CN216958240U - Battery and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a battery and a battery pack. The battery includes: a battery case; the battery cell is positioned in the battery shell; the inner surface of the battery shell, which is close to the battery core, is provided with a protruding part so as to prevent the battery shell from being electrically connected with the battery core. Through being provided with the bellying in the battery case body, the bellying can be used for keeping apart electric core and electrically conductive foreign matter to this avoids electrically conductive foreign matter to make battery case and electric core form the electricity through the bellying and is connected, thereby can improve the security performance of battery, avoids appearing the battery short circuit risk.

Description

Battery and battery pack

Technical Field

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

Background

In the related art, the shell and the cover plate are insulated from the battery cell through the insulating film, however, the welding position of the shell and the cover plate cannot be provided with the insulating film, so that the insulating film does not cover all the shell and the cover plate, and a large short circuit risk exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery and a battery pack, which are used for improving the performance of the battery.

According to a first aspect of the present invention, there is provided a battery comprising:

a battery case;

the battery cell is positioned in the battery shell;

the inner surface of the battery shell, which is close to the battery core, is provided with a bulge part so as to prevent the battery shell from being electrically connected with the battery core.

The battery comprises a battery shell and a battery core, wherein the battery core is positioned in the battery shell, and the bulge part is arranged in the battery shell and can be used for isolating the battery core from conductive foreign matters, so that the battery shell is prevented from being electrically connected with the battery core through the bulge part by the conductive foreign matters, the safety performance of the battery can be improved, and the short circuit risk of the battery is avoided.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The battery pack comprises a battery, the battery comprises a battery shell and a battery core, the battery core is positioned in the battery shell, and the bulge is arranged in the battery shell and can be used for isolating the battery core and conductive foreign matters, so that the battery shell is prevented from being electrically connected with the battery core through the bulge by the conductive foreign matters, the safety performance of the battery can be improved, and the risk of short circuit of the battery is avoided.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic diagram illustrating an internal structure of a battery according to an exemplary embodiment;

fig. 2 is a schematic view showing an internal structure of a battery according to another exemplary embodiment;

FIG. 3 is a schematic diagram of a battery according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a partial structure of a battery according to an exemplary embodiment;

FIG. 5 is another partial schematic structural view of a battery according to an exemplary embodiment;

FIG. 6 is an exploded partial schematic view of a battery housing of a battery according to an exemplary embodiment;

FIG. 7 is another exploded partial schematic view of a battery housing of a battery according to an exemplary embodiment;

FIG. 8 is a schematic diagram illustrating a partial structure of a battery according to an exemplary embodiment;

fig. 9 is a schematic diagram illustrating a structure of a protrusion of a battery according to an exemplary embodiment.

The reference numerals are explained below:

10. a battery case; 11. a boss portion; 111. a weakened portion; 12. a connection region; 121. a gap; 13. a groove; 14. a first housing member; 141. a first flanged edge; 15. a second housing member; 151. a second flanged edge; 16. a flange structure; 17. a first surface; 18. a second surface; 19. recessing; 20. an electric core; 21. a cell main body; 22. a tab; 23. a pole assembly; 30. an insulating section.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, referring to fig. 1 to 9, the battery includes: a battery case 10; a cell 20, the cell 20 being located within the battery case 10; the inner surface of the battery case 10 close to the battery core 20 is provided with a protrusion 11 to avoid electrical connection between the battery case 10 and the battery core 20.

The battery of one embodiment of the utility model comprises a battery shell 10 and a battery core 20, wherein the battery core 20 is positioned in the battery shell 10, and the bulge part 11 is arranged in the battery shell 10, so that the bulge part 11 can be used for isolating the battery core 20 from conductive foreign matters, thereby preventing the conductive foreign matters from forming electric connection between the battery shell 10 and the battery core 20 through the bulge part 11, improving the safety performance of the battery and avoiding the risk of short circuit of the battery.

