CN222395006U - Batteries, battery modules, power consumption devices and energy storage devices - Google Patents

Abstract

The present application discloses a battery, a battery module, an electrical device and an energy storage device. The battery comprises: a shell; a battery cell group, which is arranged in the shell, and the battery cell group comprises n electrode assemblies, which are arranged along the first direction of the battery cell group and are electrically connected, and n is a natural number greater than or equal to 2, and each electrode assembly comprises a main body and a positive pole ear and a negative pole ear connected to the main body, and the two ends of two adjacent main bodies facing each other are respectively provided with a positive pole ear and a negative pole ear; a positive terminal, which is connected to the positive pole ear and is insulated from the shell, and the negative pole ear is electrically connected to at least part of the shell. Through the present application, it has the advantages of high grouping efficiency and low cost.

Description

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

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery, a battery module, an electric device, and an energy storage device.

Background

New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like.

In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side. In these application scenarios, higher demands are placed on battery grouping efficiency and battery manufacturing costs.

Disclosure of utility model

In order to solve the technical problems, the application provides a battery, a battery module, an electricity utilization device and an energy storage device which are high in grouping efficiency and low in cost.

The application is realized by the following technical scheme.

The first aspect of the application provides a battery, which comprises a shell, a battery cell group and a positive terminal, wherein the battery cell group is arranged in the shell and comprises n electrode assemblies, the n electrode assemblies are arranged along a first direction of the battery cell group and are electrically connected, n is a natural number greater than or equal to 2, each electrode assembly comprises a main body part, a positive electrode tab and a negative electrode tab which are connected with the main body part, the positive electrode tab and the negative electrode tab are respectively arranged at two ends of two adjacent main body parts, which are opposite to each other, the positive electrode tab and the negative electrode tab are respectively arranged at two opposite ends of the two adjacent main body parts, the positive electrode terminal is connected with the positive electrode tab and is mutually insulated from the shell, and the negative electrode tab is electrically connected with at least part of the shell.

Because negative pole utmost point ear is connected with the casing is electrically conductive for the casing is negatively charged, when a plurality of batteries are in groups, conveniently adjusts the hookup location of converging part and casing, helps promoting long sword shape battery's group efficiency, adapts to more application scenarios, and can save the negative pole utmost point post, the cost is reduced.

In some embodiments, the housing is a metal housing.

Therefore, the whole shell is negatively charged, the connection position of the converging component and the shell is further conveniently adjusted, and the grouping efficiency of the long-blade battery is improved.

In some embodiments, the case includes a negative electrode connection part connected to the negative electrode tab, all the positive electrode tab and all the negative electrode tab of the 1 st electrode assembly are connected to an end of the 1 st main body part adjacent to the 2 nd electrode assembly along the first direction, both ends of the main body parts of the electrode assemblies except the 1 st electrode assembly are provided with the positive electrode tab and the negative electrode tab, the positive electrode tab is connected to the positive electrode tab of the nth electrode assembly, the negative electrode tab of the nth electrode assembly is connected to the negative electrode connection part, and both the positive electrode terminal and the negative electrode connection part are located on the same side of the case along the first direction.

In some embodiments, the housing includes a first face and a second face connected, the first face being located at one end of the housing along the first direction, the second face being adjacent to the first face, the positive terminal and the negative connection being both located at the first face, or one of the positive terminal and the negative connection being located at the first face, the other being located at the second face.

In some embodiments, the positive electrode tab of the 1 st electrode assembly is connected to the end of the 1 st main body portion, which is far away from the 2 nd electrode assembly, the negative electrode tab of the n-th electrode assembly is connected to the end of the n-th main body portion, which is far away from the n-1 st electrode assembly, along the first direction, the positive electrode terminal is connected to the positive electrode tab of the 1 st electrode assembly, the negative electrode tab of the n-th electrode assembly is connected to the negative electrode connection portion, and the positive electrode terminal and the negative electrode connection portion are respectively located on opposite sides of the case along the first direction.

