A battery, a battery assembly and an electric device

Abstract

The application discloses a battery, a battery assembly and an electric device. The battery comprises a shell, a pole core and a lead-out piece. The shell has a receiving cavity. The pole core has a tab. The pole core is accommodated in the shell. The lead-out piece is connected to the shell. The thickness of the tab ranges from 0.06 mm to 0.12 mm. The thickness of the lead-out piece and the thickness of the tab range from 0.11 mm to 1.62 mm. The lead-out piece and the tab are welded together. A molten pool is formed by the welding. The molten pool extends from the side of the lead-out piece away from the tab to the tab. A welding mark is formed on the surface of the side of the lead-out piece away from the tab. Thus, the pole core can be assembled into the shell first, and then welding operation is performed from the outside of the shell. The folding of the tab and the overturning of the pole core are avoided. The battery assembly process is optimized.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery, a battery assembly, and an electrical device. Background Technology

[0002] In existing technologies, the electrode tabs of the electrode core are first welded to the electrode post or the housing, and then the electrode core is flipped while the electrode tabs are folded and placed inside the housing. This assembly method is prone to damage to the electrode tabs or the electrode core during the flipping process. At the same time, it requires high welding technology between the electrode tabs and the electrode post or the housing, and the laser incident angle and space are easily limited. Utility Model Content

[0003] In order to solve at least one problem existing in the prior art, this application provides a battery, a battery assembly, and an electrical device.

[0004] In a first aspect, embodiments of this application provide a battery, comprising:

[0005] The shell has a receiving cavity;

[0006] The electrode core has tabs, and the thickness of the tabs is within the range of [0.06mm, 0.12mm];

[0007] The electrode core is housed within the receiving cavity;

[0008] A lead-out member is disposed on the housing and welded to the electrode tab to form a molten pool. The molten pool extends from the side of the lead-out member away from the electrode tab toward the electrode tab, and a solder mark is formed on the surface of the lead-out member away from the electrode tab.

[0009] The sum of the thickness of the lead-out element and the thickness of the electrode tab ranges from [0.11mm, 1.62mm].

[0010] In some embodiments, the electrode tab includes a first electrode tab, and the lead-out member includes a first lead-out member;

[0011] The housing has a first wall portion, and the first wall portion is provided with a first through hole extending along the thickness direction of the first wall portion;

[0012] The first lead-out element passes through the first through hole; the molten pool includes a first molten pool, which connects the first lead-out element and the first electrode tab.

[0013] The first molten pool extends from the side of the first lead away from the electrode core toward the first electrode tab, and a first solder mark is formed on the surface of the first lead away from the electrode core.

[0014] In some embodiments, the thickness of the first lead-out member is H1, the thickness of the first tab is H2, and the dimension of the first molten pool in the thickness direction of the first lead-out member is H3, where H1+0.25H2≤H3≤H1+0.75H2, and H1, H2, and H3 are measured in the same unit.

[0015] In some embodiments, the thickness of the first lead-out member is H1, where 0.1 mm ≤ H1 ≤ 1.5 mm.

[0016] In some embodiments, the first lead-out member includes a connecting portion and a protrusion, the protrusion protruding from one side of the connecting portion in the thickness direction, the connecting portion being disposed on the side of the first through hole away from the electrode core, and at least a portion of the protrusion passing through the first through hole so that the end of the protrusion away from the connecting portion is connected to the first electrode tab.

[0017] In some embodiments, the orthographic projection of the first molten pool is within the orthographic projection of the protrusion in the thickness direction of the first lead-out member.

[0018] In some embodiments, the connecting portion has a fixing portion surrounding the protrusion on the side near the housing, and the fixing portion is fixedly connected to the housing.

[0019] In some embodiments, the minimum size of the fixing part is greater than or equal to 1 mm in the direction from the circumferential edge of the first through hole toward the outer peripheral edge of the fixing part.

[0020] In some embodiments, a first insulating member is further included, at least a portion of which is disposed between the fixing portion and the first wall portion and is fixedly connected to the fixing portion and the first wall portion.

[0021] In some embodiments, at least a portion of the first insulating member is also disposed within the first through hole and surrounding the protrusion to insulate the protrusion from the first through hole.

[0022] In some embodiments, a second insulating member is further included, at least a portion of which is disposed within the first through hole and surrounds the outer periphery of the protrusion to insulate the protrusion from the housing.

[0023] In some embodiments, the connecting portion and the protrusion are integrally formed.

[0024] In some embodiments, the end of the protrusion away from the connecting portion protrudes from the first wall portion.

[0025] In some embodiments, the thickness of the connecting portion ranges from [0.2mm, 1.4mm], and / or the thickness of the protrusion ranges from [0.05mm, 0.3mm].

[0026] In some embodiments, the length of the first through hole along the first direction is greater than the width of the first through hole along the second direction; and / or

[0027] The length of the first lead-out member along the first direction is greater than the width of the first lead-out member along the second direction; and / or

[0028] The length of the first solder mark along the first direction is greater than the length of the first solder mark along the second direction;

[0029] The first direction is the width direction of the battery, and the second direction is the thickness direction of the battery.

[0030] In some embodiments, the tab includes a second tab; the lead-out includes a second lead-out, and the second lead-out is part of the housing;

[0031] The molten pool includes a second molten pool, which is connected to the second lead-out and the second electrode tab;

[0032] The second molten pool extends from the side of the second lead away from the electrode core toward the second electrode tab, and a second solder mark is formed on the surface of the second lead away from the electrode core.

