Battery monomer, battery and electric device

Abstract

The present application relates to a battery cell, a battery and a power utilization device, the battery cell comprising: a housing having a first wall; the electrode assembly is arranged in the shell, and the electrode assembly is provided with a tab connected with the first wall; and the supporting piece comprises a supporting part, the supporting part is arranged between the first wall and the electrode assembly and is provided with an elastic area and a supporting area, the elastic area surrounds at least part of the tab, and the supporting area is connected between the elastic area and the shell. According to the electrode assembly, the elastic area of the supporting piece can support the tab and reduce the probability that the tab collapses or tilts and the like, and can also provide an extension space for the tab through the elastic potential energy of the supporting piece when the electrode assembly expands, so that the probability that the root part of the tab is pulled to crack is reduced, and the reliability of the electrode assembly is improved. Therefore, the overall stability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In the structure of a battery cell, the electrode assembly is electrically connected to the top cover through the tabs to achieve the input and output of electrical energy. During the cycle of the battery cell, the electrode assembly will expand, and after expansion, it is easy to pull the tabs, causing cracks at the base of the tabs. Therefore, it is necessary to appropriately increase the length of the tabs and set the tabs to a redundant state. However, when the tabs are redundant, problems such as sagging or warping are prone to occur, affecting the performance of the battery cell. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell, a battery and an electrical device to address the problem that the redundant design of the tabs easily causes sagging or warping, thereby affecting the performance of the battery cell.

[0004] In a first aspect, the present application provides a battery cell, comprising:

[0005] a housing having a first wall;

[0006] An electrode assembly is disposed inside the housing, and the electrode assembly has a tab connected to the first wall; and

[0007] The support member includes a support portion for supporting the pole ear, the support portion is arranged between the first wall and the electrode assembly, and has an elastic area and a support area, the elastic area surrounds at least part of the pole ear, and the support area is connected between the elastic area and the shell.

[0008] Through the above structure, not only can the redundant part of the pole ear be supported, reducing the probability of the pole ear sagging or warping due to excessive length, but also when the electrode assembly expands, the elastic potential energy of the elastic zone can be used to provide expansion space for the pole ear, reducing the probability of cracking due to pulling at the root of the pole ear, thereby improving the overall stability of the battery cell.

[0009] In some embodiments, the support member also includes a main body, the support area is connected to the outer shell through the main body, the support part includes a first sub-part, the first sub-part has an elastic area and a support area, and the elastic area of ​​the first sub-part and the main body are spaced apart to form a first accommodating gap for accommodating the pole ear.

[0010] Through the above structure, a first accommodation gap is formed between the elastic area of ​​the first sub-part and the main body, and the tab can smoothly pass through the first accommodation gap and connect with the first wall. At the same time, the elastic area can provide an extension space for the tab on the basis of supporting and bearing the tab, making the structure of the tab more stable.

[0011] In some embodiments, the support portion includes a first sub-portion and a second sub-portion both connected to the main portion, and a second accommodating gap for accommodating the tab is formed between the first sub-portion and the second sub-portion;

[0012] The first sub-part and the second sub-part both have a support area, and at least one of them has an elastic area.

[0013] Through the above structure, the first sub-section and the second sub-section can cooperate with each other to limit the tab in the second accommodation gap, and provide a support basis for the tab, reducing the probability of the redundant part of the tab sagging or warping. In addition, the first sub-section and / or the second sub-section can also provide an extension space for the tab when the electrode assembly expands, reducing the probability of the tab cracking and improving the stability of the tab structure.

[0014] In some embodiments, in a direction from the electrode assembly to the first wall, heights of the first sub-portion and the second sub-portion are equal.

[0015] Through the above structure, the first sub-section and the second sub-section can limit the tab in the second accommodation gap formed by the two, and provide a support basis for the redundant part of the tab, so that the connection between the tab and the first wall is more stable. In addition, the elastic area of ​​the first sub-section and / or the second sub-section can also provide an extension space for the tab, protect the structure of the tab, and reduce the probability of cracking of the tab.

[0016] In some embodiments, in a direction from the electrode assembly to the first wall, heights of the first sub-portion and the second sub-portion are not equal.

[0017] Through the above structure, on the one hand, the first sub-part and the second sub-part can respectively support the redundant part of the tab at different heights to improve the support stability of the tab. On the other hand, the probability of the tab sinking or warping in the first direction can be further reduced.

[0018] In some embodiments, in a direction from the electrode assembly to the first wall, a height of a lower surface of the first sub-portion is higher than a height of an upper surface of the second sub-portion.

