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

Abstract

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and at least two electrode terminals, and the shell is provided with a first shell wall and an accommodating cavity; the electrode assembly is arranged in the accommodating cavity and is provided with at least two tabs, and the at least two tabs comprise a first tab and a second tab; the at least two electrode terminals comprise a first electrode terminal and a second electrode terminal which are arranged on the first shell wall, the first electrode terminal and the second electrode terminal are arranged in a spaced mode in the first direction, the first tab is directly connected with the first electrode terminal, and the second tab is directly connected with the second electrode terminal; each electrode terminal includes a first portion on an outer side of the housing, and along a first direction, a ratio of a distance between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal to a size of the first housing wall is not greater than 60%. The utility model has high volume energy density and high structural strength.

Description

Technical Field

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

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field, etc. In new energy vehicles equipped with batteries, the batteries can be used to provide power wholly or partly. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side.

[0003] The structural strength of the battery is related to the service life of the battery. Therefore, how to improve the structural strength of the battery is one of the topics that the industry needs to study to extend the battery life. In addition, the industry continuously puts forward higher requirements for the volume energy density of the battery. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery cell, a battery, an energy storage device and an electrical device with high volume energy density and high structural strength.

[0005] The present application is achieved by the following technical solutions.

[0006] A first aspect of the present application provides a battery cell, comprising: a housing having a first housing wall and a receiving cavity; an electrode assembly disposed in the receiving cavity and having at least two tab ears, at least two of the tab ears including a first tab ear and a second tab ear; at least two electrode terminals including a first electrode terminal and a second electrode terminal disposed on the first housing wall, the first electrode terminal and the second electrode terminal being spaced apart along a first direction, the first tab ear being directly connected to the first electrode terminal, the second tab ear being directly connected to the second electrode terminal, each of the electrode terminals including a first portion located outside the housing, and along the first direction, the ratio of the distance between the central axes of the first portions of the first electrode terminal and the second electrode terminal to the size of the first housing wall is not greater than 60%.

[0007] In the technical solution of the embodiment of the present application, since the first electrode terminal is directly connected to the first tab of the electrode assembly, and the second electrode terminal is directly connected to the second tab, the adapter plate connecting the electrode terminal and the tab is cancelled, saving the space occupied by the adapter plate, which is beneficial to reducing the distance between the first electrode terminal and the second electrode terminal. Moreover, the distance between the first electrode terminal and the second electrode terminal is set to be relatively small, making the first electrode terminal and the second electrode terminal arranged more compactly, which is beneficial to improving the structural strength of the first housing wall. Furthermore, the continuous space available on the inner and outer sides of the first housing wall is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell.

[0008] In some embodiments, each of the electrode terminals further includes an intermediate portion disposed in a terminal mounting hole of the first housing wall and a second portion located inside the outer housing, and the second portion is connected to the tab.

[0009] The intermediate portion is connected between the first portion and the second portion. The electrode terminal passes through the terminal mounting hole. The first portion of the electrode terminal located outside the first housing wall is used to connect to other battery cells through a busbar structure, and the second portion of the electrode terminal located inside the first housing wall is used to be directly connected to the tab, so that the electrode terminal can conduct or export current.

[0010] In some embodiments, in the same electrode terminal, the first portion and the second portion overlap in the thickness direction of the first housing wall.

[0011] The first portion of the first electrode terminal and the first portion of the second electrode terminal are close to each other. And in the thickness direction of the first housing wall, the first portion and the second portion of the first electrode terminal overlap, and the first portion and the second portion of the second electrode terminal overlap. In this way, the second portions of the first electrode terminal and the second electrode terminal are also relatively close to each other, making the continuous space available inside the first housing wall relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell. Moreover, the first portion and the second portion are respectively sandwiched between opposite sides of the first housing wall, which is beneficial to improving the structural strength of the first housing wall, and thus further improving the structural strength of the battery cell.

[0012] In some embodiments, in the same electrode terminal, a part of the first portion overlaps with the whole of the second portion in the thickness direction of the first housing wall.

[0013] In this way, the second parts of the first electrode terminal and the second electrode terminal are closer, which is beneficial to increasing the remaining continuous space between the first housing wall and the electrode assembly, thus facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell. Moreover, the first part and the second part are respectively sandwiched on opposite sides of the first housing wall, which is beneficial to improving the structural strength of the first housing wall, and further improving the structural strength of the battery cell.

[0014] In some embodiments, in the same electrode terminal, the second part includes a body part that coincides with the first part in the wall thickness direction of the first housing wall and an extension part that extends beyond the first part along the first direction. The extension part of the first electrode terminal is located on the side of the body part of the first electrode terminal facing the second electrode terminal, and the extension part of the second electrode terminal is located on the side of the body part of the second electrode terminal facing away from the first electrode terminal.

[0015] In this way, the second parts of the first electrode terminal and the second electrode terminal are arranged in the same direction, which is beneficial to reducing the distance between the first electrode terminal and the second electrode terminal, making the first electrode terminal and the second electrode terminal arranged more compactly, which is beneficial to improving the structural strength of the first housing wall. Moreover, the remaining continuous space on the inner and outer sides of the first housing wall is relatively large, thus facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell.

[0016] In some embodiments, among the first tab and the second tab, one is a positive tab and the other is a negative tab.

[0017] In this way, one of the first electrode terminal and the second electrode terminal is a positive terminal and the other is a negative terminal. Moreover, the battery cell has high structural strength and high volumetric energy density.

[0018] In some embodiments, both the first tab and the second tab are positive tabs, or both the first tab and the second tab are negative tabs.

[0019] In this way, the first electrode terminal and the second electrode terminal are terminals of the same polarity, both being positive terminals or both being negative terminals.

[0020] In some embodiments, the first tab and the second tab are formed as one body.

[0021] In this way, the first tab and the second tab are formed as one body, which is beneficial to the first electrode terminal and the second electrode terminal being closer, and is more beneficial to improving the structural strength of the first housing wall. Moreover, it makes the remaining continuous space on the inner and outer sides of the first housing wall larger, thus facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell.

[0022] In some embodiments, the first tab and the second tab are spaced apart.

[0023] In this way, the first tab and the second tab do not affect each other, facilitating the connection of the first electrode terminal and the second electrode terminal to the first tab and the second tab respectively, so that the first electrode terminal and the second electrode terminal do not affect each other.

[0024] In some embodiments, the minimum distance between the first tab and the second tab along the first direction is not less than 5 mm.

[0025] By setting the value range of the minimum distance between the first tab and the second tab along the first direction, the reliability of electrical insulation between the first tab and the second tab is improved, thereby reducing the probability of mutual influence between the first tab and the second tab, and further improving the performance of the battery cell.

[0026] In some embodiments, along the first direction, the distance between the central axes of the first parts of the first electrode terminal and the second electrode terminal is not greater than 100 mm.

[0027] By limiting the value range of the distance between the central axes of the first parts of the first electrode terminal and the second electrode terminal along the first direction, the first electrode terminal and the second electrode terminal are arranged more compactly, which is beneficial to improving the structural strength of the first housing wall. Moreover, the continuous space on the inner and outer sides of the first housing wall is relatively large, which is conducive to the arrangement of other components, and further conducive to improving the volume energy density of the battery cell.

[0028] In some embodiments, along the first direction, the minimum distance between the first parts of the first electrode terminal and the second electrode terminal is not less than 2 mm.

[0029] In this way, the minimum distance between the first parts of the first electrode terminal and the second electrode terminal along the first direction is limited to not less than 2 mm, improving the reliability of electrical insulation between the first electrode terminal and the second electrode terminal, thereby reducing the probability of mutual influence between the first electrode terminal and the second electrode terminal, and further improving the performance of the battery cell.

[0030] In some embodiments, the first electrode terminal is welded to the first tab, and the second electrode terminal is welded to the second tab.

[0031] By connecting in a welding manner, the welding operation is simple and the connection reliability is high.

[0032] In some embodiments, the end face of one end of the first part of each electrode terminal away from the middle part is the first end face, the end face of one end of the second part away from the middle part is the second end face, and the area of the second end face is smaller than the area of the first end face.

[0033] The first end face is the outer end face of the electrode terminal and is used for welding with the busbar structure. The second end face is the inner end face of the electrode terminal and is used for welding with the tab. Since during the battery module formation process, welding through the first end face with the busbar structure is required to ensure current conduction, a larger weld mark area needs to be ensured, so the area of the first end face needs to be set relatively large, while a smaller area of the second end face can also ensure the weld mark area with the tab.

