Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a shell structure, the pole structure is arranged on the shell structure; the battery cell is arranged in the shell structure, the battery cell comprises a battery cell main body and a pole lug, the pole lug extends out of the battery cell main body, and the pole lug is directly contacted and electrically connected with the pole column structure; the connecting piece is arranged on the side, deviating from the pole structure, of the pole lug, the connecting piece is arranged in a protruding mode towards the pole lug so that a pit can be formed in the side, deviating from the pole lug, of the connecting piece, the pole structure, the pole lug and the connecting piece are welded so that a welding mark can be formed in the pit, and therefore positioning of a welding head in the welding process can be facilitated; therefore, the welding efficiency of the pole structures, the tabs and the connecting pieces is improved, stress release can be formed through the connecting pieces, the risk of welding failure is reduced, and the safe use performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a battery may include a pole structure and a battery cell. The pole tab of the battery cell may be connected to the pole structure by welding. However, when the pole tab and the pole structure are welded, due to the structural limitations of the pole tab itself, welding may be difficult to operate, which in turn affects the welding efficiency. Utility Model Content

[0003] The utility model provides a battery to improve the use performance of the battery.

[0004] The utility model provides a battery, comprising:

[0005] Shell structure;

[0006] A pole structure, wherein the pole structure is arranged on the shell structure;

[0007] The battery cell is arranged in the shell structure, and the battery cell comprises a battery cell body and a pole ear, the pole ear extends from the battery cell body, and the pole ear is directly in contact with the pole structure and electrically connected;

[0008] The connecting piece is arranged on the side of the pole ear away from the pole structure, and the connecting piece is protruded toward the pole ear to form a depression on the side of the connecting piece away from the pole ear. The pole structure, the pole ear and the connecting piece are welded to form a weld mark in the depression.

[0009] The battery of the embodiment of the utility model includes a shell structure, a pole structure, a battery cell and a connecting piece, wherein the pole structure is arranged on the shell structure, and the battery cell is arranged in the shell structure, so that the pole structure and the battery cell can be electrically connected. The pole ear on the battery body is directly in contact with the pole structure and electrically connected, and the pole structure, the pole ear and the connecting piece are welded, so that the connection stability between the pole ear and the pole structure can be ensured, and the abutment stability between the directly contacting pole ear and the pole structure can be ensured due to the existence of the connecting piece, so that the welding quality of the pole ear and the pole structure can be ensured. A depression is formed on the side of the connecting piece away from the pole ear, and a welding mark is formed in the depression, so that the positioning of the welding head during the welding process can be facilitated, thereby improving the welding efficiency of the pole structure, the pole ear and the connecting piece, and stress release can also be formed through the connecting piece to reduce the risk of welding failure, thereby improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0013] Figure 3 is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0014] Figure 4 is a schematic structural diagram of a connecting piece and a welding mark of a battery according to an exemplary embodiment;

[0015] Figure 5 is a schematic structural diagram of a battery cell according to an exemplary embodiment.

[0016] The following are the descriptions of the reference numerals:

[0017] 10. Shell structure; 11. Shell member; 12. Cover plate; 20. Pole structure; 30. Battery cell; 31. Battery cell body; 32. Pole ear; 40. Connecting piece; 41. Depression; 42. Weld mark; 43. Non-welding area. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0019] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0020] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0021] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0022] An embodiment of the present invention provides a battery. Figures 1 to 5 The battery includes: a shell structure 10; a pole structure 20, the pole structure 20 is arranged on the shell structure 10; a battery cell 30, the battery cell 30 is arranged in the shell structure 10, the battery cell 30 includes a battery cell body 31 and a pole ear 32, the pole ear 32 extends from the battery cell body 31, and the pole ear 32 is directly in contact with and electrically connected to the pole structure 20; a connecting piece 40, the connecting piece 40 is arranged on a side of the pole ear 32 away from the pole structure 20, the connecting piece 40 protrudes toward the pole ear 32, so as to form a recess 41 on the side of the connecting piece 40 away from the pole ear 32, and the pole structure 20, the pole ear 32 and the connecting piece 40 are welded to form a weld mark 42 in the recess 41.

