Battery cell, battery, energy storage apparatus, and electrical apparatus

Abstract

The present application discloses a battery cell, a battery, an energy storage apparatus, and an electrical apparatus. The battery cell comprises a casing, a first conductive member, a first pole, a first deformation member, and a first connecting member. The casing has a first wall. The first conductive member is disposed at an outer side of the first wall and is insulated from the first wall. The first pole 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 able to deform to contact the first conductive member, so as to electrically connect the first pole to the first wall. The first connecting member is connected to the first conductive member and the first wall. The technical solutions provided by the present application can improve battery reliability.

Description

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

[0001] This application claims priority to Chinese Patent Application No. 202421174466.9, filed May 27, 2024, entitled “Battery cell, battery, energy storage device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

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

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

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

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

[0006] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, a first conductive member, a first pole, 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 insulated from the first wall. The first pole is connected to the first conductive member. The first deformation member is electrically connected to the first wall, and 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.

[0007] In the above-mentioned 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, the risk that the first conductive member deforms too much to contact the first deformation member due to the internal pressure of the battery cell is reduced, the first deformation member effectively contacts the first conductive member to achieve overcharge protection when the battery cell is in an abuse condition such as overcharge, thereby improving the reliability of the battery cell and further improving the reliability of the battery.

[0008] 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 arranged through the first through hole, and the first deformation member seals the second through hole. Along the first direction, the first connecting member is located on the side of the second through hole away from the first through hole.

[0009] In the above scheme, along the first direction, by arranging the first connecting piece on the side of the first conductive piece away from the first pole, the first electric connecting piece can effectively reinforce the part of the first conductive piece that is prone to deformation under stress, reduce the risk that the first conductive piece deforms too much due to the internal pressure of the battery monomer and cannot contact the first deforming piece, so that the first deforming piece effectively contacts the first conductive piece to achieve overcharge protection when the battery monomer is in an abuse condition such as overcharge, thereby improving the reliability of the battery monomer and further improving the reliability of the battery.

[0010] According to some embodiments of the present application, the number of first connecting pieces is multiple, and the multiple first connecting pieces are arranged in the second direction and perpendicular to the first direction.

[0011] In the above scheme, by arranging multiple first connecting pieces in the second direction, the reinforcing effect on the first conductive piece can be effectively improved, the risk that the first conductive piece deforms too much due to the internal pressure of the battery monomer and cannot contact the first deforming piece can be reduced, so that the first deforming piece effectively contacts the first conductive piece to achieve overcharge protection when the battery monomer is in an abuse condition such as overcharge, thereby improving the reliability of the battery monomer and further improving the reliability of the battery.

[0012] According to some embodiments of the present application, the first wall and the first conductive piece are riveted through the first connecting piece.

[0013] In the above scheme, the first connecting piece connects the first wall and the first conductive piece in a riveting manner, which can reduce the assembly difficulty of the battery monomer. On the one hand, the first conductive piece and the first wall have good impact resistance, and on the other hand, riveting has little effect on the first conductive piece and the first wall, which is beneficial to maintaining the structural precision of the first conductive piece and the first wall. When the battery monomer is in an abuse condition such as overcharge, the first deforming piece effectively contacts the first conductive piece to achieve overcharge protection, thereby improving the reliability of the battery monomer and further improving the reliability of the battery.

[0014] According to some embodiments of the present application, the first conductive piece has a third through hole, the first connecting piece is arranged in the third through hole, one end of the first connecting piece is connected with the first wall, the other end of the first connecting piece forms a first flange, and along the thickness direction of the first wall, the first flange abuts against the first conductive piece.

[0015] In the above scheme, the third through hole is arranged on the first conductive piece, so that one end of the first connecting piece is connected with the first wall and the other end can pass through the first conductive piece to realize riveting of the first conductive piece and the first wall. Therefore, the riveting part is located on the outside of the shell, so compared with forming a through hole in the first wall for the first connecting piece to pass through, the risk of internal liquid leakage of the battery monomer can be reduced, thereby improving the reliability of the battery.

[0016] According to some embodiments of the present application, the first conductive member is provided with a first groove on a side facing away from the first wall, and the third through hole penetrates a groove bottom of the first groove, and at least part of the first flange is located in the first groove.

[0017] In the above scheme, by providing the first groove on the side of the first conductive member facing away from the first wall, at least part of the first flange can be accommodated, thereby reducing the occupation of space in the thickness direction of the first wall by the first connecting member, making the battery monomer structure compact and having high volumetric energy density.

[0018] According to some embodiments of the present application, the battery monomer further comprises a first insulating member, at least part of the first insulating member is arranged between the first connecting member and the first conductive member, for insulating and isolating the first connecting member and the first conductive member.

[0019] In the above scheme, by arranging the first insulating member between the first connecting member and the first conductive member, the risk of internal short circuit of the battery monomer caused by the first connecting member conducting the first conductive member and the first wall can be reduced, thereby facilitating the improvement of battery reliability.

[0020] According to some embodiments of the present application, the battery monomer further comprises a second insulating member, at least part of the second insulating member is arranged between the first conductive member and the first wall, for insulating and isolating the first conductive member and the first wall.

[0021] In the above scheme, by arranging 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 internal short circuit of the battery monomer, and facilitating the improvement of battery reliability.

[0022] According to some embodiments of the present application, the second insulating member is provided with a fourth through hole, and the first connecting member is arranged through the fourth through hole.

[0023] In the above scheme, by arranging the fourth through hole for the first connecting member to pass through, the risk of mutual interference between the first connecting member and the second insulating member can be reduced, facilitating the assembly of the battery monomer, improving the manufacturing efficiency of the battery monomer, and further improving the manufacturing efficiency of the battery.

[0024] According to some embodiments of the present application, the first insulating member and the second insulating member are in a split structure, or the first insulating member and the second insulating member are integrally formed.

[0025] In the above scheme, by arranging the first insulating member and the second insulating member in a split structure, the cost of structure manufacturing and maintenance can be reduced, and the cost of the battery monomer can be controlled; by arranging 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 monomer can be improved, and the manufacturing efficiency of the battery monomer can be improved.

[0026] According to some embodiments of the present application, the first connecting piece is integrally formed with the first wall, or the first connecting piece is welded to the first wall.

[0027] In the above scheme, by setting the first connecting piece to be integrally formed with the first wall, the connection stability between the first connecting piece and the first wall can be higher, so that the structural stability between the first wall and the first conductive piece can be higher through the first connecting piece. By setting the first connecting piece to be welded to the first wall, the manufacturing difficulty of the first connecting piece can be reduced, the manufacturing efficiency of the battery monomer can be improved, and the improvement of the manufacturing efficiency of the battery monomer is facilitated.

[0028] According to some embodiments of the present application, the battery monomer further comprises a second conductive piece, a second pole, a second deformation piece and a second connecting piece. The second conductive piece is arranged outside the first wall and insulated from the first wall. The second pole is connected with the second conductive piece. The second deformation piece is electrically connected with the first wall, and is configured to be deformable to contact the second conductive piece to electrically connect the second pole with the first wall. The second connecting piece connects the second conductive piece and the first wall.

[0029] In the above scheme, on the one hand, by setting the second deformation piece, when the internal pressure of the battery monomer reaches a certain degree, the second deformation piece deforms to contact the second conductive piece, so that the second pole is electrically connected with the first wall, and the first deformation piece contacts the first conductive piece, so that the electrical connection member in the battery monomer is fused due to the large current generated by short circuit, so as to cut off the charging and discharging circuit of the battery monomer, thereby playing a role of overcharge protection and reducing the risk of thermal runaway of the battery monomer, thereby improving the reliability of the battery.

[0030] According to some embodiments of the present application, the first pole and the second pole are arranged at intervals along the first direction, and along the first direction, the first deformation piece is located on the side of the first pole away from the second pole, and / or the second deformation piece is located on the side of the second pole away from the first pole.

