Battery, battery pack and electric equipment

Abstract

The utility model provides a battery, a battery pack and electric equipment, the battery comprises a shell, a cover plate and a battery cell, the shell is provided with an accommodating cavity, the accommodating cavity is used for accommodating the battery cell, one part of the cover plate extends into the accommodating cavity and is in contact with the side wall surface of the accommodating cavity, the cover plate and the shell are welded and fixed to seal the accommodating cavity, and the cover plate comprises at least two sub cover plates; the adjacent ends of the at least two sub cover plates are welded. The cover plate of the battery is formed by splicing the at least two sub cover plates, that is, the accommodating cavity is sealed by the split cover plate, so that when the shell and the cover plate are welded and fixed, the sub cover plates and the shell can be welded firstly, and then the sub cover plates are welded and spliced; therefore, 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 while the sealing performance is ensured, the welding yield is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, a battery pack and an electrical device. Background Art

[0002] With the rapid development of new energy vehicles, the market demand for power batteries is also expanding. Among them, for lithium batteries, in addition to key components such as battery cells, the battery shell also plays an important role in the performance of the battery.

[0003] In the prior art, the outer shell of a battery is usually formed by welding a shell and a cover plate to seal the battery cell and electrolyte in the shell. In order to meet the sealing requirements, the gap between the shell and the cover plate is required to be high during the assembly process, which makes the shell processing accuracy requirements and the manufacturing process more difficult, and increases the processing cost. Especially for thin-shell batteries, the welding difficulty is greater, and it is easy to have undesirable phenomena such as welding holes, resulting in sealing failure. Utility Model Content

[0004] To solve the above problems, the present application provides a battery that optimizes the structure of the shell and cover plate in the battery to meet the sealing requirements while reducing the welding difficulty and improving the welding yield. In addition, the present application also provides a battery pack and electrical equipment equipped with the battery, specifically including the following solutions:

[0005] In a first aspect, the present application provides a battery, which includes a shell and a cover plate, the shell having a accommodating cavity, the accommodating cavity is used to accommodate a battery cell, a portion of the cover plate extends into the accommodating cavity and contacts the side wall surface of the accommodating cavity, the cover plate is welded and fixed to the shell to seal the accommodating cavity, the cover plate includes at least two sub-cover plates, and adjacent ends of at least two sub-cover plates are welded.

[0006] The battery of the present application is provided with a shell to accommodate and protect the battery cell. The opening of the accommodating cavity is shielded by a cover plate, so that after the battery cell and electrolyte are loaded, the shell and the cover plate are fixedly connected by welding, thereby sealing the accommodating cavity to prevent the electrolyte from flowing out. At the same time, the present application also forms a cover plate by arranging at least two sub-cover plates for welding and assembly, so as to ensure that when the shell and the cover plate are welded and fixed, the assembly error between the cover plate and the shell can be transferred to between the sub-cover plates, thereby reducing the difficulty of welding and improving the welding yield.

[0007] It should be noted that for thin-shell batteries, the side walls of the shell are usually thinner, and in order to ensure the reliability of fixing the poles on the cover plate, the thickness of the cover plate is usually thicker than the side walls of the shell. When welding the shell and the cover plate, it is necessary to extend part of the cover plate into the accommodating cavity of the shell to contact or abut the inner wall surface of the shell, and then perform molten welding. The cover plate in the prior art is a whole, that is, an integrated cover plate. When the integrated cover plate is installed in the accommodating cavity, the surrounding surfaces of the cover plate will squeeze the inner wall surface of the shell, so that the dimensional tolerance between the cover plate and the shell is transferred to the corner of the shell, resulting in a gap between the corner of the shell and the part of the cover plate installed in the accommodating cavity, which in turn leads to poor welding phenomena such as weld holes. 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 accommodating cavity, so 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 are 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 production cost.

[0008] In one embodiment, a surface of the cover plate facing the accommodating cavity abuts against a side wall of the housing.

