Battery monomer, battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device. 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 part is arranged on the outer side of the first wall and insulated from the first wall, the first conductive part comprises a first sub-part and a second sub-part which are connected with each other, and the second sub-part is used for being connected with the confluence part. And the first pole is connected with the second sub-component. The first deformation member is electrically connected to the first wall, and the first deformation member is configured to be deformable to contact the first sub-component to electrically connect the first post to the first wall. According to the technical scheme, the reliability of the battery can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, how to improve the reliability of batteries is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] The present application provides a battery cell, a battery, an energy storage device, and an electrical device. The technical solution provided by the present application can improve the reliability of the battery.

[0005] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, a first conductive member, a first terminal, and a first deformation member. The housing has a first wall. The first conductive member is disposed outside the first wall and is insulated from the first wall. The first conductive member includes a first sub-component and a second sub-component connected to each other. The second sub-component is used to connect to a busbar component. The first terminal is connected to the second sub-component. The first deformation member is electrically connected to the first wall and is configured to be deformable to contact the first sub-component to electrically connect the first terminal to the first wall.

[0006] The electrical connection between the first deformation member and the first conductive member can cause a short circuit inside the battery cell, thereby realizing an overcharge protection function. In the above solution, by setting the first sub-component to contact the deformed first deformation member, the resistance value of the current loop inside the battery cell can be increased, so that the current in the current loop inside 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, enabling the first deformation member to effectively play an overcharge protection role, and thus effectively improving the reliability of the battery cell under overcharge and other abusive conditions, and further making the battery highly reliable.

[0007] According to some embodiments of the present application, the resistivity of the first sub-component is greater than the resistivity of the second sub-component.

[0008] In the above solution, by setting the resistivity of the first sub-component to be greater than that of the second sub-component, on the one hand, when the first deformable member contacts the first conductive member, the internal current loop of the battery cell can be effectively increased, reducing the risk that the first deformable member or the contact part between the first deformable member and the first conductive member melts due to a large current, resulting in damage to the structure and the failure of overcharge protection. On the other hand, by setting the first sub-component with a relatively large resistivity, the space occupied by the first sub-component can be reduced, improving the space utilization rate of the first conductive member, and thus facilitating the improvement of the volume energy density of the battery cell and the battery.

[0009] According to some embodiments of the present application, the material of the first sub-component is stainless steel, and the material of the second sub-component is aluminum.

[0010] In the above solution, 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 stainless steel via the first deformable member, reducing the current, and thus reducing the risk of overcharge protection failure caused by the first deformable member melting prior to the electrical connection components inside the battery cell. 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, facilitating the improvement of the volume energy density of the battery cell and the battery.

[0011] According to some embodiments of the present application, the resistance of the first sub-component is not less than 0.3 milliohms and not greater than 3 milliohms.

[0012] In the above solution, by setting the resistance of the first sub-component to be not less than 0.3 milliohms, when the first deformable 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 overcharge protection failure caused by the first deformable member or the contact between the first deformable member and the first sub-component melting due to a large current. By setting the resistance of the first sub-component to be not greater than 3 milliohms, when the first deformable member deforms and contacts the first sub-component, the current value of the internal current loop of the battery cell can be made to be of an appropriate magnitude to melt the electrical connection components inside the battery cell, thereby cutting off the charge and discharge loop 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 milliohms and not greater than 3 milliohms, the reliability of overcharge protection of the battery cell can be guaranteed to a certain extent, and thus the reliability of the battery can be effectively improved.

[0013] According to some embodiments of the present application, a first groove is formed on the side of the second sub-component facing the first wall, and at least a part of the first sub-component is disposed in the first groove.

[0014] In the above scheme, by setting the first groove on one side of the second sub-component, on the one hand, the first sub-component and the second sub-component can be connected to each other, so as to improve the reliability of overcharging protection of the battery cell; on the other hand, the space occupied by the first sub-component and the second sub-component can be reduced, so that the first conductive part has a compact structure, which is beneficial to the improvement of the volume energy density of the battery cell and the battery.

[0015] According to some embodiments of the present application, a first convex portion is formed on the inner circumferential surface of the first groove, and along the thickness direction of the first wall, a portion of the first subcomponent is located on a side of the first convex portion away from the first wall.

[0016] In the above scheme, by arranging the first convex portion on the inner circumferential surface of the first groove, the first convex portion can contact with the first sub-component, thereby restricting a part of the first sub-component within the first groove, reducing the risk of the first sub-component and the second sub-component being separated from each other, causing the overcharge protection of the battery cell to fail, thereby improving the reliability of the battery cell, and then improving the reliability of the battery.

[0017] According to some embodiments of the present application, the first protrusion is an annular structure extending along the circumference of the first groove.

[0018] In the above scheme, by setting the first protrusion as an annular structure, the first sub-component can be effectively contacted in the circumferential direction of the first groove, thereby effectively improving the structural stability between the first sub-component and the second sub-component, and reducing the risk of the first sub-component and the second sub-component being separated from each other, causing the overcharging protection of the battery cell to fail, thereby improving the reliability of the battery cell, and then improving the reliability of the battery.

[0019] According to some embodiments of the present application, a first flange is formed on the outer peripheral surface of the first subcomponent, and along the thickness direction of the first wall, the first flange is located on a side of the first protrusion away from the first wall.

[0020] In the above scheme, by setting the first flange to abut against the first convex portion, the first sub-component can be stably set in the first groove, thereby 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, causing the overcharging protection of the battery cell to fail, thereby improving the reliability of the battery cell, and then improving the reliability of the battery.

[0021] According to some embodiments of the present application, the first flange is an annular structure extending along the circumference of the first groove.

[0022] In the above solution, by setting the first flange as an annular structure, effective contact can be made with the first convex 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 separating from each other, resulting in the failure of overcharge protection of the battery cell, and thus improving the reliability of the battery cell and further improving the reliability of the battery.

[0023] According to some embodiments of the present application, along the direction pointing to the inside of the battery cell, the first sub-component protrudes from the side of the second sub-component facing the first wall.

[0024] In the above solution, by setting the first sub-component to protrude from the side of the second sub-component facing the first wall, it is beneficial for the first sub-component to contact the first deformable member, thereby improving the reliability of overcharge protection of the battery cell and further improving the reliability of the battery.

[0025] According to some embodiments of the present application, a second groove is formed on the side of the second sub-component facing the first wall, the first groove is provided on the bottom surface of the second groove, and the side of the first convex part facing the first wall is coplanar with the bottom surface of the second groove.

[0026] In the above solution, the part of the second sub-component facing the first wall surrounding the first sub-component can be stamped to form the first convex 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 separating from each other, resulting in the failure of overcharge protection of the battery cell, and thus improving the reliability of the battery cell and further improving the reliability of the battery. In some embodiments, by setting the second groove, the mass of the first conductive member can be reduced, which is beneficial to the mass energy density of the battery cell.

[0027] According to some embodiments of the present application, 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.

[0028] In the above solution, 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 made appropriate, which can effectively reduce the risk that the first deformable member or the contact part between the first deformable member and the first conductive member melts due to excessive current, resulting in the failure of the first deformable member and the inability to achieve internal short circuit of the battery cell to fuse the internal electrical connection member of the battery cell, thereby cutting off the charge and discharge circuit of the battery cell and realizing the risk of 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 can be improved, and the volume energy density of the battery cell is relatively high. 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 of the battery cell and the volume energy density can be taken into account.

[0029] According to some embodiments of the present application, the battery cell further includes a second conductive member, a second pole column, and a second deformable member. The second conductive member is disposed outside the first wall and is insulated from the first wall. The second pole column is connected to the second conductive member. The second deformable member is electrically connected to the first wall, and the second deformable member is configured to be deformable to contact the second conductive member to electrically connect the second pole column to the first wall.

[0030] In the above solution, by providing the second deformable member, when the internal pressure of the battery cell reaches a certain level, the second deformable member deforms to contact the second conductive member, so that the second pole column is electrically connected to the first wall. Cooperating with the contact between the first deformable member and the first conductive member, the internal electrical connection member of the battery cell is fused by the large current generated by the short circuit, so as to cut off the charge and discharge circuit of the battery cell, thereby playing a role in overcharge protection and reducing the risk of thermal runaway of the battery cell, and further making the battery have high reliability.

[0031] According to some embodiments of the present application, the second conductive member 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 member, the fourth sub-component is used to connect to the bus bar component, and the second pole column is connected to the fourth sub-component.

[0032] In the above solution, by providing the third sub-component to contact the deformed second deformable member, the resistance value of the internal current loop of the battery cell can be increased, so that the current in the internal current loop of the battery cell is reduced, thereby reducing the risk that the second deformable member or the contact part between the second deformable member and the second conductive member melts due to excessive current, resulting in the failure of the second deformable member and the inability to achieve internal short circuit of the battery cell to fuse the internal electrical connection member of the battery cell, thereby cutting off the charge and discharge circuit of the battery cell and realizing the risk of overcharge protection, thus effectively improving the reliability of the battery cell under abusive conditions such as overcharge, and further making the battery have high reliability.

