Battery cell and battery with same

Abstract

The utility model discloses a battery cell and a battery with the same, and the battery cell comprises a plurality of first polarity pole pieces, a plurality of second polarity pole pieces and first diaphragms positioned between the first polarity pole pieces and the second polarity pole pieces, the first diaphragm is folded and is sequentially overlapped with the plurality of first polarity pole pieces and the plurality of second polarity pole pieces; the first polarity pole piece is provided with a positioning hole, the second polarity pole piece is provided with a first side and a second side which are opposite to each other in the thickness direction of the first polarity pole piece, the first side is provided with a positioning bulge corresponding to the positioning hole, and the positioning bulge of the second polarity pole piece is embedded into the positioning hole of the adjacent first polarity pole piece. According to the battery cell disclosed by the embodiment of the utility model, dislocation and diaphragm wrinkling between the first polarity pole piece and the second polarity pole piece can be avoided, and meanwhile, the safety performance of the battery cell can also be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery having the same. Background Technology

[0002] A battery cell is typically a structure formed by alternating stacks of positive electrode plates, negative electrode plates, and a separator. Since the positive and negative electrode plates are not fixed together, equipment fluctuations in subsequent processes can cause misalignment of the positive and negative electrode plates. The misaligned parts are prone to lithium plating. At the same time, misalignment of the positive and negative electrode plates can also cause wrinkles in the separator, which is also prone to lithium plating. When there is too much lithium plating, it can easily puncture the separator, causing a short circuit between the positive and negative electrode plates, which greatly reduces the safety of the battery cell. Utility Model Content

[0003] This utility model provides a battery cell to solve the problem of misalignment between the positive and negative electrodes in related technologies, thereby avoiding misalignment between the positive and negative electrodes of the battery cell.

[0004] The battery cell of this utility model embodiment includes a first polarity electrode, a second polarity electrode, and a first separator located between the first polarity electrode and the second polarity electrode;

[0005] The first polar electrode has a positioning hole, and the second polar electrode has a first side and a second side opposite to each other in its thickness direction. The first side has a positioning protrusion corresponding to the positioning hole, and the positioning protrusion of the second polar electrode is embedded in the positioning hole of the adjacent first polar electrode.

[0006] To address the issue of misalignment between the positive and negative electrodes in battery cells in related technologies, the battery cell of this invention features a positioning hole on the first polarity electrode and a positioning protrusion on the second polarity electrode that can be embedded in the positioning hole. This prevents misalignment of the first and second polarity electrodes, thereby also preventing wrinkling of the separator and thus avoiding lithium plating in the battery cell. This significantly improves the safety performance of the battery cell of this invention.

[0007] Therefore, the battery cell of this utility model embodiment can avoid misalignment between the first polarity electrode and the second polarity electrode and wrinkling of the separator, and can also improve the safety performance of the battery cell.

[0008] In some embodiments, a positioning groove corresponding to the positioning protrusion is provided on a second side of the second polarity electrode.

[0009] The positioning protrusion of the second polarity sheet located on one side of the thickness direction of the first polarity sheet passes through the positioning hole of the first polarity sheet and is embedded in the positioning groove of the second polarity sheet located on the other side of the thickness direction of the first polarity sheet.

[0010] In some embodiments, the first polar electrode is a positive electrode and the second polar electrode is a negative electrode; or, the first polar electrode is a negative electrode and the second polar electrode is a positive electrode.

[0011] In some embodiments, there are multiple positioning holes, which are spaced apart circumferentially along the first polarity electrode.

[0012] In some embodiments, the first polar electrode is a polygonal sheet, and the plurality of positioning holes are distributed at the corners of the first polar electrode, or

[0013] The first polarity electrode is a circular sheet, and multiple positioning holes are spaced apart along the circumference of the first polarity electrode.

[0014] In some embodiments, the number of positioning holes is 2-4, and the diameter of the positioning holes is 2-10 mm.

