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 problem that the structural strength and the sealing effect of a flange are affected due to the fact that a groove in the flange cannot be filled with an injection molding material when the conventional battery shell is sealed by injection molding. Therefore, according to the battery shell disclosed by the utility model, the plurality of grooves are formed in the surface of the connecting part and are distributed at intervals in the direction far away from the accommodating part, and the depth of the groove close to the accommodating part is smaller than that of the groove far away from the accommodating part; the situation that the groove close to one side of the containing part cannot be filled with the injection molding material can be avoided, and the situation that the structural strength and the sealing effect of the connecting part are affected is avoided.

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] Existing batteries usually use laser welding to achieve the connection and sealing of the shell. However, laser welding generally has the problem of low welding yield, resulting in poor sealing of the battery shell. In order to improve the connection strength and sealing effect of the battery shell, the battery shell can be connected and sealed by injection molding. Specifically, the flanges of the battery shell are first fitted together, and then a plastic frame covering the flange is injection molded on the flange to achieve connection, fixation and sealing of the battery shell connection. However, the bonding force between the plastic frame and the flange is weak and the sealing effect is poor. Therefore, multiple grooves can be set on the flange so that the plastic frame is partially contained in the groove during injection molding to enhance the bonding force and sealing effect. However, when multiple grooves are set, there will be a situation where the injection molding material cannot be filled, thereby affecting the structural strength of the flange and the sealing effect with the plastic frame.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem that the existing battery housing cannot be fully filled with injection molding material when injection molding is used for sealing, thereby affecting the structural strength of the connection part and the sealing effect with the plastic frame.

[0006] In a first aspect, the utility model provides a battery case, comprising a accommodating portion and a connecting portion arranged on the accommodating portion, the connecting portion being provided with a groove surrounding the accommodating portion, the grooves being provided in plurality and distributed at intervals, the grooves comprising a first groove and a second groove arranged outside the first groove, the depth of the first groove being less than the depth of the second groove.

[0007] In the preferred technical solution of the above battery casing, the depth of the first groove is h1, wherein 20 micrometers ≤ h1 ≤ 40 micrometers; and / or the depth of the second groove is h2, wherein 100 micrometers ≤ h2 ≤ 120 micrometers.

[0008] In the preferred technical solution of the battery case, a plurality of the first grooves and a plurality of the second grooves are provided respectively, the width of the region where the plurality of the first grooves are located is L1, and the width of the region where the plurality of the second grooves are located is L2, wherein L1<L2.

[0009] In a preferred technical solution of the above battery casing, the groove further includes a third groove, the third groove is located between the first groove and the second groove, and the depth of the third groove is h3, wherein 60 microns ≤ h3 ≤ 80 microns.

[0010] In the preferred technical solution of the above-mentioned battery shell, a plurality of the first grooves, the second grooves and the third grooves are respectively provided, the width of the area where the plurality of the first grooves are located is L1, the width of the area where the plurality of the second grooves are located is L2, and the width of the area where the plurality of the third grooves are located is L3, wherein L1≤L3<L2.

[0011] In the preferred technical solution of the above battery casing, the groove width is w, wherein 20 microns ≤ w ≤ 200 microns; and / or the groove spacing between two adjacent grooves is d, wherein 30 microns ≤ d ≤ 300 microns.

[0012] In the preferred technical solution of the battery housing, the width of the region where the groove is located is L0, and the width of the connecting portion is L, wherein 40%≤L0 / L≤100%.

[0013] In a preferred technical solution of the above battery housing, the groove is annular and is arranged around the accommodating portion.

[0014] 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 a battery shell as described in any one of the above items, and the plastic frame is covered on the outer end surface of the connecting part of the first battery shell and the connecting part of the second battery shell, and the plastic frame is partially accommodated in the groove.

[0015] In a preferred technical solution of the above battery, the battery further comprises a partition disposed between the first battery shell and the second battery shell, and the plastic frame covers the outer end surface of the connecting portion of the first battery shell, the partition and the connecting portion of the second battery shell.

[0016] When the above technical solution is adopted, the battery casing of the utility model can avoid the situation where the groove close to the accommodating portion cannot be fully filled with the molten injection molding material by making the depth of the groove close to the accommodating portion smaller than the depth of the groove far from the accommodating portion. This can avoid the situation where the structural strength of the connecting portion and the sealing effect with the plastic frame are affected by the groove on the connecting portion not being filled with the injection molding material, which is beneficial to ensuring the structural strength of the connecting portion and the sealing effect with the plastic frame.

