Curved battery cell with shaped structure and curved lithium battery

Abstract

The present application provides an arc-shaped battery cell and an arc-shaped lithium battery with a shaped structure. The arc-shaped battery cell with a shaped structure comprises a first shaped member and a second shaped member, both of which are wound and arranged on the surface of the arc-shaped battery cell, the extension direction of the first shaped member is parallel to the curvature direction of the arc-shaped battery cell, the extension direction of the second shaped member is at a preset angle to the curvature direction of the arc-shaped battery cell, the first shaped member and the second shaped member intersect and form an intersection node, and the first shaped member and the second shaped member are connected at the intersection node. The arc-shaped battery cell with a shaped structure has a good shaping effect, high stability and strong shaping durability.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to an arc-shaped battery cell and an arc-shaped lithium battery with a shaped structure. Background Art

[0002] Since the large-scale production of lithium-ion batteries in the 1990s, they have rapidly occupied many battery fields with their incomparable advantages at this stage, such as small size, large capacity, non-toxic and environmentally friendly, and long service life. They are especially used in portable electronic products. With the updating and development of science and technology, the market has higher and higher requirements for portable electronic products, and the requirements for their power sources have also increased accordingly. For example, the effective space left for batteries in irregular shapes, curves, and arc-shaped mobile phones has become irregular. With the further development of electronic products, smart watches and smart bracelets have been launched one after another. Since they are worn on the wrist when in use, the batteries they are equipped with need to be set according to the use status of the product, so corresponding arc batteries need to be provided.

[0003] However, the existing arc-shaped lithium battery cells are prone to rebound after being shaped, causing deformation of the arc-shaped lithium battery, thereby affecting the use of the arc-shaped lithium battery in products. Moreover, as time goes by, the bending part of the arc-shaped lithium battery will gradually weaken due to stress and other reasons, causing the curvature of the arc-shaped lithium battery to change, affecting the use of the arc-shaped lithium battery. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a curved battery cell and a curved lithium battery with good shaping effect, high stability and strong shaping durability.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A curved battery cell with a shaped structure, the shaped structure comprising a first shaped piece and a second shaped piece, the first shaped piece and the second shaped piece are both wound around the surface of the curved battery cell, the extension direction of the first shaped piece is parallel to the curvature direction of the curved battery cell, the extension direction of the second shaped piece is at a preset angle to the curvature direction of the curved battery cell, the first shaped piece intersects with the second shaped piece and forms an intersection node, and the first shaped piece and the second shaped piece are connected at the intersection node.

[0007] In one embodiment, the first shaped member and the second shaped member are connected by a locking mechanism.

[0008] In one embodiment, there are multiple first shaped members, and each of the first shaped members is connected to the second shaped member.

[0009] In one embodiment, the distance between two adjacent first shaping members gradually increases from the middle of the bent portion of the arc-shaped battery core to both sides of the arc-shaped battery core.

[0010] In one embodiment, there are multiple second shaped members, and each of the second shaped members is connected to the first shaped member.

[0011] In one embodiment, the distance between adjacent second shaped members gradually increases from the bent portion of the arc-shaped battery core to both ends of the arc-shaped battery core.

[0012] In one embodiment, the arc-shaped battery core is provided with a first groove, and the first shaping member is embedded in the first groove.

[0013] In one embodiment, the arc-shaped battery core is provided with a second groove, and the second shaping member is embedded in the second groove.

[0014] In one embodiment, the first shaped member and the second shaped member are arranged perpendicularly.

[0015] A curved lithium battery comprises a curved battery cell with a shaped structure as described in any of the above embodiments.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. In the arc-shaped battery cell with a shaping structure of the present invention, the shaping structure includes a first shaping member and a second shaping member. The first shaping member is wound and arranged on the surface of the arc-shaped battery cell, and the extension direction of the first shaping member is parallel to the curvature direction of the arc-shaped battery cell. The first shaping member can shape and fix the arc-shaped battery cell along the curvature direction of the arc-shaped battery cell, and the shaping effect is better. At the same time, the first shaping member can block the stress generated by the arc-shaped battery cell that is opposite to the curvature direction, thereby effectively preventing the arc-shaped battery cell from rebounding after shaping, and improving the stability of the arc-shaped battery cell.

[0018] 2. In the arc-shaped battery cell with a shaping structure of the present invention, the second shaping member is wound and arranged on the surface of the arc-shaped battery cell, and the extension direction of the second shaping member forms a preset angle with the arc direction of the arc-shaped battery cell. The second shaping member can shape and fix the arc-shaped battery cell along the direction that forms a preset angle with the arc direction of the arc-shaped battery cell, thereby improving the stability of the shape of the arc-shaped battery cell. Furthermore, the second shaping member cooperates with the first shaping member to shape and fix the arc-shaped battery cell simultaneously from the arc direction of the arc-shaped battery cell and the direction that forms a preset angle with the arc direction, and the arc-shaped battery cell is shaped and fixed from two different directions, thereby effectively improving the shaping effect of the arc-shaped battery cell.

