Battery shell and battery

Abstract

The utility model relates to the technical field of batteries, particularly provides a battery shell and a battery, and aims to solve the problems that the binding force between the conventional battery shell and a plastic frame is poor and the sealing effect is poor during injection molding. In order to achieve the purpose, the battery shell comprises a bottom wall, a side wall arranged around the bottom wall and a connecting part arranged on the side wall, a plurality of first grooves arranged around the side wall at intervals are formed in the connecting part, and the included angle a between each first groove and the outer end face of the connecting part is set to be 0-90 degrees. According to the invention, the plurality of first grooves which are arranged at intervals are formed in the connecting part, so that the contact area and the contact depth of the plastic frame and the connecting part are increased, the binding force and the sealing effect of the plastic frame and the connecting part are improved, and the extension direction of the first grooves is arranged to be intersected with but not perpendicular to the outer end surface of the connecting part; therefore, the binding force and the sealing effect of the plastic frame and the connecting part are further improved.

Description

Technical Field

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

[0002] New energy vehicles have attracted more and more attention due to their low noise, no pollution, high energy efficiency and other characteristics, thus promoting the accelerated development of new energy vehicles. At present, new energy vehicles usually use batteries as a power source, which provides a broad space for the application and development of lithium-ion batteries.

[0003] The battery shell is mostly sealed by laser welding, but laser welding generally has the problem of low welding yield, resulting in poor sealing of the battery shell.

[0004] In order to improve the connection strength and sealing effect of the battery case, the connection and sealing of the battery case can be achieved by wrapping the flange of the battery case with molten plastic to form a circle of sealed plastic frame. However, since the flange is usually a smooth plane, the bonding force between the plastic frame formed by injection molding on the flange and the flange is poor and the sealing effect is not ideal, resulting in poor structural strength and poor sealing effect of the battery case.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the above technical problem, that is, to solve the problem that the connection strength between the existing battery housing and the plastic frame is poor and the sealing effect is not good when the battery housing is injection molded.

[0007] In a first aspect, the utility model provides a battery housing, comprising a bottom wall, a side wall arranged around the bottom wall, and a connecting portion arranged on the side wall, wherein the connecting portion is provided with a plurality of first grooves, the plurality of first grooves are arranged at intervals around the circumference of the side wall, and the angle between the first groove and the outer end surface of the connecting portion is a, wherein 0°<a<90°.

[0008] In the case of adopting the above technical solution, the battery shell of the utility model is provided with a plurality of first grooves arranged at intervals on the connecting part. When the battery shell is injection-molded, the molten plastic will penetrate into the first grooves, thereby increasing the contact area and contact depth between the plastic frame and the connecting part, thereby improving the bonding force and sealing effect between the plastic frame and the connecting part. By setting the extension direction of the first groove to intersect with the outer end face of the connecting part but not perpendicular to it, the bonding force between the plastic frame and the connecting part is further improved, thereby improving the sealing effect of the battery shell.

[0009] In the preferred technical solution of the above battery housing, the angle between the first groove and the outer end surface of the connecting portion ranges from 40° to 50°.

[0010] In the case of adopting the above technical solution, the utility model limits the angle between the first groove and the outer end face of the connecting part to between 40° and 50°, so that more first grooves can be provided within the same area, thereby increasing the number of first grooves, so that more molten plastic can penetrate into the first grooves, thereby further improving the bonding strength and sealing effect between the plastic frame and the connecting part.

[0011] In a preferred technical solution of the above battery housing, a plurality of the first grooves on the side wall located on the same side are arranged in parallel.

[0012] When the above technical solution is adopted, the utility model arranges multiple first grooves on the connecting part on the same side of the side wall in parallel with each other, so that the distribution of the first grooves on the connecting part is more regular and uniform, thereby improving the grooving efficiency and grooving rate.

[0013] In a preferred technical solution of the above battery housing, the first grooves located on both sides of the side wall in the first direction intersect with the first grooves located on both sides of the side wall in the second direction.

