CN215988953U - Insulation board, pole piece group, battery monomer, battery and power consumption device - Google Patents

Abstract

The application relates to an insulation board, a pole piece group, a battery monomer, a battery and an electric device. The insulating plate is arranged in the shell of the battery monomer and is used for padding an electrode plate group; this insulation board has supporting part and at least one fretwork hole, and the supporting part encloses around self thickness direction and closes and form the fretwork hole, and each fretwork hole all link up the setting along thickness direction. The bottom of this utmost point piece group has straight face and at least one convex part, and each convex part is all along deviating from the direction protruding of the top of utmost point piece group and is located on straight face. The battery cell comprises a shell, the insulating plate and the pole piece group, wherein the insulating plate and the pole piece group are arranged in the shell. Above-mentioned insulation board, utmost point piece group and battery monomer not only can avoid utmost point piece group and R angle to take place to interfere and damage utmost point piece group, moreover because the existence of fretwork hole on the insulation board, the volume that allows utmost point piece group has increased the volume of convex part for the volume of utmost point piece group increases in the casing, so improved casing inner space utilization and battery monomer energy density.

Description

Insulation board, pole piece group, battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to an insulating plate, a pole piece group, a battery monomer, a battery and an electric device.

Background

At present, the battery cell is mainly formed by stamping the shell, and an arc-shaped R corner is usually formed at the bottom corner during forming. To avoid the pole piece damage caused by the interference between the pole piece in the casing and the R-angle, an insulation plate is usually placed at the bottom of the pole piece to cushion the pole piece, so that the height of the pole piece is not lower than the height of the R-angle. In this way, the insulating plate occupies the space in the shell, so that the utilization rate of the space in the shell is reduced, and the energy density of the whole battery monomer is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides an insulating plate, a pole piece group, a battery cell, a battery, and an electric device, which can solve the problems of a decrease in the space utilization rate in a battery cell housing and a decrease in the energy density of the battery cell due to the insulating plate.

In a first aspect, the present application provides an insulating plate, placed inside a casing of a battery cell, for padding a plate group; the insulation board has supporting part and at least one fretwork hole, and the supporting part encloses around self thickness direction and closes and form the fretwork hole, and each fretwork hole all link up the setting along thickness direction.

In the technical scheme of this application embodiment, when in actual use, the bottom surface at battery monomer casing inside is placed to the insulation board, and pole piece group supports on the supporting part of insulation board, because supporting part self has certain thickness, it can ask high pole piece group to take place to interfere and damage in order to avoid pole piece group and the R angle region in the casing when the design. Meanwhile, due to the existence of the hollow holes in the insulating plate, the convex parts accommodated in the hollow holes are additionally arranged at the bottom of the pole piece group, so that the size of the pole piece group in the shell is increased, the utilization rate of the internal space of the shell and the energy density of the battery monomer are improved, and particularly, the contribution of the increased convex parts to the energy density of the battery monomer corresponding to the pole piece group with a short size is larger.

In some embodiments, the width of the support portion is 3mm to 5mm in both a first direction and a second direction perpendicular to the thickness direction, the first direction being perpendicular to the second direction. At this moment, the supporting part of the insulating plate not only can meet the supporting requirement, but also the space of the hollow hole is large, so that the volume of the electrode plate group is increased greatly, and the space utilization rate inside the shell and the energy density of the battery monomer can be improved more remarkably.

In some embodiments, the support portion has a thickness of 0.3mm to 0.8 mm. At this time, the use requirements of most of the battery cells can be met.

In some embodiments, the support portion is a solid portion. In this case, the number of working steps of the insulating plate is reduced, and the manufacturing cost can be reduced.

In some embodiments, a material reducing hole is provided on the support portion. At this time, the material reducing hole is used to reduce the material consumption, and the manufacturing cost can be reduced.

In some embodiments, a projection of the circumferential outer wall of the support portion on a cross section perpendicular to the thickness direction is a first projection, a projection of the circumferential inner wall of the support portion for forming the hollow hole on the cross section is a second projection, and the first projection and the second projection are arranged in a self-symmetry manner relative to the same symmetry plane. At the moment, the insulating plate is self-symmetrical relative to the symmetrical surface, so that the processing and manufacturing of the insulating plate are facilitated, the self-symmetrical structure of the pole piece group is facilitated, and the preparation of the pole piece group is simplified.