In some embodiments, the case includes two first faces opposite along the first direction and second faces adjacent to and connected to the first faces, respectively, the positive electrode terminal and the negative electrode connection portion being located on the two first faces, respectively, or one of the positive electrode terminal and the negative electrode connection portion being located on one of the two first faces, and the other being located on the second face.

In some embodiments, the battery pack further comprises an end cover arranged at the opening end of the shell, and the positive terminal is arranged at the shell.

In some embodiments, the battery pack further comprises an end cap disposed at the open end of the housing, the positive terminal being disposed at the end cap.

In some embodiments, the positive electrode tabs of adjacent two of the electrode assemblies are connected to each other along the first direction, and the negative electrode tabs of adjacent two of the electrode assemblies are connected to each other.

In some embodiments, the anode tab and the cathode tab connected to each other each include a first welding region and a second welding region located at the first welding region, the first welding region on the anode tab is used for welding a plurality of anode tabs of the anode tab, the first welding region on the cathode tab is used for welding a plurality of cathode tabs of the cathode tab, the second welding region on the anode tab is used for welding anode tabs of two adjacent electrode assemblies, and the second welding region on the cathode tab is used for welding cathode tabs of two adjacent electrode assemblies.

The first welding printing area is formed through pre-welding, the second welding printing area is formed through final welding in the first welding printing area, the risk of tab cold joint can be reduced or avoided, and the connection reliability is improved.

In some embodiments, the positive electrode tabs of two adjacent electrode assemblies are directly connected or connected through a tab, and the negative electrode tabs of two adjacent electrode assemblies are directly connected or connected through a tab.

In some embodiments, the body portion is a coiled structure or a laminated structure.

In some embodiments, the material of the shell is aluminum or copper or stainless steel or aluminum alloy or copper alloy.

In some embodiments, the housing has a dimension along the first direction that is greater than a dimension along the second direction and greater than a dimension along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other.

In some embodiments, the housing has a dimension in the first direction of 400mm to 1400mm, the housing has a dimension in the second direction of 60mm to 140mm, and the housing has a dimension in the third direction of 15mm to 35mm.

A second aspect of an embodiment of the present application provides a battery module, including at least one battery provided in the first aspect.

A third aspect of an embodiment of the present application provides an electric device including the battery for supplying electric power provided in the first aspect or the battery module provided in the second aspect.

A fourth aspect of an embodiment of the present application provides an energy storage device, including the battery provided in the first aspect or the battery module provided in the second aspect, where the battery is capable of storing electric energy and providing electric energy.

The utility model has the following effects:

according to the embodiment of the application, the battery has the characteristics of high grouping efficiency and low cost.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery module according to some embodiments of the present application;

FIG. 3 is an exploded view of a battery provided in some embodiments of the application;

FIG. 4 is a schematic view of a housing according to some embodiments of the present application;

FIG. 5 is a schematic view of an electrode assembly according to some embodiments of the present application;

FIG. 6 is a schematic view of a housing according to other embodiments of the present application;

FIG. 7 is a schematic view of a housing according to still other embodiments of the present application;

FIG. 8 is an enlarged schematic view of a portion of FIG. 5;

Fig. 9 is a schematic structural diagram of a battery according to some embodiments of the present application.

Reference numerals illustrate:

Vehicle 1000, battery module 100, controller 200, motor 300, battery 1, base plate 2, cover 3, case 10, negative electrode connection 11, first face 101, second face 102, electrode assembly 20, main body 21, positive tab 211, negative tab 212, first weld zone 201, second weld zone 202, end cap 30, positive terminal 41, and bracket 50.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are orientation or positional relationship based on the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and other terms such as "fixed" are to be construed broadly as referring to either a fixed connection, a removable connection, or an integral body, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

In the embodiment of the application, the battery can be a secondary battery, and the secondary battery can be used continuously by activating the active material in a charging mode after the battery is discharged.

The battery may be a lithium 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 by the embodiment of the application.

The battery generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charge and discharge of the battery, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO ₄ (which may also be referred to simply as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO ₄), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon.

In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., 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.

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

In some embodiments, the separator is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

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

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of folded sections arranged in a stacked manner, with one positive electrode sheet sandwiched between adjacent folded sections.

