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. A battery includes: a case; the battery cell group is arranged in the shell, the battery cell group comprises n electrode assemblies, the n electrode assemblies are arranged in the first direction of the battery cell group and are electrically connected, n is a natural number larger than or equal to 2, each electrode assembly comprises a main body part, a positive electrode lug and a negative electrode lug, and the positive electrode lug and the negative electrode lug are connected with the main body part; a positive electrode lug and a negative electrode lug are respectively arranged at two opposite ends of two adjacent main body parts; the positive terminal is connected with the positive tab and is insulated from the shell, and the negative tab is conductively connected with at least part of the shell. The method has the advantages of being high in grouping efficiency and low in cost.

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 placed on battery group efficiency and battery manufacturing costs. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery, a battery module, an electrical device and an energy storage device with high grouping efficiency and low cost.

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

[0006] The first aspect of the present application provides a battery, comprising: a shell; a battery cell group, arranged in the shell, the battery cell group comprising 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 of the electrode assemblies comprises a main body and a positive electrode tab and a negative electrode tab connected to the main body, the positive electrode tab and the negative electrode tab are respectively provided at two ends of two adjacent main bodies facing each other; a positive terminal, connected to the positive electrode tab and insulated from the shell, the negative electrode tab is conductively connected to at least part of the shell.

[0007] Since the negative electrode tab is conductively connected to the shell, the shell is negatively charged. When multiple batteries are grouped, it is convenient to adjust the connection position of the busbar component and the shell, which helps to improve the grouping efficiency of the long blade-shaped batteries, adapt to more application scenarios, and can eliminate the negative electrode post, reducing costs.

[0008] In some embodiments, the housing is a metal housing.

[0009] As a result, the entire shell is negatively charged, which further facilitates adjustment of the connection position between the busbar component and the shell, thereby improving the grouping efficiency of the long blade-shaped batteries.

[0010] In some embodiments, the shell includes a negative electrode connecting portion connected to the negative electrode tab, and along the first direction, all the positive electrode tabs and all the negative electrode tabs of the first electrode assembly are connected to the end of the first main body adjacent to the second electrode assembly; the positive electrode tab and the negative electrode tab are provided at both ends of the main body of the electrode assemblies other than the first electrode assembly, the positive terminal is connected to the positive electrode tab of the nth electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the negative electrode connecting portion; the positive terminal and the negative electrode connecting portion are both located on the same side of the shell along the first direction.

[0011] In some embodiments, the shell includes a first surface and a second surface connected to each other, the first surface is located at one end of the shell along the first direction, and the second surface is adjacent to the first surface; the positive terminal and the negative electrode connection portion are both located on the first surface; or one of the positive terminal and the negative electrode connection portion is located on the first surface, and the other is located on the second surface.

[0012] In some embodiments, along the first direction, the positive electrode tab of the first electrode assembly is connected to the end of the first main body away from the second electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the end of the nth main body away from the n-1th electrode assembly; the positive terminal is connected to the positive electrode tab of the first electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the negative electrode connecting portion; the positive terminal and the negative electrode connecting portion are respectively located on opposite sides of the shell along the first direction.

[0013] In some embodiments, the shell includes two first surfaces opposite to each other along the first direction and second surfaces respectively adjacent to and connected to the first surfaces, and the positive terminal and the negative electrode connecting part are respectively located on the two first surfaces; or one of the positive terminal and the negative electrode connecting part is located on one of the two first surfaces, and the other is located on the second surface.

[0014] In some embodiments, it also includes: an end cap, which is arranged at the open end of the shell, and the positive terminal is arranged at the shell.

[0015] In some embodiments, it also includes: an end cover, which is arranged at the open end of the shell, and the positive terminal is arranged at the end cover.

[0016] In some embodiments, along the first direction, the positive electrode tabs of two adjacent electrode assemblies are connected to each other, and the negative electrode tabs of two adjacent electrode assemblies are connected to each other.

[0017] In some embodiments, the interconnected positive electrode tabs and the interconnected negative electrode tabs both include a first weld print area and a second weld print area located in the first weld print area, the first weld print area on the positive electrode tab is used to weld multiple positive electrode tab sheets of the positive electrode tab, the first weld print area on the negative electrode tab is used to weld multiple negative electrode tab sheets of the negative electrode tab, the second weld print area on the positive electrode tab is used to weld the positive electrode tabs of two adjacent electrode assemblies, and the second weld print area on the negative electrode tab is used to weld the negative electrode tabs of two adjacent electrode assemblies.

