CN217903299U

CN217903299U - Lower box body of battery box, battery pack and electric automobile

Info

Publication number: CN217903299U
Application number: CN202123456344.8U
Authority: CN
Inventors: 张建平; 黄春华; 于新瑞
Original assignee: Aulton New Energy Automotive Technology Co Ltd
Current assignee: Aulton New Energy Automotive Technology Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-31
Publication date: 2022-11-25
Anticipated expiration: 2031-12-31
Also published as: CN217956013U; CN217881776U; CN217280991U; CN116315293A; CN217281038U; WO2023116732A1; CN115312960A; CN115566344A; CN217281074U; CN217903275U; CN115566352A; CN217903298U; WO2023116733A1; CN219017854U; CN115295942A; CN217903297U; CN115312930A; WO2023116730A1; CN217281110U; CN115566337A

Abstract

The utility model provides a lower box, battery package and electric automobile of battery box, lower box is including stacking interior casing and the shell body of setting, the upper end edge of shell body is equipped with the recess, the upper end of interior casing be equipped with to the turn-ups that extends in the recess, the turn-ups with the recess cooperation is connected. The battery box adopts interior outer shell structure, is connected for utilizing turn-ups and recess cooperation to make interior casing detain the shell body in the edge, realizes the reinforced connection between interior outer shell, and the wholeness of reinforcing interior outer shell strengthens the intensity of box under the reinforcing under the circumstances of control gross weight to promote the bulk strength of box down.

Description

Lower box body of battery box, battery pack and electric automobile

This application claims priority to chinese patent application 202111567173.8, filed 2021, 12/month 20. The present application refers to the above-mentioned chinese patent application in its entirety.

Technical Field

The utility model relates to a lower box, battery package and electric automobile of battery box.

Background

An electric vehicle provides power using a battery pack placed in the electric vehicle. A battery pack generally includes a battery case, a battery module disposed in the battery case, and electrical components. The battery box is used for isolating the battery module and the electrical element from the external environment and protecting the battery module and the electrical element from collision.

At present, battery boxes on commercially available electric automobiles are all made of metal structural boxes, the metal structures are good in heat conducting performance and poor in heat insulation performance, and the heat insulation performance is usually improved by adding mica sheets, but the weight of the boxes is increased. The battery box needs to consider the strength factor while ensuring the heat preservation performance. On the premise of not obviously increasing the weight of the box body, how to ensure the heat preservation performance of the battery box and achieve the strength requirement is a difficult problem in the design of the current battery box.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a lower box, battery package and electric automobile of battery box for overcoming the poor defect of battery box thermal insulation performance that can open among the prior art.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

the utility model provides a lower box of battery box, it has upper end open-ended holding chamber to be used for with last case lid intercombination in order to form the battery box, lower box is including stacking interior casing and the shell body that sets up, the upper end edge of shell body is equipped with the recess, the upper end of interior casing be equipped with to the turn-ups that extends in the recess, the turn-ups with the recess cooperation is connected.

In this technical scheme, the lower box of battery box adopts inside and outside shell structure, can reduce the inside and outside heat-conduction of box, promotes the thermal insulation performance, and inside and outside two-layer structure also can increase the intensity of box down moreover. Utilize turn-ups and recess cooperation to be connected to make interior casing detain the shell body in the edge, realize the reinforced connection between interior and exterior casing, the wholeness of reinforcing interior and exterior casing strengthens the intensity of box under the circumstances of control gross weight to the bulk strength of box under the promotion.

Preferably, the flanging covers at least part of the inner surface of the groove in the extending direction of the flanging, and is attached to the inner surface of the groove.

In this technical scheme, with the inside surface laminating setting of turn-ups and recess, can make the two zonulae occludens, promote the connection wholeness of the two.

Preferably, the flanging at least covers the bottom surface inside the groove in the extending direction of the flanging.

In this technical scheme, when the turn-ups warp and lead to it to have and deviate from the trend, because the turn-ups has set up the bottom section that covers the inside bottom surface of recess, the deformation of recess can be kept out to the bottom section, has further strengthened the block intensity of turn-ups with the recess.

Preferably, the thickness of the bottom section of the turned edge covering the inner bottom surface of the groove is larger than the average thickness of the turned edge.

In the technical scheme, when the flanging has a separation tendency due to deformation, the bottom section covering the inner bottom surface of the groove can be subjected to larger extrusion force; the thickness of the bottom section of the flanging is increased, the deformation resistance of the bottom section can be enhanced, and the clamping strength of the flanging and the groove is further enhanced.

Preferably, the turned-over edge covers all the inner surfaces of the groove in the extending direction and continues to extend outwards towards the groove to form a protruding part, the protruding part is located on a combined surface between the upper box cover and the lower box body, and the protruding part is attached to the outer edge of the groove.

