Battery and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery and a battery device, the battery comprises a roll core and an ending adhesive tape, the roll core comprises a roll core body, the roll core body comprises a positive plate, a negative plate and a diaphragm, the diaphragm comprises an ending diaphragm, and the ending diaphragm is wound on the outer sides of the positive plate and the negative plate; the ending adhesive tape is adhered to the ending diaphragm and is used for fixing the ending diaphragm on the outer surface of the roll core body; the winding core body comprises two opposite first side faces in the winding axial direction of the winding core body, the distance between the ending adhesive tape and the first side faces in the winding axial direction of the winding core body is a, the height of the winding core body in the winding axial direction of the winding core body is b, and a / b is 10%-25%. According to the battery, the roll core can be conveniently disassembled.

Description

Technical Field

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

[0002] The tail end of the core is usually fixed by a tail tape. However, when the core is disassembled, it is difficult for the clamp to grasp the tail end of the core.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a battery, which can solve the technical problem that the winding core is difficult to disassemble.

[0005] Battery Included:

[0006] The winding core includes a winding core body, the winding core body includes a positive electrode sheet, a negative electrode sheet, and a separator, and the separator includes a tail separator, and the tail separator is wound on the outside of the positive electrode sheet and the negative electrode sheet;

[0007] A tail tape is bonded to the tail diaphragm and is used to fix the tail diaphragm to the outer surface of the winding core body;

[0008] The core body includes two first side surfaces opposite to each other in the winding axis direction. The distance between the tail tape and the first side surfaces in the winding axis direction of the core body is a. The height of the core body in the winding axis direction is b. A / b is 10%-25%.

[0009] In the present invention, if a / b is too large, a is too large, and the fixing effect of the tail tape on the tail diaphragm is weak; if a / b is too small, a is too small, and the clamping claws are not easy to grasp the area of ​​the tail diaphragm that is not attached by the tail tape. The present invention sets a / b to a suitable size, which can not only ensure the fixing strength of the tail diaphragm, but also make it easier for the clamping claws to grasp the area of ​​the tail diaphragm that is not attached by the tail tape, so as to facilitate the clamping claws to peel off and disassemble the diaphragm from the winding tail end of the tail diaphragm that is not attached by the tail tape.

[0010] The utility model also provides a battery device, which comprises the battery mentioned above.

[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0013] in:

[0014] Figure 1 This is a schematic diagram of the structure of a winding core in an exemplary embodiment of a battery disclosed herein;

[0015] Figure 2 A schematic structural diagram of a winding core in an exemplary embodiment of a battery disclosed herein from another perspective;

[0016] Figure 3 It is a schematic diagram of the structure of a flattened winding core in an exemplary embodiment of a battery disclosed herein.

[0017] Description of reference numerals:

[0018] 1. winding core; 11. winding core body; 111. first side surface; 112. large surface; 113. arc-shaped curved surface; 12. pole ear; 21. positive electrode sheet; 22. negative electrode sheet; 23. diaphragm; 231. finishing diaphragm; 2311. winding tail end; 3. finishing tape; 31. first side edge; 32. second side edge. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0020] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0021] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0023] like Figure 1-3 As shown, Figure 1 This is a schematic diagram of the structure of a winding core in an exemplary embodiment of a battery disclosed herein. Figure 2 This is a schematic structural diagram of a winding core from another perspective in an exemplary embodiment of the battery disclosed herein. Figure 3 It is a schematic diagram of the structure of a flattened winding core in an exemplary embodiment of a battery disclosed herein.

[0024] The battery includes: a winding core 1 and a closing tape 3. The winding core 1 includes a winding core body 11, the winding core body 11 includes a positive electrode sheet 21, a negative electrode sheet 22, and a separator 23, the separator 23 includes a closing separator 231, and the closing separator 231 is wound on the outer sides of the positive electrode sheet 21 and the negative electrode sheet 22; the closing tape 3 is bonded to the closing separator 231, and is used to fix the closing separator 231 on the outer surface of the winding core body 11; the winding core body 11 includes two first side surfaces 111 opposite to each other in the winding axial direction Y thereof, the distance between the closing tape 3 and the first side surface 111 in the winding axial direction Y of the winding core body 11 is a, the height of the winding core body 11 in the winding axial direction Y thereof is b, and a / b is 10%-25%.

