Battery

Abstract

The invention relates to the technical field of automobiles, particularly provides a battery, and aims to solve the problem that a battery shell of an existing power battery is prone to quality defects in the welding process. In order to achieve the purpose, the battery comprises a shell and a plastic frame, the shell comprises a first shell body and a second shell body, the first shell body is provided with a first connecting part, the second shell body is provided with a second connecting part, and the plastic frame is formed on the first connecting part and the second connecting part in an injection molding mode and wraps the outer end face of the first connecting part and the outer end face of the second connecting part. According to the battery provided by the invention, the outer end surfaces of the first connecting part and the second connecting part are coated with the plastic frames, so that the problem that the connecting and sealing effects of the shell of the power battery are not ideal is solved, and the safety of an electric automobile is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and specifically provides a battery. Background Art

[0002] With the continuous popularization of electric vehicles, people have higher and higher requirements for the safety of electric vehicles, and the sealing performance of power batteries is one of the key factors affecting the safety of electric vehicles.

[0003] Existing power batteries usually include structures such as a housing and battery cells inside the housing. The housing includes structures such as a first housing and a second housing (or a cover plate). The first housing and the second housing are fitted and welded through a flange to form a cavity for accommodating the battery cells inside. However, when the existing first housing and second housing are welded, effective alignment between the first housing and the second housing cannot be achieved, increasing the difficulty of the process; moreover, the structural stability and sealing performance of the welded first housing and second housing are poor, easily leading to leakage of the internal electrolyte, thereby affecting the safety of the battery.

[0004] Correspondingly, a new battery is needed in this field to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problems of easy quality defects and poor sealing in the welding process of the battery housing of existing power batteries.

[0006] In a first aspect, the present invention provides a battery, including an outer shell and a plastic frame. The outer shell includes a first housing and a second housing. The first housing is provided with a first connecting portion, and the second housing is provided with a second connecting portion. The plastic frame is injection-molded on the first connecting portion and the second connecting portion, and the plastic frame covers the outer end faces of the first connecting portion and the second connecting portion.

[0007] For the battery provided by the present invention, by injection-molding a plastic frame on the first connecting portion and the second connecting portion, the outer end faces of the first connecting portion and the second connecting portion are covered by the plastic frame, realizing the connection and sealing of the first housing and the second housing. Compared with traditional welding, the first connecting portion and the second connecting portion constructed by the battery of the present invention can achieve their connection and sealing through the restraint of the plastic frame. On the basis of ensuring better connection strength between the first housing and the second housing, the influence of factors such as the alignment degree and flatness of the connecting portion on the processing technology is reduced, effectively improving the safety of the battery. In addition, the sealing difficulty of the battery is reduced, the production efficiency is effectively improved, and the production cost is reduced.

[0008] It should be noted that both the first housing and the second housing can be in the shape of a cover shell, or one of the first housing and the second housing can be in the shape of a cover shell, and the other can be in the shape of a plate.

[0009] In some feasible embodiments of the above battery, the first connecting portion is provided with a first groove, and a part of the plastic frame is received in the first groove; and / or, the second connecting portion is provided with a first groove, and a part of the plastic frame is received in the first groove.

[0010] In this way, by providing the first groove on the first connecting portion and / or the second connecting portion, when the plastic frame is injection-molded on the first connecting portion and the second connecting portion, the bonding force between the plastic frame and the first connecting portion and the second connecting portion is stronger, and the sealing effect is better, ensuring the connection stability and sealing performance of the plastic frame to the first connecting portion and the second connecting portion.

[0011] In some feasible embodiments of the above battery, the housing further includes a partition disposed between the first housing and the second housing, and the plastic frame covers the outer end surface of the partition.

[0012] By providing a partition between the first housing and the second housing, closed cavities can be respectively formed between the first housing and the partition and between the second housing and the partition to respectively accommodate the battery cells, which can not only increase the battery capacity, but also improve the space utilization rate and energy density to meet the demand for high endurance.

[0013] In some feasible embodiments of the above battery, the partition is provided with a second groove, and a part of the plastic frame is received in the second groove.

[0014] By providing the second groove on the partition, on the one hand, part of the plastic frame can be received in the second groove to strengthen the bonding force between the plastic frame and the partition, and on the other hand, the sealing effect between the plastic frame and the partition can be improved to prevent electrolyte leakage and improve the stability and safety of the battery structure.

