Battery monomer, battery and electric device
By optimizing the design of the electrode and increasing its width at one end close to the main body, the problem of insufficient overcurrent capability of the electrode is solved and more efficient current transmission is achieved.
Patent Information
- Application Number
- CN202421217828.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the prior art, the overcurrent capability of the extreme ear is insufficient, mainly due to the small width of the extreme ear, which leads to poor overcurrent capability when connecting the cover plate and the extreme column.
By optimizing the design of the pole ear, it is ensured that the first side width of the pole ear is greater than the second side width, and that the second side is located between the first welding area and the balance valve, avoiding overlapping therewith, thereby increasing the width of the pole ear close to the main body portion and improving overflow capability.
Without affecting the installation of the balance valve and pole column, the width of the pole ear is increased, thereby significantly improving the overcurrent capability of the pole ear and enhancing the overall performance of the battery.
Smart Images
Figure CN222690861U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art
[0002] As an important connecting and conductive part between the main body and the cover of the battery cell, the current carrying capacity of the tab is very important. In the related art, the welding area on the explosion-proof valve and the adapter will occupy the space on the cover, resulting in a reduction in the width of the space reserved for the tab, and reducing the current carrying capacity of the tab. Therefore, how to improve the current carrying capacity of the tab is a technical problem that needs to be solved in the field of battery technology.
[0003] The current capacity of the tab is limited by factors such as the tab width, tab thickness, number of tab layers, and current coefficient. When the tab thickness, number of tab layers, and current coefficient are constant, increasing the tab width can improve the current capacity of the tab, and the tab width is affected by the width of the entire cover plate, the arrangement of the pole column, the balancing valve, etc. In the related art, the tab is roughly rectangular and located between the balancing valve and the pole column. The width of the tab is small, resulting in poor current capacity of the tab. Utility Model Content
[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery and an electrical device, aiming to improve the current carrying capacity of the tab.
[0005] This application is implemented through the following technical solutions.
[0006] In a first aspect, the present application provides a battery cell, comprising:
[0007] Cover plate;
[0008] A balancing valve, arranged on the cover plate;
[0009] Two poles are provided on the cover plate and spaced apart along a first direction, and the balancing valve is located between the two poles;
[0010] At least two adapter plates, each of which is welded to the corresponding pole to form a first welding area;
[0011] At least one bare battery cell, the bare battery cell comprising a main body and two tabs, each tab being electrically connected to the corresponding pole via the adapter; the tab comprising a first side edge close to one side of the main body and a second side edge away from the main body;
[0012] In the projection of the plane where the cover plate is located, the pole lug, the first welding area and the balancing valve do not overlap each other;
[0013] The second side edge is located between the first welding area and the balancing valve, and a width of the second side edge along the first direction is smaller than a width of the first side edge along the first direction.
[0014] In the battery cell provided in the embodiment of the present application, under the premise that the pole ear, the first welding area and the balancing valve do not overlap with each other, in the comparative embodiment in which the width of the second side is the same as that of the pole ear in the related art, the embodiment of the present application is equivalent to increasing the width of the first side, which is beneficial to increase the width of one end of the pole ear close to the main body and improve the current carrying capacity of the pole ear.
[0015] In some embodiments, a width of the second side along the first direction is smaller than a minimum distance between the balancing valve and the first welding area.
[0016] In this way, the second side edge of the pole ear will not cover the balancing valve and the first welding area, and thus will not affect the installation of the balancing valve and the pole.
[0017] In some embodiments, the width of the first side along the first direction is 1.2 to 2 times the width of the second side along the first direction.
[0018] In this embodiment, the width ratio of the first side edge and the second side edge is moderate, so that the cutting size of the tab is reduced.
[0019] In some embodiments, a width of the first side along the first direction is greater than a minimum distance between the balancing valve and the first welding area.
[0020] In this way, the width of the tab can be increased without affecting the balancing valve and the first welding area, thereby improving the flow capacity.
[0021] In some embodiments, a width of the first side along the first direction is 1.1 to 1.6 times a minimum distance between the balancing valve and the first welding area.
[0022] In this embodiment, the width of the pole ear is increased, thereby improving the current carrying capacity.
[0023] In some embodiments, the first welding area is circular.
[0024] In some embodiments, the pole ear has a third side on two opposite sides along the first direction, and the third side connects the first side and the second side, wherein the third side includes a first outer rounded corner segment, a second outer rounded corner segment and a connecting segment, the first outer rounded corner segment is connected to the first side, the second outer rounded corner segment is connected to the second side, and the connecting segment connects the first outer rounded corner segment and the second outer rounded corner segment.