[0015] In some embodiments, there are multiple positioning protrusions, and each of the multiple positioning protrusions corresponds to one of the positioning holes; there are multiple positioning grooves, and each of the multiple positioning grooves corresponds to one of the positioning protrusions.

[0016] The positioning protrusion is a spherical crown-shaped protrusion, and the positioning groove is a spherical crown-shaped groove.

[0017] In some embodiments of the present invention, the battery cell further includes a second diaphragm, which is disposed around the battery cell to wrap the battery cell. One end of the second diaphragm is connected to the first diaphragm, and the other end of the second diaphragm is connected to the first diaphragm or the second diaphragm through insulating tape.

[0018] In some embodiments, the battery cell has a laminated structure.

[0019] This utility model also provides a battery.

[0020] The battery of this utility model embodiment includes the battery cell described in the above embodiment.

[0021] By configuring the battery cell of the above embodiment, the battery of this utility model can avoid misalignment between the first polarity electrode and the second polarity electrode and wrinkling of the separator, and can also improve the safety performance of the battery of this utility model. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is one of the structural schematic diagrams of the battery cell according to an embodiment of this utility model;

[0024] Figure 2 This is the second schematic diagram of the battery cell structure according to an embodiment of this utility model;

[0025] Figure 3 This is a cross-sectional view of the first polarity electrode and the second polarity electrode of the battery cell according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 Enlarged view of part A in the middle;

[0027] Figure 5 This is a side view of a stacked battery according to an embodiment of the present invention;

[0028] Figure 6 yes Figure 5 A magnified view of part B in the middle.

[0029] In the picture:

[0030] 1. First polarity electrode;

[0031] 2. Second polarity electrode;

[0032] 3. First diaphragm;

[0033] 4. Positioning holes;

[0034] 5. Positioning protrusion;

[0035] 6. Positioning groove;

[0036] 7. Second diaphragm;

[0037] 8. Insulating tape. Detailed Implementation

[0038] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0039] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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 do not 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. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] 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 encapsulation 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.

[0041] The following is in conjunction with the appendix Figure 1-6 This invention describes the battery cell of an embodiment of the present invention.

[0042] The battery cell of this utility model embodiment includes a plurality of first polarity plates 1, a plurality of second polarity plates 2 and a first separator 3. The first separator 3 is folded and stacked sequentially with the plurality of first polarity plates 1 and the plurality of second polarity plates 2, that is, the first separator 3 is spaced between adjacent first polarity plates 1 and second polarity plates 2.

[0043] The first polar electrode 1 is provided with a positioning hole 4, and the second polar electrode 2 has a first side and a second side opposite to each other in its thickness direction. The first side is provided with a positioning protrusion 5 corresponding to the positioning hole 4, and the positioning protrusion 5 of the second polar electrode 2 is embedded in the positioning hole 4 of its adjacent first polar electrode 1.

[0044] Specifically, either the first polarity electrode 1 or the second polarity electrode 2 is a positive electrode, and the other is a negative electrode.

[0045] To address the issue of misalignment between the positive and negative electrodes in battery cells in related technologies, the battery cell of this utility model embodiment is provided with a positioning hole 4 on the first polarity electrode 1 and a positioning protrusion 5 that can be embedded in the positioning hole 4 on the second polarity electrode 2. This can prevent misalignment of the first polarity electrode 1 and the second polarity electrode 2, thereby also preventing wrinkling of the separator and thus preventing lithium plating in the battery cell. This greatly improves the safety performance of the battery cell of this utility model embodiment.

[0046] Therefore, the battery cell of this utility model embodiment can avoid misalignment between the first polarity electrode 1 and the second polarity electrode 2 and wrinkling of the separator, and can also improve the safety performance of the battery cell.

[0047] In some embodiments, a positioning groove 6 corresponding to the positioning protrusion 5 is provided on the second side of the second polarity electrode 2.

