Leading-out tab assembly structure and soft package battery

Abstract

The utility model provides a lead-out tab assembly structure and a soft package battery, the lead-out tab assembly structure comprises a battery shell, a battery cell and a lead-out tab, the battery shell is used for accommodating the battery cell; the lead-out tab is electrically connected with the battery cell and is led out through the open end of the battery shell; the battery further comprises a first top sealing area, a second top sealing area and a first tab adhesive, the first top sealing area and the second top sealing area are located at the open end of the battery shell, the first top sealing area is parallel to the second top sealing area, and the first top sealing area is close to the battery cell relative to the second top sealing area; the first tab glue is arranged in the first top sealing area; the lead-out tab is wrapped by the first tab glue, and the first top sealing area and the second top sealing area are sealed in a heat sealing manner. According to the invention, the second top sealing area is arranged and can be matched with the first top sealing area to realize two seals, and at the moment, the first tab rubber shell positioned in the first top sealing area is set as small as possible, so that the problem of stress concentration caused by an overlarge rubber overflowing block can be avoided during hot-pressing sealing, and the top sealing quality of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a lead-out tab assembly structure and a soft-pack battery. Background Technology

[0002] During the top sealing of pouch batteries, the lead-out tabs are typically welded to the tabs on the electrode sheets, then adhesive is applied, and finally, the batteries are heat-sealed with the aluminum-plastic film. When the tab adhesive, laid flat on the tab sheet, is heat-sealed with the aluminum-plastic film packaging bag, the PP layer structure inside the aluminum-plastic film and the tab adhesive melt simultaneously. The pressure generated by the upper and lower sealing heads forces the molten PP adhesive to both sides. After cooling, there will be overflow strips of adhesive on both the inner and outer sides of the seal, forming a sealed area.

[0003] An existing invention patent application with publication number CN117154173A discloses a top-sealing encapsulation method, a battery cell, and an electrical device, including the following steps: Step S1, the battery cell is installed in an aluminum-plastic film shell with an opening, the opening being surrounded by the top sealing edge of the aluminum-plastic film shell, the battery cell having a tab extending out of the opening, the top sealing edge, tab adhesive, tab, tab adhesive and the top sealing edge are stacked sequentially from top to bottom to form a component to be encapsulated, the component to be encapsulated is placed in the center of the first tab groove with the tab as the center for the first encapsulation to obtain a pre-encapsulated battery cell; Step S2, the pre-encapsulated battery cell is placed in the center of the second tab groove with the tab as the center for the second encapsulation to obtain a battery.

[0004] As described above, the single-layer adhesive used for sealing the tabs is prone to uneven adhesive overflow due to factors such as uneven sealing pressure, uneven thickness of the adhesive and the inner PP layer of the encapsulation strip, and rough surfaces. This can result in large overflow blocks in certain areas, creating stress concentrations and weak points that are susceptible to tearing. If this occurs on the inner side of the seal, the electrolyte will seep in and contact the metal layer in the middle of the encapsulation bag, creating ion channels. As the battery cell is used, the risk of electrolyte leakage increases, potentially leading to a safety accident. Therefore, to address the issue of low tab encapsulation strength and electrolyte leakage in soft-pack lithium batteries, the tab design needs to be optimized. Utility Model Content

[0005] In view of this, this utility model proposes a lead-out tab assembly structure and a soft-pack battery with high packaging strength and less prone to leakage problems, thereby solving the problem of low strength of existing tab packaging structures.

[0006] The technical solution of this utility model is implemented as follows:

[0007] On the one hand, this utility model provides a lead-out tab assembly structure, including a battery casing, a battery cell, and lead-out tabs, wherein,

[0008] The battery casing has at least one open end and is used to house the battery cell.

[0009] The lead-out tabs are electrically connected to the battery cell and led out through the open end of the battery casing;

[0010] It also includes the first top sealing area, the second top sealing area, and the first electrode tab adhesive, among which,

[0011] The first top sealing area and the second top sealing area are located at the open end of the battery casing, and the first top sealing area is parallel to the second top sealing area, with the first top sealing area being closer to the battery cell than the second top sealing area.

[0012] The first layer of tab adhesive is placed in the first top sealing area;

[0013] The first tab is wrapped with adhesive to bring out the tab, and the first and second top sealing areas are sealed by heat sealing.

[0014] Based on the above technical solutions, the preferred embodiment also includes a second tab adhesive, which is set in the second top sealing area and wraps the lead-out tab.

[0015] Based on the above technical solutions, preferably, the length of the second tab adhesive is greater than the length of the first tab adhesive.

[0016] Based on the above technical solutions, preferably, the lead-out tab is a metal sheet, and the lead-out tab is connected to the electrode tab of the battery cell.

[0017] Based on the above technical solutions, preferably, the lead-out tab is one of aluminum sheet, nickel sheet or copper-plated nickel sheet.

