Battery cell, its manufacturing method and manufacturing equipment, battery, and electrical device

Abstract

The present application relates to a battery cell, a manufacturing method and manufacturing equipment thereof, a battery, and an electrical device, belonging to the technical field of battery manufacturing. The present application provides a battery cell, comprising: a housing having a first wall; an electrode assembly; a first current collector member; wherein, the first wall has a first surface facing the first current collector member, the first current collector member has a second surface facing the first wall, one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the first wall and the first current collector member; the first current collector member is provided with a first hole and a second hole, and the first hole is configured to communicate with the second hole through the gap. In this battery cell, the electrolyte can infiltrate the electrode assembly faster and more fully. The present application also provides a battery and an electrical device comprising this battery cell. The present application also provides a manufacturing method and manufacturing equipment for the battery cell.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and more particularly, to a battery cell, a manufacturing method and manufacturing equipment thereof, a battery, and an electrical device. Background Art

[0002] Currently, with the continuous prosperity of the new energy vehicle market, the power battery industry has rapidly expanded and grown, and lithium battery technology has become increasingly refined, posing higher and higher requirements for the safety performance, energy density, and industrialization requirements of battery cells.

[0003] During the assembly process of the battery cell, it is necessary to inject electrolyte into the battery cell to make the electrolyte infiltrate the electrode assembly. However, currently, the injection efficiency of the battery cell is low, and the infiltration effect of the electrode assembly is poor, resulting in a low capacitance and poor safety performance of the battery cell. Summary of the Invention

[0004] To this end, this application proposes a battery cell, a manufacturing method and manufacturing equipment thereof, a battery, and an electrical device, in which the electrolyte can infiltrate the electrode assembly faster and more fully, not only improving the injection efficiency of the battery cell, but also improving the capacitance and safety performance of the battery cell.

[0005] An embodiment of the first aspect of this application proposes a battery cell, including: a housing having a first wall; an electrode assembly disposed inside the housing, the electrode assembly having a central hole, and a first tab being provided on a side of the electrode assembly facing the first wall; a first current collector member disposed between the first wall and the electrode assembly and configured to connect the first tab and the first wall; wherein, the first wall has a first surface facing the first current collector member, the first current collector member has a second surface facing the first wall, and one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the first wall and the first current collector member; the first current collector member is provided with a first hole and a second hole, the first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap.

[0006] Since there is a gap between the first wall and the first current collector member, when injecting electrolyte into the battery cell, the electrolyte enters the central hole, enters the gap through the first hole, and then enters the first tab from the gap, thereby fully and quickly infiltrating the electrode assembly, not only improving the injection efficiency of the battery cell, but also enabling the electrolyte to more fully infiltrate the electrode assembly, improving the capacitance and safety performance of the battery cell.

[0007] According to some embodiments of this application, a plurality of the protrusions are provided, and the plurality of protrusions are spaced apart around the central hole.

[0008] In the above solution, a plurality of protrusions are arranged at intervals around the central hole, and can be uniformly abutted between the first current collector member and the first wall around the central hole.

[0009] According to some embodiments of the present application, a plurality of the second holes are provided, and the plurality of the second holes are arranged at intervals around the central hole.

[0010] In the above solution, the plurality of second holes are arranged at intervals around the central hole, and can guide the electrolyte to uniformly diffuse around the central hole so as to fully enter the first tab, thereby enabling the electrolyte to fully and quickly infiltrate the electrode assembly.

[0011] According to some embodiments of the present application, the projection of the protrusion on the first current collector member and the second hole do not overlap.

[0012] In the above solution, the position of the first current collector member where the second hole is opened and the position corresponding to the protrusion are arranged staggeredly, that is, the electrolyte can be guided to smoothly enter the second hole, and the strength of the position corresponding to the protrusion will not be reduced, and a gap can be reliably formed between the first current collector member and the first wall.

[0013] According to some embodiments of the present application, the first wall is provided with a third hole, the first current collector member includes a central portion and a peripheral portion, the peripheral portion is arranged around the central portion, the central portion protrudes from the peripheral portion in a direction away from the electrode assembly, at least a part of the central portion is inserted into the third hole, and the central portion is connected to the hole wall of the third hole.

[0014] In the above solution, at least a part of the central portion is connected to the hole wall of the third hole, and the electrical connection between the first current collector member and the first wall can be realized through the cooperation between the central portion and the third hole.

[0015] According to some embodiments of the present application, the central portion includes a top wall and a side wall, the side wall surrounds the top wall, the side wall connects the peripheral portion and the top wall, the first hole is arranged on the side wall and is communicated with the gap, and the outer peripheral surface of the side wall is connected to the hole wall of the third hole.

[0016] In the above solution, the first hole is arranged on the side wall of the central portion, and the electrolyte in the central hole enters the gap along the radial direction of the central hole through the first hole, so as to fully and quickly infiltrate the electrode assembly.

[0017] According to some embodiments of the present application, the ratio of the diameter of the central portion to the diameter of the first current collector member is greater than or equal to 0.3.

[0018] In the above solution, setting the ratio of the diameter of the central part to the diameter of the first current collector member to be greater than or equal to 0.3 can provide good current-carrying capacity when the central part is in contact with the hole wall of the third hole, and realize reliable electrical connection between the first current collector member and the first wall.

[0019] According to some embodiments of the present application, the outer shell further includes a second wall disposed opposite to the first wall. A second tab is provided on one side of the electrode assembly facing the second wall. The battery cell further includes: an electrode terminal, which is insulatively disposed on the second wall and is electrically connected to the second tab.

[0020] In the above solution, the electrode terminal is insulatively disposed on the second wall. The electrode terminal and the first wall are respectively located on opposite sides of the outer shell. The battery cell realizes electrical connection with the outside through the electrode terminal.

[0021] According to some embodiments of the present application, the battery cell further includes: a second current collector member, which is disposed between the electrode assembly and the second wall and is used to connect the second tab and the electrode terminal.

[0022] In the above solution, the second tab and the electrode terminal are connected through the second current collector member, which can simplify the structure of the electrode terminal and simplify the assembly process of electrically connecting the second tab and the electrode terminal.

[0023] According to some embodiments of the present application, the electrode terminal is provided with a liquid injection hole, and the liquid injection hole is disposed opposite to the central hole.

[0024] In the above solution, the liquid injection hole is integrally provided on the electrode terminal, which can simplify the structure of the outer shell. The liquid injection hole and the gap are respectively located on both sides of the axial direction of the central hole. After the electrolyte enters the central hole from the liquid injection hole, it can first diffuse to the electrode assembly through the central hole and then enter the electrode assembly through the gap, improving the infiltration efficiency of the electrolyte.

[0025] According to some embodiments of the present application, the battery cell further includes: a seal, which is used to seal the liquid injection hole.

