Battery cells, battery packs and electrical devices

Abstract

This application discloses a battery cell, a battery device, and an electrical device. The battery cell includes a casing, a first electrode terminal, a first electrode assembly, and a first current collector. The casing has a first wall. The first electrode terminal is disposed on the first wall. The first electrode assembly includes a first main body and a first tab, the first tab being disposed on one side of the first main body along a first direction. The first current collector includes a tab connecting portion, which is connected to the first tab. The tab connecting portion includes a first part and a second part arranged along a second direction, wherein the thickness of the second part is greater than the thickness of the first part along the first direction. The first tab includes a first tab portion located on one side of the first part along the first direction, and on the same projection plane perpendicular to the second direction, the projection of the first tab portion at least partially overlaps with the projection of the second part, the first direction being perpendicular to the second direction. The technical solution provided by this application can effectively improve the charging and discharging performance of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the charging and discharging performance of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can effectively improve the charging and discharging performance of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, a first electrode terminal, a first electrode assembly, and a first current collector. The casing has a first wall. The first electrode terminal is disposed on the first wall. The first electrode assembly is housed within the casing and includes a first body portion and a first tab. The first tab is disposed on one side of the first body portion along a first direction, which is perpendicular to the thickness direction of the first wall. The first current collector is used to electrically connect the first tab and the first electrode terminal. The first current collector includes a tab connecting portion, which is connected to the first tab. The tab connecting portion includes a first part and a second part arranged along a second direction. Along the first direction, the thickness of the second part is greater than the thickness of the first part. The first tab includes a first tab portion located on one side of the first part along the first direction and connected to the first part. On the same projection plane perpendicular to the second direction, the projection of the first tab portion and the projection of the second part at least partially overlap, where the first direction is perpendicular to the second direction.

[0007] Some of the above embodiments provide a battery cell in which a first tab is electrically connected to a first electrode terminal via a first current collector to achieve current output and input. The first current collector includes a tab connection portion electrically connected to the first tab, the tab connection portion including a first part and a second part arranged along a second direction, the first tab including a first tab portion located on one side of the first part along the first direction, and the first tab portion connected to the first part to achieve electrical connection between the first tab and the first current collector. The second part is thicker than the first part, and on the same projection plane perpendicular to the second direction, the projection of the first tab and the projection of the second part overlap at least partially. On the one hand, this can increase the cross-sectional area of ​​the first current collector, thereby improving its current carrying capacity and enabling the battery cell to have a higher charge-discharge rate, thus effectively improving the charge-discharge performance of the battery device. On the other hand, it allows the part of the second part that protrudes from the first part to utilize the space on the side of the first tab, so that the first tab and the tab connection share part of the internal space of the outer casing, thereby making the battery cell structure compact and improving the volumetric energy density of the battery cell, which in turn improves the volumetric energy density of the battery device.

[0008] According to some embodiments of this application, the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

[0009] In the above scheme, the arrangement direction of the first part and the second part is perpendicular to the first direction and the thickness direction of the first wall, so that the thicker second part can utilize the space on the side of the first electrode tab, and the second part does not interfere with the first electrode tab and the first wall in the thickness direction of the first wall, which is conducive to the compactness of the spatial layout of the internal structural components of the battery cell and effectively reduces the assembly difficulty of the battery cell.

[0010] According to some embodiments of this application, along a first direction, the first electrode portion is located on the side of the first portion opposite to the first main body portion.

[0011] In the above scheme, the first tab is located on the side of the first part away from the first main body, that is, on the side of the first part away from the first main body. The second part can utilize the space on the side of the first tab to realize the sharing of space between the first tab and the tab connection part, so that the battery cell structure is compact, which is conducive to improving the volumetric energy density of the battery cell, and thus conducive to improving the volumetric energy density of the battery device.

[0012] According to some embodiments of this application, along the direction from the first main body portion to the electrode connection portion, the side of the second portion away from the first main body portion does not exceed the side of the first electrode connection portion away from the first main body portion.

[0013] In the above scheme, along the direction from the first main body to the tab connection portion, the second part protrudes from the first part, and the protruding part does not extend beyond the side of the first tab away from the first main body. This allows the tab connection portion to be locally thickened, that is, the second part to make reasonable use of the space where the first tab is located without occupying additional space. This allows the battery cell to have a higher volumetric energy density under the condition of increasing the charge and discharge rate of the battery cell by locally thickening the tab connection portion.

[0014] According to some embodiments of this application, the side of the first part facing the first main body along the first direction and the side of the second part facing the first main body along the first direction are coplanar.

[0015] In the above scheme, the second part protrudes from the first part on one side along the first direction, and is coplanar with the first part on the other side, which can play a foolproof role, effectively reduce the difficulty of assembling and positioning the first electrode and the electrode connection part, and help improve the manufacturing efficiency of the battery cell, thereby helping to improve the manufacturing efficiency of the battery device.

[0016] According to some embodiments of this application, the first electrode portion has a first end located away from the first main body portion. Along a second direction, a second portion is spaced apart from the first end.

[0017] In the above scheme, by setting the second part apart from the first end, the risk of mutual interference between the first electrode and the locally thickened part of the electrode connection can be reduced, resulting in high reliability of the battery cell structure and improving the reliability of the battery device.

[0018] According to some embodiments of this application, the first electrode assembly further includes a second electrode tab, which is disposed on the first main body and electrically connected to the electrode tab connection portion.

[0019] In the above scheme, the first electrode assembly also includes a second tab, which is electrically connected to the tab connection part. This can effectively increase the electrical connection area between the first electrode assembly and the first current collector, which is beneficial to the improvement of the overcurrent capacity, thereby improving the charge and discharge rate of the battery cell, and further improving the charge and discharge performance of the battery device.

[0020] According to some embodiments of this application, the second electrode and the first electrode are both disposed on the same side of the first main body along the first direction, and the first electrode and the second electrode do not overlap on the electrode connection portion.

[0021] Compared to the scheme where the first and second tabs overlap, the above scheme, by setting the first and second tabs to not overlap, can reduce the space occupied by the overlapping part of the first and second tabs in the internal space of the battery cell, which is conducive to improving the volumetric energy density of the battery cell. On the other hand, it can provide space for the locally thickened part of the tab connection, so that the battery cell has a higher charge and discharge rate, which is conducive to improving the charge and discharge performance of the battery device.

[0022] According to some embodiments of this application, the electrode connecting portion further includes a third portion. Along the second direction, the second portion is located between the first portion and the third portion. Along the first direction, the thickness of the second portion is greater than the thickness of the third portion. The second electrode includes a second electrode portion located on one side of the third portion along the first direction, and the second electrode portion is connected to the third portion. On the same projection plane perpendicular to the second direction, the projection of the second electrode portion at least partially overlaps with the projection of the second portion.

[0023] In the above scheme, the second part can utilize the space on the side of the second tab to make the battery cell structure compact, which is conducive to improving the volumetric energy density of the battery cell. Furthermore, by setting the thickness of the second part to be greater than that of the third part, the tab connection part can have a higher overcurrent capacity to effectively carry the input and output of current between the first electrode terminal and the first electrode assembly, thereby enabling the battery device to have higher charge and discharge performance.

[0024] According to some embodiments of this application, the battery cell further includes a second electrode assembly, and the first electrode assembly and the second electrode assembly are arranged along a second direction. The second electrode assembly includes a second body portion and a third tab, the third tab being disposed on one side of the second body portion along the first direction, and the third tab being electrically connected to the tab connection portion.

[0025] In the above solution, by setting a second electrode assembly inside the casing and electrically connecting the third tab of the second electrode assembly to the tab connection part, the volumetric energy density of the battery cell can be effectively improved, and it is beneficial to improve the capacity or voltage of the battery cell.

[0026] According to some embodiments of this application, the first electrode and the third electrode do not overlap at the electrode connection portion.

[0027] Compared to the scheme where the first and third tabs overlap, the above scheme, by setting the first and third tabs to not overlap, can reduce the space occupied by the overlapping part of the first and third tabs on the internal space of the battery cell, which is conducive to improving the volumetric energy density of the battery cell. On the other hand, it can provide space for the locally thickened part of the tab connection, so that the battery cell has a higher charge and discharge rate, which is conducive to improving the charge and discharge performance of the battery device.

[0028] According to some embodiments of this application, the electrode connecting portion further includes a third portion. Along the second direction, the second portion is located between the first portion and the third portion. Along the first direction, the thickness of the second portion is greater than the thickness of the third portion. The third electrode includes a third electrode portion located on one side of the third portion along the first direction, and the third electrode portion is connected to the third portion. On the same projection plane perpendicular to the second direction, the projection of the third electrode portion at least partially overlaps with the projection of the second portion.

[0029] In the above scheme, the second part can utilize the space on the side of the third tab to make the battery cell structure compact, which is conducive to improving the volumetric energy density of the battery cell. Furthermore, by setting the thickness of the second part to be greater than that of the third part, the tab connection part can have a higher current carrying capacity, so as to effectively carry the input and output of current between the first electrode terminal, the first electrode assembly and the second electrode assembly, thereby enabling the battery device to have higher charge and discharge performance.

[0030] According to some embodiments of this application, the thickness of the first part and the thickness of the third part are equal.

[0031] In the above scheme, the thickness of the first part is the same as that of the third part, which makes the overcurrent consistency between the tab connection part and the first tab, and between the tab connection part and the second tab good. By setting a second part with a larger thickness between the first part and the third part, it is beneficial to improve the charge and discharge rate of the battery cell, thereby enabling the battery device to have higher charge and discharge performance.

[0032] According to some embodiments of this application, the first electrode tab includes a plurality of stacked first electrode tab pieces, which are welded together to form a first solder mark.

[0033] In the above scheme, multiple first tabs are welded together to be integrated into one unit through the first solder mark. On the one hand, this reduces the risk of multiple first tabs being loose and affecting the current carrying capacity. On the other hand, it can effectively reduce the difficulty of electrical connection between the first tab and the tab connection part, which is conducive to improving the manufacturing efficiency of the battery cell.

[0034] According to some embodiments of this application, the first electrode tab is welded to the electrode tab connection portion to form a second solder mark portion.

[0035] In the above scheme, the first electrode tab and the electrode tab connection part are electrically connected by welding process, which makes the connection between the first electrode tab and the electrode tab connection part of high quality and high efficiency of electrical connection.

[0036] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 5% and less than or equal to 30%.

[0037] In the above scheme, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 5%, which can ensure high electrical connection quality between the electrode tab connection and the first electrode tab, reduce the risk of separation between the two, and facilitate the improvement of overcurrent capacity, so that the battery cell has a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is less than or equal to 30%, which can reduce the difficulty of welding, avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, and make the structure of the battery cell highly reliable.

[0038] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 10% and less than or equal to 20%.

[0039] In the above scheme, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 10%, which can further improve the electrical connection quality between the electrode tab connection and the first electrode tab, reduce the risk of separation between the two, and facilitate the improvement of overcurrent capacity, so that the battery cell has a larger charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is less than or equal to 20%, which can effectively reduce the difficulty of welding, avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, and make the structure of the battery cell highly reliable.

[0040] According to some embodiments of this application, the second solder mark is strip-shaped and extends along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0041] In the above scheme, the second solder mark is strip-shaped and extends along a third direction, which enables the second solder mark to effectively connect the first electrode and the electrode connection part into one unit, reducing the risk of separation between the first electrode and the electrode connection part, resulting in high reliability of the battery cell structure, and thus improving the reliability of the battery device.

[0042] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the projection of the second solder mark overlaps at least partially with the projection of the first solder mark.

[0043] In the above scheme, on the same projection plane perpendicular to the first direction, the projection of the second soldering part overlaps at least partially with the projection of the first soldering part, so that the tab connection part can be electrically connected to all the first tab pieces, thereby effectively improving the charge and discharge rate of the battery cell, and thus effectively improving the charge and discharge performance of the battery device.

[0044] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the projection of the first solder mark covers the projection of the second solder mark, and the ratio of the projection area of ​​the second solder mark to the projection area of ​​the first solder mark is greater than or equal to 30% and less than or equal to 80%.

[0045] In the above scheme, the projection of the second solder mark is covered by the projection of the first solder mark, and the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is greater than or equal to 30%. This ensures that the electrode connection part has a high electrical connection quality with the pre-welded joint of multiple first electrode tabs, which is beneficial to improving the overcurrent capacity and enabling the battery cell to have a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is less than or equal to 80%, which can reduce the difficulty of welding and avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, thus making the structure of the battery cell highly reliable.