[0009] In this embodiment, the surface of the cover plate facing the accommodating cavity is arranged to abut against the side wall of the shell, that is, the area of ​​the cover plate is larger than the area of ​​the opening of the accommodating cavity, or it can be understood that the cover plate overlaps the side wall of the shell, which is conducive to the positioning between the cover plate and the shell, so as to facilitate the welding between the cover plate and the shell, and also improve the welding quality. Further, based on the fact that the area of ​​the cover plate is larger than the area of ​​the opening of the accommodating cavity, side welding can be selected, that is, laser welding can be used to weld from the side of the shell, which is conducive to protecting the pole located on the cover plate.

[0010] In one embodiment, one end of the accommodating cavity has an opening, and at least two sub-cover plates are arranged side by side along the length direction of the opening to close the opening.

[0011] In this embodiment, by arranging at least two sub-cover plates side by side along the length direction of the opening, the required welding length can be reduced, and excess residual stress caused by too long a weld can be avoided, which is beneficial to assembly and improves welding efficiency and welding reliability.

[0012] In one embodiment, a boss is protruded from the surface of the cover plate facing the accommodating cavity, the boss extends into the accommodating cavity, and the outer peripheral surface of the boss facing the side wall surface contacts the side wall surface.

[0013] In this embodiment, a boss is provided on the surface of the cover plate facing the accommodating cavity, so that when the cover plate and the shell are assembled, the boss is extended into the accommodating cavity and the outer peripheral surface of the boss contacts the inner surface of the shell, thereby further limiting the relative position between the cover plate and the shell, which is beneficial to the development of the welding process.

[0014] In one embodiment, the battery includes a pole, one end of which is fixed to the battery cell and the other end extends out of the cover plate, and the distance between the pole and the side wall is smaller than the distance between the welds formed by welding the pole and any two adjacent sub-cover plates.

[0015] 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 as to serve as a power lead-out terminal to lead the electric energy of the battery cell out of the shell. Since the area of ​​the cover plate is larger than the area of ​​the opening of the accommodating cavity, and since only top welding can be used between each sub-cover plate, the distance between the pole and the side wall is set to be smaller than the distance between the weld formed by the pole and any two adjacent sub-cover plates, that is, the pole is set closer to the edge of the cover plate relative to the weld between the sub-cover plates, so that when the sub-cover plates are welded by top welding, the damage of the laser to some parts in the pole can be reduced.

[0016] In one embodiment, the battery includes a pole and a cell, one end of the pole is conductively connected to the cell, and the other end extends out of the cover plate;

[0017] The pole comprises a positive pole and a negative pole, one of the at least two sub-cover plates is fixedly connected to the positive pole, and the other of the at least two sub-cover plates is fixedly connected to the negative pole.

[0018] In this embodiment, the positive pole and the negative pole are provided as the power lead-out terminals of the positive and negative electrodes of the battery cell. During assembly, the positive pole and the negative pole can be respectively passed through a sub-cover plate and fixed by welding to the sub-cover plate, and then the positive pole and the negative pole can be respectively welded and electrically connected to the positive and negative electrodes of the battery cell, and then each sub-cover plate is welded to the shell, and finally each sub-cover plate is overlapped and welded to transfer the assembly size tolerance to each sub-cover plate, and the welding of each sub-cover plate can eliminate the tolerance.

[0019] In one embodiment, two adjacent sub-cover plates are overlapped and connected.

[0020] In one embodiment, at least two adjacent ends of the sub-cover plates are clamped and fixed and then welded.

[0021] In one embodiment, among two adjacent sub-cover plates, one of the sub-cover plates is provided with a protrusion at one end facing the other sub-cover plate, and the other sub-cover plate is overlapped with the protrusion.

[0022] In this embodiment, by providing a protrusion on one of two adjacent sub-cover plates and making the other sub-cover plate overlap the protrusion, it is beneficial to position the sub-cover plates, thereby facilitating welding of the two sub-cover plates.

[0023] In one embodiment, two adjacent end surfaces of two adjacent sub-cover plates are both provided with protrusions.

[0024] In this embodiment, by providing protrusions on two adjacent end surfaces of two adjacent sub-cover plates, the positioning effect between the two adjacent sub-cover plates is improved.

