Battery cell and electric equipment

Abstract

The utility model provides a battery cell and electric equipment. The battery cell comprises a diaphragm, and the diaphragm is bent and extends in the length direction of the battery cell; the polarity of the second pole piece is opposite to that of the first pole piece; the first adapter is sequentially connected with the plurality of first adapter positions, the second adapter is sequentially connected with the plurality of second adapter positions, the first adapter and the second adapter form two external ports of the battery cell, and the diaphragm is bent and extends in the length direction of the battery cell. Therefore, the pole pieces can be arranged on the two sides of the bent part of the diaphragm at the same time, and the assembly efficiency between the diaphragm and the pole pieces in the battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery structure, specifically, the utility model relates to a kind of battery and electric equipment. BACKGROUND

[0002] Developing negative electrode material with high specific capacity becomes an effective path to improve the energy density of battery. However, the negative electrode material is often accompanied by significant volume expansion in the charge and discharge cycle, which may lead to the destruction of the internal structure of the battery, affecting the overall performance and safety of the battery. SUMMARY

[0003] One object of the utility model is to provide a new technical solution for battery and electric equipment.

[0004] According to the first aspect of the utility model, a battery is provided, comprising:

[0005] A separator extends in the length direction of the battery.

[0006] A first electrode plate is disposed on one side surface of the separator and has a plurality of first adapter sites arranged at intervals.

[0007] A second electrode plate is disposed on the other side surface of the separator and has a plurality of second adapter sites arranged at intervals, and the polarity of the second electrode plate is opposite to that of the first electrode plate.

[0008] A first adapter and a second adapter, the first adapter sequentially connects a plurality of first adapter sites, the second adapter sequentially connects a plurality of second adapter sites, and the first adapter and the second adapter form two external ports of the battery.

[0009] Optionally, the separator comprises a plurality of integrally connected sub-separators, and a bending angle is formed between adjacent sub-separators; or,

[0010] Adjacent sub-separators are connected in an arc shape.

[0011] Optionally, a plurality of bending angles are formed at a plurality of bending positions of the separator, and the sizes of a plurality of bending angles are equal; or,

[0012] A plurality of arc angles are formed at a plurality of bending positions of the separator, and the sizes of a plurality of arc angles are equal.

[0013] Optionally, the first pole piece comprises a plurality of first sub-pole pieces, each of the first sub-pole pieces comprising a first sub-piece and a second sub-piece integrally connected; a bending angle of the first pole piece is formed between the first sub-piece and the second sub-piece, and the bending angle of the first pole piece matches a first bending angle between the sub-septa; or, the first sub-piece and the second sub-piece are connected with a first arc, and the first arc matches a first insolation angle between adjacent sub-septa; and / or,

[0014] the second pole piece comprises a plurality of second sub-pole pieces, each of the second sub-pole pieces comprising a third sub-piece and a fourth sub-piece integrally connected; a bending angle of the second pole piece is formed between the third sub-piece and the fourth sub-piece, and the bending angle of the second pole piece matches a second bending angle between the sub-septa; or, the third sub-piece and the fourth sub-piece are connected with a second arc, and the second arc matches a second insolation angle between adjacent sub-septa.

[0015] Optionally, the first sub-piece is arranged on a side of one of the sub-septa away from the other sub-septa at the first bending angle, and the second sub-piece is arranged on a side of the other of the sub-septa away from the one sub-septa at the first bending angle; and / or,

[0016] the third sub-piece is arranged on a side of one of the sub-septa away from the other sub-septa at the second bending angle, and the fourth sub-piece is arranged on a side of the other of the sub-septa away from the one sub-septa at the second bending angle.

[0017] Optionally, the first adapter site is arranged at a connection between the first sub-piece and the second sub-piece; and / or,

[0018] the second adapter site is arranged at a connection between the third sub-piece and the fourth sub-piece.

[0019] Optionally, the first bending angle and the second bending angle are arranged on opposite sides of the battery cell in the width direction and are spaced apart on the septum.

[0020] Optionally, further comprising a packaging body, the septum, the first pole piece and the second pole piece forming a battery cell main body, and the packaging body covering the battery cell main body.

[0021] In the length direction of the battery cell, a reserved gap is formed between the packaging body and the battery cell main body.