[0026] In the above solution, after the electrolyte injection is completed, the liquid injection hole is sealed with a seal, which can ensure the sealing performance of the battery cell and improve the safety performance of the battery cell.

[0027] According to some embodiments of the present application, the battery cell further includes: a pressure relief part, which is disposed on the first wall and is configured to actuate when the temperature or pressure inside the battery cell reaches a threshold value to release the pressure inside the battery cell.

[0028] In the above solution, the pressure relief part is disposed on the first wall to improve the safety performance of the battery cell.

[0029] According to some embodiments of the present application, the housing includes a housing body and an end cap. The housing body has an opening, and the end cap is used to close the opening. Wherein, the first wall is the end cap.

[0030] In the above solution, the first wall is the end cap. The first current collector member is disposed between the electrode assembly and the end cap, which allows the assembled electrode assembly and the first current collector member to be first placed into the housing body, and then the end cap is used to close the opening, simplifying the assembly process of the battery cell.

[0031] An embodiment of the second aspect of the present application provides a battery, including the battery cell described in the embodiment of the first aspect of the present application.

[0032] An embodiment of the third aspect of the present application provides an electrical device, including the battery described in the embodiment of the second aspect of the present application.

[0033] An embodiment of the fourth aspect of the present application provides a manufacturing method of a battery cell, including:

[0034] Providing a housing body and an electrode terminal, the electrode terminal is insulated and installed on the housing body. The housing body has an opening, and the electrode terminal is provided with a liquid injection hole;

[0035] Providing an end cap;

[0036] Providing an electrode assembly, the electrode assembly has a central hole, and one end of the electrode assembly is provided with a first tab;

[0037] Providing a first current collector member, the first current collector member is provided with a first hole and a second hole;

[0038] Connecting the first current collector member to the first tab, placing the electrode assembly into the housing body, covering the end cap on the opening, so that the first current collector member is located between the end cap and the electrode assembly. Wherein, the end cap has a first surface facing the first current collector member, the first current collector member has a second surface facing the end cap, and one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the end cap and the first current collector member. The first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap;

[0039] Injecting electrolyte into the interior of the housing body through the liquid injection hole. The electrolyte enters the central hole, enters the gap through the first hole, and then enters the electrode assembly through the gap.

[0040] An embodiment of the fifth aspect of the present application provides a manufacturing device for a battery cell, including:

[0041] A first providing device for providing a housing and electrode terminals, the electrode terminals being insulatingly mounted on the housing, the housing having an opening, and the electrode terminals being provided with liquid injection holes;

[0042] A second providing device for providing an end cap;

[0043] A third providing device for providing an electrode assembly, the electrode assembly having a central hole, and one end of the electrode assembly being provided with a first tab;

[0044] A fourth providing device for providing a first current collecting member, the first current collecting member being provided with a first hole and a second hole;

[0045] A first assembling module for connecting the first current collecting member to the first tab, placing the electrode assembly into the housing, covering the opening with the end cap, and positioning the first current collecting member between the end cap and the electrode assembly. Wherein, the end cap has a first surface facing the first current collecting member, the first current collecting member has a second surface facing the end cap, and one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the end cap and the first current collecting member. The first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap;

[0046] A second assembling module for injecting electrolyte into the interior of the housing through the liquid injection hole, the electrolyte entering the central hole, passing through the first hole into the gap, and then entering the electrode assembly through the gap.

[0047] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0048] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0049] Figure 1 Shown is a simplified schematic diagram of a vehicle in an embodiment of the present application;

[0050] Figure 2 Shown is Figure 1 a schematic structural diagram of the battery of the vehicle in

[0051] Figure 3 The explosion diagram of a battery cell according to some embodiments of the present application is shown;

[0052] Figure 4 Shown is Figure 3 the sectional view of the battery cell in

[0053] Figure 5 Shown is Figure 4 the partial enlarged view at position A in

[0054] Figure 6 the schematic structural diagram of the protrusion provided on the first surface;

[0055] Figure 7 the schematic structural diagram of the protrusion provided on the second surface;

[0056] Figure 8 the schematic structural diagram of a first current collector member in a form of a battery cell according to some embodiments of the present application;

[0057] Figure 9 the schematic structural diagram of another form of the first current collector member in a battery cell according to some embodiments of the present application;

[0058] Figure 10 Shown is Figure 9 the schematic structural diagram of the first wall paired with that in

[0059] Figure 11 Shown is Figure 9 the state diagram of the cooperation between the first current collector member in Figure 10 and the first wall in

[0060] Figure 12 Shown is Figure 8 the schematic structural diagram of the first wall paired with the first current collector member in

[0061] Figure 13 the process flow diagram of the manufacturing method of a battery cell according to some embodiments of the present application;

[0062] Figure 14 the schematic structural diagram of the manufacturing equipment of a battery cell according to some embodiments of the present application;

[0063] The above-mentioned drawings are not provided to scale.

[0064] Icons: 1000 - Vehicle; 100 - Battery; 10 - Battery cell; 11 - Housing; 111 - First wall; 1111 - First surface; 1112 - Third hole; 112 - Second wall; 113 - Third wall; 12 - Electrode assembly; 121 - Body; 122 - First tab; 123 - Second tab; 124 - Central hole; 1241 - First end; 1242 - Second end; 13 - Electrode terminal; 131 - Liquid injection hole; 132 - Insulating ring; 14 - First current collector member; 141 - Second surface; 142 - First hole; 143 - Second hole; 144 - Central part; 1441 - Top wall; 1442 - Side wall; 14421 - First part; 14422 - Second part; 145 - Peripheral part; 15 - Second current collector member; 16 - Pressure relief part; 17 - Seal; 18 - Protrusion; 19 - Gap; 20 - Box; 21 - First box; 22 - Second box; 200 - Controller; 300 - Motor; 2000 - Manufacturing equipment for battery cells; 2100 - First providing device; 2200 - Second providing device; 2300 - Third providing device; 2400 - Fourth providing device; 2500 - First assembly module; 2600 - Second assembly module. Detailed implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of this application in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0067] Reference to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application may be combined with other embodiments.

[0068] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "attached" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] "A plurality of" as used in this application means two or more (including two).

[0070] In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of this application do not limit this. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of this application do not limit this either. Generally, the battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, prismatic battery cells and pouch battery cells.

[0071] The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. Generally, the battery includes a box for encapsulating one or more battery cells, and the box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0072] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode ear. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without fusing, the number of positive electrode ears is multiple and stacked together, and the number of negative electrode ears is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0073] The battery cell further includes a current collecting member. The current collecting member is used to electrically connect the electrode ear of the battery cell and the electrode terminal to convey electrical energy from the electrode assembly to the electrode terminal and then to the outside of the battery cell through the electrode terminal; the electrical connection between multiple battery cells is achieved through a bus bar component to achieve series connection, parallel connection, or hybrid connection of multiple battery cells.