[0019] Therefore, when the tab is inserted into the second accommodation gap, the force acting on the tab at the same position of the first sub-portion and the second sub-portion in the first direction can be reduced, so that the structure of the tab is more stable.

[0020] In some embodiments, in a plane intersecting a direction in which the electrode assembly points toward the first wall, a projection of the first sub-portion and a projection of the second sub-portion have an overlapping area.

[0021] Through the above structure, the first sub-section and the second sub-section can provide a supporting basis for the pole lug while enabling the pole lug to bend and extend in the second accommodating gap. On the one hand, it can facilitate the accommodation of the redundant part of the pole lug, and on the other hand, it can enable the redundant part of the pole lug to be better overlapped with the first sub-section and the second sub-section.

[0022] In some embodiments, an end of the elastic region of the first sub-portion and / or the second sub-portion away from the corresponding support region has a curved surface.

[0023] Through the above structure, when the tab overlaps the elastic area of ​​the first sub-section and the second sub-section, the arc surface structure can better contact the tab smoothly, which is beneficial to the stretching of the tab and reduces the probability of tab damage.

[0024] In some embodiments, in a direction intersecting the direction of the electrode assembly pointing toward the first wall, the width of the elastic zone is 1 / 10-1 / 3 of the width of the corresponding first sub-portion, and / or the width of the elastic zone is 1 / 10-1 / 3 of the width of the corresponding second sub-portion.

[0025] Therefore, the elastic area can not only provide stable support for the pole ear, but also provide sufficient expansion space for the pole ear when the electrode assembly expands, thereby improving the stability of the pole ear.

[0026] In some embodiments, the elastic modulus of the elastic region is greater than the elastic modulus of the support region. Thus, the elastic region and the support region cooperate with each other to smoothly support the tab and provide expansion space for the tab through the elastic potential energy of the elastic region.

[0027] In some embodiments, the housing includes a shell and a top cover, the shell has an opening, and the electrode assembly is disposed inside the shell, and the top cover is sealed and disposed at the opening;

[0028] Among them, the top cover is provided with an electrode terminal, and the electrode tab is electrically connected to the electrode terminal.

[0029] Through the above structure, electrical connection between the pole ear and the electrode terminal on the top cover is achieved. At the same time, the support member can be connected and fixed to the top cover so that the support member is arranged between the electrode assembly and the top cover to support the pole ear.

[0030] In some embodiments, the support member further includes a main body, and the support area is connected to the outer shell through the main body; the outer shell further includes an insulating member connected to the top cover, and the main body is connected to the outer shell through the insulating member.

[0031] The main body of the support member is fixed to the shell through the insulating member, so that the support area and the elastic area can be stably arranged between the first wall and the electrode assembly, thereby providing a stable supporting force for the electrode tab.

[0032] In some embodiments, the support member is an insulating support member, so that the tab can be stably supported on the support member, reducing the probability of short circuit inside the battery cell.

[0033] In a second aspect, the present application also provides a battery, comprising the battery cell as described above.

[0034] In a third aspect, the present application also provides an electrical device, comprising the battery as described above.

[0035] In the above-mentioned battery cell, battery and electrical device, the support member is fixedly connected to the shell through the main body so that the support member can be stably arranged inside the shell. At the same time, the support portion is located between the first wall and the electrode assembly, and has an elastic area and a support area, wherein the elastic area is connected to the main body through the support area. When the pole ear is connected to the first wall of the shell, the elastic area can not only support the pole ear to reduce the probability of the pole ear sagging or warping due to excessive length, but also can provide expansion space for the pole ear through its own elastic potential energy when the electrode assembly expands, thereby reducing the probability of cracking due to pulling at the root of the pole ear, thereby improving the overall stability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments.

[0037] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments.

[0038] Figure 3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments.

[0039] Figure 4 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0040] Figure 5 is a partial cross-sectional view of a battery cell according to one or more embodiments.

[0041] Figure 6 FIG. 4 is a schematic diagram of the structure of a support member in a battery cell according to one or more embodiments.

[0042] Figure 7 is a partial cross-sectional view of a battery cell according to one or more embodiments.

[0043] Figure 8 is a partial cross-sectional view of a battery cell according to one or more embodiments.

[0044] Fig. 9 is a partial cross-sectional view of a battery cell according to one or more embodiments.

[0045] Explanation of the accompanying drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, casing; 20, battery cell; 11, first part; 12, second part; 21, top cover; 22, shell; 23, electrode assembly; 24, outer shell; 25, support member; 26, pole ear; 27, main body; 28, support part; 281, elastic area; 282, support area; 283, first sub-section; 284, first accommodating gap; 285, second sub-section; 286, second accommodating gap; 287, arc surface; a, first direction; b, second direction. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0052] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] A battery cell is the smallest unit that makes up a battery. Multiple battery cells can be directly assembled to form a battery, or they can be first assembled to form a battery module, and then one or more battery modules are assembled to form a battery. In the process of assembling battery cells to form a battery, the battery cells need to be placed in a box to form a complete structure.

