Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of battery production, and provides a single battery, a battery device and a power utilization device.The single battery comprises a shell, an electrode assembly, an electrode terminal and an adapter, and the shell is provided with a containing cavity; the electrode assembly is accommodated in the accommodating cavity, and the electrode assembly is provided with a tab; the electrode terminals are connected to the shell, and the electrode terminals and the tabs are arranged at intervals in the first direction; the adapter comprises a first adapter part and a second adapter part which are connected with each other, in the second direction, the first adapter part is opposite to and electrically connected with the tab, and the second adapter part is opposite to and electrically connected with the electrode terminal; along the second direction, the first switching part is provided with a first sub-part which is arranged opposite to the tab and is electrically connected with the tab, and the thickness of the first sub-part is smaller than that of other parts on the first switching part; the second direction is perpendicular to the first direction. The utility model aims to improve the over-current capability of the adapter so as to improve the performance of the battery monomer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] The adapter is a component inside the battery monomer for establishing electrical connection between the electrode terminal and the tab, and the adapter can smoothly conduct the current generated by the electrochemical reaction inside the battery monomer to the outside of the battery monomer, or smoothly enter the external current into the inside of the battery monomer, so as to realize the charging and discharging function of the battery monomer.

[0003] The overcurrent capacity of the adapter refers to the maximum current value that the adapter can safely pass under certain conditions. The overcurrent capacity of the adapter is one of the important indicators for measuring the performance of the adapter.

[0004] In the related art, the thickness and the overcurrent capacity of the adapter are often mutually restricted, which limits the overcurrent capacity of the adapter and thus affects the performance of the battery monomer. Practical new type content

[0005] The present application aims to provide a battery monomer, a battery device and a power utilization device, and aims to solve the technical problem of poor overcurrent capacity of the adapter in the battery monomer and affecting the performance of the battery monomer.

[0006] In a first aspect, the present application provides a battery monomer, comprising:

[0007] A housing having a receiving cavity;

[0008] An electrode assembly accommodated in the receiving cavity, the electrode assembly having a tab;

[0009] An electrode terminal connected to the housing, the electrode terminal and the tab being arranged in a first direction;

[0010] An adapter comprising a first adapter part and a second adapter part connected to each other, along a second direction, the first adapter part being opposite to and electrically connected to the tab, and the second adapter part being opposite to and electrically connected to the electrode terminal; along the second direction, the first adapter part has a first sub-part opposite to and electrically connected to the tab, and the thickness of the first sub-part is smaller than the thickness of other parts of the first adapter part; and the second direction is perpendicular to the first direction.

[0011] In the embodiment, the first sub-portion is arranged on the first adapter portion of the adapter, the first sub-portion is connected with the tab, the fixing and electrical connection between the adapter and the tab are realized, the thickness of the first sub-portion is smaller than that of other portions on the first adapter portion, the thickness of the position of the adapter connected with the tab is reduced, the strength of the connection between the adapter and the tab is improved, the stress concentration is reduced, the welding difficulty is reduced, and the welding quality is improved when the welding mode is used; under the premise of the structure design, the thickness of the first adapter portion is greater than the preset thickness, that is, the thickness of the adapter is increased, the flow capacity of the adapter is improved without affecting the welding quality, and the performance of the battery monomer is improved.

[0012] In one of the embodiments, the first adapter portion has a first structure surface facing away from the tab, the first structure surface has a first groove structure, and a groove bottom wall of the first groove structure forms the first sub-portion.

[0013] In the embodiment, the first groove structure is arranged on the first adapter portion, the first sub-portion with reduced thickness is formed, and the first sub-portion meets the welding quality requirement between the tab.

[0014] In one of the embodiments, the first groove structure is provided with a plurality of first groove structures, and the plurality of first groove structures are arranged at intervals on the first structure surface.

[0015] In the embodiment, the plurality of first groove structures are arranged, the influence on the structural strength of the first adapter portion is reduced, the flow area is increased, and the flow strength is improved.

[0016] In one of the embodiments, the first groove structure is provided with two first groove structures, and the two first groove structures are arranged at intervals along a third direction, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0017] In the embodiment, the two first groove structures are arranged along the third direction, each first groove structure is welded with the tab, and the welding strength is improved.

[0018] In one of the embodiments, along the third direction, the two first groove structures penetrate to the edge of the first adapter portion.

[0019] In the embodiment, the first groove structure penetrating to the edge is more convenient to process and manufacture, the processing difficulty is reduced, and the processing quality and precision of the first groove structure are improved.

[0020] In one of the embodiments, the first adapter portion has a first connection surface opposite to the first structure surface, and the first connection surface is a plane and is connected with the tab in a lamination mode.

[0021] In the embodiment, the planar first connecting surface can increase the connecting area with the tab, enhance the fitting degree, and reduce the generation of gaps, thereby facilitating the improvement of the welding quality.

[0022] In one of the embodiments, the tab has a first width in the first direction, and the first sub-portion has a second width, the first width being greater than or equal to the second width.

[0023] In the embodiment, the tab is wider than the first sub-portion, so that the tab can cover the surface of the entire first sub-portion and fit with the first sub-portion, thereby providing sufficient welding area between the tab and the first sub-portion and facilitating the improvement of the welding strength.

[0024] In one of the embodiments, the first sub-portion is welded with the tab by ultrasonic welding.

[0025] In the embodiment, the connection between the tab and the first sub-portion by ultrasonic welding can improve the welding quality, reduce the loss, improve the efficiency, and facilitate the improvement of the performance of the battery monomer.

[0026] In one of the embodiments, the first adapter portion has a first connecting surface facing the tab, the first connecting surface has a second groove structure, and the tab is at least partially accommodated in the second groove structure.

[0027] In the embodiment, the second structure groove is additionally provided, thereby further increasing the thickness of the first adapter portion and improving the flow capacity of the adapter.

[0028] In one of the embodiments, the second adapter portion has a second sub-portion oppositely arranged and electrically connected with the electrode terminal, and the thickness of the second sub-portion is less than the thickness of other parts of the second adapter portion.

[0029] In the embodiment, the second sub-portion is arranged on the second adapter portion of the adapter, the electrical connection between the second sub-portion and the electrode terminal is realized, the fixation and electrical connection between the adapter and the electrode terminal are realized, the thickness of the second sub-portion is less than the thickness of other parts of the second adapter portion, the thickness of the position of the adapter connected with the electrode terminal is thinned, the strength of the connection between the adapter and the electrode terminal is improved, the stress concentration is reduced, the welding difficulty is reduced, and the welding quality is improved when welding is adopted; under the premise of the structure design, the thicknesses of the first adapter portion and the second adapter portion are greater than the preset thickness, that is, the thickness of the adapter is increased, thereby improving the flow capacity of the adapter without affecting the welding quality, and the performance of the battery monomer is improved.

[0030] In one of the embodiments, the side of the second adapter portion away from the electrode terminal has a third groove structure, and the groove bottom wall of the third groove structure forms the second sub-portion.

[0031] In the embodiment, the third groove structure is formed on the second adapter part, thereby forming the second sub-part with reduced thickness, and the second sub-part meets the welding quality requirement with the electrode terminal.

[0032] In one of the embodiments, the second sub-part is welded with the electrode terminal by laser welding.

[0033] In the embodiment, the laser welding can improve the connection strength and welding quality between the second sub-part and the electrode terminal.

[0034] In one of the embodiments, the shell includes a first shell wall, the first shell wall has a first wall part and a second wall part, the first wall part is arranged opposite to the first adapter part, the second wall part is arranged opposite to the second adapter part, the electrode terminal is connected to the second wall part, the first wall part protrudes away from the second wall part in a direction away from the tab, and the tab and the electrode terminal form an overlapping area in the second direction.

[0035] In the embodiment, the first wall part protrudes outward relative to the second wall part, thereby facilitating the increase of the volume of the electrode assembly, and further improving the energy density of the battery monomer.

