Lithium ion battery and electronic equipment

Abstract

The utility model provides electronic equipment and a lithium ion battery. The lithium ion battery comprises a pole group; a glue structure; a bottom case; the top cover is connected with the bottom shell, a containing space is formed between the top cover and the bottom shell, the pole group is located in the containing space, a groove is formed in the side, facing the pole group, of the bottom shell and / or the top cover, the bottom shell and / or the top cover are / is connected with the pole group through a glue structure, and at least one part of the glue structure is contained in the groove. The problem that in the prior art, bonding of a bonding layer is not firm is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a lithium-ion battery and an electronic device. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronic devices such as mobile phones and smartwatches due to their advantages such as high energy density, high charge and discharge efficiency, and long cycle life. During battery production, an adhesive layer is often used to connect the electrode assembly and the outer aluminum-plastic film to secure the electrode assembly and reduce the impact of external shocks on the internal electrode assembly, thereby ensuring battery safety and extending its lifespan. In battery production, the outermost layer of the commonly used electrode assembly is metal foil, which is bonded to the outer casing by the adhesive layer to secure the electrode assembly. However, due to the difference between the organic material of the adhesive layer and the materials of the metal foil and outer casing, the adhesive layer can easily detach from the foil or casing during actual use, causing safety issues. Utility Model Content

[0003] The main objective of this invention is to provide a lithium-ion battery and electronic device to solve the problem of weak adhesion of the adhesive layer in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a lithium-ion battery is provided, comprising an electrode assembly; a rubber structure; a bottom shell; and a top cover, wherein the top cover is connected to the bottom shell and forms a receiving space between the two, the electrode assembly is located within the receiving space, and a groove is provided on the side of the bottom shell and / or the top cover facing the electrode assembly, the bottom shell and / or the top cover being connected to the electrode assembly through the rubber structure, and at least a portion of the rubber structure being accommodated within the groove.

[0005] Furthermore, there are multiple grooves, and multiple groove arrays are arranged on the top cover and / or bottom shell.

[0006] Furthermore, the distance L between the center points of two adjacent grooves satisfies the condition: 1.5mm-6mm.

[0007] Furthermore, the bottom shell includes a central bonding area and an outer heat dissipation area. The outer heat dissipation area is arranged around the outer periphery of the central bonding area, and multiple grooves are provided in both the outer heat dissipation area and the central bonding area. The adhesive structure is correspondingly arranged in the central bonding area.

[0008] Furthermore, the area of ​​the groove opening is the same as the area of ​​the groove bottom; and / or the cross-sectional area of ​​the groove remains unchanged along its depth direction; and / or the cross-section of the groove includes at least one of polygonal, circular, and elliptical shapes.

[0009] Furthermore, the cross-section of the groove is a regular polygon, and the side length of the regular polygon satisfies: 1mm-5mm.

[0010] Furthermore, the base plate has a groove; the side plate is integrally formed with the base plate and continuously arranged around the outer periphery of the base plate, and the side plate is connected to the top cover.

[0011] Furthermore, the electrode assembly includes: an electrode assembly body; a diaphragm, the diaphragm wrapping around and covering the electrode assembly body, the tail end of the diaphragm overlapping a portion of the diaphragm to form a junction edge, and at least a portion of the adhesive structure covering the junction edge.

[0012] Furthermore, the depth of the groove is less than the thickness of the top cover and / or the thickness of the bottom shell.

[0013] Furthermore, the thickness of the bottom shell and the top cover is 0.1mm-0.3mm; and / or the depth of the groove is 0.01mm-0.1mm.

[0014] Furthermore, the top cover and the bottom shell are welded together, and a welding gap of 0.005mm-0.05mm is reserved between the top cover and the bottom shell.

[0015] Furthermore, the adhesive structure is double-sided adhesive or hot melt adhesive; and / or the material of the top cover and bottom shell is one of alloy, carbon structural steel, alloy structural steel, or stainless steel.

[0016] According to another aspect of the present invention, an electronic device is provided that includes the aforementioned lithium-ion battery.

