Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell, the pole is arranged on the battery shell; the battery cell is arranged in the battery shell, the battery cell comprises a battery cell main body and a pole lug, the pole lug extends out of the battery cell main body, the pole lug is directly welded and connected with the pole column so as to form a welding mark on the pole lug, and the welding mark comprises a first welding mark and a second welding mark; wherein the ratio of the area defined by the circumferential outer edge of the single first welding mark to the area defined by the circumferential outer edge of the single second welding mark is 0.02-28, and / or the first welding mark is provided with a first recess, the second welding mark is provided with a second recess, the ratio of the depth of the first recess to the depth of the second recess is 0.55-0.95, and the ratio of the depth of the first recess to the depth of the second recess is 0.55-0.95. The welding quality of the tab and the pole can be ensured, the connection stability of the tab and the pole can be ensured, and the overcurrent capability between the tab and the pole can be ensured, so that the safe use performance of the battery is ensured.

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 cell and a pole, and the pole is used to be welded to the pole lug of the cell, thereby being used as an electrode lead-out terminal to facilitate the charging and discharging of the battery. However, due to the limitation of the welding structure, the connection strength between the pole lug and the pole is relatively poor, which in turn affects the safe use performance of the battery. 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] Battery housing;

[0006] A pole, which is arranged on the battery housing;

[0007] The battery cell is arranged in the battery housing, and comprises a battery cell body and a pole ear, wherein the pole ear extends from the battery cell body, and the pole ear is directly welded to the pole post to form a weld mark on the pole ear, and the weld mark comprises a first weld mark and a second weld mark;

[0008] Among them, the ratio of the area enclosed by the circumferential outer edge of a single first weld mark to the area enclosed by the circumferential outer edge of a single second weld mark is 0.02-28, and / or, the first weld mark forms a first depression, the second weld mark forms a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95.

[0009] The battery of the utility model embodiment includes a battery housing, a pole and a battery cell, the pole is arranged on the battery housing, the battery cell is arranged in the battery housing, and the pole and the battery cell are electrically connected. The pole lug on the battery cell body can be directly welded and connected to the pole, thereby reducing the number of components used in the battery, and also ensuring the connection strength between the pole lug and the pole. By welding the pole lug and the pole to form a first weld mark and a second weld mark, and the ratio of the area surrounded by the circumferential outer edge of a single first weld mark to the area surrounded by the circumferential outer edge of a single second weld mark is 0.02-28, and / or, the first weld mark is formed with a first depression, the second weld mark is formed with a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95, which can not only ensure the welding quality of the pole lug and the pole, ensure the connection stability of the pole lug and the pole, but also ensure the current capacity between the pole lug and the pole, thereby ensuring 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 schematic structural diagram of a battery cell according to an exemplary embodiment;

[0014] Figure 4 The figure is a schematic structural diagram of a tab and a weld mark of a battery cell according to an exemplary embodiment.

[0015] The following are the descriptions of the reference numerals:

[0016] 10. Battery case; 11. Case member; 12. Cover plate; 20. Post; 30. Cell; 31. Cell body; 32. Tab; 33. First weld mark; 34. Second weld mark. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 4 The battery comprises: a battery case 10; a pole 20, the pole 20 is arranged on the battery case 10; a battery cell 30, the battery cell 30 is arranged in the battery case 10, the battery cell 30 comprises a battery cell body 31 and a pole ear 32, the pole ear 32 extends from the battery cell body 31, the pole ear 32 is directly welded to the pole 20 to form a weld mark on the pole ear 32, the weld mark comprises a first weld mark 33 and a second weld mark 34; wherein, the ratio of the area enclosed by the circumferential outer edge of a single first weld mark 33 to the area enclosed by the circumferential outer edge of a single second weld mark 34 is 0.02-28, and / or, the first weld mark 33 is formed with a first depression, the second weld mark 34 is formed with a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95.

