Battery

Abstract

Battery characterized in that the battery has a battery body (100) and a first adapter piece (200); wherein the battery body (100) has a lower shell (110) and a cover plate component (120) attached to the lower shell (110); wherein the first adapter piece (200) comprises a welding pad (210) and an adapter (220), wherein the welding pad (210) is electrically connected to the adapter (220) and the cover plate component (120), wherein a first pin (221) is formed at an end of the adapter (220) facing away from the welding pad (210); and where the hardness of the welding pad (210) is less than the hardness of the adapter (220).

Description

Technical field

[0001] The present invention relates to the technical field of battery energy, in particular to a battery. State of the art

[0002] Because lithium-ion batteries have the advantages of high energy density, long cycle life and environmental friendliness, they are widely used in portable electronic products such as mobile phones and laptops, as well as new energy vehicles.

[0003] Currently, some batteries include a battery body, a first adapter, and a second adapter. The first adapter is welded to the cover plate component of the battery body, and the second adapter is welded to the battery body casing or the negative electrode casing cover. The first adapter is provided with a first pin, and the second adapter is provided with a second pin. The battery is connected to a mating circuit board via the first pin and the second pin to provide external power.

[0004] However, the first pin becomes slightly deformed, which means that it cannot be connected to the appropriate circuit board and the battery is therefore scrapped. Brief summary of the utility model

[0005] On this basis, the present invention provides a battery to solve the problem in the prior art that the first pin is easily deformed and cannot be connected to a mating circuit board, resulting in the battery being scrapped.

[0006] The battery provided by the present invention comprises a battery body and a first adapter piece; wherein the battery body comprises a lower shell and a cover plate component mounted on the lower shell; wherein the first adapter piece comprises a welding pad and an adapter, wherein the welding pad is electrically connected to the adapter and the cover plate component, wherein a first pin is formed at an end of the adapter facing away from the welding pad; and where the hardness of the welding pad is smaller than the hardness of the adapter.

[0007] In one possible embodiment, the hardness of the adapter is HV300-HV370; and / or The hardness of the welding pad is HV130-HV230.

[0008] In one possible embodiment, it is provided that the welding pad is welded and connected to the adapter, wherein a first welding mark is formed between the welding pad and the adapter; wherein the outer diameter of the first weld mark is 4 mm to 6 mm; and / or wherein the first weld mark penetrates the adapter and is fused into the weld pad, wherein the depth of fusion of the first weld mark into the weld pad is 0.05 mm-1 mm; and / or wherein the width of the first weld mark is 0.2 mm to 0.5 mm.

[0009] In one possible embodiment, it is provided that the adapter is provided with a window directly opposite the welding pad, wherein the window penetrates the adapter, wherein a projection protrudes from the welding pad, wherein the projection extends into the window.

[0010] In one possible embodiment, it is provided that the end of the projection is arranged in the thickness direction of the welding pad within the window, wherein the distance between the end of the projection and a side of the adapter facing away from the cover plate component is 0.02 mm to 0.05 mm; and / or wherein the shape of the window is circular, the diameter of the window being 1 mm to 3 mm.

[0011] In one possible embodiment, it is provided that the adapter is provided with a window directly opposite the welding pad, wherein a second welding mark is formed between the welding pad and the cover plate component, and wherein a projection of the second welding mark in the thickness direction of the welding pad lies within the window.

[0012] In one possible embodiment, it is provided that the shape of the second welding mark is circular, wherein the diameter of the second welding mark is 0.8 mm to 1.5 mm; and / or wherein the second weld mark penetrates the weld pad and is fused into the cover plate component, the depth of the second weld mark fused into the cover plate component being 0.05 mm-0.1 mm.

[0013] In one possible embodiment, it is provided that a first welding mark is formed between the welding pad and the adapter, wherein a projection of the first welding mark in the thickness direction of the welding pad is arranged outside a projection of the second welding mark in the thickness direction of the welding pad.

[0014] In one possible embodiment, it is provided that a first welding mark is formed between the welding pad and the adapter, wherein a first distance is formed between the projection of the first welding mark in the thickness direction of the welding pad and the projection of the second welding mark in the thickness direction of the welding pad, wherein the width of the first distance is 1.6 mm-2.625 mm.

[0015] In one possible embodiment, it is provided that a first welding mark is formed between the welding pad and the adapter, wherein the projection of the first welding mark in the thickness direction of the welding pad and the projection of the second welding mark in the thickness direction of the welding pad are arranged in concentric circles.

[0016] In one possible embodiment, the welding pad and the adapter are formed as a single piece.

[0017] In one possible embodiment, it is provided that the cover plate component comprises a cover plate mounted on the lower shell and a sealing piece mounted on the cover plate, wherein the cover plate is connected to the lower shell in an insulated and sealed manner, wherein the sealing piece is electrically connected to the cover plate and the welding pad, and wherein a third welding mark is formed between the sealing piece and the cover plate.

[0018] In one possible embodiment, it is provided that a second welding mark is formed between the welding pad and the sealing piece, wherein a projection of the third welding mark in the thickness direction of the welding pad is arranged outside a projection of the second welding mark in the thickness direction of the welding pad.

[0019] In one possible embodiment, it is provided that a second welding mark is formed between the welding pad and the sealing piece, wherein a second distance is formed between the projection of the third welding mark in the thickness direction of the welding pad and the projection of the second welding mark in the thickness direction of the welding pad, wherein the width of the second distance is 0.55 mm - 0.625 mm.

[0020] In one possible embodiment, it is provided that a second welding mark is formed between the welding pad and the sealing piece, wherein the projection of the third welding mark in the thickness direction of the welding pad and the projection of the second welding mark in the thickness direction of the welding pad are arranged in concentric circles.

[0021] In one possible embodiment, it is provided that the battery further comprises an insulating element, wherein the insulating element comprises a first insulating part and a second insulating part, wherein the first insulating part is arranged between the cover of the lower shell and the adapter, wherein the second insulating part is arranged between the side wall of the lower shell and the first pin.

[0022] In one possible embodiment, it is provided that the insulating element further comprises a connecting portion which is connected between the first insulating part and the second insulating part, wherein a recess is provided on each of two opposite sides of the connecting portion.