In one embodiment, as shown in fig. 8, the battery cell 20 may include a cell main body 21 and a tab 22, where the tab 22 extends from a length direction of the cell main body 21; the tab 22 is connected to the pole assembly 23, as shown in fig. 3 and 4, the pole assembly 23 can be disposed at an end of the battery case 10, so that the connection is facilitated, and the length and space of the battery can be fully utilized. The tab 22 and the post assembly 23 may be directly connected, that is, the tab 22 and the post assembly 23 may be directly welded, or the tab 22 and the post assembly 23 may be connected by a metal adapter, and the specific connection mode may be welding, or riveting, and the like, and the connection mode is not limited herein.

The battery core main body 21 comprises more than two pole pieces, the tab 22 comprises more than two single-piece tabs, the single-piece tabs respectively extend out from the corresponding pole pieces, the width of each single-piece tab is smaller than that of each pole piece, a plurality of single-piece tabs are stacked to form the tab 22 and connected with the pole assembly 23, and the tab 22 can be welded with the pole assembly 23. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

The protrusions 11 are provided to prevent conductive foreign matters from connecting the battery case 10 with the tab 22 through the protrusions 11.

In some embodiments, there may be two pole assemblies 23, two pole assemblies 23 are a positive pole assembly and a negative pole assembly, respectively, there are two tabs 22, two tabs 22 are a positive tab and a negative tab, respectively, the positive tab is connected with the positive tab, and the negative tab is connected with the negative tab.

In one embodiment, the battery housing 10 may be provided with a recess 19, and the pole assembly 23 may be disposed within the recess 19. Alternatively, as shown in fig. 3 to 5, the recess 19 and the pole assembly 23 are respectively disposed on two opposite sides of the battery housing 10, and the recess 19 may be used for accommodating the pole assembly of another battery.

It should be noted that the battery case 10 may be a metal case, for example, the battery case 10 may be an aluminum case, or the battery case 10 may be a steel case.The protruding portion 11 may be a metal structure, the protruding portion 11 may not be subjected to an insulation treatment, and the main function of the protruding portion 11 is to prevent conductive foreign matters from passing through the protruding portion 11 to electrically connect the battery case 10 and the battery cell 20, and therefore, the protruding portion 11 as the metal structure is mainly used to block the conductive foreign matters. Alternatively, the boss 11 may be subjected to an insulating treatment, for example, the boss 11 may be provided with a coating such as alumina (Al)₂O₃) Zirconium oxide (ZrO)₂) And the like.

In one embodiment, the battery casing 10 is formed with an edge region, and the protruding portion 11 is located on a side of the battery cell 20 close to the edge region, that is, the protruding portion 11 is located between the battery cell 20 and the edge region, so as to avoid the battery casing 10 and the battery cell 20 being connected by a conductive foreign matter.

The edge region may be considered as a portion to which the battery case 10 is not attached with internal insulation, or a portion to which the battery case 10 is insulated with a risk of failure. As shown in connection with fig. 1 and 2, the edge region may include a connection region 12 and a gap 121.

The battery case 10 may be an integrally formed structure, but in order to achieve the sealing of the battery cell 20, the battery case 10 necessarily has a connection region 12, i.e., two opposite structures are connected, so as to form a space for accommodating the battery cell 20. Alternatively, the battery case 10 may be formed by splicing at least two structures, and in this case, the structures must be connected to each other, thereby forming the connection region 12. When the structures are connected, for example, when the structures are welded, the welding slag may form conductive foreign matters, and the protruding portion 11 may prevent the welding slag from communicating the battery cell 20 and the battery case 10. Further, in order to facilitate the connection between the structures, the connection region 12 is inconvenient to perform an insulation process, and at this time, the protrusion 11 is located on the side of the battery cell 20 close to the connection region 12 to avoid conductive foreign matters from causing the battery cell 20 to be electrically connected with the battery case 10.

In an embodiment, the protruding portion 11 is disposed on the large surface of the battery case 10, the protruding portion 11 is located at a position on the large surface close to the edge to avoid the battery cell 20, the protruding portion 11 may not only prevent the battery case 10 from forming an electrical connection with the battery cell 20, but also the protruding portion 11 may be used for limiting the position of the battery cell 20, so as to facilitate the installation of the battery cell 20, and further, the protruding portion 11 may reinforce the battery case 10, so as to improve the strength of the battery case 10.

