Battery cell structure and battery

Abstract

The utility model provides a battery cell structure and a battery. The battery cell structure comprises at least one first pole piece and at least one second pole piece, the at least two second pole pieces are arranged at intervals in the first direction, and the first pole pieces and the second pole pieces are sequentially arranged in a stacked mode; the diaphragm comprises a plurality of partition sub-parts, and the multiple partition sub-parts are sequentially arranged in the first direction; a partition sub-part is arranged between each first pole piece and the corresponding second pole piece; wherein any end of the battery cell structure along the first direction is a second pole piece, and the second pole piece positioned at the end part is provided with a first notch area; and in the first direction, every two adjacent partition sub-parts are attached to each other to form an attaching area, and the projection of the attaching area in the first direction and the projection of the first notch area in the first direction are at least partially overlapped. The battery cell structure provided by the utility model solves the problem that the yield of the battery cell structure in the prior art is easily influenced due to turnover of the diaphragm.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery core structure and a battery. Background Art

[0002] There are two main types of lithium-ion battery cells: winding structure and stacking structure. Compared with the winding structure, the stacking structure has the advantages of lower internal resistance, higher utilization, larger electrode area, and higher energy density. It can also be customized in shape, size, and thickness, making it easy to make special-shaped batteries. With the increasing market demand for special-shaped lithium batteries and the improvement of stacking technology, stacking structure lithium batteries have developed rapidly.

[0003] The laminated battery cell is usually wrapped with a diaphragm, that is, the outermost electrode is covered by the diaphragm. The diaphragm itself is thin and soft, and static electricity is easily generated during the production process. During the preparation and movement of the laminated battery cell, the diaphragm is prone to folding, exposing the electrode, causing the battery cell structure to leak black. At this time, the electrode will be in direct contact with the packaging material, which has the risk of short circuit, reduced safety performance, and reduced process yield.

[0004] Therefore, there is a problem in the related art that the cell structure is easily affected by the folding of the diaphragm, which affects the yield rate. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery cell structure and a battery, so as to solve the problem in the related art that the battery cell structure is easily affected by the folding of the diaphragm, which affects the yield rate.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cell structure is provided, including: at least one first pole piece; at least two second pole pieces, at least two second pole pieces are arranged at intervals along the first direction, and the first pole piece and the second pole piece are stacked in sequence; a diaphragm, the diaphragm includes a plurality of partitioning sub-sections, and the plurality of partitioning sub-sections are arranged in sequence along the first direction; a partitioning sub-section is arranged between the first pole piece and the second pole piece; wherein, there is a second pole piece at either end of the battery cell structure along the first direction, and the second pole piece located at the end has a first notch area; along the first direction, two adjacent partitioning sub-sections are bonded to each other to form a bonding area, and the projection of the bonding area in the first direction at least partially overlaps with the projection of the first notch area in the first direction.

[0007] Further, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, and along the first direction, the outer side of the second pole piece located at the end is a current collector or an active material coating; or, the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, and along the first direction, the outer side of the second pole piece located at the end is a current collector; wherein the outer side of the second pole piece is the side of the second pole piece away from the first pole piece adjacent to it.

[0008] Furthermore, the multiple partition sub-sections are of split structure, or the multiple partition sub-sections are connected as a whole, and the diaphragm is folded to form the multiple partition sub-sections.

[0009] Furthermore, the first notch area is a cut corner or a cut edge arranged on the second pole piece, there are one or more first notch areas, and the cut corner or the cut edge is arranged at the edge of the second pole piece.

[0010] Further, along the first direction, a second notch area is provided on the first pole piece adjacent to the second pole piece at the end, and a projection of the second notch area in the first direction at least partially overlaps with a projection of the first notch area in the first direction.

[0011] Further, when the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, the projection of the second notch area in the first direction covers the projection of the first notch area in the first direction; when the first pole piece is a negative pole piece and the second pole piece is a positive pole piece, the projection of the first notch area in the first direction covers the projection of the second notch area in the first direction.