[0022] Optionally, further comprising a fastening band, the fastening band surrounding the first pole piece and the second pole piece in the width direction of the battery cell, and fastening the first pole piece and the second pole piece in the length direction of the battery cell.

[0023] Correspondingly, the utility model also provides a kind of electric equipment, and the electric equipment includes the electric core of first aspect.

[0024] Other features of the present utility model and its advantages will become clear from the following detailed description of exemplary embodiments thereof with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model.

[0026] Figure 1 It is an internal structure schematic view of electric core for one embodiment of the present utility model;

[0027] Figure 2 It is a side view of electric core for one embodiment of the present utility model;

[0028] Figure 3 It is a top view of electric core for one embodiment of the present utility model;

[0029] Figure 4 It is a bottom view of electric core for one embodiment of the present utility model;

[0030] Figure 5 It is an expansion schematic view of electric core for one embodiment of the present utility model;

[0031] Figure 6 It is a schematic view of diaphragm, first pole piece and second pole piece of electric core for one embodiment of the present utility model;

[0032] Figure 7 It is a partial schematic view of internal structure of electric core for one embodiment of the present utility model;

[0033] Figure 8 It is an internal structure schematic view of electric core for another embodiment of the present utility model.

[0034] Wherein:

[0035] 1, diaphragm;

[0036] 2, first pole piece; 21, first switching site; 22, first current collector;

[0037] 3, second pole piece; 31, second switching site; 32, second current collector;

[0038] 4, first switching piece;5, second switching piece;6, first pole lug;7, second pole lug;8, encapsulation;9, fastening belt. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless specifically stated otherwise.

[0040] The embodiments of the present application will be described in detail below with reference to the drawings. The embodiments described below are examples for explaining the present application and are not intended to limit the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative work fall within the scope of the present application.

[0041] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be noted that unless otherwise specifically stated and limited, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] It should be noted that similar reference numerals and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0045] The embodiment of the present application provides a battery cell, a diaphragm of the battery cell is bent and extended in the battery cell, the diaphragm can reserve an expansion amount for the battery cell through a gap formed by the bending; when a first pole piece and a second pole piece are arranged on opposite sides of the diaphragm respectively, the second pole piece is opposite to the first pole piece in polarity, the diaphragm can separate the first pole piece and the second pole piece on one hand, and avoid the contact short circuit between the first pole piece and the second pole piece; on the other hand, the diaphragm can provide space for the volume expansion of the pole piece through the gap formed by the bending of the diaphragm in the charging and discharging process of the battery cell, so that the capacity and stability of the battery cell are ensured.

[0046] In some embodiments, with reference to Figure 1 and Figure 6 , the embodiment of the present application provides a battery cell, the battery cell comprises:

[0047] a diaphragm 1, the diaphragm 1 is bent and extended in the length direction of the battery cell;

[0048] a first pole piece 2, the first pole piece 2 is arranged on one side surface of the diaphragm 1 and has a plurality of first switching positions 21 arranged at intervals;

[0049] a second pole piece 3, the second pole piece 3 is arranged on the other side surface of the diaphragm 1 and has a plurality of second switching positions 31 arranged at intervals, and the second pole piece 3 is opposite to the first pole piece 2 in polarity;

[0050] a first switching piece 4 and a second switching piece 5, the first switching piece 4 is connected to the plurality of first switching positions 21 in sequence, the second switching piece 5 is connected to the plurality of second switching positions 31 in sequence, and the first switching piece 4 and the second switching piece 5 form two external ports of the battery cell.

[0051] In this embodiment, the diaphragm 1 is provided with a positive pole piece and a negative pole piece on two sides respectively, on one hand, the diaphragm 1 can block the electron transmission between the positive pole piece and the negative pole piece, and prevent the direct contact between the positive pole piece and the negative pole piece from short circuiting; on the other hand, the diaphragm 1 can make the lithium ions pass normally, so that the lithium ions shuttle back and forth between the positive pole piece and the negative pole piece, and then the charging and discharging of the battery cell are realized.

[0052] Meanwhile, the diaphragm 1 is bent and extended in the length direction of the battery cell, for example, the length direction of the battery cell can be the vertical direction in Figure 1 , the extension direction of the diaphragm 1 is generally consistent with the length direction of the battery cell, and meanwhile, the length direction of the battery cell has an expansion allowance, so that the battery cell can expand along the length direction, and the energy density of the battery cell is improved.

