Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell assembly, a battery module and a battery module, the pole core is arranged in the shell assembly, the pole core comprises a plurality of pole pieces, two ends of each pole piece are respectively provided with a pole lug and a slitting edge, the plurality of pole pieces are divided into first pole pieces and second pole pieces which are opposite in polarity, the first pole pieces and the second pole pieces are sequentially arranged, and the pole lugs of the first pole pieces and the pole lugs of the second pole pieces are positioned on different sides of the pole core; the tabs on the same side are electrically connected with the first connecting surfaces of the connecting pieces, the distance between the first connecting surfaces and the slitting edges on the same side of the pole core is L, the number of the pole pieces with the same polarity is n, the number of bent layers of the tabs is m, the thickness of the single battery is T, the thickness of the pole pieces is t, and the single battery meets the following relational expression: 0.5 < = N = (L-5-0.1 * T / 2) / (n * m * t) < = 15. Therefore, the tab can be ensured to have a good state after being bent, and the safety and the reliability of the battery monomer are improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery cell, a battery device and an electrical equipment. Background Art

[0002] Among all forms of energy, electric energy is the easiest to use, the cleanest, the most environmentally friendly and the most efficient energy. Batteries are the best devices for storing electric energy. Batteries 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 prior art, the pole pieces of the battery are usually connected to the inner lead-out pieces and the poles through the pole ears, so that the battery can supply power to the outside. The bending state of the pole ears will directly affect the quality of the battery. If the bending space of the battery pole ears is unreasonable, it will lead to poor overall quality of the battery, and there is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell that can ensure that the pole ear is in a good state after bending, so as to avoid the pole ear root from squeezing the cut edge of the opposite pole piece after bending, thereby improving the safety and reliability of the battery cell.

[0004] According to an embodiment of the present invention, a battery cell comprises: a shell assembly; a pole core, the pole core is arranged in the shell assembly, the pole core comprises a plurality of pole pieces, each of the pole pieces is provided with pole ears and cutting edges 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 ears of the first pole piece and the pole ears 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, 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 ears is m, 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) / (n*m*t)≤15.

[0005] According to the battery cell of the embodiment of the present invention, by limiting the distance between the first connecting surface and the cutting edge on the same side thereof within the above-mentioned range, it can be ensured that the pole ear is in a good state after bending, so as to avoid the root of the pole ear from 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, and improving the quality of the battery cell.

[0006] According to the battery cells of some embodiments of the present invention, the number of bending layers of the tab is 1≤m≤3.

[0007] According to some embodiments of the present invention, the length H of the battery cell is 400 mm ≤ H ≤ 1500 mm.

[0008] According to some embodiments of the present invention, the width W of the battery cell is 80 mm ≤ W ≤ 240 mm.

[0009] According to some embodiments of the present invention, the thickness T of the battery cell is 10 mm ≤ T ≤ 40 mm.

[0010] According to the battery cells of some embodiments of the present invention, the pole ears of the pole pieces with opposite polarities are located on both sides of the pole core in the length direction of the pole core.

[0011] According to the battery cell of some embodiments of the present invention, 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.

[0012] In the battery cell according to some embodiments of the present invention, 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.

[0013] In the battery cell according to some embodiments of the present invention, the pole core is provided with a second surface opposite to the pole core in the width direction thereof, and an adhesive is provided on the second surface, and the adhesive has an overlapping area with each of the insulating films.

[0014] According to the battery cells of some embodiments of the present invention, 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.

[0015] According to the battery cells of some embodiments of the present invention, 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.

[0016] According to some embodiments of the present invention, 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.

[0017] According to the battery cells of some embodiments of the present invention, 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.

[0018] The invention also provides a battery device.

[0019] A battery device according to an embodiment of the present invention comprises: a box; 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 arranged in the box.

[0020] According to the battery device of the embodiment of the present invention, by limiting the distance between the first connecting surface and the cutting edge on the same side thereof within the above-mentioned range, it can be ensured that the pole ear is in a good state after bending, so as to avoid the root of the pole ear from 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.

[0021] The invention also provides an electric device.

[0022] An electric device according to an embodiment of the present invention comprises a battery device according to any of the above embodiments.

