Battery cell, battery apparatus and electric device

Abstract

A battery cell (100), comprising: an electrode core (2) having a plurality of electrode sheets (21). Two ends of each electrode sheet (21) are respectively provided with a tab (22) and a slit edge (23); the plurality of electrode sheets (21) are divided into first electrode sheets (211) and second electrode sheets (212) having opposite polarities; and the tabs (22) having opposite polarities are located on different sides of the electrode core (2). The tabs (22) located on the same side are electrically connected to a first connecting surface (31) of a connecting member (3) by means of a transition sheet (6), the distance between the first connecting surface (31) and the slit edges (23) is L, the number of electrode sheets (21) having the same polarity is n, the number of bending layers in each tab (22) is m and the tab (22) has a thickness of t, the number of bending layers in the transition sheet (6) is m1 and the transition sheet (6) has an overall thickness of t1, and the battery cell (100) has a thickness of T and satisfies: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t+m1*t1)≤15.

Description

Battery cells, battery devices and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 2023111355270 and application date of August 31, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0004] Of all energy sources, electricity is the easiest to use, cleanest, most environmentally friendly, and most efficient. Batteries are the best devices for storing electrical energy. They are widely used in people's daily lives and have a significant impact on people's lives. With the gradual development of battery technology, batteries with good performance are increasingly sought after. In the existing technology, the battery's pole pieces are usually connected to the internal lead sheet and the pole through the tabs, allowing the battery to supply power to the outside. The bending state of the tabs will directly affect the quality of the battery. If the bending space of the battery tabs is unreasonable, it will lead to poor overall battery quality, and there is room for improvement.

[0005] Application Contents

[0006] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, one purpose of this application is to propose a battery cell that is easy to install and can ensure that the pole ear is in good condition after bending, so as to avoid the pole ear root squeezing the cutting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery cell.

[0008] According to an embodiment of the present application, a battery cell includes: a shell assembly; a pole core, the pole core is arranged in the shell assembly, the pole core includes a plurality of pole pieces, each of the pole pieces is provided with a pole ear and a cutting edge at both ends, the plurality of pole pieces are divided into a first pole piece and a second pole piece with opposite polarities, the first pole piece and the second pole piece are arranged in sequence, the pole ear of the first pole piece and the pole ear of the second pole piece are located on different sides of the pole core; the pole ears located on the same side are electrically connected to the first connecting surface of the connector through a transition piece, on the same side of the pole core, the spacing between the first connecting surface and the cutting edge is L, the number of the pole pieces with the same polarity is n, the number of bending layers of the pole ear is m, the number of bending layers of the transition piece is m1, the overall thickness of the transition piece is t1, the thickness of the battery cell is T, the thickness of the pole piece is t, and the battery cell satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / ≤15.

[0009] According to the battery cell of the embodiment of the present application, by arranging the pole ear to be connected to the connecting piece through the transition piece, the difficulty of installing the battery cell can be reduced, and by limiting the spacing between the first connecting surface and the cutting edge on the same side to the above-mentioned range, it can be ensured that the pole ear is in a good state after bending, so as to avoid the pole ear root squeezing the cutting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery cell, and also ensuring the space utilization of the battery cell and improving the quality of the battery cell.

[0010] According to the battery cells of some embodiments of the present application, the number m of the bending layers of the tab is 1≤m≤3; and / or the number m1 of the bending layers of the transition sheet is 1≤m1≤3.

[0011] According to the battery cells of some embodiments of the present application, the length H of the battery cells is 400 mm ≤ H ≤ 1500 mm.

[0012] According to the battery cells of some embodiments of the present application, the width W of the battery cells is set to 80 mm ≤ W ≤ 240 mm.

[0013] According to the battery cells of some embodiments of the present application, the thickness T of the battery cells is set to 10 mm ≤ T ≤ 40 mm.

[0014] According to the battery cells of some embodiments of the present application, in the length direction of the pole core, the pole tabs of the pole pieces with opposite polarities are located on both sides of the pole core.

[0015] According to the battery cell of some embodiments of the present application, the pole core includes two first surfaces arranged opposite to each other, and the area of ​​the first surfaces is larger than the area of ​​the remaining surfaces of the pole core; the battery cell also includes two insulating films, and the two insulating films are respectively attached to the two first surfaces.

[0016] According to the battery cells of some embodiments of the present application, in the width direction of the pole core, the side edges of the two insulating films on the same side are overlapped and connected to insulate and separate the pole core from the shell assembly.