[0015] In some feasible embodiments of the above battery, the groove width of the first groove and the second groove is w, where 20 μm ≤ w ≤ 200 μm; and / or, the depth of the first groove and the second groove is h, where 10 μm ≤ h ≤ 290 μm.

[0016] By defining the parameters of the first groove as above, on the one hand, the bonding force and sealing effect between the plastic frame and the first housing, the second housing or the partition can be enhanced, and on the other hand, it can be formed by laser processing on the first connecting portion, the second connecting portion or the partition, which not only reduces the process difficulty but also saves costs, and is lower in cost and simpler in process than the method of forming microgrooves by chemical liquid treatment.

[0017] In some feasible embodiments of the above battery, the first groove is annular and disposed around the first housing; and / or, the first groove is annular and disposed around the second housing.

[0018] By setting the first groove to be annular, on the one hand, it can ensure that the molten plastic flows into and fills the first groove, and on the other hand, it can enhance the bonding force and sealing effect between the plastic frame and the first connecting part or the second connecting part.

[0019] In some feasible embodiments of the above battery, the battery includes a first through hole that penetrates the first connecting part, the separator, and the second connecting part, and part of the plastic frame is received in the first through hole.

[0020] In this way, part of the plastic frame can be received in the first through hole, thereby enhancing the bonding strength between the plastic frame and the first connecting part, the separator, and the second connecting part, effectively preventing the separation of the first connecting part, the separator, and the second connecting part, and ensuring the overall structural strength and safety of the battery.

[0021] In some feasible embodiments of the above battery, the first housing includes a side wall, and the included angle between the first connecting part and the side wall is 15° to 85°; and / or, the second housing includes a side wall, and the included angle between the second connecting part and the side wall is 15° to 85°.

[0022] In this way, through the inclined design of the first connecting part, the plastic frame injection-molded on the first connecting part and the second connecting part strengthens the overall structural strength of the battery, prevents its relative movement with the first housing and the second housing, and has a more ideal sealing effect.

[0023] In some feasible embodiments of the above battery, there is a gap between the first connecting part and the separator, and part of the plastic frame is received in the gap; and / or, there is a gap between the second connecting part and the separator, and part of the plastic frame is received in the gap.

[0024] In the case of adopting the above technical solution, not only can the bonding force between the plastic frame and the first connecting part, the separator, and the second connecting part be increased, but also the leakage of the electrolyte at the gap can be effectively prevented, and the sealing and safety are higher.

[0025] In some feasible embodiments of the above battery, the plastic frame is provided with a second through hole.

[0026] In this way, the weight of the plastic frame can be effectively reduced, thereby reducing the overall mass of the battery, and the cost can be reduced, which is convenient for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings, in which:

[0028] Figure 1It is an exploded view of the battery provided by an embodiment of the present invention;

[0029] Figure 2 It is a top view of the battery provided by an embodiment of the present invention;

[0030] Figure 3 It is Figure 2 a sectional view taken along line A-A in

[0031] Figure 4 It is a sectional view of the first connection part provided by an embodiment of the present invention;

[0032] Figure 5 It is a top view of the first embodiment of the first housing provided by the present invention;

[0033] Figure 6 It is a top view of the second embodiment of the first housing provided by the present invention;

[0034] Figure 7 It is a top view of the third embodiment of the first housing provided by the present invention;

[0035] Figure 8 It is a three-dimensional view of the battery without a plastic frame provided by an embodiment of the present invention;

[0036] Figure 9 It is a sectional view of the battery provided by another embodiment of the present invention;

[0037] Figure 10 It is a sectional view of the battery without a plastic frame provided by still another embodiment of the present invention;

[0038] Figure 11 It is a sectional view of the battery provided by still another embodiment of the present invention;

[0039] Figure 12 It is a three-dimensional view of the plastic frame provided by an embodiment of the present invention.

[0040] List of reference numerals:

[0041] 1. Outer shell; 11. First housing; 12. Second housing; 13. Partition; 131. Second groove; 14. Connection part; 141. First connection part; 142. Second connection part; 15. First groove; 16. Gap; 171. First through hole; 17. Bottom wall; 18. Side wall; 2. Plastic frame; 21. Second through hole. Detailed implementation manners

[0042] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios. For example, although the following embodiments are described by taking pure electric vehicles as an example, the technical solutions of the present invention are also applicable to other types of vehicles such as hybrid vehicles.