[0033] According to some embodiments of the present application, the resistivity of the third subcomponent is greater than the resistivity of the fourth subcomponent.

[0034] 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, when the second deformable member contacts the second conductive member, the internal current loop of the battery cell can be effectively increased, thereby reducing the risk of the second deformable member or the contact part between the second deformable member and the second conductive member melting due to a large current, thereby damaging the structure and causing failure of the overcharging protection; on the other hand, by setting a 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 cell and the battery.

[0035] According to some embodiments of the present application, the first pole and the second pole are spaced apart along a first direction, and along the first direction, the first deformable member is located on a side of the first pole away from the second pole, and / or the second deformable member is located on a side of the second pole away from the first pole.

[0036] Compared with the case where the pole is located on the outside of the corresponding deformation member, in the above scheme, by locating 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 cell can be shortened, the internal resistance of the battery cell can be reduced, and the charging and discharging performance of the battery can be improved.

[0037] In a second aspect, some embodiments of the present application further provide a battery, the battery comprising the battery cell provided in the first aspect.

[0038] In a third aspect, some embodiments of the present application further provide an energy storage device, which includes the battery cell provided in the first aspect.

[0039] In a fourth aspect, some embodiments of the present application further provide an electrical device, the electrical device comprising the battery cell provided in the first aspect, the battery cell being used to provide electrical energy.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 Schematic diagram of a vehicle in some embodiments of the present application;

[0043] Figure 2 Schematic diagram of an energy storage device in some embodiments of the present application;

[0044] Figure 3 Exploded perspective view of a battery in some embodiments of the present application;

[0045] Figure 4 Exploded perspective view of a battery cell in some embodiments of the present application;

[0046] Figure 5 Exploded perspective view of a partial structure of a battery cell in some embodiments of the present application;

[0047] Figure 6 Internal schematic diagram of a partial structure of a battery cell in some embodiments of the present application;

[0048] Figure 7 Schematic diagram of a first electrode terminal, a first wall, and a first deformable member in some embodiments of the present application;

[0049] Figure 8 Schematic diagram of a first conductive member in some embodiments of the present application;

[0050] Figure 9 Schematic diagram of a flip piece in some embodiments of the present application;

[0051] Figure 10 Exploded perspective view of a first sub-component and a second sub-component in some embodiments of the present application;

[0052] Figure 11 Schematic diagram of a structure of a second sub-component in some embodiments of the present application;

[0053] Figure 12 Schematic diagram of a first sub-component in some embodiments of the present application;

[0054] Figure 13 Schematic diagram of a second electrode terminal, a first wall, and a second deformable member in some embodiments of the present application.

[0055] Icons: 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 member; 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 deformable member; 15 - second electrode terminal; 150 - second conductive member; 1500 - third sub - component; 1501 - fourth sub - component; 151 - second pole; 16 - second deformable member; 170 - first insulating member; 171 - second insulating member; 172 - third insulating member; 173 - fourth insulating member; 174 - fifth insulating member; 18 - flip - piece; 180 - skirt; 181 - flip - foil; 182 - electrical connection portion; 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 implementation mode

[0056] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0058] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0059] References to "embodiments" in this specification mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: there is A, there is both A and B, and there is B. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0061] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0063] 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, a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell can be in the shape of a cuboid or other shapes, and the embodiments of the present application also do not limit this. The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0064] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly operates by the movement (such as insertion and extraction) of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet 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 coated positive electrode active material layer protrudes from the positive electrode current collector with the coated positive electrode active material layer. The positive electrode current collector without the coated positive electrode active material layer serves as the 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 sheet 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 coated negative electrode active material layer protrudes from the negative electrode current collector with the coated negative electrode active material layer. The negative electrode current collector without the coated negative electrode active material layer serves as the 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. To ensure to a certain extent that a large current can pass through without fusing, 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 wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0065] The battery cell further includes a housing. The electrode assembly and the electrolyte are disposed inside the housing. The housing has a first wall, and the first wall is provided with electrode terminals. The electrode terminals are connected to the electrode assembly and are used for the input and output of electric energy. In some embodiments, the electrode terminals include a conductive member and a pole column that are connected to each other. The conductive member is located outside the first wall and is used to connect to an external busbar component to realize the input and output of electric energy. The pole column is directly or indirectly connected to the tab of the electrode assembly.

[0066] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0067] To reduce the risk of thermal runaway of the battery cell under abusive conditions such as overcharging, some current battery cells are provided with an overcharge protection structure. Exemplarily, the overcharge protection structure includes a deformable member, and the deformable member is electrically connected to the housing. Under abusive conditions such as overcharging, when the internal pressure of the battery cell increases to a certain extent, the deformable member deforms under the action of the internal pressure and can contact the electrode terminal, for example, connect to the conductive member, so that the housing is short-circuited with the electrode terminal, causing the positive and negative electrodes of the battery cell to be short-circuited, resulting in an internal short circuit of the battery cell. The electrical connection components inside the battery cell are melted by the large current generated by the short circuit, thereby cutting off the charge-discharge circuit of the battery cell and playing a role in overcharge protection.

[0068] However, the large current generated at the moment when the deformable member contacts the electrode terminal will cause the deformable member or the contact part between the deformable member and the electrode terminal to melt prior to the electrical connection member, forming an open circuit, resulting in the inability of the electrical connection member to fuse and cut off the charge and discharge circuit of the battery cell, leading to the failure of overcharge protection, affecting the reliability of the battery cell, and making the reliability of the battery low.

[0069] In view of this, to improve the problem that the deformable member or the contact part between the deformable member and the electrode terminal melts prior to the electrical connection member, forming an open circuit, resulting in the inability of the electrical connection member to fuse and cut off the charge and discharge circuit of the battery cell, leading to the failure of overcharge protection and affecting the reliability of the battery, some embodiments of the present application provide a battery cell. The battery cell includes a housing, a first conductive member, a first pole column, and a first deformable member. The housing has a first wall. The first conductive member is disposed outside the first wall and insulated from the first wall. The first conductive member includes a first sub-component and a second sub-component connected to each other, and the second sub-component is used to connect to a busbar component. The first pole column is connected to the second sub-component. The first deformable member is electrically connected to the first wall and is configured to be deformable to contact the first sub-component to electrically connect the first pole column to the first wall.

[0070] In the above solution, by providing the first sub-component to contact the deformed first deformable member, the resistance value of the current loop inside the battery cell can be increased, so that the current in the current loop inside the battery cell is reduced, thereby reducing the risk that the first deformable member or the contact part between the first deformable member and the first conductive member melts due to excessive current, enabling the first deformable member to effectively play the role of overcharge protection, thereby effectively improving the reliability of the battery cell under abusive conditions such as overcharge, and further making the reliability of the battery high.

[0071] The technical solutions described in the embodiments of the present application are applicable to batteries, energy storage devices using the batteries, and electrical devices using the batteries.

[0072] The energy storage device may include an energy storage container, an energy storage cabinet, etc. Exemplarily, the energy storage cabinet may include a cabinet body and one or more batteries disposed on the cabinet body.

[0073] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The electrical device in the embodiments of the present application includes but is not limited to those mentioned above.

[0074] For the convenience of description, the following embodiments will take the electrical device as a vehicle as an example for description.

[0075] Figure 1 It is a schematic diagram of a vehicle in some embodiments of the present application.

[0076] A controller 200, a motor 300, and a battery 100 can be arranged inside the vehicle 1000. 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 end, or the rear end 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 the operating power source of the vehicle 1000 and for the circuit system of the vehicle 1000, for example, for the working power requirements during the start, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] Please refer to Figure 2 , Figure 2 It is a schematic diagram of an energy storage device in some embodiments of the present application.

[0078] The energy storage device 2000 can include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 can be arranged inside the cabinet 2001. The plurality of batteries 100 can be connected in series, parallel, or in a mixed connection with each other.

[0079] Please refer to Figure 3 , Figure 3 It is a three-dimensional exploded view of the battery 100 in some embodiments of the present application.

[0080] The battery 100 includes battery cells 10 and a housing 30, and the battery cells 10 are accommodated in the housing 30. Among them, the housing 30 is used to provide an accommodation space for the battery cells 10, and the housing 30 can adopt various structures. In some embodiments, the housing 30 may include a first housing part 31 and a second housing part 32. The first housing part 31 and the second housing part 32 cover each other, and the first housing part 31 and the second housing part 32 jointly define an accommodation space for accommodating the battery cells 10. The second housing part 32 may be a hollow structure with one end open, and the first housing part 31 may be a plate-like structure. The first housing part 31 covers the open side of the second housing part 32 so that the first housing part 31 and the second housing part 32 jointly define an accommodation space; the first housing part 31 and the second housing part 32 may also both be hollow structures with one side open, and the open side of the first housing part 31 covers the open side of the second housing part 32. Of course, the housing 30 formed by the first housing part 31 and the second housing part 32 can be of various shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery 100, the number of battery cells 10 can be one or more, and each battery cell 10 can be fixed to the housing 30 through a connecting member (such as a bolt), or each battery cell 10 can be fixed to the housing 30 by bonding.