[0034] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 20% to 150%.

[0035] Thus, by limiting the ratio of the size of the second end face to the size of the first end face along the first direction in the range of 20% to 150%, it is beneficial to make the weld mark areas at the first end face and the second end face reach their respective standards, thereby improving the charge and discharge efficiency of the battery cell.

[0036] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 25% to 100%.

[0037] Since during the battery module formation process, welding through the first end face with another battery cell is required to ensure current conduction, a larger weld mark area needs to be ensured, so the area of the first end face needs to be set relatively large, while a smaller area of the second end face can also ensure the weld mark area with the tab. Therefore, by limiting the ratio of the size of the second end face to the size of the first end face along the first direction in the range of 25% to 100%, it is beneficial for the area of the first end face to be larger than the area of the second end face, so that the weld mark areas at the two ends of the electrode terminal meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell.

[0038] In some embodiments, along the first direction, the size of the first end face is in the range of 20 mm to 50 mm, and / or the size of the second end face is in the range of 10 mm to 30 mm.

[0039] Thus, by respectively limiting the sizes of the first end face and the second end face, it is more beneficial for the weld mark areas at the two ends of the electrode terminal to meet their respective current conduction standards, thereby improving the charge and discharge efficiency of the battery cell.

[0040] In some embodiments, along the first direction, the size of the first end face is in the range of 25 mm to 40 mm, and / or the size of the second end face is in the range of 10 mm to 25 mm.

[0041] Thus, by further restricting the value ranges of the sizes of the first end face and the second end face, it is more conducive to making the weld mark areas at the two connection points of the electrode terminal meet their respective over-current standards, thereby improving the charge and discharge efficiency of the battery cell.

[0042] In some embodiments, along the first direction, the center of the second end face is offset from the center of the tab connected to the second end face.

[0043] By making the center of the second end face offset from the center of the tab connected to the second end face along the first direction, it is beneficial to increase the continuous space on the side opposite to the offset direction, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell.

[0044] In some embodiments, along the first direction, the distance between the center of the second end face and the center of the tab connected to the second end face is not greater than 20 mm.

[0045] By limiting the distance between the center of the second end face and the center of the tab connected to the second end face within a range not greater than 20 mm, it is beneficial to form a weld mark with sufficient area between the second end face and the tab, and is also beneficial to increasing the continuous space and improving the volumetric energy density of the battery cell.

[0046] In some embodiments, along the first direction, the distance between the center of the second end face and the center of the tab connected to the second end face is 1 mm.

[0047] Thus, by setting the distance between the center of the second end face and the center of the tab connected to the second end face to 1 mm, it is more conducive to forming a weld mark with sufficient area between the second end face and the tab, and is also beneficial to increasing the continuous space and improving the volumetric energy density of the battery cell.

[0048] In some embodiments, the size of the surface of the tab facing the first housing wall along the first direction is in the range of 25 mm to 65 mm.

[0049] Thus, by limiting the size of the surface of the tab facing the first housing wall along the first direction within the range of 25 mm to 65 mm, it is beneficial to make the weld mark area between the tab and the electrode terminal within a suitable range and does not occupy too much space, thereby being beneficial to increasing the continuous space and improving the volumetric energy density of the battery cell.

[0050] In some embodiments, the dimension of the surface of the tab facing the first housing wall along the first direction is in the range of 30 mm to 50 mm.

[0051] Thus, by limiting the dimension of the surface of the tab facing the first housing wall along the first direction within the range of 30 mm to 50 mm, it is more conducive to making the welding area of the tab and the electrode terminal within a suitable range, and will not occupy too much space, thereby facilitating the increase of the continuous space and improving the volumetric energy density of the battery cell.

[0052] In some embodiments, along the first direction, the midpoint between the central axis of the first part of the first electrode terminal and the central axis of the first part of the second electrode terminal is offset from the center of the first housing wall.

[0053] Thus, the continuous space on the side of the first housing wall opposite to the deviation direction of the first electrode terminal and the second electrode terminal is larger, which is conducive to the arrangement of other components and more conducive to improving the volumetric energy density of the battery cell.

[0054] In some embodiments, along the first direction, the ratio of the distance between the midpoint between the central axis of the first part of the first electrode terminal and the central axis of the first part of the second electrode terminal and the center of the first housing wall to the dimension of the first housing wall is not greater than 47.5%.

[0055] Thus, by limiting the ratio of the distance between the midpoint between the central axis of the first part of the first electrode terminal and the central axis of the first part of the second electrode terminal and the center of the first housing wall to the dimension of the first housing wall within the range not greater than 47.5%, it enables the end of the first housing wall opposite to the deviation direction to have sufficient space to install the first electrode terminal and the second electrode terminal, and also makes the continuous space on the side of the first housing wall opposite to the deviation direction of the first electrode terminal and the second electrode terminal larger, which is conducive to the arrangement of other components and more conducive to improving the volumetric energy density of the battery cell.

[0056] In some embodiments, along the first direction, the ratio of the distance between the midpoint between the central axis of the first part of the first electrode terminal and the central axis of the first part of the second electrode terminal and the center of the first housing wall to the dimension of the first housing wall is in the range of 40% to 47.5%.

[0057] Thus, along the first direction, the ratio of the distance between the midpoint of the central axis of the first part of the first electrode terminal and the central axis of the first part of the second electrode terminal to the size of the first housing wall is limited within the range of 40% to 47.5%, so that one end of the first housing wall opposite to the deviation direction is sufficient to mount the first electrode terminal and the second electrode terminal, and the continuous space of the first housing wall on the side opposite to the deviation direction of the first electrode terminal and the second electrode terminal can be made larger, which is beneficial to the layout of other components and more beneficial to improving the volumetric energy density of the battery cell.

[0058] The second aspect of the present application provides a battery, including: at least one of the above-mentioned battery cells.

[0059] Since the battery includes battery cells, the battery has all the beneficial effects of the battery cells. Therefore, the battery has high structural strength and high volumetric energy density.

[0060] The third aspect of the present application provides an energy storage device, including: at least one of the above-mentioned battery cells or the above-mentioned battery.

[0061] Since the energy storage device includes battery cells or a battery, the energy storage device has all the beneficial effects of the battery cells or the battery. Therefore, the energy storage device has high structural strength and is beneficial to reducing the accommodation space of the energy storage device for accommodating battery cells or a battery, or the energy storage device can accommodate battery cells or a battery with a larger capacity in a limited accommodation space.

[0062] The fourth aspect of the present application provides an electrical device, and the electrical device includes the above-mentioned battery cell or the above-mentioned battery for providing electric energy.

[0063] Since the electrical device includes battery cells or a battery, the electrical device has all the beneficial effects of the battery cells or the battery. Therefore, the electrical device has high structural strength and is beneficial to reducing the accommodation space of the electrical device for accommodating battery cells or a battery, or the electrical device can accommodate battery cells or a battery with a larger capacity in a limited accommodation space.

[0064] Utility Model Effects

[0065] Through the present application, it is possible to provide a battery cell, a battery, an energy storage device and an electrical device with high volumetric energy density and high structural strength. Brief Description of the Drawings

[0066] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0067] Figure 1 Schematic structural diagram of a vehicle provided for some embodiments of the present application;

[0068] Figure 2 Exploded perspective view of a battery provided for some embodiments of the present application;

[0069] Figure 3 Exploded perspective view of a battery cell provided for some embodiments of the present application;

[0070] Figure 4 Top view of a battery cell provided for some embodiments of the present application;

[0071] Figure 5 is Figure 4 Cross-sectional view taken along line A-A in

[0072] Figure 6 is Figure 5 Enlarged view of A in

[0073] Figure 7 Exploded perspective view of a battery cell provided for some embodiments of the present application;

[0074] Figure 8 Partial cross-sectional view of another structure of a battery cell provided for some embodiments of the present application;

[0075] Figure 9 Top view of yet another structure of a battery cell provided for some embodiments of the present application;

[0076] Figure 10 Partial cross-sectional view of a battery cell in the prior art.