[0033] In some embodiments, the thickness of the second lead-out is H4, the thickness of the second tab is H5, and the dimension of the second molten pool in the thickness direction of the second lead-out is H6.

[0034] H4+0.25H5≤H6≤H4+0.75H5, where H4, H5, and H6 are measured in the same unit.

[0035] In some embodiments, the thickness of the second lead-out member ranges from 0.05 mm to 0.3 mm.

[0036] In some embodiments, the length of the second solder mark along the first direction is greater than the length of the second solder mark along the second direction;

[0037] The first direction is the width direction of the battery, and the second direction is the thickness direction of the battery.

[0038] In some embodiments, the housing includes a first wall portion, the lead-out includes a first lead-out disposed on the first wall portion, and a second lead-out is a part of the first wall portion, the first lead-out and the second lead-out being insulated from each other.

[0039] In some embodiments, a third insulating element is also included, which is disposed between the electrode core and the lead-out element.

[0040] In some embodiments, the third insulating member has a through hole, and the electrode tab passes through the through hole and is connected to the lead-out member;

[0041] Along the thickness direction of the lead-out member, the orthographic projection of the through hole and the orthographic projection of the lead-out member are at least partially offset.

[0042] Thirdly, embodiments of this application provide a battery assembly, characterized in that it includes the battery described in this application, and a circuit structure, wherein the circuit structure is electrically connected to the battery.

[0043] Fourthly, embodiments of this application provide an electrical device, characterized in that it includes the battery described in this application, and / or the battery assembly described in this application.

[0044] The battery of this application includes a casing, an electrode core, and leads. The casing has a receiving cavity, the electrode core has tabs, and the thickness of the tabs ranges from [0.06 mm to 0.12 mm]. The electrode core is housed within the casing. The leads are connected to the casing, and the sum of the thickness of the leads and the thickness of the tabs ranges from [0.11 mm to 1.62 mm]. The leads and the tabs are welded together, forming a molten pool. The molten pool extends from the side of the leads away from the tabs towards the tabs, and a solder mark is formed on the surface of the leads away from the tabs. By limiting the sum of the thicknesses of the leads and the tabs to the range of [0.11 mm to 1.62 mm], the leads and tabs can be connected from the outside of the casing using welding. Simultaneously, limiting the thickness of the tabs to [0.06 mm to 0.12 mm] avoids the tabs being too thin and directly welding through, thus damaging the electrode core. It also ensures that the tabs can be bent well to fit the leads, thereby achieving the welded connection. The connection between the leads and the tabs is achieved by welding from the outside of the casing. The electrode core can be installed into the casing first, and then the welding operation is performed. This avoids the folding of the tabs and the flipping of the electrode core, thus optimizing the battery assembly process.

[0045] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0046] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0047] Figure 1 This is an exploded view of a battery according to certain embodiments of this application;

[0048] Figure 2 These are battery structure diagrams of certain embodiments of this application;

[0049] Figure 3 This is a side view of the battery according to certain embodiments of this application;

[0050] Figure 4 This is a partially enlarged cross-sectional view of the battery according to certain embodiments of this application;

[0051] Figure 5 This is a cross-sectional view of a battery according to certain embodiments of this application;

[0052] Figure 6 This is a partially enlarged cross-sectional view of the battery according to certain embodiments of this application;

[0053] Figure 7 This is a schematic diagram of the pole piece for some embodiments of this application;

[0054] Figure 8 This is a schematic diagram of the first molten pool according to certain embodiments of this application;

[0055] Figure 9 This is a schematic diagram of the second molten pool according to certain embodiments of this application;

[0056] Figure 10 This is a side view of the core of some embodiments of this application.

[0057] Explanation of key component symbols:

[0058] 1000 - Lead-out member; 1100 - First lead-out member; 1110 - Connecting part; 1111 - Fixing part; 1120 - Protrusion; 1200 - Second lead-out member;

[0059] 200 - Housing; 210 - First wall portion; 220 - Cover plate; 211 - First through hole;

[0060] 300 - First insulating component; 301 - Second through hole; 400 - Third insulating component;

[0061] 500 - Core; 501 - First tab; 502 - Second tab; 503 - Tab;

[0062] 600 - Second Insulator;

[0063] 700 - Molten pool; 701 - First molten pool; 702 - Second molten pool; 703 - First weld mark; 704 - Second weld mark; 705 - Weld mark. Detailed Implementation

[0064] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0065] In existing technologies, the electrode tabs of the electrode core are first welded to the electrode post or the housing, and then the electrode core is flipped while the electrode tabs are folded and placed inside the housing. This assembly method is prone to damage to the electrode tabs or the electrode core during the flipping process. At the same time, it requires high welding technology between the electrode tabs and the electrode post or the housing, and the laser incident angle and space are easily limited.

[0066] The battery of this application includes a casing 200, an electrode core 500, and a lead-out member 1000. The casing 200 has a receiving cavity, and the electrode core has a tab 503. The thickness of the tab 503 ranges from [0.06 mm to 0.12 mm], and the electrode core 200 is housed within the casing 200. The lead-out member 1000 is connected to the casing 200, and the sum of the thickness of the lead-out member 1000 and the thickness of the tab ranges from [0.11 mm to 1.62 mm]. The lead-out member 1000 and the tab 503 are welded together to form a molten pool 700. The molten pool 700 extends from the side of the lead-out member 1000 away from the tab toward the tab, and a solder mark is formed on the surface of the lead-out member 1000 away from the tab 503.

