Battery case and battery

Abstract

The utility model relates to battery technology field, concretely provides a kind of battery shell and battery, to solve the problem of weak combination strength and poor sealing of existing battery shell when using injection molding sealing.The battery shell of the utility model includes accommodating part and the connecting part of accommodating part, the surface of connecting part is provided with recess, the depth of recess is any value in 10 microns to 290 microns, the width of recess is any value in 20 microns to 200 microns.By setting recess on connecting part and limiting the depth and width of recess, not only the combination of shell and plastic frame and sealing effect can be improved, but also the structural strength of connecting part can be avoided due to the depth of recess being too deep, while it is beneficial to the molten injection molding slurry to flow into recess quickly to improve processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically providing a battery casing and a battery. Background Technology

[0002] New energy vehicles have attracted increasing attention due to their low noise, zero pollution, and high energy efficiency, thus accelerating their development. Currently, new energy vehicles typically use batteries as their power source, which provides ample room for the application and development of lithium-ion batteries.

[0003] Current batteries typically use laser welding to connect and seal the casing. However, laser welding generally suffers from low yield rates, resulting in insufficient connection strength and poor sealing performance. To improve the connection strength and sealing performance of the battery casing, injection molding can be performed at the connection points to achieve a better connection and seal. Specifically, the flanges of the battery casing are first bonded together, and then a plastic frame is injection molded onto the flanges to form a cover, thus securing and sealing the connection points. However, the flanges of existing battery casings are usually smooth flat surfaces, resulting in weak bonding force with the plastic frame and poor sealing performance, affecting the stability and safety of the battery structure.

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

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that the bonding force between the battery casing and the plastic frame is weak and the sealing effect is poor when injection molding is used.

[0006] In a first aspect, the present invention provides a battery housing, the battery housing including a receiving portion and a connecting portion disposed in the receiving portion, the connecting portion having a groove surrounding the receiving portion, the depth of the groove being h, wherein 10 micrometers ≤ h ≤ 290 micrometers, and the width of the groove being w, wherein 20 micrometers ≤ w ≤ 200 micrometers.

[0007] In the preferred embodiment of the battery casing described above, 50 micrometers ≤ h ≤ 150 micrometers; and / or, 50 micrometers ≤ w ≤ 120 micrometers.

[0008] In the preferred embodiment of the battery casing described above, the number of grooves is multiple and they are spaced apart, and the groove spacing between two adjacent grooves is d, wherein 30 micrometers ≤ d ≤ 300 micrometers.

[0009] In the preferred technical solution of the above battery casing, 100 micrometers ≤ d ≤ 200 micrometers.

[0010] In the preferred embodiment of the battery casing described above, the groove includes a first groove and a second groove disposed outside the first groove, wherein the depth of the second groove is greater than the depth of the first groove.

[0011] In the preferred embodiment of the battery casing described above, the plurality of grooves are equidistantly distributed.

[0012] In the preferred embodiment of the battery casing described above, the width of the groove area is L0, and the width of the connecting part is L, wherein 40% ≤ L0 / L ≤ 100%.

[0013] In the preferred embodiment of the battery casing described above, the groove is annular and surrounds the receiving portion.

[0014] In a second aspect, the present invention also provides a battery, the battery comprising a first battery housing, a second battery housing, and a plastic frame, wherein the first battery housing and / or the second battery housing are any of the battery housings described above, and the plastic frame covers the outer end face of the connecting portion of the first battery housing and the connecting portion of the second battery housing, and the plastic frame is partially received in the groove.

[0015] In the preferred embodiment of the battery casing described above, the battery further includes a partition disposed between the first battery casing and the second battery casing, and the plastic frame covers the connecting portion of the first battery casing, the partition, and the outer end face of the connecting portion of the second battery casing.

[0016] By adopting the above technical solution, this utility model, by setting a groove on the connecting part of the battery casing and limiting the depth and width of the groove, firstly, can achieve a stable connection between the connecting part and the plastic frame, improving the sealing effect between the connecting part and the plastic frame; secondly, it facilitates the rapid flow of molten injection slurry into the groove and can improve the bonding force and sealing effect between the plastic frame and the casing, which helps to avoid the plastic frame shaking or falling off, reducing or even eliminating the risk of the plastic frame falling off; and thirdly, it can also prevent the structural strength of the connecting part from being affected by the excessive depth of the groove.

