Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment, relates to the technical field of electronics, and is used for solving the problems of poor sealing performance and large thickness. The battery comprises a bonding part, a battery cell arranged in a packaging structure, and a first tab partially located in the packaging structure. The battery cell comprises a first pole piece body and a second tab extending from one side of the first pole piece body, and the second tab is connected with the first tab. The second tab comprises an extension section, a first bending section and a first bending point for connecting the extension section and the first bending section; the bonding part is arranged on one side, far away from the first bending point, of the packaging structure, and the projection of the bonding part in the first direction of the battery is at least partially overlapped with the first bending point, so that the extension section can be inhibited from approaching the first bending section, namely, the height change of the second tab is inhibited, and thus the problem that the battery is not damaged in the circulation process is prevented. And the thickness near the second tab and the first tab exceeds the specification, so that the thickness and the sealing performance of the battery are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to a battery and an electronic device. Background Art

[0002] Polymer batteries have the advantages of high energy density, long cycle service life, and strong temperature adaptability, and are widely used in mobile phones, laptops, electric vehicles, electric ships, power tools, wearable devices and other fields. With the continuous progress of technology development, while pursuing high energy density and fast charging, electronic devices are also becoming thinner and lighter, that is, lighter in weight and thinner in thickness, which is convenient to carry, and this puts higher requirements on the battery.

[0003] The multi-tab structure is one of the ways for the battery to achieve high-rate charge and discharge. By increasing the number of tabs of the battery cell, high-rate charge and discharge can be achieved, and the temperature will not rise too fast under high-rate use conditions, making the application of batteries with multi-tab structures more and more common. The multi-tab structure includes a plurality of first tabs stacked on top of each other, and a second tab connected to the first tab. Usually, the first tab and the second tab need to be bent once.

[0004] However, the above tab structure often protrudes from the battery cell, which is likely to have an adverse impact on the sealing performance and thickness of the battery. Summary of the Utility Model

[0005] In view of the above problems, embodiments of the present utility model provide a battery and an electronic device for improving the sealing performance of the battery and reducing the thickness of the battery.

[0006] To achieve the above object, the embodiments of the present utility model provide the following technical solutions:

[0007] A first aspect of an embodiment of the present utility model provides a battery, including: a packaging structure, an adhesive part, a battery cell disposed in the packaging structure, and a first tab partially located in the packaging structure; the battery cell includes a first tab body and a second tab extending from one side of the first tab body; the second tab is connected to the first tab;

[0008] The second tab includes an extension section, a first bending section, and a first bending point connecting the extension section and the first bending section;

[0009] The adhesive part is disposed on a side of the packaging structure away from the first bending point, and a projection of the adhesive part in a first direction of the battery at least partially overlaps with the first bending point.

[0010] In some possible embodiments, the adhesive part covers a part of the inner surface of the packaging structure, and / or, the adhesive part covers a part of the outer surface of the packaging structure.

[0011] In some possible embodiments, along the second direction of the battery, the orthographic projection of the bonding portion overlaps at least a partial area of the first tab, and the second direction intersects with the first direction; and / or,

[0012] Along the first direction of the battery, the orthographic projection of the bonding portion does not overlap with the first electrode tab body of the battery cell.

[0013] In some possible embodiments, the ratio of the thickness of the bonding portion to the thickness of the battery cell is 0.01 - 0.5, and / or,

[0014] The thickness of the bonding portion is greater than or equal to 0.2 mm; and / or,

[0015] The ratio of the height of the bonding portion to the height of the encapsulation structure is 0.006 - 0.3, and / or,

[0016] The height of the bonding portion is greater than 1 mm.

[0017] The encapsulation structure includes a first face and a second face oppositely arranged along the first direction of the battery, and a side face connecting the first face and the second face;

[0018] The encapsulation structure further includes a sealing portion connected to the first tab;

[0019] In the first direction of the battery, the distance between the first face and the sealing portion is less than the distance between the sealing portion and the second face;

[0020] The first face has a recessed portion recessed toward the second face, and the bonding portion is disposed within the recessed portion and / or on the surface of the recessed portion facing the battery cell.

[0021] In some possible embodiments, the first tab includes a connecting segment connected to the first bending segment of the second tab, a second bending segment, and a second bending point connecting the connecting segment and the second bending segment;

[0022] The extending segment of the second tab includes a third bending point bent in a direction away from the bonding portion;

[0023] In the third direction of the battery, the bonding portion is located between the third bending point and the second bending point.