In the technical scheme, when the flanging covers the inner bottom surface of the groove in the extension direction and the flanging generates a deformation trend of falling out of the groove, the bottom section covering the inner bottom surface of the groove can be clamped in the groove under the action of the deformation trend, and the flanging can be prevented from falling out to a great extent; and the extension part is arranged on the combination surface between the upper box cover and the lower box body, and when the upper box cover and the lower box body are combined with each other, the extension part is clamped between the upper box cover and the lower box body, so that the inner shell body can be more tightly pressed on the outer shell body.

Preferably, the bottom surface of the inside of the groove is provided with in-groove reinforcing ribs at intervals along the length direction of the groove, and the bottom section covering the bottom surface of the inside of the groove is abutted against the in-groove reinforcing ribs.

In this technical scheme, through setting up the inslot strengthening rib in the recess, promoted the intensity of shell body at the groove, the recess of avoiding the shell body becomes the weak link of the intensity of box down.

Preferably, the transition of the inner surface of the flanging, which deviates from the groove, at the corner is smooth.

In this technical scheme, through above-mentioned structure, can avoid interior casing to produce stress concentration in turn-ups's edge.

Preferably, the groove is a sealing groove for accommodating a sealing strip for sealing the upper box cover and the lower box body.

In the technical scheme, when the groove is used as a sealing groove, the groove not only contains the flanging, but also contains the sealing strip; the groove has the function of connecting the inner shell and the outer shell, and also has the function of sealing the upper box cover and the lower box body; the outer shell only needs to be provided with one groove, and a sealing groove does not need to be additionally formed, so that the strength reduction of the outer shell caused by extra grooving of the outer shell is avoided.

Preferably, the thickness of the outer shell is not less than that of the inner shell, the outer peripheral surface of the outer shell extends outwards to form a side wall reinforcing structure, and the groove is formed in the upper end surface of the side wall reinforcing structure.

In the technical scheme, the overall thickness of the outer shell is ensured by arranging the side wall reinforcing structure, so that the outer shell can be used as a main stress component of the lower box body, and the strength of the lower box body can be ensured; the side wall reinforcing structure also provides a space for the arrangement of the groove.

Preferably, the outer circumferential surface of the side wall reinforcing structure is provided with a plurality of concave portions which are concave toward the outer circumferential surface of the outer shell.

In this technical scheme, through setting up the depressed part, when guaranteeing shell body intensity, still reduced the whole weight of battery box. In addition, light heat-insulating materials can be placed in the concave part, the heat-insulating performance of the lower box body is improved, the side wall reinforcing structure is covered and fixed with the connecting plate, and when the quick-change unit or the battery pack fixing unit connected with the automobile body is fixed, even if the light heat-insulating materials are not placed, the air in the concave part can also play a certain heat-insulating effect, and the heat-insulating performance of the lower box body is improved.

Preferably, the inner side surface or the outer side bottom surface of the outer shell is provided with reinforcing ribs at intervals or in a staggered manner.

In the technical scheme, the reinforcing ribs are arranged, so that the overall strength of the battery box can be enhanced; particularly, when the outer shell is made of the non-metal composite material, the problem of insufficient strength of the non-metal composite material can be effectively solved by arranging the reinforcing ribs.

Preferably, the flanging and the groove are further connected in a bonding or welding mode.

In the technical scheme, the flanging and the groove are connected in a bonding or welding mode, so that the connection strength between the inner shell and the outer shell can be further enhanced.

Preferably, the inner housing and the outer housing are both made of a non-metallic composite material comprising a fibre reinforced resin based composite material.

In the technical scheme, the inner shell and the outer shell which are made of the non-metal composite material are formed in one step, so that the processing precision is high, the heat preservation performance is good, the flame retardance is good, and the forming structure is high; the heat insulation property of the composite material can reduce the influence of the environmental temperature on the temperature in the battery box, effectively solve the problem of condensation in the battery box and effectively avoid the safety risks of insulation failure and the like caused by condensed water; the inner container made of the composite material can also improve the corrosion resistance of the battery box and prolong the service life of the battery box.

Preferably, the fiber reinforced resin matrix composite material comprises a glass fiber reinforced resin matrix composite material, and/or a carbon fiber reinforced resin matrix composite material, and/or a resin fiber reinforced resin matrix composite material, and/or a ceramic fiber reinforced resin matrix composite material.

In the technical scheme, the fiber reinforced resin matrix composite materials are excellent choices for manufacturing the battery box.

The utility model also provides a battery box, battery box includes case lid and above-mentioned lower box, go up the case lid with lower box intercombination will the holding chamber is sealed.

