Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. A first through hole is formed in a first wall of the shell, the electrode assembly is contained in the shell, the first terminal part is located on the side, away from the electrode assembly, of the first wall, the second terminal part is located on the side, close to the electrode assembly, of the first wall, and the second terminal part is electrically connected with the electrode assembly. A third terminal portion connected with the first terminal portion and the second terminal portion respectively is at least partially located in the first through hole, and a gap is formed between the first terminal portion and the insulator located between the first terminal portion and the first wall. The gap can relieve the vibration extrusion of the insulating part on the first terminal part, and can provide a pre-deformation space for the first terminal part to offset the thermal deformation of the first terminal part and reduce the upwarp of the surface of the side, departing from the electrode assembly, of the first terminal part, so that the surface of the side, departing from the electrode assembly, of the first terminal part has better flatness.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to battery cells, battery devices, and power-consuming devices. Background Technology

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already in widespread use.

[0003] In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In related technologies, the electrode terminal assemblies of the battery cells are electrically connected to each other. After being used in a vibrating environment for a period of time, the surface of the first terminal of the electrode terminal assembly may have a flatness difference on the side facing away from the electrode assembly. Utility Model Content

[0004] To address the related technical problems, the embodiments of this disclosure aim to provide a battery cell, a battery device, and an electrical device, so that the surface of the first terminal portion of the electrode terminal assembly maintains good flatness on the side of the first terminal portion away from the electrode assembly when used in a vibration environment.

[0005] The technical solution of this disclosure embodiment is implemented as follows:

[0006] The first aspect of this disclosure provides a battery cell, comprising:

[0007] The outer casing includes a first wall having a first through hole;

[0008] Electrode assembly, housed within the housing;

[0009] An electrode terminal assembly includes a first terminal portion, a second terminal portion, and a third terminal portion. The first terminal portion is located on the side of the first wall away from the electrode assembly, and the second terminal portion is located on the side of the first wall close to the electrode assembly. The second terminal portion is electrically connected to the electrode assembly. The third terminal portion is at least partially located within the first through hole. The third terminal portion is connected to both the first terminal portion and the second terminal portion. The first wall is partially installed between the first terminal portion and the second terminal portion.

[0010] An insulating element is at least partially disposed between the first terminal portion and the first wall, and a gap is formed between the insulating element and the first terminal portion.

[0011] In this embodiment, a gap is formed between the insulating member and the first terminal portion. This gap helps to alleviate the vibration and compression of the first terminal portion by the insulating member during the transportation and use of the battery cell, reducing surface warping on the side of the first terminal portion away from the electrode assembly. The gap between the insulating member and the first terminal portion provides space for pre-deformation of the first terminal portion. This reverse pre-deformation of the first terminal portion counteracts, as much as possible, the thermal deformation of the first terminal portion away from the electrode assembly caused by the heat source during installation, thereby ensuring that the surface of the first terminal portion away from the electrode assembly has better overall flatness.

[0012] In some embodiments, the gap has a first portion close to the first through hole and a second portion away from the first through hole, the first portion and the second portion being arranged in a direction that intersects the thickness direction of the first wall, and the height of the first portion is less than the height of the second portion in the thickness direction of the first wall.

[0013] In this embodiment of the disclosure, the different heights of the first part and the second part enable the insulating member to better support the pre-deformed first terminal part, reduce the degree of suspension of the pre-deformed first terminal part, and make the first terminal part produce a more suitable pre-deformation. This can better offset the thermal deformation of the first terminal part away from the electrode assembly caused by the heat source during the battery cell installation process, so that the surface of the first terminal part away from the electrode assembly has better flatness.

[0014] In some embodiments, the height of the gap in the thickness direction of the first wall gradually increases along the direction from the first portion of the gap to the second portion of the gap.

[0015] In this embodiment of the disclosure, by gradually changing the height of the gap, the first terminal portion can fit well with the insulating component after pre-deformation, and the insulating component can better support the first terminal portion after pre-deformation. This is beneficial for the first terminal portion to obtain a more suitable pre-deformation, thereby better offsetting the thermal deformation of the first terminal portion away from the electrode assembly caused by the heat source during the battery cell installation process, so that the surface of the first terminal portion away from the electrode assembly has a better overall flatness.

[0016] In some embodiments, the insulating member has a first surface on the side facing the gap, the first terminal portion has a second surface on the side facing the gap, the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall.

[0017] In this embodiment of the present disclosure, the inclination of the end of the first surface away from the first through hole toward the electrode assembly provides space for the end of the second surface away from the first through hole to inclination toward the electrode assembly. The inclination of the end of the second surface away from the first through hole toward the electrode assembly makes the current-carrying cross section of the first terminal portion larger, resulting in a smaller impedance from the third terminal portion through the first terminal portion to the busbar.

[0018] In some embodiments, the insulating member has a first surface on the side facing the gap, the first terminal portion has a second surface on the side facing the gap, the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the second surface is perpendicular to the thickness direction of the first wall.

[0019] In this embodiment, the first surface is inclined toward the electrode assembly from the end away from the first through hole, and the second surface is perpendicular to the thickness direction of the first wall, so that the gap has different heights in the first part and the second part. The second surface is perpendicular to the thickness direction of the first wall, and the entire surface of the first terminal portion facing the electrode assembly is basically on a plane, which facilitates the processing of the first terminal portion.

[0020] In some embodiments, the insulating member has a first surface on the side facing the gap, the first terminal portion has a second surface on the side facing the gap, the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined away from the electrode assembly along the thickness direction of the first wall.

[0021] In this embodiment, the gap between the first surface and the second surface is relatively large, which alleviates the warping of the surface of the first terminal portion away from the electrode assembly caused by the vibration and compression of the insulating member on the first terminal portion, resulting in better flatness of the surface of the first terminal portion away from the electrode assembly. The large gap between the first surface and the second surface allows for a larger pre-deformation of the first terminal portion during the pre-deformation process to contact the insulating member. This helps to offset the thermal deformation of the first terminal portion away from the electrode assembly under the influence of heat sources during battery cell installation, further ensuring better flatness of the surface of the first terminal portion away from the electrode assembly.

[0022] In some embodiments, the first surface is a plane, and the second surface is a plane.

[0023] In this embodiment of the present disclosure, since both the first surface and the second surface are planar, when the first terminal portion after pre-deformation contacts the insulating member, the first surface and the second surface can fit together as well as possible, so that the insulating member can better support the first terminal portion, and the first terminal portion can obtain a more suitable pre-deformation to offset the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process as much as possible, so that the surface of the first terminal portion away from the electrode assembly has a better overall flatness.

[0024] In some embodiments, the maximum height of the gap in the thickness direction of the first wall is 0.02 mm to 0.2 mm.

[0025] In this embodiment of the disclosure, the maximum height of the gap in the thickness direction of the first wall is within a suitable range, which reduces the entry of dust and debris between the insulating member and the first terminal portion, can alleviate the vibration and compression of the first wall and the first terminal portion, and can also provide a suitable pre-deformation space for the first terminal portion.

[0026] In some embodiments, the maximum height of the gap in the thickness direction of the first wall is 0.05 mm to 0.1 mm.

[0027] In this embodiment of the disclosure, the maximum height of the gap in the thickness direction of the first wall is within a suitable range, which reduces the entry of dust and debris between the insulating member and the first terminal portion, can alleviate the vibration and compression of the first wall and the first terminal portion, and can also provide a suitable pre-deformation space for the first terminal portion.

[0028] In some embodiments, the gap is disposed on at least one side of the third terminal portion along the length direction of the first terminal portion, and the first portion and the second portion are arranged along the length direction of the first terminal portion.

[0029] In this embodiment, the first terminal protrudes longer than the third terminal along its length, making it more susceptible to deformation. A gap is provided on at least one side of the third terminal along the length of the first terminal to alleviate vibration and pressure on the first terminal from the end of the insulating member away from the first through hole along its length. This reduces the degree of surface warping on the side of the first terminal away from the electrode assembly, resulting in a generally better flatness on the surface of the first terminal away from the electrode assembly. By pressing the end of the first terminal away from the first through hole against the insulating member along its length, appropriate pre-deformation can be generated more smoothly, thereby offsetting the thermal deformation of the corresponding end of the first terminal away from the electrode assembly under the influence of heat sources during battery cell installation. This results in a generally better flatness on the surface of the first terminal away from the electrode assembly. With the gap positioned on at least one side of the third terminal portion along the length direction of the first terminal portion, the first and second portions are arranged along the length direction of the first terminal portion. The second portion, which is farther from the first through hole along the length direction of the first terminal portion, has a larger height, providing a larger buffer space between the portion of the first terminal portion farther from the first through hole and the insulating member. This helps to alleviate the vibration and compression of the first terminal portion by the insulating member, resulting in better overall flatness on the surface of the first terminal portion facing away from the electrode assembly. By having different heights for the first and second portions arranged along the length direction of the first terminal portion, the insulating member can better support the pre-deformed first terminal portion at different positions along the length direction of the first terminal portion, reducing the degree of suspension of the pre-deformed first terminal portion at certain positions in the first direction. This allows the first terminal portion to undergo more appropriate pre-deformation, thereby better offsetting the thermal deformation of the first terminal portion facing away from the electrode assembly caused by the heat source during battery cell installation, resulting in better flatness on the surface of the first terminal portion facing away from the electrode assembly.

[0030] In some embodiments, the number of third terminal portions is at least two, at least one of the third terminal portions is a preset terminal portion, and all the third terminal portions except the preset terminal portion are located on the same side of the preset terminal portion along the length direction of the first terminal portion, and the gap is provided on the side of at least one preset terminal portion away from the other third terminal portions along the length direction of the first terminal portion.

