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

Abstract

Disclosed in the present application are a battery cell, a battery, an energy storage device, and an electric device. The battery cell comprises a housing, a first conductive member, a first terminal, a first deformable member, and a first blocking member. The housing has a first wall. The first conductive member is at least partially disposed on the outer side of the first wall and insulated from the first wall, and the first conductive member comprises a first conductive portion and a second conductive portion, which are arranged in a first direction. The first terminal is connected to the first conductive portion. The first deformable member is electrically connected to the first wall, and the first deformable member is configured to be deformable to come into contact with the second conductive portion, so as to electrically connect the first terminal to the first wall. The first blocking member is connected to the first wall, and at least part of the first blocking member is located on the side of the second conductive portion away from the first deformable member. The technical solutions provided in the present application can improve the reliability of a battery.

Description

Battery cells, batteries, energy storage devices and electrical appliances Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202410917364.X, filed on July 9, 2024, entitled “Battery cell, battery, energy storage device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, an energy storage device, and an electrical device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

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

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

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, a first conductive element, a first terminal, a first deformable element, and a first blocking element. The casing has a first wall. The first conductive element is at least partially disposed on the outside of the first wall and is insulated from the first wall. The first conductive element includes a first conductive portion and a second conductive portion arranged along a first direction. The first terminal is connected to the first conductive portion. The first deformable element is electrically connected to the first wall and is configured to deform to contact the second conductive portion, thereby electrically connecting the first terminal to the first wall. The first blocking element is connected to the first wall, and at least a portion of the first blocking element is located on the side of the second conductive portion opposite to the first deformable element.

[0007] In the above solution, by setting at least a portion of the first blocking member on the side opposite to the first deformable member, the second conductive part can be constrained to suppress the offset of the second conductive part relative to the first deformable member. This reduces the risk that the second conductive part will deviate from the first deformable member due to the internal pressure of the battery cell, causing the first deformable member to be unable to contact the second conductive part. As a result, when the battery cell is subjected to abuse conditions such as overcharging, the first deformable member can effectively contact the second conductive part to achieve overcharge protection, which is beneficial to improving the reliability of the battery cell and thus the reliability of the battery.

[0008] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first blocking member and the orthographic projection of the first deforming member at least partially overlap.

[0009] In the above solution, by setting at least a portion of the first blocking member to face at least a portion of the first deformable member in the thickness direction perpendicular to the first wall, the portion of the second conductive part facing the first deformable member can be effectively constrained. This allows the first deformable member to deform towards the second conductive part under the internal pressure of the battery cell during overcharging or other abuse conditions, so as to contact the second conductive part constrained by the first blocking member. This effectively achieves overcharge protection, improves the reliability of the battery cell, and thus improves the reliability of the battery.

[0010] According to some embodiments of this application, along the thickness direction of the first wall, the first conductive portion has a first surface facing away from the first wall, and the first blocking member has a second surface facing away from the second conductive portion. In a direction from the inner side of the first wall to the outer side of the first wall, the first surface extends beyond the second surface, or the first surface and the second surface are flush.

[0011] In the above solution, by setting the second surface of the first blocking member to not exceed the first surface of the first conductive part, the risk of interference between the external busbar connected to the first conductive part and the first blocking member can be reduced, the difficulty of battery assembly can be reduced, the compactness of the battery structure can be improved, and the battery can have a high volumetric energy density.

[0012] According to some embodiments of this application, the strength of the first conductive part is greater than the strength of the second conductive part.

[0013] In the above scheme, the strength of the first conductive part is set to be relatively large, while the strength of the second conductive part is set to be relatively small. On the one hand, this allows the first conductive part to be effectively connected to the first terminal, ensuring the stability of power input and output to a certain extent and improving battery reliability. On the other hand, it makes the second conductive part easier to deform. When the internal pressure of the battery cell acts on the first conductive part, the second conductive part is constrained by the first blocking member and deforms to fit tightly against the first wall. Thus, the first deformable member can effectively contact the second conductive part to achieve overcharge protection, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0014] According to some embodiments of this application, the thickness of the second conductive portion is less than the thickness of the first conductive portion along the thickness direction of the first wall.

[0015] In the above solution, by reducing the thickness of the second conductive part, the strength of the second conductive part can be effectively reduced, so that the first blocking member can effectively constrain the second conductive part and make the second conductive part closely adhere to the first wall. Thus, the first deformable member can effectively contact the second conductive part to achieve overcharge protection, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0016] According to some embodiments of this application, the thickness of the second conductive portion is greater than or equal to 0.5 mm and less than or equal to 3.0 mm along the thickness direction of the first wall.

[0017] In the above scheme, by setting the thickness of the second conductive part to be greater than or equal to 0.5 mm, the overcurrent capacity of the first conductive part can be guaranteed to a certain extent, reducing the risk of overcharge protection failure caused by the large current generated when the first deformable part contacts the second conductive part and melts the first conductive part. This is beneficial to improving the reliability of the battery cell and the battery overall. By setting the thickness of the second conductive part to be less than or equal to 3.0 mm, the strength of the second conductive part is reduced, which improves the constraint effect of the first blocking member on the second conductive part. This allows the second conductive part to adhere tightly to the first wall and effectively contact the first deformable part to achieve overcharge protection, thereby improving the reliability of the battery cell and the battery overall. Therefore, by setting the thickness of the second conductive part to be greater than or equal to 0.5 mm and less than or equal to 3 mm, both the overcurrent capacity of the first conductive part and the reliability of overcharge protection can be balanced, thus improving the battery overall reliability.

[0018] According to some embodiments of this application, the thickness of the second conductive portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm along the thickness direction of the first wall.

[0019] In the above scheme, by setting the thickness of the second conductive part to be greater than or equal to 1.0 mm, the overcurrent capacity of the first conductive part can be guaranteed to a certain extent, effectively reducing the risk of overcharge protection failure caused by the large current generated by the contact between the first deformable part and the second conductive part melting the first conductive part, which is beneficial to improving the reliability of the battery cell and the battery. By setting the thickness of the second conductive part to be less than or equal to 2.0 mm, the strength of the second conductive part is reduced, allowing the first blocking member to effectively constrain the second conductive part, so that the second conductive part is in close contact with the first wall and can effectively contact the first deformable part, thereby realizing the overcharge protection function of the battery cell, thereby improving the reliability of the battery cell and the battery. Therefore, by setting the thickness of the second conductive part to be greater than or equal to 1.0 mm and less than or equal to 2 mm, the overcurrent capacity of the first conductive part and the reliability of overcharge protection can be effectively balanced, thereby improving the reliability of the battery.

[0020] According to some embodiments of this application, along the thickness direction of the first wall, the first conductive portion has a first surface facing away from the first wall, and the second conductive portion has a third surface facing away from the first wall. In the direction from the inner side of the first wall to the outer side of the first wall, the first surface protrudes beyond the third surface by a dimension greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0021] In the above solution, by setting the first conductive part to protrude from the second conductive part, and the protrusion size is greater than or equal to 0.5 mm and less than or equal to 3.0 mm, sufficient space can be reserved for the first blocking member. On the one hand, the first blocking member can effectively constrain the second conductive part, so that the second conductive part can effectively contact the first deformable member to achieve overcharge protection, which is beneficial to improving battery reliability. On the other hand, it can reduce the interference of the first blocking member on the external busbar component, which is beneficial to improving the volumetric energy density of the battery.

[0022] According to some embodiments of this application, in the direction from the inner side of the first wall to the outer side of the first wall, the first surface protrudes from the third surface by a dimension greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

[0023] In the above solution, by making the first conductive part protrude from the second conductive part by a size greater than or equal to 1.0 mm and less than or equal to 1.5 mm, sufficient space can be effectively reserved for the first blocking member. On the one hand, the first blocking member can effectively constrain the second conductive part, so that the second conductive part can effectively contact the first deformable member to achieve overcharge protection, which is beneficial to improving battery reliability. On the other hand, it can reduce the interference of the first blocking member on the external busbar component, which is beneficial to improving the volumetric energy density of the battery.

