Battery cell and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery, the battery cell comprises a main body, a first conductive piece and a second conductive piece, the main body is formed by winding a first pole piece and a second pole piece, and the main body is provided with a first surface and a second surface opposite to each other along the thickness direction, and a middle layer; the first conductive piece is formed by stacking and connecting a plurality of first false tabs connected to the first pole piece; the second conductive piece is formed by stacking and connecting a plurality of second false tabs connected to the first pole piece; wherein the first conductive part is located between the middle layer and the first surface and is bent towards one side of the second surface; the second conductive part is located between the middle layer and the second surface and is bent towards one side of the first surface; the bent first conductive part and the bent second conductive part are both located between the first surface and the second surface, so that the space occupied by the first conductive part and the second conductive part in the shell of the battery can be reduced, and the energy density of the battery is improved.

Description

Technical Field

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

[0002] Soft-pack lithium-ion batteries are widely used in various digital products and mobile devices. Some battery cells use fake tabs to increase the charging speed. When the battery cells are installed in the battery shell, the battery cells occupy more space in the shell, affecting the energy density of the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell that can improve the energy density of the battery.

[0004] According to the battery cell of the first aspect embodiment of the utility model, the battery cell includes a main body, a first conductive member and a second conductive member, the main body is formed by winding a first pole piece and a second pole piece, the main body has a first surface and a second surface opposite to each other along the thickness direction, and the main body also has an intermediate layer located between the first surface and the second surface; the first conductive member is formed by stacking and connecting a plurality of first pseudo pole tabs, and the plurality of first pseudo pole tabs are connected to the first pole piece; the second conductive member is formed by stacking and connecting a plurality of second pseudo pole tabs, and the plurality of second pseudo pole tabs are connected to the first pole piece; wherein the first conductive member is located between the intermediate layer and the first surface, and is bent to one side of the second surface; the second conductive member is located between the intermediate layer and the second surface, and is bent to one side of the first surface; the bent first conductive member and the bent second conductive member are both located between the first surface and the second surface.

[0005] The battery cell according to the embodiment of the utility model has at least the following beneficial effects: the first conductive member is formed by a plurality of first pseudo-pole tabs connected to the first pole piece, and the second conductive member is formed by a plurality of second pseudo-pole tabs connected to the first pole piece, and the first conductive member and the second conductive member can improve the current distribution, and improve the cycle life and safety of the battery. The first conductive member is located between the middle layer and the first surface of the main body, and is bent toward one side of the second surface, and the second conductive member is located between the middle layer and the second surface of the main body, and is bent toward one side of the first surface. In this way, when the battery cell is assembled in the battery shell, the length of the bent first conductive member and the bent second conductive member is shortened, and the space occupied by the first conductive member and the second conductive member in the battery shell can be reduced, so that a larger-sized main body can be accommodated in the battery shell, which helps to improve the energy density of the battery. The bent first conductive member and the bent second conductive member are both located between the first surface and the second surface. In this way, the bent first conductive member and the bent second conductive member can be controlled at the end surface of the main body without crossing the first surface and the second surface in the thickness direction, which helps to avoid the bent first conductive member and the bent second conductive member affecting the thickness dimension of the battery cell.

[0006] According to some embodiments of the utility model, the battery cell also includes a first pole ear and a second pole ear, the first pole ear is connected to the first pole piece, and the second pole ear is connected to the second pole piece; the main body has a first end and a second end opposite to each other, the first pole ear and the second pole ear are both protruding from the first end, and the first conductive member and the second conductive member are both protruding from the first end or the second end.

[0007] According to some embodiments of the present invention, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

[0008] According to some embodiments of the present invention, the first pole piece includes a plurality of first segments and a plurality of second segments alternately connected, and each first segment is respectively connected to a first pseudo pole lug; the first segments and the second segments are alternately distributed in sequence along the winding direction of the first pole piece, and the plurality of first pseudo pole lugs overlap along the thickness direction.

