Battery cell, battery, and electric device

Abstract

The application relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode lead-out piece and an electrode assembly. The electrode lead-out piece is arranged on the shell. The electrode assembly is accommodated in the shell and comprises a plurality of ear groups with the same polarity. Each ear group comprises at least one ear. Each ear group is arranged in a stacking mode along the thickness direction of the ear. The plurality of ear groups are formed with a thinning part. The electrode lead-out piece is connected with the thinning part. The battery monomer, the battery and the power utilization device provided by the application are aimed at reducing the probability of false welding of the battery monomer in production.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and rechargeable alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, besides improving the performance of individual battery cells, reducing the probability of thermal runaway is also a crucial issue. If the probability of thermal runaway cannot be controlled, the battery cell becomes unusable. Therefore, reducing the probability of thermal runaway in individual battery cells is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device that have better overcurrent capacity and can reduce the occurrence of poor soldering.

[0005] In a first aspect, this application proposes a battery cell, which includes a housing, an electrode lead-out member, and an electrode assembly. The electrode lead-out member is disposed in the housing. The electrode assembly is housed within the housing and includes multiple tab groups with the same polarity. Each tab group includes at least one tab. The tab groups are stacked along the thickness direction of the tabs. The multiple tab groups have a thinning portion. The electrode lead-out member is connected to the thinning portion.

[0006] According to the embodiments of this application, the battery cell is configured with an electrode assembly including multiple tabs of the same polarity, and each tab is stacked along the thickness direction of the tab. The multiple tabs have thinned portions, and the electrode leads are connected to the thinned portions. This configuration reduces the difficulty of connecting the tabs and the electrode leads by reducing the thickness of the tabs at the positions corresponding to the thinned portions. When the tabs and the electrode leads are connected by welding, the thinner thinned portions can improve the welding quality, reduce the occurrence of incomplete welds, and thus improve the reliability of the battery cell.

[0007] According to one embodiment of the first aspect of this application, adjacent tab groups are staggered to form a thinning portion at at least one end of the plurality of tab groups.

[0008] According to the battery cell of this application embodiment, by setting adjacent tab groups to be staggered, it is equivalent to spreading multiple tab groups stacked along the thickness direction in a direction perpendicular to the thickness direction, so that the entire tab part forms a structure with decreasing thickness in the thinning part, thereby improving the connection performance between the tab and the electrode lead; at the same time, the staggered arrangement of adjacent tab groups also ensures that each tab group has at least a part of its structure directly connected to the electrode lead, resulting in better connection reliability.

[0009] According to an embodiment of the first aspect of this application, the number of electrodes in each electrode group is N, and N satisfies: 1≤N≤5.

[0010] According to the battery cell of the present application embodiment, the value of N satisfies: 1≤N≤5. By limiting the number of tabs in each tab group, the thickness of the tab group is controlled. When the tabs and electrode leads are connected by welding, the thickness caused by too many tabs in the tab group can be reduced, thereby improving the welding effect between each tab group and the electrode lead and reducing the probability of poor welding.

[0011] According to an embodiment of the first aspect of this application, the electrode lead-out is connected to the thinning portion to form a connecting portion, and the connecting portion is simultaneously connected to multiple tab groups.

[0012] According to the embodiments of this application, the battery cell is connected to the electrode lead and the thinning part to form a connection part, and the connection part is simultaneously connected to multiple electrode tabs to increase the connection area between the electrode assembly and the electrode lead, thereby improving the overcurrent effect of the electrode assembly and making it more reliable.

[0013] According to an embodiment of the first aspect of this application, the connecting portion includes a plurality of first segments and second segments, the plurality of first segments being arranged in parallel at intervals and connected end to end by a plurality of second segments; the arrangement direction of the plurality of first segments is parallel to the misalignment arrangement direction of the plurality of tabs.

[0014] According to the embodiments of this application, when the battery cell is connected to the electrode lead by welding, multiple first segments are connected end to end by multiple second segments, which helps to improve the continuity of welding and further improve the production efficiency of the battery cell. At the same time, the setting direction of the multiple first segments is parallel to the staggered setting direction of the multiple electrode groups, which makes welding control easier and realizes the effect of contact and welding between the electrode lead and each electrode group, thereby further improving the production efficiency.

[0015] According to an embodiment of the first aspect of this application, the connecting portion includes a plurality of first segments and second segments, the plurality of first segments being arranged in parallel at intervals and connected end to end by a plurality of second segments; the arrangement direction of the plurality of first segments is perpendicular to the misalignment arrangement direction of the plurality of tabs.

[0016] According to the embodiments of this application, when the battery cell is connected to the electrode leads by welding, multiple first segments are connected end to end by multiple second segments, which helps to improve the continuity of welding and further improve the production efficiency of the battery cell. At the same time, the setting direction of the multiple first segments is perpendicular to the staggered setting direction of the multiple electrode leads, which can increase the welding area and welding strength of the electrode leads and electrode leads in the first segment, resulting in better current flow effect.

[0017] According to one embodiment of the first aspect of this application, along the staggered arrangement direction of the plurality of tab groups, a first segment is arranged corresponding to a tab group.

[0018] According to the battery cell of the present application embodiment, a first segment is provided corresponding to a tab group to further increase the connection area and connection strength between the electrode lead and each tab group, thereby further improving the overcurrent capacity.

[0019] According to an embodiment of the first aspect of this application, the number of electrodes in each electrode group is N, and N satisfies: 5 < N ≤ 10; the electrode groups and the electrode leads are connected by ultrasonic welding.