[0024] According to some embodiments of this application, the first conductive member further includes a weak portion, which is disposed between the first conductive portion and the second conductive portion.

[0025] In the above solution, by setting a weak part between the first conductive part and the second conductive part, the second conductive part deforms relative to the first conductive part along the weak part under the pressure inside the battery cell and the constraint of the first blocking member, so that the second conductive part can contact the first deforming member to achieve overcharge protection, thereby making the battery cell highly reliable, and thus making the battery highly reliable.

[0026] According to some embodiments of this application, a first groove is provided on one side of the first conductive element along the thickness direction of the first wall, and the part of the first conductive element corresponding to the first groove is a weak part.

[0027] In the above solution, by setting a first groove on one side of the first conductive component as a stress groove, on the one hand, the stress concentration caused by the internal pressure of the battery cell and the constraint of the first blocking component is reduced, thus reducing the risk of the first conductive component breaking; on the other hand, it is beneficial for the second conductive part to deform under the constraint of the first blocking component and to contact the first deformable part, so as to effectively trigger the overcharge protection mechanism under the abuse conditions such as overcharging of the battery cell, thereby making the reliability of the battery cell high, and thus making the reliability of the battery high.

[0028] According to some embodiments of this application, the depth of the first groove along the thickness direction of the first wall is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0029] In the above scheme, by setting the depth of the first groove to be greater than or equal to 0.1 mm, the second conductive part can deform under the constraint of the first blocking member and come into contact with the first deformable part. This allows the overcharge protection mechanism to be effectively triggered under abuse conditions such as overcharging of the battery cell, thereby improving the reliability of the battery cell and thus the reliability of the battery. Setting the depth of the first groove to be less than or equal to 2.0 mm can, to a certain extent, ensure the overcurrent capacity of the first conductive part and reduce the risk of the overcharge protection failing due to the first conductive part being melted by a large current. This also improves the reliability of the battery cell and thus the reliability of the battery.

[0030] According to some embodiments of this application, the depth of the first groove along the thickness direction of the first wall is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0031] In the above scheme, by setting the depth of the first groove to be greater than or equal to 0.5 mm, the second conductive part can be effectively deformed under the constraint of the first blocking member and can contact the first deformable part. This effectively triggers the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell, thereby improving the reliability of the battery cell and thus the reliability of the battery. Setting the depth of the first groove to be less than or equal to 1.0 mm can ensure the overcurrent capacity of the first conductive part to a certain extent, effectively reducing the risk of the first conductive part being melted by a large current and causing the overcharge protection to fail, thus improving the reliability of the battery cell and thus the reliability of the battery.

[0032] According to some embodiments of this application, along the first direction, the maximum width of the first groove is greater than or equal to 0.1 mm and less than or equal to 3.0 mm.

[0033] In the above scheme, by setting the maximum width of the first groove to be greater than or equal to 0.1 mm, the second conductive part can deform under the constraint of the first blocking member and come into contact with the first deformable part. This allows the overcharge protection mechanism to be effectively triggered under abuse conditions such as overcharging of the battery cell, thereby improving the reliability of the battery cell and thus the reliability of the battery. Setting the width of the first groove to be less than or equal to 3.0 mm can, to a certain extent, ensure the overcurrent capacity of the first conductive part and reduce the risk of the overcharge protection failing due to the first conductive part being melted by a large current. This also improves the reliability of the battery cell and thus the reliability of the battery.

[0034] According to some embodiments of this application, along the first direction, the maximum width of the first groove is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0035] In the above scheme, by setting the width of the first groove to be greater than or equal to 0.5 mm, the second conductive part can be effectively deformed under the constraint of the first blocking member and can contact the first deformable member. This effectively triggers the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell, thereby improving the reliability of the battery cell and thus the reliability of the battery. Setting the width of the first groove to be less than or equal to 1.5 mm can ensure the overcurrent capacity of the first conductive part to a certain extent, effectively reducing the risk of the first conductive part being melted by a large current and causing the overcharge protection to fail, thus improving the reliability of the battery cell and thus the reliability of the battery.

[0036] According to some embodiments of this application, the two ends of the first blocking member that are opposite to each other along the second direction are respectively connected to the first wall, and the second direction, the first direction and the thickness direction of the first wall are perpendicular to each other.

[0037] In the above scheme, the first blocking member is disposed on the first wall along the second direction so that it can cross the second conductive part in the second direction and effectively constrain the second conductive part to suppress the second conductive part from shifting in the direction away from the first deformable member. When the battery cell is under abuse conditions such as overcharging, the first deformable member can effectively contact the second conductive part to achieve overcharge protection, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0038] According to some embodiments of this application, the battery cell further includes a first insulating member, at least a portion of which is disposed between the first conductive member and the first wall for insulating and isolating the first conductive member and the first wall.

[0039] In the above solution, by setting a first insulating element between the first conductive element and the first wall, the risk of the first conductive element directly contacting the first wall and causing a short circuit inside the battery cell can be reduced, thus making the battery cell more reliable and the battery more reliable.

[0040] According to some embodiments of this application, a second groove is formed on the outer surface of the first wall, a first conductive member is disposed in the second groove, and at least a portion of the first insulating member is disposed in the second groove.

[0041] In the above scheme, by setting the second groove, the assembly and positioning of the first conductive component and the first insulating component relative to the first wall can be realized, reducing the assembly difficulty of the first conductive component and the first insulating component, so that the battery cell has a higher manufacturing efficiency, and thus the battery has a higher manufacturing efficiency.

[0042] According to some embodiments of this application, the second groove includes two first groove sidewalls that are opposite to each other along a second direction, at least one of the first groove sidewalls being formed with a first positioning groove, and one end of the first blocking member along the second direction being disposed in the first positioning groove.

[0043] In the above solution, by setting a first positioning groove on the side wall of the second groove, the end of the first blocking member is positioned on the first wall, thereby improving the assembly accuracy of the first blocking member and reducing the assembly difficulty of the first blocking member, which is conducive to improving the manufacturing efficiency of the battery cell, and thus to improving the manufacturing efficiency of the battery.

[0044] According to some embodiments of this application, a first clearance groove is formed on at least one side of the first insulating member along the second direction, and a first positioning groove corresponds to the position of the first clearance groove. The first clearance groove is used to avoid the first blocking member.

[0045] In the above solution, by setting a first clearance groove on the first insulating member to correspond to the first positioning groove, the risk of interference between the first insulating member and the first blocking member, which could lead to damage to the first insulating member or failure of the first blocking member to restrain the second conductive part, can be reduced, thereby making the battery cell have higher reliability and thus the battery has higher reliability.

[0046] According to some embodiments of this application, the first blocking member includes a first top wall, a first side wall, and a second side wall. The first side wall and the second side wall are spaced apart along a second direction, and the first top wall connects the first side wall and the second side wall. At least a portion of the second conductive portion is located between the first side wall and the second side wall, and the first top wall is located on the side of the second conductive portion opposite to the first deformable member. The second direction, the first direction, and the thickness direction of the first wall are all perpendicular to each other.

[0047] In the above scheme, the first blocking member has a simple structure. The first sidewall, the first top wall, and the second sidewall can form an arched structure to allow the second conductive part to be connected and constrained by the first top wall to suppress the second conductive part from shifting in the direction away from the first deformable member. This allows the first deformable member to contact the second conductive part to achieve overcharge protection, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0048] According to some embodiments of this application, the first blocking member further includes a first flange and a second flange. The first flange is connected to one end of the first sidewall that is away from the first top wall, and the second flange is connected to one end of the second sidewall that is away from the first top wall. The first flange and the second flange are respectively connected to the first wall.