[0009] According to some embodiments of the present invention, each second segment is respectively connected to a second dummy electrode tab, and a plurality of second dummy electrode tabs overlap along the thickness direction.

[0010] According to some embodiments of the present invention, the first pole piece includes a first empty foil area, a first current collecting area, and a second empty foil area connected in sequence, and the plurality of first dummy pole tabs are all connected to the first current collecting area.

[0011] According to some embodiments of the present invention, the second pole piece includes a third empty foil area, a second current collecting area and a fourth empty foil area which are connected in sequence, and the plurality of second dummy pole tabs are all connected to the second current collecting area.

[0012] According to some embodiments of the utility model, the first pole piece includes a first empty foil area, a first current collecting area, and a second empty foil area connected in sequence, and at least one of the first empty foil area, the first current collecting area, and the second empty foil area is connected to at least one first pole lug; the second pole piece includes a third empty foil area, a second current collecting area, and a fourth empty foil area connected in sequence, and at least one of the third empty foil area, the second current collecting area, and the fourth empty foil area is connected to at least one second pole lug.

[0013] According to some embodiments of the present invention, the first conductive member is bonded to the main body, and / or the second conductive member is bonded to the main body.

[0014] According to the battery of the second embodiment of the utility model, the battery includes the battery cell in any one of the above embodiments.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 A schematic structural diagram of a battery cell provided in an embodiment of the utility model is shown.

[0018] Figure 2 A schematic structural diagram of the bending of the first conductive member and the second conductive member provided in an embodiment of the utility model is shown.

[0019] Figure 3 A schematic structural diagram of a first pole piece, a first dummy pole tab and a first pole tab provided in an embodiment of the utility model is shown.

[0020] Figure 4 A schematic structural diagram of a second pole piece, a second dummy pole tab and a second pole tab provided in an embodiment of the utility model is shown.

[0021] Reference numerals:

[0022] Battery cell 100;

[0023] Main body 110; first surface 113; second surface 114; intermediate layer 115; first end 116; second end 117;

[0024] First pole piece 111; first section 1111; second section 1112; first empty foil area 1113; first current collecting area 1114; second empty foil area 1115;

[0025] The second pole piece 112; the third empty foil area 1121; the second current collecting area 1122; the fourth empty foil area 1123;

[0026] A first conductive member 120; a first dummy electrode tab 121;

[0027] A second conductive member 130; a second dummy electrode tab 131;

[0028] A first electrode tab 140 and a second electrode tab 150 . DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments 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.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] In the description of the utility model, 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0034] See also Figure 1An embodiment of the present application provides a battery, which includes a shell and a battery cell 100. The battery cell 100 can be arranged in the shell, and an electrolyte can be injected into the shell to form a battery.

[0035] See also Figures 1 to 4 In some embodiments, the battery cell 100 includes a main body 110 , a first conductive member 120 , and a second conductive member 130 .

[0036] Among them, Figure 3 and Figure 4 As shown, the main body 110 is formed by winding the first pole piece 111 and the second pole piece 112. For example, the main body 110 may also include a diaphragm for separating the first pole piece 111 and the second pole piece 112, and the first pole piece 111, the diaphragm and the second pole piece 112 may be stacked in sequence and then wound.

[0037] like Figure 1 and Figure 2 As shown, the main body 110 has a first surface 113 and a second surface 114 opposite to each other along the thickness direction, and the main body 110 further has an intermediate layer 115 located between the first surface 113 and the second surface 114 .

[0038] The middle layer 115 may refer to the innermost layer after the first pole piece 111 or the second pole piece 112 is wound. For example, the middle layer 115 may refer to the innermost layer of the first pole piece 111 after winding, or the middle layer 115 may refer to the innermost layer of the second pole piece 112 after winding. The distinction can be made based on actual conditions.

[0039] like Figure 2 and Figure 3 As shown, the first conductive member 120 is formed by stacking and connecting a plurality of first pseudo-pole tabs 121, and the plurality of first pseudo-pole tabs 121 are connected to the first pole piece 111. The first conductive member 120 formed by connecting a plurality of first pseudo-pole tabs 121 can improve the current distribution, help to evenly distribute the current, reduce the local overheating or overcharging in the battery cell 100, improve the cycle life of the battery, and improve the safety of the battery. For example, the first conductive member 120 can be formed by stacking and welding a plurality of first pseudo-pole tabs 121.

