CN220569779U - A battery cell, battery pack and electrical device - Google Patents

Abstract

This application discloses a battery cell, a battery pack and an electrical device, belonging to the field of battery technology. The battery cell forms a liquid injection hole, and the battery cell includes an electrode assembly, a casing, an end cover assembly, a current collecting assembly and a pole. . The electrode assembly has a winding structure. The electrode assembly is surrounded by a winding hole. The electrode assembly is surrounding the winding hole. The liquid injection hole is at least partially aligned with the winding hole so that the liquid injection hole and the winding hole are connected. The housing has a receiving cavity and an installation port connected to the receiving cavity, and the electrode assembly is located in the receiving cavity. The end cover assembly is located at the installation port, and the liquid injection hole penetrates the end cover assembly. The current collecting assembly is located between the electrode assembly and the end cap assembly, and the liquid injection hole penetrates the current collecting assembly. The pole is installed on the end cover assembly, the pole is electrically connected to the current collector assembly, and the pole and the liquid injection hole are staggered. The connected liquid injection holes and winding holes can improve the liquid injection efficiency of the battery cells. The liquid injection holes and the poles are staggered, which is beneficial to increasing the contact area between the poles and the bus bar, and improving the current flow capacity of the poles.

Description

A battery cell, battery pack and electrical device

Technical field

This application relates to the field of battery technology, and in particular to battery cells, battery packs and electrical devices.

Background technique

New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage.

In the related art, it is difficult to take into account the overcurrent capability of the pole of the battery cell and the liquid injection efficiency of the battery cell.

Utility model content

In order to solve the above technical problems, the present application provides a battery cell, a battery pack and an electrical device to improve the overcurrent capacity of the pole of the battery cell and the liquid injection efficiency of the battery cell.

This application is implemented through the following technical solutions.

A first aspect of the embodiment of the present application provides a battery cell with a liquid injection hole formed therein. The battery cell includes:

Electrode assembly, the electrode assembly is a coiled structure, the electrode assembly is surrounded by a coiling hole, the electrode assembly is surrounded by the coiling hole, and the liquid injection hole is at least partially connected with the coiling hole. The holes are aligned to communicate the liquid injection hole with the winding hole;

A housing having an accommodation cavity and an installation port connected to the accommodation cavity, and the electrode assembly is located in the accommodation cavity;

An end cap assembly is provided on the installation port, and the liquid injection hole penetrates through the corresponding end cap assembly;

A current collecting assembly is located between the electrode assembly and the end cap assembly, and the liquid injection hole penetrates the corresponding current collecting assembly;

The pole is installed on the end cover assembly, the pole is electrically connected to the current collecting assembly, and is staggered corresponding to the pole and the liquid injection hole.

In the solution of the embodiment of the present application, on the one hand, since the liquid injection hole is at least partially aligned with the winding hole so that the liquid injection hole and the winding hole are connected, the liquid injection hole penetrates the end cover assembly and the current collecting assembly, and passes through the liquid injection hole The injected electrolyte flows to the winding hole surrounded by the electrode assembly in the housing, and infiltrates and diffuses toward the electrode assembly, thereby improving the injection efficiency. On the other hand, since the corresponding poles and the liquid injection holes are staggered, it is beneficial to increase the contact area between the poles and the busbar connecting multiple battery cells, and improve the overcurrent capacity of the corresponding poles. Therefore, the battery cells of the embodiments of the present application can not only improve the liquid injection efficiency of the battery cells, but also improve the overcurrent capacity of the poles of the battery cells, thereby achieving a balance between the liquid injection efficiency of the battery cells and the safety of the battery cells. The purpose of the overcurrent capability of the pole.

In one embodiment, the corresponding pole is located on one side of the liquid injection hole along the radial direction of the liquid injection hole, and the battery cell further includes a pressure relief device installed on the corresponding end cover assembly, so The pressure relief device is located on the other side of the liquid injection hole along the radial direction of the liquid injection hole.

In the embodiment of the present application, it is beneficial for the pressure relief device to be kept away from the pole, reducing the risk of damage to the insulating material of the pole, and making it easier to install the pressure relief device and the pole.

In one embodiment, the pole, the liquid injection hole and the pressure relief device are arranged in sequence along the radial direction of the liquid injection hole.

In the embodiment of the present application, the pressure relief device can be kept as far away from the pole as possible, thereby reducing the risk of damage to the insulation material of the pole as much as possible, and facilitating the installation of the pressure relief device and the pole.

In one embodiment, the current collecting assembly further includes a current collecting plate and an adapter piece located between the current collecting plate and the pole. The adapter piece is connected to the current collecting plate and the pole respectively. The column is electrically connected, the current collecting plate is electrically connected to the electrode assembly, and the liquid injection hole penetrates the corresponding adapter piece and the corresponding current collecting plate.

In the embodiment of the present application, the liquid injection hole penetrates the corresponding adapter piece and the current collecting plate, and the liquid injection hole and the winding hole that are at least partially aligned with the winding hole can be connected, which is beneficial to the electrolyte injected through the injection hole flowing into the winding. Around the hole to improve the efficiency of liquid injection.

In one embodiment, the end cap assembly includes:

A cover, which is provided on the installation port, and the liquid injection hole and the corresponding pole all penetrate the corresponding cover;

An insulating member is located between the cover and the current collecting assembly, and the liquid injection hole and the corresponding pole all penetrate the corresponding insulating member.

