Battery cell and electronic equipment

Abstract

The utility model provides a battery cell and electronic equipment, the battery cell comprises a first shell, a second shell and a reinforcing part, the first shell and the second shell are jointed, a groove is formed in the first shell, the groove is located on the adjacent side of the joint of the first shell and the second shell, and the reinforcing part is arranged in the groove. The groove is recessed in the direction close to the second shell, and at least part of the reinforcing part is arranged on the groove wall of the groove. The strengthening part is at least partially arranged on the groove wall of the groove, and a local strengthening structure is formed at the groove, so that the strengthening part can restrain the deformation at the groove when electrolyte is consumed and the internal pressure of the battery cell is reduced in the circulation process of the battery cell, thereby preventing the height of the head of the battery cell from changing, and improving the reliability of the battery cell. And the extrusion of the battery cell to the elements above the battery cell due to the increase of the height of the head of the battery cell is avoided.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery cell and an electronic device. Background Art

[0002] In conventional multi-tab wound cells or stacked cells, during the cycle, as the electrolyte is consumed, the pressure in the cavity decreases, the angle of the folded tab area at the head becomes smaller, causing the groove at the head of the cell shell to shrink, and then the height of the head of the cell shell increases. Figure 1 The figure shows the angle a between the pole piece and the pole ear and the height h1 of the head of the battery shell in the initial state of a conventional battery cell. Figure 2 The figure shows the angle b between the pole piece and the pole ear and the height h2 of the head of the battery case of a conventional battery cell after several cycles, where a>b and h1<h2.

[0003] This phenomenon may cause other components above the battery cell to be squeezed. For example, when the battery cell is used in electronic equipment, the increased height of the head of the battery cell shell may cause a top print on the display screen above the battery cell, affecting the display effect. Utility Model Content

[0004] In view of this, the present application provides a battery cell and an electronic device, which can suppress the height variation of the battery cell head tab area.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, the present application provides a battery cell, comprising a first shell, a second shell and a reinforcement portion, wherein the first shell and the second shell are joined, and a groove is formed in the first shell, wherein the groove is located adjacent to the joint of the first shell and the second shell, and the groove is recessed in a direction close to the second shell, and the reinforcement portion is at least partially arranged on the groove wall of the groove.

[0007] In this embodiment, a local reinforcement structure is formed at the groove by at least partially disposing the reinforcement part on the groove wall of the groove. During the cycle of the battery cell, when the electrolyte is consumed and the internal pressure of the battery cell is reduced, the reinforcement part can suppress the deformation of the groove, thereby preventing the height of the battery cell head from changing, thereby avoiding the battery cell from squeezing the components above it due to the increase in the height of the battery cell head.

[0008] In an optional embodiment, the reinforcement portion is made of curing glue.

[0009] In this embodiment, the reinforcement part is made of curing glue, which has strong plasticity, is easy to shape, and has a fast curing speed, which is beneficial to improving production efficiency. It also has higher strength after curing, which is beneficial to improving the structural strength of the groove.

[0010] In an optional embodiment, the curing adhesive is UV curing adhesive.

[0011] In this embodiment, the reinforcement part is made of UV curing glue, which not only meets the use environment requirements of the battery cell, but also has strong plasticity, which is convenient for processing and molding when it is in liquid state. At the same time, the UV curing glue has high strength after curing, which is beneficial to improve the structural strength of the groove.

[0012] In an optional embodiment, the reinforcement portion includes a main body, which is accommodated in the groove and extends along the length direction of the groove.

[0013] In this embodiment, through this arrangement, the reinforcing effect of the reinforcing portion on the groove is ensured, and the shrinkage deformation of the groove is effectively suppressed.

[0014] In an optional embodiment, the reinforcement portion further includes a reinforcing rib, wherein the reinforcing rib is connected to the main body and extends along the width direction of the main body, and the reinforcing rib is at least partially located at the junction of the first shell and the second shell.

[0015] In this embodiment, by providing reinforcing ribs, the structural strength of the groove is further improved, which is beneficial to suppressing the shrinkage deformation of the groove in its own width direction.

[0016] In an optional embodiment, there are multiple reinforcing ribs, and the multiple reinforcing ribs are distributed at intervals along the length direction of the main body.

[0017] In this embodiment, by providing a plurality of reinforcing ribs spaced apart along the length direction of the main body, it is helpful to ensure that the structural strength of the groove at all locations along its own length direction is improved, thereby avoiding shrinkage of local areas of the groove along its own length direction.