[0031] In the above scheme, compared with the pole being located on the outside of the corresponding deformation piece, by setting the first deformation piece to be located on the side of the first pole away from the second pole, and / or the second deformation piece to be located on the side of the second pole away from the first pole, the propagation path of the internal current of the battery monomer can be shortened, the internal resistance of the battery monomer can be reduced, and the charging and discharging performance of the battery can be improved.

[0032] In a second aspect, some embodiments of the present application further provide a battery, the battery comprising the battery cell provided in the first aspect.

[0033] In a third aspect, some embodiments of the present application further provide an energy storage device, the energy storage device comprising the battery cell provided in the first aspect.

[0034] In a fourth aspect, some embodiments of the present application further provide an electric device, the electric device comprising the battery cell provided in the first aspect, the battery cell being configured to provide electric energy.

[0035] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0037] FIG. 1 is a schematic view of a vehicle in some embodiments of the present application;

[0038] FIG. 2 is a schematic view of an energy storage device in some embodiments of the present application;

[0039] FIG. 3 is an exploded view of a battery in some embodiments of the present application;

[0040] FIG. 4 is an exploded view of a battery cell in some embodiments of the present application;

[0041] FIG. 5 is an exploded view of a partial structure of a battery cell in some embodiments of the present application;

[0042] FIG. 6 is an internal schematic view of a partial structure of a battery cell in some embodiments of the present application;

[0043] FIG. 7 is a schematic view of a first electrode terminal, a first wall and a first deformation member in some embodiments of the present application;

[0044] FIG. 8 is an internal structure schematic view of a first conductive member, a first wall and a first connecting member in some embodiments of the present application;

[0045] FIG. 9 is a schematic view of a first wall and a first connecting member in some embodiments of the present application;

[0046] FIG. 10 is a schematic view of a first conductive member in some embodiments of the present application;

[0047] Fig. 11 is a schematic view of the first insulating member and the second insulating member in some embodiments of the present application;

[0048] Fig. 12 is a schematic view of the second electrode terminal, the first wall and the second deformation member in some embodiments of the present application;

[0049] Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application.

[0050] Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. Fig. 13 is a schematic view of the internal structure of the second conductive member, the first wall and the second connecting member in some embodiments of the present application. DETAILED DESCRIPTION

[0051] 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 more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0054] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, the technical terms "top", "bottom", "inner", "outer", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cuboid or other shapes, etc. The present application embodiments are not limited thereto. The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a case for packaging one or more battery cells. The case can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0060] 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 relies on the movement (e.g. deintercalation) of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure a certain degree of safety when passing a large current 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 present application embodiments are not limited thereto.

[0061] The battery cell also includes a housing, and the electrode assembly and the electrolyte are arranged inside the housing. The housing has a first wall, the first wall is provided with an electrode terminal, the electrode terminal is connected with the electrode assembly, and the electrode terminal is used for input and output of electric energy. In some embodiments, the electrode terminal includes a conductive piece and a pole connected with each other, the conductive piece is located on the outside of the first wall and is used for connecting with an external bus component to realize input and output of electric energy, and the pole is connected with the tabs of the electrode assembly directly or indirectly.

[0062] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0063] To reduce the risk of thermal runaway of the battery cell under abuse conditions such as overcharge, some battery cells currently have an overcharge protection structure. Exemplarily, the overcharge protection structure includes a deformation piece that is electrically connected to the shell. Under abuse conditions such as overcharge, when the internal pressure of the battery cell increases to a certain extent, the deformation piece deforms under the action of the internal pressure to contact the electrode terminal, for example, to be connected to the conductive piece, so that the shell is short-circuited with the electrode terminal, the positive and negative electrodes of the battery cell are short-circuited to cause internal short circuit of the battery cell, and the electrical connection member in the battery cell is fused due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell, and playing a role of overcharge protection.

[0064] However, when the internal pressure of the battery cell increases to cause the internal expansion of the battery cell, the conductive piece is prone to deformation or misplacement, so that the deformation piece cannot contact the conductive piece, resulting in failure of the overcharge protection and affecting the reliability of the battery.

[0065] In view of this, to improve the problem that the deformation piece cannot contact the conductive piece due to the deformation or misplacement of the conductive piece, resulting in failure of the overcharge protection and affecting the reliability of the battery, some embodiments of the present application provide a battery cell. The battery cell includes a shell, a first conductive piece, a first pole, a first deformation piece, and a first connecting piece. The shell has a first wall. The first conductive piece is disposed outside the first wall and insulated from the first wall. The first pole is connected to the first conductive piece. The first deformation piece is electrically connected to the first wall, and the first deformation piece is configured to be deformable to contact the first conductive piece to electrically connect the first pole and the first wall. The first connecting piece connects the first conductive piece and the first wall.

[0066] In the above scheme, by providing the first connecting piece to connect the first conductive piece and the first wall, the structural stability between the first conductive piece and the first wall can be improved, the risk that the first conductive piece is deformed too much to contact the first deformation piece due to the internal pressure of the battery cell can be reduced, the first deformation piece can effectively contact the first conductive piece to achieve overcharge protection when the battery cell is under abuse conditions such as overcharge, and thus the reliability of the battery cell can be improved, and the reliability of the battery can be further improved.

[0067] The technical solutions described in the embodiments of the present application are applicable to batteries, energy storage devices using batteries, and electric devices using batteries.

[0068] The energy storage device can include an energy storage container, an energy storage cabinet, etc. Exemplarily, the energy storage cabinet can include a cabinet body and one or more batteries disposed on the cabinet body.

[0069] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The electric device in the embodiments of the present application includes but is not limited to the above-mentioned.

[0070] The following embodiments are described for convenience with the electric device being a vehicle as an example.

[0071] FIG. 1 is a schematic diagram of a vehicle in some embodiments of the present application.

[0072] The vehicle 1000 can be provided with a controller 200, a motor 300, and a battery 100. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000, and is used for the circuit system of the vehicle 1000, such as the power demand for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Referring to FIG. 2, FIG. 2 is a schematic diagram of an energy storage device in some embodiments of the present application.

[0074] The energy storage device 2000 can include a cabinet 2001 and a plurality of batteries 100. The plurality of batteries 100 can be arranged in the cabinet 2001. The plurality of batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0075] Referring to FIG. 3, FIG. 3 is a perspective exploded view of the battery 100 in some embodiments of the present application.

[0076] The battery 100 includes the battery cell 10 and a case 30 in which the battery cell 10 is accommodated. The case 30 is configured to provide an accommodation space for the battery cell 10, and can have various structures. In some embodiments, the case 30 can include a first case portion 31 and a second case portion 32, the first case portion 31 and the second case portion 32 being coupled to each other to define the accommodation space for the battery cell 10. The second case portion 32 can be a hollow structure with one open end, and the first case portion 31 can be a plate structure, the first case portion 31 being coupled to the open end of the second case portion 32 to define the accommodation space together with the second case portion 32. Alternatively, the first case portion 31 and the second case portion 32 can each be a hollow structure with one open end, the open end of the first case portion 31 being coupled to the open end of the second case portion 32. Of course, the case 30 formed by the first case portion 31 and the second case portion 32 can have various shapes, such as a cylindrical shape, a cuboid shape, etc.

[0077] In the battery 100, the battery cell 10 can be one or a plurality of battery cells, and each battery cell 10 can be fixed to the case 30 by a connecting member (e.g., a bolt), or each battery cell 10 can be fixed to the case 30 by adhesion.

[0078] Some embodiments of the present application provide a battery cell 10, as shown in FIGS. 4-8. FIG. 4 is a perspective exploded view of the battery cell 10 according to some embodiments of the present application, FIG. 5 is a perspective view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 6 is an internal schematic view of a partial structure of the battery cell 10 according to some embodiments of the present application, FIG. 7 is a schematic view of a first electrode terminal 12, a first wall 111, and a first deformation member 13 according to some embodiments of the present application, and FIG. 8 is a schematic view of an internal structure of a first conductive member 120, the first wall 111, and a first connecting member 14 according to some embodiments of the present application.