[0018] By forming a first weld print area through pre-welding and performing final welding in the first weld print area to form a second weld print area, the risk of poor welding of the tab can be reduced or avoided, thereby improving connection reliability.

[0019] In some embodiments, the positive electrode tabs of two adjacent electrode assemblies are directly connected or connected through a converter, and the negative electrode tabs of two adjacent electrode assemblies are directly connected or connected through a converter.

[0020] In some embodiments, the main body is a rolled structure or a laminated structure.

[0021] In some embodiments, the shell is made of aluminum, copper, stainless steel, aluminum alloy, or copper alloy.

[0022] In some embodiments, a dimension of the shell along the first direction is greater than a dimension along the second direction and greater than a dimension along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0023] In some embodiments, a dimension of the shell along the first direction is 400 mm to 1400 mm, a dimension of the shell along the second direction is 60 mm to 140 mm, and a dimension of the shell along the third direction is 15 mm to 35 mm.

[0024] A second aspect of an embodiment of the present application provides a battery module, comprising: at least one battery provided by the first aspect above.

[0025] 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.

[0026] 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.

[0027] Utility model effect:

[0028] Through the embodiments of the present application, the battery has the characteristics of high group efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0031] Figure 2 An exploded schematic diagram of a battery module provided in some embodiments of the present application;

[0032] Figure 3 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0033] Figure 4 A schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0034] Figure 5 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0035] Figure 6 A schematic diagram of the structure of a housing provided in some other embodiments of the present application;

[0036] Figure 7 A schematic diagram of the structure of a housing provided in some other embodiments of the present application;

[0037] Figure 8 for Figure 5 A partial enlarged schematic diagram;

[0038] Fig. 9 A schematic diagram of the structure of a battery provided in some embodiments of the present application.

[0039] Description of reference numerals:

[0040] Vehicle 1000; battery module 100; controller 200; motor 300; battery 1; bottom plate 2; cover 3; shell 10; negative electrode connection portion 11; first surface 101; second surface 102; electrode assembly 20; main body 21; positive electrode tab 211; negative electrode tab 212; first weld print area 201; second weld print area 202; end cap 30; positive terminal 41; bracket 50. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application will be 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.).

[0055] 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.

[0056] 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.

[0057] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0058] 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.

[0059] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the electrode assembly is a laminate structure.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In some embodiments, the battery module may further include a case in which the battery is accommodated.

[0079] 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.

[0080] Below, this application is described in detail.

[0081] 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.

[0082] In these application scenarios, different battery types are used depending on the application scenario. For example, in application scenarios that require long strip batteries, the location of the electrode terminals limits the battery grouping efficiency, and currently, higher requirements are placed on the manufacturing cost of the battery.

[0083] In this regard, the present application provides a battery, comprising: a shell; a cell group, arranged in the shell, the cell group comprising n electrode assemblies, the n electrode assemblies are arranged and electrically connected along a first direction of the cell group, n is a natural number greater than or equal to 2, each electrode assembly comprises a main body and a positive electrode tab and a negative electrode tab connected to the main body, and the positive electrode tab and the negative electrode tab are respectively provided at two ends of two adjacent main bodies facing each other; a positive terminal, connected to the positive electrode tab and insulated from the shell, and the negative electrode tab is conductively connected to at least part of the shell.

[0084] Since the negative electrode tab is conductively connected to the shell, the shell is negatively charged. When multiple batteries are grouped, it is easy to adjust the connection position between the busbar component and the shell, which helps to improve the battery grouping efficiency. Even for long strips, it can adapt to more application scenarios and the negative electrode column can be omitted, reducing costs.

[0085] 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.

[0086] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0087] 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.

[0088] 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.

[0089] Figure 2 FIG. 1 is a schematic diagram of an exploded view of a battery module 100 provided in an embodiment of the present application. Figure 2 As shown, the battery module 100 includes a box body and at least one battery 1. The box body may include a bottom plate 2 and a cover body 3. The cover body 3 covers the bottom plate 2, so as to form a storage space for the battery 1 between the bottom plate 2 and the cover body 3.

[0090] 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. 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 bottom plate 2 and the cover 3; 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 then the multiple module units are connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in the accommodation space formed by the bottom plate 2 and the cover 3. 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.

[0091] Below, refer to Figures 3 to 8 Some embodiments of the present application are described in detail.