[0023] In the battery provided by this invention, its first adapter piece can be electrically connected to the cover plate component of the battery body. The first adapter piece includes a welding pad and a first adapter, wherein a first pin is formed at an end of the adapter facing away from the welding pad, and the hardness of the welding pad is lower than the hardness of the adapter. The material of the welding pad can be nickel or aluminum, which offers good welding performance with the cover plate component, wherein the material of the adapter has a higher hardness, for example, stainless steel. In this way, the first adapter piece can be reliably welded to the cover plate component of the battery body. At the same time, the first pin is less likely to deform, thereby reducing the risk of the battery being scrapped because it cannot be welded to a matching circuit board due to the deformation of the first pin. Short description of the characters

[0024] In order to more clearly explain the technical solutions of the embodiments of the present invention or the prior art, the drawings necessary for the descriptions of the embodiments or the prior art are briefly described below. Obviously, the accompanying drawings in the following description represent only some embodiments of the present invention, and those skilled in the art can also derive other drawings from these drawings without creative effort. Fig. 1 is a schematic structural diagram of a battery provided by an embodiment of the present invention; Fig. 2 is an exploded view of a battery provided by an embodiment of the present invention; Fig. 3 is a schematic structural diagram of a first adapter piece provided by an embodiment of the present invention; Fig. 4 is a sectional view of the first adapter piece along the line AA in Fig. 3; Fig. Figure 5 is a partially enlarged schematic representation of point B in Fig. 4; Fig. 6 is a plan view of a battery provided by an embodiment of the present invention; Fig. 7 is a sectional view of the battery along the line CC in Fig. 6; Fig. Figure 8 is a partially enlarged schematic representation at location D in Fig. 7. List of reference symbols

[0025] 100. Battery body; 110. Lower shell; 111. Cover; 120. Cover plate component; 121. Cover plate; 122. Sealing piece; 200. First adapter piece; 210. Welding pad; 211. Projection; 220. Adapter; 221. First pin; 222. Window; 310. First weld mark; 320. Second weld mark; 330. Third weld mark; 400. Insulating element; 410. First insulating part; 420. Second insulating part; 430. Connecting section; 431. Recess; 500. Second adapter piece; 510. Second pin Detailed description

[0026] In order to make the purpose, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present invention. In the figures, the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The described embodiments are some of the embodiments of this invention, and not all embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and serve only to explain the present invention, but should not be construed as limiting the present invention.All other embodiments that one of ordinary skill in the art can derive from the embodiments of the present invention without creative effort are within the scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] When describing the present invention, it should be noted that the terms "assembly," "connection," and "connection," unless otherwise specified and limited, are to be understood in a broad sense. For example, it may refer to a fixed connection or an indirect connection via an intermediate medium, and it may refer to internal communication between two elements or an interrelationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

[0028] In describing the present invention, it is to be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are the orientations or positional relationships shown based on the drawings and are provided only for the convenience of describing the present invention and for simplification of description, rather than stating or implying that the stated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

[0029] The terms "first", "second", "third" or the like (if any) in the description and claims of this invention and the above drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

[0030] Furthermore, the terms "including" and "comprising," and all variations thereof, are intended to cover non-exclusive inclusion. For example, a process, procedure, system, product, or display that includes a sequence of steps or elements is not necessarily limited to the explicitly listed steps or elements, but may include other steps or elements not explicitly listed or inherent in the process, procedure, product, or display.

[0031] In the prior art, the battery is connected to the corresponding circuit board via the first pin on the first adapter piece and the second pin on the second adapter piece. The first adapter piece is welded to the positive electrode part of the battery case cover, i.e., the cover plate component, and the second adapter piece is welded to the battery case or the negative electrode case cover. However, the cover plate component of the battery is generally made of aluminum. In order to ensure the welding performance between the first adapter piece and the cover plate component, the first adapter piece is generally made of nickel. However, the hardness of the first adapter piece made of nickel is relatively low, and the first pin on the first adapter piece is easily deformed and cannot be welded to a matching circuit board, resulting in the scrapping of the battery.

[0032] After repeated consideration and verification, the inventor found that the first adapter piece can be divided into two parts, namely the body part and the welding part provided on the body part. The welding part can be made of a material with better welding performance on the cover plate component, and the first adapter piece can be reliably welded to the cover plate component of the battery through the welding part, thereby ensuring the reliability of the electrical connection between the first adapter piece and the battery body. The body part of the first adapter piece is formed with a first pin, and the body part can be made of a material with higher hardness to ensure that the first pin is not easily deformed and avoid the problem that the first pin cannot be welded to a mating circuit board due to deformation.

[0033] With this in mind, the inventor designed a battery in which the first adapter piece of the battery has a higher hardness adapter and a lower hardness welding pad. A first pin is formed on the adapter piece. This not only ensures that the first adapter piece can be reliably electrically connected to the battery body, but also reduces the risk of deformation of the first pin, thus avoiding the problem that the first pin cannot be welded to the mating circuit board due to deformation, thereby reducing the battery rejection rate.

[0034] The technical solution of the battery provided by embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] With reference to Fig. 1-4, a battery provided by embodiments of the present invention includes a battery body 100 and a first adapter piece 200. The battery body 100 includes a lower shell 110 and a cover plate component 120 mounted on the lower shell 110. The first adapter piece 200 includes a welding pad 210 and an adapter 220, wherein the welding pad 210 can be electrically connected to the adapter 220 and the cover plate component 120. A first pin 221 is formed at an end of the adapter 220 facing away from the welding pad 210. The hardness of the welding pad 210 is less than the hardness of the adapter 220.

[0036] By way of example, the lower shell 110 is provided with a receiving space. When the battery cell of the battery is placed in the receiving space, the receiving space is sealed by the cover plate component 120. Optionally, a cover 111 is provided at the end of the lower shell 110. After the cover plate component 120 has been placed on the cover 111, it can be sealed and insulated to the lower shell 110 using an insulating sealing adhesive. The positive electrode of the battery cell is electrically connected to the cover plate component 120, and the negative electrode of the battery cell is electrically connected to the lower shell 110.

