Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery. The battery cell comprises a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece and the negative pole piece are superposed; a plurality of positive pole lugs are arranged on the positive pole piece, and at least one positive pole lug and other positive pole lugs are positioned on different sides; the diaphragm is positioned between the positive pole piece and the negative pole piece; a plurality of negative pole lugs are arranged on the negative pole piece, and at least one negative pole lug and other negative pole lugs are positioned on different sides. The battery cell can shunt current, improve the over-current capability of a confluence area, and avoid overheating while improving the charging and discharging efficiency, so as to effectively improve the working reliability and safety of the battery, optimize the performance of the battery and prolong the service life of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery. Background Art

[0002] With the rapid development of new energy vehicles, the charging efficiency and safety of batteries have become key technical challenges. Recently, major automobile enterprises and battery manufacturers have intensively released fast charging technologies, aiming to increase the charging rate and significantly shorten the charging time. However, the higher the charging rate means the greater the charging current. As the charging current increases, the thermal effect generated by the current increases accordingly, which poses a challenge to the over-current capacity of the battery. If the over-current capacity is insufficient, when the current exceeds the tolerable range, the internal heat of the battery is too high, and safety problems are extremely likely to occur. For a battery, the current density per unit area at the internal current collection part (i.e., the tab welding part) of the battery is the largest, the heat generation is the highest, and danger is most likely to occur.

[0003] In related technologies, the over-current capacity of the tab current collection part inside the battery is insufficient, which easily causes overheating inside the battery, damages the internal structure of the battery, reduces the battery performance, and causes safety problems such as battery short circuit, even combustion or explosion. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a battery cell. The battery cell can shunt the current, improve the over-current capacity of the current collection area, avoid overheating while improving the charge and discharge efficiency, and effectively improve the working reliability and safety of the battery, and optimize the battery performance and service life.

[0005] The utility model also provides a battery with the above battery cell.

[0006] The battery cell according to the first aspect embodiment of the utility model includes: a stacked positive electrode plate and a negative electrode plate, and a separator; a plurality of positive tabs are arranged on the positive electrode plate, and at least one of the positive tabs is located on a different side from the other positive tabs; the separator is located between the positive electrode plate and the negative electrode plate; a plurality of negative tabs are arranged on the negative electrode plate, and at least one of the negative tabs is located on a different side from the other negative tabs.

[0007] According to the battery cell of the utility model, by arranging a plurality of tabs on each electrode plate, when the plurality of tabs conduct electricity, the current can be shunted and introduced or led out from different directions (different sides of the electrode plate). In this way, the current density in the current collection area can be reduced, the over-current capacity of the current collection area can be improved, and overheating can be avoided while improving the charge and discharge efficiency. The working reliability and safety of the battery can be effectively improved, and the battery performance and service life can be optimized.

[0008] According to some embodiments of the present utility model, the number of the positive electrode tabs is the same as that of the negative electrode tabs.

[0009] In some embodiments, the positive electrode tabs and the negative electrode tabs on the same side are arranged staggeredly.

[0010] In some other embodiments, the positive electrode tabs and the negative electrode tabs on the opposite sides are arranged oppositely.

[0011] Furthermore, the number of tabs on each side is not limited to one.

[0012] According to the battery of the second aspect embodiment of the present utility model, the battery includes: at least one battery cell and a housing, the battery cell is configured as the battery cell described in any one of the above embodiments, and a plurality of the battery cells are stacked; the housing defines an accommodating space, and the battery cell is disposed in the accommodating space.

[0013] Furthermore, the side surface and the end surface of the housing are provided with a plurality of positive electrode posts and negative electrode posts, the positive electrode posts are adapted to be connected to the positive electrode tabs, and the negative electrode posts are adapted to be connected to the negative electrode tabs.

[0014] Furthermore, the number of the plurality of positive electrode posts is the same as the number of the positive electrode tabs of each positive electrode plate, and the plurality of positive electrode posts are respectively connected to the positive electrode tabs that overlap in the stacking direction on different positive electrode plates; the number of the plurality of negative electrode posts is the same as the number of the negative electrode tabs of each negative electrode plate, and the plurality of negative electrode posts are respectively connected to the negative electrode tabs that overlap in the stacking direction on different negative electrode plates.

[0015] In some embodiments, the positive electrode posts and the negative electrode posts on the same side are arranged staggeredly.

[0016] In some other embodiments, the positive electrode posts and the negative electrode posts on the opposite sides are arranged oppositely.