[0018] In an optional embodiment, the main body includes a plurality of reinforcing units, and the plurality of reinforcing units are sequentially connected along the length direction of the groove.

[0019] In this embodiment, a plurality of reinforcing units are arranged and connected in sequence along the length direction of the groove to form a main body continuously distributed in the length direction of the groove, which is beneficial to ensure that the structural strength of the groove at various locations in its own length direction is improved and to avoid wrinkling in local areas of the groove in its own length direction.

[0020] In an optional embodiment, the reinforcement unit is ring-shaped.

[0021] In this embodiment, by setting the reinforcement unit in a ring shape, while ensuring the structural strength of the groove, the material usage of the reinforcement part can be reduced, thereby reducing the production cost of the battery cell. At the same time, the ring-shaped reinforcement unit is located in the groove and has a hollow area. Compared with the design of completely filling the groove with materials, the reinforcement unit occupies less space in the height direction of the battery cell, which can further reduce the impact on the thickness or height of the battery cell head.

[0022] In an optional embodiment, the reinforcement units are in a cross shape.

[0023] In this embodiment, by arranging the reinforcement unit in a cross shape, while ensuring the structural strength of the groove, the material usage of the reinforcement part can be reduced, thereby reducing the production cost of the battery cell. At the same time, the cross-shaped reinforcement unit is located in the groove. Compared with the design of completely filling the material in the groove, the reinforcement unit occupies less space in the height direction of the battery cell, thereby reducing the impact on the thickness or height of the battery cell head.

[0024] In an optional embodiment, the battery cell is a multi-pole wound battery cell or a laminated battery cell.

[0025] In a second aspect, the present application provides an electronic device, comprising the battery cell provided by any one of the embodiments of the first aspect.

[0026] The beneficial effects of the technical solution provided in the embodiment of the present application include at least: by disposing the reinforcement part at least partially on the groove wall of the groove, a local reinforcement structure is formed at the groove; during the battery cell cycle, when the electrolyte is consumed and the internal pressure of the battery cell is reduced, the reinforcement part can suppress the deformation of the groove, thereby preventing the height of the battery cell head from changing, and avoiding the battery cell from squeezing the components above it due to the increase in the height of the battery cell head. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the battery head of the battery in the initial state in the prior art;

[0029] Figure 2 It is a schematic diagram of the structure of the battery head of the battery in the prior art after a number of cycles;

[0030] Figure 3 A partial cross-sectional view of a battery cell provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of a partial structure of a battery cell provided in one of the embodiments of the present application;

[0032] Figure 5 A schematic diagram of a partial structure of a battery cell provided in the second embodiment of the present application;

[0033] Figure 6 A schematic diagram of a partial structure of a battery cell provided in the third embodiment of the present application;

[0034] Figure 7 This is a schematic diagram of the partial structure of a battery cell provided in the fourth embodiment of the present application.

[0035] The reference numerals in the figures represent respectively:

[0036] 1-first shell; 11-groove; 12-accommodating cavity; 2-second shell; 3-reinforcement part; 31-main body; 311-reinforcement unit; 32-reinforcement rib; 4-pole piece; 5-pole ear.

[0037] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally based on the relative relationship of the directions shown in the figures, and these directional nouns are used only to more clearly describe the relationship between structures, and are not intended to describe absolute directions. When the product is placed in different postures, the direction may change, for example, "upper" and "lower" may be interchangeable.

[0040] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0041] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] In conventional multi-tab wound cells or stacked cells, during the cycle, as the electrolyte is consumed, the pressure in the cavity decreases, the angle of the folded tab area at the head becomes smaller, causing the groove at the head of the cell shell to shrink, and then the height of the head of the cell shell increases. Figure 1 The figure shows the angle a between the pole piece and the pole ear and the height h1 of the head of the battery shell in the initial state of a conventional battery cell. Figure 2 The figure shows the angle b between the pole piece and the pole ear and the height h2 of the head of the battery case of a conventional battery cell after several cycles, where a>b and h1<h2.

[0043] This phenomenon may cause other components above the battery cell to be squeezed. For example, when the battery cell is used in electronic equipment, the increased height of the head of the battery cell shell may cause a top print on the display screen above the battery cell, affecting the display effect.

[0044] In order to solve the above technical problems, the embodiments of the present application provide a battery cell and an electronic device.

