Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a shell and a pole piece assembly, at least one end of the shell is concave inwards in the preset direction, so that a convex part is formed in the shell, and a concave cavity is formed in the corresponding position of the exterior of the shell; the pole piece assembly is arranged in the shell, an installation through hole extending in the preset direction is formed in the pole piece assembly, and the pole piece assembly is arranged outside the protruding part in a sleeving mode through the installation through hole. The structure of the shell and the pole piece in the prior art is changed, one end of the shell is sunken towards the interior of the shell, so that the convex part is formed when the shell is internally seen, the concave cavity is formed when the shell is externally seen, the pole piece assembly is arranged on the convex part in a sleeving manner through the mounting through hole, and the outer surface of the pole piece assembly is in contact with the shell; the interior of the pole piece assembly is in contact with the lug boss, so that the heat conduction area is increased, heat can be quickly dissipated through the cavity, the cooling speed is accelerated, the cooling effect is improved, and the performance and the service life of the battery cell are ensured.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an electric core. Background Art

[0002] Currently, with the rapid development of technology, lithium electric cores have been applied in all aspects of life, such as mobile phones, laptops, new energy vehicles, power storage stations, etc. in daily applications. Lithium-ion electric cores can be divided into cylindrical batteries, square aluminum shell batteries, soft-pack electric cores, etc. from the structure. These all install the electrode group in a cylindrical shell or a square shell, and only the outer wall of the electrode group contacts the cylindrical shell or the square shell, with a small contact area and poor heat conduction ability, resulting in poor heat dissipation performance, thereby reducing the service performance and life of the lithium electric core. Utility Model Content

[0003] The purpose of this application is to provide an electric core, which to a certain extent solves the technical problem in the prior art that in a lithium electric core, only the outer wall of the internal electrode group contacts the shell, with a small contact area and poor heat conduction ability, resulting in poor heat dissipation performance, thereby reducing the service performance and life of the lithium electric core.

[0004] This application provides an electric core, including: a shell and an electrode plate assembly; wherein, along a preset direction, at least one end of the shell is concave inward to form a convex portion inside the shell, and a concave cavity is formed at a corresponding position outside the shell.

[0005] The electrode plate assembly is arranged inside the shell, and the electrode plate assembly is formed with an installation through hole extending along the preset direction, and is sleeved outside the convex portion through the installation through hole.

[0006] In the above technical solution, further, the convex portion extends along the preset direction and abuts against the other end of the shell.

[0007] In any of the above technical solutions, further, along the preset direction, one end of the shell is concave inward to form a convex portion inside the shell.

[0008] In any of the above technical solutions, further, the shell includes a main shell body and a cover plate connected to each other; wherein, the inside of the main shell body is hollow and one end along the preset direction is open; the electrode plate assembly is installed inside the main shell body, and the opening of the shell is covered by the cover plate; along the preset direction, the closed end of the main shell body is concave inward to form a convex portion inside the main shell body.

[0009] In any of the above technical solutions, further, a flanging portion is formed on the outer periphery of the open end of the main shell body, and the cover plate abuts against the flanging portion.

[0010] In any of the above technical solutions, further, the cover plate is connected to the main housing by welding or fastening members.

[0011] In any of the above technical solutions, further, the pole piece assembly forms a positive tab cluster and a negative tab cluster, and both the positive tab cluster and the negative tab cluster extend to the outside of the housing after being bent; an insulating diaphragm is provided between the positive tab cluster and the negative tab cluster and the housing.

[0012] In any of the above technical solutions, further, along a direction perpendicular to the preset direction, the positive tab cluster and the negative tab cluster are respectively arranged on opposite sides of the pole piece assembly.

[0013] In any of the above technical solutions, further, an insulating diaphragm is provided between the pole piece assembly and the housing.

[0014] In any of the above technical solutions, further, the pole piece assembly includes a positive electrode plate, a negative electrode plate and a separator; wherein, the numbers of the positive electrode plates and the negative electrode plates are both multiple, and they are stacked alternately, and the separator is provided between any adjacent positive electrode plate and negative electrode plate; both the positive electrode plate and the negative electrode plate are annular plates.

[0015] In any of the above technical solutions, further, the protruding portion is cylindrical, the housing is cylindrical, and the pole piece assembly is an annular structure respectively adapted to the protruding portion and the housing.