[0025] In one embodiment, along the thickness direction of the cover plate, the thickness of one of the protrusions in two adjacent sub-cover plates is 1 / 4B, and the thickness of the other protrusion is 3 / B, where B is the thickness of the cover plate.

[0026] In one embodiment, along the length direction of the opening of the accommodating cavity, the extension length of the protrusion is L, and 0.5 mm≤L≤1 mm.

[0027] In one embodiment, the thickness of the side wall of the housing is A, and 0.05 mm ≤ A ≤ 0.2 mm.

[0028] In one embodiment, the thickness of the cover plate is B, and 0.5 mm ≤ B ≤ 3 mm.

[0029] In one embodiment, the material of the housing includes steel or aluminum.

[0030] In one embodiment, the cover plate is made of steel or aluminum.

[0031] In a second aspect, the present application provides a battery pack, which includes a box and a battery as described in any of the above embodiments, wherein the battery is accommodated in the box.

[0032] It can be understood that the battery pack provided in the second aspect of the present application, because it adopts the battery provided in the first aspect of the present application, also has all possible beneficial effects in any embodiment provided in the first aspect of the present application.

[0033] In a third aspect, the present application provides an electric device, which includes a functional module and a battery or a battery pack as described in any of the above embodiments, wherein the battery or the battery pack is used to provide electric energy to the functional module.

[0034] It can be understood that the electrical equipment provided in the third aspect of the present application, because it adopts 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 beneficial effects in any embodiment provided in the first aspect or the second aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a battery provided in one embodiment of the present application from one side perspective;

[0037] Figure 2 An exploded view of a battery provided in one embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of the structure of a cover plate provided in one embodiment of the present application;

[0039] Figure 4 A schematic structural diagram of a battery provided in one embodiment of the present application from another side perspective;

[0040] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0041] Figure 6 A schematic diagram of a cross-sectional structure of a battery provided in one embodiment of the present application;

[0042] Figure 7 This is a schematic diagram of the cross-sectional structure of a cover plate provided in another embodiment of the present application.

[0043] Figure numbers: 100-battery; 10-shell; 11-accommodating chamber; 12-opening; 13-side wall; 20-cover; 21-sub-cover; 22-boss; 23-main body; 231-chamfer; 24-flange; 30-battery cell; 40-pole; 50-first weld; 60-second weld; 61-long weld; 62-short weld; 70-bump; 70a-first bump; 70b-second bump; 71-lap platform; 80-insulating seal. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0045] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] The electrical equipment involved in the present application includes a functional module and a battery pack. Among them, the battery pack includes a box and a battery. The battery can be housed in the box, and the box can protect the battery to prevent the battery from being damaged by external impact. The battery in the battery pack is used to provide electrical energy to the functional module. Specifically, in one embodiment, the electrical equipment may include a vehicle, and the battery provided in the present application can be applied to the vehicle. The battery is fixed to the body of the vehicle and is used to provide electrical energy to each functional module of the vehicle. For example, the battery can be used for the starting, navigation and working power requirements of the vehicle during driving. In other embodiments, the battery can be used not only as the operating power supply of the vehicle, but also as the driving power supply of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. Among them, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0049] It is understandable that the battery described in the embodiments of the present application is not limited to vehicles. The battery provided in the present application can also be applied to but not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc., and the present application does not specifically limit this.

[0050] Please refer to Figures 1 to 5 ,in Figure 1 A schematic structural diagram of a battery 100 provided in one embodiment of the present application from one side perspective; Figure 2 An exploded view of a battery 100 provided in one embodiment of the present application; Figure 3 This is a schematic diagram of the structure of a cover plate 20 provided in one embodiment of the present application; Figure 4 A schematic structural diagram of a battery 100 provided in an embodiment of the present application from another side perspective; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle.