[0037] As in the Fig. 1, Fig. 2 and Fig. 4, the welding pad 210 is disposed over the cover plate component 120. For example, the adapter 220 forms an approximately "L"-shaped structure, with the horizontal edge of the "L"-shaped structure located on a side of the body portion of the welding pad 210 facing away from the cover plate component 120, and the vertical side of the "L"-shaped structure located on the side of the lower shell 110 and forming the first pin 221. The welding pad 210 is attached to the cover plate component 120 by welding to establish an electrical connection between the welding pad 210 and the cover plate component 120. The material of the welding pad 210 can be aluminum or nickel to ensure a reliable electrical connection between the welding pad 210 and the cover plate component 120.Schematically, the adapter 220 can be made of a metal with relatively high hardness, such as stainless steel, and the adapter 220 can be formed by stamping a metal sheet. The battery body 100 can be connected to a mating circuit board via the first pin 221 of the adapter 220, and the first pin 221 has a relatively high hardness, so the first pin 221 is not easily deformed. The present embodiment does not limit the respective thicknesses of the welding pad 210 and the adapter 220, and those skilled in the art can adjust them as needed.

[0038] As in the Fig. 1 and Fig. 2, the battery further comprises a second adapter piece 500, wherein the second adapter piece 500 can be welded and attached to an end of the lower shell 110 facing away from the first adapter piece 200, wherein the second adapter piece 500 is provided with a second pin 510, and the battery can realize an external power supply via the first pin 221 and the second pin 510.

[0039] In the battery provided by the present embodiment, its first adapter piece 200 can be electrically connected to the cover plate component 120 of the battery body 100. The first adapter piece 200 includes a welding pad 210 and an adapter 220, wherein a first pin 221 is formed at an end of the adapter 220 facing away from the welding pad 210, and the hardness of the welding pad 210 is lower than the hardness of the adapter 220. The material of the welding pad 210 can be nickel or aluminum, which provides good welding performance with the cover plate component 120, while the material of the adapter 220 has a higher hardness, for example, stainless steel. In this way, the first adapter piece 200 can be reliably welded to the cover plate component 120 of the battery body 100.At the same time, the first pin 221 is not easily deformed, thereby reducing the risk of the battery being scrapped because it cannot be welded to a matching circuit board due to the deformation of the first pin 221.

[0040] Furthermore, compared with the first adapter piece 200 in the prior art in which the entire first adapter piece is made of nickel, in the battery provided by the present embodiment, only the welding pad 210 of the first adapter piece 200 is made of nickel, and most of the first adapter piece 200, that is, the adapter 220, can be made of stainless steel, which reduces the amount of nickel used and thus effectively reduces the material cost, thereby reducing the cost of the battery and thus increasing the competitiveness of the battery in the market.

[0041] In one embodiment, the hardness of the adapter 220 is HV300-HV370. One skilled in the art can adjust the hardness of the adapter 220 by determining the specific material of the adapter 220.

[0042] If the hardness of the adapter 220 is less than HV300, the first pin 221 of the adapter 220 may be deformed, which will impair the welding between the first pin 221 and the mating circuit board. If the hardness of the adapter 220 is greater than HV370, the metal sheet is difficult to punch and form, making the manufacturing of the adapter 220 more difficult. Therefore, the above arrangement facilitates the processing of the adapter 220 while ensuring the welding between the first pin 221 and the mating circuit board.

[0043] For example, the hardness of the welding pad 210 is HV130-HV230.

[0044] It should be understood that the hardness of the welding pad 210 can be adjusted by adjusting the specific material of the welding pad 210. If the hardness of the welding pad 210 is less than HV130, the welding pad 210 is easily deformed, causing the adapter 220 connected to the welding pad 210 to be displaced relative to the battery body 100, which in turn affects the welding between the first pin 221 of the adapter 220 and the mating circuit board; if the hardness of the welding pad 210 is greater than HV230, the welding pad 210 is difficult to emboss and form. Therefore, the above arrangement ensures the welding between the first pin 221 and the mating circuit board while facilitating the processing of the welding pad 210.

[0045] In an embodiment, as in Fig. As shown in Figure 3, the welding pad 210 is welded to the adapter 220, and a first welding mark 310 is formed between the welding pad 210 and the adapter 220. The outer diameter φ2 of the first welding mark 310 is 4 mm-6 mm.

[0046] During battery assembly, the welding pad 210 and the adapter 220 may first be welded, with the welded first adapter piece 200 being placed onto the cover plate component 120, with the welding pad 210 connected to the cover plate component 120. It should be understood that during the battery production process, the welding pad 210 and the adapter 220 may be selected in appropriate sizes as needed to improve the versatility of the first adapter piece 200.

[0047] For example, the welding pad 210 and the adapter 220 can be joined by laser welding, and the first welding mark 310 is formed between the welding pad 210 and the adapter 220 under the action of the laser. The first welding mark 310 is circular, and the outer diameter φ2 of the first welding mark 310 can be 4 mm, 5 mm, or 6 mm, or the like, and is not specifically limited here. If the outer diameter φ2 of the first welding mark 310 is less than 4 mm, the welding area between the welding pad 210 and the adapter 220 is smaller, which affects the reliability of the connection between the welding pad 210 and the adapter 220. If the outer diameter φ2 of the first welding mark 310 is larger than 6 mm, the first welding mark 310 may be located at the edge of the welding pad 210 or the adapter 220, which will impair the connection between the welding pad 210 and the adapter 220.

[0048] With this structure, the welding pad 210 and the adapter 220 can be connected by laser welding. Compared with other welding methods, the connection between the welding pad 210 and the adapter 220 is simpler. The size adjustment of the outer diameter φ2 of the first welding mark 310 ensures the reliability of the connection between the welding pad 210 and the adapter 220.

[0049] In one possible version it is like in Fig. 4 and Fig. 8, it is provided that the first welding mark 310 penetrates the adapter 220 and is melted into the welding pad 210, wherein the first welding mark 310 is melted into the welding pad 210 to a depth of 0.05 mm-1 mm.