[0018] Based on the above technical solutions, preferably, the lead-out tab is a square sheet structure, and all four corners of the lead-out tab are rounded.

[0019] Based on the above technical solutions, preferably, the lead-out tab is a rectangular sheet structure, and a thinning area is provided on the side of the lead-out tab along its length.

[0020] On the other hand, this utility model provides a soft-pack battery, including the above-mentioned lead-out tab assembly structure.

[0021] Based on the above technical solutions, preferably, the battery casing has an open end and two lead-out tabs are provided, with the two lead-out tabs leading out through the same open end.

[0022] Based on the above technical solutions, preferably, the battery casing has two open ends and two lead-out tabs, each of which is led out through one open end.

[0023] The lead-out tab assembly structure and soft-pack battery of this utility model have the following advantages over the prior art:

[0024] (1) By setting a second top sealing area, it can work with the first top sealing area to achieve two seals. At this time, the first tab adhesive in the first top sealing area can be set as small as possible. In this way, when performing hot-press sealing, the problem of stress concentration caused by excessive adhesive overflow can be avoided, thereby improving the top sealing quality of the battery.

[0025] (2) By setting a second tab adhesive in the second top sealing area, the top sealing quality can be further guaranteed. Since the first top sealing area realizes the separation between the second top sealing area and the inside of the battery casing, the second tab adhesive can be set to be longer to ensure better sealing quality. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a perspective view of the soft-pack battery of this utility model;

[0028] Figure 2 A perspective view of the second tab adhesive layer of the soft-pack battery of this utility model;

[0029] Figure 3 This is a perspective view of the bidirectional lead-out tabs of the soft-pack battery of this utility model;

[0030] Figure 4 This is a front view of the lead-out tabs of the soft-pack battery of this utility model;

[0031] Figure 5 This is a top view of the lead-out tabs of the soft-pack battery of this utility model;

[0032] In the diagram: 1. Battery casing; 2. Battery cell; 3. Lead-out tab; 301. Thinning area; 4. First top seal area; 5. Second top seal area; 6. First tab adhesive; 7. Second tab adhesive. Detailed Implementation

[0033] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] like Figures 1-5 As shown, the lead-out tab assembly structure of this utility model includes a battery casing 1, a battery cell 2, a lead-out tab 3, a first top sealing area 4, a second top sealing area 5, a first tab adhesive 6, and a second tab adhesive 7.

[0035] The soft-pack battery of this utility model includes the above-mentioned lead-out tab assembly structure.

[0036] like Figure 1 As shown, the battery casing 1 has at least one open end, and the battery casing 1 is used to house the battery cell 2; the lead-out tab 3 is electrically connected to the battery cell 2 and is led out through the open end of the battery casing 1; the first top sealing area 4 and the second top sealing area 5 are located at the open end of the battery casing 1, and the first top sealing area 4 and the second top sealing area 5 are parallel, with the first top sealing area 4 being closer to the battery cell 2 than the second top sealing area 5; the first tab adhesive 6 is provided in the first top sealing area 4; the first tab adhesive 6 wraps the lead-out tab 3, and the first top sealing area 4 and the second top sealing area 5 are sealed by heat sealing;

[0037] As described above, during assembly, the battery cell 2 is inserted through the open end of the battery casing 1, and the electrode tabs of the battery cell 2 are connected to the lead-out tabs 3. The lead-out tabs 3 extend through the open end. After completing processes such as electrolyte injection, a first layer of tab adhesive 6 is applied, and a first top sealing area 4 is formed by hot pressing. At this time, the first layer of tab adhesive 6 melts to ensure the sealing effect. Then, hot pressing is performed again to form a second top sealing area 5, thereby fully ensuring the sealing effect.

[0038] like Figure 2 As shown, the second tab adhesive 7 is set in the second top sealing area 5, and the second tab adhesive 7 wraps the lead-out tab 3;

[0039] To further ensure sealing performance, a second tab adhesive 7 can be provided in the second top sealing area 5. After hot pressing, it forms the same structure as the first top sealing area 4 and the first tab adhesive 6, thereby achieving double sealing.

[0040] like Figure 2 As shown, the length of the second tab adhesive 7 is greater than the length of the first tab adhesive 6;

[0041] As described above, since the first top sealing area 4 isolates the inside of the battery casing 1 from the outside, the second tab adhesive 7 set in the second top sealing area 5 can be set to be longer, thereby ensuring a good sealing effect.

[0042] like Figure 3 and Figure 4 As shown, the lead-out tab 3 is a metal piece, and the lead-out tab 3 is connected to the electrode tab of the battery cell 2;

[0043] Specifically, the lead-out tab 3 is made of aluminum sheet, nickel sheet or copper-plated nickel sheet; at the same time, the lead-out tab 3 has a square sheet structure, and all four corners of the lead-out tab 3 are rounded.

