CN209447877U - A kind of battery module, battery pack and vehicle - Google Patents

Abstract

The utility model relates to energy storage device technical fields, disclose a kind of battery module, battery pack and vehicle, battery module includes the multiple battery cells arranged in the horizontal direction, battery cell includes electrode assembly and battery case, electrode assembly is contained in the battery case, and electrode assembly includes the first pole piece, the second pole piece and the diaphragm being set between the first pole piece and the second pole piece；Wherein, the size of battery module in the horizontal direction is greater than the size of battery module along the vertical direction；Electrode assembly be takeup type structure and be it is flat, the outer surface of the electrode assembly includes two flat horizontal surfaces, and two flat horizontal surfaces face each other along the vertical direction；Or, electrode assembly is laminated structure, the first pole piece, diaphragm and the second pole piece are vertically stacked.The utility model can effectively reduce the dilatancy amount of battery module.

Description

A kind of battery module, battery pack and vehicle

Technical field

The utility model relates to energy storage device technical fields, more particularly to a kind of battery module, battery pack and vehicle.

Background technique

Secondary cell has many advantages, such as that energy density is big, and long service life, energy conservation and environmental protection are widely used in new energy vapour The different fields such as vehicle, energy-accumulating power station.

When in use, it will usually multiple battery cells be stacked and be electrically connected to each other by busbar connector, battery module is formed. In order to fix multiple battery cells, end plate and side plate would generally be set in battery module, end plate and side plate are interconnected to form Module frame, multiple battery cells are fixed in module frame.

Since battery cell can expand deformation in use, and dilatancy is in the longest ruler of battery module It is particularly evident on very little direction.Therefore, in order to limit battery cell expansion, the volume of existing battery module end plate is larger, thus Cause the energy density of battery module relatively low, and is unfavorable for battery module lightweight.

Utility model content

For this reason, it may be necessary to a kind of battery module be provided, for solving in above-described battery module because battery cell expands Caused by the big technical problem of module deflection.

To achieve the above object, a kind of battery module is inventor provided, the battery module includes arranging in the horizontal direction Multiple battery cells of column and the multiple busbar connectors being electrically connected with the multiple battery cell, the battery cell includes electrode Component and battery case, the electrode assembly are contained in the battery case, and the electrode assembly includes the first pole piece, second Pole piece and the diaphragm being set between first pole piece and second pole piece；

Wherein, the size of the battery module in the horizontal direction is greater than the size of the battery module along the vertical direction；

The electrode assembly be takeup type structure and be it is flat, the outer surface of the electrode assembly includes two flat Face, two flat horizontal surfaces are faced each other along the vertical direction；Or, the electrode assembly be laminated structure, described first Pole piece, the diaphragm and second pole piece are laminated along the vertical direction.

Further, the battery case includes two first surfaces and two second surfaces, the face of the first surface Product is greater than the area of the second surface；Described two second surfaces in each battery cell are along the horizontal direction phase It mutually faces, described two first surfaces in each battery cell are faced each other along the vertical direction.

Further, the battery cell has multiple electrode assemblies, and multiple electrode assemblies are along described vertical Direction stacks.

Further, in the battery module, the number of plies of the battery cell stacked along the vertical direction is 1-5 Layer.

Further, in the battery module, along the vertical direction stack the battery cell the number of plies be 2 layers or 3 layers.

Further, the battery case further includes third surface, two first surfaces and two second tables Face surrounds third surface jointly；The area of the first surface is greater than the area on the third surface.

Further, the battery cell further includes first electrode terminal and second electrode terminal, the first electrode end The sub and described second electrode terminal is all set in the third surface.

Further, further includes:

Band, surrounds the periphery of the multiple battery cell, and the band includes two long sides and two short sides, the length Side and the first surface face each other and extend along the horizontal direction, the short side and the second surface face each other and Extend along the vertical direction.

Further, including at least two bands, the band are spaced apart.

Further, the band has first end and the second end, the first end and the second end edge To form joint portion, the joint portion is faced each other with the first surface for the vertical direction stacking；Alternatively, the band tool There are first end and the second end, the first end and the second end are laminated to form engagement along the horizontal direction Portion, the joint portion are faced each other with the second surface.

Further, the joint portion of at least two bands is arranged in a linear.

Further, further includes:

Two end plates are respectively arranged at the both ends along the horizontal direction of the multiple battery cell；The band packet Enclose the periphery of the multiple battery cell and described two end plates.

