Battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. Each battery monomer comprises a shell, an electrode assembly and a pole; the shell forms an accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the electrode assembly comprises a battery cell as well as a second tab and a first tab which are arranged at the end part of the battery cell; the pole is connected with the shell and is insulated from the shell; wherein the first tab comprises a first negative electrode area and a second negative electrode area, the first negative electrode area is electrically connected with the shell, and the second negative electrode area is overlapped with the end surface of the battery cell; the second tab comprises a first positive electrode area and a second positive electrode area, the first positive electrode area is electrically connected with the pole, and the second positive electrode area is overlapped with the end surface of the battery cell; and the positive electrode first region and the negative electrode first region are positioned at the same end part of the battery cell. According to the invention, the risk of adverse effects caused by welding can be reduced, and the reliability of electric connection in the battery monomers is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] In the related art, the electrical connection in the battery monomer is mostly achieved by means of penetration welding, which is affected by the flatness and surface cleanliness of the welding object, and thus has safety problems such as virtual welding or welding through, thereby resulting in poor reliability of the electrical connection in the battery monomer, and thus needs to be improved. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery monomer, a battery and a power utilization device to improve the reliability of the electrical connection in the battery monomer.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0005] a housing forming a containing cavity;

[0006] an electrode assembly arranged in the containing cavity, the electrode assembly comprising a battery cell and a second tab and a first tab arranged at an end of the battery cell;

[0007] a pole connected to the housing and insulated;

[0008] wherein the first tab comprises a negative first region and a negative second region, the negative first region is electrically connected to the housing, and the negative second region is overlapped with an end surface of the battery cell; the second tab comprises a positive first region and a positive second region, the positive first region is electrically connected to the pole, and the positive second region is overlapped with the end surface of the battery cell; and the positive first region and the negative first region are located at the same end of the battery cell.

[0009] In the above technical solution, by arranging the positive tab and the negative tab as structures having a flattened region and a non-flattened region, the non-flattened region of the positive tab is connected to the pole, and the non-flattened region of the negative tab is connected to the housing, so that the negative end can omit the pole and the adapter sheet and other current collectors, thereby simplifying the multiple welding steps, reducing the risk of adverse effects due to welding, the positive end can reduce the influence of the welding effect caused by the flatness and surface cleanliness of the welding object, thereby improving the welding effect, and thus improving the reliability and safety of the electrical connection of the battery monomer; at the same time, by arranging the negative first region and the positive first region at the same end of the battery cell, the scene requiring same-side electrical connection can be applied.

[0010] In some embodiments, the positive first region and the negative first region are arranged in a circumferential direction.

[0011] In some embodiments, the positive second region and the negative second region are located at different end portions of the battery cell.

[0012] In some embodiments, the positive first region and the positive second region are located at the same end portion of the battery cell, and the positive second region is located at an inner circle relative to the positive first region.

[0013] In some embodiments, the pole post comprises a pole post body and an adapter, the adapter is mounted to the shell and is insulated from the negative first region, the pole post body is electrically connected to the positive first region through the adapter, and the pole post body is arranged at an end of the adapter away from the battery cell.

[0014] In some embodiments, the shell is provided with a positive annular groove at a portion protruding from the battery cell at the first end portion;

[0015] The adapter comprises a first connecting portion and a second connecting portion connected to each other, the first connecting portion is mounted in the positive annular groove, and an end of the second connecting portion away from the first connecting portion extends towards the battery cell and is electrically connected to the positive first region.

[0016] In some embodiments, the shell comprises a first portion and a second portion at a portion protruding from the battery cell at the first end portion, the second portion is located at an end of the shell and is provided with the positive annular groove, and the negative first region is electrically connected to the first portion.

[0017] In some embodiments, the positive first region is connected to at least two wall surfaces of the adapter.

[0018] In some embodiments, the battery cell further comprises a sealing insulating member, at least a portion of the sealing insulating member is located between the pole post and the shell, at least a portion of the sealing insulating member is located between the negative first region and the pole post, and at least a portion of the sealing insulating member is located between the positive first region and the shell.

[0019] In some embodiments, the battery cell further comprises a first sealing member and a second sealing member, the first sealing member and the second sealing member are arranged along an axis of the battery cell, at least a portion of the first sealing member is located between the pole post and the shell, at least a portion of the second sealing member is located between the negative first region and the pole post, and at least a portion of the second sealing member is located between the positive first region and the shell.

[0020] In some embodiments, the negative second region and an end wall of the shell at the second end portion are stacked along an axis of the battery cell.

[0021] In a second aspect, the embodiments of the present application provide a battery, comprising: a plurality of battery cells according to any one of the above embodiments.

[0022] In a third aspect, the embodiments of the present application provide a power utilization device, comprising the battery as described in any of the above embodiments, wherein the battery is configured to provide power for the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 A structural diagram of a vehicle is provided for some embodiments of the present application;

[0025] Figure 2 An exploded view of a battery is provided for some embodiments of the present application;

[0026] Figure 3 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0027] Figure 4 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0028] Figure 5 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0029] Figure 6 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0030] Figure 7 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0031] Figure 8 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0032] Figure 9 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0033] Figure 10 A structural diagram of a battery cell is provided for some embodiments of the present application;

[0034] LIST OF REFERENCE NUMBERS

[0035] Vehicle 1, battery 10, box body 11, first box body 111, second box body 112;

[0036] Battery cell 12, shell 121, accommodating cavity 1211, first part 1212, second part 1213, positive ring groove 12132, negative end wall 1214;

[0037] Electrode assembly 122, battery cell 1221, first tab 1222, negative first area 12221, negative second area 12222, second tab 1223, positive first area 12231, positive second area 12232;

[0038] Pole 123, pole body 1231, adapter 1232, first connecting part 12321, second connecting part 12322;

[0039] Sealing insulation 124, bending segment 1241, first sealing part 1242, second sealing part 1243;

[0040] Motor 20, controller 30, seam weld head 40. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0043] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0047] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells; the embodiments of this application use cylindrical battery cells.

[0048] 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 or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0049] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of 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 electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated positive current collector, serving as the second tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material 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 is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated negative current collector, serving as the first tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple second tabs stacked together, and there are multiple first tabs stacked together.

[0050] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0051] With the gradual popularization of new energy technologies, lithium battery technology has continued to develop. Lithium batteries are favored by the new energy industry because of their excellent characteristics such as large energy storage capacity, stable power supply capacity, and long service life.

[0052] A battery consists of a casing and multiple individual battery cells housed within it. As a core component of new energy vehicles, the battery faces stringent requirements in terms of both safety and cycle life.

