Soft pack button battery

Abstract

The present invention provides a soft-pack button battery, comprising a winding core, an aluminum-plastic composite film shell and an internal support structure; the winding core and the internal support structure are encapsulated in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet; a positive electrode ear is led out of the positive electrode sheet, and the positive electrode ear passes through the aluminum-plastic composite film shell; a negative electrode ear is led out of the negative electrode sheet, and the negative electrode ear passes through the aluminum-plastic composite film shell; a through hole penetrating the two end faces of the winding core is provided at the axis of the winding core; the internal support structure comprises a first support plate, a second support plate and a support column, the first support plate and the second support plate are respectively located outside the two end faces of the winding core, the support column is penetrated in the through hole, and the two ends of the support column are respectively fixedly connected to the first support plate and the second support plate. Compared with the prior art, the provision of the internal support structure can protect the two end faces of the winding core and avoid internal short circuit of the soft-pack button battery.

Description

Technical Field

[0001] The invention belongs to the technical field of soft-pack batteries, and in particular relates to a soft-pack button battery. Background Art

[0002] Soft-pack batteries are batteries that use polymer (usually aluminum-plastic film) as the outer shell. Compared with hard-shell batteries, soft-pack batteries have the following advantages:

[0003] (1) Good safety. The soft-pack battery structure adopts aluminum-plastic film packaging. When thermal management is out of control or punctured, the aluminum-plastic film shell will provide a buffer space for the battery cell, causing swelling and deformation, and eventually only fire or smoke will occur, but no explosion will occur.

[0004] (2) Light weight and high energy density: Soft-pack batteries are 40% lighter than steel-shell batteries of the same capacity and 20% lighter than aluminum-shell batteries, so they usually have a higher energy density.

[0005] (3) Good electrochemical performance and long life: The internal resistance of soft-pack batteries is small, which can greatly reduce the battery's self-consumption. In addition, soft-pack batteries have a longer cycle life.

[0006] Soft-pack button batteries are a form of soft-pack batteries. Existing soft-pack button batteries include a winding core and an aluminum-plastic composite film shell wrapped around the outside of the winding core. If the end face of the soft-pack button battery is squeezed, the pole piece of the winding core may be damaged and powder may fall off, thereby causing an internal short circuit in the battery. Therefore, the end face of the soft-pack button battery cannot bear force, which easily causes an internal short circuit in the battery. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to provide a soft-pack button battery in view of the problem that when the existing soft-pack button battery is squeezed, its end surface cannot bear the force, which easily leads to an internal short circuit of the battery.

[0008] In order to solve the above technical problems, an embodiment of the present invention provides a soft-package button battery, comprising a winding core, an aluminum-plastic composite film shell and an inner support structure; the winding core and the inner support structure are encapsulated in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet; a positive electrode ear is led out from the positive electrode sheet, and the positive electrode ear passes through the aluminum-plastic composite film shell; a negative electrode ear is led out from the negative electrode sheet, and the negative electrode ear passes through the aluminum-plastic composite film shell;

[0009] A through hole is provided at the axis center of the winding core, which passes through the two end surfaces of the winding core; the internal support structure includes a first support plate, a second support plate and a support column, the first support plate and the second support plate are respectively located outside the two end surfaces of the winding core, the support column is passed through the through hole, and the two ends of the support column are respectively fixedly connected to the first support plate and the second support plate.

[0010] Optionally, the two end surfaces of the winding core include a first end surface and a second end surface, the first support plate is arranged outside the first end surface of the winding core, and the second support plate is arranged outside the second end surface of the winding core;

[0011] The projection of the first support plate on the first end surface of the winding core is located inside the outer edge of the first end surface of the winding core;

[0012] The projection of the second support plate on the second end surface of the winding core is located inside the outer edge of the second end surface of the winding core.

[0013] Optionally, two ends of the support column are respectively connected to the center of the first support plate and the center of the second support plate, and the support column is perpendicular to the first support plate and the second support plate.

[0014] Optionally, the first support plate is a flat plate, the second support plate is a flat plate, and the support column is a cylinder.