[0092] The embodiment of the present application provides a battery 1, comprising: a shell 10; a battery cell group, which is arranged in the shell 10, and the battery cell group includes n electrode assemblies 20, which are arranged and electrically connected along a first direction X of the battery cell group, and n is a natural number greater than or equal to 2, and each electrode assembly 20 includes a main body 21 and a positive electrode tab 211 and a negative electrode tab 212 connected to the main body 21, and the two ends of two adjacent main bodies 21 facing each other are respectively provided with a positive electrode tab 211 and a negative electrode tab 212; a positive terminal 41, which is connected to the positive electrode tab 211 and is insulated from the shell 10, and the negative electrode tab 212 is conductively connected to at least part of the shell 10.

[0093] 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.

[0094] As an example, see Figure 3The 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. The length direction X, the width direction Y and the height direction Z are perpendicular to each other. As an example, the width direction Y of the housing 10 is greater than the height direction Z, thereby forming a blade-shaped housing. In the following description, the length direction X, the width direction Y and the height direction Z may also be expressed as a first direction X, a second direction Y and a third direction Z.

[0095] In some embodiments, see Fig. 9 , the dimension L1 of the shell 10 along the first direction X is the length dimension, and the length dimension ranges from 400mm to 1400mm, the dimension L2 of the shell 10 along the second direction Y is the width dimension, and the width dimension ranges from 60mm to 140mm, and the dimension of the shell 10 along the third direction Z is the height dimension (thickness dimension), and the height dimension ranges from 15mm to 35mm. It is worth noting that the dimension of the shell 10 in the length direction X is the distance between the planes of the two end caps 30 arranged along the length direction X where the pole position is 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 position where the convex part 11 is 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.

[0096] The n electrode assemblies 20 are arranged in sequence to form a rectangular parallelepiped battery cell group, and the battery cell group 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, wherein the length is the dimension along the first direction X, the width is the dimension along the second direction Y, and the thickness is the dimension along the third direction Z. In some embodiments, the width of the battery cell group is greater than the thickness, thereby forming a battery cell group similar to a long knife.

[0097] The housing 10 has an inner cavity for accommodating the electrode assembly 20 .

[0098] The main body 21 of each electrode assembly 20 includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet. The positive electrode tab 211 is connected to the positive electrode sheet, and the negative electrode tab 212 is connected to the negative electrode sheet. In some embodiments, the positive electrode sheet, the separator, and the negative electrode sheet of the main body 21 are sequentially stacked into a winding structure or a stacked structure. The n electrode assemblies 20 can be connected in series or in parallel.

[0099] Two ends of two adjacent main bodies 21 facing each other are respectively provided with a positive electrode tab 211 and a negative electrode tab 212 , and the positive electrode tab 211 and the negative electrode tab 212 are located between the two adjacent main bodies 21 .

[0100] The positive electrode tab 211 of one of two adjacent electrode assemblies 20 is connected to the positive electrode tab 211 of the other, and the negative electrode tab 212 of one of two adjacent electrode assemblies 20 is connected to the negative electrode tab 212 of the other, so that the two adjacent electrode assemblies 20 are connected in parallel; or, the positive electrode tab 211 of one of two adjacent electrode assemblies 20 is connected to the negative electrode tab 212 of the other, and the negative electrode tab 212 of one of two adjacent electrode assemblies 20 is connected to the positive electrode tab 211 of the other, so that the two adjacent electrode assemblies 20 are connected in series.

[0101] The positive electrode terminal 41 is connected to the positive electrode tab 211 and is insulated from the housing 10 , and the negative electrode tab 212 is conductively connected to at least a portion of the housing 10 .

[0102] The positive electrode terminal 41 and the positive electrode tab 211 may be connected directly or through a transition component.

[0103] The positive terminal 41 may be disposed on the end cover 30 , or on the housing 10 .

[0104] The negative electrode tab 212 is at least partially conductively connected to the shell 10, and the shell 10 is entirely conductive, so that the shell 10 is negatively charged as a whole, for example, the shell 10 is a metal shell, and the metal shell can be, for example, aluminum or copper or stainless steel or aluminum alloy or copper alloy, etc.; the shell 10 can also be partially conductive, so that the shell 10 is partially negatively charged, for example, the shell 10 is composed of a plastic material embedded with a part of a metal material.

