Battery cell, battery, energy storage device, and electric device

Abstract

A battery cell, a battery, an energy storage device, and an electric device. The battery cell comprises a casing, an electrode assembly, a first electrode terminal, and a first insulating part. The casing has a first wall. The electrode assembly is arranged in the casing. The first electrode terminal is arranged on the first wall and is electrically connected to the electrode assembly, and the first electrode terminal is used for inputting and outputting electric energy. The first insulating part is arranged between the first wall and the first electrode terminal and is used for insulating and isolating the first electrode terminal from the first wall. The battery cell can effectively improve the reliability of the battery.

Description

Battery cell, battery, energy storage device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202410417335.7, filed on April 8, 2024, entitled “Battery cell, battery, energy storage device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular, relates 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 scheme provided by the present application can effectively improve the reliability of the battery.

[0006] In a first aspect, the present application provides a battery cell. The battery cell comprises a housing, an electrode assembly, a first electrode terminal and a first insulation part. The housing has a first wall. The electrode assembly is arranged in the housing. The first electrode terminal is arranged on the first wall and electrically connected with the electrode assembly, and the first electrode terminal is used for input and output of electric energy. The first insulation part is arranged between the first wall and the first electrode terminal, and is used for insulating and isolating the first electrode terminal and the first wall.

[0007] In the above scheme, by arranging the first insulation part between the first wall and the first electrode terminal, the first wall and the first electrode terminal can be effectively insulated and isolated, the risk of internal short circuit of the battery cell caused by short circuit between the first wall and the first electrode terminal is reduced, and the reliability of the battery is high. In particular, in the energy storage device with high working voltage, by arranging the first insulation part between the first wall and the first electrode terminal, the risk of thermal runaway of the energy storage device caused by high voltage conduction of the first wall and the electrode terminal due to the out-of-control of the remaining battery cells in the battery, which leads to internal short circuit of the battery cell, can be effectively reduced.

[0008] According to some embodiments of the present application, the battery cell further includes a first deformation member electrically connected with the first wall, the first deformation member being configured to be deformable to contact the first electrode terminal to electrically connect the first electrode terminal with the first wall.

[0009] In the above scheme, by arranging the first deformation member, when the internal pressure of the battery cell reaches a certain degree, for example, the first threshold, the first deformation member is deformed to contact the first electrode terminal, so that the first electrode terminal is electrically connected with the first wall, the internal short circuit of the battery cell is realized, the electric connection member in the battery cell is melted due to the large current generated by the short circuit, and the charging and discharging circuit of the battery cell is cut off, thereby playing a role of overcharge protection and reducing the risk of thermal runaway of the battery cell, and further improving the reliability of the battery.

[0010] According to some embodiments of the present application, the first wall is formed with a first through hole and a second through hole, and the first electrode terminal passes through the first through hole. The first deformation member closes the second through hole, and the first deformation member is configured to be deformable to contact the first electrode terminal through the second through hole.

[0011] In the above scheme, when the internal pressure of the battery cell reaches a certain degree, for example, the first threshold, the internal pressure of the battery cell can act on the first deformation member, so that the first deformation member is deformed towards the outside of the first wall to effectively contact the first part of the first electrode terminal, thereby effectively realizing the internal short circuit of the battery cell, melting the electric connection member in the battery cell due to the large current generated by the short circuit, cutting off the charging and discharging circuit of the battery cell, thereby reducing the risk of thermal runaway of the battery cell, and further improving the reliability of the battery.

[0012] According to some embodiments of the present application, in the thickness direction of the first wall, the projection of the first part of the first wall on the outside of the first wall and the projection of the first deformation member at least partially overlap.

[0013] In the above scheme, by arranging the first deformation member corresponding to the first part in the thickness direction of the first wall, when the internal pressure of the battery cell reaches a certain degree, for example, the first threshold, the first part can be quickly contacted with a small deformation amount, so that the first electrode terminal and the first wall are electrically connected, thereby effectively realizing the internal short circuit of the battery cell, melting the electric connection member in the battery cell due to the large current generated by the short circuit, cutting off the charging and discharging circuit of the battery cell, thereby reducing the risk of thermal runaway of the battery cell, and further improving the reliability of the battery.

[0014] According to some embodiments of the present application, the first wall includes a body portion and a first reinforcing portion connected with each other, and the first part is arranged in the first reinforcing portion.

[0015] In the above scheme, by arranging the first reinforcing part, the overall strength of the first wall can be improved, the risk that the first wall is deformed under the action of internal pressure of the battery monomer or external impact, so that the first deformation member cannot effectively contact the first part to conduct the first electrode terminal and the first wall, the first deformation member can effectively contact the first electrode terminal under the abuse condition such as overcharge of the battery monomer, thereby effectively playing the role of overcharge protection, reducing the risk of thermal runaway of the battery monomer, and making the battery have higher reliability.

[0016] According to some embodiments of the present application, the length of the first wall is greater than or equal to 150 mm, and the width of the first wall is greater than or equal to 45 mm.

[0017] According to some embodiments of the present application, the first reinforcing part includes a first protruding part protruding from one surface of the body part in the thickness direction of the first wall.

[0018] In the above scheme, by arranging the first protruding part to strengthen the structural strength of the first wall, the risk that the first wall is deformed under the action of internal pressure of the battery monomer or external impact, so that the first deformation member cannot effectively contact the first part to conduct the first electrode terminal and the first wall, can be effectively reduced, and the battery has higher reliability.

[0019] According to some embodiments of the present application, the first reinforcing part further includes a first recess part arranged on the other surface of the body part in the thickness direction of the first wall, and the first recess part is arranged opposite to the first protruding part.

[0020] In the above scheme, the first recess part is arranged at the position corresponding to the first protruding part, on the one hand, the forming difficulty of the first protruding part can be reduced and the material cost can be saved, on the other hand, if the first recess part is inside the first wall, more active substances or electrolyte can be accommodated in the space of the first recess part, which is beneficial to the improvement of the energy density or charge-discharge performance of the battery monomer, and if the first recess part is outside the first wall, external structural parts can be accommodated in the space of the first recess part, which is beneficial to the improvement of the volume energy density of the battery.

[0021] According to some embodiments of the present application, the first protruding part is located outside the first wall, and the first protruding part is formed with a first positioning groove accommodating the first part to limit the movement of the first part.

[0022] In the above scheme, by arranging the first positioning groove, the first electrode terminal can be effectively positioned and the displacement of the first electrode terminal can be limited, on the one hand, the risk that the first electrode terminal is separated from the internal electrical connection component of the battery monomer to cause internal disconnection of the battery monomer can be reduced, and on the other hand, the first electrode terminal can be effectively matched with the first deformation member to play the role of overcharge protection, thereby improving the reliability of the battery.

[0023] According to some embodiments of the present application, the first protrusion is located on the outer side of the first wall, and the size of the protrusion of the first protrusion from the body portion in the thickness direction of the first wall is greater than or equal to 0.1 mm and less than or equal to 5 mm.

[0024] In the above scheme, by setting the size of the protrusion of the first protrusion from the body portion to be greater than or equal to 0.1 mm, the structural strength of the first wall can be effectively improved, so that the first deformation member effectively contacts the first electrode terminal when the internal pressure of the battery cell reaches a certain degree, for example, the first threshold, thereby playing a role in overcharge protection, and further improving the reliability of the battery; by setting the size of the protrusion of the first protrusion from the body portion to be less than or equal to 5 mm, the occupation of space by the first protrusion can be reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the size of the protrusion of the first protrusion from the body portion to be greater than or equal to 0.1 mm and less than or equal to 5 mm, the reliability of the overcharge protection of the battery cell and the volume energy density of the battery can be considered.

[0025] According to some embodiments of the present application, the size of the protrusion of the first protrusion from the body portion in the thickness direction of the first wall is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0026] In the above scheme, by setting the size of the protrusion of the first protrusion from the body portion to be greater than or equal to 0.5 mm, the structural strength of the first wall is further improved, so that the first deformation member efficiently contacts the first electrode terminal when the internal pressure of the battery cell reaches a certain degree, for example, the first threshold, thereby playing a role in overcharge protection, and further improving the reliability of the battery; by setting the size of the protrusion of the first protrusion from the body portion to be less than or equal to 3 mm, the occupation of space by the first protrusion can be effectively reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the size of the protrusion of the first protrusion from the body portion to be greater than or equal to 0.5 mm and less than or equal to 3 mm, the reliability of the overcharge protection of the battery cell and the volume energy density of the battery can be considered.

[0027] According to some embodiments of the present application, the first insulating portion includes a first insulating member, at least a portion of the first insulating member is arranged between the first portion of the first electrode terminal located on the outer side of the first wall and the first wall, the first insulating member is formed with a third through hole and a fourth through hole, and the third through hole is arranged opposite to the first through hole in the thickness direction of the first wall, and the fourth through hole is arranged opposite to the second through hole.

[0028] In the above scheme, the first insulating piece is simple in structure. On the one hand, the first electrode terminal passes through the third through hole, so that the first electrode terminal is electrically connected with the electrode assembly and realizes external charging and discharging, and the first deformation piece deforms through the fourth through hole to be able to contact the first part, realizing overcharge protection. On the other hand, the first insulating piece can effectively insulate and isolate the first part and the first wall, reduce the risk of internal short circuit of the battery cell caused by short circuit between the first part and the first wall, and make the battery have high reliability.

[0029] According to some embodiments of the present application, the first insulating piece comprises a first body and a first flange, the first body is located between the first part and the first wall, and the first flange is arranged on the surface of the first body away from the first wall, and the first flange surrounds at least part of the outer circumferential surface of the first part.

[0030] In the above scheme, by arranging the first body and the first flange, the first wall and the first part can be effectively insulated and isolated, so that the first part and the first wall have a far creepage distance, the first insulating piece has high insulation performance, the risk of internal short circuit of the battery cell caused by short circuit between the first wall and the first electrode terminal is effectively reduced, and the battery has high reliability.

[0031] According to some embodiments of the present application, the first insulating piece further comprises a second flange, the second flange is arranged around the third through hole and located between the hole wall of the first through hole and the first electrode terminal.

[0032] In the above scheme, by arranging the second flange, the hole wall of the first through hole and the first electrode terminal can be effectively insulated and isolated, the risk of internal short circuit of the battery cell caused by contact between the first electrode terminal and the hole wall of the first through hole is reduced, and the reliability of the battery is effectively improved.

[0033] According to some embodiments of the present application, the battery cell further comprises a second electrode terminal, a second insulating part and a second deformation piece. The second electrode terminal is arranged on the first wall and electrically connected with the electrode assembly, the second electrode terminal is used for input and output of electric energy, and the polarity of the second electrode terminal and the first electrode terminal is opposite. The second insulating part is arranged between the first wall and the second electrode terminal, and is used for insulating and isolating the second electrode terminal and the first wall. The second deformation piece is electrically connected with the first wall, and the second deformation piece is configured to be deformed to contact the second electrode terminal, so as to electrically connect the second electrode terminal with the first wall.

[0034] In the above scheme, on the one hand, by arranging the second insulation part between the first wall and the second electrode terminal, the first wall and the second electrode terminal can be effectively insulated and isolated, and the risk of internal short circuit of the battery cell caused by short circuit between the first wall and the second electrode terminal is reduced, so that the reliability of the battery is high; on the other hand, by arranging the second deformation part, when the internal pressure of the battery cell reaches a certain degree, for example, the second threshold value, the second deformation part is deformed to contact the second electrode terminal, so that the second electrode terminal is electrically connected with the second wall, and the short circuit of the first deformation part and the first electrode terminal is matched, so that the electric connection member in the battery cell is fused due to the large current generated by the short circuit, so as to cut off the charging and discharging circuit of the battery cell, thereby playing the role of overcharge protection, and reducing the risk of thermal runaway of the battery cell, thereby making the battery have high reliability; on the other hand, since the first electrode terminal and the second electrode terminal are insulated and isolated from the first wall under normal working conditions, the shell of the battery cell can be uncharged, which is beneficial to the energy storage device formed by the battery cell, so that the risk of sparking breakdown between two adjacent battery cells in the energy storage device is small, and the second deformation part is arranged to effectively realize the role of overcharge protection, so that the energy storage device has high reliability.

[0035] According to some embodiments of the present application, the second electrode terminal is a negative electrode terminal, so that the minimum pressure value for deforming the second deformation part is greater than the minimum pressure value for deforming the first deformation part.

[0036] In the above scheme, when the second electrode terminal is a negative electrode terminal, by making the minimum pressure value for deforming the second deformation part greater than the minimum pressure value for deforming the first deformation part, the second deformation part can be deformed when the internal pressure of the battery cell is greater than the first deformation part, on the one hand, the battery cell can have overcharge protection function, on the other hand, the risk of corrosion of the shell caused by the negative charge of the shell caused by the second deformation part caused by the gas generated in the battery cell under non-overcharge abuse working condition can be reduced, so as to ensure the integrity of the shell to a certain extent, reduce the risk of electrolyte leakage, and thus provide the reliability of the battery.

[0037] According to some embodiments of the present application, the first wall is formed with a fifth through hole and a sixth through hole, and the second electrode terminal passes through the fifth through hole. The second deformation part seals the sixth through hole, and the second deformation part is configured to be deformed to partially pass through the sixth through hole and contact the second electrode terminal.

[0038] In the above scheme, when the internal pressure of the battery cell reaches a certain degree, for example, the second threshold, the internal pressure of the battery cell can act on the second deformation member, so that the second deformation member deforms towards the outside of the first wall to effectively contact the third part of the second electrode terminal, cooperates with the first deformation member to contact the first electrode terminal, so that the electrical connection member in the battery cell is fused due to the large current generated by the short circuit, to cut off the charge-discharge circuit of the battery cell, thereby reducing the risk of thermal runaway of the battery cell, and thus the battery has higher reliability.

[0039] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the third part of the second electrode terminal located on the outside of the first wall at least partially overlaps the projection of the second deformation member.

[0040] In the above scheme, by arranging the second deformation member along the thickness direction of the first wall corresponding to the third part, when the internal pressure of the battery cell reaches a certain degree, for example, the second threshold, the third part can be quickly contacted with a small deformation amount, so as to quickly electrically connect the second electrode terminal and the first wall, cooperate with the first deformation member to contact the first electrode terminal, so that the electrical connection member in the battery cell is fused due to the large current generated by the short circuit, to cut off the charge-discharge circuit of the battery cell, thereby reducing the risk of thermal runaway of the battery cell, and thus the battery has higher reliability.

[0041] According to some embodiments of the present application, the first wall comprises a body part and a second reinforcing part connected to each other, and the third part of the second electrode terminal located on the outside of the first wall is arranged on the second reinforcing part.

[0042] In the above scheme, by arranging the second reinforcing part, the overall strength of the first wall can be improved, the risk that the first wall deforms due to the internal pressure of the battery cell or external impact, causing the second deformation member to fail to effectively contact the third part to conduct the second electrode terminal and the first wall, can be reduced, the second deformation member can effectively contact the second electrode terminal under the abuse condition of overcharging of the battery cell, thereby effectively playing the role of overcharge protection, reducing the risk of thermal runaway of the battery cell, and thus the battery has higher reliability.

[0043] According to some embodiments of the present application, the second reinforcing part comprises a second protruding part protruding from one surface of the body part along the thickness direction of the first wall.

[0044] In the above scheme, by arranging the second protruding part to strengthen the structural strength of the first wall, the risk that the first wall deforms due to the internal pressure of the battery cell or external impact, causing the second deformation member to fail to effectively contact the third part to conduct the second electrode terminal and the first wall, can be effectively reduced, and thus the battery has higher reliability.

[0045] According to some embodiments of the present application, the second reinforcing portion further comprises a second recess, which is arranged on the other surface of the body portion along the thickness direction of the first wall and is arranged opposite to the second protrusion.

[0046] In the above scheme, the second recess is arranged at the position corresponding to the second protrusion. On the one hand, the forming difficulty of the second protrusion can be reduced and the material cost can be saved. On the other hand, if the second recess is inside the first wall, more active substances or electrolyte can be accommodated in the space of the second recess, which is beneficial to the improvement of the energy density or the charge-discharge performance of the battery cell. If the second recess is outside the first wall, the external structural member can be accommodated in the space of the second recess, which is beneficial to the improvement of the volume energy density of the battery.

[0047] According to some embodiments of the present application, the second protrusion is located outside the first wall, and the second protrusion is formed with a second positioning groove, which accommodates the third portion to limit the movement of the third portion.

[0048] In the above scheme, by arranging the second positioning groove, the second electrode terminal can be effectively positioned and the displacement of the second electrode terminal can be limited. On the one hand, the risk that the second electrode terminal is separated from the internal electrical connection member of the battery cell to cause internal open circuit of the battery cell can be reduced. On the other hand, the second electrode terminal can be effectively matched with the second deformation member to play a role of overcharge protection, thereby improving the reliability of the battery.

