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 monomer comprises a shell, a first conductive piece, a first pole, a first deformation piece and a first connecting piece. The housing has a first wall. The first conductive piece is arranged on the outer side of the first wall and is insulated from the first wall. The first pole is connected with the first conductive piece. The first deformation piece is electrically connected with the first wall, and the first deformation piece is configured to be deformable to make contact with the first conductive piece so as to electrically connect the first pole with the first wall. The first connector connects the first conductive member and 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 field of battery technology, 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 key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

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

[0004] The present application provides a battery cell, a battery, an energy storage device and an electrical device. The technical solution provided in 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 pole, a first deformable member, and a first connecting member. The housing has a first wall. The first conductive member is disposed on the outside of the first wall and is insulated from the first wall. The first pole is connected to the first conductive member. The first deformable member is electrically connected to the first wall, and the first deformable member is configured to be deformable to contact the first conductive member to electrically connect the first pole to the first wall. The first connecting member connects the first conductive member and the first wall.

[0006] In the above scheme, by setting a first connecting member to connect the first conductive member and the first wall, the structural stability between the first conductive member and the first wall can be improved, and the risk of the first conductive member being unable to contact with the first deformable member due to excessive deformation due to the internal pressure of the battery cell can be reduced. When the battery cell is in an abuse condition such as overcharging, the first deformable member can effectively contact with the first conductive member to achieve overcharging protection, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0007] According to some embodiments of the present application, the first wall has a first through hole and a second through hole arranged along a first direction, the first pole is passed through the first through hole, and the first deformable member closes the second through hole. Along the first direction, the first connecting member is located on a side of the second through hole away from the first through hole.

[0008] In the above solution, along the first direction, by disposing the first connecting member on a side of the first conductive member facing away from the first pole column, the first electrical connecting member can effectively reinforce the portion of the first conductive member that is prone to deformation under force, reducing the risk that the first conductive member deforms excessively due to the internal pressure of the battery cell and fails to contact the first deformation member. When the battery cell is in abusive conditions such as overcharging, the first deformation member effectively contacts the first conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0009] According to some embodiments of the present application, the number of the first connecting members is plural, and the plural first connecting members are spaced apart along a second direction, and the second direction is perpendicular to the first direction.

[0010] In the above solution, by disposing a plurality of first connecting members in the second direction, the reinforcement effect on the first conductive member can be effectively improved, reducing the risk that the first conductive member deforms excessively due to the internal pressure of the battery cell and fails to contact the first deformation member. When the battery cell is in abusive conditions such as overcharging, the first deformation member effectively contacts the first conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0011] According to some embodiments of the present application, the first wall and the first conductive member are riveted by the first connecting member.

[0012] In the above solution, the first connecting member connects the first wall and the first conductive member in a riveting manner, which can reduce the assembly difficulty of the battery cell. On the one hand, it enables the first conductive member and the first wall to have good anti-impact ability. On the other hand, the riveting has less influence on the first conductive member and the first wall, which is beneficial to maintaining the structural accuracy of the first conductive member and the first wall. When the battery cell is in abusive conditions such as overcharging, the first deformation member effectively contacts the first conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0013] According to some embodiments of the present application, the first conductive member has a third through hole, the first connecting member passes through the third through hole, one end of the first connecting member is connected to the first wall, and a first flange is formed at the other end of the first connecting member, and along the thickness direction of the first wall, the first flange abuts against the first conductive member.

[0014] In the above solution, by providing the third through hole in the first conductive member, one end of the first connecting member is connected to the first wall, and the other end can pass through the first conductive member to achieve the mutual riveting of the first conductive member and the first wall, so that the riveting part is located outside the housing. Therefore, compared with forming a through hole for the first connecting member to pass through in the first wall, the risk of internal liquid leakage of the battery cell can be reduced, and further the reliability of the battery can be improved.

[0015] According to some embodiments of the present application, a first groove is formed on a side of the first conductive member facing away from the first wall, a third through hole penetrates through the bottom of the first groove, and at least a part of the first flange is located in the first groove.

[0016] In the above solution, by providing the first groove on the side of the first conductive member facing away from the first wall, at least a part of the first flange can be accommodated, thereby reducing the space occupied by the first connecting member in the thickness direction of the first wall, making the battery cell structure compact and having a high volumetric energy density.

[0017] According to some embodiments of the present application, the battery cell further includes a first insulating member, and at least a part of the first insulating member is disposed between the first connecting member and the first conductive member for insulating and isolating the first connecting member and the first conductive member.

[0018] In the above solution, by providing the first insulating member between the first connecting member and the first conductive member, the risk of the first connecting member conducting the first conductive member and the first wall, resulting in an internal short circuit of the battery cell, can be reduced, which is beneficial to improving the reliability of the battery.

[0019] According to some embodiments of the present application, the battery cell further includes a second insulating member, and at least a part of the second insulating member is disposed between the first conductive member and the first wall for insulating and isolating the first conductive member and the first wall.

[0020] In the above solution, by providing the second insulating member between the first conductive member and the first wall, the first conductive member and the first wall can be insulated and isolated from each other, thereby reducing the risk of an internal short circuit of the battery cell, which is beneficial to improving the reliability of the battery.

[0021] According to some embodiments of the present application, the second insulating member is provided with a fourth through hole, and the first connecting member passes through the fourth through hole.

[0022] In the above solution, by providing the fourth through hole for the first connecting member to pass through, the risk of interference between the first connecting member and the second insulating member can be reduced, which is beneficial to the assembly of the battery cell and the improvement of the manufacturing efficiency of the battery cell, and further beneficial to the improvement of the manufacturing efficiency of the battery.

[0023] According to some embodiments of the present application, the first insulating member and the second insulating member are of a split structure with each other, or the first insulating member and the second insulating member are integrally formed.

[0024] In the above solution, by setting the first insulating member and the second insulating member to be of a split structure with each other, the cost of structure manufacturing and maintenance can be reduced, which is beneficial to the control of the cost of the battery cell; by setting the first insulating member and the second insulating member to be integrally formed, the assembly process can be simplified, the assembly efficiency of the battery cell can be improved, and the manufacturing efficiency of the battery cell can be improved.

[0025] According to some embodiments of the present application, the first connecting member is integrally formed with the first wall, or the first connecting member is welded to the first wall.

[0026] In the above solution, by arranging the first connector to be integrally formed with the first wall, the first connector and the first wall can have a higher connection stability, so that the first wall and the first conductive member can have a higher structural stability through the first connector. By arranging the first connector to be welded to the first wall, the manufacturing difficulty of the first connector can be reduced, the manufacturing efficiency of the battery cell can be improved, and the manufacturing efficiency of the battery cell can be improved.

[0027] According to some embodiments of the present application, the battery cell further includes a second conductive member, a second pole, a second deformable member, and a second connecting member. The second conductive member is disposed outside the first wall and is insulated from the first wall. The second pole 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 to the first wall. The second connecting member connects the second conductive member and the first wall.

[0028] In the above scheme, on the one hand, by providing a second deformable member, when the internal pressure of the battery cell reaches a certain level, the second deformable member is deformed to contact the second conductive member, so that the second pole is electrically connected to the first wall, and the first deformable member is in contact with the first conductive member, so that the electrical connection component inside the battery cell is melted due to 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, thereby making the battery have higher reliability; on the other hand, by providing a second connecting member to connect the second conductive member and the first wall, the structural stability between the second conductive member and the first wall can be improved, and the risk of the second conductive member being unable to contact the second deformable member due to excessive deformation due to the internal pressure of the battery cell is reduced, so that when the battery cell is in abuse conditions such as overcharging, the second deformable member effectively contacts the second conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell, and then improving the reliability of the battery.

[0029] 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.

[0030] 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.

[0031] In a second aspect, some embodiments of the present application further provide a battery, which includes the battery cell provided in the first aspect.

[0032] 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.

[0033] In a fourth aspect, some embodiments of the present application further provide an electrical device, which includes the battery cell provided in the first aspect, and the battery cell is used to provide electrical energy.