[0049] In the above scheme, by setting the first flange and the second flange, the first blocking member and the first wall can have a large connection area, thereby enabling a stable connection between the first blocking member and the first wall. This effectively constrains the second conductive part, allowing the first deformable member to contact the second conductive part to achieve overcharge protection, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0050] According to some embodiments of this application, a second insulating member is provided on the side of the first blocking member away from the first wall, the second insulating member being used to insulate and isolate the first blocking member from an external busbar component, and / or a third insulating member is provided on the side of the first blocking member facing the first wall, the third insulating member being used to insulate and isolate the first blocking member and the second conductive part.

[0051] In the above solution, by providing a second insulating element on the first blocking element, the first blocking element and the external busbar can be effectively insulated and isolated to reduce the internal resistance of the battery and improve the charging and discharging performance of the battery. By providing a third insulating element on the first blocking element, the first blocking element and the second conductive part can be effectively insulated and isolated, reducing the risk of internal short circuits in the battery cell caused by electrical connection between the first wall and the first conductive element, thus giving the battery cell higher reliability and consequently the battery higher reliability.

[0052] According to some embodiments of this application, the thickness of the second insulating member along the thickness direction of the first wall is not less than 0.4 mm and not more than 0.8 mm. The thickness of the third insulating member along the thickness direction of the first wall is not less than 0.4 mm and not more than 0.8 mm.

[0053] In the above scheme, by limiting the thickness of the second insulating member to not less than 0.4 mm and not more than 0.8 mm, the insulation between the first blocking member and the external current-carrying component can be balanced while reducing the space occupied by the second insulating member inside the battery. By limiting the thickness of the third insulating member to not less than 0.4 mm and not more than 0.8 mm, the insulation between the first wall and the first conductive member can be balanced while reducing the space occupied by the third insulating member inside the battery, resulting in a battery with high mass energy density and volumetric energy density.

[0054] According to some embodiments of this application, the first blocking member, the second insulating member, and the third insulating member are integrally formed.

[0055] In the above scheme, the first blocking component, the second insulating component, and the third insulating component are manufactured using an integrated molding process, which can improve the manufacturing efficiency of the first blocking component and the assembly efficiency of the battery cell, thereby making the battery manufacturing efficiency high.

[0056] According to some embodiments of this application, the battery cell further includes a second conductive element, a second terminal, and a second deformable element. At least a portion of the second conductive element is disposed on the outside of the first wall and is insulated from the first wall. The second terminal is connected to the second conductive element. The second deformable element is electrically connected to the first wall and is configured to deform to electrically connect with the second conductive element, thereby electrically connecting the second terminal to the first wall.

[0057] In the above scheme, by setting a second deformable component, when the internal pressure of the battery cell reaches a certain level, the deformation of the second deformable component allows it to contact the second conductive component, thereby making the second electrode post electrically connected to the first wall. In conjunction with the contact between the first deformable component and the first conductive component, the electrical connection components inside the battery cell melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection and reduces the risk of thermal runaway of the battery cell, thereby making the battery more reliable.

[0058] According to some embodiments of this application, the second conductive member includes a third conductive portion and a fourth conductive portion arranged along a first direction. The third conductive portion is connected to the second terminal post, and the second deformable member is used to contact the fourth conductive portion. The battery cell also includes a second blocking member connected to the first wall, at least a portion of which is located on the side of the fourth conductive portion opposite to the second deformable member.

[0059] In the above solution, by setting a second blocking member and placing at least a portion of the second blocking member on the side of the fourth conductive part away from the second deformable member, the offset of the fourth conductive part relative to the second deformable member can be effectively limited. This effectively reduces the risk that the fourth conductive part will deviate from the second deformable member due to the internal pressure of the battery cell, causing the second deformable member to be unable to contact the fourth conductive part. This allows the second deformable member to effectively contact the fourth conductive part to achieve overcharge protection when the battery cell is subjected to abuse conditions such as overcharging, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0060] According to some embodiments of this application, the minimum distance between the first blocking member and the first pole post along the first direction is different from the minimum distance between the second blocking member and the second pole post.

[0061] In the above scheme, by setting the minimum distance between the first blocking component and the first terminal post to be different from the minimum distance between the second blocking component and the second terminal post, a foolproof function can be achieved, reducing the risk of incorrect installation of the first conductive component or the second conductive component, which is conducive to improving the manufacturing efficiency of battery cells, and thus to improving the manufacturing efficiency of the battery.

[0062] Secondly, some embodiments of this application provide a battery, which includes the battery cell provided in the first aspect.

[0063] Thirdly, some embodiments of this application provide an energy storage device, wherein the energy storage device is a battery cell provided in the first aspect.

[0064] Fourthly, some embodiments of this application provide an electrical device, which includes a battery cell provided in the first aspect and / or a battery provided in the second aspect. The battery cell is used to provide electrical energy.

[0065] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 is a schematic diagram of the vehicle in some embodiments of this application;

[0068] Figure 2 is a schematic diagram of an energy storage device in some embodiments of this application;

[0069] Figure 3 is an exploded perspective view of the battery in some embodiments of this application;

[0070] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0071] Figure 5 is a perspective view of a partial structure of a battery cell in some embodiments of this application;

[0072] Figure 6 is a top view of a battery cell in some embodiments of this application;

[0073] Figure 7 is a cross-sectional view along view AA in Figure 6;

[0074] Figure 8 is a schematic diagram of the first wall, the first deformable member, the first electrode terminal, and the first blocking member in some embodiments of this application;

[0075] Figure 9 is a partial sectional view of the view along the BB direction in Figure 6;

[0076] Figure 10 is a perspective view of the first conductive element in some embodiments of this application;

[0077] Figure 11 is a side view of the first conductive element in some embodiments of this application;

[0078] Figure 12 is a schematic diagram of a partial structure of the first insulating member and the first wall in some embodiments of this application;

[0079] Figure 13 is a schematic diagram of the structure of the first blocking member in some embodiments of this application;

[0080] Figure 14 is a schematic diagram of the first wall, the first deformable member, the second electrode terminal, and the second blocking member in some embodiments of this application;

[0081] Figure 15 is a top view of the first wall in some embodiments of this application.

[0082] Icons: 10000 - Vehicle; 20000 - Energy Storage Device; 20001 - Cabinet; 1000 - Battery; 2000 - Controller; 3000 - Motor; 100 - Battery Cell; 200 - Housing; 210 - First Housing Section; 220 - Second Housing Section; 10 - Outer Shell; 11 - Housing; 12 - First Wall; 120 - First Through Hole; 121 - Second Through Hole; 122 - Third Through Hole; 123 - Fourth Through hole; 124-Second groove; 1240-First positioning groove; 125-Fourth groove; 1250-Second positioning groove; 20-Electrode assembly; 21-First electrode tab; 22-First adapter; 23-Second electrode tab; 24-Second adapter; 30-First electrode terminal; 31-First conductive element; 310-First conductive part; 3100-First surface; 3101-Rivet hole; 311-Second conductive part; 31 10 - Third surface; 312 - Weak part; 3120 - First groove; 32 - First pole post; 33 - First deformable part; 40 - Second electrode terminal; 41 - Second conductive part; 410 - Third conductive part; 411 - Fourth conductive part; 412 - Third groove; 42 - Second pole post; 43 - Second deformable part; 50 - First insulating part; 51 - First clearance groove; 52 - First perforation; 53 - Second perforation; 60 - Third insulating structure; 601 - Second clearance groove; 61 - Fourth insulating structure; 70 - Fifth insulating structure; 80 - First blocking part; 81 - Second surface; 82 - First top wall; 83 - First side wall; 84 - Second side wall; 85 - First flange; 86 - Second flange; 87 - Second insulating part; 88 - Third insulating part; 90 - Second blocking part; x - First direction; y - Second direction; z - Thickness direction of the first wall. Detailed Implementation

[0083] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0084] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0085] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0086] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0087] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0088] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0089] In the description of the embodiments of this application, the technical terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0090] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0091] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cuboid or other shapes, etc., and the embodiments of this application are not limited thereto. The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a casing for encapsulating one or more battery cells. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0092] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement (e.g., insertion / extraction) of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector and serves as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector and serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0093] The battery cell also includes a casing, an electrode assembly, and an electrolyte disposed inside the casing. The casing has a first wall with electrode terminals connected to the electrode assembly. The electrode terminals are used for the input and output of electrical energy. In some embodiments, the electrode terminals include interconnected conductive elements and terminals. The conductive elements are located outside the first wall for connection to an external busbar to achieve the input and output of electrical energy. The terminals are connected to or indirectly connected to the tabs of the electrode assembly.

