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

Abstract

The utility model discloses a battery, a battery module, a power utilization device and an energy storage device. The battery comprises a shell, the shell is provided with an inner cavity, the inner side face of the shell is provided with at least one protruding part protruding towards the inner cavity, and the protruding part divides the inner cavity into at least two first containing spaces distributed in the length direction of the shell at intervals; each electrode assembly comprises a main body part and a tab connected with the main body part, the main body part of at least one electrode assembly is accommodated in each first accommodating space, and at least part of the convex part is located between two adjacent main body parts and used for blocking the two adjacent main body parts. The battery has the characteristics of simplified structure, light weight and high utilization rate of the inner cavity of the shell, and the volume energy density of the battery can be further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to batteries, battery modules, electrical devices and energy storage devices. Background Art

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] 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. In these application scenarios, higher requirements are constantly being placed on the lightweight and volume energy density of batteries. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a lightweight, high volume energy density battery, battery module, power device and energy storage device.

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

[0006] The first aspect of the present application provides a battery, which includes: a shell having an inner cavity, the inner side surface of the shell being provided with at least one convex portion protruding toward the inner cavity, the convex portion dividing the inner cavity into at least two first accommodating spaces spaced apart along the length direction of the shell; a plurality of electrode assemblies, each of the electrode assemblies including a main body and a tab connected to the main body, each of the first accommodating spaces accommodating at least the main body of one electrode assembly, and at least a portion of the convex portion being located between two adjacent main bodies for blocking the two adjacent main bodies.

[0007] Since the inner side of the shell is provided with a convex portion for blocking and supporting the main body, the displacement of the electrode assembly in the shell along the length direction of the shell can be limited, thereby reducing the risk of the tab being broken or folded due to being squeezed or pulled. In addition, compared with the additional blocking or supporting components provided between the electrode assemblies, it has the characteristics of simplified structure, light weight, high utilization rate of the shell cavity, and helps to further improve the volume energy density of the battery.

[0008] In some embodiments, the convex portion abuts against two adjacent main body portions respectively.

[0009] The convex portion minimizes the displacement of two adjacent electrode assemblies along the length direction, improves the stability of the electrode assembly in the inner cavity of the shell, can reduce the risk of the tab being squeezed, pulled, broken or undesirably folded, and can also reduce the risk of the electrode assembly being damaged due to friction with the shell due to shaking, which is beneficial to extending the battery life and improving the battery reliability. In addition, by abutting the two adjacent main bodies with the convex portion, the two electrode assemblies can be arranged as compactly as possible while providing a space for accommodating the tabs, which is beneficial to improving the volume utilization of the battery and improving the energy density.

[0010] In some embodiments, insulating members are respectively disposed between the protrusion and two adjacent main body portions.

[0011] By providing an insulating member between the protrusion and the main body, the protrusion and the main body are insulated from each other, thereby reducing the risk of short circuit between the electrode assembly and the shell and improving battery reliability.

[0012] In some embodiments, a second accommodation space is formed between two adjacent first accommodation spaces, and the tabs of two adjacent electrode assemblies are connected and accommodated in the second accommodation space.

[0013] Since the tabs of two adjacent electrode assemblies are accommodated in the second accommodation space, and the two main bodies respectively located in the two adjacent first accommodation spaces are blocked and limited by the convex parts, the risk of the tabs being torn due to the shaking and pulling of the tabs by each electrode assembly along the length direction is reduced, the service life of the battery is extended, and the reliability of the battery is improved. In addition, by providing an accommodation space for the tabs, it helps to reduce the situation where the tabs are undesirably bent, and also helps to reduce the risk of the tabs contacting the main body and causing a short circuit.

[0014] In some embodiments, the outer side surface of the shell is provided with at least one recessed portion recessed inwardly, and the position of each recessed portion corresponds to the position of the convex portion.

[0015] The positions of the recessed portions correspond to the positions of the protruding portions, respectively, so that the recessed portions and the protruding portions form a paired structure. Such a paired structure can be efficiently processed and formed by grooving or stamping, thereby improving the manufacturing efficiency of the battery.

[0016] In some embodiments, the shell includes a plurality of side walls, the plurality of side walls include two opposite first side walls and two opposite second side walls, the protrusions are respectively arranged at the same position along the length direction on the inner side surface of each of the first side walls, and / or the protrusions are respectively arranged at the same position along the length direction on the inner side surface of each of the second side walls.

[0017] Protrusions are respectively arranged on the inner side surfaces of the two opposite side walls of the shell, and the two protrusions face each other, which can support each electrode assembly more stably, improve the support stability, further reduce the risk of each electrode assembly shaking and pulling the pole ear along the length direction, causing the pole ear to tear, thereby extending the service life of the battery and improving the reliability of the battery.

[0018] In some embodiments, the protrusions are respectively provided at the same position along the length direction on the inner side surface of each of the first side walls, and the surface area of ​​the first side wall is smaller than the surface area of ​​the second side wall.

[0019] Providing the convex portion on the relatively small surface instead of the large surface can stably support the electrode assembly while occupying as little space as possible inside the shell, thereby providing a more spacious accommodation space for the tab. Moreover, since the relatively small surface has higher strength than the large surface, it is easy to process.

[0020] In some embodiments, the shell has a width direction and a height direction, the width direction is perpendicular to the height direction and both are perpendicular to the length direction, and the size of the shell along the length direction is larger than the size along the width direction and larger than the size along the height direction.

[0021] Thus, the housing can be an elongated housing.

[0022] In some embodiments, the edge of the protrusion has a chamfer.

[0023] Chamfering can disperse the stress during processing and improve the strength of the convex part. In addition, chamfering can reduce the risk of scratching the electrode assembly and improve battery reliability.

[0024] In some embodiments, a surface of the protrusion facing the main body includes a flat surface.

