Battery cell, battery, energy storage device and electric device

Abstract

The present application discloses a battery cell, a battery, an energy storage device and an electric device. The battery cell comprises a housing, a first electrically conductive member, a first terminal post, and a first deformable member, wherein the housing has a first wall; the first electrically conductive member is disposed on an outer side of the first wall and is insulated from the first wall; the first electrically conductive member comprises a first sub-component and a second sub-component connected to each other, the second sub-component being used for connection with a busbar component; the first terminal post is connected to the second sub-component; and the first deformable member is electrically connected to the first wall, the first deformable member being configured to deform to come into contact with the first sub-component, thereby electrically connecting the first terminal post to the first wall. The technical solution provided in the present application can improve the reliability of the battery.

Description

Battery cell, battery, energy storage device and electric device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202421174327.6, filed on May 27, 2024, entitled “Battery cell, battery, energy storage device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular, to a battery cell, a battery, an energy storage device and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the development of battery technology, how to improve the reliability of the battery is a technical problem that needs to be solved in battery technology. SUMMARY

[0005] The present application provides a battery cell, a battery, an energy storage device and an electric device. The technical scheme provided by the present application can improve the reliability of the battery.

[0006] In a first aspect, the present application provides a battery cell. The battery cell comprises a housing, a first conductive member, a first pole and a first deformation member. The housing has a first wall. The first conductive member is disposed outside the first wall and insulated from the first wall, and the first conductive member comprises a first sub-component and a second sub-component connected to each other, and the second sub-component is configured to be connected to a busbar. The first pole is connected to the second sub-component. The first deformation member is electrically connected to the first wall, and the first deformation member is configured to be deformed to contact the first sub-component to electrically connect the first pole and the first wall.

[0007] The first deformation member is electrically connected to the first conductive member, which can cause internal short circuit of the battery cell, thereby realizing overcharge protection function. In the above scheme, by setting the first sub-component in contact with the deformed first deformation member, the resistance value of the internal current loop of the battery cell can be increased, so that the current of the internal current loop of the battery cell is reduced, thereby reducing the risk of melting of the contact part between the first deformation member or the first deformation member and the first conductive member due to excessive current, so that the first deformation member effectively plays a role in overcharge protection, thereby effectively improving the reliability of the battery cell under misuse conditions such as overcharge, and further improving the reliability of the battery.

[0008] According to some embodiments of the present application, the first sub-component has a greater resistivity than the second sub-component.

[0009] In the above scheme, by setting the resistivity of the first sub-component to be greater than the resistivity of the second sub-component, on the one hand, the internal current loop of the battery cell can be effectively increased when the first deformation member contacts the first conductive member, thereby reducing the risk of structural damage due to melting of the first deformation member or the contact portion between the first deformation member and the first conductive member caused by a large current, leading to failure of the overcharge protection. On the other hand, by setting the first sub-component with a greater resistivity, the space occupied by the first sub-component can be reduced, thereby improving the space utilization of the first conductive member, and further improving the volumetric energy density of the battery cell and the battery.

[0010] According to some embodiments of the present application, the first sub-component is made of stainless steel, and the second sub-component is made of aluminum.

[0011] In the above scheme, by setting the material of the first sub-component to be stainless steel and the material of the second sub-component to be aluminum, on the one hand, the internal current loop of the battery cell passes through the first deformation member, thereby reducing the current and reducing the risk of melting of the first deformation member before the electrical connection member inside the battery cell, leading to failure of the overcharge protection. On the other hand, since the resistivity of stainless steel is greater than that of aluminum, the space occupied by the first sub-component can be effectively reduced, thereby improving the volumetric energy density of the battery cell and the battery.

[0012] According to some embodiments of the present application, the first sub-component has a resistance of not less than 0.3 milliohm and not greater than 3 milliohm.

[0013] In the above scheme, by setting the resistance of the first sub-component to be not less than 0.3 milliohm, when the first deformation member deforms and contacts the first sub-component, the current value of the internal current loop of the battery cell can be effectively reduced, thereby reducing the risk of melting of the first deformation member or the contact portion between the first deformation member and the first sub-component caused by a large current, leading to failure of the overcharge protection. By setting the resistance of the first sub-component to be not greater than 3 milliohm, when the first deformation member deforms and contacts the first sub-component, the current value of the internal current loop of the battery cell can be appropriately sized to melt the electrical connection member inside the battery cell, thereby cutting off the charging and discharging circuit of the battery cell to achieve overcharge protection. Therefore, by setting the resistance of the first sub-component to be not less than 0.3 milliohm and not greater than 3 milliohm, the reliability of the overcharge protection of the battery cell can be ensured to some extent, thereby effectively improving the reliability of the battery.

[0014] According to some embodiments of the present application, the second sub-component has a first groove formed on the side facing the first wall, and at least part of the first sub-component is arranged in the first groove.

[0015] In the above scheme, by arranging the first groove on one side of the second sub-component, on one hand, the first sub-component and the second sub-component can be connected to each other, so as to improve the reliability of the battery monomer overcharge protection; on the other hand, the first sub-component and the second sub-component can reduce the space occupation, so that the first conductive piece structure is compact, which is beneficial to the improvement of the battery monomer and the battery volume energy density.

[0016] According to some embodiments of the present application, the inner circumferential surface of the first groove is formed with a first protrusion, and along the thickness direction of the first wall, a part of the first sub-component is located on the side of the first protrusion away from the first wall.

[0017] In the above scheme, by arranging the first protrusion on the inner circumferential surface of the first groove, the first protrusion can be in contact with the first sub-component, so as to limit a part of the first sub-component in the first groove, reduce the risk of the first sub-component and the second sub-component being separated from each other, so as to cause the battery monomer overcharge protection to fail, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery.

[0018] According to some embodiments of the present application, the first protrusion is an annular structure extending in the circumferential direction of the first groove.

[0019] In the above scheme, by arranging the first protrusion as an annular structure, the first sub-component can be effectively contacted in the circumferential direction of the first groove, so as to effectively improve the structural stability between the first sub-component and the second sub-component, reduce the risk of the first sub-component and the second sub-component being separated from each other, so as to cause the battery monomer overcharge protection to fail, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery.

[0020] According to some embodiments of the present application, the outer circumferential surface of the first sub-component is formed with a first flange, and along the thickness direction of the first wall, the first flange is located on the side of the first protrusion away from the first wall.

[0021] In the above scheme, by arranging the first flange to abut against the first protrusion, the first sub-component can be stably arranged in the first groove, so as to improve the structural stability between the first sub-component and the second sub-component, reduce the risk of the first sub-component and the second sub-component being separated from each other, so as to cause the battery monomer overcharge protection to fail, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery.

[0022] According to some embodiments of the present application, the first flange is an annular structure extending in the circumferential direction of the first groove.

[0023] According to the above scheme, by arranging the first flange in a ring structure, the first flange can effectively contact the first protruding part in the circumferential direction of the first groove, thereby effectively improving the structural stability between the first sub-component and the second sub-component, reducing the risk of the first sub-component and the second sub-component being separated from each other and causing the battery cell overcharge protection to fail, thereby improving the reliability of the battery cell, and further improving the reliability of the battery.

[0024] According to some embodiments of the present application, the first sub-component protrudes from the side of the second sub-component facing the first wall in a direction pointing to the inside of the battery cell.

[0025] According to the above scheme, by arranging the first sub-component to protrude from the side of the second sub-component facing the first wall, the first sub-component can be in contact with the first deformation part, thereby improving the reliability of the battery cell overcharge protection, and further improving the reliability of the battery.

[0026] According to some embodiments of the present application, the side of the second sub-component facing the first wall is formed with a second groove, the first groove is arranged on the groove bottom surface of the second groove, and the side of the first protruding part facing the first wall is coplanar with the groove bottom surface of the second groove.

[0027] According to the above scheme, the part of the second sub-component facing the first wall and surrounding the first sub-component can be stamped to form the first protruding part and the second groove, thereby effectively improving the structural stability between the first sub-component and the second sub-component, reducing the risk of the first sub-component and the second sub-component being separated from each other and causing the battery cell overcharge protection to fail, thereby improving the reliability of the battery cell, and further improving the reliability of the battery. In some embodiments, by arranging the second groove, the mass of the first conductive part can be reduced, thereby facilitating the improvement of the mass energy density of the battery cell.

[0028] According to some embodiments of the present application, in the thickness direction of the first wall, the maximum dimension of the first sub-component is not less than 0.1 mm and not greater than 5 mm.

[0029] In the above scheme, by setting the maximum dimension of the first sub-component in the thickness direction of the first wall to be not less than 0.1 mm, the resistance value of the first sub-component is appropriate, which can effectively reduce the risk that the first deformation member or the contact part between the first deformation member and the first conductive member is melted due to excessive current, causing the first deformation member to fail to achieve internal short circuit of the battery monomer to melt the internal electrical connection member of the battery monomer, thereby cutting off the charging and discharging circuit of the battery monomer to achieve overcharge protection; by setting the maximum dimension of the first sub-component in the thickness direction of the first wall to be not greater than 5 mm, the space occupied by the first sub-component can be reduced, the space utilization rate of the first conductive member is improved, and the volume energy density of the battery monomer is higher. Therefore, by setting the maximum dimension of the first sub-component in the thickness direction of the first wall to be not less than 0.1 mm and not greater than 5 mm, the reliability of overcharge protection and the volume energy density of the battery monomer can be considered.

[0030] According to some embodiments of the present application, the battery monomer further comprises a second conductive member, a second pole and a second deformation member. The second conductive member is arranged outside the first wall and insulated from the first wall. The second pole is connected with the second conductive member. The second deformation member is electrically connected with the first wall, and is configured to be deformed to contact the second conductive member to electrically connect the second pole with the first wall.

[0031] In the above scheme, by setting the second deformation member, when the internal pressure of the battery monomer reaches a certain degree, the second deformation member is deformed to contact the second conductive member, so that the second pole is electrically connected with the first wall, and the contact between the first deformation member and the first conductive member is matched, so that the internal electrical connection member of the battery monomer is melted due to the large current generated by short circuit, so as to cut off the charging and discharging circuit of the battery monomer, thereby playing a role in overcharge protection and reducing the risk of thermal runaway of the battery monomer, thereby making the battery have higher reliability.

