Bracket-free rechargeable lithium battery based on in-shell injection molding

Abstract

The support-free rechargeable lithium battery comprises a steel shell, a battery cell and a PCB (Printed Circuit Board), the top end and the bottom end of the steel shell are respectively provided with an upper opening and a lower opening, the battery cell is arranged in the steel shell, the bottom end of the battery cell is provided with a first negative electrode end, and the top end of the battery cell is provided with a positive electrode end and a second negative electrode end. According to the utility model, the gap between the PCB and the steel shell is filled by adopting an in-shell injection molding mode, and the plastic is fluid when being injected, so that the inner side wall of the steel shell and the space (namely the gap between the accommodating space and the PCB) between the top end of the battery cell and the top end of the steel shell can be better filled and contacted, and a larger contact area is achieved; the charging socket can support and buffer the PCB, and the plastic can effectively fill the gap in the accommodating space and the gap between the charging socket and the steel shell (charging opening), so that the waterproof effect on the PCB can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a bracket-free rechargeable lithium battery based on in-shell injection molding. Background Art

[0002] The current rechargeable lithium battery has a complex internal battery structure, and a bracket support structure is generally set inside the battery to support and protect the PCB assembly. However, during mass production, there are certain differences (i.e. errors) in the position of the component patches on the PCB assembly, resulting in deviations in the fit between the circuit components and the bracket support structure, making it easy for the bracket support structure to crush the components. In addition, the bracket support structure is generally made of plastic, which may be damaged when falling, has poor shock absorption and buffering effects, and cannot achieve sealing and waterproofing of the battery. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a bracket-free rechargeable lithium battery based on in-shell injection molding in view of the above shortcomings.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A support-free rechargeable lithium battery based on in-shell injection molding comprises a steel shell, a battery cell and a PCB board, wherein the top and bottom ends of the steel shell are respectively provided with an upper opening and a lower opening, the battery cell is arranged in the steel shell, the bottom end of the battery cell is provided with a first negative terminal, the top end of the battery cell is provided with a positive terminal and a second negative terminal, the first negative terminal of the battery cell is exposed at the lower opening, an accommodating space is provided between the top end of the battery cell and the top end of the steel shell, a charging opening connected to the accommodating space is provided on the upper part of the steel shell, the PCB board is arranged in the accommodating space, the PCB board is electrically connected to the positive terminal and the second negative terminal of the battery cell, a charging socket and a positive pole are provided on the PCB board, the charging socket abuts against the charging opening, the positive pole passes upward through the upper opening, and the gap between the PCB board and the accommodating space is filled with plastic.

[0006] Furthermore, the charging socket is a Type-C charging socket.

[0007] Furthermore, the PCB board is provided with a plurality of status indicator lights, and the plastic is a translucent or transparent material.

[0008] Furthermore, a light-transmitting decorative sheet is provided at the top of the accommodating space, and a through hole cooperating with the positive electrode column is provided at the top of the light-transmitting decorative sheet.

[0009] Furthermore, the upper opening and the lower opening are both half-openings.

[0010] Furthermore, the connection between the PCB board and the positive terminal and the second negative terminal of the battery cell is a hard connection.

[0011] Furthermore, the PCB board is connected to the positive terminal of the battery cell through a first nickel strip, and the PCB board is connected to the second negative terminal of the battery cell through a second nickel strip. The first nickel strip and the second nickel strip are connected to the battery cell by welding, and the first nickel strip and the second nickel strip are connected to the PCB board by welding.

[0012] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0013] The utility model adopts the method of in-shell injection molding to fill the gap between the PCB board and the steel shell. Because the plastic is fluid when injected, it can better fill and contact the inner wall of the steel shell, as well as the space between the top of the battery cell and the top of the steel shell (that is, the gap between the accommodating space and the PCB board), with more contact area, which can support and buffer the PCB board. In addition, because the plastic can effectively fill the gap inside the accommodating space and the gap between the charging socket and the steel shell (charging opening), it can play a waterproof role for the PCB board.

