A second fixed block (17) is fixedly connected to the outer side of the charging and discharging socket (10) at a position above the fixed limit plate (16); a sealing block (18) is fixedly connected to the top of the second fixed block (17); and the top of the sealing block (18) is in contact with the top of the interior of the front shell body (1) and the rear shell body (2).

4. The plastic shell battery pack according to claim 3, characterized in that: The rear end of the front shell body (1) is fixedly connected with an ultrasonic line (20), the front end of the rear shell body (2) is provided with an ultrasonic groove (19), the ultrasonic line (20) is inserted into the ultrasonic groove (19), and the ultrasonic line (20) is slidably connected to the ultrasonic groove (19), and the left and right ends of the outer sides of the front shell body (1) and the rear shell body (2) are both provided with anti-skid grooves (28), and the anti-skid grooves (28) are arc-shaped.

5. A method for inspecting and repairing a plastic-cased battery pack, applicable to a plastic-cased battery pack as claimed in claim 4, characterized in that: During maintenance, the thumb presses the second groove (24) to tear open the top film (23), and the probe is guided through the positioning groove (27) to be inserted into the detection hole (25) and directly reaches the pad position (26) to detect the circuit status; after the probe is pulled out, the bottom film (22) heals itself, and the top film (23) can be re-bonded to restore waterproofing; During assembly, the charging and discharging socket (10) is aligned with the first slot (11) and the second slot (12), the first fixing block (13) is inserted into the first slot (14) and the second slot (15), and the ultrasonic line (20) is embedded in the ultrasonic slot (19) to complete the sealing and fixing; When recharging, the front shell body (1) and the rear shell body (2) are separated by sliding to expose the charge and discharge socket (10), and an external power supply is connected to perform low-battery wake-up or recharging. Specifically, when the single battery module enters a protection state due to over-discharge, a small current of 0.1C is input through the charge and discharge socket to wake up the single battery module and restore the charging capability; The charging is specifically performed in a constant current charging mode, wherein the constant current value range is specifically 0.5C to 1.0C, and specifically includes the following steps: S1: When a voltage in the plurality of single battery modules reaches a first reference voltage, disconnecting from the external power supply and stopping the current supply from the external power supply to the single battery module. The first reference battery voltage is 4.15V. S2: performing multiple discharge processes on the multiple single battery modules, wherein the discharge current of each discharge process is different, and the multiple discharge currents used in the multiple discharge processes are current values that decrease step by step; S3: When the plurality of single battery modules reach the second reference voltage, the discharge is stopped, and the charging is completed. The second reference voltage is 3.85V.

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