As an example, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement.

As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.

As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.

In some embodiments, the electrode assembly may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

In some embodiments, the battery may include a housing. The case is used for packaging the electrode assembly, electrolyte and the like. The shell 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), an aluminum-plastic film or the like.

As an example, the battery may be a cylindrical battery, a prismatic battery including a blade-shaped battery, a polygonal-prismatic battery such as a hexagonal-prismatic battery, or the like, a pouch battery, or other shaped battery, and the present application is not particularly limited.

In some embodiments, the case is provided with an opening, at which an end cap is provided, the end cap closing the opening to form a closed space for accommodating the electrode assembly, electrolyte, and the like. The housing may be provided with one or more openings. One or more end caps may also be provided.

In some embodiments, a pressure relief mechanism is provided on the housing. The pressure release mechanism is used for releasing the internal pressure of the battery.

In some embodiments, the battery module of embodiments of the present application includes one or more batteries to provide a single physical module of higher voltage and capacity. When a plurality of batteries are provided, the batteries are connected in series, in parallel or in series-parallel through the bus component. The plurality of cells are arranged and fixed to form one cell module.

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

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

The present application will be described in detail below.

Currently, new energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side.

In these application scenarios, the battery type is different depending on the application scenario. For example, in an application scenario requiring a long-strip-shaped battery, the arrangement position of the electrode terminals limits the battery grouping efficiency, and currently, there is also a higher demand for the manufacturing cost of the battery.

The application provides a battery, which comprises a shell, a battery core group and a positive terminal, wherein the battery core group is arranged in the shell and comprises n electrode assemblies, the n electrode assemblies are arranged along a first direction of the battery core group and are electrically connected, n is a natural number greater than or equal to 2, each electrode assembly comprises a main body part, a positive electrode tab and a negative electrode tab which are connected with the main body part, the positive electrode tab and the negative electrode tab are respectively arranged at two opposite ends of the adjacent two main body parts, and the positive electrode terminal is connected with the positive electrode tab and insulated from the shell and is electrically connected with at least part of the shell.

Because negative pole utmost point ear is connected with the casing is electrically conductive for the casing is negatively charged, when a plurality of batteries are in groups, the adjustment of being convenient for converges the hookup location of flow component and casing, helps promoting battery group efficiency, even adapts to more application scenes to rectangular shape, and can save the negative pole utmost point post, the cost is reduced.

The embodiment of the application provides an electric device comprising the battery or the battery module for providing electric energy, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

In the following embodiments, for convenience of explanation, the electric device according to an embodiment of the present application will be described by taking the vehicle 1000 as an example. The following description refers to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. As shown in fig. 1, the battery module 100 is provided in the interior of the vehicle 1000, and the battery module 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery module 100 may be used for power supply of the vehicle 1000, for example, the battery module 100 may serve as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery module 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the application, the battery module 100 may not only serve as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, providing driving power for the vehicle 1000 instead of or in part instead of fuel oil or natural gas.

Fig. 2 is an exploded view of a battery module 100 according to an embodiment of the present application. As shown in fig. 2, the battery module 100 includes a case, which may include a base plate 2 and a cover 3, and at least one battery 1, the cover 3 being covered over the base plate 2, thereby forming an accommodating space of the battery 1 between the base plate 2 and the cover 3.

In the battery module 100, the plurality of batteries 1 may be connected in series, parallel, or a series-parallel connection between the plurality of batteries 1, and the series-parallel connection means that the plurality of batteries 1 are connected in series or parallel. The batteries 1 can be directly connected in series or parallel or in parallel, and then the whole formed by the batteries 1 is placed in the accommodating space formed by the bottom plate 2 and the cover body 3, and of course, the battery module 100 can also be in a form of a module unit formed by connecting the batteries 1 in series or parallel or in parallel, and then the plurality of module units are connected in series or parallel or in parallel to form a whole and are accommodated in the accommodating space formed by the bottom plate 2 and the cover body 3. The battery module 100 may further include other structures, for example, the battery module 100 may further include a bus bar member for making electrical connection between the plurality of batteries 1.