[0051] like Figures 1 to 5 As shown, the battery 100 provided in the present application includes a shell 10, a cover plate 20 and a battery cell 30. The shell 10 includes a accommodating chamber 11, which has an opening 12 and is used to accommodate the battery cell 30 and the electrolyte. The cover plate 20 is fixed to the side of the opening 12 of the shell 10 and shields the opening 12 of the accommodating chamber 11. The cover plate 20 is sealed and connected to the shell 10, that is, the cover plate 20 and the shell 10 are welded and fixed to seal the accommodating chamber 11. Specifically, a part of the cover plate 20 extends into the accommodating chamber 11 and contacts the side wall surface of the shell 10. So that when welding the shell 10 and the cover plate 20, the overlapping part of the cover plate 20 and the shell 10 is melted for welding to improve the welding strength. At the same time, the cover plate 20 is arranged in this way to be conveniently positioned at the opening 12 of the shell 10, thereby improving the assembly efficiency.

[0052] In one embodiment, the battery 100 further includes a pole 40, one end of which is fixedly connected to the battery cell 30 and is conductively connected to the battery cell 30, and the other end of which extends out of the cover plate 20 to serve as a power lead-out terminal to lead the electric energy of the battery cell 30 out of the shell 10. Further, the cover plate 20 is roughly plate-shaped, and the cover plate 20 includes two sub-cover plates 21, which are arranged side by side and spliced ​​to form the cover plate 20. In the solution of the present application, the two sub-cover plates 21 can be first welded and fixed to the shell 10 respectively, and then the two sub-cover plates 21 can be assembled by top welding.

[0053] It can be understood that the present application sets a cover plate 20 to shield the opening 12 of the accommodating cavity 11, so that after the battery cell 30 and the electrolyte are loaded, the shell 10 and the cover plate 20 are fixedly connected by welding, thereby sealing the accommodating cavity 11 to prevent the electrolyte from flowing out. At the same time, the present application also forms the cover plate 20 by setting at least two sub-cover plates 21 for welding and assembly, so as to ensure that when welding and fixing the shell 10 and the cover plate 20, the sub-cover plate 21 and the shell 10 can be welded first, and then each sub-cover plate 21 can be welded and assembled, so that the assembly error generated between the cover plate 20 and the shell 10 can be transferred to between the sub-cover plates 21, so as to reduce the difficulty of welding, and at the same time, it can also improve the welding yield and reduce the production cost.

[0054] It should be noted that the tolerance between the cover plate and the shell of a conventional battery is 0.1mm. After the cover plate and the shell of the battery in the prior art are clamped by a fixture, the tolerance is squeezed to the four corners of the battery. When welding the battery, since the self-filling laser welding of the parent material is adopted, the shell needs to be melted to fill the gap generated to ensure the sealing of the battery. However, for thin batteries, the side walls of the shell are usually thinner, and in order to ensure the reliability of fixing the poles on the cover plate, the thickness of the cover plate is usually thicker than the side walls of the shell. When welding the shell and the cover plate, it is necessary to extend part of the cover plate into the accommodating cavity of the shell to contact or abut the inner wall surface of the shell, and then perform a molten welding process. The cover plate in the prior art is a whole, that is, an integrated cover plate. When the integrated cover plate is installed in the accommodating cavity, the surrounding surfaces of the cover plate will squeeze the inner wall surface of the shell, so that the dimensional tolerance between the cover plate and the shell is transferred to the corner of the shell, resulting in a gap between the corner of the shell and the part where the cover plate is installed in the accommodating cavity. There is not enough cladding metal to fill the corner gap, which leads to poor welding phenomena such as lack of fusion and weld holes. At the same time, the corner gap generated by this structure is large, and there are many compensation gaps in the parent material during welding. The battery corners and short side welds are prone to residual stress and cracks, which increases the risk of failure during battery use and reduces the reliability of the battery.

[0055] In the battery 100 of the present application, the assembly gap at the corner of the battery 100 can be transferred to between the sub-cover plates 21 by using the split cover plate 20 and the shell 10 for sealing. The thickness of the sub-cover plate 21 is larger than that of the shell 10, and the cladding metal can easily fill the weld gap, thereby reducing the welding difficulty, improving the welding quality, and improving the feasibility of welding the thin-shell battery 100. Since the thinner shell 10 does not need to be melted to compensate for the larger weld gap when welding and fixing the shell 10 and the cover plate 20, the residual stress generated is small, the risk of delayed cracks is small, and the risk of welding failure of the battery 100 is reduced.