[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 Schematic diagram of a battery cell according to some embodiments of the present utility model Figure One ;

[0020] Figure 2 isFigure 1 Schematic diagram of the middle positive electrode tab;

[0021] Figure 3 is Figure 1 Schematic diagram of the middle negative electrode tab;

[0022] Figure 4 is Figure 1 Front view of the battery corresponding to the example battery cell;

[0023] Figure 5 is Figure 1 Top view of the battery corresponding to the example battery cell;

[0024] Figure 6 Schematic diagram of the battery cell according to some embodiments of the present utility model Figure Two ;

[0025] Figure 7 is Figure 6 Schematic diagram of the middle positive electrode tab;

[0026] Figure 8 is Figure 6 Schematic diagram of the middle negative electrode tab;

[0027] Figure 9 is Figure 6 Front view of the battery corresponding to the example battery cell;

[0028] Figure 10 is Figure 6 Top view of the battery corresponding to the example battery cell;

[0029] Figure 11 Schematic diagram of the battery cell according to some embodiments of the present utility model Figure Three ;

[0030] Figure 12 is Figure 11 Schematic diagram of the middle positive electrode tab;

[0031] Figure 13 is Figure 11 Schematic diagram of the middle negative electrode tab;

[0032] Figure 14 is Figure 11 Front view of the battery corresponding to the example battery cell;

[0033] Figure 15 is Figure 11 Left view of the battery corresponding to the example battery cell;

[0034] Figure 16 is Figure 11 Bottom view of the battery corresponding to the example battery cell;

[0035] Figure 17Schematic diagram of a battery cell according to some embodiments of the present utility model Figure Four ;

[0036] Figure 18 is Figure 17 Schematic diagram of the positive electrode tab in

[0037] Figure 19 is Figure 17 Schematic diagram of the negative electrode tab in

[0038] Figure 20 is Figure 17 Front view of the battery corresponding to the battery cell structure

[0039] Figure 21 is Figure 17 Left view of the battery corresponding to the battery cell structure

[0040] Reference numerals:

[0041] Battery 1;

[0042] Battery cell 11;

[0043] Positive electrode tab 111, positive electrode ear 1111;

[0044] Negative electrode tab 112, negative electrode ear 1121;

[0045] Shell 12;

[0046] Positive electrode terminal 121;

[0047] Negative electrode terminal 122;

[0048] Explosion-proof valve 13. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0050] 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 terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0051] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "attached" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The term "and / or" in this application is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0054] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0055] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0056] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0057] In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature.

[0058] The term "a plurality of" as used in this application refers to two or more (including two).

[0059] In this application, the battery may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of this application do not limit this. The battery may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of this application do not limit this either. Generally, the battery is divided into three types according to the encapsulation method: cylindrical battery, square battery cell and soft-pack battery, and the embodiments of this application do not limit this either.

[0060] The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. The battery generally includes a box body for encapsulating one or more battery cells or a plurality of battery modules. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0061] The following refers to Figures 1 - 18 Describe the battery cell 11 and the battery 1 according to the embodiments of the present utility model.

[0062] As Figure 1 、 Figure 6 、 Figure 11 And Figure 17As shown, the battery cell 11 according to the embodiment of the first aspect of the present utility model includes: a stacked positive electrode tab 111 and a negative electrode tab 112, and a separator.

[0063] Among them, a plurality of positive electrode tabs 1111 are provided on the positive electrode tab 111, and at least one positive electrode tab 1111 is located on a different side from the other positive electrode tabs 1111; the separator is located between the positive electrode tab 111 and the negative electrode tab 112; a plurality of negative electrode tabs 1121 are provided on the negative electrode tab 112, and at least one negative electrode tab 1121 is located on a different side from the other negative electrode tabs 1121.

[0064] Specifically, the positive electrode tab 111 and the negative electrode tab 112 can be stacked in the thickness direction. The positive electrode tab 111 and the negative electrode tab 112 are separated by a separator. The separator can prevent short circuits and play a role in protecting the electrode tabs to ensure the working safety and reliability of the battery cell 11; the positive electrode tab 111 and the negative electrode tab 112 respectively have a plurality of positive electrode tabs 1111 and a plurality of negative electrode tabs 1121, and at least one positive electrode tab 1111 on the positive electrode tab 111 is located on a different side from the other positive electrode tabs 1111, and at least one negative electrode tab 1121 on the negative electrode tab 112 is located on a different side from the other negative electrode tabs 1121. Exemplarily, the electrode tab can be a square electrode tab, and an electrode tab can be provided on any side of the electrode tab in the length or width direction, and at least one electrode tab is provided on the other side of the electrode tab. The electrode tab can be obtained by performing a die-cutting process on the electrode tab to form the electrode tab for current transmission.

