CN216958239U - Battery pack and electric automobile - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack and an electric automobile. The application provides a battery pack, including casing and the built-in electric core in the casing, the side wall of casing includes at least one outside convex arch, and positive plate and negative pole piece include main part and journal stirrup respectively, the journal stirrup stretches into in the arch of side leg wall, because the shape of battery pack has fully taken the space on the electric motor car chassis, make full use of the space on the chassis, the cross-sectional area of electric core has been increased simultaneously, the capacity of battery pack has been increased, and then the continuation of the journey mileage is promoted. The electric vehicle provided by the present disclosure includes the battery pack, and therefore, the electric vehicle also has the technical effects described above.

Description

Battery pack and electric automobile

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack and an electric automobile.

Background

The electric automobile can effectively alleviate the problems of energy and environment, wherein the key of the electric automobile is a battery.

In most of the existing batteries of the electric automobile, a plurality of rectangular battery packs are laid on a chassis of the automobile, and the batteries are used for providing power for the electric automobile.

However, it is still necessary to increase the battery capacity of the electric vehicle to improve the driving range.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack and an electric vehicle, which can effectively solve the above or other potential technical problems.

The utility model provides a battery pack, which comprises a shell and a battery core arranged in the shell; the shell comprises a top wall, a bottom wall and a side surrounding wall, wherein the side surrounding wall comprises at least one protrusion protruding outwards; the battery cell is arranged in the shell and comprises a positive plate and a negative plate, the positive plate and the negative plate respectively comprise a main body part and a support lug, and the support lug extends into the protrusion of the side wall.

In an alternative embodiment according to the first aspect, the side walls comprise four side walls connected end to end, wherein the projections are provided on both of the oppositely arranged side walls. The side wall is arranged to include four side walls connected end to end according to the shape of the frame of the chassis of the electric vehicle, and the two opposite side walls are provided with protrusions, so that the protrusions are filled in the gap of the chassis of the electric vehicle, and the space is fully utilized.

In an alternative embodiment according to the first aspect, a plurality of protrusions are arranged at intervals on each of the two oppositely arranged side walls. It should be noted that, in this embodiment, a plurality of protrusions are disposed on two opposite side walls at intervals, so that the idle gap on the side of the chassis can be fully utilized, and meanwhile, the cross-sectional area of the battery pack can be enlarged as much as possible, so as to further enlarge the capacity of the battery pack, and further increase the endurance mileage of the electric vehicle.

In an alternative embodiment according to the first aspect, the cross-section of the protrusion is rectangular, oval, circular or diamond-shaped, and the cross-section of the lug corresponds in shape to the cross-section of the protrusion. It should be noted that, in this embodiment, the cross section of the protrusion is rectangular, oval, circular or rhombic, because the above-mentioned shape is simple and convenient to process, the processing efficiency of the housing can be effectively improved, and the shape of the cross section of the support lug corresponds to the shape of the cross section of the protrusion, that is, when the cross section of the protrusion is rectangular, the shape of the cross section of the support lug is correspondingly set to be rectangular. When the cross section of the bulge is in an oval shape, the cross section of the support lug is correspondingly in an oval shape. When the cross section of the bulge is in a diamond shape, the cross section of the support lug is correspondingly in the diamond shape. The convex shape of so setting up being convenient for coincide is convenient for make full use of the inner space of casing, and then enlarges the electric capacity to promote the continuation of the journey mileage.

In an alternative embodiment according to the first aspect, the protrusions provided on the opposite side walls are symmetrically arranged with respect to a first center line of the housing. It should be noted that, the protrusions disposed on the two opposite side walls are symmetrically disposed about the first central line of the housing, so that the housing itself presents a symmetrical structure, and the stability of the structure of the whole battery pack is further ensured.

In an alternative embodiment according to the first aspect, the cells have a length of 1.4m to 2.2 m; and/or the width of the battery cell is 0.9m-1.6 m; and/or the thickness of the battery cell is 3mm-15 mm.

In an alternative embodiment according to the first aspect, the housing is a soft-pack housing of aluminium-plastic film. The housing is a flexible housing made of an aluminum plastic film, and the housing has high barrier property, good cold press formability, puncture resistance, electrolyte stability and good insulation property. Therefore, the shell is made of the aluminum plastic film shell, so that the shell also has extremely high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance stability and good insulation property.

