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

Abstract

The utility model provides a battery monomer, a battery device, an energy storage device and a power utilization device. The battery monomer comprises a shell, the shell comprises a shell body with an opening and an end cover assembly covering the opening, the end cover assembly is provided with a liquid injection runner communicated with the space in the shell, the liquid injection runner comprises a liquid inlet and a liquid outlet which are communicated with each other, and the shell comprises a preset side wall; the electrode assembly is located in the shell, the electrode assembly and the preset side wall are arranged in the first direction, the arrangement direction of the end cover assembly and the electrode assembly intersects with the first direction, and at least one end, in the first direction, of the electrode assembly is provided with a liquid injection flow channel; the electrode terminal is electrically connected with the electrode assembly, the electrode terminal is installed on the shell, the electrode terminal which is located at the end, facing the liquid injection flow channel in the first direction, of the electrode assembly and is closest to the liquid injection flow channel in the first direction is a target terminal, and the liquid injection flow channel is located between the corresponding target terminal and the corresponding preset side wall in the first direction. Therefore, the infiltration effect of the electrolyte on the electrode assembly is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, battery devices, energy storage devices, and power-consuming 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, battery devices are also increasingly applied to the energy storage field, etc. In new energy vehicles equipped with batteries, the battery device can be used to provide power wholly or partly. In the energy storage field, the battery device can be installed in an energy storage box or directly installed on the user side.

[0003] In related technologies, a battery device includes a battery cell. The battery cell includes an electrode assembly and an electrolyte. The electrolyte is used to infiltrate the electrode assembly, but the infiltration effect of the electrolyte on the electrode assembly is poor. Summary of the Utility Model

[0004] To solve the above technical problems, embodiments of this application provide a battery cell, a battery device, an energy storage device, and a power-consuming device to improve the infiltration effect of the electrolyte on the electrode assembly.

[0005] Embodiments of this application are implemented through the following technical solutions.

[0006] In a first aspect of embodiments of this application, a battery cell is provided. The battery cell includes: a housing, including a housing body with an opening and an end cap assembly covering the opening. The end cap assembly has a liquid injection flow channel communicating with the space inside the housing. The liquid injection flow channel includes a liquid inlet and a liquid outlet communicating with each other. The housing body includes a preset side wall; an electrode assembly, located inside the housing. The electrode assembly and the preset side wall are arranged along a first direction. The arrangement direction of the end cap assembly and the electrode assembly and the first direction are arranged crosswise. At least one end of the electrode assembly along the first direction is provided with a liquid injection flow channel; an electrode terminal, electrically connected to the electrode assembly. The electrode terminal is installed on the housing. The electrode terminal located at one end of the electrode assembly along the first direction facing the liquid injection flow channel is the target terminal. The liquid injection flow channel is located between the corresponding target terminal and the corresponding preset side wall along the first direction.

[0007] The liquid injection flow channel is arranged between the target terminal and the preset side wall along the first direction, so that the liquid injection flow channel is relatively closer to the preset side wall than to the target terminal, which is conducive to the electrolyte flowing from between the electrode assembly and the preset side wall to the bottom of the electrode assembly as much as possible, reducing the accumulation of the electrolyte at the top of the electrode assembly. The electrolyte flows to one end of the preset side wall as much as possible, which to a certain extent inhibits the flow path of the electrolyte infiltrating from the surrounding to the middle. Thus, the probability of the electrode assembly being in a liquid seal situation is reduced, the electrolyte infiltration performance in the middle of the electrode assembly during the static state of the battery cell is improved, the infiltration effect of the electrolyte on the electrode assembly is improved, and further the overall performance of the battery cell is improved.

[0008] In some embodiments, the electrode terminal is located at the same end of the electrode assembly along the arrangement direction of the electrode assembly and the end cap assembly, and electrode terminals are provided at both opposite ends of the electrode assembly along the first direction. Among the electrode terminals at both ends, the polarity of the electrode terminal at one end is positive, and the polarity of the electrode terminal at the other end is negative.

[0009] Electrode terminals are provided at both opposite ends of the electrode assembly along the first direction. Therefore, the distance between the two electrode terminals along the first direction is farther. As a result, the target terminal of the two electrode terminals is closer to the preset side wall along the first direction, and the injection channel is closer to the preset side wall, which is more conducive to the electrolyte flowing from between the electrode assembly and the preset side wall to the bottom of the electrode assembly as much as possible, further reducing the accumulation of electrolyte at the top of the electrode assembly, reducing the probability of liquid sealing of the electrode assembly, and improving the wetting effect of the electrolyte on the electrode assembly, thereby improving the overall performance of the battery cell.

[0010] In some embodiments, the electrode assembly is spaced apart from the preset side wall, and the liquid outlet is at least partially located between the electrode assembly and the corresponding preset side wall along the first direction; or, the distance between the extreme position of the liquid outlet along the first direction away from the preset side wall and the extreme position of the electrode assembly along the first direction toward the preset side wall is less than or equal to 1 cm and greater than or equal to 0 cm.

[0011] As a result, more electrolyte can flow directly between the electrode assembly and the corresponding preset side wall after flowing out from the liquid outlet, which can further reduce the accumulation of electrolyte on the top of the electrode assembly, further reduce the probability of liquid sealing in the electrode assembly, and enhance the wetting effect of the electrolyte on the electrode assembly.

[0012] In some embodiments, the liquid outlet is located between the electrode assembly and the corresponding preset side wall along the first direction.

[0013] Since the liquid outlet is located between the electrode assembly and the corresponding preset side wall along the first direction, almost all of the electrolyte can flow out of the liquid outlet and directly flow between the electrode assembly and the corresponding preset side wall, thereby reducing the accumulation of electrolyte on the top of the electrode assembly, reducing the probability of liquid sealing in the electrode assembly, and improving the wetting effect of the electrolyte on the electrode assembly.

[0014] In some embodiments, the electrode assembly is spaced apart from a predetermined side wall.

[0015] Since the electrode assembly is spaced apart from the preset side wall, the channel between the electrode assembly and the preset side wall is larger, and the electrolyte can flow directly from the end of the electrode assembly facing the end cover assembly to the end of the electrode assembly facing away from the end cover assembly, thereby reducing the accumulation of electrolyte at the end of the electrode assembly close to the preset side wall along the first direction, reducing the probability of liquid sealing in the electrode assembly, and improving the wetting effect of the electrolyte on the electrode assembly.

[0016] In some embodiments, the end cover assembly includes: a main end cover, which is covered on the opening, and the liquid inlet is formed on the main end cover; a guide member, which is connected to the main end cover, the guide member is at least partially located in the outer shell, the liquid outlet is formed on the guide member, and the injection channel is spanned between the main end cover and the guide member.

[0017] Since the injection channel spans the main end cover and the guide member, during the injection process, the guide member can guide more electrolyte to between the electrode assembly and the corresponding preset side wall, thereby allowing more electrolyte to flow to between the electrode assembly and the corresponding preset side wall, reducing the accumulation of electrolyte at the top of the electrode assembly, reducing the probability of liquid sealing in the electrode assembly, and allowing more electrolyte to infiltrate from the end of the electrode assembly away from the end cover assembly to the end of the electrode assembly close to the end cover assembly along the arrangement direction of the end cover assembly and the electrode assembly, thereby further improving the electrolyte infiltration performance of the middle part of the electrode assembly during the static process of the battery cell, thereby improving the overall performance of the battery cell.

[0018] In some embodiments, the liquid outlet is located at one end of the guide member along the first direction toward the corresponding preset side wall.

[0019] Since the liquid outlet is located at one end of the guide member along the first direction toward the corresponding preset side wall, more electrolyte can flow into between the electrode assembly and the corresponding preset side wall, reducing the accumulation of electrolyte at the top of the electrode assembly, reducing the probability of liquid sealing in the electrode assembly, and further improving the electrolyte wetting performance in the middle of the electrode assembly during the static process of the battery cell, thereby improving the overall performance of the battery cell.

[0020] In some embodiments, the flow guide and the electrode assembly are spaced apart along the arrangement direction of the main end cover and the electrode assembly.

[0021] The flow guide and the electrode assembly are spaced apart to reduce the probability of contact between the flow guide and the electrode assembly, and reduce the probability of the flow guide damaging or damaging the electrode assembly.

[0022] In some embodiments, the guide member includes: a guide side wall, including a first guide side wall connected to the main end cover, the first guide side wall and the corresponding preset side wall are arranged relative to each other along a first direction; a bottom wall, connected to an end of the first guide side wall away from the main end cover along the arrangement direction of the main end cover and the electrode assembly, and the bottom wall is at least partially located between the first guide side wall and the corresponding preset side wall along the first direction.

[0023] Since the guide member includes a structure of a guide side wall and a bottom wall, more electrolyte can flow to between the electrode assembly and the corresponding preset side wall through the guidance of the guide side wall and the bottom wall, thereby further improving the electrolyte wetting performance of the electrode assembly and improving the performance of the battery cell.

[0024] In some embodiments, the diversion sidewall further includes a second diversion sidewall. The second diversion sidewall is at least partially located between the bottom wall and the main end cap along the arrangement direction of the main end cap and the electrode assembly. The second diversion sidewall is respectively connected to the first diversion sidewall and the bottom wall. The second diversion sidewalls are provided at both opposite ends of the bottom wall along the second direction, and the second direction is respectively arranged to intersect with the first direction and the arrangement direction of the main end cap and the electrode assembly.

[0025] The diversion sidewall further includes a second diversion sidewall. The second diversion sidewalls are located at both opposite ends of the bottom wall along the second direction. The second diversion sidewalls can block the electrolyte from flowing out of both ends of the bottom wall along the second direction, so that the electrolyte flows out from the liquid outlet of the diversion member facing the preset sidewall, and thus can further make more electrolyte flow between the electrode assembly and the corresponding preset sidewall, thereby improving the wetting performance of the electrode assembly and the performance of the battery cell.

[0026] In some embodiments, the distance between the bottom wall and the main end cap along the arrangement direction of the main end cap and the electrode assembly is a preset distance, and the preset distance gradually increases along the direction from the first diversion sidewall to the corresponding preset sidewall.

[0027] Since the preset distance gradually increases along the direction from the first diversion sidewall to the corresponding preset sidewall, the bottom wall can be inclined. This can not only accelerate the rate of the electrolyte flowing into the space between the electrode assembly and the corresponding preset sidewall, speed up the liquid injection speed, and thus improve the manufacturing rate of the battery cell; but also reduce the probability of the electrolyte remaining on the bottom wall, reduce the probability of electrolyte waste, and save costs.

[0028] In some embodiments, the liquid injection flow channel includes a main flow channel and a guiding flow channel that are interconnected. The main flow channel is formed in the main end cap, and the guiding flow channel is formed in the diversion member. The liquid inlet is located at one end of the main flow channel away from the diversion member. The opening at one end of the main flow channel away from the liquid inlet is a transition port, and the transition port is located between the first diversion sidewall and the corresponding preset sidewall along the first direction.