[0032] According to some embodiments of the present application, the second conductive member comprises a third sub-component and a fourth sub-component connected with each other, the third sub-component is used to contact the second deformation member, the fourth sub-component is used to connect with the bus member, and the second pole is connected with the fourth sub-component.

[0033] In the above scheme, by setting the third sub-component to contact the deformed second deformation member, the resistance value of the internal current loop of the battery monomer can be increased, so that the current of the internal current loop of the battery monomer is reduced, thereby reducing the risk that the second deformation member or the contact part between the second deformation member and the second conductive member is melted due to excessive current, causing the second deformation member to fail to achieve internal short circuit of the battery monomer to melt the internal electrical connection member of the battery monomer, thereby cutting off the charging and discharging circuit of the battery monomer to achieve overcharge protection, thereby effectively improving the reliability of the battery monomer under overcharge and other abuse conditions, thereby making the battery have high reliability.

[0034] According to some embodiments of the present application, the resistivity of the third sub-component is greater than the resistivity of the fourth sub-component.

[0035] In the above scheme, by setting the resistivity of the third sub-component to be greater than the resistivity of the fourth sub-component, on the one hand, the internal current loop of the battery monomer can be effectively increased when the second deformation member contacts the second conductive member, reducing the risk of structural damage and failure of overcharge protection due to melting of the contact part between the second deformation member or the second deformation member and the second conductive member caused by a larger current. On the other hand, by setting the third sub-component with a larger resistivity, the space occupied by the third sub-component can be reduced, and the space utilization rate of the second conductive member can be improved, thereby facilitating the improvement of the volume energy density of the battery monomer and the battery.

[0036] According to some embodiments of the present application, the first pole and the second pole are arranged in a first direction, and along the first direction, the first deformation member is located on the side of the first pole away from the second pole, and / or the second deformation member is located on the side of the second pole away from the first pole.

[0037] In the above scheme, by setting the first deformation member on the side of the first pole away from the second pole, and / or the second deformation member on the side of the second pole away from the first pole, the propagation path of the internal current of the battery monomer can be shortened, the internal resistance of the battery monomer can be reduced, and the charge and discharge performance of the battery can be improved.

[0038] In a second aspect, some embodiments of the present application also provide a battery, which comprises the battery monomer provided in the first aspect.

[0039] In a third aspect, some embodiments of the present application also provide an energy storage device, which comprises the battery monomer provided in the first aspect.

[0040] In a fourth aspect, some embodiments of the present application also provide a power consumption device, which comprises the battery monomer provided in the first aspect, and the battery monomer is used to provide electric energy.

[0041] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0043] FIG. 1 is a schematic view of a vehicle in some embodiments of the present application;

[0044] FIG. 2 is a schematic view of an energy storage device in some embodiments of the present application;

[0045] FIG. 3 is a perspective exploded view of a battery in some embodiments of the present application;

[0046] FIG. 4 is a perspective exploded view of a battery cell in some embodiments of the present application;

[0047] FIG. 5 is a perspective exploded view of a partial structure of a battery cell in some embodiments of the present application;

[0048] FIG. 6 is an internal schematic view of a partial structure of a battery cell in some embodiments of the present application;

[0049] FIG. 7 is a schematic view of a first electrode terminal, a first wall, and a first deformation member in some embodiments of the present application;

[0050] FIG. 8 is a schematic view of a first conductive member in some embodiments of the present application;

[0051] FIG. 9 is a schematic view of a flip tab in some embodiments of the present application;

[0052] FIG. 10 is a perspective exploded view of a first subcomponent and a second subcomponent in some embodiments of the present application;

[0053] FIG. 11 is a schematic view of a structure of a second subcomponent in some embodiments of the present application;

[0054] FIG. 12 is a schematic view of a first subcomponent in some embodiments of the present application;

[0055] FIG. 13 is a schematic view of a second electrode terminal, a first wall, and a second deformation member in some embodiments of the present application.

[0056] Icon: 10 - battery cell; 11 - housing; 110 - first wall; 1100 - first through hole; 1101 - second through hole; 1102 - third through hole; 1103 - fourth through hole; 111 - shell; 12 - electrode assembly; 120 - first tab; 121 - first adapter; 122 - second tab; 123 - second adapter; 13 - first electrode terminal; 130 - first conductive piece; 1300 - first sub-component; 13000 - first flange; 1301 - second sub-component; 13010 - first groove; 13011 - first protrusion; 13012 - second groove; 131 - first pole; 14 - first deformation piece; 15 - second electrode terminal; 150 - second conductive piece; 1500 - third sub-component; 1501 - fourth sub-component; 151 - second pole; 16 - second deformation piece; 170 - first insulating piece; 171 - second insulating piece; 172 - third insulating piece; 173 - fourth insulating piece; 174 - fifth insulating piece; 18 - flip tab; 180 - skirt; 181 - flip foil; 182 - electrical connection; z - thickness direction of the first wall; x - first direction; 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 2000 - energy storage device; 2001 - cabinet. DETAILED DESCRIPTION

[0057] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0060] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. One of ordinary skill in the art will readily recognize from the disclosure herein a wide number of variations, alternatives, and equivalents in the application that fall within the scope of the application. Those skilled in the art will readily recognize from the disclosure herein, extensive modifications within the scope of the application that would be or are equivalents of what is described herein.

[0061] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0062] In the description of the embodiments of the application, the term“a plurality of” means two or more (including two), and similarly, “a plurality of groups” means two or more groups (including two groups), and “a plurality of pieces” means two or more pieces (including two pieces).

[0063] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connecting”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0064] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cuboid or other shapes, etc. The embodiments of the present application are also not limited thereto. The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0065] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on the movement (e.g., deintercalation) of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that the fusing does not occur to a certain extent when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a stacking type structure, and the embodiments of the present application are not limited thereto.

[0066] The battery cell also includes a housing, and the electrode assembly and the electrolyte are arranged inside the housing. The housing has a first wall, the first wall is provided with an electrode terminal, the electrode terminal is connected with the electrode assembly, and the electrode terminal is used for input and output of electric energy. In some embodiments, the electrode terminal includes a conductive piece and a pole connected with each other, the conductive piece is located on the outside of the first wall and is used for connecting with a busbar component outside to realize input and output of electric energy, and the pole is connected with the pole tab of the electrode assembly directly or indirectly.

[0067] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge-discharge rate, in addition to the reliability of the battery.

[0068] In order to reduce the risk of thermal runaway of the battery cell under abuse conditions such as overcharging, some battery cells currently have an overcharge protection structure. Exemplarily, the overcharge protection structure includes a deformation piece, and the deformation piece is electrically connected with the housing. Under abuse conditions such as overcharging, when the internal pressure of the battery cell increases to a certain extent, the deformation piece deforms under the action of the internal pressure to contact the electrode terminal, for example, to connect with the conductive piece, so that the housing and the electrode terminal are short-circuited, the positive and negative electrodes of the battery cell are short-circuited to cause internal short circuit of the battery cell, and the electric connection component in the battery cell is fused due to the large current generated by the short circuit, thereby cutting off the charge-discharge circuit of the battery cell and playing a role of overcharge protection.

[0069] However, the large current generated at the moment when the deformation member contacts the electrode terminal can cause the deformation member or the part where the deformation member contacts the electrode terminal to melt and form a circuit before the electrical connection member, resulting in that the electrical connection member cannot be fused, the charging and discharging circuit of the battery cell cannot be cut off, the overcharge protection fails, and the reliability of the battery cell is affected, so that the reliability of the battery is low.

[0070] In view of this, in order to improve the problem that the deformation member or the part where the deformation member contacts the electrode terminal melts and forms a circuit before the electrical connection member, resulting in that the electrical connection member cannot be fused, the charging and discharging circuit of the battery cell cannot be cut off, the overcharge protection fails, and the reliability of the battery is affected, some embodiments of the present application provide a battery cell. The battery cell comprises a shell, a first conductive member, a first pole and a first deformation member. The shell has a first wall. The first conductive member is arranged outside the first wall and insulated from the first wall, and the first conductive member comprises a first sub-component and a second sub-component connected to each other, and the second sub-component is used to connect with a busbar component. The first pole is connected with the second sub-component. The first deformation member is electrically connected with the first wall, and the first deformation member is configured to be deformable to contact the first sub-component to electrically connect the first pole with the first wall.

[0071] In the above scheme, by arranging the first sub-component to contact the deformed first deformation member, the resistance value of the internal current loop of the battery cell can be increased, so that the current of the internal current loop of the battery cell is reduced, thereby reducing the risk that the first deformation member or the contact part between the first deformation member and the first conductive member melts due to excessive current, so that the first deformation member effectively plays a role of overcharge protection, thereby effectively improving the reliability of the battery cell under abuse working conditions such as overcharge, and further improving the reliability of the battery.

[0072] The technical solutions described in the embodiments of the present application are suitable for batteries, energy storage devices using batteries, and electric devices using batteries.

[0073] The energy storage device can include an energy storage container, an energy storage cabinet, etc. Illustratively, the energy storage cabinet can include a cabinet body and one or more batteries arranged on the cabinet body.

[0074] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The electric device in the embodiments of the present application includes but is not limited to the above-mentioned.

[0075] The following embodiments are described for convenience with the electric device being a vehicle as an example.

[0076] FIG. 1 is a schematic diagram of a vehicle in some embodiments of the present application.

[0077] The vehicle 1000 can be provided with a controller 200, a motor 300, and a battery 100. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000, and is used for the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Referring to FIG. 2, FIG. 2 is a schematic diagram of an energy storage device in some embodiments of the present application.

[0079] The energy storage device 2000 can include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 can be arranged in the cabinet 2001. The plurality of batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0080] Referring to FIG. 3, FIG. 3 is a perspective exploded view of the battery 100 in some embodiments of the present application.