In some embodiments, the first projection and the second projection are both square. At the moment, the insulating plate and the hollow holes are square, the square battery is suitable for manufacturing square battery monomers, and the insulating plate has a good supporting effect on the electrode plate set.

In a second aspect, the present application provides a pole piece assembly, the bottom of pole piece assembly has flat and straight face and at least one convex part, and each convex part is all along deviating from the direction protruding on the top of pole piece assembly and locate flat and straight face.

In the technical scheme of this application embodiment, the straight face of pole piece group supports on the supporting part of the insulation board in above-mentioned embodiment, and the convex part of pole piece group is located the fretwork of the insulation board in above-mentioned embodiment downthehole, compares that the bottom of pole piece group only is provided with straight face, utilizes the convex part to increase the pole piece group at the inside shared space of casing, has improved the holistic volume of pole piece group, helps increasing battery monomer energy density.

The third aspect, the application provides a battery monomer, including the casing, and all locate inside the casing like above-mentioned utmost point piece group and like above-mentioned insulation board, the inside bottom surface of casing is located to the insulation board, and straight face supports in the supporting part, and each convex part holds in a fretwork hole.

In the technical scheme of this application embodiment, the bottom surface at battery monomer casing inside is placed to the insulation board, and pole piece group supports on the supporting part of insulation board, because supporting part self has certain thickness, it can ask high pole piece group to take place to interfere and damage in order to avoid pole piece group and the R angle region in the casing when the design. Meanwhile, due to the existence of the hollow holes in the insulating plate, the volume of the pole piece group is allowed to increase the volume of the convex part, so that the volume of the pole piece group in the shell is increased, the utilization rate of the internal space of the shell and the energy density of the battery monomer are improved, and particularly, the increased convex part corresponding to the pole piece group with a short size contributes to the energy density of the battery monomer greatly.

In some embodiments, the distance between the circumferential outer wall of the support portion and the side surface of the interior of the housing ranges from 0.5mm to 3 mm. At the moment, a gap is formed between the supporting part and the side face inside the shell, so that the interference between the supporting part and the R angle inside the shell can be avoided, and meanwhile, the assembly of the insulating plate, the pole piece group and the shell is facilitated.

In a fourth aspect, the present application provides a battery, including the above battery cell and a case, where the case accommodates the battery cell. In the technical scheme of this application embodiment, the insulating board among the battery monomer is placed in the inside bottom surface of battery monomer casing, and pole piece group supports on the supporting part of insulating board, because supporting part self has certain thickness, it can ask high pole piece group to take place to interfere and damage in order to avoid pole piece group and the R angle region in the casing when the design. Meanwhile, due to the existence of the hollow holes in the insulating plate, the volume of the pole piece group is allowed to increase the volume of the convex part, so that the volume of the pole piece group in the shell is increased, the utilization rate of the internal space of the shell and the energy density of the battery monomer are improved, and particularly, the increased convex part corresponding to the pole piece group with a short size contributes to the energy density of the battery monomer greatly.

In a fifth aspect, the present application provides an electric device comprising the above battery for providing electric energy. In the technical scheme of this application embodiment, the bottom surface at battery monomer casing inside is placed to the insulation board, and pole piece group supports on the supporting part of insulation board, because supporting part self has certain thickness, it can ask high pole piece group to take place to interfere and damage in order to avoid pole piece group and the R angle region in the casing when the design. Meanwhile, due to the existence of the hollow holes in the insulating plate, the volume of the pole piece group is allowed to increase the volume of the convex part, so that the volume of the pole piece group in the shell is increased, the utilization rate of the internal space of the shell and the energy density of the battery monomer are improved, and particularly, the increased convex part corresponding to the pole piece group with a short size contributes to the energy density of the battery monomer greatly.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

FIG. 1 is a top view of an insulating plate according to some embodiments of the present application;

FIG. 2 is a cross-sectional view of the insulating plate shown in FIG. 1;

fig. 3 is a schematic diagram of a cell structure according to some embodiments of the present disclosure;

fig. 4 is a schematic view of a partial structure of a battery cell according to some embodiments of the present disclosure;

FIG. 5 is a schematic view of the combination of a pole piece assembly and an insulating plate according to some embodiments of the present disclosure;

FIG. 6 is an exploded view of a battery according to some embodiments of the present application;

FIG. 7 is a schematic illustration of a vehicle according to some embodiments of the present application.