[0049] According to some embodiments of the present application, the second protrusion is located outside the first wall, and the protruding size of the second protrusion from the body portion along the thickness direction of the first wall is greater than or equal to 0.1 mm and less than or equal to 5 mm.

[0050] In the above scheme, by setting the protruding size of the second protrusion from the body portion to be greater than or equal to 0.1 mm, the structural strength of the first wall can be effectively improved. When the internal pressure of the battery cell reaches a certain degree, for example, the second threshold, the second deformation member can effectively contact the second electrode terminal to play a role of overcharge protection, thereby improving the reliability of the battery. By setting the protruding size of the second protrusion from the body portion to be less than or equal to 5 mm, the space occupied by the second protrusion can be reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the protruding size of the second protrusion from the body portion to be greater than or equal to 0.1 mm and less than or equal to 5 mm, the reliability of the overcharge protection of the battery cell and the volume energy density of the battery can be considered.

[0051] According to some embodiments of the present application, the protruding size of the second protrusion from the body portion along the thickness direction of the first wall is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0052] In the above scheme, by setting the size of the second protrusion protruding from the body portion to be greater than or equal to 0.5 mm, the structural strength of the first wall is further improved, so that the second deformation member efficiently contacts the second electrode terminal when the internal pressure of the battery cell reaches a certain degree, for example, the second threshold, thereby playing a role in overcharge protection, and further improving the reliability of the battery; by setting the size of the second protrusion protruding from the body portion to be less than or equal to 3 mm, the second protrusion can effectively reduce the occupation of space and reduce the impact on the volume energy density of the battery. Therefore, by setting the size of the second protrusion protruding from the body portion to be greater than or equal to 0.5 mm and less than or equal to 3 mm, the reliability of the overcharge protection of the battery cell and the volume energy density of the battery can be considered.

[0053] According to some embodiments of the present application, the second insulation portion includes a second insulation member, at least part of the second insulation member is arranged between the third portion and the first wall, the second insulation member is formed with a seventh through hole and an eighth through hole, along the thickness direction of the first wall, the seventh through hole is arranged opposite to the fifth through hole, and the eighth through hole is arranged opposite to the sixth through hole.

[0054] In the above scheme, the second insulation member has a simple structure, on the one hand, the second electrode terminal passes through the seventh through hole, so that the second electrode terminal is electrically connected with the electrode assembly and realizes external charging and discharging, and the second deformation member deforms through the eighth through hole to contact the third portion, thereby realizing overcharge protection; on the other hand, the second insulation member can effectively insulate and isolate the third portion and the first wall, reduce the risk of internal short circuit of the battery cell caused by short circuit between the third portion and the first wall, and make the battery have high reliability.

[0055] According to some embodiments of the present application, the second insulation member includes a second body and a third flange, the second body is located between the third portion and the first wall, the third flange is arranged on the surface of the second body away from the first wall, and the third flange surrounds at least part of the outer circumferential surface of the third portion.

[0056] In the above scheme, by arranging the second body and the third flange, the first wall and the third portion can be effectively insulated and isolated, so that the third portion has a far creepage distance from the first wall, the second insulation member has high insulation performance, the risk of internal short circuit of the battery cell caused by short circuit between the first wall and the second electrode terminal is effectively reduced, and the battery has high reliability.

[0057] According to some embodiments of the present application, the second insulation member further includes a fourth flange, the fourth flange is arranged around the seventh through hole and located between the hole wall of the fifth through hole and the second electrode terminal.

[0058] In the scheme, the fourth flange can effectively insulate the hole wall of the fifth through hole and the second electrode terminal, reduce the risk of internal short circuit of the battery cell caused by the contact between the second electrode terminal and the hole wall of the fifth through hole, and effectively improve the reliability of the battery.

[0059] According to some embodiments of the application, the resistance value of the second insulation part is greater than or equal to 200 megaohms.

[0060] In the scheme, by setting the resistance value of the second insulation part to be greater than or equal to 200 megaohms, the insulation and high voltage resistance between the second electrode terminal and the first wall can be effectively improved, the insulation and voltage resistance demand of the energy storage device can be effectively met, the risk of internal short circuit of the battery cell caused by the breakdown of the second insulation part by external voltage to conduct the first wall and the second electrode terminal can be reduced, and the energy storage device has higher reliability.

[0061] According to some embodiments of the application, the resistance value of the first insulation part is greater than or equal to 200 megaohms.

[0062] In the scheme, by setting the resistance value of the first insulation part to be greater than or equal to 200 megaohms, the insulation and high voltage resistance between the first electrode terminal and the first wall can be effectively improved, the insulation and voltage resistance demand of the energy storage device can be effectively met, the risk of internal short circuit of the battery cell caused by the breakdown of the first insulation part by external voltage to conduct the first wall and the first electrode terminal can be reduced, and the energy storage device has higher reliability.

[0063] According to some embodiments of the application, the shell comprises a shell body and an end cover, and the shell body has an opening. The first wall is the end cover, and the end cover is connected with the shell body and closes the opening.

[0064] In the scheme, the shell structure is simple, facilitating the assembly of the battery cell and improving the battery manufacturing efficiency.

[0065] According to some embodiments of the application, the inner wall of the shell body is provided with a first insulation layer.

[0066] In the scheme, by setting the first insulation layer inside the shell body, the electrolyte inside the shell body can be effectively insulated and isolated from the inner wall of the shell body, thereby reducing the risk of corrosion of the shell body by the electrolyte and reducing the risk of electrolyte leakage, so that the battery has higher reliability.

[0067] According to some embodiments of the application, the first insulation layer is an insulation coating layer arranged on the inner wall of the shell body.

[0068] In the scheme, by arranging the insulating coating on the inner wall of the shell, on one hand, the electrolyte and the shell can be effectively separated, the ion path between the motor assembly and the shell is cut off, and the risk of corrosion of the shell is reduced; on the other hand, the first insulating layer can be efficiently formed on the inner wall of the shell by spraying or other methods, so that the manufacturing efficiency of the battery is high; in addition, the insulating coating has high mechanical strength, which can effectively reduce the risk of the battery cell internal short circuit caused by the metal particles introduced by the manufacturing process, or the risk of corrosion of the shell, so that the reliability of the battery is high.

[0069] According to some embodiments of the present application, along the first direction, the inner wall of the shell includes a blank area and an insulating area connected in sequence, the insulating area is provided with the first insulating layer, and the blank area is connected with the first wall, and the first direction is parallel to the direction in which the first wall points to the electrode assembly.

[0070] In the scheme, by arranging the blank area, the influence of the first insulating layer on the connection part of the shell and the first wall can be reduced. For example, the first wall and the shell are welded with each other, and by arranging the blank area, the welding quality between the first wall and the shell is good, so that the quality of the battery is high.

[0071] According to some embodiments of the present application, along the second direction, the projection of the electrode assembly on the inner wall of the shell does not coincide with the blank area, and the second direction is perpendicular to the first direction.

[0072] In the scheme, by arranging the electrode assembly and the blank area in a staggered manner, the risk of internal short circuit of the battery cell or corrosion of the shell caused by the overlap of the electrode assembly and the blank area can be reduced, the reliability of the battery cell can be effectively improved, and the reliability of the battery can be improved.

[0073] According to some embodiments of the present application, the thickness of the first insulating layer is greater than or equal to 60 μm and less than or equal to 200 μm.

[0074] In the scheme, by setting the thickness of the first insulating layer to be greater than or equal to 60 μm, the first insulating layer has high mechanical strength and insulation performance, can effectively isolate the shell and the electrolyte, reduce the risk of corrosion of the shell caused by the negative electricity, and make the battery have high reliability; by setting the thickness of the first insulating layer to be less than or equal to 200 μm, the occupation of the first insulating layer to the internal space of the battery cell can be effectively reduced, so that the battery cell has high volumetric energy density, and the battery has high volumetric energy density. Therefore, by setting the thickness of the first insulating layer to be greater than or equal to 60 μm and less than or equal to 200 μm, the reliability and volumetric energy density of the battery can be considered.

[0075] According to some embodiments of the present application, the thickness of the first insulating layer is greater than or equal to 80 μm and less than or equal to 130 μm.

[0076] In the above solution, by setting the thickness of the first insulating layer to be greater than or equal to 80 μm, the first insulating layer can have higher mechanical strength and insulation performance, effectively isolating the shell and the electrolyte, reducing the risk of corrosion of the shell by the electrolyte due to negative charging, and making the battery have higher reliability. By setting the thickness of the first insulating layer to be less than or equal to 130 μm, the first insulating layer can further reduce the occupation of the internal space of the battery monomer, so that the battery monomer has higher volumetric energy density, and the battery has higher volumetric energy density. Therefore, by setting the thickness of the first insulating layer to be greater than or equal to 80 μm and less than or equal to 130 μm, the reliability and volumetric energy density of the battery can be effectively balanced.

[0077] According to some embodiments of the present application, the outer surface of the shell is provided with a second insulating layer.

[0078] In the above solution, by providing the second insulating layer on the outer surface of the shell, the shell can be effectively insulated and protected, reducing the risk of corrosion of the shell by the electrolyte due to negative charging, and making the battery have higher reliability.

[0079] In a second aspect, some embodiments of the present application provide a battery comprising the battery monomer provided in the first aspect.

[0080] In a third aspect, some embodiments of the present application provide an energy storage device comprising the battery monomer provided in the first aspect.

[0081] In a fourth aspect, some embodiments of the present application provide an electric device comprising the battery monomer provided in the first aspect, and the battery monomer is used to provide electric energy.

[0082] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0083] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0084] FIG. 1 is a schematic view of a vehicle according to some embodiments of the present application;

[0085] FIG. 2 is a schematic diagram of an energy storage device in some embodiments of the application;

[0086] FIG. 3 is a perspective exploded view of a battery in some embodiments of the application;

[0087] FIG. 4 is a perspective exploded view of a battery cell in some embodiments of the application;

[0088] FIG. 5 is a perspective exploded view of a partial structure of a battery cell in some embodiments of the application;

[0089] FIG. 6 is a top view of a partial structure of a battery cell in some embodiments of the application;

[0090] FIG. 7 is a cross-sectional view along the A-A view of FIG. 6;

[0091] FIG. 8 is a schematic diagram of a first wall and a first electrode terminal in some embodiments of the application;

[0092] FIG. 9 is a schematic diagram of a first deformation member in some embodiments of the application;

[0093] FIG. 10 is a perspective view of a first wall in some embodiments of the application;

[0094] FIG. 11 is a schematic diagram of a partial structure of a first wall in some embodiments of the application;

[0095] FIG. 12 is a schematic diagram of a first wall and a second electrode terminal in some embodiments of the application;

[0096] FIG. 13 is a schematic diagram of a second deformation member in some embodiments of the application;

[0097] FIG. 14 is a schematic diagram of a partial structure of a first wall in some embodiments of the application;

[0098] FIG. 15 is a schematic diagram of a housing and an electrode assembly in some embodiments of the application;

[0099] FIG. 16 is a schematic diagram of a housing and a first insulating layer in some embodiments of the application;

[0100] FIG. 17 is a schematic diagram of a housing and a first insulating layer in some other embodiments of the application.

[0101] Icon: 10 - battery monomer; 11 - shell; 110 - first wall; 111 - shell body; 1100 - first through hole; 1101 - second through hole; 1102 - fifth through hole; 1103 - sixth through hole; 110a - body part; 110b - first reinforcing part; 110b0 - first protruding part; 110b1 - first recessed part; 110b2 - first positioning groove; 110c - second reinforcing part; 110c0 - second protruding part; 110c1 - second recessed part; 110c2 - second positioning groove; 12 - electrode assembly; 120 - first tab; 121 - second tab; 123 - first adapter; 124 - second adapter; 13 - first electrode terminal; 130 - first part; 131 - second part; 14 - first insulating part; 140 - first insulating piece; 1400 - first body; 14001 - third through hole; 14002 - fourth through hole; 1401 - first flange; 1402 - second flange; 141 - first sealing part; 15 - first deformation piece; 150 - first skirt; 151 - first reverse foil; 152 - first electrical connection part; 16 - second electrode terminal; 160 - third part; 161 - fourth part; 17 - second insulating part; 170 - second insulating piece; 1700 - second body; 17001 - seventh through hole; 17002 - eighth through hole; 1701 - third flange; 1702 - fourth flange; 171 - second sealing part; 18 - second deformation piece; 180 - second skirt; 181 - second reverse foil; 182 - second electrical connection part; 19 - first insulating layer; 19a - second insulating layer; 19b - blank area; z - thickness direction of the first wall; y - first direction; x - second direction; 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 2000 - energy storage device; 2001 - cabinet body; 20 - box body; 21 - first box body part; 22 - second box body part. DETAILED DESCRIPTION

[0102] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0103] 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.

[0104] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0105] 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 appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0106] 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 can mean: A exists, A and B exist, and B exists. In addition, the character " / " herein generally represents a "or" relationship between the front and rear associated objects.

[0107] 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).

[0108] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "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 therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0109] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery also needs to be considered.

[0114] With the development of battery technology, the operating voltage of the battery is getting larger and larger. For a single battery cell, a larger voltage is easy to conduct the first wall and the electrode terminal, causing internal short circuit of the battery cell, and affecting the reliability of the battery.

[0115] In view of this, in order to improve the problem of short circuit between the first wall and the electrode terminal, resulting in internal short circuit of the battery monomer and affecting the reliability of the battery, some embodiments of the present application provide a battery monomer. The battery monomer comprises a shell, an electrode assembly, a first electrode terminal and a first insulation part. The shell has a first wall. The electrode assembly is arranged in the shell. The first electrode terminal is arranged on the first wall and electrically connected with the electrode assembly, and the first electrode terminal is used for input and output of electric energy. The first insulation part is arranged between the first wall and the first electrode terminal, and is used for insulating and isolating the first electrode terminal and the first wall.

[0116] In the above scheme, by arranging the first insulation part between the first wall and the first electrode terminal, the first wall and the first electrode terminal can be effectively insulated and isolated, the risk of internal short circuit of the battery monomer caused by short circuit between the first wall and the first electrode terminal is reduced, and the reliability of the battery is high. Especially in the energy storage device with high working voltage, by arranging the first insulation part between the first wall and the first electrode terminal, the risk of heat runaway of the energy storage device caused by the high-voltage electricity of the shell due to the out-of-control of the remaining battery monomers in the battery, which leads to the conduction of the high-voltage electricity to the first wall and the electrode terminal and causes the internal short circuit of the battery monomer, can be effectively reduced.

[0117] The technical scheme described in the embodiments of the present application is applicable to the battery and the energy storage device using the battery and the power consumption device using the battery.

[0118] The energy storage device can include an energy storage container, an energy storage cabinet and the like. Exemplarily, the energy storage cabinet can include a cabinet body and one or more batteries arranged on the cabinet body.

[0119] The power consumption 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 and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, 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 power consumption device in the embodiments of the present application includes but is not limited to the above-mentioned.

[0120] The following embodiments are described for convenience with the power consumption device being a vehicle as an example.

[0121] FIG. 1 is a schematic diagram of a vehicle in some embodiments of the present application.

[0122] The interior of the vehicle 1000 can be provided with the controller 200, the motor 300 and the battery 100, the controller 200 being configured to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000, for example, the battery 100 can be used as the operating power source of the vehicle 1000, for example, to supply power to the circuit system of the vehicle 1000, for example, to meet the power demand of the vehicle 1000 during starting, navigation and operation. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, to replace or partially replace the fuel or natural gas to provide driving power to the vehicle 1000.

[0123] Referring to FIG. 2, FIG. 2 is a schematic diagram of an energy storage device according to some embodiments of the present application.

[0124] 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.

[0125] Referring to FIG. 3, FIG. 3 is a perspective exploded view of the battery 100 according to some embodiments of the present application.

[0126] The battery 100 includes a battery cell 10 and a box 20, the battery cell 10 being accommodated in the box 20. The box 20 is configured to provide an accommodation space for the battery cell 10, and the box 20 can have various structures. In some embodiments, the box 20 can include a first box part 21 and a second box part 22, the first box part 21 and the second box part 22 being overlapped with each other, and the first box part 21 and the second box part 22 together defining an accommodation space for accommodating the battery cell 10. The second box part 22 can be a hollow structure with one end being open, and the first box part 21 can be a plate structure, the first box part 21 being overlapped with the open end of the second box part 22 to define the accommodation space together with the second box part 22. Alternatively, the first box part 21 and the second box part 22 can both be hollow structures with one side being open, and the open side of the first box part 21 is overlapped with the open side of the second box part 22. Of course, the box 20 formed by the first box part 21 and the second box part 22 can have various shapes, such as a cylinder or a cuboid.

[0127] 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 box 20 by a connecting member (e.g., a bolt), or each battery cell 10 can be fixed to the box 20 by an adhesive.

