Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell is provided with an accommodating cavity and a wall part, the wall part is provided with a liquid injection hole along a first direction and is provided with an electrode terminal along a second direction, and the first direction is intersected with the second direction; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises an electrode main body and a tab extending from the end part of the electrode main body along the first direction, and the tab is connected with the electrode terminal. During liquid injection, liquid is injected on one side, different from the direction of the electrode terminal, of the shell, and air pressures on the two sides in the shell are different, so that the problem that gas in the shell cannot be exhausted can be effectively solved. And the tab is arranged between the liquid injection hole and the electrode main body, so that the risk that the electrode main body is damaged due to electrolyte scouring can be reduced. And the liquid injection hole and the electrode terminal are positioned in two directions, so that the structural layout of the shell can be optimized.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell, a battery, and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric airplanes, and electric tools.

[0003] A battery cell usually has a liquid injection hole provided on each of its two sides, and electrolyte is injected through the two liquid injection holes during the liquid injection process of the battery cell. However, injecting electrolyte through the two liquid injection holes easily causes the same pressure to be formed on the two sides of the battery cell where the two liquid injection holes are located, and the gas in the part of the battery cell between the two liquid injection holes is blocked by the injected electrolyte and is difficult to discharge. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, and this battery cell is conducive to discharging the gas in the battery cell during the liquid injection process.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a housing and an electrode assembly; the housing has a receiving cavity and a wall portion, the wall portion is provided with a liquid injection hole along a first direction and an electrode terminal along a second direction, and the first direction intersects with the second direction; the electrode assembly is disposed in the receiving cavity, and the electrode assembly includes an electrode body and a tab extending from an end of the electrode body along the first direction, and the tab is connected to the electrode terminal.

[0006] In the above structure, a liquid injection hole and a tab are provided along the first direction, an electrode terminal is provided along the second direction, the direction where the liquid injection hole is located is different from the direction where the electrode terminal is located, the direction where the tab is located is different from the direction where the electrode terminal is located, and the direction where the liquid injection hole is located is the same as the direction where the tab is located. When injecting liquid into the battery cell, it is placed vertically along the first direction, and liquid is injected into the housing through the liquid injection hole.

[0007] By providing the liquid injection hole in a direction different from the direction where the electrode terminal is located on the housing, injecting liquid from one side of the housing, and there being a pressure difference between the two sides inside the housing, the gas inside the housing can be smoothly discharged through the liquid injection hole, and it is not easily blocked by the injected electrolyte, effectively solving the problem that the gas inside the housing cannot be discharged. The direction where the liquid injection hole is located is the same as the direction where the tab is located, and the tab is between the liquid injection hole and the electrode body. The electrolyte entering the housing through the liquid injection hole will not directly wash the electrode body, and the risk of damage to the electrode body can also be reduced. The liquid injection hole and the electrode terminal are respectively located in two intersecting directions on the housing, and the structural layout on the housing can also be optimized.

[0008] According to the battery cell provided by some embodiments of the present application, the wall portion includes a housing and an end cap, and the end cap includes a top cover sheet, an electrode terminal, and a current collector; the top cover sheet is sealingly fitted with the housing in the second direction, and the electrode terminal is mounted on the top cover sheet; the current collector is at least partially located on one side of the electrode body in the first direction and is respectively connected to the electrode terminal and the tab, and can serve as a connection medium between the electrode terminal and the tab.

[0009] According to the battery cell provided by some embodiments of the present application, the current collector is sheet-shaped, and the plane of the current collector is perpendicular to the first direction, which can reduce the volume occupied by the current collector between the outer shell and the electrode body and improve the energy density of the battery cell.

[0010] According to the battery cell provided by some embodiments of the present application, along the first direction, between the end face of the electrode body facing the liquid injection hole and the liquid injection hole, the projections of the liquid injection hole and the current collector do not overlap. When the battery cell is injected with liquid, the current collector will not hinder the injection of the electrolyte and will not hinder the production discharge channel of the battery cell.

[0011] According to the battery cell provided by some embodiments of the present application, the electrode body is a wound structure, and the winding axis is parallel to the first direction. When the battery cell is injected with liquid, the electrolyte is injected along the first direction, and the direction of electrolyte injection is the same as the direction of the gap between the positive electrode sheet and the separator, and between the separator and the negative electrode sheet of the electrode body, which can directly infiltrate the electrode body and improve the liquid injection efficiency.

[0012] According to the battery cell provided by some embodiments of the present application, the electrode body is a laminated structure, and the lamination plane is parallel to the plane established by the first direction and the second direction. When the battery cell is injected with liquid, the injected electrolyte can directly infiltrate the electrode body along the gap between the positive electrode sheet and the separator, and between the separator and the negative electrode sheet of the electrode body, improving the liquid injection efficiency.