[0016] In any of the above technical solutions, further, the protruding portion is formed by stamping.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] In the present application, the structures of the housing and the pole pieces in the prior art are changed, so that one end of the housing is recessed towards its interior, that is, concave inward. Thus, a protruding portion is formed when viewed from the inside of the housing, and a concave cavity is formed when viewed from the outside of the housing. And mounting through holes are designed on the pole piece assembly and sleeved on the protruding portion. In addition to the outer surface of the pole piece assembly contacting the housing, the interior of the pole piece assembly contacts the entire outer wall of the protruding portion, increasing the area of heat conduction, and the heat conducted can be quickly dissipated through the cavity, accelerating the cooling speed, greatly improving the cooling effect, and helping to ensure the performance and life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of the pole piece assembly provided by the embodiment of the present application;

[0021] Figure 2 Structural schematic diagram of the main housing provided by the embodiment of the present application;

[0022] Figure 3 Another structural schematic diagram of the main housing provided by the embodiment of the present application

[0023] Figure 4 is Figure 3 Cross-sectional view along the A-A section;

[0024] Figure 5 Structural schematic diagram of the battery cell provided by the embodiment of the present application;

[0025] Figure 6 Another structural schematic diagram of the battery cell provided by the embodiment of the present application;

[0026] Figure 7 is Figure 6 Cross-sectional view along the B-B section.

[0027] Reference numerals:

[0028] 1 - Outer shell, 11 - Main housing, 111 - Protruding part, 112 - Concave cavity, 113 - Flanging part, 12 - Cover plate, 2 - Pole piece assembly, 21 - Positive ear cluster, 22 - Negative ear cluster, 23 - Mounting through hole. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions of the present application in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments.

[0030] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application.

[0031] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] Next, refer to Figures 1 to 7 to describe the battery cell according to some embodiments of the present application.

[0035] See Figures 1 to 7 As shown, an embodiment of the present application provides a battery cell, including: a housing 1 and a pole piece assembly 2; wherein, along a preset direction, at least one end of the housing 1 is concave inward, so as to form a convex portion 111 inside the housing 1 and a concave cavity 112 at a corresponding position outside the housing 1;

[0036] The pole piece assembly 2 is disposed inside the housing 1, and the pole piece assembly 2 is formed with a mounting through hole 23 extending along the preset direction, and is sleeved outside the convex portion 111 through the mounting through hole 23.

[0037] According to the structure described above, in the present application, the structures of the housing and the pole piece in the prior art are changed. One end of the housing 1 is recessed toward its interior, that is, concave inward. Thus, a convex portion 111 is formed when viewed from the inside of the housing 1, and a concave cavity 112 is formed when viewed from the outside of the housing 1. And a mounting through hole 23 is designed on the pole piece assembly 2 and is sleeved on the convex portion 111 through the mounting through hole 23. In addition to the outer surface of the pole piece assembly 2 contacting the housing 1, the interior of the pole piece assembly 2 contacts the entire outer wall of the convex portion 111, increasing the heat conduction area, and the heat conducted can be quickly dissipated through the cavity, accelerating the cooling speed, greatly improving the cooling effect, and helping to ensure the performance and life of the battery cell.

[0038] Further, preferably, the preset direction may be the height direction of the housing 1. Of course, it is not limited thereto, and it may also be the length direction or the width direction of the housing 1, or other directions, etc., and is specifically selected according to actual needs.

[0039] In this embodiment, preferably, as Figure 4 shown, the convex portion 111 extends along the preset direction and abuts against the other end of the housing 1.

[0040] According to the structure described above, it can be seen that the convex portion 111 extends and supports under the other end of the housing 1, that is, the cover plate 12 described below, and also plays a supporting role for the cover plate 12, which helps to improve the overall strength. Of course, it is not limited thereto, and there may also be a certain gap between the convex portion 111 and the inner side of the cover plate 12, which is specifically selected according to actual needs.

[0041] In this embodiment, preferably, as Figure 2 and Figure 4 shown, along the preset direction, one end of the housing 1 is concave inward to form a convex portion 111 inside the housing 1.

[0042] According to the structure described above, it can be seen that along the preset direction, only one end of the housing 1 is provided with a concave structure to form the convex portion 111, which not only meets the assembly requirements but also facilitates processing, manufacturing and assembly.

[0043] It should be noted that: along the preset direction, it is not limited to only making one end of the housing 1 concave inward to form the aforementioned convex portion 111. It is also possible to make both ends of the housing 1 concave inward along the preset direction to form convex portions 111 at both ends of the housing 1. For example: concave structures are provided on both the main housing 11 and the cover plate 12 described below, so that convex portions 111 are formed on the sides of the main housing 11 and the cover plate 12 close to each other, and they can be assembled with the pole piece assembly 2 at the same time. Compared with the structure in this embodiment, the structure is relatively complex.

[0044] In this embodiment, preferably, as Figures 2 to 7 shown, the housing 1 includes a connected main housing 11 and a cover plate 12; wherein, the inside of the main housing 11 is hollow and one end along the preset direction is open; the pole piece assembly 2 is installed in the main housing 11 and the opening of the housing 1 is sealed by the cover plate 12; along the preset direction, the closed end of the main housing 11 is concave inward to form a convex portion 111 inside the main housing 11.