[0017] According to the battery cells of some embodiments of the present application, in the width direction of the pole core, the pole core is provided with a second surface opposite to the pole core, the second surface is provided with an adhesive, and the adhesive has an overlapping area with each of the insulating films.

[0018] According to the battery cells of some embodiments of the present application, the width of the pole core is set to W, and the thickness of the pole core is set to T; in a direction parallel to the width of the pole core, the width of the insulating film is set to W2, satisfying: W+T≤W2≤W+2T.

[0019] According to the battery cells of some embodiments of the present application, the shell assembly includes a shell body and a cover plate. In the length direction of the pole core, the cover plates are provided at both ends of the shell body to define a receiving cavity for placing the pole core, and each cover plate is provided with a pole column.

[0020] According to some embodiments of the present application, the battery cell further includes: a spacer, which is located between the inner side of the cover plate and the end of the pole core, and the spacer includes a support portion that stops at the pole core, and support portions are provided on both sides of the pole ear in the width direction of the pole core.

[0021] According to the battery cells of some embodiments of the present application, in a direction parallel to the width of the pole core, the width of the pole core is set to W, and the support width of the support portion is set to L4, satisfying: L4≤1 / 3W.

[0022] The present application also provides a battery device.

[0023] A battery device according to an embodiment of the present application includes: a housing; and a plurality of battery cells, wherein the battery cells are the battery cells according to any of the above embodiments, and the plurality of battery cells are disposed in the housing.

[0024] According to the battery device of the embodiment of the present application, by arranging the pole ear to be connected to the connecting piece through the transition piece, the difficulty of installing the battery cell can be reduced, and by limiting the distance between the first connecting surface and the cutting edge on the same side to the above-mentioned range, it can be ensured that the pole ear is in a good state after bending, so as to avoid the pole ear root squeezing the cutting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery cell, ensuring the space utilization of the battery cell, improving the quality of the battery cell, and improving the reliability of the battery device.

[0025] The present application further proposes an electrical device.

[0026] An electrical device according to an embodiment of the present application includes the battery device according to any of the above embodiments.

[0027] According to the electrical equipment of the embodiment of the present application, by providing the pole ear to be connected to the connector through the transition piece, the difficulty of installing the battery cell can be reduced, and by limiting the distance between the first connecting surface and the cutting edge on the same side to the above range, it can be ensured that the pole ear is in a good state after bending, so as to avoid the pole ear root squeezing the cutting edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery cell, ensuring the space utilization of the battery cell, improving the quality of the battery cell, and improving the overall performance of the electrical equipment.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0030] FIG2 is a cross-sectional view of an installation of a connector according to an embodiment of the present application;

[0031] FIG3 is a cross-sectional view of a battery cell according to an embodiment of the present application;

[0032] FIG4 is a schematic diagram of installing an insulating film according to an embodiment of the present application;

[0033] FIG5 is an exploded view of a battery cell according to an embodiment of the present application;

[0034] FIG. 6 is a table of test data of a battery cell according to an embodiment of the present application.

[0035] Figure numerals: battery cell 100, shell assembly 1, shell body 11, cover plate 12, pole column 13, pole core 2, pole piece 21, first pole piece 211, second pole piece 212, pole ear 22, cutting edge 23, first surface 24, second surface 25, connector 3, first connecting surface 31, insulating film 4, side 41, spacer 5, support portion 51, transition piece 6. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] Hereinafter, a battery cell 100 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0038] As shown in Figures 1 to 6, a battery cell 100 according to an embodiment of the present application includes: a shell assembly 1 and a pole core 2, the pole core 2 is arranged in the shell assembly 1, the pole core 2 includes a plurality of pole pieces 21, each pole piece 21 is provided with a pole ear 22 and a cutting edge 23 at both ends, and the plurality of pole pieces 21 are divided into a first pole piece 211 and a second pole piece 212 with opposite polarities, the first pole piece 211 and the second pole piece 212 are arranged in sequence, the pole ear 22 of the first pole piece 211 and the pole ear 22 of the second pole piece 211 are located on different sides of the pole core 2; the pole ear 22 located on the same side It is electrically connected to the first connecting surface 31 of the connector 3 through the transition piece 6. On the same side of the pole core 2, the distance between the first connecting surface 31 and the cutting edge 23 is L, the number of pole pieces 21 with the same polarity is n, the number of bending layers of the pole ear 22 is m, the number of bending layers of the transition piece 6 is m1, the overall thickness of the transition piece 6 is t1, the thickness of the battery cell 100 is T, the thickness of the pole piece 21 is t, and the battery cell 100 satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t+m1*t1)≤15.