[0053] The inventors discovered that in typical battery cells, the electrical connections between the tabs, adapters, and terminals within the battery cell are mostly achieved through-welding. Due to factors such as the flatness and surface cleanliness of the welded object, safety issues such as incomplete welding or burn-through occur, resulting in poor reliability of the electrical connections within the battery cell. Therefore, improvements are needed.

[0054] Based on the above considerations, in order to solve the problem of poor electrical connection reliability within a single battery cell, the inventors, after in-depth research, designed a battery cell including a casing, an electrode assembly, and terminals; the casing forms a receiving cavity; the electrode assembly is disposed within the receiving cavity, and the electrode assembly includes a cell and a second tab and a first tab disposed at the end of the cell; the terminals are connected to the casing and insulated from it; wherein, the first tab includes a negative electrode first region and a negative electrode second region, the negative electrode first region is electrically connected to the casing, and the negative electrode second region is stacked on the end face of the cell; the second tab includes a positive electrode first region and a positive electrode second region, the positive electrode first region is electrically connected to the terminal, and the positive electrode second region is stacked on the end face of the cell; the positive electrode first region and the negative electrode first region are located at the same end of the cell.

[0055] In this battery cell structure, by setting both the positive and negative electrode tabs to have flattened and non-flattened areas, the non-flattened area of ​​the positive electrode tab is connected to the terminal post, and the non-flattened area of ​​the negative electrode tab is connected to the outer casing. The negative terminal can omit current collectors such as terminals and adapter plates, thereby simplifying multiple welding steps and reducing the risk of adverse effects caused by welding. The positive terminal can reduce the influence of factors such as the flatness and surface cleanliness of the welding object on the welding effect, improving the welding effect and thus improving the reliability and safety of the battery cell electrical connection. At the same time, setting the first negative electrode area and the first positive electrode area at the same end of the cell can be used in scenarios that require electrical connection on the same side.

[0056] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application, which helps to improve the reliability of the battery cells.

[0057] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0058] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0059] like Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 20, a controller 30, and a battery 10 can be installed inside vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, the battery 10 can be installed at the bottom, front, or rear of vehicle 1. The battery 10 can be used to power vehicle 1; for example, the battery 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0060] In another embodiment of this application, the battery 10 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.

[0061] To meet different power needs, the battery 10 may include multiple battery cells 12, which may be connected in series, in parallel, or in a mixed manner. Mixed connection refers to a combination of series and parallel connections.

[0062] like Figure 2 The diagram shown is an exploded view of the structure of a battery 10 according to an embodiment of this application. The battery 10 includes a housing 11 and a plurality of battery cells 12, which are housed within the housing 11. The housing 11 provides assembly space for the battery cells 12, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first housing body 111 and a second housing body 112, which overlap each other, and together define an assembly space for accommodating the battery cells 12. The second housing body 112 may be a hollow structure open at one end, and the first housing body 111 may be a plate-like structure, with the first housing body 111 covering the open side of the second housing body 112, so that the first housing body 111 and the second housing body 112 together define the assembly space; alternatively, the first housing body 111 and the second housing body 112 may both be hollow structures open on one side, with the open side of the first housing body 111 covering the open side of the second housing body 112. Of course, the box 11 formed by the first box body 111 and the second box body 112 can be of various shapes, such as a cylinder or a cuboid.

[0063] In battery 10, multiple battery cells 12 can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 12 are connected in both series and parallel. Multiple battery cells 12 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 12 is housed in housing 11. Of course, battery 10 can also be composed of multiple battery cells 12 first connected in series, parallel, or in a mixed manner to form battery 10 modules, and then multiple battery 10 modules are connected in series, parallel, or in a mixed manner to form a whole assembly, which is housed in housing 11.

[0064] A battery cell 12 refers to the smallest unit that makes up a battery 10. A battery cell 12 includes a casing, a cell, and an electrolyte, with the casing used to house the cell and the electrolyte.

[0065] The casing includes a top cover assembly and a housing. The top cover assembly is the component that closes onto the opening of the housing to separate the internal environment of the battery cell from the external environment.

[0066] The top cover assembly includes a top cover and a filter screen. The top cover has an injection hole for injecting electrolyte. The filter screen is installed on the top cover and covers the injection hole. The filter screen is used to filter the injected electrolyte.

[0067] The shape of the top cover can be adapted to the shape of the housing to fit the housing. Optionally, the top cover can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover is not easily deformed when subjected to compression and impact, allowing the battery cell to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the top cover. The electrode terminals can be used to electrically connect with the battery cell for outputting or inputting electrical energy to the battery cell. In some embodiments, the top cover can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. The material of the top cover can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component can also be provided on the inner side of the top cover. The insulating component can be used to isolate the electrical connection components inside the housing from the top cover to reduce the risk of short circuit. For example, the insulating component can be plastic, rubber, etc.

[0068] The housing is a component used to fit the top cover to form the internal environment of a battery cell, wherein the formed internal environment can be used to house the cell, electrolyte, and other components.

[0069] The casing and top cover can be independent components. An opening can be provided on the casing, and the top cover closes the opening to form the internal environment of the battery cell. Alternatively, the top cover and casing can be integrated. Specifically, the top cover and casing can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the casing, the top cover closes the casing. The casing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the casing can be determined according to the specific shape and size of the battery cell. The casing material can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application does not impose any special limitations on this.

[0070] The battery comprises multiple rows of battery cells arranged along a first direction, and each row of battery cells includes multiple battery cells arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the housing, respectively, and are perpendicular to each other.

[0071] Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes. For example, the battery cell is cylindrical.

[0072] According to some embodiments of this application, such as Figure 8 and Figure 9 As shown, this application provides a battery cell 12, including: a housing 121, an electrode assembly 122, and a terminal post 123.

[0073] The outer casing 121 forms a receiving cavity 1211, which is used to receive the electrode assembly 122.

[0074] The electrode assembly 122 is disposed in the receiving cavity 1211. The electrode assembly 122 includes a battery cell 1221 and a first tab 1222 and a second tab 1223 disposed at the ends of the battery cell 1221.

[0075] One of the first electrode tab 1222 and the second electrode tab 1223 is a negative electrode tab, and the other of the first electrode tab 1222 and the second electrode tab 1223 is a positive electrode tab.

[0076] The first tab 1222 and the second tab 1223 can be disposed at opposite ends of the battery cell 1221, or they can be disposed at the same end of the battery cell 1221. Alternatively, a portion of the tab connection portion of the first tab 1222 and a portion of the tab connection portion of the second tab 1223 can be disposed at opposite ends of the battery cell 1221, or they can be disposed at the same end of the battery cell 1221.