[0067] By limiting the overall thickness of the lead-out component 1000 and the tab 503 to the range of [0.11mm, 1.62mm], the lead-out component 1000 and the tab 503 can be connected by welding from the outside of the housing. Simultaneously, limiting the thickness of the tab 503 to [0.06mm, 0.12mm] avoids the tab 503 being too thin and directly welding through it, thus preventing damage to the electrode core 500. It also ensures that the tab 503 can be bent well to fit the lead-out component 1000, thereby achieving the welding connection. When the connection between the lead-out component 1000 and the tab 503 is achieved by welding from the outside of the housing 200, there are no restrictions on the laser incident angle and space during welding. The electrode core 500 can be installed into the housing first, and then the welding operation can be performed, avoiding the folding of the tab and the flipping of the electrode core 503, thus optimizing the battery assembly process.

[0068] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0069] In some embodiments, the housing 200 typically consists of a housing body and a cover plate 220.

[0070] In some embodiments, the shell body may be only a middle frame, while there are two cover plates 220, which respectively cover two openings in the middle frame to define the receiving cavity.

[0071] In some embodiments, reference Figure 1 The shell body may have only one opening, and the cover plate 220 may also have only one opening. The cover plate 220 covers the opening of the shell body to define the receiving cavity.

[0072] Both types of housings 200 described above can be used as embodiments of this application, and no specific limitations are imposed here.

[0073] The electrode core 500 of this application can be a stacked electrode core or a wound electrode core. Regardless of the form of the electrode core, the electrode tabs 503 of the electrode core 500 are usually located at both ends in the height direction of the electrode core 500 (i.e., the thickness direction of the lead-out member 1000). The electrode tabs 503 have at least two first electrode tabs 501 and second electrode tabs 502 with opposite polarities. The first electrode tabs 501 and second electrode tabs 502 can be provided at the same end of the electrode core 500 or at opposite ends.

[0074] Typically, in some embodiments, to facilitate the electrical connection between the battery and the protection board or BMS in the battery assembly, the first tab 501 and the second tab 502 are usually located at the same end of the electrode core 500, as shown in the reference. Figure 1 and Figure 5 The first tab 501 and the second tab 502 are both located at the same end of the core 500.

[0075] In order to extract the electrical energy from the core 500 to power the electrical equipment, two leads 1000 need to be provided on the battery casing 200 to connect the first tab 501 and the second tab 502 respectively. The part of the lead 1000 exposed outside the battery is electrically connected to the electrical equipment, thereby realizing the battery's power supply to the electrical equipment.

[0076] It should be noted that both leads 1000 can be poles; they can also be different parts of the housing 200 (as long as they are insulated from each other); of course, one can be a pole and the other can be part of the housing. All of these can enable the extraction of electrical energy from the core 500, and the welding method of this application can also simplify the assembly process.

[0077] In some embodiments, reference Figures 1-3 ,as well as Figure 5 The lead-out component 1000 includes a first lead-out component 1100 and a second lead-out component 1200. The first lead-out component 1100 is a terminal post, and the second lead-out component 1200 is part of the housing 200. Both the first lead-out component 1100 and the second lead-out component 1200 are disposed on the same wall of the housing 200. This facilitates quick soldering of the first lead-out component 1100 and the second lead-out component 1200 with soldering tools, or it facilitates electrical connection between the battery and external circuitry. External circuitry may include a protection board, a BMS, or power supply settings.

[0078] It should be noted that this wall portion is a wall portion of the shell body.

[0079] It should be noted that the lead 1000 of this application may only include the two first leads 1100 of this application, that is, both leads are terminals, which is applicable to cells whose casings are not charged. The lead 1000 of this application may also only include the two second leads 1200, which is also applicable when the casing of the metal battery is composed of two mutually insulated sub-casings.

[0080] In some embodiments, the first lead-out 1100 and the second lead-out 1200 do not necessarily need to be on the same wall. This needs to be determined according to the battery specifications and the corresponding protection board or BMS, which will not be elaborated here.

[0081] In some embodiments, the aforementioned wall portion can be considered as Figure 1 The first wall portion 210 shown is a side wall of the shell body.

[0082] When the first lead-out member 1100 is a pole post, the first wall portion 210 is provided with a first through hole 211 that penetrates the first wall portion 210 along the thickness direction of the first wall portion 210, so that the first lead-out member 1100 can pass through and be electrically connected to the first pole tab 501.

[0083] It should be noted that the first wall portion 210 can be a side wall of the housing 200 or other wall portions, and no specific restrictions are made here.

[0084] The first lead-out 1100 is disposed in the first through hole 211; the molten pool 700 includes a first molten pool 701, which connects the first lead-out 1100 and the first tab 501; the first molten pool 701 extends from the side of the first lead-out 1100 away from the core 500 toward the first tab 501, and a first solder mark 703 is formed on the surface of the first lead-out 1100 away from the core 500.

[0085] The welding tool performs welding from the outside of the housing 200. The laser enters the first lead 1100 from the side of the first lead 1100 exposed outside the housing 200, thereby welding the first lead 1100 and the first tab 501 and forming a first molten pool 701. At the same time, a first solder mark 703 is formed on the side of the first lead 1100 exposed outside the housing 200.

