Tab, battery cell, battery and electric equipment

Abstract

The utility model discloses a tab, a battery cell, a battery and electric equipment, relates to the technical field of vehicles, and aims to solve the problems of serious heating and higher temperature of the tab when the battery is charged. The tab is suitable for a battery cell of the battery, the tab comprises a connecting part and a bending part, and the connecting part is suitable for being connected with the battery cell; the bending part is connected to one side, deviating from the battery cell, of the body, at least one side of the bending part is provided with a conductive piece, and the conductive piece is electrically conducted with the bending part.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to electrode tabs, battery cells, batteries and electrical equipment. Background Technology

[0002] New energy electric vehicles are green transportation tools powered by electric energy. One of the main problems in the development of new energy electric vehicles is the long charging time. To solve the problem of fast charging of new energy electric vehicles, it is necessary to increase the power of charging piles and improve the charging voltage and charging current output of the charging piles.

[0003] Because the current flowing through the electrode core is extremely large during charging, the heat generation power of the electrode core tab will increase significantly. Since the resistance and heat capacity at the tab are relatively large, the temperature of the tab during fast charging is significantly higher than the average temperature of the electrode core. This causes the heat generated by the tab to be transferred to the electrode core in contact with it, increasing the risk of lithium plating in the electrode core and reducing the lifespan and safety of the electrode core.

[0004] Therefore, the problem of the battery tabs getting very hot during charging is something that needs to be addressed. Utility Model Content

[0005] The purpose of this utility model is to provide a tab, a battery cell, a battery, and an electrical device, which aims to solve the problem of severe heat generation and high temperature of the tab during battery charging.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect of this application, a tab is provided, which is suitable for a battery cell. The tab includes a connecting portion and a bending portion. The connecting portion is adapted to be connected to the battery cell. The bending portion is connected to the side of the body away from the battery cell. At least one side of the bending portion is provided with a conductive element, which is electrically connected to the bending portion.

[0008] This application provides a conductive element on at least one side of the bending portion, which is electrically connected to the bending portion. Current can pass not only through the bending portion but also through the conductive element, thereby reducing the resistance at the tab and lowering the temperature of the tab, thus preventing the tab from overheating and seriously affecting the lifespan and safety of the battery cell.

[0009] In some embodiments of this application, the conductive element is electrically connected to the bending portion and has at least one connection area; the connection area is located in the non-bending area of ​​the bending portion.

[0010] Therefore, by placing the connection area in the non-bending area, it is possible to avoid the conductive parts in the connection area being at the bending point when the bending part is bent, which would increase the stress on the conductive parts in the connection area and pose a risk of breakage or short circuit.

[0011] In some embodiments of this application, both the conductive element and the bent portion are sheet-like, and the conductive element and the bent portion are stacked together.

[0012] By stacking the conductive component and the bending part, the contact area between the conductive component and the bending part can be increased, making the connection between the conductive component and the bending part more secure and preventing the conductive component from falling off.

[0013] In some embodiments of this application, at least one connection region includes: a first connection region and a second connection region, wherein the first connection region and the second connection region are spaced apart along the extension direction of the bend.

[0014] In this way, by setting the first connection area and the second connection area at intervals along the extension direction of the bending portion, the current flowing through the tab can be stably diverted by the conductive component. It can also keep the middle part of the first connection area and the second connection area separate from the bending portion, that is, the bending portion has space for relative movement when bending, thus avoiding stress on the conductive component when the bending portion is bent.

[0015] In some embodiments of this application, the first connection region and the second connection region are located at the two ends of the conductive element, respectively.

[0016] In this way, by placing the first connection area and the second connection area at the two ends of the conductive component, the connection between the conductive component and the bent part can be made more secure, preventing the conductive component from falling off when the ends are subjected to friction or impact, thus preventing the conductive component from working properly.

[0017] In some embodiments of this application, the thickness of the conductive element is less than or equal to 0.5 mm.

[0018] This avoids the conductive parts being too thick, which would increase the stress when bending the part and make it difficult to bend.