[0074] In the related art, when injecting electrolyte into the battery cell, it is difficult for the electrolyte to diffuse after entering the inner shell. Not only is the injection time long and the injection efficiency low, but also the electrolyte cannot fully infiltrate the electrode assembly, resulting in poor electrolyte infiltration of the electrode assembly. During the charge and discharge process of the battery cell, lithium precipitation is likely to occur. The lithium crystallization will pierce the separator, causing a short circuit between the positive electrode tab and the negative electrode tab, resulting in an internal short circuit of the electrode assembly and reducing the capacitance and safety performance of the battery cell.

[0075] The inventor has found through research that the internal structure of the battery cell is usually relatively compact. The electrode assembly, the current collecting member, and the shell are in close contact with each other, which can reduce the volume of the battery cell and improve the energy density of the battery cell. Since there is no gap in the existing battery cell that can guide the rapid diffusion of the electrolyte, the electrolyte diffuses through the gap between two closely contacted components after entering the inner shell. The diffusion speed of the electrolyte is slow and uneven, resulting in low injection efficiency of the battery cell and poor infiltration effect of the electrode assembly.

[0076] Based on the above idea, the present application proposes a new technical solution, in which the electrolyte can infiltrate the electrode assembly faster and more fully, thereby not only improving the liquid injection efficiency of the battery cell, but also enabling the electrolyte to infiltrate the electrode assembly more fully, improving the capacitance and safety performance of the battery cell.

[0077] It can be understood that the battery cell described in the embodiments of the present application can directly supply power to the electrical device, or can form a battery by means of parallel connection or series connection, and supply power to various electrical devices in the form of a battery.

[0078] It can be understood that the electrical devices applicable to the battery cell, battery module or battery described in the embodiments of the present application can be in various forms. For example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys and electric tools, etc. For example, spacecrafts include airplanes, rockets, space shuttles and spaceships, etc. Electric toys include fixed or mobile electric toys. For example, game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools. For example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators and electric planers.

[0079] The battery cell and battery described in the embodiments of the present application are not only limited to the electrical devices described above, but also applicable to all electrical devices using the battery cell and battery. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as an example.

[0080] Figure 1 Shown is a simplified schematic diagram of a vehicle in an embodiment of the present application; Figure 2 Shown is Figure 1 the structural schematic diagram of the battery of the vehicle in

[0081] As Figure 1 shown, a battery 100, a controller 200 and a motor 300 are arranged inside the vehicle 1000. For example, the battery 100 can be arranged at the bottom, the front or the rear of the vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.

[0082] In some embodiments of the present application, the battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The controller 200 is used to control the power supply of the battery 100 to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0083] In other embodiments, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] The battery 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. Among them, multiple battery cells 10 can be directly connected in series, parallel or in a mixed connection to form the battery 100. The mixed connection means that there are both series and parallel connections among multiple battery cells 10. Multiple battery cells 10 can also be first connected in series, parallel or in a mixed connection to form battery modules, and then multiple battery modules are connected in series, parallel or in a mixed connection to form the battery 100.

[0085] As Figure 2 shown, the battery 100 includes multiple battery cells 10 and a box body 20, and the multiple battery cells 10 are placed in the box body 20. The box body 20 includes a first box body 21 and a second box body 22. After the first box body 21 and the second box body 22 are covered with each other, a battery cavity is formed, and the multiple battery cells 10 are placed in the battery cavity. Among them, the shapes of the first box body 21 and the second box body 22 can be determined according to the shape of the combination of multiple battery cells 10, and the first box body 21 and the second box body 22 can both have an opening. For example, both the first box body 21 and the second box body 22 can be hollow cuboids and each has only one open face. The openings of the first box body 21 and the second box body 22 are arranged oppositely, and the first box body 21 and the second box body 22 are buckled with each other to form the box body 20 with a closed chamber. Multiple battery cells 10 are connected in parallel, series or in a mixed connection with each other and then placed in the box body 20 formed after the first box body 21 and the second box body 22 are buckled.

[0086] Figure 3 The figure shows an exploded view of a battery cell in some embodiments of the present application; Figure 4 The figure shows Figure 3 the cross-sectional view of the battery cell in

[0087] As Figure 3 and Figure 4 shown, the battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13, a first current collector member 14, a second current collector member 15, a pressure relief portion 16 and a seal 17.

[0088] The housing 11 includes a first wall 111, a second wall 112 and a third wall 113. The first wall 111 and the third wall 113 are arranged oppositely, and the second wall 112 connects the first wall 111 and the third wall 113.

[0089] Specifically, the outer casing 11 includes a housing and an end cap. The housing has an opening, and the end cap is used to close the opening so as to enclose the electrode assembly 12 inside the outer casing 11.

[0090] In some embodiments of the present application, the first wall 111 is the end cap, the second wall 112 and the third wall 113 are integrally formed as the housing, and the third wall 113 is the bottom wall of the housing.

[0091] In other embodiments, it may also be that the first wall 111 and the second wall 112 are integrally formed as the housing, the first wall 111 is the bottom wall of the housing, and the third wall 113 is the end cap.

[0092] The housing can be cylindrical or elliptical cylindrical, or can be square. The housing can be made of a metal material, such as aluminum, aluminum alloy or nickel-plated steel. The end cap is a plate-like structure, and the size and shape of the end cap match the opening of the housing. The end cap is fixed to the opening of the housing, thereby enclosing the electrode assembly 12 and the electrolyte in the accommodation cavity of the housing. The end cap is made of a metal material, such as materials like aluminum and steel.

[0093] In some embodiments of the present application, the housing is a cylinder, the axial direction of the housing extends along the first axis P, the radial direction extends along the first direction R, the first axis P and the first direction R are perpendicular to each other, the end cap is a circular plate structure, and the first wall 111 and the second wall 112 are respectively arranged on opposite sides of the first axis P.

[0094] In other embodiments, the housing can also be square, and the end cap is a square or rectangular plate-like structure.

[0095] The electrode assembly 12 is arranged inside the outer casing 11. The electrode assembly 12 includes a main body 121, a first tab 122 and a second tab 123. The main body 121 includes a positive electrode plate, a negative electrode plate and a separator. The separator is located between the positive electrode plate and the negative electrode plate and is used to separate the positive electrode plate and the negative electrode plate. Among them, the electrode assembly 12 is formed by winding, the central hole 124 is the winding center of the electrode assembly 12, and the central hole 124 penetrates the main body 121 along the first axis P. Along the extension direction of the first axis P, one end of the central hole 124 is correspondingly arranged with the first wall 111, and the other end is arranged with the second wall 112.