[0094] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0095] To reduce the risk of thermal runaway in battery cells under abusive conditions such as overcharging, some battery cells are currently equipped with overcharge protection structures. For example, the overcharge protection structure includes a deformable component electrically connected to the casing. Under abusive conditions such as overcharging, when the internal pressure of the battery cell increases to a certain extent, the deformable component deforms under the internal pressure and can contact the electrode terminals, for example, connecting with a conductive component. This short-circuits the casing and the electrode terminals, causing a short circuit between the positive and negative terminals of the battery cell. The internal electrical connection components of the battery cell melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell and providing overcharge protection.

[0096] However, when the internal pressure of a battery cell increases, causing the battery cell to expand, the conductive components are impacted. This causes the parts that are meant to contact the deformed components to shift away from the first wall, preventing the deformed components from contacting the conductive components. Consequently, the overcharge protection of the battery cell fails, affecting the reliability of the battery.

[0097] In view of this, to improve the problem that the conductive element is deviated from the first wall due to the internal pressure impact of the battery cell, causing the deformable element to be unable to contact the conductive element, resulting in the failure of overcharge protection and affecting the reliability of the battery, some embodiments of this application provide a battery cell. The battery cell includes a casing, a first conductive element, a first terminal, a first deformable element, and a first blocking element. The casing has a first wall. The first conductive element is at least partially disposed on the outside of the first wall and is insulated from the first wall. The first conductive element includes a first conductive portion and a second conductive portion arranged along a first direction. The first terminal is connected to the first conductive portion. The first deformable element is electrically connected to the first wall and is configured to deform to contact the second conductive portion, so as to electrically connect the first terminal to the first wall. The first blocking element is connected to the first wall, and at least a portion of the first blocking element is located on the side of the second conductive portion opposite to the first deformable element.

[0098] In the above solution, by setting at least a portion of the first blocking member on the side opposite to the first deformable member, the second conductive part can be constrained to suppress the offset of the second conductive part relative to the first deformable member. This reduces the risk that the second conductive part will deviate from the first deformable member due to the internal pressure of the battery cell, causing the first deformable member to be unable to contact the second conductive part. As a result, when the battery cell is subjected to abuse conditions such as overcharging, the first deformable member can effectively contact the second conductive part to achieve overcharge protection, which is beneficial to improving the reliability of the battery cell and thus the reliability of the battery.

[0099] The technical solutions described in the embodiments of this application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0100] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more batteries mounted on the cabinet.

[0101] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0102] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0103] Figure 1 is a schematic diagram of vehicle 10000 in some embodiments of this application.

[0104] The vehicle 10000 can house a controller 2000, a motor 3000, and a battery 1000. The controller 2000 controls the battery 1000 to supply power to the motor 3000. For example, the battery 1000 can be located at the bottom, front, or rear of the vehicle 10000. The battery 1000 can be used to power the vehicle 10000; for example, it can serve as the operating power source for the vehicle 10000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery 10000 can not only serve as the operating power source for the vehicle 10000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 10000.

[0105] Please refer to Figure 2, which is a schematic diagram of the energy storage device 20000 in some embodiments of this application.

[0106] The energy storage device 20000 may include a cabinet 20001 and multiple batteries 1000. The multiple batteries 1000 may be housed within the cabinet 20001. The multiple batteries 1000 may be connected in series, in parallel, or in a mixed configuration.

[0107] Please refer to Figure 3, which is an exploded perspective view of the battery 1000 in some embodiments of this application.

[0108] The battery 1000 includes a battery cell 100 and a housing 200, with the battery cell 100 housed within the housing 200. The housing 200 provides a space for the battery cell 100 and can have various structures. In some embodiments, the housing 200 may include a first housing portion 210 and a second housing portion 220, which overlap each other, together defining a space for accommodating the battery cell 100. The second housing portion 220 can be a hollow structure with one end open, and the first housing portion 210 can be a plate-like structure. The first housing portion 210 covers the open side of the second housing portion 220 so that the first housing portion 210 and the second housing portion 220 together define an accommodating space. Alternatively, both the first housing portion 210 and the second housing portion 220 can be hollow structures with one side open, and the open side of the first housing portion 210 covers the open side of the second housing portion 220. Of course, the housing 200 formed by the first housing portion 210 and the second housing portion 220 can be of various shapes, such as a cylinder, a cuboid, etc.

[0109] In the battery 1000, there can be one or more battery cells 100, and each battery cell 100 can be fixed to the housing 200 by means of connectors (such as bolts), or each battery cell 100 can be fixed to the housing 200 by means of adhesive bonding.

[0110] This application provides a battery cell 100 in some embodiments. Please refer to Figures 4-9. Figure 4 is an exploded perspective view of the battery cell 100 in some embodiments of this application. Figure 5 is a perspective view of a partial structure of the battery cell 100 in some embodiments of this application. Figure 6 is a top view of the battery cell 100 in some embodiments of this application. Figure 7 is a cross-sectional view along the AA direction in Figure 6. Figure 8 is a schematic diagram of the first wall 12, the first deformable member 33, the first electrode terminal 30, and the first blocking member 80 in some embodiments of this application. Figure 9 is a partial cross-sectional view along the BB direction in Figure 6.

[0111] The battery cell 100 includes a housing 10, a first conductive element 31, a first terminal 32, a first deformable element 33, and a first blocking element 80. The housing 10 has a first wall 12. The first conductive element 31 is at least partially disposed on the outside of the first wall 12 and is insulated from the first wall 12. The first conductive element 31 includes a first conductive portion 310 and a second conductive portion 311 arranged along a first direction x. The first terminal 32 is connected to the first conductive portion 310. The first deformable element 33 is electrically connected to the first wall 12 and is configured to deform to contact the second conductive portion 311 to electrically connect the first terminal 32 to the first wall 12. The first blocking element 80 is connected to the first wall 12, and at least a portion of the first blocking element 80 is located on the side of the second conductive portion 311 opposite to the first deformable element 33.

[0112] The housing 10 is a component for accommodating the electrode assembly 20. The housing 10 can also accommodate an electrolyte, such as an electrolyte solution. Referring to Figure 4, in some embodiments, the housing 10 includes a shell 11 and an end cap. The shell 11 has an internal cavity for accommodating the electrode assembly 20. The shell 11 has an opening communicating with the cavity. The end cap closes to the opening of the shell 11, forming a sealed connection to create a sealed space for accommodating the electrode assembly 20 and the electrolyte. The end cap can be connected to the shell 11 by welding, bonding, snap-fitting, or other connection methods. Optionally, the housing 10 may also include a base plate. Openings are formed at both ends of the shell 11, one of which is closed by the end cap, and the other opening is closed by the base plate.

[0113] In some embodiments, the material of the housing 10 may be metal or a combination of metal and non-metal. For example, the housing 10 may be made of metal, such as copper, iron, aluminum, steel or aluminum alloy. Alternatively, some parts of the housing 10 may be made of metal, while the rest may be made of non-metal. For example, the end caps of the housing 10 may be made of metal, while the shell 11 or other parts of the housing 10 may be made of non-metallic materials.

[0114] In some embodiments, the housing 10 may be a sealed structure or a non-sealed structure.

[0115] As an example, when the outer casing 10 is a non-sealed structure, it only serves to protect the electrode assembly. The battery cell 100 includes a sealant for encapsulating components such as the electrode assembly and electrolyte. The outer casing 10 is disposed outside the sealant to protect the electrode assembly or to limit the expansion of the electrode assembly. Specifically, the sealant can be a bag-shaped insulating material or an aluminum-plastic film, covering the outside of the electrode assembly and serving to insulate the electrode assembly and the outer casing 10.