[0043] To better illustrate the present invention, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some specific details.

[0044] In the description of the present invention, the terms "upper", "lower", "inner", "outer", "top", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships in actual applications. This is only for convenience of description and does not indicate or imply that the device to be protected must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] The vehicle provided by the embodiment of the present invention is a pure electric vehicle, which is configured with a battery pack, and the battery pack provides power for the vehicle operation. A plurality of battery modules are arranged in the battery pack, and the plurality of battery modules are jointly controlled and managed by a battery management system and a thermal management system to form a battery pack. The battery module includes a plurality of batteries and a housing frame, and the plurality of batteries are encapsulated together by the housing frame and are in contact with the outside through a unified boundary. The battery module is an intermediate energy storage unit between the battery (battery cell) and the battery pack.

[0047] Refer to Figures 1-12 , for the introduction of the battery of the present application.

[0048] The battery includes a housing 1 and a plastic frame 2. The housing 1 includes a thickness direction ( Figure 1The first housing 11, the partition 13, and the second housing 12 are arranged in the up-down direction (i.e., the direction perpendicular to the surface with the largest area of the housing 1). The first housing 11 is provided with a first connecting portion 141, and the second housing 12 is provided with a second connecting portion 142. The partition 13 is disposed between the first housing 11 and the second housing 12, and the edge of the partition 13 is clamped between the first connecting portion 141 and the second connecting portion 142. The plastic frame 2 is injection-molded on the first connecting portion 141, the edge of the partition 13, and the second connecting portion 142. The plastic frame 2 covers the first connecting portion 141, the edge of the partition 13, and the outer end surface of the second connecting portion 142.

[0049] Furthermore, the plastic frame 2 is disposed around the housing 1. Preferably, the plastic frame 2 is annular and surrounds the housing 1 in a circle, so as to achieve a complete seal between the first connecting portion 141 and the second connecting portion 142, and the fixing effect is more remarkable. Similarly, the first connecting portion 141 and the second connecting portion 142 respectively surround the first housing 11 and the second housing 12 in a circle, which not only helps to improve the structural stability, but also facilitates the formation of a plastic frame 2 in a circle.

[0050] When injection-molding the plastic frame 2, the first connecting portion 141, the edge of the partition 13, and the second connecting portion 142 are sequentially stacked together, and then the outer end surfaces of the first connecting portion 141, the edge of the partition 13, and the second connecting portion 142 are injection-molded to form the plastic frame 2, so that the formed plastic frame 2 covers the first connecting portion 141, the edge of the partition 13, and the outer end surface of the second connecting portion 142, realizing the connection and fixation and sealing of the housing 1.

[0051] It should be noted that the present application does not limit the connection manners of the first connecting portion 141 with the first housing 11 and the second connecting portion 142 with the second housing 12, as long as the first connecting portion 141 can be disposed on the first housing 11 and the second connecting portion 142 can be disposed on the second housing 12. For example, the first connecting portion 141 and the first housing 11 are integrally formed, and / or the second connecting portion 142 and the second housing 12 are integrally formed. In addition, the present application does not limit the materials and thicknesses of the first housing 11, the first connecting portion 141, the second housing 12, the second connecting portion 142, the partition 13, and the plastic frame 2, as long as the housing 1 has good sealing performance. For example, the materials of the first housing 11, the first connecting portion 141, the second housing 12, the second connecting portion 142, and the partition 13 can be aluminum alloy, and / or the material of the plastic frame 2 can be plastic, and / or the thicknesses are all 0.3 mm.

[0052] The battery further includes a first battery cell (not shown) and a second battery cell (not shown). The first battery cell is electrically connected to the second battery cell. The first battery cell is received in a first cavity formed between the first housing 11 and the partition 13, and the second battery cell is received in a second cavity formed between the second housing 12 and the partition 13. The first cavity and the second cavity are relatively independent and sealed, which can effectively prevent the electrolyte in the first cavity and the second cavity from communicating with each other.

[0053] Further, a conductive member (not shown) is provided on the partition 13. The conductive member is insulated and sealedly connected to the partition 13. The conductive member penetrates through the upper and lower surfaces of the partition 13. One end of the conductive member is electrically connected to the first battery cell in the first cavity, and the other end of the conductive member is electrically connected to the second battery cell in the second cavity, thereby realizing the electrical connection between the first battery cell and the second battery cell, such as in series or in parallel, etc.