[0046] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is greater than or equal to 50% and less than or equal to 70%.

[0047] In the above scheme, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is greater than or equal to 50%, which further enables the electrode connection part to have a high electrical connection quality with the pre-welded joint of multiple first electrode tabs, which is conducive to improving the overcurrent capacity and enabling the battery cell to have a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is less than or equal to 70%, which can effectively reduce the welding difficulty and avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, thus making the structure of the battery cell highly reliable.

[0048] According to some embodiments of this application, the first electrode tab has a first edge, a second edge and a third edge. The first edge and the second edge are disposed opposite each other along a third direction. The first edge is farther away from the first wall than the second edge. The third edge extends along the third direction and connects the first edge and the second edge. The angle between the third edge and the first edge is greater than 90° and less than or equal to 140°. The first direction, the second direction and the third direction are perpendicular to each other.

[0049] In the above solution, by setting the angle of the end of the first electrode tab away from the first main body, that is, the angle between the third edge and the first edge, to be greater than 90° and less than or equal to 140°, the risk of wrinkles or folds occurring during the bending of the first electrode tab to bypass the first side, causing the first electrode tab to insert into the first main body and resulting in a short circuit inside the battery cell, can be effectively reduced. This makes the battery cell have high reliability, and thus the battery device has high reliability.

[0050] According to some embodiments of this application, the angle between the third edge and the first edge is greater than or equal to 95° and less than 135°.

[0051] In the above scheme, by setting the angle between the third edge and the first edge to be greater than or equal to 95° and less than or equal to 135°, the risk of wrinkles or folds occurring during the bending of the first electrode tab to bypass the first side can be further reduced, which could cause the first electrode tab to insert into the first main body and lead to a short circuit inside the battery cell. This makes the battery cell more reliable, and thus the battery device more reliable.

[0052] According to some embodiments of this application, along the direction from the first wall to the first electrode assembly, the side of the tab connection portion away from the first wall extends beyond the side of the first tab away from the first wall.

[0053] In the above scheme, along the direction from the first wall to the first electrode assembly, the tab connection portion extends beyond the first tab, so that the portion of the first tab that bypasses the first side is entirely disposed on the tab connection portion, reducing the risk of the first tab being inserted into the first main body causing a short circuit inside the battery cell, thus making the battery cell have higher reliability, and consequently making the battery device have higher reliability.

[0054] According to some embodiments of this application, in the direction from the first wall to the first electrode assembly, the tab connection portion has a fourth portion extending beyond the first tab, the thickness of the fourth portion being less than or equal to the thickness of the first portion.

[0055] In the above scheme, the fourth part can play a protective role, reducing the risk of the first tab being inserted into the first main body during the folding process, thus making the structure of the battery cell highly reliable; at the same time, by setting the thickness of the fourth part to be less than or equal to the thickness of the first part, the impact of the fourth part on the energy density of the battery cell is reduced.

[0056] According to some embodiments of this application, along the direction from the first wall to the first electrode assembly, the side of the first main body portion away from the first wall extends beyond the side of the tab connection portion away from the first wall.

[0057] In the above scheme, along the direction from the first wall to the first electrode assembly, the side of the first main body that is away from the first wall extends beyond the side of the tab connection that is away from the first wall, so that the length of the tab connection is appropriate, reducing the risk that the tab connection is too long and affects the volumetric energy density and gravimetric energy density of the battery cell, and making the battery device have a high energy density.

[0058] According to some embodiments of this application, the first electrode assembly further includes a third electrode tab, the polarity of which is opposite to that of the first electrode tab, and the third electrode tab is disposed on the other side of the first main body along a first direction. The battery cell further includes a second electrode terminal and a second current collector, the second electrode terminal being disposed on the first wall, the second electrode terminal and the first electrode terminal being arranged along the first direction, and the second current collector being used to electrically connect the third electrode tab and the second electrode terminal.

[0059] In the above scheme, a second electrode terminal is provided on the first wall. The second electrode terminal is connected to the third electrode tab through the second current collector, so that the battery cell can realize the output or input of positive and negative current on the same end. This facilitates the electrical connection of two adjacent battery cells in the battery device, reduces the difficulty of battery assembly, and makes the manufacturing efficiency of the battery device high.

[0060] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0061] The battery cells provided by the above solution have high charge and discharge performance and reliability. In particular, when the capacity of the battery cell is greater than or equal to 500Ah, it can effectively improve the charging rate of the battery, thereby meeting the charging and discharging requirements of large-capacity batteries.

[0062] According to some embodiments of this application, the outer casing is a square casing, with a dimension W1 in the first direction, a dimension T1 in the second direction, and a dimension H1 in the third direction, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction, the second direction and the third direction are perpendicular to each other.

[0063] According to some embodiments of this application, the outer casing is a steel casing.

[0064] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0065] Thirdly, some embodiments of this application also provide an electrical device, which includes the battery cell provided in the first aspect and / or the battery device provided in the second aspect.

[0066] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0067] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application;

[0069] Figure 2 This is an exploded perspective view of the battery device in some embodiments of this application;

[0070] Figure 3 This is a perspective view of a single battery cell in some embodiments of this application;

[0071] Figure 4 This is an exploded perspective view of a battery cell in some embodiments of this application;

[0072] Figure 5 This is a top view of a battery cell in some embodiments of this application;

[0073] Figure 6 for Figure 5 Sectional view along the AA direction;

[0074] Figure 7 for Figure 6 A sectional view from the middle BB direction;

[0075] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0076] Figure 9 This is a schematic diagram of the first part, the second part, and the first electrode ear in some embodiments of this application;

[0077] Figure 10 This is a schematic diagram of the second part and the first end in some other embodiments of this application;

[0078] Figure 11 This is an exploded perspective view of a battery cell in some other embodiments of this application;

[0079] Figure 12 This is a schematic diagram of the first electrode tab and the electrode tab connection portion in some embodiments of this application;

[0080] Figure 13 This is a partial structural diagram of the first electrode tab and the electrode tab connection portion in some embodiments of this application;

[0081] Figure 14This is a schematic diagram of the first electrode tab and the electrode tab connection portion in other embodiments of this application;

[0082] Figure 15 This is a schematic diagram of a single battery cell in some embodiments of this application.

[0083] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 10 - Battery Cell; 11 - Housing; 110 - Shell; 111 - Cover; 112 - First Wall; 12 - First Electrode Terminal; 13 - First Electrode Assembly; 130 - First Main Body; 131 - First Tab; 1310 - First End; 1311 - First Tab Sheet; 1312 - First Solder Print; 1313 - Bending Section; 1314 - First Tab; 132 - Second Tab; 1320 - Second Tab; 14 - First Current Collector; 140 - Tab Connection; 141 - Terminal connection portion; 142- First part; 1420- First side; 1421- First surface; 1422- Second surface; 143- Second part; 1430- Third surface; 144- Third part; 1440- Second side; 1441- Fourth surface; 145- Second solder mark portion; 146- Fourth part; 15- Second electrode assembly; 150- Second main body portion; 151- Third electrode tab; 1510- Third electrode tab portion; 160- First edge; 161- Second edge; 162- Third edge; 17- Second electrode terminal; 18- Second current collector; 19- Insulating film; y- First direction; x- Second direction; z- Third direction. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0086] In this application, the reference to "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 application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0087] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0088] In this application, 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, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0089] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0090] In this application, "multiple" means two or more (including two).

[0091] In this embodiment of the application, 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.

[0092] 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 of this application are not limited to this.

[0093] A single battery cell typically includes a first electrode assembly. This first electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits to some extent while allowing active ions to pass through.

[0094] In some embodiments, the positive electrode may 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.

[0095] As an 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.

[0096] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0097] As an example, 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 application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials 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 iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM6), LiNi0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0098] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0099] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0100] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0101] As an 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.

[0102] As an 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.

[0103] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, 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 application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0104] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0105] In some embodiments, the first electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0106] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0107] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0108] 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.

[0109] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0110] In some embodiments, the electrolyte salt may include 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.

[0111] In some embodiments, the solvent may include at least one selected from 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 selected from 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.

[0112] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0113] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0114] As an example, polymer solid electrolytes can be polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0115] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0116] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0117] In some embodiments, the first electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0118] In some implementations, the first electrode assembly is a stacked structure.

[0119] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0120] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0121] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0122] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0123] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0124] In some embodiments, the first electrode assembly may be cylindrical, flat, or polygonal, etc.

[0125] In some embodiments, the first electrode assembly is provided with tabs that allow current to be drawn from the first electrode assembly. The tabs include a positive tab and a negative tab.

[0126] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the first electrode assembly and the electrolyte. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0127] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0128] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0129] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0130] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0131] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0132] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0133] As an example, the enclosure may include a first main body portion of a first enclosure and a second main body portion of a second enclosure. The first main body portion of the first enclosure and the second main body portion of the second enclosure are fastened together to form a closed space inside the enclosure for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first main body portion of the first enclosure may be a top cover or a bottom plate.

[0134] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0135] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0136] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0137] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the charge and discharge performance of the battery device must also be taken into account.

[0138] In related technologies, a single battery cell includes a casing, electrode terminals, a current collector, and an electrode assembly. The casing includes a housing and a cover. The electrode terminals are disposed on the cover. The electrode assembly includes a main body and tabs. The tabs are disposed on opposite sides of the electrode terminals. The tabs extend from the main body and are electrically connected to the current collector, allowing the tabs to be electrically connected to the electrode terminals via the current collector to achieve the input or output of electrical energy. However, with the continuous improvement of the discharge performance requirements of rechargeable battery devices, the current-carrying capacity of the current collector in related technologies cannot meet the high charge / discharge rate requirements of the single battery cell, affecting the charge / discharge performance of the battery device.

[0139] In view of this, to improve the problem of poor current-carrying capacity of the current collector affecting the charging and discharging performance of the battery device, this application provides a battery cell, which includes a casing, a first electrode terminal, a first electrode assembly, and a first current collector. The casing has a first wall. The first electrode terminal is disposed on the first wall. The first electrode assembly is housed within the casing and includes a first main body and a first tab. The first tab is disposed on one side of the first main body along a first direction, which is perpendicular to the thickness direction of the first wall. The first current collector is used to electrically connect the first tab and the first electrode terminal. The first current collector includes a tab connecting portion, which is connected to the first tab. The tab connecting portion includes a first part and a second part arranged along a second direction. Along the first direction, the thickness of the second part is greater than the thickness of the first part. The first tab includes a first tab portion located on one side of the first part along the first direction and connected to the first part. On the same projection plane perpendicular to the second direction, the projection of the first tab portion and the projection of the second part at least partially overlap, and the first direction is perpendicular to the second direction.

[0140] Some of the above embodiments provide a battery cell in which a first tab is electrically connected to a first electrode terminal via a first current collector to achieve current output and input. The first current collector includes a tab connection portion electrically connected to the first tab, the tab connection portion including a first part and a second part arranged along a second direction, the first tab including a first tab portion located on one side of the first part along the first direction, and the first tab portion connected to the first part to achieve electrical connection between the first tab and the first current collector. The second part is thicker than the first part, and on the same projection plane perpendicular to the second direction, the projection of the first tab and the projection of the second part overlap at least partially. On the one hand, this can increase the cross-sectional area of ​​the first current collector, thereby improving its current carrying capacity and enabling the battery cell to have a higher charge-discharge rate, thus effectively improving the charge-discharge performance of the battery device. On the other hand, it allows the part of the second part that protrudes from the first part to utilize the space on the side of the first tab, so that the first tab and the tab connection share part of the internal space of the outer casing, thereby making the battery cell structure compact and improving the volumetric energy density of the battery cell, which in turn improves the volumetric energy density of the battery device.

[0141] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0142] The technical solutions described in the embodiments of this application are applicable to battery devices, energy storage devices using battery devices, and electrical devices using battery devices.

[0143] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more battery cells and / or battery devices mounted on the cabinet.

[0144] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0145] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0146] Figure 1 This is a schematic diagram of vehicle 1000 in some embodiments of this application.