[0025] In this exemplary embodiment, a / b is too large, a is too large, and the fixing effect of the closing tape 3 on the closing diaphragm 231 is weak; a / b is too small, a is too small, and the clamping claws are not easy to grasp the area of ​​the closing diaphragm 231 that is not attached by the closing tape 3. In this exemplary embodiment, a / b is set to a suitable size, which can ensure the fixing strength of the closing diaphragm 231 and also make it easier for the clamping claws to grasp the area of ​​the closing diaphragm 231 that is not attached by the closing tape, thereby facilitating the disassembly of the core.

[0026] In this exemplary embodiment, a / b may be equal to 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc.

[0027] It should be noted that when the core is wound, after the positive and negative electrode sheets are wound, the diaphragm will continue to be wound for a certain number of turns. After the positive and negative electrode sheets are wound, the diaphragm wound on the outside of the positive and negative electrode sheets forms a closing diaphragm. The distance between the closing tape 3 and the first side surface 111 on the winding axis Y of the core body 11 can be: the distance between the closing tape 3 and the upper first side surface 111 on the winding axis Y of the core body 11, or it can be: the distance between the closing tape 3 and the lower first side surface 111 on the winding axis Y of the core body 11.

[0028] In this exemplary embodiment, Figure 1-3 As shown, the bonding strength between the tail diaphragm 231 and its inner diaphragm 23 is 0.05N / cm to 0.1N / cm. For example, the bonding strength between the tail diaphragm 231 and its inner diaphragm 23 can be equal to 0.05N / cm, 0.06N / cm, 0.07N / cm, 0.08N / cm, 0.09N / cm, 0.1N / cm, etc. If the bonding strength between the tail diaphragm 231 and its inner diaphragm 23 is too small, the binding force of the tail diaphragm 231 on the inner pole piece, diaphragm and other structures is weak; if the bonding strength between the tail diaphragm 231 and its inner diaphragm 23 is too large, the tail diaphragm 231 is not easy to peel off from the inner diaphragm. In this exemplary embodiment, the bonding strength between the tail diaphragm 231 and its inner diaphragm 23 is set to an appropriate size, which can not only ensure the structural stability of the winding core, but also facilitate the disassembly of the winding core.

[0029] In this exemplary embodiment, Figure 1-3 As shown, the roughness of the surface of the diaphragm 23 is 0.2 μm-5 μm. For example, the roughness of the surface of the diaphragm 23 can be equal to 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm, 3 μm, 3.2 μm, 3.4 μm, 3.6 μm, 3.8 μm, 4 μm, 4.2 μm, 4.4 μm, 4.6 μm, 4.8 μm, 5 μm, etc. If the roughness of the surface of the diaphragm 23 is too large, the tail diaphragm 231 is not easy to be peeled off from the inside; if the roughness of the surface of the diaphragm 23 is too small, the clamping jaws are not easy to clamp the tail diaphragm 231. In this exemplary embodiment, the roughness of the surface of the diaphragm 23 is set to a suitable size, which can facilitate the clamping of the finishing diaphragm 231 by the clamping jaws and also facilitate the peeling of the finishing diaphragm 231 from the lower layer.

[0030] In this exemplary embodiment, Figure 1-3 As shown, the winding core 1 may also include a pole ear 12, which is connected to the winding core body 11. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer located on at least one side of the positive electrode collector, and the negative electrode sheet may include a negative electrode collector and a negative electrode active material layer located on at least one side of the negative electrode collector. The pole ear includes a positive pole ear and a negative pole ear, and the positive pole ear is connected to the positive electrode collector in the positive electrode sheet. For example, the positive pole ear can be formed by cutting the positive electrode collector material layer; the negative pole ear is connected to the negative electrode collector in the negative electrode sheet. For example, the negative pole ear can be formed by cutting the negative electrode collector material layer. The positive electrode active material of the lithium-ion battery can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode active material can be graphite, silicon, etc. During charging, lithium ions are separated from the positive electrode active material, move to the negative electrode active material through the electrolyte, and the lithium ions are embedded in the interlayer gaps of the carbon material to complete the battery charging process. During discharge, lithium ions are separated from the negative electrode active material and move to the positive electrode active material through the electrolyte, completing the discharge process of the battery.

