Battery cell structure, single battery and electric device

Abstract

This application discloses a battery cell structure, a single battery cell, and a power-consuming device. The battery cell structure includes: an electrode assembly with a tab connected to one end; a conductor, welded to the end of the tab furthest from the electrode assembly, forming a solder area, with the tab located between the conductor and the electrode assembly; a first protective adhesive film adhered to the end of the electrode assembly near the tab; and a second protective adhesive film adhered to the conductor or the tab, covering the solder area. The battery cell structure provided by this application can reduce the probability of the tab tearing due to the protective adhesive film.

Description

Technical Field

[0001] This application relates to the field of new energy battery technology, and in particular to a cell structure, a single cell, and an electrical device. Background Technology

[0002] During the production of battery cells, insulating tape is usually pasted onto the surface of the tabs to provide insulation.

[0003] In related technologies, insulating tape is pasted on the entire front and back of the electrode tabs. When the battery cell expands or shifts, the electrode tabs are stretched by the insulating tape, which can easily tear, affecting the battery cell's capacity and safety performance. Utility Model Content

[0004] This application provides a cell structure, a single battery cell, and an electrical device that reduces the probability of the tabs tearing due to the protective adhesive tape.

[0005] In a first aspect, this application provides a battery cell structure, including:

[0006] An electrode assembly, one end of which is connected to a tab;

[0007] A guide fluid is welded to the end of the tab furthest from the electrode assembly, forming a solder area, with the tab located between the guide fluid and the electrode assembly;

[0008] The first protective adhesive tape is affixed to the end of the electrode assembly near the tab.

[0009] The second protective adhesive tape is pasted onto the fluid conductor or the electrode tab and covers the solder area.

[0010] In some possible implementations, the second protective adhesive tape includes a first structural segment, a second structural segment, and a third structural segment, the second structural segment covering the soldering area, and the first structural segment and the third structural segment being located on two sides parallel to the second structural segment.

[0011] In some possible implementations, the cell structure includes a first electrode assembly and a second electrode assembly, the cell structure having a thickness direction, and the first electrode assembly and the second electrode assembly being disposed on opposite sides of the fluid conductor along the thickness direction;

[0012] The first electrode assembly has a first tab connected to one end facing the fluid conductor, and the end of the first tab away from the first electrode assembly is welded to the fluid conductor to form a first solder mark area. The second electrode assembly has a second tab connected to one end facing the fluid conductor, and the end of the second tab away from the electrode assembly is welded to the fluid conductor to form a second solder mark area.

[0013] The second protective adhesive tape covers both the first soldering area and the second soldering area.

[0014] In some possible implementations, the second protective adhesive tape includes a first structural segment, a second structural segment, and a third structural segment, wherein the first structural segment and the third structural segment are respectively disposed on two sides parallel to the second structural segment;

[0015] The second structural segment covers the first solder area and the second solder area, the first structural segment is located on the side of the first solder area away from the second solder area, and the third structural segment is located on the side of the second solder area away from the first solder area.

[0016] In some possible implementations, the second protective adhesive tape includes a first structural segment, a second structural segment, and a third structural segment, wherein the first structural segment and the third structural segment are respectively disposed on two sides parallel to the second structural segment;

[0017] The second structural segment covers the first solder area and the second solder area, the first structural segment is located at the same end of the first solder area and the second solder area, and the third structural segment is located at the other end of the first solder area and the other end of the second solder area.

[0018] In some possible implementations, the first and third structural segments are configured as colored structures, and the second structural segment is configured as a transparent structure.

[0019] In some possible implementations, the first structural segment, the second structural segment, and the third structural segment are connected in sequence, the first structural segment and the third structural segment are both bonded to the fluid guide, and the second structural segment is separately disposed from the fluid guide.

[0020] In some possible implementations, the electrode assembly includes a vertical first surface and a second surface, with the tab connected to the second surface;

[0021] The first protective adhesive paper is bonded to a portion of the first surface and a portion of the second surface, and extends to the connection position between the tab and the second surface.

[0022] Secondly, this application also provides a single-cell battery, including the cell structure described in the above embodiments.

[0023] Thirdly, this application also provides an electrical device, including the battery cell structure described in the above embodiments.