[0022] A battery in one embodiment of the utility model includes a battery housing 10, a pole 20 and a battery cell 30, wherein the pole 20 is disposed on the battery housing 10, the battery cell 30 is disposed in the battery housing 10, and the pole 20 and the battery cell 30 are electrically connected. The pole tab 32 on the battery cell body 31 can be directly welded to the pole 20, thereby reducing the number of components used in the battery and ensuring the connection strength between the pole tab 32 and the pole 20. The first weld mark 33 and the second weld mark 34 are formed by welding the pole lug 32 to the pole post 20, and the ratio of the area enclosed by the circumferential outer edge of a single first weld mark 33 to the area enclosed by the circumferential outer edge of a single second weld mark 34 is 0.02-28, and / or the first weld mark 33 is formed with a first depression, the second weld mark 34 is formed with a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95. This can not only ensure the welding quality of the pole lug 32 and the pole post 20, ensure the connection stability of the pole lug 32 and the pole post 20, but also ensure the current flow capacity between the pole lug 32 and the pole post 20, thereby ensuring the safe use performance of the battery.

[0023] It should be noted that the battery case 10 protects the battery cell 30 , and the pole 20 disposed on the battery case 10 is used as the charging and discharging end of the battery, and the battery cell 30 is electrically connected to the pole 20 , thereby realizing the charging and discharging of the battery.

[0024] The pole tab 32 is directly welded to the pole post 20 , that is, there is no need to provide an adapter plate between the pole tab 32 and the pole post 20 for adapter connection, and the adapter plate can be omitted, thereby reducing the number of battery components used and improving the overall energy density of the battery.

[0025] like Figure 2 and 4 As shown, the pole lug 32 is directly welded to the pole post 20 to form a weld mark on the pole lug 32, and the weld mark includes a first weld mark 33 and a second weld mark 34, and the ratio of the area enclosed by the circumferential outer edge of a single first weld mark 33 to the area enclosed by the circumferential outer edge of a single second weld mark 34 is 0.02-28, thereby ensuring that the first weld mark 33 and the second weld mark 34 with inconsistent areas can release stress while ensuring the welding quality of the pole lug 32 and the pole post 20, thereby reducing the risk of unstable connection between the pole lug 32 and the pole post 20, thereby improving the safe use performance of the battery.

[0026] 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 20, 21, 22, 23, 23.5, 24, 25, 26, 27 or 28, etc.

[0027] The first weld mark 33 forms a first depression, and the second weld mark 34 forms a second depression. The ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95. The second weld mark 34 with a relatively large depth can ensure the welding quality of the pole ear 32 and the pole 20, ensure the connection strength between the pole ear 32 and the pole 20, reduce the risk of unstable connection between the pole ear 32 and the pole 20, and thus improve the safe use performance of the battery. The first weld mark 33 with a relatively small depth can form stress release and reduce the risk of tearing of the pole ear 32.

[0028] The ratio of the depth of the first recess to the depth of the second recess may be 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, 0.9, 0.92 or 0.95, etc.

[0029] The first weld mark 33 is formed with a first depression, and the depth of the first depression can be considered as the maximum depth of the first depression; the second weld mark 34 is formed with a second depression, and the depth of the second depression can be considered as the maximum depth of the second depression.

[0030] In one embodiment, the shapes of the first weld mark 33 and the second weld mark 34 may be consistent. For example, the first weld mark 33 and the second weld mark 34 may both be circular, or the first weld mark 33 and the second weld mark 34 may both be polygonal.

[0031] In one embodiment, Figure 2 and 4 As shown, the shapes of the first weld mark 33 and the second weld mark 34 are not consistent, and thus the welding quality of the pole tab 32 and the pole 20 can be controlled by the first weld mark 33 and the second weld mark 34 of different shapes, thereby ensuring the connection strength between the pole tab 32 and the pole 20.