[0017] Furthermore, by setting the groove as a closed ring surrounding the receiving part, this utility model not only facilitates the processing of the groove, but also increases the contact area between the plastic frame and the housing, thereby improving the bonding force between the plastic frame and the housing, and also improving the sealing effect of the plastic frame on the battery housing, preventing the electrolyte inside the battery housing from flowing out.

[0018] Furthermore, by making the depth of the groove near the receiving part less than the depth of the groove far from the receiving part, this invention can avoid the situation where the groove near the receiving part cannot be filled by the molten injection slurry in time.

[0019] Furthermore, the battery provided by this utility model, based on the above technical solution, includes the aforementioned casing and thus possesses the technical effects of the casing. Compared to the battery before the improvement, the battery of this utility model has better sealing performance and higher safety. Attached Figure Description

[0020] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0021] Figure 1 This is an exploded schematic diagram of the battery of this utility model;

[0022] Figure 2 This is an assembly diagram of the battery of this utility model;

[0023] Figure 3 yes Figure 2 Sectional view at point AA;

[0024] Figure 4 This is a schematic diagram of the structure of the first embodiment of the battery casing of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second embodiment of the battery casing of this utility model;

[0026] Figure 6 This is a structural schematic diagram of the third embodiment of the battery casing of this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the first embodiment of the first connecting part of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the second embodiment of the first connecting part of this utility model.

[0029] List of reference numerals in the attached diagram:

[0030] 1. Housing assembly; 11. First battery housing; 12. Second battery housing; 13. Separator; 14. Connecting part; 141. First connecting part; 15. Groove; 151. First groove; 152. Second groove; 153. Third groove; 142. Second connecting part;

[0031] 2. Plastic frame. Detailed Implementation

[0032] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] It should be noted that in the description of this utility model, terms such as "inner," "outer," "upper," "lower," "left," and "right," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Furthermore, it should be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connect," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Since the flanges of existing battery casings are usually smooth planes, the bonding force between the flange and the plastic frame is weak and the sealing effect is poor when injection molding is performed on the flange. Therefore, this utility model provides a new type of battery casing, which includes a receiving part and a connecting part 14 disposed on the receiving part. The connecting part 14 is the aforementioned flange. The receiving part is the middle part of the battery casing used to receive the battery cell, and its interior forms a cavity for receiving the battery cell.

[0036] First refer to Figures 1 to 3 ,in, Figure 1 This is an exploded schematic diagram of the battery of this utility model. Figure 2 This is an assembly diagram of the battery of this utility model. Figure 3 yes Figure 2 Sectional view at point AA.

[0037] Preferably, such as Figure 3 As shown, the surface of the connecting part 14 is provided with a groove 15 for accommodating injection molding material (e.g., plastic), and the groove 15 is disposed around the receiving part.

[0038] By providing a groove 15 on the surface of the connecting part 14, the molten injection slurry will seep into the groove 15 during the injection molding process, thereby improving the bonding force and sealing effect between the plastic frame 2 and the connecting part 14.

[0039] like Figure 1 As shown, this utility model also provides a battery, which includes a housing assembly 1 and a battery cell (not shown) installed in the housing assembly 1.

[0040] In preferred example 1, such as Figures 1 to 3As shown, the housing assembly 1 of this utility model includes a partition 13 and battery housings disposed on both sides of the partition 13 in the thickness direction. For ease of description and understanding, the battery housings on both sides of the partition 13 are respectively named a first battery housing 11 and a second battery housing 12. The connecting portion on the first battery housing 11 is called a first connecting portion 141, and the connecting portion on the second battery housing 12 is called a 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.

[0041] The battery cell of this utility model includes a first battery cell and a second battery cell. The first battery cell is housed in a closed first cavity formed between a first battery casing 11 and a separator 13, and the second battery cell is housed in a closed second cavity formed between a second battery casing 12 and a separator 13. In other embodiments, the battery cells can be distributed and arranged as needed according to the structure of the casing assembly 1 described above, which will not be elaborated here.

