Battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery and an electric device. The connecting sheet is electrically connected with the pole; one of the pole and the connecting piece is provided with a convex structure, and the other one is provided with a first groove; the convex structure is arranged in the first groove, a watchband contact finger is arranged between the outer peripheral surface of the convex structure and the first groove, and the watchband contact finger is electrically contacted with the outer peripheral surface of the convex structure and the groove side surface of the first groove. According to the battery provided by the utility model, the contact resistance of the connecting piece and the pole is minimized while the pole and the connecting piece are detachably connected in a plug-in manner.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially relates to a battery and electric device. BACKGROUND

[0002] The series connection or parallel connection of two batteries is realized through the gasket connection. In the prior art, the gasket is fixed on the pole of the battery through laser welding, so as to realize the fixed connection between the pole and the gasket. Thus, in the laser welding process, the temperature of the pole is increased, and the excessively high temperature of the pole can cause the upper plastic between the edge of the pole and the cover plate and used for sealing to melt, thereby affecting the sealing property between the cover plate and the pole, the risk of liquid leakage is high, and there is a safety risk of short circuit.

[0003] Therefore, there is an urgent need for a battery and electric device to solve the above problems. SUMMARY

[0004] The first purpose of the utility model is to provide a battery, which can not only realize the plug-in detachable connection of the pole and the connecting piece, but also minimize the contact resistance between the pole and the connecting piece.

[0005] According to the above idea, the technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a battery, which comprises:

[0007] A battery monomer has a pole;

[0008] A connecting piece is electrically connected with the pole;

[0009] Among the pole and the connecting piece, one is provided with a convex structure, and the other is provided with a first groove; the convex structure is placed in the first groove, a watchband contact finger is arranged between the outer peripheral surface of the convex structure and the first groove, and the watchband contact finger is in electrical contact with the outer peripheral surface of the convex structure and the groove side surface of the first groove.

[0010] Optionally, the watchband contact finger elastically abuts against the outer peripheral surface of the convex structure and the groove side surface of the first groove.

[0011] Optionally, the watchband contact finger comprises two main body parts and a plurality of contact finger parts, the two main body parts are oppositely arranged along the thickness direction of the pole; the plurality of contact finger parts are arranged at intervals along the extension direction of the main body part, and the plurality of contact finger parts are located between the two main body parts; the plurality of contact finger parts are connected with the two main body parts; among the main body part and the contact finger part, one elastically abuts against the groove side surface of the first groove, and the other elastically abuts against the outer peripheral surface of the convex structure.

[0012] Optionally, a rotation-stopping portion is arranged on the groove side of the first groove, and the outer circumferential surface of the protruding structure is provided with a rotation-stopping groove corresponding to the rotation-stopping portion, and the rotation-stopping portion and the rotation-stopping groove are inserted and fitted.

[0013] Optionally, one rotation-stopping portion is arranged, and the watchband contact finger has first and second ends arranged oppositely along the extending direction of the watchband contact finger, the first and second ends of the watchband contact finger are located on two sides of the rotation-stopping portion, and the first and second ends of the watchband contact finger are in abutment with the rotation-stopping portion.

[0014] Alternatively,

[0015] The rotation-stopping portion is provided with a plurality of rotation-stopping portions arranged at intervals in the circumferential direction, and the watchband contact finger is arranged between two adjacent rotation-stopping portions, and the watchband contact finger has first and second ends arranged oppositely along the extending direction of the watchband contact finger, and the first and second ends of the watchband contact finger are in abutment with the two adjacent rotation-stopping portions, respectively.

[0016] Alternatively,

[0017] The rotation-stopping portion is provided with a plurality of rotation-stopping portions arranged at intervals in the circumferential direction, and the watchband contact finger is provided with an avoiding opening corresponding to the rotation-stopping portion, and the avoiding opening and the rotation-stopping portion are inserted and fitted.

[0018] Optionally, the pole column has a first end surface arranged towards the connecting sheet, and the first groove is arranged on the first end surface of the pole column, and the protruding structure is arranged on the side of the connecting sheet towards the pole column, and the slot opening area of the first groove is 12% to 56% of the area of the first end surface of the pole column.

[0019] Optionally, the battery monomer further comprises a transfer sheet, and the transfer sheet and the connecting sheet are located on two sides in the thickness direction of the pole column, respectively.

[0020] The pole column has a contact surface welded with the transfer sheet, and in the thickness direction of the pole column, the distance between the contact surface and the groove bottom surface of the first groove is b, and 0.5mm≤b≤3mm.

[0021] Or, in the thickness direction of the pole column, the distance between the contact surface and the groove bottom surface of the first groove is b, and the thickness of the pole column is d, wherein 2.5mm≤d≤4.5mm, and 13%≤b / d≤80%.

[0022] Or, in the thickness direction of the pole column, the distance between the contact surface and the groove bottom surface of the first groove is b, and the thickness of the pole column is d, wherein 5.5mm≤d≤7.5mm, and 8%≤b / d≤36%.