In this technical scheme, through the lower box that adopts interior outer shell structure, when forming the battery box with upper box cover intercombination, not only guaranteed the bulk strength of battery box, still guaranteed the leakproofness of battery box. Especially when this battery box uses non-metallic material to make, the structural design of this battery box can effectively compensate non-metallic material's not enough problem of intensity.

The utility model also provides a battery pack, the battery pack comprises a battery box and a battery unit arranged in the accommodating cavity, the battery unit comprises an electric core or a battery module formed by the electric core, the outer side surface of the lower box body is provided with a quick-change unit or a fixing unit, and the quick-change unit is used for realizing the detachable connection of the battery pack relative to an electric automobile; the fixing unit is used for fixedly connecting the battery pack with the electric automobile.

In the technical scheme, when the battery box is used for forming a battery pack, the battery unit and the electrical element are sealed in the accommodating cavity defined by the upper box cover and the lower box body, so that a protective barrier is formed for the battery unit and the electrical element and a heat preservation effect is achieved; and the quick-change unit or the fixing unit is used for realizing the connection between the battery pack and the electric automobile.

Wherein, quick change unit includes but not limited to: the electric/liquid cooling connector, the locking mechanism and the like, wherein the locking mechanism comprises a thread locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a plurality of bolts), a lock pin locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a lock pin locking mode), a rotary locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a rotary locking mode), a turnover locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a turnover locking mode), a jacking locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a jacking locking mode), a staggered tooth locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a staggered tooth locking mode), a bolt locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a bolt locking mode), and a push-pull locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a push-pull locking mode);

the fixing unit includes a bolt-type locking mechanism or other types of fixedly-connected mechanisms (including but not limited to mechanical, electrical or magnetic connection type, etc.), etc.

The utility model also provides an electric automobile, including above-mentioned battery package.

Through installing suitable quick change unit or battery package fixed unit for the battery package can be used to quick change electric automobile (the battery package detachably connects in the automobile body, can carry out quick car electricity separation), electric automobile of chargeable type (the battery package is fixed in the automobile body to load and charge as main ability means on the automobile body), have electric automobile of types such as the electric automobile of quick change and charge function concurrently.

In this technical scheme, when using above-mentioned battery package to electric automobile on, when guaranteeing the bulk strength of battery box, can also guarantee the leakproofness of this battery box. Especially when this battery box uses non-metallic material to make, the structural design of this battery box can effectively compensate non-metallic material's not enough problem of intensity.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in:

above-mentioned lower box, battery package and electric automobile of battery box, battery box adopt interior outer shell structure, utilize turn-ups and recess cooperation to be connected and make interior casing detain the shell body in the edge, realize the additional connection between interior outer shell, the wholeness of reinforcing interior outer shell, the intensity of box under the reinforcing under the circumstances of control gross weight to promote the bulk strength of box down.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a lower case of the battery case shown in fig. 1.

Fig. 3 is a schematic structural view of the battery box shown in fig. 1 in which battery modules and electric components are placed.

Fig. 4 is a schematic cross-sectional view of the battery case shown in fig. 1.

Fig. 5 is a plan view of the groove of the outer housing shown in fig. 1.

Fig. 6 is a schematic cross-sectional view of a battery box according to a second embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of a battery box according to a third embodiment of the present invention.

Fig. 8 is a schematic structural view of an upper case cover of a battery case according to an experimental example of the present invention.

Description of the reference numerals

Battery box 100

Upper box cover 101

Case lid housing 105

Insulation layer 106

Protective layer 107

Lower box 102

Inner housing 1

Flanging 11

Extension 111

Bottom section 112

Interior surface 113

Outer casing 2

Groove 21

Side wall reinforcing structure 22

Recess 23

In-groove ribs 24

Accommodating chamber 3

Sealing strip 103

Quick change unit 104

Battery unit 200

Electrical component 300

Detailed Description

The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.

Fig. 1 shows a battery pack for an electric vehicle, which includes a battery box 100, and a plurality of battery cells 200 and a plurality of electric components 300 disposed in the battery box 100. The battery unit 200 is used for storing power, and the electrical component 300 is used for connecting the battery unit 200 and an external component.

The battery box 100 includes an upper case 101 and a lower case 102. As shown in fig. 2 and 3, the lower case 102 includes a receiving cavity 3 having an upper end opened, and the receiving cavity 3 is used for receiving a plurality of battery cells 200 and a plurality of electrical components 300. The lower case 102 is used in combination with the upper case cover 101 to form the battery case 100.

