Assembling structure and assembling method of battery cell and insulating sheet

Abstract

The invention discloses an assembly structure and an assembly method of a battery cell and an insulating strip, and the assembly structure of the battery cell and the insulating strip comprises the insulating strip which is provided with a first end face, a second end face and a first through hole extending from the first end face to the second end face; the first end surface of the insulating sheet is arranged on the end surface of the electrode end of the battery cell; one end of the tab is arranged on the end face of the electrode end of the battery cell, the other end of the tab is far away from the battery cell, and the tab penetrates through the first through hole; the coating material fixes the insulating sheet on the electrode end of the battery cell, the coating material comprises a first part and a second part, the first part is arranged on the outer peripheral surface of the electrode end of the battery cell, the second part is arranged on the second end surface, and the first part is arranged on the outer peripheral surface of the electrode end of the battery cell. According to the assembly structure of the battery cell and the insulating sheet, the battery cell and the insulating sheet are fixed together, so that the safety of a battery product is improved.

Description

Technical Field

[0001] The present application is used in the field of battery production technology, and in particular relates to an assembly structure and an assembly method of a battery cell and an insulating sheet. Background Art

[0002] Lithium batteries are being used more and more widely. In the production process of lithium batteries, it is necessary to put an insulating sheet on the end face of the electrode terminal of the battery cell and fix the insulating sheet to the electrode terminal of the battery cell. However, the existing battery production process is to put the insulating sheet on the battery cell after the battery cell is inserted into the battery steel shell. With such a process, there is a risk that the electrode terminal of the battery cell will contact the steel shell and cause the battery to short-circuit. In addition, due to the gap between the battery cell and the steel shell, the electrode ear of the battery cell cannot be accurately located, which increases the difficulty of inserting the insulating sheet. The insulating sheet cannot fit tightly to the battery cell and leads to a high battery defect rate. Summary of the invention

[0003] In order to solve at least one of the above-mentioned technical problems, the present application provides an assembly structure and an assembly method of a battery cell and an insulating sheet. The assembly structure of the battery cell and the insulating sheet adds a coating process, using a coating material to fix the insulating sheet and the battery cell together, thereby improving the safety of the battery product. The technical solution adopted is as follows.

[0004] According to the first aspect of the present application, the assembly structure of the battery cell and the insulating sheet includes: An insulating sheet, the insulating sheet having a first end surface, a second end surface, and a first through hole extending from the first end surface to the second end surface; A battery cell, wherein the first end surface of the insulating sheet is placed on the end surface of the electrode terminal of the battery cell; A pole ear, one end of which is arranged on the end surface of the electrode end of the battery cell, the other end of which is away from the battery cell, and the pole ear passes through the first through hole; A coating material is provided to fix the insulating sheet to the electrode end of the battery cell. The coating material includes a first part and a second part. The first part is provided on the outer peripheral surface of the electrode end of the battery cell, and the second part is provided on the second end surface.

[0005] According to the assembly structure of the battery cell and the insulating sheet of the embodiment of the present application, at least the following beneficial effects are achieved: in the assembly structure of the battery cell and the insulating sheet, the first end face of the insulating sheet is placed on the end face of the electrode terminal of the battery cell, so that the insulating sheet is tightly fitted to the battery cell, the first part of the coating material is connected to the outer peripheral surface of the electrode terminal of the battery cell, and the second part of the coating material is connected to the second end face of the insulating sheet, that is, the insulating sheet is fixed on the end face of the electrode terminal of the battery cell by using the coating material, thereby improving the assembly accuracy of the battery cell and the insulating sheet, solving the problem of difficulty in positioning the pole ear sleeve insulating sheet after the steel shell is sleeved, and eliminating the risk of battery short circuit caused by contact between the battery cell and the steel shell in subsequent processes, thereby improving the safety of battery products.

[0006] In certain embodiments of the present application, the coating material includes a tape, and the tape includes the first part and the second part, the first part is wrapped around the circumference of the battery cell and on the outer peripheral surface of the electrode end of the battery cell, and the second part is bent and adhered to the second end surface.

[0007] In certain embodiments of the present application, the second portion is disposed along the circumference of the end surface of the electrode terminal of the battery cell, and the inner circumference of the second portion forms a second through hole for passing the electrode ear.

