CN222355256U - Battery, battery pack and electric equipment - Google Patents

Abstract

The present application provides a battery, a battery pack and an electrical device, the battery comprising a shell, a cover plate and a battery cell, the shell having a receiving cavity, the receiving cavity being used to receive the battery cell, a portion of the cover plate extending into the receiving cavity and contacting the side wall of the receiving cavity, the cover plate being welded and fixed to the shell to seal the receiving cavity, the cover plate comprising at least two sub-cover plates, at least two adjacent ends of the sub-cover plates being welded. The cover plate of the battery of the present application is formed by splicing at least two sub-cover plates, that is, a split cover plate is used to seal the receiving cavity, so as to ensure that when welding and fixing the shell and the cover plate, the sub-cover plate and the shell can be welded first, and then the sub-cover plates can be welded and assembled, so that the assembly size tolerance between the cover plate and the shell can be transferred to between the sub-cover plates, so as to reduce the difficulty of welding while ensuring the sealing requirement, and at the same time improve the welding yield and reduce the manufacturing cost.

Description

Battery, battery pack and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery, a battery pack and electric equipment.

Background

With the rapid development of new energy automobiles, the market demand of power batteries is also expanding. Among them, in addition to key components such as a battery cell, a battery case plays an important role in battery performance.

In the prior art, the casing of the battery is typically formed by welding a case and a cover plate to seal the cells and electrolyte within the casing. In order to meet the requirement of tightness, the requirement on the gap between the shell and the cover plate is higher in the assembly process, so that the requirement on the machining precision of the shell and the difficulty of the manufacturing process are higher, and the machining cost is increased. Particularly for the thin-shell battery, the welding difficulty is higher, and poor phenomena such as welding holes and the like easily occur to cause sealing failure.

Disclosure of utility model

In order to solve the problems, the application provides a battery, which can reduce welding difficulty and improve welding yield while meeting tightness by pertinently optimizing the structures of a shell and a cover plate in the battery. In addition, the application also provides a battery pack carrying the battery and electric equipment, and the battery pack specifically comprises the following scheme:

In a first aspect, the application provides a battery, the battery comprising a housing and a cover plate, the housing having a receiving cavity for receiving a battery cell, a portion of the cover plate extending into the receiving cavity and contacting a sidewall surface of the receiving cavity, the cover plate being welded to the housing to seal the receiving cavity, the cover plate comprising at least two sub-cover plates, adjacent ends of the at least two sub-cover plates being welded.

The battery is provided with the shell to accommodate and protect the battery core. The cover plate is arranged to cover the opening of the accommodating cavity, so that after the battery cell and the electrolyte are filled, the shell and the cover plate are fixedly connected by adopting a welding means, and the accommodating cavity is sealed to avoid the electrolyte from flowing out. Meanwhile, the cover plate is formed by welding and assembling at least two sub-cover plates, so that assembly errors generated between the cover plate and the shell can be transferred to the space between the sub-cover plates when the shell and the cover plate are welded and fixed, the welding difficulty can be reduced, and the welding yield can be improved.

It should be noted that, for a thin-case battery, the side wall of the case is generally thin, and in order to ensure reliability of fixing the pole at the cover plate, the thickness of the cover plate is generally thicker than the side wall of the case. When the shell and the cover plate are welded, part of the cover plate needs to extend into the accommodating cavity of the shell to be in contact with or abut against the inner wall surface of the shell, and then fusion welding treatment is carried out. The cover plate in the prior art is an integral cover plate. When the integral type apron is packed into and is held the chamber, the internal face of casing can be extruded to the face all around of apron to make the dimensional tolerance between apron and the casing shift to the bight of casing, lead to the bight of casing to produce the clearance with the part that the apron was packed into and is held the chamber, and then lead to producing and weld bad phenomenon such as hole. The cover plate of the battery is formed by splicing at least two sub-cover plates, namely, the split cover plate is adopted to seal the accommodating cavity, so that when the shell and the cover plate are welded and fixed, the sub-cover plate and the shell can be welded and assembled, and then the assembly dimensional tolerance between the cover plate and the shell can be transferred between the sub-cover plates, so that the welding difficulty is reduced, the welding yield is improved, and the manufacturing cost is reduced under the condition of ensuring the tightness.