[0096] Along the first axis P, the first tab 122 and the second tab 123 are respectively located on both sides of the main body 121. The first tab 122 is correspondingly arranged with the first current collector member 14, and the second tab 123 is correspondingly arranged with the second current collector member 15. Among the first tab 122 and the second tab 123, the first tab 122 is the negative tab, and the second tab 123 is the positive tab. Wherein, the material of the current collector member corresponding to the first tab 122 is copper, and the material of the current collector member corresponding to the second tab 123 is aluminum. The first current collector member 14 is arranged between the first wall 111 and the first tab 122, and the first tab 122 and the first wall 111 are electrically connected through the first current collector member 14. The electrode terminal 13 is insulated and arranged on the second wall 112 through the insulating ring 132, the second current collector member 15 is arranged between the second wall 112 and the second tab 123, and the second tab 123 and the electrode terminal 13 are electrically connected through the second current collector member 15.

[0097] The thickness directions of both the first current collector member 14 and the second current collector member 15 extend along the first axis P. The size and shape of the first current collector member 14 may match the electrode assembly 12, or may not match the size and shape of the electrode assembly 12. The size and shape of the second current collector member 15 may match the electrode assembly 12, or may not match the size and shape of the electrode assembly 12.

[0098] Taking the first current collector member 14 as an example, in some embodiments of the present application, the battery cell 10 is cylindrical, the electrode assembly 12 is a cylindrical wound body, and the first current collector member 14 is a circular plate-like structure with the axis being the first axis P. In other embodiments, the battery cell 10 may also be a square shell battery 100, the electrode assembly 12 is hexahedral or elliptical, and the first current collector member 14 is a square plate-like structure with the thickness direction extending along the first axis P.

[0099] The pressure relief portion 16 is configured to be actuated when the temperature or pressure inside the battery cell 10 reaches a threshold value to release the pressure inside the battery cell 10.

[0100] In some embodiments of the present application, the pressure relief portion 16 is arranged on the first wall 111, that is, the pressure relief portion 16 and the electrode terminal 13 are respectively arranged on both sides of the outer shell 11 along the first axis P to reasonably utilize the surface space of the outer shell 11.

[0101] In other embodiments, the pressure relief portion 16 may also be arranged on the second wall 112, that is, the pressure relief portion 16 and the electrode terminal 13 are arranged on the same side.

[0102] The battery cell 10 is also provided with a liquid injection hole 131 for injecting electrolyte into the interior of the housing 11, and a seal 17 for closing the liquid injection hole 131 after the injection is completed. Among them, the liquid injection hole 131 can be sealed by a riveting process, and the seal 17 is formed after riveting; the seal 17 can also be an elastic member made of rubber, silica gel, etc., and the elastic member is inserted into the liquid injection hole 131 to close the liquid injection hole 131.

[0103] In some embodiments of the present application, the liquid injection hole 131 is provided on the electrode terminal 13, the liquid injection hole 131 is disposed opposite to the central hole 124, and the electrolyte enters one end of the central hole 124 from the liquid injection hole 131 and then diffuses from the other end of the central hole 124 to the electrode assembly 12.

[0104] In other embodiments, the liquid injection hole 131 can also be provided on the second wall 112 or the first wall 111.

[0105] Figure 5 What is shown is Figure 4 a partial enlarged view of part A in; Figure 6 a schematic structural view of the protrusion provided on the first surface; Figure 7 a schematic structural view of the protrusion provided on the second surface;

[0106] As Figure 5 and Figure 6 shown, some embodiments of the present application provide a battery cell 10, including a housing 11, an electrode assembly 12, and a first current collector member 14. The housing 11 has a first wall 111, the electrode assembly 12 is disposed inside the housing 11, the electrode assembly 12 has a central hole 124, a first tab 122 is provided on a side of the electrode assembly 12 facing the first wall 111, and the first current collector member 14 is disposed between the first wall 111 and the electrode assembly 12 and is used to connect the first tab 122 and the first wall 111. Among them, the first wall 111 has a first surface 1111 facing the first current collector member 14, the first current collector member 14 has a second surface 141 facing the first wall 111, and a protrusion 18 is provided on one of the first surface 1111 and the second surface 141, and the other is in contact with the protrusion 18 to form a gap 19 between the first wall 111 and the first current collector member 14; the first current collector member 14 is provided with a first hole 142 and a second hole 143, the first hole 142 is disposed opposite to the central hole 124, the second hole 143 is disposed opposite to the first tab 122, and the first hole 142 is configured to communicate with the second hole 143 through the gap 19.

[0107] Along the first axis P, the two ends of the central hole 124 are the first end 1241 and the second end 1242 respectively. Both the first current collector member 14 and the first wall 111 are located at the first end 1241 of the central hole 124. The first wall 111 can be an end cap or the bottom wall of the housing; the first current collector member 14 can be electrically connected to the first wall 111 in a form of direct abutment or can be connected through a concave-convex fitting structure to achieve electrical connection.

[0108] As Figure 6 shown, in some embodiments of the present application, the protrusion 18 can be disposed on the first surface 1111, and the top surface of the protrusion 18 abuts against the second surface 141 to form a gap 19 between the first wall 111 and the first current collector member 14; as Figure 7 shown, in some other embodiments of the present application, the protrusion 18 can also be disposed on the second surface 141, and the top surface of the protrusion 18 abuts against the first surface 1111 to form a gap 19 between the first wall 111 and the first current collector member 14.

[0109] The number of the protrusions 18 can be one. One protrusion 18 abuts between the first surface 1111 and the second surface 141 to form a gap 19 between the first wall 111 and the first current collector member 14; the number of the protrusions 18 can also be multiple. The heights of the multiple protrusions 18 (i.e., the dimensions in the direction of the first axis P) are the same. The multiple protrusions 18 jointly abut between the first surface 1111 and the second surface 141 to form a gap 19 between the first wall 111 and the first current collector member 14. Based on the embodiment in which there are multiple protrusions 18, all the multiple protrusions 18 can be disposed on the first surface 1111 or the second surface 141, or some of the protrusions 18 can be disposed on both the first surface 1111 and the second surface 141.

[0110] The shape of the protrusion 18 can be triangular, circular, arc-shaped, etc.; the arrangement manner of the protrusions 18 can be annular array, square array, triangular array, etc.

[0111] The relative setting of the first hole 142 and the central hole 124 means that the electrolyte can enter the first hole 142 from the first end 1241 of the central hole 124. The axial direction of the first hole 142 can coincide with or be approximately coincident with the axial direction of the central hole 124. When the electrolyte enters the first hole 142 from the first end 1241 of the central hole 124, the flow direction hardly changes; the axial direction of the first hole 142 can also be perpendicular or approximately perpendicular to the axial direction of the central hole 124. When the electrolyte enters the first hole 142 from the first end 1241 of the central hole 124, the flow direction significantly changes.