[0081] The battery 100 includes the battery cell 10 and a case 30, and the battery cell 10 is accommodated in the case 30. The case 30 is configured to provide an accommodation space for the battery cell 10, and the case 30 can have various structures. In some embodiments, the case 30 can include a first case portion 31 and a second case portion 32, and the first case portion 31 and the second case portion 32 are coupled to each other to define the accommodation space for the battery cell 10. The second case portion 32 can be a hollow structure with one open end, and the first case portion 31 can be a plate structure. The first case portion 31 is coupled to the open end of the second case portion 32 to define the accommodation space together with the second case portion 32. Alternatively, the first case portion 31 and the second case portion 32 can both be hollow structures with one open end, and the open end of the first case portion 31 is coupled to the open end of the second case portion 32. Of course, the case 30 formed by the first case portion 31 and the second case portion 32 can have various shapes, such as a cylindrical shape or a cuboid shape.

[0082] In the battery 100, the battery cell 10 can be one or a plurality of battery cells, and each battery cell 10 can be fixed to the case 30 by a connecting member (e.g., a bolt) or can be fixed to the case 30 by adhesion.

[0083] Some embodiments of the present application provide a battery cell 10. Referring to FIGS. 4-8, FIG. 4 is a perspective exploded view of the battery cell 10 according to some embodiments of the present application, FIG. 5 is a perspective view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 6 is an internal schematic view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 7 is a schematic view of a first electrode terminal 13, a first wall 110, and a first deformation member 14 according to some embodiments of the present application, and FIG. 8 is a schematic view of a first conductive member 130 according to some embodiments of the present application.

[0084] The battery cell 10 includes a housing 11, a first conductive member 130, a first pole 131, and a first deformation member 14. The housing 11 has a first wall 110. The first conductive member 130 is disposed outside the first wall 110 and insulated from the first wall 110, and the first conductive member 130 includes a first sub-member 1300 and a second sub-member 1301 connected to each other, and the second sub-member 1301 is configured to be connected to a bus member. The first pole 131 is connected to the second sub-member 1301. The first deformation member 14 is electrically connected to the first wall 110, and the first deformation member 14 is configured to be deformed to be in contact with the first sub-member 1300 to electrically connect the first pole 131 to the first wall 110.

[0085] The shell 11 is used to accommodate the electrode assembly 12, and can also be used to accommodate an electrolyte, such as an electrolyte solution. Referring to FIG. 4, in some embodiments, the shell 11 includes a shell body 111 and an end cover. The shell body 111 has an accommodating cavity formed therein for accommodating the electrode assembly 12, and has an opening communicating with the accommodating cavity. The end cover is coupled to the opening of the shell body 111 and forms a sealed connection therewith to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cover can be coupled to the shell body 111 by welding, bonding, clamping or other coupling manners. Optionally, the shell 11 can also include a bottom plate, and the shell body 111 has two openings formed at two ends thereof, one of which is closed by the end cover and the other of which is closed by the bottom plate.

[0086] In some embodiments, the shell 11 can be made of metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. For another example, part of the shell 11 can be made of metal, and the rest of the shell 11 can be made of non-metal. For example, the end cover of the shell 11 can be made of metal, and the shell body 111 or other parts of the shell 11 can be made of non-metal.

[0087] In some embodiments, the electrode assembly 12 can be placed into the shell body 111 first, and then the electrolyte solution is filled into the shell body 111, and then the end cover is coupled to the opening of the shell body 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, the electrode assembly 12 can be placed into the shell body 111 first, and then the end cover is coupled to the opening of the shell body 111, and then the electrolyte solution is filled into the shell body 111 through a filling hole in the end cover, and then the filling hole is closed to complete the assembly of the battery cell 10.

[0088] The shell 11 can have various shapes, such as a cylindrical structure or a prismatic structure. The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 has a cylindrical structure, a cylindrical shell 11 can be selected. If the electrode assembly 12 has a flat structure, the shell 11 can be square.

[0089] The first wall 110 is part of the shell 11. The first wall 110 can be used to support the first electrode terminal 13 so that the first electrode terminal 13 is in a stable state to achieve input and output of electrical energy. In some embodiments, the first wall 110 can be part of the shell body 111, such as a side wall or a bottom wall of the shell body 111. In some embodiments, the first wall 110 can be the end cover.

[0090] The first electrode terminal 13 is a component mounted on the first wall 110, and is used to electrically connect with the electrode assembly 12, so as to make current flow into or out of the first tab 120 through the first electrode terminal 13. The first electrode terminal 13 and the first tab 120 have the same polarity. In some embodiments, the first electrode terminal 13 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 13 can be connected with the first tab 120 through a first adapter 121. For example, the first tab 120 of the electrode assembly 12 is composed of a plurality of first sub-tabs stacked together, and then one end of the first adapter 121 is welded with the first tab 120, and the other end of the first adapter 121 is welded with the first electrode terminal 13.

[0091] In some embodiments, the first electrode terminal 13 includes a first conductive piece 130 and a first pole 131. The first conductive piece 130 is located on the side of the first wall 110 away from the electrode assembly 12, and is used to connect with an external busbar component (such as a busbar). For example, the first conductive piece 130 is welded with the busbar component. The first pole 131 is connected with the first tab 120 of the electrode assembly 12, and is connected with the first tab 120 through the first adapter 121, for example. The first conductive piece 130 and the first pole 131 are connected with each other, and the connection relationship between the first conductive piece 130 and the first pole 131 includes welding, riveting, threaded connection or one-piece forming, etc. For example, in some embodiments, the first conductive piece 130 and the first pole 131 are riveted with each other. The first conductive piece 130 is generally plate-shaped, and is formed with a riveting hole. The first pole 131 is generally columnar, such as cylindrical or polygonal columnar, etc. Part of the first pole 131 passes through the first through hole 1100 of the first wall 110 and is riveted in the riveting hole, and the other part is located in the housing 11 and is connected with the first tab 120 through the first adapter 121.

[0092] In some embodiments, a first insulating piece 170 is arranged between the first conductive piece 130 and the first wall 110, and is used to insulate and isolate the first conductive piece 130 and the first wall 110. A second insulating piece 171 is arranged between the first pole 131 and the first wall 110, such as between the outer periphery of the first pole 131 and the hole wall of the first through hole 1100.

[0093] In some embodiments, the first insulating member 170 and / or the second insulating member 171 can be made of a material with a high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material. For example, in some embodiments of the present application, the first insulating member 170 and / or the second insulating member 171 can be made of an insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulating member 170 and / or the second insulating member 171 can also be made of polypropylene, polyethylene, or other materials with insulating properties.

[0094] In some embodiments, the first insulating member 170 and / or the second insulating member 171 can have a resistance value in units of megaohms (MΩ). For example, in some embodiments of the battery cell 10 provided by the present application, the first insulating member 170 and / or the second insulating member 171 can have a resistance value greater than or equal to 200 MΩ.

[0095] The first deformation member 14 is mounted to the first wall 110 and is electrically connected to the first wall 110. In some embodiments, the first deformation member 14 can be made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal. In some embodiments, the first deformation member 14 can be welded to the inner side of the first wall 110.

[0096] The first deformation member 14 is a structure that deforms under the internal pressure of the battery cell 10. The first deformation member 14 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure increases. When the internal pressure reaches a certain level, such as a first threshold value, the first deformation member 14 deforms to contact the first electrode terminal 13, thereby connecting the first wall 110 and the first electrode terminal 13, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0097] In some embodiments, the first deformation member 14 can be a flip tab 18 that flips under pressure. For example, referring to FIG. 9, which is a schematic view of the flip tab 18 in some embodiments of the present application, the flip tab 18 has a disc-shaped outer contour and includes, in order from the outside to the inside, a skirt 180, a flip foil 181, and an electrical connection portion 182. The skirt 180 can be connected to the first wall 110, and the flip foil 181 is thin and deforms to flip under pressure. After the flip foil 181 flips, the electrical connection portion 182 is pushed towards the first conductive member 130 of the first electrode terminal 13, so that the electrical connection portion 182 contacts the first conductive member 130.

[0098] Exemplarily, the first wall 110 has a second through hole 1101, and the skirt 180 of the first deformation piece 14 is welded to the first wall 110, so that the first deformation piece 14 closes the second through hole 1101. The flip foil 181 is in a collapsed state in a direction away from the first wall 110 in a natural state, and the flip foil 181 flips in a direction facing the first wall 110 when the internal pressure of the battery cell 10 reaches the first threshold value, so as to push the electrical connection part 182 to make the electrical connection part 182 contact the first conductive piece 130 through the second through hole 1101.

[0099] In some embodiments, the first pole 131 is electrically connected to the first tab 120 through the first adapter 121, and the second tab 122 of the electrode assembly 12 can be electrically connected to the shell 11, the second tab 122 being opposite in polarity to the first tab 120, the second tab 122 being directly or through the second adapter 123 connected to the shell 11, or a second electrode terminal 15 being provided on the shell 11 and electrically connected to the shell 11, the second tab 122 being directly or through the second adapter 123 connected to the second electrode terminal 15. When the internal pressure of the battery cell 10 reaches the first threshold value, the first deformation piece 14 deforms to short the first electrode terminal 13 and the shell 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause internal short circuit, and a large current generated instantaneously can melt the electrical connection member inside the battery cell 10 to cut off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 121 and / or the second adapter 123. Exemplarily, the first adapter 121 has a first melting part, and the thickness or width dimension of the first melting part can be smaller than that of the rest of the first adapter 121, so that the first melting part can be melted when a large current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 123 has a second melting part, so that the second melting part can be melted when a large current passes through, thereby breaking the current path of the second tab 122 and the second electrode terminal 15 or the shell 11.

[0100] In other embodiments, the first electrode terminal 13 is electrically connected to the first tab 120 via a first adapter 121. The second tab 122 of the electrode assembly 12 can be electrically connected to the second electrode terminal 15. The second tab 122 has the opposite polarity to the first tab 120. The second electrode terminal 15 can be insulatedly mounted to the housing 11, for example, insulatedly mounted to the first wall 110 of the housing 11. The second tab 122 can be electrically connected to the second electrode terminal 15 via a second adapter 123. The second electrode terminal 15 is correspondingly provided with a second deformable member 16, which is electrically connected to the housing 11. The second deformable member 16 is used to deform and contact the second electrode terminal 15 when the internal pressure of the battery cell 10 reaches a second threshold, so as to electrically connect the second electrode terminal 15 to the housing 11.

