Battery monomer, battery device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and relates to the technical field of batteries. The battery monomer can improve the connection reliability of the pole and the electrode assembly. The battery monomer comprises a shell, an electrode assembly, a pole and a clamping piece, wherein the shell is enclosed to form an accommodating cavity; the electrode assembly is mounted in the accommodating cavity and comprises at least two layers of pole pieces, and the pole pieces extend to form pole lugs; one part of the pole is positioned in the accommodating cavity and corresponds to the tab, and the other part of the pole penetrates through the shell and extends out of the shell; the clamping piece is clamped on the pole lug, and one side, far away from the pole lug, of the clamping piece is connected with the pole column, so that the pole lug is electrically connected with the pole column. The battery monomer provided by the utility model is used for providing voltage and capacity.

Description

Technical Field

[0001] This application relates to the technical field of batteries, in particular to battery cells, battery devices and electrical devices. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field and so on.

[0003] As an important component in a battery, a terminal can provide clear positive and negative connection points for the battery, so that the battery can be correctly connected to other electrical components. The terminal is usually electrically connected to the electrode assembly inside the battery by welding. However, there is a problem of cracking in the welding area between the terminal and the tab on the electrode assembly, which will result in insufficient current-carrying area between the tab and the terminal, thus affecting the normal use of the battery. Summary of the Utility Model

[0004] This application provides a battery cell, a battery device and an electrical device, which can improve the connection reliability between the terminal and the electrode assembly in the battery cell.

[0005] In a first aspect of this application, a battery cell is provided. The battery cell includes: a housing, an electrode assembly, a terminal and a clamping member. Among them, the housing encloses to form a receiving cavity; the electrode assembly is installed in the receiving cavity, the electrode assembly includes at least two layers of electrode plates, and tabs extend from the electrode plates; a part of the terminal is located in the receiving cavity at a position corresponding to the tab, and the other part passes through the housing and extends to the outside of the housing; the clamping member clamps the tab, and the side of the clamping member away from the tab is connected to the terminal to electrically connect the tab and the terminal.

[0006] The battery cell provided by the present application has an electrode assembly installed inside the housing, and the housing can provide protection and a stable accommodation environment for the electrode assembly. Moreover, by passing the pole column through the housing, the pole column can be connected to the tab to extend the electrode assembly outside the housing, so as to facilitate electrically connecting the electrode assembly to an electrical device or an external conductor through the pole column. At the same time, a clamping member is clamped on the tab, and the clamping member can clamp and fix the tab of the multi-layer laminated structure, which is beneficial to improving the structural strength of the tab. The clamping member can also be electrically connected to the pole column to electrically connect the tab and the pole column through the clamping member. Compared with the related art, in which the tab is directly electrically connected to the pole column and the tab has a multi-layer structure, cracking and the like are likely to occur due to the connection structure between the multi-layer tabs and the pole column, reducing the current-carrying area between the tab and the pole column. In the battery cell provided by the present application, since the tab and the pole column are electrically connected through the clamping member, not only can the strength of the tab be increased through the clamping member to reduce the risk of cracking in the connection structure between the tab and the pole column, but also even if cracking occurs inside the tab, because the clamping member clamps and covers the outside of the tab and the clamping member is connected to the pole column, there can still be a sufficient current-carrying area between the tab and the pole column. Therefore, the battery cell provided by the present application can improve the reliability of the connection between the pole column and the electrode assembly.

[0007] In a possible implementation manner of the present application, the clamping member includes a first clamping portion and a second clamping portion that are connected and satisfy a parallel relationship. A clamping cavity is formed between the first clamping portion and the second clamping portion, the tab is fixed in the clamping cavity, and one of the first clamping portion and the second clamping portion is connected to the pole column.

[0008] In the technical solution of the present application, since the clamping member includes a first clamping portion and a second clamping portion that are connected and satisfy a parallel relationship, the tab can be clamped by the first clamping portion and the second clamping portion, facilitating the connection between the clamping member and the tab, and increasing the connection area between the clamping member and the tab. At the same time, one of the first clamping portion and the second clamping portion can be connected to the pole column, thereby connecting the tab and the pole column through the clamping member, which is beneficial to reducing the occurrence of cracking caused by directly connecting the tab and the pole column.

[0009] In a possible implementation manner of the present application, a first folding edge is formed at one end of the first clamping portion away from the second clamping portion, and the first folding edge fits on the side of the first clamping portion away from the clamping cavity; and / or, a second folding edge is formed at one end of the second clamping portion away from the first clamping portion, and the second folding edge fits on the side of the second clamping portion away from the clamping cavity.

[0010] In the technical solution of the present application, since the first folding edge is formed on the first clamping portion and the second folding edge is formed on the second clamping portion, a relatively smooth surface can be formed at the ends of both the first clamping portion and the second clamping portion. In this way, after connecting the clamping member to the tab, the occurrence of the tab being cut by the sharp corners and thin edges on the clamping member, resulting in the tab breaking, can be reduced.

[0011] In a possible implementation manner of the present application, the tab and the clamping member are fixedly connected by ultrasonic welding, and an ultrasonic welding area is formed between the tab and the clamping member; the clamping member and the pole column are fixedly connected by laser welding, and a laser welding area is formed between the clamping member and the pole column.