[0042] Furthermore, the surface of the first connecting part 141 is provided with a groove 15, and the surface of the second connecting part 142 is also provided with a groove 15.

[0043] like Figures 1 to 3 As shown, the battery of this utility model also includes a plastic frame 2, which covers the edges of the first connecting part 141, the separator 13, and the outer end face of the second connecting part 142 to achieve connection and sealing of the first battery housing 11, the separator 13, and the second battery housing 12. The plastic frame 2 is partially housed in the groove 15 of the first connecting part 141 and the groove 15 of the second connecting part 142. The first battery housing 11 and the second battery housing 12 are made of metal, preferably aluminum.

[0044] In other words, this utility model uses a plastic frame 2 to seal and connect the first battery housing 11, the separator 13, and the second battery housing 12. Compared with the prior art, which uses laser welding to seal and connect the first battery housing 11, the separator 13, and the second battery housing 12, this invention uses injection molding to seal and connect them. The plastic frame 2 has a strong bond with the first battery housing 11, the separator 13, and the second battery housing 12, with good sealing performance and high yield. In addition, it can be injection molded and sealed in large batches at the same time, which is efficient and low-cost. Furthermore, the connection between the plastic frame 2 and the first battery housing 11 and the second battery housing 12 can be disassembled without damage by physical methods (such as heating), which facilitates the recycling and reuse of the housing assembly 1.

[0045] For example, such as Figures 1 to 3As shown, a plastic frame 2 is also arranged around the circumference of the receiving part. The plastic frame 2 is made of plastic. During the processing, the assembled battery is first placed into the injection mold, and then the molten plastic is injected into the injection mold. After the plastic cools, a plastic frame 2 is formed around the edge of the first battery housing 11, the separator 13 and the circumference of the second battery housing 12.

[0046] For example, such as Figures 1 to 3 As shown, the first connecting part 141 and the second connecting part 142 are respectively arranged around the circumference of the first battery housing 11 and the second battery housing 12. The upper surface of the first connecting part 141 is provided with a groove 15, and the lower surface of the first connecting part 141 is attached to the top surface of the partition 13. The lower surface of the second connecting part 142 is provided with a groove 15, and the upper surface of the second connecting part 142 is attached to the bottom surface of the partition 13. The plastic frame 2 at least partially covers the first connecting part 141 and the second connecting part 142, thereby connecting, fixing and sealing the first connecting part 141 and the partition 13 and the second connecting part 142 and the partition 13.

[0047] It should be noted that, in practical applications, those skilled in the art may provide the groove 15 only on the first connecting portion 141, or only on the second connecting portion 142. Such flexible adjustments and changes do not deviate from the principle and scope of this utility model, and should all be limited to the protection scope of this utility model. Of course, the housing assembly 1 of this utility model preferably provides the groove 15 on both the first connecting portion 141 and the second connecting portion 142.

[0048] In preferred embodiment 2, the housing assembly includes a first battery housing 11 and a second battery housing 12 arranged along the thickness direction. The connecting portion of the first battery housing 11 is a first connecting portion 141, and the connecting portion on the second battery housing 12 is a second connecting portion 142. The first connecting portion 141 has a groove 15 on the surface connected to the plastic frame, and / or the second connecting portion 142 also has a groove 15 on the surface connected to the plastic frame.

[0049] In other words, compared to the housing assembly 1 in preferred example 1, the housing assembly in this preferred example eliminates the partition 13 disposed between the first battery housing 11 and the second battery housing 12.

[0050] It should be noted that, in practical applications, those skilled in the art can set the groove 15 to be cylindrical, square, or strip-shaped, etc. Such adjustments and changes to the specific shape of the groove 15 do not deviate from the scope and range of this utility model, and should be limited to the protection scope of this utility model.

[0051] Preferably, such as Figures 4 to 6 As shown, groove 15 is strip-shaped.

[0052] By setting the groove 15 to a strip shape, it is not only easier to process the groove 15, but also to increase the contact area between the plastic frame 2 and the housing assembly 1, thereby improving the bonding force and sealing effect between the plastic frame 2 and the housing assembly 1.