[0039] In this way, the difficulty of installing the battery cell 100 can be reduced, and the tab 22 can be ensured to be in good condition after bending, so as to avoid the base of the tab 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100.

[0040] For example, as shown in Figures 1-3, a battery cell 100 includes a housing assembly 1 and a pole core 2. The housing assembly 1 is constructed in a square structure and defines a receiving cavity. The pole core 2 is mounted within the receiving cavity of the housing assembly 1. A pole post 13 is provided on the housing assembly 1. The pole post 13 can extend through the housing assembly 1 along the thickness direction to extend into the receiving cavity and is positioned opposite the pole core 2. The pole core 2 includes a plurality of pole pieces 21. Each pole piece 21 has a die-cut edge and a separating edge 23 at its ends, with a pole tab 22 connected to the die-cut edge. The plurality of pole pieces 21 are divided into a first pole piece 211 and a second pole piece 212 of opposite polarity. For example, the first pole piece 211 can be configured as a negative pole piece and the second pole piece 212 can be configured as a positive pole piece. The plurality of first pole pieces 211 and the plurality of second pole pieces 212 are arranged sequentially and insulated from each other, i.e., arranged in the order of first pole piece 211, second pole piece 212, first pole piece 211, and second pole piece 212. The pole lug 22 of the first pole piece 211 and the pole lug 22 of the second pole piece 211 are located on different sides of the pole core 2, so that the pole lugs 22 of the pole pieces 21 with opposite polarities are located on different sides, so that the pole lugs 22 of the pole pieces 21 with opposite polarities can be staggered, thereby avoiding electrical connection between the pole pieces 21 with opposite polarities.

[0041] At the same time, a connector 3 can be provided on the housing assembly 1. One side of the connector 3 is electrically connected to the pole 13 and the other side forms a first connection surface 31. The tab 22 located on one side of the pole core 2 can be connected to the first connection surface 31 via a transition piece 6, so that the pole core 2 can be electrically connected to the pole 13 via the tab 22, the transition piece 6, and the connector 3, so that the battery cell 100 can supply power to the outside through the pole 13. It should be noted that the transition piece 6 and the tab 22 are both bent so that there is a large contact area between the transition piece 6 and the tab 22, and between the transition piece 6 and the first connection surface 31.

[0042] During the installation process, the transition piece 6 is first welded to the multiple tabs 22 on the same side of the pole core 2, and then the transition piece 6 is connected to the first connection surface 31 to connect the pole post 13 and the tabs 22 of the multiple pole pieces 21 with the same polarity. This helps to reduce the difficulty of installing the battery cell 100.

[0043] Among them, on the same side of the pole core 2, the distance between the first connecting surface 31 and the cutting edge 23 on the same side can be set to L, and the number of pole pieces 21 with the same polarity (such as positive pole pieces or negative pole pieces) is set to n, the number of bending layers of the pole ear 22 is set to m, and the number of bending layers of the transition piece 6 is set to m1, the overall thickness of the transition piece 6 is set to t1, the thickness of the battery cell 100 is set to T, the thickness of the pole piece 21 is set to t, and the battery cell 100 satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t+m1*t1)≤15.

[0044] That is, the spacing L between the first connecting surface 31 and the cutting edge 23 on the same side thereof can be set to be greater than or equal to the sum of 0.5 times the reference coefficient plus 0.05 times the thickness of the electrode core 2 and 5 mm, and less than or equal to the sum of 15 times the reference coefficient plus 0.05 times the thickness of the battery cell 100 and 5 mm. The reference coefficient is the sum of the thicknesses of multiple electrode sheets 21 with the same polarity multiplied by the number of bent layers of the electrode tab 22 plus the total thickness of the transition sheet 6 multiplied by the number of bent layers of the transition sheet 6. In this way, the spacing L between the first connecting surface 31 and the cutting edge 23 on the same side thereof can be limited to a certain range, ensuring that the electrode tab 22 remains in good condition after bending, preventing the base of the electrode tab 22 from squeezing the cutting edge 23 of the opposite polarity electrode sheet 21 after bending, improving the safety and reliability of the battery cell 100, and ensuring the space utilization of the battery cell 100. This helps improve the quality of the battery cell 100.

[0045] Specifically, in the test data table for the battery cell in FIG6 , as shown in Test Data 1, the number of positive electrode sheets is set to 37 and the thickness is set to 0.013 mm, the number of negative electrode sheets is set to 38 and the thickness is set to 0.006 mm, the thickness of the battery cell 100 is 13.5 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 0.6 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.5 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 8.81 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 9 mm. At this point, the coefficient N corresponding to the positive electrode sheet is 1.45, and the coefficient N corresponding to the negative electrode sheet is 2.28. These coefficients meet the above-specified ranges, and the bending state of the tab 22 is good.

