Battery shell and single battery

Abstract

The utility model discloses a battery shell and a single battery, the battery shell comprises a main shell and a cover body, the main shell comprises an accommodating cavity for accommodating a core package and an opening communicated with the accommodating cavity, and the side wall of the main shell is provided with a bulge extending towards the accommodating cavity; the cover body is connected with the main shell in a welded mode and covers the opening of the containing cavity, the cover body is inserted into the containing cavity along the opening, and at least part of the cover body abuts against the protrusion so as to position the main shell and the cover body. According to the embodiment of the utility model, the main shell is provided with the bulge, and the bulge is propped against the cover body for limiting, so that the welding of the main shell and the cover body can be facilitated, and as the main shell and the cover body are not provided with flange edges, the length and the width of the battery shell are reduced, and the energy density of the single battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell and a single battery. Background Art

[0002] In recent years, with the development of battery technology and the improvement of people's living standards, digital products, power tools and electric toys require larger and larger core pack capacity. Aluminum-plastic film soft pack batteries occupy a large space due to the need for packaging of aluminum-plastic film. In order to increase the capacity, metal shell core packs are gradually being designed. Metal shell core packs usually consist of two parts: a main shell and a cover body that are connected to each other.

[0003] At present, the general method adopted by the industry in the design of the main shell and the cover is: the main shell and the cover are formed with flange edges, and after the core pack is placed in the accommodating cavity of the main shell, the main shell and the cover are connected by welding or bonding to form a seal. The flange edge will increase the length and width of the main shell and the cover, thereby reducing the energy density of the battery. Utility Model Content

[0004] One purpose of the utility model is to provide a battery housing and a single cell, which are intended to reduce the length and width of the battery housing and improve the energy density of the single cell.

[0005] In order to achieve the above object, the utility model provides a solution: a battery housing, comprising:

[0006] A main shell, comprising an accommodating cavity for accommodating the core package and an opening communicating with the accommodating cavity, wherein a side wall of the main shell is provided with a protrusion extending toward the accommodating cavity; and

[0007] A cover body is connected to the main shell and covers the opening of the accommodating cavity. The cover body is inserted into the accommodating cavity along the opening and at least partially abuts against the protrusion to position the main shell and the cover body.

[0008] Optionally, the main shell includes a main bottom wall and a plurality of main side walls, the plurality of main side walls and the main bottom wall are connected and jointly enclosed to form the accommodating cavity, the plurality of main side walls are enclosed to form the opening, and the protrusion is provided on the plurality of main side walls;

[0009] The cover body comprises a cover top wall and a plurality of cover side walls, the edges of the plurality of cover side walls and the cover top wall are connected, and the protrusion abuts against a side of the cover side wall away from the cover top wall.

[0010] Optionally, there are multiple protrusions, and the multiple protrusions are arranged on the main side wall at intervals, and the heights of the multiple protrusions from the main bottom wall are equal.

[0011] Optionally, the main bottom wall is arranged in a polygonal shape, and there are multiple protrusions, and multiple protrusions are arranged near the top corners of the main shell.

[0012] Optionally, the protrusions include at least two types of protrusions having different cross-sectional shapes, and the cross-sectional shapes of the protrusions arranged adjacent to the same vertex are the same.

[0013] Optionally, the protrusion includes a first protrusion and a second protrusion having different cross-sectional shapes, and each of the main side walls is provided with the first protrusion and the second protrusion.

[0014] Optionally, the cross-section of the first protrusion is in the shape of an elongated strip, the length direction of the first protrusion is parallel to the plane direction of the main bottom wall, the cross-section of the second protrusion is in the shape of a circle, and the number of the second protrusions arranged on the same main side wall is two, and the two second protrusions are arranged at intervals along the length direction of the first protrusion.

[0015] Optionally, the main shell is provided with a pole hole, the pole hole is used to assemble a pole, and the opening and the pole hole are respectively arranged on two adjacent sides of the main shell.

[0016] Optionally, the main shell has a horizontal direction and a height direction perpendicular to each other, the main shell is provided with the opening in the height direction, the main shell is provided with the pole hole in the horizontal direction, the height of the main shell in the height direction is D, and the length of the main shell in the horizontal direction is H, D <H。

[0017] To achieve the above object, the utility model provides a solution: a single cell battery, the single cell battery comprising: a core pack and a battery shell as described above, the core pack being arranged in the accommodating cavity of the battery shell.