Description of reference numerals:

a vehicle 1000;

a battery 100; a battery cell 10; an insulating plate 110; a support portion 111; a hollowed-out hole 112; a pole piece set 120;

a flat surface 121; the convex portion 122; a housing 130; an end cap 140; a pole 150; a case 20;

a controller 200;

a motor 300;

a thickness direction X; a first direction Y; a second direction Z.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Lithium battery cells are increasingly widely used as power sources in electronic products, communication equipment, automatic instruments and meters and various electric tools, and have the advantages of light weight, good safety performance and high energy sealing performance which are not possessed by other energy storage battery cells. Lithium battery cells are generally divided into coiled lithium battery cells and laminated lithium battery cells, which are widely used due to their higher quality. In the single preparation process of current lamination formula lithium cell, need with the pole piece group assembly in a punching press or tensile casing that forms, there is an R angle bottom of casing all the time, that is to say, there is a cambered surface between inside bottom surface of casing and the side, and the pole piece group does not have the R angle, therefore the corner of pole piece group can produce with the R angle of casing and interfere, to avoid the R angle of casing and pole piece group structure to produce to interfere and damage the pole piece group, need make the pole piece group dodge to the R angle region of casing.

The present inventors have noted that, in the related art, in order to make the pole piece group avoid the R-angle region of the casing, an insulating plate is usually placed at the bottom of the casing, and the insulating plate is used to raise the whole pole piece group so as to make the pole piece group avoid the R-angle region. At the moment, the insulating plate occupies the inner space of the shell, so that the space for accommodating the electrode plate group in the shell is reduced, and the utilization rate of the inner space of the shell and the energy density of the single battery are reduced.

In order to solve the problems that the utilization rate of the internal space of the single battery shell is reduced and the energy density of the single battery is reduced due to the insulating plate, the applicant researches and discovers that the space occupied by the insulating plate can be reduced by arranging the hole for accommodating the electrode plate group on the insulating plate, the accommodating space of the electrode plate group is increased, the volume of the electrode plate group in the shell can be increased, and the energy density of the single battery is further increased.

Based on the above consideration, in order to solve the problems of the reduction of the internal space utilization rate of the battery cell case and the reduction of the energy density of the battery cell due to the insulating plate, the inventors have conducted intensive studies to design an insulating plate. The insulating plate not only supports and supports the pole piece group to avoid the interference of the pole piece group and the R angle region, but also utilizes the through hollow holes to increase the accommodating space of the pole piece group, so that the volume of the pole piece group in the shell is improved compared with the volume of the existing pole piece group, and the energy density of a battery monomer and the space utilization rate of the shell are improved.

According to some embodiments of the present application, referring to fig. 1 and 2, fig. 1 is a top view of an insulating plate 110 according to some embodiments of the present application, and fig. 2 is a cross-sectional view of the insulating plate 110 shown in fig. 1, the present application provides an insulating plate 110 placed inside a case of a battery cell for padding a stack of electrode plates; the insulating plate 110 has a supporting portion 111 and at least one hollow hole 112, the supporting portion 111 surrounds the thickness direction X to form the hollow hole 112, and each hollow hole 112 is through-arranged along the thickness direction X.

