Battery and welding equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery and welding equipment. The battery includes: a battery case; 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, and the pole lug is directly welded and connected with the pole column; wherein a plurality of pits are formed in one end, deviating from the tab, of the pole, the ratio of the depth of the pits to the thickness of the tab is 0.015-3, the stability of the pole in the welding process can be effectively controlled by adjusting the relation between the depth of the pits and the thickness of the tab, so that the welding of the tab and the pole is more stable, and the high-quality welding effect can be ensured; and the safe use performance of the battery is further improved.

Description

Technical Field

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

[0002] In the related art, the pole of the battery and the lug of the battery cell are connected by welding. When welding, welding equipment is used for welding. During the welding process, the pole may move relative to the welding seat, which will affect the welding quality of the pole and the lug. Utility Model Content

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

[0004] According to a first aspect of the present utility model, there is provided 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, the pole ear extends from the battery cell body, and the pole ear is directly welded to the pole;

[0008] Among them, a plurality of pits are arranged at one end of the pole away from the pole ear, and the ratio of the depth of the pits to the thickness of the pole ear is 0.015-3.

[0009] The battery of one embodiment of the utility model includes a battery housing, a pole and a battery cell, and the pole arranged on the battery housing is electrically connected to the battery cell arranged in the battery housing. The pole lug on the battery cell body is directly welded to the pole lug, thereby reducing the number of components used in the battery and improving the connection efficiency between the pole lug and the pole lug. By providing a plurality of pits at one end of the pole lug away from the pole lug, when the pole lug and the pole lug are directly welded, the plurality of pits can form a reliable contact with the welding seat, avoiding relative displacement of the pole lug and affecting the welding quality of the pole lug and the pole lug, and the ratio of the depth of the pit to the thickness of the pole lug is 0.015-3. By adjusting the relationship between the depth of the pit and the thickness of the pole lug, the stability of the pole lug during the welding process can be effectively controlled, so that the welding of the pole lug and the pole lug is more stable, thereby ensuring a high-quality welding effect, and thus improving the safe use performance of the battery.

[0010] According to a second aspect of the present utility model, a welding device is provided for welding the above-mentioned battery, the welding device comprising:

[0011] Welding head;

[0012] A welding seat is provided with a plurality of protrusions, and the plurality of protrusions are used to match the plurality of pits.

[0013] The welding equipment of one embodiment of the utility model includes a welding head and a welding seat. In the process of welding the pole and the battery cell, the pole is pressed against the welding seat, and the welding head can be directed toward the pole ear on the battery cell body, thereby realizing direct welding connection between the pole ear and the pole. By providing a plurality of convex points on the welding seat, it can be ensured that the pole and the welding seat can have a relatively stable positional relationship, and a plurality of pits provided at one end of the pole away from the pole ear can be matched with a plurality of convex points, thereby enhancing the contact ability between the pole and the welding seat, avoiding relative displacement of the pole, thereby ensuring the welding efficiency between the pole ear and the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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:

[0015] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0016] Figure 2 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0017] Figure 3 is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0018] Figure 4 It is a schematic structural diagram of a welding head and a welding seat of a welding device according to an exemplary embodiment.

[0019] The following are the descriptions of the reference numerals:

[0020] 10. Battery case; 11. Case member; 12. Cover plate; 20. Post; 21. Concave pit; 22. Positioning hole; 30. Battery cell; 31. Battery cell body; 32. Tab; 33. Welding mark; 40. Welding head; 41. First protrusion; 42. Second protrusion; 50. Welding seat; 51. Bump. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] An embodiment of the present invention provides a battery. Figures 1 to 3 The battery comprises: a battery shell 10; a pole 20, which is arranged on the battery shell 10; a battery cell 30, which is arranged in the battery shell 10, and the battery cell 30 comprises a battery body 31 and a pole ear 32, the pole ear 32 extends from the battery body 31, and the pole ear 32 is directly welded to the pole 20; wherein, a plurality of pits 21 are arranged at one end of the pole 20 away from the pole ear 32, and the ratio of the depth of the pit 21 to the thickness of the pole ear 32 is 0.015-3.