[0056] It can be understood that the laser beam based on laser welding has a high power density and can achieve a high welding depth-to-width ratio. At the same time, laser welding has the advantages of a small heat-affected zone and small thermal deformation of the weldment. The present application adopts a self-filling laser welding method of the parent material to weld the shell 10 and the cover plate 20, as well as to weld each sub-cover plate 21, which can improve the welding efficiency and improve the welding quality, while also reducing the production cost of the battery 100 and reducing the environmental requirements for welding.

[0057] It should be noted that the number of sub-cover plates 21 in the above embodiment is only for illustrative purposes and does not represent the number of sub-cover plates 21 in other embodiments of the present application. That is, the sub-cover plates 21 of the present application can be adapted according to the actual application scenario, and the present application does not specifically limit this.

[0058] In one embodiment, the battery 100 is a square battery, the opening 12 is rectangular, and the corresponding cover plate 20 is also rectangular. Two adjacent sub-cover plates 21 are welded to each other to form a first weld 50, and the shell 10 and the cover plate 20 are welded to form a second weld 60, and the second weld 60 includes a long weld 61 and a short weld 62. Before welding, the sub-cover plate 21 and the shell 10 are assembled. When welding, the shell 10 and the sub-cover plate 21 can be welded first. Furthermore, the short side of the sub-cover plate 21 and the opening 12 can be welded to form a short weld 62, and then the long side of the sub-cover plate 21 and the opening 12 can be welded to form a long weld 61. Finally, the two adjacent sub-cover plates 21 are welded to eliminate the assembly error between the cover plate 20 and the shell 10 and seal the accommodating cavity 11.

[0059] exist Figure 5In the illustrated embodiment, the surface of the cover plate 20 facing the accommodating cavity 11 abuts against the side wall 13 of the shell 10. That is, the area of ​​the cover plate 20 is larger than the area of ​​the opening 12 of the accommodating cavity 11. Or it can be understood that the cover plate 20 overlaps the side wall 13 of the shell 10. It can be understood that in this embodiment, the cover plate 20 is overlapped with the shell 10, which is conducive to the positioning between the cover plate 20 and the shell 10, so as to facilitate the welding between the cover plate 20 and the shell 10, and also improve the 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, and because the pole 40 is arranged on the cover plate 20, side welding can be selected, that is, laser welding can be used to weld from the side of the shell 10, so as to ensure the welding reliability while avoiding the laser beam from irradiating the pole 40 to damage the pole 40, thereby facilitating the reliability of the pole 40.

[0060] Please see Figure 6 , Figure 6 Schematic diagram of the cross-sectional structure of a battery 100 provided in one embodiment of the present application.

[0061] like Figure 5 and Figure 6 As shown, in one embodiment, a boss 22 is protruded from the surface of the cover plate 20 facing the accommodating cavity 11, the boss 22 extends into the accommodating cavity 11, and the outer peripheral surface of the boss 22 facing the side wall 13 contacts the inner surface of the side wall 13. Or it can be understood that the cover plate 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 side wall 13 of the shell 10, and the outer surface of the main body 23 abuts against the inner surface of the side wall 13. Among them, the main body 23 can be formed by splicing various sub-cover plates 21.

[0062] It can be understood that in the present embodiment, a boss 22 is provided on the surface of the cover plate 20 facing the accommodating cavity 11, so that when the cover plate 20 and the shell 10 are assembled, the boss 22 is extended into the accommodating cavity 11, and the outer peripheral surface of the boss 22 facing the side wall surface of the shell 10 is abutted against the side wall surface of the shell 10, thereby further limiting the relative position between the cover plate 20 and the shell 10, which is beneficial to the development of the welding process.

[0063] It should be noted that the boss 22 serving as the positioning structure in the above-mentioned cover plate 20 is only introduced as an example and does not represent the specific form of the positioning structure in other embodiments. That is, in some other embodiments, other positioning structures can be provided on the cover plate 20 according to the actual application scenario. For example, the positioning structure can be provided in the form of a ring wall, etc. As long as the positioning between the cover plate 20 and the shell 10 can be achieved, the present application does not make any special limitation on this.