[0020] According to the battery cell of this application embodiment, when N satisfies: 5<N≤10, the tab group and the electrode lead are connected by ultrasonic welding. That is, the tab group with a large number of tabs and the electrode lead are welded by ultrasonic welding, which can improve the welding performance between the tab group and the electrode lead, thereby improving the welding effect and reducing the probability of cold solder joints.

[0021] According to one embodiment of the first aspect of this application, a plurality of tab assemblies are staggered along a first direction and / or a second direction, the second direction intersecting the first direction and perpendicular to the thickness direction of the tab.

[0022] According to the embodiments of this application, in a single battery cell, multiple tabs are staggered along a first direction and / or a second direction, making the staggered arrangement of the tabs more flexible, applicable to different situations of the battery cell, with a wider range of applications and better reliability.

[0023] According to an embodiment of the first aspect of this application, the housing includes an end cap and an insulating member, the end cap being provided with electrode terminals; the insulating member is connected to the side of the end cap near the electrode assembly; an electrode lead is connected to the electrode terminals, and at least a portion of each tab assembly is disposed between the electrode lead and the insulating member.

[0024] According to the embodiments of this application, by disposing at least a portion of each tab group between the electrode lead and the insulating member, the connection position between the tab and the electrode lead is changed. By disposing the connection position between the electrode lead and the insulating member, the bending and re-insertion after the tab is damaged can be reduced, thereby further improving the reliability and safety performance of the battery cell.

[0025] According to an embodiment of the first aspect of this application, the electrode lead includes a first welding area and a second welding area; the first welding area is connected to the tab assembly, and the second welding area is connected to the electrode terminal.

[0026] According to the embodiments of this application, the battery cell is divided into a first welding area and a second welding area by dividing the electrode lead-out part into a first welding area and a second welding area, and the electrode tab group and the electrode terminal are connected by the first welding area and the second welding area respectively, so that the structure of the battery cell is simpler and more reasonable, and the production efficiency of the battery cell is further improved.

[0027] The orthographic projection of the first welding area onto the end cover overlaps with the orthographic projection of the multiple tab assemblies onto the end cover, and the orthographic projection of the second welding area onto the end cover overlaps with the electrode terminals; the first welding area and the second welding area are offset in the direction from the electrode assembly to the end cover.

[0028] According to the embodiments of this application, the battery cell is configured such that the orthographic projection of the first welding area onto the end cover overlaps with the orthographic projection of the multiple tabs onto the end cover, and the orthographic projection of the second welding area onto the end cover overlaps with the electrode terminals. The first welding area and the second welding area are staggered in the direction from the electrode assembly to the end cover. That is, the first welding area is used to connect the tabs and the second welding area is used to connect the electrode terminals. This configuration can further improve the accuracy of the connection, thereby improving the connection performance between the electrode leads and the multiple tabs, as well as between the electrode leads and the electrode terminals, so as to further improve the reliability of the battery cell.

[0029] Secondly, this application proposes a battery comprising a battery cell as provided in any embodiment of the first aspect of this application.

[0030] Thirdly, this application proposes an electrical device that includes a battery as provided in any embodiment of the second aspect of this application, the battery being used to provide electrical energy. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0032] Figure 1 This is a partial structural schematic diagram of a vehicle according to an embodiment of this application;

[0033] Figure 2 This is an exploded structural diagram of a battery according to an embodiment of this application;

[0034] Figure 3This is a three-dimensional structural diagram of a battery cell provided in the first aspect embodiment of this application;

[0035] Figure 4 yes Figure 3 An enlarged view of part A in the shown battery cell;

[0036] Figure 5 This is a schematic diagram of an embodiment of a battery cell with a tab assembly including one tab, provided in the first aspect of this application.

[0037] Figure 6 This is a schematic diagram of an embodiment of a battery cell with three tabs provided in the first aspect of this application;

[0038] Figure 7 This is a schematic diagram of a welding method between the electrode lead-out and multiple tabs in a battery cell provided in the first aspect embodiment of this application;

[0039] Figure 8 This is a schematic diagram of another welding method between the electrode lead-out and multiple tabs in a battery cell provided in the first aspect embodiment of this application;

[0040] Figure 9 This is a schematic diagram of another welding method between the electrode lead-out and multiple tabs in a battery cell provided in the first aspect embodiment of this application;

[0041] Figure 10 This is a schematic diagram of another welding method between the electrode lead-out component and multiple tabs in a battery cell provided in the first aspect embodiment of this application;

[0042] Figure 11 This is a schematic diagram of an embodiment of a battery cell with six tabs provided in the first aspect of this application;

[0043] Figure 12 This is a schematic diagram of the electrode leads and multiple tabs in a battery cell provided in the first aspect of the present application being welded by ultrasonic welding.

[0044] The accompanying drawings are not necessarily drawn to scale.

[0045] In the figure, the reference numerals are as follows: 1, vehicle; 1000, battery; 1a, motor; 1b, controller; 200, housing; 100, battery cell; 10, outer casing; 11, end cap; 12, insulating component; 20, electrode lead-out component; 21, first welding area; 22, second welding area; 30, electrode assembly; 31, tab assembly; 311, tab; 101, connecting part; 1011, first section; 1012, second section; 102, thinning part; X, first direction; Y, second direction. Detailed Implementation

[0046] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0048] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0049] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a lithium-sodium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this application does not limit the specific type. The battery cell may be cylindrical, flat, cuboid, or other shapes, and this application does not limit the specific shape either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this application does not limit the specific type either.

[0050] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a current-collecting portion and a tab protruding from it. The current-collecting portion is coated with the positive active material layer, while at least a portion of the tab is not coated with the active material layer. Taking a lithium-ion battery cell as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection portion and a negative electrode tab protruding from the negative current collection portion. The negative current collection portion is coated with the negative active material layer, and at least a portion of the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0051] The battery cell may also include a housing with an internal cavity that serves as a sealed space for the electrode assembly and electrolyte. The housing includes a shell and an end cap assembly. The shell is a hollow structure with an opening on one side, and the end cap assembly includes an end cap that closes onto the opening of the shell to form a sealed connection, thereby creating the cavity for accommodating the electrode assembly and electrolyte.

