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 technical problem that the combination force of the existing battery shell and injection molding plastic frame thereon is poor and sealing effect is not ideal.It is for this reason, the battery shell of the utility model includes accommodating portion and the connecting portion being set on accommodating portion, the surface of connecting portion is equipped with recess, recess is annular and is set around the accommodating portion.The utility model sets recess on connecting portion, can improve the contact area of plastic frame and connecting portion, to improve the combination force and sealing effect of plastic frame and battery shell, in addition, by making recess along the circumferential direction of accommodating portion and forming annular, both can further improve the combination force of plastic frame and battery shell, and can improve the sealing effect of battery shell.

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] Existing batteries typically use laser welding to connect and seal the casing. However, laser welding generally suffers from low yield rates, resulting in poor sealing of the battery casing. To improve the sealing performance, some batteries use injection molding to seal the casing. 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 connection, fixation, and seal at the battery casing joint. However, the flanges of existing batteries are usually smooth flat surfaces, and the bonding force between the plastic frame directly injection molded onto the flange and the casing is weak, resulting in poor sealing and affecting the stability of the battery structure and the safety of use.

[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 technical problems that the existing battery casing has poor bonding force with the plastic frame and unsatisfactory sealing effect when it is sealed by injection molding.

[0006] In a first aspect, the present invention provides a battery housing, including a receiving portion and a connecting portion disposed in the receiving portion, wherein the surface of the connecting portion is provided with a groove, the groove being annular and surrounding the receiving portion.

[0007] In the preferred embodiment of the battery casing described above, the ring is rectangular.

[0008] In the preferred embodiment of the battery casing described above, all four corners of the ring are rounded.

[0009] In the preferred embodiment of the battery casing described above, the grooves are provided in multiple and spaced apart.

[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 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.

[0012] In the preferred embodiment of the battery casing described above, the groove further includes a third groove, which is located between the first groove and the second groove, wherein the depth of the third groove is h3, and 60 micrometers ≤ h3 ≤ 80 micrometers.

[0013] In the preferred embodiment of the battery casing described above, the groove width 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; and / or, the width of the area where the groove is located is L0, and the width of the connecting part is L, wherein 40% ≤ L0 / L ≤ 100%.

[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, the edge of the partition being located between the connecting portion of the first battery casing and the connecting portion of the second battery casing, and the plastic frame covering the connecting portion of the first battery casing, the edge of the partition, and the outer end face of the connecting portion of the second battery casing.

[0016] With the above technical solution, the connecting part of the battery casing of this utility model is provided with a groove, which can significantly increase the contact area between the plastic frame and the connecting part, and improve the bonding force and sealing effect between the plastic frame and the battery casing. This helps to prevent the plastic frame from falling off and reduces or even eliminates the risk of the plastic frame falling off. In addition, by making the groove form a ring around the circumference of the receiving part, the bonding force between the plastic frame and the battery casing can be further improved, and the sealing effect of the battery casing can also be improved.

[0017] Furthermore, this invention sets the four corners of the annular shape formed by the groove to rounded corners, which is beneficial for the processing of the groove and for the injection molding material to flow along the groove, thereby completely filling the annular groove.

[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 utility model can avoid the situation where the groove near the receiving part cannot be filled by the injection molding material, which is beneficial to ensuring the structural strength of the connection part.

[0019] Furthermore, by limiting the width and spacing of the grooves, this utility model makes the layout of the grooves more reasonable, which facilitates increasing the number of grooves. At the same time, it helps to improve the bonding force and sealing effect between the plastic frame and the battery casing, preventing the plastic frame from falling off.

[0020] Furthermore, the battery provided by this utility model, based on the above technical solution, includes the aforementioned battery casing, and thus possesses the technical effects of the aforementioned battery casing. Compared with the battery before the improvement, the battery of this utility model has better sealing performance and higher safety. Attached Figure Description

[0021] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0022] Figure 1 This is an exploded schematic diagram of the battery of this utility model;

[0023] Figure 2 This is an assembly diagram of the battery of this utility model;

[0024] Figure 3 yes Figure 2 Sectional view at point AA;

[0025] Figure 4 This is a schematic diagram of the structure of the first embodiment of the battery casing of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the second embodiment of the battery casing of this utility model;

[0027] Figure 6 This is a structural schematic diagram of the third embodiment of the battery casing of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the first embodiment of the first connecting part of this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the second embodiment of the first connecting part of this utility model.

[0030] List of reference numerals in the attached diagram:

[0031] 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;

[0032] 2. Plastic frame. Detailed Implementation

[0033] 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.

[0034] 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 "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] 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.

[0036] This utility model provides a novel battery housing, which includes a receiving portion and a connecting portion 14 disposed on the receiving portion. The connecting portion 14 is the aforementioned flange. The receiving portion is the part in the middle of the battery housing that accommodates the battery cell, and its interior forms a cavity for accommodating the battery cell.

[0037] 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.

[0038] like Figures 1 to 3 As shown, the connecting portion 14 is disposed around the receiving portion, that is, the connecting portion 14 is disposed in a circle around the circumference of the receiving portion. Preferably, the receiving portion generally has an opening for inserting or removing the battery cell, and the connecting portion 14 is formed extending from the edge of the opening in a direction away from the receiving portion.

[0039] 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.

[0040] 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.