[0050] During the welding process, the laser may strike the side of the adapter 220 facing away from the welding pad 210 to form the first welding mark 310. As shown in Fig. 4, the melting depth of the first welding mark 310 is H, wherein the depth of the first welding mark 310 melted into the welding pad 210 may be 0.05 mm, 0.1 mm, 0.5 mm or 1 mm or the like and is not clearly limited here, wherein by controlling the power of the laser, the depth of melting of the first welding mark 310 into the welding pad 210 can be controlled.If the depth of the first welding mark 310 fused into the welding pad 210 is less than 0.05 mm, the connection reliability between the welding pad 210 and the adapter 220 is poor, resulting in easy separation between the adapter 220 and the welding pad 210; if the depth of the first welding mark 310 fused into the welding pad 210 is more than 0.1 mm, it indicates that the power of the laser is too large and weld penetration may occur between the welding pad 210 and the adapter 220, which also affects the connection reliability between the welding pad 210 and the adapter 220.

[0051] Due to the above arrangement, the first welding mark 310 does not extend to the side of the welding pad 210 facing away from the adapter 220. When the first adapter piece 200 is placed on the cover plate component 120, the presence of the first welding mark 310 does not affect the tightness of the contact of the welding pad 210 with the cover plate component 120 to ensure the welding between the welding pad 210 and the cover plate component 120. Furthermore, by adjusting the depth of melting of the first welding mark 310 into the welding pad 210, the reliability of the connection between the welding pad 210 and the adapter 220 can be ensured.

[0052] Schematically, the width W of the first welding mark is 310, as in Fig. 4 shown, 0.2 mm-0.5 mm.

[0053] The width of the first welding mark 310 may be 0.2 mm, 0.3 mm, or 0.5 mm, or the like, which is not specifically limited here. The width of the first welding mark 310 can be controlled by controlling the power of the laser. If the width of the first welding mark 310 is less than 0.2 mm, the welding area between the welding pad 210 and the adapter 220 is small, resulting in easy separation between the welding pad 210 and the adapter 220; if the width of the first welding mark 310 is greater than 0.5 mm, the power of the laser during welding is relatively large, and weld penetration may occur between the welding pad 210 and the adapter 220, thereby compromising the reliability of the connection between the welding pad 210 and the adapter 220. That is, the above arrangement can ensure the reliability of the connection between the welding pad 210 and the adapter 220.

[0054] In a specific version, as in the Fig. As shown in Figures 2 to 6, the adapter 220 is provided with a window 222 directly opposite the welding pad 210, the window 222 penetrating the adapter 220. A projection 211 protrudes from the welding pad 210, and the projection 211 extends into the window 222.

[0055] It should be understood that after connecting the welding pad 210 to the adapter 220, the welding pad 210 may be exposed at the window 222 of the adapter 220, and the laser may target the position of the welding pad 210 within the window 222 to weld the welding pad 210 to the cover plate component 120. The shape of the window 222 may be any suitable shape, such as a circle, a square, or a polygon, and is not strictly limited herein.

[0056] By providing a window 222 on the adapter 220 to expose a portion of the welding pad 210, the welding pad 210 and the cover plate component 120 can be joined together by laser welding, thereby facilitating the connection between the welding pad 210 and the cover plate component 120.

[0057] For example, the protrusion 211 can be arranged in the center position of the side of the welding pad 210 facing away from the cover plate component 120. The cross-sectional shape and size of the protrusion 211 match the window 222. When the protrusion 211 extends into the window 222, rapid positioning between the welding pad 210 and the adapter 220 can be achieved, which has a positive effect on improving the assembly efficiency of the first adapter piece 200. Optionally, the protrusion 211 can be formed on the welding pad 210 by punching. After the welding pad 210 is punched, the thickness of the remaining portions of the welding pad 210 is reduced, thereby forming the protrusion 211 on the welding pad 210.

[0058] It is worth noting that during the welding process of the welding pad 210 and the cover plate component 120, the laser strikes the side of the projection 211 facing away from the cover plate component 120, thereby creating a weld mark between the projection 211 and the cover plate component 120.

[0059] In other embodiments, a portion of the welding pad 210 extends beyond the adapter 220, and the portion of the welding pad 210 that extends beyond the adapter 220 can be connected to the cover plate component 120. Alternatively, the adapter 220 can completely cover the side of the welding pad 210 facing away from the cover plate component 120, wherein the welding pad 210 and the cover plate component 120 can be joined together by ultrasonic welding.

[0060] As in the Fig. 1, Fig. 2 and Fig. 5, in the thickness direction of the welding pad 210, the end of the projection 211 is located within the window 222, and the distance H1 between the end of the projection 211 and the side of the adapter 220 facing away from the cover plate component 120 is 0.02 mm-0.05 mm.

[0061] Specifically, as in the Fig. 2 and Fig. 5, the welding pad 210 is located above the cover plate component 120, and a part of the adapter 220 connected to the welding pad 210 is located above the body part of the welding pad 210, with the upper end of the projection 211 being located lower than the upper surface of the adapter 220, that is, the height of the projection 211 is less than the thickness of the adapter 220. The distance H1 between the upper end of the projection 211 and the upper surface of the adapter 220 may be 0.02 mm, 0.03 mm, or 0.05 mm, or the like, and is not clearly limited here.

[0062] If the distance H1 between the protrusion 211 and the side of the adapter 220 facing away from the cover plate component 120 is less than 0.02 mm, the welding mark on the protrusion 211 may protrude from the window 222, resulting in an increase in the height of the battery and thereby affecting the energy density of the battery; if the distance H1 between the protrusion 211 and the side of the adapter 220 facing away from the cover plate component 120 is greater than 0.05 mm, this means that the length of the part of the protrusion 211 that protrudes into the window 222 is shorter, which impairs the positioning effect between the welding pad 210 and the adapter 220. That is, the above arrangement can prevent the welding mark on the protrusion 211 from extending from the window 222 while ensuring the positioning effect between the welding pad 210 and the adapter 220.

[0063] Optional is, as in the Fig. 2 and Fig. 3, the shape of the window 222 is circular and the diameter φ1 of the window 222 is 1 mm-3 mm.