[0014] When the above technical solution is adopted, the utility model can further improve the bonding strength and sealing effect between the plastic frame and the connecting part by intersecting the extension lines of the first grooves located on both sides of the side wall in the first direction with the extension lines of the first grooves located on both sides of the side wall in the second direction.

[0015] In a preferred technical solution of the above battery housing, the connecting portion further comprises a plurality of second grooves arranged at intervals in the circumferential direction around the side wall, and the second grooves intersect with the first grooves.

[0016] When adopting the above technical solution, the utility model greatly increases the number of grooves by setting a second groove intersecting with the first groove on the connecting part, so that the molten plastic can penetrate into the groove more, thereby further improving the bonding strength and sealing effect between the plastic frame and the connecting part.

[0017] In a preferred technical solution of the above battery housing, the direction of the first groove is perpendicular to the direction of the second groove.

[0018] When the above technical solution is adopted, the utility model arranges the second groove perpendicularly to the first groove, so that the distribution of the first groove and the second groove is more regular and uniform, thereby improving the grooving efficiency and the grooving rate.

[0019] In a preferred technical solution of the above battery casing, the depth of the first groove is any value between 10 micrometers and 290 micrometers; and / or the width of the first groove is any value between 20 micrometers and 200 micrometers.

[0020] In the case of adopting the above technical solution, the utility model can limit the depth of the first groove, thereby avoiding the influence of the bonding force between the plastic frame and the connecting part due to the depth of the first groove being too shallow, and avoiding the influence of the structural strength of the connecting part due to the depth of the first groove being too deep. By limiting the width of the first groove, it can avoid the reduction of the number of the first grooves due to the width of the first groove being too wide, thereby affecting the bonding force between the plastic frame and the connecting part, and can also avoid the grooving efficiency and grooving rate due to the width of the first groove being too narrow.

[0021] In the preferred technical solution of the above battery housing, the width of the first groove area is a first width, and the width of the connecting portion is a second width, wherein the ratio of the first width to the second width is any value from 40% to 100%.

[0022] When the above technical solution is adopted, the utility model limits the ratio of the area width of the first groove to the width of the connecting portion, thereby preventing the area width of the first groove from being too small, affecting the bonding force between the plastic frame and the battery shell, thereby causing the plastic frame and the battery shell to fall off.

[0023] In a second aspect, the utility model also provides a battery, comprising a first battery shell, a second battery shell and a plastic frame, wherein the first battery shell and / or the second battery shell is the battery shell described in any one of the above items, and the plastic frame covers the outer end surface of the connecting part of the first battery shell and the second battery shell, and part of the plastic frame is accommodated in the first groove.

[0024] When the above technical solution is adopted, the utility model can set the first groove on the connecting part of the first battery shell or the second battery shell alone, or set the first groove on the connecting part of the first battery shell and the second battery shell at the same time, which gives users more choices. By accommodating the plastic frame part in the first groove, the bonding force between the plastic frame and the battery shell is improved.

[0025] In a preferred technical solution of the above-mentioned battery, the battery also includes a partition arranged between the first battery shell and the second battery shell, wherein a gap is provided between the connecting portion of the first battery shell and the partition and / or between the connecting portion of the second battery shell and the partition, and part of the plastic frame is accommodated in the gap; and / or, the connecting portion of the first battery shell and / or the connecting portion of the second battery shell is provided with a through hole, and part of the plastic frame is accommodated in the through hole.

[0026] When the above technical solution is adopted, the utility model can set a gap between the connecting part of the first battery shell and the edge of the partition or between the connecting part of the second battery shell and the edge of the partition, and can also set a gap between the connecting part of the first battery shell and the edge of the partition and between the connecting part of the second battery shell and the edge of the partition at the same time, giving users more choices. By setting a through hole on the connecting part of the first battery shell or the connecting part of the second battery shell, or setting a through hole on the connecting part of the first battery shell and the connecting part of the second battery shell at the same time, the user is given more choices and the bonding strength between the plastic frame and the battery shell is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic diagram of an explosion of a battery of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a battery of the utility model;

[0030] Figure 3 yes Figure 2 A cross-sectional view of the first embodiment at AA;

[0031] Figure 4 yes Figure 2 A cross-sectional view of the second embodiment at AA;

[0032] Figure 5 It is a structural schematic diagram of a first embodiment of a battery housing of the utility model;

[0033] Figure 6 It is a structural schematic diagram of a second embodiment of a battery housing of the utility model;

[0034] Figure 7 yes Figure 6 Sectional view at the middle BB;

[0035] Figure 8 It is a structural schematic diagram of the connecting portion of the battery housing of the present utility model.