As shown in fig. 4, the lower box 102 includes an inner shell 1 and an outer shell 2 stacked together, a groove 21 is provided at an upper edge of the outer shell 2, a flange 11 extending into the groove 21 is provided at an upper end of the inner shell 1, and the flange 11 is connected with the groove 21 in a matching manner. The battery box 100 adopts an inner-outer shell structure, so that the heat conduction inside and outside the box body can be reduced, the heat insulation performance is improved, and the strength of the lower box body can be improved due to the inner-outer two-layer structure; further utilize turn-ups 11 and recess 21 cooperation to be connected to make interior casing 1 detain shell body 2 at the edge, realize the reinforced connection between interior and exterior casing, the wholeness of reinforcing interior and exterior casing, the intensity of box 102 under the reinforcing under the circumstances of control gross weight to the bulk strength of box 102 under the promotion.

The larger the area of the turned-over edge 11 covering the inner surface of the groove 21 in the extending direction is, the more the connection strength between the inner shell 1 and the outer shell 2 can be increased, so that the possibility that the turned-over edge 11 is separated from the groove 21 due to deformation can be reduced, and the bonding strength at the edge of the inner shell 1 and the outer shell 2 is improved.

In the present embodiment, the cuff 11 covers the entire inner surface of the groove 21 in the extending direction, and continues to extend outward of the groove 21 to form the protruding portion 111. The protrusion 111 is located on the combining surface between the upper case cover 101 and the lower case 102, and the protrusion 111 is attached to the outer edge of the groove 21.

Wherein, the turned-over edge 11 covers the whole inner surface of the groove 21 in the extending direction, so that the turned-over edge 11 can be firmly embedded in the groove 21. When the flanging 11 covers the bottom surface inside the groove 21 in the extending direction, when the flanging 11 generates a deformation trend of coming out from the groove 21, the bottom section 112 covering the bottom surface inside the groove 21 can be clamped in the groove 21 under the effect of the deformation trend, and the flanging 11 can be prevented from coming out to a great extent. The flanging 11 and the inner surface of the groove 21 are attached, so that the flanging and the groove can be tightly connected, and the connection integrity of the flanging and the groove is improved.

On the other hand, when the upper cover 101 and the lower case 102 are combined with each other, the protruding portion 111 provided on the combining surface between the upper cover 101 and the lower case 102 is interposed between the upper cover 101 and the lower case 102, so that the inner case 1 can be more tightly pressed against the outer case 2.

As shown in fig. 4, the thickness of the bottom section 112 of the flange 11 covering the inner bottom surface of the recess 21 is greater than the average thickness of the flange 11. When the flanging 11 deforms to cause the flanging to have a tendency of falling out, the bottom section 112 covering the inner bottom surface of the groove 21 is subjected to a larger extrusion force; by increasing the thickness of the bottom section 112 of the flange 11, the deformation resistance of the bottom section 112 can be enhanced, and the clamping strength of the flange 11 and the groove 21 can be further enhanced.

As shown in fig. 5, the inner bottom surface of the groove 21 is provided with in-groove ribs 24 at intervals along the length direction of the groove 21, and the bottom section 112 covering the inner bottom surface of the groove 21 abuts against the in-groove ribs 24. By arranging the in-groove reinforcing ribs 24 in the grooves 21, the strength of the outer shell 2 at the grooves 21 is improved, and the grooves 21 of the outer shell 2 are prevented from becoming weak links of the strength of the lower box body 102.

In the present exemplary embodiment, the transition of the inner surface 113 of the flange 11 facing away from the recess 21 is gentle at the corners. Through the structure, the stress concentration of the inner shell 1 at the corner of the flanging 11 can be avoided.

In this embodiment, the groove 21 may be used as a sealing groove for accommodating a sealing strip 103 for sealing the upper case cover 101 and the lower case 102. When the groove 21 is used as a sealing groove, the groove 21 accommodates not only the burring 11 but also the sealing strip 103; the groove 21 has a function of connecting the inner case 1 and the outer case 2 and a function of sealing the upper case lid 101 and the lower case lid 102. The outer shell 2 only needs to be provided with one groove 21, and no additional sealing groove is needed, so that the strength of the outer shell 2 is prevented from being reduced due to additional grooving of the outer shell 2; moreover, the flanging 11 of the inner shell 1 extends into the groove 21, so that the sealing strip 103 can be attached to the groove 21 in a large area, and the upper box cover 101 and the lower box body 102 can be better sealed.

When the cuff 11 continues to extend to form the extension 111, the weather strip 103 may be disposed between the extension 111 and the outer case 2, further enhancing the sealing effect of the battery case. In addition, when the groove 21 is used as a sealing groove at the same time, the transition of the inner surface 113 of the flange 11 departing from the groove 21 at the corner is gentle, the contact condition of the flange 11 and the sealing strip 103 at the corner can be improved, and the sealing effect is improved.