[0012] Further, the second electrode is a negative electrode, and the first electrode is a positive electrode; wherein, along the second direction, the maximum length of the first notch area is a, and along the second direction, the maximum length of the second notch area is b, wherein a<b; and / or, along the third direction, the maximum length of the first notch area is c, and along the third direction, the maximum length of the second notch area is d, wherein c<d; the first direction, the second direction and the third direction are perpendicular to each other.

[0013] Further, the second pole ear of the battery cell structure is arranged at the first end of the second pole piece along the third direction, and the first pole ear of the battery cell structure is arranged at the first end or the second end of the first pole piece along the third direction, wherein the first end and the second end are opposite ends; along the second direction, the distance between the second pole ear and the first edge is e, a<e, wherein the first edge is the edge of the second pole piece along the second direction; and / or, along the second direction, the distance between the first pole ear and the second edge is h, b<h, wherein the second edge is the edge of the first pole piece along the second direction.

[0014] Furthermore, the battery cell structure also includes a first adhesive sticker, which is arranged at the end of the main body of the battery cell structure along the third direction, and the first adhesive sticker is used to adhere and fix the first pole piece, the second pole piece and the diaphragm.

[0015] Further, along the second direction, the distance between the first adhesive tape closest to the second edge and the second edge is f, wherein b≤f.

[0016] Furthermore, the battery cell structure also includes a second adhesive sticker, which is arranged at the end of the main body of the battery cell structure along the second direction, and the second adhesive sticker is used to adhere and fix the first pole piece, the second pole piece and the diaphragm.

[0017] Further, along the third direction, the distance between the second adhesive tape closest to the side edge and the side edge is g, wherein d≤g, the side edge is the edge of the first pole piece along the third direction, and the second notch area is arranged at the side edge.

[0018] Furthermore, the first notch area and / or the second notch area is a cut corner, wherein the shape of the cutting edge of the cut corner is at least one of the following: a straight line, an arc line, and a broken line.

[0019] According to another aspect of the utility model, a battery is provided, the battery comprising a shell and a battery cell structure arranged in the shell, and the battery cell structure is the above-mentioned battery cell structure.

[0020] A battery cell structure using the technical solution of the utility model comprises: at least one first pole piece; at least two second pole pieces, which are spaced apart along a first direction, and the first pole piece and the second pole piece are stacked in sequence; a diaphragm, which comprises a plurality of partitioning sub-sections, which are arranged in sequence along the first direction; a partitioning sub-section is arranged between the first pole piece and the second pole piece; wherein, at either end of the battery cell structure along the first direction is a second pole piece, and the second pole piece at the end has a first notch area; along the first direction, two adjacent partitioning sub-sections are bonded to each other to form a bonding area, and the projection of the bonding area in the first direction at least partially overlaps with the projection of the first notch area in the first direction. With the battery cell structure adopting this structural design, since the first notch area is designed on the outermost second pole piece, the contact area between the outermost partition sub-portion and the second outermost partition sub-portion will increase, and the parts of the two located at the first notch area will fit together, thereby making the fit between the two more secure, reducing the risk of the outermost diaphragm of the battery cell structure folding and thus black leakage, which is beneficial to ensuring the quality of the battery cell structure and solving the problem in the related art that the battery cell structure is easily affected by the folding of the diaphragm and the yield rate is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the first embodiment of the battery cell structure of the utility model during assembly;

[0023] Figure 2 It is a schematic diagram of the second pole piece of the first embodiment of the battery cell structure of the utility model before and after the first notch area is provided;

[0024] Figure 3It is a schematic diagram of the first pole piece of the first embodiment of the battery cell structure of the utility model before and after the second notch area is provided;

[0025] Figure 4 It is a structural schematic diagram of the first embodiment of the battery core structure of the utility model;

[0026] Figure 5 It is a schematic diagram of the second embodiment of the battery core structure of the utility model during assembly;

[0027] Figure 6 It is a schematic diagram of the second pole piece of the second embodiment of the battery core structure of the utility model before and after the first notch area is provided;

[0028] Figure 7 It is a schematic diagram of the first pole piece of the second embodiment of the battery core structure of the utility model before and after the second notch area is provided;

[0029] Figure 8 It is a structural schematic diagram of a second embodiment of the battery core structure of the utility model;

[0030] Fig. 9 This is a schematic diagram of optional shapes of the first notch area of ​​the second pole piece of an embodiment of the battery core structure of the utility model.