[0045] According to the structure described above, it can be seen that designing the housing 1 into two parts facilitates operations such as installing the pole piece assembly 2 into it and filling it with electrolyte, which helps to improve the assembly efficiency.

[0046] It should be noted that: The structure of the outer shell 1 is not limited to the above, and other structures can also be adopted. For example, the outer shell 1 includes a main housing 11, a first cover plate 12, and a second cover plate 12. Along the preset direction, the interior of the main housing 11 is hollow and openings are formed at both ends. The first cover plate 12 and the second cover plate 12 are respectively installed at the two open ends of the main housing 11 to cover the electrode assembly 2, and the second cover plate 12 can be concave to form the aforementioned convex portion 111. Of course, this is only an example. The structure of the outer shell 1 can also be other, and it is specifically designed according to actual needs.

[0047] In addition, the outer shell 1 is filled with electrolyte, which is prior art and will not be elaborated here.

[0048] In this embodiment, preferably, as Figure 2 , Figure 5 and Figure 7 shown, a flanging portion 113 is formed on the outer periphery of the open end of the main housing 11, and the cover plate 12 is arranged to abut against the flanging portion 113.

[0049] According to the structure described above, the cover plate 12 is installed on the flanging portion 113, which increases the assembly area with the cover plate 12 and improves the stability and firmness of the assembly.

[0050] It should be noted that: Instead of designing a flanging structure at the opening of the main housing 11, the cover plate 12 can be formed with an annular plugging convex portion 111. This annular plugging convex portion 111 can be plugged into the main housing 11 and is arranged to abut against the inner wall of the main housing 11, which can also increase the assembly area of the cover plate 12 and the main housing 11 and improve the stability and firmness of their cooperation.

[0051] In this embodiment, preferably, the cover plate 12 and the main housing 11 are connected by welding.

[0052] Furthermore, preferably, a sealing ring can be provided at the mating portion of the main housing 11 and the cover plate 12, or an insulating member such as a plastic part can be provided on the inner side of the cover plate 12, that is, on the side close to the electrode assembly 2, to play an insulating role, or both the sealing ring and the insulating member can be provided.

[0053] According to the structure described above, the cover plate 12 and the main housing 11 are welded together, and the overall strength is high and it is not easily damaged.

[0054] It should be noted that: The connection between the cover plate 12 and the main housing 11 is not limited to being connected by welding, and can also be connected by fastening members such as bolts.

[0055] In this embodiment, preferably, as Figure 1 and Figure 5As shown, the electrode assembly 2 is formed with a positive tab cluster 21 and a negative tab cluster 22, and both the positive tab cluster 21 and the negative tab cluster 22 extend to the outside of the housing 1 after being bent. That is to say, two through holes are provided in the housing 1, and the positive tab cluster 21 and the negative tab cluster 22 extend to the outside of the housing 1 through the corresponding through holes respectively; an insulating diaphragm is provided between the positive tab cluster 21 and the negative tab cluster 22 and the housing 1, which plays a role of insulation protection to avoid short circuit.

[0056] According to the structure described above, the positive tab cluster 21 and the negative tab cluster 22 extend to the outside of the housing 1, which is convenient for the connection between the tab clusters during the assembly of multiple battery cells. Moreover, directly extending the positive tab cluster 21 and the negative tab cluster 22 to the outside of the housing 1 reduces structures such as connection pieces, helps to reduce the internal resistance, and helps to save the space inside the housing 1, and helps to increase the capacity of the battery cell.

[0057] In this embodiment, preferably, as Figure 1 shown, along the direction perpendicular to the preset direction, the positive tab cluster 21 and the negative tab cluster 22 are respectively arranged on opposite sides of the electrode assembly 2.

[0058] According to the structure described above, the positive tab cluster 21 and the negative tab cluster 22 are respectively located on both sides of the electrode assembly 2, avoiding contact short circuit or interference with each other, improving the safety and reliability of the battery, and facilitating the connection between the tab clusters when multiple battery cells are assembled together, avoiding problems such as interference.

[0059] It should be noted that: the arrangement of the positive tab cluster 21 and the negative tab cluster 22 is not limited to the above, and the two can also be arranged on the non-opposite sides of the electrode assembly 2, and are specifically selected according to actual needs.

[0060] In this embodiment, preferably, an insulating diaphragm (not shown in the figure) is provided between the electrode assembly 2 and the housing 1. That is to say, an insulating diaphragm is provided between the mounting through hole 23 of the electrode assembly 2 and the convex portion 111, an insulating diaphragm is provided between the outer side wall of the electrode assembly 2 and the inner side of the housing 1, along the preset direction, insulating diaphragms are respectively provided at both ends of the electrode assembly 2 and both ends of the housing 1, and insulating diaphragms are also provided between the aforementioned positive tab cluster 21 and negative tab cluster 22 and the housing 1.

