Battery, battery module, and electric device

Abstract

The present application discloses a battery, a battery module, and an electric device. The battery comprises a case, an end cover assembly, and an electrode assembly. The case has a first opening; the end cover assembly is connected to the case and covers the first opening; the electrode assembly is accommodated in the case. The electrode assembly comprises a main body portion, and a first tab and a second tab extending from the main body portion; the first tab and the second tab have the same polarity; the first tab and the second tab are welded to form a first welded portion; the first tab comprises a first end distant from the main body portion; the second tab comprises a second end distant from the main body portion; in the extension direction of the second tab, the first end extends beyond the second end; the part of the first tab extending beyond the second tab is welded to the end cover assembly to form a second welded portion. The present application is beneficial to reducing the risk of connection failure between electrode assemblies and end cover assemblies, thereby improving the reliability of batteries.

Description

Batteries, battery modules and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411444955.6, filed on October 16, 2024, entitled “Battery, Battery Module and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to a battery, a battery module, and an electrical device. Background Technology

[0004] Rechargeable batteries are batteries that can be recharged after being discharged to reactivate the active materials and continue to be used. Rechargeable batteries are widely used in electronic devices such as mobile phones, laptops, and drones.

[0005] In the development of battery technology, improving battery reliability has always been a research focus in the industry. Summary of the Invention

[0006] This application provides a battery, a battery module, and an electrical device that can improve the reliability of the battery.

[0007] In a first aspect, this application provides a battery, including a housing, an end cap assembly, and an electrode assembly. The housing has a first opening; the end cap assembly is connected to the housing and covers the first opening; the electrode assembly is housed within the housing. The electrode assembly includes a main body portion and a first electrode tab and a second electrode tab extending from the main body portion. The first electrode tab and the second electrode tab have the same polarity. The first electrode tab and the second electrode tab are welded to form a first weld portion. The first electrode tab includes a first end away from the main body portion, and the second electrode tab includes a second end away from the main body portion. Along the extending direction of the second electrode tab, the first end extends beyond the second end, and the portion of the first electrode tab extending beyond the second electrode tab is welded to the end cap assembly to form a second weld portion.

[0008] The formation of the first and second welded portions provides multiple conductive paths between the electrode assembly and the end cap assembly. Even if one of the first and second tabs breaks due to abnormal battery vibration or other reasons, the current from the electrode assembly can still be conducted to the end cap assembly through the other. This helps reduce the risk of connection failure between the electrode assembly and the end cap assembly, improving battery reliability. The first tab is welded separately to the end cap assembly, reducing the number of welding components and making it less prone to cold solder joints between the first tab and the end cap assembly. This further reduces the risk of connection failure between the electrode assembly and the end cap assembly, improving battery reliability.

[0009] In one or more of the above optional embodiments, the first weld portion and the second weld portion are separate. The formation of the second weld portion is less affected by the first weld portion, and the outer peripheral thickness of the second weld portion is relatively uniform, which is beneficial to improving the welding strength and welding effect of the second weld portion. Furthermore, the welding operation between the first electrode tab and the end cap assembly is less likely to interfere with the second electrode tab, and the influence of the second weld portion on the second electrode tab is also relatively small.

[0010] In one or more of the above optional embodiments, the first electrode tab includes a first stacked segment and a first bent segment, the first bent segment being bent from one end of the first stacked segment and connected to the main body; the second electrode tab includes a second stacked segment and a second bent segment, the second bent segment being bent from one end of the second stacked segment and connected to the main body; the first stacked segment includes a first portion and a second portion, the first portion and the second stacked segment are stacked and welded to form a first welded portion, the second portion extends beyond the second end along the extension direction of the second electrode tab and is welded to the end cap assembly to form a second welded portion. The first stacked segment and the second stacked segment are respectively the tail sections of the first electrode tab and the second electrode tab along their own extension directions. Welding the first portion and the second stacked segment to form the first welded portion is beneficial for controlling the length of the first stacked segment and the relative position of the first stacked segment and the shell, reducing the risk of the first stacked segment overlapping the shell due to excessive length; furthermore, the length of the second portion can be controlled within a suitable range, facilitating the formation of the second welded portion.

[0011] In one or more of the above optional embodiments, the second electrode tab is bent at the edge of the first welded portion to form a second bent segment. The first welded portion is relatively thick and has relatively high structural strength, which reduces the risk of the second bent segment breaking and plays a certain positioning role in the bending position of the second bent segment.

[0012] In one or more of the above optional embodiments, the first electrode tab is bent at the edge of the first welded portion to form a first bent segment. The first welded portion is relatively thick and has relatively high structural strength, which reduces the risk of the first bent segment breaking and plays a certain positioning role in the bending position of the first bent segment.

[0013] In one or more of the above optional embodiments, the battery further includes an insulating member that wraps around at least a portion of the first bent section and at least a portion of the second bent section. On the one hand, this can insulate at least a portion of the first and second bent sections from the main body, reducing the risk of short circuits. On the other hand, it can also provide a certain degree of restraint on the first and second bent sections, which is beneficial for bending, welding, etc. of the first and second tabs.

[0014] In one or more of the above optional embodiments, along the arrangement direction of the end cap assembly and the electrode assembly, the second laminated segment is located on the side of the first laminated segment facing away from the end cap assembly. This reduces the gap between the portion of the first laminated segment extending beyond the second laminated segment and the end cap assembly, improving the welding effect between the first laminated segment and the end cap assembly, and increasing the welding strength.

[0015] In one or more of the above optional embodiments, the end cap assembly includes an end cap, an explosion-proof sheet, and a perforated plate. The end cap is insulatedly connected to the housing and covers the first opening. The explosion-proof sheet is connected to the end cap, with at least a portion of the explosion-proof sheet located on the side of the end cap facing the electrode assembly. The perforated plate is located on the side of the explosion-proof sheet facing the electrode assembly. The perforated plate includes a substrate and a thinned portion. The substrate surrounds the thinned portion, and the thickness of the thinned portion is less than the thickness of the substrate. The thinned portion is connected to the explosion-proof sheet, and the substrate is welded to the first electrode tab to form a second welded portion. The thickness of the thinned portion is relatively thinner than the thickness of the substrate, resulting in relatively lower structural strength. The explosion-proof sheet is connected to the thinned portion, so when the internal gas pressure of the battery exceeds the upper limit that the explosion-proof sheet can withstand, the pulling effect of the thinned portion on the explosion-proof sheet is relatively small, which is beneficial for the explosion-proof sheet to flip and explode smoothly. Welding the first electrode tab to the thicker substrate is beneficial for improving the connection strength between the first electrode tab and the perforated plate, increasing the current carrying capacity, reducing heat generation, and improving the reliability of the battery.