The insulating plate 110 is described above, referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of the battery cell 10 in some embodiments of the present application, and fig. 4 is a schematic partial structural diagram of the battery cell 10 in some embodiments of the present application, in practical use, the insulating plate 110 is placed on a bottom surface inside the housing 130 in the battery cell 10, the pole piece group 120 is supported on the supporting portion 111 of the insulating plate 110, and since the supporting portion 111 itself has a certain thickness, it can support the pole piece group 120 to avoid the pole piece group 120 from interfering with the R-corner region in the housing 130 and being damaged in design. Meanwhile, due to the existence of the hollow hole 112 on the insulating plate 110, the protrusion 122 accommodated in the hollow hole 112 is added at the bottom of the pole piece group 120, so that the volume of the pole piece group 120 in the casing 130 is increased, thereby improving the internal space utilization rate of the casing 130 and the energy density of the battery cell 10, and particularly, the protrusion 122 added corresponding to the pole piece group 120 with a short size greatly contributes to the energy density of the battery cell 10.

In actual use, the pole piece group 120 is supported by one end of the support portion 111 in the thickness direction X, and the other end of the support portion 111 in the thickness direction X is supported by the bottom surface inside the housing 130. Preferably, the number of the protrusions 122 of the pole piece group 120 is equal to the number of the through holes 112, and the protrusions 122 correspond to the through holes 112 one by one, that is, one protrusion 122 is accommodated in one through hole 112, and at this time, the space utilization rate is high, which is beneficial to improving the energy density of the battery cell 10.

Preferably, the number of the hollow holes 112 is one, and the volume of the hollow hole 112 obtained at this time is large, so that the space occupied by the supporting portion 111 between the hollow hole 112 and the hollow hole 112 can be reduced, and further, the volume of all the convex portions 122 in the pole piece group 120 accommodated in the hollow hole 112 can be increased, the space utilization rate in the casing 130 is maximized, and the energy density of the battery cell 10 is greatly increased.

Optionally, the insulating plate 110 is a plastic piece. The insulating plate 110 is made of plastic, and has good insulating property and low price.

In some embodiments of the present application, the width of the supporting portion 111 is 3mm to 5mm in both a first direction Y and a second direction Z perpendicular to the thickness direction X, and the first direction Y and the second direction Z are perpendicular to each other. In this case, the supporting portion 111 of the insulating plate 110 not only can satisfy the supporting requirement, but also the space of the hollow hole 112 is large, so that the volume of the electrode plate group 120 is increased greatly, and the space utilization rate inside the housing 130 and the energy density of the battery cell 10 can be further significantly improved.

The width of the support portion 111 in a certain direction is a distance between any one of at least two outer intersections where any one direction parallel to the direction intersects with the circumferential inner wall of the support portion 111 and at least two inner intersections where the direction intersects with the circumferential outer wall of the support portion 111 and the closest intersection (inner intersection or outer intersection). The distance between each inner intersection and the nearest intersection may be equal or different, and may be in the range of 3mm to 5 mm. Wherein, the '3 mm-5 mm' includes the end point value. Alternatively, the width of the supporting portion 111 may be 3.5mm, 4mm, 4.5mm, or the like.

For example, when the hollowed-out hole 112 includes one, the number of the outer intersection points and the inner intersection points located in a certain direction is two, and one of the inner intersection points is close to one of the outer intersection points, and the other of the inner intersection points is close to the other of the outer intersection points. For example, when two of the hollow holes 112 are included, and the two hollow holes 112 are sequentially disposed along a certain direction, the number of the outer intersection points located in the direction is two, and the number of the inner intersection points is four, two of the inner intersection points are respectively close to the two outer intersection points, and the other two inner intersection points are close to each other.

Wherein the first direction Y and the second direction Z are determined according to the shape of the insulating plate 110. For example, when the insulating plate 110 is a square ring-shaped plate, the first direction Y corresponds to the longitudinal direction of the insulating plate 110, and the second direction Z corresponds to the width direction of the insulating plate 110, it is required that the width of the support 111 in the longitudinal direction of the insulating plate 110 and the width in the width direction of the insulating plate 110 are both within a range of 3mm to 5 mm. For example, when the insulating plate 110 is a circular annular plate, the first direction Y corresponds to two radial directions of the insulating plate 110 perpendicular to each other, and the annular width of the insulating plate 110 is required to be within 3mm to 5 mm.

