Soft package injection molding battery

Abstract

The utility model relates to a soft package injection molding battery which comprises a soft package battery cell, side edge adhesive tapes are respectively adhered to two side edges of the soft package battery cell, a groove adhesive tape is adhered to the front edge of the soft package battery cell, a first tab and a second tab of the soft package battery cell are respectively and fixedly connected with a protection plate, and the soft package battery cell is embedded into a rubber frame. And the front and back surfaces of the soft package battery core are fixedly connected with the steel sheets through double faced adhesive tapes to form an integral structure of the soft package injection molding battery. The whole battery structure formed by the soft package battery core, the protection plate, the rubber frame, the steel sheet, the low-temperature injection molding rubber and the label is adopted, the operation is convenient, and the yield is improved. The battery assembly structure can effectively ensure high capacity, high safety and low manufacturing cost of the battery, and improves competitive advantages.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a soft-pack injection-molded battery. Background Art

[0002] At present, there are more and more electronic terminal products such as smart phones, smart bracelets, smart watches, and graphic calculators. Consumers have higher and higher requirements for battery capacity and battery safety, and there is also an increasing demand for the diversity of battery shapes. It is particularly important to combine the advantages of soft-pack batteries with high energy density and variable shapes with the high safety of aluminum shell batteries.

[0003] At present, there are four options for battery assembly structures and their respective advantages and disadvantages: ① Soft-pack battery + protection plate + tape + label, simple process, high capacity, poor appearance consistency, and low safety; ② Soft-pack battery + protection plate + rubber frame + low-temperature injection molding glue + label, high capacity, low safety; ③ Soft-pack battery + top shell + bottom shell + protection plate + sheet aluminum alloy + low-temperature injection molding glue + label, complex process and high cost; ④ Aluminum shell battery + protection plate + top shell + bottom shell + high-temperature injection molding glue + label, low capacity and high safety. The above four battery assembly structures cannot meet the market demand in terms of high capacity, high safety and low cost, and have no competitive advantage. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provides a soft-package injection-molded battery, which can effectively ensure high battery capacity, high safety and low manufacturing cost.

[0005] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a soft-pack injection molded battery, including a soft-pack battery cell, a steel sheet, a rubber frame and a protective plate, the two sides of the soft-pack battery cell are respectively pasted with side tapes, the front edge of the soft-pack battery cell is pasted with a groove tape, the first pole ear and the second pole ear of the soft-pack battery cell are respectively fixedly connected to the protective plate, the soft-pack battery cell is embedded in the rubber frame, and the front and back sides of the soft-pack battery cell are fixedly connected to the steel sheet by double-sided tape to form the overall structure of the soft-pack injection molded battery.

[0006] Furthermore, the protective plate includes a first nickel strip, a second nickel strip, four protruding buckles and a gold-plated terminal. The first nickel strip is fixedly connected to the first pole ear, the second nickel strip is fixedly connected to the second pole ear, the protruding buckles are symmetrically placed on the upper and lower sides of the protective plate, and the gold-plated terminals are placed on the opposite surfaces of the first nickel strip and the second nickel strip of the protective plate.

[0007] Furthermore, foam is pasted between the protection plate and the front edge of the soft-pack battery cell.

[0008] Furthermore, the glue frame includes four snap positions, a first step, a second step, four glue injection ports and arcs on both sides, forming an overall glue frame structure, and the raised buckles of the protection plate are snapped into the snap positions of the glue frame.

[0009] Furthermore, the steel sheet comprises two inner arcs and four glue injection ports. The two side edges of the steel sheet are folded into inner arcs along the longitudinal inner surface thereof, and the glue injection ports are arranged on the inner arcs.

[0010] Furthermore, the steel sheet is positioned by the first step of the rubber frame, and the inner arc of the steel sheet is completely matched and fitted with the arcs of the two side edges of the rubber frame.

