Battery, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a battery, a battery pack and electric equipment, and relates to the technical field of batteries. Wherein the outer surface of the battery cell is provided with a groove which is sunken towards the inside of the battery cell, the shell is sleeved outside the battery cell and at least partially covers the groove, the shell is provided with a connecting part at a position corresponding to the groove, and the connecting part is at least partially sunken towards one side of the battery cell and is propped against the groove. In the embodiment of the invention, the shell is provided with the connecting part corresponding to the groove of the battery cell, so that the shell can be connected with the groove of the battery cell in a welding manner through the connecting part. Compared with a contact fit or interference fit mode, the welding connection mode is non-detachable, more stable in connection and smaller in internal resistance, the current transmission efficiency of the battery is improved, the energy loss of the battery is reduced, the service life of the battery is prolonged, a welding point is prevented from protruding out of the shell, and the appearance effect of the structure is ensured.

Description

Technical Field

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

[0002] A lithium battery generally includes a battery cell and a shell covering the battery cell. When the battery cell is packaged, the shell needs to be electrically connected to the electrodes of the battery cell.

[0003] In the related art, the electrical connection between the shell of lithium battery and the electrode of the battery cell includes the following two methods: the first method is to set a circuit board connecting piece between the shell and the electrode, and use contact to achieve electrical connection between the two; the other method is to make the shell and the electrode of the battery cell electrically connected through interference fit. However, both of the above two connection methods have the problems of high internal resistance and unstable connection, which affects the current transmission efficiency of the battery, increases the energy loss of the battery, and makes it difficult to ensure the service life of the battery. Utility Model Content

[0004] The present application aims to provide a battery, a battery pack and an electrical device to solve the problems of high internal resistance and poor connection stability in the connection method between the existing battery shell and the battery cell.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a battery, comprising: a battery cell and a shell; wherein:

[0007] The outer surface of the battery cell is provided with a groove recessed toward the inside of the battery cell, the shell is sleeved on the outside of the battery cell and at least partially covers the groove, the shell is provided with a connecting portion at a position corresponding to the groove, the connecting portion is at least partially recessed toward one side of the battery cell and abuts against the groove.

[0008] Optionally, the connecting portion is provided with a notch and a bent portion extending and bending from the notch toward one side of the battery core, and the bent portion abuts against the groove.

[0009] Optionally, the connecting portion and the shell are an integrally formed structure.

[0010] Optionally, the battery cell is a cylindrical battery cell, and the groove is an annular groove extending continuously along the circumference of the battery cell.

[0011] Optionally, the battery cell comprises two ends which are arranged in opposite directions along the axial direction, a positive electrode ear of the battery cell is led out from one of the two ends to form a positive electrode of the battery cell, and the groove is arranged close to the positive electrode.

[0012] Optionally, the shell is a cylindrical shell, the number of the connecting parts is multiple, and the multiple connecting parts are arranged at intervals along the circumference of the shell.

[0013] Optionally, the number of the connecting parts is an even number, and the even number of the connecting parts are evenly spaced along the circumference of the shell.

[0014] Optionally, the battery cell is a cylindrical battery cell, the axial length of the battery cell is a first length, and the axial length of the shell along the battery cell is a second length; the second length is smaller than the first length, and the shell covers the groove of the battery cell along the axial direction of the battery cell.

[0015] Optionally, the battery cell is a cylindrical battery cell, the axial length of the battery cell is a first length, and the axial length of the shell along the battery cell is a second length; the second length is greater than or equal to the first length, and the shell completely covers the battery cell along the axial direction of the battery cell.

[0016] Optionally, the shell includes an annular side plate and a bottom plate, the bottom plate is connected to the annular side plate, and together with the annular side plate forms a cylindrical accommodating cavity with an opening, the battery cell is arranged in the cylindrical accommodating cavity, and the bottom of the battery cell abuts against the bottom plate.

[0017] Optionally, the bottom plate and the annular side plate are an integrally formed structure.

[0018] Optionally, the battery core is interference fit with the shell.

[0019] In a second aspect, the present application also discloses a battery pack, which includes the battery as described above.

[0020] In a third aspect, the present application further discloses an electrical device, which includes the battery pack as described above.