[0044] Furthermore, the lead-out tab 3 is a rectangular sheet structure, and a thinning area 301 is provided on the side of the lead-out tab 3 along its length.

[0045] As described above, by setting a rounded chamfer on the edge of the lead tab 3, the problem of puncture of the lead tab 3 can be avoided. After setting the thinning area 301, it can be ensured that the lead tab 3 and the tab adhesive are tightly bonded, so as to avoid the problem of leakage caused by weak bonding at the edge due to the existence of the edge of the lead tab 3, thereby effectively improving the reliability of the application.

[0046] For pouch battery structures, they can be divided into single-ended lead-out structures and double-ended lead-out structures;

[0047] like Figure 1 and Figure 2 As shown, it is a single-ended lead-out battery structure;

[0048] Specifically, the battery casing 1 has an open end, and two lead-out tabs 3 are provided, with the two lead-out tabs 3 leading out through the same open end; one lead-out tab 3 is used as the positive terminal, and the other lead-out tab 3 is used as the negative terminal, so as to realize the connection of electrical equipment on the same side;

[0049] like Figure 3 As shown, it is a double-ended lead-out battery structure;

[0050] Specifically, the battery casing 1 has two open ends and two lead-out tabs 3 are provided, each of the two lead-out tabs 3 being led out through one open end; one lead-out tab 3 is used as the positive terminal and the other lead-out tab 3 is used as the negative terminal, so as to realize bidirectional connection of electrical equipment;

[0051] Specific implementation steps:

[0052] During assembly, the battery cell 2 is inserted through the open end of the battery casing 1, and the electrode tabs of the battery cell 2 are connected to the lead-out tabs 3, which extend out through the open end. After completing processes such as electrolyte injection, a first layer of tab adhesive 6 is applied, and a first top sealing area 4 is formed by hot pressing. At this time, the first layer of tab adhesive 6 melts to ensure a sealing effect. Then, a second hot pressing seal is performed to form a second top sealing area 5, thereby fully ensuring a sealing effect. During assembly, the battery cell 2 is inserted through the open end of the battery casing 1, and the electrode tabs of the battery cell 2 are connected to the lead-out tabs 3, which extend out through the open end. After completing processes such as electrolyte injection, a first layer of tab adhesive 6 is applied, and a first top sealing area 4 is formed by hot pressing. At this time, the first layer of tab adhesive 6 melts to ensure a sealing effect. Then, a second hot pressing seal is performed to form a second top sealing area 5, and a second layer of tab adhesive 7 is applied in the second top sealing area 5 to fully ensure a sealing effect.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lead-out tab assembly structure, comprising a battery casing (1), a battery cell (2), and lead-out tabs (3), wherein, The battery casing (1) has at least one open end, and the battery casing (1) is used to accommodate the battery cell (2); The lead-out tab (3) is electrically connected to the battery cell (2) and is led out through the open end of the battery casing (1); Its features include: a first top sealing region (4), a second top sealing region (5), and a first electrode tab adhesive (6), wherein, The first top sealing area (4) and the second top sealing area (5) are located at the open end of the battery casing (1), and the first top sealing area (4) and the second top sealing area (5) are parallel, with the first top sealing area (4) being closer to the battery cell (2) relative to the second top sealing area (5); The first tab adhesive (6) is disposed in the first top sealing area (4); The first tab adhesive (6) wraps the lead-out tab (3), and the first top sealing area (4) and the second top sealing area (5) are sealed by heat sealing. It also includes a second tab adhesive (7), which is disposed in the second top sealing area (5) and wraps the lead-out tab (3); The length of the second tab adhesive (7) is greater than the length of the first tab adhesive (6); The lead-out tab (3) is a square sheet structure, and all four corners of the lead-out tab (3) are rounded. The lead-out tab (3) is a rectangular sheet structure, and a thinning area (301) is provided on the side of the lead-out tab (3) along its length.

2. The lead-out tab assembly structure as described in claim 1, characterized in that: The lead-out tab (3) is a metal sheet, and the lead-out tab (3) is connected to the electrode tab of the battery cell (2).

3. The lead-out tab assembly structure as described in claim 1, characterized in that: The lead-out tab (3) is one of aluminum sheet, nickel sheet or copper-plated nickel sheet.

4. A soft-pack battery, characterized in that: Includes the lead-out tab assembly structure as described in any one of claims 1 to 3.

5. The soft-pack battery as described in claim 4, characterized in that: The battery casing (1) has one open end, and two lead-out tabs (3) are provided, with the two lead-out tabs (3) leading out through the same open end.

6. The soft-pack battery as described in claim 4, characterized in that: The battery casing (1) has two open ends, and two lead-out tabs (3) are provided, each of the two lead-out tabs (3) being led out through one of the open ends.

Images