[0079] 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 is configured to be deformable to contact the first conductive member 120 to electrically connect the first pole 121 to the first wall 111. The first connecting member 14 connects the first conductive member 120 and the first wall 111.

[0080] The shell 11 is used to accommodate the electrode assembly 20, and can also be used to accommodate an electrolyte, such as an electrolyte solution. Referring to FIG. 4, in some embodiments, the shell 11 includes a shell body 110 and an end cover. The shell body 110 has an accommodating cavity formed therein for accommodating the electrode assembly 20, and has an opening communicating with the accommodating cavity. The end cover is coupled to the opening of the shell body 110 and forms a sealed connection therewith to form a sealed space for accommodating the electrode assembly 20 and the electrolyte. The end cover can be coupled to the shell body 110 by welding, bonding, clamping or other coupling manners. Optionally, the shell 11 can also include a bottom plate, and the shell body 110 has two openings formed at two ends thereof, one of which is closed by the end cover and the other of which is closed by the bottom plate.

[0081] In some embodiments, the shell 11 can be made of metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. For another example, part of the shell 11 can be made of metal, and the rest of the shell 11 can be made of non-metal. For example, the end cover of the shell 11 can be made of metal, and the shell body 110 or other parts of the shell 11 can be made of non-metal.

[0082] In some embodiments, the electrode assembly 20 can be placed into the shell body 110, and the shell body 110 can be filled with the electrolyte before the end cover is coupled to the opening of the shell body 110 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, the electrode assembly 20 can be placed into the shell body 110, and the end cover can be coupled to the opening of the shell body 110 before the shell body 110 is filled with the electrolyte through a filling hole in the end cover. The filling hole can be closed after the shell body 110 is filled with the electrolyte to complete the assembly of the battery cell 10.

[0083] The shell 11 can have various shapes, such as a cylindrical shape or a prismatic shape. The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 has a cylindrical shape, the shell 11 can also have a cylindrical shape. If the electrode assembly 20 has a flat shape, the shell 11 can have a square shape.

[0084] The first wall 111 is part of the shell 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 electric energy. In some embodiments, the first wall 111 can be part of the shell body 110, such as a side wall or a bottom wall of the shell body 110. In some embodiments, the first wall 111 can be the end cover.

[0085] The first electrode terminal 12 is a component mounted to the first wall 111, and is used to electrically connect with the electrode assembly 20, so as to make current flow into or out of the first tab 21 through the first electrode terminal 12. The first electrode terminal 12 and the first tab 21 have the same polarity. In some embodiments, the first electrode terminal 12 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 12 can be connected with the first tab 21 through a first adapter 210. For example, the first tab 21 of the electrode assembly 20 is composed of a plurality of first sub-tabs stacked together, and then one end of the first adapter 210 is welded to the first tab 21, and the other end of the first adapter 210 is welded to the first electrode terminal 12.

[0086] In some embodiments, the first electrode terminal 12 includes a first conductive piece 120 and a first pole 121. The first conductive piece 120 is located on the side of the first wall 111 away from the electrode assembly 20, and is used to connect with an external busbar component (such as a busbar). For example, the first conductive piece 120 is welded to the busbar component. The first pole 121 is connected with the first tab 21 of the electrode assembly 20, and is connected with the first tab 21 through the first adapter 210, for example. The first conductive piece 120 and the first pole 121 are connected with each other, and the connection relationship between the first conductive piece 120 and the first pole 121 includes welding, riveting, threaded connection or one-piece forming, etc. For example, in some embodiments, the first conductive piece 120 and the first pole 121 are riveted to each other, the first conductive piece 120 is generally plate-shaped, the first conductive piece 120 is formed with a riveting hole, the first pole 121 is generally columnar, such as cylindrical or polygonal columnar, etc., a part of the first pole 121 passes through the first through hole 1110 of the first wall 111 and is riveted in the riveting hole, and the other part is located in the housing 11 and is connected with the first tab 21 through the first adapter 210.

[0087] In some embodiments, a first insulating structure is arranged between the first conductive piece 120 and the first wall 111, and is used to insulate and isolate the first conductive piece 120 and the first wall 111. A second insulating structure 152 is arranged between the first pole 121 and the first wall 111, such as between the outer periphery of the first pole 121 and the hole wall of the first through hole 1110.

[0088] In some embodiments, the first and / or second insulation structure 152 can be made of a material with a high resistance value, such as an organic insulation material, an inorganic insulation material, or a hybrid insulation material. For example, in some embodiments of the present application, the first and / or second insulation structure 152 can be made of an insulation PPS (polyphenylene sulfide) material. In other embodiments, the first and / or second insulation structure 152 can also be made of polypropylene, polyethylene, or other materials with insulation properties.

[0089] In some embodiments, the first and / or second insulation structure 152 can have a resistance value in units of mega-ohms (MΩ). For example, in some embodiments of the battery cell 10 provided by the present application, the first and / or second insulation structure 152 can have a resistance value greater than or equal to 200 MΩ.

[0090] The first deformation member 13 is mounted to the first wall 111 and electrically connected to the first wall 111. In some embodiments, the first deformation member 13 can be made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal. In some embodiments, the first deformation member 13 can be welded to the inner side of the first wall 111.

[0091] The first deformation member 13 is a structure that deforms under the internal pressure of the battery cell 10. The first deformation member 13 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an overcharge or other abuse condition, the internal pressure increases, and when the internal pressure reaches a certain level, such as a first threshold value, the first deformation member 13 deforms to contact the first electrode terminal 12, such as the first conductive member 120, thereby connecting the first wall 111 and the first electrode terminal 12, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0092] In some embodiments, the first deformation member 13 can be a flip piece that flips under pressure. For example, the flip piece has a disc-shaped outer contour and includes, from the outside to the inside, a skirt, a flip foil, and an electrical connection portion connected in sequence. The skirt can be connected to the first wall 111, and the flip foil has a small thickness and is used to deform and flip under pressure. After the flip foil flips, the electrical connection portion can be pushed towards the first conductive member 120 of the first electrode terminal 12, so that the electrical connection portion contacts the first conductive member 120.

[0093] Exemplarily, the first conductive member 120 is in a long strip shape, and has a large size in the first direction x. The first wall 111 has a first through hole 1110 and a second through hole 1111, which are arranged at intervals along the first direction x. The first pole post 121 is connected to the first conductive member 120 through the first through hole 1110. Along the first direction x, the first deformation member 13 is located on one side of the first pole post 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. The flip foil is in a collapsed state in a direction away from the first wall 111 in a natural state, and is flipped in a direction facing the first wall 111 when the internal pressure of the battery monomer 10 reaches the first threshold value, so as to push the electrical connection part to make the electrical connection part contact the first conductive member 120 through the second through hole 1111.

[0094] In some embodiments, the first pole post 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 shell 11. The second tab 22 is opposite in polarity to the first tab 21. The second tab 22 is directly or through the second adapter 220 connected to the shell 11, or a second electrode terminal 16 is arranged on the shell 11 and is electrically connected to the shell 11. 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 monomer 10 reaches the first threshold value, the first deformation member 13 deforms to short the first electrode terminal 12 and the shell 11, so that the positive and negative electrodes inside the battery monomer 10 are short-circuited to cause internal short circuit, and a large current generated instantaneously can melt the electrical connection member inside the battery monomer 10 to cut off the charging and discharging circuit of the battery monomer 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 210 and / or the second adapter 220. Exemplarily, the first adapter 210 has a first melting portion, and the thickness or width dimension of the first melting portion can be smaller than that of the rest of the first adapter 210, so that the first melting portion can be melted when a large current passes through, thereby breaking the current path of the first tab 21 and the first electrode terminal 12. Exemplarily, the second adapter 220 has a second melting portion, so that the second melting portion can be melted when a large current passes through, thereby breaking the current path of the second tab 22 and the second electrode terminal 16 or the shell 11.