[0052] The inventors discovered that as the market demands higher energy density and current carrying capacity from battery cells, related technologies are increasingly employing methods such as increasing the strength of the electrode substrate and the number of electrode stacking layers to achieve better energy density and current carrying capacity. However, this leads to problems during the battery cell manufacturing process, particularly in the connection between the tabs and electrode leads, where insufficient connection strength or even connection failure can occur. For example, in welding connections between the tabs and electrode leads, incomplete soldering is prone to occur, and increasing the holding time and power can cause some tabs to burst, affecting the reliability and safety of the battery cell.

[0053] In view of this, the inventors provide a technical solution in which a battery cell includes a casing, electrode leads, and an electrode assembly. The electrode leads are disposed in the casing; the electrode assembly is housed within the casing and includes multiple tab groups with the same polarity. Each tab group includes at least one tab, and the tab groups are stacked along the thickness direction of the tabs. The multiple tab groups have thinned portions, and the electrode leads are connected to the thinned portions. With this structure, in the connection process between the tabs and the electrode leads, the thickness of the tabs can be reduced at positions corresponding to the thinned portions, thereby reducing the difficulty of connecting the tabs and the electrode leads. When the tabs and electrode leads are connected by welding, the thinner thinned portions improve the welding quality, reduce the occurrence of incomplete welds, and thus improve the reliability of the battery cell.

[0054] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and vehicles using batteries.

[0056] The devices to which the batteries described in this application are applicable include, but are not limited to, electric vehicles, ships, spacecraft, electric toys, and power tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0057] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0058] Figure 1 This is a partial structural schematic diagram of a vehicle according to an embodiment of this application.

[0059] like Figure 1 As shown, a battery 1000 is installed inside the vehicle 1. The battery 1000 can be located at the bottom, front, or rear of the vehicle 1. The battery 1000 can be used to power the vehicle 1; for example, the battery 1000 can serve as the operating power source for the vehicle 1.

[0060] Vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery 1000 to supply power to the motor 1a, for example, for the power needs of vehicle 1 during startup, navigation and driving.

[0061] In some embodiments of this application, the battery 1000 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0062] Figure 2 This is an exploded structural diagram of a battery according to an embodiment of this application.

[0063] like Figure 2 As shown, the battery 1000 includes a battery cell 100. The battery 1000 may also include a housing 200 for accommodating the battery cell 100.

[0064] In battery 1000, there can be one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration and then housed in a housing. Alternatively, multiple battery cells 100 can first be connected in series, parallel, or in a mixed configuration to form a battery module. Multiple battery modules can then be connected in series, parallel, or in a mixed configuration to form a whole and housed in a housing 200.

[0065] Figure 3 This is a three-dimensional structural diagram of a battery cell provided in the first aspect embodiment of this application; Figure 4 yes Figure 3 An enlarged view of part A in the shown battery cell; Figure 5 This is a schematic diagram of an embodiment of a battery cell including a tab assembly with one tab, provided in the first aspect of this application.

[0066] like Figures 3 to 5 As shown in the embodiment of this application, a battery cell 100 is proposed. The battery cell 100 includes a housing 10, an electrode lead 20, and an electrode assembly 30. The electrode lead 20 is disposed in the housing 10. The electrode assembly 30 is housed in the housing 10 and includes a plurality of tab groups 31 with the same polarity. Each tab group 31 includes at least one tab 311. Each tab group 31 is stacked along the thickness direction of the tab 311. The plurality of tab groups 31 form a thinning portion 102. The electrode lead 20 is connected to the thinning portion 102.

[0067] The housing 10 serves to provide a stable and sealed environment for housing the electrode lead-out 20, the electrode assembly 30, and the electrolyte, so that the electrode assembly 30 can be stably charged and discharged within the housing 10.

[0068] The electrode lead-out component 20 is used to connect the electrode assembly 30 to the outside world so as to transport electrical energy to the external electrical device during the discharge process of the electrode assembly 30; and to connect to the external power supply equipment during the charging process of the electrode assembly.

[0069] In these embodiments of the present application, the electrode lead-out member 20 can be an adapter piece or an external electrode tab. In some embodiments, the electrode lead-out member 20 can also be directly part of the electrode tab, or it can be regarded as the battery cell 100 not having an electrode lead-out member 20. In this case, the electrode tab can be directly set on the outer casing to achieve charging and discharging with the outside world. The choice can be made according to the actual situation.

[0070] The electrode assembly 30 is the component in the battery cell 100 that actually performs charging and discharging. In some embodiments, the electrode assembly 30 may be configured as a stacked structure, that is, the positive electrode and the negative electrode are stacked alternately along the thickness direction, and the separator is disposed between adjacent positive electrode and negative electrode; in some embodiments, the electrode assembly 30 may also be configured as a wound structure, which is formed by winding the positive electrode, the negative electrode, and the separator that are stacked alternately along the thickness direction on the basis of the stacked structure.

[0071] The electrode lead 20 is disposed on the housing 10, meaning that at least a portion of the electrode lead 20 is connected to the housing 10 and electrically connected to the outside through the housing 10. Exemplarily, in some embodiments, the housing 10 is provided with electrode terminals, one end of which communicates with the internal space of the housing 10 and the other end with the external space. In this case, at least a portion of the electrode lead 20 can be configured to connect to the electrode terminals within the internal space of the housing 10.