[0101] When the internal pressure of the battery cell 10 reaches a certain level, such as a first threshold, the first deformable member 14 deforms and contacts the first conductive member 130, short-circuiting the first electrode terminal 13 and the outer casing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 16 deforms, short-circuiting the second electrode terminal 15 and the outer casing 11, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to form an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thus playing the role of overcharge protection. The melted electrical connection components may include a first adapter 121 and / or a second adapter 123. For example, the first adapter 121 has a first fusible part, which can melt when a large current passes through, thereby disconnecting the current path between the first tab 120 and the first electrode terminal 13. For example, the second adapter 123 has a second fuse portion that can melt when a large current passes through, thereby disconnecting the current path between the second tab 122 and the second electrode terminal 15.

[0102] In some embodiments, the first conductive element 130 includes a first sub-component 1300 and a second sub-component 1301 connected to each other. Both the first sub-component 1300 and the second sub-component 1301 have conductive characteristics. The first sub-component 1300 and the second sub-component 1301 can be made of metallic materials or other conductive materials, such as aluminum, aluminum alloy, stainless steel, copper, etc.

[0103] The first sub-component 1300 and the second sub-component 1301 may be made of the same or different materials. For example, the first sub-component 1300 and the second sub-component 1301 may both be made of aluminum; or the first sub-component 1300 may be made of stainless steel and the second sub-component 1301 may be made of aluminum.

[0104] The first sub-component 1300 is configured to contact the first deformation member 14, so that the positive and negative electrodes inside the battery monomer 10 are short-circuited to cause internal short circuit, and the large current generated instantaneously can melt the electrical connection component inside the battery monomer 10 to cut off the charging and discharging circuit of the battery monomer 10, thereby playing a role of overcharge protection.

[0105] The second sub-component 1301 is configured to be connected with the busbar component. For example, in some embodiments, the current in the charging and discharging circuit of the battery monomer 10 can flow through the first tab 120, the first adapter 121, the first pole 131, and the second sub-component 1301 to the busbar component. For example, in some embodiments, when the internal pressure of the battery monomer 10 reaches a certain degree, the first deformation member 14 is deformed, and the current can flow through the first tab 120, the first adapter 121, the first pole 131, the second sub-component 1301 to the first wall 110.

[0106] In some embodiments, the first sub-component 1300 can be a component arranged on the side of the second sub-component 1301 facing the first wall 110, for example, the first sub-component 1300 is welded on the inner side of the second sub-component 1301. In some embodiments, the inner side of the second sub-component 1301 is formed with a groove, and the first sub-component 1300 can be partially arranged in the groove.

[0107] The first deformation member 14 is electrically connected with the first conductive member 130, which can cause internal short circuit of the battery monomer 10, thereby realizing the function of overcharge protection. In the above scheme, by arranging the first sub-component 1300 to contact the deformed first deformation member 14, the resistance value of the current loop inside the battery monomer 10 can be increased, so that the current of the current loop inside the battery monomer 10 is reduced, thereby reducing the risk that the contact part between the first deformation member 14 or the first deformation member 14 and the first conductive member 130 is melted due to excessive current, so that the first deformation member 14 fails to realize internal short circuit of the battery monomer 10 to melt the electrical connection component inside the battery monomer 10, thereby cutting off the charging and discharging circuit of the battery monomer 10 to realize overcharge protection, thereby effectively improving the reliability of the battery monomer 10 under overcharge and other abuse conditions, and further improving the reliability of the battery 100.

[0108] According to some embodiments of the present application, the resistivity of the first sub-component 1300 is greater than the resistivity of the second sub-component 1301.

[0109] The resistivity is a physical quantity describing the resistance of a material to the flow of current, and the resistivity affects the resistance of the material. The resistance is the product of the resistivity, the length of the material, and the cross-sectional area. In some embodiments, the measurement method of resistivity can include direct measurement method, four-probe method, volume resistivity measurement, or measurement according to the standard GB / T 351-2019 "Metallic Materials-Electrical Resistivity Measurement Methods".

[0110] In some embodiments, the first sub-component 1300 can have a greater resistivity than the second sub-component 1301, so as to effectively increase the resistance in the current loop when the first deformation member 14 contacts the first conductive member 130. For example, when the second sub-component 1301 is made of aluminum, the first sub-component 1300 can be made of a material with a greater resistivity, such as stainless steel.

[0111] In some embodiments, the first sub-component 1300 can have a greater resistivity, so as to be arranged in a smaller volume to reasonably utilize the space. For example, the inner side of the second sub-component 1301 can be slotted, and the first sub-component 1300 can be arranged in the slot, so as to reduce the impact of the arrangement of the first sub-component 1300 on the volume of the first conductive member 130.

[0112] In the above scheme, by arranging the first sub-component 1300 to have a greater resistivity than the second sub-component 1301, on the one hand, the internal current loop of the battery monomer 10 can be effectively increased when the first deformation member 14 contacts the first conductive member 130, so as to reduce the risk that the contact part between the first deformation member 14 or the first deformation member 14 and the first conductive member 130 is damaged due to a large current and thus the overcharge protection fails; on the other hand, by arranging the first sub-component 1300 to have a greater resistivity, the space occupied by the first sub-component 1300 can be reduced, and the space utilization of the first conductive member 130 can be improved, thereby facilitating the improvement of the volume energy density of the battery monomer 10 and the battery 100.

[0113] In other embodiments, the first sub-component 1300 can have a resistivity equal to that of the second sub-component 1301, in which case the first sub-component 1300 can be arranged in a larger volume. In other embodiments, the first sub-component 1300 can have a resistivity less than that of the second sub-component 1301, in which case the first sub-component 1300 can be arranged in an even larger volume.

[0114] According to some embodiments of the present application, the first sub-component 1300 is made of stainless steel, and the second sub-component 1301 is made of aluminum.

[0115] In some embodiments, the first sub-component 1300 can have a greater resistivity than the second sub-component 1301, for example, the first sub-component 1300 is made of stainless steel, and the second sub-component 1301 is made of aluminum. In some embodiments, the first sub-component 1300 and the second sub-component 1301 can be connected by riveting, clamping, or threaded connection.

[0116] In the above scheme, by setting the material of the first sub-component 1300 to stainless steel and the material of the second sub-component 1301 to aluminum, on the one hand, the internal current loop of the battery monomer 10 passes through the first deformation piece 14, so that the current is reduced, and the risk that the first deformation piece 14 melts before the electrical connection member inside the battery monomer 10 to cause overcharge protection to fail is reduced. On the other hand, because the resistivity of stainless steel is greater than that of aluminum, the occupation of space by the first sub-component 1300 can be effectively reduced, which is beneficial to the improvement of the volume energy density of the battery monomer 10 and the battery 100.

[0117] According to some embodiments of the present application, the resistance of the first sub-component 1300 is not less than 0.3 milliohm and not greater than 3 milliohm.

[0118] In some embodiments, the resistance of the first sub-component 1300 can be not less than 0.3 milliohm and not greater than 3 milliohm, so that when the first deformation piece 14 contacts the first conductive piece 130, the value of the resistance in the current loop is not less than 0.3 milliohm and not greater than 3 milliohm.

[0119] For example, the value of the resistance of the first sub-component 1300 can be 0.3 milliohm, 0.4 milliohm, 0.5 milliohm, 0.6 milliohm, …, 1.2 milliohm, 1.3 milliohm, 1.4 milliohm, 1.5 milliohm, 1.6 milliohm, …, 2.8 milliohm, 2.9 milliohm, 3 milliohm, or any value between any two adjacent values.

[0120] In some embodiments, the value of the resistance of the first sub-component 1300 can be measured by using a multimeter, voltammetry, four-probe method, Wheatstone bridge method, etc.

[0121] In the above scheme, by setting the resistance of the first sub-component 1300 to not less than 0.3 milliohm, when the first deformation piece 14 deforms and contacts the first sub-component 1300, the current value of the internal current loop of the battery monomer 10 can be effectively reduced, thereby reducing the risk that the first deformation piece 14 or the first deformation piece 14 and the first sub-component 1300 melt due to a large current, resulting in overcharge protection failure. By setting the resistance of the first sub-component 1300 to not greater than 3 milliohm, when the first deformation piece 14 deforms and contacts the first sub-component 1300, the current value of the internal current loop of the battery monomer 10 can be appropriately sized to melt the electrical connection member inside the battery monomer 10, thereby cutting off the charging and discharging circuit of the battery monomer 10 to achieve overcharge protection. Therefore, by setting the resistance of the first sub-component 1300 to not less than 0.3 milliohm and not greater than 3 milliohm, the reliability of the overcharge protection of the battery monomer 10 can be ensured to some extent, thereby effectively improving the reliability of the battery 100.

[0122] According to some embodiments of the present application, referring to FIGS. 10-12, FIG. 10 is a perspective exploded view of the first sub-component 1300 and the second sub-component 1301 according to some embodiments of the present application, FIG. 11 is a structural schematic view of the second sub-component 1301 according to some embodiments of the present application, and FIG. 12 is a schematic view of the first sub-component 1300 according to some embodiments of the present application. The side of the second sub-component 1301 facing the first wall 110 is formed with a first recess 13010, and at least part of the first sub-component 1300 is arranged in the first recess 13010.

[0123] The side of the second sub-component 1301 facing the first wall 110 can be the inner side of the second sub-component 1301. In some embodiments, the second sub-component 1301 is generally plate-shaped, and the second sub-component 1301 has an inner surface facing the first wall 110.

[0124] The first recess 13010 can be a groove structure formed on the inner side or the inner surface of the second sub-component 1301, and the first recess 13010 can be formed by grooving, integral molding, or the like. In some embodiments, the shape of the first recess 13010 is generally circular, and in other embodiments, the shape of the first recess 13010 can be square, triangular, oval, or other shapes.

