Battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a single battery, a battery device, an energy storage device and a power utilization device, the single battery comprises a shell and an electrode assembly, and the shell is provided with an accommodating cavity; the electrode assembly is accommodated in the accommodating cavity; the shell comprises two first walls oppositely arranged in the first direction, at least one first wall comprises a body structure and a clamping structure arranged on the side, back to the containing cavity, of the body structure, and the clamping structures of the battery monomers are used for clamping the clamping structures of the adjacent battery monomers. According to the battery monomer, the battery device, the energy storage device and the power utilization device provided by the invention, the production efficiency of grouping operation of a plurality of battery monomers is improved, so that the production efficiency of the battery device comprising the plurality of battery monomers is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, battery devices, energy storage devices and power-consuming devices. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] With the continuous development of battery technology, the industry continues to put forward higher requirements on battery production efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery device, an energy storage device and an electrical device that can improve production efficiency.

[0005] This application is implemented through the following technical solutions.

[0006] The first aspect of the present application provides a battery cell, comprising: a shell, the shell having a accommodating cavity; an electrode assembly, accommodated in the accommodating cavity; wherein the shell comprises two first walls arranged opposite to each other along a first direction, at least one of the first walls comprises a main body structure and a snap-fit ​​structure arranged on a side of the main body structure facing away from the accommodating cavity, the snap-fit ​​structure of the battery cell is used to snap-fit ​​the snap-fit ​​structure of an adjacent battery cell; the snap-fit ​​structure comprises protruding structures arranged in sequence and at intervals along a second direction intersecting the first direction, a groove structure is formed between the protruding structures and the main body structure adjacent to each other along the second direction, the groove structure and the protruding structure of the battery cell are used to respectively snap-fit ​​the protruding structure and the groove structure of the adjacent battery cell.

[0007] The embodiment of the present application configures at least one first wall of a battery cell to have a snap-fitting structure so that the battery cells can be snapped together through their respective snap-fitting structures, thereby achieving connection between the battery cells. This can eliminate the surface cleaning process required when using a gluing process, and can also shorten the offline time when using structural adhesive bonding, thereby helping to improve the production efficiency of grouping multiple battery cells, thereby improving the production efficiency of a battery device comprising multiple battery cells.

[0008] In addition, two adjacent battery cells are engaged with each other through their respective protrusion structures and groove structures, which improves the reliability of the connection between the battery cells. A reliable connection can not only reduce the chance of damage to the battery cells due to shaking and extend their service life, but also improve the smoothness of current transmission between battery cells, reduce energy loss and improve energy utilization.

[0009] In some embodiments, the inner wall of the groove structure includes a groove bottom wall and two groove side walls respectively connected to the two ends of the groove bottom wall along the second direction. In the second direction, the minimum spacing between the two groove side walls is greater than the spacing between one end of the two groove side walls connected to the groove bottom wall.

[0010] In this way, the space between at least the position where the two groove side walls are at the smallest spacing and the groove bottom wall can constrain the relative movement of the protruding structure entering the groove structure along the first direction and the relative movement along the second direction, thereby achieving engagement.

[0011] In some embodiments, in the second direction, the distance between the two groove side walls gradually decreases from an end close to the groove bottom wall to an end far from the groove bottom wall.

[0012] In this way, the distance between the edges of the two groove side walls away from the groove bottom wall is minimized, making the groove structure and the protrusion structure more securely engaged, thereby improving the reliability of the connection between the battery cells. A secure connection can not only reduce the chance of damage to the battery cells due to shaking and extend their service life, but also improve the smoothness of current transmission between battery cells, reduce energy loss, and improve energy utilization.

[0013] In some embodiments, the groove structure extends along a third direction intersecting both the first direction and the second direction, and the groove structure is formed with a snap-in opening on at least one of two opposite surfaces of the first wall along the third direction.

[0014] In this way, the protruding structure of the battery cell enters the groove structure through the insertion opening of the groove structure of the adjacent battery cell along the third direction, and the two battery cells are engaged after the protruding structure is fully engaged in the groove structure. The engagement operation is convenient to operate and is conducive to improving the grouping efficiency between battery cells.

[0015] In some embodiments, the two first walls of the same battery cell both include the main body structure and the protrusion structure and the groove structure arranged on the side of the main body structure facing away from the accommodating cavity, the protrusion structures of the two first walls of the same battery cell are arranged opposite to each other in the first direction, and the groove structures of the two first walls of the same battery cell are arranged opposite to each other in the first direction; or, the protrusion structure of one of the two first walls of the same battery cell and the groove structure of the other are arranged opposite to each other in the first direction.

[0016] Thus, by providing the protrusion structure and the groove structure on both first walls of the battery cell, the battery cell can be clamped on both opposite sides of the battery cell along the first direction, so that more than three battery cells can be grouped to increase the capacity.

[0017] In some embodiments, a flow channel for the heat exchange medium to flow is provided in the protrusion structure and / or the main body structure.

[0018] By arranging the flow channel in the protruding structure and / or the main body structure, the flow channel is formed on the first wall, and there is no need to arrange a heat exchange plate on the outside of the shell, which saves space and helps to improve the volume energy density.

[0019] In some embodiments, the flow channel is disposed in the main body structure, and a dimension of the main body structure along the first direction is in the range of 4 mm to 6 mm.

[0020] In this way, by limiting the size of the main body structure along the first direction to be in the range of 4 mm to 6 mm, the flow channel can be sufficiently arranged in the main body structure, and the thickness of the first wall will not be too large.

[0021] In some embodiments, along the second direction, a ratio between a maximum dimension of the groove structure and a maximum dimension of the protrusion structure is in a range of 2.5 to 3.

[0022] In this way, when the flow channel is provided in the main body structure, the protrusion structure may not be provided with a flow channel, and there is no need for a larger size, and it may be provided relatively small. Therefore, by setting the above ratio, the groove structure is provided relatively large, and the protrusion structure is provided relatively small, which is beneficial to reducing the consumables of the protrusion structure and the material cost. Moreover, the above size of the protrusion structure meets the strength requirement of the engaging groove structure.

[0023] In some embodiments, the flow channel is disposed in the protruding structure, and a dimension of the main body structure along the first direction is in the range of 1 mm to 1.5 mm.

[0024] Since the flow channel is arranged in the protruding structure, the main body structure may not be provided with the flow channel, and the main body structure may be set to be relatively thin. Therefore, the dimension of the main body structure along the first direction X is set to be in the range of 1mm~1.5mm, so that the thickness of the main body structure is thinner, which is conducive to reducing the overall thickness of the first wall. Moreover, this range also meets the strength requirements of the main body structure.

[0025] In some embodiments, along the second direction, a ratio between a maximum dimension of the protrusion structure and a maximum dimension of the groove structure is in a range of 2.5 to 3.

[0026] Since the flow channel is arranged in the protrusion structure, the protrusion structure needs to have a sufficiently large size to set the flow channel. Therefore, the ratio between the maximum size of the protrusion structure along the second direction and the maximum size of the groove structure is set in the range of 2.5~3, which not only meets the size requirement of the protrusion structure to set the flow channel, but also does not make the groove structure too narrow to affect the clamping strength.

[0027] In some embodiments, a dimension of the protrusion structure along the first direction is in the range of 2.5 mm to 5 mm.

[0028] By limiting the size of the protrusion structure along the first direction to the range of 2.5mm~5mm, the strength requirements of the protrusion structure can be met, and the requirements for the reliability of the engagement between the protrusion structure and the groove structure can be met, and the overall thickness of the first wall will not be too large due to the large size of the protrusion structure.

[0029] In some embodiments, the protrusion structure is a shell-like structure having an inner cavity, and a tube body having the flow channel is disposed in the inner cavity of the protrusion structure; and / or, the main body structure is a shell-like structure having an inner cavity, and a tube body having the flow channel is disposed in the inner cavity of the main body structure.

