CN217387312U - Battery case and battery - Google Patents

Abstract

The application discloses battery case and battery, battery case includes: the shell comprises a shell body, wherein an accommodating space is defined in the shell body, the shell body is provided with two open ends, each open end is communicated with the accommodating space, and the shell body is provided with a liquid injection hole and a conductive connecting area; a lower cover at one end of the housing body for closing one open end; an upper cover located at the other end of the housing body for closing the other open end; wherein at least one of the lower cover and the upper cover is snap-fit connected with the housing body when closing the corresponding open end. The battery shell of the application is connected with the upper cover and/or the lower cover in a buckling mode through the shell body, so that the assembly speed is improved, transition surfaces are avoided to be arranged between the side wall of the shell body and the upper cover or the lower cover corresponding to the opened end, and the energy density of a battery is improved.

Description

Battery case and battery

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery shell and a battery with the battery shell.

Background

The battery case of the related art includes a case body including a bottom plate and a side plate, and a cover body. The battery case body is generally integrally formed by adopting a stamping process, and because the process is limited by stress concentration, a transition surface is inevitably formed between the bottom plate and the side plate in the process of preparing the battery case body, so that the space corresponding to the transition surface cannot be fully utilized, and the energy density of the battery is reduced.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a battery case, can solve among the prior art because of there is the transition face and lead to space utilization not high, the technical problem that battery energy density is low.

It is a further object of the present application to provide a battery having the above battery case.

According to a first aspect of the present application, there is provided a battery case including: the shell comprises a shell body, wherein an accommodating space is defined in the shell body, the shell body is provided with two open ends, each open end is communicated with the accommodating space, and the shell body is provided with a liquid injection hole and a conductive connecting area; a lower cover at one end of the housing body for closing one open end; an upper cover located at the other end of the housing body for closing the other open end; wherein at least one of the lower cover and the upper cover is snap-fit connected with the housing body when closing the corresponding open end.

According to an embodiment of the present application, the upper cover or the lower cover corresponding to the open end includes: a base at the open end; the lateral part is arranged on the periphery of the bottom, and a containing groove for inserting the shell body is formed between the lateral part and the bottom in a matched mode.

According to an embodiment of the application, the bottom is a plate-shaped member, and the side wall of the case body is disposed perpendicular to the bottom.

According to an embodiment of the application, the bottom and the side are transitionally connected by a first arc-shaped surface.

According to an embodiment of the application, the outer circumference of the open end has a fillet with a radius the same as the radius of the first arc-shaped face.

According to an embodiment of the present application, a thickness of the case body is not smaller than a radius of the first arc-shaped face.

According to an embodiment of the application, the side ring is provided at the periphery of the bottom.

According to an embodiment of the application, the side portion comprises a plurality of straight side portions along the circumferential direction, and two adjacent straight side portions are in transition connection through the second arc-shaped face.

According to an embodiment of the application, the side portion is welded to the housing body.

According to the embodiment of the application, a gap is formed between the outer periphery of the side part and the outer surface of the shell body, the side part is connected with the shell body through laser welding, and a welding seam formed through welding is located in the gap.

According to an embodiment of the application, the side portion is laser welded to the housing body, and a weld seam formed by welding extends through the side portion to the housing body.

According to the embodiment of the application, the outer surface of the shell body comprises a plurality of side surfaces which are connected in sequence, and the areas of the upper cover and the lower cover are respectively larger than the area of any one of the side surfaces.

The battery disclosed in the second aspect of the present application includes: a battery case according to any of the above embodiments, wherein the conductive connection region comprises a positive connection region and a negative connection region; the electrode core is arranged in the accommodating space and comprises an anode tab and a cathode tab, the anode tab is electrically connected with the anode connecting area, and the cathode tab is electrically connected with the cathode connecting area.

According to an embodiment of the application, the pole core is a laminated pole core.

