CN217281072U

CN217281072U - Combination box body of battery pack, battery pack and electric automobile

Info

Publication number: CN217281072U
Application number: CN202123455819.1U
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: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-08-23
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a combination box, battery package and electric automobile of battery box, the combination box includes: the first box body and the second box body are both made of non-metal composite materials, and are combined with each other along the combination direction; the connecting mechanism corresponds to the combination surface of the first box and the second box, the connecting mechanism comprises a connecting piece and a locking piece, the end part of the connecting piece is arranged on the combination surface of the first box and the second box, and the end part of the connecting piece penetrates through the first box and the second box in sequence in the combination direction and is locked on the locking piece on one side of the second box. According to the combined box body, under the condition that the first box body and the second box body are made of the non-metal composite material, the problem of connection reliability caused by connection in the mode of arranging internal threads on the first box body or the second box body and the like is solved.

Description

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

Technical Field

The utility model relates to an electric automobile technical field, in particular to combination box, battery package and electric automobile of battery package.

Background

The electric automobile has the advantages of zero emission, low noise, economical operation and maintenance and the like, and is more and more favored by users. The energy used by the electric automobile is the electric energy provided by the self-carried battery pack, and the electric automobile needs to be charged after the electric energy is used up. The battery pack of the electric vehicle is generally installed in a fixed type or a replaceable type, wherein the fixed type battery pack is generally fixed to the vehicle and the vehicle is directly used as a charging target during charging. The replaceable battery pack is generally fixed to a bracket of the vehicle in a movable mounting manner, and the replaceable battery pack can be removed to be replaced or charged independently and then mounted on the vehicle after the replacement battery pack is charged.

In the prior art, a shell of a battery box is usually made of metal, the shell has high strength but poor heat insulation performance, and the temperature inside the battery box is low easily in a low temperature region, so that a battery cannot work normally.

The shell body made of the non-metal composite material has good heat preservation performance, and can solve the heat preservation problem in the low temperature region, however, the strength of the composite material is lower than that of metal and is easy to damage, especially at the joint of the upper and lower box bodies, if the existing box body made of metal material is provided with threads on the upper and lower box bodies, and then the scheme of installing the screws is applied to the box body made of the composite material, because the material strength of the composite material can not support the durability of the threads in the use required in the long-term use, the upper and lower box bodies made of the composite material are easy to damage at the threaded joint, and the use reliability is not high.

By prefabricating the nut within a non-metallic composite material, the above problems can be avoided, but this also brings with it the following inconveniences: (1) the requirement on the machining precision is high, only one prefabricated nut is inaccurate in positioning, the whole shell is scrapped, and the production cost is undoubtedly greatly increased. (2) When the non-metal composite shell adopts a compression molding method, the mode of prefabricating the nut is easy to damage the mold.

For the reasons, the electric automobiles on the market at present basically adopt the metal battery boxes, and the composite material non-metal battery boxes are rarely used for business.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to at least one of the high defect of low, fragile, the machining precision requirement of the combined material box of overcoming prior art to upper and lower box connection department intensity, provide a combination box, battery package and the electric automobile of battery package.

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

a built-up case of a battery case, comprising:

the first box body and the second box body are both made of non-metal composite materials, and are combined with each other along the combination direction;

the connecting mechanism corresponds to the combination surface of the first box and the second box, the connecting mechanism comprises a connecting piece and a locking piece, the end part of the connecting piece is arranged on the combination surface of the first box and the second box, and the end part of the connecting piece penetrates through the first box and the second box in sequence in the combination direction and is locked on the locking piece on one side of the second box.

Among this technical scheme, the tip end of the connecting piece on first box side is reconnected to the retaining member after passing first box and second box in proper order to fix the relative second box of first box through the mode of connecting piece and retaining member follow both sides centre gripping. This structure setting, under the condition that first box and second box adopt non-metallic composite to make, avoid seting up modes such as internal thread on first box or second box and connect and the connection reliability problem that leads to.