[0125] “At least part of the first sub-component 1300 is arranged in the first recess 13010” can be understood as the entire first sub-component 1300 being arranged in the first recess 13010, or part of the first sub-component 1300 being arranged in the first recess 13010, and another part of the first sub-component 1300 being located outside the first recess 13010.

[0126] In some embodiments, the first sub-component 1300 can be connected to the groove bottom wall and / or the groove peripheral wall of the first recess 13010 by welding, soldering, clamping, riveting, or threaded connection.

[0127] In some embodiments, the second sub-component 1301 is formed with a rivet hole 13013 for riveting with the first pole 131.

[0128] In the above scheme, by arranging the first recess 13010 on one side of the second sub-component 1301, on the one hand, the mutual connection of the first sub-component 1300 and the second sub-component 1301 can be achieved, so as to improve the reliability of the overcharge protection of the battery monomer 10; on the other hand, the space occupied by the first sub-component 1300 and the second sub-component 1301 can be reduced, so that the structure of the first conductive member 130 is compact, which is beneficial to the improvement of the volume energy density of the battery monomer 10 and the battery 100.

[0129] According to some embodiments of the present application, referring to FIGS. 8 and 11, the inner circumferential surface of the first recess 13010 is formed with a first protrusion 13011, and a portion of the first sub-component 1300 is located on the side of the first protrusion 13011 away from the first wall 110 in the thickness direction z of the first wall.

[0130] The first protrusion 13011 is a component provided on the inner circumferential surface of the first recess 13010, and the first protrusion 13011 can be in contact with the first sub-component 1300 to limit the first sub-component 1300 from being separated from the second sub-component 1301. For example, the first recess 13010 is a circular groove, and the first protrusion 13011 is provided on the inner circumferential surface of the first recess 13010 in the radial direction of the first recess 13010, so that the size of the opening of the first recess 13010 is reduced to enable a portion of the first sub-component 1300 to be located between the first protrusion 13011 and the bottom wall of the first recess 13010.

[0131] In some embodiments, the first protrusion 13011 can be provided on the inner circumferential surface of the first recess 13010 by means of bonding, welding, clamping, or threaded connection, etc. In some embodiments, the first protrusion 13011 can be formed on the second sub-component 1301 by means of extrusion, stamping, etc. In some embodiments, the first recess 13010 and the first protrusion 13011 can be formed by integral molding such as casting, etc.

[0132] In some embodiments, the outer circumferential surface of the first sub-component 1300 can be formed with a flange or a recess, and the first protrusion 13011 abuts against the flange or is provided in the recess to limit the movement of the first sub-component 1300 in the thickness direction z of the first wall. In other embodiments, the entire first sub-component 1300 is located in the first recess 13010, and the first protrusion 13011 can be in contact with the side of the first sub-component 1300 facing the inside of the battery cell 10.

[0133] In some embodiments, the first protrusion 13011 can be located in the middle of the inner circumferential surface of the first recess 13010, dividing the first recess 13010 into two parts. In some embodiments, the first protrusion 13011 can be provided adjacent to the opening of the first recess 13010.

[0134] The "portion of the first sub-component 1300 is located on the side of the first protrusion 13011 away from the first wall 110 in the thickness direction z of the first wall" can be understood as that, in the thickness direction z of the first wall, the portion of the first sub-component 1300 is located between the first protrusion 13011 and the groove bottom wall of the first groove 13010, and the other portion is located on the side of the first protrusion 13011 away from the first wall 110. Exemplarily, the first protrusion 13011 can be arranged adjacent to the slot opening of the first groove 13010, the portion of the first sub-component 1300 is located in the first groove 13010, and the other portion of the first sub-component 1300 protrudes from the first protrusion 13011 in the thickness direction z of the first wall and is located outside the first groove 13010.

[0135] In some embodiments, the first sub-component 1300 can protrude from the side of the second sub-component 1301 facing the first wall 110.

[0136] In the above scheme, by arranging the first protrusion 13011 on the inner circumferential surface of the first groove 13010, the first protrusion 13011 can be in contact with the first sub-component 1300, thereby limiting a portion of the first sub-component 1300 in the first groove 13010, reducing the risk that the first sub-component 1300 and the second sub-component 1301 are separated from each other, causing the overcharge protection of the battery monomer 10 to fail, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery 100.

[0137] According to some embodiments of the present application, the first protrusion 13011 is an annular structure extending in the circumferential direction of the first groove 13010.

[0138] In some embodiments, the first protrusion 13011 is an annular structure connected head to tail, and the first protrusion 13011 is arranged on the inner circumferential surface of the first groove 13010 and can surround a circle.

[0139] In the above scheme, by arranging the first protrusion 13011 as an annular structure, the first sub-component 1300 can be effectively contacted in the circumferential direction of the first groove 13010, thereby effectively improving the structural stability between the first sub-component 1300 and the second sub-component 1301, reducing the risk that the first sub-component 1300 and the second sub-component 1301 are separated from each other, causing the overcharge protection of the battery monomer 10 to fail, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery 100.

[0140] In other embodiments, the first protrusion 13011 can be a block structure, a tooth structure, or the like. When the first protrusion 13011 can be a block structure, a tooth structure, or the like, a plurality of first protrusions 13011 can be distributed at intervals in the circumferential direction of the first groove 13010.

[0141] According to some embodiments of the present application, referring to FIG. 8 and FIG. 12, the outer circumferential surface of the first sub-component 1300 is formed with a first flange 13000, which is located on the side of the first protrusion 13011 away from the first wall 110 in the thickness direction z of the first wall.

[0142] The first flange 13000 is a protruding structure formed on the outer circumferential surface of the first sub-component 1300. In some embodiments, the first flange 13000 can cooperate with the first protrusion 13011, the first flange 13000 is located on the side of the first protrusion 13011 away from the first wall 110, and the first flange 13000 and the first protrusion 13011 abut each other in the thickness direction z of the first wall.

[0143] In some embodiments, the first flange 13000 can be arranged on the outer circumferential surface of the main body of the first sub-component 1300 by bonding, welding, clamping, or threaded connection, etc. In some embodiments, the first flange 13000 can be formed on the first sub-component 1300 by extrusion, stamping, etc. In some embodiments, the first sub-component 1300 and the first flange 13000 can be formed by integral molding such as casting, etc.

[0144] For example, the main body of the first sub-component 1300 is cylindrical, the first flange 13000 is formed on one end of the first sub-component 1300, and the first flange 13000 protrudes from the main body so that the radial dimension of the part of the first sub-component 1300 corresponding to the first flange 13000 is larger than that of other parts. Referring to FIG. 8, the outer circumferential surface of the first flange 13000 can include a bevel, a straight surface, and a bevel, the straight surface is located between the two bevels, and the two bevels are respectively transitionally connected to the main body of the first sub-component 1300.

[0145] For example, the first flange 13000 is located at the upper end of the first sub-component 1300, and the lower end of the first sub-component 1300 can be located on the side of the first protrusion 13011 away from the first wall 110.

[0146] In the above scheme, by arranging the first flange 13000 to abut the first protrusion 13011, the first sub-component 1300 can be stably arranged in the first groove 13010, thereby improving the structural stability between the first sub-component 1300 and the second sub-component 1301, reducing the risk that the first sub-component 1300 and the second sub-component 1301 are separated from each other, causing the overcharge protection of the battery monomer 10 to fail, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery 100.

[0147] According to some embodiments of the present application, the first flange 13000 is an annular structure extending along the circumferential direction of the first groove 13010.

[0148] In some embodiments, the first flange 13000 is a ring structure connected head to tail, and the first flange 13000 is arranged on the outer circumferential surface of the main body of the first sub-component 1300 and can surround a circle.

[0149] In the above scheme, by arranging the first flange 13000 as a ring structure, the first flange 13000 can effectively contact the first protrusion 13011 in the circumferential direction of the first groove, thereby effectively improving the structural stability between the first sub-component 1300 and the second sub-component 1301, reducing the risk of the first sub-component 1300 and the second sub-component 1301 being separated from each other, causing the overcharge protection of the battery monomer 10 to fail, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery 100.

[0150] According to some embodiments of the present application, in a direction pointing to the inside of the battery monomer 10, the first sub-component 1300 protrudes from the side of the second sub-component 1301 facing the first wall.

[0151] In some embodiments, in a direction pointing to the inside of the battery monomer 10, the first sub-component 1300 can protrude from the inner side of the second sub-component 1301.

[0152] In the above scheme, by arranging the first sub-component 1300 to protrude from the side of the second sub-component 1301 facing the first wall 110, the first sub-component 1300 can be facilitated to contact the first deformation piece 14, thereby improving the reliability of the overcharge protection of the battery monomer 10, and further improving the reliability of the battery 100.

[0153] According to some embodiments of the present application, referring to FIGS. 8 and 11, the side of the second sub-component 1301 facing the first wall 110 is formed with a second groove 13012, the first groove 13010 is arranged on the groove bottom surface of the second groove 13012, and the side of the first protrusion 13011 facing the first wall 110 is coplanar with the groove bottom surface of the second groove 13012.

[0154] The side of the second sub-component 1301 facing the first wall 110 can be regarded as the inner side of the second sub-component 1301, the second groove 13012 can be a groove structure formed on the inner side of the second sub-component 1301, and the second groove 13012 corresponds to the first groove 13010. In some embodiments, the first groove 13010 and the second groove 13012 are coaxially arranged.

[0155] In some embodiments, the radial dimension of the first groove 13010 is smaller than the radial dimension of the second groove 13012.

[0156] In some embodiments, the first flange 13000 is formed by stamping or extruding, for example, the inner side of the second sub-component 1301 has a first groove 13010, the first sub-component 1300 is assembled into the first groove 13010, and the inner side of the second sub-component 1301 is stamped or extruded so that the inner side of the second sub-component 1301 is partially deformed to form a first protrusion 13011 that abuts against the first sub-component 1300 and a second groove 13012.

