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 battery cell main body, a composite tab, an outer seal, a conductive piece and a support piece, the composite tab is connected to one side of the battery cell main body and is formed by superposing a plurality of false tabs; a first accommodating space and a second accommodating space which are communicated with each other are arranged in the outer seal, the battery cell main body is positioned in the first accommodating space, and the composite tab is positioned in the second accommodating space; the conductive part is partially inserted into the second accommodating space and is electrically connected to the composite tab; and the supporting piece is positioned in the second accommodating space, is connected to the composite tab and / or the conductive piece, and is used for expanding after absorbing the electrolyte to support the outer seal, so that the problem that the outer seal is easy to sink can be improved.

Description

Technical Field

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

[0002] In multi-tab cells, the composite tabs formed by stacking multiple tabs typically require transfer welding with TAB. For multi-tab cells where the composite tabs are directly encapsulated in aluminum-plastic film, the film is prone to denting near the end of the composite tab, which can adversely affect the appearance and performance of the cell. Utility Model Content

[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 improve the problem that the outer seal is easily dented.

[0004] According to the battery cell of the first aspect embodiment of the present invention, the battery cell includes a battery cell body, a composite electrode tab, an outer seal, a conductive member and a support member, the composite electrode tab is connected to one side of the battery cell body and is formed by stacking multiple false electrodes; a first accommodating space and a second accommodating space that are connected are provided in the outer seal, the battery cell body is located in the first accommodating space, and the composite electrode tab is located in the second accommodating space; the conductive member is partially inserted in the second accommodating space and is electrically connected to the composite electrode tab; the support member is located in the second accommodating space and is connected to the composite electrode tab and / or the conductive member, and is used to expand after absorbing electrolyte to support the outer seal.

[0005] The battery cell according to the embodiment of the present invention has at least the following beneficial effects: a first accommodating space and a second accommodating space are provided in the outer seal, and the battery cell body is located in the first accommodating space; the composite tab is connected to one side of the battery cell body and is located in the second accommodating space; the conductive part is partially inserted in the second accommodating space and electrically connected to the composite tab, and the electrolyte can enter the first accommodating space and the second accommodating space. The support member is located in the second accommodating space and is connected to the composite tab and / or the conductive member. The support member can expand after absorbing the electrolyte entering the second accommodating space to support the outer seal at the second accommodating space, which helps to prevent the outer seal from being concave and affecting the appearance of the battery cell. The support member can also support the composite tab, the conductive member and the battery cell body when the battery cell falls or is hit, which helps to avoid short circuits, high internal resistance and other problems.

[0006] According to some embodiments of the present invention, the support member is at least partially located between the composite tab and the outer seal.

[0007] According to some embodiments of the present invention, the support member includes an adhesive layer and a swelling layer connected to each other, the adhesive layer is bonded to the composite tab and / or the conductive member; the swelling layer is located in the second accommodating space and is used to expand after absorbing the electrolyte to support the outer seal.

[0008] According to some embodiments of the present invention, the maximum thickness of the swelling layer is ≥0.5 mm and ≤3 mm.

[0009] According to some embodiments of the present invention, the volume expansion rate of the swelling layer is ≥300%.

[0010] According to some embodiments of the present invention, the bonding layer includes a first section and a second section, the first section is located in the first accommodating space and is bonded to the battery cell body, the second section is located in the second accommodating space and is bonded to the composite tab and / or the conductive part, and the swelling layer is connected to the second section.

[0011] According to some embodiments of the present invention, the thickness of the adhesive layer is ≥10 μm and ≤50 μm, and / or the length of the adhesive layer is ≥10 mm and ≤25 mm.

[0012] According to some embodiments of the present invention, the battery cell further includes an insulating adhesive layer, which is bonded between the conductive part and the outer seal; along the length direction of the battery cell body, the distance between one end of the composite tab away from the conductive part and the insulating adhesive layer is ≥5mm and ≤15mm.

[0013] According to some embodiments of the present invention, the conductive member is welded to the composite tab to form a welding area, and the supporting member is connected to the welding area.

[0014] The battery according to the second embodiment of the present invention includes the battery cell in any of the above embodiments.