[0095] In some embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 through a first adapter 210, the second tab 22 of the electrode assembly 20 can be electrically connected to a second electrode terminal 16, the second tab 22 is opposite in polarity to the first tab 21, the second electrode terminal 16 can be insulated mounted to the housing 11, for example, insulated mounted to the first wall 111 of the housing 11. The second tab 22 can be electrically connected to the second electrode terminal 16 through a 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 used to be deformed to contact the second electrode terminal 16 when the internal pressure of the battery cell 10 reaches a second threshold value, so as to electrically connect the second electrode terminal 16 with the housing 11.

[0096] When the internal pressure of the battery cell 10 reaches a certain degree, for example, the first threshold value, the first deformation member 13 deforms to contact the first conductive member 120, so as to short the first electrode terminal 12 and the housing 11, when the internal pressure of the battery cell 10 reaches the second threshold value, the second deformation member 17 deforms to short the second electrode terminal 16 with the housing 11, so as to short the positive and negative electrodes inside the battery cell 10 to cause internal short circuit, the large current generated instantaneously can melt the electrical connection member inside the battery cell 10, so as to cut off the charging and discharging circuit of the battery cell 10, thereby playing the role of overcharge protection. The melted electrical connection member can include the first adapter 210 and / or the second adapter 220. For example, the first adapter 210 has a first melting portion, when a larger current passes through, the first melting portion can be melted, so as to break the current path of the first tab 21 and the first electrode terminal 12. For example, the second adapter 220 has a second melting portion, when a larger current passes through, the second melting portion can be melted, so as to break the current path of the second tab 22 and the second electrode terminal 16.

[0097] 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 constrain the first conductive member 120, so as to improve the connection stability between the first conductive member 120 and the first wall 111. In some embodiments, the first conductive member 120 is deformed under 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, so as to reduce the deformation of the first conductive member 120. In some embodiments, at least part of the first connecting member 14 can be between the first conductive member 120 and the first wall 111 along the thickness direction z of the first wall, so as to connect the first conductive member 120 and the first wall 111 to each other. In other embodiments, part of the first connecting member 14 can be connected to the first conductive member 120, another part of the first connecting member 14 can be connected to the outer side of the first wall 111, for example, the first connecting member 14 is in the form of a restraint band, which spans the outer side of the first wall 111 and the outer side of the first conductive member 120.

[0098] In some embodiments, the material of the first connecting member 14 includes a non-metallic material or a metallic material. For example, the first connecting member 14 is made of a metallic material, such as aluminum, copper, iron, steel, an alloy, or a composite metal. When the first connecting member 14 is made of a metallic material, an insulating structure can be arranged between the first conducting member 120 and the first connecting member 14 to insulate the first conducting member 120 and the first connecting member 14, thereby reducing the risk that the first conducting member 120 is electrically connected to the first wall 111 through the first connecting member 14. Alternatively, the first connecting member 14 is made of a non-metallic material, such as a plastic material.

[0099] In the above scheme, the first connecting member 14 is arranged to connect the first conducting member 120 and the first wall 111, thereby improving the structural stability between the first conducting member 120 and the first wall 111, reducing the risk that the first conducting member 120 is deformed too much to contact the first deforming member 13 due to the internal pressure of the battery monomer 10, and enabling the first deforming member 13 to effectively contact the first conducting member 120 to achieve overcharge protection when the battery monomer 10 is subjected to abuse conditions such as overcharge, thereby improving the reliability of the battery monomer 10 and further improving the reliability of the battery 100.

[0100] According to some embodiments of the present application, referring to FIG. 9, which is a schematic view 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 a first direction x. The first pole 121 passes through the first through hole 1110, and the first deforming 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.

[0101] The first direction x can be the arrangement direction of the first pole 121 and the first deforming member 13, and the first direction x is perpendicular to the thickness direction z of the first wall. In some embodiments, the shell 11 is square-shaped, the first wall 111 is an end cover of the shell 11, and the first direction x can be the length direction of the end cover.

[0102] 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, a circle, a square, a triangle, or other shapes. In some embodiments, a portion of the first pole post 121 is located inside the first wall 111, a portion of the first pole post 121 is located in the first through hole 1110, and another portion of the first pole post 121 is located outside the first wall 111 and connected to the first conductive member 120. For example, a portion of the first pole post 121 is located inside the first wall 111, and the other portion passes through the first through hole 1110 and is riveted to the first conductive member 120, so that the first wall 111 is clamped by the first pole post 121 and the first conductive member 120 along the thickness direction z of the first wall. Insulation structures are respectively provided between the first pole post 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.

[0103] 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, a circle, a square, a triangle, or other shapes. Along the first direction x, the first deformable member 13 is located on one side of the first electrode post 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 deformable member 13 is welded to the inner surface of the first wall 111, and the portion of the first deformable member 13 used for deformation to contact the first conductive member 120 is directly opposite 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 deformable member 13 can pass through the second through hole 1111 and contact the first conductive member 120.

[0104] The phrase "along the first direction x, the first connector 14 is located on the side of the second through hole 1111 away from the first through hole 1110" can be understood as the part of the first connector 14 that constrains the first conductive element 120 and the first wall 111 being located on the side of the second through hole 1111 away from the first through hole 1110. For example, the first connector 14 is a riveting post, and along the first direction x, the first pole post 121 is located on one side of the second through hole 1111, while the riveting post is located on the other side of the second through hole 1111.

[0105] In the above scheme, along the first direction x, by arranging the first connecting member 14 on the side of the first conductive member 120 away from the first pole 121, the first electric connecting member can effectively reinforce the position of the first conductive member 120 that is prone to deformation under stress, and reduce the risk that the first conductive member 120 deforms too much due to internal pressure of the battery monomer 10, so that the first deforming member 13 effectively contacts the first conductive member 120 to achieve overcharge protection when the battery monomer 10 is in an abuse condition such as overcharge, thereby improving the reliability of the battery monomer 10 and further improving the reliability of the battery 100.

[0106] In some embodiments, the first connecting member 14 can also be arranged at other positions. For example, the first connecting member 14 can be arranged around the second through hole 1111 to ensure that the impact resistance of the part of the first conductive member 120 corresponding to the second through hole 1111 is enhanced to a certain extent.

[0107] According to some embodiments of the present application, the number of first connecting members 14 is multiple, and the multiple first connecting members 14 are arranged at intervals along the second direction y, which is perpendicular to the first direction x.

[0108] In some embodiments, the number of first connecting members 14 is multiple, for example, two, three or more. For example, the number of first connecting members 14 is two, and the two first connecting members 14 are arranged at intervals 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 shell 11 is square, the first wall 111 is an end cover of the shell 11, and 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.

[0109] Please refer to FIG. 9 and FIG. 10, and FIG. 10 is a schematic diagram of the first conductive member 120 in some embodiments of the present application. The first connecting member 14 is a riveting structure 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, the first conductive member 120 is provided with a third through hole 1200 corresponding to the riveting structure, and the second through hole 1111 is a circular hole formed in the first wall 111. In order to consider that the first deforming member 13 can contact the first conductive member 120 by passing through the second through hole 1111, the constraint of the first connecting member 14 on the first conductive member 120 and the small space occupation of the first connecting member 14, the number of the first connecting member 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 in the second direction y, the two first connecting members 14 are arranged in a spaced manner, and the two first connecting members 14 are arranged adjacent to the second through hole 1111.

[0110] In some embodiments, referring to FIG. 10, the first conductive member 120 has a riveting hole 1203 for riveting with the first pole 121.

[0111] In the above scheme, by arranging multiple first connecting members 14 in the second direction y, the reinforcing effect on the first conductive member 120 can be effectively improved, and the risk that the first conductive member 120 is deformed too much to contact the first deforming member 13 due to the internal pressure of the battery monomer 10 is reduced. The first deforming member 13 effectively contacts the first conductive member 120 to achieve overcharge protection when the battery monomer 10 is in an abuse working condition such as overcharge, thereby improving the reliability of the battery monomer 10 and further improving the reliability of the battery 100.