[0021] In the embodiment of the present application, the shell of the battery is provided with a connection portion, and is welded to the groove of the battery cell through the connection portion. Since the shell is provided with a connection portion corresponding to the groove of the battery cell, the shell can be welded to the groove of the battery cell through the connection portion, thereby realizing the electrical connection between the shell and the battery cell. Compared with the contact fit or interference fit method, this welding connection method is non-detachable, the connection is more stable, and the internal resistance is smaller, which improves the current transfer efficiency of the battery, reduces the energy loss of the battery, and is conducive to extending the service life of the battery; in addition, since the recessed connection portion of the shell corresponds to the position of the groove of the battery cell, after the two are welded, the welding point is located at the recessed position of the shell connection portion facing the battery cell, which avoids the welding point protruding from the shell, does not affect the outer diameter of the entire battery, and also ensures the appearance of the structure after labeling.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of the structure of the battery described in the embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of a battery according to an embodiment of the present application;

[0026] Figure 3 yes Figure 2 The enlarged schematic diagram of the middle A part;

[0027] Figure 4 It is one of the exploded schematic diagrams of the battery described in the embodiment of the present application;

[0028] Figure 5 This is the second explosion diagram of the battery described in the embodiment of the present application;

[0029] Figure 6 This is the third explosion diagram of the battery described in the embodiment of the present application;

[0030] Figure 7 It is a schematic diagram of the label of the battery described in the embodiment of the present application.

[0031] Figure numerals: 10 - battery cell; 11 - groove; 20 - housing; 21 - connecting portion; 211 - notch; 212 - bending portion; 30 - plastic bracket assembly; 40 - label; L1 - first length; L2 - second length. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] 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 a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The embodiment of the present application provides a battery, specifically a lithium battery, and further, it can be at least one of a cylindrical battery, a square battery, and a soft-pack battery. The embodiment of the present application does not limit the specific type of the battery. The embodiment of the present application arranges the shell outside the battery cell so that the connecting part of the shell is opposite to the groove of the battery cell, and welds the connecting part of the shell to the groove of the battery cell by welding, thereby strengthening the connection strength between the shell and the battery cell and reducing the internal resistance between the shell and the battery cell.

[0037] Reference Figure 1 , showing a schematic diagram of the structure of the battery described in the embodiment of the present application, referring to Figure 2 , showing a cross-sectional view of the battery described in the embodiment of the present application, referring to Figure 3 , showing Figure 2 The enlarged schematic diagram of the middle A part, refer to Figure 4 , showing one of the explosion diagrams of the battery described in the embodiment of the present application, referring to Figure 5 , showing the second explosion schematic diagram of the battery described in the embodiment of the present application, referring to Figure 6 , shows the third explosion schematic diagram of the battery described in the embodiment of the present application, such as Figures 1 to 6 As shown, the battery provided in the embodiment of the present application may specifically include: a battery cell 10 and a shell 20; wherein, the outer surface of the battery cell 10 is provided with a groove 11 recessed toward the inside of the battery cell 10, the shell 20 is sleeved on the outside of the battery cell 10 and at least partially covers the groove 11, and the shell 20 is provided with a connecting portion 21 at a position corresponding to the groove 11, and the connecting portion 21 is at least partially recessed toward one side of the battery cell 10 and abuts against the groove 11.

[0038] Specifically, the battery cell 10 can be a capacitive battery cell, and the groove 11 is formed by rolling the battery cell 10 toward the inside of the battery cell. When the battery cell 10 is a cylindrical battery cell, the battery cell 10 includes two ends that are arranged in opposite directions along the axial direction. The positive pole ear of the battery cell 10 is led out from one end of the battery cell 10. During assembly, the positive pole cap and the positive pole ear are welded to form the positive pole of the battery cell 10; the rolling operation of the battery cell 10 can be performed before or after the liquid is injected. The rolling of the battery cell 10 can form the groove 11, thereby fixing the winding core in the battery cell 10. Among them, the position of the groove 11 is arranged close to the positive pole of the battery cell 10, and the connecting portion 21 is recessed in the direction of the battery cell 10. The shell 20 can be sleeved on the battery cell 10 from the top of the battery cell 10. After the shell 20 is sleeved on the outside of the battery cell 10, the shell 20 can at least partially cover the groove 11, so that the shape and position of the connecting portion 21 can be adapted to the groove 11 on the battery cell 10, thereby providing conditions for welding between the shell 20 and the battery cell 10. It should be noted that when the battery is a cylindrical battery, the cross-section of the battery cell 10 is circular, and the center of the battery cell 10 is the center of the circle. When the battery is a square battery or a soft-pack battery, the cross-section of the battery cell 10 is rectangular, and the center of the battery cell 10 is the center point of the rectangular cross-section.

