Rechargeable lithium battery

Abstract

The utility model provides a kind of rechargeable lithium battery, including lithium cell and circuit board, the lithium cell is wrapped in label, forms outer layer protection to lithium cell, the top and bottom of the label are opened with electrode hole, top electrode hole is used to expose positive pole, bottom electrode hole is used to expose negative pole;The circuit board is fixedly connected in fixed support interior, the fixed support is supported on the battery cover cap top surface of lithium cell, the side of the circuit board is provided with charging port.The utility model, by being provided with the circuit board with 3.7V turns 1.5V voltage conversion function, 3.7V voltage output by lithium cell is stably converted into 1.5V voltage, widen the applicable scenario of battery;And, external charger can be connected with the charging port on the circuit board, by the charge management function of circuit board, lithium cell is safely charged, realize the function integration of voltage conversion and convenient charging, improve the practicality and use convenience of battery.

Description

Technical Field

[0001] This utility model relates to the field of rechargeable lithium battery technology, specifically a rechargeable lithium battery. Background Technology

[0002] Lithium batteries, as a high-efficiency energy storage component, are widely used in various small electronic devices such as remote controls, small electronic toys, and portable sensors due to their advantages such as high energy density and low self-discharge rate.

[0003] However, existing lithium batteries still have some drawbacks in practical applications: most lithium batteries have a nominal output voltage of 3.7V, while common devices such as remote controls and small electronic toys require 1.5V. The voltages are mismatched, and it is inconvenient to use if an external voltage conversion module is used. Furthermore, most lithium batteries do not have a charging function, and users need to replace the batteries frequently after use, which increases the cost of use and wastes resources. Utility Model Content

[0004] The purpose of this invention is to provide a rechargeable lithium battery to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rechargeable lithium battery, comprising:

[0007] A lithium battery cell is encased in a label to form an outer protective layer for the lithium battery cell. Electrode holes are provided at the top and bottom of the label, with the top electrode hole exposing the positive electrode and the bottom electrode hole exposing the negative electrode.

[0008] The circuit board is fixedly connected inside a mounting bracket, which supports the upper surface of the lithium battery cell's battery cap and is located in the top area inside the label. A charging port is provided on the side of the circuit board, through which an external charger can connect to the circuit board to charge the lithium battery. The circuit board has a 3.7V to 1.5V voltage conversion function, which can stably convert the 3.7V output voltage of the lithium battery cell to 1.5V voltage to adapt to the usage requirements of external devices that require 1.5V power supply.

[0009] Preferably, a positive electrode cap is fixedly connected to the top of the circuit board, and a crimping part is provided on the upper edge of the circuit board. The crimping part has a protruding or snap-fit ​​structure. The crimping part is connected to one end of the connecting nickel sheet. A first clearance groove is provided on the outer wall of the fixed bracket corresponding to the crimping part. The size of the first clearance groove is adapted to the thickness and width of the connecting nickel sheet, which can accommodate the connecting nickel sheet to pass smoothly and avoid the connecting nickel sheet being squeezed or rubbed against the outer wall of the fixed bracket during installation or use and thus being damaged. The other end of the connecting nickel sheet is fixedly connected to the battery cap. The connecting nickel sheet realizes the electrical connection between the circuit board and the lithium battery cell, providing a conductive channel for the lithium battery cell to transmit electrical energy to the circuit board and for the external charger to charge the lithium battery cell through the circuit board.

[0010] Preferably, a gasket I and a gasket II are provided on the top of the circuit board. Both gasket I and gasket II are circular ring structures. The center of each gasket I and gasket II has a through hole adapted to the positive terminal cap, allowing the positive terminal post to pass through the center to ensure the normal assembly and conductivity of the positive terminal post. When the gasket I and gasket II are pressed onto the circuit board, they are both inserted into the circular fixing bracket, and the upper end face of the gasket II is parallel to the end face of the fixing bracket. The gasket I has a second clearance groove at the position of the pressing part on the upper edge of the circuit board. The gasket I is pressed onto the top of the circuit board. The second clearance groove can expose the pressing part on the circuit board, avoiding the gasket I from blocking or interfering with the connection between the pressing part and the connecting nickel sheet. It can also accommodate and position the part of the connecting nickel sheet near the pressing part, further limiting the displacement of the connecting nickel sheet and ensuring the stability of the connection between the connecting nickel sheet and the pressing part and the battery cap.