[0112] According to some embodiments of the present application, the first wall 111 and the first conductive member 120 are riveted by the first connecting member 14.

[0113] In some embodiments, the first connecting member 14 is a riveting structure, and the first connecting member 14 is a riveting structure arranged on the outer side of the first wall 111, and the first conductive member 120 is provided with a third through hole 1200 corresponding to the first connecting member 14. In assembly, the first connecting member 14 can pass through the third through hole 1200, and a force in the direction of the first conductive member 120 pointing to the first wall 111 is applied to the part of the first connecting member 14 passing through the third through hole 1200, so that the part of the first connecting member 14 passing through the third through hole 1200 is deformed, and the deformed part can abut against the outer surface of the first conductive member 120, thereby limiting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall. In another example, the first connecting member 14 is a riveting structure arranged 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. In assembly, the first connecting member 14 can pass through the through hole structure, and a force in the direction of the first wall 111 pointing to the first conductive member 120 is applied to the part of the first connecting member 14 passing through the through hole structure, so that the part of the first connecting member 14 passing through the through hole structure is deformed, and the radial dimension of the deformed part of the first connecting member 14 is increased, and the deformed part can abut against the inner side of the first wall 111, thereby limiting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall.

[0114] In the above scheme, the first connecting member 14 connects the first wall 111 and the first conductive member 120 in a riveting manner, which can reduce the assembly difficulty of the battery monomer 10. On the one hand, the first conductive member 120 and the first wall 111 have good impact resistance, and on the other hand, the riveting has little effect on the first conductive member 120 and the first wall 111, which is beneficial to maintaining the structural precision of the first conductive member 120 and the first wall 111. In the overcharge and other abuse conditions of the battery monomer 10, the first deformed member 13 effectively contacts the first conductive member 120 to achieve overcharge protection, thereby improving the reliability of the battery monomer 10 and further improving the reliability of the battery 100.

[0115] In other embodiments, the connection of the first wall 111 and the first conductive member 120 by the first connecting member 14 includes but is not limited to welding, clamping or threaded connection. In an example, the first connecting member 14 is a welding structure formed by welding; or the first connecting member 14 is a clamping structure, so that the first wall 111 and the second conductive member 160 are connected to each other in a clamping connection relationship; or the first connecting member 14 is a threaded member, and the first wall 111 and the first conductive member 120 are threadedly connected through the first connecting member 14.

[0116] According to some embodiments of the present application, please refer to FIG. 8-10. The first conductive member 120 has a third through hole 1200, the first connecting member 14 is inserted through the third through hole 1200, one end of the first connecting member 14 is connected with the first wall 111, and the other end of the first connecting member 14 is formed with a first flange 140, which abuts against the first conductive member 120 along the thickness direction z of the first wall.

[0117] The third through hole 1200 is a hole structure penetrating the first conductive member 120 along the thickness direction z of the first wall, and the first connecting member 14 is inserted through the third through hole 1200, 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.

[0118] In some embodiments, one end of the first connecting member 14 is connected with the first wall 111, and the connection relationship between the first connecting member 14 and the first wall 111 includes but is not limited to bonding, welding, clamping, threaded connection or integral forming. For example, the first connecting member 14 is a structural member formed on the outer side of the first wall 111 by a stamping or extrusion process. Alternatively, the first connecting member 14 is a structural member provided on the outer side of the first wall 111 by a welding process.

[0119] The first flange 140 is a component formed on the end of the first connecting member 14 away from the first wall 111. For example, the main body of the first connecting member 14 is columnar, the lower end of the first connecting member 14 is connected with the outer side of the first wall 111, and the upper end of the first connecting member 14 expands radially outward to form the first flange 140. In some embodiments, the first flange 140 can be arranged around the main body of the first connecting member 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 connecting member 14.

[0120] In some embodiments, the first flange 140 and the first connecting member 14 can be separate structures, for example, the first flange 140 can be arranged at the end of the first connecting member 14 by welding, bonding or clamping, and in some embodiments, the first flange 140 and the first connecting member 14 can also be an integral structure. For example, before assembly, the first connecting member 14 is in a columnar shape, the first connecting member 14 can pass through the third through hole 1200, the size of the third through hole 1200 can correspond to the radial size of the first connecting member 14, for example, the third through hole 1200 can be slightly larger than the radial size of the first connecting member 14, so as to allow the first connecting member 14 to pass through. A force is applied to the part of the first connecting member 14 passing through the third through hole 1200 in the direction of the first conductive member 120 pointing to the first wall 111, so that the part of the first connecting member 14 passing through the through hole is deformed and forms the first flange 140, the first flange 140 can abut the outer side of the first conductive member 120, thereby limiting the relative position of the first conductive member 120 and the first wall 111 in the thickness direction z of the first wall.

[0121] In the above scheme, the third through hole 1200 is arranged on the first conductive member 120, so that one end of the first connecting member 14 is connected with the first wall 111, and the other end can pass through the first conductive member 120 to realize the riveting of the first conductive member 120 and the first wall 111, so that the riveting position is on the outside of the shell 11, thereby reducing the risk of liquid leakage inside the battery monomer 10, and improving the reliability of the battery 100.

[0122] According to some embodiments of the present application, referring to FIG. 8 and FIG. 10, the side of the first conductive member 120 away from the first wall 111 forms a first groove 1201, the third through hole 1200 penetrates the groove bottom of the first groove 1201, and at least part of the first flange 140 is located in the first groove 1201.

[0123] The side of the first conductive member 120 away from the first wall 111 can be the outer side of the first conductive member 120, and the first groove 1201 can be a groove structure formed on the outer side of the first conductive member 120. In some embodiments, the shape of the first groove 1201 includes but is not limited to a circular shape, a triangular shape, a square shape or other structures.

[0124] The "third through hole 1200 penetrates the groove 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 aperture of the third through hole 1200 is formed at the groove bottom of the first groove 1201, that is, the aperture of the third through hole 1200 is located between the outer side surface and the inner side surface of the first conductive member 120, and the part of the first connecting member 14 that penetrates the second through hole 1111 can be located in the first groove 1201 as a whole or can be partially located in the first groove 1201 and protrude from the first groove 1201.

[0125] In some embodiments, the side of the first flange 140 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.

[0126] For example, the first flange 140 is located in the first groove 1201 as a whole, and the first flange 140 and the groove bottom of the first groove 1201 abut each other. The abutment can be indirect abutment or direct abutment. For example, when the first connecting member 14 is made of metal, an insulating structure is arranged between the first flange 140 and the groove bottom of the first groove 1201, and the first flange 140 and the groove bottom of the first groove 1201 can exert a pressing force on the insulating structure therebetween. For another example, when the first connecting member 14 is made of non-metal insulating material, the first flange 140 and the groove bottom of the first groove 1201 can directly contact and abut.

[0127] In the above scheme, by arranging the first groove 1201 on the side of the first conductive member 120 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 monomer 10 compact in structure and high in volumetric energy density.

[0128] According to some embodiments of the present application, referring to FIG. 8, the battery monomer 10 further comprises a first insulating member 150, at least part of the first insulating member 150 is arranged 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.

[0129] The first insulating member 150 can be an insulating structure located at least partially 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 sleeve-shaped, part of the first insulating member 150 can be located in the first groove 1201, and another part can be located in the third through hole 1200.

[0130] For example, a portion of the first insulation member 150 can be located between the inner circumferential surface of the first groove 1201 and the outer circumferential surface of the first flange 140, a portion of the first insulation member 150 can be located between the first flange 140 and the groove bottom of the first groove 1201, and another portion of the first insulation member 150 can be located between the hole wall of the third through hole 1200 and the main body of the first connecting member 14.

[0131] The first insulation member 150 can be made of a material with a relatively high resistance value, such as an organic insulation material, an inorganic insulation material, or a mixed insulation material. For example, in some embodiments of the present application, the material of the first insulation member 150 can include insulation PPS (polyphenylene sulfide), polypropylene, or polyethylene.