[0024] The beneficial effects of this application are as follows: In the cell structure provided by this application, the first protective adhesive paper pasted at the electrode tab position and the second protective adhesive paper pasted at the soldering area are separate structures. When the electrode assembly expands or shifts, the protective adhesive paper can be prevented from pulling on the electrode tab, reducing the probability of the electrode tab tearing due to pulling, reducing the generation of defective cell structures, improving product yield, and ensuring the capacity and safety performance of the cell. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 Schematic diagrams of the cell structure in some embodiments are shown;

[0027] Figure 2 A side view of the cell structure in some embodiments is shown;

[0028] Figure 3 Schematic diagrams of the cell structure in other embodiments are shown;

[0029] Figure 4 Schematic diagrams of the cell structure are shown in some other embodiments;

[0030] Figure 5 A schematic diagram of the structure of the second protective adhesive paper in some embodiments is shown.

[0031] Explanation of key component symbols:

[0032] 100 - Electrode assembly; 101 - First surface; 102 - Second surface; 110 - First electrode assembly; 120 - Second electrode assembly;

[0033] 200 - Electrode; 210 - First Electrode; 220 - Second Electrode;

[0034] 300 - Fluid guide; 310 - Soldering area; 311 - First soldering area; 312 - Second soldering area;

[0035] 400 - First protective adhesive tape;

[0036] 500 - Second protective adhesive tape; 501 - Base film; 502 - First adhesive layer; 503 - Second adhesive layer; 510 - First structural segment; 520 - Second structural segment; 530 - Third structural segment;

[0037] 600 - Top Cover;

[0038] X - Thickness direction. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of these 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 this application, and should not be construed as limiting this application.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] like Figure 1 As shown, the embodiment provides a battery cell structure, including an electrode assembly 100, a fluid conductor 300, a first protective adhesive paper 400, and a second protective adhesive paper 500.

[0045] One end of the electrode assembly 100 is connected to a tab 200. The end of the tab 200 away from the electrode assembly 100 can be soldered to the fluid conductor 300, forming a solder area 310. A first protective adhesive tape 400 can be pasted on the end of the electrode assembly 100 near the tab 200, providing insulation and protection at the connection point between the tab 200 and the electrode assembly 100. A second protective adhesive tape 500 is pasted on the side of the fluid conductor 300 facing the tab 200, or the second protective adhesive tape 500 is bonded to the side of the tab 200 away from the fluid conductor 300, covering the solder area 310, providing insulation and protection for the solder area 310.

[0046] In this embodiment, the first protective adhesive paper 400 pasted on the electrode assembly 100 near the tab 200 and the second protective adhesive paper 500 pasted on the soldering area 310 are separate structures. When the electrode assembly 100 expands or shifts, the protective adhesive paper can prevent the tab 200 from being pulled, reducing the probability of the tab 200 tearing due to pulling, reducing the generation of defective cells, improving product yield, and ensuring the capacity and safety performance of the cells.

[0047] like Figure 1 and Figure 2 As shown, in some embodiments, the electrode assembly 100 includes a first surface 101 and a second surface 102 that are perpendicular to each other. The first surface 101 may be the side surface of the electrode assembly 100 with the largest area, i.e., the large surface of the electrode assembly 100. The second surface 102 may be located on the side of the electrode assembly 100 facing the guide fluid 300.

[0048] In this embodiment, the tab 200 can be connected to the second surface 102. One end of the first protective adhesive tape 400 can be adhered to the portion of the first surface 101 near the second surface 102, and the other end of the first protective adhesive tape 400 can be adhered to the portion of the second surface 102 near the first surface 101. The first protective adhesive tape 400 can extend to the connection point between the tab 200 and the second surface 102. Therefore, during welding and use, the first protective adhesive tape 400 can prevent welding spatter and other debris from entering the electrode assembly 100 from the side facing the guide fluid 300 and causing damage to the electrode assembly 100. This improves the product yield of the cell structure and extends its service life. Furthermore, the first protective adhesive tape 400 also provides insulation protection for the connection point between the tab 200 and the electrode assembly 100, ensuring the normal use of the cell structure and reducing the probability of short circuits and other problems.

[0049] like Figure 3 As shown, in some embodiments, the cell structure has a thickness direction X. The cell structure may include a first electrode assembly 110 and a second electrode assembly 120. The first electrode assembly 110 and the second electrode assembly 120 may be disposed on opposite sides of the fluid conductor 300 along the thickness direction X.