[0026] 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 disposed on the battery housing 10 is electrically connected to the battery cell 30 disposed in the battery housing 10. The pole tab 32 on the battery cell body 31 is directly welded to the pole 20, thereby reducing the number of components used in the battery and improving the connection efficiency between the pole tab 32 and the pole 20. By providing a plurality of pits 21 at the end of the pole 20 away from the pole ear 32, when the pole ear 32 is directly welded to the pole 20, the plurality of pits 21 can form a reliable contact with the welding seat, thereby avoiding relative displacement of the pole 20 and affecting the welding quality of the pole ear 32 and the pole 20. The ratio of the depth of the pit 21 to the thickness of the pole ear 32 is 0.015-3. By adjusting the relationship between the depth of the pit 21 and the thickness of the pole ear 32, the stability of the pole 20 during the welding process can be effectively controlled, so that the welding of the pole ear 32 and the pole 20 is more stable, thereby ensuring a high-quality welding effect, and thereby improving the safe use performance of the battery.

[0027] It should be noted that the pole lug 32 is directly welded to the pole post 20, that is, the pole lug 32 and the pole post 20 may be connected without an adapter, thereby eliminating the adapter, thereby reducing the number of battery components and improving the overall energy density of the battery. When the batteries are grouped, adjacent batteries may be electrically connected via a bus bar, and the bus bar may be welded to the pole post 20.

[0028] During the welding process between the pole lug 32 and the pole 20, the pole 20 can be pressed against the welding seat, and the welding head can be facing the pole lug 32. During the direct welding process between the pole lug 32 and the pole 20, the stability of the pole 20 needs to be ensured to avoid relative displacement of the pole 20 affecting the welding quality. The thickness of the pole lug 32 is related to the depth of the pit 21. The greater the thickness of the pole lug 32, the deeper the depth of the pit 21, which ensures that the relative position of the pole 20 does not change. At the same time, the pit 21 is conducive to the subsequent welding with the bus bar, improving the welding efficiency of the two. When the thickness of the pole lug 32 is certain and the depth of the pit 21 is too large, it will affect the quality of the welding between the pole 20 and the bus bar. When the depth of the pit 21 is too small, the limiting of the pole 20 during the welding process cannot be guaranteed. The above risks can be effectively controlled by setting the ratio of the depth of the pit 21 to the thickness of the pole lug 32 to 0.015-3.

[0029] The ratio of the depth of the pit 21 to the thickness of the tab 32 can be 0.015, 0.016, 0.017, 0.018, 0.019, 0.02, 0.025, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2,

[0032] 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3 and so on.

[0033] The depth of the pit 21 can be considered as the maximum depth of the pit 21 . The tab 32 is composed of a plurality of single-piece tabs, and the thickness of the tab 32 is the total thickness of the plurality of single-piece tabs.

[0034] In one embodiment, the ratio of the depth of the pit 21 to the thickness of the pole lug 32 is 0.05-1, which can not only ensure the stability of the pole 20 during welding, and then ensure the welding fixing strength between the pole lug 32 and the pole 20, but also will not cause damage to the pole lug 32 or the pole 20 during the welding process.

[0035] In one embodiment, the ratio of the depth of the pit 21 to the height of the pole 20 is 0.005-0.1, which can not only ensure that the pit 21 can be reliably fixed to the welding seat and ensure the welding weight between the lug 32 and the pole 20, but also avoid the depth of the pit 21 being too large, affecting the structural strength and current carrying capacity of the pole 20, thereby effectively improving the safe use performance of the battery.

[0036] If the ratio of the depth of the pit 21 to the height of the pole 20 is too small, the fixing effect of the pole 20 during the welding process is poor. If the ratio of the depth of the pit 21 to the height of the pole 20 is too large, it will easily cause a cold weld when welding the pole 20 and the busbar, resulting in poor welding strength.

[0037] The ratio of the depth of the pit 21 to the height of the pole 20 can be 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.025, 0.03, 0.04, 0.05, 0.06, 0.07,

[0039] 0.08, 0.09, 0.1 and so on.

[0040] In one embodiment, the depths of at least two pits 21 are inconsistent, so that the pressure at each position of the pole 20 and the welding seat can be controlled to avoid damage to the pole 20 due to the force, thereby ensuring the welding quality between the pole lug 32 and the pole 20, and then ensuring the connection strength between the pole lug 32 and the pole 20, and ensuring the current flow capacity between the pole lug 32 and the pole 20.

[0041] In one embodiment, the depths of the plurality of pits 21 gradually decrease from the center of the pole 20 toward the circumferential outer edge of the pole 20, thereby ensuring that the central area of ​​the pole 20 can be subjected to relatively large forces, and also avoiding crushing of the pole lug 32 during welding, thereby reducing the risk of the pole lug 32 being torn due to excessive forces near the circumferential area.

[0042] The end of the pole 20 away from the pole ear 32 may be substantially a circular surface. In this case, the depths of the plurality of pits 21 may gradually decrease along the radial direction of the circular surface.

