A soft-pack lithium-ion battery structure

Abstract

This utility model discloses a soft-pack lithium-ion battery structure, including a soft-pack cell and an injection-molded protective frame; the soft-pack cell and a protective plate are embedded in the inner cavity of the cell protective frame; the cell protective frame has openings on the left and right sides; a steel plate is fixedly installed on each of the left and right sides of the soft-pack cell; the protective plate is located directly above the soft-pack cell; a side tape is glued to the front and rear sides of the soft-pack cell; a grooved tape is glued to the top left side of the soft-pack cell; the positive and negative tabs on the top of the soft-pack cell are electrically connected to the protective plate; a label sleeve is provided on the outer circumference of the cell protective frame; the injection-molded protective frame is installed in the gap between the overall structure composed of the soft-pack cell and the protective plate and the cell protective frame; the left and right sides of the cell protective frame are engaged with two steel plates on the left and right sides of the soft-pack cell; this utility model enables the soft-pack cell to withstand greater external pressure when subjected to external force, effectively preventing battery cell deformation and improving overall safety performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a soft-pack lithium-ion battery structure. Background Technology

[0002] Currently, lithium-ion batteries have advantages such as high specific energy, high cycle life, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools. Therefore, the safety performance requirements for lithium-ion batteries are becoming increasingly stringent.

[0003] For pouch lithium-ion batteries, the output terminals are usually made of aluminum or nickel and are welded or riveted to portable electronic devices such as small cameras, electronic watches, wireless mice, wireless keyboards, and electronic cigarettes.

[0004] Soft-pack lithium-ion batteries are inherently flexible, and when subjected to external pressure, the cells inside are prone to deformation. This makes lithium-ion transport within the cells difficult, increasing internal resistance and reducing charge / discharge efficiency. Furthermore, severe compression can cause the separator to rupture or shift, leading to direct contact between the positive and negative electrodes and an internal short circuit. A short circuit can trigger a sudden release of large amounts of heat and energy, potentially causing overheating, fire, or even explosion, posing a significant safety hazard.

[0005] Therefore, there is an urgent need to develop a technology that can provide safety protection for pouch lithium-ion batteries, enabling the battery cells to withstand greater external pressure when subjected to external forces, effectively preventing battery cell deformation, and improving the overall safety performance of pouch lithium-ion batteries. Utility Model Content

[0006] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a soft-pack lithium-ion battery structure.

[0007] Therefore, this utility model provides a soft-pack lithium-ion battery structure, which includes: a soft-pack cell, side tape, grooved tape, protective plate, cell protective frame, steel sheet, injection molded protective frame and label sleeve; The hollow cell protective frame contains a soft-pack cell and a protection board. The battery cell protective frame has openings on both the left and right sides; On each of the left and right sides of the soft-pack battery cell, a vertically distributed steel sheet is fixedly installed. The protection board is located directly above the soft-pack battery cell; The front and back sides of the soft-pack battery cell are each glued with a side tape. On the top left side of the pouch cell, there is a grooved adhesive tape. The positive and negative tabs at the top of the pouch cell are electrically connected to the protection board, respectively. A label sleeve is provided around the outer circumference of the battery cell protective frame; A plastic protective frame is installed in the gap between the overall structure consisting of the soft-pack battery cell and the protection board and the battery cell protective frame. The left and right sides of the cell protection frame are engaged with the two steel plates located on the left and right sides of the soft-pack cell; The battery cell protective frame includes a first slot and three second slots; A first slot is provided at the bottom left and right center of the top frame of the battery cell protective frame; On the top left and right sides of the bottom edge of the battery cell protective frame, there are three equally spaced second slots. The top of the steel sheet has a first snap-fit ​​protrusion at a position corresponding to the first slot; The first snap-fit ​​protrusion snaps into the corresponding first slot. At the bottom of the steel sheet, a second snap-fit ​​protrusion is provided at the position corresponding to each second slot; The second snap-fit ​​protrusion snaps into the corresponding second slot.

[0008] As can be seen from the technical solution provided by this utility model above, compared with the prior art, this utility model provides a soft-pack lithium-ion battery structure with a scientific structural design that can provide safety protection for the soft-pack lithium-ion battery. When the battery cell is subjected to external pressure, it can withstand greater external pressure, effectively prevent the battery cell from deforming, improve the overall safety performance of the soft-pack lithium-ion battery, and help improve the market application prospects of battery manufacturers' products, which has significant practical significance.