[0018] The beneficial effects of the utility model are:

[0019] The embodiment of the utility model can facilitate the welding of the main shell and the cover body by arranging a protrusion on the main shell and using the protrusion to abut the cover body for limiting. Moreover, since the main shell and the cover body do not have flange edges, the length and width dimensions of the main shell and the cover body are reduced, and the energy density of the single battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a single cell provided in an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of a single cell in FIG.

[0023] Figure 3 It is a schematic diagram of the exploded structure of the battery housing provided by the embodiment of the utility model;

[0024] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of the main shell;

[0025] Figure 5 yes Figure 3 A schematic diagram of the three-dimensional structure of the cover body and an enlarged schematic diagram of the structure at circle A;

[0026] Figure 6 yes Figure 1 A schematic cross-sectional view of a single cell in FIG.

[0027] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of region B;

[0028] Figure 8 yes Figure 4 Schematic diagram of the enlarged structure of the C region;

[0029] Fig. 9 yes Figure 4 Schematic diagram of the enlarged structure of the D area.

[0030] Explanation of the accompanying drawings: 00, single cell; 100, core pack; 200, battery case; 10, main shell; 121, opening; 122, protrusion; 122a, first protrusion; 122b, second protrusion; 123, pole hole; 124, main side wall; 125, main bottom wall; 20, cover body; 21, cover top wall; 22, cover side wall; 30, pole; 210, accommodating cavity. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0034] See also Figure 1 and Figure 2 , Figure 1 00 is a three-dimensional structural diagram of a single cell 00 provided in an embodiment of the utility model. Figure 2 yes Figure 1 The present invention provides a single battery 00 , which includes a core pack 100 and a battery case 200 . The core pack 100 is assembled in a receiving cavity 210 of the battery case 200 .

[0035] Specifically, the single cell 100 can be a lithium battery, a sodium battery, a lead-acid battery, etc., and the core pack 100 is used to store and release electricity. There can be multiple core packs 100, and multiple core packs 100 can be electrically connected in series or in parallel or in series and parallel. The core pack 100 is arranged inside the battery housing 200, and the battery housing 200 provides protection for the core pack 100 to prevent the core pack 100 from being damaged by unstable external forces.

[0036] Please continue reading Figure 3 and Figure 4 , Figure 3 2 is a schematic diagram of the exploded structure of the battery housing 200 provided in an embodiment of the utility model. Figure 4 yes Figure 3Schematic diagram of the three-dimensional structure of the main shell 10 in the battery housing 200. The battery housing 200 includes a main shell 10 and a cover 20. The main shell 10 is provided with a receiving cavity 210 for receiving the core package 100 and an opening 121 communicating with the receiving cavity 210, and the side wall of the main shell 10 is provided with a protrusion 122 extending toward the receiving cavity 210. The cover 20 is welded to the main shell 10 and covers the opening 121 of the receiving cavity 210. The cover 20 is inserted into the receiving cavity 210 along the opening 121 and at least partially abuts against the protrusion 122 to position the main shell 10 and the cover 20. By providing the protrusion 122 on the main shell 10 and using the protrusion 122 to abut against the cover 20 for limiting, the welding connection of the main shell 10 and the cover 20 can be facilitated, and since the main shell 10 and the cover 20 do not have flange edges, the length and width of the main shell 10 and the cover 20 are reduced, and the energy density of the single battery 00 is improved.

[0037] Furthermore, if Figures 4 to 7 As shown, Figure 5 yes Figure 3 The three-dimensional structural diagram of the cover body 20 and the enlarged structural diagram of the circle A are shown in FIG. Figure 6 yes Figure 1 A schematic cross-sectional view of a single cell 00 in FIG. Figure 7 yes Figure 6 The main shell 10 includes a main bottom wall 125 and a plurality of main side walls 124. The plurality of main side walls 124 and the main bottom wall 125 are connected to form a receiving cavity 210. The plurality of main side walls 124 are connected to form an opening 121. The protrusions 122 are provided on the plurality of main side walls 124. The cover body 20 includes a cover top wall 21 and a plurality of cover side walls 22. The plurality of cover side walls 22 are connected to the edges of the cover top wall 21. The protrusions 122 abut against the side of the cover side wall 22 away from the cover top wall 21.