[0043] In one embodiment, Figure 1 and Figure 2 As shown, a positioning hole 22 is provided at one end of the pole 20 away from the pole ear 32, and a plurality of pits 21 are provided around the positioning hole 22; wherein, the port area of ​​the positioning hole 22 is larger than the port area of ​​a single pit 21, thereby ensuring that the positioning hole 22 has a reliable positioning capability. For example, during the welding process between the bus bar and the pole 20, the positioning of the bus bar can be achieved through the positioning hole 22, thereby ensuring the rapid positioning of the bus bar and the pole 20, improving the connection efficiency between the bus bar and the pole 20, and further improving the battery grouping efficiency.

[0044] The end of the positioning hole 22 is the opening of the positioning hole 22 at the end surface of the pole 20 away from the pole ear 32 , and the end of the pit 21 is the opening of the pit 21 at the end surface of the pole 20 away from the pole ear 32 .

[0045] In one embodiment, the ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 is 1.2-2000, which can not only ensure that the pit 21 can effectively position the pole 20 during the welding process, ensure the welding quality between the pole 20 and the pole lug 32, and improve the fixing ability between the pole 20 and the pole lug 32, but also the positioning hole 22 can facilitate the positioning of the bus, which can facilitate the subsequent grouping of batteries.

[0046] If the ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 is too large, it will affect the quality of the fixed pole 20, making the pole 20 easy to rotate during the welding process, which is not conducive to ensuring the welding effect between the pole 20 and the pole ear 32; if the ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 is too small, it will be not conducive to the positioning of the busbar and the improvement of the connection efficiency between the pole 20 and the busbar.

[0047] The ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 can be 1.2, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 200, 250, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900 or 2000, etc.

[0048] If the ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 is too small, the busbar and the pole 20 cannot be accurately positioned during welding; if the ratio of the port area of ​​the positioning hole 22 to the port area of ​​a single pit 21 is too large, the pole 20 and the tab 32 cannot be fixed during welding.

[0049] In one embodiment, the port area of ​​a single dimple 21 is 0.01 mm 2 -0.16mm 2 Not only can the pole 20 be reliably fixed, but also the port area of ​​a single pit 21 can be prevented from being too large, which would affect the structural strength of the pole 20 and be detrimental to the connection between the pole 20 and the busbar.

[0050] The port area of ​​a single pit 21 can be 0.01 mm 2 , 0.02mm 2 , 0.03mm 2 , 0.04mm 2 , 0.05mm 2 , 0.06mm 2 , 0.07mm 2 、0.08mm 2 、0.09mm 2 , 0.1mm 2 、0.11mm 2 , 0.12mm 2 , 0.13mm 2 , 0.14mm 2 , 0.15mm 2 or 0.16mm 2 etc.

[0051] In one embodiment, Figure 3 As shown, the pole lug 32 is welded to the pole post 20 to form a weld mark 33, and the orthographic projection of the weld mark 33 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 post 20, but also enables each position of the weld mark 33 formed between the pole lug 32 and the pole post 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 post 20.

[0052] The weld mark 33 forms an orthographic projection 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 overlap with the original figure.

[0053] In one embodiment, the weld mark 33 is a circular weld mark, that is, the outer contour of the weld mark 33 basically forms a circular structure. It can be further considered that after the outer contour of the weld mark 33 is outlined into a figure, the figure is basically circular. The circular weld mark can not only ensure the connection stability between the pole 20 and the pole ear 32, but also effectively control the welding quality of the pole ear 32 to avoid damage to the pole ear 32.

[0054] For example, the outer contour of the weld mark 33 may be a figure formed by connecting the outermost sides of a plurality of circles disposed at intervals.

[0055] In one embodiment, the weld mark 33 includes a plurality of circular weld marks, so that the circular weld marks can release stress and reduce the risk of tearing of the tab 32, thereby improving the current carrying capacity of the tab 32 and reducing the risk of short circuit between the tab 32 and other structures.

[0056] Among them, there are multiple circular weld marks, and the weld mark 33 can include multiple circular weld marks and multiple rectangular weld marks.

[0057] In one embodiment, the pole ear 32 is welded to the pole 20 to form a weld mark 33, and the ratio of the total port area of ​​the plurality of pits 21 to the total area of ​​the weld mark 33 is 0.3-23, so that during the welding process, the fixing ability of the pole 20 can be ensured according to the area of ​​the weld mark 33, thereby ensuring the welding fixing ability between the pole ear 32 and the pole 20.

