Lithium ion battery pole piece before liquid injection

Abstract

The invention discloses a lithium ion battery pole piece before liquid injection, which comprises a left side electrode piece, a mounting groove, an embedding groove and a liquid injection groove, the outer surface of the left side electrode piece is provided with the mounting groove, the mounting groove is communicated with the embedding groove, the embedding groove is arranged in the middle and is matched with a coating size, the left side electrode piece is provided with an auxiliary adhesion piece and an insulation piece, and the insulation piece is arranged on the left side electrode piece. The insulating sheet is connected with a pressing sheet, the pressing sheet is connected with an anti-overflow blocking sheet, and one side face of the anti-overflow blocking sheet is evenly provided with arc-shaped protrusions. The liquid injection groove is formed between the electrode plates on the left side and the right side, the tops and the bottoms of the electrode plates on the two sides are communicated through the liquid injection groove, and the electrode plates on the two sides are fully paved with the liquid injection groove, so that an operation face with a plurality of liquid injection openings is formed in the liquid injection process, and the occupied area of electrolyte in the electrode plates can be better increased; and the electrolyte channel is kept unblocked, and the high electrical efficiency is kept at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion battery electrode sheets, and specifically relates to a lithium-ion battery electrode sheet before liquid injection. Background Art

[0002] The lithium-ion battery electrode sheet is an essential part in the process of installing a lithium-ion battery. After injecting liquid into the electrode sheets on both sides and then encapsulating them, the electrode sheets are installed at the end of the battery housing that is stacked and wrapped in multiple layers. For the traditional liquid injection of the electrode sheets, after stacking or overlapping the electrode sheets on both sides, liquid is injected into the gap. The operation surface for liquid injection is narrow, it is not easy to inject liquid without a liquid injection port, and during the liquid injection process, there are easily phenomena such as liquid ejection or uneven filling, which will lead to defective products such as unevenness and inclination after encapsulation, resulting in customer complaints.

[0003] The existing lithium-ion battery electrode sheets do not leave an operation surface or multiple liquid injection ports for liquid injection, and the surface cannot be guaranteed to be flat during the process of liquid injection and encapsulation. For example, the positive electrode sheet and lithium-ion battery disclosed in Publication No. CN109004175A use a modified substance of the positive electrode sheet to improve the thermal stability performance of the positive electrode sheet, which plays a protective role when the battery is short-circuited. However, before injecting liquid into the electrode sheet, no liquid injection port is provided, and the electrical performance of the un-injected electrode sheet is not good, and the electrode sheet that cannot provide better liquid injection conditions is also defective.

[0004] Therefore, it is very necessary to invent a lithium-ion battery electrode sheet before liquid injection to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a lithium-ion battery electrode sheet before liquid injection to solve the problems in the technology that there is no channel left for liquid injection before and after liquid injection of the lithium-ion battery electrode sheet, the channel cannot be made uniform and large-area, and the port cannot be guaranteed to be flat after liquid injection and encapsulation.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A lithium-ion battery electrode sheet before liquid injection, including a left electrode sheet, a mounting groove, an embedding groove, and a liquid injection groove. The outer surface of the left electrode sheet is provided with a mounting groove, the mounting groove is communicated with the embedding groove, the embedding groove is arranged in the middle and coincides with the coating size, an auxiliary adhesion sheet and an insulating sheet are arranged on the left electrode sheet, a pressing sheet is connected to the insulating sheet, a spill prevention baffle is connected to the pressing sheet, and arc-shaped protrusions are uniformly arranged on one side surface of the spill prevention baffle.

[0007] Preferably, a connecting non-woven fabric is connected to the left electrode sheet, a right electrode sheet is connected to the connecting non-woven fabric, a liquid injection groove is opened in the right electrode sheet, and the liquid injection groove is also opened on the inner side surface of the left electrode sheet.

[0008] Preferably, the left electrode sheet and the right electrode sheet are mirror-symmetrical and have exactly the same structure, and auxiliary adhesion sheets are connected to both the right electrode sheet and the left electrode sheet.

[0009] Preferably, the auxiliary adhesion sheet is composed of a high-temperature resistant coating, an antioxidant coating, and an adhesive layer. The high-temperature resistant coating, the antioxidant coating, and the adhesive layer are arranged in sequence from the inside to the outside, with the adhesive layer being the outermost layer. The adhesive layer can bond the electrical ear with other auxiliary adhesion sheets.

[0010] Preferably, the insulating sheet and the pressing sheet are fixedly connected, and the insulating sheet is connected to the left electrode sheet by a hot melting method.

[0011] Preferably, the pressing sheet is arc-shaped, and its length matches the width of the gap after the left electrode sheet and the right electrode sheet are fitted together.

[0012] Preferably, the anti-overflow baffle is fixedly connected to the pressing sheet, and the included angle between the pressing sheet and the anti-overflow baffle is 90°.