[0105] The positive terminal 41 and the housing 10 may be used to connect to a busbar component, through which multiple batteries 1 are connected to form a battery module, for example, multiple batteries 1 may be connected in series or in parallel. The positive terminal 41 may sometimes be referred to as a positive pole.

[0106] Since the negative electrode tab 212 is conductively connected to the shell 10, the shell 10 is negatively charged. When multiple batteries 1 are grouped, it is convenient to adjust the connection position between the busbar component and the shell 10, which helps to improve the battery grouping efficiency and can omit the negative electrode column, thereby reducing costs.

[0107] In some embodiments, reference Figure 4 and Figure 5The shell 10 includes a negative electrode connecting portion 11, which is connected to the negative electrode tab 212. Along the first direction X (length direction), all the positive electrode tabs 211 and all the negative electrode tabs 212 of the first electrode assembly 20 are connected to the end of the first main body 21 adjacent to the second electrode assembly 20; both ends of the main body 21 of the electrode assembly 20 other than the first electrode assembly 20 are provided with positive electrode tabs 211 and negative electrode tabs 212, the positive terminal 41 is connected to the positive electrode tab 211 of the nth electrode assembly 20, and the negative electrode tab 212 of the nth electrode assembly 20 is connected to the negative electrode connecting portion 11; the positive terminal 41 and the negative electrode connecting portion 11 are both located on the same side of the shell 10 along the first direction X.

[0108] The negative electrode connection part 11 can be a part of the shell 10 and form an integral structure with the shell 10; it can also be a split structure, in which the negative electrode connection part 11 is connected to the shell 10 by, for example, snap connection, threaded connection, bonding, etc. or other suitable connection methods.

[0109] Along the first direction X, all the positive pole tabs 211 and all the negative pole tabs 212 of the first electrode assembly 20 are connected to the end of the main body 21 of the first electrode assembly 20 adjacent to the second electrode assembly 20. It can be 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, 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.

[0110] 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. The second, third, fourth...nth electrode assemblies may have positive electrode tabs 211 and negative electrode tabs 212 at both ends.

[0111] Along the first direction X, the positive terminal 41 and the negative connection portion 11 may both be located at a side adjacent to the n-th electrode assembly 20 .

[0112] As an example, see Figure 4 and Figure 5, along the first direction X, a positive terminal 41 and a negative electrode connection portion 11 may be provided at one end of the housing 10 located on the side of the nth (e.g., second) electrode assembly 20, the positive terminal 41 being conductively connected to the positive electrode tab 211 of the nth (e.g., second) electrode assembly 20, and an insulating component 42 is provided between the housing 10. The negative electrode connection portion 11 may be a convex portion protruding outward from the inner wall of the housing 10, thereby forming a receiving space for the negative electrode tab 212 on the inner wall, and the negative electrode tab 212 abuts against the negative electrode connection portion 11 to achieve conductive connection. Of course, the negative electrode connection portion 11 may also be the first surface 101 of the housing 10, and the negative electrode tab 212 abuts against the first surface 101 to achieve conductive connection.

[0113] The positive terminal 41 and the negative connection portion 11 are both located on the same side of the housing 10 along the first direction X, which is beneficial to improving the battery assembly efficiency.

[0114] In some embodiments, the housing 10 includes a first surface 101 and a second surface 102 connected to each other, the first surface 101 is located at one end of the housing 10 along the first direction X, and the second surface 102 is adjacent to the first surface 101. Figure 4 , the positive electrode terminal 41 and the negative electrode connecting portion 11 are both located on the first surface 101. Alternatively, one of the positive electrode terminal 41 and the negative electrode connecting portion 11 is located on the first surface 101, and the other is located on the second surface 102. Figure 6 As an example, the positive electrode terminal 41 is disposed on the first surface 101 , and the negative electrode connecting portion 11 is disposed on the second surface 102 .

[0115] The first surface 101 is a surface (end surface) of the housing 10 adjacent to the nth (eg, second) electrode assembly 20 along the first direction X. The second surface 102 may be a surface (narrow surface) of the housing 10 along the second direction Y or a surface (large surface) along the third direction Z.

[0116] In some embodiments, reference Figure 3 , along the first direction X, the positive pole tab 211 of the first electrode assembly 20 is connected to the end of the first main body away from the second electrode assembly 20, and the negative pole tab 212 of the nth electrode assembly is connected to the end of the nth main body 21 away from the n-1th electrode assembly 20; the positive terminal 41 is connected to the positive pole tab 211 of the first electrode assembly 20, and the negative pole tab 212 of the nth electrode assembly 20 is connected to the negative electrode connecting portion 11; the positive terminal 41 and the negative electrode connecting portion 11 are respectively located on opposite sides of the shell 10 along the first direction X.