In the embodiment of the present application, the liquid injection hole penetrates the corresponding cover and the insulating member, and the liquid injection hole and the winding hole that are at least partially aligned with the winding hole can be connected, which is beneficial to the electrolyte injected from the injection hole flowing into the winding hole. , improve injection efficiency.

In one embodiment, the number of the installation openings is one, the pole with a positive conductive polarity and the pole with a negative conductive polarity are both installed on the same end cover assembly, and the liquid injection hole penetrates the conductive pole with a polarity of A positive current collector component and a current collector component with a negative conductive polarity.

In the embodiment of the present application, by penetrating the current collector plate with positive conductive polarity and the current collector plate with negative conductive polarity through the liquid injection hole, the current collector plate with positive conductive polarity and the current collector plate with negative conductive polarity can be reduced. The flow plate blocks the electrolyte so that the electrolyte injected into the injection hole can flow to the winding hole through the current collecting plate with positive conductive polarity and the current collecting plate with negative conductive polarity, thereby improving the liquid injection efficiency.

In one embodiment, the installation ports are provided at both ends of the housing, and the end cover assembly, current collecting assembly and pole are correspondingly provided at the installation openings at each end, and the liquid injection hole runs through The installation port at one end corresponds to the end cover assembly and the current collecting assembly.

In the embodiment of the present application, the liquid injection hole penetrates the end cover assembly and the current collecting plate corresponding to the installation port at one end, so that the electrolyte injected through the liquid injection hole can flow to the winding hole through the end cover assembly and the current collecting plate at the corresponding end. The liquid injection hole does not penetrate the collecting plate at the other end, and the collecting plate at the other end does not need corresponding openings, which can simplify the structure of the collecting plate at the other end and reduce the difficulty of processing.

In one embodiment, the battery cell is a cylindrical battery cell.

In the embodiment of the present application, the winding hole of the cylindrical battery cell has a larger space, which is conducive to smoothly receiving the electrolyte injected from the liquid injection hole, and is conducive to improving the liquid injection efficiency of the battery cell.

A second aspect of the embodiment of the present application provides a battery pack, which is characterized in that it includes:

box;

Any of the above battery cells is located in the box.

A third aspect of the embodiment of the present application provides an electrical device, which is characterized by including:

device body;

A power supply device is used to supply power to the device main body, and the power supply device includes any one of the above battery cells or any one of the above battery packs.

Utility model effect

Through the positional arrangement of the liquid injection hole and the pole in the embodiment of the present application, on the one hand, since the liquid injection hole is at least partially aligned with the winding hole so that the liquid injection hole is connected with the winding hole, the liquid injection hole penetrates the end cover assembly and In the current collecting assembly, the electrolyte injected through the liquid injection hole flows to the winding hole surrounded by the electrode assembly in the housing, and infiltrates and diffuses toward the electrode assembly, thereby improving the liquid injection efficiency. On the other hand, since the corresponding poles and the liquid injection holes are staggered, it is beneficial to increase the contact area between the poles and the busbar connecting multiple battery cells, and improve the overcurrent capacity of the corresponding poles. Therefore, the battery cells of the embodiments of the present application can not only improve the liquid injection efficiency of the battery cells, but also improve the overcurrent capacity of the poles of the battery cells, thereby achieving a balance between the liquid injection efficiency of the battery cells and the safety of the battery cells. The purpose of the overcurrent capability of the pole.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be construed as limiting the application. Furthermore, the same components are designated by the same reference numerals throughout the drawings. In the attached picture:

Figure 1 is a schematic structural diagram of a battery cell according to an embodiment of the present application. The battery cell shown in the figure has poles at both ends of the casing. The pole at one end of the casing is the positive pole, and the pole at the other end is the main pole. Negative pole, adapter piece not shown in the picture;

Figure 2 is an assembly diagram of the end cap assembly, pole and pressure relief device according to the embodiment of the present application. The liquid injection hole penetrates the end cap assembly. The two poles shown in the figure are both negative poles;

Figure 3 is an assembly diagram of the end cap assembly, pole and pressure relief device according to the embodiment of the present application. The figure shows the first connection line and the dividing line. The two poles shown in the figure are both negative poles. Liquid injection hole through end cap assembly;

Figure 4 is an exploded schematic diagram of the end cover assembly, pole, pressure relief device and adapter piece of the embodiment of the present application. The collecting plate is not shown in the figure, and the liquid injection hole penetrates the end cover assembly and the current collecting assembly;

Figure 5 is an assembly diagram of the end cover assembly, pole, pressure relief device and current collecting plate according to the embodiment of the present application. The liquid injection hole penetrates the end cover assembly and the current collecting assembly.

Explanation of reference signs

Liquid injection hole 1; electrode assembly 2; winding hole 21; housing 3; accommodation cavity 31; installation port 32; end cover assembly 4; cover body 41; insulator 42; current collecting plate 51; adapter piece 52; pole Column 6; pressure relief device 7; first connection line 81; dividing line 82.

Detailed ways

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

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity, specific order or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are "or".

In the description of the embodiments of the present application, unless otherwise explicitly stipulated and limited, technical terms such as "installation", "connection", "connection" and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. It can be disassembled and connected, or integrated; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In the description of the embodiments of the present application, unless otherwise explicitly stipulated and limited, the technical term "contact" should be understood in a broad sense. It can be direct contact, contact through an intermediate intermediary layer, or two people in contact with each other. It can be a contact with basically no interaction force between two people, or it can be a contact with interaction force between two people in contact.