[0017] By applying the technical solution of this utility model, the following technical effects are achieved:

[0018] 1. Due to the grooves provided on the bottom shell and top cover, at least a portion of the adhesive structure is accommodated within the grooves. These grooves increase the bonding area of ​​the adhesive structure, thereby improving the connection strength between the electrode assembly and the bottom shell or top cover. The electrode assembly-adhesive layer-shell (bottom shell or top cover) stable structure has high stability, enabling the internal electrode assembly and the external shell to form a unified whole, thus mitigating the problem of electrode assembly separation from the shell caused by electrolyte immersion, vibration, drops, and other practical processes.

[0019] 2. Simultaneously, heat transfer is achieved through the adhesive structure. The grooves increase the contact area with the top cover or bottom shell, which facilitates the rapid dissipation of heat inside the cell, prevents thermal runaway caused by heat accumulation inside the cell, and improves heat dissipation efficiency. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the overall structure of this application is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Electrode assembly; 20. Adhesive structure; 30. Bottom shell; 40. Top cover; 50. Groove. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] See Figure 1 The lithium-ion battery includes an electrode assembly 10, a gel structure 20, a bottom shell 30, and a top cover 40. The top cover 40 is connected to the bottom shell 30 and forms a receiving space between them. The bottom shell 30 and / or the top cover 40 are provided with a groove 50 on the side facing the electrode assembly 10. The bottom shell 30 and / or the top cover 40 are connected to the electrode assembly 10 through the gel structure 20, and at least a portion of the gel structure 20 is accommodated in the groove 50.

[0028] Because the bottom shell 30 and the top cover 40 are provided with grooves 50, at least a portion of the adhesive structure 20 is accommodated within the grooves 50. The grooves 50 increase the bonding area of ​​the adhesive structure 20, thereby improving the connection strength between the electrode assembly 10 and the bottom shell 30 or the top cover 40. The electrode assembly 10-adhesive layer-shell (bottom shell 30 or top cover 40) stable structure has high stability and can integrate the internal electrode assembly 10 with the external shell into a whole, improving the problem of separation between the electrode assembly 10 and the shell caused by actual processes such as electrolyte immersion, vibration, and drops.

[0029] Meanwhile, heat is transferred through the adhesive structure 20, and the groove 50 can increase the contact area with the top cover 40 or the bottom shell 30, which is conducive to the rapid diffusion of heat inside the cell, prevents thermal runaway caused by heat accumulation inside the cell, and improves the efficiency of heat dissipation.

[0030] In this application, there are multiple grooves 50, and multiple grooves 50 are arranged in an array on the top cover 40 and / or the bottom shell 30.

[0031] By setting multiple grooves 50, the contact area between the adhesive structure 20 and the top cover 40 and the bottom shell 30 can be further increased. At the same time, the array of grooves 50 not only facilitates processing, but also balances stress and heat dissipation.

[0032] In this application, the distance L between the center points of two adjacent grooves 50 satisfies: 1.5mm-6mm.

[0033] The distance between two adjacent grooves 50 needs to meet certain requirements. If the distance between the two grooves 50 is too small, it will result in the grooves 50 being too close together, affecting the structural strength and making the processing difficult. If the distance between the two grooves 50 is too small, it will result in too few grooves 50, failing to achieve the required effect of improving bonding strength and heat dissipation.

[0034] In this application, the bottom shell 30 includes a central bonding area and an outer heat dissipation area. The outer heat dissipation area is arranged around the outer periphery of the central bonding area, and multiple grooves 50 are provided in both the outer heat dissipation area and the central bonding area. The adhesive structure 20 is correspondingly arranged in the central bonding area.

[0035] Specifically, the bonding area is mainly used for connection with the adhesive structure 20, and the groove 50 in the bonding area is mainly used to increase the bonding area and dissipate heat; the heat dissipation area is mainly used for heat dissipation, and the groove 50 in the heat dissipation area mainly serves to increase the heat dissipation area and dissipate heat.

[0036] In this application, the groove opening area of ​​the groove 50 is the same as the groove bottom area of ​​the groove 50, the cross-sectional area of ​​the groove 50 remains unchanged along its depth direction, and the cross-section of the groove 50 includes at least one of polygon, circle, and ellipse.