[0023] A battery in one embodiment of the utility model includes a shell structure 10, a pole structure 20, a battery cell 30 and a connecting piece 40, wherein the pole structure 20 is arranged on the shell structure 10, and the battery cell 30 is arranged in the shell structure 10, so that the pole structure 20 and the battery cell 30 can be electrically connected. The pole ear 32 on the battery body 31 is directly in contact with the pole structure 20 and electrically connected, and the pole structure 20, the pole ear 32 and the connecting piece 40 are welded, so that the connection stability of the pole ear 32 and the pole structure 20 can be ensured, and due to the presence of the connecting piece 40, the abutment stability between the directly contacting pole ear 32 and the pole structure 20 can be ensured, so that the welding quality of the pole ear 32 and the pole structure 20 can be ensured. A recess 41 is formed on the side of the connecting piece 40 facing away from the pole ear 32, and a weld mark 42 is formed in the recess 41, which can facilitate the positioning of the welding head during the welding process, thereby improving the welding efficiency of the pole structure 20, the pole ear 32 and the connecting piece 40, and can also release stress through the connecting piece 40 to reduce the risk of welding failure, thereby improving the safe use performance of the battery.

[0024] It should be noted that the shell structure 10 is used to protect the battery cell 30, and the pole structure 20 arranged on the shell structure 10 is used as the charging and discharging end of the battery, and the battery cell 30 is electrically connected to the pole structure 20, thereby realizing the charging and discharging of the battery.

[0025] The pole ear 32 is in direct contact and electrically connected to the pole column structure 20, that is, there is no need to provide an adapter plate between the pole ear 32 and the pole column structure 20 for adapter connection, that is, the battery can omit the adapter plate, thereby reducing the number of battery components used, thereby improving the overall energy density of the battery.

[0026] Combination Figure 2 and Figure 3 As shown, the connecting piece 40 is arranged on the side of the pole ear 32 away from the pole structure 20, and the connecting piece 40 protrudes toward the pole ear 32. A recess 41 is formed on the side of the connecting piece 40 away from the pole ear 32, that is, a accommodating space can be formed on the side of the connecting piece 40 away from the pole structure 20, and then in the process of welding the pole structure 20, the pole ear 32 and the connecting piece 40, the recess 41 can be used as a positioning space, thereby facilitating the rapid positioning of the welding head, thereby improving the welding efficiency of the pole structure 20, the pole ear 32 and the connecting piece 40.

[0027] The connecting piece 40 is protruding toward the pole ear 32 , and a depression 41 is formed on the side of the connecting piece 40 away from the pole ear 32 . For example, the depression 41 is formed by pressing the connecting piece 40 on the side away from the pole ear 32 to form a convex bump on the connecting piece 40 .

[0028] The pole structure 20, the pole ear 32 and the connecting piece 40 are welded to form a weld mark 42 in the recess 41, that is, during the welding process, the welding head is located on the side of the connecting piece 40 having the recess 41, so that the formed weld mark 42 is located in the recess 41. The weld mark 42 can be located on the wall surface forming the recess 41, for example, the weld mark 42 can be located on the bottom wall forming the recess 41.

[0029] Considering that the pole ear 32 is in direct contact with the pole column structure 20, the setting of the connecting piece 40 can play a role in abutment and positioning, ensuring the contact ability between the pole ear 32 and the pole column structure 20, and the presence of the recess 41 can facilitate the positioning and fixation of the welding area of ​​the pole column structure 20, the pole ear 32 and the connecting piece 40, improve the welding efficiency of the pole column structure 20, the pole ear 32 and the connecting piece 40, and at the same time be used to release stress. Compared with the flat-plate connecting piece 40, the connecting piece 40 with the recess 41 can reduce the risk of tearing after welding. At the same time, the connecting piece 40 can provide a guide for the pole ear 32 to converge, which is convenient for the non-welding part of the pole ear 32 to converge, thereby improving the overall manufacturing efficiency of the battery.

