End battery monomer, battery device and electric equipment

Abstract

The utility model discloses an end battery monomer, a battery device and electric equipment, and relates to the technical field of batteries, the end battery monomer comprises a shell, an electrode assembly and electrode terminals, the electrode assembly is arranged in the shell, at least one end of the shell along a first direction is provided with the electrode terminal, the electrode terminal is electrically connected with the electrode assembly, and the electrode assembly is electrically connected with the shell along a second direction. An end plate is integrally formed on one side wall, in the second direction, of the shell, and the first direction and the second direction intersect. According to the technical scheme provided by the invention, the end plates are integrally formed to the side walls of the shell, so that the structural strength of the end plates is improved, expansion deformation of the end battery monomers is effectively inhibited, and the probability that the end battery monomers are damaged due to excessive expansion is reduced.

Description

Technical Field

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

[0002] In existing new energy vehicles, the power battery pack is a very important energy supply system. During long-term charge and discharge cycles, the individual battery cells will expand to a certain extent. This can easily lead to a large amount of deformation in the battery module composed of multiple stacked battery cells. It is difficult to suppress the expansion and deformation of the battery module by relying on traditional end plate structures. Utility Model Content

[0003] The main purpose of this application is to propose an end-cell battery, battery device, and electrical equipment, which aims to improve the problem that traditional endplate structures are difficult to suppress the expansion and deformation of battery modules.

[0004] In a first aspect, the end battery cell proposed in this application includes a housing, an electrode assembly, and an electrode terminal. The electrode assembly is disposed inside the housing. The electrode terminal is disposed at at least one end of the housing along a first direction. The electrode terminal is electrically connected to the electrode assembly. An end plate is integrally formed on one side wall of the housing along a second direction. The first direction and the second direction are intersecting.

[0005] The technical solution provided in this application has an end plate on one side wall of the end battery cell housing along the second direction. While meeting the overall thickness requirements of the housing and end plate along the second direction, the end plate is integrally formed with the side wall of the housing, which is equivalent to improving the structural strength of the end plate. When the end battery cell is arranged along the first direction at the end of a row of multiple battery cells, it can fix the row of battery cells, effectively suppress the expansion deformation of the row of multiple battery cells, and reduce the probability of the battery cells being damaged due to excessive expansion.

[0006] In some embodiments, a cavity is formed within the end plate.

[0007] In this design, while ensuring the structural strength of the end plate and the housing, a cavity is formed inside the end plate to reduce the overall mass of the end plate and the housing, thereby increasing the energy density of the battery device.

[0008] In some embodiments, the cavity is filled with a heat insulation element.

[0009] Since the end plate and the side wall of the housing are integrally formed, the number of heat insulation pads can be reduced, which is equivalent to reducing the overall size of multiple battery cells in a row, which is beneficial to improving the energy density of the battery device. Moreover, the heat insulation component in the cavity of the end plate can limit the heat conduction on the end plate along the second direction, improve the heat insulation effect of the end plate, and further reduce the heat exchange between the end battery cells and the side wall of the housing.

[0010] In some embodiments, the housing includes a housing body, a top cover, and a bottom cover, the top cover and the bottom cover being disposed at both ends of the housing body along the first direction, and the electrode terminals being disposed on the top cover;

[0011] The end plate is disposed on the shell body, and the cavity is disposed through the end plate along the first direction;

[0012] The first direction and the second direction are intersecting.

[0013] The shell also includes a top cover and a bottom cover, which are located at the two ends of the shell body along the first direction. Before connecting the top cover and the bottom cover, the receiving cavity of the shell body is connected along the first direction, and the cavity is also configured to connect the end plate along the first direction. This allows the end plate and the shell body to be integrally formed by extrusion molding, so as to simultaneously form the cavity and the receiving cavity, which greatly reduces the molding difficulty of the cavity in the end plate.

[0014] In some embodiments, the shell body and the end plate are integrally formed, and the top cover and the bottom cover are respectively welded to the shell body.

[0015] The welding method used to connect the top cover, bottom cover and shell body not only ensures the airtightness of the internal cavity of the shell body, but also provides sufficient connection strength to resist the expansion of the internal electrode assembly.

[0016] Secondly, this application also proposes a battery device comprising a plurality of battery cells stacked in a second direction in at least one column, wherein the column of battery cells includes end battery cells located at both ends in the second direction, and the end battery cells include the aforementioned end battery cells.