[0036] In one of the embodiments, the first adapter part and the second adapter part are arranged in a staggered manner, and the first adapter part and the electrode terminal form an overlapping area in the second direction.

[0037] In the embodiment, the first adapter part and the electrode terminal form an overlapping area, thereby facilitating the increase of the volume of the electrode assembly, and further improving the energy density of the battery monomer.

[0038] In one of the embodiments, the thickness of the first adapter part is greater than a preset thickness, and the preset thickness is 1.0 mm.

[0039] In the embodiment, the increase of the thickness of the adapter part can improve the flow capacity of the adapter part and improve the structural strength of the adapter part, thereby achieving the purpose of improving the performance of the battery monomer.

[0040] In a second aspect, the application provides a battery device, the battery device comprising the battery monomer according to any one of the above.

[0041] In a third aspect, the application provides a power consumption device, the power consumption device comprising the battery monomer or the battery device according to any one of the above, and the battery device is used for storing or providing electric energy.

[0042] The above description is only a summary of the technical solutions of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application or the prior art will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0044] Figure 1 The structural schematic diagram of a vehicle provided for some embodiments of the present application is shown in the figure.

[0045] Figure 2 The exploded structural schematic diagram of a battery device provided for some embodiments of the present application is shown in the figure.

[0046] Figure 3 The structural schematic diagram of a battery cell provided for some embodiments of the present application is shown in the figure.

[0047] Figure 4 The exploded structural schematic diagram of a battery cell provided for some embodiments of the present application is shown in the figure.

[0048] Figure 5 The top view of the battery cell is shown in the figure. Figure 3

[0049] The sectional view of the battery cell is shown in the figure. Figure 6 Figure 5 The enlarged schematic diagram of the B position in the battery cell is shown in the figure.

[0050] Figure 7 Figure 6 The structural schematic diagram of the adapter in the battery cell provided for some embodiments of the present application is shown in the figure.

[0051] Figure 8 The structural schematic diagram of the adapter in the battery cell provided for some embodiments of the present application is shown in the figure. Figure 1

[0052] Figure 9 The structural schematic diagram of the adapter in the battery cell provided for some embodiments of the present application is shown in the figure. Figure 2

[0053] Figure 10 The structural schematic diagram of the adapter in the battery cell provided for some embodiments of the present application is shown in the figure. Figure 3

[0054] Explanation of reference signs:

[0055] ​​​​​1000, vehicle; 1100, battery device; 1110, case; 1111, first portion; 1112, second portion; 1113, accommodation space; 1120, battery cell; 1121, shell; 11211, accommodation cavity; 11212, cover portion; 11213, housing portion; 11214, first shell wall; 11215, first wall portion; 11216, second wall portion; 1122, electrode assembly; 11221, tab; 1123, electrode terminal; 1124, adapter; 11241, first adapter portion; 112411, first structure surface; 112412, first connection surface; 11242, second adapter portion; 112421, second structure surface; 112422, second connection surface; 11243, first sub-portion; 11244, second sub-portion; 11245, first slot structure; 11246, second slot structure; 11247, third slot structure; 1200, controller; 1300, motor; X, first direction; Y, second direction; Z, third direction; L1, first width; L2, second width. DETAILED DESCRIPTION

[0056] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as embodiments, but cannot limit the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the inclusion not the exclusion of one or more elements.

[0058] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0059] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0061] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0062] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0063] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] The battery cell is the most basic unit that constitutes a battery device or a battery system. The battery cell can directly convert chemical energy into electrical energy and has an independent charging and discharging function.

[0065] In the battery cell, the electrode assembly (also referred to as the battery cell) has a tab, and the tab needs to be connected to the electrode terminal (such as a pole) through an adapter, so as to realize the transmission of current, that is, the adapter is a component inside the battery cell for establishing electrical connection between the electrode terminal and the tab. The adapter can smoothly conduct the current generated by the electrochemical reaction inside the battery cell to the outside of the battery cell, or smoothly enter the external current into the inside of the battery cell, thereby realizing the charging and discharging function of the battery cell.

[0066] The overcurrent capacity of the adapter refers to the maximum current value that the adapter can safely pass under certain conditions. The overcurrent capacity of the adapter is one of the important indicators to measure the performance of the adapter.

[0067] The greater the overcurrent capacity of the adapter, the greater the charging and discharging efficiency of the battery cell can be improved, allowing a larger current to pass through, so that the battery cell can accept a higher charging current during charging, thereby shortening the charging time; during discharging, it can also output a larger current to meet the power demand of high-power devices and improve the charging and discharging performance of the battery. In addition, the greater the overcurrent capacity of the adapter, the greater the stability of the battery system. When the battery cell encounters a situation of instantaneous large current demand during operation, the adapter with greater overcurrent capacity can stably transmit current, avoiding problems such as system voltage fluctuation and device crash caused by poor current transmission, and improving the stability and reliability of the entire battery device or battery system. Furthermore, the greater the overcurrent capacity of the adapter, the lower the heat generation and energy loss. Since it can pass a larger current smoothly, the resistance of the adapter is relatively small. According to Joule's law, when transmitting the same current, less heat is generated, reducing energy loss on the adapter and reducing the overall heat generation of the battery system, which is beneficial to improve the energy efficiency and service life of the battery cell.

[0068] The smaller the overcurrent capacity of the adapter, the smaller the charging and discharging current of the battery cell, which will limit the charging and discharging current of the battery cell, prolong the charging time, and cannot meet the current demand of high-power devices during discharging, resulting in a decline in device performance, such as poor acceleration performance of electric vehicles and shortened cruising range. In addition, the smaller the overcurrent capacity of the adapter, the more likely it will cause overheating. When the actual current passing through the adapter approaches or exceeds its overcurrent capacity, the adapter will generate too much heat due to resistance, causing the temperature to rise. Overheating not only accelerates the aging of the adapter material, reduces its performance and service life, but also may cause internal safety problems of the battery, such as thermal runaway and fire; the smaller overcurrent capacity of the adapter also affects the system reliability. Too small overcurrent capacity may cause the adapter to burn or fuse during operation, causing the electrical connection of the battery system to be interrupted, affecting the normal operation of the entire system, increasing the risk of device failure, and reducing the reliability and stability of the system.

[0069] In related technologies, the structure of the adapter is not reasonably designed, which seriously restricts the overcurrent capacity of the adapter, thereby affecting the performance of the battery cell.

[0070] Specifically, the adapter needs to be conductively connected with the tab, and the commonly used way includes welding, so as to realize the fixing and electrically conductive connection of the adapter and the tab. Since the welding way is adopted, the thickness of the adapter needs to be thinned and cannot be too thick, otherwise, the excessively thick adapter will increase the welding difficulty, reduce the welding strength and produce a large welding deformation, and affect the welding quality. For example, the excessively thick adapter has a large heat capacity, and more heat is needed to reach a suitable welding temperature during welding, which may cause the heat provided by the welding equipment to not be uniformly transmitted to the welding interface of the adapter and the tab, so that the welding part is locally overheated or overcooled, and the welding quality is affected. For another example, the excessively thick adapter needs a larger pressure to tightly fit with the tab, but the excessive pressure may cause the tab to be deformed or even damaged, especially for some thin and soft tab materials such as aluminum tabs, which are more likely to cause this situation, thereby increasing the welding difficulty. For another example, due to the excessively thick adapter, the welding depth may be insufficient during welding, that is, the welding seam cannot fully penetrate the bonding surface of the adapter and the tab, so that there are gaps or incomplete fusion areas in the welding point, thereby reducing the welding strength and causing the adapter and the tab to easily fall off during use. After the excessively thick adapter is welded with the tab, due to the different thermal expansion coefficients of the adapter and the tab, thermal expansion and contraction of different degrees will occur, and the thermal stress is more likely to concentrate at the welding position of the excessively thick adapter and the tab. Under the long-term action, the metal at the welding position will be fatigued, thereby reducing the welding strength and affecting the reliability and service life of the battery monomer.