According to an embodiment of the present disclosure, the upper cover, the lower cover and the shell body can be connected by a buckling connection mode, so that the assembly difficulty can be reduced, the assembly efficiency can be improved, the connection between the shell body and the upper cover or between the shell body and the lower cover through a transition surface can be avoided, the influence of the transition surface on the size of the battery is reduced, and the energy density of the battery is improved.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is an exploded view of a prior art battery;

FIG. 2 is a schematic perspective view of a battery housing according to one embodiment provided herein;

FIG. 3 is an exploded view of a battery housing according to one embodiment provided herein;

FIG. 4 is a top view of a battery housing of one embodiment provided herein;

FIG. 5 is a cross-sectional view of a battery housing taken along the A-A direction according to one embodiment provided herein;

FIG. 6 is an enlarged schematic view of the area a circled in FIG. 5;

FIG. 7 is a cross-sectional view taken along the A-A direction of a battery housing according to yet another embodiment provided herein;

FIG. 8 is an enlarged view of the area b circled in FIG. 7;

FIG. 9 is a cross-sectional view of a battery housing of one embodiment provided herein after welding;

FIG. 10 is an enlarged view of area c circled in FIG. 9;

FIG. 11 is a schematic structural view of a housing body of one embodiment provided herein;

FIG. 12 is a top view of a housing body of one embodiment provided herein;

FIG. 13 is a cross-sectional view of a housing body of one embodiment provided herein taken along the direction B-B;

FIG. 14 is a schematic structural view of an upper cover or a lower cover of one embodiment provided herein;

FIG. 15 is a top view of an upper or lower cover of one embodiment provided herein;

FIG. 16 is a cross-sectional view of an upper cover or lower cover of one embodiment provided herein taken along the C-C direction;

FIG. 17 is an enlarged view of area d circled in FIG. 16;

fig. 18 is an enlarged view of the area circled e in fig. 16.

Reference numerals

A battery case 100;

a case body 10; a housing space 11; a liquid injection hole 12; a positive electrode connection region 13; a negative electrode connection region 14; a third arcuate surface 15; an explosion-proof mark 16; a weld 17;

a lower cover 20;

an upper cover 30;

a bottom portion 41; the side portion 42; a first arc-shaped face 43; a second arcuate surface 44;

a rivet assembly 50;

a base plate 1; a side plate 2; a circular arc transition surface 3; a lid 4.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The present application was invented by the inventors based on the following facts.

Fig. 1 shows a battery case in the prior art.

As shown in fig. 1, the battery case includes a case body and a cover 4, the case body includes a bottom plate 1 and a side plate 2, and the bottom plate 1 and the side plate 2 are connected by an arc transition surface 3.

The battery case as above has the following defects: because the shell body consisting of the bottom plate 1 and the side plates 2 is integrally formed by adopting a stamping process, the arc transition surface 3 cannot be avoided in the processing process due to the consideration of avoiding stress concentration in the process, so that the space of the part cannot be fully utilized, and the energy density of the battery is reduced.

Based on this, the inventors of the present application have conducted long-term studies and experiments to creatively develop the following inventions.

As shown in fig. 2 to 18, the battery case 100 according to the embodiment of the present application includes a case body 10, a lower cover 20, and an upper cover 30. As shown in fig. 2, the X direction is the width direction of the battery, the Y direction is the length direction of the battery, and the Z direction is the thickness direction of the battery.

Specifically, the housing body 10 defines an accommodating space 11 therein, the housing body 10 has two open ends, each open end is communicated with the accommodating space 11, the housing body 10 is provided with a liquid injection hole 12 and a conductive connection region, the lower cover 20 is located at one end of the housing body 10 for closing one open end, and the upper cover 30 is located at the other end of the housing body 10 for closing the other open end. Wherein at least one of the lower cap 20 and the upper cap 30 is snap-coupled with the housing body 10 while closing the corresponding open end.

In other words, the battery case 100 according to the embodiment of the present disclosure mainly includes the case body 10 and a cover, the cover may be the lower cover 20 or the upper cover 30, and the battery case 100 may be made of a metal material such as stainless steel, nickel alloy, or chromium alloy. A housing space 11 is formed in the case body 10, and a pole core, which may be a wound pole core or a laminated pole core in the present embodiment, is housed in the housing space 11. The pole core may include a positive electrode tab, a negative electrode tab, and a separator. The case body 10 is provided with a liquid injection hole 12 and a conductive connection area, wherein the electrolyte can be injected into the housing space 11 through the liquid injection hole 12. The conductive connection region may include a positive connection region 13 and a negative connection region 14, the positive connection region 13 may be used for a component provided at a through hole on the case body 10, and the negative connection region 14 may be a partial region on the case body 10. The positive electrode tab on the electrode core can be electrically connected with the positive electrode conductive connecting piece positioned in the positive electrode connecting area 13, and the negative electrode tab on the electrode core can be electrically connected with the inner wall surface of the shell body 10 corresponding to the negative electrode connecting area 14.