[0046] As shown in Experimental Data 2, the number of positive electrode sheets is set to 37 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 38 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 13.5 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 0.6 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.5 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 6.5 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 6.2 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 0.38, and the coefficient N corresponding to the negative electrode sheet is 0.36. These coefficients are less than the specified range. The spacing between the cut edge 23 and the connector 3 is too close, and the tab 22 is excessively squeezed by the connector 3, which is prone to short circuit.

[0047] As shown in Experimental Data 3, the number of positive electrode sheets is set to 37 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 38 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 13.5 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 0.6 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.5 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 40 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 30 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 15.88, and the coefficient N corresponding to the negative electrode sheet is 16.71. These coefficients are greater than the specified range, and the cut edge 23 is too far from the connector 3, resulting in low space utilization.

[0048] As shown in Test Data 4, the number of positive electrode sheets is set to 54 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 19.6 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 10 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 9 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 1.18, and the coefficient N corresponding to the negative electrode sheet is 1.62. These coefficients meet the above-specified ranges, and the bending state of the tab 22 is good.

[0049] As shown in Experimental Data 5, the number of positive electrode sheets is set to 54 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 19.6 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 7 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 6.5 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 0.30, and the coefficient N corresponding to the negative electrode sheet is 0.28. These coefficients are less than the specified range. The cut edge 23 is too close to the connector 3, and the tab 22 is excessively squeezed by the connector 3, which can easily cause a short circuit.

[0050] As shown in Experimental Data 6, the number of positive electrode sheets is set to 54 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 55 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 19.6 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cutting edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 58 mm, and the spacing between the cutting edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 35 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 15.28, and the coefficient N corresponding to the negative electrode sheet is 15.60. These coefficients are greater than the specified range, and the cutting edge 23 is too far from the connector 3, resulting in low space utilization.

[0051] As shown in Test Data 7, the number of positive electrode sheets is set to 65 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 28.2 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 13 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 13 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 1.61, and the coefficient N corresponding to the negative electrode sheet is 3.31. These coefficients meet the above-specified ranges, and the bending state of the tab 22 is good.

[0052] As shown in test data 8, the number of positive electrode sheets is set to 65 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 28.2 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 8 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 7 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 0.39, and the coefficient N corresponding to the negative electrode sheet is 0.30. These coefficients are less than the specified range. The cut edge 23 is too close to the connector 3, and the tab 22 is excessively squeezed by the connector 3, which can easily cause a short circuit.

[0053] As shown in Experimental Data 9, the number of positive electrode sheets is set to 65 and their thickness is set to 0.013 mm, the number of negative electrode sheets is set to 66 and their thickness is set to 0.006 mm, the thickness of the battery cell 100 is 28.2 mm, the number of folded layers of the tab 22 is 2, the number of folded layers of the transition sheet is 2, the overall thickness of the transition sheet 6 corresponding to the positive electrode sheet is set to 1.2 mm, and the overall thickness of the transition sheet 6 corresponding to the negative electrode sheet is set to 0.6 mm. The spacing between the cutting edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side is set to 70 mm, and the spacing between the cutting edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side is set to 38 mm. In this case, the coefficient N corresponding to the positive electrode sheet is 15.55, and the coefficient N corresponding to the negative electrode sheet is 15.86. These coefficients are greater than the specified range, and the cutting edge 23 is too far from the connector 3, resulting in low space utilization.

[0054] According to the battery cell 100 of the embodiment of the present application, by providing the pole ear 22 to be connected to the connector 3 through the transition piece 6, the difficulty of installing the battery cell 100 can be reduced, and by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side to the above-mentioned range, it can be ensured that the pole ear 22 is in good condition after bending, so as to avoid the root of the pole ear 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100, and also ensuring the space utilization of the battery cell 100, thereby improving the quality of the battery cell 100.

[0055] In some embodiments of the present application, the number m of the bending layers of the tab 22 is 1≤m≤3; and / or the number m1 of the bending layers of the transition piece 6 is 1≤m1≤3.

[0056] For example, as shown in FIG2 , the number m of bending layers of the tab 22 can be set to 1; or the number m of bending layers of the tab 22 can be set to 2; or the number m of bending layers of the tab 22 can be set to 3, and this application does not impose any restrictions on this. At the same time, the number m1 of bending layers of the transition piece 6 can be set to 1; or the number m1 of bending layers of the transition piece 6 can be set to 2; or the number m1 of bending layers of the transition piece 6 can be set to 3, and this application does not impose any restrictions on this.