[0034] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0035] 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 some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 Schematic diagram of a vehicle in some embodiments of the present application;

[0037] Figure 2 Schematic diagram of an energy storage device in some embodiments of the present application;

[0038] Figure 3 Exploded perspective view of a battery in some embodiments of the present application;

[0039] Figure 4 Exploded perspective view of a battery cell in some embodiments of the present application;

[0040] Figure 5 Exploded perspective view of a partial structure of a battery cell in some embodiments of the present application;

[0041] Figure 6 Internal schematic diagram of a partial structure of a battery cell in some embodiments of the present application;

[0042] Figure 7 Schematic diagram of a first electrode terminal, a first wall, and a first deformable member in some embodiments of the present application;

[0043] Figure 8 Internal structure schematic diagram of a first conductive member, a first wall, and a first connecting member in some embodiments of the present application;

[0044] Figure 9Schematic diagram of the first wall and the first connecting member in some embodiments of the present application;

[0045] Figure 10 Schematic diagram of the first conductive member in some embodiments of the present application;

[0046] Figure 11 Schematic diagram of the first insulating member and the second insulating member in some embodiments of the present application;

[0047] Figure 12 Schematic diagram of the second electrode terminal, the first wall and the second deformation member in some embodiments of the present application;

[0048] Figure 13 Internal structural schematic diagram of the second conductive member, the first wall and the second connecting member in some embodiments of the present application.

[0049] Icons: 10 - battery cell; 11 - housing; 110 - casing; 111 - first wall; 1110 - first through hole; 1111 - second through hole; 1112 - fifth through hole; 1113 - sixth through hole; 12 - first electrode terminal; 120 - first conductive member; 1200 - third through hole; 1201 - first groove; 1203 - riveting hole; 121 - first pole; 13 - first deformation member; 14 - first connecting member; 140 - first flange; 150 - first insulating member; 151 - second insulating member; 1510 - fourth through hole; 1511 - first perforation; 1512 - second perforation; 152 - second insulating structure; 153 - third insulating structure; 154 - fourth insulating structure; 155 - third insulating member; 156 - fifth insulating structure; 16 - second electrode terminal; 160 - second conductive member; 1600 - seventh through hole; 161 - second pole; 17 - second deformation member; 18 - second connecting member; 180 - second flange; 20 - electrode assembly; 21 - first tab; 210 - first adapter; 22 - second tab; 220 - second adapter; 100 - battery; x - first direction; y - second direction; z - thickness direction of the first wall; 1000 - vehicle; 200 - controller; 300 - motor; 2000 - energy storage device; 2001 - cabinet; 30 - box; 31 - first box part; 32 - second box part. Detailed Description of the Embodiments

[0050] The embodiments of the technical solutions 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 solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this 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 this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0053] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0055] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of this application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, technical terms such as "installation", "connection", "fixation", etc. 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 components or the interaction relationship between two components. 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 situations.

[0058] In the present application, the battery cell may 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. Generally, the battery includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign substances from affecting the charging or discharging of the battery cells.

[0059] 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 works 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, and 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, 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, and 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. In order 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.

[0060] The battery cell further includes a housing, and the electrode assembly and the electrolyte are disposed inside the housing. The housing has a first wall, and an electrode terminal is provided on the first wall. The electrode terminal is connected to the electrode assembly and is used for input and output of electric energy. In some embodiments, the electrode terminal includes 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 for connection with an external busbar component to achieve input and output of electric energy. The pole column is directly or indirectly connected to the tab of the electrode assembly.

[0061] 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.

[0062] 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 deformation member, and the deformation 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 deformation member deforms under the action of the internal pressure and can contact the electrode terminal, for example, connected 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 member inside the battery cell melts due to the large current generated by the short circuit, thereby cutting off the charge-discharge circuit of the battery cell and playing a role in overcharge protection.

[0063] However, when the internal pressure of the battery cell increases and causes the battery cell to expand internally, the conductive member is prone to deformation or misalignment, resulting in the deformation member being unable to contact the conductive member, leading to the failure of overcharge protection and affecting the reliability of the battery.

[0064] In view of this, to improve the problem that due to the easy deformation or misalignment of the conductive member, the deformation member cannot contact the conductive member, resulting in 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, a first deformation member, and a first connecting 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 pole column is connected to the first conductive member. 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 conductive member to electrically connect the first pole column to the first wall. The first connecting member connects the first conductive member and the first wall.

[0065] In the above solution, by providing the first connecting member to connect the first conductive member and the first wall, the structural stability between the first conductive member and the first wall can be improved, and the risk that the first conductive member cannot contact the first deformation member due to excessive deformation under the action of the internal pressure of the battery cell can be reduced, so that when the battery cell is in abusive conditions such as overcharging, the first deformation member effectively contacts the first conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0066] The technical solutions described in the embodiments of the present application are applicable to batteries, energy storage devices using batteries, and power-consuming devices using batteries.

[0067] 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 provided on the cabinet body.

[0068] The power-consuming device may 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 may be a new energy vehicle, and the new energy vehicle may 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 a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, a planer, etc. The power-consuming device in the embodiments of the present application includes but is not limited to those mentioned above.

[0069] For the convenience of description, the following embodiments will be described by taking the power-consuming device as a vehicle as an example.

[0070] Figure 1 It is a schematic diagram of a vehicle in some embodiments of the present application.

[0071] A controller 200, a motor 300, and a battery 100 may be provided 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 may be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as the operating power supply of the vehicle 1000 and used 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 may not only be used as the operating power supply of the vehicle 1000 but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] Please refer to Figure 2 , Figure 2 It is a schematic diagram of an energy storage device in some embodiments of the present application.

[0073] The energy storage device 2000 may include a cabinet body 2001 and a plurality of batteries 100. The plurality of batteries 100 may be provided inside the cabinet body 2001. The plurality of batteries 100 may be connected in series, in parallel, or in a hybrid connection with each other.

[0074] Please refer to Figure 3 , Figure 3 which is an exploded perspective view of the battery 100 in some embodiments of the present application.

[0075] 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 portion 31 and a second housing portion 32, the first housing portion 31 and the second housing portion 32 are covered with each other, and the first housing portion 31 and the second housing portion 32 jointly define an accommodation space for accommodating the battery cells 10. The second housing portion 32 may be a hollow structure with one end open, the first housing portion 31 may be a plate-like structure, and the first housing portion 31 is covered on the open side of the second housing portion 32 so that the first housing portion 31 and the second housing portion 32 jointly define an accommodation space; the first housing portion 31 and the second housing portion 32 may also both be hollow structures with one side open, and the open side of the first housing portion 31 is covered on the open side of the second housing portion 32. Of course, the housing 30 formed by the first housing portion 31 and the second housing portion 32 can be of various shapes, such as a cylinder, a cuboid, etc.

[0076] 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 an adhesive method.

[0077] Some embodiments of the present application provide a battery cell 10. Please refer to Figures 4 - 8 , Figure 4 which is an exploded perspective view of the battery cell 10 in some embodiments of the present application, Figure 5 which is an exploded perspective view of the partial structure of the battery cell 10 in some embodiments of the present application, Figure 6 which is an internal schematic view of the partial structure of the battery cell 10 in some embodiments of the present application, Figure 7 which is a schematic view of the first electrode terminal 12, the first wall 111 and the first deformation member 13 in some embodiments of the present application, Figure 8 which is an internal structure schematic view of the first conductive member 120, the first wall 111 and the first connecting member 14 in some embodiments of the present application.

[0078] The battery cell 10 includes a housing 11, a first conductive member 120, a first pole 121, a first deformation member 13, and a first connecting member 14. The housing 11 has a first wall 111. The first conductive member 120 is disposed outside the first wall 111 and insulated from the first wall 111. The first pole 121 is connected to the first conductive member 120. The first deformation member 13 is electrically connected to the first wall 111, and the first deformation member 13 is configured to be deformable to contact the first conductive member 120 to electrically connect the first pole 121 and the first wall 111. The first connecting member 14 connects the first conductive member 120 and the first wall 111.

[0079] The housing 11 is a component for accommodating the electrode assembly 20, 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 110 and an end cap. An accommodation cavity is formed inside the housing body 110 for accommodating the electrode assembly 20. The housing body 110 has an opening communicating with the accommodation cavity, and the end cap covers the opening of the housing body 110 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and the electrolyte. The end cap can be connected to the housing body 110 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 110, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate.

[0080] 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 110 or other parts of the housing 11 can be made of non-metallic materials.