[0065] It should be noted that the material of the separator can be PP (polypropylene) or PE (polyethylene), etc. The separator can include a coating layer, such as a coating layer of ceramic, boehmite, nanofiber or PVDF (polyvinylidene fluoride) used alone or in combination.

[0066] According to the battery cell 11 of the present utility model, by providing a plurality of electrode tabs on each electrode tab, when the plurality of electrode tabs conduct current, the current can be shunted and introduced or exported from different directions (different sides of the electrode tab). In this way, the current density in the current collection area can be reduced, and the overcurrent capacity of the current collection area can be improved. Thus, while improving the charge and discharge efficiency, overheating can be avoided, and the working reliability and safety of the battery 1 can be effectively improved, and the performance and life of the battery 1 can be optimized.

[0067] In addition, for the battery 1 with a large specific surface area and a long length, the electron transport path in the length direction of the battery 1 is long, which will increase the internal resistance of the current collector and increase the polarization at both ends of the battery 1 (i.e., the voltage drop at both ends of the battery 1 increases), resulting in an increase in the inconsistency of charge and discharge inside the battery 1 and deteriorating the charging capacity and lifespan of the battery 1. The structural form in which the tabs on the same electrode plate are arranged on different sides according to the present utility model can shorten the current loop and solve the problem of too long an electron loop, and can play a significant role in improving the high internal resistance of the current collector, large internal polarization, and large voltage drop at both ends of the electrode plate of the long battery 1.

[0068] As Figure 1 , Figure 6 , Figure 11 and Figure 17 shown, according to some embodiments of the present utility model, the number of positive electrode tabs 1111 is the same as that of negative electrode tabs 1121.

[0069] Specifically, the number of positive electrode tabs 1111 on each positive electrode plate 111 is the same as the number of negative electrode tabs 1121 on each negative electrode plate 112. For example, if the number of positive electrode tabs 1111 is two, the number of negative electrode tabs 1121 is also two; if the number of positive electrode tabs 1111 is five, the number of negative electrode tabs 1121 is also five. Keeping the number of positive electrode tabs 1111 and negative electrode tabs 1121 the same can ensure the electrical symmetry and balance of the battery cell 11, contribute to the uniform distribution of current during the charge and discharge process, avoid local overheating or overcharging, and is beneficial to improving the efficiency and lifespan of the battery cell 11.

[0070] As Figure 1 and Figure 6 shown, according to some embodiments of the present utility model, the positive electrode tabs 1111 and negative electrode tabs 1121 located on the same side are arranged staggeredly.

[0071] Specifically, the arrangement of the pole ears on the positive electrode sheet 111 and the negative electrode sheet 112 can be that a part of the positive electrode ear 1111 and a part of the negative electrode ear 1121 are located on the same side, another part of the positive electrode ear 1111 and another part of the negative electrode ear 1121 are located on the other same side, and the projections of the positive electrode ear 1111 and the negative electrode ear 1121 on the same side in the direction of stacking the pole sheets are staggered. Taking a square electrode sheet as an example, the square electrode sheet has a first side and a second side opposite to each other in the length direction, and a third side and a fourth side opposite to each other in the width direction. If the positive electrode sheet 111 and the negative electrode sheet 112 are provided with electrode ears on the first side and the second side, the positive electrode ear 1111 and the negative electrode ear 1121 located on the first side are spaced apart in the width direction, and the positive electrode ear 1111 and the negative electrode ear 1121 located on the second side are also spaced apart in the width direction; if the positive electrode sheet 111 and the negative electrode sheet 112 are provided with electrode ears on the first side and the third side, the positive electrode ear 1111 and the negative electrode ear 1121 located on the first side are spaced apart in the width direction, and the positive electrode ear 1111 and the negative electrode ear 1121 located on the third side are spaced apart in the length direction. By staggering the positive electrode tab 1111 and the negative electrode tab 1121 on the same side, the positive electrode tab 1111 and the negative electrode tab 1121 will not contact each other, thereby improving the safety of the battery cell 11 and facilitating uniform current distribution, thereby improving the performance and life of the battery cell 11.