[0016] In one or more of the above optional embodiments, along the arrangement direction of the end cap assembly and the electrode assembly, the projections of the first weld portion and the second weld portion are located on both sides of the projection of the thinned portion. With the first and second weld portions on both sides of the thinned portion, both the first and second tabs can have suitable extension lengths. This facilitates the rational selection of the dimensions of the first and second weld portions along the extension direction of the second tab, and also helps reduce the risk of short circuits caused by the first and second tabs overlapping the housing.

[0017] In one or more of the above optional embodiments, the first electrode tab and the second electrode tab are welded to form a third welded portion. At least a portion of the first welded portion is disposed along the outer periphery of the third welded portion and is directly connected to the third welded portion. The third welded portion can enhance the connection strength between the first electrode tab and the second electrode tab. In the first welded portion, the gap between the first electrode tab and the second electrode tab is compressed. The third welded portion is directly connected to the first welded portion, which helps to reduce the risk of incomplete welding in the third welded portion and further improves the welding effect and welding strength between the first electrode tab and the second electrode tab.

[0018] In one or more of the above optional embodiments, the first weld portion surrounds the third weld portion, and the outer periphery of the third weld portion is directly connected to the first weld portion. The structure of the first weld portion is more compact, the gap is smaller, and the outer periphery of the third weld portion and the first weld portion are less prone to breakage, which is beneficial to improving the flow capacity.

[0019] In one or more of the above optional embodiments, the first electrode and the second electrode are ultrasonically welded to form a first welded part, the first electrode and the second electrode are less affected by heat, and after welding, the parts of the first electrode and the second electrode near the first welded part are not easy to tear; the first electrode and the end cap assembly are laser welded to form a second welded part, which is beneficial to improving the welding strength of the first electrode and the end cap assembly; the first electrode and the second electrode are laser welded to form a third welded part, which is beneficial to strengthening the welding strength of the first electrode and the second electrode.

[0020] In one or more of the above optional embodiments, the dimension of the first weld portion along the extension direction of the second electrode tab is W2, and the dimension of the third weld portion along the extension direction of the second electrode tab is W1, where W2 > W1. The third weld portion does not easily extend beyond the first weld portion, and the two opposite edges of the third weld portion along the extension direction of the second electrode tab can be directly connected to the first weld portion, which is beneficial to improving the welding effect and welding strength of the third weld portion.

[0021] In one or more of the above optional embodiments, the dimension of the second welded portion along the extension direction of the second electrode tab is W3, and the dimension of the third welded portion along the extension direction of the second electrode tab is W1, where W3 > W1. This is beneficial for improving the welding strength of the second welded portion, enhancing the connection firmness between the first electrode tab and the end cap assembly, increasing the flow area of ​​the second welded portion, and improving the flow capacity.

[0022] In one or more of the above optional embodiments, the dimension of the third weld portion along the extension direction of the second electrode tab is W1, the dimension of the third weld portion along the width direction of the second electrode tab is L1, and the width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab; 0.5mm≥W1≥0.2mm, which is beneficial to improve the welding strength of the third weld portion, reduces the size requirements of the first weld portion, and improves welding efficiency; and / or, 6mm≥L1≥1mm, which can fully utilize the dimension in the width direction of the second electrode tab to improve the welding strength of the third weld portion, and also facilitates the first weld portion to surround the third weld portion, reducing the risk of incomplete welding of the third weld portion.

[0023] In one or more of the above optional embodiments, the dimension of the first welded part along the extension direction of the second electrode tab is W2, the dimension of the first welded part along the width direction of the second electrode tab is L2, and the width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab; 3mm≥W2≥1mm, which is beneficial to increase the area of ​​the first welded part and improve the weld strength of the first welded part, and can also reduce the size requirement of the second electrode tab along its extension direction, and can also improve the welding efficiency; and / or, 8mm≥L2≥2mm, which can fully utilize the size of the second electrode tab in the width direction to improve the weld strength of the first welded part, and can also reduce the size requirement of the second electrode tab in its own width direction, and can also improve the welding efficiency.

[0024] In one or more of the above optional embodiments, the dimension of the second welded part along the extension direction of the second electrode tab is W3, the dimension of the second welded part along the width direction of the second electrode tab is L3, and the width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab; 0.6mm≥W3≥0.3mm, which is beneficial to improve the welding strength of the second welded part, can reduce the length requirement of the part of the first electrode tab that extends beyond the second electrode tab, and can improve welding efficiency; and / or, 6mm≥L3≥1mm, which can make full use of the dimension in the width direction of the first electrode tab to improve the welding strength of the second welded part, can reduce the dimension requirement of the first electrode tab along its own width direction, and can improve welding efficiency.

[0025] In one or more of the above optional embodiments, along the extension direction of the second tab, the first end extends beyond the second end by a dimension d1, where 10mm ≥ d1 ≥ 3mm. This not only helps to increase the size of the second welded part and improve the weld strength of the second welded part, but also reduces the risk of short circuit caused by the first tab overlapping the housing or being inserted upside down into the main body. Furthermore, it can shorten the distance between the first welded part and the second welded part, thereby shortening the current flow path, reducing resistance, and improving the overcurrent capacity.

[0026] In one or more of the above optional embodiments, the distance between the first end and the second welding part along the extension direction of the second electrode tab is d2, 4mm≥d2≥2mm. This is beneficial for the welding operation between the first electrode tab and the end cap assembly, and the welding heat is less likely to act on the end cap assembly alone and have an adverse effect on it. In addition, it can shorten the length of the first electrode tab beyond the second welding part, reducing the risk of short circuit caused by the first electrode tab overlapping the shell or being inserted upside down into the main body.

[0027] In one or more of the above optional embodiments, the battery is a cylindrical battery.

[0028] In a second aspect, this application provides a battery module comprising a plurality of batteries provided according to any embodiment of the first aspect.

[0029] Thirdly, this application provides an electrical device that includes a battery module according to any embodiment of the second aspect. Attached Figure Description

[0030] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0031] Figure 1 is a schematic diagram of the structure of a battery provided in some embodiments of this application;

[0032] Figure 2 is a cross-sectional schematic diagram of the battery shown in Figure 1;

[0033] Figure 3 is a magnified structural diagram of region A in Figure 2;

[0034] Figure 4 is a magnified structural diagram of region B in Figure 3;

[0035] Figure 5 is a magnified structural diagram of region C in Figure 3;

[0036] Figure 6 is a partial structural schematic diagram of the first and second tabs of the battery provided in some embodiments of this application;

[0037] Figure 7 is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0038] Figure 8 is a structural block diagram of electrical equipment provided in some embodiments of this application.

