Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a flow guide part, 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 hole communicated with the space in the shell, 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 electrode assembly and the end cover assembly are arranged in the second direction, and the first direction and the second direction are arranged in a crossed mode. The flow guide piece is arranged in the hole in a penetrating mode and provided with a liquid inlet located in the upstream end portion and a liquid outlet located in the downstream end portion in the flow guide direction, and a gap exists between the outer contour of the part, located in the hole, of the flow guide piece and the inner circumferential wall of the hole; the liquid outlet is located closer to the preset side wall than the electrode assembly and closer to the electrode assembly than the preset side wall. Therefore, the infiltration effect of the electrolyte on the electrode assembly is improved, the service life of the battery monomer can be prolonged, and the use reliability can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices, and power-consuming devices. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and battery devices are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the battery device can provide all or part of the power. In the field of energy storage, battery devices can be installed in energy storage boxes or directly on the user side.

[0003] In related technologies, battery devices include battery cells, which in turn include a casing and electrode components housed within the casing. During the manufacturing process of the battery cell, electrolyte is injected into the casing containing the electrode components to wet them. If unvented gas exists within the electrode components, insufficient wetting by the electrolyte may lead to lithium plating, posing a safety hazard or resulting in the battery cell failing to achieve its expected capacity. Therefore, improving the wetting effect of the electrolyte on the electrode components is one of the ongoing challenges facing the industry. Utility Model Content

[0004] To address the aforementioned technical problems, embodiments of this application provide a battery cell, a battery device, and an electrical device to improve the wetting effect of the electrolyte on the electrode assembly.

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

[0006] A first aspect of this application provides a battery cell, comprising: a housing including an opening and an end cap assembly covering the opening, the end cap assembly having a pore communicating with a space within the housing, the housing including a predetermined sidewall; an electrode assembly located within the housing, the electrode assembly and the predetermined sidewall being arranged along a first direction, the electrode assembly and the end cap assembly being arranged along a second direction, the first direction and the second direction being intersected; and a flow guide extending through the pore, the flow guide having an inlet at an upstream end along the flow direction and an outlet at a downstream end, wherein a gap exists between the outer contour of the portion of the flow guide in the pore and the inner peripheral wall of the pore, and along the first direction, the outlet is located closer to the predetermined sidewall and closer to the electrode assembly than the predetermined sidewall.

[0007] Because there is a gap between the outer contour of the portion of the guide element located in the pore and the inner peripheral wall of the pore, gas inside the shell can be discharged through the gap during the process of electrolyte flowing into the shell. This increases the electrolyte injection rate and improves the electrolyte wetting performance of the electrode assembly. Furthermore, a single through hole can accommodate both the passage of the guide element and the air supply / venting. Since the outlet is located closer to the electrode assembly than the preset sidewall and closer to the electrode assembly than the preset sidewall, it facilitates the guidance of electrolyte flow from between the electrode assembly and the preset sidewall to the bottom of the electrode assembly. Wetting begins from the bottom of the electrode assembly upwards, and gas inside the electrode assembly is gradually discharged as electrolyte enters and exits through the pore to the outside of the shell. This suppresses the possibility of gas being trapped inside the electrode assembly (also known as "liquid seal") when electrolyte wets from the periphery to the center of the electrode assembly, thus improving the electrolyte wetting effect on the electrode assembly. Furthermore, it reduces the probability of lithium plating caused by liquid sealing, thereby reducing the safety risks associated with lithium plating. It also reduces the risk of failing to achieve the expected capacity performance due to gas in the electrode assembly. Therefore, it can improve the service life and reliability of the battery cell.

[0008] In some embodiments, the flow guide includes at least a flow guide section extending in a second direction and located in a first direction between the electrode assembly and a preset sidewall.

[0009] The flow guide section extends along the second direction and is located between the electrode assembly and the preset sidewall along the first direction. This facilitates the placement of the liquid outlet between the electrode assembly and the preset sidewall along the first direction, and the placement of the liquid outlet near the bottom of the electrode assembly along the first direction. This allows the electrolyte to flow directly from between the electrode assembly and the preset sidewall to the bottom of the electrode assembly, enabling the electrolyte to wet the electrode assembly from the bottom. This reduces the probability of liquid sealing in the electrode assembly and improves the wetting effect of the electrolyte on the electrode assembly.

[0010] In some embodiments, the flow guide includes a first flow guide section, a second flow guide section, and a third flow guide section connected in sequence. The first flow guide section has a liquid inlet, and the third flow guide section has a liquid outlet. The first flow guide section extends along a second direction and passes through an aperture, while the second flow guide section extends along a first direction. Along the second direction, the second flow guide section is located between the electrode assembly and the end cap assembly. The third flow guide section extends along the second direction and is located between the electrode assembly and a preset sidewall along the first direction.

[0011] Since the flow guide includes a first flow guide section, a second flow guide section, and a third flow guide section connected in sequence, even if the orifice is located in the center of the end cap assembly, the flow guide can avoid the components inside the housing and guide the electrolyte to the bottom of the electrode assembly, improving the wetting effect of the electrolyte on the electrode assembly. Moreover, the second flow guide section is located between the electrode assembly and the end cap assembly, so the second flow guide section can play a buffering role for the electrode assembly, reducing the risk of damage, powder shedding, and other defects caused by the electrode assembly colliding with the end cap assembly; similarly, the third flow guide section can play a buffering role between the electrode assembly and the predetermined sidewall.

[0012] In some embodiments, along the second direction, the ratio of the distance between the outlet and the first end of the electrode assembly away from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 2.

[0013] Therefore, along the second direction, the distance between the liquid outlet and the bottom of the electrode assembly is closer, which can improve the reliability of the electrolyte wetting from the bottom of the electrode assembly, reduce the probability of liquid sealing of the electrode assembly, and improve the wetting effect of the electrolyte.

[0014] In some embodiments, along the second direction, the ratio of the distance between the outlet and the first end of the electrode assembly away from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 3.

[0015] Therefore, along the second direction, the distance between the outlet and the bottom of the electrode assembly is closer, which can further improve the reliability of the electrolyte wetting from the bottom of the electrode assembly, reduce the probability of liquid sealing of the electrode assembly, and improve the wetting effect of the electrolyte on the electrode assembly, especially the middle part of the electrode assembly.

[0016] In some embodiments, the guide member located between the electrode assembly and the preset sidewall along a first direction has at least one hole opening toward the preset sidewall, the hole communicating with the inner cavity of the guide tube.

[0017] Since the guide section located between the electrode assembly and the preset sidewall along the first direction has at least one hole opening towards the preset sidewall, the electrolyte can flow into the housing not only from the outlet but also from the hole, which can accelerate the outflow of electrolyte, shorten the injection time, and improve the injection efficiency. The hole facing the preset sidewall reduces the probability of the electrolyte wetting the end of the electrode assembly along the first direction when it flows out of the hole, improving the reliability of the electrolyte wetting from the bottom of the electrode assembly. Since the electrolyte gradually wets from the bottom to the top of the electrode assembly, the probability of liquid sealing of the electrode assembly can be reduced, and the electrolyte wetting effect on the electrode assembly, especially the middle part of the electrode assembly, can be improved.

[0018] In some embodiments, along the second direction, the ratio of the distance between the hole furthest from the outlet and the first end of the electrode assembly furthest from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 2.

[0019] This further improves the reliability of the electrolyte flowing out of the holes from the bottom of the electrode assembly to wet the electrode assembly. The electrolyte gradually wets the electrode assembly from the bottom to the top, reducing the probability of liquid sealing and improving the electrolyte wetting effect on the electrode assembly, especially the middle part of the electrode assembly.

[0020] In some embodiments, along the second direction, the ratio of the distance between the hole furthest from the outlet and the first end of the electrode assembly furthest from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 3.

[0021] This further improves the reliability of the electrolyte flowing out of the holes from the bottom of the electrode assembly to wet the electrode assembly. The electrolyte gradually wets the electrode assembly from the bottom to the top, reducing the probability of liquid sealing and improving the electrolyte wetting performance of the electrode assembly, especially the middle part of the electrode assembly.

[0022] In some embodiments, along a second direction, a second flow guide section is spaced apart from the electrode assembly; and / or, along a first direction, a third flow guide section is spaced apart from the electrode assembly.

[0023] The second flow guide section is spaced apart from the electrode assembly, which allows for a larger buffer space between the electrode assembly and the end cap assembly; the third flow guide section is spaced apart from the electrode assembly, which improves the reliability of the electrolyte wetting from the bottom of the electrode assembly, reduces the probability of wetting from the middle of the electrode assembly, and reduces the risk of liquid sealing.