[0054] Further, the first housing 11 may be provided with a first terminal (not shown), and the second housing 12 may be provided with a second terminal (not shown). The first terminal is electrically connected to the first battery cell, and the second terminal is electrically connected to the second battery cell. The first terminal and the second terminal are used to output the electrical energy of the battery to an external electrical device.

[0055] In other embodiments, the partition 13 may be omitted, that is, the outer shell 1 only includes the first housing 11 and the second housing 12, and the remaining structures are the same as those in the above embodiments and will not be described herein again.

[0056] In addition, it should be noted that the battery structure of the present invention is not limited to the form composed of "the first housing 11 + the second housing 12" and "the first housing 11 + the partition 13 + the second housing 12". Without departing from the basic principle of the present invention, those skilled in the art can adopt batteries with other structures.

[0057] Further, the first connecting portion 141 is provided with a first groove 15, and a part of the plastic frame 2 is received in the first groove 15; and / or, the second connecting portion 142 is provided with a first groove 15, and a part of the plastic frame 2 is received in the first groove 15. Preferably, the first groove 15 is arranged around the first housing 11 and / or the second housing 12 and is in a closed ring shape.

[0058] By providing the first groove 15 on the first connecting portion 141 and the second connecting portion 142, during the injection molding process of the plastic frame 2, the molten injection slurry will penetrate into the first groove 15, thereby improving the bonding force and sealing effect between the plastic frame 2 and the first connecting portion 141 and / or the second connecting portion 142.

[0059] It should be noted that those skilled in the art can, in practical applications, set the first groove 15 only on the first connecting portion 141, or alternatively, can also set the first groove 15 only on the second connecting portion 142. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should all be defined within the protection scope of the present invention. Of course, preferably, the housing 1 of the present invention is provided with the first groove 15 on both the first connecting portion 141 and the second connecting portion 142.

[0060] It should be noted that those skilled in the art can, in practical applications, set the first groove 15 to be cylindrical, square, strip-shaped, etc. Such adjustments and changes to the specific shape of the first groove 15 do not deviate from the principle and scope of the present invention and should all be defined within the protection scope of the present invention.

[0061] Preferably, as Figures 4 to 6 shown, the first groove 15 is strip-shaped.

[0062] By setting the first groove 15 to be strip-shaped, it is not only convenient for the processing of the first groove 15, but also can increase the contact area between the plastic frame 2 and the housing 1, thereby improving the bonding force and sealing effect between the plastic frame 2 and the housing 1.

[0063] It should be noted that the following takes the first groove 15 on the first connecting portion 141 as an example for illustration. Similarly, the first groove 15 on the second connecting portion 142 also satisfies the description of the following content.

[0064] It should be noted that those skilled in the art can, in practical applications, make the first groove 15 extend along the length direction of the first connecting portion 141, or alternatively, can also make the first groove 15 extend along the width direction of the first connecting portion 141, or further, can also make the first groove 15 extend obliquely, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should all be defined within the protection scope of the present invention.

[0065] Preferably, as Figures 5 to 7 shown, the first groove 15 forms a ring along the circumferential direction of the first housing 11.

[0066] By making the first groove 15 form a closed ring along the circumferential direction of the first housing 11, a closed annular path is formed, which can not only improve the bonding force between the plastic frame 2 and the first housing 11, but also improve the sealing effect of the first housing 11.

[0067] In the first preferred case, as Figure 5 shown, the first groove 15 penetrates the first connecting portion 14 along the length direction of the first connecting portion 14.

[0068] Exemplarily, as Figure 5As shown, the first groove 15 on the long side of the first connecting portion 141 penetrates the long side of the first connecting portion 141 along the length direction of the long side of the first connecting portion 141, and the first groove 15 on the short side of the first connecting portion 141 penetrates the short side of the first connecting portion 141 along the length direction of the short side of the first connecting portion 141. In this way, both ends of the first groove 15 located on the long side of the first connecting portion 141 communicate with the first grooves 15 on the corresponding short sides of the first connecting portion 141 respectively, and both ends of the first groove 15 located on the short side of the first connecting portion 141 communicate with the first grooves 15 on the corresponding long sides of the first connecting portion 141 respectively, so that the first groove 15 forms a ring along the circumferential direction of the housing 1.