[0031] In this exemplary embodiment, Figure 1-3 As shown, the core body 11 has a length direction X, a height direction, and a thickness direction. The height direction of the core body 11 is the winding axis of the core body, the thickness direction of the core body 11 is the direction perpendicular to the largest side of the core body 11, and the length direction X of the core body 11 is the direction perpendicular to the height direction and the thickness direction of the core body.

[0032] In this exemplary embodiment, Figure 1-3 As shown, the core body 11 includes a length direction X perpendicular to its winding axis Y, the size of the core body 11 in its length direction X is d, the extension size of the end tape 3 perpendicular to the winding axis Y of the core body 11 is c, and c / d is 15%-20%. For example, c / d can be equal to 15%, 16%, 17%, 18%, 19%, 20%, etc. If c / d is too large, c is too large, the bonding size between the end tape 3 and the outer surface of the core body 11 is too large, which is not conducive to the disassembly of the core and wastes the end tape 3; if c / d is too small, c is too small, the fixing effect of the end tape on the end diaphragm 231 is weak. This exemplary embodiment sets c / d to a suitable size, which can not only ensure the fixing effect of the end tape 3 on the end diaphragm 231, but also facilitate the disassembly of the core and save the end tape 3.

[0033] It should be noted that the extension dimension of the closing tape 3 perpendicular to the winding axis Y of the core body 11 is the dimension of the closing tape perpendicular to both the winding axis Y and the thickness direction of the core body after the closing tape 3 is flattened.

[0034] In this exemplary embodiment, Figure 1-3 As shown, the core body 11 includes two large surfaces 112 arranged opposite to each other, the large surface 112 is the largest side surface of the core body, and the closing tape 3 is attached to the large surface 112 of the core body 11. Accordingly, the extension dimension of the closing tape 3 in the direction perpendicular to the winding axis Y of the core body 11 is the dimension of the closing tape 3 in the length direction X of the core body.

[0035] like Figure 1-3 As shown, the winding core body 11 further includes an arc-shaped curved surface 113 connected between the two large surfaces 112 .

[0036] It should be understood that in other exemplary embodiments, the closing tape 3 may also be bonded to other positions of the core body 11. For example, the closing tape 3 may at least partially be attached to the arc surface 113. In addition, in other exemplary embodiments, the core body 11 may also be in other shapes, for example, the core body 11 may also be in a cylindrical shape.

[0037] In this exemplary embodiment, Figure 1-3 As shown, the end tape 3 includes a first side edge 31 and a second side edge 32, and the first side edge 31 and the second side edge 32 are arranged opposite to each other in the extension direction of the end tape 3 perpendicular to the winding axis Y of the winding core body 11; the end diaphragm 231 includes a winding tail end 2311, and in the winding direction Z of the winding tail end 2311, the first side edge 31 is located on the side of the winding tail end 2311 away from the second side edge 32, and the extension dimension from the overlapping position of the end tape 3 and the winding tail end 2311 to the first side edge 31 is e; e / c is 30%-50%. For example, e / c can be equal to 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, etc. If e / c is too small, e is too small, and the fixing effect of the closing tape 3 on the closing diaphragm 231 is weak; if e / c is too large, e is too large, and the bonding size between the closing tape 3 and the outer surface of the core body 11 is too large, which is not conducive to the disassembly of the core. In this exemplary embodiment, e / c is set to a suitable size, which can ensure the fixing effect of the closing tape on the closing diaphragm, and at the same time facilitate the disassembly of the core and save the closing tape.

[0038] In this exemplary embodiment, Figure 1-3 As shown, since the tail tape is attached to the large surface 112 of the core body 11 , the winding direction Z of the winding tail end 2311 is parallel to the length direction X of the core body.

[0039] In this exemplary embodiment, Figure 1-3As shown, the winding tail end 2311 of the tailing diaphragm 231 can be parallel to the winding axis Y of the winding core body 11. This arrangement can facilitate the fixing of the winding tail end 2311.