[0082] Some embodiments of the present application provide a battery cell 10. Please refer to Figures 4 - 8 , Figure 4 which is a three-dimensional exploded view of the battery cell 10 in some embodiments of the present application, Figure 5 which is a three-dimensional exploded view of the partial structure of the battery cell 10 in some embodiments of the present application, Figure 6 which is an internal schematic diagram of the partial structure of the battery cell 10 in some embodiments of the present application, Figure 7 which is a schematic diagram of the first electrode terminal 13, the first wall 110 and the first deformation member 14 in some embodiments of the present application, Figure 8 which is a schematic diagram of the first conductive member 130 in some embodiments of the present application.

[0083] 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 is insulated from the first wall 110. The first conductive member 130 includes a first sub-component 1300 and a second sub-component 1301 connected to each other. The second sub-component 1301 is used to connect with a busbar component. The first pole 131 is connected to the second sub-component 1301. The first deformation member 14 is electrically connected to the first wall 110, and the first deformation member 14 is configured to be deformable to contact the first sub-component 1300 to electrically connect the first pole 131 and the first wall 110.

[0084] The housing 11 is a component for accommodating the electrode assembly 12, and the housing 11 can also be used to accommodate an electrolyte, such as an electrolytic solution. Please refer to Figure 4 , in some embodiments, the housing 11 includes a housing body 111 and an end cap. An accommodation cavity is formed inside the housing body 111 for accommodating the electrode assembly 12. The housing body 111 has an opening communicating with the accommodation cavity. The end cap is covered on the opening of the housing body 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cap can be connected to the housing body 111 by welding, bonding, snap connection or other connection means. Optionally, the housing 11 may further include a bottom plate. Openings are respectively formed at both ends of the housing body 111, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate.

[0085] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal. For example, the housing 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy, etc.; or for another example, a part of the housing 11 can be made of metal, and the remaining part can be made of non-metal. For example, the end cap of the housing 11 can be made of metal, and the housing body 111 or other parts of the housing 11 can be made of non-metallic materials.

[0086] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed into the housing body 111, and the electrolytic solution can be filled into the housing body 111, and then the end cap is covered on the opening of the housing body 111 to complete the assembly of the battery cell 10. Or, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed into the housing body 111, then the end cap is covered on the opening of the housing body 111, and the electrolytic solution is filled into the housing body 111 through the liquid injection hole on the end cap, and then the liquid injection hole is sealed to complete the assembly of the battery cell 10.

[0087] The housing 11 can be of various shapes, such as a cylindrical body or a prismatic structure, etc. The shape of the housing 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, the housing 11 of a cylindrical structure can be selected. If the electrode assembly 12 is a flat structure, the housing 11 can be square.

[0088] The first wall 110 is a partial structure of the housing 11. The first wall 110 can be used to carry and support the first electrode terminal 13, so that the first electrode terminal 13 is in a stable state to realize the input and output of electric energy. In some embodiments, the first wall 110 can be a part of the housing body 111, such as the side wall or the bottom wall of the housing body 111. In some embodiments, the first wall 110 can be the end cap.

[0089] The first electrode terminal 13 is a component mounted on the first wall 110. The first electrode terminal 13 is used for electrically connecting with the electrode assembly 12, so that current flows 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 made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 13 can be connected to the first tab 120 through the first adapter 121. Exemplarily, the first tab 120 of the electrode assembly 12 is composed of a plurality of first sub-tabs stacked. After one end of the first adapter 121 is welded to the first tab 120, the other end of the first adapter 121 can be welded to the first electrode terminal 13.

[0090] In some embodiments, the first electrode terminal 13 includes a first conductive member 130 and a first pole column 131. The first conductive member 130 is located on the side of the first wall 110 facing away from the electrode assembly 12, and the first conductive member 130 is used for connecting with an external busbar component (such as a busbar). Exemplarily, the first conductive member 130 is welded to the busbar component. The first pole column 131 is connected to the first tab 120 of the electrode assembly 12. Exemplarily, the first pole column 131 is connected to the first tab 120 through the first adapter 121. The first conductive member 130 and the first pole column 131 are connected to each other. The connection relationship between the first conductive member 130 and the first pole column 131 includes welding, riveting, connection with threaded parts or integral molding, etc. Exemplarily, in some embodiments, the first conductive member 130 and the first pole column 131 are riveted to each other. The first conductive member 130 is generally plate-shaped and is formed with a riveting hole. The first pole column 131 is generally column-shaped, such as cylindrical or polygonal column-shaped, etc. A part of the first pole column 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 inside the housing 11 and is connected to the first tab 120 through the first adapter 121.

[0091] In some embodiments, a first insulating member 170 is provided between the first conductive member 130 and the first wall 110. The first insulating member 170 is used for insulating and isolating the first conductive member 130 from the first wall 110. A second insulating member 171 is provided between the first pole column 131 and the first wall 110. For example, a second insulating member 171 is provided between the outer periphery of the first pole column 131 and the hole wall of the first through hole 1100.

[0092] In some embodiments, the first insulating member 170 and / or the second insulating member 171 may 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. Exemplarily, in some embodiments of the present application, the material of the first insulating member 170 and / or the second insulating member 171 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the first insulating member 170 and / or the second insulating member 171 may also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0093] In some embodiments, the resistance value of the first insulating member 170 and / or the second insulating member 171 may be in units of megohms (MΩ). Exemplarily, in the battery cell 10 provided in some embodiments of the present application, the resistance value of the first insulating member 170 and / or the second insulating member 171 may be greater than or equal to 200 MΩ.

[0094] The first deformation member 14 is mounted on the first wall 110, and the first deformation member 14 is electrically connected to the first wall 110. In some embodiments, the first deformation member 14 may be made of a metal material. For example, the first deformation member 14 is made of aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal. In some embodiments, the first deformation member 14 may be welded to the inner side surface of the first wall 110.

[0095] The first deformation member 14 is a structural member 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. Exemplarily, when the battery cell 10 is in an abusive condition such as overcharge, the internal pressure increases. When the internal pressure reaches a certain level, for example, a first threshold, the first deformation member 14 deforms to contact the first electrode terminal 13, thereby conducting the first wall 110 and the first electrode terminal 13, causing the positive and negative electrodes inside the battery cell 10 to be short-circuited.

[0096] In some embodiments, the first deformation member 14 may be a flipping piece 18, and the flipping piece 18 flips under the action of pressure. Exemplarily, please refer to Figure 9 , Figure 9 is a schematic diagram of the flipping piece 18 in some embodiments of the present application. The outer contour of the flipping piece 18 is disc-shaped and includes a skirt 180, a flipping foil 181, and an electrical connection portion 182 connected in sequence from outside to inside. The skirt 180 may be connected to the first wall 110. The thickness of the flipping foil 181 is relatively thin and is used to deform and flip under pressure. After the flipping foil 181 flips, it can push the electrical connection portion 182 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.

[0097] Exemplarily, the first wall 110 has a second through-hole 1101, and the skirt 180 of the first deformable member 14 is welded to the first wall 110, so that the first deformable member 14 closes the second through-hole 1101. The flip foil 181 is in a state of collapsing in a direction away from the first wall 110 in the natural state. When the internal pressure of the battery cell 10 reaches the first threshold, the flip foil 181 flips in a direction facing the first wall 110 to push the electrical connection portion 182, so that the electrical connection portion 182 passes through the second through-hole 1101 and contacts the first conductive member 130.

[0098] In some embodiments, the first pole 131 is electrically connected to the first tab 120 through the first adapter 121. The second tab 122 of the electrode assembly 12 can be electrically connected to the housing 11. The second tab 122 and the first tab 120 have opposite polarities. The second tab 122 is directly or through the second adapter 123 connected to the housing 11, or a second electrode terminal 15 is provided on the housing 11. The second electrode terminal 15 is electrically connected to the housing 11, and the second tab 122 is 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, the first deformable member 14 deforms to short-circuit the first electrode terminal 13 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. The large current generated instantaneously can melt the electrical connection components inside the battery cell 10 and cut off the charging and discharging circuit of the battery cell 10, thereby playing a role in overcharge protection. The melted electrical connection components may include the first adapter 121 and / or the second adapter 123. Exemplarily, the first adapter 121 has a first fusing portion, and the thickness or width dimension of the first fusing portion can be smaller than the thickness or width dimension of the rest of the first adapter 121, so that when a relatively large current passes through, the first fusing portion can be melted to disconnect the current path between the first tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 123 has a second fusing portion, so that when a relatively large current passes through, the second fusing portion can be melted to disconnect the current path between the second tab 122 and the second electrode terminal 15 or the housing 11.