[0050] In some embodiments, a first electrode assembly 110 is connected to a first tab 210 at one end facing the fluid guide 300, and the end of the first tab 210 away from the first electrode assembly 110 is soldered to the fluid guide 300 to form a first solder area 311. A second electrode assembly 120 is connected to a second tab 220 at one end facing the fluid guide 300, and the end of the second tab 220 away from the second electrode assembly 120 is soldered to the fluid guide 300 to form a second solder area 312.

[0051] In this embodiment, the polarity of the first tab 210 may be the same as that of the second tab 220, and the first tab 210 and the second tab 220 may be connected to the same fluid conductor 300. Exemplarily, both the first tab 210 and the second tab 220 may be positive tabs.

[0052] In this embodiment, a first protective adhesive tape 400 can be pasted on the connection position of the first electrode assembly 110 near the first tab 210 and the connection position of the second electrode assembly 120 near the second tab 220 to provide insulation and protection, reduce the probability of spatter during welding and debris during use entering the interior of the first electrode assembly 110 and the second electrode assembly 120, ensure the working performance of the cell structure, and extend the service life of the cell structure.

[0053] like Figure 3As shown, in some embodiments, the second protective adhesive tape 500 can simultaneously cover the first soldering area 311 and the second soldering area 312, and can provide protection for both the first soldering area 311 and the second soldering area 312. Specifically, during the soldering process, the second protective adhesive tape 500 can prevent spatter generated during the soldering process from entering the first electrode assembly 110 and the second electrode assembly 120 and puncturing the diaphragm and / or electrode sheet, causing damage to the electrode assembly 100. On the other hand, the second protective adhesive tape 500 can provide insulation for the first soldering area 311 and the second soldering area 312, reducing the probability of short circuits and other problems, and improving the safety of the cell structure.

[0054] In other embodiments, the battery cell assembly may also include a first electrode assembly 110 (or a second electrode assembly 120). Correspondingly, a second protective adhesive tape 500 may cover the first soldering area 311 (or the second soldering area 312).

[0055] In the embodiments, both the first electrode assembly 110 and the second electrode assembly 120 may include a positive electrode tab and a negative electrode tab. The connection method and adhesive application method of the two negative electrode tabs in the first electrode assembly 110 and the second electrode assembly 120 are similar to the connection method and adhesive application method of the first electrode tab 210 and the second electrode tab 220, which serve as positive electrode tabs, and will not be described in detail here.

[0056] like Figure 3As shown, in some embodiments, the periphery of the second protective adhesive tape 500 may protrude relative to the edges of the first solder area 311 and the second solder area 312, meaning the second protective adhesive tape 500 completely covers the first solder area 311 and the second solder area 312. Furthermore, the distance between each side of the second protective adhesive tape 500 and the opposite side of the first solder area 311 is greater than or equal to 1 mm, and the distance between each side of the second protective adhesive tape 500 and the opposite side of the second solder area 312 is also greater than or equal to 1 mm. For example, the distance between the side of the second protective adhesive tape 500 facing the first electrode assembly 110 and the side of the first solder area 311 facing the first electrode assembly 110 may be greater than or equal to 1 mm. The distance between the side of the second protective adhesive tape 500 facing the second electrode assembly 120 and the side of the second solder area 312 facing the second electrode assembly 120 is greater than or equal to 1 mm. The distance between one side of the second protective adhesive tape 500 parallel to the thickness direction X and the opposite side of the first solder area 311 is greater than or equal to 1 mm. The distance between the other side of the second protective adhesive tape 500 parallel to the thickness direction X and the opposite side of the first solder area 311 is also greater than or equal to 1 mm. This ensures that the second protective adhesive tape 500 completely covers the first solder area 311 and the second solder area 312, effectively preventing spatter generated during welding from entering the first electrode assembly 110 and the second electrode assembly 120. Simultaneously, it provides sufficient area for insulation protection, improving the product yield of the battery cell structure.

[0057] For example, in some embodiments, the distance between each side of the second protective adhesive tape 500 and the opposite side of the first soldering area 311 and the second soldering area 312 can be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm or any other size greater than 1 mm.

[0058] like Figure 3 As shown, in some embodiments, the cell structure further includes a top cover 600, which may be located on the side of the fluid conductor 300 opposite to the tab 200. An electrode post on the top cover 600 with the same polarity as the fluid conductor 300 may be welded to the fluid conductor 300. In this embodiment, the end of the second protective adhesive paper 500 facing the negative tab may protrude relative to the fluid conductor 300 and be bonded to the top cover 600.