[0017] Furthermore, the present invention limits the depth of the groove, thereby preventing the coupling force between the plastic frame and the battery housing from being affected due to the groove being too shallow, and preventing the structural strength of the connection portion from being affected due to the groove being too deep.

[0018] Furthermore, the utility model makes the width of the area where the multiple grooves with large depths are located greater than the width of the area where the multiple grooves with small depths are located, which not only helps to reduce the time for the molten injection material to flow into the grooves with small depths, but also can improve the connection reliability between the plastic frame and the connecting part while ensuring the structural strength of the connecting part.

[0019] Furthermore, the utility model provides the groove in a strip shape, which not only facilitates the processing of the groove, but also increases the contact area between the plastic frame and the connecting portion, thereby improving the bonding force between the plastic frame and the battery housing.

[0020] Furthermore, the utility model limits the width and groove spacing of the grooves, making the layout of the grooves more reasonable, facilitating increasing the number of grooves, thereby further improving the bonding strength and sealing between the plastic frame and the battery shell, and preventing the plastic frame from falling off and leaking.

[0021] Furthermore, the utility model can further improve the bonding strength and sealing between the plastic frame and the battery shell by making the ratio δ of the width of the groove area to the width of the connecting portion any value between 40% and 100%, which is more conducive to avoiding the plastic frame from falling off and leaking during use of the battery, thereby improving the safety and reliability of the battery.

[0022] In addition, the battery further provided by the present invention on the basis of the above technical solution includes the above battery housing, and thus has the technical effects possessed by the above battery housing. Compared with the battery before the improvement, the battery of the present invention has better sealing and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 It is a schematic diagram of the explosion of the battery of the utility model;

[0025] Figure 2 It is a schematic diagram of the assembly of the battery of the utility model;

[0026] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0027] Figure 4 It is a structural schematic diagram of the first embodiment of the battery housing of the utility model;

[0028] Figure 5 It is a structural schematic diagram of a second embodiment of the battery housing of the utility model;

[0029] Figure 6 It is a structural schematic diagram of a third embodiment of a battery housing of the utility model;

[0030] Figure 7 It is a structural schematic diagram of a first embodiment of the first connecting portion of the utility model;

[0031] Figure 8 It is a structural schematic diagram of a second embodiment of the first connecting part of the utility model.

[0032] List of reference numerals:

[0033] 1. Shell assembly; 11. First battery shell; 12. Second battery shell; 13. Partition plate; 14. Connecting portion; 141. First connecting portion; 15. Groove; 151. First groove; 152. Second groove; 153. Third groove; 142. Second connecting portion;

[0034] 2. Plastic frame. DETAILED DESCRIPTION

[0035] 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.

[0036] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right" and the like 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] 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.

[0038] The utility model provides a novel battery shell, which includes a receiving portion and a connecting portion 14 arranged on the receiving portion. The connecting portion 14 is the above-mentioned flange. The receiving portion is the middle part of the battery shell for receiving the battery cell, and a cavity for receiving the battery cell is formed inside the receiving portion.

[0039] See first Figures 1 to 3 ,in, Figure 1 This is a schematic diagram of the explosion of the battery of the utility model. Figure 2 This is a schematic diagram of the assembly of the battery of the utility model. Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0040] like Figures 1 to 3 As shown, the connection part 14 is arranged around the receiving part, that is, the connection part 14 is arranged along the circumference of the receiving part. Preferably, the receiving part usually has an opening for placing or removing the battery cell, and the connection part 14 is formed by extending from the edge of the opening toward a direction away from the receiving part.

[0041] By providing the groove 15 on the surface of the connecting portion 14 , during the injection molding process, the molten injection slurry will penetrate into the groove 15 , thereby improving the bonding force and sealing effect between the plastic frame 2 and the connecting portion 14 .

[0042] like Figure 1 As shown, the utility model further provides a battery. The battery of the utility model comprises a shell assembly 1 and a battery cell (not shown) installed in the shell assembly 1 .

[0043] In preferred example 1, Figures 1 to 3 As shown, the housing assembly 1 of the utility model includes a partition 13, in the thickness direction ( Figure 1 and Figure 3 The battery shells are arranged on both sides of the partition 13 in the vertical direction (in the vertical direction), wherein, for the convenience of the following description and understanding, the battery shells located on both sides of the partition 13 are named as the first battery shell 11 and the second battery shell 12, respectively, the connecting portion on the first battery shell 11 is the first connecting portion 141, and the connecting portion on the second battery shell 12 is the second connecting portion 142. The first connecting portion 141, the edge of the partition 13 and the second connecting portion 142 are respectively superimposed on each other.