As shown in fig. 4, the thickness of the outer shell 2 is not less than the thickness of the inner shell 1, and the outer peripheral surface of the outer shell 2 extends outward to form a side wall reinforcing structure 22, and the groove 21 is disposed on the upper end surface of the side wall reinforcing structure 22. By arranging the side wall reinforcing structure 22, the overall thickness of the outer shell 2 is ensured, so that the outer shell 2 can be used as a main stress component of the lower box body 102, and the strength of the lower box body 102 can be ensured; the side gusset structures 22 also provide space for the placement of the channels 21.

The outer peripheral surface of the side gusset structure 22 is provided with a plurality of recessed portions 23 recessed toward the outer peripheral surface of the outer case 2. By providing the recessed portion 23, the strength of the outer case 2 is ensured, and the overall weight of the battery box is also reduced. In addition, a light heat-insulating material can be placed in the concave portion 23, the heat-insulating performance of the lower box body is improved, the side wall reinforcing structure 22 is covered and fixed with the connecting plate, and when the quick-change unit or the fixing unit connected with the electric automobile is fixed, even if the light heat-insulating material is not placed, the air in the concave portion 23 can also play a certain heat-insulating effect, and the heat-insulating performance of the lower box body is improved.

Wherein, the inner side surface and the outer side bottom surface of the outer shell 2 can also be provided with reinforcing ribs. The reinforcing ribs can be arranged at intervals or staggered. Through setting up the strengthening rib, can strengthen the bulk strength of battery box. Particularly, when the outer shell 2 is made of the non-metal composite material, the problem of insufficient strength of the non-metal composite material can be effectively solved by arranging the reinforcing ribs. Preferably, reinforcing ribs which are intersected vertically and horizontally are formed on the inner side surface (the surface facing the inner shell 1) of the outer shell 2, the reinforcing ribs and the inner shell are bonded or welded, the outer shell and the inner shell are separated into a plurality of chambers by the reinforcing ribs to form a chamber structure, and light heat-insulating materials can be placed in the chamber structure to improve the heat-insulating performance of the lower box body. Still be formed with cavity structure between outer casing and interior casing to the thermal-insulated heat preservation effect of box under the improvement, simultaneously, the box is made by non-metallic composite material down, compares with metal material's casing, has further strengthened thermal insulation performance, and non-metallic composite material's density is littleer than metal material moreover. For box under the metal material, the non-metal composite material of this application is box under satisfying under the condition that battery box intensity required, and thermal insulation performance is better, and weight ratio metal material box is light, and production technology is simpler, has improved economic benefits.

In this embodiment, the flange 11 and the groove 21 may be connected by bonding or welding. The connecting strength between the inner shell 1 and the outer shell 2 can be further enhanced by connecting the flanges 11 and the grooves 21 in a bonding or welding manner.

In the present embodiment, both the inner housing 1 and the outer housing 2 may be made of a non-metallic composite material, such as a fiber reinforced resin based composite material. The fiber reinforced resin matrix composite material can be one or more of a glass fiber reinforced resin matrix composite material, a carbon fiber reinforced resin matrix composite material, a resin fiber reinforced resin matrix composite material and a ceramic fiber reinforced resin matrix composite material. The lower box body can also be made of other high-molecular composite materials which are light in weight and have certain strength and high-temperature performance, and preferably, the high-molecular composite materials are fiber reinforced resin matrix composite materials. Of these, SMC composite material is preferably used as the material of the inner case 1 and the outer case 2.

The inner shell 1 and the outer shell 2 made of the non-metal composite material are formed in one step, so that the processing precision is high, the heat preservation performance is good, the flame retardance is good, and the forming structure is high; due to the heat insulation property of the composite material, the influence of the environmental temperature on the temperature in the battery box can be reduced, the generation of condensation in the battery box can be effectively solved, and the safety risks such as insulation failure caused by condensed water are effectively avoided; the lower box body made of the composite material can also improve the corrosion resistance of the battery box and prolong the service life of the battery box.

The battery pack is formed after the battery unit 200 and the electrical element 300 are installed in the battery box, and the battery unit 200 may be a battery core or a battery module formed by the battery core. A quick-change unit 104 is mounted on the outer side surface of the lower box body 102, and the quick-change unit 104 is used for realizing detachable connection of the battery pack relative to the electric vehicle. The quick-change unit 104 includes a locking mechanism and electric/liquid cooling connectors, etc. necessary for quick-changing the battery pack. Quick change units include, but are not limited to: the electric/liquid cooling connector comprises an electric/liquid cooling connector, a locking mechanism and the like, wherein the locking mechanism comprises a thread locking mechanism (a locking mechanism for fixing a battery box and a vehicle body through a plurality of bolts), a lock pin locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a lock pin locking mode), a rotary locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a rotary locking mode), an overturning locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through an overturning locking mode), a jacking locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a jacking locking mode), a staggered tooth locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a staggered tooth locking mode), a bolt locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a bolt locking mode), and a push-pull locking mechanism (a locking mechanism for fixing the battery box and the vehicle body through a push-pull locking mode).

