Battery monomer and battery

Abstract

The utility model provides a battery monomer and a battery, and the battery monomer comprises a cover plate assembly which comprises a terminal assembly; the shell is matched with the cover plate assembly to form an accommodating space; the at least one electrode assembly is arranged in the accommodating space, the electrode assembly comprises a main body part and a tab extending out of the main body part, and the tab is electrically connected with the terminal assembly; the adhesive tape is arranged on the inner side, away from the shell, of the tab, and the thickness of the adhesive tape is larger than or equal to 50 micrometers and smaller than 100 micrometers. The battery monomer and the battery provided by the utility model are simple in structure, convenient to manufacture, high in space utilization rate, high in stability and good in safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology

[0002] With the continuous development of the new energy industry, higher requirements are being placed on batteries. During the manufacturing process of a battery cell, the tabs of the electrode assembly need to be welded to the terminal assembly of the cover plate assembly before the electrode assembly is cored. During cored assembly, the tabs are bent, and after being pressed down by the cover plate assembly, the tabs can easily be pressed into the main body of the electrode assembly, causing a short circuit in the battery cell or causing the tabs to be pulled and damaged. Therefore, there is an urgent need for a battery cell with stronger stability. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cell and a battery to solve the related problems mentioned in the background art.

[0004] A first aspect of this application provides a battery cell, comprising: a cover assembly including a terminal assembly; a housing cooperating with the cover assembly to form a receiving space; at least one electrode assembly disposed within the receiving space, the electrode assembly including a main body portion and a tab extending from the main body portion, the tab being electrically connected to the terminal assembly; and an adhesive tape disposed on the inner side of the tab away from the housing, the adhesive tape having a thickness greater than or equal to 50 μm and less than 100 μm.

[0005] Furthermore, the tape includes a laminated adhesive layer and a base layer, the adhesive layer being disposed on the side of the tape facing the tab, the tape being connected to the tab through the adhesive layer, and the thickness of the base layer being greater than or equal to the thickness of the adhesive layer.

[0006] Furthermore, the thickness of the adhesive layer is greater than or equal to 10 μm, and the thickness of the base layer is greater than or equal to 40 μm.

[0007] Furthermore, the thickness of the tape is greater than or equal to 60 μm and less than or equal to 95 μm.

[0008] Furthermore, the electrode tab includes a connecting portion connected to the terminal assembly, the connecting portion being fixed to the side of the terminal assembly facing the electrode assembly, and the electrode tab also includes a bent portion connecting the connecting portion and the main body portion; the tape includes a first support portion, a second support portion, and a third support portion connected in sequence, the first support portion being disposed on the side of the connecting portion facing the main body portion, at least partially covering the connecting portion, and / or covering a portion of the cover plate assembly; the second support portion being disposed on the inner side of the bent portion away from the housing, at least partially covering the bent portion; the third support portion being connected to the main body portion.

[0009] Furthermore, the battery cell includes a plurality of electrode assemblies arranged along the width direction of the cover assembly, and the tabs of the plurality of electrode assemblies of the same polarity are formed in two groups along the width direction, and the tape is provided on the inner side of each group of tabs away from the housing.

[0010] Furthermore, a fourth support portion is connected between the first support portions of the tape at the two sets of tabs of the same polarity, and the fourth support portion is disposed on the side of the terminal assembly facing the electrode assembly.

[0011] Furthermore, a soldering area is formed at the connection between the connecting portion and the terminal assembly, and the tape is connected to the connecting portion from the side of the soldering area near the electrode assembly; along the length direction of the cover plate assembly, the width of the tape is greater than or equal to the width of the soldering area.

[0012] Furthermore, the adhesive layer of the tape includes a hollow area, the hollow area at least partially covering the solder area; and / or, the adhesive layer of the tape includes a plurality of spaced adhesive blocks, with gaps formed between the plurality of adhesive blocks, the gaps at least partially covering the solder area.

[0013] A second aspect of this application provides a battery comprising a battery cell as described in the first aspect above.