[0024] In some embodiments, the preset sidewall includes a first sidewall and a second sidewall, the first sidewall is connected to the second sidewall and the wall surface of the first sidewall is larger than the wall surface of the second sidewall, and the third flow guide section is located between the second sidewall and the electrode assembly.

[0025] Since the third flow guide section is located between the second sidewall and the electrode assembly, it reduces the space occupied in the housing for arranging the flow guide, thereby improving the volume utilization rate of the battery cell.

[0026] In some embodiments, the battery cell further includes an electrode terminal, a positive electrode adapter, and a negative electrode adapter. The electrode terminal is located on the side of the end cover assembly facing away from the electrode assembly along the second direction. The positive electrode adapter and the negative electrode adapter are located on the side of the end cover assembly close to the electrode assembly along the second direction. The electrode assembly includes a first electrode assembly and a second electrode assembly. Both the first electrode assembly and the second electrode assembly include a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to the positive electrode adapter, and the negative electrode tab is connected to the negative electrode adapter. A first gap is formed between the positive electrode adapter, the positive electrode tab of the first electrode assembly, and the positive electrode tab of the second electrode assembly. A second current-conducting section passes through the first gap. Alternatively, a second gap is formed between the negative electrode adapter, the negative electrode tab of the first electrode assembly, and the negative electrode tab of the second electrode assembly. A second current-conducting section passes through the second gap.

[0027] This allows for the clever use of the gap between the adapter and the tabs of the two electrode assemblies to arrange the second flow guide section, achieving a compact layout while avoiding structural interference, which is beneficial for improving volume utilization.

[0028] In some embodiments, the portion of the guide member located in the pore is connected to the inner peripheral wall of the pore.

[0029] Since the guide can be connected to the inner circumferential wall of the pore, it can be positioned to improve the consistency of the liquid inlet position of the guide, making it easier for the liquid injection equipment to inject liquid accurately and efficiently from the liquid inlet; moreover, it can also reduce the risk of the guide shaking.

[0030] In some embodiments, the liquid inlet is located in the pore along the second direction, or the liquid inlet is located on the side of the pore opposite to the electrode assembly along the second direction.

[0031] This allows for easy injection of electrolyte into the space inside the casing through the inlet.

[0032] In some embodiments, the flow guide is configured as a tube with a closed cross-section and is elastic.

[0033] Therefore, the flow guide can be realized with a simple structure, which makes it easy to reliably guide the electrolyte to a position near the bottom of the electrode assembly; moreover, since the flow guide is elastic, it will not damage the electrode assembly even if it comes into contact with the electrode assembly, and can also play a buffering role.

[0034] In some embodiments, the material of the flow guide includes any one of polyurethane, polyvinylidene fluoride, and polyamide.

[0035] Polyurethane, polyvinylidene fluoride, and polyamide are particularly suitable as materials for flow guiding components because of their elasticity, insulation, and corrosion resistance.

[0036] In some embodiments, the flow guide includes a flow guide body and a wrapping layer that covers the outer surface of the flow guide body. The flow guide body is configured as a tube with a closed cross-section, and the wrapping layer is elastic.

[0037] Therefore, the main body of the flow guide can be realized with a simple structure, which facilitates the reliable flow of electrolyte to the bottom of the electrode assembly. Moreover, since the coating layer is elastic, it will not damage the electrode assembly even when it comes into contact with it, and it can also play a buffering role. In addition, because the coating layer is elastic, the main body of the flow guide can be made of a material with a higher hardness than the coating layer, which increases the freedom of material selection for the main body of the flow guide.

[0038] In some embodiments, the encapsulation layer is any one of polyurethane, polyvinylidene fluoride, and polyamide.

[0039] Polyurethane, polyvinylidene fluoride, and polyamide are particularly suitable as materials for the coating layer in flow guides because of their elasticity, insulation, and corrosion resistance.

[0040] In some embodiments, the battery cell further includes a sealing element for sealing pores and liquid inlets.

[0041] Because it has a sealing component, it can reduce the risk of electrolyte leakage from pores or inlet.

[0042] A second aspect of this application provides a battery device comprising a plurality of battery cells provided in the first aspect of this application.

[0043] Because the electrolyte wettability of the battery cells has been improved, both their service life and reliability have been enhanced, and consequently, the service life and reliability of the battery device have also been improved.

[0044] A third aspect of this application provides an electrical device, including at least one battery cell provided in the first aspect of this application or at least one battery device provided in the second aspect of this application, wherein the battery cell or battery device is used to store or provide electrical energy.

[0045] Because the electrolyte wettability of the battery cells has been improved, the service life and reliability of the battery cells and even the battery devices have been improved, which in turn has improved the reliability of the electrical devices. Attached Figure Description

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0047] Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application;

[0048] Figure 2 Exploded perspective view of a battery device provided for some embodiments of this application;

[0049] Figure 3 Schematic diagrams of the structure of a battery cell provided for some embodiments of this application;

[0050] Figure 4 Provided for some embodiments of this application Figure 3 AA sectional view;

[0051] Figure 5 Provided for some embodiments of this application Figure 3 BB cross-sectional diagram;

[0052] Figure 6 A partial structural schematic diagram of a battery cell provided for some embodiments of this application;

[0053] Figure 7 A top view of a single battery cell provided for some embodiments of this application;

[0054] Figure 8 Provided for some embodiments of this application Figure 7 Enlarged schematic diagram of region C;

[0055] Figure 9 A three-dimensional structural schematic diagram of a battery cell provided for further embodiments of this application;

[0056] Figure 10 A partial structural schematic diagram of a battery cell provided for some further embodiments of this application.

[0057] Explanation of reference numerals in the attached figures

[0058] 1000 Vehicle; 100 Battery Unit; 200 Controller; 300 Motor; 10 Battery Cell; 20 Housing; 20a First Housing; 20b Second Housing; 1 Outer Shell; 11 Housing; 111 Preset Side Wall; 1111 First Side Wall; 1112 Second Side Wall; 12 End Cap Assembly; 121 Hole; 122 Main End Cap; 123 Stop; 1221 Insulator; 1222 End Cap Body; 2 Electrode Assembly; 21 First Electrode Assembly; 22 Second Electrode Assembly; 23 First End; 3 Guide Component; 3a Liquid Inlet; 3b Liquid Outlet; 31 First Guide Section; 32 Second Guide Section; 33 Third Guide Section; 331 Hole; 35 Encapsulation Layer; 36 Guide Component Body; 41 Positive Tab; 42 Negative Tab; 5 Electrode Terminal; 61 Positive Adapter; 62 Negative Adapter; X First Direction; Y Second Direction. Detailed Implementation

[0059] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0062] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0064] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "linking," "communication," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0067] The following is a detailed description of this application.

[0068] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and battery devices are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the battery device can provide all or part of the power. In the field of energy storage, battery devices can be installed in energy storage boxes or directly on the user side.

[0069] In related technologies, battery devices include battery cells, which in turn include a casing and electrode components housed within the casing. During the manufacturing process of the battery cell, electrolyte is injected into the casing containing the electrode components to wet them. If unvented gas exists within the electrode components, insufficient wetting by the electrolyte may lead to lithium plating, posing a safety hazard or resulting in the battery cell failing to achieve its expected capacity. Therefore, improving the wetting effect of the electrolyte on the electrode components is one of the ongoing challenges facing the industry.

[0070] Research shows that the electrode assembly and the preset sidewall are arranged along the first direction, and an injection channel is provided on the end cap assembly. During the electrolyte injection process of the battery cell, the end cap assembly and the electrode assembly are arranged in the vertical direction, with the end cap assembly located above the electrode assembly. As the electrolyte injected from the injection channel flows downward, it wets the electrode assembly. It is possible that the electrolyte wets the electrode assembly from the periphery to the center, which can cause the electrolyte around the electrode assembly to easily form a liquid seal that blocks the gas exhaust channel. Therefore, the gas in the center of the electrode assembly is difficult to exhaust, thus affecting the wetting effect of the electrolyte on the center of the electrode assembly.

