Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises a shell and a collector plate, a mounting cavity is formed in the shell, the collector plate comprises an electrode connecting piece and a tab connecting piece, the electrode connecting piece is used for connecting an electrode of the battery, the tab connecting piece is used for connecting a tab of the battery, the electrode connecting piece wraps at least part of the tab connecting piece, and / or the tab connecting piece wraps at least part of the electrode connecting piece. According to the battery disclosed by the invention, the tab connecting piece is not easy to oxidize and corrode, the structural stability of the tab connecting piece is ensured, the electrical property of the tab connecting piece is prevented from being reduced, the electrode connecting piece is not easy to oxidize and corrode, the structural stability of the electrode connecting piece is ensured, and the electrical property of the electrode connecting piece is prevented from being reduced; and the structural stability of the collector plate is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to batteries and electrical equipment. Background Technology

[0002] Batteries are widely used in energy storage systems, transportation, and consumer electronics. The battery's tabs and electrodes need to be connected together via a current collector.

[0003] In related technologies, the connection stability between the current collector and the tab or electrode still needs to be improved. Utility Model Content

[0004] The embodiments of this application provide a battery and electrical device that can improve the technical problem of the connection stability between the current collector and the tab or electrode, which still needs to be improved.

[0005] In a first aspect, embodiments of this application provide a battery, comprising:

[0006] The housing has a mounting cavity.

[0007] A current collector includes an electrode connector and a tab connector, wherein the electrode connector is used to connect the electrodes of the battery, and the tab connector is used to connect the tabs of the battery;

[0008] Wherein, the electrode connector covers at least a portion of the tab connector, and / or, the tab connector covers at least a portion of the electrode connector.

[0009] In one embodiment, the side of the tab connector facing away from the tab is at least partially exposed within the mounting cavity, and / or, the side of the electrode connector facing away from the electrode is at least partially exposed within the mounting cavity.

[0010] In one embodiment, the exposed portion of the electrode connector and the electrode are connected by laser welding.

[0011] In one embodiment, along the axial direction of the housing, the welding connection position of the tab connector to the tab is projected onto the inner bottom wall of the housing, and the portion of the tab connector exposed in the mounting cavity on the side opposite to the tab is projected onto the inner bottom wall of the housing.

[0012] In one embodiment, the electrode connector includes a body and a boss, the boss being connected to the side of the body facing the electrode and protruding from the body, and the boss being connected to the electrode.

[0013] In one embodiment, the thickness of the body is t2, and the thickness of the boss is t3, wherein 0.5*t2≤t3≤1.5*t2.

[0014] In one embodiment, the electrode connector is wrapped around the side wall of the tab connector.

[0015] In one embodiment, the electrode connector includes a sidewall surface and a first surface and a second surface disposed opposite to each other. The first surface is located on the side of the electrode connector facing the electrode, and the second surface is located on the side of the electrode connector away from the electrode. The electrode connector covers at least a portion of the sidewall surface, wherein...

[0016] The electrode connector is wrapped around a portion of the first surface; and / or,

[0017] The electrode connector is wrapped around a portion of the second surface.

[0018] In one embodiment, a portion of the electrode connector protrudes from the side of the electrode connector facing the electrode.

[0019] In one embodiment, the electrode connector has a wrapping groove, and the electrode tab connector includes a first part and a second part connected in sequence, the first part being located in the wrapping groove, and the second part being exposed in the mounting cavity.

[0020] In one embodiment, the housing has a recessed portion that protrudes into the mounting cavity, and the electrode connector includes a first connecting segment and a second connecting segment. The first connecting segment connects the second connecting segment to the tab connector, and the second connecting segment connects to the recessed portion.

[0021] In one embodiment, along the axial direction of the housing, the electrode connector protrudes from the side of the electrode connector facing the electrode with a thickness of t0, and the thickness of the first connecting segment is t1, wherein 1≤t0 / t1≤5.

[0022] In one embodiment, the angle r at the connection between the first connecting segment and the second connecting segment is r1, where 0 < r1 ≤ t1.

[0023] In one embodiment, the thickness of the second connecting segment is h0, where t1≤h0<2mm.

[0024] In one embodiment, the thickness of the shell is h1, where 1 ≤ h0 / h1 ≤ 5.

[0025] In one embodiment, the second connecting segment is welded to the inner recess and the welding area is S4, and the total area of ​​the second connecting segment facing the housing is S5, wherein 0.01≤S4 / S5<0.8.

[0026] In one embodiment, the outer diameter of the second connecting segment is D2, the diameter of the tab connector is D1, and the diameter of the tab is D5, wherein D5≤D2≤5*D5, and / or 0.6*D2≤D1≤1.4*D2.

[0027] In one embodiment, the height of the tab along the axial direction of the housing is H2, where t0 ≤ 0.8 * H2 ≤ 5 mm.

