Battery cell

Abstract

The utility model discloses a single battery. The single battery comprises a shell, a battery cell and a battery cell, the pole group is arranged in the shell and is provided with a pole lug; the end plate is arranged in the shell and located on the side, provided with the tabs, of the pole group, and through holes opposite to the tabs are formed in the end plate; the connecting piece is arranged in the shell and located on the side, away from the pole group, of the end plate, the tabs penetrate through the through holes to be connected with the connecting piece, and part of the tabs connected with the connecting piece are located between the connecting piece and the shell. According to the battery monomer disclosed by the utility model, the internal structure can be ensured to be compact, and the utilization rate of the internal space is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery cell. Background Technology

[0002] In related technologies, the tabs of the electrode assembly occupy a large space inside the housing, resulting in a waste of internal space and low space utilization. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell that ensures a compact internal structure and effectively improves the utilization rate of internal space.

[0004] A battery cell according to an embodiment of the present invention includes: a housing; an electrode assembly disposed within the housing and having tabs; an end plate disposed within the housing and located on the side of the electrode assembly where the tabs are located, the end plate having a through hole opposite to the tabs; and a connecting piece disposed within the housing and located on the side of the end plate away from the electrode assembly, the tabs passing through the through hole to connect with the connecting piece, the portion of the tab connected to the connecting piece being located between the connecting piece and the housing.

[0005] According to the embodiment of the present utility model, the battery cell has an end plate located on the side of the electrode assembly with tabs. The end plate has a through hole opposite to the tabs. The connecting piece is located on the side of the end plate away from the electrode assembly. The tabs pass through the through hole to connect with the connecting piece. The part of the tab connected to the connecting piece is located between the connecting piece and the housing, which realizes the connection requirement between the tabs and the connecting piece, and can reduce the space for folding the tabs. It effectively utilizes the space between the connecting piece and the housing, ensures that the internal structure of the battery cell is compact, and effectively improves the utilization rate of the internal space of the battery cell.

[0006] In addition, the battery cell according to the above embodiments of the present invention may also have the following additional technical features:

[0007] According to some embodiments of the present invention, the battery cell includes: a housing body having an opening opposite to the connecting piece; a sealing assembly covering the opening, wherein the portion of the tab connected to the connecting piece is located between the connecting piece and the sealing assembly.

[0008] According to some embodiments of the present invention, the sealing assembly includes a sealing element and an insulating element, both of which cover the opening, and the insulating element is connected to the end face of the sealing element near the connecting piece.

[0009] According to some embodiments of the present invention, the outer peripheral wall of the shell body is provided with a protrusion extending toward the side away from the electrode group. The protrusion is arranged around the opening and the inner peripheral wall of the protrusion is flush with the hole wall of the opening. The end face of the sealing assembly away from the electrode group is flush with the end face of the protrusion away from the electrode group.

[0010] According to some embodiments of the present invention, the shell body includes: an outer shell, wherein the electrode assembly, the end plate and the connecting piece are all disposed inside the outer shell, and the outer shell has an open opening on one side, the opening being disposed at the end of the outer shell away from the open opening; and a cover plate, the cover plate being disposed over the open opening.

[0011] According to some embodiments of the present invention, a guide portion is provided in the through hole. The guide portion is connected to the hole wall at one end of the through hole along the thickness direction of the electrode group and spaced apart from the hole wall at the other end. In the direction from the electrode group to the connecting piece, the guide portion extends obliquely away from the electrode group. The electrode tab is disposed between the guide portion and the through hole.

[0012] According to some embodiments of the present invention, the electrode group includes a plurality of sub-electrode groups arranged along the thickness direction, the electrode tab includes a plurality of sub-electrode tabs, the plurality of sub-electrode groups and the plurality of sub-electrode tabs are arranged in a one-to-one correspondence, and the through hole is opposite to the plurality of sub-electrode tabs.

