Battery cell, battery pack, and electric device

Abstract

The application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power utilization device. The application provides a battery monomer, which comprises a shell, a first battery cell and a transition sheet, the shell has a first wall; the first battery cell is arranged in the shell, the first battery cell comprises a first battery cell body and a plurality of first tabs; the transition sheet is arranged between the first wall and the first battery cell body in the thickness direction of the first wall; wherein the first tab comprises a first part and a second part, the second part is located between the transition sheet and the first wall, a plurality of second parts are welded with the transition sheet to form a first welding mark, the first part is connected with the first battery cell body and the second part, the first part has a first end connected with the first battery cell body, the length between the first end and the first welding mark is a, and the following condition is met: 2mm <= a <= 35mm. The application reduces the tearing of the tab.

Description

Technical Field

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

[0002] In related technologies, batteries include cells, and tabs are drawn out from the cells and welded to adapter plates. In order to improve the utilization rate of the battery in the height direction, the tabs are welded to the upper surface of the adapter plates. However, this can cause the tabs to tear easily, affecting the overcurrent capacity of the tabs, resulting in excessive heat generation during battery charging and discharging, which can easily cause safety risks such as thermal runaway. Utility Model Content

[0003] This application provides a battery cell, a battery pack, and an electrical device that reduces tab tearing.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, a first cell, and an adapter plate. The housing has a first wall; the first cell is disposed within the housing, and the first cell includes a first cell body and a plurality of first tabs; along the thickness direction of the first wall, the adapter plate is disposed between the first wall and the first cell body; wherein, the first tab includes a first part and a second part, the second part is located between the adapter plate and the first wall, the plurality of second parts are welded to the adapter plate to form a first solder mark, the first part connects the first cell body and the second part, the first part has a first end connected to the first cell body, and the length between the first end and the first solder mark is a, satisfying: 2mm≤a≤35mm.

[0006] The battery cell proposed in this application has multiple first tabs extending from the first cell body and flipped to the space between the first wall and the adapter plate. Multiple second parts are welded to the adapter plate to form a first solder mark. The first tab between the first end and the first solder mark is subjected to tension from the first cell body and the first solder mark. If the length of the first tab between the first end and the first solder mark is too short, the tension on the first tab is too high, making it prone to tearing and affecting current flow. If the length of the first tab between the first end and the first solder mark is too long, the length is redundant, and the first tab is prone to overlapping with the casing, potentially causing a short circuit. Furthermore, an excessively long first tab also affects the assembly efficiency of the first cell during assembly with the casing. Therefore, controlling the length of the first tab between the first end and the first solder mark can reduce tearing and redundancy of the first tab and improve the assembly efficiency of the first cell with the casing.

[0007] Secondly, embodiments of this application also provide a battery pack, including the battery cells described in any of the above embodiments.

[0008] The battery pack in this application includes a battery cell with multiple first tabs extending from the first cell body and flipped to the space between the first wall and the adapter plate, and multiple second parts welded to the adapter plate to form a first solder mark. The length of the first tab between the first end and the first solder mark is controlled. By controlling the length of the first tab between the first end and the first solder mark, the tearing and redundancy of the first tab are reduced, and the assembly efficiency of the first cell and the casing can be improved.

[0009] Thirdly, embodiments of this application also provide an electrical device, including a single battery cell or a battery pack as described in any of the above embodiments.

[0010] The electrical equipment in this application includes the battery cell and battery pack described in any of the above embodiments, and therefore possesses the beneficial effects of the battery cell and battery pack described in any of the above embodiments. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a single battery cell in this application;

[0013] Figure 2 This is a schematic diagram of the structure of a single battery cell in this application;

[0014] Figure 3 This is a partial structural diagram of a single battery cell in this application.

[0015] [Explanation of Labels in the Attached Image]

[0016] 1: Shell; 11: First wall; 12: Second wall;

[0017] 2: First battery cell; 21: First battery cell body; 22: First electrode; 221: First part; 2211: First terminal; 222: Second part; 223: Third part;

[0018] 3: Adapter plate;

[0019] 41: First solder mark; 42: Second solder mark;

[0020] 5: Electrode terminals;

[0021] 6: Strengthening the Department;

[0022] 7: Second battery cell; 71: Second battery cell body; 72: Second electrode;

[0023] A: The thickness direction of the first wall; B: The second direction; C: The third direction. Detailed Implementation

[0024] 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 and completely 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.

[0025] 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.

[0026] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0027] 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.

[0028] 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.