[0086] It should be noted that the thickness of the tab 503 in this application needs to meet the requirements of [0.06mm, 0.12mm]. If the thickness of the tab 503 is less than 0.06mm, the existing welding process will weld through the tab 503. If the thickness of the tab 503 is greater than 0.12mm, the tab 503 cannot be bent well. In this case, the surface of the tab 503 in the thickness direction cannot fit well with the lead-out part 1000, resulting in a poor weld.

[0087] For bending of the tab 503, please refer to... Figure 1 and Figure 10 One end of the tab 503 is connected to the core 500, and the other end extends away from the core 500. When the thickness direction of the lead-out piece 1000 is not parallel to the thickness direction of the tab 503, the tab 503 needs to be bent so that the thickness direction of the tab 503 used for welding with the lead-out piece 1000 is consistent with the thickness direction of the lead-out piece 1000, so as to facilitate welding connection.

[0088] Therefore, the tabs 503 of this application, including the first tab 501 and the second tab 502, need to meet this thickness range.

[0089] It should be emphasized that, in some embodiments, the tab 503 of the electrode core 500 is composed of multiple sub-tabs welded together (these sub-tabs may at least partially connect to different electrode plates). The overall thickness of such tab 503 is not uniform, with a thicker portion near the electrode core and a thinner portion where multiple sub-tabs are welded together. In this case, the thickness of the tab 503 in this application specifically refers to the thickness of the portion of the tab 503 used for welding to the lead-out member 1000.

[0090] It should also be emphasized that, in some embodiments, the tab 503 of the core 500 is an adapter (or adapter piece) that connects multiple sub-tabs. In this case, the thickness of the tab 503 refers to the thickness of the part of the adapter (or adapter piece) used for welding with the lead-out piece 1000.

[0091] Based on the thickness of the tab 503 meeting the above-mentioned range, in order for the welding tool to successfully weld the lead 1000 and the tab 503 together from the outside of the housing 200, the thickness of the lead 1000 needs to be limited. If the lead 1000 is too thick, even if the welding tool can form a molten pool 700 connecting the lead 1000 and the tab 503, this molten pool 700 will be unstable, resulting in low reliability of the connection between the lead 1000 and the tab 503. If the lead 1000 is too thin, it may result in low reliability of the electrical connection between the lead 1000 and the external circuit, or insufficient current carrying capacity of the lead 1000, or insufficient rigidity of the lead 1000, which will also cause reliability problems in the battery.

[0092] Therefore, this application limits the sum of the thickness of the lead-out piece 1000 and the thickness of the tab 503 to a range of [0.11 mm, 1.62 mm]. This ensures both the stable connection between the molten pool 700 and the lead-out piece 1000 and the tab 503, and also guarantees the reliable performance of the lead-out piece 1000 as a power extraction component of the core 500.

[0093] In some embodiments, reference Figure 8 The thickness of the first lead-out element (1100) is H1, the thickness of the first electrode 501 is H2, and the dimension of the first molten pool 701 in the thickness direction of the first lead-out element 1100 is H3. H1+0.25H2≤H3≤H1+0.75H2, and H1, H2, and H3 are measured in the same unit.

[0094] During the welding process, the first tab 501 must not be welded through. If it is, the welding laser will damage the electrode core 500. Therefore, H3 ≤ H1 + 0.75H2. However, the depth of the first molten pool 701 in the first tab 501 cannot be too shallow. If it is too shallow, the connection between the first tab 501 and the first lead 1100 will not be strong enough, reducing the reliability of the battery. Therefore, H1 + 0.25H2 ≤ H3.

[0095] In some embodiments, the thickness of the first lead-out 1100 is H1, where 0.1 mm ≤ H1 ≤ 1.5 mm.

[0096] If the thickness of the first lead-out part 1100 is greater than 1.5mm, the welding effect will be poor, the depth of the first molten pool 701 on the first electrode 501 will be too shallow, and the connection reliability between the first lead-out part 1100 and the first electrode 501 will not be high.

[0097] Meanwhile, given that the first lead-out 1100 needs to be inserted through the first through hole 211 and welded to the first tab 501, and that the first lead-out 1100 needs to have sufficient current carrying capacity to meet the performance requirements of the battery, if the first lead-out 1100 is less than 0.1mm, then the function and reliability of the first lead-out 1100 cannot be met.

[0098] In some embodiments, reference Figure 7 The first lead-out member 1100 includes a connecting portion 1110 and a protrusion 1120. The protrusion 1120 protrudes from one side of the connecting portion 1110 in the thickness direction. The connecting portion 1110 is located on the side of the first through hole 211 away from the pole core 500. At least a portion of the protrusion 1120 passes through the first through hole 211 so that the end of the protrusion 1120 away from the connecting portion 1110 is connected to the first pole tab (501).

[0099] The connecting part 1110 can limit and fix the first lead 1100 relative to the first wall part 210, preventing the first lead from being completely embedded in the first through hole 211. The protrusion 1120 passes through the first through hole 211 and can be electrically connected to the first electrode 501.

[0100] It should be noted that in some embodiments, the first lead-out member 1100 can be fixedly connected to the housing 200 by its fixed connection with the first through hole 211. In this case, the first lead-out member 1100 may not have a connecting part 1110. This also applies to this application, that is, the first lead-out member 1100 and the first tab 501 are welded from the outside of the housing 200, which optimizes the battery assembly process of this application.