[0053] It should be noted that the following description takes the groove 15 on the first connecting part 141 as an example. Similarly, the groove 15 on the second connecting part 142 also satisfies the following description.

[0054] It should be noted that, in practical applications, those skilled in the art can make the groove 15 extend along the length direction of the first connecting part 141, or the groove 15 extend along the width direction of the first connecting part 141, or the groove 15 extend at an angle, etc. Such flexible adjustments and changes do not deviate from the principle and scope of this utility model, and should all be limited to the protection scope of this utility model.

[0055] Preferably, such as Figures 4 to 6 As shown, the groove 15 forms a ring around the circumference of the first battery casing 11.

[0056] By making the groove 15 encircle 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 also be improved.

[0057] In the first preferred case, such as Figure 4 As shown, the groove 15 extends through the first connecting portion 141 along its length.

[0058] For example, such as Figure 4 As shown, the groove 15 on the long side of the first connecting part 141 extends through the long side of the first connecting part 141 along the length direction of the long side of the first connecting part 141, and the groove 15 on the short side of the first connecting part 141 extends through the short side of the first connecting part 141 along the length direction of the short side of the first connecting part 141. In this way, the two ends of the groove 15 on the long side of the first connecting part 141 are respectively connected to the corresponding groove 15 on the short side of the first connecting part 141, and the two ends of the groove 15 on the short side of the first connecting part 141 are respectively connected to the corresponding groove 15 on the long side of the first connecting part 141, so that the groove 15 forms a ring around the circumference of the housing assembly 1.

[0059] like Figure 4As shown, in this preferred embodiment, the number of grooves 15 is preferably 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 its length direction. In the four right-angle regions 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, forming overlapping areas. The multiple grooves 15 are preferably evenly spaced.

[0060] In the second preferred scenario, such as 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 part 141 are connected end to end with the grooves 15 on the short side of the first connecting part 141, forming a rectangular closed path.

[0061] like Figure 5 As shown, in this preferred embodiment, the number of grooves 15 is preferably multiple, and the multiple grooves 15 are distributed at intervals along the width direction of the first connecting portion 141. That is, multiple rectangular annular grooves are provided on the first connecting portion 141, and the multiple annular grooves are distributed in an array. Along the direction away from the first battery housing 11 (i.e., from the inside to the outside), the length of the annular grooves gradually increases. The multiple grooves 15 are preferably distributed at equal intervals.

[0062] In the third preferred case, such as Figure 6 As shown, the ring formed by the groove 15 is rectangular, and all four corners of the ring are rounded.

[0063] By setting the four corners of the ring formed by the groove 15 to rounded corners, it is not only beneficial to the processing of the groove 15, but also to the flow of the injection molding material along the groove 15, so as to completely fill the entire annular groove 15.

[0064] like Figure 6 As shown, in this preferred embodiment, the number of grooves 15 is preferably set to multiple, and the multiple grooves 15 are distributed at intervals along a direction away from the first battery casing 11. Furthermore, the multiple grooves 15 are preferably distributed at equal intervals.

[0065] Preferably, such as Figure 7 As shown, the depth h of the groove 15 is any value between 10 micrometers and 290 micrometers.

[0066] For example, those skilled in the art can set the depth h of the groove 15 to 10 micrometers, 50 micrometers, 100 micrometers, 150 micrometers, 200 micrometers, 250 micrometers or 290 micrometers in practical applications.

[0067] Furthermore, the depth h of the groove 15 refers to the dimension of the groove 15 along the thickness direction of the first connecting part 141. By limiting the depth of the groove 15, it is possible to avoid affecting the bonding force between the plastic frame 2 and the first battery casing 11 due to the groove 15 being too shallow, and to avoid affecting the structural strength of the first connecting part 141 due to the groove 15 being too deep. The depth h of the groove 15 is further preferably any value between 50 micrometers and 150 micrometers.

[0068] In the first preferred example, such as Figure 7 As shown, the number of grooves 15 is set to multiple, wherein the depth h of the multiple grooves 15 is the same. The depth h of the grooves 15 is preferably any value from 10 micrometers to 290 micrometers, and more preferably any value from 50 micrometers to 150 micrometers.