[0044] The battery cell of the utility model includes a first battery cell and a second battery cell, wherein the first battery cell is contained in a closed first cavity formed between the first battery housing 11 and the partition 13, and the second battery cell is contained in a closed second cavity formed between the second battery housing 12 and the partition 13. In other embodiments, the battery cells can be distributed and arranged as required according to the structure of the housing assembly 1, which will not be described in detail here.

[0045] Furthermore, a groove 15 is provided on the surface of the first connection portion 141 , and a groove 15 is also provided on the surface of the second connection portion 142 .

[0046] like Figures 1 to 3 As shown, the battery of the utility model further includes a plastic frame 2, which is coated on the first connecting portion 141, the edge of the partition 13 and the outer end surface of the second connecting portion 142 to achieve the connection and sealing of the first battery housing 11, the partition 13 and the second battery housing 12. The plastic frame 2 is partially received in the groove 15 of the first connecting portion 141 and the groove 15 of the second connecting portion 142, wherein the battery housings 11 and 12 are made of metal, preferably aluminum shells.

[0047] That is to say, the utility model uses a plastic frame 2 to seal and connect the first battery shell 11, the partition 13 and the second battery shell 12. Compared with the laser welding method used in the prior art, the injection molding sealing method has good sealing performance and high yield, and can be injection molded and sealed in large quantities at the same time, with high efficiency and low cost. In addition, the connection between the plastic frame 2 and the first battery shell 11 and the second battery shell 12 can be achieved through physical methods (such as heating, etc.) to achieve non-destructive disassembly, which is convenient for the recycling and reuse of the shell assembly 1.

[0048] For example, Figures 1 to 3 As shown, the plastic frame 2 is also arranged along the circumference of the accommodating portion. 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 edge of the first battery shell 11, the partition 13 and the circumference of the second battery shell 12.

[0049] For example, Figures 1 to 3 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 groove 15, the lower surface of the first connection part 141 is fitted with the top surface of the partition 13, the lower surface of the second connection part 142 is provided with a groove 15, the upper surface of the second connection part 142 is fitted with the bottom surface of the partition 13, and the plastic frame 2 at least partially covers the first connection part 141 and the second connection part 142, so as to connect, fix and seal the first connection part 141 and the partition 13 as well as the second connection part 142 and the partition 13.

[0050] It should be noted that, in actual application, those skilled in the art may only provide the groove 15 on the first connection portion 141, or only provide the groove 15 on the second connection portion 142. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention. Of course, the housing assembly 1 of the present invention preferably provides the groove 15 on both the first connection portion 141 and the second connection portion 142.

[0051] In preferred example 2, the shell assembly includes a first battery shell 11 and a second battery shell 12 arranged along the thickness direction, the connecting part of the first battery shell 11 is a first connecting part 141, and the connecting part on the second battery shell 12 is a second connecting part 142. The first connecting part 141 is provided with a groove 15 on the surface connected to the plastic frame and / or the second connecting part 142 is also provided with a groove 15 on the surface connected to the plastic frame.

[0052] That is, compared with the housing assembly 1 in the preferred example 1, the housing assembly in the preferred example eliminates the partition plate 13 disposed between the first battery housing 11 and the second battery housing 12 .

[0053] It should be noted that, in actual applications, those skilled in the art may set the groove 15 to be cylindrical, square, or strip-shaped, etc. Such adjustment and change of the specific shape of the groove 15 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.

[0054] It should be noted that the following description is made by taking the groove 15 on the first connection portion 141 as an example. Similarly, the groove 15 on the second connection portion 142 also satisfies the description below.

[0055] It should be noted that, in actual applications, those skilled in the art may extend the groove 15 along the length direction of the first connection part 141, or extend the groove 15 along the width direction of the first connection part 141, or extend the groove 15 at an angle, 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.

[0056] Preferably, if Figures 4 to 6 As shown, the groove 15 is annular along the circumference of the first battery housing 11 .

[0057] By making the groove 15 form a circle along the circumference of the first battery housing 11 to form a closed annular path, the bonding force between the plastic frame 2 and the first battery housing 11 can be improved, and the sealing effect of the first battery housing 11 can be improved.