[0030] The protruding structure and / or the main body structure is configured as a shell-like structure, which reduces the weight of the first wall, thereby reducing the weight of the battery cell, and also enables the first wall to have a buffering and energy absorption function, reducing the probability of the first wall being damaged by impact, thereby facilitating the improvement of the service life of the battery cell. A tube body having a flow channel is provided in the inner cavity of the protruding structure and / or the main body structure, so that the protruding structure and / or the main body structure is provided with a flow channel, thereby achieving thermal management of the battery cell.

[0031] In some embodiments, the protrusion structure and / or the inner cavity of the main body structure is provided with reinforcing ribs.

[0032] By providing reinforcing ribs, the structural strength of the protruding structure and / or the main body structure is improved, which is conducive to maintaining the shape of the first wall, thereby maintaining the locking state between the battery cells. This not only reduces the probability of damage to the battery cells due to shaking and extends the service life, but also improves the smoothness of current transmission between battery cells, reduces energy loss, and improves energy utilization.

[0033] In some embodiments, the tube body is welded to the shell wall of the shell-like structure; and / or the tube body is plugged into the shell wall of the shell-like structure.

[0034] In this way, the connection between the tube body and the main body structure and / or the protruding structure is achieved, so that a flow channel is provided in the main body structure and / or the protruding structure. In addition, the above connection method has simple connection operation and high connection strength.

[0035] In some embodiments, the tube body extends along a third direction intersecting both the first direction and the second direction, one end of the tube body is connected to the shell wall of the shell-like structure at one end along the third direction, and the other end of the tube body is connected to the shell wall of the shell-like structure at the other end along the third direction.

[0036] In this way, the connection between the tube body and the protrusion structure and / or the main body structure is achieved. Moreover, since the outer walls of the two ends of the protrusion structure along the second direction are the groove side walls of the groove structure, the protrusion structure needs to be accommodated in the groove structure. It is not easy to set up a pipeline for injecting or discharging the heat exchange medium here. For this reason, the tube body is set to extend along a third direction that intersects both the first direction and the second direction, so as to facilitate the installation arrangement of the pipeline for injecting or discharging the heat exchange medium.

[0037] In some embodiments, along the third direction, end surfaces of both ends of the protrusion structure are flush with end surfaces of both ends of the main body structure.

[0038] In this way, the structure of the first wall is neat, which is conducive to saving space, and is conducive to improving the reliability of the engagement between the battery cells, and the strength in the third direction is uniform, which can improve the structural strength of the shell. In addition, in the case where the flow channel is arranged in the protruding structure, it is arranged in this way so that the inlet and outlet of the flow channel are respectively located at the end faces of the first wall along the third direction, which is conducive to extending the length of the flow channel and improving the heat exchange effect.

[0039] In some embodiments, the shell also includes a second wall opposite to each other along the second direction and two third walls opposite to each other along the third direction, the two ends of the second wall are respectively connected to the two first walls, two openings opposite to each other along the third direction are formed between the two first walls and the two second walls, the two third walls respectively cover the two openings, and the size of the shell along the third direction is larger than the size along the second direction, and the size along the second direction is larger than the size in the first direction.

[0040] In this way, the first wall is the surface with the largest area of ​​the outer shell, that is, the first wall is a large surface, and the size of the first wall along the third direction is greater than the size along the second direction. The protrusion structure and the groove structure both extend along the third direction, so that the size of the protrusion structure and the groove structure are longer, which is beneficial to improve the clamping reliability between adjacent battery cells, and makes the length of the flow channel longer, thereby improving the heat exchange effect.

[0041] In some embodiments, a lubricating layer is provided on the outer surface of the protrusion structure and / or the inner wall of the groove of the groove structure.

[0042] By providing a lubricating layer on the outer surface of the protruding structure and / or the inner wall of the groove of the groove structure, the smoothness of the protruding structure sliding into the groove structure is improved, the smoothness of grouping between battery cells is improved, and the assembly efficiency is improved.

[0043] In some embodiments, the lubricating layer includes a fluoroplastic coating or a polyamide resin coating.

[0044] In some embodiments, the lubricating layer has a thickness ranging from 20 μm to 100 μm.

[0045] Such a thickness can meet the lubrication requirements without taking up too much space due to the lubrication layer being too thick.

[0046] In some embodiments, the main body structure and the engaging structure are formed as an integrally formed structure.

[0047] In this way, through integral molding, the overall strength of the first wall is improved, and the manufacturing efficiency is also improved.

[0048] A second aspect of the present application provides a battery device, comprising a plurality of battery cells provided by the first aspect.

[0049] Since the battery cells provided by the first aspect have high grouping efficiency, the manufacturing efficiency of the battery device including the battery cells is high.

[0050] A third aspect of the present application provides an energy storage device, which includes a plurality of battery cells provided by the first aspect or a plurality of battery devices provided by the second aspect, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0051] Since the battery cells provided in the first aspect have high grouping efficiency, the battery device provided in the second aspect has high manufacturing efficiency. Therefore, the energy storage device including the battery cells or the battery device has high manufacturing efficiency.

[0052] A fourth aspect of the present application provides an electrical device, which includes a plurality of battery cells provided by the first aspect or a plurality of battery devices provided by the second aspect, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0053] Since the battery cells provided in the first aspect have high grouping efficiency, the battery device provided in the second aspect has high manufacturing efficiency. Therefore, the manufacturing efficiency of the electric device including the battery cells or the battery device is high.

[0054] The beneficial effects of the embodiments of the present disclosure include: through the present application, a battery cell, a battery device, an energy storage device and an electrical device are provided that can improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0056] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0057] Figure 2 is a perspective exploded schematic diagram of a battery device according to one or more embodiments;

[0058] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments;

[0059] Figure 4 is a schematic diagram of a three-dimensional exploded structure of a battery cell according to one or more embodiments;

[0060] Figure 5 A partial schematic diagram of a structure of two interlocking battery cells according to one or more embodiments;

[0061] Figure 6 for Figure 5 The main view of the structure;

[0062] Figure 7 is a partial structural schematic diagram of a first structure of a battery cell according to one or more embodiments;

[0063] Figure 8 for Figure 7 The main view of the structure;

[0064] Fig. 9 is a partial structural schematic diagram of a second structure of a battery cell according to one or more embodiments;

[0065] Fig.10 for Fig. 9 The main view of the structure;

[0066] Fig.11 is a partial schematic diagram of another structure of two interlocking battery cells according to one or more embodiments;

[0067] Fig.12 is a partial structural schematic diagram of a third structure of a battery cell according to one or more embodiments;

[0068] Fig.13 is a partial structural schematic diagram of a fourth structure of a battery cell according to one or more embodiments;

[0069] Fig.14 For two Fig.13 A schematic diagram of a structure in which the middle structure is engaged;

[0070] Fig.15 for Fig.10 A cross-sectional view of the structure shown is formed by cutting along the plane where the first direction and the second direction are located.

[0071] Description of Reference Numerals

[0072] 1000 vehicle; 100 battery device; 200 controller; 300 motor; 10 housing; 20 battery cell; 101 first housing; 102 second housing; 1 shell; 1a first shell; 1b second shell; 11 first wall; 111 body structure; 110 snap-fit ​​structure; 112 protrusion structure; 113 groove structure; 1131 groove bottom wall; 1132 groove side wall; 1133 snap-in opening; 114 reinforcing rib; 115 tube; 1150 flow channel; 116 lubricating layer; 12 second wall; 13 third wall; 2 electrode assembly; 21 positive pole ear; 22 negative pole ear; 120 shell; 130 end cover; 3 pressure relief mechanism; 4 pole column; 5 adapter. DETAILED DESCRIPTION

[0073] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0075] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0076] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0081] Below, this application is described in detail.