[0061] According to the structure described above, an insulating diaphragm is provided between the electrode assembly 2 and the housing 1, which plays a role of all-round insulation protection, avoiding problems such as short circuit, and is safer and more reliable.

[0062] In this embodiment, preferably, as Figure 1As shown, the number of positive electrode plates and negative electrode plates is multiple, and they are stacked alternately, and a separator is provided between any adjacent positive electrode plate and negative electrode plate. That is to say, one positive electrode plate, one separator, one negative electrode plate, one separator, one positive electrode plate, one separator, one negative electrode plate... are stacked in sequence; both the positive electrode plate and the negative electrode plate are annular plates, which is convenient for forming the aforementioned mounting through hole 23 after assembly, and is convenient for sleeving on the convex portion 111. Moreover, preferably, after multiple positive electrode plates, multiple negative electrode plates, and multiple separators are stacked, separators can also be provided at the top and bottom of the whole along the stacking direction. In addition, a mylar film can also be provided to wrap the above-mentioned overall structure, and the mylar film is formed with an opening to play a role in avoiding the ear cluster, etc.

[0063] Furthermore, preferably, the mounting through hole 23 of the electrode assembly 2 is opened at its center. Of course, it is not limited to this.

[0064] In this embodiment, preferably, as Figures 1 to 7 shown, the convex portion 111 is cylindrical, the housing 1 is cylindrical, and the electrode assembly 2 is an annular structure respectively adapted to the convex portion 111 and the housing 1.

[0065] According to the structure described above, the electrode assembly 2 adopts an annular structure, the convex portion 111 adopts a cylindrical structure, and the housing 1 adopts a cylindrical structure, with a more regular shape, which is convenient for assembly and manufacturing.

[0066] It should be noted that: the convex portion 111 is not limited to a cylindrical shape, but can also be a prismatic shape or other shapes; the housing 1 is not limited to a cylindrical shape, but can also be a prismatic shape or other shapes; correspondingly, the electrode assembly 2 is not limited to an annular structure, its inner ring is adapted to the convex portion 111, that is, it changes with the shape of the convex portion 111, and its outer ring is adapted to the housing 1, that is, it changes with the shape of the housing 1.

[0067] In this embodiment, preferably, the convex portion 111 is formed by stamping. That is to say, the aforementioned main housing 11 is formed by stamping, with a mature process, high dimensional accuracy, and higher production efficiency.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, Comprising: a housing and a pole piece assembly; wherein, along a preset direction, at least one end of the housing is recessed inward to form a raised portion inside the housing, and a concave cavity is formed at a corresponding position outside the housing; The pole piece assembly is disposed inside the housing, and the pole piece assembly is formed with a mounting through hole extending along the preset direction, and is sleeved outside the raised portion through the mounting through hole.

2. The battery cell according to claim 1, wherein, The raised portion extends along the preset direction and abuts against the other end of the housing.

3. The battery cell according to claim 1, wherein, Along the preset direction, one end of the housing is recessed inward to form a raised portion inside the housing.

4. The cell according to claim 3, wherein The housing includes a main housing and a cover plate connected to each other; wherein, the inside of the main housing is hollow and one end along the preset direction is open; the pole piece assembly is installed inside the main housing, and the opening of the housing is covered by the cover plate; along the preset direction, the closed end of the main housing is recessed inward to form a raised portion inside the main housing.

5. The cell according to claim 4, wherein A flanging portion is formed on the outer periphery of the open end of the main housing, and the cover plate abuts against the flanging portion; and / or The cover plate and the main housing are connected by welding or fastening members.

6. The battery cell according to claim 1, wherein, The pole piece assembly is formed with a positive ear cluster and a negative ear cluster, and both the positive ear cluster and the negative ear cluster extend to the outside of the housing after being bent; an insulating diaphragm is provided between the positive ear cluster and the negative ear cluster and the housing.

7. The cell according to claim 6, wherein Along a direction perpendicular to the preset direction, the positive ear cluster and the negative ear cluster are respectively disposed on opposite sides of the pole piece assembly.

8. The battery cell according to claim 1, wherein An insulating diaphragm is provided between the pole piece assembly and the housing.

9. The cell according to claim 1, characterized in that, The pole piece assembly includes a positive electrode sheet, a negative electrode sheet and a separator; wherein, the number of both the positive electrode sheet and the negative electrode sheet is multiple, and they are stacked alternately, and the separator is provided between any adjacent positive electrode sheet and negative electrode sheet; both the positive electrode sheet and the negative electrode sheet are annular sheets.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The raised portion is cylindrical, the housing is cylindrical, and the pole piece assembly is a circular ring structure respectively adapted to the raised portion and the housing; and / or The raised portion is formed by stamping.

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