[0116] In some embodiments, when assembling the battery cell 100, the electrode assembly 20 can be placed into the housing 11 first, and electrolyte can be filled into the housing 11. Then, the end cap can be closed onto the opening of the housing 11 to complete the assembly of the battery cell 100. Alternatively, in some embodiments, when assembling the battery cell 100, the electrode assembly 20 can be placed into the housing 11 first, and then the end cap can be closed onto the opening of the housing 11. Electrolyte can then be filled into the housing 11 through the injection hole on the end cap, and then the injection hole can be closed to complete the assembly of the battery cell 100.

[0117] The outer casing 10 can be of various shapes, such as a cylinder or a prism. The shape of the outer casing 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cylindrical structure, then a cylindrical outer casing 10 can be selected. If the electrode assembly 20 is a flat structure, then the outer casing 10 can be square.

[0118] The first wall 12 is a part of the outer casing 10. The first wall 12 can be used to support the first electrode terminal 30, which can be connected to an external busbar to achieve power input and output. The external busbar can be a power strip. In some embodiments, the first wall 12 can be a part of the casing 11, such as a side wall or bottom wall of the casing 11. In some embodiments, the first wall 12 can be an end cap.

[0119] The first electrode terminal 30 is a component mounted on the first wall 12. The first electrode terminal 30 is used for electrical connection with the electrode assembly 20, allowing current to flow into or out of the first tab 21 via the first electrode terminal 30. The first electrode terminal 30 and the first tab 21 have the same polarity. In some embodiments, the first electrode terminal 30 is made of a metallic material, such as copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the first electrode terminal 30 can be connected to the first tab 21 via a first adapter 22. Exemplarily, the first tab 21 of the electrode assembly 20 is composed of multiple stacked first sub-tabs. One end of the first adapter 22 can be welded to the first tab 21, and then the other end of the first adapter 22 can be welded to the first electrode terminal 30.

[0120] In some embodiments, the first electrode terminal 30 includes a first conductive element 31 and a first electrode post 32. The first conductive element 31 is located on the side of the first wall 12 opposite to the electrode assembly 20. The first conductive element 31 is used to connect to an external busbar (e.g., a power strip). In some embodiments, the first conductive element 31 is generally plate-shaped and can be a riveted tab. The first conductive element 31 includes a first conductive portion 310 and a second conductive portion 311 arranged along a first direction x, which is perpendicular to the thickness direction z of the first wall. A portion of the first electrode post 32 is located inside the housing 10. The first electrode post 32 can be electrically connected to the first tab 21 of the electrode assembly 20, for example, the first electrode post 32 is connected to the first tab 21 via a first adapter 22, and the end of the first electrode post 32 opposite to the electrode assembly 20 can pass through the first wall 12 and connect to the first conductive portion 310. The connection relationship between the first electrode post 32 and the first conductive portion 310 includes, but is not limited to, welding, riveting, threaded connection, or other connection methods. The first conductive part 310 is used to connect with the busbar component for the input and output of electrical energy. Exemplarily, the first conductive part 310 is welded to the busbar component on the surface opposite to the first wall 12.

[0121] For example, the first conductive part 310 is formed with a riveting hole 3101, the first wall 12 is formed with a first through hole 120, the end of the first pole post 32 facing away from the electrode assembly 20 passes through the first through hole 120 and is riveted into the riveting hole, and the surface of the first conductive part 310 facing away from the first wall 12 is used for welding with the plate.

[0122] In some embodiments, the first conductive part 310 and the second conductive part 311 can be directly connected, or indirectly connected through other structural components, or the first conductive part 310 and the second conductive part 311 can be integrally formed.

[0123] In some embodiments, the first conductive part 310 and the second conductive part 311 may be made of the same or different materials. For example, both the first conductive part 310 and the second conductive part 311 may be made of aluminum, aluminum alloy, copper, copper alloy, stainless steel, or other metal materials. Another example is that the first conductive part 310 may be made of copper, and the second conductive part 311 may be made of aluminum.

[0124] In some embodiments, a first insulating structure is provided between the first conductive element 31 and the first wall 12, such that the first conductive element 31 and the first wall 12 are mutually insulated. A second insulating structure is provided between the first pole post 32 and the first wall 12, for example, a second insulating structure is provided between the outer periphery of the first pole post 32 and the wall of the first through hole 120.

[0125] In some embodiments, the first insulating structure and / or the second insulating structure can be made of materials with high resistivity, such as organic insulating materials, inorganic insulating materials, or mixed insulating materials. Exemplarily, in some embodiments of this application, the materials of the first insulating structure and / or the second insulating structure may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulating structure and / or the second insulating structure may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0126] In some embodiments, the resistance value of the first insulation structure and / or the second insulation structure can be expressed in megaohms (MΩ). For example, in some embodiments of the battery cell 100 provided in this application, the resistance value of the first insulation structure and / or the second insulation structure can be greater than or equal to 200 MΩ.

[0127] The first deformable member 33 is mounted on the first wall 12 and is electrically connected to the first wall 12. In some embodiments, the first deformable member 33 may be made of a metallic material, such as copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the first deformable member 33 may be welded to the inner surface of the first wall 12.

[0128] The first deformable member 33 is a structural component that deforms under the internal pressure of the battery cell 100. The first deformable member 33 is used for overcharge protection of the battery cell 100. For example, the first wall 12 has a second through hole 121, and the second conductive part 311 closes the second through hole 121. The first deformable member 33 is a flip piece, and the edge of the flip piece is welded to the inner side of the first wall 12. When the battery cell 100 is under abuse conditions such as overcharging, the internal pressure increases. When the internal pressure reaches a certain level, such as a first threshold, the first deformable member 33 deforms toward the second through hole 121 to be able to contact the second conductive part 311, thereby connecting the first wall 12 and the first electrode terminal 30, so that the positive and negative electrodes inside the battery cell 100 are short-circuited.

[0129] In some embodiments, the first electrode post 32 is electrically connected to the first electrode tab 21 via the first adapter 22. The second electrode tab 23 of the electrode assembly 20 can be electrically connected to the housing 10. The second electrode tab 23 has the opposite polarity to the first electrode tab 21. The second electrode tab 23 is directly connected to the housing 10 or via the second adapter 24. Alternatively, the housing 10 is provided with a second electrode terminal 40, which is electrically connected to the housing 10, and the second electrode tab 23 is directly connected to the second electrode terminal 40 or via the second adapter 24. When the internal pressure of the battery cell 100 reaches a first threshold, the first deformable member 33 deforms, short-circuiting the first electrode terminal 30 and the housing 10. This short-circuit the positive and negative electrodes inside the battery cell 100, and the instantaneously generated large current can melt the electrical connection components inside the battery cell 100, cutting off the charging and discharging circuit of the battery cell 100, thereby providing overcharge protection. The melted electrical connection components may include the first adapter 22 and / or the second adapter 24. For example, the first adapter 22 has a first fusible portion, the thickness or width of which may be smaller than the thickness or width of the rest of the first adapter 22, so that when a large current passes through, the first fusible portion can melt and break the current path between the first tab 21 and the first electrode terminal 30. For example, the second adapter 24 has a second fusible portion, so that when a large current passes through, the second fusible portion can melt and break the current path between the second tab 23 and the second electrode terminal 40 or the housing 10.

[0130] In other embodiments, the first electrode terminal 30 is electrically connected to the first tab 21 via a first adapter 22. The second tab 23 of the electrode assembly 20 can be electrically connected to the second electrode terminal 40. The second tab 23 has the opposite polarity to the first tab 21. The second electrode terminal 40 can be insulatedly mounted to the housing 10, for example, insulatedly mounted to the first wall 12 of the housing 10. The second tab 23 can be electrically connected to the second electrode terminal 40 via a second adapter 24. The second electrode terminal 40 is correspondingly provided with a second deformable member 43, which is electrically connected to the housing 10. The second deformable member 43 is used to deform to contact the second electrode terminal 40 when the internal pressure of the battery cell 100 reaches a second threshold, so as to electrically connect the second electrode terminal 40 to the housing 10.