[0031] The above drawings include the following reference numerals:

[0032] 1. First pole piece; 11. Second notch area; 12. First pole ear; 2. Second pole piece; 21. First notch area; 22. Second pole ear; 3. Diaphragm; 31. Separating sub-portion; 41. First adhesive label; 42. Second adhesive label. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Please refer to Figures 1 to 9An embodiment of the utility model provides a battery cell structure, which includes: at least one first pole piece 1; at least two second pole pieces 2, at least two second pole pieces 2 are arranged at intervals along the first direction, and the first pole piece 1 and the second pole piece 2 are stacked in sequence; a diaphragm 3, the diaphragm 3 includes a plurality of partitioning sub-portions 31, and the plurality of partitioning sub-portions 31 are arranged in sequence along the first direction; a partitioning sub-portion 31 is arranged between the first pole piece 1 and the second pole piece 2; wherein, there is a second pole piece 2 at either end of the battery cell structure along the first direction, and the second pole piece 2 located at the end has a first notch area 21; along the first direction, two adjacent partitioning sub-portions 31 are bonded to each other to form a bonding area, and the projection of the bonding area in the first direction at least partially overlaps with the projection of the first notch area 21 in the first direction. With a cell structure adopting this structural design, since the first notch area 21 is designed on the outermost second pole piece, the contact area between the outermost partition sub-portion 31 and the second outermost partition sub-portion 31 will increase, and the portions of the two located at the first notch area 21 will fit together, thereby making the fit between the two more secure, reducing the risk of the outermost diaphragm of the cell structure folding and thus black leakage, which is beneficial to ensuring the quality of the cell structure and solving the problem in the related art that the cell structure is easily affected by the folding of the diaphragm and the yield rate is affected.

[0035] In a specific embodiment, the first pole piece 1 and the second pole piece 2 are arranged alternately, and for any first pole piece 1, there is a second pole piece 2 on both sides along the first direction; the diaphragm 3 includes a plurality of partition sub-portions 31, and the plurality of partition sub-portions 31 are arranged in sequence along the first direction, and for any first pole piece 1 or any second pole piece, they are all located between two partition sub-portions 31.

[0036] In a specific embodiment, during the production of the battery cell structure, a hot pressing process is used to firmly bond the diaphragm 3 to the first pole piece 1 and the second pole piece 2. During the hot pressing process, the outermost partition sub-portion 31 and the second outermost partition sub-portion 31 and the portion corresponding to the first notch area 21 will fit more fully together, so that the outermost partition sub-portion 31 is more firmly fixed, thereby preventing the outermost partition sub-portion 31 from folding.

[0037] In a specific implementation, the first electrode sheet 1 can be a positive electrode sheet or a negative electrode sheet, and correspondingly, the second electrode sheet 2 can be a negative electrode sheet or a positive electrode sheet.

[0038] In an optional embodiment, the first pole piece 1 is a positive pole piece, the second pole piece 2 is a negative pole piece, and along the first direction, the outer side of the second pole piece 2 located at the end is a current collector or an active material coating.

[0039] In another optional embodiment, the first pole piece 1 is a negative pole piece, the second pole piece 2 is a positive pole piece, and along the first direction, the outer side of the second pole piece 2 located at the end is a current collector; wherein, the outer side of the second pole piece 2 is the side of the second pole piece 2 away from the first pole piece 1 adjacent to it.