[0082] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0083] The inventor of this application found that, at present, the main method of combining battery cells is gluing (structural adhesive / pressure-sensitive double-sided adhesive), and the processes involving gluing have requirements for surface cleanliness, so it is necessary to add a special section for surface cleaning to meet assembly requirements. If structural adhesive is used to bond two battery cells, in order to meet the needs of transportation or hoisting, the structural adhesive needs to reach a certain degree of solidification, which will also further increase the offline time of the module and affect the production efficiency of the battery.

[0084] After research, the inventors of the present application found that by forming a snap-fit ​​structure on the side wall of the battery cell, the battery cells are snapped together through the snap-fit ​​structure, which can eliminate the surface cleaning process and shorten the offline time of the solution using structural adhesive bonding, thereby improving the production efficiency of the entire production line.

[0085] Based on such a design concept, the inventor of the present application designed a battery cell, which includes a shell and an electrode assembly, the shell having a accommodating cavity; the electrode assembly is accommodated in the accommodating cavity; the shell includes two first walls arranged opposite to each other along a first direction, at least one first wall includes a main body structure and a snap-fit ​​structure arranged on a side of the main body structure facing away from the accommodating cavity, and the snap-fit ​​structure of the battery cell is used to snap-fit ​​the snap-fit ​​structure of an adjacent battery cell.

[0086] The present design provides at least one shell wall of a battery cell with a snap-fitting structure, so that the battery cells can be snapped together through their respective snap-fitting structures, thereby achieving connection between the battery cells. This can eliminate the surface cleaning process required when using an adhesive process, and can also shorten the offline time when using structural adhesive bonding, thereby improving the production efficiency of grouping multiple battery cells.

[0087] The battery cell provided in the embodiment of the present application can be used in, but is not limited to, a battery device. A battery device (Battery Apparatus) may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar component.

[0088] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0089] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0090] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0091] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0092] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0093] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0094] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0095] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0096] As an example, the battery cell can be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include square shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no special limitation in this application.

[0097] A battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0098] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0099] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector.

[0100] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0101] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active material layers of batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co At least one of 0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2) and modified compounds thereof. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0102] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material layer may not be provided on the surface of the foamed metal, but of course, the positive electrode active material layer may also be provided. As an example, the positive electrode active material layer is filled or / and deposited in the foamed metal.

[0103] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0104] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0105] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0106] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material layer is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0107] As an example, the negative electrode active material layer may adopt a negative electrode active material layer for a battery cell that is well known in the art. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers for battery cells may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0108] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode plate, the surface of the foam metal may not be provided with a negative electrode active material layer, but of course, a negative electrode active material layer may also be provided.

[0109] As an example, a negative electrode active material layer may be filled and / or deposited in the negative electrode current collector.

[0110] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0111] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0112] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0113] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0114] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0115] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0116] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0117] In some embodiments, the electrode assembly is a laminate structure.

[0118] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0119] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0120] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0121] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0122] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0123] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0124] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0125] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells or battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0126] The technical solutions described in the embodiments of the present application are applicable to various energy storage devices using battery cells or battery devices, such as energy storage containers or energy storage cabinets.

[0127] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0128] Figure 1 is a schematic diagram of the structure of a vehicle 1000 according to one or more embodiments.

[0129] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0130] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0131] Figure 2 is a perspective exploded schematic diagram of a battery device 100 according to one or more embodiments.

[0132] like Figure 2 As shown, the battery device 100 includes a box body 10 and at least one battery cell 20. A receiving space is provided in the box body 10, and the at least one battery cell 20 is received in the receiving space.

[0133] In some embodiments of the present application, the box 10 may include a first box 101 and a second box 102. The first box 101 and the second box 102 are buckled together to form a receiving space inside the box 10 to accommodate the battery cell 20. The receiving space here may be sealed or unsealed.

[0134] The second box 102 may be a hollow structure with one end open, the first box 101 may be a plate-like structure, and the first box 101 covers the open side of the second box 102, so that the first box 101 and the second box 102 jointly define a storage space; the first box 101 and the second box 102 may also be hollow structures with one side open, and the open side of the first box 101 covers the open side of the second box 102. Of course, the box 10 formed by the first box 101 and the second box 102 may be in various shapes, such as a cylinder, a cuboid, etc.

[0135] In the battery device 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the second box 102 and the first box 101; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the second box 102 and the first box 101. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0136] Below, refer to Figures 3 to 15 Some embodiments of the present application are described in detail.

[0137] In some embodiments of the present application, for the convenience of description, a first direction X, a second direction Y and a third direction Z are set, and the first direction X, the second direction Y and the third direction Z intersect each other, and the intersection includes a vertical intersection. Figures 3 to 15 As shown by the arrows in , the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction.

[0138] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments; Figure 4 is a schematic diagram of a three-dimensional exploded structure of a battery cell according to one or more embodiments; Figure 5 A partial schematic diagram of a structure of two interlocking battery cells according to one or more embodiments; Figure 6 for Figure 5 The main view of the structure; Figure 7 is a partial structural schematic diagram of a first structure of a battery cell according to one or more embodiments; Figure 8 for Figure 7 The main view of the structure; Fig. 9 is a partial structural schematic diagram of a second structure of a battery cell according to one or more embodiments; Fig.10 for Fig. 9 The main view of the structure; Fig.11 is a partial schematic diagram of another structure of two interlocking battery cells according to one or more embodiments; Fig.12 is a partial structural schematic diagram of a third structure of a battery cell according to one or more embodiments; Fig.13 is a partial structural schematic diagram of a fourth structure of a battery cell according to one or more embodiments; Fig.14 For two Fig.13 A schematic diagram of a structure in which the middle structure is engaged; Fig.15 for Fig.10 A cross-sectional view of the structure shown is formed by cutting along the plane where the first direction and the second direction are located.

[0139] The first aspect of the present application provides a battery cell 20, such as Figures 3 to 6 As shown, the battery cell 20 includes a shell 1 and an electrode assembly 2, the shell 1 has a accommodating cavity; the electrode assembly 2 is accommodated in the accommodating cavity; the shell 1 includes two first walls 11 arranged opposite to each other along a first direction X, at least one first wall 11 includes a main body structure 111 and a snap-fit ​​structure 110 arranged on the side of the main body structure 111 facing away from the accommodating cavity, and the snap-fit ​​structure 110 of the battery cell 20 is used to snap-fit ​​the snap-fit ​​structure 110 of the adjacent battery cell 20.

[0140] The electrode assembly 2 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 2 may be included in the housing 1. The electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet, and a separator, and the separator is disposed between the negative electrode sheet and the positive electrode sheet. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode sheet and the negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting and allow active ions to pass through. The positive electrode sheet includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector and a positive electrode protrusion protruding from the positive current collector, the positive current collector is coated with a positive active material layer, at least part of the positive electrode protrusion is not coated with the positive active material layer, and the positive electrode protrusion serves as a positive electrode tab 21. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer arranged on at least one surface of the negative electrode collector, and the negative electrode active material layer is coated on the surface of the negative electrode collector; the negative electrode collector includes a negative electrode collecting part and a negative electrode protrusion protruding from the negative electrode collecting part, the negative electrode collecting part is coated with the negative electrode active material layer, at least part of the negative electrode protrusion is not coated with the negative electrode active material layer, and the negative electrode protrusion serves as a negative electrode ear 22.

[0141] Exemplarily, one of the two first walls 11 includes a main body structure 111 and a snap-fit ​​structure 110 disposed on a side of the main body structure 111 facing away from the accommodating cavity. Exemplarily, both first walls 11 include a main body structure 111 and a snap-fit ​​structure 110 disposed on a side of the main body structure 111 facing away from the accommodating cavity.