[0025] The plane is matched with the end face of the main body and has a larger contact area, which further improves the stability of the support and is easy to process.

[0026] In some embodiments, along the length direction, the lengths of two adjacent first accommodating spaces are the same or different.

[0027] This design is more flexible, improves assembly flexibility, and is suitable for more types of electrode assemblies.

[0028] In some embodiments, a plurality of the electrode assemblies are connected in parallel or in series.

[0029] In some embodiments, the main body is a wound structure or a laminated structure.

[0030] In some embodiments, the battery further includes: a positive terminal and a negative terminal; the tabs of each of the electrode assemblies include a positive tab and a negative tab, the positive terminal is connected to the positive tab, and the negative terminal is connected to the negative tab.

[0031] In some embodiments, the battery further includes: an end cover disposed on the shell; the positive terminal and the negative terminal are disposed on the end cover.

[0032] Thus, the positive and negative terminals of the battery can be flexibly arranged by setting the positions of the end covers.

[0033] In some embodiments, the end cap is disposed at at least one end of the shell along the length direction.

[0034] Thus, the positive and negative terminals can be arranged on the same side of the shell in the length direction by arranging the end cover on one side of the shell in the length direction, or the positive and negative terminals can be arranged at both ends of the shell in the length direction by arranging the end cover on both sides of the shell in the length direction.

[0035] In some embodiments, one of the positive terminal and the negative terminal is disposed on the end cap, and the other is connected to the housing.

[0036] Therefore, only one electrode terminal may be provided on the end cover, which is beneficial to improving the volume utilization of the battery module (eg, battery pack).

[0037] In some embodiments, there are n electrode assemblies, and along the length direction, all the positive electrode tabs and all the negative electrode tabs of the first electrode assembly are arranged at the end of the main body of the first electrode assembly facing the second electrode assembly, and the positive electrode tabs and negative electrode tabs are arranged at both ends of the main body of all the electrode assemblies except the first electrode assembly, and the positive terminal and the negative terminal are both located at the end of the shell adjacent to the nth electrode assembly along the length direction, and the positive terminal and the negative terminal are respectively connected to the positive electrode tab and the negative electrode tab at one end of the main body of the nth electrode assembly away from the n-1th electrode assembly, wherein n is a natural number greater than 1.

[0038] Thus, a battery having a positive electrode terminal and a negative electrode terminal on one side is formed.

[0039] In some embodiments, along the length direction, the positive electrode tab is provided at the end of the main body of the first electrode assembly away from the second electrode assembly, the negative electrode tab is provided at the end of the main body of the nth electrode assembly away from the n-1th electrode assembly, the positive electrode tab and the negative electrode tab are provided at opposite ends of the main bodies of two adjacent electrode assemblies, the positive terminal and the negative terminal are respectively located at opposite ends of the shell along the length direction, the positive terminal is connected to the positive electrode tab of the first electrode assembly, and the negative terminal is connected to the negative electrode tab of the nth electrode assembly, where n is a natural number greater than 1.

[0040] Thus, a battery having positive and negative terminals on both sides is constructed.

[0041] A second aspect of an embodiment of the present application provides a battery module, comprising: at least one battery as described above.

[0042] A third aspect of an embodiment of the present application provides an electrical device, which includes the battery for providing electrical energy provided by the first aspect or the battery module provided by the second aspect.

[0043] A fourth aspect of an embodiment of the present application provides an energy storage device, comprising the battery provided by the first aspect or the battery module provided by the second aspect, wherein the battery is capable of storing electrical energy and providing electrical energy.

[0044] Utility model effect:

[0045] Through the embodiments of the present application, the battery has the characteristics of simplified structure, lightweight, and high utilization rate of the inner cavity of the shell, and it helps to further improve the volume energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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:

[0047] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0048] Figure 2 A schematic diagram of a partially cutaway structure of a battery module provided in some embodiments of the present application;

[0049] Figure 3 An exploded schematic diagram of a battery provided for some embodiments of the present application;

[0050] Figure 4 A schematic cross-sectional view of a battery provided for some embodiments of the present application;

[0051] Figure 5 for Figure 4 A partial enlarged schematic diagram of the convex part, the tab and the surrounding structure of the battery shown;

[0052] Figure 6 A schematic diagram of a housing provided for some embodiments of the present application;

[0053] Figure 7 Schematic diagram of a housing provided for other embodiments of the present application;

[0054] Figure 8 An exploded schematic diagram of a battery provided for other embodiments of the present application;

[0055] Fig. 9 A flowchart of a battery manufacturing method provided for some embodiments of the present application.

[0056] Description of reference numerals:

[0057] 1000 vehicle; 100 battery module; 200 controller; 300 motor; 1 battery; 2 box; 3 bottom plate; 4 cover; 10 shell; 11 convex portion; 11a plane; 11b chamfer; 101 first side wall; 102 second side wall; 10a first storage space; 10b second storage space; 20 electrode assembly; 21 main body; 22 tab; 211 positive tab; 212 negative tab; 30 end cap; 41 positive terminal; 42 negative terminal; X length direction; Y width direction; Z height direction. DETAILED DESCRIPTION

[0058] 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.

[0059] 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 and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In the embodiment of the present application, the battery may be a secondary battery, which refers to a battery that can be continuously used by activating the active material by charging after the battery is discharged.

[0067] The battery 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.

[0068] Batteries generally include an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the battery charging and discharging process, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is set 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.

[0069] 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 disposed on at least one surface of the positive electrode current collector.

[0070] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material base 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.).

[0072] As an example, the positive electrode active material 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 materials for batteries may also be used. These positive electrode active materials 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.

[0073] 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 may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or carbon foam, etc. 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.). 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.

[0076] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0077] 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.

[0078] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0079] 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.

[0080] In some embodiments, the battery further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0081] 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.