[0028] In one embodiment, the electrode connector has a first groove, and at least a portion of the tab connector is located within the first groove; and / or,

[0029] The electrode connector has a second groove, and at least a portion of the electrode connector is located within the second groove.

[0030] In one embodiment, along the axial direction of the housing, the area of ​​the portion of the electrode connector exposed in the mounting cavity projected onto the inner bottom wall of the housing is S1, and the area of ​​the electrode connector projected onto the inner bottom wall of the housing is S2, wherein 0.05 ≤ S1 / S2 < 0.7.

[0031] In one embodiment, the electrode connector is welded to the electrode; wherein,

[0032] The solder area is S3, where 0.01*S1≤S3<0.8*S1; and / or,

[0033] A molten pool is formed at the welding connection point between the electrode connector and the electrode, and the depth of the molten pool along the axial direction of the housing is between 0.2 mm and 10 mm; and / or,

[0034] A molten pool is formed at the welding connection position between the electrode connector and the electrode, and the width of the molten pool is between 0.15 mm and 5 mm along the radial direction of the housing.

[0035] In one embodiment, the diameter of the tab connector is D1, and the diameter of the electrode connector is D2, wherein 0.5 ≤ D1 / D2 ≤ 1.

[0036] In one embodiment, the electrode connector and the tab connector are made of different materials.

[0037] In one embodiment, the electrode lead-out portion is made of the same material as the electrode of the battery; and / or, the tab connector is made of the same material as the tab.

[0038] In one embodiment, the electrode connector has an electrode lead-out portion connected to the electrode of the battery, and the tab connector has a tab connection portion connected to the tab;

[0039] The electrode lead-out portion is made of the same material as the electrode of the battery; and / or, the tab connection portion is made of the same material as the tab.

[0040] In one embodiment, the electrode connector is connected to the tab connector by electroplating.

[0041] In one embodiment, the battery further includes a top cover connected to the housing, the top cover having an injection hole, the collector having a through hole having a diameter of D3, and the injection hole having a diameter of D4, wherein D4≤D3≤10mm.

[0042] Secondly, embodiments of this application provide an electrical device including the battery described above.

[0043] The beneficial effects of the embodiments of this application are as follows:

[0044] In the embodiments of this application, at least part of the tab connector is wrapped by the electrode connector, so that the electrode connector can protect the tab connector, making the tab connector less susceptible to oxidation and corrosion, ensuring the structural stability of the tab connector, preventing the electrical performance of the tab connector from deteriorating, and improving the structural stability of the current collector.

[0045] By wrapping at least part of the electrode connector with the tab connector, the tab connector can protect the electrode connector, making it less susceptible to oxidation and corrosion, ensuring the structural stability of the electrode connector, preventing the degradation of the electrical performance of the electrode connector, and improving the structural stability of the current collector. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0048] Figure 2 This is a partial structural schematic diagram of the battery provided in an embodiment of this application;

[0049] Figure 3 This is provided by the embodiments of this application. Figure 2 Enlarged structural diagram at point A;

[0050] Figure 4 This is one of the structural schematic diagrams of the collector disk provided in the embodiments of this application;

[0051] Figure 5 This is a partial structural schematic diagram of the collector disk provided in an embodiment of this application;

[0052] Figure 6 This is provided by the embodiments of this application. Figure 5 Enlarged structural diagram at point B;

[0053] Figure 7 This is one of the cross-sectional views of the manifold provided in the embodiments of this application;

[0054] Figure 8 This is provided by the embodiments of this application. Figure 7 Enlarged schematic diagram of the structure at point C;

[0055] Figure 9 This is a second cross-sectional view of the manifold provided in an embodiment of this application;

[0056] Figure 10 This is provided by the embodiments of this application. Figure 9 Enlarged structural diagram at point D;

[0057] Figure 11 This is a second schematic diagram of the structure of the collector disk provided in the embodiments of this application;

[0058] Figure 12 This is the third schematic diagram of the structure of the collector plate provided in the embodiment of this application. The shaded area in the figure represents the exposed area of ​​the tab connector.

[0059] Figure 13 This is the fourth schematic diagram of the structure of the collector plate provided in the embodiment of this application. The shaded area in the figure represents the exposed area of ​​the tab connector.

[0060] Figure 14 This is the fifth schematic diagram of the structure of the collector plate provided in the embodiments of this application. The shaded area in the figure represents the exposed area of ​​the tab connector. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0062] The following is combined Figures 1 to 14 This application describes the battery and electrical device.

[0063] According to the embodiments of the first aspect of this application, see [link / reference]. Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 The battery includes a housing 1 and a current collector 2. The housing 1 has a mounting cavity 11. The current collector 2 includes an electrode connector 21 and a tab connector 22. The electrode connector 21 is used to connect the battery electrode 3, and the tab connector 22 is used to connect the tab 4.