[0013] According to some embodiments of the present invention, the through hole includes a plurality of through sub-holes, and the plurality of through sub-holes correspond one-to-one with the plurality of sub-tabs.

[0014] According to some embodiments of the present invention, the battery cell further includes: a terminal post, the terminal post passing through the housing, the terminal post and the tab being spaced apart along the length direction of the electrode group, and the two ends of the connecting piece along the length direction being connected to the tab and the terminal post respectively.

[0015] According to some embodiments of the present invention, the battery cell further includes a bottom support plate, which is disposed inside the housing and located on the side of the electrode assembly away from the tabs.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1This is an exploded view of a single battery cell according to the first embodiment of the present invention from one angle;

[0019] Figure 2 This is an exploded view of a battery cell according to the first embodiment of the present invention from another angle;

[0020] Figure 3 This is a cross-sectional view of a battery cell according to the second embodiment of the present invention;

[0021] Figure 4 yes Figure 3 The center circle shows an enlarged structural diagram at point A.

[0022] Figure 5 This is a cross-sectional view of a battery cell according to the third embodiment of the present invention;

[0023] Figure 6 yes Figure 5 The enlarged structural diagram at point B is shown in the middle circle.

[0024] Figure 7 This is a schematic diagram of the end plate of a battery cell according to the third embodiment of the present invention.

[0025] Figure label:

[0026] 100. Battery cell;

[0027] 10. Housing; 11. Housing body; 12. Sealing assembly; 111. Opening; 112. Boss; 113. Outer shell; 114. Opening; 115. Cover plate; 121. Seal; 122. Insulation;

[0028] 20. Pole group; 21. Pole ear; 201. Sub-pole group; 211. Sub-pole ear;

[0029] 30. End plate; 31. Through hole; 311. Guide section; 312. Through sub-hole;

[0030] 40. Connecting piece;

[0031] 50. Pole post;

[0032] 60. Base plate;

[0033] 70. Insulating film;

[0034] 80. Lower plastic. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "first feature above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0038] The battery cell 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0039] Reference Figures 1-6 As shown, the battery cell 100 according to an embodiment of the present invention may include: a housing 10, an electrode assembly 20, and an end plate 30.

[0040] Specifically, the electrode assembly 20 and the end plate 30 are disposed within the housing 10, and the electrode assembly 20 has a tab 21. The end plate 30 is located on the side of the electrode assembly 20 with the tab 21. The housing 10 can protect the electrode assembly 20, preventing it from being exposed and damaged. At the same time, the end plate 30 can provide support and insulation for the electrode assembly 20, meeting its required support and insulation needs. For example, the tab 21 can be a positive tab or a negative tab.

[0041] In addition, such as Figures 1-6As shown, the end plate 30 has a through hole 31, which is opposite to the electrode tab 21. The battery cell 100 also includes a connecting piece 40, which is disposed inside the housing 10 and is located on the side of the end plate 30 away from the electrode group 20 (e.g., Figure 3 As shown on the upper side), the electrode tab 21 passes through the through hole 31, so that the electrode tab 21 can be connected to the connecting piece 40, thus fulfilling the connection requirement between the electrode tab 21 and the connecting piece 40. The electrode tab 21 can be avoided through the through hole 31, making it easier for the electrode tab 21 to be connected to the connecting piece 40.

[0042] At the same time, such as Figure 4 and Figure 6 As shown, the part of the tab 21 connected to the connecting piece 40 is located between the connecting piece 40 and the housing 10, so that the tab 21 can be extended, thereby reducing the space of the tab 21 and effectively utilizing the space between the connecting piece 40 and the housing 10, ensuring that the internal structure of the battery cell 100 is compact and effectively improving the utilization rate of the internal space of the battery cell 100.