[0071] It can be seen that the overcurrent capacity of the adapter and the thickness of the adapter are mutually contradictory, mutually restricted and mutually limited, thereby causing the overcurrent capacity of the adapter to be limited, and further affecting the performance of the battery monomer.

[0072] Therefore, the battery monomer provided in the present application is provided, in which a first sub-portion is arranged on a first adapter portion of the adapter, the first sub-portion is connected with the tab, so as to realize the fixing and electrically conductive connection between the adapter and the tab, the thickness of the first sub-portion is smaller than that of other portions on the first adapter portion, so that the thickness of the position of the adapter welded with the tab is thinned, thereby facilitating the improvement of the strength of the adapter connected with the tab, the reduction of stress concentration, the reduction of welding difficulty and the improvement of welding quality when welding is adopted. Under the premise of the structural design, the thicknesses of the first adapter portion and the second adapter portion are greater than the preset thickness, that is, the thickness of the adapter is increased, so that the overcurrent capacity of the adapter can be improved without affecting the welding quality, and further the performance of the battery monomer is improved.

[0073] Specifically, referring to Figures 3-8As shown, the embodiment of the present application provides a battery monomer 1120, which comprises a shell 1121, an electrode assembly 1122, an electrode terminal 1123 and an adapter 1124, wherein the shell 1121 has a containing cavity 11211; the electrode assembly 1122 is contained in the containing cavity 11211, and the electrode assembly 1122 has a tab 11221; the electrode terminal 1123 is connected to the shell 1121, and the electrode terminal 1123 is arranged in the first direction X and spaced apart from the tab 11221; the adapter 1124 comprises a first adapter part 11241 and a second adapter part 11242 connected to each other, and along the second direction Y, the first adapter part 11241 is opposite to and electrically connected to the tab 11221, and the second adapter part 11242 is opposite to and electrically connected to the electrode terminal 1123; along the second direction Y, the first adapter part 11241 has a first subpart 11243 opposite to and electrically connected to the tab 11221, and the thickness of the first subpart 11243 is less than the thickness of other parts of the first adapter part 11241; and the second direction Y is perpendicular to the first direction X.

[0074] The battery monomer 1120 refers to the smallest unit of the battery device 1100. Each battery monomer 1120 can be a secondary battery monomer 1120 or a primary battery monomer 1120; can also be a lithium-sulfur battery monomer 1120, a sodium-ion battery monomer 1120 or a magnesium-ion battery monomer 1120, but is not limited thereto. The battery monomer 1120 can be in the shape of a cylinder, a flat body, a cuboid or other shapes.

[0075] Each battery monomer 1120 comprises one or more electrode assemblies 1122, which can be understood as a bare battery cell in the battery monomer 1120. The electrode assembly 1122 is contained in the containing cavity 11211 of the shell 1121, and the electrode assembly 1122 is electrically connected between the electrode terminal 1123 and the adapter 1124. The electrode assembly 1122 has the tab 11221, which is connected and fixed between the electrode assembly 1122 and the adapter 1124, so as to realize the electrical connection and conduction between the tab 11221 and the adapter 1124. For example, the connection between the tab 11221 and the adapter 1124 is welding, and of course, other connection modes can also be used, such as conductive adhesive connection.

[0076] The shell 1121 can include a cover portion 11212 and a shell portion 11213, the cover portion 11212 and the shell portion 11213 are mutually covered, and the cover portion 11212 and the shell portion 11213 jointly define a containing cavity for containing the electrode assembly 1122. The shell portion 11213 can be a hollow structure with one end open, and the cover portion 11212 can be a plate-shaped structure, the cover portion 11212 covers the open side of the shell portion 11213, so that the cover portion 11212 and the shell portion 11213 jointly define the containing cavity 11211; the cover portion 11212 and the shell portion 11213 can also be hollow structures with one side open, and the open side of the cover portion 11212 covers the open side of the shell portion 11213. Of course, the shell 1121 formed by the cover portion 11212 and the shell portion 11213 can have various shapes, such as a cylinder, a cuboid, etc.

[0077] The electrode terminal 1123 is an important component in the battery monomer 1120, mainly used to realize the electrical connection between the electrode assembly 1122 inside the battery monomer 1120 and the external circuit. The electrode terminal 1123 is usually made of metal materials such as copper, aluminum and their alloys, etc., and has good electrical conductivity. The shape of the electrode terminal 1123 is generally cylindrical or prismatic, one end of the electrode terminal 1123 extends into the inside of the shell 1121 and is electrically connected with the adapter 1124, and the other end extends out of the shell 1121 of the battery monomer 1120, used for connecting the external circuit. On the outside of the electrode terminal 1123, there are usually threads, clamping grooves or wiring terminals, etc., to facilitate connection with external wires or other electrical equipment.

[0078] The electrode terminal 1123 is the channel for the output and input of electric energy of the battery monomer 1120, when the battery monomer 1120 discharges, the current generated inside the battery monomer 1120 is conducted to the external circuit to provide electric energy for the electrical equipment; when charging, the current of the external power source is introduced into the inside of the battery monomer 1120, so that the battery monomer 1120 stores electric energy. The electrode terminal 1123 usually includes a positive electrode terminal and a negative electrode terminal.

[0079] The external shape of the battery monomer 1120 is generally cylindrical or square columnar, so it is generally considered that the battery monomer 1120 has a height direction, and the direction perpendicular to the height direction can include the length direction and the width direction, or for the cylindrical battery monomer 1120, the direction perpendicular to the height direction can be considered as the radial direction, and the height direction can be called the axial direction.

[0080] Then, the electrode terminal 1123 and the tab 11221 are arranged in the first direction X, which can be understood as the length direction or the width direction or the radial direction of the battery monomer 1120, that is, the first direction X is perpendicular to the height direction, so it can be understood that the electrode terminal 1123 and the tab 11221 are arranged in the direction perpendicular to the height direction. For example, when the battery monomer 1120 is placed vertically, the height direction is the vertical direction, and the first direction X can be understood as the horizontal direction.

[0081] The adapter 1124 is used to connect the tab 11221 and the electrode terminal 1123 respectively, so that the tab 11221 and the electrode terminal 1123 are electrically connected. The adapter 1124 is generally made of metal material that can conduct electricity, for example, the adapter 1124 is generally made of copper, aluminum, nickel and composite materials with high electrical conductivity and thermal conductivity. As for the structure of the adapter 1124, the adapter 1124 includes a first adapter part 11241 and a second adapter part 11242, the first adapter part 11241 and the second adapter part 11242 are electrically connected, and the connection mode can include fixed connection or detachable connection, for example, welding; generally, the first adapter part 11241 and the second adapter part 11242 can be an integral structure, which is integrally prepared and formed, which is more convenient.

[0082] As for the setting position of the adapter 1124, specifically, the first adapter part 11241 is used to connect the tab 11221, so that the first adapter part 11241 is opposite to the tab 11221 and electrically connected in the second direction Y, the second adapter part 11242 is used to connect the electrode terminal 1123, so that the second adapter part 11242 is opposite to the electrode terminal 1123 and electrically connected, thereby realizing the electrical connection between the tab 11221 and the electrode terminal 1123. Taking the position of the first adapter part 11241 connected with the tab 11221 as an example, the welding mode can enhance the connection firmness between the first adapter part 11241 and the tab 11221. Of course, the second adapter part 11242 and the electrode terminal 1123 can also be connected by welding.

[0083] It should be noted that the second direction Y is perpendicular to the first direction X, and for the battery monomer 1120, the battery monomer 1120 has its own height direction, and the height direction is defined as the second direction Y, and the first direction X is perpendicular to the second direction Y, for example, the second direction Y is the height direction of the battery monomer 1120, and the height direction can be along the vertical direction, and the first direction X is the length direction of the battery monomer 1120. A third direction Z can also be defined, and the third direction Z is perpendicular to the first direction X and the second direction Y, and the third direction Z can be understood as the width direction of the battery monomer 1120, and the first direction X and the third direction Z are both horizontal directions.