It should be noted that, as shown in fig. 3 to 5, the battery case 10 includes two opposite first surfaces 17 and four second surfaces 18 disposed around the first surfaces 17, that is, the battery case 10 has an approximately rectangular structure, and the area of the first surfaces 17 is larger than that of the second surfaces 18. The two opposing first surfaces 17 are large surfaces of the battery case 10, and the four second surfaces 18 are small surfaces of the battery case 10, the four second surfaces 18 including two pairs of small surfaces, i.e., a first pair of small surfaces extending in a length direction of the battery case 10, and a second pair of small surfaces extending in a width direction of the battery case 10, and an area of the first pair of small surfaces is larger than an area of the second pair of small surfaces, but is smaller than an area of the large surfaces.

The battery case 10 is provided with a convex portion 11 on a large surface thereof, where the large surface of the battery case 10 is an inner surface of the battery case 10, i.e., an inner surface disposed opposite to the first surface 17.

In an embodiment, as shown in fig. 6 and 8, protruding portions 11 are disposed on two opposite sides of the battery cell 20, the protruding portions 11 are located on the same surface of the battery case 10, the protruding portions 11 can be located away from the battery cell 20, which can not only prevent the battery case 10 from being electrically connected to the battery cell 20, but also prevent the protruding portions 11 from being used for limiting the battery cell 20, thereby facilitating the installation of the battery cell 20, and fixing the battery cell 20 to a certain extent.

The opposite sides of the battery cell 20 are provided with the protruding portions 11, so that the structural stability of the battery case 10 can be improved, and the protruding portions 11 can be symmetrically arranged on the battery case 10. The opposite sides of the battery cell 20 may be provided with one integral protrusion 11, or the opposite sides of the battery cell 20 may be provided with a plurality of separate protrusions 11.

In an embodiment, as shown in fig. 8, the battery cell 20 includes a cell main body 21 and a tab 22, where a direction in which the tab 22 extends from a side surface of the cell main body 21 is slightly parallel to an extending direction of the protrusion 11, so that the protrusion 11 can limit the cell main body 21, and the tab 22 can be effectively prevented from being electrically connected with a portion of the tab 22 in the extending direction.

Pole subassembly 23 can set up on first surface 17, and two utmost point ear 22 extend by two relative sides of electric core main part 21, pole subassembly 23 forms the electricity with utmost point ear 22 and is connected, utmost point ear 22 draws forth from battery housing 10's big surface promptly, furthermore, the junction of pole subassembly 23 and utmost point ear 22 can be provided with insulating support, consequently, draw forth the insulating inefficacy risk of direction vertically with utmost point ear and be bigger, so, utmost point ear 22 is slightly parallel by the extending direction of the direction that the side of electric core main part 21 extended out and bellying 11, can effectively avoid utmost point ear 22 and utmost point ear 22 to draw forth the part formation electricity of direction and be connected.

In one embodiment, as shown in fig. 6 and 8, the battery further includes an insulating part 30, the insulating part 30 is disposed on the battery case 10, and the battery cell 20 is pressed on the insulating part 30, so that the insulating part 30 is used to avoid the battery cell 20 from forming an electrical connection with the battery case 10. Since the insulation portion 30 is not disposed at the connection region 12 to facilitate connection of the battery case 10, the battery case 10 and the battery cell 20 may be prevented from being connected by conductive foreign matter by locating the protrusion 11 at a side of the battery cell 20 close to the connection region 12.

In one embodiment, the protruding portion 11 may be provided with the insulating portion 30, that is, the outer surface of the protruding portion 11 may be provided with the insulating portion 30, so that the electrical connection between the battery cell 20 and the protruding portion 11 may be avoided, thereby further improving the insulating performance of the protruding portion 11. The insulating portion 30 may be an insulating film, and the mounting of the insulating film on the protruding portion 11 is also easy. The insulating film can be arranged by spraying, pasting and other processes. The insulating portion 30 may be an insulating coating, such as alumina (Al)₂O₃) Zirconium oxide (ZrO)₂) And the like.