[0011] Beneficial effects: Compared with the prior art, the soft-pack battery cell + protective plate + glue frame + steel sheet + low-temperature injection glue + label of the utility model constitutes an overall battery structure, wherein the glue frame is provided with two steps, and the steel sheet is positioned and pasted on the front and back sides of the soft-pack battery cell through the first step of the glue frame, and the steel sheet is overlapped on the first step of the glue frame, so that the soft-pack battery cell is completely non-leaky, and only four glue injection ports are retained to ensure that there is no glue overflow during injection molding; the operation is convenient and the yield rate is improved. This battery assembly structure can effectively ensure high battery capacity, high safety and low manufacturing cost, and improve competitive advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0013] Figure 2 It is a three-dimensional structural schematic diagram of the soft-pack battery cell of the utility model;

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure of the soft-pack battery after the side tape is attached;

[0015] Figure 4 It is a schematic diagram of the three-dimensional structure of the soft-pack battery after the groove tape is pasted;

[0016] Figure 5a-Figure 5b It is a schematic diagram of the three-dimensional structure of the protection plate;

[0017] Figure 6 It is a schematic diagram of the three-dimensional structure after the protection board and the soft-pack battery cell are welded;

[0018] Figure 7 This is a schematic diagram of the three-dimensional structure of the soft-pack battery after the foam is attached;

[0019] Figure 8 It is a three-dimensional structural diagram of the plastic frame;

[0020] Fig. 9 It is a schematic diagram of the three-dimensional structure after the soft-pack battery is embedded in the rubber frame;

[0021] Fig.10 It is a schematic diagram of the three-dimensional structure of the steel sheet;

[0022] Fig.11 It is a schematic diagram of the relative positions of the steel sheet, double-sided adhesive tape and soft-pack battery;

[0023] Fig.12 It is a schematic diagram of the three-dimensional structure of the soft-pack battery before injection molding;

[0024] Fig.13 It is a schematic diagram of the three-dimensional structure of a soft-pack battery.

[0025] In the figure: 10, soft-pack battery cell, 11, side, 12, front edge, 13, first pole ear, 14, second pole ear, 20, side tape, 30, groove tape, 40, protection plate, 41, first nickel strip, 42, second nickel strip, 43, raised buckle, 44, gold-plated terminal, 50, foam, 60, glue frame, 61, clamping position, 62, first step, 63, second step, 64, glue injection port, 65, arc, 70, double-sided tape, 80, steel sheet, 81, inner arc, 82, glue injection port, 100, label. DETAILED DESCRIPTION

[0026] The following is a detailed description of the specific implementation method provided according to the utility model in combination with the preferred embodiments: See the accompanying drawings for details. This embodiment provides a soft-pack injection molded battery, including a soft-pack battery cell 10, a steel sheet 80, a rubber frame 60 and a protective plate 40. The two sides of the soft-pack battery cell are respectively adhered with side tapes 20, and the front edge of the soft-pack battery cell is adhered with a groove tape 30. The first pole ear 13 and the second pole ear 14 of the soft-pack battery cell are respectively fixed to the protective plate, and the soft-pack battery cell is embedded in the rubber frame 60. The front and back sides of the soft-pack battery cell are fixed to the steel sheet by double-sided tape 70 to form the overall structure of the soft-pack injection molded battery.

[0027] The preferred solution of this embodiment is that the protective plate 40 includes a first nickel strip 41, a second nickel strip 42, four protruding buckles 43 and a gold-plated terminal 44, the first nickel strip is fixedly connected to the first pole ear, the second nickel strip is fixedly connected to the second pole ear, the protruding buckles are symmetrically placed on the upper and lower sides of the protective plate, and the gold-plated terminals are placed on the opposite surfaces of the first nickel strip and the second nickel strip of the protective plate.

[0028] A preferred solution of this embodiment is that foam 50 is pasted between the protection plate and the front edge of the soft-pack battery cell.

[0029] The preferred solution of this embodiment is that the glue frame includes four snap positions 61, a first step 62, a second step 63, four glue injection ports 64 and arcs 65 on both sides to form an overall glue frame structure, and the protruding buckles of the protection plate are snapped into the snap positions of the glue frame.