[0032] In one embodiment, the first weld mark 33 is a circular weld mark, which can not only control the welding quality between the pole ear 32 and the pole 20, but also avoid the stress concentration of the pole ear 32, which leads to an increased risk of tearing between the weld mark area and the non-weld mark area, thereby ensuring the safe use performance of the battery.

[0033] The first weld mark 33 is a circular weld mark, which here means that it is basically circular. After all, it cannot be ruled out that the structural shape may be deformed during the welding process.

[0034] In one embodiment, the second weld mark 34 is a polygonal weld mark, so that the connection strength between the pole lug 32 and the pole post 20 can be controlled by the second weld mark 34, thereby ensuring the fixing performance between the pole lug 32 and the pole post 20, and reducing the risk of poor welding between the pole lug 32 and the pole post 20, thereby improving the safe use performance of the battery.

[0035] In one embodiment, the first weld mark 33 is a circular weld mark, the second weld mark 34 is a polygonal weld mark, the pole ear 32 is directly welded to the pole column 20, the stress concentration is more serious, and the welding depth is greater, therefore, the risk of tearing of the weld mark edge of the pole ear 32 is increased, and the setting of the circular weld mark can avoid the stress concentration of the pole ear 32, which leads to an increased risk of tearing between the weld mark area and the non-weld mark area. The area of ​​the circular weld mark is different from the area of ​​the polygonal weld mark, and the depth of the polygonal weld mark is deeper than that of the circular weld mark. The polygonal weld mark can ensure welding fixation, and the deeper depth prevents false welding, thereby improving the connection stability between the pole ear 32 and the pole column 20.

[0036] In one embodiment, the second weld mark 34 is a rectangular weld mark, which not only facilitates the welding of the pole lug 32 and the pole 20, but also ensures that the pole lug 32 and the pole 20 have sufficient welding area, thereby ensuring the connection stability between the pole lug 32 and the pole 20, thereby reliably controlling the current capacity between the pole lug 32 and the pole 20.

[0037] The second weld mark 34 is a rectangular weld mark, which means that it is basically rectangular. After all, it cannot be ruled out that the structural shape may be deformed during the welding process.

[0038] Combination Figure 4 As shown, the first weld mark 33 is a circular weld mark, and the second weld mark 34 is a rectangular weld mark. The first weld mark 33 can release the corresponding stress, and the rectangular weld mark can ensure the fixing ability between the pole ear 32 and the pole 20, thereby reliably improving the safe use performance of the battery.

[0039] Both the circular weld mark and the rectangular weld mark can be considered as the shape surrounded by the edge, and can further be considered as the shape of the positive projection on the pole ear 32.

[0040] In one embodiment, there are multiple first weld marks 33 and multiple second weld marks 34, so that the welding fixing ability between the pole lug 32 and the pole 20 can be effectively guaranteed, and the risk of stress concentration can be reduced to achieve dispersed release of stress, thereby effectively ensuring the connection stability between the pole lug 32 and the pole 20, and reducing the risk of tearing of the pole lug 32.

[0041] The weld marks may include multiple first weld marks 33 and multiple second weld marks 34, thereby avoiding the risk of a single weld mark being too large and easily damaging the pole lug 32, and also allowing space for stress release between the single weld marks, thereby ensuring the welding quality between the pole lug 32 and the pole 20.

[0042] In one embodiment, Figure 4 As shown, the multiple second weld marks 34 are located inside the area surrounded by the multiple first weld marks 33, so that the multiple second weld marks 34 can ensure the welding and fixing ability between the pole ear 32 and the pole 20, and the multiple first weld marks 33 can form stress release and reduce the stress concentration on the pole ear 32, thereby avoiding the risk of tearing of the pole ear 32, thereby improving the safe use performance of the battery.

[0043] In one embodiment, multiple first weld marks 33 are arranged along the circumference, that is, multiple first weld marks 33 are arranged in a circular direction. Multiple first weld marks 33 can be arranged to form a roughly circular ring shape, so that the area formed after the pole ear 32 and the pole post 20 are welded can be roughly a circular area, which can not only ensure the welding strength between the pole ear 32 and the pole post 20, but also effectively realize stress concentration on the pole ear 32, thereby avoiding the risk of tearing of the pole ear 32, thereby improving the safe use performance of the battery.