[0099] In some other embodiments, the first electrode terminal 13 is electrically connected to the first tab 120 through the 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 and the first tab 120 have opposite polarities. The second electrode terminal 15 can be insulatingly mounted on the housing 11, for example, insulatingly mounted on the first wall 110 of the housing 11. The second tab 122 can be electrically connected to the second electrode terminal 15 through the second adapter 123. The second electrode terminal 15 is correspondingly provided with a second deformation member 16. The second deformation member 16 is electrically connected to the housing 11. The second deformation member 16 is configured to deform to 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.

[0100] When the internal pressure of the battery cell 10 reaches a certain level, such as a first threshold, the first deformation member 14 deforms to contact the first conductive member 130, short-circuiting the first electrode terminal 13 and the housing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformation member 16 deforms to short-circuit the second electrode terminal 15 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. The instantaneously generated large current can fuse the electrical connection components inside the battery cell 10, cutting off the charge and discharge circuit of the battery cell 10, thereby playing a role in overcharge protection. The fused electrical connection components can include the first adapter 121 and / or the second adapter 123. Exemplarily, the first adapter 121 has a first fusing portion. When a relatively large current passes through, the first fusing portion can be fused, thereby disconnecting the current path between the first tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 123 has a second fusing portion. When a relatively large current passes through, the second fusing portion can be fused, thereby disconnecting the current path between the second tab 122 and the second electrode terminal 15.

[0101] In some embodiments, the first conductive member 130 includes a first sub-component 1300 and a second sub-component 1301 that are connected to each other. The first sub-component 1300 and the second sub-component 1301 are 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 a metal material or other conductive materials respectively, for example, made of aluminum, aluminum alloy, stainless steel, copper, etc.

[0102] The manufacturing materials of the first sub-component 1300 and the second sub-component 1301 can be the same or different. Exemplarily, both the first sub-component 1300 and the second sub-component 1301 are made of aluminum; or, the first sub-component 1300 is made of stainless steel and the second sub-component 1301 is made of aluminum.

[0103] The first sub-component 1300 is used to contact the first deformable member 14, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. The large current generated instantaneously can fuse the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby playing a role in overcharge protection.

[0104] The second sub-component 1301 is used to connect with the bus bar component. Exemplarily, in some embodiments, the current in the charging and discharging circuit of the battery cell 10 can flow through the first tab 120, the first adapter 121, the first terminal 131, and the second sub-component 1301 to the bus bar component. Exemplarily, in some embodiments, when the internal pressure of the battery cell 10 reaches a certain level, the first deformable member 14 deforms, and the current can flow through the first tab 120, the first adapter 121, the first terminal 131, the second sub-component 1301 to the first wall 110.

[0105] In some embodiments, the first sub-component 1300 can be a component disposed on the side of the second sub-component 1301 facing the first wall 110. For example, the first sub-component 1300 is welded to the inner side of the second sub-component 1301. In some embodiments, a groove is formed on the inner side of the second sub-component 1301, and the first sub-component 1300 can be partially disposed in the groove.

[0106] The first deformable member 14 is electrically connected to the first conductive member 130, which can cause an internal short circuit inside the battery cell 10, thereby realizing the overcharge protection function. In the above solution, by arranging the first sub-component 1300 to contact the deformed first deformable member 14, the resistance value of the internal current loop of the battery cell 10 can be increased, so that the current in the internal current loop of the battery cell 10 decreases, thereby reducing the melting of the first deformable member 14 or the contact part between the first deformable member 14 and the first conductive member 130 due to excessive current, resulting in the failure of the first deformable member 14 and the inability to achieve an internal short circuit of the battery cell 10 to fuse the electrical connection components inside the battery cell 10, thereby cutting off the charging and discharging circuit of the battery cell 10 and realizing the risk of overcharge protection, thereby effectively improving the reliability of the battery cell 10 under abusive conditions such as overcharge, and further making the battery 100 highly reliable.

[0107] 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.

[0108] Resistivity is a physical quantity that describes the resistance of a material to the flow of current. Resistivity affects the resistance of a material, and resistance is the product of resistivity, the length, and the cross-sectional area of the material. In some embodiments, the measurement methods of resistivity can include direct measurement method, four-probe method, volume resistivity measurement, or measurement according to the standard of GB / T 351-2019 "Measurement Method of Resistivity of Metallic Materials".

[0109] In some embodiments, the resistivity of the first sub-component 1300 can be greater than that of the second sub-component 1301, so that when the first deformable member 14 contacts the first conductive member 130, the resistance value in the current loop can be effectively increased. Exemplarily, when the second sub-component 1301 is made of aluminum, the first sub-component 1300 can be made of a material with a relatively large resistivity such as stainless steel.

[0110] In some embodiments, the relatively large resistivity of the first sub-component 1300 can enable the volume of the first sub-component 1300 to be set smaller to reasonably utilize the space. Exemplarily, by grooving the inner side of the second sub-component 1301 and arranging the first sub-component 1300 in the groove, the influence on the volume of the first conductive member 130 caused by arranging the first sub-component 1300 can be reduced.

[0111] In the above solution, by setting the resistivity of the first sub-component 1300 to be greater than that of the second sub-component 1301, on the one hand, when the first deformable member 14 contacts the first conductive member 130, the internal current loop of the battery cell 10 can be effectively increased, and the risk that the first deformable member 14 or the contact part between the first deformable member 14 and the first conductive member 130 is melted due to a large current, resulting in structural damage and overcharge protection failure, can be reduced; on the other hand, by arranging the first sub-component 1300 with a relatively large resistivity, 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 thus the volumetric energy density of the battery cell 10 and the battery 100 can be facilitated to increase.

[0112] In some other embodiments, the resistivity of the first sub-component 1300 can be equal to that of the second sub-component 1301. In this case, the volume of the first sub-component 1300 can be set larger. In some other embodiments, the resistivity of the first sub-component 1300 can be less than that of the second sub-component 1301. In this case, the volume of the first sub-component 1300 can be set even larger.

[0113] According to some embodiments of the present application, the material of the first sub-component 1300 is stainless steel, and the material of the second sub-component 1301 is aluminum.

[0114] In some embodiments, the resistivity of the first sub-component 1300 can be greater than that of the second sub-component 1301. For example, the material of the first sub-component 1300 is stainless steel, and the material of the second sub-component 1301 is aluminum. In some embodiments, the first sub-component 1300 and the second sub-component 1301 can be connected by riveting, clamping or threaded members.

[0115] In the above scheme, by setting the material of the first subcomponent 1300 to stainless steel and the material of the second subcomponent 1301 to aluminum, on the one hand, the internal current loop of the battery cell 10 passes through the stainless steel through the first deformable member 14, so that the current is reduced, reducing the risk of the first deformable member 14 melting before the electrical connection components inside the battery cell 10, thereby causing the overcharge protection to fail. On the other hand, because the resistivity of stainless steel is greater than that of aluminum, the space occupied by the first subcomponent 1300 can be effectively reduced, which is conducive to the improvement of the volume energy density of the battery cell 10 and the battery 100.

[0116] According to some embodiments of the present application, the resistance of the first subcomponent 1300 is not less than 0.3 milliohms and not more than 3 milliohms.

[0117] In some embodiments, the resistance value of the first subcomponent 1300 may be not less than 0.3 milliohms and not more than 3 milliohms, so that when the first deformable member 14 contacts the first conductive member 130, the resistance value in the current loop increases by not less than 0.3 milliohms and not more than 3 milliohms.

[0118] Exemplarily, the resistance value of the first subcomponent 1300 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.

[0119] In some embodiments, the value of the resistance of the first subcomponent 1300 can be measured by using a multimeter, a voltammetry method, a four-probe method, a Wheatstone bridge method, or the like.

[0120] In the above scheme, by setting the resistance of the first subcomponent 1300 to be not less than 0.3 milliohms, when the first deformable member 14 is deformed and contacts the first subcomponent 1300, the current value of the internal current loop of the battery cell 10 can be effectively reduced, thereby reducing the risk of failure of overcharge protection due to melting of the first deformable member 14 or between the first deformable member 14 and the first subcomponent 1300 due to a large current. By setting the resistance of the first subcomponent 1300 to be not more than 3 milliohms, when the first deformable member 14 is deformed and contacts the first subcomponent 1300, the current value of the internal current loop of the battery cell 10 can be at an appropriate size to melt the electrical connection components inside the battery cell 10, thereby cutting off the charge and discharge circuit of the battery cell 10 to achieve overcharge protection. To this end, by setting the resistance of the first subcomponent 1300 to be not less than 0.3 milliohms and not more than 3 milliohms, the reliability of the overcharge protection of the battery cell 10 can be guaranteed to a certain extent, thereby effectively improving the reliability of the battery 100.