In one embodiment, at least a portion of the insulating portion 30 is disposed on a side of the protruding portion 11 facing the battery cell 20, so that the battery cell 20 and the protruding portion 11 can be prevented from forming an electrical connection, thereby further improving the insulating performance of the protruding portion 11.

The insulation part 30 may completely cover the protrusion part 11, or the insulation part 30 may cover a portion of the protrusion part 11.

In one embodiment, the insulation 30 covers a portion of the boss 11; the area of the insulating part 30 covering the protruding part 11 is not less than half of the area of the outer surface of the protruding part 11, so that the insulating part 30 can reliably insulate the battery case 10 from the battery cell 20.

The boss 11 may be in the shape of a triangular pyramid, and the area of the insulation part 30 covering the boss 11 is not less than half of the outer surface area of the boss 11, i.e., one end of the insulation part 30 may exceed the tip of the triangular pyramid, as shown in fig. 4.

In one embodiment, as shown in fig. 1, 2 and 9, the protruding part 11 is provided with a weak part 111, so that when the internal pressure of the battery case 10 reaches a preset value, the weak part 111 can be broken, thereby enabling the protruding part 11 to be used as an explosion-proof valve, thereby ensuring the safety performance of the battery.

In some embodiments, the protruding portion 11 and the weak portion 111 may be separately provided, for example, a through hole may be formed on the protruding portion 11, the weak portion 111 may be provided to block the through hole, and the weak portion 111 may be welded on the protruding portion 11, or the weak portion 111 may be adhered on the protruding portion 11, so that during the use of the explosion-proof valve, when the internal pressure of the use environment reaches a certain degree, at least a part of the weak portion 111 may be separated from the protruding portion 11, or the weak portion 111 may also be exploded from an intermediate position, so as to implement pressure relief, thereby ensuring the pressure relief function of the explosion-proof valve.

In one embodiment, the protruding portion 11 and the weak portion 111 are formed integrally, which not only has a simple structure, but also can improve the forming efficiency of the explosion-proof valve.

The bulge part 11 and the weak part 111 are of an integrally formed structure, for example, part of the bulge part 11 can be thinned to form the weak part 111, the weak part 111 can be a notch, and the notch can be one or more, so that the explosion-proof requirement is met, and the pressure relief effect is achieved. Alternatively, the boss 11 may be locally thinned during the molding process to serve as the weak portion 111, thereby achieving the pressure relief function, and the process is relatively simple, so that the molding efficiency of the explosion-proof valve may be improved.

In one embodiment, the battery case 10 and the boss 11 are integrally formed, so that the forming efficiency of the explosion-proof valve can be further improved, and the structural stability can be ensured. .

In one embodiment, as shown in fig. 3 and 4, the battery case 10 is stamped to form the protruding portion 11 so as to form the groove 13 outside the battery case 10, and the stamping process is used to form the protruding portion 11 and the groove 13, so that not only is the process simple and the processing difficulty low, but also the stretching deformation of the structure is realized in the stamping process, so that the weak portion 111 is formed on the protruding portion 11, that is, in the stamping process, a locally thin structure can be generated, and this portion can be used as the weak portion 111, so as to improve the forming efficiency of the explosion-proof valve, ensure the pressure relief effect of the explosion-proof valve, and avoid the safety problem of the explosion-proof valve in the use process.

In one embodiment, the minimum thickness of the weak portion 111 is 0.05mm-0.2mm, which not only ensures that the weak portion 111 can be effectively exploded under a preset pressure, but also enables the weak portion 111 to have a certain strength, thereby avoiding the occurrence of mistaken damage of the weak portion 111, and thus ensuring that a reliable explosion-proof function can be realized. Further, the weak portion 111 is too thick to be easily burst, and the weak portion 111 is too thin to be easily burst at a certain pressure.