[0147] The electrical device is a vehicle 1000. Inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be installed. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0148] Please refer to Figure 2 , Figure 2 This is an exploded perspective view of the battery device 100 in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0149] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0150] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as cylinder, cuboid or cube.

[0151] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0152] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0153] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other through a busbar.

[0154] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes.

[0155] Some embodiments of this application provide a single battery cell 10; please refer to [link to relevant documentation]. Figures 3-8 , Figure 3This is a perspective view of the battery cell 10 in some embodiments of this application. Figure 4 This is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 This is a top view of a battery cell 10 in some embodiments of this application. Figure 6 for Figure 5 Sectional view in the middle AA direction. Figure 7 for Figure 6 A sectional view from the BB direction. Figure 8 for Figure 7 A magnified view of point C in the middle.

[0156] The battery cell 10 includes a housing 11, a first electrode terminal 12, a first electrode assembly 13, and a first current collector 14. The housing 11 has a first wall 112. The first electrode terminal 12 is disposed on the first wall 112. The first electrode assembly 13 is housed within the housing 11 and includes a first body portion 130 and a first tab 131. The first tab 131 is disposed on one side of the first body portion 130 along a first direction y, which is perpendicular to the thickness direction of the first wall 112. The first current collector 14 is used to electrically connect the first tab 131 and the first electrode terminal 12. The first current collector 14 includes a tab connection portion 140, which is connected to the first tab 131. The tab connection portion 140 includes a first portion 142 and a second portion 143 arranged along a second direction x. Along the first direction y, the thickness of the second portion 143 is greater than the thickness of the first portion 142. The first electrode tab 131 includes a first electrode tab portion 1314, which is located on one side of the first portion 142 along the first direction y, and is connected to the first portion 142. On the same projection plane perpendicular to the second direction x, the projection of the first electrode tab portion 1314 at least partially overlaps with the projection of the second portion 143, where the first direction y is perpendicular to the second direction x.

[0157] The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes, and correspondingly, the outer casing 11 can be in the form of a cuboid, cylinder, prism, pouch, or other shapes. In some embodiments of this application, the battery cell 10 is a cuboid and the outer casing 11 is a cuboid as an example.

[0158] The battery cell 10 includes a housing 11, which is a component for housing electrode assemblies. The housing 11 can also be used to house an electrolyte, such as an electrolyte solution. Please see below. Figure 4 In some embodiments, the housing 11 includes a housing 110 and a cover 111. The housing 110 has an internal cavity for accommodating an electrode assembly, and the housing 110 has an opening communicating with the cavity. The cover 111 closes onto the opening of the housing 110 to form a closed space for accommodating the electrode assembly and electrolyte.

[0159] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a sealed structure, it can protect the electrode assembly and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can still protect the electrode assembly, and a sealing bag may be included between the housing 11 and the electrode assembly. This sealing bag is used to encapsulate the electrode assembly and electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0160] In some embodiments, the housing 110 may be made of metal or a combination of metal and non-metal. For example, the housing 110 may be made of metal, such as copper, iron, aluminum, steel, stainless steel or aluminum alloy.

[0161] In some embodiments, the cover 111 may be made of metal or a combination of metal and non-metal. For example, the cover 111 may be made of metal, such as copper, iron, aluminum, steel, or aluminum alloy. In other embodiments, the cover 111 may be made of non-metallic materials, such as plastic or ceramic.

[0162] In some embodiments, the cover 111 may be made of the same material as the housing 110, and the two are connected to each other.

[0163] In some embodiments, the housing 110 may include sidewalls and endwalls, with the endwalls disposed opposite to the cover 111. Optionally, openings are formed at opposite ends of the sidewalls, the cover 111 is connected to the sidewalls to close one of the openings, and the endwalls are connected to the sidewalls to close the other opening. Optionally, the sidewalls and endwalls are integrally formed.

[0164] Optionally, a pressure relief mechanism may be provided on the housing 11 to release the pressure inside the battery cell. The pressure relief mechanism includes, but is not limited to, structures such as explosion-proof valves and grooves provided on the housing. For example, the pressure relief mechanism may be provided on the cover.

[0165] Optionally, the housing 11 may be provided with an injection port for injecting electrolyte into the housing 11. The injection port may be sealed with a sealing pin.

[0166] In some embodiments, the first wall 112 can be a cover 111, an end wall, or a side wall. Some embodiments of this application are illustrated using the cover 111 as an example where the first wall 112 is the cover 111.

[0167] In some embodiments, a first electrode terminal 12 is provided on the first wall 112, and the first electrode terminal 12 is used for electrical connection with the first tab 131 of the electrode assembly. Optionally, the first electrode terminal 12 is insulated from the first wall 112. Optionally, the first electrode terminal 12 is electrically connected to the first wall 112.

[0168] Optionally, the material of the first electrode terminal 12 can be metal or composite metal, such as copper, iron, aluminum, steel or aluminum alloy, or copper-aluminum composite metal, copper-steel composite metal, etc.

[0169] In some embodiments, the first electrode terminal 12 may be riveted to the first wall 112. In other embodiments, the first electrode terminal 12 may be fixed to the first wall 112 by a welding ring.

[0170] In some embodiments, the battery cell 10 further includes a second electrode terminal 17, which can be electrically connected to the third tab 151 of the electrode assembly. The first tab 131 and the third tab 151 have opposite polarities. The first electrode terminal 12 and the second electrode terminal 17 have opposite polarities; one of them can serve as a positive electrode terminal, and the other as a negative electrode terminal. Optionally, the second electrode terminal 17 can be disposed on the cover 111, side wall, or end wall. When the first electrode terminal 12 and the second electrode terminal 17 are both disposed on the first wall 112, at least one of the first electrode terminal 12 and the second electrode terminal 17 is insulated from the first wall 112 to avoid short circuit between positive and negative terminals. Exemplarily, the first electrode terminal 12 and the second electrode terminal 17 are respectively insulatedly mounted on the first wall 112. Some embodiments of this application are illustrated using the second electrode terminal 17 disposed on the first wall 112 as an example.

[0171] Optionally, the material of the second electrode terminal 17 can be metal or composite metal, such as copper, iron, aluminum, steel or aluminum alloy, or copper-aluminum composite metal, copper-steel composite metal, etc.

[0172] In some embodiments, the second electrode terminal 17 may be riveted to the first wall 112. In other embodiments, the second electrode terminal 17 may be fixed to the first wall 112 by a welding ring.

[0173] Optionally, when the first electrode terminal 12 is insulated and installed on the first wall 112, the third electrode tab 151 can be electrically connected to the housing 11 of the battery cell 10. For example, the first wall 112 is a cover 111, and the third electrode tab 151 can be electrically connected to the end wall.

[0174] In some embodiments of this application, the electrode assembly in the battery cell 10 includes, but is not limited to, one, two, or more.

[0175] Please see Figures 3-8 The battery cell 10 includes a first electrode assembly 13, which is disposed within the housing 11. The first electrode assembly 13 can be a wound structure or a stacked structure. Some embodiments of this application are illustrated using a stacked structure as an example.

[0176] The first electrode assembly 13 includes a first main body 130 and a first electrode tab 131. The first main body 130 includes a positive electrode plate, a negative electrode plate and a separator plate disposed in layers. The separator plate is disposed between the positive electrode plate and the negative electrode plate, and the positive electrode plate and the negative electrode plate have opposite polarities.

[0177] The first tab 131 is connected to either the positive or negative electrode plate; exemplarily, the first tab 131 is connected to the positive electrode plate. The first tab 131 is connected to the first electrode terminal 12 via the first current collector 14. The first electrode assembly 13 also includes a third tab, which is connected to the other of the positive or negative electrode plate. The third tab can be electrically connected to the second electrode terminal 17 or to the housing 11. Exemplarily, the third tab can be electrically connected to the second electrode terminal 17 via the second current collector 18, or the third tab can be electrically connected to the end wall via the second current collector 18.

[0178] In some embodiments of this application, the first electrode tab 131 is disposed on one side of the first main body portion 130 along the first direction y, and the first direction y is perpendicular to the thickness direction of the first wall 112. The first electrode tab 131 and the first electrode terminal 12 are disposed on opposite sides.

[0179] The first current collector 14 is a structural component that electrically connects the first tab 131 and the first electrode terminal 12. The material of the first current collector 14 includes, but is not limited to, copper, iron, aluminum, steel, stainless steel, or aluminum alloy. In some embodiments, the surface of the first current collector 14 may be provided with a metal plating layer, such as a nickel plating layer.

[0180] Optionally, the first current collector 14 includes a tab connection portion 140, which is electrically connected to the first tab 131. The tab connection portion 140 can be electrically connected to the first tab 131 by means of welding, riveting, threaded connection, etc. For example, the tab connection portion 140 is welded to the first tab 131, and the welding form includes, but is not limited to, ultrasonic welding or laser welding.

[0181] Optionally, the first current collector 14 further includes a terminal connection portion 141 connected to the electrode connection portion 140. The terminal connection portion 141 is electrically connected to the first electrode terminal 12. The terminal connection portion 141 can be electrically connected to the first electrode terminal 12 by means of welding, riveting, threaded connection, etc. For example, the terminal connection portion 141 can be welded to the first electrode terminal 12, and the welding form includes, but is not limited to, ultrasonic welding or laser welding.

[0182] For example, the terminal connection portion 141 and the electrode connection portion 140 are bent relative to each other and are generally L-shaped. The terminal connection portion 141 is located between the first wall 112 and the first main body portion 130, and the electrode connection portion 140 may be located between the side wall and the first main body portion 130.

[0183] Please see Figure 4 and Figure 8 The electrode connecting portion 140 includes a first portion 142 and a second portion 143 arranged along a second direction x, wherein the first direction y and the second direction x are perpendicular to each other. Optionally, the second direction x may be parallel to the thickness direction of the first wall 112. Optionally, the second direction x may be perpendicular to the thickness direction of the first wall 112, that is, the first direction y, the second direction x, and the thickness direction of the first wall 112 are mutually perpendicular. In some embodiments of this application, the example is described with the thickness direction of the first wall 112 as the third direction z, and the first direction y, the second direction x, and the third direction z being mutually perpendicular.

[0184] Along the first direction y, the thickness of the second part 143 is greater than the thickness of the first part 142. This can be understood as the second part 143 protruding at least on one side of the first part 142 along the first direction y. For example, the second part 143 protrudes on the side of the first part 142 away from the first main body 130 along the first direction y, or the second part 143 protrudes on the side of the first part 142 facing the first main body 130 along the first direction y, or the second part 143 protrudes on both sides of the first part 142 along the first direction y.

[0185] For example, please see Figure 4 and Figure 8 Along the first direction y, the thickness of the second part 143 is greater than the thickness of the first part 142, and the second part 143 protrudes from the first surface 1421.

[0186] The first electrode tab 1314 is the part where the first electrode tab 131 and the electrode tab connecting part 140 are connected to each other. Optionally, the first electrode tab 131 includes a bent section 1313 and a first electrode tab 1314. The first electrode tab 1314 is connected to the first main body part 130 through the bent section 1313. The first electrode tab 1314 is located on one side of the first part 142 along the first direction y and is electrically connected to the first part 142.

[0187] In some embodiments, the first electrode tab 1314 is located on the side of the first portion 142 facing the first body portion 130. In other embodiments, the first electrode tab 1314 is located on the side of the first portion 142 away from the first body portion 130.

[0188] Taking the first tab 1314 located on the side of the first portion 142 away from the first main body 130 as an example, the first portion 142 has a first side surface 1420 away from the second portion 143 along the second direction x, and a first surface 1421 away from the first main body 130 along the first direction y. The first tab 131 passes around the first side surface 1420 and connects to the first surface 1421, and the first direction y is perpendicular to the second direction x. Exemplarily, the first tab 131 includes a plurality of first tab pieces 1311, which are connected to either a positive or negative electrode piece. The plurality of first tab pieces 1311 are stacked and folded together along the first direction y to form the first tab 131, and the free end of the first tab 131 faces the second direction x. Then, the first tab 131 is folded to pass around the first side surface 1420 of the first portion 142 and is stacked with the first surface 1421.