[0132] In the above scheme, by arranging the first insulation member 150 between the first connecting member 14 and the first conductive member 120, the risk of the first connecting member 14 conducting the first conductive member 120 to the first wall 111 to cause internal short circuit of the battery monomer 10 can be reduced, thereby facilitating the improvement of the reliability of the battery 100.

[0133] According to some embodiments of the present application, referring to FIG. 8 and FIG. 11, FIG. 11 is a schematic view of the first insulation member 150 and the second insulation member 151 in some embodiments of the present application. The battery monomer 10 further includes a second insulation member 151, at least a portion of the second insulation member 151 is arranged between the first conductive member 120 and the first wall 111, and is used for insulating and isolating the first conductive member 120 and the first wall 111.

[0134] The second insulation member 151 is an insulation structure located at least partially between the first conductive member 120 and the first wall 111. The second insulation member 151 can be the first insulation structure described above.

[0135] The second insulation member 151 is used for insulating and isolating the first conductive member 120 and the first wall 111. In some embodiments, a portion of the second insulation member 151 can be between the inner side surface of the first conductive member 120 and the first wall 111, and another portion of the second insulation member 151 can cover at least a portion of the outer circumferential surface of the first conductive member 120.

[0136] Referring to FIG. 11, the second insulation member 151 can be formed with a first through hole 1511 and a second through hole 1512. The first through hole 1511 can correspond to the first through hole 1110, and the first pole 121 can pass through the first through hole 1511. The second through hole 1512 can correspond to the second through hole 1111, and the first deformation member 13 can pass through the second through hole 1512 to contact the first conductive member 120.

[0137] In the above scheme, by arranging the 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 of the battery monomer 10, and further facilitating the improvement of the reliability of the battery 100.

[0138] According to some embodiments of the present application, referring to FIG. 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.

[0139] The fourth through hole 1510 is a hole structure penetrating the second insulating member 151 along the thickness direction z of the first wall, and the fourth through hole 1510 is arranged corresponding to the first connecting member 14 and is for the first connecting member 14 to pass through.

[0140] In the above scheme, by arranging the fourth through hole 1510 for the first connecting member 14 to pass through, the risk of mutual interference between the first connecting member 14 and the second insulating member 151 can be reduced, which facilitates the assembly of the battery monomer 10 and the improvement of the manufacturing efficiency of the battery monomer 10, and further facilitates the improvement of the manufacturing efficiency of the battery 100.

[0141] According to some embodiments of the present application, the first insulating member 150 and the second insulating member 151 are in a split structure, or the first insulating member 150 and the second insulating member 151 are integrally formed.

[0142] In some embodiments, the first insulating member 150 and the second insulating member 151 are in a split structure independent of each other, for example, during assembly, the first insulating member 150 and the second insulating member 151 are assembled respectively. In some embodiments, the first insulating member 150 and the second insulating member 151 are integrally formed, and during assembly, the first insulating member 150 and the second insulating member 151 can be assembled simultaneously.

[0143] In the above scheme, by arranging the first insulating member 150 and the second insulating member 151 in a split structure, the cost of structure manufacturing and maintenance can be reduced, which facilitates the control of the cost of the battery monomer 10; by integrally forming the first insulating member 150 and the second insulating member 151, the assembly process can be simplified, the assembly efficiency of the battery monomer 10 can be improved, and the manufacturing efficiency of the battery monomer 10 can be improved.

[0144] According to some embodiments of the present application, the first connecting member 14 is integrally formed with the first wall 111, or the first connecting member 14 is welded to the first wall 111.

[0145] In some embodiments, the first connecting member 14 and the first wall 111 are integrally formed, for example, the first connecting member 14 can be formed on the outer side of the first wall 111 by extrusion or stamping process, or the first wall 111 with the first connecting member 14 can be made by casting or forging process.

[0146] In some embodiments, the first connecting member 14 is integrally formed with the first wall 111. In some embodiments, the first connecting member 14 is separately formed from the first wall 111, and the first connecting member 14 is connected to the first wall 111 by welding.

[0147] In the above-mentioned solution, by integrally forming the first connecting member 14 with the first wall 111, the first connecting member 14 and the first wall 111 have high connection stability, so that the first wall 111 and the first conductive member 120 have high structural stability through the first connecting member 14. By welding the first connecting member 14 to the first wall 111, the manufacturing difficulty of the first connecting member 14 is reduced, the manufacturing efficiency of the battery monomer 10 is improved, and the manufacturing efficiency of the battery monomer 10 is improved.

[0148] According to some embodiments of the present application, please refer to FIG. 12 and FIG. 13, FIG. 12 is a schematic diagram of the second electrode terminal 16, the first wall 111 and the second deforming member 17 in some embodiments of the present application, and FIG. 13 is a schematic diagram of the internal structure of the second conductive member 160, the first wall 111 and the second connecting member 18 in some embodiments of the present application.

[0149] The battery monomer 10 further comprises a second conductive member 160, a second pole 161, a second deforming member 17 and a second connecting member 18. The second conductive member 160 is disposed outside the first wall 111 and insulated from the first wall 111. The second pole 161 is connected to the second conductive member 160. The second deforming member 17 is electrically connected to the first wall 111, and 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.

[0150] In some embodiments, the battery monomer 10 further comprises a second electrode terminal 16 electrically connected to the second tab 22 of the electrode assembly 20 for connecting to an external busbar. 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 electrically connect to the electrode assembly 20 to make current flow into or out of the second tab 22 through the second electrode terminal 16. In some embodiments, the second electrode terminal 16 is made of a metal material, for example, made of aluminum, copper, iron, steel, alloy or composite metal. In some embodiments, the second electrode terminal 16 can be connected to the second tab 22 through a second adapter 220. For example, the second tab 22 of the electrode assembly 20 is composed of a plurality of second sub-tabs stacked together, one end of the second adapter 220 is welded to the second tab 22, and the other end of the second adapter 220 is welded to the second electrode terminal 16.

[0151] 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 facing away from the electrode assembly 20, and is used to connect with an external busbar component (e.g., a tab). Exemplarily, the second conductive member 160 is welded with the busbar component. The second pole 161 is connected with the second tab 22 of the electrode assembly 20, and is exemplarily connected with the second tab 22 through the second adapter 220. The second conductive member 160 and the second pole 161 are connected with each other, and the connection relationship between the second conductive member 160 and the second pole 161 includes welding, riveting, threaded connection, or one-piece forming, etc. Exemplarily, in some embodiments, the second conductive member 160 and the second pole 161 are riveted with each other. The second conductive member 160 is generally plate-shaped, and is formed with a riveting hole. The second pole 161 is generally columnar, such as cylindrical or polygonal columnar, etc. Part of the second pole 161 passes through the fifth through hole 1112 of the first wall 111 and is riveted in the riveting hole, and the other part is located in the shell 11 and is connected with the second tab 22 through the second adapter 220.

[0152] In some embodiments, a third insulating structure 153 is arranged between the second conductive member 160 and the first wall 111, and is used to insulate and separate the second conductive member 160 and the first wall 111. A fourth insulating structure 154 is arranged between the second pole 161 and the first wall 111, such as between the second pole 161 and the fifth through hole 1112 of the first wall 111.

[0153] In some embodiments, the third insulating structure 153 and / or the fourth insulating structure 154 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material, etc. Exemplarily, in some embodiments of the present application, the material of the third insulating structure 153 and / or the fourth insulating structure 154 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the third insulating structure 153 and / or the fourth insulating structure 154 can also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0154] In some embodiments, the resistance value of the third insulating structure 153 and / or the fourth insulating structure 154 can be in units of megaohms (MΩ). Exemplarily, in some embodiments of the battery cell 10 provided by the present application, the resistance value of the first insulating structure and / or the second insulating structure 152 can be greater than or equal to 200 MΩ.

[0155] The second deformation member 17 is mounted on the first wall 111 and is electrically connected to the first wall 111. In some embodiments, the second deformation member 17 can be made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second deformation member 17 can be welded to the inner side of the first wall 111.