[0029] Since the liquid injection flow channel includes a main flow channel and a guiding flow channel that are interconnected, the electrolyte flowing in from the liquid inlet can flow to the guiding flow channel through the transition port of the main flow channel. And because the transition port is located between the first diversion sidewall and the corresponding preset sidewall along the first direction, it can make all the electrolyte flowing out from the transition port flow to the guiding flow channel, so that most of the electrolyte flows between the electrode assembly and the preset sidewall, thereby improving the wetting performance of the electrode assembly and the performance of the battery cell.

[0030] In some embodiments, the diversion member is located inside the housing.

[0031] Since the diversion member is located inside the outer shell, along the arrangement direction of the end cap assembly and the electrode assembly, the end of the diversion member away from the electrode assembly does not extend beyond the end of the end cap assembly away from the electrode assembly, which is beneficial to more easily seal the liquid injection channel after the liquid injection is completed.

[0032] In some embodiments, the main end cap includes an end cap body and an insulating member installed at one end of the end cap body facing the electrode assembly, and the diversion member is integrally formed with the insulating member.

[0033] Since the diversion member is integrally formed with the insulating member, it is beneficial to reduce the number of components and improve the manufacturing efficiency.

[0034] In some embodiments, the end cap assembly further includes a stop platform connected to one end of the main end cap facing the electrode assembly. The stop platform has an avoidance hole. The projection area of the avoidance hole along the first direction is the first projection area, and the projection area of the diversion member along the first direction is the second projection area. The first projection area spans across opposite ends of the second projection area along the second direction. Along the arrangement direction of the end cap assembly and the electrode assembly, at least part of the second projection area overlaps with the first projection area.

[0035] Since the end cap assembly includes a stop platform, the stop platform can position the electrode assembly along the arrangement direction of the end cap assembly and the electrode assembly. Since the stop platform has an avoidance hole, during the liquid injection process, the stop platform can avoid at least part of the electrolyte, so that more and faster electrolyte can flow into the space between the electrode assembly and the corresponding preset side wall, thereby further improving the wetting performance of the electrode assembly and the performance of the battery cell.

[0036] In some embodiments, the electrode assembly has a flat area. The electrode assembly includes a positive electrode plate and a negative electrode plate. The part of the positive electrode plate located in the flat area and the part of the negative electrode plate located in the flat area are stacked along the second direction. The second direction intersects with the first direction and the arrangement direction of the end cap assembly and the electrode assembly respectively.

[0037] Since the part of the positive electrode plate located in the flat area and the part of the negative electrode plate located in the flat area are stacked along the second direction, the electrolyte can flow to the space between the electrode assembly and the preset side wall along the first direction, reducing the probability that the electrolyte can hardly flow to the space between the electrode assembly and the side wall of the battery cell due to the heat collision of the battery cell. Specifically, if the preset side wall is a side wall intersecting with the second direction, when the battery cell expands due to heat, at least part of the electrode assembly located in the flat area may bulge along the second direction and towards the direction of the side wall, which may lead to a reduction in the distance between the electrode assembly and the side wall or even the distance becomes zero, thus affecting the electrolyte flow.

[0038] In some embodiments, the end cap assembly further has an exhaust port spaced from the liquid inlet. The exhaust port is in communication with the space inside the housing, and the arrangement direction of the exhaust port and the liquid inlet and the arrangement direction of the end cap assembly and the electrode assembly are arranged crosswise.

[0039] Since the end cap assembly has an exhaust port, during the process of injecting the electrolyte, the gas inside the housing can escape through the exhaust port, which can not only improve the injection speed of the electrolyte, but also be beneficial to improving the wetting performance of the electrolyte of the electrode assembly.

[0040] In some embodiments, along a first direction, the liquid inlet is located at one end of the end cap assembly along the first direction, and the exhaust port is located at the other end of the end cap assembly along the first direction.

[0041] Since the liquid inlet is located at one end of the end cap assembly along the first direction and the exhaust port is located at the other end of the end cap assembly along the first direction, the distance along the first direction between the liquid inlet and the exhaust port is relatively long. Therefore, it is more conducive to the discharge of the gas inside the housing during the injection process, and it is also beneficial to reduce the probability of the event that when injecting liquid and evacuating gas simultaneously, due to the low pressure at the exhaust port, the electrolyte near the liquid outlet is affected or even the electrolyte near the liquid outlet is sucked to the exhaust port.

[0042] In some embodiments, the battery cell includes a seal, the seal closes the liquid injection flow channel, and the seal is fixedly connected to the end cap assembly.

[0043] The seal closes the liquid injection flow channel, reducing the probability of the electrolyte flowing out of the housing and improving the overall performance of the battery cell.

[0044] In some embodiments, the end cap assembly includes a main end cap covering the opening, and both the liquid inlet and the liquid outlet are formed on the main end cap; at least a part of the liquid outlet along the first direction is located between the electrode assembly and the corresponding preset side wall.

[0045] Since at least a part of the liquid outlet along the first direction is located between the electrode assembly and the corresponding preset side wall, at least a part of the electrolyte can directly flow to between the electrode assembly and the corresponding preset side wall after flowing out of the liquid outlet, reducing the accumulation of the electrolyte on the top of the electrode assembly, reducing the probability of the electrode assembly being liquid-sealed, improving the wetting performance of the electrolyte in the middle of the electrode assembly during the stationary process of the battery cell, and further improving the overall performance of the battery cell.

[0046] In some embodiments, the shape of the housing is square.

[0047] Thus, the wetting performance of the electrolyte of the battery cell with a square housing can be reduced.

[0048] The second aspect of the present application provides a battery device, and the battery device includes a plurality of battery cells provided according to the first aspect.

[0049] Since the battery device includes the above-mentioned battery cells, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells can be enhanced, and thus the overall performance of the battery device can be improved.

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

[0051] Since the energy storage device includes the above-mentioned battery cells or battery devices, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells or battery devices can be enhanced, and thus the overall performance of the energy storage device can be improved.

[0052] The fourth aspect of the present application provides an electrical device, which includes a battery cell provided according to the first aspect, a battery device provided according to the second aspect, or an energy storage device provided according to the third aspect. The battery cell or battery device is used to store or provide electric energy.

[0053] Since the electrical device includes the above-mentioned battery cells, battery devices or energy storage devices, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells, battery devices or energy storage devices can be enhanced, and thus the overall performance of the electrical device can be improved.

[0054] The beneficial effects of the embodiments of the present application include: it is beneficial for the electrolyte to flow from between the electrode assembly and the preset side wall to the bottom of the electrode assembly as much as possible, reducing the accumulation of the electrolyte at the top of the electrode assembly. The electrolyte flowing to one end of the preset side wall inhibits the flow path of the electrolyte infiltrating from the surrounding to the middle to a certain extent, thereby reducing the probability of the electrode assembly being liquid-sealed, improving the wetting performance of the electrolyte in the middle of the electrode assembly during the static state of the battery cell, improving the wetting effect of the electrolyte on the electrode assembly, and thus improving the overall performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] By reading the detailed description of the preferred embodiments below, 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:

[0056] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0057] Figure 2 is a three-dimensional exploded schematic diagram of a battery device provided by some embodiments of the present application;

[0058] Figure 3 Schematic diagram of the structure of a battery cell provided for some embodiments of the present application;

[0059] Figure 4 Provided for some embodiments of the present application Figure 3 Schematic diagram of the A-A cross-section of

[0060] Figure 5 Provided for some embodiments of the present application Figure 4 Enlarged schematic diagram of area A1 of

[0061] Figure 6 Provided for some embodiments of the present application Figure 3 Schematic diagram of the B-B cross-section of

[0062] Figure 7 Schematic diagram of the structure of a battery cell provided for other embodiments of the present application;

[0063] Figure 8 Provided for other embodiments of the present application Figure 7 Schematic diagram of the C-C cross-section of

[0064] Figure 9 Provided for some embodiments of the present application Figure 8 Enlarged schematic diagram of area C1 of

[0065] Figure 10 Schematic diagram of the structure of an electrode assembly provided for some embodiments of the present application;

[0066] Figure 11 Schematic diagram of the structure of an electrode assembly provided for still other embodiments of the present application;

[0067] Figure 12 Schematic diagram of the structure of an energy storage device provided for some embodiments of the present application.

[0068] Description of reference numerals

[0069] 1000 Vehicle; 2000 Energy storage device; 100 Battery device; 200 Controller; 300 Motor; 10 Battery cell; 20 Case; 20a First case; 20b Second case; 1 Outer shell; 11 Housing; 111 Preset side wall; 12 End cap assembly; 121 Liquid injection flow channel; 121a Liquid inlet; 121b Liquid outlet; 1211 Main flow channel; 1211a Transition port; 1212 Guide flow channel; 122 Main end cap; 1221 End cap body; 1222 Insulating part; 123 Deflector; 1231 Deflecting side wall; 12311 First deflecting side wall; 12312 Second deflecting side wall; 1232 Bottom wall; 124 Stopping platform; 1241 Avoidance hole; 125 Exhaust port; 2 Electrode assembly; 22 Positive electrode plate; 23 Negative electrode plate; 24 Separator; 25 Straight area; 26 Corner area; 4 Electrode terminal; X First direction; Y Second direction; Z Third direction. Detailed implementation manners

[0070] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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.

[0072] In the description of the embodiments of the present 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 the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0073] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and 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 explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0075] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0076] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "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 one; 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.

[0077] 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.

[0078] Below, this application is described in detail.

[0079] In the related art, the electrode assembly and the preset side wall are arranged in the first direction. The electrode terminal at the same end of the injection liquid flow channel as the electrode assembly in the first direction is the target terminal. The target terminal is located between the injection liquid flow channel and the corresponding preset side wall in the first direction, so that the injection liquid flow channel is away from the preset side wall relative to the target terminal. During the injection process of the battery cell, the arrangement direction of the end cover assembly and the electrode assembly is arranged in the up-down direction, and the end cover assembly is located above the electrode assembly. It is difficult for the electrolyte injected from the injection liquid flow channel to flow from between the electrode assembly and the preset side wall to the bottom of the electrode assembly. Part of the electrolyte accumulates on the top of the electrode assembly, and the electrolyte may infiltrate from the periphery of the electrode assembly to the middle of the electrode assembly, resulting in the electrolyte around the electrode assembly being easily sealed. Therefore, it is difficult for the gas in the middle of the electrode assembly to be discharged, thus affecting the infiltration effect of the electrolyte on the middle of the electrode assembly. To reduce the probability of liquid sealing of the electrode assembly, the injection liquid flow channel can be arranged between the target terminal and the preset side wall in the first direction, so that the injection liquid flow channel is relatively close to the preset side wall relative to the target terminal, which is beneficial to the electrolyte flowing from between the electrode assembly and the preset side wall to the bottom of the electrode assembly as much as possible, reducing the accumulation of the electrolyte on the top of the electrode assembly. The end of the electrolyte flowing to the preset side wall as much as possible inhibits the flow path of the electrolyte infiltrating from the periphery to the middle to a certain extent, thereby reducing the probability of the electrode assembly being liquid-sealed, improving the infiltration effect of the electrolyte on the electrode assembly, and further improving the overall performance of the battery cell.