Some embodiments of the present application are described in detail below with reference to fig. 3 to 8.

The embodiment of the application provides a battery 1, which comprises a shell 10, a battery cell group arranged in the shell 10, wherein the battery cell group comprises n electrode assemblies 20, n electrode assemblies 20 are arranged along a first direction X of the battery cell group and are electrically connected, n is a natural number greater than or equal to 2, each electrode assembly 20 comprises a main body part 21, a positive electrode tab 211 and a negative electrode tab 212 which are connected with the main body part 21, two ends of two adjacent main body parts 21 which are opposite to each other are respectively provided with the positive electrode tab 211 and the negative electrode tab 212, a positive electrode terminal 41 is connected with the positive electrode tab 211 and insulated from the shell 10, and the negative electrode tab 212 is electrically connected with at least part of the shell 10.

The case 10 may be cylindrical, prismatic, or other, and the prismatic case may include a blade-shaped (rectangular parallelepiped-shaped) case, a polygonal-prism case, which may be, for example, a hexagonal-prism case, or the like, and the present application is not particularly limited.

As an example, referring to fig. 3, the case 10 has a length direction X, a width direction Y, and a height direction Z, wherein the length direction X of the case 10 has a size greater than the width direction Y and greater than the height direction Z. The length direction X, the width direction Y and the height direction Z are perpendicular to each other. As an example, the size in the width direction Y of the housing 10 is larger than the size in the height direction Z, thereby constituting a blade-shaped housing. In the following description, the longitudinal direction X, the width direction Y, and the height direction Z may also be denoted as a first direction X, a second direction Y, and a third direction Z.

In some embodiments, referring to fig. 9, the dimension L1 of the housing 10 along the first direction X is a length dimension, the length dimension ranges from 400mm to 1400mm, the dimension L2 of the housing 10 along the second direction Y is a width dimension, the width dimension ranges from 60mm to 140mm, the dimension of the housing 10 along the third direction Z is a height dimension (thickness dimension), and the height dimension ranges from 15mm to 35mm. It is to be noted that the dimension in the longitudinal direction X of the housing 10 is the distance between the planes of the two end caps 30 arranged in the longitudinal direction X at which the pole positions are not provided, the dimension in the width direction Y is the distance between the two faces of the housing opposite in the width direction Y (the positions at which the protrusions 11 are not provided), and the dimension in the height direction Z is the distance between the two faces of the housing opposite in the height direction Z.

The n electrode assemblies 20 are sequentially arranged to form a rectangular parallelepiped battery cell group, which may include a plurality of electrode assemblies 20 arranged along the third direction Z. The battery cell group has a length, a width and a thickness, wherein the length is greater than the width and greater than the thickness, the length is a dimension along a first direction X, the width is a dimension along a second direction Y, and the thickness is a dimension along a third direction Z. In some embodiments, the cell stack has a width that is greater than a thickness, thereby forming a similar elongate blade stack.

The case 10 has an inner cavity for accommodating the electrode assembly 20.

The main body 21 of each electrode assembly 20 includes a positive electrode tab, a negative electrode tab, and a separator between the positive electrode tab and the negative electrode tab, the positive electrode tab 211 is connected to the positive electrode tab, and the negative electrode tab 212 is connected to the negative electrode tab. In some embodiments, the positive electrode tab, separator, and negative electrode tab of the body portion 21 are stacked in order in a wound or laminated configuration. The n electrode assemblies 20 may be connected in series or in parallel.

The two ends of the adjacent two main body portions 21 facing each other are provided with a positive electrode tab 211 and a negative electrode tab 212, respectively, and the positive electrode tab 211 and the negative electrode tab 212 are located between the adjacent two main body portions 21.

The positive electrode tab 211 of one of the adjacent two electrode assemblies 20 is connected with the positive electrode tab 211 of the other, the negative electrode tab 212 of one of the adjacent two electrode assemblies 20 is connected with the negative electrode tab 212 of the other, so that the adjacent two electrode assemblies 20 are connected in parallel, or the positive electrode tab 211 of one of the adjacent two electrode assemblies 20 is connected with the negative electrode tab 212 of the other, and the negative electrode tab 212 of one of the adjacent two electrode assemblies 20 is connected with the positive electrode tab 211 of the other, so that the adjacent two electrode assemblies 20 are connected in series.