[0121] According to some embodiments of this application, seeFigures 10 - 12 , Figure 10 is an exploded perspective view of a first sub-component 1300 and a second sub-component 1301 in some embodiments of the present application. Figure 11 is a schematic structural view of the second sub-component 1301 in some embodiments of the present application. Figure 12 is a schematic view of the first sub-component 1300 in some embodiments of the present application. A first groove 13010 is formed on a side of the second sub-component 1301 facing the first wall 110, and at least a part of the first sub-component 1300 is disposed in the first groove 13010.

[0122] 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.

[0123] The first groove 13010 can be a groove structure formed on the inner side or inner surface of the second sub-component 1301, and the first groove 13010 can be formed by processes such as grooving and integral molding. In some embodiments, the shape of the first groove 13010 is generally circular, and in some other embodiments, the shape of the first groove 13010 can be square, triangular, oval or other shapes.

[0124] "At least a part of the first sub-component 1300 is disposed in the first groove 13010" can be understood as that the entire first sub-component 1300 is disposed in the first groove 13010, or a part of the first sub-component 1300 is disposed in the first groove 13010, and another part of the first sub-component 1300 is located outside the first groove 13010.

[0125] In some embodiments, the first sub-component 1300 can be connected to the bottom wall and / or the peripheral wall of the first groove 13010 by connection methods such as welding, soldering, clamping, riveting or threading.

[0126] In some embodiments, the second sub-component 1301 is formed with a riveting hole 13013 for riveting with the first pole 131.

[0127] In the above solution, by providing the first groove 13010 on one side of the second sub-component 1301, on the one hand, the mutual connection between the first sub-component 1300 and the second sub-component 1301 can be realized, so as to improve the reliability of overcharge protection of the battery cell 10; on the other hand, the space occupied by the first sub-component 1300 and the second sub-component 1301 can be reduced, making the first conductive member 130 compact, which is beneficial to the improvement of the volume energy density of the battery cell 10 and the battery 100.

[0128] According to some embodiments of the present application, please refer to Figure 8and Figure 11 On the inner circumferential surface of the first groove 13010, a first protrusion 13011 is formed. Along the thickness direction z of the first wall, a part of the first sub-component 1300 is located on the side of the first protrusion 13011 away from the first wall 110.

[0129] The first protrusion 13011 is a component provided on the inner circumferential surface of the first groove 13010. The first protrusion 13011 can contact the first sub-component 1300 to prevent the first sub-component 1300 from detaching from the second sub-component 1301. Exemplarily, the first groove 13010 is a circular groove. Along the radial direction of the first groove 13010, the first protrusion 13011 protrudes from the inner circumferential surface of the first groove 13010, reducing the notch size of the first groove 13010 so that a part of the first sub-component 1300 can be located between the first protrusion 13011 and the bottom wall of the first groove 13010.

[0130] In some embodiments, the first protrusion 13011 can be provided on the inner circumferential surface of the first groove 13010 by means such as bonding, welding, snap connection, or connection with threaded parts. In some embodiments, the second sub-component 1301 can be subjected to extrusion, stamping, etc. to form the first protrusion 13011. In some embodiments, the first groove 13010 and the first protrusion 13011 can be formed by an integral molding method such as casting.

[0131] In some embodiments, a flange or a groove can be formed on the outer circumferential surface of the first sub-component 1300. The first protrusion 13011 abuts against the flange or the first protrusion 13011 is disposed in the groove to restrict the movement of the first sub-component 1300 along the thickness direction z of the first wall. In other embodiments, the entire first sub-component 1300 is located in the first groove 13010, and the first protrusion 13011 can contact the side of the first sub-component 1300 facing the inside of the battery cell 10.

[0132] In some embodiments, the first protrusion 13011 can be located in the middle of the inner circumferential surface of the first groove 13010, dividing the first groove 13010 into two parts. In some embodiments, the first protrusion 13011 can be adjacent to the notch of the first groove 13010.

[0133] "A part of the first sub-component 1300 is located on the side of the first convex portion 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, a part of the first sub-component 1300 is located between the first convex portion 13011 and the bottom wall of the first groove 13010, and another part is located on the side of the first convex portion 13011 away from the first wall 110. Exemplarily, the first convex portion 13011 may be disposed adjacent to the notch of the first groove 13010, a part of the first sub-component 1300 is located in the first groove 13010, and another part of the first sub-component 1300 protrudes from the first convex portion 13011 in the thickness direction z of the first wall and is located outside the first groove 13010.

[0134] In some embodiments, the first sub-component 1300 may protrude from the side of the second sub-component 1301 facing the first wall 110.

[0135] In the above solution, by providing the first convex portion 13011 on the inner circumferential surface of the first groove 13010, the first convex portion 13011 can be in contact with the first sub-component 1300, so as to limit a part 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, resulting in the failure of the overcharge protection of the battery cell 10, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0136] According to some embodiments of the present application, the first convex portion 13011 is an annular structure extending along the circumferential direction of the first groove 13010.

[0137] In some embodiments, the first convex portion 13011 is an annular structure with its head and tail connected, and the first convex portion 13011 is disposed on the inner circumferential surface of the first groove 13010 and can surround one week.

[0138] In the above solution, by setting the first convex portion 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, resulting in the failure of the overcharge protection of the battery cell 10, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0139] In some other embodiments, the first convex portion 13011 may be in structures such as a block shape or a tooth shape. When the first convex portion 13011 may be in structures such as a block shape or a tooth shape, a plurality of first convex portions 13011 may be distributed at intervals along the circumferential direction of the first groove 13010.

[0140] According to some embodiments of the present application, please refer to Figure 8 and Figure 12 , a first flange 13000 is formed on the outer peripheral surface of the first sub-component 1300. Along the thickness direction z of the first wall, the first flange 13000 is located on the side of the first convex portion 13011 away from the first wall 110.

[0141] The first flange 13000 is a protruding structure formed on the outer peripheral surface of the first sub-component 1300. In some embodiments, the first flange 13000 can cooperate with the first convex portion 13011. The first flange 13000 is located on the side of the first convex portion 13011 away from the first wall 110. The first flange 13000 and the first convex portion 13011 are in mutual abutment in the thickness direction z of the first wall.

[0142] In some embodiments, the first flange 13000 can be arranged on the outer peripheral surface of the main body of the first sub-component 1300 by means of bonding, welding, snap connection or threaded member connection, etc. In some embodiments, the first sub-component 1300 can be subjected to extrusion, stamping or other means to form the first flange 13000. In some embodiments, the first sub-component 1300 and the first flange 13000 can be formed by integral molding such as casting.

[0143] Exemplarily, the main body of the first sub-component 1300 is cylindrical. A first flange 13000 is formed at one end of the first sub-component 1300. 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 the radial dimensions of other parts. Please refer to Figure 8 , the outer peripheral surface of the first flange 13000 can include an inclined surface, a straight surface and an inclined surface. The straight surface is located between the two inclined surfaces, and the two inclined surfaces are respectively connected to the main body of the first sub-component 1300 in a transitional manner.

[0144] Exemplarily, 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 convex portion 13011 away from the first wall 110.

[0145] In the above solution, by arranging the first flange 13000 to abut against the first convex portion 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, resulting in the failure of the overcharge protection of the battery cell 10, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0146] According to some embodiments of the present application, the first flange 13000 is an annular structure extending circumferentially along the first groove 13010.

[0147] In some embodiments, the first flange 13000 is an annular structure with its head and tail connected. The first flange 13000 is disposed on the outer peripheral surface of the main body of the first sub-component 1300 and can surround one week.

[0148] In the above solution, by setting the first flange 13000 as an annular structure, it can effectively contact the first convex portion 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 that the first sub-component 1300 and the second sub-component 1301 are separated from each other, resulting in the failure of the overcharge protection of the battery cell 10, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0149] According to some embodiments of the present application, along the direction pointing to the inside of the battery cell 10, the first sub-component 1300 protrudes from the side of the second sub-component 1301 facing the first wall.

[0150] In some embodiments, along the direction pointing to the inside of the battery cell 10, the first sub-component 1300 can protrude beyond the inner side surface of the second sub-component 1301.

[0151] In the above solution, by setting the first sub-component 1300 to protrude from the side of the second sub-component 1301 facing the first wall 110, it is beneficial for the first sub-component 1300 to contact the first deformation member 14, thereby improving the reliability of the overcharge protection of the battery cell 10, and further improving the reliability of the battery 100.

[0152] According to some embodiments of the present application, please refer to Figure 8 and Figure 11 , a second groove 13012 is formed on the side of the second sub-component 1301 facing the first wall 110. The first groove 13010 is disposed on the groove bottom surface of the second groove 13012. The side of the first convex portion 13011 facing the first wall 110 is coplanar with the groove bottom surface of the second groove 13012.

[0153] 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. 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.

[0154] In some embodiments, the radial dimension of the first groove 13010 is smaller than the radial dimension of the second groove 13012.