[0036] List of reference numerals:

[0037] 1. Battery housing; 11. First battery housing; 12. Second battery housing; 13. Partition; 14. Connecting portion; 15. First groove; 16. Second groove; 17. Through hole; 18. Bottom wall; 19. Side wall; 10. Gap; 141. First connecting portion; 142. Second connecting portion; 143. External end surface.

[0038] 2. Plastic frame. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0040] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Based on the problem that the existing battery housing has poor structural stability and poor sealing effect as pointed out in the background technology, the utility model provides a battery housing and a battery, which aims to provide a plurality of first grooves arranged at intervals on the connecting part, so that when the battery housing is injection-molded and sealed, the molten plastic will penetrate into the first grooves, increasing the contact area and contact depth between the plastic frame and the connecting part, thereby improving the bonding force and sealing effect between the plastic frame and the connecting part, and by setting the extension direction of the first groove to intersect with the outer end face of the connecting part but not perpendicular, the bonding force between the plastic frame and the connecting part is further improved, thereby improving the sealing effect of the battery housing. The above-mentioned connecting part is the flange of the battery housing.

[0043] Specifically, the utility model provides a battery, which includes a battery housing 1 , a battery cell installed in the battery housing, and a plastic frame 2 used for connecting and sealing the battery housing 1 .

[0044] See first Figures 1 to 8 , a detailed description of this application is given.

[0045] like Figures 1 to 4As shown, the battery housing 1 of the present invention includes a bottom wall 18 and a side wall 19 arranged around the bottom wall 18, and a connecting portion 14 is provided on the side wall 19. The connecting portion 14 is arranged along the circumference of the side wall 19 and extends in a direction away from the battery housing. The plastic frame 2 is covered on the connecting portion 14 to seal the first battery housing 11 and the second battery housing 12. The battery housing 1 is made of metal, preferably an aluminum shell.

[0046] That is to say, the utility model uses a plastic frame 2 to seal and connect the battery shell 1. Compared with the prior art that uses laser welding to seal and connect the battery shell 1, the battery shell 1 is sealed and connected by injection molding. The plastic frame 2 has a strong bonding force with the battery shell 1, good sealing and high yield. Moreover, large quantities can be injection molded and sealed at the same time, which is efficient and low cost. In addition, the connection between the plastic frame 2 and the battery shell 1 can be non-destructively disassembled by physical methods (such as heating, etc.), which is convenient for recycling and reuse of the battery shell 1.

[0047] For example, Figures 1 to 4 As shown, the connecting portion 14 is arranged along the circumference of the side wall 19 of the battery housing 1 and extends in a direction away from the battery housing 1. The plastic frame 2 is also arranged along the circumference of the battery housing 1. The plastic frame 2 is made of plastic. During the processing, the assembled battery is first placed in the injection mold, and then the molten plastic is injected into the injection mold. After the plastic is cooled, a circle of plastic frame 2 is formed along the circumference of the battery housing 1.

[0048] Preferably, if Figures 2 to 7 As shown, the connection portion 14 is provided with a plurality of first grooves 15 for accommodating injection molding materials (such as plastic) on the surface connected to the plastic frame 2. The plurality of first grooves 15 are arranged at intervals along the circumference of the connection portion 14, i.e., around the circumference of the side wall 19. The angle between the first grooves 15 and the outer end surface 143 of the connection portion 14 is a, wherein 0°<a<90°.

