Battery and power consuming device

Abstract

The application relates to the technical field of batteries, and particularly discloses a battery and a power consumption device, wherein the battery comprises a shell, a cover plate, a pole assembly, adhesive tape and two battery cells. The shell is provided with an opening, the cover plate covers and seals the opening, and the pole assembly is arranged on the cover plate; the two battery cells are arranged inside the shell and lead out a plurality of tabs towards the opening; the two battery cells are connected with the pole assembly at the same time, wherein the tabs with the same polarity are welded with the pole assembly and form a first welding area; the adhesive tape is arranged at least in the first welding area and covers the welding slag formed by the welding of the tabs and the pole assembly, the adhesive tape covers the tabs with the same polarity of the two battery cells at the same time, and the projection area of the adhesive tape on the cover plate is 1.2 to 5 times the area of all the first welding areas. In the application, the welding area is physically covered by the adhesive tape, the welding slag formed by the splashing of molten metal is directly blocked from falling off, the risk of the welding slag entering the inside of the battery is reduced, the welding quality is ensured, and the safety and manufacturing yield of the battery are improved.

Description

Technical Field

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

[0002] In battery manufacturing, tabs are typically electrically connected to adapter plates via welding to form external electrode lead-out structures. However, during welding, due to high energy input and molten metal spatter, weld slag is easily generated in the welding area.

[0003] If these weld slags are not effectively controlled, they can easily detach from the welding area and fall into the battery. Especially between the positive and negative electrodes, they can potentially puncture the separator or directly cause a short circuit, leading to serious safety hazards such as micro-short circuits, thermal runaway, and even fire and explosion. Furthermore, weld slag residue can also affect the cleanliness of subsequent processes and the reliability of the battery, reducing product yield.

[0004] Although existing processes employ measures such as dust extraction, baffles, and inert gas protection to reduce welding slag spatter, these methods cannot completely eliminate the generation and shedding of welding slag. Especially on high-speed automated production lines, welding slag control remains a technical challenge. Utility Model Content

[0005] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions: In a first aspect, embodiments of this application propose a battery comprising a casing, a cover plate, an electrode assembly, an adhesive tape, and two battery cells. The casing has an opening, the cover plate seals the opening, and the electrode assembly is disposed on the cover plate; the two battery cells are disposed inside the casing, with multiple tabs extending toward the opening; both battery cells are simultaneously connected to the electrode assembly, wherein tabs of the same polarity are welded to the electrode assembly to form a first welding area; the adhesive tape is disposed at least in the first welding area and covers the weld slag formed by welding the tabs and the electrode assembly, the adhesive tape simultaneously covers the tabs of the same polarity of the two battery cells, and the ratio of the projected area of ​​the adhesive tape on the cover plate to the area of ​​all the first welding areas is 1.2 to 5.

[0006] Secondly, this application proposes an electrical device that includes the battery of the first aspect.

[0007] The technical solution proposed in this application has at least the following technical effects: In the above solution, the welding area is physically covered with tape, which directly prevents the weld slag formed by molten metal splashing from falling off, thereby reducing the risk of weld slag entering the battery. This ensures welding quality while improving battery safety and manufacturing yield. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the battery structure described in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the battery cell described in some embodiments of this application; Figure 3 This is an isometric schematic diagram of the cover plate described in some embodiments of this application; Figure 4 This is a top view schematic diagram of the battery section structure described in some embodiments of this application; Figure 5 This is a cross-sectional schematic diagram of the battery portion structure described in some embodiments of this application; Figure 6 for Figure 5 Enlarged schematic diagram of the middle part of the structure.

[0010] Explanation of reference numerals in the attached figures: 10. Housing; 20. Cover plate; 30. Terminal assembly; 301. Terminal body; 302. Adapter piece; 40. Battery cell; 401. Tab; 4011. First welding area; 4012. Second welding area; 50. Lower plastic; 60. Adhesive tape. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all 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.