[0019] 3. In the arc-shaped battery cell with a shaping structure of the present invention, the first shaping member and the second shaping member intersect and form an intersection node, and the first shaping member and the second shaping member are connected at the intersection node, so as to prevent the first shaping member from sliding, and prevent the second shaping member from sliding, thereby improving the stability of the shaping structure, thereby improving the stability of the shape of the arc-shaped battery cell, and further improving the shaping effect of the arc-shaped battery cell. In addition, the first shaping member and the second shaping member are both wound around the surface of the arc-shaped battery cell, which can effectively enhance the shaping durability of the arc-shaped battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic structural diagram of an arc-shaped battery cell with a shaped structure in one embodiment;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure at the intersection node in the shaped structure shown. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] The present application provides an arc-shaped battery cell with a shaped structure. The arc-shaped battery cell with a shaped structure comprises a first shaped member and a second shaped member, the first shaped member and the second shaped member are both wound and arranged on the surface of the arc-shaped battery cell, the extension direction of the first shaped member is parallel to the arc direction of the arc-shaped battery cell, the extension direction of the second shaped member is at a preset angle to the arc direction of the arc-shaped battery cell, the first shaped member and the second shaped member intersect and form an intersection node, and the first shaped member and the second shaped member are connected at the intersection node.

[0027] like Figure 1 and Figure 2 As shown, an arc-shaped battery cell 20 with a shaping structure 10 of one embodiment includes a first shaping piece 100 and a second shaping piece 200. The first shaping piece 100 and the second shaping piece 200 are both wound around the surface of the arc-shaped battery cell 20. The first shaping piece 100 is parallel to the curvature direction of the arc-shaped battery cell 20, and the second shaping piece 200 is perpendicular to the curvature direction of the arc-shaped battery cell 20. The first shaping piece 100 and the second shaping piece 200 intersect and form an intersection node 300. The first shaping piece 100 and the second shaping piece 200 are connected at the intersection node 300.

[0028] In the above-mentioned arc-shaped battery cell 20 with the shaping structure 10, the shaping structure 10 includes a first shaping member 100 and a second shaping member 200. The first shaping member 100 is wound and arranged on the surface of the arc-shaped battery cell 20, and the extension direction of the first shaping member 100 is parallel to the curvature direction of the arc-shaped battery cell 20. The first shaping member 100 can shape and fix the arc-shaped battery cell 20 along the curvature direction of the arc-shaped battery cell 20, and the shaping effect is better. At the same time, the first shaping member 100 can block the stress generated by the arc-shaped battery cell 20 in the opposite direction of the curvature direction, thereby effectively preventing the arc-shaped battery cell 20 from rebounding after shaping, and improving the stability of the arc-shaped battery cell 20. The second shaping member 200 is wound and arranged on the surface of the arc-shaped battery cell 20, and the extension direction of the second shaping member 200 forms a preset angle with the arc direction of the arc-shaped battery cell 20. The second shaping member 200 can shape and fix the arc-shaped battery cell 20 along the direction that forms a preset angle with the arc direction of the arc-shaped battery cell 20, thereby improving the stability of the shape of the arc-shaped battery cell 20. Further, the second shaping member 200 cooperates with the first shaping member 100 to shape and fix the arc-shaped battery cell 20 simultaneously from the arc direction of the arc-shaped battery cell 20 and the direction that forms a preset angle with the arc direction, and the arc-shaped battery cell 20 is shaped and fixed from two different directions, thereby effectively improving the shaping effect of the arc-shaped battery cell 20. Furthermore, the first shaping member 100 and the second shaping member 200 intersect and form an intersection node 300, and the first shaping member 100 and the second shaping member 200 are connected at the intersection node 300, so as to prevent the first shaping member 100 and the second shaping member 200 from sliding, thereby improving the stability of the shaping structure 10, thereby improving the stability of the shape of the arc-shaped battery cell 20, and further improving the shaping effect of the arc-shaped battery cell 20. In addition, the first shaping member 100 and the second shaping member 200 are both wound around the surface of the arc-shaped battery cell 20, which can effectively enhance the shaping durability of the arc-shaped battery cell 20.

[0029] In one embodiment, the preset angle between the extension direction of the first shaping member 100 and the extension direction of the first shaping member 200 is 90 degrees. In this embodiment, the extension direction of the first shaping member 100 is parallel to the curvature direction of the arc-shaped battery cell, and the extension direction of the first shaping member 100 is perpendicular to the curvature direction of the arc-shaped battery cell. In this embodiment, the curvature direction of the arc-shaped battery cell is the X-axis direction, and the direction perpendicular to the curvature direction of the arc-shaped battery cell is the Y-axis direction. The first shaping member 200 cooperates with the first shaping member 100 to shape and fix the arc-shaped battery cell simultaneously from the curvature direction of the arc-shaped battery cell and the direction perpendicular to the curvature direction, which is equivalent to shaping and fixing the arc-shaped battery cell from the X-axis direction and the Y-axis direction at the same time, so that the shaping force of the shaping structure on the arc-shaped battery cell is the maximum, and the shaping effect of the shaping structure on the arc-shaped battery cell is further improved.

[0030] In one embodiment, the first shaped member 100 and the second shaped member 200 are connected by a lock. It is understandable that the first shaped member 100 and the second shaped member 200 intersect and form an intersection node 300, and the first shaped member 100 and the second shaped member 200 are connected at the intersection node 300, so as to prevent the first shaped member 100 from sliding in the vertical direction of the arc direction, and prevent the second shaped member 200 from sliding in the arc direction, thereby improving the stability of the shaped structure 10, thereby improving the stability of the shape of the arc-shaped battery cell 20, and further improving the shaping effect of the arc-shaped battery cell 20. However, the connection between the first shaped member 100 and the second shaped member 200 is prone to excessive force and fall off, and if a reinforcement member is added at the connection, it is easy to affect the flatness of the shaped structure 10 on the surface of the arc-shaped battery cell 20, and the operation is more complicated and the stability is lower. In order to further improve the flatness and stability of the connection between the first shaped member 100 and the second shaped member 200, in this embodiment, the first shaped member 100 and the second shaped member 200 are connected by a lock. Specifically, Figure 2 As shown, the first shaped member 100 is wound at the connection to form a first ring 400, and the second shaped member 200 is wound at the connection to form a second ring 500, and the second ring 500 is inserted into the first ring 400 to form a locking connection, so that the connection between the first shaped member 100 and the second shaped member 200 is more firm and stable, thereby more effectively preventing the first shaped member 100 and the second shaped member 200 from sliding, and ensuring the stability of the shaped structure 10. In addition, the locking connection between the first shaped member 100 and the second shaped member 200 does not require the addition of a reinforcement member. The first ring 400 formed by the first shaped member itself and the second ring 500 formed by the second shaped member 200 itself and connected to each other can effectively improve the flatness of the connection between the first shaped member 100 and the second shaped member 200, which is conducive to improving the flatness of the subsequent packaging of the arc-shaped battery cell 20. Moreover, the greater the force exerted on the first shaping member 100 and the second shaping member 200 , the tighter the connection between the first ring 400 and the second ring 500 , thereby effectively ensuring the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20 .