[0054] For the structure of each battery cell, the electrode assembly is the part where the electrochemical reaction actually occurs in the battery cell. The electrode assembly is mainly formed by stacking or winding the positive electrode sheet, the separator and the negative electrode sheet in sequence, wherein the parts with active materials on the positive electrode sheet and the negative electrode sheet constitute the main body of the electrode assembly, and the parts without active materials on the positive electrode sheet and the negative electrode sheet each constitute the pole ear. The positive pole ear and the negative pole ear can be located together at one end of the main body or at both ends of the main body respectively. During the assembly process of the battery cell, the pole ear is connected to the electrode terminal to form a current loop, thereby realizing the charging and discharging process of the battery.

[0055] In order to make the tabs better connected to the electrode terminals, the length of the tabs needs to be set. If the tabs are too short, they cannot be stably connected to the electrode terminals. In addition, during the cycle of the battery cells, the electrode assembly expands due to electrochemical reactions, which can easily pull the tabs connected to the electrode assembly, causing cracks at the base of the tabs.

[0056] Based on this, in current battery cells, the length of the tabs is usually appropriately increased to make the tabs redundant and provide expansion space for the electrode assembly. However, when the tabs are redundant, the tabs will bend inside the battery cell, which may cause problems such as sagging or warping. At this time, the tabs are likely to collide with other components inside the battery cell, or be inserted into the electrode assembly backwards, damaging the structure of the electrode assembly.

[0057] Based on the above considerations, in order to solve the problem that the redundant design of the pole ear is prone to collapse or warping, thereby affecting the performance of the battery cell, a battery cell is provided in one or more embodiments of the present application. First, the support member is fixedly connected to the shell through the main body so that the support member can be stably arranged inside the shell. At the same time, the support portion is located between the first wall and the electrode assembly, and has an elastic area and a support area. Among them, the elastic area is connected to the main body through the support area. When the pole ear is connected to the first wall of the shell, the elastic area can not only support the pole ear to reduce the probability of collapse or warping of the pole ear due to excessive length, but also can provide extension space for the pole ear through its own elastic potential energy when the electrode assembly expands, reducing the probability of cracking due to pulling at the root of the pole ear, thereby improving the overall stability of the battery cell.

[0058] The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircraft.

[0059] The embodiment of the present application provides an electric device using a battery as a power source, and the electric 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 car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0061] Please refer to Figure 1 The vehicle 1000 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 an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0062] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Please refer to Figure 2 The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0064] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0065] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0066] Please refer to Figure 3 The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a top cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0067] The top cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the top cover 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 21 is not easy to deform when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the top cover 21. The electrode terminal can be used to electrically connect with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, the top cover 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the top cover 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the top cover 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the top cover 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0068] The shell 22 is a component used to cooperate with the top cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the top cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the top cover 21 at the opening. Without limitation, the top cover 21 and the shell 22 can also be integrated. Specifically, the top cover 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the top cover 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0069] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a lug. The positive and negative electrode lugs may be located together at one end of the main body or at both ends of the main body, respectively. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the lugs connect the electrode terminals to form a current loop.

[0070] See also Figure 4 , Figure 5 as well as Figure 6 An embodiment of the present application provides a battery cell 20, including a housing 24, an electrode assembly 23, and a support member 25. The housing 24 has a first wall, the electrode assembly 23 is disposed inside the housing 24, and the electrode assembly 23 has a tab 26 connected to the first wall. The support member 25 includes a support portion 28 for supporting the tab 26, the support portion 28 is disposed between the first wall and the electrode assembly 23, and has an elastic region 281 and a support region 282, the elastic region 281 surrounds at least a portion of the tab 26, and the support region 282 is connected between the elastic region 281 and the housing 24.

[0071] It should be noted that the shell 24 refers to the shell 22 structure with a hollow interior, and a receiving cavity is formed inside for receiving the electrode assembly 23 and other structures in the battery cell 20, so as to protect the electrode assembly 23. The first wall refers to one of the side walls of the shell 24. When the electrode assembly 23 is arranged inside the shell 24, the electrode ear 26 of the electrode assembly 23 is arranged toward the first wall, so as to connect the electrode ear 26 to the first wall.

[0072] The support area 282 is connected between the elastic area 281 and the outer shell 24 , wherein the connection between the support area 282 and the outer shell 24 may be an indirect connection or a direct connection.