[0071] To reduce the probability of liquid sealing in the electrode assembly, it is desirable for the electrolyte to gradually wet the assembly from the bottom upwards. The venting channels of the electrode assembly should remain open until the electrolyte completely submerges it, allowing gas to escape from the top. To achieve this, a flow guide is considered. This guide directs the electrolyte between the electrode assembly and a pre-designed sidewall, ensuring the electrolyte flows as far as possible towards the bottom of the assembly, reducing accumulation at the top. This bottom-up wetting process further reduces the probability of liquid sealing and improves the wetting effect. To facilitate timely removal of gas from the casing, a gap exists between the outer contour of the flow guide within the pores and the inner wall of the pores. This gap allows gas to escape from the casing as the electrolyte flows into it. Moreover, this design concept can utilize the existing liquid injection holes in the battery cells without requiring significant modifications to the top cover, liquid injection equipment, and liquid injection process of the battery cells.

[0072] Based on this design concept, this application provides a battery cell, which includes: a housing, including a housing with an opening and an end cap assembly covering the opening, the end cap assembly having a hole communicating with a space inside the housing, the housing including a preset sidewall; an electrode assembly located inside the housing, the electrode assembly and the preset sidewall being arranged along a first direction, the electrode assembly and the end cap assembly being arranged along a second direction, the first direction and the second direction being arranged intersectingly; and a flow guide, the flow guide passing through the hole, the flow guide having an inlet at an upstream end along the flow direction and an outlet at a downstream end, wherein there is a gap between the outer contour of the portion of the flow guide in the hole and the inner peripheral wall of the hole, and along the first direction, the outlet is located closer to the preset sidewall than the electrode assembly and closer to the electrode assembly than the preset sidewall. Because there is a gap between the outer contour of the portion of the guide element located in the pore and the inner peripheral wall of the pore, gas inside the shell can be discharged through the gap during the process of electrolyte flowing into the shell. This increases the electrolyte injection rate and improves the electrolyte wetting performance of the electrode assembly. Furthermore, a single through hole can accommodate both the passage of the guide element and the air supply / venting. Since the outlet is located closer to the preset sidewall and closer to the electrode assembly than the preset sidewall, it facilitates the direct flow of electrolyte from between the electrode assembly and the preset sidewall to the bottom of the electrode assembly. Wetting begins from the bottom of the electrode assembly upwards, and gas inside the electrode assembly is gradually discharged as electrolyte enters and exits through the pore to the outside of the shell. This suppresses the possibility of gas being trapped inside the electrode assembly (also known as "liquid seal") when electrolyte wets from the periphery to the center of the electrode assembly, thus improving the electrolyte wetting effect on the electrode assembly. Furthermore, it reduces the probability of lithium plating caused by liquid sealing, thereby reducing the safety risks associated with lithium plating. It also reduces the risk of failing to achieve the expected capacity performance due to gas in the electrode assembly. Therefore, it can improve the service life and reliability of the battery cell.

[0073] The battery cells and battery devices provided in this application embodiment can be used, but are not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0074] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] In the following embodiments, for ease of explanation, an example of an electrical device of this application, namely a vehicle 1000, will be used for illustration.

[0076] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0077] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Figure 2 This is an exploded perspective view of a battery device 100 provided for some embodiments of this application; the battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via busbars.

[0079] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0080] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0081] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0082] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 10 to the housing 20.

[0083] As an example, the housing 20 may include a first housing 20a and a second housing 20b. The first housing 20a and the second housing 20b are fastened together, forming a closed space inside the housing 20 to house the battery cell 10 assembly. Here, "closed" refers to covering or shutting off; it can be sealed or unsealed. The first housing 20a may be a top cover or a bottom plate. In this embodiment, the battery cell 10 may be a rechargeable battery, meaning a battery cell that can be recharged after discharge to activate its active materials and continue to be used.

[0084] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0085] Battery cell 10 generally includes electrode assembly 2 (see Figure 4 ).For example Figure 7 and Figure 8 As shown, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through.

[0086] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0087] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0088] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, copper, aluminum, nickel, titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of this application are not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0090] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0091] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0092] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver surface treatment, or stainless steel, copper, aluminum, nickel, titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0093] In some embodiments, the electrode assembly 2 further includes an isolator disposed between the positive and negative electrodes.

[0094] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0095] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0096] In some embodiments, the battery cell 10 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes are also referred to herein as "electrolytes".

[0097] Liquid electrolytes include electrolyte salts and solvents.

[0098] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0099] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0100] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0101] In some embodiments, the electrode assembly 2 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0102] In some embodiments, the electrode assembly 2 has a stacked structure.

[0103] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0104] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0105] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0106] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0107] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0108] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0109] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0110] In some embodiments, the battery cell 10 may include a housing 1. The housing 1 is used to encapsulate the electrode assembly 2 and components such as the electrolyte. The housing 1 may be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0111] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0112] In some embodiments, such as Figure 3 As shown, the outer casing 1 includes an end cap assembly 12 and a housing 11. The housing 11 has an opening, and the end cap assembly 12 closes the opening to form a sealed space for accommodating the electrode assembly 2 and substances such as electrolytes. The housing 11 may have one or more openings. The end cap assembly 12 may also have one or more.

[0113] In some embodiments, at least one electrode terminal is provided on the housing 1, and the electrode terminal is electrically connected to a tab (not shown). The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap assembly 12, or it can be provided on the housing 11.

[0114] In some embodiments, a pressure relief mechanism (not shown) is provided on the housing 1. The pressure relief mechanism is used to release the internal pressure of the battery cell 10.

[0115] Below, refer to Figures 3 to 8 Some embodiments of this application will be described in detail.

[0116] In the description of the embodiments of this disclosure, for ease of explanation, the direction of arrow X is used to represent "first direction X", and the direction of arrow Y is used to represent "second direction Y". The first direction X and the second direction Y intersect; further, the first direction X and the second direction Y can be perpendicular. It should be noted that when the first direction X and the second direction Y are perpendicular, the first direction X refers to the set of directions perpendicular to the second direction Y. Figure 3 The first direction X is shown as an example.

[0117] The first aspect of this application provides a battery cell, such as Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown, the battery cell includes a housing 1, an electrode assembly 2, and a flow guide 3. The housing 1 includes a shell 11 with an opening and an end cap assembly 12 covering the opening. The end cap assembly 12 has a hole 121 communicating with the space inside the housing 1. The shell 11 includes a predetermined sidewall 111. The electrode assembly 2 is located inside the housing 1. The electrode assembly 2 and the predetermined sidewall 111 are arranged along a first direction X, and the electrode assembly 2 and the end cap assembly 12 are arranged along a second direction Y. The first direction X and the second direction Y are arranged intersectingly. The flow guide 3 passes through the hole 121. The flow guide 3 has an inlet 3a located at the upstream end along the flow direction and an outlet 3b located at the downstream end. There is a gap between the outer contour of the portion of the flow guide 3 in the hole 121 and the inner peripheral wall of the hole 121. Along the first direction X, the outlet 3b is located closer to the predetermined sidewall 111 than the electrode assembly 2 and closer to the electrode assembly 2 than the predetermined sidewall 111.

[0118] like Figure 3 and Figure 4 As shown, the battery cell 10 includes a housing 1. The housing 1 may include a shell 11 with an opening and an end cap assembly 12 that closes the opening. Exemplarily, the end cap assembly 12 may be connected to the shell 11 by welding, bonding, or other means.

[0119] like Figure 4 and Figure 5 As shown, the battery cell 10 includes an electrode assembly 2, which is housed within a receiving space defined by the housing 1. In some embodiments, the electrode assembly 2 includes tabs (e.g., a positive tab 41 and a negative tab 42), which are electrically connected to electrode terminals 5. The tabs and electrode terminals 5 can be directly connected or indirectly connected, for example, through adapters (e.g., a positive adapter 61 and a negative adapter 62).

[0120] In some embodiments, such as Figure 3As shown, the end cap assembly 12 can be located at the top, bottom, left, right, front, or rear of the housing 11. In one specific embodiment, the end cap assembly 12 is located at the top of the housing 11.

[0121] In some embodiments, such as Figures 3 to 6 As shown, the end cap assembly 12 has a hole 121 that penetrates the end cap assembly 12 to connect the space outside the housing 1 with the space inside the housing 1.

[0122] Optionally, the pore 121 can be a regular or irregular shape such as a cuboid or cylinder. The size of the pore 121 should be sufficient to allow the guide member 3 to pass through the end cap assembly 12, and to allow a gap between the outer contour of the portion of the guide member 3 within the pore 121 and the inner peripheral wall of the pore 121. There are no particular restrictions on the size of the gap, as long as it can form a gas passage.

[0123] In some embodiments, such as Figure 4 and Figure 5 As shown, the housing 11 includes multiple housing walls, one of which is an end cap assembly 12. The multiple housing walls also include a preset side wall 111. The housing 11 contains an electrode assembly 2. The electrode assembly 2 and the preset side wall 111 are arranged along a first direction X, and the electrode assembly 2 and the end cap assembly 12 are arranged along a second direction Y. The first direction X and the second direction Y are arranged intersectingly, and can further be perpendicular.