[0049] By providing a plurality of first grooves 15 arranged at intervals on the surface of the connecting portion 14, during the injection molding process, the molten plastic will penetrate into the first grooves 15, thereby improving the bonding strength and sealing effect of the connecting portion 14 of the plastic frame 2 and the battery shell 1. By setting the angle a between the first groove 15 and the outer end surface 143 of the connecting portion 14 to be between 0° and 90°, the extension direction of the first groove 15 is neither parallel nor perpendicular to the outer end surface 143 of the connecting portion 14, thereby further improving the bonding strength and sealing effect of the connecting portion 14 of the plastic frame 2 and the battery shell 1.

[0050] Preferably, if Figures 1 to 8As shown, the battery 1 of the utility model includes a first battery shell 11 and a second battery shell 12 arranged in the thickness direction, the connecting portion 14 includes a first connecting portion 141 arranged on the first battery shell 11 and a second connecting portion 142 arranged on the second battery shell 12, the first connecting portion 141 is provided with a first groove 15 on the surface in contact with the plastic frame 2, and the second connecting portion 142 is also provided with a first groove 15 on the surface in contact with the plastic frame 2.

[0051] For example, Figures 1 to 4 As shown, the first connection part 141 and the second connection part 142 are respectively arranged in a circle along the circumference of the first battery shell 11 and the circumference of the second battery shell 12, the upper surface of the first connection part 141 is provided with a first groove 15, and the lower surface of the second connection part 142 is provided with a first groove 15, the plastic frame 2 completely covers the first connection part 141 and the second connection part 142, and the plastic frame 2 penetrates into the first groove 15, thereby sealing the first connection part 141 and the second connection part 142.

[0052] It should be noted that, in actual application, those skilled in the art may only provide the first groove 15 on the first connection portion 141, or only provide the first groove 15 on the second connection portion 142. Such flexible adjustment and change do not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model. Of course, the battery housing 1 of the present utility model preferably provides the first groove 15 on both the first connection portion 141 and the second connection portion 142.

[0053] Preferably, if Figures 1 to 7 As shown, the battery 1 of the present invention further includes a partition 13 disposed between the first battery housing 11 and the second battery housing 12 , and an edge of the partition 13 is located between the first connecting portion 141 of the first battery housing 11 and the second connecting portion 142 of the second battery housing 12 .

[0054] Preferably, if Figure 3 As shown, in a preferred embodiment of the battery housing 1 , the first connecting portion 141 of the first battery housing 11 and the upper surface of the edge of the partition 13 and the second connecting portion 142 of the second battery housing 12 and the lower surface of the partition 13 are tightly fitted together.

[0055] Preferably, if Figure 4 As shown, in another preferred embodiment of the battery housing 1, a gap 10 is provided between the first connecting portion 141 of the first battery housing 11 and the edge of the partition 13, and between the second connecting portion 142 of the second battery housing 12 and the edge of the partition 13, and a portion of the plastic frame 2 is injected and accommodated in the gap 10.

[0056] Of course, in the present invention, preferably, a gap 10 is provided between the first connecting portion 141 of the first battery shell 11 and the edge of the partition 13, and between the second connecting portion 142 of the second battery shell 12 and the edge of the partition 13, and the plastic frame 2 is partially injected and accommodated in the gap 10, thereby increasing the bonding force and sealing effect between the battery shell 1 and the plastic frame 2.

[0057] For example, Figures 1 to 4 As shown, the first battery shell 11, the partition 13 and the second battery shell 12 are stacked together in a sandwich manner, the edge of the partition 13 is located between the first connecting portion 141 and the second connecting portion 142, and the portions of the first connecting portion 141 and the second connecting portion 142 away from the side walls of the first battery shell 11 and the second battery shell 12 extend in a direction away from the partition 13, so that a gap 10 appears between the first connecting portion 141 and the second connecting portion 142 and the edge of the partition 13, a first groove 15 is provided on the lower surface of the first connecting portion 141, and a first groove 15 is also provided on the upper surface of the second connecting portion 142, and the plastic frame 2 fills the gap 10 and penetrates into the first groove 15.