[0040] The second conductive member 130 is formed by stacking and connecting a plurality of second pseudo-electrode tabs 131, and the plurality of second pseudo-electrode tabs 131 are connected to the first pole piece 111. The first conductive member 120 and the second conductive member 130 cooperate to further improve the current distribution, and further improve the cycle life and safety of the battery. For example, the second conductive member 130 can be formed by stacking and welding a plurality of second pseudo-electrode tabs 131.

[0041] The first conductive member 120 is located between the middle layer 115 and the first surface 113 and is bent toward one side of the second surface 114. The second conductive member 130 is located between the middle layer 115 and the second surface 114 and is bent toward one side of the first surface 113. Thus, when the battery cell 100 is assembled in the battery housing, the length of the bent first conductive member 120 and the length of the bent second conductive member 130 are shortened, which helps to increase the size of the main body 110 and reduce the space occupied by the first conductive member 120 and the second conductive member 130 in the battery housing, so that the battery housing can accommodate a larger main body 110, which helps to improve the energy density of the battery. In addition, since the plurality of first false tabs 121 are only arranged between the middle layer 115 and the first surface 113, there can be enough space between the middle layer 115 and the second surface 114 so that the first conductive member 120 can be bent. Similarly, since the plurality of second dummy tabs 131 are only disposed between the middle layer 115 and the second surface 114 , there is enough space between the middle layer 115 and the first surface 113 so that the first conductive member 120 can be bent.

[0042] The first conductive element 120 being bent toward one side of the second surface 114 may mean that one side of the second surface 114 of the first conductive element 120 is bent and is in a bent state.

[0043] The second conductive member 130 being bent toward one side of the first surface 113 may mean that the first conductive member 120 is bent toward one side of the first surface 113 and is in a bent state.

[0044] The first conductive member 120 may refer to a first conductive member 120 formed by connecting a plurality of first dummy pole tabs 121 of the first pole piece 111 between the middle layer 115 and the first surface 113 after the first pole piece 111 and the second pole piece 112 are wound. It should be noted that, for the first pole piece 111 located between the middle layer 115 and the first surface 113, each layer of the first pole piece 111 may be connected to the first dummy pole tab 121, or part of the layers of the first pole piece 111 may be connected to the first dummy pole tab 121.

[0045] Similarly, the second conductive member 130 may refer to that, after the first pole piece 111 and the second pole piece 112 are wound, the second conductive member 130 is formed by connecting a plurality of second dummy pole tabs 131 of the first pole piece 111 connected between the middle layer 115 and the second surface 114. It should be noted that, for the first pole piece 111 located between the middle layer 115 and the second surface 114, each layer of the first pole piece 111 may be connected to the second dummy pole tab 131, or part of the layers of the first pole piece 111 may be connected to the second dummy pole tab 131.

[0046] The bent first conductive member 120 is located between the first surface 113 and the second surface 114, and the bent second conductive member 130 is located between the first surface 113 and the second surface 114. In this way, the bent first conductive member 120 and the bent second conductive member 130 can be controlled at the end surface of the main body 110 without crossing the first surface 113 and the second surface 114 in the thickness direction, which helps to avoid the bent first conductive member 120 and the bent second conductive member 130 affecting the thickness dimension of the battery cell 100.

[0047] See also Figure 2 In some embodiments, when the first conductive member 120 does not extend beyond the second surface 114 after being bent, the lengths of the plurality of first pseudo-electrode tabs 121 may be equal or unequal. Similarly, when the second conductive member 130 does not extend beyond the first surface 113 after being bent, the lengths of the plurality of second pseudo-electrode tabs 131 may be equal or unequal.