[0142] The engaging structure 110 is a structure that can be engaged with another engaging structure 110. By engaging the engaging structure 110 with another engaging structure 110, two battery cells 20 can be connected together. In this way, by connecting any two adjacent battery cells, a combination of more than two battery cells 20 is formed. Exemplarily, one of the two engaging engaging structures 110 includes a protruding structure, and the other includes a groove structure. The protruding structure is engaged with the groove structure. The engagement of the two at least includes that the relative movement of the two in the arrangement direction of the battery cells is constrained, so that the two adjacent battery cells 20 cannot move relative to each other in the arrangement direction. The engagement of the two may also include that the relative movement of the two in another direction intersecting with the arrangement direction of the battery cells is also constrained. For example, the groove structure extends along a direction perpendicular to the arrangement direction of the battery cells, and the protruding structure slides into the groove structure along this direction. The relative movement between the protruding structure and the groove structure in other directions except the extension direction of the groove structure is constrained. Of course, the engagement between the two can also be such that the relative movement of the two in any direction is restricted, that is, the protrusion structure and the groove structure are fixedly connected together. For example, the protrusion structure is interference-fitted with the groove structure.

[0143] The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc. In some embodiments, the shell 1 can be a sealed structure or a non-sealed structure. As an example, when the shell 1 is a non-sealed structure, the shell 1 plays a role in protecting the electrode assembly 2, and a sealing bag is also included between the shell 1 and the electrode assembly 2, and the sealing bag is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 1 is a sealed structure, it is used to encapsulate components such as the electrode assembly 2 and the electrolyte. Exemplarily, the shell 1 can be cylindrical or prismatic. Prismatic shapes include square shell shapes, blade shapes, and polygonal prisms. The polygonal prisms are, for example, hexagonal prisms, etc., and there are no special restrictions in this application.

[0144] It can be understood that the shell 1 is composed of a plurality of shell walls, and a receiving cavity is formed between the plurality of shell walls, and the two first walls 11 are any two opposite shell walls among the plurality of shell walls. Exemplarily, the shell 1 is a square shell, and the two first walls 11 are two large faces of the square shell. The large face is the shell wall with the largest outer surface area of ​​the shell 1. Of course, the two first walls 11 can also be any pair of opposite shell walls among the four shell walls of the shell 1 except the two large faces, which is not specifically limited here.

[0145] In the embodiment of the present application, by configuring at least one first wall 11 of a battery cell 20 to have a snap-fit ​​structure 110, the battery cells 20 can be snapped together through their respective snap-fit ​​structures 110, thereby achieving connection between the battery cells 20. This can eliminate the surface cleaning process required when using a gluing process, and can also shorten the offline time when using structural adhesive bonding, thereby improving the production efficiency of grouping multiple battery cells 20, thereby improving the production efficiency of the battery device 100 including multiple battery cells 20.

[0146] In some embodiments of the present application, Figure 3 and Figure 4 As shown, the housing 1 includes an end cap 130 and a shell 120. The shell 120 is provided with an opening, and the end cap 130 covers the opening. The shell 120 may be provided with one or more openings. One or more end caps 130 may also be provided. The two first walls 11 are two opposite shell walls of the shell 120.

[0147] For example, Figure 3 and Figure 4 As shown, the end cover 130 is provided with a pressure relief mechanism 3 and two poles 4 . The two poles 4 are respectively connected to the positive pole tab 21 and the negative pole tab 22 of the electrode assembly 2 through an adapter plate 5 . The pressure relief mechanism 3 is arranged between the two poles 4 .

[0148] In some embodiments of the present application, Figure 5 and Figure 6 As shown, the locking structure 110 includes protrusion structures 112 arranged in sequence along a second direction Y intersecting the first direction X, and a groove structure 113 is formed between the adjacent protrusion structures 112 and the main body structure 111 along the second direction Y. The groove structure 113 and the protrusion structure 112 of the battery cell 20 are used to respectively lock the protrusion structure 112 and the groove structure 113 of the adjacent battery cell 20.

[0149] It is understandable that the shapes and sizes of any mutually engaging protrusions 112 and grooves 113 are compatible, that is, one of two adjacent battery cells 20 has a protrusion 112, and the other has a groove 113 matching the protrusion 112, and the shapes and sizes of the protrusion 112 and the groove 113 are compatible. Figure 6As shown, the protrusion structure 112 is a wedge-shaped protrusion, and the groove structure 113 engaged with the protrusion structure 112 is a wedge-shaped groove, and the sizes of the two are adapted, so that the protrusion structure 112 can enter the groove structure 113, and when the protrusion structure 112 is located in the groove structure 113, the surfaces of the protrusion structure 112 and the surfaces of the groove structure 113 are correspondingly fitted or have a set gap, and the size of the set gap is relatively small, so that the connection reliability between the battery cells 20 meets the requirements after the two are engaged, and the specific value of the set gap is determined according to the requirements, and again no specific limitation is made.

[0150] For example, Figure 6 As shown, the shells 1 of the two battery cells 20 are respectively a first shell 1a and a second shell 1b, the first shell 1a and the second shell 1b are arranged along a first direction X, the protruding structure 112 of the first wall 11 of the first shell 1a close to the second shell 1b is inserted into the groove structure 113 of the first wall 11 of the second shell 1b close to the first shell 1a, and the protruding structure 112 of the first wall 11 of the second shell 1b close to the first shell 1a is inserted into the groove structure 113 of the first wall 11 of the first shell 1a close to the second shell 1b, so that the two battery cells 20 are engaged.

[0151] In this way, two adjacent battery cells 20 are engaged with each other through their respective protrusion structures 112 and groove structures 113, thereby improving the connection reliability between the battery cells 20. The reliable connection can not only reduce the probability of damage to the battery cells 20 due to shaking and extend the service life, but also improve the smoothness of current transmission between the battery cells 20, reduce energy loss and improve energy utilization.

[0152] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the inner wall of the groove structure 113 includes a groove bottom wall 1131 and two groove side walls 1132 respectively connected to the two ends of the groove bottom wall 1131 along the second direction Y. In the second direction Y, the minimum spacing between the two groove side walls 1132 is greater than the spacing between one end of the two groove side walls 1132 connected to the groove bottom wall 1131.

[0153] It can be understood that the position where the two groove side walls 1132 have the smallest spacing in the second direction Y can be located at the middle position of the groove bottom wall 1131 along the first direction X, or can be located at the edge position of one end away from the groove bottom wall 1131 along the first direction X, as long as the position with the smallest spacing is not at the edge of one end where the groove side wall 1132 connects to the groove bottom wall 1131.

[0154] In this way, the space between at least the position where the two groove side walls 1132 are at the smallest distance and the groove bottom wall 1131 can constrain the relative movement of the protruding structure 112 entering the groove structure 113 along the first direction X and the relative movement along the second direction Y, thereby achieving engagement.

[0155] In some embodiments of the present application, Figure 7 and Figure 8 As shown, in the second direction Y, the distance between the two groove side walls 1132 gradually decreases from one end close to the groove bottom wall 1131 to the end away from the groove bottom wall 1131 .

[0156] Exemplarily, the groove sidewall 1132 is an arc-shaped surface.

[0157] Exemplarily, the groove sidewall 1132 is a plane, and the plane is inclined from one end close to the groove bottom wall 1131 to one end away from the groove bottom wall 1131 toward the other opposite groove sidewall 1132. In this way, the groove structure 113 is a wedge-shaped groove, and correspondingly, the protrusion structure 112 engaged with the groove structure 113 is a wedge-shaped protrusion.

[0158] In this way, the distance between the edges of the two groove side walls 1132 at one end away from the groove bottom wall 1131 is minimized, so that the groove structure 113 and the protrusion structure 112 are more securely engaged, thereby improving the reliability of the connection between the battery cells 20. The secure connection can not only reduce the probability of damage to the battery cells 20 due to shaking and extend the service life, but also improve the smoothness of current transmission between the battery cells 20, reduce energy loss, and improve energy utilization.