[0053] Moreover, the diaphragm 1 is arranged in the length direction of the battery cell and is folded back and forth in the battery cell, so that the pole piece is arranged on both sides of the folding position of the diaphragm 1, such as the first pole piece 2 or the second pole piece 3, thereby improving the assembly efficiency of the diaphragm and the pole piece in the battery cell.

[0054] In one embodiment, the first pole piece 2 and the second pole piece 3 are arranged on both sides of the diaphragm 1, and the first pole piece 2, the second pole piece 3 and the diaphragm 1 are pressed tightly, and the expansion allowance is arranged in the length direction, and the expansion allowance is adjacent to the first pole piece 2, the second pole piece 3 and the diaphragm 1 in the length direction after being pressed tightly.

[0055] In another embodiment, the first pole piece 2 and the second pole piece 3 are arranged on both sides of the diaphragm 1, and a folding gap is formed between the adjacent two parts of the diaphragm at the folding position; and in the case of multiple folding of the diaphragm 1, the diaphragm 1 can form multiple spaced folding gaps in the length direction of the battery cell, so as to improve the reserved space of the battery cell during expansion. That is, the expansion allowance is dispersed in multiple folding gaps.

[0056] Specifically, the first pole piece 2 and the second pole piece 3 are arranged on both sides of the diaphragm 1 respectively, and the polarity of the second pole piece 3 is opposite to that of the first pole piece 2, such as the first pole piece 2 being a positive pole piece and the second pole piece 3 being a negative pole piece, or the first pole piece 2 being a negative pole piece and the second pole piece 3 being a positive pole piece; the diaphragm 1 can separate the first pole piece 2 and the second pole piece 3 to avoid contact short circuit between the first pole piece 2 and the second pole piece 3; and during the charging and discharging process of the battery cell, the volume of the first pole piece 2 and the second pole piece 3 will expand, especially in the length direction of the battery cell. The expansion of the first pole piece 2 and the second pole piece 3 is more obvious. The embodiments of the present application provide expansion space for the volume expansion of the first pole piece 2 and the second pole piece 3 by arranging the diaphragm 1, the first pole piece 2 and the second pole piece 3 in the length direction of the battery cell, avoiding the extrusion damage of the first pole piece 2 and the second pole piece 3 during expansion, and ensuring the capacity and stability of the battery cell, so that the overall performance of the internal structure of the battery cell is safer.

[0057] For the convenience of understanding, the spacing of the diaphragm 1 is shown in the drawings of the present application. It should be pointed out that the scheme is also applicable to the case where the first pole piece 2, the second pole piece 3 and the diaphragm 1 are pressed tightly, and the details are not repeated.

[0058] Referring to Figure 1 , the first pole piece 2 has a plurality of first switching positions 21 arranged at intervals, and the width direction of the battery cell is perpendicular to the length direction of the battery cell, such as the width direction of the battery cell being Figure 1The first adapter 4 and the second adapter 5 can be connected with the cable or the terminal outside the battery cell, so that the two external ports formed by the first adapter 4 and the second adapter 5 can be used to charge the battery cell or output the electric quantity of the battery cell to the outside, thereby ensuring the stability of the charging and discharging path of the battery cell.

[0059] The first adapter 4 and the second adapter 5 can be connected with the cable or the terminal outside the battery cell, so that the two external ports formed by the first adapter 4 and the second adapter 5 can be used to charge the battery cell or output the electric quantity of the battery cell to the outside, thereby ensuring the stability of the charging and discharging path of the battery cell.

[0060] In an embodiment, the battery cell has a length dimension, a width dimension and a thickness dimension, the length dimension of the battery cell is greater than the width dimension, and the length dimension of the battery cell is the dimension of the battery cell in the length direction.

[0061] Referring to Figure 1 , the length direction of the battery cell can be the Y direction in Figure 1 , and the width direction of the battery cell can be the X direction in Figure 1 , the diaphragm 1 extends along the Y direction and bends left and right; the first pole piece 2 and the second pole piece 3 are respectively arranged on the left and right sides of the diaphragm 1, the first adapter 4 sequentially connects a plurality of first adapter positions 21 on the first pole piece 2 and is located on one side of the diaphragm 1 in the X direction; the second adapter 5 sequentially connects a plurality of second adapter positions 31 on the second pole piece 3 and is located on the other side of the diaphragm 1 in the X direction, thereby ensuring the isolation degree between the first adapter 4 and the second adapter 5.