[0038] Specifically, in this embodiment, the main bottom wall 125 is arranged in a rectangular shape, the number of main side walls 124 is four, the four main side walls 124 are respectively arranged on the four sides of the main bottom wall 125, and the protrusions 122 are arranged on the plurality of main side walls 124. The cover top wall 21 is arranged in a rectangular shape, the number of cover side walls 22 is four, the four cover side walls 22 are respectively arranged on the four sides of the cover top wall 21 and connected to the cover top wall 21. When the cover body 20 is covered on the main shell 10, the end of the cover side wall 22 away from the cover top wall 21 abuts against the protrusion 122 on the main side wall 124. By arranging a plurality of protrusions 122 on the main side wall 124, it is convenient to arrange the cover side wall 22 of a shorter length, thereby facilitating the processing and forming of the cover body 20.

[0039] like Figure 6 and Figure 7As shown, in this embodiment, the cover side wall 22 is located in the accommodating cavity 210, and the outer side surface of the cover side wall 22 abuts against the inner side surface of the main side wall 124 to reduce the gap between the cover body 20 and the main shell 10. The protrusion 122 is provided on the inner side surface of the main side wall 124 to abut against the bottom of the cover side wall 22.

[0040] Furthermore, a plurality of protrusions 122 may be provided, and the plurality of protrusions 122 are arranged on the main side wall 124 at intervals, and the plurality of protrusions 122 are at the same height from the main bottom wall 125 .

[0041] Specifically, in this embodiment, a plurality of spaced protrusions 122 are provided in the height direction of the main side wall 124, and the distances between the plurality of protrusions 122 and the main bottom wall 125 are equal, that is, the plurality of protrusions 122 are located in a horizontal plane parallel to the main bottom wall 125, so that the heights of the plurality of cover side walls 22 of the cover body 20 can be set to be the same, which is not only convenient for the processing and manufacturing of the cover body 20, but also does not require special alignment operations when the cover body 20 is assembled, so that when the cover body 20 is covered on the opening 121 of the main shell 10, the plurality of protrusions 122 can simultaneously abut against the cover body 20, thereby positioning and limiting the cover body 20 in the height direction. By providing a plurality of spaced protrusions 122, the limiting effect of the protrusions 122 on the cover body 20 can be enhanced, thereby achieving a better positioning effect of the cover body 20.

[0042] Optionally, the cross section of the protrusion 122 may be selected from at least one of an elongated shape and a circular shape.

[0043] The cross section of the protrusion 122 refers to the cross section of the protrusion 122 on the surface parallel to the plane where the main side wall 124 is located. In some embodiments, the cross section of the protrusion 122 can be set to be a long strip, and the length direction of the long strip protrusion 122 is parallel to the plane direction where the main bottom wall 125 is located. By setting the long strip protrusion 122, the abutting force of the protrusion 122 on the cover body 20 can be increased.

[0044] Alternatively, in some embodiments, the cross-section of the protrusion 122 can be set to be completely circular. By setting the protrusion 122 to be circular, it is possible to avoid excessive interference of the protrusion 122 on the cover body 20 and reduce the processing accuracy of the cover body 20 and the protrusion 122.

[0045] In this embodiment, the cross-sections of the plurality of protrusions 122 may include both elongated and circular shapes, that is, the cross-sections of some protrusions 122 may be set to be circular, and the cross-sections of some protrusions 122 may be set to be elongated. In this way, not only the abutting force of the protrusions 122 on the cover body 20 can be ensured, but also excessive interference of the protrusions 122 on the cover body 20 can be avoided, thereby reducing the processing accuracy of the cover body 20 and the protrusions 122.

[0046] Furthermore, when the main bottom wall 125 is arranged in a polygonal shape, the plurality of protrusions 122 can be arranged near the top corners of the main shell 10. The position near the top corners of the main shell 10 specifically refers to other positions except the central axis position of the main side wall 124 in the length direction.

[0047] Specifically, if Figure 4 , Figure 8 and Fig. 9 As shown, in this embodiment, the main bottom wall 125 is arranged in a rectangular shape, the main shell 10 has four top corners, and the protrusions 122 are arranged at positions adjacent to the top corners, that is, at opposite ends of the length direction of each main side wall 124, so as to facilitate the positioning of the top corners of the cover body 20, thereby improving the stability of the cover body 20 and preventing the top corners of the cover body 20 from warping up.

[0048] Alternatively, in other optional embodiments, when the main bottom wall 125 is set to other polygonal shapes as needed, the plurality of protrusions 122 may also be set at positions adjacent to the top corners.

[0049] Furthermore, when the protrusions 122 include at least two protrusions 122 with different cross-sectional shapes, the cross-sectional shapes of the protrusions 122 arranged near the same vertex can be made the same, so that two adjacent cover side walls 22 of the cover body 20 are subjected to uniform force.