[0072] Further, in some specific embodiments of the present invention, Figures 1 - 3 As shown, the pole ears on opposite sides of the same pole piece (such as the first side and the second side opposite in the length direction, or the third side and the fourth side opposite in the width direction) can be arranged opposite to each other, such as Figures 6 - 8 As shown, the pole ears on the opposite sides of the same pole piece can also be staggered in the relative direction. Both structural forms can meet the requirements of staggered arrangement of the positive pole ear 1111 and the negative pole ear 1121 on the same side. The relative position and number of the pole ears on the opposite sides are not limited here.

[0073] like Figure 11 and Figure 17 As shown, according to some embodiments of the present invention, the positive electrode tab 1111 and the negative electrode tab 1121 on the opposite side are arranged opposite to each other.

[0074] Specifically, the arrangement of the tabs on the positive electrode sheet 111 and the negative electrode sheet 112 may be such that a portion of the positive electrode tab 1111 and a portion of the negative electrode tab 1121 are located on the same side, another portion of the positive electrode tab 1111 and another portion of the negative electrode tab 1121 are located on the opposite side, and the positive electrode tab 1111 and the negative electrode tab 1121 on the opposite side are arranged opposite to each other. Similarly, a square electrode sheet is used for exemplary description, and the square electrode sheet has a first side and a second side opposite to each other in the length direction, and a third side and a fourth side opposite to each other in the width direction, such as Figures 11 - 13And Figures 17 - 19 As shown, if the positive electrode tab 1111 is provided on both the first side and the third side (or the fourth side) of the positive electrode plate 111, and the negative electrode tab 1121 is provided on both the first side and the fourth side (or the third side) of the negative electrode plate 112, then the positive electrode tab 1111 and the negative electrode tab 1121 located on the first side are spaced apart in the width direction, and the positive electrode tab 1111 and the negative electrode tab 1121 located on the third side and the fourth side are oppositely arranged in the width direction. By oppositely arranging the positive electrode tab 1111 and the negative electrode tab 1121 on the opposite sides, the electrical symmetry of the battery cell 11 can be improved, and the current distribution uniformity can be enhanced.

[0075] Such as Figure 1 、 Figure 6 、 Figure 11 And Figure 17 As shown, according to some embodiments of the present invention, the number of tabs on each side is not limited to one.

[0076] Specifically, the tabs are arranged on at least two sides of the electrode plate. The number of tabs on each side of the electrode plate can be one or more. By setting the number of tabs on each side to be multiple, the current density can be further reduced, overheating can be prevented, and the charge and discharge efficiency can be improved. Moreover, when it is necessary to expand the capacity of the battery 1 or construct a modular battery 1 system, increasing the number of tabs can provide more connection points, facilitating the expansion and combination of the battery 1; by setting the number of tabs on each side to be one, the manufacturing cost can be saved, the assembly can be facilitated, and the production efficiency can be improved.

[0077] Such as Figure 4 、 Figure 9 、 Figure 14 And Figure 20 As shown, according to the battery 1 of the second aspect embodiment of the present invention, the battery 1 includes: at least one battery cell 11 and a housing 12.

[0078] Among them, a plurality of battery cells 11 are stacked; the housing 12 defines an accommodation space, and the battery cells 11 are arranged in the accommodation space.

[0079] Specifically, the battery cell 11 is configured as the battery cell 11 described in any one of the above embodiments. A plurality of battery cells 11 can be stacked in sequence, and an accommodation space is formed in the housing 12. A plurality of battery cells 11 can be accommodated in the accommodation space. The housing 12 can play a good role in fixing, supporting, and protecting the battery cells 11 in the accommodation space. Since the battery cell 11 of the battery 1 according to the second aspect embodiment of the present invention is configured as the battery cell 11 described in any one of the above embodiments, therefore, this battery 1 can shunt the current through a plurality of tabs, optimize the overcurrent capacity of the current collecting area, improve the charge and discharge efficiency, and enhance the working reliability and safety of the battery 1.

[0080] In addition, in some specific embodiments of the present invention, such as Figure 5 、Figure 15 , Figure 16 and Figure 21 As shown in Figure 21 , an explosion-proof valve 13 is further provided on the housing 12. The explosion-proof valve 13 can release the internal pressure of the battery 1 by rupturing or opening, protect the housing 12 from being damaged by excessive pressure, and protect the internal components of the battery 1.