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

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

[0017] Figure 1 A schematic diagram of the structure of the battery cell provided by the embodiment of the present utility model when the support member is not expanded is shown;

[0018] Figure 2 A schematic structural diagram of the support member in the battery cell provided by an embodiment of the present utility model when expanded is shown.

[0019] Reference numerals:

[0020] Battery cell 100;

[0021] Battery cell body 110; second side surface 111; composite tab 130; first side surface 131;

[0022] Outer seal 150; first accommodating space 151; second accommodating space 153; conductive member 170;

[0023] Support member 190; adhesive layer 191; first section 1911; second section 1913; swelling layer 193;

[0024] Welding area 210; insulating adhesive layer 230; length direction X; thickness direction Y. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, 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. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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.

[0029] In the description of the present invention, reference to terms such as "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 exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0030] See also Figures 1 to 2 An embodiment of the present application provides a battery, which includes a battery cell 100 and a shell. The battery cell 100 can be accommodated in the shell, and the shell can be used to protect the battery cell 100.

[0031] Batteries can be used to provide power for new energy vehicles, electronic devices and other equipment.

[0032] In some embodiments, the battery cell 100 may be a wound battery cell or a laminated battery cell.

[0033] In some embodiments, the battery cell 100 includes a battery cell body 110 , a composite tab 130 , an outer seal 150 , a conductive member 170 (TAB), and a support member 190 .

[0034] The battery cell 100 may be an ultra-thin battery cell, and the battery cell 100 may have a multi-electrode battery cell structure.

[0035] The composite tab 130 is connected to one side of the battery cell body 110 and is formed by stacking a plurality of dummy tabs.

[0036] As an example, taking the battery cell 100 as a wound battery cell, the battery cell body 110 may include a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet, separator, and negative electrode sheet are stacked and wound to form the battery cell body 110. The electrode sheet (positive electrode sheet or negative electrode sheet) may include straight sections and curved sections alternately distributed along the winding direction. After the electrode sheet is wound, multiple straight sections are stacked along the thickness direction Y of the battery cell 100. Each straight section may have a protruding dummy tab along its side. After the electrode sheet is wound, the dummy tabs connected to the positive electrode sheet are stacked to form the positive electrode tab, and the dummy tabs connected to the negative electrode sheet are stacked to form the negative electrode tab. Both the positive electrode tab and the negative electrode tab may be composite tabs 130.

[0037] As an example, taking the battery cell 100 as a laminated battery cell, the battery cell body 110 may include a plurality of alternatingly stacked positive electrode sheets and a plurality of negative electrode sheets, with a separator disposed between the positive and negative electrode sheets, or one of the positive and negative electrode sheets being a bagged electrode sheet to prevent direct contact between the positive and negative electrode sheets. The plurality of positive electrode sheets and the plurality of negative electrode sheets are stacked to form the battery cell body 110. Each positive electrode sheet may have a protruding dummy tab protruding from its side, and each negative electrode sheet may also have a protruding dummy tab protruding from its side. After the positive and negative electrode sheets are stacked, the dummy tabs connected to the positive electrode sheets are stacked to form the positive tabs, and the dummy tabs connected to the negative electrode sheets are stacked to form the negative tabs. The positive and negative electrode tabs may be composite tabs 130.

[0038] A first accommodating space 151 and a second accommodating space 153 are provided in the outer seal 150. The battery cell body 110 is located in the first accommodating space 151, and the composite electrode tab 130 is located in the second accommodating space 153. The conductive member 170 is partially inserted in the second accommodating space 153 and electrically connected to the composite electrode tab 130. In this way, when the battery cell 100 is injected with liquid (electrolyte), the electrolyte can enter the first accommodating space 151 and the second accommodating space 153.

[0039] As an example, the outer seal 150 may further include an opening communicating with the second accommodating space 153. The conductive member 170 may be located at the opening. A portion of the conductive member 170 may be inserted through the opening into the second accommodating space 153 for electrical connection to the composite tab 130. The remaining portion of the conductive member 170 may be located outside the outer seal 150 for electrical connection to the battery terminal to transmit current. The outer seal 150 may be further sealed at the opening to prevent leakage of the electrolyte.