[0008] In some embodiments of the present application, the tab is eccentrically disposed on one side of the second through hole, and the second through hole forms a detection port on the second end surface for connecting an insulation tester. In certain embodiments of the present application, the diameter of the insulating sheet is equal to the diameter of the battery cell, and one end of the first portion facing the electrode end of the battery cell is disposed on the outer circumferential surface of the insulating sheet.

[0009] In some embodiments of the present application, the distance between one end of the electrode tab away from the battery cell and an end face of an electrode terminal of the battery cell is greater than the distance between the second end face and an end face of the electrode terminal.

[0010] According to the second aspect of the present application, the method for assembling a battery cell and an insulating sheet comprises the following steps: The first end surface of the insulating sheet faces the electrode end of the battery cell, and the insulating sheet is arranged on the end surface of the electrode end of the battery cell; Disposing the first portion of the coating material on the outer peripheral surface of the electrode end of the battery cell; The second portion of the covering material is covered on the second end surface of the insulating sheet.

[0011] In certain embodiments of the present application, before placing the insulating sheet on the end surface of the electrode terminal of the battery cell, the electrode tab is shaped so that the electrode tab extends from the first end surface to the second end surface.

[0012] In certain embodiments of the present application, before shaping the tab, the battery cell is rotated around the axial direction of the battery cell so that the tab is aligned with the second through hole.

[0013] In certain embodiments of the present application, after the insulating sheet is fixed to the end surface of the electrode terminal of the battery cell using the coating material, the second portion of the coating material is flattened on the second end surface.

[0014] The method for assembling a battery cell and an insulating sheet according to the present application has at least the following beneficial effects: the method for assembling a battery cell and an insulating sheet adds a coating step to fix the insulating sheet and the battery cell together, thereby improving the safety of the battery product and achieving high assembly efficiency.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further illustrated below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0017] Figure 1 It is a schematic diagram of the assembly structure of the battery cell and the insulating sheet in this application; Figure 2 It is a flow chart of the method for assembling battery cells and insulating sheets in the present application.

[0018] Reference numerals: Insulation sheet 100, first through hole 110; Battery cell 200; Tab 300; The covering material 400 , the first portion 410 , and the second portion 420 . DETAILED DESCRIPTION

[0019] Combine the following Figure 1 to Figure 2 The embodiments of the present application are described in detail, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the description of the present application, if there is a description with reference to the terms "one embodiment", "some embodiments", "an embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", "some examples", etc., it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0024] The embodiment of the present application provides an assembly structure of a battery cell and an insulating sheet, see Figure 1 and Figure 2, including an insulating sheet 100, a battery cell 200, a tab 300 and a coating material 400. The insulating sheet 100 has a first end face, a second end face and a first through hole 110 extending from the first end face to the second end face; the first end face of the insulating sheet 100 is placed on the end face of the electrode end of the battery cell 200; one end of the tab 300 is arranged on the end face of the electrode end of the battery cell 200, and the other end of the tab 300 is away from the battery cell 200, and the tab 300 passes through the first through hole 110; the coating material 400 fixes the insulating sheet 100 on the electrode end of the battery cell 200, and the coating material 400 includes a first part and a second part, the first part 410 is arranged on the outer peripheral surface of the electrode end of the battery cell 200, and the second part 420 is arranged on the second end face.

[0025] In the assembly structure of the battery cell and the insulating sheet, the first end face of the insulating sheet 100 is placed on the end face of the electrode terminal of the battery cell 200, so that the insulating sheet 100 is tightly fitted with the battery cell 200, the first part of the coating material 400 is connected to the outer peripheral surface of the electrode terminal of the battery cell 200, and the second part of the coating material 400 is connected to the second end face of the insulating sheet 100, that is, the insulating sheet 100 is fixed on the end face of the electrode terminal of the battery cell 200 by using the coating material 400, thereby improving the assembly accuracy of the battery cell and the insulating sheet, solving the problem of difficulty in positioning the pole ear sleeve insulating sheet after the steel shell is sleeved, and eliminating the risk of battery short circuit caused by contact between the battery cell and the steel shell in subsequent processes, thereby improving the safety of battery products.

