Electrochemical device and electric equipment

Abstract

The utility model belongs to the battery technical field, concretely relates to a kind of electrochemical device and electric equipment, the electrochemical device includes hot melt adhesive, packing shell and electrode assembly;The packing shell is equipped with placing cavity;The electrode assembly is set in the inside of placing cavity;The inner wall of placing cavity has oppositely arranged first side wall and second side wall, and the hot melt adhesive is arranged between the electrode assembly and the first side wall;The second side wall is equipped with at least one groove, and the groove is sequentially arranged along the surface of the second side wall and is arranged.The utility model can increase the friction between packing shell and electrode assembly, to reduce the displacement of electrode assembly in packing structure, can improve the stability and security of use;It can also be beneficial to improve drop test passing probability.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to an electrochemical device and electrical equipment. Background Technology

[0002] With the development of the mobile phone industry, the safety requirements for battery drop protection are becoming increasingly stringent. Because the internal battery core and outer aluminum-plastic film are usually not bonded together, the internal core can move freely, increasing the risk of drop failure. To address this issue, hot melt adhesive is typically applied to the surface of the battery core during drops, bonding it to the aluminum-plastic film. To prevent tearing, the hot melt adhesive is usually applied to the side not used for mounting, providing some cushioning as the core moves within the aluminum-plastic film.

[0003] However, hot melt adhesive is typically not applied between the battery core and the aluminum-plastic film on the mounting side inside the battery. During a drop, the core and film will shift relative to each other. Furthermore, the electrolyte inside the cell acts as a lubricant, which exacerbates the movement of the core on the mounting side. This results in significant displacement of the core within the aluminum-plastic film, making it prone to collisions with internal components of electronic devices, leading to drop test failure; thus reducing the safety and stability of the battery in use. Utility Model Content

[0004] The purpose of this invention is to provide an electrochemical device that addresses the shortcomings of existing technologies, thereby increasing the friction between the core and the aluminum-plastic film and improving the probability of passing drop tests.

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

[0006] An electrochemical device is characterized by comprising hot melt adhesive, a packaging shell, and an electrode assembly; the packaging shell is provided with a placement cavity; the electrode assembly is disposed inside the placement cavity; the inner wall of the placement cavity has a first sidewall and a second sidewall disposed opposite to each other, the hot melt adhesive is disposed between the electrode assembly and the first sidewall; the second sidewall is provided with at least one groove, the grooves being arranged sequentially along the surface of the second sidewall.

[0007] Preferably, the packaging shell includes a supporting protective outer layer, a base layer, an anti-corrosion protective inner layer, and at least one connecting layer; the anti-corrosion protective inner layer is disposed close to the electrode assembly; the supporting protective outer layer, the base layer, and the anti-corrosion protective inner layer are stacked sequentially; the connecting layer connects the supporting protective outer layer and the base layer and / or the base layer and the anti-corrosion protective inner layer; the groove is disposed on the side surface of the anti-corrosion protective inner layer away from the base layer; the grooves are arranged sequentially along one side surface of the anti-corrosion protective inner layer.

[0008] Preferably, the relationship between the thickness h1 of the anti-corrosion protective inner layer and the depth h2 of the groove satisfies: h2=A*h1; where 10%≤A≤60%;

[0009] And / or, the width L2 of the groove satisfies: 0.1mm≤L2≤1.0mm.

[0010] Preferably, the groove is U-shaped; or the groove is V-shaped.

[0011] Preferably, the groove includes at least two horizontal segments; the horizontal segments are arranged sequentially along the width direction of the anti-corrosion protective inner layer; and a groove gap is provided between two adjacent horizontal segments.

[0012] Preferably, the groove further includes at least two longitudinal sections; the longitudinal sections are arranged sequentially along the length of the anti-corrosion protective inner layer; and a groove gap is provided between two adjacent longitudinal sections;

[0013] Preferably, the longitudinal segment and the horizontal segment are arranged to intersect to form an angle α; the angle α satisfies: 30°≤α≤160°.

[0014] Preferably, the width L1 of the groove gap satisfies: 1mm ≤ L1 ≤ 4mm;

[0015] And / or, the width L1 of the groove gap and the width L2 of the groove satisfy the following condition: L2=B*L1, where 2≤B≤4.