[0029] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0030] A battery cell is the smallest charging and discharging unit. A battery cell consists of a positive electrode, a negative electrode, and a separator between them, formed by winding or stacking. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, conductive agent, and binder. The main positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. The negative electrode includes a negative current collector and a negative active material. The negative current collector can be made of metals such as copper foil, aluminum foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The negative active material includes the main negative active material, conductive agent, and binder. The main negative active material includes one or more of the main negative active materials such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate. The tab serves as the current output terminal of the battery cell, and it can be integrated with or separately connected to the positive or negative electrode. The post is the current output terminal of the battery. The adapter plate and the tab, or the adapter plate and the post, can be electrically connected by welding, which includes ultrasonic welding, resistance welding, and laser welding.

[0031] A battery consists of cells, with tabs extending from the cells and welded to adapter plates. To improve the utilization rate of the battery's height, the tabs are welded to the surface of the adapter plate away from the cells. The base of the tab connected to the cell and the welded area with the adapter plate are subjected to tensile forces from both the cell and the solder joint, making the tabs prone to tearing. Increasing the length of the tab between the base of the tab connected to the cell and the welded area with the adapter plate can easily cause the tab to overlap with the casing, resulting in a short circuit. Therefore, it is necessary to control the length of the tabs between the cells and the adapter plate to reduce overlap with the casing while also reducing tearing.

[0032] Firstly, reference Figure 1 and Figure 2This application provides a battery cell comprising a housing 1, a first cell 2, and an adapter plate 3. The housing 1 has a first wall 11. The first cell 2 is disposed within the housing 1 and includes a first cell body 21 and a plurality of first tabs 22. Along the thickness direction A of the first wall 11, the adapter plate 3 is disposed between the first wall 11 and the first cell body 21. The first tabs 22 include a first part 221 and a second part 222. The second part 222 is located between the adapter plate 3 and the first wall 11. The plurality of second parts 222 are welded to the adapter plate 3 to form a first solder mark 41. The first part 221 connects the first cell body 21 and the second part 222. The first part 221 has a first end 2211 connected to the first cell body 21. The length of the first tab between the first end 2211 and the first solder mark 41 is a, satisfying: 2mm≤a≤35mm.

[0033] The housing 1 has a receiving cavity, and the first battery cell 2 is disposed in the receiving cavity of the housing 1. Multiple first tabs 22 extend from the first battery cell body 21, and the second part 222 of each first tab 22 is welded to the adapter plate 3 to form a first solder mark 41. The second part 222 is welded on the side of the adapter plate 3 facing the first wall 11, which reduces the space occupied by the multiple first tabs 22 between the adapter plate 3 and the first battery cell body 21, thereby improving the space utilization of the battery cell. The first wall 11 is provided with electrode terminals 5, and the adapter plate 3 is welded to the electrode terminals 5 to conduct electricity between the first tabs 22 and the electrode terminals 5.

[0034] The length between the first end 2211 and the first solder mark 41 can be understood as: when the first electrode tab 22 is in a fully extended state, along the extension direction of the length of the first electrode tab 22, the size of the part of the first electrode tab 22 between the first end 2211 and the first solder mark 41, which is the length of the first part 221.

[0035] The length 'a' of the first tab 22 between the first end 2211 and the first solder mark 41 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 15mm, 17mm, 19mm, 20mm, 22mm, 24mm, 25mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, or 35mm, etc.

[0036] The battery cell proposed in this application embodiment extends multiple first tabs 22 from the first cell body 21 and flips them to the space between the first wall 11 and the adapter plate 3. Multiple second parts 222 are welded to the adapter plate 3 to form a first solder mark 41. The first tab 22 between the first end 2211 and the first solder mark 41 is subjected to the tension of the first cell body 21 and the first solder mark 41. If the length of the first tab 22 between the first end 2211 and the first solder mark 41 is too small, the tension borne by the first tab 22 between the first end 2211 and the first solder mark 41 is too large, and the first tab 22 is easy to tear, affecting the current carrying capacity of the first tab 22. If the length of the first tab 22 between the first end 2211 and the first solder mark 41 is too long, the length of the first tab 22 between the first end 2211 and the first solder mark 41 is redundant, and the first tab 22 is easy to overlap with the shell 1, thereby causing a short circuit. Furthermore, when assembling the first cell 2 and the shell 1, the excessively long first tab 22 will also affect the assembly efficiency of the first cell 2. Therefore, controlling the length of the first tab 22 between the first end 2211 and the first solder mark 41 can reduce the tearing and redundancy of the first tab 22 and improve the assembly efficiency of the first cell 2 and the housing 1.