[0031] In this embodiment, a gap is provided on the side of at least one preset terminal portion away from the remaining third terminal portions along the length direction of the first terminal portion, so that the first terminal portion partially protrudes outside the third terminal portions. This facilitates the insulation component to alleviate vibration and compression on the portion of the first terminal portion protruding outside the third terminal portions through the gap, reduces warping of the surface of the first terminal portion away from the electrode assembly, and gives the surface of the first terminal portion away from the electrode assembly a better overall flatness. The gap, located on the side of at least one preset terminal portion away from the remaining third terminal portions along the length direction of the first terminal portion, allows the first terminal portion to undergo a more suitable pre-deformation more smoothly, offsetting the thermal deformation of the first terminal portion away from the electrode assembly under the influence of heat sources during battery cell installation, thus giving the surface of the first terminal portion away from the electrode assembly a better overall flatness.

[0032] In some embodiments, the first terminal portion has a second through hole, and the third terminal portion has a limiting boss located in the second through hole at one end away from the electrode assembly. The limiting boss contacts at least a portion of the first terminal portion on one side of the first wall facing the electrode assembly in the thickness direction of the first wall. The first terminal portion has at least two first end faces arranged opposite each other along the length direction of the first terminal portion. Along the length direction of the first terminal portion, the minimum distance between one of the first end faces and the limiting boss and the minimum distance between the other first end face and the limiting boss are equal.

[0033] In this embodiment, the lengths of the first terminal portion extending beyond the third terminal portion on both sides along the length direction of the first terminal portion are relatively close, the pre-deformation on both sides along the length direction of the first terminal portion is relatively uniform, the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process is relatively uniform, and the pre-deformation and thermal deformation on both sides along the length direction of the first terminal portion are well offset, thereby giving the surface of the first terminal portion away from the electrode assembly a better overall flatness.

[0034] In some embodiments, the first terminal portion has a second through hole, and the third terminal portion has a limiting boss located in the second through hole at one end away from the electrode assembly. The limiting boss contacts at least a portion of the first terminal portion on the side facing the electrode assembly in the thickness direction of the first wall. The first terminal portion has at least two second end faces arranged opposite to each other in the width direction of the first terminal portion. In the width direction of the first terminal portion, the minimum distance between one of the second end faces and the limiting boss and the minimum distance between the other second end face and the limiting boss are equal.

[0035] In this embodiment, the widths of the first terminal portion extending beyond the third terminal portion on both sides along the width direction of the first terminal portion are relatively close, the pre-deformation on both sides of the first terminal portion along the width direction of the first terminal portion is relatively uniform, the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process is relatively uniform, and the pre-deformation and thermal deformation on both sides along the width direction of the first terminal portion are well offset, which is beneficial to improving the flatness of the surface of the first terminal portion away from the electrode assembly.

[0036] In some embodiments, the first terminal portion has a second through hole, and the third terminal portion has a limiting boss located in the second through hole at one end away from the electrode assembly. The limiting boss contacts at least part of the first terminal portion on the side of the first wall facing the electrode assembly in the thickness direction of the first wall. The first terminal portion has at least two second end faces arranged opposite each other in the width direction of the first terminal portion. The minimum distance between the limiting boss and each second end face in the width direction of the first terminal portion is 1.2 mm to 4.5 mm.

[0037] In this embodiment, the minimum distance between the limiting boss along the width direction of the first terminal portion and the second end face of each terminal portion is appropriate, so that the strength of both sides of the first terminal portion along the width direction of the first terminal portion is appropriate, and the pre-deformation of the first terminal portion along the length direction of the first terminal portion is appropriate, so as to better offset the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process, thereby making the surface of the first terminal portion away from the electrode assembly generally have better flatness.

[0038] In some embodiments, the minimum distance between the limiting boss and each of the second end faces along the width direction of the first terminal portion is 1.5mm to 3.5mm.

[0039] In this embodiment, the minimum distance between the limiting boss along the width direction of the first terminal portion and the second end face of each terminal portion is appropriate, so that the strength of both sides of the first terminal portion along the width direction of the first terminal portion is appropriate, and the pre-deformation of the first terminal portion along the length direction of the first terminal portion is appropriate, so as to better offset the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process, thereby making the surface of the first terminal portion away from the electrode assembly generally have better flatness.

[0040] In some embodiments, the length of the first terminal portion is 25mm to 70mm.

[0041] In this embodiment, the length of the first terminal portion is within a suitable range, and the pre-deformation of the first terminal portion along its length direction is appropriate to counteract the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process, thereby giving the surface of the first terminal portion away from the electrode assembly a better overall flatness.

[0042] In some embodiments, the first terminal portion is plate-shaped, and the thickness of the first terminal portion in the thickness direction of the first wall is 1.2 mm to 4 mm.

[0043] In this embodiment, the thickness of the first terminal portion in the thickness direction of the electrode assembly toward the first wall is within a suitable range, and the pre-deformation of the first terminal portion along the length direction of the first terminal portion is suitable to counteract the thermal deformation of the first terminal portion away from the electrode assembly under the influence of the heat source during the battery cell installation process, so that the surface of the first terminal portion away from the electrode assembly has a better overall flatness.

[0044] In some embodiments, the substrate of the first terminal portion is aluminum.

[0045] In this embodiment, the substrate of the first terminal is aluminum, which enables the first terminal to undergo a more suitable pre-deformation, so as to better offset the thermal deformation of the first terminal away from the electrode assembly caused by the heat source during the battery cell installation process, thereby making the surface of the first terminal away from the electrode assembly generally have better flatness.

[0046] In some embodiments, the surface of the first terminal portion facing away from the electrode assembly is a preset surface, and the preset surface is a plane.

[0047] In this embodiment, the preset surface is a plane, the preset surface is relatively flat, and the flatness of the side of the first terminal portion away from the electrode assembly is better.

[0048] In some embodiments, the second terminal portion is welded to the electrode assembly.

[0049] In this embodiment of the present disclosure, the second terminal portion is welded to the electrode assembly to achieve electrical connection between the second terminal portion and the electrode assembly. The heat generated by welding causes the pre-deformed first terminal portion to undergo thermal deformation away from the electrode assembly, so that the surface of the pre-deformed first terminal portion away from the electrode assembly is restored to a relatively flat state through thermal deformation, thereby giving the surface of the first terminal portion away from the electrode assembly a better overall flatness.

[0050] In some embodiments, the housing includes:

[0051] case;

[0052] An end cap is connected to the housing, the electrode assembly is located within the space enclosed by the housing and the end cap, the first wall is formed in the end cap, and the insulating member is located between the first terminal portion and the end cap.

[0053] In this embodiment, the housing and end cap are fitted together to facilitate the assembly of individual battery cells.

[0054] A second aspect of this disclosure provides a battery device, comprising:

[0055] Box;

[0056] The battery cells described above are installed in the housing.

[0057] In this embodiment, a gap is formed between the insulating member and the first terminal portion. This gap helps to alleviate the vibration and compression of the first terminal portion by the insulating member during the transportation and use of the battery cell, reducing surface warping on the side of the first terminal portion away from the electrode assembly. The gap between the insulating member and the first terminal portion provides space for pre-deformation of the first terminal portion. This reverse pre-deformation of the first terminal portion counteracts, as much as possible, the thermal deformation of the first terminal portion away from the electrode assembly caused by the heat source during installation, thereby ensuring that the surface of the first terminal portion away from the electrode assembly has better overall flatness.

[0058] A third aspect of this disclosure provides an electrical device, comprising:

[0059] Main body of the device;

[0060] The battery device described above is mounted on the main body of the device.

[0061] In this embodiment, a gap is formed between the insulating member and the first terminal portion. This gap helps to alleviate the vibration and compression of the first terminal portion by the insulating member during the transportation and use of the battery cell, reducing surface warping on the side of the first terminal portion away from the electrode assembly. The gap between the insulating member and the first terminal portion provides space for pre-deformation of the first terminal portion. This reverse pre-deformation of the first terminal portion counteracts, as much as possible, the thermal deformation of the first terminal portion away from the electrode assembly caused by the heat source during installation, thereby ensuring that the surface of the first terminal portion away from the electrode assembly has better overall flatness.

[0062] The battery cell provided in this disclosure has a gap between the insulating component and the first terminal portion. During battery cell transportation and use, this gap can alleviate vibration and compression of the first terminal portion by the insulating component, reduce surface warping on the side of the first terminal portion away from the electrode assembly, and ensure that the surface of the first terminal portion away from the electrode assembly has good overall flatness. When a heat source exists during battery cell installation that causes thermal deformation of the first terminal portion away from the electrode assembly, the gap between the insulating component and the first terminal portion provides space for pre-deformation. Before installation, the first terminal portion is pre-deformed towards the insulating component to make contact with it. The heat generated by the heat source during battery cell installation is transferred to the pre-deformed first terminal portion, causing thermal deformation away from the electrode assembly. This reverse pre-deformation of the first terminal portion counteracts the thermal deformation caused by the heat source during installation, thus ensuring that the surface of the first terminal portion away from the electrode assembly has good overall flatness. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this disclosure;

[0064] Figure 2 for Figure 1 Sectional view at point AA;

[0065] Figure 3 for Figure 2 Enlarged view at point B;

[0066] Figure 4 This is a schematic diagram of the insulating structure of a battery cell according to an embodiment of the present disclosure;

[0067] Figure 5 This is a partial structural diagram of a battery cell according to an embodiment of the present disclosure, where the casing and electrode assembly are not shown.

[0068] Figure 6 This is a schematic diagram of the structure of the first terminal portion according to an embodiment of the present disclosure. The figure shows that the first terminal portion is a composite of a copper plate and an aluminum plate.