[0044] The first weld mark 33 may be a circular weld mark, the second weld mark 34 may be a rectangular weld mark, and a plurality of circular weld marks are arranged to form a circular ring shape, while a plurality of rectangular weld marks are located on the inner side of the circular ring shape. This can reduce the risk of damage to the tab 32 while ensuring the welding quality, thereby ensuring the safe use performance of the battery.

[0045] The first weld marks 33 and the second weld marks 34 may be arranged at intervals, two adjacent first weld marks 33 may be arranged at intervals, and two adjacent second weld marks 34 may be arranged at intervals. A plurality of circular weld marks are arranged to form a circular ring shape, which can be considered as a circular ring shape formed by connecting the outer circumference and the inner circumference of the plurality of first weld marks 33. The focus is still on explaining that the plurality of first weld marks 33 are arranged in a circular direction.

[0046] In one embodiment, the ratio of the total number of first weld marks 33 to the total number of second weld marks 34 is 0.5-10, which ensures that stress can be effectively released while also ensuring the welding strength between the tab 32 and the pole 20, thereby ensuring the safe use performance of the battery.

[0047] If the ratio of the total number of the first weld marks 33 to the total number of the second weld marks 34 is too small, there are too many second weld marks 34 in the middle and fewer first weld marks 33 on the periphery, the stress release is incomplete and the pole lug 32 is easily torn; if the ratio of the total number of the first weld marks 33 to the total number of the second weld marks 34 is too large, there are too few second weld marks 34 in the middle, the welding strength is insufficient, and the pole lug 32 and the pole 20 are easily separated.

[0048] The ratio of the total number of first weld marks 33 to the total number of second weld marks 34 can be 0.5, 0.6, 0.8, 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 or 10, etc.

[0049] In one embodiment, the ratio of the depth of the second recess to the thickness of the pole lug 32 is 0.6-1.2, so that the second weld mark 34 can effectively ensure the fixing performance between the pole lug 32 and the pole 20, reduce the probability of cold welding between the pole lug 32 and the pole 20, and further reduce the risk of connection failure, thereby improving the safe use performance of the battery.

[0050] The tab 32 may include a plurality of single-piece tabs, and the thickness of the tab 32 is the total thickness of the plurality of single-piece tabs.

[0051] The ratio of the depth of the second recess to the thickness of the tab 32 may be 0.6, 0.7, 0.8, 0.9, 1, 1.1 or 1.2, etc.

[0052] In one embodiment, the positive projection of the weld mark on the pole lug 32 is a centrally symmetrical figure, which not only facilitates the welding connection between the pole lug 32 and the pole 20, but also enables each position of the weld mark formed between the pole lug 32 and the pole 20 to have a relatively balanced connection capability, and can also effectively control the current flow capacity between the pole lug 32 and the pole 20.

[0053] The orthographic projection of the weld mark on the pole ear 32 is a figure formed by the orthographic projections of multiple first weld marks 33 and multiple second weld marks 34 on the pole ear 32, and the figure is a centrally symmetrical figure, that is, the figure is rotated 180° around a certain point, and the rotated figure can coincide with the original figure.

[0054] In one embodiment, the ratio of the orthographic projection area of ​​the weld mark on the pole lug 32 to the largest surface area of ​​the pole lug 32 having the weld mark is 0.005-0.25, which can not only ensure that the weld mark can stably connect the pole lug 32 and the pole 20, but also avoid the weld mark area on the pole lug 32 being too large, which may easily cause damage to the pole lug 32.

[0055] The large surface area of ​​the electrode tab 32 with the weld mark can be considered as the large surface area of ​​the single-piece electrode tab where the electrode tab 32 is located on the outermost side. When measuring, the single-piece electrode tab can be flattened to measure the area.