The thickness of the weak portion 111 may be uniform, or the thickness of the weak portion 111 may include at least two portions having different thicknesses.

In some embodiments, the minimum thickness of the weakened portion 111 may be 0.05mm, 0.06mm, 0.07mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.195mm, or 0.2mm, and so forth.

In one embodiment, the depth of the groove 13 is 0.1mm-3mm, and the port width of the groove 13 is 0.5mm-5mm, so that the bulge 11 can be prevented from occupying a large space due to an excessive volume, and the bulge 11 can be ensured to have a reliable explosion-proof function.

In some embodiments, the depth of the groove 13 may be 0.1mm, 0.15mm, 0.2mm, 0.5mm, 1mm, 1.1mm, 1.5mm, 1.6mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, or 3mm, and so forth.

In some embodiments, the groove 13 may have a port width of 0.5mm, 0.6mm, 0.7mm, 1mm, 1.1mm, 1.5mm, 1.6mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 4.9mm, or 5mm, and so forth.

In some embodiments, the inner surface of the groove 13 may include at least one of a curved surface and a flat surface, for example, the groove 13 may be an arc-shaped groove, the groove 13 may be a polygonal groove, for example, the groove 13 may be a rectangular groove, the groove 13 may be a triangular groove, and the like, which are not limited herein.

In one embodiment, the cross section of the groove 13 is triangular, that is, the protrusion 11 is further triangular and conical, and the cross section of the groove 13 is triangular, so that the structure is simple and the forming efficiency can be improved.

In one embodiment, at least a portion of the weak portion 111 is located at the top end of the boss 11, and considering that the cross section of the groove 13 is triangular, the top end of the boss 11 can be made to form stress concentration, so that the strength of the top end of the boss 11 is relatively weak, and the weak portion can be used as the weak portion 111, thereby improving the explosion-proof performance of the explosion-proof valve.

It should be noted that, in the process of forming the protruding portion 11, a stamping process may be adopted, so that the protruding portion 11 having a triangular cone shape may be conveniently formed, that is, the groove 13 is a triangular groove, and stress concentration may occur at a pointed tip of the protruding portion 11, and the tip strength of the protruding portion 11 is relatively weak, so that the protruding portion may be used as the weak portion 111, thereby improving the explosion-proof performance of the explosion-proof valve.

In one embodiment, the thickness of the protruding portion 11 is smaller than the minimum thickness of the battery case 10, and the thickness of the weak portion 111 is smaller than the minimum thickness of the protruding portion 11, so that the weak portion 111 can be reliably broken during use, thereby ensuring the explosion-proof efficiency of the explosion-proof valve and improving the use performance of the explosion-proof valve.

In one embodiment, the battery case 10 is made of a metal material, for example, the body may be made of aluminum, steel, copper or nickel, which is not limited herein. Further, the protruding portion 11 and the weak portion 111 may be made of aluminum, steel, copper, or nickel.

In one embodiment, as shown in fig. 6 and 7, the battery case 10 includes: a first housing piece 14; and a second housing part 15, wherein the second housing part 15 is connected with the first housing part 14 to enclose the battery cell 20. The second housing member 15 is provided separately from the first housing member 14, and can be easily molded, thereby improving manufacturing efficiency.

In one embodiment, as shown in fig. 6 and 7, the first housing member 14 is a flat plate, the second housing member 15 is formed with a receiving cavity, and the protrusion 11 is disposed on the first housing member 14, so that not only can the formation of the protrusion 11 be facilitated, but also the electrical connection between the battery cell 20 and the battery case 10 through conductive foreign matter can be effectively avoided. The flat plate does not exclude a certain receiving space, but the height of the receiving space is substantially negligible, which does not affect the placement of the cells 20.