[0013] According to the battery cell provided by some embodiments of the present application, the housing includes two first shell walls oppositely arranged in the first direction, at most one second shell wall arranged in the second direction, and two third shell walls oppositely arranged in the third direction; the first direction, the second direction, and the third direction are perpendicular to each other; the liquid injection hole is located on one of the first shell walls. The housing is a cuboid housing, the battery cell is a square shell battery cell, and the liquid injection hole is a liquid injection hole on the side wall of the square shell battery cell.

[0014] According to the battery cell provided by some embodiments of the present application, the area of the third shell wall is larger than the area of the first shell wall, and the area of the third shell wall is larger than the area of the second shell wall. When the battery cell is injected with liquid, the cross-sectional area perpendicular to the first direction is smaller, which can reduce the risk of gas in the outer shell being blocked by the electrolyte.

[0015] According to the battery cell provided by some embodiments of the present application, the area of the second shell wall is larger than that of the first shell wall. The outer shell is a cuboid, with the first direction being the length direction, the second direction being the height direction, and the third direction being the width direction. The length value is greater than the height value, and the height value is greater than the width value. The liquid injection hole is at one end in the length direction. When injecting liquid into the battery cell, the cross-sectional area perpendicular to the first direction can be further reduced.

[0016] According to the battery cell provided by some embodiments of the present application, the housing is provided with an opening in the second direction; there is one top cover plate, which is hermetically installed at the opening of the housing. Two electrode terminals and two current collectors are installed on the top cover plate, and the two electrode terminals correspond to the two current collectors one by one; the two current collectors are respectively located at two ends of the top cover plate along the first direction, and are respectively connected to the tab ears at two ends of the electrode body along the first direction. There is one end cover, which can reduce the assembly workload of the battery cell. Both electrode terminals of the battery cell are located on the same side of the outer shell in the second direction, which is convenient for the series and / or parallel arrangement of the battery cells during subsequent assembly.

[0017] According to the battery cell provided by some embodiments of the present application, along the second direction, the distance between the free end of the current collector and the end face of the top cover plate facing away from the current collector is a, and the range of a is 30 mm to 300 mm; along the second direction, the distance between the end of the liquid injection hole facing the top cover plate and the end face of the top cover plate facing away from the current collector is b, and the difference range between b and a is 10 mm to 100 mm. Numerically, b is greater than a, which can avoid the obstruction of the current collector to the injection and drainage channels of the electrolyte. Moreover, setting the above distances within the above ranges can also optimize the structural layout of the battery cell.

[0018] According to the battery cell provided by some embodiments of the present application, the liquid injection hole is a round hole with a diameter of c, and the range of c is 5 mm to 30 mm. The round-hole-shaped liquid injection hole is convenient for processing and manufacturing on the outer shell. Moreover, in order to match the specifications of different battery cells, the diameter of the liquid injection hole can be designed in different sizes.

[0019] According to the battery cell provided by some embodiments of the present application, along the second direction, the distance between the end of the liquid injection hole facing away from the top cover plate and the end face of the housing opposite to the top cover plate is d, and the range of d is 10 mm to 100 mm. Setting the position of the liquid injection hole within the above range can ensure a certain distance between the liquid injection hole and the corresponding end face of the housing, and reduce the influence of opening the liquid injection hole on the housing structure.

[0020] According to the battery cell provided by some embodiments of the present application, the housing is provided with two openings in the second direction; there are two top cover sheets, which are respectively and sealingly installed at the two openings of the housing, and an electrode terminal and a current collector are installed on each top cover sheet. The end covers are designed to be two, and each end cover has an electrode terminal, and the two electrode terminals can be distributed at different ends of the housing along the second direction, enriching the structural form of the battery cell.

[0021] According to the battery cell provided by some embodiments of the present application, along the first direction, the two current collectors are respectively located at both ends of the electrode body. The tabs of the electrode assembly can extend out from both ends of the electrode body along the first direction. When the two electrode terminals are respectively located at the two ends of the housing in the second direction, each current collector correspondingly connects to the tab at one end of the electrode assembly, which not only facilitates the connection between the current collector and the tab, but also facilitates the processing of the electrode assembly, and arranges the positive tab and the negative tab of the electrode assembly at different ends of the electrode body.

[0022] According to the battery cell provided by some embodiments of the present application, along the first direction, the two current collectors are both located at the same end of the electrode body; along the first direction, the current collector is located between the liquid injection hole and the electrode body, which can not only reduce the volume occupation of the electrode assembly and the current collector along the first direction, but also leave the space occupied by the current collector and the tab between the electrode body and the liquid injection hole, and the injected electrolyte will not directly impact the electrode body.

[0023] In a second aspect, some embodiments of the present application provide a battery, which includes the battery cell provided by any of the above technical solutions.