[0112] There can be only one first hole 142, and all the electrolyte in the central hole 124 enters the gap 19 from one first hole 142; there can also be multiple first holes 142, and the multiple first holes 142 are spaced around the first axis P, and the electrolyte in the central hole 124 enters the multiple first holes 142 at the same time, and then diffuses along the first direction R.

[0113] The second hole 143 is arranged relative to the first electrode tab 122, which means that on a plane perpendicular to the first axis P, the second hole 143 falls within the projection range of the first electrode tab 122, and the electrolyte can flow out of the second hole 143 and enter the first electrode tab 122, and then enter the electrode assembly 12.

[0114] There can be one second hole 143, and all the electrolyte in the gap 19 enters the first electrode tab 122 from the second hole 143; there can also be multiple second holes 143, and the multiple second holes 143 are spaced around the first axis P. The electrolyte in the gap 19 enters the multiple second holes 143 at the same time to evenly and quickly infiltrate the electrode assembly 12.

[0115] Since there is a gap 19 between the first wall 111 and the first current collecting member 14, when the battery cell 10 is injected with electrolyte, the electrolyte enters the central hole 124, enters the gap 19 through the first hole 142, and then enters the first electrode tab 122 from the gap 19, thereby fully and quickly infiltrating the electrode assembly 12, which not only improves the injection efficiency of the battery cell 10, but also improves the capacity and safety performance of the battery cell 10.

[0116] Figure 8 FIG. 1 is a schematic structural diagram of a first current collecting member in a form of a battery cell according to some embodiments of the present application.

[0117] like Figure 8 As shown, in some embodiments of the present application, a plurality of protrusions 18 are provided, and the plurality of protrusions 18 are spaced apart around the central hole 124 .

[0118] Specifically, the plurality of protrusions 18 are spaced apart around the first axis P. The plurality of protrusions 18 may all be located on the same circumference around the first axis P; for example, Figure 8 As shown, there are four protrusions 18, which are arranged in a ring shape around the first axis P. The multiple protrusions 18 can also be arranged in multiple ring arrays along the first direction R. For example, there are eight protrusions 18, of which four protrusions 18 are arranged in a ring shape around the first axis P, and the other four protrusions 18 are arranged on the outer ring of the four protrusions 18, also in a ring shape.

[0119] In the above solution, the plurality of protrusions 18 are spaced apart around the central hole 124 and can be evenly abutted between the first current collecting member 14 and the first wall 111 around the central hole 124 .

[0120] like Figure 8 As shown, in some embodiments of the present application, a plurality of second holes 143 are provided, and the plurality of second holes 143 are spaced apart around the central hole 124 .

[0121] The second holes 143 may be in a triangular, circular, arc-shaped, etc. A plurality of second holes 143 are arranged around the first axis P at intervals.

[0122] The plurality of second holes 143 may all be located on the same circumference around the first axis P; for example, Figure 8 As shown, four second holes 143 are provided, and the four second holes 143 are arranged in a ring around the first axis P. The plurality of second holes 143 can also be arranged in a plurality of ring arrays along the first direction R. For example, eight second holes 143 are provided, of which four second holes 143 are arranged in a ring array around the first axis P, and the other four second holes 143 are provided on the outer ring of the four second holes 143, also arranged in a ring array.

[0123] In the above solution, the plurality of second holes 143 are spaced apart around the central hole 124 , which can guide the electrolyte to diffuse evenly around the central hole 124 so as to fully enter the first electrode tab 122 , thereby allowing the electrolyte to fully and quickly infiltrate the electrode assembly 12 .

[0124] like Figure 8 As shown, in some embodiments of the present application, the projection of the protrusion 18 on the first current collecting member 14 does not overlap with the second hole 143 .

[0125] Specifically, on a plane perpendicular to the first axis P, the projections of the protrusion 18 and the second hole 143 do not overlap.

[0126] The protrusion 18 and the second hole 143 may be spaced apart along the first direction R, or the protrusion 18 and the second hole 143 may be spaced apart around the first axis P. For example, Figure 8 As shown, in some embodiments of the present application, the number of protrusions 18 and the second holes 143 are the same and correspond one to one, and each protrusion 18 is located on the outside of the corresponding second hole 143, that is, on the side away from the first axis P along the first direction R.

[0127] In the above scheme, the first current collecting member 14 is staggered at the portion where the second hole 143 is opened and the portion corresponding to the protrusion 18, so that the electrolyte can be guided smoothly into the second hole 143 without reducing the strength of the portion corresponding to the protrusion 18, and a gap 19 is reliably formed between the first current collecting member 14 and the first wall 111.

[0128] Figure 9Shown is a schematic structural view of yet another form of the first current collector member in a battery cell of some embodiments of the present application; Figure 10 Shown is Figure 9 a schematic structural view of the first wall arranged in pair with Figure 11 Shown is Figure 9 the state diagram of the cooperation between the first current collector member in Figure 10 and the first wall in

[0129] As Figure 9 , Figure 10 and Figure 11 shown, in some embodiments of the present application, the first wall 111 is provided with a third hole 1112, the first current collector member 14 includes a central portion 144 and a peripheral portion 145, the peripheral portion 145 is arranged around the central portion 144, the central portion 144 protrudes from the peripheral portion 145 in a direction away from the electrode assembly 12, at least a part of the central portion 144 is inserted into the third hole 1112, and the central portion 144 is connected to the hole wall of the third hole 1112.

[0130] The shape of the third hole 1112 can be triangular, square, circular, oval, etc., and the part of the central portion 144 inserted into the third hole 1112 matches the shape of the third hole 1112. For example, in some embodiments of the present application, the central portion 144 is cylindrical and the third hole 1112 is a circular hole.

[0131] The central portion 144 and the hole wall of the third hole 1112 can be connected by welding, which can ensure the sealing performance of the battery cell 10 while ensuring the current-carrying capacity between the first current collector member 14 and the first wall 111. The second hole 143 and the protrusion 18 are both arranged on the peripheral portion 145, and the peripheral portion 145 is used to connect with the first tab 122.

[0132] The axial direction of the third hole 1112 can be arranged to coincide with the first axis P, that is, the central hole 124 and the first hole 142 are concentric, so that the center of gravity of the battery cell 10 is located on the first axis P, which is beneficial to the stable placement of the battery cell 10; the axial direction of the third hole 1112 can also be arranged to deviate from the first axis P to reasonably utilize the space inside the battery cell 10.

[0133] In the above solution, at least a part of the central portion 144 is connected to the hole wall of the third hole 1112, and the electrical connection between the first current collector member 14 and the first wall 111 can be realized through the cooperation between the central portion 144 and the third hole 1112.