[0056] The ratio of the orthographic projection area of ​​the weld mark on the pole ear 32 to the large surface area of ​​the pole ear 32 with the weld mark is too large. The weld mark area is too large and too close to the edge of the pole ear 32, which may easily cause the edge of the pole ear 32 to tear; the ratio of the orthographic projection area of ​​the weld mark on the pole ear 32 to the large surface area of ​​the pole ear 32 with the weld mark is too small. The weld mark is too small, and the pole ear 32 and the pole column 20 are poorly welded, which may easily cause the risk of detachment.

[0057] The ratio of the orthographic projection area of ​​the welding mark on the pole ear 32 to the large surface area of ​​the pole ear 32 having the welding mark is 0.005, 0.006, 0.008, 0.01, 0.015, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24 or 0.25, etc.

[0058] In one embodiment, the minimum distance between the weld mark and the circumferential outer edge of the pole lug 32 is 1 mm-30 mm, which can not only ensure the current flow capacity between the pole lug 32 and the pole 20, but also control the connection capacity between the single-piece pole lugs of the pole lug 32, thereby ensuring the current flow capacity and structural strength of the pole lug 32.

[0059] The pole lug 32 may be composed of a plurality of single-piece pole lugs. Due to the problem of different lengths at the edges of the pole lug 32, if the weld mark is too close to the edge of the pole lug 32, there is a possibility that some single-piece pole lugs may not form an electrical connection with the pole 20, which is not conducive to ensuring the current carrying capacity between the pole lug 32 and the pole 20.

[0060] The minimum distance between the weld mark and the circumferential outer edge of the tab 32 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm, etc.

[0061] In one embodiment, the weld mark is an ultrasonic weld mark, that is, the pole tab 32 and the pole post 20 can be directly connected by ultrasonic welding, which not only simplifies the welding method but also ensures the welding quality between the pole tab 32 and the pole post 20 .

[0062] The pole lug 32 and the pole post 20 are ultrasonically welded, so that the first weld mark 33 and the second weld mark 34 with inconsistent shapes can be easily formed. By controlling the shape, area and depth of the first weld mark 33 and the second weld mark 34, the risk of tearing of the pole lug 32 can be reduced on the basis of controlling stress concentration, thereby ensuring the connection strength between the pole lug 32 and the pole post 20.

[0063] The pole lug 32 and the pole post 20 may be connected by torque welding.

[0064] It should be noted that the pole lug 32 and the pole post 20 are welded by ultrasonic welding. During welding, a welding head including protrusions of different shapes can be used. For example, the welding head can include multiple circular protrusions and multiple rectangular protrusions. After welding the pole lug 32 and the pole post 20, a first weld mark 33 and a second weld mark 34 can be formed.

[0065] In one embodiment, there are multiple first weld marks 33 and multiple second weld marks 34, and the ratio of the distance between two adjacent first weld marks 33 to the distance between two adjacent second weld marks 34 is 0.1-10. On the basis of reducing the risk of tearing of the pole ear 32, reliable stress release of the pole ear 32 can also be ensured.

[0066] The ratio of the distance between two adjacent first weld marks 33 to the distance between two adjacent second weld marks 34 is too small, the spacing between the first weld marks 33 is too small, and the dense first weld marks 33 are prone to cause tearing of the pole ear 32; the ratio of the distance between two adjacent first weld marks 33 to the distance between two adjacent second weld marks 34 is too large, and the spacing between the first weld marks 33 is too large to play a role in buffering edge stress, which is not conducive to ensuring the stability of the pole ear 32.

[0067] The ratio of the distance between two adjacent first weld marks 33 to the distance between two adjacent second weld marks 34 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 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 or 10, etc.

[0068] In one embodiment, Figure 1 As shown, the battery housing 10 may include a cover plate 12 and a housing member 11 , and the cover plate 12 and the housing member 11 may be welded together. Two poles 20 may be disposed on the cover plate 12 , and the two poles 20 may be connected to two pole ears 32 , respectively.