In one embodiment, the surface of the cover plate facing the receiving chamber abuts against a side wall of the housing.

In this embodiment, through setting up the apron towards the surface of holding the chamber and the lateral wall butt of casing, the area of apron is greater than the area of holding the chamber opening promptly, or can understand that the apron overlap joint is in the lateral wall of casing to be favorable to the location between apron and the casing, so that the welding between apron and the casing, also can improve welding quality simultaneously. Further, based on the area of the cover plate being larger than the area of the opening of the accommodating cavity, side welding can be selected, namely, laser welding can be used for welding from the side face of the shell, so that the protection of the pole on the cover plate is facilitated.

In one embodiment, the accommodating cavity has an opening at one end, and at least two sub-cover plates are arranged side by side along the length direction of the opening and close the opening.

In this embodiment, through setting up at least two sub-apron and placing side by side along open-ended length direction, can reduce required welding length, avoid producing unnecessary residual stress because of the welding seam is too long to be favorable to the assembly, improve welding efficiency and welding reliability.

In one embodiment, the surface of the cover plate facing the accommodating cavity is convexly provided with a boss, the boss stretches into the accommodating cavity, and the outer peripheral surface of the boss facing the side wall surface is in contact with the side wall surface.

In this embodiment, the boss is protruded on the surface of the cover plate facing the accommodating cavity, so that when the cover plate and the housing are assembled, the boss extends into the accommodating cavity, and the outer peripheral surface of the boss contacts with the inner surface of the housing, so that the relative position between the cover plate and the housing can be further limited, and the welding process is facilitated to be unfolded.

In one embodiment, the battery comprises a pole, one end of the pole is fixed on the battery core, the other end of the pole extends out of the cover plate, and the distance between the pole and the side wall is smaller than the distance between the pole and a welding seam formed by welding any two adjacent sub-cover plates.

In this embodiment, one end of the pole is fixed to the battery cell, and the other end extends out of the cover plate, so that the electric energy of the battery cell is led out of the housing as a power leading-out end. The area based on the apron is greater than the area that holds the chamber opening, simultaneously because only adopt the top to weld between each sub-apron, set up the distance between post and the lateral wall and be less than the distance between the welding seam that post and arbitrary two adjacent sub-apron welding formed, set up the post for the welding seam between the sub-apron and be close to the edge of apron promptly to can reduce the damage of laser to part spare part in post when adopting the top to weld the sub-apron.

In one embodiment, the battery comprises a pole and a battery core, wherein one end of the pole is connected to the battery core in a conductive way, and the other end of the pole extends out of the cover plate;

The pole comprises a positive pole and a negative pole, one of the at least two sub-cover plates is fixedly connected with the positive pole, and the other of the at least two sub-cover plates is fixedly connected with the negative pole.

In the embodiment, the positive pole and the negative pole are arranged to serve as power extraction ends of the positive pole and the negative pole of the battery cell. During assembly, the positive pole post and the negative pole post can be respectively penetrated into one sub-cover plate and are welded and fixed with the sub-cover plate, then the positive pole post and the negative pole post are respectively and electrically connected with the positive pole and the negative pole of the battery cell in a welding way, then each sub-cover plate is welded with the shell, and finally each sub-cover plate is welded after being lapped so as to transfer assembly dimensional tolerance to each sub-cover plate, and the welding of each sub-cover plate can eliminate the tolerance.

In one embodiment two adjacent sub-deck panels are lap-joined.

In one embodiment, at least two sub-cover plates are welded after being clamped and fixed at adjacent ends.

In one embodiment, in two adjacent sub-cover plates, one end of one sub-cover plate facing the other sub-cover plate is convexly provided with a convex block, and the other sub-cover plate is lapped on the convex block.

In this embodiment, by arranging the bump on one of the two adjacent sub-cover plates and overlapping the other sub-cover plate on the bump, positioning between the sub-cover plates is facilitated, so that welding of the two sub-cover plates is facilitated.

In one embodiment, two adjacent end surfaces of two adjacent sub-cover plates are provided with protruding blocks.

In this embodiment, the bumps are disposed on the two adjacent end faces of the two adjacent sub-cover plates, so as to facilitate improving the positioning effect between the two adjacent sub-cover plates.