[0009] Furthermore, the steel sheet positioning and installation method adopted in this utility model is not only convenient to operate, but also prevents the steel sheet from being misaligned, ensuring the installation quality and efficiency of the steel sheet and reducing labor costs.

[0010] By applying this utility model, safety protection can be provided for pouch lithium-ion batteries, enabling the battery cells to maintain shape stability when subjected to external pressure, effectively preventing deformation and damage to the battery cells, thereby protecting the internal electrodes, separators and other structures of the battery cells from damage, and ensuring the performance and safety of pouch lithium-ion batteries. Attached Figure Description

[0011] Figure 1 A three-dimensional explosion-decomposition diagram of a soft-pack lithium-ion battery structure provided by this utility model; Figure 2A schematic diagram of the cell protective frame in a soft-pack lithium-ion battery structure provided by this utility model; Figure 3 A three-dimensional structural diagram of the steel sheet in a soft-pack lithium-ion battery structure provided by this utility model; Figure 4 A three-dimensional structural diagram showing the relative positions of the steel sheet and the cell protective frame in a soft-pack lithium-ion battery structure provided by this utility model; Figure 5 A schematic diagram of a soft-pack lithium-ion battery structure provided by this utility model, after assembly of steel sheet and cell protective frame; Figure 6 This is a schematic diagram of the top structure of the protection board in a soft-pack lithium-ion battery structure provided by this utility model; Figure 7 This is a schematic diagram of the bottom structure of the protection board in a soft-pack lithium-ion battery structure provided by this utility model. Detailed Implementation

[0012] 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.

[0013] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0014] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0016] See Figures 1 to 7 This utility model provides a soft-pack lithium-ion battery structure, including: a soft-pack cell 10, a side tape 20, a grooved tape 30, a protective plate 40, foam 50, a cell protective frame 60, double-sided adhesive 70, a steel sheet 80, an injection-molded protective frame 90, and a label sleeve 100. The hollow cell protective frame 60 has a soft-pack cell 10 and a protection board 40 embedded in its inner cavity; The battery cell protective frame 60 has openings on both the left and right sides; On the left and right sides of the soft-pack battery cell 10, a vertically distributed steel sheet 80 is fixedly installed respectively. The protection board 40 is located directly above the soft-pack battery cell 10; The front and rear sides of the soft-pack battery cell 10 are respectively glued with a side tape 20; A grooved tape 30 is adhered to the top left side (i.e. the top leading edge) of the soft-pack battery cell 10; The positive tab 101 and negative tab 102 at the top of the soft-pack battery cell 10 are electrically connected to the protection plate 40 (specifically, they are welded). A label sleeve 100 is provided around the outer circumference of the battery cell protective frame 60; A plastic injection molded protective frame 90 is installed in the gap between the overall structure consisting of the soft-pack battery cell 10 and the protection board 40 and the battery cell protective frame 60.

[0017] In this utility model, specifically, the injection molding protective frame 90 is formed by injecting injection molding compound into the gap between the integral structure composed of the soft-pack battery cell 10 and the protective plate 40 and the battery cell protective frame 60, that is, it is formed by injection molding process.

[0018] It should be noted that, in this utility model, specifically, the injection-molded protective frame 90 is formed by injecting glue into the gap between the integral structure 0 composed of the soft-pack battery cell 10 and the protective plate 40 and the battery cell protective frame 60. Specifically, it can be achieved by filling the gap between the integral structure composed of the soft-pack battery cell 10 and the protective plate 40 and the battery cell protective frame 60 with injection-molded glue using existing injection molding processes to form the injection-molded protective frame 90, thereby increasing the strength of the battery and improving the safety performance of the soft-pack battery. Specifically, the injection molding process that can be used is a low-temperature injection molding process.

[0019] It should be noted that, for this utility model, the injection molding compound is injected into the gaps of the battery in a molten state under low pressure (specifically, the gap between the integral structure composed of the soft-pack cell 10 and the protection plate 40 and the cell protective frame 60), and after curing, it forms... Figure 1 The shape of the injection-molded protective frame 90 shown.

[0020] In this utility model, specifically, a positive conductive sheet 41 and a negative conductive sheet 42 are respectively provided at the bottom two ends of the protection plate 40; On the left and right sides of the protective plate 40, there are two snap-fit ​​protrusions 43 protruding outwards respectively; The two snap-fit ​​protrusions 43 are symmetrically distributed front and back; The top of the protection plate 40 is provided with a positive output terminal 441 and a negative output terminal 442 that are spaced apart. It should be noted that the positive output terminal 441 and the negative output terminal 442 on the protection board 40 are used to connect to external electrical equipment and supply power to the external equipment.