[0025] The rounded corner design of the third side of this embodiment enables both ends of the third side to transition into arcs, thus avoiding sharp corners.
[0026] In some embodiments, the connecting segment is a straight line segment, or the connecting segment is a concave arc segment.
[0027] The connection section is an important part of the third side. The connection of the straight section is simple and direct, which is conducive to ensuring a uniform width transition of the pole ear. The concave arc section is adapted to the arc edge of the first welding area, which is conducive to avoiding the first welding area or the balancing valve.
[0028] In some embodiments, the tab is welded to the adapter and a second welding region is formed in a middle region of the tab.
[0029] The second welding area is located in the middle area of the pole ear, which is conducive to stabilizing the pole ear, thereby ensuring that the charging and discharging current continues to flow smoothly between the pole ear and the adapter.
[0030] In some embodiments, the second welding area is rectangular.
[0031] The rectangular welding area can provide a larger contact area and increase the firmness of the welding connection.
[0032] In some embodiments, the number of the bare cells is multiple, and the multiple bare cells are stacked along the second direction, wherein the pole ears of a portion of the bare cells extend from the first side of the cover plate along the second direction to the second side, and the pole ears of another portion of the bare cells extend from the second side of the cover plate along the second direction to the first side, wherein the first direction is perpendicular to the second direction.
[0033] With this arrangement, more bare cells can be stacked within a limited space, and the mass energy density is increased.
[0034] A second aspect of the present application provides a battery, comprising the battery cell described in any embodiment of the present application.
[0035] A third aspect of the present application provides an electrical device, comprising the battery described in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
[0037] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;
[0038] Figure 2 A schematic diagram of a portion of the structure of a battery cell provided in one embodiment of the present application;
[0039] Figure 3 A schematic diagram of a partial structure of a battery cell provided in another embodiment of the present application.
[0040] Description of Reference Numerals
[0041] 110, cover plate; 110a, first side; 110b, second side; 120, balancing valve; 130, adapter; 130a, first welding area; 130b, second welding area; 140, bare cell; 141, main body; 142, pole ear; 1421, first side; 1422 second side; 1423, third side; 1423a, first outer rounded corner section; 1423b, second outer rounded corner section; 1423c, connecting section. DETAILED DESCRIPTION
[0042] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.
[0044] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.
[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0047] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.
[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.
[0050] Below, this application is described in detail.
[0051] As an important connecting and conductive part between the main body and the cover of the battery cell, the current carrying capacity of the tab is very important. In the related art, the welding area on the explosion-proof valve and the adapter will occupy the space on the cover, resulting in a reduction in the width of the space reserved for the tab, and reducing the current carrying capacity of the tab. Therefore, how to improve the current carrying capacity of the tab is a technical problem that needs to be solved in the field of battery technology.
[0052] The current capacity of the tab is limited by factors such as the tab width, tab thickness, number of tab layers, and current coefficient. When the tab thickness, number of tab layers, and current coefficient are constant, increasing the tab width can improve the current capacity of the tab, and the tab width is affected by the width of the entire cover plate, the arrangement of the pole column, the balancing valve, etc. In the related art, the tab is roughly rectangular and located between the balancing valve and the pole column. The width of the tab is small, resulting in poor current capacity of the tab.
[0053] In view of the above problems, an embodiment of the present application provides a battery cell, including a cover plate, a balancing valve, two poles, at least two adapters and at least one bare cell. The balancing valve is arranged on the cover plate. The two poles are arranged on the cover plate and are spaced apart along the first direction, and the balancing valve is located between the two poles. Each adapter is welded to the corresponding pole and forms a first welding area. The bare cell includes a main body and two pole ears, and each pole ear is electrically connected to the corresponding pole through the adapter. The pole ear includes a first side edge close to one side of the main body and a second side edge away from the main body. In the projection of the plane where the cover plate is located, the pole ear, the first welding area and the balancing valve do not overlap each other. The second side edge is located between the first welding area and the balancing valve, and the width of the second side edge along the first direction is less than the width of the first side edge along the first direction.
[0054] In the battery cell provided in the embodiment of the present application, under the premise that the pole ear, the first welding area and the balancing valve do not overlap with each other, in the comparative embodiment in which the width of the second side is the same as that of the pole ear in the related art, the embodiment of the present application is equivalent to increasing the width of the first side, which is beneficial to increase the width of one end of the pole ear close to the main body and improve the current carrying capacity of the pole ear.