In one embodiment, along the thickness direction of the cover plate, one of the two adjacent sub-cover plates has a thickness of 1/4B, the other has a thickness of 3/B, and B is the thickness of the cover plate.

In one embodiment, the extension length of the bump is L along the length direction of the opening of the accommodating cavity, and 0.5 mm.ltoreq.L.ltoreq.1 mm.

In one embodiment, the sidewall of the housing has a thickness A, and 0.05 mm.ltoreq.A.ltoreq.0.2 mm.

In one embodiment, the cover plate has a thickness B, and 0.5 mm.ltoreq.B.ltoreq.3 mm.

In one embodiment, the material of the housing comprises steel or aluminum.

In one embodiment, the cover plate comprises steel or aluminum.

In a second aspect, the present application provides a battery pack comprising a case and a battery as in any of the embodiments described above. Wherein, the battery is accommodated in the box body.

It will be appreciated that the battery pack according to the second aspect of the present application, because of the use of the battery according to the first aspect of the present application, also provides all the possible benefits of any of the embodiments according to the first aspect of the present application.

In a third aspect, the present application provides an electrical device, where the electrical device includes a functional module and a battery or a battery pack according to any of the embodiments described above. The battery active battery pack is used for providing electric energy for the functional module.

It can be appreciated that the electric device provided in the third aspect of the present application, due to the battery provided in the first aspect of the present application or the battery pack provided in the second aspect of the present application, also has all possible advantageous effects provided in any embodiment provided in the first aspect or the second aspect of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing a structure of a battery according to an embodiment of the present application;

fig. 2 is an exploded view of a battery provided in one embodiment of the present application;

FIG. 3 is a schematic view of a cover plate according to an embodiment of the present application;

FIG. 4 is a schematic view of a battery according to an embodiment of the present application from another side;

FIG. 5 is a schematic cross-sectional view of the structure at A-A in FIG. 4;

Fig. 6 is a schematic cross-sectional structure of a battery provided in an embodiment of the present application;

fig. 7 is a schematic cross-sectional structure of a cover plate according to another embodiment of the application.

Reference numerals 100-battery, 10-case, 11-receiving cavity, 12-opening, 13-side wall, 20-cover plate, 21-sub-cover plate, 22-boss, 23-main body, 231-chamfer, 24-flange, 30-cell, 40-post, 50-first weld, 60-second weld, 61-long weld, 62-short weld, 70-bump, 70 a-first bump, 70 b-second bump, 71-landing and 80-insulating seal.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The electric equipment comprises a functional module and a battery pack. The battery pack comprises a box body and a battery. The battery is accommodated in the box body, and the box body can protect the battery and prevent the battery from being damaged due to external impact. The battery in the battery pack is used for providing electric energy for the functional module. Specifically, in one embodiment, the electric equipment may include a vehicle, and the battery provided by the application may be applied to the vehicle. The battery is fixed to the body of the vehicle and is used for supplying electric energy to each functional module of the vehicle. For example, the battery may be used for operating power requirements during start-up, navigation, and travel of the vehicle. In other embodiments, the battery may not only serve as an operating power source for the vehicle, but may also serve as a driving power source for the vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extending vehicle.

It will be appreciated that the battery described in the embodiments of the present application is not limited to use in vehicles. The battery provided by the application can also be applied to, but is not limited to, mobile phones, tablets, notebook computers, electric toys, electric tools, battery cars, electric automobiles, ships, spacecrafts and the like, and the application is not limited to the specific application.

Referring to fig. 1 to 5, fig. 1 is a schematic view illustrating a structure of a battery 100 according to an embodiment of the present application, fig. 2 is an exploded view illustrating the battery 100 according to an embodiment of the present application, fig. 3 is a schematic view illustrating a cover 20 according to an embodiment of the present application, fig. 4 is a schematic view illustrating a structure of a battery 100 according to another embodiment of the present application, and fig. 5 is a schematic view illustrating a cross-section of fig. 4 at A-A.