[0069] Combination Figure 3 As shown, two pole ears 32 may be provided on the battery body 31, and the two pole ears 32 are respectively connected to the two pole posts 20, the two pole ears 32 may be a positive pole ear and a negative pole ear, and the two pole posts 20 may be a positive pole post and a negative pole post, respectively.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0076] The battery of the battery pack of one embodiment of the utility model comprises a battery housing 10, a pole 20 and a battery cell 30, wherein the pole 20 is arranged on the battery housing 10, the battery cell 30 is arranged in the battery housing 10, and the pole 20 and the battery cell 30 are electrically connected. The pole tab 32 on the battery cell body 31 can be directly welded to the pole 20, thereby reducing the number of battery components used and ensuring the connection strength between the pole tab 32 and the pole 20. The first weld mark 33 and the second weld mark 34 are formed by welding the pole lug 32 to the pole post 20, and the ratio of the area enclosed by the circumferential outer edge of a single first weld mark 33 to the area enclosed by the circumferential outer edge of a single second weld mark 34 is 0.02-28, and / or the first weld mark 33 is formed with a first depression, the second weld mark 34 is formed with a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.95. This can ensure not only the welding quality of the pole lug 32 and the pole post 20, but also the connection stability of the pole lug 32 and the pole post 20, and the current passing capacity between the pole lug 32 and the pole post 20 can be ensured, thereby ensuring the safe use performance of the battery pack.

[0077] In one embodiment, the battery pack is a battery module or a battery pack.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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: A battery housing (10); A pole (20), the pole (20) being arranged on the battery housing (10); A battery cell (30), the battery cell (30) being arranged in the battery housing (10), the battery cell (30) comprising a battery cell body (31) and a pole lug (32), the pole lug (32) extending from the battery cell body (31), the pole lug (32) being directly welded to the pole (20) to form a weld mark on the pole lug (32), the weld mark comprising a first weld mark (33) and a second weld mark (34); The ratio of the area enclosed by the circumferential outer edge of a single first weld mark (33) to the area enclosed by the circumferential outer edge of a single second weld mark (34) is 0.02-28, and / or the first weld mark (33) is formed with a first depression, the second weld mark (34) is formed with a second depression, and the ratio of the depth of the first depression to the depth of the second depression is 0.55-0.

95.

2. The battery according to claim 1, characterized in that The first welding mark (33) is a circular welding mark, and / or the second welding mark (34) is a polygonal welding mark.

3. The battery according to claim 1, characterized in that The shapes of the first weld mark (33) and the second weld mark (34) are not consistent.

4. The battery according to any one of claims 1 to 3, characterized in that The first welding marks (33) are multiple, and the second welding marks (34) are multiple; Wherein, the plurality of the second welding marks (34) are located inside the area surrounded by the plurality of the first welding marks (33).

5. The battery according to claim 4, characterized in that A plurality of the first weld marks (33) are arranged along the circumference.

6. The battery according to claim 4, characterized in that The ratio of the total number of the first weld marks (33) to the total number of the second weld marks (34) is 0.5-10.

7. The battery according to any one of claims 1 to 3, characterized in that The ratio of the depth of the second recess to the thickness of the pole ear (32) is 0.6-1.

2.

8. The battery according to any one of claims 1 to 3, characterized in that The ratio of the orthographic projection area of ​​the weld mark on the pole ear (32) to the large surface area of ​​the pole ear (32) having the weld mark is 0.005-0.

25.

9. The battery according to any one of claims 1 to 3, characterized in that The minimum distance between the weld mark and the circumferential outer edge of the pole lug (32) is 1 mm to 30 mm.

10. The battery according to any one of claims 1 to 3, characterized in that There are a plurality of the first welding marks (33), there are a plurality of the second welding marks (34), and the ratio of the distance between two adjacent first welding marks (33) to the distance between two adjacent second welding marks (34) is 0.1-10.

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