The non-metal composite material can be a reinforced resin composite material, so that the weight can be reduced, the cost can be reduced, and the convenience can be improved. The non-metal composite material can also be other high-molecular composite materials with light weight and certain strength and high-temperature performance, and the preferable non-metal composite material is a fiber reinforced resin matrix composite material which has better strength and heat-insulating performance and is convenient to machine and form. The non-metallic composite material is preferably a glass fiber reinforced resin matrix composite material, and the non-metallic composite material is preferably SMC (sheet molding compound), also called sheet molding compound, which is a high polymer composite material, and the main raw materials of the non-metallic composite material comprise SMC special-purpose yarns, unsaturated resin, low-shrinkage additives, fillers and various auxiliaries. The high-temperature one-step compression molding process has the advantages of high mechanical strength, light material weight, corrosion resistance, long service life, high insulating strength, arc resistance, flame retardance, good sealing performance, flexible product design, easy large-scale production, safety and attractiveness, all-weather protection function, and capability of overcoming the defects of easy corrosion, short service life, poor heat insulation and heat preservation performance and the like of a metal box body.

Preferably, the locking member is positioned on the second box body through a mounting structure, and the mounting structure can limit the rotation of the locking member.

Among this technical scheme, through setting up the displacement and the rotation of mounting structure restriction retaining member relative second box, reduce the degree of difficulty of being connected of connecting piece and retaining member to, after the completion is connected, because the retaining member can't rotate, with stop to have under the long-term in service behavior of battery box with the retaining member rotation the not hard up possibility that leads to.

Preferably, the mounting structure includes a positioning groove formed on the second box, the positioning groove extends to a side surface of the second box along a direction perpendicular to the assembling direction and forms an opening, and the locking member is accommodated in the positioning groove and is restricted by groove walls on two sides of the positioning groove to rotate.

Among this technical scheme, the opening that extends to the second box side surface through the constant head tank puts the retaining member in the constant head tank to the rotation of retaining member is restricted through the both sides cell wall of constant head tank, thereby realizes being connected of connecting piece and retaining member. The mode that further can match through constant head tank and the retaining member appearance that forms on the second box realizes displacement of retaining member and pivoted spacingly, compares in the structural scheme of other location retaining members, and this scheme atress is even, and the second box that more adaptation was made by non-metal composite.

Preferably, the groove walls on two sides of the positioning groove are provided with constraining ribs protruding out of the surfaces of the groove walls, the constraining ribs are used for abutting against the locking member, and the width of the constraining ribs in the direction away from the groove walls is gradually reduced.

In this technical scheme, the restraint muscle can carry out preliminary restraint and location to the retaining member of putting into the standing groove, and the retaining member that can avoid putting into falls out. Adopt the structure that tapers, at the in-process of screwing up for the retaining member is screwing up the in-process, and the restraint muscle can have a small amount of deformations, thereby makes the position of retaining member finely tune, so that the counterpoint of the relative retaining member of connecting piece is connected, has reduced the degree of difficulty of assembly and has required to box machining precision.

Preferably, the outer circumferential surface of the second box body extends outwards to form a side wall reinforcing structure, the side wall reinforcing structure is provided with a plurality of concave parts which are concave towards the outer circumferential surface of the second box body, and the positioning groove is formed in the concave parts.

Among this technical scheme, through setting up the constant head tank in the depressed part, utilize side wall additional strengthening to strengthen the protection to the retaining member in the constant head tank, can reduce the influence that external environmental factor caused to the reliable locking of retaining member.

Preferably, the combination box further includes a connection plate disposed at least on a side surface of the second box and covering an opening of the positioning groove at the side surface of the second box.

Among this technical scheme, cover the constant head tank and communicate to external opening through setting up the connection plate to improve protection and the dustproof effect to the retaining member, avoid the retaining member to produce under the influence of external factor not hard up.

Preferably, the connecting plate member is provided around the entire side surface of the second case along the circumferential side of the second case.

Among this technical scheme, utilize and connect the plate to strengthen the week side of second box to promote the structural strength of the second box that the material is non-metallic composite.

Preferably, the second box body is a lower box body, the connecting plate further extends and is connected with a box body bottom surface of the second box body, and the connecting plate extends to a position covering an orthographic projection of the inner side edge of the containing cavity of the second box body on the box body bottom surface.