[0048] In some embodiments, after the first pole piece 111 and the second pole piece 112 are wound to form the main body 110, the lengths of the plurality of first pseudo-pole ears 121 can be gradually shortened along the first surface 113 toward the middle layer 115, and the length of the longest pseudo-pole ear among the plurality of first pseudo-pole ears 121 can be less than or equal to the thickness of the main body 110, so that the first conductive member 120 can be bent without exceeding the second surface 114.

[0049] Similarly, after the first pole piece 111 and the second pole piece 112 are wound to form the main body 110, the lengths of the plurality of second pseudo-pole ears 131 can be gradually shortened along the second surface 114 toward the middle layer 115, and the length of the longest pseudo-pole ear among the plurality of second pseudo-pole ears 131 can be less than or equal to the thickness of the main body 110, so that the first conductive member 120 can be bent without exceeding the second surface 114.

[0050] The thickness of the main body 110 may refer to the thickness of the main body 110 in the direction from the first surface 113 to the second surface 114 .

[0051] See also Figure 1 , Figure 3 and Figure 4 In some embodiments, the battery cell 100 may further include a first pole ear 140 and a second pole ear 150. The first pole ear 140 may be connected to the first pole piece 111, and the second pole ear 150 may be connected to the second pole piece 112. The first pole ear 140 and the second pole ear 150 may interact with the outside world for charging and discharging.

[0052] In some embodiments, the first electrode sheet 111 may be a negative electrode sheet, and the second electrode sheet 112 may be a positive electrode sheet. Thus, a plurality of first dummy pole tabs 121 and a plurality of second dummy pole tabs 131 are provided on the first electrode sheet 111, which helps to improve the charging speed of the battery. It can be understood that the first pole tab 140 may be a negative pole tab, and the second pole tab 150 may be a positive pole tab.

[0053] See also Figure 1 In some embodiments, the main body 110 may have a first end 116 and a second end 117 relative to each other, the first pole ear 140 and the second pole ear 150 are both protruding from the first end 116, and the first conductive member 120 and the second conductive member 130 are both protruding from the second end 117. In this way, compared with the pole ears (the first pole ear 140 and the second pole ear 150) and the conductive members (the first conductive member 120 and the second conductive member 130) being located at the same end of the main body 110, this embodiment respectively arranges the pole ears and the conductive members at both ends of the main body 110, which helps to reduce the difficulty of manufacturing the battery shell and also helps to make the battery cell 100 easier to install into the battery shell.

[0054] The first conductive member 120 and the second conductive member 130 may also protrude from the first end 117 , that is, the first pole ear 140 , the second pole ear 150 , the first conductive member 120 and the second conductive member 130 may all protrude from the first end 116 , thereby shortening the distance between the pole ear and the conductive member, and helping to improve the shunting effect of the first conductive member 120 and the second conductive member 130 .

[0055] The direction from the first end 116 to the second end 117 is substantially the length direction of the battery cell 100 .

[0056] See also Figure 1 and Figure 3 In some embodiments, the first pole piece 111 may include a plurality of first segments 1111 and a plurality of second segments 1112 connected alternately, each first segment 1111 is connected to a first pseudo pole lug 121, the first segment 1111 and the second segment 1112 may be alternately distributed in sequence along the winding direction of the first pole piece 111, and the plurality of first pseudo pole lugs 121 overlap along the thickness direction, so that the plurality of first pseudo pole lugs 121 may be controlled between the middle layer 115 and the first surface 113, and the plurality of first pseudo pole lugs 121 are connected to form a first conductive member 120, and the first conductive member 120 may be bent toward the second surface 114, and the bent first conductive member 120 may not exceed the second surface 114. The thickness direction may refer to the thickness direction of the body 110.

[0057] In some embodiments, each second segment 1112 is respectively connected to a second pseudo-pole ear 131. When the first pole piece 111 and the second pole piece 112 are wound, multiple second pseudo-pole ears 131 overlap in the thickness direction. In this way, the multiple second pseudo-pole ears 131 can be controlled between the middle layer 115 and the second surface 114. After connecting the multiple second pseudo-pole ears 131, a second conductive member 130 is formed. The second conductive member 130 can be bent toward the side of the first surface 113, and the bent second conductive member 130 may not exceed the second surface 114.