[0024] In a third aspect, some embodiments of the present application provide an electrical device, which includes the battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0025] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0026] Some embodiments of the present application provide a battery cell, a battery and an electrical device. The battery cell includes a housing and an electrode assembly. The wall of the housing is provided with a liquid injection hole along the first direction and an electrode terminal along the second direction. The tab of the electrode assembly extends out from the end of the electrode body along the first direction. The liquid injection hole is in a different direction from the electrode terminal, the tab is in a different direction from the electrode terminal, and the liquid injection hole is in the same direction as the tab. When injecting liquid into the battery cell, by injecting liquid on one side of the housing different from the direction where the electrode terminal is located, there is a pressure difference between the two sides inside the housing, so that the gas inside the housing can be smoothly discharged through the liquid injection hole and is not blocked by the injected electrolyte, effectively solving the problem that the gas inside the housing cannot be discharged. In addition, the tab is between the liquid injection hole and the electrode body, and the electrolyte entering the housing from the liquid injection hole will not directly wash the electrode body, and the risk of damage to the electrode body can also be reduced.

[0027] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0029] Figure 1 Schematic structural diagram of a vehicle provided in some embodiments of this application;

[0030] Figure 2 Schematic exploded view of a battery provided in some embodiments of this application;

[0031] Figure 3 Schematic structural diagram of a battery module provided in some embodiments of this application;

[0032] Figure 4 Schematic structural diagram of a battery cell provided in some embodiments of this application;

[0033] Figure 5 Schematic exploded view of a battery cell provided in some embodiments of this application;

[0034] Figure 6 Schematic internal structure diagram of a battery cell provided in some embodiments of this application;

[0035] Figure 7 Schematic structural diagram of another battery cell provided in some embodiments of this application;

[0036] Figure 8 Schematic internal structure diagram of another battery cell provided in some embodiments of this application;

[0037] Figure 9 Schematic structural diagram of yet another battery cell provided in some embodiments of this application;

[0038] Figure 10 Schematic internal structure diagram of yet another battery cell provided in some embodiments of this application.

[0039] In the drawings:

[0040] 1 - Vehicle; 2 - Battery; 3 - Controller; 4 - Motor; 5 - Box; 5a - First box part; 5b - Second box part; 5c - Accommodating part; 6 - Battery module; 7 - Battery cell;

[0041] 10 - Wall part; 11 - Housing; 111 - Third housing wall; 112 - First housing wall; 1121 - Liquid injection hole; 12 - End cover; 121 - Top cover piece; 122 - Current collector; 123 - Electrode terminal; 124 - Explosion-proof valve; 20 - Electrode assembly; 21 - Electrode body; 22 - Tab;

[0042] X - Third direction; Y - Second direction; Z - First direction. Detailed implementation manners

[0043] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0044] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present application.

[0046] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise clearly and specifically defined.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0049] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely applied to electric transportation means such as electric bicycles, electric motorcycles, electric vehicles, as well as multiple fields such as military equipment and aerospace.

[0050] The battery mentioned in the embodiments of the present application includes one or more battery modules, and a battery module refers to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0051] The battery cell can be a secondary battery cell, and a secondary battery cell refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0052] The battery cell can be an ion battery cell, and the ion battery cell includes but is not limited to a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a magnesium ion battery cell, a calcium ion battery cell.

[0053] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can play a role in preventing the short circuit between the positive and negative electrodes, and at the same time, the ion channels arranged thereon can allow the active ions to pass through.

[0054] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid-state.

[0055] In some embodiments, the electrode assembly is provided with tabs, which can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0056] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0057] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0058] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0059] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0060] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0061] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0062] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0063] When injecting liquid into the battery cell, injection holes are usually opened at both ends, and the electrolyte is injected simultaneously. As the electrolyte is injected, the same pressure is likely to be formed on both sides where the two injection holes are located. In this case, the gas inside the battery cell is easily blocked by the electrolyte and difficult to discharge.

[0064] To facilitate the discharge of gas from the battery cell during the electrolyte injection process, some embodiments of the present application provide a battery cell, which includes a housing and an electrode assembly; the housing has a receiving cavity and a wall portion, the wall portion is provided with an injection hole along a first direction and an electrode terminal along a second direction, and the first direction intersects with the second direction; the electrode assembly is disposed in the receiving cavity, and the electrode assembly includes an electrode main body and a tab extending from an end of the electrode main body along the first direction, and the tab is connected to the electrode terminal. In the above structure, the direction of the injection hole is different from that of the electrode terminal, the direction of the tab is different from that of the electrode terminal, and the direction of the injection hole is the same as that of the tab. When injecting electrolyte from one side of the housing, there is a pressure difference between the two sides of the injection direction in the housing, which can enable the gas in the housing to be smoothly discharged through the injection hole without being blocked by the injected electrolyte, effectively solving the problem that the gas in the housing cannot be discharged. In addition, since the direction of the injection hole is the same as that of the tab and the tab is located between the injection hole and the electrode main body, the electrolyte entering the housing through the injection hole will not directly flush the electrode main body, and the risk of damage to the electrode main body can also be reduced.

[0065] The battery cell described in the embodiments of the present application is applicable to batteries and electrical devices using the batteries. The battery cell can be but is not limited to being used in batteries, and can also be used in products such as vehicles, airplanes, ships, electronic devices, and power tools, etc., which can improve the reliability of these products.

