A type of battery

Abstract

This application discloses a battery that reduces the problem of electrode flaps easily tearing due to wrinkles during the flattening process of the wound battery cell. The battery includes: a housing and a wound battery cell, wherein the wound battery cell is disposed within the housing, and the wound battery cell includes a cell body and electrodes connected to each other, the electrodes extending from at least one end of the cell body; the cell body has a flat structure, including a short side side and a long side side connected to each other, and the distance 'a' between the short side side and the electrodes along the extending direction of the long side side satisfies: 3mm ≤ a ≤ 40mm.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and more particularly to a battery. Background Technology

[0002] Before being assembled into a prismatic housing, the wound battery cell is first pressed from a cylindrical shape into an approximately elliptical cylindrical shape. The flattened wound battery cell is prone to tearing of the tabs, which affects the current carrying capacity of the tabs and fails to meet the current carrying capacity requirements of the tabs. Furthermore, the internal resistance is high after the tabs are torn, resulting in greater heat generation and potentially leading to safety risks such as thermal runaway. Utility Model Content

[0003] To address the aforementioned issues, this application provides a battery that reduces the problem of the tabs easily tearing due to wrinkles occurring during the flattening process of the wound battery cell.

[0004] This application provides a battery comprising: a casing and a wound cell, wherein the wound cell is disposed within the casing, and the wound cell includes a cell body and a tab connected to each other, the tab extending from at least one end of the cell body; the cell body has a flat structure, including a short side and a long side connected to each other, and the distance 'a' between the short side and the tab along the extending direction of the long side satisfies: 3mm ≤ a ≤ 40mm.

[0005] In the above embodiments, the battery refers to a single battery cell. The cell body includes two end faces (i.e., an upper end face and a lower end face), two long side faces and two short side faces connected between the two end faces. The tabs extend from the end faces of the cell body, for example, they can extend outward from the upper end face. The two long side faces of the cell body extend in the same direction as the long side faces of the casing, and the extension direction of these long side faces is considered to be the length direction of the winding of the cell. The two short side faces of the cell body extend in the same direction as the short side faces of the casing. The two long side faces are generally planar, and the two short side faces can be generally curved. By adjusting the distance 'a' between the short side faces and the tabs, a preset distance between the tabs and the short side faces can be maintained to ensure the current carrying capacity of the tabs. If the value of 'a' is less than the above design range, the distance between the tabs and the short side faces is too close, and the tabs are easily affected by the large interlayer compression force at the short side faces, causing wrinkles in the tabs and making them prone to tearing, thus affecting the current carrying capacity of the tabs. Furthermore, tearing of the tab will increase its internal resistance and heat generation, which can easily lead to safety risks such as battery thermal runaway. If the value of 'a' is greater than the above design range, the size of the tab will be reduced in order to reduce interference between the tab and other components inside the casing, which will also affect the overcurrent of the tab. Attached Figure Description

[0006] Figure 1 An exploded view of a battery provided for one embodiment of this application;

[0007] Figure 2 A side view of a wound battery cell provided for one embodiment of this application;

[0008] Figure 3 A schematic diagram of the battery structure provided in one embodiment of this application;

[0009] Figure 4 An assembly drawing of a wound battery cell and an adapter sheet provided for one embodiment of this application;

[0010] Figure 5 An exploded view of a battery provided for another embodiment of this application;

[0011] Figure 6 A structural diagram of the tab and the electrode provided in one embodiment of this application;

[0012] Figure 7 A structural diagram of the tab and electrode provided for another embodiment of this application;

[0013] Figure 8 This is a structural diagram of the tab and electrode provided for another embodiment of this application.

[0014] Figure label:

[0015] 1-Shell; 2-Cell body; 3-Taper; 101-Shell body; 102-First wall; 201-Short side; 202-Long side; 203-Upper end face; 204-Lower end face; 103-Long side of the shell; 104-Short side of the shell; 4-Adapter piece; 401-First adapter piece; 402-Second adapter piece; 5-Position post; 501-First pole post; 502-Second pole post; 301-First tab; 302-Second tab; 6-Soldering area; 7-Explosion-proof valve; 8-First core; 9-Second core; 801-First sub-tab; 901-Second sub-tab; 802-First core body; 8021-First short side; 8022-Second short side; 210-Electrode piece; 310-Taper piece; 2101-Current collector; 2102-Active material layer. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.