[0077] Explanation of reference numerals

[0078] 1000 Vehicle; 100 Battery; 10 Battery box; 101 Box cover; 102 Box body; 200 Controller; 300 Motor; 20 Battery cell; 1 Outer shell; 11 First shell wall; 111 Terminal mounting hole; 2 Electrode assembly; 21 First tab; 22 Second tab; 3a First electrode terminal; 3b Second electrode terminal; 31 First part; 3111 First end face; 32 Intermediate part; 33 Second part; 3311 Body part; 3312 Extension part; 3313 Second end face; 311 Terminal plate; 3110 Through hole; 312 Terminal disk; 313 Connecting column; 4 Insulating structure; 5 Insulating part; 6 Adapter plate. Detailed implementation manners

[0079] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0081] In the description of the embodiments of this application, technical terms such as "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 quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0082] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0083] In the description of the embodiments of this application, the term "and / or" is only a relationship describing the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0084] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and thus cannot be understood as a limitation on the embodiments of this application.

[0085] 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.

[0086] 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.

[0087] Below, this application is described in detail.

[0088] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0089] In the embodiment of the present application, the battery includes a battery cell.

[0090] The inventors of the present application have noticed that, currently, the end cap of a battery cell is provided with at least two electrode terminals, and the electrode terminals are connected to the pole ears of the electrode assembly through adapter sheets. The electrode terminals are distributed relatively dispersedly, and the spacing between the electrode terminals is relatively large, which makes the structural strength of the end cap relatively low, and also makes the free continuous space of the end cap relatively small, which is not conducive to the arrangement of other components and easily affects the volume energy density of the battery cell.

[0091] The inventors of the present application have discovered through research that eliminating the adapter plate that connects the electrode terminal and the electrode lug of the electrode assembly can reduce the space occupied by the adapter plate, which is beneficial for the electrode terminals to be arranged close to each other, and the spacing between the electrode terminals can be limited to a relatively small value, so that the electrode terminals are arranged more concentratedly, which is beneficial for improving the structural strength of the end cover. Moreover, the free continuous space on the inner and outer sides of the end cover is relatively large, which is beneficial for the arrangement of other components, and further beneficial for improving the volume energy density of the battery cell.

[0092] Based on such a design concept, the inventors of the present application have designed a battery cell. The battery cell includes a housing, an electrode assembly, and at least two electrode terminals. The housing has a first housing wall and a receiving cavity; the electrode assembly is disposed in the receiving cavity and has at least two tab ears, and the at least two tab ears include a first tab ear and a second tab ear; the at least two electrode terminals include a first electrode terminal and a second electrode terminal disposed on the first housing wall. The first electrode terminal and the second electrode terminal are spaced apart along a first direction. The first tab ear is directly connected to the first electrode terminal, and the second tab ear is directly connected to the second electrode terminal. Each electrode terminal includes a first portion located outside the housing. Along the first direction, the ratio of the distance between the central axes of the first portions of the first electrode terminal and the second electrode terminal to the size of the first housing wall is not greater than 60%.

[0093] The electrode terminals of the present application are directly connected to the tab ears, eliminating the adapter plate, which is beneficial to reducing the distance between the electrode terminals. Moreover, the distance between the electrode terminals is set to be relatively small, making the arrangement of the electrode terminals relatively concentrated, which is beneficial to improving the structural strength of the first housing wall. In addition, the continuous space available inside and outside the first housing wall is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volume energy density of the battery cell.

[0094] The battery cell provided in the embodiments of the present application can be used in, but is not limited to, electrical devices or energy storage devices. The electrical device can be, but is not limited to, vehicles, ships, or aircraft, etc. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage device can be, but is not limited to, energy storage containers, energy storage cabinets, etc.

[0095] The present application also provides a battery. The battery can include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0096] In the embodiments of the present application, "multiple" means two or more.

[0097] In some embodiments of the present application, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0098] In some embodiments of the present application, the battery can be a battery pack. The battery pack includes a battery box and battery cells, and the battery cells or battery modules are accommodated in the battery box.

[0099] In some embodiments of the present application, the battery box can be part of the chassis structure of a vehicle. For example, part of the battery box can form at least part of the floor of the vehicle, or part of the battery box can form at least part of the cross beams and longitudinal beams of the vehicle.

[0100] The battery provided by the embodiments of the present application can be but is not limited to being used in electrical devices or energy storage devices. The electrical devices can be but are not limited to vehicles, ships, or aircraft, etc. For example, mobile phones, portable devices, laptops, battery-powered vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage device can be but is not limited to an energy storage container, an energy storage electrical cabinet, etc.

[0101] The embodiments of the present application also provide an energy storage device. The energy storage device includes battery cells or batteries.

[0102] The energy storage device provided by the embodiments of the present application can be but is not limited to an energy storage container, an energy storage electrical cabinet, etc.

[0103] The embodiments of the present application also provide an electrical device. The electrical device includes battery cells or batteries for providing electrical energy.

[0104] The electrical device provided by the embodiments of the present application can be but is not limited to mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys. For example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

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

[0106] Figure 1 It is a schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application.

[0107] The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 1 shown, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0108] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also 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.

[0109] Figure 2 It is a three-dimensional exploded view of the battery 100 provided by the embodiments of the present application.

[0110] As Figure 2 shown, the battery 100 includes a battery box 10 and at least one battery cell 20. An accommodation space is provided in the battery box 10, and at least one battery cell 20 is accommodated in the accommodation space.

[0111] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101. The box cover 101 covers the upper part of the box body 102, so as to form the accommodation space between the box body 102 and the box cover 101.

[0112] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-like structure. The box cover 101 is covered on the opening side of the box body 102, so that the box cover 101 and the box body 102 jointly define the accommodation space; the box cover 101 and the box body 102 can also both be hollow structures with one side open, and the opening side of the box cover 101 is covered on the opening side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0113] In the battery 100, there can be multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the box body 102 and the box cover 101; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the accommodation space formed by the box body 102 and the box cover 101. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0114] In the embodiments of the present application, the battery cell 20 can be a secondary battery, which refers to a battery cell that can activate the active material through charging after discharging and can continue to be used.

[0115] The battery cell 20 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0116] The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present application has no special limitation.

[0117] Next, with reference to Figures 3 to 10 Some embodiments of the present application will be described in detail.

[0118] Figure 3 A schematic three-dimensional structure diagram of the battery cell provided by some embodiments of the present application; Figure 4 A top view of the battery cell provided by some embodiments of the present application; Figure 5 For Figure 4 The cross-sectional view at A-A in

[0119] Figure 6 For Figure 5 The enlarged view at A in Figure 7 A schematic exploded three-dimensional structure diagram of the battery cell provided by some embodiments of the present application; Figure 8 A partial cross-sectional view of another structure of the battery cell provided by some embodiments of the present application; Figure 9 A top view of yet another structure of the battery cell provided by some embodiments of the present application; Figure 10 A partial cross-sectional view of a battery cell in the prior art.

[0120] In the description of the embodiments of the present application, for the convenience of description, the direction of the arrow X is used to represent the length direction of the first housing wall; the direction of the arrow Y is used to represent the width direction of the first housing wall; the direction of the arrow Z is used to represent the wall thickness direction of the first housing wall.

[0121] The first aspect of the present application provides a battery cell 20, as Figures 3 to 6As shown, the battery cell 20 includes a housing 1, an electrode assembly 2, and at least two electrode terminals. The housing 1 has a first housing wall 11 and a receiving cavity; the electrode assembly 2 is disposed in the receiving cavity, and the electrode assembly 2 has at least two tabs, and the at least two tabs include a first tab 21 and a second tab 22; the at least two electrode terminals include a first electrode terminal 3a and a second electrode terminal 3b disposed on the first housing wall 11, the first electrode terminal 3a and the second electrode terminal 3b are spaced apart along a first direction, the first tab 21 is directly connected to the first electrode terminal 3a, and the second tab 22 is directly connected to the second electrode terminal 3b. Each electrode terminal includes a first portion 31 located outside the housing 1. Along the first direction, the ratio of the distance between the central axes of the first portions 31 of the first electrode terminal 3a and the second electrode terminal 3b to the size of the first housing wall 11 is not greater than 60%.

[0122] The electrode assembly 2 is a component in the battery cell 20 where an electrochemical reaction occurs. One or more electrode assemblies 2 may be included in the housing 1. The electrode assembly 2 includes a positive electrode plate, a negative electrode plate, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode plate and the negative electrode plate, which can prevent short circuit between the positive and negative electrodes and at the same time allow active ions to pass through. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 2, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the positive electrode tab and the negative electrode tab. The positive electrode tab and the negative electrode tab may be commonly located at one end of the main body or respectively located at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode terminals are directly connected to the tabs.

[0123] As Figure 3 shown, the housing 1 has a plurality of housing walls. For convenience of description, one of the housing walls is named the first housing wall 11. The electrode assembly 2 is located in the receiving cavity surrounded by the plurality of housing walls.