[0012] In the technical solution of the present application, since the tab and the clamping member are welded by ultrasonic welding, not only can a stable and reliable laser welding area be formed between the clamping member and the tab, but also the tabs in the multi-layer laminated tab structure can be welded to each other, so that the clamping member and the tab can form an integral structure. At the same time, by laser welding the clamping member and the pole column, a reliable electrical connection can be formed between the clamping member and the pole column, thereby improving the reliability of the connection between the tab and the pole column, and being beneficial to reducing the problem that the current-carrying area of the tab and the pole column is reduced due to cracking in some areas of the tab.

[0013] In a possible implementation manner of the present application, the orthographic projection of the laser welding area on the ultrasonic welding area is located within the ultrasonic welding area.

[0014] In the technical solution of the present application, since the orthographic projection of the laser welding area on the ultrasonic welding area is located within the ultrasonic welding area, the influence of the heat generated on the clamping member during laser welding on the ultrasonic welding area can be reduced, which is beneficial to maintaining a stable welding structure between the clamping member and the tab.

[0015] In a possible implementation manner of the present application, the area of the ultrasonic welding area is greater than or equal to 1.2 times the area of the laser welding area.

[0016] In the technical solution of the present application, since the area of the ultrasonic welding area is greater than or equal to 1.2 times the area of the laser welding area, the edge portion of the ultrasonic welding area that does not overlap with the laser welding area can have a sufficient area, so that a large area of the ultrasonic welding area between the clamping member and the tab will not be affected by the heat generated on the clamping member during laser welding.

[0017] In a possible implementation manner of the present application, the orthographic projection of one of the first folding edge and the second folding edge that abuts against the pole column on the laser welding area does not overlap with the laser welding area.

[0018] In the technical solution of the present application, since the orthographic projections of the first folding edge and the second folding edge on the laser welding area do not overlap with the laser welding area, when the clamping member and the pole column are welded by laser welding, the influence of the small gap between the clamping portion and the pole column caused by the folding edge on the laser welding can be reduced, which is beneficial to improving the laser welding quality of the clamping member and the pole column.

[0019] In a possible implementation manner of the present application, a welding surface facing the pole column on one of the first clamping portion and the second clamping portion fixedly connected to the pole column has a rough area, and the rough area overlaps with the laser welding area, and the rough area is used to increase the roughness of the welding surface.

[0020] In the technical solution of the present application, since there is a rough area on the welding surfaces of the first clamping portion and the second clamping portion, during the process of welding the clamping member and the pole column by laser welding, the reflection of the laser by the welding surface can be reduced, which is beneficial to improving the welding quality of the clamping member and the pole column.

[0021] In a possible implementation manner of the present application, the wall thickness of the clamping member is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

[0022] In the technical solution of the present application, since the wall thickness of the clamping member is less than or equal to 1.5 mm and greater than or equal to 0.1 mm, this can not only make the clamping member have a smaller weight, which is beneficial to reducing the overall weight of the battery cell, but also can meet the welding requirements between the tab and the clamping member, and between the clamping member and the pole column.

[0023] In a possible implementation manner of the present application, the outer shell includes a shell body and an end cover. The shell body has an opening matching the end cover, and the end cover has a through hole matching the pole column; the end cover is sealingly connected to the opening to form an accommodation cavity, and the pole column extends through the through hole to the side of the end cover away from the accommodation cavity from within the accommodation cavity.

[0024] In the technical solution of the present application, since the outer shell includes a shell body and an end cover, it is convenient to process the outer shell. And the end cover and the shell body are sealingly connected, and an outer shell with a sealed accommodation cavity can be formed.

[0025] The second aspect of the present application provides a battery device, which includes: a box body and the battery cell provided in any one of the first aspects above. Wherein, the box body has an installation cavity; the battery cell is installed in the installation cavity.

[0026] For the battery device provided by the present application, since it includes the battery cell provided in any one of the above, the reliability of the connection between the pole column and the electrode assembly can be improved, thereby the performance stability of the battery cell can be improved, and further the working stability of the battery device can be enhanced.

[0027] The third aspect of the present application provides an electrical device, which includes the battery cell for providing electrical energy provided in any one of the above first aspects or the battery device provided in the above second aspect.

[0028] Since the electrical device provided in the present application includes the above-provided battery cell or electrical device, the performance stability of the battery cell can be improved, and thus the stability and continuity of the operation of the electrical device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the battery cell provided in the present application;

[0031] Figure 2 is provided in the present application Figure 1 is a cross-sectional view taken along the A-A direction in ;

[0032] Figure 3 is provided in the present application Figure 2 is an enlarged schematic view of part B in ;

[0033] Figure 4 is a schematic structural diagram of the clamping member in the battery cell provided in the present application Figure 1 ;

[0034] Figure 5 is a schematic structural diagram of the clamping member in the battery cell provided in the present application Figure 2 ;

[0035] Figure 6 is a schematic structural diagram of the battery device provided in the present application Figure 1 ;

[0036] Figure 7 is provided in the present application Figure 6 is an enlarged schematic view of part C in ;

[0037] Figure 8 is a schematic structural diagram of the clamping member in the battery cell provided in the present application Figure 3 ;

[0038] Figure 9 is a schematic structural diagram of the battery device provided in the present application Figure 2 ;

[0039] Figure 10 is a schematic structural diagram of the electrical device provided in the present application.