[0040] When the second electrode sheet 2 is a negative electrode sheet, the outermost side of the second electrode sheet 2 at the end may be coated with an active material coating, or may not have a coating but be a current collector. When the second electrode sheet 2 is a positive electrode sheet, the outermost side of the second electrode sheet 2 at the end is not provided with an active material coating but is a current collector, so that the area of ​​the corresponding negative electrode sheet can be ensured to be larger than that of the positive electrode sheet, thereby avoiding the occurrence of lithium deposition.

[0041] In actual implementation, the diaphragm 3 may also have different structural forms:

[0042] For example, in an optional solution, the plurality of partition sub-sections 31 are split structures. That is, the plurality of partition sub-sections 31 are independent of each other, that is, a plurality of independently arranged partition sub-sections 31 are arranged layer by layer in sequence along the first direction to form the diaphragm 3 together.

[0043] For another example, in another optional solution, multiple partition sub-sections 31 are connected as one body, and the diaphragm 3 is folded to form multiple partition sub-sections 31. In this case, the diaphragm 3 is a whole body, and the diaphragm 3 can be folded into multiple parts by folding it in a circuitous manner, and the multiple parts are correspondingly used as multiple partition sub-sections 31.

[0044] In a specific embodiment, the plurality of partition sub-parts 31 are a whole, which is formed by folding the diaphragm 3. At this time, the diaphragm 3 is unfolded to be in the shape of a long strip, and the first notch area 21 is arranged at a position of the second pole piece 2 corresponding to the end of the diaphragm 3. The so-called end of the diaphragm 3 is an end along the length direction of the strip.

[0045] In this embodiment, the first notch area 21 is arranged at a position of the second pole piece 2 corresponding to the end of the diaphragm 3. In actual process, the folding of the diaphragm 3 usually occurs at the end of the diaphragm 3. By setting the first notch area 21 at a position of the second pole piece 2 corresponding to the end of the diaphragm 3, the end of the diaphragm 3 can be better fitted with the sub-outer layer partition sub-portion 31, thereby avoiding the folding of the end of the diaphragm 3 and black leakage, thereby ensuring the quality of the battery cell structure.

[0046] In specific implementation, the first notch area 21 can be set at any position on the edge of the second pole piece 2, and its shape can also be selected in any shape according to actual conditions, which can provide more sufficient fitting space for the edge portion of the outermost separator sub-section 31 and the second outermost separator sub-section 31, so that the edge portion of the outermost separator sub-section 31 is more firmly fixed, reducing the risk of its flanging. It plays a role in reducing the risk of flanging of the outermost separator sub-section 31.

[0047] Specifically, in some optional embodiments, the first notch area 21 is a cut corner or a cut edge provided on the second pole piece 2, and there are one or more first notch areas 21, and the first notch area 21 is provided at the edge of the second pole piece 2. The cut corner is a notch provided at the corner of the second pole piece 2. At this time, the second pole piece 2 has adjacent edges, and the adjacent edges intersect to form an angle, and the cut corner is provided at the position of the corner. The cut edge is a notch provided at the side position of the second pole piece 2, which can be a complete cut off of one or more side edges of the second pole piece 2, or a part of the side edge of the second pole piece 2. In specific implementation, according to actual needs, the cut edge can be provided on any one or more sides of the second pole piece 2, and the cut corner can also be provided at any one or more corners of the second pole piece 2. That is, the setting position of the first notch area 21 has great flexibility. For example, when there is one first notch area 21, it can be located at any edge or corner; when there are two first notch areas 21, they can be located at adjacent or opposite edges or corners; when there are three or more first notch areas 21, any two first notch areas 21 can be located at adjacent or opposite edges or corners.

[0048] As described above, since the first notch area 21 is designed on the outermost second pole piece 2, the outermost partition sub-portion 31 can be more fully fitted with the second outermost partition sub-portion 31, thereby reducing the risk of folding of the outer diaphragm 3. In actual implementation, the shape and position of the first notch area 21 can be selected in a variety of ways, as long as the contact area between the outermost partition sub-portion 31 and the second outermost partition sub-portion 31 can be increased, the above-mentioned effect of preventing the diaphragm from folding can be achieved.