[0031] In order to further improve the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20, in one embodiment, the number of the first shaping member 100 is multiple, and each first shaping member is connected to the second shaping member. It can be understood that the first shaping member 100 is wound around the surface of the arc-shaped battery cell 20, and the first shaping is parallel to the curvature direction of the arc-shaped battery cell 20. The first shaping member 100 can shape and fix the arc-shaped battery cell 20 along the curvature direction of the arc-shaped battery cell 20, and the shaping effect is better. In order to ensure the air permeability of the arc-shaped battery cell 20, the first shaping member 100 cannot be completely covered on the arc-shaped battery cell 20, so that the first shaping member 100 can only shape the arc-shaped battery cell 20 from a part, so that the shaping effect is weak. In order to further improve the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20, in the present embodiment, there are multiple first shaping members 100, each of which is connected to the second shaping member, and the multiple first shaping members 100 are respectively wound and arranged on the arc-shaped surface, and the spacing between the multiple first shaping members 100 is greater than 0, so that the arc-shaped battery cell 20 can be shaped from different parts of the arc direction respectively, thereby further improving the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20.

[0032] Furthermore, the spacing between two adjacent first shaping members 100 gradually increases from the middle of the bending portion of the arc-shaped battery cell 20 to the two sides of the arc-shaped battery cell 20. It is understandable that after the arc-shaped battery cell 20 is bent and formed, stress opposite to the bending direction will be generated, which makes it easy for the arc-shaped battery cell 20 to rebound after forming. Moreover, in the arc-shaped battery cell 20, the greater the stress of the part closer to the bending portion, the easier it is to rebound, that is, shaping is more difficult. The first shaping member 100 is wound around the surface of the arc-shaped battery cell 20, and the first shaping member 100 is parallel to the curvature direction of the arc-shaped battery cell 20, that is, the first shaping member 100 can shape and fix the arc-shaped battery cell 20 along the curvature direction of the arc-shaped battery cell 20. In order to further improve the shaping effect of the first shaping member 100 on the arc-shaped battery cell 20, in the present embodiment, the distance between two adjacent first shaping members 100 gradually increases from the middle of the bending portion of the arc-shaped battery cell 20 to the two sides of the arc-shaped battery cell 20, so that the shaping force of the first shaping member 100 on the middle of the bending portion of the arc-shaped battery cell 20 is the largest, and gradually weakens from the middle of the bending portion to the two sides of the arc-shaped battery cell 20, which corresponds to the strength of the stress at the bending portion and both sides of the arc-shaped battery cell 20, so that the first shaping member 100 can shape different parts of the arc-shaped battery cell 20 more accurately, further improve the shaping effect of the first shaping member 100 on the arc-shaped battery cell 20, and make the arc structure of the arc-shaped battery cell 20 more stable.

[0033] In one embodiment, the number of the second shaping members 200 is multiple, and each of the second shaping members is connected to the first shaping member. It is understandable that the second shaping member 200 is wound around the surface of the arc-shaped battery cell 20, and the second shaping member 200 is perpendicular to the curvature direction of the arc-shaped battery cell 20. The second shaping member 200 can shape and fix the arc-shaped battery cell 20 along the direction perpendicular to the curvature direction of the arc-shaped battery cell 20, thereby improving the stability of the shape of the arc-shaped battery cell 20. In order to ensure the air permeability of the arc-shaped battery cell 20, the second shaping member 200 cannot be completely covered on the arc-shaped battery cell 20, so that the second shaping member 200 can only partially shape the arc-shaped battery cell 20 along the direction perpendicular to the curvature direction of the arc-shaped battery cell 20, so that the shaping effect is weak. In order to further improve the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20, in this embodiment, the number of the second shaping members 200 is multiple, each of the second shaping members is connected to the first shaping member, and the multiple second shaping members 200 are respectively wound and arranged on the arc surface, and the spacing between the multiple first shaping members 100 is greater than 0, so that the arc-shaped battery cell 20 can be shaped from different parts perpendicular to the arc direction, and the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20 is further improved. In addition, the multiple second shaping members 200 can be respectively intersected and connected with the multiple first shaping members 100, so as to form a mesh-shaped shaping structure 10, so as to have a shaping effect on the arc-shaped battery cell 20 in all directions, further improving the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20, and then improving the structural stability of the arc-shaped battery cell 20.