[0082] In some embodiments, the electrode assembly is a laminate structure.

[0083] 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.

[0084] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0085] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0086] 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.

[0087] 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.

[0088] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0089] 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.

[0090] In some embodiments, the battery may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0091] As an example, the battery may be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include blade-shaped batteries and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no particular limitation in the present application.

[0092] In some embodiments, the housing is provided with an opening, and an end cap is provided at the opening, and the end cap closes the opening to form a closed space for accommodating the electrode assembly and electrolyte and other substances. The housing may be provided with one or more openings. One or more end caps may also be provided.

[0093] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab, or indirectly connected to the tab via a transition component. The electrode terminal may be disposed on the end cap, or on the housing.

[0094] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery.

[0095] In some embodiments, the battery module of the present application embodiment includes one or more batteries to provide a single physical module with higher voltage and capacity. When there are multiple batteries, the multiple batteries are connected in series, in parallel or in mixed connection through a busbar. Multiple batteries are arranged and fixed to form a battery module.

[0096] In some embodiments, the battery module may further include a case in which the battery is accommodated.

[0097] 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.

[0098] Below, this application is described in detail.

[0099] At present, 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.

[0100] In these application scenarios, batteries can have a variety of shapes as needed. For example, for longer batteries, due to the limitations of the electrode assembly manufacturing process, multiple electrode assemblies are usually arranged in sequence along the length of the shell to form a long battery, and connecting components are set between each two adjacent electrode assemblies to support and position each electrode assembly and reduce the risk of tab breakage caused by mutual compression between the electrode assemblies. However, the connecting components increase the weight of the battery, which has an adverse effect on the lightweight of the battery. At the same time, they occupy too much space inside the shell, which is not conducive to improving the volume energy density of the battery.

[0101] In this regard, the present application forms a convex portion inside the shell, and uses the convex portion to block and support the positioning of each electrode assembly, so that the electrode assembly can be positioned even without additional components to support the electrode assembly, which can reduce the number of components and the weight of the battery without taking up too much space inside the shell.

[0102] Based on such a design concept, the present application provides a battery, comprising: a shell having an inner cavity, the inner side surface of the shell being provided with at least one convex portion protruding toward the inner cavity, the convex portion dividing the inner cavity into at least two first accommodating spaces spaced apart along the length direction of the shell; a plurality of electrode assemblies, each electrode assembly comprising a main body and a pole ear connected to the main body, each first accommodating space accommodating at least the main body of one electrode assembly, at least a portion of the convex portion being located between two adjacent main bodies, for blocking the two adjacent main bodies.

[0103] Since the inner side of the shell is provided with a convex portion for blocking and supporting the main body, the displacement of the electrode assembly in the shell along the length direction of the shell can be limited, thereby reducing the risk of the tab being broken or folded due to being squeezed or pulled. In addition, compared with setting a blocking or supporting component between each electrode assembly, it has the characteristics of simplified structure, light weight, high utilization rate of the shell cavity, and helps to further improve the volume energy density of the battery.

[0104] The embodiment of the present application provides an electric device including the above-mentioned battery or battery module for providing electric energy, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0105] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0106] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. 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 module 100 is disposed inside the vehicle 1000, and the battery module 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery module 100 can be used to power the vehicle 1000, for example, the battery module 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 module 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0107] In some embodiments of the present application, the battery module 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0108] Figure 2 This is a three-dimensional exploded schematic diagram of a battery pack provided in an embodiment of the present application. Figure 2 and Figure 3As shown, the battery module 100 includes a box body 2 and at least one battery 1. The box body 2 may include a bottom plate 3 and a cover body 4. The bottom plate 2 is located below the box body 2, and the cover body 4 covers the top of the box body 2, thereby forming a storage space for the battery 1 between the box body 2 and the cover body 4.

[0109] In the battery module 100, there can be multiple batteries 1, and the multiple batteries 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple batteries 1 are both connected in series and in parallel. The multiple batteries 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple batteries 1 is placed in the accommodation space formed by the box body 2 and the cover body 4; of course, the battery module 100 can also be a plurality of batteries 1 connected in series, in parallel, or in mixed connection to form a module unit, and the multiple module units are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in the accommodation space formed by the box body 2 and the cover body 4. The battery module 100 may also include other structures, for example, the battery module 100 may also include a converging component for realizing electrical connection between the multiple batteries 1.

[0110] Below, refer to Figures 3 to 8 Some embodiments of the present application are described in detail.

[0111] The battery 1 of the embodiment of the present application includes a shell 10 and a plurality of electrode assemblies 20. The shell 10 has an inner cavity, and the inner side surface of the shell 10 is provided with at least one convex portion 11 protruding toward the inner cavity, and the convex portion 11 divides the inner cavity into at least two first accommodating spaces 10a distributed at intervals along the length direction X of the shell 10. Each electrode assembly 20 includes a main body 21 and a tab 22 connected to the main body 21, and each first accommodating space 10a accommodates at least one main body 21 of an electrode assembly 20, and at least a portion of the convex portion 11 is located between two adjacent main bodies 21, and is used to block the two adjacent main bodies 21.

[0112] The shell 10 may be cylindrical, prismatic or in other shapes. The prismatic shell may include a blade-shaped (rectangular) shell, a polygonal shell, and the polygonal shell may be, for example, a hexagonal shell, etc. There is no particular limitation in the present application.