In an alternative embodiment according to the first aspect, the device further comprises a hard shell, and the hard shell is sleeved outside the shell. It should be noted that, the hard shell is sleeved outside the casing, so that the overall strength of the battery pack can be effectively ensured, and the stability of the battery pack can be improved.

In an alternative embodiment according to the first aspect, the hard outer shell is made of a composite material of nylon and glass fibers; or the hard shell is made of an aluminum alloy material.

In an optional embodiment according to the first aspect, the battery further comprises an airbag, the airbag is located in the housing, and the airbag is separated from the battery core. It should be noted that the air bag is arranged and located in the shell, the air bag is separated from the battery core, and when the battery pack is out of thermal control, the air bag can buffer the high air pressure generated by the battery core, so that the battery is prevented from being exploded.

In an alternative embodiment according to the first aspect, one end of the housing is provided with an arc-shaped projection extending in the length direction, and the airbag is disposed within the arc-shaped projection. It should be noted that the arc-shaped projection is specially used for mounting the airbag, so that the space of the airbag is further ensured, and the explosion phenomenon of the battery is avoided.

The second aspect of the utility model also provides an electric automobile which comprises an automobile body and the battery pack, wherein a chassis of the automobile body is provided with a gap matched with the bulge.

The battery pack provided by the embodiment of the disclosure comprises a shell and a battery cell arranged in the shell; the shell comprises a top wall, a bottom wall and a side surrounding wall, wherein the side surrounding wall comprises at least one bulge protruding outwards; the battery cell is arranged in the shell and comprises a positive plate and a negative plate, the positive plate and the negative plate comprise a main body part and a support lug, and the support lug extends into the protrusion of the side wall. The application provides a battery pack, including casing and the built-in electric core in the casing, the side wall of casing includes at least one outside convex arch, and positive plate and negative pole piece include main part and journal stirrup, the journal stirrup stretches into in the arch of side leg wall, because the shape of battery pack has fully taken the space on the electric motor car chassis, make full use of the space on the chassis, the cross-sectional area of electric core has been increased simultaneously, the capacity of battery pack has been increased, and then the continuation of the journey mileage is promoted.

The electric vehicle provided by the disclosure comprises the battery pack, so that the capacity of the battery pack is increased, and the technical effect of improving the endurance mileage is achieved.

Advantages of additional aspects of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and other objects, features and advantages of the embodiments of the present invention will become more readily understood by the following detailed description with reference to the accompanying drawings. Embodiments of the utility model will now be described, by way of example and not limitation, in the accompanying drawings, in which:

fig. 1 is a schematic view of the overall structure of a battery pack in the prior art;

fig. 2 is a schematic overall structure diagram of a battery pack provided in an embodiment of the present disclosure at a first viewing angle;

fig. 3 is an overall structural schematic diagram of a housing provided in an embodiment of the present disclosure in a first viewing angle;

fig. 4 is an overall structural schematic diagram of a housing provided in an embodiment of the present disclosure at a second viewing angle;

fig. 5 is a schematic structural diagram of a positive electrode plate of a battery cell provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a negative electrode plate of a battery cell provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a separator of a battery cell provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a hard case of a battery pack according to an embodiment of the present application.

Reference numerals:

10-rectangular battery pack;

11-a housing;

111-top wall;

112-a bottom wall;

113-side enclosure walls;

114-a bump;

115-arc shaped bumps;

116-a first centerline;

131-positive plate;

132-a negative plate;

133-a body portion;

134-lugs;

135-a membrane;

15-hard shell.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be a mechanical connection; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Fig. 1 is a schematic view of the overall structure of a battery pack in the prior art. Referring to fig. 1, in most of the conventional batteries for electric vehicles, a plurality of rectangular battery packs 10 are laid on a chassis of a vehicle, and the rectangular battery packs 10 are used to provide power for the electric vehicle. However, since the space on the chassis of the vehicle is not a regular rectangular structure, more space is not occupied by the battery pack, and the space is idle. Meanwhile, the endurance mileage of the existing electric vehicle needs to be further improved.

In view of this, according to the battery pack provided by the embodiment of the application, the shape of the battery pack is set to be matched with the shape of the chassis of the electric vehicle, so that the idle space of the chassis is occupied, the space is reasonably utilized, meanwhile, the cross-sectional area of the battery pack is effectively increased, the battery capacity of the battery pack is increased, and further, the cruising mileage of the electric vehicle is increased.