[0039] The reference numerals in the accompanying drawings for the specific embodiments are as follows: Electrical equipment 1000; Battery module 100; Battery 1; Busbar 2; Bracket 3; Housing 10; First opening 11; Bottom wall 12; Side wall 13; End cap assembly 20; End cap 21; Explosion-proof sheet 22; Perforated plate 23; Second opening 231; Substrate 232; Thinned portion 233; Recess 234; Electrode assembly 30; Main body portion 31; First tab 32; First end 321; First laminated section 322; First part 3221; Second part 3222; First bent section 323; Second tab 33; Second end 331; Second laminated section 332; Second bent section 333; First welded part 40; Second welded part 50; Insulating member 60; Third welded part 70; Insulating washer 80; Extension direction X; Width direction Y. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0041] The terms "first," "second," "third," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0042] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0045] The battery, battery module, and electrical device of this application are described below with reference to the accompanying drawings.

[0046] Referring to Figures 1 to 8, this application provides a battery 1, which can be a lithium-ion battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or other types of batteries.

[0047] Battery 1 can be a square battery, a cylindrical battery, or other irregularly shaped battery. Optionally, battery 1 can be a cylindrical battery, for example, battery 1 can be a 21700 battery, 18650 battery, 46800 battery, 49480 battery, or other types of cylindrical batteries.

[0048] In some embodiments, battery 1 is a secondary battery. After being discharged, the active materials of the secondary battery can be reactivated by charging and reused.

[0049] The battery 1 provided in this embodiment includes a housing 10. The housing 10 has a first opening 11. When the battery 1 is a cylindrical battery, the first opening 11 may be located at one end of the battery 1 along its own axial direction.

[0050] In some embodiments, the battery 1 further includes an end cap assembly 20, which is connected to the housing 10 and covers the first opening 11.

[0051] The end cap assembly 20 is capable of closing the first opening 11, thereby forming a relatively enclosed receiving space between the housing 10 and the end cap assembly 20.

[0052] In some embodiments, the cylindrical battery 1 further includes an electrode assembly 30, which is housed within the housing 10.

[0053] In some embodiments, the electrode assembly 30 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery 1, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive and negative electrode.

[0054] In some embodiments, the electrode assembly 30 includes a separator disposed between the positive and negative electrode plates, which insulates the positive and negative electrode plates. The separator helps reduce the risk of short circuits between the positive and negative electrode plates while allowing active ions to pass through.

[0055] In some embodiments, the positive electrode includes a positive electrode body and a positive electrode tab, and the negative electrode includes a negative electrode body and a negative electrode tab. The positive electrode body includes a positive current collector and a layer of positively active material coated on the surface of the positive current collector, and the positive electrode tab is connected to the positive current collector. The negative electrode body includes a negative current collector and a layer of negatively active material coated on the surface of the negative current collector, and the negative electrode tab is connected to the negative current collector.

[0056] In some embodiments, the electrode assembly 30 includes a main body 31 and a first electrode tab 32 and a second electrode tab 33 extending from the main body 31, wherein the first electrode tab 32 and the second electrode tab 33 have the same polarity. For example, both the first electrode tab 32 and the second electrode tab 33 can be positive electrodes, or both can be negative electrodes.

[0057] The first tab 32 and the second tab 33 can both extend from one end of the main body 31 facing the end cap assembly 20.

[0058] The main body 31 may include a positive electrode body, a negative electrode body, and a separator. Optionally, the positive electrode body, the negative electrode body, and the separator are stacked and wound together.

[0059] In some embodiments, the electrode assembly 30 further includes a third tab (not shown), the polarity of which is opposite to that of the first tab 32 and the second tab 33. Optionally, both the first tab 32 and the second tab 33 can be positive tabs, and the third tab can be a negative tab.

[0060] The third electrode can be located on the side of the main body 31 facing away from the end cap assembly 20.

[0061] There can be one or more third electrodes.

[0062] In some embodiments, the first electrode tab 32 and the second electrode tab 33 are welded to form a first welded portion 40. The first electrode tab 32 includes a first end 321 away from the main body portion 31, and the second electrode tab 33 includes a second end 331 away from the main body portion 31. Along the extending direction of the second electrode tab 33, the first end 321 extends beyond the second end 331, and the portion of the first electrode tab 32 extending beyond the second electrode tab 33 is welded to the end cap assembly 20 to form a second welded portion 50.

[0063] Both the first electrode 32 and the second electrode 33 have one end directly connected to the main body 31 and the other end away from the main body 31. The other end of the first electrode 32 away from the main body 31 is the first end 321, and the other end of the second electrode 33 away from the main body 31 is the second end 331.

[0064] The extension direction of the second electrode 33 refers to the direction in which the second electrode 33 extends from the end connected to the main body 31 toward its second end 331. Correspondingly, the extension direction of the first electrode 32 is the direction in which the first electrode 32 extends from the end connected to the main body 31 toward its first end 321.

[0065] The extension direction of the first electrode 32 can be approximately the same as the extension direction of the second electrode 33. The portion of the first electrode 32 that does not extend beyond the second end 331 can approximately overlap with the second electrode 33. The first welding portion 40 can be formed by welding any part of the approximately overlapping first electrode 32 and second electrode 33.

[0066] Optionally, a portion of the first electrode tab 32 and at least a portion of the second electrode tab 33 are stacked together, and the overlapping portions of the first electrode tab 32 and the second electrode tab 33 are welded to form a first welded portion 40.

[0067] The first welded part 40 and the second welded part 50 can be formed by the same welding process or by different welding processes.

[0068] The first welding part 40 can be one or more. The second welding part 50 can be one or more.

[0069] In some examples, the first weld 40 and the second weld 50 can be directly connected. The current in the first tab 32 and the second tab 33 can both be conducted to the end cap assembly 20 through the first weld 40 and the second weld 50.

[0070] In other examples, the first weld portion 40 and the second weld portion 50 may also be disposed separately. The current of the first tab 32 and the second tab 33 may be conducted to the end cap assembly 20 through the first weld portion 40, the portion of the first tab 32 located between the first weld portion 40 and the second weld portion 50, and the second weld portion 50.

[0071] The first tab 32 and the second tab 33 can be connected to different positions of the current collector. For example, when the first tab 32 and the second tab 33 are positive tabs, the first tab 32 and the second tab 33 can be connected to one-third and two-thirds of the positive current collector along the winding direction, respectively.

[0072] The first tab 32 is welded to the end cap assembly 20. The current in the first tab 32 can be conducted to the end cap assembly 20 through the second welded part 50. The first welded part 40, formed by welding the first tab 32 and the second tab 33, is simultaneously connected to the first tab 32 and the second tab 33. The current in the second tab 33 can be conducted to the end cap assembly 20 through the first welded part 40, the first tab 32, and the second welded part 50. The fact that the current in both the first tab 32 and the second tab 33 can be conducted to the end cap assembly 20 helps to reduce the internal resistance of the battery 1, reduce heat generation, and improve the reliability of the battery 1.

