Battery shell and battery

Abstract

The invention relates to the technical field of batteries, in particular to a battery shell and a battery, and aims to solve the problems that the connection strength between an existing battery shell and a plastic frame is poor and the sealing performance is poor when the existing battery shell is subjected to injection molding on a flange. In order to achieve the purpose, the battery shell comprises a bottom wall, a side wall arranged around the bottom wall and a connecting part which is arranged on the side wall and extends in the direction away from the battery shell, and a plurality of through holes are formed in the connecting part. According to the invention, the connecting part and the through hole are arranged on the battery shell, and the through hole is filled with the high-pressure injection molding material during injection molding, so that the connecting part and the plastic frame are tightly connected, and the connecting strength and the sealing effect of the plastic frame and the connecting part are improved.

Description

Technical Field

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

[0002] With the development of technology and the rise of environmental awareness, new energy vehicles have received increasing attention due to their low pollution, low noise and other characteristics. New energy vehicles refer to vehicles that use unconventional vehicle fuels as the power source (or use conventional vehicle fuels and adopt new vehicle-mounted power devices), and integrate advanced technologies in the power control and drive of vehicles to form vehicles with advanced technical principles, new technologies and new structures. Among new energy vehicles, pure electric vehicles have become the development focus of new energy vehicles. As the main power source, automotive batteries are an essential part of new energy vehicles.

[0003] Currently, traditional batteries all use laser welding to achieve the connection and sealing of the housing. However, laser welding generally has problems of low welding yield and difficulty in disassembly. Violent disassembly may damage the battery cells, thereby affecting the stability and sealing effect of the overall battery structure. In order to improve the stability and sealing effect of the battery structure, a plastic frame can be injection-molded on the battery flange to achieve the connection and sealing of the battery housing. However, the flange of the battery housing is usually a smooth plane, so the bonding force between the flange and the plastic frame is poor and the sealing effect is not ideal, which cannot meet the requirements of the battery for stability and safety.

[0004] Correspondingly, the art needs a new technical solution 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 problem of low connection strength between the battery housing and the plastic frame.

[0006] To this end, on the one hand, the present invention provides a battery housing, which includes: a receiving portion including a bottom wall and a side wall surrounding the bottom wall; a connecting portion provided with a through hole and disposed on the side wall.

[0007] In the above specific embodiment having the battery housing, there are a plurality of through holes spaced around the side wall.

[0008] In the above specific embodiment having the battery housing, the through hole is strip-shaped.

[0009] In the above specific embodiment having the battery housing, the connecting portion is provided with a groove disposed on the end face of the connecting portion.

[0010] In the above specific embodiment having the battery housing, there are a plurality of grooves spaced apart.

[0011] In the above specific embodiment with a battery housing, in the thickness direction, the connecting portion inclines towards the bottom wall, and the included angle θ between the connecting portion and the side wall ranges from 15° to 85°.

[0012] On the other hand, the present invention provides a battery, which includes a first battery housing, a second battery housing and a plastic frame. The first battery housing and the second battery housing are the battery housings described in any one of the above, and the plastic frame covers the outer end surface of the connecting portion of the first battery housing and the second battery housing, and part of the plastic frame is received in the through hole.

[0013] In the above specific embodiment with a battery, the battery further includes a partition provided between the first battery housing and the second battery housing, and the through hole also penetrates through the partition.

[0014] In the above specific embodiment with a battery housing, the connecting portion of the first battery housing and / or the connecting portion of the second battery housing is provided with a groove, and part of the plastic frame is received in the groove.

[0015] In the above specific embodiment with a battery housing, there is a gap between the connecting portion of the first battery housing and the partition and / or between the connecting portion of the second battery housing and the partition, and part of the plastic frame is received in the gap.

[0016] In the case of adopting the above technical solution, in the present invention, a connecting portion and a through hole are provided on the battery housing. The connecting portion is arranged in a circle along the circumferential direction of the side wall, and the plastic frame is also arranged in a circle along the circumferential direction of the side wall. The plastic frame is made of plastic. During the processing, a plastic frame is formed by injection molding in a circle along the circumferential direction of the connecting portion to cover the connecting portion, thereby sealing the battery housing. When injection molding, the high-pressure injection material will fill into the through hole to tightly connect the connecting portion and the plastic frame, improving the connection strength between the plastic frame and the connecting portion and the sealing performance of the battery housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0018] Figure 1 is a schematic structural view of the battery housing in the present invention;