In some embodiments of the present application, the thickness of the support 111 is 0.3mm to 0.8 mm. Because the radius specification of the R corner of the housing 130 of the battery cell 10 generally has 0.2mm and 0.5mm, the thickness of the support portion 111 is set within 0.3mm to 0.8mm, which can meet the use requirement of most battery cells 10. Optionally, the thickness of the support 111 is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8 mm.

In practical applications, the thickness of the supporting portion 111 may be slightly higher than the radius of the R-angle. For example, if the radius of the R-angle is 0.2mm, the thickness of the support portion 111 is 0.3mm, which can improve the safety of the pole piece set 120.

Of course, in other embodiments, the thickness of the supporting portion 111 may be selected to have other dimensions, depending on the specific value of the R-angle. For example, when the radius of the R-angle is 1.5mm, the thickness of the support 111 may exceed 1.5mm, for example, 1.6 mm.

In some embodiments of the present application, the supporting portion 111 is a solid portion. In this case, the number of processes for manufacturing the insulating plate 110 is reduced, and the manufacturing cost can be reduced.

In some embodiments of the present application, a material reducing hole (not shown) is disposed on the supporting portion 111. At this time, the material reducing hole is used to reduce the material consumption, and the manufacturing cost can be reduced. The material reducing holes are not particularly limited in arrangement. For example, the material reducing holes are provided on the circumferential inner wall of the support portion 111, and/or the material reducing holes are provided on the end face of the support portion 111 for supporting the pole piece group 120, and/or the material reducing holes are provided on the end face of the support portion 111 for supporting the housing 130. The number, shape and size of the material reducing holes are not limited, and the hole opening form can be a through hole or a blind hole.

In some embodiments of the present application, a projection of the circumferential outer wall of the supporting portion 111 on a cross section perpendicular to the thickness direction X is a first projection, a projection of the circumferential inner wall of the supporting portion 111 for forming the hollow hole 112 on the cross section is a second projection, and the first projection and the second projection are self-symmetrically arranged with respect to the same symmetry plane. At this time, the insulating plate 110 is self-symmetrical with respect to the symmetrical surface, which not only facilitates processing and manufacturing the insulating plate 110, but also facilitates the formation of a self-symmetrical structure for the plate assembly 120, thereby simplifying the preparation of the plate assembly 120.

In particular, in an embodiment, the first projection and the second projection are both square. At this time, the insulating plate 110 and the hollow-out hole 112 are both square, which is suitable for the preparation of a square battery cell, and the insulating plate 110 has a good supporting effect on the electrode plate group 120. The packaging reliability of the square battery monomer is high; the system has high energy efficiency; relatively light weight and high energy density; the structure is simpler, and the dilatation is convenient relatively, is the current important option that improves energy density through improving monomer capacity. Of course, in other embodiments, the square battery cell may be prepared by only the second projection being square and the first projection being circular or other shapes, and is not limited in particular.

The square shape comprises a rectangle and a square, and the four corners of the square shape can be connected by a right angle or can be connected by a chamfer or a fillet.

In the insulating plate 110 provided in the embodiment of the present application, due to the existence of the hollow hole 112 on the insulating plate 110, the convex portion 122 accommodated in the hollow hole 112 may be added to the bottom of the pole piece group 120, so that the volume of the pole piece group 120 in the housing 130 is increased, thereby improving the internal space utilization rate of the housing 130 and the energy density of the battery cell 10, and especially, the contribution of the increased convex portion 122 to the energy density of the battery cell 10 corresponding to the pole piece group 120 with a short size is large.

According to some embodiments of the present application, referring to fig. 4, the present application further provides a pole piece group 120, the bottom end of the pole piece group 120 has a flat surface 121 and at least one convex portion 122, and each convex portion 122 is protruded on the flat surface 121 in a direction away from the top end of the pole piece group 120.

In the above-mentioned pole piece group 120, during actual operation, the flat surface 121 of the pole piece group 120 is supported on the supporting portion 111 of the insulating plate 110 in the above-mentioned embodiment, and the convex portion 122 of the pole piece group 120 is located in the hollow hole 112 of the insulating plate 110 in the above-mentioned embodiment, compared with the case that only the flat surface 121 is provided at the bottom end of the pole piece group 120, the convex portion 122 increases the space occupied by the pole piece group 120 inside the casing 130, improves the overall volume of the pole piece group 120, and is helpful for increasing the energy density of the battery cell 10.