[0030] The connecting sheet 40 may be a metal sheet, for example, the connecting sheet 40 may be a copper sheet, or the connecting sheet 40 may be an aluminum sheet, etc.

[0031] In one embodiment, the weld mark 42 is formed with a pit, and the ratio of the depth of the depression 41 to the depth of the pit is 0.3-6, which not only enables the connecting piece 40 to form a reliable pressure on the pole lug 32, but also ensures the welding connection strength between the pole lug 32 and the pole structure 20, thereby ensuring the current carrying capacity and safe use performance between the pole lug 32 and the pole structure 20.

[0032] The connecting piece 40 is formed with a depression 41, and the formation of the depression 41 can ensure the connection piece 40's ability to press against the pole lug 32. The greater the thickness of the pole lug 32, the greater the force that the pole lug 32 needs to press against, and the deeper the depth of the depression 41 needs to be. At the same time, the greater the thickness of the pole lug 32, the greater the depth of the pit formed by the weld mark 42 needs to be, thereby ensuring the welding connection strength between the pole lug 32 and the pole structure 20, and can ensure the contact strength between the individual pole lugs forming the pole lug 32, thereby reducing the risk of cold welding.

[0033] The ratio of the depth of the depression 41 to the depth of the pit can be 0.3, 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.4, 5.4, 5.8 or 6, etc.

[0034] It should be noted that the depth of the depression 41 may be the maximum depth of the depression, and correspondingly, the depth of the pit may be the maximum depth of the pit. The depth of the depression 41 and the depth of the pit may be measured by a three-dimensional coordinate measuring instrument. Of course, the depth may also be measured by capturing images of the depression 41 and the pit. The method for measuring the depth of the depression 41 and the depth of the pit is not limited here.

[0035] In one embodiment, the ratio of the depth of the recess 41 to the thickness of the pole lug 32 is 0.5-5. On the basis of ensuring that the pole lug 32 can have reliable current flow capacity, it can also ensure that the connecting piece 40 can form a reliable pressure on the pole lug 32, thereby ensuring the welding quality between the pole lug 32 and the pole structure 20, and improving the current flow capacity between the pole lug 32 and the pole structure 20.

[0036] The pole lug 32 may include multiple single-piece pole lugs, and the thickness of the pole lug 32 is the total thickness of the multiple single-piece pole lugs. The thicker the pole lug 32 is, the greater the need for the connecting plate 40 to abut against it. Therefore, the contact ability between the pole lug 32 and the pole structure 20 can be ensured by increasing the depth of the recess 41.

[0037] The ratio of the depth of the recess 41 to the thickness of the tab 32 may be 0.5, 0.6, 0.8, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 or 5, etc.

[0038] In one embodiment, along the length direction of the connecting piece 40, the ratio of the maximum length dimension of the recess 41 to the length dimension of the connecting piece 40 is 0.3-0.9, thereby ensuring that the portion of the connecting piece 40 forming the recess 41 can achieve reliable abutment against the pole lug 32, thereby ensuring the welding quality of the pole structure 20, the pole lug 32 and the connecting piece 40, and improving the connection strength of the pole structure 20, the pole lug 32 and the connecting piece 40.

[0039] The connecting piece 40 can have specific length and width directions. For example, the connecting piece 40 can be a rectangular body, and the extension direction of the side with relatively larger size of the rectangular body is the length direction, and the extension direction of the side with relatively smaller size of the rectangular body is the width direction; or, when the connecting piece 40 is a cube, the length dimension and the width dimension can be consistent, and the length direction and the width direction can be replaced arbitrarily; or, the connecting piece 40 can be a cylinder, in this case, the length direction and the width direction can be perpendicular to each other, and the length direction and the width direction can pass through the two radial directions of the cylinder.