[0034] Furthermore, the spacing between two adjacent second shaping members 200 gradually increases from the bending portion of the arc-shaped battery cell 20 to the two ends of the arc-shaped battery cell 20. It is understandable that after the arc-shaped battery cell 20 is bent and formed, stress opposite to the bending direction will be generated, which makes it easy for the arc-shaped battery cell 20 to rebound after forming. Moreover, in the arc-shaped battery cell 20, the greater the stress of the part closer to the bending portion, the easier it is to rebound, that is, shaping is more difficult. The second shaping member 200 is wound around the surface of the arc-shaped battery cell 20, and the first shaping member 100 is perpendicular to the curvature direction of the arc-shaped battery cell 20, that is, the first shaping member 100 can shape and fix the arc-shaped battery cell 20 along the direction perpendicular to the curvature direction of the arc-shaped battery cell 20. In order to further improve the shaping effect of the second shaping member 200 on the arc-shaped battery cell 20, in the present embodiment, the spacing between two adjacent second shaping members 200 gradually increases from the bending portion of the arc-shaped battery cell 20 to the two ends of the arc-shaped battery cell 20, so that the shaping force of the second shaping member 200 on the bending portion of the arc-shaped battery cell 20 is the largest, and gradually weakens from the bending portion to the two ends of the arc-shaped battery cell 20, which corresponds to the strength of the stress at the bending portion and the two ends of the arc-shaped battery cell 20, so that the second shaping member 200 can shape different parts of the arc-shaped battery cell 20 more accurately, further improve the shaping effect of the second shaping member 200 on the arc-shaped battery cell 20, and make the arc structure of the arc-shaped battery cell 20 more stable. In addition, the second shaping member 200 can enhance the shaping force of the first shaping member 100 on the bending direction of the arc-shaped battery cell 20, and play a good auxiliary role in the first shaping member 100. At the same time, multiple second shaping members 200 can be respectively intersected and connected with multiple first shaping members 100 to form a mesh shaping structure 10. The mesh shaping structure 10 can generate a shaping force that is closer to the stress of the arc-shaped battery cell 20, so that the structure of the arc-shaped battery cell 20 can be maintained in a stable state, thereby improving the structural stability of the arc-shaped battery cell 20.

[0035] In one embodiment, the arc-shaped battery cell 20 is provided with a first groove, and the first shaping member 100 is embedded in the first groove. It can be understood that the first shaping member 100 is wound around the surface of the arc-shaped battery cell 20 to shape the arc-shaped battery cell 20. Since the surface of the arc-shaped battery cell 20 is relatively flat and smooth, when the arc-shaped battery cell 20 is deformed and rebounded due to stress, the first shaping member 100 is easy to move relative to the surface of the arc-shaped battery cell 20, thereby affecting the shaping effect of the first shaping member 100 on the arc-shaped battery cell 20. In order to improve the winding stability of the first shaping piece 100 on the surface of the arc-shaped battery cell 20, in the present embodiment, the arc-shaped battery cell 20 is provided with a first groove, and the first shaping piece 100 is embedded in the first groove. The first groove can fix the first shaping piece 100 to prevent the first shaping piece 100 from moving relative to the surface of the arc-shaped battery cell 20, thereby improving the winding stability of the first shaping piece 100 on the surface of the arc-shaped battery cell 20, and further improving the shaping effect of the first shaping piece 100 on the arc-shaped battery cell 20.

[0036] In one embodiment, the arc-shaped battery cell 20 is provided with a second groove, and the second shaping member 200 is embedded in the second groove. It can be understood that the second shaping member 200 is wound around the surface of the arc-shaped battery cell 20 to shape the arc-shaped battery cell 20. Since the surface of the arc-shaped battery cell 20 is relatively flat and smooth, when the arc-shaped battery cell 20 is deformed and rebounded due to stress, the second shaping member 200 is easy to move relative to the surface of the arc-shaped battery cell 20, thereby affecting the shaping effect of the second shaping member 200 on the arc-shaped battery cell 20. In order to improve the winding stability of the second shaping piece 200 on the surface of the arc-shaped battery cell 20, in the present embodiment, the arc-shaped battery cell 20 is provided with a second groove, and the second shaping piece 200 is embedded in the second groove. The second groove can fix the second shaping piece 200 to prevent the second shaping piece 200 from moving relative to the surface of the arc-shaped battery cell 20, thereby improving the winding stability of the second shaping piece 200 on the surface of the arc-shaped battery cell 20, and further improving the shaping effect of the second shaping piece 200 on the arc-shaped battery cell 20.

[0037] In one embodiment, the first shaping member 100 is vertically arranged with the second shaping member 200. It can be understood that the first shaping member 100 intersects with the second shaping member 200 and forms an intersection node 300, and the first shaping member 100 and the second shaping member 200 are connected at the intersection node 300, so as to prevent the first shaping member 100 from sliding in the vertical direction of the arc direction, and prevent the second shaping member 200 from sliding in the arc direction, and at the same time, the second shaping member 200 can enhance the shaping force of the first shaping member 100 on the bending direction of the arc-shaped battery cell 20, and play a good auxiliary role for the first shaping member 100. In order to further enhance the collaborative shaping effect of the first shaping member 100 and the second shaping member 200, in the present embodiment, the first shaping member 100 and the second shaping member 200 are vertically arranged, so that the force point of the second shaping member 200 on the first shaping member 100 is the largest, so that the second shaping member 200 can maximize the shaping force of the first shaping member 100 on the bending direction of the arc-shaped battery cell 20, further enhance the collaborative shaping effect of the first shaping member 100 and the second shaping member 200, and further enhance the shaping effect of the shaping structure 10 on the arc-shaped battery cell 20.

[0038] The present application also provides a curved lithium battery, which includes a curved battery cell 20 having a shaped structure 10 as described in any of the above embodiments.