[0017] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0018] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0019] A battery cell is the smallest unit in a battery that provides energy. In related technologies, a battery cell mainly includes a housing and battery cover assembly that enclose a cavity, a cell assembly disposed within the cavity, and electrolyte filling the cavity through an injection hole on the battery cover assembly. The cell assembly mainly includes a positive electrode sheet, a negative electrode sheet, and a separator assembled together in a wound or stacked manner, as well as a Mylar coating film that provides insulation and protection for the cell assembly. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector sheets are stacked together to form the positive electrode tab, which is used for electrical connection to the positive electrode post disposed on the battery cover assembly. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector layers are stacked together to form the negative electrode tab, which is used for electrical connection to the negative electrode post located on the battery cover assembly. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative current collector can be made of copper, and the negative active material layer can be made of carbon or silicon, etc. The separator material can be PP (polypropylene) or PE (polyethylene), etc.

[0020] During the manufacturing process of a battery cell, the cell assembly is first placed inside the housing, then the battery cover assembly is closed to the housing, and then the electrolyte is injected into the cavity formed by the battery cover assembly and the housing through the injection hole on the battery cover assembly. Finally, the injection hole on the battery cover assembly is sealed with a sealing component.

[0021] A wound battery cell is formed by stacking and winding positive electrode plates, negative electrode plates, and a separator. Before being assembled into a square battery casing, the wound cell is first pressed from a cylindrical shape into a flat structure, such as a square or approximately elliptical cylinder. The flattened wound cell has two long sides and two short sides. The two long sides may be roughly planar, and the two short sides may be roughly curved; or both may be roughly planar or curved. Flattening results in uneven pressure distribution between the layers inside the wound cell. For example, the compressive force is greater near the short sides, resulting in relatively tighter interlayers, while the compressive force is less near the long sides, resulting in relatively looser interlayers. Due to the greater compressive force on the short sides, the tabs at this location are more susceptible to compressive stress and wrinkling. Stress concentration can easily occur at the creases of the battery tabs. During use, such as when an electric vehicle is traveling on bumpy roads, the continuous vibration inside the battery may cause the creases of the tabs to tear. Alternatively, when the battery is subjected to external impact or compression, the creases of the tabs may tear due to excessive instantaneous deformation. Tearing will affect the current carrying capacity of the tabs, making them unable to meet the current requirements. Furthermore, a torn tab will have higher internal resistance and generate more heat, potentially leading to safety risks such as thermal runaway of the battery.

[0022] In view of this, embodiments of this application provide a battery that reduces safety issues caused by the easy tearing of the tabs due to creases. Embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0023] Figure 1 An exploded view of a battery provided in one embodiment of this application. Figure 2 A side view of a wound battery cell provided for one embodiment of this application. Figure 3 This is a schematic diagram of the battery structure provided in one embodiment of this application. Figures 1-3 As shown, this application provides a battery comprising: a casing 1 and a wound battery cell. The wound battery cell is disposed within the casing 1 and includes a battery cell body 2 and a tab 3 connected to each other. The tab 3 extends from at least one end of the battery cell body 2. The battery cell body 2 includes a short side surface 201 and a long side surface 202 connected to each other. Along the extending direction X of the long side surface 202, the distance 'a' between the farthest end of the short side surface 201 and the tab 3 satisfies: 3mm ≤ a ≤ 40mm.