[0064] The diameter φ1 of the window 222 may be 1 mm, 2 mm, or 3 mm, or the like, and is not specifically limited here. It is understood that the first weld mark 310 is located between the weld pad 210 and the adapter 220 outside the window 222, and the weld mark between the weld pad 210 and the cover plate component 120 is located inside the window 222.When the diameter φ1 of the window 222 is greater than 3 mm, the distance between the window 222 and the edge of the adapter 220 is small, that is, the area where the first welding mark 310 is located is small, thereby increasing the difficulty of welding between the welding pad 210 and the adapter 220; when the diameter φ1 of the window 222 is less than 1 mm, the window 222 limits the size of the welding mark between the welding pad 210 and the cover plate component 120, thus affecting the reliability of the connection between the welding pad 210 and the cover plate component 120. That is, the above arrangement facilitates welding between the welding pad 210 and the adapter 220 and also contributes to ensuring the reliability of the connection between the welding pad 210 and the cover plate component 120.

[0065] As in the Fig. 2, Fig. 6, Fig. 7 and Fig. 8, the adapter 220 is provided with a window 222 arranged directly opposite the welding pad 210, wherein a second welding mark 320 is formed between the welding pad 210 and the cover plate component 120, wherein a projection of the second welding mark 320 in the thickness direction of the welding pad 210 is arranged within the window 222.

[0066] It should be understood that when laser welding is used to attach the welding pad 210 and the cover plate component 120, the laser impinges on a portion of the welding pad 210 exposed from the window 222, and the laser energy creates a second welding mark 320 between the welding pad 210 and the cover plate component 120, and the welding pad 210 and the cover plate component 120 are secured by the second welding mark 320. The above arrangement facilitates the connection between the welding pad 210 and the cover plate component 120, which has a positive effect on improving the assembly efficiency of the battery.

[0067] It is optional, as in Fig. 6 to Fig. 8, the shape of the second welding mark 320 is circular, wherein the diameter φ3 of the second welding mark 320 is 0.8 mm to 1.5 mm.

[0068] The diameter φ3 of the second weld mark 320 may be 0.8 mm, 1.2 mm, or 1.5 mm, or the like, and is not specifically limited here. When laser welding is used between the welding pad 210 and the cover plate component 120, the diameter φ3 of the second weld mark 320 can be controlled by controlling the laser power. If the diameter φ3 of the second weld mark 320 is less than 0.8 mm, the area of ​​the welding region between the welding pad 210 and the cover plate component 120 is smaller, resulting in weaker connection reliability between the welding pad 210 and the cover plate component 120; if the diameter φ3 of the second weld mark 320 is larger than 1.2 mm, weld penetration may occur between the welding pad 210 and the cover plate component 120, resulting in battery fluid leakage.That is, the above arrangement can prevent the welding pad 210 from falling off the cover plate component 120 and at the same time ensure the sealing of the battery.

[0069] It is schematic, as in Fig. 6 to Fig. 8, it is provided that the second welding mark 320 penetrates the welding pad 210 and is fused into the cover plate component 120, wherein the depth of the second welding mark 320 fused into the cover plate component 120 is 0.05 mm-0.1 mm.

[0070] When laser welding is used between the welding pad 210 and the cover plate component 120, the laser impinges on the side of the welding pad 210 facing away from the cover plate component 120 to form the second welding mark 320, wherein by controlling the power of the laser, the depth of melting of the second welding mark 320 into the cover plate component 120 can be controlled. As shown in Fig. As shown in Figure 8, the melting depth of the second weld mark 320 is H2, and the melting depth of the second weld mark 320 into the cover plate component 120 may be 0.05 mm, 0.08 mm, or 0.1 mm, or the like, which is not specifically limited here. If the depth of the second weld mark 320 melted into the cover plate component 120 is less than 0.05 mm, the reliability of the connection between the weld pad 210 and the cover plate component 120 is poor; if the second weld mark 320 melts into the cover plate component 120 to a depth of more than 0.1 mm, weld penetration may occur between the weld pad 210 and the cover plate component 120, resulting in battery fluid leakage.That is, the above arrangement can ensure that the welding pad 210 is reliably fixed to the cover plate component 120 while ensuring the sealing of the battery.

[0071] As in the Fig. 6 to 8, a first welding mark 310 is formed between the welding pad 210 and the adapter 220, wherein a projection of the first welding mark 310 in the thickness direction of the welding pad 210 lies outside a projection of the second welding mark 320 in the thickness direction of the welding pad 210.

[0072] Schematically, the first weld mark 310 is arranged around the second weld mark 320. The inner diameter of the first weld mark 310 is larger than the diameter of the second weld mark 320.

[0073] With the above arrangement, after the first adapter piece 200 is placed on the cover plate component 120, a laser can be used to strike a portion of the weld pad 210 located within the first weld mark 310, thereby forming the second weld mark 320 between the weld pad 210 and the cover plate component 120 to facilitate the electrical connection between the weld pad 210 and the cover plate component 120.

[0074] As in the Fig. 6 to 8, a first welding mark 310 is formed between the welding pad 210 and the adapter 220, wherein a first distance is formed between the projection of the first welding mark 310 in the thickness direction of the welding pad 210 and the projection of the second welding mark 320 in the thickness direction of the welding pad 210, the width of the first distance being 1.6 mm-2.625 mm.

[0075] The first spacing is arranged around the second weld mark 320. Schematically, the inner diameter of the first weld mark 310 is larger than the diameter of the second weld mark 320. After the battery is assembled, the first weld mark 310 and the second weld mark 320 will not overlap.

[0076] By forming the first gap between the first weld mark 310 and the second weld mark 320, the first weld mark 310 will not interfere with the welding between the weld pad 210 and the cover plate component 120 during the battery assembly process, and the second weld mark 320 will not interfere with the welding between the weld pad 210 and the adapter 220, thereby ensuring that the weld pad 210 can be reliably connected to the adapter 220 and the cover plate component 120, thereby preventing fluid leakage of the battery.