[0040] It is understood that there can be two conductive members 170 , namely a positive conductive member 170 and a negative conductive member 170 . The positive conductive member 170 is electrically connected between the positive tab (composite tab 130 ) and the positive electrode post of the battery, while the negative conductive member 170 is electrically connected between the negative tab (composite tab 130 ) and the negative electrode post of the battery. For ease of description, the following explanation will be based on a single electrically connected composite tab 130 and conductive member 170 .

[0041] The support member 190 is located in the second accommodating space 153 and is connected to the composite electrode tab 130 and / or the conductive member 170. It is used to expand after absorbing the electrolyte to support the outer seal 150, so that the support member 190 can expand after absorbing the electrolyte entering the second accommodating space 153 to support the outer seal 150 at the second accommodating space 153, which helps to prevent the outer seal 150 from being concave and affecting the appearance of the battery cell 100; in addition, the support member 190 can also support the composite electrode tab 130, the conductive member 170 and the battery cell body 110 when the battery cell 100 falls or is impacted, which helps to avoid short circuits, high internal resistance defects, etc.; and since the support member 190 can expand only after absorbing the electrolyte, there is no need to expand the support member 190 through subsequent processing steps (such as hot pressing steps), which helps to reduce the number of steps and increase production speed.

[0042] In some embodiments, the outer seal 150 may be made of an aluminum-plastic film.

[0043] In some embodiments, the composite tab 130 can be packaged in the outer seal 150 in a straight-out manner, that is, the composite tab 130 formed by stacking multiple dummy tabs is not bent, but is directly electrically connected to the conductive element 170 and then packaged in the outer seal 150.

[0044] In some embodiments, the support member 190 is at least partially located between the composite tab 130 and the outer seal 150 , which helps the support member 190 to better support the outer seal 150 after expansion.

[0045] It can be understood that in this embodiment, the conductive member 170 may or may not exist between the support member 190 and the composite tab 130. When the conductive member 170 does not exist between the support member 190 and the composite tab 130, the conductive member 170 can be electrically connected to other positions of the composite tab 130.

[0046] In some embodiments, after absorbing the electrolyte, the support member 190 expands by expanding the gaps between its own molecular chains. The support member 190 does not need to chemically react with the electrolyte, thereby preventing the support member 190 from affecting the performance of the battery cell 100 during the expansion process.

[0047] In some embodiments, the support member 190 may be connected only to the composite tab 130, only to the conductive member 170, or simultaneously to the conductive member 170 and the composite tab 130. In other embodiments, the support member 190 may also be connected to the inner wall of the outer seal 150.

[0048] In some embodiments, the conductive member 170 can be welded to the composite tab 130 to form a welding area 210, and the support member 190 can be connected to the welding area 210, so that the support member 190 can be located between the welding area 210 and the outer seal 150, which helps to prevent burrs in the welding area 210 from puncturing the outer seal 150.

[0049] As an example, the conductive member 170 may partially overlap one side of the composite tab 130 along the thickness direction Y. Along the thickness direction Y, the second accommodating space 153 may be located on the side of the conductive member 170 facing away from the composite tab 130. The overlapping area of the conductive member 170 and the composite tab 130 forms a welding area 210 after welding. The support member 190 may be located in the second accommodating space 153 and cover the welding area 210 located in the second accommodating space 153.

[0050] It is understandable that, without affecting the size of the battery cell 100 , the support member 190 may also surround and cover the welding area 210 , thereby better preventing the burrs of the welding area 210 from piercing the outer seal 150 .

[0051] In some embodiments, the support member 190 may be a flexible support member to better fit the composite tab 130 and / or the conductive member 170 .

[0052] In some embodiments, the support member 190 includes an adhesive layer 191 and a swelling layer 193 connected to each other, the adhesive layer 191 is bonded to the composite tab 130 and / or the conductive member 170, and the swelling layer 193 is located in the second accommodating space 153 and is used to expand after absorbing the electrolyte to support the outer seal 150, thereby helping to simplify the assembly steps and improve assembly efficiency.

[0053] As an example, the adhesive layer 191 and the swelling layer 193 may adopt an integrated structure. Specifically, the support member 190 may adopt a swelling tape. During the assembly process, the swelling tape only needs to be adhered to the composite tab 130 and / or the conductive member 170 to complete the assembly.