[0077] The terminal 123 is connected to and insulated from the housing 121. The terminal 123 can be connected to the housing 121 by plugging or soldering. The terminal 123 and the housing 121 are isolated by an insulating material, such as ceramic, plastic, or rubber, to prevent short circuits between the terminal 123 and the housing 121. One of the terminals 123 and the housing 121 is the negative terminal, and the other of the terminals 123 and the housing 121 is also the negative terminal.

[0078] In this embodiment, the first electrode 1222 can be a negative electrode, and the second electrode 1223 is a positive electrode. The positive electrode is electrically connected to the external circuit through the electrode post 123, and the negative electrode is electrically connected to the external circuit through the outer casing 121.

[0079] Among them, such as Figure 3 As shown, the first electrode tab 1222 includes a negative electrode first region 12221 and a negative electrode second region 12222. The negative electrode first region 12221 can be the non-flattened region of the negative electrode tab, and the negative electrode second region 12222 is the flattened region of the negative electrode tab. The negative electrode first region 12221 is electrically connected to the outer shell 121, and the negative electrode second region 12222 is stacked with the end face of the battery cell 1221. The negative electrode second region 12222 is electrically connected to the battery cell 1221 by flattening.

[0080] The negative electrode first region 12221 can be a multi-turn tab connection part arranged radially along the battery cell.

[0081] like Figure 10 As shown, before the battery cell 1221 is assembled with the casing 121, the tab connection portion of the negative electrode first region 12221 can be in an upright state; as Figure 3 and Figure 5 As shown, before the opening of the outer casing 121 is sealed, the tab connection of the negative electrode first region 12221 and the outer casing 121 have overlapping areas along the radial direction of the battery cell 12. The tab connection of the negative electrode first region 12221 and the outer casing 121 can be connected by a side welding method along the radial direction.

[0082] For example, the tab connection portion of the negative electrode first region 12221 can be electrically connected to the outer casing 121 by welding methods such as ultrasonic roll welding or laser side welding.

[0083] In this embodiment, by stacking the negative electrode second region 12222 with the negative end face of the battery cell 1221, the negative electrode second region 12222 is electrically connected to the battery cell 1221 by flattening, thus optimizing the electrical connection between the negative electrode second region 12222 and the battery cell 1221, as well as between adjacent coil tab connection parts within the negative electrode second region 12222.

[0084] For example, such as Figure 4 As shown, the tabs can be flattened by mechanical flattening or smoothing, and the tabs in the negative electrode second region 12222 at the end of the cell 1221 can be flattened into a plane, so that the tabs of adjacent layers are in close contact and the welding effect is improved.

[0085] In this embodiment, by dividing the negative electrode tab into a first negative electrode region 12221 and a second negative electrode region 12222, the first negative electrode region 12221 can be directly electrically connected to the casing by side welding, eliminating the current collectors such as the terminal post 123 and the adapter piece, thereby simplifying multiple welding steps, reducing the risk of adverse effects caused by welding, and improving the reliability of electrical connections within the battery cell 12; the second negative electrode region 12222 is flattened and stacked with the end face of the cell 1221, optimizing the electrical connection between the second negative electrode region 12222 and the cell 1221, as well as between adjacent tabs within the second negative electrode region 12222, thereby further improving the reliability of electrical connections within the battery cell 12.

[0086] The relative positional relationship between the negative electrode second region 12222 and the negative electrode first region 12221 can be determined based on the arrangement position of the first electrode tab 1222 and the second electrode tab 1223 in the cell 1221 and the shape of the casing.

[0087] For example, the negative electrode second region 12222 can be located in the inner ring relative to the negative electrode first region 12221, so that the negative electrode second region 12222 located in the outer ring can be welded to the outer casing 121; or, the negative electrode second region 12222 and the negative electrode first region 12221 can be distributed relative to each other with the axis of the battery cell 12 as the center of symmetry; or, as Figure 3 As shown, the negative electrode second region 12222 and the negative electrode first region 12221 can be respectively located at both ends of the cell 1221 to reduce the risk of short circuit in the battery cell 12.

[0088] The second electrode 1223 includes a positive first region 12231 and a positive second region 12232. The positive first region 12231 is electrically connected to the electrode post 123. The relative positional relationship between the positive second region 12232 and the positive first region 12231 can be determined according to the arrangement position of the first electrode 1222 and the second electrode 1223 in the cell 1221 and the shape of the casing.

[0089] The first positive electrode region 12231 can be the non-flattened region of the positive electrode tab, and the first positive electrode region 12231 can be a multi-turn tab connection part arranged radially along the battery cell.

[0090] The positive electrode second region 12232 is the flattened region of the positive electrode tab. The positive electrode first region 12231 is electrically connected to the electrode post 123. The positive electrode second region 12232 is stacked with the end face of the battery cell 1221. The positive electrode second region 12232 is electrically connected to the battery cell 1221 by flattening.

[0091] Understandably, due to the thin foil thickness at the edge of the tab, the edge of the tab may be uneven, potentially resulting in flaking and numerous burrs. Therefore, during welding of the tab to the current collector, some areas at the edge of the tab may not make proper contact with the end of the battery cell 1221, leading to unstable welding area. Smoothing or flattening the tab can increase its flatness, improve the welding effect between the flattened area of ​​the tab and the battery cell 1221, and optimize the electrical connection between the flattened area of ​​the tab and the battery cell 1221.

[0092] like Figure 10 As shown, before the battery cell 1221 is assembled with the casing 121, the tab connection portion of the positive electrode first region 12231 can be in an upright state; as Figure 3 and Figure 5 As shown, after the cell 1221 is placed inside the casing 121 and assembled with the terminal post 123, the tab connection part of the positive electrode first region 12231 and the side of the terminal post 123 have an overlapping area along the radial direction of the battery cell 12. The tab connection part of the positive electrode first region 12231 and the side of the terminal post 123 can be connected by side welding in the radial direction.

[0093] In this embodiment, the positive electrode tab is divided into a first positive electrode region 12231 and a second positive electrode region 12232. The first positive electrode region 12231 can be electrically connected to the electrode post 123 by side welding. During the electrical connection process, the influence of factors such as the flatness and surface cleanliness of the welding object on the welding effect can be reduced, thereby improving the reliability of the electrical connection within the battery cell 12. The second positive electrode region 12232 is flattened and stacked with the end face of the cell 1221, which optimizes the electrical connection between the second positive electrode region 12232 and the cell 1221, as well as between adjacent electrode tabs within the second positive electrode region 12232, thereby further improving the reliability of the electrical connection within the battery cell 12.