[0012] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0013] Firstly, referring to Figures 1 to 6This application provides an embodiment of a battery comprising a housing 10, a cover plate 20, an electrode assembly 30, an adhesive tape 60, and two battery cells 40. The housing 10 has an opening, which is sealed by the cover plate 20, and the electrode assembly 30 is disposed on the cover plate 20. The two battery cells 40 are disposed inside the housing 10 and have multiple tabs 401 extending toward the opening. The two battery cells 40 are simultaneously connected to the electrode assembly 30, wherein the tabs 401 of the same polarity are welded to the electrode assembly 30 to form a first welding area 4011. The adhesive tape 60 is disposed at least in the first welding area 4011 and covers the weld slag formed by welding the tabs 401 and the electrode assembly 30. The adhesive tape 60 also covers the tabs 401 of the same polarity of the two battery cells 40. The ratio of the projected area of ​​the adhesive tape 60 on the cover plate 20 to the area of ​​all the first welding areas 4011 is 1.2 to 5.

[0014] In this embodiment, by physically covering the welding area with tape 60, the welding slag formed by molten metal splashing is directly blocked from falling off, thereby reducing the risk of welding slag entering the battery. While ensuring welding quality, this improves battery safety and manufacturing yield.

[0015] In addition, this embodiment also needs to balance the coverage area of ​​the tape 60 to ensure the coverage of welding slag, facilitate production and processing, and avoid interference between the tape 60 and other parts such as insulating adhesives.

[0016] In some embodiments, the pole assembly 30 includes a pole body 301, with a tab 401 of the same polarity directly welded to the pole body 301, and the ratio of the projected area of ​​the tape 60 on the cover plate 20 to the area of ​​all the first welding areas 4011 is 1.2 to 3.

[0017] In this embodiment, one implementation of the electrode assembly 30 is proposed. The electrode body 301 and the tab 401 are directly welded, reducing the need for adapter plates. After the tabs of the two cells are pre-welded, they are staggered and overlapped at the electrode body 301. Laser welding is used to weld the tabs 401 of the two cells to the electrode body 301. The welding area is relatively small, and less welding slag is generated. Therefore, the ratio of the projected area of ​​the tape 60 to the first welding area 4011 can be controlled to be 1.2 to 3.

[0018] In some embodiments, refer to Figure 4 and Figure 5 The pole assembly 30 includes a pole body 301 and an adapter plate 302. A tab 401 of the same polarity is welded to the adapter plate 302, and the adapter plate 302 is welded to the pole body 301. The first welding area 4011 includes the welding area of ​​the tab 401 and the adapter plate 302 and the welding area of ​​the adapter plate 302 and the pole body 301.

[0019] In this embodiment, another implementation of the pole assembly 30 is proposed, wherein the pole body 301 is welded to the tab 401 via the adapter piece 302, and adhesive tape 60 is provided at the welding positions of the pole body 301 and the tab 401 to the adapter piece 302, which is also a preferred implementation.

[0020] In some embodiments, tape 60 completely covers all of the first welding area 4011.

[0021] In this embodiment, the tape 60 fully covers the first welding area 4011, eliminating dead corners of welding slag residue and significantly reducing the possibility of welding slag entering the battery.

[0022] In some embodiments, refer to Figure 4 Multiple tabs 401 are gathered together and welded together to form a tab 401 group, and a second welding area 4012 is formed on the tab 401 group. The tape 60 completely covers all the second welding areas 4012.

[0023] In this embodiment, the tabs 401 are gathered and welded together to form a group of tabs 401, which reduces the number of welding points, lowers the risk of incomplete welding, and improves the connection strength. In addition, the tape 60 covering the second welding area 4012 can simultaneously protect the welding slag from falling from the first welding area 4011 and the second welding area 4012.

[0024] In some embodiments, refer to Figure 3 The battery also includes a lower plastic 50, which is disposed on the side of the cover plate 20 near the cell 40, and the tape 60 partially covers the lower surface of the lower plastic 50.