[0011] Preferably, the gasket II has a mating part protruding outward from the edge on one side corresponding to the crimping part. The gasket II is pressed on top of the gasket I, forming a tight clamping and fixing on one end of the connecting nickel sheet on the crimping part and located in the second clearance groove, further enhancing the tightness of the connection between the connecting nickel sheet and the crimping part, and preventing the connecting nickel sheet from loosening during battery use. The mating part extends into the first clearance groove of the fixing bracket, and the positioning of the gasket II is achieved through the fitting and interlocking of the mating part and the first clearance groove.

[0012] Preferably, the circuit board is fixedly connected to two sides with outwardly protruding clamping plates, and the two side walls of the fixing bracket are provided with slots that are adapted to the shape and size of the clamping plates. When the circuit board is assembled into the fixing bracket, the clamping plates on both sides of the circuit board can be inserted into the slots on the side walls of the fixing bracket. Through the interlocking structure of the clamping plates and slots, the circuit board can be quickly positioned and firmly fixed in the fixing bracket.

[0013] Preferably, the bottom of the fixed bracket is fixedly provided with a positioning hole, and the lower end face of the circuit board is fixedly connected with a positioning post. When the clamping plates on both sides of the circuit board are engaged with the corresponding grooves on the side wall of the fixed bracket, the positioning post on the lower end face of the circuit board is inserted into the positioning hole at the bottom of the fixed bracket to form a double positioning structure. The charging port provided on the side of the circuit board faces the second square hole pre-opened on the fixed bracket.

[0014] Preferably, the top of the label has a first square hole corresponding to the position of the second square hole.

[0015] Preferably, the bottom circumference of the fixing bracket is evenly distributed with multiple legs, which are adapted to the docking groove opened on the top of the battery cap of the lithium battery cell. When the fixing bracket is supported on the upper surface of the battery cap, the legs at the bottom of the fixing bracket will be inserted into the docking groove on the top of the battery cap. Through the fitting and cooperation of the legs and the docking groove, the fixing bracket is positioned on the battery cap.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention, by setting up a circuit board with a 3.7V to 1.5V voltage conversion function, and in conjunction with the charging port integrated on the circuit board, stably converts the 3.7V voltage output by the lithium battery cell to 1.5V voltage, making it compatible with external devices that require 1.5V power supply, such as remote controls, small electronic toys, and portable sensors, thus broadening the battery's applicable scenarios. Furthermore, an external charger can pass through the first square hole of the label and the second square hole of the fixing bracket in sequence, and connect to the charging port on the circuit board. With the help of the circuit board's charging management function, the lithium battery cell can be safely charged, realizing the integration of voltage conversion and convenient charging functions, improving the battery's practicality and ease of use.

[0018] This utility model features a double positioning structure by setting card plates on both sides of the circuit board and positioning posts on the lower end face, corresponding to card slots on both sides of the fixed bracket and positioning holes on the bottom. The card plates are inserted into the card slots and the positioning posts are inserted into the positioning holes, thus limiting the displacement of the circuit board within the fixed bracket. This ensures that the charging port of the circuit board is aligned with the second square hole of the fixed bracket and the first square hole of the label, guaranteeing smooth connection of the external charger and achieving a stable connection between the charging port and the external charger.

[0019] This invention utilizes a pressing part on the upper edge of the circuit board to tightly fix one end of the connecting nickel sheet to the pressing part. Simultaneously, a first clearance groove is formed on the outer wall of the fixing bracket corresponding to the pressing part to accommodate the connecting nickel sheet, preventing damage from compression and friction during installation or use. This initially achieves limiting and protection of the connecting nickel sheet, ensuring its conductivity. Furthermore, a gasket I with a second clearance groove is provided in the connection area between the connecting nickel sheet and the pressing part. When gasket I is pressed onto the circuit board, it fully exposes the pressing part to avoid affecting the connection between the connecting nickel sheet and the pressing part, while also accommodating and positioning the portion of the connecting nickel sheet near the pressing part, limiting the displacement of the connecting nickel sheet. Finally, gasket II is pressed onto gasket I, with its mating part on the side corresponding to the pressing part extending into the first clearance groove of the fixing bracket for self-positioning. The main structure then presses and fixes one end of the connecting nickel sheet located in the second clearance groove, enhancing the stability of the connection between the connecting nickel sheet and the circuit board and ensuring the reliability of the electrical connection between the circuit board and the lithium battery cell. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of the lithium battery cell and fixing bracket of this utility model;

[0023] Figure 4 This is a three-dimensional schematic diagram of gasket I, gasket II, and connecting nickel sheet of this utility model mounted on a fixed bracket;

[0024] Figure 5 This is a three-dimensional schematic diagram of the fixing bracket and lithium battery cell of this utility model;

[0025] Figure 6 This is a three-dimensional schematic diagram of the fixed bracket and circuit board from an upward angle.