[0094] For example, such as Figure 4 As shown, the positive electrode second region 12232 can be located in the inner circle relative to the positive electrode first region 12231, so that the positive electrode second region 12232 located in the outer circle can be welded to the electrode post 123; or, the positive electrode second region 12232 and the positive electrode first region 12231 can be distributed relative to each other with the axis of the battery cell 12 as the center of symmetry; or, the positive electrode second region 12232 and the positive electrode first region 12231 can be respectively located at both ends of the cell 1221.

[0095] In this application, the positive electrode first region 12231 and the negative electrode first region 12221 are located at the same end of the cell 1221. In other words, the battery cell 12 of this application has an electrical connection structure in which the positive electrode side and the negative electrode side are located on the same side, so as to be suitable for scenarios that require electrical connection on the same side.

[0096] In this embodiment, the positive electrode first region 12231 and the negative electrode first region 12221 are insulated from each other. The positive electrode first region 12231 and the negative electrode first region 12221 can be insulated from each other by spacing or by providing an insulating component.

[0097] The first electrode 1222 and the second electrode 1223 have at least the following structural forms:

[0098] Firstly, such as Figure 8 As shown, the negative electrode first region 12221, the positive electrode first region 12231, and the positive electrode second region 12232 can be located at the same end of the cell 1221.

[0099] In this embodiment, the negative electrode first region 12221 and the negative electrode second region 12222 are respectively disposed at different ends of the battery cell 1221, thereby increasing the overlapping area of ​​the negative electrode second region 12222 and the battery cell 1221, increasing the welding wire length, and optimizing the electrical connection between the negative electrode second region 12222 and the battery cell 1221.

[0100] The negative electrode second region 12222 can be flattened or smoothed to increase the overlapping area of ​​the negative electrode second region 12222 and the negative terminal of the cell 1221.

[0101] The negative electrode second region 12222 and the positive electrode second region 12232 are located at different ends of the cell 1221, which can avoid the risk of short circuit when the negative electrode second region 12222 and the positive electrode second region 12232 are connected.

[0102] The negative electrode first region 12221 and the positive electrode first region 12231 are located at the same end of the cell 1221 to accommodate scenarios requiring electrical connection on the same side.

[0103] Secondly, the negative electrode first region 12221, the positive electrode first region 12231 and the negative electrode second region 12222 can be located at the same end of the cell 1221.

[0104] In this embodiment, the first positive electrode region 12231 and the second positive electrode region 12232 are respectively disposed at different ends of the battery cell 1221, thereby increasing the overlapping area of ​​the second positive electrode region 12232 and the battery cell 1221, increasing the welding wire length, and optimizing the electrical connection between the second positive electrode region 12232 and the battery cell 1221.

[0105] The negative electrode second region 12222 and the positive electrode second region 12232 are located at different ends of the cell 1221, which can avoid the risk of short circuit when the negative electrode second region 12222 and the positive electrode second region 12232 are connected.

[0106] The negative electrode first region 12221 and the positive electrode first region 12231 are located at the same end of the cell 1221 to accommodate scenarios requiring electrical connection on the same side.

[0107] Thirdly, such as Figure 9 As shown, the negative electrode first region 12221, the negative electrode second region 12222, the positive electrode first region 12231, and the positive electrode second region 12232 can be located at the same end of the cell 1221.

[0108] In this embodiment, the first tab 1222 and the second tab 1223 are located at the same end of the cell 1221. The first tab 1222 and the second tab 1223 need to be insulated from each other. The first tab 1222 and the second tab 1223 can be insulated from each other by spacing or by using an insulating member.

[0109] In related technologies, electrical connections within battery cells are mostly achieved through welding. In particular, cylindrical battery cells require the tabs to be flattened to achieve electrical welding connections with the adapter plates. Due to factors such as the flatness and surface cleanliness of the welding object, the welding gap between the adapter plate and the flattened tab layer can easily lead to weld penetration and burning of the separator, resulting in poor safety and welding efficiency.

[0110] The battery cell 12 provided in this application embodiment has a structure with both positive and negative electrode tabs having flattened and non-flattened areas. The non-flattened area of ​​the positive electrode tab is connected to the terminal post 123, and the non-flattened area of ​​the negative electrode tab is connected to the outer casing 121. The negative terminal can omit the terminal post 123 and the current collector such as the adapter piece, thereby simplifying multiple welding steps and reducing the risk of adverse effects caused by welding. The positive terminal can reduce the influence of factors such as the flatness and surface cleanliness of the welding object on the welding effect, improve the welding effect, and thus improve the reliability and safety of the electrical connection of the battery cell 12. At the same time, the negative first region 12221 and the positive first region 12231 are set at the same end of the cell 1221, which can be applied to scenarios that require electrical connection on the same side.

[0111] According to some embodiments of this application, such as Figure 10 As shown, the positive electrode first region 12231 and the negative electrode first region 12221 are arranged circumferentially.

[0112] In this embodiment, the battery cell 12 is cylindrical, and the positive electrode first region 12231 and the negative electrode first region 12221 extend circumferentially, which can increase the extension length of the positive electrode first region 12231 and the negative electrode first region 12221 and increase the weldable area; at the same time, the positive electrode first region 12231 and the negative electrode first region 12221 are spaced apart, which can achieve insulation between the positive electrode first region 12231 and the negative electrode first region 12221.

[0113] According to some embodiments of this application, such as Figure 6 As shown, the first positive electrode region 12231 and the second positive electrode region 12232 are located at the same end of the cell 1221, and the second positive electrode region 12232 is located in the inner circle relative to the first positive electrode region 12231.

[0114] The relative positional relationship between the positive electrode second region 12232 and the positive electrode first region 12231 can be determined based on the arrangement position of the first tab 1222 and the second tab 1223 in the cell 1221 and the shape of the casing.

[0115] In this embodiment, with the first tab 1222 and the second tab 1223 respectively located at both ends of the cell 1221, the positive electrode second region 12232 can be located in the inner ring relative to the positive electrode first region 12231, so that the positive electrode second region 12232 located in the outer ring can be welded to the electrode post 123.

[0116] In this embodiment, the positive electrode second region 12232 can be a tab structure with a portion of its height removed or not removed. The positive electrode second region 12232 is flattened or smoothed to better contact the end of the cell 1221.

[0117] According to some embodiments of this application, such as Figure 10 As shown, the negative electrode first region 12221 is continuously arranged around the axis of the battery cell 12, and the positive electrode first region 12231 is continuously arranged around the axis of the battery cell 12.

