Battery cell structure and secondary battery

Abstract

The utility model belongs to battery technical field, concretely relates to a kind of electric core structure and secondary battery, wherein, electric core structure includes electric core body and clamping reinforcing component;Electric core body includes encapsulation film and the bare electric core housed in encapsulation film inside;Encapsulation film includes main part and edge portion, and bare electric core is set in main part, and main part includes top wall, and edge portion includes top edge, and top edge is connected in top wall;Pole lug body is equipped on bare electric core;Pole lug body includes the connection area, encapsulation area and exposed area connected in proper order;Connection area is connected in bare electric core;Encapsulation area is located in top edge, and exposed area extends out encapsulation film from the end of top edge away from main part;Clamping reinforcing component is used to clamp pole lug body;Clamping reinforcing component is equipped with clamping cavity;At least part of structure on encapsulation area and / or exposed area is set in the inside of clamping cavity.The utility model can improve the impact resistance of battery packaging area;Further improve the security and reliability of use.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a cell structure and a secondary battery. Background Technology

[0002] Soft-pack prismatic cells have become widely used as a novel battery structure. However, during transportation and use, especially when subjected to drops or impacts, the tension of the tabs under external forces can pose potential safety hazards to the battery's encapsulation area. Its safety, particularly the impact resistance of the encapsulation area, has become a key research focus. The roller drop test, a common battery safety testing method, primarily simulates the impacts and drops that batteries may encounter during transportation, verifying whether the battery can maintain its seal and internal safety.

[0003] Currently, the packaging technology for pouch cells mainly relies on sealing films and heat-sealing processes. However, the main problem with this packaging technology is that the heat-sealing film is not strong enough to withstand the severe impacts or pulling that the battery may encounter during a drop, causing the sealing film to crack or detach, ultimately leading to packaging failure. Therefore, when faced with external impacts, the mechanical effects of the tabs pulling often damage the packaging area, leading to problems such as electrolyte leakage and internal short circuits; this reduces the safety and reliability of the battery. Utility Model Content

[0004] The purpose of this utility model is to provide a cell structure that addresses the shortcomings of existing technologies and solves the technical problem that the sealed area of ​​batteries is damaged due to the pulling of the tabs during drops.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery cell structure includes a battery cell body and a clamping and reinforcing component; the battery cell body includes an encapsulation film and a bare battery cell housed inside the encapsulation film; the encapsulation film includes a main body portion and a sealing edge portion, the bare battery cell is disposed within the main body portion, the main body portion includes a top wall, the sealing edge portion includes a top sealing edge, and the top sealing edge is connected to the top wall; the bare battery cell is provided with a tab; the tab includes a connection area, an encapsulation area, and an exposed area connected in sequence; the connection area is connected to the bare battery cell; the encapsulation area is located within the top sealing edge, and the exposed area extends from the end of the top sealing edge away from the main body portion out of the encapsulation film; the clamping and reinforcing component is used to clamp the tab; the clamping and reinforcing component is provided with a clamping cavity; at least a portion of the structure on the encapsulation area and / or the exposed area is disposed inside the clamping cavity.

[0007] Preferably, the clamping and reinforcing component includes a first clamping body and a second clamping body; the first clamping body and the second clamping body are disposed opposite to each other, and the clamping cavity is formed between the first clamping body and the second clamping body; the first clamping body is connected to the encapsulation film, and one end of the first clamping body facing the main body is disposed above the top wall; the second clamping body is connected to the encapsulation film, and one end of the second clamping body facing the main body is disposed above the top wall.

[0008] Preferably, the first clamping body abuts against the top wall at one end facing the main body, and the second clamping body abuts against the top wall at one end facing the main body.

[0009] Preferably, the first clamping body includes a first metal sheet and a first sealing sheet stacked together; the first sealing sheet is disposed inside the clamping cavity; and the first sealing sheet abuts against the tab body on the inner surface of the clamping cavity; the first sealing sheet abuts against the encapsulation film on the inner surface of the clamping cavity.