[0157] In the above scheme, the part of the second sub-component 1301 facing the first wall 110 and surrounding the first sub-component 1300 can be stamped to form the first protrusion 13011 and the second groove 13012, thereby effectively improving the structural stability between the first sub-component 1300 and the second sub-component 1301, reducing the risk of the first sub-component 1300 and the second sub-component 1301 being separated from each other, causing the overcharge protection of the battery monomer 10 to fail, thereby improving the reliability of the battery monomer 10 and further improving the reliability of the battery 100. In some embodiments, by providing the second groove 13012, the mass of the first conductive member 130 can be reduced, thereby facilitating the improvement of the mass energy density of the battery monomer 10.

[0158] According to some embodiments of the present application, the maximum size of the first sub-component 1300 in the thickness direction z of the first wall is not less than 0.1 mm and not greater than 5 mm.

[0159] In some embodiments, referring to FIG. 12, the maximum size of the first sub-component 1300 in the thickness direction z of the first wall is H, and H can be not less than 0.1 mm and not greater than 5 mm. For example, the maximum size H of the first sub-component 1300 in the thickness direction z of the first wall can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 4.7 mm, 4.8 mm, 5 mm, or any value between any two adjacent values.

[0160] In the above scheme, by setting the maximum dimension of the first sub-component 1300 in the thickness direction z of the first wall to be not less than 0.1 mm, the resistance value of the first sub-component 1300 is appropriate, which can effectively reduce the risk that the contact part between the first deformation member 14 or the first deformation member 14 and the first conductive member 130 is melted due to excessive current, causing the first deformation member 14 to fail to achieve internal short circuit of the battery monomer 10 to melt the internal electrical connection member of the battery monomer 10, thereby cutting off the charging and discharging circuit of the battery monomer 10 to achieve overcharge protection; by setting the maximum dimension of the first sub-component 1300 in the thickness direction z of the first wall to be not more than 5 mm, the space occupied by the first sub-component 1300 can be reduced, the space utilization rate of the first conductive member 130 can be improved, and the volume energy density of the battery monomer 10 can be higher. Therefore, by setting the maximum dimension of the first sub-component 1300 in the thickness direction z of the first wall to be not less than 0.1 mm and not more than 5 mm, the reliability of overcharge protection and the volume energy density of the battery monomer 10 can be considered.

[0161] According to some embodiments of the present application, please refer to FIG. 13, which is a schematic view of the second electrode terminal 15, the first wall 110 and the second deformation member 16 according to some embodiments of the present application. The battery monomer 10 further comprises a second conductive member 150, a second pole 151 and a second deformation member 16. The second conductive member 150 is disposed outside the first wall 110 and insulated from the first wall 110. The second pole 151 is connected with the second conductive member 150. The second deformation member 16 is electrically connected with the first wall 110, and is configured to be deformed to contact with the second conductive member 150 to electrically connect the second pole 151 with the first wall 110.

[0162] In some embodiments, the battery monomer 10 further comprises a second electrode terminal 15 electrically connected with the second tab 122 of the electrode assembly 12 for connecting with external busbar. The polarity of the second electrode terminal 15 is opposite to that of the first electrode terminal 13, for example, the first electrode terminal 13 is a positive electrode terminal, and the second electrode terminal 15 is a negative electrode terminal. The second electrode terminal 15 is used to electrically connect with the electrode assembly 12 to make current flow into or out of the second tab 122 through the second electrode terminal 15. In some embodiments, the second electrode terminal 15 is made of metal material, for example, made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second electrode terminal 15 can be connected with the second tab 122 through a second adapter 123. For example, the second tab 122 of the electrode assembly 12 is composed of a plurality of second sub-tabs stacked together, one end of the second adapter 123 can be welded with the second tab 122, and the other end of the second adapter 123 can be welded with the second electrode terminal 15.

[0163] In some embodiments, the second electrode terminal 15 includes a second conductive piece 150 and a second pole 151. The second conductive piece 150 is located on the side of the first wall 110 facing away from the electrode assembly 12, and is used to connect with an external busbar component (e.g., a tab). Exemplarily, the second conductive piece 150 is welded with the busbar component. The second pole 151 is connected with the second tab 122 of the electrode assembly 12, and is exemplarily connected with the second tab 122 through the second adapter 123. The second conductive piece 150 and the second pole 151 are connected with each other, and the connection relationship between the second conductive piece 150 and the second pole 151 includes welding, riveting, threaded connection, or one-piece forming, etc. Exemplarily, in some embodiments, the second conductive piece 150 and the second pole 151 are riveted with each other. The second conductive piece 150 is generally plate-shaped, and is formed with a riveting hole. The second pole 151 is generally columnar, such as cylindrical or polygonal columnar, etc. Part of the second pole 151 passes through the third through hole 1102 of the first wall 110 and is riveted in the riveting hole, and the other part is located in the shell 11 and is connected with the second tab 122 through the second adapter 123.

[0164] In some embodiments, a third insulating piece 172 is arranged between the second conductive piece 150 and the first wall 110, and is used to insulate and separate the second conductive piece 150 and the first wall 110. A fourth insulating piece 173 is arranged between the second pole 151 and the first wall 110, such as between the outer periphery of the second pole 151 and the hole wall of the third through hole 1102.

[0165] In some embodiments, the third insulating piece 172 and / or the fourth insulating piece 173 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material, etc. Exemplarily, in some embodiments of the present application, the material of the third insulating piece 172 and / or the fourth insulating piece 173 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the third insulating piece 172 and / or the fourth insulating piece 173 can also be made of polypropylene, polyethylene, or other materials with insulating properties.

[0166] In some embodiments, the resistance value of the third insulating piece 172 and / or the fourth insulating piece 173 can be in units of megaohms (MΩ). Exemplarily, in some embodiments of the battery cell 10 provided by the present application, the resistance value of the first insulating piece 170 and / or the second insulating piece 171 can be greater than or equal to 200 MΩ.

[0167] The second deformation member 16 is mounted on the first wall 110 and is electrically connected to the first wall 110. In some embodiments, the second deformation member 16 can be made of a metal material, for example, the second deformation member 16 is made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second deformation member 16 can be welded to the inner side of the first wall 110.

[0168] The second deformation member 16 is a structure member that deforms under the internal pressure of the battery cell 10. The second deformation member 16 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure increases, and when the internal pressure reaches a certain level, for example, the second threshold, the second deformation member 16 deforms to contact the second electrode terminal 15, thereby connecting the first wall 110 and the second electrode terminal 15, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0169] In some embodiments, the second deformation member 16 can be a flip sheet 18 that flips under pressure. For example, the first wall 110 has a fourth through hole 1103, and the skirt 180 of the second deformation member 16 is welded to the first wall 110, so that the second deformation member 16 closes the fourth through hole 1103. The flip foil 181 is in a collapsed state in the direction away from the first wall 110 in the natural state, and when the internal pressure of the battery cell 10 reaches the first threshold, the flip foil 181 flips in the direction facing the first wall 110 to push the electrical connection part 182, so that the electrical connection part 182 passes through the fourth through hole 1103 and contacts the second conductive part 150.

[0170] In some embodiments, the first threshold and the second threshold can be equal or not equal.

[0171] In some embodiments, when the battery cell 10 is in an abuse condition due to overcharge or the like, the internal pressure of the battery cell 10 increases, and when the internal pressure of the battery cell 10 reaches the first threshold, the first deformation member 14 deforms to short-circuit the first electrode terminal 13 and the housing 11, and when the internal pressure of the battery cell 10 reaches the second threshold, the second deformation member 16 deforms to short-circuit the second electrode terminal 15 and the housing 11, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to cause internal short-circuit. The large current generated instantaneously can melt the electrical connection member inside the battery cell 10, thereby cutting off the charging and discharging circuit of the battery cell 10, thereby playing a role in overcharge protection. The melted electrical connection member can include the first adapter 121 and / or the second adapter 123. For example, the first adapter 121 has a first melting part that can melt when a larger current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13.

[0172] In the above scheme, by setting the second deformable member 16, when the internal pressure of the battery cell 10 reaches a certain level, the deformation of the second deformable member 16 causes it to contact the second conductive member 150, thereby making the second terminal 151 electrically connected to the first wall 110. Combined with the contact between the first deformable member 14 and the first conductive member 130, the electrical connection components inside the battery cell 10 melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell 10, thus playing the role of overcharge protection and reducing the risk of thermal runaway of the battery cell 10, thereby making the battery 100 have high reliability.

[0173] According to some embodiments of this application, please refer to FIG13, the second conductive element 150 includes a third sub-component 1500 and a fourth sub-component 1501 connected to each other. The third sub-component 1500 is used to contact the second deformable element 16, and the fourth sub-component 1501 is used to connect to the busbar component. The second pole post 151 is connected to the fourth sub-component 1501.

[0174] The second conductive element 150 includes a third sub-component 1500 and a fourth sub-component 1501 that are interconnected. Both the third sub-component 1500 and the fourth sub-component 1501 are conductive and can be made of metallic materials or other conductive materials, such as aluminum, aluminum alloy, stainless steel, copper, etc.

[0175] The third sub-component 1500 and the fourth sub-component 1501 may be made of the same or different materials. For example, the third sub-component 1500 and the fourth sub-component 1501 may both be made of aluminum; or the third sub-component 1500 may be made of stainless steel and the fourth sub-component 1501 may be made of aluminum.

[0176] The third sub-component 1500 is used to contact the second deformable member 16. The fourth sub-component 1501 is used to connect to the busbar component. Exemplarily, in some embodiments, the current in the charging and discharging circuit of the battery cell 10 can flow through the second tab 122, the second adapter 123, the second terminal 151, and the fourth sub-component 1501 to the busbar component. Exemplarily, in some embodiments, when the internal pressure of the battery cell 10 reaches a certain level, the second deformable member 16 deforms, and the current can flow through the second tab 122, the second adapter 123, the second terminal 151, and the fourth sub-component 1501 to the first wall 110.

[0177] In some embodiments, the third sub-component 1500 may be a component disposed on the side of the fourth sub-component 1501 facing the first wall 110, for example, the third sub-component 1500 may be welded to the inner side of the fourth sub-component 1501. In some embodiments, a groove is formed on the inner side of the fourth sub-component 1501, and the third sub-component 1500 may be partially disposed in the groove.