[0128] Please refer to FIG. 4-FIG. 8, FIG. 4 is a perspective exploded view of the battery cell 10 in some embodiments of the present application, FIG. 5 is a perspective exploded view of a partial structure of the battery cell 10 in some embodiments of the present application, FIG. 6 is a top view of a partial structure of the battery cell 10 in some embodiments of the present application, FIG. 7 is a sectional view of the A-A view in FIG. 6, and FIG. 8 is a schematic view of the first wall and the first electrode terminal in some embodiments of the present application.

[0129] The battery cell 10 comprises a housing 11, an electrode assembly 12, a first electrode terminal 13, and a first insulation portion 14. The housing 11 has a first wall 110. The electrode assembly 12 is disposed in the housing 11. The first electrode terminal 13 is disposed on the first wall 110 and electrically connected with the electrode assembly 12, and the first electrode terminal 13 is used for input and output of electric energy. The first insulation portion 14 is disposed between the first wall 110 and the first electrode terminal 13, and is used for insulating and isolating the first electrode terminal 13 and the first wall 110.

[0130] The housing 11 is a component for accommodating the electrode assembly 12, and the housing 11 can also be used for accommodating an electrolyte, such as an electrolyte solution. Please refer to FIG. 4, in some embodiments, the housing 11 comprises a shell 111 and an end cover. The shell 111 has an inner portion formed with an accommodation cavity for accommodating the electrode assembly 12, and the shell 111 has an opening communicating with the accommodation cavity, and the end cover is coupled to the opening of the shell 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cover can be connected to the shell 111 by welding, bonding, clamping or other connection methods. Optionally, the housing 11 can also comprise a bottom plate, and the shell 111 has two openings at two ends respectively, one of which is closed by the end cover and the other of which is closed by the bottom plate.

[0131] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal, for example, the housing 11 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy, etc.; for another example, part of the housing 11 can be made of metal, and the remaining part can be made of non-metal, such as the end cover of the housing 11 can be made of metal, and the shell 111 or other parts of the housing 11 can be made of non-metallic material.

[0132] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed into the shell 111, and then the electrolyte is filled into the shell 111, and then the end cover is coupled to the opening of the shell 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be first placed into the shell 111, and then the end cover is coupled to the opening of the shell 111, and then the electrolyte is filled into the shell 111 through the liquid injection hole of the end cover, and then the liquid injection hole is closed to complete the assembly of the battery cell 10.

[0133] The housing 11 can have various shapes, such as a cylindrical or prismatic structure. The shape of the housing 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 has a cylindrical structure, a cylindrical housing 11 can be selected. If the electrode assembly 12 has a flat structure, the housing 11 can be square.

[0134] The first wall 110 is part of the housing 11. The first wall 110 can be used to support the first electrode terminal 13, so that the first electrode terminal 13 is in a stable state to achieve the input and output of electrical energy. In some embodiments, the first wall 110 can be part of the housing 111, such as a side wall or a bottom wall of the housing 111. In some embodiments, the first wall 110 can be an end cap.

[0135] The first electrode terminal 13 is a component mounted on the first wall 110, and is used to electrically connect with the electrode assembly 12, so that current flows into or out of the first tab 120 through the first electrode terminal 13. The first electrode terminal 13 and the first tab 120 have the same polarity. In some embodiments, the first electrode terminal 13 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the first electrode terminal 13 can be connected to the first tab 120 through a first adapter 123. For example, the first tab 120 of the electrode assembly 12 is composed of a plurality of first sub-tabs stacked together, and one end of the first adapter 123 can be welded to the first tab 120, and the other end of the first adapter 123 can be welded to the first electrode terminal 13.

[0136] The first insulating portion 14 has a high resistance value, which can insulate the first electrode terminal 13 from the first wall 110. For example, referring to FIG. 5, the first electrode terminal 13 has a first portion 130 exposed to the outside, and the first insulating portion 14 can be disposed between the outer side of the first wall 110 and the first portion 130 to insulate and separate the first electrode terminal 13 and the first wall 110. In some embodiments, the first insulating portion 14 can cover the outer periphery of the first portion 130, thereby increasing the creepage distance between the first electrode terminal 13 and the first wall 110.

[0137] Exemplarily, in some embodiments, the first wall 110 is formed with a first through hole 1100, and the first electrode terminal 13 can pass through the first through hole 1100 to form a first part 130 on the outside for connecting with an external electrical connection member and a second part 131 on the inside for electrical connection with the electrode assembly 12. The first insulation part 14 is formed with a third through hole 14001 corresponding to the first through hole 1100 for the first electrode terminal 13 to pass through. Optionally, a major part of the first insulation part 14 is located between the first part 130 and the first wall 110, and some parts of the first insulation part 14 can be located between the first through hole 1100 and the first electrode terminal 13. Optionally, a major part of the first insulation part 14 is located between the first part 130 and the first wall 110, some parts of the first insulation part 14 can be located between the first through hole 1100 and the first electrode terminal 13, and the remaining part of the first insulation part 14 can also be located between the first wall 110 and the second part 131.

[0138] In some embodiments, the first insulation part 14 as a whole can be in a plate shape, and both of its opposite surfaces are relatively flat to stably be located between the first electrode terminal 13 and the first wall 110.

[0139] In some embodiments, the first insulation part 14 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. Exemplarily, in some embodiments of the present application, the material of the first insulation part 14 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulation part 14 can also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0140] In some embodiments, the resistance value of the first insulation part 14 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 insulation part 14 can be greater than or equal to 200 MΩ. In other embodiments, the resistance value of the first insulation part 14 can be other values, such as 1 MΩ, 10 MΩ, 20 MΩ, 30 MΩ, 40 MΩ, 50 MΩ, 60 MΩ, 70 MΩ, 80 MΩ, 90 MΩ, 100 MΩ, 110 MΩ, 120 MΩ, 130 MΩ, 210 MΩ, 220 MΩ, 230 MΩ, etc.

[0141] In the above scheme, by arranging the first insulation part 14 between the first wall 110 and the first electrode terminal 13, the first wall 110 and the first electrode terminal 13 can be effectively insulated and isolated, and the risk of internal short circuit of the battery cell 10 caused by short circuit between the first wall 110 and the first electrode terminal 13 can be reduced, so that the reliability of the battery is high. In particular, in the energy storage device with high working voltage, by arranging the first insulation part 14 between the first wall 110 and the first electrode terminal 13, the risk of thermal runaway of the energy storage device caused by the high-voltage electricity of the shell 11 leading to the conduction of the first wall 110 and the electrode terminal to cause the internal short circuit of the battery cell 10 due to the out-of-control of the remaining battery cells 10 in the battery can be effectively reduced.

[0142] According to some embodiments of the present application, referring to FIG. 5, FIG. 8 and FIG. 9, FIG. 9 is a schematic view of the first deformation part 15 in some embodiments of the present application. The battery cell 10 further comprises a first deformation part 15, the first deformation part 15 is electrically connected with the first wall 110, and the first deformation part 15 is configured to be deformable to contact the first electrode terminal 13 to electrically connect the first electrode terminal 13 with the first wall 110.

[0143] The first deformation part 15 is mounted on the first wall 110 and electrically connected with the first wall 110. In some embodiments, the first deformation part 15 can be made of a metal material, for example, the first deformation part 15 is made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first deformation part 15 can be welded to the inner side of the first wall 110.

[0144] The first deformation part 15 is a structure that deforms under the internal pressure of the battery cell 10. The first deformation part 15 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse working condition such as overcharge, the internal pressure increases, and when the internal pressure reaches a first threshold value, the first deformation part 15 deforms to contact the first electrode terminal 13, thereby conducting the first wall 110 and the first electrode terminal 13, so that the positive and negative electrodes in the battery cell 10 are short-circuited.

[0145] In some embodiments, the part of the first deformation part 15 that deforms under pressure to contact the first electrode terminal 13 can be the part of the first electrode terminal 13 on the inner side of the first wall 110, or the part of the first electrode terminal 13 on the outer side of the first wall 110, for example, the first deformation part 15 deforms to connect with the second part 131 when the internal pressure of the battery cell 10 reaches the first threshold value, or for example, the first deformation part 15 deforms to connect with the first part 130 when the internal pressure of the battery cell 10 reaches the first threshold value.

[0146] In some embodiments, the first deformation member 15 can be a flip tab that flips under pressure. For example, referring to FIGS. 5 and 9, the first deformation member 15 has a disc shape and includes, from outside to inside, a first skirt 150, a first flip tab 151, and a first electrical connection portion 152 connected in sequence. The first skirt 150 can be connected to the first wall 110. The first flip tab 151 is thin and is configured to deform and flip under pressure. After the first flip tab 151 flips, the first electrical connection portion 152 is pushed towards the first electrode terminal 13, so that the first electrical connection portion 152 contacts the first electrode terminal 13.

[0147] For example, the first wall 110 has a second through hole 1101, and the first skirt 150 is welded to the first wall 110, so that the first deformation member 15 closes the second through hole 1101. In a natural state, the first flip tab 151 collapses in a direction away from the first wall 110. When the internal pressure of the battery cell 10 reaches a certain level, for example, a first threshold, the first flip tab 151 flips in a direction facing the first wall 110, so as to push the first electrical connection portion 152, so that the first electrical connection portion 152 passes through the second through hole 1101 and contacts the first part 130.

[0148] In some embodiments, the first electrode terminal 13 is electrically connected to the first tab 120 through a first adapter 123. The second tab 121 of the electrode assembly 12 can be electrically connected to the case 11. The second tab 121 has an opposite polarity to the first tab 120. For example, the second tab 121 is directly or through a second adapter 124 connected to the case 11, or the case 11 is provided with a second electrode terminal 16, the second electrode terminal 16 is electrically connected to the case 11, and the second tab 121 is directly or through a second adapter 124 connected to the second electrode terminal 16. When the internal pressure of the battery cell 10 reaches the first threshold, the first deformation member 15 deforms to short the first electrode terminal 13 and the case 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause internal short circuit. A 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 of overcharge protection. The melted electrical connection member can include the first adapter 123 and / or the second adapter 124. For example, the first adapter 123 has a first melting portion, and the overcurrent area of the first melting portion can be smaller than that of the rest of the first adapter 123, so that the first melting portion melts when a large current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. For example, the second adapter 124 has a second melting portion, and the overcurrent area of the second melting portion can be smaller than that of the rest of the second adapter 124, so that the second melting portion melts when a large current passes through, thereby breaking the current path of the second tab 121 and the second electrode terminal 16 or the case 11.

[0149] In some embodiments, the first electrode terminal 13 is electrically connected with the first tab 120 through a first adapter 123, the second tab 121 of the electrode assembly 12 can be electrically connected with a second electrode terminal 16, the second tab 121 is opposite in polarity to the first tab 120, the second electrode terminal 16 can be insulatively mounted to the housing 11, for example, insulatively mounted to the first wall 110 of the housing 11. The second tab 121 can be electrically connected with the second electrode terminal 16 through a second adapter 124. The second electrode terminal 16 is correspondingly provided with a second deformation member 18, the second deformation member 18 is electrically connected to the housing 11, the second deformation member 18 is configured to be deformable to contact the second electrode terminal 16 to electrically connect the second electrode terminal 16 with the housing 11. For example, the second deformation member 18 is configured to be deformed to contact the second electrode terminal 16 to electrically connect the second electrode terminal 16 with the housing 11 when the internal pressure of the battery cell 10 reaches a second threshold value.

[0150] When the internal pressure of the battery cell 10 reaches a certain degree, for example, a first threshold value, the first deformation member 15 deforms to short the first electrode terminal 13 and the housing 11, when the internal pressure of the battery cell 10 reaches a second threshold value, the second deformation member 18 deforms to short the second electrode terminal 16 with the housing 11, thereby shorting the positive and negative electrodes inside the battery cell 10 to cause internal short circuit, and the large current generated instantaneously can fuse the electrical connection member inside the battery cell 10 to cut off the charge and discharge circuit of the battery cell 10, thereby playing a role of overcharge protection. The fused electrical connection member can include the first adapter 123 and / or the second adapter 124. For example, the first adapter 123 has a first fuse portion, the overcurrent area of the first fuse portion can be smaller than that of the rest of the first adapter 123, so that the first fuse portion can be fused to disconnect the current path of the first tab 120 and the first electrode terminal 13 when a large current passes through. For example, the second adapter 124 has a second fuse portion, the overcurrent area of the second fuse portion can be smaller than that of the rest of the second adapter 124, so that the second fuse portion can be fused to disconnect the current path of the second tab 121 and the second electrode terminal 16 when a large current passes through.

[0151] In the above scheme, by providing the first deformation member 15, when the internal pressure of the battery cell 10 reaches a certain degree, for example, a first threshold value, the first deformation member 15 deforms to contact the first electrode terminal 13, thereby electrically connecting the first electrode terminal 13 with the first wall 110, realizing internal short circuit of the battery cell 10, so that the electrical connection member inside the battery cell 10 is fused due to the large current generated by the short circuit to cut off the charge and discharge 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, thereby making the battery have higher reliability.

[0152] According to some embodiments of the present application, please refer to FIG. 8, FIG. 10 and FIG. 11, FIG. 10 is a perspective view of the first wall 110 according to some embodiments of the present application, and FIG. 11 is a schematic view of a partial structure of the first wall 110 according to some embodiments of the present application.

[0153] The first wall 110 is formed with a first through hole 1100 for the first electrode terminal 13 to pass through and a second through hole 1101 for the first deformation member 15 to pass through.

[0154] In some embodiments, along the thickness direction z of the first wall, the first electrode terminal 13 includes a first portion 130 located outside the first wall 110 and a second portion 131 at least partially located inside the first wall 110. The second portion 131 is configured to electrically connect with the electrode assembly 12 of the battery cell 10.

[0155] In some embodiments, the first wall 110 can be an end cover of the housing 11, and the first wall 110 can be in a plate shape. Along the thickness direction z of the first wall, the first wall 110 is formed with a first through hole 1100 and a second through hole 1101. The first through hole 1100 is for the first electrode terminal 13 to pass through, and the second through hole 1101 is for the first deformation member 15 to pass through.

[0156] For example, please refer to FIG. 8, the first electrode terminal 13 includes a first portion 130 and a second portion 131. The first portion 130 is located outside the first wall 110 and can be in a flat plate shape to electrically connect with an external structure. The second portion 131 is partially located inside the first wall 110 to electrically connect with the electrode assembly 12, and the other part of the second portion 131 is connected with the first portion 130 through the first through hole 1100. The connection relationship between the second portion 131 and the first portion 130 includes but is not limited to welding, bonding, riveting or threaded connection, etc. In other embodiments, the first portion 130 can be partially located outside the first wall 110, and the other part of the first portion 130 can be connected with the second portion 131 through the first through hole 1100. In other embodiments, the first portion 130 can be partially located outside the first wall 110, and the second portion 131 can be partially located inside the first wall 110. The other part of the first portion 130 and the other part of the second portion 131 are located in the first through hole 1100 and connected with each other.

[0157] The "first deformation piece 15 closes the second through hole 1101" can mean that the first deformation piece 15 closes the second through hole 1101, so that the electrode assembly 12 and the electrolyte are in a closed space. In some embodiments, the first skirt 150 of the first deformation piece 15 is arranged around the edge of the second through hole 1101 and is welded to the inner side of the first wall 110.

[0158] In some embodiments, when the internal pressure of the battery cell 10 reaches the first threshold, the first deformation piece 15 can deform towards the first portion 130 to contact the first portion 130 through the second through hole 1101.

[0159] In some embodiments, the second through hole 1101 can be a stepped hole, which can provide a connection site for the first skirt 150 of the first deformation piece 15, so that the first skirt 150 can be accommodated in the second through hole 1101, reducing the occupation of the internal space of the battery cell 10 by the first deformation piece 15.

[0160] In the above scheme, when the internal pressure of the battery cell 10 reaches a certain degree, for example, the first threshold, the internal pressure of the battery cell 10 can act on the first deformation piece 15, so that the first deformation piece 15 deforms towards the outer side of the first wall 110 to effectively contact the first portion 130 of the first electrode terminal 13, thereby effectively realizing the internal short circuit of the battery cell 10, so that the electric connection member in the battery cell 10 is melted 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 reducing the risk of thermal runaway of the battery cell 10, and thus making the battery have higher reliability.

[0161] According to some embodiments of the present application, referring to FIG. 8, along the thickness direction z of the first wall, the projection of the first portion 130 located on the outer side of the first wall 110 at least partially overlaps the projection of the first deformation piece 15.

[0162] In some embodiments, the first portion 130 is large in size, and along the thickness direction z of the first wall, a part of the first portion 130 can be arranged opposite to the second portion 131 to connect with the second portion 131, and a part of the first portion 130 can be arranged opposite to the first deformation piece 15 to directly contact the first deformation piece 15 when the first deformation piece 15 deforms.

[0163] In some embodiments, along the thickness direction z of the first wall, the projection of the first deformation piece 15 can fall on the first portion 130 entirely. In other embodiments, along the thickness direction z of the first wall, the projection of the first deformation piece 15 can fall on the first portion 130 partially, and the other part is staggered with the first portion 130.