[0019] Figure 2 is an exploded view of the battery housing and the plastic frame of the present invention;

[0020] Figure 3 is an assembly view of the first battery housing and the second battery housing in the present invention;

[0021] Figure 4 is an assembly view of the battery housing and the plastic frame in the present invention;

[0022] Figure 5 is the top view of the battery housing and the plastic frame after assembly in the present invention;

[0023] Figure 6 is Figure 5 a schematic cross-sectional view of the first embodiment at A-A in;

[0024] Figure 7 is Figure 6 an enlarged view of B in, in which a groove is shown;

[0025] Figure 8 is Figure 5 a schematic cross-sectional view of the second embodiment at A-A in;

[0026] Figure 9 is Figure 5 a schematic cross-sectional view of the third embodiment at A-A in;

[0027] Figure 10 is Figure 9 an enlarged view of C in.

[0028] In the figure: 11, the first battery housing; 12, the second battery housing; 13, the partition; 14, the connecting part; 141, the first connecting part; 142, the second connecting part; 15, the bottom wall; 16, the side wall; 17, the through hole; 171, the first through hole; 172, the second through hole; 173, the third through hole; 18, the groove; 2, the plastic frame; 3, the gap. Detailed Embodiments

[0029] 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 principle 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.

[0030] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should 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 may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may 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 circumstances.

[0032] Furthermore, in order to more clearly show the core technical solution of the present invention, the description below omits the description of other well-known structures in the battery. However, this omission is only for the convenience of description and does not mean that the battery can be without these structures.

[0033] As Figures 1-5 shown, the present invention provides a battery housing, including a receiving portion. The receiving portion includes a bottom wall 15 and a side wall 16 disposed around the bottom wall 15. The battery housing further includes a connecting portion 14 disposed on the side wall 16 and extending in a direction away from the battery housing, and a plurality of through holes 17 are provided on the connecting portion 14.

[0034] The receiving portion formed by the bottom wall 15 and the side wall 16 is used to accommodate the battery core, which is mostly in the form of a cover structure. In other embodiments, the receiving portion may also be other structures, which will not be elaborated here.

[0035] In order to solve the problem of low connection strength between the battery housing and the plastic frame 2, the present utility model provides a connecting portion 14 and through holes 17 on the battery housing. As Figures 1 to 4 shown, the connecting portion 14 is provided in a circle along the circumferential direction of the side wall 16, and the plastic frame 2 is also provided in a circle along the circumferential direction of the side wall 16. The plastic frame 2 is made of plastic and is injection-molded in a circle along the circumferential direction of the connecting portion 14 to wrap the connecting portion 14, thereby connecting and sealing the battery housing. When injection-molding, the high-pressure injection material will fill into the through holes 17. The injection material in the through holes 17 is equivalent to a screw, tightly connecting the connecting portion 14 and the plastic frame 2, improving the connection strength between the plastic frame 2 and the connecting portion 14, and further improving the connection strength between the plastic frame 2 and the battery housing, preventing the housing from detaching from the plastic frame 2, and improving the sealing performance of the battery housing.

[0036] Further, as Figure 1 and Figure 2 shown, in order to enhance the connection strength between the plastic frame 2 and the connecting portion 14, a plurality of through holes 17 are provided, and the plurality of through holes 17 are spaced apart around the side wall 16. There is a certain interval between the through holes 17, increasing the connection strength between the connecting portion 14 and the plastic frame 2 along the entire circumferential direction, and improving the sealing performance of the battery in all directions.

[0037] It should be noted that Figure 1The number and arrangement of the through holes 17 shown are not limitations of the present invention. Without departing from the basic principles of the present invention, those skilled in the art can adjust the number and arrangement of the through holes 17, which does not deviate from the principles of the present invention, and thus will fall within the protection scope of the present invention.

[0038] The first direction is the height direction of the side wall 16, shown as the Z direction in the figure, the second direction is the length direction of the bottom wall 15, shown as the Y direction in the figure, and the third direction is the width direction of the bottom wall 15, shown as the X direction in the figure.