[0101] In some embodiments, in the thickness direction of the first lead-out 1100, the orthographic projection of the first molten pool 701 lies within the orthographic projection of the protrusion 1120.

[0102] The first molten pool 701 extends from the connecting portion 1120 to the protrusion 1120, and from the end of the protrusion 1120 away from the connecting portion 1120 to the first tab 501. If the orthographic projection of the first molten pool 701 exceeds the orthographic projection of the protrusion 1120, it will affect the fixed connection between the first lead 1100 and the housing 200, affecting the sealing performance, and may even lead to a short circuit, thus posing a safety hazard to the battery. Therefore, the orthographic projection of the first molten pool 701 is within the orthographic projection of the protrusion 1120, that is, the first molten pool 701 will not be welded to the housing 200, ensuring the safety performance of the battery.

[0103] In some embodiments, the connecting portion 1110 has a fixing portion 1111 surrounding the protrusion 1120 on the side near the housing 200, and the fixing portion 1111 is fixedly connected to the housing 200.

[0104] The connecting part 1110 not only provides electrical connection between the first lead-out 1100 and the external circuit, but also is fixedly connected to the housing 200 to secure the first lead-out 1100. (Reference) Figure 7 The fixing part 1111 is at least a portion of the surface of the connecting part 1110 on the side near the protrusion 1120. The fixing part 1111 is arranged around the protrusion 1120, that is, the fixing part 1111 is fixedly connected in the circumferential direction of the protrusion 1120, which can improve the sealing performance between the first lead-out member 1100 and the housing 200.

[0105] Furthermore, in the direction from the circumferential edge of the first through hole 211 toward the outer peripheral edge of the fixing part 1111, the minimum dimension of the fixing part 1111 is greater than or equal to 1 mm.

[0106] Although the fixing part 1111 is wrapped around the protrusion 1120, if the width of the fixing part 1111 is less than 1mm, the fixing part 1111 with a width of less than 1mm may have an unstable connection due to the small connection area with the housing 200, that is, the reliability is not high. Even if the fixed connection is successfully achieved, the weak connection relationship will be damaged during the use of the battery, which will lead to the destruction of the sealing environment between the first lead 1100 and the housing 200, thus causing safety hazards to the battery.

[0107] In some embodiments, reference Figure 1 , Figure 4 ,as well as Figure 6 The battery also includes a first insulating member 300, at least a portion of which is disposed between the fixing part 1111 and the first wall part 210 and is fixedly connected to the fixing part 1111 and the first wall part 210.

[0108] When the housing 200 is energized, the connecting part 1110 and the housing 200 cannot be fixedly connected by welding or other means. This would cause the first lead 1100 with opposite polarity to be electrically connected to the housing 200, resulting in a short circuit. At this time, the first insulating member 300 is provided between the connecting part 1110 and the housing 200. This not only achieves a fixed connection between the first lead 1100 and the housing 200, but also keeps the first lead 1100 and the housing 200 insulated.

[0109] For example, the first insulating element 300 can be an insulating adhesive, which is sticky on both sides and can simultaneously achieve the fixed connection and insulation between the first lead-out element 1100 and the housing 200.

[0110] It should be noted that the first insulating member 300 is disposed between the mounting part 1111 and the housing 200, which means that the first insulating member 300 needs to be adapted to the size of the mounting part 1111. That is, the first insulating member 300 has a second through hole 301 to avoid the protrusion 1120.

[0111] Furthermore, in order to make the connection between the mounting part 1111 and the housing 200 more reliable, the outer peripheral edge of the first insulating member 300 can be appropriately extended to the outer peripheral side of the mounting part 1111, so that the connection between the mounting part 1111 and the housing 200 can be larger.

[0112] In some embodiments, at least a portion of the first insulating member 300 is also disposed within the first through hole 211 and surrounding the protrusion 1120 to insulate the protrusion 1120 from the first through hole 211.

[0113] refer to Figure 4 The first insulating member 300 is not only disposed between the mounting part 1111 and the housing 200, but also extends towards the protrusion. A portion of the first insulating member 300 extends into the first through hole 211. This portion of the first insulating member 300 extending into the first through hole 211 can not only connect the protrusion 1120 and the inner wall of the first through hole 211, but also keep the inner wall of the first through hole 211 and the protrusion 1120 insulated.

[0114] In some embodiments, a second insulating member 600 is also included, at least a portion of which is disposed within the first through hole 211 and surrounds the outer periphery of the protrusion 1120 to insulate the protrusion 1120 from the housing 200.

[0115] refer to Figure 6 In some embodiments, when the first insulating member 300 is adhesive, it may be difficult for the protrusion 1120 to pass through the first through hole 211. Therefore, a second insulating member 600 can be provided inside the first through hole 211. The second insulating member 600 is not adhesive, but it can keep the protrusion 1120 and the inner wall of the first through hole 211 insulated, reducing the assembly difficulty of the first lead-out member 1120.

[0116] It should be noted that, in some embodiments, the connecting portion 1110 and the protrusion 1120 can be integrally formed by stamping, which saves on battery production costs.

[0117] In some embodiments, the end of the protrusion 1120 away from the connecting portion 1110 protrudes from the first wall portion 210.

[0118] The first tab 501 is housed within the receiving cavity, and the first tab 501 is a sheet-like or block-like structure. If the end of the protrusion 1120 that is away from the connecting part 1110 is inside the first through hole 211, then at least a portion of the first tab 501 needs to be disposed inside the first through hole 211 in order to achieve the connection between the first lead 1120 and the first tab 501. This not only makes the operation more difficult, but also increases the safety risk of the battery.