At present, new energy batteries are increasingly used in daily life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace. field. As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

As part of the creative concept of this application, before describing the embodiments of this application, it is necessary to analyze the reasons why it is difficult to balance the overcurrent capacity of the poles of the battery cells and the liquid injection efficiency of the battery cells in the related technology. Through reasonable Through the analysis, the technical solutions of the embodiments of the present application are obtained.

In the related art, the electrode assembly of the battery cell is located in the accommodation cavity of the casing, the end cover assembly is located in the installation opening communicating with the accommodation cavity, and the current collecting assembly between the electrode assembly and the end cover assembly is used to connect the electrode assembly and the pole The column is electrically connected, and the current collecting assembly includes a current collecting plate electrically connected to the electrode assembly. Because it is blocked by the current collecting plate, most of the electrolyte flowing into the casing of the battery cell from the liquid injection hole needs to bypass the current collecting plate to flow to the electrode assembly. Since the end of the wound electrode assembly passes the current collecting plate, Due to excessive contact, it is difficult for the electrolyte to diffuse quickly to the electrode assembly through the space between the electrode assembly and the current collecting cover. The injection rate of the liquid injected through the injection hole is slow, causing the electrolyte to spray out from the injection hole in the opposite direction. , leading to electrolyte pollution. The wound electrode assembly is surrounded by a winding hole, and the electrode assembly is surrounded by the winding hole. The liquid injection hole and the winding hole can be at least partially aligned, and the liquid injection hole and the winding hole can be directly connected. The electrolyte injected into the injection hole flows into the winding hole formed around the electrode assembly, and quickly infiltrates and diffuses into the electrode assembly, which can increase the injection rate. However, since the pole is just at the position corresponding to the winding hole, it is necessary to realize the injection. The liquid hole and the winding hole are directly connected. The liquid injection hole not only needs to penetrate the end cover assembly and the current collecting cover, but the liquid injection hole also needs to penetrate the pole. As a result, the pole cannot contact the busbar at the liquid injection hole, and the liquid injection hole is blocked. The contact area between the penetrating poles and the busbar is reduced. When multiple battery cells are connected in series, parallel or mixed through the busbar, due to the reduction in the contact area between the busbar and the poles, the resistance increases, and the same current is generated. The increase in heat may cause overheating at the contact point between the busbar and the pole. Therefore, the contact area between the busbar and the pole is reduced, which reduces the current allowed to pass through the pole and weakens the overcurrent capability of the pole.

For example, especially a cylindrical battery cell with poles provided at both ends, the poles are basically aligned with the winding holes, and the liquid injection holes that are at least partially aligned with the winding holes are difficult to avoid the poles.

If the pole and the liquid injection hole are staggered so that the pole deviates from the winding hole, on the one hand, the liquid injection hole that is at least partially aligned with the winding hole can be directly connected to the winding hole, and the liquid injected through the liquid injection hole flows directly into The winding hole and rapid diffusion to the electrode assembly improve the injection efficiency. On the other hand, since the pole and the liquid injection hole are staggered, the liquid injection hole that is at least partially aligned with the winding hole does not penetrate the pole, so that there is a larger contact area between the pole and the bus bar, and the pole is improved. overcurrent capability.

The solutions of the embodiments of the present application can be applied to, but are not limited to, battery cells, battery modules including multiple battery cells, or battery packs including battery cells or battery modules. They can also be applied to battery cells and battery packs. electrical equipment. When the liquid injection hole 1 at least partially aligned with the winding hole 21 is directly connected to the winding hole 21, the electrolyte flows directly to the winding hole 21 through the liquid injection hole 1, which improves the liquid injection efficiency of the battery cell, and The staggered liquid injection holes 1 do not penetrate the poles 6, which improves the overcurrent capacity of the poles 6 of the battery cells. The liquid injection efficiency of the battery cells and the overcurrent capacity of the pole 6 are improved, and the corresponding efficiency and overcurrent capacity of the battery cells in the corresponding battery pack are also improved. The corresponding efficiency and overcurrent capacity of the battery cells in the corresponding power consumption device are also improved. Flow capabilities are also improved.

Electrical devices are devices that use electrical energy as energy to achieve corresponding functions by consuming electrical energy. For example, the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

In the electric device according to the embodiment of the present application, the electric device may include a device main body and a power supply device. The power supply device may be used to supply power to the device main body. The power supply device may include a battery cell or a battery pack.

The main body of the device refers to the main structure that consumes electrical energy to achieve corresponding functions. For example, the electrical device can be a mobile phone, the main body of the device is a part that can realize functions such as communication, and power is supplied to the part that can realize functions such as communication through a battery cell or battery pack. For example, the power-consuming device may be a car. The main body of the device is a part that can be seated by people and can be driven on the road. Power is supplied to the part that can be seated by people and can be driven on the road through a battery cell or battery pack.

Power supply devices refer to devices that can output electrical energy. For example, electrical energy may be output through battery cells. For example, electric energy can be output through a battery pack composed of battery cells. For example, electric energy can be output through a battery module composed of battery cells.

The description is given by taking the electric device as a vehicle according to one embodiment of the present application as an example.

The vehicle provided by an embodiment of the present application may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle. A battery pack is provided inside the vehicle, and the battery pack can be placed at the bottom, head, or tail of the vehicle. The battery pack can be used to power the vehicle, for example, the battery pack can be used as the operating power source of the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, battery packs can be used for vehicle starting, navigation, and power requirements while driving.