[0024] In some possible embodiments, there is an arc transition between the second face and the adjacent sealing portion, and the projection of the bonding portion overlaps at least partially with the arc.

[0025] In some possible embodiments, the depth of the recessed portion is greater than or equal to 1 mm; and / or,

[0026] The width of the recess is greater than or equal to 1 mm;

[0027] The top surface of the recess does not exceed the top surface of the first face; and / or,

[0028] The first bent section of the second tab is connected to the first tab, and the angle between the first bent section and the plane where the second face is located is greater than 90°.

[0029] In some possible embodiments, the battery includes two first tabs, and the first tabs are arranged at intervals along the second direction of the battery;

[0030] Both ends of the bonding part extend outwards from one ends of the two first tabs away from each other;

[0031] Alternatively, there are two bonding parts, and the two bonding parts respectively correspond to the two first tabs, and both ends of each bonding part extend outwards from both ends of the corresponding first tab.

[0032] The battery in the embodiment of the present invention includes a packaging structure, a bonding part, a battery cell arranged in the packaging structure, and a first tab partially located in the packaging structure. Among them, the battery cell includes a first tab body and a second tab extending from one side of the first tab body, and the second tab is connected to the first tab. The second tab includes an extending section, a first bent section, and a first bending point connecting the extending section and the first bent section, so as to reduce the size of the second tab in the first direction of the battery and avoid the second tab protruding, thereby improving the energy density of the battery. The bonding part is arranged on one side of the packaging structure away from the first bending point, and the projection of the bonding part in the first direction of the battery at least partially overlaps with the first bending point, which can inhibit the extending section and the first bent section from approaching each other, that is, inhibit the height change of the second tab, thereby preventing the thickness near the second tab and the first tab from exceeding the specification during the cycle, so as to ensure the thickness and sealing performance of the battery.

[0033] The second aspect of the embodiment of the present invention provides an electronic device, including the battery as described above, and thus has at least the advantages of good sealing performance and small thickness. For specific effects, refer to the above, and details are not described herein again.

[0034] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, the other technical problems that can be solved by the battery and the electronic device provided by the embodiments of the present invention, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a cross-sectional view of a position of the battery in the embodiment of the present invention;

[0037] Figure 2 It is a cross-sectional view of another position of the battery in the embodiment of the present invention;

[0038] Figure 3 It is an exploded view of the encapsulation structure in the embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of the recessed part in the embodiment of the present invention;

[0040] Figure 5 It is a schematic diagram of a position of the bonding part in the embodiment of the present invention;

[0041] Figure 6 It is another schematic diagram of a position of the bonding part in the embodiment of the present invention;

[0042] Figure 7 It is the first structural diagram of the bonding part in the embodiment of the present invention;

[0043] Figure 8 It is the second structural diagram of the bonding part in the embodiment of the present invention;

[0044] Figure 9 It is the third structural diagram of the bonding part in the embodiment of the present invention;

[0045] Figure 10 It is the fourth structural diagram of the bonding part in the embodiment of the present invention.

[0046] Explanation of reference numerals:

[0047] 10 - First pole piece body; 20 - Second pole piece body;

[0048] 30 - Separator; 40 - Second tab;

[0049] 50 - First tab; 51 - Connection section;

[0050] 52 - Second bending section; 60 - Encapsulation structure;

[0051] 61 - First face; 62 - Second face;

[0052] 63 - Side face; 64 - Arc;

[0053] 65 - Concave part; 70 - Bonding part. Specific embodiments

[0054] In the related art, there are problems of poor sealing performance and large thickness. After research by the inventor, it is found that the reason is as follows: After the first tab and the second tab are bent, they will not exceed the thickness of the battery cell, which can ensure the energy density of the battery. The angle between the overlapping part of the second tab and the first tab and the horizontal plane is an obtuse angle. However, as the electrolyte is consumed, the internal pressure of the battery becomes smaller, and the external atmospheric pressure presses the battery, etc. The first tab and the second tab move towards the direction of the battery cell. The above angle gradually becomes a right angle or even an acute angle, so that the height of the first tab and the second tab exceeds the thickness of the battery cell, increasing the thickness of the battery and causing the outer surface (i.e., the packaging structure) of the battery to be subjected to a large force, prone to corner cracking problems, and affecting the sealing performance.