[0058] Furthermore, since the first pseudo-electrode tab 121 is connected to the first section 1111, the second pseudo-electrode tab 131 is connected to the second section 1112, and the first section 1111 and the second section 1112 are alternately distributed, the first pseudo-electrode tab 121 and the second pseudo-electrode tab 131 do not overlap in the thickness direction of the battery cell 100, that is, the first conductive member 120 and the second conductive member 130 can be distributed along the width direction of the battery cell 100. The width of the battery cell 100 is approximately Figure 1 In the direction from the first conductive member 120 to the second conductive member 130.

[0059] In some embodiments, the first pole tab 140 or the second pole tab 150 and a first dummy pole tab 121 may be located in the same first section 1111 , thereby shortening the distance between the first pole tab 140 or the second pole tab 150 and the first conductive member 120 , and helping to improve the shunting effect of the first conductive member 120 .

[0060] Similarly, the first pole tab 140 or the second pole tab 150 and a second dummy pole tab 121 may be located in the same second section 1112 , thereby shortening the distance between the first pole tab 140 or the second pole tab 150 and the second conductive member 130 to enhance the shunting effect of the second conductive member 130 .

[0061] In some embodiments, the first pole piece 111 may include a first empty foil area 1113 , a first current collecting area 1114 , and a second empty foil area 1115 connected in sequence, and a plurality of first dummy pole tabs 121 are all connected to the first current collecting area 1114 to improve the uniform current distribution performance of the first conductive member 120 .

[0062] Among them, the first current collecting area 1114 may refer to the area on the first pole piece 111 coated with the active coating, the first empty foil area 1113 and the second empty foil area 1115 may be respectively located on the opposite sides of the first current collecting area 1114, and the first empty foil area 1113 and the second empty foil area 1115 may refer to the area on the first pole piece 111 not coated with the active coating.

[0063] It can be understood that the first current collecting area 1114 may include a plurality of first segments 1111 and a plurality of second segments 1112 alternately connected in the above embodiment.

[0064] In some embodiments, at least one of the first empty foil area 1113, the first current collecting area 1114, and the second empty foil area 1115 is connected to at least one first pole ear 140. In this way, the first pole ear 140 can be arranged in a variety of ways, and the number of the first pole ears 140 can be one or more. When the number of the first pole ears 140 is multiple, the multiple first pole ears 140 can further improve the current distribution, help to evenly distribute the current, reduce local overheating or overcharging in the battery cell 100, increase the cycle life of the battery, and improve the safety of the battery.

[0065] Specifically, at least one of the first empty foil area 1113, the first current collecting area 1114, and the second empty foil area 1115 is connected to the first pole tab 140, and each of the first empty foil area 1113, the first current collecting area 1114, and the second empty foil area 1115 may be connected to one or more first pole tabs 140. Here, "multiple" may refer to two or more.

[0066] As an example, the first empty foil area 1113 may be connected to one or more first pole tabs 140 , the first current collecting area 1114 may be connected to one or more first pole tabs 140 , and the second empty foil area 1115 may be connected to one or more first pole tabs 140 .

[0067] As another example, the first empty foil area 1113 may be connected to one or more first pole tabs 140 , the first current collecting area 1114 may be connected to one or more first pole tabs 140 , and the second empty foil area 1115 may not be provided with a first pole tab 140 .

[0068] As another example, the first empty foil area 1113 may be connected to one or more first pole tabs 140 , the first current collecting area 1114 may not be provided with a first pole tab 140 , and the second empty foil area 1115 may be connected to one or more first pole tabs 140 .

[0069] As another example, the first empty foil area 1113 may not be provided with the first electrode tab 140 , the first current collecting area 1114 may be connected to one or more first electrode tabs 140 , and the second empty foil area 1115 may be connected to one or more first electrode tabs 140 .

