CN115207533A

CN115207533A - Equipotential carbon fiber composite battery box and automobile

Info

Publication number: CN115207533A
Application number: CN201910598835.4A
Authority: CN
Inventors: 邢俊亚; 吴杰余; 高祥达; 熊芬; 李停停; 黄立
Original assignee: Kangde Composites Co ltd; Dongfeng Motor Corp
Current assignee: Kangde Composites Co ltd; Dongfeng Motor Corp
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2022-10-18
Anticipated expiration: 2039-07-04
Also published as: CN115207533B

Abstract

The invention discloses an equipotential carbon fiber composite battery box and an automobile, wherein the battery box comprises a lower shell, a module mounting plate for mounting a battery module and a conductor connected with an automobile body; the module mounting plate is connected with a conductive mounting assembly, a first conductive part is arranged on the module mounting plate, a second conductive part is arranged on the lower shell, and a conductive path is formed among the conductive mounting assembly, the first conductive part, the second conductive part and the conductor. The battery box body adopts good conductors to form a conductive path, meets the requirement of equipotential, avoids the risk of electric leakage of the battery pack, and ensures the electrical property and the use safety of the battery pack.

Description

Equipotential carbon fiber composite battery box and automobile

Technical Field

The invention belongs to the technical field of automobiles, and particularly relates to an equipotential carbon fiber composite battery box and an automobile.

Background

The pure electric vehicle adopts the power battery pack and the motor to drive power, does not generate waste gas and exhaust tail gas pollution when working, is very beneficial to environmental protection and air cleaning, and can be said to be almost zero pollution. The electric automobile has low use cost, which is about one fifth of gasoline automobile. And the energy conversion efficiency is high, and meanwhile, the energy during braking and downhill can be recycled, so that the utilization efficiency of the energy is improved.

However, the pure electric vehicle has the disadvantages of 'mileage anxiety' due to factors such as heavy vehicle body weight and low battery energy density, and the electric vehicle with shorter mileage becomes a pain point for more and more users. The current methods for solving the problem of mileage anxiety of the electric automobile mainly comprise the following steps: the weight of the vehicle body is reduced, and the vehicle body structure is light; the technical progress of the battery is promoted, and the energy density of the battery is improved; the battery package structure is lightweight, reduces battery package structure weight.

The carbon fiber composite material has high specific strength and specific modulus, and the weight of a battery pack produced by the carbon fiber composite material is reduced by more than 60% compared with a steel structure battery pack and is reduced by more than 30% compared with an aluminum alloy structure battery pack, so that the adoption of the carbon fiber composite material is one of the main ways for reducing the weight of the battery pack.

Carbon-fibre composite is the bad conductor of electricity, because the inside battery module of battery package is high voltage power supply, has the risk of leaking, consequently at battery package installation, transportation, the in-process of using, has the risk of "electric leakage", leads to the injury to personnel. In order to avoid the injury to personnel, consequently need carry out equipotential design to carbon-fibre composite battery package, in case module "electric leakage", can be quick lead away the electric current.

Disclosure of Invention

The invention aims to overcome the defects in the background technology and provide an equipotential carbon fiber composite battery box body and an automobile.

In order to achieve the purpose, the invention designs an equipotential carbon fiber composite battery box, which comprises a lower shell, a module mounting plate and a conductor, wherein the module mounting plate is used for mounting a battery module, and the conductor is connected with a vehicle body;

the module mounting plate is connected with a conductive mounting assembly, a first conductive part is arranged on the module mounting plate, a second conductive part is arranged on the lower shell, and a conductive path is formed among the conductive mounting assembly, the first conductive part, the second conductive part and the conductor.

In the technical scheme, the conductor can be selected from iron parts for grounding, commonly called iron lapping pieces. The conductive mounting assembly is used for connecting and fixing the battery module.

Among the above-mentioned technical scheme, the lateral wall of module mounting panel bonds through the structure glue film with the inner wall laminating department of casing down.

Among the above-mentioned technical scheme, electrically conductive installation component includes the current conducting plate, sets up mounting nut and fastening bolt on the current conducting plate, the current conducting plate passes through the glue film and bonds with the bottom surface of module mounting panel, the battery module passes through fastening bolt and mounting nut fixed connection.

In the above technical scheme, a first metal fastener is installed between the module mounting plate and the conductive mounting component, and the first metal fastener is used for electric conduction between the conductive mounting component and the first conductive part.

