CN115122889A - Battery package mounting structure, battery package and car - Google Patents

Abstract

The invention discloses a battery pack mounting structure, a battery pack and an automobile. The battery pack mounting structure provided by the invention avoids friction between the battery pack framework and the vehicle body mounting joint, ensures the strength of the battery pack framework and prolongs the service life.

Description

A battery pack installation structure, battery pack and automobile

technical field

The invention belongs to the technical field of automobiles, and specifically refers to a battery pack installation structure, a battery pack and an automobile.

Background technique

Pure electric vehicles use power battery packs and motors to drive power. It does not generate exhaust gas when it works, and does not emit exhaust pollution, which is very beneficial to environmental protection and air cleanliness. It can be said that it is almost "zero pollution". Electric vehicles are cheap to use, only about one-fifth that of gasoline vehicles. Moreover, the energy conversion efficiency is high, and at the same time, the energy during braking and downhill can be recovered, and the utilization efficiency of energy is improved.

However, due to factors such as heavy body weight and low battery energy density, pure electric vehicles have shortcomings such as "range anxiety", and the short mileage of electric vehicles has become a pain point for more and more users. At present, the main methods to solve the problem of "range anxiety" of electric vehicles are: reducing the weight of the body and making the body structure lighter; promoting the progress of battery technology and improving the energy density of the battery; lightweighting the structure of the battery pack and reducing the weight of the battery pack structure.

Carbon fiber composite materials have high specific stiffness and specific strength characteristics. Carbon fiber composite battery packs can effectively reduce the weight of the battery pack structure by more than 60%, improve the energy density of the battery pack, and effectively increase the range of electric vehicles. However, the carbon fiber composite material itself has low hardness and poor wear resistance. When the carbon fiber composite material battery pack structure is connected with the metal body structure, there is a problem of friction damage.

Publication number CN109435663A (application number CN201811284465) Chinese invention patent application discloses a composite material battery pack vehicle body mounting point structure. The glue is attached to the installation point of the battery pack. During the use of the electric vehicle, it is necessary to destructively remove the glue layer during regular maintenance and disassembly. The metal parts cannot be reused, and the convenience of maintenance and replacement requirements are not considered.

At present, the battery pack of electric vehicles generally adopts metal structure. When it is installed on the body, the mounting point is directly in contact with the body mounting joint. The hardness of the battery pack material is consistent with the hardness of the body mounting point, which is compatible with each other and is not easy to wear. However, due to the low hardness of carbon fiber composite battery packs, when they are in direct contact with the body mounting joints of the steel structure, if there is movement between each other, it will cause wear and damage to the battery pack, resulting in a reduction in structural strength and affecting the structure. completeness.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the background technology, and provide a battery pack mounting structure, a battery pack and a vehicle, which avoids friction between the battery pack frame and the vehicle body mounting joint and ensures the strength of the battery pack frame , improve the service life.

In order to achieve the above purpose, a battery pack installation structure designed by the present invention includes a battery pack skeleton made of carbon fiber material, and a transition gasket is arranged between the battery pack skeleton and the vehicle body mounting joint. The sheet includes an elastic part and a rigid part, the outer ring of the rigid part is embedded in the elastic part, and the inner ring of the rigid part protrudes from the elastic part.

In the above technical solution, the battery pack skeleton and the vehicle body mounting joint are provided with a connecting piece, and the connecting piece locks the battery pack skeleton and the vehicle body mounting joint through the locking piece;

The transition gasket is sleeved on the connecting member rod portion between the battery pack frame and the vehicle body mounting joint and/or the locking member.

In the above technical solution, the battery pack skeleton includes a casing, the casing is filled with a foam sandwich layer, and the connecting member vertically penetrates the casing and the foam sandwich layer.

In the above technical solution, an inner bushing is sleeved on the connecting piece, and the inner bushing has an inner sleeve and a first end plate arranged at one end of the inner sleeve, and the first end plate is connected to the battery pack. A transition spacer is arranged between the skeletons.

In the above technical solution, the inner liner jacket is provided with an outer liner, the outer liner has an outer sleeve and a second end plate arranged at one end of the outer sleeve, the second end plate is connected to the battery pack skeleton. There are transition spacers in between.