[0070] As another example, the first empty foil area 1113 may be connected to one or more first pole tabs 140 , the first current collecting area 1114 may not be provided with a first pole tab 140 , and the second empty foil area 1115 may not be provided with a first pole tab 140 .

[0071] Alternatively, the first electrode tab 140 may also be arranged in other ways on a hollow foil area 1113 , a first current collecting area 1114 , and a second hollow foil area 1115 , which will not be described in detail.

[0072] See also Figure 1 and Figure 4 In some embodiments, the second pole piece 112 may include a third empty foil area 1121, a second current collecting area 1122 and a fourth empty foil area 1123 connected in sequence, and a plurality of second dummy pole ears 131 are all connected to the second current collecting area 1122 to improve the performance of uniform current distribution of the second conductive member 130.

[0073] Among them, the second current collecting area 1122 may refer to the area on the second pole piece 112 coated with the active coating, the third empty foil area 1121 and the fourth empty foil area 1123 may be respectively located on the opposite sides of the second current collecting area 1122, and the third empty foil area 1121 and the fourth empty foil area 1123 may refer to the area on the first pole piece 111 not coated with the active coating.

[0074] In some embodiments, the second pole piece 112 includes a third empty foil area 1121, a second current collecting area 1122 and a fourth empty foil area 1123 connected in sequence, and at least one of the third empty foil area 1121, the second current collecting area 1122 and the fourth empty foil area 1123 is connected to at least one second pole ear 150. In this way, the second pole ear 150 can be arranged in a variety of ways, and the number of second pole ears 150 can be one or more. When the number of second pole ears 150 is multiple, multiple second pole ears 150 can improve the current distribution, help to evenly distribute the current, reduce local overheating or overcharging in the battery cell 100, improve the cycle life of the battery, and improve the safety of the battery.

[0075] Specifically, at least one of the third empty foil area 1121, the second current collecting area 1122, and the fourth empty foil area 1123 is connected to the second electrode tab 150, and each of the third empty foil area 1121, the second current collecting area 1122, and the fourth empty foil area 1123 may be connected to one or more second electrode tabs 150. Here, "multiple" may refer to two or more.

[0076] The arrangement of the second electrode tab 150 in the third empty foil area 1121 , the second current collecting area 1122 and the fourth empty foil area 1123 can refer to the arrangement of the first electrode tab 140 in the first empty foil area 1113 , the first current collecting area 1114 and the second empty foil area 1115 , which will not be repeated here.

[0077] In some embodiments, the first conductive member 120 may be bonded to the main body 110 , which helps keep the first conductive member 120 in a bent state and reduces rebound of the first conductive member 120 after bending, thereby making it easier to install the battery cell 100 in the battery housing.

[0078] As an example, the first conductive member 120 may be bonded to the main body 110 by adhesive tape. For example, the adhesive tape may be wrapped around the outer surface of the bent first conductive member 120 so as to be bonded to the main body 110 by the adhesive tape.

[0079] As another example, an adhesive layer may be provided on the surface of the first conductive member 120. When the first conductive member 120 is bent, the first conductive member 120 may be bonded to the main body 110 through the adhesive layer, wherein the adhesive layer may be insulating glue or insulating double-sided tape.

[0080] Alternatively, the first conductive member 120 may also be bonded or connected to the main body 110 in other ways.

[0081] See also Figure 1 In some embodiments, the second conductive member 130 is bonded to the main body 110, which helps the second conductive member 130 to remain in a bent state and reduces the rebound of the second conductive member 130 after bending, so that the battery cell 100 can be more conveniently installed in the battery housing.

[0082] The bonding method between the second conductive member 130 and the main body 110 may refer to the bonding method between the first conductive member 120 and the main body 110 , and will not be described in detail herein.

