CN216127780U - Composite battery upper cover and battery case - Google Patents

Abstract

The utility model discloses a composite battery upper cover which comprises a cover body, wherein the cover body is provided with an opening, a cover edge protruding outwards is arranged around the opening, the cover body is composed of a first prepreg layer, and the cover edge is composed of a first prepreg layer and a second electronic cloth layer. The utility model also discloses a battery shell which comprises a battery shell and the battery upper cover. The utility model improves the surface quality of the battery upper cover and has good product sealing performance.

Description

Composite battery upper cover and battery case

Technical Field

The utility model belongs to the field of composite material forming processes, and particularly relates to an upper cover of a composite battery and a battery shell.

Background

Prepreg (preprg) is a Prepreg sheet product made by impregnating Matrix (Matrix) in reinforcing Fiber (Reinforced Fiber), is an intermediate material of composite material, is an important type of composite material semi-finished product, and has been developed rapidly in recent years. The composite material prepared by the prepreg has light weight and high strength, simplifies the part manufacturing process, reduces the part processing and assembling processes, reduces the production cost, improves the product reliability, reduces the maintenance cost, reduces the life cycle cost, and can realize light weight on the premise of meeting the material performance requirements. Therefore, the prepreg is widely applied to the industries of automobile engineering, rail transit, building materials, aerospace and the like.

The new energy automobile is an industry which is greatly promoted in China at present. At present, most of the upper covers of new energy vehicles adopt sheet metal parts and SMC materials, and with the gradual improvement of the requirements on light weight, the wall thickness of the upper covers of batteries produced by prepreg composite materials can reach 0.9mm, so that the light weight target has great advantages.

The compression molding process of the prepreg composite material is a method for putting a certain amount of fiber prepreg into a metal matched mold and curing a molded product under the action of certain temperature and pressure. The prepreg is a prepreg sheet product prepared by soaking a matrix in reinforcing fibers, the prepreg prepared by adopting the mesh cloth fibers has extremely high strength and can realize the purpose of light weight of the product, but the problems of ineffective sealing performance, material shortage of the product, abnormal appearance and the like of the product are caused by the problem that sand holes are easy to appear in the forming process of the mesh cloth prepreg, and the qualification rate of the product can be greatly reduced. The electronic cloth is a generic name of electronic grade glass fiber cloth used in the electronic industry, is a high-grade product in the electronic grade glass fiber cloth, and can be fully fused with a prepreg made of grid cloth fibers.

The existing prepreg new energy automobile battery upper cover is made of heavy prepreg, the problems of sand holes, pits and air leakage easily occur in the production process of local surface quality, the product is poor, the product forming repair rate is 90%, and meanwhile, the risk of assembly air leakage exists in the local position during installation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems, and provides a composite battery upper cover with improved surface quality, so that the surface quality of the battery upper cover is improved, and the sealing performance of a product is good.

In order to achieve the above object, the present invention provides a composite battery upper cover, which includes a cover body having an opening and a cover rim protruding outward along a periphery of the opening, the cover body being composed of a first prepreg layer, and the cover rim being composed of a first prepreg layer and a second electronic fabric layer.

According to the composite battery upper cover of the present invention, preferably, the first prepreg layer has a first strength, and the second electronic fabric layer has a second strength, and the first strength is different from the second strength. More preferably, the second intensity is greater than the first intensity.

According to the composite battery upper cover of the utility model, preferably, the cover edge is a flange edge for connecting the battery upper cover and the battery shell.

According to the upper cover of the composite battery, a plurality of mounting holes are preferably arranged on the edge of the cover.

According to the composite battery upper cover disclosed by the utility model, preferably, the second electronic cloth layer is positioned on one side of the cover edge, which is connected with the battery shell.

In another aspect, the utility model further provides a battery shell, which comprises a battery shell and the battery upper cover.