The positive electrode terminal 41 is connected to the positive electrode tab 211 and insulated from the case 10, and the negative electrode tab 212 is electrically connected to at least part of the case 10.

The positive electrode terminal 41 and the positive electrode tab 211 may be directly connected or may be connected by a switching member.

The positive electrode terminal 41 may be provided to the end cap 30 or to the case 10.

The negative electrode tab 212 may be electrically connected to the casing 10 at least partially by the casing 10 being electrically conductive, so that the casing 10 is negatively charged as a whole, for example, the casing 10 may be a metal casing, for example, aluminum or copper or stainless steel or aluminum alloy or copper alloy, or the casing 10 may be partially electrically conductive, so that the casing 10 is partially negatively charged, for example, the casing 10 is made of a plastic material with a portion of metal material embedded therein.

The positive electrode terminal 41 and the case 10 may be used to connect with a bus member through which the plurality of batteries 1 are connected to form a battery module, for example, the plurality of batteries 1 may be connected in series or in parallel. The positive terminal 41 may sometimes be referred to as a positive electrode post.

Because the negative electrode tab 212 is electrically connected with the casing 10, the casing 10 is negatively charged, when a plurality of batteries 1 are grouped, the connection position of the bus component and the casing 10 is conveniently adjusted, the grouping efficiency of the batteries is improved, the negative electrode tab can be omitted, and the cost is reduced.

In some embodiments, referring to fig. 4 and 5, the case 10 includes a negative electrode connection part 11, the negative electrode connection part 11 is connected with a negative electrode tab 212, all positive electrode tabs 211 and all negative electrode tabs 212 of the 1 st electrode assembly 20 are connected to ends of the 1 st body part 21 adjacent to the 2 nd electrode assembly 20 along a first direction X (length direction), both ends of the body part 21 of the electrode assembly 20 except for the 1 st electrode assembly 20 are provided with positive electrode tabs 211 and negative electrode tabs 212, a positive electrode terminal 41 is connected with the positive electrode tab 211 of the nth electrode assembly 20, the negative electrode tab 212 of the nth electrode assembly 20 is connected with the negative electrode connection part 11, and the positive electrode terminal 41 and the negative electrode connection part 11 are located on the same side of the case 10 along the first direction X.

The negative electrode connection portion 11 may be a part of the case 10 and may be integrally formed with the case 10, or may be a separate structure, and the separate structure may be that the negative electrode connection portion 11 is connected to the case 10, for example, by clamping, screwing, bonding, or other suitable connection means.

Along the first direction X, all the positive electrode tabs 211 and all the negative electrode tabs 212 of the 1 st electrode assembly 20 are connected to the end of the body portion 21 of the 1 st electrode assembly 20 adjacent to the 2 nd electrode assembly 20, and may be an end electrode tab lead-out of the body portion 21 of the 1 st electrode assembly 20, which is far from the 2 nd electrode assembly 20, and an end of the body portion 21 of the 1 st electrode assembly 20, which faces the 2 nd electrode assembly 20, leads out the positive electrode tabs 211 and the negative electrode tabs 212.

Along the length direction X, both ends of the main body portion 21 of all the electrode assemblies 20 except the 1 st electrode assembly 20 are provided with the positive electrode tab 211 and the negative electrode tab 212, and the 2 nd, 3 rd, 4 th.

Along the first direction X, the positive electrode terminal 41 and the negative electrode connecting part 11 may each be located at a side adjacent to the nth electrode assembly 20.

As an example, referring to fig. 4 and 5, a positive terminal 41 and a negative electrode connection part 11 may be provided at one end of the case 10 on the n-th (e.g., 2-th) electrode assembly 20 side along the first direction X, the positive terminal 41 being electrically connected to the positive tab 211 of the n-th (e.g., 2-th) electrode assembly 20, and an insulating member 42 being provided between the positive terminal 41 and the case 10. The negative electrode connection part 11 may be a protrusion protruding outward from the inner wall of the case 10, thereby forming an accommodating space accommodating the negative electrode tab 212 on the inner wall, and the negative electrode tab 212 abuts against the negative electrode connection part 11 to achieve conductive connection. Of course, the negative electrode connection portion 11 may be electrically connected to the first surface 101 of the case 10 with the negative electrode tab 212 abutting against the first surface 101.