[0081] In some embodiments, when assembling the battery cell 10, the electrode assembly 20 can be first placed into the housing body 110, and the electrolytic solution can be filled into the housing body 110, and then the end cap is covered on the opening of the housing body 110 to complete the assembly of the battery cell 10. Or, in some embodiments, when assembling the battery cell 10, the electrode assembly 20 can be first placed into the housing body 110, then the end cap is covered on the opening of the housing body 110, and the electrolytic solution is filled into the housing body 110 through the liquid injection hole on the end cap, and then the liquid injection hole is closed to complete the assembly of the battery cell 10.

[0082] The housing 11 can be of various shapes, such as a cylindrical or prismatic structure, etc. The shape of the housing 11 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cylindrical structure, a cylindrical housing 11 can be selected. If the electrode assembly 20 is a flat structure, the housing 11 can be square.

[0083] The first wall 111 is a part of the structure of the housing 11. The first wall 111 can be used to support the first electrode terminal 12 so that the first electrode terminal 12 is in a stable state to achieve input and output of electrical energy. In some embodiments, the first wall 111 can be a part of the housing 110, such as a side wall or a bottom wall of the housing 110. In some embodiments, the first wall 111 can be an end cover.

[0084] The first electrode terminal 12 is a component installed on the first wall 111. The first electrode terminal 12 is used to be electrically connected to the electrode assembly 20, so that the current flows into or flows out of the first pole lug 21 through the first electrode terminal 12. The polarity of the first electrode terminal 12 and the first pole lug 21 is the same. In some embodiments, the first electrode terminal 12 is made of a metal material, for example, aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 12 can be connected to the first pole lug 21 through a first adapter 210. Exemplarily, the first pole lug 21 of the electrode assembly 20 is composed of a plurality of first sub-pole lugs stacked together, and one end of the first adapter 210 can be welded to the first pole lug 21, and then the other end of the first adapter 210 can be welded to the first electrode terminal 12.

[0085] In some embodiments, the first electrode terminal 12 includes a first conductive member 120 and a first pole 121. The first conductive member 120 is located on the side of the first wall 111 away from the electrode assembly 20, and the first conductive member 120 is used to connect to an external busbar component (e.g., a bar). Exemplarily, the first conductive member 120 is welded to the busbar component. The first pole 121 is connected to the first pole lug 21 of the electrode assembly 20, and exemplarily, the first pole 121 is connected to the first pole lug 21 through the first adapter 210. The first conductive member 120 and the first pole 121 are connected to each other, and the connection relationship between the first conductive member 120 and the first pole 121 includes welding, riveting, screw connection, or integral molding, etc. Exemplarily, in some embodiments, the first conductive member 120 and the first pole 121 are riveted to each other, the first conductive member 120 is generally plate-shaped, the first conductive member 120 is formed with a rivet hole, the first pole 121 is generally columnar, such as a cylindrical or polygonal column, etc., a portion of the first pole 121 passes through the first through hole 1110 of the first wall 111 and is riveted in the rivet hole, and the other portion is located in the outer shell 11 and is connected to the first pole ear 21 through the first adapter 210.

[0086] In some embodiments, a first insulating structure is provided between the first conductive member 120 and the first wall 111, and the first insulating structure is used to insulate and isolate the first conductive member 120 from the first wall 111. A second insulating structure 152 is provided between the first pole 121 and the first wall 111. For example, a second insulating structure 152 is provided between the outer periphery of the first pole 121 and the wall of the first through hole 1110.

[0087] In some embodiments, the first insulating structure and / or the second insulating structure 152 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material. Exemplarily, in some embodiments of the present application, the material of the first insulating structure and / or the second insulating structure 152 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the first insulating structure and / or the second insulating structure 152 can also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0088] In some embodiments, the resistance value of the first insulating structure and / or the second insulating structure 152 can 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 structure and / or the second insulating structure 152 can be greater than or equal to 200 MΩ.

[0089] The first deformable member 13 is mounted on the first wall 111, and the first deformable member 13 is electrically connected to the first wall 111. In some embodiments, the first deformable member 13 can be made of a metal material. For example, the first deformable member 13 is made of aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal. In some embodiments, the first deformable member 13 can be welded to the inner side of the first wall 111.

[0090] The first deformable member 13 is a structural member that deforms under the internal pressure of the battery cell 10. The first deformable member 13 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 deformable member 13 deforms to contact the first electrode terminal 12, such as the first conductive member 120, thereby conducting the first wall 111 and the first electrode terminal 12, and short-circuiting the positive and negative electrodes inside the battery cell 10.

[0091] In some embodiments, the first deformable member 13 can be a flip piece, and the flip piece flips under the action of pressure. Exemplarily, the outer contour of the flip piece is disk-shaped, and includes a skirt, a flip foil, and an electrical connection portion connected in sequence from the outside to the inside. The skirt can be connected to the first wall 111. The thickness of the flip foil is relatively thin and is used to deform and flip under pressure. After the flip foil flips, it can push the electrical connection portion towards the first conductive member 120 of the first electrode terminal 12, so that the electrical connection portion contacts the first conductive member 120.

[0092] Exemplarily, the first conductive member 120 is in the shape of a long strip plate, with a relatively large dimension in the first direction x. The first wall 111 has a first through hole 1110 and a second through hole 1111, and the first through hole 1110 and the second through hole 1111 are arranged at intervals along the first direction x. The first pole 121 passes through the first through hole 1110 and is connected to the first conductive member 120. Along the first direction x, the first deformation member 13 is on one side of the first pole 121, and the skirt of the first deformation member 13 is welded to the first wall 111, so that the first deformation member 13 closes the second through hole 1111. When in the natural state, the flip foil is in a state of collapsing in the direction away from the first wall 111. When the internal pressure of the battery cell 10 reaches the first threshold, the flip foil flips towards the direction facing the first wall 111 to push the electrical connection part, so that the electrical connection part passes through the second through hole 1111 and contacts the first conductive member 120.

[0093] In some embodiments, the first pole 121 is electrically connected to the first tab 21 through the first adapter 210. The second tab 22 of the electrode assembly 20 can be electrically connected to the housing 11. The second tab 22 and the first tab 21 have opposite polarities. The second tab 22 is directly or through the second adapter 220 connected to the housing 11, or a second electrode terminal 16 is provided on the housing 11, the second electrode terminal 16 is electrically connected to the housing 11, and the second tab 22 is directly or through the second adapter 220 connected to the second electrode terminal 16. When the internal pressure of the battery cell 10 reaches the first threshold, the first deformation member 13 deforms to short-circuit the first electrode terminal 12 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 fuse 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 fused electrical connection components may include the first adapter 210 and / or the second adapter 220. Exemplarily, the first adapter 210 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 remaining part of the first adapter 210, so that when a relatively large current passes through, the first fusing portion can be fused, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 12. Exemplarily, the second adapter 220 has a second fusing portion, so that when a relatively large current passes through, the second fusing portion can be fused, thereby disconnecting the current path between the second tab 22 and the second electrode terminal 16 or the housing 11.

[0094] In some other embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 through the first adapter 210. The second tab 22 of the electrode assembly 20 can be electrically connected to the second electrode terminal 16. The second tab 22 and the first tab 21 have opposite polarities. The second electrode terminal 16 can be insulatingly mounted on the housing 11, for example, insulatingly mounted on the first wall 111 of the housing 11. The second tab 22 can be electrically connected to the second electrode terminal 16 through the second adapter 220. The second electrode terminal 16 is correspondingly provided with a second deformation member 17. The second deformation member 17 is electrically connected to the housing 11. The second deformation member 17 is configured to deform to contact the second electrode terminal 16 when the internal pressure of the battery cell 10 reaches a second threshold, so as to electrically connect the second electrode terminal 16 to the housing 11.

[0095] When the internal pressure of the battery cell 10 reaches a certain level, such as a first threshold, the first deformation member 13 deforms to contact the first conductive member 120, short-circuiting the first electrode terminal 12 and the housing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformation member 17 deforms, short-circuiting the second electrode terminal 16 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 210 and / or the second adapter 220. Exemplarily, the first adapter 210 has a first fusing portion, which can be fused when a relatively large current passes through, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 12. Exemplarily, the second adapter 220 has a second fusing portion, which can be fused when a relatively large current passes through, thereby disconnecting the current path between the second tab 22 and the second electrode terminal 16.