[0014] As can be seen from the above description, the battery cell and battery provided in this application include: a cover assembly including a terminal assembly; a housing that cooperates with the cover assembly to form a receiving space; at least one electrode assembly disposed within the receiving space, the electrode assembly including a main body and a tab extending from the main body, the tab being electrically connected to the terminal assembly; and adhesive tape disposed on the inner side of the tab away from the housing, the thickness of the adhesive tape being greater than or equal to 50 μm and less than 100 μm. By attaching the adhesive tape to the inner side of the tab, the support effect on the tab can be improved, preventing the tab from being pressed into the main body by the cover assembly, thus avoiding short circuits in the battery cell; by limiting the thickness of the adhesive tape to greater than or equal to 50 μm and less than 100 μm, tests have shown that this thickness can ensure the support effect of the adhesive tape on the tab, while also saving internal space in the battery cell, increasing the energy density of the battery cell, and preventing the adhesive tape from tearing the separator connected to it, thus improving the structural stability of the battery cell. This battery cell and battery have a simple structure, are easy to manufacture, have high space utilization, strong stability, and good safety. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial cross-sectional schematic diagram of a battery cell in an embodiment of this application;

[0017] Figure 2 This is a cross-sectional schematic diagram of an adhesive tape according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the unfolded structure of a battery cell before assembly in an embodiment of this application;

[0019] Figure 4 for Figure 3 A magnified view of a single battery cell after the tape has been removed;

[0020] Figure 5 This is a schematic diagram of the unfolded structure of an adhesive layer in an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the unfolded structure of another adhesive layer in an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the unfolded structure of an adhesive tape according to an embodiment of this application;

[0023] Figure 8 This is a schematic diagram of the unfolded structure of another type of adhesive tape in an embodiment of this application;

[0024] Figure 9 This is a partial cross-sectional schematic diagram of another battery cell in an embodiment of this application.

[0025] Reference numerals: 1. Cover plate assembly; 1-1. Cover plate body; 1-2. Terminal assembly; 2. Housing; 3. Electrode assembly; 3-1. Main body; 3-2. Electrode tab; 3-21. Connecting part; 3-22. Bending part; 3-23. Soldering area; 4. Adhesive tape; 4-1. Adhesive layer; 4-11. Hollowed-out area; 4-12. Adhesive block; 4-2. Base layer; 4-3. First support part; 4-4. Second support part; 4-5. Third support part; 4-6. Fourth support part. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] The following describes specific embodiments in conjunction with the appendix. Figures 1 to 9 The technical solution of this application will be further described in detail.

[0029] In some embodiments of this application, a battery cell is provided, including: a cover assembly 1, including terminal assemblies 1-2; a housing 2, which cooperates with the cover assembly 1 to form a receiving space; at least one electrode assembly 3, disposed within the receiving space, the electrode assembly 3 including a main body portion 3-1 and an electrode tab 3-2 extending from the main body portion 3-1, the electrode tab 3-2 being electrically connected to the terminal assembly 1-2; and an adhesive tape 4 disposed on the inner side of the electrode tab 3-2 away from the housing 2, the adhesive tape 4 having a thickness greater than or equal to 50 μm and less than 100 μm.

[0030] like Figure 1 The diagram shows a partial cross-sectional view of a battery cell, which includes a cover assembly 1, a housing 2, and at least one electrode assembly 3. The W direction in the diagram represents the width of the cover assembly 1. The cover assembly 1 includes a cover body 1-1 and a terminal assembly 1-2 penetrating the cover body 1-1. The cover body 1-1 is, for example, an aluminum plate. The terminal assembly 1-2 includes, for example, a terminal post, and may also include an upper insulating component, a lower insulating component, a riveting component, or an adapter plate, etc., without specific limitations. The terminal assembly 1-2 is used to connect the electrode assembly 3 and external circuitry.

[0031] The housing 2 can be made of aluminum, plastic, steel, or other materials, without any specific limitation. It can be welded to the cover assembly 1. The interior of the housing 2 forms a receiving space, in which one or more electrode assemblies 3 can be placed. The electrode assembly 3 includes a connecting body 3-1 and a tab 3-2. The tab 3-2 is electrically connected to the terminal assembly 1-2 to realize current conduction.

[0032] like Figure 1As shown in the cross-section along the width direction of the cover assembly 1, the tab 3-2 has two opposing surfaces in the width direction of the cover assembly 1. One surface is closer to the housing 2 in the W direction, and correspondingly, the other surface is farther away from the housing 2 in the W direction. Adhesive tape 4 is attached to the inner side of the tab 3-2 away from the housing 2. The inner side of the tab 3-2 refers to the side of the tab 3-2 farther away from the housing 2 in the W direction. In other words, the adhesive tape 4 is located on the inner side of the tab 3-2 farther away from the housing 2 in the W direction. The tape 4 is located on the side away from the housing 2 and provides support for the tab 3-2, preventing the tab 3-2 from being pressed into the main body 3-1 by the cover assembly 1, thereby avoiding short circuits in the battery cells and preventing the tab 3-2 from being pulled and damaged. The tape 4 is located on the inner side of the tab 3-2 away from the housing 2. The tape 4 can be directly connected to the inner surface of the tab 3-2, such as the tape 4 being at least partially attached to the inner surface of the tab 3-2. Alternatively, there can be other components between the tape 4 and the inner surface of the tab 3-2, and the tape 4 provides support for the tab 3-2.