[0058] In the first preferred case, if Figure 4 As shown, the groove 15 passes through the first connecting portion 141 along the length direction of the first connecting portion 141 .

[0059] For example, Figure 4 As shown, the groove 15 on the long side of the first connection part 141 passes through the long side of the first connection part 141 along the length direction of the long side of the first connection part 141, and the groove 15 on the short side of the first connection part 141 passes through the short side of the first connection part 141 along the length direction of the short side of the first connection part 141. In this way, the two ends of the groove 15 located on the long side of the first connection part 141 are respectively connected to the corresponding grooves 15 on the short side of the first connection part 141, and the two ends of the groove 15 located on the short side of the first connection part 141 are respectively connected to the corresponding grooves 15 on the long side of the first connection part 141, so that the groove 15 forms a ring along the circumference of the shell assembly 1.

[0060] like Figure 4 As shown, in this preferred case, the number of the grooves 15 is preferably set to multiple, and the multiple grooves 15 are spaced apart along the width direction of the first connecting portion 141. Each groove 15 penetrates the first connecting portion 141 along the length direction of the first connecting portion 141. In the four right-angle range areas of the first connecting portion 141, the grooves 15 on the long side of the first connecting portion 141 intersect with the grooves 15 on the short side of the first connecting portion 141, and have overlapping areas. The multiple grooves 15 are preferably distributed at equal intervals.

[0061] In the second preferred case, if Figure 5 As shown, the ring formed by the grooves 15 is rectangular. That is, the grooves 15 on the long side of the first connecting portion 141 are connected end to end with the grooves 15 on the short side of the first connecting portion 141 to form a rectangular closed path.

[0062] like Figure 5 As shown, in this preferred case, the number of the grooves 15 is also preferably set to multiple, and the multiple grooves 15 are spaced apart along the width direction of the first connecting portion 141. That is, a plurality of rectangular annular grooves are provided on the first connecting portion 141, and the multiple annular grooves are distributed in an array, and the length of the annular grooves gradually increases in the direction away from the first battery housing 11 (i.e., from the inside to the outside). The multiple grooves 15 are preferably distributed at equal intervals.

[0063] In the third preferred case, if Figure 6 As shown, the ring formed by the groove 15 is rectangular, and the four corners of the ring are all set to be rounded.

[0064] By setting the four corners of the ring formed by the groove 15 to be rounded, it is not only beneficial to the processing of the groove 15, but also beneficial for the injection material to flow along the groove 15, so that the entire ring-shaped groove 15 is completely filled.

[0065] like Figure 6 As shown, in this preferred case, the number of the grooves 15 is also preferably set to be multiple, and the multiple grooves 15 are distributed at intervals along the width direction of the connecting portion 14. Moreover, the multiple grooves 15 are preferably distributed at equal intervals.

[0066] Preferably, if Figure 7 and Figure 8 As shown, the depth h of the groove 15 is any value between 10 μm and 290 μm.

[0067] For example, in practical applications, those skilled in the art may set the depth h of the groove 15 to 10 micrometers, 50 micrometers, 100 micrometers, 150 micrometers, 200 micrometers, 250 micrometers or 290 micrometers.

[0068] It should be pointed out that the depth h of the groove 15 refers to the dimension of the groove 15 along the thickness direction of the first connecting portion 141. By limiting the depth h of the groove 15, it is possible to avoid affecting the bonding force between the plastic frame 2 and the first battery housing 11 due to the groove 15 being too shallow, and to avoid affecting the structural strength of the first connecting portion 141 due to the groove 15 being too deep. The depth h of the groove 15 is further preferably any value between 50 microns and 150 microns.

[0069] In the first preferred example, Figure 7 As shown, the number of grooves 15 is set to be multiple, wherein the depths h of the multiple grooves 15 are the same, and the depth h of the groove 15 is preferably any value from 10 microns to 290 microns, and further preferably any value from 50 microns to 150 microns.

[0070] For example, Figure 7 As shown, the plurality of grooves 15 are distributed at intervals along a direction away from the first battery housing 11 , and the plurality of grooves 15 are distributed at equal intervals.

[0071] It should be noted that, in actual applications, those skilled in the art may also distribute the multiple grooves 15 at intervals along the length direction of the first connecting portion 141. 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.