[0019] In some embodiments of this application, the conductive element is formed by stacking one or more conductive sheets along the thickness direction.

[0020] In this way, conductive components of different thicknesses can be stacked according to different numbers of conductive sheets, and users can select conductive components of different thicknesses as needed.

[0021] In some embodiments of this application, the thickness of the conductive sheet is greater than or equal to 0.001 mm and less than or equal to 0.5 mm.

[0022] This avoids the problem of the conductive sheet being too thin, making it difficult to connect multiple conductive sheets.

[0023] In some embodiments of this application, the conductive element is a copper element or an aluminum element.

[0024] In this way, copper and aluminum have better conductivity, which can reduce the voltage of the tabs, avoid the specific heat capacity of the tab bending part, reduce the temperature at the tabs, and prevent the tabs from overheating and seriously affecting the life and safety of the battery cell.

[0025] In some embodiments of this application, at least one conductive element includes: a first conductive element and a second conductive element, wherein the first conductive element and the second conductive element are respectively disposed on opposite sides in the thickness direction of the bent portion.

[0026] In this way, the first conductive element and the second conductive element are respectively disposed on opposite sides of the thickness direction of the bending part, which can further reduce the voltage of the tab, avoid the specific heat capacity of the bending part of the tab, reduce the temperature at the tab, and prevent the tab from overheating and seriously affecting the life and safety of the cell.

[0027] In a second aspect of this application, a battery cell is provided, comprising: a battery cell body and a tab; the tab is electrically connected to the battery cell body.

[0028] Since the battery cell provided in this application includes the tabs as described above, it can solve the same problem and achieve the same effect, and will not be described in detail here.

[0029] In a third aspect of this application, a battery is provided, including the aforementioned tabs or cells.

[0030] Since the battery provided in this application includes the tabs or cells as described above, it can solve the same problem and achieve the same effect, and will not be described in detail here.

[0031] In a fourth aspect of this application, an electrical device is provided, including the aforementioned tabs, or a battery cell, or a battery.

[0032] Since the electrical devices provided in this application include the tabs, cells, or batteries as described above, they can solve the same problems and achieve the same effects, and will not be described in detail here. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the electrode structure is provided for this application;

[0035] Figure 2 This application provides Figure 1 Side view of the bent portion of the middle electrode ear unfolded;

[0036] Figure 3 This application provides Figure 1 A top view of the bent portion of the middle electrode ear unfolded;

[0037] Figure 4 This application provides Figure 1 Side view of the middle pole ear.

[0038] Reference numerals: 100, tab; 10, connecting part; 20, bending part; 30, conductive element; 31, first conductive element; 32, second conductive element; 40, connecting area; 41, first connecting area; 42, second connecting area. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationship shown in the accompanying drawings is satisfied.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0044] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0045] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0046] New energy electric vehicles are green transportation tools powered by electric energy. One of the main problems in the development of new energy electric vehicles is the long charging time. To solve the problem of fast charging of new energy electric vehicles, it is necessary to increase the power of charging piles and improve the charging voltage and charging current output of the charging piles.

[0047] Because the current flowing through the electrode core is extremely large during charging, the heat generation power of the electrode core tab will increase significantly. Since the resistance at the tab is large and the heat capacity is small, the temperature of the tab during fast charging is significantly higher than the average temperature of the electrode core. This causes the heat generated by the tab to be transferred to the electrode core in contact with it, increasing the risk of lithium plating in the electrode core and reducing the lifespan and safety of the electrode core.

[0048] This application provides an electrical device, such as a vehicle or an aircraft. For ease of description, this application will use a vehicle as an example below.

[0049] The vehicle can be either a new energy vehicle or a hybrid vehicle; this application does not limit the specific type of vehicle.

[0050] A vehicle may include an electric drive unit, a power supply unit, a vehicle body, and a charging unit. The electric drive unit includes a motor, a controller, a power converter, etc., which is responsible for converting electrical energy into mechanical energy to drive the vehicle.

[0051] Power supply devices, including batteries and fuel cells, provide energy for electrically driven devices.