[0119] Therefore, it is necessary to make the end of the protrusion 1120 away from the connecting part 1110 protrude from the first wall part 210, that is, the end of the protrusion 1120 away from the connecting part 1110 extends out of the first through hole 211, so that the first electrode 501 can approach the protrusion 1120 and realize the connection relationship.

[0120] In some embodiments, the thickness of the connecting portion 1110 ranges from [0.2mm, 1.4mm], and / or the thickness of the protrusion 1120 ranges from [0.05mm, 0.3mm].

[0121] As mentioned above, the connecting part 1110 needs to be electrically connected to the external circuit in order to realize the output of the core 500 electrical energy. The thickness of the connecting part 1110 is less than 0.05mm, which is too thin and not conducive to its electrical connection with the external circuit.

[0122] If the thickness of the connecting part 1110 is greater than 1.4mm, although it is convenient to connect to the external circuit, the connecting part 1110 will not only occupy the space in the height (length) direction Z of the battery, thereby reducing the energy density of the battery, but also reduce the connection performance of the first molten pool 701.

[0123] If the thickness of the protrusion 1120 is less than 0.05mm, the protrusion 1120 will be difficult to extend out of the first through hole 211 after passing through the first through hole 211. This will cause the first electrode 501 and the protrusion 1120 to be unable to fit together, resulting in a poor solder joint between the first lead 1110 and the first electrode 501.

[0124] If the thickness of the protrusion 1120 is greater than 0.3 mm, the protrusion 1120 may occupy too much space in the cavity in the height (length) direction of the battery, thereby reducing the energy density of the battery.

[0125] Therefore, the thickness of the connecting part 1110 and the protrusion 1120 needs to be determined according to the production requirements of the housing 200 and the battery. Through the cooperation of multiple parties, the first molten pool 701 can have excellent connection performance, while the battery can have a greater energy density.

[0126] In some embodiments, the length of the first through hole 211 along the first direction X is greater than the width of the first through hole 211 along the second direction Y; and / or, the length of the first lead-out member 1100 along the first direction X is greater than the width of the first lead-out member 1100 along the second direction Y; and / or, the length of the first solder mark 703 along the first direction X is greater than the length of the first solder mark 703 along the second direction Y; wherein, the first direction X is the width direction of the battery, and the second direction Y is the thickness direction of the battery.

[0127] The battery described in this application is suitable for ultra-thin batteries, see reference. Figure 2 and Figure 3At this time, the battery has a very small size in the thickness direction (i.e., the second direction Y). The first through hole 211 is designed such that the length along the first direction X is greater than the width along the second direction Y. This makes it easier to increase the volume of the first lead 1100, thereby improving the current carrying capacity of the first lead 1100.

[0128] It should be noted that, for the first lead-out member 1100, when the length of the first through hole 211 along the first direction X is greater than the width along the second direction Y, the length of the first lead-out member 1100 along the first direction X will also be greater than the width along the second direction Y.

[0129] Meanwhile, the length of the first solder mark 703 along the first direction X is greater than the length of the first solder mark 703 along the second direction Y, which can increase the connection area between the first lead-out member 1100 and the first electrode 501, thereby improving the connection reliability.

[0130] As mentioned above, in some embodiments, the lead-out member 1000 may further include a second lead-out member 1200. That is, when the battery of this application is a steel-cased battery, its casing itself can serve as a polarity lead-out member to output the electrical energy of the electrode core 500.

[0131] The term "steel shell" here is merely an example. Other metal shells that can serve as the second lead-out member 1200 are within the scope of protection of this application and are not limited to steel.

[0132] The second lead-out 1200 will now be described in detail, with reference to the accompanying drawings, as part of the housing 200, so that those skilled in the art can have a clearer and more detailed understanding of the contents of the second lead-out 1200.

[0133] In some embodiments, tab 503 includes a second tab 502; lead-out 1000 includes a second lead-out 1200, and the second lead-out 1200 is part of housing 200; molten pool 700 includes a second molten pool 702, the second molten pool 702 connecting the second lead-out 1200 and the second tab 502; the second molten pool 702 extends from the side of the second lead-out 1200 away from the core 500 toward the second tab 502, and a second solder mark 704 is formed on the surface of the second lead-out 1200 away from the core 500.

[0134] The welding tool performs welding from the outside of the housing 200. The laser enters the second lead 1200 from the side of the second lead 1200 exposed outside the housing 200, thereby welding the second lead 1200 and the second tab 502 and forming a second molten pool 702. At the same time, a second solder mark 704 is also formed on the side of the second lead 1200 exposed outside the housing 200.

[0135] Essentially, the first lead-out 1100 and the second lead-out 1200 are the same in terms of the process of laser injection from outside the housing 200 to form a molten pool. The difference is that the second lead-out 1200 is part of the housing 200.

[0136] refer to Figure 9 The thickness of the second lead-out 1200 is H4, the thickness of the second tab 502 is H5, and the dimension of the second molten pool 702 in the thickness direction of the second lead-out 1200 is H6; H4+0.25H5≤H6≤H4+0.75H5, and H4, H5, and H6 are measured in the same unit.