[0069] For example, such as Figure 7 As shown, multiple grooves 15 are spaced apart along a direction away from the first battery casing 11, and the multiple grooves 15 are equally spaced.

[0070] It should be noted that, in practical applications, those skilled in the art can also distribute multiple grooves 15 at intervals along the length direction of the first connecting portion 141. Such flexible adjustments and changes do not deviate from the principle and scope of this utility model and should be limited to the protection scope of this utility model.

[0071] In the second preferred example, such as Figure 8 As shown, the number of grooves 15 is set to multiple, and the multiple grooves 15 are distributed at intervals along the direction away from the first battery housing 11, wherein the depth of the portion of grooves 15 closer to the first battery housing 11 is less than the depth of the portion of grooves 15 farther from the first battery housing 11.

[0072] In other words, when multiple grooves 15 are provided, the depth of the grooves 15 is not the same, and the depth is closer to the first battery casing 11 (from...). Figure 8 The groove 15 (viewed from above, on the left side of the first connecting part 141) has a small depth and is located away from the side of the first battery casing 11 (from...). Figure 8 The groove 15 (viewed from above, on the right side of the first connecting part 141) has a large depth. This design can prevent the groove 15 near the first battery casing 11 from not being filled with the injection molding material, thus ensuring the structural strength of the first connecting part 141.

[0073] Example 1, such as Figure 8As shown, the plurality of grooves 15 are composed of a plurality of first grooves 151, a plurality of second grooves 152 and a plurality of third grooves 153. The first grooves 151 are disposed close to the first battery housing 11, and the second grooves 152 are disposed away from the first battery housing 11. That is, the second grooves 152 are located outside the first grooves 151. The outside of the first grooves 151 refers to the side away from the receiving part. The third grooves 153 are located between the first grooves 151 and the second grooves 152. The depth of the first grooves 151 is less than the depth of the third grooves 153, and the depth of the third grooves 153 is less than the depth of the second grooves 152.

[0074] Preferably, such as Figure 8 As shown, in this Example 1, the depth h1 of the first groove 151 is any value between 20 micrometers and 40 micrometers.

[0075] For example, the depth h1 of the first groove 151 can be set to 20 micrometers, 25 micrometers, 30 micrometers, 35 micrometers or 40 micrometers.

[0076] Preferably, such as Figure 8 As shown, in this Example 1, the depth h3 of the third groove 153 is any value between 60 micrometers and 80 micrometers.

[0077] For example, the depth h3 of the third groove 153 can be set to 60 micrometers, 65 micrometers, 70 micrometers, 75 micrometers or 80 micrometers.

[0078] Preferably, such as Figure 8 As shown, in this Example 2, the depth h2 of the second groove 152 is any value between 100 micrometers and 120 micrometers.

[0079] For example, the depth h2 of the second groove 152 can be set to 100 micrometers, 105 micrometers, 110 micrometers, 115 micrometers or 120 micrometers.

[0080] Preferably, such as Figure 8 As shown, in this example 1, the area occupied by the plurality of first grooves 151 is less than or equal to the area occupied by the plurality of third grooves 153 and less than the area occupied by the plurality of second grooves 152.

[0081] For example, there are a total of 7 grooves 15, of which there are 2 first grooves 151, 2 third grooves 153, and 3 second grooves 152. The width L1 of the area occupied by the 2 first grooves 151 is 1.0 mm, the width L3 of the area occupied by the 2 third grooves 153 is 1.0 mm, and the width L2 of the area occupied by the 3 second grooves 152 is 1.5 mm.

[0082] It should be noted that, apart from the difference in depth, the width and groove spacing of the first groove 151, the second groove 152 and the third groove 153 are preferably set to be the same.

[0083] Preferably, such as Figure 7 and Figure 8 As shown, the groove spacing d between two adjacent grooves 15 is set to any value between 30 micrometers and 300 micrometers.

[0084] For example, the groove spacing d between two grooves 15 can be set to 30 micrometers, 50 micrometers, 100 micrometers, 150 micrometers, 200 micrometers, 250 micrometers or 300 micrometers. Among them, the groove spacing d between two adjacent grooves 15 is further preferably set to any value from 100 micrometers to 200 micrometers.