[0039] Further, as Figures 1-2 shown, the through hole 17 is strip-shaped. The strip hole has a larger contact area and contact strength, enabling more injection molding materials to be accommodated in the through hole 17, improving the connection strength between the connecting portion 14 and the plastic frame 2. The strip-shaped structure is easier to design and construct, and provides sufficient space while maintaining the structural strength. In addition, the opening of the strip hole is narrow, which can avoid weakening the strength and stiffness of the connecting portion 14 and prevent the connecting portion 14 from being easily bent or broken after the through hole 17 is provided thereon. Moreover, due to the limited width of the connecting portion 14, the length direction of the through hole 17 is arranged along the length direction of the bottom wall 15, and the width direction is arranged along the width direction of the bottom wall 15. When the strip hole and the circular hole have the same size in the third direction, the strip hole can provide a larger injection molding material filling area and filling space, thereby improving the connection strength.

[0040] Both ends of the strip hole are arc-shaped, which is not prone to stress concentration, and can avoid the damage of the connecting portion 14 caused by stress concentration; and the strip hole is more variable and adjustable than the circular hole, and is more easily adapted to different manufacturing and assembly requirements.

[0041] It should be noted that those skilled in the art can set the through hole 17 as a circular hole, a square hole, etc. in practical applications. Such adjustments and changes to the specific shape of the through hole 17 do not deviate from the principles and scope of the present invention, and should all be limited within the protection scope of the present invention. Of course, the present invention preferably uses the strip hole as the through hole 17.

[0042] Further, as Figure 6 and Figure 7 shown, in order to improve the connection strength between the plastic frame 2 and the connecting portion 14, a groove 18 is provided on the connecting portion 14 around the side wall 16. The groove 18 is provided on at least one end face of the connecting portion 14 in the thickness direction, and the thickness direction of the connecting portion 14 is the first direction. During the injection molding process, the injection molding material will penetrate into the groove 18, thereby improving the connection strength and sealing effect between the plastic frame 2 and the connecting portion 14.

[0043] The connecting portion 14 has an upper end face and a lower end face along the first direction. The groove 18 can be provided on the upper end face or the lower end face alone, or can be provided on both the upper end face and the lower end face at the same time.

[0044] Furthermore, as Figure 7 shown, a plurality of grooves 18 are provided and are spaced apart in a direction away from the side wall 16. The depth of some of the grooves 18 close to the side wall 16 is less than the depth of the grooves 18 away from the side wall 16. The direction away from the side wall 16 is the third direction. Grooves 18 are provided at both positions away from and close to the side wall 16, which can integrally improve the connection strength between the connecting portion 14 and the plastic frame 2 along the third direction; at the same time, the injection molding material in some of the grooves 18 close to the side wall 16 is less than the injection molding material in the grooves 18 away from the side wall 16, and the connection strength of the part of the connecting portion 1 away from the side wall 16 is emphatically strengthened to prevent the edge of the connecting portion 1 from separating from the plastic frame 2.

[0045] The depth of the groove 18 is the dimension of the groove 18 along the first direction. In this application, the groove 18 is used to improve the connection strength between the connecting portion 14 and the plastic frame 2. If the depth of the groove 18 is too shallow, it will affect the connection strength between the connecting portion 14 and the plastic frame 2. If the depth of the groove 18 is too deep, it will affect the strength of the connecting portion 14, resulting in the connecting portion 14 being easily damaged. Therefore, the depth of the groove 18 cannot be too deep or too shallow, and the depth of the groove 18 can be reasonably adjusted according to the size of the first connecting portion 141. In this embodiment, it is preferably that the depth of some of the grooves 18 close to the side wall 16 is less than the depth of the grooves 18 away from the side wall 16.

[0046] In addition, the plurality of grooves 18 can be equally spaced or unequally spaced along the third direction. For example, the closer to the edge of the connecting portion, the greater the interval between the grooves. It should be noted that those skilled in the art can also arrange the plurality of grooves 18 to be spaced apart along the second direction in actual applications. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention. Of course, in the present invention, it is preferably that the groove 18 is arranged in a strip shape and surrounds the side wall 16.

[0047] Those skilled in the art can arrange the groove 18 to be cylindrical, square or strip-shaped, etc. in actual applications. Such adjustment and change of the specific shape of the groove 18 do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention.

[0048] Furthermore, as Figure 8As shown, in order to improve the connection strength between the plastic frame 2 and the connecting portion 14, in the thickness direction, the free end of the connecting portion 14 is inclined toward the bottom wall 15. The plane where the bottom of the connecting portion 14 is located in the first direction is plane one. When injecting, the injection material is filled between the connecting portion 14 and plane one, increasing the contact area between the connecting portion 14 and the plastic frame 2, thereby improving the connection strength and sealing effect between the connecting portion 14 and the plastic frame 2. In this solution, it is preferably that the included angle θ between the inclined portion of the connecting portion 14 and the side wall 16 ranges from 15° to 85°.