Among this technical scheme, utilize to connect in the box bottom surface of connecting the plate to the second box and strengthening the box bottom surface of second box to when guaranteeing that the second box adopts non-metallic composite material to promote the heat preservation performance of battery box, consolidate and protect battery box weak position, compensatied non-metallic composite material's intensity defect, promoted the durability of non-metallic composite material battery box, and equal or have the advantage with metal material battery box in the overall quality.

Simultaneously, connect the plate and carry out the bearing in the bottom of second box for the bottom of battery box need not extra additional strengthening and carries out the bearing.

Preferably, the first box body comprises a first box body outer shell and a first box body inner shell which are arranged in a stacked mode, and the end portions of the connecting pieces penetrate through the first box body outer shell and the first box body inner shell respectively;

and/or the second box body comprises a second box body outer shell and a second box body inner shell which are stacked, and the end parts of the connecting pieces penetrate through the second box body outer shell and the second box body inner shell respectively.

In the technical scheme, the first box body and the second box body are formed by combining the outer shell and the inner shell which are stacked respectively, so that the heat preservation effect is further improved. The end parts of the connecting pieces penetrate through the outer shell and the inner shell respectively, so that the connecting effect of the connecting mechanism on each box body is improved, and the local damage of the box body caused by local stress is avoided.

Preferably, the connecting piece is a bolt, the locking piece comprises a nut, and the threaded end of the connecting piece is connected with the threads of the locking piece.

Among this technical scheme, the adoption carries out threaded connection for bolted connection spare with the retaining member for the nut, compares other locking connection's scheme, simple structure, connects convenient and reliable.

Preferably, the combined box further comprises an elastic member, the elastic member is located on a combined surface of the first box and the second box and applies a pushing force to the first box and the second box opposite to a combining direction.

Among this technical scheme, the thrust that the elastic component was applyed first box and second box can cooperate with coupling mechanism, provides the pretightning force for the reliable spiro union of the threaded end of retaining member and connecting piece, avoids threaded connection relation to produce in the long-term use not hard up, influences the inseparable combination of first box and second box.

Preferably, the elastic member is a sealing strip, the sealing strip is arranged on the combined surface of the first box body and the second box body in a surrounding manner, and the connecting member further penetrates through the sealing strip.

In the technical scheme, the sealing strip can provide pretightening force for the connecting mechanism and can also seal the combined box body.

Preferably, the first box body is an upper box body, a flange is arranged on the edge of the first box body, and the flange extends towards the periphery of the second box body.

In the technical scheme, the edge-turning structure is arranged, so that rainwater is prevented from permeating the combination surface and the interior of the box body along the edges of the first box body and the second box body, and the purpose of keeping off the rain is achieved.

Preferably, the outer edge of the sealing strip is abutted against the inner surface of the flanging;

and/or the edge of the second box body is abutted against the inner surface of the flanging.

Among this technical scheme, above-mentioned structure sets up, makes the turn-ups realize spacingly to the horizontal position that can the sealing strip to, the turn-ups offsets with the edge of second box, keeps warm and sealed effect is better.

Preferably, a sealing element is arranged between the connecting piece and the first box body; and/or a sealing piece is arranged between the locking piece and the second box body.

Among this technical scheme, through between connecting piece and first box to and set up the sealing member between retaining member and second box, improve waterproof and heat preservation effect.

A battery pack, comprising:

a battery cell;

the combination case as described above, the battery unit is disposed in a space defined by the first case and the second case.

In this technical scheme, battery unit directly forms by a plurality of electric core combinations, or constitutes through a plurality of battery module groups of constituteing by electric core again. Adopt above-mentioned combination box to hold battery unit, the first box and the second box of combination box are connected reliably, and factor of safety is high.

An electric vehicle comprising a battery pack as described above.

In the technical scheme, the battery pack is adopted in the electric automobile, and the combined box body of the battery pack can be reliably connected, so that the requirement on the running reliability of the electric automobile is met.