[0033] The thickness of tape 4 is greater than or equal to 50μm and less than 100μm, for example, a thickness of 50μm, 60μm, 70μm, 80μm, 90μm, or 99μm, etc., with no specific limitation. This ensures effective support for the tab 3-2 while avoiding excessively thick tape, thus saving internal space in the battery cell and improving energy density. Because tape 4 connects to the main body 3-1 when attached to the tab 3-2, it inevitably connects to the separator within the main body 3-1 as well. If tape 4 is too thick, for example, greater than or equal to 100μm, its own strength will be too high, potentially pulling up the separator connected to tape 4 during adhesion, posing a risk of separator rupture and hindering battery manufacturing. If tape 4 is too thin, for example, less than 50μm, the support for the tab 3-2 will be significantly reduced, leaving the tab 3-2 at risk of being pressed into the main body 3-1 by the cover assembly 1, and posing a short-circuit risk.

[0034] The battery cell has a simple structure, is easy to manufacture, has high space utilization, strong stability, and good safety.

[0035] In some embodiments, the tape 4 includes an adhesive layer 4-1 and a base layer 4-2 stacked together. The adhesive layer 4-1 is disposed on the side of the tape 4 facing the tab 3-2. The tape 4 is connected to the tab 3-2 through the adhesive layer 4-1. The thickness of the base layer 4-2 is greater than or equal to the thickness of the adhesive layer 4-1.

[0036] like Figure 2The diagram shows a cross-sectional view of an adhesive tape 4, which includes a laminated adhesive layer 4-1 and a base layer 4-2. The base layer 4-2 is made of materials such as polypropylene (PP), polyethylene terephthalate (PET), or thermoplastic polymers such as polystyrene (PS), polyethylene (PE), or polycarbonate (PC). The adhesive layer 4-1 is disposed on the side of the tape 4 facing the tab 3-2, and the tape 4 is connected to the tab 3-2 through the adhesive layer 4-1. The adhesive system of the tape 4 is not limited to polyacrylic acid or rubber. The adhesive layer 4-1 may include pressure-sensitive adhesives such as rubber, polyacrylate, and polyolefins.

[0037] Setting the thickness of the base layer 4-2 to be greater than or equal to the thickness of the adhesive layer 4-1 ensures the support of the tape 4 for the tabs 3-2. Additionally, if the adhesive layer 4-1 is too thick, excess adhesive may occur, hindering the unwinding of the tape 4.

[0038] In some embodiments, the thickness of the adhesive layer 4-1 is greater than or equal to 10 μm, and the thickness of the base layer 4-2 is greater than or equal to 40 μm.

[0039] The thickness of the adhesive layer 4-1 is greater than or equal to 10μm, for example, the thickness of the adhesive layer 4-1 is 10μm, 20μm or 30μm, etc., and there is no specific limitation. It can provide better adhesion and make the connection between the tape 4 and the tab 3-2 more reliable.

[0040] The thickness of the base layer 4-2 is greater than or equal to 40μm, for example, the thickness of the base layer 4-2 is 40μm, 60μm or 80μm, etc., and there is no specific limitation. This can provide better support.

[0041] In some embodiments, the thickness of the tape 4 is greater than or equal to 60 μm and less than or equal to 95 μm.

[0042] The thickness of tape 4 can be, for example, 60μm, 70μm, 80μm, 90μm, or 95μm, and is not specifically limited. Setting the thickness of tape 4 within the range of 60μm to 95μm can provide better support, offer more options for the thickness of adhesive layer 4-1 and base layer 4-2, ensure that tape 4 provides good support for tab 3-2, and also make the overall thickness of tape 4 moderate, which is convenient for manufacturing and molding.

[0043] In some embodiments, the tab 3-2 includes a connecting portion 3-21 connected to the terminal assembly 1-2, the connecting portion 3-21 being fixed to the side of the terminal assembly 1-2 facing the electrode assembly 3, and the tab 3-2 also includes a bent portion 3-22 connected between the connecting portion 3-21 and the main body portion 3-1; the tape 4 includes a first support portion 4-3, a second support portion 4-4, and a third support portion 4-5 connected in sequence, the first support portion 4-3 being disposed on the side of the connecting portion 3-21 facing the main body portion 3-1, at least partially covering the connecting portion 3-21, and / or partially covering the cover plate assembly 1; the second support portion 4-4 being disposed on the inner side of the bent portion 3-22 away from the housing 2, at least partially covering the bent portion 3-22; the third support portion 4-5 being connected to the main body portion 3-1.