[0066] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and a power tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the power tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a power planer, etc.

[0067] For the convenience of description in the following embodiments, a vehicle 1, which is an electrical device according to an embodiment of the present application, is taken as an example for illustration.

[0068] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1 provided by some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 2 is disposed inside vehicle 1. The battery 2 can be disposed at the bottom, head, or tail of vehicle 1. The battery 2 can be used for power supply of vehicle 1. For example, the battery 2 can be used as the operating power source of vehicle 1. Vehicle 1 can also include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start-up, navigation, and driving of vehicle 1.

[0069] In some embodiments of the present application, the battery 2 can not only be used as the operating power source of vehicle 1, but also as the driving power source of vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1.

[0070] Please refer to Figure 2 and Figure 3 , Figure 2 Schematic exploded view of battery 2 provided by some embodiments of the present application, Figure 3 Schematic structural diagram of a battery module provided by some embodiments of the present application. The battery 2 includes a box body 5 and battery cells (not shown in the figure). The battery cells are accommodated in the box body 5. Among them, the box body 5 is used to provide an accommodation space for the battery cells 7. There can be multiple battery cells 7 in the battery 2. The multiple battery cells 7 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 7. The multiple battery cells 7 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 7 is accommodated in the box body 5. Of course, the battery 2 can also be in the form that multiple battery cells 7 are first connected in series, parallel, or in a mixed connection to form battery modules 6, and then the multiple battery modules 6 are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 5.

[0071] The box body 5 can include a first box body part 5a and a second box body part 5b. The first box body part 5a and the second box body part 5b cover each other to form an accommodation part 5c, so as to define a placement space for accommodating the battery cells 7. The first box body part 5a and the second box body part 5b can be in various shapes, such as a cuboid, a cylinder, etc. The first box body part 5a can be a hollow structure with one side open, and the second box body part 5b can also be a hollow structure with one side open. The open side of the second box body part 5b covers the open side of the first box body part 5a, then a box body 5 with an accommodation part 5c is formed.

[0072] The battery 2 can also include other structures. For example, the battery 2 can also include a busbar component for realizing the electrical connection between the multiple battery cells 7.

[0073] Please refer to Figure 4 and Figure 5 ,Figure 4 The structural schematic diagram of a battery cell provided by some embodiments of the present application Figure 5 The disassembled schematic diagram of a battery cell provided by some embodiments of the present application. In some embodiments of the present application, the battery cell includes a housing and an electrode assembly 20; the housing has a receiving cavity and a wall portion 10, the wall portion 10 is provided with a liquid injection hole 1121 along the first direction Z, and an electrode terminal 123 along the second direction Y, the first direction Z intersects with the second direction Y; the electrode assembly 20 is disposed in the receiving cavity, the electrode assembly 20 includes an electrode main body 21 and a tab 22 extending from an end portion of the electrode main body 21 along the first direction, and the tab 22 is connected to the electrode terminal 123.

[0074] The housing can be a wall structure disposed on the outer periphery of the battery cell 7, which can form a receiving cavity for receiving other components of the battery cell 7 such as the electrode assembly 20 and the electrolyte, and can protect other components of the battery cell 7 such as the electrode assembly 20.

[0075] The electrode assembly 20 is disposed in the receiving cavity and can be in contact with the electrolyte in the receiving cavity. The electrode main body 21 can be the main structure in the electrode assembly 20, and the tab 22 can extend from an end portion of the electrode main body 21 along the first direction Z so as to be connected to other components in the battery cell 7.

[0076] The electrode terminal 123, as a component disposed on the housing, can be used for electrically connecting to an electrical device or a charging device outside the battery cell 7 so that the battery cell 7 can be charged and discharged. The electrode terminal 123 can include, but is not limited to, a columnar structure, and those skilled in the art can set it according to the actual situation.

[0077] The liquid injection hole 1121 can be on one side of the wall portion 10 along the first direction Z and penetrate through the wall portion 10 on this side. On this side, the number of the liquid injection holes 1121 can be one or more, and the shape of the liquid injection hole 1121 can be circular, rectangular, square or other shapes.

[0078] In the above structure, the liquid injection hole 1121 is provided on the wall portion 10 along the first direction Z. When injecting liquid along the first direction Z, there is a pressure difference on both sides of the interior of the housing in the first direction Z, which enables the gas inside the housing to be smoothly discharged through the liquid injection hole 1121. The gas is not easily blocked by the injected electrolyte, effectively solving the problem that the gas inside the housing cannot be discharged. Both the liquid injection hole 1121 and the tab 22 are arranged along the first direction Z, and the tab 22 is located between the liquid injection hole 1121 and the electrode body 21. The electrolyte entering the housing through the liquid injection hole 1121 does not directly flush the electrode body 21, which can reduce the risk of damage to the electrode body 21. The liquid injection hole 1121 and the electrode terminal 123 are respectively located in two intersecting directions on the housing and are not on the same side of the housing, which can reduce the number of components and / or structures at the location of the electrode terminal 123 on the housing and optimize the structural layout.