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

among the combination box, battery package and the electric automobile of battery package, its combination box is reconnected to the retaining member after passing first box and second box in proper order at the tip end of the connecting piece of first box side to fix the relative second box of first box through the mode of connecting piece and retaining member follow both sides centre gripping. This structure setting, under the condition that first box and second box adopt non-metallic composite to make, avoid seting up modes such as internal thread on first box or second box and connect and the connection reliability problem that leads to.

The battery pack adopts the combined box body to contain the battery unit, the battery unit is directly formed by combining a plurality of battery cores, or the battery unit can be formed by combining a plurality of battery modules consisting of the battery cores, and the first box body and the second box body of the combined box body are reliably connected, so that the overall safety coefficient of the battery pack is high.

Drawings

Fig. 1 is a schematic structural diagram of a combined box according to an embodiment of the present invention.

Fig. 2 is a sectional view of a combined box according to an embodiment of the present invention.

Fig. 3 is a partially enlarged view of a portion C in fig. 2.

Fig. 4 is a schematic structural diagram of a combined box according to an embodiment of the present invention, wherein the connecting plate is hidden.

Fig. 5 is a partially enlarged view of a portion D in fig. 4.

Fig. 6 is a schematic view illustrating an installation manner of the retaining member relative to the positioning groove according to an embodiment of the present invention.

Fig. 7 is a schematic bottom view of a combination case according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of an upper case lid according to a test example of the present invention.

Fig. 9 is a schematic structural diagram of a lower case according to an example of the present invention.

Description of reference numerals:

combined box 10

First case 1

Case lid housing 11

Thermal insulation layer 12

Protective layer 13

Flanging 11

Second casing 2

Second casing shell 2a

Second casing inner case 2b

Reinforcing rib 2c

Side wall reinforcing structure 21, depressed part 22, box bottom 23 and accommodating cavity 24

Connecting mechanism 3

Connecting piece 31

Retaining member 32

Mounting structure 4

A positioning groove 41 and a restraining rib 42

Connecting plate 5

Lock shaft 51, guide block 52

Weather strip 6

Detailed Description

The present invention will be more clearly and completely described below with reference to the accompanying drawings.

The utility model provides a set up the battery package on electric automobile, the combination box of battery package is used for holding the battery unit, and through the battery unit who is held, realize the electricity via the relative electric automobile of the electric connection interface that sets up on battery package surface and connect to supply power to electric automobile.

In this embodiment, as shown in fig. 1, the combined box 10 of the battery pack includes a first box 1, a second box 2 and a connecting plate 5, wherein the first box 1 is located at the upper side and is an upper box with an open lower portion, the second box 2 is located at the lower side and is a lower box with an open upper portion, and the first box 1 and the second box 2 are combined with each other along a vertical combining direction a to form a receiving space for receiving a battery unit (not shown in the figure). The first box body 1 and the second box body 2 in the embodiment are both made of non-metal composite materials so as to improve the heat insulation performance.

Connect the panel 5 setting in the second box 2 along width direction B's the left and right sides to fix at second box 2 through modes such as bolted connection and bonding, connect panel 5 and adopt the metal material to make, strengthen in order to the side of second box 2, use the structural strength who promotes the material for non-metallic composite's second box 2, make second box 2 can hold more reliably and bear battery unit.

The connection plate 5 may be used to fix a quick-change unit or a battery pack fixing unit. 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.

Quick-change units include, but are not limited to: 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 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), the push-pull locking mechanism comprises a push-pull locking mechanism (a locking mechanism for fixing the battery box and the vehicle body in a push-pull locking mode), a staggered-tooth locking mechanism (a locking mechanism for fixing the battery box and the vehicle body in a staggered-tooth locking mode), a bolt locking mechanism (a locking mechanism for fixing the battery box and the vehicle body in a bolt locking mode), and a push-pull locking mechanism (a locking mechanism for fixing the battery box and the vehicle body in a push-pull locking mode). The present embodiment employs a staggered tooth locking mechanism composed of a lock shaft and a guide block.

The battery pack 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.), and the like.