[0037] The multiple first tabs 22 in this application include first sub-tabs and second sub-tabs. The first and second sub-tabs extend from the first cell body 21 and are welded to the adapter plate 3. The first sub-tab overlaps the surface of the adapter plate 3 facing the first wall 11. The second sub-tab is farther from the adapter plate 3 than the first sub-tab. Inside the housing 1, the second sub-tab is closer to the housing 1 than the first sub-tab, making it easier to contact the housing 1. Therefore, it is necessary to control the maximum length of the second sub-tab to reduce redundancy and the risk of overlap between the second sub-tab and the housing 1. The first sub-tab extends from the first cell body 21 and overlaps the adapter plate 3 after bending. Because the first sub-tab has a relatively long length from the first cell body 21 to the adapter plate 3, it is prone to tension and tearing due to the high tensile force. Therefore, the minimum length of the first sub-tab should be controlled to reduce tearing.

[0038] Optionally, refer to Figure 3 The first electrode 22 has multiple reinforcing parts 6 for improving the structural strength of the first electrode 22, satisfying: 2mm≤a≤33mm.

[0039] The first tab 22 has a reinforcing portion 6 to improve the structural strength of the first tab 22, thereby reducing tearing of the first tab 22. Because the strength of the first tab 22 is enhanced, it is less prone to tearing, and the length of the first tab 22 between the first end 2211 and the first solder mark 41 can be reduced.

[0040] The length 'a' of the first tab 22 between the first end 2211 and the first solder mark 41 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 15mm, 17mm, 19mm, 20mm, 22mm, 24mm, 25mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, or 33mm, etc.

[0041] Optionally, the reinforcing part 6 is constructed as a raised structure or a recessed structure, and the shape of the raised structure or the recessed structure is elongated, circular or elliptical.

[0042] The raised and recessed structures can be embossed structures formed on the first electrode lug 22 by stamping or other methods. They can be long strip-shaped reinforcing ribs, or circular or elliptical embossed structures. Of course, the reinforcing part 6 can also be other uneven textures formed on the first electrode lug 22 by stamping or other methods. The structural form of the reinforcing part 6 can be selected according to the actual situation.

[0043] Optionally, refer to Figure 3 Multiple first tabs 22 are welded together to form a second solder mark 42. A portion of the second solder mark 42 is welded to the adapter piece 3 to form a first solder mark 41. Along the thickness direction A of the first wall 11, the projection of the first solder mark 41 falls into the projection of the second solder mark 42.

[0044] Multiple first tabs 22 are pre-welded together to form a second weld mark 42. The second part 222 with the second weld mark 42 is welded to the adapter piece 3 to form a first weld mark 41. Along the thickness direction A of the first wall 11, the projection of the first weld mark 41 falls within the projection of the second weld mark 42. That is, the area of ​​the first weld mark 41 is larger than the area of ​​the second weld mark 42, and the first weld mark 41 is located within the area of ​​the second weld mark 42. Since the first tab 22 between the first weld mark 41 and the first end 2211 is subjected to a large tensile force from the first weld mark 41, the first tab 22 is prone to tearing at the edge of the first weld mark 41. Therefore, before welding the second part 222 and the adapter piece 3, multiple first tabs 22 are pre-welded to form a second weld mark 42 to enhance the strength of the first tab 22, thereby reducing the tearing of the first tab 22 between the first weld mark 41 and the first end 2211 caused by the tension of the first weld mark 41.

[0045] Optionally, refer to Figure 2 and Figure 3 Along the extension direction of the first tab 22, the size of the first solder mark 41 is c, which satisfies: 2mm≤c≤10mm.

[0046] The direction of the first tab 22 can be understood as the length direction of the first tab 22 after it is fully unfolded and flattened. The size of the first solder mark 41 cannot be too large. If the size of the first solder mark 41 is too large, the length of the first tab 22 between the first solder mark 41 and the first end 2211 will be too small, and the first tab 22 will easily become taut, which may lead to the first tab 22 tearing. If the size of the first solder mark 41 is too small, the connection strength between the first tab 22 and the adapter piece 3 will be insufficient, and the current carrying capacity between the first tab 22 and the adapter piece 3 will be insufficient.

[0047] Wherein, along the extension direction of the first tab 22, the size c of the first solder mark 41 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm or 10mm, etc.

[0048] Optionally, refer to Figure 2 and Figure 3 The first electrode 22 also includes a third part 223, which is connected to the end of the second part 222 away from the first part 221.

[0049] The third part 223 is set at the end of the second part 222 away from the first part 221 so that each first electrode 22 has sufficient length to be welded to the adapter piece 3, thereby reducing the problem of insufficient current carrying capacity caused by insufficient welding length between the first electrode 22 and the adapter piece 3.