[0040] Description of the reference numerals in the drawings:

[0041] 1 - Outer shell; 11 - Housing; 12 - End cap; 2 - Electrode assembly; 21 - Tab; 3 - Terminal post; 4 - Clamping member; 41 - First clamping portion; 42 - Second clamping portion; 43 - Clamping cavity; 44 - First folding edge; 45 - Second folding edge; 46 - Rough area; 100 - Battery device; 110 - Box body; 111 - First box body; 112 - Second box body; 120 - Battery cell; 200 - Controller; 300 - Motor; T1 - Wall thickness; T2 - Tab thickness; S1 - Laser welding area; S2 - Ultrasonic welding area. Detailed implementation manners

[0042] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the description of the specification and the above drawings are intended to cover non-exclusive inclusion.

[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 quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0045] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears 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. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can 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 can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[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] New energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0051] In many application scenarios, the battery will be vibrated and the various parts inside the battery will also vibrate. In the process of vibration of the pole, electrode assembly, etc. in the battery, the weld between the pole ear and the pole on the electrode assembly may crack. Or in the process of producing batteries, when welding the pole ear and the pole, cracks may occur in the welding area between the pole ear and the pole due to stress and other reasons. These situations will reduce the flow area between the pole ear and the pole, and reduce the reliability of the connection between the electrode assembly and the pole, thereby affecting the normal use of the battery.

[0052] The present application embodiment provides a battery cell, referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1Schematic structural diagram of the battery cell provided by this application Figure 2 Provided by this application Figure 1 Cross-sectional view along the A-A direction in Figure 3 Provided by this application Figure 2 Enlarged schematic view of part B in Figure 4 Schematic structure of the clamping member in the battery cell provided by this application Figure 1 The battery cell 120 provided by the embodiments of this application includes: a housing 1, an electrode assembly 2, a pole column 3, and a clamping member 4. Among them, the housing 1 encloses to form a receiving cavity; the electrode assembly 2 is installed in the receiving cavity, the electrode assembly 2 includes at least two layers of electrode plates, and electrode tabs 21 extend from the electrode plates; a part of the pole column 3 is located in the receiving cavity at a position corresponding to the electrode tab 21, and the other part passes through the housing 1 and extends to the outside of the housing 1; the clamping member 4 clamps the electrode tab 21, and the side of the clamping member 4 away from the electrode tab 21 is connected to the pole column 3 to electrically connect the electrode tab 21 and the pole column 3.

[0053] In the embodiments of this application, as Figure 1 and Figure 2 shown, the housing 1 is used to encapsulate components such as the electrode assembly 2 and the electrolyte. The housing 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 1), or an aluminum-plastic film, etc.

[0054] Exemplarily, the housing 1 can be a sealed structure or a non-sealed structure. For example, when the housing 1 is a non-sealed structure, the housing 1 plays a role in protecting the electrode assembly 2, and a sealing bag is further included between the housing 1 and the electrode assembly 2, and the sealing bag is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film, etc.

[0055] In the embodiments of this application, as Figure 2 shown, the electrode assembly 2 can be installed in the receiving cavity enclosed by the housing 1. The electrode assembly 2 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 120, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes, and at the same time allow active ions to pass through.

[0056] Exemplarily, the positive electrode can be a positive electrode plate, and the positive electrode plate can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector. For example, the positive electrode current collector can be a metal foil or a composite current collector. The positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds.

[0057] Another example, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector. For example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector.

[0058] In another example, the positive electrode sheet and the negative electrode sheet can be wound into a wound electrode assembly 2. A plurality of positive electrode sheets and a plurality of negative electrode sheets can also be alternately stacked to form a laminated electrode assembly 2. A positive electrode tab can be extended from one side of the plurality of positive electrode sheets, and a negative electrode tab can be extended from one side of the plurality of negative electrode sheets, so as to lead out the current from the electrode assembly 2 through the electrode tab 21.

[0059] In the embodiments of the present application, as Figure 2 and Figure 3 shown, the electrode assembly 2 can be extended to the outside of the housing 1 through the electrode post 3, so as to connect the electrode assembly 2 to an electrical device or an external conductor. For example, two through holes matching the electrode post 3 can be provided on the housing 1, and the two electrode posts 3 are respectively inserted into the two through holes on the housing 1. In this way, the positive electrode tab can be connected to one electrode post 3, and the negative electrode tab can be connected to the other electrode post 3, so that the electrode assembly 2 can be extended to the outside of the housing 1 through the electrode post 3.