As shown in fig. 1 to 5, the battery 100 provided by the present application includes a case 10, a cap plate 20, and a battery cell 30. Wherein the housing 10 comprises a receiving cavity 11, the receiving cavity 11 having an opening 12 and being adapted to receive the battery cell 30 and the electrolyte. The cover plate 20 is fixed to the opening 12 side of the housing 10 and shields the opening 12 of the accommodating chamber 11. The cover plate 20 is connected with the housing 10 in a sealing manner, i.e. the cover plate 20 is welded to the housing 10 in order to seal the receiving space 11. Specifically, a part of the cover plate 20 protrudes into the accommodation chamber 11 and contacts the side wall surface of the housing 10. So that when welding casing 10 and apron 20, the part that melts apron 20 and casing 10 overlap welds and promotes welding strength, so set up apron 20 can conveniently be positioned in the opening 12 of casing 10 simultaneously, improves assembly efficiency.

In one embodiment, the battery 100 further includes a pole 40, one end of the pole 40 is fixedly connected with the battery core 30 and is electrically connected with the battery core 30, and the other end extends out of the cover 20 to serve as a power extraction end to extract the electric energy of the battery core 30 from the housing 10. Further, the cover 20 is substantially plate-shaped, and the cover 20 includes two sub-covers 21, and the two sub-covers 21 are disposed side by side and spliced to form the cover 20. In the scheme of the application, after the two sub-cover plates 21 are welded and fixed with the shell 10 respectively, the two sub-cover plates 21 can be assembled by top welding.

It can be appreciated that the cover plate 20 is arranged to cover the opening 12 of the accommodating cavity 11, so that after the battery cell 30 and the electrolyte are filled, the casing 10 and the cover plate 20 are fixedly connected by adopting a welding method, thereby sealing the accommodating cavity 11 and preventing the electrolyte from flowing out. Meanwhile, the cover plate 20 is formed by welding and assembling at least two sub-cover plates 21, so that when the shell 10 and the cover plate 20 are welded and fixed, the sub-cover plates 21 and the shell 10 can be welded and assembled firstly, and then the sub-cover plates 21 are welded and assembled, so that assembly errors generated between the cover plate 20 and the shell 10 can be transferred between the sub-cover plates 21, the welding difficulty can be reduced, the welding yield can be improved, and the manufacturing cost can be reduced.

It should be noted that the tolerance between the cover plate and the case of the conventional battery is 0.1mm, and the battery of the prior art is pressed to four corners of the battery after the cover plate and the case are clamped by the jig. When the battery is welded, the self-filling laser welding of the base material is adopted, and the shell needs to be melted to fill the generated gaps, so that the tightness of the battery is ensured. However, for thin batteries, the side walls of the case are generally thinner, and in order to ensure reliability in fixing the posts at the cover plate, the thickness of the cover plate is generally thicker than the side walls of the case. When the shell and the cover plate are welded, part of the cover plate needs to extend into the accommodating cavity of the shell to be in contact with or abut against the inner wall surface of the shell, and then fusion welding treatment is carried out. The cover plate in the prior art is an integral cover plate. When the integral type apron is packed into and is held the chamber, the internal face of casing can be extruded to the face all around of apron to make the dimensional tolerance between apron and the casing shift to the bight of casing, lead to the bight of casing to produce the clearance with the part that the apron was packed into and is held the chamber, do not have sufficient cladding metal to fill bight gap, and then lead to producing not fusing, weld bad phenomenon such as hole. Meanwhile, the gap at the corner part generated by the structure is larger, the compensation gap of the base metal is more during welding, residual stress and cracks are easy to generate at the corner part and the welding seam of the short side of the battery, the failure risk is high during the use of the battery, and the reliability of the battery is reduced.

In the battery 100 of the present application, the split cover plate 20 and the housing 10 are used to seal in a matching manner, so that the assembly gap at the corner of the battery 100 can be transferred between the sub-cover plates 21, the thickness of the sub-cover plates 21 is larger than that of the housing 10, and the weld gap can be easily filled with the cladding metal, so that the welding difficulty is reduced, the welding quality is improved, and the welding feasibility of the thin-shell battery 100 is improved. Because the case 10 does not need to be thinner to melt and compensate for larger weld gaps when the case 10 and the cover plate 20 are welded and fixed, the residual stress generated is smaller, the risk of delayed cracking is smaller, and the risk of welding failure of the battery 100 is reduced.