[0159] In some embodiments of the present application, Figure 7 As shown, the groove structure 113 extends along a third direction Z intersecting both the first direction X and the second direction Y, and a snap-in opening 1133 is formed on at least one of two opposite surfaces of the first wall 11 along the third direction Z.

[0160] In this way, the protruding structure 112 of the battery cell 20 enters the groove structure 113 through the insertion opening 1133 of the groove structure 113 of the adjacent battery cell 20 along the third direction Z, and the two battery cells 20 are engaged after the protruding structure 112 is completely engaged in the groove structure 113. The engagement operation is convenient to operate, which is conducive to improving the grouping efficiency between the battery cells 20.

[0161] In some embodiments of the present application, Figures 7 to 14As shown, the two first walls 11 of the same battery cell 20 both include a main body structure 111 and a protrusion structure 112 and a groove structure 113 arranged on the side of the main body structure 111 facing away from the accommodating cavity, the protrusion structures 112 of the two first walls 11 of the same battery cell 20 are arranged opposite to each other in the first direction X, and the groove structures 113 of the two first walls 11 of the same battery cell 20 are arranged opposite to each other in the first direction X; and / or, the protrusion structure 112 of one of the two first walls 11 of the same battery cell 20 and the groove structure 113 of the other are arranged opposite to each other in the first direction X.

[0162] Thus, by providing the protrusion structure 112 and the groove structure 113 on the two first walls 11 of the battery cell 20, the battery cell 20 can be clamped on both opposite sides of the battery cell 20 along the first direction X, so that more than three battery cells 20 can be grouped to increase the capacity.

[0163] For example, Figures 7 to 12 As shown, the two first walls 11 of the same battery cell 20 both include a body structure 111 and a protrusion structure 112 and a groove structure 113 disposed on the side of the body structure 111 facing away from the accommodating cavity. The protrusion structures 112 of the two first walls 11 of the same battery cell 20 are disposed opposite to each other in the first direction X, and the groove structures 113 of the two first walls 11 of the same battery cell 20 are disposed opposite to each other in the first direction X. In this way, the structures of the engaging structures 110 of the two first walls 11 of the same battery cell 20 are the same. In this structure, the specific structures of the engaging structures 110 of the two engaging battery cells 20 are different, for example, Fig.11 As shown, the two first walls 11 of the first shell 1a of the first battery cell 20 both have four groove structures 113 and three protrusion structures 112, and the two first walls 11 of the second shell 1b of the second battery cell 20 both have four protrusion structures 112 and three groove structures 113. The four groove structures 113 of the first shell 1a are engaged with the four protrusion structures 112 of the second shell 1b in a one-to-one correspondence, and the three protrusion structures 112 of the first shell 1a are engaged with the three groove structures 113 of the second shell 1b in a one-to-one correspondence.

[0164] For example, Fig.13 and Fig.14 As shown, the two first walls 11 of the same battery cell 20 both include a body structure 111 and a protrusion structure 112 and a groove structure 113 disposed on the side of the body structure 111 facing away from the accommodating cavity. The protrusion structure 112 of one of the two first walls 11 of the same battery cell 20 and the groove structure 113 of the other are disposed opposite to each other in the first direction X. In this way, the structures of the engaging structures 110 of the two first walls 11 of the same battery cell 20 are different. In this structure, the structures of the two engaging battery cells 20 can be the same, for example, Fig.14 As shown, the structures of the outer shells 1 of the two battery cells 20 are the same, one of the two first walls 11 of each outer shell 1 has four protrusion structures 112 and three groove structures 113, and the other has four groove structures 113 and three protrusion structures 112. The battery cell 20 is engaged with the first wall 11 of the other battery cell 20 having four groove structures 113 and three protrusion structures 112 through its first wall 11 having four protrusion structures 112 and three groove structures 113.

[0165] In some embodiments of the present application, Figures 7 to 14 As shown, a flow channel 1150 for allowing a heat exchange medium to flow is provided in the protrusion structure 112 and / or the main body structure 111 .

[0166] For example, Figure 8 As shown, a flow channel 1150 is provided in the main body structure 111 .

[0167] For example, Fig.10 As shown, a flow channel 1150 is provided in the protruding structure 112 .

[0168] Exemplarily, flow channels 1150 are respectively provided in the main body structure 111 and the protruding structure 112 . For example, at least one flow channel 1150 is provided in the main body structure 111 , and at least one flow channel 1150 is provided in the protruding structure 112 .

[0169] Exemplarily, a flow channel 1150 is provided in the structure composed of the main body structure 111 and the protruding structure 112 , and a portion of the flow channel 1150 is located in the main body structure 111 , and another portion is located in the protruding structure 112 .

[0170] By arranging the flow channel 1150 in the protruding structure 112 and / or the main body structure 111, the flow channel 1150 is formed on the first wall 11, and there is no need to arrange a heat exchange plate on the outside of the shell 1, which saves space and helps to improve the volume energy density.

[0171] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the flow channel 1150 is disposed in the main body structure 111 , and a dimension H1 of the main body structure 111 along the first direction X is in the range of 4 mm to 6 mm.

[0172] For example, Figure 8As shown, the dimension H1 of the main body structure 111 along the first direction X can be but is not limited to 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, and 6mm.

[0173] In this way, by limiting the size of the main body structure 111 along the first direction X to be in the range of 4 mm to 6 mm, the flow channel 1150 is sufficiently arranged in the main body structure 111 and the thickness of the first wall 11 is not too large.

[0174] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the flow channel 1150 is disposed in the main body structure 111 , and along the second direction Y, the ratio between the maximum dimension L1 of the groove structure 113 and the maximum dimension L2 of the protrusion structure 112 is in the range of 2.5-3.

[0175] For example, Figure 8 As shown, along the second direction Y, the ratio between the maximum dimension L1 of the groove structure 113 and the maximum dimension L2 of the protrusion structure 112 may be, but is not limited to, 2.5, 2.6, 2.7, 2.8, 2.9, or 3.

[0176] In this way, when the flow channel 1150 is provided in the main body structure 111, the protrusion structure 112 may not be provided with the flow channel 1150, and there is no need for a larger size, and it may be provided relatively small. Therefore, by setting the above ratio, the groove structure 113 is provided relatively large, and the protrusion structure 112 is provided relatively small, which is beneficial to reducing the consumables of the protrusion structure 112 and the material cost. Moreover, the above size of the protrusion structure 112 meets the strength requirement of the engaging groove structure 113.

[0177] In some embodiments of the present application, Fig. 9 and Fig.10 As shown, the flow channel 1150 is disposed in the protruding structure 112 , and a dimension H1 of the main body structure 111 along the first direction X is in the range of 1 mm to 1.5 mm.

[0178] For example, Fig.10 As shown, a dimension H1 of the main body structure 111 along the first direction X may be, but is not limited to, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm.

[0179] Since the flow channel 1150 is arranged in the protruding structure 112, the main body structure 111 may not be provided with the flow channel 1150, and the main body structure 111 may be set to be relatively thin. Therefore, the dimension H1 of the main body structure 111 along the first direction X is set to be in the range of 1mm~1.5mm, so that the thickness of the main body structure 111 is relatively thin, which is conducive to reducing the overall thickness of the first wall 11, and this range also meets the strength requirements of the main body structure 111.

[0180] In some embodiments of the present application, Fig. 9 and Fig.10 As shown, the flow channel 1150 is disposed in the protrusion structure 112 , and along the second direction Y, the ratio between the maximum dimension L2 of the protrusion structure 112 and the maximum dimension L1 of the groove structure 113 is in the range of 2.5-3.

[0181] For example, Fig.10 As shown, along the second direction Y, the ratio between the maximum dimension L2 of the protrusion structure 112 and the maximum dimension L1 of the groove structure 113 may be, but is not limited to, 2.5, 2.6, 2.7, 2.8, 2.9, or 3.