[0134] As Figure 9 , Figure 10 and Figure 11As shown, in some embodiments of the present application, the central portion 144 includes a top wall 1441 and a side wall 1442. The side wall 1442 surrounds the top wall 1441. The side wall 1442 connects the surrounding portion 145 and the top wall 1441. The first hole 142 is provided in the side wall 1442 and communicates with the gap 19. The outer peripheral surface of the side wall 1442 is connected to the hole wall of the third hole 1112.

[0135] The outer peripheral surface of the side wall 1442 refers to the outer peripheral surface of the central portion 144 around the first axis P.

[0136] The side wall 1442 includes a first portion 14421 and a second portion 14422 connected along the first axis P. The first portion 14421 is connected to the surrounding portion 145. One end of the second portion 14422 is connected to the first portion 14421, and the other portion is connected to the top wall 1441. The first portion 14421 communicates with the gap 19. The second portion 14422 is connected to the hole wall of the third hole 1112. The first hole 142 is provided in the side wall 1442.

[0137] The normal direction of the top wall 1441 extends along the first axis P. The normal direction of the side wall 1442 may extend along the first direction R, and the axial direction of the first hole 142 extends along the first direction R. The normal direction of the side wall 1442 may also be inclined with respect to both the first direction R and the first axis P, and the axial direction of the first hole 142 extends along the normal direction of the side wall 1442.

[0138] The diameters of the first portion 14421 and the second portion 14422 may be the same, and the length of the second portion 14422 along the first axis P is limited by the height of the protrusion 18. The diameter of the first portion 14421 may also be greater than the diameter of the second portion 14422, and a step is formed at the connection between the first portion 14421 and the second portion 14422 to limit the length of the second portion 14422 along the first axis P.

[0139] In the above solution, the first hole 142 is provided in the side wall 1442 of the central portion 144. The electrolyte in the central hole 124 enters the gap 19 along the radial direction of the central hole 124 through the first hole 142 to fully and quickly infiltrate the electrode assembly 12.

[0140] In some embodiments of the present application, the ratio of the diameter of the central portion 144 to the diameter of the first current collector member 14 is greater than or equal to 0.3.

[0141] As Figure 9 and Figure 10 shown, the central portion 144 is cylindrical, the first current collector member 14 is disc-shaped, the central axis of the central portion 144 coincides with or is parallel to the first axis P, and the central axis of the first current collector member 14 coincides with the central portion 144.

[0142] In the above solution, setting the ratio of the diameter of the central portion 144 to the diameter of the first current collector member 14 to be greater than or equal to 0.3 can provide good current-carrying capacity when the central portion 144 is in contact with the hole wall of the third hole 1112, realizing a reliable electrical connection between the first current collector member 14 and the first wall 111.

[0143] In other embodiments, the central portion 144 can also be a cube, a cuboid, an elliptical cylinder, etc.

[0144] Figure 12 The shown and Figure 8 Structural schematic diagram of the first wall paired with the first current collector member in

[0145] Such as Figure 8 And Figure 12 As shown in Figure 5 and

[0146] In other embodiments, the first current collector member 14 can also be a flat plate structure, and the first current collector member 14 and the first wall 111 are in contact through the protrusion 18 to achieve electrical connection (as shown in Figure 3 and Figure 4 The top surface area of the protrusion 18 (i.e., the contact area with the first surface 1111 or the second surface 141) accounts for more than 0.05 of the area of the first current collector member 14 (i.e., the projected area on the plane perpendicular to the first axis P).

[0147] Based on the above-described embodiment where the first wall 111 is an end cap, the second wall 112 is the bottom wall of the housing. The second wall 112 is provided with an electrode lead-out hole, and an insulating isolation is provided between the outer peripheral surface of the electrode terminal 13 and the hole wall of the electrode lead-out hole through an insulating ring 132.

[0148] In the above solution, the electrode terminal 13 is insulatingly arranged on the second wall 112. The electrode terminal 13 and the first wall 111 are respectively located on opposite sides of the housing 11, and the battery cell 10 is electrically connected to the outside through the electrode terminal 13.

[0149] Such as Figure 3 and Figure 4 As shown in

[0150] In the above solution, the second tab 123 is connected to the electrode terminal 13 through the second current collector member 15, which can simplify the structure of the electrode terminal 13 and simplify the assembly process of the electrical connection between the second tab 123 and the electrode terminal 13.

[0151] As Figure 3 and Figure 4 shown, in some embodiments of the present application, the electrode terminal 13 is provided with a liquid injection hole 131, and the liquid injection hole 131 is disposed opposite to the central hole 124.

[0152] Specifically, the liquid injection hole 131 is disposed opposite to the second end 1242 of the central hole 124. The electrolyte can enter the interior of the battery cell 10 from the liquid injection hole 131 and then enter the central hole 124 from the second end 1242 of the second hole 143.

[0153] In the above solution, the liquid injection hole 131 is integrally provided on the electrode terminal 13, which can simplify the structure of the outer casing 11. The liquid injection hole 131 and the gap 19 are respectively located on both sides of the axial direction of the central hole 124. After the electrolyte enters the central hole 124 from the liquid injection hole 131, it can first diffuse to the electrode assembly 12 through the central hole 124 and then enter the electrode assembly 12 through the gap 19, improving the infiltration efficiency of the electrolyte.

[0154] As Figure 3 and Figure 4 shown, in some embodiments of the present application, the battery cell 10 further includes a seal 17 for closing the liquid injection hole 131.

[0155] In the above solution, after the electrolyte injection is completed, the liquid injection hole 131 is closed by the seal 17, which can ensure the sealing performance of the battery cell 10 and improve the safety performance of the battery cell 10.

[0156] As Figure 3 and Figure 4 shown, in some embodiments of the present application, the battery cell 10 further includes a pressure relief portion 16 provided on the first wall 111. The pressure relief portion 16 is configured to be actuated when the temperature or pressure inside the battery cell 10 reaches a threshold value to release the pressure inside the battery cell 10.

[0157] The pressure relief portion 16 can be an explosion-proof film, which can be formed by providing a weak area on the first wall 111. In some embodiments of the present application, a recess is provided on the first surface 1111 of the first wall 111, and the recess is annular around the first axis P.

[0158] In the above solution, the pressure relief portion 16 is provided on the first wall 111 to improve the safety performance of the battery cell 10.

[0159] As Figure 3 and Figure 4As shown, in some embodiments of the present application, the outer casing 11 includes a housing and an end cap. The housing has an opening, and the end cap is used to close the opening. Among them, the first wall 111 is the end cap.

[0160] In the above solution, the first wall 111 is the end cap. The first current collector member 14 is disposed between the electrode assembly 12 and the end cap, which allows the assembled electrode assembly 12 and the first current collector member 14 to be first placed into the housing, and then the end cap is used to close the opening, simplifying the assembly process of the battery cell 10.

[0161] Some embodiments of the present application propose a battery 100, including a battery cell 10.

[0162] Some embodiments of the present application propose an electrical device, including a battery 100.