[0039] Furthermore, a limiting portion may be provided on the shell 20 . After the shell 20 is sleeved on the battery cell 10 , the top of the battery cell 10 abuts against the limiting portion, and at this time, the connecting portion 21 of the shell 20 is just opposite to the groove 11 of the battery cell 10 .

[0040] In practical applications, the connection portion 21 of the shell 20 can be welded to the groove 11 of the battery cell 10 by welding, so that the internal resistance between the shell 20 and the battery cell 10 can be reduced. Since the shell 20 and the battery cell 10 are non-detachably connected after welding, the connection strength between the shell 20 and the battery cell 10 is strengthened, which is conducive to ensuring product quality. In addition, when welding the shell 20 and the battery cell 10, the welding temperature and welding speed will also have a certain influence on the size of the welding point. Due to the influence of the welding process, the welding points between different battery cells 10 and different positions of the same battery cell 10 may have different sizes, which will affect the appearance of the product to a certain extent. The connection portion 21 is set to be at least partially concave toward one side of the battery cell 10. When welding the shell 20 and the battery cell 10, the welding point can be set at the concave position on the connection portion 21, thereby avoiding the influence of the uncertainty of the welding point size on the outer diameter of the battery and ensuring product quality.

[0041] In the embodiment of the present application, the connection portion 21 is provided with a notch 211 and a bent portion 212 extending and bent from the notch 211 toward one side of the battery cell 10 , and the bent portion 212 abuts against the groove 11 .

[0042] Specifically, the notch 211 of the connecting portion 21 is a through hole opened on the shell 20 and is on the same surface as the shell 20. The bending portion 212 extends and bends toward one side of the battery cell 10, so the bending portion 212 is actually recessed in the outer surface of the shell 20. The bending portion 212 is used for welding with the groove 11 of the battery cell 10.

[0043] It can be understood that when the connecting portion 21 is set on the shell 20, a notch 211 is set at a position corresponding to the connecting portion 21. Since the notch 211 is a through hole opened on the shell 20, it is convenient for the operator to determine the position of the welding point. The operator can pass the electrode through the notch 211 and place it on the bending portion 212 to perform welding operations. Since the bending portion 212 extends and bends toward one side of the battery cell 10, it will not affect the appearance of the shell 20.

[0044] In practical applications, resistance welding or laser welding, or other welding methods can be used when welding the shell 20 and the battery cell 10. Among them, the heat generated by resistance welding during the welding process is relatively concentrated, so the welding quality is good, the joint is firm, the welding efficiency is high, and it is suitable for the quantitative production of products. In addition, resistance welding does not require welding wires, welding rods and other welding materials, and the operation is simple, easy to achieve mechanization and automation, which is conducive to controlling material and labor costs; laser welding has high welding accuracy, and the high energy density of the laser beam can quickly heat and cool metal materials, thereby speeding up the welding speed. In addition, laser welding can reduce the diffusion of heat around the welding area, thereby reducing the size of the heat-affected zone, which is conducive to maintaining the original performance and material properties of the battery cell 10 and the shell 20.

[0045] In the embodiment of the present application, the connecting portion 21 and the housing 20 are an integrally formed structure.

[0046] Specifically, the shell 20 can be a steel shell, specifically, nickel steel or stainless steel, so that it can have high hardness and strength, and can effectively protect the positive and negative electrodes and electrolyte inside the battery. The connecting portion 21 is formed by stamping the steel shell, and a punching hole is formed in the steel shell after stamping, and a part is retained to maintain connection with the shell 20, and the disconnected part is bent toward one side of the battery cell 10 for welding with the battery cell 10.

[0047] The use of stamping to process the shell 20 can achieve high-speed and mass production, which is conducive to improving production efficiency. In addition, when the structure of the battery cell 10 is small, the size of the shell 20 is correspondingly small. The use of stamping processing technology size can ensure the accuracy and stability of the processed workpiece, which is conducive to ensuring the position accuracy of the connection part 21 and the consistency of product quality. When multiple connection parts 21 are provided on the shell 20, the multiple connection parts 21 are evenly distributed, which is conducive to ensuring the uniform connection strength of the battery cell 10 at various locations in the circumferential direction when the battery cell 10 is subjected to external force, thereby ensuring product quality.