[0057] The above arrangement can avoid excessive stress caused by too many bending layers, reduce the influence of the tabs 22 and the transition pieces 6 on the cutting edges 23 of the pole pieces 21 with opposite polarity, and improve the reliability of the battery cell 100.

[0058] In some embodiments of the present application, the length H of the battery cell 100 is 400 mm ≤ H ≤ 1500 mm. For example, as shown in FIG3 , the length H of the battery cell 100 can be set to H. The length H of the battery cell 100 can be 600 mm, 950 mm, 1300 mm, or any other value that satisfies the requirements, which is not limited by the present application.

[0059] The above configuration can prevent the battery cell 100 from being too long, thereby improving the structural stability of the battery cell 100 , and can prevent the battery cell 100 from being too short, thereby improving the energy density of the battery cell 100 and enhancing the practicality of the battery cell 100 .

[0060] In some embodiments of the present application, the width W of the battery cell 100 is 80mm≤W≤240mm. For example, as shown in FIG3 , the width W of the battery cell 100 can be 100mm; or, the width W of the battery cell 100 can be 160mm; or, the width W of the battery cell 100 can be 220mm; or, the width W of the battery cell 100 can be any value that satisfies the conditions, and this application does not impose any restrictions on this. Through the above-mentioned settings, the width of the battery cell 100 can be prevented from being too large, thereby improving the structural stability of the battery cell 100, and the width of the battery cell 100 can be prevented from being too small, thereby improving the energy density of the battery cell 100.

[0061] In some embodiments of the present application, the thickness T of the battery cell 100 is 10mm≤T≤40mm. For example, as shown in FIG4 , the thickness T of the battery cell 100 can be 15mm; or, the thickness T of the battery cell 100 can be 25mm; or, the thickness T of the battery cell 100 can be 35mm; or, the thickness T of the battery cell 100 can be any value that satisfies the conditions, and the present application does not impose any restrictions on this. Through the above-mentioned settings, it is possible to avoid the thickness of the battery cell 100 being too large and affecting the heat dissipation performance of the battery cell 100, and it is possible to avoid the thickness of the battery cell 100 being too small and affecting the structural stability of the battery cell 100, thereby improving the practicality of the battery cell 100.

[0062] In some embodiments of the present application, the tabs 22 of the pole pieces 21 with opposite polarity are located on both sides of the pole core 2 in the longitudinal direction of the pole core 2. For example, as shown in FIG3 , the two ends of the pole piece 21 along the longitudinal direction of the pole core 2 can be respectively set as the first end and the second end, and the pole posts 13 can be respectively provided at the two ends of the shell assembly 1 along the longitudinal direction. The tab 22 of the positive pole piece and the cutting edge 23 of the negative pole piece are provided at one end of the pole core 2 along the longitudinal direction, and the tab 22 of the positive pole piece can be electrically connected to the pole post 13 at the corresponding end. The tab 22 of the negative pole piece and the cutting edge 23 of the positive pole piece are provided at the other end of the pole core 2 along the longitudinal direction, and the tab 22 of the negative pole piece can be electrically connected to the pole post 13 at the corresponding end. Through the above arrangement, the probability of short circuit of the battery cell 100 can be reduced, thereby improving the reliability and practicality of the battery cell 100.

[0063] In some embodiments of the present application, the pole core 2 includes two first surfaces 24 arranged opposite to each other, and the area of ​​the first surface 24 is larger than the area of ​​the other surfaces of the pole core 2; the battery cell 100 also includes two insulating films 4, and the two insulating films 4 are respectively attached to the two first surfaces 24.

[0064] For example, as shown in Figures 4 and 5, the opposite side surfaces of the pole core 2 along the thickness direction can be set as the first surface 24, and the area of ​​the first surface 24 is larger than the area of ​​the remaining surfaces of the pole core 2. The battery cell 100 can be provided with two insulating films 4, and the insulating films 4 are configured as thermal composite films. The two insulating films 4 are respectively glued to the two first surfaces 24, and the ends of the two insulating films 4 along the width direction can be connected by an insulating member (such as an insulating connecting film), so that the insulating film 4 can surround the circumference of the pole core 2 and insulate the pole core 2 from the shell assembly 1. At the same time, the insulating film 4 can be used to be glued to the inner circumferential wall of the shell assembly 1, so that the pole core 2 can be glued inside the shell assembly 1 through the insulating film 4.