[0072] The electrode assembly 30 is housed within the housing 10, meaning that the electrode assembly 30 is housed within the receiving cavity of the housing 10 and immersed in the electrolyte, which is also housed within the receiving cavity. With this arrangement, during the charging or discharging process of the battery cell 100, electrons can pass through the electrolyte and the separator, freely moving between the positive and negative electrode plates, thereby enabling the charging or discharging of the battery cell 100.

[0073] The electrode assembly 30 includes multiple tab groups 31 with the same polarity. Each tab group 31 is stacked along the thickness direction of the tab 311. This means that at the positive tab of the electrode assembly 30, a unit number of positive tabs are stacked along the thickness direction to form a tab group 31, and at multiple positive tabs, multiple tab groups 31 are stacked along the thickness direction of a single positive tab. Correspondingly, at the negative tab of the electrode assembly 30, a unit number of negative tabs are stacked along the thickness direction to form a tab group 31, and at multiple negative tabs, multiple tab groups 31 are stacked along the thickness direction of a single negative tab.

[0074] It should be noted that in a single tab group 31, it is necessary to ensure that the projections of a unit number of tabs 311 along the thickness direction remain basically overlapping.

[0075] Each tab group 31 includes at least one tab 311, meaning that the aforementioned unit quantity is at least one. In these embodiments of the present application, by setting the tab group 31 to include at least one tab 311 and limiting the welding to the electrode lead 20 on a unit basis with tab group 31, the number of welding positions between multiple tabs 311 and the electrode lead 20 can be reduced, which is beneficial to the centralization of welding positions.

[0076] The formation of a thinning portion 102 in multiple electrode groups 31 means that in an integral electrode formed by stacking multiple electrode groups 31, at least some portions are thinner than others, and the portions with smaller thickness are designated as thinning portions 102.

[0077] For example, a possible implementation of forming the thinning portion 102 is to perform local thinning treatment on at least a portion of the tabs 311 in each tab group 31 so that the thickness is correspondingly reduced after the multiple tabs 311 are stacked to form the tab group 31; in some embodiments, the multiple tab groups 31 may also be staggered along a direction perpendicular to the stacking direction of the multiple tab groups 31 so that a thinning portion 102 with decreasing thickness is formed in the overall tab formed by stacking the multiple tab groups 31.

[0078] The connection method between the tab assembly 31 and the electrode lead-out piece 20 can be welding, plugging, riveting, etc., and can be selected according to the actual situation.

[0079] In these embodiments of the present application, the welding method between each tab assembly 31 and the electrode lead 20 can be laser welding, ultrasonic welding, etc.

[0080] According to the embodiments of this application, the battery cell 100 includes multiple tab groups 31 with the same polarity in the electrode assembly 30. Each tab group 31 is stacked along the thickness direction of the tab 311, and adjacent tab groups 31 are staggered. Each tab group 31 contacts and is welded to the electrode lead 20. This arrangement is equivalent to spreading out multiple tab groups 31 stacked along the thickness direction in a direction perpendicular to the thickness direction, so that at least a part of each tab group 31 can directly contact the electrode lead 20. In the welding process between the tab group 31 and the electrode lead 20, each tab group 31 has at least a part of its structure that can be directly welded to the electrode lead 20, which improves the welding quality, reduces the occurrence of false welds, and thus improves the safety performance of the battery cell 100.

[0081] According to one embodiment of the first aspect of this application, adjacent tab groups 31 are staggered to form a thinning portion 102 at at least one end of the plurality of tab groups 31.

[0082] The misalignment of adjacent tab groups 31 refers to the fact that, along the stacking direction of the tab groups 31, adjacent tab groups 31 are misaligned in a direction perpendicular to the stacking direction, meaning that at least one edge of each tab group 31 is misaligned. For example, at multiple positive tabs, multiple positive tab groups are misaligned in a direction perpendicular to the stacking direction; at multiple negative tabs, multiple negative tab groups are misaligned in a direction perpendicular to the stacking direction.

[0083] It should be noted that in these embodiments of this application, adjacent tab groups 31 are staggered, and it is necessary to control each tab group 31 to contact and weld with the electrode lead 20. That is, each tab group 31 is staggered so that at least a part of the structure of each tab group 31 can be exposed in the direction pointing to the electrode lead 20. In the subsequent welding process, each tab group 31 has at least a part in direct contact with the electrode lead 20 and is directly welded to the electrode lead 20 during welding.

[0084] According to the battery cell 100 of this application embodiment, by setting adjacent tab groups 31 in a staggered manner, it is equivalent to spreading out multiple tab groups 31 stacked along the thickness direction in a direction perpendicular to the thickness direction, so that the entire tab portion forms a structure with decreasing thickness in the thinning portion 102, thereby improving the connection performance between the tab and the electrode lead 20; at the same time, the staggered arrangement of adjacent tab groups 31 also ensures that each tab group 31 has at least a part of its structure directly connected to the electrode lead 20, resulting in better connection reliability.

[0085] According to an embodiment of the first aspect of this application, the housing 10 includes an end cap 11 and an insulating member 12. The end cap 11 is provided with electrode terminals. The insulating member 12 is connected to the side of the end cap 11 near the electrode assembly 30. The electrode lead-out member 20 is connected to the electrode terminals, and at least a portion of each tab assembly 31 is disposed between the electrode lead-out member 20 and the insulating member 12.

[0086] The housing 10 includes an end cap 11 and an insulating member 12. In a possible embodiment, the housing 10 also includes a shell that assembles with the end cap 11, and the end cap 11 and the shell can be connected to form a sealed receiving cavity, in which the electrode assembly 30, the electrode lead-out member 20 and the insulating member 12 are received.