[0073] The formation of the first weld portion 40 and the second weld portion 50 can provide multiple conductive paths between the electrode assembly 30 and the end cap assembly 20. Even if one of the first tab 32 and the second tab 33 breaks due to abnormal vibration of the battery 1 or other reasons, the current of the electrode assembly 30 can still be conducted to the end cap assembly 20 through the other, which helps to reduce the risk of connection failure between the electrode assembly 30 and the end cap assembly 20 and improves the reliability of the battery 1. For example, after the section of the first tab 32 located between the first weld portion 40 and the main body portion 31 breaks, the current of the electrode assembly 30 can be conducted to the end cap assembly 20 through the second tab 33, the first weld portion 40, the section of the first tab 32 located between the first weld portion 40 and the second weld portion 50, and the second weld portion 50.

[0074] The portion of the first tab 32 extending beyond the second tab 33 is welded to the end cap assembly 20, and the formation of the second welded portion 50 is independent of the second tab 33. The first tab 32 is welded separately to the end cap assembly 20, reducing the number of welding components. This reduces the likelihood of incomplete welds between the first tab 32 and the end cap assembly 20, thereby lowering the risk of connection failure between the electrode assembly 30 and the end cap assembly 20 and improving the reliability of the battery 1.

[0075] In some embodiments, the first welding portion 40 and the second welding portion 50 are separate.

[0076] Optionally, the first welding portion 40 and the second welding portion 50 are both spaced apart from the second end 331 of the second electrode 33. In the extending direction of the second electrode 33, the first welding portion 40 and the second welding portion 50 are respectively located on both sides of the second end 331.

[0077] The first welded part 40 is formed by welding the first electrode tab 32 and the second electrode tab 33, and the thickness of the first welded part 40 is greater than the thickness of the first electrode tab 32. If the first welded part 40 and the second welded part 50 are directly connected, the thickness of the edge where the second welded part 50 is connected to the first welded part 40 is larger, and the thickness of the edge where the second welded part 50 is not connected to the first welded part 40 is smaller. The uneven thickness of the outer periphery of the second welded part 50 can easily affect the welding strength and effect of the second welded part 50.

[0078] The first welded portion 40 and the second welded portion 50 are not directly connected, but are connected through a portion of the first electrode tab 32. The formation of the second welded portion 50 is not easily affected by the first welded portion 40, and the outer peripheral thickness of the second welded portion 50 is relatively uniform, which is beneficial to improving the welding strength and welding effect of the second welded portion 50. Furthermore, the welding operation between the first electrode tab 32 and the end cap assembly 20 is less likely to interfere with the second electrode tab 33, and the influence of the second welded portion 50 on the second electrode tab 33 is also relatively small.

[0079] In some embodiments, the first tab 32 includes a first stacked segment 322 and a first bent segment 323, wherein the first bent segment 323 is bent at one end of the first stacked segment 322 and connected to the main body 31.

[0080] The first end 321 of the first tab 32 is the end of the first stacked segment 322 that faces away from the first bent segment 323. The first bent segment 323 can be connected to the main body 31 by bending one or more times from one end of the first stacked segment 322.

[0081] In some embodiments, the second tab 33 includes a second stacked segment 332 and a second bent segment 333, wherein the second bent segment 333 is bent at one end of the second stacked segment 332 and connected to the main body 31.

[0082] The second end 331 of the second tab 33 is the end of the second stacked segment 332 that faces away from the second bent segment 333. The second bent segment 333 can be connected to the main body 31 by bending one or more times from one end of the second stacked segment 332.

[0083] The first stacked segment 322 includes a first portion 3221 and a second portion 3222, which are stacked together. At least a portion of the first bent segment 323 and at least a portion of the second bent segment 333 may be stacked or spaced apart.

[0084] In some embodiments, the first portion 3221 and the second stacked segment 332 are welded together to form a first welded portion 40, and the second portion 3222 extends beyond the second end 331 along the extending direction of the second tab 33 and is welded to the end cap assembly 20 to form a second welded portion 50.

[0085] In some examples, the first weld portion 40 may be adjacent to the second end 331 of the second tab 33 to shorten the length between the first weld portion 40 and the second end 331, and extend the length of the constrained section of the second tab 33, which helps to reduce the risk of short circuit caused by the second tab 33 being inserted backward into the main body portion 31.

[0086] In other examples, the first welded portion 40 may also be adjacent to the first bent segment 323 and / or the second bent segment 333. The first welded portion 40 has a relatively thick thickness and relatively high structural strength, which can guide the bending of the first bent segment 323 and / or the second bent segment 333, and play a certain positioning role in the bending position of the first bent segment 323 and / or the second bent segment 333.

[0087] In some other examples, the first weld 40 may be adjacent to both the second end 331 of the second tab 33 and the first bend 323 and / or the second bend 333.

[0088] The first stacked segment 322 and the second stacked segment 332 are the tail sections of the first tab 32 and the second tab 33 along their own extension direction, respectively. The first part 3221 of the first stacked segment 322 and the second stacked segment 332 are welded to form the first welded part 40, which helps to control the length of the first stacked segment 322 and the relative position of the first stacked segment 322 and the shell 10, reducing the risk that the first stacked segment 322 will overlap the shell 10 due to excessive length; in addition, the length of the second part 3222 can be controlled within a suitable range, which facilitates the formation of the second welded part 50.

[0089] In some embodiments, the second tab 33 is bent at the edge of the first welding portion 40 to form a second bent segment 333.

[0090] The first welded part 40 can be directly connected to the second bent section 333. The first welded part 40 is relatively thick and has relatively high structural strength, which helps to reduce the risk of the second bent section 333 breaking, and can also play a certain role in positioning the bending position of the second bent section 333.

[0091] In some embodiments, the first tab 32 is bent at the edge of the first welding portion 40 to form a first bent segment 323.

[0092] The first tab 32 and the second tab 33 can be bent at the same edge of the first welded part 40.

[0093] The first welded portion 40 can be directly connected to the first bent section 323. The first bent section 323 and the second bent section 333 can be directly connected to the same edge of the first welded portion 40.

[0094] The first welded part 40 is relatively thick and has relatively high structural strength, which helps to reduce the risk of the first bending segment 323 breaking. It can also play a certain role in positioning the bending position of the first bending segment 323.

[0095] In some embodiments, the battery 1 further includes an insulating member 60 that wraps at least a portion of the first bent segment 323 and at least a portion of the second bent segment 333.