[0013] Preferably, the liquid injection grooves are evenly opened on the opposite inner sides of the left electrode sheet and the right electrode sheet, and the liquid injection grooves on both sides correspond to each other to form a closed electrolyte channel, and the top and the bottom are communicated.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0015] 1. By providing liquid injection grooves between the left and right electrode sheets, the liquid injection grooves connect the tops and bottoms of the two electrode sheets and cover the interiors of the two electrode sheets, so that there are multiple operating surfaces for liquid injection during the liquid injection process, and it can also better increase the occupied area of the electrolyte inside the electrode sheets. While keeping the electrolyte channel unobstructed, high electrical efficiency is maintained.

[0016] 2. By installing multiple auxiliary adhesion sheets on the two electrode sheets, the encapsulation process after liquid injection is ensured, which plays a better sealing role. During the encapsulation process, the excess electrolyte inside the two electrode sheets is squeezed, and the excess electrolyte is absorbed and processed by the anti-overflow baffle, ensuring that the ends of the two electrode sheets are smooth and flat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a three-dimensional structure diagram of the liquid injection groove of the present invention;

[0019] Figure 3 is a three-dimensional structure diagram of the auxiliary adhesion sheet of the present invention;

[0020] Figure 4 Schematic diagram of the three-dimensional structure of the left electrode sheet of the present invention;

[0021] Figure 5 Three-dimensional cross-sectional view of the auxiliary adhesion sheet of the present invention.

[0022] Explanation of reference numerals:

[0023] 1. Left electrode sheet; 2. Installation groove; 3. Embedding groove; 4. Auxiliary adhesion sheet; 401. High-temperature resistant coating; 402. Anti-oxidation coating; 403. Adhesive layer; 5. Insulating sheet; 6. Pressing sheet; 7. Anti-overflow baffle; 8. Connecting non-woven fabric; 9. Right electrode sheet; 10. Liquid injection groove. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0025] The present invention provides a Figures 1-3 lithium-ion battery electrode sheet before liquid injection as shown in the figure, including a left electrode sheet 1, an installation groove 2, an embedding groove 3 and a liquid injection groove 10. An installation groove 2 is provided on the outer surface of the left electrode sheet 1. The installation groove 2 communicates with the embedding groove 3. The embedding groove 3 is arranged in the middle and is in line with the coating size. An auxiliary adhesion sheet 4 and an insulating sheet 5 are provided on the left electrode sheet 1. A pressing sheet 6 is connected to the insulating sheet 5. An anti-overflow baffle 7 is connected to the pressing sheet 6. Arc-shaped protrusions are evenly arranged on one side surface of the anti-overflow baffle 7. A connecting non-woven fabric 8 is connected to the left electrode sheet 1. A right electrode sheet 9 is connected to the connecting non-woven fabric 8. A liquid injection groove 10 is provided inside the right electrode sheet 9. The liquid injection groove 10 is also provided on the inner side surface of the left electrode sheet 1. The liquid injection grooves 10 are evenly provided on the opposite inner side surfaces of the left electrode sheet 1 and the right electrode sheet 9, and the liquid injection grooves 10 on both sides correspond to each other to form a closed electrolyte channel, and the top and the bottom are communicated.

[0026] After the left electrode sheet 1 and the right electrode sheet 9 are close to each other, the closed channel formed by the complete liquid injection groove 10 is provided for liquid injection, providing a large working area for liquid injection, so that the liquid injection amount can cover the inside of the left electrode sheet 1 and the right electrode sheet 9 and is uniform.

[0027] The left electrode sheet 1 and the right electrode sheet 9 are mirror-symmetrical and have exactly the same structure. Auxiliary adhesion sheets 4 are connected to both the right electrode sheet 9 and the left electrode sheet 1. The auxiliary adhesion sheet 4 is composed of a high-temperature resistant coating 401, an anti-oxidation coating 402 and an adhesive layer 403. The high-temperature resistant coating 401, the anti-oxidation coating 402 and the adhesive layer 403 are arranged in sequence from the inside to the outside. The adhesive layer 403 is the outermost layer. The adhesive layer 403 can bond the electrical lugs with other auxiliary adhesion sheets 4.

[0028] During the process of relatively close engagement and encapsulation of multiple auxiliary adhesive sheets 4, the adhesive layer 403 can play a role in making the adhesion more firm. Moreover, the composite of the special material of the auxiliary adhesive sheet 4 and multiple coatings can also make the stability of the auxiliary adhesive sheet 4 higher and extend the service life.

[0029] The insulating sheet 5 and the pressing sheet 6 are fixedly connected, and the insulating sheet 5 is connected to the left electrode sheet 1 by a hot melting method. The pressing sheet 6 is arc-shaped, and its length coincides with the width of the gap after the left electrode sheet 1 and the right electrode sheet 9 are fitted. The anti-overflow baffle 7 is fixedly connected to the pressing sheet 6, and the included angle between the pressing sheet 6 and the anti-overflow baffle 7 is 90°.