[0064] The electrode connector 21 encloses at least a portion of the tab connector 22, and / or the tab connector 22 encloses at least a portion of the electrode connector 21.

[0065] According to the battery of the present application embodiment, at least part of the tab connector 22 is wrapped by the electrode connector 21, so that the electrode connector 21 can protect the tab connector 22, making the tab connector 22 less susceptible to oxidation and corrosion, ensuring the structural stability of the tab connector 22, preventing the electrical performance of the tab connector 22 from deteriorating, and improving the structural stability of the current collector.

[0066] By enclosing at least part of the electrode connector 21 with the tab connector 22, the tab connector 22 can protect the electrode connector 21, making it less susceptible to oxidation and corrosion, ensuring the structural stability of the electrode connector 21, preventing the electrical performance of the electrode connector 21 from deteriorating, and improving the structural stability of the current collector.

[0067] In some examples, the battery electrode 3 is, for example, the battery casing 1 or the battery terminal.

[0068] In some embodiments, the tab connector 22 has a tab connection portion 221 formed on the side facing the tab 4, such that the tab connection portion 221 is disposed opposite to the tab 4, which facilitates the connection between the tab connection portion 221 and the tab 4.

[0069] In some embodiments, the side of the tab connector 22 facing away from the tab 4 is at least partially exposed inside the mounting cavity 11.

[0070] Understandably, both the side of the tab connector 22 facing the tab 4 and the side of the tab connector 22 away from the tab 4 are at least partially exposed within the mounting cavity 11. Since the side of the tab connector 22 facing the tab 4 can be connected to the tab 4, and the side of the tab connector 22 away from the tab 4 is at least partially exposed within the mounting cavity 11, it facilitates laser welding or extrusion operations on the side of the tab connector 22 away from the tab 4, so that the side of the tab connector 22 facing the tab 4 is connected to the tab 4.

[0071] In some embodiments, the side of the electrode connector 21 facing away from the electrode 3 is at least partially exposed within the mounting cavity 11.

[0072] It is understandable that if the side of the electrode connector 21 facing away from the electrode 3 is exposed, it is convenient to perform laser welding or extrusion operations on the electrode connector 21 and the electrode from the side of the electrode connector 21 facing away from the electrode 3, so as to connect the electrode connector 21 and the electrode 3 together.

[0073] In some embodiments, the exposed portion of the tab connector 22 and the tab 4 are connected by laser welding to achieve a fixed connection between the tab connector 22 and the tab 4.

[0074] It is understandable that by laser welding the electrode connector 22 and the electrode 4 at the exposed part of the electrode connector 22, it is convenient to laser weld the electrode connector 22 and the electrode 4, and the impact on the electrode connector 21 can be reduced.

[0075] It should be noted that this is only an example of the connection method between the tab connector 22 and the tab 4. The tab connector 22 and the tab 4 can also be connected by snap-fit, interference fit, or other methods.

[0076] Specifically, along the axial direction of the housing 1, the orthographic projection of the welding connection position between the tab connector 22 and the tab 4 onto the inner bottom wall of the housing 1, and the portion of the tab connector 22 exposed in the mounting cavity 11 on the side facing away from the tab 4, are within the orthographic projection of the inner bottom wall of the housing 1. This ensures that when the tab connector 22 and the tab 4 are connected by laser welding, the welding laser will not act on the non-exposed part of the tab connector 22, that is, it ensures that the laser welding will not act on the electrode connector 21, effectively reducing the impact of laser welding on the electrode connector 21.

[0077] In some embodiments, see Figure 9 and Figure 10 The electrode connector 22 includes a body 222 and a boss 223. The boss 223 is connected to the side of the body 222 facing the electrode 4 and protrudes from the body 222. The boss 223 is connected to the electrode 4.

[0078] It is understandable that a boss 223 is formed at the connection position between the tab connector 22 and the tab 4, which can increase the thickness of the connection between the tab connector 22 and the tab 4 and ensure the structural strength of the connection between the tab connector 22 and the tab 4.

[0079] In some examples, when the tab connector 22 is connected to the tab 4 by laser welding, the boss 223 can increase the thickness of the position where the tab connector 22 is connected to the tab 4, that is, increase the thickness of the laser action area during laser welding, so as to prevent the laser from penetrating the tab 4.

[0080] Specifically, the thickness of the body 222 is t2, and the thickness of the boss 223 is t3, where 0.5*t2≤t3≤1.5*t2.

[0081] It is understandable that the thickness of the connection between the tab connector 22 and the tab 4 is t2+t3, that is, the thickness is between 1.5*t2 and 2.5*t2. This thickness range makes it easy to adjust the laser power according to the process and achieve stable welding.

[0082] For example, the thickness of the body 222 is between 0.05 mm and 0.5 mm.