Further, the surface far from the battery cell of the end plate is provided with band limiting slot, the band limit Position slot extends along the vertical direction, and the short side of the band is contained in the band limiting slot；Alternatively, the end plate It is internally provided with band limit hole, the band limit hole extends along the vertical direction, and the short side of the band passes through described Band limit hole.

Further, the size of the battery module in the horizontal direction and the size of the battery module along the vertical direction Ratio is greater than or equal to 4.

In order to solve the above technical problems, the utility model additionally provides another technical solution:

A kind of battery pack, comprising:

Cabinet has accommodating cavity；And

Battery module described in multiple any of the above item technical solutions, multiple battery modules are located at the accommodating cavity It is interior.

In order to solve the above technical problems, the utility model additionally provides another technical solution:

A kind of vehicle, comprising:

Vehicle body；And battery pack, the battery pack are set to the vehicle body, the battery pack is any of the above Battery pack described in technical solution.

It (is being wound since thickness direction of the electrode assembly in charge and discharge process inevitably along pole piece expands It is maximum along the direction expansive force perpendicular to flat horizontal surface in the electrode assembly of formula structure；In the electrode assembly of laminated structure, edge The stacking direction expansive force of first pole piece and the second pole piece is maximum).And in the prior art, in the battery cell of battery module, The direction that electrode assembly applies maximum swelling power to battery case is all directed towards horizontal direction.Since battery module is along level More big compared to the size of vertical direction of the size in direction (for example, the chassis height size by vehicle is limited, need more More battery cells stack in the horizontal direction, and expansive force accumulation is big), therefore, what existing battery module was subject in the horizontal direction Expansive force is very big, it is therefore desirable to very thick end plate is set to resist expansive force in the horizontal direction two sides of battery module, and End plate thickeies the energy density that can reduce battery module.And in above scheme, electrode assembly can select takeup type structure or Laminated structure.When electrode assembly is takeup type structure, flat horizontal surface is towards vertical direction.When electrode assembly is laminated structure When, the first pole piece and the second pole piece are vertically stacked.As it can be seen that electrode assembly either uses takeup type structure still to use Laminated structure, electrode assembly apply the direction of maximum swelling power both facing to vertical direction to battery case.Due to electrode assembly The direction for applying maximum swelling power to battery case is directed towards vertical direction, and the battery cell number stacked on vertical direction compared with It is few.Therefore, compared with the prior art, above scheme can reduce the maximum swelling power of battery module, therefore volume can be selected more Small end plate, to improve the energy density of battery module.

Detailed description of the invention

Fig. 1 is the explosive view of battery pack described in specific embodiment；

Fig. 2 is the sectional view of battery module and cabinet bonding in battery pack described in specific embodiment；

Fig. 3 is the partial enlarged view of part A in Fig. 2.

Fig. 4 is the schematic diagram of battery module described in specific embodiment；

Fig. 5 is the structural schematic diagram of battery cell described in specific embodiment；

Fig. 6 is the explosive view of battery cell described in specific embodiment；

Fig. 7 a be specific embodiment described in takeup type structure electrode assembly along Fig. 3 D-D to cross-sectional view；

Fig. 7 b be specific embodiment described in takeup type structure electrode assembly along Fig. 3 appearance profile of the D-D to section Schematic diagram；

Fig. 8 be specific embodiment described in laminated structure electrode assembly along Fig. 3 D-D to cross-sectional view；

Fig. 9 is the schematic diagram of battery module described in specific embodiment；

Figure 10 is the explosive view of battery module described in Fig. 9；

Figure 11 is the structural schematic diagram of end plate described in specific embodiment；

Figure 12 is the structural schematic diagram of end plate described in specific embodiment；

Figure 13 is the sectional view at band head and the tail joint portion described in specific embodiment；

Description of symbols:

100, battery module；

1, battery cell；

11, electrode assembly；

12, battery case；

13, cover plate assembly；

131, first electrode terminal；

132, second electrode terminal；

14, switching piece；

111, the first pole piece；

112, the second pole piece；

113, diaphragm；

114, flat horizontal surface；

115, leptoprosopy；

110, first surface；

120, second surface；

130, third surface；

2, end plate；

21, end plate main body portion；

22, band limiting slot；

23, fixed fixing limit hole；

24, the first protrusion；

200, battery pack；

20, cabinet；

210, upper box lid；

220, lower box；

220-1, the second protrusion；

230, glue；

240, glue；

250, accommodating cavity；

3, band；

31, long side；

32, short side；

310, first end；

320, the second end；

330, joint portion；

4, insulating part；

5, busbar connector；

Specific embodiment

Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality It applies example and attached drawing is cooperated to be explained in detail.