[0060] In the embodiments of the present application, as Figure 3 shown, the electrode tab 21 can be electrically connected to the electrode post 3 through the clamping member 4. For example, according to the size and shape of the electrode tab 21, the structure and shape of the clamping member 4 can be set. If the clamping member 4 is set to a structure similar to a clip, the clamping member 4 can be clamped and wrapped around the electrode tab 21. In this way, the multi-layer laminated electrode tab 21 (one electrode tab is extended at the corresponding position on each layer of positive electrode sheet, and multiple electrode tabs are stacked to form a positive electrode tab; one electrode tab is extended at the corresponding position on each layer of negative electrode sheet, and multiple electrode tabs are stacked to form a negative electrode tab) can be fixed by the clamping member 4.

[0061] Exemplarily, the extending direction of the electrode tab 21 can be parallel or nearly parallel to the end face of the electrode post 3 located in the accommodating cavity. After the clamping member 4 is clamped on the electrode tab 21, the portion of the clamping member 4 located between the electrode tab 21 and the electrode post 3 can be made parallel to the electrode post 3, and then the side of the clamping member 4 far from the electrode tab 21 can be electrically connected to the electrode post 3, so as to electrically connect the electrode tab 21 to the corresponding electrode post 3 through the clamping member 4.

[0062] The battery cell 120 provided by the embodiment of the present application. Since the electrode assembly 2 is installed in the housing 1, the housing 1 can provide protection and a stable accommodation environment for the electrode assembly 2. And by passing the pole column 3 through the housing 1, the pole column 3 can be connected to the tab 21, so as to extend the electrode assembly 2 to the outside of the housing 1, facilitating the electrical connection of the electrode assembly 2 to an electrical device or an external conductor through the pole column 3. At the same time, a clamping member 4 is clamped on the tab 21, and the laminated tab structure of multiple layers can be clamped and fixed by the clamping member 4, which is beneficial to improving the structural strength of the tab 21. The clamping member 4 can also be electrically connected to the pole column 3, so as to electrically connect the tab 21 and the pole column 3 through the clamping member 4. Compared with the related art, where the tab 21 is directly electrically connected to the pole column 3 and the tab 21 has a multi-layer structure, cracks are likely to occur in the connection structure between the multi-layer tab 21 and the pole column 3, reducing the current-carrying area between the tab 21 and the pole column 3. In the battery cell 120 provided by the embodiment of the present application, since the tab 21 and the pole column 3 are electrically connected through the clamping member 4, not only can the strength of the tab 21 be increased by the clamping member 4 to reduce the risk of cracking in the connection structure between the tab 21 and the pole column 3; but also even if cracks occur inside the tab 21, because the clamping member 4 clamps and covers the outside of the tab 21 and the clamping member 4 is connected to the pole column 3, there can still be a sufficient current-carrying area between the tab 21 and the pole column 3. Therefore, the battery cell 120 provided by the embodiment of the present application can improve the reliability of the connection between the pole column 3 and the electrode assembly 2.

[0063] In some possible embodiments of the present application, with reference to Figure 4 and Figure 5 , Figure 4 and Figure 5 both show schematic structural diagrams of the clamping member in the battery cell provided by the present application. The clamping member 4 includes a first clamping portion 41 and a second clamping portion 42 that are connected and satisfy a parallel relationship. A clamping cavity 43 is formed between the first clamping portion 41 and the second clamping portion 42, the tab 21 is fixed in the clamping cavity 43, and one of the first clamping portion 41 and the second clamping portion 42 is connected to the pole column 3.

[0064] In the embodiment of the present application, as shown in Figure 4 and Figure 5 , the clamping member 4 can be set to an approximately U-shaped structure, that is, the clamping member 4 includes a first clamping portion 41 and a second clamping portion 42 that are parallel or nearly parallel. And the first clamping portion 41 and the second clamping portion 42 are connected as a whole. In this way, a clamping cavity 43 can be formed between the first clamping portion 41 and the second clamping portion 42 to fix at least a part of the tab 21 in the clamping cavity 43, and one of the first clamping portion 41 and the second clamping portion 42 can be fixedly connected to the pole column 3.

[0065] Exemplarily, the sizes of the first clamping portion 41 and the second clamping portion 42 can be set according to the size of the tab 21. For example, the first clamping portion 41 and the second clamping portion 42 can be set to have the same size and shape, and the length and width of the first clamping portion 41 and the second clamping portion 42 are both smaller than the length and width of the tab 21. The distance between the first clamping portion 41 and the second clamping portion 42 can also be set according to the thickness of the tab 21. For example, the distance between the first clamping portion 41 and the second clamping portion 42 is equal to the thickness of the tab 21, or slightly smaller than the thickness of the tab 21, such as 0.2 mm smaller than the thickness of the tab 21. In this way, the clamping member 4 can be stably clamped on the tab 21, so as to facilitate the fixed connection between the clamping member 4 and the tab 21.

[0066] In the above embodiment, since the clamping member 4 includes a first clamping portion 41 and a second clamping portion 42 that are connected and satisfy a parallel relationship, the tab 21 can be clamped by the first clamping portion 41 and the second clamping portion 42, so as to facilitate the connection between the clamping member 4 and the tab 21, and the connection area between the clamping member 4 and the tab 21 can be increased. At the same time, one of the first clamping portion 41 and the second clamping portion 42 can be connected to the pole column 3, so that the tab 21 and the pole column 3 can be connected through the clamping member 4, which is beneficial to reducing the occurrence of cracking caused by the direct connection between the tab 21 and the pole column 3.