[0124] In some embodiments, the housing 1 is used to encapsulate components such as the electrode assembly 2 and the electrolyte. The housing 1 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc.

[0125] In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, the outer casing 1 serves to protect the electrode assembly, and a sealed bag is further included between the outer casing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film. As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery. The multi-prismatic battery is, for example, a hexagonal prism battery, etc. In Figures 3 to 9 the illustrated embodiment, for ease of explanation, a square-shell battery cell is taken as an example for illustration.

[0126] In some embodiments, as Figures 3 to 5 shown, the outer casing 1 includes a plurality of casing walls, and a part of the casing walls enclose a space with an opening, and the opening can be closed by other casing walls (such as the first casing wall 11) to form a receiving cavity for receiving substances such as the electrode assembly 2 and the electrolyte. The outer casing 1 can be provided with one or more openings. The casing wall (such as the first casing wall 11) closing the opening can also be configured as a top cover.

[0127] As Figures 5 to 9 shown, for ease of explanation, in the embodiments of the present application, the casing wall where the electrode terminal is located is referred to as the first casing wall 11. The electrode terminal is provided on the first casing wall 11, and the electrode terminal conducts the current in the electrode assembly 2 by connecting with the tab of the electrode assembly 2.

[0128] Optionally, the number of electrode terminals can be two, three, four, etc. The electrode terminal can be located at the central position of the first casing wall 11, or can be located at a position on the first casing wall 11 that is deviated from the central position towards one end of the first casing wall 11.

[0129] The dimension of the first casing wall 11 along its length direction X is greater than the dimension along the width direction Y. The first direction in which the first electrode terminal 3a and the second electrode terminal 3b are spaced apart can be consistent with the length direction X of the first casing wall 11, can also be consistent with the width direction of the first casing wall 11, or can also intersect both the length direction X and the width direction Y of the first casing wall 11. In addition, the arrangement of the first electrode terminal 3a and the second electrode terminal 3b can be an arrangement that is aligned with each other along the first direction, that is, the projections along the first direction completely overlap; or can be an arrangement that is arranged along the first direction and is misaligned with each other along the direction perpendicular to the first direction, that is, the projections along the first direction partially overlap or do not overlap. In the present application, as a specific example, an arrangement mode that is aligned with each other along the first direction is taken as an example for explanation, and for ease of description, the present application takes the first direction as being consistent with the length direction X of the first casing wall 11 as an example for description.

[0130] The first part 31 is the part of the electrode terminal that extends beyond the outer surface of the first housing wall 11 towards the outside of the housing 1. As Figure 4 shown, the ratio of the distance L1 along the first direction between the central axes of the first parts 31 of the first electrode terminal 3a and the second electrode terminal 3b to the dimension L2 of the first housing wall 11 is not greater than 60%, so that the first electrode terminal 3a and the second electrode terminal 3b are arranged relatively compactly.

[0131] Exemplarily, the ratio of the distance L1 along the first direction between the central axes of the first parts 31 of the first electrode terminal 3a and the second electrode terminal 3b to the dimension L2 of the first housing wall 11 can be, but is not limited to, 0.5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60%.

[0132] In the battery cell 20 provided by the embodiment of the present application, the first electrode terminal 3a is directly connected to the first tab 21 of the electrode assembly 2, and the second electrode terminal 3b is directly connected to the second tab 22. The connecting adapter between the electrode terminal and the tab is cancelled, and the space occupied by the adapter is saved, which is beneficial to reducing the distance between the first electrode terminal 3a and the second electrode terminal 3b. Moreover, the distance between the first electrode terminal 3a and the second electrode terminal 3b is set to be relatively small, so that the first electrode terminal 3a and the second electrode terminal 3b are arranged relatively compactly, which is beneficial to improving the structural strength of the first housing wall 11. Furthermore, the continuous space on the inner and outer sides of the first housing wall 11 is relatively large, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell 20.

[0133] In some embodiments of the present application, as Figure 6 and Figure 7 shown, each electrode terminal further includes an intermediate part 32 disposed in the terminal mounting hole 111 of the first housing wall 11 and a second part 33 located inside the housing 1, and the second part 33 is directly connected to the tab.

[0134] The intermediate part 32 is connected between the first part 31 and the second part 33. The electrode terminal passes through the terminal mounting hole 111. The first part 31 of the electrode terminal located outside the first housing wall 11 is used to connect to other battery cells through a busbar structure, and the second part 33 of the electrode terminal located inside the first housing wall 11 is used to be directly connected to the tab, so that the electrode terminal can conduct current in or out.

[0135] In some embodiments of the present application, as Figure 7As shown, each electrode terminal includes a terminal plate 312, a terminal board 311 and a connecting column 313. The terminal plate 312 is located on the inner side of the first housing wall 11, and the terminal board 311 is located on the outer side of the first housing wall 11. One end of the connecting column 313 is connected to the terminal plate 312 and formed as a whole. The connecting column 313 passes through the terminal mounting hole 111. The terminal board 311 is formed with a through hole 3110. The end of the connecting column 313 away from the terminal plate 312 is riveted to the terminal board 311 through the through hole 3110. The terminal plate 312 is the portion of the electrode terminal that exceeds the inner surface of the first housing wall 11, that is, Figure 7 The terminal plate 312 in the Figure 6 The second part 33, Figure 7 The portion of the connecting column 313 located in the terminal mounting hole 111 is Figure 6 The middle portion 32, Figure 7 The portion of the connecting column 313 that penetrates into the through hole 3110 of the terminal plate 311 and the terminal plate 311 are both located outside the first housing wall 11, that is, Figure 7 The structure formed by the portion of the connecting column 313 that penetrates into the through hole 3110 of the terminal plate 311 and the terminal plate 311 is Figure 6 The first part 31.

[0136] The terminal plate 311 is used to electrically connect to the bus structure, and the bus structure can realize the electrical connection between the battery cells 20. The terminal plate 311 can be made of metal, such as copper, aluminum, etc. Optionally, the terminal plate 311 is configured to be generally flat. The shape of the flat plate can be designed according to the situation, for example, it can be round, Figure 7 The square shown.

[0137] The electrode terminal can improve heat dissipation by designing the terminal plate 311 to be larger, thereby improving the support for the first housing wall 11 and the connection strength with the busbar structure.

[0138] The terminal plate 312 may be made of metal, such as copper, aluminum, etc. Optionally, the terminal plate 312 is substantially flat. The shape of the flat plate may be designed according to the situation, such as round, Figure 7 Square etc. shown.

[0139] Since the electrode terminal includes the terminal plate 312 located in the first housing wall 11, the electrode terminal can be easily connected to the electrode lug of the electrode assembly 2 through the terminal plate 312. The terminal plate 311 and the terminal plate 312 each have a high degree of freedom in shape design. Moreover, the terminal plate 311 and the terminal plate 312 clamp the first housing wall 11 from both the inner and outer sides of the housing 1, respectively, which can improve the bending strength of the first housing wall 11.

[0140] like Figure 7As shown, the terminal board 311 and the terminal plate 312 are connected by the connecting posts 313. There are no restrictions on the shape, size or quantity of the connecting posts 313, as long as the connection between the terminal board 311 and the terminal plate 312 can be achieved. In a specific embodiment, the connecting posts 313 are cylindrical.

[0141] In some embodiments, as Figure 7 shown, an insulating structure 4 is provided between the terminal board 311 and the first housing wall 11.

[0142] The insulating structure 4 and the terminal board 311 are fixed to each other, and the fixing method can be integral injection molding, bonding, fastening the two together through connecting posts, etc.

[0143] In some embodiments, an insulating member 5 can also be provided inside the first housing wall 11. The insulating member 5 can be used to isolate the electrical connection components in the housing 1 from the first housing wall 11 to reduce the risk of short circuit. Exemplarily, the insulating member 5 can be plastic, rubber, etc.

[0144] In some embodiments of the present application, in the same electrode terminal, the first part 31 and the second part 33 overlap in the wall thickness direction Z of the first housing wall 11.