[0014] The utility model improves the lightweight of the battery while simplifying the internal structure of the battery, facilitating the assembly of the battery. Since the plastic is obtained by an in-shell injection molding process, the compatibility with the size of individual components inside the battery can be improved; it has a certain waterproof ability and can effectively isolate the PCB board (i.e., circuit board) inside the battery from the external environment, forming a stable working environment.

[0015] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded schematic diagram of an embodiment of the utility model;

[0017] Figure 2 This is a formal cross-sectional view of an embodiment of the utility model;

[0018] Figure 3 It is a side cross-sectional view of an embodiment of the utility model.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Steel shell; 1a. Accommodation space; 11. Upper opening; 12. Lower opening; 13. Charging opening; 2. Battery cell; 3. PCB board; 4. Charging socket; 5. Positive pole; 6. Plastic; 7. Translucent decorative sheet; 71. Through hole; 81. First nickel strip; 82. Second nickel strip. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise" and "counterclockwise" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, a bracket-free rechargeable lithium battery based on in-shell injection molding includes a steel shell 1, a battery cell 2 and a PCB board 3.

[0025] The steel shell 1 is in the shape of a hollow cylinder. The top and bottom of the steel shell 1 are respectively provided with an upper opening 11 and a lower opening 12. The upper opening 11 and the lower opening 12 are both half-openings. The upper opening 11 and the lower opening 12 can be bent at the top and the bottom of the steel shell by a spinning process to form the upper opening 11 and the lower opening 12. A charging opening 13 is provided at the top of the steel shell 1. The steel shell 1 is a structural component, is not electrically connected to the PCB board 3, and does not participate in the charge and discharge circuit.

[0026] The battery cell 2 is arranged in the steel shell 1, the outer shell part of the battery cell 2 is the negative electrode, and the positive electrode of the battery cell 2 is arranged at the top protrusion of the battery cell, so that the battery cell 2 can form a second negative terminal and a first negative terminal at the outer side of the top and the bottom of the battery cell respectively, the bottom end of the battery cell 2 is provided with a first negative terminal, the top end of the battery cell 2 is provided with a positive terminal and a second negative terminal, and the first negative terminal of the battery cell 2 is exposed at the lower opening 12;

[0027] An accommodating space 1a is reserved between the top of the battery cell 2 and the top of the steel shell 1, and the charging opening 13 is communicated with the accommodating space 1a. The PCB board 3 is arranged in the accommodating space 1a, that is, the PCB board 3 is vertically stacked and assembled above the battery cell 2, and the PCB board 3 is electrically connected to the positive terminal and the second negative terminal of the battery cell 2. The connection method between the PCB board 3 and the battery cell 2 is a hard connection (such as nickel strip welding). A charging socket 4 and a positive pole 5 are provided on the PCB board 3, and the charging socket 4 abuts against the charging opening 13. The positive pole 5 passes through the upper opening 11 upwardly, and the gap between the PCB board 3 and the accommodating space 1a is filled with plastic 6, and the plastic 6 is obtained by an in-shell injection molding process. Before injection molding, the PCB board 3 is connected to the battery cell 2 by welding, and a jig is used to fix the position of the PCB assembly and the charging opening 13 during injection molding.

[0028] Preferably, the charging socket 4 is a Type-C charging socket 4.

[0029] Preferably, the PCB board 3 is provided with a plurality of status indicator lights, the number of which is greater than or equal to 1, the plastic 6 is made of a translucent or transparent material, the light emitted by the status indicator light can pass through the plastic 6 and the light-transmitting decorative sheet 7, and emits light from the PCB board 3 inside the battery to the outside of the battery (such as red light or flashing represents the "charging" state, and green light or constant light represents the "charging completed" state) to display the battery status, thereby improving the aesthetics of the battery and the readability of the battery status light by the user;

[0030] A light-transmitting decorative sheet 7 is disposed at the top of the accommodating space 1 a , and a through hole 71 cooperating with the positive electrode column 5 is disposed at the top of the light-transmitting decorative sheet 7 .