In one embodiment, as shown in fig. 6 and 7, the first shell member 14 is provided with a first flange 141 on the circumferential edge thereof, the second shell member 15 is provided with a second flange 151 on the circumferential edge thereof, and the first flange 141 and the second flange 151 are welded to form the flange structure 16; the protruding portion 11 is located on one side of the battery cell 20 close to the flange structure 16, so that the protruding portion 11 is located between the battery cell 20 and the flange structure 16, thereby effectively preventing conductive foreign matters from conducting the battery cell 20 and the flange structure 16.

The first housing part 14, the second housing part 15, the first flange 141 and the second flange 151 enclose an edge region, which includes the connection region 12 and the gap 121, and in order to facilitate molding of the battery housing 10, the edge region is not covered by the insulating part 30, so that there is an insulation risk, and the protrusion 11 is located between the battery cell 20 and the edge region to prevent the battery housing 10 and the battery cell 20 from being connected by conductive foreign matter.

The position where the first flange 141 and the second flange 151 are welded is the connection region 12, and in order to ensure the welding capability of the first flange 141 and the second flange 151, the first flange 141 and the second flange 151 are not covered with an insulating film, so that the protruding portion 11 in this embodiment can prevent conductive foreign matters from communicating the battery cell 20 and the flange structure 16.

In one embodiment, the first housing piece 14 is provided with the protruding portion 11, and the height of the protruding portion 11 is not less than the vertical distance between the surface of the first housing piece 14 provided with the protruding portion 11 and the second flange 151, so that the protruding portion 11 can effectively prevent conductive foreign matters from communicating the battery cell 20 and the battery case 10.

In one embodiment, the connection region 12 is formed between the first flange edge 141 and the second flange edge 151, the receiving cavity is formed in at least one of the first housing piece 14 and the second housing piece 15, the insulating part 30 is not disposed between the receiving cavity and the connection region 12, and the receiving cavity is used for receiving the battery cell 20, so that there is a risk of insulation failure between the battery cell 20 and the battery case 10.

It should be noted that the insulation portion 30 may not be disposed between the receiving cavity of the first shell member 14 and the connecting region 12, and as shown in fig. 6, the insulation portion 30 covers the first shell member 14, and the portion below the insulation portion 30 may be regarded as the receiving cavity of the first shell member 14, and at this time, the insulation portion 30 is not disposed between the receiving cavity and the circumferential edge of the first shell member 14, and therefore, the protruding portion 11 may be disposed on the first shell member 14. Accordingly, it is also possible to explain in the above-described manner that no insulation 30 is provided between the receiving space formed by the second housing part 15 and the connection region 12.

In one embodiment, the height of the protruding portion 11 is not less than the height from the position where the insulation portion 30 is not disposed on the second housing member 15 to the first flange 141, so that the top end of the protruding portion 11 may be beyond the position where the insulation portion 30 is not disposed on the second housing member 15, or the top end of the protruding portion 11 may be flush with the position where the insulation portion 30 is not disposed on the second housing member 15, so that the protruding portion 11 effectively prevents conductive foreign matters from communicating the battery cell 20 and the battery case 10. For example, the second housing member 15 is formed with the receiving cavity, and the surface of the receiving cavity where the opening is located is not provided with the insulating portion 30, the vertical distance between the surface of the receiving cavity where the opening is located and the first flange 141 needs to be equal to or less than the height of the protruding portion 11. Further, the surface of the opening of the receiving cavity may be regarded as the inner surface of the second flange 151, and the vertical distance between the second flange 151 and the first flange 141 is required to be less than or equal to the height of the boss 11.

In one embodiment, the first housing piece 14 is provided with the protruding portion 11, and the protruding portion 11 is spaced apart from the second housing piece 15, so that the protruding portion 11 can be prevented from interfering with the second housing piece 15, and the first housing piece 14 and the second housing piece 15 can be reliably connected.

In one embodiment, the first housing piece 14 is provided with a protruding portion 11, and the protruding portion 11 is in contact with the second housing piece 15, or the protruding portion 11 is in contact with the second flange 151, so that the protruding portion 11 effectively isolates a portion of the connection region 12 from the battery cell 20, thereby ensuring that the battery cell 20 is not electrically connected to the battery housing 10 through conductive foreign matter.