In other embodiments, the connecting plate 5 may be fixed to the first case 1 for reinforcing the first case 1, or the connecting plate 5 may be provided circumferentially around the entire circumferential side surface of the second case 2 along the circumferential side of the second case 2. As shown in fig. 1, in this embodiment, a mechanism (the above-mentioned staggered teeth locking mechanism) for realizing the locking connection of the battery pack with respect to the electric vehicle, such as a lock shaft 51 and a guide block 52, may be mounted on the connecting plate 5, and the locking connection mechanism 3 is more reliable than that of the second case 2 made of a non-metal composite material when being disposed on the connecting plate 5. In this embodiment, as shown in fig. 2 and 3, the first casing 1 and the second casing 2 are connected by a connecting mechanism 3, the connecting mechanism 3 is disposed corresponding to a combined surface of the first casing 1 and the second casing 2, and the connecting mechanism 3 includes a connecting member 31 and a locking member 32. Wherein, the connecting piece 31 is a bolt, and the thread end 31a at the lower side thereof penetrates the first case 1 and the second case 2 in sequence along the combining direction a and is locked on the locking piece 32 at one side of the second case 2. The connection scheme of the combined case 10 is to fix the first case 1 relative to the second case 2 in a manner of clamping from both sides by the connecting member 31 and the locking member 32 by connecting the end of the connecting member 31 at the side of the first case 1 to the locking member 32 after sequentially passing through the first case 1 and the second case 2.

According to the structure arrangement scheme, under the condition that the first box body 1 and the second box body 2 are made of the non-metal composite material, the problem of connection reliability caused by connection in the mode that internal threads are formed on the first box body 1 or the second box body 2 and the like is solved.

Wherein, connecting piece 31 and retaining member 32 adopt bolt and nut respectively, compare other locking connection's scheme, simple structure, connect convenient and reliable.

As shown in fig. 3, the locking member 32 is mounted on the second box 2 through the mounting structure 4, and the rotation of the locking member 32 can be limited through the mounting structure 4, so that the displacement and rotation of the locking member 32 relative to the second box 2 are avoided, the connection difficulty between the connecting member 31 and the locking member 32 is reduced, and after the connection is completed, the locking member 32 cannot rotate, so that the possibility of looseness is avoided under the condition of long-term use of the battery box.

Specifically, as shown in fig. 4 and 5, the mounting structure 4 includes a positioning groove 41 formed on the second casing 2, the positioning groove 41 extending to a side surface of the second casing 2 in a direction perpendicular to the combining direction a and forming an opening through which the lock member 32 enters the positioning groove 41 (see fig. 6) and is accommodated in the positioning groove 41. The locking member 32 in this embodiment is a rectangular nut, and both side surfaces of the locking member 32 are restricted in rotation by both side groove walls of the positioning groove 41. The coupling of the coupling member 31 and the locking member 32 is accomplished by placing the locking member 32 in the positioning groove 41 through the opening of the positioning groove 41 extended to the side surface of the second casing 2, and restricting the rotation of the locking member 32 by the both side groove walls of the positioning groove 41. Furthermore, the displacement and the rotation of the locking part 32 can be limited in a mode that the positioning groove 41 formed in the second box body 2 is matched with the shape of the locking part 32, and compared with other structural schemes for positioning the locking part 32, the scheme is uniform in stress and more suitable for the second box body 2 made of non-metal composite materials.

As shown in fig. 5 and 6, the retaining rib 42 protruding from the groove wall surface is provided on the groove wall of the positioning groove 41, the retaining rib 42 is used for abutting against the side surface of the locking member 32, and the width of the retaining rib 42 is gradually reduced in the direction away from the groove wall of the positioning groove 41.

In this embodiment, the restricting rib 42 has a triangular cross-sectional shape, and the tip of the restricting rib 42 contacts the locking member 32 when the locking member 32 is seated in the positioning groove 41. The provision of the restraint rib 42 makes it possible to preliminarily restrain and position the retaining member 32 placed in the placement groove, and to prevent the retaining member 32 placed therein from falling out. Wherein, restraint muscle 42 adopts the structure that tapers for in the relative screw hole 32a of retaining member 32 of connecting piece 31 the process of screwing up, make retaining member 32 in the process of screwing up, restraint muscle 42 can have a small amount of deformations, thereby make the position of retaining member 32 finely tune, so that the counterpoint of the relative retaining member 32 of connecting piece 31 is connected.