[0052] The vehicle body includes the body shell, passenger compartment, and chassis. The body material is usually made of lightweight metal or high-strength plastic to reduce the overall weight of the vehicle and improve energy efficiency.

[0053] The charging device includes a charging equipment and a charging port. The charging equipment is used to connect an external power source and the charging port to charge the battery pack.

[0054] This application also provides a battery for use in the aforementioned vehicle. The battery can be a lead-acid battery, a nickel-metal hydride battery, or a lithium-ion battery, etc. The battery can include: a casing, a cell, and an electrolyte.

[0055] The outer casing primarily serves to protect the internal battery cells and other components. Its strong mechanical properties prevent damage from external forces such as impacts and pressure.

[0056] The battery cell is the core unit for battery energy storage. During charging, electrical energy from an external power source is transferred to the cell through the battery management system. Under the influence of an electric field, lithium ions are released from the positive electrode, migrate through the electrolyte and separator to the negative electrode, and simultaneously, electrons reach the negative electrode through the external circuit, where they combine with lithium ions and are stored. During discharging, the chemical energy stored in the cell is converted into electrical energy. At this time, lithium ions are released from the negative electrode, pass through the electrolyte and separator back to the positive electrode, while electrons flow from the negative electrode to the positive electrode through the external circuit, providing power for the motor and other equipment in electric vehicles.

[0057] A battery cell also includes a positive electrode, a negative electrode, a separator, and tabs.

[0058] The positive and negative electrodes are used to conduct current, ensuring that the battery cell can effectively carry out electrochemical reactions during charging and discharging.

[0059] The separator is located between the positive and negative electrodes. Its main function is to prevent the positive and negative electrodes from coming into direct contact and short-circuiting, while allowing lithium ions to move freely in the electrolyte.

[0060] The tabs are components that draw current from inside the battery cell, connecting the positive and negative terminals of the cell to the external circuit, enabling the cell to be electrically connected to other parts of the battery or external devices to achieve charging and discharging functions.

[0061] To achieve the above objectives, such as Figure 1 As shown, this application also provides a tab 100 suitable for a battery cell. The tab 100 includes a connecting portion 10 and a bending portion 20. The connecting portion 10 is adapted to be connected to the battery cell. The bending portion 20 is connected to the side of the body away from the battery cell. At least one side of the bending portion 20 is provided with a conductive element 30, and the conductive element 30 is electrically connected to the bending portion 20.

[0062] The connecting part 10 and the bending part 20 can be made of copper or aluminum, etc. The materials of the connecting part 10 and the bending part 20 can be the same or different, and this application does not limit them.

[0063] The conductive element 30 can also be made of copper or aluminum, and the materials of the conductive element 30, the connecting part 10 and the bending part 20 can be the same or different. This application does not limit this.

[0064] It should be noted that the bending portion 20 is to reduce the extension length of the tab 100 and make the tab 100 easier to install. The bending portion 20 can be bent to fit the installation shape, or it can be installed directly without bending. This application does not limit this.

[0065] This application provides a conductive element 30 on at least one side of the bending portion 20. The conductive element 30 is electrically connected to the bending portion 20, so that the current can pass not only through the bending portion 20 but also through the conductive element 30, thereby reducing the resistance at the tab 100 and lowering the temperature of the tab 100, thus preventing the tab 100 from overheating and seriously affecting the life and safety of the battery cell.

[0066] In some embodiments of this application, such as Figure 2 As shown, the conductive element 30 is electrically connected to the bent portion 20 and has at least one connection area 40; the connection area 40 is located in the non-bending area of ​​the bent portion 20.

[0067] The connecting area 40 can be square, circular or other shapes, and this application does not limit it.

[0068] By placing the connection area 40 in the non-bending area, it is possible to avoid the conductive component 30 of the connection area 40 being at the bending point when the bending part 20 is bent, which would increase the stress on the conductive component 30 of the connection area 40 and pose a risk of breakage or short circuit.

[0069] In some embodiments of this application, the conductive element 30 and the bent portion 20 are connected by ultrasonic welding.