[0016] Preferably, the supporting protective outer layer is a nylon protective layer; the connecting layer includes a first adhesive layer; the two sides of the first adhesive layer are respectively connected to the nylon protective layer and the base layer;

[0017] And / or the anti-corrosion protective inner layer is a polypropylene protective layer; the connecting layer further includes a second adhesive layer; the two side surfaces of the second adhesive layer are respectively connected to the polypropylene protective layer and the base layer; and the groove is provided on the side surface of the polypropylene protective layer away from the second adhesive layer;

[0018] And / or the base layer is a metal foil layer.

[0019] This utility model also discloses an electrical device, including the aforementioned battery.

[0020] The beneficial effects of this utility model are that by adding at least one groove to the second side wall of the non-assembly surface between the packaging shell and the electrode assembly, the friction coefficient of the surface of the anti-corrosion protective inner layer is increased, thereby increasing the friction force and reducing the displacement of the core within the packaging structure, which can improve the stability and safety of use; it can also help increase the probability of passing the drop test. Attached Figure Description

[0021] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of an electrochemical device according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of an electrochemical device according to an embodiment of the present invention;

[0024] Figure 3 This is a bottom view of an electrochemical device according to an embodiment of the present invention;

[0025] Figure 4 This is a bottom view of an electrochemical device according to another embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of an electrochemical device according to an embodiment of the present invention.

[0027] In the diagram: 1-Outer protective layer; 11-Nylon protective layer; 2-Base layer; 21-Metal foil layer; 3-Inner anti-corrosion protective layer; 301-Polypropylene protective layer; 31-Groove; 302-Groove gap; 311-Longitudinal section; 312-Horizontal section; 4-Connecting layer; 41-First adhesive layer; 42-Second adhesive layer; 100-Packaging shell; 101-First sidewall; 102-Second sidewall; 200-Hot melt adhesive; 300-Electrode assembly. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0034] like Figure 1 As shown, in one embodiment of this utility model, the electrochemical device includes a hot melt adhesive 200, a packaging shell 100, and an electrode assembly 300. The packaging shell 100 has a placement cavity. The electrode assembly 300 is disposed inside the placement cavity. The inner wall of the placement cavity has a first sidewall 101 and a second sidewall 102 disposed opposite to each other. The hot melt adhesive 200 is disposed between the electrode assembly 300 and the first sidewall 101. The second sidewall 102 has at least one groove 31, and the grooves 31 are arranged sequentially along the surface of the second sidewall 102.

[0035] The technical solution of this utility model increases the friction coefficient of the surface of the anti-corrosion protective inner layer by adding at least one groove on the second side wall of the non-assembly surface between the packaging shell and the electrode assembly. This increases the friction force, thereby reducing the displacement of the core within the packaging structure, improving the stability and safety of use, and also increasing the probability of passing the drop test.

[0036] Specifically, in some implementations, such as Figure 1 and 2 As shown, the packaging shell 100 includes a supporting protective outer layer 1, a base layer 2, an anti-corrosion protective inner layer 3, and at least one connecting layer 4; the supporting protective outer layer 1, the base layer 2, and the anti-corrosion protective inner layer 3 are stacked sequentially; and the connecting layer 4 connects the supporting protective outer layer 1 and the base layer 2 and / or the base layer 2 and the anti-corrosion protective inner layer 3; a groove 31 is provided on the surface of the anti-corrosion protective inner layer 3 away from the base layer 2; the grooves 31 are arranged sequentially along one side surface of the anti-corrosion protective inner layer 3. The grooves 31 can be achieved by laser etching, machining, molding, etc. This structure increases the friction coefficient of the anti-corrosion protective inner layer surface by adding at least one groove on the non-assembly surface, thereby increasing the friction between the non-assembly surface and the corresponding electrode assembly 300, thus reducing the large displacement of the electrode assembly 300 within the packaging structure; it also improves the stability and safety of use; and it helps to increase the probability of passing drop tests.