[0069] As Figure 5 shown, in this preferred case, the number of the first grooves 15 is preferably set to be multiple, and the multiple first grooves 15 are spaced apart along the width direction of the first connecting portion 141. Among them, each first 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 first grooves 15 on the long side of the first connecting portion 141 intersect with the first grooves 15 on the short side of the first connecting portion 141, having an overlapping area. The multiple first grooves 15 are preferably equally spaced.

[0070] In the second preferred case, as Figure 6 shown, the ring formed by the first groove 15 is rectangular. That is to say, the first grooves 15 on the long side of the first connecting portion 141 and the first grooves 15 on the short side of the first connecting portion 141 are connected end to end to form a rectangular closed path.

[0071] As Figure 6 shown, in this preferred case, the number of the first grooves 15 is also preferably set to be multiple, and the multiple first grooves 15 are spaced apart along the width direction of the first connecting portion 141. That is to say, a plurality of rectangular ring grooves are provided on the first connecting portion 141, and the plurality of ring grooves are arranged in an array. Along the direction away from the first housing 11 (i.e., from the inside to the outside), the length of the ring groove gradually increases. The multiple first grooves 15 are preferably equally spaced.

[0072] In the third preferred case, as Figure 7 shown, the ring formed by the first groove 15 is rectangular, and the four corners of the ring are all provided with rounded corners.

[0073] By setting the four corners of the ring formed by the first groove 15 to be rounded corners, it is beneficial to both the processing of the first groove 15 and the flow of the injection molding material along the first groove 15, so as to completely fill the entire ring-shaped first groove 15.

[0074] As Figure 7As shown, in this preferred case, the number of the first grooves 15 is also preferably set to be multiple, and the multiple first grooves 15 are spaced apart along the direction away from the first housing 11. Moreover, the multiple first grooves 15 are preferably equally spaced.

[0075] Preferably, as Figure 10 and 11 shown, the partition 13 is provided with second grooves 131 for accommodating injection molding materials at positions corresponding to the first connecting portion 141 and the second connecting portion 142.

[0076] By providing the second grooves 131 on the partition 13, the connection area between the plastic frame 2 and the housing 1 can be increased, thereby improving the connection stability between the plastic frame 2 and the housing 1.

[0077] It should be noted that those skilled in the art can, in actual applications, provide the second grooves 131 only at the positions corresponding to the first connecting portion 141 of the partition 13, or can also provide the second grooves 131 only at the positions corresponding to the second connecting portion 142 of the partition 13. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should all be defined within the protection scope of the present invention. Of course, it is preferred to provide the second grooves 131 at the positions corresponding to both the first connecting portion 141 and the second connecting portion 142 of the partition 13.

[0078] It should be noted that those skilled in the art can, in actual applications, set the second grooves 131 to be cylindrical, square, strip-shaped, etc. Such adjustments and changes to the specific shape of the second grooves 131 also do not deviate from the principles and scope of the present invention and should all be defined within the protection scope of the present invention.

[0079] Preferably, the second groove 131 is a closed ring formed around the edge of the partition 13, or other shapes, etc., which are not specifically limited herein. When the second groove 131 is provided in a ring shape, the connection strength and sealing effect between the plastic frame 2 and the partition 13 can be significantly enhanced, ensuring the stability and safety of the battery structure.

[0080] Preferably, as Figure 4 shown, the depth h of the first groove 15 is any value from 10 micrometers to 290 micrometers.

[0081] Exemplarily, those skilled in the art can, in actual applications, set the depth h of the first groove 15 to be 10μm, 50μm, 100μm, 150μm, 200μm, 250μm or 290μm.

[0082] Furthermore, the depth h of the first groove 15 refers to the dimension of the first groove 15 along the thickness direction of the first connecting portion 141. By limiting the depth of the first groove 15, it can not only avoid the influence on the bonding force between the plastic frame 2 and the first housing 11 due to the too shallow depth of the first groove 15, but also avoid the influence on the structural strength of the first connecting portion 141 due to the too deep depth of the first groove 15. Among them, the depth h of the first groove 15 is further preferably any value between 50 μm and 150 μm.

[0083] In the first preferred example, as Figure 4 shown, the number of the first grooves 15 is set to be multiple. Among them, the depths h of the multiple first grooves 15 are all the same. The depth h of the first groove 15 is preferably any value between 10 μm and 290 μm, and further preferably any value between 50 μm and 150 μm.

[0084] Exemplarily, as Figure 4 shown, the multiple first grooves 15 are spaced apart in a direction away from the first housing 11, and the multiple first grooves 15 are equally spaced.