In the above technical scheme, a second metal fastener is installed between the module installation plate and the lower housing, and the second metal fastener is used for electric conduction between the first conductive part and the second conductive part.

In the above technical solution, the conductor is mounted on the second conductive part of the lower case through a metal mounting.

In the technical scheme, the metal mounting part comprises a rivet nut and a mounting bolt, the rivet nut is embedded on the second conductive part of the lower shell, one end of the conductor is fixedly connected with the rivet nut through the mounting bolt, and the other end of the conductor is connected with the vehicle body.

In the technical scheme, the module mounting plate is made of carbon fiber composite materials and comprises a mounting bottom plate and a mounting side plate, a plurality of first mounting holes for mounting first metal fasteners and fastening bolts are formed in the mounting bottom plate, and second mounting holes for mounting second metal fasteners are formed in the mounting side plate; the first conductive part is arranged on the lower surface of the first mounting hole of the module mounting plate and extends towards two sides until the first conductive part covers the second mounting hole of the mounting side plate;

the lower shell is provided with a first mounting hole for embedding a rivet nut, a second mounting hole for mounting a second metal fastener is formed in the inner wall of the lower shell, and a second conductive part is arranged on the lower surface of the lower shell and extends towards two sides to extend through the first mounting hole and then cover the first mounting hole.

In the technical scheme, the lower shell is made of carbon fiber composite materials and comprises a bottom plate, thickened side walls are arranged on the periphery of the bottom plate, and foam sandwich cores are filled in the thickened side walls.

The invention also provides an automobile which comprises a frame, wherein the equipotential carbon fiber composite battery box body is arranged on the frame.

Compared with the prior art, the invention has the following advantages:

firstly, the battery box body adopts the conductive mounting assembly, the first conductive part, the second conductive part and the conductor as good conductors to form a conductive path, so that the requirement of equipotential is met, the risk of electric leakage of the battery pack is avoided, and the electrical property and the use safety of the battery pack are ensured.

Secondly, the main body bearing part of the battery box body is made of carbon fiber composite materials, so that the battery box body is light in structural weight and has a good light weight advantage; compare metal construction battery package, it is higher to subtract heavy efficiency, has the advantage of integrating the design simultaneously, can reduce spare part number in a large number, has saved input such as metal construction battery package mould, frock, has effectively reduced investment cost.

Thirdly, the lower shell is of a local foam sandwich structure, thickened side walls are arranged on the periphery of the lower shell, foam sandwich is filled in the thickened side walls, the middle part of the lower shell is of a single-plate structure, the foam sandwich structure has high rigidity and strength, and the foam sandwich is adopted on the periphery, so that the extrusion resistance and the impact resistance of the battery pack are improved.

Drawings

FIG. 1 is a schematic view of a disassembled structure of a carbon fiber composite battery case of the present invention;

FIG. 2 is a schematic cross-sectional view of a carbon fiber composite battery case according to the present invention;

FIG. 3 is a schematic view of the conductive mounting assembly of the present invention;

in the figure: 1-lower shell, 2-module mounting plate, 3-conductor, 4-conductive mounting component, 4.1-conductive plate, 4.2-mounting nut, 4.3-fastening bolt, 5-first conductive part, 6-second conductive part, 7-structural adhesive layer, 8-adhesive layer, 9-first metal fastener, 10-second metal fastener, 11-metal mounting part, 11.1-rivet nut, 11.2-mounting bolt, 12.1-first mounting hole, 12.2-second mounting hole, 12.3-third mounting hole, 12.4-fourth mounting hole and 13-foam sandwich core.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

An equipotential carbon fiber composite battery box as shown in fig. 1 includes a lower case 1, a module mounting plate 2 for mounting a battery module, and a conductor 3 connected to a vehicle body. Lower casing 1 and module mounting panel 2 are made by carbon-fibre composite, have that structural weight is lighter, have excellent corrosion protection ability, and acid, alkali, tide ability are stronger, need not spray paint completely, pollutant emission when avoiding spraying paint. The fatigue life is longer, the product replacement and maintenance period is longer, and the cost of the whole life cycle can be effectively reduced. The outer side wall of the module mounting plate 2 is bonded with the inner wall joint of the lower shell 1 through a structural adhesive layer 7 to form a lower tray of the battery pack, and the lower tray bears the stress of the whole battery pack.