[0117] 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 may be free of a 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 is free of a positive electrode tab. The second, third, fourth, ... n-1th electrode assemblies 20 have positive electrode tabs 211 and negative electrode tabs 212 drawn out from both ends.

[0118] 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 electrode connection portion 11 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 electrode connection portion 11 are respectively located on opposite sides of the shell 10.

[0119] As an example, see Figure 3 Along the length direction X, an end of the shell 10 adjacent to the first electrode assembly 20 is provided with an opening 12, and an end adjacent to the nth electrode assembly 20 is a closed end. Multiple electrode assemblies 20 are located in the shell 10, and an end cover 30 is provided at the opening 12. The positive terminal 41 can be provided on the end cover 30, and the positive terminal 41 is connected to the positive electrode tab 211 of the first electrode assembly 20. The negative electrode connecting portion 11 is the first surface 101 of the shell 10 adjacent to the nth electrode assembly 20, and the negative electrode tab 212 of the nth electrode assembly 20 is against the first surface 101, so that the shell 10 is negatively charged.

[0120] Of course, the positive terminal 41 may not be disposed on the end cover 30 , but may be disposed on the shell 10 and insulated from the shell 10 .

[0121] In some embodiments, the housing 10 includes two first surfaces 101 opposite to each other along the first direction X and second surfaces 102 adjacent to and connected to the first surfaces 101, respectively, and the positive terminal 41 and the negative electrode connection portion 11 are respectively located on the two first surfaces 101; or, referring to Figure 7 One of the positive electrode terminal 41 and the negative electrode connecting portion 11 is located on one of the two first surfaces 101 , and the other is located on the second surface 102 .

[0122] In some embodiments, reference Figure 8The interconnected positive electrode tabs 211 and the interconnected negative electrode tabs 212 of two adjacent electrode assemblies 20 both include a first weld print area 201 and a second weld print area 202 located in the first weld print area 201. The first weld print area 201 on the positive electrode tab 211 is used to weld multiple positive electrode tab sheets of the positive electrode tab 211, the first weld print area 201 on the negative electrode tab 212 is used to weld multiple negative electrode tab sheets of the negative electrode tab 212, the second weld print area 202 on the positive electrode tab 211 is used to weld the positive electrode tabs 211 of the two adjacent electrode assemblies 20, and the second weld print area 202 on the negative electrode tab 212 is used to weld the negative electrode tabs 212 of the two adjacent electrode assemblies 20.

[0123] The multiple positive electrode tab sheets of the positive electrode tab 211 and the multiple negative electrode tab sheets of the negative electrode tab 212 can be pre-welded (for example, ultrasonic welding) to form a first weld print area 201 on the positive electrode tab 211 and the negative electrode tab 212. Then, the interconnected positive electrode tabs 211 and the interconnected negative electrode tabs 212 are respectively final welded by ultrasonic welding or laser welding in their respective first weld print areas 201 to form a second weld print area 202.

[0124] The first weld mark area 201 is formed by pre-welding, and the second weld mark area 201 is formed by final welding in the first weld mark area 201, which can reduce or avoid the risk of poor welding of the tab and improve the connection reliability.

[0125] In some embodiments, a bracket 50 is disposed between two adjacent electrode assemblies 20 . The bracket 50 has a storage space for accommodating the positive electrode tab 211 and the negative electrode tab 212 . The bracket 50 is used to support the electrode assembly 20 .

[0126] In some embodiments, the bracket 50 may include a first bracket and a second bracket, the first bracket and the second bracket are detachably connected, and when the first bracket and the second bracket are connected, a storage space for accommodating the positive electrode tab 211 and the negative electrode tab 212 is formed between the first bracket and the second bracket.

[0127] 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 multiple batteries 1, which may be connected to form a battery module through a busbar component, and the multiple batteries 1 may be connected in series, in parallel, or in mixed connection.

[0128] The battery module 100 may further include a case in which the battery 1 is accommodated.

[0129] The battery module 100 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.

[0130] An embodiment of the present application further provides an electrical device, comprising the above-mentioned battery 1 or battery module for providing electrical energy.

[0131] 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.

