CN114024075A - Novel carbon fiber power battery upper shell and power battery thereof - Google Patents

Abstract

The invention provides a novel carbon fiber power battery upper shell and a power battery thereof, wherein the upper shell comprises a main surface area, a reinforcing area and a main sealing surface area which adopt a carbon fiber composite board, and the carbon fiber composite board comprises a carbon fiber composite layer and an insulating layer; the carbon fiber composite layer comprises a plurality of carbon fiber woven cloth layers. The carbon fiber power battery manufactured by the invention can ensure that no open fire is generated on the surface of the battery for 30min at 1500 ℃. The heat diffusion can be effectively resisted, the safety of a battery system is guaranteed, and meanwhile, the light weight is realized, and the high customer value is achieved.

Description

Novel carbon fiber power battery upper shell and power battery thereof

Technical Field

The invention mainly relates to a power battery, in particular to a novel carbon fiber power battery upper shell and a power battery thereof.

Background

In the safety requirement of a power storage battery for an electric automobile (GB 38031-. This requirement is considered to be fulfilled if the thermal diffusion does not create a situation that would cause danger to the vehicle occupants. When a single battery is thermally out of control to cause heat diffusion, a battery system can generate a large amount of high-temperature and high-pressure jet, and great challenges are brought to protection of the battery system. In order to meet the regulatory requirements of the battery pack, protective measures are generally required to be added to the upper shell, which increases the cost, weight and difficulty of the manufacturing process.

The power battery system contains various electronic control elements to ensure normal operation without being interfered by external complex electromagnetic radiation; meanwhile, when the internal electronic equipment normally operates, the electromagnetic interference generated to the environment cannot exceed a certain limit; the power battery shell is required to have good electromagnetic shielding performance. The power battery of the electric automobile belongs to a high-voltage system, and in order to prevent safety accidents caused by overlarge potential difference, equipotential connection is required to be used as a basic requirement for high-voltage electric shock protection for a metal shell.

The current mainstream technical routes of the battery pack upper shell comprise several types:

1. the aluminum alloy upper shell has the advantages that the light weight effect is good, and a compact oxide film can be formed on the surface of the aluminum alloy without additional anticorrosion measures. However, the aluminum alloy has a low melting point of about 660 ℃, and is poor in high temperature resistance, and when the battery module is subjected to thermal diffusion, the generated high-temperature and high-pressure gas is easy to break through the aluminum alloy shell, thereby threatening the safety of members and failing to pass the national standard.

2. The low-carbon steel upper cover has the advantages that the stamping process is mature, and the size is easy to control; the melting point of the low-carbon steel is about 1500 ℃, and the thermal shock of module thermal diffusion can be effectively resisted. However, the low-carbon steel stamping upper shell has the weight about 3 times that of aluminum alloy, and the lightweight effect is poor; an electrophoretic paint, PVC, is required for additional corrosion protection. Meanwhile, the electrophoretic paint can generate spontaneous combustion at high temperature, so that an additional sprayed flame-retardant material is needed. The whole process is complex, the cost is high and the weight is heavy.

3. The traditional non-metallic material upper shell and SMC composite material have the advantages of wide application, good insulating property and aging resistance. However, as one of the glass fiber reinforced plastic materials, the material itself is not conductive, and additional measures such as laying an aluminum film are required to meet the functional requirements of electromagnetic compatibility and equipotential. Meanwhile, SMC has poor high temperature resistance, cannot resist the thermal diffusion impact of the module, and can realize the thermal diffusion fireproof function only by additional fireproof measures.

Disclosure of Invention

It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure.

The invention aims to provide a novel carbon fiber power battery upper shell and a power battery thereof.

In order to solve the technical problem, the invention provides a novel upper shell of a carbon fiber power battery, which is characterized in that,

the upper shell comprises a main surface area, a reinforcing area and a main sealing surface area which adopt carbon fiber composite plates, and each carbon fiber composite plate comprises a carbon fiber composite layer and an insulating layer;

the carbon fiber composite layer comprises a plurality of carbon fiber woven cloth layers.

Preferably, the invention further provides a novel carbon fiber power battery upper shell, which is characterized in that,

the main surface area and the reinforcing area are distributed at intervals on the upper shell, and the main sealing surface area is positioned on the side edge of the upper shell.

Preferably, the invention further provides a novel carbon fiber power battery upper shell, which is characterized in that,

the main surface region and the main sealing region further comprise a shielding net and a fire-proof layer which are respectively positioned on two sides of the carbon fiber composite layer.

Preferably, the invention further provides a novel carbon fiber power battery upper shell, which is characterized in that,

the number of the carbon fiber woven cloth layers in the reinforcing area is more than that in the main surface area and the main sealing surface area.