[0045] like Figure 3 As shown, the battery cell includes a first shell 1, a second shell 2 and a reinforcement part 3. The first shell 1 and the second shell 2 are joined. The first shell 1 is formed with a groove 11. The groove 11 is located at the adjacent side of the joint of the first shell 1 and the second shell 2. The groove 11 is recessed in the direction close to the second shell 2. The reinforcement part 3 is at least partially arranged on the groove wall of the groove 11. The reinforcement part 3 can be completely located in the groove 11, or only partially located in the groove 11; and the reinforcement part 3 can be protruding in the groove 11, or can be filled in the groove 11.

[0046] Exemplarily, the battery cell is a multi-pole wound battery cell or a laminated battery cell.

[0047] The first shell 1 and the second shell 2 are arranged to form a receiving chamber 12, and the receiving chamber 12 is used to receive electrolyte, electrode 4, etc., for example Figure 3 As shown, the battery cell further includes a pole ear 5 and a plurality of pole pieces 4 . The plurality of pole pieces 4 are stacked or wound and connected to the pole ear 5 at one end of the accommodating cavity 12 . The pole ear 5 extends from the accommodating cavity 12 to the outside of the accommodating cavity 12 .

[0048] During the manufacturing process of the battery cell, a groove 11 is formed near the joint between the first shell 1 and the second shell 2, for example Figure 3 As shown, the groove 11 is located on the first shell 1 and is concave downward. In the battery cell of the related art, as the electrolyte is consumed, the pressure in the accommodating cavity 12 decreases, the angle between the pole piece 4 and the pole ear 5 becomes smaller, causing the groove 11 to shrink, and then causing the joint of the first shell 1 and the second shell 2 to warp, and the height of the battery cell as a whole to increase. If a display screen is provided above the battery cell, the battery cell will squeeze the display screen, causing the display screen to have a top print, affecting the display effect.

[0049] The battery cell provided in the embodiment of the present application forms a local reinforcement structure at the groove 11 by at least partially disposing the reinforcement portion 3 on the groove wall of the groove 11. During the battery cell cycle, when the electrolyte is consumed and the internal pressure of the battery cell is reduced, the reinforcement portion 3 can suppress the deformation at the groove 11, thereby preventing the height of the battery cell head from changing, thereby avoiding the battery cell from squeezing the components above it due to the increase in the height of the battery cell head.

[0050] In a specific embodiment, the reinforcing part 3 is made of curing glue. Exemplarily, the reinforcing part 3 is made of curing glue such as UV curing glue, LED curing glue, epoxy glue, polyurethane glue, etc. For example, the curing glue is UV curing glue, which is also called shadowless glue, photosensitive glue, and ultraviolet light curing glue. The curing principle is that the photoinitiator (or photosensitizer) in the UV curing material absorbs ultraviolet light under the irradiation of ultraviolet light to produce active free radicals or cations, which triggers monomer polymerization and cross-linking chemical reactions, so that the adhesive is converted from liquid to solid within a few seconds. UV curing glue is a commonly used adhesive on the battery cell. By setting the reinforcing part 3 to be made of UV curing glue, it can not only meet the use environment requirements of the battery cell, but also has strong plasticity, which is convenient for processing and molding when in liquid state. At the same time, the UV curing glue has a higher strength after curing, which is conducive to improving the structural strength of the groove 11.

[0051] Exemplarily, the reinforcement part 3 is formed by using a glue dispensing and curing process. Specifically, the surface of the first shell 1 and the groove 11 are first cleaned to remove impurities such as oil, dust, etc. on the surface; then, a glue dispensing device such as a glue dispensing machine is used to perform one or more glue injections at the groove 11 to preliminarily form the reinforcement part 3; then, the reinforcement part 3 is cured under an ultraviolet lamp or ultraviolet curing device to convert the curing glue from liquid to solid. At this time, the reinforcement part 3 with a harder texture forms a local reinforcement structure, which improves the structural strength of the groove 11, making it difficult for the first shell 1 to deform at the groove 11, thereby preventing the height of the battery head from changing.

[0052] By setting the reinforcing part 3 to be made of curing glue, it has strong plasticity, is easy to shape, and has a fast curing speed, which is beneficial to improving production efficiency. It also has higher strength after curing, which is beneficial to improving the structural strength of the groove 11.

[0053] In a further embodiment, the reinforcement portion 3 includes a main body 31 , which is received in the groove 11 and extends along the length direction of the groove 11 .