[0065] It can be understood that by gluing the insulating film 4 to the first surface 24 , the installation stability of the insulating film 4 can be improved, and the connection area between the shell assembly 1 and the pole core 2 can be increased, thereby improving the installation stability of the battery cell 100 .

[0066] In some embodiments of the present application, in the width direction of the pole core 2 , the side edges 41 of the two insulating films 4 on the same side are overlapped and connected to insulate and separate the pole core 2 from the shell assembly 1 .

[0067] For example, as shown in Figures 4 and 5, the width of the insulating film 4 can be set to be larger than the width of the pole core 2, so that the two ends of the insulating film 4 along the width direction can respectively extend to the two side surfaces of the pole core 2 along the width direction. The side edges 41 of the two insulating films 4 extending to the same side surface of the pole core 2 along the width direction can be overlapped and connected, so that the two insulating films 4 can be fixed around the circumferential outer side of the pole core 2 to insulate the pole core 2 from the shell assembly 1. This helps to reduce the number of parts in the battery cell 100, reduce processing costs, and improve the insulation performance of the battery cell 100, thereby enhancing the reliability of the battery cell 100.

[0068] In some embodiments of the present application, in the width direction of the pole core 2 , the pole core 2 is provided with a second surface 25 opposite to the pole core 2 , and the second surface 25 is provided with an adhesive, and the adhesive has an overlapping area with each insulating film 4 .

[0069] For example, as shown in Figures 4 and 5 , the side surfaces of the electrode core 2 along the width direction can be set as the second surface 25. The two second surfaces 25 are arranged opposite each other. The side edges 41 of the insulating film 4 attached to the first surface 24 can extend to a position directly opposite the second surface 25. At least the portions of the side edges 41 of the two insulating films 4 extending to the second surface 25 do not overlap. An adhesive is provided on the second surface 25. The adhesive has an overlapping area with each insulating film 4. The adhesive can be respectively bonded to the side edges 41 of the two insulating films 4 to fix the side edges 41 of the two insulating films 4 to the second surface 25. This helps to improve the installation stability of the insulating films 4 and enhances the reliability of the battery cell 100.

[0070] In some embodiments of the present application, the width of the pole core 2 is set to W, and the thickness of the pole core 2 is set to T; in the width direction parallel to the pole core 2, the width of the insulating film 4 is set to W2, satisfying: W+T≤W2≤W+2T.

[0071] For example, referring to Figures 4 and 5, the width of the pole core 2 can be set to W, and the thickness of the pole core 2 can be set to T. In the width direction parallel to the pole core 2, the width of the insulating film 4 can be set to W2, satisfying: W+T≤W2≤W+2T. In other words, the width W2 of the insulating film 4 can be set to be greater than or equal to the sum of the thickness T of the pole core 2 plus the width W of the pole core 2. When the insulating film 4 is attached to the first surface 24 of the pole core 2, the side 41 of the insulating film 4 can extend to the side of the pole core 2 along the width direction, and the size of the side 41 of the insulating film 4 extending to the side of the pole core 2 along the width direction is greater than or equal to 1 / 2T, so that the side 41 of the two insulating films 4 extending to the same side of the pole core 2 along the width direction are in contact or have overlapping parts, so that the side 41 of the two insulating films 4 can be overlapped and connected.

[0072] At the same time, the width W2 of the insulating film 4 can be set to be less than or equal to the sum of the thickness T of the pole core 2 plus twice the width W of the pole core 2, so that the side edge 41 of the insulating film 4 extending to the side of the pole core 2 along the width direction is less than or equal to T. This can prevent the side edge 41 of the insulating film 4 from extending onto the other first surface 24, thereby reducing the difficulty of installing the insulating film 4. This helps reduce the difficulty of installing the battery cell 100 and improves the practicality of the battery cell 100.

[0073] In some embodiments of the present application, the shell assembly 1 includes a shell body 11 and a cover plate 12. In the length direction of the pole core 2, cover plates 12 are provided at both ends of the shell body 11 to define a receiving cavity for placing the pole core 2. Each cover plate 12 is provided with a pole column 13.