In some embodiments of the present application, the battery pack can not only be used as the operating power supply of the vehicle, but also can be used as the driving power supply of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

In the battery pack according to the embodiment of the present application, the battery pack may include a box and a battery cell, and the battery cell is located in the box.

The box refers to a structure with an accommodation space. The battery cells are located in the box, and the battery cells of the battery pack are accommodated through the box.

The number of battery cells can be multiple, and multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series or parallel or mixed together, and then the whole composed of multiple battery cells is placed in the box. Of course, multiple battery cells can be connected in series, parallel, or mixed to form a battery module, and then multiple battery modules can be connected in series, parallel, or mixed to form a whole, and multiple battery modules can be connected in series, parallel, or mixed to form a whole. The whole is placed into the box. The battery pack may also include other structures. For example, the battery pack may further include a bus component for electrical connection between multiple battery cells.

A battery cell refers to a basic unit that can convert chemical energy and electrical energy into each other.

In the embodiment of the present application, the battery cell may be a secondary battery. The secondary battery refers to a battery cell that can be charged to activate the active material and continue to be used after the battery cell is discharged.

In the embodiment of the present application, the battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead battery, or a lithium-ion battery. Batteries, etc., the embodiments of the present application are not limited to this.

Please refer to Figures 1 to 5 for the battery cell in the embodiment of the present application. The battery cell is formed with a liquid injection hole 1. The battery cell includes an electrode assembly 2, a casing 3, an end cap assembly 4, a current collecting assembly and a pole. 6. The electrode assembly 2 has a wound structure. The electrode assembly 2 is surrounded by a winding hole 21 . The electrode assembly 2 surrounds the winding hole 21 . The liquid injection hole 1 is at least partially aligned with the winding hole 21 so that the liquid injection hole 1 Communicated with the winding hole 21. The housing 3 has a receiving cavity 31 and an installation port 32 connected with the receiving cavity 31 . The electrode assembly 2 is located in the receiving cavity 31 . The end cover assembly 4 is covered with the installation opening 32, and the liquid injection hole 1 penetrates the corresponding end cover assembly 4. The current collecting assembly is located between the electrode assembly 2 and the end cover assembly 4, and the liquid injection hole 1 penetrates the corresponding current collecting assembly. The pole 6 is installed on the end cover assembly 4. The pole 6 is electrically connected to the current collector assembly, and the corresponding pole 6 is staggered with the liquid injection hole 1.

The casing 3 refers to the structure with a certain wall thickness outside the battery cell. The casing 3 is mainly used to accommodate the electrode assembly 2, form a certain protection for the electrode assembly 2, and reduce the risk of the electrode assembly 2 being damaged due to exposure.

For example, the shape of the housing 3 may be a cuboid or a cylinder. When the shape of the housing 3 is a rectangular parallelepiped, the corresponding battery cell is a square battery cell; when the shape of the housing 3 is a cylinder, the corresponding battery cell is a cylindrical battery cell.

For example, the housing 3 may be made of metal.

For example, the metal material of the housing 3 may be aluminum.

The accommodation cavity 31 refers to the accommodation space within the housing 3 and is used to accommodate the electrode assembly 2 .

The installation opening 32 is connected with the accommodation cavity 31 , and the electrode assembly 2 can be placed into the accommodation cavity 31 of the housing 3 through the installation opening 32 .

The electrode assembly 2 is the main structure used for mutual conversion of chemical energy and electrical energy.

For example, the electrode assembly 2 may include a positive electrode piece, a negative electrode piece, and a separator. During the charging and discharging process of a battery cell, active ions (such as lithium ions) are inserted and detached 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 prevent the positive and negative electrodes from short-circuiting and allow active ions to pass through.

The winding structure refers to a structure obtained by winding and molding in one direction.

For example, the positive electrode sheet, the negative electrode sheet and the separator are rolled as a whole in one direction to form a rolled structure, and the corresponding battery cell is a rolled battery cell.

For example, the electrode assembly 2 may further include tabs, and the positive electrode piece and the negative electrode piece are electrically connected to the corresponding tabs respectively.

The winding hole 21 is formed by winding the electrode assembly 2, and the winding hole 21 formed by winding the electrode assembly 2 is a through hole.

The liquid injection hole 1 is at least partially aligned with the winding hole 21 means that along the axial projection of the liquid injection hole 1 , the projection area of the liquid injection hole 1 and the projection area of the winding hole 21 at least partially overlap, and the projected area is not completely The spacing facilitates the liquid injected through the liquid injection hole 1 to flow directly to the winding hole 21 to improve the liquid injection efficiency.

The end cover assembly 4 is a structure used to block the installation opening 32. When the electrode assembly 2 is placed in the accommodation cavity 31, the end cover assembly 4 is installed in the installation opening 32 to block the installation opening 32, thereby preventing the electrode assembly 2 from being blocked as much as possible. The installation port 32 is separated from the housing 3, which can also reduce electrolyte leakage. In addition, the end cap assembly 4 is also used to provide a location for installing the pole 6 .

The liquid injection hole 1 penetrates the corresponding end cover assembly 4, and the electrolyte flowing through the liquid injection hole 1 will not be blocked by the corresponding end cover assembly 4. The corresponding end cap assembly 4 refers to the end cap assembly 4 at the same end as the liquid injection hole 1 .