The positive electrode terminal 41 and the negative electrode connection portion 11 are both located on the same side of the case 10 along the first direction X, which is advantageous in improving the battery assembly efficiency.

In some embodiments, the housing 10 includes a first face 101 and a second face 102 that are connected, the first face 101 being located at one end of the housing 10 along the first direction X, the second face 102 being adjacent to the first face 101. Referring to fig. 4, both the positive electrode terminal 41 and the negative electrode connection portion 11 are located on the first surface 101. Or one of the positive electrode terminal 41 and the negative electrode connection portion 11 is located on the first surface 101, and the other is located on the second surface 102. Referring to fig. 6, as an example, the positive electrode terminal 41 is provided on the first surface 101, and the negative electrode connection portion 11 is provided on the second surface 102.

The first face 101 is a face (end face) of the case 10 adjacent to the nth (e.g., 2 nd) electrode assembly 20 along the first direction X. The second face 102 may be a face (narrow face) of the housing 10 along the second direction Y or a face (large face) along the third direction Z.

In some embodiments, referring to fig. 3, the positive electrode tab 211 of the 1 st electrode assembly 20 is connected to an end of the 1 st body portion, which is far from the 2 nd electrode assembly 20, the negative electrode tab 212 of the n-th electrode assembly is connected to an end of the n-th body portion 21, which is far from the n-1 st electrode assembly 20, along the first direction X, the positive electrode terminal 41 is connected to the positive electrode tab 211 of the 1 st electrode assembly 20, the negative electrode tab 212 of the n-th electrode assembly 20 is connected to the negative electrode connection portion 11, and the positive electrode terminal 41 and the negative electrode connection portion 11 are located at opposite sides of the case 10 along the first direction X, respectively.

Along the length direction X, the end of the main body portion 21 of the 1 st electrode assembly 20, which is far away from the 2 nd electrode assembly 20, is provided with a positive electrode tab 211 and may have no negative electrode tab, and the end of the main body portion 21 of the n-th electrode assembly 20, which is far away from the n-1 st electrode assembly 20, is provided with a negative electrode tab 212 and may have no positive electrode tab. 2 nd, 3 rd the positive electrode tab 211 and the negative electrode tab 212 are drawn out from both ends of the n-1 th electrode assembly 20.

Along the length direction X, the positive electrode terminal 41 is located at one end of the case 10 adjacent to the 1 st electrode assembly 20, and the negative electrode connection part 11 is located at one end of the case 10 adjacent to the n-th electrode assembly 20, i.e., the positive electrode terminal 41 and the negative electrode connection part 11 are located at opposite sides of the case 10, respectively.

As an example, referring to fig. 3, along the length direction X, an opening 12 is provided at one end of the case 10 adjacent to the 1 st electrode assembly 20, one end adjacent to the n-th electrode assembly 20 is a closed end, a plurality of electrode assemblies 20 are located in the case 10, an end cover 30 is provided at the opening 12, a positive terminal 41 may be provided at the end cover 30, the positive terminal 41 is connected with a positive tab 211 of the 1 st electrode assembly 20, a negative electrode connection part 11 is a first face 101 of the case 10 adjacent to the n-th electrode assembly 20, and a negative electrode tab 212 of the n-th electrode assembly 20 abuts against the first face 101, thereby realizing negatively charging of the case 10.

Of course, the positive electrode terminal 41 may be provided in the case 10 and insulated from the case 10, instead of the end cap 30.

In some embodiments, the case 10 includes two first faces 101 opposite along the first direction X and second faces 102 adjacent and connected to the first faces 101, respectively, the positive electrode terminal 41 and the negative electrode connection portion 11 are located at the two first faces 101, respectively, or referring to fig. 7, one of the positive electrode terminal 41 and the negative electrode connection portion 11 is located at one of the two first faces 101, and the other is located at the second face 102.