[0096] The insulating element 60 may cover the entire first bent segment 323 and the second bent segment 333, or it may only cover a portion of the first bent segment 323 and the second bent segment 333.

[0097] Optionally, the first bending segment 323 and the second bending segment 333 are both bent at least twice to form at least two bending portions, wherein the section between two adjacent bending portions is relatively straight, and the insulating member 60 can wrap the section of the first bending segment 323 and the second bending segment 333 located between the two bending portions.

[0098] There may be one or more insulating elements 60. When there are multiple insulating elements 60, the multiple insulating elements 60 may be arranged at intervals along the extension direction of the second bending segment 333, so as to respectively wrap different sections of the whole formed by the first bending segment 323 and the second bending segment 333.

[0099] In some examples, the insulating element 60 can be insulating tape, and the insulating element 60 wraps the first bent section 323 and the second bent section 333 together. The first and last ends of the insulating element 60 along its winding direction can be overlapped and bonded.

[0100] In other examples, the insulating element 60 may also be a heat-shrinkable film, which shrinks and wraps tightly around the first bent segment 323 and the second bent segment 333 when heated.

[0101] The insulating component 60 wraps at least a portion of the first bent segment 323 and at least a portion of the second bent segment 333. On the one hand, it can insulate and isolate at least a portion of the first bent segment 323 and the second bent segment 333 from the main body 31, reducing the risk of short circuit. On the other hand, it can also exert a certain binding effect on the first bent segment 323 and the second bent segment 333, which is beneficial for bending, welding, etc. of the first electrode 32 and the second electrode 33.

[0102] In some embodiments, along the arrangement direction of the end cap assembly 20 and the electrode assembly 30, the second stacked segment 332 is located on the side of the first stacked segment 322 facing away from the end cap assembly 20.

[0103] The first stacked segment 322 is closer to the end cap assembly 20 than the second stacked segment 332.

[0104] At least a portion of the first laminate segment 322 can be attached to the end cap assembly 20 to reduce the gap between the first laminate segment 322 and the end cap assembly 20, which is beneficial for welding between the first laminate segment 322 and the end cap assembly 20 and reduces the risk of poor welding.

[0105] If the second stacked segment 332 is located on the side of the first stacked segment 322 facing the end cap assembly 20, the portion of the first stacked segment 322 that extends beyond the second stacked segment 332 needs to be bent toward the end cap assembly 20 before it can be welded to the end cap assembly 20. A large gap is easily formed between the first stacked segment 322 and the end cap assembly 20, affecting the welding effect. The edge of the second welded part 50 formed after welding is easily subjected to tensile force and cracks.

[0106] In this embodiment, the second stacked segment 332 is disposed on the side of the first stacked segment 322 facing away from the end cap assembly 20. This can reduce the gap between the portion of the first stacked segment 322 that extends beyond the second stacked segment 332 and the end cap assembly 20, thereby improving the welding effect between the first stacked segment 322 and the end cap assembly 20 and enhancing the welding strength.

[0107] In some embodiments, the end cap assembly 20 includes an end cap 21, a blast-proof plate 22, and a perforated plate 23. The end cap 21 is insulated from the housing 10 and covers the first opening 11. The blast-proof plate 22 is connected to the end cap 21, with at least a portion of the blast-proof plate 22 disposed on the side of the end cap 21 facing the electrode assembly 30, and the perforated plate 23 is disposed on the side of the blast-proof plate 22 facing the electrode assembly 30.

[0108] End cap 21 is connected to housing 10 and insulated from housing 10. Optionally, an insulating washer 80 may be provided between the periphery of end cap 21 and housing 10 to insulate and isolate end cap 21 and housing 10.

[0109] The housing 10 and end cap 21 can be made of steel, aluminum, composite metal, or other conductive materials. The housing 10 and end cap 21 can be made of the same or different materials.

[0110] The explosion-proof plate 22 can serve as a pressure relief mechanism for the battery 1. When the internal air pressure of the battery 1 exceeds the upper limit that the explosion-proof plate 22 can withstand, the internal air pressure of the battery 1 can cause the explosion-proof plate 22 to move away from the electrode assembly 30, flip and explode, thereby achieving the purpose of power cut-off and pressure relief. This helps to reduce the risk of the battery 1 exploding due to excessive internal air pressure and improves the safety performance of the battery 1.

[0111] The perforated plate 23 may be provided with a second opening 231, which penetrates the perforated plate 23 along its thickness direction. The gas inside the battery 1 can act on the explosion-proof sheet 22 through the second opening 231, so that the explosion-proof sheet 22 can be easily flipped and exploded.

[0112] In some embodiments, the perforated plate 23 includes a substrate 232 and a thinning portion 233. The substrate 232 is disposed around the thinning portion 233. The thickness of the thinning portion 233 is less than the thickness of the substrate 232. The thinning portion 233 is connected to the explosion-proof sheet 22. The substrate 232 is welded to the first tab 32 to form a second welding portion 50.

[0113] The current from the electrode assembly 30 can be conducted to the end cap 21 through the second welded part 50, the orifice plate 23, and the explosion-proof plate 22. The end cap 21 forms one of the electrode terminals of the battery 1 for electrical connection to an external structure (e.g., a busbar).

[0114] The substrate 232 can be directly connected to the thinned portion 233. The second opening 231 can be formed on the substrate 232.

[0115] The surface of the thinned portion 233 facing the explosion-proof sheet 22 can be flush with the surface of the substrate 232 facing the explosion-proof sheet 22. A recess 234 can be provided on the side of the perforated plate 23 facing the electrode assembly 30, and the recess 234 is correspondingly provided with the thinned portion 233.

[0116] The substrate 232 can be separated from the explosion-proof sheet 22, and a part of the main body 31 can also be connected to the explosion-proof sheet 22.

[0117] A portion of the explosion-proof disc 22 (e.g., the central area of ​​the explosion-proof disc 22) may protrude toward the perforated plate 23 from the other portions of the explosion-proof disc 22 and be connected to the thinning portion 233. An exhaust gap is formed between the other portions of the explosion-proof disc 22 and the perforated plate 23, which facilitates the uniform application of air pressure to the explosion-proof disc 22.

[0118] The explosion-proof sheet 22 and the thinning part 233 can be connected by welding, bonding or other suitable means.

[0119] The thickness of the thinned portion 233 is thinner than that of the substrate 232, resulting in relatively lower structural strength. The explosion-proof sheet 22 is connected to the thinned portion 233. When the gas pressure inside the battery 1 exceeds the upper limit that the explosion-proof sheet 22 can withstand, the pulling effect of the thinned portion 233 on the explosion-proof sheet 22 is relatively small, which is conducive to the smooth flipping and explosion of the explosion-proof sheet 22.