[0021] In practice, the positive output terminal 441 and the negative output terminal 442 are electrically connected to the positive conductive plate 41 and the negative conductive plate 42, respectively.

[0022] It should be noted that the protection board 40 is a conventional design on existing soft-pack lithium-ion batteries, and its specific design and working principle will not be described in detail here.

[0023] In practice, the cell protection frame 60 has a positive output end exposure window and a negative output end exposure window respectively at positions corresponding to the positive output end and the negative output end on the top of the protection board 40.

[0024] In practice, the top edge of the cell protection frame 60 is provided with a protrusion snap-fit ​​groove 65 at the position corresponding to each snap-fit ​​protrusion 43 on the protection plate 40. The snap-fit ​​protrusion 43 and the snap-fit ​​groove 65 are engaged in a corresponding snap-fit.

[0025] In this utility model, specifically, the left and right sides of the soft-pack battery cell 10 are respectively bonded to a steel sheet 80.

[0026] In this utility model, specifically, a strip of foam 50 is bonded between the top left side (i.e. the top front edge) of the soft-pack battery cell 10 and the bottom of the protective plate 40.

[0027] In practice, foam 50 is located on top of the grooved tape 30.

[0028] In this utility model, the left and right sides of the battery cell protective frame 60 are correspondingly engaged with the two steel plates 80 located on the left and right sides of the soft-pack battery cell 10. For specific implementation details, see [link to implementation details]. Figure 2 As shown, the battery cell protective frame 60 includes a first slot 61 and three second slots 62; A first slot 61 is provided at the bottom left and right center of the top frame of the battery cell protective frame 60; On the top left and right sides of the bottom edge of the battery cell protective frame 60, there are three equally spaced second slots 62. The top of the steel sheet 80 is provided with a first snap-fit ​​protrusion 81 at a position corresponding to the first slot 61; The first snap-fit ​​protrusion 81 is snapped into the first snap-fit ​​slot 61. At the bottom of the steel sheet 80, a second snap-fit ​​protrusion 82 is provided at a position corresponding to each second snap-fit ​​slot 62; The second snap-fit ​​protrusion 82 snaps into the second snap-fit ​​slot 62.

[0029] In practice, the material of the cell protection frame 60 can be PC, ABS, or a mixture of PC and ABS.

[0030] It should be noted that, in this utility model, each steel sheet 80 is inserted into the four slots of the battery cell protective frame 60 through four snap-fit ​​protrusions (i.e., snap-fit ​​positions) to achieve positioning.

[0031] It should be noted that the shape and size of the first slot 61 and the second slot 62 on the battery cell protective frame 60 correspond to and match the shape and size of the first snap-fit ​​protrusion 81 and the second snap-fit ​​protrusion 82 (a total of four snap-fit ​​positions) on the steel sheet 80, and cover the tolerance of the steel sheet 80 snap-fit ​​positions.

[0032] In practice, for each steel sheet 80, a side protective strip 83 is provided at both its front and rear ends on the side facing the battery cell protective frame 60. The cell protection frame 60 has side protection strip receiving grooves 63 at positions corresponding to the side protection strips 83 on each steel sheet 80; The side guard strip 83 is located in the side guard strip receiving groove 63; Furthermore, the side guard strip 83 is engaged with the side guard strip receiving groove 63.

[0033] Furthermore, each side protective strip 83 has an adhesive injection notch 84 at its upper and lower ends; The side protective strip receiving groove 63 on one side of the cell protective rubber frame 60 has an adhesive inlet 64 at a position corresponding to the adhesive injection notch 84.

[0034] Based on the above design, the steel sheet of this utility model can be conveniently and reliably positioned and assembled, ensuring the installation reliability of the steel sheet and making it less prone to loosening.

[0035] The steel sheet positioning and installation method adopted in this utility model involves setting slots at the head and tail (i.e., the top and bottom edges) of the cell protective frame 60. The slots (i.e., the snap-fit ​​protrusions) on the steel sheet are positioned by inserting into these slots on the cell protective frame 60, and then respectively pasted onto the front and back sides of the soft-pack cell 10. This method is not only convenient to operate, but also prevents the steel sheet from being misaligned, ensuring the installation quality and efficiency. Without this steel sheet positioning method, directly pasting the steel sheet to the side of the soft-pack battery can easily lead to incorrect pasting position and misalignment, requiring time-consuming rework to correct the error, resulting in high labor costs. Otherwise, it would be impossible to install the soft-pack cell with the pasted steel sheet into the cell protective frame.