In the description of the present application unless specifically defined or limited otherwise, term " first ", is only used for retouching " second " The purpose stated, is not understood to indicate or imply relative importance；Unless otherwise prescribed or explanation, term " multiple " refer to two More than a；Term " connection ", " fixation " etc. shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can Dismantling connection, or be integrally connected, or electrical connection；It can be directly connected, it can also be indirectly connected through an intermediary.For For those skilled in the art, can understand as the case may be above-mentioned term in the present invention specifically contain Justice.

In the description of the present application, arrow A direction is length direction in all attached drawings, and arrow B direction is width Direction is spent, arrow C direction is vertical direction.Horizontal direction is to be parallel to the direction of horizontal plane, either above-mentioned length Direction is also possible to above-mentioned width direction.In addition, horizontal direction not only includes the absolute parallel direction in horizontal plane, also include The direction for being roughly parallel to horizontal plane of conventional cognitive in engineering.Vertical direction is the direction perpendicular to horizontal plane, vertical direction Not only include absolute upright in the direction of horizontal plane, also includes the side for being approximately perpendicular to horizontal plane of conventional cognitive in engineering To.In addition, the nouns of locality such as "upper" described herein, "lower", "top", "bottom" are understood relative to vertical direction 's.

In one embodiment, a kind of vehicle is provided, the vehicle includes vehicle body and battery pack, the battery pack It is set to the vehicle body, battery pack is battery pack 200 shown in FIG. 1.Wherein, vehicle is new-energy automobile, can be Pure electric automobile can also be provided with driving motor in vehicle body with hybrid vehicle or extended-range automobile, driving motor with Battery pack electrical connection provides electric energy by battery pack, and driving motor is connect by transmission mechanism with the wheel on vehicle body, thus Automobile is driven to advance.Preferably, battery pack can be horizontally placed on the bottom of vehicle body.

As shown in Figure 1, for the structural schematic diagram of battery pack 200 in an embodiment, battery pack 200 includes cabinet 20 and multiple Battery module 100, wherein cabinet 20 includes lower box 210 and upper box lid 220, in Fig. 1, the upper box lid 220 of battery pack 200 with Lower box 210 is in separated position.

Wherein, lower box 210 and upper box lid 220 cooperatively form the closed case with accommodating cavity 250, multiple battery modules 100 are located in accommodating cavity 250.Wherein, cabinet 20 can be made of aluminium, aluminium alloy or other metal materials.Multiple battery modules 100 can be arranged side by side along the length direction of battery pack 200, and multiple battery modules 100 can also be along the width side of battery pack 200 To be arranged side by side.Battery module 100 has multiple battery cells 1, and multiple battery cells 1 in battery module 100 can lead to It crosses band 3 to surround together, wherein a battery module 100 may be provided with more than two bands 3, and band includes two long Side 31 and two short sides 32, wherein long side 31 extends in the horizontal direction (for example, length direction of arrow A meaning), 32 edge of short side Vertical direction (direction of arrow C meaning) extends.

As shown in Fig. 2, in one embodiment, being provided between the top of battery module 100 and the upper box lid 220 of cabinet 20 Glue 230 is provided with glue 240, therefore passes through glue 230 and glue between the bottom of battery module 100 and the lower box 210 of cabinet 20 240 connect battery module 100 with cabinet 20.

Wherein, glue 230 and glue 240 can be set between the long side 31 of two bands adjacent on battery module 100, lead to The long side 31 for crossing two bands 3 can limit the outside overflow when not solidifying of glue 230 and glue 240, it is ensured that glue 230 and battery module 100 top and the bottom and lower box 210 of upper box lid 220 effectively bonding and glue 240 and battery module 100 are effective Bonding.

Battery module 100 is connected by glue 230, glue 240 with cabinet 20, and battery module 100 and cabinet 20 is made to form one A entirety strengthens the bonding strength between cabinet 20 and battery module 100, therefore improves the overall stiffness of battery pack.