[0044] like Figure 1 As shown, the tab 3-2 includes a connecting portion 3-21 and a bending portion 3-22. The connecting portion 3-21 is connected to the terminal assembly 1-2, for example, by welding, gluing, or riveting. The connecting portion 3-21 is fixed to the side of the terminal assembly 1-2 facing the electrode assembly 3, facilitating connection between the tab 3-2 and the terminal assembly 1-2. The bending portion 3-22 extends from the end face of the main body 3-1 and connects to the connecting portion 3-21 for current conduction.

[0045] like Figure 1 As shown, the tape 4 includes a first support portion 4-3, a second support portion 4-4, and a third support portion 4-5 connected in sequence. The first support portion 4-3 is located on the side of the connecting portion 3-21 facing the main body portion 3-1, at least partially covering the connecting portion 3-21 and / or partially covering the cover plate assembly 1, which can ensure the connection effect between the electrode tab 3-2 and the terminal assembly 1-2, making it difficult for the electrode tab 3-2 to separate from the terminal assembly 1-2. The second support portion 4-4 is located on the inner side of the bent portion 3-22 away from the housing 2, at least partially covering the bent portion 3-22. The second support portion 4-4 does not necessarily have to be fixedly connected to the bent portion 3-22 by adhesive or other means. The coverage here should be understood as the projection of the two partially overlapping, such as along the thickness direction of the cover plate assembly 1 or the thickness direction of the housing 2, the projection of the second support portion 4-4 and the bent portion 3-22 partially overlap. The second support part 4-4 supports the bent part 3-22, preventing the electrode tab 3-2 from being pressed into the main body part 3-1 by the cover plate assembly 1. The third support part 4-5 is provided on the main body part 3-1, partially covering the main body part 3-1, further improving the connection strength and making it difficult for the tape 4 to separate from the electrode assembly 3.

[0046] like Figure 3 The diagram shows an unfolded structure of a battery cell, where direction L represents the length of the cover assembly 1. The third support portion 4-5 includes a first part disposed on the end face of the main body portion 3-1; this end face can be... Figure 3The main body 3-1 has one surface along the width direction W of the cover plate assembly 1. This arrangement ensures the connection strength of the tape 4. For example... Figure 3 As shown, the third support part 4-5 may also include a second part disposed on the side of the main body part 3-1. The side here may be a surface on the main body part 3-1 adjacent to the end face, so as to further enhance the connection effect of the tape 4.

[0047] In some embodiments, the battery cell includes a plurality of electrode assemblies 3 arranged along the width direction of the cover assembly 1, and the electrode tabs 3-2 of the same polarity of the plurality of electrode assemblies 3 are formed in two groups along the width direction of the cover assembly 1, and each group of electrode tabs 3-2 is provided with an adhesive tape 4 on the inner side away from the housing 2.

[0048] like Figure 9 As shown, the battery cell includes multiple electrode assemblies 3 arranged along the width direction of the cover assembly 1. The multiple electrode assemblies 3 can improve the battery energy density and increase the space utilization of the battery cell. Each electrode assembly 3 includes a positive electrode tab and a negative electrode tab. The tabs 3-2 of the same polarity of the multiple electrode assemblies 3 form two groups along the width direction of the cover assembly 1. Each group of tabs 3-2 can include one type of tab 3-2 from one electrode assembly 3, or it can include tabs 3-2 of the same polarity from multiple electrode assemblies 3. This facilitates the connection of the tabs 3-2 to the terminal assembly 1-2, eliminating the need to connect the tabs 3-2 of each electrode assembly 3 to the terminal assembly 1-2 separately, saving time and simplifying manufacturing. Figure 1 and Figure 9 Understandably, along the width direction of cover plate assembly 1, i.e. Figure 1 and Figure 9 In the W direction, the tabs 3-2 of the same polarity of multiple electrode components 3 form two groups respectively. For example, when there are two electrode components 3, then... Figure 9 The tabs 3-2 in the diagram represent tabs 3-2 of the same polarity in one of the electrode components 3; when there are four electrode components 3, then... Figure 9The tabs 3-2 in the diagram should be understood as two sets of tabs 3-2 of the same polarity formed by the four electrode components 3 in the width direction of the cover plate assembly 1. These two sets of tabs 3-2 can be formed by tabs 3-2 of the same polarity from two electrode components 3 respectively, or one tab 3-2 can represent the tab 3-2 of one electrode component 3, and the other tab 3-2 can represent the tabs 3-2 of the same polarity from the other three electrode components 3. When there are three, five, six, or other electrode components 3, the formation of the two sets of tabs 3-2 can also be understood in the same way. When the number of multiple electrode components 3 is an even number greater than 0, the two sets of tabs 3-2 can be formed by tabs 3-2 of half the total number of electrode components 3. In this case, the structure is more symmetrical, which helps to save internal space of the battery cell, improve performance, and facilitate manufacturing.