[0015] Optionally, the first support plate, the second support plate and the support column are formed separately.

[0016] Optionally, the support column includes a first support column and a second support column; the first support column and the first support plate constitute an integrally formed first inner support member; the second support column and the second support plate constitute an integrally formed second inner support member.

[0017] Optionally, the first support column is a plug-in column, and the second support column is provided with a corresponding plug-in hole; the first support column is plugged into the plug-in hole of the second support column; or

[0018] The second support column is a plug-in column, and the first support column is correspondingly provided with a plug-in hole; the second support column is plugged into the plug-in hole of the first support column.

[0019] Optionally, the cross-sectional shapes of the plug-in column and the plug-in hole correspond to each other.

[0020] Optionally, a tight-fitting portion is provided on the plug-in column.

[0021] Optionally, the positive electrode tab is bonded to one end surface of the aluminum-plastic composite film shell through a first adhesive layer, and the negative electrode tab is bonded to the other end surface of the aluminum-plastic composite film shell through a second adhesive layer.

[0022] Compared with the prior art, the soft-pack button battery provided by the present invention has an internal support structure arranged at the through hole of the winding core. When the two end faces of the soft-pack button battery are squeezed, the squeezing force acts on the internal support structure through the aluminum-plastic composite film shell. The internal support structure protects the two end faces of the winding core, thereby preventing the two end faces of the winding core from being directly collided and squeezed so as to avoid damage to the positive electrode sheet or the negative electrode sheet and powder falling off, thereby preventing internal short circuit of the soft-pack button battery, solving the problem that the two end faces of the soft-pack button battery cannot be squeezed by force, and improving the quality of the soft-pack button battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic cross-sectional view of a soft-package button battery provided in an embodiment of the present invention;

[0024] Figure 2 A schematic cross-sectional view of a soft-package button battery provided in another embodiment of the present invention;

[0025] Figure 3 for Figure 2 Structural schematic diagram of the middle and inner support structure;

[0026] Figure 4 A schematic structural diagram of a first inner support member provided in another embodiment of the present invention;

[0027] Figure 5 A schematic structural diagram of a first inner support member provided in another embodiment of the present invention;

[0028] Figure 6 A schematic structural diagram of an inner support structure provided by another embodiment of the present invention;

[0029] Figure 7 A schematic structural diagram of an inner support structure provided by another embodiment of the present invention;

[0030] Figure 8 A schematic structural diagram of an inner support structure provided in another embodiment of the present invention.

[0031] The reference numerals in the specification are as follows:

[0032] 1. Winding core; 11. Through hole;

[0033] 2. Aluminum-plastic composite film shell;

[0034] 3. Internal support structure; 3a. First internal support member; 3b. Second internal support member;

[0035] 31. First support plate; 32. Second support plate;

[0036] 33. Support column; 331. First support column; 332. Second support column; 333. Plug hole;

[0037] 334, tight fitting portion; 334a, annular protrusion; 334b, convex block; 335, plug-in slot;

[0038] 4. Positive electrode ear; 5. Negative electrode ear; 6. First adhesive layer; 7. Second adhesive layer. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] like Figure 1 As shown, the soft-package button battery provided in the embodiment of the present invention comprises a winding core 1, an aluminum-plastic composite film shell 2 and an inner support structure 3; the winding core 1 and the inner support structure 3 are encapsulated in the aluminum-plastic composite film shell 2, and the winding core 1 is formed by winding a positive electrode sheet, a separator and a negative electrode sheet; a positive electrode ear 4 is led out from the positive electrode sheet, and the positive electrode ear 4 passes through the aluminum-plastic composite film shell 2; a negative electrode ear 5 is led out from the negative electrode sheet, and the negative electrode ear 5 passes through the aluminum-plastic composite film shell 2;

[0041] A through hole 11 penetrating through the two end surfaces of the winding core 1 is provided at the axis center of the winding core 1. The internal support structure 3 includes a first support plate 31, a second support plate 32 and a support column 33. The first support plate 31 and the second support plate 32 are respectively located outside the two end surfaces of the winding core 1. The support column 33 is passed through the through hole 11, and the two ends of the support column 33 are respectively fixedly connected to the first support plate 31 and the second support plate 32.