[0124] The flow guide 3 includes an inlet 3a and an outlet 3b that are interconnected. Along the flow direction, the inlet 3a is located at the upstream end, and the outlet 3b is located at the downstream end. The flow guide 3 connects the space inside and outside the housing 1, allowing electrolyte to be injected from outside the housing 1 into the housing 1. Electrolyte can be injected into the inlet 3a, and after flowing through the internal channel of the flow guide 3, it reaches the outlet 3b and flows into the housing 1. Specifically, the inlet 3a refers to the inlet where the electrolyte flows into the flow guide 3, and the outlet 3b refers to the outlet where the electrolyte flows out of the flow guide 3.

[0125] Optionally, the flow guide 3 may be a pipe structure provided on the end cap assembly 12 that connects the inside and outside of the housing 1.

[0126] Optionally, the extension direction of the guide member 3 can be such that it can guide the electrolyte to the space between the electrode assembly 2 and the preset sidewall 111, avoiding other components inside the housing 1. For example, the guide member 3 can extend along the second direction Y towards the electrode assembly 2, and then along the first direction X towards the preset sidewall 111 until the outlet 3b is located closer to the preset sidewall 111 than the electrode assembly 2 and closer to the electrode assembly 2 than the preset sidewall 111. Of course, in other embodiments, the guide member 3 can also extend along the second direction Y towards the electrode assembly 2, then along the first direction X towards the preset sidewall 111 until it is closer to the electrode assembly 2 and closer to the electrode assembly 2 than the preset sidewall 111 and closer to the electrode assembly 2, and then along the second direction Y away from the end cap assembly 12 to the space between the electrode assembly 2 and the preset sidewall 111. In some embodiments, the liquid inlet 3a is located on the side of the end cap assembly 12 opposite to the electrode assembly 2 along the second direction Y, and the liquid outlet 3b is located on the side of the end cap assembly 12 closer to the electrode assembly 2 along the second direction Y.

[0127] This application does not specifically limit the shape of the inlet 3a, as long as it allows the electrolyte to be injected. This application does not specifically limit the shape of the outlet 3b, as long as it allows the electrolyte to flow out. This application does not specifically limit the shape and size of the inlet 3a and outlet 3b. For example, the inlet 3a can be circular, and its inner diameter can be in the range of 2mm to 3mm. The outlet 3b can also be circular, and its inner diameter can be in the range of 2mm to 3mm. The outer contour of the pore 121 perpendicular to the second direction Y can also be circular, and its inner diameter can be in the range of 4mm to 6mm. It should be noted that the outer contours of the inlet 3a and outlet 3b can be the same or different.

[0128] In some embodiments, the flow guide 3 can be one, two, or more sets. For example, there are two flow guides 3, which are located between the same preset sidewall 111 and the electrode assembly 2. The preset sidewall 111 can refer to a first sidewall or a second sidewall. The first sidewall is connected to the second sidewall, and the wall surface of the first sidewall is larger than the wall surface of the second sidewall. Alternatively, the two flow guides 3 can be located between two preset sidewalls 111 and the electrode assembly 2, respectively. The two preset sidewalls 111 can be substantially parallel or substantially perpendicular.

[0129] For example, the two pre-designed sidewalls 111 may be substantially parallel, and the two pre-designed sidewalls 111 are respectively located on opposite sides of the electrode assembly 2. The pre-designed sidewalls 111 may include two first sidewalls opposite to each other and two second sidewalls opposite to each other on both sides. The flow guide 3 may be located between the first sidewall and the electrode assembly 2, or it may be located between the second sidewall and the electrode assembly 2. This application exemplarily illustrates an embodiment with a flow guide 3 located between the second sidewall and the electrode assembly 2.

[0130] In some embodiments, such as Figure 7 and Figure 8 As shown, there is a gap between the outer contour of the portion of the guide member 3 located in the pore 121 and the inner peripheral wall of the pore 121.

[0131] In some embodiments, such as Figure 7 and Figure 8 As shown, when projected along the second direction Y into the same projection plane, the projection of the portion of the guide member 3 located in the aperture 121 is within the area enclosed by the projection of the inner periphery of the aperture 121, and there is a gap between the outer contour of the projection of the guide member 3 and the projection of the inner periphery of the aperture 121.

[0132] In a specific embodiment, such as Figure 7 and Figure 8 As shown, when viewed along the second direction Y, the outer contour of the portion of the guide member 3 within the aperture 121 is circular, and the aperture 121 is also circular. The diameter (outer diameter) of the portion of the guide member 3 within the aperture 121 is smaller than the diameter (inner diameter) of the aperture 121. Of course, when viewed along the second direction Y, the shape of the outer contour of the portion of the guide member 3 within the aperture 121 and the outer contour of the aperture 121 can be similar or dissimilar. For example, the aperture 121 may be formed as a square hole while the guide member 3 has a circular outer contour.

[0133] Because there is a gap between the outer contour of the portion of the guide member 3 located in the pore 121 and the inner peripheral wall of the pore 121, the gas inside the shell 1 can be discharged from the gap during the process of electrolyte flowing into the shell 1. This can improve the electrolyte injection rate and enhance the electrolyte wetting performance of the electrode assembly 2. Since the outlet 3b is located between the electrode assembly and the preset sidewall, it is beneficial for the electrolyte to flow directly from the electrode assembly 2 between the electrode assembly 2 and the preset sidewall 111 to the bottom of the electrode assembly 2. Wetting begins from the bottom of the electrode assembly 2 upwards. The gas inside the electrode assembly is gradually discharged as the electrolyte enters and is discharged from the pore to the outside of the shell. This can suppress the possibility of gas being sealed in the electrode assembly (also known as "liquid seal") when the electrolyte wets from the periphery to the center of the electrode assembly 2, and improve the electrolyte wetting effect on the electrode assembly. Furthermore, it reduces the probability of lithium plating caused by liquid sealing, thereby reducing the safety risks associated with lithium plating. It also reduces the risk of failing to achieve the expected capacity performance due to gas in the electrode assembly. Therefore, it can improve the service life and reliability of the battery cell.

[0134] In some embodiments, such as Figure 6 and Figure 10 As shown, the flow guide 3 includes at least a flow guide section that extends along the second direction Y and is located between the electrode assembly 2 and the preset sidewall 111 along the first direction X.

[0135] In a specific embodiment, such as Figure 6 As shown, the flow guide 3 includes a flow guide section (e.g., a third flow guide section 33) extending along the second direction Y and located between the electrode assembly 2 and the preset sidewall 111 along the first direction X. The liquid outlet 3b is located at the end of this flow guide section (e.g., the third flow guide section 33). The flow guide 3 also includes other flow guide sections (e.g., the second flow guide section 32 and the first flow guide section 31). The other flow guide sections (e.g., the second flow guide section 32 and the first flow guide section 31) guide the electrolyte at the liquid inlet 3a to the flow guide section located between the electrode assembly 2 and the preset sidewall 111 along the first direction X. The electrolyte flows into the housing from the outlet (e.g., the liquid outlet 3b) of the flow guide section located between the electrode assembly 2 and the preset sidewall 111 along the first direction X.

[0136] In another specific embodiment, such as Figure 10 As shown, the flow guide 3 includes a flow guide section extending along the second direction Y and located between the electrode assembly 2 and the preset sidewall 111 along the first direction X. For example, this flow guide section is referred to as the fourth flow guide section. The liquid inlet 3a is located at the upstream end of the fourth flow guide section along the flow guide direction, and the liquid outlet 3b is located at the downstream end of the fourth flow guide section along the flow guide direction.

[0137] The guide section extends along the second direction Y and is located between the electrode assembly 2 and the preset sidewall 111 along the first direction X. This facilitates the placement of the liquid outlet 3b between the electrode assembly 2 and the preset sidewall 111 along the first direction X, and the placement of the liquid outlet 3b near the bottom of the electrode assembly 2 along the first direction X. This allows the electrolyte to flow directly from between the electrode assembly 2 and the preset sidewall 111 to the bottom of the electrode assembly, enabling the electrolyte to wet the electrode assembly from the bottom. This reduces the probability of liquid sealing in the electrode assembly and improves the wetting effect of the electrolyte on the electrode assembly.