[0079] Please refer to Figure 5 , in some embodiments, the wall portion 10 includes a housing 11 and an end cap 12. The end cap 12 includes a top cover sheet 121, an electrode terminal 123, and a current collector 122; the top cover sheet 121 is sealingly fitted with the housing 11 in the second direction Y, and the electrode terminal 123 is mounted on the top cover sheet 121; at least a part of the current collector 122 is located on one side of the electrode body 21 along the first direction Z and is respectively connected to the electrode terminal 123 and the tab 22.

[0080] The housing 11 is provided with an opening through which the electrode assembly 20 can be inserted. After inserting the electrode assembly 20, the end cap 12 is sealingly mounted on the opening of the housing 11. The current collector 122 is mounted on the top cover sheet 121 and is electrically connected to the electrode terminal 123, and can serve as a connection medium between the electrode terminal 123 and the tab 22.

[0081] In the above structure, the electrode terminal 123 is mounted on the top cover sheet 121, while the liquid injection hole 1121 is located on the housing 11. By providing the liquid injection hole 1121 on the housing 11, the processing difficulty of the end cap 12 can be reduced, the structural strength of the end cap 12 can be improved, and the structural layout of the end cap 12 can be optimized. For example, it is convenient to flexibly design the position and shape of the explosion-proof valve 124 on the end cap 12.

[0082] Please refer to Figure 5 , in some embodiments, the current collector 122 is in the shape of a sheet, and the plane of the current collector 122 is perpendicular to the first direction Z.

[0083] The current collector Z can be formed by stamping a metal sheet. One end of the current collector 122 is fixed on the top cover sheet 121 and is electrically connected to the electrode terminal 123, then extends along the first direction Z towards the end of the electrode body 21, extends to the location of the tab 22, and bends towards the tab 22 until the other end is electrically connected to the tab 22.

[0084] In the above structure, the current collector 122 is at least partially located on one side of the electrode body 21 along the first direction Z. In the first direction Z, there is at least one area between the electrode body 21 and the housing where the current collector 122 is located. When the current collector 122 is in a sheet shape, the volume occupied by the current collector 122 between the housing and the electrode body 21 can be reduced, and the volume ratio of the electrode body 21 in the housing can be increased, which can improve the energy density of the battery cell 7.

[0085] Please refer to Figure 6 , Figure 6 FIG. is a schematic diagram of the internal structure of a battery cell provided in some embodiments of the present application. In some embodiments, along the first direction Z, between the end face of the electrode body 21 facing the liquid injection hole 1121 and the liquid injection hole 1121, the projections of the liquid injection hole 1121 and the current collector 122 do not overlap.

[0086] In the first direction Z, when the current collector 122 is located between the liquid injection hole 1121 and the electrode body 21, the projections of the liquid injection hole 1121 and the current collector 122 do not intersect at all, that is, along the first direction Z, there is a gap between the liquid injection hole 1121 and the current collector 122.

[0087] In the above structure, the projections of the current collector 122 and the liquid injection hole 1121 do not overlap. When the battery cell 7 is filled with liquid, the electrolyte injected into the housing along the liquid injection hole 1121 does not directly face the current collector 122. The current collector 122 does not hinder the injection of the electrolyte and does not hinder the production discharge channel of the battery cell 7, which can make the injection of the electrolyte smoother.

[0088] Please refer to Figure 5 , in some embodiments, the electrode body 21 is a wound structure, and the winding axis is parallel to the first direction Z.

[0089] The electrode assembly 20 is a wound electrode assembly. The electrode body 21 is wound and is in an oblong column shape, and the axis is parallel to the first direction Z. The tab 22 is located at one end or both ends of the electrode body 21 along the first direction Z.

[0090] In the above structure, when the battery cell 7 is filled with liquid, the electrolyte is injected along the first direction Z, and the injection direction of the electrolyte is the same as the direction of the gap between the positive electrode plate and the separator, and between the separator and the negative electrode plate of the electrode body 21, which can directly infiltrate the electrode body 21 and improve the liquid injection efficiency.

[0091] In some embodiments, the electrode body 21 is a laminated structure, and the lamination plane is parallel to the plane established by the first direction Z and the second direction Y.

[0092] The electrode assembly 20 is a stacked electrode assembly. The electrode body 21 is formed by sequentially stacking a positive electrode sheet and a negative electrode sheet, with a separator disposed between the positive electrode sheet and the negative electrode sheet. The tab 22 is located at one or both ends of the electrode body 21 along the first direction Z.

[0093] In the above structure, when the battery cell 7 is filled with electrolyte, the injected electrolyte can directly infiltrate the electrode body 21 along the gaps between the positive electrode sheet and the separator, and between the separator and the negative electrode sheet of the electrode body 21, improving the filling efficiency. Moreover, when the electrode body 21 is a stacked structure, compared with a wound structure, the volume occupied by the electrode body 21 is larger, so the energy density can be further increased.