[0080] Based on such a design concept, an embodiment of the present application provides a battery cell. The battery cell includes: a housing, including a housing body with an opening and an end cover assembly covering the opening. The end cover assembly has an injection liquid flow channel communicating with the space inside the housing. The injection liquid flow channel includes a liquid inlet and a liquid outlet communicating with each other. The housing body includes a preset side wall; an electrode assembly, located inside the housing. The electrode assembly and the preset side wall are arranged in the first direction. The arrangement direction of the end cover assembly and the electrode assembly and the first direction are arranged crosswise. At least one end of the electrode assembly in the first direction is provided with an injection liquid flow channel; an electrode terminal, electrically connected to the electrode assembly. The electrode terminal is installed on the housing. The electrode terminal at one end of the electrode assembly in the first direction facing the injection liquid flow channel is the target terminal. The injection liquid flow channel is located between the corresponding target terminal and the corresponding preset side wall in the first direction.

[0081] The liquid injection flow channel is arranged between the target terminal and the preset side wall along the first direction, such that the liquid injection flow channel is relatively closer to the preset side wall than the target terminal, which is beneficial for the electrolyte to flow from between the electrode assembly and the preset side wall to the bottom of the electrode assembly as much as possible, reducing the accumulation of the electrolyte at the top of the electrode assembly. The end where the electrolyte flows to the preset side wall as much as possible inhibits the flow path of the electrolyte infiltrating from the periphery to the middle to a certain extent. Thus, the probability of the electrode assembly being in a liquid seal situation is reduced, the electrolyte infiltration performance in the middle of the electrode assembly during the static state of the battery cell is improved, the infiltration effect of the electrolyte on the electrode assembly is enhanced, and further the overall performance of the battery cell is improved.

[0082] The battery cell and the battery device provided by the embodiments of the present application can be but are not limited to being used in power-consuming devices such as energy storage devices, vehicles, ships, or aircraft.

[0083] The embodiments of the present application further provide an energy storage device including the above battery device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0084] The embodiments of the present application further provide a power-consuming device including the above battery device. The power-consuming device can be but is not limited to a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0085] In the following embodiments, for the convenience of description, the power-consuming device in an embodiment of the present application is taken as the vehicle 1000 as an example for description.

[0086] Figure 1 A schematic structural diagram of the vehicle 1000 provided for some embodiments of the present application. 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 device 100 is arranged inside the vehicle 1000. The battery device 100 can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 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.

[0087] In some embodiments of the present application, the battery device 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, providing driving power for the vehicle 1000 instead of or partially replacing fuel or natural gas.

[0088] Figure 2 A three-dimensional exploded schematic view of the battery device 100 provided for some embodiments of the present application; the battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 10, and the plurality of battery cells 10 are connected in series, parallel or in a hybrid connection through a busbar component.

[0089] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 10; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells 10 into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 10 with cable ties.

[0090] In some embodiments, the battery device 100 may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

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

[0092] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells 10 to the box body 20.

[0093] As an example, the box body 20 may include a first box body 20a and a second box body 20b. The first box body 20a and the second box body 20b are snapped together so that a closed space is formed inside the box body 20 to accommodate the battery cell 10 assembly. The term "closed" here means covered or closed, which may be sealed or non-sealed. The first box body 20a may be a top cover or a bottom plate. In the embodiments of the present application, the battery cell 10 may be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after the battery cell 10 is discharged and can continue to be used.

[0094] The battery cell 10 may 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.

[0095] The battery cell 10 generally includes an electrode assembly 2 (see Figure 4 ). For example Figure 10 and Figure 11 as shown, the electrode assembly 2 includes a positive electrode, a negative electrode, and a separator 24. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator 24 is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through.

[0096] In some embodiments, the positive electrode may be a positive electrode tab 22, and the positive electrode tab 22 may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0097] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0098] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as a metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, titanium, etc. may be used. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of the present application are not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphate may include but are not limited to lithium iron phosphate (such as LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc.

[0100] In some embodiments, the positive electrode may be made of foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0101] In some embodiments, the negative electrode may be the negative electrode tab 23, and the negative electrode tab 23 may include a negative current collector.

[0102] As an example, the negative current collector may be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive current collector may be aluminum, and the material of the negative current collector may be copper.

[0103] In some embodiments, the electrode assembly 2 further includes a separator 24, and the separator 24 is disposed between the positive electrode and the negative electrode.

[0104] In some embodiments, the separator 24 is a separator membrane. The type of the separator membrane in the embodiments of the present application is not particularly limited, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0105] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0106] In some embodiments, the separator 24 is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays a role in transmitting ions and isolating the positive and negative electrodes.

[0107] In some embodiments, the battery cell 10 further includes an electrolyte, and the electrolyte plays a role in conducting ions between the positive and negative electrodes. The type of the electrolyte in the embodiments of the present application is not specifically limited and can be selected according to requirements. The electrolyte may be liquid, gel-like, or solid.

[0108] In some embodiments, the electrode assembly 2 is a wound structure. The positive electrode tab 22 and the negative electrode tab 23 are wound into a wound structure.

[0109] In some embodiments, the electrode assembly 2 is a stacked structure.

[0110] As an example, a plurality of positive electrode tabs 22 and a plurality of negative electrode tabs 23 may be respectively provided, and the plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 23 are alternately stacked.

[0111] As an example, a plurality of positive electrode sheets 22 may be provided, and the negative electrode sheet 23 may be folded to form a plurality of stacked folded segments, with one positive electrode sheet 22 being sandwiched between adjacent folded segments.

[0112] As an example, the positive electrode sheet 22 and the negative electrode sheet 23 are both folded to form a plurality of stacked folded sections.

[0113] As an example, a plurality of separators 24 may be provided, each of which is disposed between any adjacent positive electrode sheets 22 or negative electrode sheets 23 .

[0114] As an example, the separator 24 may be disposed continuously, and disposed between any adjacent positive electrode sheets 22 or negative electrode sheets 23 by folding or winding.

[0115] In some embodiments, the shape of the electrode assembly 2 can be cylindrical, flat, or polygonal.

[0116] In some embodiments, the electrode assembly 2 is provided with a tab (not shown), which can lead current out of the electrode assembly 2. The tab includes a positive tab and a negative tab.

[0117] In some embodiments, the battery cell 10 may include a housing 1. The housing 1 is used to encapsulate the electrode assembly 2 and the electrolyte and other components. 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 shell) or an aluminum-plastic film.

[0118] As an example, the battery cell 10 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 polygonal prismatic battery cell. The polygonal prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc. There is no particular limitation in the embodiments of the present application.

[0119] In some embodiments, Figure 3 As shown, the housing 1 includes an end cap assembly 12 and a shell 11, the shell 11 is provided with an opening, and the end cap assembly 12 closes the opening to form a closed space for accommodating the electrode assembly 2 and electrolyte and other substances. The shell 11 may be provided with one or more openings. One or more end cap assemblies 12 may also be provided.

[0120] In some embodiments, at least one electrode terminal 4 is provided on the housing 1, and the electrode terminal 4 is electrically connected to the tab (not shown). The electrode terminal 4 can be directly connected to the tab, or indirectly connected to the tab through a transition component. The electrode terminal 4 can be provided on the end cap assembly 12, or on the housing 11.

[0121] In some embodiments, a pressure relief mechanism (not shown) is disposed on the housing 1 , and is used to release the internal pressure of the battery cell 10 .

[0122] Next, with reference to Figures 3 to 11 some embodiments of the present application will be described in detail.

[0123] Figure 3 Schematic diagram of the structure of the battery cell 10 provided for some embodiments of the present application; Figure 4 Provided for some embodiments of the present application Figure 3 Schematic diagram of the A-A cross-section; Figure 5 Provided for some embodiments of the present application Figure 4 Enlarged schematic diagram of the A1 area; Figure 6 Provided for some embodiments of the present application Figure 3 Schematic diagram of the B-B cross-section; Figure 7 Schematic diagram of the structure of the battery cell provided for some other embodiments of the present application; Figure 8 Provided for some other embodiments of the present application Figure 7 Schematic diagram of the C-C cross-section; Figure 9 Provided for some embodiments of the present application Figure 8 Enlarged schematic diagram of the C1 area; Figure 10 Schematic diagram of the structure of the electrode assembly 2 provided for some embodiments of the present application; Figure 11 Schematic diagram of the structure of the electrode assembly 2 provided for some other embodiments of the present application.

[0124] In the description of the embodiments of the present disclosure, for ease of description, the direction where the arrow X is located is used to represent the "first direction X", the direction where the arrow Y is located is used to represent the "second direction Y", and the direction where the arrow Z is located is used to represent the "third direction Z". Among them, the first direction X, the second direction Y, and the third direction Z intersect pairwise and the three directions are not coplanar. Further, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise.

[0125] The first aspect of the present application provides a battery cell 10, as Figures 3 to 9As shown, the battery cell 10 includes a housing 1, an electrode assembly 2, and an electrode terminal 4. The housing 1 includes a housing body 11 having an opening and an end cap assembly 12 covering the opening. The end cap assembly 12 has a liquid injection flow channel 121 communicating with the space inside the housing 1. The liquid injection flow channel 121 includes a liquid inlet 121a and a liquid outlet 121b that communicate with each other. The housing body 11 includes a preset side wall 111. The electrode assembly 2 is located inside the housing 1. The electrode assembly 2 and the preset side wall 111 are arranged along a first direction X. The end cap assembly 12 is arranged crosswise to the arrangement direction of the electrode assembly 2 and the first direction X. At least one end of the electrode assembly 2 along the first direction X is provided with the liquid injection flow channel 121. The electrode terminal 4 is electrically connected to the electrode assembly 2. The electrode terminal 4 is installed on the housing 1. Among the electrode terminals 4, the electrode terminal 4 located at one end of the electrode assembly 2 along the first direction X facing the liquid injection flow channel 121 is the target terminal. The liquid injection flow channel 121 is located between the corresponding target terminal and the corresponding preset side wall 111 along the first direction.

[0126] As Figure 3 and Figure 4 or Figure 7 and Figure 8 As shown, the battery cell 10 includes a housing 1. The housing 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), etc. The battery cell 10 further includes an electrode assembly 2. In some embodiments, the housing 1 can be a sealed structure or a non-sealed structure.