[0067] In some possible embodiments of the present application, such as Figure 4 and Figure 5 shown, a first folding edge 44 is formed at one end of the first clamping portion 41 away from the second clamping portion 42, and the first folding edge 44 fits on the side of the first clamping portion 41 away from the clamping cavity 43; and / or, a second folding edge 45 is formed at one end of the second clamping portion 42 away from the first clamping portion 41, and the second folding edge 45 fits on the side of the second clamping portion 42 away from the clamping cavity 43.

[0068] In the embodiment of the present application, a folding edge can be provided on the clamping portion of the clamping member 4 to reduce the influence of the clamping member 4 on the tab 21 through the folding edge structure.

[0069] Exemplarily, the first folding edge 44 can be formed at one end of the first clamping portion 41 away from the second clamping portion 42 by folding. The first folding edge 44 folds from the first clamping portion 41 in a direction away from the clamping cavity 43 and can fit on the surface of the first clamping portion 41 away from the clamping cavity 43. In this way, a relatively smooth surface can be formed at one end of the first clamping portion 41 away from the second clamping portion 42.

[0070] In another example, a second folding edge 45 can also be formed at one end of the second clamping part 42 away from the first clamping part 41 by folding. The second folding edge 45 folds away from the clamping cavity 43 from the second clamping part 42 and can be attached to the surface of the second clamping part 42 away from the clamping cavity 43. In this way, a relatively smooth surface can be formed at one end of the second clamping part 42 away from the first clamping part 41.

[0071] It should be noted that folding edges can be provided on both the first clamping part 41 and the second clamping part 42 at the same time, or a first folding edge 44 can be provided on the first clamping part 41, and a second folding edge 45 can be provided on the second clamping part 42.

[0072] In the above embodiment, since the first folding edge 44 is formed on the first clamping part 41 and the second folding edge 45 is formed on the second clamping part 42, relatively smooth surfaces can be formed at the ends of both the first clamping part 41 and the second clamping part 42. In this way, after the clamping member 4 is connected to the tab 21, the occurrence of the tab 21 being cut by the sharp corners and thin edges on the clamping member 4 resulting in the fracture of the tab 21 can be reduced.

[0073] In some possible embodiments of the present application, refer to Figure 6 and Figure 7 , Figure 6 is a schematic structural diagram of the battery device provided by the present application Figure 1 , Figure 7 is the enlarged schematic diagram of part C provided by the present application Figure 6 . The tab 21 and the clamping member 4 are fixedly connected by ultrasonic welding, and an ultrasonic welding zone S2 is formed between the tab 21 and the clamping member 4; the clamping member 4 and the pole column 3 are fixedly connected by laser welding, and a laser welding zone S1 is formed between the clamping member 4 and the pole column 3.

[0074] In the embodiment of the present application, as Figure 7 shown, after the clamping member 4 is clamped on the tab 21, the clamping member 4 and the tab 21 can be fixedly connected by welding, and the clamping member 4 and the pole column 3 can be fixedly connected by welding.

[0075] Exemplarily, the clamping member 4 and the tab 21 can be welded by ultrasonic welding. During the process of welding the clamping member 4 and the tab 21 by ultrasonic welding, high-frequency vibration waves are transmitted to the adjacent surfaces of the clamping member 4 and the tab 21. Under pressure, the surfaces of the clamping member 4 and the abutting tab 21 rub against each other to form a fusion between the molecular layers, thereby welding the tab 21 to the clamping member 4 and forming an ultrasonic welding zone S2 between the tab 21 and the clamping member 4. During the process of welding the clamping member 4 and the tab 21 by ultrasonic welding, welding can also be formed between each adjacent two layers of the tab 21 with a multi-layer laminated structure. In this way, the multi-layer tab 21 and the clamping member 4 can be welded into an integral structure.

[0076] In another example, the clamping member 4 and the terminal 3 can be welded by laser welding. For example, after the ultrasonic welding of the clamping member 4 and the tab 21 is completed, the clamping member 4 together with the electrode assembly 2 is placed at a position corresponding to the terminal 3, that is, the terminal 3 is abutted against the first clamping portion 41 or the second clamping portion 42 on the clamping member 4, and then the terminal 3 and the clamping member 4 are welded by laser welding to form a laser welding zone S1 between the first clamping portion 41 or the second clamping portion 42 abutting against the terminal 3 and the terminal 3.

[0077] In the above embodiment, since the tab 21 and the clamping member 4 are welded by ultrasonic welding, not only can a stable and reliable laser welding zone be formed between the clamping member 4 and the tab 21, but also welding can be formed between the layers of the tab 21 with a multi-layer laminated structure, so that the clamping member 4 and the tab 21 can be formed into an integral structure. At the same time, by laser welding the clamping member 4 and the terminal 3, a reliable electrical connection can be formed between the clamping member 4 and the terminal 3, thereby improving the reliability of the connection between the tab 21 and the terminal 3 and being beneficial to reducing the problem that the current-carrying area of the tab 21 and the terminal 3 is reduced due to cracking in some areas of the tab 21.