[0138] In some embodiments, such as Figure 4 and Figure 6 As shown, the flow guide 3 includes a first flow guide section 31, a second flow guide section 32, and a third flow guide section 33 connected in sequence. The first flow guide section 31 has a liquid inlet 3a, and the third flow guide section 33 has a liquid outlet 3b. The first flow guide section 31 extends along the second direction Y and passes through the orifice 121. The second flow guide section 32 extends along the first direction X. Along the second direction Y, the second flow guide section 32 is located between the electrode assembly 2 and the end cap assembly 12. The third flow guide section 33 extends along the second direction Y and is located between the electrode assembly 2 and the preset sidewall 111 along the first direction X.

[0139] The flow guide 3 includes a first flow guide section 31, a second flow guide section 32, and a third flow guide section 33 connected in sequence. The first flow guide section 31 has a liquid inlet 3a and extends along the second direction Y in a direction that moves further away from the liquid inlet 3a, extending to the space between the end cap assembly 12 and the electrode assembly 2. The second flow guide section 32 is connected to the end of the first flow guide section 31 along the second direction Y that moves away from the liquid inlet 3a, and extends along the first direction X in a direction that moves closer to the preset sidewall 111, extending to the space between the electrode assembly 2 and the preset sidewall 111. The third flow guide section 33 is connected to the end of the second flow guide section 32 along the first direction X that moves closer to the preset sidewall 111, and extends along the second direction Y in a direction that moves further away from the end cap assembly 12. The liquid outlet 3b is located at the end of the third flow guide section 33 along the second direction Y that moves away from the end cap assembly 12.

[0140] Optionally, the cross-sectional shapes and dimensions of the first, second, and third guide sections can be the same or different. The first, second, and third guide sections can be three separate segments connected as a single unit; alternatively, they can be three segments of a single piece, formed by bending or molding. Figure 6 The shape shown.

[0141] Since the flow guide 3 includes a first flow guide section 31, a second flow guide section 32, and a third flow guide section 33 connected in sequence, even if the orifice is located in the center of the end cap assembly, the flow guide 3 can avoid the components inside the housing and guide the electrolyte to the bottom of the electrode assembly 2, thereby improving the wetting effect of the electrolyte on the electrode assembly. Moreover, the second flow guide section 32 is located between the electrode assembly 2 and the end cap assembly 12, so the second flow guide section 32 can play a buffering role for the electrode assembly, reducing the risk of damage, powder shedding, and other adverse conditions caused by the electrode assembly 2 colliding with the end cap assembly 12; similarly, the third flow guide section 33 can play a buffering role between the electrode assembly 2 and the preset sidewall 111.

[0142] In some embodiments, such as Figure 4 As shown, along the second direction Y, the ratio of the distance L3 between the outlet 3b and the first end 23 of the electrode assembly 2 away from the end cap assembly 12 to the length L2 of the electrode assembly 2 along the second direction Y is greater than 0 and less than or equal to 1 / 2.

[0143] Optionally, L3 / L2 can be 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3, or 1 / 2, or any other value between any two of the above. Along the second direction Y, the minimum distance L3 between the outlet 3b and the first end 23 of the electrode assembly 2 away from the end cap assembly 12 is such that the electrolyte can flow from the outlet 3b into the housing.

[0144] Therefore, along the second direction Y, the distance between the liquid outlet 3b and the bottom of the electrode assembly 2 is relatively close, which can improve the reliability of the electrolyte to start wetting from the bottom of the electrode assembly 2, reduce the probability of liquid sealing in the electrode assembly 2, and improve the wetting effect of the electrolyte.

[0145] In some embodiments, such as Figure 4 As shown, along the second direction Y, the ratio of the distance L3 between the outlet 3b and the first end 23 of the electrode assembly 2 away from the end cap assembly 12 to the length L2 of the electrode assembly 2 along the second direction Y is greater than 0 and less than or equal to 1 / 3.

[0146] Optionally, L3 / L2 can be 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4 or 1 / 3, or any other value between any two of the above.

[0147] Therefore, along the second direction Y, the distance between the outlet 3b and the bottom of the electrode assembly 2 is closer, which can further improve the reliability of the electrolyte to start wetting from the bottom of the electrode assembly 2, reduce the probability of liquid sealing in the electrode assembly 2, and improve the wetting effect of the electrolyte on the electrode assembly 2, especially the middle part of the electrode assembly 2.

[0148] In some embodiments, such as Figure 4 As shown, a flow guide section (e.g., located between electrode assembly 2 and preset sidewall 111 along the first direction X) Figure 4 The third guide section 33 shown has at least one hole 331 opening toward the preset sidewall 111, and the hole 331 communicates with the inner cavity of the guide member.

[0149] In some embodiments, along the first direction X, the hole 331 is disposed in a flow guide section located between the electrode assembly 2 and the preset sidewall 111 along the first direction X (e.g., ...). Figure 4 The third guide section 33) shown is located on the side near the preset sidewall 111. The hole 331 communicates with the inner cavity of the guide member, thereby allowing the electrolyte to flow into the outer casing 1 through the hole 331.

[0150] Optionally, there may be one, two or more holes 331. When there are multiple holes 331, the holes 331 may be arranged along the first direction X, or along the second direction Y, or irregularly. However, the holes 331 should generally face the preset sidewall 111. In other words, the opening of the holes 331 should avoid the direction facing the electrode assembly 2.

[0151] This application does not specifically limit the size, shape, and number of holes 331. In one specific embodiment, the outer contour of the hole 331 is circular, and the outer diameter of the hole 331 is in the range of 1cm to 3cm. For example, the outer diameter of the hole 331 can be 1cm, 1.5cm, 2cm, 2.5cm, or 3cm, or other values ​​between any two of the above values.

[0152] Since the guide section located between the electrode assembly 2 and the preset sidewall 111 along the first direction X has at least one hole 331 opening towards the preset sidewall, the electrolyte can flow into the housing 1 not only from the outlet 3b, but also from the hole 331, which can accelerate the outflow of electrolyte, shorten the injection time, and improve the injection efficiency. The hole 331 faces the preset sidewall 111, which reduces the probability that the electrolyte will wet the end of the electrode assembly 2 along the first direction X when it flows out from the hole 331, and improves the reliability of the electrolyte wetting from the bottom of the electrode assembly 2. Since the electrolyte gradually wets from the bottom to the top of the electrode assembly 2, the probability of liquid sealing of the electrode assembly 2 can be reduced, and the electrolyte wetting effect on the electrode assembly 2, especially the middle part of the electrode assembly, can be improved.

[0153] In some embodiments, along the second direction Y, the ratio of the distance L1 between the hole 331 furthest from the outlet 3b and the first end 23 of the electrode assembly 2 furthest from the end cap assembly 12 to the length L2 of the electrode assembly 2 along the second direction Y is greater than 0 and less than or equal to 1 / 2.

[0154] Distance L1 refers to the end of the hole 331 furthest from the first end 23 along the second direction Y (e.g., the end furthest from the first end 23). Figure 4 The distance between the upper end (shown) and the first end 23.

[0155] Optionally, L1 / L2 can be 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3, or 1 / 2, or any other value between the two mentioned above. The minimum achievable distance L1 must allow electrolyte to flow into the outer casing 1 through the hole 331.

[0156] This further improves the reliability of the electrolyte flowing out of the hole 331 from the bottom of the electrode assembly 2 to the top of the electrode assembly 2, reducing the probability of liquid sealing in the electrode assembly 2 and improving the electrolyte wetting effect on the electrode assembly 2, especially the middle part of the electrode assembly.

[0157] In some embodiments, along the second direction Y, the ratio of the distance L1 between the hole 331 furthest from the outlet 3b and the first end 23 of the electrode assembly 2 furthest from the end cap assembly 12 to the length L2 of the electrode assembly 2 along the second direction Y is greater than 0 and less than or equal to 1 / 3.

[0158] Optionally, L1 / L2 can be 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4 or 1 / 3, or any other value between any two of the above.

[0159] This further improves the reliability of the electrolyte flowing out of the hole 331 from the bottom of the electrode assembly 2 to the top of the electrode assembly 2, reducing the probability of liquid sealing in the electrode assembly 2 and improving the electrolyte wetting performance of the electrode assembly 2, especially the middle part of the electrode assembly.

[0160] In some embodiments, along the second direction Y, the second flow guide section 32 is spaced apart from the electrode assembly 2; and / or along the first direction X, the third flow guide section 33 is spaced apart from the electrode assembly 2.

[0161] Optionally, the second guide section 32 may abut against the insulating element 1221 included in the adapter and / or end cap assembly 12.