[0127] As Figure 4 , Figure 10 and Figure 11 As shown, the battery cell 10 includes an electrode assembly 2. The electrode assembly 2 includes a positive electrode plate 22, a negative electrode plate 23, and a separator 24. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator 24 is disposed between the positive electrode plate 22 and the negative electrode plate 23, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through at the same time. In Figure 10 In the shown embodiment, as the electrode assembly 2, a laminated winding body formed by laminating and winding the positive electrode plate 22, the negative electrode plate 23, and the separator 24 is shown. In Figure 11 In the shown embodiment, as the electrode assembly 2, a stacked structure formed by sequentially laminating the positive electrode plate 22, the separator 24, the negative electrode plate 23, etc. is shown.

[0128] In some embodiments, as Figure 3 and Figure 4 shown in the orientation, the end cap assembly 12 can be located at the top, bottom, left end, right end, front end, or rear end of the housing body, etc. In a specific embodiment, the end cap assembly 12 is located at the top of the housing body.

[0129] In some embodiments, the electrode assembly 2 includes a tab, and the electrode assembly 2 is electrically connected to the electrode terminal 4 via the tab. The tab and the electrode terminal 4 may be connected directly or indirectly, for example, via a transition component.

[0130] In some embodiments, the electrode terminals are mounted to the end cap assemblies.

[0131] In some embodiments, Figures 3 to 9 As shown, the end cap assembly 12 has a liquid injection channel 121, and the liquid injection channel 121 includes a liquid inlet 121a and a liquid outlet 121b that are interconnected. The liquid injection channel 121 connects the space inside the shell 1 and the space outside the shell 1, and electrolyte can be injected into the shell 1 from outside the shell 1 through the liquid injection channel 121. The electrolyte can be injected into the liquid inlet 121a, and after the electrolyte flows through the liquid injection channel 121, it reaches the liquid outlet 121b and flows into the shell 1. Among them, the liquid inlet 121a refers to the inlet of the electrolyte flowing into the liquid injection channel 121, and the liquid outlet 121b refers to the outlet of the electrolyte flowing out of the liquid injection channel 121.

[0132] Optionally, the injection channel 121 can be a gap formed on the end cover assembly 12 that connects the inside and outside of the shell 1; it can also be an internal channel of a pipeline structure arranged on the end cover assembly 12 that connects the inside and outside of the shell 1; it can also be a guide channel of a guide member formed on the end cover assembly 12 that connects the inside and outside of the shell 1 and can guide the electrolyte flowing into the gap to a specific position, wherein the liquid inlet 121a refers to the inlet through which the electrolyte flows into the gap, and the liquid outlet 121b refers to the outlet through which the electrolyte flows out of the guide member.

[0133] Optionally, the injection channel 121 can extend along a third direction Z; the injection channel 121 can also extend along the first direction X, and the closer to the preset side wall 111, the farther the lower end of the injection channel 121 is from the upper end of the end cover assembly 12; the injection channel 121 can also extend along multiple directions, for example, the injection channel 121 can extend along the third direction Z, and then extend along the first direction X, for example, it can extend along the first direction X, getting closer and closer to the preset side wall 111.

[0134] The present application does not specifically limit the shape of the liquid inlet 121a, as long as the electrolyte can be injected. The present application does not specifically limit the shape of the liquid outlet 121b, as long as the electrolyte can flow out. The shape, size, etc. of the liquid inlet 121a and the liquid outlet 121b are not specifically limited. The liquid inlet 121a and the liquid outlet 121b can be one group or multiple groups. For example, the liquid inlet 121a can be circular, and the inner diameter of the liquid inlet 121a can be in the range of 2mm~3mm.

[0135] In a specific embodiment, Figure 3 and Figure 4or Figure 8 and Figure 9 As shown, the housing 11 includes a preset sidewall 111. The preset sidewall 111 and the electrode assembly 2 are arranged along the first direction X. The end cap assembly 12 and the electrode assembly 2 are arranged along the third direction Z. The first direction X and the third direction Z intersect.

[0136] In some embodiments, the first direction X and the third direction Z intersect perpendicularly.

[0137] In some embodiments, along the first direction X, among the opposite sidewalls of the housing, the sidewall closer to the target terminal is the preset sidewall 111 corresponding to the target terminal. As Figure 4 shown, along the first direction X, the target terminal is located at one end of the electrode assembly 2 facing the corresponding preset sidewall 111. The liquid injection channel 121 is located between the corresponding target terminal and the corresponding preset sidewall 111 along the first direction X. Thus, the liquid injection channel 121 is relatively closer to the preset sidewall 111 than the target terminal, which is beneficial for the electrolyte to flow from between the electrode assembly 2 and the preset sidewall 111 to the bottom of the electrode assembly 2 as much as possible, reducing the accumulation of the electrolyte at the top of the electrode assembly 2. Along the first direction X, taking the approximate middle position of the electrode assembly 2 as the demarcation line, a part of the electrode assembly 2 close to the preset sidewall 111 is the end facing the corresponding preset sidewall 111. Along the first direction X, the position between the electrode assembly 2 and the preset sidewall is also where the electrode assembly 2 faces the corresponding preset sidewall 111.

[0138] For example Figure 4 in the shown orientation, the preset sidewall 111 is located at the right end of the electrode assembly. The right half of the electrode assembly 2 is the part of the electrode assembly close to the preset sidewall 111. Of course, along the first direction X, when the space in the outer shell 1 is sufficient or enough, along the first direction X, the liquid injection channel 121 can be as close as possible to the preset sidewall 111. Thus, more or even all of the electrolyte can flow into the space between the electrode assembly 2 and the preset sidewall 111.

[0139] Exemplarily, please refer to Figure 4 , along the first direction X, the end of the electrode assembly 2 facing the preset sidewall 111 is the right end of the electrode assembly 2, and the target terminal is located at the right end of the electrode assembly 2. In a specific embodiment, the liquid injection channel 121 can be a group. For example Figure 4 in the shown orientation, the liquid injection channel 121 is located at the right end of the electrode assembly 2, the target terminal is located in the right half of the electrode assembly, and all the target terminals corresponding to the liquid injection channel 121 are located at the end of the liquid injection channel 121 facing away from the preset sidewall 111.

[0140] There may be multiple injection channels 121, for example, two, and the preset sidewalls 111 may be one or two. When there is one preset sidewall 111, the two injection channels 121 correspond to the same preset sidewall 111; when there are two preset sidewalls 111, the two injection channels 121 may correspond to different preset sidewalls 111, respectively, and the two preset sidewalls 111 may be shell walls located at both ends of the electrode assembly 2 along the first direction X, respectively. Of course, the two injection channels 121 may also correspond to the same preset sidewall 111. There may also be more than two injection channels 121, which will not be described in detail here.

[0141] The injection channel 121 is arranged between the target terminal and the preset side wall 111 along the first direction X, so that the injection channel 121 is closer to the preset side wall 111 relative to the target terminal, which is beneficial for the electrolyte to flow from between the electrode assembly 2 and the preset side wall 111 to the bottom of the electrode assembly 2 as much as possible, reducing the accumulation of electrolyte at the top of the electrode assembly 2. The electrolyte flows to one end of the preset side wall 111 as much as possible, which to a certain extent suppresses the flow path of the electrolyte from the surrounding to the middle, thereby reducing the probability of liquid sealing of the electrode assembly 2, improving the electrolyte wetting performance of the middle part of the electrode assembly 2 during the static state of the battery cell 10, and improving the wetting effect of the electrolyte on the electrode assembly, thereby improving the overall performance of the battery cell.

[0142] In some embodiments, Figure 3 and Figure 4 or Figure 8 and Figure 9 As shown, the electrode terminal 4 is located at the same end of the electrode assembly 2 along the arrangement direction of the electrode assembly 2 and the end cap assembly 12, and the electrode terminal 4 is provided at both opposite ends of the electrode assembly 2 along the first direction. Among the electrode terminals 4 at both ends, the polarity of the electrode terminal 4 at one end is positive, and the polarity of the electrode terminal 4 at the other end is negative.

[0143] For example, Figure 4 In the orientation shown, one end of the electrode assembly 2 along the arrangement direction of the electrode assembly 2 and the end cover assembly 12 refers to the upper end or the lower end of the electrode assembly 2 .

[0144] For example, Figure 4 In the orientation shown, the electrode terminals are all located at the upper end of the electrode assembly, so that the electrode terminals are located at the same end of the electrode assembly along the arrangement direction of the electrode assembly and the end cover assembly.

[0145] For example, Figure 4 In the illustrated orientation, the two opposite ends of the electrode assembly 2 along the first direction X refer to the left end and the right end of the electrode assembly 2. Of the two end electrode terminals 4, one electrode terminal may be located at the left end of the electrode assembly 2, and the other electrode terminal may be located at the right end of the electrode assembly 2.

[0146] In some embodiments, the electrode terminal 4 may be multiple, for example, the electrode terminal 4 may be two electrode terminals 4 with opposite polarities, and along the arrangement direction of the electrode assembly 2 and the end cap assembly 12, the electrode terminals 4 with opposite polarities are located at the same end of the electrode assembly 2. Along the first direction X, the electrode terminals 4 are located at opposite ends of the electrode assembly 2, for example Figure 4 In the orientation shown, one electrode terminal 4 is located at the left end of the electrode assembly 2, and the other electrode terminal 4 is located at the right end of the electrode assembly 2, wherein the electrode terminal 4 closest to the preset side wall 111 along the first direction X is the target terminal.

[0147] Electrode terminals 4 are provided at both opposite ends of the electrode assembly 2 along the first direction X. Therefore, the distance between the two electrode terminals 4 along the first direction X is farther, so that the target terminal of the two electrode terminals 4 is closer to the preset side wall 111 along the first direction X, and thus the injection channel 121 is closer to the preset side wall 111, which is more conducive to the electrolyte flowing from between the electrode assembly 2 and the preset side wall 111 to the bottom of the electrode assembly 2 as much as possible, further reducing the accumulation of electrolyte at the top of the electrode assembly 2, reducing the probability of liquid sealing of the electrode assembly 2, and improving the wetting effect of the electrolyte on the electrode assembly 2, thereby improving the overall performance of the battery cell 10.

[0148] In some embodiments, Figure 8 and Figure 9 As shown, the electrode assembly 2 is spaced apart from the preset side wall 111, and the liquid outlet 121b is at least partially located between the electrode assembly 2 and the corresponding preset side wall 111 along the first direction X; or, as shown Figure 4 and Figure 5 As shown, the distance between the limit position of the liquid outlet 121b away from the preset side wall 111 along the first direction X and the limit position of the electrode assembly 2 toward the preset side wall 111 along the first direction X is less than or equal to 1 cm and greater than or equal to 0 cm. In some embodiments, along the first direction X, the liquid outlet 121b can be partially or completely located between the electrode assembly 2 and the corresponding preset side wall 111. As a result, it is beneficial for the electrolyte to flow directly between the electrode assembly and the corresponding preset side wall after flowing out of the liquid outlet, further reducing the accumulation of the electrolyte at the top of the electrode assembly, further reducing the probability of liquid sealing of the electrode assembly, and improving the infiltration effect of the electrolyte on the electrode assembly.