Fig. 2 is a schematic overall structure diagram of a battery pack provided in an embodiment of the present disclosure at a first viewing angle, and fig. 4 is a schematic overall structure diagram of a housing provided in an embodiment of the present disclosure at a second viewing angle; fig. 5 is a schematic structural diagram of a positive electrode plate of a battery cell provided in an embodiment of the present application; fig. 6 is a schematic structural diagram of a negative electrode sheet of a battery cell provided in an embodiment of the present application. Referring to fig. 2, 4, 5, and 6, in detail, the battery pack according to the embodiment of the disclosure includes a casing 11 and a battery cell embedded in the casing 11; the shell 11 comprises a top wall 111, a bottom wall 112 and a side surrounding wall 113, the side surrounding wall 113 comprises at least one protrusion 114 protruding outwards; the cell is arranged in the casing 11, the cell includes a positive plate 131 and a negative plate 132, the positive plate 131 and the negative plate 132 respectively include a main body portion 133 and a support lug 134, and the support lug 134 extends into the protrusion 114 of the side wall 113. The application provides a battery pack, including casing 11 and the built-in electric core in casing 11, casing 11's side wall 113 includes at least one outside protruding arch 114, and positive plate 131 and negative plate 132 include main part 133 and journal stirrup 134, journal stirrup 134 stretches into in the protruding 114 of side wall 113, battery pack's arch 114 is used for filling the space on the electric automobile chassis, because battery pack's shape has fully taken up the space on the electric automobile chassis, make full use of the space on the chassis, the cross-sectional area of electric core has been increased simultaneously, the capacity of battery pack has been increased, and then the continuation of the journey mileage is promoted.

With reference to fig. 2, fig. 4, fig. 5, and fig. 6, a battery pack provided in an embodiment of the present application includes a casing 11 and a battery cell embedded in the casing 11; the shell 11 comprises a top wall 111, a bottom wall 112 and a side surrounding wall 113, the side surrounding wall 113 comprises at least one protrusion 114 protruding outwards; the cell is arranged in the casing 11, the cell includes a positive plate 131 and a negative plate 132, the positive plate 131 and the negative plate 132 include a main body portion 133 and a support lug 134, and the support lug 134 extends into the protrusion 114 of the side wall 113.

It should be noted that the protrusion 114 of the battery pack is used for filling a gap on the chassis of the electric vehicle, so that the shape of the battery pack fully occupies the gap on the chassis of the electric vehicle, the space on the chassis is fully utilized, meanwhile, the cross-sectional area of the battery core is increased, the capacity of the battery pack is increased, and further, the endurance mileage is improved.

Fig. 3 is an overall structural schematic diagram of a housing provided in the embodiment of the present disclosure in a first viewing angle, and fig. 4 is an overall structural schematic diagram of a housing provided in the embodiment of the present disclosure in a second viewing angle. Referring to fig. 3 and 4, in an alternative exemplary embodiment, the side wall 113 includes four side walls connected end to end, wherein the two opposite side walls are provided with the protrusions 114.

It should be noted that, the side surrounding wall 113 is configured to include four side walls connected end to end according to the shape of the frame of the chassis of the electric vehicle, and the two opposite side walls are both provided with the protrusion 114, so that the protrusion 114 is filled in the gap of the chassis of the electric vehicle, thereby fully utilizing the space.

It is understood that the specific shape of the side wall 113 is not limited herein, and in other embodiments, the side wall 113 may be configured to have other shapes or structures corresponding to the shape of the chassis of the electric vehicle according to the user's requirement.

It should also be understood that, regarding the arrangement of the protrusions 114, in the present application, the protrusions 114 are shown to be arranged on one pair of oppositely arranged side walls of the side surrounding walls 113, it should be noted that, in other specific embodiments, the protrusions 114 may be arranged on four side walls of the side surrounding walls 113, or only one side wall, etc., according to the actual requirements of the user.

Referring to fig. 2 to 6, in an alternative exemplary embodiment, a plurality of protrusions 114 are disposed on each of the two opposite sidewalls at intervals.

It should be noted that, in this embodiment, a plurality of protrusions 114 are disposed on two opposite sidewalls at intervals, so as to fully utilize the idle gap on the side of the chassis, and at the same time, to expand the cross-sectional area of the battery pack as much as possible, to further expand the capacity of the battery pack, and to further increase the endurance mileage of the electric vehicle.