[0055] To solve the technical problems, an embodiment of the present utility model provides a battery, which includes a packaging structure, a bonding part, a battery cell disposed in the packaging structure, and a first tab partially located in the packaging structure. The battery cell includes a first tab body and a second tab extending from one side of the first tab body, and the second tab is connected to the first tab. The second tab includes an extension section, a first bending section, and a first bending point connecting the extension section and the first bending section. The bonding part is disposed on a side of the packaging structure away from the first bending point, and the projection of the bonding part in the first direction of the battery at least partially overlaps with the first bending point, which can inhibit the extension section and the first bending section from approaching, that is, inhibit the height change of the second tab, so as to prevent the thickness near the second tab and the first tab from exceeding the specification during the cycle, and ensure the thickness and sealing performance of the battery.

[0056] In order to make the above objects, features, and advantages of the embodiments of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0057] An embodiment of the present utility model provides an electronic device, which can be a television, an electronic watch, an e-book, a desktop computer, a laptop computer, a tablet computer, a mobile phone, an AR device (Augmented Reality), a VR device (Virtual Reality), etc., and can also be an electric vehicle, an electric ship, an electric tool, etc.

[0058] The electronic device includes a battery, which refers to a device that can convert chemical energy into electrical energy. The battery can be a polymer battery. For example, the battery can be a lithium-ion power battery, which has advantages such as high energy density, low self-discharge, and good discharge performance. The battery can also be a sodium-ion battery or a sodium-lithium-ion battery.

[0059] Refer to Figures 1 to 10 , the battery includes a packaging structure 60, a battery cell, an adhesive part 70, and a first tab 50. The battery cell is disposed within the packaging structure 60, and a part of the first tab 50 is located within the packaging structure 60, and the other part can extend outside the packaging structure 60. The adhesive part 70 can be disposed within the packaging structure 60 or outside the packaging structure 60.

[0060] The battery cell is the main part for storing and releasing electrical energy and is the core component of the battery. The battery cell can be a wound core, that is, the battery cell is a wound structure. In other examples, the battery cell can also be a stacked core, that is, the battery cell is a stacked structure. The battery cell includes a first electrode sheet body 10 and a second tab 40, and the second tab 40 extends from one side of the first electrode sheet body 10, and the second tab 40 is connected to the first tab 50. The first electrode sheet body 10 can be a positive electrode sheet.

[0061] The battery cell further includes a second electrode sheet body 20 and a separator 30. The second electrode sheet body 20 is alternately arranged with the first electrode sheet body 10, and the second electrode sheet body 20 can be a negative electrode sheet. The separator 30 is located between the adjacent second electrode sheet body 20 and the first electrode sheet body 10. When the battery cell works, active ions (such as lithium ions) are embedded and extracted back and forth between the first electrode sheet body 10 and the second electrode sheet body 20, and the separator 30 is used to prevent the first electrode sheet body 10 and the second electrode sheet body 20 from short-circuiting and can allow the active ions to pass through.

[0062] Wherein, a second tab 40 also extends from one side of the second electrode sheet body 20, and there are at least two second tabs 40, that is, there are two or more second tabs 40. There are at least two first tabs 50, that is, there are two or more first tabs 50, and at least two first tabs 50 are arranged at intervals along the second direction of the battery to avoid short-circuiting of the battery. The second direction of the battery intersects with the first direction, wherein the second direction of the battery can be the width direction of the battery, as Figure 7 shown by the X direction in

[0063] Such as Figure 1As shown, a part of the second tab 40 is connected to the first electrode tab body 10 of the battery cell, and this part of the second tab 40 is correspondingly connected to a first tab 50. As Figure 2 shown, another part of the second tab 40 is connected to the second electrode tab body 20 of the battery cell, and this part of the second tab 40 is correspondingly connected to another first tab 50, so as to externally connect the first electrode tab body 10 and the second electrode tab body 20 in the battery cell respectively, thereby realizing providing electrical energy for the electronic device.

[0064] In some possible examples, the second tab 40 includes an extension section, a first bending section, and a first bending point connecting the extension section and the first bending section. By bending the second tab 40, the size of the battery in the first direction can be reduced, thereby improving the energy density of the battery. Among them, the first bending point is as Figure 4 shown at point A in, and the first direction can be the thickness direction of the battery, and the thickness of the battery is as Figure 1 shown at T3 in.