[0026] Figure 7 This is a three-dimensional schematic diagram of the installation of the fixed bracket and circuit board of this utility model.

[0027] In the diagram: 1. Label; 101. Electrode hole; 2. First square hole; 3. Lithium battery cell; 301. Battery cap; 302. Docking groove; 4. Fixing bracket; 401. Slot; 402. First clearance groove; 403. Second square hole; 404. Support leg; 405. Positioning hole; 5. Connecting nickel sheet; 6. Circuit board; 601. Crimping part; 602. Charging port; 603. Positive electrode cap; 604. Card plate; 605. Positioning post; 7. Gasket I; 701. Second clearance groove; 8. Gasket II; 801. Mating part. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example:

[0030] Please see Figures 1 to 7 This utility model provides a technical solution:

[0031] A rechargeable lithium battery includes a lithium battery cell 3 and a circuit board 6. The lithium battery cell 3 is entirely enclosed within a label 1. To enable the battery to connect to the positive and negative terminals of an external circuit, electrode holes 101 are correspondingly provided at the top and bottom of the label 1 (e.g., ...). Figure 1 As shown in the figure, the top electrode hole 101 is aligned with the positive electrode structure at the top of the lithium battery cell 3 to expose the positive electrode of the lithium battery; the bottom electrode hole 101 is adapted to the negative electrode at the bottom of the lithium battery cell 3 to expose the negative electrode, ensuring that the battery can stably establish an electrical connection with external devices during the discharge process.

[0032] It should be noted that label 1 is preferably made of insulating and wear-resistant polyvinyl chloride (PVC) material, which not only forms a comprehensive outer layer of protection for lithium battery cell 3, isolating it from external dust, moisture and minor impacts that could damage lithium battery cell 3, but also allows key parameters such as battery capacity, rated voltage and safety warnings to be printed on the surface, providing users with clear usage guidance.

[0033] The circuit board 6 is fixedly connected inside the fixed bracket 4 (e.g., Figure 3 As shown, the fixing bracket 4 is preferably made of high-strength insulating plastic and is supported on the upper surface of the battery cap 301 of the lithium battery cell 3. It is located in the top area inside the label 1. The fixing bracket 4 provides a stable mounting carrier for the circuit board 6, avoiding direct contact between the circuit board 6 and the lithium battery cell 3 or the label 1, which could cause short circuits or damage.

[0034] Among them, the circuit board 6 has a 3.7V to 1.5V voltage conversion function, which can stably convert the 3.7V nominal voltage output by the lithium battery cell 3 to 1.5V voltage, adapting to the usage needs of external devices that require 1.5V power supply, such as remote control, small electronic toys, and portable sensors, thus expanding the applicable scenarios of the battery.

[0035] It should be noted that the core principle of the 3.7V to 1.5V voltage conversion of circuit board 6 is based on a low dropout linear regulator (LDO). A stable voltage conversion path is constructed by integrating key components such as LDO chip, input and output capacitors, and feedback resistor. The specific structure and circuit of the low dropout linear regulator (LDO) have been disclosed in existing related technologies and will not be described in detail here. The general workflow is as follows: First, the nominal voltage of 3.7V output from lithium battery cell 3 (the actual voltage will fluctuate between 3.0V and 4.2V during operation) is used as the input voltage. It is regulated and filtered by the input filter capacitor on circuit board 6 to remove ripple signals and ensure that the voltage input to the LDO chip is stable. Then, the reference voltage source, error amplifier, and regulating transistor modules inside the LDO chip work together. The error amplifier compares the difference between the output voltage and the reference voltage in real time and adjusts the conduction level of the regulating transistor according to the difference to stably reduce the input 3.7V voltage to 1.5V. Finally, the output voltage is filtered again by the output filter capacitor and then sent to the output terminal of circuit board 6 to provide stable power to 1.5V power supply devices such as remote controls, small electronic toys, and portable sensors.