[0064] In one embodiment, the battery 100 includes a pole 40, and the number of poles 40 is two. The two poles 40 are respectively a positive pole and a negative pole. One end of the pole 40 is fixed to the battery cell 30 and is conductively connected to the battery cell 30, and the other end extends out of the cover plate 20. The distance between the pole 40 and the side wall 13 is less than the distance between the weld formed by welding the pole 40 and any two adjacent sub-cover plates 21. It can be understood that in this embodiment, by setting one end of the pole 40 to be fixed to the battery cell 30 and the other end extending out of the cover plate 20, it serves as a power lead-in terminal to lead the electric energy of the battery cell 30 out of the housing 10. At the same time, since only top welding can be used between the sub-cover plates 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 used between the sub-cover plate 21 and the shell 10. By setting the distance between the pole 40 and the side wall 13 to be smaller than the distance between the welds formed by welding the pole 40 and any two adjacent sub-cover plates 21, that is, setting the pole 40 closer to the edge of the cover plate 20 relative to the weld between the sub-cover plates 21, it is possible to reduce the damage of the laser to some components in the pole 40 when the sub-cover plate 21 is welded by top welding.

[0065] It should be noted that during assembly, the positive electrode column and the negative electrode column can be first respectively inserted into a sub-cover 21 and welded to the sub-cover 21, and then the positive electrode column and the negative electrode column are respectively welded to the positive and negative electrodes of the battery cell 30 for electrical connection, and then each sub-cover 21 is welded to the shell 10, and finally each sub-cover 21 is overlapped and welded to transfer the assembly size tolerance to each sub-cover 21. The welding of each sub-cover 21 can eliminate the tolerance.

[0066] like Figure 1 As shown, in one embodiment, the opening 12 is rectangular, and each sub-cover plate 21 is arranged side by side along the length direction of the opening 12. Or it can be understood that each sub-cover plate 21 is arranged side by side along the length direction of the shell 10. It can be understood that in this embodiment, based on the rectangular opening 12 of the accommodating cavity 11, that is, the battery 100 is a square battery, by arranging each sub-cover plate 21 side by side along the length direction of the opening 12, the required welding length can be reduced, so that the welds between each sub-cover plate 21 are shorter, thereby avoiding the excessive residual stress caused by the weld being too long, which is beneficial to assembly and improves the reliability of the battery 100, while reducing the difficulty of welding and improving the welding quality.

[0067] It should be noted that the shape of the opening 12 in the above embodiment is only for illustrative purposes 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 in the present application can be adaptively adjusted according to the actual application scenario. For example, in another embodiment, the opening 12 can be circular. That is, the battery 100 is a cylindrical battery, and the two sub-cover plates 21 can be arranged along the radial direction of the opening.

[0068] In one embodiment, the number of poles 40 is two, and the number of sub-cover plates 21 is also two. The two poles 40 are respectively a positive pole 40 and a negative pole 40, serving as the positive and negative poles of the battery 100. Both poles 40 are electrically connected to the battery cell 30, and respectively pass through a sub-cover plate 21 to extend out of the accommodating cavity 11. It can be understood that arranging both poles 40 on the cover plate 20, that is, arranging them on the same side of the shell 10, can reduce the overall volume of the battery 100, which is conducive to optimizing the spatial layout. At the same time, arranging a pole 40 to pass through a sub-cover plate 21 is conducive to the assembly between the pole 40 and the sub-cover plate 21.

[0069] Furthermore, 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, that is, the first weld 50 is located in the middle of the cover plate 20. Each pole 40 is closer to the side wall 13 of the shell 10 relative to the first weld 50. It can be understood that arranging the pole 40 away from the first weld 50 can avoid the residual stress of the first weld 50 affecting the pole 40 of the battery 100, and can also avoid the pole 40 being damaged by the laser beam due to the close distance between the pole 40 and the first weld 50 during the laser welding process.