[0062] In an embodiment, the diaphragm 1 can be a PP (polypropylene) diaphragm or a PE (polyethylene) diaphragm, so as to maintain the mechanical strength and processing performance of the diaphragm 1 and ensure the safety performance of the battery cell.

[0063] In an embodiment, referring to Figure 1The first adapter position 21 can be a plurality of first through holes arranged at intervals on the first pole piece 2, and the plurality of first through holes form a linearly arranged through channel in the length direction of the battery cell, so that the first adapter 4 in linear structure is sequentially arranged through the plurality of first through holes and connected to the first pole piece 2. The second adapter position 31 can be a plurality of second through holes arranged at intervals on the second pole piece 3, and the plurality of second through holes form a linearly arranged through channel in the length direction of the battery cell, so that the second adapter 5 in linear structure is sequentially arranged through the plurality of second through holes and connected to the second pole piece 3. The above design can shorten the transmission path of the first adapter 4 and the second adapter 5, reduce the impedance of the battery cell through the first adapter 4 and the second adapter 5, and facilitate the rapid charging of the battery cell.

[0064] In the battery cell provided by the embodiment of the present application, the diaphragm 1 is bent and extended in the length direction of the battery cell, so that the pole pieces are arranged on both sides of the bent position of the diaphragm 1, and the assembly efficiency between the diaphragm and the pole pieces in the battery cell is improved.

[0065] In some embodiments, the diaphragm 1 includes a plurality of integrally connected sub-diaphragms, and a bending angle is formed between adjacent sub-diaphragms, as shown in Figure 1 , or

[0066] Adjacent sub-diaphragms are connected in an arc shape, as shown in Figure 8 .

[0067] In this embodiment, the diaphragm 1 can be extended in a Z shape in the length direction of the battery cell, that is, the diaphragm 1 is bent back and forth left and right in the length direction of the battery cell, and a sub-diaphragm is formed between adjacent bending positions. A bending angle is formed at the bending position of the diaphragm, that is, at the position where the adjacent sub-diaphragms are connected, so that the diaphragm 1 forms a plurality of sub-diaphragms in the length direction of the battery cell. The two sides of the plurality of sub-diaphragms can be respectively provided with the first pole piece 2 and the second pole piece 3 to ensure the charge and discharge capacity of the battery cell.

[0068] Alternatively, the diaphragm 1 can be extended in an S shape in the length direction of the battery cell, that is, the diaphragm 1 is smoothly bent in the length direction of the battery cell, and a sub-diaphragm is formed between adjacent bending positions. The bending position of the diaphragm, that is, the position where the adjacent sub-diaphragms are connected, is connected in an arc shape. On the basis of facilitating the diaphragm 1 to form a plurality of sub-diaphragms in the length direction of the battery cell, the fitting degree between the first pole piece 2 and the second pole piece 3 and the diaphragm 1 can be improved, so as to ensure the compactness of the structure of the battery cell.

[0069] In some embodiments, referring to Figure 1 , a plurality of bending angles are formed at the bending positions of the diaphragm 1, and the angles of the plurality of bending angles are equal; or

[0070] A plurality of radian angles are formed at the bending positions of the diaphragm 1, and the radian sizes of the plurality of radian angles are equal.

[0071] In this embodiment, when the diaphragm 1 extends in the length direction of the battery cell, it can be bent inward after being spaced apart from the length of a sub-diaphragm to form a bent included angle between adjacent sub-diaphragms; at the same time, the bent included angle between any two adjacent sub-diaphragms is kept at a set included angle, that is, the diaphragm 1 is folded inward at the same included angle after extending the length of a sub-diaphragm, so that the bent included angles of the diaphragm at multiple bending places are equal, ensuring the compactness of the battery cell structure and the consistency of the bending gap between adjacent sub-diaphragms.

[0072] Alternatively, the diaphragm 1 extends smoothly inward after being spaced apart from the length of a sub-diaphragm to form an inwardly extending arc angle between adjacent sub-diaphragms; at the same time, the inwardly extending arc angle between any two adjacent sub-diaphragms is kept at a set arc angle, that is, the diaphragm 1 extends inward at the same arc angle after extending the length of a sub-diaphragm, so that the arc angles of the diaphragm at multiple bending places are equal, so that the space size of the bending gap formed between adjacent sub-diaphragms remains unchanged.