[0049] Along the width of the cover plate assembly 1, each set of tabs 3-2 has adhesive tape 4 attached to its inner side away from the housing 2. This provides better protection for each set of tabs 3-2 and ensures structural stability. The adhesive tape 4 at the two sets of tabs 3-2 can be set independently or integrally formed, or the adhesive tape 4 at the two sets of tabs 3-2 can be connected as a whole. There is no specific limitation.

[0050] In some embodiments, a fourth support 4-6 is connected between the first support portion 4-3 of the tape 4 at two sets of tabs 3-2 of the same polarity, and the fourth support portion 4-6 is disposed on the side of the terminal assembly 1-2 facing the electrode assembly 3.

[0051] like Figure 9 As shown, the tape 4 at the two sets of tabs 3-2 is connected by a fourth support 4-6. The fourth support 4-6 can be integrally formed with the first support 4-3 of the corresponding tape 4. That is, a single tape 4 is used to simultaneously attach the tabs 3-2 of the same polarity of the two sets of electrode assemblies 3. This structure is simpler, eliminating the need to individually attach the tabs 3-2 of each set of electrode assemblies 3, thus improving manufacturing efficiency. The fourth support 4-6 is located on the side of the terminal assembly 1-2 facing the electrode assembly 3, which can further improve the support effect on the tabs 3-2.

[0052] In some embodiments, a soldering area 3-23 is formed at the connection between the connecting portion 3-21 and the terminal assembly 1-2. For example, in some embodiments, the terminal assembly 1-2 further includes an adapter piece, and the soldering area 3-23 is formed by connecting the connecting portion 3-21 and the adapter piece in the terminal assembly 1-2. In other embodiments, the soldering area 3-23 may also be formed by connecting the connecting portion 3-21 and the electrode post in the terminal assembly 1-2. The tape 4 is connected to the connecting portion 3-21 from the side of the soldering area 3-23 near the electrode assembly 3. Along the length direction of the cover plate assembly 1, the width of the tape 4 is greater than or equal to the width of the soldering area 3-23.

[0053] like Figure 4 As shown, Figure 3 An enlarged schematic diagram of the battery cell after removing tape 4 shows that the connecting portion 3-21 of the electrode tab 3-2 is welded to the terminal assembly 1-2, for example, using ultrasonic welding, friction welding, laser welding, etc., forming a solder area 3-23 at the connection. The shape of the solder area 3-23 is not limited, for example, rectangular, elliptical, triangular, straight, or curved. Tape 4 connects to the connecting portion 3-21 from the side of the solder area 3-23 closest to the electrode assembly 3, preventing the connecting portion 3-21 from separating from the terminal assembly 1-2. Figure 3 As shown, the width of the tape 4 is W3 along the length of the cover plate assembly 1. Figure 4 As shown, the width of the solder area 3-23 is W1. Setting W3 ≥ W1, i.e., covering the solder area 3-23 with tape 4, prevents debris or metal shavings from falling into the electrode assembly 3 during the soldering process, puncturing the diaphragm, or causing an internal short circuit. The width W3 of the tape 4 is greater than or equal to the width W1 of the solder area 3-23 to prevent burrs on the edges of the solder area 3-23 from scratching the electrode assembly 3.

[0054] like Figure 4 As shown, the width of the tab 3-2 is W2. Based on the setting W3 > W1, W3 ≥ W2 can be set, that is, tape 4 is set to cover the tab 3-2. This can provide better support, make the tab 3-2 more evenly stressed, and reduce the risk of short circuit caused by direct contact between the tab 3-2 and the side wall of the housing 2.