[0023] Optionally, the pole has a second end face opposite to the first end face along the thickness direction of the pole, and the second end face of the pole is provided with a second groove, and a bottom surface of the second groove is the contact surface.

[0024] Optionally, the battery monomer further comprises a sealing ring and an end cover, the pole comprises a pole portion and a base portion connected in sequence, the sealing ring is sleeved on the pole portion, and the sealing ring is arranged between the end cover and the base portion, wherein a surface of the pole portion away from the base portion is a first end face, a surface of the base portion away from the pole portion is a second end face, and a surface of the base portion abutting against the sealing ring is a sealing surface; in the thickness direction of the pole, the distance between the contact surface and the sealing surface is a, and the depth of the second groove is c, wherein 16% c≤a≤66% c.

[0025] And / or, the battery monomer further comprises a sealing ring and an end cover, and the sealing ring is arranged between the end cover and the second end face of the pole.

[0026] The utility model provides a battery and a power utilization device, and the battery comprises the battery monomer.

[0027] The battery and the power utilization device provided by the utility model have at least the following beneficial effects:

[0028] The battery of the utility model, in the pole and the connecting piece, one is provided with the convex structure, and the other is provided with the first recess; the convex structure is located in the first recess, that is, the pole and the connecting piece realize the plug-in type detachable connection; wherein, the outer circumferential surface of the convex structure and the groove wall of the first recess are provided with the watchband contact finger, and the watchband contact finger is electrically connected with the convex structure and the groove side surface of the first recess, so that the connecting piece and the pole can be electrically connected through the watchband contact finger, and the contact resistance of the connecting piece and the pole is minimized by using the watchband contact finger. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings by those skilled in the art without creating labor.

[0030] Figure 1 It is the structural schematic diagram of the battery monomer provided by the utility model;

[0031] Figure 2 It is the structural schematic diagram of part of the battery monomer provided by the utility model;

[0032] Figure 3Is the structure schematic view of the connecting piece provided by the utility model;

[0033] Figure 4 Is the structure schematic view of the battery provided by the utility model;

[0034] Figure 5 Is the sectional view of the battery monomer provided by the utility model;

[0035] Figure 6 Is the structure schematic view of the watchband contact finger in the expansion state provided by the utility model Figure 5 Is the enlarged view of A provided by the utility model;

[0036] Figure 7 Is the structure schematic view of the watchband contact finger in the bending state provided by the utility model;

[0037] Figure 8 Is the structure schematic view of the watchband contact finger in the bending state provided by the utility model;

[0038] Figure 9 Is the structure schematic view of the pole provided by the utility model;

[0039] Figure 10 Is the sectional view of the battery monomer provided by the utility model;

[0040] Figure 11 Is the enlarged view of C provided by the utility model Figure 10 Is the enlarged view of B provided by the utility model.

[0041] Figure 12 Is the structure schematic view of the pole provided by the utility model;

[0042] Figure 13 Is the sectional view of the battery monomer provided by the utility model;

[0043] Figure 14 Is the enlarged view of B provided by the utility model Figure 13 Is the enlarged view of B provided by the utility model.

[0044] In the drawing,

[0045] 10, battery monomer;1, shell;2, pole;21, first recess;211, first groove bottom surface;22, rotation stopping portion;23, first end face;24, contact surface;25, second end face;26, second recess;27, sealing surface;28, column portion;29, base portion;3, watchband contact finger;31, main body portion;32, contact finger portion;321, contact finger surface;33, first end portion;34, second end portion;4, connecting piece;41, protruding structure;411, rotation stopping groove;5, adapter piece;51, boss;6, sealing ring;7, end cover;8, electric core. Specific implementation

[0046] To make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are merely used to explain the utility model and not limit the utility model. In addition, it should be noted that only parts related to the utility model are shown in the drawings for the convenience of description.

[0047] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0049] In the utility model, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the embodiment, if not specially stated, "a plurality of" specifically refers to two or more than two.

[0050] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0051] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element.

[0052] The technical solutions of the utility model are further illustrated below in combination with the drawings and through specific embodiments.

[0053] In a first aspect, the embodiment provides a battery capable of reducing the risk of liquid leakage and having high safety.

[0054] It should be noted that the battery in the embodiment can be a battery module, and the battery module herein refers to including a plurality of battery monomers, or can be a battery pack, and the battery pack herein refers to including a plurality of battery modules, each battery module including a plurality of battery monomers, and the embodiment does not limit this.

[0055] Embodiment one

[0056] Exemplarily, as shown in Figures 1 to 4 , the battery includes a battery monomer 10 and a connecting piece 4. The battery in the embodiment includes one or more battery monomers 10, wherein, Figure 1 is a schematic view of the battery including one battery monomer 10, Figure 4 is a schematic view of the battery including four battery monomers 10. The connecting piece 4 can also be called a tab or a busbar, and is used for input and output of current in the battery monomer 10.