[0073] Furthermore, the support member 25 refers to a component that is disposed inside the housing 24 and can support and carry the tab 26. The support member 25 includes a support portion 28, and the support portion 28 is used to support the tab 26. When the support portion 28 is fixed to the inside of the housing 24, the support portion 28 is located between the first wall and the electrode assembly 23.

[0074] One end of the pole ear 26 is located on the electrode assembly 23, and the other end is connected to the first wall. At the same time, since the support portion 28 is located between the first wall and the electrode assembly 23, when the pole ear 26 extends toward the first wall, the pole ear 26 can overlap the support portion 28. Therefore, the support portion 28 supports the pole ear 26, so that the redundant length of the pole ear 26 can overlap or be carried on the support portion 28, thereby reducing the probability of the pole ear 26 sinking or warping.

[0075] In addition, the support portion 28 has an elastic region 281 and a support region 282, the support region 282 is connected between the elastic region 281 and the housing 24, and the elastic region 281 is connected to one end of the support region 282 close to the pole ear 26, so that the elastic region 281 surrounds at least part of the circumference of the pole ear 26. Thus, the support region 282 can provide support strength for the entire support portion 28, so that the support portion 28 is smoothly disposed between the first wall and the electrode assembly 23. Further, the elastic region 281 can contact the pole ear 26, that is, to achieve support for the pole ear 26. At this time, the redundant length of the pole ear 26 can be overlapped or carried on the elastic region 281.

[0076] In the initial state, the redundant part of the tab 26 overlaps the elastic area 281, providing a support basis for the tab 26. During the cycle of the battery cell 20, when the electrode assembly 23 expands, the tab 26 is pulled by the electrode assembly 23. At this time, the elastic area 281 can provide an extension space for the expansion and contraction of the tab 26 through its own elastic potential energy, so as to reduce the probability of cracking caused by the pulling of the base of the tab 26.

[0077] Through the above structure, not only can the redundant part of the pole lug 26 be supported, reducing the probability of the pole lug 26 sagging or warping due to its excessive length, but also when the electrode assembly 23 expands, the elastic potential energy of the elastic zone 281 can be used to provide an expansion space for the pole lug 26, thereby reducing the probability of the root of the pole lug 26 being pulled and cracked, thereby improving the overall stability of the battery cell 20.

[0078] In some embodiments, the support member 25 also includes a main body 27, the support area 282 is connected to the outer shell 24 through the main body 27, the support portion 28 includes a first sub-portion 283, the first sub-portion 283 has an elastic area 281 and a support area 282, and the elastic area 281 of the first sub-portion 283 and the main body 27 are spaced apart to form a first accommodating gap 284 for accommodating the pole ear 26.

[0079] Specifically, the first sub-portion 283 is fixed to the main body 27 . When the main body 27 is connected to the housing 24 , the first sub-portion 283 is installed inside the housing 24 under the action of the main body 27 and is located between the first wall and the electrode assembly 23 .

[0080] The first sub-portion 283 has an elastic region 281 and a support region 282, wherein the support region 282 is connected to the main body 27, and the elastic region 281 is connected to one end of the support region 282 close to the tab 26. One end of the elastic region 281 away from the support region 282 is set as a suspended end, and a first accommodating gap 284 for accommodating the tab 26 is formed between the suspended end and the main body 27.

[0081] When the tab 26 passes through the first accommodation gap 284 and is connected to the first wall, the redundant portion of the tab 26 overlaps the suspended end of the elastic region 281, thereby reducing the probability of the redundant portion of the tab 26 sagging or warping. When the electrode assembly 23 expands, the tab 26 moves under the pulling action of the electrode assembly 23, and at this time, the elastic region 281 can provide an extension space for the tab 26.

[0082] Thus, through the above structure, a first accommodation gap 284 is formed between the elastic area 281 of the first sub-part 283 and the main body 27, and the tab 26 can smoothly pass through the first accommodation gap 284 and connect with the first wall. At the same time, the elastic area 281 can provide an extension space for the tab 26 on the basis of supporting and bearing the tab 26, so that the structure of the tab 26 is more stable.

[0083] Please also see Figure 7 and Figure 8In some embodiments, the support portion 28 includes a first sub-portion 283 and a second sub-portion 285 both connected to the main body portion 27, and a second accommodating gap 286 for accommodating the tab 26 is formed between the first sub-portion 283 and the second sub-portion 285. The first sub-portion 283 and the second sub-portion 285 both have a support area 282, and at least one of them has an elastic area 281.