[0036] In this embodiment, the circuit board 6 has a charging port 602 integrated on its side. To ensure that the external charger can be connected smoothly, the fixed bracket 4 has a second square hole 403 that corresponds to the position and size of the charging port 602. The top of the label 1 has a first square hole 2 corresponding to the position of the second square hole 403. The charging cable of the external charger can pass through the first square hole 2 and the second square hole 403 in sequence and then connect to the charging port 602 to realize the safe charging operation of the lithium battery.

[0037] The charging port 602 is preferably a Type-C interface. The Type-C interface is only 8.3mm wide and 2.5mm high. Its compact size fits the compact space layout of the circuit board 6 installed inside the fixed bracket 4 and located in the top area of ​​the label 1. When installed on the side of the circuit board 6, it will not take up too much space and helps to optimize the internal structure of the battery.

[0038] To improve the assembly accuracy and stability of the circuit board 6 within the fixed bracket 4, two outwardly protruding clamping plates 604 are fixedly connected to both sides of the circuit board 6 (e.g., Figure 7As shown, the fixed bracket 4 has slots 401 on both sides that are adapted to the shape and size of the card plate 604. At the same time, a positioning hole 405 is fixedly provided at the bottom of the fixed bracket 4, and a positioning post 605 corresponding to the positioning hole 405 is fixedly connected to the lower end face of the circuit board 6. When the circuit board 6 is assembled into the fixed bracket 4, the card plates 604 on both sides of the circuit board 6 can be inserted into the slots 401 on the side walls of the fixed bracket 4 to achieve lateral positioning. The positioning post 605 on the lower end face of the circuit board 6 will be inserted into the positioning hole 405 at the bottom of the fixed bracket 4 to form longitudinal positioning. Through the double positioning structure, the displacement of the circuit board 6 in the fixed bracket 4 is restricted, ensuring that the charging port 602 on the side of the circuit board 6 is always aligned with the second square hole 403 of the fixed bracket 4, and avoiding the charging port 602 from being unusable due to assembly misalignment.

[0039] The fixing bracket 4 has three evenly distributed feet 404 on its bottom circumference, and the top of the battery cap 301 of the lithium battery cell 3 has a mating groove 302 that matches the number, shape, and position of the feet 404. When the fixing bracket 4 is supported on the upper surface of the battery cap 301, the feet 404 at the bottom of the fixing bracket 4 will be inserted into the mating groove 302 at the top of the battery cap 301. Through the fitting and cooperation of the feet 404 and the mating groove 302, the fixing bracket 4 is positioned circumferentially and laterally on the battery cap 301, preventing the fixing bracket 4 from rotating or shifting during battery use, and further ensuring the stability of the connection between the internal circuit board 6, connecting nickel sheet 5, and other components of the fixing bracket 4 and the battery cap 301.

[0040] One end of the connecting nickel sheet 5 is connected to the circuit board 6, and the other end is welded to the battery cap 301, realizing the electrical connection between the circuit board 6 and the lithium battery cell 3, providing a stable conductive channel for the lithium battery cell 3 to transmit electrical energy to the circuit board 6 (for voltage conversion) and for the external charger to charge the lithium battery cell 3 through the circuit board 6.

[0041] The upper edge of the circuit board 6 is provided with a pressing part 601 (e.g., Figure 7 As shown, one end of the connecting nickel sheet 5 is tightly fixed by the crimping part 601 to avoid poor contact between the connecting nickel sheet 5 and the circuit board 6.

[0042] In this embodiment, a first clearance groove 402 is provided on the outer wall of the fixed bracket 4 on the side corresponding to the pressing part 601. The size of the first clearance groove 402 is adapted to the thickness and width of the connecting nickel sheet 5, which can accommodate the connecting nickel sheet 5 to pass through smoothly, and avoid the connecting nickel sheet 5 from being squeezed or rubbed against the outer wall of the fixed bracket 4 during installation or use, so as to ensure that the conductivity of the connecting nickel sheet 5 is not affected.