[0162] Optionally, the third guide section 33 can be attached to a preset sidewall, as long as it does not affect the outflow of electrolyte.

[0163] The second flow guide section 32 is spaced apart from the electrode assembly 2, which can reserve a larger buffer space between the electrode assembly 2 and the end cap assembly 12; the third flow guide section 33 is spaced apart from the electrode assembly 2, which can improve the reliability of the electrolyte from the bottom of the electrode assembly 2 to wet the electrolyte, reduce the probability of wetting from the middle of the electrode assembly 2, and reduce the risk of liquid sealing.

[0164] In some embodiments, such as Figure 4 and Figure 5 As shown, the preset sidewall 111 includes a first sidewall 1111 and a second sidewall 1112. The first sidewall 1111 is connected to the second sidewall 1112 and the wall surface of the first sidewall 1111 is larger than the wall surface of the second sidewall 1112. The third flow guide section 33 is located between the second sidewall 1112 and the electrode assembly 2.

[0165] The preset sidewall 111 includes intersecting first sidewalls 1111 (e.g. Figure 5 The left or right side wall shown) and the second side wall 1112 (e.g.) Figure 4 (as shown by the left or right side wall), the surface area of ​​the first side wall 1111 outside the housing 1 is greater than the surface area of ​​the second side wall 1112 outside the housing 1. Along the first direction X, the third guide section 33 is located between the second side wall 1112 and the electrode assembly 2.

[0166] In some specific embodiments, the housing 1 contains two electrode assemblies 2, namely a first electrode assembly 21 and a second electrode assembly 22. The arrangement direction of the first electrode assembly 21 and the second electrode assembly 22 is consistent with the facing direction of the first sidewall 1111. The third guide section 33 may be located between the second sidewall 1112 and the first electrode assembly 21 and the second electrode assembly 22.

[0167] Since the third flow guide section is located between the second sidewall and the electrode assembly, it reduces the space occupied in the housing for arranging the flow guide, thereby improving the volume utilization rate of the battery cell.

[0168] In some embodiments, such as Figure 4 and Figure 5As shown, the battery cell 10 also includes an electrode terminal 5, a positive electrode adapter 61, and a negative electrode adapter 62. The electrode terminal 5 is located on the side of the end cap assembly 12 opposite to the electrode assembly 2 along the second direction Y. The positive electrode adapter 61 and the negative electrode adapter 62 are located on the side of the end cap assembly 12 close to the electrode assembly 2 along the second direction Y. The electrode assembly 2 includes a first electrode assembly 21 and a second electrode assembly 22. Both the first electrode assembly 21 and the second electrode assembly 22 include a positive electrode tab 41 and a negative electrode tab 42. The positive electrode tab 41 is connected to the positive electrode adapter 61, and the negative electrode tab 42 is connected to the negative electrode adapter 62. A first gap is formed between the positive electrode adapter 61, the positive electrode tab 41 of the first electrode assembly 21, and the positive electrode tab 41 of the second electrode assembly 22. The second current-conducting section 32 passes through the first gap. Alternatively, a second gap is formed between the negative electrode adapter 62, the negative electrode tab 42 of the first electrode assembly 21, and the negative electrode tab 42 of the second electrode assembly 22. The second current-conducting section 32 passes through the second gap.

[0169] In some embodiments, such as Figure 5 As shown, the positive electrode tabs 41 of different electrode components are connected to the positive electrode terminal through the positive electrode adapter 61, and the negative electrode tabs 42 of different electrode components are connected to the negative electrode terminal through the negative electrode adapter 62. Thus, the electrode terminal can conduct current into or out of the electrode component.

[0170] In some embodiments, such as Figure 4 and Figure 5 As shown, the electrode assembly 2 includes at least two electrode assemblies 2 (e.g., a first electrode assembly 21 and a second electrode assembly 22), each electrode assembly 2 having a tab, and each tab of each electrode assembly 2 forming a gap with a corresponding adapter. The second flow guide section 32 can pass through the gap formed by one of the adapters and the connected tab to connect the first flow guide section 31 and the third flow guide section 33.

[0171] Optionally, such as Figure 10 As shown, the flow guide 3 can also be located in a position that completely avoids the electrode assembly 2, for example, extending in a straight line along the gap between the electrode assembly 2 and the preset sidewall 111.

[0172] In a specific embodiment, such as Figure 5 As shown, there is a first gap between the positive tab 41 of the first electrode assembly and the positive tab 41 of the second electrode assembly, which helps to provide clearance space for the second flow guide section 32. This helps to reduce the contact between the second flow guide section 32 and the tab, and reduces the probability of the second flow guide section 32 damaging the tab.

[0173] Similarly, a second gap may exist between the negative tab of the first electrode assembly and the negative tab of the second electrode assembly, and the second guide section 32 of the guide member 3 may also pass through the second gap. Correspondingly, the third guide section 33 is arranged on the side closer to the negative tab. In this embodiment, the first electrode assembly 21 and the second electrode assembly 22 are connected in parallel.

[0174] Optionally, this application does not specifically limit the shape and size of the first gap and the second gap, as long as the second guide section 32 can pass through.

[0175] The embodiments of this application can also be applied when the first electrode assembly 21 and the second electrode assembly 22 are connected in series. In some embodiments, the positive tab 41 of one electrode assembly may be electrically connected to the negative tab 42 of another electrode terminal, the negative tab 42 of one electrode assembly may be connected to the negative electrode terminal via a negative adapter 62, and the positive tab 41 of the other electrode terminal may be connected to the positive electrode terminal via a positive adapter 61. A third gap may be formed between the positive adapter 61, the negative adapter 62, the negative tab 42 of one electrode assembly (e.g., the first electrode assembly 21 or the second electrode assembly 22), and the positive tab 41 of the other electrode assembly (e.g., the first electrode assembly 21 or the second electrode assembly 22), and the second guide section 32 may pass through the third gap; or, a fourth gap may be formed between the positive tab 41 of one electrode assembly (e.g., the first electrode assembly 21 or the second electrode assembly 22), the negative tab 42 of the other electrode assembly (e.g., the first electrode assembly 21 or the second electrode assembly 22), and the connector connecting the positive tab 41 and the negative tab 42, and the second guide section 32 may pass through the fourth gap.

[0176] This allows for the clever use of the gap between the adapter and the tabs of the two electrode assemblies 2 to arrange the second flow guide section 32, thereby improving volume utilization while avoiding structural interference.

[0177] In some embodiments, the end cap assembly 12 includes a main end cap 122 and a stop 123 connected to one end of the main end cap 122 near the electrode assembly 2 along the second direction Y. The main end cap 122 covers the opening, and the stop 123 is located between the aperture 121 and the preset sidewall 111 along the first direction X. The stop 123 may be shaped to avoid the second guide section 32 and the third guide section 33, or it may have a clearance hole to avoid the second guide section 32 and the third guide section 33.

[0178] Furthermore, the main end cap 122 includes an insulating member 1221, and a stop 123 is connected to the side of the insulating member 1221 facing the electrode assembly 2. The stop 123 and the insulating member 1221 can be directly connected or indirectly connected. For example, the stop 123 and the insulating member 1221 are integrally formed.

[0179] In some embodiments, the stop 123 may be located on at least one side of the main end cap 122 along the first direction X. The stop 123 may have a positioning function, which can not only prevent the electrode assembly 2 from moving along the second direction Y, but also facilitate the end cap assembly 12 to be closed with the housing 11.

[0180] In some embodiments, such as Figure 4 As shown, the portion of the guide member 3 located in the pore 121 is connected to the inner peripheral wall of the pore 121.

[0181] The portion of the flow guide 3 located in the pore 121 can be directly or indirectly connected to the inner peripheral wall of the pore 121, for example, by bonding with structural adhesive.

[0182] Since the guide can be connected to the inner circumferential wall of the pore, it can be positioned to improve the consistency of the liquid inlet position of the guide, making it easier for the liquid injection equipment to inject liquid accurately and efficiently from the liquid inlet; moreover, it can also reduce the risk of the guide shaking.

[0183] In some embodiments, the end cap assembly 12 includes a main end cap 122, the main end cap 122 includes an end cap body 1222 and an insulating member 1221 mounted on the side of the end cap body 1222 facing the electrode assembly 2, and the aperture 121 penetrates the end cap body 1222 and the insulating member 1221 along the second direction Y.

[0184] The main end cap 122 includes an end cap body 1222 and an insulating member 1221. The insulating member 1221 is located between the end cap body 1222 and the electrode assembly 2. The insulating member 1221 can insulate the electrode assembly 2 from the end cap body 1222, thereby insulating the electrode assembly 2 from the end cap assembly 12.