[0065] The extension section is connected to the battery cell, the first bending section is connected to the first tab 50, and the second tab 40 is made of copper foil or aluminum foil, so that the second tab 40 is softer and is convenient for bending and connection. Specifically, one end of the extension section ( Figure 1 the left end shown in) is connected to the battery cell. The other end of the extension section ( Figure 1 the right end shown in) is connected to one end of the first bending section ( Figure 1 the left end shown in) through the first bending point. For example, the extension section, the first bending section and the first bending point can be an integral structure. The other end of the first bending section ( Figure 1 the right end shown in) is connected to the first tab 50. Among them, the extension section also has a third bending point, and the third bending point is as Figure 4 shown at point C in.

[0066] Continue to refer to Figures 1 to 10 , the first tab 50 includes a connection section 51, a second bending section 52 and a second bending point. The connection section 51 is connected to the first bending section, and is connected to the second bending section 52 through the second bending point. The second bending point is as Figure 4 shown at point B in. By bending the first tab 50, the size of the first tab 50 in the first direction of the battery is reduced, and the first tab 50 is prevented from protruding, thereby improving the energy density of the battery.

[0067] The connection section 51 is connected to the second tab 40, and the end of the second bending section 52 away from the connection section 51 extends outside the encapsulation structure 60. The first tab 50 is made of aluminum, nickel or nickel-plated copper, etc., so that the first tab 50 has a certain hardness and is not easily deformed.

[0068] Continue to refer to Figures 1 to 10, the encapsulation structure 60 is used to encapsulate the battery cell, and the encapsulation structure 60 has an accommodation space. The battery cell and the second tab 40 are both located in the accommodation space. A part of the first tab 50 is located in the accommodation space, and the other part of the first tab 50 extends outside the encapsulation structure 60 to be exposed outside the encapsulation structure 60.

[0069] Wherein, the first tab 50 is hermetically connected to the encapsulation structure 60 to ensure the sealing performance of the encapsulation structure 60. For example, the first tab 50 is fixedly connected to the encapsulation structure 60 through tab glue. Exemplarily, the encapsulation structure 60 can be an aluminum-plastic film, and the aluminum-plastic film, tab glue and the first tab 50 are fixedly connected through a heat-sealing process.

[0070] In some possible examples, the encapsulation structure 60 includes a first face 61 and a second face 62 that are oppositely arranged along the first direction of the battery, and a side face 63 that connects the first face 61 and the second face 62. Wherein, the first direction of the battery is the same as the first direction of the battery cell, and the first face 61 and the second face 62 face the large faces of the battery cell.

[0071] The encapsulation structure 60 further includes a sealing part, and the sealing part is connected to the first tab. In the first direction of the battery, the distance between the sealing part and the first face 61 is less than the distance between the sealing part and the second face 62. That is, the first face 61 is close to the sealing part, and the second face 62 is far from the sealing part. As Figure 1 shown, the first face 61 is located above the second face 62.

[0072] The side face 63 circumferentially surrounds the battery cell, and the side face 63 adjacent to the first tab 50 conformally covers a part of the surface where the second bent section 52 contacts the sealing part. There is an arc 64 transition between the second face 62 and the side face 63 adjacent to the sealing part. As Figure 2 shown, there is an arc 64 transition between the second face 62 and the right side face 63.

[0073] Wherein, the included angle between the plane where the second face 62 is located and the first bent section is greater than 90°. As Figure 4 shown, a > 90°, in this way, it is convenient to place a thinner battery cell to form an ultra-thin battery, avoid the first tab 50 exceeding the total thickness of the battery cell, and ensure the energy density.

[0074] In some possible examples, the first face 61 has a recess 65 that is concave toward the second face 62, and the recess 65 is located between the second tab 40 and the first tab 50. The recess 65 can be formed by stamping. As Figure 3 shown, the recess 65 can be punched out at the top of the corresponding surface of the aluminum-plastic film when the aluminum-plastic film is stamped. The top surface of the recess 65 does not exceed the top surface of the first face 61, and the top surface of the first face 61 refers to the surface of the first face 61 that faces away from the second face 62.