[0145] The first part 31 of the first electrode terminal 3a and the first part 31 of the second electrode terminal 3b are close to each other, and in the wall thickness direction Z of the first housing wall 11, the first part 31 of the first electrode terminal 3a and the second part 33 overlap, and the first part 31 of the second electrode terminal 3b and the second part 33 overlap. In this way, the second part 33 of the first electrode terminal 3a and the second part 33 of the second electrode terminal 3b are also relatively close, so that the continuous free space inside the first housing wall 11 is relatively large, which is beneficial to the arrangement of other components, and thus beneficial to improving the volume energy density of the battery cell 20. Moreover, the first part 31 and the second part 33 are respectively sandwiched on opposite sides of the first housing wall 11, which is beneficial to improving the structural strength of the first housing wall 11, and thus further improving the structural strength of the battery cell 20.

[0146] In some embodiments of the present application, as Figure 6 shown, in the same electrode terminal, a part of the first part 31 overlaps with the whole of the second part 33 in the wall thickness direction Z of the first housing wall 11.

[0147] A part of the first part 31 overlaps with the whole of the second part 33 in the wall thickness direction Z of the first housing wall 11, that is, in the projection plane perpendicular to the wall thickness direction Z, the positive projection of the second part 33 completely falls within the positive projection range of the first part 31.

[0148] In this way, the second parts 33 of the first electrode terminal 3a and the second electrode terminal 3b are closer to each other, which is beneficial to increasing the remaining continuous space between the first housing wall 11 and the electrode assembly 2, thereby facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell 20. Moreover, the first part 31 and the second part 33 are respectively sandwiched on opposite sides of the first housing wall 11, which is beneficial to improving the structural strength of the first housing wall 11 and thus further improving the structural strength of the battery cell 20.

[0149] In some embodiments of the present application, as Figure 8 shown, in the same electrode terminal, the second part 33 includes a body part 3311 that coincides with the first part 31 in the wall thickness direction Z of the first housing wall 11 and an extension part 3312 that extends beyond the first part 31 in the first direction. The extension part 3312 of the first electrode terminal 3a is located on the side of the body part 3311 of the first electrode terminal 3a facing the second electrode terminal 3b, and the extension part 3312 of the second electrode terminal 3b is located on the side of the body part 3311 of the second electrode terminal 3b facing away from the first electrode terminal 3a.

[0150] In this way, the second parts 33 of the first electrode terminal 3a and the second electrode terminal 3b are arranged in the same direction, which is beneficial to reducing the distance between the first electrode terminal 3a and the second electrode terminal 3b, making the first electrode terminal 3a and the second electrode terminal 3b arranged more compactly, which is beneficial to improving the structural strength of the first housing wall 11. Moreover, the remaining continuous space on the inner and outer sides of the first housing wall 11 is relatively large, thereby facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell 20.

[0151] In some embodiments of the present application, among the first tab 21 and the second tab 22, one is a positive tab and the other is a negative tab.

[0152] In this way, one of the first electrode terminal 3a and the second electrode terminal 3b is a positive terminal and the other is a negative terminal. Moreover, the battery cell 20 has high structural strength and high volumetric energy density.

[0153] In some embodiments of the present application, both the first tab 21 and the second tab 22 are positive tabs, or both the first tab 21 and the second tab 22 are negative tabs.

[0154] In this way, the first electrode terminal 3a and the second electrode terminal 3b are terminals of the same polarity, both being positive terminals or both being negative terminals.

[0155] In some embodiments of the present application, both the first tab 21 and the second tab 22 are positive tabs, or both the first tab 21 and the second tab 22 are negative tabs, and the first tab 21 and the second tab 22 are formed integrally.

[0156] In this way, the first tab 21 and the second tab 22 are formed integrally, which is beneficial for the first electrode terminal 3a and the second electrode terminal 3b to be closer to each other, and is more conducive to improving the structural strength of the first housing wall 11. Moreover, the continuous space available inside and outside the first housing wall 11 is larger, which is conducive to the arrangement of other components, and thus conducive to improving the volumetric energy density of the battery cell 20.

[0157] In some embodiments of the present application, the first tab 21 and the second tab 22 are arranged at intervals.

[0158] Exemplarily, among the first tab 21 and the second tab 22, one is a positive tab and the other is a negative tab, and the first tab 21 and the second tab 22 are arranged at intervals.

[0159] Exemplarily, both the first tab 21 and the second tab 22 are positive tabs, or both the first tab 21 and the second tab 22 are negative tabs, and the first tab 21 and the second tab 22 are arranged at intervals.

[0160] In this way, the first tab 21 and the second tab 22 do not affect each other, which is convenient for the first electrode terminal 3a and the second electrode terminal 3b to be connected to the first tab 21 and the second tab 22 respectively, and the first electrode terminal 3a and the second electrode terminal 3b do not affect each other.

[0161] In some embodiments of the present application, as Figure 6 shown, the minimum distance L3 between the first tab 21 and the second tab 22 in the first direction is not less than 5 mm.

[0162] Exemplarily, the minimum distance L3 between the first tab 21 and the second tab 22 in the first direction can be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0163] By setting the value range of the minimum distance L3 between the first tab 21 and the second tab 22 in the first direction, the reliability of the electrical insulation between the first tab 21 and the second tab 22 is improved, thereby reducing the probability of mutual influence between the first tab 21 and the second tab 22, and further improving the performance of the battery cell 20.

[0164] In some embodiments of the present application, as Figure 4As shown, along the first direction, the distance L1 between the central axes of the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b is not greater than 100 mm.

[0165] Exemplarily, along the first direction, the distance L1 between the central axes of the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b can be, but is not limited to, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm.

[0166] By defining the value range of the distance L1 between the central axes of the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b along the first direction, the first electrode terminal 3a and the second electrode terminal 3b are arranged relatively compactly, which is beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous free space inside and outside the first housing wall 11 is relatively large, which is conducive to the arrangement of other components, and thus is conducive to improving the volume energy density of the battery cell 20.

[0167] In some embodiments of the present application, as Figure 6 shown, along the first direction, the minimum distance L4 between the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b is not less than 2 mm.

[0168] The minimum distance L4 between the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b along the first direction being not less than 2 mm means that the distance between the edge of the end of the first portion 31 of the first electrode terminal 3a close to the second electrode terminal 3b and the edge of the end of the first portion 31 of the second electrode terminal 3b close to the first electrode terminal 3a is not less than 2 mm.

[0169] Exemplarily, the minimum distance L4 between the first portions 31 of the first electrode terminal 3a and the first portions 31 of the second electrode terminal 3b along the first direction can be, but is not limited to, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm or 4 mm.

[0170] Thus, the minimum distance L4 between the first part 31 of the first electrode terminal 3a and the first part 31 of the second electrode terminal 3b along the first direction is defined within a range not less than 2 mm, improving the reliability of electrical insulation between the first electrode terminal 3a and the second electrode terminal 3b, thereby reducing the probability of mutual influence between the first electrode terminal 3a and the second electrode terminal 3b, and further improving the performance of the battery cell 20.

[0171] In some embodiments of the present application, the first electrode terminal 3a is welded to the first tab 21, and the second electrode terminal 3b is welded to the second tab 22.

[0172] Connected by welding, the welding operation is simple and the connection reliability is high.

[0173] In some embodiments of the present application, the end face of the end of the first part 31 of each electrode terminal away from the middle part 32 is the first end face 3111, and the end face of the end of the second part 33 away from the middle part 32 is the second end face 3313. The area of the second end face 3313 is smaller than the area of the first end face 3111.

[0174] Specifically, Figure 7 The structure formed by the part of the connecting column 313 in that penetrates into the through hole 3110 of the terminal plate 311 and the terminal plate 311 is the Figure 6 first part 31 in , that is, Figure 7 The outer end face of the connecting column 313 in and the surface of the terminal plate 311 facing away from the accommodating cavity form Figure 6 the first end face 3111 in . The area of the first end face 3111 is the area of the region surrounded by the outer edge of the surface of the terminal plate 311 facing away from the accommodating cavity. The second end face 3313 is the Figure 6 end face of the end of the second part 33 in away from the middle part 32, and is also the Figure 7 surface of the terminal disk 312 in facing away from the connecting column 313.

[0175] The first end face 3111 is the outer end face of the electrode terminal and is used for welding with the bus bar structure. The second end face 3313 is the inner end face of the electrode terminal and is used for welding with the tab. Since the battery cell 20 needs to be welded with the bus bar structure through the first end face 3111 to ensure current conduction during the grouping process, a larger welding mark area needs to be ensured, so the area of the first end face 3111 needs to be set relatively large, while a smaller area of the second end face 3313 can also ensure the welding mark area with the tab.

[0176] In some embodiments of the present application, as Figure 6 shown, along the first direction, the ratio of the dimension L5 of the second end face 3313 to the dimension L6 of the first end face 3111 is in the range of 20% to 150%.