As shown in fig. 4 and 5, on the outer peripheral surface of the second case 2, side wall reinforcing structures 21 are formed in an outwardly extending manner, the side wall reinforcing structures 21 in this embodiment are ribs extending longitudinally for reinforcing the structural strength of the peripheral side of the second case 2 so as to more reliably carry the battery cells, wherein these side wall reinforcing structures 21 further enclose a relatively recessed portion 22 at the outer peripheral surface of the second case 2, and positioning grooves 41 for receiving and positioning the locking members 32 are provided in the recessed portion 22. Through setting up the constant head tank 41 in the depressed part 22, utilize side wall additional strengthening structure 21 to strengthen the protection to retaining member 32 in the constant head tank 41, can reduce the influence that external environmental factor caused to the reliable locking of retaining member 32.

As shown in fig. 3 and 7, in the present embodiment, the connecting plate 5 is not only disposed on the side surface of the second casing 2, but also extends downward and is connected to the bottom surface 23 of the second casing 2, and the connecting plate 5 extends on the bottom surface 23 of the casing to cover the orthographic projection of the inner side edge 24a of the accommodating chamber 24 of the second casing 2 on the bottom surface 23 of the casing. Extend towards box bottom surface 23 through making connection plate 5, strengthen the box bottom surface 23 of second box 2 with the connection plate 5 of utilizing to connect at second box 2, when guaranteeing that second box 2 adopts non-metal composite to promote the thermal insulation performance of battery box, consolidate and protect the battery box weak position, the intensity defect of non-metal composite has been compensatied, the durability of non-metal composite battery box has been promoted, and equal or have the advantage with metal material battery box in the overall quality.

Simultaneously, connect plate 5 and carry out the bearing in the bottom of second box 2 for the bottom of battery box need not to set up extra additional strengthening and carries out the bearing.

As shown in FIG. 3, the second casing 2 includes a second casing outer shell 2a and a second casing inner shell 2b which are stacked, and the end portions of the connecting members 31 penetrate the second casing outer shell 2a and the second casing inner shell 2b, respectively. The second box body 2 is formed by combining an outer shell and an inner shell which are stacked, and the heat preservation effect can be further improved. In this embodiment, the second case outer shell 2a and the second case inner shell 2b are bonded and fixed by gluing, so that the tightness of connection between the second case outer shell and the second case inner shell is improved, and the second case 2 is good in integrity.

The threaded end 31a of the connecting piece 31 sequentially penetrates through the inner shell and the outer shell of the second box body 2, so that the connecting effect of the connecting mechanism 3 on each box body can be improved, and the local damage of the box body caused by local stress is avoided.

In other embodiments, the first box 1 may also be formed into a box structure by combining a first box outer shell and a first box inner shell which are stacked, so as to improve the structural strength and the heat preservation effect of the first box 1.

In addition, can also set up the elastic component on combination box 10, through setting up the elastic component on the combined surface that first box 1 carries out the laminating relative second box 2, make the elastic component can exert the thrust that is reverse in combination direction A to first box 1 and second box 2, this thrust can cooperate with coupling mechanism 3, for the reliable spiro union of the threaded end 31a of retaining member 32 and connecting piece 31 provides the pretightning force, avoid threaded connection relation to produce not hard up in long-term use, influence the close combination of first box 1 and second box 2.

In this embodiment, as shown in fig. 3, the elastic member is embodied as a sealing strip 6, the sealing strip 6 is disposed around the combined surface of the first casing 1 and the second casing 2, and the connecting member 31 further penetrates through the sealing strip 6. The sealing strip 6 can provide pre-tightening force for the connecting mechanism 3 and can also seal the combined box body 10.

In addition, as shown in fig. 3, a turned-down edge 11 is further provided at the edge of the first casing 1, and the turned-down edge 11 extends toward the outer side of the peripheral side of the second casing 2. Through setting up this turn-ups 11 structure, avoid the rainwater along the marginal infiltration composition face of first box 1 and second box 2 and inside the box, realize keeping off the rain purpose.