[0043] The circuit board 6 is provided with gasket I 7 and gasket II 8 on the top. Both are made of insulating and high-temperature resistant elastic material and are both in the form of a ring structure. The center of each gasket is provided with a through hole that matches the positive terminal cap 603 which is fixedly connected to the top of the circuit board 6, so that the positive terminal can pass through the center. This does not affect the normal assembly and conductivity of the positive terminal, and can also protect the connection between the positive terminal and the circuit board 6.

[0044] In this embodiment, when gasket I 7 and gasket II 8 are pressed onto the circuit board 6, both are inserted into the circular fixing bracket 4, and the upper end face of gasket II 8 remains parallel to the end face of the fixing bracket 4 (e.g., Figure 3 (As shown), to ensure the flatness of the internal structure of the battery.

[0045] Among them, a second clearance groove 701 is provided at the position of the crimping part 601 on the upper end face edge of the gasket I 7 corresponding to the circuit board 6 (e.g., Figure 4 As shown, when the gasket 17 is pressed onto the circuit board 6, the second clearance groove 701 can fully expose the crimping part 601 on the circuit board 6, avoiding the gasket 17 from obstructing or interfering with the connection between the crimping part 601 and the connecting nickel sheet 5. It can also accommodate and position the part of the connecting nickel sheet 5 located near the crimping part 601, further limiting the displacement of the connecting nickel sheet 5 and ensuring the stability of the connection between the connecting nickel sheet 5 and the crimping part 601 and the battery cap 301.

[0046] Gasket II 8 has a mating part 801 protruding outward from the edge on one side corresponding to the crimping part 601 (e.g. Figure 4 As shown, when the gasket II 8 is pressed onto the gasket I 7, its main structure can press and fix one end of the connecting nickel sheet 5 on the pressing part 601 and located in the second relief groove 701, further enhancing the tightness of the connection between the connecting nickel sheet 5 and the pressing part 601, and preventing the connecting nickel sheet 5 from loosening due to vibration and impact during battery use; at the same time, the mating part 801 of the gasket I 8 will extend into the first relief groove 402 of the fixing bracket 4, and the positioning of the gasket II 8 is achieved through the fitting and interlocking of the mating part 801 and the first relief groove 402, preventing the gasket II 8 from shifting inside the battery, and ensuring that the pressing effect of the gasket II 8 on the connecting nickel sheet 5 is always stable.

[0047] It should be noted that, since the label 1 forms an outer layer of protection for the lithium battery cell 3 and the fixing bracket 4 in a fully enclosed manner, and the fixing bracket 4 is located in the top area inside the label 1, the gasket II 8 is confined inside the fixing bracket 4 by the label 1 during assembly and cannot be offset laterally or longitudinally. At the same time, the enclosing constraint of the label 1 on the fixing bracket 4 will indirectly exert a downward limiting force on the gasket II 8 inside the fixing bracket 4, ensuring that the gasket II 8 is tightly pressed against the gasket I 7, and will not detach from the gasket I 7 or come out of the fixing bracket 4, thus ensuring its pressing and fixing effect on the connecting nickel sheet 5, as well as its protective effect on the top components of the circuit board 6.

[0048] In summary, in this embodiment, the aforementioned lithium battery cell 3, battery cap 301, fixing bracket 4, circuit board 6, gasket I 7, and gasket I 8 form a interconnected and collaborative system: The lithium battery cell 3 serves as the core of the electrical energy; its top battery cap 301 engages with the bottom support leg 404 of the fixing bracket 4 via a mating groove 302, achieving precise positioning of the fixing bracket 4 and providing a stable foundation for subsequent component assembly; the fixing bracket 4, as an intermediate load-bearing carrier, forms a dual positioning system through a slot 401 and a plate 604 on the circuit board 6, and a positioning hole 405 and a positioning post 605 on the circuit board 6, firmly confining the circuit board 6 internally, while simultaneously providing an installation channel for the connecting nickel sheet 5 via the first clearance groove 402; the circuit board 6 is tightly fixed to one end of the connecting nickel sheet 5 via a pressing part 601, and the other end of the connecting nickel sheet 5 is welded to the battery cap 301, establishing an electrical connection path between the lithium battery cell 3 and the circuit board 6; the gasket I above the circuit board 6... 7. The nickel sheet 5 is positioned and connected by the second clearance groove 701 to avoid the pressing part 601. The pad II 8 is pressed onto the pad I 7. The mating part 801 is embedded in the first clearance groove 402 of the fixing bracket 4 to achieve its own positioning. At the same time, the nickel sheet 5 is pressed tightly. Finally, all internal components are wrapped in the label 1. The label 1 exposes the positive and negative poles through the electrode hole 101. The charging cable is connected through the first square hole 2 and the second square hole 403 of the fixing bracket 4.