[0094] Please refer to Figure 5 , in some embodiments, the housing 11 includes two first shell walls 112 disposed opposite to each other along the first direction Z, at most one second shell wall disposed along the second direction Y, and two third shell walls 111 disposed opposite to each other along the third direction X; the first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs; the filling hole 1121 is located on one of the first shell walls 112.

[0095] The two first shell walls 112 and the two third shell walls 111 of the housing 11 form a rectangular parallelepiped tubular structure with both ends open, and when one of the open ends is the second shell wall, the other end is the end cap 12, or both open ends can be the end cap 12. The housing 11 of the wall portion 10 is formed integrally and then hermetically connected to the end cap 12 of the wall portion 10 to form the outer shell of the square shell battery.

[0096] In the above structure, the battery cell 7 is a square shell battery cell, and the filling hole 1121 is provided on the side wall of the housing 11 of the square shell battery cell, which can be processed on the plate before the housing 11 is formed, facilitating processing and manufacturing. Moreover, compared with setting the filling hole 1121 on the top cover sheet 121, when the filling hole 1121 is provided on the housing 11, the requirement for the position accuracy of the filling hole 1121 can be reduced, thereby reducing the defective rate.

[0097] Please refer to Figure 5 , in some embodiments, the area of the third shell wall 111 is larger than the area of the first shell wall 112, and the area of the third shell wall 111 is larger than the area of the second shell wall.

[0098] In the above structure, when the battery cell 7 is filled with electrolyte along the first direction Z, the cross-section faced by the electrolyte, that is, the cross-section perpendicular to the first direction Z, has a smaller area, and the electrode body 7 is more easily infiltrated by the electrolyte. Bubbles are not likely to remain inside the electrode body 21 and between the electrode body 21 and the outer shell, reducing the risk of gas inside the outer shell being blocked by the electrolyte.

[0099] Please refer to Figure 5In some embodiments, the area of the second shell wall is greater than the area of the first shell wall 112 .

[0100] The housing is a cuboid, with a length along the first direction Z, a height along the second direction Y, and a width along the third direction X. The length value is greater than the height value, and the height value is greater than the width value.

[0101] In the above structure, the injection hole 1121 is located at one end of the outer shell along its length. This prevents the battery cell 7 from experiencing equal pressure at both ends of its length when liquid is injected. Instead, the pressure is lower at the end where the injection hole 1121 is located and higher at the other end, making it easier for gas within the outer shell to escape. Furthermore, the cross-section facing the injection hole 1121 during injection is the smallest cross-section within the prismatic battery cell, further reducing the risk of gas within the outer shell being blocked by the electrolyte.

[0102] Please refer to Figure 5 In some embodiments, the shell 11 is provided with an opening in the second direction Y; there is one top cover sheet 121, which is sealed and installed at the opening of the shell 11, and two electrode terminals 123 and two current collectors 122 are installed on the top cover sheet 121, and the two electrode terminals 123 correspond to the two current collectors 122 one by one; the two current collectors 122 are respectively located at the two ends of the top cover sheet 121 along the first direction Z, and are respectively connected to the electrode ears 22 at the two ends of the electrode body 21 along the first direction Z.

[0103] In the above structure, there is a single end cap 12. The housing 11 includes two first walls 112, two third walls 111, and a second wall. The end cap 12 is sealed and mounted on the end opposite the second housing. Providing a single end cap 12 reduces the assembly workload for the battery cell 7. Both electrode terminals 123 of the battery cell 7 are located on the same side of the housing in the second direction Y, facilitating the serial and / or parallel arrangement of the battery cells 7 during subsequent assembly.

[0104] Please refer to Figure 6 In some embodiments, along the second direction Y, the distance between the free end of the current collecting member 122 and the end surface of the top cover sheet 121 facing away from the current collecting member 122 is a, and the range of a is 30 mm to 300 mm; along the second direction Y, the distance between the end of the injection hole 1121 toward the top cover sheet 121 and the end surface of the top cover sheet 121 facing away from the current collecting member 122 is b, and the difference between b and a ranges from 10 mm to 100 mm.

[0105] Exemplarily, the value of a can be 30mm, 60mm, 90mm, 120mm, 150mm, 180mm, 210mm, 240mm, 270mm, 300mm, or any intermediate value between any two adjacent end values above; the value of b is greater than a, and the difference between the two can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or any intermediate value between any two adjacent end values above.

[0106] In the above structure, the value of b is greater than the value of a, which can avoid the obstruction of the current collector 122 to the electrolyte injection and production discharge channels. Moreover, setting the above distance within the above range can also optimize the structural layout of the battery cell 7.

[0107] Please refer to Figure 6 , in some embodiments, the liquid injection hole 1121 is a circular hole with a diameter of c, and the range of c is 5mm to 30mm.