[0054] like Figure 4 As shown, the length direction of the groove 11 and the main body 31 is parallel to the horizontal direction, and the width direction of the groove 11 and the main body 31 is parallel to the vertical direction.

[0055] Exemplarily, the main body 31 is accommodated in the groove 11, and the width of the main body 31 is less than or equal to the width of the groove 11, and the ratio of the length of the main body 31 to the length of the groove 11 is greater than 50%, thereby ensuring the reinforcement effect of the reinforcement part 3 on the groove 11 and effectively suppressing the shrinkage deformation of the groove 11.

[0056] Optionally, the main body 31 may be distributed continuously along the length direction of the groove 11 , or may be distributed discontinuously along the length direction of the groove 11 .

[0057] In a specific embodiment, the reinforcement portion 3 further includes a reinforcing rib 32 , which is connected to the main body 31 and extends along the width direction of the main body 31 . The reinforcing rib 32 is at least partially located at the junction of the first shell 1 and the second shell 2 .

[0058] like Figure 4 and Figure 6 As shown, the reinforcing rib 32 is perpendicular to the length direction of the main body 31 , and the reinforcing rib 32 extends toward a side close to the edge of the first shell 1 .

[0059] Among them, Figures 4 to 7 In the embodiment, the upper part of the groove 11 is the joint of the first shell 1 and the second shell 2, and the reinforcing rib 32 can be as shown in FIG. Figure 6 As shown, all are located at the junction of the first shell 1 and the second shell 2, and the reinforcing ribs 32 can also be as shown in FIG. Figure 4 As shown, one part is located at the junction of the first shell 1 and the second shell 2 , and the other part is located on a side of the main body 31 away from the edge of the first shell 1 .

[0060] In this embodiment, the reinforcement ribs 32 are provided to further improve the structural strength of the groove 11 , which is beneficial to suppress the shrinkage deformation of the groove 11 in its width direction.

[0061] Furthermore, there are multiple reinforcing ribs 32 , and the multiple reinforcing ribs 32 are spaced apart along the length direction of the main body 31 .

[0062] For example Figure 4 and Figure 6 As shown, a plurality of reinforcing ribs 32 are spaced apart in the horizontal direction.

[0063] In this embodiment, by providing a plurality of reinforcing ribs 32 spaced apart along the length direction of the main body 31 , it is beneficial to ensure that the structural strength of the groove 11 at all locations along its own length direction is improved, thereby avoiding shrinkage of the groove 11 in a local area along its own length direction.

[0064] The main body 31 includes a plurality of reinforcing units 311 , and the plurality of reinforcing units 311 are sequentially connected along the length direction of the groove 11 .

[0065] For example, Figures 5 to 7As shown, the multiple reinforcement units 311 have the same size and shape, and the multiple reinforcement units 311 are continuously connected along the length direction of the groove 11 to form a main body 31 that is continuously distributed in the length direction of the groove 11.

[0066] In this embodiment, a plurality of reinforcing units 311 are arranged and connected in sequence along the length direction of the groove 11 to form a main body 31 continuously distributed in the length direction of the groove 11, which is beneficial to ensure that the structural strength of the groove 11 at various locations in its own length direction is improved, thereby avoiding wrinkling of the local area of ​​the groove 11 in its own length direction.

[0067] In an optional embodiment, the reinforcement unit 311 is ring-shaped, and each reinforcement unit 311 has a hollow area.

[0068] Exemplarily, the strengthening unit 311 may be in the shape of a rectangular ring, a circular ring, an elliptical ring, a diamond ring, etc. Figure 7 As shown, the strengthening unit 311 is in an elliptical ring shape.

[0069] By setting the reinforcing unit 311 to be annular, while ensuring the structural strength at the groove 11, the material usage of the reinforcing portion 3 can be reduced, thereby reducing the production cost of the battery cell. At the same time, the annular reinforcing unit 311 is located in the groove 11 and has a hollow area. Compared with the design of completely filling the groove 11 with materials, the reinforcing unit 311 occupies less space in the height direction of the battery cell, thereby reducing the impact on the thickness or height of the battery cell head.

[0070] In another optional embodiment, the reinforcing units 311 are in a cross shape.

[0071] Exemplarily, the strengthening unit 311 is in a "M" shape, an "X" shape, etc. The strengthening unit 311 has a plurality of branches, and the plurality of branches form one or more intersections, for example Figure 5 and Figure 6 As shown, the reinforcing unit 311 is in an "X" shape, and each reinforcing unit 311 has a cross point.