[0177] It is understandable that the second end face 3313 and the first end face 3111 of the first electrode terminal 3a satisfy the above size conditions, that is, along the first direction, the ratio of the size L5 of the second end face 3313 of the first electrode terminal 3a to the size L6 of the first end face 3111 of the first electrode terminal 3a is in the range of 20% to 150%. The second end face 3313 and the first end face 3111 of the second electrode terminal 3b satisfy the above size conditions, that is, along the first direction, the ratio of the size L5 of the second end face 3313 of the second electrode terminal 3b to the size L6 of the first end face 3111 of the second electrode terminal 3b is in the range of 20% to 150%.

[0178] Exemplarily, along the first direction, the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 may be, but is not limited to, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140% or 150%.

[0179] In this way, by limiting the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 along the first direction to the range of 20% to 150%, it is beneficial to make the solder print areas at the first end face 3111 and the second end face 3313 reach their respective standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0180] In some embodiments of the present application, as Figure 6 shown, along the first direction, the size L6 of the first end face 3111 is greater than the size L5 of the second end face 3313.

[0181] It is understandable that the second end face 3313 and the first end face 3111 of the first electrode terminal 3a satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the first electrode terminal 3a is greater than the size L5 of the second end face 3313 of the first electrode terminal 3a. The second end face 3313 and the first end face 3111 of the second electrode terminal 3b satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the second electrode terminal 3b is greater than the size L5 of the second end face 3313 of the second electrode terminal 3b.

[0182] In this way, it is beneficial for the area of the first end face 3111 to be greater than the area of the second end face 3313, so that the solder print areas at the two ends of the electrode terminal meet their respective overcurrent standards respectively.

[0183] In some embodiments of the present application, along the first direction, the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 is in the range of 25% to 100%.

[0184] It can be understood that the second end face 3313 and the first end face 3111 of the first electrode terminal 3a satisfy the above size conditions, that is, along the first direction, the ratio of the size L5 of the second end face 3313 of the first electrode terminal 3a to the size L6 of the first end face 3111 of the first electrode terminal 3a is in the range of 25% to 100%. The second end face 3313 and the first end face 3111 of the second electrode terminal 3b satisfy the above size conditions, that is, along the first direction, the ratio of the size L5 of the second end face 3313 of the second electrode terminal 3b to the size L6 of the first end face 3111 of the second electrode terminal 3b is in the range of 25% to 100%.

[0185] Exemplarily, along the first direction, the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 may be, but is not limited to, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95%, or 100%.

[0186] Since during the grouping process of the battery cell 20, it is necessary to weld with another battery cell through the first end face 3111 to ensure overcurrent, a larger welding mark area needs to be ensured. Therefore, the area of the first end face 3111 needs to be set relatively large, and a smaller area of the second end face 3313 can also ensure the welding mark area with the tab. Therefore, by limiting the ratio of the size L5 of the second end face 3313 to the size L6 of the first end face 3111 along the first direction to the range of 25% to 100%, it is beneficial for the area of the first end face 3111 to be larger than the area of the second end face 3313, so that the welding mark area at both ends of the electrode terminal meets the respective overcurrent standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0187] In some embodiments of the present application, along the first direction, the size L6 of the first end face 3111 is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 is in the range of 10 mm to 30 mm.

[0188] It can be understood that the second end face 3313 and the first end face 3111 of the first electrode terminal 3a satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the first electrode terminal 3a is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 of the first electrode terminal 3a is in the range of 10 mm to 30 mm. The second end face 3313 and the first end face 3111 of the second electrode terminal 3b satisfy the above size conditions, that is, along the first direction, the size L6 of the first end face 3111 of the second electrode terminal 3b is in the range of 20 mm to 50 mm, and / or the size L5 of the second end face 3313 of the second electrode terminal 3b is in the range of 10 mm to 30 mm.

[0189] Exemplarily, the dimension L6 of the first end face 3111 may be, but is not limited to, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm or 50 mm. The dimension L5 of the second end face 3313 may be, but is not limited to, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm.

[0190] Thus, by respectively defining the dimension L6 of the first end face 3111 and the dimension L5 of the second end face 3313, it is more beneficial to make the weld mark areas at the two ends of the electrode terminal meet their respective overcurrent standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0191] In some embodiments of the present application, along the first direction, the dimension L6 of the first end face 3111 is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 is in the range of 10 mm to 25 mm.

[0192] It can be understood that the second end face 3313 and the first end face 3111 of the first electrode terminal 3a meet the above size conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the first electrode terminal 3a is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 of the first electrode terminal 3a is in the range of 10 mm to 25 mm. The second end face 3313 and the first end face 3111 of the second electrode terminal 3b meet the above size conditions, that is, along the first direction, the dimension L6 of the first end face 3111 of the second electrode terminal 3b is in the range of 25 mm to 40 mm, and / or the dimension L5 of the second end face 3313 of the second electrode terminal 3b is in the range of 10 mm to 25 mm.

[0193] Thus, by further restricting the value ranges of the dimension L6 of the first end face 3111 and the dimension L5 of the second end face 3313, it is more beneficial to make the weld mark areas at the two ends of the electrode terminal meet their respective overcurrent standards, thereby improving the charge and discharge efficiency of the battery cell 20.

[0194] In some embodiments of the present application, along the first direction, the center of the second end face 3313 is offset from the center of the tab connected to the second end face 3313.

[0195] It can be understood that the second end face 3313 of the first electrode terminal 3a satisfies the above position condition, that is, along the first direction, the center of the second end face 3313 of the first electrode terminal 3a is offset from the center of the first tab 21. The second end face 3313 of the second electrode terminal 3b satisfies the above position condition, that is, along the first direction, the center of the second end face 3313 of the second electrode terminal 3b is offset from the center of the second tab 22.

[0196] By arranging the center of the second end face 3313 to be offset from the center of the tab connected to the second end face 3313 along the first direction, it is beneficial to increase the continuous space on the side opposite to the offset direction, thereby facilitating the arrangement of other components, and further facilitating the improvement of the volumetric energy density of the battery cell 20.

[0197] Exemplarily, along the first direction, the center of the second end face 3313 of the first electrode terminal 3a is offset from the center of the first tab 21 in the direction towards the second electrode terminal 3b. In this way, the first electrode terminal 3a and the second electrode terminal 3b are closer, which is more beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous space on the side of the first electrode terminal 3a away from the second electrode terminal 3b is further increased, thereby facilitating the improvement of the volumetric energy density of the battery cell 20.

[0198] Exemplarily, along the first direction, the center of the second end face 3313 of the second electrode terminal 3b is offset from the center of the second tab 22 in the direction towards the first electrode terminal 3a. In this way, the first electrode terminal 3a and the second electrode terminal 3b are closer, which is more beneficial to improving the structural strength of the first housing wall 11. Moreover, the continuous space on the side of the second electrode terminal 3b away from the first electrode terminal 3a is further increased, thereby facilitating the improvement of the volumetric energy density of the battery cell 20.

[0199] In some embodiments of the present application, as Figure 6 shown, along the first direction, the distance L7 between the center of the second end face 3313 and the center of the tab connected to the second end face 3313 is not greater than 20 mm.

[0200] It can be understood that the second end face 3313 of the first electrode terminal 3a satisfies the above position condition, that is, along the first direction, the distance L7 between the center of the second end face 3313 of the first electrode terminal 3a and the center of the first tab 21 is not greater than 20 mm. The second end face 3313 of the second electrode terminal 3b satisfies the above position condition, that is, along the first direction, the distance L7 between the center of the second end face 3313 of the second electrode terminal 3b and the center of the second tab 22 is not greater than 20 mm.

[0201] Exemplarily, along the first direction, the distance L7 between the center of the second end face 3313 and the center of the tab connected to the second end face 3313 can be, but is not limited to, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm.

[0202] By limiting the distance L7 between the center of the second end face 3313 and the center of the tab connected to the second end face 3313 within a range not greater than 20 mm, it is beneficial to form a solder mark with sufficient area between the second end face 3313 and the tab, and it is also beneficial to increase the continuous space and improve the volumetric energy density of the battery cell 20.

[0203] In some embodiments of the present application, as Figure 6 shown, along the first direction, the distance L7 between the center of the second end face 3313 and the center of the tab connected to the second end face 3313 is 1 mm.