In one embodiment, the surface of band 3 is contacted with the first surface 110 of battery cell 1, the interior table of upper box lid 220 Face is contacted with another surface of band 3, is in close contact upper box lid 220, band 3 and 1 three of battery cell.It is located at two in this way The glue in space that the long side 31 of a adjacent band 3, the upper surface 110 of battery cell 1 and 220 inner surface of upper box lid are surrounded 230 thickness with a thickness of band 3, to accurately control the thickness of glue 230.Similarly, positioned at the bundle of 1 bottom of battery cell Long side 31 with 3 can also make the glue positioned at 1 bottom of battery cell with the intimate surface contact of lower box 210 and battery cell 1 240 thickness can also be equal with the thickness of band 3.

As shown in figure 3, for office's enlarged drawing of part A in Figure 12, wherein the inner surface on upper box lid 220 be provided with to Under the second protrusion 220-1, the second protrusion 220-1 it is Nian Jie with glue 230.Wherein, the second protrusion 220-1 is located at adjacent Between the long side 31 of two bands 3, i.e. the second protrusion 220-1 is protruded to 230 position of glue.Second protrusion 220-1's There are the spaces for accommodating glue 230 between end and the upper surface of battery cell 1, and the thickness of glue 230 is made to be less than the thickness of band 3 in this way Degree.The second protrusion 220-1 on upper box lid 220 can be formed by mould punching, i.e., by mold towards the upper surface of upper box lid 220 Punching press keeps the upper surface of upper box lid 220 downwardly convex to recessed and lower surface.In other embodiments, the second protrusion 220-1 can be by being arranged reinforced sheet or stiffener realization in the upper surface of upper box lid 220.Inner surface setting on upper box lid 220 On the one hand second protrusion 220-1 can increase the structural strength of upper box lid 220, on the other hand the second protrusion 220-1 is to glue 230 positions protrusion, can by glue 230 downwards and two sides squeeze, connect glue 230 sufficiently with battery cell 1 and band 3 Touching, it is ensured that the adhesive strength between glue 230 and battery cell 1 and band 3.

Referring to Fig. 4, providing a kind of structural schematic diagram of battery module；Fig. 5 provides the stereochemical structure of battery cell Schematic diagram；Fig. 6 provides the explosive view of battery cell；Fig. 7 a provide coiled electrode assemblies along Fig. 3 D-D to section view Figure；Fig. 7 b provides the takeup type structure electrode component profile outline of D-D to section along Fig. 3；Fig. 8 is laminated structure electricity Pole component along Fig. 3 D-D to cross-sectional view.

As shown in figure 4, battery module 100 include multiple battery cells 1 for arranging in the horizontal direction and with it is the multiple Multiple busbar connectors 5 that battery cell 1 is electrically connected.Wherein, battery cell 1 is the secondary cell that repeatable charge and discharge use, multiple Battery cell 1 realizes series, parallel or mixed connection by busbar connector 5.Wherein, the size L of battery module 100 in the horizontal direction is greater than The size H of the battery module along the vertical direction.

As shown in Figure 5 and Figure 6, battery cell 1 include battery case 12 and electrode assembly 11, battery case 12 can by aluminium, The metal materials such as aluminium alloy or nickel-plated steel are made, and battery case 12 can have hexahedral shape or other shapes, and have opening. Electrode assembly 11 is contained in battery case 12.The opening of battery case 12 is covered with cover plate assembly 13.Cover plate assembly 13 includes Cover board and two electrode terminals being set on cover board, two electrode terminals are respectively first electrode terminal 131 and second electrode Terminal 132.Wherein, first electrode terminal 131 can be positive electrode terminal, and second electrode terminal 132 is negative electrode terminal.At it In his embodiment, first electrode terminal 131 can also be negative electrode terminal, and second electrode terminal 132 is positive electrode terminal. Cover board can be made of metal materials such as aluminium, aluminium alloys, and the size of cover board is adapted with the size of the opening of battery case 12.Electricity Extreme son can be fixed on cover board by welding or by fixing pieces such as rivets.It is set between cover plate assembly 13 and electrode assembly 11 It is equipped with switching piece 14, the tab of electrode assembly 11 is electrically connected by switching piece 14 with the electrode terminal on cover board.In the present embodiment, There are two switching pieces 14, that is, is respectively positive switching piece and cathode switching piece.

In Fig. 6, setting is there are two electrode assembly 11 in battery case 12, two electrode assemblies 11 (arrow C along the vertical direction Signified direction) it stacks.Certainly, in other embodiments, it may also set up an electrode assembly 11 in battery case 12, or Person is arranged there are three above electrode assembly 11 in battery case.(arrow C is signified along the vertical direction for multiple electrodes component 11 Direction) it stacks.