[0178] In the above scheme, by setting the third sub-component 1500 to contact the deformed second deformable part 16, the resistance value of the internal current circuit of the battery cell 10 can be increased, thereby reducing the current in the internal current circuit of the battery cell 10. This reduces the risk of the second deformable part 16 or the contact part between the second deformable part 16 and the second conductive part 150 melting due to excessive current, causing the second deformable part 16 to fail and preventing the battery cell 10 from short-circuiting and melting the internal electrical connection components, thereby cutting off the charging and discharging circuit of the battery cell 10 and realizing overcharge protection. This effectively improves the reliability of the battery cell 10 under abuse conditions such as overcharging, and thus makes the battery 100 highly reliable.

[0179] In some other embodiments, the second conductive element 150 may not have a third sub-component 1500. For example, the second conductive element 150 may include a fourth sub-component 1501, which may be an aluminum structure for connection with the busbar component.

[0180] According to some embodiments of this application, the resistivity of the third sub-component 1500 is greater than the resistivity of the fourth sub-component 1501.

[0181] In some embodiments, the resistivity of the third sub-component 1500 may be greater than that of the fourth sub-component 1501, so as to effectively increase the resistance value in the current loop when the first deformed member 14 contacts the first conductive member 130. For example, when the fourth sub-component 1501 is made of aluminum, the third sub-component 1500 may be made of a material with a higher resistivity, such as stainless steel.

[0182] In some embodiments, the resistivity of the third sub-component 1500 is relatively high, which allows the volume of the third sub-component 1500 to be set smaller in order to make reasonable use of space. For example, a slot is made on the inner side of the fourth sub-component 1501, and the third sub-component 1500 is disposed in the slot, which can reduce the impact of the placement of the third sub-component 1500 on the volume of the first conductive element 130.

[0183] For example, the third sub-component 1500 is made of stainless steel, and the fourth sub-component 1501 is made of aluminum.

[0184] In the above scheme, by setting the resistivity of the third sub-component 1500 to be greater than that of the fourth sub-component 1501, on the one hand, when the second deformable member 16 contacts the second conductive member 150, the internal current loop of the battery cell 10 can be effectively increased, reducing the risk of structural damage caused by melting of the second deformable member 16 or the contact part between the second deformable member 16 and the second conductive member 150 due to a large current, resulting in the failure of overcharge protection; on the other hand, by setting the third sub-component 1500 with a larger resistivity, the space occupied by the third sub-component 1500 can be reduced, the space utilization rate of the second conductive member 150 can be improved, which is conducive to improving the volumetric energy density of the battery cell 10 and the battery 100.

[0185] In some embodiments, the resistivity of the third sub-component 1500 may be equal to the resistivity of the fourth sub-component 1501, in which case the volume of the third sub-component 1500 can be set to be larger. In other embodiments, the resistivity of the third sub-component 1500 may be less than the resistivity of the fourth sub-component 1501, in which case the volume of the third sub-component 1500 can be set to be even larger.

[0186] In some embodiments, the resistance of the third sub-component 1500 is not less than 0.3 milliohms and not greater than 3 milliohms. Exemplarily, the resistance value of the third sub-component 1500 can be 0.3 milliohms, 0.4 milliohms, 0.5 milliohms, 0.6 milliohms…1.2 milliohms, 1.3 milliohms, 1.4 milliohms, 1.5 milliohms, 1.6 milliohms…2.8 milliohms, 2.9 milliohms, 3 milliohms, or any value between two adjacent values.

[0187] In some embodiments, the sum of the resistance values ​​of the first sub-component 1300 and the third sub-component 1500 is not less than 0.3 milliohms and not greater than 3 milliohms.

[0188] In some embodiments, an assembly method for a third sub-component 1500 and a fourth sub-component 1501 is provided. Referring to FIG. 13, a third groove is formed on the side of the fourth sub-component 1501 facing the first wall 110, and a portion of the third sub-component 1500 is disposed in the third groove. A second protrusion is formed on the inner circumferential surface of the third groove, protruding radially along the third groove and forming an annular structure extending circumferentially along the third groove. A second flange is formed on the outer circumferential surface of the third sub-component 1500, which can mate with the second protrusion. The second flange is located on the side of the second protrusion facing away from the first wall 110, and the second flange and the second protrusion abut against each other in the thickness direction z of the first wall. The third sub-component 1500 can protrude from the side of the fourth sub-component 1501 facing the first wall 110 for contacting the second deformable member 16.

[0189] In some embodiments, a fourth groove is formed on the side of the fourth sub-component 1501 facing the first wall 110, a third groove is disposed on the bottom surface of the fourth groove, and the side of the second protrusion facing the first wall 110 is coplanar with the bottom surface of the fourth groove. In some embodiments, the second flange is formed by stamping or extrusion. For example, the inner surface of the fourth sub-component 1501 has a third groove. The third sub-component 1500 is assembled into the third groove, and the inner surface of the fourth sub-component 1501 is stamped or extruded, causing the inner surface of the fourth sub-component 1501 to be partially deformed, forming a second protrusion that abuts against the third sub-component 1500, and forming the fourth groove.

[0190] In some embodiments, the maximum dimension of the third sub-component 1500 along the thickness direction z of the first wall can be no less than 0.1 mm and no more than 5 mm. For example, the maximum dimension of the third sub-component 1500 along the thickness direction z of the first wall can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm…2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm…4.7 mm, 4.8 mm, 5 mm, or any value between two adjacent values.

[0191] According to some embodiments of this application, please refer to Figures 5 and 6. The first pole post 131 and the second pole post 151 are spaced apart along the first direction x. Along the first direction x, the first deformable member 14 is located on the side of the first pole post 131 opposite to the second pole post 151, and / or, the second deformable member 16 is located on the side of the second pole post 151 opposite to the first pole post 131.

[0192] The first direction x can be the arrangement direction of the first electrode terminal 13 and the second electrode terminal 15, and the first direction x is perpendicular to the thickness direction z of the first wall. For example, the first wall 110 is an end cap, the end cap is square, and the first direction x can be the length direction of the end cap.

[0193] "Along the first direction x, the first deformable member 14 is located on the side of the first pole post 131 away from the second pole post 151" can be understood as the first deformable member 14 being away from the middle of the first wall 110 relative to the first pole post 131, that is, the first deformable member 14 is on the outside and the first pole post 131 is on the inside.

[0194] "The second deformable member 16 is located on the side of the second pole post 151 away from the first pole post 131" can be understood as follows: along the first direction x, the second deformable member 16 is away from the middle of the first wall 110 relative to the second pole post 151, that is, the second deformable member 16 is on the outside and the second pole post 151 is on the inside.

[0195] In some embodiments, the positional relationship of the first deformable member 14, the first pole post 131, the second deformable member 16, and the second pole post 151 in the first direction x may include the following cases: Case 1, the first deformable member 14, the first pole post 131, the second pole post 151, and the second deformable member 16; Case 2, the first deformable member 14, the first pole post 131, the second deformable member 16, and the second pole post 151; Case 3, the first pole post 131, the first deformable member 14, the second pole post 151, and the second deformable member 16.

[0196] Compared to the above scheme where the electrode post is located on the outside of the corresponding deformable part, by placing the first deformable part 14 on the side of the first electrode post 131 away from the second electrode post 151, and / or placing the second deformable part 16 on the side of the second electrode post 151 away from the first electrode post 131, the propagation path of the current inside the battery cell 10 can be shortened, the internal resistance of the battery cell 10 can be reduced, and the charging and discharging performance of the battery 100 can be improved.

[0197] According to some embodiments of this application, a battery 100 is also provided, which has a battery cell 10 as described above. Referring to FIG3, the battery 100 includes a battery cell 10 and a housing, wherein the battery cell 10 is housed in the housing. The housing provides housing space for the battery cell 10, and the housing can adopt various structures.

[0198] In the battery 100, there can be one or more battery cells 10, and each battery cell 10 can be fixed to the housing by means of connectors (such as bolts), or each battery cell 10 can be fixed to the housing by means of adhesive bonding.

[0199] According to some embodiments of this application, an energy storage device 2000 is also provided, which includes the battery cell 10 described above.

[0200] In some embodiments, the battery cells 10 can first form a battery 100, and one or more batteries 100 are then applied to the energy storage device. Referring to Figure 2, the energy storage device 2000 may include a cabinet 2001 and multiple batteries 100. The multiple batteries 100 may be disposed within the cabinet 2001. The multiple batteries 100 may be connected in series, in parallel, or in a mixed configuration.

[0201] According to some embodiments of this application, an electrical device is also provided, which includes the battery cell 10 described above. In some embodiments, the battery cell 10 first constitutes a battery 100, and one or more batteries 100 are then applied in the electrical device.

[0202] In some embodiments, referring to FIG1, the electrical device is a vehicle 1000. The interior of the vehicle 1000 may be equipped with a controller 200, a motor 300 and a battery 100, and the controller 200 is used to control the battery 100 to supply power to the motor 300.

[0203] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 4-13.

[0204] The battery 100 includes a casing 11, an electrode assembly 12, a first electrode terminal 13, a first deformable part 14, a second electrode terminal 15, and a second deformable part 16.

[0205] The housing 11 includes a shell 111 and a first wall 110. A receiving cavity is formed inside the shell 111 for accommodating the electrode assembly 12. The shell 111 has an opening communicating with the receiving cavity. The first wall 110 covers the opening of the shell 111 and forms a sealed connection to create a sealed space for accommodating the electrode assembly 12 and the electrolyte. In some embodiments, the number of electrode assemblies 12 can be one or more. Exemplarily, the number of electrode assemblies 12 is two, and the two electrode assemblies 12 are stacked.

[0206] The first electrode terminal 13, the first deformable member 14, the second electrode terminal 15, and the second deformable member 16 are mounted on the first wall 110. The first electrode terminal 13 is insulated from the first wall 110 by an insulating structure, the second electrode terminal 15 is insulated from the first wall 110 by an insulating structure, and the first deformable member 14 and the second deformable member 16 are respectively welded to the inner surface of the first wall 110 and electrically connected to the first wall 110.