[0023] According to the electrical equipment of the embodiment of the present invention, by limiting the distance between the first connecting surface and the cutting edge on the same side thereof within 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 from 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, improving the reliability of the battery device, and improving the overall performance of the electrical equipment.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0027] Figure 2 is a cross-sectional view of the installation of a pole core according to an embodiment of the present invention;

[0028] Figure 3 is an installation cross-sectional view of a connector according to an embodiment of the present invention;

[0029] Figure 4 is a cross-sectional view of a battery cell according to an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of installing an insulating film according to an embodiment of the present invention;

[0031] Figure 6 is an exploded view of a battery cell according to an embodiment of the present invention;

[0032] Figure 7 is a test data table of a battery cell according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Battery cell 100,

[0035] Shell assembly 1, shell body 11, cover plate 12, pole 13,

[0036] The pole core 2 , the pole piece 21 , the first pole piece 211 , the second pole piece 212 , the pole ear 22 , the cutting edge 23 , the first surface 24 , the second surface 25 , the connecting member 3 , the first connecting surface 31 , the insulating film 4 , the side edge 41 , the spacer 5 , and the supporting portion 51 . DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Hereinafter, a battery cell 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0041] like Figure 1-Figure 7 As shown, a battery cell 100 according to an embodiment of the present invention is characterized in that it 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, 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, and the pole ear 22 of the first pole piece 211 and the pole ear 22 of the second pole piece 211 are located at On different sides of the pole core 2; the pole ear 22 located on the same side is electrically connected to the first connecting surface 31 of the connecting member 3, on the same side of the pole core 2, the spacing 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 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)≤15.

[0042] In this way, the pole ear 22 can be ensured to be in good condition after bending 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, ensuring the space utilization of the battery cell 100, and improving the quality of the battery cell 100.

[0043] For example, refer to Figure 1-Figure 4As shown, the battery cell 100 is provided with a shell assembly 1 and a pole core 2. The shell assembly 1 is constructed as a square structure and is formed with a receiving cavity. The pole core 2 is installed in the receiving cavity of the shell assembly 1, and a pole column 13 is provided on the shell assembly 1. The pole column 13 can penetrate the shell assembly 1 in the thickness direction to extend into the receiving cavity and is arranged opposite to the pole core 2. The pole core 2 includes a plurality of pole pieces 21, and each pole piece 21 has a grinding edge and a cutting edge 23 at both ends, and a pole ear 22 is connected to the grinding edge. The plurality of pole pieces 21 are divided into a first pole piece 211 and a second pole piece 212 with opposite polarities. For example, the first pole piece 211 can be set as a negative pole piece and the second pole piece 212 can be set as a positive pole piece. The plurality of first pole pieces 211 and the plurality of second pole pieces 212 are arranged in sequence and insulated and separated, that is, they are arranged in the order of the first pole piece 211, the second pole piece 212, the first pole piece 211, and the 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.

[0044] At the same time, a connector 3 may be provided on the side wall of the housing assembly 1, one side of the connector 3 is electrically connected to the pole 13 and the other side is formed with a first connection surface 31, and the first connection surface 31 may be fitted with the pole ear 22 located on one side of the pole core 2, so that the pole core 2 can be electrically connected to the pole 13 through the pole ear 22 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 pole ear 22 is bent so that the pole ear 22 can contact the first connection surface 31 with a large area.

[0045] Among them, on the same side of the pole core 2, the spacing between the first connecting surface 31 and the cutting edge 23 can be set to L, the number of pole pieces 21 (such as positive pole pieces or negative pole pieces) with the same polarity can be set to n, the number of bending layers of the pole ear 22 can be set to m, the thickness of the battery cell 100 is set to T, and 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)≤15.

[0046] That is to say, the spacing L between the first connection 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 pole 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 product of the sum of the thicknesses of multiple pole pieces 21 with the same polarity multiplied by the number of bending layers of the pole tab 22. In this way, the spacing L between the first connection surface 31 and the cutting edge 23 on the same side thereof can be limited within a certain range, which can ensure that the pole tab 22 is in a good state after bending, so as to avoid the root of the pole 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 and ensuring the space utilization rate of the battery cell 100. As a result, it is beneficial to improve the quality of the battery cell 100.

[0047] Specifically, in Figure 7 In the test data table of the battery cell, as shown in test data 1, the number of positive electrode sheets can be set to 37 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 38 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be 13.5 mm, the number of bending layers of the tab 22 can be 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side can be 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 can be set to 9 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 2.17, and the coefficient N corresponding to the negative electrode sheet is 4.86, then the coefficients meet the above specified range, and the bending state of the tab 22 is good.

[0048] As shown in the experimental data 2, the number of positive electrode sheets can be set to 37 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 38 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be 13.5 mm, the number of bending layers of the tab 22 can be 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side can be set to 5.9 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side can be set to 6 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 0.16, and the coefficient N corresponding to the negative electrode sheet is 0.47, which is less than the above specified range, the cut edge 23 is too close to the connector 3, the tab 22 is over-extruded by the connector 3, and it is easy to short-circuit.