[0075] The depth of the recess 65 is greater than or equal to 1 mm, and the width of the recess 65 is greater than or equal to 1 mm. Among them, the depth direction of the recess 65 is consistent with the first direction of the battery, the width direction of the recess 65 is consistent with the third direction of the battery, and the length direction of the recess 65 can be consistent with the second direction of the battery. For example, the depth direction of the recess 65 is the thickness direction of the battery, the second direction of the recess 65 is the length direction (height direction) of the battery, and the third direction of the recess 65 is the width direction of the battery. In the embodiments of the present application, the length of the recess 65 is not limited. The length of the recess 65 can be the same as the width of the battery cell or less than the width of the battery cell, and it is set according to needs.

[0076] Continue to refer to Figures 1 to 10 , the bonding portion 70 is provided on the side of the encapsulation structure 60 away from the first bending point, and the projection of the bonding portion 70 in the second direction of the battery at least partially overlaps with the first bending point. In this way, the bonding portion 70 is opposite to the first bending point, which can inhibit the extension section and the first bending section from approaching each other, thereby preventing the angle a from becoming smaller during the cycling process, further avoiding the head thickness H of the battery exceeding the specification, avoiding the battery from pressing the screen or having poor bonding at this place, and ensuring the sealing performance of the battery.

[0077] In the example where the extension section includes a third bending point, the third bending point bends away from the bonding portion 70. In the length direction of the battery, the bonding portion is located between the third bending point and the second bending point. In this way, both ends of the bonding portion 70 do not exceed the third bending point and the second bending point, which is convenient to ensure the setting of the bonding portion 70.

[0078] Among them, the bonding portion 70 can be glue or adhesive tape, and the connection with the encapsulation structure 60 is realized by dispensing or pasting. The bonding portion 70 can also be other substances that inhibit deformation, so as to cure the corresponding area of the encapsulation structure 60 and inhibit the change of the second pole ear 40. The total thickness of the bonding portion 70 and the encapsulation structure 60 does not exceed the total thickness of other areas, so as to avoid having an adverse effect on the thickness of the battery.

[0079] In some possible examples, along the first direction of the battery, the bonding portion 70 is located beside the battery cell, and the orthographic projection of the bonding portion 70 does not overlap with the first pole piece body 10 of the battery cell. As Figure 1 and Figure 2 shown, along the Z direction (thickness direction), the orthographic projection of the bonding portion 70 intersects with the first pole piece body 10 of the battery cell, that is, along the length direction, the bonding portion 70 is located beside the first pole piece body 10 and does not extend above the first pole piece body 10, so as to prevent affecting the thickness of the battery and ensure the energy density of the battery.

[0080] Among them, the edges of the second electrode tab body 20 and the first electrode tab body 10 are not aligned, and the orthographic projection of the bonding portion 70 may partially overlap with the second electrode tab body 20. Preferably, the bonding portion 70 does not overlap with either the second electrode tab body 20 or the first electrode tab body 10 to ensure that the bonding portion 70 functions well.

[0081] The bonding portion 70 covers a part of the inner surface of the encapsulation structure 60, or covers a part of the outer surface of the encapsulation structure 60, or covers both a part of the inner surface and a part of the outer surface of the encapsulation structure 60. Among them, as Figure 6 shown, the bonding portion 70 may be disposed inside the encapsulation structure 60, adjacent to the battery cell. As Figure 5 shown, the bonding portion 70 may also be disposed outside the encapsulation structure 60, isolated from the battery cell. The bonding portion 70 may also be partially disposed inside the encapsulation structure 60 and partially disposed outside the encapsulation structure 60, and these two parts are independent of each other and opposite.

[0082] In an example where the encapsulation structure 60 has a recessed portion 65, the bonding portion 70 is disposed inside the recessed portion 65 and / or on the surface of the recessed portion 65 facing the battery cell. As Figure 5 shown, the bonding portion 70 is disposed on the inner surface of the recessed portion 65, and the height of the bonding portion 70 does not exceed the depth of the recessed portion 65. For example, the bonding portion 70 fills the recessed portion 65 to reduce the total thickness of the bonding portion 70 and the encapsulation structure 60 at this location. As Figure 6 shown, the bonding portion 70 is disposed on the surface of the recessed portion 65 facing the battery cell (i.e., the outer surface of the recessed portion 65), and both ends of the bonding portion 70 may extend to both sides of the recessed portion 65.