[0131] When the internal pressure of the battery cell 100 reaches a certain level, such as a first threshold, the first deformable member 33 deforms and contacts the second conductive part 311, short-circuiting the first electrode terminal 30 and the outer casing 10. When the internal pressure of the battery cell 100 reaches a second threshold, the second deformable member 43 deforms, short-circuiting the second electrode terminal 40 and the outer casing 10, thereby short-circuiting the positive and negative electrodes inside the battery cell 100 to form an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 100, cutting off the charging and discharging circuit of the battery cell 100, thus providing overcharge protection. The melted electrical connection components may include a first adapter 22 and / or a second adapter 24. For example, the first adapter 22 has a first fuse portion, which can melt when a large current passes through, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 30.

[0132] The first blocking member 80 is connected to the first wall 12. In some embodiments, the first blocking member 80 may be directly or indirectly connected to the first wall 12. In some embodiments, the connection between the first blocking member 80 and the first wall 12 includes, but is not limited to, bonding, welding, snap-fitting, riveting, threaded connection, or other connection methods. Along the thickness direction z of the first wall, the shape of the projection of the first blocking member 80 onto the first wall 12 includes, but is not limited to, a strip shape, a square shape, a serpentine shape, a triangle shape, or other shapes.

[0133] "At least a portion of the first blocking member 80 is located on the side of the second conductive part 311 away from the first deformable member 33" can be understood as the first blocking member 80 and the first conductive part 310 at least partially overlap, for example, partially overlap or completely overlap, on the same projection plane perpendicular to the thickness direction of the first wall 12.

[0134] The first blocking member 80 can be used to constrain the second conductive portion 311 and suppress the displacement of the second conductive portion 311 in a direction away from the first deformable member 33. In some embodiments, the first blocking member 80 can be in contact with the second conductive portion 311, or the first blocking member 80 can abut against the second conductive portion 311 to press the second conductive portion 311 against the first wall 12. In other embodiments, along the thickness direction z of the first wall, the first blocking member 80 and the second conductive portion 311 are not in contact, and there is a small gap between the first blocking member 80 and the second conductive portion 311 so that when the second conductive portion 311 is displaced by the internal pressure of the battery cell 100, the first blocking member 80 can constrain the second conductive portion 311.

[0135] In some embodiments, the first blocking member 80 may be made of a non-metallic or metallic material. For example, the first blocking member 80 may be made of a metallic material, including but not limited to aluminum, copper, iron, steel, alloys, or composite metals. When the first blocking member 80 is made of a metallic material, an insulating structure may be provided between the second conductive part 311 and the first blocking member 80 to isolate the second conductive part 311 and the first blocking member 80, thereby reducing the risk of the first conductive part 31 being electrically connected to the first wall 12 through the first blocking member 80. Alternatively, the first blocking member 80 may be made of a non-metallic material, such as plastic. Alternatively, in some embodiments, the first blocking member 80 may include a metal body, the outer surface of which may be provided with an insulating structure to isolate the second conductive part 311 from the metal body.

[0136] In the above solution, by setting at least a portion of the first blocking member 80 to the side where the second conductive part 311 is away from the first deformable member 33, the second conductive part 311 can be constrained to suppress the offset of the second conductive part 311 relative to the first deformable member 33. This reduces the risk that the second conductive part 311 will deviate from the first deformable member 33 due to the internal pressure of the battery cell 100, thus preventing the first deformable member 33 from contacting the second conductive part 311. As a result, when the battery cell 100 is subjected to abuse conditions such as overcharging, the first deformable member 33 can effectively contact the second conductive part 311 to achieve overcharge protection, which is beneficial to improving the reliability of the battery cell 100 and, in turn, to improving the reliability of the battery 1000.

[0137] According to some embodiments of this application, referring to FIG8, on the same projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the first blocking member 80 and the orthographic projection of the first deforming member 33 at least partially overlap.

[0138] In some embodiments, along the thickness direction z of the first wall, the orthographic projections of the first blocking member 80 and the first deformable member 33 projected onto the same projection plane at least partially overlap. For example, the first deformable member 33 is a flip-plate, with its central portion serving as a contact point with the second conductive portion 311. Along the thickness direction z of the first wall, the projection of the first blocking member 80 may partially fall on the central portion of the flip-plate.

[0139] In the above scheme, in the thickness direction z perpendicular to the first wall, by setting at least a portion of the first blocking member 80 to face at least a portion of the first deformable member 33, the portion of the second conductive part 311 facing the first deformable member 33 can be effectively constrained. This allows the first deformable member 33 to deform towards the second conductive part 311 under the internal pressure of the battery cell 100 during overcharging or other abuse conditions, so as to contact the second conductive part 311 constrained by the first blocking member 80. This effectively achieves overcharge protection, which is beneficial to improving the reliability of the battery cell 100, and further beneficial to improving the reliability of the battery 1000.

[0140] In some other embodiments of this application, the first blocking member 80 may be disposed on the side of the second conductive part 311 opposite to the first conductive part 310, along the thickness direction z of the first wall, and the projection of the first blocking member 80 may not fall on the middle part of the first deformable member 33.

[0141] According to some embodiments of this application, referring to FIG8, along the thickness direction z of the first wall, the first conductive portion 310 has a first surface 3100 facing away from the first wall 12, and the first blocking member 80 has a second surface 81 facing away from the second conductive portion 311. Along the direction from the inner side of the first wall 12 to the outer side of the first wall 12, the first surface 3100 extends beyond the second surface 81, or the first surface 3100 and the second surface 81 are flush.

[0142] The first surface 3100 may be the upper surface of the first conductive part 310, and an insulating structure may be provided between the lower surface of the first conductive part 310 and the first wall 12. In some embodiments, the first surface 3100 may be connected to an external busbar component, for example, the first surface 3100 may be welded to an external busbar component.

[0143] The second surface 81 can be the upper surface of the first blocking member 80, and the lower surface of the first blocking member 80 can face the second conductive part 311 so that when the second conductive part 311 is shifted away from the first deformable member 33 by the internal pressure of the battery cell 100, the first blocking member 80 can suppress the shift of the second conductive part 311.

[0144] In some embodiments, the first blocking member 80 does not protrude from the first surface 3100 of the first conductive portion 310. Optionally, the upper portion of the second conductive portion 311 is thinned, and the thinned area can accommodate the first blocking member 80 so that the first blocking member 80 does not protrude from the first surface 3100. Optionally, the first conductive portion 310 is thickened so that the first surface 3100 is above or flush with the second surface 81 of the first blocking member 80.

[0145] Optionally, a clearance groove is provided on the second conductive part 311, which can accommodate at least a portion of the first blocking member 80 so that the first blocking member 80 does not protrude from the first surface 3100.

[0146] In the above solution, by setting the second surface 81 of the first blocking member 80 to not exceed the first surface 3100 of the first conductive part 310, the risk of interference between the external busbar connected to the first conductive part 310 and the first blocking member 80 can be reduced, the assembly difficulty of the battery 1000 can be reduced, the compactness of the battery 1000 structure can be improved, and the battery 1000 can have a high volumetric energy density.

[0147] In other embodiments, the second surface 81 may extend beyond the first surface 3100, for example by modifying the structure of the external busbar component so that the busbar component can avoid the first obstruction 80.

[0148] According to some embodiments of this application, the strength of the first conductive part 310 is greater than the strength of the second conductive part 311.

[0149] Strength can represent the mechanical properties of a material to resist fracture and excessive deformation. "The strength of the first conductive part 310 is greater than the strength of the second conductive part 311" can be understood as the second conductive part 311 being more easily deformed than the first conductive part 310, or it can be understood as the remaining force causing the second conductive part 311 to deform relative to the first conductive part 310 when the constraint force provided by the first blocking member 80 to the second conductive part 311 is greater than the force applied by the second conductive part 311 to the first blocking member 80.