[0040] The maximum length of the recess 41 is too small, and the pressure resistance of the connecting piece 40 on the pole lug 32 is relatively small, which cannot ensure the welding strength of the pole structure 20, the pole lug 32 and the connecting piece 40; while the maximum length of the recess 41 is too large, the formed weld mark 42 may be too close to the edge of the connecting piece 40, which will increase the risk of breakage of the connecting piece 40, which is not conducive to improving the welding strength of the pole structure 20, the pole lug 32 and the connecting piece 40.

[0041] After the tab 32 is straightened, the length direction of the connecting piece 40 can be parallel to the direction in which the tab 32 extends from the battery body 31, that is, the length direction of the connecting piece 40 can be parallel to the extension direction of the single tab of the tab 32 after it is straightened. Alternatively, after the tab 32 is straightened, the length direction of the connecting piece 40 can be perpendicular to the direction in which the tab 32 extends from the battery body 31, that is, the length direction of the connecting piece 40 can be perpendicular to the extension direction of the single tab of the tab 32 after it is straightened. For example, the connecting piece 40 can be a rectangular structure, and the outermost edge of the recess 41 can be a circle, and the length dimension of the connecting piece 40 can be obtained along the length direction of the rectangular structure, and accordingly, the diameter dimension of the circle obtained is the maximum length dimension of the recess 41.

[0042] Along the length direction of the connecting piece 40 , the ratio of the maximum length dimension of the recess 41 to the length dimension of the connecting piece 40 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, etc.

[0043] In one embodiment, the distance between the outermost edge of the recess 41 and the outermost edge of the connecting piece 40 is 1mm-15mm, which ensures that the recess 41 can occupy a certain area of ​​the connecting piece 40, thereby ensuring that the connecting piece 40 can form a reliable pressure on the pole ear 32, thereby improving the welding strength of the pole structure 20, the pole ear 32 and the connecting piece 40, and avoiding the risk of the connecting piece 40 being easily broken due to the outermost edge of the recess 41 and the outermost edge of the connecting piece 40 being too small, thereby improving the welding quality of the pole structure 20, the pole ear 32 and the connecting piece 40.

[0044] The outermost edge of the recess 41 is the location of the outer contour of the port of the recess 41 , and the outermost edge of the connecting piece 40 is the location of the outermost contour of the connecting piece 40 .

[0045] The distance between the outermost edge of the recess 41 and the outermost edge of the connecting piece 40 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm or 15 mm, etc. In one embodiment, as Figure 3As shown, the connecting piece 40 includes a non-welding area 43, which is arranged around the recess 41, so that the non-welding area 43 of the connecting piece 40 can be used for the convergence and positioning of the pole ear 32, and avoid the recess 41 occupying too large an area of ​​the connecting piece 40, which makes the connecting piece 40 easy to break.

[0046] In one embodiment, the outer contour of the non-welding area 43 is bent relative to the weld mark 42 toward a direction away from the pole lug 32, that is, the outer contour of the non-welding area 43 is bent outward relative to the pole lug 32, that is, at least a portion of the non-welding area 43 is bent relative to the weld mark 42 toward a side away from the pole lug 32. The non-welding area 43 can reduce the pressure on the pole lug 32, facilitate the subsequent contraction of the pole lug 32, prevent scratches on the pole lug 32, and at the same time avoid stress concentration in the non-welding weld mark area of ​​the pole lug 32, or the non-fixed position of the non-welding weld mark area of ​​the pole lug 32 may overlap with other structures inside the battery and cause short circuit risks, etc.

[0047] At least part of the non-welding area 43 is bent relative to the weld mark 42 toward a side away from the pole lug 32, that is, a gap may be formed between the non-welding area 43 and the pole lug 32; or, the non-welding area 43 may contact the pole lug 32, but the pressure between the two is relatively small.