[0069] Figure 7 This is a schematic diagram of the structure in which a gap is formed between the first terminal portion and the insulating member according to an embodiment of the present disclosure. The diagram shows that the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the second surface is perpendicular to the thickness direction of the first wall.

[0070] Figure 8This is a schematic diagram of the structure in which a gap is formed between the first terminal portion and the insulating member according to an embodiment of the present disclosure. The diagram shows that the end of the second surface away from the first through hole is inclined away from the electrode assembly along the thickness direction of the first wall, and the first surface is perpendicular to the thickness direction of the first wall.

[0071] Figure 9 This is a schematic diagram of the structure in which a gap is formed between the first terminal portion and the insulating member according to an embodiment of the present disclosure. The diagram shows that the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall.

[0072] Figure 10 This is a schematic diagram of the structure in which a gap is formed between the first terminal portion and the insulating member according to an embodiment of the present disclosure. The diagram shows that the end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined away from the electrode assembly along the thickness direction of the first wall.

[0073] Figure 11 This is a schematic diagram of the structure of the third terminal portion according to an embodiment of the present disclosure. The figure shows that there are three third terminal portions.

[0074] Figure 12 This is a schematic diagram of the assembly of the third terminal portion and the insulating member according to an embodiment of this disclosure;

[0075] Figure 13 This is a schematic diagram of the structure of the first terminal portion in the related technology. The diagram shows that the side of the first terminal portion facing away from the electrode assembly is raised.

[0076] Explanation of reference numerals in the attached figures

[0077] 1. Outer shell; 11. Housing; 12. End cap; 13. First wall; 131. First through hole; 2. Electrode terminal assembly; 21. Second terminal portion; 22. First terminal portion; 221. Second through hole; 222. First sub-hole; 223. Second sub-hole; 224. Second surface; 225. Protruding ring; 2251. Contact surface; 226. Copper plate; 227. Aluminum plate; 228. First end face; 229. Second end face; 230. Preset surface; 23. Third terminal portion; 231. Preset terminal portion; 232. Limiting boss; 233. First boundary line; 234. Second boundary line; 3. Insulating component; 31. First surface; 4. Electrode assembly; 5. Lower plastic; 6. Gap; 61. First part; 62. Second part; R1. Thickness direction of the first wall; R2. Width direction of the first terminal portion; R3. Length direction of the first terminal portion. Detailed Implementation

[0078] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative and should not be construed as limiting the scope of protection of this disclosure.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and foregoing description of the drawings of this disclosure are intended to cover non-exclusive inclusion.

[0080] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "at least two" means two or more, unless otherwise explicitly specified.

[0081] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0082] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0083] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0084] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0085] In related technologies, the casing of a battery cell includes a first wall, and the electrode terminal assembly of the battery cell includes a second terminal portion, a third terminal portion, and a first terminal portion. The first terminal portion is located on the side of the first wall away from the electrode assembly, and the second terminal portion is located on the side of the first wall close to the electrode assembly. The second terminal portion is connected to the electrode assembly, and the third terminal portion is connected to both the second and first terminal portions to transmit current. The first terminal portion is electrically connected to an external conductor. For example, the first terminal portion makes surface contact with a busbar to achieve electrical connection for connecting at least two battery cells in series, parallel, or mixed connections. Mixed connections refer to at least two battery cells being connected in both series and parallel connections. An insulating member is provided between the first terminal portion and the first wall to limit the current transmission from the first terminal portion to the casing. The first terminal portion is in close contact with the insulating member, with almost no gap between them. During vibration of the battery cell, the vibration is directly transmitted to the first terminal portion through the first wall and the insulating member. The surface of the first terminal portion away from the electrode assembly warps under vibration, resulting in a poor flatness of the surface of the first terminal portion away from the electrode assembly.

[0086] For example, please see Figure 13 The surface of the first terminal portion facing away from the electrode assembly is raised to form an angle, resulting in poor overall flatness of the surface of the first terminal portion facing away from the electrode assembly.

[0087] In this embodiment of the battery cell, a first terminal portion 22 is located on the side of the first wall 13 away from the electrode assembly 4, a second terminal portion 21 is located on the side of the first wall 13 close to the electrode assembly 4, and a third terminal portion 23 is connected to both the first terminal portion 22 and the second terminal portion 21. A gap 6 is formed between the insulating member 3 and the first terminal portion 22. The gap 6 can alleviate the vibration and compression of the first terminal portion 22 by the insulating member 3 during the transportation and use of the battery cell, and reduce the surface warping of the first terminal portion 22 on the side away from the electrode assembly 4. The gap 6 between the insulating member 3 and the first terminal portion 22 can provide space for pre-deformation of the first terminal portion 22. The reverse pre-deformation of the first terminal portion 22 can offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during the installation process as much as possible, thereby making the surface of the first terminal portion 22 on the side away from the electrode assembly 4 have better overall flatness.

[0088] The battery cells of this disclosure can be applied to battery devices, and the battery devices can be applied to electrical devices.

[0089] This disclosure provides a battery device, which includes a housing and individual battery cells, with the individual battery cells mounted in the housing.

[0090] The battery device can be a battery pack or an energy storage device.

[0091] A battery pack may include at least two battery cells, which may be connected in series, parallel, or a combination thereof. A combination thereof means that at least two battery cells are connected in both series and parallel. At least two battery cells may be directly connected in series, parallel, or a combination thereof, and then the assembly of the at least two battery cells is placed in a housing. The battery device may also include other structures; for example, the battery device may also include a busbar for achieving electrical connection between the at least two battery cells.

[0092] Energy storage devices are devices that store electrical energy. Examples include energy storage cabinets or energy storage containers.

[0093] This disclosure provides an electrical device, which includes a device body and a battery device, with the battery device installed on the device body.

[0094] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0095] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0096] The following description will be based on an embodiment of the present disclosure, using a vehicle as the electrical device and a battery pack as the battery device.

[0097] One embodiment of this disclosure provides a vehicle that can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery pack is installed inside the vehicle, and the battery pack can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, and the controller can be used to control the battery pack to power the motor. For example, the battery pack can be used to meet the vehicle's power needs during starting, navigation, and driving.

[0098] In some embodiments, the battery pack can serve not only as the operating power source for the vehicle, but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0099] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0100] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0101] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0102] For example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0103] For example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For instance, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0104] Exemplarily, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this disclosure is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co The following are included: 0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0105] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0106] For example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For instance, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0107] For example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0108] For example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0109] Exemplarily, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. Exemplarily, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this disclosure is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0110] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0111] For example, negative electrode active material may be filled or / and deposited in the negative electrode current collector.

[0112] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0113] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0114] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0115] For example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0116] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0117] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0118] Liquid electrolytes include electrolyte salts and solvents.

[0119] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0120] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0121] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0122] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0123] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0124] For example, the polymer of the polymer solid electrolyte may include polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid, cellulose, etc.

[0125] For example, the inorganic solid electrolyte can be one or more of the following: oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolyte (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfide), halide solid electrolyte, nitride solid electrolyte and hydride solid electrolyte.

[0126] For example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0127] For example, multiple positive and negative electrodes can be provided, and multiple positive and multiple negative electrodes can be stacked alternately.

[0128] For example, multiple positive electrode sheets can be provided, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0129] For example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0130] For example, multiple separators may be provided, each disposed between any adjacent positive or negative electrode plates.

[0131] For example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0132] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0133] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0134] This disclosure provides an embodiment of a battery cell; please refer to [link to relevant documentation]. Figures 1-5 The battery cell includes a housing 1, an electrode assembly 4, an electrode terminal assembly 2, and an insulating member 3. The housing 1 includes a first wall 13 with a first through hole 131. The electrode assembly 4 is housed within the housing 1. The electrode terminal assembly 2 includes a first terminal portion 22, a second terminal portion 21, and a third terminal portion 23. The first terminal portion 22 is located on the side of the first wall 13 away from the electrode assembly 4. The second terminal portion 21 is located on the side of the first wall 13 close to the electrode assembly 4 and is electrically connected to the electrode assembly 4. The third terminal portion 23 is at least partially located within the first through hole 131 and is connected to the first terminal portion 22 and the second terminal portion 21, respectively. The first wall 13 is partially installed between the first terminal portion 22 and the second terminal portion 21. The insulating member 3 is at least partially disposed between the first terminal portion 22 and the first wall 13, forming a gap 6 between the insulating member 3 and the first terminal portion 22.

[0135] The third terminal 23 is connected to the first terminal 22 and the second terminal 21 respectively, thereby realizing the electrical connection between the third terminal 23 and the first terminal 22, and the electrical connection between the third terminal 23 and the second terminal 21.

[0136] A gap 6 is formed between the insulating member 3 and the first terminal portion 22 so that at least a portion of the outer contour of the first terminal portion 22 is spaced apart from the insulating member 3 by a certain distance in the thickness direction R1 of the first wall 13.

[0137] The outer contour of the first terminal portion 22 surrounds the outside of the first terminal portion 22 along the circumference of the first through hole 131. The first terminal portion 22 is located within the area enclosed by the outer contour of the first terminal portion 22.

[0138] The outer casing 1 can be a sealed structure or a non-sealed structure. For example, when the outer casing 1 is a non-sealed structure, it serves to protect the electrode assembly 4. A sealing bag is also included between the outer casing 1 and the electrode assembly 4, and the sealing bag is used to encapsulate the electrode assembly 4 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0139] The electrode assembly 4 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0140] The electrode assembly 4 includes a positive electrode, a negative electrode, and an insulating component. The positive electrode, negative electrode, and insulating component are wound together into a wound structure.