[0096] The first connecting member 14 is a structural member connecting the first conductive member 120 and the first wall 111. The first connecting member 14 can be used to restrain the first conductive member 120 and improve the connection stability between the first conductive member 120 and the first wall 111. In some embodiments, when the first conductive member 120 deforms due to the impact of the increasing internal pressure of the battery cell 10, the first connecting member 14 can improve the impact resistance of the first conductive member 120 and reduce the magnitude of the deformation of the first conductive member 120. In some embodiments, along the thickness direction z of the first wall, at least a part of the first connecting member 14 can be located between the first conductive member 120 and the first wall 111, so that the first conductive member 120 and the first wall 111 are connected to each other. In some other embodiments, a part of the first connecting member 14 can be connected to the first conductive member 120, and another part of the first connecting member 14 can be connected to the outer side surface of the first wall 111. For example, the first connecting member 14 is in the shape of a binding band, spanning the outer side surface of the first wall 111 and the outer side surface of the first conductive member 120.

[0097] In some embodiments, the material of the first connector 14 includes non-metallic or metallic materials. For example, the first connector 14 is made of metallic material, including but not limited to aluminum, copper, iron, steel, alloy or composite metal. When the first connector 14 is made of metallic material, it may be considered to provide an insulating structure between the first conductive member 120 and the first connector 14 to insulate and isolate the first conductive member 120 and the first connector 14, thereby reducing the risk of the first conductive member 120 being electrically connected to the first wall 111 through the first connector 14. Alternatively, the first connector 14 is made of non-metallic material, for example, the first connector 14 is made of plastic material.

[0098] In the above scheme, by setting the first connecting member 14 to connect the first conductive member 120 and the first wall 111, the structural stability between the first conductive member 120 and the first wall 111 can be improved, and the risk of the first conductive member 120 being unable to contact with the first deformable member 13 due to excessive deformation due to the internal pressure of the battery cell 10 is reduced. When the battery cell 10 is in an abuse condition such as overcharging, the first deformable member 13 effectively contacts the first conductive member 120 to achieve overcharging protection, thereby improving the reliability of the battery cell 10, and then improving the reliability of the battery 100.

[0099] According to some embodiments of this application, see Figure 9 , Figure 9 Schematic diagram of the first wall 111 and the first connecting member 14 in some embodiments of the present application. The first wall 111 has a first through hole 1110 and a second through hole 1111 arranged along the first direction x, the first pole 121 is passed through the first through hole 1110, and the first deformable member 13 closes the second through hole 1111. Along the first direction x, the first connecting member 14 is located on the side of the second through hole 1111 away from the first through hole 1110.

[0100] The first direction x may be the arrangement direction of the first pole 121 and the first deformable member 13, and the first direction x is perpendicular to the thickness direction z of the first wall. In some embodiments, the housing 11 is square, the first wall 111 is an end cover of the housing 11, and the first direction x may be the length direction of the end cover.

[0101] The first through-hole 1110 is a through-hole structure that penetrates the first wall 111 along the thickness direction z of the first wall. The shape of the first through-hole 1110 includes, but is not limited to, circular, square, triangular, or other shapes. In some embodiments, a portion of the first pole 121 is located inside the first wall 111, a part of the first pole 121 is located in the first through-hole 1110, and another part of the first pole 121 is located outside the first wall 111 and connected to the first conductive member 120. Exemplarily, a part of the first pole 121 is located inside the first wall 111, and another part passes through the first through-hole 1110 and is riveted to the first conductive member 120, so that in the thickness direction z of the first wall, the first wall 111 is clamped by the first pole 121 and the first conductive member 120. Wherein, insulating structures are respectively arranged between the first pole 121 and the first wall 111 and between the first conductive member 120 and the first wall 111, so that the first wall 111 is insulated from the first electrode terminal 12.

[0102] The second through-hole 1111 is a through-hole structure that penetrates the first wall 111 along the thickness direction z of the first wall. The shape of the second through-hole 1111 includes, but is not limited to, circular, square, triangular, or other shapes. Along the first direction x, the first deformation member 13 is located on one side of the first pole 121, and the second through-hole 1111 is located on one side of the first through-hole 1110. Exemplarily, the edge portion of the first deformation member 13 is welded to the inner surface of the first wall 111, and the portion of the first deformation member 13 for deforming to contact the first conductive member 120 faces the second through-hole 1111 to close the second through-hole 1111. When the internal pressure of the battery cell 10 reaches a certain level, the deformed portion of the first deformation member 13 can cross the second through-hole 1111 and contact the first conductive member 120.

[0103] "Along the first direction x, the first connecting member 14 is located on the side of the second through-hole 1111 away from the first through-hole 1110" can be understood as that the portion of the first connecting member 14 that exerts constraints on the first conductive member 120 and the first wall 111 is on the side of the second through-hole 1111 away from the first through-hole 1110. Exemplarily, the first connecting member 14 is a riveting post. Along the first direction x, the first pole 121 is located on one side of the second through-hole 1111, and the riveting post is located on the other side of the second through-hole 1111.

[0104] In the above solution, along the first direction x, by disposing the first connecting member 14 on the side of the first conductive member 120 facing away from the first pole 121, the first electrical connecting member can effectively reinforce the portion of the first conductive member 120 that is prone to deformation under force, reducing the risk that the first conductive member 120 deforms excessively due to the internal pressure of the battery cell 10 and fails to contact the first deformation member 13. When the battery cell 10 is in an overcharge or other abusive working conditions, the first deformation member 13 effectively contacts the first conductive member 120 to achieve overcharge protection, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery 100.

[0105] In some embodiments, the first connecting member 14 can also be disposed at other positions. Exemplarily, the first connecting member 14 can be disposed corresponding to the edge of the second through hole 1111 to ensure to a certain extent that the impact resistance of the portion of the first conductive member 120 corresponding to the second through hole 1111 is enhanced. For example, the first connecting member 14 is disposed around the second through hole 1111.

[0106] According to some embodiments of the present application, the number of the first connecting members 14 is multiple, and the multiple first connecting members 14 are spaced apart along the second direction y, and the second direction y is perpendicular to the first direction x.

[0107] In some embodiments, the number of the first connecting members 14 is multiple, such as two, three or more. Exemplarily, the number of the first connecting members 14 is two, and the two first connecting members 14 are spaced apart along the second direction y. The second direction y is perpendicular to the first direction x, and the second direction y is perpendicular to the thickness direction z of the first wall. In some embodiments, the housing 11 is square, the first wall 111 is the end cover of the housing 11, the first direction x can be the length direction of the end cover, and the second direction y is the width direction of the end cover.

[0108] Please refer to Figure 9 and Figure 10 , Figure 10Schematic diagram of the first conductive member 120 in some embodiments of the present application. The first connecting member 14 is a riveted structural member arranged on the outer side of the first wall 111. The first conductive member 120 is square, the first direction x is parallel to the length direction of the first conductive member 120, the second direction y is parallel to the width direction of the first conductive member 120, and the first conductive member 120 is provided with a third through hole 1200 corresponding to the riveted structural member. The second through hole 1111 is a circular hole formed in the first wall 111. In order to take into account that the first deformable member 13 can cross the second through hole 1111 to contact the first conductive member 120, the first connecting member 14 constrains the first conductive member 120, and the first connecting member 14 occupies little space, the number of the first connecting members 14 is two, and the two first connecting members 14 are both on the side of the second through hole 1111 away from the first through hole 1110 in the first direction x, and the two first connecting members 14 are arranged at intervals in the second direction y, and the two first connecting members 14 are arranged adjacent to the second through hole 1111.

[0109] In some embodiments, see Figure 10 The first conductive member 120 has a rivet hole 1203 , and the rivet hole 1203 is used for riveting with the first pole 121 .

[0110] In the above scheme, by arranging multiple first connecting members 14 in the second direction y, the reinforcement effect of the first conductive member 120 can be effectively improved, and the risk of the first conductive member 120 being unable to contact with the first deformable member 13 due to excessive deformation due to the internal pressure of the battery cell 10 can be reduced. When the battery cell 10 is in an abuse condition such as overcharging, the first deformable member 13 can effectively contact with the first conductive member 120 to achieve overcharging protection, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0111] According to some embodiments of the present application, the first wall 111 and the first conductive member 120 are riveted together by the first connecting member 14 .