It can be appreciated that the laser beam based on laser welding has high power density, can realize high welding depth-to-width ratio, and has the advantages of smaller heat affected zone, small thermal deformation of a weldment and the like, and the application adopts a mode of self-filling laser welding of a base material to weld the shell 10 and the cover plate 20 and welds each sub-cover plate 21, thereby improving welding efficiency, improving welding quality, reducing manufacturing cost of the battery 100 and reducing environmental requirements of welding.

It should be noted that the number of the neutron cover plates 21 in the above embodiment is only described as an example, and does not represent the number of the neutron cover plates 21 in other embodiments of the application. That is, the sub-cover plate 21 of the present application may be adaptively introduced according to the actual application scenario, which is not particularly limited by the present application.

In one embodiment, the battery 100 is a square battery, the opening 12 is rectangular, and the corresponding cover plate 20 is also rectangular. The adjacent two sub-cover plates 21 are welded to each other to form a first welding seam 50, and the shell 10 and the cover plate 20 are welded to form a second welding seam 60, wherein the second welding seam 60 comprises a long welding seam 61 and a short welding seam 62. The sub-cover 21 is assembled with the housing 10 before welding. The case 10 and the sub-cover 21 may be welded first. Further, the minor edges of the sub-cover 21 and the opening 12 may be welded to form the short weld 62, and then the major edges of the sub-cover 21 and the opening 12 may be welded to form the long weld 61. Finally, two adjacent sub-cover plates 21 are welded to eliminate assembly errors between the cover plate 20 and the housing 10 and to seal the receiving chamber 11.

In the embodiment shown in fig. 5, the surface of the cover plate 20 facing the accommodation chamber 11 abuts against the side wall 13 of the housing 10. I.e. the area of the cover plate 20 is larger than the area of the opening 12 of the receiving chamber 11. Or it can be understood that the cover 20 overlaps the sidewall 13 of the housing 10. It can be appreciated that in the present embodiment, the cover plate 20 is overlapped with the housing 10, which is beneficial to positioning between the cover plate 20 and the housing 10, so as to facilitate welding between the cover plate 20 and the housing 10, and improve welding quality. Further, based on the fact that the area of the cover plate 20 is larger than the area of the opening 12 of the accommodating cavity 11, meanwhile, since the pole 40 is arranged on the cover plate 20, side welding can be selected, namely, laser welding can be used for welding from the side face of the shell 10, so that welding reliability is guaranteed, meanwhile, laser beams can be prevented from being irradiated to the pole 40 to damage the pole 40, and reliability of the pole 40 is guaranteed.

Referring to fig. 6, fig. 6 is a schematic cross-sectional structure of a battery 100 according to an embodiment of the application.

As shown in fig. 5 and 6, in one embodiment, the cover plate 20 is provided with a boss 22 protruding toward the surface of the accommodating chamber 11, the boss 22 protrudes into the accommodating chamber 11, and the outer peripheral surface of the boss 22 facing the side wall 13 is in contact with the inner surface of the side wall 13. Or it can be understood that the cover 20 includes a main body 23 and a flange 24, the flange 24 surrounds the edge of the main body 23, the main body 23 extends into the accommodating chamber 11, the flange 24 abuts against the top of the side wall 13 of the housing 10, and the outer surface of the main body 23 abuts against the inner surface of the side wall 13. Wherein the main body 23 may be formed by splicing the respective sub-cover plates 21.

It will be appreciated that in the present embodiment, the boss 22 is provided on the surface of the cover plate 20 facing the accommodating chamber 11, so that when the cover plate 20 and the housing 10 are assembled, the boss 22 is inserted into the accommodating chamber 11, and the outer peripheral surface of the sidewall surface of the boss 22 facing the housing 10 is abutted against the sidewall surface of the housing 10, so that the relative position between the cover plate 20 and the housing 10 can be further defined, which is advantageous for the development of the welding process.

It should be noted that the boss 22 as the positioning structure in the cover 20 is only described as an example, and is not representative of the specific form of the positioning structure in other embodiments, that is, in other embodiments, other positioning structures may be disposed on the cover 20 according to the actual application scenario, for example, the positioning structure may be disposed in a form of a ring wall, etc., so long as positioning between the cover 20 and the housing 10 can be achieved, which is not particularly limited in the present application.