[0055] An embodiment of the present application provides a battery, comprising the battery cell described in any embodiment of the present application.
[0056] An embodiment of the present application provides an electrical device, comprising the battery described in any embodiment of the present application.
[0057] The battery provided in the embodiment of the present application can be used in, but not limited to, an electric device. The electric device can be, but not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.
[0058] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.
[0059] Figure 1The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.
[0060] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
[0061] See also Figure 2 or Figure 3 , an embodiment of the present application provides a battery cell, including a cover plate 110, a balancing valve 120, two poles, at least two adapters 130 and at least one bare cell 140. The balancing valve 120 is disposed on the cover plate 110. The two poles are disposed on the cover plate 110 and are arranged at intervals along the first direction, and the balancing valve 120 is located between the two poles. Each adapter 130 is welded to the corresponding pole and forms a first welding area 130a. The bare cell 140 includes a main body 141 and two pole ears 142, and each pole ear 142 is electrically connected to the corresponding pole through the adapter 130. The pole ear 142 includes a first side 1421 close to one side of the main body 141 and a second side 1422 away from the main body 141. In the projection of the plane where the cover plate 110 is located, the pole ear 142, the first welding area 130a and the balancing valve 120 do not overlap each other. The second side edge 1422 is located between the first welding area 130 a and the balancing valve 120 , and a width of the second side edge 1422 along the first direction is smaller than a width of the first side edge 1421 along the first direction.
[0062] The battery cell may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged. The battery cell may also be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.
[0063] The bare cell 140 includes a main body 141 and tabs 142, wherein the tabs 142 are divided into positive tabs 142 and negative tabs 142. The main body 141 is the main part of the bare cell 140, i.e., the core component where the electrochemical reaction occurs. The tabs 142 are metal conductors that lead the positive and negative electrodes out of the bare cell 140.
[0064] The cover plate 110 is an important part of the battery cell package, and its main function is to protect the bare battery cell 140 .
[0065] The balancing valve 120 is a safety component of the battery cell, and is used to balance the internal and external air pressures of the battery cell. The balancing valve 120 of the embodiment of the present application may be an explosion-proof valve, an exhaust valve, or the like.
[0066] The pole is an important part of the battery cell. It is a structure that electrically connects the battery cell to other external structures (such as the busbar). Its shape, size, model, etc. need to be designed and manufactured according to different battery types, current requirements, and environmental adaptability. It should be noted that for the same battery cell, one of the two poles is the positive pole and the other is the negative pole.
[0067] The adapter 130 is a structural component inside the battery cell, and is used to electrically connect the pole and the tab 142, that is, a conductive path is established between the pole and the tab 142 through the adapter 130. It should be noted that one adapter 130 connects the positive tab 142 and the positive pole, and the other adapter 130 connects the negative tab 142 and the negative pole.
[0068] The first welding area 130 a refers to an area on the adapter plate 130 that is welded to the pole. As an example, the area may be a laser welding area, an ultrasonic welding area, or the like.
[0069] The first side edge 1421 and the second side edge 1422 are both sides of the tab 142 on opposite sides along the extension direction of the tab 142. The first side edge 1421 is close to the main body 141, and the second side edge 1422 is far from the main body 141. Figure 2 or Figure 3 The tab 142 extends along the second direction, and the first side edge 1421 and the second side edge 1422 are respectively located at two opposite sides of the tab 142 along the second direction.
[0070] In the battery cell provided in the embodiment of the present application, the width of the cover plate 110, the arrangement of the pole and the balancing valve 120 are fixed, so the maximum value of the width of the second side 1422 located between the first welding area 130a and the balancing valve 120 is a constant value, and the width of the first side 1421 close to the main body 141 is greater than the second side 1422, thereby increasing the width of the pole ear 142 and improving the current flow capacity of the pole ear 142.
[0071] In some embodiments, see Figure 2 or Figure 3 , the width h2 of the second side edge 1422 along the first direction is less than the minimum distance d1 between the balancing valve 120 and the first welding area 130a. That is, h2 <d1。
[0072] The distance between any point on the edge line of the balancing valve 120 and any point on the edge line of the first welding area 130a, the distance between the two points with the smallest value is the minimum distance between the balancing valve 120 and the first welding area 130a, that is, Figure 2 or Figure 3 d1 shown in .