[0073] In some embodiments, referring to Figure 1 , the first tab 2 includes a plurality of first sub-tabs, each first sub-tab including a first sub-tab and a second sub-tab connected integrally; a bent included angle of the first tab 2 is formed between the first sub-tab and the second sub-tab, and the bent included angle of the first tab 2 matches the first bent included angle between adjacent sub-diaphragms; or, the first sub-tab and the second sub-tab are connected at a first arc, and the first arc matches the first arc angle between adjacent sub-diaphragms; and / or,

[0074] The second tab 3 includes a plurality of second sub-tabs, each second sub-tab including a third sub-tab and a fourth sub-tab connected integrally; a bent included angle of the second tab 3 is formed between the third sub-tab and the fourth sub-tab, and the bent included angle of the second tab 3 matches the second bent included angle between adjacent sub-diaphragms; or, the third sub-tab and the fourth sub-tab are connected at a second arc, and the second arc matches the second arc angle between adjacent sub-diaphragms.

[0075] In this embodiment, the first sub-tab of the first tab 2 can be spaced apart in the length direction of the battery cell, and the first sub-tab formed by connecting the first sub-tab and the second sub-tab can be V-shaped. The first sub-tab and the second sub-tab form a bent included angle of the first tab 2 at the connection, and the bent included angle of the first tab 2 matches the first bent included angle between adjacent sub-diaphragms, such as the bent included angle of the first tab 2 being equal to the first bent included angle between adjacent sub-diaphragms, so that when the first sub-tab can be attached to one of the adjacent sub-diaphragms, the second sub-tab can be attached to another of the adjacent sub-diaphragms, ensuring the compactness of the cooperation between the diaphragm 1 and the first tab 2.

[0076] Alternatively, the first sub-pole piece formed by connecting the first sub-piece and the second sub-piece can be in a U shape, the first sub-piece and the second sub-piece form a first arc of the first pole piece 2 at the connection, and the first arc of the first pole piece 2 matches the first angle between the adjacent sub-membranes, such as the first arc of the first pole piece 2 is equal in size to the first angle between the adjacent sub-membranes, so that when the first sub-piece is attached to one of the adjacent sub-membranes, the second sub-piece can be attached to the other of the adjacent sub-membranes, so that the cooperation between the sub-membrane 1 and the first pole piece 2 is more compact.

[0077] In this embodiment, the second sub-pole piece of the second pole piece 3 can be arranged at intervals in the length direction of the battery cell, and the second sub-pole piece formed by connecting the third sub-piece and the fourth sub-piece can be in a V shape, and the third sub-piece and the fourth sub-piece form a bending angle of the second pole piece 3 at the connection, and the bending angle of the second pole piece 3 matches the second bending angle between the adjacent sub-membranes, such as the bending angle of the second pole piece 3 is equal in size to the second bending angle between the adjacent sub-membranes, so that when the third sub-piece is attached to two of the adjacent sub-membranes, the fourth sub-piece can be attached to the other two of the adjacent sub-membranes, ensuring the compactness of the cooperation between the sub-membrane 1 and the second pole piece 3.

[0078] Alternatively, the second sub-pole piece formed by connecting the third sub-piece and the fourth sub-piece can be in a U shape, the third sub-piece and the fourth sub-piece form a second arc of the second pole piece 3 at the connection, and the second arc of the second pole piece 3 matches the second angle between the adjacent sub-membranes, such as the second arc of the second pole piece 3 is equal in size to the second angle between the adjacent sub-membranes, so that when the third sub-piece is attached to two of the adjacent sub-membranes, the fourth sub-piece can be attached to the other two of the adjacent sub-membranes, so that the cooperation between the sub-membrane 1 and the second pole piece 3 is more compact.