[0017] The technical solution provided in this application provides end battery cells at both ends of a row of multiple battery cells. The end battery cells can fix the row of battery cells by means of end plates integrally provided on their housings, thereby suppressing the expansion and deformation of the row of battery cells and reducing the probability of the battery cells being damaged due to excessive expansion.

[0018] In some embodiments, the battery device further includes cable ties that are fitted around the periphery of a row of battery cells and are disposed corresponding to the end plates of the end battery cells.

[0019] The method of binding the end plates of the battery cells at the corresponding ends with cable ties around the periphery of multiple battery cells in a row can effectively fix the multiple battery cells in a row and prevent them from being displaced or damaged due to vibration or impact during vehicle operation.

[0020] In some embodiments, the housing of the end battery cell includes a top cover and a bottom cover opposite each other along a first direction;

[0021] Multiple cable ties are provided and distributed in the first direction;

[0022] The first direction and the second direction are intersecting.

[0023] The arrangement of multiple cable ties along the first direction on the end battery cell can further improve the fixing effect of the cable ties on multiple battery cells in a row, and can distribute the binding force to various positions along the first direction of the end plate through multiple cable ties, thereby reducing the local pressure on the end plate and lowering the structural strength requirements of the end plate.

[0024] In some embodiments, the end plate has two binding ends in a third direction, the binding ends protruding laterally from the housing of the end battery cell;

[0025] The cable tie is wrapped around the binding side end;

[0026] The second direction is set to intersect with the third direction.

[0027] Since the binding ends are located at both ends of the end plate along the third direction, and the binding ends also protrude from the side of the shell, the binding force applied by the cable tie after it wraps around the two end plates at both ends is mainly borne by the binding ends, which reduces the risk of deformation of the side wall of the shell due to the binding force.

[0028] In some embodiments, a heat insulation pad is provided between two adjacent battery cells.

[0029] The thermal insulation pad placed between two adjacent battery cells can play a role in thermal protection. When one battery cell experiences thermal runaway, the thermal insulation pad between the battery cells can effectively block the heat from being transferred and diffused to the adjacent battery cells, thereby preventing the domino effect of thermal runaway between multiple battery cells in the battery device.

[0030] In some embodiments, the heat insulation pad includes a rubber pad.

[0031] The use of rubber pads for heat insulation not only provides heat insulation but also utilizes the elasticity of rubber to cushion the expansion and contraction of battery cells during charging and discharging, thus improving the compression resistance of battery cells. Furthermore, rubber pads also have insulating properties, providing insulation protection between adjacent battery cells.

[0032] Thirdly, this application also proposes an electrical device that includes the aforementioned battery device, which is used to provide electrical energy. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 A simplified structural diagram of an embodiment of an electrical device provided in this application, which is a vehicle;

[0035] Figure 2 An exploded structural diagram of an embodiment of the battery device provided in this application;

[0036] Figure 3 A schematic diagram of the stacked structure of multiple battery cells in the battery device provided in this application;

[0037] Figure 4 for Figure 3 A top view of the structure of multiple battery cells;

[0038] Figure 5 for Figure 3 A schematic diagram showing the exploded structure of multiple battery cells;

[0039] Figure 6 for Figure 5 A schematic diagram of the structure of a single battery cell in the middle section;

[0040] Figure 7 for Figure 6 A schematic diagram of the exploded structure of a single battery cell in the middle section;

[0041] Figure 8 for Figure 7 A top view of the main body of the middle shell and the end plates.

[0042] Explanation of icon numbers:

[0043] 1000, vehicles;

[0044] 100. Battery assembly; 200. Controller; 300. Motor;

[0045] 1. Battery cell; 1a. End battery cell; 11. Housing; 11a. Receiving cavity; 111. Housing body; 112. Top cover; 113. Bottom cover; 114. Electrode terminal; 12. End plate; 12a. Cavity; 121. Binding side end; 1b. Middle battery cell; 2. Box body; 2a. Mounting cavity; 21. Box body; 22. Box cover; 3. Cable tie; 4. Heat insulation pad;

[0046] X, first direction; Y, second direction; Z, third direction.