[0070] Thus, ultrasonic welding has advantages such as good welding quality and fast welding speed, which can make the connection between the conductive part 30 and the bent part 20 tighter, shorten the welding time, reduce the processing time, and improve the connection efficiency between the conductive part 30 and the bent part 20.

[0071] In addition, the connection method between the conductive part 30 and the bent part 20 can be welding, bolting, or conductive adhesive, etc., and this application does not limit it.

[0072] In some embodiments of this application, such as Figure 2As shown, both the conductive element 30 and the bent portion 20 are sheet-like, and the conductive element 30 and the bent portion 20 are stacked together.

[0073] In this way, by stacking the conductive component 30 and the bending portion 20, the contact area between the conductive component 30 and the bending portion 20 can be increased, making the connection between the conductive component 30 and the bending portion 20 more secure and preventing the conductive component 30 from falling off.

[0074] In some embodiments of this application, both the conductive element 30 and the bent portion 20 are sheet-like, and the conductive element 30 and the bent portion 20 are conformally configured.

[0075] In this way, the connection between the conductive part 30 and the bending part 20 can be made tighter, preventing the conductive part 30 from falling off, which would cause the temperature of the bending part 20 to rise and affect the normal use of the tab 100.

[0076] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, at least one connection region 40 includes: a first connection region 41 and a second connection region 42, the first connection region 41 and the second connection region 42 being spaced apart along the extension direction of the bending portion 20.

[0077] The at least one connection region 40 may also include a third connection region 40 or a fourth connection region 40, etc., which is not limited in this application.

[0078] Thus, by arranging the first connecting region 41 and the second connecting region 42 at intervals along the extension direction of the bending portion 20, the current flowing through the tab 100 can be stably diverted by the conductive element 30. It also ensures that the middle portion of the first connecting region 41 and the second connecting region 42 remains separated from the bending portion 20, meaning that the bending portion 20 has space for relative movement when bent, thus preventing the conductive element 30 from being subjected to stress when the bending portion 20 is bent.

[0079] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, both the first connecting region 41 and the second connecting region 42 are strip-shaped, and the length direction of the first connecting region 41 is perpendicular to the extension direction of the bending portion 20, and the length direction of the second connecting region 42 is perpendicular to the extension direction of the bending portion 20.

[0080] In this way, the connection between the conductive component 30 and the bent portion 20 can be made more secure, preventing the end of the conductive component 30 from falling off when subjected to friction or impact, thus preventing the conductive component 30 from working properly. It can also make the first connection area 41 and the second connection area 42 avoid the bending area of ​​the bent portion 20.

[0081] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, the first connection region 41 and the second connection region 42 are located at the two ends of the conductive element 30, respectively.

[0082] Thus, by placing the first connecting area 41 and the second connecting area 42 at the two ends of the conductive element 30, the connection between the conductive element 30 and the bent portion 20 can be made more secure, preventing the conductive element 30 from falling off when the ends are subjected to friction or impact, thus preventing the conductive element 30 from working properly.

[0083] In some embodiments of this application, the thickness of the conductive element 30 is less than or equal to 0.5 mm.

[0084] The thickness of the conductive element 30 can be 0.5mm, 0.3mm, 0.2mm or 0.1mm, etc., and this application does not limit it.

[0085] In this way, the thickness of the conductive part 30 can be avoided, which would cause the stress of the bending part 20 to increase when bending, making it difficult to bend the bending part 20.

[0086] In some embodiments of this application, the conductive element 30 is formed by stacking one or more conductive sheets along the thickness direction.

[0087] In this way, conductive parts 30 of different thicknesses can be stacked according to different numbers of conductive sheets, and users can select conductive parts 30 of different thicknesses as needed.

[0088] In some embodiments of this application, the thickness of the conductive sheet is greater than or equal to 0.001 mm and less than or equal to 0.5 mm.

[0089] The thickness of the conductive sheet can be 0.001mm, 0.005mm, 0.01mm, 0.02mm, 0.1mm, 0.2mm, 0.3mm or 0.5mm, etc., and this application does not limit it.