[0072] In the second preferred example, Figure 8As shown, the number of grooves 15 is set to be multiple, and the multiple grooves 15 are spaced apart in a direction away from the first battery housing 11 , wherein the depth of some grooves 15 close to the first battery housing 11 is less than the depth of some grooves 15 away from the first battery housing 11 .

[0073] That is, when a plurality of grooves 15 are provided, the depths of the grooves 15 are not the same, and the grooves 15 near the first battery housing 11 (from the bottom to the top) are not the same. Figure 8 The depth of the groove 15 of the first connecting portion 141 is small, and the side away from the first battery housing 11 (from the left side of the first connecting portion 141) is small. Figure 8 The depth of the groove 15 (on the right side of the first connecting portion 141 when viewed from above) is large. Through such a setting, it is possible to avoid the situation where the groove 15 close to the side of the first battery shell 11 cannot be fully filled with the injection molding material, which is beneficial to ensuring the structural strength of the first connecting portion 141.

[0074] Example 1, such as Figure 8 As shown, the multiple grooves 15 are composed of multiple first grooves 151, multiple second grooves 152 and multiple third grooves 153. The first groove 151 is arranged close to the first battery housing 11, and the second groove 152 is arranged away from the first battery housing 11, that is, the second groove 152 is located on the outside of the first groove 151, and the outside of the first groove 151 refers to the side away from the accommodating portion. The third groove 153 is located between the first groove 151 and the second groove 152, the depth of the first groove 151 is less than the depth of the third groove 153, and the depth of the third groove 153 is less than the depth of the second groove 152.

[0075] Preferably, if Figure 8 As shown, in this Example 1, the depth h1 of the first groove 151 is any value between 20 μm and 40 μm.

[0076] For example, the depth h1 of the first groove 151 may be set to 20 micrometers, 25 micrometers, 30 micrometers, 35 micrometers, or 40 micrometers.

[0077] Preferably, if Figure 8 As shown, in this Example 1, the depth of the third groove 153 is any value between 60 micrometers and 80 micrometers.

[0078] For example, the depth h3 of the third groove 153 may be set to 60 micrometers, 65 micrometers, 70 micrometers, 75 micrometers, or 80 micrometers.

[0079] Preferably, if Figure 8 As shown, in this Example 1, the depth of the second groove is any value between 100 μm and 120 μm.

[0080] For example, the depth h2 of the second groove may be set to 100 micrometers, 105 micrometers, 110 micrometers, 115 micrometers, or 120 micrometers.

[0081] Preferably, if Figure 8 As shown, in Example 2, the width of the region where the plurality of first grooves 151 are located is L1, the width of the region where the plurality of second grooves 152 are located is L2, and the width of the region where the plurality of third grooves 153 are located is L3, wherein L1≤L3<L2. By setting the width of the region of the second groove 152 to be larger, the bonding strength and sealing effect between the plastic frame 2 and the first battery housing 11 and the second battery housing 12 can be effectively enhanced, while setting the width of the region of the first groove 151 and the third groove 153 to be smaller can allow the molten plastic to flow quickly into the first groove 151 and the third groove 153, thereby improving the efficiency of injection molding, saving time, and ensuring that the first groove 151 and the third groove 153 are filled.

[0082] For example, the total number of grooves 15 is 7, among which the number of first grooves 151 is 2, the number of third grooves 153 is 2, and the number of second grooves 152 is 3. The width L1 of the area occupied by the two first grooves 151 is 1.0 mm, the width L3 of the area occupied by the two third grooves 153 is 1.0 mm, and the width L2 of the area occupied by the three second grooves 152 is 1.5 mm.

[0083] It should be noted that, except for the different depths, the widths and groove spacings of the first groove 151 , the second groove 152 and the third groove 153 are preferably set to be the same.

[0084] Example 2. In this embodiment, the content is substantially the same as that of Example 1, and the only difference is the lack of the technical feature of the third groove, that is, the groove only includes the first groove and the second groove. The specific technical content can be referred to Example 1 and will not be repeated here.

[0085] Preferably, if Figure 7 and Figure 8 As shown, the groove spacing d between two adjacent grooves 15 is set to any value between 30 μm and 300 μm.

[0086] For example, the groove spacing d between two grooves 15 can be set to 30 microns, 50 microns, 100 microns, 150 microns, 200 microns, 250 microns or 300 microns. The groove spacing d between two adjacent grooves 15 is further preferably set to any value between 100 microns and 200 microns.