[0030] The preferred solution of this embodiment is that the steel sheet includes two inner arcs 81 and four glue injection ports 82, and the two side edges of the steel sheet are folded into inner arcs along the longitudinal inner surface, and the inner arcs are provided with glue injection ports.

[0031] A preferred solution of this embodiment is that the steel sheet is positioned by the first step of the rubber frame, and the inner arc of the steel sheet is completely matched and fitted with the arcs of the two side edges of the rubber frame.

[0032] Combined with the analysis of the specific structure of the operation steps: a soft-pack injection molded battery,

[0033] 1. The soft-pack battery cell 10 includes a side 11, a front edge 12, a first pole ear 13, and a second pole ear 14; then the side tape 20 is pasted on the two side edges 11 of the soft-pack battery cell 10, so that the metal edge of the side 11 of the soft-pack battery cell is not exposed, so as to prevent the steel sheet 80 from contacting the metal edge of the side of the soft-pack battery cell and causing a short circuit;

[0034] 2. Then, the groove tape 30 is pasted on the front edge 12 of the soft-pack battery cell 10 so that the metal edge of the front edge of the soft-pack battery cell is not exposed, thereby preventing the protection plate 40 from contacting the metal edge of the front edge of the soft-pack battery cell and causing a short circuit;

[0035] The protective plate 40 includes a first nickel strip 41, a second nickel strip 42, four protruding buckles 43 and a gold-plated terminal 44. The gold-plated terminal of the battery is equivalent to the output end of the battery, which is used to be electrically connected to the terminal for charging and discharging;

[0036] 3. Then, the first pole ear 13 and the second pole ear 14 of the soft-pack battery cell are respectively connected and fixed to the first nickel strip 41 and the second nickel strip 42 of the protection plate 40 by laser welding; the welding method is not limited to laser welding, and can also be resistance welding, soldering, ultrasonic welding and other welding methods;

[0037] 4. Bend the protection plate 40 according to conventional processes;

[0038] 5. Then, the foam 50 is pasted in the gap between the front edge 12 of the soft-pack battery cell 10 and the protection plate 40. The protection plate is supported by the foam 50. The soft-pack battery is easier to operate when embedded in the rubber frame 60. The foam must have a certain hardness requirement, and the Shore hardness is about 35°C.

[0039] The plastic frame 60 includes four clamping positions 61, a first step 62, a second step 63, four plastic injection ports 64 and arcs 65 on both sides, wherein the material of the plastic frame is PC or ABS or a mixture of PC and ABS;

[0040] 6. The soft-pack battery cell is placed in the plastic frame 60. At this time, the four protruding buckles 43 of the protection plate 40 are clamped and positioned through the four clamping positions 61 of the plastic frame to ensure that the gold-plated terminal 44 is at a height above the top of the plastic frame 60.

[0041] The positions of the four snap-in positions 61 of the rubber frame and the positions of the four raised snap-in positions 43 of the protective plate are matched one by one, and after the soft-pack battery cell is put into the rubber frame 60, it is ensured that the height of the four raised snap-in positions 43 cannot exceed the outer surface of the rubber frame; It should be noted that: the rubber frame structure refers to the utility model patent with application number: 202420796268X: "A rubber frame structure for soft-pack injection-molded batteries"

[0042] The steel sheet 80 includes two inner arcs 81 and four glue injection ports 82. The material of the steel sheet is soft stainless steel, which is easier to shape and less likely to rebound.

[0043] 7. The steel sheet 80 is pasted on the front and back sides of the previous soft-pack battery cell by double-sided tape. The steel sheet is pasted on the front and back sides of the battery in relative position. Since the steel sheet is harder, the battery is not easily punctured or crushed, thereby improving the safety performance of the battery;

[0044] 8. The steel sheet 80 is positioned by the first step 62 of the plastic frame 60. At the same time, the inner arc 81 of the steel sheet 80 and the arcs 65 on both sides of the plastic frame 60 are completely matched and fitted, thereby increasing the stability of the structure. This ensures that there will be no defects such as overflow and flash during the injection of glue, thereby improving the yield rate of the injection molding process and making up for the defect of unstable size of the soft-pack battery.