[0141] For example, electrode terminal assembly 2 is a pole post.

[0142] For example, the number of electrode terminal assemblies 2 is at least two, one of which has a positive polarity and the other has a negative polarity.

[0143] For example, the number of electrode terminal assemblies 2 can be one, with the polarity of the electrode terminal assembly 2 being positive and the polarity of the housing 1 being negative; or the polarity of the electrode terminal assembly 2 being negative and the polarity of the housing 1 being positive.

[0144] For example, the insulating element 3 is made of plastic.

[0145] For example, the third terminal portion 23 is arranged at a distance from the outer contour of the first terminal portion 22, and the third terminal portion 23 is located in the area enclosed by the outer contour of the first terminal portion 22.

[0146] For example, the third terminal portion 23 is spaced apart from the outer contour of the insulating member, and the third terminal portion 23 is located in the area enclosed by the outer contour of the first terminal portion 22.

[0147] For example, the busbar is welded to the side surface of the first terminal portion 22 opposite to the electrode assembly 4.

[0148] In this embodiment, a gap 6 is formed between the insulating member 3 and the first terminal portion 22. During the transportation and use of the battery cell, the vibration and compression of the first terminal portion 22 by the insulating member 3 can be alleviated, the surface warping of the first terminal portion 22 away from the electrode assembly 4 can be reduced, and the surface of the first terminal portion 22 away from the electrode assembly 4 can have better overall flatness. When there is a heat source during the installation of the battery cell, which causes the first terminal portion 22 to undergo thermal deformation away from the electrode assembly 4, the gap 6 between the insulating member 3 and the first terminal portion 22 can provide space for pre-deformation of the first terminal portion 22. Before installation, the first terminal portion 22 is pre-deformed towards the insulating member 3 so that the first terminal portion 22 contacts the insulating member 3. The heat generated by the heat source during the installation of the battery cell is transferred to the pre-deformed first terminal portion 22, causing the pre-deformed first terminal portion 22 to undergo thermal deformation away from the electrode assembly 4. The reverse pre-deformation of the first terminal portion 22 is used to offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during the installation process as much as possible, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has a better overall flatness.

[0149] In some embodiments, the second terminal portion 21 is welded to the electrode assembly 4.

[0150] It should be noted that the second terminal portion 21 is welded to the electrode assembly 4, and the second terminal portion 21 is further welded to the electrode lug of the electrode assembly 4. The heat generated during the welding process forms a heat source, causing the first terminal portion 22 to undergo thermal deformation.

[0151] In this embodiment of the present disclosure, the second terminal portion 21 is welded to the electrode assembly 4 to achieve electrical connection between the second terminal portion 21 and the electrode assembly 4. The heat generated by welding causes thermal deformation on the side of the pre-deformed first terminal portion 22 away from the electrode assembly 4, so that the surface of the pre-deformed first terminal portion 22 away from the electrode assembly 4 is restored to a relatively flat state through thermal deformation, thereby giving the surface of the first terminal portion 22 away from the electrode assembly 4 a better overall flatness.

[0152] It is understood that the specific form of the heat source is not limited. For example, it can be any heat source other than the heat generated during the assembly of the battery cell, except for the heat generated by welding the second terminal 21 to the electrode assembly 4.

[0153] In some embodiments, please refer to Figures 7-11The gap 6 has a first part 61 close to the first through hole 131 and a second part 62 away from the first through hole 131. The arrangement direction of the first part 61 and the second part 62 is intersected with the thickness direction of the first wall 13. In the thickness direction R1 of the first wall 13, the height of the first part 61 is less than the height of the second part 62.

[0154] It should be noted that the first part 61 and the second part 62 are relative concepts. Two parts with different heights along the thickness direction R1 of the first wall 13 are arbitrarily circled on the gap 6. Among the two circled gaps 6, the smaller gap 6 is the first part 61, which is closer to the first through hole 131, and the larger gap 6 is the second part 62, which is farther away from the first through hole 131.

[0155] It should be noted that the arrangement direction of the first part 61 and the second part 62 is an intersection with the thickness direction of the first wall 13.

[0156] For example, the first portion 61 and the second portion 62 are arranged along the length direction R3 of the first terminal portion 22.

[0157] For example, the length direction R3 of the first terminal portion 22 is perpendicular to the thickness direction R1 of the first wall 13.

[0158] For example, the first portion 61 and the second portion 62 are arranged along the width direction R2 of the first terminal portion 22.

[0159] For example, the width direction R2 of the first terminal portion 22 is perpendicular to the thickness direction R1 of the first wall 13.

[0160] In this embodiment, the arrangement direction of the first part 61 and the second part 62 is intersecting the thickness direction of the first wall 13. In the thickness direction R1 of the first wall 13, the height of the first part 61 is less than the height of the second part 62. The vibration amplitude of the first terminal portion 22 located away from the first through hole 131 is larger. Since the second part 62, located away from the first through hole 131, has a larger height, it can provide a larger buffer space, alleviating the warping of the first terminal portion 22 under the vibration and compression of the insulating member 3. The difference in height between the first part 61 and the second part 62 allows the insulating member 3 to better support the pre-deformed first terminal portion 22, reducing the degree of suspension of the pre-deformed first terminal portion 22. This allows the first terminal portion 22 to undergo a more suitable pre-deformation, thereby better offsetting the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during battery cell installation, and ensuring that the surface of the first terminal portion 22 on the side away from the electrode assembly 4 has better flatness.

[0161] It is understood that, in the thickness direction R1 of the first wall 13, the height of the first portion 61 is not necessarily less than the height of the second portion 62. For example, in the thickness direction R1 of the first wall 13, the height of the first portion 61 is equal to the height of the second portion 62.

[0162] In some embodiments, please refer to Figures 7-11 The height of the gap 6 in the thickness direction R1 of the first wall 13 gradually increases along the direction from the first part 61 of the gap 6 to the second part 62 of the gap 6.

[0163] It should be noted that the height of the gap 6 in the thickness direction R1 of the first wall 13 can be obtained by measuring it with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell is not powered off and not in operation.

[0164] It should be noted that the closer the gap 6 is to the first through hole 131, the smaller the height of the gap 6 in the thickness direction R1 of the first wall 13; the farther the gap 6 is from the first through hole 131, the greater the height of the gap 6 in the thickness direction R1 of the first wall 13. The height of the gap 6 is gradual and does not change in a step-like manner.

[0165] In this embodiment, the height of the gap 6 in the thickness direction R1 of the first wall 13 gradually increases along the direction from the first part 61 of the gap 6 to the second part 62 of the gap 6. The height of the gap 6 gradually changes. During the process of the first terminal portion 22 pre-deforming towards the insulating member 3 to make the first terminal portion 22 contact the insulating member 3, the deformation of the first part 61 near the first through hole 131 is smaller, while the deformation of the second part 62 away from the first through hole 131 is larger. The deformation of the first terminal portion 22 gradually increases from the first part 61 to the second part 62. Through the gradual change in the height of the gap 6, there is almost no abrupt change in the height of the gap 6. After pre-deformation, the first terminal portion 22 can fit well with the insulating member 3, and the insulating member 3 can better support the pre-deformed first terminal portion 22. This is beneficial for the first terminal portion 22 to obtain a more suitable pre-deformation, thereby better offsetting the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during the battery cell installation process. This results in the surface of the first terminal portion 22 on the side away from the electrode assembly 4 having better overall flatness.

[0166] In some embodiments, the insulating member 3 has at least two stepped surfaces on the side facing the gap 6, the gap 6 is located between the stepped surfaces and the first terminal portion 22, and in two adjacent stepped surfaces, the distance between the first terminal portion 22 and the stepped surface near the first through hole 131 is less than the distance between the first terminal portion 22 and the stepped surface away from the first through hole 131.

[0167] It should be noted that, in two adjacent stepped surfaces, the portion of the gap 6 between the first terminal portion 22 and the stepped surface near the first through hole 131 is the first portion 61, and the portion of the gap 6 between the first terminal portion 22 and the stepped surface away from the first through hole 131 is the second portion 62.

[0168] In some embodiments, please refer to Figure 9 The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6. The end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the end of the second surface 224 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0169] The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6, with the gap 6 formed between the first surface 31 and the second surface 224.

[0170] The end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13. The end of the second surface 224 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13. The inclination direction of the end of the first surface 31 away from the first through hole 131 is the same as the inclination direction of the end of the second surface 224 away from the first through hole 131.

[0171] In this embodiment, the inclination of the end of the first surface 31 away from the first through hole 131 toward the electrode assembly 4 provides space for the end of the second surface 224 away from the first through hole 131 to incline toward the electrode assembly 4. The inclination of the end of the second surface 224 away from the first through hole 131 toward the electrode assembly 4 makes the current-carrying cross section of the first terminal portion 22 larger, and the impedance from the third terminal portion 23 through the first terminal portion 22 to the busbar smaller.

[0172] In some embodiments, please refer to Figure 7 The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6. The end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the second surface 224 is perpendicular to the thickness direction R1 of the first wall 13.

[0173] For example, the first terminal portion 22 is generally flat in shape, and the thickness of the first terminal portion 22 is substantially equal at each position.

[0174] In this embodiment, the first surface 31 is inclined toward the electrode assembly 4 at one end away from the first through hole 131, and the second surface 224 is perpendicular to the thickness direction R1 of the first wall 13, so that the gap 6 has different heights in the first part 61 and the second part 62. The second surface 224 is perpendicular to the thickness direction R1 of the first wall 13, and the entire surface of the first terminal part 22 facing the electrode assembly 4 is basically on a plane, which facilitates the processing of the first terminal part 22.

[0175] In some embodiments, please refer to Figure 10 The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6. The end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0176] The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6, forming a gap between the first surface 31 and the second surface 224.