Illustratively, a plurality of protrusions 114 are disposed on the two oppositely disposed sidewalls at equal intervals.

It should be noted that, a plurality of protrusions 114 are disposed on two opposite sidewalls at equal intervals, so as to be well matched with the shape of the chassis of the electric vehicle, and meanwhile, the uniformity of the distribution of the overall structure of the battery can be ensured, thereby ensuring the overall heat dissipation of the battery pack and the stability of the overall structure of the battery pack.

It is understood that the specific arrangement of the protrusions 114 on the side wall is not limited, and in other embodiments, the arrangement can be adaptively adjusted according to the specific shape of the chassis of the electric vehicle.

Illustratively, in this embodiment, the cross-section of the protrusion 114 is rectangular.

In this embodiment, the cross section of the protrusion 114 is rectangular, oval, circular or diamond, and the cross section of the support lug corresponds to the cross section of the protrusion 114.

It should be noted that, in the present embodiment, the cross section of the protrusion 114 is rectangular, oval, circular or rhombic, and since the above shape is simple and convenient to process, the processing efficiency of the housing can be effectively improved.

It should be noted that, the cross section of the support lug is shaped to correspond to the cross section of the protrusion 114, that is, when the cross section of the protrusion 114 is rectangular, the cross section of the support lug is rectangular. When the cross-sectional shape of the protrusion 114 is an ellipse, the cross-sectional shape of the lug is correspondingly set to be an ellipse. When the cross-sectional shape of the protrusion 114 is a diamond shape, the cross-sectional shape of the lug is correspondingly set to be a diamond shape. The convex shape convenient for inosculate is set up like this, the inner space of make full use of casing of being convenient for, and then enlarges electric capacity to promote the continuation of the journey mileage.

In an alternative exemplary embodiment, the protrusions 114 disposed on the opposite sidewalls are symmetrically disposed about a first centerline 116 of the housing 11. It should be noted that the protrusions 114 disposed on the two opposite side walls are symmetrically disposed about the first center line 116 of the housing 11, so that the housing 11 itself presents a symmetrical structure, further ensuring the structural stability of the whole battery pack.

Illustratively, in the present embodiment, the housing 11 is in a rectangular box structure, the protrusion 114 is also provided in a rectangular shape, and the inner cavity of the protrusion 114 is communicated with the inner cavity of the housing 11.

The main bodies 133 and the support lugs 134 of the positive and negative electrode tabs 131 and 132 are also configured to be rectangular, and the shapes of the positive and negative electrode tabs 131 and 132 are adapted to the shape of the casing 11, that is, the shapes of the positive and negative electrode tabs 131 and 132 are reduced in proportion to the shape of the cross section of the casing 11.

Exemplarily, in the embodiment, the length of the cell is 1.4m-2.2 m; and/or the width of the battery cell is 0.9m-1.6 m; and/or the thickness of the battery core is 3mm-15 mm. It is understood that the specific size of the battery cell is not limited to the above range, and in other specific embodiments, the user may adaptively adjust the battery cell according to the actual situation of the chassis of the electric vehicle.

Illustratively, the housing 11 is an aluminum plastic film soft package housing.

It should be noted that, the housing 11 is a soft package housing made of an aluminum plastic film, which can be a flexible housing 11, so that the polygonal battery cell can be better packaged, and the assembly efficiency of the battery pack can be improved. Meanwhile, the aluminum-plastic film has extremely high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance stability and good insulativity. Therefore, by providing the case 11 as the aluminum-plastic film case 11, the case 11 can also have an extremely high barrier property, good cold press formability, puncture resistance, electrolyte stability, and good insulation property.

Fig. 8 is a schematic structural diagram of a hard case of a battery pack provided in an embodiment of the present application. Referring to fig. 8, in an alternative exemplary embodiment, the battery pack further includes a hard casing 15, and the hard casing 15 is sleeved outside the housing 11.

The hard shell 15 is sleeved outside the shell, so that the overall strength of the battery pack can be effectively ensured, and the stability of the battery pack can be improved.

Illustratively, the hard shell 15 is made of a composite material of nylon and fiberglass.

Illustratively, the hard shell 15 may also be made of an aluminum alloy material.