[0057] In the embodiment, the battery monomer 10 has a pole 2, and the connecting piece 4 is electrically connected with the pole 2. Two poles 2 with different polarities between two adjacent battery monomers 10 are electrically connected through the connecting piece 4 to realize series connection of the two battery monomers 10, and two poles 2 with the same polarity between two adjacent battery monomers 10 are electrically connected through the connecting piece 4 to realize parallel connection of the two battery monomers 10.

[0058] Among the pole 2 of one battery monomer 10 and one connecting piece 4, one is provided with a protruding structure 41, and the other is provided with a first groove 21. The protruding structure 41 is placed in the first groove 21.

[0059] It can be understood that the pole 2 of the battery monomer 10 is provided with the protruding structure 41, and correspondingly, the connecting piece 4 is provided with the first groove 21; or the pole 2 of the battery monomer 10 is provided with the first groove 21, and correspondingly, the connecting piece 4 is provided with the protruding structure 41. The pole 2 of the battery monomer 10 and the connecting piece 4 are detachably connected in a plug-in mode through the protruding structure 41 and the first groove 21, and such a connection mode, on the one hand, facilitates subsequent replacement or maintenance of the battery monomer 10, and on the other hand, also avoids problems generated when laser welding connects the pole 2 and the connecting piece 4.

[0060] Continuation Figure 5 and Figure 6As shown in FIG. 1 and FIG. 2, the outer circumferential surface of the protruding structure 41 is opposite to the groove side surface of the first groove 21, and the watchband contact finger 3 is arranged between the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, and the watchband contact finger 3 is in electrical contact with both the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21.

[0061] In the present embodiment, by means of the watchband contact finger 3, while ensuring that the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21 are in contact to achieve electrical connection, the problem of large contact resistance caused by direct contact between the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21 when the protruding structure 41 and the first groove 21 are plugged together is solved, that is, the contact resistance is minimized while ensuring plug-in detachable connection.

[0062] It should be noted that, in order to ensure that the protruding structure 41 and the first groove 21 are plugged together, the shape of the protruding structure 41 matches the shape of the first groove 21, for example, as shown in Figure 2 and Figure 3 The protruding structure 41 and the first groove 21 are both cylindrical, which can facilitate the manufacture of the protruding structure 41 and the first groove 21. It can be understood that the shapes of the protruding structure 41 and the first groove 21 can also be prismatic, conical, circular truncated cone, prismatic, etc., which are not limited in the present embodiment.

[0063] It should also be noted that, in order to minimize the volume of the battery occupying the automobile chassis, the first groove 21 in the present embodiment is arranged on the pole 2, and the protruding structure 41 is arranged on the connecting piece 4. Specifically, as shown in Figure 2 and Figure 3 The pole 2 has a first end surface 23 arranged towards the connecting piece 4, and the first groove 21 is arranged on the first end surface 23 of the pole 2; the protruding structure 41 is arranged on the side of the connecting piece 4 facing the pole 2, and it is required that when the protruding structure 41 is placed in the first groove 21, the side of the connecting piece 4 facing the battery monomer 10 and the side of the pole 2 of the battery monomer 10 facing the connecting piece 4 can be in contact.

[0064] In some optional embodiments, in order to ensure the stability of the connection between the connecting piece 4 and the pole 2 of the battery cell 10, the watchband contact finger 3 elastically abuts against the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21. In this way, on the one hand, the watchband contact finger 3 is tightly abutted between the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, so that the connecting piece 4 and the pole 2 can be connected through the watchband contact finger 3 without the need to set other connection structures, that is, the watchband contact finger 3 is used for both the electrical connection between the connecting piece 4 and the pole 2 and the fixed connection between the connecting piece 4 and the pole 2, realizing the multi-use of the watchband contact finger 3, so that the structure of the battery can be less and the cost of the battery structure is reduced; on the other hand, the watchband contact finger 3 elastically abuts against the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, so that the thickness of the watchband contact finger 3 can be adjusted within a certain range, and then the thickness of the watchband contact finger 3 can not be exactly equal to the distance between the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, for example, the thickness of the watchband contact finger 3 can be slightly greater than the distance between the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, which reduces the precision requirement for the thickness of the watchband contact finger 3 and the difficulty of manufacturing the watchband contact finger 3. From another angle, the watchband contact finger 3 can compensate for the size deviation of the protruding structure 41 and the first groove 21, thereby reducing the size precision requirement of the protruding structure 41 and the first groove 21, and then reducing the manufacturing difficulty of the pole 2 and the connecting piece 4.

[0065] Of course, it can be understood that the watchband contact finger 3 can also be in interference fit with the outer circumferential surface of the protruding structure 41 and in interference fit with the groove side surface of the first groove 21, which is not limited in the present embodiment.