[0047] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0053] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] In existing new energy vehicles, the power battery pack is a very important energy supply system. During long-term charge and discharge cycles, the lithium insertion and extraction process causes the graphite and ternary materials in the electrode components of the battery cells to expand and contract. This makes the battery module, which is composed of multiple stacked battery cells, prone to large deformation. Moreover, the battery cells may push against each other under the action of expansion force. If the external constraint force of the battery module is insufficient or the rigidity is insufficient, the welding points between the busbars and terminals of the battery cells may fall off, leading to failure. Traditional end plate structures are difficult to suppress the expansion and deformation of the battery module, thus having an adverse effect on the power battery pack.

[0056] Analysis of the causes of the above problems shows that the battery module mainly relies on the end plate structure to suppress the expansion force of the battery cells. Due to size limitations and the requirements for the utilization rate of internal space of the power battery pack, the thickness of the end plate structure is often limited to a small range. Under the action of large expansion force, the end plate structure may also deform and fail.

[0057] Further analysis reveals that a heat insulation pad is typically placed between the end plate structure and the battery cell. The presence of this heat insulation pad increases the overall size of the battery module and effectively separates the end plate structure from the battery cell. It is worth considering changing the existing structural layout by directly molding the end plate structure onto the battery cell's shell. Compared to a separate end plate structure and battery cell, an integrated end plate structure and battery cell design can combine the end plate wall with the battery cell's shell wall, thereby improving the deformation resistance of both.

[0058] The battery device disclosed in this application can be used to provide electrical energy to electrical devices, which can be, but are not limited to, electric vehicles, electric cars, ships, spacecraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0060] Please refer to Figure 1 , Figure 1 This application provides a simplified structural diagram of an embodiment of an electrical device used in a vehicle. The vehicle 1000 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 battery device 100 is internally installed in the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0061] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] To facilitate understanding of the battery device 100 provided in this application, the following description is provided in conjunction with the accompanying drawings, wherein... Figure 1 A simplified structural diagram of an embodiment of an electrical device provided in this application, which is a vehicle; Figure 2 An exploded structural diagram of an embodiment of the battery device provided in this application; Figure 3 A schematic diagram of the stacked structure of multiple battery cells in the battery device provided in this application; Figure 4 for Figure 3 A top view of the structure of multiple battery cells; Figure 5 for Figure 3 A schematic diagram showing the exploded structure of multiple battery cells; Figure 6 for Figure 5 A schematic diagram of the structure of a single battery cell in the middle section; Figure 7 for Figure 6 A schematic diagram of the exploded structure of a single battery cell in the middle section; Figure 8 for Figure 7 A top view of the main body of the middle shell and the end plates.

[0063] By applying the end cell provided in this application to the battery device 100, the problem of traditional end plate structures being unable to suppress the expansion and deformation of the battery module can be improved.

[0064] Please see Figures 3 to 6 In one embodiment of this application, the end battery cell 1a includes a housing 11, an electrode assembly and an electrode terminal 114. The electrode assembly is disposed inside the housing 11. The housing 11 is provided with an electrode terminal 114 at least at one end along the first direction X. The electrode terminal 114 is electrically connected to the electrode assembly. An end plate 12 is integrally formed on one side wall of the housing 11 along the second direction Y. The first direction X and the second direction Y are intersected.

[0065] It should be noted that the structure of the terminal battery cell 1 typically includes a housing 11, an electrode assembly, and an electrode terminal 114. The housing 1 typically has a receiving cavity 11a, and the electrode assembly is installed in the receiving cavity 11a (the structure of the electrode assembly is not shown in the accompanying drawings, but in the actual product, the electrode assembly is installed in the housing 11). The electrode assembly is led out to the outside of the housing 11 through the electrode terminal 114 provided on the shell wall of the housing 11 to connect to the busbar of the battery device 100.

[0066] An "electrode assembly" typically consists of a positive electrode, a negative electrode, and a separator. Lithium-ion electrode assemblies primarily function by the repeated insertion and extraction of lithium ions between the positive and negative electrodes. Currently, the main positive electrode materials used in lithium-ion electrode assemblies include lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium nickel oxide (LiNiO2), and lithium iron phosphate (LiFePO4). The separator is positioned between the positive and negative electrodes to form a three-layer thin-film structure. This structure is generally formed into an electrode assembly of the desired shape through winding or stacking. For example, the three-layer thin-film structure within the casing of a cylindrical battery cell is wound into a cylindrical electrode assembly, while the three-layer thin-film structure within the casing of a square battery cell is wound or stacked into an electrode assembly with a roughly cuboid shape. To correspond to the positive and negative electrodes of the electrode assembly, the electrode terminal 114 typically includes two contact portions to connect to the positive and negative electrodes respectively.