[0049] As shown in the test data 3, the number of positive electrode sheets can be set to 37 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 38 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be set to 13.5 mm, the number of bending layers of the tab can be set to 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side can be set to 27.78 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side can be set to 17.5 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.32, and the coefficient N corresponding to the negative electrode sheet is 17.29, which is greater than the above-mentioned specified range, and the cut edge 23 is too far away from the connector 3, and the space utilization rate is low.

[0050] As shown in the test data 4, the number of positive electrode sheets can be set to 54 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 55 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be 19.6 mm, the number of bending layers of the tab 22 can be 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side can be set to 9.11 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side can be set to 9 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 1.49, and the coefficient N corresponding to the negative electrode sheet is 4.58, so the coefficients meet the above specified range, and the bending state of the tab 22 is good.

[0051] As shown in the test data 5, the number of positive electrode sheets can be set to 54 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 55 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be 19.6 mm, the number of bending layers of the tab 22 can be 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connection surface 31 on the corresponding side can be set to 6.57 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connection surface 31 on the corresponding side can be set to 6.28 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 0.28, and the coefficient N corresponding to the negative electrode sheet is 0.45, which is less than the above specified range, the cut edge 23 is too close to the connector 3, the tab 22 is over-extruded by the connector 3, and it is easy to short-circuit.

[0052] As shown in the test data 6, the number of positive electrode sheets can be set to 54 and the thickness can be set to 0.013 mm, the number of negative electrode sheets can be set to 55 and the thickness can be set to 0.006 mm, the thickness of the battery cell 100 can be set to 19.6 mm, the number of bending layers of the tab 22 can be set to 3, the spacing between the cut edge 23 of the negative electrode sheet and the first connecting surface 31 on the corresponding side can be set to 38 mm, and the spacing between the cut edge 23 of the positive electrode sheet and the first connecting surface 31 on the corresponding side can be set to 17.5 mm. At this time, the coefficient N corresponding to the positive electrode sheet is 15.2, and the coefficient N corresponding to the negative electrode sheet is 16.7, which is greater than the above-mentioned specified range, and the cut edge 23 is too far away from the connector 3, and the space utilization rate is low.

[0053] According to the battery cell 100 of the embodiment of the present invention, by limiting the distance between the first connecting surface 31 and the cutting edge 23 of the pole piece 21 on the same side thereof to the above-mentioned range, it can be ensured that the pole ear 22 is in a good state 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, ensuring the space utilization of the battery cell 100, and improving the quality of the battery cell 100.

[0054] In some embodiments of the present invention, the number of bending layers of the tab 22 is 1≤m≤3. Figure 2-Figure 3 As shown, the number of bending layers of the pole tab 22 can be set to 1; or the number of bending layers of the pole tab 22 can be set to 2; or the number of bending layers of the pole tab 22 can be set to 3, and the present application does not limit this. Through the above settings, it is possible to avoid excessive stress on the connector 3 due to too many layers of the connector 3, reduce the influence of the connector 3 on the cutting edge 23 of the pole piece 21 with opposite polarity, and improve the reliability of the battery cell 100.

[0055] In some embodiments of the present invention, the length H of the battery cell 100 is 400 mm ≤ H ≤ 1500 mm. Figure 4 As shown, the length of the battery cell 100 can be set to H. The length H of the battery cell 100 can be set to 600 mm; or, the length H of the battery cell 100 can be set to 950 mm; or, the length H of the battery cell 100 can be set to 1300 mm; or, the length H of the battery cell 100 can be set to any value that satisfies the conditions, and the present application does not limit this.

[0056] The above configuration can avoid the battery cell 100 from being too long, thereby improving the structural stability of the battery cell 100 , and can avoid the battery cell 100 from being too short, thereby improving the energy density of the battery cell 100 and improving the practicality of the battery cell 100 .

[0057] In some embodiments of the present invention, the width W of the battery cell 100 is 80 mm ≤ W ≤ 240 mm. Figure 4 As shown, the width W of the battery cell 100 can be set to 100 mm; or, the width W of the battery cell 100 can be set to 160 mm; or, the width W of the battery cell 100 can be set to 220 mm; or, the width W of the battery cell 100 can be set to any value that satisfies the conditions, and the present application does not impose any restrictions on this. Through the above settings, the width of the battery cell 100 can be avoided from being too large, thereby improving the structural stability of the battery cell 100, and the width of the battery cell 100 can be avoided from being too small, thereby improving the energy density of the battery cell 100.