[0118] In this embodiment, the battery cell 1221 can be a wound type, and the tab connection portions of the negative electrode first region 12221 and the positive electrode first region 12231 can both be continuous structures that are partially die-cut. The tab connection portions of the negative electrode first region 12221 and the positive electrode first region 12231 can be provided with multiple layers along the winding direction.

[0119] In this embodiment, by providing at least partially continuous negative electrode first region 12221 and positive electrode first region 12231, the negative electrode first region 12221 is connected to the inner wall of the outer casing 121 by side welding or pressing, and the positive electrode first region 12231 is electrically connected to the side wall of the terminal post 123 by side welding or pressing, the uniformity and reliability of the electrical connection between the negative electrode first region 12221 and the outer casing 121, and between the positive electrode first region 12231 and the side wall of the terminal post 123, can be improved, thereby improving the reliability of the battery cell 12.

[0120] According to some embodiments of this application, such as Figure 7 As shown, the electrode post 123 includes an electrode post body 1231 and an adapter 1232. The adapter 1232 is installed on the housing 121 and is insulated from the negative electrode first region 12221. The electrode post body 1231 is electrically connected to the positive electrode first region 12231 through the adapter 1232.

[0121] The adapter 1232 is partially insulated from the negative first region 12221, while the adapter 1232 is electrically connected to the positive first region 12231.

[0122] Since the positive electrode first region 12231 and the negative electrode first region 12221 are located at the same end of the battery cell 1221, the adapter 1232 is insulated from the negative electrode first region 12221 to avoid short circuit. The adapter 1232 and the negative electrode first region 12221 can be separated or insulated by an insulating component.

[0123] Both the adapter 1232 and the electrode body 1231 are insulated from the outer casing 121. The positive electrode first zone 12231 and the adapter 1232 can be electrically connected by welding to achieve effective current transfer. The adapter 1232 and the electrode body 1231 can be electrically connected by welding, snap-fitting or threaded connection.

[0124] The terminal body 1231 is located at the end of the adapter 1232 away from the cell 1221. The terminal body 1231 can act as a positive terminal cap to close the positive terminal opening of the outer casing 121. That is, the terminal body 1231 is spaced apart from the cell 1221 to reserve an explosion-proof gap inside the battery cell 12, thereby improving the reliability and safety of the battery cell 12.

[0125] In some embodiments, after the battery cell 12 is filled with electrolyte, the terminal body 1231 is placed on the adapter 1232 to close the opening of the adapter ring.

[0126] The adapter 1232 can be a ring-shaped hollow structure. The outer wall of the adapter 1232 is sealed and insulated from the outer shell 121. The battery cell 12 can be injected with liquid through the hollow structure of the adapter 1232. After the liquid injection is completed, the electrode body 1231 can be placed on the hollow structure of the adapter 1232 to seal the adapter 1232.

[0127] The electrode body 1231 can be used as the positive electrode of the battery cell 12. The adapter 1232 acts as an electrical connection bridge, allowing the current in the first region 12231 of the positive electrode to be smoothly transmitted to the electrode body 1231 through the adapter 1232. The adapter 1232 can be made of conductive material and needs to have good conductivity and mechanical strength.

[0128] According to some embodiments of this application, such as Figure 8 As shown, the positive electrode first region 12231 is connected to at least two walls of the adapter 1232, which improves the uniformity and stability of current transmission between the positive electrode first region 12231 and the adapter 1232, thereby improving the overall performance of the battery assembly and reducing the axial height of the battery cell 12.

[0129] For example, during assembly, the bottom surface of the adapter 1232 along the axial direction of the battery cell 12 can be pressed onto the positive electrode first region 12231. After the adapter 1232 is installed and fixed, a portion of the tab connection portion of the positive electrode first region 12231 can be bent so that the bent portion of the tab connection portion overlaps with the side wall of the adapter 1232 in the radial direction, so that the bent portion of the tab connection portion can be side-welded to the side wall of the adapter 1232. In other words, the positive electrode first region 12231 can be connected to the bottom surface of the adapter 1232 along the axial direction of the battery cell 12 and the side wall of the adapter 1232.

[0130] For example, the bent portion of the tab connection of the positive electrode first region 12231 can be electrically connected to the side wall of the adapter 1232 by welding methods such as ultrasonic roll welding or laser side welding.

[0131] According to some embodiments of this application, such as Figure 6 As shown, the outer casing 121 has a positive electrode annular groove 12132 at the portion protruding from the battery cell 1221 at the first end; the adapter 1232 includes a first connecting portion 12321 and a second connecting portion 12322 connected together. The first connecting portion 12321 is installed in the positive electrode annular groove 12132, and the end of the second connecting portion 12322 facing away from the first connecting portion 12321 extends toward the battery cell 1221 and is electrically connected to the positive electrode first region 12231.

[0132] The first connecting part 12321 and the second connecting part 12322 can be integrally formed or welded together.

[0133] For example, the first connecting portion 12321 and the second connecting portion 12322 can be bent relative to each other, and the second connecting portion 12322 can extend along the axial direction of the battery cell 12 and be electrically connected to the tab connecting portion of the positive electrode first region 12231.

[0134] The first connecting part 12321 is installed in the positive electrode annular groove 12132, and the first connecting part 12321 and the positive electrode annular groove 12132 are sealed together.

[0135] For example, the positive electrode annular groove 12132 can form a snap-fit ​​structure with the first connecting part 12321 consisting of a first wall, a second wall, and a third wall connected in sequence. The first wall and the third wall are disposed opposite each other on opposite sides of the first connecting part 12321, and the second wall is located on the side of the adapter 1232. In other words, the positive electrode annular groove 12132 forms a three-sided seal for the first connecting part 12321, improving the sealing performance of the battery cell 12. Furthermore, the groove wall of the positive electrode annular groove 12132 located in the first connecting part 12321 facing the cell 1221 can limit the movement of the first connecting part 12321 towards the cell 1221.

[0136] Alternatively, the positive electrode annular groove 12132 can form a first wall and a second wall connected sequentially to the outer edge of the first connecting portion 12321. The first wall can be located on the side of the first connecting portion 12321, and the second wall can be located on the bottom surface of the first connecting portion 12321 facing the cell 1221. The positive electrode annular groove 12132 forms a double-sided seal for the first connecting portion 12321, increasing the sealing performance of the battery cell 12. Furthermore, the groove wall of the positive electrode annular groove 12132 located in the first connecting portion 12321 facing the cell 1221 can limit the movement of the first connecting portion 12321 towards the cell 1221.

[0137] The positive electrode annular groove 12132 can be formed by roller groove upsetting, so that the size of the sealing surface can be more easily controlled within the specifications.