[0204] It can be understood that the second end face 3313 of the first electrode terminal 3a satisfies the above position condition, that is, along the first direction, the distance L7 between the center of the second end face 3313 of the first electrode terminal 3a and the center of the first tab 21 is 1 mm. The second end face 3313 of the second electrode terminal 3b satisfies the above position condition, that is, along the first direction, the distance L7 between the center of the second end face 3313 of the second electrode terminal 3b and the center of the second tab 22 is 1 mm.

[0205] In this way, by setting the distance L7 between the center of the second end face 3313 and the center of the tab connected to the second end face 3313 to be 1 mm, it is more beneficial to form a solder mark with sufficient area between the second end face 3313 and the tab, and it is also beneficial to increase the continuous space and improve the volumetric energy density of the battery cell 20.

[0206] In some embodiments of the present application, as Figure 6 shown, the dimension L8 of the surface of the tab facing the first housing wall 11 along the first direction is in the range of 25 mm to 65 mm.

[0207] It can be understood that both the first tab 21 and the second tab 22 satisfy the above dimension condition, that is, the dimension L8 of the surface of the first tab 21 facing the first housing wall 11 along the first direction is in the range of 25 mm to 65 mm, and the dimension L8 of the surface of the second tab 22 facing the first housing wall 11 along the first direction is in the range of 25 mm to 65 mm.

[0208] Exemplarily, the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction may be, but is not limited to, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 52 mm, 53 mm, 54 mm, 55 mm, 56 mm, 57 mm, 58 mm, 59 mm, 60 mm, 61 mm, 62 mm, 63 mm, 64 mm or 65 mm.

[0209] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction within the range of 25 mm to 65 mm, it is beneficial to keep the welding area of the tab and the electrode terminal within a suitable range and does not occupy too much space, thereby facilitating the increase of the continuous space and improving the volume energy density of the battery cell 20.

[0210] In some embodiments of the present application, as Figure 6 shown, the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm.

[0211] It can be understood that both the first tab 21 and the second tab 22 meet the above size conditions, that is, the dimension L8 of the surface of the first tab 21 facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm, and the dimension L8 of the surface of the second tab 22 facing the first housing wall 11 in the first direction is within the range of 30 mm to 50 mm.

[0212] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction within the range of 30 mm to 50 mm, it is more beneficial to keep the welding area of the tab and the electrode terminal within a suitable range and does not occupy too much space, thereby facilitating the increase of the continuous space and improving the volume energy density of the battery cell 20.

[0213] In some embodiments of the present application, as Figure 9 shown, along the first direction, the midpoint between the central axes of the first parts 31 of the first electrode terminal 3a and the second electrode terminal 3b deviates from the center of the first housing wall 11.

[0214] Thus, the continuous space on the side of the first housing wall 11 opposite to the deviation direction of the first electrode terminal 3a and the second electrode terminal 3b is larger, which is beneficial to the arrangement of other components and more beneficial to improving the volume energy density of the battery cell 20.

[0215] In some embodiments of the present application, as Figure 9 shown, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b to the center of the first housing wall 11 to the dimension L2 of the first housing wall 11 is not greater than 47.5%.

[0216] Exemplarily, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b to the center of the first housing wall 11 to the dimension L2 of the first housing wall 11 can be, but is not limited to, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47% or 47.5%.

[0217] Thus, by limiting the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b to the center of the first housing wall 11 to the dimension L2 of the first housing wall 11 within a range not greater than 47.5%, it enables the end of the first housing wall 11 opposite to the deviation direction to be sufficient for installing the first electrode terminal 3a and the second electrode terminal 3b, and also enables a larger continuous space on the side of the first housing wall 11 located opposite to the deviation direction of the first electrode terminal 3a and the second electrode terminal 3b, which is beneficial to the arrangement of other components and more conducive to improving the volume energy density of the battery cell 20.

[0218] In some embodiments of the present application, as Figure 9 shown, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b and the center of the first housing wall 11 to the dimension L2 of the first housing wall 11 is in the range of 40% - 47.5%.

[0219] Exemplarily, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b to the dimension L2 of the first housing wall 11 can be, but is not limited to, 40.2%, 40.5%, 40.7%, 41.3%, 41.5%, 41.8%, 42.1%, 42.5%, 42.6%, 43.4%, 43.5%, 43.9%, 44.4%, 44.5%, 44.8, 45.2, 45.5%, 46.3% or 46.5%.

[0220] Thus, along the first direction, the ratio of the distance L9 between the midpoint of the central axis of the first part 31 of the first electrode terminal 3a and the central axis of the first part 31 of the second electrode terminal 3b to the dimension L2 of the first housing wall 11 is limited to the range of 40% to 47.5%, so that one end of the first housing wall 11 opposite to the deviation direction is sufficient to mount the first electrode terminal 3a and the second electrode terminal 3b, and at the same time, the continuous space of the first housing wall 11 on the side opposite to the deviation direction of the first electrode terminal 3a and the second electrode terminal 3b can be made larger, which is beneficial to the arrangement of other components and more beneficial to improving the volumetric energy density of the battery cell 20.

[0221] In some embodiments of the present application, as Figure 4 shown, the dimension of the first housing wall 11 along its length direction X is in the range of 170 mm to 1200 mm.

[0222] Exemplarily, the dimension of the first housing wall 11 along its length direction X can be, but is not limited to, 170 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm or 1200 mm.

[0223] In order to verify that the dimension of the electrical connection area at the first housing wall 11 of the battery cell 20 without a transition piece in the present application in the first direction is reduced compared to the electrical connection area of the battery cell with a transition piece in the prior art in the first direction, the following takes the battery cell shown in Figure 10 in the prior art and the battery cell 20 shown in Figure 6 in the embodiments of the present application as examples for reasoning and verification.

[0224] Figure 6The battery cell 20 provided for some embodiments of the present application has no connecting piece. The first part 31, the middle part 32, and the second part 33 of each electrode terminal are arranged on the same central axis, and the projection of the second end face 3313 of each electrode terminal along the wall thickness direction Z of the first housing wall 11 all falls within the projection plane of the tab connected to the electrode terminal. The dimensions of the first end faces 3111 of the first electrode terminal 3a and the second electrode terminal 3b along the first direction are both represented by L6, and the minimum distance between the first parts 31 of the first electrode terminal 3a and the second electrode terminal 3b along the first direction is represented by L4. Therefore, the dimension of the space occupied by the parts of the two electrode terminals (the first electrode terminal 3a and the second electrode terminal 3b) located outside the first housing wall 11 along the first direction is 2×L6 + L4; the dimensions of the first tab 21 and the second tab 22 along the first direction are both represented by L8, and the minimum distance between the first tab 21 and the second tab 22 along the first direction is represented by L3. At this time, L3 is also the closest distance between the electrical connection structures inside the first housing wall 11. The dimension of the space occupied by the parts of the two electrode terminals (the first electrode terminal 3a and the second electrode terminal 3b) located inside the first housing wall 11 and the first tab 21 and the second tab 22 along the first direction is 2×L8 + L3. Thus, the dimension of the electrical connection area at the first housing wall 11 of the battery cell 20 without a connecting piece in the present application along the first direction is the larger of 2×L6 + L4 and 2×L8 + L3. Since the first part 31 uses the insulating structure 4 to wrap the side wall to ensure insulation, and the first tab 21 and the second tab 22 are not insulated by external objects, the minimum distance L4 between the first parts 31 of the first electrode terminal 3a and the second electrode terminal 3b along the first direction is usually set to be less than the minimum distance L3 between the first tab 21 and the second tab 22, that is, L4 < L3.

[0225] Figure 10 A battery cell in the prior art, the electrode terminals of which are connected to the tabs through the connecting pieces 6, and the two connecting pieces 6 are mirror-symmetrically distributed. Figure 10 In it, L0 represents the shortest dimension along the first direction required for a single connecting piece 6 to achieve electrical connection, L3' represents the closest distance between the internal electrical connection structures, L6' represents the dimension of the part of the electrode terminal located outside the housing along the first direction, and L8' represents the dimension of the electrode along the first direction. Therefore, Figure 10 the dimension of the electrical connection area of the battery cell in

[0226] Considering the process and the requirements of overcurrent inside and outside, it is set that L0 > L6', L0 > L8'; for more convenient comparison, it is set that L6 = L6', L3 = L3', L8 = L8'. Figure 10 The dimension of the electrical connection area inFigure 6 The difference in the dimension of the electrical connection region along the first direction is 2×L0 + L3’ + L6’ - (2×L6 + L4) = 2×L0 + L3’ + L6’ - 2×L6 - L4 = (2×L0 - L6’) + (L3 - L4) > L0; or, 2×L0 + L3’ + L6’ - (2×L8 + L3) = 2×L0 + L3’ + L6’ - 2×L8 - L3 = 2(L0 - L8’) + L6’ > L6’.