[0058] In some embodiments of the present invention, the thickness T of the battery cell 100 is 10 mm ≤ T ≤ 40 mm. Figure 2 As shown, the thickness T of the battery cell 100 can be set to 15 mm; or, the thickness T of the battery cell 100 can be set to 25 mm; or, the thickness T of the battery cell 100 can be set to 35 mm; or, the thickness T of the battery cell 100 can be set to any value that satisfies the conditions, and this application does not impose any restrictions on this. Through the above settings, it is possible to avoid the thickness of the battery cell 100 being too large to affect 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 to affect the improvement of the structural stability of the battery cell 100, thereby improving the practicality of the battery cell 100.

[0059] In some embodiments of the present invention, the pole ears 22 of the pole pieces 21 with opposite polarities are located on both sides of the pole core 2 in the length direction of the pole core 2. Figure 4 As shown, the two ends of the pole piece 21 along the length direction of the pole core 2 can be set as the first end and the second end respectively, and the pole column 13 can be respectively provided at the two ends of the shell assembly 1 along the length direction, the pole ear 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 length direction, and the pole ear 22 of the positive pole piece can be electrically connected to the pole column 13 at the corresponding end, and the pole ear 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 length direction, and the pole ear 22 of the negative pole piece can be electrically connected to the pole column 13 at the corresponding end. Through the above arrangement, the probability of short circuit of the battery cell 100 can be reduced, and the reliability and practicality of the battery cell 100 can be improved.

[0060] In some embodiments of the present invention, 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 remaining 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.

[0061] For example, refer to Figure 5-Figure 6 As shown, the opposite side of the pole core 2 in the thickness direction can be set as the first surface 24, and the area of ​​the first surface 24 is greater than the area of ​​the remaining surface of the pole core 2. The battery cell 100 can be provided with two insulating films 4, and the insulating films 4 are set as thermal composite films. The two insulating films 4 are respectively glued on the two first surfaces 24, and the ends of the two insulating films 4 in 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 to insulate and separate 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 in the shell assembly 1 through the insulating film 4.

[0062] 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 .

[0063] In some embodiments of the present invention, 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 .

[0064] For example, refer to Figure 5-Figure 6 As shown, 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 extend to the two sides of the pole core 2 along the width direction respectively, and the side edges 41 of the two insulating films 4 extending to the same side 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 outer side of the pole core 2 in the circumferential direction to insulate and separate the pole core 2 from the shell assembly 1. As a result, the number of parts of the battery cell 100 is reduced, the processing cost is reduced, and the insulation performance of the battery cell 100 can be improved, thereby improving the reliability of the battery cell 100.

[0065] In some embodiments of the present invention, in the width direction of the pole core 2 , the pole core 2 is provided with a second surface 25 opposite to each other, and the second surface 25 is provided with an adhesive, and the adhesive has an overlapping area with each insulating film 4 .

[0066] For example, refer to Figure 5-Figure 6 As shown, the side of the pole core 2 along the width direction can be set as the second surface 25, and the two second surfaces 25 are arranged oppositely. The side edge 41 of the insulating film 4 attached to the first surface 24 can extend to the position facing the second surface 25, and at least part of the side edges 41 of the two insulating films 4 extending to the second surface 25 do not overlap, and an adhesive is provided on the second surface 25. The adhesive has an overlapping area with each insulating film 4, and 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 on the second surface 25. Therefore, it is beneficial to improve the installation stability of the insulating film 4 and improve the reliability of the battery cell 100.

[0067] In some embodiments of the present invention, 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.

[0068] For example, refer to Figure 5-Figure 6As shown, 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.

[0069] 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 2 times 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, which can prevent the side edge 41 of the insulating film 4 from extending to the other first surface 24, which is conducive to reducing the difficulty of installing the insulating film 4. Therefore, it is conducive to reducing the difficulty of installing the battery cell 100 and improving the practicality of the battery cell 100.

[0070] In some embodiments of the present invention, 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, and each cover plate 12 is provided with a pole column 13.