[0090] This avoids the problem of the conductive sheet being too thin, making it difficult to connect multiple conductive sheets.

[0091] In some embodiments of this application, the conductive element 30 is made of copper or aluminum.

[0092] In this way, copper and aluminum have better conductivity, which can reduce the voltage of tab 100, avoid the specific heat capacity of the bent part 20 of tab 100, reduce the temperature at tab 100, and prevent tab 100 from overheating and seriously affecting the life and safety of the battery cell.

[0093] In some embodiments of this application, both the conductive element 30 and the bent portion 20 are made of copper.

[0094] In this way, not only can the voltage of the tab 100 be reduced, the specific heat capacity of the bent part 20 of the tab 100 be reduced, and the temperature at the tab 100 be lowered, so as to prevent the tab 100 from overheating and seriously affecting the life and safety of the battery cell, but also the chemical reaction between the conductive part 30 and the bent part 20 can be avoided, which would prevent the tab 100 from working properly.

[0095] In some embodiments of this application, such as Figure 2 and Figure 4 As shown, at least one conductive element 30 includes: a first conductive element 31 and a second conductive element 32, wherein the first conductive element 31 and the second conductive element 32 are respectively disposed on opposite sides in the thickness direction of the bent portion 20.

[0096] The materials of the first conductive element 31 and the second conductive element 32 may be the same or different, and this application does not limit this.

[0097] Thus, the first conductive element 31 and the second conductive element 32 are respectively disposed on opposite sides of the bending portion 20 in the thickness direction, which can further reduce the voltage of the tab 100, avoid the specific heat capacity of the bending portion 20 of the tab 100, reduce the temperature at the tab 100, and prevent the tab 100 from overheating and seriously affecting the life and safety of the battery cell.

[0098] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A tab, characterized by, The application relates to a battery cell suitable for a battery cell, and the tab comprises: a connecting part (10) suitable for connecting with the battery cell; a bending part (20) connected to one side of the connecting part (10) away from the battery cell, wherein at least one side of the bending part (20) is provided with an electrically conductive part (30) in electrical connection with the bending part (20).

2. The tab of claim 1, wherein The electrically conductive part (30) is in electrical connection with the bending part (20) and has at least one connecting area (40); the connecting area (40) is located in a non-bending area of the bending part (20).

3. The tab of claim 2, wherein, The electrically conductive part (30) and the bending part (20) are both in the form of a sheet, and the electrically conductive part (30) and the bending part (20) are arranged in a laminated manner.

4. The tab of claim 1, wherein The at least one connecting area (40) comprises: a first connecting area (41) and a second connecting area (42), wherein the first connecting area (41) and the second connecting area (42) are arranged along the extension direction of the bending part (20).

5. The tab of claim 4, wherein, The first connecting area (41) and the second connecting area (42) are respectively located at the two end portions of the electrically conductive part (30).

6. The tab of claim 1, wherein The thickness of the electrically conductive part (30) is less than or equal to 0.5mm.

7. The tab of claim 3, wherein The electrically conductive part (30) is formed by stacking one or more electrically conductive sheets in the thickness direction.

8. The tab of claim 7, wherein, The thickness of the electrically conductive sheet is greater than or equal to 0.001mm and less than or equal to 0.5mm.

9. The tab of claim 1, wherein, The electrically conductive part (30) is a copper part or an aluminum part.

10. The tab of claim 1, wherein The at least one electrically conductive part (30) comprises: a first electrically conductive part (31) and a second electrically conductive part (32), wherein the first electrically conductive part (31) and the second electrically conductive part (32) are respectively arranged on the opposite sides in the thickness direction of the bending part (20).

11. An electric cell characterized by The application relates to a battery cell suitable for a battery cell, and the tab comprises: a battery cell body and the tab (100) according to any one of claims 1-10; the tab (100) is in electrical connection with the battery cell body.

12. A battery, characterized by The application relates to a battery cell suitable for a battery cell, and the tab comprises:

13. An electrical device, characterized by The application relates to a battery cell suitable for a battery cell, and the tab comprises:

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