[0054] It should be noted that the adhesive layer 191 and the swelling layer 193 may also be separate structures, and the swelling layer 193 may be connected to the adhesive layer 191 through subsequent processing.

[0055] In some embodiments, the swelling layer 193 may be made of a polymer material so as to swell after absorbing the electrolyte. For example, the swelling layer 193 may be made of oriented polystyrene (OPS), biaxially oriented polypropylene (BOPP), biaxially oriented polyamide (BOPA), biaxially oriented polyester (BOPET) or other materials that can swell after absorbing the electrolyte.

[0056] In some embodiments, the swelling layer 193 is at least partially located between the adhesive layer 191 and the outer seal 150 to better support the outer seal 150 after expansion.

[0057] In some embodiments, the maximum thickness of the swelling layer 193 is ≥ 0.5 mm and ≤ 3 mm (e.g. Figure 1 The maximum thickness of the swelling layer 193 may refer to the maximum thickness of the swelling layer 193 when not expanded.

[0058] The maximum thickness of the swelling layer 193 may be the thickness between the side of the swelling layer 193 facing the outer seal 150 and the side of the swelling layer 193 facing away from the outer seal 150. Alternatively, when the support member 190 is in a flat state (i.e., when the support member 190 is not assembled in the battery cell 100), the maximum thickness of the swelling layer 193 may also refer to the maximum thickness of the swelling layer 193 when the support member 190 is in a flat state.

[0059] As an example, the maximum thickness of the swelling layer 193 may be 0.5 mm, 0.8 mm, 2 mm, 3 mm, or other values in the interval [0.5 mm, 3 mm].

[0060] It is understandable that, since the shape of the second accommodating space 153 is not regular, the thickness of each position of the swelling layer 193 may also be different to better fit the second accommodating space 153 .

[0061] As an example, the thickness of the swelling layer 193 at other locations except the location with the maximum thickness may be less than 0.5 mm. For example, the thickness of the swelling layer 193 at other locations may be 0.1 mm, 0.2 mm, 0.35 mm, 0.49 mm, etc.

[0062] In some embodiments, the volume expansion rate of the swelling layer 193 is ≥300%, which helps the swelling layer 193 to have a sufficiently large expansion volume after expansion to better support the outer seal 150, and also helps to reduce the material of the swelling layer 193 and reduce manufacturing costs.

[0063] As an example, the volume expansion rate of the swelling layer 193 may be 300%, 350%, 380% or other percentage values.

[0064] As an example, the volume of the swelling layer 193 before expansion is 2 mm 3 The volume expansion rate of the swelling layer 193 is 300%, so the volume of the swelling layer 193 after absorbing the electrolyte is approximately 2mm 3 +(2mm 3 ×300%), that is, the volume of the swelling layer 193 after absorbing the electrolyte is about 8mm 3 .

[0065] In some embodiments, the adhesive layer 191 can be bonded to the welding area 210 formed after welding the conductive member 170 and the composite tab 130 , so that the adhesive layer 191 can protect the outer seal 150 and help reduce the situation where burrs in the welding area 210 pierce the outer seal 150 .

[0066] In some embodiments, the thickness of the adhesive layer 191 is ≥10 μm and ≤50 μm. In this way, the thickness of the adhesive layer 191 can be controlled within a suitable range, which helps to avoid affecting the bonding effect due to the adhesive layer 191 being too thin or too thick.

[0067] As an example, the thickness of the adhesive layer 191 may be 10 μm, 15 μm, 25 μm, 32 μm, 44 μm, 50 μm, or other values in the range of [10 μm, 50 μm].

[0068] In some embodiments, the length of the adhesive layer 191 is ≥10 mm and ≤25 mm, thereby ensuring that the adhesive layer 191 has sufficient length to bond the battery cell body 110 , the composite tab 130 and the conductive member 170 .

[0069] As an example, the length of the adhesive layer 191 may be 10 mm, 15 mm, 20 mm, 25 mm, or other values in the interval [10 mm, 25 mm].