[0227] It can be seen that Figure 10 the dimension of the electrical connection region in Figure 6 along the first direction and the dimension of the electrical connection region in

[0228] In the second aspect of the present application, a battery 100 is provided, which includes at least one battery cell 20 provided in the first aspect.

[0229] Since the battery 100 includes the battery cell 20, the battery 100 has all the beneficial effects of the battery cell 20. Therefore, the battery 100 has high structural strength and high volume energy density.

[0230] In the third aspect of the present application, an energy storage device is provided, which includes: at least one battery cell 20 provided in the first aspect or a battery 100 provided in the second aspect.

[0231] Since the energy storage device includes the battery cell 20 or the battery 100, the energy storage device has all the beneficial effects of the battery cell 20 or the battery 100. Therefore, the energy storage device has high structural strength and is beneficial to reducing the accommodation space of the energy storage device for accommodating the battery cell 20 or the battery 100, or the energy storage device can accommodate a battery cell 20 or a battery 100 with a larger capacity in a limited accommodation space.

[0232] In the fourth aspect of the present application, an electrical device is provided, and the electrical device includes the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect for providing electrical energy.

[0233] Since the electrical device includes the battery cell 20 or the battery 100, the electrical device has all the beneficial effects of the battery cell 20 or the battery 100. Therefore, the structural strength of the electrical device is high, which is conducive to reducing the accommodation space of the electrical device for accommodating the battery cell 20 or the battery 100, or the electrical device can accommodate a battery cell 20 or a battery 100 with a larger capacity in a limited accommodation space.

[0234] Next, specific examples of some embodiments of the present application will be described with reference to the accompanying drawings.

[0235] As a specific example, the battery cell 20 includes a housing (housing 1), the housing has an end cover (first housing wall 11) and an accommodation cavity, an electrode assembly (electrode assembly 2) is accommodated in the accommodation cavity, the end cover is provided with two pole columns (first electrode terminal 3a and second electrode terminal 3b) spaced apart along the length direction of the end cover (length direction X of the first housing wall 11), the pole columns are directly welded to the pole ears (first pole ear 21 and second pole ear 22) of the electrode assembly, and the ratio of the distance between the central axes of the two pole columns to the dimension of the end cover along the length direction is not greater than 60%. Arranging the pole columns close to each other can improve the structural strength of the end cover, while leaving a relatively large space on the end cover for arranging other structures. At the same time, setting it without a transition piece can further increase the space for arranging structures on the end cover and reduce the space in the height direction.

[0236] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; 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 covered by the scope of the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing having a first housing wall and a receiving cavity; An electrode assembly, disposed in the accommodating cavity, having at least two pole tabs, wherein the at least two pole tabs include a first pole tab and a second pole tab; at least two electrode terminals, including a first electrode terminal and a second electrode terminal provided on the first shell wall, the first electrode terminal and the second electrode terminal are spaced apart along a first direction, the first electrode tab is directly connected to the first electrode terminal, the second electrode tab is directly connected to the second electrode terminal, each of the electrode terminals includes a first portion located outside the shell, Along the first direction, a ratio of a distance between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal to a size of the first housing wall is not greater than 60%.

2. The battery cell according to claim 1, characterized in that: Each of the electrode terminals further includes a middle portion disposed in the terminal mounting hole of the first shell wall and a second portion located on the inner side of the shell, wherein the second portion is connected to the tab.

3. The battery cell according to claim 2, characterized in that: In the electrode terminal, the first portion has an overlapping portion with the second portion in a wall thickness direction of the first housing wall.

4. The battery cell according to claim 3, characterized in that: In the same electrode terminal, part of the first portion overlaps the entire second portion in the wall thickness direction of the first housing wall.

5. The battery cell according to claim 3, characterized in that: In the same electrode terminal, the second portion includes a main body portion overlapping with the first portion in the wall thickness direction of the first shell wall and an extension portion extending beyond the first portion along the first direction, The extension portion of the first electrode terminal is located on a side of the main body of the first electrode terminal facing the second electrode terminal, and the extension portion of the second electrode terminal is located on a side of the main body of the second electrode terminal facing away from the first electrode terminal.

6. The battery cell according to claim 1, characterized in that: One of the first electrode tab and the second electrode tab is a positive electrode tab, and the other is a negative electrode tab.

7. The battery cell according to claim 1, characterized in that: The first pole tab and the second pole tab are both positive pole tabs, or the first pole tab and the second pole tab are both negative pole tabs.

8. The battery cell according to claim 7, characterized in that: The first electrode tab and the second electrode tab are formed as one body.

9. The battery cell according to claim 6, characterized in that: The first electrode tab and the second electrode tab are arranged at intervals.

10. The battery cell according to claim 7, characterized in that: The first electrode tab and the second electrode tab are arranged at intervals.

11. The battery cell according to claim 9 or 10, characterized in that: A minimum distance between the first pole tab and the second pole tab along the first direction is not less than 5 mm.

12. The battery cell according to any one of claims 1 to 10, characterized in that: Along the first direction, a distance between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal is no greater than 100 mm.

13. The battery cell according to any one of claims 1 to 10, characterized in that: Along the first direction, a minimum distance between the first portion of the first electrode terminal and the first portion of the second electrode terminal is not less than 2 mm.

14. The battery cell according to any one of claims 1 to 10, characterized in that: The first electrode terminal is welded to the first electrode tab, and the second electrode terminal is welded to the second electrode tab.

15. The battery cell according to claim 4, characterized in that: The end surface of the first portion of each electrode terminal away from the middle portion is a first end surface, and the end surface of the second portion away from the middle portion is a second end surface. The area of ​​the second end surface is smaller than the area of ​​the first end surface.

16. The battery cell according to claim 15, characterized in that: Along the first direction, a ratio of a size of the second end surface to a size of the first end surface is in a range of 20% to 150%.

17. The battery cell according to claim 15, characterized in that: Along the first direction, a ratio of a size of the second end surface to a size of the first end surface is in a range of 25% to 100%.

18. The battery cell according to any one of claims 15 to 17, characterized in that: Along the first direction, a size of the first end surface is in a range of 20 mm to 50 mm, and / or a size of the second end surface is in a range of 10 mm to 30 mm.

19. The battery cell according to any one of claims 15 to 17, characterized in that: Along the first direction, a size of the first end surface is in a range of 25 mm to 40 mm, and / or a size of the second end surface is in a range of 10 mm to 25 mm.

20. The battery cell according to any one of claims 15 to 17, characterized in that: Along the first direction, the center of the second end surface is offset from the center of the pole lug connected to the second end surface.

21. The battery cell according to claim 20, characterized in that: Along the first direction, a distance between a center of the second end surface and a center of the pole tab connected to the second end surface is no greater than 20 mm.

22. The battery cell according to claim 20, characterized in that: Along the first direction, a distance between a center of the second end surface and a center of the electrode tab connected to the second end surface is 1 mm.

23. The battery cell according to claim 9, characterized in that: A dimension of a surface of the pole tab facing the first housing wall along the first direction is in a range of 25 mm to 65 mm.

24. The battery cell according to claim 9, characterized in that: A dimension of a surface of the pole tab facing the first housing wall along the first direction is in a range of 30 mm to 50 mm.

25. The battery cell according to any one of claims 1 to 10, 15 to 17, and 21 to 24, characterized in that: Along the first direction, a midpoint between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal is disposed away from a center of the first housing wall.

26. The battery cell according to claim 25, characterized in that: Along the first direction, a ratio of a distance between a midpoint between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal and a center of the first housing wall to a size of the first housing wall is not greater than 47.5%.

27. The battery cell according to claim 25, characterized in that: Along the first direction, a ratio of a distance between a midpoint between a central axis of the first portion of the first electrode terminal and a central axis of the first portion of the second electrode terminal and a center of the first shell wall to a size of the first shell wall is in a range of 40% to 47.5%.

28. A battery, characterized in that: include: At least one battery cell according to any one of claims 1 to 27.

29. An energy storage device, characterized in that: include: At least one battery cell according to any one of claims 1 to 27 or a battery according to claim 28.

30. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 1 to 27 or the battery according to claim 28 for providing electrical energy.

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