[0149] In some embodiments, along the arrangement direction of the end cap assembly and the electrode assembly, the projection area of ​​the liquid outlet 121 b is at least partially located within the projection area of ​​the gap between the electrode assembly 2 and the preset side wall 111 .

[0150] In some embodiments, along the first direction X, the distance between the extreme position where the liquid outlet 121b faces away from the preset sidewall 111 and the extreme position where the electrode assembly 2 faces the preset sidewall 111 is in the range of 0 cm to 1 cm.

[0151] Along the first direction X, the extreme position where the liquid outlet 121b faces away from the preset sidewall 111 means the position where the liquid outlet is farthest from the preset sidewall 111 along the first direction X.

[0152] Exemplarily, taking Figure 5 the shown orientation as an example, the extreme position where the liquid outlet 121b faces away from the preset sidewall 111 refers to the leftmost end of the liquid outlet 121b.

[0153] Along the first direction X, the extreme position where the electrode assembly 2 faces the preset sidewall 111 means the position where the electrode assembly 2 is closest to the preset sidewall 111 along the first direction X.

[0154] Exemplarily, taking Figure 5 the shown orientation as an example, the extreme position where the electrode assembly 2 faces the preset sidewall 111 refers to the rightmost end of the electrode assembly 2.

[0155] Exemplarily, taking Figure 5 the shown orientation as an example, the distance between the leftmost end of the liquid outlet 121b and the rightmost end of the electrode assembly 2 is in the range of 0 cm to 1 cm. Thus, the liquid outlet 121b can be made to approach the preset sidewall 111 as much as possible along the first direction X, which is more conducive to the electrolyte flowing to between the electrode assembly and the corresponding preset sidewall, further reducing the accumulation of the electrolyte on top of the electrode assembly, further reducing the probability of liquid sealing occurring in the electrode assembly, and improving the wetting effect of the electrolyte on the electrode assembly.

[0156] In some embodiments, the distance between the extreme position where the liquid outlet 121b faces away from the preset sidewall 111 and the extreme position where the electrode assembly 2 faces the preset sidewall 111 can be 0 cm, 0.1 cm, 0.2 cm, 0.4 cm, 0.6 cm, 0.8 cm, 0.9 cm, 1 cm, etc., or can also be a value between any two of the above values.

[0157] In some embodiments, the liquid outlet 121b is located between the electrode assembly 2 and the corresponding preset sidewall 111 along the first direction X. That is, the entire liquid outlet 121b is located between the electrode assembly 2 and the corresponding preset sidewall 111 along the first direction X.

[0158] Along the arrangement direction of the end cap assembly and the electrode assembly, the projection area of the liquid outlet 121b is entirely within the projection area of the gap between the electrode assembly 2 and the preset sidewall 111.

[0159] Since the liquid outlet 121b is located between the electrode assembly 2 and the corresponding preset side wall 111 along the first direction X, almost all of the electrolyte can flow directly between the electrode assembly 2 and the corresponding preset side wall 111 after flowing out of the liquid outlet 121b, reducing the accumulation of the electrolyte on the top of the electrode assembly 2, decreasing the probability of the electrode assembly 2 being liquid-sealed, and improving the wetting effect of the electrolyte on the electrode assembly 2.

[0160] In some embodiments, such as Figure 3 and Figure 4 or Figure 8 and Figure 9 as shown, the electrode assembly 2 and the preset side wall 111 are arranged at intervals.

[0161] Since the electrode assembly 2 and the preset side wall 111 are arranged at intervals, the channel between the electrode assembly 2 and the preset side wall 111 is relatively large, and the electrolyte can flow directly from one end of the electrode assembly 2 facing the end cap assembly 12 to the other end of the electrode assembly facing away from the end cap assembly, reducing the accumulation of the electrolyte at one end of the electrode assembly along the first direction close to the preset side wall, decreasing the probability of the electrode assembly being liquid-sealed, and improving the wetting effect of the electrolyte on the electrode assembly 2.

[0162] In some embodiments, such as Figures 4 to 9 as shown, the end cap assembly 12 includes a main end cap 122 and a flow guide member 123. The main end cap 122 covers the opening, and the liquid inlet 121a is formed on the main end cap 122. The flow guide member 123 is connected to the main end cap 122, at least part of the flow guide member 123 is located inside the housing 1, the liquid outlet 121b is formed on the flow guide member 123, and the liquid injection flow channel 121 straddles the main end cap 122 and the flow guide member 123.

[0163] Such as Figures 3 to 5 or Figures 7 to 9 as shown, the end cap assembly 12 includes a main end cap 122 and a flow guide member 123. The main end cap 122 can cover the opening. The flow guide member 123 guides the electrolyte flowing out of the part of the liquid injection flow channel 121 located on the main end cap 122. The flow guide member 123 can be partially or entirely located inside the housing 1, and the flow guide member 123 is connected to the main end cap 122. Among them, the flow guide member 123 can be tubular or grooved. The flow guide member 123 and the main end cap 122 can be directly connected or indirectly connected, and the flow guide member 123 and the main end cap 122 can be of a split structure or an integral structure.

[0164] The liquid injection flow channel 121 straddles the main end cover 122 and the flow guiding member 123. That is, a part of the liquid injection flow channel 121 is formed in the main end cover 122, and another part of the liquid injection flow channel 121 is formed in the flow guiding member 123. The liquid injection flow channel 121 located in the main end cover 122 is communicated with the liquid injection flow channel 121 located in the flow guiding member 123. The liquid inlet 121a refers to the liquid inlet opening of the liquid injection flow channel 121 located in the main end cover 122, and the liquid outlet 121b refers to the liquid injection outlet of the liquid injection flow channel 121 located in the flow guiding member 123. That is, the electrolyte flows in from the liquid inlet 121a of the liquid injection flow channel 121 located in the main end cover 122, flows through the part of the liquid injection flow channel 121 located in the main end cover 122, then flows through the part of the liquid injection flow channel 121 located in the flow guiding member 123, and finally flows out from the liquid outlet 121b. In a specific embodiment, the cross-section of the liquid injection flow channel 121 can be circular, and the inner diameter of the part of the liquid injection flow channel located in the main end cover 122 can be the same as or different from the inner diameter of the part of the liquid injection flow channel 121 located in the flow guiding member 123.

[0165] Optionally, the flow guiding member 123 can be made of a corrosion-resistant material such as polyurethane, polyvinylidene fluoride or polyamide.

[0166] Since the liquid injection flow channel 121 straddles the main end cover 122 and the flow guiding member 123, during the liquid injection process, the flow guiding member 123 can divert more electrolyte between the electrode assembly 2 and the corresponding preset side wall 111, so that more electrolyte flows between the electrode assembly 2 and the corresponding preset side wall 111, reducing the accumulation of electrolyte on the top of the electrode assembly 2 and reducing the probability of liquid sealing of the electrode assembly 2. Along the arrangement direction of the end cover assembly 12 and the electrode assembly 2, more electrolyte infiltrates from the end of the electrode assembly 2 away from the end cover assembly 12 to the end of the electrode assembly 2 close to the end cover assembly 12, further improving the electrolyte infiltration performance in the middle of the electrode assembly 2 during the static process of the battery cell 10, and thus improving the overall performance of the battery cell 10.

[0167] In some embodiments, as Figure 4 shown, the liquid outlet 121b is located at one end of the flow guiding member 123 facing the corresponding preset side wall 111 along the first direction X.

[0168] When there is one liquid outlet 121b, along the first direction X, the side wall of the opposite ends of the housing 11 that is closer to the liquid outlet 121b is the preset side wall 111. When there are multiple liquid outlets 121b, along the first direction X, the side wall of the opposite ends of the housing 11 that is closer to the liquid outlet 121b is the preset side wall 111 corresponding to the liquid outlet 121b.

[0169] Since the liquid outlet 121b is located at one end of the guide member 123 along the first direction X toward the corresponding preset side wall 111, more electrolyte can flow into between the electrode assembly 2 and the corresponding preset side wall 111, reducing the accumulation of electrolyte at the top of the electrode assembly, reducing the probability of liquid sealing in the electrode assembly, and further improving the electrolyte wetting performance of the middle part of the electrode assembly 2 when the battery cell 10 is stationary, thereby improving the overall performance of the battery cell 10.

[0170] In some embodiments, Figure 4 As shown, along the arrangement direction of the main end cover 122 and the electrode assembly 2, the guide member 123 is spaced apart from the electrode assembly 2.

[0171] The arrangement direction of the main end cover 122 and the electrode assembly 2 is arranged along the third direction Z. Along the third direction Z, the guide member 123 and the electrode assembly 2 are spaced apart. The spacing distance is not specifically limited in this application and can be reasonably set according to the distance between the main end cover 122 and the electrode assembly 2 and the required size of the guide member 123.

[0172] Therefore, the spacing between the guide member 123 and the electrode assembly 2 can reduce the probability of the guide member 123 contacting the electrode assembly 2 and reduce the probability of the guide member 123 damaging or destroying the electrode assembly 2.

[0173] In some embodiments, Figure 5 and Figure 6 As shown, the flow guide 123 includes a flow guide side wall 1231 and a bottom wall 1232. The flow guide side wall 1231 includes a first flow guide side wall 12311 connected to the main end cover 122, and the first flow guide side wall 12311 is arranged opposite to the corresponding preset side wall 111 along the first direction X. The bottom wall 1232 is connected to an end of the first flow guide side wall 12311 away from the main end cover 122 along the arrangement direction of the main end cover 122 and the electrode assembly 2, and the bottom wall 1232 is at least partially located between the first flow guide side wall 12311 and the corresponding preset side wall 111 along the first direction X.

[0174] For example, Figure 6 In the orientation shown, the bottom wall 1232 is connected to the lower end of the first guide side wall 12311.

[0175] like Figure 5 As shown, the guide member 123 includes a guide side wall 1231 and a bottom wall 1232 connected to each other, wherein the guide side wall 1231 includes a first guide side wall 12311, and the first guide side wall 12311 connects the main end cover 122 and the bottom wall 1232, and along the third direction Z, the main end cover 122 and the bottom wall 1232 are respectively connected to the opposite ends of the first guide side wall 12311. The main end cover 122 can be connected to the end portion or a portion close to the end portion of the first guide side wall 12311 along the third direction Z, for exampleFigure 5 As shown, the main end cap 122 can be connected to the upper end or a part near the upper end of the first diversion side wall 12311. The main end cap 122 and the first diversion side wall 12311 can be an integral structure or can be bonded by structural adhesive or the like; the bottom wall 1232 can be connected to the other end or a part near the other end of the first diversion side wall 12311 along the third direction Z. For example Figure 5 As shown, the bottom wall 1232 can be connected to the lower end or a part near the lower end of the first diversion side wall 12311. The bottom wall 1232 and the first diversion side wall 12311 can be an integral structure or can be bonded by structural adhesive or the like.