[0164] In the above scheme, by arranging the first deformation member 15 along the thickness direction z of the first wall corresponding to the first portion 130, the first portion 130 can be quickly contacted with a small deformation amount when the pressure inside the battery cell 10 reaches a certain degree, for example, the first threshold value, so as to quickly make the first electrode terminal 13 and the first wall 110 electrically connected, thereby effectively realizing the internal short circuit of the battery cell 10, so that the electrically connecting member inside the battery cell 10 is fused 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 in reducing the risk of thermal runaway of the battery cell 10, and further making the battery have higher reliability.

[0165] According to some embodiments of the present application, referring to FIGS. 10 and 11, the first wall 110 includes a body portion 110a and a first reinforcing portion 110b connected to each other, and the first portion 130 is arranged on the first reinforcing portion 110b.

[0166] In some embodiments, the first reinforcing portion 110b plays a role in strengthening the overall structural strength of the first wall 110 or strengthening the local structural strength of the first wall 110, so that the first wall 110 has higher impact resistance and reduces the risk of deformation of the first wall 110. In some embodiments, the first reinforcing portion 110b can be a reinforcing rib, a concave-convex structure, or the like.

[0167] In some embodiments, the first wall 110 includes the body portion 110a and the first reinforcing portion 110b arranged on the surface of the body portion 110a, the material of the first reinforcing portion 110b is the same as that of the body portion 110a, and the thickness of the first wall 110 at the position of the first reinforcing portion 110b is larger, so that the position has larger structural strength.

[0168] In some embodiments, the first wall 110 includes the body portion 110a, the body portion 110a is stamped to form a convex portion on one side and a concave portion on the other side, and the positions of the convex portion and the concave portion form the first reinforcing portion 110b.

[0169] In other embodiments, the first wall 110 includes the body portion 110a and the first reinforcing portion 110b, the body portion 110a is arranged around the edge of the first reinforcing portion 110b, the material of the first reinforcing portion 110b can be the same as or different from that of the body portion 110a, and the structural strength of the first reinforcing portion 110b is greater than that of the body portion 110a.

[0170] The "first portion 130 is arranged on the first reinforcing portion 110b" can be understood as that the position of the first wall 110 for supporting the first portion 130 is a part of the first wall 110 with larger structural strength.

[0171] In the above scheme, by arranging the first reinforcing portion 110b, the overall strength of the first wall 110 can be improved, and the risk that the first wall 110 is deformed due to internal pressure of the battery monomer 10 or external impact, so that the first deformation member 15 cannot effectively contact the first part 130 to conduct the first electrode terminal 13 and the first wall 110, can be reduced. The first deformation member 15 can effectively contact the first electrode terminal 13 under abuse conditions such as overcharging of the battery monomer 10, thereby effectively playing a role of overcharge protection, reducing the risk of thermal runaway of the battery monomer 10, and making the battery have higher reliability.

[0172] In some embodiments, the body portion 110a can be arranged around the edge of the first reinforcing portion 110b.

[0173] In some embodiments, the first reinforcing portion 110b can be concave-convex with respect to the body portion 110a, so that the structural strength of the first reinforcing portion 110b is greater than that of the body portion 110a. In other embodiments, the thickness of the first reinforcing portion 110b can be greater than that of the body portion 110a, so that the structural strength of the first reinforcing portion 110b is greater than that of the body portion 110a. By arranging the structural strength of the first reinforcing portion 110b to be greater than that of the body portion 110a, on the one hand, the overall strength of the first wall 110 can be effectively improved, and on the other hand, the local part of the first wall 110 corresponding to the first part 130 can have stronger structural strength, so that the first part 130 effectively cooperates with the first deformation member 15, and the reliability of overcharge protection is improved.

[0174] According to some embodiments of the present application, referring to FIG. 6, the length of the first wall is greater than or equal to 150 mm, and the width of the first wall is greater than or equal to 45 mm.

[0175] In some embodiments, the battery monomer 10 can be a square battery monomer, and the first wall 110 can be an end cover of the shell 11. In order to make the battery monomer 10 have greater capacity, the volume of the shell 11 can be designed to be larger, and therefore the size of the end cover is larger. In some embodiments, referring to FIG. 6, the size of the end cover in the length direction is marked as C, that is, the length C of the first wall 110 can be greater than or equal to 150 mm, for example, the value of C is 150 mm, 160 mm, 170 mm, 180 mm, a larger value or any value between adjacent two values. The size of the end cover in the width direction is marked as D, that is, the width D of the first wall 110 can be greater than or equal to 45 mm, for example, the value of D is 45 mm, 55 mm, 65 mm, 75 mm, a larger value or any value between adjacent two values.

[0176] The length direction of the end cover can be the direction in which the end cover has the largest dimension, the width direction of the end cover can be the direction in which the end cover has a smaller dimension, and the width direction of the end cover, the length direction of the end cover, and the thickness direction of the end cover can be perpendicular to each other in pairs.

[0177] In the above scheme, by arranging the first reinforcing portion 110b on the first wall 110 with a larger dimension, the structural strength lost due to the increase in the dimension of the first wall 110 can be effectively compensated, the overall strength of the first wall 110 can be improved, the risk that the first wall 110 is deformed under the action of internal pressure of the battery monomer 10 or external impact, so that the first deformation member 15 cannot effectively contact the first part 130 to conduct the first electrode terminal 13 and the first wall 110 can be reduced, the first deformation member 15 can effectively contact the first electrode terminal 13 under the abuse condition such as overcharge of the battery monomer 10, thereby effectively playing the role of overcharge protection, reducing the risk of thermal runaway of the battery monomer 10, and making the battery have higher reliability.

[0178] According to some embodiments of the present application, referring to FIG. 10, the first reinforcing portion 110b includes a first protruding portion 110b0, which protrudes from one surface of the body portion 110a in the thickness direction z of the first wall.

[0179] In some embodiments, the first reinforcing portion 110b includes a first protruding portion 110b0, which protrudes from a surface of the first wall 110. For example, the first protruding portion 110b0 protrudes from the outer side surface of the first wall 110; or the first protruding portion 110b0 protrudes from the inner side surface of the first wall 110.

[0180] In some embodiments, the first wall 110 can include a body portion 110a, and the body portion 110a can define a first reinforcing region. The first protruding portion 110b0 can be arranged in the first reinforcing region, and the part where the first reinforcing region is located can be regarded as the first reinforcing portion 110b. The first part 130 can be arranged in the first reinforcing region, for example, the first part 130 is arranged on the surface of the first protruding portion 110b0 away from the body portion 110a, and for another example, the first part 130 can be arranged on the part of the body portion 110a away from the first protruding portion 110b0. In some embodiments, the first protruding portion 110b0 and the body portion 110a can be a split structure, for example, the first protruding portion 110b0 is arranged in layers on the body portion 110a, and the connection relationship between the first protruding portion 110b0 and the body portion 110a includes but is not limited to adhesion, welding, riveting, or threaded connection. In some embodiments, the first protruding portion 110b0 and the body portion 110a can be an integral structure, which is integrally formed by stamping, casting, or other processes.

[0181] In the above scheme, the first protrusion 110b0 is arranged to enhance the structural strength of the first wall 110, so as to effectively reduce the risk that the first wall 110 is deformed due to the internal pressure of the battery cell 10 or external impact, and the first deformation member 15 cannot effectively contact the first portion 130 to conduct the first electrode terminal 13 and the first wall 110, so that the battery has higher reliability.

[0182] According to some embodiments of the present application, referring to FIG. 11, the first reinforcing portion 110b further includes a first recess 110b1, which is arranged on the other surface of the body portion 110a along the thickness direction z of the first wall, and is arranged opposite to the first protrusion 110b0.

[0183] The first recess 110b1 is a portion corresponding to the first protrusion 110b0. For example, when the first protrusion 110b0 is located on the outer side of the first wall 110, the first recess 110b1 is located on the inner side of the first wall 110; conversely, when the first protrusion 110b0 is located on the inner side of the first wall 110, the first recess 110b1 is located on the outer side of the first wall 110.

[0184] In some embodiments, the first wall 110 can be formed by stamping to form the first protrusion 110b0 and the first recess 110b1. For example, along the thickness direction z of the first wall, the stamping head is stamped from the inner side to the outer side of the first wall 110 to form the first protrusion 110b0 on the outer side of the first wall 110 and the first recess 110b1 on the inner side of the first wall 110.

[0185] In some embodiments of the present application, the first recess 110b1 is located on the inner side of the first wall 110, and at least part of the first deformation member 15 and the second portion 131 is located in the first recess 110b1.

[0186] In the above scheme, the first recess 110b1 is arranged at a position corresponding to the first protrusion 110b0, which can reduce the difficulty of forming the first protrusion 110b0 and save material costs, and on the other hand, if the first recess 110b1 is located on the inner side of the first wall 110, more active material or electrolyte can be accommodated in the space of the first recess 110b1, which is beneficial to improve the energy density or charge-discharge performance of the battery cell 10, or the first deformation member 15 and the first electrode terminal 13 can use the space of the first recess 110b1 to reduce the occupation of the internal space of the battery cell 10; if the first recess 110b1 is located on the outer side of the first wall 110, external structural members can be accommodated in the space of the first recess 110b1, which is beneficial to improve the volume energy density of the battery.

[0187] According to some embodiments of the present application, please refer to FIG. 8 and FIG. 11. The first protrusion 110b0 is located on the outer side of the first wall 110, and the first protrusion 110b0 is formed with a first positioning groove 110b2, which accommodates the first part 130 to limit the movement of the first part 130.

[0188] In some embodiments, the first protrusion 110b0 is located on the outer side of the first wall 110, and the first part 130 can be arranged on the first protrusion 110b0.

[0189] The first positioning groove 110b2 is a groove structure formed on the first protrusion 110b0, and the first part 130 is located in the first positioning groove 110b2. For example, the first protrusion 110b0 has a top surface facing away from the electrode assembly 12, and the first positioning groove 110b2 is a square groove formed on the top surface. The square-shaped first part 130 and part of the first insulating portion 14 are located in the first positioning groove 110b2. The first insulating portion 14 is clamped by the groove wall of the first positioning groove 110b2 and the outer peripheral surface of the first part 130.

[0190] In the above scheme, by arranging the first positioning groove 110b2, the first electrode terminal 13 can be effectively positioned and the displacement of the first electrode terminal 13 is limited. On the one hand, the risk of the first electrode terminal 13 being separated from the internal electrical connection member of the battery monomer 10 to cause internal disconnection of the battery monomer 10 is reduced. On the other hand, the first electrode terminal 13 can be effectively matched with the first deformation piece 15 to play a role of overcharge protection, thereby improving the reliability of the battery.

[0191] According to some embodiments of the present application, the first protrusion 110b0 is located on the outer side of the first wall 110, and the size of the first protrusion 110b0 protruding from the body portion 110a along the thickness direction z of the first wall is greater than or equal to 0.1 mm and less than or equal to 5 mm.

[0192] In some embodiments, referring to FIG. 11, the size of the first protrusion 110b0 protruding from the body portion 110a along the thickness direction z of the first wall is L1, and the value of L1 is greater than or equal to 0.1 mm and less than or equal to 5 mm. For example, the value of L1 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, …, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, …, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, or any value between any two adjacent values.

[0193] In the above scheme, by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be greater than or equal to 0.1 mm, the structural strength of the first wall 110 can be effectively improved, so that the first deformation piece 15 effectively contacts the first electrode terminal 13 when the internal pressure of the battery monomer 10 reaches a certain degree, for example, a first threshold, to play a role of overcharge protection, thereby improving the reliability of the battery; by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be less than or equal to 5 mm, the occupation of space by the first protrusion 110b0 can be reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be greater than or equal to 0.1 mm and less than or equal to 5 mm, the reliability of the overcharge protection of the battery monomer 10 and the volume energy density of the battery can be considered.

[0194] According to some embodiments of the present application, along the thickness direction z of the first wall, the size of the first protrusion 110b0 protruding from the body portion 110a is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0195] In some embodiments, along the thickness direction z of the first wall, the size of the first protrusion 110b0 protruding from the body portion 110a is L1, and the value of L1 is greater than or equal to 0.5 mm and less than or equal to 3 mm. For example, the value of L1 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, or any value between any two adjacent values.

[0196] In the above scheme, by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be greater than or equal to 0.5 mm, the structural strength of the first wall 110 can be further improved, so that the first deformation piece 15 effectively contacts the first electrode terminal 13 when the internal pressure of the battery monomer 10 reaches a first threshold, to play a role of overcharge protection, thereby improving the reliability of the battery; by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be less than or equal to 3 mm, the occupation of space by the first protrusion 110b0 can be effectively reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the size of the first protrusion 110b0 protruding from the body portion 110a to be greater than or equal to 0.5 mm and less than or equal to 3 mm, the reliability of the overcharge protection of the battery monomer 10 and the volume energy density of the battery can be considered.

[0197] According to some embodiments of the present application, referring to FIG. 5, FIG. 7 and FIG. 8, the first insulation part 14 includes a first insulation piece 140, at least a portion of the first insulation piece 140 is arranged between the first portion 130 and the first wall 110, the first insulation piece 140 is formed with a third through hole 14001 and a fourth through hole 14002, the third through hole 14001 is arranged opposite to the first through hole 1100 along the thickness direction z of the first wall, and the fourth through hole 14002 is arranged opposite to the second through hole 1101.

[0198] In some embodiments, referring to FIG. 5, the first insulation piece 140 can be regarded as a plate-shaped structure arranged between the first portion 130 and the first wall 110 to insulate and separate the first portion 130 and the first wall 110. The first insulation piece 140 has the third through hole 14001 and the fourth through hole 14002 penetrating along the thickness direction z of the first wall, the third through hole 14001 is arranged corresponding to the first through hole 1100 for the first electrode terminal 13 to pass through, and the fourth through hole 14002 is arranged corresponding to the second through hole 1101 for the first deformation piece 15 to pass through after deformation to contact the first portion 130.

[0199] In some embodiments, the third through hole 14001 can be a square hole, a circular hole or other shapes. The fourth through hole 14002 can be a square hole, a circular hole or other shapes.

[0200] In some embodiments, the third through hole 14001 and the first through hole 1100 can be circular holes, the diameter of the third through hole 14001 can be smaller than or equal to the diameter of the first through hole 1100. In some embodiments, the fourth through hole 14002 and the second through hole 1101 can be circular holes, the diameter of the fourth through hole 14002 can be smaller than or equal to the diameter of the second through hole 1101.

[0201] Exemplarily, in some embodiments of the present application, the material of the first insulation piece 140 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulation piece 140 can also be made of polypropylene, polyethylene or other materials with insulating properties. Exemplarily, in the battery cell 10 provided by some embodiments of the present application, the resistance value of the first insulation piece 140 can be greater than or equal to 200 MΩ.

[0202] In the above scheme, the first insulating piece 140 is simple in structure, on the one hand, the first electrode terminal 13 passes through the third through hole 14001, so that the first electrode terminal 13 is electrically connected with the electrode assembly 12 and realizes external charging and discharging, and the first deformation piece 15 deforms through the fourth through hole 14002 to be able to contact the first part 130, and overcharge protection is realized; on the other hand, the first insulating piece 140 can effectively insulate and isolate the first part 130 and the first wall 110, reduce the risk of internal short circuit of the battery monomer 10 caused by short circuit between the first part 130 and the first wall 110, and make the reliability of the battery high.

[0203] According to some embodiments of the present application, referring to FIG. 8, the first insulating piece 140 comprises a first body 1400 and a first flange 1401, the first body 1400 is located between the first part 130 and the first wall 110, the first flange 1401 is arranged on the surface of the first body 1400 away from the first wall 110, and the first flange 1401 surrounds at least part of the outer circumferential surface of the first part 130.

[0204] In some embodiments, the first body 1400 is clamped between the first part 130 and the first wall 110, and the first body 1400 is in the form of a flat plate as a whole. The first flange 1401 is protruded from the surface of the first body 1400 and surrounds the outer circumferential surface of the first part 130.

[0205] The "first flange 1401 surrounds at least part of the outer circumferential surface of the first part 130" can be understood as that the first flange 1401 can cover the entire outer circumferential surface of the first part 130 or the first flange 1401 can cover part of the outer circumferential surface of the first part 130.

[0206] In some embodiments, referring to FIG. 8, the first insulating piece 140 wraps the first part 130 and is in the first positioning groove 110b2, and the first flange 1401 is between the outer circumferential surface of the first part 130 and the groove wall of the first positioning groove 110b2.

[0207] In the above scheme, by arranging the first body 1400 and the first flange 1401, the first wall 110 and the first part 130 can be effectively insulated and isolated, so that the first part 130 has a far creepage distance from the first wall 110, so that the first insulating piece 140 has high insulation performance, effectively reduces the risk of internal short circuit of the battery monomer 10 caused by short circuit between the first wall 110 and the first electrode terminal 13, and makes the reliability of the battery high.