[0039] In one embodiment, the shaping process of the curved lithium battery includes some or all of the following steps:

[0040] S100, performing arc-shaped stamping operation on the lithium battery cell to obtain an arc-shaped lithium battery cell.

[0041] In this embodiment, the manufactured lithium battery cell is subjected to arc-shaped stamping operation to make the lithium battery cell reach a preset arc, thereby obtaining the desired arc-shaped lithium battery cell.

[0042] S200 uses a fixing plate to fix the arc-shaped lithium battery cell.

[0043] In this embodiment, before the shaping piece is woven on the surface of the arc-shaped lithium battery cell along the curvature of the arc-shaped lithium battery, a fixing sheet is used to fix the arc-shaped lithium battery cell so that the arc-shaped lithium battery maintains its original arc state during the weaving process of the shaping piece, thereby making the woven mesh shaping piece more consistent with the curvature of the arc-shaped lithium battery cell, further improving the shaping effect of the arc-shaped lithium battery.

[0044] S300, performing a shaping piece weaving operation on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery cell to form a mesh-shaped shaping piece.

[0045] In this embodiment, a mesh-shaped shaping member is formed by weaving a shaping member on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery, so that the arc-shaped lithium battery can obtain a good shaping effect in both the X-axis direction and the Y-axis direction, and the mesh-shaped shaping member is attached to the surface of the arc-shaped lithium battery cell, which can further improve the shaping effect of the arc-shaped lithium battery cell. In addition, the mesh-shaped shaping member is woven on the surface of the arc-shaped lithium battery cell, which can not only play a shaping role before packaging, but also play a shaping role after packaging and in the subsequent use of the arc-shaped lithium battery, so that the arc-shaped lithium battery is not easy to rebound after being shaped.

[0046] S400, extracting the fixing sheet and sealing the mesh-shaped shaping member to obtain the arc-shaped lithium battery cell to be packaged.

[0047] It can be understood that the fixing piece is used to fix the arc-shaped lithium battery cell, so that the arc-shaped lithium battery maintains its original arc state during the weaving process of the shaping piece, so that the woven mesh shaping piece is more in line with the curvature of the arc-shaped lithium battery cell, further improving the shaping effect of the arc-shaped lithium battery. However, if the fixing piece is left in the cell of the arc-shaped lithium battery, it will affect the capacity of the arc-shaped lithium battery. In order to improve the shaping effect of the arc-shaped lithium battery while ensuring the capacity of the arc-shaped lithium battery, in this embodiment, after the shaping piece weaving operation is completed, the fixing piece is pulled out from the surface of the arc-shaped lithium battery cell. In this embodiment, after the shaping piece completes the mesh weaving operation on the surface of the arc-shaped lithium battery cell, the shaping piece is wrapped in a mesh on the surface of the arc-shaped lithium battery cell, and an opening is left on one side of the arc-shaped lithium battery cell for pulling the fixing piece out from the surface of the arc-shaped lithium battery cell, thereby avoiding the influence of the fixing piece on the capacity of the arc-shaped lithium battery and improving the capacity of the arc-shaped lithium battery. Furthermore, after the fixing sheet is pulled out from the opening of the mesh shaping member, the mesh shaping member is sealed to prevent the arc-shaped lithium battery cell from sliding along the opening direction of the mesh shaping member, so that the mesh shaping member can shape the arc-shaped lithium battery cell more stably.

[0048] S500, performing packaging operation on the arc-shaped lithium battery cell to be packaged to obtain an arc-shaped lithium battery.

[0049] In this embodiment, after the mesh shaping member is woven and coated on the surface of the arc-shaped lithium battery cell, the arc-shaped lithium battery to be packaged is placed in an aluminum-plastic sleeve and packaged to obtain the arc-shaped lithium battery.

[0050] In one embodiment, after the step of weaving the shaping piece on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery cell to form a mesh-shaped shaping piece, and before the step of extracting the fixing sheet and sealing the mesh-shaped shaping piece to obtain the arc-shaped lithium battery cell to be packaged, the shaping process of the arc-shaped lithium battery also includes the following steps: coating the nodes of the mesh-shaped shaping piece with glue. It can be understood that the mesh-shaped shaping piece includes a plurality of first shaping pieces and a plurality of second shaping pieces, and the plurality of first shaping pieces are interwoven with the plurality of second shaping pieces respectively to form a mesh-shaped shaping piece. The intersection of the first shaping piece and the second shaping piece in the mesh-shaped shaping piece is the node. The node of the mesh-shaped shaping piece is crucial to the structural stability of the mesh-shaped shaping piece. If the node of the mesh-shaped shaping piece is loose, it is easy to deform the structure of the mesh-shaped shaping piece, thereby affecting the shaping effect of the mesh-shaped shaping piece. In order to improve the stability of the mesh forming part, in the present embodiment, after the step of weaving the forming part on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery cell to form the mesh forming part, before the step of pulling out the fixing sheet and sealing the mesh forming part to obtain the arc-shaped lithium battery cell to be packaged, the following steps are also included: coating the nodes of the mesh forming part with glue. On the one hand, the glue can enhance the bonding strength at the intersection of the first forming part and the second forming part, that is, enhance the structural strength of the nodes of the mesh forming part, thereby improving the structural strength of the mesh forming part; on the other hand, the glue can fix the nodes of the mesh forming part, thereby improving the structural stability of the mesh forming part.