[0176] In some embodiments, as Figure 9 shown, the first diversion side wall 12311 and the corresponding preset side wall 111 are arranged along the first direction X. Along the first direction X, part or all of the bottom wall 1232 is located between the first diversion side wall 12311 and the corresponding preset side wall 111. For example, along the first direction X, one end of the bottom wall 1232 far from the preset side wall 111 is connected to the first diversion side wall 12311. For example Figure 5 or Figure 9 as shown, the left end of the bottom wall 1232 is connected to the first diversion side wall 12311; or, along the first direction X, one end of the bottom wall 1232 far from the preset side wall 111 extends beyond the first diversion side wall 12311. For example Figure 5 or Figure 9 as shown, the left end of the bottom wall 1232 extends beyond the first diversion side wall 12311.

[0177] Optionally, the diversion side wall 1231 can be plate-shaped. The diversion side wall 1231 can be flat or can be plate-shaped with a curved surface. The diversion side wall 1231 can also have a second diversion side wall 12312 connected to the first diversion side wall 12311 and the bottom wall 1232. The shapes or sizes of the first diversion side wall 12311 and the second diversion side wall 12312 can be the same or different. Of course, the diversion side wall 1231 can also be of other shapes.

[0178] Optionally, the bottom wall 1232 can be plate-shaped. The bottom wall 1232 can be flat or can be plate-shaped with a curved surface. For example, the bottom wall 1232 can be in a groove shape that is partially recessed in the direction approaching the electrode assembly 2 along the first direction X. Of course, the bottom wall 1232 can also be of other shapes.

[0179] Since the diversion member 123 includes the structure of the diversion side wall 1231 and the bottom wall 1232, more electrolyte can flow between the electrode assembly 2 and the corresponding preset side wall 111 under the guidance of the diversion side wall 1231 and the bottom wall 1232, thereby further improving the wetting performance of the electrolyte of the electrode assembly 2 and enhancing the performance of the battery cell 10.

[0180] In some embodiments, such as Figure 5 and Figure 6 shown, the diversion side wall 1231 further includes a second diversion side wall 12312. The second diversion side wall 12312 is at least partially located between the bottom wall 1232 and the main end cap 122 along the arrangement direction of the main end cap 122 and the electrode assembly 2. The second diversion side wall 12312 is respectively connected to the first diversion side wall 12311 and the bottom wall 1232. Second diversion side walls 12312 are provided at both opposite ends of the bottom wall 1232 along the second direction Y. The second direction Y intersects with the first direction X and the arrangement direction of the main end cap 122 and the electrode assembly 2 respectively.

[0181] Exemplarily, as Figure 6 shown in the orientation, second diversion side walls 12312 are provided at the left end and the right end of the bottom wall 1232.

[0182] The arrangement direction of the main end cap 122 and the electrode assembly 2 is arranged along the third direction Z. Along the third direction Z, the second diversion side wall 12312 is partially or entirely located between the bottom wall 1232 and the main end cap 122. Optionally, along the third direction Z, one end of the second diversion side wall 12312 close to the main end cap 122 may be connected to the main end cap 122 or there may be a gap between it and the main end cap 122, and the other end of the second diversion side wall 12312 or a part close to its other end is connected to the bottom wall 1232.

[0183] One end of the second diversion side wall 12312 along the first direction X is connected to the first diversion side wall 12311. Among them, one end of the second diversion side wall 12312 along the first direction X away from the preset side wall 111 may extend beyond or not extend beyond the first diversion side wall 12311.

[0184] Along the second direction Y, second diversion side walls 12312 are provided at both opposite ends of the bottom wall 1232. Of course, along the second direction Y, second diversion side walls 12312 may not be provided at both opposite ends of the bottom wall 1232, or along the second direction Y, second diversion side walls 12312 may be provided at one end of the bottom wall 1232.

[0185] The diversion side wall 1231 further includes a second diversion side wall 12312. The second diversion side wall 12312 is located at both opposite ends of the bottom wall 1232 along the second direction Y. The second diversion side wall 12312 can prevent the electrolyte from flowing out from both ends of the bottom wall 1232 along the second direction Y, so that the electrolyte flows out from the liquid outlet of the diversion member 123 facing the preset side wall 111, so that more electrolyte can further flow between the electrode assembly 2 and the corresponding preset side wall 111, thereby improving the wetting performance of the electrode assembly 2 and improving the performance of the battery cell 10.

[0186] In some embodiments, such asFigure 5 or Figure 9 As shown, the distance between the bottom wall 1232 and the main end cap 122 along the arrangement direction of the main end cap 122 and the electrode assembly 2 is a preset distance L, and the preset distance L gradually increases along the direction from the first diversion side wall 12311 to the corresponding preset side wall 111.

[0187] Along the third direction Z, the distance between the bottom wall 1232 and the main end cap 122 is the preset distance L. The preset distance L refers to the distance between the surface of the bottom wall 1232 that intersects with the third direction Z and approaches the main end cap 122 along the third direction Z, and the surface of the main end cap 122 that intersects with the third direction Z and approaches the bottom wall 1232 along the third direction Z. For example Figure 5 As shown, the preset distance L refers to the distance between the lower surface of the bottom wall 1232 and the upper surface of the main end cap 122. Along the direction from the first diversion side wall 12311 to the corresponding preset side wall 111, the preset distance gradually increases. That is, as Figure 5 shown, along the first direction X, the closer the bottom wall 1232 is to the preset side wall 111, the farther it is from the main end cap 122.

[0188] In a specific embodiment, as Figure 5 shown, both the first diversion side wall 12311 and the bottom wall 1232 are flat. In the projection area along the second direction Y, the angle formed between the projection of the first diversion side wall 12311 and the projection of the bottom wall 1232 is greater than 90 degrees.

[0189] Since the preset distance L gradually increases along the direction from the first diversion side wall 12311 to the corresponding preset side wall 111, therefore, the bottom wall 1232 can be inclined. This can not only accelerate the rate of electrolyte flowing into the space between the electrode assembly 2 and the corresponding preset side wall 111, speed up the liquid injection speed, and thus improve the production rate of the battery cell 10; but also reduce the probability of electrolyte remaining on the bottom wall 1232, reduce the probability of electrolyte waste, and save costs.

[0190] In some embodiments, as Figure 5 or Figure 9 shown, the liquid injection flow channel 121 includes a main flow channel 1211 and a guiding flow channel 1212 that are interconnected. The main flow channel is formed in the main end cap 122, the guiding flow channel 1212 is formed in the diversion member 123. The liquid inlet 121a is located at one end of the main flow channel 1211 away from the diversion member 123. The opening at one end of the main flow channel 1211 away from the liquid inlet 121a is a transition port 1211a, and the transition port 1211a is located between the first diversion side wall 12311 and the corresponding preset side wall 111 along the first direction X.

[0191] The injection channel 121 includes a main channel 1211 and a guide channel 1212 that are interconnected. The main channel 1211 is formed on the main end cover 122. Along the third direction Z, the liquid inlet 121a is located at the end of the main channel 1211 away from the guide member 123, and the transition port 1211a is located at the end of the main channel 1211 away from the liquid inlet 121a. The guide channel 1212 is formed on the guide member 123, and the guide channel 1212 is connected to the main channel 1211 through the transition port 1211a. The electrolyte flowing through the main channel 1211 flows to the transition port 1211a and flows into the guide channel 1212. Along the first direction X, the transition port 1211a is located between the first guide side wall 12311 and the corresponding preset side wall 111, thereby, the electrolyte in the main channel 1211 can almost all flow to the guide channel 1212 through the transition port 1211a. The present application does not impose any specific limitation on the size and shape of the transition opening 1211 a , as long as the electrolyte can flow from the main channel 1211 into the guide channel 1212 .

[0192] For example, Figure 5 or Figure 9 In the orientation shown, the liquid inlet 121 a is located at the upper end of the main channel 1211 , and the transition port 1211 a is located at the lower end of the main channel 1211 .

[0193] Since the injection channel includes a main channel and a guide channel that are interconnected, the electrolyte flowing in from the liquid inlet 121a can flow to the guide channel 1212 via the transition port 1211a of the main channel. Moreover, since the transition port 1211a is located between the first flow guide side wall 12311 and the corresponding preset side wall 111 along the first direction X, the electrolyte flowing out from the transition port 1211a can all flow to the guide channel 1212, so that most of the electrolyte flows between the electrode assembly 2 and the preset side wall 111, thereby improving the wetting performance of the electrode assembly 2 and improving the performance of the battery cell 10.

[0194] In some embodiments, along the first direction X, the transition opening 1211 a may be partially located between the first flow guiding side wall 12311 and the corresponding preset side wall 111 .

[0195] In some embodiments, Figures 4 to 6 As shown, the guide member 123 is located inside the housing 1 .

[0196] The guide member 123 is entirely located in the housing 1. For example, the guide member 123 may be connected to one end of the main end cover 122 located in the housing 1. Figure 5 or Figure 9 In the orientation shown, the guide member 123 can be connected to the lower end of the main end cover 122.

[0197] Thus, the flow guide member 123 is located inside the housing 1, such that along the arrangement direction of the end cover assembly 12 and the electrode assembly 2, the end of the flow guide member 123 away from the electrode assembly 2 does not extend beyond the end of the end cover assembly 12 away from the electrode assembly 2, which is beneficial for more easily sealing the liquid injection channel 121 after the liquid injection is completed.

[0198] In some embodiments, as Figures 4 to 6 shown, the main end cover 122 includes an end cover body 1221 and an insulating member 1222 mounted on one end of the end cover body 1221 facing the electrode assembly 2, and the flow guide member 123 is integrally formed with the insulating member 1222.

[0199] The main end cover 122 includes an end cover body 1221 and an insulating member 1222. The insulating member 1222 is located between the end cover body 1221 and the electrode assembly 2. The insulating member 1222 can insulate between the electrode assembly 2 and the end cover body 1221, and thus insulate between the electrode assembly 2 and the end cover assembly 12.

[0200] Exemplarily, as Figure 5 or Figure 9 shown in the orientation, the insulating member 1222 is located at the lower end of the end cover body 1221.

[0201] The insulating member 1222 can be made of an insulating material, such as insulating resin. The flow guide member 123 is integrally formed with the insulating member 1222, and the materials of the flow guide member 123 and the insulating member 1222 can be the same or different.

[0202] Since the flow guide member and the insulating member are integrally formed, it is beneficial to reduce the number of components and improve the manufacturing efficiency.

[0203] In some embodiments, the flow guide member 123 and the insulating member 1222 can be a split structure.