[0048] In some optional embodiments of the present application, the battery cell 10 is a cylindrical battery cell 10 , and the groove 11 is an annular groove extending continuously along the circumference of the battery cell 10 .

[0049] The cylindrical battery cell 10 includes two ends that are axially divergent from each other. The positive electrode ear of the battery cell 10 is led out from one end of the battery cell 10. During assembly, the positive electrode cap and the positive electrode ear are welded to form the positive electrode of the battery cell 10. The rolling operation of the battery cell 10 can be performed before or after the liquid is injected. Continuously rolling the battery cell 10 in the circumferential direction can form an annular groove 11 that extends continuously in the circumferential direction of the battery cell.

[0050] It can be understood that when the battery cell 10 is a cylindrical battery cell 10, since its cross section is circular, and the connection portion 21 on the shell 20 is set at a certain position on the circumference of the shell 20, if the groove 11 of the battery cell 10 is not a continuous annular structure, it is not convenient to match the position of the connection portion 21 of the shell 20 with the groove 11 when assembling the shell 20 and the battery cell 10. However, the groove 11 is set as an annular groove 11 and extends continuously along the circumference of the battery cell 10, so the operator can put the shell 20 on the battery cell 10 from any direction, and it can be ensured that the connection portion 21 of the shell 20 can be opposite to the position of the annular groove 11.

[0051] Accordingly, in the embodiment of the present application, the shell 20 is a cylindrical shell 20 , and there are multiple connecting parts 21 , which are arranged at intervals along the circumference of the shell 20 .

[0052] Specifically, when resistance welding is used between the shell 20 and the battery cell 10, since the two poles of the resistance welding machine need to be pressed against the connecting parts 21, the number of connecting parts 21 can be set to an even number. For example, the number of connecting parts 21 can be set to 2, 4, 6, etc. It can be understood that when multiple connecting parts 21 are arranged along the circumference of the shell 20, there can be more welding positions between the shell 20 and the battery cell 10, thereby enhancing the connection strength between the shell 20 and the battery cell 10.

[0053] In practical applications, the spacing between welds will affect the welding quality. For example, when multiple welds are concentrated in a local area, deformation and cracks of the workpiece may occur easily. Therefore, when designing the spacing between adjacent connecting parts 21, the influence of the weld size and the size of the shell 20 must also be considered to ensure the welding quality.

[0054] In the embodiment of the present application, the number of the connection parts is an even number, and the even number of connection parts 21 are evenly spaced along the circumference of the shell 20 .

[0055] For example, the number of the connection parts 21 can be set to 2, 4, 6, etc. The present application does not specifically limit the specific number of the connection parts 21, and it can be set according to actual needs. It can be understood that when the number of the connection parts 21 is an even number, since the even number of connection parts 21 are evenly spaced along the circumference of the shell 20, the spacing between adjacent connection parts 21 is equal, and they can be symmetrically distributed in pairs on both sides of the circumference of the shell 20, so as to better fix the battery cell 10. In actual applications, this symmetrical distribution of the connection parts 21 is also conducive to the welding between the shell 20 and the battery cell 10.

[0056] It should be noted that, since the shell 20 and the battery cell 10 are mainly connected by welding between the two in the embodiment of the present application, the multiple connecting parts 21 are evenly spaced along the circumference of the shell 20, which can ensure that the connection strength with the battery cell 10 along the circumference of the shell 20 is more uniform, thereby ensuring the connection effect between the shell 20 and the battery cell 10.

[0057] In an optional embodiment of the present application, the battery cell 10 is a cylindrical battery cell 10, the axial length of the battery cell 10 is a first length L1, and the axial length of the shell 20 along the battery cell 10 is a second length L2; the second length L2 is less than the first length L1, and the shell 20 covers the groove 11 of the battery cell 10 along the axial direction of the battery cell 10.

[0058] Specifically, Figure 4 As shown, the first length L1 is the length of the battery core 10 along the axial direction. Figure 5As shown, the second length L2 is the length of the shell 20 along the axial direction of the battery core 10, wherein the second length L2 is less than the first length L1, and the second length L2 is sufficient to cover the groove 11 of the battery core 10, so that the connecting portion 21 provided on the shell 20 is sufficient to correspond to the annular groove 11 of the battery core 10, thereby providing conditions for welding between the shell 20 and the battery core 10. When the second length L2 of the shell 20 is small, the shell 20 can be a structure similar to a steel ring.