[0031] like Figure 2 and Figure 3 As shown, preferably, the PCB board 3 is connected to the positive terminal of the battery cell 2 through the first nickel strip 81, and the PCB board 3 is connected to the second negative terminal of the battery cell 2 through the second nickel strip 82, and the first nickel strip 81 and the second nickel strip 82 are connected to the battery cell 2 by welding, and the first nickel strip 81 and the second nickel strip 82 are connected to the PCB board 3 by welding.

[0032] As an implementation method, the number of the battery cells 2 can be increased or decreased according to actual needs, and can be single or multiple. When there are multiple battery cells, the multiple battery cells can be connected in parallel or in series, and the multiple battery cells are connected in parallel or in series through nickel strips, and then led out through the positive terminal and the negative terminal.

[0033] Charging circuit: Type-C charging socket 4 → PCB board 2 → first nickel strip 81 → positive terminal of battery cell 2 → second negative terminal of battery cell 2 → second nickel strip 82 → PCB board 2 → Type-C charging socket 4.

[0034] Discharge circuit: positive terminal of the battery cell 2 → first nickel strip 81 → PCB board 2 → positive electrode column 5 → load → first negative terminal of the battery cell 2 .

[0035] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A bracket-free rechargeable lithium battery based on in-shell injection molding, characterized in that: The invention comprises a steel shell (1), a battery cell (2) and a PCB board (3), wherein the top and bottom of the steel shell (1) are respectively provided with an upper opening (11) and a lower opening (12), the battery cell (2) is arranged in the steel shell (1), the bottom of the battery cell (2) is provided with a first negative terminal, the top of the battery cell (2) is provided with a positive terminal and a second negative terminal, the first negative terminal of the battery cell (2) is exposed at the lower opening (12), an accommodation space (1a) is provided between the top of the battery cell (2) and the top of the steel shell (1), and the steel shell (1) is provided with a positive terminal and a second negative terminal. A charging opening (13) communicating with the accommodating space (1a) is provided at the upper portion, the PCB board (3) is arranged in the accommodating space (1a), the PCB board (3) is electrically connected to the positive terminal and the second negative terminal of the battery cell (2), a charging socket (4) and a positive pole (5) are provided on the PCB board (3), the charging socket (4) abuts against the charging opening (13), the positive pole (5) passes through the upper opening (11) upwards, and the gap between the PCB board (3) and the accommodating space (1a) is filled with plastic (6).

2. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 1 is characterized in that: The charging socket (4) is a Type-C charging socket (4).

3. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 1 is characterized in that: The PCB board (3) is provided with a plurality of status indicator lights, and the plastic (6) is made of a translucent or transparent material.

4. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 3 is characterized in that: A light-transmitting decorative sheet (7) is provided at the top of the accommodating space (1a), and a through hole (71) cooperating with the positive electrode column (5) is provided at the top of the light-transmitting decorative sheet (7).

5. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 1, characterized in that: The upper opening (11) and the lower opening (12) are both half-openings.

6. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 1, characterized in that: The connection mode between the PCB board (3) and the positive terminal and the second negative terminal of the battery cell (2) is hard connection.

7. The bracket-free rechargeable lithium battery based on in-shell injection molding according to claim 6, characterized in that: The PCB board (3) is connected to the positive terminal of the battery cell (2) via a first nickel strip (81), and the PCB board (3) is connected to the second negative terminal of the battery cell (2) via a second nickel strip (82); the first nickel strip (81) and the second nickel strip (82) are connected to the battery cell (2) by welding, and the first nickel strip (81) and the second nickel strip (82) are connected to the PCB board (3) by welding.

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