[0050] Specifically, if Figure 4 , Figure 8 and Fig. 9 As shown, Figure 8 yes Figure 4 Schematic diagram of the enlarged structure of the C region in the figure. Fig. 9 yes Figure 4 The plurality of protrusions 122 may include a first protrusion 122a and a second protrusion 122b having different cross-sectional shapes, and each main side wall 124 is provided with a first protrusion 122a and a second protrusion 122b.

[0051] In this embodiment, the cross-sectional shape of the first protrusion 122a is a long strip, the length direction of the first protrusion 122a is parallel to the plane direction of the main bottom wall 125, and the cross-sectional shape of the second protrusion 122b is a circle, that is, the first protrusion 122a is a strip-shaped rib, and the second protrusion 122b is a circular convex point. The number of protrusions 122 arranged on each main side wall 124 is three, and specifically can include two spaced second protrusions 122b and one strip-shaped first protrusion 122a, and the two second protrusions 122b are spaced along the length direction of the first protrusion 122a, that is, the two second protrusions 122b and one first protrusion 122a are at an equal distance from the main bottom wall 125 to jointly define a horizontal plane.

[0052] Optionally, in some other embodiments, the cross-section of the protrusion 122 may also be set to a square, triangle, trapezoid or other shape, which is not specifically limited here and can be flexibly selected according to processing requirements.

[0053] Furthermore, the main shell 10 can be set as an integral stamping structure, and the cover body 20 can be set as an integral stamping structure. By stamping the integral main shell 10 and the integral cover body 20, the processing technology of the main shell 10 and the cover body 20 can be simplified, the processing efficiency can be improved, and then the production time can be saved and the processing cost can be reduced.

[0054] Optionally, the protrusions 122 can be integrally formed with the main shell 10, that is, the plurality of protrusions 122 can be formed by stamping the main side wall 124 of the main shell 10, thereby forming an inseparable integral structure, so as to simplify the processing technology of the protrusions 122 and improve the processing efficiency. Alternatively, the plurality of protrusions 122 can also be connected to the main shell 10 by bonding or welding, which is not specifically limited here.

[0055] Furthermore, if Figure 4 As shown, a pole hole 123 is provided on the main side wall 124 of the main housing 10, and the pole hole 123 is used to assemble the pole 30, and the opening 121 and the pole hole 123 are respectively provided on two adjacent sides of the main housing 10. The pole 30 is inserted into the pole hole 123, and the part of the pole 30 located in the accommodating cavity 210 is connected to the core package 100, and the part of the pole 30 located outside the accommodating cavity 210 is used to connect with the electrical components on the electronic device, that is, the pole 30 is used to electrically connect the core package 100 and the electrical components.

[0056] At present, in the assembly process of a single battery, the pole is first assembled to the cover, then the core package is welded to the pole, and finally the cover assembled with the pole and the core package is placed on the opening of the main shell and welded to the main shell, at which time the core package is placed in the accommodating cavity. Since the thickness of the cover is small and the weight of the assembled core package is large, the cover is easily deformed after the core package is assembled, which is not only not conducive to the welding of the cover and the main shell, but also inconvenient to store the cover assembled with the pole and the core package.

[0057] In this embodiment, the opening 121 and the pole hole 123 are respectively arranged on the adjacent two sides of the main shell 10. When assembling the single battery 00, the pole 30 is first assembled on the pole hole 123 of the main shell 10, and then the core pack 100 is placed in the accommodating cavity 210, and the core pack 100 is welded to the pole 30. Finally, the cover body 20 is covered on the opening 121 of the main shell 10 and welded to the main shell 10. In this way, the difficulty of assembling the single battery 00 can be simplified. Furthermore, since no heavy objects are attached to the cover body 20, the storage and transportation of the cover body 20 can be made more convenient, and deformation of the cover body 20 can be avoided to affect the welding connection with the main shell 10.

[0058] Furthermore, in this embodiment, the main shell 10 has a horizontal direction and a height direction that are perpendicular to each other. The main shell 10 is provided with an opening 121 in the height direction that communicates with the accommodating cavity 210 , and the main shell 10 is provided with a pole hole 123 in the horizontal direction.