[0037] Specifically, the area of ​​the groove opening of the groove 50 is the same as the area of ​​the groove bottom, and the cross-sectional area of ​​the groove 50 remains constant along its depth direction, which facilitates the processing of the groove 50. The cross-section of the groove 50 includes at least one of polygon, circle, and ellipse; the groove 50 can be of any shape, as long as it is easy to process. In a preferred embodiment, the groove 50 is a regular polygon.

[0038] In this application, the cross-section of the groove 50 is a regular polygon, and the side length of the regular polygon satisfies: 1mm-5mm.

[0039] Specifically, if the side length of the regular polygon is too large, the area of ​​a single groove 50 will be too large, making it difficult for the groove 50 to achieve the effects of increasing the bonding area and heat dissipation. If the deformation of the regular polygon is too small, the groove 50 will be too small and difficult to process.

[0040] In this application, the bottom shell 30 includes a bottom plate and a side plate. A groove 50 is provided on the bottom plate. The side plate is integrally formed with the bottom plate and is continuously arranged around the outer periphery of the bottom plate. The side plate is connected to the top cover 40.

[0041] Specifically, the side plates and the bottom plate are integrally formed, which facilitates the processing of the bottom shell 30 and increases the structural strength between the bottom plate and the side plates.

[0042] In this application, the electrode assembly 10 includes an electrode assembly 10 body and a diaphragm. The diaphragm wraps around and covers the electrode assembly 10 body. The tail end of the diaphragm overlaps a portion of the diaphragm to form a junction edge, and at least a portion of the adhesive structure 20 covers the junction edge.

[0043] The diaphragm serves a protective function, safeguarding the main body of the electrode assembly 10. The tail end of the diaphragm overlaps a portion of the diaphragm to form a junction edge, and at least a portion of the adhesive structure 20 covers the junction edge. By pressing the junction edge with the adhesive structure 20, when the electrode assembly 10 is installed in the receiving space, the adhesive structure 20 and the bottom shell 30 or top cover 40 apply pressure to the junction edge, increasing the connection strength of the junction edge.

[0044] The electrode assembly 10 has one of the following structures: copper foil termination, aluminum foil termination, and diaphragm termination, with the diaphragm termination structure being preferred. The electrode assembly 10 consists of a positive electrode plate, a negative electrode plate, a diaphragm, at least one positive electrode conductor connector, and at least one negative electrode conductor connector.

[0045] In this application, the depth of the groove 50 is less than the thickness of the top cover 40 and / or the thickness of the bottom shell 30. The thickness of the bottom shell 30 and the thickness of the top cover 40 are 0.1mm-0.3mm, and the depth of the groove 50 is 0.01mm-0.1mm.

[0046] To ensure a stable environment inside the battery, the groove 50 is a blind hole, so the depth of the groove 50 is less than the thickness of the top cover 40 and the bottom shell 30.

[0047] In this application, the top cover 40 and the bottom shell 30 are welded together, and a welding gap of 0.005mm-0.05mm is reserved between the top cover 40 and the bottom shell 30.

[0048] Specifically, welding facilitates the connection between the top cover 40 and the bottom shell 30, and ensures a stable connection between them. Pre-reserving weld seams before welding facilitates subsequent welding.

[0049] In this application, the adhesive structure 20 is double-sided adhesive or hot melt adhesive, and the top cover 40 and bottom shell 30 are made of one of the following materials: alloy, carbon structural steel, alloy structural steel, and stainless steel.

[0050] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0051] 1. Because the bottom shell 30 and the top cover 40 are provided with grooves 50, at least a portion of the adhesive structure 20 is accommodated in the grooves 50. The grooves 50 can increase the bonding area of ​​the adhesive structure 20, thereby improving the connection strength between the electrode assembly 10 and the bottom shell 30 or the top cover 40. The electrode assembly 10-adhesive layer-shell (bottom shell 30 or top cover 40) stable structure has high stability and can form the internal electrode assembly 10 and the external shell into a whole, improving the problem of separation of the electrode assembly 10 from the shell caused by actual processes such as electrolyte immersion, vibration, and drops.