[0120] Welding the first tab 32 to the thicker substrate 232 helps to improve the connection strength between the first tab 32 and the perforated plate 23, increase the current carrying capacity, reduce heat generation, and improve the reliability of the battery 1.

[0121] In some embodiments, along the arrangement direction of the end cap assembly 20 and the electrode assembly 30, the projections of the first welding portion 40 and the second welding portion 50 are located on both sides of the projection of the thinning portion 233.

[0122] The projection of the first welding part 40 does not overlap with the projection of the thinning part 233, and the projection of the second welding part 50 does not overlap with the projection of the thinning part 233.

[0123] Optionally, along the extending direction of the second electrode 33, the second end 331 of the second electrode 33 is disposed separately from the thinning portion 233, and the portion of the first electrode 32 that extends beyond the second electrode 33 can cover the thinning portion 233 along the arrangement direction of the electrode assembly 30 and the end cap assembly 20, and the first end 321 of the first electrode 32 can extend beyond the thinning portion 233 along the extending direction of the first electrode 32.

[0124] If the projection of the first welded part 40 and the projection of the second welded part 50 are located on the same side of the projection of the thinning part 233, on the one hand, the extension length of the first electrode 32 and the second electrode 33 on that side of the thinning part 233 is relatively long, making it easy to overlap with the housing 10; on the other hand, the dimensions of the first welded part 40 and the second welded part 50 along the extension direction of the second electrode 33 are greatly restricted, which may affect the welding effect and welding strength.

[0125] In this embodiment, the projections of the first welding portion 40 and the second welding portion 50 are located on both sides of the projection of the thinning portion 233. The first welding portion 40 and the second welding portion 50 are on both sides of the thinning portion 233. The first electrode tab 32 and the second electrode tab 33 can both have suitable extension lengths, which is beneficial for rationally selecting the dimensions of the first welding portion 40 and the second welding portion 50 along the extension direction of the second electrode tab 33, and also helps to reduce the risk of short circuit caused by the first electrode tab 32 and the second electrode tab 33 overlapping the housing 10.

[0126] In some embodiments, the first tab 32 and the second tab 33 are welded to form a third weld portion 70, at least a portion of the first weld portion 40 is disposed along the outer periphery of the third weld portion 70 and is directly connected to the third weld portion 70.

[0127] The third welding part 70 can be one or more.

[0128] At least a portion of the edge of the third welding part 70 is directly connected to the first welding part 40, and a portion of the edge of the third welding part 70 may also be directly connected to the first tab 32 and the second tab 33.

[0129] During welding, the first electrode tab 32 and the second electrode tab 33 can be welded together to form a first weld mark. Then, a part of the first weld mark can be welded to form a third welded part 70. The part of the first weld mark that is not welded again to form the third welded part 70 forms the first welded part 40.

[0130] The third welding part 70 can strengthen the connection between the first electrode tab 32 and the second electrode tab 33. In the first welding part 40, the gap between the first electrode tab 32 and the second electrode tab 33 is compressed. The third welding part 70 is directly connected to the first welding part 40, which helps to reduce the risk of incomplete welding of the third welding part 70 and further improves the welding effect and welding strength between the first electrode tab 32 and the second electrode tab 33.

[0131] In some embodiments, the first welding portion 40 surrounds the third welding portion 70, and the outer periphery of the third welding portion 70 is directly connected to the first welding portion 40.

[0132] At least a portion of the first welded portion 40 surrounds the third welded portion 70 and is directly connected to the third welded portion 70. The structure of the first welded portion 40 is more compact and the gap is smaller, making it less likely for breakage to occur between the outer periphery of the third welded portion 70 and the first welded portion 40, which is beneficial for improving the flow capacity.

[0133] In some embodiments, the first electrode tab 32 and the second electrode tab 33 are ultrasonically welded to form a first welded portion 40. The first electrode tab 32 and the end cap assembly 20 are laser welded to form a second welded portion 50. The first electrode tab 32 and the second electrode tab 33 are laser welded to form a third welded portion 70.

[0134] During ultrasonic welding, the first tab 32 and the second tab 33 are less affected by heat. After welding, the portions of the first tab 32 and the second tab 33 near the first welded portion 40 are less prone to tearing.

[0135] Based on the first welded part 40, the first electrode 32 and the second electrode 33 are further laser welded to form a third welded part 70, which helps to strengthen the welding strength of the first electrode 32 and the second electrode 33.

[0136] The first electrode 32 is connected to the end cap assembly 20 by laser welding, which helps to improve the welding strength between the first electrode 32 and the end cap assembly 20.

[0137] In some embodiments, the dimension of the first welding portion 40 along the extension direction of the second electrode tab 33 is W2, and the dimension of the third welding portion 70 along the extension direction of the second electrode tab 33 is W1, where W2 > W1.

[0138] The third welded portion 70 may be generally rectangular. The dimension of the third welded portion 70 along the extension direction of the second tab 33 refers to the distance between the two opposite ends of the third welded portion 70 along the extension direction of the second tab 33.

[0139] The first welded portion 40 may be generally rectangular. The dimension of the first welded portion 40 along the extension direction of the second tab 33 refers to the distance between the two opposite ends of the first welded portion 40 along the extension direction of the second tab 33.

[0140] Along the extension direction of the second tab 33, the size W2 of the first welding part 40 is larger than the size W1 of the third welding part 70. The third welding part 70 is not likely to exceed the first welding part 40. The two opposite edges of the third welding part 70 along the extension direction of the second tab 33 can be directly connected to the first welding part 40, which is beneficial to improving the welding effect and welding strength of the third welding part 70.

[0141] The two opposite edges of the third welding part 70 along the width direction Y of the second electrode 33 can be directly connected to the first welding part 40 or separated from the first welding part 40. The width direction of the second electrode 33 is perpendicular to the extension direction of the second electrode 33.

[0142] In some embodiments, the dimension of the second welded portion 50 along the extending direction of the second electrode tab 33 is W3, where W3 > W1.

[0143] The second welded portion 50 may be generally rectangular. The dimension of the second welded portion 50 along the extension direction of the second tab 33 refers to the distance between the two opposite ends of the second welded portion 50 along the extension direction of the second tab 33.

[0144] The current in both the first tab 32 and the second tab 33 is conducted to the end cap assembly 20 through the second welded portion 50. The second welded portion 50 is made larger in dimension W3 along the extension direction of the second tab 33, which helps to improve the welding strength of the second welded portion 50, improve the connection between the first tab 32 and the end cap assembly 20, increase the current flow area of ​​the second welded portion 50, and improve the current flow capacity.

[0145] In some embodiments, referring to FIG6, the dimension of the third welding portion 70 along the extension direction X of the second electrode tab 33 is W1, 0.5mm≥W1≥0.2mm.