[0150] In some embodiments, the first conductive part 310 may be made of a material with high strength, and the second conductive part 311 may be made of a material with low strength.

[0151] In some embodiments, the materials of the first conductive part 310 and the second conductive part 311 are adjusted so that the strength of the first conductive part 310 is greater than that of the second conductive part 311. For example, the first conductive part 310 and the second conductive part 311 are made of aluminum alloy. The strength of the first conductive part 310 and the second conductive part 311 is adjusted by adjusting the content of elements such as copper, magnesium, manganese, zinc and silicon in the aluminum alloy.

[0152] Alternatively, in some embodiments, the strength of the first conductive portion 310 and the second conductive portion 311 can be adjusted by different heat treatments, cold workings, surface treatments, etc. For example, the thickness of the second conductive portion 311 can be reduced so that the strength of the second conductive portion 311 is less than that of the first conductive portion 311.

[0153] In the above scheme, the strength of the first conductive part 310 is set to be relatively large, and the strength of the second conductive part 311 is set to be relatively small. On the one hand, this allows the first conductive part 310 to be effectively connected to the first terminal 32, ensuring the stability of power input and output to a certain extent, which is beneficial to improving the reliability of the battery 1000. On the other hand, it makes the second conductive part 311 easier to deform. When the internal pressure of the battery cell 100 acts on the first conductive part 31, the second conductive part 311 is constrained by the first blocking member 80 and deforms to fit tightly against the first wall 12. Thus, the first deformable member 33 can effectively contact the second conductive part 311 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and thus improving the reliability of the battery 1000.

[0154] According to some embodiments of this application, please refer to Figures 10 and 11. Figure 10 is a perspective view of the first conductive element 31 in some embodiments of this application, and Figure 11 is a side view of the first conductive element 31 in some embodiments of this application. Along the thickness direction z of the first wall, the thickness of the second conductive portion 311 is less than the thickness of the first conductive portion 310.

[0155] In some embodiments, the thickness of the first conductive portion 310 may be greater than the thickness of the second conductive portion 311. Optionally, the first conductive portion 310 and the second conductive portion 311 are integrally cast, and the thickness of the first conductive portion 310 is made greater than the thickness of the second conductive portion 311 by designing the casting mold. Optionally, the thickness of the second conductive portion 311 is reduced by cold rolling, cold pressing, or other processes, so that the thickness of the second conductive portion 311 is less than the thickness of the first conductive portion 310. Optionally, part of the material of the second conductive portion 311 is removed by processes such as turning, so that the thickness of the second conductive portion 311 is less than the thickness of the first conductive portion 310.

[0156] For example, referring to FIG10, the upper surface of the first conductive portion 310 may be above the upper surface of the second conductive portion 311. In some other embodiments, the upper surface of the first conductive portion 310 may be flush with the upper surface of the second conductive portion 311, and the lower surface of the first conductive portion 310 may be above the upper surface of the second conductive portion 311. In some other embodiments, the upper surface of the first conductive portion 310 may be above the upper surface of the second conductive portion 311, and the lower surface of the first conductive portion 310 may be above the upper surface of the second conductive portion 311.

[0157] In the above solution, by reducing the thickness of the second conductive part 311, the strength of the second conductive part 311 can be effectively reduced, so that the first blocking member 80 can effectively constrain the second conductive part 311, so that the second conductive part 311 is in close contact with the first wall 12, thereby the first deformable member 33 can effectively contact the second conductive part 311 to achieve overcharge protection, thereby improving the reliability of the battery cell 100, and further improving the reliability of the battery 1000.

[0158] In some embodiments, the size of the first conductive portion 310 along the second direction y can be larger than the size of the second conductive portion 311. In some embodiments, setting the size of the second conductive portion 311 along the second direction y to be smaller than the size of the first conductive portion 310 can make the strength of the second conductive portion 311 less than the strength of the first conductive portion 310, so that the second conductive portion 311 is more easily deformed than the first conductive portion 310.

[0159] According to some embodiments of this application, please refer to FIG11, along the thickness direction z of the first wall, the thickness of the second conductive part 311 is greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0160] In Figure 11, the thickness H1 of the second conductive part 311 is marked. Along the thickness direction z of the first wall, the thickness H1 of the second conductive part 311 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm...2.9mm, 3.0mm, or any value between two adjacent values.

[0161] In the above scheme, by setting the thickness of the second conductive part 311 to be greater than or equal to 0.5 mm, the overcurrent capacity of the first conductive element 31 can be guaranteed to a certain extent, reducing the risk of overcharge protection failure caused by the large current generated by the contact between the first deformable element 33 and the second conductive part 311 melting the first conductive element 31. This is beneficial to improving the reliability of the battery cell 100 and the battery 1000. By setting the thickness of the second conductive part 311 to be less than or equal to 3.0 mm, the strength of the second conductive part 311 is reduced, which is beneficial to improving the constraint effect of the first blocking element 80 on the second conductive part 311. This allows the second conductive part 311 to be tightly attached to the first wall 12 so as to effectively contact the first deformable element 33 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and the battery 1000. Therefore, by setting the thickness of the second conductive part 311 to be greater than or equal to 0.5 mm and less than or equal to 3 mm, it is possible to balance the overcurrent capacity of the first conductive part 31 with the reliability of overcharge protection, thereby improving the reliability of the battery 1000.

[0162] In some other embodiments, the thickness of the second conductive portion 311 may be less than 0.5 mm or greater than 3.0 mm. For example, the thickness of the second conductive portion 311 may be adjusted according to changes in the manufacturing material of the second conductive portion 311 or the specifications of the battery cell 100, so that the thickness of the second conductive portion 311 may be less than 0.5 mm or greater than 3.0 mm.

[0163] According to some embodiments of this application, along the thickness direction z of the first wall, the thickness of the second conductive portion 311 is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

[0164] In Figure 11, the thickness H1 of the second conductive part 311 is marked. Along the thickness direction z of the first wall, the thickness H1 of the second conductive part 311 can be 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm or any value between two adjacent values.

[0165] In the above scheme, by setting the thickness of the second conductive part 311 to be greater than or equal to 1.0 mm, the overcurrent capacity of the first conductive element 31 can be guaranteed to a certain extent. This effectively reduces the risk of overcharge protection failure caused by the large current generated when the first deformable element 33 contacts the second conductive part 311, which melts the first conductive element 31. This is beneficial to improving the reliability of the battery cell 100 and the battery 1000. By setting the thickness of the second conductive part 311 to be less than or equal to 2.0 mm, the strength of the second conductive part 311 is reduced, allowing the first blocking element 80 to effectively constrain the second conductive part 311. This ensures that the second conductive part 311 is in close contact with the first wall 12 and can effectively contact the first deformable element 33, thereby realizing the overcharge protection function of the battery cell 100, improving the reliability of the battery cell 100, and thus improving the reliability of the battery 1000. Therefore, by setting the thickness of the second conductive part 311 to be greater than or equal to 1.0 mm and less than or equal to 2.0 mm, the overcurrent capacity of the first conductive part 31 and the reliability of overcharge protection can be effectively balanced, thereby improving the reliability of the battery 1000.

[0166] According to some embodiments of this application, along the thickness direction z of the first wall, the first conductive portion 310 has a first surface 3100 facing away from the first wall 12, and the second conductive portion 311 has a third surface 3110 facing away from the first wall 12. Along the direction from the inside to the outside of the first wall 12, the first surface 3100 protrudes from the third surface 3110 by an amount greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0167] The first surface 3100 is the surface of the first conductive part 310 that is away from the first wall 12. The first surface 3100 can be the upper surface of the first conductive part 310. The third surface 3110 is the surface of the second conductive part 311 that is away from the first wall 12. The third surface 3110 can be the upper surface of the second conductive part 311. In some embodiments, the third surface 3110 can contact the first blocking member 80.