[0113] As an example, see Figure 3 The housing 10 has a length direction X, a width direction Y and a height direction Z, wherein the length direction X of the housing 10 is greater than the width direction Y and greater than the height direction Z. As an example, the width direction Y of the housing 10 is greater than the height direction Z, thereby forming a so-called blade-shaped housing. Optionally, Figure 3The length X dimension of the housing 10 shown may be in the range of 400 mm to 1400 mm, the width Y dimension may be in the range of 60 mm to 140 mm, and the height Z dimension may be in the range of 15-35 mm. Figure 3 In the example shown, the dimension of the shell 10 in the length direction X is the distance between the planes of the two end covers 30 arranged along the length direction X where the pole positions are not set; the dimension in the width direction Y is the distance between the two opposite surfaces of the shell along the width direction Y (the positions where the protrusions 11 are not set); the dimension in the height direction Z is the distance between the two opposite surfaces of the shell along the height direction Z.

[0114] The shell 10 may be made of aluminum, aluminum alloy, stainless steel or other metals, or may be made of plastic (such as polypropylene).

[0115] The housing 10 has an inner cavity for accommodating the electrode assembly 20. The inner side of the housing 10 is provided with at least one protrusion 11 protruding toward the inner cavity, so as to divide the inner cavity into at least two first accommodating spaces 10a ( Figure 6 shown).

[0116] The housing 10 may have a plurality of inner side surfaces, and the plurality of inner side surfaces enclose an inner cavity. A convex portion 11 may be provided on any one or more inner side surfaces. The convex portion 11 may be provided in m groups, and the m groups of convex portions 11 are distributed along the length direction X of the housing 10, so as to divide the inner cavity of the housing 10 into m+1 first accommodation spaces 10a distributed at intervals along the length direction X, where m is a natural number greater than or equal to 1.

[0117] Each group of protrusions 11 may include one annular protrusion 11 ; or each group of protrusions 11 may include two or more protrusions 11 located at the same position along the length direction X.

[0118] As an example, a group of protrusions 11 is provided, including two protrusions 11 located at the same position along the length direction X, so that the inner cavity of the shell 10 is divided into two first accommodating spaces 10a distributed along the length direction X at intervals.

[0119] It can be understood that the protrusions 11 can be respectively provided in 2 groups, 3 groups, 4 groups, 5 groups or more groups, and each group can include one protrusion 11, two protrusions 11, three protrusions 11 or more protrusions 11 at the same position along the length direction X, thereby dividing the inner cavity of the shell 10 into 3 first accommodating spaces 10a, 4 first accommodating spaces 10a, 5 first accommodating spaces 10a, 6 first accommodating spaces 10a or more first accommodating spaces 10a distributed at intervals along the length direction X.

[0120] Each electrode assembly 20 includes a main body 21 and a tab 22 connected to the main body 21. The main body 21 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, separator, and negative electrode sheet of the main body 21 are sequentially stacked into a winding structure or a laminated structure.

[0121] The tabs 22 include a positive tab and a negative tab. The positive tab is connected to the positive electrode sheet, and the negative tab is connected to the negative electrode sheet.

[0122] Each first accommodation space 10a accommodates at least one main body 21 of an electrode assembly 20, which can be understood as one main body 21 or multiple main bodies 21 can be accommodated in each first accommodation space 10a; when multiple main bodies 21 are accommodated in the first accommodation space 10a, the number of the multiple main bodies 21 can be two, three or more, and the multiple main bodies 21 can be stacked and arranged along the layer thickness direction Z of the main body 21. And the multiple main bodies 21 in the first accommodation space 10a can be connected in parallel or in series.

[0123] At least part of the protrusion 11 is located between two adjacent main bodies 21 along the length direction X, and is used to block the two adjacent main bodies 21. It can be understood that the protrusion 11 partially extends between the two adjacent main bodies 21 along the length direction X, or the protrusion 11 completely extends between the two adjacent main bodies 21 along the length direction X. Both methods can effectively block and position the two main bodies 21.

[0124] A protrusion 11 for blocking and supporting the main body 21 is provided on the inner side surface of the shell 10. Compared with providing connecting parts between the electrode assemblies 20, it has the characteristics of simplified structure, lightweight, and high utilization rate of the shell cavity, and helps to further improve the volume energy density of the battery.

[0125] In some embodiments, the protrusion 11 abuts against two adjacent main body portions 21 respectively.

[0126] One surface of the convex portion 11 along the length direction X abuts against the end of one of the two adjacent main body portions 21, and the other surface of the convex portion 11 along the length direction X abuts against the end of the other of the two adjacent main body portions 21. The abutment may be direct contact or indirect contact.

[0127] Therefore, the convex portion 11 minimizes the shaking amount of two adjacent electrode assemblies 20 along the length direction X, improves the stability of the electrode assembly 20 in the inner cavity of the shell 10, reduces the risk of damage to the electrode assembly 20 due to friction between the electrode assembly 20 and the shell due to shaking, extends the battery life, and improves the battery reliability.

[0128] In some embodiments, an insulating member 13 is disposed between the protrusion 11 and two adjacent main body portions 21 .

[0129] The insulating member 13 may be attached to the surface of the convex portion 11 facing the main body 21 or to the surface of the main body 21 facing the convex portion 11. For example, the insulating member 13 may be attached to the surface of the convex portion 11 or the surface of the main body 21 by pasting or electrostatic adsorption. The insulating member 13 may also be an insulating layer coated on the surface of the convex portion 11 or the surface of the main body 21.

[0130] The insulating member 13 may be made of polyethylene terephthalate, polypropylene, polyethylene, polyimide or non-woven fabric.

[0131] By disposing an insulating member 13 between the protrusion 11 and the main body 21 , the protrusion 11 and the main body 21 are insulated from each other, thereby reducing the risk of short circuit between the electrode assembly 20 and the shell 10 and improving battery reliability.

[0132] In some embodiments, the convex portion 11 and the main body 21 can be insulated from each other by an isolating member (such as an isolating film) extending from the surface of the main body 21 facing the convex portion 11, thereby eliminating the need to provide an insulating member 13.