[0084] Since the tab 11221 and the electrode terminal 1123 are arranged in the first direction X, it can be understood that the first adapter 11241 and the second adapter 11242 are also arranged in the first direction X.

[0085] In order to enhance the overcurrent capacity of the adapter 1124, the thickness of the first adapter 11241 can be limited to be greater than a predetermined thickness, which can be understood as a thickness that adversely affects welding. For example, the adapter 1124 can use a sheet-shaped adapter sheet, and if the thickness of the adapter sheet exceeds the predetermined thickness, the welding will be adversely affected, and the risk of loose welding, incomplete penetration, and large welding deformation will increase sharply. Therefore, although increasing the thickness of the adapter 1124 can enhance the overcurrent capacity, based on the increase in the adverse effects of welding when the thickness is greater than the predetermined thickness, in general, the thickness of the adapter 1124 should not be greater than the predetermined thickness.

[0086] In the present application, the thickness of the first adapter 11241 is greater than the predetermined thickness, so that the overcurrent capacity of the adapter 1124 is enhanced, and at the same time, the first sub-portion 11243 is formed on the first adapter 11241, the thickness of the first sub-portion 11243 is less than the thickness of other portions of the first adapter 11241, and the thickness of the first sub-portion 11243 is reduced, that is, the thickness of the first sub-portion 11243 meets the welding requirements, and welding is achieved between the first sub-portion 11243 and the tab 11221, so as to achieve the purpose of not easily producing the above welding problems.

[0087] The first sub-portion 11243 should be understood as a part of the structure of the first adapter 11241, and can even be considered as only a very small part of the first adapter 11241, and in the second direction Y, only the first sub-portion 11243 needs to be relatively connected between the tab 11221, for example, welding, to meet the welding requirements and achieve the welding effect.

[0088] It can be seen that the thickness of the first adapter portion 11241 in the adapter 1124 is greater than the preset thickness, which is equivalent to increasing the thickness of the first adapter portion 11241, thereby improving the flow capacity of the adapter 1124, and at the same time, the first sub-portion 11243 with a small thickness and meeting the welding requirements is formed on the first adapter portion 11241, so that the first sub-portion 11243 is welded with the tab 11221, thereby meeting the welding requirements to improve the flow capacity while ensuring the welding quality.

[0089] In the embodiment, the first sub-portion 11243 is arranged on the first adapter portion 11241 of the adapter 1124, and the first sub-portion 11243 is connected with the tab 11221, thereby realizing the fixation and electrical connection between the adapter 1124 and the tab 11221, and the thickness of the first sub-portion 11243 is less than that of other portions on the first adapter portion 11241, so that the thickness of the position of the adapter 1124 connected with the tab 11221 is reduced, thereby facilitating to improve the strength of the connection between the adapter 1124 and the tab 11221, reduce stress concentration, and when welding is adopted, it is also beneficial to reduce the welding difficulty and improve the welding quality; under the premise of the structure design, the thickness of the first adapter portion 11241 is greater than the preset thickness, that is, the thickness of the adapter 1124 is increased, thereby improving the flow capacity of the adapter 1124 without affecting the welding quality, and further improving the performance of the battery monomer 1120.

[0090] In some embodiments, referring to Figures 6-8 As shown, the first adapter portion 11241 has a first structure surface 112411 facing away from the tab 11221, and the first structure surface 112411 has a first groove structure 11245, and the groove bottom wall of the first groove structure 11245 forms the first sub-portion 11243.

[0091] Specifically, the adapter 1124 is located between the tab 11221 and the electrode terminal 1123, and the first adapter portion 11241 is arranged opposite to the tab 11221, so it can be known that the first adapter portion 11241 can be in a plate shape and has two opposite plate surfaces, wherein, it is defined that the side surface facing away from the tab 11221 is the first structure surface 112411, and the side surface facing the tab 11221 can be the first connecting surface 112412 described below, and it can be known that the first structure surface 112411 is parallel to the first direction X and perpendicular to the second direction Y.

[0092] By opening a first groove structure 11245 on the first structural surface 112411, it can be seen that the thickness of the bottom wall of the first groove structure 11245 on the first adapter 11241 is less than the thickness of other parts on the first adapter 1124, so that the bottom wall of the first groove structure 11245 forms the first sub-part 11243, and the surface of the first sub-part 11243 that is connected to the tab 11221 is the surface of the bottom wall of the first groove structure 11245 facing the tab 11221.

[0093] The first groove structure 11245 is formed so that a first sub-part 11243 with reduced thickness is formed on the first transition part 11241. The thickness of the first sub-part 11243 can be reduced compared to the thickness of other parts on the first transition part 11241. The thickness of the first sub-part 11243 can be reduced to meet the welding requirements. The groove structure not only reduces weight but also facilitates manufacturing.

[0094] In addition, since the first sub-part 11243 needs to be welded to the tab 11221, the first groove structure 11245 is opened so that the groove space of the first groove structure 11245 can accommodate the deformation and weld protrusion caused by welding, thereby helping to reduce the interference of weld protrusion on other components (such as the first wall part 11215).

[0095] In this embodiment, by opening a first groove structure 11245 on the first adapter portion 11241, a first sub-part 11243 with reduced thickness is formed, so that the first sub-part 11243 meets the welding quality requirements between it and the tab 11221.

[0096] In some embodiments, refer to Figure 8 As shown, there are multiple first groove structures 11245, and the multiple first groove structures 11245 are arranged at intervals on the first structural surface 112411.

[0097] One first groove structure 11245 may be provided, or multiple first groove structures 11245 may be provided. That is to say, multiple first sub-parts 11243 may be provided, and each first sub-part 11243 is welded to the electrode tab 11221.

[0098] In view of the large area of the connecting surface of the tab 11221 connected with the first adapter part 11241, when a first groove structure 11245 is opened, the width and length of the groove are large, which can easily affect the structural strength of the first connecting part. Therefore, a plurality of first groove structures 11245 can be opened on the first structure surface 112411, so that the size of the opening of each first groove structure 11245 is reduced, and the plurality of first groove structures 11245 are arranged at intervals, and a partition rib body is formed between adjacent first groove structures 11245. The partition rib body is used to separate the two adjacent first groove structures 11245 and also plays a connecting role, thereby improving the overall structural strength of the first adapter part 11241. The partition rib body can also conduct current, thereby also being beneficial to improve the flow area and thereby improve the flow strength of the first adapter part 11241.

[0099] In the embodiment, by arranging a plurality of first groove structures 11245, it is beneficial to reduce the influence on the structural strength of the first connecting part and beneficial to increase the flow area and improve the flow strength.

[0100] In some embodiments, referring to Figure 8 It is shown that the first groove structure 11245 is provided with two, and the two first groove structures 11245 are arranged at intervals along the third direction Z, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0101] It should be noted that the third direction Z is a direction perpendicular to the first direction X and the second direction Y. For the battery monomer 1120, the second direction Y is the height direction of the battery monomer 1120. Since the first groove structure 11245 is opened on the first structure surface 112411, it can be understood that the first structure surface 112411 is parallel to the first direction X and perpendicular to the second direction Y. Therefore, it can be understood that the third direction Z is perpendicular to the second direction Y. For example, the first direction X is the length direction of the battery monomer 1120, and the second direction Y can be understood as the height direction of the battery monomer 1120. Therefore, the third direction Z is the width direction of the battery monomer 1120, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0102] Therefore, the two first groove structures 11245 are arranged at intervals in the width direction of the battery monomer 1120, and a partition rib body for partitioning is formed between the two first groove structures 11245. The partition rib body can be located at the middle position of the first structure surface 112411, so that the two first groove structures 11245 are symmetrically arranged about the partition rib body.

[0103] It can be known that the first sub portion 11243 is provided with two, and the first adapter portion 11241 forms two positions welded with the tab 11221 in the width direction, so as to improve the welding firmness between the first adapter portion 11241 and the tab 11221, and facilitate to reduce stress concentration and make stress distribution more uniform.

[0104] In the embodiment, two first slot structures 11245 are arranged in the third direction Z, and each first slot structure 11245 is welded with the tab 11221, which is beneficial to improve the welding strength.