[0072] By arranging the reinforcing unit 311 in a cross shape, while ensuring the structural strength at the groove 11, the material usage of the reinforcing portion 3 can be reduced, thereby reducing the production cost of the battery cell. At the same time, the cross-shaped reinforcing unit 311 is located in the groove 11. Compared with the design of completely filling the groove 11 with materials, the reinforcing unit 311 occupies less space in the height direction of the battery cell, thereby reducing the impact on the thickness or height of the battery cell head.

[0073] It is understandable that the reinforcing ribs 32 and the reinforcing unit 311 in the above embodiment are made by the glue dispensing and curing process, which has the advantages of fast molding, strong plasticity, and high strength after molding. Specifically, the surface of the first shell 1 and the groove 11 are first cleaned to remove impurities such as oil, dust, etc. on the surface; then, a glue dispensing device such as a glue dispensing machine is used to perform one or more glue injections at the groove 11 and / or the surface of the first shell 1; then, the glue is irradiated and cured under an ultraviolet lamp or ultraviolet curing equipment to convert the curing glue from liquid to solid.

[0074] An embodiment of the present application also provides an electronic device, comprising the battery cell provided by any of the above embodiments.

[0075] Electronic devices include but are not limited to mobile phones, tablet computers, laptops, vehicle-mounted devices, wearable devices, drones and other products. Wearable devices can be smart bracelets, smart watches, augmented reality (AR) glasses, virtual reality (VR) glasses, etc.

[0076] For example, the electronic device is a foldable electronic device. For foldable electronic devices, the mainstream development of ultra-thinness is unstoppable, which leads to the extreme space utilization in the thickness direction. The ultra-thin batteries used are more likely to cause the problem of increased battery head height, which can easily lead to a very high proportion of screen top printing and extremely serious after-sales problems.

[0077] The battery cell used in the electronic device in the embodiment of the present application forms a local reinforcement structure at the groove 11 by disposing the reinforcement part 3 at least partially on the groove wall of the groove 11. During the battery cell cycle, when the electrolyte is consumed and the internal pressure of the battery cell is reduced, the reinforcement part 3 can suppress the deformation at the groove 11, thereby preventing the height of the battery cell head from changing, avoiding the battery cell from squeezing the components above it due to the increase in the height of the battery cell head, which is beneficial to solving the problem of screen top printing and reducing the risk of batch after-sales.

[0078] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0079] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0080] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises a first shell (1), a second shell (2) and a reinforcement portion (3); the first shell (1) and the second shell (2) are joined; the first shell (1) is formed with a groove (11); the groove (11) is located adjacent to a joint between the first shell (1) and the second shell (2); the groove (11) is recessed in a direction close to the second shell (2); and the reinforcement portion (3) is at least partially arranged on a groove wall of the groove (11).

2. The battery cell according to claim 1, characterized in that: The reinforcement part (3) is made of curing glue.

3. The battery cell according to claim 2, characterized in that: The curing adhesive is UV curing adhesive.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The reinforcing portion (3) comprises a main body (31), wherein the main body (31) is accommodated in the groove (11) and extends along the length direction of the groove (11).

5. The battery cell according to claim 4, characterized in that: The reinforcement portion (3) further comprises a reinforcement rib (32), wherein the reinforcement rib (32) is connected to the main body (31) and extends along the width direction of the main body (31), and the reinforcement rib (32) is at least partially located at the junction of the first shell (1) and the second shell (2).

6. The battery cell according to claim 5, characterized in that: There are a plurality of reinforcing ribs (32), and the plurality of reinforcing ribs (32) are distributed at intervals along the length direction of the main body (31).

7. The battery cell according to claim 4, characterized in that: The main body (31) comprises a plurality of reinforcing units (311), and the plurality of reinforcing units (311) are connected in sequence along the length direction of the groove (11).

8. The battery cell according to claim 7, characterized in that: The strengthening unit (311) is ring-shaped.

9. The battery cell according to claim 7, characterized in that: The reinforcing unit (311) is in a cross shape.

10. The battery cell according to claim 1, characterized in that: The battery cell is a multi-electrode wound battery cell or a laminated battery cell.

11. An electronic device, characterized in that: The electronic device comprises the battery cell according to any one of claims 1 to 10.

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