[0133] In some embodiments, a second accommodating space 10 b is formed between two adjacent first accommodating spaces 10 a , and the tabs 22 of two adjacent electrode assemblies 20 are connected and received in the second accommodating space 10 b .

[0134] The area where the convex portion 11 is located in the inner cavity of the housing 10 constitutes a second accommodation space 10b. Figure 6 A convex portion 11 divides the inner cavity of the housing 10 into two first accommodating spaces 10 a distributed along the length direction X and a second accommodating space 10 b located in the two first accommodating spaces 10 a.

[0135] The connection of the tabs 22 of two adjacent electrode assemblies 20 may be connected in series or in parallel. The positive tab and the negative tab of each electrode assembly 20 may be led out from the same end of the main body 21 along the length direction X, or respectively led out from opposite ends of the main body 21 along the length direction X, so that the second accommodation space 10b accommodates the positive tab and / or the negative tab.

[0136] As an example, along the length direction X, the positive electrode tab and the negative electrode tab are led out from opposite ends of two adjacent main body parts 21. The positive electrode tab of one electrode assembly 20 of two adjacent electrode assemblies 20 is connected to the positive electrode tab of the other electrode assembly 20, and the negative electrode tab of one electrode assembly 20 is connected to the negative electrode tab of the other electrode assembly 20, so that multiple electrode assemblies 20 are connected in parallel.

[0137] Since the tabs 22 of two adjacent electrode assemblies 20 are accommodated in the second accommodation space 10b, and the main body 21 located in the two adjacent first accommodation spaces 10a is blocked and limited by the convex portion 11, the risk of the tabs 22 being torn due to shaking and pulling of each electrode assembly 20 along the length direction X is reduced, the service life of the battery is extended, and the reliability of the battery is improved. In addition, by providing an accommodation space for the tabs, it is helpful to reduce the situation where the tabs are undesirably bent, and it is also helpful to reduce the risk of the tabs contacting the main body and causing a short circuit.

[0138] In some embodiments, the outer side surface of the housing 10 is provided with at least one recessed portion 12 recessed toward the inner side surface, and the position of each recessed portion 12 corresponds to the position of the convex portion 11 .

[0139] The concave portion 12 and the convex portion 11 are a paired structure, that is, one convex portion 11 corresponds to one concave portion 12. Such a paired structure can be formed by rolling grooves or punching. A plurality of electrode assemblies 20 can be connected and arranged along the length direction X and then placed into the housing 10, and then the convex portion 11 with a certain depth L1 is formed by rolling grooves or punching at the position corresponding to each adjacent two main body portions 21 of the housing 10.

[0140] like Figure 5 As shown, the depth L1 of the protrusion 11 can be selected in the range of 5% L to La, where L is the width of the shell 10, and La is the distance from the outermost edge of the width direction Y of the pole ear 22 to the inner side of the shell 10 where the protrusion is not formed, so that the protrusion 11 has a certain structural strength to support the electrode assembly 20, while reducing the risk of short circuit between the protrusion 11 and the pole ear 22. The length L2 of the protrusion 11 (the dimension in the length direction X) can be approximately equal to the distance between two adjacent main parts 21.

[0141] The positions of the recessed portions 12 correspond to the positions of the protruding portions 11 , respectively, so that the recessed portions 12 and the protruding portions 11 form a paired structure. Such a paired structure can be efficiently processed and formed by grooving or stamping, thereby improving the manufacturing efficiency of the battery.

[0142] In some embodiments, the shell 10 includes multiple side walls, which include two opposite first side walls 101 and two opposite second side walls 102, and a protrusion 11 is respectively arranged at the same position along the length direction X on the inner side surface of each first side wall 101, and / or a protrusion 11 is respectively arranged at the same position along the length direction on the inner side surface of each second side wall 102.

[0143] The two first side walls 101 may be opposite to each other along the width direction Y, and the two second side walls 102 may be opposite to each other along the height direction Z.

[0144] Protrusions 11 are respectively provided on the inner side surfaces of the two opposite side walls of the shell 10. The two protrusions 11 face each other, which can support each electrode assembly 20 more stably, improve the support stability, further reduce the risk of each electrode assembly 20 shaking along the length direction X and pulling the pole ear 22 to cause the pole ear to tear, thereby extending the service life of the battery and improving the reliability of the battery.

[0145] In some embodiments, a protrusion 11 is disposed at the same position of the inner side surface of each first side wall 101 along the length direction X, and the surface area of ​​the first side wall 101 is smaller than the surface area of ​​the second side wall 102 .

[0146] The surface area of ​​the first side wall 101 is smaller than that of the second side wall 102. It can be understood that, when the dimensions in the length direction X are the same, the first side wall 101 is a narrow surface compared to the second side wall 102, and the second side wall 102 is a large surface compared to the first side wall 101. Compared with the large surface, the convex portion 11 is provided on the relatively narrow surface, which can stably support the electrode assembly 20 while occupying as little space as possible inside the shell, thereby providing a more spacious accommodation space for the tab. Moreover, since the relatively small surface has higher strength than the large surface, it is easy to process.

[0147] In some embodiments, the edge of the protrusion 11 has a chamfer 11 b.

[0148] The chamfer 11b may be a rounded corner or a 45-degree bevel. The chamfer 11b can disperse the stress during processing and improve the strength of the protrusion 11; in addition, the chamfer 11b can reduce the risk of scratching the electrode assembly 20 and improve the reliability of the battery.

[0149] In some embodiments, the surface of the protrusion 11 facing the main body 21 includes a flat surface 11 a.

[0150] The entire surface of the convex portion 11 facing the main body 21 is a plane 11a, or the portion abutting against the main body 21 is a plane 11a. The plane 11a is matched with the end surface of the main body 21, and the contact area is larger, further improving the support stability.

[0151] The convex portion 11 can be in various shapes, including but not limited to square ( Figure 6 ), semicircle, square and semicircle combination ( Figure 7 shown), cone, etc.