[0048] In one embodiment, the ratio of the orthographic projection area of ​​the recess 41 on the connecting plate 40 to the area enclosed by the outermost edge of the connecting plate 40 is 0.1-0.8, so as to ensure reliable welding connection between the pole structure 20 and the pole ear 32 while avoiding the welding area being too large and close to the edge of the connecting plate 40, which may easily cause cold welding.

[0049] The edge of the connecting piece 40 will be bent on the outside after welding. Therefore, if the welding area is too large and close to the edge of the connecting piece 40, it is easy to cause a cold weld, while if the welding area is too small, it cannot play a role in stabilizing the welding. Therefore, the welding quality of the battery can be effectively improved by controlling the ratio of the positive projection area of ​​the recess 41 on the connecting piece 40 to the area enclosed by the outermost edge of the connecting piece 40.

[0050] The ratio of the orthographic projection area of ​​the recess 41 on the connecting sheet 40 to the area enclosed by the outermost edge of the connecting sheet 40 may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 or 0.8, etc.

[0051] In one embodiment, the weld mark 42 includes a circular weld mark, so that the circular weld mark can release stress and reduce the risk of tearing of the pole ear 32, thereby improving the current carrying capacity of the pole ear 32 and reducing the risk of short circuit between the pole ear 32 and other structures.

[0052] There are multiple circular weld marks, and the multiple circular weld marks are arranged at a position of the recess 41 close to the outermost edge of the recess 41 , thereby further improving the stress release capability and reducing the risk of the tab 32 being torn.

[0053] A plurality of circular weld marks are arranged at a position of the recess 41 close to the outermost edge of the recess 41 , that is, a plurality of circular weld marks are arranged at the edge position of the end of the recess 41 , thereby facilitating the circular weld marks to form stress release.

[0054] The weld mark 42 may include a plurality of circular weld marks and a plurality of rectangular weld marks.

[0055] In one embodiment, the weld mark 42 is an ultrasonic weld mark, that is, the pole structure 20, the pole lug 32 and the connecting piece 40 can be directly connected by ultrasonic welding, which not only simplifies the welding method but also ensures the welding quality between the pole structure 20, the pole lug 32 and the connecting piece 40.

[0056] The pole structure 20 , the pole ear 32 and the connecting piece 40 are welded by ultrasonic welding, and the welding head can be pressed against the connecting piece 40 to form a welding mark 42 .

[0057] The pole structure 20 , the pole ear 32 and the connecting piece 40 may be connected by torque welding.

[0058] In one embodiment, the ratio of the depth of the recess 41 to the thickness of the connecting piece 40 is 1-20. While ensuring that the connecting piece 40 can form a reliable pressure against the electrode ear 32, the strength of the connecting piece 40 can also be guaranteed, reducing the risk of the connecting piece 40 breaking, thereby improving the safe use performance of the battery.

[0059] The ratio of the depth of the recess 41 to the thickness of the connecting piece 40 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19 or 20, etc.

[0060] The thickness of the connecting piece 40 can be directly measured using conventional measuring tools, for example, using a vernier caliper to clamp the edge area of ​​the connecting piece 40 to obtain the thickness of the connecting piece 40. Once the thickness of the connecting piece 40 is obtained, the non-welding area of ​​the connecting piece 40 can be selected.

[0061] In one embodiment, Figure 1As shown, the housing structure 10 may include a cover plate 12 and a shell member 11 , and the cover plate 12 and the shell member 11 may be welded together. Two pole structures 20 may be provided on the cover plate 12 , and the two pole structures 20 may be connected to two pole ears 32 respectively.

[0062] Combination Figure 5 As shown, two pole ears 32 can be provided on the battery body 31, and the two pole ears 32 are respectively connected to the two pole column structures 20. The two pole ears 32 can be a positive pole ear and a negative pole ear respectively, and the two pole column structures 20 can be a positive pole column structure and a negative pole column structure respectively.