On this basis, the outside edge of the sealing strip 6 and the edge 25 of the second box body 2 are both abutted to the inner surface of the edge, so that the flanging 11 limits the horizontal position of the sealing strip 6 and the second box body 2, and the flanging 11 is abutted to the edge of the second box body 2, thereby achieving better heat preservation and sealing effects.

In order to further improve the heat preservation sealing effect, a sealing element can be arranged between the connecting element 31 and the first box body 1 or between the locking element 32 and the second box body 2, so that the connection sealing of the connecting element 31 relative to the first box body 1 and the connection sealing of the locking element 32 relative to the second box body 2 are realized.

The battery pack is adopted in the electric automobile, and the combined box body 10 of the battery pack can be reliably connected, so that the requirement on the running reliability of the electric automobile is met.

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 battery pack is 371.5 kg. A non-metal composite battery pack having the same dimensions (external dimensions and internal space dimensions of the battery case) as the metal plate battery pack is prepared.

The metal plate battery pack and the nonmetal composite battery pack are both provided with a battery box formed by combining an upper box cover and a lower box body.

As shown in fig. 8, the upper case cover of the battery case made of the non-metal composite material adopts the first case 1: the upper box cover (the first box body 1) comprises a box cover shell 11, a heat insulation layer 12 and a protection layer 13, wherein the heat insulation layer 12 and the protection layer 13 are sequentially covered and fixed on one side of the box cover shell 11 facing the lower box body (the second box body 2). And case lid shell 11 adopts SMC material compression molding, and light flexible insulating layer 12 adopts the aerogel felt of 5mm thick, and the material of protective layer 13 is fire prevention cloth, all adopts the mode of structural adhesive bonding connection to be connected between case lid shell 11 and the light flexible insulating layer 12 and between insulating layer 12 and the protection thin layer to set up concave-convex structure 11a at case lid shell 11 in order to increase intensity.

As shown in fig. 9, the second case 2 of the above embodiment is used as the lower case of the battery case made of a non-metallic composite material. This lower box (second box 2) is including stacking the shell body (second box shell 2a) and the interior casing (second box inner shell 2b) that sets up, and the outside extension of shell body lateral wall forms side wall additional strengthening structure 21, side wall additional strengthening structure 21 sets up the depressed part 22 and realizes losing weight when guaranteeing intensity, be provided with vertically and horizontally staggered's strengthening rib 2c between interior casing and the shell body, strengthening rib 2c is formed at the upper surface of shell body (and the surface of interior casing on the shell body), and realize connecting in interior casing through bonding, separate into a plurality of cavities through strengthening rib 2c between with interior casing and the shell body, form cavity structures. The height of the chamber structure between the outer and inner housings (i.e. the distance between the facing surfaces of the outer and inner housings) was 5mm, and both the outer and inner housings were molded from SMC.

The lower box that forms when not placing the aerogel in the cavity structures is box A under the non-metallic composite, the lower box that forms when placing the aerogel in the cavity structures is marked as box B under the non-metallic composite, box A and non-metallic composite adopt the mode and the last case lid combination of buckle lock respectively under the non-metallic composite, form non-metallic composite battery box, mark non-metallic composite battery box A and non-metallic composite battery box B respectively, pack into respectively and form non-metallic composite battery package A and non-metallic composite battery package B behind battery module and the necessary electrical component.