When the battery pack is formed by using the battery box, the battery unit 200 and the electrical element 300 are sealed in the accommodating cavity 3 enclosed by the upper box cover 101 and the lower box body 102, so that the battery unit 200 and the electrical element 300 are protected and have a heat preservation effect. In addition, the lower box body 102 of the battery box is made of a non-metal composite material, so that the weight of the battery box can be reduced compared with a shell made of a metal material, and the heat preservation effect and the economic benefit are further improved.

In other embodiments, the quick-change unit 104 may be replaced by a fixing unit, and the fixing unit is used to fixedly connect the battery pack to the electric vehicle. The fixing unit may be a bolt-type locking mechanism or other types of fixedly-connected mechanisms (including but not limited to mechanical, electrical, or magnetic connection type, etc.).

Through installing suitable quick change unit or battery package fixed unit for the battery package can be used to the electric automobile of types such as quick change electric automobile (battery package detachably connects in the automobile body, can carry out quick car electricity separation), chargeable electric automobile (battery package is fixed in the automobile body, charges as main can supply means with loading on the automobile body), the electric automobile that has quick change and the function of charging concurrently.

When using above-mentioned battery package to electric automobile, when guaranteeing the bulk strength of battery box, can also guarantee the leakproofness of this battery box. Especially when this battery box uses non-metallic composite to make, the structural design of this battery box can effectively compensate the not enough problem of non-metallic material's intensity.

Example two

Most of the structure of the present embodiment is the same as that of the first embodiment, except for the coverage area of the flange 11 in the groove 21.

As shown in fig. 6, in the present embodiment, the cuff 11 covers one side inner surface of the groove 21 in the extending direction thereof. The turned-over edge 11 covers only one side of the inner surface of the groove 21, so that the function of buckling the outer shell 2 at the edge of the inner shell 1 can be realized. The flanging 11 with shorter extension length has small processing difficulty. When the groove 21 is a sealing groove, because the turned-over edge 11 only covers the inner surface of one side of the groove 21, one part of the sealing strip 103 is in sealing fit with the turned-over edge 11, and the other part is also sealed with the outer shell 2, thus the sealing between the outside and the inner space of the accommodating cavity 3 can be realized; meanwhile, the sealing of the space between the outside and the inner shell and the space between the outside and the outer shell can be realized, and under the condition that a cavity structure is arranged between the inner shell 1 and the outer shell 2, the cavity structure is sealed, so that the heat insulation performance of the lower box body can be improved.

EXAMPLE III

As shown in fig. 7, in the present embodiment, the burring 11 covers not only the side edges of the groove 21 but also the inner bottom surface of the groove 21 in the extending direction thereof. That is, the cuff 11 has a bottom section 112 covering the inner bottom surface of the recess 21. When the flanging 11 deforms to cause the flanging to have a falling-off tendency, the flanging 11 is provided with the bottom section 112 covering the inner bottom surface of the groove 21, so that the bottom section 112 can resist the deformation of the groove 21, and the clamping strength of the flanging 11 and the groove 21 is further enhanced.

Test examples

At present, a sheet metal battery pack (mica sheets are used as heat insulation materials) is used for a certain quick-change electric automobile, and the weight of the quick-change electric automobile is 371.5kg. According to the first embodiment, the non-metal composite battery pack having the same dimensional specification (external dimension and internal space dimension of the battery case) is prepared.

By using the lower box body made of the non-metal composite material in the first embodiment, the inner side surface of the outer shell is provided with the criss-cross reinforcing ribs, and the reinforcing ribs separate the outer shell 2 and the inner shell 1 into a plurality of chambers to form a chamber structure. The height of the cavity structure between the outer shell 2 and the inner shell 1 (namely the distance between the surfaces of the outer shell 2 and the inner shell 1) is 5mm, the lower box formed when the aerogel is not placed in the cavity structure is marked as a lower box A made of a non-metal composite material, the lower box formed when the aerogel is placed in the cavity structure is marked as a lower box B made of a non-metal composite material, the lower box A made of the non-metal composite material and the lower box B made of the non-metal composite material are combined with the upper box cover respectively in a buckling mode, a non-metal composite material battery box is formed, the battery box A made of the non-metal composite material and the battery box B made of the non-metal composite material are respectively marked as a battery box A and a battery box B made of the non-metal composite material, and the battery module A and the battery box B made of the non-metal composite material are formed after necessary electrical elements are respectively loaded into the battery module. See fig. 1.