[0066] Since the watchband contact finger 3 only needs to elastically abut against the outer circumferential surface of the protruding structure 41 and the groove side surface of the first groove 21, the structure of the watchband contact finger 3 can have various forms. Specifically, as shown in Figure 7 and Figure 8 The watchband contact finger 3 includes two main body parts 31 and a plurality of contact finger parts 32. The two main body parts 31 are arranged in the depth direction of the first groove 21, and the plurality of contact finger parts 32 are located between the two main body parts 31; the plurality of contact finger parts 32 are arranged in the extension direction of the main body part 31, and the plurality of contact finger parts 32 are connected to the two main body parts 31. In the main body part 31 and the contact finger part 32, one elastically abuts against the groove side surface of the first groove 21, and the other elastically abuts against the outer circumferential surface of the protruding structure 41, so as to realize the elastic abutment of the watchband contact finger 3 against the groove bottom wall of the first groove 21 and the outer circumferential surface of the protruding structure 41.

[0067] It can be understood that two ends of each of the finger portions 32 are connected with two body portions 31 respectively, so that the current can flow through the connecting tab 4, the body portions 31, the finger portions 32 and the pole 2, and thus the connecting tab 4 and the pole 2 can be electrically connected through the watchband finger 3.

[0068] In the embodiment, when the body portion 31 of the watchband finger 3 contacts the outer circumferential surface of the protruding structure 41, the finger portion 32 of the watchband finger 3 contacts the groove side surface of the first groove 21, and when the body portion 31 of the watchband finger 3 contacts the groove side surface of the first groove 21, the finger portion 32 of the watchband finger 3 contacts the outer circumferential surface of the protruding structure 41, wherein the finger portion 32 is provided in plurality and is arranged at intervals, so that the contact resistance between the pole 2 and the connecting tab 4 can be minimized while the current flow area between the pole 2 and the connecting tab 4 is ensured.

[0069] Specifically, in the embodiment, as shown in Figure 6 , the first groove 21 is arranged on the pole 2, the protruding structure 41 is arranged on the connecting tab 4, and the two body portions 31 are elastically abutted against the groove side surface of the first groove 21, and the plurality of finger portions 32 are elastically abutted against the outer circumferential surface of the protruding structure 41.

[0070] It should be noted that since the middle part of the finger portion 32 is protruded towards the direction of the outer circumferential surface of the protruding structure 41, when the finger portion 32 is pressed, the distance between the two body portions 31 can be increased, and the distance between the side of the body portion 31 which contacts the groove side surface of the first groove 21 and the side of the finger portion 32 which contacts the outer circumferential surface of the protruding structure 41 can be reduced, and thus the gap between the groove side surface of the first groove 21 and the outer circumferential surface of the protruding structure 41 can be better adapted to, so as to ensure that the watchband finger 3, the connecting tab 4 and the pole 2 are stably electrically connected and mechanically connected.

[0071] In order to further increase the contact area between the finger portion 32 and the outer circumferential surface of the protruding structure 41, in the embodiment, as shown in Figure 6 , the finger portion 32 has a flat finger surface 321, and the finger surface 321 abuts against the outer circumferential surface of the protruding structure 41 in a surface contact manner, so as to ensure a larger connection area.

[0072] It should be further noted that when the watchband finger 3 is not assembled into the battery, as shown in Figure 7 , the watchband finger 3 is flat. When the watchband finger 3 is assembled into the first groove 21, the watchband finger 3 needs to be bent into a shape matching the shape of the first groove 21, for example, the first groove 21 in the embodiment is a cylindrical groove, and at this time, as shown in Figure 8As shown, the watchband contact finger 3 needs to be bent into a ring shape, and since the plurality of contact finger portions 32 in this embodiment are arranged at intervals along the extension direction of the body portion 31, there is a gap between adjacent two contact finger portions 32, so that during the bending of the watchband contact finger 3, the contact finger portions 32 do not interfere with each other, ensuring that the watchband contact finger 3 can be successfully placed into the first groove 21. After the watchband contact finger 3 is placed into the first groove 21, the watchband contact finger 3 has a tendency to spread out into an elongated shape, so that under the action of the force for restoring the original shape of the watchband, the watchband contact finger 3 can tightly abut against the groove side surface of the first groove 21, and thus the problem of the watchband contact finger 3 falling out when it is inverted after being installed in the first groove 21 does not occur. Then, the protruding structure 41 is inserted into the first groove 21, specifically into the space formed by the watchband contact finger 3, so that the watchband contact finger 3 is clamped between the outer peripheral surface of the protruding structure 41 and the side wall surface of the first groove 21.

[0073] In some implementable embodiments, when the first groove 21 and the protruding structure 41 are both cylindrical, the watchband contact finger 3 will rotate relative to the first groove 21 or the protruding structure 41, and the protruding structure 41 will also rotate relative to the first groove 21, thereby affecting the connection of the connecting piece 4 to the two adjacent battery monomers 10.

[0074] Therefore, in order to solve the relative rotation of the protruding structure 41 and the first groove 21, Figure 2 and Figure 3 As shown, the groove side surface of the first groove 21 is provided with a rotation stopping portion 22, and the outer peripheral surface of the protruding structure 41 is provided with a rotation stopping groove 411 corresponding to the rotation stopping portion 22, the rotation stopping portion 22 and the rotation stopping groove 411 are inserted and matched to prevent the protruding structure 41 from rotating relative to the first groove 21, thereby preventing the relative rotation of the pole column 2 and the connecting piece 4.