In one embodiment, battery 100 includes poles 40, the number of poles 40 being two. The two poles 40 are a positive pole and a negative pole, respectively. One end of the pole 40 is fixed on the battery core 30 and is connected with the battery core 30 in a conductive way, and the other end extends out of the cover plate 20. The distance between the pole 40 and the side wall 13 is smaller than the distance between the pole 40 and the weld formed by welding any two adjacent sub-covers 21. It can be appreciated that in the present embodiment, by providing one end of the pole 40 fixed to the battery cell 30 and the other end extending out of the cover 20, the electric energy of the battery cell 30 is led out of the housing 10 as a power outlet. Meanwhile, as only top welding can be adopted between each sub-cover plate 21 and the area of the cover plate 20 is larger than the area of the opening 12 of the accommodating cavity 11, side welding can be adopted between the sub-cover plates 21 and the shell 10, and the distance between the pole 40 and the side wall 13 is smaller than the distance between the pole 40 and the welding seam formed by welding any two adjacent sub-cover plates 21, namely the welding seam between the pole 40 and the sub-cover plates 21 is arranged to be closer to the edge of the cover plate 20, so that when the top welding is adopted for welding the sub-cover plates 21, the damage of laser to part of parts in the pole 40 can be reduced.

It should be noted that, during assembly, the positive electrode post and the negative electrode post may be first inserted into one sub-cover plate 21 and welded and fixed with the sub-cover plate 21, then the positive electrode post and the negative electrode post are electrically connected with the positive electrode and the negative electrode of the battery cell 30, then the sub-cover plates 21 are welded with the casing 10, and finally the sub-cover plates 21 are lapped and welded to transfer the assembly dimensional tolerance to the sub-cover plates 21, and the welding of the sub-cover plates 21 can eliminate the tolerance.

In one embodiment, as shown in fig. 1, the opening 12 is rectangular, and the sub-covers 21 are arranged side by side along the length of the opening 12. Or it can be understood that the individual sub-cover plates 21 are arranged side by side along the length of the housing 10. It can be appreciated that in this embodiment, based on the rectangular shape of the opening 12 of the accommodating cavity 11, that is, the battery 100 is a square battery, by arranging the sub-cover plates 21 side by side along the length direction of the opening 12, the required welding length can be reduced, so that the welding seam between the sub-cover plates 21 is shorter, and the excessive residual stress generated by the too long welding seam is avoided, thereby being beneficial to assembly, providing reliability of the battery 100, reducing the welding difficulty and improving the welding quality.

It should be noted that the shape of the opening 12 in the above embodiment is only described as an example, and does not represent the specific shape of the opening 12 in other embodiments of the present application. That is, the shape of the opening 12 of the present application may be adaptively adjusted according to the practical application, for example, in another embodiment, the opening 12 may be circular. I.e., the battery 100 is a cylindrical battery, in which case the two sub-covers 21 may be arranged in the radial direction of the opening.

In one embodiment, the number of poles 40 is two, as are the number of sub-covers 21. The two posts 40 are a positive post 40 and a negative post 40, respectively, to serve as a positive electrode and a negative electrode of the battery 100. Both poles 40 are electrically connected to the battery cells 30 and pass through one of the sub-covers 21 to protrude from the accommodating chamber 11, respectively. It will be appreciated that the provision of both posts 40 on the cover 20, i.e. on the same side of the housing 10, reduces the overall volume of the battery 100, which is advantageous for optimizing the spatial layout. And meanwhile, one pole 40 is arranged to pass through one sub-cover plate 21, so that the assembly between the pole 40 and the sub-cover plate 21 is facilitated.

Further, the welding between the two sub-cover plates 21 forms a first weld 50, and the two sub-cover plates 21 have the same shape, i.e. the first weld 50 is located at the middle of the cover plate 20. Each pole 40 is closer to the side wall 13 of the housing 10 than the first weld 50. It will be appreciated that disposing the post 40 away from the first weld 50 may prevent residual stress of the first weld 50 from affecting the post 40 of the battery 100, and may also prevent the post 40 from being damaged by the laser beam caused by the closer distance between the post 40 and the first weld 50 during the laser welding process.

Referring to fig. 2 and 5, in one embodiment, two adjacent sub-cover plates 21, wherein a surface of one sub-cover plate 21 facing the other sub-cover plate 21 is convexly provided with a bump 70, and the other sub-cover plate 21 is overlapped with the bump 70. It can be appreciated that in the present embodiment, by providing the bump 70 on one of the two adjacent sub-cover plates 21 and overlapping the other sub-cover plate 21 on the bump 70, positioning between the sub-cover plates 21 is facilitated, thereby facilitating welding of the two sub-cover plates 21 and improving welding quality.