[0073] In this way, the second side edge 1422 of the pole lug 142 will not cover the balancing valve 120 and the first welding area 130 a , thereby not affecting the installation of the balancing valve 120 and the pole.
[0074] In some embodiments, the width h1 of the first side 1421 along the first direction is 1.2 to 2 times the width h2 of the second side 1422 along the first direction. That is, h1 = h2*(1.2 to 2). For example, it can be 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, etc.
[0075] In this embodiment, the width ratio of the first side 1421 and the second side 1422 is moderate, so that the cutting size of the tab 142 is reduced.
[0076] In some embodiments, the width h1 of the first side 1421 along the first direction is greater than the minimum distance d1 between the balancing valve 120 and the first welding area 130a, that is, h1>d1.
[0077] The distance between any point on the edge line of the balancing valve 120 and any point on the edge line of the first welding area 130a, the distance between the two points with the smallest value is the minimum distance between the balancing valve 120 and the first welding area 130a, that is, Figure 2 or Figure 3 d1 shown in .
[0078] In this way, the width of the tab 142 can be increased without affecting the balancing valve 120 and the first welding area 130 a, thereby improving the flow capacity.
[0079] In some embodiments, the width h1 of the first side 1421 along the first direction is 1.1 to 1.6 times the minimum distance d1 between the balancing valve 120 and the first welding area 130a. That is, h1 = d1*(1.1 to 1.6). For example, it can be 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, etc.
[0080] The minimum distance between the balancing valve 120 and the first welding area 130a is a fixed value, and the width of the first side edge 1421 along the first direction is 1.1 to 1.6 times of the fixed value. In this embodiment, the width of the tab 142 is increased, thereby improving the flow capacity.
[0081] In some embodiments, see Figure 2 or Figure 3 , the first welding area 130a is circular.
[0082] In some embodiments, the pole ear 142 has a third side 1423 on two opposite sides along the first direction, and the third side 1423 connects the first side 1421 and the second side 1422, wherein the third side 1423 includes a first outer rounded corner segment 1423a, a second outer rounded corner segment 1423b and a connecting segment 1423c, the first outer rounded corner segment 1423a is connected to the first side 1421, the second outer rounded corner segment 1423b is connected to the second side 1422, and the connecting segment 1423c connects the first outer rounded corner segment 1423a and the second outer rounded corner segment 1423b.
[0083] The third side edges 1423 refer to the side edges of the tab 142 at two opposite sides along the first direction, and are used to connect the first side edge 1421 and the second side edge 1422. In addition, each tab 142 has two third side edges 1423.
[0084] The outer rounded corner refers to an arc segment protruding outward, and is a part of the third side 1423 .
[0085] The connecting section 1423c is a portion of the third side 1423 and is used to connect the first outer rounded corner section 1423a and the second outer rounded corner section 1423b.
[0086] The rounded corner design of the third side 1423 of this embodiment enables both ends of the third side 1423 to transition into arcs, thus avoiding sharp corners.
[0087] In some embodiments, the connecting segment 1423c is a straight line segment, or the connecting segment 1423c is a concave arc segment.
[0088] The straight line segment refers to the straight line connecting the first outer rounded corner segment 1423 a and the second outer rounded corner segment 1423 b. The concave arc segment refers to the contour line of the arc-shaped notch that is concave toward the inner area of the tab 142 .
[0089] The connecting section 1423c is an important part of the third side 1423. The connection of the straight section is simple and direct, which is conducive to ensuring a uniform width transition of the tab 142. The concave arc section is adapted to the arc edge of the first welding area 130a, which is conducive to avoiding the first welding area 130a or the balancing valve 120.
[0090] Of course, in other embodiments, the connecting section 1423c may also be a combination of a wave shape, a straight line and a curve, etc.
[0091] In some embodiments, the tab 142 is welded to the transfer sheet 130 and a second welding region 130 b is formed in a middle region of the tab 142 .
[0092] The middle region of the tab 142 refers to a region of 2 / 5 to 3 / 5 of the length in any direction.
[0093] The second welding region 130 b may be, for example, a laser welding region, an ultrasonic welding region, or the like.
[0094] The second welding area 130 b is located in the middle area of the pole tab 142 , which is beneficial for stabilizing the pole tab 142 , thereby ensuring that the charge and discharge current continues to flow smoothly between the pole tab 142 and the adapter 130 .
[0095] In some embodiments, the second welding region 130b is rectangular.