[0112] In some embodiments, the first connecting member 14 is a riveted structural member. Exemplarily, the first connecting member 14 is a riveted structural member disposed on the outer side surface of the first wall 111. The first conductive member 120 is provided with a third through hole 1200 corresponding to the first connecting member 14. During assembly, the first connecting member 14 can pass through the third through hole 1200, and a force is applied to the portion of the first connecting member 14 passing through the third through hole 1200 in the direction from the first conductive member 120 to the first wall 111, so that the portion of the first connecting member 14 passing through the third through hole 1200 is deformed, and the deformed portion can abut against the outer surface of the first conductive member 120, thereby restricting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall. Again, exemplarily, the first connecting member 14 is a riveted structural member disposed on the first conductive member 120, and the first wall 111 is provided with a through hole structure corresponding to the first connecting member 14. During assembly, the first connecting member 14 can pass through the through hole structure, and a force is applied to the portion of the first connecting member 14 passing through the through hole structure in the direction from the first wall 111 to the first conductive member 120, so that the portion of the first connecting member 14 passing through the through hole structure is deformed, such that the radial dimension of the portion of the first connecting member 14 is increased, and the deformed portion can abut against the inner side surface of the first wall 111, thereby restricting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall.

[0113] In the above solution, the first connecting member 14 connects the first wall 111 and the first conductive member 120 by means of riveting, which can reduce the assembly difficulty of the battery cell 10. On the one hand, it enables the first conductive member 120 and the first wall 111 to have good anti-impact ability. On the other hand, the influence of riveting on the first conductive member 120 and the first wall 111 is relatively small, which is conducive to maintaining the structural accuracy of the first conductive member 120 and the first wall 111, so that when the battery cell 10 is in overcharge or other abusive working conditions, the first deformation member 13 effectively contacts the first conductive member 120 to achieve overcharge protection, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery 100.

[0114] In some other embodiments, the manner in which the first wall 111 and the first conductive member 120 are connected by the first connecting member 14 includes but is not limited to welding, snap connection or threaded member connection. Exemplarily, the first connecting member 14 is a welded structure formed by welding; or, the first connecting member 14 is a snap connection structure, so that the first wall 111 and the second conductive member 160 are connected to each other by a snap connection relationship; or the first connecting member 14 is a threaded member, and the first wall 111 and the first conductive member 120 are in threaded cooperation through the first connecting member 14.

[0115] According to some embodiments of the present application, please refer to Figures 8 - 10The first conductive member 120 has a third through hole 1200 , the first connecting member 14 is passed through the third through hole 1200 , one end of the first connecting member 14 is connected to the first wall 111 , and the other end of the first connecting member 14 is formed with a first flange 140 , and the first flange 140 abuts against the first conductive member 120 along the thickness direction z of the first wall.

[0116] The third through hole 1200 is a hole structure that penetrates the first conductive member 120 along the thickness direction z of the first wall. The third through hole 1200 allows the first connecting member 14 to pass through so that the first flange 140 can be located on the side of the first conductive member 120 away from the first wall 111 and abut against the first conductive member 120.

[0117] In some embodiments, one end of the first connector 14 is connected to the first wall 111, and the connection relationship between the first connector 14 and the first wall 111 includes but is not limited to bonding, welding, clamping, screw connection or integral molding. Exemplarily, the first connector 14 is a structural member formed on the outer side of the first wall 111 by a stamping or extrusion process. Alternatively, the first connector 14 is a structural member disposed on the outer side of the first wall 111 by a welding process.

[0118] The first flange 140 is a component formed at one end of the first connector 14 away from the first wall 111. For example, the main body of the first connector 14 is columnar, the lower end of the first connector 14 is connected to the outer side of the first wall 111, and the upper end of the first connector 14 is radially extended outward to form the first flange 140. In some embodiments, the first flange 140 can be arranged around the main body of the first connector 14. In other embodiments, the first flange 140 can be block-shaped, and one or more first flanges 140 are arranged around the circumference of the first connector 14.

[0119] In some embodiments, the first flange 140 and the first connecting member 14 may be separate structures from each other. For example, the first flange 140 may be disposed at the end of the first connecting member 14 by welding, bonding or clamping. In some embodiments, the first flange 140 and the first connecting member 14 may also be an integral structure. Exemplarily, before assembly, the first connecting member 14 is columnar, and the first connecting member 14 can pass through the third through hole 1200. The size of the third through hole 1200 may correspond to the radial size of the first connecting member 14. For example, the third through hole 1200 may be slightly larger than the radial size of the first connecting member 14 to allow the first connecting member 14 to pass through. Apply a force to the portion of the first connecting member 14 passing through the third through hole 1200 in the direction pointing from the first conductive member 120 to the first wall 111, so that the portion of the first connecting member 14 passing through the through hole is deformed to form the first flange 140. The first flange 140 can abut against the outer side surface of the first conductive member 120, thereby restricting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall.

[0120] In the above solution, the third through hole 1200 is provided in the first conductive member 120, so that one end of the first connecting member 14 is connected to the first wall 111, and the other end can pass through the first conductive member 120 to realize the mutual riveting of the first conductive member 120 and the first wall 111, so that the riveting part is located outside the housing 11. Therefore, compared with forming a through hole in the first wall 111 for the first connecting member 14 to pass through, the risk of liquid leakage inside the battery cell 10 can be reduced, and thus the reliability of the battery 100 can be improved.

[0121] According to some embodiments of the present application, please refer to Figure 8 and Figure 10 , a first groove 1201 is formed on the side of the first conductive member 120 facing away from the first wall 111. The third through hole 1200 penetrates the bottom of the first groove 1201, and at least a part of the first flange 140 is located in the first groove 1201.

[0122] The side of the first conductive member 120 facing away from the first wall 111 may be the outer side surface of the first conductive member 120, and the first groove 1201 may be a groove structure formed on the outer side surface of the first conductive member 120. In some embodiments, the shape of the first groove 1201 includes but is not limited to circular, triangular, square or other structures.

[0123] "The third through hole 1200 penetrates through the bottom of the first groove 1201, and at least part of the first flange 140 is located in the first groove 1201" can be understood as that the orifice of the third through hole 1200 is formed at the bottom of the first groove 1201, that is, the orifice of the third through hole 1200 is located between the outer side surface and the inner side surface of the first conductive member 120. The part of the first connecting member 14 passing through the second through hole 1111 can be entirely located in the first groove 1201, or partially located in the first groove 1201, and the remaining part protrudes from the first groove 1201.

[0124] In some embodiments, the side of the first flange 140 facing away from the first wall 111 can be flush with the outer side surface of the first conductive member 120, can be lower than the outer side surface of the first conductive member 120, or can be higher than the outer side surface of the first conductive member 120.

[0125] Exemplarily, the first flange 140 is entirely located in the first groove 1201, and the first flange 140 abuts against the bottom of the first groove 1201. The abutment can be an indirect abutment or a direct abutment. For example, when the first connecting member 14 is made of a metal material, an insulating structure is provided between the first flange 140 and the bottom of the first groove 1201, and the first flange 140 and the bottom of the first groove 1201 can apply a squeezing force to the insulating structure therebetween; alternatively, when the first connecting member 14 is made of a non-metal insulating material, the first flange 140 and the bottom of the first groove 1201 can be in direct contact and abutment.

[0126] In the above solution, by providing the first groove 1201 on the side of the first conductive member 120 facing away from the first wall 111, at least part of the first flange 140 can be accommodated, thereby reducing the space occupied by the first connecting member 14 in the thickness direction z of the first wall, making the battery cell 10 have a compact structure and a high volume energy density.

[0127] According to some embodiments of the present application, please refer to Figure 8 , the battery cell 10 further includes a first insulating member 150, and at least part of the first insulating member 150 is disposed between the first connecting member 14 and the first conductive member 120 for insulating and isolating the first connecting member 14 and the first conductive member 120.

[0128] The first insulating member 150 can be an insulating structure at least partially located between the first connecting member 14 and the first conductive member 120 for insulating and isolating the first connecting member 14 and the first conductive member 120. In some embodiments, the first insulating member 150 can be in a sleeve shape, part of the first insulating member 150 can be located in the first groove 1201, and the other part can be located in the third through hole 1200.