[0155] In some embodiments, the first flange 13000 is formed by stamping or extrusion. For example, the inner side surface 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 surface of the second sub-component 1301 is stamped or extruded, so that the inner side surface of the second sub-component 1301 is locally deformed to form a first convex portion 13011 that abuts against the first sub-component 1300, and a second groove 13012 is formed.

[0156] In the above solution, the portion 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 convex portion 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 that the first sub-component 1300 and the second sub-component 1301 are separated from each other, resulting in the failure of the overcharge protection of the battery cell 10, thereby improving the reliability of the battery cell 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, which is beneficial to the mass energy density of the battery cell 10.

[0157] According to some embodiments of the present application, along the thickness direction z of the first wall, the maximum dimension of the first sub-component 1300 is not less than 0.1 mm and not more than 5 mm.

[0158] In some embodiments, referring to Figure 12 , along the thickness direction z of the first wall, the maximum dimension of the first sub-component 1300 is H, and the value of H can be not less than 0.1 mm and not more than 5 mm. Exemplarily, along the thickness direction z of the first wall, the maximum dimension H of the first sub-component 1300 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.

[0159] In the above solution, 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 made appropriate, which can effectively reduce the melting of the contact part between the first deformable member 14 or between the first deformable member 14 and the first conductive member 130 due to excessive current, resulting in the failure of the first deformable member 14 and the inability to achieve an internal short circuit of the battery cell 10 to fuse the internal electrical connection member of the battery cell 10, thereby cutting off the charging and discharging circuit of the battery cell 10 and realizing the risk of 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 greater 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 cell 10 can be made relatively high. 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 greater than 5 mm, the reliability of overcharge protection of the battery cell 10 and the volume energy density can be taken into account.

[0160] According to some embodiments of the present application, please refer to Figure 13 , Figure 13 which is a schematic diagram of the second electrode terminal 15, the first wall 110 and the second deformable member 16 in some embodiments of the present application. The battery cell 10 further includes a second conductive member 150, a second pole column 151 and a second deformable member 16. The second conductive member 150 is disposed outside the first wall 110 and is insulated from the first wall 110. The second pole column 151 is connected to the second conductive member 150. The second deformable member 16 is electrically connected to the first wall 110, and the second deformable member 16 is configured to be deformable to contact the second conductive member 150 to electrically connect the second pole column 151 to the first wall 110.

[0161] In some embodiments, the battery cell 10 further includes a second electrode terminal 15, and the second electrode terminal 15 is electrically connected to the second tab 122 of the electrode assembly 12 for connection to an external bus bar component. The polarity of the second electrode terminal 15 is opposite to that of the first electrode terminal 13. For example, if the first electrode terminal 13 is a positive electrode terminal, the second electrode terminal 15 is a negative electrode terminal. The second electrode terminal 15 is used to electrically connect to the electrode assembly 12 to allow current to 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 a metal material, such as made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second electrode terminal 15 can be connected to the second tab 122 through a second adapter 123. Exemplarily, the second tab 122 of the electrode assembly 12 is formed by laminating a plurality of second sub-tabs, and one end of the second adapter 123 can be welded to the second tab 122 and then the other end of the second adapter 123 can be welded to the second electrode terminal 15.

[0162] In some embodiments, the second electrode terminal 15 includes a second conductive member 150 and a second pole 151. The second conductive member 150 is located on the side of the first wall 110 away from the electrode assembly 12, and the second conductive member 150 is used to connect to an external busbar component (e.g., a bar). Exemplarily, the second conductive member 150 is welded to the busbar component. The second pole 151 is connected to the second pole ear 122 of the electrode assembly 12, and exemplarily, the second pole 151 is connected to the second pole ear 122 via a second adapter 123. The second conductive member 150 and the second pole 151 are connected to each other, and the connection relationship between the second conductive member 150 and the second pole 151 includes welding, riveting, screw connection, or integral molding, etc. Exemplarily, in some embodiments, the second conductive member 150 and the second pole 151 are riveted to each other, the second conductive member 150 is generally plate-shaped, the second conductive member 150 is formed with a rivet hole, the second pole 151 is generally columnar, such as a cylindrical or polygonal column, etc., a portion of the second pole 151 passes through the third through hole 1102 of the first wall 110 and is riveted in the rivet hole, and the other portion is located in the outer shell 11 and is connected to the second pole ear 122 through the second adapter 123.

[0163] In some embodiments, a third insulating member 172 is disposed between the second conductive member 150 and the first wall 110, and the third insulating member 172 is used to insulate and isolate the second conductive member 150 from the first wall 110. A fourth insulating member 173 is disposed between the second pole 151 and the first wall 110, for example, a fourth insulating member 173 is disposed between the outer periphery of the second pole 151 and the hole wall of the third through hole 1102.

[0164] In some embodiments, the third insulating member 172 and / or the fourth insulating member 173 may be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. For example, in some embodiments of the present application, the material of the third insulating member 172 and / or the fourth insulating member 173 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the third insulating member 172 and / or the fourth insulating member 173 may also be made of other materials with insulating properties such as polypropylene and polyethylene.

[0165] In some embodiments, the resistance value of the third insulating member 172 and / or the fourth insulating member 173 may be in megaohms (MΩ). For example, in some embodiments of the present application, the resistance value of the first insulating member 170 and / or the second insulating member 171 of the battery cell 10 may be greater than or equal to 200 MΩ.

[0166] The second deformation member 16 is installed on the first wall 110, and the second deformation member 16 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.

[0167] The second deformation member 16 is a structural 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. Exemplarily, when the battery cell 10 is in an abusive condition such as overcharge, the internal pressure increases. 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 conducting the first wall 110 and the second electrode terminal 15, and short-circuiting the positive and negative electrodes inside the battery cell 10.

[0168] In some embodiments, the second deformation member 16 can be a flip piece 18, and the flip piece 18 flips under the action of pressure. Exemplarily, 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 state of collapsing in a direction away from the first wall 110 in the natural state. When the internal pressure of the battery cell 10 reaches the first threshold, the flip foil 181 flips towards the direction facing the first wall 110 to push the electrical connection portion 182, so that the electrical connection portion 182 passes through the fourth through hole 1103 to contact the second conductive member 150.

[0169] In some embodiments, the first threshold and the second threshold can be equal or unequal.

[0170] In some embodiments, when the battery cell 10 is in an abusive condition due to overcharge or the like, the internal pressure of the battery cell 10 increases. 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. 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, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cut off the charge and discharge circuit of the battery cell 10, and thus play a role in overcharge protection. The melted electrical connection components can include the first adapter 121 and / or the second adapter 123. Exemplarily, the first adapter 121 has a first fusing portion, and when a relatively large current passes through, the first fusing portion can be melted to disconnect the current path between the first tab 120 and the first electrode terminal 13.

[0171] In the above solution, by providing the second deformable member 16, when the internal pressure of the battery cell 10 reaches a certain level, the second deformable member 16 deforms to contact the second conductive member 150, so that the second terminal 151 is electrically connected to the first wall 110. In cooperation with the contact between the first deformable member 14 and the first conductive member 130, the electrical connection member inside the battery cell 10 is melted by the large current generated by the short circuit, so as to cut off the charge and discharge circuit of the battery cell 10, thereby playing a role in overcharge protection and reducing the risk of thermal runaway of the battery cell 10, and further making the battery 100 have high reliability.

[0172] According to some embodiments of the present application, please refer to Figure 13 , the second conductive member 150 includes a third sub-component 1500 and a fourth sub-component 1501 that are connected to each other. 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, and the second terminal 151 is connected to the fourth sub-component 1501.

[0173] The second conductive member 150 includes a third sub-component 1500 and a fourth sub-component 1501 that are connected to each other. The third sub-component 1500 and the fourth sub-component 1501 are connected to each other. Both the third sub-component 1500 and the fourth sub-component 1501 have conductive characteristics, and the third sub-component 1500 and the fourth sub-component 1501 can be made of metal materials or other conductive materials respectively, for example, made of aluminum, aluminum alloy, stainless steel, copper, etc.

[0174] The manufacturing materials of the third sub-component 1500 and the fourth sub-component 1501 can be the same or different. Exemplarily, both the third sub-component 1500 and the fourth sub-component 1501 are made of aluminum; or, the third sub-component 1500 is made of stainless steel and the fourth sub-component 1501 is made of aluminum.

[0175] 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 charge and discharge 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, the fourth sub-component 1501 to the first wall 110.

[0176] 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 is 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.

[0177] In the above solution, by providing the third sub-component 1500 to contact the deformed second deformable member 16, the resistance value of the current loop inside the battery cell 10 can be increased, so that the current in the current loop inside the battery cell 10 is reduced, thereby reducing the risk that the second deformable member 16 or the contact portion between the second deformable member 16 and the second conductive member 150 is melted due to excessive current, resulting in the failure of the second deformable member 16 and the inability to achieve an internal short circuit of the battery cell 10 to fuse the internal electrical connection member of the battery cell 10, thereby cutting off the charge and discharge loop of the battery cell 10 and realizing overcharge protection. Thus, the reliability of the battery cell 10 under abusive conditions such as overcharge is effectively improved, and further the reliability of the battery 100 is high.

