TWM459532U - Cell housing and cell module thereof - Google Patents

Description

Battery case and battery module

The present invention relates to a battery case, and more particularly to a battery case and a battery module having a plastic film formed by In Mold Film (IMF) molding technology.

Considering the increasing environmental pollution and the depletion of the earth's resources, battery modules that can be repeatedly charged and discharged are often used as power sources; and thanks to the rapid development and advancement of the electronics industry, battery modules are not only in performance. The increase has been greatly improved, and the appearance is also changing with each passing day. The volume is evolving in a light, short, and small direction.

In the existing design, the battery module is usually composed of a casing (including upper and lower covers), a battery and a battery management circuit board; wherein the structural design of the casing is most common in plastic injection molding and metal embedded molding. The battery system is placed in the casing, and the battery management circuit board is mounted on the lower cover of the casing, and is electrically connected to the battery component through the connecting wire to manage charging and discharging of the battery component.

However, the plastic injection molded case is limited by the minimum thickness (about 0.4 to 0.8 mm) that can be ejected and the minimum wall thickness (about 0.4 to 0.8 mm) required for the UL safety fire protection V2 to V0 level, resulting in the inability to achieve thinning. the design of.

In addition, because the price of the thin metal parts is too high, and the thin metal parts are molded by plastic molding or ultrasonic fusion, an additional insulating material is needed to isolate the conductive, so that in addition to increasing the cost, there is also assembly. Disadvantages of complex, time-consuming and internal short-circuit risks; if metal thin parts and plastics are injection molded, the deformation of the shell may be too large due to the different shrinkage ratio of the thin metal parts and the plastic, which cannot meet the product requirements.

The reason is that this creator feels that the above-mentioned deficiencies can be improved. He has devoted himself to researching and cooperating with the use of academics, and finally proposed a creation that is reasonable in design and effective in improving the above-mentioned deficiencies.

The main purpose of the present invention is to solve the problem that the casing of the conventional battery module cannot be effectively thin and firm due to the limitation of the process, and the components of the two different materials have excessive deformation due to different shrinkage ratios. technical problem.

According to an embodiment of the present invention, the present invention provides a battery case including a frame and a plastic film, and the frame and the plastic film are integrally formed in an injection manner.

According to the above battery case, the present invention further provides a battery module, comprising a battery case, a battery holder, a circuit board and at least one battery component, wherein the battery case is integrally formed by a frame and a plastic film, the battery The circuit board is connected to the frame, and the circuit board is disposed in the battery holder. The battery component is disposed in the battery holder and electrically connected to the circuit board.

In summary, the battery case of the present invention is formed by inserting a molded plastic film into the mold for injection molding, and directly bonding the plastic film to the melted plastic, thereby utilizing the rigidity of the film itself to reinforce the strength of the casing. The plastic film can achieve the V0 grade characteristic at a thickness of 0.1 mm, so that the battery casing has the advantages of being thinned and effectively reducing the weight of the finished product.

Other objects and advantages of the present work can be further understood from the technical features disclosed in the present work. For the above and other purposes of this creation The features, advantages, and advantages will be more apparent and understood from the following detailed description of the embodiments.

The present invention mainly provides a battery module in which the outer casing is replaced by a plastic film by a plastic injection molding or a metal embedded molding, which is capable of conforming to a thin and firm design trend and meeting various decorative requirements. Hereinafter, a method of fabricating the battery module and specific structural features thereof will be described based on the respective drawings.

Please refer to FIG. 1 , which is a flow chart showing the manufacturing method of the battery module of the first embodiment of the present invention, and FIG. 2 to FIG. 6 are schematic diagrams showing the manufacturing process of the manufacturing method shown in FIG. 1 . In this embodiment, the manufacturing method of the battery module is divided into five steps of film printing, film cutting, film preheating molding, embedded shell molding, and battery module packaging.