[0010] And / or, the second clamping body includes a second metal sheet and a second sealing sheet stacked together; the second sealing sheet is disposed inside the clamping cavity; and the second sealing sheet abuts against the tab body on the inner surface of the clamping cavity; the second sealing sheet abuts against the encapsulation film on the inner surface of the clamping cavity.

[0011] Preferably, the relationship between the thickness L3 of the tab and the thickness L1 of the second metal sheet or the second metal sheet at the position of the encapsulation film satisfies: L3 = L1 * A;

[0012] Where A is 1 / 8 to 1 / 4.

[0013] Preferably, the clamping and reinforcing component further includes at least one reinforcing member, which is disposed inside the clamping cavity, and the two ends of the reinforcing member are respectively connected to the first clamping body and the second clamping body;

[0014] The first clamping body is provided with a first fixing hole; one end of the reinforcing member is connected to the first fixing hole;

[0015] And / or, the second clamping body is provided with a second fixing hole; the other end of the reinforcing member is connected to the second fixing hole.

[0016] Preferably, the first clamping body is connected to the top sealing edge, the second clamping body is connected to the top sealing edge, and the surface of the first clamping body facing the second clamping body is provided with a first reinforcing groove; the end of the top sealing edge facing the tab is connected to the inner wall of the first reinforcing groove.

[0017] And / or, the second clamping body has a second reinforcing groove on one side surface facing the first clamping body; the top sealing edge is connected to the inner wall of the second reinforcing groove at one end facing the tab body.

[0018] Preferably, the side surface of the first clamping body facing the second clamping body is also connected to the exposed area;

[0019] And / or, the side surface of the second clamping body facing the first clamping body is also connected to the exposed area.

[0020] Preferably, the clamping cavity is provided with a filler, and the side surface of the filler is respectively connected to the inner surface of the first clamping body, the inner surface of the second clamping body and the outer surface of the tab body;

[0021] The filler is polypropylene or polycarbonate.

[0022] This utility model also discloses a secondary battery, including the aforementioned cell structure.

[0023] The beneficial effects of this utility model are that, by using a clamping and reinforcing component to fix and assemble the outer encapsulation film and the inner bare cell, combined with the clamping cavity inside the clamping and reinforcing component to clamp and reinforce the tab, the tab of the bare cell is reinforced to prevent the tensile stress generated during the collision from damaging the structure at the corresponding position; thereby reducing the risk of cracking and improving the impact resistance of the battery; and thus improving the safety and reliability of use. Attached Figure Description

[0024] The following will refer to the appendix. Figures 1-4 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0025] Figure 1 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the clamping and reinforcing component of a battery cell structure according to an embodiment of the present invention;

[0027] Figure 3 This is a side view of a battery cell structure according to an embodiment of the present invention;

[0028] Figure 4 This is a side view of the clamping and reinforcing component of a battery cell structure according to an embodiment of the present invention.

[0029] In the diagram: 100-cell body; 110-tab body; 111-tab sheet; 112-insulating separator; 113-exposed area; 114-encapsulation area; 115-connection area; 120-bare cell; 130-encapsulation film; 131-sealing edge; 132-main body; 133-top wall; 134-top sealing edge; 200-clamping and reinforcing component; 201-clamping cavity; 202-first reinforcing groove; 203-second reinforcing groove; 210-first clamping body; 211-first metal sheet; 212-first sealing sheet; 213-first fixing hole; 214-second fixing hole; 220-second clamping body; 221-second metal sheet; 222-second sealing sheet; 230-reinforcing component; 240-filler; 251-first fastener; 252-second fastener. Detailed Implementation

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is intended to particularly describe embodiments and not to limit the scope of this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the embodiment description, "multiple" refers to two or more, unless otherwise specifically defined.