In one embodiment, the first housing member 14 is provided with the protruding portion 11, and the center line of the protruding portion 11 coincides with the plane where the second flange edge 151 is close to the edge of the second housing member 15, so that the internal space of the battery case 10 occupied by the protruding portion 11 can be reduced, and the protruding portion 11 can have reliable insulating capability.

In one embodiment, as shown in fig. 1 and 2, the battery case 10 is formed with an edge region including the connection region 12 and the gap 121, the gap 121 is formed between the protrusion 11 and the connection region 12, and the protrusion 11 is provided with the weak portion 111 at a side toward the gap 121, so that the gas filled in the gap 121 can be allowed to break the weak portion 111 at a preset pressure.

It should be noted that after the second housing piece 15 is connected to the first housing piece 14, a certain gap 121 may exist between the protruding portion 11 and the connection region 12, so that gas is stored in the space inside the flange edge, and the insulating portion 30 covers a part of the protruding portion 11 and covers one side of the protruding portion 11 close to the battery cell 20, at this time, the weak portion 111 may be located on the other side of the protruding portion 11 away from the battery cell 20, so that the edge of the protruding portion 11 close to the flange edge may be more easily exploded due to the fact that the insulating portion 30 is not covered.

In one embodiment, the length of the cell is a, 400mm a 2500mm, the width of the cell is b, the height of the cell is c, 2b a 50b, and/or 0.5c b 20 c.

Furthermore, b is more than or equal to 50mm and less than or equal to 200mm, and c is more than or equal to 10mm and less than or equal to 100 mm.

Preferably, 4 b.ltoreq.a.ltoreq.25 b, and/or 2 c.ltoreq.b.ltoreq.10 c.

In the battery in the above embodiment, the ratio of the length to the width of the battery is large, and further, the ratio of the width to the height of the battery is large, while sufficient energy density is ensured.

In one embodiment, the length of the battery is a, the width of the battery is b, and a is greater than or equal to 4b and less than or equal to 7b, i.e., the ratio of the length to the width of the battery in the embodiment is larger, so that the energy density of the battery is increased, and the subsequent formation of the battery module is facilitated.

In one embodiment, the height of the battery is c, b is more than or equal to 3c and less than or equal to 7c, and the ratio of the width to the height of the battery is larger, so that the battery is convenient to form under the condition of ensuring enough energy density.

Alternatively, the length of the cell may be 500mm to 1500mm, the width of the cell may be 80mm to 150mm, and the height of the cell may be 15mm to 25 mm.

The length of the battery is a dimension in the battery length direction, the width of the battery is a dimension in the battery width direction, and the height of the battery is a dimension in the battery height direction, that is, the thickness of the battery.

The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacking portion, wherein the stacking portion comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive electrode, the second pole piece is a negative electrode. And the polarities of the first pole piece and the second pole piece can be interchanged.

In one embodiment, the batteries are laminated batteries, which are convenient to pack and can be processed to obtain batteries with longer length.

Specifically, the battery cell 20 may be a laminated battery cell, and the battery cell 20 has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Optionally, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

An embodiment of the utility model also provides a battery pack comprising the battery.

The battery pack of one embodiment of the present invention includes a battery, the battery includes a battery case 10 and a battery cell 20, the battery cell 20 is located in the battery case 10, and the protrusion 11 is disposed in the battery case 10, so that the protrusion 11 can be used to isolate the battery cell 20 from conductive foreign matters, thereby preventing the conductive foreign matters from forming an electrical connection between the battery case 10 and the battery cell 20 through the protrusion 11, and thus improving the safety performance of the battery and avoiding the risk of a short circuit of the battery.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate for fixing the plurality of batteries.

It should be noted that a plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed through the end plate and the side plate. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (19)

1. A battery, comprising:

a battery case (10);

a battery cell (20), the battery cell (20) being located within the battery housing (10);

wherein the inner surface of the battery shell (10) close to the battery core (20) is provided with a bulge (11) to avoid the battery shell (10) being electrically connected with the battery core (20).