[0156] The second deformation member 17 is a structure member that deforms under the internal pressure of the battery cell 10. The second deformation member 17 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure increases. When the internal pressure reaches a certain level, such as a second threshold, the second deformation member 17 deforms to contact the second conductive member 160, thereby connecting the first wall 111 and the second electrode terminal 16, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0157] In some embodiments, the second deformation member 17 can be a flip sheet that flips under pressure. For example, the first wall 111 has a sixth through hole 1113, and the edge portion of the second deformation member 17 is welded to the first wall 111, so that the second deformation member 17 closes the sixth through hole 1113. When the internal pressure of the battery cell 10 reaches the second threshold, the second deformation member 17 deforms and flips in the direction facing the first wall 111, thereby contacting the second conductive member 160 through the sixth through hole 1113.

[0158] In some embodiments, the first threshold and the second threshold can be equal or not equal.

[0159] In some embodiments, when the battery cell 10 is in an abuse condition due to overcharge or the like, the internal pressure of the battery cell 10 increases. 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, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to cause an internal short circuit. The large current generated instantaneously can melt the electrical connection member inside the battery cell 10, thereby cutting off the charging and discharging circuit of the battery cell 10, thereby playing a role in overcharge protection. The melted electrical connection member can include the first adapter 210 and / or the second adapter 220. For example, the first adapter 210 has a first melting portion that can melt when a larger current passes through, thereby breaking the current path of the first tab 21 and the first electrode terminal 12.

[0160] 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 constrain the second conductive member 160, thereby improving the connection stability between the second conductive member 160 and the first wall 111. In some embodiments, the second conductive member 160 is deformed under the impact of an internal pressure increase of the battery cell 10. The second connecting member 18 can improve the impact resistance of the second conductive member 160, thereby reducing the deformation of the second conductive member 160. In some embodiments, at least part of the second connecting member 18 can be located between the second conductive member 160 and the first wall 111 along the thickness direction z of the first wall 111, so that the second conductive member 160 and the first wall 111 are connected to each other. In other embodiments, 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 of the first wall 111. For example, the second connecting member 18 is in the form of a restraint band, which spans the outer side of the first wall 111 and the outer side of the second conductive member 160.

[0161] In some embodiments, the second connecting member 18 is made of a non-metallic or metallic material. For example, the second connecting member 18 is made of a metallic material, including but not limited to aluminum, copper, iron, steel, alloy, or composite metal. When the second connecting member 18 is made of a metallic material, an insulating structure can be provided between the second conductive member 160 and the second connecting member 18 to insulate and separate the second conductive member 160 and the second connecting member 18, thereby reducing the risk of electrical connection between the second conductive member 160 and the first wall 111 through the second connecting member 18. Alternatively, the second connecting member 18 is made of a non-metallic material, for example, a plastic material.

[0162] For example, the second connecting member 18 is a rivet structure formed on the outer side of the first wall 111 by punching or extrusion molding, located on the side of the sixth through hole 1113 away from the fifth through hole 1112. The number of the second connecting member 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 with the second conductive member 160 through the second connecting member 18.

[0163] Similar to the first connecting member 14 described above, the outer side surface of the second conductive member 160 can be formed with a second groove, the seventh through hole 1600 penetrates the groove bottom of the second groove, and at least 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 or below the outer side surface of the second conductive member 160. In some embodiments, the second connecting member 18 is a metal material, and the battery cell 10 further comprises a third insulating member 155, at least part of the third insulating member 155 is arranged 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. Part of the third insulating member 155 can be located between the inner circumferential surface of the second groove and the outer circumferential surface of the second flange 180, part of the third insulating member 155 can be located between the second flange 180 and the groove bottom of the second groove, and another part of the third insulating member 155 can be located between the hole wall of the seventh through hole 1600 and the main body of the second connecting member 18.

[0164] The third insulating member 155 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material, etc. Exemplarily, in some embodiments of the present application, the material of the third insulating member 155 can include insulating PPS (polyphenylene sulfide), polypropylene, or polyethylene.

[0165] In the above scheme, on the one hand, by arranging the second deformation member 17, when the internal pressure of the battery cell 10 reaches a certain degree, the second deformation member 17 deforms to contact the second conductive member 160, so that the second pole 161 is electrically connected with the first wall 111, and cooperates with the contact of the first deformation member 13 and the first conductive member 120 to make the electrical connection member inside the battery cell 10 melt due to 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 of overcharge protection and reducing the risk of thermal runaway of the battery cell 10, and further improving the reliability of the battery 100; on the other hand, by arranging 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 deformation member 17 can be reduced, so that the second deformation member 17 effectively contacts the second conductive member 160 to realize overcharge protection when the battery cell 10 is in an abuse working condition such as overcharge, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery 100.

[0166] According to some embodiments of this application, the first pole post 121 and the second pole post 161 are spaced apart along a first direction x. Along the first direction x, the first deformable member 13 is located on the side of the first pole post 121 opposite to the second pole post 161, and / or, the second deformable member 17 is located on the side of the second pole post 161 opposite to the first pole post 121.

[0167] The first direction x can 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. For example, the first wall 111 is an end cap, the end cap is square, and the first direction x can be the length direction of the end cap.

[0168] "Along the first direction x, the first deformable member 13 is located on the side of the first pole post 121 away from the second pole post 161" can be understood as the first deformable member 13 being located away from the middle of the first wall 111 relative to the first pole post 121, that is, the first deformable member 13 is on the outside and the first pole post 121 is on the inside.

[0169] "The second deformable part 17 is located on the side of the second pole post 161 away from the first pole post 121" can be understood as follows: along the first direction x, the second deformable part 17 is away from the middle of the first wall 111 relative to the second pole post 161, that is, the second deformable part 17 is on the outside and the second pole post 161 is on the inside.

[0170] In some embodiments, the positional relationship of the first deformable member 13, the first pole post 121, the second deformable member 17, and the second pole post 161 in the first direction x may include the following cases: Case 1, the first deformable member 13, the first pole post 121, the second pole post 161, and the second deformable member 17; Case 2, the first deformable member 13, the first pole post 121, the second deformable member 17, and the second pole post 161; Case 3, the first pole post 121, the first deformable member 13, the second pole post 161, and the second deformable member 17.

[0171] Compared to the configuration where the electrode post is located on the outside of the corresponding deformable part, in the above scheme, by placing the first deformable part 13 on the side of the first electrode post 121 away from the second electrode post 161, and / or placing the second deformable part 17 on the side of the second electrode post 161 away from the first electrode post 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 charging and discharging performance of the battery 100 can be improved.

[0172] According to some embodiments of this application, a battery 100 is also provided, which has a battery cell 10 as described above. Referring to FIG3, the battery 100 includes a battery cell 10 and a housing, wherein the battery cell 10 is housed in the housing. The housing provides housing space for the battery cell 10, and the housing can adopt various structures.

[0173] In the battery 100, the battery cell 10 can be one or multiple, and each battery cell 10 can be fixed to the case by a connecting member (e.g., a bolt), or each battery cell 10 can be fixed to the case by an adhesive.

[0174] According to some embodiments of the present application, there is also provided an energy storage device, which comprises the battery cell 10 described above.

[0175] In some embodiments, the battery cell 10 can first form the battery 100, and one or more batteries 100 can be applied to the energy storage device. Referring to FIG. 2, the energy storage device 2000 can comprise a cabinet 2001 and multiple batteries 100. The multiple batteries 100 can be arranged in the cabinet. The multiple batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0176] According to some embodiments of the present application, there is also provided an energy consumption device, which comprises the battery cell 10 described above. In some embodiments, the battery cell 10 can first form the battery 100, and one or more batteries 100 can be applied to the energy consumption device.

[0177] In some embodiments, referring to FIG. 1, the energy consumption device is a vehicle 1000. The vehicle 1000 can comprise a controller 200, a motor 300, and a battery 100, and the controller 200 can be used to control the battery 100 to supply power to the motor 300.