[0032] The term 'embodiment' means that a particular feature, structure, or characteristic described exists in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can also refer to a mechanical connection or an electrical connection. They can be directly connected or indirectly connected through an intermediate medium, manifesting as internal communication between two components or an interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0036] like Figure 1 As shown, in one embodiment of this utility model, the battery cell structure includes a battery cell body 100 and a clamping and reinforcing component 200. The battery cell body 100 includes an encapsulation film 130 and a bare battery cell 120 housed inside the encapsulation film 130. A tab 110 is provided on the bare battery cell 120. The encapsulation film 130 includes a main body portion 132 and a sealing edge portion 131. The bare battery cell is disposed within the main body portion 132. The main body portion 132 includes a top wall 133, and the sealing edge portion 131 includes a top sealing edge 134 connected to the top wall 133. The tab 110... 110 includes a connection area 115, an encapsulation area 114, and an exposed area 113 connected in sequence; the connection area 115 is connected to the cell body 110; the encapsulation area 114 is located within the top sealing edge 134, and the exposed area 113 extends from the end of the top sealing edge 134 away from the main body 132, extending out of the encapsulation film 130; a clamping and reinforcing component 200 is used to clamp the tab body 110; the clamping and reinforcing component 200 is provided with a clamping cavity 201; at least a portion of the structure on the encapsulation area 114 and / or the exposed area 113 is disposed inside the clamping cavity 201. In some embodiments, such as... Figure 1 and 3 As shown, the tab body 110 includes a tab piece 111 and an insulating separator 112 connected to at least one side surface of the tab piece 111; the insulating separator 112 is connected to the bare cell 120 on the side facing the cell body 100.

[0037] The technical solution of this utility model uses a clamping and reinforcing component to fix and assemble the outer encapsulation film and the inner bare cell. Combined with the clamping cavity inside the clamping and reinforcing component, the tab of the bare cell is clamped and reinforced to prevent the tensile stress generated during the collision from damaging the structure at the corresponding position. This reduces the risk of cracking and improves the impact resistance of the battery, thereby improving the safety and reliability of use.

[0038] Specifically, in some implementations, such as Figure 1 and 2 As shown, the clamping and reinforcing component 200 includes a first clamping body 210 and a second clamping body 220; the first clamping body 210 and the second clamping body 220 are disposed opposite to each other, and a clamping cavity 201 is formed between the first clamping body 210 and the second clamping body 220; the first clamping body 210 is connected to the encapsulation film 130; the second clamping body 220 is connected to the encapsulation film 130 (middle sealing portion 131) and is disposed above the bare battery cell 120; and the tab body 110 is disposed inside the clamping cavity 201; the tab body 110 is connected to the first clamping body 210 and / or the second clamping body 220. The first clamping body 210 abuts against the top wall 133 at one end facing the main body portion 132, and the second clamping body 220 abuts against the top wall 133 at one end facing the main body portion 132. This structure employs a first clamping body and a second clamping body, both assembled to the top of the battery cell body. The parallel clamping and reinforcement of the first and second clamping bodies strengthen the top sealing area of ​​the battery cell body's tab, preventing tensile stress generated during impact from damaging the structure of the top sealing area. This reduces the risk of encapsulation cracking and improves the impact resistance of the battery encapsulation area, thereby enhancing safety and reliability. The "top" refers to the direction on the same side as the tab 110.

[0039] The bare cell 120 includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector can be made of aluminum, and the active material layer includes a positive active material, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode includes a negative current collector and a negative active material layer, the latter coated on the surface of the current collector. The current collector can be made of copper, and the active material layer includes a negative active material, such as carbon or silicon. The separator can be made of PP (polypropylene) or PE (polyethylene).

[0040] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figure 3, the inner surface of the first clamping body 210 facing the second clamping body 220 abuts against one side surface of the insulating separator 112 in the tab body 110; this structure reduces the complexity of the assembly operation and ensures the stability of the assembly through the abutment assembly of the first clamping body 210.

[0041] Specifically, in some implementations, such as Figure 1 , 2As shown in Figure 3, the inner surface of the second clamping body 220 facing the first clamping body 210 abuts against one side surface of the insulating separator 112 in the tab body 110. This structure reduces the complexity of the assembly operation and ensures the stability of the assembly through the abutment assembly of the second clamping body 220. The side surface of the first clamping body 210 facing the second clamping body 220 is also connected to the exposed area 113; and / or, the side surface of the second clamping body 220 facing the first clamping body 210 is also connected to the exposed area 113.