[0075] It can be understood that, if only to solve the problem of the relative rotation of the protruding structure 41 and the first groove 21, the groove side surface of the first groove 21 can be designed to be provided with the rotation stopping groove 411, and the outer peripheral surface of the protruding structure 41 can be designed to be provided with the rotation stopping portion 22 corresponding to the rotation stopping groove 411.

[0076] It should be noted that, in order to facilitate the insertion of the rotation stopping portion 22 and the rotation stopping groove 411, in this embodiment, as shown in Figure 3 , when the first groove 21 is arranged at the pole column 2 and the protruding structure 41 is arranged at the connecting piece 4, the rotation stopping groove 411 extends along the axis direction of the protruding structure 41 and penetrates the protruding structure 41 towards one side of the groove bottom wall of the first groove 21, so that the rotation stopping portion 22 can be inserted along the axis direction of the protruding structure 41 with the rotation stopping groove 411, thereby reducing the assembly difficulty and improving the assembly efficiency.

[0077] It should be further noted that the number of rotation stopping portions 22 can be one or more, and correspondingly, the rotation stopping groove 411 can also be provided with one or more, which is not limited in this embodiment.

[0078] In some feasible embodiments, the watch strap finger 3 is accommodated within the first groove. To prevent the watch strap finger 3 from rotating relative to the first groove, when both the anti-rotation part 22 and the anti-rotation groove 411 are provided, such as... Figure 8 As shown, the watch strap finger 3 has a first end 33 and a second end 34 disposed opposite to each other along its extension direction. The first end 33 and the second end 34 of the watch strap finger 3 are located on both sides of the anti-rotation part 22, and both the first end 33 and the second end 34 of the watch strap finger 3 abut against the anti-rotation part 22. In this way, on the one hand, there is a gap between the first end 33 and the second end 34 of the watch strap finger 3, so that when the protruding structure 41 is inserted into the area formed by the watch strap finger 3, it will not break due to the internal stress generated inside the watch strap finger 3, thus ensuring the connection function of the watch strap finger 3; on the other hand, by providing the anti-rotation part 22, the position of the watch strap finger 3 in the first groove 21 can be limited, which facilitates the positioning and assembly of the watch strap finger 3 and prevents the watch strap finger 3 from rotating relative to the first groove 21.

[0079] In some alternative embodiments, when multiple anti-rotation portions 22 and anti-rotation grooves 411 are provided, the multiple anti-rotation portions 22 are arranged circumferentially spaced along the first groove 21, and each anti-rotation portion 22 is inserted into its corresponding anti-rotation groove 411. A watch strap finger 3 is provided between two adjacent anti-rotation portions 22, that is, multiple watch strap fingers 3 are provided. Each watch strap finger 3 has a first end 33 and a second end 34 arranged opposite to each other along its extending direction; the first end 33 and the second end 34 of the watch strap finger 3 respectively abut against two adjacent anti-rotation portions 22. In this way, positioning of each watch strap finger 3 can be achieved, and relative rotation between the connecting piece 4 and the pole post 2 can be prevented.

[0080] In some other optional embodiments, when multiple anti-rotation portions 22 and anti-rotation grooves 411 are provided, only one watch strap finger 3 may be provided. Specifically, multiple anti-rotation portions 22 are arranged at intervals along the circumference of the first groove 21. The watch strap finger 3 is provided with a clearance opening corresponding to the anti-rotation portion 22, that is, the number of clearance openings is the same as the number of anti-rotation portions 22. The clearance openings and anti-rotation portions 22 are correspondingly inserted and matched, so that the watch strap finger 3 and the anti-rotation portion 22 will not affect each other, and the number of watch strap fingers 3 can be reduced, reducing assembly steps and improving assembly efficiency. It should be noted that the length of the anti-rotation portion 22 in the axial direction of the pole post 2 is less than the length of the watch strap finger 3 in the axial direction of the pole post 2, and the clearance opening is located at the position of the watch strap finger 3 near the groove opening of the first groove 21.

[0081] In some alternative embodiments, such as Figure 6 As shown, the battery cell 10 also includes an adapter piece 5. The adapter piece 5 and the connecting piece 4 are located on both sides of the thickness direction of the electrode post 2, and the adapter piece 5 is connected to the side of the electrode post 2 away from the connecting piece 4.

[0082] Since the existing adapter plate 5 is connected with the pole 2 by laser welding, the expansion of the pole 2 caused by high temperature generated by laser welding is avoided, and the problem of the pole 2 cracking the plastic is avoided. Therefore, the slot area of the first groove 21 is 12% to 56% of the area of the first end surface 23 of the pole 2. While ensuring the structural strength of the pole 2 and the insertion of the first groove 21 and the protruding structure 41, the slot of the first groove 21 is designed so that the pole 2 and the adapter plate 5 can be connected by ultrasonic welding.