[0163] Figure 13 Shown is a process flow diagram of a manufacturing method of a battery cell according to some embodiments of the present application.

[0164] As Figure 13 shown, some embodiments of the present application propose a manufacturing method of a battery cell, including:

[0165] S100: Provide a housing and an electrode terminal 13. The electrode terminal 13 is insulatingly installed on the housing. The housing has an opening, and the electrode terminal 13 is provided with a liquid injection hole 131;

[0166] S200: Provide an end cap;

[0167] S300: Provide an electrode assembly 12. The electrode assembly 12 has a central hole 124, and one end of the electrode assembly 12 is provided with a first tab 122;

[0168] S400: Provide a first current collector member 14. The first current collector member 14 is provided with a first hole 142 and a second hole 143;

[0169] S500: Connect the first current collector member 14 with the first tab 122, place the electrode assembly 12 into the housing, cover the end cap on the opening, so that the first current collector member 14 is located between the end cap and the electrode assembly 12. Among them, the end cap has a first surface 1111 facing the first current collector member 14, the first current collector member 14 has a second surface 141 facing the end cap, and one of the first surface 1111 and the second surface 141 is provided with a protrusion 18, and the other is in contact with the protrusion 18 to form a gap 19 between the end cap and the first current collector member 14. The first hole 142 and the central hole 124 are oppositely arranged, the second hole 143 and the first tab 122 are oppositely arranged, and the first hole 142 is configured to communicate with the second hole 143 through the gap 19;

[0170] S600: Inject electrolyte into the interior of the housing through the liquid injection hole 131. The electrolyte enters the central hole 124, passes through the first hole 142 into the gap 19, and then enters the electrode assembly 12 through the gap 19.

[0171] Figure 14 The figure shows a schematic structural diagram of a manufacturing apparatus for battery cells according to some embodiments of the present application.

[0172] As Figure 14 shown, a manufacturing apparatus 2000 for a battery cell according to some embodiments of the present application includes:

[0173] A first providing device 2100 for providing a housing and an electrode terminal 13. The electrode terminal 13 is insulatingly mounted on the housing. The housing has an opening, and the electrode terminal 13 is provided with a liquid injection hole 131.

[0174] A second providing device 2200 for providing an end cap.

[0175] A third providing device 2300 for providing an electrode assembly 12. The electrode assembly 12 has a central hole 124, and one end of the electrode assembly 12 is provided with a first tab 122.

[0176] A fourth providing device 2400 for providing a first current collector member 14. The first current collector member 14 is provided with a first hole 142 and a second hole 143.

[0177] A first assembling module 2500 for connecting the first current collector member 14 to the first tab 122, placing the electrode assembly 12 into the housing, covering the opening with the end cap, and making the first current collector member 14 located between the end cap and the electrode assembly 12. Wherein, the end cap has a first surface 1111 facing the first current collector member 14, the first current collector member 14 has a second surface 141 facing the end cap, and one of the first surface 1111 and the second surface 141 is provided with a protrusion 18, and the other abuts against the protrusion 18 to form a gap 19 between the end cap and the first current collector member 14. The first hole 142 and the central hole 124 are oppositely arranged, the second hole 143 and the first tab 122 are oppositely arranged, and the first hole 142 is configured to communicate with the second hole 143 through the gap 19.

[0178] A second assembling module 2600 for injecting electrolyte into the interior of the housing through the liquid injection hole 131. The electrolyte enters the central hole 124, passes through the first hole 142 into the gap 19, and then enters the electrode assembly 12 through the gap 19.

[0179] As Figures १ to १४As shown in the figure, some embodiments of the present application provide a battery cell 10, which includes a housing 11, an electrode assembly 12, an electrode terminal 13, a first current collector member 14, a second current collector member 15, a pressure relief portion 16, a seal 17, and an insulating ring 132. Among them, the first current collector member 14 is a negative current collector plate, and the second current collector member 15 is a positive current collector plate. The housing 11 includes a housing body and an end cover. The end cover is the first wall 111, and the bottom wall of the housing body is the second wall 112. The first wall 111 and the second wall 112 are disposed opposite to each other along the first axis P. The electrode terminal 13 is disposed on the second wall 112 through the insulating ring 132. The electrode assembly 12 has a central hole 124 extending along the first axis P. Along the first axis P, two ends of the electrode assembly 12 are respectively provided with a first tab 122 and a second tab 123. The first tab 122 is electrically connected to the first wall 111 through the first current collector member 14, and the second tab 123 is electrically connected to the electrode terminal 13 through the second current collector member 15. The electrode terminal 13 is provided with a liquid injection hole 131, and the liquid injection hole 131 is disposed opposite to the central hole 124. The first wall 111 has a first surface 1111 facing the first current collector member 14, and the first current collector member 14 has a second surface 141 facing the first wall 111. One of the first surface 1111 and the second surface 141 is provided with a protrusion 18, and the other is in contact with the protrusion 18 to form a gap 19 between the first wall 111 and the first current collector member 14; the first current collector member 14 is provided with a first hole 142 and a second hole 143. The first hole 142 is disposed opposite to the central hole 124, and the second hole 143 is disposed opposite to the first tab 122. The first hole 142 is configured to communicate with the second hole 143 through the gap 19.

[0180] As Figure 6 shown, in some embodiments of the present application, the protrusion 18 is disposed on the first surface 1111 of the first wall 111; as Figure 7 shown, in some other embodiments of the present application, the protrusion 18 is disposed on the second surface 141 of the first current collector member 14.

[0181] As Figure 8 and Figure 12 shown, in some embodiments of the present application, the first current collector member 14 has a flat plate structure. The first hole 142 is disposed at the center of the first current collector member 14, and the axis of the first hole 142 is parallel or coincides with the first axis P. The first current collector member 14 is in contact with the first wall 111 through the top surface of the protrusion 18, not only forming the gap 19, but also realizing the electrical connection between the two. The area of the top surface of the protrusion 18 (i.e., the contact area with the first surface 1111 or the second surface 141) accounts for more than 0.05 of the area of the first current collector member 14 (i.e., the projected area on the plane perpendicular to the first axis P) to ensure the current-carrying capacity between the first current collector member 14 and the first wall 111.

[0182] During liquid injection, the electrolyte enters the first end 1241 of the central hole 124 from the liquid injection hole 131, enters the first hole 142 from the second end 1242 of the central hole 124 with almost no change in the flow direction, enters the gap 19 from the first hole 142, and then enters the first tab 122 from the second hole 143 to fully and quickly infiltrate the electrode assembly 12.