[0105] In some embodiments, referring to Figure 8 It can be known that the first slot structure 11245 is a slot structure with an open side.

[0106] Taking the slot opening of the first slot structure 11245 as a rectangle as an example, the first slot structure 11245 has four slot walls, and the slot wall in the second direction Y and close to the edge of the first adapter portion 11241 forms a through opening which penetrates the edge of the first adapter portion 11241, so that the first slot structure 11245 forms an open side at the side of the first adapter portion 11241. It can be known that the first slot structure 11245 is a slot structure with an open side.

[0107] In the embodiment, the first slot structure 11245 which penetrates the edge is more convenient to process and manufacture, which is beneficial to reduce the processing difficulty and improve the processing quality and precision of the first slot structure 11245.

[0108] In some embodiments, referring to Figure 6 and Figure 7 It can be known that the first slot structure 11245 is a slot structure with an open side.

[0109] The first adapter portion 11241 can be in the form of a plate, and it can be known that the first structure surface 112411 and the first connection surface 112412 are two opposite plate surfaces of the first adapter portion 11241, the first structure surface 112411 is arranged away from the tab 11221, and the first connection surface 112412 is arranged towards the tab 11221 and connected with the tab 11221. The first connection surface 112412 and the first structure surface 112411 can be arranged in parallel.

[0110] The first connecting surface 112412 is planar, and the connecting surface of the tab 11221 is also planar. Therefore, when the first adapter 11241 is connected to the tab 11221, the first connecting surface 112412 can be fitted to the connecting surface of the tab 11221. The connecting surface of the tab 11221 can be the surface formed after bending the bent tab 11221, connecting to the adapter 1124. Alternatively, the connecting surface of the tab 11221 can also be a connecting end face formed by stacking multiple non-bent tabs 11221. The area where the first connecting surface 112412 and the connecting surface of the tab 11221 fit together is the welding area of ​​the tab 11221.

[0111] In this embodiment, the planar first connecting surface 112412 can increase the connecting area with the tab 11221, enhance the fit, reduce the generation of gaps, and thus help improve the welding quality.

[0112] In some embodiments, refer to Figure 7 As shown, along the first direction X, the tab 11221 has a first width L1, and the first sub-part 11243 has a second width L2, wherein the first width L1 is greater than or equal to the second width L2.

[0113] Specifically, in the first direction X, the tab 11221 has a first width L1. Since the tab 11221 of the first sub-part 11243 is attached to the surface, it can be known that the first sub-part 11243 will have a second width L2 in the first direction X. The second width L2 can also be understood as the extension length (or extension width) of the bottom wall of the groove structure 11245 in the first direction X.

[0114] The first width L1 is made greater than the second width L2. That is, the width of the tab 11221 is greater than the width of the first sub-part 11243. In other words, on the first connecting surface 112412, the width of the tab 11221 is greater than the width of the first sub-part 11243. The tab 11221 is wider than the first sub-part 11243. In addition to covering the surface of the first sub-part 11243, the tab 11221 can also extend to other parts of the first connecting part. It can be seen that the width of the tab 11221 is not limited by the groove width of the first groove structure 11245. Therefore, the width of the tab 11221 can be designed to be wider, thereby increasing the contact area with the first connecting part.

[0115] In this embodiment, the tab 11221 is wider than the first sub-part 11243, so that the tab 11221 can cover the entire surface of the first sub-part 11243 and fit against the first sub-part 11243, thereby providing sufficient welding area between the tab 11221 and the first sub-part 11243, which is beneficial to improving the welding strength.

[0116] In some embodiments, the first sub-part 11243 is connected to the tab 11221 by ultrasonic welding.

[0117] Ultrasonic welding, or ultrasonic welding for short, uses the combined action of high-frequency elastic vibration and static pressure to activate particles in the metal lattice. The molecules at the junction penetrate each other and are firmly connected, resulting in high welding strength. This effectively reduces the probability of loosening or falling off the tab 11221 and the adapter 1124 during use, making the electrical connection of the battery cell 1120 more stable.

[0118] Ultrasonic welding does not melt the material during the welding process, does not produce spatter, and does not damage the molecular structure of the tab 11221 and the first adapter 11241, thereby achieving advantages such as good conductivity and low resistance. It can reduce energy loss during the charging and discharging process of the battery cell 1120 and improve the charging and discharging efficiency and performance of the battery cell 1120.

[0119] Furthermore, ultrasonic welding typically takes a short time, enabling the welding of the tab 11221 to the first adapter 11241 to be completed in a short period of time, which greatly improves production efficiency and is suitable for large-scale, automated production.

[0120] In this embodiment, the tab 11221 and the first sub-part 11243 are connected by ultrasonic welding, which can improve welding quality, reduce loss, increase efficiency, and help improve the performance of the battery cell 1120.

[0121] In some embodiments, refer to Figure 10 As shown, the first adapter 11241 has a first connecting surface 112412 facing the tab 11221, and the first connecting surface 112412 has a second groove structure 11246, and the tab 11221 is at least partially accommodated in the second groove structure 11246.

[0122] The first connecting surface 112412 is the surface opposite to the first structural surface 112411. When the first transition part 11241 is plate-shaped, the first connecting surface 112412 and the first structural surface 112411 are the two plate surfaces of the first transition part 11241.

[0123] The second groove structure 11246 is formed on the first connecting surface 112412, and the second groove structure 11246 can be arranged opposite to the first groove structure 11245. Of course, multiple second groove structures 11246 can also be provided, and multiple first groove structures 11245 are separated by rib structures. The second groove structure 11246 can reduce the weight of the adapter 1124.

[0124] The tab 11221 can be accommodated in the first structure groove, thereby facilitating saving space of the battery monomer 1120 in the height direction. In addition, since the tab 11221 can be accommodated in the second groove structure 11246, it can be known that the thickness of the first adapter part 11241 can be further increased, that is, the area of the first adapter part 11241 above the second groove structure 11246 can be further thickened, thereby enabling the first adapter part 11241 to utilize the space on both sides of the tab 11221 to achieve the purpose of increasing the thickness, thereby facilitating improving the flow capacity of the adapter 1124.

[0125] In the embodiment, by additionally providing the second structure groove, the thickness of the first adapter part 11241 can be further increased, and the flow capacity of the adapter 1124 can be improved.

[0126] In some embodiments, referring to Figures 8-10 As shown, the second adapter part 11242 has a second sub-part 11244 arranged opposite to and electrically connected with the electrode terminal 1123, and the thickness of the second sub-part 11244 is less than that of other parts of the second adapter part 11242.

[0127] Specifically, in order to enhance the flow capacity of the adapter 1124, the thickness of the second adapter part 11242 is further increased while the thickness of the first adapter part 11241 is increased, so that the thicknesses of the first adapter part 11241 and the second adapter part 11242 are both greater than a preset thickness. Taking the welding between the second adapter part 11242 and the electrode terminal 1123 as an example, it can be known that the preset thickness can be understood as a thickness that adversely affects welding, and specific descriptions can be referred to the above-described embodiments.

[0128] In the present application, the thickness of the second adapter part 11242 is greater than the preset thickness, so that the flow capacity of the adapter 1124 is enhanced, and at the same time, the second sub-part 11244 is formed on the second adapter part 11242, and the thickness of the second sub-part 11244 is less than that of other parts of the second adapter part 11242. The thickness of the second sub-part 11244 is reduced, that is, the thickness of the second sub-part 11244 meets the welding requirements, and welding between the second sub-part 11244 and the electrode terminal 1123 is achieved, thereby achieving the purpose of not easily causing the above-described welding problems.

[0129] The second sub-part 11244 should be understood as a part of the structure of the second adapter part 11242, and can even be considered as only a very small part of the second adapter part 11242. Only the second sub-part 11244 needs to be electrically connected and fixed with the electrode terminal 1123, for example, by welding, so as to meet the welding requirements and achieve the welding effect.