[0074] For example, as shown in FIG5 , the housing assembly 1 includes a housing body 11 and a cover plate 12 . The housing body 11 is constructed in a square cylindrical shape, with open openings formed at both ends of the housing body 11 along the length direction. Two cover plates 12 are provided, and the two cover plates 12 are respectively installed at the two open openings of the housing body 11 to close the open openings, so that the housing body 11 and the cover plate 12 define a sealed accommodating cavity, and the pole core 2 is installed in the accommodating cavity. Each cover plate 12 is provided with a pole post 13 , which passes through the cover plate 12 along the thickness direction. The pole post 13 is used to electrically connect to the pole lug 22 of the pole piece 21 of the same polarity, so that the pole core 2 can supply power to the outside. The above arrangement helps to reduce the processing difficulty of the battery cell 100 and improve the reliability of the battery cell 100.

[0075] In some embodiments of the present application, as shown in Figure 5, the battery cell 100 of the embodiment of the present application further includes: a spacer 5, the spacer 5 is located between the inner side of the cover plate 12 and the end of the pole core 2, the spacer 5 includes a support portion 51 that stops at the pole core 2, and in the width direction of the pole core 2, support portions 51 are provided on both sides of the pole ear 22.

[0076] For example, as shown in FIG5 , a battery cell 100 can be provided with a spacer 5 . The spacer 5 is made of an elastic insulating material such as rubber and is designed to conform to the opening of the housing body 11 . The spacer 5 is installed between the inner side of the cover plate 12 (i.e., the side facing the accommodating cavity) and the end of the pole core 2 , so that the spacer 5 can insulate the cover plate 12 from the pole core 2 to prevent short circuits in the battery cell 100 . Furthermore, a support portion 51 can be formed on the side of the spacer 5 facing the pole core 2 . The support portion 51 is configured as a protruding block. The spacer 5 is provided with a support portion 51 at each end of the pole core 2 in the width direction. The two support portions 51 are located on either side of the pole tab 22 and are configured to support the end face of the pole core 2 . As a result, the support portion 51 can avoid the pole tab 22 and effectively limit the pole core 2, thereby improving the installation stability of the pole core 2 .

[0077] In some embodiments of the present application, in a width direction parallel to the pole core 2 , the width of the pole core 2 is set to W, and the support width of the support portion 51 is set to L4, satisfying: L4≤1 / 3W.

[0078] For example, as shown in Figure 3 , the width of the pole core 2 can be set to W, and the support width of the support portion 51 in a direction parallel to the width of the pole core 2 can be set to L4, satisfying the following: L4 ≤ 1 / 3W. In other words, the width of the support portion 51 can be set to be less than or equal to one-third of the width of the pole core 2, and the sum of the widths of the two support portions 51 can be less than or equal to two-thirds of the width of the pole core 2. The two support portions 51 are spaced apart and define a clearance space. The clearance space is used to avoid the tab 22 of the pole core 2, and the width of the clearance space is greater than or equal to one-third of the width of the pole core 2. This allows sufficient space to be reserved for the arrangement of the tab 22, reducing the difficulty of installing the tab 22 and improving the reliability of the battery cell 100.

[0079] The present application also proposes a battery device.

[0080] According to an embodiment of the present application, a battery device includes: a box and a plurality of battery cells 100 . The battery cell 100 is the battery cell 100 of any of the above embodiments. The plurality of battery cells 100 are disposed in the box.

[0081] For example, a battery device can be provided with a box body and a plurality of battery cells 100. The box body can be constructed as a square structure, and an installation cavity is formed in the box body. The plurality of battery cells 100 are all installed in the installation cavity, and the plurality of battery cells 100 can be arranged in sequence or spaced apart. The plurality of battery cells 100 are used for synchronous charging and discharging so that the battery module can operate stably.

[0082] According to the battery device of the embodiment of the present application, by providing the pole ear 22 to be connected to the connector 3 through the transition piece 6, the difficulty of installing the battery cell 100 can be reduced, and by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side to the above-mentioned range, it can be ensured that the pole ear 22 is in good condition after bending, so as to avoid the root of the pole ear 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100, and also ensuring the space utilization of the battery cell 100, improving the quality of the battery cell 100, and improving the reliability of the battery device.

[0083] The present application further proposes an electrical device.

[0084] An electric device according to an embodiment of the present application includes a battery device according to any of the above embodiments.

[0085] According to the electrical equipment of the embodiment of the present application, by providing the pole ear 22 to be connected to the connector 3 through the transition piece 6, the difficulty of installing the battery cell 100 can be reduced, and by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side to the above-mentioned range, it can be ensured that the pole ear 22 is in good condition after bending, so as to avoid the root of the pole ear 22 squeezing the cutting edge 23 of the opposite pole piece 21 after bending, thereby improving the safety and reliability of the battery cell 100, and can also ensure the space utilization of the battery cell 100, improve the quality of the battery cell 100, improve the reliability of the battery device, and improve the overall performance of the electrical equipment.