[0048] It is understandable that the positioning protrusion 5 and positioning groove 6 on the second polarity electrode 2 can be obtained by stamping process. When the positioning groove 6 is obtained by stamping one side of the polarity electrode tab, the corresponding positioning groove 6 can also be obtained on the other side of the second polarity electrode 2.

[0049] The positioning protrusion 5 of the second polarity plate 2 located on one side of the thickness direction of the first polarity plate 1 passes through the positioning hole 4 of the first polarity plate 1 and is embedded in the positioning groove 6 of the second polarity plate 2 located on the other side of the thickness direction of the first polarity plate 1.

[0050] The positioning hole 4 of the first polarity electrode 1 and the positioning protrusion 5 of the second polarity electrode 2 cooperate to prevent misalignment between the first polarity electrode 1 and the second polarity electrode 2.

[0051] The positioning protrusion 5 of the second positioning electrode on one side of the first polar electrode 1 passes through the positioning hole 4 of the first polar electrode 1 and is embedded in the positioning groove 6 of the second polar electrode 2 on the other side of the first polar electrode 1. This not only prevents misalignment between the first polar electrode 1 and the second polar electrode 2, but also further prevents misalignment between multiple first polar electrodes 1 and multiple second polar electrodes 2.

[0052] Therefore, by providing a positioning groove 6 corresponding to the positioning protrusion 5 on the second polarity electrode 2, the battery cell of this utility model embodiment can further avoid misalignment between multiple first polarity electrodes 1 and multiple second polarity electrodes 2.

[0053] In some embodiments, the first diaphragm 3 is positioned between the positioning protrusion 5, the positioning hole 4, and the positioning groove 6, and is configured with a structure that is raised on one side and recessed on the other side relative to other areas, so as to adapt to the first polar electrode 1 and the second polar electrode 2. It can be understood that the first diaphragm 3 is a flexible thin film material. During assembly, the first diaphragm 3 can be formed by pressing the first polar electrode 1 and the second polar electrode 2, so that a structure with one side raised and the other side recessed can be formed at the position of the first diaphragm 3 corresponding to the positioning protrusion 5, the positioning hole 4, and the positioning groove 6.

[0054] In some embodiments, the first polarity electrode 1 is a positive electrode and the second polarity electrode 2 is a negative electrode.

[0055] The battery cell includes multiple positive electrode plates, multiple negative electrode plates, and a first separator 3. The first separator 3 is folded and stacked sequentially with the multiple positive electrode plates and multiple negative electrode plates.

[0056] The positive electrode sheet has a positioning hole 4, and the negative electrode sheet has a first side and a second side opposite to each other in its thickness direction. The first side has a positioning protrusion 5 corresponding to the positioning hole 4, and the positioning protrusion 5 of the negative electrode sheet is embedded in the positioning hole 4 of its adjacent positive electrode sheet.

[0057] By setting a positioning hole 4 on the positive electrode and a positioning protrusion 5 on the negative electrode that can be embedded in the positioning hole 4, misalignment of the positive and negative electrodes can be avoided, thereby preventing the separator from wrinkling and thus preventing lithium plating in the battery cell. This greatly improves the safety performance of the battery cell in this embodiment of the utility model.

[0058] The second side of the negative electrode sheet is provided with a positioning groove 6 corresponding to the positioning protrusion 5. The positioning protrusion 5 of the negative electrode sheet located on one side in the thickness direction of the positive electrode sheet passes through the positioning hole 4 of the positive electrode sheet and is embedded in the positioning groove 6 of the negative electrode sheet located on the other side in the thickness direction of the positive electrode sheet.

[0059] Furthermore, by setting a positioning groove 6 corresponding to the positioning protrusion 5 on the negative electrode sheet, misalignment between the positive electrode sheet and multiple negative electrode sheets can be further avoided.

[0060] In some embodiments, the first polarity electrode 1 is a negative electrode and the second polarity electrode 2 is a positive electrode.