Referring to FIG. 2 and step S10, first, a plastic film 121 is provided, and a printed pattern 122 is formed on the plastic film 121 by using ink. Since the present invention does not limit the aspect of the printed pattern 122 formed on the plastic film 121, The printed pattern 122 can also be replaced by a piece of text, so it is indicated here by a dashed box.

In this embodiment, the material of the plastic film 121 may be a transparent plastic such as polycarbonate (PC) or polyethylene terephthalate (PET), or other translucent or opaque plastic; the printed pattern 122 may be Printing, such as screen printing, gravure printing, lithography, letterpress printing, etc., for example, printing inks of different colors and concentrations (such as water-based ink or oil-based ink) on the plastic film 121 according to the desired pattern and pattern; Therefore, both the plastic film 121 and the ink must be able to withstand high temperatures to withstand subsequent embedding. The temperature of the plastic that is ejected in the molding step is injected in the mold. Further, the plastic film 121 is not limited to the above-mentioned transparent or translucent plastic, and the printing method is not limited to the above-described ink printing. In a variant embodiment, the plastic film 121 may be made of polyethylene terephthalate. Pure black plastic such as ester (PET).

Referring to FIGS. 3 and 4 and steps S12 and S14, the plastic film 121 on which the printed pattern 122 has been formed is cut by punching or the like, and the excess edge material is cut according to the shape of the mold and the product requirement; The cut plastic film 121 is placed on a molding die (not shown) for preheating to form a molding unit 12, which includes the cut plastic film 121 and thereon. The printing pattern 122; it can be understood that the molding method of the plastic film 121 is not limited thereto, and the film forming can be achieved by other methods such as stamping and hydraulic pressure.

Referring to FIG. 5 and step S16, the molding unit 12 is placed in an injection machine (not shown), and the molten plastic is injected to the other side of the molding unit 12 relative to the printing pattern 122 to form a battery. During the outer casing 10; the printed pattern 122 is located between the casing (not shown) and the plastic film 121, so that the printed pattern 122 formed by the ink can be protected by the plastic film 121; in the embodiment, the injection plastic can be Polyurethane (abbreviated as PU), acrylonitrile-butadiene-styrene (abbreviated as ABS), polycarbonate (abbreviated as PC), nylon (referred to as Nylon) or acrylic.

It is worth mentioning that the present invention allows the plastic film 121 to be directly injected with the melted plastic by placing the molded plastic film 121 into the mold, thereby simplifying the production steps and assembly time, and reducing the time. The use of plastic and the reduction of the thickness of the battery casing 10 are more in line with the trend of thin and firm design; in addition, the frame 11 joined to the plastic film 121 has a tough rigidity even in a partially hollowed out or fully hollowed structure, plastic film 121 can achieve UL safety and fire protection V0 level at 0.1 mm.

In addition, it should be noted that the manufacturing method of the battery case 10 is not limited to the first performing the in-mold film (IMF) molding step, and then the plastic injection molding step is performed; the battery casing 10 can also be manufactured first. After performing the plastic injection molding step, the in-mold film (IMF) molding step is performed, so that the battery case (especially the upper cover of the battery module) integrally formed by the injection method is the scope of the present creation.

In addition, if the battery casing 10 manufactured through the above steps has defects such as uneven surface of the plastic film 121 and poor structural strength of the frame 11, the step S15 is performed to adjust the process parameters, and then the step S14 is repeated. And step S16, that is, steps S15, S14, and S16 are repeatedly performed in sequence until the appearance and strength of the battery case 10 meet the product requirements.

Referring to FIG. 6 and step S18, finally, the packaging process of the battery module 1 is performed, including the following steps. First, a battery holder 13 matching the battery casing 10 is provided, that is, the shape of the battery holder 13 is based on the battery. The frame 11 of the outer casing 10 is designed, and the two can be fixed to each other by a snap-fit structure (not shown) or fixedly combined by a locker (for example, a screw).