[0083] In some embodiments, the electrode connector 22 includes a sidewall surface and a first surface and a second surface disposed opposite to each other. The first surface is located on the side of the electrode connector 22 facing the electrode 4, and the second surface is located on the side of the electrode connector 22 away from the electrode 4. The electrode connector 21 is wrapped around at least a portion of the sidewall surface.

[0084] Specifically, the electrode connector 21 is wrapped around a portion of the first surface; and / or, the electrode connector 21 is wrapped around a portion of the second surface.

[0085] It is understandable that the electrode connector 21 covers the side wall of the tab connector 22, meaning that the tab connector 22 will not protrude from the electrode connector 21 at this time, ensuring the degree of coverage of the tab connector 22 by the electrode connector 21 and ensuring the protective effect of the electrode connector 21 on the tab connector 22.

[0086] It is understandable that the electrode connector 21 wraps around part of the first surface of the tab connector 22. While increasing the degree of wrapping of the electrode connector 21 around the tab connector 22, it ensures that part of the tab connector 22 is still exposed on the side facing the tab 4, so that the tab connector 22 can be smoothly connected to the tab 4.

[0087] Electrode connector 21 is wrapped around part of the second surface of tab connector 22. While increasing the degree of wrapping of tab connector 21 around tab connector 22, it ensures that part of tab connector 22 is still exposed on the side away from tab 4, so as to facilitate laser welding of tab connector 22 and tab 4 from the side of tab connector 22 away from tab 4.

[0088] In some examples, the side of the tab connector 22 facing the tab 4 is flush with the side of the electrode connector facing the tab 4, so as to facilitate the connection between the tab connector 22 and the tab 4.

[0089] In some examples, the exposed area of ​​the tab connector 22 facing the tab 4 is made to be on the same horizontal plane as the side of the electrode connector 21 facing the tab 4 by stamping, so that the tab connector 22 contacts the tab 4.

[0090] Stamping creates a stamping step. The thickness of the electrode connector 21 between the tab connector 22 and the tab 4 is the same as the step height. The exposed area of ​​the tab connector 22 has a stamping angle r2, where 0 ≤ r2 ≤ 3 mm.

[0091] Optionally, the exposed material area B has a stamping draft angle α: 20°≤α≤70°.

[0092] In some embodiments, a portion of the tab connector 22 protrudes from the side of the electrode connector 21 facing the tab 4, and the protruding portion is used to connect with the tab 4, facilitating the connection between the tab connector 22 and the tab 4.

[0093] In some embodiments, the electrode connector 21 has a wrapping groove, and the tab connector 22 includes a first part 224 and a second part 225 connected in sequence, the first part 224 being located in the wrapping groove and the second part 225 being exposed in the mounting cavity.

[0094] Understandably, the enclosing groove of the electrode connector 21 can enclose the first part of the tab connector 22, reducing the exposed area of ​​the tab connector 22, making the tab connector 22 less susceptible to corrosion, and improving the structural stability of the tab connector 22. Meanwhile, the second part of the tab connector 22 is exposed inside the mounting cavity, facilitating laser welding connection between the tab connector 22 and the tab from the second part.

[0095] In some embodiments, see Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 The housing 1 has an inwardly recessed portion 12 that protrudes into the mounting cavity 11. The electrode connector 21 includes a first connecting section 212 and a second connecting section 213. The first connecting section 212 connects the second connecting section 213 to the tab connector 22, and the second connecting section 213 connects to the inwardly recessed portion 12.

[0096] It is understandable that the second connecting segment 213 is connected to the inner recess 12 of the housing 1, and the first connecting segment 212 is connected to the tab connector 22 to realize the connection between the housing 1 and the tab 4.

[0097] Specifically, along the axial direction of the housing 1, the electrode connector 22 protrudes from the electrode connector 21 on the side facing the electrode 4 with a thickness of t0, and the thickness of the first connecting section 212 is t1, where 1≤t0 / t1≤5.

[0098] Specifically, the angle r at the connection between the first connecting segment 212 and the second connecting segment 213 is r1, where 0 < r1 ≤ t1. The folded edge is protected from cracking during folding.

[0099] Understandably, during battery molding, the inward portion 12 of the casing 1 protrudes into the mounting cavity 11, and the first connecting segment 212 connects to the inward portion 12. Under the action of the inward portion 12, the second connecting segment 213 will bend relative to the first connecting segment 212. Setting the r-angle at the connection point of the first connecting segment 212 and the second connecting segment 213 to be greater than 0 and less than or equal to t1 can prevent cracking at the connection point of the second connecting segment 213 or the first connecting segment 212 and the second connecting segment 213 when bending.

[0100] Specifically, the thickness of the second connecting segment 213 is h0, where t1≤h0<2mm.