[0208] According to some embodiments of the present application, referring to FIG. 8, the first insulating piece 140 further comprises a second flange 1402, the second flange 1402 is arranged around the third through hole 14001 and is located between the hole wall of the first through hole 1100 and the first electrode terminal 13.

[0209] The second flange 1402 is part of the first insulating member 140, and is connected to the first body 1400 and arranged around the third through hole 14001. In the thickness direction z of the first wall, the second flange 1402 protrudes towards the first through hole 1100 to cover part of the hole wall of the first through hole 1100, thereby insulating and isolating the first electrode terminal 13 from the hole wall of the first through hole 1100. In some embodiments, the second flange 1402 also has a positioning function. Through the mutual positioning of the second flange 1402 and the first through hole 1100, the first insulating member 140 can be quickly assembled on the first wall 110.

[0210] In some embodiments, the second flange 1402 can partially or completely cover the hole wall of the first through hole 1100.

[0211] In the above scheme, by arranging the second flange 1402, the hole wall of the first through hole 1100 and the first electrode terminal 13 can be effectively insulated and isolated, reducing the risk of internal short circuit of the battery cell 10 caused by contact between the first electrode terminal 13 and the hole wall of the first through hole 1100, and effectively improving the reliability of the battery.

[0212] In some embodiments, referring to FIGS. 5 and 8, the first insulating part 14 can further include a first sealing part 141, which can be sleeved on the second part 131. Part of the first sealing part 141 is clamped between the first through hole 1100 and the second part 131, and another part of the first sealing part 141 can be clamped between the surface of the first wall 110 facing away from the first part 130 and the second part 131.

[0213] According to some embodiments of the present application, referring to FIGS. 4-13, FIG. 12 is a schematic view of the first wall and the second electrode terminal in some embodiments of the present application, and FIG. 13 is a schematic view of the second deformation member 18 in some embodiments of the present application.

[0214] The battery cell 10 further includes a second electrode terminal 16, a second insulating part 17, and a second deformation member 18. The second electrode terminal 16 is arranged on the first wall 110 and electrically connected to the electrode assembly 12. The second electrode terminal 16 is used for input and output of electric energy, and the polarity of the second electrode terminal 16 is opposite to that of the first electrode terminal 13. The second insulating part 17 is arranged between the first wall 110 and the second electrode terminal 16, and is used for insulating and isolating the second electrode terminal 16 from the first wall 110. The second deformation member 18 is electrically connected to the first wall 110, and is configured to be deformable to contact the second electrode terminal 16, so as to electrically connect the second electrode terminal 16 to the first wall 110.

[0215] The second electrode terminal 16 is a component mounted on the first wall 110, and is used to electrically connect with the electrode assembly 12, so as to make current flow into or out of the second tab 121 through the second electrode terminal 16. The second electrode terminal 16 and the second tab 121 have the same polarity. In some embodiments, when the first electrode terminal 13 is a positive electrode terminal, the second electrode terminal 16 is a negative electrode terminal. When the first electrode terminal 13 is a negative electrode terminal, the second electrode terminal 16 is a positive electrode terminal.

[0216] In some embodiments, the second electrode terminal 16 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the second electrode terminal 16 can be connected with the second tab 121 through a second adapter 124. For example, the second tab 121 of the electrode assembly 12 is composed of a plurality of second sub-tabs stacked together, and one end of the second adapter 124 can be welded with the second tab 121, and the other end of the second adapter 124 can be welded with the second electrode terminal 16.

[0217] The second insulation portion 17 has a high resistance value, and can insulate the second electrode terminal 16 from the first wall 110. For example, referring to FIG. 5, the second electrode terminal 16 has a third portion 160 exposed to the outside, and the second insulation portion 17 can be arranged between the outer side of the first wall 110 and the third portion 160 to insulate and separate the second electrode terminal 16 and the first wall 110. In some embodiments, the second insulation portion 17 can cover the outer periphery of the third portion 160, so as to increase the creepage distance between the second electrode terminal 16 and the first wall 110.

[0218] For example, in some embodiments, the first wall 110 has a fifth through hole 1102 formed therein, and the second electrode terminal 16 can pass through the fifth through hole 1102 to form a third portion 160 on the outside and a fourth portion 161 on the inside, the third portion 160 being used to connect with an external electrical connection component, and the fourth portion 161 being used to electrically connect with the electrode assembly 12. The second insulation portion 17 has a seventh through hole 17001 formed corresponding to the fifth through hole 1102, so as to allow the second electrode terminal 16 to pass through. Optionally, the main part of the second insulation portion 17 is located between the third portion 160 and the first wall 110, and some parts of the second insulation portion 17 can be located between the fifth through hole 1102 and the second electrode terminal 16. Optionally, the main part of the second insulation portion 17 is located between the third portion 160 and the first wall 110, some parts of the second insulation portion 17 can be located between the fifth through hole 1102 and the second electrode terminal 16, and the remaining part of the second insulation portion 17 can also be located between the first wall 110 and the fourth portion 161.

[0219] In some embodiments, the second insulation part 17 can be in a plate shape as a whole, and both of its opposite surfaces can be relatively flat, so as to be stably arranged between the second electrode terminal 16 and the first wall 110.

[0220] In some embodiments, the second insulation part 17 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 second insulation part 17 can include an insulation PPS (polyphenylene sulfide) material. In other embodiments, the second insulation part 17 can also be made of other materials with insulation properties, such as polypropylene or polyethylene.

[0221] In some embodiments, the resistance value of the second insulation part 17 can be in units of megaohms (MΩ). For example, in some embodiments of the battery cell 10 provided by the present application, the resistance value of the second insulation part 17 can be greater than or equal to 200 MΩ. In other embodiments, the resistance value of the second insulation part 17 can be other values, such as 1 MΩ, 10 MΩ, 20 MΩ, 30 MΩ, 40 MΩ, 50 MΩ, 60 MΩ, 70 MΩ, 80 MΩ, 90 MΩ, 100 MΩ, 110 MΩ, 120 MΩ, 130 MΩ, 210 MΩ, 220 MΩ, 230 MΩ, and the like.

[0222] The second deformation part 18 is mounted to the first wall 110, and the second deformation part 18 is electrically connected to the first wall 110. In some embodiments, the second deformation part 18 can be made of a metal material, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the second deformation part 18 can be welded to the inner side of the first wall 110.

[0223] The second deformation part 18 is a structure part that deforms under the internal pressure of the battery cell 10. The second deformation part 18 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharge, the internal pressure increases, and when the internal pressure reaches a certain level, such as a second threshold value, the second deformation part 18 deforms to contact the second electrode terminal 16, thereby connecting the first wall 110 and the second electrode terminal 16, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0224] In some embodiments, the part of the second deformation part 18 that deforms to contact the second electrode terminal 16 can be the part of the second electrode terminal 16 that is on the inner side of the first wall 110, or the part of the second electrode terminal 16 that is on the outer side of the first wall 110. For example, the second deformation part 18 can deform to connect the fourth part 161 when the internal pressure of the battery cell 10 reaches the second threshold value. For another example, the second deformation part 18 can deform to connect the third part 160 when the internal pressure of the battery cell 10 reaches the second threshold value.

[0225] In some embodiments, the second deformation member 18 can be a flip tab that flips under pressure. Exemplarily, referring to FIG. 5 and FIG. 13, the second deformation member 18 has a disc shape, and comprises, from outside to inside, a second skirt 180, a second flip tab 181, and a second electrical connection portion 182 connected in sequence. The second skirt 180 can be connected to the first wall 110. The second flip tab 181 is thin and is configured to deform and flip under pressure. After the second flip tab 181 flips, the second electrical connection portion 182 is pushed towards the second electrode terminal 16, so that the second electrical connection portion 182 contacts the second electrode terminal 16.

[0226] Exemplarily, the first wall 110 has a sixth through hole 1103, and the second skirt 180 is welded to the first wall 110, so that the second deformation member 18 closes the sixth through hole 1103. The second flip tab 181 is in a collapsed state in a direction away from the first wall 110 in a natural state. When the pressure inside the battery cell 10 reaches the second threshold value, the second flip tab 181 flips in a direction facing the first wall 110, so as to push the second electrical connection portion 182, so that the second electrical connection portion 182 passes through the sixth through hole 1103 and contacts the third portion 160.

[0227] In some embodiments, when the battery cell 10 is in an abuse condition such as overcharge, the pressure inside the battery cell 10 increases. When the pressure inside the battery cell 10 reaches a certain degree, for example, the first threshold value, the first deformation member 15 deforms to short the first electrode terminal 13 and the housing 11. When the pressure inside the battery cell 10 reaches the second threshold value, the second deformation member 18 deforms to short the second electrode terminal 16 and the housing 11, so that the positive and negative electrodes inside the battery cell 10 are shorted to cause internal short circuit. A 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 of overcharge protection. The melted electrical connection member can include the first adapter 123 and / or the second adapter 124. Exemplarily, the first adapter 123 has a first melting portion, and the overcurrent area of the first melting portion can be smaller than the overcurrent area of the rest of the first adapter 123, so that the first melting portion melts when a large current passes, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. Exemplarily, the second adapter 124 has a second melting portion, and the overcurrent area of the second melting portion can be smaller than the overcurrent area of the rest of the second adapter 124, so that the second melting portion melts when a large current passes, thereby breaking the current path of the second tab 121 and the second electrode terminal 16.

[0228] In the above scheme, on one hand, by arranging the second insulation part 17 between the first wall 110 and the second electrode terminal 16, the first wall 110 and the second electrode terminal 16 can be effectively insulated and isolated, and the risk of internal short circuit of the battery monomer 10 due to short circuit between the first wall 110 and the second electrode terminal 16 is reduced, so that the reliability of the battery is high; on the other hand, by arranging the second deformation part 18, when the internal pressure of the battery monomer 10 reaches a certain degree, for example, the second threshold value, the second deformation part 18 is deformed to contact the second electrode terminal 16, so that the second electrode terminal 16 is electrically connected with the second wall, cooperating with the short circuit of the first deformation part 15 and the first electrode terminal 13, so that the electrically connecting member in the battery monomer 10 is fused due to the large current generated by the short circuit, so as to cut off the charging and discharging circuit of the battery monomer 10, thereby playing a role of overcharge protection, and reducing the risk of thermal runaway of the battery monomer 10, thereby making the battery have high reliability; on the other hand, since the first electrode terminal 13 and the second electrode terminal 16 are both insulated and isolated from the first wall 110 under normal working conditions, the shell 11 of the battery monomer 10 can be uncharged, which is beneficial to the battery monomer 10 constituting an energy storage device, so that the risk of sparking breakdown between two adjacent battery monomers 10 in the energy storage device is small, and at the same time, by arranging the second deformation part 18, the overcharge protection function can be effectively realized, so that the energy storage device has high reliability.

[0229] According to some embodiments of the present application, the second electrode terminal 16 is a negative electrode terminal, so that the minimum pressure value for deforming the second deformation part 18 is greater than the minimum pressure value for deforming the first deformation part 15.

[0230] In some embodiments, the first deformation part 15 deforms when the internal pressure of the battery monomer 10 reaches a first threshold value. The second deformation part deforms when the internal pressure of the battery monomer 10 reaches a second threshold value. The second threshold value can be greater than the first threshold value.

[0231] In some embodiments, the second electrode terminal 16 is a negative electrode terminal, that is, the second electrode terminal 16 is electrically connected with the negative electrode lug of the electrode assembly 12.

[0232] The "second threshold value is greater than the first threshold value" can be understood as the second deformation part 18 is less likely to deform than the first deformation part 15, that is, when the internal pressure of the battery monomer 10 further increases and exceeds the first threshold value, the second deformation part 18 deforms.

[0233] In some embodiments, the manufacturing material or structure of the second deformation member 18 can be changed so that the second deformation member 18 is less deformable than the first deformation member 15. For example, in some embodiments, the second flip foil 181 of the second deformation member 18 has a greater thickness than the first flip foil 151 of the first deformation member 15, so that the second deformation member 18 deforms to contact the second electrode terminal 16 only when a greater pressure is applied. Alternatively, in some embodiments, a reinforcing structure, such as a reinforcing rib, a reinforcing concave-convex structure, or the like, is provided on the second flip foil 181, so that the second deformation member 18 deforms to contact the second electrode terminal 16 only when a greater pressure is applied.

[0234] In some embodiments, the "second threshold value is greater than the first threshold value" can be understood as the second deformation member 18 needs to be subjected to a greater pressure to contact the second electrode terminal 16 than the first deformation member 15, that is, when the internal pressure of the battery cell 10 further increases and exceeds the first threshold value, the second deformation member 18 contacts the second electrode terminal 16. For example, the distance between the second electrical connection portion 182 and the second electrode terminal 16 can be greater than the distance between the first electrical connection portion 152 and the first electrode terminal 13; for another example, in a natural state, the second flip foil 181 is farther away from the first wall 110 than the first flip foil 151.

[0235] In the above scheme, when the second electrode terminal 16 is a negative electrode terminal, by setting the second threshold value to be greater than the first threshold value, the second deformation member 18 deforms when the internal pressure of the battery cell 10 is greater than the first deformation member 15, on the one hand, the battery cell 10 has an overcharge protection function, on the other hand, it can reduce the risk of the second deformation member 18 being flipped by gas generated in the battery cell 10 under non-overcharge abuse conditions, causing the shell 11 to be negatively charged and corroded by the electrolyte, thereby ensuring the integrity of the shell 11 to some extent, reducing the risk of electrolyte leakage, and thus improving the reliability of the battery.

[0236] The risk of the second deformation member 18 being flipped over due to gas generation inside the battery monomer 10 under non-overcharge abuse conditions to cause the shell 11 to be negatively charged and corroded by the electrolyte can be understood as follows. As the number of charge and discharge cycles of the battery monomer 10 increases, the gas generation inside the battery monomer 10 also increases. At the end of the life of the battery monomer 10, the internal gas causes the internal pressure to be high. At this time, the battery is not in an overcharged state, but the internal pressure is too high, which can cause the second deformation member 18 to deform to connect the negative electrode tab of the electrode assembly 12 to the shell 11, so that the shell 11 is negatively charged. However, the negative charge of the shell 11 can cause an electrochemical reaction with the electrolyte, causing the shell 11 to be corroded, and there is a risk of liquid leakage. Therefore, by setting the second threshold value to be larger than the first threshold value, the probability of the shell 11 being negatively charged due to non-overcharge and the like can be reduced, thereby improving the integrity of the shell 11 and improving the reliability of the battery.

[0237] In some other embodiments, the relationship between the first threshold value and the second threshold value is not limited, for example, the first threshold value can be equal to the second threshold value.

[0238] According to some embodiments of the present application, please refer to FIG. 10, FIG. 12 and FIG. 14, FIG. 14 is a partial schematic view of the first wall 110 in some embodiments of the present application. The first wall 110 is formed with a fifth through hole 1102 and a sixth through hole 1103, the second electrode terminal 16 passes through the fifth through hole 1102, and the second deformation member 18 closes the sixth through hole 1103 along the thickness direction z of the first wall. The second deformation member 18 is configured to be deformable to partially pass through the sixth through hole 1103 to contact the second electrode terminal 16.

[0239] In some embodiments, the first wall 110 can be an end cover of the shell 11, and the first wall 110 can be in the form of a plate. Along the thickness direction z of the first wall 110, the first wall 110 is formed with a fifth through hole 1102 and a sixth through hole 1103. The fifth through hole 1102 is for the second electrode terminal 16 to pass through, and the sixth through hole 1103 is for the second deformation member 18 to pass through.

[0240] Exemplarily, referring to FIG. 12, the second electrode terminal 16 includes a third portion 160 and a fourth portion 161. The third portion 160 is located outside the first wall 110 and can be in a flat plate shape to be electrically connected with an external structure. The fourth portion 161 is located inside the first wall 110 to be electrically connected with the electrode assembly 12, and another part of the fourth portion 161 is connected with the third portion 160 through the fifth through hole 1102. The connection relationship between the fourth portion 161 and the third portion 160 includes but is not limited to welding, bonding, riveting, or threaded connection, etc. In other embodiments, the third portion 160 can be partially located outside the first wall 110, and another part of the third portion 160 can be connected with the fourth portion 161 through the fifth through hole 1102. In other embodiments, the third portion 160 can be partially located outside the first wall 110, and the fourth portion 161 can be partially located inside the first wall 110. Another part of the third portion 160 and another part of the fourth portion 161 are located in the fifth through hole 1102 and connected with each other.

[0241] The “second deformation piece 18 seals the sixth through hole 1103” can mean that the second deformation piece 18 seals the sixth through hole 1103, so that the electrode assembly 12 and the electrolyte are in a sealed space. In some embodiments, the second skirt 180 of the second deformation piece 18 is arranged around the edge of the sixth through hole 1103 and is welded to the inner side of the first wall 110.

[0242] In some embodiments, when the internal pressure of the battery monomer 10 reaches a certain degree, for example, the second threshold, the second deformation piece 18 can be deformed towards the third portion 160 to contact the third portion 160 through the sixth through hole 1103.