The utility model applies the electronic cloth to the upper cover of the new energy automobile battery for the first time to improve the appearance surface quality of the product, the technology can effectively improve the problems of sand holes, pits and air leakage of local surface quality, the repair rate is reduced from 90 percent to 30 percent, the repair cost is greatly reduced, the production benefit is improved, the mass production application of the electronic cloth to the production of the upper cover of the new energy automobile battery is realized,

the product has a simple structure and good sealing performance, the combination of the manufacturability and the sealing performance of the battery cover product is realized through the process technology of producing the electronic cloth composite prepreg, the surface quality and the sealing performance qualified rate of the battery cover can be greatly improved, the flame retardance of the upper cover of the battery can be improved, and the battery cover can be used in other high-flame-retardance fields.

Drawings

Fig. 1 is a schematic structural diagram of a mold used in a method for improving the surface quality of a battery upper cover by adopting electronic cloth composite prepreg molding.

Fig. 2 is a schematic structural view of an upper cover of a composite battery according to the present invention.

Fig. 3 is a schematic sectional view of the upper cover of the composite battery according to the present invention.

Detailed Description

The present invention will be further described with reference to the following examples. It should be understood that the following examples are illustrative of the present invention only, and are not intended to limit the scope of the present invention.

Examples

Fig. 1 shows a schematic structural diagram of a mold used in a method for improving the surface quality of a battery upper cover by using electronic cloth composite prepreg molding.

The method for improving the surface quality of the battery upper cover comprises the following steps:

(1) laying the prepreg in the whole lining of the mould;

(2) placing an electronic cloth at a local position of the prepreg;

(3) and starting a press to mold and carrying out compression molding operation, wherein the compression molding operation comprises continuous first-stage compression molding and second-stage compression molding, and the first-stage compression molding parameters are as follows: the mould pressing pressure is 20-50T, and the pressure maintaining time is 15-60 seconds; the second-stage compression molding parameters are as follows: the mould pressing pressure is 160-; the mold closing speed is 5-10 mm/s; the temperature of the die is as follows: the upper die is 153-163 ℃ and the lower die is 155-165 ℃.

(4) Opening the mold and taking out the product.

As shown in fig. 1, the press mold used in the method comprises a lower mold 1 and an upper mold 2, wherein the upper mold 2 is electrically connected with a press control panel 5, and related press molding parameters (including press molding pressure, press molding time, pressure maintaining time, press molding speed and the like) can be input through the press control panel 5, and the press molding process is realized by controlling the pressing action of the upper mold 2. The press may be any co-die press commonly used in the art. For the sake of simplicity and clarity, other parts of the press are not shown in fig. 1, however, it will be understood by those skilled in the art that the press may include other parts, including but not limited to brackets, actuating mechanisms, etc., in addition to the upper die 2, the lower die 1 and the press control panel 5 shown in fig. 1, and the connections between the parts and the upper die 2, the lower die 1 and the press control panel 5 are well known.

When compression molding spreading material, adopt preimpregnation material as the main part, can take the preimpregnation material of the different size specifications that cut according to actual need and fully spread on the inside lining, ensure that the material fully spreads whole inside lining. According to the appearance surface quality analysis, the local poor surface quality positions of the product are subjected to electronic cloth compounding for reinforcement, the local poor surface quality positions can be as shown in figure 1, and the paving size can be 990 mm × 50mm and 660 mm × 50mm, but can also be adjusted according to actual conditions.

The prepreg used in the present invention is a composition of a resin matrix and a reinforcement prepared by impregnating a continuous fiber or fabric with the resin matrix, and may be any prepreg commonly used in the art and suitable for the preparation of battery covers. For example, prepregs useful in the present invention are made from glass fibres impregnated with 30 to 45% by weight of epoxy resin to 55 to 70% by weight.