As shown in fig. 8, the upper case cover 101 made of a non-metal composite material for forming the non-metal composite material battery case with the non-metal composite material lower case a and the non-metal composite material lower case B includes a case cover outer shell 105, a heat insulating layer 106, and a protective layer 107. Insulating layer 106 and protective layer 107 cover in proper order and are fixed in case lid shell 105 and face lower box 102 one side, and the material of case lid shell 105 is the SMC, and the material of insulating layer 106 is the aerogel felt of thickness 5mm, and the material of protective layer 107 is fire prevention cloth, all adopts structure glue adhesive connection's mode to connect between case lid shell 105 and the insulating layer 106 and between insulating layer 106 and the protective layer 107 to set up concave-convex structure in order to increase intensity on case lid shell 105.

The upper box cover 101 and the lower box body 102 are sealed in a U-shaped sealing mode, a concave portion is arranged on the side face of the upper box cover 101 and matched with a convex portion arranged on the side face of the lower box body 102 to form a buckle connection (the structure of the buckle connection and the U-shaped sealing is shown in figures 1 and 4), and the upper box cover 101 and the lower box body 102 are subjected to one-step mould pressing to realize buckling of the buckle connection structure.

And testing the non-metal composite material battery pack A, the non-metal composite material battery pack B and the metal plate material battery pack with the same size and specification.

In terms of weight test, the mass of the lower box body B made of the non-metal composite material is 45kg, and the mass of the lower box body made of the sheet metal material (mica sheets are used as the heat insulation material) with the same size specification is 60.4kg. Compare box under panel beating material, box B subtracts heavy 25.5% under the nonmetal composite. The weight of the battery box B made of the non-metal composite material is 57.8kg, the weight of the battery box made of the sheet metal material is 70.772kg, and the weight advantage of the battery box made of the non-metal composite material is obvious. Compared with the nonmetal composite material lower box body B, the nonmetal composite material lower box body A lacks the aerogel felt placed in the cavity structure, and the aerogel felt is low in density and low in usage amount, so that the nonmetal composite material lower box body A is equivalent to the nonmetal composite material lower box body B in quality and slightly reduced (almost negligible). In the aspect of the total weight of the battery pack, the total weight of the non-metal composite material battery pack A and the non-metal composite material battery pack B is reduced by 2-3% compared with that of a metal plate battery pack, and the weight advantage is obvious.

In the aspect of strength testing, non-metal composite material lower box A and non-metal composite material lower box B and the non-metal composite material upper cover used for forming the composite material non-metal battery box by combining with the non-metal composite material lower box A and the non-metal composite material lower box B all meet GB/T31467.3-2015 part 3 of lithium ion power storage battery pack and system for electric automobile: safety requirements and requirements of strength and the like specified in test methods (1.5 times of the standard can be achieved in actual test). Can be used for electric automobiles.

Thermal insulation performance and heat insulation performance: the initial temperature in the package is 20-30 ℃, the package is placed in an environment of 7-9 ℃ for 600min, the accumulated temperature change rate (accumulated cooling rate) of the single battery core in the package of the non-metal composite material battery package A is lower than 50% of that of the metal plate material battery package (the temperature of the single battery core is measured by optical fibers), and the accumulated temperature change rate of the single battery core in the package of the non-metal composite material battery package B is about 40% of that of the metal plate material battery package. Under lower temperature, this advantage is more obvious, uses in the cold area in the north, can guarantee that the temperature of electricity core is in under the operating temperature of preferred. And through tests, the nonmetal composite material battery pack A and the nonmetal composite material battery pack B can resist the high temperature of 1000 ℃, and in a test for simulating the ignition of the battery, even if the battery is completely combusted, the nonmetal composite material box body is basically kept in a good condition in the whole test process, and only smoke is generated and open fire is not generated.

The battery core placing cavities of the nonmetal composite material battery pack A and the nonmetal composite material battery pack B are filled with the heat conducting glue (the filling height of the heat conducting glue is about 1/3 of the height of the battery), so that the temperature uniformity between the battery cores is improved, and the thermal runaway caused by abnormal temperature of individual battery cores is avoided. And secondly, each battery cell (or a battery module formed by the battery cells) in the battery box is integrated, so that the overall strength of the battery pack is increased. Compared with the sheet metal material battery pack, in the same environment, when the non-metal composite material battery pack B is charged with 40A charging current (SOC is from 0 to 100%), the accumulated temperature of the sheet metal material battery pack is increased by more than 5 ℃ compared with that of the non-metal composite material battery pack B, the charging capacity of the non-metal composite material battery pack B is higher than that of the sheet metal material battery pack by more than 5%, and the uniformity of the maximum temperature difference (obtained by recording the temperature of all positive and negative electrode lugs) in the box body of the composite material non-metal battery pack is maintained at 1.5 to 2 ℃. This not only is relevant with having used heat-conducting glue, still is higher than the sheet metal material with SMC's specific heat capacity and thermal insulation performance and is relevant, and above-mentioned factor makes the nonmetal combined material battery package of this application more have the advantage than the sheet metal material battery package in the aspect of avoiding the thermal runaway.