[0243] In some embodiments, the sixth through hole 1103 can be a stepped hole, which can provide a connection position for the second skirt 180 of the second deformation piece 18, so that the second skirt 180 can be accommodated in the sixth through hole 1103, reducing the occupation of the internal space of the battery monomer 10 by the second deformation piece 18.

[0244] In the above scheme, when the internal pressure of the battery monomer 10 reaches a certain degree, for example, the second threshold, the internal pressure of the battery monomer 10 can act on the second deformation piece 18, so that the second deformation piece 18 is deformed towards the outside of the first wall 110 to effectively contact the third portion 160 of the second electrode terminal 16, cooperating with the contact between the first deformation piece 15 and the first electrode terminal 13, so that the electrical connection member inside the battery monomer 10 is fused due to the large current generated by the short circuit, to cut off the charging and discharging circuit of the battery monomer 10, thereby reducing the risk of thermal runaway of the battery monomer 10, and thus making the battery have higher reliability.

[0245] According to some embodiments of the present application, referring to FIG. 12, along the thickness direction z of the first wall, the projection of the third portion 160 on the outer side of the first wall 110 at least partially overlaps the projection of the second deformation member 18.

[0246] In some embodiments, the third portion 160 is large in size, and along the thickness direction z of the first wall, a part of the third portion 160 can be arranged opposite the fourth portion 161 to be connected with the fourth portion 161, and a part of the third portion 160 can be arranged opposite the second deformation member 18 to be in direct contact with the second deformation member 18 when the second deformation member 18 is deformed.

[0247] In some embodiments, along the thickness direction z of the first wall, the projection of the second deformation member 18 can entirely fall on the third portion 160. In other embodiments, along the thickness direction z of the first wall, the projection of the second deformation member 18 can partially fall on the third portion 160, and the other part is offset from the third portion 160.

[0248] In the above scheme, by arranging the second deformation member 18 along the thickness direction z of the first wall to correspond to the third portion 160, the third portion 160 can be quickly contacted with a small deformation amount when the internal pressure of the battery monomer 10 reaches a certain degree, for example, the second threshold value, so as to quickly make the second electrode terminal 16 and the first wall 110 electrically connected, cooperate with the first deformation member 15 to contact the first electrode terminal 13, and make the electrically connected member in the battery monomer 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 monomer 10, thereby reducing the risk of thermal runaway of the battery monomer 10, and further improving the reliability of the battery.

[0249] According to some embodiments of the present application, referring to FIG. 10, the first wall 110 includes a body portion 110a and a second reinforcing portion 110c connected with each other, and the third portion 160 on the outer side of the first wall 110 where the second electrode terminal 16 is located is arranged on the second reinforcing portion 110c.

[0250] In some embodiments, the second reinforcing portion 110c is used to strengthen the overall structural strength of the first wall 110 or to strengthen the local structural strength of the first wall 110, so that the first wall 110 has a higher impact resistance and reduces the risk of deformation of the first wall 110. In some embodiments, the second reinforcing portion 110c can be a reinforcing rib, a concave-convex structure, or the like.

[0251] In some embodiments, the first wall 110 includes a body portion 110a and a second reinforcing portion 110c arranged on the surface of the body portion 110a in a stacked manner, the material of the second reinforcing portion 110c is the same as that of the body portion 110a, and the thickness of the first wall 110 at the position of the second reinforcing portion 110c is larger, so that the position has a larger structural strength.

[0252] In some embodiments, the first wall 110 comprises a body portion 110a, the body portion 110a is stamped to form a convex portion on one side of the body portion 110a and a concave portion on the other side of the body portion 110a, and the convex portion and the concave portion form a second reinforcing portion 110c.

[0253] In some other embodiments, the first wall 110 comprises a body portion 110a and a second reinforcing portion 110c, the body portion 110a is arranged around the edge of the second reinforcing portion 110c, and the material of the second reinforcing portion 110c can be the same as or different from the material of the body portion 110a, and the structural strength of the second reinforcing portion 110c is greater than that of the body portion 110a.

[0254] The "the third portion 160 is arranged on the second reinforcing portion 110c" can be understood as that the part of the first wall 110 for supporting the third portion 160 is the part with greater structural strength of the first wall 110.

[0255] In the above scheme, by arranging the second reinforcing portion 110c, the overall strength of the first wall 110 can be improved, the risk that the first wall 110 is deformed due to the internal pressure of the battery monomer 10 or external impact, so that the second deformation piece 18 cannot effectively contact the third portion 160 to conduct the second electrode terminal 16 and the first wall 110 can be reduced, the second deformation piece 18 can effectively contact the second electrode terminal 16 under the abuse working condition such as overcharge of the battery monomer 10, thereby effectively playing the role of overcharge protection, reducing the risk of thermal runaway of the battery monomer 10, and making the battery have higher reliability.

[0256] In some embodiments, the second reinforcing portion 110c is less likely to be deformed than the body portion 110a, so as to effectively support the third portion 160.

[0257] In some embodiments, the body portion 110a can be arranged around the edge of the second reinforcing portion 110c.

[0258] In some embodiments, the second reinforcing portion 110c can be convex-concave relative to the body portion 110a, so that the structural strength of the second reinforcing portion 110c is greater than that of the body portion 110a. In some other embodiments, the thickness of the second reinforcing portion 110c can be greater than that of the body portion 110a, so that the structural strength of the second reinforcing portion 110c is greater than that of the body portion 110a. By arranging the structural strength of the second reinforcing portion 110c to be greater than that of the body portion 110a, on the one hand, the overall strength of the first wall 110 can be effectively improved, and on the other hand, the local part of the first wall 110 corresponding to the third portion 160 can have stronger structural strength, so that the third portion 160 effectively cooperates with the second deformation piece 18, and the reliability of overcharge protection is improved.

[0259] According to some embodiments of the present application, referring to FIG. 10 and FIG. 14, the second reinforcing portion 110c includes a second protruding portion 110c0 protruding from one surface of the body portion 110a along the thickness direction z of the first wall.

[0260] In some embodiments, the second reinforcing portion 110c includes a second protruding portion 110c0 protruding from a surface of the first wall 110. Illustratively, the second protruding portion 110c0 protrudes from the outer side surface of the first wall 110; or the first protruding portion 110b0 protrudes from the inner side surface of the first wall 110.

[0261] In some embodiments, the first wall 110 can include a body portion 110a, and the body portion 110a can be defined with a second reinforcing region, and the second protruding portion 110c0 can be arranged in the second reinforcing region, and the second reinforcing region can be regarded as the second reinforcing portion 110c. The third portion 160 can be arranged in the second reinforcing region, for example, the third portion 160 is arranged on the surface of the second protruding portion 110c0 away from the body portion 110a, and for another example, the third portion 160 can be arranged on the portion of the body portion 110a away from the second protruding portion 110c0. In some embodiments, the second protruding portion 110c0 and the body portion 110a can be a split structure, for example, the second protruding portion 110c0 is arranged in a stacked manner on the body portion 110a, and the connection relationship between the second protruding portion 110c0 and the body portion 110a includes but is not limited to bonding, welding, riveting, or threaded connection, etc. In some embodiments, the second protruding portion 110c0 and the body portion 110a can be an integral structure, which is integrally formed by stamping, casting or other processes.

[0262] In the above scheme, by arranging the second protruding portion 110c0 to strengthen the structural strength of the first wall 110, the risk that the first wall 110 is deformed due to the internal pressure of the battery monomer 10 or external impact, so that the second deforming member 18 cannot effectively contact the third portion 160 to conduct the second electrode terminal 16 and the first wall 110, can be effectively reduced, so that the battery has higher reliability.

[0263] According to some embodiments of the present application, the second reinforcing portion 110c further includes a second recessed portion 110c1 arranged on the other surface of the body portion 110a along the thickness direction z of the first wall, and the second recessed portion 110c1 is arranged opposite to the second protruding portion 110c0.

[0264] The second recess 110c1 is a portion corresponding to the second protrusion 110c0. Exemplarily, when the second protrusion 110c0 is located at the outer side of the first wall 110, the second recess 110c1 is located at the inner side of the first wall 110; conversely, when the second protrusion 110c0 is located at the inner side of the first wall 110, the second recess 110c1 is located at the outer side of the first wall 110.

[0265] In some embodiments, the first wall 110 can be formed with the second protrusion 110c0 and the second recess 110c1 by stamping. For example, along the thickness direction z of the first wall, a stamping head stamps the first wall 110 from the inner side to the outer side of the first wall 110 to form the second protrusion 110c0 at the outer side of the first wall 110 and the second recess 110c1 at the inner side of the first wall 110.

[0266] In some embodiments of the present application, the second recess 110c1 is located at the inner side of the first wall 110, and at least part of the second deformation member 18 and the fourth portion 161 are located in the second recess 110c1.

[0267] In the above scheme, the second recess 110c1 is arranged at a position corresponding to the second protrusion 110c0. On the one hand, this can reduce the difficulty of forming the second protrusion 110c0 and save material costs. On the other hand, if the second recess 110c1 is located at the inner side of the first wall 110, more active substances or electrolyte can be accommodated in the space of the second recess 110c1, which is conducive to improving the energy density or charge-discharge performance of the battery monomer 10. If the second recess 110c1 is located at the outer side of the first wall 110, external structural members can be accommodated in the space of the second recess 110c1, which is conducive to improving the volumetric energy density of the battery.

[0268] According to some embodiments of the present application, referring to FIGS. 12 and 14, the second protrusion 110c0 is located at the outer side of the first wall 110, and the second protrusion 110c0 is formed with a second positioning groove 110c2, and the second positioning groove 110c2 accommodates the third portion 160 to limit the movement of the third portion 160.

[0269] In some embodiments, the second protrusion 110c0 is located at the outer side of the first wall 110, and the third portion 160 can be arranged on the second protrusion 110c0.

[0270] The second positioning groove 110c2 is a groove structure formed on the second protruding portion 110c0, and the third portion 160 is located in the second positioning groove 110c2. For example, the second protruding portion 110c0 has a top surface facing away from the electrode assembly 12, and the second positioning groove 110c2 is a square groove formed on the top surface. The third portion 160 in the square shape and a portion of the second insulating portion 17 are located in the second positioning groove 110c2. The second insulating portion 17 is clamped by the groove wall of the second positioning groove 110c2 and the outer circumferential surface of the third portion 160.

[0271] In the above scheme, by arranging the second positioning groove 110c2, the second electrode terminal 16 can be effectively positioned, and the displacement of the second electrode terminal 16 is limited. On the one hand, the risk of the second electrode terminal 16 being separated from the internal electrical connection member of the battery monomer 10 to cause internal disconnection of the battery monomer 10 is reduced. On the other hand, the second electrode terminal 16 can be effectively matched with the second deformation member 18 to play a role of overcharge protection, thereby improving the reliability of the battery.

[0272] According to some embodiments of the present application, the second protruding portion 110c0 is located on the outer side of the first wall 110, and the size of the second protruding portion 110c0 protruding from the body portion 110a in the thickness direction z of the first wall is greater than or equal to 0.1 mm and less than or equal to 5 mm.

[0273] In some embodiments, referring to FIG. 14, the size of the second protruding portion 110c0 protruding from the body portion 110a in the thickness direction z of the first wall is L2, and the value of L2 is greater than or equal to 0.1 mm and less than or equal to 5 mm. For example, the value of L2 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, or any value between any two adjacent values.

[0274] In the above scheme, by arranging the size of the second protruding portion 110c0 protruding from the body portion 110a to be greater than or equal to 0.1 mm, the structural strength of the first wall 110 can be effectively improved. When the internal pressure of the battery monomer 10 reaches the second threshold value, the second deformation member 18 can effectively contact the second electrode terminal 16 to play a role of overcharge protection, thereby improving the reliability of the battery. By arranging the size of the second protruding portion 110c0 protruding from the body portion 110a to be less than or equal to 5 mm, the second protruding portion 110c0 can occupy less space, thereby reducing the impact on the volume energy density of the battery. Therefore, by arranging the size of the second protruding portion 110c0 protruding from the body portion 110a to be greater than or equal to 0.1 mm and less than or equal to 5 mm, the reliability of the overcharge protection of the battery monomer 10 and the volume energy density of the battery can be considered.

[0275] According to some embodiments of the present application, the size of the second protrusion 110c0 protruding from the body portion 110a along the thickness direction z of the first wall is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0276] In some embodiments, the size of the second protrusion 110c0 protruding from the body portion 110a along the thickness direction z of the first wall is L2, and L2 is greater than or equal to 0.5 mm and less than or equal to 3 mm. For example, L2 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, or any value between adjacent two values.

[0277] In the above scheme, by setting the size of the second protrusion 110c0 protruding from the body portion 110a to be greater than or equal to 0.5 mm, the structural strength of the first wall 110 is further improved, so that the second deformation piece 18 efficiently contacts the second electrode terminal 16 when the internal pressure of the battery monomer 10 reaches the second threshold value, thereby playing a role of overcharge protection, and further improving the reliability of the battery; by setting the size of the second protrusion 110c0 protruding from the body portion 110a to be less than or equal to 3 mm, the occupation of space by the second protrusion 110c0 can be effectively reduced, and the influence on the volume energy density of the battery can be reduced. Therefore, by setting the size of the second protrusion 110c0 protruding from the body portion 110a to be greater than or equal to 0.5 mm and less than or equal to 3 mm, the reliability of the overcharge protection of the battery monomer 10 and the volume energy density of the battery can be considered.

[0278] According to some embodiments of the present application, referring to FIGS. 5, 7, and 11, the second insulation portion 17 includes a second insulation piece 170, at least a portion of the second insulation piece 170 is arranged between the third portion 160 and the first wall 110, the second insulation piece 170 is formed with a seventh through hole 17001 and an eighth through hole 17002, along the thickness direction z of the first wall, the seventh through hole 17001 is arranged opposite to the fifth through hole 1102, and the eighth through hole 17002 is arranged opposite to the sixth through hole 1103.

[0279] In some embodiments, referring to FIG. 5, the second insulation piece 170 can be regarded as a plate-shaped structure arranged between the third portion 160 and the first wall 110 to insulate and separate the third portion 160 and the first wall 110. The second insulation piece 170 has a seventh through hole 17001 and an eighth through hole 17002 penetrating along the thickness direction z of the first wall, the seventh through hole 17001 is arranged corresponding to the fifth through hole 1102 for the second electrode terminal 16 to pass through, and the eighth through hole 17002 is arranged corresponding to the sixth through hole 1103 for the second deformation piece 18 to pass through after deformation to contact the third portion 160.

[0280] In some embodiments, the seventh through hole 17001 can be a square hole, a circular hole, or other shapes. The eighth through hole 17002 can be a square hole, a circular hole, or other shapes.

[0281] In some embodiments, the seventh through hole 17001 and the fifth through hole 1102 can be circular holes, and the aperture of the seventh through hole 17001 can be less than or equal to the aperture of the fifth through hole 1102. In some embodiments, the eighth through hole 17002 and the sixth through hole 1103 can be circular holes, and the aperture of the eighth through hole 17002 can be less than or equal to the aperture of the sixth through hole 1103.

[0282] Exemplarily, in some embodiments of the present application, the material of the second insulating member 170 can include an insulating PPS (polyphenylene sulfide) material. In other embodiments, the second insulating member 170 can also be made of polypropylene, polyethylene, or other materials with insulating properties. Exemplarily, in some embodiments of the battery monomer 10 provided by the present application, the resistance value of the second insulating member 170 can be greater than or equal to 200 MΩ.

[0283] In the above scheme, the second insulating member 170 has a simple structure. On the one hand, the second electrode terminal 16 passes through the seventh through hole 17001, so that the second electrode terminal 16 is electrically connected to the electrode assembly 12 and realizes external charging and discharging, and the second deformation member 18 deforms through the eighth through hole 17002 to be able to contact the third part 160, realizing overcharge protection. On the other hand, the second insulating member 170 can effectively insulate and isolate the third part 160 and the first wall 110, reduce the risk of internal short circuit of the battery monomer 10 caused by short circuit of the third part 160 and the first wall 110, and make the battery have high reliability.

[0284] According to some embodiments of the present application, referring to FIG. 12, the second insulating member 170 includes a second body 1700 and a third flange 1701, the second body 1700 is located between the third part 160 and the first wall 110, and the third flange 1701 is arranged on the surface of the second body 1700 away from the first wall 110, and the third flange 1701 surrounds at least part of the outer circumferential surface of the third part 160.

[0285] In some embodiments, the second body 1700 is clamped between the third part 160 and the first wall 110, and the second body 1700 is in the form of a flat plate as a whole. The third flange 1701 is protruded from the surface of the second body and surrounds the outer circumferential surface of the third part 160.

[0286] The “third flange 1701 surrounds at least part of the outer circumferential surface of the third part 160” can be understood as that the third flange 1701 can completely cover the outer circumferential surface of the third part 160 or the third flange 1701 can partially cover the outer circumferential surface of the third part 160.