[0189] On the same projection plane perpendicular to the second direction x, the projection of the first electrode ear 1314 and the projection of the second part 143 at least partially overlap. This can be understood as follows: when observing the first electrode ear 1314 and the electrode ear connecting part 140 along the second direction x, there are overlapping parts between the first electrode ear 1314 and the second part 143. For example, the part of the second part 143 that protrudes from the first part 142 can overlap with the first electrode ear 1314. That is, the locally thickened part of the electrode ear connecting part 140 can utilize the space on the side of the first electrode ear 1314 to achieve space sharing between the electrode ear connecting part 140 and the first electrode ear 131.

[0190] For example, such as Figure 8 As shown, the second portion 143 protrudes from the side of the first portion 142 opposite to the first main body portion 130, and the first pole ear portion 1314 is located on the side of the first portion 142 opposite to the first main body portion 130; or, as Figure 9 As shown, Figure 9 This is a schematic diagram of a first portion 142, a second portion 143, and a first electrode ear 1314 in some embodiments of this application. The second portion 143 protrudes from the side of the first portion 142 facing the first main body portion 130, and the first electrode ear 1314 is located on the side of the first portion 142 facing the first main body portion 130.

[0191] Optionally, along the first direction y, the second portion 143 protrudes from the first surface 1421 but does not protrude from the side of the first pole ear portion 1314 away from the first main body portion 130.

[0192] Optionally, the thickness of the second part 143 being greater than the thickness of the first part 142 along the first direction y can be understood as the local thickening of the tab connection 140 to form a thicker second part 143. By locally thickening the tab connection 140, the flow capacity of the first current collector 14 can be improved.

[0193] Optionally, the thickness of the second part 143 being greater than the thickness of the first part 142 along the first direction y can be understood as the tab connection portion 140 being locally thinned to form a first part 142 with a smaller thickness. By locally thinning the tab connection portion 140, the internal space of the battery cell 10 can be made compact, which is beneficial to improving the volumetric energy density.

[0194] Some of the above embodiments provide a battery cell 10. A first tab 131 in the battery cell 10 is electrically connected to a first electrode terminal 12 via a first current collector 14 to achieve current output and input. The first tab 131 and the first electrode terminal 12 are arranged on opposite sides, which reduces the space occupied by their stacking if they were arranged on the same side. The first current collector 14 includes a tab connection portion 140 electrically connected to the first tab 131. The tab connection portion 140 includes a first portion 142 and a second portion 143 arranged along a second direction x. The first tab 131 includes a first tab portion 1314, which is located on the side of the first portion 142 along a first direction y, and is connected to the first portion 142 to achieve electrical connection between the first tab 131 and the first current collector. The thickness of the second part 143 is greater than that of the first part 142. On the same projection plane perpendicular to the second direction x, the projection of the first tab 1314 and the projection of the second part 143 overlap at least partially. On the one hand, this can increase the cross-sectional area of ​​the first current collector, thereby improving the current carrying capacity of the first current collector and enabling the battery cell 10 to have a higher charge and discharge rate, thus effectively improving the charge and discharge performance of the battery device 100. On the other hand, the part of the second part 143 that protrudes from the first part 142 can utilize the space on the side of the first tab 1314, so that the first tab 131 and the tab connection part 140 share part of the space inside the outer shell 11. This makes the battery cell 10 more compact and improves the volumetric energy density of the battery cell 10, thereby improving the volumetric energy density of the battery device 100.

[0195] According to some embodiments of this application, please refer to Figure 3 The first direction y, the second direction x, and the thickness direction of the first wall 112 are perpendicular to each other.

[0196] In some embodiments, the thickness direction of the first wall 112 is the third direction z, and the thickness directions of the first direction y, the second direction x, and the third direction z are perpendicular to each other. The first part 142 and the second part 143 are arranged along the second direction x. The first electrode 131 is led out from one side of the first body part 130 along the first direction y and partially folded to be electrically connected to the outside of the first part 142. The part of the second part 143 that protrudes from the first part 142 is arranged with the first electrode 131 along the second direction x. The first wall 112 is located on one side of the first body part 130 along the third direction z, that is, the first electrode terminal 12 is located on one side of the first body part 130 along the third direction z.

[0197] In the above scheme, the arrangement direction of the first part 142 and the second part 143 is perpendicular to the first direction y and the thickness direction of the first wall, so that the thicker second part 143 can utilize the space of the first tab 1314 along the second direction x to realize the shared space between the tab connection part 140 and the first tab 131, and so that the second part 143 does not interfere with the first tab 131 and the first wall in the thickness direction of the first wall, which is conducive to the compactness of the spatial layout of the internal structural components of the battery cell 10 and effectively reduces the assembly difficulty of the battery cell.

[0198] According to some embodiments of this application, please refer to Figure 8 Along the first direction y, the first pole ear 1314 is located on the side of the first part 142 opposite to the first main body part 130.

[0199] Optionally, the first portion 142 has a first side surface 1420 that is opposite to the second portion 143 along the second direction x, and the first portion 142 has a first surface 1421 that is opposite to the first main body portion 130 along the first direction y. The second portion 143 protrudes from the first surface 1421, and the first electrode tab 131 bypasses the first side surface 1420, such that the first electrode tab portion 1314 is located on the side of the first surface 1421 opposite to the first main body portion 130 and is connected to the first surface 1421.

[0200] In the above scheme, the first tab 1314 is located on the side of the first part 142 away from the first main body 130, that is, on the side of the first part 142 away from the first main body 130. The second part 143 can utilize the space of the first tab 1314 along the second direction x to achieve space sharing between the two, making the battery cell 10 structure compact, thereby facilitating the improvement of the volumetric energy density of the battery cell 10, and further facilitating the improvement of the volumetric energy density of the battery device 100.

[0201] According to some embodiments of this application, please refer to Figure 8Along the direction from the first main body portion 130 to the electrode connecting portion 140, the side of the second portion 143 away from the first main body portion 130 does not exceed the side of the first electrode 131 away from the first main body portion 130.

[0202] In some embodiments, the portion of the second portion 143 that protrudes from the first surface 1421 is located between the plane on the side of the first tab 131 opposite to the first body portion 130 and the plane on the first surface 1421.

[0203] In some embodiments, the second portion 143 protrudes from the first surface 1421 by a size less than or equal to the sum of the thicknesses of the plurality of stacked first tabs 1311.

[0204] In the above scheme, along the direction from the first main body 130 to the tab connection 140, the second part 143 protrudes from the first part 142, and the protruding part does not extend beyond the side of the first tab 131 away from the first main body 130. This allows the tab connection 140 to be locally thickened, that is, the second part 143 to make reasonable use of the space where the first tab 131 is located without occupying additional space. This allows the battery cell 10 to have a higher volumetric energy density under the condition of increasing the charge and discharge rate of the battery cell 10 by locally thickening the tab connection 140.

[0205] Alternatively, in some other embodiments, along the direction from the first main body portion 130 to the tab connection portion 140, the side of the second portion 143 opposite to the first main body portion 130 extends beyond the side of the first tab 131 opposite to the first main body portion 130.

[0206] According to some embodiments of this application, please refer to Figure 8 The first part 142 is coplanar with the side of the first main body 130 along the first direction y and the side of the second part 143 along the first direction y.

[0207] Optionally, the first portion 142 has a second surface 1422 facing the first body portion 130 along the first direction y, and a first side surface 1420 connects the first surface 1421 and the second surface 1422. The second portion 143 has a third surface 1430 facing the first body portion 130 along the first direction y, and the second surface 1422 and the third surface 1430 are coplanar.

[0208] Along the first direction y, the first surface 1421 and the second surface 1422 are disposed opposite to each other and are connected by the first side surface 1420. The first surface 1421 is disposed away from the first main body 130, and the second surface 1422 is disposed facing the first main body 130.

[0209] Along the first direction y, the second part 143 has a third surface 1430 facing the first main body 130. The third surface 1430 is connected to the second surface 1422 and the two are coplanar. It can be understood that the tab connection part 140 is locally thickened, and the thickened and protruding part is located on the side of the tab connection part 140 away from the first main body 130.

[0210] In the above solution, by coplanarizing the second surface 1422 of the first part 142 and the third surface 1430 of the second part 143, one side of the second part 143 protrudes from the first part 142 along the first direction y, and the other side is coplanar with the first part 142, thereby playing a foolproof role, effectively reducing the difficulty of assembling and positioning the first tab 131 and the tab connection part 140, which is conducive to improving the manufacturing efficiency of the battery cell 10, and thus conducive to improving the manufacturing efficiency of the battery device 100.

[0211] In some other embodiments, the second surface 1422 and the third surface 1430 are not coplanar. In some embodiments where the thickness of the second portion 143 is greater than the thickness of the first portion 142, the second surface 1422 may be closer to the first main body portion 130 than the third surface 1430, or the third surface 1430 may be closer to the first main body portion 130 than the second surface 1422.

[0212] According to some embodiments of this application, please refer to Figure 8 The first electrode ear 1314 has a first end 1310 that is away from the first main body portion 130. Along the second direction x, the second portion 143 is spaced apart from the first end 1310.

[0213] In some embodiments, the first electrode ear 1314 has a first end 1310 away from the first main body 130. The first end 1310 can be the free end of the first electrode ear 1314, and the other end of the first electrode ear 1314 is connected to the first main body 130 through a bent section 1313.

[0214] Along the second direction x, the first end 1310 and the second part 143 are spaced apart, that is, the part of the electrode connection 140 that is partially thickened is spaced apart from the first end 1310 along the first direction y.

[0215] In the above scheme, by setting the second part 143 and the first end 1310 at intervals, the risk of mutual interference between the first tab 131 and the locally thickened part of the tab connection 140 can be reduced, resulting in high structural reliability of the battery cell 10 and improving the reliability of the battery device 100.

[0216] In some other embodiments, please refer to Figure 10 , Figure 10This is a schematic diagram of the second portion 143 and the first end 1310 in some other embodiments of this application. Along the second direction x, the second portion 143 and the first end 1310 are in contact with each other.

[0217] In some other embodiments, the first end 1310 may overlap the second portion 143 on the side opposite to the first main body portion 130.

[0218] According to some embodiments of this application, please refer to Figure 11 , Figure 11 This is an exploded perspective view of the battery cell 10 in some other embodiments of this application.

[0219] The first electrode assembly 13 also includes a second electrode tab 132, which is disposed on the first main body portion 130 and is electrically connected to the electrode tab connection portion 140.

[0220] The first electrode 131 and the second electrode 132 have the same polarity, and both are electrically connected to the electrode connection part 140.

[0221] Optionally, the second electrode 132 is disposed on one side of the first main body portion 130 along the first direction y, for example, the first electrode 131 and the second electrode 132 are disposed on the same side. Optionally, the second electrode 132 may be disposed in other parts of the first main body portion 130.

[0222] The electrode connecting part 140 is electrically connected to the second electrode 132. The electrode connecting part 140 can be electrically connected to the second electrode 132 by means of welding, riveting, threaded connection, etc. For example, the electrode connecting part 140 is welded to the second electrode 132, and the welding form includes, but is not limited to, ultrasonic welding or laser welding.

[0223] In the above scheme, the first electrode assembly 13 also includes a second tab 132, which is electrically connected to the tab connection portion 140. This can effectively increase the electrical connection area between the first electrode assembly 13 and the first current collector 14, which is beneficial to improving the overcurrent capacity, thereby improving the charge and discharge rate of the battery cell 10, and further improving the charge and discharge performance of the battery device 100.

[0224] According to some embodiments of this application, please refer to Figure 11 The second electrode 132 and the first electrode 131 are both disposed on the same side of the first main body 130 along the first direction y, and the first electrode 131 and the second electrode 132 do not overlap on the electrode connecting part 140.

[0225] In some embodiments, on the tab connection portion 140, the first tab 131 and the second tab 132 do not overlap each other, and are spaced apart from each other in the second direction x.

[0226] Optionally, the second electrode 132 may be connected to the side of the electrode connecting portion 140 facing the first main body portion 130.

[0227] Optionally, the second electrode 132 may be connected to the side of the electrode connector 140 opposite to the first main body 130.

[0228] Compared to the scheme where the first tab 131 and the second tab 132 overlap, the above scheme, by setting the first tab 131 and the second tab 132 to not overlap, can reduce the space occupied by the overlapping part of the first tab 131 and the second tab 132 on the internal space of the battery cell 10, which is conducive to improving the volumetric energy density of the battery cell 10. On the other hand, it can provide space for the locally thickened part of the tab connection 140, so that the battery cell 10 has a higher charge and discharge rate, which is conducive to improving the charge and discharge performance of the battery device 100.