[0182] Since the flow channel 1150 is arranged in the protrusion structure 112, the protrusion structure 112 needs to have a sufficiently large size to set the flow channel 1150. Therefore, the ratio between the maximum dimension L2 of the protrusion structure 112 along the second direction Y and the maximum dimension L1 of the groove structure 113 is set in the range of 2.5~3, which not only meets the size requirement of the protrusion structure 112 for setting the flow channel 1150, but also does not make the groove structure 113 too narrow to affect the clamping strength.

[0183] In some embodiments of the present application, Fig.11 As shown, the protruding structures 112 of the two first walls 11 of the same battery cell 20 are arranged opposite to each other in the first direction X, and the groove structures 113 of the two first walls 11 of the same battery cell 20 are arranged opposite to each other in the first direction X; and / or, the protruding structure 112 of one of the two first walls 11 of the same battery cell 20 and the groove structure 113 of the other are arranged opposite to each other in the first direction X. The protruding structures 112 of the two first walls 11 of the same battery cell 20 are both provided with flow channels 1150, and the dimension H1 of the body structure 111 along the first direction X is in the range of 1 mm to 1.5 mm.

[0184] By arranging the flow channels 1150 in the protruding structure 112 and setting the dimension H1 of the main structure 111 along the first direction X to be relatively small, it is beneficial to reduce the dimension of the housing 1 along the first direction X and reduce the space occupied by the battery cell 20, thereby improving the energy density of the battery device 100 including multiple battery cells 20.

[0185] In some embodiments of the present application, Figure 8 and Fig.10 As shown, a dimension H2 of the protruding structure 112 along the first direction X is in the range of 2.5 mm to 5 mm.

[0186] For example, Figure 8 As shown, the flow channel 1150 is disposed in the main body structure 111 , and the flow channel 1150 is not disposed in the protruding structure 112 . The dimension H2 of the protruding structure 112 along the first direction X is in the range of 2.5 mm to 5 mm.

[0187] For example, Fig.10 As shown, the flow channel 1150 is disposed in the protruding structure 112 , and a dimension H2 of the protruding structure 112 along the first direction X is in the range of 2.5 mm to 5 mm.

[0188] For example, Figure 8 and Fig.10 As shown, the dimension H2 of the protruding structure 112 along the first direction X can be but is not limited to 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, and 5mm.

[0189] By limiting the dimension H2 of the protrusion structure 112 along the first direction X to the range of 2.5 mm to 5 mm, the strength requirements of the protrusion structure 112 and the reliability requirements of the engagement between the protrusion structure 112 and the groove structure 113 can be met, and the overall thickness of the first wall 11 will not be too large due to the dimension H2 of the protrusion structure 112 being too large.

[0190] In some embodiments of the present application, Figure 8 and Fig.10 As shown, the protruding structure 112 is a shell-like structure with an inner cavity, in which a tube body 115 with a flow channel 1150 is disposed; and / or, the main body structure 111 is a shell-like structure with an inner cavity, in which a tube body 115 with a flow channel 1150 is disposed.

[0191] It should be noted that the tube body 115 can be a round tube or a square tube, and the square tube can be a square tube or a rectangular tube. Exemplarily, the tube body 115 is a rectangular tube, and the length direction of the cross section of the rectangular tube is consistent with the second direction Y, which is conducive to increasing the heat exchange area between the tube body 115 and the electrode assembly 2 and improving the heat exchange effect.

[0192] The protruding structure 112 and / or the main body structure 111 are configured as shell-like structures, which reduces the weight of the first wall 11, thereby reducing the weight of the battery cell 20, and also enables the first wall 11 to have a buffering and energy absorption function, reducing the probability of the first wall 11 being damaged by impact, thereby facilitating the improvement of the service life of the battery cell 20. A tube body 115 having a flow channel 1150 is provided in the inner cavity of the protruding structure 112 and / or the main body structure 111, so that the flow channel 1150 is provided in the protruding structure 112 and / or the main body structure 111, thereby achieving thermal management of the battery cell 20.

[0193] For example, Figures 5 to 8 As shown, the main body structure 111 and the protruding structure 112 are both shell-like structures with inner cavities. A tube body 115 with a flow channel 1150 is disposed in the inner cavity of the main body structure 111 .

[0194] For example, Figures 9 to 14 As shown, the main body structure 111 is a flat plate structure, the protruding structure 112 is a shell-like structure with an inner cavity, and a tube body 115 with a flow channel 1150 is provided in the inner cavity of the main body structure 111 .

[0195] In some embodiments of the present application, Figures 8 to 14 As shown, the tube body 115 is welded to the shell wall of the shell-like structure; and / or, the tube body 115 is plugged into the shell wall of the shell-like structure.

[0196] For example, the joint between the tube body 115 and the shell wall of the shell-like structure may be welded by laser welding or friction stir welding to ensure that there is no leakage at the joint surface.

[0197] In this way, the connection between the tube body 115 and the main body structure 111 and / or the protruding structure 112 is achieved, so that the flow channel 1150 is provided in the main body structure 111 and / or the protruding structure 112. In addition, the above connection method has simple connection operation and high connection strength.

[0198] In some embodiments of the present application, Figures 8 to 14 As shown, the tube body 115 extends along a third direction Z that intersects both the first direction X and the second direction Y, one end of the tube body 115 is connected to the shell wall of the protruding structure 112 and / or the main structure 111 at one end along the third direction Z, and the other end of the tube body 115 is connected to the shell wall of the protruding structure 112 and / or the main structure 111 at the other end along the third direction Z.

[0199] In this way, the connection between the tube body 115 and the protruding structure 112 and / or the main body structure 111 is achieved. Moreover, since the outer walls of the protruding structure 112 at both ends along the second direction Y are the groove side walls of the groove structure 113, the protruding structure 112 needs to be accommodated in the groove structure 113, and it is not easy to set up a pipeline for injecting or discharging the heat exchange medium here. For this reason, the tube body 115 is set to extend along a third direction Z that intersects both the first direction X and the second direction Y, so as to facilitate the installation arrangement of the pipeline for injecting or discharging the heat exchange medium.

[0200] For example, Figures 5 to 8 As shown, the main body structure 111 and the protruding structure 112 are both shell-like structures with an inner cavity, and the shell walls of the main body structure 111 at both ends along the third direction Z are formed with connecting openings. A tube body 115 is provided in the inner cavity of the main body structure 111, and the two ends of the tube body 115 are respectively welded to the shell walls of the main body structure 111 at both ends along the third direction Z, and the openings at both ends of the tube body 115 are respectively connected to the two connecting openings.

[0201] For example, Figures 5 to 8 As shown, the main body structure 111 and the protruding structure 112 are both shell-like structures with inner cavities. The shell walls of the main body structure 111 at both ends along the third direction Z are formed with connecting openings. A tube body 115 is provided in the inner cavity of the main body structure 111, and both ends of the tube body 115 are respectively inserted into the two connecting openings.

[0202] For example, Figures 9 to 14 As shown, the main body structure 111 is a flat plate structure, and the protruding structures 112 are shell-like structures with an inner cavity. The shell walls of the protruding structures 112 at both ends along the third direction Z are formed with connecting openings. A tube body 115 is provided in the inner cavity of the protruding structure 112, and the two ends of the tube body 115 are respectively welded to the shell walls of the protruding structure 112 at both ends along the third direction Z, and the openings at both ends of the tube body 115 are respectively connected to the two connecting openings.

[0203] For example, Figures 9 to 14 As shown, the main body structure 111 is a flat structure, the protruding structure 112 is a shell-like structure with an inner cavity, the shell walls of the protruding structure 112 at both ends along the third direction Z are formed with connecting openings, and a tube body 115 is provided in the inner cavity of the protruding structure 112, and the two ends of the tube body 115 are respectively inserted into the two connecting openings.