By further referring to fig. 3 and 4, the plate group 120 is preferably a laminated plate group 120, and includes a plate group 120, a cathode plate group 120 and a separator, where the plate group 120 includes a plurality of anode plates arranged in parallel at intervals, the cathode plate group 120 includes a plurality of cathode plates arranged in parallel at intervals, the plurality of anode plates and the plurality of cathode plates are alternately stacked, and adjacent anode plates and cathode plates are separated by the separator, and the separator is wrapped at the bottom end of the plate group 120. Wherein the separator is used as an insulating treatment. Of course, in other embodiments, the pole piece group 120 may be a winding pole piece group 120, and the specific structure of the winding pole piece group 120 is not described in detail in this embodiment.

In order to form the flat surface 121 and the convex portion 122 at the bottom end of the pole piece group 120, when the pole piece group 120 is prepared, a shorter pole piece is selected to form the flat surface 121, and a higher pole piece is selected to form the convex portion 122, and the pole piece group 120 with the bottom end in the shape of the inverted convex is obtained by binding and shaping the positive pole piece group 120, the negative pole piece group 120 and the diaphragm.

In some embodiments of the present application, with further reference to fig. 3, the top end of the pole piece set 120 is disposed flush. When the pole piece group 120 is prepared, one end of each pole piece with different heights can be aligned and stacked to form the pole piece group 120, and the pole piece group 120 with the convex part 122 and the flat surface 121 at the bottom end is obtained naturally, so that the pole piece group 120 is convenient to manufacture.

According to some embodiments of the present application, referring to fig. 3 and 4, the present application further provides a battery cell 10, including a case 130, a pole piece assembly 120 provided in the above embodiment and an insulating plate 110 provided in the above embodiment, which are disposed inside the case 130, wherein the insulating plate 110 is disposed on a bottom surface inside the case 130, a flat surface 121 of the pole piece assembly 120 is supported by the supporting portion 111, and each protruding portion 122 is received in one of the hollow holes 112.

In the single battery 10, the insulating plate 110 is placed on the bottom surface inside the housing 130 of the single battery 10, and the pole piece group 120 is supported on the supporting portion 111 of the insulating plate 110, and since the supporting portion 111 has a certain thickness, the supporting portion can support the pole piece group 120 to prevent the pole piece group 120 from interfering with the R-corner region inside the housing 130 and being damaged. Meanwhile, due to the existence of the hollow-out hole 112 on the insulating plate 110, the volume of the pole piece group 120 is allowed to increase by the volume of the protrusion 122, so that the volume of the pole piece group 120 in the casing 130 is increased, the utilization rate of the internal space of the casing 130 and the energy density of the battery cell 10 are improved, and particularly, the increased protrusion 122 corresponding to the pole piece group 120 with a short size greatly contributes to the energy density of the battery cell 10.

Since the battery cell 10 includes the insulating plate 110 and the pole piece group 120 in the above embodiment, it includes all the advantages in the above embodiment, and the description thereof is omitted.

The phrase "each protrusion 122 is accommodated in one hollow hole 112" includes, but is not limited to, that each protrusion 122 is accommodated in one hollow hole 112 in a one-to-one correspondence manner, and may also include that two protrusions 122 are accommodated in one hollow hole 112. Preferably, one convex portion 122 is correspondingly accommodated in one hollow-out hole 112, and the space utilization rate of the hollow-out hole 112 is relatively large.

In some embodiments of the present disclosure, the number of the holes 112 in the insulating plate 110 is one, and the number of the protrusions 122 in the pole piece group 120 is one. In this way, the volume of the protrusion 122 and the hollow hole 112 can be maximized, thereby maximizing the space utilization and the energy density of the battery cell 10.