[0130] As can be seen, in the adapter 1124, the thickness of the second adapter portion 11242 is greater than the preset thickness, which is equivalent to increasing the thickness of the second adapter portion 11242, thereby improving the current carrying capacity of the adapter 1124. At the same time, a second sub-part 11244 with a smaller thickness that meets the welding requirements is formed on the second adapter portion 11242, and the second sub-part 11244 is welded to the electrode terminal 1123, thereby meeting the welding requirements, so as to improve the current carrying capacity while ensuring the welding quality.

[0131] In this embodiment, a second sub-part 11244 is provided on the second adapter portion 11242 of the adapter 1124. By electrically connecting the second sub-part 11244 with the electrode terminal 1123, the adapter 1124 and the electrode terminal 1123 are fixed and electrically connected. The thickness of the second sub-part 11244 is less than the thickness of other parts of the second adapter portion 11242, thereby reducing the thickness of the part of the adapter 1124 connected to the electrode terminal 1123. This helps to improve the strength of the connection between the adapter 1124 and the electrode terminal 1123, reduce stress concentration, and reduce welding difficulty and improve welding quality when welding is used. Under this structural design, the thickness of the first adapter portion 11241 and the second adapter portion 11242 can be greater than the preset thickness, that is, increase the thickness of the adapter 1124. This can improve the current carrying capacity of the adapter 1124 without affecting the welding quality, thereby improving the performance of the battery cell 1120.

[0132] In some embodiments, refer to Figure 9 and Figure 10 As shown, the second adapter 11242 has a third groove structure 11247 on one side of the electrode terminal 1123 facing away from the electrode terminal 1123, and the bottom wall of the groove of the third groove structure 11247 forms a second sub-section 11244.

[0133] Specifically, the adapter 1124 is located between the tab 11221 and the electrode terminal 1123, and the second adapter 11242 is disposed opposite to the electrode terminal 1123. It can be seen that the second adapter 11242 can be plate-shaped and has two back-to-back plate surfaces. The surface facing away from the electrode terminal 1123 is defined as the second structural surface 112421, and the surface facing the electrode terminal 1123 can be the second connecting surface 112422 described below.

[0134] The third groove structure 11247 is formed on the second structure surface 112421, and the thickness of the groove bottom wall of the third groove structure 11247 on the second adapter 11242 is smaller than the thickness of other parts of the second adapter 1124. Thus, the groove bottom wall of the third groove structure 11247 forms the second sub-portion 11244, and the surface of the second sub-portion 11244 connected to the electrode terminal 1123 is the surface of the groove bottom wall of the third groove structure 11247 facing the electrode terminal 1123.

[0135] The third groove structure 11247 is formed on the second structure surface 112421, and the thickness of the groove bottom wall of the third groove structure 11247 on the second adapter 11242 is smaller than the thickness of other parts of the second adapter 1124. Thus, the groove bottom wall of the third groove structure 11247 forms the second sub-portion 11244, and the surface of the second sub-portion 11244 connected to the electrode terminal 1123 is the surface of the groove bottom wall of the third groove structure 11247 facing the electrode terminal 1123.

[0136] In addition, since the second sub-portion 11244 needs to be welded with the electrode terminal 1123, the third groove structure 11247 is formed to make the space in the groove of the third groove structure 11247 accommodate the deformation and welding mark protrusion caused by welding, thereby reducing the interference of the welding mark protrusion on other components (for example, the second wall portion 11216).

[0137] In the embodiment, the third groove structure 11247 is formed on the second adapter 11242 to form the second sub-portion 11244 with reduced thickness, and the second sub-portion 11244 meets the welding quality requirement with the electrode terminal 1123.

[0138] In some embodiments, the second sub-portion 11244 is connected to the electrode terminal 1123 by laser welding.

[0139] Specifically, laser welding of the second sub-portion 11244 and the electrode terminal 1123 can improve the connection strength. During laser welding, the high-energy-density laser beam rapidly melts and cools and solidifies the connection part of the second sub-portion 11244 and the electrode terminal 1123 to form a firm metallurgical bond. The welding joint has high strength and can withstand large tensile and shear forces, ensuring stable connection of the second sub-portion 11244 and the electrode terminal 1123 during long-term use. During laser welding, heat is concentrated, welding speed is fast, welding seam is narrow and uniform, heat-affected zone is small, and the influence on the performance of the surrounding material is reduced. The welding seam surface is smooth without obvious pores, cracks and other defects, improving the appearance and reliability of the welding.

[0140] The heat-affected zone of the laser welding is small, and the heat-affected zone of the second sub-portion 11244 and the electrode terminal 1123 is small, which reduces the risk of damage or performance degradation of the second sub-portion 11244 and the electrode terminal 1123 caused by heat transfer during the welding process, and improves the safety and reliability of the entire battery cell 1120.

[0141] In the embodiment, the laser welding can improve the connection strength and welding quality between the second sub-portion 11244 and the electrode terminal 1123.

[0142] In some embodiments, referring to Figures 3-7 As shown in the figure, the shell 1121 includes a first shell wall 11214, the first shell wall 11214 has a first wall portion 11215 and a second wall portion 11216, the first wall portion 11215 is arranged opposite to the first adapter portion 11241, and the second wall portion 11216 is arranged opposite to the second adapter portion 11242, the electrode terminal 1123 is connected to the second wall portion 11216, and the first wall portion 11215 protrudes away from the second wall portion 11216 in a direction away from the tab 11221, and the tab 11221 and the electrode terminal 1123 form an overlapping area in the second direction Y.

[0143] The energy density of the battery cell 1120 refers to the energy stored per unit volume or per unit mass, which is one of the important indicators for measuring the performance of the battery cell 1120. Among them, under the condition that the external size of the battery cell 1120 is constant, the larger the volume of the electrode assembly 1122 inside the battery cell 1120, the higher the space utilization rate of the battery cell 1120, and the higher the energy density of the battery cell 1120.

[0144] Specifically, the first shell wall 11214 is in a plate or sheet shape, and the first wall portion 11215 and the second wall portion 11216 can both be in a sheet shape, and the first wall portion 11215 and the second wall portion 11216 are two adjacent portions or regions on the first shell wall 11214, and for the first shell wall 11214, the first shell wall 11214 can be a cover portion 11212 in the shell 1121, or the first shell wall 11214 can also be a part of the shell portion 11213 in the shell 1121.

[0145] The first wall portion 11215 and the second wall portion 11216 should be arranged in connection or spaced apart in the first direction X, so that the first wall portion 11215 is arranged opposite to the first adapter portion 11241, and the tab 11221 and the electrode assembly 1122 are arranged opposite to the first wall portion 11215, the second wall portion 11216 is arranged opposite to the second adapter portion 11242, and the electrode terminal 1123 is connected to the second wall portion 11216, so that the second wall portion 11216 is arranged opposite to the second adapter portion 11242, and the electrode terminal 1123 is welded and fixed to the second sub-portion 11244 on the second adapter portion 11242.

[0146] For the relative position relationship of the first wall portion 11215 and the second wall portion 11216, in the second direction Y, the first wall portion 11215 protrudes in a direction away from the tab 11221 and the electrode assembly 1122, the first wall portion 11215 is connected to the second wall portion 11216, so that a step is formed between the first wall portion 11215 and the second wall portion 11216, and a transition connection portion is formed between the first wall portion 11215 and the second wall portion 11216, for example, the first wall portion 11215 and the second wall portion 11216 are connected to form a Z-shaped first shell wall 11214. Wherein, the second direction Y is perpendicular to the first direction X, and when the first direction X is the length direction (or the width direction) of the shell 1121, then the second direction Y is the height direction of the shell 1121.

[0147] When the first shell wall 11214 is a cover portion 11212 in the shell 1121, it can be known that the first wall portion 11215 protrudes outward on the first shell wall 11214, and the first wall portion 11215 can be located at the middle position of the first shell wall 11214, so that the battery monomer 1120 forms a convex battery monomer 1120, and the convex corresponds to the outwardly protruding first wall portion 11215.