[0050] Optionally, refer to Figure 2 and Figure 3 Along the extension direction of the first tab 22, the dimension of the third part 223 is d, which satisfies: 0.5mm≤d≤17mm.

[0051] If the size of the third part 223 is too large, the length of the first tab 22 between the first solder mark 41 and the first end 2211 will be too small, and the first tab 22 between the first solder mark 41 and the first end 2211 will easily become tight, which may lead to tearing of the first tab 22 between the first solder mark 41 and the first end 2211. Furthermore, if the size of the third part 223 is too large, the third part 223 will extend between the electrode terminal 5 and the adapter piece 3, resulting in a poor solder joint between the electrode terminal 5 and the adapter piece 3. If the size of the third part 223 is too small, the length of the first tab 22 between the first solder mark 41 and the first end 2211 will be too large, resulting in redundancy of the first tab 22 between the first solder mark 41 and the first end 2211. The first tab 22 between the first solder mark 41 and the first end 2211 may easily come into contact with the housing 1, thereby increasing the risk of short circuit.

[0052] Wherein, along the extending direction of the first electrode tab 22, the dimension d of the third part 223 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 16mm or 17mm, etc.

[0053] Optionally, refer to Figure 1 The housing 1 includes two second walls 12 and two third walls (not shown). The area of ​​the outer surface of the second wall 12 is larger than the area of ​​the outer surface of the third wall. The two second walls 12 are arranged opposite each other along the second direction B, and the two third walls are arranged opposite each other along the third direction C. The battery cell also includes a second cell 7, which is disposed inside the housing 1. The second cell 7 includes a second cell body 71 and a plurality of second tabs 72. The second cell body 71 and the first cell body 21 are stacked along the second direction B. Along the second direction B, the second tabs 72 and the first tabs 22 are respectively connected to the opposite sides of the adapter piece 3, satisfying: 2mm≤a≤32mm.

[0054] Two second walls 12 and two third walls are connected to the first wall 11. The two second walls 12 are large-area side walls of the housing 1, and the two third walls are small-area side walls of the housing 1. The second direction B is the relative setting direction of the two second walls 12, and the third direction is the relative setting direction of the two third walls. The first cell body 21 and the second cell body 71 are stacked along the second direction B. The first electrode 22 extending from the first cell body 21 is connected to one side of the adapter plate 3, and the second electrode 72 extending from the second cell body 71 is connected to the other side of the adapter plate 3. Since the first electrode 22 and the second electrode 72 are connected at the edges of opposite sides of the adapter plate 3, the first electrode 22 and the second electrode 72... The gap between the first electrode 22 and the housing 1 is small. If the length of the first electrode 22 and the second electrode 72 in the conventional process is used, the length of the first electrode 22 and the second electrode 72 will be relatively long. The first electrode 22 and the second electrode 72 are easy to overlap with the housing 1, which will cause a short circuit. In order to reduce the overlap between the first electrode 22 and the second electrode 72 and the housing 1, it is necessary to limit the size of the first electrode 22 between the first end 2211 and the first solder mark 41. While reducing the overlap between the first electrode 22 and the housing 1, it can also improve the housing insertion efficiency of the first battery cell 2. Since the structure of the second battery cell 7 is the same as that of the first battery cell 2, the size of the second electrode 72 also needs to be controlled to be the same as or similar to the size of the first electrode 22.

[0055] The length 'a' of the first tab 22 between the first end 2211 and the first solder mark 41 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 15mm, 17mm, 19mm, 20mm, 22mm, 24mm, 25mm, 27mm, 28mm, 29mm, 30mm, 31mm, or 32mm, etc.

[0056] Optionally, refer to Figure 2 Along the thickness direction A of the first wall 11, the distance between the first cell body 21 and the side of the adapter piece 3 away from the first cell body 21 is e, which satisfies: 0.2mm≤e≤7mm.

[0057] Along the thickness direction A of the first wall 11, if the distance e between the first cell body 21 and the side of the adapter 3 away from the first cell body 21 is too large, the first tab 22 is easily stretched, and the first tab 22 is subjected to a large pulling force from the first cell body 21 and the first solder mark 41, which leads to the tearing of the first tab 22; if the distance e between the first cell body 21 and the side of the adapter 3 away from the first cell body 21 is too small, the first tab 22 is redundant, and the first tab 22 accumulates in the housing 1, which easily contacts the housing 1, leading to a short circuit.