[0129] Exemplarily, a part of the first insulating member 150 may be located between the inner circumferential surface of the first groove 1201 and the outer circumferential surface of the first flange 140, a part of the first insulating member 150 may be located between the first flange 140 and the bottom of the first groove 1201, and another part of the first insulating member 150 may be located between the hole wall of the third through hole 1200 and the main body of the first connecting member 14.

[0130] The first insulating member 150 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, etc. Exemplarily, in some embodiments of the present application, the material of the first insulating member 150 may include insulating PPS (polyphenylene sulfide), polypropylene, or polyethylene.

[0131] In the above solution, by providing the first insulating member 150 between the first connecting member 14 and the first conductive member 120, the risk that the first connecting member 14 conducts the first conductive member 120 and the first wall 111, resulting in an internal short circuit of the battery cell 10, can be reduced, thereby facilitating the improvement of the reliability of the battery 100.

[0132] According to some embodiments of the present application, please refer to Figure 8 and Figure 11 , Figure 11 is a schematic diagram of the first insulating member 150 and the second insulating member 151 in some embodiments of the present application. The battery cell 10 further includes a second insulating member 151, and at least a part of the second insulating member 151 is disposed between the first conductive member 120 and the first wall 111 for insulating and isolating the first conductive member 120 and the first wall 111.

[0133] The second insulating member 151 is an insulating structure at least partially located between the first conductive member 120 and the first wall 111. The second insulating member 151 may be the first insulating structure described above.

[0134] The second insulating member 151 is used for insulating and isolating the first conductive member 120 and the first wall 111. In some embodiments, a part of the second insulating member 151 may be between the inner side surface of the first conductive member 120 and the first wall 111, and another part of the second insulating member 151 may cover at least a part of the outer circumferential surface of the first conductive member 120.

[0135] Refer to Figure 11 , the second insulating member 151 may be formed with a first through hole 1511 and a second through hole 1512. The first through hole 1511 may correspond to the first through hole 1110 for the first pole 121 to pass through. The second through hole 1512 may correspond to the second through hole 1111 for the first deformable member 13 to pass through to contact the first conductive member 120.

[0136] In the above solution, by providing a second insulating member 151 between the first conductive member 120 and the first wall 111, the first conductive member 120 and the first wall 111 can be insulated from each other, thereby reducing the risk of internal short circuit in the battery cell 10, and further facilitating the improvement of the reliability of the battery 100.

[0137] According to some embodiments of the present application, please refer to Figure 11 , the second insulating member 151 is provided with a fourth through hole 1510, and the first connecting member 14 passes through the fourth through hole 1510.

[0138] The fourth through hole 1510 is a hole structure that penetrates the second insulating member 151 along the thickness direction z of the first wall. The fourth through hole 1510 is provided corresponding to the first connecting member 14 and allows the first connecting member 14 to pass through.

[0139] In the above solution, by providing the fourth through hole 1510 for the first connecting member 14 to pass through, the risk of interference between the first connecting member 14 and the second insulating member 151 can be reduced, which is beneficial to the assembly of the battery cell 10 and the improvement of the manufacturing efficiency of the battery cell 10, and further beneficial to the improvement of the manufacturing efficiency of the battery 100.

[0140] According to some embodiments of the present application, the first insulating member 150 and the second insulating member 151 are a split structure with respect to each other, or the first insulating member 150 and the second insulating member 151 are integrally formed.

[0141] In some embodiments, the first insulating member 150 and the second insulating member 151 are independent split structures. For example, during assembly, the first insulating member 150 and the second insulating member 151 are assembled separately. In some embodiments, the first insulating member 150 and the second insulating member 151 are integrally formed structures, and during assembly, the first insulating member 150 and the second insulating member 151 can be assembled simultaneously.

[0142] In the above solution, by setting the first insulating member 150 and the second insulating member 151 as a split structure with respect to each other, the cost of structure manufacturing and maintenance can be reduced, which is beneficial to the cost control of the battery cell 10; by setting the first insulating member 150 and the second insulating member 151 as integrally formed, the assembly process can be simplified, the assembly efficiency of the battery cell 10 can be improved, and the manufacturing efficiency of the battery cell 10 can be improved.

[0143] According to some embodiments of the present application, the first connecting member 14 and the first wall 111 are integrally formed, or the first connecting member 14 is welded to the first wall 111.

[0144] In some embodiments, the first connecting member 14 and the first wall 111 are integrally formed structures. For example, they can be formed on the outer side of the first wall 111 through extrusion or stamping processes, or the first wall 111 with the first connecting member 14 can be obtained through processes such as casting or forging.

[0145] In other embodiments, the first connecting member 14 and the first wall 111 are independent split structures, and the first connecting member 14 can be connected to the first wall 111 by welding.

[0146] In the above solutions, by setting the first connecting member 14 to be integrally formed with the first wall 111, a higher connection stability can be achieved between the first connecting member 14 and the first wall 111. Thus, through the first connecting member 14, a higher structural stability can be obtained between the first wall 111 and the first conductive member 120. By setting the first connecting member 14 to be welded to the first wall 111, the manufacturing difficulty of the first connecting member 14 can be reduced, the manufacturing efficiency of the battery cell 10 can be improved, which is beneficial to the improvement of the manufacturing efficiency of the battery cell 10.

[0147] According to some embodiments of the present application, please refer to Figure 12 and Figure 13 , Figure 12 which are schematic diagrams of the second electrode terminal 16, the first wall 111, and the second deformation member 17 in some embodiments of the present application, Figure 13 which are internal structural schematic diagrams of the second conductive member 160, the first wall 111, and the second connecting member 18 in some embodiments of the present application.

[0148] The battery cell 10 further includes a second conductive member 160, a second pole 161, a second deformation member 17, and a second connecting member 18. The second conductive member 160 is disposed outside the first wall 111 and is insulated from the first wall 111. The second pole 161 is connected to the second conductive member 160. The second deformation member 17 is electrically connected to the first wall 111, and the second deformation member 17 is configured to be deformable to contact the second conductive member 160 to electrically connect the second pole 161 and the first wall 111. The second connecting member 18 connects the second conductive member 160 and the first wall 111.

[0149] In some embodiments, the battery cell 10 further includes a second electrode terminal 16, which is electrically connected to the second pole tab 22 of the electrode assembly 20 and is used to connect to an external current collecting component. The polarity of the second electrode terminal 16 is opposite to that of the first electrode terminal 12, for example, the first electrode terminal 12 is a positive electrode terminal, and the second electrode terminal 16 is a negative electrode terminal. The second electrode terminal 16 is used to be electrically connected to the electrode assembly 20, so that current flows into or out of the second pole tab 22 through the second electrode terminal 16. In some embodiments, the second electrode terminal 16 is made of a metal material, for example, aluminum, copper, iron, steel, alloy or composite metal. In some embodiments, the second electrode terminal 16 can be connected to the second pole tab 22 through a second adapter 220. Exemplarily, the second pole tab 22 of the electrode assembly 20 is composed of a plurality of second sub-pole tabs stacked, and one end of the second adapter 220 can be welded to the second pole tab 22, and then the other end of the second adapter 220 can be welded to the second electrode terminal 16.

[0150] In some embodiments, the second electrode terminal 16 includes a second conductive member 160 and a second pole 161. The second conductive member 160 is located on the side of the first wall 111 away from the electrode assembly 20, and the second conductive member 160 is used to connect to an external busbar component (e.g., a bar sheet). Exemplarily, the second conductive member 160 is welded to the busbar component. The second pole 161 is connected to the second pole ear 22 of the electrode assembly 20, and exemplarily, the second pole 161 is connected to the second pole ear 22 through a second adapter 220. The second conductive member 160 and the second pole 161 are connected to each other, and the connection relationship between the second conductive member 160 and the second pole 161 includes welding, riveting, screw connection, or integral molding, etc. Exemplarily, in some embodiments, the second conductive member 160 and the second pole 161 are riveted to each other, the second conductive member 160 is generally plate-shaped, the second conductive member 160 is formed with a rivet hole, the second pole 161 is generally columnar, such as a cylindrical or polygonal column, etc., a portion of the second pole 161 passes through the fifth through hole 1112 of the first wall 111 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 22 through the second adapter 220.