[0177] The end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13. The inclination directions of the end of the first surface 31 away from the first through hole 131 and the end of the second surface 224 away from the first through hole 131 are opposite.

[0178] In this embodiment, the end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13. The inclination directions of the first surface 31 and the second surface 224 are opposite, and the gap 6 between the first surface 31 and the second surface 224 is relatively large, so that the first terminal portion 22 can be better separated from the insulating member 3, and the warping of the surface of the first terminal portion 22 away from the electrode assembly 4 caused by the vibration and compression of the insulating member 3 on the first terminal portion 22 is alleviated, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has better flatness. The first surface 31 and the second surface 224 are tilted in opposite directions. The gap 6 between the first surface 31 and the second surface 224 is relatively large. During the process of the first terminal portion 22 undergoing pre-deformation to contact the insulating member 3, the first terminal portion 22 can have a large amount of pre-deformation, which can offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process as much as possible, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has better flatness.

[0179] In some embodiments, please refer to Figure 8 and Figure 10 The first terminal portion 22 has a second surface 224 on the side facing the gap 6. The end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0180] For example, the first surface 31 is perpendicular to the thickness direction R1 of the first wall 13.

[0181] The first terminal portion 22 has a second surface 224 on the side facing the gap 6, and the second surface 224 is located on the side of the gap 6 away from the electrode assembly 4.

[0182] In this embodiment, the second surface 224 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13 at one end away from the first through hole 131, so that the height of the gap increases from the end near the first through hole 131 to the end away from the first through hole 131. The first terminal portion 22 is a conductor that can conduct electricity. Compared with processing an inclined slope on the insulating member 3, it is easier to process an inclined slope on a conductive conductor.

[0183] In some embodiments, please refer to Figure 7 The first surface 31 is a plane, and the second surface 224 is a plane.

[0184] For example, one end of the first surface 31 away from the first through hole 131 is inclined toward the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0185] For example, the end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0186] It should be noted that the first surface 31 being a plane means that the maximum height difference of the first surface 31 in the direction perpendicular to the first surface 31 is 0 to 0.1 mm.

[0187] It should be noted that the second surface 224 being a plane means that the maximum height difference of the second surface 224 in the direction perpendicular to the second surface 224 is 0 to 0.1 mm.

[0188] In this embodiment, both the first surface 31 and the second surface 224 are planar, so that when the pre-deformed first terminal portion 22 contacts the insulating member 3, the first surface 31 and the second surface 224 can fit together as well as possible, so that the insulating member 3 can better support the first terminal portion 22, and the first terminal portion 22 can obtain a more suitable pre-deformation to offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process as much as possible, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has a better overall flatness.

[0189] In some embodiments, the first surface 31 is a plane and the second surface 224 is a plane; the end of the second surface 224 away from the first through hole 131 is inclined away from the electrode assembly 4 along the thickness direction R1 of the first wall 13, and the end of the first surface 31 away from the first through hole 131 is inclined towards the electrode assembly 4 along the thickness direction R1 of the first wall 13.

[0190] In some embodiments, the first surface 31 is a stepped surface.

[0191] In some embodiments, the second surface 224 is a stepped surface.

[0192] In some embodiments, please refer to Figure 3 and Figure 8 The maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.02mm to 0.2mm.

[0193] For example, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is shown by dimension H in the figure.

[0194] It should be noted that the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell is not powered off and not in operation.

[0195] For example, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.02mm, 0.03mm, 0.08mm, 0.1mm, 0.15mm, or 0.2mm.

[0196] In this embodiment, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.02mm to 0.2mm. The maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is within a suitable range. The height of the gap 6 is not too large, which reduces the entry of dust and debris between the insulating member 3 and the first terminal portion 22. The height of the gap 6 is not too small, which can alleviate the vibration and compression of the insulating member 3 on the first terminal portion 22, and also provide a suitable pre-deformation space for the first terminal portion 22.

[0197] It is understood that the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is not limited to 0.02mm to 0.2mm. For example, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is less than 0.02mm. For example, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is greater than 0.2mm.

[0198] In some embodiments, please refer to Figure 3 and Figure 8 The maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.05mm to 0.1mm.

[0199] For example, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.05 mm, 0.06 mm, 0.07 mm, 0.09 mm or 0.1 mm.

[0200] In this embodiment, the maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.05mm to 0.1mm. The maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is within a suitable range. The height of the gap 6 is not too large, which reduces the entry of dust and debris between the insulating member 3 and the first terminal portion 22. The height of the gap 6 is not too small, which can alleviate the vibration and compression of the insulating member 3 on the first terminal portion 22, and also provide a suitable pre-deformation space for the first terminal portion 22.

[0201] In some embodiments, please refer to Figures 1-4 The gap 6 is provided on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, and the first portion 61 and the second portion 62 are arranged along the length direction R3 of the first terminal portion 22.

[0202] For example, the gap 6 is provided on one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22.

[0203] For example, there are two gaps 6, which are respectively provided on opposite sides of the third terminal portion 23 along the length direction R3 of the first terminal portion 22. That is, a gap 6 is provided on one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, and a gap 6 is provided on the other side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22.

[0204] It should be noted that, among all the straight lines projected along the thickness direction R1 of the first wall 13 that coincide with the points on the projected outline of the third terminal portion 23 and are perpendicular to the length direction R3 of the first terminal portion 22, two of these straight lines are first boundary lines 233. All projected areas of the third terminal portion 23 along the length direction R3 of the first terminal portion 22 are located between these two first boundary lines 233. A gap 6 is provided on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, that is, at least one of the first boundary lines 233 has a gap 6 on the side along the length direction R3 of the first terminal portion 22 away from the projected area of ​​the third terminal portion 23.

[0205] In this embodiment, the first terminal portion 22 protrudes longer than the third terminal portion 23 in the length direction R3 of the first terminal portion 22, making the first terminal portion 22 more likely to deform. The gap 6 is provided on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, so that the end of the insulating member 3 facing away from the first through hole 131 in the length direction R3 of the first terminal portion 22 can be separated from the first terminal portion 22 as much as possible through the gap 6. This alleviates the vibration and compression of the first terminal portion 22 by the end of the insulating member facing away from the first through hole 131 in the length direction 3, reduces the degree of surface warping of the side of the first terminal portion 22 facing away from the electrode assembly 4, and makes the surface of the side of the first terminal portion 22 facing away from the electrode assembly 4 have better overall flatness. The first terminal portion 22 protrudes longer than the third terminal portion 23 in the length direction R3 of the first terminal portion 22, making the first terminal portion 22 more likely to deform. By pressing the end of the first terminal portion 22 away from the first through hole 131 in the length direction R3 of the first terminal portion 22 against the insulating member 3, a suitable pre-deformation can be generated relatively smoothly. This counteracts the thermal deformation of the corresponding end of the first terminal portion 22 in the length direction R3 of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the installation of the battery cell, so that the surface of the side of the first terminal portion 22 away from the electrode assembly 4 has a better overall flatness. With the gap 6 located on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, the first portion 61 and the second portion 62 are arranged along the length direction R3 of the first terminal portion 22. The second portion 62, which is farther away from the first through hole 131 along the length direction R3 of the first terminal portion 22, has a larger height, which makes the portion of the first terminal portion 22 that is farther away from the first through hole 131 along the length direction R3 of the first terminal portion 22 have a larger buffer space with the insulating member 3. This helps to alleviate the vibration and compression of the first terminal portion 22 by the insulating member 3, and makes the surface of the first terminal portion 22 facing away from the electrode assembly 4 have a better overall flatness.With the gap 6 located on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22, the first portion 61 and the second portion 62 are arranged along the length direction R3 of the first terminal portion 22. The second portion 62, which is farther away from the first through hole 131 along the length direction R3 of the first terminal portion 22, has a larger height. By having different heights for the first portion 61 and the second portion 62 arranged along the length direction R3 of the first terminal portion 22, the insulating member 3 can better support the pre-deformed first terminal portion 22 at different positions along the length direction R3 of the first terminal portion 22, reducing the degree of suspension of the pre-deformed first terminal portion 22 at some positions along the thickness direction R1 of the first wall 13, so that the first terminal portion 22 can produce a more suitable pre-deformation, thereby better offsetting the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during the battery cell installation process, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has better flatness.

[0206] It is understood that the gap 6 is not limited to being provided on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22. Exemplarily, the gap 6 is provided on at least one side of the third terminal portion 23 along the width direction R2 of the first terminal portion 22.

[0207] It should be noted that there are at least two third terminal portions 23. Among all the straight lines projected along the thickness direction R1 of the first wall 13, coinciding with points on the projected outline of all third terminal portions 23 and perpendicular to the width direction R2 of the first terminal portion 22, the two lines furthest apart are the second boundary lines 234. The projection areas of all third terminal portions 23 along the width direction R2 of the first terminal portion 22 are located between the two second boundary lines 234. A gap 6 is provided on at least one side of the third terminal portion 23 along the width direction R2 of the first terminal portion 22, that is, at least one of the second boundary lines 234 has a gap 6 on the side of the first terminal portion 22 away from the projection area of ​​the third terminal portion 23.

[0208] It is understood that the first portion 61 and the second portion 62 are not limited to being arranged along the length direction R3 of the first terminal portion 22. Exemplarily, the first portion 61 and the second portion 62 are arranged along the width direction R2 of the first terminal portion 22.

[0209] In some embodiments, please refer to Figure 11 and Figure 12The number of third terminal portions 23 is at least two, and at least one third terminal portion 23 is a preset terminal portion 231. Except for the preset terminal portion 231, all other third terminal portions 23 are located on the same side of the preset terminal portion 231 along the length direction R3 of the first terminal portion 22. The gap 6 is provided on the side of at least one preset terminal portion 231 away from the other third terminal portions 23 along the length direction R3 of the first terminal portion 22.