Further, the battery holder 13 is made of an insulating material (for example, ABS plastic material) to ensure the insulation of the battery module 1, and the battery holder 13 is extended from a bottom wall and a bottom wall. Side wall The structure is formed to surround and form a receiving cavity (not shown) for accommodating the circuit board 14 and the at least one battery component 15.

Secondly, the specification of the battery assembly 15 is ensured on the basis of ensuring the shape and size of the battery case 10 and the battery holder 13, for example, the capacity and voltage after the battery assembly 15 is configured to determine the configuration of the battery assembly 15 in the same specification. The quantity can be used to ensure the accuracy of the configuration; in the embodiment, a glue layer 16 is further disposed between the battery holder 13 and the battery assembly 15, which may be formed by a bonding agent such as glass glue or double-sided tape. The fixing between the battery holder 13 and the battery pack 15 is made closer.

Thirdly, the circuit board 14 is fixed in the battery holder 13 and electrically connected to the battery assembly 15, so that the package of the battery module 1 is completed; in the embodiment, the circuit board 14 is fixed to the battery holder. The bottom wall of the 13 is spaced apart from the battery assembly 15.

Referring to FIG. 6 and FIG. 7 , FIG. 6 is a perspective exploded view of the battery module of the first embodiment of the present invention, and FIG. 7 is a cross-sectional view of the battery module according to the first embodiment of the present invention; The battery module 1 includes a battery case 10, a battery holder 13, a circuit board 14, and at least one battery assembly 15. The battery case 10 is a frame 11 and a plastic film 121. The battery frame 13 is connected to the frame 11 , and the circuit board 14 is disposed in the battery holder 13 . At least one battery component 15 is disposed in the battery holder 13 and electrically connected to the circuit board 14 .

Specifically, the frame 11 of the battery case 10 has two end faces 111 and a plurality of side faces 112 between the end faces 111. The plastic film 121 is joined to one of the end faces 111 and a part of the side faces 112; In detail, the plastic film 121 is completely attached to one end surface of the frame 11 and extends downward from the boundary between the end surface and the side surfaces to fit on the side surfaces 112 or completely conform to the plastic film 121. The side surface 112 reduces the chance of the plastic film 121 falling off and the efficiency of production, assembly and stock preparation.

In a variant embodiment, the plastic film 121 has a glossy surface and a matte surface (or rough surface), and the matte surface of the plastic film 121 is bonded to the frame 11 to increase the bonding force between the plastic film 121 and the frame 11; Alternatively, the plastic film 121 may have two glossy surfaces and two matte surfaces, and at least one matte side of the plastic film 121 is bonded to the frame 11.

[Second embodiment]

Please refer to FIG. 8 , which is a schematic cross-sectional view of a battery module according to a second embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the frame 11 of the battery casing 10 has a plurality of positioning structures. The number and position of the positioning structures are not limited; for example, the positioning structures may be symmetrically disposed on the frame 11, or the positioning structures may be staggered on the frame 11.

Specifically, the positioning structures are the indentation grooves 113 recessed inwardly by the end surface 111 of the frame 11, and the plastic film 121 has a plurality of convex portions 123 extending outwardly from the wall surface, and the convex portions are formed. The portion 123 is correspondingly embedded and fixed to the limiting slots 113 to further increase the bonding force between the plastic film 121 and the frame 11; accordingly, the plastic film 121 does not need to be coupled to the side surface 112 of the frame 11 to Increase the bond between the two.

It should be noted that the positioning structure of the creation frame 11 is not limited thereto, and the positioning structures may also be an end surface 111 of the frame 11. An outwardly extending shaped protrusion (not shown), the plastic film 121 has a plurality of concave portions recessed inwardly from the wall surface, and the concave portions respectively closely cover the convex portions to further increase the plastic The bonding force between the film 121 and the frame 11; therefore, the addition of the positioning structure on the plastic frame to increase the bonding force between the plastic frame 11 (hard material) and the plastic film 121 (soft material) falls into the creation of the present invention. category.