[0151] In some embodiments, a third insulating structure 153 is disposed between the second conductive member 160 and the first wall 111, and the third insulating structure 153 is used to insulate and isolate the second conductive member 160 from the first wall 111. A fourth insulating structure 154 is disposed between the second pole 161 and the first wall 111, for example, a fourth insulating structure 154 is disposed between the second pole 161 and the fifth through hole 1112 of the first wall 111.

[0152] In some embodiments, the third insulating structure 153 and / or the fourth insulating structure 154 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 third insulating structure 153 and / or the fourth insulating structure 154 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the third insulating structure 153 and / or the fourth insulating structure 154 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0153] In some embodiments, the resistance value of the third insulating structure 153 and / or the fourth insulating structure 154 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 structure and / or the second insulating structure 152 may be greater than or equal to 200 MΩ.

[0154] The second deformable member 17 is mounted on the first wall 111 and is electrically connected to the first wall 111. In some embodiments, the second deformable member 17 may be made of a metal material. For example, the second deformable member 17 is made of aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal. In some embodiments, the second deformable member 17 may be welded to the inner surface of the first wall 111.

[0155] The second deformable member 17 is a structural member that deforms under the internal pressure of the battery cell 10. The second deformable member 17 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 deformable member 17 deforms to contact the second conductive member 160, thereby conducting the first wall 111 and the second electrode terminal 16, causing the positive and negative electrodes inside the battery cell 10 to be short-circuited.

[0156] In some embodiments, the second deformable member 17 may be a flip piece that flips under the action of pressure. Exemplarily, the first wall 111 has a sixth through hole 1113. The edge portion of the second deformable member 17 is welded to the first wall 111, such that the second deformable member 17 closes the sixth through hole 1113. When the internal pressure of the battery cell 10 reaches the second threshold, the second deformable member 17 flips and deforms in the direction facing the first wall 111, thereby passing through the sixth through hole 1113 to contact the second conductive member 160.

[0157] In some embodiments, the first threshold and the second threshold may be equal or unequal.

[0158] 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 deformation member 13 deforms to short-circuit the first electrode terminal 12 and the housing 11. When the internal pressure of the battery cell 10 reaches the second threshold, the second deformation member 17 deforms to short-circuit the second electrode terminal 16 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 fuse the electrical connection components inside the battery cell 10, cut off the charging and discharging circuit of the battery cell 10, and thus play a role in overcharge protection. The fused electrical connection components may include the first adapter 210 and / or the second adapter 220. Exemplarily, the first adapter 210 has a first fusing portion, and when a relatively large current passes through, the first fusing portion can be fused to disconnect the current path between the first tab 21 and the first electrode terminal 12.

[0159] The second connecting member 18 is a structural member connecting the second conductive member 160 and the first wall 111. The second connecting member 18 can be used to restrain the second conductive member 160 and improve the connection stability between the second conductive member 160 and the first wall 111. In some embodiments, the second conductive member 160 deforms under the impact of the increasing internal pressure of the battery cell 10, and the second connecting member 18 can improve the impact resistance of the second conductive member 160 and reduce the magnitude of the deformation of the second conductive member 160. In some embodiments, along the thickness direction z of the first wall, at least a part of the second connecting member 18 can be located between the second conductive member 160 and the first wall 111 so that the second conductive member 160 and the first wall 111 are connected to each other. In other embodiments, a part of the second connecting member 18 can be connected to the second conductive member 160, and another part of the second connecting member 18 can be connected to the outer side surface of the first wall 111. For example, the second connecting member 18 is in a binding strip shape, spanning the outer side surface of the first wall 111 and the outer side surface of the second conductive member 160.

[0160] In some embodiments, the material of the second connecting member 18 includes a non-metal or a metal material. Exemplarily, the second connecting member 18 is a metal material, including but not limited to aluminum, copper, iron, steel, alloy or composite metal. When the second connecting member 18 is a metal material, an insulating structure can be considered to be provided between the second conductive member 160 and the second connecting member 18 to insulate and isolate the second conductive member 160 and the second connecting member 18 and reduce the risk of the second conductive member 160 being electrically connected to the first wall 111 through the second connecting member 18. Alternatively, the second connecting member 18 is a non-metal material, for example, the second connecting member 18 is a plastic material.

[0161] Exemplarily, the second connecting member 18 is a riveting structural member formed on the outer side surface of the first wall 111 by stamping or extrusion, located on the side of the sixth through hole 1113 away from the fifth through hole 1112. The number of the second connecting members 18 is two, and the two second connecting members 18 are spaced apart along the second direction y. The second conductive member 160 is formed with two seventh through holes 1600 corresponding to the two second connecting members 18. The end of the second connecting member 18 passing through the seventh through hole 1600 is formed with a second flange 180, and the second flange 180 abuts against the second conductive member 160, so that the first wall 111 is riveted to the second conductive member 160 through the second connecting member 18.

[0162] Similar to the first connecting member 14 described above, a second groove may be formed on the outer side surface of the second conductive member 160, and the seventh through hole 1600 penetrates the bottom of the second groove. At least a part of the second flange 180 of the second connecting member 18 is located in the first groove 1201. Exemplarily, the side of the second flange away from the first wall 111 is flush with the outer side surface of the second conductive member 160 or is below the outer side surface of the second conductive member 160. In some embodiments, the second connecting member 18 is made of a metal material, and the battery cell 10 further includes a third insulating member 155. At least a part of the third insulating member 155 is disposed between the second connecting member 18 and the second conductive member 160 for insulating and isolating the second connecting member 18 and the second conductive member 160. A part of the third insulating member 155 may be located between the inner circumferential surface of the second groove and the outer circumferential surface of the second flange 180, a part of the third insulating member 155 may be located between the second flange 180 and the bottom of the second groove, and another part of the third insulating member 155 may be located between the hole wall of the seventh through hole 1600 and the main body of the second connecting member 18.

[0163] The third insulating member 155 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 third insulating member 155 may include insulating PPS (polyphenylene sulfide), polypropylene, or polyethylene.

[0164] In the above solution, on the one hand, by providing the second deformable member 17, when the internal pressure of the battery cell 10 reaches a certain level, the second deformable member 17 deforms to contact the second conductive member 160, so that the second terminal post 161 is electrically connected to the first wall 111. In cooperation with the contact between the first deformable member 13 and the first conductive member 120, 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 charging and discharging 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. On the other hand, by providing the second connecting member 18 to connect the second conductive member 160 and the first wall 111, the structural stability between the second conductive member 160 and the first wall 111 can be improved, and the risk that the second conductive member 160 deforms too much due to the internal pressure of the battery cell 10 and cannot contact the second deformable member 17 is reduced. When the battery cell 10 is in an abusive condition such as overcharge, the second deformable member 17 effectively contacts the second conductive member 160 to achieve overcharge protection, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery 100.

[0165] According to some embodiments of the present application, the first terminal post 121 and the second terminal post 161 are spaced apart along the first direction x. Along the first direction x, the first deformable member 13 is located on the side of the first terminal post 121 facing away from the second terminal post 161, and / or the second deformable member 17 is located on the side of the second terminal post 161 facing away from the first terminal post 121.

[0166] The first direction x may be the arrangement direction of the first electrode terminal 12 and the second electrode terminal 16, and the first direction x is perpendicular to the thickness direction z of the first wall. Exemplarily, the first wall 111 is an end cover, the end cover is square, and the first direction x may be the length direction of the end cover.

[0167] "Along the first direction x, the first deformable member 13 is located on the side of the first terminal post 121 facing away from the second terminal post 161" can be understood as that along the first direction x, the first deformable member 13 is away from the middle of the first wall 111 relative to the first terminal post 121, that is, the first deformable member 13 is on the outer side and the first terminal post 121 is on the inner side.

[0168] "The second deformable member 17 is located on the side of the second terminal post 161 facing away from the first terminal post 121" can be understood as that along the first direction x, the second deformable member 17 is away from the middle of the first wall 111 relative to the second terminal post 161, that is, the second deformable member 17 is on the outer side and the second terminal post 161 is on the inner side.

[0169] In some embodiments, the positional relationship of the first deformable member 13, the first pole 121, the second deformable member 17, and the second pole 161 in the first direction x may include the following cases. Case 1: the first deformable member 13, the first pole 121, the second pole 161, and the second deformable member 17; Case 2: the first deformable member 13, the first pole 121, the second deformable member 17, and the second pole 161; Case 3: the first pole 121, the first deformable member 13, the second pole 161, and the second deformable member 17.