As shown in fig. 2, a conductive mounting component 4 is connected to the module mounting plate 2, the battery module is mounted on the module mounting plate 2 through the conductive mounting component 4, a first conductive part 5 is disposed on the module mounting plate 2, a second conductive part 6 is disposed on the lower case 1, and a conductive path is formed among the conductive mounting component 4, the first conductive part 5, the second conductive part 6 and the conductor 3. The first conductive part 5 and the second conductive part 6 are made of a metal conductive material, and in this embodiment, a metal mesh is preferably used. Considering that the metal mesh needs to have better conductive property, the metal mesh is made of aluminum or copper with better conductive property, the preferred material is copper mesh, the copper mesh is 150g in unit area weight, 0.1mm in single-layer thickness and 200 meshes, and meanwhile, the manufacturability of HP-RTM is not affected by the increase of the copper mesh. The lower shell 1, the module mounting plate 2 and the metal mesh are formed by adopting an HP-RTM (high pressure-resin transfer molding) process, the mass production of the battery pack is guaranteed, the added metal mesh is used as one layer of a carbon fiber composite material, the whole forming process is not influenced, and the metal mesh and the carbon fiber are integrally formed, so that the cost is saved. In addition, the carbon fiber composite material can effectively resist damp heat and corrosion, and the characteristics of high specific strength and specific rigidity of the carbon fiber composite material are utilized, so that the stress is better, the cost is reduced, and the industrial application of the carbon fiber composite material battery pack is promoted. Like this, adopt the electrically conductive installation component 4 that has good electric conductivity on electrically conductive path, first conductive part 5, second conductive part 6 and conductor 3 form the electrically conductive path of whole battery package, satisfy the equipotential requirement of battery package in the position of whole battery package electrically conductive path, simultaneously through with lower casing 1 and module mounting panel 2 rational in infrastructure connection, reach the requirement of equipotential, keep the equipotential characteristic of battery package and metal automobile body, when the battery package takes place "electric leakage" the condition, in time lead away the electric current through the bonding wire, avoid the injury to the human body.

As shown in fig. 3, the conductive mounting assembly 4 comprises a conductive plate 4.1, a mounting nut 4.2 arranged on the conductive plate 4.1 and a fastening bolt 4.3, the conductive plate 4.1 is bonded with the bottom surface of the module mounting plate 2 through a glue layer 8, and the battery module is fixedly connected with the mounting nut 4.2 through the fastening bolt 4.3. In order to secure the reliability and safety of the installation of the battery module, it is preferable that the mounting nut 4.2 has a nut diameter of

The strength grade of the mounting nut 4.2 is not less than 8.8; the conductive plate 4.1 is made of metal materials, the strength is not lower than 340MPa, and the thickness is not lower than 1.5mm. In the use process of the battery pack, the force generated by the module due to vibration can be effectively resisted. Like this, module mounting panel 2 is connected with electrically conductive installation component 4, plays the effect that supports the battery module, bears battery module vibration vertical load, and the overload during collision waits load requirement, for the main stress component of battery package, utilizes carbon-fibre composite material anisotropic characteristics, arranges axial fibre in the direction of product atress many, mainly bears horizontal and longitudinal load.

A first metal fastening member 9 is mounted between the module mounting board 2 and the conductive mounting member 4, and the first metal fastening member 9 is used for electrical conduction between the conductive mounting member 4 and the first conductive part 5. A second metal fastening member 10 is mounted between the module mounting board 2 and the lower case 1, and the second metal fastening member 10 is used for electric conduction between the first conductive part 5 and the second conductive part 6. The first metal fastening piece 9 and the second metal fastening piece 10 not only play a role in fastening the battery pack, but also penetrate through the adhesive layer, the carbon fiber composite material and other poor conductors through the conductivity of the first metal fastening piece and the second metal fastening piece to connect the whole metal electric path. In order to maintain surface protection at the junction with the carbon fiber composite material and prevent corrosion from occurring, the metal fastener is made of stainless steel, preferably a blind rivet.

In the above-described embodiment, the conductor 3 is mounted on the second conductive portion 6 of the lower case 1 by the metal mounting 11, and the conductor 3 may be a bonding material. The metal mounting part 11 comprises a rivet nut 11.1 and a mounting bolt 11.2, the rivet nut 11.1 is embedded on the second conductive part 6 of the lower shell 1, one end of the conductor 3 is fixedly connected with the rivet nut 11.1 through the mounting bolt 11.2, and the other end of the conductor 3 is connected with a vehicle body. Thus, one end of the conductor 3 is connected to the area of the second conductive part 6, the other end of the conductor is connected with the metal car body, the equipotential characteristics of the battery pack and the metal car body are kept, and when the battery pack is in an electric leakage condition, current is conducted away through the bonding wire in time, so that the injury to a human body is avoided.