[0146] Optionally, W1 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, or any value between two of these values.

[0147] The dimension of the third welded part 70 along the extension direction X of the second electrode 33 is greater than or equal to 0.2 mm, which is beneficial to improving the welding firmness of the third welded part 70; the dimension of the third welded part 70 along the extension direction X of the second electrode 33 is less than or equal to 0.5 mm, which can reduce the size requirements of the first welded part 40 and improve the welding efficiency.

[0148] In some embodiments, referring to FIG6, the dimension of the third welding portion 70 along the width direction Y of the second electrode tab 33 is L1, the width direction Y of the second electrode tab 33 is perpendicular to the extension direction X of the second electrode tab 33, and 6mm≥L1≥1mm.

[0149] Optionally, L1 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm or any value between two of these values.

[0150] The dimension of the third welded part 70 along the width direction Y of the second electrode 33 is greater than or equal to 1 mm, which can make full use of the dimension of the second electrode 33 in the width direction to improve the welding firmness of the third welded part 70; the dimension of the third welded part 70 along the width direction Y of the second electrode 33 is less than or equal to 6 mm, and the two edges of the third welded part 70 can be spaced a certain distance from the two edges of the second electrode 33 in the width direction of the second electrode 33, which is beneficial for the first welded part 40 to surround the third welded part 70 and reduce the risk of poor welding of the third welded part 70.

[0151] In some embodiments, the width direction of the first electrode 32 is the same as the width direction Y of the second electrode 33. Along the width direction Y of the second electrode 33, the dimensions of the first electrode 32 and the second electrode 33 may be the same or different.

[0152] In some embodiments, the dimension of the first welded portion 40 along the extension direction X of the second electrode tab 33 is W2, where 3mm ≥ W2 ≥ 1mm.

[0153] The dimension W2 of the first welded part 40 along the extension direction X of the second electrode 33 is the distance between the two opposite ends of the first welded part 40 along the extension direction X of the second electrode 33.

[0154] Optionally, W2 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, or any value between two of these values.

[0155] Optionally, W2 > W1.

[0156] The dimension of the first welded part 40 along the extension direction X of the second electrode 33 is greater than or equal to 1 mm, which is beneficial to increase the area of ​​the first welded part 40 and improve the welding firmness of the first welded part 40; the dimension of the first welded part 40 along the extension direction X of the second electrode 33 is less than or equal to 3 mm, which can reduce the size requirements of the second electrode 33 along its extension direction and improve the welding efficiency.

[0157] In some embodiments, the dimension of the first welding portion 40 along the width direction Y of the second electrode tab 33 is L2, where 8mm ≥ L2 ≥ 2mm.

[0158] Optionally, L2 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, or any value between two of these values.

[0159] Optionally, L2 > L1.

[0160] The first welded part 40 has a dimension in the width direction Y of the second electrode 33 that is greater than or equal to 2 mm, which can make full use of the dimension in the width direction of the second electrode 33 to improve the welding firmness of the first welded part 40; the first welded part 40 has a dimension in the width direction Y of the second electrode 33 that is less than or equal to 8 mm, which helps to reduce the dimension requirements of the second electrode 33 in its own width direction and can improve welding efficiency.

[0161] In some embodiments, the dimension of the second welded portion 50 along the extension direction X of the second tab 33 is W3, 0.6mm≥W3≥0.3mm.

[0162] Optionally, W3 can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, or any value between two of these values.

[0163] The second weld portion 50 has a dimension greater than or equal to 0.3 mm along the extension direction X of the second electrode tab 33, which is beneficial to improving the welding firmness of the second weld portion 50; the second weld portion 50 has a dimension less than or equal to 0.6 mm along the extension direction X of the second electrode tab 33, which can reduce the length requirement of the portion of the first electrode tab 32 that extends beyond the second electrode tab 33 and improve welding efficiency.

[0164] In some embodiments, the dimension of the second welding portion 50 along the width direction Y of the second electrode tab 33 is L3, where 6mm ≥ L3 ≥ 1mm.

[0165] Optionally, L3 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm or any value between two of these values.

[0166] The second welded part 50 has a dimension in the width direction Y of the second electrode 33 that is greater than or equal to 1 mm, which can make full use of the dimension in the width direction of the first electrode 32 to improve the welding firmness of the second welded part 50; the second welded part 50 has a dimension in the width direction Y of the second electrode 33 that is less than or equal to 6 mm, which helps to reduce the dimension requirements of the first electrode 32 in its own width direction and can improve welding efficiency.

[0167] In some embodiments, along the extension direction X of the second tab 33, the first end 321 extends beyond the second end 331 by a dimension d1, where 10mm ≥ d1 ≥ 3mm.

[0168] Optionally, d1 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or any value between two of these values.

[0169] The first end 321 extends beyond the second end 331 by a dimension greater than or equal to 3 mm along the extension direction X of the second tab 33. The first tab 32 has a larger dimension and is welded to the end cap assembly 20 to form the second welded part 50, which is beneficial to increase the size of the second welded part 50 and improve the welding firmness of the second welded part 50. The first end 321 extends beyond the second end 331 by a dimension less than or equal to 10 mm along the extension direction X of the second tab 33, which can shorten the overall length of the first tab 32, reduce the risk of short circuit caused by the first tab 32 overlapping the housing 10 or being inserted upside down into the main body 31, and can also shorten the distance between the first welded part 40 and the second welded part 50, thereby shortening the current flow path, reducing resistance, and improving the overcurrent capacity.

[0170] In some embodiments, along the extending direction X of the second tab 33, the distance between the first end 321 and the second welding portion 50 is d2, where 4mm ≥ d2 ≥ 2mm.

[0171] Optionally, d2 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or any value between two of these values.

[0172] The distance between the first end 321 and the second welding part 50 is greater than or equal to 2mm, which is beneficial for the welding operation between the first electrode tab 32 and the end cap assembly 20, and the welding heat is not likely to act on the end cap assembly 20 alone and have an adverse effect on it; the distance between the first end 321 and the second welding part 50 is less than or equal to 4mm, which can shorten the length of the first electrode tab 32 that exceeds the second welding part 50, and reduce the risk of short circuit caused by the first electrode tab 32 overlapping the housing 10 or being inserted upside down into the main body 31.

[0173] In some embodiments, battery 1 is a cylindrical battery.

[0174] The casing 10 of the battery 1 includes a bottom wall 12 and a side wall 13. The bottom wall 12 and the end cap assembly 20 are arranged along the axial direction of the cylindrical battery. The bottom wall 12 is connected to the third tab, and the side wall 13 is insulated from and connected to the end cap assembly 20.