[0043] It should be noted that, for ease of description, the directions such as "front," "rear," "left," "right," "up," and "down" in this utility model are based on the directional relationships shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0044] In some embodiments, such as Figure 4 and Figure 6 As shown, the battery cell 100 also includes a lower plastic 80, which is disposed inside the housing 10 and surrounds the outer peripheral wall of the connecting piece 40. The lower plastic 80 can prevent the connecting piece 40 from contacting the housing 10 and causing short circuits and other problems, thus ensuring the safety of the battery cell 100.

[0045] According to the embodiment of the present utility model, the battery cell 100 has an end plate 30 located on the side of the electrode group 20 where the tabs 21 are provided. The end plate 30 has a through hole 31 opposite to the tabs 21. The connecting piece 40 is located on the side of the end plate 30 away from the electrode group 20. The tabs 21 pass through the through hole 31 to connect with the connecting piece 40. The part of the tab 21 connected to the connecting piece 40 is located between the connecting piece 40 and the housing 10, which realizes the connection requirement between the tabs 21 and the connecting piece 40, and can reduce the space of the tabs 21. It can effectively utilize the space between the connecting piece 40 and the housing 10, ensure that the internal structure of the battery cell 100 is compact, and effectively improve the utilization rate of the internal space of the battery cell 100.

[0046] In some embodiments of this utility model, such as Figures 1-6As shown, the housing 10 includes a housing body 11, on which an opening 111 is provided, which is opposite to the connecting piece 40. Thus, during the assembly of the battery cell 100, the connecting piece 40, the end plate 30, and the electrode assembly 20 are first installed inside the housing 10. The opening 111 allows the tab 21 to be bent, facilitating the connection between the tab 21 and the connecting piece 40, ensuring reliable assembly and improving assembly efficiency.

[0047] In addition, such as Figures 1-6 As shown, the housing 10 also includes a sealing assembly 12, which covers the opening 111. The part of the tab 21 connected to the connecting piece 40 is located between the connecting piece 40 and the sealing assembly 12. The sealing assembly 12 can block the opening 111 to prevent external impurities or liquids from entering the battery cell 100 through the opening 111 or to prevent liquid from flowing out of the battery cell 100, thus meeting the sealing requirements of the battery cell 100 and ensuring reliable sealing.

[0048] According to some embodiments of this utility model, such as Figure 4 and Figure 6 As shown, the sealing assembly 12 includes a sealing element 121 and an insulating element 122. Both the sealing element 121 and the insulating element 122 cover the opening 111. The insulating element 122 is connected to the end face of the sealing element 121 near the connecting piece 40. The sealing element 121 and the insulating element 122 can ensure reliable sealing of the opening 111, thereby ensuring reliable sealing of the battery cell 100. The insulating element 122 can also achieve insulation, preventing short circuits caused by contact between the electrode group 20 and the sealing assembly 12, thus ensuring the safety of the battery cell 100.

[0049] In some embodiments of this utility model, such as Figure 5 and Figure 6 As shown, a boss 112 is provided on the outer peripheral wall of the shell body 11. The boss 112 extends toward the side away from the electrode group 20 and surrounds the opening 111. The inner peripheral wall of the boss 112 is flush with the hole wall of the opening 111. The boss 112 can improve the structural strength at the opening 111 and avoid deformation and other problems. In addition, the end face of the sealing assembly 12 away from the electrode group 20 (e.g. Figure 6 The upper end face shown) and the end face of the boss 112 away from the pole group 20 (e.g. Figure 6 The upper surface shown is flush with the housing 10, which can reduce the space occupied by the sealing component 12 in the housing 10, thereby increasing the internal space of the housing 10 and improving the utilization rate of the internal space of the housing 10.

[0050] According to some embodiments of this utility model, such as Figures 1-3 , Figure 5As shown, the housing body 11 includes an outer shell 113 and a cover plate 115. The electrode assembly 20, end plate 30, and connecting piece 40 are all disposed inside the outer shell 113. The outer shell 113 has an opening 114 on one side, which facilitates the assembly of the electrode assembly 20, end plate 30, and connecting piece 40 into the outer shell 113, ensuring convenient assembly. The cover plate 115 covers the opening 114, which can seal the housing body 11. This allows the outer shell 113 and the cover plate 115 to protect the electrode assembly 20, end plate 30, and connecting piece 40, preventing them from being exposed and damaged, and ensuring reliable protection.