[0137] During the welding process, the second tab 502 must not be welded through. If it is, the welding laser will damage the electrode core 500. Therefore, H6 ≤ H4 + 0.75H5. However, the depth of the second molten pool 702 in the second tab 502 cannot be too shallow. If it is too shallow, the connection between the second tab 502 and the second lead 1200 will not be strong enough, reducing the reliability of the battery. Therefore, H4 + 0.25H5 ≤ H6.

[0138] In some embodiments, the thickness of the second lead-out 1200 ranges from [0.05mm, 0.3mm]. The second lead-out 1200 is part of the housing 200, that is, the thickness of the second lead-out 1200 is consistent with the thickness of a portion of the wall of the housing 200.

[0139] When the thickness of the second lead-out 1200 is less than 0.05mm, the thickness of part of the wall of the housing 200 is too thin, its rigidity is poor, it is easy to break, and it is difficult to provide good protection for the inside of the battery.

[0140] When the thickness of the second lead-out component 1200 is greater than 0.3mm, the thickness of part of the wall of the housing 200 increases, which will increase the weight of the housing 200 and thus increase the weight of the battery. This goes against the industry's development trend of making batteries thinner and lighter, which will weaken the battery's market competitiveness.

[0141] In some embodiments, the length of the second solder mark 704 along the first direction is greater than the length of the second solder mark 704 along the second direction; the first direction X is the width direction of the battery, and the second direction Y is the thickness direction of the battery.

[0142] Similarly, the battery described in this application is suitable for ultra-thin batteries, see reference. Figure 2 and Figure 3 When the thickness of the battery is very small (second direction Y), setting the length of the second solder mark 704 along the first direction to be greater than the length of the second solder mark 704 along the second direction can increase the connection reliability of the second lead 1200 and the second tab 502.

[0143] In some embodiments, a third insulating element 400 is also included, which is disposed between the electrode core 500 and the lead-out element 1000.

[0144] refer to Figure 1 The electrode core 500 and the housing 200 need to be insulated. When the lead-out member 1000 is located in the first wall portion 210, the third insulating member 400 is located between the electrode core 500 and the first wall portion 210, which can insulate the lead-out member 1000 and the electrode core, improve the reliability of the battery, and avoid short circuits.

[0145] Furthermore, in some embodiments, the third insulating member 400 is provided with a through hole, and the tab 503 passes through the through hole and is connected to the lead-out member 1000; along the thickness direction of the lead-out member 1000, the orthographic projection of the through hole and the orthographic projection of the lead-out member 1000 are at least partially offset.

[0146] refer to Figure 1 The third insulating element 400 is disposed in the receiving cavity and covers the end of the pole core 500 near the lead-out member 1000. A through hole is opened on the third insulating element 400 to facilitate the insertion of the tab 503. In this way, the pole core 500 and the lead-out member 1000 can be insulated while the tab 503 and the lead-out member 1000 are electrically connected.

[0147] If the through hole is located below the lead-out member 1000, and the welding operation penetrates the tab 503, the laser will pass through the through hole and damage the electrode core 500. Therefore, the through hole is located elsewhere in the third insulating member 400, i.e., the orthographic projection of the through hole and the orthographic projection of the lead-out member 1000 are at least partially offset. In this way, the portion of the third insulating member 400 between the lead-out member 1000 and the electrode core 500 can also provide protection for the electrode core 500.

[0148] Finally, it should be emphasized that the battery of this application may include two first leads 1100 with opposite polarities, that is, the battery has two terminals, both of which are connected to the leads 1000 and the tabs 503 by external welding; at the same time, the battery of this application may also include two second leads 1120, that is, the casing 200 includes two casing parts with opposite polarities; or, the battery of this application may be as follows: Figure 5 The diagram shows a first lead-out 1100 and a second lead-out 1200 with opposite polarities. These embodiments are all within the scope of protection of this application. Meanwhile, the first lead-out 1100 can also be a pole, a rivet, or a metal part of other shapes or types, all of which are within the scope of protection of this application, and can achieve welding connection between the first lead-out 1100 and the tab 503 from outside the housing.

[0149] This application also provides a battery assembly, including the battery of this application and a circuit structure electrically connected to the battery of this application. The circuit structure may be a protection board, or it may be an electrical connection component electrically connecting multiple batteries.

[0150] This application also provides an electrical device, including the battery provided in this application, and / or, including the battery assembly provided in this application.

[0151] The electrical equipment provided in this application may be a mobile phone, mobile terminal, or other similar device.

[0152] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0153] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized by, include: The housing (200) has a receiving cavity; The electrode core (500) has a tab (503), the thickness of which is within the range of [0.06mm, 0.12mm]; The pole core (500) is housed in the receiving cavity; A lead-out member (1000) is disposed on the housing (200) and welded to the tab (503) to form a molten pool (700). The molten pool (700) extends from the side of the lead-out member (1000) away from the tab (503) toward the tab (503), and a solder mark (705) is formed on the surface of the lead-out member (1000) away from the tab (503). The sum of the thickness of the lead-out member (1000) and the thickness of the electrode (503) ranges from 0.11 mm to 1.62 mm.

2. The battery of claim 1, wherein, The electrode tab (503) includes a first electrode tab (501), and the lead-out member (1000) includes a first lead-out member (1100). The housing (200) has a first wall portion (210), and the first wall portion (210) is provided with a first through hole (211) extending along the thickness direction of the first wall portion (210). The first lead-out member (1100) passes through the first through hole (211); the molten pool (700) includes a first molten pool (701), which connects the first lead-out member (1100) and the first tab (501). The first molten pool (701) extends from the side of the first lead-out (1100) away from the pole core (500) toward the first tab (501), and a first solder mark (703) is formed on the surface of the first lead-out (1100) away from the pole core (500).