[0040] In this exemplary embodiment, Figure 1-3 As shown, the closing tape 3 may be rectangular, and the left and right sides of the closing tape 3 may be parallel to the winding axis Y of the winding core body 11. The closing tape 3 may better fix the winding tail end 2311 at various positions thereof.

[0041] In this exemplary embodiment, Figure 1-3 As shown, the dimension of the core body 11 in the length direction X is d, and d is greater than or equal to 100 mm. For example, d can be equal to 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, etc. a / b can be 15%-20%. For example, a / b can be equal to 15%, 16%, 17%, 18%, 19%, 20%, etc. The longer the length of the core body 11, the more difficult it is to tear the tape, and the greater the lower limit of the operating length a left for the jaws to disassemble the battery cell. At the same time, in order to ensure a greater fixing strength of the tail diaphragm, the upper limit of a / b is smaller.

[0042] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0043] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0044] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a quadrangular prism battery. The quadrangular prism battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0045] In other exemplary embodiments, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0046] The battery may be a wound battery, that is, a first pole piece, a second pole piece having electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding core.

[0047] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0048] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0049] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0050] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0051] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0052] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0053] It should be understood that the present disclosure is not limited to the exact 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 disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: A winding core (1), the winding core (1) comprising a winding core body (11), the winding core body (11) comprising a positive electrode sheet (21), a negative electrode sheet (22), and a separator (23), the separator (23) comprising a tail separator (231), the tail separator (231) being wound around the outside of the positive electrode sheet (21) and the negative electrode sheet (22); A tail tape (3) is bonded to the tail diaphragm (231) and is used to fix the tail diaphragm (231) on the outer surface of the winding core body (11); The core body (11) includes two first side surfaces (111) opposite to each other in the winding axis (Y) thereof, the distance between the closing tape (3) and the first side surface (111) in the winding axis (Y) of the core body (11) is a, the height of the core body (11) in the winding axis (Y) is b, and a / b is 10%-25%.

2. The battery according to claim 1, characterized in that The bonding strength between the tail diaphragm (231) and its inner diaphragm is 0.05N / cm to 0.1N / cm.

3. The battery according to claim 1, characterized in that The roughness of the surface of the diaphragm (23) is 0.2 μm-5 μm.

4. The battery according to claim 1, characterized in that The core body (11) includes a length direction (X) perpendicular to its winding axis (Y), the dimension of the core body (11) in the length direction (X) is d, the extension dimension of the tail tape (3) in the direction perpendicular to the winding axis (Y) of the core body (11) is c, and c / d is 15%-20%.

5. The battery according to claim 1, characterized in that The end tape (3) comprises a first side edge (31) and a second side edge (32), wherein the first side edge (31) and the second side edge (32) are arranged relative to each other in an extension direction of the end tape (3) perpendicular to the winding axial direction (Y) of the winding core body (11); The tail diaphragm (231) comprises a winding tail end (2311), in the winding direction (Z) of the winding tail end (2311), the first side edge (31) is located on a side of the winding tail end (2311) away from the second side edge (32), and the extension dimension from the overlapping position of the tail tape (3) and the winding tail end (2311) to the first side edge (31) is e; The extension dimension of the finishing tape (3) in the winding axial direction (Y) perpendicular to the winding core body (11) is c, and e / c is 30%-50%.

6. The battery according to any one of claims 1 to 5, characterized in that: The core body (11) comprises two large surfaces (112) arranged opposite to each other, wherein the large surface (112) is the largest side surface of the core body, and the finishing tape (3) is attached to the large surface (112) of the core body (11).

7. The battery according to any one of claims 1 to 5, characterized in that: The end tape (3) is rectangular, and two side edges of the end tape (3) are parallel to the winding axis (Y) of the winding core body (11).

8. The battery according to any one of claims 1 to 5, characterized in that: The winding tail end (2311) of the tail diaphragm (231) is parallel to the winding axis (Y) of the winding core body (11).

9. The battery according to any one of claims 1 to 5, characterized in that: The dimension of the winding core body (11) in the length direction (X) is d, d is greater than or equal to 100 mm, and a / b is 15%-20%.

10. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1 to 9.

Images