[0152] In some embodiments, along the length direction X, the lengths of two adjacent first accommodation spaces 10 a are the same or different.

[0153] like Figure 6As shown, the lengths of two adjacent first accommodating spaces 10a are the same, so as to respectively accommodate electrode assemblies 20 of the same length. The lengths of two adjacent first accommodating spaces 10a are different, so as to respectively accommodate electrode assemblies 20 of different lengths.

[0154] Therefore, such a design is more flexible, improves assembly flexibility, and is adaptable to more types of electrode assemblies 20.

[0155] In some embodiments, the battery 1 further includes: a positive terminal 41 and a negative terminal 42; the tabs 22 of each electrode assembly 20 include a positive tab 211 and a negative tab 212, the positive terminal 41 is connected to the positive tab 211, and the negative terminal 42 is connected to the negative tab 212.

[0156] The positive terminal 41 and the positive electrode tab 211 can be connected directly or through a switching piece. The negative terminal 42 and the negative electrode tab 212 can be connected directly or through a switching piece.

[0157] The positive terminal 41 and the negative terminal 42 are used to connect to the busbar component, and the battery 1 is connected to each other through the busbar component to form a battery module. The battery module includes a battery module and a battery pack.

[0158] The positive terminal 41 and the negative terminal 42 may both be provided on the end cover 30 , or one may be provided on the end cover 30 and the other may be provided on the case 10 .

[0159] In some embodiments, reference Figure 3 The battery 1 further includes an end cover 30 , which is disposed on the housing 10 ; a positive terminal 41 and a negative terminal 42 are disposed on the end cover 30 .

[0160] In some embodiments, the end cap 30 is disposed at at least one end of the housing 10 along the length direction X.

[0161] An end cap 30 may be provided at one open end of the housing 10, and the positive terminal 41 and the negative terminal 42 are both provided at the end cap 30. When grouping, all the end caps 30 may be located on the same side, for example Figure 2 As shown, they are all oriented to one side along the length direction X.

[0162] In addition, end caps 30 may be provided at both ends of the housing 10 along the length direction X, and the positive terminal and the negative terminal 42 may be provided at the two end caps 30. When grouped, terminals with the same polarity may be located on the same side, or the terminals on the same side may be arranged alternately with positive and negative polarities.

[0163] In some embodiments, one of the positive terminal 41 and the negative terminal 42 is disposed on the end cap 30, and the other is connected to the housing 10. For example, the positive terminal 41 is disposed on the end cap 30, and the negative terminal 42 is disposed on the housing 10 and electrically connected to the housing 10, so that the housing 10 is negatively charged.

[0164] In some embodiments, see Figure 3 There are n electrode assemblies 20, where n is a natural number greater than or equal to 2. Along the length direction X, all the positive pole tabs 211 and all the negative pole tabs 212 of the first electrode assembly 20 are arranged at the end of the main body 21 of the first electrode assembly 20 facing the second electrode assembly 20, and both ends of the main body 21 of all electrode assemblies 20 except the first electrode assembly 20 are provided with positive pole tabs 211 and negative pole tabs 212. The positive terminal 41 and the negative terminal 42 are both located at the end of the shell 10 along the length direction X adjacent to the nth electrode assembly, and the positive terminal 41 and the negative terminal 42 are respectively connected to the positive pole tab 211 and the negative pole tab 212 at the end of the main body 21 of the nth electrode assembly 20 away from the n-1th electrode assembly 20.

[0165] Along the length direction X, all the positive pole tabs 211 and all the negative pole tabs 212 of the first electrode assembly 20 are arranged at the end of the main body 21 of the first electrode assembly 20 facing the second electrode assembly 20. It can be understood that the end of the main body 21 of the first electrode assembly 20 away from the second electrode assembly 20 has no pole tabs led out, and the positive pole tabs 211 and the negative pole tabs 212 are led out at the end of the main body 21 of the first electrode assembly 20 facing the second electrode assembly 20.

[0166] Along the length direction X, positive electrode tabs 211 and negative electrode tabs 212 are provided at both ends of the main body 21 of all electrode assemblies 20 except the first electrode assembly 20. It can be understood that positive electrode tabs 211 and negative electrode tabs 212 are led out at both ends of the second, third, third...nth electrode assemblies.

[0167] The positive terminal 41 and the negative terminal 42 are both located at one end of the shell 10 adjacent to the nth electrode assembly along the length direction X. It can be understood that the positive terminal 41 and the negative terminal 42 are located on the same side of the shell 10 along the length direction X, that is, the positive terminal 41 and the negative terminal 42 are located on one side.

[0168] As an example, see Figure 3, end caps 30 may be respectively provided at the two open ends of the shell 10, the end cap 30 located on the side of the first electrode assembly 20 is not provided with a tab, and the end cap 30 located on the side of the nth (for example, the second) electrode assembly 20 is provided with a positive terminal 41 and a negative terminal 42. Of course, the shell 10 may also have an open end located on the side of the nth (for example, the second) electrode assembly 20 and an end cap 30 closed at the open end, while the end of the shell 10 located on the side of the first electrode assembly is a closed end without an end cap 30.

[0169] In some embodiments, see Figure 8 Along the length direction X, a positive electrode tab 211 is provided at one end of the main body 21 of the first electrode assembly 20 away from the second electrode assembly 20, a negative electrode tab 212 is provided at one end of the main body 21 of the nth electrode assembly 20 away from the n-1th electrode assembly 20, and positive electrode tabs 211 and negative electrode tabs 212 are provided at opposite ends of the main bodies 21 of two adjacent electrode assemblies 20. The positive terminal 41 and the negative terminal 42 are respectively located at opposite ends of the shell 10 along the length direction X, the positive terminal 41 is connected to the positive electrode tab 211 of the first electrode assembly 20, and the negative terminal 42 is connected to the negative electrode tab 212 of the nth electrode assembly 20.