[0084] Specifically, the support portion 28 may include a first sub-portion 283 and a second sub-portion 285 . Both the first sub-portion 283 and the second sub-portion 285 are connected to the main body 27 and are spaced apart from each other to form a second accommodating gap 286 for accommodating the tab 26 .

[0085] It can be understood that in order to facilitate the connection with the outer shell 24 and facilitate the installation and fixation of the first sub-section 283 and the second sub-section 285, the main body 27 can be set as a frame structure with an opening at the center position. The outline of the frame structure can be set to cooperate with the shape of the first wall so that the frame structure can be better connected to the first wall.

[0086] For example, a slot can be provided on the frame structure, and a protrusion that is snap-fitted with the slot can be provided on the first wall, so that the main body 27 can be snap-fitted and fixed to the first wall. Of course, the frame structure and the first wall can also be connected and fixed by other structures, such as bolt connection or other detachable connection structures, which will not be described in detail here.

[0087] The first sub-section 283 and the second sub-section 285 are both arranged at the opening of the frame structure, and the first sub-section 283 and the second sub-section 285 respectively have a connection end and a suspended end, wherein the connection end is connected to the frame structure, and the suspended end is suspended, and the suspended end of the first sub-section 283 and the suspended end of the second sub-section 285 are opposite and spaced apart, and a second accommodating gap 286 is formed between the two. The tab 26 can pass through the second accommodating gap 286 and be connected to the first wall.

[0088] like Figure 7 As shown, further, both the first sub-section 283 and the second sub-section 285 have a support area 282, and one of them has an elastic area 281. That is, the first sub-section 283 has a support area 282 and an elastic area 281 connected to each other, and the second sub-section 285 has only a support area 282. Alternatively, the second sub-section 285 has a support area 282 and an elastic area 281 connected to each other, and the first sub-section 283 has only a support area 282.

[0089] Thus, when the tab 26 is inserted into the second accommodation gap 286, the first sub-portion 283 and the second sub-portion 285 can jointly provide a support base for the tab 26, so that the connection between the tab 26 and the first wall is more stable, and the redundant part of the tab 26 is reduced. In addition, when the electrode assembly 23 occurs, the elastic area 281 of the first sub-portion 283 or the second sub-portion 285 can provide an extension space for the tab 26, so that the tab 26 can be smoothly extended or moved.

[0090] like Figure 8 As shown, in some other embodiments, the first sub-portion 283 and the second sub-portion 285 may also both have a support area 282 and an elastic area 281, and the elastic area 281 of the first sub-portion 283 and the elastic area 281 of the second sub-portion 285 are opposite to and spaced apart from each other, so that a second accommodating gap 286 is formed between the two elastic areas 281.

[0091] Therefore, the two elastic regions 281 jointly provide a support basis for the pole lug 26 and can provide an expansion space for the pole lug 26 , so that the connection between the pole lug 26 and the first wall is more stable.

[0092] Through the above structure, the first sub-portion 283 and the second sub-portion 285 can cooperate with each other to limit the pole tab 26 in the second accommodation gap 286, and provide a support basis for the pole tab 26, thereby reducing the probability of the redundant part of the pole tab 26 sinking or warping. In addition, the first sub-portion 283 and / or the second sub-portion 285 can also provide an extension space for the pole tab 26 when the electrode assembly 23 expands, thereby reducing the probability of cracking of the pole tab 26 and improving the stability of the structure of the pole tab 26.

[0093] In some embodiments, in the direction from the electrode assembly 23 to the first wall, the first sub-portion 283 and the second sub-portion 285 have the same height.

[0094] Specifically, in the direction from the electrode assembly 23 to the first wall (first direction a), the first sub-portion 283 and the second sub-portion 285 are set to the same height, and in the second direction b perpendicular to the first direction a, a second accommodating gap 286 is formed between the first sub-portion 283 and the second sub-portion 285.

[0095] Thus, the pole lug 26 is inserted into the second accommodating gap 286, and the pole lug 26 contacts the elastic area 281 of the first sub-portion 283 or the second sub-portion 285. The first sub-portion 283 and the second sub-portion 285 located on both sides of the pole lug 26 along the second direction b can support the pole lug 26, and make the redundant part of the pole lug 26 overlap the first sub-portion 283 and / or the second sub-portion 285.

[0096] When the electrode assembly 23 expands and pulls the tab 26 , the elastic area 281 in contact with the tab 26 can provide expansion space for the tab 26 , thereby protecting the structure of the tab 26 and reducing the probability of cracking of the tab 26 .