[0051] In addition, such as Figure 5 As shown, the opening 111 is located at the end of the housing 113 away from the open opening 114 (e.g., Figure 3 As shown in the upper part), even if the electrode tab 21 is located on the side of the electrode assembly 20 away from the cover plate 115, it can avoid damage to the electrode tab 21 when the housing 113 is assembled with the cover plate 115, ensuring reliable assembly. When the inner peripheral wall of the end of the housing 113 away from the opening 114 is provided with an R-angle, the electrode assembly 20 is not easy to contact the R-angle of the housing 113 and cause damage, so there is no need to avoid the R-angle of the housing 113, and the R-angle of the housing 113 can be utilized, which is beneficial to improving the utilization rate of the internal space of the housing 10.

[0052] In some embodiments of this utility model, such as Figure 4 and Figure 6 , Figure 7 As shown, a guide portion 311 is provided inside the through hole 31, and the guide portion 311 and the through hole 31 are along the thickness direction of the pole group 20 (e.g., Figure 7 The guide portion 311 is connected to the hole wall at one end (shown in the front-back direction), and the through hole 31 is spaced apart from the hole wall at the other end along the thickness direction of the pole group 20, in the direction from the pole group 20 to the connecting piece 40 (e.g. Figure 3 In the direction from bottom to top, the guide portion 311 extends obliquely away from the pole group 20. The pole tab 21 is inserted between the guide portion 311 and the through hole 31. The guide portion 311 can press the pole tab 21 to shape it and ensure that the pole tab 21 has a good folded shape, thereby ensuring that the pole tab 21 is reliably connected to the connecting piece 40.

[0053] According to some embodiments of this utility model, such as Figures 1-6As shown, the electrode assembly 20 includes multiple sub-electrode assemblies 201 arranged along the thickness direction. The electrode tab 21 includes multiple sub-tabs 211. The multiple sub-electrode assemblies 201 and the multiple sub-tabs 211 are arranged in a one-to-one correspondence. By using multiple sub-electrode assemblies 201, the capacity of a single battery cell 100 can be increased, and the use of the casing 10 can be reduced, thereby lowering production costs and improving the volume utilization rate of the battery cell 100. In addition, the through hole 31 is opposite to the multiple sub-tabs 211, which facilitates the extension of the multiple sub-tabs 211 through the through hole 31 and meets the requirement of avoiding the multiple sub-tabs 211.

[0054] In embodiments of this utility model, the number of sub-pole groups 201 can be flexibly set according to actual conditions. For example, the sub-pole groups 201 can be as follows: Figure 3 The number shown is two, but it can also be three, four, five, six or more, all of which are within the protection scope of this utility model.

[0055] In some embodiments of this utility model, such as Figure 7 As shown, the through hole 31 includes multiple through sub-holes 312, each of which corresponds to a multiple sub-tabs 211, so that the multiple sub-tabs 211 can pass through the multiple through sub-holes 312 respectively, avoiding confusion and making the connection convenient, and facilitating the connection of the multiple sub-tabs 211 with the connecting piece 40.

[0056] According to some embodiments of this utility model, such as Figure 1 , Figures 3-6 As shown, the battery cell 100 also includes a terminal post 50, which passes through the housing 10. The terminal post 50 facilitates the connection of the battery cell 100 to other external structures, meeting the required connection requirements. The terminal post 50 and the tab 21 are along the length direction of the electrode assembly 20 (e.g., along the length direction of the electrode assembly 20). Figure 1 As shown in the left-right direction, the connecting piece 40 is spaced apart, with its two ends along its length connected to the tab 21 and the pole post 50, respectively. This enables the connection between the tab 21 and the pole post 50, and avoids placing the connecting piece and tab entirely below the pole post as in related technologies. This ensures a compact structure and improves the utilization of the internal space of the housing 10. For example, the pole post 50 can be a positive pole post or a negative pole post.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the battery cell 100 also includes a bottom support plate 60, which is disposed inside the housing 10 and located on the side of the electrode assembly 20 away from the tab 21 (e.g., Figure 3 As shown in the lower part, the bottom tray can support and protect the electrode group 20, effectively increasing the structural stability of the battery cell 100, avoiding damage to the electrode group 20, and ensuring the safety of the battery cell 100 in use.