[0178] In other embodiments, the second conductive member 150 may not be provided with the third sub-component 1500. For example, the second conductive member 150 includes a fourth sub-component 1501, and the fourth sub-component 1501 may be an aluminum structure for connecting to the busbar component.

[0179] According to some embodiments of the present application, the resistivity of the third sub-component 1500 is greater than the resistivity of the fourth sub-component 1501.

[0180] In some embodiments, the resistivity of the third sub-component 1500 may be greater than the resistivity of the fourth sub-component 1501 to effectively increase the resistance value in the current loop when the first deformable member 14 contacts the first conductive member 130. Exemplarily, when the fourth sub-component 1501 is made of aluminum, the third sub-component 1500 may be made of a material with a relatively large resistivity such as stainless steel.

[0181] In some embodiments, since the resistivity of the third sub-component 1500 is relatively large, the volume of the third sub-component 1500 can be set to be relatively small to reasonably utilize the space. Exemplarily, by grooving the inner side of the fourth sub-component 1501 and disposing the third sub-component 1500 in the groove, the influence on the volume of the first conductive member 130 caused by the provision of the third sub-component 1500 can be reduced.

[0182] Exemplarily, the material of the third sub-component 1500 is stainless steel, and the material of the fourth sub-component 1501 is aluminum.

[0183] In the above scheme, by setting the resistivity of the third sub-component 1500 to be greater than the resistivity 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, thereby reducing the risk of the second deformable member 16 or the contact portion between the second deformable member 16 and the second conductive member 150 melting due to a large current, thereby damaging the structure and causing failure of the overcharging 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, thereby improving the space utilization rate of the second conductive member 150, thereby facilitating the improvement of the volume energy density of the battery cell 10 and the battery 100.

[0184] In other embodiments, the resistivity of the third subcomponent 1500 may be equal to the resistivity of the fourth subcomponent 1501, in which case the volume of the third subcomponent 1500 may be set larger. In other embodiments, the resistivity of the third subcomponent 1500 may be less than the resistivity of the fourth subcomponent 1501, in which case the volume of the third subcomponent 1500 may be set larger.

[0185] In some embodiments, the resistance of the third subcomponent 1500 is not less than 0.3 milliohms and not more than 3 milliohms. For example, the resistance of the third subcomponent 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.

[0186] In some embodiments, the sum of the value of the resistance of the first subcomponent 1300 and the value of the resistance of the third subcomponent 1500 is not less than 0.3 milliohms and not greater than 3 milliohms.

[0187] In some embodiments, a method for assembling the third subcomponent 1500 and the fourth subcomponent 1501 is provided, combining Figure 13 A third groove is formed on the side of the fourth subcomponent 1501 facing the first wall 110, and a portion of the third subcomponent 1500 is disposed in the third groove. A second convex portion is formed on the inner circumferential surface of the third groove, and the second convex portion protrudes in the radial direction of the third groove, and the second convex portion is an annular structure extending in the circumferential direction of the third groove. A second flange is formed on the outer circumferential surface of the third subcomponent 1500, and the second flange can cooperate with the second convex portion. The second flange is located on the side of the second convex portion away from the first wall 110, and the second flange and the second convex portion abut against each other in the thickness direction z of the first wall. The third subcomponent 1500 can protrude from the side of the fourth subcomponent 1501 facing the first wall 110, and is used to contact the second deformable member 16.

[0188] In some embodiments, a fourth groove is formed on a side of the fourth sub-component 1501 facing the first wall 110, the third groove is disposed on the bottom surface of the fourth groove, and a side of the second convex portion 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 side surface of the fourth sub-component 1501 has the third groove, the third sub-component 1500 is assembled into the third groove, and the inner side surface of the fourth sub-component 1501 is stamped or extruded, so that the inner side surface of the fourth sub-component 1501 is locally deformed to form the second convex portion that abuts against the third sub-component 1500, and the fourth groove is formed.

[0189] In some embodiments, along the thickness direction z of the first wall, the value of the maximum dimension of the third sub-component 1500 may be not less than 0.1 mm and not greater than 5 mm. Exemplarily, along the thickness direction z of the first wall, the maximum dimension of the third sub-component 1500 may 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.

[0190] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 , the first pole column 131 and the second pole column 151 are spaced apart along the first direction x. Along the first direction x, the first deformable member 14 is located on a side of the first pole column 131 facing away from the second pole column 151, and / or the second deformable member 16 is located on a side of the second pole column 151 facing away from the first pole column 131.

[0191] The first direction x may 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. Exemplarily, the first wall 110 is an end cover, the end cover is square, and the first direction x may be the length direction of the end cover.

[0192] "Along the first direction x, the first deformable member 14 is located on a side of the first pole column 131 facing away from the second pole column 151" can be understood as that along the first direction x, the first deformable member 14 is away from the middle of the first wall 110 relative to the first pole column 131, that is, the first deformable member 14 is on the outer side and the first pole column 131 is on the inner side.

[0193] "The second deformable member 16 is located on a side of the second pole column 151 facing away from the first pole column 131" can be understood as that 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 column 151, that is, the second deformable member 16 is on the outer side and the second pole column 151 is on the inner side.

[0194] In some embodiments, the positional relationship of the first deformable member 14, the first terminal 131, the second deformable member 16, and the second terminal 151 in the first direction x may include the following cases. Case 1: the first deformable member 14, the first terminal 131, the second terminal 151, and the second deformable member 16; Case 2: the first deformable member 14, the first terminal 131, the second deformable member 16, and the second terminal 151; Case 3: the first terminal 131, the first deformable member 14, the second terminal 151, and the second deformable member 16.

[0195] Compared with the case where the terminal is on the outer side of the corresponding deformable member, in the above solution, by arranging the first deformable member 14 on the side of the first terminal 131 facing away from the second terminal 151, and / or arranging the second deformable member 16 on the side of the second terminal 151 facing away from the first terminal 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 charge and discharge performance of the battery 100 can be improved.

[0196] According to some embodiments of the present application, a battery 100 is further provided, and the battery 100 has the battery cell 10 described above. Please refer to Figure 3 , the battery 100 includes the battery cell 10 and a box body, and the battery cell 10 is accommodated in the box body. Wherein, the box body is used to provide an accommodation space for the battery cell 10, and the box body can adopt various structures.

[0197] In the battery 100, the number of battery cells 10 can be one or more, and each battery cell 10 can be fixed to the box body through a connecting member (such as a bolt), or each battery cell 10 can be fixed to the box body by bonding.

[0198] According to some embodiments of the present application, an energy storage device 2000 is further provided, and the energy storage device 2000 includes the battery cell 10 described above.

[0199] In some embodiments, the battery cells 10 can first form the battery 100, and one or more batteries 100 are then applied to the energy storage device. Please refer to Figure 2 , 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, parallel, or in a hybrid connection with each other.

[0200] According to some embodiments of the present application, an electrical device is further provided, and the electrical device includes the battery cell 10 described above. In some embodiments, the battery cells 10 first form the battery 100, and one or more batteries 100 are then applied to the electrical device.

[0201] In some embodiments, please refer to Figure 1, the electrical device is a vehicle 1000. A controller 200, a motor 300 and a battery 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery 100 to supply power to the motor 300.

[0202] According to some embodiments of the present application, a battery cell 10 is provided. Figures 4 - 13 .

[0203] The battery 100 includes a housing 11 , an electrode assembly 12 , a first electrode terminal 13 , a first deformable member 14 , a second electrode terminal 15 , and a second deformable member 16 .

[0204] The housing 11 includes a shell 111 and a first wall 110. A housing cavity is formed inside the shell 111, and the housing cavity is used to accommodate the electrode assembly 12. The shell 111 has an opening connected to the housing cavity. The first wall 110 covers the opening of the shell 111 and forms a sealed connection to form 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. For example, the number of electrode assemblies 12 is two, and the two electrode assemblies 12 are stacked.

[0205] The first electrode terminal 13, the first deformable member 14, the second electrode terminal 15, and the second deformable member 16 are installed on the first wall 110. The first electrode terminal 13 is insulated and isolated from the first wall 110 by an insulating structure, the second electrode terminal 15 is insulated and isolated 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 side surface of the first wall 110 and are respectively electrically connected to the first wall 110.

[0206] In some embodiments, a fifth insulating member 174 is disposed on the inner side of the first wall 110 , and the fifth insulating member 174 can insulate and isolate the electrode assembly 12 from the first wall 110 .

[0207] In some embodiments, the first electrode terminal 13 includes a first conductive member 130 and a first pole 131 riveted to each other. The first conductive member 130 is located on the side of the first wall 110 away from the electrode assembly 12, and the first conductive member 130 is used to connect with an external busbar component (such as a bar), and a portion of the first pole 131 is located in the housing 11 and connected to the first pole ear 120 of the electrode assembly 12 through the first adapter 121.