[0097] Through the above structure, the first sub-portion 283 and the second sub-portion 285 can limit the pole lug 26 in the second accommodation gap 286 formed by the two, and provide a support basis for the redundant part of the pole lug 26, so that the connection between the pole lug 26 and the first wall is more stable. In addition, the elastic area 281 of the first sub-portion 283 and / or the second sub-portion 285 can also provide an extension space for the pole lug 26, protect the structure of the pole lug 26, and reduce the probability of cracking of the pole lug 26.

[0098] In some embodiments, in the direction from the electrode assembly 23 to the first wall, the heights of the first sub-portion 283 and the second sub-portion 285 are not equal.

[0099] Specifically, in the first direction a, the first sub-portion 283 and the second sub-portion 285 are set at different heights. When the tab 26 passes through the second accommodation gap 286 between the first sub-portion 283 and the second sub-portion 285, the first sub-portion 283 and the second sub-portion 285 can provide support bases for different positions of the tab 26 at different heights, that is, the redundant parts of the tab 26 can be overlapped on the first sub-portion 283 and the second sub-portion 285, respectively, so that the redundant parts of the tab 26 are more stably supported.

[0100] In addition, since the first sub-portion 283 and the second sub-portion 285 have different heights, the tab 26 bends and extends in the first direction a when inserted into the second receiving gap 286 , thereby further reducing the probability of the tab 26 sinking or warping in the first direction a.

[0101] Through the above structure, on one hand, the first sub-portion 283 and the second sub-portion 285 can respectively support the redundant part of the tab 26 at different height positions to improve the support stability of the tab 26. On the other hand, the probability of the tab 26 sinking or warping in the first direction a can be further reduced.

[0102] In some embodiments, in the direction from the electrode assembly 23 to the first wall, the height of the lower surface of the first sub-portion 283 is higher than the height of the upper surface of the second sub-portion 285 .

[0103] Specifically, in the first direction a, the height of the lower surface of the first sub-portion 283 is higher than the height of the upper surface of the second sub-portion 285, that is, a gap is formed between the first sub-portion 283 and the second sub-portion 285 in the first direction a. Therefore, when the tab 26 is inserted into the second accommodation gap 286, the force acting on the tab 26 at the same position of the first sub-portion 283 and the second sub-portion 285 in the first direction a can be reduced, so that the structure of the tab 26 is more stable.

[0104] In some embodiments, in a plane intersecting the direction in which the electrode assembly 23 points toward the first wall, a projection of the first sub-portion 283 and a projection of the second sub-portion 285 have an overlapping area.

[0105] Specifically, in a plane perpendicular to the first direction a, the projection of the first sub-portion 283 and the projection of the second sub-portion 285 have an overlapping area. Therefore, when the tab 26 passes through the second accommodating gap 286 and connects to the first wall, the tab 26 first bypasses the elastic area 281 of the first sub-portion 283, and then bypasses the elastic area 281 of the second sub-portion 285 in the opposite direction, so that the tab 26 can be bent and extended in the second accommodating gap 286. On the one hand, it is convenient to accommodate the redundant part of the tab 26, and on the other hand, it can make the redundant part of the tab 26 better overlapped on the first sub-portion 283 and the second sub-portion 285.

[0106] Through the above structure, the first sub-section 283 and the second sub-section 285 can provide a supporting basis for the pole lug 26 while enabling the pole lug 26 to bend and extend in the second accommodating gap 286. On the one hand, it can facilitate the accommodation of the redundant part of the pole lug 26. On the other hand, it can enable the redundant part of the pole lug 26 to be better overlapped on the first sub-section 283 and the second sub-section 285.

[0107] like Fig. 9 As shown, in some embodiments, the elastic region 281 of the first sub-portion 283 and / or the second sub-portion 285 has an arc surface 287 at one end away from the corresponding support region 282 , and the arc surface 287 is disposed toward the tab 26 .

[0108] Specifically, the elastic regions 281 of the first sub-portion 283 and the second sub-portion 285 have a connecting end and a suspended end, wherein the connecting end is connected to the respective supporting regions 282 , and the suspended end is suspended and used for overlapping with the tab 26 .

[0109] The arc surface 287 is arranged at the suspended end of the elastic region 281, and the arc surface 287 is arranged toward the pole lug 26. Therefore, when the pole lug 26 is overlapped with the suspended end of the elastic region 281, the structure of the arc surface 287 can better contact the pole lug 26 smoothly, which is conducive to the stretching of the pole lug 26 and reduces the probability of damage to the pole lug 26.

[0110] Through the above structure, when the tab 26 overlaps the elastic area 281 of the first sub-portion 283 and the second sub-portion 285, the structure of the arc surface 287 can better contact the tab 26 smoothly, which is beneficial to the stretching of the tab 26 and reduces the probability of damage to the tab 26.