[0185] In some embodiments, a portion of the aperture 121 is located in the end cap body 1222, and another portion is located in the insulating element 1221.

[0186] The insulating component 1221 may be made of an insulating material, such as insulating resin.

[0187] Since the end cap body 1222 has an insulating member 1221 on the side facing the electrode assembly 2, the electrode assembly 2 can be insulated from the end cap body 1222. Since the aperture 121 penetrates the end cap body 1222 and the insulating member 1221 along the second direction Y, the flow guide 3 can pass through the end cap body 1222 and the insulating member 1221 to guide the electrolyte into the housing 1.

[0188] In some embodiments, the second flow guide section 32 may be connected to the end cap assembly 12. For example, the second flow guide section 32 may be connected to at least one of the end cap body 1222 and the insulating member 1221.

[0189] In some embodiments, along the second direction Y, the liquid inlet 3a is located in the pore 121, or the liquid inlet 3a is located on the side of the pore 121 opposite to the electrode assembly 2 along the second direction Y.

[0190] Along the second direction Y, the liquid inlet 3a may not extend beyond or beyond one end of the aperture 121 away from the electrode assembly 2.

[0191] In one specific embodiment, along the second direction Y, the liquid inlet 3a can be substantially flush with one end of the electrode assembly 2 away from the aperture 121.

[0192] This allows for easy injection of electrolyte into the space inside the casing through the inlet.

[0193] In some embodiments, the guide member 3 is configured as a tube with a closed cross-section and is elastic.

[0194] Thus, the flow guide 3 can be realized with a simple structure, which makes it easy to reliably guide the electrolyte to a position close to the bottom of the electrode assembly 2; moreover, since the flow guide 3 is elastic, it will not damage the electrode assembly 2 even if it comes into contact with the electrode assembly 2, and can also play a buffering role.

[0195] In some embodiments, the material of the flow guide 3 includes any one of polyurethane, polyvinylidene fluoride, and polyamide.

[0196] The material of the flow guide 3 may include one of polyurethane, polyvinylidene fluoride, and polyamide.

[0197] Polyurethane, polyvinylidene fluoride, and polyamide are particularly suitable as materials for flow guiding components because of their elasticity, insulation, and corrosion resistance.

[0198] In some embodiments, the guide 3 includes a guide body 36 and a wrapping layer 35 that wraps the outer surface of the guide body. The guide body 36 is configured as a tube with a closed cross-section, and the wrapping layer 35 is elastic.

[0199] Therefore, the main body 36 of the flow guide can be realized with a simple structure, which facilitates the reliable flow of electrolyte to a position near the bottom of the electrode assembly 2. Moreover, since the coating layer 35 is elastic, it will not damage the electrode assembly even when it comes into contact with the electrode assembly 2, and can also play a buffering role. In addition, since the coating layer is elastic, the main body 36 of the flow guide can be made of a material with a higher hardness than the coating layer, which increases the freedom of material selection for the main body of the flow guide.

[0200] In some embodiments, the encapsulation layer 35 is made of any one of polyurethane, polyvinylidene fluoride, or polyamide.

[0201] The encapsulation layer 35 can be made of one of polyurethane, polyvinylidene fluoride, or polyamide.

[0202] Polyurethane, polyvinylidene fluoride, and polyamide are particularly suitable as materials for the wrapping layer in the flow guide 3 because they are elastic, insulating, and corrosion resistant.

[0203] In some embodiments, the battery cell 10 further includes a sealing element (not shown) for sealing the pore 121 and the liquid inlet 3a.

[0204] The sealing element (not shown) can be non-detachably connected to the end cap assembly 12, or it can be detachably connected. For example, the sealing element (not shown) can be a sealing pin or a sealing bolt. The sealing element (not shown) can be made of materials such as rubber or silicone.

[0205] In some embodiments, the outer contour of the plug (not shown) can be similar to the outer contour of the inlet 3a and the outer contour of the vent formed between the first guide section 31 and the orifice 121. The inlet 3a and the vent can be blocked by the plug (not shown), and then the gap between the plug (not shown) and the end cap assembly 12 can be sealed. For example, the gap between the plug (not shown) and the end cap assembly 12 can be sealed by welding.

[0206] When the flow guide 3 has a certain degree of elasticity, the flow guide 3 can deform under the action of the sealing component.

[0207] Because it has a sealing component, it can reduce the risk of electrolyte leakage from pores or inlet.

[0208] The second aspect of this application provides a battery device 100, which includes a plurality of battery cells 10 provided in the first aspect of this application.

[0209] Because the electrolyte wettability of the battery cells has been improved, both their service life and reliability have been enhanced, and consequently, the service life and reliability of the battery device have also been improved.

[0210] A third aspect of this application provides an electrical device, including at least one battery cell 10 provided in the first aspect of this application or at least one battery device 100 provided in the second aspect of this application, wherein the battery cell or battery device is used to store or provide electrical energy.

[0211] Because the electrolyte wettability of the battery cells has been improved, the service life and reliability of the battery cells and even the battery devices have been improved, which in turn has improved the reliability of the electrical devices.

[0212] In one specific embodiment, the diameter of the aperture 121 of the end cap assembly 12 is increased to 5 mm, and an elastic guide 3 with a diameter of 3.5 mm is bonded at the aperture using AB glue (two-component mixed hardening adhesive) or an insulating adhesive. The guide 3 has a thickness of 1 mm and is made of a polyurethane or other elastic material. When assembling the end cap assembly 12 with the electrode assembly 2, the guide 3 is placed on the side of the electrode assembly. Afterwards, other assembly steps can be performed normally. During a single liquid injection, the injection device is aligned with the inlet 3a of the guide 3. Because a gap is left at the aperture for gas escape, the injection process is very rapid, greatly improving injection efficiency. During the electrolyte injection process, the electrolyte flows along the gap between the electrode assembly 2 and the housing 11 towards the bottom of the electrode assembly 2, wetting it from bottom to top. Simultaneously, the gas outside the electrode assembly 2 inside the housing 1 and the gas inside the electrode plates of the electrode assembly 2 gradually escapes through the gap between the outer contour of the portion of the guide 3 located in the pore 121 and the inner peripheral wall of the pore 121. No electrolyte sealing phenomenon occurs during the injection and settling processes, thus preventing residual gas from accumulating in the middle of the electrode assembly and causing poor wetting in that area. Because the guide 3 has a certain degree of elasticity, it buffers the impact of the electrode assembly. During use, the battery cell inevitably experiences the electrode assembly 2 impacting the end cap assembly 12 and the housing sidewall. The highly elastic guide 3 reduces the impact of the electrode assembly 2 on the end cap assembly 12 and the housing sidewall, providing a buffering effect and preventing powder shedding from the upper part of the electrode plates due to impact damage, thereby improving the reliability of the battery cell.

[0213] In another specific embodiment, the diameter of the aperture 121 of the end cap assembly 12 is increased to 5 mm, and an elastic guide body 36 with a diameter of 3.5 mm is bonded at the aperture using AB glue (two-component mixed hardening adhesive) or an insulating adhesive. The thickness of the guide body 36 is 1 mm, and the guide body 36 can be any material with flow-guiding properties, but the material must meet the requirements of insulation and corrosion resistance. A layer of elastic plastic with a thickness of approximately 0.5 mm is pasted around the guide body 36; the plastic material includes acrylonitrile, polyamide, polypropylene, etc. Along the second direction Y, several uniform holes 331 with a diameter of 2 mm are provided on the guide 3 at a distance of 3-5 cm from the outlet 3b and facing the preset sidewall 111. When assembling the end cap assembly 12 with the electrode assembly, the guide 3 wrapped with the elastic plastic layer is placed on the side of the electrode assembly. Then, other processes in the assembly section can be carried out normally. During a single injection, the injection device is aligned with the inlet 3a of the guide member 3 for injection. The electrolyte flows along the guide member 3 to the gap between the electrode assembly 2 and the preset sidewall 111, and exits at the outlet 3b and the hole 331 of the guide member 3. Because the guide member 3 has uniformly distributed small holes facing the preset sidewall 111 at its end, and there is a gas escape gap between the outer contour of the portion of the guide member 3 in the hole 121 and the inner peripheral wall of the hole 121, the injection process is very rapid, greatly improving the injection efficiency. During the electrolyte injection process, the electrolyte flows along the gap between the electrode assembly 2 and the preset sidewall 111 towards the bottom of the electrode assembly 2, wetting it from bottom to top. Simultaneously, the gas outside the electrode assembly 2 inside the outer casing 1 and the gas inside the electrode plates of the electrode assembly 2 gradually escapes through the gap between the outer contour of the portion of the guide 3 located in the pore 121 and the inner peripheral wall of the pore 121. No electrolyte sealing phenomenon occurs during the injection and settling processes, thus preventing residual gas from accumulating in the middle of the electrode assembly and causing poor wetting in the middle. Because the guide 3 is wrapped with an elastic plastic layer, it buffers the impact of the electrode assembly. During use, the battery cell inevitably experiences the electrode assembly 2 impacting the end cap assembly 12 and the sidewall of the casing. The presence of the highly elastic guide 3 reduces the impact of the electrode assembly 2 on the end cap assembly 12 and the sidewall of the casing, providing a buffering effect and preventing powder loss from the upper part of the electrode plates due to impact damage, thereby improving the reliability of the battery cell.