[0138] In actual processing, the first roller groove forms a stepped surface, that is, the outer shell 121 forms a boss that is concave inward around the axis of the battery cell 12 in the part that extends beyond the cell 1221. The boss can be used to support the first connecting part 12321, thereby restricting the first connecting part 12321 from moving toward the cell 1221, and improving the structural stability and reliability of the battery cell 12.

[0139] Then, the first connecting part 12321 is installed on the step surface. The outer shell 121 is bent beyond the first connecting part 12321 to seal it. The bending angle of this part is increased to seal it a second time. Then, it is pressed down to seal it a third time, thereby forming a positive annular groove 12132 on the outer shell 121, realizing the installation of the outer shell 121 and the first connecting part 12321.

[0140] The first connecting part 12321 is connected to the positive electrode annular groove 12132 in a concave-convex fit, which can effectively reduce the leakage of electrolyte and other substances inside the battery cell 12 to the external environment and improve the sealing performance of the battery. At the same time, the design of the positive electrode annular groove 12132 makes the internal structure of the battery cell 12 more compact and reasonable, which helps to optimize the overall performance and reliability of the battery.

[0141] The first connecting part 12321 and the positive electrode annular groove 12132 can be sealed using various methods. For example, sealing materials such as sealant, sealing rings or sealing gaskets can be used to fill the gap between the first connecting part 12321 and the positive electrode annular groove 12132; in addition, a sealing effect can also be achieved through specific mechanical structures (such as threads or snaps).

[0142] The second connection part 12322 extends from the end opposite to the first connection part 12321 toward the cell 1221 and is electrically connected to the positive electrode first region 12231. This design allows current to be transmitted from the positive electrode first region 12231 to the electrode body 1231 through the adapter 1232, thereby completing the charging and discharging process of the battery.

[0143] The positive electrode first region 12231 is connected to at least two end faces of the second connecting portion 12322, thereby increasing the radial overlap area between the positive electrode first region 12231 and the second connecting portion 12322, thereby increasing the effective flow area during side welding.

[0144] In this embodiment, by configuring the adapter 1232 as a connected first connection portion 12321 and a connected second connection portion 12322, the adapter 1232 is used to achieve effective current transmission and mechanical support in the positive electrode portion of the battery assembly.

[0145] According to some embodiments of this application, such as Figure 8 As shown, the portion of the outer casing 121 that protrudes from the battery cell 1221 at the first end includes a first portion 1212 and a second portion 1213, and the negative electrode first region 12221 is electrically connected to the first portion 1212.

[0146] The first part 1212 and the second part 1213 can be integrally formed or welded structures.

[0147] The first part 1212 and the second part 1213 are arranged along the height direction of the battery cell 12. The second part 1213 is kept at a certain distance from the cell 1221, forming a space that can be used to accommodate some components of the battery cell 12 or as part of an explosion-proof gap. The second part 1213 is located at the end of the housing 121 and is provided with a positive annular groove 12132. The second part 1213 can be used to install the adapter 1232.

[0148] The tab connection of the negative electrode first region 12221 can be electrically connected to the first part 1212 of the outer casing 121 by side welding. This electrical connection can be ultrasonic roll welding, laser side welding or other reliable connection methods performed by the roll welding head 40.

[0149] At least one of the first part 1212 and the second part 1213 may be provided with a bending structure. The bending structure can shorten the height of the battery cell 12 along the axis and at the same time reserve a certain deformation margin for the outer casing 121 so that the outer casing 121 can undergo axial tensile deformation when the cell 1221 is heated and expands or when the gas pressure inside the outer casing 121 is large, thereby reducing the pressure inside the outer casing 121 and improving the safety of the battery cell 12.

[0150] Alternatively, the first part 1212 and the second part 1213 can be bent relative to each other to form a stacked structure, thereby increasing the deformation allowance of the outer shell 121.

[0151] According to some embodiments of this application, when the negative electrode first region 12221 and the negative electrode second region 12222 are located at the same end of the cell 1221, at least a portion of the first part 1212, the negative electrode first region 12221 and the negative electrode second region 12222 are stacked sequentially along the axis of the battery cell 12, and the negative electrode first region 12221 and the negative electrode second region 12222 are close to or in contact with each other.

[0152] It should be noted that after at least a portion of the first part 1212 and the negative electrode first region 12221 are electrically connected by side welding or other means, the portion of the outer casing 121 that protrudes from the cell 1221 at the negative end needs to be sealed by heating, spinning or pressing. During the sealing process, the portion of the outer casing 121 that protrudes from the cell 1221 at the negative end will deform toward the axis of the battery cell 12, and the first part 1212 and the negative electrode first region 12221 will be bent and deformed to be close to or in contact with the negative electrode second region 12222.

[0153] In this embodiment, at least a portion of the first part 1212, the first negative electrode region 12221, and the second negative electrode region 12222 are stacked sequentially along the axis of the battery cell 12. This layout makes the internal structure of the battery cell 12 more compact, improves space utilization, and also helps to improve the safety and reliability of the battery cell 12.

[0154] According to some embodiments of this application, such as Figure 3 As shown, when the negative electrode first region 12221 and the negative electrode second region 12222 are located at different ends of the cell 1221, the negative electrode second region 12222 is stacked with the negative electrode end wall 1214 of the casing 121 to shorten the axial length of the battery cell 12.

[0155] According to some embodiments of this application, the battery cell 12 further includes a sealing insulation element 124, which has an insulating and sealing function.

[0156] The insulating seal has at least two of the following configuration methods.

[0157] Firstly, such as Figure 7 and Figure 9 As shown, a sealing and insulating component 124 is provided.

[0158] At least a portion of the sealing insulation component 124 is located between the terminal post 123 and the outer casing 121 to fill the gap between the terminal post 123 and the outer casing 121, so that a seal is formed between the first connecting portion 12321 of the adapter 1232 and the positive annular groove 12132 of the outer casing 121, thereby reducing the leakage of liquid inside the battery cell 12 from the gap between the terminal post 123 and the outer casing 121; at the same time, it insulates the terminal post 123 and the outer casing 121, reducing short circuits and improving the reliability and safety of the battery cell 12.

[0159] At least a portion of the sealing insulation component 124 is located between the negative electrode first region 12221 and the terminal post 123, thereby insulating the negative electrode first region 12221 from the terminal post 123, reducing short circuits, and improving the reliability and safety of the battery cell 12.

[0160] At least a portion of the sealing insulation component 124 is located between the positive electrode first region 12231 and the outer casing 121, thereby insulating the positive electrode first region 12231 from the outer casing 121, reducing short circuits, and improving the reliability and safety of the battery cell 12.