The properties of some of the raw materials used in the above test examples are as follows:

SMC meets the following performance requirements: the tensile strength of the material grade (disordered glass fiber state) is more than or equal to 70MPa (GB/T1447-2005), the bending strength is more than or equal to 160MPa (GB/T1449-2005), and the impact toughness is more than or equal to 55KJ/m ² (GB/T1451-2005) and the elongation at break is more than or equal to 1.3% (GB/T1447-2005).

The aerogel blanket had a density of about 0.16mg/cm ³ 。

The shear strength (anodic alumina-anodic alumina) of the structural adhesive is more than or equal to 6MPa, the tensile strength is more than or equal to 5MPa, and the flame retardant grade is V0.

The SMC, the aerogel felt and the structural adhesive can be a commercial product or a self-made product meeting the performance requirements, and the rest materials are commercial products.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The utility model provides a lower box of battery box, its upper end open-ended holding chamber that has for with last case lid intercombination in order to form the battery box, a serial communication port, lower box is including stacking interior casing and the shell body that sets up, the upper end edge of shell body is equipped with the recess, the upper end of interior casing be equipped with to the turn-ups that extends in the recess, the turn-ups with the recess cooperation is connected.

2. The lower case of the battery case according to claim 1, wherein the flange covers at least a part of the inner surface of the groove in the extending direction thereof and is attached to the inner surface of the groove.

3. The lower case of the battery case as set forth in claim 2, wherein the burring covers at least to the bottom surface inside the groove in the extending direction thereof.

4. The lower case of the battery case as set forth in claim 3, wherein the thickness of the bottom section of the burring covering the inner bottom surface of the groove is greater than the average thickness of the burring.

5. The lower case body of the battery case according to claim 2, wherein the flange covers the entire inner surface of the groove in the extending direction and continues to extend outward of the groove to form a protruding portion, the protruding portion is located on a combined surface between the upper case cover and the lower case body, and the protruding portion is attached to an outer edge of the groove.

6. The lower case of a battery box according to claim 3, wherein the inner bottom surface of the groove is provided with in-groove ribs at intervals along the length direction of the groove, and the bottom section covering the inner bottom surface of the groove abuts against the in-groove ribs.

7. The lower case body of the battery case as set forth in any one of claims 1 to 6, wherein the inner surface of the burring facing away from the groove is gently rounded at the corners.

8. The lower case body of the battery case according to any one of claims 1 to 6, wherein the groove is a seal groove for receiving a seal strip for sealing the upper case cover with the lower case body.

9. The lower case body of the battery case according to any one of claims 1 to 6, wherein the thickness of the outer case body is not less than the thickness of the inner case body, the outer peripheral surface of the outer case body extends outwards to form a side wall reinforcing structure, and the groove is arranged on the upper end surface of the side wall reinforcing structure.

10. The lower case of the battery case according to claim 9, wherein the outer circumferential surface of the side gusset structure is provided with a plurality of depressions depressed toward the outer circumferential surface of the outer case.

11. The lower case of the battery case as set forth in claim 9, wherein the inner side surface or the outer side bottom surface of the outer case is provided with reinforcing ribs at intervals or in a staggered manner.

12. The lower case of the battery case as set forth in claim 10, wherein the inner side surface or the outer side bottom surface of the outer case is provided with reinforcing ribs at intervals or in a staggered manner.

13. The lower case body of the battery case as set forth in claim 1, wherein the flanges and the grooves are further connected by means of bonding or welding.

14. The lower case of the battery box according to claim 1, wherein the inner case and the outer case are each made of a non-metallic composite material, and the non-metallic composite material includes a fiber reinforced resin-based composite material.

15. The lower case of the battery case according to claim 14, wherein the fiber-reinforced resin-based composite material comprises a glass fiber-reinforced resin-based composite material, or a carbon fiber-reinforced resin-based composite material, or a resin fiber-reinforced resin-based composite material, or a ceramic fiber-reinforced resin-based composite material.

16. A battery box, characterized in that the battery box comprises an upper box cover and a lower box body according to any one of claims 1-15, and the upper box cover and the lower box body are combined with each other to close the accommodating cavity.

17. A battery pack, characterized in that the battery pack comprises the battery box of claim 16 and a battery unit arranged in the accommodating cavity, the battery unit comprises a battery core or a battery module formed by the battery core, a quick-change unit or a fixing unit is mounted on the outer side surface of the lower box body, and the quick-change unit is used for realizing detachable connection of the battery pack with respect to an electric vehicle; the fixing unit is used for fixedly connecting the battery pack with the electric automobile.

18. An electric vehicle comprising the battery pack according to claim 17.