The current collecting assembly is used to collect multiple current flow paths of the electrode assembly 2 .

The liquid injection hole 1 penetrates the corresponding current collection component, and the electrolyte flowing through the liquid injection hole 1 will not be blocked by the corresponding current collection component. The corresponding current collecting component refers to the current collecting component at the same end as the liquid injection hole 1. The pole 6 electrically connected to the electrode assembly 2 is the main structure for the electrode assembly 2 to input or output electrical energy. The electrode assembly 2 can discharge outward through the pole 6 and an external charging device can charge the electrode assembly 2 through the pole 6 .

Illustratively, the pole post 6 is electrically connected to the electrode assembly 2 through a current collecting assembly.

For example, one pole 6 is a positive pole and the other pole 6 is a negative pole. The positive electrode column is electrically connected to the positive electrode piece through the corresponding current collecting assembly and the positive electrode lug, and the negative electrode column is electrically connected to the negative electrode piece through the corresponding current collecting assembly and negative electrode lug of the negative electrode.

The staggering of the corresponding pole 6 and the liquid injection hole 1 means that the corresponding pole 6 refers to the pole 6 at the same end as the liquid injection hole 1. Along the axial projection of the liquid injection hole 1, the projection area of the corresponding pole 6 and the liquid injection hole 1 are The projected areas of the liquid hole 1 do not overlap, and there is no overlapping area between the two, so that the liquid injection hole 1 does not penetrate the pole 6 .

In the battery cell of the embodiment of the present application, on the one hand, since the liquid injection hole 1 is at least partially aligned with the winding hole 21 so that the liquid injection hole 1 is connected with the winding hole 21, the liquid injection hole 1 penetrates the end cover assembly 4 and the collector. The electrolyte injected through the injection hole 1 flows to the winding hole 21 surrounded by the electrode assembly 2 in the housing 3, and infiltrates and diffuses toward the electrode assembly 2, thereby improving the injection efficiency. On the other hand, since the corresponding pole 6 is staggered with the liquid injection hole 1, it is beneficial to increase the contact area between the pole 6 and the busbar connecting multiple battery cells, and improve the overcurrent capacity of the corresponding pole 6. Therefore, the battery cells in the embodiments of the present application can not only improve the liquid injection efficiency of the battery cells, but also improve the overcurrent capacity of the poles 6 of the battery cells, thereby achieving a balance between the liquid injection efficiency of the battery cells and the battery cells. The purpose of the overcurrent capability of pole 6.

In one embodiment, please refer to Figures 1 to 4. The corresponding pole 6 can be located on one side of the liquid filling hole 1 along the radial direction of the liquid filling hole 1. The battery cell also includes a pressure relief valve installed on the corresponding end cover assembly 4. Device 7, the pressure relief device 7 can be located on the other side of the liquid injection hole 1 along the radial direction of the liquid injection hole 1.

The pressure relief device 7 refers to a structure that can discharge the gas in the accommodation cavity 31 to the outside of the housing 3 . The gas in the accommodation cavity 31 can be discharged through the pressure relief device 7 , thereby reducing the pressure in the housing 3 .

By way of example, the pressure relief device 7 is an explosion-proof valve.

By way of example, the explosion-proof valve is in the shape of a sheet.

The pole 6 is located on one side of the liquid injection hole 1 along the radial direction of the liquid injection hole 1, and the pressure relief device 7 is located on the other side of the liquid injection hole 1 along the radial direction of the liquid injection hole 1. It should be understood that: with the liquid injection hole 1 The connecting line between the center of 1 and the point determined according to the pole 6 of the corresponding end is the first connecting line 81, and the straight line perpendicular to the first connecting line 81 and coincident with the center of the liquid injection hole 1 is the dividing line 82. The pole 6 is located on one side of the dividing line 82, and the pressure relief device 7 is located on the other side of the dividing line 82.

Specifically, the number of the poles 6 at the corresponding ends is different, and the points determined according to the poles 6 at the corresponding ends will be different accordingly. When the number of poles 6 at the corresponding end of the liquid injection hole 1 is one, the point determined according to the pole 6 at the corresponding end is the center of this pole 6, and the first connecting line 81 is the center of the liquid injection hole 1 and this pole. The line connecting the center of column 6. When the number of poles 6 at the corresponding end of the liquid injection hole 1 is multiple, the point determined according to the poles 6 at the corresponding end is the geometric center of the figure formed by connecting the centers of the plurality of poles 6, and the first connection line 81 is the injection hole 1. The line connecting the center of liquid hole 1 and the geometric center.

For example, please refer to Figures 1 to 4. The number of poles 6 at the corresponding end of the liquid injection hole 1 is two, and the geometric center of the figure formed by the central connection of the plurality of poles 6 is these two poles 6. The first connection line 81 is the connection line between the center of the liquid injection hole 1 and the midpoint of the center connection line of the two pole posts 6 .

For example, please refer to Figures 1 to 4. In the figures, the conductive polarities of the poles 6 at the corresponding ends of the liquid injection hole 1 are the same.

For example, please refer to Figures 1 to 4. In the figures, the conductive polarity of the pole 6 at the corresponding end of the liquid injection hole 1 is all negative.

For example, when the number of poles 6 at the corresponding end of the injection hole 1 is greater than two, the geometric center of the figure formed by the center lines of the plurality of poles 6 is a polygon surrounded by the center lines of the plurality of poles 6 the geometric center.