[0101] Understandably, setting the thickness of the second connecting segment 213 to be greater than or equal to the thickness of the first connecting segment 212 ensures that the thickness of the second connecting segment 213 is sufficient for welding the second connecting segment 213 and the recessed portion 12. Setting the thickness of the second connecting segment 213 to less than 2mm avoids the second connecting segment 213 being too thick and affecting the overall size of the battery.

[0102] Specifically, the thickness of shell 1 is h1, where 1≤h0 / h1≤5.

[0103] It is understandable that the second connecting segment 213 is welded to the shell 1. The ratio of the thickness of the second connecting segment 213 to the thickness of the shell 1 is greater than or equal to 1, which ensures the thickness of the second connecting segment 213 and avoids excessive impact on the shell 1 when welding the second connecting segment 213 to the shell 1.

[0104] The ratio of the thickness of the second connecting section 213 to the thickness of the shell 1 is less than or equal to 5, which avoids the shell 1 being too thin and prevents the shell 1 from cracking after welding with the second connecting section 213.

[0105] Specifically, the outer diameter of the second connecting section 213 is D2, and the inner diameter of the shell 1 is D6, where 0.8≤D2 / D6≤1.

[0106] Specifically, the second connecting section 213 is welded to the inner recess 12 with a welding area of ​​S4, and the total area of ​​the second connecting section 213 facing the housing 1 is S5, wherein 0.01≤S4 / S5<0.8, which ensures the welding area between the second connecting section 213 and the inner recess 12, thereby ensuring sufficient flow area between the electrode connector 21 and the inner recess 12, and ensuring the welding strength between the electrode connector 21 and the inner recess 12.

[0107] Specifically, along the axial direction of the housing 1, the height of the recessed portion 12 is between 0 mm and 8 mm.

[0108] Specifically, along the radial direction of the housing 1, the width of the recess 12 is between 0 mm and 10 mm.

[0109] Specifically, along the axial direction of the housing 1, the height of the tab 4 is H2, where t0 ≤ 0.8 * H2 ≤ 5 mm. It can be understood that t0 ≤ 0.8 * H2 ensures the height of the tab 4, facilitating the connection between the tab 4 and the tab connector 22; 0.8 * H2 ≤ 5 mm prevents the tab 4 from being too high, thus preventing it from having an excessive impact on the battery's size.

[0110] Specifically, the outer diameter of the second connecting section 213 is D2, the diameter of the tab connector 22 is D1, and the diameter of the tab 4 is D5, wherein D5≤D2≤5*D5, and / or 0.6*D2≤D1≤1.4*D2.

[0111] It is understandable that D5≤D2≤5*D5 ensures that the outer diameter of the second connecting section 213 is greater than or equal to the diameter of the tab 4, and the tab 4 will not protrude from the second connecting section 213, thereby avoiding direct contact between the tab 4 and the housing 1.

[0112] If 0.6*D2≤D1≤1.4*D2, it is easier to select the exposed area of ​​the tab connector 22, and easier to weld the tab connector 22 and the tab 4.

[0113] Specifically, along the axial direction of the housing 1, the height of the second connecting section 213 before it is connected to the inner portion 12 is between 0.2 mm and 50 mm.

[0114] Specifically, during assembly, the arc angle of the welding surfaces of the second connecting section 213 and the housing 1 must be consistent. The distance between the welding surfaces of the second connecting section 213 and the housing 1 should be between 0mm and 2mm. The overlapping surface of the second connecting section 213 and the current collector 2, relative to the recessed portion 12, can overlap or avoid the end face of the recessed portion 12. The battery includes a core, which has tabs 4. The width of the area without tabs 4 in the core is equal to (core diameter - width of the area with tabs 4) / 2. 70% ≤ Tab 4 area / Total core area ≤ 100%.

[0115] In some embodiments, the electrode connector 21 is formed with a first groove, and at least a portion of the tab connector 22 is located within the first groove.

[0116] Understandably, by placing at least a portion of the tab connector 22 within the first groove of the electrode connector 21, the electrode connector 21 can enclose at least a portion of the tab connector 22, thus protecting the tab connector 22. Simultaneously, placing the tab connector 22 within the first groove allows the first groove to limit the tab connector 22, improving the connection stability between the tab connector 22 and the electrode connector 21.

[0117] For example, the first groove can be formed by removing part of the electrode connector 21 through CNC machining; the first groove can be formed by removing part of the electrode connector 21 through laser ablation; the second groove can be formed by covering the part of the tab connector 22 that does not need the electrode connector 21 with paint or adhesive tape before electroplating or chemical plating, then plating the electrode connector 21 through electroplating / chemical plating, and finally ablation to remove the paint and peel off the adhesive tape to form the first groove and expose the tab connector 22.

[0118] In some examples, the first groove is a one-piece groove, which helps to reduce the number of welding operations.