[0042] Furthermore, in some implementations, such as Figure 3 As shown, the first clamping body 210 abuts against the insulating separator 112 on one side surface of the tab body 110; at the same time, the second clamping body 220 also abuts against the insulating separator 112 on the other side surface of the tab body 110; through the abutting and clamping action of the second clamping body 220 and the first clamping body 210 from both sides of the different insulating separators 112 in the tab body 110, the complexity of the assembly operation is reduced, and the assembly stability can be further improved; it can also solve the problem of seal damage caused by the tab pulling during battery drop.

[0043] Specifically, in some implementations, such as Figure 1 and 4 As shown, the first clamping body 210 has a first reinforcing groove 202 on its surface facing the second clamping body 220; the end of the encapsulation film 130 facing the tab body 100 is tightly abutted against the inner wall of the first reinforcing groove 202. This structure, by having the top of the cell body 100 snap into the inner wall of the first reinforcing groove 202, ensures the stability of the snap-fit ​​assembly between the cell body 100 and the clamping and reinforcing component 200, thereby reducing the complexity of the assembly operation and ensuring the stability and safety of use.

[0044] Specifically, in some implementations, such as Figure 1 and 4 As shown, the second clamping body 220 has a second reinforcing groove 203 on its surface facing the first clamping body 210; the end of the encapsulation film 130 facing the tab body 100 is tightly abutted against the inner wall of the second reinforcing groove 203. With this structure, the top of the battery cell body 100 is engaged with the inner wall of the second reinforcing groove 203 to ensure the stability of the engagement between the battery cell body 100 and the clamping and reinforcing component 200, thereby reducing the complexity of the assembly operation and ensuring stability and safety in use.

[0045] Specifically, in some implementations, such as Figure 1 and 2As shown, the clamping and reinforcing component 200 also includes at least one reinforcing member 230, which is disposed inside the clamping cavity 201, and its two ends are respectively connected to the first clamping body 210 and the second clamping body 220. In some embodiments, the number of reinforcing members 230 is two, and they are respectively disposed on both sides of the tab body 110; this can improve the stability of assembly while ensuring the normal use of the tab body 110.

[0046] In some implementation methods, such as Figure 2 and 4 As shown, the first clamping body 210 has a first fixing hole 213; the second clamping body 220 has a second fixing hole 214; one end of the reinforcing member 230 is connected to the first fixing hole 213; the other end of the reinforcing member 230 is connected to the second fixing hole 214. Further, the outer surface of one end of the reinforcing member 230 is in close contact with the inner wall of the first fixing hole 213; the outer surface of the other end of the reinforcing member 230 is in close contact with the inner wall of the second fixing hole 214; to ensure the stability of its assembly. Even further, as... Figure 4 As shown, a first fastener 251 is also provided in the first fixing hole 213; the first fastener 251 is detachably connected to one side of the reinforcing member 230; a second fastener 252 is also provided in the second fixing hole 214; the first fastener 251 is detachably connected to the other side of the reinforcing member 230. Both the second fixing hole 214 and the first fixing hole 213 are side-inverted T-shaped holes; the first fastener 251 is a first fastening screw; the second fastener 252 is a second fastening screw; both the left and right sides of the reinforcing member 230 are provided with threaded holes for assembly with the first fastening screw and the second fastening screw; thereby improving the convenience of disassembly and maintenance.

[0047] Furthermore, in some implementations, such as Figure 4 As shown, the first clamping body 210 is connected to the top sealing edge 134; the surface of the first clamping body 210 facing the second clamping body 220 is provided with a first reinforcing groove 202, and the end of the top sealing edge 134 facing the tab 110 is connected to the inner wall of the first reinforcing groove 202; at the same time, the second clamping body 220 is connected to the top sealing edge 134, and the surface of the second clamping body 220 facing the first clamping body 210 is provided with a second reinforcing groove 203; the end of the top sealing edge 134 facing the tab 110 is connected to the second reinforcing groove 203. Through the snap-fit ​​clamping action of the first reinforcing groove 202 and the second reinforcing groove 203 on the left and right sides, the assembly stability of the sealing film 130, the bare cell 120 and its tab 110 can be further improved, thereby improving the impact resistance of the battery packaging area and reducing the risk of packaging cracking.