[0229] According to some embodiments of this application, please refer to Figure 11 The tab connection portion 140 further includes a third portion 144, which is located between the first portion 142 and the third portion 144 along the second direction x. Along the first direction y, the thickness of the second portion 143 is greater than the thickness of the third portion 144. The second tab 132 also includes a second tab portion 1320, which is located on one side of the third portion 144 along the first direction y and is connected to the third portion 144. On the same projection plane perpendicular to the second direction x, the projection of the second tab portion 1320 at least partially overlaps with the projection of the second portion 143.

[0230] Optionally, the second part 143 protrudes from the third part 144 on one side facing the first body part 130 along the first direction y.

[0231] Optionally, the second part 143 protrudes from the third part 144 on the side opposite to the first main body part 130 along the first direction y.

[0232] The second electrode ear 1320 may be located on the side of the third part 144 facing away from the first main body part 130 along the first direction y, or the second electrode ear 1320 may be located on the side of the third part 144 facing the first main body part 130 along the first direction y.

[0233] On the same projection plane perpendicular to the second direction x, the projection of the second pole ear 1320 and the projection of the second part 143 at least partially overlap, which can be understood as the second part 143 being able to utilize the space to the side of the second pole ear 1320. For example, the second pole ear 1320 can be located on the side of the third part 144 away from the first main body 130 along the first direction y, and the second part 143 protrudes from the side of the third part 144 away from the first main body 130 along the first direction y; or, for another example, the second pole ear 1320 can be located on the side of the third part 144 facing the first main body 130 along the first direction y, and the second part 143 protrudes from the side of the third part 144 facing the first main body 130 along the first direction y.

[0234] For example, the third portion 144 has a second side surface 1440 that faces away from the second portion 143 along the second direction x, and a fourth surface 1441 that faces away from the second main body portion 150 along the first direction y. The second tab 132 bypasses the second side surface 1440 and connects to the fourth surface 1441. Along the first direction y, the thickness of the second portion 143 is greater than the thickness of the third portion 144, and the second portion 143 protrudes from the fourth surface 1441.

[0235] In some embodiments, the tab connector 140 further includes a third portion 144. The first portion 142, the second portion 143, and the third portion 144 are arranged along a second direction x, and the second portion 143 connects the first portion 142 and the third portion 144. The thickness of the second portion 143 is greater than the thickness of the third portion 144, and the thickness of the third portion 144 may be equal to the thickness of the first portion 142.

[0236] Optionally, the surfaces of the first portion 142 facing the first main body portion 130, the second portion 143 facing the first main body portion 130, and the third portion 144 facing the first main body portion 130 are coplanar.

[0237] Along the second direction x, one side of the third part 144 is connected to the second part 143, and the other side of the third part 144 is the second side 1440. The second side 1440 is positioned opposite to the first side 1420.

[0238] Along the first direction y, the third portion 144 has a fourth surface 1441 facing away from the first body portion 130. A second tab 132 extends from one side of the first body portion 130 along the first direction y and is bent to bypass the second side surface 1440 and connect to the fourth surface 1441. Exemplarily, the second tab 132 includes a bent section and a second tab portion 1320, the second tab portion 1320 being connected to the first body portion 130 via the bent section and electrically connected to the fourth surface 1441.

[0239] For example, the second tab 132 includes a plurality of second tab pieces, which are connected to either a positive or negative electrode piece. The plurality of second tab pieces are stacked and folded together along a first direction y to form the second tab 132, and the free end of the second tab 132 is oriented toward the second direction x. The second tab 132 is then folded over to bypass the second side 1440 of the third portion 144 and stacked with the fourth surface 1441.

[0240] In some embodiments, the second portion 143 protrudes from the fourth surface 1441. Optionally, the first surface 1421 and the fourth surface 1441 may be in the same plane.

[0241] Optionally, in some embodiments, along the direction from the first main body portion 130 to the tab connection portion 140, the side of the second portion 143 away from the first main body portion 130 does not exceed the side of the second tab 132 away from the first main body portion 130.

[0242] Optionally, the second electrode 132 has a second end that is away from the first main body portion 130. Along the second direction x, the second portion 143 is spaced apart from the second end.

[0243] In the above scheme, the part of the second part 143 that protrudes from the first part 142 can utilize the space on the side of the second tab 1320 to achieve space sharing between the second tab 132 and the tab connection part 140, making the battery cell 10 structure compact and conducive to improving the volumetric energy density of the battery cell 10. Furthermore, by setting the thickness of the second part 143 to be greater than the thickness of the third part 144, the tab connection part 140 can have a higher current carrying capacity to effectively carry the input and output of current between the first electrode terminal 12 and the first electrode assembly 13, so that the battery device 100 has a higher charge and discharge performance.

[0244] According to some embodiments of this application, please refer to Figure 4 and Figure 7 The battery cell 10 also includes a second electrode assembly 15, and the first electrode assembly 13 and the second electrode assembly 15 are arranged along a second direction x. The second electrode assembly 15 includes a second main body portion 150 and a third tab 151. The third tab 151 is disposed on one side of the second main body portion 150 along the first direction y, and the third tab 151 is electrically connected to the tab connection portion 140.

[0245] In some embodiments, a battery cell 10 may include a plurality of battery cells 10, such as two, three, four or more.

[0246] Optionally, the battery cell 10 further includes a second electrode assembly 15, which is arranged along a second direction x with the first electrode assembly 13. The second electrode assembly 15 includes a second body portion 150 and a third tab 151. The second body portion 150 and the first body portion 130 are stacked together along the second direction x. A second electrode is disposed on one side of the second body portion 150 along a first direction y, and the third tab 151 is disposed on the same side as the first tab 131. In some embodiments, the first tab 131 and the third tab 151 may have the same polarity.

[0247] In some embodiments, the first electrode 131 and the third electrode 151 may be arranged along the second direction x.

[0248] The third electrode tab 151 and the electrode connecting part 140 can be electrically connected by means of welding, riveting, threaded connection, etc. For example, the third electrode tab 151 and the electrode connecting part 140 are welded together, and the welding method includes, but is not limited to, laser welding or ultrasonic welding.

[0249] Optionally, the third tab 151 can be electrically connected to the first portion 142. Optionally, the third tab 151 can be electrically connected to the second portion 143. Optionally, the tab connection portion 140 further includes a third portion 144, which is located on the side of the second portion 143 opposite to the first portion 142, and the third tab 151 is electrically connected to the third portion 144.

[0250] In the above solution, by providing a second electrode assembly 15 inside the housing 11 and electrically connecting the third tab 151 of the second electrode assembly 15 to the tab connection portion 140, the volumetric energy density of the battery cell 10 can be effectively improved, and the capacity or voltage of the battery cell 10 can be increased.

[0251] According to some embodiments of this application, please refer to Figure 4 On the tab connection portion 140, the first tab 131 and the third tab 151 do not overlap.

[0252] In some embodiments, on the tab connection portion 140, the first tab 131 and the third tab 151 do not overlap, and are spaced apart from each other in the second direction x.

[0253] Optionally, the third tab 151 may be connected to the side of the tab connecting portion 140 facing the first main body portion 130. In some embodiments where the third tab 151 is connected to the side of the tab connecting portion 140 facing the first main body portion 130, the first main body portion 130 may be connected to the side of the second portion 143 facing the first main body portion 130, or it may be connected to the side of the third portion 144 facing the first main body portion 130.

[0254] Optionally, the third electrode 151 may be connected to the side of the electrode connection portion 140 opposite to the first main body portion 130.

[0255] In some embodiments where the third electrode tab 151 is connected to the electrode tab connection portion 140 on the side opposite to the first main body portion 130, the third electrode tab 151 may be connected to the side opposite to the first main body portion 130 of the second portion 143, or it may be connected to the side opposite to the first main body portion 130 of the third portion 144.

[0256] Compared to the scheme where the first tab 131 and the third tab 151 overlap, the above scheme, by setting the first tab 131 and the third tab 151 to not overlap, can reduce the space occupied by the overlapping part of the first tab 131 and the third tab 151 on the internal space of the battery cell 10, which is conducive to improving the volumetric energy density of the battery cell 10; on the other hand, it can provide space for the locally thickened part of the tab connection 140, so that the battery cell 10 has a higher charge and discharge rate, which is conducive to improving the charge and discharge performance of the battery device 100.

[0257] According to some embodiments of this application, please refer to Figure 4 The tab connection portion 140 further includes a third portion 144. Along the second direction x, the second portion 143 is located between the first portion 142 and the third portion 144. Along the first direction y, the thickness of the second portion 143 is greater than the thickness of the third portion 144. The third tab 151 includes a third tab portion 1510, which is located on one side of the third portion 144 along the first direction y, and is connected to the third portion 144. On the same projection plane perpendicular to the second direction x, the projection of the third tab portion 1510 at least partially overlaps with the projection of the second portion 143.

[0258] Optionally, along the first direction y, the third part 144 is away from the fourth surface of the first main body 130, and along the second direction x, one side of the third part 144 is connected to the second part 143, and the other side of the third part 144 is the second side surface 1440.

[0259] Optionally, the second part 143 protrudes from the third part 144 on the side facing the first body part 130 along the first direction y.

[0260] Optionally, the second part 143 protrudes from the third part 144 on the side opposite to the first main body part 130 along the first direction y.

[0261] The third pole ear 1510 may be located on the side of the third part 144 facing away from the first main body part 130 along the first direction y, or the third pole ear 1510 may be located on the side of the third part 144 facing the first main body part 130 along the first direction y.

[0262] On the same projection plane perpendicular to the second direction x, the projection of the third pole ear 1510 and the projection of the second part 143 at least partially overlap. This can be understood as the portion of the second part 143 protruding from the first part 142 utilizing the space on the side of the third pole ear 1510. For example, the third pole ear 1510 can be located on the side of the third part 144 facing away from the first main body 130 along the first direction y, and the second part 143 protrudes from the side of the third part 144 facing away from the first main body 130 along the first direction y. Or, for another example, the third pole ear 1510 can be located on the side of the third part 144 facing the first main body 130 along the first direction y, and the second part 143 protrudes from the side of the third part 144 facing the first main body 130 along the first direction y.

[0263] Optionally, the tab connector 140 further includes a third portion 144. The first portion 142, the second portion 143, and the third portion 144 are arranged along a second direction x, and the second portion 143 connects the first portion 142 and the third portion 144. The thickness of the second portion 143 is greater than the thickness of the third portion 144, and the thickness of the third portion 144 may be equal to the thickness of the first portion 142.

[0264] Optionally, the surfaces of the first portion 142 facing the first main body portion 130, the second portion 143 facing the first main body portion 130, and the third portion 144 facing the first main body portion 130 are coplanar. Along the second direction x, one side of the third portion 144 is connected to the second portion 143, and the other side of the third portion 144 is a second side surface 1440. The second side surface 1440 is disposed opposite to the first side surface 1420. Along the first direction y, the third portion 144 has a fourth surface 1441 facing away from the first main body portion 130. A third tab 151 extends from one side of the first main body portion 130 along the first direction y and is bent to bypass the second side surface 1440 and connect to the fourth surface 1441. Exemplarily, the third tab 151 includes a bent section and a third tab portion 1510, the third tab portion being connected to the first main body portion 130 via the bent section, and the third tab portion 1510 being electrically connected to the fourth surface 1441.

[0265] For example, the third tab 151 includes a plurality of third tab 151 pieces, which are connected to one of the positive or negative electrode pieces. The plurality of third tab 151 pieces are stacked and folded together along the first direction y to form the third tab 151, and the free end of the third tab 151 is oriented toward the second direction x. Then the third tab 151 is folded to bypass the second side 1440 of the third portion 144 and is stacked with the fourth surface 1441.

[0266] In some embodiments, the second portion 143 protrudes from the fourth surface 1441. Optionally, the first surface 1421 and the fourth surface 1441 may be in the same plane.

[0267] Optionally, in some embodiments, along the direction from the first main body portion 130 to the tab connection portion 140, the side of the second portion 143 away from the first main body portion 130 does not extend beyond the side of the third tab 151 away from the second main body portion 150.

[0268] Optionally, the third pole ear 1510 has a second end that is away from the second main body portion 150. Along the second direction x, the second portion 143 is spaced apart from the second end.