[0070] Please see Figure 2 and Figure 5 In one embodiment, of the two adjacent sub-cover plates 21, a protrusion 70 is convexly provided on the surface of one of the sub-cover plates 21 facing the other sub-cover plate 21, and the other sub-cover plate 21 is overlapped on the protrusion 70. It can be understood that in this embodiment, by providing the protrusion 70 on one of the two adjacent sub-cover plates 21 and making the other sub-cover plate 21 overlap on the protrusion 70, it is beneficial to position the sub-cover plates 21, thereby facilitating the welding of the two sub-cover plates 21 and improving the welding quality.

[0071] It should be noted that, in the above embodiment, the method of overlapping and then welding by setting the protrusions 70 is only an exemplary introduction. In another embodiment, two adjacent sub-cover plates 21 can also be first clamped and then welded, which can also achieve the same beneficial effects as in the above embodiment.

[0072] In one embodiment, the extension length of the protrusion 70 is L along the length direction of the opening 12, and 0.5 mm ≤ L ≤ 1 mm. In this embodiment, the extension length of the protrusion 70 is set between 0.5 mm and 1 mm to ensure reliable positioning between adjacent sub-cover plates 21, and to prevent the protrusion 70 from extending too long to affect the welding effect between adjacent sub-cover plates 21, so as to ensure the strength of the cover plate 20.

[0073] Please see Figure 7 , Figure 7It is a schematic diagram of the cross-sectional structure of a cover plate 20 provided in another embodiment of the present application.

[0074] like Figure 7 As shown, in one embodiment, among two adjacent sub-cover plates 21, one of the sub-cover plates 21 is provided with a lap platform 71 on the side facing the accommodating cavity 11, and the lap platform 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 lap platform 71 on the side facing the accommodating cavity 11, and the other sub-cover plate 21 is directly lapped on the L-shaped lap platform 71, which is also conducive to the positioning between the two sub-cover plates 21, facilitating the welding of the two sub-cover plates 21, and improving the welding quality.

[0075] In one embodiment, two adjacent end surfaces of two adjacent sub-cover plates 21 are both provided with protrusions 70. It can be understood that providing protrusions 70 on two adjacent end surfaces of two adjacent sub-cover plates 21 at the same time is conducive to improving the positioning effect between the two adjacent sub-cover plates 21.

[0076] exist Figure 5 In the illustrated embodiment, the two protrusions 70 on the adjacent two end surfaces of the two adjacent sub-cover plates 21 are respectively a first protrusion 70a and a second protrusion 70b. The second protrusion 70b overlaps the first protrusion 70a. Along the plane direction perpendicular to the cover plate 20, the total thickness of the cover plate 20 is Bmm, the thickness of the first protrusion 70a is 1 / 4Bmm, and the thickness of the second protrusion 70b is 3 / 4Bmm. It can be understood that in this embodiment, based on the second protrusion 70b overlapping the first protrusion 70a, the thickness of the first protrusion 70a is set to 1 / 4Bmm, and the thickness of the second protrusion 70b is set to 3 / 4Btmm, that is, along the plane direction perpendicular to the cover plate 20, the overlap of the first protrusion 70a and the second protrusion 70b is lower than the welding point between the shell 10 and the cover plate 20, so as to ensure that when the side wall 13 of the shell 10 is clamped by an external clamp during the welding process, the adjacent sub-cover plates 21 will not be lifted.

[0077] In one embodiment, the thickness of the side wall 13 of the shell 10 is A, and 0.05mm≤A≤0.2mm. It can be understood that the battery 100 of the present application sets the thickness of the side wall 13 of the shell 10 to be between 0.05mm and 0.2mm, so as to ensure that the shell 10 has a lighter weight while achieving its basic functions, thereby facilitating the lightweight design of the battery 100.

[0078] In one embodiment, the total thickness of the cover plate 20 is B, and 0.5mm≤B≤3mm. It is understandable that the battery 100 of the present application sets the total thickness of the cover plate 20 between 0.05mm and 0.2mm to ensure that the cover plate 20 has a lighter weight while achieving basic functions, which is conducive to the lightweight design of the battery 100. At the same time, the total thickness of the cover plate 20 is set to be greater than the thickness of the shell 10 to ensure that there is enough cladding metal between the welded sub-cover plates 21 to fill the assembly gap.