[0058] It should be noted that the present invention does not limit the setting position of the first groove 15. For example, technicians in this field can also set the first groove 15 on the upper surface and the lower surface of the edge of the partition 15 at the same time. In this way, the number of first grooves 15 can be increased, so that the plastic frame 2 can penetrate into the first grooves 15 more, and the bonding force and sealing effect between the plastic frame 2 and the connecting part 14 are further improved.

[0059] In addition, it should be noted that the battery 1 of the present invention is not limited to the above-mentioned "first battery shell 11+partition 13+second battery shell 12" structure. For example, the battery 1 can also be set to a traditional "shell body+cover" or "upper shell+lower shell" structure. Of course, the present invention preferably sets the battery 1 to the above-mentioned "first battery shell 11+partition 13+second battery shell 12" structure, a chamber that can accommodate battery cells is formed between the first battery shell 11 and the partition 13, and a chamber that can accommodate battery cells is also formed between the second battery shell 12 and the partition 13. In this way, the battery 1 can accommodate two battery cells at the same time.

[0060] Preferably, if Figure 5 and 6 As shown, the included angle a between the first groove 15 and the outer end surface 143 of the connecting portion 14 is in the range of 40° to 50°.

[0061] By further limiting the range of the angle between the first groove 15 and the outer end surface 143 of the connecting portion 14, more first grooves 15 can be provided within the same area, thereby increasing the number of the first grooves 15, so that the molten plastic can penetrate more into the first grooves 15, thereby further improving the bonding strength and sealing effect between the plastic frame 2 and the connecting portion 14.

[0062] Preferably, if Figure 5 As shown, the plurality of first grooves 15 on the connecting portion 14 on the same side of the side wall 19 of the battery housing 1 are parallel to each other.

[0063] For example, Figure 5 As shown, the battery case 1 is a rectangular structure, and the battery case 1 has two long sides and two short sides. Accordingly, the first connecting portion 141 and the second connecting portion 142 are each composed of two long side connecting portions and two short side connecting portions. Each long side connecting portion is provided with a plurality of first grooves 15, and the plurality of first grooves 15 are distributed in parallel along the length direction of the long side connecting portion (i.e., the length direction of the battery case 1). Each short side connecting portion is provided with a plurality of first grooves 15, and the plurality of first grooves 15 are distributed in parallel along the length direction of the short side connecting portion (i.e., the width direction of the battery case 1).

[0064] It should be noted that those skilled in the art may arrange all the first grooves 15 on the first connecting portion 141 and the second connecting portion 142 in parallel, or arrange the extension directions of the first grooves 15 on the long side connecting portion and the first grooves 15 on the short side connecting portion to intersect, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0065] In the first preferred case, if Figure 5 As shown, the extension lines of the first grooves 15 on both sides of the side walls 19 of the battery housing 1 in the first direction intersect with the extension lines of the first grooves 15 on both sides of the side walls 19 of the battery housing 1 in the second direction, and the first direction is perpendicular to the second direction.

[0066] It should be noted that the first direction is Figure 2 , 5 , 6, the left and right direction is the length direction of the battery housing 1, and the second direction is Figure 2 , 5 The up-down direction in 6 is the width direction of the battery case 1 .

[0067] For example, Figure 5As shown, the multiple first grooves 15 located on the long side connecting portion are distributed in parallel and spaced apart along the length direction of the long side connecting portion, the spacing between two adjacent parallel first grooves 15 is the same, and the first grooves 15 respectively arranged on the two long side connecting portions have the same angle with the length direction of the long side connecting portion; the multiple first grooves 15 located on the short side connecting portion are distributed in parallel and spaced apart along the length direction of the short side connecting portion, the spacing between two adjacent parallel first grooves 15 is the same, and the first grooves 15 respectively arranged on the two short side connecting portions have the same angle with the length direction of the short side connecting portion, and the first grooves 15 arranged on the long side connecting portion intersect with the extension direction of the first grooves 15 arranged on the short side connecting portion.