[0059] Specifically, if Figure 4 As shown, the horizontal direction of the main housing 10 is the horizontal plane direction formed by the X and Y axes, and the height direction of the main housing 10 is the Z axis direction perpendicular to the horizontal plane direction formed by the X and Y axes. The height of the main housing 10 in the height direction is D, and the length of the main housing 10 in the horizontal direction is H. D can be set <H。

[0060] The horizontal length H of the main shell 10 refers to the smaller of the length of the main shell 10 along the X-axis direction and the length of the main shell 10 along the Y-axis direction. By setting the height dimension of the main shell 10 smaller than the horizontal dimension, it is convenient to place the core package 100 into the accommodating cavity 210 through the opening 121, and it is convenient to form the main shell 10.

[0061] Furthermore, 5≤H / D≤10 can be set. By setting the ratio of the length of the main shell 10 along the horizontal direction to the height of the main shell 10 along the Z-axis direction to be greater than or equal to 5 and less than or equal to 10, the main shell 10 can have a more suitable height and length, so that the main shell 10 can be integrally formed by stamping, and the assembly of the cover body 20 can be facilitated.

[0062] Among them, the ratio of the length of the main shell 10 along the X-axis direction or the length of the main shell 10 along the Y-axis direction to the height of the main shell 10 along the Z-axis direction can be set to 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, for example, and the specific ratio can be selected according to the specifications of the single cell.

[0063] Compared with the prior art, the embodiment of the utility model provides a protrusion 122 on the main shell 10, and uses the protrusion 122 to abut the cover body 20 for limiting, which can facilitate the welding of the main shell 10 and the cover body 20. In addition, since the main shell 10 and the cover body 20 do not have flange edges, the length and width dimensions of the battery shell 200 are reduced, and the energy density of the single cell 00 is improved. This also makes it easier to form the main shell 10 and the cover body 20, and can improve the working stability of the single cell 00.

[0064] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A battery housing, characterized in that: include: A main shell, comprising a receiving cavity for receiving the core package and an opening communicating with the receiving cavity, and a side wall of the main shell is provided with a protrusion extending toward the receiving cavity; and A cover body is connected to the main shell and covers the opening of the accommodating cavity. The cover body is inserted into the accommodating cavity along the opening and at least partially abuts against the protrusion to position the main shell and the cover body.

2. The battery housing according to claim 1, characterized in that: The main shell includes a main bottom wall and a plurality of main side walls, the plurality of main side walls and the main bottom wall are connected and jointly surrounded to form the accommodating cavity, the plurality of main side walls are surrounded to form the opening, and the protrusions are arranged on the plurality of main side walls; The cover body comprises a cover top wall and a plurality of cover side walls, the edges of the plurality of cover side walls and the cover top wall are connected, and the protrusion abuts against a side of the cover side wall away from the cover top wall.

3. The battery housing according to claim 2, characterized in that: There are a plurality of protrusions, and the plurality of protrusions are arranged at intervals on the main side wall, and the heights of the plurality of protrusions from the main bottom wall are equal.

4. The battery housing according to claim 2, characterized in that: The main bottom wall is arranged in a polygonal shape, and there are multiple protrusions, and multiple protrusions are arranged near the top corners of the main shell.

5. The battery casing according to claim 4, characterized in that: The protrusions include at least two types of protrusions having different cross-sectional shapes, and the cross-sectional shapes of the protrusions arranged adjacent to the same vertex are the same.

6. The battery housing according to any one of claims 1 to 5, characterized in that: The protrusions include a first protrusion and a second protrusion having different cross-sectional shapes, and each of the main side walls is provided with the first protrusion and the second protrusion.

7. The battery casing according to claim 6, characterized in that: The cross-section of the first protrusion is in the shape of an elongated strip, the length direction of the first protrusion is parallel to the plane direction of the main bottom wall, the cross-section of the second protrusion is in the shape of a circle, and there are two second protrusions arranged on the same main side wall, and the two second protrusions are arranged at intervals along the length direction of the first protrusion.

8. The battery casing according to claim 1, characterized in that: The main shell is provided with a pole hole, and the pole hole is used to assemble the pole. The opening and the pole hole are respectively arranged on two adjacent sides of the main shell.

9. The battery casing according to claim 8, characterized in that: The main shell has a horizontal direction and a height direction perpendicular to each other. The main shell is provided with the opening in the height direction. The main shell is provided with the pole hole in the horizontal direction. The height of the main shell in the height direction is D. The length of the main shell in the horizontal direction is H. D <H。 10. A single cell battery, characterized in that: The single battery comprises: a core pack and a battery case according to any one of claims 1 to 9, wherein the core pack is disposed in the accommodation cavity of the battery case.

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