The upper box cover and the lower box body are sealed in a U-shaped sealing mode, a concave part is arranged on the side face of the upper box cover and matched with a convex part arranged on the side face of the lower box body to form a buckle connection, and the upper box cover and the lower box body are subjected to one-step mould pressing to realize the buckling of a 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 60.4 kg. Compared with a box body made of a metal plate material, the weight of the box body B made of a nonmetal composite material is reduced by 25.5%. 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 metal plate 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 the strength test, box A under the non-metal composite material and box B under the non-metal composite material to and be used for forming the non-metal composite material upper cover of the non-metal battery box of combined material with the two and all satisfy GB/T31467.3-2015 lithium ion power battery package and system part 3 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 cores of the non-metal composite battery pack A and the non-metal composite battery pack B are filled with the heat-conducting glue (the filling height of the heat-conducting glue is about 1/3 of the battery height), so that the temperature uniformity between the battery cores is improved, and 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 battery pack, in the same environment and when the battery pack is charged with a charging current of 40A (SOC is from 0 to 100%), the accumulated temperature of the sheet metal battery pack is increased by more than 5 ℃ compared with that of the non-metal battery pack B, the charging capacity of the non-metal battery pack B is increased by more than 5% compared with that of the sheet metal battery pack, and the uniformity of the maximum temperature difference (obtained by recording the temperatures of all positive and negative lugs) in the box body of the composite 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:

the 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-,the impact toughness is more than or equal to 55KJ/m ² (GB/T1451-.

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. A combination box of battery box, its characterized in that, combination box includes:

2. The battery box assembly of claim 1 wherein the retaining member is positioned on the second box by a mounting structure that limits rotation of the retaining member.

3. The built-up case of battery box according to claim 2, wherein the mounting structure includes a positioning groove formed in the second case, the positioning groove extending to a side surface of the second case in a direction perpendicular to the built-up direction and forming an opening, the locking member being received in the positioning groove and being restricted in rotation by both side groove walls of the positioning groove.

4. The battery box assembly as claimed in claim 3, wherein the groove walls of the positioning groove have constraining ribs protruding from the surfaces of the groove walls, the constraining ribs are configured to abut against the locking member, and the width of the constraining ribs decreases in a direction away from the groove walls.

5. The battery box assembly as claimed in claim 3, wherein the second box body has a side wall reinforcing structure extending outwardly from an outer peripheral surface thereof, the side wall reinforcing structure having a plurality of recesses recessed toward the outer peripheral surface of the second box body, and the positioning grooves are formed in the recesses.

6. The built-up box of a battery box according to claim 3, further comprising a connection plate provided at least at a side surface of the second box and covering an opening of the positioning groove at the side surface of the second box.

7. The built-up case of battery box according to claim 6, characterized in that the connecting plate member is provided around the entire side surface of the second case along the peripheral side of the second case.

8. The combined box body of the battery box as claimed in claim 6, wherein the second box body is a lower box body, the connecting plate further extends and is connected with the bottom surface of the second box body, and the connecting plate extends to cover the orthographic projection of the inner edge of the accommodating cavity of the second box body on the bottom surface of the box body.

9. The assembled box of a battery box according to any one of claims 1 to 8, wherein the first box comprises a first box outer casing and a first box inner casing which are arranged one on top of the other, and ends of the connecting member penetrate the first box outer casing and the first box inner casing, respectively;

10. The battery box assembly as claimed in any one of claims 1 to 8, wherein the connecting member is a bolt, the locking member includes a nut, and the threaded end of the connecting member is engaged with the thread of the locking member.

11. The built-up body of battery box according to any one of claims 1 to 8, characterized in that it further comprises an elastic member which is located on a built-up surface of the first body and the second body and applies a pushing force to the first body and the second body against a built-up direction.

12. The assembled box body of the battery box as claimed in claim 11, wherein the elastic member is a sealing strip, the sealing strip is disposed around the assembly surface of the first box body and the second box body, and the connecting member further penetrates through the sealing strip.

13. The battery box assembly as claimed in claim 12, wherein the first box is an upper box, and the first box has a flange at an edge thereof, the flange extending outwardly of the peripheral side of the second box.

14. The battery box combination of claim 13, wherein the outer edge of the sealing strip abuts against the inner surface of the flange;

and/or the edge of the second box body is propped against the inner surface of the flanging.

15. The battery box assembly as claimed in any one of claims 1 to 8, wherein a sealing member is provided between the connector and the first box; and/or a sealing piece is arranged between the locking piece and the second box body.

16. A battery pack, comprising:

a battery cell;

the built-up case of any one of claims 1 to 15, wherein the battery unit is disposed in a space defined by the first case and the second case.

17. An electric vehicle characterized by comprising the battery pack according to claim 16.