[0207] In some embodiments, a fifth insulating member 174 is provided on the inner side of the first wall 110, and the fifth insulating member 174 can insulate the isolation electrode assembly 12 and the first wall 110.

[0208] In some embodiments, the first electrode terminal 13 includes a first conductive element 130 and a first electrode post 131 riveted together. The first conductive element 130 is located on the side of the first wall 110 opposite to the electrode assembly 12 and is used to connect to an external busbar (e.g., a power strip). A portion of the first electrode post 131 is located in the housing 11 and is connected to the first tab 120 of the electrode assembly 12 via a first adapter 121.

[0209] A first insulating element 170 is provided between the first conductive element 130 and the first wall 110, and a second insulating element 171 is provided between the first pole post 131 and the first wall 110.

[0210] In some embodiments, the first conductive element 130 includes a first sub-component 1300 and a second sub-component 1301 connected to each other. The first sub-component 1300 may be made of stainless steel, and the second sub-component 1301 may be made of aluminum. The first terminal post 131 is riveted to the second sub-component 1301, and the second sub-component 1301 is used to connect to the busbar component. In some embodiments, the first sub-component 1300 is generally cylindrical, and the second sub-component 1301 is elongated.

[0211] In some embodiments, the first wall 110 is formed with a second through hole 1101, and the first deformable member 14 closes the second through hole 1101.

[0212] In some embodiments, a first groove 13010 is formed on the inner side of the second sub-component 1301. The first sub-component 1300 may be partially disposed in the first groove 13010, for example, assembled in the first groove 13010 by a stamping process. Another part of the first sub-component protrudes toward the second through hole 1101.

[0213] For example, referring to FIG8, a first flange 13000 is formed at the upper end of the first sub-component 1300, and a first groove 13010 is formed by slotting the inner side of the second sub-component 1301. The upper end of the first sub-component 1300 is placed in the first groove 13010. The inner side of the second sub-component 1301 is stamped or extruded along the circumference of the first sub-component 1300, causing the inner side of the second sub-component 1301 to be partially deformed. A first protrusion 13011 is formed on the inner circumferential surface of the first groove 13010, which abuts against the first flange 13000, and a second groove 13012 is formed on the inner side of the second sub-component 1301.

[0214] In some embodiments, the second electrode terminal 15 includes a second conductive element 150 and a second electrode post 151 riveted together. The second conductive element 150 is located on the side of the first wall 110 opposite to the electrode assembly 12 and is used to connect to an external busbar (e.g., a power strip). A portion of the second electrode post 151 is located in the housing 11 and is connected to the second tab 122 of the electrode assembly 12 via a second adapter 123.

[0215] A third insulating element 172 is provided between the second conductive element 150 and the first wall 110, and a fourth insulating element 173 is provided between the second pole post 151 and the first wall 110.

[0216] In some embodiments, the second conductive element 150 includes a third sub-component 1500 and a fourth sub-component 1501 connected to each other. The third sub-component 1500 may be made of stainless steel, and the fourth sub-component 1501 may be made of aluminum. The second terminal 151 is riveted to the fourth sub-component 1501, and the fourth sub-component 1501 is used to connect to the busbar component. In some embodiments, the third sub-component 1500 is generally cylindrical, and the fourth sub-component 1501 is elongated.

[0217] In some embodiments, the first wall 110 is formed with a fourth through hole 1103, and the second deformable member 16 closes the fourth through hole 1103.

[0218] In some embodiments, a third groove is formed on the inner side of the fourth sub-component 1501, and the third sub-component 1500 may be partially disposed in the third groove, for example, assembled into the third groove by a stamping process, with another part of the third sub-component protruding toward the fourth through hole 1103. Exemplarily, a second flange is formed at the upper end of the third sub-component 1500, and a third groove is formed by slotting on the inner side of the fourth sub-component 1501, with the upper end of the third sub-component 1500 inserted into the third groove. The inner side of the fourth sub-component 1501 is stamped or extruded along its circumference, causing partial deformation of the inner side of the fourth sub-component 1501, forming a second protrusion on the inner circumferential surface of the third groove that abuts against the second flange, and forming a fourth groove on the inner side of the fourth sub-component 1501.

[0219] The first deformable member 14 and the second deformable member 16 can be structural members that deform under pressure. In some embodiments, the first deformable member 14 and the second deformable member 16 can each be a flipping piece 18, which flips under pressure.

[0220] In some embodiments, when a battery cell 10 is in an abused condition due to overcharging, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches a first threshold, the first deformable member 14 deforms and contacts the first sub-component 1300, short-circuiting the first electrode terminal 13 and the outer casing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 16 deforms and contacts the third sub-component 1500, short-circuiting the second electrode terminal 15 and the outer casing 11. This causes the positive and negative electrodes of the battery cell 10 to be short-circuited internally, creating an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby providing overcharge protection. The melted electrical connection components may include the first adapter 121 and / or the second adapter 123. For example, the first adapter 121 has a first fuse portion that can be melted when a large current passes through, thereby breaking the current path between the first tab 120 and the first electrode terminal 13.

[0221] In some embodiments, when the battery cell 10 is charging and discharging normally, the current in the charging and discharging circuit of the battery cell 10 can enter the battery cell 10 through the busbar corresponding to the second electrode terminal 15 via the fourth sub-component 1501, and then flow through the second sub-component 1301 to the busbar corresponding to the second sub-component 1301. For example, the current path can be the fourth sub-component 1501, the second terminal 151, the second adapter 123, the second tab 122, the electrode assembly 12, the first tab 120, the first adapter 121, the first terminal 131, and the second sub-component 1301. For example, in some embodiments, when the internal pressure of the battery cell 10 reaches a certain level, the first deformable member 14 deforms, the second deformable member 16 deforms, and the battery cell 10 is short-circuited internally. The current path can be the second tab 122, the second adapter 123, the second terminal 151, the fourth sub-component 1501, the third sub-component 1500, the second deformable member 16, the first wall 110, the first deformable member 14, the first sub-component 1300, the second sub-component 1301, the first terminal 131, the first adapter 121, and the first tab 120.

[0222] In the above scheme, by setting the first sub-component 1300 to contact the deformed first deformed part 14 and setting the third sub-component 1500 to contact the deformed second deformed part 16, the resistance value of the internal current circuit of the battery cell 10 can be increased, thereby reducing the current in the internal current circuit of the battery cell 10. This reduces the risk of the deformed part or the contact part between the deformed part and the conductive part melting due to excessive current, causing the deformed part to fail and preventing the battery cell 10 from short-circuiting and melting the internal electrical connection components, thus cutting off the charging and discharging circuit of the battery cell 10 and achieving overcharge protection. This effectively improves the reliability of the battery cell 10 under abuse conditions such as overcharging, thereby making the battery 100 highly reliable.

[0223] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall; A first conductive element is disposed on the outside of the first wall and is insulated from the first wall. The first conductive element includes a first sub-component and a second sub-component that are connected to each other. The second sub-component is used to connect to the busbar component. The first pole is connected to the second sub-component; A first deformable element, electrically connected to the first wall, is configured to deform to contact the first sub-component to electrically connect the first pole post to the first wall.

2. The battery cell according to claim 1, wherein, The resistivity of the first sub-component is greater than that of the second sub-component.

3. The battery cell according to claim 1 or 2, wherein, The first sub-component is made of stainless steel, and the second sub-component is made of aluminum.

4. The battery cell according to any one of claims 1-3, wherein, The resistance of the first sub-component is not less than 0.3 milliohms and not greater than 3 milliohms.

5. The battery cell according to any one of claims 1-4, wherein, The second sub-component has a first groove formed on the side facing the first wall, and at least a portion of the first sub-component is disposed in the first groove.

6. The battery cell according to claim 5, wherein, The inner circumferential surface of the first groove is formed with a first protrusion, and along the thickness direction of the first wall, a portion of the first sub-component is located on the side of the first protrusion away from the first wall.

7. The battery cell according to claim 6, wherein, The first protrusion is an annular structure extending circumferentially along the first groove.

8. The battery cell according to claim 6 or 7, wherein, The outer peripheral surface of the first sub-component is formed with a first flange, which is located on the side of the first protrusion away from the first wall along the thickness direction of the first wall.

9. The battery cell according to claim 8, wherein, The first flange is an annular structure extending circumferentially along the first groove.

10. The battery cell according to any one of claims 6-9, wherein, Along the direction pointing inwards from the battery cell, the first sub-component protrudes from the side of the second sub-component facing the first wall.

11. The battery cell according to any one of claims 5-10, wherein, The second sub-component has a second groove formed on the side facing the first wall, the first groove is disposed on the bottom surface of the second groove, and the side of the first protrusion facing the first wall is coplanar with the bottom surface of the second groove.

12. The battery cell according to any one of claims 1-11, wherein, Along the thickness direction of the first wall, the maximum dimension of the first sub-component is not less than 0.1 mm and not more than 5 mm.

13. The battery cell according to any one of claims 1-12, wherein, The battery cell also includes: The second conductive element is disposed on the outside of the first wall and is insulated from the first wall; The second electrode post is connected to the second conductive element; A second deformable element, electrically connected to the first wall, is configured to deform to contact the second conductive element to electrically connect the second pole to the first wall.

14. The battery cell according to claim 13, wherein, The second conductive element includes a third sub-component and a fourth sub-component connected to each other. The third sub-component is used to contact the second deformable element, and the fourth sub-component is used to connect to the busbar component. The second terminal post is connected to the fourth sub-component.

15. The battery cell according to claim 14, wherein, The resistivity of the third sub-component is greater than that of the fourth sub-component.

16. The battery cell according to any one of claims 13-15, wherein, The first pole and the second pole are spaced apart along a first direction. Along the first direction, the first deformable member is located on the side of the first pole away from the second pole, and / or the second deformable member is located on the side of the second pole away from the first pole.

17. A battery, wherein, Includes the battery cell described in any one of claims 1-16.

18. An energy storage device, wherein, Includes the battery cell described in any one of claims 1-16.

19. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-16, the battery cell being used to provide electrical energy.

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