[0269] In the above scheme, the part of the second part 143 that protrudes from the first part 142 can utilize the space on the side of the third tab 1510, making the battery cell 10 structure compact and improving the volumetric energy density of the battery cell 10. Furthermore, by setting the thickness of the second part 143 to be greater than the thickness of the third part 144, the tab connection 140 can have a higher current carrying capacity, so as to effectively carry the input and output of current between the electrode terminals, the first electrode assembly 13 and the second electrode assembly 15, and thus the battery device 100 has high charge and discharge performance.

[0270] According to some embodiments of this application, the thickness of the first portion 142 is equal to the thickness of the third portion 144.

[0271] In some embodiments, the thickness of the first portion 142 is equal to the thickness of the third portion 144, and the second portion 143 is greater than the thickness of the first portion 142 and greater than the thickness of the third portion 144.

[0272] Optionally, the tab connection portion 140 is a one-piece structure, which can be manufactured by casting or die casting. Optionally, the tab connection portion 140 is a split structure, for example, by providing a thickened plate in a certain part of the substrate to form a first part 142, a second part 143 and a third part 144.

[0273] In the above scheme, the thickness of the first part 142 is the same as that of the third part 144, which makes the overcurrent consistency between the tab connection part 140 and the first tab 131, and between the tab connection part 140 and the third tab 151 good. By setting a second part 143 with a larger thickness between the first part 142 and the third part 144, it is beneficial to improve the charge and discharge rate of the battery cell 10, thereby enabling the battery device 100 to have higher charge and discharge performance.

[0274] In some other embodiments, the thickness of the first portion 142 is not the same as the thickness of the second portion 143.

[0275] According to some embodiments of this application, please refer to Figure 12 and Figure 13 , Figure 12This is a schematic diagram of the first electrode tab 131 and the electrode tab connection portion 140 in some embodiments of this application. Figure 13 This is a partial structural diagram of the first electrode tab 1311 and the electrode tab connection portion 140 in some embodiments of this application. The first electrode tab 131 includes a plurality of stacked first electrode tabs 1311, which are welded together to form a first solder mark portion 1312.

[0276] The first tab 131 includes a plurality of first tab pieces 1311, which are connected to either a positive or negative electrode piece. The plurality of first tab pieces 1311 are stacked and gathered along a first direction y to form the first tab 131.

[0277] The first solder joint 1312 is a portion formed by welding together multiple stacked first electrode tabs 1311. The welding methods for the multiple stacked first electrode tabs 1311 include, but are not limited to, ultrasonic welding or laser welding.

[0278] For example, before the first electrode tab 131 is electrically connected to the electrode tab connection portion 140, the multiple stacked first electrode tab pieces 1311 are pre-welded together to form a structurally stable and compact first electrode tab 131.

[0279] In the above scheme, multiple first tabs 1311 are welded together to be integrated into one unit through the first soldering part 1312. On the one hand, this reduces the risk of multiple first tabs 1311 being loose and affecting the current carrying capacity. On the other hand, it can effectively reduce the difficulty of electrical connection between the first tabs 131 and the tab connection part 140, which is conducive to improving the manufacturing efficiency of the battery cell 10.

[0280] According to some embodiments of this application, please refer to Figure 12 and Figure 13 The first electrode tab 131 is welded to the electrode tab connecting part 140 to form the second solder mark part 145.

[0281] In some embodiments, the first tab 131 is welded to the first portion 142 to form a second solder mark 145. The second solder mark 145 may be a solder mark formed by welding.

[0282] Optionally, the welding method between the first part 142 and the first tab 131 includes, but is not limited to, laser welding or ultrasonic welding.

[0283] Optionally, the shape of the first solder mark 1312 can be other shapes such as strip, circle, ring or triangle.

[0284] In the above scheme, the first electrode tab 131 and the electrode tab connecting part 140 are electrically connected by welding process, so that the connection quality between the first electrode tab 131 and the electrode tab connecting part 140 is high and the electrical connection efficiency between the two is high.

[0285] According to some embodiments of this application, on the same projection plane perpendicular to the first direction y, the ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 is greater than or equal to 5% and less than or equal to 30%.

[0286] In some embodiments, on the same projection plane perpendicular to the first direction y, the ratio of the total projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 can be 5%, 6%, 7%, 8%, 9%...25%, 26%, 27%, 28%, 29%, 30% or any value between two adjacent values.

[0287] Optionally, images of the first tab 131 and the second solder mark 145 are acquired along the first direction y, and the areas of the first tab 131 and the second solder mark 145 are calculated using relevant software.

[0288] In the above scheme, the ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 is greater than or equal to 5%, which can ensure high electrical connection quality between the tab connection 140 and the first tab 131, reduce the risk of separation between the two, and facilitate the improvement of overcurrent capacity, so that the battery cell 10 has a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 is less than or equal to 30%, which can reduce the difficulty of welding, avoid the risk of damage to the structure of the first electrode assembly 13 due to excessive welding range during the welding process, and make the structure of the battery cell highly reliable.

[0289] In some other embodiments, on the same projection plane perpendicular to the first direction y, the ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 may be less than 5%, for example 4%, or may be greater than 30%, for example 40%.

[0290] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 10% and less than or equal to 20%.

[0291] In some embodiments, on the same projection plane perpendicular to the first direction y, the ratio of the total projected area of ​​the second solder mark 145 to the projected area of ​​the first tab 131 can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or any value between two adjacent values.

[0292] In the above scheme, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is greater than or equal to 10%, which can further improve the electrical connection quality between the electrode tab connection and the first electrode tab, reduce the risk of separation between the two, and facilitate the improvement of overcurrent capacity, so that the battery cell has a larger charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first electrode tab is less than or equal to 20%, which can effectively reduce the difficulty of welding, avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, and make the structure of the battery cell highly reliable.

[0293] According to some embodiments of this application, please refer to Figure 12 The second solder mark 145 is strip-shaped and extends along the third direction z, with the first direction y, the second direction x and the third direction z being perpendicular to each other.

[0294] In some embodiments, the second solder mark 145 is strip-shaped and extends in the third direction z. Optionally, as... Figure 12 As shown, the second solder mark 145 is generally elongated, with its length direction being the third direction z. The third direction z, the second direction x, and the first direction y are perpendicular to each other.

[0295] Optionally, the number of second solder marks 145 can be one, two, three, or more. When there are multiple second solder marks 145, the multiple solder marks can be arranged along the second direction x.

[0296] In the above scheme, the second solder mark 145 is strip-shaped and extends along the third direction z, so that the second solder mark 145 can effectively connect the first tab 131 and the tab connection part 140 into one unit, reducing the risk of the first tab 131 and the tab connection part 140 separating from each other, making the battery cell 10 structurally reliable, and thus improving the reliability of the battery device 100.

[0297] In some other embodiments, the second solder mark 145 may also be formed in other shapes such as circular, annular, or triangular.

[0298] According to some embodiments of this application, please refer to Figure 12 and Figure 13 On the same projection plane perpendicular to the first direction y, the projection of the second solder mark 145 at least partially overlaps with the projection of the first solder mark 1312.

[0299] In some embodiments, a plurality of first tabs 1311 are stacked and pre-welded to form a first tab 131, and a first solder mark 1312 is formed at the welding location. The first portion 142 of the tab connection portion 140 is stacked with the first tab 131 and the two are welded to each other. The welding location is located at the location of the first solder mark 1312, so that the projections of the first solder mark 1312 and the second solder mark 145 on the same projection plane perpendicular to the first direction y at least partially overlap.

[0300] At least partial overlap can be understood as the projection of the second solder mark 145 and the projection of the first solder mark 1312 on the same projection plane perpendicular to the first direction y, which can partially overlap or completely overlap.

[0301] Taking partial overlap as an example, the projected area of ​​the second solder mark 145 is larger than the projected area of ​​the first solder mark 1312, and the projection of the second solder mark 145 covers the projection of the first solder mark 1312, meaning that a portion of the projection of the second solder mark 145 does not overlap with the projection of the first solder mark 1312. Alternatively, the projected area of ​​the first solder mark 1312 is larger than the projected area of ​​the second solder mark 145, and the projection of the first solder mark 1312 covers the projection of the second solder mark 145, meaning that a portion of the projection of the first solder mark 1312 does not overlap with the projection of the second solder mark 145. Alternatively, a portion of the projection of the second solder mark 145 overlaps with a portion of the projection of the first solder mark 1312, while another portion of the projection of the second solder mark 145 does not overlap with another portion of the projection of the first solder mark 1312.

[0302] Complete overlap can be understood as the projections of the first solder mark 1312 and the second solder mark 145 overlapping each other on the same projection plane perpendicular to the first direction y, with the two having the same area.

[0303] In the above scheme, on the same projection plane perpendicular to the first direction y, the projection of the second solder mark 145 overlaps at least partially with the projection of the first solder mark 1312, so that the tab connection 140 can be electrically connected to all the first tab pieces 1311, thereby effectively improving the charge and discharge rate of the battery cell 10, and thus effectively improving the charge and discharge performance of the battery device 100.

[0304] According to some embodiments of this application, on the same projection plane perpendicular to the first direction y, the projection of the first solder mark 1312 covers the projection of the second solder mark 145, and the ratio of the projection area of ​​the second solder mark 145 to the projection area of ​​the first solder mark 1312 is greater than or equal to 30% and less than or equal to 80%.

[0305] In some embodiments, on the same projection plane perpendicular to the first direction y, the projection of the first solder mark 1312 covers the projection of the second solder mark 145, that is, the projection of the second solder mark 145 falls completely into the projection of the first solder mark 1312.

[0306] In some embodiments where the projection of the first solder mark 1312 covers the projection of the second solder mark 145, the ratio of the total projected area of ​​the second solder mark 145 to the total projected area of ​​the first solder mark 1312 can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%...75%, 76%, 77%, 78%, 79%, 80% or any value between two adjacent values.

[0307] Optionally, images of the first solder mark 1312 and the second solder mark 145 are acquired along the first direction y, and the areas of the first solder mark 1312 and the second solder mark 145 are calculated using relevant software.

[0308] In the above scheme, the projection of the second solder mark 145 is covered by the projection of the first solder mark 1312, and the ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first solder mark 1312 is greater than or equal to 30%. This ensures that the tab connection 140 effectively has a high electrical connection quality with the pre-welded joints of the multiple first tab pieces 1311, which is beneficial to improving the overcurrent capacity and giving the battery cell 10 a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first solder mark 1312 is less than or equal to 80%, which can reduce the difficulty of welding and avoid the risk of damage to the structure of the first electrode assembly 13 due to excessive welding range during the welding process, thus making the structure of the battery cell 10 highly reliable.

[0309] In some other embodiments, on the same projection plane perpendicular to the first direction y, the ratio of the projected area of ​​the second solder mark 145 to the projected area of ​​the first solder mark 1312 may be less than 30%, for example 20%, or may be greater than 80%, for example 90%, 95% or 100%.

[0310] According to some embodiments of this application, on the same projection plane perpendicular to the first direction y, the projection of the first solder mark 1312 covers the projection of the second solder mark 145, and the ratio of the projection area of ​​the second solder mark 145 to the projection area of ​​the first solder mark 1312 is greater than or equal to 50% and less than or equal to 70%.

[0311] In some embodiments where the projection of the first solder mark 1312 covers the projection of the second solder mark 145, the ratio of the total projected area of ​​the second solder mark 145 to the total projected area of ​​the first solder mark 1312 can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%...65%, 66%, 67%, 68%, 69%, 70% or any value between two adjacent values.

[0312] In the above scheme, the ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is greater than or equal to 50%, which further enables the electrode connection part to have a high electrical connection quality with the pre-welded joint of multiple first electrode tabs, which is conducive to improving the overcurrent capacity and enabling the battery cell to have a large charge and discharge rate. The ratio of the projected area of ​​the second solder mark to the projected area of ​​the first solder mark is less than or equal to 70%, which can effectively reduce the welding difficulty and avoid the risk of damage to the structure of the first electrode assembly due to excessive welding range during the welding process, thus making the structure of the battery cell highly reliable.