[0119] In some examples, there are multiple first grooves, and the tab connector 22 has multiple exposed areas, which correspond one-to-one with multiple first grooves, which helps to increase the bonding strength.

[0120] In some embodiments, the tab connector 22 is formed with a second groove, and at least a portion of the electrode connector 21 is located within the second groove.

[0121] It is understandable that by placing at least a portion of the electrode connector 21 within the second groove of the tab connector 22, the tab connector 22 can enclose at least a portion of the electrode connector 21, thereby protecting the electrode connector 21. Simultaneously, placing the electrode connector 21 within the second groove allows the second groove to limit the electrode connector 21, improving the connection stability between the tab connector 22 and the electrode connector 21.

[0122] For example, the second groove can be formed by removing part of the tab connector 22 through CNC machining; the second groove can be formed by removing part of the tab connector 22 through laser ablation; the second groove can be formed by covering the part of the electrode connector 21 that does not need the tab connector 22 with paint or adhesive tape before electroplating or chemical plating, then plating the tab connector 22 by electroplating / chemical plating, and finally ablation to remove the paint and peel off the adhesive tape to form the second groove and expose the electrode connector 21.

[0123] In some embodiments, see Figure 12 , Figure 13 and Figure 14 Along the axial direction of the housing 1, the area of ​​the portion of the electrode connector 22 exposed in the mounting cavity 11 projected onto the inner bottom wall of the housing 1 is S1, and the area of ​​the electrode connector 21 projected onto the inner bottom wall of the housing 1 is S2, where 0 < S1 / S2 < 0.7.

[0124] It is understandable that 0 < S1 / S2 ensures that the tab connector 22 is at least partially exposed to facilitate the connection between the tab connector 22 and the tab 4; S1 / S2 < 0.7 avoids the exposed area from being too large, thus ensuring the structural strength of the collector plate 2.

[0125] In some embodiments, the tab connector 22 is welded to the tab 4.

[0126] Specifically, the solder area is S3, where 0.01*S1≤S3<0.8*S1.

[0127] It is understandable that the exposed area of ​​the tab connector 22 is welded to the tab 4 and has a weld area S3. 0.01*S1≤S3 ensures the weld area between the tab connector 22 and the tab 4, thus ensuring the effective connection between the tab connector 22 and the tab 4. S3<0.8*S1 avoids the weld area between the tab connector 22 and the tab 4 from being too large, thus avoiding excessive impact on the structure of the collector plate 2 and the tab 4.

[0128] For example, the welding trajectory shape between the electrode connector and the electrode can be any one of the following: S-shaped, V-shaped, tile-shaped, spiral-shaped, or circular.

[0129] In some embodiments, see Figure 2 and Figure 3 A molten pool 5 is formed at the welding connection position between the electrode connector 22 and the electrode 4.

[0130] Specifically, along the axial direction of the shell 1, the depth H1 of the molten pool 5 ranges from 0.2 mm to 10 mm.

[0131] Understandably, if the depth of the molten pool 5 is less than 0.2 mm, the connection stability between the tab connector 22 and the tab 4 is insufficient, and they are prone to detachment; if the depth of the molten pool 5 is greater than 10 mm, the tab 4 may melt through. Therefore, this application sets the depth of the molten pool 5 between 0.2 mm and 10 mm, so that the tab connector 22 and the tab 4 can withstand sufficient pull-out force after welding without detaching, thereby improving the connection strength between the tab connector 22 and the tab 4, while avoiding melting through the tab 4 and preventing any impact on the battery core.

[0132] Specifically, along the radial direction of the shell 1, the width W1 of the molten pool 5 is between 0.15 mm and 5 mm.

[0133] Understandably, if the width of the molten pool 5 is less than 0.15 mm, the current-passing area between the tab connector 22 and the tab 4 is too small, resulting in insufficient battery safety; if the width of the molten pool 5 is greater than 5 mm, the welding area is too large, increasing the difficulty of connecting the tab connector 22 and the tab 4. Therefore, this application sets the width of the molten pool 5 between 0.15 mm and 5 mm.

[0134] In some embodiments, the diameter of the tab connector 22 is D1, and the diameter of the electrode connector 21 is D2, wherein 0.5 ≤ D1 / D2 ≤ 1.

[0135] Understandably, setting the ratio of the diameter of the tab connector 22 to the diameter of the electrode connector 21 to be greater than or equal to 0.5 ensures the radial length of the tab connector 22, allowing for effective welding between the tab connector 22 and the tab 4. Setting the ratio of the diameter of the tab connector 22 to the diameter of the electrode connector 21 to be less than or equal to 1 prevents the tab connector 22 from protruding beyond the edge of the electrode connector 21, thus avoiding any impact on the connection between the electrode connector 21 and the housing 1, and also preventing direct contact between the tab connector 22 and the housing 1.

[0136] In some embodiments, the electrode connector 21 and the tab connector 22 are made of different materials.