[0048] Specifically, in some implementations, such as Figure 2 and 3As shown, the first clamping body 210 includes a first metal sheet 211 and a first sealing sheet 212 stacked sequentially. The first sealing sheet 212 is disposed inside the clamping cavity 201. The inner surface of the first sealing sheet 212 facing the top of the clamping cavity 201 abuts against the tab body 110, and the inner surface of the first sealing sheet 212 facing the bottom of the clamping cavity 201 abuts against the encapsulation film 130. The first metal sheet 211 is made of aluminum alloy or stainless steel; the first sealing sheet 212 is a sheet-like structure formed by sealant or a soft gasket. The clamping body is made of a high-strength metal material, such as aluminum alloy or stainless steel, to improve its tensile strength and toughness. Furthermore, the inner surface of the first metal sheet 211 is coated with sealant or a soft gasket to further enhance the sealing performance, thereby maintaining the internal sealing of the battery and preventing electrolyte leakage and external contamination.

[0049] Specifically, in some implementations, such as Figure 2 and 3 As shown, the second clamping body 220 includes a second metal sheet 221 and a second sealing sheet 222 stacked sequentially. The second sealing sheet 222 is disposed inside the clamping cavity 201. The inner surface of the second sealing sheet 222 facing the top of the clamping cavity 201 abuts against the tab body 110, and the inner surface of the second sealing sheet 222 facing the bottom of the clamping cavity 201 abuts against the encapsulation film 130. The second metal sheet 221 is made of aluminum alloy or stainless steel; the second sealing sheet 222 is a sheet-like structure formed by sealant or a soft gasket. The clamping body is made of a high-strength metal material, such as aluminum alloy or stainless steel, to improve its tensile strength and toughness. Furthermore, the inner surface of the second metal sheet 221 is coated with sealant or a soft gasket to further enhance the sealing performance, thereby maintaining the internal sealing of the battery and preventing electrolyte leakage and external contamination.

[0050] Specifically, in some implementations, such as Figure 2 and 3 As shown, the relationship between the thickness L3 of the tab 110 and the thickness L1 of the second metal sheet 221 or the second metal sheet 221 at the position of the cell body 100 (encapsulation film 130) satisfies: L3 = L1 * A; where A is 1 / 8 to 1 / 4. This structure ensures the stability of the assembly and the stability of the cell body 100 assembled to the battery inner shell through the second clamping body 220 and the first clamping body 210 of appropriate left and right dimensions.

[0051] Specifically, in some implementations, such as Figure 2 and 4As shown, the clamping cavity 201 contains a filler 240, the side surfaces of which are respectively connected to the inner surfaces of the first clamping body 210, the second clamping body 220, and the outer surface of the tab body 110. The filler 240 is made of materials such as polypropylene (PP) and polycarbonate (PC). Using materials such as polypropylene (PP) and polycarbonate (PC) improves the structural strength and enhances the overall structure's resistance to high temperatures, high pressures, and chemical corrosion. After the clamping and reinforcing component 200 is fully assembled onto the cell body 100, the corresponding filler 240 made of polypropylene (PP) or polycarbonate (PC) is injected into the interior of the clamping cavity 201. This reinforces and seals the battery encapsulation area, maintaining the battery's internal seal and preventing electrolyte leakage and external contamination. It also addresses the issue of seal damage caused by tab pulling during drops and improves the stability and durability of the pouch cell under extreme conditions during transportation and use.