[0083] In an example where the encapsulation structure 60 has an arc 64 (i.e., an arc 64 transition between the second surface portion 62 and the side surface portion 63), the bonding portion 70 is at least partially aligned with the arc 64. As Figure 4 shown, the projection of the bonding portion 70 in the Z direction at least partially overlaps with the arc 64, which can better inhibit the first tab 50 from approaching the battery cell, that is, inhibit deformation a, thereby preventing the first tab 50 from exceeding the battery cell.

[0084] Continuing to refer to Figure 1 , the ratio of the thickness T1 of the bonding portion 70 to the thickness T2 of the bonding portion 70 and the battery cell is 0.01 - 0.5, and the thickness T1 of the bonding portion 70 is greater than or equal to 0.2 mm. And / or, the ratio of the height of the bonding portion 70 to the height of the encapsulation structure 60 is 0.006 - 0.3, and the height of the bonding portion 70 is greater than 1 mm. Among them, the first direction of the bonding portion 70 is consistent with the thickness direction of the battery, as Figure 1 shown in the Z direction in Figure 7As shown in the Y direction in the figure.

[0085] Specifically, the thickness T1 of the bonding portion 70 is greater than or equal to 0.05 mm. Further, the thickness T1 of the bonding portion 70 is greater than or equal to 0.2 mm, and its effect of resisting deformation is better. As Figure 7 shown, the height L1 of the bonding portion 70 is greater than or equal to 0.5 mm. Further, the height L1 of the bonding portion 70 is greater than or equal to 1 mm, and its effect of resisting deformation is better.

[0086] In some possible examples, along the second direction of the battery, the orthographic projection of the bonding portion 70 overlaps at least a partial area of the first tab 50. As Figures 7 to 10 shown, the bonding portion 70 intersects with the first tab 50 to ensure the suppression effect of the bonding portion 70 on the change of the second tab 40. The bonding portion 70 may be provided at other positions or may not be provided. The embodiments of the present application are not limited thereto.

[0087] In some possible implementation manners, there is one bonding portion 70, and both ends of the bonding portion 70 respectively extend out of one end of the two first tabs 50 away from each other. As Figures 8 to 10 shown, the bonding portion 70 is relatively long and continuous along the second direction of the battery. The left end of the bonding portion 70 extends to the left side of the left first tab 50, and the right end of the bonding portion 70 extends to the right side of the right first tab 50, so that the area where the bonding portion 70 faces the two first tabs 50 is relatively large.

[0088] In some other possible implementation manners, there are two bonding portions, and the two bonding portions respectively correspond to the two first tabs. Both ends of each bonding portion respectively extend out of both ends of the corresponding first tab. As Figure 2 shown, the two bonding portions are arranged at intervals along the second direction of the battery, and each bonding portion corresponds to one first tab. Along the second direction of the battery, the size of each bonding portion is greater than the size of the corresponding first tab, so that both ends of the bonding portion respectively extend out of both ends of the corresponding first tab.

[0089] In the above two implementation manners, the bonding portion 70 may be strip-shaped, comb-shaped, or the bonding portion 70 includes a plurality of quadrilaterals connected in sequence along the second direction of the battery. For example, the bonding portion 70 includes a plurality of diamond rings, and the diagonals of these diamond rings are connected in sequence along the second direction of the battery. Among them, when the bonding portion 70 is strip-shaped, it is convenient to manufacture.

[0090] Exemplarily, as Figure 8 shown, there is one bonding portion 70, and this bonding portion 70 is strip-shaped. As Figure 9As shown, the bonding part 70 has one. The bonding part 70 is in a comb shape, which includes a connecting part and tooth parts arranged on one side of the connecting part. The space between two adjacent tooth parts can be opposite to the first tab 50. Of course, the tooth parts can also be opposite to the first tab 50. As Figure 10 shown, the bonding part 70 has one. The bonding part 70 includes a plurality of diamond rings connected in sequence. The above-mentioned bonding parts 70 are all relatively long to improve their effect of resisting deformation.