[0083] It should be noted that the slot area of the first groove 21 is 12% or 18% or 25% or 30% or 35% or 40% or 45% or 50% or 56% of the area of the first end surface 23 of the pole 2.

[0084] It should be further noted that when the pole 2 and the first groove 21 are both cylindrical, the difference between the diameter of the pole 2 and the diameter of the first groove 21 is greater than or equal to 3 mm, so as to ensure the structural stability of the pole 2. Specifically, the difference between the diameter of the pole 2 and the diameter of the first groove 21 can be 3 mm or 4 mm or 5 mm or 6 mm. Moreover, the diameter of the first groove 21 is greater than or equal to 4 mm, so as to facilitate ultrasonic welding of the pole 2 and the adapter plate 5. Specifically, the diameter of the first groove 21 is 4 mm or 5 mm or 6 mm or 7 mm. Moreover, the smaller the diameter of the pole 2 under the condition of meeting the overcurrent, the lower the cost. Generally, the diameter of the pole 2 is less than or equal to 12 mm. Specifically, the diameter of the pole 2 is 12 mm or 11 mm or 10 mm or 9 mm.

[0085] Since the adapter plate 5 and the pole 2 are connected by ultrasonic welding, the thickness of the welding position of ultrasonic welding cannot be too small or too large. When the thickness of the welding position of ultrasonic welding is too small, the welding position is prone to deformation, affecting the welding effect. When the thickness of the welding position of ultrasonic welding is too large, the ultrasonic welding power needs to be very large, increasing the energy consumption.

[0086] Therefore, there are three size designs as follows:

[0087] First, the pole 2 has a contact surface 24 for welding with the adapter plate 5. In the thickness direction of the pole 2, the distance between the contact surface 24 and the bottom surface of the first groove 21 is b, where 0.5 mm≤b≤3 mm. Specifically, in the thickness direction of the pole 2, the distance between the contact surface 24 and the bottom surface of the first groove 21 is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0088] It should be noted that the groove bottom surface of the first groove 21 is the action surface during ultrasonic welding, and the distance between the groove bottom surface of the first groove 21 and the contact surface 24 is the thickness of the welding position.

[0089] Secondly, the pole 2 has a contact surface 24 welded with the adapter piece 5, and when the thickness of the pole 2 is large, the distance between the contact surface 24 and the groove bottom surface of the first groove 21 is b, the thickness of the pole 2 is d, 5.5mm≤d≤7.5mm, and the relationship between the thickness of the pole 2 and b (i.e. the distance between the contact surface 24 and the groove bottom surface of the first groove 21 in the thickness direction of the pole 2) satisfies: 8%≤b / d≤36%.

[0090] Specifically, the thickness of the pole 2 is 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, etc. For example, when the thickness of the pole 2 is 6mm, 0.48mm≤b≤2.16mm, and then the value of b can be 0.5mm or 0.9mm or 1.2mm or 1.4mm or 1.7mm or 2.1mm.

[0091] For example, the assembly structure of the pole 2 and the end cover 7 suitable for the second size design is shown in FIG. 2B. Figure 6 The battery monomer 10 further comprises a sealing ring 6 and an end cover 7, and the pole 2 comprises a column part 28 and a base part 29 connected in sequence; the sealing ring 6 is sleeved on the column part 28; the column part 28 penetrates through the end cover 7, and the sealing ring 6 is clamped between the end cover 7 and the base part 29; wherein the side of the column part 28 facing the connecting piece 4 is a first end surface 23, the side of the base part 29 away from the connecting piece 4 is a contact surface 24 in contact with the adapter piece, and the first groove 21 is arranged on the first end surface 23 of the column part 28.

[0092] At this time, since the pole 2 needs to be provided with the first groove 21, and the pole 2 needs to reserve a length for the sealing ring 6 to be sleeved, the thickness of the pole 2 in the embodiment is large, and the distance between the contact surface 24 and the groove bottom surface of the first groove 21 needs to be determined according to the second size design.

[0093] Thirdly, the pole 2 has a contact surface 24 welded with the adapter piece 5, and when the thickness of the pole 2 is small, the thickness of the pole 2 is d, 2.5mm≤d≤4.5mm, and the relationship between the thickness of the pole 2 and b (i.e. the distance between the contact surface 24 and the groove bottom surface of the first groove 21 in the thickness direction of the pole 2) satisfies: 13%≤b / d≤80%.

[0094] Specifically, the thickness of the pole 2 is 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc. For example, when the thickness of the pole 2 is 3mm, 0.39mm≤b≤2.4mm, and then b can be 0.4mm or 0.7mm or 1.3mm or 1.5mm or 1.8mm or 2.1mm or 2.4mm.