[0148] Generally, the electrode terminal 1123 forms a protruding portion outwardly protruding from the surface of the first shell wall 11214 on the first shell wall 11214, and the space on both sides of the protruding portion generally forms a redundant space. Therefore, in the present application, the first wall portion 11215 protrudes outward in a direction away from the tab 11221, so that the lateral redundant space of the protruding portion of the electrode terminal 1123 is utilized, the first wall portion 11215 and the electrode terminal 1123 can form an overlapping area in the second direction Y, so as to increase the height of the accommodating cavity 11211 in the second direction Y inside the shell 1121, and further increase the volume of the electrode assembly 1122, so as to increase the energy density of the battery monomer 1120.

[0149] In addition, the first shell wall 11214 is outwardly convex, so that the position of the tab 11221 is also moved in a direction away from the electrode assembly 1122, and the tab 11221 can overlap the electrode terminal 1123 in the second direction Y, which is conducive to increasing the volume of the electrode assembly 1122, saving space, and improving space utilization, so as to improve the energy density of the battery monomer 1120.

[0150] In the embodiment, by making the first wall portion 11215 outwardly convex relative to the second wall body, the volume of the electrode assembly 1122 is increased, and the energy density of the battery monomer 1120 is further improved.

[0151] In some embodiments, referring to Figures 6-10 As shown, the first adapter portion 11241 and the second adapter portion 11242 are arranged in a staggered manner, so that the first adapter portion 11241 overlaps the electrode terminal 1123 in the second direction Y.

[0152] Specifically, the first direction X can be understood as the length (or width) direction of the shell 1121, and the second direction Y can be understood as the height direction of the shell 1121. Since the first adapter portion 11241 is opposite to the first wall portion 11215, and the second adapter portion 11242 is opposite to the second wall portion 11216, the shape of the adapter 1124 should match the shape of the first wall portion 11215 and the second wall portion 11216. Therefore, the first adapter portion 11241 and the second adapter portion 11242 should be arranged in a staggered manner in the second direction Y, so that the first adapter portion 11241 and the electrode terminal 1123 can form corresponding parts in the second direction Y, that is, the first adapter portion 11241 and the electrode terminal 1123 form an overlapping area, thereby saving the height space occupied by the first adapter portion 11241 and the electrode terminal 1123 in the second direction Y.

[0153] In the embodiment, the first adapter portion 11241 and the electrode terminal 1123 form an overlapping area, which is conducive to increasing the volume of the electrode assembly 1122, and further increasing the energy density of the battery monomer 1120.

[0154] In some embodiments, the thickness of the first adapter portion 11241 is greater than a preset thickness, and the preset thickness is 1.0 mm.

[0155] Specifically, the preset thickness is equal to 1.0 mm. It can be known that the thickness of the first adapter portion 11241 is greater than 1.0 mm, and the thickness of the second adapter portion 11242 can also be greater than 1.0 mm, for example, the thickness of the first adapter portion 11241 and the second adapter portion 11242 can be 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0156] In the embodiment, increasing the thickness of the adapter 1124 can improve the flow capacity of the adapter 1124 and can improve the structural strength of the adapter 1124, thereby achieving the purpose of improving the performance of the battery monomer 1120.

[0157] In one specific embodiment, with reference to Figures 3-10As shown, the battery cell 1120 comprises a shell 1121, an electrode assembly 1122, an electrode terminal 1123 and an adapter 1124, wherein the shell 1121 has a receiving cavity 11211; the electrode assembly 1122 is received in the receiving cavity 11211, and the electrode assembly 1122 has a tab 11221; the electrode terminal 1123 is connected to the shell 1121, and the electrode terminal 1123 is disposed apart from the tab 11221 in a first direction X; the adapter 1124 comprises a first adapter part 11241 and a second adapter part 11242 connected to each other, and along a second direction Y, the first adapter part 11241 is opposite to and electrically connected to the tab 11221, and the second adapter part 11242 is opposite to and electrically connected to the electrode terminal 1123; the first adapter part 11241 has a first subpart 11243 opposite to and electrically connected to the tab 11221, and the thickness of the first subpart 11243 is less than that of other parts of the first adapter part 11241; the second direction Y is perpendicular to the first direction X; the first adapter part 11241 has a first structure surface 112411 facing away from the tab 11221, and the first structure surface 112411 has a first groove structure 11245, and the groove bottom wall of the first groove structure 11245 forms the first subpart 11243; the first groove structure 11245 is provided with a plurality of groove structures, and the plurality of first groove structures 11245 are disposed apart from each other on the first structure surface 112411; the first groove structure 11245 is provided with two groove structures, and the two first groove structures 11245 are disposed apart from each other along a third direction Z, and the third direction Z is perpendicular to the first direction X and the second direction Y; the first subpart 11243 is connected to the tab 11221 in a manner of ultrasonic welding; the second adapter part 11242 has a second subpart 11244 opposite to and electrically connected to the electrode terminal 1123, and the thickness of the second subpart 11244 is less than that of other parts of the second adapter part 11242; one side of the second adapter part 11242 facing away from the electrode terminal 1123 has a third groove structure 11247, and the groove bottom wall of the third groove structure 11247 forms the second subpart 11244; the second subpart 11244 is connected to the electrode terminal 1123 in a manner of laser welding; the shell 1121 comprises a first shell wall 11214, and the first shell wall 11214 has a first wall part 11215 and a second wall part 11216, the first wall part 11215 is opposite to the first adapter part 11241, the second wall part 11216 is opposite to the second adapter part 11242, the electrode terminal 1123 is connected to the second wall part 11216, the first wall part 11215 protrudes away from the tab 11221 relative to the second wall part 11216, and the tab 11221 and the electrode terminal 1123 form an overlapping area in the second direction Y.

[0158] According to some embodiments of the present application, with reference to Figure 2As shown, the application also provides a battery apparatus 1100, the battery apparatus 1100 comprising the battery cell 1120 according to any one of the above embodiments. The battery apparatus 1100 disclosed in the embodiments of the application can be used in various energy storage devices and energy storage systems using the battery apparatus 1100 as a power source or an energy storage element.

[0159] The battery apparatus 1100 can comprise one or more battery cell assembly components for providing voltage and capacity. The battery cell assembly component can comprise a plurality of battery cells 1120 connected in series, in parallel or in a mixed connection through a busbar component.

[0160] The battery apparatus 1100 can be a battery pack, which generally comprises a box 1110 and one or more battery cell assembly components housed in the box 1110.

[0161] The battery apparatus 1100 also comprises a box 1110, in which the battery cell 1120 is housed in a housing space 1113. For the box 1110, refer to the description of the box 1110 in the above embodiments. Figure 2 As shown, the box 1110 is used to house the battery cell 1120, and therefore, the box 1110 can comprise a first part 1111 and a second part 1112, the first part 1111 and the second part 1112 being mutually coverable, and the first part 1111 and the second part 1112 together defining a housing space 1113 for accommodating the battery cell 1120. The second part 1112 can be a hollow structure with one end open, and the first part 1111 can be a plate-shaped structure, which is coverable on the open side of the second part 1112 to make the first part 1111 and the second part 1112 together define the housing space 1113; the first part 1111 and the second part 1112 can also both be hollow structures with one side open, and the open side of the first part 1111 is coverable on the open side of the second part 1112. Of course, the box 1110 formed by the first part 1111 and the second part 1112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0162] According to some embodiments of the application, the application also provides an energy storage device comprising a plurality of battery cells 1120 according to the above embodiments or comprising a plurality of battery apparatuses 1100 according to the above embodiments, the battery cells 1120 and the battery apparatuses 1100 being used to store or provide electrical energy.

[0163] Specifically, the energy storage device can include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery cells 1120 or a plurality of battery devices 1100 connected in series by a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0164] The energy storage device can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the low electricity consumption period, and provide electrical energy for related users or electrical equipment during the peak electricity consumption period. The energy storage system provided by the embodiments of the present application can be any power system that needs to use an energy storage device.