[0077] For example, the width of the first gap may be 1.6 mm, 2 mm, or 2.625 mm, or the like, which is not clearly limited here. If the width of the first gap is less than 1.6 mm, the first weld mark 310 and the second weld mark 320 may overlap during the battery assembly process due to assembly tolerances, thereby compromising the reliability of the connection between the weld pad 210 and the cover plate component 120 or the adapter 220; if the width of the first gap is greater than 2.625 mm, this means that the diameter of the first weld mark 310 is larger or the diameter of the second weld mark 320 is smaller.If the diameter of the first welding mark 310 is larger, the first welding mark 310 may be located at the edge of the welding pad 210 or the adapter 220, thereby compromising the reliability of the connection between the welding pad 210 and the adapter 220; if the diameter of the second welding mark 320 is smaller, the welding pad 210 may easily fall off the cover plate component 120. Therefore, the above arrangement can ensure the reliability of the connection between the welding pad 210 and the adapter 220, as well as between the welding pad 210 and the cover plate component 120.

[0078] Optionally, the first welding mark 310 is formed between the welding pad 210 and the adapter 220, wherein the projection of the first welding mark 310 in the thickness direction of the welding pad 210 and the projection of the second welding mark 320 in the thickness direction of the welding pad 210 are arranged in concentric circles.

[0079] It is understood that, in the circumferential direction of the second welding mark 320, the width of the first gap between the first welding mark 310 and the second welding mark 320 is consistent. The above arrangement can also ensure that the first welding mark 310 does not interfere with the welding between the welding pad 210 and the cover plate component 120, and the second welding mark 320 does not interfere with the welding between the welding pad 210 and the adapter 220, thereby ensuring that the welding pad 210 can be reliably connected to both the adapter 220 and the cover plate component 120.

[0080] In one embodiment, the welding pad 210 and the adapter 220 are formed in one piece.

[0081] Schematically, the first adapter piece 200 is a composite material comprising different metals. For example, the first adapter piece 200 comprises a high-hardness stainless steel part and a low-hardness nickel part, with the stainless steel part being the adapter 220 and the nickel part being the welding pad 210. The bonding process between different metal materials is well known to those skilled in the art and will not be described further in the present invention.

[0082] The welding pad 210 and the adapter 220 are integrally formed, which reduces the process of connecting the welding pad 210 and the adapter 220 during the battery assembly process, thereby improving the production efficiency of the battery. Furthermore, the integral formation of the welding pad 210 and the adapter 220 is beneficial for improving the conductivity of the first adapter piece 200, reducing the heat generated by the first adapter piece 200, and thus improving the safety performance of the battery.

[0083] In an embodiment, as in Fig. 2, Fig. 6, Fig. 7 and Fig. As shown in Figure 8, the cover plate component 120 includes a cover plate 121 mounted on the lower shell 110 and a sealing piece 122 mounted on the cover plate 121. The cover plate 121 is insulated and sealed to the lower shell 110, and the sealing piece 122 is electrically connected to the cover plate 121 and the welding pad 210, respectively. A third welding mark 330 is formed between the sealing piece 122 and the cover plate 121.

[0084] The cover plate 121 is placed on the cover 111 of the lower shell 110, with an insulating sealing adhesive provided between the cover 111 and the cover plate 121. The cover plate 121 is provided with a liquid injection port through which the electrolyte can be injected into the interior of the receiving space. For example, the shape of the sealing piece 122 matches the shape of the liquid injection port, and the sealing piece 122 is placed on the cover plate 121 to block the liquid injection port. The sealing piece 122 is welded to the cover plate 121 and the welding pad 210, respectively.In one possible embodiment, it is provided that the length of the end of the projection 211 on the welding pad 210 beyond the cover plate 121 is 0.02 mm-0.05 mm after the welding pad 210 is connected to the sealing piece 122, that is, the upper surface of the projection 211 is 0.02 mm to 0.05 mm higher than the upper surface of the cover plate 121.

[0085] It is worth mentioning that the third welding mark 330 is arranged around the liquid injection port, and the third welding mark 330 formed between the sealing piece 122 and the cover plate 121 enables the sealing piece 122 to reliably seal the liquid injection port.

[0086] In a specific embodiment, as shown in the Fig. 6-8, a second welding mark 320 is formed between the welding pad 210 and the sealing piece 122, wherein a projection of the third welding mark 330 in the thickness direction of the welding pad 210 is arranged outside a projection of the second welding mark 320 in the thickness direction of the welding pad 210.

[0087] For example, the third weld mark 330 is circular, and the second weld mark 320 is arranged within the circular shape. The inner diameter of the third weld mark 330 is larger than the diameter of the second weld mark 320. The diameter φ4 of the third weld mark 330 can be 3 mm-4 mm. During the battery assembly process, the second weld mark 320 and the third weld mark 330 will not overlap.

[0088] With the above arrangement, during the battery assembly process, the second welding mark 320 does not interfere with the welding between the sealing piece 122 and the cover plate 121, and the third welding mark 330 does not interfere with the welding between the welding pad 210 and the sealing piece 122, thereby ensuring that the sealing piece 122 can be reliably connected to the cover plate 121 and the welding pad 210, thereby preventing liquid leakage of the battery.

[0089] In a specific version, as in the Fig. 6-8, a second welding mark 320 is formed between the welding pad 210 and the sealing piece 122, wherein a second distance is formed between the projection of the third welding mark 330 in the thickness direction of the welding pad 210 and the projection of the second welding mark 320 in the thickness direction of the welding pad 210, wherein the width of the second distance is 0.55 mm - 0.625 mm.

[0090] The width of the second gap may be 0.55 mm, 0.6 mm, or 0.625 mm, or the like, and is not clearly limited here. If the width of the second gap is less than 0.55 mm, the second weld mark 320 and the third weld mark 330 may overlap during the battery assembly process due to assembly tolerances, thereby compromising the reliability of the connection between the sealing piece 122 and the cover plate 121 or the welding pad 210. If the width of the second gap is greater than 0.625 mm, this means that the diameter of the third weld mark 330 is larger or the diameter of the second weld mark 320 is smaller.If the diameter of the third welding mark 330 is larger, the third welding mark 330 may be located at the edge of the sealing piece 122 or the cover plate 121, thereby compromising the reliability of the connection between the sealing piece 122 and the cover plate 121; if the diameter of the second welding mark 320 is smaller, the welding pad 210 may easily fall off the sealing piece 122. That is, the above arrangement can ensure the reliability of the connection between the sealing piece 122 and the welding pad 210, as well as between the sealing piece 122 and the cover plate 121.