[0055] In some embodiments, the adhesive layer 4-1 of the tape 4 includes a cutout area 4-11, which at least partially covers the soldering area 3-23; and / or, the adhesive layer 4-1 of the tape 4 includes a plurality of adhesive blocks 4-12 spaced apart, with a gap formed between the plurality of adhesive blocks 4-12, and the gap at least partially covering the soldering area 3-23.

[0056] like Figure 5The diagram shows an unfolded structure of the adhesive layer 4-1 of an adhesive tape 4. The adhesive layer 4-1 has a hollow area 4-11, the shape of which is, for example, rectangular, etc., and is not specifically limited. The adhesive tape 4 in a battery cell is generally colored to identify its placement. However, after the tab 3-2 is soldered to the terminal assembly 1-2, it is usually necessary to check whether the formed solder area 3-23 is complete. The colored adhesive tape 4 can hinder this check. The color of the adhesive tape 4 is mainly determined by the adhesive layer 4-1, which is typically blue, yellow, green, etc. Therefore, the portion of the adhesive tape 4 with the adhesive layer 4-1 will also display the corresponding color. By setting a hollow area 4-11 in the adhesive layer 4-1 to at least partially cover the solder area 3-23, the solder area 3-23 can at least partially overlap with the hollow area 4-11. Since the base layer 4-2 of the adhesive tape 4 is usually highly transparent, this embodiment facilitates the inspection of the morphology of the solder area 3-23. In some embodiments, a structure containing... Figure 5 Specifically, the adhesive tape 4 shown has adhesive layers at both ends, so that the two ends of the tape 4 are respectively set on the main body 3-1 and the connecting part 3-21. The soldering area 3-23 can fall completely into the hollow area 4-11 to inspect the complete shape of the soldering area 3-23, ensuring the quality of the battery cell. At the same time, it is convenient to ensure the positional relationship between the tape 4 and other structures in the battery cell during the processing and manufacturing process. Furthermore, the hollow area 4-11 is only set in the adhesive layer 4-1, while the base layer 4-2 of the tape 4 maintains its complete structure. This ensures the connection and support effect of the tape 4 to the tab 3-2.

[0057] like Figure 6 The diagram shows the unfolded structure of the adhesive layer 4-1 of another type of tape 4. The cutout area 4-11 can be set to extend along the length of the cover plate assembly 1 to the opposite ends of the tape 4, which is easier to manufacture. Furthermore, the cutout area 4-11 can not only at least partially cover the soldering area 3-23, but the size of the cutout area 4-11 in the width direction of the cover plate assembly 1 can also be adjusted, without any specific limitation. In some embodiments, the hollow area 4-11 may at least partially cover the bent portion 3-22, so as to form a situation in some embodiments where the tape 4 and the tab 3-2 are not fixedly connected, but the projected portions overlap. The specific situation is not limited. This can achieve the effect of tape 4 supporting tab 3-2, and also facilitate further inspection of the morphology of other areas. At the same time, compared with the embodiment where the adhesive layer 4-1 completely covers the base layer 4-2, the area where tape 4 and tab 3-2 are connected is reduced due to the presence of hollow area 4-11, which reduces the pulling of tape 4 on tab 3-2 during the manufacturing, transportation, and use of battery cells, and reduces the risk of tab 3-2 tearing.

[0058] The adhesive layer 4-1 of the tape 4 may also include multiple adhesive blocks 4-12 spaced apart. The specific shape of the adhesive blocks 4-12 is not limited, such as... Figure 7 The diagram shows an unfolded structure of an adhesive tape 4, where the adhesive blocks 4-12 are rectangular in shape. The number of adhesive blocks 4-12 on the tape 4 is not particularly limited; it can be two, three, four, etc. Spacing areas are formed between the spaced adhesive blocks 4-12, and the width and area of ​​each block do not need to be identical. Figure 7 The image shows one embodiment where five adhesive blocks 4-12 are arranged on the tape 4. Figure 8 The diagram shows another unfolded structure of the adhesive tape 4, where the adhesive block 4-12 is circular. Setting multiple spaced adhesive blocks 4-12 can reduce the amount of adhesive layer 4-1 used, saving manufacturing costs. The aforementioned partial coverage of the soldering area 3-23 can also be achieved at the intervals of the adhesive blocks 4-12. The intervals between the adhesive blocks 4-12 can be understood as the adhesive tape 4 in these intervals not being adhesive. For example, no adhesive layer 4-1 can be set in the intervals, or other structures can be added to the adhesive layer 4-1 to cover the intervals, so that the adhesive tape 4 corresponding to the intervals is not adhesive on the side facing the tab 3-2. The intervals can also be set in a manner similar to the aforementioned hollowed-out area 4-11, at least partially covering the soldering area 3-23, to facilitate the inspection of the morphology of the soldering area 3-23.