[0024] In the above embodiments, "battery" refers to a single battery cell. The cell body 2 includes two end faces (i.e., Figure 1The upper end face 203 and lower end face 204 of the cell body 2, and two long side faces 202 and two short side faces 201 connecting the two end faces. The tab 3 extends from the end face of the cell body 2, for example, it can extend outward from the upper end face 203. The two long side faces 202 of the cell body 2 extend in the same direction as the long side face 103 of the casing, both in the X direction, which is considered the length direction of the winding of the cell. The two short side faces 201 of the cell body 2 extend in the same direction as the short side face 104 of the casing, both in the Y direction. Figure 1 As shown, the two long side surfaces 202 are roughly planar, while the two short side surfaces 201 can be roughly curved. By adjusting the distance 'a' between the short side surface 201 and the tab 3, a preset distance is maintained between the tab 3 and the short side surface 201, ensuring the current carrying capacity of the tab 3. The value of 'a' can be, for example, 3mm, 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 36mm, or 40mm. If the value of 'a' is less than the above design range, the distance between the tab 3 and the short side surface 201 is too close, and the tab 3 is easily affected by the large interlayer compression force at the short side surface 201, causing wrinkles and tearing, thus affecting the current carrying capacity of the tab 3. Furthermore, tearing of the tab 3 will increase its internal resistance and heat generation, potentially leading to battery thermal runaway and other safety risks. If the value of 'a' is greater than the above design range, the size of the tab 3 will be reduced to minimize interference between the tab 3 and other components within the casing, which will also affect the current carrying capacity of the tab 3.

[0025] It is worth noting that the flattened wound cell may also take on other shapes. For example, the two long side surfaces 202 may be roughly planar, and the two short side surfaces 201 may also be roughly planar; or, the two long side surfaces 202 may be roughly curved, and the two short side surfaces 201 may also be roughly curved. This application does not impose specific limitations on the shape of the flattened wound cell.

[0026] For ease of description, the wound cell will be referred to as the core in the following text.

[0027] Please continue to refer to this. Figure 3 In a further embodiment, the battery casing 1 includes a casing body 101 enclosing a receiving cavity and a battery cover assembly, with the winding core disposed within the receiving cavity. The battery also includes an adapter 4 and terminals 5, the adapter 4 being electrically connected to the terminals 5, for example, by welding the adapter 4 to the terminals 5. The terminals 5 are used for electrical connection with the winding core to output or input electrical energy into the battery. The terminals 5 are fixedly mounted to a first wall 102 of the casing 1, which can be the aforementioned battery cover assembly. The space between the adapter 4 and the cell body 2 is limited; to save space and thus increase the energy density of the battery, such as… Figure 4 As shown, Figure 4This application provides an assembly diagram of a wound battery cell and an adapter plate according to one embodiment of the present application. At least a portion of the tabs 3 are disposed on the side of the adapter plate 4 facing away from the battery cell body 2. Specifically, the tab 3 includes a first end A and a second end B. The second end B is connected to the battery cell body 2, and the first end A bypasses the adapter plate 4, extends into the space between the adapter plate 4 and the first wall 102, and is welded to the adapter plate 4. Since the first end A of the tab 3 is disposed on the upper surface of the adapter plate 4 and welded to the adapter plate 4, the tab 3 is simultaneously subjected to tension from both the battery cell body 2 and the weld joint of the adapter plate 4. The tab 3 is subjected to multiple forces, and in addition, the tab 3 is subjected to the compressive force from the short side 201 of the wound battery cell, making it more prone to tearing. Therefore, in this embodiment, the value of a needs to satisfy: 5mm ≤ a ≤ 40mm, to further reduce the impact of the compressive force from the short side 201 on the tab 3. The value of 'a' can be, for example, 5mm, 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 36mm, or 40mm, but is not limited to these values.