[0030] After the left electrode sheet 1 and the right electrode sheet 9 are closely attached, the top gap is filled by the pressing sheet 6 and the anti-overflow baffle 7. The excess electrolyte is filled into the liquid injection grooves 10 in the entire left electrode sheet 1 and right electrode sheet 9, and at the same time, the electrolyte is absorbed by the protrusions on 7.

[0031] The working principle of the present invention:

[0032] Refer to the attached Figures 1-3 In the specification, when using the present invention, through the liquid injection grooves 10 opened on the relatively inner sides of the left electrode sheet 1 and the right electrode sheet 9, liquid injection can be carried out. The electrolyte during the liquid injection process will continuously penetrate from the top ends of the multiple liquid injection grooves 10 to the bottom ends, with a large coverage area;

[0033] Refer to the attached Figures 3-5 In the specification, when using the present invention, after the liquid injection is completed, the auxiliary adhesive sheets 4 on the left electrode sheet 1 and the right electrode sheet 9 are closely attached to play a role in encapsulation. At the same time, the pressing sheet 6 is pressed downward to continuously push the excess electrolyte downward, filling the liquid injection grooves 10, and the remaining electrolyte will be absorbed by the uniformly arranged protrusions on the anti-overflow baffle 7, evenly covering the anti-overflow baffle 7. Since the anti-overflow baffle 7 will be placed on the top end of the right electrode sheet 9 and is encapsulated by multiple auxiliary adhesive sheets 4, the excess electrolyte on the anti-overflow baffle 7 is consumed during the encapsulation process;

[0034] After the process of fitting and encapsulating multiple auxiliary adhesive sheets 4, the coating can be placed into the embedding groove 3, and the electrical lugs are installed along the installation groove 2, with the ends of the lugs exposed, which can be connected to the subsequent battery housing.

[0035] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium-ion battery electrode sheet before liquid injection, comprising a left electrode sheet (1), a mounting groove (2), an embedding groove (3) and a liquid injection groove (10), characterized in that: An installation groove (2) is formed on the outer surface of the left electrode sheet (1). The installation groove (2) communicates with an embedding groove (3). The embedding groove (3) is arranged in the middle and is in line with the coating size. An auxiliary adhesion sheet (4) and an insulating sheet (5) are arranged on the left electrode sheet (1). A pressing sheet (6) is connected to the insulating sheet (5), and an anti-overflow baffle (7) is connected to the pressing sheet (6). Arc-shaped protrusions are evenly arranged on one side surface of the anti-overflow baffle (7).

2. The lithium-ion battery electrode sheet before liquid injection according to claim 1, characterized in that: A connecting non-woven fabric (8) is connected to the left electrode sheet (1), and a right electrode sheet (9) is connected to the connecting non-woven fabric (8). A liquid injection groove (10) is formed in the right electrode sheet (9), and the liquid injection groove (10) is also formed on the inner side surface of the left electrode sheet (1).

3. A lithium-ion battery electrode sheet before liquid injection according to claim 2, characterized in that: The left electrode sheet (1) and the right electrode sheet (9) are mirror-symmetrical and have exactly the same structure. Auxiliary adhesion sheets (4) are connected to both the right electrode sheet (9) and the left electrode sheet (1).

4. A lithium-ion battery electrode sheet before liquid injection according to claim 1, characterized in that: The auxiliary adhesion sheet (4) is composed of a high-temperature resistant coating (401), an antioxidant coating (402), and an adhesive layer (403). The high-temperature resistant coating (401), the antioxidant coating (402), and the adhesive layer (403) are arranged in sequence from the inside to the outside, with the adhesive layer (403) being the outermost layer. The adhesive layer (403) can bond the electrical lugs with other auxiliary adhesion sheets (4).

5. A lithium-ion battery electrode sheet before liquid injection according to claim 1, characterized in that: The insulating sheet (5) and the pressing sheet (6) are fixedly connected, and the insulating sheet (5) is connected to the left electrode sheet (1) by hot melting.

6. The lithium-ion battery electrode sheet before liquid injection according to claim 5, characterized in that: The pressing sheet (6) is arc-shaped, and its length is in line with the gap width after the left electrode sheet (1) and the right electrode sheet (9) are fitted together.

7. The lithium-ion battery electrode sheet before liquid injection according to claim 6, characterized in that: The anti-overflow baffle (7) is fixedly connected to the pressing sheet (6), and the included angle between the pressing sheet (6) and the anti-overflow baffle (7) is 90°.

8. A lithium-ion battery electrode sheet before liquid injection according to claim 1, characterized in that: The liquid injection grooves (10) are evenly formed on the opposite inner side surfaces of the left electrode sheet (1) and the right electrode sheet (9). The liquid injection grooves (10) on both sides correspond to each other to form a closed electrolyte channel, and the top and the bottom are communicated.

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