[0183] As Figure 9 , Figure 10 and Figure 11 shown, in some other embodiments of the present application, the first wall 111 is provided with a third hole 1112. The first current collector member 14 includes a central portion 144 and a peripheral portion 145. The peripheral portion 145 is disposed around the central portion 144, and the central portion 144 protrudes from the peripheral portion 145 in a direction away from the electrode assembly 12. The central portion 144 includes a top wall 1441 and a side wall 1442. The side wall 1442 surrounds the top wall 1441. The side wall 1442 connects the peripheral portion 145 and the top wall 1441. At least a part of the central portion 144 is inserted into the third hole 1112, and the outer peripheral surface of the side wall 1442 is welded to the hole wall of the third hole 1112 by a seam welding process. Under the abutting action of the protrusion 18, a part of the side wall 1442 is exposed in the gap 19, and a first hole 142 is formed in this part. The ratio of the diameter of the central portion 144 to the diameter of the first current collector member 14 is greater than or equal to 0.3 to ensure the current-carrying capacity of the first current collector member 14 and the first wall 111.

[0184] During liquid injection, the electrolyte enters the first end 1241 of the central hole 124 from the liquid injection hole 131, enters the first hole 142 from the second end 1242 of the central hole 124, enters the gap 19 from the first hole 142, and the flow direction changes from along the first axis P to along the first direction R, and then enters the first tab 122 from the second hole 143 to fully and quickly infiltrate the electrode assembly 12.

[0185] In the battery cell 10 of the embodiment of the present application, a first hole 142 and a second hole 143 are formed on the first current collector member 14, and a protrusion 18 is formed on the first current collector member 14 or the first wall 111. The gap 19 is formed by the protrusion 18 to provide a channel for electrolyte diffusion, which can effectively improve the problem of poor electrolyte infiltration in the existing design. This improvement method only needs to make a simple improvement on the existing first current collector member 14 or the first wall 111, with low cost and easy implementation, and can significantly improve the infiltration effect of the electrode assembly 12. It not only improves the liquid injection efficiency of the battery cell 10, but also improves the capacitance and safety performance of the battery cell 10.

[0186] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0187] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a first wall; An electrode assembly disposed inside the housing, the electrode assembly having a central hole, and a first tab provided on a side of the electrode assembly facing the first wall; A first current collector member disposed between the first wall and the electrode assembly and configured to connect the first tab and the first wall; Wherein, the first wall has a first surface facing the first current collector member, the first current collector member has a second surface facing the first wall, and one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the first wall and the first current collector member; The first current collector member is provided with a first hole and a second hole, the first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap.

2. The battery cell according to claim 1, wherein There are a plurality of the protrusions, and the plurality of protrusions are spaced around the central hole.

3. The battery cell according to claim 1, characterized in that, There are a plurality of the second holes, and the plurality of second holes are spaced around the central hole.

4. The battery cell according to claim 1, characterized in that, The projection of the protrusion on the first current collector member and the second hole do not overlap.

5. The battery cell according to claim 1, wherein The first wall is provided with a third hole, the first current collector member includes a central portion and a peripheral portion, the peripheral portion surrounds the central portion, the central portion protrudes from the peripheral portion in a direction away from the electrode assembly, at least a part of the central portion is inserted into the third hole, and the central portion is connected to the hole wall of the third hole.

6. The battery cell according to claim 5, characterized in that, The central portion includes a top wall and a side wall, the side wall surrounds the top wall, the side wall connects the peripheral portion and the top wall, the first hole is disposed on the side wall and communicates with the gap, and the outer peripheral surface of the side wall is connected to the hole wall of the third hole.

7. The battery cell according to claim 5, characterized in that, The ratio of the diameter of the central portion to the diameter of the first current collector member is greater than or equal to 0.

3.

8. The battery cell according to any one of claims 1-7, characterized in that, The housing further includes a second wall disposed opposite to the first wall, a second tab is provided on a side of the electrode assembly facing the second wall, and the battery cell further includes: An electrode terminal insulatedly disposed on the second wall and electrically connected to the second tab.

9. The battery cell according to claim 8, wherein The battery cell further includes: A second current collector member disposed between the electrode assembly and the second wall and configured to connect the second tab and the electrode terminal.

10. The battery cell according to claim 8, characterized in that, The electrode terminal is provided with a liquid injection hole, and the liquid injection hole is disposed opposite to the central hole.

11. The battery cell according to claim 10, wherein, The battery cell further includes: A seal for closing the liquid injection hole.

12. The battery cell according to any one of claims 1-7, characterized in that, The battery cell further includes:

13. The battery cell according to any one of claims 1-7, characterized in that, A pressure relief portion disposed on the first wall, the pressure relief portion is configured to be actuated when the temperature or pressure inside the battery cell reaches a threshold value to release the pressure inside the battery cell.

14. A battery, characterized in that, The housing includes a housing body and an end cap, the housing body has an opening, and the end cap is used to close the opening, wherein the first wall is the end cap.

15. An electrical device, characterized in that, Including the battery cell according to any one of claims 1-13.

16. A manufacturing method of a battery cell, characterized in that, Including the battery according to claim 14. Including: Providing a housing body and an electrode terminal, the electrode terminal is insulatedly installed on the housing body, the housing body has an opening, and the electrode terminal is provided with a liquid injection hole; Providing an end cap; Provide an electrode assembly having a central hole, with a first tab provided at one end of the electrode assembly; Provide a first current collector member having a first hole and a second hole; Connect the first current collector member to the first tab, place the electrode assembly into the housing, cover the opening with the end cap, such that the first current collector member is located between the end cap and the electrode assembly. Wherein, the end cap has a first surface facing the first current collector member, the first current collector member has a second surface facing the end cap, one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the end cap and the first current collector member. The first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap; Inject electrolyte into the interior of the housing through the liquid injection hole, the electrolyte enters the central hole, passes through the first hole into the gap, and then enters the electrode assembly through the gap.

17. A manufacturing device for a battery cell, characterized in that, Comprising: A first providing device for providing a housing and an electrode terminal, the electrode terminal being insulated and installed in the housing, the housing having an opening, and the electrode terminal being provided with a liquid injection hole; A second providing device for providing an end cap; A third providing device for providing an electrode assembly having a central hole, with a first tab provided at one end of the electrode assembly; A fourth providing device for providing a first current collector member having a first hole and a second hole; A first assembling module for connecting the first current collector member to the first tab, placing the electrode assembly into the housing, covering the opening with the end cap, such that the first current collector member is located between the end cap and the electrode assembly. Wherein, the end cap has a first surface facing the first current collector member, the first current collector member has a second surface facing the end cap, one of the first surface and the second surface is provided with a protrusion, and the other abuts against the protrusion to form a gap between the end cap and the first current collector member. The first hole is disposed opposite to the central hole, the second hole is disposed opposite to the first tab, and the first hole is configured to communicate with the second hole through the gap; A second assembling module for injecting electrolyte into the interior of the housing through the liquid injection hole, the electrolyte enters the central hole, passes through the first hole into the gap, and then enters the electrode assembly through the gap.

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