[0210] It should be noted that, among all the straight lines projected along the thickness direction R1 of the first wall 13 that coincide with the points on the projection outline of the preset terminal portion 231 and are perpendicular to the length direction R3 of the first terminal portion 22, the two lines furthest apart are the first boundary lines 233. The projection areas of all third terminal portions 23 are located between the two first boundary lines 233. The projection areas of all gaps 6 are located along the length direction R3 of the first terminal portion 22 on the side of the two boundary lines away from the projection area of ​​the preset terminal portion 231. The projection area of ​​gaps 6 is not located between the two first boundary lines 233.

[0211] For example, the number of third terminal portions 23 is two, three, or four.

[0212] For example, there are two preset terminal portions 231 and two gaps 6. The gaps 6 are respectively provided on the side of each preset terminal portion 231 away from the other third terminal portions 23 along the length direction R3 of the first terminal portion 22. That is, one preset terminal portion 231 is provided with a gap 6 on the side of the first terminal portion 22 away from the other third terminal portions 23 along the length direction R3 of the first terminal portion 22, and the other preset terminal portion 231 is provided with a gap 6 on the side of the first terminal portion 22 away from the other third terminal portions 23 along the length direction R3 of the first terminal portion 22.

[0213] For example, the gap 6 is provided on one side of a preset terminal portion 231 away from the remaining third terminal portion 23 along the length direction R3 of the first terminal portion 22.

[0214] In this embodiment, a gap 6 is provided on the side of at least one preset terminal portion 231 away from the remaining third terminal portions 23 along the length direction R3 of the first terminal portion 22, so that the first terminal portion 22 is partially suspended outside the third terminal portions 23. This facilitates the insulation member 3 to alleviate the vibration and compression on the portion of the first terminal portion 22 that is suspended outside the third terminal portion 23 through the gap 6, reducing the warping of the surface of the first terminal portion 22 away from the electrode assembly 4, and making the surface of the first terminal portion 22 away from the electrode assembly 4 generally have better flatness. The gap 6 being provided on the side of at least one preset terminal portion 231 away from the remaining third terminal portions 23 along the length direction R3 of the first terminal portion 22, so that the first terminal portion 22 is partially suspended outside the third terminal portions 23, allows the first terminal portion 22 to generate a more suitable pre-deformation more smoothly, to offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of heat sources during the battery cell installation process, thereby making the surface of the first terminal portion 22 away from the electrode assembly 4 generally have better flatness.

[0215] It is understood that the number of third terminal portions 23 is not limited to at least two. For example, the number of third terminal portions 23 is one.

[0216] In some embodiments, please refer to Figures 1-4 The first terminal portion 22 has a second through hole 221, and the third terminal portion 23 has a limiting boss 232 located in the second through hole 221 at one end away from the electrode assembly 4. The limiting boss 232 is in at least partial contact with the first terminal portion 22 on the side of the first wall 13 facing the electrode assembly 4 in the thickness direction R1. The first terminal portion 22 has at least two first end faces 228 arranged opposite to each other along the length direction R3 of the first terminal portion 22. Along the length direction R3 of the first terminal portion 22, the minimum distance between one of the first end faces 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 are equal.

[0217] It should be noted that, along the length direction R3 of the first terminal portion 22, the minimum distance between the first end face 228 and the limiting boss 232 is the minimum distance from the first end face 228 to the outermost contour of the limiting boss 232.

[0218] It should be noted that, along the length direction R3 of the first terminal portion 22, the minimum distance between one first end face 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 are equal means that, along the length direction R3 of the first terminal portion 22, the relative difference rate between the minimum distance between one first end face 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 is 0 to 10%.

[0219] It should be noted that the minimum distance between the limiting boss 232 and one of the first end faces 228 of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is the first distance, and the minimum distance between the limiting boss 232 and the other first end face 228 of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is the second distance. The relative difference rate between the minimum distance between one of the first end faces 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 along the length direction R3 of the first terminal portion 22 is the ratio of the absolute value of the difference between the first distance and the second distance to the arithmetic mean of the first distance and the second distance.

[0220] For example, the first terminal portion 22 is welded to the limiting boss 232.

[0221] In this embodiment, along the length direction R3 of the first terminal portion 22, the minimum distance between one first end face 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 are equal. The lengths of the first terminal portion 22 extending beyond the third terminal portion 23 along the length direction R3 of the first terminal portion 22 are relatively close. The pre-deformation of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is relatively uniform. The thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process is relatively uniform. The pre-deformation and thermal deformation along the length direction R3 of the first terminal portion 22 are well offset, thereby giving the surface of the first terminal portion 22 away from the electrode assembly 4 a better overall flatness.

[0222] It is understood that, along the length direction R3 of the first terminal portion 22, the minimum distance between one first end face 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 are not necessarily equal. For example, along the length direction R3 of the first terminal portion 22, the minimum distance between one first end face 228 and the limiting boss 232 is greater than the minimum distance between the other first end face 228 and the limiting boss 232.

[0223] In some embodiments, please refer to Figures 1-4 The first terminal portion 22 has a second through hole 221, and the third terminal portion 23 has a limiting boss 232 located in the second through hole 221 at one end away from the electrode assembly 4. The limiting boss 232 contacts at least part of the first terminal portion 22 on the side facing the electrode assembly 4 in the thickness direction R1 of the first wall 13. The first terminal portion 22 has at least two second end faces 229 arranged opposite to each other in the width direction R2 of the first terminal portion 22. In the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232 and the minimum distance between the other second end face 229 and the limiting boss 232 are equal.

[0224] It should be noted that, along the width direction R2 of the first terminal portion 22, the minimum distance between the second end face 229 and the limiting boss 232 is the minimum distance from the second end face 229 to the outermost contour of the limiting boss 232.

[0225] It should be noted that, along the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232 and the minimum distance between the other second end face 229 and the limiting boss 232 are equal means that, along the width direction R2 of the first terminal portion 22, the relative difference rate between the minimum distance between one second end face 229 and the limiting boss 232 and the minimum distance between the other second end face 229 and the limiting boss 232 is 0 to 10%.

[0226] It should be noted that, along the width direction R2 of the first terminal portion 22, the minimum distance between the limiting boss 232 and the second end face 229 of one of them is the third distance, and the minimum distance between the limiting boss 232 and the second end face 229 of the other is the fourth distance. The relative difference rate between the minimum distances between the second end face 229 of one of the terminals and the limiting boss 232, and between the minimum distances between the second end face 229 of the other and the limiting boss 232, along the width direction R2 of the first terminal portion 22, is the ratio of the absolute value of the difference between the third and fourth distances to the arithmetic mean of the third and fourth distances.

[0227] In this embodiment, along the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232 and the minimum distance between the other second end face 229 and the limiting boss 232 are equal. The widths of the first terminal portion 22 extending beyond the third terminal portion 23 along the width direction R2 of the first terminal portion 22 are relatively close. The pre-deformation of the first terminal portion 22 along the width direction R2 of the first terminal portion 22 is relatively uniform. The thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process is relatively uniform. The pre-deformation and thermal deformation along the width direction R2 of the first terminal portion 22 are well offset, which is beneficial to improving the flatness of the surface of the first terminal portion 22 away from the electrode assembly 4.

[0228] It is understood that, along the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232 and the minimum distance between the other second end face 229 and the limiting boss 232 are not necessarily equal. For example, along the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232 is greater than the minimum distance between the other second end face 229 and the limiting boss 232.

[0229] In some embodiments, please refer to Figures 1-4 The first terminal portion 22 has a second through hole 221, and the third terminal portion 23 has a limiting boss 232 located in the second through hole 221 at one end away from the electrode assembly 4. The limiting boss 232 contacts at least part of the first terminal portion 22 on the side of the first wall 13 facing the electrode assembly 4 in the thickness direction R1. The first terminal portion 22 has at least two first end faces 228 arranged opposite to each other along the length direction R3 of the first terminal portion 22 and at least two second end faces 229 arranged opposite to each other along the width direction R2 of the first terminal portion 22. The minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 is greater than the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22.

[0230] It should be noted that the first end face 228 and the second end face 229 are both outer contour surfaces of the first terminal portion 22. The first end face 228 does not include the hole wall surface of the second through hole 221 of the first terminal portion 22, and the second end face 229 does not include the hole wall surface of the second through hole 221 of the first terminal portion 22.

[0231] It should be noted that the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell is not powered off and not in operation.

[0232] It should be noted that the minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell is not powered off and not in operation.

[0233] For example, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is shown by dimension D1 in the figure, and the minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 is shown by dimension D3 in the figure.

[0234] In this embodiment, the minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 is greater than the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22. The first terminal portion 22 is more prone to warping deformation along the length direction R3 of the first terminal portion 22. The gap 6 is provided on at least one side along the length direction R3 of the first terminal portion 22, so that the first terminal portion 22 can generate a more suitable pre-deformation more smoothly along the length direction R3 of the first terminal portion 22, so as to better offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process, thereby making the surface of the first terminal portion 22 away from the electrode assembly 4 have better overall flatness.

[0235] It is understood that the minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 is not limited to being greater than the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22. For example, the minimum distance between the limiting boss 232 and each first end face 228 along the length direction R3 of the first terminal portion 22 is equal to the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22.

[0236] In some embodiments, please refer to Figures 1-5 In a plane perpendicular to the central axis of the second through hole 221, the cross-sectional shape of the second through hole 221 is circular, and the cross-sectional shape of the first terminal portion 22 is square.