[0058] Wherein, along the thickness direction A of the first wall 11, the distance e between the first cell body 21 and the side of the adapter piece 3 away from the first cell body 21 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.1mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.7mm, 4mm, 4.2mm, 4.4mm, 4.5mm, 4.6mm, 4.8mm, 5mm, 5.3mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.7mm or 7mm.

[0059] Secondly, embodiments of this application also provide a battery pack, including the battery cells described in any of the above embodiments.

[0060] The battery pack in this application includes a battery cell. Each battery cell has multiple first tabs 22 extending from the first cell body 21 and flipped to the space between the first wall 11 and the adapter plate 3. Multiple second parts 222 are welded to the adapter plate 3 to form a first solder mark 41. The length of the first tab 22 between the first end 2211 and the first solder mark 41 is controlled. If the length of the first tab 22 between the first end 2211 and the first solder mark 41 is too small, the first tab 22 between the first end 2211 and the first solder mark 41 will bear a large tensile force, and the first tab 22 will be easy to tear, affecting the current carrying capacity of the first tab 22. If the length of the first tab 22 between the first end 2211 and the first solder mark 41 is too long, the length of the first tab 22 between the first end 2211 and the first solder mark 41 will be redundant, and the first tab 22 will be easy to overlap with the casing 1, thereby causing a short circuit. In addition, when the first cell 2 is assembled with the casing 1, the excessively long first tab 22 will also affect the assembly efficiency of the first cell 2. Therefore, by controlling the length of the first tab 22 between the first end 2211 and the first solder mark 41, the tearing and redundancy of the first tab 22 can be reduced, and the assembly efficiency of the first cell 2 and the housing 1 can be improved.

[0061] Thirdly, embodiments of this application also provide an electrical device, including a single battery cell or a battery pack as described in any of the above embodiments.

[0062] The electrical equipment in this application includes the battery cell and battery pack described in any of the above embodiments, and therefore possesses the beneficial effects of the battery cell and battery pack described in any of the above embodiments.

[0063] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0065] The above description is merely an embodiment of this application and is not intended to limit the scope of 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 scope of the claims of this application.

[0066] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The shell has a first wall; A first battery cell is disposed within the housing, and the first battery cell includes a first battery cell body and a plurality of first tabs; An adapter piece is disposed between the first wall and the first cell body along the thickness direction of the first wall. The first electrode includes a first part and a second part. The second part is located between the adapter piece and the first wall. Multiple second parts are welded to the adapter piece to form a first solder mark. The first part connects the first cell body and the second part. The first part has a first end connected to the first cell body. The length between the first end and the first solder mark is a, which satisfies: 2mm≤a≤35mm.

2. The battery cell according to claim 1, characterized in that, The first electrode has multiple reinforcing parts for improving the structural strength of the first electrode, satisfying: 2mm≤a≤33mm.

3. The battery cell according to claim 2, characterized in that, The reinforcing part is constructed as a raised structure or a recessed structure, and the shape of the raised structure or the recessed structure is elongated, circular or elliptical.

4. The battery cell according to claim 1, characterized in that, Multiple first tabs are welded to each other to form a second solder mark, a portion of the second solder mark is welded to the adapter piece to form the first solder mark, and the projection of the first solder mark falls within the projection of the second solder mark along the thickness direction of the first wall.

5. The battery cell according to claim 1, characterized in that, Along the extension direction of the first electrode tab, the size of the first solder mark is c, which satisfies: 2mm≤c≤10mm.

6. The battery cell according to claim 1, characterized in that, The first electrode also includes a third part, which is connected to the end of the second part away from the first part.

7. The battery cell according to claim 6, characterized in that, Along the extension direction of the first tab, the dimension of the third part is d, which satisfies: 0.5mm≤d≤17mm.

8. The battery cell according to claim 1, characterized in that, The housing includes two second walls and two third walls. The area of ​​the outer surface of the second wall is larger than the area of ​​the outer surface of the third wall. The two second walls are arranged opposite each other along a second direction, and the two third walls are arranged opposite each other along a third direction. The battery cell also includes a second cell disposed within the housing. The second cell includes a second cell body and a plurality of second tabs. The second cell body and the first cell body are stacked along the second direction. Along the second direction, the second tabs and the first tabs are respectively connected to opposite sides of the adapter piece, satisfying: 2mm≤a≤32mm.

9. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the distance between the first cell body and the side of the adapter piece away from the first cell body is e, which satisfies: 0.2mm≤e≤7mm.

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1-9.

11. An electrical appliance, characterized in that, Includes the battery cell of any one of claims 1-9 or the battery pack of claim 10.

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