[0028] In one embodiment, the electrode post 5 includes a first electrode post 501 and a second electrode post 502, and the electrode tab 3 includes a first electrode tab 301 and a second electrode tab 302. Specifically, the first electrode post 501 can be a positive electrode post, and the second electrode post 502 is a negative electrode post. The first electrode post 501 and the second electrode post 502 are spaced apart on the first wall 102 of the housing 1. Specifically, the first wall 102 is provided with two through holes spaced apart, and the first electrode post 501 and the second electrode post 502 are respectively passed through and fixed in the two through holes. The first electrode tab 301 is a positive electrode tab, and the second electrode tab 302 is a negative electrode tab. The adapter piece 4 includes a first adapter piece 401 and a second adapter piece 402. The first adapter piece 401 is welded to the end of the first electrode post 501 facing the cell body 2, and the second adapter piece 402 is welded to the end of the second electrode post 502 facing the cell body 2. The first tab 301 is soldered to the first adapter piece 401 and electrically connected to the first terminal 501 through the first adapter piece 401. The second tab 302 is soldered to the second adapter piece 402 and electrically connected to the second terminal 502 through the second adapter piece 402. The cell body 2 has a first short side 8021 and a second short side 8022. The first tab 301 is located on the cell body 2 near the first short side 8021, and the second tab 302 is located on the cell body 2 near the second short side 8022. The distance a1 between the first short side 8021 and the first tab 301, and the distance a2 between the second short side 8022 and the second tab 302, satisfy: 5mm ≤ a1 ≤ 38mm, 5mm ≤ a2 ≤ 38mm. The current flow between the first terminal 501 and the second terminal 502 will compete with each other. To ensure that the current flow capacity between both terminals 5 and the tab 3 meets the requirements, the values ​​of a1 and a2 need to be limited to the above range to avoid the distance between the two terminals 5 and the two tabs 3 being too close. The values ​​of a1 can be, for example, 5mm, 6mm, 12mm, 16mm, 22mm, 28mm, 32mm, 36mm, and 40mm, but are not limited to these values. The values ​​of a2 can be, for example, 5mm, 6mm, 12mm, 16mm, 22mm, 28mm, 32mm, 36mm, and 40mm, but are not limited to these values.

[0029] The first end of the tab 3 is welded to the adapter piece 4, causing the first end of the tab 3 to be subjected to the tensile force of the solder mark, while the second end is subjected to the compressive force from the short side surface 201. If the forces at both ends are too large, the tab 3 is prone to tearing. In one embodiment, the adapter piece 4 and the tab 3 are welded together to form a solder mark area 6, which can be a rectangular area extending along the width direction of the tab 3. The width direction of the tab 3 is the extension direction of the long side surface 202. The distance b between the end of the solder mark near the short side surface 201 and the short side surface 201 satisfies: 15mm ≤ b ≤ 60mm. The value of b can be, for example, 15mm, 20mm, 23mm, 25mm, 30mm, 36mm, 40mm, 45mm, 50mm, 55mm, 60mm, but is not limited to these values. The end of the solder mark area 6 away from the short side surface 201 is fixed. If the value of b is less than the above design range, the left side of the tab 3 will be subjected to a large tensile force, and tearing may occur at this location. If the value of b is greater than the above design range, the solder area 6 between the tab 3 and the adapter piece 4 will be smaller, resulting in poor current carrying capacity between the tab 3 and the adapter piece 4.

[0030] In one embodiment, the battery further includes an explosion-proof valve 7, which serves as a pressure relief mechanism for the battery. This valve releases internal pressure when the internal pressure reaches a pressure threshold, providing safety protection. The explosion-proof valve 7 is disposed on the first wall 102, and the projections of the first tab 301 and the second tab 302 onto the first wall 102 do not overlap with the explosion-proof valve 7 at least partially. This reduces the impact of the tabs 3 on the pressure relief performance of the explosion-proof valve 7. In this embodiment, two scenarios are included: one where the projections of the first tab 301 and the second tab 302 onto the first wall 102 overlap with the explosion-proof valve 7. This is due to assembly errors or manufacturing processes, where a small portion of the tabs 3 may extend towards the explosion-proof valve 7 and partially obstruct it. However, since the obstruction area is small, it has virtually no impact on the pressure relief performance of the explosion-proof valve 7. The other scenario is where the projections of the first tab 301 and the second tab 302 onto the first wall 102 do not overlap with the explosion-proof valve 7 at all. This is the ideal state during assembly and manufacturing, where the tab 3 and the explosion-proof valve 7 do not interfere with each other at all, and the tab 3 has no effect on the pressure relief performance of the explosion-proof valve 7.

[0031] In a further embodiment, the tab 3 and the explosion-proof valve 7 are completely independent of each other. The first tab 301 and the second tab 302 are respectively spaced from the explosion-proof valve 7 by a preset distance c, which satisfies the condition: 1mm ≤ c ≤ 30mm. The value of c can be, for example, 1mm, 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, or 30mm, but is not limited to these values. Since the width of the tab 3 is fixed, if the value of c is greater than the above design range, the distance between the tab 3 and the short side 201 will be too close, and the tab 3 will be easily torn.