[0237] For example, in a plane perpendicular to the central axis of the second through hole 221, the center of the circular cross-section of the second through hole 221 coincides with the center of the square cross-section of the first terminal portion 22.

[0238] In this embodiment, the cross-sectional shape of the second through hole 221 is circular, and the cross-sectional shape of the first terminal portion 22 is square, making the shape of the first terminal portion 22 more regular and easier to manufacture.

[0239] It is understood that the cross-sectional shape of the second through hole 221 is not limited to being circular. For example, the cross-sectional shape of the second through hole 221 is square.

[0240] In some embodiments, please refer to Figures 1-4The first terminal portion 22 has a second through hole 221, and the third terminal portion 23 has a limiting boss 232 located in the second through hole 221 at one end away from the electrode assembly 4. The limiting boss 232 contacts at least part of the first terminal portion 22 on the side facing the electrode assembly 4 in the thickness direction R1 of the first wall 13. The first terminal portion 22 has at least two second end faces 229 arranged opposite each other in the width direction R2 of the first terminal portion 22. The minimum distance between the limiting boss 232 and each second end face 229 in the width direction R2 of the first terminal portion 22 is 1.2mm to 4.5mm.

[0241] For example, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.2mm, 2mm, 2.5mm, 3mm, 4mm or 4.5mm.

[0242] In this embodiment, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.2mm to 4.5mm. The minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is suitable, so that the strength of both sides of the first terminal portion 22 along the width direction R2 of the first terminal portion 22 is suitable, and the pre-deformation of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is suitable, so as to better offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process, thereby making the surface of the first terminal portion 22 away from the electrode assembly 4 have better overall flatness.

[0243] It is understood that the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is not limited to 1.2mm to 4.5mm. For example, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.1mm or 4.6mm.

[0244] In some embodiments, the second through hole 221 includes a first sub-hole 222 and a second sub-hole 223. The second sub-hole 223 is located at one end of the first sub-hole 222 facing the electrode assembly 4 and is projected along the thickness direction R1 of the first wall 13. The projection area of ​​the second sub-hole 223 is located within the projection area of ​​the first sub-hole 222. The first terminal portion 22 has a protruding ring 225, which surrounds the second sub-hole 223. The hole wall surface of the first sub-hole 222 facing the electrode assembly 4 along the thickness direction R1 of the first wall 13 is a contact surface 2251, and the limiting boss 232 abuts against the contact surface 2251.

[0245] For example, when projected along the thickness direction R1 of the first wall 13, the projection area of ​​the portion of the third terminal portion 23 located inside the second sub-hole 223 is within the projection area of ​​the limiting boss 232.

[0246] In some embodiments, please refer to Figure 1 The minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.5mm to 3.5mm.

[0247] For example, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.5mm, 2mm, 2.5mm, 3mm or 3.5mm.

[0248] In this embodiment, the minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.5mm to 3.5mm. The minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is suitable, so that the strength of both sides of the first terminal portion 22 along the width direction R2 of the first terminal portion 22 is suitable, and the pre-deformation of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is suitable. This effectively counteracts the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process, thereby giving the surface of the first terminal portion 22 away from the electrode assembly 4 a better overall flatness.

[0249] In some embodiments, please refer to Figure 1 The length of the first terminal portion 22 is 25mm to 70mm.

[0250] For example, the length of the first terminal portion 22 is 25mm, 30mm, 40mm, 45mm, 50mm, 60mm, 65mm or 70mm.

[0251] It is understandable that the length of the first terminal portion 22 is the maximum dimension of the first terminal portion 22 along the length direction R3.

[0252] For example, the length of the first terminal portion 22 is shown by dimension D2 in the figure.

[0253] It should be noted that the length of the first terminal portion 22 can be obtained by measuring it with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell is not powered off and not in operation.

[0254] In this embodiment, the length of the first terminal portion 22 is 25mm to 70mm. The length of the first terminal portion 22 is within a suitable range. The pre-deformation of the first terminal portion 22 along the length direction R3 is suitable to offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has a better overall flatness.

[0255] It is understood that the length of the first terminal portion 22 is not limited to 25mm to 70mm. For example, the length of the first terminal portion 22 is 24mm or 71mm.

[0256] In some embodiments, please refer to Figure 1 The length of the first terminal portion 22 is 35mm to 60mm.

[0257] For example, the length of the first terminal portion 22 is 35mm, 38mm, 47mm, 5mm, 55mm or 60mm.

[0258] In some embodiments, please refer to Figures 1-3 The first terminal portion 22 is plate-shaped, and the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.2mm to 4mm.

[0259] For example, the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is shown by dimension T in the figure.

[0260] It should be noted that the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 can be obtained by measuring it under normal temperature and pressure conditions with a vernier caliper or ruler in the non-working state of the battery cell when it is powered off.

[0261] For example, the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.2mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm.

[0262] In this embodiment, the first terminal portion 22 is plate-shaped, and the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.2mm to 4mm. The thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is within a suitable range. The pre-deformation of the first terminal portion 22 along the length direction R3 of the first terminal portion 22 is suitable to counteract the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 under the influence of the heat source during the battery cell installation process, so that the surface of the first terminal portion 22 away from the electrode assembly 4 has a better overall flatness.

[0263] It is understood that the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is not limited to 1.2 mm to 4 mm. For example, the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.1 mm or 4.1 mm.

[0264] In some embodiments, please refer to Figures 1-3 The thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.5mm to 3mm.

[0265] For example, the thickness of the first terminal portion 22 in the thickness direction R1 of the first wall 13 is 1.5mm, 1.8mm, 2.3mm, 2.8mm or 3mm.

[0266] In some embodiments, the substrate of the first terminal portion 22 is aluminum.

[0267] It should be noted that the substrate of the first terminal portion 22 is the material with the largest mass percentage in the first terminal portion 22.

[0268] The percentage of the substrate mass is the percentage of the substrate mass to the total mass of the first terminal portion 22.

[0269] For example, the mass percentage of aluminum in the first terminal portion 22 can be 99% or more, such as 1-series aluminum with grade 1060.

[0270] For example, the material of the first terminal portion 22 may be an aluminum alloy containing aluminum and with other alloying elements besides aluminum added. For example, please refer to... Figure 6 The first terminal portion 22 includes a copper plate 226 and an aluminum plate 227 that are connected to each other.

[0271] For example, the mass percentage of copper in copper plate 226 can be 99% or more, such as T2 copper.

[0272] For example, the material of copper plate 226 may also be a copper alloy containing copper and having other alloying elements besides copper added.

[0273] For example, the mass percentage of aluminum in aluminum plate 227 can be 99% or more.

[0274] The copper plate 226 and the aluminum plate 227 are connected to form the first terminal portion 22.

[0275] After stacking copper and aluminum plates, copper plate 226 and aluminum plate 227 are joined together by rolling.

[0276] In this embodiment, the substrate of the first terminal portion 22 is aluminum, which enables the first terminal portion 22 to undergo a more suitable pre-deformation, so as to better offset the thermal deformation of the first terminal portion 22 away from the electrode assembly 4 caused by the heat source during the battery cell installation process, thereby making the surface of the first terminal portion 22 away from the electrode assembly 4 have better overall flatness.

[0277] In some embodiments, the surface of the first terminal portion 22 on the side opposite to the electrode assembly 4 is a preset surface 230, and the preset surface 230 is a plane.

[0278] It should be noted that the preset surface 230 being a plane means that the maximum height difference of the preset surface 230 in the direction perpendicular to the preset surface 230 is 0 to 0.1 mm.

[0279] For example, in the direction perpendicular to the preset surface 230, the maximum height difference of the preset surface 230 is 0, 0.01 mm, 0.05 mm, 0.08 mm or 0.1 mm.

[0280] In this embodiment, the surface of the first terminal portion 22 facing away from the electrode assembly 4 is a preset surface 230. The preset surface 230 is a plane and is relatively flat, and the flatness of the side of the first terminal portion 22 facing away from the electrode assembly 4 is good.

[0281] In some embodiments, please refer to Figure 2 The outer casing 1 includes a housing 11 and an end cap 12. The end cap 12 is connected to the housing 11. The electrode assembly 4 is located in the space enclosed by the housing 11 and the end cap 12. The first wall 13 is formed on the end cap 12. The insulating member 3 is located between the first terminal portion 22 and the end cap 12.

[0282] It should be noted that the end cap 12 is provided with an outlet, and the second terminal portion 21 extends out from the outlet and connects to the first terminal portion 22.

[0283] In this embodiment of the disclosure, the outer casing 1 includes a casing 11 and an end cap 12. The end cap 12 is connected to the casing 11. The electrode assembly 4 is located in the space enclosed by the casing 11 and the end cap 12. The electrode assembly 4 and the second terminal portion 21 are first installed into the casing 11, and then the end cap 12 is connected to the casing 11. The electrode assembly 4 is isolated in the space formed by the casing 11 and the end cap 12, which facilitates the assembly of the battery cell.

[0284] The battery cell also includes a lower plastic 5, which is located between the first wall 13 and the electrode assembly 4.

[0285] In some embodiments, the housing 1 is square in shape, and the electrode terminal assembly 2 is located at one end of the housing 1.

[0286] In this embodiment of the disclosure, the position of the housing 1 relative to the electrode terminal assembly 2 is less restricted.

[0287] In some embodiments, the housing 1 is square in shape, and electrode terminal assemblies 2 are provided at both opposite ends of the housing 1.

[0288] In this embodiment of the disclosure, the position of the housing 1 relative to the electrode terminal assembly 2 is less restricted.

[0289] For example, the battery cell is a blade battery.