[0091] In one possible version, as in the Fig. 6-8, a second welding mark 320 is formed between the welding pad 210 and the sealing piece 122, wherein the projection of the third welding mark 330 in the thickness direction of the welding pad 210 and the projection of the second welding mark 320 in the thickness direction of the welding pad 210 are arranged in concentric circles.

[0092] It is understood that the width of the second gap remains constant in the circumferential direction of the second welding mark 320. Furthermore, the above arrangement prevents the second welding mark 320 and the third welding mark 330 from overlapping due to assembly tolerances, thereby ensuring the reliability of the connection between the sealing piece 122 and the welding pad 210, as well as between the sealing piece 122 and the cover plate 121.

[0093] As in the Fig. 1, Fig. 2 and Fig. As shown in Figure 6, the battery also includes an insulating member 400. The insulating member 400 includes a first insulating portion 410 and a second insulating portion 420, wherein the first insulating portion 410 is provided between the cover 111 of the lower shell 110 and the adapter 220, and the second insulating portion 420 is provided between the side wall of the lower shell 110 and the first pin 221.

[0094] As the insulating member 400, for example, insulating adhesive tape can be used, which can be arranged on the lower shell 110 by adhesive bonding. After the lower shell 110 of the battery body 100 and the cover plate component 120 are connected to each other, the first insulating part 410 is arranged on the upper side of the cover 111 of the lower shell 110, and the second insulating part 420 is provided on the side wall of the lower shell 110. After the first adapter piece 200 is connected to the cover plate component 120, the first insulating part 410 is arranged between the horizontal edge of the adapter 220 and the cover 111, and the second insulating part 420 is arranged between the vertical side of the adapter 220, that is, the first pin 221, and the side wall of the lower shell 110.

[0095] The present embodiment does not limit the specific shapes and sizes of the first insulating part 410 and the second insulating part 420, as long as the first insulating part 410 can prevent the adapter 220 from electrically contacting the cover 111 of the lower shell 110, and the second insulating part 420 can prevent the first pin 221 of the adapter 220 from electrically contacting the side wall of the lower shell 110.

[0096] The arrangement of the insulating member 400 prevents a short circuit of the battery due to the contact of the adapter 220 with the lower shell 110, thereby ensuring the safety performance of the battery.

[0097] In other embodiments, an insulating coating may be provided at a corresponding location on the lower shell 110, wherein the insulating coating achieves mutual insulation between the lower shell 110 and the adapter 220.

[0098] In one possible version it is like in Fig. 2, the insulating element 400 further comprises a connecting portion 430 connected between the first insulating part 410 and the second insulating part 420, wherein a recess 431 is provided on opposite two sides of the connecting portion 430.

[0099] The first insulating part 410, the second insulating part 420, and the connecting portion 430 are integrally formed. After the insulating member 400 is arranged on the lower shell 110, the connecting portion 430 is arranged at a position where the cover 111 of the lower shell 110 is connected to the side wall. Specifically, two recesses 431 are provided on opposite two sides of the connecting portion 430 in the width direction. The shape of each recess 431 can be adjusted as needed, which is not strictly limited here.

[0100] By providing the recess 431 at the connecting portion 430, the insulating member 400 is less likely to wrinkle when bent when the insulating member 400 is connected to the lower shell 110, thereby ensuring the appearance of the battery on the one hand, and the insulating member 400 does not protrude from the lower shell 110 due to wrinkles on the other hand, whereby the insulating member 400 does not cause a misjudgment of the battery size when testing the energy density of the battery, thereby ensuring the accuracy of the test.

[0101] The following briefly presents the assembly process of the battery so that the person skilled in the art can better understand the technical solution of the present invention.

[0102] The welding pad 210 of the first adapter piece 200 is assembled with the adapter 220: the projection 211 of the welding pad 210 is inserted into the window 222 of the adapter 220, and after positioning and installation, the welding pad 210 and the adapter 220 are clamped with a clamp, and the welding pad 210 and the adapter 220 are fixed by laser welding.

[0103] The insulating element 400 is connected to the lower shell 110 of the battery, wherein the first insulating part 410 of the insulating element 400 is arranged on the cover 111 of the lower shell 110, wherein the second insulating part 420 of the insulating element 400 is arranged on the side wall of the lower shell 110.

[0104] The welding pad 210 of the first adapter piece 200 is connected to the cover plate component 120, and the welding pad 210 is arranged over the sealing piece 122 of the cover plate component 120. The adapter 220 is insulated from the lower shell 110 by the insulating member 400 to prevent short circuits. The first adapter piece 200 and the battery body 100 are clamped with a clamp, and the laser is irradiated onto the area of ​​the welding pad 210 exposed by the window 222, and spiral spot welding is performed, attaching the welding pad 210 to the sealing piece 122 of the cover plate component 120 to establish the connection between the first adapter piece 200 and the battery body 100. wherein a first welding mark 310 is formed between the welding pad 210 of the first adapter piece 200 and the adapter 220, wherein a second welding mark 320 is formed between the welding pad 210 and the sealing piece 122 of the cover plate component 120, and wherein a third welding mark 330 is formed between the cover plate 121 and the sealing piece 122 of the cover plate component 120.

[0105] In the thickness direction of the welding pad 210, the projection relationship between the first welding mark 310 and the second welding mark 320 is a concentric circle relationship without overlap, wherein the one-sided distance between the outermost edges of the two welding mark circles is 1.6 mm to 2.625 mm.

[0106] In the thickness direction of the welding pad 210, the projection relationship between the second welding mark 320 and the third welding mark 330 is a concentric circular relationship without overlap, wherein the one-sided distance between the outermost edges of the two welding mark circles is 0.55 mm to 0.625 mm.