In the above technical solution, the inner bushing and the outer bushing are rigid members made of metal materials, and the inner ring of the elastic portion of the transition gasket is in abutment with the inner bushing and/or the outer bushing.

In the above technical solution, the outer wall of the inner bushing has an inner thread, the inner wall of the outer bushing has an outer thread matching the inner thread, and the first end plate and the first end plate are threadedly fitted with the outer bushing. The two end plates are respectively located at both ends of the axial direction.

In the above technical solution, the middle part of the transition gasket is provided with a mounting through hole; the battery pack skeleton is provided with a number of through holes along its periphery, and the vehicle body mounting joint is provided with mounting holes corresponding to the through holes. .

The present invention also provides a battery pack, comprising a plurality of the above-mentioned battery pack mounting structures.

The present invention also provides an automobile, comprising a vehicle body on which the above-mentioned battery pack is mounted.

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

First, the battery pack mounting structure of the present invention is provided with a transition gasket between the battery pack frame and the vehicle body mounting joint, which avoids friction between the battery pack frame and the vehicle body mounting joint, and ensures the strength of the battery pack frame. , improve the service life.

Second, the battery pack installation structure of the present invention satisfies all the stress requirements during the use of the electric vehicle, ensures the safety and reliability of installation, facilitates maintenance and disassembly, and has low cost.

Thirdly, the battery pack installation structure of the present invention has a small number of structural parts and a light structure, and has a good lightweight advantage. Standardized parts, high interchangeability of parts at each mounting point, and low cost.

Fourth, the battery pack installation structure of the present invention does not require destructive disassembly during maintenance, which ensures the integrity of the structure, and the parts of each installation point can be interchanged, which saves maintenance time and reduces maintenance costs.

Description of drawings

1 is a schematic three-dimensional structure diagram of a battery pack installation structure in this embodiment;

FIG. 2 is a cross-sectional structural schematic diagram of the battery pack installation structure shown in FIG. 1;

Fig. 3 is the enlarged structural schematic diagram of the transition gasket in Fig. 2;

4 is a schematic structural diagram of a battery pack in this embodiment;

In the figure: 1-battery pack skeleton, 1.1-shell, 1.2-foam sandwich layer, 2-body mounting joint, 3-transition gasket, 3.1-elastic part, 3.2-rigid part, 3.3-installation through hole, 4-connecting piece, 5-locking piece, 6-inner bushing, 6.1-inner sleeve, 6.2-first end plate, 7-outer bushing, 7.1-outer sleeve, 7.2-second end plate, 8 -Through holes, 9-mounting holes.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIGS. 1 and 2 , a battery pack installation structure of this embodiment includes a battery pack frame 1 , a transition gasket 3 is arranged between the battery pack frame 1 and the vehicle body mounting joint 2 , and the battery pack frame 1 is made of carbon fiber material, the vehicle body mounting joint 2 is made of metal material. As shown in Figure 3, the transition gasket 3 includes an elastic part 3.1 and a rigid part 3.2, the outer ring of the rigid part 3.2 is embedded in the elastic part 3.1, the inner ring of the rigid part 3.2 protrudes from the elastic part 3.1, and the The middle part is provided with a through hole 3.3 for the connecting piece to pass through. In this embodiment, the elastic part 3.1 is made of rubber material, and the rigid part 3.2 is made of metal material (such as stainless steel). According to the existing vulcanization process, the rigid part 3.2 and the elastic part 3.1 are vulcanized to form the transition gasket 3 , to avoid the problem of tightening torque attenuation during the use of the rigid part 3.2, and to ensure reliable connection. The rigid part 3.2 accounts for 1/4-1/2 of the thickness of the entire transition gasket 3, and the preferred thickness ratio is 1/3. The inner ring of the rigid part 3.2 protrudes from the elastic part 3.1, and the inner diameter of the rigid part 3.2 is slightly smaller than the inner diameter of the elastic part 3.1, which can ensure the convenience of disassembly. As the main body of the battery pack, the battery pack skeleton bears the force of the internal battery module and the load conditions during use. It is made of carbon fiber composite material, which has high strength, long fatigue life, corrosion resistance, light weight, etc. At the same time, the entire transition gasket 3 effectively separates the metal structure and the carbon fiber structure, avoids the friction between the metal structure and the carbon fiber structure, and solves the problem of poor wear resistance of the carbon fiber composite material.