[0049] In a preferred embodiment, the first notch region 21 is a cut corner provided on the second pole piece 2, such as Figures 1 to 8As shown, the edge corners of the second pole piece 2 corresponding to the ends of the diaphragm 3 are designed with cut corners. In actual implementation, the cut corners can be one or more, and can be set according to the actual needs of preventing the diaphragm from folding. For example, if the diaphragm is composed of a plurality of separately arranged partition sub-sections 31, then any corner of the outermost diaphragm 3 may be folded. In this case, cut corners can be set at the four corners of the second pole piece 2 located at the end. Since the diaphragm 3 mostly folds at the corners, by designing the first notch area 21 as a cut corner structure, the corners of the outermost partition sub-section 31 can be more fully fitted with the corners of the second outermost partition sub-section 31, thereby avoiding the risk of folding of the diaphragm 3. In actual implementation, the shape of the cut corner can also be varied, and it can be a regularly shaped cut corner or an irregularly shaped cut corner, such as Fig. 9 As shown. The first notch area 21 and / or the second notch area 11 are cut corners, wherein the shape of the cutting edge of the cut corner is at least one of the following: a straight line, an arc line, and a broken line. The cutting edge can be a flat edge, a protruding edge, or a concave edge. In some other optional embodiments, the shape of the cutting edge can be an irregular shape.

[0050] Specifically, along the first direction, a second notch area 11 is provided on the first pole piece 1 adjacent to the second pole piece 2 at the end, and the projection of the second notch area 11 in the first direction at least partially overlaps with the projection of the first notch area 21 in the first direction, that is, the position of the second notch area 11 corresponds to the position of the first notch area 21, and the two can be in a completely overlapping relationship, a partially overlapping relationship, or an overlapping relationship.

[0051] As mentioned above, a first notch area 21 is designed on the outermost second pole piece 2. On this basis, the size of the first pole piece 1 adjacent thereto will be larger. In this embodiment, a second notch area 11 is designed on the first pole piece 1 adjacent to the second pole piece 2 at the end, and the position of the second notch area 11 corresponds to the position of the first notch area 21, so that the correspondence between the first pole piece 1 and the second pole piece 2 is better, which is beneficial to ensure the energy density of the battery cell structure, avoid lithium plating caused by too many positive pole pieces, and ensure the working reliability of the battery cell structure.

[0052] Specifically, when the first pole piece 1 is a positive pole piece and the second pole piece 2 is a negative pole piece, the projection of the second notch area 11 in the first direction covers the projection of the first notch area 21 in the first direction; when the first pole piece 1 is a negative pole piece and the second pole piece 2 is a positive pole piece, the projection of the first notch area 21 in the first direction covers the projection of the second notch area 11 in the first direction, and the area of ​​the second notch area 11 is greater than the area of ​​the first notch area 21.

[0053] By designing the size of the second notch area 11 and the size of the first notch area 21, it can be ensured that the area of ​​the negative electrode sheet is always larger than the area of ​​the positive electrode sheet, so that the negative electrode sheet completely covers the positive electrode sheet, better avoiding the occurrence of lithium deposition problems on the negative electrode, reducing the risk of battery cell short circuit, and improving the working reliability of the battery cell structure.