[0161] For example, the sealing insulation component 124 can be a rubber component, a ceramic component, or a polytetrafluoroethylene component, etc.

[0162] According to some embodiments of this application, the sealing insulation member 124 includes a bent section 1241 located between the first connection portion 12321 and the end face of the cell 1221.

[0163] The sealing insulation component 124 includes a sealing section and a bending section. The sealing section is installed between the first connecting part 12321 and the end face of the cell 1221 facing the first part 1212. The sealing section is used to seal between the adapter 1232 and the positive annular groove 12132 of the outer casing 121. The bending section is located outside the positive annular groove 12132. One end of the bending section can be connected to the sealing section, and the end of the bending section away from the sealing section extends toward the cell 1221.

[0164] By incorporating a bending section, the length of the sealing insulation component 124 can be extended. The connection area between different components within the battery cell 12 may have irregular shapes or spatial limitations. The bending section 1241 can flexibly conform to these complex shapes, enabling the sealing insulation component 124 to be effectively installed and positioned. Simultaneously, during the operation of the battery cell 12, due to changes in factors such as temperature and pressure, the components within the battery cell 12 may undergo slight movements or deformations. The design of the bending section 1241 can absorb these changes, reduce stress concentration, and thus extend the service life of the sealing insulation component 124.

[0165] For example, the sealing insulation member 124 includes a first segment to a fourth segment connected in sequence. At least a portion of the first segment is located between the groove wall of the positive annular groove 12132 away from the first portion 1212 and the first connecting portion 12321. The second segment is located between the bottom wall of the positive annular groove 12132 and the first connecting portion 12321. The third segment is located between the groove wall of the positive annular groove 12132 near the first portion 1212 and the first connecting portion 12321. The fourth segment is located outside the positive annular groove 12132 and extends toward the cell 1221 to form a bent segment 1241.

[0166] The first to fourth sections can be designed as a single piece.

[0167] The first to third segments are installed between the positive electrode annular groove 12132 and the first connecting part 12321, serving as a seal and insulation between the positive electrode annular groove 12132 and the first connecting part 12321; the fourth segment is located between the first connecting part 12321 and the end face of the cell 1221, which can be used to compensate for the length of the sealing insulation component 124 and limit the displacement of the first connecting part 12321, improve the structural stability and positioning effect of the sealing insulation component 124, and at the same time serve as insulation between the first connecting part 12321 and the negative electrode first area 12221, insulation between the positive electrode first area 12231 and the outer shell 121, and insulation between the second connecting part 12322 and the outer shell 121.

[0168] For example, the bending shape of the first to fourth segments of the sealing insulation member 124 can be manufactured during production; or, the sealing insulation member 124 can be deformed to form the bending shape of the first to fourth segments according to the shape change of the mating surface between the housing 121 and the negative end cap.

[0169] According to some embodiments of this application, the end of the first segment that is away from the second segment is located outside the positive electrode annular groove 12132, and the end of the third segment that is away from the second segment is located outside the positive electrode annular groove 12132.

[0170] The first and third segments have a length allowance. Each segment includes a portion between the positive electrode annular groove 12132 and the first connecting portion 12321, and a portion outside the positive electrode annular groove 12132. This enhances the stability of the sealing insulation component 124 and helps reduce the risk of sealing failure caused by deformation of the sealing insulation component 124 due to vibration or temperature changes during the operation of the battery cell 12. Simultaneously, it simplifies the installation and removal process of the sealing insulation component 124, making it easier for operators to insert it between the positive electrode annular groove 12132 and the first connecting portion 12321 to form an effective seal. Furthermore, due to the length allowance, it can be adjusted according to the specific shape and size of the positive electrode annular groove 12132 to suit different types of batteries, helping to reduce production costs and meet the customized needs of different customers.

[0171] According to some embodiments of this application, the end of the first segment that is away from the second segment is located outside the positive electrode annular groove 12132.

[0172] The first segment has a length margin and includes a portion located between the positive electrode annular groove 12132 and the first connecting portion 12321 and a portion located outside the positive electrode annular groove 12132. This can enhance the stability of the sealing insulation component 124 and help reduce the risk of sealing failure caused by deformation of the sealing insulation component 124 due to vibration or temperature changes generated during the operation of the battery cell 12.

[0173] According to some embodiments of this application, the end of the third segment that is away from the second segment is located outside the positive electrode annular groove 12132.

[0174] The third segment has a length margin and includes a portion located between the positive electrode annular groove 12132 and the first connecting portion 12321 and a portion located outside the positive electrode annular groove 12132. This can enhance the stability of the sealing insulation component 124 and help reduce the risk of sealing failure caused by deformation of the sealing insulation component 124 due to vibration or temperature changes generated during the operation of the battery cell 12.

[0175] Secondly, such as Figure 8As shown, the battery cell 12 also includes a first seal 1242 and a second seal 1243, which are arranged along the axis of the battery cell 12.

[0176] At least a portion of the first seal 1242 is located between the pole post 123 and the outer casing 121. A portion of the first seal 1242 is located between the positive annular groove 12132, the first connecting portion 12321, and a portion of the second connecting portion 12322, serving as insulation and sealing.

[0177] At least a portion of the second seal 1243 is located between the negative electrode first region 12221 and the pole post 123, and at least a portion of the second seal 1243 is located between the positive electrode first region 12231 and the outer casing 121, thus serving as an insulating element.

[0178] For example, the first seal 1242 and the second seal 1243 may be rubber parts, ceramic parts, or polytetrafluoroethylene parts, etc.

[0179] It is understandable that the connection area between different components within the battery cell 12 may have irregular shapes or spatial limitations. The sealing insulation component 124 is a flexible component. When the sealing insulation component 124 is squeezed, it will conform to these complex shapes. If the reserved amount of the sealing insulation component 124 is small, the sealing insulation component 124 will retract from the preset position near the tail end of the cell 1221, resulting in the absence of the sealing insulation component 124 in the area where it should be installed, leading to a short circuit.

[0180] In this embodiment, by setting the sealing insulation member 124 as a separate first sealing member 1242 and second sealing member 1243, even if the portion of the first sealing member 1242 between the outer shell 121 and the adapter 1232 is squeezed and deformed to fit the gap, it will not have a significant impact on the position and shape of the second sealing member 1243, and can still play an insulating role, thereby improving the reliability of the electrical connection within the battery cell 12.

[0181] Both the first sealing element 1242 and the second sealing element 1243 can be sealing ring structures.