[0067] "The housing 11 is provided with an electrode terminal 114 at at least one end along the first direction X" includes the housing 11 being provided with an electrode terminal 114 at one end along the first direction X (the two energized portions of the electrode terminal 114 are provided at the same end), and the housing 11 being provided with an electrode terminal 114 at both ends along the first direction X (the two energized portions of the electrode terminal 114 are provided at different ends). Since the electrode terminals 114 of the end battery cell 1a are located at the end of its housing along the first direction X, the end battery cell 1a can be stacked with other battery cells 1 along the second direction. Due to the presence of the end plate 12, the end battery cell 1a is generally located at the end of a row of battery cells 1 stacked along the second direction. It should be noted that the first direction X, the second direction Y and the third direction Z mentioned in the following embodiments are usually three directions that intersect each other in three-dimensional space. The angle between two adjacent directions is usually 90 degrees, that is, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. However, it is not limited to this. The angle between two adjacent directions may also be any other angle value. For example, after the battery device 100 to which the end battery cell 1a belongs is correctly installed to the bottom of the vehicle 1000, the second direction Y can be the front-rear direction of the vehicle 1000, and the first direction X can be the up-down direction of the vehicle 1000. Of course, depending on the installation position of the battery device 100 on the vehicle 1000, the orientation of the first direction X, the second direction Y and the third direction Z may also be different.

[0068] An end plate 12 is integrally formed on one side wall of the housing 11 of the end battery cell 1a along the second direction Y. It is worth mentioning that there are various ways to integrally form the end plate 12 and the housing 11. For example, the end plate 12 and the housing 11 can be directly formed from the same sheet material by machining, or they can be indirectly formed by welding. In this embodiment, it is only necessary to ensure that the end plate 12 and the housing 11 have higher structural strength after integral forming, and the specific forming method is not limited. In this embodiment, the specific structural type of the end plate 12 is also not limited, as long as the end plate 12 can correspond to the electrode assembly in the housing 11 in the second direction Y to suppress the expansion force of the electrode assembly.

[0069] The technical solution provided in this application provides that the end plate 12 is provided on one side wall of the shell 11 of the end battery cell 1a along the second direction Y. On the basis of meeting the overall thickness requirements of the shell 11 and the end plate 12 along the second direction Y, the end plate 12 is integrally formed with the side wall of the shell 11, which is equivalent to improving the structural strength of the end plate 12. When the end battery cell 1a is arranged at the end of a row of multiple battery cells 1 along the second direction Y, it can fix a row of battery cells 1, effectively suppress the expansion deformation of a row of multiple battery cells 1, and reduce the probability of the battery cells 1 being damaged due to excessive expansion.

[0070] Please see Figures 6 to 8 In some embodiments, a cavity 12a is formed within the end plate 12.

[0071] It should be noted that the formation of cavity 12a requires a prerequisite: the structural strength of end plate 12 must be sufficient to suppress the expansion and deformation of battery cell 1. The location, number, and size of cavity 12a can vary, and can be determined based on mechanical simulation. For example, cavity 12a can be positioned away from the opening of housing 11 along the second direction Y, or it can penetrate along the first direction X or a third direction. The number of cavities 12a can be a single cavity in the middle of end plate 12, or they can be arranged along the entire end plate 12, and can be divided into multiple cavities by multiple stiffeners within the extension plane of end plate 12. Figure 8 As shown.

[0072] According to the above technical solution, while satisfying the structural strength of the end plate 12 and the housing 11, a cavity 12a is formed in the end plate 12, which aims to reduce the overall mass of the end plate 12 and the housing 11, thereby improving the energy density of the battery device 100.

[0073] In some embodiments, the cavity 12a is filled with a heat insulation element.

[0074] It should be noted that in conventional battery modules, a heat insulation pad 4 is usually required between the end plate and the corresponding battery cell 1 to limit heat exchange between the end plate and the battery cell 1. This is beneficial for the thermal management system to uniformly manage the temperature of each battery cell 1. Obviously, in this embodiment, since the end plate 12 and the side wall of the housing 11 are integrally formed, the heat insulation pad 4 that originally needed to be set between the end plate 12 and the housing 11 can be omitted, thereby reducing the overall size of a row of battery cells 1 along the second direction Y.