[0095] For example, the assembly structure of the pole 2 and the end cover 7 suitable for the third size design is shown in FIG. 3. Figure 14 As shown, the battery cell 10 further includes a sealing ring 6 and an end cover 7, the pole 2 has a first end face 23 arranged towards the connecting piece 4 along the thickness direction of the pole 2, and a contact face 24 arranged away from the first end face 23, the contact face 24 of the pole 2 is in contact with the adapter piece 5, and the first groove 21 is arranged at the first end face 23 of the pole 2; the pole 2 is arranged at one side of the end cover 7, and the sealing ring 6 is clamped between the second end face 25 of the pole 2 and the end cover 7.

[0096] Therefore, the thickness of the pole 2 can be smaller, and the distance between the contact face 24 and the groove bottom face of the first groove 21 needs to be determined according to the third size design.

[0097] Embodiment Two

[0098] The difference between this embodiment and the first embodiment is that, as shown in FIG. 4, Figure 11 and Figure 14 the pole 2 has a second end face 25 arranged away from the first end face 23 along the thickness direction of the pole 2, the second end face 25 of the pole 2 is provided with a second groove 26, and the groove bottom face of the second groove 26 is the contact face 24 in contact with the adapter piece 5.

[0099] Specifically, in order to cooperate with the second groove 26, the adapter piece 5 is provided with a boss 51 extending into the second groove 26, and the boss 51 is arranged in the second groove 26 and in contact with the contact face 24.

[0100] In this embodiment, not only can the distance between the contact face 24 and the groove bottom face of the first groove 21 be controlled through the cooperation of the first groove 21 and the second groove 26, thereby ensuring ultrasonic welding, but also the adapter piece 5 can be positioned through the second groove 26, thereby facilitating connection.

[0101] In an implementable embodiment, as shown in FIG. 5, Figure 11As shown, the battery cell 10 further comprises a sealing ring 6 and an end cover 7, the pole 2 comprises a column part 28 and a base part 29 connected in sequence, and the sealing ring 6 is sleeved on the column part 28; the column part 28 penetrates through the end cover 7, and the sealing ring 6 is clamped between the end cover 7 and the base part 29, wherein a first end face 23 is arranged on a side of the column part 28 facing the connecting tab 4, a second end face 25 is arranged on a side of the base part 29 facing away from the connecting tab 4, the first recess 21 is arranged on the first end face 23 of the column part 28, and the second recess 26 is arranged on the second end face 25 of the base part 29, and a bottom surface of the second recess 26 is a contact surface 24 in contact with the adapter tab.

[0102] Since the second recess 26 and the first recess 21 are arranged on the pole 2 at the same time, in order to ensure that the adapter tab and the pole 2 can be ultrasonic welded and that the pole 2 and the connecting tab 4 are connected stably, the following size design is made:

[0103] A sealing surface 27 is arranged on a surface of the base part 29 abutting against the sealing ring 6, in the thickness direction of the pole 2, the distance between the contact surface 24 and the sealing surface 27 is a, the depth of the second recess 26 is c, and 16% c≤a≤66% c.

[0104] The relationship between a and c is such that the sealing performance of the sealing ring 6 is less affected when the adapter tab 5 and the pole 2 are ultrasonic welded. If 16% c>a, since the contact surface 24 is closer to the sealing surface 27, and the sealing ring 6 is usually assembled before the ultrasonic welding step, the vibration of welding will affect the sealing performance of the sealing ring 6, and further affect the sealing performance of the battery cell 10. If a>66% c, the adapter tab 5 needs to have a higher protrusion height matched with the second recess 26, which further affects the welding quality and reliability of the adapter tab 5 and the pole 2. For example, a=16% c, a=20% c, a=30% c, a=40% c, a=50% c, a=60% c, a=65% c, a=66% c, and the like, which will not be listed one by one in the embodiment.

[0105] Further, since the depth of the second recess 26 is equal to the distance between the contact surface 24 and the sealing surface 27 in the thickness direction of the pole 2 plus the thickness of the base part 29, the thickness of the base part 29 is t, and the thickness of the base part 29 and the depth of the second recess 26 satisfy: 1.2t≤c≤3t, and 0.2t≤a≤2t.

[0106] The other structures in the embodiment are similar to the corresponding structures in the first embodiment, and have similar beneficial effects, which will not be described herein.

[0107] Embodiment Three

[0108] The use device provided in the embodiment comprises the battery in the first or second embodiment, and has higher safety.

[0109] Exemplarily, the electric devices include, but are not limited to, mobile phones, portable devices, notebook computers, electric vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc., the electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc., the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planes.