[0182] The following describes the battery cell 12 provided in this application using a complete embodiment.

[0183] Firstly, the battery cell 12 includes: a casing 121, an electrode assembly 122, and a terminal post 123. The electrode assembly 122 is disposed in the receiving cavity 1211. The electrode assembly 122 includes a cell 1221 and a first tab 1222 and a second tab 1223 respectively disposed at the end of the cell 1221. The positive and negative electrodes are electrically connected on the same side.

[0184] One side of the negative electrode tab (negative electrode second zone 12222) is flattened and inserted into the shell. The other side of the negative electrode tab (negative electrode first zone 12221) retains only half of the outer ring, and the positive electrode tab also retains half of the inner ring (positive electrode second zone 12232) and is flattened to ensure electrical connection. The outer half of the positive electrode tab (positive electrode first zone 12231) is used to form an electrical connection with the shell 121 through ultrasonic roll welding to serve as the negative electrode. Then, the sealing insulation part 124 and the adapter 1232 are inserted, and the positive electrode second zone 12232 and the adapter 1232 are formed to form an electrical connection through ultrasonic roll welding to serve as the positive electrode. The excess part of the shell 121 is rolled and sealed. After liquid injection, the electrode body 1231 is placed on the adapter 1232 and welded to complete the seal.

[0185] Secondly, the battery cell 12 includes: a casing 121, an electrode assembly 122 and a terminal post 123. The electrode assembly 122 is disposed in the receiving cavity 1211. The electrode assembly 122 includes a cell 1221 and a first tab 1222 and a second tab 1223 respectively disposed at the end of the cell 1221. The positive and negative electrodes are electrically connected on the same side.

[0186] One side of the negative electrode tab (negative electrode second region 12222) is flattened and inserted into the shell. The other side of the negative electrode tab (negative electrode first region 12221) retains only half of the outer ring, and the positive electrode tab also retains half of the inner ring (positive electrode second region 12232) and is flattened to ensure electrical connection. The outer half of the positive electrode tab (positive electrode first region 12231) is used to form an electrical connection with the shell 121 through ultrasonic roll welding to serve as the negative electrode. Then, the second sealing member 1243 is inserted. The second sealing member 1243 can be connected to the negative electrode first region 12221 and the positive electrode first region 12231 through bonding or other means. After inserting the first sealing member 1242 and the adapter 1232, the positive electrode second region 12232 and the adapter 1232 are connected to form an electrical connection through ultrasonic roll welding to serve as the positive electrode. The excess part of the shell 121 is rolled and sealed. After liquid injection, the electrode body 1231 is placed on the adapter 1232 and welded to complete the seal.

[0187] In the two specific embodiments described above, the sealing and insulating component 124 has a different structure, but both can achieve a good sealing and insulating effect and improve the reliability of the internal electrical connection of the battery cell 12.

[0188] According to some embodiments of this application, this application also provides a battery, including: a plurality of battery cells 12 as described in any of the embodiments above.

[0189] The battery provided in this application embodiment can achieve the effects of the battery cell 12 described above by using the battery cell 12 in any of the above embodiments, thereby improving the reliability and safety of the battery.

[0190] According to some embodiments of this application, this application also provides an electrical device, including: a battery as described in the above embodiments, the battery being used to provide electrical energy to the electrical device.

[0191] The electrical device can be any of the aforementioned battery-powered equipment or systems.

[0192] The electrical device provided in this application embodiment can achieve the effects of the battery described above by using the battery in any of the above embodiments, thereby improving the reliability and safety of the electrical device.

[0193] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0194] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell forms a receiving cavity; An electrode assembly is disposed within the receiving cavity, the electrode assembly comprising a battery cell and a second electrode tab and a first electrode tab disposed at the end of the battery cell; The pole is connected to and insulated from the outer casing; The first electrode includes a first negative electrode region and a second negative electrode region. The first negative electrode region is electrically connected to the outer casing, and the second negative electrode region is stacked on the end face of the battery cell. The second electrode includes a first positive electrode region and a second positive electrode region. The first positive electrode region is electrically connected to the electrode post, and the second positive electrode region is stacked on the end face of the battery cell. The first positive electrode region and the first negative electrode region are located at the same end of the battery cell.

2. The battery cell according to claim 1, characterized in that, The positive electrode first region and the negative electrode first region are arranged circumferentially apart.

3. The battery cell according to claim 1 or 2, characterized in that, The positive electrode second region and the negative electrode second region are located at different ends of the battery cell.

4. The battery cell according to any one of claims 1-3, characterized in that, The first positive electrode region and the second positive electrode region are located at the same end of the battery cell, and the second positive electrode region is located in the inner circle relative to the first positive electrode region.

5. The battery cell according to any one of claims 1-4, characterized in that, The electrode post includes an electrode post body and an adapter. The adapter is installed on the outer casing and is insulated from the negative electrode first region. The electrode post body is electrically connected to the positive electrode first region through the adapter. The electrode post body is located at the end of the adapter that is away from the battery cell.

6. The battery cell according to claim 5, characterized in that, The outer casing has a positive annular groove at the portion of the first end that protrudes from the battery cell. The adapter includes a first connecting part and a second connecting part connected together. The first connecting part is installed in the positive electrode annular groove, and the end of the second connecting part opposite to the first connecting part extends toward the battery cell and is electrically connected to the positive electrode first region.

7. The battery cell according to claim 6, characterized in that, The portion of the outer casing that protrudes from the battery cell at the first end includes a first part and a second part. The second part is located at the end of the outer casing and is provided with the positive annular groove. The negative first region is electrically connected to the first part.

8. The battery cell according to claim 5 or 6, characterized in that, The positive electrode first region is connected to at least two walls of the adapter.

9. The battery cell according to any one of claims 1-8, characterized in that, The battery cell further includes a sealing insulation component, at least a portion of which is located between the terminal post and the outer casing, at least a portion of which is located between the negative electrode first region and the terminal post, and at least a portion of which is located between the positive electrode first region and the outer casing.

10. The battery cell according to any one of claims 1-8, characterized in that, The battery cell further includes a first seal and a second seal, which are arranged along the axis of the battery cell. At least a portion of the first seal is located between the terminal post and the outer casing. At least a portion of the second seal is located between the negative electrode first region and the terminal post, and at least a portion is located between the positive electrode first region and the outer casing.

11. The battery cell according to any one of claims 1-10, characterized in that, The negative electrode second region and the end wall of the outer casing at the second end are stacked along the axis of the battery cell.

12. A battery, characterized in that, include: Multiple battery cells as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, include: The battery of claim 12 is used to provide electrical energy to the electrical device.

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