[0036] In this utility model, the steel sheet set on the outside of the soft-pack battery cell, with its hard material and excellent corrosion resistance, together with the battery cell protective frame 60 and the injection-molded protective frame 90, can provide comprehensive protection for the soft-pack battery cell inside, effectively isolate it from the internal and external environments, and effectively block the intrusion of water molecules in the external environment, which is conducive to ensuring and improving the safety, stability and service life of the battery.

[0037] In this utility model, specifically, the inner side of the label sleeve 100 is bonded to the outer surface of the battery cell protective frame 60.

[0038] To better understand the technical solution of this utility model, the main assembly process of this utility model is described below.

[0039] First, attach the side tape 20 to the front and back sides of the soft-pack battery cell 10 so that the metal edges of the soft-pack battery cell 10 are not exposed, thus preventing the steel sheet 80 from contacting the metal edges of the soft-pack battery cell and causing a short circuit. Then, the grooved tape 30 is attached to the top left side (top leading edge) of the soft-pack battery cell 10 so that the metal edge of the top left side (top leading edge) of the soft-pack battery cell 10 is not exposed, thus preventing the protection board 40 from contacting the metal edge of the top left side (top leading edge) of the soft-pack battery cell 10 and causing a short circuit. Then, the positive tab 101 and negative tab 102 on the soft-pack battery cell 10 are connected and fixed to the positive conductive sheet 41 and negative conductive sheet 42 of the protection board 40 by laser welding; of course, it is not limited to laser welding, but can also be other welding methods such as resistance welding, tin welding, and ultrasonic welding. Then, the protective plate is bent 40 degrees according to the standard process; Then, the foam 50 is pasted into the gap between the top left side (top front edge) of the soft-pack battery cell 10 and the protective plate 40. The protective plate 40 is supported by the foam 50, which makes it easy to operate when the soft-pack battery 10 is embedded in the battery cell protective frame 60. The foam 50 has a certain hardness requirement, with a Shore hardness of about 35°C. Then, the soft-pack battery cell 10 is installed into the battery cell protective frame 60. The four protrusions 43 on the protection board 40 are locked and positioned by the four protrusions 65 on the battery cell protective frame. After the soft-pack battery cell is installed into the battery cell protective frame 60, the height of the four protrusions 43 on the protection board 40 must not exceed the outer surface of the battery cell protective frame 60.

[0040] Then, the steel sheet 80 is attached to the left and right sides of the soft-pack battery cell 10 using double-sided tape 70. Given the hardness of the steel sheet, the battery is less likely to be punctured or damaged, thereby improving the battery's safety performance. Then, the side protective strip 83 on the steel sheet 80 is fitted and connected with the side protective strip receiving groove 63 on the cell protective frame 60 to increase the stability of the overall structure. This helps to ensure that no defects such as overflow or burrs are generated during injection, improves the yield rate of the injection molding process, and at the same time makes up for the defect of unstable size of soft pack batteries. Then, the front battery structure formed above is injected with glue. Specifically, the glue can be injected using a conventional high-pressure injection mold. The glue injection notch 84 on the steel sheet 80 and the glue injection inlet 64 at the corresponding position of the cell protection frame 60 facilitate the injection of the glue into the front battery structure formed above, so that the glue fills the gap inside the front battery structure, increases the strength of the battery, and improves the safety performance of the soft pack battery. Then, the label sleeve 100 is placed on the outside of the cell protective frame 60 and bonded together to obtain the finished soft-pack lithium-ion battery, which is a soft-pack injection molded battery.

[0041] Compared with existing technologies, this utility model provides a soft-pack lithium-ion battery structure with a scientifically designed structure that can provide safety protection for the soft-pack lithium-ion battery. When the battery cell is subjected to external pressure, it can withstand greater external pressure, effectively preventing the battery cell from deforming, improving the overall safety performance of the soft-pack lithium-ion battery, and enhancing the market application prospects of battery manufacturers' products. It has significant practical significance.

[0042] Furthermore, the steel sheet positioning and installation method adopted in this utility model is not only convenient to operate, but also prevents the steel sheet from being misaligned, ensuring the installation quality and efficiency of the steel sheet and reducing labor costs.