[0087] In some embodiments, the insulating member 12 may be provided as the lower plastic of the battery cell 100, that is, the insulating member 12 is connected to the side of the end cap 11 near the electrode assembly 30, so as to insulate each electrode of the electrode assembly 30 from the end cap 11.

[0088] The end cap 11 is provided with electrode terminals. One end of the electrode terminal is located inside the receiving cavity and connected to the electrode lead-out member 20, while the other end is located outside the receiving cavity and is used to connect to external charging or discharging devices. Generally, the electrode terminals include a positive electrode terminal and a negative electrode terminal. The positive electrode terminal is connected to the portion of the electrode lead-out member 20 that is welded to the positive electrode tab, and the negative electrode terminal is connected to the portion of the electrode lead-out member 20 that is welded to the negative electrode tab.

[0089] The electrode lead 20 is connected to the electrode terminal. In a possible implementation, the insulating member 12 is provided with a clearance structure at the connection between the electrode lead 20 and the electrode terminal, so that the electrode lead 20 can pass through the clearance structure and connect to the electrode terminal.

[0090] At least a portion of each tab group 31 is disposed between the electrode lead 20 and the insulating member 12, that is, at least a portion of the structure of the tab group 31 is sandwiched between the electrode lead 20 and the insulating member 12. With this arrangement, since the electrode lead 20 is disposed on the side of the tab group 31 close to the multiple electrodes of the electrode assembly 30, the electrode lead 20 can be used to limit the tabs 311 in the tab group 31, so that even if welding failure occurs, they cannot be bent into the multiple electrodes of the electrode assembly 30. This reduces the probability of short circuit of the electrode assembly 30 caused by tab bending, and improves reliability and safety.

[0091] According to the embodiments of this application, the battery cell 100, by disposing at least a portion of each tab group 31 between the electrode lead 20 and the insulating member 12, changes the connection position between the tab 311 and the electrode lead 20. By disposing this connection position between the electrode lead 20 and the insulating member 12, the bending and re-insertion of the tab 311 after damage can be reduced, further improving the reliability and safety performance of the battery cell 100.

[0092] According to an embodiment of the first aspect of this application, the electrode lead-out member 20 includes a first welding area 21 and a second welding area 22; the first welding area 21 is connected to the tab assembly 31, and the second welding area 22 is connected to the electrode terminal.

[0093] The first welding area 21 is connected to the tab assembly 31, and the second welding area 22 is connected to the electrode terminal. In a possible implementation, the first welding area 21 is welded and fixed to the tab assembly 31, and the second welding area 22 is welded and fixed to the electrode terminal.

[0094] The first welding area 21 and the second welding area 22 can be an integral structure. In some embodiments, the first welding area 21 and the second welding area 22 can also be set as two separate components. In this case, a connector can be provided between the first welding area 21 and the second welding area 22 to make the first welding area 21 and the second welding area 22 electrically connected.

[0095] According to the embodiments of this application, the battery cell 100 is divided into a first welding area 21 and a second welding area 22 by dividing the electrode lead-out member 20 into a first welding area 21 and a second welding area 22, and the electrode tab group 31 and the electrode terminal are connected by the first welding area 21 and the second welding area 22 respectively, so that the structure of the battery cell 100 is simpler and more reasonable, and the production efficiency of the battery cell 100 is further improved.

[0096] According to an embodiment of the first aspect of this application, the orthographic projection of the first welding area 21 onto the end cover 11 overlaps with the orthographic projection of the plurality of tab assemblies 31 onto the end cover 11, and the orthographic projection of the second welding area 22 onto the end cover 11 overlaps with the electrode terminals; the first welding area 21 and the second welding area 22 are offset in the direction from the electrode assembly 30 to the end cover 11.

[0097] The orthographic projection of the first welding area 21 onto the end cap 11 overlaps with the orthographic projection of the multiple electrode groups 31 onto the end cap 11, so as to facilitate the welding of the multiple electrode groups 31 to the electrode lead-out member 20.

[0098] The projection of the second welding area 22 onto the end cap 11 overlaps with the electrode terminal to facilitate welding of the electrode terminal to the electrode lead 20. This arrangement allows multiple tab assemblies 31 to be connected to the electrode terminal through the first welding area 21 and the second welding area 22.

[0099] The first welding area 21 and the second welding area 22 are staggered in the direction from the electrode assembly 30 to the end cap 11, meaning that the first welding area 21 and the second welding area 22 do not overlap in this direction. This arrangement allows for a more refined structure of the electrode lead 20, reduces the possibility of welding position errors, and thus improves the accuracy of the electrode lead 20 connection.

[0100] According to the embodiments of this application, the battery cell 100 is configured such that the orthographic projection of the first welding area 21 onto the end cover 11 overlaps with the orthographic projection of the plurality of tabs 31 onto the end cover 11, and the orthographic projection of the second welding area 22 onto the end cover 11 overlaps with the electrode terminals. The first welding area 21 and the second welding area 22 are staggered in the direction from the electrode assembly 30 to the end cover 11. That is, the first welding area 21 is used to connect the tabs 31, and the second welding area 22 is used to connect the electrode terminals. This configuration can further improve the accuracy of the connection, thereby improving the connection performance between the electrode lead-out member 20 and the plurality of tabs 31, as well as between the electrode lead-out member 20 and the electrode terminals, so as to further improve the reliability of the battery cell 100.

[0101] Figure 6 This is a schematic diagram of an embodiment of a battery cell with three tabs provided in the first aspect of this application.

[0102] like Figures 3 to 6 As shown, according to an embodiment of the first aspect of this application, the number of electrodes in each electrode group is N, and N satisfies: 1≤N≤5.

[0103] N represents the aforementioned number of units. In these embodiments of this application, N satisfies: 1≤N≤5, meaning that in a single electrode group 31, the number of electrodes 311 is 1 to 5.