[0059] Example 1

[0060] A battery cell includes a cover assembly 1, a housing 2, and two electrode assemblies 3. The tabs 3-2 of the electrode assemblies 3 are bonded to the inner side of the housing 2 with adhesive tape 4, the total thickness of which is 98 μm. The adhesive tape 4 includes a base layer 4-2 and an adhesive layer 4-1 stacked together. The base layer 4-2 is made of PET and has a thickness of 65 μm, while the adhesive layer 4-1 is made of acrylic adhesive and has a thickness of 33 μm.

[0061] Example 2

[0062] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 95 μm, the thickness of the base layer 4-2 is 63 μm, and the thickness of the adhesive layer 4-1 is 32 μm.

[0063] Example 3

[0064] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 95 μm, the thickness of the base layer 4-2 is 55 μm, and the thickness of the adhesive layer 4-1 is 40 μm.

[0065] Example 4

[0066] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 95 μm, the thickness of the base layer 4-2 is 50 μm, and the thickness of the adhesive layer 4-1 is 45 μm.

[0067] Example 5

[0068] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 90 μm, the thickness of the base layer 4-2 is 70 μm, and the thickness of the adhesive layer 4-1 is 20 μm.

[0069] Example 6

[0070] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 90 μm, the thickness of the base layer 4-2 is 45 μm, and the thickness of the adhesive layer 4-1 is 45 μm.

[0071] Example 7

[0072] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 85 μm, the thickness of the base layer 4-2 is 55 μm, and the thickness of the adhesive layer 4-1 is 30 μm.

[0073] Example 8

[0074] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 85 μm, the thickness of the base layer 4-2 is 40 μm, and the thickness of the adhesive layer 4-1 is 45 μm.

[0075] Example 9

[0076] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 80 μm, the thickness of the base layer 4-2 is 60 μm, and the thickness of the adhesive layer 4-1 is 20 μm.

[0077] Example 10

[0078] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 65 μm, the thickness of the base layer 4-2 is 48 μm, and the thickness of the adhesive layer 4-1 is 17 μm.

[0079] Example 11

[0080] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 65 μm, the thickness of the base layer 4-2 is 40 μm, and the thickness of the adhesive layer 4-1 is 25 μm.

[0081] Example 12

[0082] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 60 μm, the thickness of the base layer 4-2 is 36 μm, and the thickness of the adhesive layer 4-1 is 24 μm.

[0083] Example 13

[0084] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 60 μm, the thickness of the base layer 4-2 is 30 μm, and the thickness of the adhesive layer 4-1 is 30 μm.

[0085] Example 14

[0086] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 60 μm, the thickness of the base layer 4-2 is 30 μm, and the thickness of the adhesive layer 4-1 is 30 μm.

[0087] Example 15

[0088] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 55 μm, the thickness of the base layer 4-2 is 43 μm, and the thickness of the adhesive layer 4-1 is 12 μm.

[0089] Example 16

[0090] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 55 μm, the thickness of the base layer 4-2 is 35 μm, and the thickness of the adhesive layer 4-1 is 20 μm.

[0091] Example 17

[0092] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 55 μm, the thickness of the base layer 4-2 is 32 μm, and the thickness of the adhesive layer 4-1 is 23 μm.

[0093] Example 18

[0094] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 50 μm, the thickness of the base layer 4-2 is 40 μm, and the thickness of the adhesive layer 4-1 is 10 μm.

[0095] Example 19

[0096] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 50 μm, the thickness of the base layer 4-2 is 25 μm, and the thickness of the adhesive layer 4-1 is 25 μm.

[0097] Comparative Example 1

[0098] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 100 μm, the thickness of the base layer 4-2 is 70 μm, and the thickness of the adhesive layer 4-1 is 30 μm.

[0099] Comparative Example 2

[0100] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 120 μm, the thickness of the base layer 4-2 is 80 μm, and the thickness of the adhesive layer 4-1 is 40 μm.

[0101] Comparative Example 3

[0102] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 45 μm, the thickness of the base layer 4-2 is 35 μm, and the thickness of the adhesive layer 4-1 is 10 μm.

[0103] Comparative Example 4

[0104] A battery cell with the structure shown in Example 1, except that the total thickness of the adhesive tape 4 is 30 μm, the thickness of the base layer 4-2 is 20 μm, and the thickness of the adhesive layer 4-1 is 10 μm.