[0025] In this embodiment, the lower plastic 50 is typically used for insulation and support. The tape 60 covering its surface can enhance the insulation between the battery cell and the cover plate. On the other hand, a portion of the tape 60 covers the first welding area 4011 and the second welding area 4012 to prevent welding slag from falling off. Since the surface of the welding area is uneven, the peel strength between the tape 60 and the first welding area 4011 / second welding area 4012 is relatively small. Therefore, a portion of the tape 60 covers the lower surface of the lower plastic 50, which can further enhance the peel strength between the tape 60 and the first welding area 4011 / second welding area 4012.

[0026] In some embodiments, the battery further includes a lower plastic 50, and an adhesive tape 60 completely covers the first welding area 4011, the second welding area 4012, a portion of the lower plastic 50, and the non-welding area of ​​the adapter piece 302.

[0027] In this embodiment, the tape 60 focuses on protecting the area where welding slag is generated and fully covers the periphery of the area where welding slag is generated, including part of the non-welding area of ​​the lower plastic 50 and the adapter piece 302. The peel strength between the lower plastic 50 and the adapter piece 302 and the tape 60 is different. The tape 60 covers different material surfaces, which further enhances the peel strength between the tape 60 and the first welding area 4011 / second welding area 4012 and prevents the tape 60 from falling off.

[0028] In some embodiments, the tape 60 is integrally formed.

[0029] In this embodiment, the tape 60 is integrally formed, which improves the strength of the tape 60, eliminates the gaps between the tape 60 joints, and prevents welding slag from seeping in from the edges.

[0030] In some embodiments, the tape 60 falls entirely within the projection surface of the cover plate 20.

[0031] In this embodiment, the tape 60 falls entirely within the projection surface of the cover plate 20, preventing the tape 60 from exceeding the range of the cover plate 20 and causing assembly interference. At the same time, it ensures that the covered area and the welding area are accurately positioned and strictly aligned, reducing redundant materials.

[0032] In some embodiments, the peel strength of tape 60 is from 0.02 N / mm to 4 N / mm.

[0033] In this embodiment, the peel strength of the tape 60 is ensured to prevent the tape 60 from falling off during welding high temperatures or vibrations.

[0034] In some embodiments, the thickness of the tape 60 is 0.03 mm to 2 mm in a direction perpendicular to the cover plate 20.

[0035] In this embodiment, the appropriate thickness of the tape 60 balances protection and flexibility, ensuring its own structural strength and adhesion performance, while preventing it from occupying too much space and affecting the fit between the tab 401 and the pole assembly 30.

[0036] In some embodiments not shown in the figures, the tabs 401 of the same polarity of the two cells 40 overlap.

[0037] In this embodiment, a positional relationship is proposed for the same polarity tabs 401 of the two battery cells 40. The same polarity tabs 401 of the two battery cells 40 overlap, increasing the contact area of ​​the tabs 401 and reducing the contact resistance. The tape 60 covers the overlapping area to prevent the accumulation of welding slag.

[0038] In some embodiments, refer to Figure 4 The tabs 401 of the same polarity of the two cells 40 do not overlap.

[0039] In this embodiment, an alternative positional relationship is proposed for the same polarity tabs 401 of the two battery cells 40, in which the same polarity tabs 401 of the two battery cells 40 do not overlap, which is also a desirable implementation method.

[0040] In some embodiments, refer to Figure 5 and Figure 6 An insulating tape 70 is provided on the battery cell 40, and the insulating tape 70 covers the battery cell 40 and part of the tab 401 in sequence, with the insulating tape 70 at least partially overlapping the tape 60.

[0041] In some embodiments, the ratio of the projected area of ​​the overlapping portion of the insulating tape 70 and tape 60 on the cover plate to the area of ​​tape 60 is 0.1 to 0.4.

[0042] In this embodiment, the insulating tape 70 and the tape 60 overlap at least partially to prevent welding slag from getting stuck and to completely prevent welding slag from penetrating. In addition, the overlapping area should not be too large to avoid occupying too much internal space of the battery or squeezing or interfering with other structures.

[0043] Secondly, this application proposes an electrical device that includes the battery of the first aspect.