[0058] The total port area of ​​the multiple pits 21 is the sum of the port areas of each pit 21, and the total area of ​​the weld mark 33 can be considered as: for example, the weld mark 33 includes multiple circular weld marks and multiple rectangular weld marks, and the total area enclosed by the circumferential outer edge of the weld mark 33 is the sum of the areas of the multiple circular weld marks and the areas of the multiple rectangular weld marks.

[0059] The ratio of the total port area of ​​the plurality of dimples 21 to the total area of ​​the weld mark 33 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 or 23, etc.

[0060] If the ratio of the total port area of ​​the plurality of pits 21 to the total area of ​​the weld mark 33 is too small, the pole 20 cannot be well fixed during the welding process; if the ratio of the total port area of ​​the plurality of pits 21 to the total area of ​​the weld mark 33 is too large, the current carrying capacity of the entire pole 20 will be affected, which is not conducive to ensuring the performance of the battery.

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

[0062] The pole lug 32 and the pole post 20 may be connected by torque welding.

[0063] In one embodiment, Figure 1 As shown, the battery housing 10 may include a cover plate 12 and a housing member 11, the cover plate 12 and the housing member 11 may be welded, two poles 20 may be provided on the cover plate 12, and the two poles 20 may be respectively connected to two pole ears 32. Both poles 20 may be provided with a plurality of pits 21, or one pole 20 may be provided with a plurality of pits 21, while the other pole 20 may not be provided with a pit 21.

[0064] Two pole tabs 32 may be provided on the battery cell body 31 , and the two pole tabs 32 are respectively connected to the two pole posts 20 . The two pole tabs 32 may be a positive pole tab and a negative pole tab, respectively, and the two pole posts 20 may be a positive pole post and a negative pole post, respectively.

[0065] One or more battery cells 30 may be disposed in the battery housing 10 , which is not limited herein.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0072] 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, and the pole 20 disposed on the battery housing 10 is electrically connected to the battery cell 30 disposed in the battery housing 10. The pole tab 32 on the battery cell body 31 is directly welded to the pole 20, thereby reducing the number of battery components used and improving the connection efficiency between the pole tab 32 and the pole 20. By providing a plurality of pits 21 at the end of the pole 20 away from the pole ear 32, when the pole ear 32 is directly welded to the pole 20, the plurality of pits 21 can form a reliable contact with the welding seat, thereby avoiding relative displacement of the pole 20 and affecting the welding quality of the pole ear 32 and the pole 20. The ratio of the depth of the pit 21 to the thickness of the pole ear 32 is 0.015-3. By adjusting the relationship between the depth of the pit 21 and the thickness of the pole ear 32, the stability of the pole 20 during the welding process can be effectively controlled, so that the welding of the pole ear 32 and the pole 20 is more stable, thereby ensuring a high-quality welding effect, thereby improving the safe use performance of the battery pack.

[0073] In one embodiment, the battery pack is a battery module or a battery pack.

[0074] 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.

[0075] 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.

[0076] An embodiment of the present invention also provides a welding device, please refer to Figure 4 The welding equipment is used to weld the above-mentioned battery, and the welding equipment includes: a welding head 40; a welding seat 50, and a plurality of protrusions 51 are arranged on the welding seat 50, and the plurality of protrusions 51 are adapted to the plurality of pits 21.

[0077] The welding equipment of one embodiment of the utility model includes a welding head 40 and a welding seat 50. In the process of welding the pole 20 and the battery cell 30, the pole 20 is pressed against the welding seat 50, and the welding head 40 can face the pole ear 32 on the battery body 31, thereby realizing direct welding connection between the pole ear 32 and the pole 20. By providing a plurality of convex points 51 on the welding seat 50, it can be ensured that the pole 20 and the welding seat 50 can have a relatively stable positional relationship, and the plurality of pits 21 provided at one end of the pole 20 away from the pole ear 32 can be matched with the plurality of convex points 51, thereby enhancing the contact ability between the pole 20 and the welding seat 50, avoiding relative displacement of the pole 20, thereby ensuring the welding efficiency between the pole ear 32 and the pole 20.

[0078] It should be noted that if Figure 4 As shown, a plurality of convex points 51 are provided on the welding seat 50. When the pole 20 is pressed on the welding seat 50, a plurality of pits 21 may be formed at one end of the pole 20 away from the pole lug 32, that is, the pits 21 may be squeezed out by the convex points 51 on the welding seat 50. Alternatively, before the pole 20 is pressed on the welding seat 50, a plurality of pits 21 may be processed at one end of the pole 20 away from the pole lug 32, and then the pole 20 is pressed on the welding seat 50, and at this time, the plurality of pits 21 may be matched with the plurality of convex points 51.