[0052] 2. At the same time, heat is transferred through the adhesive structure 20. The groove 50 can increase the contact area with the top cover 40 or the bottom shell 30, which is conducive to the rapid diffusion of heat inside the cell, prevents thermal runaway caused by heat accumulation inside the cell, and improves the efficiency of heat dissipation.

[0053] 3. By setting multiple grooves 50, the contact area between the adhesive structure 20 and the top cover 40 and the bottom shell 30 can be further increased. At the same time, the array of grooves 50 not only facilitates processing, but also balances the force and heat dissipation.

[0054] 4. The steel shell structure of the bottom shell 30 and top cover 40 protects the internal electrode assembly, and the internal electrode assembly is fixed with a glue structure combined with grooves to prevent the electrode assembly from shaking during actual use.

[0055] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0058] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium-ion battery, characterized by, The lithium ion battery comprises: a pole group (10); a glue structure (20); a bottom shell (30); a top cover (40) connected with the bottom shell (30) and forming a containing space between the bottom shell (30) and the top cover (40), the pole group (10) being located in the containing space, a side of the bottom shell (30) and / or the top cover (40) towards the pole group (10) being provided with a groove (50), the bottom shell (30) and / or the top cover (40) being connected with the pole group (10) through the glue structure (20), and at least a part of the glue structure (20) being accommodated in the groove (50).

2. The lithium-ion battery of claim 1, wherein, The number of the grooves (50) is multiple, and the multiple grooves (50) are arranged in an array on the top cover (40) and / or the bottom shell (30).

3. The lithium-ion battery of claim 2, wherein, The distance L between the center points of two adjacent grooves (50) satisfies 1.5mm-6mm.

4. The lithium-ion battery of claim 1, wherein, The bottom shell (30) comprises a middle bonding area and an outer heat dissipation area, the outer heat dissipation area being arranged around the outer circumferential side of the middle bonding area, and the outer heat dissipation area and the middle bonding area are both provided with multiple grooves (50), and the glue structure (20) is correspondingly arranged in the middle bonding area.

5. The lithium ion battery according to claim 1, wherein The groove mouth area of the groove (50) is consistent with the groove bottom area of the groove (50); and / or The cross-sectional area of the groove (50) is constant along the depth direction thereof; and / or The cross section of the groove (50) comprises at least one of a polygon, a circle and an ellipse.

6. The lithium-ion battery of claim 1, wherein, The cross section of the groove (50) is a regular polygon, and the side length of the regular polygon satisfies 1mm-5mm.

7. The lithium-ion battery of claim 1, wherein, The bottom shell (30) comprises: a bottom plate provided with the groove (50); a side plate integrally formed with the bottom plate and continuously arranged around the outer circumferential edge of the bottom plate, the side plate being connected with the top cover (40).

8. The lithium-ion battery of claim 1, wherein, The pole group (10) comprises: a pole group (10) main body; a diaphragm wrapped around the pole group (10) main body, a tail end of the diaphragm being overlapped on a part of the diaphragm to form a joint edge, and at least a part of the glue structure (20) covering the joint edge.

9. The lithium-ion battery of any one of claims 1-7, wherein, The depth of the groove (50) is less than the thickness of the top cover (40) and / or the thickness of the bottom shell (30).

10. The lithium ion battery according to any one of claims 1-7, wherein The thickness of the bottom shell (30) and the thickness of the top cover (40) are 0.1mm-0.3mm; and / or The depth of the groove (50) is 0.01mm-0.1mm.

11. The lithium-ion battery of any one of claims 1-7, wherein, The top cover (40) and the bottom shell (30) are welded, and a welding reserved seam of 0.005mm-0.05mm is reserved between the top cover (40) and the bottom shell (30).

12. The lithium ion battery according to any one of claims 1-7, wherein The glue structure (20) is double-sided adhesive or hot melt adhesive; and / or The material of the top cover (40) and the bottom shell (30) is one of an alloy, a carbon structural steel, an alloy structural steel and a stainless steel.

13. An electronic device, comprising: A lithium ion battery comprising any one of claims 1 to 12.

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