[0287] In some embodiments, referring to FIG. 12, the second insulation member 170 wraps the third portion 160 and is in the second positioning groove 110c2, and the third flange 1701 is between the outer circumferential surface of the third portion 160 and the groove wall of the second positioning groove.

[0288] In the above scheme, by arranging the second body 1700 and the third flange 1701, the first wall 110 and the third portion 160 can be effectively insulated and isolated, so that the third portion 160 has a farther creepage distance from the first wall 110, so that the second insulation member 170 has higher insulation performance, effectively reducing the risk of internal short circuit of the battery monomer 10 caused by short circuit between the first wall 110 and the second electrode terminal 16, so that the reliability of the battery is high.

[0289] According to some embodiments of the present application, referring to FIG. 12, the second insulation member 170 further comprises a fourth flange 1702, the fourth flange 1702 is arranged around the seventh through hole 17001 and is located between the hole wall of the fifth through hole 1102 and the second electrode terminal 16.

[0290] The fourth flange 1702 is a part of the structure of the second insulation member 170, the fourth flange 1702 is connected with the second body 1700 and is arranged around the seventh through hole 17001, along the thickness direction z of the first wall, the fourth flange 1702 protrudes towards the fifth through hole 1102 to cover part of the hole wall of the fifth through hole 1102, thereby insulating and isolating the second electrode terminal 16 from the hole wall of the fifth through hole 1102. In some embodiments, the fourth flange 1702 also has the function of positioning, through the mutual positioning of the fourth flange 1702 and the fifth through hole 1102, the second insulation member 170 is quickly assembled on the first wall 110.

[0291] In some embodiments, the fourth flange 1702 can partially or completely cover the hole wall of the fifth through hole 1102.

[0292] In the above scheme, by arranging the fourth flange 1702, the hole wall of the fifth through hole 1102 and the second electrode terminal 16 can be effectively insulated and isolated, reducing the risk of internal short circuit of the battery monomer 10 caused by contact between the second electrode terminal 16 and the hole wall of the fifth through hole 1102, effectively improving the reliability of the battery.

[0293] In some embodiments, referring to FIG. 5 and FIG. 12, the second insulation portion 17 can further comprise a second sealing portion 171, the second sealing portion 171 can be sleeved on the fourth portion 161, part of the second sealing portion 171 is clamped between the fifth through hole 1102 and the fourth portion 161, and another part of the second sealing portion 171 can be clamped between the surface of the first wall 110 away from the third portion 160 and the fourth portion 161.

[0294] According to some embodiments of the present application, the resistance value of the second insulation part 17 is greater than or equal to 200 megaohms.

[0295] In some embodiments, a second insulation part 17 with a resistance value greater than or equal to 200 megaohms can be arranged between the first wall 110 and the second electrode terminal 16. That is, in some embodiments, the resistance value of the second insulation part 17 can be 200 megaohms, 210 megaohms, 220 megaohms, or greater.

[0296] In some embodiments, the resistance value of the second insulation part 17 can be measured by a multimeter test method, a bridge measurement method, a voltammetry method, an ohmmeter method, or the like. In some embodiments, the resistance value of the second insulation part 17 can be measured by a megaohmmeter.

[0297] In the above scheme, by setting the resistance value of the second insulation part 17 to be greater than or equal to 200 megaohms, the insulation withstand voltage between the second electrode terminal 16 and the first wall 110 can be effectively improved, the insulation withstand voltage requirement of the energy storage device can be effectively adapted, the risk of the external voltage breaking through the second insulation part 17 to conduct the first wall 110 and the second electrode terminal 16, and causing internal short circuit of the battery monomer 10 can be reduced, and the energy storage device has higher reliability.

[0298] According to some embodiments of the present application, the resistance value of the first insulation part 14 is greater than or equal to 200 megaohms.

[0299] In some embodiments, a first insulation part 14 with a resistance value greater than or equal to 200 megaohms can be arranged between the first wall 110 and the first electrode terminal 13. That is, in some embodiments, the resistance value of the first insulation part 14 can be 200 megaohms, 210 megaohms, 220 megaohms, or greater.

[0300] In some embodiments, the resistance value of the first insulation part 14 can be measured by a multimeter test method, a bridge measurement method, a voltammetry method, an ohmmeter method, or the like. In some embodiments, the resistance value of the second insulation part 14 can be measured by a megaohmmeter.

[0301] In the above scheme, by setting the resistance value of the first insulation part 14 to be greater than or equal to 200 megaohms, the insulation withstand voltage between the first electrode terminal 13 and the first wall 110 can be effectively improved, the insulation withstand voltage requirement of the energy storage device can be effectively adapted, the risk of the external voltage breaking through the first insulation part 14 to conduct the first wall 110 and the first electrode terminal 13, and causing internal short circuit of the battery monomer 10 can be reduced, and the energy storage device has higher reliability.

[0302] According to some embodiments of the present application, referring to FIG. 4 and FIG. 15, FIG. 15 is a schematic view of the shell 111 and the electrode assembly 12 in some embodiments of the present application. The shell 11 includes the shell 111 and an end cover, and the shell 111 has an opening. The first wall 110 is the end cover, which is connected with the shell 111 and seals the opening.

[0303] In some embodiments, the shell 11 includes the shell 111 and an end cover. The shell 111 has an accommodating cavity formed inside for accommodating the electrode assembly 12, and the shell 111 has an opening communicating with the accommodating cavity, and the end cover is attached to the opening of the shell 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cover can be connected with the shell 111 by welding, bonding, clamping or other connection methods. Optionally, the shell 11 can further include a bottom plate, and the shell 111 has two openings at two ends respectively, one of which is sealed by the end cover and the other of which is sealed by the bottom plate.

[0304] 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, steel or aluminum alloy; for another example, part of the shell 11 can be made of metal and the rest can be made of non-metal, for example, the end cover of the shell 11 can be made of metal and the shell 111 or other parts of the shell 11 can be made of non-metallic material.

[0305] In some embodiments of the present application, the shell 111 can be an aluminum shell.

[0306] In some embodiments, the end cover, the first electrode terminal 13, the second electrode terminal 16, the first insulating part 14, the second insulating part 17 and other structures can be assembled into an end cover assembly first, and then the end cover assembly is assembled into the shell 111.

[0307] In the above scheme, the shell 11 has a simple structure, is convenient for assembling the battery monomer 10, and is conducive to improving the efficiency of battery manufacturing.

[0308] According to some embodiments of the present application, referring to FIG. 15 and FIG. 16, FIG. 16 is a schematic view of the shell 111 and the first insulating layer 19 in some embodiments of the present application.

[0309] The inner wall of the shell 111 is provided with the first insulating layer 19.

[0310] The first insulation layer 19 is arranged on the inner wall of the shell 111 and can insulate and protect the inner wall of the shell 111. In some embodiments, at the end of the life of the battery cell 10, due to the gas generated by the charging and discharging cycle inside the battery cell 10, there is a false triggering event of the first deformation member 15 or the second deformation member 18. If the shell 11 is negatively charged due to the deformation of the first deformation member 15 or the second deformation member, the shell 11 will be subjected to an electrochemical corrosion reaction, and the lithium of the negative electrode will be embedded into the shell 11. After the shell 11 is embedded with lithium, the volume expands to form a porous structure, and eventually causes corrosion and leakage, which further triggers insulation and even causes more serious problems. Therefore, the first insulation layer 19 arranged on the inner wall of the shell 111 can cut off the ion path between the shell 11 and the negative electrode, thereby cutting off the electrochemical corrosion reaction.

[0311] In some embodiments, during the assembly of the electrode assembly 12 in the shell 111, metal particles may, due to the manufacturing process, pierce the separator of the electrode assembly 12, causing the metal particles to conduct between the shell 111 and the negative electrode. Therefore, the first insulation layer 19 arranged on the inner wall of the shell 111 can play a protective role and improve the problem of metal particles conducting between the shell 111 and the negative electrode.

[0312] In some embodiments, the inner wall of the shell 111 includes the inner surface of the side wall of the shell 111 and the inner surface of the bottom wall of the shell 111.

[0313] In some embodiments, the first insulation layer 19 is a layered structure arranged on the inner wall of the shell 111 and has insulation properties. For example, the first insulation layer 19 can be a coating or a plate-shaped, layered, or other thin structure arranged on the inner wall of the shell 111.

[0314] In the above scheme, by arranging the first insulation layer 19 inside the shell 111, the electrolyte inside the shell 111 can be effectively insulated and isolated from the inner wall of the shell 111, thereby reducing the risk of corrosion of the shell 111 by the electrolyte and reducing the risk of electrolyte leakage, so that the battery has higher reliability.

[0315] According to some embodiments of the present application, the first insulation layer 19 is an insulation coating arranged on the inner wall of the shell 111.

[0316] In some embodiments, the material of the insulation coating can include epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The first insulation layer 19 can be coated on the inner wall of the shell 111 by dipping, spraying, electroplating, anodizing, or other processes.

[0317] In the above scheme, by arranging the insulating coating on the inner wall of the shell 111, on the one hand, the electrolyte can be effectively separated from the shell 111, and the ion path between the motor assembly and the shell 111 is cut off, thereby reducing the risk of corrosion of the shell 111; on the other hand, the first insulating layer 19 can be efficiently formed on the inner wall of the shell 111 by spraying or other methods, thereby improving the manufacturing efficiency of the battery; in addition, the insulating coating has high mechanical strength, which can effectively reduce the risk of puncture by metal particles introduced during the manufacturing process, thereby reducing the risk of internal short circuit of the battery monomer 10 or the risk of corrosion of the shell 111, and improving the reliability of the battery.

[0318] According to some embodiments of the present application, referring to FIG. 16, along the first direction y, the inner wall of the shell 111 includes a blank area 19b and an insulating area connected in sequence, the insulating area is provided with the first insulating layer 19, and the blank area 19b is connected with the first wall 110, and the first direction y is parallel to the direction in which the first wall 110 points to the electrode assembly 12.

[0319] In some embodiments, the first direction y can be parallel to the direction in which the first wall 110 points to the electrode assembly 12, and the first direction y can be the thickness direction z of the first wall.

[0320] In some embodiments, along the first direction y, the inner wall of the shell 111 includes a blank area 19b and an insulating area connected in sequence, the blank area 19b can not be provided with the first insulating layer 19, and the blank area 19b can be connected with the first wall 110, for example, the blank area 19b is welded with the outer peripheral surface of the first wall 110. Along the first direction y, the insulating area is located below the first wall 110, and the insulating area is provided with the first insulating layer 19. For example, the shell 111 includes a side wall and a bottom wall, the first wall 110 is an end cover, the blank area 19b is formed at the top of the inner surface of the side wall, and the insulating area is formed at the remaining position of the inner surface of the side wall and the inner surface of the bottom wall.

[0321] In some embodiments, the size of the blank area 19b in the first direction y can be greater than or equal to 5 mm, that is, it can be understood that the blank area 19b can provide an area with a size greater than or equal to 5 mm in the first direction y for the end cover to be welded with the shell 111.

[0322] In some embodiments, the forming method of the blank area 19b can include arranging a non-coating area in advance by pasting glue before preparing the insulating coating, or cleaning out the blank area 19b by a laser cleaning process.

[0323] In the above scheme, by arranging the blank area 19b, the influence of the first insulating layer 19 on the mutual connection part of the shell 111 and the first wall 110 can be reduced. For example, the first wall 110 and the shell 111 are mutually welded, and by arranging the blank area 19b, the welding quality between the first wall 110 and the shell 111 can be good, thereby improving the quality of the battery.

[0324] According to some embodiments of the present application, along the second direction x, the projection of the electrode assembly 12 on the inner wall of the shell 111 does not coincide with the blank area 19b, and the second direction x is perpendicular to the first direction y.

[0325] The second direction x is perpendicular to the first direction y. In some embodiments, the first direction y is regarded as the height direction, and the second direction x can be the horizontal direction. The "along the second direction x, the projection of the electrode assembly 12 on the inner wall of the shell 111 does not coincide with the blank area 19b" can be understood as that the blank area 19b is located on the side of the electrode assembly 12 close to the end cover.

[0326] In the above scheme, by arranging the electrode assembly 12 and the blank area 19b in a staggered manner, the risk of internal short circuit of the battery monomer 10 caused by the overlap of the electrode assembly 12 and the blank area 19b or the corrosion of the shell 11 due to negative electricity can be reduced, thereby effectively improving the reliability of the battery monomer 10 and the battery.

[0327] According to some embodiments of the present application, the thickness of the first insulating layer 19 is greater than or equal to 60 μm and less than or equal to 200 μm.

[0328] Referring to FIG. 16, the thickness of the first insulating layer 19 is M, and the value of M can be greater than or equal to 60 μm and less than or equal to 200 μm. For example, the value of M can be 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 180 μm, 190 μm, 200 μm or any value between two adjacent values.

[0329] In the above scheme, by setting the thickness of the first insulating layer 19 to be greater than or equal to 60 μm, the first insulating layer 19 can have high mechanical strength and insulation performance, effectively isolate the shell 111 and the electrolyte, reduce the risk of corrosion of the shell 111 due to negative electricity, and improve the reliability of the battery. By setting the thickness of the first insulating layer 19 to be less than or equal to 200 μm, the occupation of the internal space of the battery monomer 10 by the first insulating layer 19 can be effectively reduced, thereby improving the volume energy density of the battery monomer 10 and the battery. Therefore, by setting the thickness of the first insulating layer 19 to be greater than or equal to 60 μm and less than or equal to 200 μm, the reliability and volume energy density of the battery can be considered.

[0330] According to some embodiments of the present application, the thickness of the first insulating layer 19 is greater than or equal to 80 μm and less than or equal to 130 μm.

[0331] The thickness of the first insulating layer 19 is M, which can be greater than or equal to 80 μm and less than or equal to 130 μm. For example, M can be 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm or any value between two adjacent values.

[0332] In the above scheme, by setting the thickness of the first insulating layer 19 to be greater than or equal to 80 μm, the first insulating layer 19 can have higher mechanical strength and insulation performance, effectively isolating the shell 111 and the electrolyte, reducing the risk of corrosion of the shell 111 due to negative electricity, and making the battery have higher reliability. By setting the thickness of the first insulating layer 19 to be less than or equal to 130 μm, the first insulating layer 19 can further reduce the occupation of the internal space of the battery monomer 10, so that the battery monomer 10 has higher volumetric energy density, so that the battery has higher volumetric energy density. Therefore, by setting the thickness of the first insulating layer 19 to be greater than or equal to 80 μm and less than or equal to 130 μm, the reliability and volumetric energy density of the battery can be effectively considered.

[0333] According to some embodiments of the present application, please refer to FIG. 17, which is a schematic view of the shell 111 and the first insulating layer 19 in some embodiments of the present application. The outer surface of the shell 111 is provided with a second insulating layer 19a.

[0334] In some embodiments, the outer surface of the shell 111 is the surface of the shell 111 that contacts the outside world, for example, the outer surface of the shell 111 includes the outer surface of the side wall of the shell 111 and the outer surface of the bottom wall of the shell 111.

[0335] In some embodiments, the second insulating layer 19a is a layered structure provided on the outer surface of the shell 111, which has insulation performance. For example, the second insulating layer 19a can be a coating or a plate-like, layered structure with a relatively thin thickness provided on the outer surface of the shell 111.

[0336] For example, the second insulating layer 19a can be an insulating coating, and the material of the insulating coating can include epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The second insulating layer 19a can be coated on the outer surface of the shell 111 by dipping, spraying, electroplating, anodizing, etc.

[0337] In the above scheme, by arranging the second insulating layer 19a on the outer surface of the shell 111, the shell 111 can be effectively insulated and protected, the risk of corrosion caused by the negative charge of the shell 111 can be reduced, and the battery has higher reliability.

[0338] According to some embodiments of the present application, a battery is also provided, which has the battery cell 10 described above. Referring to FIG. 3, the battery 100 includes the battery cell 10 and a box 20, and the battery cell 10 is accommodated in the box 20. The box 20 is used to provide an accommodation space for the battery cell 10, and the box 20 can have various structures.

[0339] In the battery 100, the battery cell 10 can be one or multiple, and each battery cell 10 can be fixed to the box 20 by a connecting member (such as a bolt), or each battery cell 10 can be fixed to the box 20 by an adhesive.

[0340] According to some embodiments of the present application, an energy storage device is also provided, which includes the battery cell 10 described above.

[0341] In some embodiments, the battery cell 10 is first formed into a battery, and one or more batteries are applied to an energy storage device. Referring to FIG. 2, the energy storage device 2000 can include a cabinet 2001 and multiple batteries 100. The multiple batteries 100 can be arranged in the cabinet 2001. The multiple batteries 100 can be connected in series, in parallel, or in a hybrid manner.

[0342] According to some embodiments of the present application, a power consumption device is also provided, which includes the battery cell 10 described above. In some embodiments, the battery cell 10 is first formed into a battery 100, and one or more batteries 100 are applied to the power consumption device.