[0204] In some embodiments, the end cover assembly 12 further includes a stop platform 124 connected to one end of the main end cover 122 facing the electrode assembly 2. The stop platform 124 has an avoidance hole 1241. The projection area of the avoidance hole 1241 along the first direction X is the first projection area, and the projection area of the flow guide member 123 along the first direction X is the second projection area. The first projection area spans across opposite ends of the second projection area along the second direction Y. Along the arrangement direction of the end cover assembly and the electrode assembly, at least part of the second projection area overlaps with the first projection area.

[0205] Exemplarily, as Figure 5 or Figure 9 shown in the orientation, the stop platform 124 is connected to the right end of the main end cover 122.

[0206] Exemplarily, as Figure 6As shown in the orientation, the left and right ends of the first projection area straddle the left and right ends of the second projection area. The end cap assembly 12 further includes a stop platform 124, and the stop platform 124 is connected to one end of the main end cap 122 facing the electrode assembly 2. The stop platform 124 and the main end cap 122 can be indirectly or directly connected. Further, the main end cap 122 includes an insulating member 1222, and the stop platform 124 is connected to one end of the insulating member 1222 facing the electrode assembly 2. The stop platform 124 and the insulating member 1222 can be directly or indirectly connected. For example, the stop platform 124 and the insulating member 1222 are integrally formed.

[0207] In some embodiments, the stop platform 124 can be located at at least one end of the main end cap 122 along the first direction X. The stop platform 124 can play a positioning role, which can not only prevent the electrode assembly 2 from moving in the third direction Z, but also facilitate the covering of the end cap assembly 12 and the housing 11.

[0208] In some embodiments, along the first direction X, the stop platform 124 is located between the liquid injection flow channel 121 and the preset side wall 111.

[0209] The stop platform 124 has an avoidance hole 1241. For example Figure 6 As shown, the two ends of the flow guiding member 123 along the second direction Y do not extend beyond the two ends of the avoidance hole 1241 along the second direction Y. In a specific embodiment, the avoidance hole 1241 can be formed by a part of the stop platform 124 recessed at one end along the third direction Z and close to the main end cap 122. Along the second direction Y, the two ends of the liquid outlet 121b do not extend beyond the two ends of the avoidance hole 1241. Along the third direction Z, at least a part of the liquid outlet 121b overlaps with the avoidance hole 1241. Thus, the electrolyte flowing out from the liquid outlet 121b can flow through the avoidance hole 1241 and into the space between the electrode assembly 2 and the preset side wall 111.

[0210] This application does not specifically limit the shape and size of the avoidance hole 1241. The avoidance hole 1241 can be a hole formed by the stop platform 124 or a groove formed by a partial depression of the stop platform 124, as long as it can avoid at least part of the electrolyte flowing from the liquid outlet 121b to the space between the electrode assembly 2 and the preset side wall 111.

[0211] Since the end cap assembly 12 includes the stop platform 124, the stop platform 124 can position the electrode assembly 2 along the arrangement direction of the end cap assembly 12 and the electrode assembly 2. Since the stop platform 124 has the avoidance hole 1241, during the liquid injection process, the stop platform 124 can avoid at least part of the electrolyte, so that more and faster electrolyte can flow into the space between the electrode assembly 2 and the corresponding preset side wall 111, thereby further improving the wetting performance of the electrode assembly 2 and the performance of the battery cell 10.

[0212] In some embodiments, such asFigure 10 and Figure 11 As shown in Figure 11 , the electrode assembly 2 has a flat region 25. The electrode assembly 2 includes a positive electrode tab 22 and a negative electrode tab 23. The portion of the positive electrode tab 22 located in the flat region 25 and the portion of the negative electrode tab 23 located in the flat region 25 are stacked along the second direction Y. The second direction Y intersects with the first direction X and the arrangement direction of the end cap assembly 12 and the electrode assembly 2 respectively.

[0213] In some embodiments, as Figure 10 shown in Figure 10 , the electrode assembly 2 is a wound structure. The electrode assembly 2 further has a corner region 26. The corner region 26 is provided at at least one end of the flat region 25 along the first direction X. Further, the corner regions 26 are provided at both ends of the flat region 25 along the first direction X.

[0214] Exemplarily, for example Figure 10 in the shown orientation, the corner region 26 is provided at the left end and / or the right end of the flat region 25.

[0215] In some embodiments, as Figure 11 shown in Figure 11 , the electrode assembly 2 is a laminated structure. The flat region 25 is provided with a plurality of positive electrode tabs 22 and a plurality of negative electrode tabs 23. The plurality of positive electrode tabs 22 and the plurality of negative electrode tabs 23 are stacked along the second direction Y.

[0216] In some embodiments, the preset side wall 111 is the side wall of the housing 11 with the smallest outer surface area.

[0217] Since the portion of the positive electrode tab located in the flat region and the portion of the negative electrode tab located in the flat region are stacked along the second direction, the electrolyte can flow between the electrode assembly 2 and the preset side wall 111 along the first direction X, reducing the probability that the electrolyte can hardly flow between the electrode assembly 2 and the side wall of the battery cell 10 due to the heat collision of the battery cell 10. Specifically, if the preset side wall is the side wall intersecting with the second direction Y, when the battery cell 10 expands due to heat, at least a part of the electrode assembly 2 located in the flat region 25 may bulge along the second direction Y and towards the above-mentioned side wall, which will cause the distance between the electrode assembly 2 and the above-mentioned side wall to decrease or even be zero, thus affecting the electrolyte flow.

[0218] In some embodiments, as Figure 3 and Figure 4 or Figure 7 and Figure 8 shown in Figure 3 and Figure 4 or Figure 7 and Figure 8 , the end cap assembly 12 further has an exhaust port 125 spaced from the liquid inlet 121a. The exhaust port 125 is communicated with the space inside the housing 1. The arrangement direction of the exhaust port 125 and the liquid inlet 121a and the arrangement direction of the end cap assembly 12 and the electrode assembly 2 intersect.

[0219] The end cap assembly 12 further has an exhaust port 125 which communicates the space inside and outside the outer shell 1. The exhaust port 125 can discharge the gas inside the outer shell 1 to the outside of the outer shell 1. During the liquid injection process, the gas inside the outer shell 1 can be discharged through the exhaust port 125, which is beneficial to the electrolyte soaking the electrode assembly 2.

[0220] In some embodiments, the liquid inlet 121a and the exhaust port 125 may be arranged at intervals along the first direction X and / or the second direction Y. The present application does not specifically limit the distance between the liquid inlet 121a and the exhaust port 125, and the distance between the liquid inlet 121a and the exhaust port 125 can be increased as much as possible.

[0221] Exemplarily, as Figure 8 shown in the orientation, the liquid inlet 121a and the exhaust port 125 are respectively located at the left end and the right end of the end cap assembly 12.

[0222] The present application does not specifically limit the shape and size of the exhaust port 125, as long as it can discharge the gas inside the outer shell 1 to the outside of the outer shell 1. The shape and / or size of the exhaust port 125 and the liquid inlet 121a may be the same or different. For example, the inner diameter dimension of the exhaust port 125 may be in the range of 2 mm to 3 mm.

[0223] In some embodiments, the exhaust port 125 may be communicated with an air extraction device located outside the outer shell 1. The air extraction device is used to extract the gas inside the outer shell 1, which is beneficial to the electrolyte soaking the electrode assembly 2. Of course, the exhaust port 125 may also not be communicated with the air extraction device.

[0224] Since the end cap assembly 12 has the exhaust port 125, during the liquid injection process of the electrolyte, the gas inside the outer shell 1 can escape through the exhaust port 125, which can not only improve the liquid injection speed of the electrolyte, but also be beneficial to improving the soaking performance of the electrolyte of the electrode assembly 2.

[0225] In some embodiments, such as Figure 3 and Figure 4 or Figure 7 and Figure 8 shown, along the first direction X, the liquid inlet 121a is located at one end of the end cap assembly 12 along the first direction X, and the exhaust port 125 is located at the other end of the end cap assembly 12 along the first direction X.

[0226] Along the first direction X, the liquid inlet 121a and the exhaust port 125 are respectively located at both ends of the end cap assembly 12.

[0227] Since the liquid inlet is located at one end of the end cap assembly along the first direction, and the exhaust port is located at the other end of the end cap assembly along the first direction, the distance between the liquid inlet and the exhaust port along the first direction is relatively long. Therefore, it is more conducive to the discharge of the gas in the housing 1 during the liquid injection process, and it is also conducive to reducing the probability of an event where, when liquid injection and air extraction are carried out simultaneously, due to the low pressure at the exhaust port 125, the electrolyte near the liquid outlet 121b is affected or even the electrolyte near the liquid outlet 121b is sucked to the exhaust port 125.

[0228] In some embodiments, the battery cell 10 includes a seal (not shown), the seal closes the liquid injection flow channel 121, and the seal is fixedly connected to the end cap assembly 12.

[0229] The seal closes the liquid injection flow channel 121, and the seal can be non-removably connected to the end cap assembly 12, or the seal can also be removably connected to the end cap assembly 12. For example, the seal can be a seal nail or a seal bolt, etc. The material of the seal can be rubber or silicone material, etc.

[0230] In some embodiments, the outer contour of the seal (not shown) can be similar to the outer contour of the liquid inlet 121a, and the liquid inlet 121a can be blocked by the seal, and then the gap between the seal and the end cap assembly 12 can be sealed. For example, the gap between the seal and the end cap assembly 12 can be sealed by welding.

[0231] In some embodiments, the battery cell 10 further includes a plugging member (not shown), the plugging member closes the exhaust port 125, and the plugging member can be fixedly connected to the end cap assembly 12.

[0232] Thus, the seal can close the liquid injection flow channel 121, reduce the probability of the electrolyte flowing out of the housing 1, and improve the overall performance of the battery cell.

[0233] In some embodiments, the end cap assembly 12 includes a main end cap 122, the main end cap 122 covers the opening, and the liquid inlet 121a and the liquid outlet 121b are both formed on the main end cap 122. At least a part of the liquid outlet 121b along the first direction X is located between the electrode assembly 2 and the corresponding preset side wall 111.

[0234] The end cap assembly 12 includes a main end cap 122 covering the opening, the main end cap 122 has a liquid injection flow channel 121 communicating with the space in the housing 1, the liquid inlet 121a and the liquid outlet 121b of the liquid injection flow channel 121 are both formed on the main end cap 122, and along the first direction X, part or all of the liquid outlet 121b is located between the electrode assembly 2 and the corresponding preset side wall 111.

[0235] Since at least a part of the liquid outlet along the first direction is located between the electrode assembly and the corresponding preset side wall, at least a part of the electrolyte can flow out from the liquid outlet 121b and directly flow between the electrode assembly 2 and the corresponding preset side wall 111, improving the electrolyte wetting performance in the middle of the electrode assembly 2 during the stationary process of the battery cell 10, and thus improving the overall performance of the battery cell 10.

[0236] In some embodiments, the shape of the outer shell 1 is square.

[0237] Thereby, the wetting performance of the electrolyte of the battery cell with a square outer shell can be reduced.