[0170] Along the length direction X, the end of the main body 21 of the first electrode assembly 20 away from the second electrode assembly 20 is provided with a positive electrode tab 211 and no negative electrode tab, and the end of the main body 21 of the nth electrode assembly 20 away from the n-1th electrode assembly 20 is provided with a negative electrode tab 212 and no positive electrode tab. The second, third, third, ... n-1th electrode assemblies 20 have positive electrode tabs 211 and negative electrode tabs 212 at both ends.

[0171] Along the length direction X, the positive terminal 41 is located at one end of the shell 10 adjacent to the first electrode assembly 20, and the negative terminal 42 is located at one end of the shell 10 adjacent to the nth electrode assembly 20, that is, the positive terminal 41 and the negative terminal 42 are respectively located on both sides of the shell 10, that is, the positive terminal 41 and the negative terminal 42 are on both sides.

[0172] As an example, see Figure 8 End caps 30 may be provided at the two open ends of the shell 10 , respectively. The end cap 30 located on the first electrode assembly 20 side may be provided with a positive terminal 41 , and the end cap 30 located on the nth (eg, second) electrode assembly 20 side may be provided with a negative terminal 42 .

[0173] Next, specific examples of the present application are described.

[0174] Reference Figures 3 to 7The battery of the embodiment of the present application includes a shell 10 and a plurality of electrode assemblies 20. The shell 10 has a length direction X, a width direction Y and a height direction Z, wherein the length direction of the shell 10 is greater than the width direction Y and greater than the height direction Z, and the width direction Y is greater than the height direction Z, thereby forming a blade-shaped shell 10. The shell 10 includes first side walls 101 opposite to each other along the width direction Y and second side walls 102 opposite to each other along the height direction Z, wherein the surface area of ​​the first side wall 101 is smaller than the surface area of ​​the second side wall 102, so that the first side wall 101 is a narrow surface and the second side wall 102 is a large surface. A plurality of convex portions 11 protruding toward the inner cavity of the shell 10 and concave portions 12 corresponding to the positions of the convex portions 11 can be formed on each first side wall 101 by rolling grooves or stamping, so as to divide the inner cavity of the shell 10 into a first accommodation space 10a distributed along the length direction X and a second accommodation space 10b located between two adjacent first accommodation spaces 10a. The first accommodation space 10a is used to accommodate the main body 21 of the electrode assembly 20, and the second accommodation space 10b is used to accommodate the tabs 22 of the electrode assembly 20. Each convex portion 11 blocks two adjacent electrode assemblies 20, thereby reducing the risk of tearing the tabs connected between the two electrode assemblies 20 due to the movement of the electrode assembly 20 along the length direction X, eliminating the traditional connecting components, and the battery has the characteristics of simplified structure, light weight and high volume energy density.

[0175] The depth L1 of the protrusion 11 can be selected in the range of 5% L to La, where L is the width of the shell 10 and La is the distance from the edge of the tab 22 to the inner side of the shell 10, so that the protrusion 11 has a certain structural strength to support the electrode assembly 20 and prevent the protrusion 11 from contacting the tab 22 to cause a short circuit. The length L2 of the protrusion 11 can be approximately equal to the distance between two adjacent main bodies 21.

[0176] The convex portion 11 can be in various shapes, including but not limited to square ( Figure 6 ), semicircle, square and semicircle combination ( Figure 7 shown), cone, etc.

[0177] The embodiment of the present application further provides a battery module 100, comprising: at least one battery 1 mentioned above.

[0178] The battery module 100 may include a plurality of batteries 1 , and the plurality of batteries may be connected via a busbar to form a battery module. The plurality of batteries 1 may be connected in series, in parallel, or in a mixed connection.

[0179] The battery module includes a box body, and the battery 1 is accommodated in the box body.

[0180] In some embodiments, Figure 2 As shown, a plurality of batteries 1 may be arranged on the bottom plate 3 of the box body with their large surfaces facing each other.

[0181] The battery module may be a battery module including a plurality of batteries 1, or a battery pack including a plurality of batteries 1. In some embodiments, the battery pack further includes a heat exchange device such as a water cooling plate, a battery management module, and the like.

[0182] An embodiment of the present application further provides an electrical device, which includes the battery 1 or battery module mentioned above for providing electrical energy.

[0183] An embodiment of the present application also provides an energy storage device, including the battery mentioned above, which can store electrical energy and provide electrical energy.

[0184] The present application also provides a battery manufacturing method, including an electrode assembly shell inserting step and a shell processing step. Fig. 9 As shown, S01 electrode assembly shell placement step, a plurality of electrode assemblies sequentially arranged and connected along the length direction of the shell are placed into the inner cavity of the shell;

[0185] Each electrode assembly includes a main body and a tab connected to the main body. Multiple electrode assemblies can be connected in parallel, in series, or in mixed connection.

[0186] S02 is a shell processing step, in which the shell that accommodates multiple electrode assemblies is processed so that a convex portion protruding toward the inner cavity is formed at a position corresponding to the position between each two adjacent main body parts of the shell, and the convex portion divides the inner cavity into a first accommodating space that respectively accommodates the main body parts, and the convex portion is blocked between two adjacent main body parts along the length direction.

[0187] Through this method, the traditional connecting components between two adjacent electrode assemblies are eliminated, and the two adjacent electrode assemblies are supported by the protrusions, so that the battery structure is simplified and lightweight, and it is beneficial to increase the volume energy density of the battery.

[0188] In some embodiments, S02 shell processing step includes:

[0189] A convex portion protruding toward the inner cavity is formed at a position of the shell corresponding to between each two adjacent main body portions by rolling grooves or stamping.