[0343] In some embodiments, referring to FIG. 1, the power consumption device is a vehicle 1000. The vehicle 1000 can include a controller 200, a motor 300, and a battery 100, and the controller 200 is used to control the battery 100 to supply power to the motor 300.

[0344] According to some embodiments of the present application, a battery cell 10 is provided, referring to FIGS. 4-17.

[0345] The battery cell 10 includes a shell 11, an electrode assembly 12, a first electrode terminal 13, a first insulating portion 14, a first deformation member 15, a second electrode terminal 16, a second insulating portion 17, and a second deformation member 18.

[0346] The housing 11 includes a casing 111 and an end cover. The casing 111 has an accommodation cavity formed inside for accommodating the electrode assembly 12, and has an opening communicating with the accommodation cavity, and the end cover closes the opening of the casing 111, so that the electrode assembly 12 is in a closed space.

[0347] The end cover includes a body portion 110a, a first reinforcing portion 110b and a second reinforcing portion 110c. The first reinforcing portion 110b includes a first protrusion 110b0 located outside the body portion 110a and a first recess 110b1 located inside the body portion 110a, and the first protrusion 110b0 and the first recess 110b1 are oppositely arranged in the thickness direction of the end cover. The second reinforcing portion 110c includes a second protrusion 110c0 located outside the body portion 110a and a second recess 110c1 located inside the body portion 110a. The first protrusion 110b0 is formed with a first positioning groove 110b2, and the second protrusion 110c0 is formed with a second positioning groove 110c2. The first positioning groove 110b2 is formed with a first through hole 1100 and a second through hole 1101, and the second positioning groove 110c2 is formed with a fifth through hole 1102 and a sixth through hole 1103.

[0348] In some embodiments, the protruding height of the first protrusion 110b0 can be greater than or equal to 0.5 mm and less than or equal to 3 mm. In some embodiments, the protruding height of the second protrusion 110c0 can be greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0349] The first electrode terminal 13 is installed in the first through hole 1100, and in the thickness direction of the end cover, the first electrode terminal 13 includes a first portion 130 located outside the end cover and a second portion 131 at least partially located inside the end cover, the first portion 130 is used for electrical connection with an external component, and the second portion 131 is electrically connected to the first tab 120 of the electrode assembly 12 through the first adapter 123. The first insulating portion 14 includes a first insulating piece 140, and in some embodiments, the electrical resistance of the first insulating piece 140 is at least 200 megaohms or more. The first insulating piece 140 includes a first body 1400, a first flange 1401 and a second flange 1402. The first body 1400 is located between the first portion 130 and the end cover, and the first body 1400 is formed with a third through hole 14001 and a fourth through hole 14002, the third through hole 14001 corresponds to the first through hole 1100 for the first electrode terminal 13 to pass through, and the fourth through hole 14002 is arranged corresponding to the second through hole 1101. The first flange 1401 is arranged on the surface of the first body 1400 away from the end cover, and the first flange 1401 surrounds a part of the outer peripheral surface of the first portion 130. The second flange 1402 is arranged around the third through hole 14001 and is located between the hole wall of the first through hole 1100 and the first electrode terminal 13.

[0350] The first deformation member 15 is welded to the inner side of the end cover and closes the second through hole 1101. The first deformation member 15 can be a flip tab. The first deformation member 15 is configured to be deformed to partially pass through the second through hole 1101 to contact the first portion 130. For example, the first deformation member 15 is configured to be deformed to partially pass through the second through hole 1101 to contact the first portion 130 when the internal pressure of the battery cell 10 reaches a first threshold value.

[0351] The second electrode terminal 16 is mounted to the fifth through hole 1102. In the thickness direction of the end cover, the second electrode terminal 16 includes a third portion 160 located on the outer side of the end cover and a fourth portion 161 at least partially located on the inner side of the end cover. The fourth portion 161 is connected to the second tab 121 of the electrode assembly 12 through the second adapter 124. The second insulating portion 17 includes a second insulating member 170. In some embodiments, the second insulating member 170 has an electrical resistance value of at least 200 megaohms or greater. The second insulating member 170 includes a second body 1700, a third flange 1701, and a fourth flange 1702. The second body 1700 is located between the third portion 160 and the end cover. The second body 1700 is formed with a seventh through hole 17001 corresponding to the fifth through hole 1102 for the second electrode terminal 16 to pass through and an eighth through hole 17002 corresponding to the sixth through hole 1103. The third flange 1701 is disposed on the surface of the second body 1700 facing away from the end cover. The third flange 1701 surrounds a portion of the outer circumferential surface of the third portion 160. The fourth flange 1702 is disposed around the seventh through hole 17001 and is located between the hole wall of the fifth through hole 1102 and the second electrode terminal 16.

[0352] The second deformation member 18 is welded to the inner side of the end cover and closes the sixth through hole 1103. The second deformation member 18 can be a flip tab. The second deformation member 18 is configured to be deformed to partially pass through the sixth through hole 1103 to contact the third portion 160 when the internal pressure of the battery cell 10 reaches a second threshold value.

[0353] In some embodiments, when the second electrode terminal 16 is a negative electrode terminal, the second threshold value can be greater than the first threshold value.

[0354] 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 certain level, for example, a first threshold, the first deformation member 15 deforms to short the first electrode terminal 13 and the shell 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformation member 18 deforms to short the second electrode terminal 16 and the shell 11, so that the positive and negative electrodes inside the battery cell 10 are short-circuited to cause an internal short circuit. A large current generated instantaneously can melt the electrical connection member inside the battery cell 10 to cut off the charging and discharging circuit of the battery cell 10, thereby playing a role of overcharge protection. The melted electrical connection member can include the first adapter 123 and / or the second adapter 124. For example, the first adapter 123 has a first melting portion, and the overcurrent area of the first melting portion can be smaller than that of the rest of the first adapter 123, so that the first melting portion can be melted when a large current passes through, thereby breaking the current path of the first tab 120 and the first electrode terminal 13. For example, the second adapter 124 has a second melting portion, and the overcurrent area of the second melting portion can be smaller than that of the rest of the second adapter 124, so that the second melting portion can be melted when a large current passes through, thereby breaking the current path of the second tab 121 and the second electrode terminal 16.

[0355] In the above scheme, by providing the first insulation portion 14 and the second insulation portion 17, the end cover and the first electrode terminal 13 can be effectively insulated and isolated, and the end cover and the second electrode terminal 16 can be effectively insulated and isolated, thereby reducing the risk of internal short circuit of the battery cell 10 caused by short circuit between the end cover and the electrode terminal, and improving the reliability of the battery. In particular, in an energy storage device with a high working voltage, by providing the first insulation portion 14 and the second insulation portion 17, the risk of thermal runaway of the energy storage device caused by the high-voltage electricity of the shell 11 due to the out-of-control of the remaining battery cells 10 in the battery, which leads to the conduction of the high-voltage electricity to the end cover and the electrode terminal and the internal short circuit of the battery cell 10, can be effectively reduced.

[0356] In some embodiments, the inner wall of the shell 111 is provided with a first insulation layer 19, which can be an insulation coating. The material of the insulation coating can include epoxy resin, polyurethane, acrylic resin, polyimide, phenolic resin, etc. The first insulation layer 19 can be coated on the inner wall of the shell 111 by processes such as dip coating, spray coating, electroplating, anodizing, etc.

[0357] In some embodiments, the insulation resistance of the first insulation layer 19 can satisfy 1000V, 5s, >1GΩ. In some embodiments, the first insulation layer 19 is an insulation coating, which can satisfy the following condition: no swelling in electrolyte at 60℃.

[0358] In some embodiments, in order to make the welding quality between the end cover and the shell 111 higher, the inner part of the shell 111 can be arranged in the blank area 19b which is not provided with the first insulation layer 19 and is welded with the end cover.

[0359] In the above scheme, by arranging the insulation coating on the inner wall of the shell 111, on the one hand, the electrolyte and the shell 111 can be effectively separated, the ion path between the motor assembly and the shell 111 is cut off, and the risk of corrosion of the shell 111 is reduced; on the other hand, the first insulation layer 19 can be efficiently formed on the inner wall of the shell 111 by spraying and other methods, so that the manufacturing efficiency of the battery is high; on the other hand, the insulation coating has high mechanical strength, which can effectively reduce the risk of the battery caused by the metal particles introduced by the manufacturing process to pierce and cause the electrode assembly 12 and the shell 11 to be electrically connected to each other, causing the risk of internal short circuit of the battery monomer 10 or causing the risk of corrosion of the shell 11, so that the reliability of the battery is high.

[0360] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein: include: a housing having a first wall; an electrode assembly, disposed in the housing; a first electrode terminal, disposed on the first wall and electrically connected to the electrode assembly, the first electrode terminal being used for input and output of electrical energy; The first insulating portion is provided between the first wall and the first electrode terminal, and is used for insulating and isolating the first electrode terminal from the first wall.

2. The battery cell according to claim 1, wherein: Also includes: A first deformable member is electrically connected to the first wall, and the first deformable member is configured to be deformable to contact the first electrode terminal to electrically connect the first electrode terminal to the first wall.

3. The battery cell according to claim 2, wherein: The first wall is formed with a first through hole and a second through hole, the first electrode terminal passes through the first through hole, the first deformable member closes the second through hole, and the first deformable member is configured to be deformable to partially pass through the second through hole and contact the first electrode terminal.

4. The battery cell according to claim 2 or 3, wherein: Along the thickness direction of the first wall, a projection of a first portion of the first electrode terminal located outside the first wall at least partially overlaps with a projection of the first deformable member.

5. The battery cell according to any one of claims 1 to 4, wherein: The length of the first wall is greater than or equal to 150 mm, and the width of the first wall is greater than or equal to 45 mm.

6. The battery cell according to any one of claims 1 to 5, wherein: The first wall includes a main body portion and a first reinforcement portion connected to each other, and a first portion of the first electrode terminal located outside the first wall is disposed on the first reinforcement portion.

7. The battery cell according to claim 6, wherein: The first reinforcement portion includes a first protrusion along a thickness direction of the first wall. The first protrusion protrudes from one surface of the body portion along the thickness direction of the first wall.

8. The battery cell according to claim 7, wherein: The first reinforcement portion further includes a first recessed portion. The first recessed portion is provided on the other surface of the main body portion along the thickness direction of the first wall, and the first recessed portion is provided opposite to the first protruding portion.

9. The battery cell according to claim 7 or 8, wherein: The first protrusion is located on the outer side of the first wall. The first protrusion is formed with a first positioning groove. The first positioning groove accommodates the first part to limit the movement of the first part.

10. The battery cell according to any one of claims 7 to 9, wherein: The first convex portion is located on the outer side of the first wall. Along the thickness direction of the first wall, the dimension of the first convex portion protruding from the main body portion is greater than or equal to 0.1 mm and less than or equal to 5 mm.

11. The battery cell according to any one of claims 7 to 10, wherein: Along the thickness direction of the first wall, a dimension of the first protrusion protruding from the main body is greater than or equal to 0.5 mm and less than or equal to 3 mm.

12. The battery cell according to claim 3, wherein: The first insulating portion includes a first insulating member, at least a portion of which is arranged between a first portion of the first electrode terminal located on the outside of the first wall and the first wall, and the first insulating member is formed with a third through hole and a fourth through hole. Along the thickness direction of the first wall, the third through hole is arranged opposite to the first through hole, and the fourth through hole is arranged opposite to the second through hole.

13. The battery cell according to claim 12, wherein: The first insulating member includes a first body and a first flange. The first body is located between the first part and the first wall. The first flange is arranged on a surface of the first body away from the first wall. The first flange surrounds at least a portion of the outer circumference of the first part.

14. The battery cell according to claim 13, wherein: The first insulating member further includes a second flange, which is disposed around the third through hole and is located between a hole wall of the first through hole and the first electrode terminal.

15. The battery cell according to any one of claims 2 to 14, wherein: Also includes: a second electrode terminal, disposed on the first wall and electrically connected to the electrode assembly, the second electrode terminal being used for inputting and outputting electrical energy, and having opposite polarity to the first electrode terminal; a second insulating portion, provided between the first wall and the second electrode terminal, for insulating and isolating the second electrode terminal from the first wall; A second deformable member is electrically connected to the first wall, and the second deformable member is configured to be deformable to contact the second electrode terminal to electrically connect the second electrode terminal to the first wall.

16. The battery cell according to claim 15, wherein: The second electrode terminal is a negative electrode terminal, so that a minimum pressure value causing deformation of the second deformable member is greater than a minimum pressure value causing deformation of the first deformable member.

17. The battery cell according to any one of claims 15 to 16, wherein: The first wall is formed with a fifth through hole and a sixth through hole, the second electrode terminal passes through the fifth through hole, the second deformable member closes the sixth through hole, and the second deformable member is configured to be deformable to partially pass through the sixth through hole and contact the second electrode terminal.

18. The battery cell according to claim 17, wherein: Along the thickness direction of the first wall, a projection of a third portion of the second electrode terminal located outside the first wall at least partially overlaps with a projection of the second deformable member.

19. The battery cell according to claim 17 or 18, wherein: The first wall includes a main body portion and a second reinforcement portion connected to each other, and a third portion of the second electrode terminal located outside the first wall is disposed on the second reinforcement portion.

20. The battery cell according to claim 19, wherein The second reinforcement portion includes a second protrusion protruding from one surface of the body portion in the thickness direction of the first wall.

21. The battery cell according to claim 20, wherein: The second reinforcement portion further includes a second recessed portion. The second recessed portion is provided on the other surface of the main body portion along the thickness direction of the first wall, and the second recessed portion is provided opposite to the second protruding portion.

22. The battery cell according to claim 20 or 21, wherein: The second protrusion is located on the outer side of the first wall. The second protrusion is formed with a second positioning groove. The second positioning groove accommodates the third part to limit the movement of the third part.

23. The battery cell according to any one of claims 20 to 22, wherein: The second convex portion is located on the outer side of the first wall. Along the thickness direction of the first wall, the dimension of the second convex portion protruding from the main body portion is greater than or equal to 0.1 mm and less than or equal to 5 mm.

24. The battery cell according to claim 23, wherein: Along the thickness direction of the first wall, a dimension of the second protrusion protruding from the main body is greater than or equal to 0.5 mm and less than or equal to 3 mm.

25. The battery cell according to any one of claims 17 to 24, wherein: The second insulating portion includes a second insulating member, at least a portion of which is arranged between the third portion of the second electrode terminal located on the outside of the first wall and the first wall, and the second insulating member is formed with a seventh through hole and an eighth through hole. Along the thickness direction of the first wall, the seventh through hole is arranged opposite to the fifth through hole, and the eighth through hole is arranged opposite to the sixth through hole.

26. The battery cell according to claim 25, wherein: The second insulating member includes a second body and a third flange. The second body is located between the third part and the first wall. The third flange is arranged on the surface of the second body away from the first wall. The third flange surrounds at least part of the outer circumference of the third part.

27. The battery cell according to claim 26, wherein: The second insulating member further includes a fourth flange, which is disposed around the seventh through hole and is located between a hole wall of the fifth through hole and the second electrode terminal.

28. The battery cell according to any one of claims 15 to 27, wherein: The resistance value of the second insulating portion is greater than or equal to 200 megohms.

29. The battery cell according to any one of claims 1 to 28, wherein: The resistance value of the first insulating portion is greater than or equal to 200 megohms.

30. The battery cell according to any one of claims 1 to 29, wherein: The housing comprises a shell and an end cover, wherein the shell has an opening; The first wall is the end cover, which is connected to the shell and closes the opening.

31. The battery cell according to claim 30, wherein: The inner wall of the shell is provided with a first insulating layer.

32. The battery cell according to claim 31, wherein The first insulating layer is an insulating coating provided on the inner wall of the shell.

33. The battery cell according to claim 31 or 32, wherein: Along the first direction, the inner wall of the shell includes a blank area and an insulating area connected in sequence, the insulating area is provided with the first insulating layer, the blank area is connected to the first wall, and the first direction is parallel to the first wall and points to the direction of the electrode assembly.

34. The battery cell according to claim 33, wherein: Along a second direction, a projection of the electrode assembly on the inner wall of the shell does not overlap with the blank area, and the second direction is perpendicular to the first direction.

35. The battery cell according to any one of claims 31 to 34, wherein: The thickness of the first insulating layer is greater than or equal to 60 μm and less than or equal to 200 μm.

36. The battery cell according to any one of claims 31 to 35, wherein: The thickness of the first insulating layer is greater than or equal to 80 μm and less than or equal to 130 μm.

37. The battery cell according to any one of claims 30 to 36, wherein: A second insulating layer is provided on the outer surface of the shell.

38. A battery, wherein A battery cell comprising the battery cell according to any one of claims 1 to 37.

39. An energy storage device, wherein: A battery cell comprising the battery cell according to any one of claims 1 to 37.

40. An electrical device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 37, wherein the battery cell is used to provide electrical energy.

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