[0070] It can be understood that the length of the adhesive layer 191 can be related to the size of the battery cell body 110. Specifically, the length of the adhesive layer 191 can be related to the length of the composite electrode tab 130 and the conductive member 170. The longer the length of the composite electrode tab 130 and / or the conductive member 170, the longer the length of the adhesive layer 191.

[0071] In some embodiments, the adhesive layer 191 may include a base film layer and a viscous layer connected to each other. The viscous layer and the swelling layer 193 may be connected to opposite sides of the base film layer, respectively. The viscous layer may be used for bonding.

[0072] In some embodiments, the adhesive layer 191 may include a first segment 1911 and a second segment 1913 , and the first segment 1911 and the second segment 1913 may be distributed along the length direction X.

[0073] Among them, the first section 1911 can be bonded to the battery cell body 110, and the second section 1913 can be bonded to the composite pole tab 130 and / or the conductive member 170. In this way, the adhesive layer 191 can play a role of bonding and fixing, which helps to better fix the composite pole tab 130 and / or the conductive member 170.

[0074] As an example, the first section 1911 can be bonded to the battery cell body 110, and the second section 1913 can include a first part and a second part connected to each other, the first part is connected between the first section 1911 and the second part, the first part can be bonded to the composite tab 130, and the second part can be bonded to the conductive part 170.

[0075] As another example, the first section 1911 may be bonded to the battery cell body 110 , and the second section 1913 may be bonded only to the composite tab 130 .

[0076] As another example, the first segment 1911 may be bonded to the battery cell body 110 , and the second portion of the second segment 1913 may be bonded to the conductive member 170 .

[0077] In some embodiments, the first section 1911 can be located in the first accommodating space 151, the second section 1913 can be located in the second accommodating space 153, and the support member 190 can be connected to the second section 1913, so that the support member 190 can be controlled in the second accommodating space 153, which helps to prevent the support member 190 from lifting the outer seal 150 at the first accommodating space 151 after expansion, thereby affecting the thickness of the battery cell 100.

[0078] In some embodiments, the battery cell 100 may further include an insulating adhesive layer 230 . The insulating adhesive layer 230 may be bonded between the conductive member 170 and the outer seal 150 to help prevent leakage of the electrolyte in the outer seal 150 .

[0079] As an example, the insulating adhesive layer 230 may be tab adhesive, which may be bonded between the conductive member 170 and the outer seal 150 to seal the gap between the conductive member 170 and the outer seal 150 .

[0080] In some embodiments, along the length direction X of the battery cell body 110, the distance between the end of the composite tab 130 away from the conductive member 170 and the insulating rubber layer 230 is ≥5 mm and ≤15 mm (e.g. Figure 1 In this way, since the outer seal 150 needs to be connected to the insulating rubber layer 230 at the opening, the volume of the second accommodating space 153 can be controlled by controlling the distance between the composite tab 130 and the insulating rubber layer 230, which helps to avoid the second accommodating space 153 being too large and affecting the size of the battery cell 100. It can also avoid the problem that the outer seal 150 is more likely to be concave due to the large volume of the second accommodating space 153.

[0081] As an example, the distance between the end of the composite tab 130 facing away from the conductive member 170 and the insulating adhesive layer 230 can be 5 mm, 7 mm, 10 mm, 12.5 mm, 15 mm, or other values in the range [5 mm, 15 mm].

[0082] Among them, the distance between the end of the composite electrode 130 away from the conductive part 170 and the insulating rubber layer 230 can specifically refer to the distance between the edge where the battery cell body 110 and the composite electrode 130 are connected and the end of the insulating rubber layer 230 away from the battery cell body 110 along the length direction X of the battery cell body 110.

[0083] In some embodiments, the number of the support members 190 can be one or two, and can be specifically designed according to the stacking method of the composite tabs 130 .