Preferably, the invention further provides a novel carbon fiber power battery upper shell, which is characterized in that,

the carbon fiber composite layer includes:

the first carbon fiber weaved cloth layer has the fiber direction of 0 degree/90 degree and the thickness of 0.45mm plus or minus 0.5 mm;

the second carbon fiber woven fabric layer has a fiber direction of +/-45 degrees and a thickness of 0.45mm +/-0.5 mm;

the third carbon fiber weaved cloth layer has the fiber direction of plus or minus 45 degrees and the thickness of 0.28mm plus or minus 0.5 mm;

the fourth carbon fiber weaved cloth layer has the fiber direction of +/-45 degrees and the thickness of 0.45mm of +/-0.5 mm;

a fifth carbon fiber weaved cloth layer, the fiber direction is 0 degree/90 degree, the thickness is 0.45mm plus or minus 0.5 mm;

the first to fifth carbon fiber woven cloth layers are cured and formed by epoxy resin materials, and the tolerance range is +/-15 degrees.

Preferably, the invention further provides a novel carbon fiber power battery upper shell, which is characterized in that,

the carbon fiber composite layer in the main surface area comprises a first carbon fiber woven cloth layer, a third carbon fiber woven cloth layer and a fifth carbon fiber woven cloth layer;

the carbon fiber composite layer of the reinforced area comprises first to fifth carbon fiber woven cloth layers;

the carbon fiber composite layer in the main sealing surface area comprises second to fifth carbon fiber woven cloth layers.

The invention also provides a novel carbon fiber power battery, which comprises any one of the upper shell and is characterized in that the power battery further comprises:

the lower shell is arranged below the upper shell and forms an integrated structure with the upper shell through a plurality of connecting units.

Preferably, the invention further provides a novel carbon fiber power battery, which is characterized in that the power battery further comprises:

and the sealing strip is arranged at the joint of the main sealing surface area of the upper shell and the lower shell.

Preferably, the invention further provides a novel carbon fiber power battery, which is characterized in that the sealing strip comprises a foamed polyurethane material.

Preferably, the invention further provides a novel carbon fiber power battery which is characterized in that,

the connecting unit comprises a flow drill screw for fastening at the position of the sealing strip and a standard connecting piece connected through an opening at the position of the reinforced area.

Compared with the prior art, the invention has the following advantages: the carbon fiber power battery adopting the upper shell can ensure that no open fire is generated on the surface of the battery for 30min at 1500 ℃. Therefore, the heat diffusion can be effectively resisted, the safety of the battery system is ensured, and meanwhile, the light weight is realized, so that the battery system has high customer value.

Drawings

Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Further, although the terms used in the present disclosure are selected from publicly known and used terms, some of the terms mentioned in the specification of the present disclosure may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present disclosure is understood, not simply by the actual terms used but by the meaning of each term lying within.

The above and other objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the present invention with reference to the accompanying drawings.

FIG. 1 is an exploded schematic view of a carbon fiber composite layer constituting an upper case of the present invention;

fig. 2(a) and 2(b) are a schematic plan view and an enlarged partial view of an edge portion of the upper case, respectively;

FIG. 3 is a cross-sectional view of the upper housing when combined with the lower housing;

fig. 4 is a schematic view of the combination of the upper and lower housings by means of the connecting member.

Reference numerals

100-upper case

101-shielding net

102-carbon fiber composite layer

103-fireproof layer

104-insulating layer

111-main surface region

112-reinforced area

113-main sealing surface region

200-lower casing

300-connection unit

301-flow drill screw

302-standard connector

400-sealing strip

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

Flow charts are used herein to illustrate operations performed by systems according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, various steps may be processed in reverse order or simultaneously. Meanwhile, other operations are added to or removed from these processes.

Fig. 1 shows an exploded view of the carbon fiber composite sheet constituting the upper case of the present invention.

The carbon fiber composite board comprises a metal copper shielding net 101 for electromagnetic shielding from top to bottom, and the thickness of the metal copper shielding net is 0.08 mm; the carbon fiber composite layer 102, the carbon fiber composite layer 102 includes a plurality of carbon fiber woven cloth layers with different parameters.

In a preferred embodiment, the carbon fiber woven fabric layer of the carbon fiber composite layer 102 sequentially has:

the thickness of the first carbon fiber woven fabric layer in the fiber direction is 0.45mm at 0 degree/90 degree;

the second carbon fiber woven fabric layer is 0.45mm thick at +/-45 degrees in the fiber direction;

the third carbon fiber weaved cloth layer has the thickness of 0.28mm at the fiber direction of +/-45 degrees;

the fourth carbon fiber weaved cloth layer has the thickness of 0.45mm at the fiber direction of +/-45 degrees;

and the fifth carbon fiber woven fabric layer has the thickness of 0.45mm at the fiber direction of 0 degree/90 degree.