As shown in Fig. 7 a, Fig. 7 b and Fig. 8, electrode assembly 11 includes the first pole piece 111, the second pole piece 112 and is set to Diaphragm 113 between first pole piece 111 and second pole piece 112.Wherein, the first pole piece 111 can be positive plate, the Two pole pieces 112 are negative electrode tab.In other examples, the first pole piece 111 can also be negative electrode tab, and second electrode is anode Piece.Wherein, diaphragm 113 is the insulator between the first pole piece 111 and the second pole piece 112.The active material of positive plate can It is applied on the coating area of positive plate, the active material of negative electrode tab can be applied on the coating area of negative electrode tab.By positive plate The part extended of coating area be then used as positive pole ear；The part extended by the coating area of negative electrode tab is then used as cathode pole Ear.Positive pole ear is connected to the positive electrode terminal on cover plate assembly 13 by positive switching piece, and similarly, negative lug passes through negative Pole switching piece is connected to the negative electrode terminal on cover plate assembly 13.

As shown in Figure 7a, wherein electrode assembly 11 is takeup type structure.Wherein, the first pole piece 111, diaphragm 113 and Two pole pieces 112 are banded structure, and the first pole piece 111, diaphragm 113 and the second pole piece 112 are stacked gradually and wind two circles Electrode assembly 11 formed above, and electrode assembly 11 is in flat.When electrode assembly 11 makes, electrode assembly 11 can be rolled up first It is coiled into hollow cylindrical structure, it is flat for flattening again after winding.Fig. 7 b is the appearance profile schematic diagram of electrode assembly 11, The outer surface of electrode assembly 11 includes two flat horizontal surfaces 114, and two flat horizontal surfaces 114 are along the vertical direction (direction of arrow C meaning) It faces each other, i.e. flat horizontal surface 114 and the first surface 110 of battery case 12 is oppositely arranged.Wherein, electrode assembly 11 substantially six Face body structure, flat horizontal surface 114 are roughly parallel to winding axis and are the maximum outer surface of area.Flat horizontal surface 114 can be relatively Even curface, it is not required that be pure-surface.For two flat horizontal surfaces 114 are the leptoprosopy 115 of 11 two sides of comparative electrode component, And the area of flat horizontal surface 114 is greater than the leptoprosopy 115 of electrode assembly 11.

As shown in Figure 8, wherein electrode assembly 11 is laminated structure, i.e., has multiple first pole pieces in electrode assembly 11 111 and multiple second pole pieces 112, diaphragm 113 is arranged between the first pole piece 111 and the second pole piece 112.First pole piece 111, Diaphragm 113, the second pole piece 112 are cascading.Wherein, the first pole piece 111, diaphragm 113 and the second pole piece 112 are along vertical side To stacking (direction of arrow C meaning).

It (is being rolled up since thickness direction of the electrode assembly 11 in charge and discharge process inevitably along pole piece expands It is maximum along the direction expansive force perpendicular to flat horizontal surface 114 in the electrode assembly 11 of wound structure；In the electrode group of laminated structure It is maximum along the stacking direction expansive force of the first pole piece 111 and the second pole piece 112 in part 11).

In the prior art, in the battery cell 1 of battery module 100, electrode assembly 11 applies maximum to battery case 12 The direction of expansive force is all directed towards horizontal direction.Due to battery module 100 in size in the horizontal direction compared to vertical direction Big more of size (for example, the chassis height size by vehicle is limited, need more battery cells 1 in the horizontal direction Stack, expansive force accumulation is big), therefore, the expansive force that existing battery module 100 is subject in the horizontal direction is very big, therefore needs Very thick end plate is set to resist expansive force in the horizontal direction two sides of battery module 100, and end plate thickening can reduce electricity The energy density of pond module 100.And in the present embodiment, electrode assembly 11 can select takeup type structure or laminated structure. When electrode assembly 11 is takeup type structure, flat horizontal surface 114 is towards vertical direction.When electrode assembly is laminated structure, the One pole piece 111 and the second pole piece 112 are vertically stacked.As it can be seen that electrode assembly 11 either uses takeup type structure still Using laminated structure, electrode assembly 11 applies the direction of maximum swelling power both facing to vertical direction to battery case 12.

Since electrode assembly 11 is directed towards vertical direction to the direction that battery case 12 applies maximum swelling power, and it is vertical square 1 number of the battery cell stacked upwards is less.Therefore, compared with the prior art, present embodiment can reduce battery module 100 Maximum swelling power, therefore can be selected the smaller end plate of volume, to improve the energy density of battery module 100.