[0051] Further, the colloid material in the coating operation is at least one of polypropylene, polyethylene and polyester. It is understandable that polypropylene is a polymer formed by polyaddition reaction of propylene, which has chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing performance. In this embodiment, the colloid material in the coating operation is at least one of polypropylene, polyethylene and polyester, which can effectively enhance the structural strength and structural stability of the nodes of the mesh shaping member. Secondly, polypropylene, polyethylene and homogeneous materials all have strong electrolyte resistance and electrical insulation, making the mesh shaping member more stable in the use environment of the arc lithium battery. In addition, polypropylene and polyethylene also have good wear resistance and impact resistance, so that the wear resistance and impact resistance of each node in the mesh shaping member can be effectively improved, thereby improving the shaping effect of the arc lithium battery. In another embodiment, the colloid material in the coating operation is a rubber glue comprising polyisobutylene rubber, epoxidized polyisobutylene rubber, amino-terminated liquid nitrile rubber, terpene resin, pigment and organic solvent. The rubber glue uses polyisobutylene rubber with excellent chemical resistance as the main body, and epoxidized polyisobutylene rubber and amino-terminated liquid nitrile rubber are added. Through the cross-linking reaction of epoxidized polyisobutylene rubber and amino-terminated liquid nitrile rubber, the bonding performance of the rubber glue can be effectively improved, and the electrolyte resistance of the rubber glue can be improved.

[0052] In one embodiment, after the step of coating the nodes of the mesh forming member with glue, and before the step of extracting the fixing sheet and sealing the mesh forming member to obtain the arc-shaped lithium battery cell to be packaged, the shaping process of the arc-shaped lithium battery also includes the following steps: low-temperature baking of the arc-shaped lithium battery cell. It is understandable that after the nodes of the mesh forming member have just completed the coating operation, water solvent is likely to remain at the coating, which is not conducive to the fixation and shaping of the nodes, and is likely to affect the shaping effect of the mesh forming member. Secondly, if the coating is cured after the mesh forming member completes the sealing operation, the mesh forming member cannot be sealed at the opening according to the changes of each forming member in the mesh forming member after the curing operation, thereby affecting the fit of the mesh forming member and the arc-shaped lithium battery cell, and further affecting the shaping effect of the mesh forming member. In order to improve the fit between the mesh shaped member and the arc-shaped lithium battery cell and the curing effect of the node, in this embodiment, after the step of coating the nodes of the mesh shaped member with glue, before the step of extracting the fixing sheet and sealing the mesh shaped member to obtain the arc-shaped lithium battery cell to be packaged, the following steps are also included: low-temperature baking of the arc-shaped lithium battery cell can effectively volatilize the water solvent remaining in the coating, so that the curing effect of the node is better and not easy to deform. In addition, after low-temperature baking, each node in the mesh shaped member can make the node fit with the arc-shaped lithium battery cell, thereby driving the fit effect of the entire mesh shaped member and the arc-shaped lithium battery cell, and then improving the shaping effect of the mesh shaped member.

[0053] Furthermore, the temperature of low-temperature baking is 100°C to 120°C. It is understandable that if the temperature of low-temperature baking is too low, the volatilization efficiency of the residual aqueous solution at the coating is low, and the colloid cannot be melted, thereby failing to enhance the bonding effect between the node and the surface of the arc-shaped lithium battery cell; if the temperature of low-temperature baking is too high, it is easy to cause burns to the shaped parts and the diaphragm. In this embodiment, the temperature of low-temperature baking is 110°C, which can effectively volatilize the residual aqueous solution at the coating, improve the bonding performance at the coating, and melt the colloid, thereby enhancing the bonding effect between the node and the surface of the arc-shaped lithium battery cell.

[0054] In one embodiment, the shaping member is glass fiber. It is understandable that glass fiber is an inorganic non-metallic material with excellent performance. Glass fiber has good insulation, heat resistance and resistance to electrolyte corrosion, and has high tensile strength. In this embodiment, the use of glass fiber as the shaping member can effectively improve the shaping effect of the mesh shaping member on the arc-shaped lithium battery cell, and at the same time can effectively prevent the electrolyte from corroding the mesh shaping member, and keep the mesh shaping member in good insulation to avoid affecting the performance of the arc-shaped lithium battery. In this embodiment, the shaping member is rope-shaped or strip-shaped.

[0055] Further, the glass fiber is impregnated with the hot melt adhesive to obtain a modified glass fiber, so that the modified glass fiber has good flexibility and wear resistance. It is understandable that the glass fiber has good insulation, heat resistance and resistance to electrolyte corrosion, and has high tensile strength. However, the glass fiber is brittle and has poor wear resistance. During the shaping process, the structural strength of the mesh shaping piece is poor. In order to further improve the structural strength of the mesh shaping piece, in this embodiment, the glass fiber is impregnated with the hot melt adhesive so that the hot melt adhesive is integrated into the structure of the glass fiber, thereby improving the flexibility and wear resistance of the glass fiber, and then improving the structural strength of the mesh shaping piece. In addition, the melting point of the hot melt adhesive is 100°C to 120°C. When the arc lithium battery is used normally, the hot melt adhesive can play a role in enhancing the structural strength of the mesh shaping piece. When the temperature is too high, the hot melt adhesive begins to melt and coats the surface of the arc lithium battery cell, thereby protecting the arc lithium battery cell, thereby improving the safety of the arc lithium battery.

[0056] In one of the embodiments, the arc stamping operation is a hot pressing operation. It is understandable that due to the use requirements of the product, the lithium battery needs to be bent to a certain curvature. During the bending and forming process, the arc lithium battery has the problem of difficulty in forming. If the pressure during the bending and forming process is too large, it is easy to cause the lithium battery cell to be deformed or broken. In order to improve the forming effect and curvature stability of the arc-shaped lithium battery cell, in this embodiment, an arc-shaped stamping die is used to perform hot pressing on the lithium battery cell, so that the pressure on the lithium battery cell during the bending and forming process is small, the curvature stability after forming is better, and the curvature of the lithium battery cell after forming is more precise, and the forming effect is better.