The housing body 10 has an open end communicating with the accommodating space 11, and the open end can be closed by a cover body which can be clamped with the housing body 10 when the open end is closed. When the case body 10 has two open ends, a cover body closing the open end of the upper portion of the case body 10 may be used as the upper cover 30, and a cover body closing the open end of the lower portion of the case body 10 may be used as the lower cover 20. Specifically, the case body 10 has two open ends respectively communicating with the housing spaces 11, and the two open ends may be divided into a first open end and a second open end for convenience of description. The first open end may be closed by the lower cover 20, the second open end may be closed by the upper cover 30, and optionally, the lower cover 20 is disposed opposite to the upper cover 30, the receiving space 11 is a linear installation channel, the first open end may be located above the installation channel in the axial direction, and the second open end may be located below the installation channel in the axial direction.

The lower cap 20 may be snapped with the lower end of the housing body 10 while the first open end is closed by the lower cap 20. Likewise, the upper cover 30 may be engaged with the upper end of the housing body 10 while the second open end is closed by the upper cover 30. It should be noted that, when the upper cover 30 is clamped with the housing body 10, the lower cover 20 may be optionally clamped with the housing body 10, or may be optionally connected in other connection manners, for example, an integral structure is formed with the housing body 10 through a stamping process. Similarly, when the lower cover 20 is engaged with the housing body 10, the upper cover 30 can be connected in various ways, which is not described herein. Optionally, the upper cover 30 and the lower cover 20 are both connected with the housing body 10 in a snap-fit manner, and further, on the basis of the snap-fit, the upper cover 30, the lower cover 20 and the housing body 10 can be assembled in an interference fit manner.

In addition, the cover body is buckled with the case body 10, so that the part of the cover body corresponding to the opened end can be directly butted with the side wall of the case body 10, a transition surface is not formed between the cover body and the side wall, and the space inside the battery case 100 can be fully utilized.

Therefore, according to the battery shell 100 provided by the embodiment of the application, the upper cover 30, the lower cover 20 and the shell body 10 can be connected in a clamping manner, so that the assembly difficulty can be reduced, the assembly efficiency can be improved, the shell body 10 and the upper cover 30 or the shell body 10 and the lower cover 20 can be prevented from being connected through a transition surface, the influence of the transition surface on the size of the battery is reduced, and the energy density of the battery is improved.

According to an embodiment of the present application, as shown in fig. 7 and 14, the upper cover 30 or the lower cover 20 corresponding to the open end includes a bottom portion 41 and a side portion 42, the bottom portion 41 is located at the open end, the side portion 42 is disposed at an outer periphery of the bottom portion 41, and a receiving groove for receiving the housing body 10 is cooperatively formed between the side portion 42 and the bottom portion 41. During assembly, the open end of the shell body 10 is inserted into the accommodating groove, and the assembling efficiency is improved by adopting the inserting mode.

In some embodiments of the present application, as shown in fig. 16, the bottom 41 is a plate-shaped member, and in this case, the bottom 41 may be defined as a bottom plate. The side wall of the case body 10 is disposed perpendicular to the bottom 41, and in this case, the extending direction of the plate-shaped member is perpendicular to the side wall of the case body 10, and the thickness of the plate-shaped member may be set to be uniform, for example, the plate-shaped member extends in the horizontal direction, and the side wall of the case body 10 extends in the vertical direction. Alternatively, the bottom 41 of the upper cover 30 and the bottom 41 of the lower cover 20 are perpendicular to the side wall of the housing body 10. It should be noted that, when the bottom portion 41 is vertically connected to the side wall of the case body 10, the utilization rate of the space inside the battery case 100 can be further improved, and the energy density of the battery can be improved in the battery case 100 of the same size. Here, the side portion 42 may also be a plate-shaped member, and in this case, the side portion 42 may be defined as a side plate, and a plate-shaped structure is adopted to facilitate the connection between the side portion 42 and the battery case 100.