[0044] In this embodiment, the power-consuming device of the second aspect includes the battery of the first aspect, and therefore the power-consuming device of the second aspect includes all the technical effects of the battery of the first aspect.

[0045] It should be noted that electrical devices may include, but are not limited to, energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, aerospace equipment, etc.

[0046] In particular, the term "and / or" in this application should be understood as follows: In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0047] In the second case, the term "and / or" between the last two of three or more subjects means including at least one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject; Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.

[0048] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery, characterized in that, include: The housing (10) has an opening; A cover plate (20) and a pole assembly (30), wherein the cover plate (20) covers the opening and the pole assembly (30) is disposed on the cover plate (20); Two battery cells (40) are disposed inside the housing (10) and multiple tabs (401) are led out toward the opening; the two battery cells (40) are simultaneously connected to the terminal assembly (30), wherein the tabs (401) of the same polarity are welded to the terminal assembly (30) to form at least one first welding area (4011). The tape (60) is provided at least in the first welding area (4011) and covers the welding slag formed by welding the tabs (401) and the terminal assembly (30). The tape (60) also covers the same polarity tabs (401) of the two cells (40). The ratio of the projected area of ​​the tape (60) on the cover plate (20) to the area of ​​all the first welding areas (4011) is 1.2 to 5.

2. The battery according to claim 1, characterized in that, The pole assembly (30) includes a pole body (301), and the same polarity pole tabs (401) are directly welded to the pole body (301). The ratio of the projected area of ​​the tape (60) on the cover plate (20) to the area of ​​all the first welding areas (4011) is 1.2 to 3.

3. The battery according to claim 1, characterized in that, The pole assembly (30) includes a pole body (301) and an adapter plate (302). The tabs (401) of the same polarity are welded to the adapter plate (302), and the adapter plate (302) is welded to the pole body (301). The first welding area (4011) includes the welding area of ​​the tabs (401) and the adapter plate (302) and the welding area of ​​the adapter plate (302) and the pole body (301).

4. The battery according to any one of claims 1 to 3, characterized in that, The tape (60) completely covers all of the first welding area (4011).

5. The battery according to claim 4, characterized in that, Multiple tabs (401) are gathered together and welded together to form a tab (401) group, and a second welding area (4012) is formed on the tab (401) group, and the tape (60) completely covers all the second welding areas (4012).

6. The battery according to claim 5, characterized in that, The battery also includes a lower plastic (50) disposed on the side of the cover plate (20) near the cell (40), and the tape (60) partially covers the lower surface of the lower plastic (50).

7. The battery according to claim 6, characterized in that, The pole assembly (30) includes a pole body (301) and an adapter plate (302). The tabs (401) of the same polarity are welded to the adapter plate (302), and the adapter plate (302) is welded to the pole body (301). The tape (60) completely covers the first welding area (4011), the second welding area (4012), part of the lower plastic (50), and the non-welding area of ​​the adapter plate (302).

8. The battery according to claim 1, characterized in that, The tape (60) is integrally formed.

9. The battery according to claim 1, characterized in that, The tape (60) falls completely within the projection surface of the cover plate (20).

10. The battery according to claim 1, characterized in that, The peel strength of the tape (60) is from 0.02 N / mm to 4 N / mm.

11. The battery according to claim 1, characterized in that, Along the direction perpendicular to the cover plate, the thickness of the tape (60) is 0.03 mm to 2 mm.

12. The battery according to claim 1, characterized in that, The tabs (401) of the same polarity of the two said cells (40) overlap.

13. The battery according to claim 1, characterized in that, The tabs (401) of the same polarity of the two said cells (40) do not overlap.

14. The battery according to claim 1, characterized in that, Insulating tape (70) is provided on the battery cell (40), and the insulating tape (70) sequentially covers the battery cell (40) and part of the tab (401), and the insulating tape (70) at least partially overlaps with the tape (60).

15. The battery according to claim 14, characterized in that, The ratio of the projected area of ​​the overlapping portion of the insulating tape (70) and the tape (60) on the cover plate to the area of ​​the tape (60) is 0.1 to 0.

4.

16. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 15.

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