[0026] In some of the embodiments, the coating material 400 includes a tape, which includes a first part 410 and a second part 420. The first part 410 is wrapped around the circumference of the battery cell 200 on the outer peripheral surface of the electrode end of the battery cell 200, and the second part 420 is bent and pasted on the second end surface. Specifically, the coating material 400 includes a high-temperature tape, which is pasted and used in a high-temperature working environment.

[0027] It should be noted that, in some other embodiments, the coating material 400 may include an insulating film, a first portion of the insulating film is wrapped around the outer peripheral surface of the electrode end of the battery cell 200, and a second portion of the insulating film is adhered to the second end surface by means of glue or other sticky materials; the coating material 400 may also include an elastic sleeve, a first portion of the elastic sleeve is wrapped around the outer peripheral surface of the electrode end of the battery cell 200, and a second portion of the elastic sleeve is adhered to the second end surface by means of glue or other sticky materials.

[0028] In some of the embodiments, the second portion 420 is arranged along the circumference of the end face of the electrode terminal of the battery cell 200, and the inner circumference of the second portion 420 forms a second through hole for passing through the electrode tab 300 to avoid interference between the coating material and the electrode tab. The second through hole formed on the inner circumference of the second portion 420 is an uncoated area formed at the edge of the coating material 400 on the end face of the electrode terminal of the battery cell 200.

[0029] In some of the embodiments, the pole ear 300 is eccentrically placed on one side of the second through hole, and the second through hole forms a detection port for connecting an insulation tester on the second end face, so as to facilitate insulation detection of the assembly structure of the battery cell and the insulating sheet. Specifically, the insulation tester detects the quality of the insulating sheet set online and records the NG product data online. The good products are sent to the next process through the logistics line, and the defective products are sent to the NG product buffer line by the NG discharge mechanism.

[0030] In some of the embodiments, the diameter of the insulating sheet 100 is equal to the diameter of the battery cell 200, and one end of the first part 410 facing the electrode end of the battery cell 200 is arranged on the outer peripheral surface of the insulating sheet 100, so that the coating material 400 is adhered to the outer peripheral surface and the second end surface of the insulating sheet 100, thereby increasing the contact area with the insulating sheet 100 and firmly connecting the insulating sheet 100 and the battery cell 200.

[0031] In some embodiments, the distance between one end of the tab 300 away from the battery cell 200 and the end face of the electrode terminal of the battery cell 200 is greater than the distance between the second end face and the end face of the electrode terminal. In other words, the tab 300 protrudes from the second end face.

[0032] The present application also provides an assembly method for forming the assembly structure of the battery cell and the insulating sheet in the above embodiment, comprising the following steps: The first end surface of the insulating sheet 100 faces the electrode end of the battery cell 200, and the insulating sheet 100 is disposed on the end surface of the electrode end of the battery cell 200; The first portion 410 of the coating material 400 is disposed on the outer peripheral surface of the electrode end of the battery cell 200; The second portion 420 of the coating material 400 is coated on the second end surface of the insulating sheet 100 .

[0033] The assembly method of the battery cell and the insulating sheet adds a rubber coating process for the battery cell 200, and the electrode end of the battery cell 200 is coated with a coating material 400, thereby blocking the contact between the battery cell 200 and the steel shell in subsequent processes, thereby improving the safety of the produced battery products. The assembly method of the battery cell and the insulating sheet is performed after the current collecting plate is welded and before it is inserted into the steel shell, thereby improving the qualified rate of product production and having higher production efficiency.

[0034] In some of the embodiments, before placing the insulating sheet 100 on the end face of the electrode end of the battery cell 200, the pole tab 300 is shaped so that the pole tab 300 extends from the first end face to the second end face, so that the pole tab 300 can smoothly pass through the first through hole 110 of the insulating sheet 100.

[0035] In some of the embodiments, before shaping the tab 300 , the battery cell 200 is rotated around the axis of the battery cell 200 so that the tab 300 is aligned with the second through hole, which facilitates the subsequent work of putting on the insulating sheet 100 and enables the tab 300 to smoothly pass through the first through hole 110 of the insulating sheet 100 .