It should be noted that, in the above embodiment, the manner of welding after the bump 70 is overlapped is merely described as an example. In another embodiment, two adjacent sub-cover plates 21 may be clamped and then welded, so that the same advantages as those of the above embodiment can be achieved.

In one embodiment, the extension of the bump 70 along the length of the opening 12 is L, and 0.5 mm.ltoreq.L.ltoreq.1 mm. In the present embodiment, the extension length of the bump 70 is set between 0.5mm and 1mm to ensure reliable positioning effect between the adjacent sub-cover plates 21, and meanwhile, the bump 70 is prevented from extending too long to affect the welding effect between the adjacent sub-cover plates 21, so as to ensure the strength of the cover plate 20.

Referring to fig. 7, fig. 7 is a schematic cross-sectional structure of a cover plate 20 according to another embodiment of the application.

As shown in fig. 7, in one embodiment, in two adjacent sub-cover plates 21, one sub-cover plate 21 is provided with a lapping table 71 toward the accommodating chamber 11, and the lapping table 71 extends toward the other sub-cover plate 21. Or it can be understood that one of the sub-cover plates 21 is provided with an L-shaped lapping table 71 towards one side of the accommodating cavity 11, and the other sub-cover plate 21 is directly lapped on the L-shaped lapping table 71, which is also beneficial to positioning between the two sub-cover plates 21, is convenient for welding the two sub-cover plates 21, and improves welding quality.

In one embodiment, the adjacent two end surfaces of the adjacent two sub-cover plates 21 are each provided with a bump 70. It will be appreciated that the provision of the projections 70 on the adjacent two end faces of the adjacent two sub-cover plates 21 is beneficial to improving the positioning effect between the adjacent two sub-cover plates 21.

In the embodiment shown in fig. 5, two projections 70 on adjacent two end faces of adjacent two sub-cover plates 21 are a first projection 70a and a second projection 70b, respectively. The second bump 70b overlaps the first bump 70 a. Along the direction perpendicular to the plane of the cover plate 20, the total thickness of the cover plate 20 is Bmm, the thickness of the first bump 70a is 1/4Bmm, and the thickness of the second bump 70b is 3/4Bmm. It can be appreciated that, in the present embodiment, based on the second bump 70b overlapping the first bump 70a, the thickness of the first bump 70a is 1/4Bmm, and the thickness of the second bump 70b is 3/4Btmm, that is, the overlapping position of the first bump 70a and the second bump 70b is lower than the welding position of the housing 10 and the cover 20 along the direction perpendicular to the plane of the cover 20, so as to ensure that the adjacent sub-cover 21 will not be tilted when the side wall 13 of the housing 10 is clamped by the external clamp during the welding process.

In one embodiment, the sidewall 13 of the housing 10 has a thickness A of 0.05 mm.ltoreq.A.ltoreq.0.2 mm. It can be appreciated that the thickness of the side wall 13 of the housing 10 is 0.05 mm-0.2 mm, so that the battery 100 has lighter weight on the premise of ensuring the basic function of the housing 10, thereby being beneficial to the lightweight design of the battery 100.

In one embodiment, the total thickness of the cover plate 20 is B, and 0.5 mm.ltoreq.B.ltoreq.3 mm. It can be appreciated that the battery 100 of the present application has a light weight by setting the total thickness of the cover plate 20 to be 0.05 mm-0.2 mm, so as to facilitate the light weight design of the battery 100 on the premise of ensuring the basic function of the cover plate 20. The total thickness of the cover plate 20 is set to be larger than the thickness of the shell 10 so as to ensure that enough cladding metal is filled in the assembly gaps between the welded sub-cover plates 21.

In one embodiment, the material of the housing 10 comprises steel or aluminum, and the material of the cover 20 comprises steel or aluminum. It will be appreciated that the case 10 and the cover 20 made of steel or aluminum can ensure a certain strength of the battery 100, so that foreign objects can be prevented from striking the battery 100 to damage the battery cells 30.