[0041] In preferred example 1, such as Figures 1 to 3 As shown, the housing assembly 1 of this utility model includes a partition 13, which is located in the thickness direction ( Figure 1 and Figure 3 The batteries are disposed on both sides of the separator 13 (vertical direction). For ease of description and understanding, the battery casings on both sides of the separator 13 are respectively named the first battery casing 11 and the second battery casing 12. The connecting part on the first battery casing 11 is called the first connecting part 141, and the connecting part on the second battery casing 12 is called the second connecting part 142. The first connecting part 141, the edge of the separator 13, and the second connecting part 142 are superimposed on each other.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] For example, such as Figures 1 to 3 As 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] It should be noted that those skilled in the art can set the groove 15 to be cylindrical, square, or strip-shaped, etc., in practical applications. Such adjustments and changes to the specific shape of the groove 15 do not deviate from the principle and scope of this utility model and should be limited to the protection scope of this utility model.

[0052] Preferably, such as Figures 4 to 6 As shown, groove 15 is strip-shaped.

[0053] 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 between the plastic frame 2 and the housing assembly 1.

[0054] 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.

[0055] 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.

[0056] Preferably, such as Figures 4 to 6 As shown, the groove 15 forms a ring around the circumference of the first battery casing 11.

[0057] 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.

[0058] In the first preferred case, such as Figure 4 As shown, the groove 15 extends through the first connecting portion 141 along its length.

[0059] For example, such as Figure 4As 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.

[0060] like Figure 4 As 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.

[0061] 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.

[0062] 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, with the length of the annular grooves gradually increasing along 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, such as Figure 6 As shown, the ring formed by the groove 15 is rectangular, and all four corners of the ring are rounded.

[0064] 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.

[0065] like Figure 6As 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 connecting portion 14. Furthermore, the multiple grooves 15 are preferably distributed at equal intervals.

[0066] Preferably, such as Figure 7 and 8 As shown, the depth of groove 15 is any value between 10 micrometers and 290 micrometers.

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

[0068] It should be noted that the depth 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 shallow depth of the groove 15, and to avoid affecting the structural strength of the first connecting part 141 due to the excessive depth of the groove 15. The depth of the groove 15 is further preferably any value between 50 micrometers and 150 micrometers.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Of course, in this first preferred example, such as Figures 4 to 6 As shown, the groove 15 is preferably set as a strip and extends along the length direction of the first connecting portion 141, and the plurality of grooves 15 are distributed at intervals along the width direction of the first connecting portion 141.

[0073] In the second preferred example, such as Figure 8As 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.

[0074] 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, which helps to ensure the structural strength of the first connecting part 141.

[0075] Example 1, such as Figure 8 As 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.

[0076] 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.

[0077] For example, the depth h1 of the first groove can be set to 20 micrometers, 25 micrometers, 30 micrometers, 35 micrometers or 40 micrometers.

[0078] Preferably, such as Figure 8 As shown, in this Example 1, the depth of the third groove 153 is any value between 60 micrometers and 80 micrometers.

[0079] For example, the depth h3 of the third groove can be set to 60 micrometers, 65 micrometers, 70 micrometers, 75 micrometers or 80 micrometers.

[0080] Preferably, such as Figure 8 As shown, in this Example 1, the depth of the second groove is any value between 100 micrometers and 120 micrometers.

[0081] For example, the depth h2 of the second groove can be set to 100 micrometers, 105 micrometers, 110 micrometers, 115 micrometers or 120 micrometers.

[0082] Preferably, such as Figure 8 As shown, in this example 2, the width of the region of the plurality of first grooves 151 is L1, the width of the region of the plurality of second grooves 152 is L2, and the width of the region of the plurality of third grooves 153 is L3, wherein L1≤L3<L2.

[0083] 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.

[0084] 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.

[0085] Example 2 is largely the same as Example 1, except that it lacks 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.

[0086] 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.

[0087] 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.

[0088] 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 In the left-right direction (as shown in the diagram), the distance between the center lines of two adjacent grooves 15 is, for example... Figure 7 As shown in d in the figure.

[0089] 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.

[0090] 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. Preferably, the width w of the groove 15 is set to any value between 50 micrometers and 120 micrometers. 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 excessively narrow width.

[0091] 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.

[0092] Preferably, such as Figure 3 As shown, the ratio δ of the width L0 of the area where the groove 15 is located to the width L of the first connecting portion 141 is any value between 40% and 100%.

[0093] 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.

[0094] 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%.

[0095] 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.

[0096] 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, It includes a receiving portion and a connecting portion disposed in the receiving portion. The surface of the connecting portion is provided with a groove, which is annular and surrounds the receiving portion.

2. The battery casing according to claim 1, characterized in that, The ring is rectangular.

3. The battery casing according to claim 2, characterized in that, The four corners of the ring are all rounded.

4. The battery casing according to claim 1, characterized in that, The grooves are provided in multiple and spaced apart.

5. The battery casing according to claim 4, 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 5, 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, where 100 micrometers ≤ h2 ≤ 120 micrometers.

7. The battery casing according to claim 6, characterized in that, The groove further includes a third groove, which is located between the first groove and the second groove, wherein the depth of the third groove is h3, and 60 micrometers ≤ h3 ≤ 80 micrometers.

8. The battery casing according to claim 4, characterized in that, The groove width is w, where 20 micrometers ≤ w ≤ 200 micrometers; and / or, The spacing between two adjacent grooves is d, where 30 micrometers ≤ d ≤ 300 micrometers; and / or, The width of the area where the groove is located is L0, and the width of the connecting part is L, wherein 40%≤L0 / L≤100%.

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, the edge of the partition being located between the connecting portion of the first battery housing and the connecting portion of the second battery housing, and the plastic frame covering the connecting portion of the first battery housing, the edge of the partition, and the outer end face of the connecting portion of the second battery housing.

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