In the technical scheme, the module mounting plate 2 comprises a mounting bottom plate 2.1 and a mounting side plate 2.2, a plurality of first mounting holes 12.1 for mounting the first metal fasteners 9 and the fastening bolts 4.3 are formed in the mounting bottom plate 2.1, and second mounting holes 12.2 for mounting the second metal fasteners 10 are formed in the mounting side plate 2.2; the first conductive part 5 is arranged on the lower surface of the first mounting hole 12.1 of the module mounting plate 2 and extends towards two sides until covering the second mounting hole 12.2 of the mounting side plate 2.2; the lower surface layer of the module mounting plate 2 is paved with the first conductive part 5 in a local area to form a conductive path of the whole battery pack, and the equipotential requirement of the battery pack is met at the position of the conductive path of the whole battery pack. Third mounting holes 12.3 for embedding and mounting rivet nuts 11.1 are formed in side walls of two sides of the lower shell 1, fourth mounting holes 12.4 for mounting second metal fasteners 10 are formed in the inner wall of the lower shell 1, and the second conductive portion 6 is arranged on the lower surface of the lower shell 1 and extends towards two sides to extend through the third mounting holes 12.3 until the fourth mounting holes 12.4 are covered.

In the technical scheme, the lower shell 1 comprises a bottom plate 1.1, thickened side walls 1.2 are arranged around the bottom plate 1.1, and foam sandwich 13 is filled in the thickened side walls 1.2. The foam sandwich structure has higher rigidity and strength, and the foam sandwich is adopted on the periphery, so that the extrusion resistance and the impact resistance of the battery pack are improved; meanwhile, the foam sandwich area is provided with a connecting point connected with the car body, so that the reliability of the car body mounting point is improved. The carbon fiber composite material has the advantage of variable thickness design, and the part of the side wall which is stressed greatly is subjected to local thickening treatment to meet the stress requirement of the battery pack; the metal mesh is laid on the surface layer of the lower shell in a local area to form a conductive path of the whole battery pack, and the equipotential requirement of the battery pack is met.

The production process and the assembly process of the equipotential carbon fiber composite battery box body of the embodiment are as follows:

1) Placing the metal mesh on the surface of the carbon fiber cloth laying layer of the module mounting plate 2 according to the designed position, placing the metal mesh and the carbon fiber cloth laying layer together on a mold of the module mounting plate 2, forming the metal mesh by an HP-RTM (high pressure-resin transfer molding) process, and then cutting and drilling to form a module mounting plate 2 part;

2) Placing a metal net on the surface of the carbon fiber laying layer of the lower shell 1 according to the designed position, placing the metal net on a mold of the lower shell 1 together, forming the metal net by an HP-RTM (high pressure-resin transfer molding) process, and then cutting and drilling to form a part of the lower shell 1;

3) Welding the mounting nut 4.2 to the conductive plate 4.1 according to the designed position to form a conductive mounting assembly 4; bonding the conductive plate 4.1 to the module mounting plate 2 through a glue layer 8, and connecting the first conductive part 5 on the module mounting plate 2 and the conductive mounting assembly 4 through a first metal fastener 9 to form a conductive path;

4) The module mounting plate 2 with the first metal fastening piece 9 and the conductive mounting group 4 is glued to the lower shell through the structural glue layer 7, and the first conductive part 5 on the module mounting plate 2 is connected with the second conductive part 6 on the lower shell 1 through the second metal fastening piece 10 to form another conductive path;

5) Mounting a blind rivet nut 11.1 on the area with the second conductive part 6 on the lower shell 1, so that the blind rivet nut 11.1 and the second conductive part 6 form a conductive path;

6) And (3) connecting and installing the conductor 3 on the rivet nut 11.1 through the installation bolt 11.2, so that the conductor 3 and the second conductive part 6 form an electric path, and the whole electric path is formed and the whole equipotential carbon fiber composite battery pack is assembled.

When the battery module "leaks electricity", the whole transmission path of electricity is: the battery module → the mounting nut 4.2 → the conductive plate 4.1 → the first metal fastener 9 → the first conductive part 5 → the second metal fastener 10 → the second conductive part 6 → the clinch nut 11.1 → the mounting bolt 11.2 → the conductor 3 → the metal car body, thereby avoiding injury to personnel.