[0054] Specifically, the second electrode 2 is a negative electrode, and the first electrode 1 is a positive electrode; along the second direction, the maximum length of the first notch area 21 is a, and along the second direction, the maximum length of the second notch area 11 is b, where a<b; along the third direction, the maximum length of the first notch area 21 is c, and along the third direction, the maximum length of the second notch area 11 is d, where c<d; the first direction, the second direction, and the third direction are perpendicular to each other. Figures 1 to 8 As shown, in the embodiment of the present application, the first direction is the stacking direction of the first pole piece 1, the second pole piece 2 and the diaphragm 3, and there are two directions perpendicular to the first direction, which are defined as the second direction and the third direction. In the embodiment of the present application, the first pole piece 1 and the second pole piece 2 adopt a rectangular structure, so the second direction and the third direction are respectively consistent with the length and width directions of the rectangular structure. For example Figure 2 and Figure 3 As shown, or for example Figure 6 and Figure 7 As shown, in this part of the embodiments, the first notch area 21 can be a first cut angle set on the second pole piece 2, and the second notch area 11 can be a second cut angle set on the first pole piece 1. The sizes of the first cut angle and the second cut angle meet the above-mentioned requirements of a<b, c<d, thereby ensuring that the area of ​​the negative electrode sheet is larger than that of the positive electrode sheet to avoid lithium plating at the negative electrode.

[0055] Specifically, Figure 2 and Figure 3 As shown, the second pole ear 22 of the battery cell structure is arranged at the first end of the second pole piece 2 along the third direction, and the first pole ear 12 of the battery cell structure is arranged at the first end or the second end of the first pole piece 1 along the third direction, wherein the first end and the second end are opposite ends; along the second direction, the distance between the second pole ear 22 and the first edge is e, a<e, wherein the first edge is the edge of the second pole piece 2 along the second direction; and / or, along the second direction, the distance between the first pole ear 12 and the second edge is h, b<h, wherein the second edge is the edge of the first pole piece 1 along the second direction.

[0056] That is to say, in actual implementation, along the third direction, the second pole tab 22 of the second pole piece 2 and the first pole tab 12 of the first pole piece 1 can be located at the same end or at different ends.

[0057] like Figures 1 to 4As shown, in an optional embodiment, both are located at the same end, that is, the second pole tab 22 is located at the first end of the second pole piece 2 along the third direction, and the first pole tab 12 is located at the first end of the first pole piece 1 along the third direction.

[0058] like Figures 5 to 8 As shown, in another optional embodiment, the two are located at different ends, that is, the second pole lug 22 is located at the first end of the second pole piece 2 along the third direction, and the first pole lug 12 is located at the second end of the first pole piece 1 along the third direction.

[0059] In both cases, the size relationship of the notch area also needs to take into account the positional relationship with the first pole tab 12 and the second pole tab 22 to avoid interference.

[0060] like Figures 1 to 4 As shown, in one embodiment, the first pole ear 12 of the battery cell structure is arranged at the first end of the first pole piece 1, and the distance between it and the second edge is h, b<h, so that the first pole ear 12 will not interfere with the second notch area 11. The second pole ear 22 of the battery cell structure is arranged at the first end of the second pole piece 2, and the distance between it and the first edge is e, wherein a<e, so that the second pole ear will not interfere with the first notch area 21. In this embodiment, h>e, that is, the second pole ear 22 is closer to the edge where the first notch area 21 or the second notch area 11 is located. On this basis, in order to ensure that the notch area and the pole ear do not interfere with each other, the preferred setting method is b<e.

[0061] like Figures 5 to 8 As shown, in another embodiment, the first pole ear 12 of the battery cell structure is arranged at the second end of the first pole sheet 1, and the distance between the first pole ear 12 and the second edge is h, b<h, so that the first pole ear 12 will not interfere with the second notch area 11. The second pole ear 22 of the battery cell structure is arranged at the first end of the second pole sheet 2, and the distance between the first edge is e, wherein a<e, so that the second pole ear will not interfere with the first notch area 21.