[0032] Figure 5 An exploded view of a battery provided for another embodiment of this application, such as... Figure 5 As shown, to improve the energy density of the battery, multiple winding cores can be provided in the casing 1. In one embodiment, the winding cores include a first winding core 8 and a second winding core 9 arranged along the extending direction of the short side 201. The first winding core 8 includes a first sub-tab 801, and the second winding core 9 includes a second sub-tab 901. The first sub-tab 801 and the second sub-tab 901 are respectively connected to the same adapter plate 4 and to the same terminal post 5. Specifically, the first sub-tab 801 and the second sub-tab 901 can both be positive tabs or both be negative tabs. The two positive tabs are connected to the positive terminal post through the same adapter plate 4, or the two negative tabs are connected to the negative terminal post through the same adapter plate 4. The structures of the first winding core 8 and the second winding core 9 can be the same, and the first winding core 8 and the second winding core 9 are symmetrically arranged with their contact surfaces as the center. The first core 8 includes a first core body 802, which includes a first short side surface 8021. The distance a3 between the first short side surface 8021 and the first sub-tab 801 satisfies: 6mm ≤ a3 ≤ 40mm. The value of a3 can be, for example, 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, or 40mm, but is not limited to these values. When the battery has two cells, the two cells are closely arranged and press against each other. The interlayer compressive force at the short side surface 201 of each cell is greater than when using a single core. The value of a3 is within the above range, which can reduce the impact of the compressive force on the tab 3 and prevent tearing.

[0033] In a further embodiment, at least a portion of the first sub-taper 801 is located on the side of the adapter plate 4 opposite to the first core body 802 and is welded to the adapter plate 4. The distance a3 between the first short side 8021 and the first sub-taper 801 satisfies: 8mm ≤ a3 ≤ 40mm. The value of a3 can be, for example, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, or 40mm, but is not limited to these values. The placement of a portion of the first sub-taper 801 on top also increases the tensile force on the first sub-taper 801, making it prone to tearing. Therefore, setting the value of a within the above range can reduce the likelihood of tearing of the first sub-taper 801. Similarly, at least a portion of the second sub-taper 901 is placed on the adapter plate 4. The distance a4 between the second short side 8021 and the second sub-taper 901, within the allowable error range, is the same as the value of a3.

[0034] Figure 6 For a structural diagram of the tab and electrode provided in one embodiment of this application, please refer to [link / reference]. Figure 4 and Figure 6In one embodiment, the cell body 2 includes multiple electrode plates 210, and the tab 3 includes multiple tab pieces 310, with each tab piece 310 connected to one electrode plate 210. After extending from the cell body 2, the multiple tab pieces 310 converge and are then integrally welded to the adapter piece 4. Each electrode plate 210 includes a current collector 2101 and an active material layer 2102. The active material layer 2102 is coated on the surface of the current collector 2101. Typically, an area without the active material layer 2102 is left at the edge of the current collector 2101, and this area is cut off to form the tab piece 310. During cutting, the connection between each electrode plate 210 and the tab piece 310 is rounded to ensure a smooth transition between the electrode plate 210 and the tab piece 310, reducing stress concentration and thus preventing tearing of the tab piece 3. Furthermore, the connection between electrode 210 and tab 310 is rounded, resulting in a larger connection area and better current-carrying capacity of tab 3. In this embodiment, the distance 'a' between the short side 201 and tab 3 satisfies: 3mm ≤ a ≤ 38mm. The value of 'a' can be, for example, 3mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 38mm, but is not limited to these values. With 'a' within the above design range, tab 3 is less prone to tearing, further ensuring its current-carrying capacity.

[0035] Figure 7 The diagram shows the structure of the tab and electrode sheet according to another embodiment of this application. Figure 8 This is a structural diagram of the tab and electrode provided for another embodiment of this application. (See diagram below.) Figure 7 or Figure 8 In another embodiment, the connection between the electrode 210 and the tab 310 is a right angle or an obtuse angle. When cutting the tab 310, a right or obtuse angle at the connection reduces the likelihood of the cutting blade sticking to the tab 310, thus improving the cutting accuracy. In this embodiment, when the connection between the electrode 210 and the tab 310 is set to a right angle or an obtuse angle, stress concentration is likely at this connection, making the tab 3 more prone to tearing. Therefore, the distance 'a' between the short side 201 and the tab 3 must satisfy: 5mm ≤ a ≤ 38mm to reduce the occurrence of tearing. Furthermore, even if the area of ​​the connection between the tab 310 and the electrode 210 is smaller than the area with a rounded corner, resulting in poorer current-carrying capacity for the tab 3, a value of 'a' within the above range can still maintain good current-carrying capacity for the tab 3. The value of 'a' can be, for example, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 38mm, but is not limited to these values.