[0079] In one embodiment, a plurality of protrusions are provided on the welding head 40 , and the orthographic projections of the plurality of protrusions on the welding head 40 are centrally symmetrical figures, so that when the pole 20 and the pole lug 32 are welded, a centrally symmetrical weld mark 33 can be formed on the pole lug 32 .

[0080] The orthographic projections formed by the plurality of protrusions on the welding head 40 are centrally symmetrical figures, that is, the figure is rotated 180° around a certain point, and the rotated figure can overlap with the original figure. The orthographic projections of the plurality of protrusions on the welding head 40 are centrally symmetrical figures, for example, they can be centrally symmetrical figures formed by a plurality of circular protrusions, or they can be centrally symmetrical figures formed by a plurality of square protrusions, or they can be centrally symmetrical figures formed by a plurality of circular protrusions and a plurality of square protrusions.

[0081] In one embodiment, Figure 4 As shown, a plurality of first protrusions 41 and a plurality of second protrusions 42 are provided on the welding head 40, the orthographic projection of the first protrusion 41 on the welding head is a circle, and the orthographic projection of the second protrusion 42 on the welding head is a polygon; wherein the welding head 40 is an ultrasonic welding head, and when welding the pole lug 32 and the pole 20, the welding head 40 can be pressed onto the pole lug 32, thereby forming a welding mark on the pole lug 32 that matches the first protrusion 41 and the second protrusion 42, thereby ensuring the welding quality between the pole lug 32 and the pole 20.

[0082] In one embodiment, a plurality of first protrusions 41 are arranged around a plurality of second protrusions 42 , that is, a circular weld mark formed on the pole ear 32 can be arranged around a polygonal weld mark, thereby enabling the circular weld mark to release stress and effectively reduce the risk of the pole ear 32 tearing.

[0083] 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.

[0084] 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), and the pole lug (32) being directly welded to the pole (20); Wherein, a plurality of pits (21) are arranged at one end of the pole (20) away from the pole lug (32), and the ratio of the depth of the pits (21) to the thickness of the pole lug (32) is 0.015-3.

2. The battery according to claim 1, characterized in that The ratio of the depth of the pit (21) to the thickness of the tab (32) is 0.05-1.

3. The battery according to claim 1, characterized in that The ratio of the depth of the pit (21) to the height of the pole (20) is 0.005-0.

1.

4. The battery according to claim 1, characterized in that The depths of at least two of the recesses (21) are inconsistent.

5. The battery according to claim 4, characterized in that In a direction from the center of the pole (20) toward the circumferential outer edge of the pole (20), the depths of the plurality of pits (21) gradually decrease.

6. The battery according to claim 1, characterized in that A positioning hole (22) is provided at one end of the pole (20) away from the pole ear (32), and a plurality of the recesses (21) are arranged around the positioning hole (22); Wherein, the port area of ​​the positioning hole (22) is larger than the port area of ​​a single pit (21).

7. The battery according to claim 6, characterized in that The ratio of the port area of ​​the positioning hole (22) to the port area of ​​a single pit (21) is 1.2-2000.

8. The battery according to claim 1, characterized in that The port area of ​​a single pit (21) is 0.01 mm 2 -0.16mm 2 .

9. The battery according to any one of claims 1 to 8, characterized in that The pole ear (32) and the pole column (20) are welded to form a weld mark (33), and the orthographic projection of the weld mark (33) on the pole ear (32) is a centrally symmetrical figure.

10. The battery according to claim 9, characterized in that The welding mark (33) is a circular welding mark.

11. The battery according to claim 1, characterized in that The pole lug (32) and the pole column (20) are welded to form a weld mark (33), and the ratio of the total port area of ​​the plurality of recesses (21) to the total area of ​​the weld mark (33) is 0.3-23.

12. A welding device, characterized in that: Used for welding the battery according to any one of claims 1 to 11, the welding equipment comprising: Welding head; A welding seat is provided with a plurality of protrusions, and the plurality of protrusions are used to match the plurality of pits (21).

13. The welding device according to claim 12, characterized in that The welding head is provided with a plurality of protrusions, and the orthographic projections of the plurality of protrusions on the welding head are centrally symmetrical figures.

14. The welding device according to claim 12 or 13, characterized in that The welding head is provided with a plurality of first protrusions and a plurality of second protrusions, wherein the orthographic projection of the first protrusion on the welding head is a circle, and the orthographic projection of the second protrusion on the welding head is a polygon; Wherein, the welding head is an ultrasonic welding head.

15. The welding device according to claim 14, characterized in that The plurality of first protrusions are arranged around the plurality of second protrusions.

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