It is added that the creation of the soft and hard material between the plastic film 121 and the plastic frame 11 can achieve a good waterproof effect.

[Effect of the example]

1. The battery casing of the present invention is injection molded by placing the formed plastic film into the mold, so that the plastic film is directly combined with the molten plastic, thereby simplifying the production steps and assembling the component time, and also reducing the use of the plastic and lowering the battery. The thickness of the outer casing is able to meet the trend of thin and sturdy design.

2. As described above, the frame joined to the plastic film has strong rigidity even in a partially hollowed out or fully hollowed structure, and the appearance of the plastic film is flat and not easily contaminated, and the UL safety fireproof V0 can be achieved at 0.1 mm. The characteristics of the level.

3. The battery casing can achieve the effect of good waterproof effect through the close cooperation of soft and hard materials between the plastic film and the plastic frame.

4. The battery casing has high elasticity, so it can meet the diversified decorative requirements in appearance.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the equivalents of the present invention are intended to be included within the scope of the present invention.

1‧‧‧ battery module

10‧‧‧ battery case

11‧‧‧Frame

111‧‧‧ end face

112‧‧‧ side

113‧‧‧ Limit slot

12‧‧‧Molding unit

121‧‧‧ plastic film

122‧‧‧Printed pattern

123‧‧‧ convex

13‧‧‧ battery holder

14‧‧‧ boards

15‧‧‧Battery components

16‧‧‧ glue layer

1 is a schematic flow chart of a method for fabricating a battery module according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a process for fabricating a method for fabricating a battery module according to a first embodiment; FIG. FIG. 4 is a schematic diagram of a process for fabricating a battery module according to the first embodiment of the present invention; FIG. FIG. 6 is a perspective exploded view of the battery module of the first embodiment; FIG. 7 is a first embodiment of the creation of the battery module of the first embodiment; FIG. A schematic cross-sectional view of a battery module; and FIG. 8 is a schematic cross-sectional view of the battery module of the second embodiment of the present invention.

1‧‧‧ battery module

10‧‧‧ battery case

11‧‧‧Frame

111‧‧‧ end face

112‧‧‧ side

12‧‧‧Molding unit

121‧‧‧ plastic film

13‧‧‧ battery holder

14‧‧‧ boards

15‧‧‧Battery components

16‧‧‧ glue layer

Claims (10)

A battery module comprising: a battery case integrally formed by a frame and a plastic film; a battery holder connected to the frame; a circuit board disposed in the battery holder; and at least one battery component disposed at The battery holder is electrically connected to the circuit board. The battery module of claim 1, wherein the frame has a plurality of positioning structures, and the plastic film is bonded to the positioning structures. The battery module of claim 2, wherein the positioning structures are a plurality of limiting slots, and the plastic film has a plurality of convex portions, and the convex portions are respectively embedded and fixed to the limiting slots. The battery module of claim 2, wherein the positioning structures are a plurality of bumps, the plastic film has a plurality of recesses, and the recesses respectively tightly cover the bumps. The battery module according to claim 1, wherein the frame has two end faces and a plurality of sides between the end faces, and the plastic film is joined to one of the two end faces and a part of the side faces. The battery module of claim 1, wherein the plastic film has at least one glossy surface and at least one matte surface, and at least one matte side of the plastic film is bonded to the frame. A battery casing characterized by comprising a frame and a plastic film, and the frame and the plastic film are integrally formed in an injection manner. The battery casing of claim 7, wherein the frame has a plurality of positioning structures, and the plastic film is joined to the positioning structures. The battery casing of claim 7, wherein the frame has There are two end faces and a plurality of sides between the end faces, and the plastic film is joined to one of the two end faces and a part of the side faces. The battery casing of claim 7, wherein the plastic film has at least one glossy surface and at least one matte surface, and at least one matte side of the plastic film is bonded to the frame.