[0085] It should be noted that in practical applications, those skilled in the art can also make the multiple first grooves 15 spaced apart along the length direction of the connection. Such flexible adjustment and change do not deviate from the principle and scope of the present invention, and should all be defined within the protection scope of the present invention.

[0086] Preferably, as Figure 4 shown, the groove spacing d between two adjacent first grooves 15 is set to be any value between 30 μm and 300 μm.

[0087] Exemplarily, the groove spacing d between two first grooves 15 can be set to 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm. Among them, the groove spacing d between two adjacent grooves 15 is further preferably set to any value between 100 μm and 200 μm.

[0088] It should be pointed out that the groove spacing d between two adjacent first grooves 15 above is the distance between the center lines of two adjacent first grooves 15 in the width direction ( Figure 4 the left - right direction in Figure 4 ), as shown by d in

[0089] Preferably, as Figure 4 shown, the width w of the first groove 15 is preferably any value between 20 μm and 200 μm.

[0090] Exemplarily, the width w of the first groove 15 can be set to 20μm, 50μm, 80μm, 100μm, 120μm, 150μm, 180μm or 200μm. Among them, the width w of the first groove 15 is further preferably set to any value between 50μm and 120μm.

[0091] By limiting the width of the first groove 15, it can avoid the reduction of the number of the first grooves 15 due to the too wide width of the first groove 15, thereby affecting the bonding force between the plastic frame 2 and the connecting portion, and can also avoid the grooving efficiency and the groove forming rate due to the too narrow width of the first groove 15. And the above limitations on the groove depth, groove width, etc. of the first groove 15 can be formed by adopting a laser processing method, which can not only improve the processing efficiency, but also significantly reduce the processing cost.

[0092] Similarly, the groove width, groove depth and groove pitch of the second groove 131 also satisfy the above range limitations, which will not be elaborated here.

[0093] As Figure 8 shown, the battery further includes a through hole 171, and the through hole 171 penetrates through the upper and lower surfaces of the first connecting portion 141, the edge of the partition 13 and the second connecting portion 142. Thus, when the plastic frame 2 is injection-molded, the molten plastic can flow into the through hole 171, thereby enhancing the connection strength between the plastic frame 2 and the housing 1, ensuring the structural stability of the battery, and preventing the first connecting portion 141, the partition 13 and the second connecting portion 142 from detaching.

[0094] In order to enhance the connection strength between the plastic frame 2 and the housing 1, multiple through holes 171 can be provided and distributed at intervals around the circumference of the housing 1. A certain distance is maintained between the through holes 171, increasing the connection strength between the first connecting portion 141, the edge of the partition 13, the second connecting portion 142 and the plastic frame 2 along the entire circumference, and improving the sealing performance of the battery in all directions. Preferably, the adjacent through holes 171 are arranged at equal distances.

[0095] It should be noted that Figure 8 the number and arrangement of the through holes 17 shown in

[0096] are not limitations to this application. Without departing from the basic principle of this application, those skilled in the art can adjust the number and arrangement of the through holes 171, which does not deviate from the principle of the present invention. Therefore, all will fall within the protection scope of this application. Preferably, the through hole 171 is strip-shaped. The strip-shaped through hole 171 has a larger contact area and contact strength, enabling more injection molding materials to be accommodated in the through hole 171, improving the connection strength between the first connecting portion 141, the second connecting portion 142 and the plastic frame 2. The structure of the strip-shaped through hole 171 is easier to design and process, and provides sufficient space while maintaining the structural strength.

[0097] Both ends of the long strip hole are arc-shaped, and it is not easy to have the phenomenon of stress concentration, which can avoid the damage of the first connecting portion 141 and the second connecting portion 142 caused by stress concentration; and the long strip hole is more variable and adjustable than the circular hole, and it is easier to adapt to different manufacturing and assembly requirements.

[0098] It should be noted that those skilled in the art can set the through hole 171 as a circular hole, a square hole, etc. in actual applications. Such adjustments and changes to the specific shape of the through hole 171 do not deviate from the scope and scope of this application, and should all be limited within the protection scope of this application. Of course, this application preferably uses a long strip hole for the through hole 171.

[0099] As Figure 9 As shown, both the first housing 11 and the second housing 12 include a bottom wall 17 and a side wall 18 arranged around the bottom wall 17. Preferably, the bottom wall 17 and the side wall 18 are integrally provided. The first connecting portion 141 is provided on the side wall 18 of the first housing 11, and the second connecting portion 142 is provided on the side wall 18 of the second housing 12.