[0083] In the battery cell 100 and the battery provided in the embodiment of the present application, the first conductive member 120 is formed by a plurality of first pseudo-pole ears 121 connected to the first pole piece 111 and stacked together, and the second conductive member 130 is formed by a plurality of second pseudo-pole ears 131 connected to the first pole piece 111 and stacked together. The first conductive member 120 and the second conductive member 130 can improve the current distribution and increase the cycle life and safety of the battery. The first conductive member 120 is located between the middle layer 115 and the first surface 113 of the main body 110, and is bent toward one side of the second surface 114. The second conductive member 130 is located between the middle layer 115 and the second surface 114 of the main body 110, and is bent toward one side of the first surface 113. In this way, when the battery cell 100 is assembled in the battery shell, the lengths of the bent first conductive member 120 and the bent second conductive member 130 are shortened, so that the space occupied by the first conductive member 120 and the second conductive member 130 in the battery shell can be reduced, so that a larger main body 110 can be accommodated in the battery shell, which helps to improve the energy density of the battery. The bent first conductive member 120 and the bent second conductive member are both located between the first surface 113 and the second surface 114. In this way, the bent first conductive member 120 and the bent second conductive member 130 can be controlled at the end surface of the main body 110 without crossing the first surface 113 and the second surface 114 in the thickness direction, which helps to avoid the bent first conductive member 120 and the bent second conductive member 130 affecting the thickness dimension of the battery cell 100.

[0084] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery cell, characterized in that: include: A main body, formed by winding a first pole piece and a second pole piece, the main body having a first surface and a second surface opposite to each other in a thickness direction, and the main body further having an intermediate layer located between the first surface and the second surface; A first conductive member is formed by stacking and connecting a plurality of first pseudo-electrode tabs, wherein the plurality of first pseudo-electrode tabs are connected to the first pole piece; as well as A second conductive member is formed by stacking and connecting a plurality of second pseudo-electrode tabs, wherein the plurality of second pseudo-electrode tabs are connected to the first pole piece; Wherein, the first conductive member is located between the middle layer and the first surface, and is bent toward one side of the second surface; the second conductive member is located between the middle layer and the second surface, and is bent toward one side of the first surface; The bent first conductive member and the bent second conductive member are both located between the first surface and the second surface.

2. The battery cell according to claim 1, characterized in that: The battery cell further comprises a first pole ear and a second pole ear, wherein the first pole ear is connected to the first pole piece, and the second pole ear is connected to the second pole piece; The main body has a first end and a second end opposite to each other, the first pole lug and the second pole lug are both protruding from the first end, and the first conductive member and the second conductive member are both protruding from the first end or the second end.

3. The battery cell according to claim 1, characterized in that: The first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

4. The battery cell according to claim 1, characterized in that: The first pole piece includes a plurality of first segments and a plurality of second segments that are alternately connected, and each of the first segments is respectively connected to a first dummy pole lug; The first sections and the second sections are alternately distributed in sequence along the winding direction of the first pole piece, and a plurality of the first dummy pole tabs overlap along the thickness direction.

5. The battery cell according to claim 4, characterized in that: Each of the second sections is connected to a second dummy electrode tab, and a plurality of the second dummy electrode tabs overlap along the thickness direction.

6. The battery cell according to claim 1, characterized in that: The first pole piece includes a first empty foil area, a first current collecting area, and a second empty foil area which are connected in sequence, and a plurality of the first dummy pole tabs are all connected to the first current collecting area.

7. The battery cell according to claim 1, characterized in that: The second pole piece includes a third empty foil area, a second current collecting area and a fourth empty foil area which are connected in sequence, and a plurality of the second dummy pole tabs are all connected to the second current collecting area.

8. The battery cell according to claim 2, characterized in that: The first pole piece comprises a first empty foil area, a first current collecting area and a second empty foil area connected in sequence, and at least one of the first empty foil area, the first current collecting area and the second empty foil area is connected to at least one of the first pole lugs; The second pole piece includes a third empty foil area, a second current collecting area and a fourth empty foil area which are connected in sequence, and at least one of the third empty foil area, the second current collecting area and the fourth empty foil area is connected to at least one of the second pole lugs.

9. The battery cell according to claim 1, characterized in that: The first conductive member is bonded to the main body, and / or the second conductive member is bonded to the main body.

10. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 9.

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