The carbon fiber composite layer 102 is formed by compounding a plurality of carbon fiber woven fabrics, the performance is better along the fiber direction, and the fiber direction is not ideal and is easy to break when being vertical to the fiber direction)

A fire-resistant layer 103 is used under the carbon fiber composite layer 102, which enhances the expansion effect and has a thickness of 0.3 mm.

The bottom surface of the fire-proof layer 103 is an insulating layer 104, and the thickness of the fiber direction is 0 degree/90 degree and is 0.1mm by utilizing the insulating property of the glass fiber woven cloth;

and all the layers of the carbon fiber woven cloth layer are cured and molded by epoxy resin materials, and the tolerance range is +/-15 degrees.

In the composition of the carbon fiber composite board, the shielding net 101 is an electromagnetic shielding metal copper net, so that electromagnetic shielding can be effectively realized. The power battery system is ensured to contain various electronic control elements and is not interfered by external complex electromagnetic radiation; meanwhile, when the internal electronic equipment normally operates, the electromagnetic disturbance generated to the environment does not exceed a certain limit, and the equal potential of the upper shell and the lower shell is realized; the insulating layer 104 is made of woven glass fiber cloth, and the insulating property of the glass fiber is utilized to prevent high-voltage electric arc generated between the module and the upper shell from striking through the upper shell when heat diffusion occurs. The fire-proof felt adopted by the fire-proof layer 103 is a unique expansion material, the expanding agent is a graphite-based product stabilized by mineral fibers, and the graphite-based product has the characteristic of thermal expansion, can form a high-efficiency fire-proof barrier and simultaneously has excellent insulating property for protecting an underlying structure. Effectively isolating high-temperature substances.

Table 1 shows the parameters and properties of the layers of the carbon fiber composite panel in a preferred embodiment:

TABLE 1

In order to achieve maximum light weight, a specific paved structure is required.

Please refer to fig. 2 further. Fig. 2(a) and 2(b) respectively show a schematic plan view and an enlarged schematic partial edge portion of the upper case.

The overall structure of the present invention is designed using a thickness variation structure, and on the plane illustrated in fig. 2(a), the upper case 100 is divided into three regions, which are: a major surface region 111, a reinforcement region 112, and a major sealing surface region 113.

The total thickness of the main surface region 111 was 1.68mm, and consisted of the first, second, fourth, sixth, seventh, and eighth layers in table 1; the total thickness of the reinforced region 112 was 2.58mm, consisting of the first, second, third, fourth, fifth, sixth, seventh, and eighth layers in table 1; the total thickness of the primary sealing surface region 113 was 2.28mm and consisted of the third, fourth, fifth, sixth, and eighth layers in table 1.

In a preferred embodiment, the thickness of each layer is within a range of + -0.5 mm.

The design considerations are that the primary face region 111 is used for overall structural strength and stiffness, so the third and fifth carbon fiber woven cloth layers in the composite layer 102 are omitted, and the reinforcement region 112 is used for reinforcing the link fixing points to ensure sufficient strength, so that all carbon fiber layers are used, and the primary sealing face region 113 has no requirement for fire resistance due to the requirement for a sealing structure. The first and second carbon fiber woven cloth layers and the fire-proof layer 103 are omitted.

The thickness of the reinforced area 112 in the three areas of the upper shell formed in the way is the largest and reaches 2.1mm, and the requirements on strength and rigidity are ensured.

Table 2 gives the specific parameters and properties of each region in a preferred embodiment:

carbon fiber material

Linear density of	780-820(g/km)
		Density of	1.78-1.82g/cm3
Tensile strength	≥4500Mpa
		Modulus of elasticity in tension	230-260Gpa
Elongation at break	≥1.7％
		Containing glue	1.0-1.2％

Flame-retardant resin

Fire-proof layer

Areal density	g/m2
		Density of	180kg/m3
Thickness of	0.3mm
		Expansion ratio	10∶1(at 450℃)
Excitation temperature	Activation Temperature：＞220℃

Electromagnetic shielding copper mesh

Areal density	240g/m2
		Thickness of	0.08mm
Toughness of	180°Spread and folded 8 timesWithout web breaks

TABLE 2

Fig. 3 illustrates a partial sectional view when the upper case 100 is combined with the lower case 200.

The upper case 100 is integrally sealed with the lower case 200 at the reinforcing region 112 at the edge thereof by a sealing tape 400.

In a preferred embodiment, the sealing strip 400 is made of a single-component foamed polyurethane material, and the sealing strip 400 is bonded to the upper housing 100 through baking, foaming and hardening by a surface activation process of a carbon fiber composite material.