[0075] The function of the "heat insulation component" is to fill the cavity 12a of the end plate 12 to limit the conduction of heat along the second direction Y on the end plate 12. The heat insulation component can achieve the purpose of heat insulation through various structural designs or material selections. For example, the heat insulation component can be selected as heat insulation foam, which is injected into the cavity 12a to achieve the purpose of heat insulation and buffer support. This embodiment does not limit the specific structural type and material of the heat insulation component.

[0076] According to the above technical solution, since the end plate 12 and the side wall of the housing 11 are integrally formed, the setting of the heat insulation pad 4 can be reduced, which is equivalent to reducing the overall size of multiple battery cells 1 in a row, which is beneficial to improving the energy density of the battery device 100. Moreover, the heat insulation component set in the cavity 12a of the end plate 12 can limit the heat conduction along the second direction Y on the end plate 12, improve the heat insulation effect of the end plate 12, and further reduce the heat exchange between the end battery cells 1a and the side wall of the housing 2.

[0077] Please see Figure 7 In some embodiments, the housing 11 includes a housing body 111, a top cover 112 and a bottom cover 113. The top cover 112 and the bottom cover 113 are disposed at both ends of the housing body 111 along the first direction X. The electrode terminal 114 is disposed on the top cover. The end plate 12 is disposed on the housing body 111, and the cavity 12a is disposed through the end plate 12 along the first direction X. The first direction X intersects with the second direction Y.

[0078] It should be noted that "shell body 111" refers to the main component of shell 11, and the receiving cavity 11a of shell 11 is usually formed in shell body 111; "top cover 112 and bottom cover 113" are provided at both ends of shell body 111 along the first direction X, thereby covering the openings on both sides of receiving cavity 11a to seal receiving cavity 11a. It is worth mentioning that in the production process of end battery cell 1a, "top cover 112" usually needs to be pre-integrated with electrode assembly and electrode terminal 114. After the electrode assembly is installed into receiving cavity 11a, top cover 112 is connected to shell body 111. The connection method of top cover 112, bottom cover 113 and shell body 111 can usually be connected into one piece after receiving cavity 11a is formed in shell body 111. The connection method may be adhesive or snap-fit ​​connection. This embodiment does not limit the specific connection method, but reliable connection strength and sealing are required.

[0079] Since "the cavity 12a of the end plate 12 is provided to penetrate the end plate 12 along the first direction X", before the top cover 112 and the bottom cover 113 are connected to the shell body 111, the cavity 12a and the receiving cavity 11a respectively penetrate the end plate 12 and the shell body 111 along the first direction X. At the same time, since the end plate 12 and the shell body 111 are integrally formed, the "cavity 12a" is given more forming possibilities. For example, the shell body 111 and the end plate 12 can be integrally formed by extrusion molding process, and the receiving cavity 11a and the cavity 12a can be formed at the same time. The material of the end plate 12 and the shell body 111 can be uniformly selected as aluminum alloy (of course, the material of the top cover 112 and the bottom cover 113 can also be selected as aluminum alloy). After the extrusion molding process, specific configurations can also be processed on the end plate 12 and the shell body 111 by CNC machining process.

[0080] According to the above technical solution, the shell 11 also includes a top cover 112 and a bottom cover 113. The top cover 112 and the bottom cover 113 are respectively located at both ends of the shell body 111 along the first direction X. Before connecting the top cover 112 and the bottom cover 113, the receiving cavity 11a of the shell body 111 is through the first direction X, and the cavity 12a is also configured to pass through the end plate 12 along the first direction X. This allows the end plate 12 and the shell body 111 to be integrally formed by extrusion molding, so as to simultaneously form the cavity 12a and the receiving cavity 11a. This greatly reduces the molding difficulty of the cavity 12a in the end plate 12.

[0081] In some embodiments, the shell body 111 and the end plate 12 are integrally formed, and the top cover 112 and the bottom cover 113 are respectively welded to the shell body 111.