[0079] In one embodiment, the material of the housing 10 includes steel or aluminum, and the material of the cover plate 20 includes steel or aluminum. It can be understood that using steel or aluminum to make the housing 10 and the cover plate 20 can ensure that the battery 100 has a certain strength, thereby preventing foreign objects from hitting the battery 100 and damaging the battery cell 30.

[0080] exist Figure 6 In the illustrated embodiment, 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 to separate the pole 40 from the cover plate 20. It can be understood that the material of the technical cover plate 20 includes aluminum and steel, and the insulating seal 80 is used to isolate the pole 40 and the cover plate 20, which can avoid the pole 40 and the cover plate 20 from being connected to each other and causing short circuits and other undesirable phenomena.

[0081] like Figure 6 As shown, in one embodiment, the cover plate 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 side wall 13 of the shell 10, and the outer surface of the main body 23 abuts against the inner surface of the side wall 13. A chamfer 231 is provided on the side of the main body 23 close to the accommodating cavity 11, or it can be understood that the distance from the main body 23 to the side wall 13 of the shell 10 gradually increases along the plane direction perpendicular to the cover plate 20. It can be understood that in this embodiment, a chamfer 231 is provided on the side of the main body 23 close to the accommodating cavity 11, and the chamfer 231 can be used to guide 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 shell 10, thereby reducing the assembly difficulty between the cover plate 20 and the shell 10 and improving the assembly efficiency between the cover plate 20 and the shell 10.

[0082] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A battery, characterized in that: The invention comprises a shell and a cover plate, wherein the shell has a receiving cavity for receiving a battery cell, a part of the cover plate extends into the receiving cavity and contacts with a side wall surface of the receiving cavity, the cover plate is welded and fixed to the shell to seal the receiving cavity, and the cover plate comprises at least two sub-cover plates, and adjacent ends of the at least two sub-cover plates are welded.

2. The battery according to claim 1, characterized in that One end of the accommodating cavity has an opening, and the at least two sub-cover plates are arranged side by side along the length direction of the opening to close the opening.

3. The battery according to claim 1, characterized in that The cover plate is provided with a boss on a surface facing the accommodating cavity. The boss extends into the accommodating cavity. The outer peripheral surface of the boss facing the side wall surface contacts the side wall surface.

4. The battery according to claim 1, characterized in that The battery comprises a pole and a cell, one end of the pole is conductively 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-cap plates is fixedly connected to the positive pole, and the other of the at least two sub-cap plates is fixedly connected to the negative pole.

5. The battery according to any one of claims 1 to 4, characterized in that: The two adjacent sub-cover plates are overlapped and connected.

6. The battery according to claim 5, characterized in that Among the two adjacent sub-cover plates, one of the sub-cover plates is provided with a protruding block at one end facing the other sub-cover plate, and the other sub-cover plate is overlapped with the protruding block.

7. The battery according to claim 6, characterized in that The protrusions are convexly provided on two adjacent end surfaces of the two adjacent sub-cover plates.

8. The battery according to claim 7, characterized in that Along the thickness direction of the cover plate, the thickness of one of the protrusions in the two adjacent sub-cover plates is 1 / 4B, and the thickness of the other protrusion is 3 / 4B, where B is the thickness of the cover plate.

9. The battery according to claim 6, characterized in that Along the length direction of the opening of the accommodating cavity, the extension length of the protrusion is L, and 0.5mm≤L≤1mm.

10. The battery according to any one of claims 1 to 4, characterized in that: The thickness of the side wall of the shell is A, and 0.05mm≤A≤0.2mm; and / or, The thickness of the cover plate is B, and 0.5 mm ≤ B ≤ 3 mm.

11. The battery according to any one of claims 1 to 4, characterized in that: The shell is made of steel or aluminum; the cover is made of steel or aluminum.

12. A battery pack, characterized in that: It comprises a box and the battery according to any one of claims 1 to 11, wherein the battery is accommodated in the box.

13. An electrical equipment, characterized in that: It comprises a functional module, and a battery as described in any one of claims 1 to 11 or a battery pack as described in claim 12, wherein the battery or the battery pack is used to provide electrical energy to the functional module.

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