[0313] According to some embodiments of this application, please refer to Figure 12 and Figure 13 The first electrode tab 1311 has a first edge 160, a second edge 161 and a third edge 162. The first edge 160 and the second edge 161 are disposed opposite each other along the third direction z. The first edge 160 is farther away from the first wall 112 than the second edge 161. The third edge 162 extends along the third direction z and connects the first edge 160 and the second edge 161. The angle between the third edge 162 and the first edge 160 is greater than 90° and less than or equal to 140°. The first direction y, the second direction x and the third direction z are perpendicular to each other.

[0314] The outer edge of the first pole lug 1311 includes a first edge 160, a second edge 161, and a third edge 162. The first edge 160 and the second edge 161 are disposed opposite each other along a third direction z. The first edge 160 is further away from the first wall 112 than the second edge 161. Figure 12 For example, the first edge 160 can be the upper edge of the first tab 1311, and the second edge 161 can be the lower edge of the first tab 1311. The third edge 162 connects the first edge 160 and the second edge 161, and the third edge 162 extends along the third direction z.

[0315] Please see Figure 12The angle α between the third edge 162 and the first edge 160 can be greater than 90° and less than or equal to 140°. For example, the angle α between the third edge 162 and the first edge 160 can be 91°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140° or any value between two adjacent values.

[0316] The angle α between the third edge 162 and the first edge 160 can be greater than 90° and less than or equal to 120°. This can be understood as the first pole tab 1311 being away from the first wall 112 and the interior angle of the first main body 130 being greater than 90° and less than 140°.

[0317] For example, the end wall of the first pole tab 1311 that is away from the first wall 112 and away from the first main body portion 130 can be partially cut so that the angle α between the third edge 162 and the first edge 160 can be greater than 90° and less than or equal to 140°.

[0318] In the above solution, by setting the angle of the end of the first tab 1311 away from the first main body 130, that is, the angle between the third edge 162 and the first edge 160, to be greater than 90° and less than or equal to 140°, the risk of wrinkles or folds occurring during the bending of the first tab 1311 to bypass the first side 1420, causing the first tab 1311 to insert into the first main body 130 and resulting in a short circuit inside the battery cell 10, can be effectively reduced. This makes the battery cell 10 have higher reliability, and thus the battery device 100 has higher reliability.

[0319] According to some embodiments of this application, the angle between the third edge 162 and the first edge 160 is greater than or equal to 95° and less than 135°.

[0320] The angle α between the third edge 162 and the first edge 160 can be 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135° or any value between two adjacent values.

[0321] In the above solution, by setting the angle between the third edge 162 and the first edge 160 to be greater than or equal to 95° and less than or equal to 135°, the risk of wrinkles or folds occurring during the bending of the first electrode tab 1311 to bypass the first side 1420, causing the first electrode tab 1311 to insert into the first main body 130 and resulting in a short circuit inside the battery cell 10, can be further reduced. This makes the battery cell 10 have higher reliability, and thus makes the battery device 100 have higher reliability.

[0322] According to some embodiments of this application, please refer to Figure 12or Figure 14 , Figure 14 This is a schematic diagram of the first electrode tab and the electrode tab connection portion in other embodiments of this application.

[0323] Along the direction from the first wall 112 to the first electrode assembly 13, the side of the tab connection portion 140 away from the first wall 112 extends beyond the side of the first tab 131 away from the first wall 112.

[0324] In some embodiments, in the direction from the first wall 112 to the first electrode assembly 13, the tab connection portion 140 extends beyond the first tab 131. This can be understood as the dimension of the tab connection portion 140 along a third direction z being greater than the dimension of the first tab 131 along a third direction z. Optionally, the tab connection portion 140 is lengthened to extend beyond the first tab 131. Optionally, the first tab 131 is shortened, that is, the dimension of the first tab 131 along a third direction z is smaller than the dimension of the first body portion 130 along a third direction z, so that the tab connection portion 140 can extend beyond the first tab 131.

[0325] In some embodiments, along the direction of the first wall 112 pointing to the first electrode assembly 13, the tab connection portion 140 extends beyond the first tab 131. It can be understood that the tab connection portion 140 is located entirely on the side of the tab connection portion 140 away from the first main body portion 130.

[0326] In the above scheme, along the direction from the first wall 112 to the first electrode assembly 13, the tab connection portion 140 extends beyond the first tab 131, so that the portion of the first tab 131 that bypasses the first side 1420 is entirely disposed on the tab connection portion 140, reducing the risk of the first tab 131 being inserted into the first main body portion 130 and causing a short circuit inside the battery cell 10, thus making the battery cell 10 have higher reliability, and consequently making the battery device 100 have higher reliability.

[0327] Alternatively, in some other embodiments, the dimension of the first tab 131 along the third direction z may be the same as the dimension of the first body portion 130 along the third direction z.

[0328] Alternatively, in some other embodiments, along the direction from the first wall 112 to the first electrode assembly 13, the side of the tab connection portion 140 away from the first wall 112 does not extend beyond the side of the first tab 131 away from the first wall 112.

[0329] According to some embodiments of this application, please refer to Figure 14 Along the direction of the first wall 112 toward the first electrode assembly 13, the tab connection portion 140 has a fourth portion 146 that extends beyond the first tab 131, and the thickness of the fourth portion 146 is less than or equal to the thickness of the first portion 142.

[0330] Optionally, the electrode connecting portion 140 includes a first portion 142, a second portion 143, a third portion 144, and a fourth portion 146. The first portion 142, the second portion 143, and the third portion 144 are arranged along a second direction x and form a whole. The whole formed by the first portion 142, the second portion 143, and the third portion 144 and the fourth portion 146 are arranged along a third direction z, and the fourth portion 146 extends beyond the first electrode 131 on the side opposite to the first wall 112.

[0331] In some embodiments, the thickness of the fourth portion 146 may be less than the thickness of the second portion 143.

[0332] Optionally, the thickness of the fourth part 146 can be equal to the thickness of the first part 142. Optionally, the thickness of the fourth part 146 can be equal to the thickness of the third part 144.

[0333] Optionally, the thickness of the fourth part 146 may be less than the thickness of the first part 142. Optionally, the thickness of the fourth part 146 may be less than the thickness of the third part 144.

[0334] In the above scheme, the fourth part 146 can play a protective role, reducing the risk of the first tab 131 being inserted into the first main body 130 during the folding process, thus making the structure of the battery cell 10 highly reliable; at the same time, by setting the thickness of the fourth part 146 to be less than or equal to the thickness of the first part 142, the impact of the fourth part 146 on the energy density of the battery cell is reduced.

[0335] According to some embodiments of this application, please refer to Figure 12 or Figure 14 Along the direction of the first wall 112 toward the first electrode assembly 13, the side of the first main body 130 that is away from the first wall 112 extends beyond the side of the tab connection 140 that is away from the first wall 112.

[0336] In some embodiments, the dimension of the tab connection portion 140 along the third direction z can be smaller than the dimension of the first body portion 130 along the third direction z, such as... Figure 12 As shown, the side of the first main body 130 that is away from the first wall 112 extends beyond the side of the tab connection 140 that is away from the first wall 112.

[0337] In the above scheme, along the direction from the first wall 112 to the first electrode assembly 13, the side of the first main body 130 away from the first wall 112 extends beyond the side of the tab connection 140 away from the first wall 112, so that the length of the tab connection 140 is appropriate, reducing the risk that the length of the tab connection 140 is too large and affects the volumetric energy density and mass energy density of the battery cell 10, so that the battery device 100 has a high energy density.

[0338] According to some embodiments of this application, please refer to Figure 4 The first electrode assembly 13 further includes a fourth electrode tab, the polarity of which is opposite to that of the first electrode tab 131. Along the first direction y, the fourth electrode tab is disposed on the other side of the first main body portion 130. The battery cell 10 also includes a second electrode terminal 17 and a second current collector 18. The second electrode terminal 17 is disposed on the first wall 112, and the second electrode terminal 17 and the first electrode terminal 12 are arranged along the first direction y. The second current collector 18 is used to electrically connect the fourth electrode tab and the second electrode terminal 17.

[0339] In some embodiments, the first electrode assembly 13 further includes a fourth tab, which has the opposite polarity to the first tab 131, and is connected to the other of the positive or negative electrode plates. The first tab 131 and the fourth tab are respectively disposed on opposite sides of the first main body portion 130 along the first direction y.

[0340] In some embodiments, a second electrode terminal 17 is also provided on the first wall 112. The second electrode terminal 17 and the first electrode terminal 12 are spaced apart along the first direction y. The second electrode terminal 17 is electrically connected to the fourth electrode ear through the second current collector 18.

[0341] Optionally, the second current collector 18 may have the same structure as the first current collector 14. For example, the second current collector 18 may be locally thickened to form a second part 143 with a larger thickness.

[0342] In the above scheme, a second electrode terminal 17 is provided on the first wall 112. The second electrode terminal 17 is connected to the third electrode tab through the second current collector 18, so that the battery cell 10 can realize the output or input of positive and negative current on the same end, so as to facilitate the electrical connection of two adjacent battery cells 10 in the battery device 100, reduce the difficulty of assembling the battery device 100, and make the manufacturing efficiency of the battery device 100 high.

[0343] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0344] In some embodiments, the capacity of a single battery cell 10 can refer to the total amount of charge stored in a single battery cell 10, and its unit can be Ah, ampere-hour.

[0345] In some embodiments, the capacity of the battery cell 10 provided above may be greater than or equal to 500Ah, such as 500Ah, 550Ah, 600Ah or larger.

[0346] Optionally, the capacity of the battery cell 10 can be obtained by means of charge-discharge testing, battery capacity testing instrument, etc.

[0347] The battery cell 10 provided by the above solution has high charge and discharge performance and reliability. In particular, when the capacity of the battery cell 10 is greater than or equal to 500Ah, it can effectively improve the charging rate of the battery, thereby meeting the charging and discharging requirements of large-capacity batteries.

[0348] According to some embodiments of this application, please refer to Figure 15 , Figure 15 This is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0349] The outer shell 11 is a square outer shell 11. The dimension of the outer shell 11 in the first direction y is W1, the dimension of the outer shell 11 in the second direction x is T1, and the dimension of the outer shell 11 in the third direction z is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction y, the second direction x and the third direction z are perpendicular to each other.

[0350] The first direction y can be the width direction of the battery cell 10, the second direction x can be the thickness direction of the battery cell 10, and the third direction z can be the height direction of the battery cell 10. For example, the third direction z can be the thickness direction of the first wall 112.

[0351] The statement “The size of the outer casing 11 in the first direction y is W1, the size of the outer casing 11 in the second direction x is T1, and the size of the outer casing 11 in the third direction z is H1” can be understood as the width of the outer casing 11 of the battery cell 10 being W1, the thickness being T1, and the height being H1.

[0352] Optionally, the width W1, thickness T1, and height H1 of the outer casing 11 can be measured using a measuring ruler.

[0353] In some embodiments, the width of the outer casing 11 is W1, the thickness is T1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0354] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0355] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0356] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0357] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 2000mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0358] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0359] In some embodiments, the outer casing 11 may be made of steel or stainless steel. In some embodiments, the outer casing 11 is a steel casing, and the thickness of the outer casing 11 may be thinner than that of an aluminum casing, in order to improve the volumetric energy density of the battery cell 10.

[0360] According to some embodiments of this application, some embodiments of this application also provide a battery device 100, which includes a battery cell 10 provided in the first aspect.

[0361] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0362] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0363] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0364] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 20 has a rectangular structure.

[0365] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 10 are arranged inside the housing 20. The multiple battery cells 10 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 10 is housed in the housing 20. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 10 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 20.

[0366] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0367] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100 composed of multiple battery cells 10 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0368] Some embodiments of this application also provide an electrical device, which includes the battery cell 10 provided above and / or the battery device 100 provided above, wherein the battery cell 10 is used to provide electrical energy.

[0369] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 10 and / or battery devices 100. For example, the electrical device can be a vehicle 1000, which can be a range-extended electric vehicle 1000, a pure electric vehicle 1000, or a gasoline-powered vehicle 1000. The electrical energy provided by the battery cells 10 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0370] Some embodiments of this application provide a single battery cell 10; please refer to [link to relevant documentation]. Figures 3-14 .

[0371] The battery cell 10 includes a casing 11, a first electrode terminal 12, a second electrode terminal 17, a first electrode assembly 13, a second electrode assembly 15, a first current collector 14, and a second current collector 18.