[0078] In some possible embodiments of the present application, as Figure 7 shown, the orthographic projection of the laser welding zone S1 on the ultrasonic welding zone S2 is located within the ultrasonic welding zone S2.

[0079] In the embodiments of the present application, as Figure 7As shown, during the ultrasonic welding of the clamping member 4 and the tab 21, the entire overlapping area of the clamping member 4 and the tab 21 can be ultrasonically welded, or a partial overlapping area of the clamping member 4 and the tab 21 can be ultrasonically welded, that is, the ultrasonic welding area S2 formed between the clamping member 4 and the tab 21 is less than or equal to the overlapping area of the clamping member 4 and the tab 21. During the laser welding of the clamping member 4 and the terminal 3, the area of the laser welding area S1 formed between the clamping member 4 and the terminal 3 can be made smaller than the area of the ultrasonic welding area S2, and the orthographic projection of the laser welding area S1 within the ultrasonic welding area S2 is completely located within the ultrasonic welding area S2.

[0080] In the above embodiment, since the orthographic projection of the laser welding area S1 within the ultrasonic welding area S2 is located within the ultrasonic welding area S2, the influence of the heat generated on the clamping member 4 during laser welding on the ultrasonic welding area S2 can be reduced, which is beneficial to maintaining a stable welding structure between the clamping member 4 and the tab 21.

[0081] In some possible embodiments of the present application, the area of the ultrasonic welding area S2 is greater than or equal to 1.2 times the area of the laser welding area S1.

[0082] In the embodiments of the present application, the reliability of the welding structure between the tab 21 and the clamping member 4, and between the clamping member 4 and the terminal 3 can be improved by more precisely controlling the respective areas of the ultrasonic welding area S2 and the laser welding area S1.

[0083] Exemplarily, the area of the ultrasonic welding area S2 can be made 1.2 times the area of the laser welding area S1, or the area of the ultrasonic welding area S2 can be made greater than 1.2 times the area of the laser welding area S1. And the orthographic projection of the laser welding area S1 within the ultrasonic welding area S2 is made as centered as possible within the ultrasonic welding area S2.

[0084] In the above embodiment, since the area of the ultrasonic welding area S2 is greater than or equal to 1.2 times the area of the laser welding area S1, the edge portion of the ultrasonic welding area S2 that does not overlap with the laser welding area S1 can have a sufficient area, so that a relatively large area of the ultrasonic welding area S2 between the clamping member 4 and the tab 21 will not be affected by the heat generated on the clamping member 4 during laser welding.

[0085] In some possible embodiments of the present application, as Figure 3 and Figure 5 shown, the orthographic projection of the one of the first folding edge 44 and the second folding edge 45 that abuts against the terminal 3 within the laser welding area S1 does not overlap with the laser welding area S1.

[0086] In the embodiments of the present application, when the first clamping portion 41 on the clamping member 4 is welded to the pole post 3, the first folding edge 44 on the first clamping portion 41 is located between the first clamping portion 41 and the pole post 3. When the second clamping portion 42 on the clamping member 4 is welded to the pole post 3, the second folding edge 45 on the second clamping portion 42 is located between the second clamping portion 42 and the pole post 3.

[0087] Exemplarily, whether the first clamping portion 41 is welded to the pole post 3 or the second clamping portion 42 is welded to the pole post 3, it is necessary to reduce the influence of the folding edge on the welding between the clamping member 4 and the pole post 3. Therefore, the orthographic projection of the first folding edge 44 and the second folding edge 45 in the laser welding area S1 can be located outside the laser welding area S1, that is, there can be a certain gap between one of the first folding edge 44 or the second folding edge 45 that abuts against the pole post 3 and the laser welding area S1.

[0088] In the above embodiments, since the orthographic projections of the first folding edge 44 and the second folding edge 45 in the laser welding area S1 do not overlap with the laser welding area S1, when the clamping member 4 and the pole post 3 are welded by laser welding, the influence of the small gap between the clamping portion and the pole post 3 caused by the folding edge on the laser welding can be reduced, which is beneficial to improving the laser welding quality of the clamping member 4 and the pole post 3.

[0089] In some possible embodiments of the present application, with reference to Figure 8 , Figure 8 is a schematic structural view of the clamping member in the battery cell provided by the present application Figure 3 . One of the first clamping portion 41 and the second clamping portion 42 that is fixedly connected to the pole post 3 has a rough area 46 on the welding surface facing the pole post 3, and the rough area 46 overlaps with the laser welding area S1, and the rough area 46 is used to increase the roughness of the welding surface.

[0090] In the embodiments of the present application, a rough area 46 can be provided on the welding surfaces of the first clamping portion 41 and the second clamping portion 42 to increase the roughness of the welding surface through the rough area 46. The welding surface of the first clamping portion 41 is the surface of the first clamping portion 41 away from the clamping cavity 43, and the welding surface of the second clamping portion 42 is the surface of the second clamping portion 42 away from the clamping cavity 43.