[0079] In one embodiment, when the battery cell is produced, the sub-membrane 1 is in a Z shape, the first pole piece 2 and the second pole piece 3 are both folded into a V shape, and the first pole piece 2 and the second pole piece 3 are alternately inserted into the bending part of the Z-shaped sub-membrane 1, then the first adapter 4 and the second adapter 5 are respectively inserted through the adapter holes of the first pole piece 2 and the second pole piece 3, so as to connect the plurality of first sub-pole pieces in parallel and the plurality of second sub-pole pieces in parallel, and then the positive and negative tabs are connected to the first adapter 4 and the second adapter 5 respectively to lead out the battery cell, ensuring the integrity of the charging and discharging path of the battery cell and improving the production efficiency of the battery cell.

[0080] In some embodiments, referring to Figure 1 , the first sub-piece is arranged on one side of one sub-membrane away from the other sub-membrane at the first bending angle, and the second sub-piece is arranged on one side of the other sub-membrane away from the one sub-membrane at the first bending angle; and / or,

[0081] The third sub-tab is arranged on one of the two sub-membranes at the second bending corner away from the other sub-membrane, and the fourth sub-tab is arranged on the other of the two sub-membranes at the second bending corner away from the one sub-membrane.

[0082] In this embodiment, among the two sub-membranes forming a first bending corner, the surfaces of the two sub-membranes facing away from each other can be used to arrange the first sub-tab. The first sub-tab is arranged on one of the two sub-membranes away from the other sub-membrane, such as the entire surface of the one sub-membrane away from the other sub-membrane is provided with the first sub-tab. The second sub-tab is arranged on the other of the two sub-membranes away from the one sub-membrane, such as the entire surface of the other sub-membrane away from the one sub-membrane is provided with the second sub-tab. The surfaces of the two sub-membranes facing away from each other can be fully utilized to arrange the first sub-tab, and the area of the first sub-tab 2 can be increased.

[0083] Alternatively, among the two sub-membranes forming a second bending corner, the surfaces of the two sub-membranes facing away from each other can be used to arrange the second sub-tab. The third sub-tab of the second sub-tab is arranged on one of the two sub-membranes away from the other sub-membrane, such as the entire surface of the one sub-membrane away from the other sub-membrane is provided with the third sub-tab. The fourth sub-tab is arranged on the other of the two sub-membranes away from the one sub-membrane, such as the entire surface of the other sub-membrane away from the one sub-membrane is provided with the fourth sub-tab. The surfaces of the two sub-membranes facing away from each other can be fully utilized to arrange the second sub-tab, the area of the second sub-tab 3 can be increased, and the capacity of the battery cell can be increased.

[0084] In some embodiments, referring to Figures 5 to 7 , the first transition site 21 is arranged at the connection between the first sub-tab and the second sub-tab; and / or,

[0085] The second transition site 31 is arranged at the connection between the third sub-tab and the fourth sub-tab.

[0086] In this embodiment, the first sub-tab includes a first current collector 22, the first current collector 22 includes a first bending area and first coating areas on both sides of the first bending area. The first sub-tab corresponds to part of the first bending area and the first coating area on one side of the first bending area. The second sub-tab corresponds to the remaining part of the first bending area and the first coating area on the other side of the first bending area. The first bending area forms the connection between the first sub-tab and the second sub-tab. The first transition site 21 is arranged at the first bending area. The first coating area is used to coat the first active material, and the first bending area is a separate current collector and does not need to be coated with the first active material. The first sub-tab can be bent at the connection between the first sub-tab and the second sub-tab, and the effectiveness of the connection between the first transition site 21 and the first sub-tab through the first transition site 4 is ensured.

[0087] In a specific embodiment, referring toFigure 6 The length of the first coating region is L1, and one side surface or both side surfaces of the first coating region are coated with the first active material, so as to flexibly adjust the amount of the active material coated on the first sub-pole piece.

[0088] In this embodiment, the second sub-pole piece includes a second current collector 32, the second current collector 32 includes a second bending region and second coating regions located on both sides of the second bending region, the third sub-piece corresponds to include part of the second bending region and the second coating region on one side of the second bending region, the fourth sub-piece corresponds to include the remaining part of the second bending region and the second coating region on the other side of the second bending region, the second bending region forms the connection between the third sub-piece and the fourth sub-piece, the second adapter site 31 is arranged at the second bending region, and the second coating region is used to coat the second active material, and the second bending region is a separate current collector and does not need to be coated with the second active material, so as to facilitate the bending of the second sub-pole piece at the connection between the third sub-piece and the fourth sub-piece, and ensure the effectiveness of the connection between the second adapter 5 and the second sub-pole piece through the second adapter site 31.