As shown in figure 4, in battery module 100, battery cell 1 stacks along the vertical direction (direction of arrow C meaning) The number of plies is 2 layers.And in other embodiments, the number of plies of the battery cell 1 stacked along the vertical direction can be 1-5 layers.It is preferred that Ground, the number of plies of the battery cell 1 stacked along the vertical direction are 2 layers or 3 layers.

It is in one embodiment, electric in order to which better balancing battery module 100 is in the horizontal direction with the expansive force of vertical direction The ratio of the size of pond module 100 in the horizontal direction and the size of battery module 100 along the vertical direction is greater than or equal to 4.

As shown in Figure 5 and Figure 6, the substantially hexahedron structure of battery case 12 of battery cell 1, battery case 12 include two A first surface 110 and two second surfaces 120.Two second surfaces 120 in each battery cell 1 (example in the horizontal direction Such as, the length direction of arrow A meaning) it faces each other, (the arrow along the vertical direction of two first surfaces 110 in each battery cell 1 The direction of head C meaning) it faces each other.It wherein, can be by right angle transition, equally between first surface 110 and second surface 120 Ground can also pass through circular arc camber or the surface blending of multiple bending between first surface 110 and second surface 120.Preferably, The area on one surface 110 is greater than the area of the second surface 120.

Since battery cell 1 can also generate gas, the gas meeting of generation in charge and discharge process inside battery case 12 Active force is applied to battery case 12, is expanded outward to aggravate battery case 12.Due to the first surface 110 of the present embodiment Area is greater than the area of second surface 120, and two first surfaces 110 in battery cell 1 face each other along the vertical direction, Therefore the direction that the gas generated applies maximum force to battery case 12 is also directed towards vertical direction.Compared to existing skill Art further reduces the maximum swelling power of battery module 100.

As shown in Figure 5 and Figure 6, battery case 12 further includes third surface 130, two first surfaces 110 and two second Surface 120 surrounds third surface 130 jointly, and the area of first surface 110 is greater than the area on third surface 130.I.e. first Surface 110, second surface 120 and third surface 130 are substantially perpendicular between any two, and are interconnected to form accommodate electrod group The cavity of part 11.Wherein, first surface 110 is towards vertical direction, and the area of first surface 110 is greater than second surface 120 Or the area on third surface 130.Second surface 120 and the area on third surface 130 can be equal, be also possible to second surface 120 area is more than or less than the area on third surface 130.

In the embodiment of battery pack, since glue 230 and glue 240 are set between battery module 100 and upper box lid 1, And the maximum swelling power direction of battery module 100 is directed towards vertical direction, therefore can make battery module 100 and glue 230 What is be bonded between glue 240 is closer, prevents glue 230 and glue 240 from falling off.

As shown in figure 5, the first electrode terminal 131 and second electrode terminal 132 on battery cell 1 can be set in battery On the third surface 130 of shell 12, therefore the busbar connector 5 connecting with electrode terminal is located at the battery list where third surface 130 The side of body 1.Since battery module 100 is more valuable relative to the space in other directions in the space of vertical direction, and will converge Stream row is set to the side of first surface 130, can make full use of the space of 100 side of battery module, reduces by 100 edge of battery module The size of vertical direction.Especially when battery module 100 is applied on automobile, (battery module 100 is generally disposed at automobile Bottom), the size along the vertical direction by reducing battery module 100 can increase the liftoff spacing of bottom of car, favorably mention Rise the obstacle climbing ability of automobile.

As shown in Figure 9 and Figure 10, in one embodiment, battery module 100 includes band 3, and band 3 surrounds multiple batteries The periphery of monomer 1, and head and the tail link together, to tying up multiple battery cells 1 around together.Wherein, band 3 can be by The materials such as nylon, polypropylene or polyvinyl chloride are made, and have good flexibility, band along multiple battery cells 1 surround from And form two long sides 31 and two short sides 32.Wherein, long side 31 and first surface 110 face each other and (arrow in the horizontal direction The length direction of head A meaning) extend, short side 32 and second surface 120 face each other and along the vertical direction (arrow C direction) Extend.Since the expansive force of battery module 100 (for example, length direction of arrow A meaning) in the horizontal direction is smaller, to electricity The intensity requirement of the fixed structure of pond monomer 1 also decreases, by band 3 can by battery module 100 in battery cell 1 It bundles.In other embodiments, battery module 100 can be fixed by modes such as press strip, side plate or bolts. And in the present embodiment, band 3 have many advantages, such as light weight, occupancy it is small in size, pass through band 3 and surround the outer of battery cell 1 Week, compared to the lightweight that other modes are more advantageous to battery module 100.