[0052] This utility model also proposes a secondary battery, which includes a cell structure. The specific structure of the cell structure is as described in the above embodiments. Since this secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Utilizing the reversibility of chemical reactions, a new battery can be constructed; that is, after a chemical reaction converts into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be converted back into electrical energy. Therefore, it is called a secondary battery (rechargeable battery). The main types of rechargeable batteries on the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0055] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A battery cell structure, characterized in that: The device includes a battery cell body and a clamping and reinforcing component. The battery cell body includes an encapsulation film and a bare battery cell housed inside the encapsulation film. The encapsulation film includes a main body and a sealing edge. The bare battery cell is disposed within the main body. The main body includes a top wall, and the sealing edge includes a top sealing edge connected to the top wall. The bare battery cell has a tab. The tab includes a connection area, an encapsulation area, and an exposed area connected in sequence. The connection area is connected to the bare battery cell. The encapsulation area is located within the top sealing edge, and the exposed area extends from the end of the top sealing edge away from the main body, extending out of the encapsulation film. The clamping and reinforcing component is used to clamp the tab. The clamping and reinforcing component has a clamping cavity. At least a portion of the structure on the encapsulation area and / or the exposed area is disposed inside the clamping cavity.

2. The cell structure according to claim 1, characterized in that: The clamping and reinforcing component includes a first clamping body and a second clamping body; the first clamping body and the second clamping body are disposed opposite to each other, and a clamping cavity is formed between the first clamping body and the second clamping body; the first clamping body is connected to the encapsulation film, and one end of the first clamping body facing the main body is disposed above the top wall; the second clamping body is connected to the encapsulation film, and one end of the second clamping body facing the main body is disposed above the top wall.

3. The cell structure according to claim 2, characterized in that: The first clamping body abuts against the top wall at one end facing the main body, and the second clamping body abuts against the top wall at one end facing the main body.

4. The cell structure according to claim 2, characterized in that: The first clamping body includes a first metal sheet and a first sealing sheet stacked together; the first sealing sheet is disposed inside the clamping cavity; and the first sealing sheet abuts against the tab body on the inner surface of the clamping cavity; the first sealing sheet abuts against the encapsulation film on the inner surface of the clamping cavity. And / or, the second clamping body includes a second metal sheet and a second sealing sheet stacked together; the second sealing sheet is disposed inside the clamping cavity; and the second sealing sheet abuts against the tab body on the inner surface of the clamping cavity; the second sealing sheet abuts against the encapsulation film on the inner surface of the clamping cavity.

5. The cell structure according to claim 4, characterized in that: The relationship between the thickness L3 of the tab and the thickness L1 of the second metal sheet or the second metal sheet at the position of the encapsulation film satisfies: L3 = L1 * A; Where A is 1 / 8 to 1 / 4.

6. The cell structure according to claim 2, characterized in that: The clamping and reinforcing component further includes at least one reinforcing member, which is disposed inside the clamping cavity, and the two ends of the reinforcing member are respectively connected to the first clamping body and the second clamping body; The first clamping body is provided with a first fixing hole; one end of the reinforcing member is connected to the first fixing hole; And / or, the second clamping body is provided with a second fixing hole; the other end of the reinforcing member is connected to the second fixing hole.

7. The cell structure according to claim 2, characterized in that: The first clamping body is connected to the top sealing edge, the second clamping body is connected to the top sealing edge, and the surface of the first clamping body facing the second clamping body is provided with a first reinforcing groove; the end of the top sealing edge facing the tab is connected to the inner wall of the first reinforcing groove; And / or, the second clamping body has a second reinforcing groove on one side surface facing the first clamping body; the top sealing edge is connected to the inner wall of the second reinforcing groove at one end facing the tab body.

8. The cell structure according to claim 7, characterized in that: The side surface of the first clamping body facing the second clamping body is also connected to the exposed area; And / or, the side surface of the second clamping body facing the first clamping body is also connected to the exposed area.

9. The cell structure according to any one of claims 2-8, characterized in that: The clamping cavity is provided with a filler, and the side surface of the filler is respectively connected to the inner surface of the first clamping body, the inner surface of the second clamping body, and the outer surface of the tab body; The filler is polypropylene or polycarbonate.

10. A secondary battery, characterized in that: Includes the cell structure described in any one of claims 1 to 9.

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