[0059] In practical applications, the length of the shell 20 is set shorter. Under the condition of meeting the requirement of electrical connection between the shell 20 and the battery cell 10, the material used for the shell 20 is reduced, the material cost of the shell 20 is reduced, and the competitiveness of the product is improved.

[0060] In another optional embodiment of the present application, the battery cell 10 is a cylindrical battery cell 10, the axial length of the battery cell 10 is a first length L1, and the axial length of the shell 20 along the battery cell 10 is a second length L2; the second length L2 is greater than or equal to the first length L1, and the shell 20 completely covers the battery cell 10 along the axial direction of the battery cell 10.

[0061] Specifically, Figure 5 As shown, the second length L2 is the length of the shell 20 along the axial direction of the battery cell 10, wherein the second length L2 may be greater than the first length L1, or may be equal to the first length L1. In practical applications, when the battery is a cylindrical battery, the cylindrical battery further includes a plastic bracket assembly 30 with a built-in circuit board, wherein the plastic bracket assembly 30 is connected to the top of the battery cell 10, and when the second length L2 is greater than the first length L1, the shell 20 may simultaneously cover the battery cell 10 and the plastic bracket assembly 30, thereby making the overall appearance of the battery better; when the second length L2 is equal to the first length L1, the shell 20 may completely cover the battery cell 10 along its length direction, or cover the plastic bracket assembly 30 and part of the battery cell 10, and the length design of the shell 20 may be adjusted according to actual needs.

[0062] In the embodiment of the present application, the shell 20 includes an annular side plate and a bottom plate, the bottom plate is connected to the annular side plate, the bottom plate can be correspondingly set to a circular shape, and together with the annular side plate, form a cylindrical accommodating cavity with an opening, the battery cell 10 is set in the cylindrical accommodating cavity, and the bottom of the battery cell 10 is abutted against the bottom plate, and the bottom plate is used to provide additional support for the battery cell 10.

[0063] Specifically, the annular side panel can be formed by stamping and bending steel or aluminum, and the bottom plate can be made of the same material as the annular side panel. Since the bottom plate does not need to be electrically connected to the battery cell 10, the bottom plate can also be made of other materials, such as PP material, PC material, or ceramic material, and then connected to the annular side panel. For example, the bottom plate and the annular side panel can be connected by bonding or welding.

[0064] Since the bottom plate and the annular side plate are enclosed to form a accommodating cavity, when the battery cell 10 is placed in the accommodating cavity, the bottom of the battery cell 10 can abut against the bottom plate. Therefore, the bottom plate can play a certain supporting role for the battery cell 10, further ensuring the connection strength and stability between the battery cell 10 and the shell 20.

[0065] In the embodiment of the present application, the bottom plate and the annular side plate are an integrally formed structure.

[0066] In practical applications, the bottom plate and the annular side plate can be made of steel and integrally formed by a stamping process. This integrally formed structure reduces the interface of the housing 20, has good structural integrity, and avoids the risk of battery breakage under vibration conditions. When the housing 20 is made by a stamping process, the stamping die can ensure the standardization of the process structure specifications, which is conducive to mass production of the product while ensuring the product yield. In practical applications, the processing method of the housing 20 can also be die-casting or extrusion molding, and this application does not specifically limit the processing technology of the housing 20.

[0067] In the embodiment of the present application, the battery cell 10 and the housing 20 are interference fit.

[0068] Specifically, the inner diameter of the shell 20 can be slightly smaller than the outer diameter of the battery cell 10. With respect to the size of the shell 20, the size of the shell 20 can be designed according to the material, thickness, elastic modulus, plastic modulus and other process characteristics of the shell 20 to meet the interference fit between the battery cell 10 and the shell 20. The shell 20 is designed to be interference fit with the battery cell 10, so that when the battery cell 10 and the shell 20 are assembled, the two not only rely on the welding between the connecting portion 21 of the shell 20 and the battery cell 10, but the interference fit between the two can also further prevent the battery cell 10 from shaking due to the gap between the shell 20 and the battery cell 10 under vibration conditions, thereby enhancing the connection stability between the shell 20 and the battery cell 10.

[0069] In the embodiment of the present application, the battery further includes a label 40, referring to Figure 7 , shows a schematic diagram of a label 40 of the battery described in the embodiment of the present application. As shown in the figure, the label 40 can be cylindrical to match the shape of the cylindrical battery. After the battery cell 10, the housing 20 and the plastic bracket assembly 30 of the battery are assembled to form a whole, the label 40 is attached to the outside of the battery. In practical applications, the label 40 can be made of PET, PVC, PC and other materials, and attached with strong glue. The label 40 can be printed with the characteristics of the battery to explain the product, and can also be printed with warning words to remind the user.