[0042] Compared with the prior art, the soft-pack button battery provided in the embodiment of the present invention has an internal support structure 3 provided at the through hole 11 of the winding core 1. When the two end faces of the soft-pack button battery are squeezed, the squeezing force acts on the internal support structure 3 through the aluminum-plastic composite film shell 2. The internal support structure 3 protects the two end faces of the winding core 1, thereby preventing the two end faces of the winding core 1 from being directly subjected to collision and squeezing, thereby preventing the positive electrode sheet or the negative electrode sheet from being damaged and powdering, and preventing internal short circuit of the soft-pack button battery. This solves the problem that the two end faces of the soft-pack button battery cannot be squeezed by force, thereby improving the quality of the soft-pack button battery.

[0043] In one embodiment, if Figure 1 As shown, the two end surfaces of the winding core 1 include a first end surface and a second end surface, the first support plate 31 is arranged outside the first end surface of the winding core 1, and the second support plate 32 is arranged outside the second end surface of the winding core 1;

[0044] Specifically, the projection of the first support plate 31 on the first end face of the winding core 1 is located on the inner side of the outer edge of the first end face of the winding core 1; only the height of the soft-pack button battery is increased, and the diameter of the soft-pack button battery is not changed, thereby saving the internal space of the soft-pack button battery to the maximum extent. Compared with other soft-pack button batteries with a hard shell structure, the volume energy density of the soft-pack button battery is improved.

[0045] Preferably, the first support plate 31 is a circular plate, and the diameter of the first support plate 31 is smaller than the diameter of the winding core 1 .

[0046] Specifically, the projection of the second support plate 32 on the second end face of the winding core 1 is located on the inner side of the outer edge of the second end face of the winding core 1; only the height of the soft-pack button battery is increased, and the diameter of the soft-pack button battery is not changed, thereby saving the internal space of the soft-pack button battery to the maximum extent. Compared with other soft-pack button batteries with a hard shell structure, the volume energy density of the soft-pack button battery is improved.

[0047] Preferably, the second support plate 32 is a circular plate, and the diameter of the second support plate 32 is smaller than the diameter of the winding core 1 .

[0048] In one embodiment, if Figure 1 As shown, the first end of the support column 33 is connected to the center of the first support plate 31, and the second end of the support column 33 is connected to the center of the second support plate 32; the support column 33 provides better support for the first support plate 31 and the second support plate 32, thereby preventing the support column 33 from being supported on the edges of the first support plate 31 and the second support plate 32, causing the first support plate 31 and the second support plate 32 to be easily squeezed and deformed, thereby being squeezed to the end surface of the winding core 1.

[0049] Preferably, the support column 33 is perpendicular to the first support plate 31 and the second support plate 32 ; the support column 33 can better support the first support plate 31 and the second support plate 32 .

[0050] Specifically, the first support plate 31 is a flat plate, which can make the positive electrode ear 4 fit more closely and more stably pressed against the first end surface of the aluminum-plastic composite film shell 2; and can also prevent the first support plate 31 from piercing the aluminum-plastic composite film shell 2;

[0051] The second support plate 32 is a flat plate, which can make the negative electrode ear 5 fit more closely and more stably pressed against the second end surface of the aluminum-plastic composite film shell 2; and can also prevent the second support plate 32 from piercing the aluminum-plastic composite film shell 2;

[0052] The support column 33 is a cylinder, which is convenient for installation with the winding core 1 and avoids scratching the winding core 1 during installation.

[0053] Preferably, the inner support structure 3 is made of PP (polypropylene) material; PP material has high strength and can withstand a certain extrusion pressure; it is light in weight and can reduce the overall weight of the soft-pack button battery; it has good chemical resistance and can avoid corrosion by electrolyte; it has good electrical insulation and can avoid short circuits inside the soft-pack button battery.