[0057] Furthermore, the temperature in the hot pressing operation is 100°C to 120°C, and the pressure is 0.4MPa to 0.8MPa. In this embodiment, the melting point of the diaphragm in the lithium battery cell is 160°C. The hot pressing temperature in this embodiment can bend the lithium battery cell smoothly to a preset curvature, and can effectively protect the diaphragm. Furthermore, at the above hot pressing temperature, the required molding pressure is small, so that the pressure on the lithium battery cell during the bending molding process is small, the curvature stability after molding is good, and the curvature of the lithium battery cell after molding is more precise, and the molding effect is good.

[0058] In one embodiment, the width of the fixing sheet is less than the width of the arc-shaped lithium battery cell. It is understandable that before the shaping piece is woven on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery, the fixing sheet is used to fix the arc-shaped lithium battery cell so that the arc-shaped lithium battery maintains its original arc state during the weaving process of the shaping piece, thereby making the woven mesh shaping piece more consistent with the curvature of the arc-shaped lithium battery cell, further improving the shaping effect of the arc-shaped lithium battery. After the mesh shaping piece completes the weaving operation on the surface of the arc-shaped lithium battery cell, the fixing sheet needs to be removed from the surface of the arc-shaped lithium battery cell, otherwise the fixing sheet will be left in the arc-shaped lithium battery cell, which will affect the capacity of the arc-shaped lithium battery. Furthermore, if the width of the fixing plate is too large, the mesh shaping member is easily suspended during the weaving process of the mesh shaping member. When the fixing plate is pulled out, a large gap is easily formed between the mesh shaping member and the arc-shaped lithium battery cell, so that the shaping effect of the mesh shaping member on the arc-shaped lithium battery cell is poor. In order to further improve the shaping effect of the mesh shaping member and ensure the capacity of the arc-shaped lithium battery at the same time, in this embodiment, the width of the fixing plate is less than the width of the arc-shaped lithium battery cell. First, the fixing plate can fix the arc-shaped lithium battery cell in the weaving process of the shaping member, so that the mesh shaping member is easier to weave on the surface of the arc-shaped lithium battery cell, and the mesh shaping member obtained by weaving is more stable. Secondly, it can prevent the fixing plate from suspending the mesh shaping member during the weaving process of the mesh shaping member, and after the fixing plate is pulled out, the mesh shaping member and the arc-shaped lithium battery cell can be more closely fitted, thereby further improving the shaping effect of the mesh shaping member on the arc-shaped lithium battery cell.

[0059] In one embodiment, the weaving operation includes transverse weaving and longitudinal weaving, and the direction of the transverse weaving is perpendicular to the direction of the longitudinal weaving. It can be understood that by performing a shaping piece weaving operation on the surface of the arc-shaped lithium battery cell along the curvature direction of the arc-shaped lithium battery, a mesh shaping piece is formed, so that the arc-shaped lithium battery can obtain a better shaping effect in both the X-axis direction and the Y-axis direction, and the mesh shaping piece is attached to the surface of the arc-shaped lithium battery cell, which can further improve the shaping effect of the arc-shaped lithium battery cell. The weaving method is an important factor in determining the structural stability of the mesh shaping piece. In order to improve the structural stability of the mesh shaping member, in the present embodiment, the weaving operation includes transverse weaving and longitudinal weaving. The direction of the transverse weaving is perpendicular to the direction of the longitudinal weaving. The transverse direction is the positive direction of the X-axis, and the longitudinal direction is the positive direction of the Y-axis. The mesh shaping member obtained by weaving in the above-mentioned weaving method can shape the arc-shaped lithium battery cell from the positive direction of the X-axis and the positive direction of the Y-axis respectively, thereby effectively increasing the shaping force of the mesh shaping member on the arc-shaped lithium battery cell, thereby improving the shaping effect of the mesh shaping member on the arc-shaped lithium battery cell.

[0060] Furthermore, the nodes of the mesh shaping member adopt a loop weaving method. Specifically, the transverse shaping member is wound in the transverse weaving direction of the node to form a first loop, and the longitudinal shaping member forms a second loop in the longitudinal weaving direction of the node, and the second loop is inserted into the first loop. In this way, by fixing the first loop and the second loop to each other, the sliding of the transverse shaping member and the longitudinal shaping member can be effectively prevented, thereby effectively improving the firmness and stability of the nodes of the mesh shaping member, and further improving the shaping effect of the mesh shaping member on the arc-shaped lithium battery cell.