According to one embodiment of the present application, as shown in FIG. 18, bottom portion 41 and side portion 42 are transitionally connected by a first arcuate surface 43, wherein the radius of the shell fillet of first arcuate surface 43 may be defined as R1. It should be noted that the smaller the shell fillet radius R1 of the first arc-shaped surface 43, the more difficult the preparation. The case fillet radius R1 of the first arc-shaped surface 43 is too large, which may decrease the space utilization of the battery and decrease the energy density of the battery.

During production, the upper cover 30 and the lower cover 20 can be integrally formed through a stamping process, the stamped structure includes a bottom portion 41 and a side portion 42, and the bottom portion 41 and the side portion 42 are transitionally connected through a first arc-shaped surface 43. The cover body is produced by adopting a stamping process, so that the cover body has the advantage of high processing efficiency.

According to one embodiment of the application, the outer circumference of the open end has a fillet with the same radius as the radius of the first arc-shaped face 43. That is, in the thickness direction of the battery, the peripheries of both ends of the case body 10 are provided with rounded corners, the radius of the rounded corners can be defined as R2, and the provision of the rounded corners can play a role of positioning guide, facilitating the assembly between the cover body and the corresponding open end.

Alternatively, R1 is equal to R2, under which condition, the tight fit between the lid body and the case body 10 can be made, improving the sealing performance of the battery case 100. Optionally, R1 is more than or equal to 0.1mm and less than or equal to 0.3mm, and R2 is more than or equal to 0.1mm and less than or equal to 0.3mm, and by adopting R1 and R2 in the range, the sealing performance of the battery and the energy density of the battery can be ensured while the manufacturing difficulty of the cover body is reduced.

According to an embodiment of the present application, as shown in FIG. 18, the thickness of the corresponding side portion 42 of the upper cover 30 is defined as H1, alternatively, 0.03mm ≦ H1 ≦ 0.1 mm. Likewise, the thickness of the corresponding side portion 42 of the lower cover 20 is defined as H3, alternatively, 0.03mm ≦ H3 ≦ 0.1 mm. When the side 42 of the upper or lower cover 30 or 20 is less than this range, the upper or lower cover 30 or 20 is too weak to be easily deformed. When the thickness of the side portion 42 corresponding to the upper cover 30 or the lower cover 20 is larger than this range, the size of the battery is increased, which is disadvantageous in weight reduction and size reduction of the battery. In practical use, the thicknesses of the corresponding sides 42 of the upper cover 30 and the lower cover 20 may not be equal, and the present application does not specifically limit this. In addition, the thickness of the side portion 42 and the bottom portion 41 of the cover body may be the same or different, and is not limited herein. Note that, when the thickness of the upper cover 30 is uniform, the thickness of the upper cover 30 may also be defined as H1. Similarly, when the thickness of the lower cover 20 is uniform, the thickness of the lower cover 20 may be defined as H3.

In some embodiments of the present application, as shown in FIG. 13, the thickness of the side wall of the housing body 10 is defined as H2, that is, the thickness of the housing body 10 is H2, alternatively, 0.1mm ≦ H2 ≦ 0.3 mm. When the thickness of the side wall is less than this range, the strength of the case body 10 is excessively low, resulting in a decrease in the supporting ability of the case body 10 and the case body 10 being easily deformed. When the thickness of the case body 10 is larger than this range, it is disadvantageous to the light weight and the miniaturization of the battery, and the case body 10 occupies too much effective space of the battery, which is disadvantageous to the improvement of the energy density of the battery.

According to one embodiment of the present application, the thickness of the case body 10 is not smaller than the radius of the first arc-shaped face 43. For convenience of illustration, the thickness of the side wall of the case body 10 may be defined as H2, and the radius of the inner corner of the case of the first arc-shaped surface 43 is defined as R1, that is, H2 is not less than R1, so that the occurrence of a rounded corner in the effective space inside the battery case 100 can be avoided, and the utilization rate of the space inside the battery is improved. Fig. 6 illustrates a case where H2 > R1, and fig. 8 illustrates a case where H2 ═ R1.

In some embodiments of the present application, the side portion 42 is disposed around the periphery of the bottom portion 41, that is, after the housing body 10 is inserted into the cover, the side portion 42 is located outside the housing body 10, which facilitates the connection between the side portion 42 and the housing body 10.