[0091] Exemplarily, embossing can be performed on the welding surfaces of the first clamping portion 41 and the second clamping portion 42, for example, rolling the welding surface with an embossing roller with a pattern to form an uneven rough area 46 on the welding surface, thereby increasing the roughness of the welding surface. And the rough area 46 can be made to coincide with the laser welding area S1, for example, the rough area 46 is larger than the laser welding area S1.

[0092] In the above embodiments, since the welding surfaces of the first clamping portion 41 and the second clamping portion 42 have rough areas 46, during the process of welding the clamping member 4 and the pole post 3 by laser welding, the reflection of the laser by the welding surface can be reduced, which is beneficial to improving the welding quality of the clamping member 4 and the pole post 3.

[0093] In some possible embodiments of the present application, the wall thickness T1 of the clamping member 4 is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

[0094] In the embodiments of the present application, the clamping member 4 can be made of a metal material, which facilitates the welding of the clamping member 4 and the pole post 3, and the clamping member 4 and the tab 21. And the clamping member 4 can be made of a relatively thin sheet metal.

[0095] Exemplarily, the clamping member 4 can be made of the same material as the pole post 3. For example, the clamping member 4 can be made of aluminum, copper or an alloy. In this way, better welding effects can be obtained when welding the clamping member 4 and the pole post 3.

[0096] In another example, the clamping member 4 can be made of a sheet metal with a thickness greater than or equal to 0.1 mm and less than or equal to 1.5 mm. For example, the clamping member 4 can be processed by blanking and stamping. In this way, the wall thickness T1 of the processed clamping member 4 is less than or equal to 1.5 mm and greater than or equal to 0.1 mm.

[0097] It should be noted that the wall thickness T1 of the clamping member 4 can be measured at room temperature (such as 25 °C) using a measuring tool such as a vernier caliper.

[0098] In the above embodiments, since the wall thickness T1 of the clamping member 4 is less than or equal to 1.5 mm and greater than or equal to 0.1 mm, this can not only make the clamping member 4 have a smaller weight, which is beneficial to reducing the overall weight of the battery cell 120, but also meet the welding requirements between the tab 21 and the clamping member 4, and between the clamping member 4 and the pole post 3.

[0099] In some possible embodiments of the present application, the housing 1 includes a housing body 11 and an end cap 12. The housing body 11 has an opening matching the end cap 12, and the end cap 12 has a through hole matching the pole post 3; the end cap 12 is sealingly connected to the opening to form a receiving cavity, and the pole post 3 extends through the through hole from the receiving cavity to the side of the end cap 12 away from the receiving cavity.

[0100] In the embodiments of the present application, as Figure 2As shown in the figure, the outer casing 1 includes an end cap 12 and a housing 11. The housing 11 is provided with an opening that matches the end cap 12, and the end cap 12 closes the opening to form a receiving cavity for accommodating substances such as the electrode assembly 2 and the electrolyte. For example, the housing 11 may be provided with one or more openings. The end cap 12 may also be provided with one or more. The end cap 12 and the opening on the housing 11 can be hermetically connected by welding or bonding.

[0101] Exemplarily, the shapes of the housing 11 and the end cap 12 can be set according to the shape of the electrode assembly 2 in the battery cell 120. For example, the housing 11 can be set as a cylindrical shape, and the end cap 12 can be set as a disc shape; or the housing 11 can be set as a square tube shape, and the end cap 12 can be set as a square disc shape. In this way, a cylindrical battery cell or a square-shell battery cell can be obtained.

[0102] In another example, a through hole that matches the pole post 3 can be provided on the end cap 12, so that the pole post 3 passes through the through hole and is provided on the end cap 12, and the pole post 3 extends to the side of the end cap 12 away from the receiving cavity.

[0103] In the above embodiments, since the outer casing 1 includes the housing 11 and the end cap 12, it is convenient to process the outer casing 1. And the end cap 12 and the housing 11 are hermetically connected, and an outer casing 1 with a sealed receiving cavity can be formed.

[0104] In addition, an embodiment of the present application further provides a battery device 100. Refer to Figure 9 , Figure 9 which is a schematic structural diagram of the battery device provided by the present application Figure 2 . As Figure 6 and Figure 9 shown, the battery device 100 includes: a box body 110 and the battery cell 120 provided in any one of the above embodiments. Among them, the box body 110 has an installation cavity; the battery cell 120 is installed in the installation cavity.

[0105] In an embodiment of the present application, the battery device 100 (Battery Apparatus) may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells 120, and the plurality of battery cells 120 are connected in series, parallel or in a hybrid connection through a bus bar component.

[0106] Exemplarily, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 120. For example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 120 to form an independent module. The battery module can also be formed by bundling a plurality of battery cells 120 with a cable tie.

[0107] In another example, the battery device 100 may be a battery pack, which includes a box body 110 and one or more battery cell assemblies accommodated in the box body 110. For example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 110 by fixing the battery module in the box body 110. Alternatively, the battery cell assembly may also be accommodated in the box body 110 by directly fixing a plurality of battery cells 120 to the box body 110.