It should be noted that, the specific material of the hard casing 15 is not limited, and in other specific embodiments, the material of the hard casing 15 may be adaptively adjusted according to the specific needs of the user.

In an optional exemplary embodiment, the battery pack further comprises an air bag, the air bag and the battery core are separately arranged, it is to be noted that the air bag is arranged, the air bag is located in the shell and separately arranged from the battery core, and when the battery pack is out of thermal runaway, the air bag can buffer high air pressure generated by the battery core, so that the battery is prevented from exploding.

Illustratively, one end of the housing 11 is provided with an arc-shaped projection 115 extending in the length direction, and the airbag is disposed inside the arc-shaped projection 115. It should be noted that the arc-shaped protrusion 115 is specially used for mounting the airbag, so as to further ensure the space of the airbag and avoid the explosion of the battery. It is understood that, in this embodiment, specific positions and structural arrangements of the airbag are not limited, and in other specific embodiments, positions where no battery cell is disposed in the housing 11 may be set as the airbag according to the needs of the user.

Illustratively, the shape of the positive and negative electrode tabs 131 and 132 is adapted to the shape of the housing, and there is no corresponding arrangement of the positive and negative electrode tabs 131 and 132 at the arc-shaped protrusion 115. Specific shapes of the positive electrode tab 131 and the negative electrode tab 132 are shown in fig. 6 and 7.

The present disclosure also provides an electric vehicle, which includes a vehicle body and the battery pack, wherein a chassis of the vehicle body has a gap matching with the protrusion 114. During installation, the battery pack is mounted on the chassis of the vehicle body with the protrusions 114 of the battery pack filling the voids in the sides of the chassis. The electric automobile that this application provided also possesses the space that can occupy the chassis effectively owing to include foretell battery package, further promotes the technological effect of continuation of the journey mileage.

To better understand the structure of the battery pack provided in the present application, the manufacturing process of the battery pack will be described in general terms as follows:

preparing a positive plate 131 and a negative plate 132 with a support lug 134;

superposing the positive plate 131, the diaphragm 135, the negative plate 132 and the diaphragm 135 together to form a battery core;

the cell is placed in the casing 11 with the protrusion 114 on the side wall 113, and the support lugs 134 of the positive plate 131 and the negative plate 132 extend into the protrusion 114 on the side wall 113 of the casing 11.

In order to make the structural principle of the improved battery pack more clear, the manufacturing process of the battery pack will be described as follows:

the plurality of positive electrode sheets 131 and negative electrode sheets 132 are press-formed such that each of the positive electrode sheets 131 and negative electrode sheets 132 includes a body portion 133 and a tab 134.

Fig. 5 is a schematic structural diagram of a positive electrode plate of a battery cell provided in an embodiment of the present application, fig. 6 is a schematic structural diagram of a negative electrode plate of a battery cell provided in an embodiment of the present application, and fig. 7 is a schematic structural diagram of a separator of a battery cell provided in an embodiment of the present application. Referring to fig. 5, 6, and 7, the positive electrode sheet 131, the diaphragm 135, the negative electrode sheet 132, and the diaphragm 135 are stacked together and compressed into a bare cell, and the bare cell is placed in a vacuum environment to be baked at a high temperature to form a molded cell, where the baking temperature may be set to 95 ℃ and the baking time may be set to 24 hours; packaging the outer side of the formed battery cell by adopting an aluminum-plastic film shell 11, and reserving an unsealed area at one end of the shell; manufacturing electrolyte, and injecting the manufactured electrolyte into the shell 11 through the unsealed area to obtain a semi-finished battery pack; and then, carrying out formation and aging on the semi-finished product battery pack, and carrying out twice packaging on the unsealed area to obtain the formed battery pack.

The positive electrode sheet 131 includes an aluminum foil and a positive electrode active material coated on the aluminum foil, and the negative electrode sheet 132 includes a copper foil and a negative electrode active material coated on the copper foil; the positive electrode sheet 131, the separator 135 and the negative electrode sheet 132 are stacked together and pressed into a bare cell.

Illustratively, the positive electrode sheet 131 is provided with a positive electrode active material on one side or both sides, and the negative electrode sheet 132 is overlaid on the side of the positive electrode sheet 131 provided with the positive electrode slurry; a separator 135 is disposed between the positive electrode tab 131 and the negative electrode tab 132, wherein the shape of the negative electrode tab 132 is the same as that of the positive electrode tab 131, and the size of the negative electrode tab 132 may be slightly larger than that of the positive electrode tab 131 to ensure that the negative electrode tab 132 can completely cover the positive electrode tab 131.