According to an embodiment of the present application, as shown in fig. 3, the side portion 42 includes a plurality of straight side portions along a circumferential direction thereof, and two adjacent straight side portions are transitionally connected by the second arc-shaped surface 44, that is, the side portion 42 includes a plurality of straight side portions along a circumferential direction thereof, each straight side portion also extends substantially along an up-down direction when the side portion 42 extends substantially along the up-down direction, the second arc-shaped surface 44 is disposed between two adjacent straight side portions, and the transitionally connecting of the adjacent straight side plates is realized by the second arc-shaped surface 44. In this embodiment, the cross-section of the side portion 42 may include a vertex of a circular arc, and the vertex may correspond to the second arc surface 44.

Alternatively, the side wall of the housing body 10 may include a plurality of straight side walls along the circumferential direction thereof, and two adjacent straight side walls may be transitionally connected by the third arc-shaped surface 15. Further, the outer contour of the housing body 10 may be consistent with the outer contour of the side portion 42, for example, the outer contour of the housing body 10 is a quasi-rectangular piece, and the outer contour of the side portion 42 is also a quasi-rectangular piece, so that the side portion 42 and the housing body 10 are tightly connected by adopting the structure with the substantially same shape, on one hand, the occupied space can be reduced, the material can be saved, and on the other hand, the sealing effect between the side portion 42 and the housing body 10 can be improved. In manufacturing, the case body 10 may be formed by bending a steel plate and welding the steel plate end to end. The third arc-shaped surface 15 is naturally formed during the bending process of the steel plate because the steel plate has strength. That is to say, when shell body 10 adopts mode preparation such as bending, can produce third arcwall face 15, can reduce shell body 10's the preparation degree of difficulty through adopting mode preparation such as bending shell body 10.

According to one embodiment of the present application, as shown in fig. 3, an explosion vent 16 is provided on the upper cover 30 or the lower cover 20. During charging and discharging of the battery, the pole piece is liable to expand in the thickness direction of the battery, and when the pressure exceeds the upper limit, the battery may explode. Therefore, because the thickness of the bottom part 41 of the explosion-proof mark 16 is smaller than the thickness of other parts, when the internal pressure of the battery is increased, the explosion-proof mark 16 is broken and gas is discharged, so that the explosion of the battery can be prevented, and the safety of the battery is improved. Alternatively, the blast mark 16 is provided outside the bottom 41 of the upper cover 30On the surface, the orientation of the fillet of the explosion-proof mark 16 is the same as the orientation of the fillet of the apex angle of the bottom 41 closest to the explosion-proof mark 16, and when the internal pressure of the battery is too high, the rupture region is more easily diffused to the fillet of the apex angle of the bottom 41 after the explosion-proof mark 16 is ruptured, and the diffusion to the middle part of the battery is avoided. Wherein, the explosion-proof trace 16 can be a circular arc groove, and the length of the circular arc can be ¹ / ₄ Circle to ³ / ₄ And (4) a circle. Blast-proof mark 16 may be provided near any one of the four top corners of bottom 41, which is not limited herein.

In some embodiments of the present application, as shown in fig. 9 and 10, the side portion 42 is welded to the housing body 10, i.e., side welding may be used for encapsulation. Since the side portion 42 is disposed opposite to the side wall of the housing body 10 and has a sufficient welding area therebetween, in this embodiment, the welding area can be increased by welding the side portion 42 and the housing body 10 for encapsulation, thereby reducing the process difficulty.

In this embodiment, the sealing is achieved by side welding. Specifically, the cover body may be fastened to the corresponding open end by an interference fit and fixed by a clamp, for example, the upper cover 30 and the lower cover 20 may be fastened to the case body 10 by an interference fit, and then the cover body and the case body 10 may be sealed by laser welding. The side welding mode adopted in the embodiment can avoid bad welding phenomena such as insufficient solder and the like when other welding modes are adopted, and has good sealing performance.

When the upper cover 30 is engaged with the upper end of the case body 10, as shown in fig. 9, the length of the side portion 42 corresponding to the upper cover 30 in the thickness direction of the battery is H4, and the length area of the side portion 42 of the upper cover 30 is the effective area for battery encapsulation welding. The reliability of packaging and welding can be guaranteed by welding at the position, and the sealing performance of the battery is improved. Similarly, in the thickness direction of the battery, the length of the side portion 42 of the lower cover 20 is H5, and the length area of the lower cover 20 is the effective area for battery package soldering, which is not described herein again.