[0204] In some embodiments of the present application, the protruding structure 112 and / or the main body structure 111 provided with the tube body 115 are respectively provided with an inlet and an outlet at both ends along the third direction Z, and the inlet and the outlet are both connected to the flow channel 1150 of the tube body 115. The inlet is used to inject heat exchange medium into the tube body 115, and the outlet is used to discharge the heat exchange medium in the tube body 115.

[0205] It should be noted that the inlet and outlet can be openings formed on the shell wall of the protruding structure 112 and / or the main structure 111, or can be openings at both ends of the tube 115 that pass through the shell wall of the protruding structure 112 and / or the main structure 111 and extend out of the outer shell 1.

[0206] In some embodiments of the present application, Fig.15 As shown, the inner cavity of the protruding structure 112 and / or the main body structure 111 is provided with reinforcing ribs 114 .

[0207] By providing the reinforcing ribs 114, the structural strength of the protruding structure 112 and / or the main body structure 111 is improved, which is beneficial to maintaining the shape of the first wall 11, thereby maintaining the engaging state between the battery cells 20. In this way, not only the probability of damage to the battery cells 20 due to shaking can be reduced, and the service life can be extended, but also the smoothness of current transmission between the battery cells 20 can be improved, energy loss can be reduced, and energy utilization can be improved.

[0208] In some embodiments of the present application, Figure 7 and Fig. 9 As shown, along the third direction Z, the end surfaces of both ends of the protruding structure 112 are flush with the end surfaces of both ends of the main body structure 111 respectively.

[0209] In this way, the structure of the first wall 11 is neat, which is conducive to saving space, and is conducive to improving the reliability of the engagement between the battery cells 20, and the strength is uniform in the third direction Z, which can improve the structural strength of the housing 1. In addition, in the case where the flow channel 1150 is arranged on the protruding structure 112, it is arranged in this way so that the inlet and outlet of the flow channel 1150 are respectively located at the end surfaces of the first wall 11 along the third direction Z, which is conducive to extending the length of the flow channel 1150 and improving the heat exchange effect.

[0210] In some embodiments of the present application, Figure 3 and Figure 4 As shown, the housing 1 also includes a second wall 12 opposite to each other along the second direction Y and two third walls 13 opposite to each other along the third direction Z. Both ends of the second wall 12 are respectively connected to the two first walls 11. Two openings opposite to each other along the third direction Z are formed between the two first walls 11 and the two second walls 12. The two third walls 13 cover the two openings respectively. The size of the housing 1 along the third direction Z is greater than the size along the second direction Y, and the size along the second direction Y is greater than the size in the first direction X.

[0211] Exemplarily, the end cover 130 is a shell 120 formed by connecting one third wall 13 , another third wall 13 , two second walls 12 , and two first walls 11 .

[0212] Exemplarily, the end cover 130 is a shell 120 formed by connecting one second wall 12 , another second wall 12 , two third walls 13 , and two first walls 11 .

[0213] In this way, the first wall 11 is the surface with the largest area of ​​the outer shell 1, that is, the first wall 11 is a large surface, and the size of the first wall 11 along the third direction Z is greater than the size along the second direction Y. The protrusion structure 112 and the groove structure 113 both extend along the third direction Z, so that the size of the protrusion structure 112 and the groove structure 113 are longer, which is beneficial to improve the clamping reliability between adjacent battery cells 20, and make the length of the flow channel 1150 longer, thereby improving the heat exchange effect.

[0214] In some embodiments of the present application, Fig.13 As shown, the outer surface of the protrusion structure 112 and / or the inner wall of the groove of the groove structure 113 is provided with a lubricating layer 116 .

[0215] By providing a lubricating layer 116 on the outer surface of the protruding structure 112 and / or the inner wall of the groove of the groove structure 113, the smoothness of the protruding structure 112 sliding into the groove structure 113 is improved, and the smoothness of grouping between the battery cells 20 is improved, which is conducive to improving the assembly efficiency.

[0216] Exemplarily, the lubricating layer includes a fluoroplastic coating or a polyamide resin coating.

[0217] In some embodiments of the present application, Fig.13 As shown, the thickness of the lubricating layer 116 is in the range of 20 μm to 100 μm.

[0218] For example, the thickness of the lubricating layer 116 may be, but is not limited to, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0219] Such a thickness can satisfy the lubrication requirement without taking up too much space due to the lubrication layer 116 being too thick.

[0220] In some embodiments of the present application, the main body structure 111 and the engaging structure 110 are formed as an integrally formed structure.

[0221] Exemplarily, the main body structure 111 and the protruding structure 112 are directly integrally formed by extruding a customized die or precision stamping of an aluminum profile, with a die tolerance of ±0.05mm and a fitting clearance of ≤0.1mm. The formed main body structure 111 or protruding structure 112 is formed into a connecting opening by laser cutting, and the tube body 115 is inserted into the main body structure 111 or the protruding structure 112 through the connecting opening, and the two ends of the tube body 115 are welded to the connecting opening of the shell wall of the main body structure 111 or the protruding structure 112, and the welding method adopts laser welding or stir friction welding to ensure that there is no leakage at the flow channel joint surface.

[0222] In this way, through integral molding, the overall strength of the first wall 11 is improved, and the manufacturing efficiency is also improved.

[0223] In some embodiments of the present application, Figures 5 to 15 As shown, the surface of the main body structure 111 facing the accommodating cavity is a plane.

[0224] Exemplarily, the surface of the main body structure 111 facing the accommodating cavity is a plane, and the plane is perpendicular to the first direction X.

[0225] In this way, the inner surface of the first wall 11 is flat, which is beneficial to increasing the contact area between the first wall 11 and the electrode assembly 2 in the accommodating cavity, reducing the pressure between the first wall 11 and the electrode assembly 2 during interaction, thereby reducing the probability of damage to the electrode assembly 2.

[0226] A second aspect of the present application provides a battery device 100 , comprising a plurality of battery cells 20 provided in the first aspect.

[0227] Since the battery cells 20 provided in the first aspect have high grouping efficiency, the manufacturing efficiency of the battery device 100 including the battery cells 20 is high.

[0228] In some embodiments of the present application, the plurality of battery cells 20 of the battery device 100 are sequentially engaged along the first direction X. At least two adjacent battery cells 20 in the plurality of battery cells 20 have different structures, such as Figure 5 As shown, the structures of the snap-fit ​​structures 110 of the two first walls 11 of the first battery cell 20 are the same, that is, the protrusion structures 112 of the two first walls 11 are arranged opposite to each other in the first direction X, and the groove structures 113 of the two first walls 11 are arranged opposite to each other in the first direction X. The structures of the snap-fit ​​structures 110 of the two first walls 11 of the second battery cell 20 are the same, that is, the protrusion structures 112 of the two first walls 11 are arranged opposite to each other in the first direction X, and the groove structures 113 of the two first walls 11 are arranged opposite to each other in the first direction X. The snap-fit ​​structures 110 of the first walls 11 of the first battery cell 20 and the snap-fit ​​structures 110 of the first walls 11 of the second battery cell 20 can snap-fit ​​to each other. It can be seen that Figure 5 The structures of the two battery cells 20 are different, so the battery device 100 has at least two types of battery cells 20.

[0229] In some embodiments of the present application, the plurality of battery cells 20 of the battery device 100 are sequentially engaged along the first direction X. At least two adjacent battery cells 20 in the plurality of battery cells 20 have the same structure, such as Fig.14 As shown, the structures of the engaging structures 110 of the two first walls 11 of each battery cell 20 are different, and the groove structure 113 of one of the two first walls 11 and the protrusion structure 112 of the other are arranged opposite to each other along the first direction X and have matching sizes and shapes, so that the two battery cells 20 can be engaged together through their respective engaging structures 110 with different structures. It can be seen that Fig.14 The two battery cells 20 in the embodiment have the same structure, so the battery device 100 may have only one battery cell 20 with one structure.