[0100] For the convenience of description, the first housing 11 will be taken as an example for description below. Similarly, the second housing 12 also includes the technical features described below.

[0101] The first connecting portion 141 is inclined relative to the side wall 18, and the included angle θ between the first connecting portion 141 and the side wall 18 is 15° to 85°. Similarly, the included angle θ between the second connecting portion 142 and the side wall 18 is 15° to 85°. Specifically, θ can be 5°, 10°, 20°, 30°, 50° or 75°, so as to prevent the insufficient bonding force between the first connecting portion 141 and the second connecting portion 142 and the plastic frame 2 caused by too large θ, and at the same time prevent the poor sealing effect caused by too small θ and the interference between the free ends of the first connecting portion 141 and the second connecting portion 142 and the pole column.

[0102] By designing the first connecting portion 141 and the second connecting portion 142 to be inclined, on the one hand, a gap can be formed between the first connecting portion 141 and the second connecting portion 142, and a part of the plastic frame 2 is filled in the gap, which can improve the sealing effect between the first housing 11 and the second housing 12. On the other hand, the bonding force between the first housing 11 and the second housing 12 and the plastic frame 2 can be improved, and the situation that the plastic frame 2 shakes or falls off relative to the first housing 11 and the second housing 12 during the use of the battery can be avoided.

[0103] Furthermore, as Figure 10 and 11As shown, a gap 16 is provided between the first connecting portion 141 and the partition 13, and a gap 16 is also present between the second connecting portion 142 and the partition 13. A part of the plastic frame 2 is received in the gap 16.

[0104] The provision of the above-mentioned gap 16 increases the contact area between the first connecting portion 141, the partition 13, the second connecting portion 142 and the plastic frame 2, and improves the connection strength and sealing performance between the housing 1 and the plastic frame 2.

[0105] As Figure 12 shown, the plastic frame 2 is provided with second through-holes 21. Multiple second through-holes 21 can be provided and arranged in sequence. The second through-holes 21 penetrate the inner and outer surfaces of the plastic frame 2. On the one hand, it can reduce the use of plastic and lower the cost. On the other hand, it can reduce the weight and lower the weight of the battery.

[0106] The shape and arrangement of the second through-holes 21 can be set as needed and will not be elaborated here.

[0107] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the 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, characterized in that, It includes a housing and a plastic frame. The housing includes a first shell and a second shell. The first shell is provided with a first connecting portion, and the second shell is provided with a second connecting portion. The plastic frame is injection-molded on the first connecting portion and the second connecting portion, and the plastic frame covers the outer end faces of the first connecting portion and the second connecting portion.

2. The battery according to claim 1, characterized in that, The first connecting portion is provided with a first groove, and part of the plastic frame is received in the first groove; and / or, The second connecting portion is provided with a first groove, and part of the plastic frame is received in the first groove.

3. The battery according to claim 2, characterized in that, The housing further includes a partition disposed between the first shell and the second shell, and the plastic frame covers the outer end face of the partition.

4. The battery according to claim 3, characterized in that, The partition is provided with a second groove, and part of the plastic frame is received in the second groove.

5. The battery according to claim 4, characterized in that, The groove width of the first groove and the second groove is w, where 20 microns ≤ w ≤ 200 microns; and / or, The depth of the first groove and the second groove is h, where 10 microns ≤ h ≤ 290 microns.

6. The battery according to claim 2, characterized in that, The first groove is annular and disposed around the first shell; and / or, The first groove is annular and disposed around the second shell.

7. The battery according to claim 3, characterized in that, The battery includes a first through hole that penetrates the first connecting portion, the partition, and the second connecting portion, and part of the plastic frame is received in the first through hole.

8. The battery according to claim 3, characterized in that, The first shell includes a side wall, and the angle between the first connecting portion and the side wall is 15° to 85°; and / or, The second shell includes a side wall, and the angle between the second connecting portion and the side wall is 15° to 85°.

9. The battery according to claim 3, characterized in that, There is a gap between the first connecting portion and the partition, and part of the plastic frame is received in the gap; and / or, There is a gap between the second connecting portion and the partition, and part of the plastic frame is received in the gap.

10. The battery according to claim 1, characterized in that, The plastic frame is provided with a second through hole.

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