[0061] The battery cell includes multiple negative electrode plates, multiple positive electrode plates, and a first separator 3. The first separator 3 is folded and stacked sequentially with the multiple negative electrode plates and multiple positive electrode plates.

[0062] The negative electrode sheet is provided with a positioning hole 4, and the positive electrode sheet has a first side and a second side opposite to each other in its thickness direction. The first side is provided with a positioning protrusion 5 corresponding to the positioning hole 4, and the positioning protrusion 5 of the positive electrode sheet is embedded in the positioning hole 4 of its adjacent negative electrode sheet.

[0063] By setting positioning holes 4 on the negative electrode and positioning protrusions 5 on the positive electrode that can be embedded in the positioning holes 4, misalignment of the positive and negative electrode can be avoided, which in turn can prevent the separator from wrinkling and thus prevent lithium plating in the battery cell.

[0064] The second side of the positive electrode plate is provided with a positioning groove 6 corresponding to the positioning protrusion 5.

[0065] The positioning protrusion 5 of the positive electrode sheet located on one side of the negative electrode sheet in the thickness direction passes through the positioning hole 4 of the negative electrode sheet and is embedded in the positioning groove 6 of the positive electrode sheet located on the other side of the negative electrode sheet in the thickness direction.

[0066] Furthermore, by setting a positioning groove 6 corresponding to the positioning protrusion 5 on the positive electrode, misalignment between the positive electrode and multiple negative electrode can be further avoided.

[0067] In some embodiments, there are multiple positioning holes 4, which are spaced apart circumferentially along the first polarity electrode 1.

[0068] Furthermore, the first polarity plate 1 is a polygonal plate, and multiple positioning holes 4 are distributed at the corners of the first polarity plate 1; for example, the first polarity plate 1 is a quadrilateral plate, that is, the first polarity plate is a square plate, and multiple positioning holes 4 are distributed at the corners of the first polarity plate.

[0069] Alternatively, the first polarity electrode 1 is a circular sheet, and multiple positioning holes 4 are spaced apart along the circumference of the first polarity electrode 1.

[0070] Correspondingly, the shape of the second polarity electrode 2 is consistent with the shape of the first polarity electrode 1. Furthermore, the positions of the positioning hole 4, the positioning protrusion 5, and the positioning groove 6 should also be consistent.

[0071] In some embodiments, the number of positioning holes 4 is 2-4, and the diameter of the positioning holes 4 is 2-10mm.

[0072] Preferably, the number of positioning holes 4 is 2, 3 or 4.

[0073] Preferably, the diameter of the positioning hole 4 is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0074] By setting the number of positioning holes 4 to 2-4 and the diameter of positioning holes 4 to 2-10mm, it is possible to prevent misalignment between the first electrode and the second electrode, and avoid the positioning holes 4, positioning protrusions 5 and positioning grooves 6 from affecting the cell density.

[0075] In some embodiments, there are multiple positioning protrusions 5, and each positioning protrusion 5 is provided in a one-to-one correspondence with a positioning hole 4; there are multiple positioning grooves 6, and each positioning groove 6 is provided in a one-to-one correspondence with a positioning protrusion 5.

[0076] The positioning protrusion 5 is a spherical crown-shaped protrusion, and the positioning groove 6 is a spherical crown-shaped groove.

[0077] It is understandable that the positioning protrusion 5 is embedded in the positioning groove 6 after passing through the positioning hole 4. In other words, the dimensions of the positioning protrusion 5 and the positioning groove 6 should be set according to the dimensions of the positioning hole 4. The reference should be that after the positioning protrusion 5 passes through the positioning hole 4 and is embedded in the positioning groove 6, the positioning protrusion 5 will not move relative to the positioning hole 4.

[0078] In some embodiments of the present invention, the battery cell further includes a second diaphragm 7, which is disposed around the battery cell to enclose the battery cell.