[0137] It is understandable that the structural strength of the collector plate 2 is increased by combining the two materials.

[0138] In some embodiments, the electrode connector has an electrode lead-out portion 211 connected to the electrode of the battery, and the tab connector has a tab connection portion 221 connected to the tab.

[0139] The electrode lead-out part 211 is made of the same material as the electrode 3 of the battery.

[0140] It is understandable that the electrode lead-out part 211 and the electrode 3 are connected. By setting the material of the electrode lead-out part 211 and the electrode 3 to be the same, the potential difference corrosion caused by the different materials of the electrode lead-out part 211 and the electrode 3 can be avoided, thus ensuring the connection stability of the electrode lead-out part 211 and the electrode 3.

[0141] It is understandable that if the electrode lead-out part 211 and the electrode 3 are made of the same material, then the melting points of the electrode lead-out part 211 and the electrode 3 are close, and therefore the electrode lead-out part 211 or the electrode 3 is less likely to crack during welding when welding the electrode connector 21 and the electrode 3.

[0142] In some embodiments, the tab connection 221 is made of the same material as the tab 4.

[0143] It is understandable that when the tab connection 221 and the tab 4 are connected, setting the material of the tab connection 221 and the tab 4 to be the same can avoid the situation of potential difference corrosion caused by the different materials of the tab connection 221 and the tab 4, thus ensuring the connection stability of the tab connection 221 and the tab 4.

[0144] It is understandable that if the tab connection 221 and the tab 4 are made of the same material, then the melting points of the tab connection 221 and the tab 4 are close, and therefore the tab connection 22 or the tab 4 is less likely to crack during welding when the tab connection 221 and the tab 4 are welded together.

[0145] In some embodiments, the electrode connector 21 is connected to the tab connector 22 by electroplating to improve the connection stability between the electrode connector 21 and the tab connector 22.

[0146] In some embodiments, see Figure 1 and Figure 2 The battery also includes a top cover 6, which is connected to the housing 1. The top cover 6 has an injection hole 61, and the collector plate 2 has a through hole with a diameter of D3 and a diameter of D4. Wherein, D4≤D3≤10mm, ensuring that the electrolyte can flow into the through hole of the collector plate 2 and into the battery core pack.

[0147] In some examples, the battery forming process is roughly as follows: welding the negative current collector to the core tab → folding the negative current collector and welding it to the outer wall of the battery casing → assembling the negative electrode plastic → assembling the top cover plate → sealing the groove → assembling the sealing rubber and sealing sheet.

[0148] According to an embodiment of the second aspect of this application, the electrical device includes the battery described above.

[0149] According to the embodiments of this application, the electrical equipment uses an electrode connector 21 to wrap at least a portion of the tab connector 22, so that the electrode connector 21 can protect the tab connector 22, making the tab connector 22 less susceptible to oxidation and corrosion, ensuring the structural stability of the tab connector 22, preventing the electrical performance of the tab connector 22 from deteriorating, and improving the structural stability of the collector plate.

[0150] By enclosing at least part of the electrode connector 21 with the tab connector 22, the tab connector 22 can protect the electrode connector 21, making it less susceptible to oxidation and corrosion, ensuring the structural stability of the electrode connector 21, preventing the electrical performance of the electrode connector 21 from deteriorating, and improving the structural stability of the current collector.

[0151] It should be noted that electrical equipment can be vehicles, energy storage power sources, consumer electronics, medical devices, smart cities, aircraft, or household appliances. It is important to note that the above are merely illustrative examples of electrical equipment and do not impose any specific limitations on the types of equipment used.

[0152] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized by, The application relates to a battery shell. The shell is provided with a mounting cavity. The current collector plate comprises electrode connecting members and tab connecting members, the electrode connecting members are used for connecting electrodes of the battery, and the tab connecting members are used for connecting tabs of the battery. The electrode connecting members wrap at least part of the tab connecting members, and / or the tab connecting members wrap at least part of the electrode connecting members.

2. The battery of claim 1, wherein, The side of the tab connecting members, which is away from the tabs, is at least partially exposed in the mounting cavity, and / or the side of the electrode connecting members, which is away from the electrodes, is at least partially exposed in the mounting cavity.

3. The battery of claim 2, wherein, The exposed part of the tab connecting members and the tabs are connected by laser welding.

4. The battery of claim 3, wherein, Along the axial direction of the shell, the welding connection position of the tab connecting members and the tabs is in the projection of the inner bottom wall of the shell, and the part of the tab connecting members, which is exposed in the mounting cavity, is in the projection of the inner bottom wall of the shell.

5. The battery of claim 1, wherein, The tab connecting members comprise a body and a boss, the boss is connected to the side of the body, which is towards the tabs, and protrudes from the body, and the boss is connected to the tabs.