[0081] As Figure 4 , Figure 9 , Figure 14 and Figure 20 As shown in Figure 20 , according to some embodiments of the present invention, a plurality of positive electrode posts 121 and negative electrode posts 122 are provided on the side surface and the end surface of the housing 12. The positive electrode posts 121 are adapted to be connected to the positive electrode tabs 1111, and the negative electrode posts 122 are adapted to be connected to the negative electrode tabs 1121.

[0082] Specifically, the numbers of the positive electrode posts 121 and the negative electrode posts 122 are both configured to be plural. The positive electrode posts 121 can be connected to the positive electrode tabs 1111, and the negative electrode posts 122 can be connected to the negative electrode tabs 1121. The positions of the positive electrode posts 121 and the negative electrode posts 122 on the housing 12 can be arranged according to the connection requirements with the positive electrode tabs 1111 and the negative electrode tabs 1121. The positive electrode posts 121 and the negative electrode posts 122 can both be arranged on the side surface and the end surface of the housing 12. The positive electrode posts 121 and the negative electrode posts 122 are used to connect to an external circuit to conduct the circuit and realize the storage and release of electric energy.

[0083] As Figure 4 , Figure 9 , Figure 14 and Figure 20 As shown in Figure 20 , according to some embodiments of the present invention, the number of the plurality of positive electrode posts 121 is the same as the number of the positive electrode tabs 1111 on each positive electrode plate 111, and the plurality of positive electrode posts 121 are respectively connected to the positive electrode tabs 1111 that overlap in the stacking direction on different positive electrode plates 111; the number of the plurality of negative electrode posts 122 is the same as the number of the negative electrode tabs 1121 on each negative electrode plate 112, and the plurality of negative electrode posts 122 are respectively connected to the negative electrode tabs 1121 that overlap in the stacking direction on different negative electrode plates 112.

[0084] Specifically, after multiple battery cells 11 are stacked, the tabs of multiple electrode plates that overlap in the stacking direction can be connected to form an integral main tab. Since each electrode plate has multiple tabs, multiple main tabs can be formed from the multiple tabs on multiple electrode plates. For example, if each positive electrode plate 111 has two positive tabs 1111, after the battery cells 11 are stacked, the tabs on multiple positive electrode plates 111 can form two main positive tabs 1111. If each positive electrode plate 111 has three positive tabs 1111, after the battery cells 11 are stacked, the tabs on multiple positive electrode plates 111 can form three main positive tabs 1111. The tabs of multiple electrode plates that overlap in the stacking direction are connected to form an integral main tab for connection to the terminal post. The number of positive terminal posts 121 is the same as the number of positive tabs 1111 on each positive electrode plate 111, and the number of negative terminal posts 122 is the same as the number of positive tabs 1111 on each negative electrode plate 112. Thus, multiple positive terminal posts 121 can be respectively connected to different main positive tabs 1111, and multiple negative terminal posts 122 can be respectively connected to different main negative tabs 1121, forming multiple current shunt paths. Current can flow into or out of the battery cell 11 through different positive terminal posts 121 via different positive tabs 1111 and flow out of or into the battery cell 11 through different negative terminal posts 122 via different negative tabs 1121. Furthermore, the current is shunted into multiple parts to reduce the current density and optimize the overcurrent capacity of the current collection area.

[0085] It should be noted that the multiple positive terminal posts 121 are not interconnected with each other, and the multiple negative terminal posts 122 are not interconnected with each other to ensure that the multiple current shunt paths do not interfere with each other.

[0086] In addition, in some specific embodiments of the present invention, multiple layers of tabs that overlap in the stacking direction are welded together by ultrasonic welding to form an integral body. Ultrasonic welding has the advantages of good welding quality and high efficiency, which is beneficial to improving the reliability of the tabs and the assembly efficiency.

[0087] As Figure 4 、 Figure 5 、 Figure 9 and Figure 10 shown, according to some embodiments of the present invention, the positive terminal posts 121 and the negative terminal posts 122 on the same side are staggeredly arranged.

[0088] Specifically, in this embodiment, the positive electrode terminal 121 and the negative electrode terminal 122 on the same side are arranged staggeredly. Exemplarily, on one side surface of the housing 12, there are provided a positive electrode terminal 121 and a negative electrode terminal 122, and the positive electrode terminal 121 and the negative electrode terminal 122 are spaced apart in the height direction of the housing 12. By arranging the positive electrode terminal 121 and the negative electrode terminal 122 on the same side staggeredly, the arrangement mode of the terminals is adapted to the arrangement mode in which the positive electrode tab 1111 and the negative electrode tab 1121 on the same side are arranged staggeredly. On the one hand, it can ensure that the position of the positive electrode terminal 121 corresponds to the position of the positive electrode tab 1111, and the position of the negative electrode terminal 122 corresponds to the position of the negative electrode tab 1121 for connection. On the other hand, it can protect the positive electrode terminal 121 and the negative electrode terminal 122 from contacting each other, and the positive electrode tab 1111 and the negative electrode tab 1121 from contacting each other, so as to improve the working safety and reliability of the battery 1.