Optionally, H4 is more than or equal to 0.4mm and less than or equal to 1mm, and H5 is more than or equal to 0.4mm and less than or equal to 1 mm. When the length of the side portion 42 in the thickness direction of the battery is less than this range, the size of the weldable region is reduced, increasing the difficulty of process work. When the length of the side portion 42 is greater than this range, the positive electrode connection region 13 needs to be evacuated, which leads to an increase in the overall thickness of the battery, and is disadvantageous in terms of weight reduction and size reduction of the battery. The length of the side portion 42 corresponding to the upper cover 30 may not be equal to the length of the side portion 42 corresponding to the lower cover 20, and may be specifically set according to actual needs, which is not specifically limited in the present application.

In some embodiments of the present application, a gap is formed between the outer circumference of the side 42 and the outer surface of the case body 10, the side 42 is connected to the case body 10 by laser welding, a part of the weld 17 formed by welding is located in the gap, that is, the length of the side 42 is smaller than the length of the case body 10 in the thickness direction of the battery, and a step is formed between the outer surface of the case body 10 and the outer surface of the side 42. During welding, welding can be performed obliquely, and the light emitting direction and the welding strength can be controlled to form the projection formed by the welding seam 17 at the notch, so that post-processing is not required to be performed on the projection generated by laser welding, and the whole width of the battery case 100 cannot be increased. Wherein the welding direction can be determined according to the size of the notch and the welding strength, and is not limited herein.

In some embodiments of the present application, the side portion 42 is laser welded to the housing body 10, as shown in fig. 10, and the weld 17 formed by the welding extends through the side portion 42 to the housing body 10. In the welding, which may be performed in a horizontal direction, a weld 17 is created, which weld 17 is able to penetrate the side portion 42 and extend into the case body 10, thereby sealing between the cover and the case body 10.

According to an embodiment of the present application, the outer surface of the case body 10 includes a plurality of side surfaces connected in series, the areas of the upper cover 30 and the lower cover 20 are respectively greater than the area of any one of the side surfaces, and by designing the upper cover 30 and the lower cover 20 to have a large-area structure, the occupied space of the battery case 100 can be reduced, and the energy density of the battery can be improved. Specifically, the side wall of the case body 10 may include a plurality of side wall portions adjacent in sequence, for example, two first side wall portions extending in the length direction and two second side wall portions extending in the width direction. The areas of the upper cover 30 and the lower cover 20 may be larger than the area of either one of the side wall portions, respectively. That is, the upper cover 30 and the lower cover 20 correspond to the large faces of the pole cores, respectively, the case body 10 corresponds to the small faces of the pole cores, and the area of the large faces of the pole cores is larger than that of the small faces of the pole cores.

Therefore, according to the battery case 100 of the embodiment of the present application, the case body 10 is connected to at least one of the upper cover 30 and the lower cover 20 in a snap-fit manner, the bottom 41 corresponding to the upper cover 30 or the lower cover 20 is directly connected to the side wall of the case body 10, or even perpendicular to each other, so that a transition surface between the bottom 41 and the side wall of the case body 10 is avoided, the utilization rate of the space inside the battery case 100 can be improved, and the energy density of the battery is improved in the battery cases 100 of the same size. In addition, the packaging can be realized in a side part 42 welding mode, so that the area of a welding area can be increased, and the process difficulty can be reduced.

The application also discloses a battery, which comprises a battery shell 100 and a pole core, wherein the battery shell 100 is the battery shell 100 of any of the above embodiments, the conductive connection region comprises a positive connection region 13 and a negative connection region 14, as shown in fig. 11, the positive connection region 13 can be a component arranged at a through hole on the shell body 10, and the negative connection region 14 can be a partial region on the shell body 10. The pole core is arranged in the accommodating space 11 and comprises a positive pole lug and a negative pole lug which are arranged on the pole core, the positive pole lug is electrically connected with the positive pole connecting area 13, and the negative pole lug is electrically connected with the negative pole connecting area 14. In this embodiment, the pole core may be prepared in a winding or lamination manner.

Wherein, the negative pole utmost point ear can the beading on the inner wall that corresponds with negative pole joining region 14 on shell body 10, specifically, can weld again on the inner wall of negative pole joining region 14 after drawing in the negative pole utmost point ear to it is electric to make between negative pole utmost point ear and the shell body 10.