Optionally, battery module 100 is provided at least two bands 3, (arrow B institute in the width direction between adjacent band 3 Finger direction) it is spaced apart.In other embodiments, the quantity of band 3 can be one.

As shown in Figure 9 and Figure 10, in the present embodiment, battery module 100 further includes two end plates 2, and two end plates 2 are distinguished The both ends of (for example, the length direction of arrow A meaning) in the horizontal direction of multiple battery cells 1 are set to, band 3 surrounds multiple The periphery of battery cell 1 and two end plates 2, i.e. band 3 surround two end plates 2 and multiple battery cells 1 together.End Plate 2 can be made of metal materials such as aluminium, aluminium alloys, can also be made up of high molecular materials such as plastics of plastic process.Such as Shown in Figure 10, in the present embodiment, battery module 100 further includes insulating part 4, and insulating part 4 can be by insulating materials such as rubber, silica gel It is made, insulating part 4 includes at least the first face and the second face, wherein the first face and the second face are at vertical relation.Insulating part 4 is arranged In the bottom at the both ends along its length of battery module 100, the first face is opposite with the side of battery cell 1 of end is located at, the Two faces are opposite with the bottom surface of battery cell 1.Band 3 surround end plate 2, battery cell 1 and insulating part 4 periphery, make end plate 2, Battery cell 1 and insulating part 4 are combined together.Insulating part 4 not only plays the role of insulating protection, but also can prevent battery cell 1 is tied tight by 3 part of band and unbalance stress occurs.

Such as the structural schematic diagram that Figure 11 is an embodiment end plates 2, end plate 2 includes end plate main body portion 21, band limiting slot 22 and first protrusion 24, wherein band limiting slot 22 is set to the outer surface of end plate 2, by the inside spill in the outer surface of end plate 2 At band limiting slot 22 extends along the vertical direction.Band 3 passes through band limiting slot 22, so that the short side 32 of band 3 is contained in bundle In band limiting slot 22.Band 3 surrounds the periphery of multiple battery cells 1 and end plate 2, wherein the width and bundle of band limiting slot 22 32 width of short side with 3 is suitable, so as to limit the position of band 3.

As shown in figure 12, be another embodiment end plates 2 structural schematic diagram, with Fig. 8 the difference is that, in end plate 2 It is upper setting 23 alternate figures 8 of band limit hole in band limiting slot 22, wherein band limit hole 23 be located inside end plate 2 without It is surface, likewise, band limit hole 23 is also to extend along the vertical direction, the short side 32 of band 3 passes through band limit hole 23.It pricks Width with limit hole 23 is suitable with 32 width of short side of band 3, and band 3 surrounds the periphery of multiple battery cells 1 and end plate 2.

In the end plate 2 shown in Figure 11 and Figure 12, the first protrusion 24 is set to the top of main part 21, the first protrusion 24 protrude from the upper surface of battery module 100 and are located between the long side 31 of two adjacent bands 3.Therefore, on two end plates 2 The long side 31 of the first protrusion 24 and two adjacent bands 3 surround a groove at the top of battery module 100.Such as Figure 12 It is shown, in some embodiments, it can be connect by glue 230 with upper box lid 220 at the top of battery module 100, and the first protrusion 24 It can be used for accommodating the glue 230 with the surrounded groove of long side 31 of band 3, and not solidified glue can be limited, Not solidified glue is prevented to be lost.

It as shown in figure 13, is the sectional view at 3 head and the tail joint portion of band, wherein band 3 has first end 310 and second (wherein, first end 310 and the second end 320 refer respectively to one end and another when band 3 is not connected with from beginning to end for end 320 End), first end 310 and the second end 320 are vertically stacked to form joint portion 330, so that the joint portion of band 3 330 face each other with the first surface 110 of battery cell 1, i.e. the top that is located at battery module 100 of joint portion 330.Wherein, it pricks With 3 first end 310 and the second end 320 can be made by way of hot pressing surface both melt after link together, Certainly in other embodiments, first end 310 and the second end 320 can also be linked together by glue or fixing glue.

And in further embodiments, first end 310 and the second end 320 are in the horizontal direction (for example, arrow A is signified Length direction) stacking to form joint portion 330, joint portion 330 faces each other with 1 second surface 120 of battery cell, that is, engages Portion 330 is located at the end in the horizontal direction of battery module 100.