[0061] In one of the embodiments, after the step of extracting the fixing sheet and sealing the mesh shaping piece to obtain the arc-shaped lithium battery cell to be packaged, and before the step of packaging the arc-shaped lithium battery cell to obtain the arc-shaped lithium battery, the shaping process of the arc-shaped lithium battery also includes the following steps: trimming the sealing part of the arc-shaped lithium battery cell to be packaged. It can be understood that in order to ensure that the woven mesh shaping piece can completely fix the entire arc-shaped lithium battery roll core, prevent the shaping piece from being insufficient in length during the weaving process, and facilitate the sealing operation at the sealing part, the shaping piece is often provided with a reserved part. However, after the mesh shaping piece is woven, the remaining reserved part of the shaping piece will affect the subsequent packaging process of the arc-shaped lithium battery, resulting in poor sealing of the packaging. In order to improve the sealing performance of the packaging of arc-shaped lithium batteries and ensure the shaping effect of the mesh shaping piece on the arc-shaped lithium battery cell, in the present embodiment, after the step of pulling out the fixing sheet and sealing the mesh shaping piece to obtain the arc-shaped lithium battery cell to be packaged, and before the step of packaging the arc-shaped lithium battery cell to obtain the arc-shaped lithium battery, the following steps are also included: trimming the sealing part of the arc-shaped lithium battery cell to be packaged, and using trimming equipment to cut off the reserved shaping piece remaining after the weaving of the mesh shaping piece is completed, so as to ensure the flatness of the surface of the mesh shaping piece, especially the sealing part. When the arc-shaped lithium battery is packaged, the sealing performance of the packaging of the arc-shaped lithium battery can be effectively improved, and the shaping effect of the mesh shaping piece on the arc-shaped lithium battery cell can be ensured.

[0062] Compared with the prior art, the present invention has at least the following advantages:

[0063] 1. In the arc-shaped battery cell 20 with the shaping structure 10 of the present invention, the shaping structure 10 includes a first shaping member 100 and a second shaping member 200. The first shaping member 100 is wound and arranged on the surface of the arc-shaped battery cell 20, and the first shaping member is parallel to the curvature direction of the arc-shaped battery cell 20. The first shaping member 100 can shape and fix the arc-shaped battery cell 20 along the curvature direction of the arc-shaped battery cell 20, and the shaping effect is better. At the same time, the first shaping member 100 can block the stress generated by the arc-shaped battery cell 20 in the opposite direction of the curvature direction, thereby effectively preventing the arc-shaped battery cell 20 from rebounding after shaping, and improving the stability of the arc-shaped battery cell 20.

[0064] 2. In the arc-shaped battery cell 20 with the shaping structure 10 of the present invention, the second shaping member 200 is wound and arranged on the surface of the arc-shaped battery cell 20, and the second shaping member 200 is perpendicular to the curvature direction of the arc-shaped battery cell 20. The second shaping member 200 can shape and fix the arc-shaped battery cell 20 along the direction perpendicular to the curvature direction of the arc-shaped battery cell 20, thereby improving the shape stability of the arc-shaped battery cell 20. Further, the second shaping member 200 cooperates with the first shaping member 100 to shape and fix the arc-shaped battery cell 20 simultaneously from the curvature direction of the arc-shaped battery cell 20 and the direction perpendicular to the curvature direction, which is equivalent to shaping and fixing the arc-shaped battery cell 20 from the X-axis direction and the Y-axis direction, respectively, thereby effectively improving the shaping effect of the arc-shaped battery cell 20.

[0065] 3. In the arc-shaped battery cell 20 with the shaping structure 10 of the present invention, the first shaping member 100 and the second shaping member 200 intersect and form an intersection node 300, and the first shaping member 100 and the second shaping member 200 are connected at the intersection node 300, so as to prevent the first shaping member 100 from sliding in the vertical direction of the arc direction, and prevent the second shaping member 200 from sliding in the arc direction, thereby improving the stability of the shaping structure 10, thereby improving the stability of the shape of the arc-shaped battery cell 20, and further improving the shaping effect of the arc-shaped battery cell 20. In addition, the first shaping member 100 and the second shaping member 200 are both wound and arranged on the surface of the arc-shaped battery cell 20, which can effectively enhance the shaping durability of the arc-shaped battery cell 20.

[0066] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An arc-shaped battery cell with a shaped structure, characterized in that: The shaping structure comprises a first shaping member and a second shaping member, the first shaping member and the second shaping member are both wound and arranged on the surface of the arc-shaped battery core, the extension direction of the first shaping member is parallel to the curvature direction of the arc-shaped battery core, the extension direction of the second shaping member is at a preset angle to the curvature direction of the arc-shaped battery core, the first shaping member and the second shaping member intersect and form an intersection node, and the first shaping member and the second shaping member are connected at the intersection node; The first shaped member and the second shaped member are connected in a locking manner, wherein the first shaped member is rolled up at the connection to form a first ring, and the second shaped member is rolled up at the connection to form a second ring, and the second ring is inserted into the first ring to form a locking connection.

2. The arc-shaped battery cell with a shaped structure according to claim 1, characterized in that: There are multiple first shaped members, and each of the first shaped members is connected to the second shaped member.

3. The arc-shaped battery cell with a shaped structure according to claim 2, characterized in that: The distance between two adjacent first shaping members gradually increases from the middle of the bent portion of the arc-shaped battery core to both sides of the arc-shaped battery core.

4. The arc-shaped battery cell with a shaped structure according to claim 1, characterized in that: There are multiple second shaped members, and each of the second shaped members is connected to the first shaped member.

5. The arc-shaped battery cell with a shaped structure according to claim 4, characterized in that: The distance between two adjacent second shaping members gradually increases from the bent portion of the arc-shaped battery core to both ends of the arc-shaped battery core.

6. The arc-shaped battery cell with a shaped structure according to claim 1, characterized in that: The arc-shaped battery core is provided with a first groove, and the first shaping member is embedded in the first groove.

7. The arc-shaped battery cell with a shaped structure according to claim 1, characterized in that: The arc-shaped battery core is provided with a second groove, and the second shaping member is embedded in the second groove.

8. The arc-shaped battery cell with a shaped structure according to claim 1, characterized in that: The first shaping member and the second shaping member are arranged perpendicularly.

9. A curved lithium battery, characterized in that: The arc-shaped lithium battery comprises an arc-shaped battery cell with a shaped structure as described in any one of claims 1-8.

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