[0096] The rectangular welding area can provide a larger contact area and increase the firmness of the welding connection.
[0097] In some embodiments, the number of bare cells 140 is multiple, and the multiple bare cells 140 are stacked along the second direction, wherein the pole ears 142 of a portion of the bare cells 140 extend from the first side 110a of the cover plate 110 along the second direction to the second side 110b, and the pole ears 142 of another portion of the bare cells 140 extend from the second side 110b of the cover plate 110 along the second direction to the first side 110a, wherein the first direction is perpendicular to the second direction.
[0098] The number of bare cells 140 is not limited, and can be 1, 2, 3, or 4.
[0099] The first side 110a and the second side 110b of the cover plate 110 refer to the side edges of the cover plate 110 on two opposite sides along the second direction. Figure 2 or Figure 3 direction shown.
[0100] With such configuration, more bare cells 140 can be stacked in a limited space of the battery cell, and the mass energy density is increased.
[0101] For example, in the embodiment of the present application, the number of bare cells 140 is 2 as an example for description. The positive pole tabs 142 of the two bare cells 140 are located on one side of the balancing valve 120 along the first direction, and the negative pole tabs 142 of the two bare cells 140 are located on the other side of the balancing valve 120 along the first direction. The positive pole tabs 142 of the two bare cells 140 are respectively welded to the same positive electrode adapter 130 to form two second welding areas 130b, and the positive electrode adapter 130 is welded to the positive electrode column to form a first welding area 130a. The negative pole tabs 142 of the two bare cells 140 are respectively welded to the same negative electrode adapter 130 to form another two second welding areas 130b, and the negative electrode adapter 130 is welded to the negative electrode column to form another first welding area 130a. That is to say, in this embodiment, there are four second welding areas 130b, two first welding areas 130a, and two adapters 130.
[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A battery cell, characterized in that: include: Cover plate; A balancing valve, arranged on the cover plate; Two poles are provided on the cover plate and spaced apart along a first direction, and the balancing valve is located between the two poles; At least two adapter plates, each of which is welded to the corresponding pole to form a first welding area; At least one bare battery cell, the bare battery cell comprising a main body and two tabs, each tab being electrically connected to the corresponding pole via the adapter; the tab comprising a first side edge close to one side of the main body and a second side edge away from the main body; In the projection of the plane where the cover plate is located, the pole lug, the first welding area and the balancing valve do not overlap each other; The second side edge is located between the first welding area and the balancing valve, and a width of the second side edge along the first direction is smaller than a width of the first side edge along the first direction.
2. The battery cell according to claim 1, characterized in that: A width of the second side along the first direction is smaller than a minimum distance between the balancing valve and the first welding area.
3. The battery cell according to claim 1, characterized in that: The width of the first side along the first direction is 1.2 to 2 times the width of the second side along the first direction.
4. The battery cell according to claim 1, characterized in that: A width of the first side along the first direction is greater than a minimum distance between the balancing valve and the first welding area.
5. The battery cell according to claim 4, characterized in that: The width of the first side along the first direction is 1.1 to 1.6 times the minimum distance between the balancing valve and the first welding area.
6. The battery cell according to claim 1, characterized in that: The first welding area is circular.
7. The battery cell according to any one of claims 1 to 6, characterized in that: The pole ear has a third side on two opposite sides along the first direction, and the third side connects the first side and the second side, wherein the third side includes a first outer rounded corner segment, a second outer rounded corner segment and a connecting segment, the first outer rounded corner segment is connected to the first side, the second outer rounded corner segment is connected to the second side, and the connecting segment connects the first outer rounded corner segment and the second outer rounded corner segment.
8. The battery cell according to claim 7, characterized in that: The connecting segment is a straight line segment, or the connecting segment is a concave arc segment.
9. The battery cell according to claim 1, characterized in that: The pole tab is welded to the adapter sheet and a second welding area is formed in the middle area of the pole tab.
10. The battery cell according to claim 9, characterized in that: The second welding area is rectangular.
11. The battery cell according to any one of claims 1 to 6, characterized in that: The number of the bare cells is multiple, and the multiple bare cells are stacked along the second direction, wherein the pole ears of a portion of the bare cells extend from the first side of the cover plate along the second direction to the second side, and the pole ears of another portion of the bare cells extend from the second side of the cover plate along the second direction to the first side, wherein the first direction is perpendicular to the second direction.
12. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 11.
13. An electrical device, characterized in that: Comprising the battery as claimed in claim 12.