3. The battery of claim 2, wherein, The thickness of the first lead-out member (1100) is H1, the thickness of the first tab (501) is H2, and the dimension of the first molten pool (701) in the thickness direction of the first lead-out member (1100) is H3. H1+0.25H2≤H3≤H1+0.75H2, and H1, H2, and H3 are measured in the same unit.

4. The battery of claim 2, wherein, The thickness of the first lead-out member (1100) is H1, 0.1mm≤H1≤1.5mm.

5. The battery of claim 2, wherein, The first lead-out member (1100) includes a connecting portion (1110) and a protrusion (1120). The protrusion (1120) protrudes from one side of the connecting portion (1110) in the thickness direction. The connecting portion (1110) is located on the side of the first through hole (211) away from the pole core (500). At least a portion of the protrusion (1120) passes through the first through hole (211) so that one end of the protrusion (1120) away from the connecting portion (1110) is connected to the first pole tab (501).

6. The battery of claim 5, wherein, In the thickness direction of the first lead-out member (1100), the orthographic projection of the first molten pool (701) is within the orthographic projection of the protrusion (1120).

7. The battery of claim 5, wherein, The connecting part (1110) has a fixing part (1111) on the side near the housing (200) that is wrapped around the protrusion (1120), and the fixing part (1111) and the housing (200) are fixedly connected.

8. The battery of claim 7, wherein, In the direction from the circumferential edge of the first through hole (211) toward the outer peripheral edge of the fixing part (1111), the minimum size of the fixing part (1111) is greater than or equal to 1 mm.

9. The battery of claim 7, wherein, It also includes a first insulating member (300), at least a portion of which is disposed between the fixing part (1111) and the first wall part (210) and is fixedly connected to the fixing part (1111) and the first wall part (210).

10. The battery of claim 9, wherein, At least a portion of the first insulating member (300) is also disposed within the first through hole (211) and is wrapped around the protrusion (1120) to insulate the protrusion (1120) from the first through hole (211).

11. The battery of claim 9, wherein, It also includes a second insulating member (600), at least a portion of which is disposed within the first through hole (211) and surrounding the outer periphery of the protrusion (1120) to insulate the protrusion (1120) from the housing (200).

12. The battery of claim 5, wherein, The connecting part (1110) and the protrusion (1120) are integrally formed.

13. The battery of claim 5, wherein, The protrusion (1120) protrudes from the first wall portion (210) at one end away from the connecting portion (1110).

14. The battery of claim 5, wherein, The thickness of the connecting part (1110) ranges from [0.2mm, 1.4mm], and / or the thickness of the protrusion (1120) ranges from [0.05mm, 0.3mm].

15. The battery of claim 2, wherein, The length of the first through hole (211) along the first direction is greater than the width of the first through hole (211) along the second direction; and / or The length of the first lead-out member (1100) along the first direction is greater than the width of the first lead-out member (1100) along the second direction; and / or The length of the first solder mark (703) along the first direction is greater than the length of the first solder mark (703) along the second direction; The first direction is the width direction of the battery, and the second direction is the thickness direction of the battery.

16. The battery of any one of claims 1-15, wherein, The tab (503) includes a second tab (502); the lead-out member (1000) includes a second lead-out member (1200), and the second lead-out member (1200) is part of the housing (200); The molten pool (700) includes a second molten pool (702), which is connected to the second lead-out (1200) and the second tab (502). The second molten pool (702) extends from the side of the second lead-out (1200) away from the pole core (500) toward the second tab (502), and a second solder mark (704) is formed on the surface of the second lead-out (1200) away from the pole core (500).

17. The battery of claim 16, wherein, The thickness of the second lead-out (1200) is H4, the thickness of the second tab (502) is H5, and the dimension of the second molten pool (702) in the thickness direction of the second lead-out (1200) is H6; H4+0.25H5≤H6≤H4+0.75H5, where H4, H5, and H6 are measured in the same unit.

18. The battery of claim 16, wherein, The thickness of the second lead-out member (1200) ranges from 0.05mm to 0.3mm.

19. The battery according to claim 16, characterized in that, The length of the second solder mark (704) along the first direction is greater than the length of the second solder mark (704) along the second direction; The first direction is the width direction of the battery, and the second direction is the thickness direction of the battery.

20. The battery of claim 16, wherein, The housing (200) includes a first wall portion (210), the lead-out includes a first lead-out (1100), the first lead-out (1100) is disposed on the first wall portion (210), the second lead-out (1200) is a part of the first wall portion (210), and the first lead-out (1100) and the second lead-out (1200) are insulated from each other.

21. The battery of any one of claims 1-15, wherein, It also includes a third insulating element (400) disposed between the pole core (500) and the lead-out element (1000).

22. The battery of claim 21, wherein, The third insulating member (400) is provided with a through hole, and the electrode (503) passes through the through hole and is connected to the lead-out member (1000); Along the thickness direction of the lead-out member (1000), the orthographic projection of the through hole and the orthographic projection of the lead-out member (1000) are at least partially offset.

23. A battery assembly characterized by, The invention includes the battery as described in any one of claims 1-22, and a circuit structure electrically connected to the battery.

24. An electrical device, comprising: Includes the battery as described in any one of claims 1-22, and / or the battery assembly as described in claim 23.

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