[0104] For example, in some embodiments, the value of N can be set to 3. In this way, by limiting the number of tabs 311 in each tab group 31 to a small number, laser welding can be used to weld each tab group 31 to the electrode lead 20 in subsequent welding processes.

[0105] According to the battery cell of this application embodiment, the value of N satisfies: 1≤N≤5. By limiting the number of tabs 311 in each tab group 31, the thickness of the tab group 31 is controlled. When the tabs and the electrode lead 20 are connected by welding, the excessive thickness caused by too many tabs 311 in the tab group 31 can be reduced, thereby improving the welding effect between each tab group 31 and the electrode lead 20 and reducing the probability of poor welding.

[0106] Figure 7This is a schematic diagram of a welding method between the electrode lead-out component and multiple tabs in a battery cell provided in the first aspect embodiment of this application; Figure 8 This is a schematic diagram of another welding method between the electrode lead-out and multiple tabs in a battery cell provided in the first aspect embodiment of this application; Figure 9 This is a schematic diagram of another welding method between the electrode lead-out component and multiple tabs in a battery cell provided in the first aspect embodiment of this application; Figure 10 This is a schematic diagram of another welding method between the electrode lead-out component and multiple tabs in a battery cell provided in the first aspect embodiment of this application.

[0107] like Figures 3 to 10 As shown, according to an embodiment of the first aspect of this application, the electrode lead-out member 20 is connected to the thinning portion 102 to form a connecting portion 101, and the connecting portion 101 is simultaneously connected to a plurality of tab groups 31.

[0108] The connecting portion 101 is the part where the electrode lead-out 20 and the thinning portion 102 are actually welded. In the embodiment where the electrode lead-out 20 and the thinning portion 102 are laser welded, the connecting portion 101 is a weld mark formed between the electrode lead-out 20 and the plurality of tabs 31.

[0109] The connection portion 101 is simultaneously welded to multiple tab groups 31, which means that at least a portion of the electrode lead-out member 20 is in direct contact with multiple tab groups 31. During the welding process, at least a portion of the connection portion 101 is directly welded to at least a portion of multiple tab groups 31.

[0110] According to the embodiments of this application, the battery cell 100 is provided with an electrode lead 20 connected to a thinning portion 102 to form a connection portion 101, and the connection portion 101 is simultaneously connected to multiple tab groups 31, so as to increase the welding area between the electrode assembly 30 and the electrode lead 20, thereby improving the current flow effect of the electrode assembly 30 and making it more reliable.

[0111] According to an embodiment of the first aspect of this application, the connecting portion 101 includes a plurality of first segments 1011 and second segments 1012. The plurality of first segments 1011 are arranged in parallel at intervals and are connected end to end by a plurality of second segments 1012. The arrangement direction of the plurality of first segments 1011 is parallel to the misalignment arrangement direction of the plurality of tab assemblies 31.

[0112] In these embodiments of the present application, the multiple tab assemblies 31 and the electrode leads 20 are welded by laser welding, which can improve welding efficiency and form a continuous connection 101.

[0113] The connecting portion 101 includes multiple first segments 1011 and second segments 1012. The multiple first segments 1011 are arranged in parallel and spaced apart, and are connected end to end by multiple second segments 1012. In a possible implementation, during laser welding, after the electrode lead-out member 20 is pressed against the multiple tab assemblies 31, the laser emitting head of the laser welding unit performs continuous welding operations on the connection point to form the shape of the aforementioned connecting portion 101. This improves the continuity of the welding process, thereby increasing the production efficiency of the battery cell 100.

[0114] The second segment 1012 can be regarded as the turning and changing part of the first segment 1011. The welding and fastening of the electrode lead-out part 20 and the multiple electrode tabs 31 are mainly achieved by the first segment 1011.

[0115] The multiple first segments 1011 are set in a direction parallel to the staggered setting direction of the multiple tab groups 31. This setting method is relatively simple, and there is no need to consider the amount of exposure of each tab group 31 in the staggered setting direction. The first segment 1011 can be set along the staggered setting direction to realize the welding of the connecting part 101 to each tab group 31, so as to further improve the welding efficiency.

[0116] According to the battery cell 100 of this application embodiment, when the tabs and electrode leads 20 are connected by welding, multiple first segments 1011 are connected end to end by multiple second segments 1012, which helps to improve the continuity of welding and further improve the production efficiency of the battery cell 100. At the same time, the setting direction of the multiple first segments 1011 is parallel to the staggered setting direction of the multiple tab groups 31, which makes welding control easier and realizes the effect of contact and welding between the electrode leads 20 and each tab group 31, thereby further improving the production efficiency.

[0117] According to an embodiment of the first aspect of this application, the connecting portion 101 includes a plurality of first segments 1011 and second segments 1012. The plurality of first segments 1011 are arranged in parallel and spaced apart, and are connected end to end by a plurality of second segments 1012. The arrangement direction of the plurality of first segments 1011 is perpendicular to the staggered arrangement direction of the plurality of tabs 31.

[0118] In these embodiments of this application, the arrangement direction of the plurality of first segments 1011 is perpendicular to the staggered direction of the plurality of tab groups 31. This arrangement can be regarded as the arrangement direction of the plurality of first segments 1011 being parallel to the exposed portion of the plurality of tab groups 31, thereby allowing the first segments 1011 to be arranged in more portions of the tab groups 31, thus increasing the welding area between the electrode lead 20 and each tab group 31, and effectively increasing the current carrying capacity of the battery cell 100.