[0086] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means more than two, unless otherwise specifically defined.

[0088] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0089] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0091] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cell (100), wherein: include: Housing assembly (1); A pole core (2), the pole core (2) being arranged in the housing assembly (1), the pole core (2) comprising a plurality of pole pieces (21), each pole piece (21) being provided with a pole ear (22) and a cutting edge (23) at two ends thereof, the plurality of pole pieces (21) being divided into a first pole piece (211) and a second pole piece (212) having opposite polarities, the first pole piece (211) and the second pole piece (212) being arranged in sequence, the pole ear (22) of the first pole piece (211) and the pole ear (22) of the second pole piece (211) being located on different sides of the pole core (2); The pole lugs (22) located on the same side are electrically connected to the first connection surface (31) of the connector (3) via a transition sheet (6); on the same side of the pole core (2), the spacing between the first connection surface (31) and the cutting edge (23) is L, the number of pole sheets (21) with the same polarity is n, the number of bending layers of the pole lugs (22) is m, the number of bending layers of the transition sheet (6) is m1, the overall thickness of the transition sheet (6) is t1, the thickness of the battery cell (100) is T, the thickness of the pole sheet (21) is t, and the battery cell (100) satisfies the following relationship: 0.5≤N=(L-5-0.1*T / 2) / (n*m*t+m1*t1)≤15.

2. The battery cell (100) according to claim 1, wherein: The number m of the bending layers of the tab (22) is 1≤m≤3; and / or The number m1 of the bending layers of the transition piece (6) is 1≤m1≤3.

3. The battery cell (100) according to any one of claims 1 to 2, wherein: The length H of the battery cell (100) is 400 mm ≤ H ≤ 1500 mm.

4. The battery cell (100) according to claim 3, wherein: The width W of the battery cell (100) is 80 mm ≤ W ≤ 240 mm.

5. The battery cell (100) according to claim 4, wherein: The thickness T of the battery cell (100) is 10 mm ≤ T ≤ 40 mm.

6. The battery cell (100) according to any one of claims 1 to 5, wherein: In the length direction of the pole core (2), pole ears (22) of the pole pieces (21) with opposite polarities are located on both sides of the pole core (2).

7. The battery cell (100) according to claim 6, wherein: The pole core (2) comprises two first surfaces (24) arranged opposite to each other, and the area of ​​the first surface (24) is greater than the area of ​​the remaining surfaces of the pole core (2); The battery cell (100) further comprises two insulating films (4), and the two insulating films (4) are respectively attached to the two first surfaces (24).

8. The battery cell (100) according to claim 7, wherein: In the width direction of the pole core (2), the side edges (41) of the two insulating films (4) on the same side are overlapped and connected to insulate and separate the pole core (2) from the shell assembly (1).

9. The battery cell (100) according to any one of claims 7 to 8, wherein: In the width direction of the pole core (2), the pole core (2) is provided with a second surface (25) arranged opposite to the pole core, and the second surface (25) is provided with an adhesive, and the adhesive has an overlapping area with each of the insulating films (4).

10. The battery cell (100) according to claim 8, wherein: The width of the pole core (2) is set to W, and the thickness of the pole core (2) is set to T; In a width direction parallel to the pole core (2), the width of the insulating film (4) is set to W2, satisfying: W+T≤W2≤W+2T.

11. The battery cell (100) according to any one of claims 7 to 10, wherein: The housing assembly (1) comprises a housing body (11) and a cover plate (12); in the length direction of the pole core (2), the cover plates (12) are provided at both ends of the housing body (11) to define a receiving cavity for placing the pole core (2); and each cover plate (12) is provided with a pole column (13).

12. The battery cell (100) according to claim 11, wherein: Also includes: A spacer (5), the spacer (5) being located between the inner side of the cover plate (12) and the end of the pole core (2), the spacer (5) comprising a support portion (51) abutting against the pole core (2), and support portions (51) being provided on both sides of the pole ear (22) in the width direction of the pole core (2).

13. The battery cell (100) according to claim 12, wherein: In a width direction parallel to the pole core (2), the width of the pole core (2) is set to W, and the support width of the support portion (51) is set to L4, satisfying: L4≤1 / 3W.

14. A battery device, wherein: include: Box; A plurality of battery cells (100), wherein the battery cells (100) are the battery cells (100) according to any one of claims 1 to 13, and the plurality of battery cells (100) are arranged in the box.

15. An electrical device, wherein: Comprising a battery device according to claim 14.

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