In the embodiment shown in fig. 6, the battery 100 of the present application further includes an insulating seal 80. The insulating seal 80 is sleeved on the pole 40 and is used for separating the pole 40 from the cover plate 20. It can be appreciated that the technical cover 20 is made of aluminum and steel, and the insulating sealing member 80 is used to isolate the pole 40 from the cover 20, so as to avoid the adverse phenomena of short circuit and the like caused by the conduction between the pole 40 and the cover 20.

As shown in fig. 6, in one embodiment, the cover 20 includes a main body 23 and a flange 24, the flange 24 surrounds the edge of the main body 23, the main body 23 extends into the accommodating cavity 11, the flange 24 abuts against the top of the sidewall 13 of the housing 10, and the outer surface of the main body 23 abuts against the inner surface of the sidewall 13. The body 23 is provided with a chamfer 231 on a side close to the receiving chamber 11, or it can be understood that the distance of the body 23 from the side wall 13 of the housing 10 increases gradually in a direction perpendicular to the plane of the cover plate 20. It can be appreciated that in this embodiment, the chamfer 231 is disposed on the side of the main body 23 near the accommodating cavity 11, and the chamfer 231 can be used for guiding the main body 23 of the cover plate 20 to extend into the accommodating cavity 11 during the assembly process of the cover body and the housing 10, so as to reduce the assembly difficulty between the cover plate 20 and the housing 10 and improve the assembly efficiency between the cover plate 20 and the housing 10.

It should be appreciated that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It is to be understood that the application is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims. Those skilled in the art will recognize that the full or partial flow of the embodiments described above can be practiced and equivalent variations of the embodiments of the present application are within the scope of the appended claims.

Claims (13)

1. The utility model provides a battery, its characterized in that includes casing, apron, the casing has and holds the chamber, hold the chamber and be used for acceping the electric core, a portion of apron stretches into hold the chamber and with hold the lateral wall face contact in chamber, the apron with casing welded fastening is in order to seal hold the chamber, the apron includes two at least sub-apron, two at least adjacent one end welding of sub-apron.

2. The battery according to claim 1, wherein the accommodating chamber has an opening at one end, and the at least two sub-cover plates are arranged side by side along a length direction of the opening and close the opening.

3. The battery according to claim 1, wherein a surface of the cover plate facing the accommodating chamber is provided with a boss which protrudes into the accommodating chamber, and an outer peripheral surface of the boss facing the side wall surface is in contact with the side wall surface.

4. The battery of claim 1, wherein the battery comprises a pole and a cell, one end of the pole is electrically connected to the cell, and the other end extends out of the cover plate;

The pole comprises a positive pole and a negative pole, one of the at least two sub-cover plates is fixedly connected with the positive pole, and the other of the at least two sub-cover plates is fixedly connected with the negative pole.

5. The battery of any one of claims 1-4, wherein adjacent ones of the two sub-cap plates are lap-joined.

6. The battery according to claim 5, wherein one end of one of the adjacent sub-covers facing the other sub-cover is provided with a protruding block, and the other sub-cover is overlapped with the protruding block.

7. The battery according to claim 6, wherein the projections are provided protruding from both of the adjacent end faces of the adjacent two sub-cap plates.

8. The battery according to claim 7, wherein in a thickness direction of the cover plate, a thickness of one of the projections of adjacent two sub-cover plates is 1/4B, a thickness of the other projection is 3/4B, and B is a thickness of the cover plate.

9. The battery according to claim 6, wherein the extension length of the projection is L along the length direction of the opening of the accommodation chamber, and 0.5 mm.ltoreq.l.ltoreq.1 mm.

10. The battery according to any one of claims 1 to 4, wherein the side wall of the case has a thickness A of 0.05 mm.ltoreq.A.ltoreq.0.2 mm, and/or,

The thickness of the cover plate is B, and B is more than or equal to 0.5mm and less than or equal to 3mm.

11. The battery of any one of claims 1-4, wherein the material of the housing comprises steel or aluminum and the material of the cover comprises steel or aluminum.

12. A battery pack comprising a case and the battery of any one of claims 1 to 11, the battery being housed in the case.

13. A powered device comprising a functional module, and a battery as claimed in any one of claims 1 to 11 or a battery pack as claimed in claim 12 for providing electrical energy to the functional module.