[0290] In some embodiments, the projection area of ​​the third terminal portion 23 is circular when projected along the thickness direction R1 of the first wall 13.

[0291] In some embodiments, the projection area of ​​the third terminal portion 23 is non-circular, such as elliptical or polygonal, when projected along the thickness direction R1 of the first wall 13. The third terminal portion 23 has a columnar structure.

[0292] In some embodiments, please refer to Figures 1-5 and Figure 7The battery cell includes a housing 1, an electrode assembly 4, an electrode terminal assembly 2, and an insulating member 3. The housing 1 includes a first wall 13 with a first through hole 131. The electrode assembly 4 is housed within the housing 1. The electrode terminal assembly 2 includes a first terminal portion 22, a second terminal portion 21, and a third terminal portion 23. The first terminal portion 22 is located on the side of the first wall 13 away from the electrode assembly 4, the second terminal portion 21 is located on the side of the first wall 13 close to the electrode assembly 4, and the second terminal portion 21 is electrically connected to the electrode assembly 4. The third terminal portion 23 is at least partially located within the first through hole 131 and is connected to the first terminal portion 22 and the second terminal portion 21, respectively. The first wall 13 is partially installed between the first terminal portion 22 and the second terminal portion 21. The insulating member 3 is at least partially disposed between the first terminal portion 22 and the first wall 13, and a gap 6 is formed between the insulating member 3 and the first terminal portion 22. The gap 6 has a first portion 61 close to the first through hole 131 and a second portion 62 away from the first through hole 131. The arrangement direction of the first portion 61 and the second portion 62 is intersecting the thickness direction R1 of the first wall 13. In the thickness direction R1 of the first wall 13, the height of the first portion 61 is less than the height of the second portion 62. The height of the gap 6 in the thickness direction R1 of the first wall 13 gradually increases from the first portion 61 to the second portion 62. The insulating member 3 has a first surface 31 on the side facing the gap 6, and the first terminal portion 22 has a second surface 224 on the side facing the gap 6. The end of the first surface 31 away from the first through hole 131 is inclined towards the electrode assembly 4 in the thickness direction R1 of the first wall 13, and the second surface 224 is perpendicular to the thickness direction R1 of the first wall 13. The first surface 31 is planar, and the second surface 224 is planar. The maximum height of the gap 6 in the thickness direction R1 of the first wall 13 is 0.05 mm to 0.1 mm. A gap 6 is provided on at least one side of the third terminal portion 23 along the length direction R3 of the first terminal portion 22. The first portion 61 and the second portion 62 are arranged along the length direction R3 of the first terminal portion 22. The first terminal portion 22 has a second through hole 221. The end of the third terminal portion 23 facing away from the electrode assembly 4 has a limiting boss 232 located in the second through hole 221. The limiting boss 232 contacts at least a portion of the first terminal portion 22 on the side of the first wall 13 facing the electrode assembly 4 in the thickness direction R1. The first terminal portion 22 has at least two first end faces 228 arranged opposite each other along the length direction R3 of the first terminal portion 22. Along the length direction R3 of the first terminal portion 22, the minimum distance between one of the first end faces 228 and the limiting boss 232 and the minimum distance between the other first end face 228 and the limiting boss 232 are equal.The first terminal portion 22 has at least two second end faces 229 arranged opposite each other along the width direction R2 of the first terminal portion 22. Along the width direction R2 of the first terminal portion 22, the minimum distance between one second end face 229 and the limiting boss 232, and the minimum distance between the other second end face 229 and the limiting boss 232, are equal. The minimum distance between the limiting boss 232 and each second end face 229 along the width direction R2 of the first terminal portion 22 is 1.2mm to 4.5mm. The length of the first terminal portion 22 is 25mm to 70mm. The first terminal portion 22 is plate-shaped, and its thickness along the thickness direction R1 of the first wall 13 is 1.2mm to 4mm. The base material of the first terminal portion 22 is aluminum. The surface of the first terminal portion 22 facing away from the electrode assembly 4 is a preset surface 230, which is planar. The second terminal portion 21 is welded to the electrode assembly 4. The housing 1 includes a housing 11 and an end cap 12, the end cap 12 is connected to the housing 11, the electrode assembly 4 is located in the space enclosed by the housing 11 and the end cap 12, the first wall 13 is formed on the end cap 12, and the insulating member 3 is located between the first terminal portion 22 and the end cap 12.

[0293] In the description of this disclosure, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without contradiction.

[0294] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall having a first through hole; Electrode assembly, housed within the housing; An electrode terminal assembly includes a first terminal portion, a second terminal portion, and a third terminal portion. The first terminal portion is located on the side of the first wall away from the electrode assembly, and the second terminal portion is located on the side of the first wall close to the electrode assembly. The second terminal portion is electrically connected to the electrode assembly. The third terminal portion is at least partially located within the first through hole. The third terminal portion is connected to both the first terminal portion and the second terminal portion. The first wall is partially installed between the first terminal portion and the second terminal portion. An insulating element is at least partially disposed between the first terminal portion and the first wall, and a gap is formed between the insulating element and the first terminal portion.

2. The battery cell according to claim 1, characterized in that, The gap has a first portion close to the first through hole and a second portion away from the first through hole. The arrangement directions of the first portion and the second portion are intersecting the thickness direction of the first wall. In the thickness direction of the first wall, the height of the first portion is less than the height of the second portion.

3. The battery cell according to claim 2, characterized in that, The height of the gap in the thickness direction of the first wall gradually increases along the direction from the first part of the gap to the second part of the gap.

4. The battery cell according to claim 3, characterized in that, The insulating member has a first surface on the side facing the gap, and the first terminal portion has a second surface on the side facing the gap. The end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the second surface is perpendicular to the thickness direction of the first wall.

5. The battery cell according to claim 3, characterized in that, The insulating member has a first surface on the side facing the gap, and the first terminal portion has a second surface on the side facing the gap. The end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall.

6. The battery cell according to claim 3, characterized in that, The insulating member has a first surface facing the gap, and the first terminal portion has a second surface facing the gap. The end of the first surface away from the first through hole is inclined toward the electrode assembly along the thickness direction of the first wall, and the end of the second surface away from the first through hole is inclined away from the electrode assembly along the thickness direction of the first wall.

7. The battery cell according to claim 4, characterized in that, The first surface is a plane, and the second surface is a plane.

8. The battery cell according to claim 1, characterized in that, The maximum height of the gap in the thickness direction of the first wall is 0.02 mm to 0.2 mm.

9. The battery cell according to claim 8, characterized in that, The maximum height of the gap in the thickness direction of the first wall is 0.05 mm to 0.1 mm.

10. The battery cell according to claim 2, characterized in that, The gap is disposed on at least one side of the third terminal portion along the length direction of the first terminal portion, and the first portion and the second portion are arranged along the length direction of the first terminal portion.

11. The battery cell according to claim 10, characterized in that, The number of the third terminal portions is at least two, at least one of the third terminal portions is a preset terminal portion, and all the third terminal portions except the preset terminal portion are located on the same side of the preset terminal portion along the length direction of the first terminal portion. The gap is provided on the side of at least one preset terminal portion away from the other third terminal portions along the length direction of the first terminal portion.

12. The battery cell according to claim 10, characterized in that, The first terminal portion has a second through hole, and the third terminal portion has a limiting boss located in the second through hole at one end away from the electrode assembly. The limiting boss is in at least partial contact with the first terminal portion on one side of the first wall facing the electrode assembly in the thickness direction of the first wall. The first terminal portion has at least two first end faces arranged opposite each other along the length direction of the first terminal portion, characterized in that the minimum distance between one first end face and the limiting boss and the minimum distance between the other first end face and the limiting boss are equal; and / or, the first terminal portion has at least two second end faces arranged opposite each other along the width direction of the first terminal portion, characterized in that the minimum distance between one second end face and the limiting boss and the minimum distance between the other second end face and the limiting boss are equal.

13. The battery cell according to claim 10, characterized in that, The first terminal portion has a second through hole, and the third terminal portion has a limiting boss located in the second through hole at one end away from the electrode assembly. The limiting boss is in at least partial contact with the first terminal portion on the side of the first wall facing the electrode assembly in the thickness direction of the first wall. The first terminal portion has at least two second end faces arranged opposite each other in the width direction of the first terminal portion. The minimum distance between the limiting boss and each second end face in the width direction of the first terminal portion is 1.2 mm to 4.5 mm.

14. The battery cell according to claim 13, characterized in that, The minimum distance between the limiting boss and each second end face along the width direction of the first terminal portion is 1.5mm to 3.5mm.

15. The battery cell according to claim 10, characterized in that, The length of the first terminal portion is 25mm to 70mm; and / or, the shape of the first terminal portion is plate-shaped, and the thickness of the first terminal portion in the thickness direction of the first wall is 1.2mm to 4mm.

16. The battery cell according to any one of claims 1 to 15, characterized in that, The substrate of the first terminal is aluminum.

17. The battery cell according to any one of claims 1 to 15, characterized in that, The surface of the first terminal portion facing away from the electrode assembly is a preset surface, and the preset surface is a plane.

18. The battery cell according to any one of claims 1 to 15, characterized in that, The second terminal is welded to the electrode assembly.

19. The battery cell according to any one of claims 1 to 15, characterized in that, The outer casing includes: case; An end cap is connected to the housing, the electrode assembly is located within the space enclosed by the housing and the end cap, the first wall is formed in the end cap, and the insulating member is located between the first terminal portion and the end cap.

20. A battery device, characterized in that, include: Box; The battery cell according to any one of claims 1 to 19 is mounted on the housing.

21. An electrical appliance, characterized in that, include: Main body of the device; The battery device according to claim 20 is mounted on the device body.

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