The invention also provides an automobile which comprises a frame, wherein the equipotential carbon fiber composite battery box body is arranged on the frame, and the lower shell 1 is connected with the frame at the periphery by mechanical connection (such as screw connection or riveting).

The above description is only an embodiment of the present invention, and it should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are all included in the protection scope of the present invention, and the others that are not described in detail are the prior art.

Claims

1. The utility model provides a carbon-fibre composite battery box of equipotential which characterized in that: comprises a lower shell (1), a module mounting plate (2) for mounting a battery module, and a conductor (3) connected with a vehicle body;

be connected with electrically conductive installation component (4) on module mounting panel (2), be equipped with first conductive part (5) on module mounting panel (2), be equipped with second conductive part (6) on casing (1) down, form the electrically conductive route between electrically conductive installation component (4), first conductive part (5), second conductive part (6) and conductor (3).

2. The equipotential carbon fiber composite battery case of claim 1, further comprising: the outer side wall of the module mounting plate (2) is bonded with the inner wall joint of the lower shell (1) through a structural adhesive layer (7).

3. The equipotential carbon fiber composite battery case of claim 1 or 2, characterized in that: electrically conductive installation component (4) include current conducting plate (4.1), set up mounting nut (4.2) and fastening bolt (4.3) on current conducting plate (4.1), current conducting plate (4.1) bonds through the bottom surface of glue film (8) and module mounting panel (2), the battery module passes through fastening bolt (4.3) and mounting nut (4.2) fixed connection.

4. The equipotential carbon fiber composite battery cabinet of claim 3, wherein: a first metal fastener (9) is installed between the module installation plate (2) and the conductive installation component (4), and the first metal fastener (9) is used for electric conduction between the conductive installation component (4) and the first conductive part (5).

5. The equipotential carbon fiber composite battery case of claim 4, wherein: a second metal fastening piece (10) is installed between the module mounting plate (2) and the lower shell (1), and the second metal fastening piece (10) is used for electric conduction between the first conductive part (5) and the second conductive part (6).

6. The equipotential carbon fiber composite battery case of claim 5, wherein: the conductor (3) is mounted on the second conductive part (6) of the lower case (1) by a metal mounting member (11).

7. The equipotential carbon fiber composite battery case of claim 6, wherein: the metal mounting part (11) comprises a rivet nut (11.1) and a mounting bolt (11.2), the rivet nut (11.1) is embedded on a second conductive part (6) of the lower shell (1), one end of the conductor (3) is fixedly connected with the rivet nut (11.1) through the mounting bolt (11.2), and the other end of the conductor (3) is connected with a vehicle body.

8. The equipotential carbon fiber composite battery case of claim 7, wherein: the module mounting plate (2) is made of carbon fiber composite materials, the module mounting plate (2) comprises a mounting bottom plate (2.1) and mounting side plates (2.2), a plurality of first mounting holes (12.1) used for mounting first metal fasteners (9) and fastening bolts (4.3) are formed in the mounting bottom plate (2.1), and second mounting holes (12.2) used for mounting second metal fasteners (10) are formed in the mounting side plates (2.2); the first conductive part (5) is arranged on the lower surface of a first mounting hole (12.1) of the module mounting plate (2) and extends towards two sides until covering a second mounting hole (12.2) of the mounting side plate (2.2);

the lower shell (1) is provided with third mounting holes (12.3) used for embedding and mounting rivet nuts (11.1) on the side walls of the two sides, a fourth mounting hole (12.4) used for mounting a second metal fastener (10) is formed in the inner wall of the lower shell (1), and a second conductive part (6) is arranged on the lower surface of the lower shell (1) and extends towards the two sides to extend through the third mounting holes (12.3) and then to cover the fourth mounting holes (12.4).

9. The equipotential carbon fiber composite battery case of claim 1 or 2, characterized in that: the lower shell (1) is made of carbon fiber composite materials, the lower shell (1) comprises a bottom plate (1.1), thickened side walls (1.2) are arranged on the periphery of the bottom plate (1.1), and foam sandwich cores (13) are filled in the thickened side walls (1.2).

10. An automobile comprises a frame, and is characterized in that: the equipotential carbon fiber composite battery box body of any one of claims 1-9 is arranged on the frame.