The electronic cloth used in the utility model is a general name of electronic grade glass fiber cloth used in the electronic industry, has main specifications of 7628, 7625, 1506, 2116, 1080, 1086, 1078, 1067, 1526, 1035, 106, 104 and the like, and is mainly used for manufacturing copper clad laminates. The electronic cloth suitable for the present invention may be any electronic cloth known in the art, and may have a thickness of 12 μm to 254 μm, preferably 150 μm, and may have a size of, for example, 1m by 100 m.

When the mold is closed, the mold closing speed is 5-10 mm/s (most preferably 8 mm/s); the temperature of the die is as follows: 153-163 ℃ of the upper die (most preferably 158 ℃) and 155-165 ℃ of the lower die (most preferably 160 ℃). During the first stage molding, the molding pressure is 20 to 50T (most preferably 50T), the dwell time is 15 to 60 seconds (most preferably 45 seconds), and the electronic cloth material and the prepreg can be melted and sufficiently fused. During the second-stage compression molding, the compression molding pressure is 160-240T (most preferably 240T), and the pressure holding time is 240-480 second (most preferably 480 second), under the conditions, the fused prepreg and the electronic cloth can be further cured, combined and molded, and the prepreg and the electronic cloth are fully combined to form a composite material with good strength, so that the surface quality of the product is improved.

The product has locally enhanced strength, and is particularly suitable for the battery upper cover of a new energy automobile, including but not limited to a part for connecting the edge of the battery upper cover, such as a flange area (as shown in fig. 2) at the periphery of an opening, wherein the flange area can effectively improve the sealing performance and the surface strength of the product. The area for adding the electronic cloth to increase strength may be any product location that is intended to be enhanced.

Fig. 2 is a schematic structural view of a composite battery upper cover according to an embodiment of the present invention. Fig. 3 is a schematic sectional view of the battery upper cover. As shown in fig. 2 and 3, the composite battery upper cover includes a cover 6, the cover 6 has an opening 7, and a cover rim 8 protruding outward is provided around the opening 7. The cover body 6 is composed of a first prepreg layer 9 with first strength, the cover edge 8 is formed by laminating the first prepreg layer 9 with first strength and a second electronic cloth layer 10 with second strength, and the first strength is different from the second strength. The second intensity may be greater than the first intensity and vice versa. The cover rim 8 may be a flange edge for connecting the battery top cover to the battery housing, and a plurality of mounting holes (see fig. 2) are formed therein to stably connect the battery top cover to the battery housing.

As shown in fig. 3, a second layer 10, such as an electronic cloth, is preferably located on the side of the lid rim 8 that is connected to the battery housing, i.e., the underside as shown, which is opposite the top side of the lid on the battery.

The utility model also provides a battery shell which comprises a battery shell and the battery upper cover.

After the upper cover of the electric vehicle battery manufactured by the method of the embodiment is mounted on the battery shell, the upper cover of the electric vehicle battery is manufactured according to the national standard GB/T31467.3-2015 lithium ion power storage battery pack system part 3 for electric vehicles: safety requirements and test methods, for which airtightness testing is carried out. A cell top cover (comparative example 3) made from the same prepreg (without electronic cloth) alone by compression molding was used as a control. The results of the measurements are shown in table 1 below.

TABLE 1

Claims (7)

1. The composite battery upper cover is characterized in that the cover body is composed of a first prepreg layer, and the cover edge is composed of a first prepreg layer and a second electronic fabric layer.

2. The composite battery cover as defined in claim 1, wherein the first prepreg layer has a first strength and the second electronic cloth layer has a second strength, the first strength being different from the second strength.

3. The composite battery cover as defined in claim 2, wherein the second strength is greater than the first strength.

4. The composite battery cover according to claim 1, wherein the cover rim is a flange edge for connecting the battery cover to a battery case.

5. The composite battery cover as defined in claim 1, wherein the cover edge is provided with a plurality of mounting holes.

6. The composite battery cover as defined in claim 1, wherein the second electronic cloth layer is located on a side of the cover edge connected to the battery case.

7. A battery case comprising a battery case, characterized by further comprising the battery upper cover according to any one of claims 1 to 6.

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