[0037] Specifically, in some implementations, such as Figure 2 and 3As shown, the outer protective layer 1 is a nylon protective layer 11; the connecting layer 4 includes a first adhesive layer 41; the two sides of the first adhesive layer 41 are respectively connected to the nylon protective layer 11 and the base layer 2; the inner anti-corrosion protective layer 3 is a polypropylene protective layer 301; the connecting layer 4 also includes a second adhesive layer 42; the two sides of the second adhesive layer 42 are respectively connected to the polypropylene protective layer 301 and the base layer 2; and grooves are provided on the side surface of the polypropylene protective layer 301 away from the second adhesive layer 42. The first adhesive layer 41 and the second adhesive layer 42 are both polyurethane adhesives (PU adhesives) or acrylic adhesives, etc. The base layer 2 is a metal foil layer 21; preferably aluminum foil. This structure increases the surface roughness by adding multiple sets of grooves 301 to the polypropylene protective layer 301, thereby increasing the static friction between the core and the coil, preventing the core from sliding or shifting under severe impact, and reducing the probability of cell failure in drop tests. The structure also utilizes a polypropylene protective layer 301, which acts as a "sealing core + protective barrier + structural support" to achieve the "barrier protection" function. Furthermore, the structure leverages the four key capabilities of the nylon protective layer 11—puncture resistance, impact resistance, chemical resistance, and strong composite properties—to protect the integrity of the internal critical barrier layer (aluminum foil), while also adapting to the needs of processing and usage scenarios.

[0038] Specifically, in some implementations, such as Figure 2 and 3 As shown, the relationship between the thickness h1 of the anti-corrosion protective inner layer 3 (middle polypropylene protective layer 301) and the depth h2 of the groove 31 satisfies: h2=A*h1; where 10%≤A≤60%; preferably 50%. Further, the thickness h1 of the anti-corrosion protective inner layer 3 (middle polypropylene protective layer 301) satisfies: 10um≤h1≤80um; it can be 10um, 15um, 20um, 30um, 40um, 50um, 80um, etc., preferably 50um. And the depth h2 of the groove 31 satisfies: 5um≤h2≤20um; it can be 5um, 6um, 7um, 8um, 9um, 10um, 15um, 20um, etc.; preferably 20um. This structure ensures structural stability through the appropriate thickness difference between the anti-corrosion protective inner layer 3 and the groove 31, and can also appropriately increase the coefficient of friction.

[0039] Specifically, in some implementations, such as Figure 3 As shown, the width L2 of the groove 31 satisfies: 0.1mm ≤ L2 ≤ 1.0mm, and can be 0.1mm, 0.2mm, 0.3mm, 0.35mm, 0.7mm, 0.8mm, 1.0mm, etc., preferably 0.5mm. This structure ensures structural stability through the groove 31 with a suitable width value, and can also appropriately improve the coefficient of friction.

[0040] Specifically, in some of these implementations, such as Figure 3 and 4 As shown in Figure 5, the groove 31 includes at least two horizontal segments 312; the horizontal segments 312 are arranged sequentially along the width direction of the anti-corrosion protective inner layer 3 (middle polypropylene protective layer 301); and a groove gap 302 is provided between two adjacent horizontal segments 312. The horizontal segments 312 are all straight or curved; and the cross-section of each horizontal segment 312 is U-shaped or V-shaped. That is, as shown in Figure 5... Figure 4 As shown, the horizontal segments 312 are arranged at intervals along the vertical (width) direction of the anti-corrosion protective inner layer 3 to further increase the friction between the battery cell and the anti-corrosion protective inner layer 3, and to improve the probability of passing the drop test.

[0041] Specifically, in other implementations, such as Figure 3 and 5 As shown, the groove 31 includes at least two horizontal segments 312 and at least two longitudinal segments 311. The horizontal segments 312 are arranged sequentially along the width direction of the anti-corrosion protective inner layer 3 (middle polypropylene protective layer 301). The longitudinal segments 311 are arranged sequentially along the length direction of the anti-corrosion protective inner layer 3 (middle polypropylene protective layer 301). The longitudinal segments 311 intersect with the horizontal segments 312. A groove gap 302 is provided between two adjacent horizontal segments 312. The groove gap 302 is provided between two adjacent longitudinal segments 311 to form a grid-like groove assembly. The horizontal segments 312 and longitudinal segments 311 are both straight or curved. The cross-sections of the horizontal segments 312 and longitudinal segments 311 are both U-shaped or V-shaped. That is, as shown... Figure 4 As shown, the horizontal segments 312 are arranged at intervals along the vertical direction (width direction) of the anti-corrosion protective inner layer 3, and the vertical segments 311 are arranged at intervals along the horizontal direction (length direction) of the anti-corrosion protective inner layer 3, so as to further increase the friction between the battery cell and the anti-corrosion protective inner layer 3, and help improve the probability of passing the drop test.

[0042] Furthermore, in some implementations, such as Figure 4 and 5 As shown, the width L1 of the groove gap 302 satisfies: 1mm≤L1≤4mm, and can be 1mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 3.1mm, 3mm, 3.8mm, 4mm, etc.; preferably 2mm. This structure maximizes the coefficient of friction between the groove assembly and the battery cell, and avoids excessive slippage of the battery cell.