[0071] For example, refer to Figure 6 As shown, the shell assembly 1 includes a shell body 11 and a cover plate 12. The shell body 11 is constructed in a square cylindrical shape. The shell body 11 is formed with open openings at both ends along the length direction. The cover plates 12 are provided in two pieces. The two cover plates 12 are used to be installed at the two open openings of the shell body 11 to close the open openings, so that the shell body 11 and the cover plate 12 define a sealed accommodating cavity. The pole core 2 is installed in the accommodating cavity. Each cover plate 12 is provided with a pole column 13. The pole column 13 penetrates the cover plate 12 along the thickness direction. The pole column 13 is used to be electrically connected to the pole ear 22 of the pole piece 21 of the same polarity, so that the pole core 2 can supply power to the outside. Through the above-mentioned arrangement, it is helpful to reduce the processing difficulty of the battery cell 100 and improve the reliability of the battery cell 100.

[0072] In some embodiments of the present invention, Figure 6 As shown, the battery cell 100 according to the embodiment of the present invention further includes: a spacer 5, which is located between the inner side of the cover plate 12 and the end of the pole core 2, and 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.

[0073] For example, refer to Figure 6 As shown, the battery cell 100 can be provided with a spacer 5, the material of the spacer 5 is set to be an elastic insulating material such as rubber, the spacer 5 is designed to follow the open mouth of the shell body 11, and the spacer 5 is used to be 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 and separate the cover plate 12 and the pole core 2 to avoid a short circuit in the battery cell 100. At the same time, a support portion 51 can be formed on the side of the spacer 5 facing the pole core 2, and the support portion 51 is configured as a convex block structure. The spacer 5 is provided with support portions 51 at both ends of the pole core 2 in the width direction, and the two support portions 51 are respectively located at the two sides of the pole ear 22 and are used to support the end surface of the pole core 2. As a result, the support portion 51 can avoid the pole ear 22 and effectively limit the pole core 2, thereby improving the installation stability of the pole core 2.

[0074] In some embodiments of the present invention, 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.

[0075] For example, refer to Figure 4 As shown, the width of the pole core 2 can be set to W, and in the direction parallel to the width of the pole core 2, the support width of the support portion 51 can be set to L4, satisfying: 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, the sum of the widths of the two support portions 51 is less than or equal to two-thirds of the width of the pole core 2, the two support portions 51 are arranged spaced apart and define an avoidance space, the avoidance space is used to avoid the pole lug 22 of the pole core 2, and the width of the avoidance space is greater than or equal to one-third of the width of the pole core 2. In this way, sufficient space can be reserved for the arrangement of the pole lug 22, reducing the difficulty of installing the pole lug 22 and improving the reliability of the battery cell 100.

[0076] The invention also provides a battery device.

[0077] The battery device according to the embodiment of the present invention comprises: a box body and a plurality of battery cells 100 . The battery cells 100 are the battery cells 100 of any of the above embodiments. The plurality of battery cells 100 are arranged in the box body.

[0078] For example, a battery device may be provided having a box body and a plurality of battery cells 100. The box body may be constructed as a square structure, with an installation cavity formed inside the box body. The plurality of battery cells 100 are all installed in the installation cavity, and the plurality of battery cells 100 may be arranged sequentially or spaced apart. The plurality of battery cells 100 are used for synchronous charging and discharging so that the battery module can operate stably.

[0079] According to the battery device of the embodiment of the present invention, by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side thereof to the above-mentioned range, it can be ensured that the pole ear 22 is in a good state 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, 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.

[0080] The present invention further provides an electrical device.

[0081] An electric device according to an embodiment of the present invention includes a battery device according to any one of the above embodiments.

[0082] According to the electrical equipment of the embodiment of the present invention, by limiting the distance between the first connecting surface 31 and the cutting edge 23 on the same side thereof to the above-mentioned range, it can be ensured that the pole ear 22 is in a good state 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 ensuring the space utilization rate of the battery cell 100, improving the quality of the battery cell 100, improving the reliability of the battery device, and improving the overall performance of the electrical equipment.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", 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 invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that: 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 connecting surface (31) of the connecting member (3); 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 lugs (22) is m, 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)≤15.

2. The battery cell (100) according to claim 1, characterized in that: The number of bending layers of the tab (22) is 1≤m≤3.

3. The battery cell (100) according to claim 1, characterized in that: The length H of the battery cell (100) is 400 mm ≤ H ≤ 1500 mm.

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

5. The battery cell (100) according to claim 4, characterized in that: 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, characterized in that: The pole ears (22) of the pole pieces (21) with opposite polarities are located on both sides of the pole core (2) in the length direction of the pole core (2).

7. The battery cell (100) according to claim 6, characterized in that: 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, characterized in that: 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 claim 7, characterized in that: 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, characterized in that: 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 claim 7, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 equipment, characterized in that: Comprising a battery device according to claim 14.

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