[0132] 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: case; A battery cell group is arranged in the shell, the battery cell group includes 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 of the electrode assemblies includes a main body and a positive electrode tab and a negative electrode tab connected to the main body, and the positive electrode tab and the negative electrode tab are respectively arranged at two ends of two adjacent main bodies facing each other; The positive terminal is connected to the positive electrode tab and is insulated from the shell, and the negative electrode tab is conductively connected to at least a portion of the shell.

2. The battery according to claim 1, characterized in that The shell is a metal shell.

3. The battery according to claim 1 or 2, characterized in that: The housing includes a negative electrode connecting portion connected to the negative electrode tab. Along the first direction, all the positive electrode tabs and all the negative electrode tabs of the first electrode assembly are connected to the end of the first main body adjacent to the second electrode assembly; both ends of the main body of the electrode assemblies other than the first electrode assembly are provided with the positive electrode tabs and the negative electrode tabs, The positive terminal is connected to the positive electrode tab of the nth electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the negative electrode connecting portion; The positive terminal and the negative electrode connecting portion are both located on the same side of the shell along the first direction.

4. The battery according to claim 3, characterized in that The shell comprises a first surface and a second surface connected to each other, the first surface is located 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 surface; or one of the positive electrode terminal and the negative electrode connecting portion is located on the first surface, and the other is located on the second surface.

5. The battery according to claim 1 or 2, characterized in that: The housing includes a negative electrode connecting portion connected to the negative electrode tab. Along the first direction, the positive electrode tab of the first electrode assembly is connected to the end of the first main body away from the second electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the end of the nth main body away from the n-1th electrode assembly; The positive terminal is connected to the positive electrode tab of the first electrode assembly, and the negative electrode tab of the nth electrode assembly is connected to the negative electrode connecting portion; The positive terminal and the negative electrode connecting portion are respectively located on two opposite sides of the shell along the first direction.

6. The battery according to claim 5, characterized in that The housing includes two first surfaces opposite to each other along the first direction and second surfaces respectively adjacent to and connected to the first surfaces. The positive electrode terminal and the negative electrode connection portion are respectively located on the two first surfaces; or one of the positive electrode terminal and the negative electrode connection portion is located on one of the two first surfaces, and the other is located on the second surface.

7. The battery according to any one of claims 1 to 6, characterized in that Also includes: an end cover, arranged at the open end of the shell, The positive terminal is disposed on the housing.

8. The battery according to any one of claims 1 to 6, characterized in that Also includes: An end cover is arranged at the open end of the shell, and the positive terminal is arranged on the end cover.

9. The battery according to any one of claims 1 to 8, characterized in that Along the first direction, the positive electrode tabs of two adjacent electrode assemblies are connected to each other, and the negative electrode tabs of two adjacent electrode assemblies are connected to each other.

10. The battery according to claim 9, characterized in that The interconnected positive electrode tabs and the interconnected negative electrode tabs both include a first weld print area and a second weld print area located in the first weld print area, the first weld print area on the positive electrode tab is used to weld multiple positive electrode tab sheets of the positive electrode tab, the first weld print area on the negative electrode tab is used to weld multiple negative electrode tab sheets of the negative electrode tab, the second weld print area on the positive electrode tab is used to weld the positive electrode tabs of two adjacent electrode assemblies, and the second weld print area on the negative electrode tab is used to weld the negative electrode tabs of two adjacent electrode assemblies.

11. The battery according to claim 9, characterized in that The positive electrode tabs of two adjacent electrode assemblies are connected directly or through a transition piece. The negative electrode tabs of two adjacent electrode assemblies are connected directly or through a transition piece.

12. The battery according to any one of claims 1 to 11, characterized in that The main body is a winding structure or a laminated structure.

13. The battery according to any one of claims 1 to 12, characterized in that The shell is made of aluminum, copper, stainless steel, aluminum alloy or copper alloy.

14. The battery according to any one of claims 1 to 13, characterized in that 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 according to claim 14, characterized in that The size of the shell along the first direction is 400 mm to 1400 mm, the size of the shell along the second direction is 60 mm to 140 mm, and the size of the shell along the third direction is 15 mm to 35 mm.

16. A battery module, characterized in that: include: At least one battery according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 15 or the battery module according to claim 16 for providing electrical energy.

18. An energy storage device, characterized in that: The invention comprises the battery according to any one of claims 1 to 15 or the battery module according to claim 16, wherein the battery is capable of storing electric energy and providing electric energy.

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