[0070] When assembling the battery, the plastic bracket assembly 30 can be inserted into the housing 20 to form a Figure 6The structure shown in the upper middle part is then integrally mounted on the battery cell 10 so that the connection portion 21 of the shell 20 is opposite to the groove 11 of the battery cell 10 , and then the shell 20 and the battery cell 10 are welded to electrically connect the shell 20 and the battery cell 10 .

[0071] In summary, in the embodiment of the present application, the shell of the battery is provided with a connection portion, and is welded to the groove of the battery cell through the connection portion. Since the shell is provided with a connection portion corresponding to the groove of the battery cell, the shell can be welded to the groove of the battery cell through the connection portion, thereby realizing the electrical connection between the shell and the battery cell. Compared with the contact fit or interference fit method, this welding connection method is non-detachable, the connection is more reliable and stable, and the internal resistance is smaller, which improves the battery current transfer efficiency, reduces the energy loss of the battery, and is conducive to extending the service life of the battery; in addition, since the recessed connection portion of the shell corresponds to the position of the groove of the battery cell, after the two are welded, the welding point is located at the recessed position of the shell connection portion facing the battery cell, which avoids the welding point protruding from the shell, will not affect the outer diameter of the entire battery, and also ensures the appearance of the structure after labeling.

[0072] The present application also discloses a battery pack, which includes the battery as described above.

[0073] The present application also discloses an electrical device, which includes the battery pack as described above.

[0074] It should be noted that in the embodiment of the present application, the battery pack and the electrical equipment both include the battery as described above, and therefore have similar beneficial effects as the above-mentioned battery, which will not be described in detail here.

[0075] 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.

[0076] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that: include: Battery cell and shell; wherein, The outer surface of the battery cell is provided with a groove recessed toward the inside of the battery cell, the shell is sleeved on the outside of the battery cell and at least partially covers the groove, the shell is provided with a connecting portion at a position corresponding to the groove, the connecting portion is at least partially recessed toward one side of the battery cell and abuts against the groove.

2. The battery according to claim 1, characterized in that The connecting portion is provided with a notch and a bent portion extending and bent from the notch toward one side of the battery core, and the bent portion abuts against the groove.

3. The battery according to claim 2, characterized in that The connecting portion and the housing are integrally formed.

4. The battery according to claim 1, characterized in that The battery core is a cylindrical battery core, and the groove is an annular groove extending continuously along the circumference of the battery core.

5. The battery according to claim 4, characterized in that The battery cell comprises two ends which are arranged in opposite directions along the axial direction, a positive electrode ear of the battery cell is led out from one of the two ends to form a positive electrode of the battery cell, and the groove is arranged close to the positive electrode.

6. The battery according to claim 5, characterized in that The shell is a cylindrical shell, the number of the connecting parts is multiple, and the multiple connecting parts are arranged at intervals along the circumference of the shell.

7. The battery according to claim 6, characterized in that The number of the connection parts is an even number, and the even number of the connection parts are evenly spaced along the circumference of the shell.

8. The battery according to claim 1, characterized in that The battery cell is a cylindrical battery cell, the axial length of the battery cell is a first length, and the axial length of the shell is a second length; the second length is smaller than the first length, and the shell covers the groove of the battery cell along the axial direction of the battery cell.

9. The battery according to claim 1, characterized in that The battery cell is a cylindrical battery cell, the axial length of the battery cell is a first length, and the axial length of the shell is a second length; the second length is greater than or equal to the first length, and the shell completely covers the battery cell along the axial direction of the battery cell.

10. The battery according to claim 1, characterized in that The shell includes an annular side plate and a bottom plate, the bottom plate is connected to the annular side plate, and together with the annular side plate, forms a cylindrical accommodating cavity with an opening, the battery cell is arranged in the cylindrical accommodating cavity, and the bottom of the battery cell abuts against the bottom plate.

11. The battery according to claim 10, characterized in that The bottom plate and the annular side plate are an integrally formed structure.

12. The battery according to claim 1, characterized in that The battery core is interference-fitted with the shell.

13. A battery pack, characterized in that: Comprising the battery according to any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 13.

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