电池包骨架1与车体安装接头2之间设置有一个过渡垫片3，电池包骨架1与锁紧件5之间设置有另一个过渡垫片3。In the above technical solution, the battery pack skeleton 1 and the vehicle body mounting joint 2 are provided with a connecting piece 4 (such as a bolt), and the connecting piece 4 connects the battery pack skeleton 1 and the vehicle body mounting joint 2 through a locking piece 5 (such as a nut). Locking; the battery pack skeleton 1 includes a shell 1.1, the shell 1.1 is filled with a foam sandwich layer 1.2, the connector 4 vertically penetrates the shell 1.1 and the foam sandwich layer 1.2, and the foam sandwich 1.2 is PMI foam or PET foam. In order to ensure the reliability and safety of the connection, the strength level of the bolt is not less than 10.9, the strength level of the nut is not less than 8.8, and the diameter of the bolt is not less than 10.9.

A transition gasket 3 is arranged between the battery pack frame 1 and the vehicle body mounting joint 2 , and another transition pad 3 is arranged between the battery pack frame 1 and the locking member 5 .

In the above technical solution, an inner bushing 6 is sleeved on the connector 4, and the inner bushing 6 has an inner sleeve 6.1 and a first end plate 6.2 arranged at one end of the inner sleeve 6.1. The first end plate 6.2 is connected to the battery. A transition spacer 3 is arranged between the package skeletons 1 . The inner bushing 6 is covered with an outer bushing 7. The outer bushing 7 has an outer sleeve 7.1 and a second end plate 7.2 arranged at one end of the outer sleeve 7.1. The second end plate 7.2 is arranged between the battery pack skeleton 1 There are transition spacers 3.

In the above technical solution, the inner bushing 6 and the outer bushing 7 are rigid members made of metal materials, and the inner ring of the elastic portion 3.1 of the transition gasket 3 abuts the inner bushing 6 and/or the outer bushing 7 . The inner bushing 6 and the outer bushing 7 are connected to the battery pack skeleton 1 through the transition gasket 3. During use, there is no sliding or friction in the middle, which solves the problem of poor wear resistance of the carbon fiber composite material of the battery pack skeleton 1 and meets the needs of electric motors. The vibration and friction requirements during the use of the car make the friction between the transition gasket 3, the inner bushing 6 and the outer bushing 7 and the bolts, nuts, and body mounting joints to ensure the safety of the carbon fiber composite battery pack. sexual requirements. The outer wall of the inner bushing 6 has an inner thread, and the inner wall of the outer bushing 7 has an outer thread that matches the inner thread. After the inner bushing 6 and the outer bushing 7 are threadedly fitted, the first end plate 6.2 and the second end plate 7.2 respectively Axial ends.

In the above technical solution, the battery pack skeleton 1 is provided with a plurality of through holes 8 along its periphery, and the vehicle body mounting joint 2 is provided with mounting holes 9 corresponding to the through holes 8 . One end of the car body mounting joint is installed with the car body, and the other end is connected with the inner bushing 6 and the outer bushing 7 by bolts, so as to ensure that friction such as the bolts exists between the metal parts and meet the wear resistance requirements of the entire battery pack. The vehicle body mounting joint needs to support the weight of the entire battery pack, so the material strength is not less than 340MPa. The vehicle body mounting joint is provided with a mounting hole 9, and its aperture size and position are consistent with the hole in the inner bushing. The outer bushing 7 is interfered with the through hole 8 to ensure that the walls of the holes do not slide during use. The reliability and disassembly of the sleeve connection are convenient for disassembly during subsequent maintenance. The metal inner and outer bushings are in direct contact with the battery pack skeleton 1 through the transition gasket 3. In order to avoid electrochemical reaction, the material is made of stainless steel.