[0208] A first insulating member 170 is disposed between the first conductive member 130 and the first wall 110 , and a second insulating member 171 is disposed between the first pole 131 and the first wall 110 .

[0209] In some embodiments, the first conductive member 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 pole 131 is riveted to the second sub-component 1301, and the second sub-component 1301 is used to connect to the current collecting component. In some embodiments, the first sub-component 1300 is generally cylindrical, and the second sub-component 1301 is in the shape of a long strip.

[0210] 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 .

[0211] In some embodiments, a first groove 13010 is formed on the inner side of the second subcomponent 1301 , and the first subcomponent 1300 can be partially disposed in the first groove 13010 , for example, assembled in the first groove 13010 by a stamping process, and another part of the first subcomponent protrudes toward the second through hole 1101 .

[0212] For example, see Figure 8 The first subcomponent 1300 is formed with a first flange 13000 at the upper end, and a first groove 13010 is formed on the inner side surface of the second subcomponent 1301, and the upper end of the first subcomponent 1300 is placed in the first groove 13010. The inner side surface of the second subcomponent 1301 is punched or extruded along the circumference of the first subcomponent 1300, so that the inner side surface of the second subcomponent 1301 is partially deformed, and a first convex portion 13011 abutting against the first flange 13000 is formed on the inner circumference of the first groove 13010, and a second groove 13012 is formed on the inner side surface of the second subcomponent 1301.

[0213] In some embodiments, the second electrode terminal 15 includes a second conductive member 150 and a second pole 151 riveted to each other. The second conductive member 150 is located on the side of the first wall 110 away from the electrode assembly 12, and the second conductive member 150 is used to connect with an external busbar component (such as a bar), and a portion of the second pole 151 is located in the housing 11 and connected to the second pole ear 122 of the electrode assembly 12 through the second adapter 123.

[0214] A third insulating member 172 is disposed between the second conductive member 150 and the first wall 110 , and a fourth insulating member 173 is disposed between the second pole 151 and the first wall 110 .

[0215] In some embodiments, the second conductive member 150 includes a third sub-component 1500 and a fourth sub-component 1501 that are connected to each other. The material of the third sub-component 1500 can be stainless steel, and the material of the fourth sub-component 1501 can be aluminum. The second terminal post 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 in the shape of a long strip plate.

[0216] 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.

[0217] In some embodiments, a third groove is formed on the inner side of the fourth sub-component 1501. The third sub-component 1500 can be partially disposed in the third groove, for example, assembled in the third groove by a stamping process. Another part of the third sub-part protrudes toward the fourth through-hole 1103. Exemplarily, a second flange is formed at the upper end of the third sub-component 1500. A third groove is formed by grooving the inner side surface of the fourth sub-component 1501, and the upper end of the third sub-component 1500 is placed in the third groove. The inner side surface of the fourth sub-component 1501 is stamped or extruded along the circumferential direction of the third sub-component 1500, so that the inner side surface of the fourth sub-component 1501 is locally deformed, a second convex portion that abuts against the second flange is formed on the inner circumferential surface of the third groove, and a fourth groove is formed on the inner side surface of the fourth sub-component 1501.

[0218] The first deformable member 14 and the second deformable member 16 can be structural members that are deformed under pressure. In some embodiments, the first deformable member 14 and the second deformable member 16 can be flipping pieces 18 respectively, and the flipping pieces 18 are flipped under pressure.

[0219] In some embodiments, when the battery cell 10 is in an abusive working condition due to overcharging or the like, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches the first threshold, the first deformable member 14 deforms, and the first deformable member 14 contacts the first sub-component 1300, short-circuiting the first electrode terminal 13 and the housing 11. When the internal pressure of the battery cell 10 reaches the second threshold, the second deformable member 16 deforms, and the second deformable member 16 contacts the third sub-component 1500, short-circuiting the second electrode terminal 15 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. The instantaneously generated large current can fuse the electrical connection components inside the battery cell 10, cutting off the charge and discharge circuit of the battery cell 10, thereby playing a role in overcharge protection. The fused electrical connection components can include the first adapter 121 and / or the second adapter 123. Exemplarily, the first adapter 121 has a first fusing portion, and when a relatively large current passes through, the first fusing portion can be fused, thereby disconnecting the current path between the first tab 120 and the first electrode terminal 13.

[0220] In some embodiments, when the battery cell 10 is normally charged and discharged, the current in the charge and discharge circuit of the battery cell 10 can enter the battery cell 10 through the current collecting component corresponding to the second electrode terminal 15 and the fourth sub-component 1501, and then flow to the current collecting component corresponding to the second sub-component 1301 through the second sub-component 1301. For example, the path of the current can be the fourth sub-component 1501, the second pole 151, the second adapter 123, the second tab 122, the electrode assembly 12, the first tab 120, the first adapter 121, the first pole 131, and the second sub-component 1301. Exemplarily, 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 internally short-circuited. The path of the current can be the second tab 122, the second adapter 123, the second pole 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 pole 131, the first adapter 121, and the first tab 120.

[0221] In the above solution, by providing the first sub-component 1300 to contact the deformed first deformable member 14 and the third sub-component 1500 to contact the deformed second deformable member 16, the resistance value of the internal current loop of the battery cell 10 can be increased, so that the current in the internal current loop of the battery cell 10 is reduced, thereby reducing the risk that the contact part between the deformable member or the deformable member and the conductive member melts due to excessive current, resulting in the failure of the deformable member and the inability to achieve an internal short circuit of the battery cell 10 to fuse the internal electrical connection components of the battery cell 10, thereby cutting off the charge and discharge circuit of the battery cell 10 and realizing overcharge protection, thus effectively improving the reliability of the battery cell 10 under abusive conditions such as overcharge, and further making the battery 100 highly reliable.

[0222] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; A first conductive member, disposed on the outer side of the first wall and insulated from the first wall, the first conductive member comprising a first sub-component and a second sub-component connected to each other, the second sub-component being used to connect to the busbar component; A first pole connected to the second sub-component; A first deformable member is electrically connected to the first wall, and the first deformable member is configured to be deformable to contact the first sub-component to electrically connect the first pole to the first wall.

2. The battery cell according to claim 1, characterized in that: The resistivity of the first subcomponent is greater than the resistivity of the second subcomponent.

3. The battery cell according to claim 1, characterized in that: The first subcomponent is made of stainless steel, and the second subcomponent is made of aluminum.

4. The battery cell according to claim 1, characterized in that: The resistance of the first subcomponent is not less than 0.3 milliohms and not more than 3 milliohms.

5. The battery cell according to claim 1, characterized in that: A first groove is formed on a side of the second subcomponent facing the first wall, and at least a portion of the first subcomponent is disposed in the first groove.

6. The battery cell according to claim 5, characterized in that: A first convex portion is formed on the inner peripheral surface of the first groove, and along the thickness direction of the first wall, a portion of the first subcomponent is located on a side of the first convex portion away from the first wall.

7. The battery cell according to claim 6, characterized in that: The first protrusion is an annular structure extending along the circumference of the first groove.

8. The battery cell according to claim 6, characterized in that: A first flange is formed on the outer peripheral surface of the first subcomponent. Along the thickness direction of the first wall, the first flange is located on a side of the first protrusion away from the first wall.

9. The battery cell according to claim 8, characterized in that: The first flange is an annular structure extending along the circumference of the first groove.

10. The battery cell according to claim 6, characterized in that: In a direction pointing toward the inside of the battery cell, the first sub-component protrudes from a side of the second sub-component facing the first wall.

11. The battery cell according to claim 6, characterized in that: A second groove is formed on the side of the second subcomponent facing the first wall. The first groove is arranged on the groove bottom surface of the second groove. The side of the first protrusion facing the first wall is coplanar with the groove bottom surface of the second groove.

12. The battery cell according to claim 1, characterized in that: Along the thickness direction of the first wall, the maximum dimension of the first subcomponent is not less than 0.1 mm and not more than 5 mm.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The battery cell further comprises: A second conductive member, disposed on the outer side of the first wall and insulated from the first wall; A second pole connected to the second conductive member; The second deformable member is electrically connected to the first wall, and the second deformable member is configured to be deformable to contact the second conductive member so as to electrically connect the second pole to the first wall.

14. The battery cell according to claim 13, characterized in that: The second conductive member includes a third sub-member and a fourth sub-member connected to each other, the third sub-member is used to contact the second deformable member, the fourth sub-member is used to connect to the busbar member, and the second pole is connected to the fourth sub-member.

15. The battery cell according to claim 14, characterized in that: The resistivity of the third subcomponent is greater than the resistivity of the fourth subcomponent.

16. The battery cell according to claim 13, characterized in that: 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 a side of the first pole away from the second pole, and / or the second deformable member is located on a side of the second pole away from the first pole.

17. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 16.

18. An energy storage device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 16.

19. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 16, wherein the battery cell is used to provide electrical energy.

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