[0089] In a specific embodiment, referring to Figure 6 The length of the connection between the adjacent sub-membranes is L2, the length of the second coating region is L3, and one side surface or both side surfaces of the second coating region are coated with the second active material, so as to flexibly adjust the amount of the active material coated on the second sub-pole piece.

[0090] In some embodiments, referring to Figure 1 The first bending angle and the second bending angle are located on opposite sides of the width direction of the battery cell and are arranged on the membrane 1 in a spaced manner.

[0091] In this embodiment, the membrane 1 extends in the length direction of the battery cell, the width direction of the battery cell is perpendicular to the length direction of the battery cell, for example The up-down direction in Figure 1 is the length direction of the battery cell, The left-right direction in Figure 1 is the width direction of the battery cell, the first bending angle and the second bending angle are located on opposite sides of the width direction of the battery cell and avoid the membrane 1, so that the connection between the first sub-piece and the second sub-piece and the connection between the third sub-piece and the fourth sub-piece can be away from each other, avoiding the contact short circuit between the first adapter 4 and the second adapter 5.

[0092] At the same time, the first bending angle and the second bending angle are arranged on the membrane 1 in a spaced manner, for example, in the extension direction of the membrane 1, the bending positions of the membrane 1 are arranged in the order of the first bending angle, the second bending angle, the first bending angle and the second bending angle, which are arranged in the order of overlapping each other, so as to balance the first sub-pole piece and the second sub-pole piece on both sides of the membrane 1, and ensure the balance of the positive and negative poles of the battery cell.

[0093] In an embodiment, referring to Figure 2 ,Figure 3 and Figure 5 The battery cell further comprises a first tab 6 and a second tab 7, the first adapter 4 is connected to the outside of the battery cell through the first tab 6, and the second adapter 5 is connected to the outside of the battery cell through the second tab 7.

[0094] In this embodiment, the first adapter 4 is connected to the outside of the battery cell through the first tab 6 while sequentially connecting a plurality of first adapter positions 21 on the first tab 2, and the second adapter 5 is connected to the outside of the battery cell through the second tab 7 while sequentially connecting a plurality of second adapter positions 31 on the second tab 3, so as to connect the battery cell with an external charging component or a component to be charged, and realize charging or discharging of the battery cell.

[0095] In some embodiments, referring to Figure 4 The battery cell further comprises a packaging body 8, the diaphragm 1, the first tab 2 and the second tab 3 form a battery cell main body, and the packaging body 8 covers the battery cell main body.

[0096] In the length direction of the battery cell, a reserved gap is provided between the packaging body 8 and the battery cell main body.

[0097] In this embodiment, the packaging body 8 can be a steel shell or an aluminum plastic film packaging structure, and the volume of the first tab 2 and the second tab 3 will expand during the charging and discharging process of the battery cell, especially in the length direction of the battery cell. The present embodiment provides a reserved gap between the packaging body 8 and the battery cell main body in the length direction of the battery cell, and the reserved gap forms a reserved expansion amount of the battery cell main body in the length direction of the battery cell, preventing the steel shell from excessively compressing the battery cell main body or preventing the aluminum plastic film from being broken by the battery cell main body, and ensuring the stability of the battery cell structure.

[0098] In some embodiments, referring to Figure 1 The battery cell further comprises a fastening belt 9, the fastening belt 9 surrounds the first tab 2 and the second tab 3 in the width direction of the battery cell, and fastens the first tab 2 and the second tab 3 in the length direction of the battery cell.

[0099] In this embodiment, the fastening belt 9 can be an insulating belt formed of an insulating material and having a certain tensile property, such as an insulating adhesive tape or an insulating cloth, the width direction of the battery cell can be the left-right direction in Figure 1 , and the length direction of the battery cell can be the up-down direction in Figure 1The fastening belt 9 is sleeved on the first pole piece 2 and the second pole piece 3 in the width direction of the battery cell, so as to prevent the first pole piece 2 and the second pole piece 3 from being scattered, and ensure the compactness of the first pole piece 2 and the second pole piece 3; meanwhile, the fastening belt 9 is connected to the side edges of the first pole piece 2 and the second pole piece 3 in the length direction of the battery cell, so as to limit the first pole piece 2 and the second pole piece 3 in the length direction of the battery cell; when the battery cell body expands, the fastening belt 9 can be elongated together with the first pole piece 2 and the second pole piece 3, so as to ensure the stability of the battery cell structure.