6. The battery of claim 5, wherein, The thickness of the body is t2, and the thickness of the boss is t3, wherein 0.5*t2<=t3<=1.5*t2.

7. The battery according to any one of claims 1 to 6, characterized in that, The electrode connecting members wrap the side wall surface of the tab connecting members.

8. The battery according to any one of claims 1 to 6, characterized in that The tab connecting members comprise a side wall surface and oppositely arranged first and second surfaces, the first surface is located on the side of the tab connecting members, which is towards the tabs, the second surface is located on the side of the tab connecting members, which is away from the tabs, and the electrode connecting members wrap at least part of the side wall surface, wherein The electrode connecting members wrap part of the first surface; and / or The electrode connecting members wrap part of the second surface.

9. The battery according to any one of claims 1 to 6, characterized in that, Part of the tab connecting members protrudes from the side of the electrode connecting members, which is towards the tabs.

10. The battery according to any one of claims 1 to 6, characterized in that, The electrode connecting members are provided with a wrapping groove, the tab connecting members comprise a first part and a second part which are connected in sequence, the first part is located in the wrapping groove, and the second part is exposed in the mounting cavity.

11. The battery according to any one of claims 1 to 6, characterized in that The shell is provided with a retracted part which protrudes into the mounting cavity, the electrode connecting members comprise a first connecting section and a second connecting section, the first connecting section connects the second connecting section and the tab connecting members, and the second connecting section is connected to the retracted part.

12. The battery of claim 11, wherein, Along the axial direction of the shell, the thickness of the tab connecting members, which protrudes from the side of the electrode connecting members, which is towards the tabs, is t0, and the thickness of the first connecting section is t1, wherein 1<=t0 / t1<=5.

13. The battery of claim 12, wherein, The r angle of the connection between the first connecting section and the second connecting section is r1, wherein 0 14. The battery of claim 12, wherein, The thickness of the second connecting section is h0, wherein t1<=h0<2mm.

15. The battery of claim 14, wherein, The thickness of the shell is h1, wherein 1<=h0 / h1<=5.

16. The battery of claim 11, wherein, The second connecting section is welded to the retracted part, and the welding area is S4, the total area of the side of the second connecting section, which is towards the shell, is S5, wherein 0.01<=S4 / S5<0.

8.

17. The battery of claim 11, wherein, An outer diameter of the second connecting section is D2, a diameter of the tab connecting member is D1, and a diameter of the tab is D5, wherein D5≤D2≤5*D5, and / or 0.6*D2≤D1≤1.4*D2.

18. The battery of claim 12, wherein, An axial height of the tab along the shell is H2, wherein t0≤0.8*H2≤5mm.

19. The battery of any one of claims 1 to 6, wherein, The electrode connecting member is formed with a first groove, and at least part of the tab connecting member is located in the first groove; and / or, The tab connecting member is formed with a second groove, and at least part of the electrode connecting member is located in the second groove.

20. The battery of any one of claims 1 to 6, wherein, A part of the tab connecting member exposed to the mounting cavity along the axial direction of the shell has a projection area S1 on the inner bottom wall of the shell, and a projection area of the electrode connecting member on the inner bottom wall of the shell is S2, wherein 0.05≤S1 / S2<0.

7.

21. The battery of claim 20, wherein, The tab connecting member is welded to the tab; wherein, A welding area of the tab connecting member to the tab is S3, wherein 0.01*S1≤S3<0.8*S1; and / or, A molten pool is formed at a welding position of the tab connecting member to the tab, and a depth of the molten pool along the axial direction of the shell is 0.2mm to 10mm; and / or, A molten pool is formed at a welding position of the tab connecting member to the tab, and a width of the molten pool along the radial direction of the shell is 0.15mm to 5mm.

22. The battery of any one of claims 1 to 6, wherein, A diameter of the tab connecting member is D1, and a diameter of the electrode connecting member is D2, wherein 0.5≤D1 / D2≤1.

23. The battery of any one of claims 1 to 6, wherein, The electrode connecting member and the tab connecting member are made of different materials.

24. The battery of any one of claims 1 to 6, wherein, The electrode connecting member has an electrode lead-out part connected to an electrode of the battery, and the tab connecting member has a tab connecting part connected to the tab; The electrode lead-out part is made of the same material as the electrode of the battery; and / or, the tab connecting part is made of the same material as the tab.

25. The battery of any one of claims 1 to 6, wherein, The electrode connecting member is connected to the tab connecting member by electroplating.

26. The battery of any one of claims 1 to 6, wherein, The battery further comprises a top cover connected to the shell, the top cover is formed with a liquid injection hole, the current collector plate is formed with a through hole, a diameter of the through hole is D3, and a diameter of the liquid injection hole is D4, wherein D4≤D3≤10mm.

27. An electrical device, comprising: The battery comprises the battery as claimed in any one of claims 1 to 26.

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