[0230] In some embodiments of the present application, Figure 5 and Figure 6 As shown, the flow channel 1150 of one of the two adjacent battery cells 20 is arranged on the main body structure 111 of the first wall 11, and the flow channel 1150 of the other is arranged on the protruding structure 112 of the first wall 11. In this way, after the two battery cells 20 are combined, two layers of flow channels 1150 are arranged between the accommodating cavities of the two battery cells 20, which is beneficial to improve the thermal management effect.

[0231] In some embodiments of the present application, Fig.11 As shown, the flow channels 1150 of two adjacent battery cells 20 are both arranged in their respective protruding structures 112. At this time, the thickness of the main body structure 111 of the two battery cells 20 is relatively small, which is beneficial to improving the volume energy density of the battery device 100. Moreover, such a setting is beneficial to reducing the distance between each flow channel 1150 and the two accommodating cavities, thereby improving the thermal management effect.

[0232] A third aspect of the present application provides an energy storage device, which includes a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, and the battery cells 20 or the battery devices 100 are used to store or provide electrical energy.

[0233] Since the battery cells 20 provided in the first aspect have high grouping efficiency, the battery device 100 provided in the second aspect has high manufacturing efficiency. Therefore, the energy storage device including the battery cells 20 or the battery device 100 has high manufacturing efficiency.

[0234] A fourth aspect of the present application provides an electrical device, which includes a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, and the battery cells 20 or the battery devices 100 are used to store or provide electrical energy.

[0235] Since the battery cells 20 provided in the first aspect have high grouping efficiency, the battery device 100 provided in the second aspect has high manufacturing efficiency. Therefore, the manufacturing efficiency of the electric device including the battery cells 20 or the battery device 100 is high.

[0236] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0237] As a specific example, a battery cell (battery cell 20) is provided, and two large surfaces (first wall 11) of the shell (shell 1) of the battery cell are provided with concave-convex structures (convex structure 112 and groove structure 113), and the concave-convex structures are designed in a dovetail (wedge shape) so that they can meet the sliding interlocking and matching between adjacent battery cells. The outer surface of the protruding structure 112 and the inner groove wall of the groove structure 113 are sprayed with a 20μm~100μm wear-resistant lubricating coating, and the coating type can be a fluoroplastic coating or a polyamide coating to meet the needs of assembly. A hollow flow channel (flow channel 1150) is designed for the protruding structure (protruding structure 112) to meet the water cooling requirements of the large surface, and the water inlet / water outlet is opened to realize two-way water cooling circulation of the large surface of the battery cell. The water cooling pipe (tube body 115) can be connected to the battery cell shell by welding or plugging.

[0238] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity; An electrode assembly, accommodated in the accommodation cavity; The housing comprises two first walls arranged opposite to each other along a first direction, at least one of the first walls comprises a main body structure and a clamping structure arranged on a side of the main body structure facing away from the accommodating cavity, and the clamping structure of the battery cell is used to clamp the clamping structure of the adjacent battery cell; The locking structure includes protrusion structures arranged in sequence and at intervals along a second direction intersecting the first direction, and a groove structure is formed between the protrusion structures and the main body structure adjacent to each other along the second direction, and the groove structure and the protrusion structure of the battery cell are used to respectively lock the protrusion structure and the groove structure of the adjacent battery cell.

2. The battery cell according to claim 1, characterized in that: The inner wall of the groove structure includes a groove bottom wall and two groove side walls respectively connected to two ends of the groove bottom wall along the second direction. In the second direction, the minimum distance between the two groove side walls is greater than the distance between one ends of the two groove side walls connected to the groove bottom wall.

3. The battery cell according to claim 2, characterized in that: In the second direction, the distance between the two groove side walls gradually decreases from an end close to the groove bottom wall to an end far from the groove bottom wall.

4. The battery cell according to claim 2, characterized in that: The groove structure extends along a third direction intersecting both the first direction and the second direction, and the groove structure is formed with a snap-in opening on at least one of two surfaces of the first wall that are opposite to each other along the third direction.

5. The battery cell according to claim 1, characterized in that: The two first walls of the same battery cell both include the main body structure and the protrusion structure and the groove structure provided on a side of the main body structure facing away from the accommodating cavity. The protrusion structures of the two first walls of the same battery cell are arranged opposite to each other in the first direction, and the groove structures of the two first walls of the same battery cell are arranged opposite to each other in the first direction; or The protrusion structure of one of the two first walls of the same battery cell is arranged opposite to the groove structure of the other wall in the first direction.

6. The battery cell according to claim 1, characterized in that: A flow channel for the heat exchange medium to flow is provided in the protrusion structure and / or the main body structure.

7. The battery cell according to claim 6, characterized in that: The flow channel is arranged in the main body structure, and the dimension of the main body structure along the first direction is in the range of 4 mm to 6 mm.

8. The battery cell according to claim 7, characterized in that: Along the second direction, a ratio between a maximum dimension of the groove structure and a maximum dimension of the protrusion structure is in a range of 2.5 to 3.

9. The battery cell according to claim 6, characterized in that: The flow channel is arranged in the protruding structure, and the dimension of the main body structure along the first direction is in the range of 1 mm to 1.5 mm.

10. The battery cell according to claim 9, characterized in that: Along the second direction, a ratio between a maximum dimension of the protrusion structure and a maximum dimension of the groove structure is in a range of 2.5 to 3.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The dimension of the protruding structure along the first direction is in the range of 2.5 mm to 5 mm.

12. The battery cell according to claim 6, characterized in that: The protruding structure is a shell-like structure having an inner cavity, and a tube body having the flow channel is disposed in the inner cavity of the protruding structure; and / or The main body structure is a shell-like structure with an inner cavity, and a tube body with the flow channel is arranged in the inner cavity of the main body structure.

13. The battery cell according to claim 12, characterized in that: The inner cavity of the protruding structure and / or the main body structure is provided with reinforcing ribs.

14. The battery cell according to claim 12, characterized in that: The tube body is welded to the shell wall of the shell-like structure; and / or The tube body is plugged into the shell wall of the shell-like structure.

15. The battery cell according to claim 12, characterized in that: The tube body extends along a third direction intersecting both the first direction and the second direction, one end of the tube body is connected to the shell wall of the shell-like structure at one end along the third direction, and the other end of the tube body is connected to the shell wall of the shell-like structure at the other end along the third direction.

16. The battery cell according to claim 15, characterized in that: Along the third direction, end surfaces at both ends of the protruding structure are flush with end surfaces at both ends of the main body structure.

17. The battery cell according to claim 4 or 15, characterized in that: The housing further comprises a second wall opposite to each other along the second direction and two third walls opposite to each other along the third direction, the two ends of the second wall are respectively connected to the two first walls, two openings opposite to each other along the third direction are formed between the two first walls and the two second walls, and the two third walls respectively cover the two openings. The size of the housing along the third direction is greater than that along the second direction, and the size of the housing along the second direction is greater than that of the first direction.

18. The battery cell according to any one of claims 1 to 10, characterized in that: The outer surface of the protrusion structure and / or the inner wall of the groove of the groove structure are provided with a lubricating layer.

19. The battery cell according to claim 18, characterized in that: The lubricating layer includes a fluoroplastic coating or a polyamide resin coating.

20. The battery cell according to claim 18, characterized in that The thickness of the lubricating layer is in the range of 20 μm to 100 μm.

21. The battery cell according to any one of claims 1 to 10, characterized in that: The main body structure and the engaging structure are formed as an integrally formed structure.

22. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 21.

23. An energy storage device, characterized in that: The energy storage device comprises a plurality of battery cells according to any one of claims 1 to 21 or a plurality of battery devices according to claim 22, and the battery cells or the battery devices are used to store or provide electrical energy.

24. An electrical device, characterized in that: The electrical device comprises a plurality of battery cells according to any one of claims 1 to 21 or a plurality of battery devices according to claim 22, wherein the battery cells or the battery devices are used to store or provide electrical energy.

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