Illustratively, in this embodiment, the positive electrode active material may be obtained by mixing one or two of lithium iron phosphate LiFePO4, lithium manganate LiMn2O4, ternary LiNixCoyMn1-x-yO2(0.5 ≤ x ≤ 0.9,0.05 ≤ y ≤ 0.3), LiNixCoyAl1-x-yO2(0.7 ≤ x ≤ 0.9,0.05 ≤ y ≤ 0.2), ternary lithium-rich material, and mixing N-methylpyrrolidone with a certain amount of conductive agent and binder.

In this embodiment, the negative active material may be high-capacity long-cycle dynamic graphite or graphite, and may be obtained by uniformly mixing the mixture with a conductive agent, a dispersant, and a binder in an aqueous solvent. Or mixing the power graphite or the graphite with one or two of a certain amount of silicon-oxygen negative electrode and silicon-carbon negative electrode to form a mixture, and then mixing the mixture with water, a conductive agent, a dispersing agent and a binder. Wherein, the mass content of one or two of the silicon carbon negative electrode and the silicon oxygen negative electrode is 1-30%, and further, the mass ratio of the silicon carbon to the silicon oxygen is 0.01-0.5: 1.

for example, in the present embodiment, the diaphragm 135 may be a polypropylene PP, a polyethylene PE, or a composite material diaphragm 135, which is one of surface-coated with ceramic and glue.

For example, in this embodiment, the electrolyte may be lithium hexafluorophosphate electrolyte containing 1Mol, the solvent is ethylene carbonate, and the ethylene carbonate is a mixed solvent prepared by mixing dimethyl carbonate and 1,2 propylene carbonate according to a volume ratio of 1:1: 1.

Illustratively, the unsealed area is packaged twice, and the end socket adopted by the second packaging mode is provided with vent point (exhaust port), so that the internal gas is directionally sprayed out before the thermal runaway of the battery, and the directional spraying function can be realized according to the conventional ratio.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.

Claims (12)

1. The battery pack is characterized by comprising a shell and a battery cell arranged in the shell;

the shell comprises a top wall, a bottom wall and a side surrounding wall, wherein the side surrounding wall comprises at least one protrusion protruding outwards;

the battery cell is arranged in the shell and comprises a positive plate and a negative plate, the positive plate and the negative plate respectively comprise a main body part and a support lug, and the support lug extends into the bulge of the side surrounding wall.

2. The battery pack of claim 1, wherein the side walls comprise four side walls connected end to end, and wherein the protrusions are disposed on two opposite side walls.

3. The battery pack of claim 2, wherein the protrusions are spaced apart from each other on opposite sidewalls.

4. The battery pack of claim 2, wherein the cross-section of the protrusion is rectangular, oval, circular, or diamond-shaped, and the cross-section of the lug corresponds in shape to the cross-section of the protrusion.

5. The battery pack according to claim 4, wherein the protrusions provided on the opposite side walls are symmetrically provided about the first center line of the case.

6. The battery pack of claim 5, wherein the cells have a length of 1.4m to 2.2 m; and/or the presence of a gas in the atmosphere,

the width of the battery cell is 0.9m-1.6 m; and/or the presence of a gas in the gas,

the thickness of the battery core is 3mm-15 mm.

7. The battery pack of any of claims 1-6, wherein the housing is an aluminum plastic film pouch housing.

8. The battery pack according to any one of claims 1 to 6, further comprising a hard outer case that is provided on the outside of the case.

9. The battery pack of claim 8, wherein the rigid outer shell is made of a composite material of nylon and fiberglass; or the like, or, alternatively,

the hard shell is made of an aluminum alloy material.

10. The battery pack of any one of claims 1-6, further comprising a bladder located within the housing, the bladder being disposed separately from the electrical core.

11. The battery pack according to claim 10, wherein one end of the case is provided with an arc-shaped protrusion extending in a length direction, and the airbag is disposed in the arc-shaped protrusion.

12. An electric vehicle comprising a vehicle body and the battery pack of any one of claims 1 to 11, wherein a chassis of the vehicle body has a clearance that fits in the protrusion.

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