The sealing tape 400, as a whole with the upper case 100, has an advantage of being reusable, compared to the conventional adhesive sealing. Meanwhile, the upper shell 100 is provided with a limiting structure, and the effective secret seal compression amount is larger than 50%.

Fig. 4 is an exploded view of the carbon fiber power battery according to the present invention, and more particularly, to an exploded view of the upper and lower cases 100 and 200 fixed by a plurality of connection units 300.

M5 flow drilling screws 301 are adopted to fasten the positions of the sealing strips 400 on the connecting periphery of the upper shell 100 and the lower shell 200, the lower shell 200 does not need to be perforated in advance, and the problem of dislocation of the upper shell and the lower shell or holes is effectively avoided.

In consideration of the rigidity of the upper case 100, the screw pitch is 70mm in order to secure the sealing performance.

In the preferred embodiment, M5 standard connectors 302 and M24 standard connectors 302 are used for the middle region of the upper and lower housings. The M24 standard connecting piece is of a hollow structure, and a vehicle body connecting bolt is allowed to penetrate through a vehicle body fixing point from the middle, so that the safety of the whole vehicle is improved. The middle connecting point is reinforced by a metal embedded part, and the upper shell and the lower shell are conducted at the same time.

The carbon fiber power battery with the structure can ensure that no open fire is generated on the surface of the carbon fiber power battery for 30min at 1500 ℃ through bench test verification. Therefore, the heat diffusion can be effectively resisted, the safety of the battery system is ensured, and meanwhile, the light weight is realized, so that the battery system has high customer value.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the foregoing embodiments are merely illustrative of the present application and that various changes and substitutions of equivalents may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above-described embodiments that come within the spirit of the application fall within the scope of the claims of the application.

Claims (10)

1. A novel upper shell of a carbon fiber power battery is characterized in that,

the upper shell comprises a main surface area, a reinforcing area and a main sealing surface area which adopt carbon fiber composite plates, and each carbon fiber composite plate comprises a carbon fiber composite layer and an insulating layer;

the carbon fiber composite layer comprises a plurality of carbon fiber woven cloth layers.

2. The novel carbon fiber power battery upper shell according to claim 1,

the main surface area and the reinforcing area are distributed at intervals on the upper shell, and the main sealing surface area is positioned on the side edge of the upper shell.

3. The novel carbon fiber power battery upper shell according to claim 2,

the main surface region and the main sealing region further comprise a shielding net and a fire-proof layer which are respectively positioned on two sides of the carbon fiber composite layer.

4. The novel carbon fiber power battery upper shell according to claim 3,

the number of the carbon fiber woven cloth layers in the reinforcing area is more than that in the main surface area and the main sealing surface area.

5. The novel carbon fiber power cell upper casing of claim 4, wherein the carbon fiber composite layer comprises:

the first carbon fiber weaved cloth layer has the fiber direction of 0 degree/90 degree and the thickness of 0.45mm plus or minus 0.5 mm;

the second carbon fiber woven fabric layer has a fiber direction of +/-45 degrees and a thickness of 0.45mm +/-0.5 mm;

the third carbon fiber weaved cloth layer has the fiber direction of plus or minus 45 degrees and the thickness of 0.28mm plus or minus 0.5 mm;

the fourth carbon fiber weaved cloth layer has the fiber direction of +/-45 degrees and the thickness of 0.45mm of +/-0.5 mm;

a fifth carbon fiber weaved cloth layer, the fiber direction is 0 degree/90 degree, the thickness is 0.45mm plus or minus 0.5 mm;

the first to fifth carbon fiber woven cloth layers are cured and formed by epoxy resin materials, and the tolerance range is +/-15 degrees.

6. The novel carbon fiber power battery upper shell according to claim 5,

the carbon fiber composite layer in the main surface area comprises a first carbon fiber woven cloth layer, a third carbon fiber woven cloth layer and a fifth carbon fiber woven cloth layer;

the carbon fiber composite layer of the reinforced area comprises first to fifth carbon fiber woven cloth layers;

the carbon fiber composite layer in the main sealing surface area comprises second to fifth carbon fiber woven cloth layers.

7. A novel carbon fiber power cell comprising the upper case of any one of claims 1 to 6, wherein the power cell further comprises:

the lower shell is arranged below the upper shell and forms an integrated structure with the upper shell through a plurality of connecting units.

8. The novel carbon fiber power cell as claimed in claim 7, wherein the power cell further comprises:

and the sealing strip is arranged at the joint of the main sealing surface area of the upper shell and the lower shell.

9. The novel carbon fiber power cell according to claim 8,

the sealing strip comprises a foamed polyurethane material.

10. The novel carbon fiber power cell according to claim 9,

the connecting unit comprises a flow drill screw for fastening at the position of the sealing strip and a standard connecting piece connected through an opening at the position of the reinforced area.

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