[0085] It should be noted that the groove spacing d between the two adjacent grooves 15 is in the width direction of the first connecting part 141. Figure 7 and Figure 8 In the left-right direction, the distance between the center lines of two adjacent grooves 15, such as Figure 7 and Figure 8 As shown in d.

[0086] Preferably, such as Figure 7 and Figure 8 As shown, the width w of the groove 15 is preferably any value between 20 micrometers and 200 micrometers.

[0087] For example, the width w of the groove 15 can be set to 20 micrometers, 50 micrometers, 80 micrometers, 100 micrometers, 120 micrometers, 150 micrometers, 180 micrometers or 200 micrometers. Among them, the width w of the groove 15 is further preferably set to any value from 50 micrometers to 120 micrometers.

[0088] By limiting the width of the first groove, it is possible to avoid the reduction in the number of first grooves due to excessive width, which would affect the bonding force between the plastic frame and the connecting part, and also to avoid the reduction in grooving efficiency and grooving rate due to excessive width.

[0089] It should be noted that when multiple grooves 15 are provided, it is preferable to set the width of the multiple grooves 15 to be the same.

[0090] Preferably, such as Figure 3 As shown, the ratio δ of the width L0 of the groove 15 region to the width L of the first connecting portion 141 is any value between 40% and 100%.

[0091] In other words, the width of the groove 15 area on the surface of the first connecting part 141 is at least 40% of the width of the first connecting part 141. This design can prevent the plastic frame 2 from falling off during battery use and improve the safety and reliability of the battery.

[0092] For example, the ratio δ can be set to 40%, 50%, 60%, 70%, 80%, 90%, or 100%. Among these, the ratio δ is further preferably set to any value between 70% and 100%.

[0093] For example, such as Figure 3 As shown, the width of the upper surface of the first connecting part 141 is L, and the width of the area where the groove 15 is provided on the upper surface of the first connecting part 141 is L0. The groove 15 on the upper surface of the first connecting part 141 extends along the length direction of the first connecting part 141 and penetrates the first connecting part 141. Then the ratio δ = 100% × (L0 / L). For example, if L0 = 3.0 mm and L = 4.0 mm, then the ratio δ = 100% × (3 / 4) = 75%.

[0094] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0095] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, 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 all fall within the protection scope of this utility model.

Claims

1. A battery casing, characterized in that, The battery casing includes a receiving portion and a connecting portion disposed in the receiving portion. The connecting portion has a groove surrounding the receiving portion. The depth of the groove is h, wherein 10 micrometers ≤ h ≤ 290 micrometers, and the width of the groove is w, wherein 20 micrometers ≤ w ≤ 200 micrometers.

2. The battery casing according to claim 1, characterized in that, 50 micrometers ≤ h ≤ 150 micrometers; and / or, 50 micrometers ≤ w ≤ 120 micrometers.

3. The battery casing according to claim 1, characterized in that, The grooves are multiple and spaced apart, and the groove spacing between two adjacent grooves is d, where 30 micrometers ≤ d ≤ 300 micrometers.

4. The battery casing according to claim 3, characterized in that, 100 micrometers ≤ d ≤ 200 micrometers.

5. The battery casing according to claim 3, characterized in that, The groove includes a first groove and a second groove disposed outside the first groove, wherein the depth of the second groove is greater than the depth of the first groove.

6. The battery casing according to claim 3, characterized in that, The multiple grooves are equidistantly distributed.

7. The battery casing according to claim 1, characterized in that, The width of the groove area is L0, and the width of the connecting part is L, wherein 40% ≤ L0 / L ≤ 100%.

8. The battery casing according to claim 1, characterized in that, The groove is annular and surrounds the receiving portion.

9. A battery, characterized in that, The battery includes a first battery housing, a second battery housing, and a plastic frame. The first battery housing and / or the second battery housing are battery housings as described in any one of claims 1 to 8. The plastic frame covers the outer end face of the connecting portion of the first battery housing and the connecting portion of the second battery housing, and the plastic frame is partially received in the groove.

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

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