In some embodiments, battery module 100 has two or more bands 3, and the joint portion 330 of each band 3 is along width Spend direction (i.e. the direction of arrow B meaning) arrangement.Since shape is laminated by first end 310 and the second end 320 in engaging portion 330 At, therefore the thickness of engaging portion 330 can be greater than the thickness of 3 rest part of band.Since the joint portion 330 of each band 3 is linear Arrangement (arranges and substantially on same straight line) in the width direction, therefore convenient for escape groove is arranged on cabinet 20, thus Prevent extruding of the battery cell 1 in 330 position of engaging portion by cabinet 20.

Claims (16)

1. a kind of battery module, which is characterized in that the battery module include multiple battery cells for arranging in the horizontal direction with And the multiple busbar connectors being electrically connected with the multiple battery cell, the battery cell include electrode assembly and battery case, institute It states electrode assembly to be contained in the battery case, the electrode assembly is including the first pole piece, the second pole piece and is set to institute State the diaphragm between the first pole piece and second pole piece；

Wherein, the size of the battery module in the horizontal direction is greater than the size of the battery module along the vertical direction；

The electrode assembly be takeup type structure and be it is flat, the outer surface of the electrode assembly includes two flat horizontal surfaces, two A flat horizontal surface is faced each other along the vertical direction；Or, the electrode assembly be laminated structure, first pole piece, The diaphragm and second pole piece are laminated along the vertical direction.

2. battery module according to claim 1, which is characterized in that the battery case includes two first surfaces and two A second surface, the area of the first surface are greater than the area of the second surface；It is described in each battery cell Two second surfaces are faced each other along the horizontal direction, and described two first surfaces in each battery cell are described in Vertical direction faces each other.

3. battery module according to claim 1, which is characterized in that the battery cell has multiple electrode groups Part, multiple electrode assemblies are stacked along the vertical direction.

4. battery module according to claim 1, which is characterized in that in the battery module, along the vertical direction heap The number of plies of the folded battery cell is 1-5 layers.

5. battery module according to claim 4, which is characterized in that in the battery module, along the vertical direction heap The number of plies of the folded battery cell is 2 layers or 3 layers.

6. battery module according to claim 2, which is characterized in that the battery case further includes third surface, and two The first surface and two second surfaces surround third surface jointly；The area of the first surface is greater than the third The area on surface.

7. battery module according to claim 6, which is characterized in that the battery cell further include first electrode terminal and Second electrode terminal, the first electrode terminal and the second electrode terminal are all set in the third surface.

8. according to the described in any item battery modules of claim 2,6,7, which is characterized in that further include:

Band, surrounds the periphery of the multiple battery cell, and the band includes two long sides and two short sides, the long side with The first surface faces each other and extends along the horizontal direction, and the short side and the second surface face each other and along institute State vertical direction extension.

9. battery module according to claim 8, which is characterized in that including at least two bands, between the band Every distribution.

10. battery module according to claim 8, which is characterized in that the band has first end and the second end, The first end and the second end are laminated along the vertical direction to form joint portion, the joint portion and described first Surface faces each other；Alternatively,

The band has first end and the second end, and the first end and the second end are along the horizontal direction layer It folds to form joint portion, the joint portion is faced each other with the second surface.

11. battery module according to claim 10, which is characterized in that the joint portion of at least two bands is in It is arranged in a straight line.

12. battery module according to claim 8, which is characterized in that further include:

Two end plates are respectively arranged at the both ends along the horizontal direction of the multiple battery cell；The band surrounds institute State the periphery of multiple battery cells and described two end plates.

13. battery module according to claim 12, which is characterized in that the table far from the battery cell of the end plate Face is provided with band limiting slot, and the band limiting slot extends along the vertical direction, and the short side of the band is contained in In the band limiting slot；Alternatively,

The end plate is internally provided with band limit hole, and the band limit hole extends along the vertical direction, the band The short side passes through the band limit hole.

14. battery module according to claim 1, which is characterized in that the size of the battery module in the horizontal direction with The ratio of the size of the battery module along the vertical direction is greater than or equal to 4.

15. a kind of battery pack characterized by comprising

Cabinet has accommodating cavity；And

The multiple such as described in any item battery modules of claim 1~14, multiple battery modules are located in the accommodating cavity.

16. a kind of vehicle characterized by comprising

Vehicle body；And

Battery pack, the battery pack are set to the vehicle body, and the battery pack is battery pack described in claim 15.