[0108] In yet another example, the battery device 100 refers to an energy storage device, which includes a box body 110, and a door is provided on at least one side of the box body 110. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0109] In the embodiments of the present application, as Figure 9 shown, the box body 110 may include a first box body 111 and a second box body 112. The first box body 111 and the second box body 112 are buckled so that a closed safety cavity is formed inside the box body 110 to accommodate the battery cell assembly. Here, "closed" means covering or closing, which may be sealed or non-sealed. The first box body 111 may be a top cover or a bottom plate.

[0110] Exemplarily, the box body 110 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body 110 to accommodate the battery cell assembly. For example, the box body 110 may be a part of the chassis structure of a vehicle. The top cover of the box body 110 may be at least a part of the floor of the vehicle, or the frame of the box body 110 may be at least a part of the cross beam and longitudinal beam of the vehicle.

[0111] Since the battery device 100 provided in the embodiments of the present application includes the battery cell 120 provided in any one of the above embodiments, the reliability of the connection between the pole 3 and the electrode assembly 2 can be improved, thereby the performance stability of the battery cell 120 can be improved, and further the working stability of the battery device 100 can be enhanced.

[0112] The embodiments of the present application further provide an electrical device. Referring to Figure 10 , Figure 10 is a schematic structural diagram of the electrical device provided by the present application. The electrical device includes the battery cell 120 provided in any one of the above embodiments for providing electric energy or the battery device 100 provided in the above embodiments.

[0113] In the embodiments of the present application, the electrical device is powered by the battery cell 120 or the battery device 100 provided in the above embodiments. For example, the electrical device may be a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0114] In the following embodiments, for the convenience of description, a power consumption device in an embodiment of the present application is taken as an example of a vehicle for illustration. The following will be described with reference to the accompanying drawings.

[0115] As Figure 10 shown, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle. The battery device 100 can be arranged at the bottom, head or tail of the vehicle. The battery device 100 can be used to supply power to the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power consumption requirements during the start, navigation and driving of the vehicle.

[0116] In the embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0117] Since the power consumption device provided in the embodiments of the present application includes the battery cell 120 or the power consumption device provided in the above embodiments, the performance stability of the battery cell 120 can be improved, and further, the working stability and continuity of the power consumption device can be improved.

[0118] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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 covered by the scope of the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that, Comprising: A housing which encloses to form a receiving cavity; An electrode assembly which is installed in the receiving cavity, the electrode assembly includes at least two layers of electrode plates, and tab ears extend from the electrode plates; A terminal post, a part of the terminal post is located at a position corresponding to the tab ear in the receiving cavity, and the other part passes through the housing and extends to the outside of the housing; A clamping member which clamps the tab ear, and one side of the clamping member away from the tab ear is connected to the terminal post to electrically connect the tab ear and the terminal post.

2. The battery cell according to claim 1, wherein The clamping member includes a first clamping portion and a second clamping portion which are connected and satisfy a parallel relationship. A clamping cavity is formed between the first clamping portion and the second clamping portion. The tab ear is fixed in the clamping cavity, and one of the first clamping portion and the second clamping portion is connected to the terminal post.

3. The battery cell according to claim 2, characterized in that, A first folding edge is formed at one end of the first clamping portion away from the second clamping portion, and the first folding edge fits on a side of the first clamping portion away from the clamping cavity; and / or, a second folding edge is formed at one end of the second clamping portion away from the first clamping portion, and the second folding edge fits on a side of the second clamping portion away from the clamping cavity.

4. The battery cell according to claim 3, wherein The tab ear and the clamping member are fixedly connected by ultrasonic welding, and an ultrasonic welding area is formed between the tab ear and the clamping member; the clamping member and the terminal post are fixedly connected by laser welding, and a laser welding area is formed between the clamping member and the terminal post.

5. The battery cell according to claim 4, characterized in that, The orthographic projection of the laser welding area on the ultrasonic welding area is located within the ultrasonic welding area.

6. The battery cell according to claim 5, characterized in that, The area of the ultrasonic welding area is greater than or equal to 1.2 times the area of the laser welding area.

7. The battery cell according to claim 4, characterized in that One of the first folding edge and the second folding edge which abuts against the terminal post has an orthographic projection on the laser welding area that does not overlap with the laser welding area.

8. The battery cell according to claim 4, wherein The welding surface of one of the first clamping portion and the second clamping portion which is fixedly connected to the terminal post and faces the terminal post has a rough area, and the rough area overlaps with the laser welding area, and the rough area is used to increase the roughness of the welding surface.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The wall thickness of the clamping member is greater than or equal to 0.1 mm and less than or equal to 1.5 mm.

10. The battery cell according to any one of claims 1 to 8, characterized in that, The housing includes a shell and an end cap. The shell has an opening matching the end cap, and the end cap has a through hole matching the terminal post; the end cap is sealingly connected to the opening to form the receiving cavity, and the terminal post extends from the receiving cavity through the through hole to the side of the end cap away from the receiving cavity.

11. A battery device, characterized in that, Comprising: A box body which has an installation cavity; The battery cell according to any one of claims 1 to 10, and the battery cell is installed in the installation cavity.

12. An electrical device, characterized in that, The electrical device includes the battery cell according to any one of claims 1 to 10 for providing electrical energy or the battery device according to claim 11.

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