[0119] According to the battery cell 100 of this application embodiment, when the tabs and electrode leads 20 are connected by welding, multiple first segments 1011 are connected end to end by multiple second segments 1012, which helps to improve the continuity of welding and further improve the production efficiency of the battery cell 100. At the same time, the setting direction of the multiple first segments 1011 is perpendicular to the staggered setting direction of the multiple tab groups 31, which can increase the welding area and welding strength of the electrode leads 20 and the tab groups 31 in the first segment 1011, and has a better current flow effect.

[0120] According to one embodiment of the first aspect of this application, along the staggered arrangement direction of the plurality of tab groups 31, a first segment 1011 is correspondingly arranged with a tab group 31.

[0121] Along the staggered arrangement direction of multiple tab groups 31, a first segment 1011 is correspondingly arranged with one tab group 31. A possible implementation is that, before the welding process begins, the advance trajectory of the laser welding head is set so that the exposed portions of a first segment 1011 and a tab group 31 in the staggered arrangement direction overlap. This arrangement can further increase the welding area and welding strength between the electrode lead-out 20 and each tab group 31, further improving the current carrying capacity.

[0122] According to the battery cell 100 of the present application embodiment, a first segment 1011 is correspondingly provided with a tab group 31 to further increase the welding area and welding strength between the electrode lead 20 and each tab group 31, thereby further improving the current carrying capacity.

[0123] Figure 11 This is a schematic diagram of an embodiment of a battery cell with six tabs provided in the first aspect of this application; Figure 12 This is a schematic diagram of the electrode leads and multiple tabs in a battery cell provided in the first aspect embodiment of this application, which are ultrasonically welded together.

[0124] like Figures 3 to 12 As shown, according to an embodiment of the first aspect of this application, the number of electrodes 311 in each electrode group 31 is N, and N satisfies: 5 < N ≤ 10; the electrode group 31 and the electrode lead-out member 20 are connected by ultrasonic welding.

[0125] In these embodiments of this application, N is set to satisfy: 5 < N ≤ 10, that is, in a single tab group 31, the number of tabs 311 is 6 to 10. As a result, the thickness of a single tab group 311 is relatively large. If laser welding is continued, the excessive thickness of the tab group 311 may lead to problems such as incomplete welding or even weld cracking.

[0126] Therefore, in these embodiments of the present application, welding is performed using ultrasonic welding, which has a better welding effect, to reduce the possibility of incomplete welding.

[0127] It should be noted that, since this application requires the electrode assembly 311 to be misaligned, multiple electrode assemblies 31 form inclined surfaces along the misalignment direction. Therefore, in these embodiments of this application, the fixture for ultrasonic welding can also be improved.

[0128] According to the battery cell 100 of the present application embodiment, when N satisfies: 5<N≤10, the tab group 31 and the electrode lead 20 are connected by ultrasonic welding. That is, the tab group 31 with a large number of tabs 311 and the electrode lead 20 are welded by ultrasonic welding, which can improve the welding performance between the tab group 31 and the electrode lead 20, thereby improving the welding effect and reducing the probability of cold solder joints.

[0129] According to one embodiment of the first aspect of this application, a plurality of tab groups 31 are staggered along a first direction X and / or a second direction Y, wherein the second direction Y intersects the first direction X and is perpendicular to the thickness direction of the tab 311.

[0130] Both the first direction X and the second direction Y can be the offset setting direction of the tab group 31. In these embodiments of this application, the first direction X and the second direction Y intersect and are perpendicular to the thickness direction of the tab 311, that is, the plane formed by the first direction X and the second direction Y is perpendicular to the thickness direction of the tab 311.

[0131] Multiple electrode groups 31 are staggered along a first direction X and / or a second direction Y. Possible implementations include multiple electrode groups 31 being staggered along the first direction X, multiple electrode groups 31 being staggered along the second direction Y, or multiple electrode groups 31 being simultaneously arranged along both the first direction X and the second direction Y.

[0132] According to the battery cell 100 of the present application embodiment, a plurality of tab groups 31 are staggered along the first direction X and / or the second direction Y, so that the staggered arrangement of the tab groups 31 is more flexible, applicable to different situations of the battery cell, with a wider range of applications and better reliability.

[0133] Embodiments of this application also propose a battery comprising a battery cell 100 as provided in any embodiment of the first aspect of this application.

[0134] Embodiments of this application also provide an electrical device comprising a battery as provided in any embodiment of the second aspect of this application, the battery being used to provide electrical energy.

[0135] According to a specific embodiment of this application, such as Figures 1 to 12As shown in the embodiment of this application, a battery cell 100 is proposed. The battery cell 100 includes a housing 10, an electrode lead 20, and an electrode assembly 30. The electrode lead 20 is disposed in the housing 10. The electrode assembly 30 is housed in the housing 10 and includes a plurality of tab groups 31 with the same polarity. Each tab group 31 includes at least one tab 311. Each tab group 31 is stacked along the thickness direction of the tab 311. The plurality of tab groups 31 form a thinning portion 102. The electrode lead 20 is connected to the thinning portion 102.

[0136] In these embodiments of the present application, adjacent tab groups 31 are staggered to form a thinning portion 102 at at least one end of the plurality of tab groups 31.

[0137] In these embodiments of the present application, the number of electrodes 311 in a single electrode group 31 is set to three, and the electrode group 31 and the electrode lead-out member 20 are welded by laser welding.

[0138] The electrode lead-out member 20 is welded to multiple electrode tabs 31 to form a connection part 101, and the connection part 101 is simultaneously connected to multiple electrode tabs 31.

[0139] The connecting portion 101 includes a plurality of first segments 1011 and second segments 1012. The plurality of first segments 1011 are arranged in parallel at intervals and are connected end to end by a plurality of second segments 1012. The arrangement direction of the plurality of first segments 1011 is parallel to the staggered arrangement direction of the plurality of tab assemblies 31. This improves welding efficiency and forms a continuous connecting portion 101.