[0063] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0064] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0065] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0066] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0067] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0068] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0069] The battery of the battery pack of one embodiment of the utility model comprises a shell structure 10, a pole structure 20, a battery cell 30 and a connecting piece 40, wherein the pole structure 20 is arranged on the shell structure 10, and the battery cell 30 is arranged in the shell structure 10, so that the pole structure 20 and the battery cell 30 can be electrically connected. The pole ear 32 on the battery body 31 is in direct contact with the pole structure 20, and the pole structure 20, the pole ear 32 and the connecting piece 40 are welded, so that the connection stability of the pole ear 32 and the pole structure 20 can be ensured, and due to the existence of the connecting piece 40, the abutment stability between the directly contacting pole ear 32 and the pole structure 20 can be ensured, so that the welding quality of the pole ear 32 and the pole structure 20 can be ensured. A recess 41 is formed on the side of the connecting piece 40 facing away from the pole ear 32, and a weld mark 42 is formed in the recess 41, which can facilitate the positioning of the welding head during the welding process, thereby improving the welding efficiency of the pole structure 20, the pole ear 32 and the connecting piece 40, and can also release stress through the connecting piece 40 to reduce the risk of welding failure, thereby improving the safe use performance of the battery pack.

[0070] In one embodiment, the battery pack is a battery module or a battery pack.

[0071] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

[0072] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0073] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0074] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: Shell structure (10); A pole structure (20), the pole structure (20) being arranged on the shell structure (10); A battery cell (30), the battery cell (30) being arranged in the shell structure (10), the battery cell (30) comprising a battery cell body (31) and a pole ear (32), the pole ear (32) extending from the battery cell body (31), the pole ear (32) being in direct contact and electrically connected with the pole structure (20); A connecting piece (40), wherein the connecting piece (40) is arranged on a side of the pole ear (32) away from the pole structure (20), and the connecting piece (40) is arranged to protrude toward the pole ear (32) to form a recess (41) on the side of the connecting piece (40) away from the pole ear (32), and the pole structure (20), the pole ear (32) and the connecting piece (40) are welded to form a weld mark (42) in the recess (41).

2. The battery according to claim 1, characterized in that The weld mark (42) is formed with a pit, and the ratio of the depth of the depression (41) to the depth of the pit is 0.3-6.

3. The battery according to claim 1, characterized in that The ratio of the depth of the recess (41) to the thickness of the tab (32) is 0.5-5.

4. The battery according to claim 1, characterized in that Along the length direction of the connecting piece (40), the ratio of the maximum length dimension of the recess (41) to the length dimension of the connecting piece (40) is 0.3-0.

9.

5. The battery according to claim 1, characterized in that The distance between the outermost edge of the recess (41) and the outermost edge of the connecting piece (40) is 1 mm to 15 mm.

6. The battery according to any one of claims 1 to 5, characterized in that The connecting piece (40) comprises a non-welding area (43), and the non-welding area (43) is arranged around the recess (41); The outer contour of the non-welding area (43) is bent relative to the welding mark (42) in a direction away from the pole ear (32).

7. The battery according to any one of claims 1 to 5, characterized in that The ratio of the orthographic projection area of ​​the recess (41) on the connecting piece (40) to the area enclosed by the outermost edge of the connecting piece (40) is 0.1-0.

8.

8. The battery according to any one of claims 1 to 5, characterized in that The weld mark (42) comprises a circular weld mark; There are multiple circular weld marks, and the multiple circular weld marks are arranged at positions of the recess (41) close to the outermost edge of the recess (41).

9. The battery according to any one of claims 1 to 5, characterized in that The welding mark (42) is an ultrasonic welding mark.

10. The battery according to any one of claims 1 to 5, characterized in that The ratio of the depth of the recess (41) to the thickness of the connecting sheet (40) is 1-20.

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