[0059] like Figure 3 and Figure 4As shown, in some embodiments, the second protective adhesive tape 500 may include a first structural segment 510, a second structural segment 520, and a third structural segment 530. The second structural segment 520 may simultaneously cover the first soldering area 311 and the second soldering area 312. The first structural segment 510 and the third structural segment 530 may be respectively disposed on two parallel sides of the second structural segment 520, that is, the first structural segment 510, the second structural segment 520, and the third structural segment 530 may be sequentially connected along the thickness direction X or sequentially disposed along a direction perpendicular to the thickness direction X. The first structural segment 510 and the third structural segment 530 may have a symmetrical or asymmetrical structure with respect to the second structural segment 520. In some embodiments, the first structural segment 510, the second structural segment 520, and the third structural segment 530 may be an integral structure.

[0060] like Figure 3 As shown, in some embodiments, the first structural segment 510 may be located at the same end of the first solder area 311 and the second solder area 312, that is, the first structural segment 510 may be connected to one side of the second structural segment 520 parallel to the thickness direction X. The third structural segment 530 may be located at the other end of the first solder area 311 and the other end of the second solder area 312, that is, the third structural segment 530 may be connected to another side of the second structural segment 520 parallel to the thickness direction X, and disposed opposite to the first structural segment 510. In some embodiments, the third structural segment 530 may protrude relative to the fluid guide 300 and be bonded to the top cover 600.

[0061] like Figure 4 As shown, in some embodiments, the first structural segment 510 may be located on the side of the first solder area 311 away from the second solder area 312, that is, the first structural segment 510 may be connected to the side of the second structural segment 520 facing the first electrode assembly 110. The third structural segment 530 may be located on the side of the second solder area 312 away from the first solder area 311, that is, the third structural segment 530 may be connected to the side of the second structural segment 520 facing the second electrode assembly 120. The ends of the first structural segment 510, the second structural segment 520, and the third structural segment 530 facing the negative electrode tab are all protruding relative to the fluid guide 300 and connected to the top cover 600.

[0062] like Figure 3 As shown, in some embodiments, both the first structural segment 510 and the third structural segment 530 can be configured as colored structures, which facilitates visual recognition and positioning during the pasting process. The second structural segment 520 can be configured as a transparent structure, which facilitates visual recognition and judgment of the solder area 310 and its surroundings. For example, it can help identify whether the welding of the tab 200 and the fluid guide 300 is qualified.

[0063] like Figure 3 and Figure 5As shown, in some embodiments, the second protective adhesive tape 500 may include a base film 501, a first adhesive layer 502, and a second adhesive layer 503. The first adhesive layer 502 and the second adhesive layer 503 are both disposed on the same side of the base film 501, with the first adhesive layer 502 covering the area where the first structural segment 510 is located, and the second adhesive layer 503 covering the area where the third structural segment 530 is located.

[0064] In this embodiment, the first structural segment 510 can be bonded to the fluid guide 300 via the first adhesive layer 502, and the third structural segment 530 can be bonded to the fluid guide 300 and / or the top cover 600 via the second adhesive layer 503. Furthermore, the second structural segment 520 is separately disposed from the fluid guide 300, meaning there is no direct connection between the second structural segment 520 and the fluid guide 300. This prevents the second structural segment 520 from causing pulling or other problems to the first tab 210 of the first solder area 311 and the second tab 220 of the second solder area 312, further reducing the probability of tearing of the first tab 210 and the second tab 220.

[0065] In some embodiments, the first structural segment 510 can be connected to the first tab 210 and the second tab 220 on the same side of the first solder area 311 and the second solder area 312 via the first adhesive layer 502 and is spaced apart from the first solder area 311 and the second solder area 312. The third structural segment 530 can be connected to the first tab 210 and the second tab 220 on the other side of the first solder area 311 and the second solder area 312 via the second adhesive layer 503 and is spaced apart from the first solder area 311 and the second solder area 312. The second structural segment 520 is separated from the first solder area 311 and the second solder area 312, that is, the second structural segment 520 does not have a direct connection with the solder. Therefore, it can prevent the second structural segment 520 from causing problems such as pulling on the first tab 210 of the first solder area 311 and the second tab 220 of the second solder area 312, and further reduce the probability of tearing of the first tab 210 and the second tab 220. In some embodiments, the second structural segment 520 may be configured as a transparent structure, and the first structural segment 510 and the third structural segment 530 may be configured as colored structures for visual recognition and judgment. For example, it can help to identify whether the welding of the tab 200 and the fluid conductor 300 is qualified.