[0054] In one embodiment, the first support plate 31, the second support plate 32 and the support column 33 are formed separately, which reduces the manufacturing difficulty and facilitates processing and installation.

[0055] When manufacturing a soft-pack button battery, first wind the positive electrode sheet, the separator and the negative electrode sheet to form a winding core 1; then use PP material to process the first support plate 31, the second support plate 32 and the support column 33 respectively; then insert the support column 33 into the center hole of the winding core 1, and then install the first support plate 31 and the second support plate 32 at the two ends of the winding core 1 respectively, and fix them to the support column 33; then use the aluminum-plastic composite film shell 2 to encapsulate the winding core 1 and the internal support structure 3, and finally bend the positive electrode ear 4 and the negative electrode ear 5 to the two end surfaces of the aluminum-plastic composite film shell 2 respectively and fix them.

[0056] In another embodiment, the first support plate 31 and the support column 33 are integrally formed; or

[0057] The second support plate 32 and the support column are integrally formed, which facilitates the installation of the inner support structure 3 and the winding core 1 .

[0058] In another embodiment, if Figure 2 As shown, the support column 33 includes a first support column 331 and a second support column 332; the first support column 331 and the first support plate 31 constitute an integrally formed first inner support member 3a; the second support column 332 and the second support plate 32 constitute an integrally formed second inner support member 3b; which facilitates the installation of the inner support structure 3 and the winding core 1.

[0059] Specifically, Figure 3 and Figure 6 As shown, the first support column 331 is a plug-in column, and the second support column 332 is provided with a plug-in hole 333 correspondingly; the first support column 331 is plugged into the plug-in hole 333 on the second support column 332;

[0060] Alternatively, the second support column 332 is a plug-in column, and a corresponding plug-in hole is provided on the first support column 331; the second support column 332 is plugged into the plug-in hole on the first support column 331; the connection is more stable, avoiding sliding of the first inner support member 3a and the second inner support member 3b, and the structure is simple, which is easy to process and install.

[0061] Preferably, the cross-sectional shapes of the plug-in column and the plug-in hole 333 correspond to each other, and are circular, polygonal or any other irregular shapes, so as to facilitate the matching installation of the plug-in column and the plug-in hole 333.

[0062] Optionally, the plug-in column is a cylinder and the plug-in hole 333 is a round hole; it is more convenient to install and no specific installation alignment is required.

[0063] Optionally, the plug-in column is a square column, and the plug-in hole is a square hole; the plug-in column is prevented from rotating in the plug-in hole, so that the connection between the first inner support member 3a and the second inner support member 3b is more stable.

[0064] In another embodiment, if Figure 7 As shown, there are two plug-in posts and two plug-in holes 333 , and the plug-in posts correspond to the plug-in holes 333 one by one; the stability of the connection between the first inner support member 3a and the second inner support member 3b is improved, and the plug-in posts are prevented from rotating in the plug-in holes 333 .

[0065] In another embodiment, if Figure 8 As shown, the first support column 331 is a plug-in column, and the second support column 332 is correspondingly provided with a plug-in groove 335; the first support column 331 is plugged into the plug-in groove 335 on the second support column 332, which is easy to process.

[0066] In one embodiment, if Figure 4 and Figure 5 As shown, a tight-fitting portion 334 is provided on the plug-in post to enhance the tightness and stability of the connection between the plug-in post and the plug-in hole 333 .

[0067] Specifically, Figure 4 As shown, the tight fitting portion 334 is an annular protrusion 334a on the outer periphery of the plug-in post.

[0068] Specifically, Figure 5 As shown, the tight-fitting portion 334 is a plurality of protrusions 334b ​​arranged around the outer circumference of the plug-in post, and the plurality of protrusions 334b ​​are evenly distributed around the outer circumference of the plug-in post.