[0091] In summary, the battery in the embodiment of the present application includes a packaging structure 60, a battery cell, a bonding part 70 and a first tab 50. The battery cell is arranged in the packaging structure 60, and part of the first tab 50 is located in the packaging structure 60. The battery cell includes a first electrode tab body 10 and a second tab 40 extending from one side of the first electrode tab body 10. The second tab 40 is connected to the first tab 50 to realize the external connection of the battery cell. The second tab 40 includes an extension section, a first bending section and a first bending point connecting the extension section and the first bending section. The bonding part 70 is arranged on the side of the packaging structure 60 away from the first bending point, and its projection in the first direction of the battery overlaps at least partially with the first bending point, so as to inhibit the extension section and the first bending section from approaching, that is, to inhibit the height change of the second tab 40, and prevent the thickness near the second tab 40 and the first tab 50 from exceeding the specification during the cycle, thereby ensuring the thickness and sealing performance of the battery.

[0092] In this specification, the embodiments or implementation manners are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0093] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation to the present invention.

[0094] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A battery, characterized in that: include: A packaging structure, a bonding portion, a battery cell disposed in the packaging structure, and a first pole lug partially located in the packaging structure; the battery cell comprises a first pole piece body and a second pole lug extending from one side of the first pole piece body; the second pole lug is connected to the first pole lug; The second pole ear comprises an extension section, a first bending section and a first bending point connecting the extension section and the first bending section; The adhesive portion is disposed on a side of the packaging structure away from the first bending point, and a projection of the adhesive portion in the first direction of the battery at least partially overlaps with the first bending point.

2. The battery according to claim 1, characterized in that The adhesive portion covers a portion of the inner surface of the packaging structure, and / or the adhesive portion covers a portion of the outer surface of the packaging structure.

3. The battery according to claim 1, characterized in that Along a second direction of the battery, the orthographic projection of the bonding portion overlaps at least partially with the first electrode tab, and the second direction intersects with the first direction; and / or, Along the first direction of the battery, the orthographic projection of the bonding portion does not overlap with the first pole piece body of the battery cell.

4. The battery according to claim 1, characterized in that The ratio of the thickness of the bonding portion to the thickness of the battery core is 0.01-0.5; and / or, The thickness of the bonding portion is greater than or equal to 0.2 mm; and / or, The ratio of the height of the bonding portion to the height of the packaging structure is 0.006-0.3; and / or, The height of the bonding portion is greater than 1 mm.

5. The battery according to any one of claims 1 to 4, characterized in that: The packaging structure includes a first face portion and a second face portion that are arranged opposite to each other along a first direction of the battery, and a side portion connecting the first face portion and the second face portion; The packaging structure further includes a sealing portion connected to the first electrode tab; In a first direction of the battery, a distance between the first surface and the sealing portion is smaller than a distance between the sealing portion and the second surface; The first surface has a recessed portion that is recessed toward the second surface, and the adhesive portion is disposed in the recessed portion and / or on a surface of the recessed portion that faces the battery cell.

6. The battery according to claim 5, characterized in that The first pole lug includes a connecting section connected to the first bending section of the second pole lug, a second bending section, and a second bending point connecting the connecting section and the second bending section; The extension section of the second pole tab includes a third bending point bent in a direction away from the bonding portion; In the third direction of the battery, the bonding portion is located between the third bending point and the second bending point.

7. The battery according to claim 5, characterized in that There is an arc transition between the second surface portion and the adjacent sealing portion, and the projection of the bonding portion at least partially overlaps with the arc; and / or, The depth of the recessed portion is greater than or equal to 1 mm; and / or, The width of the recessed portion is greater than or equal to 1 mm; The top surface of the recessed portion does not exceed the top surface of the first surface portion; and / or, The first bending section of the second pole tab is connected to the first pole tab, and an angle between the first bending section and a plane where the second surface portion is located is greater than 90°.

8. The battery according to any one of claims 1 to 4, characterized in that: The battery comprises two first pole tabs, and the first pole tabs are arranged at intervals along the second direction of the battery; Two ends of the bonding portion extend outward from ends of the two first electrode tabs that are away from each other; Alternatively, there are two bonding portions, the two bonding portions correspond to two first electrode tabs respectively, and two ends of each bonding portion extend outward from two ends of the corresponding first electrode tab respectively.

9. The battery according to claim 8, characterized in that The bonding portion is in a strip shape or a comb shape, or the bonding portion includes a plurality of quadrilaterals sequentially connected along the second direction of the battery.

10. An electronic device, characterized in that: A battery comprising any one of claims 1 to 9.

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