[0108] Exemplarily, the value of c can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, or any intermediate value between any two adjacent end values above.

[0109] In the above structure, the liquid injection hole 1121 is a circular hole. The circular hole type of the liquid injection hole is convenient for machining and manufacturing on the housing, and there will be no stress concentration area around the liquid injection hole 1121. Moreover, the value range of the diameter of the liquid injection hole 1121 can match the specifications of different battery cells 7 to meet the liquid injection and production discharge requirements of the battery cell 7.

[0110] Please refer to Figure 6 , in some embodiments, along the second direction Y, the distance between the end of the liquid injection hole 1121 facing away from the top cover sheet 121 and the end face of the housing 11 opposite to the top cover sheet 121 is d, and the range of d is 10mm to 100mm.

[0111] Exemplarily, the value of d can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or any intermediate value between any two adjacent end values above.

[0112] In the above structure, setting the position of the liquid injection hole 1121 within the above range can make there be a certain distance between the liquid injection hole 1121 and the corresponding end face of the housing 11, and there is a certain distance between the liquid injection hole 1121 and the edge line between the second shell wall and the first shell wall 112, which can reduce the influence on the structural strength at this edge line, and further reduce the influence of opening the liquid injection hole 1121 on the structure of the housing 11.

[0113] Please refer toFigures 7 to 10 , Figure 7 Another structural schematic diagram of a battery cell provided by some embodiments of the present application, Figure 8 Another internal structural schematic diagram of a battery cell provided by some embodiments of the present application, Figure 9 Still another structural schematic diagram of a battery cell provided by some embodiments of the present application, Figure 10 Still another internal structural schematic diagram of a battery cell provided by some embodiments of the present application.

[0114] In some embodiments, the housing 11 is provided with two openings in the second direction Y; there are two top cover sheets 121, which are respectively and sealingly installed at the two openings of the housing 11, and an electrode terminal 123 and a current collector 122 are installed on each top cover sheet 121.

[0115] The outer shell has two end covers 12, and the two end covers 12 are oppositely arranged along the second direction Y of the outer shell. Each end cover 12 includes a top cover sheet 121, an electrode terminal 123 and a current collector 122. The two current collectors 122 can be located at the same end or different ends of the electrode body 21 along the first direction Z.

[0116] In the above structure, the end cover 12 is designed to be two, and the two electrode terminals 123 can be distributed at different ends of the outer shell along the second direction Y, so that one end of the outer shell along the second direction Y is the positive electrode and the other end is the negative electrode, enriching the structural form of the battery cell 7.

[0117] Please refer to Figure 7 and Figure 8 , in some embodiments, along the first direction Z, the two current collectors 122 are respectively located at both ends of the electrode body 21.

[0118] The tabs 22 of the electrode assembly 20 are located at both ends of the electrode body 21 along the first direction Z, and one end tab 22 is the positive tab and the other end tab 22 is the negative tab. One current collector 122 is electrically connected to the positive tab, and the electrode terminal 123 electrically connected to this current collector 122 is the positive electrode of the battery cell 7; the other current collector 122 is electrically connected to the negative tab, and the electrode terminal 123 electrically connected to this current collector 122 is the negative electrode of the battery cell 7.

[0119] In the above structure, the tabs 22 of the electrode assembly 20 can extend out at both ends of the electrode body 21 along the first direction Z, one end tab 22 is the positive tab and the other end tab 22 is the negative tab, which is not only convenient for the connection between the current collector 122 and the tab 22, but also convenient for the processing of the electrode assembly 20. The arrangement form of the tabs 22 is simple, and the contact area between the tabs 22 and the current collector 122 can be increased.

[0120] Please refer to Figure 9 andFigure 10 , in some embodiments, along the first direction Z, both current collectors 122 are located at the same end of the electrode body 21; along the first direction Z, the current collector 122 is located between the liquid injection hole 1121 and the electrode body 21.

[0121] The tabs 22 of the electrode assembly 20 are located at the same end of the electrode body 21 along the first direction Z. For example, the tab 22 close to one current collector 122 can be the positive tab, and the tab 22 close to the other current collector 122 can be the negative tab. In the second direction Y, there is a gap between the two current collectors 122, and the liquid injection hole 1121 is located in the area where the gap is located.

[0122] In the above structure, both current collectors 122 are located at the same end of the electrode body 21, which can not only reduce the volume occupied by the electrode assembly 20 and the current collectors 122 along the first direction Z, improve the energy density of the battery cell 7, but also leave space occupied by the current collectors 122 and the tabs 22 between the electrode body 21 and the liquid injection hole 1121, and the injected electrolyte will not directly impact the electrode body 21.

[0123] Some embodiments of the present application further provide a battery 2, which includes the battery cell 7 provided by the above technical solution.

[0124] Some embodiments of the present application further provide an electrical device, which includes the battery 2 provided by the above technical solution, and the battery 2 is used to provide electrical energy.