[0214] In another specific embodiment, the diameter of the aperture 121 of the end cap assembly 12 is increased to 5 mm, and an elastic guide 3 with a diameter of 3.5 mm is bonded at the aperture using AB glue (two-component mixed hardening adhesive) or an insulating adhesive. The guide 3 has a thickness of 1 mm and is made of a polyurethane or other elastic material. Along the second direction Y, several uniform holes 331 with a diameter of 2 mm are provided on the guide 3 at a distance of 3-5 cm from the outlet 3b and facing the preset sidewall 111. When assembling the end cap assembly 12 with the electrode assembly 2, the guide 3 is placed on the side of the electrode assembly. Afterwards, other processes in the assembly section can be carried out normally. During the first injection, the injection device is aligned with the inlet 3a of the guide 3 to inject the electrolyte. The electrolyte flows along the guide 3 to the gap between the electrode assembly and the preset sidewall, and flows out at the outlet 3b and the holes 331 of the guide 3. Because the end of the guide 3 is provided with uniformly distributed small holes facing the preset sidewall 111, and there is a gas escape gap between the outer contour of the portion of the guide 3 in the pore 121 and the inner peripheral wall of the pore 121, the liquid injection process is very fast, greatly improving the liquid injection efficiency. During the liquid injection process, the electrolyte will flow along the gap between the electrode assembly 2 and the preset sidewall 111 to the bottom of the electrode assembly 2, and the electrolyte will wet from bottom to top. At the same time, the gas outside the electrode assembly 2 inside the shell 1 and the gas inside the electrode plate of the electrode assembly 2 will gradually escape through the gap between the outer contour of the portion of the guide 3 in the pore 121 and the inner peripheral wall of the pore 121. During the liquid injection process and the standing process, there is no electrolyte sealing phenomenon in the electrode assembly 2, so there will be no residual gas stuck in the middle of the electrode assembly, resulting in poor wetting of the middle of the electrode assembly. Since the flow guide 3 has a certain degree of elasticity, it can buffer the impact of the electrode assembly. In the process of use, the electrode assembly 2 will inevitably impact the end cap assembly 12 and the side wall of the housing. The presence of the highly elastic flow guide 3 can reduce the impact of the electrode assembly 2 on the end cap assembly 12 and the side wall of the housing, play a buffering role, and prevent the upper part of the electrode sheet of the electrode assembly 2 from being damaged by impact and causing powder to fall off, thereby improving the reliability of the battery cell.

[0215] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing includes a shell having an opening and an end cap assembly covering the opening, the end cap assembly having a hole communicating with a space inside the housing, and the shell including a predetermined sidewall. An electrode assembly is located inside the housing. The electrode assembly and the preset sidewall are arranged along a first direction, and the electrode assembly and the end cap assembly are arranged along a second direction. The first direction and the second direction are arranged intersectingly. A flow guide is provided through the pore, the flow guide having an inlet at an upstream end and an outlet at a downstream end along the flow direction, wherein there is a gap between the outer contour of the portion of the flow guide in the pore and the inner peripheral wall of the pore, and the outlet is located closer to the preset sidewall and closer to the electrode assembly than the preset sidewall along the first direction.

2. The battery cell according to claim 1, characterized in that, The flow guide includes at least a flow guide section extending along the second direction and located between the electrode assembly and the preset sidewall along the first direction.

3. The battery cell according to claim 2, characterized in that, The flow guiding component includes a first flow guiding section, a second flow guiding section, and a third flow guiding section connected in sequence. The first flow guiding section has the liquid inlet, and the third flow guiding section has the liquid outlet. The first guide section extends along the second direction and passes through the pore. The second flow guide section extends along the first direction and along the second direction, the second flow guide section is located between the electrode assembly and the end cap assembly; The third flow guide section extends along the second direction and is located between the electrode assembly and the preset sidewall along the first direction.

4. The battery cell according to any one of claims 1 to 3, characterized in that, Along the second direction, the ratio of the distance between the outlet and the first end of the electrode assembly away from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 2.

5. The battery cell according to claim 4, characterized in that, Along the second direction, the ratio of the distance between the outlet and the first end of the electrode assembly away from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 3.

6. The battery cell according to claim 2 or 3, characterized in that, The flow guide section located between the electrode assembly and the preset sidewall along the first direction has at least one hole opening toward the preset sidewall, and the hole communicates with the inner cavity of the flow guide.

7. The battery cell according to claim 6, characterized in that, Along the second direction, the ratio of the distance between the hole furthest from the outlet and the first end of the electrode assembly furthest from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 2.

8. The battery cell according to claim 7, characterized in that, Along the second direction, the ratio of the distance between the hole furthest from the outlet and the first end of the electrode assembly furthest from the end cap assembly to the length of the electrode assembly along the second direction is greater than 0 and less than or equal to 1 / 3.

9. The battery cell according to claim 3, characterized in that, Along the second direction, the second flow guide section is spaced apart from the electrode assembly; and / or Along the first direction, the third flow guide section is spaced apart from the electrode assembly.

10. The battery cell according to claim 9, characterized in that, The preset sidewall includes a first sidewall and a second sidewall, the first sidewall being connected to the second sidewall and the wall surface of the first sidewall being larger than the wall surface of the second sidewall. The third flow guide section is located between the second sidewall and the electrode assembly.

11. The battery cell according to claim 9 or 10, characterized in that, The battery cell further includes electrode terminals, a positive electrode adapter, and a negative electrode adapter. The electrode terminals are located on the side of the end cap assembly facing away from the electrode assembly along the second direction. The positive electrode adapter and the negative electrode adapter are located on the side of the end cap assembly facing the electrode assembly along the second direction. The electrode assembly includes a first electrode assembly and a second electrode assembly. Both the first and second electrode assemblies include a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to the positive electrode adapter, and the negative electrode tab is connected to the negative electrode adapter. A first gap is formed between the positive electrode adapter, the positive electrode tab of the first electrode assembly, and the positive electrode tab of the second electrode assembly, and the second current-conducting section passes through the first gap, or... A second gap is formed between the negative electrode adapter, the negative electrode tab of the first electrode assembly, and the negative electrode tab of the second electrode assembly, and the second flow guide section passes through the second gap.

12. The battery cell according to any one of claims 1 to 3, 9, and 10, characterized in that, The portion of the flow guide located in the pore is connected to the inner peripheral wall of the pore.

13. The battery cell according to claim 12, characterized in that, Along the second direction, the liquid inlet is located in the pore, or the liquid inlet is located on the side of the pore opposite to the electrode assembly along the second direction.

14. The battery cell according to any one of claims 1 to 3, 9, and 10, characterized in that, The flow guide is configured as a tube with a closed cross-section and is elastic.

15. The battery cell according to any one of claims 1 to 3, 9, and 10, characterized in that, The material of the flow guide includes any one of polyurethane, polyvinylidene fluoride, and polyamide.

16. The battery cell according to any one of claims 1 to 3, 9, and 10, characterized in that, The flow guide includes a flow guide body and a wrapping layer that covers the outer surface of the flow guide body. The flow guide body is configured as a tube with a closed cross-section, and the wrapping layer is elastic.

17. The battery cell according to claim 16, characterized in that, The encapsulation layer is made of any one of polyurethane, polyvinylidene fluoride, or polyamide.

18. The battery cell according to any one of claims 1 to 3, 9, and 10, characterized in that, The battery cell also includes a sealing component, which is used to seal the pores and the liquid inlet.

19. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 18.

20. An electrical device, characterized in that, It includes at least one battery cell as described in any one of claims 1 to 18 or at least one battery device as described in claim 19, wherein the battery cell or the battery device is used to store or provide electrical energy.

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