[0111] Please also see Figure 5 and Figure 8 In some embodiments, in a direction intersecting with the direction of the electrode assembly 23 pointing toward the first wall, a width L1 of the elastic zone 281 is 1 / 10-1 / 3 of a width L2 of a corresponding first sub-portion 283 , and / or a width L1 of the elastic zone 281 is 1 / 10-1 / 3 of a width L3 of a corresponding second sub-portion 285 .

[0112] Specifically, in the second direction b perpendicular to the first direction a, the width of the elastic zone 281 on the first sub-portion 283 is 1 / 10-1 / 3 of the width of the first sub-portion 283 , and the width of the elastic zone 281 on the second sub-portion 285 is 1 / 10-1 / 3 of the width of the second sub-portion 285 .

[0113] Therefore, the elastic region 281 can not only provide stable support for the pole tab 26 , but also provide sufficient expansion space for the pole tab 26 when the electrode assembly 23 expands, thereby improving the stability of the pole tab 26 .

[0114] In some embodiments, the elastic modulus of the elastic region 281 is greater than the elastic modulus of the support region 282 .

[0115] Specifically, different materials with different elastic moduli may be used between the elastic region 281 and the support region 282. For example, the elastic region 281 may be, but not limited to, made of rubber, silicone, and the support region 282 may be, but not limited to, made of plastic. Of course, the elastic region 281 and the support region 282 may also be made of the same material and processed in different ways, such as at different temperatures, to form different elastic moduli.

[0116] The elastic modulus of the elastic region 281 is greater than the elastic modulus of the support region 282, that is, the elastic potential energy of the elastic region 281 is greater than the elastic potential energy of the support region 282. Therefore, when the elastic region 281 overlaps the tab 26, it can not only provide support for the tab 26, but also provide an extension space for the tab 26 through its own elastic potential energy, so that the tab 26 can be smoothly extended or moved.

[0117] Therefore, the elastic area 281 and the supporting area 282 cooperate with each other to smoothly support the tab 26 , and can provide an expansion space for the tab 26 through the elastic potential energy of the elastic area 281 .

[0118] In some embodiments, the housing 24 includes a shell 22 and a top cover 21, wherein the shell 22 has an opening, and the electrode assembly 23 is disposed inside the shell 22, and the top cover 21 is sealed at the opening. The top cover 21 is provided with an electrode terminal, and the tab 26 is electrically connected to the electrode terminal.

[0119] Specifically, the shell 22 is hollow inside and has an opening. The electrode assembly 23 is placed inside the shell 22 through the opening, and the tab 26 is arranged toward the opening. The top cover 21 is sealed at the opening of the shell 22, and together with the shell 22, forms a sealed cavity, and the electrode assembly 23 is accommodated in the sealed cavity.

[0120] The top cover 21 is the first wall of the outer shell 24 . The top cover 21 is provided with electrode terminals. The tabs 26 are electrically connected to the electrode terminals, so that the input and output of electric energy of the battery cell 20 are realized through the electrode terminals.

[0121] Further, the main body 27 of the support member 25 is detachably connected to the top cover 21. For example, a groove may be provided on the main body 27, and a protrusion that engages with the groove may be provided on the top cover 21, so as to realize a detachable connection between the main body 27 and the top cover 21. Thus, the support part 28 may be provided between the electrode assembly 23 and the top cover 21 through the main body 27, so as to support the pole lug 26 through the support part 28.

[0122] Through the above structure, the electrical connection between the pole ear 26 and the electrode terminal on the top cover 21 is achieved. At the same time, the support member 25 can be connected and fixed to the top cover 21, so that the support member 25 is arranged between the electrode assembly 23 and the top cover 21 to support the pole ear 26.

[0123] In some embodiments, the housing 24 further includes an insulating member (not shown in the figure) connected to the top cover 21 , and the main body 27 is connected to the housing 24 through the insulating member.

[0124] Specifically, the insulating member can be configured as a lower plastic, and the lower plastic is disposed between the top cover 21 and the electrode assembly 23 to perform insulation and isolation functions.

[0125] First, the insulating member is fixed to the side surface of the top cover 21 facing the inside of the housing 22, that is, the insulating member is fixed to the lower surface of the top cover 21. Further, the main body 27 is connected to the insulating member, so that the support part 28 can be fixed to the insulating member through the main body 27, and then fixed to the top cover 21.

[0126] The connection between the main body 27 and the insulating member may be in a detachable connection manner, such as a snap connection.

[0127] Thus, the main body 27 of the support member 25 is fixed to the housing 24 through the insulating member, so that the support area 282 and the elastic area 281 can be stably disposed between the first wall and the electrode assembly 23 , thereby providing a stable supporting force for the tab 26 .