[0100] The application provides a kind of power utilization equipment, which includes the battery cell described above.

[0101] In this embodiment, the battery cell of the power utilization equipment is bent and extended in the length direction of the battery cell through the diaphragm 1, so as to simultaneously arrange the pole pieces on both sides of the bent diaphragm, improve the assembly efficiency between the diaphragm and the pole pieces in the battery cell, and improve the endurance of the power utilization equipment.

[0102] It can be understood that the electronic device can be a mobile phone, a tablet, a computer, or a vehicle, etc.

[0103] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An electric cell, characterized by, The application relates to an electric core, comprising: a diaphragm, which is bent and extended in the length direction of the electric core, the length direction of the electric core having an expansion allowance; a first pole piece arranged on one side surface of the diaphragm and having a plurality of first adapter positions arranged at intervals; a second pole piece arranged on the other side surface of the diaphragm and having a plurality of second adapter positions arranged at intervals, the second pole piece being opposite in polarity to the first pole piece; a first adapter sequentially connected to the plurality of first adapter positions and a second adapter sequentially connected to the plurality of second adapter positions, and the first adapter and the second adapter forming two external ports of the electric core.

2. The electric cell of claim 1, wherein, The diaphragm comprises a plurality of sub-diaphragms connected integrally, and a bending included angle is formed between adjacent sub-diaphragms; or adjacent sub-diaphragms are connected in an arc shape.

3. The electric cell of claim 2, wherein, A plurality of bending positions of the diaphragm form a plurality of bending included angles, and the included angles of the plurality of bending included angles are equal; or a plurality of bending positions of the diaphragm form a plurality of radian angles, and the radian sizes of the plurality of radian angles are equal.

4. The electric cell of claim 2, wherein, The first pole piece comprises a plurality of first sub-pole pieces, each of the first sub-pole pieces comprising a first sub-piece and a second sub-piece connected integrally; a bending included angle of the first pole piece is formed between the first sub-piece and the second sub-piece, and the bending included angle of the first pole piece matches a first bending included angle between the sub-diaphragms; or the first sub-piece and the second sub-piece are connected in a first radian, and the first radian matches a first radian angle between adjacent sub-diaphragms; and / or The second pole piece comprises a plurality of second sub-pole pieces, each of the second sub-pole pieces comprising a third sub-piece and a fourth sub-piece connected integrally; a bending included angle of the second pole piece is formed between the third sub-piece and the fourth sub-piece, and the bending included angle of the second pole piece matches a second bending included angle between the sub-diaphragms; or the third sub-piece and the fourth sub-piece are connected in a second radian, and the second radian matches a second radian angle between adjacent sub-diaphragms.

5. The electric core according to claim 4, wherein the first sub-piece is arranged on one side of one sub-diaphragm away from the other sub-diaphragm at the first bending included angle, and the second sub-piece is arranged on the other side of the other sub-diaphragm away from the one sub-diaphragm at the first bending included angle; and / or the third sub-piece is arranged on one side of one sub-diaphragm away from the other sub-diaphragm at the second bending included angle, and the fourth sub-piece is arranged on the other side of the other sub-diaphragm away from the one sub-diaphragm at the second bending included angle.

6. The electric cell of claim 4, wherein, the first adapter position is arranged at the connection between the first sub-piece and the second sub-piece; and / or the second adapter position is arranged at the connection between the third sub-piece and the fourth sub-piece.

7. The electric cell of claim 4, wherein, the first bending included angle and the second bending included angle are arranged on opposite sides of the electric core in the width direction and are arranged at intervals on the diaphragm.

8. The electric cell of claim 1, wherein, The application further relates to an encapsulation body, the diaphragm, the first pole piece and the second pole piece forming an electric core main body, and the encapsulation body encapsulating the electric core main body. A reserved gap is provided between the package and the cell body in the length direction of the cell.

9. The electric cell of claim 1, wherein, A fastening tape is further included, which surrounds the first and second tab pieces in the width direction of the cell and fastens the first and second tab pieces in the length direction of the cell.

10. An electric device, characterized by An electric cell including the electric cell according to any one of claims 1 to 9.

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