[0125] Some embodiments of the present application provide a battery cell 7, which includes a housing and an electrode assembly 20; the wall portion 10 of the housing is provided with a liquid injection hole 1121 along the first direction Z and an electrode terminal 123 along the second direction Y; the tabs 22 of the electrode assembly 20 are located at the end of the electrode body 21 along the first direction Z. When injecting liquid along the first direction Z, there is a pressure difference on both sides of the inside of the housing in the first direction Z, which can make the gas in the housing smoothly discharge from the liquid injection hole 1121 and is not easily blocked by the injected electrolyte, effectively solving the problem that the gas in the housing cannot be discharged. The tabs 22 are located between the liquid injection hole 1121 and the electrode body 21, and the electrolyte will not directly flush the electrode body 21 during liquid injection, which can reduce the risk of damage to the electrode body 21. The liquid injection hole 1121 and the electrode terminal 123 are not located on the same side of the housing, which can reduce the number of components and / or structures at the location of the electrode terminal 123 on the housing and optimize the structural layout.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: a housing having a receiving cavity and a wall portion, wherein the wall portion is provided with a liquid injection hole along a first direction and an electrode terminal along a second direction, wherein the first direction intersects the second direction; An electrode assembly is disposed in the accommodating cavity, wherein the electrode assembly includes an electrode body and a tab extending from an end portion of the electrode body along the first direction, wherein the tab is connected to the electrode terminal.

2. The battery cell according to claim 1, wherein The wall portion includes a shell and an end cover, and the end cover includes a top cover sheet, the electrode terminal and a current collector; The top cover sheet is sealed with the housing in the second direction, and the electrode terminal is mounted on the top cover sheet; The current collecting member is at least partially located on one side of the electrode body along the first direction, and is respectively connected to the electrode terminal and the electrode tab.

3. The battery cell according to claim 2, characterized in that, The current collecting member is in a sheet shape, and a plane of the current collecting member is arranged perpendicular to the first direction.

4. The battery cell according to claim 2, wherein Along the first direction, between the end surface of the electrode body facing the liquid injection hole and the liquid injection hole, projections of the liquid injection hole and the current collecting member do not overlap.

5. The battery cell according to claim 1, characterized in that, The electrode body is a winding structure, and the winding axis is parallel to the first direction.

6. The battery cell according to claim 1, characterized in that, The electrode body is a laminate structure, and the laminate plane is parallel to the plane established by the first direction and the second direction.

7. The battery cell according to claim 2, wherein, The housing comprises two first housing walls arranged opposite to each other along the first direction, at most one second housing wall arranged opposite to each other along the second direction, and two third housing walls arranged opposite to each other along the third direction; The first direction, the second direction, and the third direction are perpendicular to each other; and the injection hole is located on one of the first shell walls.

8. The battery cell according to claim 7, characterized in that, The area of the third shell wall is greater than that of the first shell wall, and the area of the third shell wall is greater than that of the second shell wall.

9. The battery cell according to claim 8, characterized in that, The area of the second shell wall is greater than the area of the first shell wall.

10. The battery cell according to claim 2, wherein The housing is provided with an opening in the second direction; There is one top cover sheet, which is sealed and installed at the opening of the shell. Two electrode terminals and two current collectors are installed on the top cover sheet, and the two electrode terminals correspond to the two current collectors in a one-to-one manner. The two current collecting members are respectively located at two ends of the top cover sheet along the first direction, and are respectively connected to the electrode tabs at two ends of the electrode body along the first direction.

11. The battery cell according to claim 4, wherein, Along the second direction, the distance between the free end of the current collecting member and the end surface of the top cover sheet facing away from the current collecting member is a, and a range of a is 30 mm to 300 mm; Along the second direction, a distance between an end of the liquid injection hole facing the top cover sheet and an end surface of the top cover sheet facing away from the current collecting member is b, and a difference between b and a ranges from 10 mm to 100 mm.

12. The battery cell according to claim 1, wherein, The injection hole is a circular hole with a diameter c, and the range of c is 5mm to 30mm.

13. The battery cell according to claim 10, characterized in that, Along the second direction, a distance d is provided between an end portion of the liquid injection hole facing away from the top cover sheet and an end surface of the shell directly facing the top cover sheet, and d ranges from 10 mm to 100 mm.

14. The battery cell according to claim 2, wherein, The housing is provided with two openings in the second direction; There are two top cover sheets, which are respectively sealed and installed at the two openings of the shell. One electrode terminal and one current collector are installed on each top cover sheet.

15. The battery cell according to claim 14, characterized in that, Along the first direction, the two current collectors are respectively located at both ends of the electrode body.

16. The battery cell according to claim 14, characterized in that, Along the first direction, the two current collectors are both located at the same end of the electrode body; Along the first direction, the current collector is located between the liquid injection hole and the electrode body.

17. A battery, characterized in that, Comprising a plurality of battery cells according to any one of claims 1-16.

18. An electrical device, characterized in that, Comprising the battery according to claim 17, the battery being used to provide electrical energy.

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