[0058] In some embodiments, such as Figure 1 and Figure 2 As shown, an insulating film 70 is provided between the outer peripheral wall of the electrode assembly 20 and the housing 10. The insulating film 70 can achieve insulation between the electrode assembly 20 and the housing 10, avoiding short circuits and other problems caused by contact between the electrode assembly 20 and the housing 10, and ensuring the safety of the battery cell 100. For example, the insulating film 70 can be a polyester film.

[0059] Other configurations and operations of the battery cell 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0061] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: case; A pole assembly, wherein the pole assembly is disposed within the housing and has pole tabs; An end plate is provided inside the housing and on the side of the electrode assembly where the electrode tabs are located. The end plate has a through hole opposite to the electrode tabs. A connecting piece is disposed inside the housing and located on the side of the end plate away from the electrode assembly. The electrode tab passes through the through hole to connect with the connecting piece, and the portion of the electrode tab connected to the connecting piece is located between the connecting piece and the housing.

2. The battery cell according to claim 1, characterized in that, The housing includes: The shell body has an opening opposite to the connecting piece; A sealing assembly is provided over the opening, and the portion of the tab connected to the connecting piece is located between the connecting piece and the sealing assembly.

3. The battery cell according to claim 2, characterized in that, The sealing assembly includes: A sealing element and an insulating element are provided, both of which cover the opening, and the insulating element is connected to the end face of the sealing element near the connecting piece.

4. The battery cell according to claim 2, characterized in that, The outer peripheral wall of the shell body is provided with a protrusion extending toward the side away from the electrode group. The protrusion is arranged around the opening and the inner peripheral wall of the protrusion is flush with the hole wall of the opening. The end face of the sealing assembly away from the electrode group is flush with the end face of the protrusion away from the electrode group.

5. The battery cell according to claim 2, characterized in that, The shell body includes: The housing, the electrode assembly, the end plate and the connecting piece are all disposed inside the housing, and the housing has an opening on one side, the opening being located at the end of the housing away from the opening; A cover plate, which is disposed over the opening.

6. The battery cell according to claim 1, characterized in that, The through hole is provided with a guide portion, which is connected to the hole wall at one end of the through hole along the thickness direction of the electrode group and spaced apart from the hole wall at the other end. In the direction from the electrode group to the connecting piece, the guide portion extends obliquely away from the electrode group, and the electrode tab passes between the guide portion and the through hole.

7. The battery cell according to claim 1, characterized in that, The electrode group includes multiple sub-electrode groups arranged along the thickness direction, the electrode tab includes multiple sub-electrode tabs, the multiple sub-electrode groups and the multiple sub-electrode tabs are arranged in a one-to-one correspondence, and the through hole is opposite to the multiple sub-electrode tabs.

8. The battery cell according to claim 7, characterized in that, The through hole includes multiple through sub-holes, and each of the multiple through sub-holes corresponds to one of the multiple sub-tabs.

9. The battery cell according to claim 1, characterized in that, Also includes: The electrode post is inserted through the housing, and the electrode post and the electrode tab are spaced apart along the length direction of the electrode group. The two ends of the connecting piece along the length direction are respectively connected to the electrode tab and the electrode post.

10. The battery cell according to claim 1, characterized in that, Also includes: A base plate, which is disposed inside the housing and located on the side of the electrode assembly away from the electrode tab.

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