[0087] It should be noted that the groove spacing d between the two adjacent grooves 15 is in the width direction of the first connecting portion 141 ( Figure 7 and Figure 8In the left and right direction), the distance between the center lines of two adjacent grooves 15 is as follows: Figure 7 and Figure 8 As shown in d.

[0088] Preferably, if Figure 7 and Figure 8 As shown, the width w of the groove 15 is preferably any value between 20 micrometers and 200 micrometers.

[0089] Exemplarily, the width w of the groove 15 can be set to 20 microns, 50 microns, 80 microns, 100 microns, 120 microns, 150 microns, 180 microns or 200 microns. Among them, the width w of the groove 15 is further preferably set to any value between 50 microns and 120 microns. By limiting the width of the first groove, it is possible to avoid the reduction in the number of 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 portion, and to avoid the grooving efficiency and grooving rate due to the width of the first groove being too narrow.

[0090] It should be noted that, in the case where a plurality of grooves 15 are provided, it is preferred that the widths of the plurality of grooves 15 be set to be the same. Setting the groove width parameter can allow the molten plastic to flow quickly into the groove 17, thus meeting the efficiency requirements of the injection molding process.

[0091] Preferably, if Figure 3 As shown, the ratio δ of the width L0 of the groove 15 area to the width L of the first connecting portion 141 is any value between 40% and 100%.

[0092] That is to say, the width of the groove 15 area on the surface of the first connection portion 141 is at least 40% of the width of the first connection portion 141. Through such a configuration, the plastic frame 2 can be prevented from falling off during use of the battery, thereby improving the safety and reliability of the battery.

[0093] For example, the ratio δ may be set to 40%, 50%, 60%, 70%, 80%, 90% or 100%, wherein the ratio δ is further preferably set to any value between 70% and 100%.

[0094] For example, Figure 3 As shown, the width of the upper surface of the first connection part 141 is L, the width of the area on the upper surface of the first connection part 141 where the groove 15 is provided is L0, and the groove 15 on the upper surface of the first connection part 141 extends along the length direction of the first connection part 141 and passes through the first connection part 141, then the ratio δ=100%×(L0 / L), for example, L0=3.0mm, L=4.0mm, then the ratio δ=100%×(3 / 4)=75%.

[0095] 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.

[0096] 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 housing portion and a connecting portion arranged on the housing portion, the connecting portion is provided with a groove surrounding the housing portion, the grooves are provided in plurality and are distributed at intervals, the grooves include a first groove and a second groove arranged outside the first groove, the depth of the first groove is less than the depth of the second groove.

2. The battery housing according to claim 1, characterized in that: The depth of the first groove is h1, wherein 20 micrometers ≤ h1 ≤ 40 micrometers; and / or, The depth of the second groove is h2, wherein 100 micrometers ≤ h2 ≤ 120 micrometers.

3. The battery housing according to claim 2, characterized in that: There are a plurality of the first grooves and a plurality of the second grooves, respectively. The width of a region where the plurality of the first grooves are located is L1, and the width of a region where the plurality of the second grooves are located is L2, wherein L1<L2.

4. The battery casing according to claim 2, characterized in that: The groove further includes a third groove, and the third groove is located between the first groove and the second groove. The depth of the third groove is h3, wherein 60 micrometers ≤ h3 ≤ 80 micrometers.

5. The battery casing according to claim 4, characterized in that: There are a plurality of the first grooves, the second grooves and the third grooves respectively, the width of the region where the plurality of the first grooves are located is L1, the width of the region where the plurality of the second grooves are located is L2, and the width of the region where the plurality of the third grooves are located is L3, wherein L1≤L3<L2.

6. The battery case according to claim 1, characterized in that: The groove width of the groove is w, wherein 20 micrometers ≤ w ≤ 200 micrometers; and / or, The groove spacing between two adjacent grooves is d, wherein 30 micrometers ≤ d ≤ 300 micrometers.

7. The battery housing according to claim 1, characterized in that: The width of the region where the groove is located is L0, and the width of the connecting portion is L, wherein 40%≤L0 / L≤100%.

8. The battery casing according to claim 1, characterized in that: The groove is annular and is arranged around the accommodating portion.

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 is covered on the outer end surfaces of the connecting parts of the first battery shell and the second battery shell, and the plastic frame is partially accommodated in the groove.

10. The battery according to claim 9, characterized in that The battery further includes a partition disposed between the first battery housing and the second battery housing, and the plastic frame covers the outer end surface of the connecting portion of the first battery housing, the partition, and the connecting portion of the second battery housing.

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