In some embodiments of the present disclosure, a distance between the circumferential outer wall of the supporting portion 111 and the side surface inside the housing 130 ranges from 0.5mm to 3 mm. Specifically, the distance between the circumferential outer wall of the supporting portion 111 and the side surface inside the housing 130 may be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or the like. At this time, a gap is formed between the supporting portion 111 and the side surface inside the housing 130, so that interference between the supporting portion 111 and the R corner inside the housing 130 can be avoided, and assembly of the insulating plate 110, the pole piece assembly 120 and the housing 130 is facilitated.

In practical applications, the circumferential dimension of the insulating plate 110 varies with the dimension of the inside of the case 130, and the present application does not limit the circumferential dimension of the insulating plate 110 as long as there is a gap of 0.5mm to 3mm between the insulating plate 110 and the side surface of the inside of the case 130.

Understandably, the battery cell 10 further includes an end cap 140, a terminal post 150, and the like. The terminal 150 includes a positive terminal connected to the positive connector and a negative terminal connected to the negative connector. The end cap 140 refers to a member that covers an opening of the case 130 to insulate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 140 may be adapted to the shape of the housing 130 to fit the housing 130. Alternatively, the end cap 140 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 140 is not easily deformed when being extruded and collided, and the single battery 10 may have a higher structural strength and improved safety performance. The end cap 140 may be provided with functional components such as the electrode terminal 21 a. In some embodiments, the end cap 140 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cap 140 may also be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 140, which may be used to isolate the electrical connection components within the housing 130 from the end cap 140 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

Housing 130 is a component for mating with end cap 140 to form the internal environment of battery cell 10, wherein the formed internal environment can be used to house plate stack 120, electrolyte, and other components. The housing 130 and the end cap 140 may be separate components, and an opening may be formed in the housing 130, and the end cap 140 may cover the opening to form the internal environment of the battery cell 10. Without limitation, the end cap 140 and the housing 130 may be integrated, and specifically, the end cap 140 and the housing 130 may form a common connecting surface before other components are inserted into the housing, and when it is required to enclose the inside of the housing 130, the end cap 140 covers the housing 130. The housing 130 may be various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the housing 130 may be determined according to the specific shape and size of the pole piece group 120. The material of the housing 130 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

Preferably, the battery cell 10 is a prismatic battery cell. The packaging reliability of the square battery monomer is high; the system has high energy efficiency; relatively light weight and high energy density; the structure is simpler, and the dilatation is convenient relatively, is the current important option that improves energy density through improving monomer capacity. Of course, the feasibility of applying the solution of the present application to round cells or other types of cells is not excluded.

The pole piece assembly 120 is a component of the battery cell 100 where electrochemical reactions occur. One or more pole piece sets 120 may be contained within housing 130. The electrode sheet group 120 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive plate and the negative plate with the active materials form the main body part of the electric core assembly, and the parts of the positive plate and the negative plate without the active materials form the tabs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected with the electrode terminals to form a current loop. In some embodiments, the pole piece set 120 is preferably a laminated pole piece set 120, and includes a positive pole piece set 120, a negative pole piece set 120 and a diaphragm, the positive pole piece set 120 includes a plurality of positive pole pieces arranged in parallel at intervals, the negative pole piece set 120 includes a plurality of negative pole pieces arranged in parallel at intervals, the plurality of positive pole pieces and the plurality of negative pole pieces are arranged in a cross-stacked manner, adjacent positive pole pieces and adjacent negative pole pieces are separated by the diaphragm, and the bottom end of the pole piece set 120 is covered with the diaphragm. Wherein the separator is used as an insulating treatment. Of course, in other embodiments, the pole piece group 120 may be a winding pole piece group 120, and the specific structure of the winding pole piece group 120 is not described in detail in this embodiment.

In the single battery 10 in some embodiments of the present application, the pole piece group 120 is a laminated pole piece group 120, and an assembly process of the single battery 10 is as follows: stacking, binding and shaping a plurality of positive plates, a plurality of negative plates and diaphragms to form a plate group 120, aligning the top ends of the pole pieces in the stacking process, and forming a flat surface 121 and a convex part 122 by using the height of the bottom end of each pole piece; then, the insulating plate 110 is buckled at the bottom end of the pole piece group 120, and the convex portion 122 of the pole piece group 120 is located in the hollow hole 112 of the insulating plate 110, so as to obtain an assembly (refer to fig. 5, fig. 5 is a schematic diagram of the combination of the pole piece group 120 and the insulating plate 110); finally, the assembly is placed inside the housing 130.