[0036] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery, characterized in that, include: A housing and a wound cell, the wound cell being disposed within the housing, the wound cell comprising a cell body and tabs connected to each other, the tabs extending from at least one end of the cell body; The cell body includes a short side and a long side that are connected to each other. Along the extending direction of the long side, the distance 'a' between the farthest end of the short side and the tab satisfies: 3mm ≤ a ≤ 40mm.

2. The battery according to claim 1, characterized in that, The battery further includes an adapter plate and a terminal post. The housing includes a first wall, and the terminal post is fixedly installed on the first wall. The terminal post is electrically connected to the adapter plate. At least a portion of the tabs are located on the side of the adapter plate away from the cell body. The adapter plate is welded to the tabs. The distance 'a' between the farthest end of the short side and the tab along the extension direction of the long side satisfies: 5mm ≤ a ≤ 40mm.

3. The battery according to claim 2, characterized in that, The electrode post includes a first electrode post and a second electrode post, the electrode tab includes a first electrode tab and a second electrode tab, the adapter plate includes a first adapter plate and a second adapter plate, the first electrode tab is electrically connected to the first electrode post through the first adapter plate, the second electrode tab is electrically connected to the second electrode post through the second adapter plate, the short side includes a first short side and a second short side, the distance a1 between the farthest end of the first short side and the first electrode tab along the extension direction of the long side satisfies: 5mm≤a1≤38mm; the distance a2 between the second short side and the second electrode tab satisfies: 5mm≤a2≤38mm.

4. The battery according to claim 2, characterized in that, The adapter piece is welded to the electrode tab to form a solder mark area. Along the extension direction of the long side, the distance b between the solder mark and the farthest end of the short side satisfies: 15mm≤b≤60mm.

5. The battery according to claim 2, characterized in that, The battery also includes an explosion-proof valve, which is disposed on the first wall. The orthographic projections of the first tab and the second tab on the first wall do not overlap with the explosion-proof valve in at least a portion.

6. The battery according to claim 5, characterized in that, The first electrode and the second electrode are respectively spaced from the explosion-proof valve by a preset distance c, wherein the preset distance c satisfies: 1mm≤c≤30mm.

7. The battery according to claim 1, characterized in that, The wound cell includes a first core and a second core arranged along the extension direction of the short side. The first core includes a first sub-tab, and the second core includes a second sub-tab. The battery also includes an adapter and a terminal post. The first sub-tab and the second sub-tab are respectively connected to the same terminal post through the same adapter. The first core includes a first core body, the first core body includes a first short side side, and the distance a3 between the farthest end of the first short side side and the first sub-pole tab along the extending direction of the long side side satisfies: 6mm≤a3≤40mm.

8. The battery according to claim 7, characterized in that, At least a portion of the first sub-pole tab is located on the side of the adapter piece away from the first core body and is welded to the adapter piece. The distance a3 between the farthest end of the first short side side and the first sub-pole tab along the extension direction of the long side side satisfies: 8mm≤a3≤40mm.

9. The battery according to claim 1, characterized in that, The battery cell body includes multiple electrode plates, and the electrode tab includes multiple electrode tab plates. The connection between the electrode plate and the electrode tab plate is rounded. The distance 'a' between the farthest end of the short side side and the electrode tab along the extension direction of the long side side satisfies: 3mm≤a≤38mm.

10. The battery according to claim 1, characterized in that, The battery cell body includes multiple electrode plates, and the electrode tab includes multiple electrode tab plates. The connection between the electrode plate and the electrode tab plate is a right angle or an obtuse angle. The distance 'a' between the farthest end of the short side side and the electrode tab along the extension direction of the long side side satisfies: 5mm ≤ a ≤ 38mm.

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