[0062] The cell structure also includes a first adhesive sticker 41, which is arranged at the end of the main part of the cell structure along the third direction, and the first adhesive sticker 41 is used to adhere and fix the first pole piece 1, the second pole piece 2 and the diaphragm 3; along the second direction, the distance between the first adhesive sticker 41 closest to the second edge and the corner edge is f, where b≤f. The cell structure also includes a second adhesive sticker 42, which is arranged at the end of the main part of the cell structure along the second direction, and the second adhesive sticker 42 is used to adhere and fix the first pole piece 1, the second pole piece 2 and the diaphragm 3; the distance between the second adhesive sticker 42 closest to the side edge and the side edge is g, where d≤g, the side edge is the edge of the second pole piece 2 or the first pole piece 1 along the third direction, and the second notch area 11 is arranged at the side edge. Among them, the main part of the cell structure mentioned above, that is, the part of the cell structure other than the first adhesive sticker 41 and the second adhesive sticker 42, includes the first pole piece 1, the second pole piece 2 and the diaphragm 3 mentioned above.

[0063] As mentioned above, the size relationship needs to be designed according to the distance between the first pole tab 12 and the second pole tab 22 and the edge of the pole piece where the corresponding notch area is located, so as to avoid interference between the notch area and the pole tab. Similarly, when the battery cell structure includes the first adhesive sticker 41 and / or the second adhesive sticker 42, the above-mentioned size design also needs to take into account the interference with the first adhesive sticker 41 and / or the second adhesive sticker 42.

[0064] According to another aspect of the utility model, a battery is provided, the battery comprising a shell and a battery cell structure arranged in the shell, and the battery cell structure is the above-mentioned battery cell structure.

[0065] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0066] The battery cell structure of an embodiment of the utility model includes: at least one first pole piece 1; at least two second pole pieces 2, at least two second pole pieces 2 are arranged at intervals along the first direction, and the first pole piece 1 and the second pole piece 2 are stacked in sequence; a diaphragm 3, the diaphragm 3 includes a plurality of partitioning sub-portions 31, and the plurality of partitioning sub-portions 31 are arranged in sequence along the first direction; a partitioning sub-portion 31 is arranged between the first pole piece 1 and the second pole piece 2; wherein, there is a second pole piece 2 at either end of the battery cell structure along the first direction, and the second pole piece 2 located at the end has a first notch area 21; along the first direction, two adjacent partitioning sub-portions 31 are bonded to each other to form a bonding area, and the projection of the bonding area in the first direction at least partially overlaps with the projection of the first notch area 21 in the first direction. With a cell structure adopting this structural design, since the first notch area 21 is designed on the outermost second pole piece, the contact area between the outermost partition sub-portion 31 and the second outermost partition sub-portion 31 will increase, and the portions of the two located at the first notch area 21 will fit together, thereby making the fit between the two more secure, reducing the risk of the outermost diaphragm of the cell structure folding and thus black leakage, which is beneficial to ensuring the quality of the cell structure and solving the problem in the related art that the cell structure is easily affected by the folding of the diaphragm and the yield rate is affected.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery cell structure, characterized in that: include: At least one first pole piece (1); At least two second pole pieces (2), wherein the at least two second pole pieces (2) are arranged at intervals along a first direction, and the first pole piece (1) and the second pole piece (2) are arranged in a stacked manner in sequence; A diaphragm (3), the diaphragm (3) comprising a plurality of partition sub-portions (31), the plurality of partition sub-portions (31) being arranged in sequence along the first direction; the partition sub-portions (31) are each arranged between the first pole piece (1) and the second pole piece (2); Wherein, each end of the cell structure along the first direction is a second pole piece (2), and the second pole piece (2) located at the end has a first notch area (21); along the first direction, two adjacent partition sub-parts (31) are bonded to each other to form a bonding area, and the projection of the bonding area in the first direction at least partially overlaps with the projection of the first notch area (21) in the first direction.

2. The battery cell structure according to claim 1, characterized in that: The first pole piece (1) is a positive pole piece, the second pole piece (2) is a negative pole piece, and along the first direction, the outer side of the second pole piece (2) located at the end is a current collector or an active material coating; or, The first pole piece (1) is a negative pole piece, the second pole piece (2) is a positive pole piece, and along the first direction, the outer side of the second pole piece (2) located at the end is a current collector; The outer side of the second pole piece (2) is a side of the second pole piece (2) away from the first pole piece (1) adjacent thereto.