[0107] The second adapter piece 500 is attached to the side of the lower shell 110 facing away from the cover plate component 120, wherein the second adapter piece 500 and the lower shell 110 are welded together by laser welding.

[0108] Finally, it should be noted that the above respective embodiments only serve to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the above respective embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above embodiments or make equivalent substitutions to some or all of the technical features; however, these modifications or substitutions do not cause the essence of the respective technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

[1] Battery, characterized by that the battery has a battery body (100) and a first adapter piece (200); wherein the battery body (100) comprises a lower shell (110) and a cover plate component (120) mounted on the lower shell (110); wherein the first adapter piece (200) comprises a welding pad (210) and an adapter (220), wherein the welding pad (210) is electrically connected to the adapter (220) and the cover plate component (120), wherein a first pin (221) is formed at an end of the adapter (220) facing away from the welding pad (210); and wherein the hardness of the welding pad (210) is smaller than the hardness of the adapter (220). [2] Battery according to claim 1, characterized by that the hardness of the adapter (220) is HV300-HV370; and / or wherein the hardness of the welding pad (210) is HV130-HV230. [3] Battery according to claim 1, characterized byin that the welding pad (210) is welded and connected to the adapter (220), wherein a first welding mark (310) is formed between the welding pad (210) and the adapter (220); wherein the outer diameter of the first welding mark (310) is 4 mm to 6 mm; and / or wherein the first welding mark (310) penetrates the adapter (220) and is fused into the welding pad (210), wherein the depth of the fusion of the first welding mark (310) into the welding pad (210) is 0.05 mm-1 mm; and / or wherein the width of the first welding mark (310) is 0.2 mm to 0.5 mm. [4] Battery according to claim 1, characterized by in that the adapter (220) is provided with a window (222) directly opposite the welding pad (210), wherein the window (222) penetrates the adapter (220), wherein a projection (211) projects from the welding pad (210), and wherein the projection (211) extends into the window (222). [5] Battery according to claim 4, characterized by in that the end of the projection (211) is arranged within the window (222) in the thickness direction of the welding pad (210), wherein the distance between the end of the projection (211) and a side of the adapter (220) facing away from the cover plate component (120) is 0.02 mm to 0.05 mm; and / or wherein the shape of the window (222) is circular, wherein the diameter of the window (222) is 1 mm to 3 mm. [6] Battery according to claim 1, characterized by in that the adapter (220) is provided with a window (222) directly opposite the welding pad (210), wherein a second welding mark (320) is formed between the welding pad (210) and the cover plate component (120), wherein a projection of the second welding mark (320) in the thickness direction of the welding pad (210) lies within the window (222). [7] Battery according to claim 6, characterized byin that the shape of the second weld mark (320) is circular, wherein the diameter of the second weld mark (320) is 0.8 mm to 1.5 mm; and / or wherein the second weld mark (320) penetrates the weld pad (210) and is fused into the cover plate component (120), wherein the depth of the second weld mark (320) fused into the cover plate component (120) is 0.05 mm-0.1 mm. [8] Battery according to claim 6, characterized by that a first welding mark (310) is formed between the welding pad (210) and the adapter (220), wherein a projection of the first welding mark (310) in the thickness direction of the welding pad (210) lies outside a projection of the second welding mark (320) in the thickness direction of the welding pad (210). [9] Battery according to claim 6, characterized byin that a first welding mark (310) is formed between the welding pad (210) and the adapter (220), wherein a first distance is formed between the projection of the first welding mark (310) in the thickness direction of the welding pad (210) and the projection of the second welding mark (320) in the thickness direction of the welding pad (210), wherein the width of the first distance is 1.6 mm-2.625 mm. [10] Battery according to claim 6, characterized by in that a first welding mark (310) is formed between the welding pad (210) and the adapter (220), wherein the projection of the first welding mark (310) in the thickness direction of the welding pad (210) and the projection of the second welding mark (320) in the thickness direction of the welding pad (210) are arranged in concentric circles. [11] Battery according to claim 1, characterized by that the welding pad (210) and the adapter (220) are formed in one piece. [12] Battery according to one of claims 1 to 11, characterized by in that the cover plate component (120) comprises a cover plate (121) mounted on the lower shell (110) and a sealing piece (122) mounted on the cover plate (121), wherein the cover plate (121) is connected to the lower shell (110) in an insulated and sealed manner, wherein the sealing piece (122) is electrically connected to the cover plate (121) and the welding pad (210), and wherein a third welding mark (330) is formed between the sealing piece (122) and the cover plate (121). [13] Battery according to claim 12, characterized by in that a second welding mark (320) is formed between the welding pad (210) and the sealing piece (122), wherein a projection of the third welding mark (330) in the thickness direction of the welding pad (210) is arranged outside a projection of the second welding mark (320) in the thickness direction of the welding pad (210). [14] Battery according to claim 12, characterized by in that a second welding mark (320) is formed between the welding pad (210) and the sealing piece (122), wherein a second distance is formed between the projection of the third welding mark (330) in the thickness direction of the welding pad (210) and the projection of the second welding mark (320) in the thickness direction of the welding pad (210), and wherein the width of the second distance is 0.55 mm - 0.625 mm. [15] Battery according to claim 12, characterized by that a second welding mark (320) is formed between the welding pad (210) and the sealing piece (122), wherein the projection of the third welding mark (330) in the thickness direction of the welding pad (210) and the projection of the second welding mark (320) in the thickness direction of the welding pad (210) are arranged in concentric circles. [16] Battery according to one of claims 1 to 11, characterized byin that the battery further comprises an insulating element (400), wherein the insulating element (400) comprises a first insulating part (410) and a second insulating part (420), wherein the first insulating part (410) is arranged between the cover (111) of the lower shell (110) and the adapter (220), wherein the second insulating part (420) is arranged between the side wall of the lower shell (110) and the first pin (221). [17] Battery according to claim 16, characterized by that the insulating element (400) further comprises a connecting portion (430) which is connected between the first insulating part (410) and the second insulating part (420), wherein a recess (431) is provided on each of the two opposite sides of the connecting portion (430).

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