According to some embodiments of the present application, the present application also provides a battery 100, which includes the battery cell 10 provided in any one of the above embodiments, and a case 20, wherein the case 20 accommodates the battery cell 10. Since the battery 100 includes the single battery cell 10 in the above embodiment, it has all the advantages of the above embodiment, and therefore, the description thereof is omitted.

Referring to fig. 6, fig. 6 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is accommodated in the case 20. The case 20 is used to provide a receiving space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 cover each other, and the first portion 21 and the second portion 22 together define a receiving space for receiving the battery cell 10. The second part 22 may be a hollow structure with one open end, the first part 21 may be a plate-shaped structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 define a receiving space together; the first portion 21 and the second portion 22 may be both hollow structures with one side open, and the open side of the first portion 21 may cover the open side of the second portion 22. Of course, the box 20 formed by the first portion 21 and the second portion 22 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 10 may be multiple, and the multiple battery cells 10 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to that the multiple battery cells 10 are connected in series or in parallel. The plurality of single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of single batteries 10 is accommodated in the box body 20; of course, the battery 100 may also be formed by connecting a plurality of battery cells 10 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 20. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 10.

Wherein, each battery cell 10 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 10 may be cylindrical, flat, rectangular parallelepiped, or other shape.

According to some embodiments of the present application, the present application further provides an electric device, including the above battery 100, wherein the battery 100 is used for providing electric energy. Since the electric device includes the battery 100 in the above embodiment, it has all the advantages of the above embodiment, and therefore, the detailed description thereof is omitted.

The powered device may be, but is not limited to, a cell phone, tablet, laptop, electronic toy, electric tool, battery car, electric car, ship, spacecraft, and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. An insulating plate is placed inside a shell of a battery monomer and used for padding a pole piece group; the insulation board is characterized by comprising a supporting portion and at least one hollow hole, the supporting portion surrounds the thickness direction of the supporting portion to form the hollow hole, and each hollow hole is arranged in a penetrating mode along the thickness direction.

2. The insulating plate according to claim 1, wherein the width of the support portion is 3mm to 5mm in both a first direction and a second direction perpendicular to the thickness direction, the first direction being perpendicular to the second direction.

3. The insulating plate according to claim 1, wherein the thickness of the support is 0.3mm to 0.8 mm.

4. The insulating plate according to claim 1, characterized in that said support is a solid portion.

5. The insulating plate according to claim 1, wherein the support portion is provided with a material reducing hole.

6. The insulating plate according to claim 1, wherein a projection of a circumferential outer wall of the supporting portion on a cross section perpendicular to the thickness direction is a first projection, a projection of a circumferential inner wall of the supporting portion for forming the hollow hole on the cross section is a second projection, and the first projection and the second projection are arranged in a self-symmetry manner with respect to a same symmetry plane.

7. The insulating plate according to claim 6, characterized in that said first projection and said second projection are both square.

8. The pole piece group is characterized in that the bottom end of the pole piece group is provided with a flat surface and at least one convex part, and each convex part is convexly arranged on the flat surface along the direction deviating from the top end of the pole piece group.

9. A battery cell, comprising a housing, a plate assembly according to any one of claims 8 and an insulating plate according to any one of claims 1 to 7, wherein the plate assembly is disposed inside the housing, the insulating plate is disposed on a bottom surface inside the housing, the flat surface is supported by the supporting portion, and each of the protrusions is received in one of the holes.

10. The battery cell according to claim 9, wherein a distance between the circumferential outer wall of the support portion and the side surface inside the case has a value in a range of 0.5mm to 3 mm.

11. A battery, comprising:

a battery cell according to claim 9 or 10; and

and the box body is used for accommodating the battery cells.

12. An electrical device comprising a battery as claimed in claim 11 for providing electrical energy.

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