[0043] Furthermore, in some implementations, such as Figure 3 , 4As shown in Figure 5, the width L1 of the groove gap 302 and the width L2 of the groove 31 satisfy the following condition: L2 = B * L1, where 2 ≤ B ≤ 4; preferably, L2 = 4 * L1. This structure maximizes the coefficient of friction between the groove assembly and the battery cells and avoids excessive slippage of the battery cells.

[0044] Furthermore, in some implementations, such as Figure 5 As shown, the angle α formed by the intersection of the longitudinal segment 311 and the horizontal segment 312 satisfies: 30°≤α≤160°, which can be 30°, 30°, 40°, 45°, 60°, 80°, 90°, 120°, 160°, etc.; preferably 90° and 120°; so as to maximize the friction coefficient between the cells by the grid-like groove assembly and avoid excessive slippage of the cells.

[0045] The electrode assembly 300 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area. The positive electrode coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes the negative electrode active material, which can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0046] The present invention also proposes an electrical device, which includes an electrochemical device. The specific structure of the electrochemical device is as described in the above embodiments. Since the present electrical device 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.

[0047] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. 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, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0048] 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.

[0049] 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. An electrochemical device, characterized in that: The device includes hot melt adhesive, a packaging shell, and an electrode assembly; the packaging shell has a placement cavity; the electrode assembly is disposed inside the placement cavity; the inner wall of the placement cavity has a first sidewall and a second sidewall disposed opposite to each other, and the hot melt adhesive is disposed between the electrode assembly and the first sidewall; the second sidewall has at least one groove, and the grooves are arranged sequentially along the surface of the second sidewall.

2. The electrochemical device according to claim 1, characterized in that: The packaging shell includes a supporting protective outer layer, a base layer, an anti-corrosion protective inner layer, and at least one connecting layer; the anti-corrosion protective inner layer is disposed close to the electrode assembly; the supporting protective outer layer, the base layer, and the anti-corrosion protective inner layer are stacked sequentially; the connecting layer connects the supporting protective outer layer and the base layer and / or the base layer and the anti-corrosion protective inner layer; the groove is disposed on the side surface of the anti-corrosion protective inner layer away from the base layer; the groove is arranged sequentially along one side surface of the anti-corrosion protective inner layer.

3. The electrochemical device according to claim 2, characterized in that: The relationship between the thickness h1 of the anti-corrosion protective inner layer and the depth h2 of the groove satisfies: h2=A*h1; where 10%≤A≤60%; And / or, the width L2 of the groove satisfies: 0.1mm≤L2≤1.0mm.

4. The electrochemical device according to claim 2 or 3, characterized in that: The groove is U-shaped; or the groove is V-shaped.

5. The electrochemical device according to claim 2 or 3, characterized in that: The groove includes at least two horizontal segments; the horizontal segments are arranged sequentially along the width direction of the anti-corrosion protective inner layer; and a groove gap is provided between two adjacent horizontal segments.

6. The electrochemical device according to claim 5, characterized in that: The groove also includes at least two longitudinal sections; the longitudinal sections are arranged sequentially along the length of the anti-corrosion protective inner layer; and a groove gap is provided between two adjacent longitudinal sections.

7. The electrochemical device according to claim 6, characterized in that: The longitudinal segment and the horizontal segment are intersecting to form an angle α; the angle α satisfies: 30°≤α≤160°.

8. The electrochemical device according to claim 6, characterized in that: The width L1 of the groove gap satisfies: 1mm≤L1≤4mm; And / or, the width L1 of the groove gap and the width L2 of the groove satisfy the following condition: L2=B*L1, where 2≤B≤4.

9. The electrochemical device according to claim 2, characterized in that: The supporting protective outer layer is a nylon protective layer; the connecting layer includes a first adhesive layer; the two sides of the first adhesive layer are respectively connected to the nylon protective layer and the base layer; And / or the anti-corrosion protective inner layer is a polypropylene protective layer; the connecting layer further includes a second adhesive layer; the two side surfaces of the second adhesive layer are respectively connected to the polypropylene protective layer and the base layer; and the groove is provided on the side surface of the polypropylene protective layer away from the second adhesive layer; And / or the base layer is a metal foil layer.

10. An electrical appliance, characterized in that: Includes the electrochemical device according to any one of claims 1 to 9.

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