[0082] According to the above technical solution, the top cover 112, bottom cover 113 and shell body 111 are connected by welding, which not only ensures the sealing of the cavity 12a inside the shell body 111, but also helps to provide sufficient connection strength to resist the expansion of the internal electrode assembly.

[0083] Secondly, please refer to Figures 2 to 5 This application also proposes a battery device 100, which includes a plurality of battery cells 1. The plurality of battery cells 1 are stacked in a second direction Y to form at least one column. The column of battery cells 1 includes end battery cells 1a located at both ends in the second direction Y. The specific structure of the end battery cells 1a is as described in the above embodiments. Since this battery device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0084] It should be noted that "multiple battery cells 1 are stacked in the second direction Y as at least one column" can be understood as multiple battery cells 1 being stacked in the second direction Y as only one column, or multiple battery cells 1 including two, three or more columns arranged in the third direction, with the two battery cells 1 at both ends of each column along the second direction Y being set as end battery cells 1a.

[0085] Multiple battery cells 1 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple battery cells 1 can be connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a hybrid configuration to form a battery assembly. Alternatively, multiple battery cells 1 can be first connected in series, parallel, or in a hybrid configuration to form a battery module (e.g., multiple battery cells 1 stacked in a row), and then the battery modules can be connected in series, parallel, or in a hybrid configuration to form a battery assembly (e.g., multiple rows of battery cells 1 arranged in multiple columns). The battery device 100 may also include other structures, such as a busbar component for electrical connection between multiple battery cells 1 or multiple battery modules. Each battery cell 1 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. A battery cell 1 can be cylindrical, flat, cuboid, or other shapes.

[0086] The battery cell 1 located between the two end battery cells 1a can be understood as the intermediate battery cell 1b. This application does not limit the specific structure of the intermediate battery cell 1b, but its quantity is typically set to multiple, such as... Figure 3 and Figure 4 As shown.

[0087] The technical solution provided in this application provides end battery cells 1a at both ends of a row of multiple battery cells 1. The end battery cells 1a can fix the row of battery cells 1 by means of the end plate 12 integrally provided on its housing 11, thereby suppressing the expansion and deformation of the row of battery cells 1 and reducing the probability of the battery cells 1 being damaged due to excessive expansion.

[0088] Typically, the battery device 100 also needs to load multiple battery cells 1 through the housing 2, such as Figure 2 As shown, the housing 2 is the main mounting component of the battery device 100. The battery device 100 is mainly installed to the vehicle 1000 through the housing 2, and the battery cells 1 are installed through the mounting cavity 2a inside the housing 2. The basic structure of the housing 2 generally includes a housing body 21 and a housing cover 22. The housing cover 21 is set on the housing body 21 and together with the housing body 21 defines the housing 2a. Generally speaking, the battery cells 100 are generally set in the housing body 21. After the battery device 100 is mounted to the vehicle 1000, the housing cover 22 is generally close to the vehicle body. In vehicle 1000, the main body 21 of the box is generally away from vehicle 1000; the mounting cavity 2a can be mainly formed in the main body 21. In this case, the main body 21 can be understood as a basin-shaped structure. The box cover 22 is placed on the main body 21 to cover the mounting cavity 2a; the mounting cavity 2a can also be mainly formed in the box cover 22. In this case, the box cover 22 can be understood as a cover-shaped structure. The box cover 22 is placed on the main body 21 to cover the battery cell 1 mounted on the main body 11 into the box cover 22. Of course, the structure of the box 2 is not limited to this. This embodiment does not limit it.

[0089] Generally speaking, the structure of the housing 2 is relatively strong. Therefore, the side walls of the housing 2 can be used to limit and stop the multiple battery cells 1 in a row. In some embodiments, the multiple battery cells 1 in a row are arranged in the mounting cavity 2a of the housing 2 along the second direction Y, and the end plates 12 on the two end battery cells 1a at both ends abut against the two opposite side walls of the housing 2 along the second direction.

[0090] According to the above technical solution, multiple battery cells 1 in a row abut against the side wall of the housing 2 through the end plates 12 on both sides. While meeting the overall size requirements of multiple battery cells 1 in a row, the structural strength of the end plate 12 is improved because it is integrally formed with the side wall of the housing 11 in the end battery cell 1a. This can effectively suppress the expansion and deformation of multiple battery cells 1 in a row and improve the reliability of the battery device 100.