[0372] The outer casing 11 is rectangular and includes a shell 110 and a cover 111. The shell 110 includes a side wall and an end wall. One end of the side wall forms an opening, and the other end of the side wall surrounds the end wall. The cover 111 is connected to the side wall to close the opening. The cover 111 is the first wall 112 of the outer casing 11.

[0373] There are two electrode assemblies, including a first electrode assembly 13 and a second electrode assembly 15. The first electrode assembly 13 and the second electrode assembly 15 are stacked, and an insulating film 19 is provided on their outer periphery. The first electrode assembly 13, the second electrode assembly 15, and the insulating film 19 are all disposed inside the housing 11. The first electrode assembly 13 includes a first main body portion 130 and a first tab 131, and the second electrode assembly 15 includes a second main body portion 150 and a third tab 151. The first main body portion 130 and the second main body portion 150 are stacked, and the first tab 131 and the third tab 151 are respectively led out from the same side of the first main body portion 130 and the second main body portion 150.

[0374] Taking the lead-out direction of the electrode tab as the first direction y, the stacking direction of the first main body 130 and the second main body 150 as the second direction x, and the thickness direction of the first wall 112 as the third direction z, the first direction y, the second direction x and the third direction z are perpendicular to each other.

[0375] The first electrode terminal 12 is insulated and mounted on the first wall 112. The first electrode terminal 12 is electrically connected to the first tab 131 and the third tab 151 through the first current collector 14.

[0376] Optionally, a second electrode terminal 17 may also be provided on the first wall 112. The second electrode terminal 17 can be connected to the fourth electrode of the first electrode assembly 13 with the opposite polarity to the first electrode tab 131 through the second current collector 18, and to the fifth electrode of the second electrode assembly 15 with the opposite polarity to the third electrode tab 151.

[0377] The first current collector 14 includes a terminal connection portion 141 and an electrode connection portion 140 connected to each other. Along the third direction z, the terminal connection portion 141 is located between the first main body portion 130 and the first wall 112, and is electrically connected to the first electrode terminal 12. Along the first direction y, the electrode connection portion 140 is located between the side wall and the first main body portion 130, and is electrically connected to the first electrode 131 and the third electrode 151, respectively.

[0378] Please see Figure 4 The first electrode tab 131 and the third electrode tab 151 are arranged at intervals relative to each other along the second direction x. The first electrode tab 131 is turned outward from the side of the first main body portion 130 away from the second main body portion 150 to the side of the electrode tab connecting portion 140 away from the first main body portion 130. The third electrode tab 151 is turned outward from the side of the second main body portion 150 away from the first main body portion 130 to the side of the electrode tab connecting portion 140 away from the second main body portion 150. For example, the first electrode tab 131 includes a bent section 1313 and a first electrode tab portion 1314. The first electrode tab portion 1314 is connected to the first main body portion 130 through the bent section 1313. The first electrode tab portion 1314 is located on the side of the electrode tab connecting portion 140 away from the first main body portion 130, and the first electrode tab portion 1314 is connected to the electrode tab connecting portion 140.

[0379] The electrode connecting portion 140 includes a first portion 142, a second portion 143, and a third portion 144, which are arranged along a second direction x. The second portion 143 connects the first portion 142 and the third portion 144. The first electrode portion 1314 of the first electrode 131 overlaps the first portion 142 on the side opposite to the first main body portion 130, and is welded to the first portion 142. The third electrode portion 1510 of the third electrode 151 overlaps the third portion 144 on the side opposite to the second main body portion 150, and is welded to the third portion 144.

[0380] Along the first direction y, the first portion 142 and the third portion 144 have the same thickness, and the second portion 143 has a greater thickness than the first portion 142 and the third portion 144. Along the first direction y, the second portion protrudes from the first portion 142 toward the side opposite to the first main body portion 130, and the protruding portion is located between the first tab 131 and the third tab 151.

[0381] Please see Figure 12 and Figure 13 The first electrode 131 is composed of multiple first electrode tabs 1311 stacked together. The multiple first electrode tabs 1311 are connected to each other by welding and form a first solder mark.

[0382] Please see Figure 12 and Figure 13 The dimension of the first electrode tab 131 along the third direction z is smaller than the dimension of the first main body portion 130 along the third direction z. The dimension of the electrode tab connecting portion 140 along the third direction z is larger than the dimension of the first electrode tab 131 along the third direction z, that is, the first electrode tab 131 is entirely located on the electrode tab connecting portion 140.

[0383] Please see Figure 12 The angle between the edge of the first electrode 131 facing the third electrode 151 and the edge of the first electrode 131 away from the first wall 112 can be α, and the value of α can be from 95° to 135°.

[0384] The above embodiments provide a battery cell 10, in which a first tab 131 is electrically connected to a first electrode terminal 12 via a first current collector 14 to realize current output and input. The first current collector 14 includes a tab connection portion 140 electrically connected to the first tab 131. The tab connection portion 140 includes a first portion 142 and a second portion 143 arranged along a second direction x. On the one hand, the first portion 142 is located between the first tab 131 and the first body portion 130 and is electrically connected to the first tab 131, so that the first portion 142 can utilize the space between the first tab 131 and the first body portion 130, reducing the space occupied by the first portion 142 inside the battery cell 10 and improving the volumetric energy density of the battery cell 10. On the one hand, by setting the thickness of the second part 143 to be greater than the thickness of the first part 142, and by having the second part 143 protrude from the first surface 1421 of the first part 142, the current carrying capacity of the first current collector 14 can be effectively improved, and the space where the first tab 131 is located can be reasonably utilized. Thus, without affecting the volumetric energy density of the battery cell 10 or with minimal impact on the volumetric energy density of the battery cell 10, the battery cell 10 can have a higher charge and discharge rate, thereby effectively improving the charge and discharge performance of the battery device 100.

[0385] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a first wall; a first electrode terminal disposed on the first wall; a first electrode assembly accommodated in the housing, the first electrode assembly comprising a first body portion and a first tab disposed on one side of the first body portion in a first direction perpendicular to a thickness direction of the first wall; a first current collecting member for electrically connecting the first tab and the first electrode terminal, the first current collecting member comprising a tab connecting portion connected with the first tab; wherein the tab connecting portion comprises a first portion and a second portion arranged in a second direction, the second portion has a thickness greater than that of the first portion in the first direction, the first portion is disposed coplanar with one side of the second portion facing the first body portion in the first direction; the first tab comprises a first tab portion, the first tab portion is located on one side of the first portion away from the first body portion in the first direction, and the first tab portion is connected with the first portion; the projection of the first tab portion and the projection of the second portion at least partially overlap on the same projection plane perpendicular to the second direction, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

2. The battery cell according to claim 1, wherein in a direction of the first body portion pointing to the tab connecting portion, one side of the second portion away from the first body portion does not exceed one side of the first tab away from the first body portion.

3. The battery cell according to claim 1, wherein the first tab portion has a first end away from the first body portion; the second portion is spaced apart from the first end in the second direction.

4. The battery cell according to any one of claims 1-3, wherein the first electrode assembly further comprises a second tab disposed on the first body portion, and the second tab is electrically connected with the tab connecting portion.

5. The battery cell according to claim 4, wherein the first tab and the second tab are both disposed on the same side of the first body portion in the first direction, and the first tab and the second tab do not overlap on the tab connecting portion.

6. The battery cell according to claim 4, wherein the tab connecting portion further comprises a third portion, the second portion is located between the first portion and the third portion in the second direction, and the second portion has a thickness greater than that of the third portion in the first direction; the second tab comprises a second tab portion, the second tab portion is located on one side of the third portion in the first direction, and the second tab portion is connected with the third portion, and the projection of the second tab portion and the projection of the second portion at least partially overlap on the same projection plane perpendicular to the second direction.

7. The battery cell according to any one of claims 1-3, wherein The battery cell further comprises a second electrode assembly, the first electrode assembly and the second electrode assembly are arranged along the second direction; The second electrode assembly comprises a second main body portion and a third tab, the third tab is disposed on one side of the second main body portion along the first direction, and the third tab is electrically connected with the tab connecting portion.

8. The battery cell according to claim 7, wherein On the tab connecting portion, the first tab and the third tab do not overlap.

9. The battery cell according to claim 7, wherein The tab connecting portion further comprises a third portion, along the second direction, the second portion is located between the first portion and the third portion, along the first direction, the thickness of the second portion is greater than the thickness of the third portion; The third tab comprises a third tab portion, the third tab portion is located on one side of the third portion along the first direction, and the third tab portion is connected with the third portion, and the projection of the third tab portion and the projection of the second portion at least partially overlap on the same projection plane perpendicular to the second direction.

10. The battery cell according to claim 9, wherein The thickness of the first portion and the thickness of the third portion are equal.

11. The battery cell according to claim 1, wherein The first tab comprises a plurality of first tab pieces stacked and arranged, and a plurality of the first tab pieces are welded with each other and form a first welding mark portion.

12. The battery cell according to claim 11, wherein The first tab is welded with the tab connecting portion and forms a second welding mark portion.

13. The battery cell according to claim 12, wherein On the same projection plane perpendicular to the first direction, the ratio of the projection area of the second welding mark portion to the projection area of the first tab is greater than or equal to 5% and less than or equal to 30%.

14. The battery cell according to claim 13, wherein On the same projection plane perpendicular to the first direction, the ratio of the projection area of the second welding mark portion to the projection area of the first tab is greater than or equal to 10% and less than or equal to 20%.

15. The battery cell according to claim 12, wherein The second welding mark portion is strip-shaped and extends along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

16. The battery cell according to claim 12, wherein On the same projection plane perpendicular to the first direction, the projection of the second welding mark portion and the projection of the first welding mark portion at least partially overlap.

17. The battery cell according to claim 16, wherein On the same projection plane perpendicular to the first direction, the projection of the first welding mark portion covers the projection of the second welding mark portion, and the ratio of the projection area of the second welding mark portion to the projection area of the first welding mark portion is greater than or equal to 30% and less than or equal to 80%.

18. The battery cell according to claim 17, wherein In the same projection plane perpendicular to the first direction, a ratio of a projected area of the second welding portion to a projected area of the first welding portion is greater than or equal to 50% and less than or equal to 70%. 19.The battery cell of claim 11, wherein, the first tab has a first edge, a second edge, and a third edge, the first edge and the second edge are oppositely arranged along a third direction, the first edge is farther away from the first wall than the second edge, the third edge extends along the third direction and connects the first edge and the second edge, and an angle between the third edge and the first edge is greater than 90° and less than or equal to 140°, the first direction, the second direction, and the third direction are perpendicular to each other. 20.The battery cell of claim 19, wherein, the angle between the third edge and the first edge is greater than or equal to 95° and less than 135°. 21.The battery cell of claim 1, wherein, in a direction along the first wall pointing to the first electrode assembly, a side of the tab connecting portion facing away from the first wall is beyond a side of the first tab facing away from the first wall. 22.The battery cell of claim 1, wherein, in a direction along the first wall pointing to the first electrode assembly, the tab connecting portion has a fourth portion beyond the first tab, and a thickness of the fourth portion is less than or equal to a thickness of the first portion. 23.The battery cell of claim 20, wherein, in a direction along the first wall pointing to the first electrode assembly, a side of the first body portion facing away from the first wall is beyond a side of the tab connecting portion facing away from the first wall. 24.The battery cell of claim 1, wherein, the first electrode assembly further comprises a fourth tab, a polarity of the fourth tab is opposite to a polarity of the first tab, and in the first direction, the fourth tab is arranged on another side of the first body portion; the battery cell further comprises a second electrode terminal and a second current collecting member, the second electrode terminal is arranged on the first wall, the second electrode terminal and the first electrode terminal are arranged along the first direction, and the second current collecting member is configured to electrically connect the fourth tab and the second electrode terminal. 25.The battery cell of claim 1, wherein, a capacity of the battery cell is greater than or equal to 500 Ah. 26.The battery cell of claim 25, wherein, The shell is a square shell, a size of the shell in the first direction is W1, a size of the shell in the second direction is T1, a size of the shell in the third direction is H1, satisfy, 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction, the second direction and the third direction are perpendicular to each other. 27.The battery cell of claim 1, wherein, the housing is a steel housing.

28. A battery device, characterized by The battery cell of any one of claims 1-27.

29. An electrical device, comprising: The battery cell of any one of claims 1-27, or the battery device of claim 28.

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