[0049] Those skilled in the art can select the way of inclined setting of the connecting portion 14 according to the actual situation, and adjust the included angle between the connecting portion 14 and plane one, which do not deviate from the principle of the present invention, so they will all fall within the protection scope of the present invention.

[0050] A battery, such as Figures 2-5 As shown, the battery includes a first battery housing 11, a second battery housing 12 and a plastic frame 2. The first battery housing 11 and the second battery housing 12 are the battery housings of any one of the above. The plastic frame 2 is coated on the outer end surface of the connecting portion 14 of the first battery housing 11 and the second battery housing 12, and the plastic frame 2 is partially received in the through hole 17. The connecting portion 14 includes a first connecting portion 141 provided on the first battery housing 11 and a second connecting portion 142 provided on the second battery housing 12; the through hole 17 includes a first through hole 171 provided on the first connecting portion 141 and a second through hole 172 provided on the second connecting portion 142. When injecting, the injection material is filled into the first through hole 171 and the second through hole 172 to improve the connection strength between the plastic frame 2 and the first connecting portion 141 and the second connecting portion 142.

[0051] Further, as Figures 2-10 As shown, the battery further includes a partition 13 provided between the first battery housing 11 and the second battery housing 12. The edge of the partition 13 is between the connecting portions 14 of the first battery housing 11 and the second battery housing 12, and the through hole 17 penetrates through the edge of the partition 13. When the battery includes the partition 13, in order to improve the connection strength between the plastic frame 2 and the connecting portion 14, the through hole 17 penetrates through the partition 13.

[0052] As Figure 2 and Figure 6As shown in the figure, the first battery housing 11, the partition 13, and the second battery housing 12 are arranged in sequence along the first direction. The connecting portion 14 includes a first connecting portion 141 provided on the first battery housing 11 and a second connecting portion 142 provided on the second battery housing 12. The through hole 17 includes a first through hole 171 provided on the first connecting portion 141, a second through hole 172 provided on the second connecting portion 142, and a third through hole 173 on the partition 13. The first through hole 171, the third through hole 173, and the second through hole 172 are sequentially connected. During injection molding, the injection molding material is filled into the first through hole 171, the third through hole 173, and the second through hole 172 and is injection molded into an integral body with the injection molding material in other parts. Since the third through hole 173 connects the first through hole 171 and the second through hole 172, the injection molding material in the through hole 17 is equivalent to a screw, tightly connecting the first battery housing 11, the partition 13, and the second battery housing 12, and improving the connection strength between the plastic frame 2 and the connecting portion 14.

[0053] In addition, it should be noted that the battery structure of the present invention is not limited to the form composed of "the first battery housing 11 + the second battery housing 12" and "the first battery housing 11 + the partition 13 + the second battery housing 12". Without departing from the basic principle of the present invention, those skilled in the art can adopt batteries with other structures. For example, the battery structure can also be composed of a housing main body and a cover plate. The housing main body is the battery housing of any one of the above, a connecting portion 14 is provided on the housing main body and the cover plate, and a through hole 17 is provided on the connecting portion 14, and then the connecting portion 14 is coated by injection molding to play a sealing role.

[0054] It should be noted that providing the third through hole 173 communicating with the first through hole 171 and the second through hole 172 on the partition 13 is a preferred solution. The third through hole 173 may not be provided on the partition 13 in the present invention. The sizes of the partitions 13 in different models of batteries are different, and those skilled in the art can select different solutions according to different partitions 13. If the overlapping area of the partition 13 with the first connecting portion 141 and / or the second connecting portion 142 is large, or the partition 13 can cover the positions of the first through hole 171 and / or the second through hole 172, then the third through hole 173 can be provided on the partition 13. For example, Figure 6 if the edge of the partition 13 in [example] is flush with the edges of the first connecting portion 141 and the second connecting portion 142, then the third through hole 173 can be provided on the partition 13. If the overlapping area of the partition 13 with the first connecting portion 141 and / or the second connecting portion 142 is small and the third through hole 173 cannot be provided, then only the first through hole 171 is provided on the first connecting portion 141 and the second through hole 172 is provided on the second connecting portion 142.