[0089] As Figure 14 , Figure 15 , Figure 16 , Figure 20 and Figure 21 shown, according to some embodiments of the present invention, the positive electrode terminal 121 and the negative electrode terminal 122 on the opposite sides are arranged oppositely.

[0090] Specifically, in this embodiment, the positive electrode terminal 121 and the negative electrode terminal 122 on the opposite sides are arranged oppositely. Exemplarily, on one side surface of the housing 12, there is provided a positive electrode terminal 121, and on the other side surface opposite to this side surface, there is provided a negative electrode terminal 122, and the positive electrode terminal 121 and the negative electrode terminal 122 are opposite to each other in the height direction of the housing 12. Similarly, by arranging the positive electrode terminal 121 and the negative electrode terminal 122 on the opposite sides oppositely, the arrangement mode of the terminals is adapted to the arrangement mode in which the positive electrode tab 1111 and the negative electrode tab 1121 on the opposite sides are arranged oppositely. On the one hand, it can ensure that the position of the positive electrode terminal 121 corresponds to the position of the positive electrode tab 1111, and the position of the negative electrode terminal 122 corresponds to the position of the negative electrode tab 1121 for connection. On the other hand, it can protect the positive electrode terminal 121 and the negative electrode terminal 122 from contacting each other, and the positive electrode tab 1111 and the negative electrode tab 1121 from contacting each other, so as to improve the working safety and reliability of the battery 1.

[0091] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0092] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, Comprising: A stacked positive electrode tab (111) and a negative electrode tab (112); a plurality of positive electrode ears (1111) are provided on the positive electrode tab (111), and at least one of the positive electrode ears (1111) is on a different side from the other positive electrode ears (1111); A separator, which is located between the positive electrode tab (111) and the negative electrode tab (112); A negative electrode tab (112), a plurality of negative electrode ears (1121) are provided on the negative electrode tab (112), and at least one of the negative electrode ears (1121) is on a different side from the other negative electrode ears (1121).

2. The battery cell according to claim 1, characterized in that, The number of the positive electrode ears (1111) is the same as that of the negative electrode ears (1121).

3. The battery cell according to claim 2, wherein The positive electrode ears (1111) and the negative electrode ears (1121) on the same side are arranged staggeredly.

4. The cell according to claim 2, wherein The positive electrode ears (1111) and the negative electrode ears (1121) on the opposite sides are arranged oppositely.

5. The battery cell according to claim 4, wherein The number of ears on each side is not limited to one.

6. A battery, characterized in that, Comprising: At least one battery cell, the battery cell being configured as the battery cell according to any one of claims 1-5, and a plurality of the battery cells are stacked; A housing (12), the housing (12) defining an accommodation space, and the battery cell is disposed in the accommodation space.

7. The battery according to claim 6, wherein, A plurality of positive electrode terminals (121) and negative electrode terminals (122) are provided on the side surface and the end surface of the housing (12), the positive electrode terminals (121) are adapted to be connected to the positive electrode ears (1111), and the negative electrode terminals (122) are adapted to be connected to the negative electrode ears (1121).

8. The battery according to claim 7, characterized in that, The number of the plurality of positive electrode terminals (121) is the same as the number of the positive electrode ears (1111) on each positive electrode tab (111), and the plurality of positive electrode terminals (121) are respectively connected to the positive electrode ears (1111) that overlap in the stacking direction on different positive electrode tabs (111); the number of the plurality of negative electrode terminals (122) is the same as the number of the negative electrode ears (1121) on each negative electrode tab (112), and the plurality of negative electrode terminals (122) are respectively connected to the negative electrode ears (1121) that overlap in the stacking direction on different negative electrode tabs (112).

9. The battery according to claim 8, wherein The positive electrode terminals (121) and the negative electrode terminals (122) on the same side are arranged staggeredly.

10. The battery according to claim 8, wherein, The positive electrode terminals (121) and the negative electrode terminals (122) on the opposite sides are arranged oppositely.

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