[0045] 9. The front-end battery with the steel sheet attached is a soft-pack battery with side tapes attached to the two sides and groove tapes attached to the front edge. The first pole ear and the second pole ear of the soft-pack battery are respectively fixed to the protection plate, and then the soft-pack battery is embedded in the glue frame. The front and back sides of the soft-pack battery are fixed to the steel sheet by double-sided tape. In this state, glue is injected through a high-pressure injection mold. Since there are four injection ports, it is easier to fill the gap inside the battery with injection glue, increase the strength of the battery, and improve the safety performance of the soft-pack battery; the injection glue is a low-temperature injection glue;

[0046] 10. Position and paste the label 100 through the second step 63 of the plastic frame 60, so that the label pasting process is easier to operate. The soft-pack injection-molded battery is completed.

[0047] The overall structure of the utility model is soft-pack battery cell + protection plate + glue frame + steel sheet + low-temperature injection glue + label. Firstly, the position of the glue frame for positioning the protection plate is a hollow position design. At the same time, the protective plate is correspondingly designed with a raised buckle at the position of the hollow position of the glue frame, which can completely position the protection plate. At the same time, the protection plate is very easy to enter the glue frame, and it can be ensured that the protection plate is not skewed after entering the glue frame; the glue frame is provided with two steps, and the steel sheet is positioned and pasted on the front and back sides of the soft-pack battery cell through the first step of the glue frame. The steel sheet is overlapped on the first step of the glue frame, so that the soft-pack battery cell is completely prevented from leaking out, and only four glue injection ports are retained, so there is no need to worry about glue overflow during injection molding; then the positioning label is pasted through the second step, and the label is very easy to be successfully positioned at one time.

[0048] The detailed description of a soft-pack injection-molded battery with reference to the above embodiment is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the utility model should fall within the scope of protection of the utility model.

Claims

1. A soft-pack injection-molded battery, characterized in that: It includes a soft-pack battery cell, a steel sheet, a rubber frame and a protective plate. The two sides of the soft-pack battery cell are respectively adhered with side tapes, the front edge of the soft-pack battery cell is adhered with a groove tape, the first pole ear and the second pole ear of the soft-pack battery cell are respectively fixed to the protective plate, the soft-pack battery cell is embedded in the rubber frame, and the front and back sides of the soft-pack battery cell are fixed to the steel sheet by double-sided tape to form the overall structure of the soft-pack injection molded battery.

2. The soft-pack injection-molded battery according to claim 1, characterized in that: The protective plate includes a first nickel strip, a second nickel strip, four protruding buckles and a gold-plated terminal. The first nickel strip is fixedly connected to the first pole ear, the second nickel strip is fixedly connected to the second pole ear, the protruding buckles are symmetrically arranged on the upper and lower sides of the protective plate, and the gold-plated terminal is arranged on the opposite surfaces of the first nickel strip and the second nickel strip of the protective plate.

3. The soft-pack injection-molded battery according to claim 1 or 2, characterized in that: Foam is pasted between the protection plate and the front edge of the soft-pack battery cell.

4. The soft-pack injection-molded battery according to claim 1, characterized in that: The glue frame comprises four clamping positions, a first step, a second step, four glue injection ports and arcs on both sides, forming an overall glue frame structure, and the raised buckles of the protection plate are clamped on the clamping positions of the glue frame.

5. The soft-pack injection-molded battery according to claim 1, characterized in that: The steel sheet comprises two inner arcs and four glue injection ports. The two side edges of the steel sheet are folded into inner arcs along the longitudinal inner surface thereof. The glue injection ports are arranged on the inner arcs.

6. The soft-pack injection-molded battery according to claim 1 or 5, characterized in that: The steel sheet is positioned by the first step of the rubber frame, and the inner arc of the steel sheet is completely matched and fitted with the arcs of the two side edges of the rubber frame.

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