The assembling method of the battery pack installation structure of the present invention:

A through hole 8 is made on the battery pack frame 1 as required, the transition gasket 3 is placed on the upper surface of the battery pack frame 1 according to the hole position, and the outer bushing 7 with internal thread is inserted into the through hole 8 from the top; another The transition gasket 3 is inserted into the inner bushing 6 with external threads, and the small end of the inner bushing 6 with external threads is screwed into the outer bushing 7 until the specified tightening torque is reached, thus forming the entire battery pack assembly. Lift the battery pack assembly to the bottom of the vehicle body, so that the top surface of the outer bushing 7 is aligned with the lower surface of the vehicle body mounting joint 2, and the inner circular hole of the inner bushing 6 is aligned with the circular hole of the vehicle body mounting joint 2. At this time, insert the bolt into the mounting hole from the top, and screw the nut onto the bolt at the bottom until the required tightening torque is reached. So far, the installation of the entire carbon fiber composite battery pack body mounting structure is completed. When maintenance is required, the disassembly process of the carbon fiber composite material battery pack body mounting structure is opposite to the installation process.

To sum up, the carbon fiber composite material battery pack vehicle body installation structure of the present invention has the advantages of simple parts, strong interchangeability, strong disassembly, compact product structure, low parts weight, low product cost, high structural strength, and long fatigue life. To improve the safety of the battery pack.

The above are only specific embodiments of the present invention. It should be pointed out that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall be included in the protection scope of the present invention. Inside, the rest that are not described in detail are prior art.

Claims (10)

1. A battery pack mounting structure includes a battery pack frame (1) made of a carbon fiber material, characterized in that: be provided with transition gasket (3) between battery package skeleton (1) and automobile body erection joint (2), transition gasket (3) include elasticity portion (3.1) and rigidity portion (3.2), the outer lane of rigidity portion (3.2) is inlayed and is put in elasticity portion (3.1), the inner circle of rigidity portion (3.2) stretches out elasticity portion (3.1).

2. The battery pack mounting structure according to claim 1, wherein: a connecting piece (4) penetrates through the battery pack framework (1) and the vehicle body mounting joint (2), and the battery pack framework (1) and the vehicle body mounting joint (2) are locked by the connecting piece (4) through a locking piece (5);

transition gasket (3) cover is established on connecting piece (4) pole portion between battery package skeleton (1) and automobile body erection joint (2) and/or retaining member (5).

3. The battery pack mounting structure according to claim 2, wherein: the battery pack framework (1) comprises a shell (1.1), a foam sandwich layer (1.2) is filled in the shell (1.1), and the connecting piece (4) vertically penetrates through the shell (1.1) and the foam sandwich layer (1.2).

4. The battery pack mounting structure according to claim 3, wherein: an inner bushing (6) is sleeved on the connecting piece (4), the inner bushing (6) is provided with an inner sleeve (6.1) and a first end plate (6.2) arranged at one end of the inner sleeve (6.1), and a transition gasket (3) is arranged between the first end plate (6.2) and the battery pack framework (1).

5. The battery pack mounting structure according to claim 4, wherein: an outer bushing (7) is sleeved outside the inner bushing (6), the outer bushing (7) is provided with an outer sleeve (7.1) and a second end plate (7.2) arranged at one end of the outer sleeve (7.1), and a transition gasket (3) is arranged between the second end plate (7.2) and the battery pack framework (1).

6. The battery pack mounting structure according to claim 5, wherein: the inner lining (6) and the outer lining (7) are rigid members made of metal materials, and the inner ring of the elastic part (3.1) of the transition gasket (3) is abutted to the inner lining (6) and/or the outer lining (7).

7. The battery pack mounting structure according to claim 6, wherein: the outer wall of the inner bushing (6) is provided with internal threads, the inner wall of the outer bushing (7) is provided with external threads matched with the internal threads, and the first end plate (6.2) and the second end plate (7.2) are respectively positioned at two axial ends after the inner bushing (6) and the outer bushing (7) are sleeved in a threaded mode.

8. The battery pack mounting structure according to any one of claims 1 to 7, wherein: the middle part of the transition gasket (3) is provided with a mounting through hole (3.3); battery package skeleton (1) is gone up and has been seted up a plurality of clearing hole (8) along its periphery, be provided with mounting hole (9) that correspond with clearing hole (8) on automobile body erection joint (2).

9. A battery pack, comprising: a battery pack mounting structure comprising a plurality of battery packs according to any one of claims 1 to 7.

10. An automobile, characterized in that: comprising a vehicle body on which the battery pack of claim 9 is mounted.

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