[0178] According to some embodiments of the present application, there is provided a battery cell 10, referring to FIGS. 4-13.

[0179] The battery cell 10 comprises a housing 11, an electrode assembly 20, a first electrode terminal 12, a first deformation member 13, a second electrode terminal 16, and a second deformation member 17.

[0180] The housing 11 is square-shaped, and the housing 11 comprises a shell 110 and a first wall 111. The shell 110 has an accommodating cavity formed inside, which is used to accommodate the electrode assembly 20, and the shell 110 has an opening communicating with the accommodating cavity, and the first wall 111 covers the opening of the shell 110 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 20 and an electrolyte. The inner side of the first wall 111 is provided with a fifth insulation structure 156 for insulating and isolating the first wall 111 from the electrode assembly 20.

[0181] The first electrode terminal 12, the first deformation piece 13, the second electrode terminal 16, and the second deformation piece 17 are mounted to the first wall 111. The first electrode terminal 12 and the first wall 111 are insulated from each other by an insulating structure, the second electrode terminal 16 and the first wall 111 are insulated from each other by an insulating structure, and the first deformation piece 13 and the second deformation piece 17 are respectively welded to the inner side of the first wall 111 and are electrically connected to the first wall 111.

[0182] In some embodiments, the first electrode terminal 12 includes a first conductive piece 120 and a first pole 121 riveted to each other. The first conductive piece 120 is located on the side of the first wall 111 away from the electrode assembly 20, and is used to connect to an external busbar component (such as a tab). Part of the first pole 121 is located in the shell 11 and is connected to the first tab 21 of the electrode assembly 20 through a first adapter 210.

[0183] A second insulating piece 151 is arranged between the first conductive piece 120 and the first wall 111, and a second insulating structure 152 is arranged between the first pole 121 and the first wall 111. In some embodiments, the first conductive piece 120 is square, and the length direction of the first conductive piece 120 is the first direction x. Along the first direction x, one end of the first conductive piece 120 is connected to the first pole 121, and the other end of the first conductive piece 120 is connected to the first wall 111 through a first connecting piece 14.

[0184] The first connecting piece 14 is a riveting structure formed on the outer side of the first wall 111 by stamping or extrusion. The first conductive piece 120 is formed with a third through hole 1200 corresponding to the first connecting piece 14, and the first connecting piece 14 passes through the third through hole 1200 and is riveted to the first conductive piece 120. In some embodiments, a first insulating piece 150 is arranged between the first connecting piece 14 and the first conductive piece 120.

[0185] In some embodiments, the second electrode terminal 16 includes a second conductive piece 160 and a second pole 161 riveted to each other. The second conductive piece 160 is located on the side of the first wall 111 away from the electrode assembly 20, and is used to connect to an external busbar component (such as a tab). Part of the second pole 161 is located in the shell 11 and is connected to the second tab 22 of the electrode assembly 20 through a second adapter 220.

[0186] The third insulation structure 153 is arranged between the second conductive member 160 and the first wall 111, and the fourth insulation structure 154 is arranged 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 with the second pole 161, and the other end of the second conductive member 160 is connected with the first wall 111 through the second connecting member 18.

[0187] The second connecting member 18 is a riveting structure member formed on the outer side surface of the first wall 111 by stamping or extrusion, and the second conductive member 160 is formed with a seventh through hole 1600 corresponding to the second connecting member 18, and the second connecting member 18 passes through the seventh through hole 1600 and is riveted with the second conductive member 160. In some embodiments, an insulation structure is arranged between the second connecting member 18 and the second conductive member 160.

[0188] The first deformation member 13 and the second deformation member 17 can be structure members that are deformed under pressure. In some embodiments, the first deformation member 13 and the second deformation member 17 can be flip tabs, respectively, which are flipped under pressure.

[0189] In some embodiments, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure of the battery cell 10 increases, when the internal pressure of the battery cell 10 reaches a first threshold value, the first deformation member 13 deforms, the first deformation member 13 contacts the first conductive member 120, and the first electrode terminal 12 and the shell 11 are short-circuited, when the internal pressure of the battery cell 10 reaches a second threshold value, the second deformation member 17 deforms, the second deformation member 17 contacts the second conductive member 160, and the second electrode terminal 16 and the shell 11 are short-circuited, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to form an internal short circuit, and a large current generated instantaneously can melt the electrical connection member inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 210 and / or the second adapter 220. For example, the first adapter 210 has a first melting portion, which can melt when a larger current passes through, thereby breaking the current path of the first tab 21 and the first electrode terminal 12.

[0190] In the above scheme, by arranging the first connecting member 14 to connect the first conductive member 120 and the first wall 111, and arranging 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, the risk that the conductive member is deformed too much to contact the deformation member due to the internal pressure of the battery monomer 10 is reduced, the deformation member effectively contacts the conductive member to achieve overcharge protection when the battery monomer 10 is in an abuse working condition such as overcharge, and thus the reliability of the battery monomer 10 is improved, and the reliability of the battery 100 is further improved.

[0191] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, The battery cell comprises: a housing having a first wall; a first conductive member disposed outside the first wall and insulated from the first wall; a first pole post connected to the first conductive member; a first deformation member electrically connected to the first wall, the first deformation member being configured to be deformed to be in contact with the first conductive member to electrically connect the first pole post to the first wall; a first connecting member connecting the first conductive member and the first wall.

2. The battery cell according to claim 1, wherein the first wall has a first through hole and a second through hole arranged along a first direction, the first pole post is disposed in the first through hole, and the first deformation member closes the second through hole; the first connecting member is located on a side of the second through hole away from the first through hole along the first direction.

3. The battery cell according to claim 2, wherein the number of the first connecting members is plural, and the plural first connecting members are arranged at intervals along a second direction perpendicular to the first direction.

4. The battery cell according to any one of claims 1-3, wherein the first wall and the first conductive member are riveted by the first connecting member.

5. The battery cell according to claim 4, wherein the first conductive member has a third through hole, the first connecting member is disposed in 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 the first flange abuts against the first conductive member along the thickness direction of the first wall.

6. The battery cell according to claim 5, wherein a first groove is formed on a side of the first conductive member away from the first wall, the third through hole penetrates through the groove bottom of the first groove, and at least part of the first flange is located in the first groove.

7. The battery cell according to any one of claims 1-6, wherein the battery cell further comprises a first insulating member, at least part of the first insulating member is disposed between the first connecting member and the first conductive member, and the first connecting member and the first conductive member are insulated and separated by the first insulating member.

8. The battery cell according to claim 7, wherein the battery cell further comprises a second insulating member, at least part of the second insulating member is disposed between the first conductive member and the first wall, and the first conductive member and the first wall are insulated and separated by the second insulating member.

9. The battery cell of claim 8, wherein, the second insulating member is provided with a fourth through hole, and the first connecting member is disposed in the fourth through hole.

10. The battery cell according to claim 8 or 9, wherein the first insulating member and the second insulating member are in a split structure, or the first insulating member and the second insulating member are integrally formed.

11. The battery cell according to any one of claims 1-10, wherein 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 1-11, wherein the battery cell further comprises: a second conductive member disposed outside the first wall and insulated from the first wall; a second pole post connected to the second conductive member; a second deformable member electrically connected to the first wall, the second deformable member configured to be deformable to contact the second conductive member to electrically connect the second pole to the first wall; a second connecting member connecting the second conductive member and the first wall.

13. The battery cell of claim 12, wherein, the first pole and the second pole are spaced apart along a first direction, along the first direction, the first deformable member is located on a side of the first pole facing away from the second pole, and / or the second deformable member is located on a side of the second pole facing away from the first pole.

14. A battery, wherein, a battery cell comprising any one of claims 1-13.

15. An energy storage device, wherein, a battery cell comprising any one of claims 1-13.

16. An electrical device, comprising: a battery cell comprising any one of claims 1-13, the battery cell being used to provide electrical energy.

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