[0066] The embodiment also provides a single-cell battery, including a housing and the cell structure provided in the embodiment. The electrode assembly 100 and the fluid guide 300 can be disposed within a cavity formed by the housing and the top cover 600. The fluid guide 300 can be welded to electrode posts of the same polarity on the top cover 600.

[0067] The embodiment also provides an electrical device, which may include the battery cell structure provided in the embodiment.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] 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.

Claims

1. A battery cell structure, characterized in that, include: An electrode assembly (100) is provided with a tab (200) at one end. A fluid conductor (300) is welded to the end of the tab (200) away from the electrode assembly (100) to form a solder area (310), and the tab (200) is located between the fluid conductor (300) and the electrode assembly (100); The first protective adhesive tape (400) is attached to one end of the electrode assembly (100) near the tab (200); The second protective adhesive tape (500) is pasted onto the fluid guide (300) or the tab (200) and covers the solder area (310).

2. The cell structure according to claim 1, characterized in that, The second protective adhesive tape (500) includes a first structural segment (510), a second structural segment (520) and a third structural segment (530). The second structural segment (520) covers the soldering area (310). The first structural segment (510) and the third structural segment (530) are respectively located on two sides parallel to the second structural segment (520).

3. The cell structure according to claim 1, characterized in that, The cell structure includes a first electrode assembly (110) and a second electrode assembly (120). The cell structure has a thickness direction (X). The first electrode assembly (110) and the second electrode assembly (120) are respectively disposed on opposite sides of the fluid conductor (300) along the thickness direction (X). The first electrode assembly (110) has a first tab (210) connected to one end facing the fluid conductor (300). The end of the first tab (210) away from the first electrode assembly (110) is welded to the fluid conductor (300) to form a first solder area (311). The second electrode assembly (120) has a second tab (220) connected to one end facing the fluid conductor (300). The end of the second tab (220) away from the electrode assembly (100) is welded to the fluid conductor (300) to form a second solder area (312). The second protective adhesive tape (500) covers both the first soldering area (311) and the second soldering area (312).

4. The cell structure according to claim 3, characterized in that, The second protective adhesive tape (500) includes a first structural segment (510), a second structural segment (520) and a third structural segment (530), wherein the first structural segment (510) and the third structural segment (530) are respectively disposed on two sides parallel to the second structural segment (520); The second structural segment (520) covers the first solder area (311) and the second solder area (312), the first structural segment (510) is located on the side of the first solder area (311) away from the second solder area (312), and the third structural segment (530) is located on the side of the second solder area (312) away from the first solder area (311).

5. The cell structure according to claim 3, characterized in that, The second protective adhesive tape (500) includes a first structural segment (510), a second structural segment (520) and a third structural segment (530), wherein the first structural segment (510) and the third structural segment (530) are respectively disposed on two sides parallel to the second structural segment (520); The second structural segment (520) covers the first solder area (311) and the second solder area (312), the first structural segment (510) is located at the same end of the first solder area (311) and the second solder area (312), and the third structural segment (530) is located at the other end of the first solder area (311) and the other end of the second solder area (312).

6. The cell structure according to claim 2, 4 or 5, characterized in that, The first structural segment (510) and the third structural segment (530) are configured as colored structures, and the second structural segment (520) is configured as a transparent structure.

7. The cell structure according to claim 2, 4 or 5, characterized in that, The first structural segment (510), the second structural segment (520) and the third structural segment (530) are connected in sequence. The first structural segment (510) and the third structural segment (530) are both bonded to the fluid guide (300), and the second structural segment (520) is separated from the fluid guide (300).

8. The cell structure according to claim 1, characterized in that, The electrode assembly (100) includes a vertical first surface (101) and a second surface (102), and the tab (200) is connected to the second surface (102). The first protective adhesive tape (400) is bonded to a portion of the first surface (101) and a portion of the second surface (102) respectively, and extends to the connection position between the tab (200) and the second surface (102).

9. A single-cell battery, characterized in that, Including the cell structure as described in any one of claims 1 to 8.

10. An electrical device, characterized in that, Including the cell structure as described in any one of claims 1 to 8.

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