In some embodiments, referring to fig. 8, the interconnected positive electrode tabs 211 and the interconnected negative electrode tabs 212 of two adjacent electrode assemblies 20 each include a first welding region 201 and a second welding region 202 located at the first welding region 201, the first welding region 201 on the positive electrode tab 211 is used to weld a plurality of positive electrode tabs of the positive electrode tab 211, the first welding region 201 on the negative electrode tab 212 is used to weld a plurality of negative electrode tabs of the negative electrode tab 212, the second welding region 202 on the positive electrode tab 211 is used to weld the positive electrode tab 211 of two adjacent electrode assemblies 20, and the second welding region 202 on the negative electrode tab 212 is used to weld the negative electrode tab 212 of two adjacent electrode assemblies 20.

The plurality of positive electrode tabs of the positive electrode tab 211 and the plurality of negative electrode tabs of the negative electrode tab 212 may be subjected to a pre-welding process (e.g., ultrasonic welding), first welding lands 201 are formed on the positive electrode tab 211 and the negative electrode tab 212, and then the interconnected positive electrode tab 211 and the interconnected negative electrode tab 212 are respectively finish-welded in the respective first welding lands 201 by ultrasonic welding or laser welding, thereby forming the second welding lands 202.

The first welding area 201 is formed through pre-welding, and the second welding area 201 is formed through final welding in the first welding area 201, so that the risk of tab cold joint can be reduced or avoided, and the connection reliability is improved.

In some embodiments, a holder 50 is disposed between adjacent two electrode assemblies 20, the holder 50 having a receiving space for receiving the positive electrode tab 211 and the negative electrode tab 212, the holder 50 being for supporting the electrode assemblies 20.

In some embodiments, the bracket 50 may include a first bracket and a second bracket, the first bracket and the second bracket being detachably connected, and a receiving space for receiving the positive electrode tab 211 and the negative electrode tab 212 is formed between the first bracket and the second bracket in a state in which the first bracket and the second bracket are connected.

The embodiment of the present application also provides a battery module 100 including at least one of the above-mentioned batteries 1. The battery module 100 may include a plurality of batteries 1, which may be connected by a bus bar member to constitute a battery module, and the plurality of batteries 1 may be connected in series or in parallel or in series-parallel.

The battery module 100 may further include a case in which the battery 1 is accommodated.

The battery module 100 may be a battery module including a plurality of batteries 1 or may be a battery pack including a plurality of batteries 1. In some embodiments, heat exchange devices such as water cooled panels, battery management modules, and the like are also included in the battery pack.

The embodiment of the application also provides an electric device comprising the above-mentioned battery 1 or battery module for providing electric energy.

The embodiment of the application also provides an energy storage device, which comprises the battery, wherein the battery can store electric energy and can provide electric energy.

The embodiments are only used to illustrate the technical scheme of the present application, but not to limit the technical scheme, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical scheme described in the foregoing embodiments may be modified or some or all technical features may be equivalently replaced, and the modification or replacement does not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the present application, and is included in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (18)

1. A battery, comprising:

a housing;

The battery cell group is arranged in the shell and comprises n electrode assemblies, the n electrode assemblies are arranged along the first direction of the battery cell group and are electrically connected, n is a natural number greater than or equal to 2, each electrode assembly comprises a main body part, a positive electrode tab and a negative electrode tab which are connected with the main body part, and the positive electrode tab and the negative electrode tab are respectively arranged at two opposite ends of two adjacent main body parts;

and the positive electrode terminal is connected with the positive electrode lug and is mutually insulated with the shell, and the negative electrode lug is electrically connected with at least part of the shell.

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The shell is a metal shell.