[0165] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0166] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are contained in the cabinet body.

[0167] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0168] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid to each battery device 1100 through a pipeline to adjust the temperature of the battery cell 1120.

[0169] As an example, the master control module can serve as a battery management unit of the battery cluster to monitor and manage the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0170] As an example, the master control module can be used as a battery management unit of the energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, and the like of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and an optical fiber conversion module.

[0171] As an example, the fire control module includes a control panel, a detector, an alarm device, and the like, which are used to detect, alarm, or extinguish the energy storage system.

[0172] As an example, the power distribution module can be used to distribute power to the modules that need power in the energy storage device.

[0173] According to some embodiments of the present application, the present application also provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0174] In some embodiments, the energy storage system can include one or more energy storage devices and a power conversion device (Power Converter System, PCS) used to connect between the power generation device and the energy storage device. The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored in the energy storage device through the power conversion device. As an example, the power generation device can be a solar panel, a water power generation device, a fire power generation device, a wind power generation device, and the like. The specific type of the power generation device is not limited in the present application.

[0175] According to some embodiments of the present application, referring to Figure 1 As an example, the master control module can be used as a battery management unit of the energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, and the like of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and an optical fiber conversion module.

[0176] The following embodiments are described by taking a vehicle 1000 as an example.

[0177] Please refer to Figure 1 , as shown in the figure. Figure 1 The vehicle 1000 provided by some embodiments of the present application is a structural schematic diagram. The vehicle 1000 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or an extended range car. The vehicle 1000 is internally provided with a battery device 1100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 1100 can be used for power supply of the vehicle 1000, for example, the battery device 1100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery device 1100 to supply power to the motor 1300, for example, for the power demand of the vehicle 1000 during starting, navigation and driving.

[0178] In some embodiments of the present application, the battery device 1100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0179] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers 1120, such as mobile phones, portable devices, notebook computers, electric cars, electric toys, electric tools, vehicles 1000, ships and spacecraft, such as aircraft, rockets, space shuttles and spacecraft.

[0180] The examples of the electric device in the present application are based on the examples of the above-mentioned battery monomer 1120 and the battery device 1100, and the examples of the electric device contain all the technical effects of the above-mentioned examples of the battery monomer 1120 and the battery device 1100, which will not be described again.

[0181] According to some embodiments of the present application, the present application also provides a charging network, which includes a charging pile and an energy storage device in the above-mentioned embodiments or an energy storage system in the above-mentioned embodiments, and the energy storage device is used to provide electric energy for the charging pile.

[0182] For example, the charging network includes a charging pile and an energy storage device, and the charging pile is electrically connected with the energy storage device, and the energy storage device is used to provide electric energy for the charging pile. The charging pile and the battery device 1100 in the energy storage device are electrically connected through a cable, and the battery device 1100 can provide the electric energy stored by itself to the charging pile. The charging pile has one or more connectors, which are used to connect with the electric device (such as the vehicle 1000), so as to supplement the electric energy to the electric device.

[0183] The energy storage device can be located inside the charging pile (for example, a charging and storage integrated machine) or outside the charging pile.

[0184] The above is only a preferred embodiment of the present application, only the technical principle of the present application is specifically described, and these descriptions are only for explaining the principle of the present application, and cannot be explained as a limitation on the protection scope of the present application in any way. Based on the explanation here, any modification, equivalent replacement and improvement made in the spirit and principle of the present application, and other specific embodiments of the present application that can be easily thought of by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A battery cell (1120) characterized by, The application relates to a battery electrode terminal structure, comprising: a shell (1121) with a containing cavity (11211); an electrode assembly (1122) contained in the containing cavity (11211), the electrode assembly (1122) having a tab (11221); an electrode terminal (1123) connected to the shell (1121), the electrode terminal (1123) being arranged in a first direction (X) and spaced apart from the tab (11221); an adapter (1124) comprising a first adapter part (11241) and a second adapter part (11242) connected to each other, the first adapter part (11241) being opposite to and electrically connected to the tab (11221) along a second direction (Y), and the second adapter part (11242) being opposite to and electrically connected to the electrode terminal (1123) along the second direction (Y); the first adapter part (11241) has a first subpart (11243) opposite to and electrically connected to the tab (11221) along the second direction (Y), and the thickness of the first subpart (11243) is smaller than that of other parts of the first adapter part (11241); and the second direction (Y) is perpendicular to the first direction (X).

2. The battery cell (1120) of claim 1, wherein, The first adapter part (11241) has a first structure surface (112411) facing away from the tab (11221), and the first structure surface (112411) has a first groove structure (11245), and the groove bottom wall of the first groove structure (11245) forms the first subpart (11243).

3. The battery cell (1120) of claim 2, wherein, The first groove structure (11245) is provided with a plurality of first groove structures (11245) arranged in a spaced-apart manner on the first structure surface (112411).

4. The battery cell (1120) of claim 3, wherein, The first groove structure (11245) is provided with two first groove structures (11245) arranged in a spaced-apart manner along a third direction (Z), and the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y).

5. The battery cell (1120) of claim 4, wherein, In the third direction (Z), the two first groove structures (11245) penetrate to the edge of the first adapter part (11241).

6. The battery cell (1120) of claim 2, wherein, The first adapter part (11241) has a first connecting surface (112412) opposite to the first structure surface (112411), and the first connecting surface (112412) is a plane and is connected to the tab (11221) in a close-fitting manner.

7. The battery cell (1120) of claim 1, wherein, Along the first direction (X), the tab (11221) has a first width (L1), and the first subpart (11243) has a second width (L2), and the first width (L1) is greater than or equal to the second width (L2).

8. The battery cell (1120) of claim 1, wherein, The first subpart (11243) is connected to the tab (11221) in a manner of ultrasonic welding.

9. The battery cell (1120) of claim 1, wherein, The first adapter portion (11241) has a first connecting surface (112412) facing the tab (11221), the first connecting surface (112412) has a second groove structure (11246) thereon, the tab (11221) is at least partially accommodated in the second groove structure (11246).

10. The battery cell (1120) of any one of claims 1-9, wherein, The second adapter portion (11242) has a second sub-portion (11244) oppositely arranged with the electrode terminal (1123), the second sub-portion (11244) has a thickness smaller than that of other portions of the second adapter portion (11242), and the second sub-portion (11244) is welded with the electrode terminal (1123).

11. The battery cell (1120) of claim 10, wherein, The second adapter portion (11242) has a third groove structure (11247) on a side thereof facing away from the electrode terminal (1123), and a groove bottom wall of the third groove structure (11247) forms the second sub-portion (11244).

12. The battery cell (1120) of claim 10, wherein, The second sub-portion (11244) is connected with the electrode terminal (1123) by laser welding.

13. The battery cell (1120) of any one of claims 1-9, wherein, The shell (1121) includes a first shell wall (11214) having a first wall portion (11215) and a second wall portion (11216), the first wall portion (11215) is oppositely arranged with the first adapter portion (11241), the second wall portion (11216) is oppositely arranged with the second adapter portion (11242), the electrode terminal (1123) is connected to the second wall portion (11216), the first wall portion (11215) protrudes away from the tab (11221) relative to the second wall portion (11216), and the tab (11221) and the electrode terminal (1123) form an overlapping area in the second direction (Y).

14. The battery cell (1120) of claim 13, wherein, The first adapter portion (11241) and the second adapter portion (11242) are arranged in a staggered manner, so that the first adapter portion (11241) and the electrode terminal (1123) form an overlapping area in the second direction (Y).

15. The battery cell (1120) of any one of claims 1-9, wherein, The thickness of the first adapter portion (11241) is greater than a preset thickness, and the preset thickness is 1.0 mm.

16. A battery device (1100) characterized by The battery device (1100) includes the battery cell (1120) according to any one of claims 1-15.

17. An electrical device, comprising: The battery device (1100) includes the battery cell (1120) according to any one of claims 1-15 or the battery device (1100) according to claim 16, and the battery device (1100) is used for storing or providing electric energy.

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