[0068] It should be noted that, in actual applications, those skilled in the art may also set different angles between the first grooves 15 respectively provided on the two long side connecting parts and the length direction of the long side connecting parts, and set different angles between the first grooves 15 respectively provided on the two short side connecting parts and the length direction of the short side connecting parts. Such flexible adjustments and changes do not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0069] Of course, the utility model preferably sets the angles between the first grooves 15 respectively provided on the two long side connecting parts and the length direction of the short side connecting parts to be the same, and sets the angles between the first grooves 15 respectively provided on the two short side connecting parts and the length direction of the short side connecting parts to be the same, so as to facilitate grooving and improve grooving efficiency.

[0070] In the second preferred case, if Figure 6 As shown, the battery housing 1 further includes a plurality of second grooves 16 arranged at intervals along the circumference of the connecting portion 14 , and the second grooves 16 intersect with the first grooves 15 .

[0071] For example, Figure 6 As shown, the extension directions of the plurality of second grooves 16 on the two long side connecting portions and the two short side connecting portions are the same, that is, the plurality of second grooves 16 are distributed in parallel on the connecting portion 14, and the spacings between two adjacent parallel second grooves 16 are the same, the plurality of first grooves 15 are distributed in parallel and spaced apart along the length direction of the connecting portion 14 on the connecting portion 14, the plurality of second grooves 16 are distributed in parallel and spaced apart along the length direction of the connecting portion 14 on the connecting portion 14, the direction in which the first grooves 15 extend on the connecting portion 14 is different from the direction in which the second grooves 16 extend on the connecting portion 14, that is, the first grooves 15 and the second grooves 16 are cross-arranged on the connecting portion 14.

[0072] That is to say, the distribution states of the first grooves 15 and the second grooves 16 on the connecting portion 14 are completely the same, but the extension directions are different.

[0073] It should be noted that the present invention does not limit the intersection angle of the first groove 15 and the second groove 16 on the connecting portion 14. For example, those skilled in the art can set the intersection angle of the first groove 15 and the second groove 16 on the connecting portion 14 to any value between 0° and 90°, as long as the angle a between the extension direction of the first groove 15 and the second groove 16 and the outer end surface 143 of the connecting portion 14 is between 0° and <90. Such adjustment and change of the specific intersection angle of the first groove 15 and the second groove 16 on the connecting portion 14 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0074] Preferably, if Figure 6 As shown, the first groove 15 and the second groove 16 are arranged perpendicularly.

[0075] That is, the first groove 15 and the second groove 16 are arranged vertically and crosswise on the connecting portion 14, so that the distribution of the first groove 15 and the second groove 16 is more regular and uniform, thereby improving the grooving efficiency and the grooving rate.

[0076] Preferably, if Figure 8 As shown, the depth h of the first groove 15 is any value between 10 μm and 290 μm.

[0077] For example, those skilled in the art may set the depth h of the first groove 15 to 10 micrometers, 50 micrometers, 100 micrometers, 150 micrometers, 200 micrometers, 250 micrometers or 290 micrometers in practical applications.

[0078] It should be pointed out that the depth of the first groove 15 refers to the dimension of the first groove 15 along the thickness direction of the connecting portion 14. By limiting the depth h of the first groove 15, it is possible to avoid affecting the bonding force between the plastic frame 2 and the battery housing 1 due to the depth h of the first groove 15 being too shallow, and to avoid affecting the structural strength of the connecting portion 14 due to the depth h of the first groove 15 being too deep. The depth of the first groove 15 is further preferably any value between 50 microns and 150 microns.

[0079] Preferably, if Figure 8 As shown, the width w of the first groove 15 is preferably any value between 20 μm and 200 μm.

[0080] For example, the width w of the first groove 15 can be set to 20 micrometers, 50 micrometers, 80 micrometers, 100 micrometers, 120 micrometers, 150 micrometers, 180 micrometers or 200 micrometers, wherein the width w of the first groove 15 is further preferably set to any value between 50 micrometers and 120 micrometers.

[0081] It should be noted that, in the case where a plurality of first grooves 15 are provided, it is preferred that the widths w of the plurality of first grooves 15 are set to be the same.

[0082] Preferably, if Figure 3 As shown, the width of the area on the surface of the connecting portion 14 where the first groove 15 is provided is a first width L0, and the width of the connecting portion 14 is a second width L, wherein a ratio δ of L0 to L is any value from 40% to 100%.