[0036] In some embodiments, after the insulating sheet 100 is fixed to the end face of the electrode terminal of the battery cell using the coating material 400, the second part 420 of the coating material 400 is flattened on the second end face. The flattening process can effectively smooth the coating material 400 to fit the end face of the battery cell 200 and the insulating sheet 100, and prevent the insulating sheet 100 from being separated from the battery cell 200 during the circulation process. At the same time, it can avoid the subsequent battery cell steel shell groove rolling process, and the insulating sheet 100 is tilted and not fit the end face of the battery cell 200, thus losing the purpose of the insulating sheet covering process, which greatly reduces the risk of short circuit of the battery cell 200.

[0037] In some of the embodiments, after flattening the second part 420, the assembly structure formed by the combination of the insulating sheet 100 and the battery cell 200 is subjected to quality inspection, such as using a CCD inspection mechanism 440 to analyze the coating quality of the assembly structure of the battery cell and the insulating sheet through the camera imaging principle and record NG product data online. After the CCD inspection mechanism is completed, the battery cell 200 is moved to a subsequent workstation.

[0038] The above is a detailed description of the implementation methods of the present application in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An assembly structure of a battery cell and an insulating sheet, characterized in that: include: An insulating sheet, the insulating sheet having a first end surface, a second end surface, and a first through hole extending from the first end surface to the second end surface; A battery cell, wherein the first end surface of the insulating sheet is placed on the end surface of the electrode terminal of the battery cell; A pole ear, one end of which is arranged on the end surface of the electrode end of the battery cell, the other end of which is away from the battery cell, and the pole ear passes through the first through hole; A coating material is provided to fix the insulating sheet to the electrode end of the battery cell. The coating material includes a first part and a second part. The first part is provided on the outer peripheral surface of the electrode end of the battery cell, and the second part is provided on the second end surface.

2. The assembly structure of the battery cell and the insulating sheet according to claim 1, characterized in that: The coating material includes an adhesive tape, and the adhesive tape includes the first part and the second part. The first part is wound around the circumference of the battery cell on the outer peripheral surface of the electrode end of the battery cell, and the second part is bent and adhered to the second end surface.

3. The assembly structure of the battery cell and the insulating sheet according to claim 2, characterized in that: The second portion is arranged along the circumferential direction of the end surface of the electrode terminal of the battery cell, and a second through hole for passing the electrode lug is formed on the inner circumference of the second portion.

4. The assembly structure of the battery cell and the insulating sheet according to claim 3, characterized in that: The pole tab is eccentrically disposed on one side of the second through hole, and the second through hole forms a detection port for connecting an insulation tester on the second end surface.

5. The assembly structure of the battery cell and the insulating sheet according to claim 1, characterized in that: The diameter of the insulating sheet is equal to the diameter of the battery core, and one end of the first portion facing the electrode end of the battery core is arranged on the outer peripheral surface of the insulating sheet.

6. The assembly structure of the battery cell and the insulating sheet according to claim 1, characterized in that: The distance between one end of the electrode tab away from the battery cell and an end face of an electrode terminal of the battery cell is greater than the distance between the second end face and an end face of the electrode terminal.

7. A method for assembling a battery cell and an insulating sheet, for forming the assembly structure of the battery cell and the insulating sheet as claimed in claim 3 or 4, characterized in that The following steps are involved: The first end surface of the insulating sheet faces the electrode end of the battery cell, and the insulating sheet is arranged on the end surface of the electrode end of the battery cell; Disposing the first portion of the coating material on the outer peripheral surface of the electrode end of the battery cell; The second portion of the covering material is covered on the second end surface of the insulating sheet.

8. The method for assembling a battery cell and an insulating sheet according to claim 7, characterized in that: Before placing the insulating sheet on the end surface of the electrode terminal of the battery cell, the electrode tab is shaped so that the electrode tab extends from the first end surface to the second end surface.

9. The method for assembling a battery cell and an insulating sheet according to claim 7, characterized in that: Before shaping the tab, the battery cell is rotated around the axial direction of the battery cell so that the tab is aligned with the second through hole.

10. The method for assembling a battery cell and an insulating sheet according to claim 7, characterized in that: After the insulating sheet is fixed to the end surface of the electrode terminal of the battery cell by using the coating material, the second portion of the coating material is pressed flat on the second end surface.

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