[0238] The second aspect of the present application provides a battery device 100, as Figure 2 shown, the battery device 100 includes a plurality of battery cells 10 provided in the first aspect.

[0239] Since the battery device includes the above-mentioned battery cells, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells can be improved, and thus the overall performance of the battery device can be improved.

[0240] The third aspect of the present application provides an energy storage device 2000, Figure 12 which is a schematic structural diagram of the energy storage device provided in some embodiments of the present application. The energy storage device 2000 includes a plurality of battery cells provided in the first aspect or a plurality of battery devices provided in the second aspect. The battery cells or battery devices are used to store or provide electrical energy.

[0241] Since the energy storage device 2000 includes the above-mentioned battery cells or battery devices, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells or the overall performance of the battery devices can be improved, and thus the overall performance of the energy storage device can be improved.

[0242] The fourth aspect of the present application provides an electrical device, as Figure 1 shown, the electrical device includes a battery cell 10 provided in the first aspect, a battery device 100 provided in the second aspect, or an energy storage device provided in the third aspect. The battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0243] Since the electrical device includes the above-mentioned battery cells, battery devices or energy storage devices, the wetting effect of the electrolyte on the electrode assembly can be improved, the overall performance of the battery cells, battery devices or energy storage devices can be improved, and thus the overall performance of the electrical device can be improved.

[0244] In a specific embodiment, for example Figures 3 to 9As shown, a main channel 1211 is formed at one end of the main end cover 122 along the first direction X, and a liquid inlet 121a is located at the end of the main channel 1211 away from the electrode assembly 2. The inner diameter of the liquid inlet 121a is 2 mm. Along the third direction Z, a flow guide 123 is provided at one end of the main end cover 122 close to the electrode assembly 2. The flow guide 123 can be a flow guide groove. The flow guide groove can be made of polyethylene, polystyrene and other materials with insulation, electrolyte corrosion resistance, and light material. Along the first direction X, the two ends of the flow guide 123 do not exceed the two ends of the main end cover 122; along the second direction Y, the two ends of the flow guide 123 do not exceed the two ends of the main end cover 122; along the third direction Z, the flow guide 123 is spaced apart from the electrode assembly 2. The electrolyte flows into the main channel 1211 from the liquid inlet 121a, flows through the guide channel 1212 formed by the guide member 123, and then flows into the space between the electrode assembly 2 and the preset side wall 111, and under the action of gravity, flows into the bottom of the shell 11, thereby the electrolyte begins to infiltrate from the bottom of the electrode assembly 2 from bottom to top, and the gas in the gap between the electrode assembly 2 and the shell 1 as well as the gas in the pole piece and the isolation membrane of the electrode assembly 2 are gradually driven out by the electrolyte, reducing the probability of gas accumulation in the approximate middle part of the electrode assembly 2, thereby reducing the probability of the electrode assembly 2 being difficult to infiltrate with the electrolyte due to gas accumulation.

[0245] In some embodiments, the flow guide 123 includes a flow guide side wall 1231 and a bottom wall 1232, the flow guide side wall 1231 includes a first flow guide side wall 12311 connected to the main end cover 122, and the first flow guide side wall 12311 is arranged opposite to the corresponding preset side wall 111 along the first direction X. The bottom wall 1232 is connected to an end of the first flow guide side wall 12311 away from the main end cover 122 along the arrangement direction of the main end cover 122 and the electrode assembly 2, and the bottom wall 1232 is at least partially located between the first flow guide side wall 12311 and the corresponding preset side wall 111 along the first direction X, and the distance between the bottom wall 1232 and the main end cover 122 along the arrangement direction of the main end cover 122 and the electrode assembly 2 is a preset distance, and the preset distance gradually increases in the direction from the first flow guide side wall 12311 to the corresponding preset side wall 111.

[0246] In some embodiments, the end cap assembly 12 further has an exhaust port 125 with an inner diameter of 2 mm that is spaced apart from the liquid inlet. The exhaust port 125 communicates with the space inside the housing 1. Along the first direction X, the liquid inlet is located at one end of the end cap assembly 12 along the first direction X, and the exhaust port 125 is located at the other end of the end cap assembly 12 along the first direction X. Alternatively, along the first direction X, the liquid injection port is located at one end of the end cap assembly 12 along the first direction X, and the exhaust port 125 is located at a substantially middle position of the end cap assembly 12 along the first direction X. The exhaust port 125 can be connected to a gas extraction device. During the liquid injection process, the gas extraction device can be opened, and the gas extraction device extracts the gas inside the housing 1. Thereby, the exchange rate of the electrolyte and the gas can be accelerated, and the battery cell maintains a negative pressure state to a certain extent. The negative pressure state will accelerate the electrolyte infiltration rate of the electrode assembly 2.

[0247] 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 on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope 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. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery cell, characterized in that: include: The housing comprises a shell having an opening and an end cap assembly covering the opening, wherein the end cap assembly has a liquid injection channel communicating with the space in the housing, the liquid injection channel comprises a liquid inlet and a liquid outlet communicating with each other, and the housing comprises a preset side wall; an electrode assembly, located in the housing, the electrode assembly and the preset side wall are arranged along a first direction, the end cap assembly is arranged to cross the arrangement direction of the electrode assembly and the first direction, and the injection channel is provided at least at one end of the electrode assembly along the first direction; An electrode terminal is electrically connected to the electrode assembly, and the electrode terminal is installed in the shell. The electrode terminal located at one end of the electrode assembly along the first direction toward the injection channel is the target terminal, and the injection channel is located between the corresponding target terminal and the corresponding preset side wall along the first direction.

2. The battery cell according to claim 1, characterized in that: The electrode terminal is located at the same end of the electrode assembly along the arrangement direction of the electrode assembly and the end cover assembly, and the electrode terminals are arranged at the opposite ends of the electrode assembly along the first direction. Among the electrode terminals at both ends, the polarity of the electrode terminal at one end is positive, and the polarity of the electrode terminal at the other end is negative.

3. The battery cell according to claim 1, characterized in that: The electrode assembly is spaced apart from the preset side wall, and the liquid outlet is at least partially located between the electrode assembly and the corresponding preset side wall along the first direction; or, the distance between the extreme position of the liquid outlet along the first direction away from the preset side wall and the extreme position of the electrode assembly along the first direction toward the preset side wall is less than or equal to 1 cm and greater than or equal to 0 cm.

4. The battery cell according to claim 3, characterized in that: The liquid outlet is located between the electrode assembly and the corresponding preset side wall along the first direction.

5. The battery cell according to claim 1, characterized in that: The electrode assembly is spaced apart from the preset side wall.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The end cap assembly comprises: A main end cover, which is provided on the opening, and the liquid inlet is formed on the main end cover; A flow guide is connected to the main end cover, the flow guide is at least partially located in the shell, the liquid outlet is formed in the flow guide, and the injection channel spans the main end cover and the flow guide.

7. The battery cell according to claim 6, characterized in that: The liquid outlet is located at one end of the flow guide member along the first direction toward the corresponding preset side wall.

8. The battery cell according to claim 6, characterized in that: Along the arrangement direction of the main end cover and the electrode assembly, the flow guide member and the electrode assembly are spaced apart.

9. The battery cell according to claim 6, characterized in that: The flow guide comprises: A flow guide side wall, comprising a first flow guide side wall connected to the main end cover, wherein the first flow guide side wall and the corresponding preset side wall are arranged opposite to each other along the first direction; The bottom wall is connected to one end of the first guide side wall away from the main end cover along the arrangement direction of the main end cover and the electrode assembly, and the bottom wall is at least partially located between the first guide side wall and the corresponding preset side wall along the first direction.

10. The battery cell according to claim 9, characterized in that: The guide side wall also includes a second guide side wall, which is at least partially located between the bottom wall and the main end cover along the arrangement direction of the main end cover and the electrode assembly, and the second guide side wall is respectively connected to the first guide side wall and the bottom wall, and the second guide side wall is provided at both opposite ends of the bottom wall along the second direction, and the second direction is respectively arranged to cross the first direction and the arrangement direction of the main end cover and the electrode assembly.

11. The battery cell according to claim 9, characterized in that: The distance between the bottom wall and the main end cover along the arrangement direction of the main end cover and the electrode assembly is a preset distance, and the preset distance gradually increases in a direction from the first guide side wall to the corresponding preset side wall.

12. The battery cell according to claim 9, characterized in that: The injection channel includes a main channel and a guide channel which are interconnected, the main channel is formed on the main end cover, the guide channel is formed on the guide member, the liquid inlet is located at the end of the main channel away from the guide member, the opening of the end of the main channel away from the liquid inlet is a transition port, and the transition port is located between the first guide side wall and the corresponding preset side wall along the first direction.

13. The battery cell according to claim 6, characterized in that: The flow guide is located in the housing.

14. The battery cell according to claim 6, characterized in that: The main end cover comprises an end cover body and an insulating member installed at one end of the end cover body facing the electrode assembly, and the flow guide member and the insulating member are integrally formed.

15. The battery cell according to claim 6, characterized in that: The end cover assembly also includes a stop platform connected to one end of the main end cover facing the electrode assembly, the stop platform has an avoidance hole, the projection area of ​​the avoidance hole along the first direction is the first projection area, the projection area of ​​the guide member along the first direction is the second projection area, the first projection area is spanned at the opposite ends of the second projection area along the second direction, and along the arrangement direction of the end cover assembly and the electrode assembly, at least part of the second projection area overlaps with the first projection area.

16. The battery cell according to any one of claims 1 to 5, characterized in that: The electrode assembly has a straight area, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet. The portion of the positive electrode sheet located in the straight area and the portion of the negative electrode sheet located in the straight area are stacked along a second direction, and the second direction is respectively arranged to intersect with the first direction and the arrangement direction of the end cap assembly and the electrode assembly.

17. The battery cell according to any one of claims 1 to 5, characterized in that: The end cap assembly also has an exhaust port spaced apart from the liquid inlet, the exhaust port is connected to the space in the shell, and the exhaust port is arranged in a direction that intersects with the liquid inlet and the end cap assembly with the electrode assembly.

18. The battery cell according to claim 17, characterized in that: Along the first direction, the liquid inlet is located at one end of the end cover assembly along the first direction, and the exhaust port is located at the other end of the end cover assembly along the first direction.

19. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell comprises a sealing member, which seals the injection channel and is fixedly connected to the end cover assembly.

20. The battery cell according to claim 1, characterized in that The end cap assembly comprises: A main end cover, which is provided on the opening, and the liquid inlet and the liquid outlet are both formed on the main end cover; At least a portion of the liquid outlet along the first direction is located between the electrode assembly and the corresponding preset side wall.

21. The battery cell according to any one of claims 1 to 5, characterized in that: The shape of the shell is square.

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

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

24. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 21, a battery device according to claim 22 or an energy storage device according to claim 23, wherein the battery cell or the battery device is used for storing or providing electrical energy.

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