[0083] That is to say, the width L0 of the area where the first groove 15 is arranged on the surface of the connecting portion 14 is at least 40% of the width of the surface. This arrangement can prevent the plastic frame 2 from falling off during use of the battery, thereby improving the safety and reliability of the battery.

[0084] For example, the ratio δ may be set to 40%, 50%, 60%, 70%, 80%, 90%, or 100%.

[0085] Of course, the utility model preferably sets the ratio δ to 100%, that is, the entire surface of the connecting portion 14 is the setting area of ​​the first groove 15. Through such a setting, the area of ​​the first groove 15 can be increased, and the bonding force and sealing effect of the plastic frame 2 and the battery housing 1 can be further improved.

[0086] Preferably, if Figure 5 and Figure 6 As shown, both the first connecting portion 141 of the first battery housing 11 and the second connecting portion 142 of the second battery housing 12 are provided with a through hole 17 , and a portion of the plastic frame 2 is received in the through hole 17 .

[0087] Exemplarily, a plurality of through holes 17 are provided on the first connecting portion 141 of the first battery housing 11 along the length direction of the first connecting portion 141, and a plurality of through holes 17 are also provided on the second connecting portion 142 of the second battery housing 12 along the length direction of the second connecting portion 142. The plastic frame 2 passes through the plurality of through holes 17 to firmly connect and seal the battery housing 1, and the through holes 17 are spaced apart from the first groove 15 and the second groove 16.

[0088] It should be noted that those skilled in the art can also separately set the through hole 17 on the first connecting portion 141 of the first battery housing 11 or the second connecting portion 142 of the second battery housing 12, and can set the specific number and size of the through holes 17 according to the area of ​​the connecting portion 14, etc. Such flexible adjustment and change does not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0089] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0090] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A battery housing, characterized in that: It includes a bottom wall, a side wall arranged around the bottom wall and a connecting part arranged on the side wall, wherein the connecting part is provided with a plurality of first grooves, and the plurality of first grooves are arranged at intervals around the circumference of the side wall, and the angle between the first grooves and the outer end surface of the connecting part is a, wherein 0°<a<90°.

2. The battery housing according to claim 1, characterized in that: An included angle a between the first groove and the outer end surface of the connecting portion ranges from 40° to 50°.

3. The battery housing according to claim 1, characterized in that: The plurality of first grooves on the side wall on the same side are arranged in parallel.

4. The battery housing according to claim 1, characterized in that: The first grooves located at both sides of the side wall in the first direction intersect with the first grooves located at both sides of the side wall in the second direction.

5. The battery housing according to claim 1, characterized in that: The connecting portion further includes a plurality of second grooves spaced apart from each other circumferentially around the side wall, wherein the second grooves intersect with the first grooves.

6. The battery casing according to claim 5, characterized in that: The direction of the first groove is perpendicular to the direction of the second groove.

7. The battery housing according to claim 1, characterized in that: The depth of the first groove is any value between 10 μm and 290 μm; and / or, The width of the first groove is any value between 20 micrometers and 200 micrometers.

8. The battery casing according to claim 1, characterized in that: The width of the first groove area is a first width, and the width of the connecting portion is a second width, wherein a ratio of the first width to the second width is any value between 40% and 100%.

9. A battery, characterized in that: The battery includes a first battery shell, a second battery shell and a plastic frame. The first battery shell and / or the second battery shell is a battery shell as described in any one of claims 1 to 8. The plastic frame covers the outer end surface of the connecting part of the first battery shell and the second battery shell, and part of the plastic frame is accommodated in the first groove.

10. The battery according to claim 9, characterized in that The battery further includes a separator disposed between the first battery housing and the second battery housing, wherein: A gap is provided between the connecting portion of the first battery housing and the partition and / or between the connecting portion of the second battery housing and the partition, and part of the plastic frame is accommodated in the gap; and / or, The connecting portion of the first battery housing and / or the connecting portion of the second battery housing is provided with a through hole, and part of the plastic frame is received in the through hole.

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