[0175] The bottom wall 12 is disposed opposite to the first opening 11 along the axial direction of the battery 1. The side wall 13 is connected to the bottom wall 12 and together with the bottom wall 12 forms a cylindrical space, which is open to the outside through the first opening 11. The bottom wall 12 and the side wall 13 can be integrally formed.

[0176] The bottom wall 12 and the end cap assembly 20 respectively form two electrode terminals of the battery 1, eliminating the need for traditional electrode terminals and simplifying the structure of the battery 1.

[0177] This application also provides a battery module 100, which includes a plurality of batteries 1 provided according to any embodiment of this application.

[0178] The battery module 100 provided in this application has the same technical effects as the battery 1 provided in any embodiment of this application, so it will not be described again here.

[0179] In some embodiments, the battery module 100 further includes a plurality of busbars 2 connected to the battery 1. The battery 1 can be connected in series or in parallel via the busbars 2.

[0180] In some embodiments, the battery module 100 further includes a support 3 having one or more receiving cavities in which a plurality of batteries 1 are disposed.

[0181] This application also provides an electrical device 1000, which includes a battery module 100 provided in any embodiment of this application. The battery module 100 can provide electrical energy for the operation of the electrical device 1000.

[0182] The electrical equipment used in this application embodiment can be portable devices, laptops, electric toys, drones, power tools, energy storage systems, etc. Power tools include metal cutting power tools, cleaning tools, etc., such as electric drills, electric wrenches, vacuum cleaners, robot vacuum cleaners, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical equipment.

[0183] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: The casing has a first opening; An end cap assembly is attached to the housing and covers the first opening; as well as Electrode assembly, housed within the housing; The electrode assembly includes a main body and a first electrode tab and a second electrode tab extending from the main body. The first electrode tab and the second electrode tab have the same polarity. The first electrode tab and the second electrode tab are welded to form a first welded portion. The first electrode tab includes a first end away from the main body, and the second electrode tab includes a second end away from the main body. Along the extending direction of the second electrode tab, the first end extends beyond the second end. The portion of the first electrode tab extending beyond the second electrode tab is welded to the end cap assembly to form a second welded portion.

2. The battery of claim 1, wherein, The first welded part and the second welded part are separate.

3. The battery according to claim 1 or 2, wherein, The first electrode includes a first stacked segment and a first bent segment, wherein the first bent segment is bent at one end of the first stacked segment and connected to the main body; The second electrode includes a second stacked segment and a second bent segment, wherein the second bent segment is bent at one end of the second stacked segment and connected to the main body; The first stacked segment includes a first part and a second part. The first part and the second stacked segment are stacked and welded to form the first welded part. The second part extends beyond the second end along the extension direction of the second tab and is welded to the end cap assembly to form the second welded part.

4. The battery of claim 3, wherein, The second electrode tab is bent at the edge of the first welded portion to form the second bent segment.

5. The battery of claim 4, wherein, The first electrode tab is bent at the edge of the first welded portion to form the first bent segment.

6. The battery of any one of claims 3-5, wherein, The battery also includes an insulating element that wraps around at least a portion of the first bent segment and at least a portion of the second bent segment.

7. The battery of any one of claims 3-6, wherein, Along the arrangement direction of the end cap assembly and the electrode assembly, the second stacked segment is located on the side of the first stacked segment opposite to the end cap assembly.

8. The battery of any one of claims 1-7, wherein, The end cap assembly includes an end cap, an explosion-proof plate, and a perforated plate. The end cap is insulatedly connected to the housing and covers the first opening. The explosion-proof plate is connected to the end cap. At least a portion of the explosion-proof plate is located on the side of the end cap facing the electrode assembly. The perforated plate is located on the side of the explosion-proof plate facing the electrode assembly. The perforated plate includes a substrate and a thinning portion. The substrate is disposed around the thinning portion, and the thickness of the thinning portion is less than the thickness of the substrate. The thinning portion is connected to the explosion-proof sheet, and the substrate is welded to the first electrode tab to form the second welded portion.

9. The battery of claim 8, wherein, Along the arrangement direction of the end cap assembly and the electrode assembly, the projections of the first welded portion and the second welded portion are located on both sides of the projection of the thinned portion.

10. The battery of any one of claims 1-9, wherein, The first electrode tab and the second electrode tab are welded to form a third welded part. At least a portion of the first welded part is disposed along the outer periphery of the third welded part and is directly connected to the third welded part.

11. The battery of claim 10, wherein, The first weld portion surrounds the third weld portion, and the outer periphery of the third weld portion is directly connected to the first weld portion.

12. The battery of claim 10 or 11, wherein, The first electrode tab and the second electrode tab are ultrasonically welded to form the first welded part, the first electrode tab and the end cap assembly are laser welded to form the second welded part, and the first electrode tab and the second electrode tab are laser welded to form the third welded part.

13. The battery of any one of claims 10-12, wherein, The dimension of the first welded portion along the extension direction of the second electrode tab is W2, and the dimension of the third welded portion along the extension direction of the second electrode tab is W1, where W2 > W1.

14. The battery of any one of claims 10-13, wherein, The dimension of the second welded portion along the extension direction of the second electrode tab is W3, and the dimension of the third welded portion along the extension direction of the second electrode tab is W1, where W3 > W1.

15. The battery of any one of claims 10-14, wherein, The dimension of the third welding part along the extension direction of the second electrode tab is W1, and the dimension of the third welding part along the width direction of the second electrode tab is L1. The width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab. 0.5mm ≥ W1 ≥ 0.2mm, and / or, 6mm ≥ L1 ≥ 1mm.

16. The battery according to any one of claims 1-15, wherein, The dimension of the first welded portion along the extension direction of the second electrode tab is W2, the dimension of the first welded portion along the width direction of the second electrode tab is L2, and the width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab; 3mm≥W2≥1mm, and / or, 8mm≥L2≥2mm; And / or, The second weld portion has a dimension of W3 along the extension direction of the second electrode tab, and a dimension of L3 along the width direction of the second electrode tab. The width direction of the second electrode tab is perpendicular to the extension direction of the second electrode tab. 0.6mm ≥ W3 ≥ 0.3mm, and / or, 6mm ≥ L3 ≥ 1mm.

17. The battery of any one of claims 1-16, wherein, Along the extension direction of the second electrode tab, the first end extends beyond the second end by a dimension d1, where 10mm ≥ d1 ≥ 3mm.

18. The battery of any one of claims 1-17, wherein, Along the extension direction of the second electrode tab, the distance between the first end and the second welding part is d2, 4mm≥d2≥2mm.

19. The battery of any one of claims 1-18, wherein, The battery is a cylindrical battery.

20. A battery module comprising a plurality of batteries according to any one of claims 1-19.

21. An electrical device comprising the battery module according to claim 20.

Images