3. The battery according to claim 1 or 2, wherein,

The shell comprises a negative electrode connecting part connected with the negative electrode tab,

Along the first direction, all positive electrode tabs and all negative electrode tabs of the 1 st electrode assembly are connected to the end part of the 1 st main body part adjacent to the 2 nd electrode assembly, both ends of the main body parts of the electrode assemblies except the 1 st electrode assembly are provided with the positive electrode tabs and the negative electrode tabs,

The positive electrode terminal is connected with the positive electrode lug of the nth electrode assembly, and the negative electrode lug of the nth electrode assembly is connected with the negative electrode connecting part;

The positive terminal and the negative electrode connection portion are both located on the same side of the housing along the first direction.

4. The battery of claim 3, wherein the battery is provided with a battery cell,

The shell comprises a first surface and a second surface which are connected, the first surface is positioned at one end of the shell along the first direction, and the second surface is adjacent to the first surface;

the positive electrode terminal and the negative electrode connecting portion are both located on the first face, or one of the positive electrode terminal and the negative electrode connecting portion is located on the first face, and the other is located on the second face.

5. The battery according to claim 1 or 2, wherein,

The shell comprises a negative electrode connecting part connected with the negative electrode tab,

Along the first direction, the positive electrode tab of the 1 st electrode assembly is connected to the end part, far away from the 2 nd electrode assembly, of the 1 st main body part, and the negative electrode tab of the n th electrode assembly is connected to the end part, far away from the n-1 st electrode assembly, of the n th main body part;

the positive electrode terminal is connected with the positive electrode tab of the 1 st electrode assembly, and the negative electrode tab of the nth electrode assembly is connected with the negative electrode connecting part;

The positive terminal and the negative electrode connection portion are located on opposite sides of the housing along the first direction, respectively.

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

The housing includes two first faces opposite along the first direction and second faces adjacent to and connected with the first faces respectively,

The positive electrode terminal and the negative electrode connecting part are respectively positioned on the two first surfaces, or one of the positive electrode terminal and the negative electrode connecting part is positioned on one of the two first surfaces, and the other is positioned on the second surface.

7. The battery according to any one of claims 1 to 6, further comprising:

an end cover arranged at the opening end of the shell,

The positive terminal is arranged on the shell.

8. The battery according to any one of claims 1 to 6, further comprising:

The end cover is arranged at the opening end of the shell, and the positive electrode terminal is arranged at the end cover.

9. The battery according to any one of claims 1 to 8, wherein,

Along the first direction, the positive electrode tabs of two adjacent electrode assemblies are connected with each other, and the negative electrode tabs of two adjacent electrode assemblies are connected with each other.

10. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

The positive electrode tab and the negative electrode tab which are connected with each other all comprise a first welding area and a second welding area which is positioned in the first welding area, the first welding area on the positive electrode tab is used for welding a plurality of positive electrode tab pieces of the positive electrode tab, the first welding area on the negative electrode tab is used for welding a plurality of negative electrode tab pieces of the negative electrode tab, the second welding area on the positive electrode tab is used for welding two adjacent positive electrode tab pieces of the electrode assembly, and the second welding area on the negative electrode tab is used for welding two adjacent negative electrode tab pieces of the electrode assembly.

11. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

The positive electrode tabs of two adjacent electrode assemblies are directly connected or connected through a transfer sheet,

The negative electrode tabs of two adjacent electrode assemblies are directly connected or connected through a transfer sheet.

12. The battery according to any one of claims 1 to 11, wherein,

The main body part is a winding structure or a lamination structure.

13. The battery according to any one of claims 1 to 12, wherein,

The shell is made of aluminum or copper or stainless steel or aluminum alloy or copper alloy.

14. The battery according to any one of claims 1 to 13, wherein,

The size of the shell along the first direction is larger than the size along the second direction and larger than the size along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

15. The battery of claim 14, wherein the battery is configured to provide the battery with a plurality of cells,

The size of the shell along the first direction is 400-1400 mm, the size of the shell along the second direction is 60-140 mm, and the size of the shell along the third direction is 15-35 mm.

16. A battery module, comprising:

at least one battery according to any one of claims 1-15.

17. An electrical device comprising the battery of any one of claims 1-15 or the battery module of claim 16 for providing electrical energy.

18. An energy storage device comprising a battery according to any one of claims 1-15 or a battery module according to claim 16, said battery being capable of storing electrical energy and providing electrical energy.