[0110] It should be noted that the above are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A battery, characterized by, The battery cell (10) has a pole post (2), and a connecting piece (4) is electrically connected to the pole post (2). One of the pole post (2) and the connecting piece (4) is provided with a protruding structure (41), and the other is provided with a first groove (21); the protruding structure (41) is arranged in the first groove (21), and a watchband contact finger (3) is arranged between the outer circumferential surface of the protruding structure (41) and the first groove (21), and the watchband contact finger (3) is in electrical contact with the outer circumferential surface of the protruding structure (41) and the groove side surface of the first groove (21). The watchband contact finger (3) elastically abuts against the outer circumferential surface of the protruding structure (41), and the watchband contact finger (3) elastically abuts against the groove side surface of the first groove (21). The watchband contact finger (3) includes two main body parts (31) and a plurality of finger parts (32), the two main body parts (31) are oppositely arranged along the thickness direction of the pole post (2), the plurality of finger parts (32) are arranged at intervals along the extension direction of the main body part (31), and the plurality of finger parts (32) are located between the two main body parts (31); the plurality of finger parts (32) are connected to the two main body parts (31); one of the main body part (31) and the finger part (32) elastically abuts against the groove side surface of the first groove (21), and the other elastically abuts against the outer circumferential surface of the protruding structure (41).

2. The battery of claim 1, wherein, The groove side surface of the first groove (21) is provided with a rotation stopping part (22), the outer circumferential surface of the protruding structure (41) is provided with a rotation stopping groove (411) corresponding to the rotation stopping part (22), and the rotation stopping part (22) and the rotation stopping groove (411) are inserted and matched.

3. The battery of claim 2, wherein, The rotation stopping part (22) is provided with one, the watchband contact finger (3) has a first end part (33) and a second end part (34) oppositely arranged along the extension direction thereof, the first end part (33) and the second end part (34) of the watchband contact finger (3) are located on the two sides of the rotation stopping part (22), and the first end part (33) and the second end part (34) of the watchband contact finger (3) are in abutment with the rotation stopping part (22); 4. The battery according to any one of claims 1 to 3, characterized in that, Alternatively, 5. The battery of claim 4, wherein, The rotation stopping part (22) is provided with a plurality of rotation stopping parts (22) arranged at intervals in the circumferential direction; the watchband contact finger (3) is arranged between two adjacent rotation stopping parts (22), the watchband contact finger (3) has a first end part (33) and a second end part (34) oppositely arranged along the extension direction thereof; the first end part (33) and the second end part (34) of the watchband contact finger (3) are in abutment with the two adjacent rotation stopping parts (22), respectively; Alternatively, The rotation stopping part (22) is provided with a plurality of rotation stopping parts (22) arranged at intervals in the circumferential direction; the watchband contact finger (3) is provided with an avoiding opening corresponding to the rotation stopping part (22), and the avoiding opening and the rotation stopping part (22) are inserted and matched. ​ ​ 6. The battery according to any one of claims 1 to 3, wherein The pole column (2) has a first end face (23) arranged towards the connecting piece (4), and the first groove (21) is arranged at the first end face (23) of the pole column (2); the protruding structure (41) is arranged at one side of the connecting piece (4) towards the pole column (2), wherein the slot area of the first groove (21) is 12% to 56% of the area of the first end face (23) of the pole column (2).

7. The battery of claim 6, wherein, The battery monomer (10) further comprises a transition piece (5), and the transition piece (5) and the connecting piece (4) are respectively arranged on both sides of the thickness direction of the pole column (2). The pole column (2) has a contact face (24) welded with the transition piece (5), and the distance between the contact face (24) and the groove bottom face of the first groove (21) in the thickness direction of the pole column (2) is b, wherein 0.5mm≤b≤3mm. Or, the distance between the contact face (24) and the groove bottom face of the first groove (21) in the thickness direction of the pole column (2) is b, and the thickness of the pole column (2) is d, wherein 2.5mm≤d≤4.5mm, and 13%≤b / d≤80%. Or, the distance between the contact face (24) and the groove bottom face of the first groove (21) in the thickness direction of the pole column (2) is b, and the thickness of the pole column (2) is d, wherein 5.5mm≤d≤7.5mm, and 8%≤b / d≤36%.

8. The battery of claim 7, wherein, The pole column (2) has a second end face (25) arranged opposite to the first end face (23) along the thickness direction thereof, and the second end face (25) of the pole column (2) is provided with a second groove (26), and the groove bottom face of the second groove (26) is the contact face (24).

9. The battery of claim 8, wherein, The battery monomer (10) further comprises a sealing ring (6) and an end cover (7), the pole column (2) comprises a column part (28) and a base part (29) connected in sequence, the sealing ring (6) is sleeved on the column part (28), and the sealing ring (6) is arranged between the end cover (7) and the base part (29), wherein the surface of the column part (28) away from the base part (29) is the first end face (23), the surface of the base part (29) away from the column part (28) is the second end face (25), and the surface of the base part (29) abutting against the sealing ring (6) is a sealing face (27); in the thickness direction of the pole column (2), the distance between the contact face (24) and the sealing face (27) is a, and the depth of the second groove (26) is c, wherein 16%c≤a≤66%c; And / or, the battery monomer (10) further comprises a sealing ring (6) and an end cover (7), and the sealing ring (6) is arranged between the end cover (7) and the second end face (25) of the pole column (2).

10. An electrical device, characterized by The battery comprises the battery monomer as claimed in any one of claims 1-9.

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