[0069] In one embodiment, if Figure 1 As shown, the positive electrode ear 4 passes through the aluminum-plastic composite film shell 2 and is fixed on an end surface formed on the outer surface of the aluminum-plastic composite film shell 2;

[0070] The negative pole ear 5 passes through the aluminum-plastic composite film shell 2 and is fixed on the other end face formed on the outer surface of the aluminum-plastic composite film shell 2; the soft-pack button battery can replace the hard-shell battery and be directly installed in the battery compartment with extrusion-type (such as upper and lower spring plates or spring contacts) electrical connection. The internal support structure 3 plays an internal support role for the positive pole ear 4 and the negative pole ear 5, and presses the positive pole ear 4 and the negative pole ear 5 tightly against the electronic components of the battery compartment, respectively, to ensure the stability of the extrusion electrical connection, so that the application of soft-pack button batteries is more extensive.

[0071] Preferably, if Figure 1As shown, the positive electrode ear 4 is bonded to one end surface of the aluminum-plastic composite film shell 2 through the first adhesive layer 6, and the negative electrode ear 5 is bonded to the other end surface of the aluminum-plastic composite film shell 2 through the second adhesive layer 7; there is no need to use welding for connection, which reduces the processing difficulty and avoids the influence of welding on the soft-pack button battery; the positive electrode ear 4 and the negative electrode ear 5 directly contact the electronic components, which reduces the connection impedance and the connection structure is simple and stable.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft-pack button battery, It is characterized in that It comprises a winding core, an aluminum-plastic composite film shell and an inner supporting structure; the winding core and the inner supporting structure are encapsulated in the aluminum-plastic composite film shell, and the winding core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet; A positive electrode ear is led out from the positive electrode sheet; the positive electrode ear passes through the aluminum-plastic composite film shell and is fixed on one end surface formed on the outer surface of the aluminum-plastic composite film shell; a negative electrode ear is led out from the negative electrode sheet, the negative electrode ear passes through the aluminum-plastic composite film shell and is fixed on the other end surface formed on the outer surface of the aluminum-plastic composite film shell; A through hole is provided at the axis of the winding core and passes through the two end surfaces of the winding core; the inner support structure includes a first support plate, a second support plate and a support column, the support column is passed through the through hole, and the two ends of the support column are fixedly connected to the first support plate and the second support plate respectively; The two end surfaces of the winding core include a first end surface and a second end surface, the first support plate is arranged outside the first end surface of the winding core, and the second support plate is arranged outside the second end surface of the winding core; The projection of the first support plate on the first end surface of the winding core is located inside the outer edge of the first end surface of the winding core; The projection of the second support plate on the second end surface of the winding core is located inside the outer edge of the second end surface of the winding core; The internal support structure is used to internally support the positive electrode tab and the negative electrode tab.

2. The soft-pack button battery according to claim 1, It is characterized in that Two ends of the support column are respectively connected to the center of the first support plate and the center of the second support plate, and the support column is perpendicular to the first support plate and the second support plate.

3. The soft-pack button battery according to claim 1, It is characterized in that The first support plate is a flat plate, the second support plate is a flat plate, and the support column is a cylinder.

4. The soft-pack button battery according to claim 1, It is characterized in that The first support plate, the second support plate and the support column are formed separately.

5. The soft-pack button battery according to claim 1, It is characterized in that The support column comprises a first support column and a second support column; the first support column and the first support plate constitute an integrally formed first inner support member; the second support column and the second support plate constitute an integrally formed second inner support member.

6. The soft-pack button battery according to claim 5, It is characterized in that The first support column is a plug-in column, and the second support column is provided with a corresponding plug-in hole; the first support column is plugged into the plug-in hole on the second support column; or The second support column is a plug-in column, and the first support column is correspondingly provided with a plug-in hole; the second support column is plugged into the plug-in hole on the first support column.

7. The soft-pack button battery according to claim 6, It is characterized in that The cross-sectional shapes of the plug-in column and the plug-in hole correspond to each other.

8. The soft-pack button battery according to claim 6, It is characterized in that The plug-in column is provided with a tight-fitting portion.

9. The soft-pack button battery according to claim 1, It is characterized in that The positive electrode ear is bonded to one end surface of the aluminum-plastic composite film shell through a first adhesive layer, and the negative electrode ear is bonded to the other end surface of the aluminum-plastic composite film shell through a second adhesive layer.

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