[0105] 1000 battery cells were fabricated according to the structures of Examples 1 to 19 and Comparative Examples 1 to 4 respectively. The number of battery cells in each group that failed due to the tab 3-2 tearing or the tab 3-2 being inserted into the main body 3-1 was tested. The test results are shown in Table 1.

[0106] As shown in Table 1, when the total thickness of tape 4 is greater than or equal to 50 μm and less than 100 μm, tape 4 provides good support for the tabs 3-2, resulting in stronger stability of the battery cells. When the total thickness of tape 4 is greater than or equal to 100 μm, some battery cells experience tape tearing of the separator. When the total thickness of tape 4 is less than 50 μm, the tabs 3-2 are particularly prone to inserting into the main body 3-1. When the total thickness of tape 4 is greater than or equal to 60 μm and less than or equal to 95 μm, the stability of the battery cells is even higher.

[0107] Furthermore, when the thickness of the base layer 4-2 is greater than or equal to 40 μm and the thickness of the adhesive layer 4-1 is greater than or equal to 10 μm, the support effect of the tape 4 is better. The support effect of the tape 4 is even better when the thickness of the base layer 4-2 is greater than the thickness of the adhesive layer 4-1. As shown in Example 8, although the number of failed battery cells is 0, the tape has some excess adhesive and pinhole defects.

[0108] Table 1 Battery Cell Test Table

[0109]

[0110] In some embodiments of this application, a battery is provided, comprising a battery cell as described in any of the above embodiments.

[0111] Batteries comprise one or more individual battery cells and can be used in electrical devices, such as vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0112] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0113] Furthermore, given that details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0114] Although this application has been described in conjunction with embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0115] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: Cover assembly, including terminal assembly; The housing, in conjunction with the cover plate assembly, forms an accommodating space; At least one electrode assembly is disposed within the receiving space, the electrode assembly including a main body and a tab extending from the main body, the tab being electrically connected to the terminal assembly; An adhesive tape is disposed on the inner side of the tab away from the housing, and the thickness of the adhesive tape is greater than or equal to 50 μm and less than 100 μm.

2. The battery cell according to claim 1, characterized in that, The tape includes a laminated adhesive layer and a base layer. The adhesive layer is disposed on the side of the tape facing the tab. The tape is connected to the tab through the adhesive layer. The thickness of the base layer is greater than or equal to the thickness of the adhesive layer.

3. The battery cell according to claim 2, characterized in that, The thickness of the adhesive layer is greater than or equal to 10 μm, and the thickness of the base layer is greater than or equal to 40 μm.

4. The battery cell according to claim 1, characterized in that, The thickness of the tape is greater than or equal to 60 μm and less than or equal to 95 μm.

5. The battery cell according to claim 1, characterized in that, The electrode tab includes a connecting portion connected to the terminal assembly, the connecting portion being fixed to the side of the terminal assembly facing the electrode assembly, and the electrode tab also includes a bent portion connecting the connecting portion and the main body portion; The tape includes a first support portion, a second support portion, and a third support portion connected in sequence. The first support portion is disposed on the side of the connecting portion facing the main body portion, and at least partially covers the connecting portion and / or covers a portion of the cover plate assembly. The second support portion is disposed on the inner side of the bending portion away from the housing, and at least partially covers the bending portion. The third support portion is connected to the main body portion.

6. The battery cell according to claim 5, characterized in that, The battery cell includes a plurality of electrode assemblies arranged along the width direction of the cover plate assembly, and the electrode tabs of the plurality of electrode assemblies of the same polarity are formed in two groups along the width direction, and the tape is provided on the inner side of each group of electrode tabs away from the housing.

7. The battery cell according to claim 6, characterized in that, A fourth support is connected between the first support portions of the tape at the two sets of tabs of the same polarity, and the fourth support portion is disposed on the side of the terminal assembly facing the electrode assembly.

8. The battery cell according to claim 5, characterized in that, The connection between the connecting portion and the terminal assembly forms a soldering area, and the tape is connected to the connecting portion from the side of the soldering area near the electrode assembly; along the length direction of the cover plate assembly, the width of the tape is greater than or equal to the width of the soldering area.

9. The battery cell according to claim 8, characterized in that, The adhesive layer of the tape includes a hollow area, which at least partially covers the solder area; And / or, the adhesive layer of the tape includes a plurality of spaced adhesive blocks, with gaps formed between the plurality of adhesive blocks, the gaps at least partially covering the solder area.

10. A battery, characterized in that, Includes the battery cell described in any one of claims 1-9.

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