2. The battery according to claim 1, characterized in that the battery case (10) is formed with an edge region, and the protrusion (11) is located between the battery cell (20) and the edge region to avoid connection of the battery case (10) and the battery cell (20) by a conductive foreign matter.

3. The battery according to claim 2, wherein a large surface of the battery case (10) is provided with a convex portion (11), and the convex portion (11) is located at a position where the large surface is close to an edge.

4. The battery according to claim 3, characterized in that the protrusions (11) are provided on opposite sides of the cell (20), and the protrusions (11) are located on the same surface of the battery case (10).

5. The battery according to any one of claims 1 to 4, characterized in that the outer surface of the protruding portion (11) is provided with an insulating portion (30).

6. The battery according to claim 5, wherein at least part of the insulating portion (30) is provided on a side of the protruding portion (11) facing the battery cell (20).

7. The battery according to claim 6, wherein the insulating portion (30) covers a part of the protruding portion (11);

wherein the area of the insulation part (30) covering the boss part (11) is not less than half of the area of the outer surface of the boss part (11).

8. The battery according to any one of claims 1 to 4, wherein the protrusion (11) is provided with a weak portion (111) so that the weak portion (111) can be broken when the internal pressure of the battery case (10) reaches a preset value.

9. The battery according to claim 8, wherein the battery case (10) is formed with an edge region including a connection region (12) and a gap (121), the gap (121) being formed between the protruding portion (11) and the connection region (12), and a side of the protruding portion (11) facing the gap (121) is provided with the weak portion (111).

10. The battery according to any one of claims 1 to 4, wherein the battery case (10) and the boss (11) are of an integrally molded structure.

11. The battery according to claim 10, wherein the battery case (10) is stamped to form the boss (11) to form a groove (13) outside the battery case (10).

12. The battery according to any one of claims 1 to 4, wherein the battery case (10) comprises:

a first housing piece (14);

a second housing part (15), wherein the second housing part (15) is connected to the first housing part (14) in order to enclose the electrical core (20);

a first flange edge (141) is arranged on the circumferential edge of the first shell piece (14), a second flange edge (151) is arranged on the circumferential edge of the second shell piece (15), and the first flange edge (141) and the second flange edge (151) are welded to form a flange structure (16);

wherein the bulge (11) is located on a side of the cell (20) adjacent to the flange structure (16) such that the bulge (11) is located between the cell (20) and the flange structure (16).

13. The battery according to claim 12, wherein the first case member (14) is provided with the protruding portion (11), and a height of the protruding portion (11) is not less than a vertical distance between a surface of the first case member (14) on which the protruding portion (11) is provided and the second flange edge (151).

14. The battery according to claim 13, wherein a connection region (12) is formed between the first flange edge (141) and the second flange edge (151), at least one of the first case member (14) and the second case member (15) is formed with a receiving cavity, and no insulating part (30) is provided between the receiving cavity and the connection region (12);

wherein the height of the bulge (11) is not less than the height of the second housing part (15) to the first flange edge (141) where the insulation part (30) is not provided.

15. The battery according to claim 12, wherein the first case member (14) is provided with the protruding portion (11), and the protruding portion (11) is provided at a distance from the second case member (15).

16. The battery according to claim 12, wherein the first case member (14) is provided with the protruding portion (11), and the protruding portion (11) is in contact with the second case member (15), or the protruding portion (11) is in contact with the second flange (151).

17. The battery according to claim 12, wherein the first housing member (14) is provided with the protruding portion (11), and a center line of the protruding portion (11) coincides with a plane in which the second flange edge (151) is located near the edge of the second housing member (15).

18. The battery according to any one of claims 1 to 4, wherein the battery case (10) comprises:

a first housing piece (14);

a second housing part (15), wherein the second housing part (15) is connected to the first housing part (14) in order to close the electrical core (20);

the first shell piece (14) is a flat plate, and the bulge (11) is arranged on the first shell piece (14).

19. A battery pack characterized by comprising the battery of any one of claims 1 to 18.

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