[0055] Furthermore, as Figures 6-7As shown, in order to improve the connection strength and sealing effect between the first battery housing 11 and / or the second battery housing 12 and the plastic frame 2, a groove 18 is provided on the connecting portion 14 of the first battery housing 11 and / or the connecting portion 14 of the second battery housing 12, and a part of the plastic frame 2 is received in the groove 18.

[0056] As Figure 7 shown, a groove 18 is provided on the upper surface of the first connecting portion 141, and a groove 18 is provided on the lower surface of the second connecting portion 142. The plastic frame 2 completely covers the first connecting portion 141 and the second connecting portion 142 and is partially received in the groove 18, thereby sealing between the first connecting portion 141 and the partition 13 and between the second connecting portion 142 and the partition 13.

[0057] It should be noted that those skilled in the art can, in actual applications, provide the groove 18 only on the first connecting portion 141, or alternatively, can also provide the groove 18 only on the second connecting portion 142. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should all be limited within the protection scope of the present invention. The present invention preferably provides the groove 18 on both the first connecting portion 141 and the second connecting portion 142.

[0058] Furthermore, as Figures 6-7 shown, in order to increase the contact area between the plastic frame 2 and the first battery housing 11 and / or the second battery housing 12, there is a gap 3 between the connecting portion 14 of the first battery housing 11 and the edge of the partition 13 and / or between the connecting portion 14 of the second battery housing 12 and the edge of the partition 13, and a part of the plastic frame is received in the gap 3.

[0059] As Figure 7 shown, there is a gap 3 between the first connecting portion 141 and / or the second connecting portion 142 and the partition 13. There is a first gap between the first connecting portion 141 and the partition 13. During injection molding, the injection molding material fills into the first gap to improve the connection strength between the first connecting portion 141 and the partition 13 and the plastic frame 2; or there is a second gap between the second connecting portion 142 and the partition 13. During injection molding, the injection molding material fills into the second gap to improve the connection strength between the second connecting portion 142 and the partition 13 and the plastic frame 2; or a first gap and a second gap are simultaneously formed between the first connecting portion 141 and the second connecting portion 142 and the partition 13. During injection molding, the injection molding material fills into the first gap and the second gap to improve the connection strength between the first connecting portion 141, the partition 13 and the second connecting portion 142 and the plastic frame 2.

[0060] Those skilled in the art can choose whether to provide the first gap and the second gap according to the actual situation, as well as the size of the gap 3 in the first direction. These do not deviate from the principle of the present invention and will therefore all fall within the protection scope of the present invention.

[0061] If there are gaps 3 between both the first connecting portion 141 and the second connecting portion 142 and the partition plate 13, grooves 18 can be provided on both the upper and lower surfaces of the first connecting portion 141 and the second connecting portion 142.

[0062] Those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0063] So far, the technical solutions of the present invention have been described in conjunction 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 housing, characterized in that, The battery housing includes: a receiving portion, the receiving portion including a bottom wall and a side wall disposed around the bottom wall; a connecting portion, the connecting portion being provided with a through hole and disposed on the side wall.

2. The battery housing according to claim 1, characterized in that, A plurality of the through holes are provided and are spaced apart around the side wall.

3. The battery housing according to claim 1, characterized in that, The through holes are elongated.

4. The battery housing according to claim 1, characterized in that, The connecting portion is provided with a groove, and the groove is disposed on an end face of the connecting portion.

5. The battery housing according to claim 4, characterized in that, A plurality of the grooves are provided and are spaced apart.

6. The battery housing according to claim 1, characterized in that, In the thickness direction, the connecting portion inclines towards the bottom wall, and the included angle θ between the connecting portion and the side wall ranges from 15° to 85°.

7. 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 the second battery housing are the battery housings according to any one of claims 1-6. The plastic frame covers an outer end face of a connecting portion of the first battery housing and the second battery housing, and part of the plastic frame is received in the through hole.

8. The battery according to claim 7, characterized in that, The battery further includes a partition disposed between the first battery housing and the second battery housing, and the through hole also penetrates through the partition.

9. The battery according to claim 8, characterized in that, The connecting portion of the first battery housing and / or the connecting portion of the second battery housing is provided with a groove, and part of the plastic frame is received in the groove.

10. The battery according to claim 8, characterized in that, There is a gap between the connecting portion of the first battery housing and the partition and / or between the connecting portion of the second battery housing and the partition, and part of the plastic frame is received in the gap.

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