[0043] By applying this utility model, safety protection can be provided for pouch lithium-ion batteries, enabling the battery cells to maintain shape stability when subjected to external pressure, effectively preventing deformation and damage to the battery cells, thereby protecting the internal electrodes, separators and other structures of the battery cells from damage, and ensuring the performance and safety of pouch lithium-ion batteries.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A soft-pack lithium-ion battery structure, characterized in that, include: Soft-pack battery cell (10), side tape (20), grooved tape (30), protection plate (40), battery cell protective frame (60), steel sheet (80), injection molded protective frame (90) and label sleeve (100); The hollow cell protective frame (60) has a soft-pack cell (10) and a protection plate (40) embedded in its inner cavity. The left and right sides of the cell protection frame (60) have openings; On the left and right sides of the soft-pack battery cell (10), a vertically distributed steel sheet (80) is fixedly installed. The protection board (40) is located directly above the soft-pack battery cell (10); The front and rear sides of the soft-pack battery cell (10) are respectively glued with a side tape (20). A grooved tape (30) is attached to the top left side of the soft-pack battery cell (10). The positive tab (101) and negative tab (102) at the top of the soft-pack battery cell (10) are electrically connected to the protection plate (40), respectively. A label sleeve (100) is provided around the outer circumference of the cell protective frame (60). A plastic injection protective frame (90) is provided in the gap between the overall structure consisting of the soft-pack battery cell (10) and the protection board (40) and the battery cell protective frame (60). The left and right sides of the cell protection frame (60) are correspondingly engaged with the two steel plates (80) located on the left and right sides of the soft-pack cell (10); The cell protection frame (60) includes a first slot (61) and three second slots (62); A first slot (61) is provided at the bottom left and right center of the top frame of the battery cell protective frame (60). Three equally spaced second slots (62) are provided on the top left and right sides of the bottom frame of the battery cell protective frame (60). The top of the steel sheet (80) is provided with a first snap-fit ​​protrusion (81) at a position corresponding to the first slot (61). The first snap-fit ​​protrusion (81) and the first snap-fit ​​groove (61) are engaged in a corresponding snap-fit ​​manner; At the bottom of the steel sheet (80), a second snap-fit ​​protrusion (82) is provided at a position corresponding to each second slot (62). The second snap-fit ​​protrusion (82) snaps into the second snap-fit ​​groove (62).

2. The pouch lithium-ion battery structure of claim 1, wherein, At the bottom ends of the protection plate (40), a positive electrode conductive sheet (41) and a negative electrode conductive sheet (42) are respectively provided. On the left and right sides of the protective plate (40), there are two snap-fit ​​protrusions (43) protruding outward respectively. The two snap-fit ​​protrusions (43) are symmetrically distributed front and back; The top of the protection plate (40) is provided with a positive output terminal (441) and a negative output terminal (442) spaced apart.

3. The pouch lithium-ion battery structure of claim 2, wherein, The cell protection frame (60) has a positive output end exposure window and a negative output end exposure window respectively at the positions corresponding to the positive output end and the negative output end on the top of the protection board (40).

4. The pouch lithium-ion battery structure of claim 2, wherein, The top edge of the cell protection frame (60) has a protrusion snap-fit ​​groove (65) at the position corresponding to each snap-fit ​​protrusion (43) on the protection plate (40). The snap-fit ​​protrusion (43) and the snap-fit ​​groove (65) are snap-fitted together.

5. The pouch lithium-ion battery structure of claim 1, wherein, The left and right sides of the soft-pack battery cell (10) are respectively bonded to a steel sheet (80); A strip of foam (50) is bonded between the top left side of the soft-pack battery cell (10) and the bottom of the protective plate (40).

6. The pouch lithium-ion battery structure of claim 1, wherein, The injection molding protective frame (90) is formed by injecting injection molding compound into the gap between the integral structure consisting of the soft-pack battery cell (10) and the protective plate (40) and the battery cell protective frame (60).

7. The pouch lithium-ion battery structure of any one of claims 1 to 6, wherein, For each steel sheet (80), a side protective strip (83) is provided at both its front and rear ends on the side facing the battery cell protective frame (60). The battery cell protective frame (60) has side protection strip receiving grooves (63) at positions corresponding to the side protection strips (83) on each steel sheet (80). The side guard strip (83) is located in the side guard strip receiving groove (63).

8. The pouch lithium-ion battery structure of claim 7, wherein, The side guard strip (83) and the side guard strip receiving groove (63) are engaged in a corresponding snap-fit.

9. The pouch lithium-ion battery structure of claim 7, wherein, Each side guard strip (83) has an adhesive injection notch (84) at its upper and lower ends. The side protective strip receiving groove (63) on one side of the cell protective rubber frame (60) has an injection inlet (64) at a position corresponding to the injection notch (84).

10. The pouch lithium-ion battery structure of any one of claims 1 to 9, wherein, The inner side of the label sleeve (100) is bonded to the outer surface of the battery cell protective frame (60).

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