Alternatively, as shown in fig. 3, the positive conductive connector is a rivet assembly 50, and the rivet assembly 50 and the battery case 100 may be insulated from each other. The positive tab is electrically connected to the rivet assembly 50, the rivet assembly 50 may extend to the outside of the case body 10 through the positive connection region 13 on the case body 10, and the negative tab may be welded to the negative connection region 14 to electrically connect the negative tab to the battery case 100.

According to an embodiment of the present application, the pole core is a laminated pole core, wherein it should be noted that the laminated structure is adopted in the present embodiment because the space utilization rate of the laminated structure is higher. When a lamination structure is adopted, the pole core may include a negative electrode sheet, a separator, and a positive electrode sheet, which are sequentially stacked. For example, the laminated pole core has a substantially cubic shape, and in this case, the battery case 100 mainly enclosed by the lower cover 20, the case body 10, and the upper cover 30 may also have a substantially cubic shape, and the corresponding receiving space 11 may also have a substantially cubic shape so as to be easily adapted to the laminated structure.

In summary, the battery case 100 according to the embodiment of the present application includes the upper cover 30, the case body 10 and the lower cover 20, wherein the lower cover 20 and the upper cover 30 can be connected with the case body 10 in a snap-fit manner, for example, the upper cover 30 and the corresponding bottom 41 are perpendicular to the side wall of the case body 10, so that no transition surface is required between the case body 10 and the bottom 41 of the upper cover 30 and the lower cover 20, the influence of the transition surface on the battery size is reduced, and the energy density of the battery can be improved. Since the battery of the embodiment of the present application includes the battery case 100 of any one of the embodiments, the battery case 100 of the embodiment of the present application has the advantage of a large accommodating space 11 and can accommodate a pole piece with a large energy density.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims (14)

1. A battery case, comprising:

the shell comprises a shell body, wherein an accommodating space is defined in the shell body, the shell body is provided with two open ends, each open end is communicated with the accommodating space, and the shell body is provided with a liquid injection hole and a conductive connecting area;

a lower cover at one end of the housing body for closing one open end;

an upper cover at the other end of the housing body for closing the other open end;

wherein at least one of the lower cover and the upper cover is snap-fit connected with the housing body when closing the corresponding open end.

2. The battery case of claim 1, wherein the upper cover or the lower cover corresponding to the open end comprises:

a base at the open end;

the lateral part is arranged on the periphery of the bottom, and a containing groove for inserting the shell body is formed between the lateral part and the bottom in a matching manner.

3. The battery case as set forth in claim 2, wherein said bottom is a plate-shaped member, and the side wall of said case body is disposed perpendicularly to said bottom.

4. The battery housing of claim 2, wherein the bottom portion and the side portion are transitionally connected by a first arcuate surface.

5. The battery housing of claim 4, wherein an outer periphery of the open end has a radius that is the same as a radius of the first arcuate surface.

6. The battery case according to claim 5, wherein the thickness of the case body is not smaller than the radius of the first arc-shaped face.

7. The battery case of claim 2, wherein the side ring is disposed on an outer periphery of the bottom portion.

8. The battery case as set forth in claim 7, wherein the side portion comprises a plurality of straight side portions along a circumferential direction thereof, and adjacent two straight side portions are transitionally connected by the second arc-shaped face.

9. The battery case as set forth in claim 2, wherein said side portions are welded to said case body.

10. The battery case as set forth in claim 9, wherein a gap is formed between an outer peripheral edge of said side portion and an outer surface of said case body, said side portion is laser welded to said case body, and a weld formed by welding is located at said gap.

11. The battery case as set forth in claim 9, wherein said side portion is laser welded to said case body, and a weld formed by welding extends through said side portion to said case body.

12. The battery case as set forth in claim 1, wherein the outer surface of the case body includes a plurality of side surfaces connected in series, and the areas of the upper cover and the lower cover are respectively larger than the area of any one of the side surfaces.

13. A battery, comprising:

a battery case according to any one of claims 1-12, said electrically conductive connection region comprising a positive electrode connection region and a negative electrode connection region;

the pole core is arranged in the accommodating space and comprises a positive pole lug and a negative pole lug, the positive pole lug is electrically connected with the positive pole connecting area, and the negative pole lug is electrically connected with the negative pole connecting area.

14. The battery of claim 13, wherein the pole core is a laminated pole core.

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