3. The battery cell structure according to claim 1, characterized in that: The plurality of partition sub-sections (31) are of split structure, or, The plurality of partition sub-portions (31) are connected as a whole, and the diaphragm (3) is folded to form the plurality of partition sub-portions (31).

4. The battery cell structure according to claim 1, characterized in that: The first notch area (21) is a cut corner or a cut edge arranged on the second pole piece (2), there are one or more first notch areas (21), and the cut corner or the cut edge is arranged at the edge of the second pole piece (2).

5. The battery core structure according to any one of claims 1 to 4, characterized in that: A second notch area (11) is provided on the first pole piece (1) adjacent to the second pole piece (2) at the end along the first direction, and a projection of the second notch area (11) in the first direction at least partially overlaps with a projection of the first notch area (21) in the first direction.

6. The battery cell structure according to claim 5, characterized in that: When the first pole piece (1) is a positive pole piece and the second pole piece (2) is a negative pole piece, the projection of the second notch area (11) in the first direction covers the projection of the first notch area (21) in the first direction; When the first pole piece (1) is a negative pole piece and the second pole piece (2) is a positive pole piece, the projection of the first notch area (21) in the first direction covers the projection of the second notch area (11) in the first direction.

7. The battery cell structure according to claim 5, characterized in that: The second pole piece (2) is a negative pole piece, and the first pole piece (1) is a positive pole piece; Wherein, along the second direction, the maximum length of the first notch area (21) is a, and along the second direction, the maximum length of the second notch area (11) is b, a<b; and / or, along the third direction, the maximum length of the first notch area (21) is c, and along the third direction, the maximum length of the second notch area (11) is d, c<d; The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery cell structure according to claim 7, characterized in that: The second pole lug (22) of the battery cell structure is arranged at the first end of the second pole piece (2) along the third direction, and the first pole lug (12) of the battery cell structure is arranged at the first end or the second end of the first pole piece (1) along the third direction, wherein the first end and the second end are opposite ends; Along the second direction, the distance between the second pole ear (22) and the first edge is e, a<e, wherein the first edge is the edge of the second pole piece (2) along the second direction; and / or, Along the second direction, the distance between the first pole lug (12) and the second edge is h, b<h, wherein the second edge is the edge of the first pole piece (1) along the second direction.

9. The battery cell structure according to claim 8, characterized in that: The battery cell structure further comprises a first adhesive sticker (41), the first adhesive sticker (41) being arranged at the end of the main body of the battery cell structure along the third direction, and the first adhesive sticker (41) is used to adhere and fix the first pole piece (1), the second pole piece (2) and the diaphragm (3).

10. The battery core structure according to claim 9, characterized in that: Along the second direction, the distance between the first adhesive tape (41) closest to the second edge and the second edge is f, where b≤f.

11. The battery core structure according to claim 8, characterized in that: The battery cell structure further comprises a second adhesive sticker (42), the second adhesive sticker (42) being arranged at the end of the main body of the battery cell structure along the second direction, and the second adhesive sticker (42) is used to adhere and fix the first pole piece (1), the second pole piece (2) and the diaphragm (3).

12. The battery core structure according to claim 11, characterized in that: Along the third direction, the distance between the second adhesive tape (42) closest to the side edge and the side edge is g, wherein d≤g; the side edge is the edge of the first pole piece (1) along the third direction; and the second notch area (11) is arranged at the side edge.

13. The battery core structure according to claim 5, characterized in that: The first notch region (21) and / or the second notch region (11) are cut corners, wherein: The shape of the cutting edge of the chamfer is at least one of the following: a straight line, an arc line, and a broken line.

14. A battery, characterized in that: The battery comprises a shell and a battery cell structure arranged in the shell, and the battery cell structure is the battery cell structure according to any one of claims 1 to 13.

Images