[0049] All other parts of this utility model not described herein are the same as existing technology, or are known technology, or can be implemented using existing technology, and will not be described in detail here.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rechargeable lithium battery, characterized in that, include: The lithium battery cell (3) is wrapped in the label (1) to form an outer layer of protection for the lithium battery cell (3). The top and bottom of the label (1) are respectively provided with electrode holes (101), the top electrode hole (101) is used to expose the positive electrode, and the bottom electrode hole (101) is used to expose the negative electrode. The circuit board (6) is fixedly connected inside the fixed bracket (4). The fixed bracket (4) is supported on the upper surface of the battery cap (301) of the lithium battery cell (3) and located in the top area inside the label (1). The side of the circuit board (6) is provided with a charging port (602). An external charger can be connected to the circuit board (6) through the charging port (602) to charge the lithium battery. The circuit board (6) has a 3.7V to 1.5V voltage conversion function, which can stably convert the 3.7V voltage output by the lithium battery cell (3) to 1.5V voltage to adapt to the use requirements of external devices that require 1.5V power supply.

2. The rechargeable lithium battery according to claim 1, characterized in that: A positive electrode cap (603) is fixedly connected to the top of the circuit board (6). A crimping part (601) is provided on the upper edge of the circuit board (6). The crimping part (601) has a protruding or snap-fit ​​structure. The crimping part (601) is connected to one end of the connecting nickel sheet (5). The fixing bracket (4) has a first clearance groove (402) on the outer wall of the side corresponding to the crimping part (601). The other end of the connecting nickel sheet (5) is fixedly connected to the battery cap (301).

3. A rechargeable lithium battery according to claim 2, characterized in that: The circuit board (6) is provided with a gasket I (7) and a gasket II (8) on its upper side. Both gasket I (7) and gasket II (8) are circular ring structures. The center of both gasket I (7) and gasket II (8) is provided with a through hole that matches the positive cap (603). When gasket I (7) and gasket II (8) are pressed onto the circuit board (6), they are inserted into the circular fixing bracket (4) respectively. The upper end face of gasket II (8) is parallel to the end face of the fixing bracket (4). A second clearance groove (701) is provided on gasket I (7) at the position of the edge pressing part (601) of the upper end face of the circuit board (6).

4. A rechargeable lithium battery according to claim 3, characterized in that: The gasket II (8) has a mating part (801) protruding outward from the edge on one side of the crimping part (601). The gasket II (8) is pressed on the gasket I (7) as a whole, forming a pressing and fixing on one end of the connecting nickel sheet (5) on the crimping part (601) and located in the second relief groove (701). The mating part (801) extends into the first relief groove (402) of the fixing bracket (4). The positioning of the gasket II (8) is achieved by the fitting and engaging of the mating part (801) and the first relief groove (402).

5. A rechargeable lithium battery according to claim 1, characterized in that: The circuit board (6) is fixedly connected to two sides with a card plate (604) protruding outward edge, and the fixed bracket (4) has a card slot (401) on both sides that matches the shape and size of the card plate (604).

6. A rechargeable lithium battery according to claim 5, characterized in that: The bottom of the fixed bracket (4) is fixedly provided with a positioning hole (405), and the lower end face of the circuit board (6) is fixedly connected with a positioning post (605). When the card plates (604) on both sides of the circuit board (6) are correspondingly engaged with the card slots (401) on the side wall of the fixed bracket (4), the positioning post (605) on the lower end face of the circuit board (6) is inserted into the positioning hole (405) at the bottom of the fixed bracket (4). The charging port (602) provided on the side of the circuit board (6) faces the second square hole (403) pre-opened on the fixed bracket (4).

7. A rechargeable lithium battery according to claim 6, characterized in that: The top of the label (1) has a first square hole (2) at the position corresponding to the second square hole (403).

8. A rechargeable lithium battery according to claim 1, characterized in that: The fixed bracket (4) has multiple legs (404) evenly distributed around its bottom circumference. The legs (404) are adapted to the docking groove (302) opened on the top of the battery cap (301) of the lithium battery cell (3).

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