In the embodiment of the present application, the pole 6 is located on one radial side of the liquid injection hole 1, and the pressure relief device 7 is on the other side, so that the pressure relief device 7 and the pole 6 are far apart, making it easier to separate the pressure relief devices. 7 and pole 6 for installation. Furthermore, the pressure relief device 7 and the pole 6 are far apart, which is beneficial to keeping the high-temperature gas discharged from the pressure relief device 7 away from the pole 6 and reducing the risk of the high-temperature gas discharged from the pressure relief device 7 damaging the insulating material of the pole 6 .

In one embodiment, the pole 6 and the pressure relief device 7 may be located on the same side of the liquid injection hole 1 along the radial direction of the liquid injection hole 1 .

In one embodiment, the corresponding pole 6 , the liquid injection hole 1 and the pressure relief device 7 are arranged in sequence along the radial direction of the liquid injection hole 1 .

The corresponding pole 6, liquid injection hole 1 and pressure relief device 7 are arranged in sequence along the radial direction of the liquid injection hole 1, which should be understood as: taking the center of the liquid injection hole 1, the center of the pressure relief device 7 and the pole 6 according to the corresponding end The determined points are roughly on a straight line.

In the embodiment of the present application, the pressure relief device 7 can be as far away from the pole 6 as possible, which facilitates the installation of the pole 6 and the pressure relief device 7 and reduces the risk of damage to the insulating material of the pole 6 .

In one embodiment, the corresponding pole 6, the liquid injection hole 1 and the pressure relief device 7 are not limited to being arranged sequentially along the radial direction of the liquid injection hole 1. Specifically, the center of the pressure relief device 7 can be offset from the first connection line 81 .

In one embodiment, please refer to Figures 1, 4 and 5. The adapter piece 52 is not shown in Figure 1, and the collecting plate 51 is not shown in Figure 4. The current collecting assembly also includes a current collecting plate 51 and an adapter piece 52 located between the current collecting plate 51 and the pole 6. The adapter piece 52 is electrically connected to the current collecting plate 51 and the pole 6 respectively. The current collecting plate 51 and the electrode The components 2 are electrically connected, and the liquid injection hole 1 penetrates the corresponding adapter piece 52 and the corresponding current collecting plate 51 .

The adapter piece 52 is electrically connected to the current collecting plate 51 and the pole 6 respectively. The adapter piece 52 plays a transition role between the current collecting plate 51 and the pole 6 and transmits electric energy between the current collecting plate 51 and the pole 6 , when there is a certain deviation between the current collecting plate 51 and the pole 6 , it is suitable to electrically connect the current collecting plate 51 and the pole 6 through the adapter piece 52 . The corresponding adapter piece 52 refers to the adapter piece 52 at the same end as the liquid injection hole 1 .

By way of example, the plurality of tabs of the electrode assembly 2 are electrically connected to the current collecting plate 51 .

Exemplarily, at least one of the pole tabs is a positive pole tab, at least one of the pole tabs is a negative pole tab, at least one current collecting plate 51 is a positive electrode current collecting plate, at least one current collecting plate 51 is a negative electrode current collecting plate, the positive electrode tab and the positive electrode The sheets are electrically connected, the positive electrode current collector plate is electrically connected to a plurality of positive electrode ears, the negative electrode ears are electrically connected to the negative electrode sheets, and the negative electrode current collector plate is electrically connected to a plurality of negative electrode ears.

The liquid injection hole 1 penetrates the corresponding current collecting plate 51 and the adapter piece 52 , and the electrolyte flowing through the liquid injection hole 1 will not be blocked by the corresponding current collecting plate 51 and the adapter piece 52 . The corresponding current collecting plate 51 refers to the current collecting plate 51 at the same end as the liquid injection hole 1 .

In the embodiment of the present application, the adapter piece 52 is electrically connected to the current collecting plate 51 and the pole 6 to transfer electric energy between the current collecting plate 51 and the pole 6 . The adapter piece 52 is located between the current collecting plate 51 and the pole 6 . During this time, the electrolyte flowing from the liquid injection hole 1 to the winding hole 21 passes through the adapter piece 52. The liquid injection hole 1 penetrates the adapter piece 52, which is conducive to the electrolyte injected from the liquid injection hole 1 flowing directly to the winding hole 21, reducing the electrolyte being absorbed. The possibility of blocking by the adapter piece 52 is beneficial to improving the liquid injection efficiency.

In one embodiment, the current collecting assembly may not be provided with the adapter piece 52 , the current collecting plate 51 is connected to the pole 6 to achieve electrical connection between the two, and the liquid injection hole 1 penetrates the corresponding current collecting plate 51 .

In one embodiment, the collecting plate 51 may deviate from the position of the liquid injection hole 1 , and the liquid injection hole 1 may penetrate the adapter piece 52 but not penetrate the collecting plate 51 .

In one embodiment, please refer to FIG. 2 and FIG. 4 , the end cover assembly 4 includes a cover body 41 and an insulating member 42 . The cover 41 covers the installation opening 32 , and the liquid injection hole 1 and the corresponding pole 6 both penetrate the corresponding cover 41 . The insulating member 42 is located between the cover 41 and the current collecting assembly. The liquid injection hole 1 and the corresponding pole 6 both penetrate the corresponding insulating member 42 .