[0128] In some embodiments, the support member 25 is an insulating support member, that is, the support member 25 is made of insulating material, so that the tab 26 can be stably supported on the support member 25, reducing the probability of short circuit inside the battery cell 20.

[0129] Based on the same concept as the above-mentioned battery cell 20 , the present application also provides a battery 100 , including the above-mentioned battery cell 20 .

[0130] Based on the same concept as the above-mentioned battery 100 , the present application also provides an electrical device, including the above-mentioned battery 100 .

[0131] According to one or more embodiments, the electrode assembly 23 is first placed in the shell 22, and the tab 26 of the electrode assembly 23 is arranged toward the opening of the shell 22. The main body 27 of the support member 25 is fixedly connected to the top cover 21, and the tab 26 passes through the support member 25 and is electrically connected to the electrode terminal on the top cover 21, and then the top cover 21 is sealed and arranged at the opening. At this time, the support member 25 is located inside the shell 22 and between the electrode assembly 23 and the top cover 21.

[0132] In the initial state, the redundant part of the tab 26 overlaps and supports the first sub-portion 283 and / or the second sub-portion 285, which can reduce the probability of the tab 26 sagging or warping, making the structure of the tab 26 more stable.

[0133] When the electrode assembly 23 expands, the electrode assembly 23 pulls the tab 26. At this time, the elastic area 281 on the first sub-portion 283 or the second sub-portion 285 contacts the tab 26 and provides an extension space for the tab 26 through its own elastic potential energy, so that the tab 26 can be smoothly expanded or moved, reducing the probability of cracking of the tab 26. In this way, the performance of the battery cell 20 can be improved.

[0134] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; An electrode assembly, disposed inside the housing, the electrode assembly having a tab connected to the first wall; and The support member includes a support portion for supporting the pole ear, the support portion is arranged between the first wall and the electrode assembly, and has an elastic area and a support area, the elastic area surrounds at least part of the pole ear, and the support area is connected between the elastic area and the shell.

2. The battery cell according to claim 1, characterized in that: The support member also includes a main body, the support area is connected to the shell through the main body, the support part includes a first sub-part, the first sub-part has the elastic area and the support area, and the elastic area of ​​the first sub-part and the main body are spaced apart to form a first accommodating gap for accommodating the tab.

3. The battery cell according to claim 2, characterized in that: The support portion includes a first sub-portion and a second sub-portion both connected to the main body portion, and a second accommodating gap for accommodating the tab is formed between the first sub-portion and the second sub-portion; The first sub-section and the second sub-section both have the supporting area, and at least one of them has the elastic area.

4. The battery cell according to claim 3, characterized in that: In a direction from the electrode assembly to the first wall, the first sub-portion and the second sub-portion have the same height.

5. The battery cell according to claim 3, characterized in that: In a direction from the electrode assembly to the first wall, heights of the first sub-portion and the second sub-portion are unequal.

6. The battery cell according to claim 5, characterized in that: In a direction from the electrode assembly to the first wall, a height of a lower surface of the first sub-portion is higher than a height of an upper surface of the second sub-portion.

7. The battery cell according to claim 6, characterized in that: In a plane intersecting a direction in which the electrode assembly points toward the first wall, a projection of the first sub-portion and a projection of the second sub-portion have an overlapping area.

8. The battery cell according to claim 3, characterized in that: One end of the elastic area of ​​the first sub-portion and / or the second sub-portion away from the corresponding supporting area has a curved surface.

9. The battery cell according to claim 3, characterized in that: In a direction intersecting with a direction of the electrode assembly pointing toward the first wall, a width of the elastic zone is 1 / 10-1 / 3 of a width of the corresponding first sub-portion, and / or a width of the elastic zone is 1 / 10-1 / 3 of a width of the corresponding second sub-portion.

10. The battery cell according to claim 1, characterized in that: The elastic modulus of the elastic zone is greater than the elastic modulus of the supporting zone.

11. The battery cell according to claim 1, characterized in that: The housing comprises a shell and a top cover, the shell has an opening, the electrode assembly is arranged inside the shell, and the top cover is sealed and arranged at the opening; Wherein, the top cover is provided with an electrode terminal, and the electrode tab is electrically connected to the electrode terminal.

12. The battery cell according to claim 11, characterized in that: The support member further comprises a main body, and the support area is connected to the shell through the main body; the shell further comprises an insulating member connected to the top cover, and the main body is connected to the shell through the insulating member.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The support member is an insulating support member.

14. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: Comprising the battery of claim 14.

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