[0140] In these embodiments of this application, multiple tab groups 31 are staggered along the first direction X and the second direction Y. This further increases the contact area between each tab group 31 and the electrode lead-out member 20, thereby further improving the overcurrent effect and enhancing reliability and safety.

[0141] Based on the battery cell provided in the embodiments of this application, the inventors have provided two sets of comparative examples and four sets of specific embodiments to verify the effect of misaligning multiple sets of tabs 31.

[0142] In the aforementioned comparative examples and embodiments, the inventors mixed the negative electrode active material (graphite), thickener (CMC), conductive agent (SP), and binder (SBR) at a certain mass ratio until homogeneous, then added deionized water as a solvent, and stirred under vacuum until the system was homogeneous to obtain a negative electrode active slurry. The negative electrode active slurry was directly coated onto a 10µm copper foil and cold-pressed to obtain a negative electrode sheet.

[0143] The positive electrode active material (lithium iron phosphate), conductive agent (SP), and binder (PVDF) are mixed uniformly in a certain mass ratio. Then, NMP is added as a solvent, and the mixture is stirred under vacuum until the system is homogeneous to obtain the positive electrode active slurry. The positive electrode active slurry is directly coated onto different substrates and cold-pressed to obtain the positive electrode sheet.

[0144] The positive electrode, separator, and negative electrode are stacked in sequence, with the separator positioned between the cathode and anode to provide isolation. The electrodes are then wound to form a wound electrode assembly. The electrode assembly is placed in an outer package, infused with electrolyte, and sealed to obtain the battery cell.

[0145] The test method is as follows: For DCR (DC resistance), the standard HPPC (Hybrid Power Pulse Characteristics) procedure is followed, maintaining an ambient temperature of 25°C. The device is charged and discharged at a 0.33C rate for 3cls, and the capacity at the 3rd cl is taken as the standard capacity C0. After charging to 50% SOC, it is discharged at 4C0 for 30s. The voltage difference before and after 1s is recorded. DCR1s = voltage difference / current. The capacity is determined by maintaining an ambient temperature of 25°C and charging and discharging at a 0.33C rate for 3cls, with the capacity at the 3rd cl recorded. The data obtained are shown in the table below.

[0146]

[0147]

[0148] Therefore, it can be seen that, compared with Comparative Example 1, replacing the electrode material with higher-strength stainless steel in Comparative Example 2 resulted in incomplete welds during welding. However, in Examples 1 to 4, by dividing the multiple electrodes into multiple electrode groups and controlling the staggered arrangement of adjacent electrode groups, and ensuring that each electrode group contacts and welds with the electrode lead, in Examples 1 to 4, no incomplete welds occurred. Thus, it is evident that the staggered arrangement of the electrode groups in this application can effectively reduce the occurrence of incomplete welds.

[0149] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing; an electrode lead-out piece arranged in the housing; an electrode assembly accommodated in the housing and comprising a plurality of tab groups with the same polarity, each of the tab groups comprising at least one tab, each of the tab groups being arranged in a stacked manner along the thickness direction of the tab, and a plurality of the tab groups being formed with a thinned portion, the electrode lead-out piece being connected to the thinned portion; the electrode lead-out piece is connected to the thinned portion and forms a connecting portion, the connecting portion being connected to a plurality of the tab groups at the same time, the connecting portion comprising a plurality of first segments and second segments, a plurality of the first segments being arranged in parallel and spaced apart, and being connected head to tail through a plurality of the second segments.

2. The battery cell of claim 1, wherein, adjacent tab groups are arranged in a staggered manner to form the thinned portion at at least one end of a plurality of the tab groups.

3. The battery cell of claim 2, wherein, the number of the tabs in each of the tab groups is N, and N satisfies: 1≤N≤5.

4. The battery cell according to claim 1, wherein the arrangement direction of a plurality of the first segments is parallel to the staggered arrangement direction of a plurality of the tab groups.

5. The battery cell of claim 1, wherein, the arrangement direction of a plurality of the first segments is perpendicular to the staggered arrangement direction of a plurality of the tab groups.

6. The battery cell of claim 5, wherein, one of the first segments is arranged corresponding to one of the tab groups along the staggered arrangement direction of a plurality of the tab groups.

7. The battery cell of claim 2, wherein, the number of the tabs in each of the tab groups is N, and N satisfies: 5<N≤10; the tab groups and the electrode lead-out piece are connected by ultrasonic welding.

8. The battery cell of any one of claims 1 to 7, wherein, a plurality of the tab groups are arranged in a staggered manner along a first direction and / or a second direction, the second direction intersecting the first direction and being perpendicular to the thickness direction of the tab.

9. The battery cell of claim 1, wherein the housing The battery cell comprises: an end cover provided with an electrode terminal; an insulating piece connected to the end cover close to the electrode assembly; the electrode lead-out piece is connected to the electrode terminal, and at least part of each of the tab groups is arranged between the electrode lead-out piece and the insulating piece.

10. The battery cell of claim 9, wherein, the electrode lead-out piece comprises a first welding area and a second welding area; the first welding area is connected to the tab groups, and the second welding area is connected to the electrode terminal.

11. The battery cell of claim 10, wherein, the orthogonal projection of the first welding area on the end cover overlaps the orthogonal projection of a plurality of the tab groups on the end cover, and the orthogonal projection of the second welding area on the end cover overlaps the electrode terminal; the first welding area and the second welding area are arranged in a staggered manner in the direction from the electrode assembly to the end cover.

12. A battery, characterized by The battery comprises the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized by The battery according to claim 12 is used to provide electric energy.

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