[0084] As an example, along the thickness direction Y of the cell body 110, the composite tab 130 formed by stacking multiple dummy tabs can be located approximately in the center of the cell body 110. This creates two spaces, defined as a first space and a second space, between the outer seal 150 and the upper and lower sides of the composite tab 130 along the thickness direction Y. It is understood that both the first space and the second space are located within the second accommodating space 153. The conductive member 170 can partially overlap the composite tab 130 and be located in the first space. Support members 190 can then be disposed in both the first and second spaces. The support member 190 located in the first space can connect to at least one of the composite tab 130 and the conductive member 170, while the support member 190 located in the second space can connect only to the composite tab 130. It is understood that the conductive member 170 can also be located in the second space. In this case, the support member 190 located in the first space can connect only to the composite tab 130, while the support member 190 located in the second space can connect to at least one of the composite tab 130 and the conductive member 170.

[0085] As another example, along the thickness direction Y of the battery cell body 110, one of the side surfaces of the composite electrode tab 130 (defined as the first side surface 131) can be approximately at the same height as the side surface of the battery cell body 110 (defined as the second side surface 111), then there is only a first space between one side of the composite electrode tab 130 and the outer seal 150, the conductive member 170 can be partially overlapped on one side of the composite electrode tab 130 along the thickness direction and located in the first space, and the support member 190 can be located in the first space and connect the conductive member 170 and at least one of the composite electrode tab 130.

[0086] In the battery cell 100 and the battery provided in the embodiment of the present application, a first accommodating space 151 and a second accommodating space 153 are provided in the outer seal 150, and the battery cell body 110 is located in the first accommodating space 151; the composite electrode tab 130 is connected to one side of the battery cell body 110 and is located in the second accommodating space 153; the conductive member 170 is partially inserted in the second accommodating space 153 and is electrically connected to the composite electrode tab 130, and the electrolyte can enter the first accommodating space 151 and the second accommodating space 153. The support member 190 is located in the second accommodating space 153 and is connected to the composite pole ear 130 and / or the conductive member 170. The support member 190 can expand after absorbing the electrolyte entering the second accommodating space 153 to support the outer seal 150 at the second accommodating space 153, which helps to prevent the outer seal 150 from being concave and affecting the appearance of the battery cell 100. The support member 190 can also support the composite pole ear 130, the conductive member 170 and the battery cell body 110 when the battery cell 100 falls or is hit, which helps to avoid short circuits, high internal resistance and other situations.

[0087] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A battery cell, characterized in that: include: Battery cell body; A composite tab, which is connected to one side of the battery cell body and is formed by stacking multiple dummy tabs; An outer seal, wherein a first accommodating space and a second accommodating space are provided in the outer seal, the battery cell body is located in the first accommodating space, and the composite tab is located in the second accommodating space; a conductive member, wherein the conductive member is partially inserted into the second accommodating space and electrically connected to the composite tab; as well as A support member is located in the second accommodating space and is connected to the composite tab and / or the conductive member, and is used to expand after absorbing electrolyte to support the outer seal.

2. The battery cell according to claim 1, characterized in that The support member is at least partially located between the composite tab and the outer seal.

3. The battery cell according to claim 1, characterized in that The support member includes an adhesive layer and a swelling layer connected to each other, the adhesive layer is bonded to the composite tab and / or the conductive member; the swelling layer is located in the second accommodating space and is used to expand after absorbing the electrolyte to support the outer seal.

4. The battery cell according to claim 3, characterized in that The maximum thickness of the swelling layer is ≥0.5 mm and ≤3 mm.

5. The battery cell according to claim 3, characterized in that: The volume expansion rate of the swelling layer is ≥300%.

6. The battery cell according to claim 3, characterized in that The bonding layer includes a first section and a second section, the first section is located in the first accommodating space and is bonded to the battery cell body, the second section is located in the second accommodating space and is bonded to the composite tab and / or the conductive member, and the swelling layer is connected to the second section.

7. The battery cell according to claim 3, characterized in that The thickness of the adhesive layer is ≥10 μm and ≤50 μm, and / or the length of the adhesive layer is ≥10 mm and ≤25 mm.

8. The battery cell according to claim 1, characterized in that The battery core further comprises an insulating adhesive layer, wherein the insulating adhesive layer is bonded between the conductive member and the outer seal; Along the length direction of the battery core body, the distance between the end of the composite tab away from the conductive member and the insulating rubber layer is ≥5 mm and ≤15 mm.

9. The battery cell according to claim 1, characterized in that The conductive member is welded to the composite tab to form a welding area, and the supporting member is connected to the welding area.

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

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