The cover 41 covers the installation opening 32. The installation opening 32 is blocked by the cover 41, thereby reducing the possibility of the battery cores being detached from the housing 3. The cover 41 covering the installation opening 32 can reduce electrolyte leakage from the housing 3. risks of. The corresponding cover 41 refers to the cover 41 at the same end as the liquid injection hole 1 .

For example, the cover 41 is made of metal.

For example, the cover 41 is made of aluminum.

The insulating member 42 is located between the cover 41 and the current collecting assembly, and is used to insulate the cover 41 and the current collecting assembly and reduce the possibility of conduction between the cover 41 and the current collecting assembly as much as possible. The corresponding insulating member 42 is the insulating member 42 at the same end as the liquid injection hole 1 .

Illustratively, the insulating member 42 is plastic.

In the embodiment of the present application, the pole 6 penetrates the cover 41 and the insulator 42 so that the current collecting component located on the side of the insulator 42 away from the cover 41 can be electrically connected to the pole 6 . The liquid injection hole 1 penetrates the corresponding cover 41 and the corresponding insulator 42 so that the electrolyte injected from the liquid injection hole 1 can flow smoothly to the winding hole 21 through the cover 41 and the insulator 42, which is beneficial to improving the liquid injection efficiency.

It can be understood that the embodiment of the present application is not limited to the liquid injection hole 1 penetrating the corresponding cover 41 and the corresponding insulator 42. The end cover assembly 4 can have other structural forms, so that the liquid injection hole 1 penetrates the end cover assembly 4 such that It suffices that the liquid injection hole 1 can communicate with the winding hole 21 .

In one embodiment, please refer to Figure 5. The number of installation openings 32 is one. The pole 6 with positive conductive polarity and the pole 6 with negative conductive polarity are both installed on the same end cap assembly 4. Injection liquid The hole 1 penetrates the current collecting plate 51 with positive conductive polarity and the current collecting plate 51 with negative conductive polarity.

Conductive polarity refers to the positive or negative pole of the battery. The positive polarity of the conductor refers to the positive pole, and the negative polarity of the conductor refers to the negative pole.

Please refer to Figure 5. The pole 6 with positive conductive polarity and the pole 6 with negative conduction polarity are both installed on the same end cover assembly 4, that is, the pole 6 with positive conductive polarity and the pole 6 with negative conductivity are installed on the same end cover assembly 4. The negative poles 6 are located at the same end of the housing 3 .

The current collecting plate 51 with positive conductive polarity is the positive current collecting plate, and the current collecting plate 51 with negative conductive polarity is the negative current collecting plate.

In the embodiment of the present application, since the positive pole and the negative pole are on the same end cap assembly 4, the current collecting plate 51 with positive conductive polarity and the current collecting plate 51 with negative conductive polarity are located between the end cover assembly 4 and the electrode. Between the components 2, the injection hole 1 penetrates the current collecting plate 51 with positive conductive polarity and the current collecting plate 51 with negative conductive polarity, which can reduce the current collecting plate 51 with positive conductive polarity and the negative conductive polarity. The current collecting plate 51 blocks the electrolyte, so that the electrolyte injected from the liquid injection hole 1 can flow to the winding hole 21 through the current collecting plate 51 with positive conductive polarity and the current collecting plate 51 with negative conductive polarity, improving Liquid injection efficiency.

In one embodiment, please refer to Figure 1. Mounting ports 32 are provided at both ends of the housing 3. The mounting ports 32 at each end are correspondingly provided with an end cover assembly 4, a current collecting assembly, a pole 6, and a liquid injection hole 1. The installation opening 32 that runs through one end corresponds to the end cover assembly 4 and the collecting plate 51 .

Exemplarily, the installation port 32 at one end of the two-end installation port 32 is provided with a positive pole, a positive current collecting plate in the current collecting assembly, and a corresponding end cover assembly 4, and the installation port at the other end of the two-end installation port 32 is provided with 32 is provided with a negative electrode column, a negative electrode current collecting plate in the current collecting assembly and a corresponding end cap assembly 4.

In the embodiment of the present application, the winding hole 21 formed by winding the electrode assembly 2 is a through hole. If the liquid injection hole 1 is provided correspondingly at either end of the mounting port 32, the winding hole 21 can be smoothly inserted into the winding hole 21. Inject the electrolyte. Therefore, the liquid injection hole 1 passes through the end cover assembly 4 and the current collection plate 51 corresponding to the installation port 32 at one end, so that the electrolyte injected from the liquid injection hole 1 can pass through the end cover assembly 4 and the current collection pan 51 at the corresponding end. 51 flows to the winding hole 21. The liquid injection hole 1 does not penetrate the current collecting plate 51 at the other end, and the current collecting plate 51 at the other end does not need corresponding openings, which can simplify the structure of the current collecting plate 51 at the other end and reduce the difficulty of processing.

In one embodiment, a liquid injection hole 1 can be provided at the installation port 32 at each end, and the liquid injection hole 1 is provided at both ends of the housing 3 .

In one embodiment, please refer to FIG. 1 , the battery cell may be a cylindrical battery cell.

The battery cell is a cylindrical battery cell, and accordingly the electrode assembly 2 is rolled into a cylindrical shape. The winding hole 21 of the battery assembly is not flattened, and the space of the winding hole 21 is larger.

In the embodiment of the present application, the winding hole 21 of the cylindrical battery cell has a larger space, which is conducive to receiving the electrolyte injected from the liquid injection hole 1 more smoothly, and is conducive to improving the liquid injection efficiency of the battery cell.