[0190] In some embodiments, before the step of inserting the electrode assembly into the shell, the method further comprises:

[0191] The electrode assembly pairing step is to arrange the plurality of electrode assemblies along the length direction of the shell and connect them to each other through the electrode ears of each electrode assembly, wherein the electrode ears of each electrode assembly are located between two adjacent main bodies.

[0192] S02 The shell processing step includes: the convex portion divides the inner cavity into a second accommodating space located between two adjacent first accommodating spaces, so as to accommodate the tab in the second accommodating space.

[0193] Since the two electrode assemblies located in the adjacent first accommodation spaces are supported by the protrusions, the risk of the two adjacent electrode assemblies moving along the length direction and causing the pole ears in the second accommodation space to tear is reduced, thereby protecting the pole ears and improving the service life of the battery.

[0194] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein 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 claims and 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. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: A shell having an inner cavity, wherein the inner side surface of the shell is provided with at least one convex portion protruding toward the inner cavity, wherein the convex portion divides the inner cavity into at least two first accommodating spaces spaced apart and distributed along the length direction of the shell; Multiple electrode assemblies, each of which includes a main body and a tab connected to the main body, each of the first accommodating spaces accommodates at least one main body of the electrode assembly, and at least a portion of the protrusion is located between two adjacent main bodies to block the two adjacent main bodies.

2. The battery according to claim 1, characterized in that The convex portion abuts against two adjacent main body portions, respectively.

3. The battery according to claim 1 or 2, characterized in that: Insulating parts are respectively arranged between the convex part and two adjacent main body parts.

4. The battery according to any one of claims 1 to 3, characterized in that A second accommodating space is formed between two adjacent first accommodating spaces, and the tabs of two adjacent electrode assemblies are connected and accommodated in the second accommodating space.

5. The battery according to any one of claims 1 to 4, characterized in that The outer side surface of the shell is provided with at least one recessed portion recessed inwardly, and the positions of the recessed portions correspond to the positions of the protruding portions respectively.

6. The battery according to any one of claims 1 to 5, characterized in that The housing includes a plurality of side walls, wherein the plurality of side walls include two opposite first side walls and two opposite second side walls. The convex portion is respectively provided at the same position along the length direction on the inner side surface of each of the first side walls, and / or the convex portion is respectively provided at the same position along the length direction on the inner side surface of each of the second side walls.

7. The battery according to claim 6, characterized in that The convex portions are respectively arranged at the same position along the length direction on the inner side surface of each of the first side walls, and the surface area of ​​the first side wall is smaller than the surface area of ​​the second side wall.

8. The battery according to any one of claims 1 to 7, characterized in that The shell has a width direction and a height direction, the width direction is perpendicular to the height direction and both are perpendicular to the length direction, and the size of the shell along the length direction is larger than the size along the width direction and larger than the size along the height direction.

9. The battery according to any one of claims 1 to 8, characterized in that The edge of the protrusion has a chamfer.

10. The battery according to any one of claims 1 to 9, characterized in that A surface of the protrusion facing the main body includes a flat surface.

11. The battery according to any one of claims 1 to 10, characterized in that Along the length direction, the lengths of two adjacent first accommodating spaces are the same or different.

12. The battery according to any one of claims 1 to 11, characterized in that A plurality of the electrode assemblies are connected in parallel or in series.

13. The battery according to any one of claims 1 to 12, characterized in that The main body is a winding structure or a laminated structure.

14. The battery according to any one of claims 1 to 13, characterized in that The battery also includes: Positive terminal and negative terminal; The tabs of each electrode assembly include a positive tab and a negative tab, the positive terminal is connected to the positive tab, and the negative terminal is connected to the negative tab.

15. The battery according to claim 14, characterized in that The battery also includes: An end cover, disposed on the housing; The positive terminal and the negative terminal are arranged on the end cover.

16. The battery according to claim 15, characterized in that The end cover is disposed at at least one end of the shell along the length direction.

17. The battery according to claim 14, characterized in that The battery also includes: An end cover, disposed on the housing; One of the positive terminal and the negative terminal is provided on the end cover, and the other is connected to the housing.

18. The battery according to any one of claims 14 to 17, characterized in that There are n electrode assemblies, and along the length direction, all the positive electrode tabs and all the negative electrode tabs of the first electrode assembly are arranged at one end of the main body of the first electrode assembly facing the second electrode assembly, and both ends of the main body of all the electrode assemblies except the first electrode assembly are provided with the positive electrode tab and the negative electrode tab, The positive terminal and the negative terminal are both located at one end of the shell adjacent to the nth electrode assembly along the length direction, and the positive terminal and the negative terminal are respectively connected to the positive electrode tab and the negative electrode tab at one end of the main body of the nth electrode assembly away from the n-1th electrode assembly, where n is a natural number greater than 1.

19. The battery according to any one of claims 14 to 17, characterized in that: Along the length direction, the end of the main body of the first electrode assembly away from the second electrode assembly is provided with the positive electrode tab, the end of the main body of the nth electrode assembly away from the n-1th electrode assembly is provided with the negative electrode tab, and the opposite ends of the main bodies of two adjacent electrode assemblies are both provided with the positive electrode tab and the negative electrode tab. The positive terminal and the negative terminal are respectively located at opposite ends of the shell along the length direction, the positive terminal is connected to the positive electrode tab of the first electrode assembly, and the negative terminal is connected to the negative electrode tab of the nth electrode assembly, where n is a natural number greater than 1.

20. A battery module, characterized in that: include: At least one battery according to any one of claims 1 to 19.

21. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 19 or the battery module according to claim 20 for providing electrical energy.

22. An energy storage device, characterized in that: The invention comprises the battery according to any one of claims 1 to 19 or the battery module according to claim 20, wherein the battery is capable of storing electric energy and providing electric energy.

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