[0091] Please see Figure 3 and Figure 5 In some embodiments, the battery device 100 further includes a cable tie 3, which is sleeved around the periphery of a row of battery cells 1 and is provided corresponding to the end plate 12 of the end battery cell 1a.

[0092] It should be noted that the function of the cable tie 3 is to bind multiple battery cells 1. Its material is typically a high-strength alloy; for example, the cable tie 3 can usually be made of stainless steel or other high-strength steel. The cable tie 3 is usually pre-formed into a closed loop. During installation, multiple battery cells 1 typically require initial pressure to ensure that their overall dimensions along the second direction Y meet the requirements. After the cable tie 3 is placed around the periphery of the multiple battery cells 1, the pressure is released, thus securing the multiple battery cells 1 in place. "The cable tie 3 is placed around the periphery of a row of battery cells 1" can be understood as the cable tie 3 being placed around the periphery of a row of battery cells 1 along other directions intersecting the second direction Y, for example... Figure 5 In this configuration, cable ties 3 are fitted around the periphery of a row of battery cells 1 along the first direction X. Alternatively, cable ties 3 can also be fitted around the periphery of a row of battery cells 1 along the third direction Z. The phrase "cable ties 3 are set at the end plates 12 corresponding to the end battery cells 1a" can be understood as cable ties 3 being set around the corresponding end plates 12 at both ends along the second direction Y. Figure 3 As shown.

[0093] According to the above technical solution, the multiple battery cells 1 in a row are effectively fixed by the cable tie 3 being tied to the end plate of the corresponding end battery cell 1a on the periphery of the row, preventing them from being displaced or damaged due to vibration or impact during vehicle operation.

[0094] Please see Figure 3 In some embodiments, the housing 11 of the end battery cell 1a includes a top cover 112 and a bottom cover 113 opposite to each other along a first direction X; multiple cable ties 3 are provided and distributed in the first direction X; wherein the first direction X intersects with the second direction Y.

[0095] The above embodiments have already explained the "top cover 112 and bottom cover 113" and the "second direction Y and first direction X", and this embodiment will not repeat them.

[0096] According to the above technical solution, multiple cable ties 3 are arranged along the first direction X on the end battery cell 1a, which can further improve the fixing effect of the cable ties 3 on multiple battery cells 1 in a row, and can distribute the binding force to various positions of the end plate 12 along the first direction X through the multiple cable ties 3, thereby reducing the local pressure that the end plate 12 needs to bear and reducing the structural strength requirements of the end plate 12.

[0097] Please see Figure 3 and Figure 8 In some embodiments, the end plate 12 has two binding side ends 121 located in the third direction Z, the binding side ends 121 protruding from the side of the housing 11 of the end battery cell 1a; the cable tie 3 is wrapped around the binding side ends 121; wherein the second direction Y intersects with the third direction Z.

[0098] It should be noted that "binding side end 121" refers to the end of the end plate 12 located in the third direction Z. "Binding side end 121 protruding from the side of the housing 11" can be understood as the binding side end 121 protruding from the side of the housing 11 in the third direction Z. When the cable tie 3 wraps around multiple battery cells 1 along the circumference of the first direction X, it needs to wrap around the binding side end 121 of the end plate 12.

[0099] The relative relationships between the first direction X, the second direction Y, and the third direction Z have been explained above, and will not be repeated in this embodiment.

[0100] According to the above technical solution, since the binding side ends are located at both ends of the end plate 12 along the third direction Z, and the binding side ends 121 protrude from the side of the shell 11, the binding force applied by the cable tie 3 after passing around the two end plates 12 at both ends is mainly borne by the binding side ends 121, which reduces the risk of deformation of the side wall of the shell 11 due to the binding force.

[0101] Please see Figure 5 In some embodiments, a heat insulation pad 4 is provided between two adjacent battery cells 1.

[0102] It should be noted that the function of the "heat insulation pad 4" is to be placed between two adjacent battery cells 1 to limit the conduction of heat between the two adjacent battery cells 1. The heat insulation pad 4 can achieve the purpose of heat insulation through various structural designs or material selections. For example, the heat insulation pad 4 can be selected as heat insulation foam. This embodiment does not limit the specific structural type and material of the heat insulation pad 4. It is worth mentioning that the two adjacent battery cells 1 may include the end battery cell 1a.