[0079] By providing a second diaphragm 7 to wrap the battery cell in this embodiment, the insulation performance of the battery cell in this embodiment can be improved, thereby avoiding the problem of short circuit in the battery cell in this embodiment.

[0080] Furthermore, one end of the second diaphragm 7 is connected to the first diaphragm 3, meaning that the first diaphragm 3 and the second diaphragm 7 are an integral structure.

[0081] The other end of the second diaphragm 7 is connected to the first diaphragm 3 or the second diaphragm 7 via insulating tape 8. In other words...

[0082] When the other end of the second diaphragm 7 is located outside the first diaphragm 3, the other end of the second diaphragm 7 is connected to the first diaphragm 3 through insulating tape 8;

[0083] When the other end of the second diaphragm 7 is located outside the second diaphragm 7, the other end of the second diaphragm 7 is connected to the second diaphragm 7 through insulating tape 8.

[0084] In some embodiments of the present invention, the battery cell is a stacked structure.

[0085] This utility model also provides a battery.

[0086] The battery of this utility model embodiment includes the battery cell as described in the above embodiment.

[0087] By configuring the battery cell of the above embodiment, the battery of this utility model can avoid misalignment between the first polarity electrode 1 and the second polarity electrode 2 and wrinkling of the separator, and can also improve the safety performance of the battery of this utility model embodiment.

[0088] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A battery cell, characterized in that, It includes a first polar electrode (1), a second polar electrode (2), and a first diaphragm (3) located between the first polar electrode (1) and the second polar electrode (2); The first polar electrode (1) is provided with a positioning hole (4), and the second polar electrode (2) has a first side and a second side opposite to each other in its thickness direction. The first side is provided with a positioning protrusion (5) corresponding to the positioning hole (4). The positioning protrusion (5) of the second polar electrode (2) is embedded in the positioning hole (4) of the adjacent first polar electrode (1).

2. The battery cell according to claim 1, characterized in that, The second polarity electrode (2) has a positioning groove (6) on its second side that corresponds to the positioning protrusion (5). The positioning protrusion (5) of the second polar electrode (2) located on one side of the thickness direction of the first polar electrode (1) passes through the positioning hole (4) of the first polar electrode (1) and is embedded in the positioning groove (6) of the second polar electrode (2) located on the other side of the thickness direction of the first polar electrode (1).

3. The battery cell according to claim 2, characterized in that, The first polar electrode (1) is a positive electrode and the second polar electrode (2) is a negative electrode; or, the first polar electrode (1) is a negative electrode and the second polar electrode (2) is a positive electrode.

4. The battery cell according to claim 2, characterized in that, The positioning holes are multiple, and the multiple positioning holes are arranged at intervals along the circumference of the first polarity electrode.

5. The battery cell according to claim 4, characterized in that, The first polarity electrode is a polygonal sheet, and the plurality of positioning holes are distributed at the corners of the first polarity electrode, or The first polarity electrode is a circular sheet, and multiple positioning holes are spaced apart along the circumference of the first polarity electrode.

6. The battery cell according to claim 5, characterized in that, The number of positioning holes is 2-4, and the diameter of the positioning holes is 2-10mm.

7. The battery cell according to claim 5 or 6, characterized in that, There are multiple positioning protrusions, and each of the multiple positioning protrusions is configured to correspond one-to-one with the positioning hole; there are multiple positioning grooves, and each of the multiple positioning grooves is configured to correspond one-to-one with the positioning protrusion. The positioning protrusion is a spherical crown-shaped protrusion, and the positioning groove is a spherical crown-shaped groove.

8. The battery cell according to claim 1, characterized in that, It also includes a second diaphragm (7), which is arranged around the cell to wrap the cell. One end of the second diaphragm (7) is connected to the first diaphragm (3), and the other end of the second diaphragm (7) is connected to the first diaphragm (3) or the second diaphragm (7) through insulating tape (8).

9. The battery cell according to claim 1, characterized in that, The battery cell has a stacked structure.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-9.

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