[0170] Compared with the case where the pole is outside the corresponding deformable member, in the above solution, by arranging the first deformable member 13 on the side of the first pole 121 away from the second pole 161, and / or arranging the second deformable member 17 on the side of the second pole 161 away from the first pole 121, 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.

[0171] 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. Among them, the box body is used to provide a accommodation space for the battery cell 10, and the box body can adopt various structures.

[0172] 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 by a connecting member (such as a bolt), or each battery cell 10 can be fixed to the box body by bonding.

[0173] According to some embodiments of the present application, an energy storage device is further provided, and the energy storage device includes the battery cell 10 described above.

[0174] In some embodiments, the battery cells 10 can first form the battery 100, and then one or more batteries 100 are 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. The plurality of batteries 100 can be connected in series, parallel, or in a mixed connection with each other.

[0175] 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 then one or more batteries 100 are applied to the electrical device.

[0176] 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.

[0177] According to some embodiments of the present application, a battery cell 10 is provided. Figures 4 - 13 .

[0178] The battery 100 includes a housing 11 , an electrode assembly 20 , a first electrode terminal 12 , a first deformable member 13 , a second electrode terminal 16 , and a second deformable member 17 .

[0179] The housing 11 is square and includes a housing 110 and a first wall 111. A housing cavity is formed inside the housing 110, and the housing cavity is used to accommodate the electrode assembly 20. The housing 110 has an opening connected to the housing cavity. The first wall 111 covers the opening of the housing 110 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and the electrolyte. A fifth insulating structure 156 is provided on the inner side of the first wall 111 to insulate and isolate the first wall 111 from the electrode assembly 20.

[0180] The first electrode terminal 12, the first deformable member 13, the second electrode terminal 16, and the second deformable member 17 are installed on the first wall 111. The first electrode terminal 12 is insulated and isolated from the first wall 111 by an insulating structure, the second electrode terminal 16 is insulated and isolated from the first wall 111 by an insulating structure, and the first deformable member 13 and the second deformable member 17 are respectively welded to the inner side surface of the first wall 111 and are respectively electrically connected to the first wall 111.

[0181] In some embodiments, the first electrode terminal 12 includes a first conductive member 120 and a first pole 121 riveted to each other. The first conductive member 120 is located on the side of the first wall 111 away from the electrode assembly 20, and the first conductive member 120 is used to connect with an external busbar component (such as a bar), and a portion of the first pole 121 is located in the housing 11 and connected to the first pole ear 21 of the electrode assembly 20 through the first adapter 210.

[0182] A second insulating member 151 is disposed between the first conductive member 120 and the first wall 111, and a second insulating structure 152 is disposed between the first pole 121 and the first wall 111. In some embodiments, the first conductive member 120 is square, and the length direction of the first conductive member 120 is the first direction x. Along the first direction x, one end of the first conductive member 120 is connected to the first pole 121, and the other end of the first conductive member 120 is connected to the first wall 111 through the first connector 14.

[0183] The first connector 14 is a riveted structural member formed on the outer side of the first wall 111 by stamping or extrusion. The first conductive member 120 is formed with a third through hole 1200 corresponding to the first connector 14. The first connector 14 passes through the third through hole 1200 and is riveted to the first conductive member 120. In some embodiments, a first insulating member 150 is disposed between the first connector 14 and the first conductive member 120.

[0184] In some embodiments, the second electrode terminal 16 includes a second conductive member 160 and a second pole 161 riveted to each other. The second conductive member 160 is located on the side of the first wall 111 away from the electrode assembly 20, and the second conductive member 160 is used to connect with an external busbar component (such as a bar), and a portion of the second pole 161 is located in the housing 11 and connected to the second pole ear 22 of the electrode assembly 20 through the second adapter 220.

[0185] A third insulating structure 153 is disposed between the second conductive member 160 and the first wall 111, and a fourth insulating structure 154 is disposed between the second pole 161 and the first wall 111. In some embodiments, the second conductive member 160 is square, and the length direction of the second conductive member 160 is the first direction x. Along the first direction x, one end of the second conductive member 160 is connected to the second pole 161, and the other end of the second conductive member 160 is connected to the first wall 111 through the second connector 18.

[0186] The second connector 18 is a riveted structural member formed on the outer side of the first wall 111 by stamping or extrusion. The second conductive member 160 is formed with a seventh through hole 1600 corresponding to the second connector 18. The second connector 18 passes through the seventh through hole 1600 and is riveted to the second conductive member 160. In some embodiments, an insulating structure is provided between the second connector 18 and the second conductive member 160.

[0187] The first deformable member 13 and the second deformable member 17 may be structural members that are deformed by pressure. In some embodiments, the first deformable member 13 and the second deformable member 17 may be flip plates that are flipped by pressure.

[0188] 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 13 deforms, and the first deformable member 13 contacts the first conductive member 120, shorting the first electrode terminal 12 and the housing 11. When the internal pressure of the battery cell 10 reaches the second threshold, the second deformable member 17 deforms, and the second deformable member 17 contacts the second conductive member 160, shorting the second electrode terminal 16 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 instantaneously generated 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 may include the first adapter 210 and / or the second adapter 220. Exemplarily, the first adapter 210 has a first fusing portion, which can cause the first fusing portion to fuse when a relatively large current passes through, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 12.

[0189] In the above solution, by providing the first connecting member 14 to connect the first conductive member 120 and the first wall 111, and providing the second connecting member 18 to connect the second conductive member 160 and the first wall 111, the structural stability between the first conductive member 120 and the first wall 111, and the structural stability between the second conductive member 160 and the first wall 111 can be improved, reducing the risk that the conductive member deforms too much due to the internal pressure of the battery cell 10 and fails to contact the deformable member. When the battery cell 10 is in an abusive working condition such as overcharging, the deformable member effectively contacts the conductive member to achieve overcharge protection, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery 100.

[0190] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. 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; A first pole connected to the first conductive member; a first deformable member electrically connected to the first wall, wherein the first deformable member is configured to be deformable to contact the first conductive member so as to electrically connect the first pole to the first wall; The first connecting member connects the first conductive member and the first wall.

2. The battery cell according to claim 1, characterized in that: The first wall has a first through hole and a second through hole arranged along a first direction, the first pole is passed through the first through hole, and the first deformable member closes the second through hole; Along the first direction, the first connecting member is located on a side of the second through hole away from the first through hole.

3. The battery cell according to claim 2, characterized in that: There are multiple first connecting members, and the multiple first connecting members are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

4. The battery cell according to claim 1, characterized in that: The first wall and the first conductive member are riveted together by the first connecting member.

5. The battery cell according to claim 4, characterized in that: The first conductive member has a third through hole, the first connecting member is passed through the third through hole, one end of the first connecting member is connected to the first wall, and the other end of the first connecting member is formed with a first flange, and along the thickness direction of the first wall, the first flange abuts against the first conductive member.

6. The battery cell according to claim 5, characterized in that: A first groove is formed on a side of the first conductive member facing away from the first wall, the third through hole passes through the bottom of the first groove, and at least a portion of the first flange is located in the first groove.

7. The battery cell according to claim 1, characterized in that: The battery cell further includes a first insulating member, at least a portion of which is disposed between the first connecting member and the first conductive member to insulate and isolate the first connecting member from the first conductive member.

8. The battery cell according to claim 7, characterized in that: The battery cell further includes a second insulating member, at least a portion of which is disposed between the first conductive member and the first wall to insulate and isolate the first conductive member from the first wall.

9. The battery cell according to claim 8, characterized in that: The second insulating member is provided with a fourth through hole, and the first connecting member is passed through the fourth through hole.

10. The battery cell according to claim 8, characterized in that: The first insulating member and the second insulating member are separate structures, or the first insulating member and the second insulating member are integrally formed.

11. The battery cell according to claim 1, characterized in that: The first connecting member is integrally formed with the first wall, or the first connecting member is welded to the first wall.

12. The battery cell according to any one of claims 1 to 11, 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; a second deformable member electrically connected to the first wall, wherein 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; The second connecting member connects the second conductive member and the first wall.

13. The battery cell according to claim 12, 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.

14. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 13.

15. An energy storage device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 13.

16. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 13, wherein the battery cell is used to provide electrical energy.

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