[0103] According to the above technical solution, a heat insulation pad 4 is set between two adjacent battery cells 1, which can play a role in thermal protection. When one of the battery cells 1 experiences thermal runaway, the heat insulation pad 4 between the battery cells 1 can effectively block its heat from being transferred and diffused to the adjacent battery cells 1, thereby preventing the domino effect of thermal runaway between multiple battery cells 1 in the battery device 100.

[0104] In some embodiments, the heat insulation pad 4 includes a rubber pad.

[0105] It should be noted that the "rubber pad" is made of rubber, which usually has good heat insulation, insulation and elasticity properties, which will not be elaborated in this embodiment.

[0106] According to the above technical solution, the heat insulation pad 4 is set as a rubber pad, which can not only play a heat insulation role, but also play a certain buffer role by utilizing the elastic properties of the rubber pad to offset the expansion and contraction changes of the battery cell 1 during the charging and discharging process, and improve the compression resistance of the battery cell 1. Moreover, the rubber pad also has insulating properties, which can play an insulating protection role between two adjacent battery cells 1.

[0107] This application also proposes an electrical device including a battery device 100 for providing electrical energy. The specific structure of the battery device 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. The battery device 100 is used to provide electrical energy to the electrical device, which includes, but is not limited to, new energy vehicles such as pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, and may also include aircraft such as electric drones and electric passenger aircraft.

[0108] This application proposes a battery device 100, which includes a housing 2 and a plurality of battery cells 1 arranged in the housing 2 along a second direction Y. The plurality of battery cells 1 include end battery cells 1a at both ends. The end battery cells 1a include a housing 11 and an electrode assembly disposed in the housing 11. The housing 11 includes a housing body 111, a top cover 112 and a bottom cover 113. An end plate 12 is integrally formed on one side wall of the housing body 111 along the first direction X. The top cover 112 and the bottom cover 113 are welded to the two ends of the housing body 111 along the first direction X. An electrode terminal 114 is disposed on the top cover 112 and is electrically connected to the electrode assembly. A plurality of cavities 12a are formed in the end plate 12 and are disposed through the end plate 12 along the first direction X. A plurality of cable ties 3 are tied around the periphery of a row of battery cells 1 and are distributed in the first direction X corresponding to the end plates 12 of the end battery cells 1a.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An end cell, characterized by, The battery device comprises a shell, an electrode assembly and an electrode terminal. The electrode assembly is arranged in the shell. The shell is provided with the electrode terminal at at least one end in a first direction. The electrode terminal is electrically connected with the electrode assembly. An end plate is integrally formed on a side wall of the shell in a second direction. The first direction and the second direction are arranged intersectingly.

2. The end cell as claimed in claim 1, wherein, The end plate is provided with a cavity.

3. The end cell as claimed in claim 2, wherein, The cavity is filled with a thermal insulation member.

4. The end cell as claimed in claim 2, wherein, The shell comprises a shell body, a top cover and a bottom cover. The top cover and the bottom cover are arranged at both ends of the shell body in the first direction. The electrode terminal is arranged on the top cover. The end plate is arranged on the shell body. The cavity is arranged through the end plate in the first direction. The first direction and the second direction are arranged intersectingly.

5. The end cell as defined in claim 4, wherein The shell body and the end plate are integrally formed. The top cover and the bottom cover are respectively welded with the shell body.

6. A battery device characterized by comprising: The battery device comprises a plurality of battery monomers. The plurality of battery monomers are arranged in at least one column in a second direction. The battery monomers in one column comprise end battery monomers at both ends in the second direction. The end battery monomers comprise the end battery monomers according to any one of claims 1 to 5.

7. The battery device of claim 6, wherein The battery device further comprises a tie. The tie is sleeved on the circumferential side of the battery monomers in one column and corresponds to the end plate of the end battery monomers.

8. The battery device of claim 7, wherein, The shell of the end battery monomer comprises a top cover and a bottom cover opposite in the first direction. The tie is provided in plurality and is distributed in the first direction. The first direction and the second direction are arranged intersectingly.

9. The battery device of claim 7, wherein The end plate has two binding side ends in a third direction. The binding side ends protrude from the side of the shell of the end battery monomer. The tie is wound around the binding side ends. The second direction and the third direction are arranged intersectingly.

10. An electric device, characterized by The battery device according to any one of claims 6 to 9 is used for providing electric energy.

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