It can be understood that the battery cells in the embodiments of the present application are not limited to cylindrical battery cells. In one embodiment, the battery cells may be prismatic battery cells.

Please refer to Figures 1 to 4 for the battery cell in the embodiment of the present application. The battery cell includes an electrode assembly 2, a casing 3, an end cover assembly 4, a current collecting assembly and a pole 6. The electrode assembly 2 has a wound structure. The electrode assembly 2 is surrounded by a winding hole 21 . The electrode assembly 2 surrounds the winding hole 21 . The liquid injection hole 1 is at least partially aligned with the winding hole 21 so that the liquid injection hole 1 Communicated with the winding hole 21. The electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet and a separator. The separator separates the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the negative electrode sheet and the separator are wound as a whole to form a winding hole 21. The positive electrode sheet and the negative electrode are The sheet and separator are rolled into a cylindrical electrode assembly 2 as a whole. The electrode assembly 2 also includes a plurality of pole tabs, the positive electrode piece is connected to the corresponding plurality of pole tabs, and the negative electrode piece is connected to the corresponding plurality of pole tabs. The housing 3 has a receiving cavity 31 and an installation port 32 connected with the receiving cavity 31 . The electrode assembly 2 is located in the receiving cavity 31 . Housing 3 is an aluminum shell. The housing 3 is cylindrical, and both axial ends of the housing 3 are provided with installation openings 32 . The end cover assembly 4 is located at the installation opening 32. The end cover assembly 4 includes a cover body 41 and an insulating member 42. The cover body 41 is located at the installation opening 32. The liquid injection hole 1 and the pole 6 both pass through the cover body 41, and the insulating member 42 is located between the cover 41 and the current collection assembly. The liquid injection hole 1 and the pole 6 both penetrate the insulating member 42. The liquid injection hole 1 is located at one axial end of the housing 3. The current collecting assembly is located between the electrode assembly 2 and the end cover assembly 4. The current collecting assembly includes a current collecting plate 51 and an adapter piece 52. The tabs, current collecting plate 51, adapter piece 52 and pole post 6 are electrically connected in sequence. Note The liquid hole 1 penetrates the negative electrode current collecting plate and the corresponding adapter piece 52 .

For example, the pole 6 , the liquid injection hole 1 and the pressure relief device 7 are arranged in sequence along the radial direction of the liquid injection hole 1 .

The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; 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 implement the foregoing implementations. The technical solutions described in the examples are modified, or some or all of the technical features are equivalently replaced; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions in the embodiments of this application, which should all be covered Within the scope of the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery cell, wherein a liquid injection hole is formed, the battery cell comprising:

an electrode assembly in a coiled configuration, the electrode assembly surrounding a coiled aperture, the electrode assembly surrounding the coiled aperture, the fill aperture being at least partially aligned with the coiled aperture such that the fill aperture is in communication with the coiled aperture;

a case having a receiving cavity in which the electrode assembly is located, and a mounting port communicating with the receiving cavity;

the end cover assembly is covered on the mounting port, and the liquid injection hole penetrates through the corresponding end cover assembly;

the current collecting assembly is positioned between the electrode assembly and the end cover assembly, and the liquid injection hole penetrates through the corresponding current collecting assembly;

the pole is installed in the end cover assembly, the pole with the mass flow subassembly electricity is connected, corresponds the pole with annotate the liquid hole staggers.

2. The battery cell of claim 1, wherein the post is located on one side of the fill hole in a radial direction of the fill hole, the battery cell further comprising a pressure relief device mounted to the end cap assembly, the pressure relief device being located on the other side of the fill hole in a radial direction of the fill hole.

3. The battery cell of claim 2, wherein the post, the fluid injection hole, and the pressure relief device are arranged in sequence along a radial direction of the fluid injection hole.

4. A battery cell according to any one of claims 1 to 3, wherein the current collecting assembly further comprises a current collecting plate and a transfer tab located between the current collecting plate and the post, the transfer tab being electrically connected to the current collecting plate and the post, respectively, the current collecting plate and the electrode assembly being electrically connected, and the liquid injection hole penetrating through the corresponding transfer tab and the corresponding current collecting plate.

5. A battery cell according to any one of claims 1 to 3, wherein the end cap assembly comprises:

the cover body is covered on the mounting opening, and the liquid injection hole and the corresponding polar column penetrate through the corresponding cover body;

the insulating piece is positioned between the cover body and the current collecting assembly, and the liquid injection hole and the corresponding pole column penetrate through the insulating piece.

6. A battery cell according to any one of claims 1 to 3, wherein the number of the mounting openings is one, the positive and negative conductive electrode posts are mounted on the same end cap assembly, and the liquid injection hole penetrates through the positive and negative conductive current collecting assemblies.

7. A battery cell according to any one of claims 1 to 3, wherein the mounting openings are formed in both ends of the housing, the end cap assembly, the current collecting assembly and the pole are correspondingly formed at the mounting opening of each end, and the liquid injection hole penetrates through the end cap assembly and the current collecting assembly corresponding to the mounting opening of one end.

8. A battery cell according to any one of claims 1 to 3, wherein the battery cell is a cylindrical battery cell.

9. A battery pack, comprising:

a case;

the battery cell according to any one of claims 1 to 8, located within the case.

10. An electrical device, comprising:

a device body;

a power supply device for supplying power to the apparatus main body, the power supply device comprising the battery cell according to any one of claims 1 to 8 or the battery pack according to claim 9.