[0168] In Figure 11, the dimension H2 of the first surface 3100 protruding from the third surface 3110 is marked. "The dimension of the first surface 3100 protruding from the third surface 3110 in the direction from the inside to the outside of the first wall 12" can be understood as the distance between the first surface 3100 and the third surface 3110. This distance can be understood as being able to accommodate the first blocking member 80 of a corresponding thickness; for example, the thickness of the first blocking member 80 can be less than or equal to the value of H2.

[0169] The value of H2 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm…2.9mm, 3.0mm, or any value between two adjacent values.

[0170] In the above solution, by setting the first conductive part 310 to protrude from the second conductive part 311, and the protrusion size is greater than or equal to 0.5 mm and less than or equal to 3.0 mm, sufficient space can be reserved for the first blocking member 80. On the one hand, the first blocking member 80 can effectively constrain the second conductive part 311, so that the second conductive part 311 can effectively contact the first deformable member 33 to achieve overcharge protection, which is beneficial to improving the reliability of the battery 1000. On the other hand, it can reduce the interference of the first blocking member 80 on the external busbar component, which is beneficial to improving the volumetric energy density of the battery 1000.

[0171] In some other embodiments, the value of the dimension H2 by which the first surface 3100 protrudes from the third surface 3110 can be less than 0.5 mm or greater than 3.0 mm. For example, the dimension H2 by which the first surface 3100 protrudes from the third surface 3110 can be adjusted according to the change in the thickness of the first blocking member 80, so that the value of the dimension H2 by which the first surface 3100 protrudes from the third surface 3110 can be less than 0.5 mm or greater than 3.0 mm.

[0172] According to some embodiments of this application, the first surface 3100 protrudes from the third surface 3110 by a dimension greater than or equal to 1.0 mm and less than or equal to 1.5 mm in the direction from the inner side of the first wall 12 to the outer side of the first wall 12.

[0173] In Figure 11, the dimension H2 of the first surface 3100 protruding from the third surface 3110 is marked. The value of H2 can be 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or any value between two adjacent values.

[0174] In the above solution, by making the first conductive part 310 protrude from the second conductive part 311 by a size greater than or equal to 1.0 mm and less than or equal to 1.5 mm, sufficient space can be effectively reserved for the first blocking member 80. On the one hand, the first blocking member 80 can effectively constrain the second conductive part 311, so that the second conductive part 311 can effectively contact the first deformable member 33 to achieve overcharge protection, which is beneficial to improving the reliability of the battery 1000. On the other hand, it can reduce the interference of the first blocking member 80 on the external busbar component, which is beneficial to improving the volumetric energy density of the battery 1000.

[0175] According to some embodiments of this application, please refer to Figures 10 and 11. The first conductive element 31 further includes a weak portion 312, which is disposed between the first conductive portion 310 and the second conductive portion 311.

[0176] The weak portion 312 is a part located between the first conductive portion 310 and the second conductive portion 311. The weak portion 312 can be understood as a part that, when the first conductive portion 310 and the second conductive portion 311 are subjected to force, can bend or deform along the location of the weak portion 312.

[0177] In some embodiments, the strength of the first conductive portion 310 is greater than the strength of the weak portion 312, and the strength of the second conductive portion 311 is greater than the strength of the weak portion 312.

[0178] Optionally, by providing a stress groove between the first conductive portion 310 and the second conductive portion 311, a weak portion 312 can be formed between the first conductive portion 310 and the second conductive portion 311. Optionally, by providing a structure such as a notch or a perforation between the first conductive portion 310 and the second conductive portion 311 to reduce the structural strength of the first conductive member 31, a weak portion 312 can be formed between the first conductive portion 310 and the second conductive portion 311.

[0179] In the above solution, by providing a weak portion 312 between the first conductive portion 310 and the second conductive portion 311, the second conductive portion 311 deforms relative to the first conductive portion 310 along the weak portion 312 under the pressure inside the battery cell 100 and the constraint of the first blocking member 80. This allows the second conductive portion 311 to contact the first deformable member 33 under the constraint of the first blocking member 80 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and, consequently, the reliability of the battery 1000.

[0180] According to some embodiments of this application, please refer to Figures 10 and 11. A first groove 3120 is provided on one side of the first conductive member 31 along the thickness direction z of the first wall. The part of the first conductive member 31 corresponding to the first groove 3120 is a weak part 312.

[0181] In some embodiments, the first groove 3120 may be a through groove penetrating both ends of the first conductive member 31, or it may be a blind hole structure that does not penetrate both ends of the first conductive member 31. For example, the first groove 3120 may extend along the second direction y and penetrate the two end faces of the first conductive member 31 that are opposite to each other in the second direction y, and the second direction y may be perpendicular to the first direction x and perpendicular to the thickness direction z of the first wall.

[0182] By creating a first groove 3120 on the surface of the first conductive element 31, the local strength of the first conductive element 31 is reduced to form a weak part 312.

[0183] Optionally, the first groove 3120 is formed on the surface of the first conductive member 31 facing away from the first wall 12. Optionally, the first groove 3120 is formed on the surface of the first conductive member 31 facing the first wall 12.

[0184] Optionally, the first conductive element 31 is manufactured using an integral molding process. The first groove 3120 is formed by adjusting the manufacturing mold or parameters. For example, the casting mold is designed so that the surface of the first conductive element 31 has the first groove 3120. Optionally, the first groove 3120 is formed on the first conductive element 31 by cold rolling, cold pressing, or other processes. Optionally, a portion of the material of the first conductive element 31 is removed by processes such as turning to form the first groove 3120.

[0185] In the above solution, by providing a first groove 3120 on one side of the first conductive member 31 as a stress groove, on the one hand, the stress concentration caused by the internal pressure of the battery cell 100 and the constraint of the first blocking member 80 on the first conductive member 31 is reduced, thereby reducing the risk of the first conductive member 31 breaking; on the other hand, it is beneficial for the second conductive part 311 to deform under the constraint of the first blocking member 80 and to contact the first deformable part 33, so as to effectively trigger the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell 100, thereby making the battery cell 100 highly reliable, and thus making the battery 1000 highly reliable.

[0186] According to some embodiments of this application, along the thickness direction z of the first wall, the depth of the first groove 3120 is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0187] In Figure 11, the depth H3 of the first groove 3120 is marked. The value of the depth H3 of the first groove 3120 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm or any value between two adjacent values.

[0188] In the above scheme, by setting the depth of the first groove 3120 to be greater than or equal to 0.1 mm, the second conductive part 311 can deform under the constraint of the first blocking member 80 and come into contact with the first deformable member 33, so as to effectively trigger the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell 100, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high. Setting the depth of the first groove 3120 to be less than or equal to 2.0 mm can, to a certain extent, ensure the overcurrent capacity of the first conductive member 31, reduce the risk of the first conductive member 31 being melted by a large current and causing the overcharge protection to fail, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high.

[0189] In some other embodiments, the depth H3 of the first groove 3120 can be less than 0.5 mm or greater than 2.0 mm. For example, the depth of the first groove 3120 can be adjusted according to changes in the manufacturing material of the first conductive element 31 or the maximum thickness of the first conductive element 31, so that the depth H3 of the first groove 3120 can be less than 0.5 mm or greater than 2.0 mm.

[0190] According to some embodiments of this application, along the thickness direction z of the first wall, the depth of the first groove 3120 is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0191] In Figure 11, the depth H3 of the first groove 3120 is marked. The depth H3 of the first groove 3120 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm or any value between two adjacent values.

[0192] In the above scheme, by setting the depth of the first groove 3120 to be greater than or equal to 0.5mm, the second conductive part 311 can be effectively deformed under the constraint of the first blocking member 80 and can contact the first deformable member 33, so as to effectively trigger the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell 100, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high. Setting the depth of the first groove 3120 to be less than or equal to 1mm can ensure the overcurrent capacity of the first conductive member 31 to a certain extent, effectively reducing the risk of the first conductive member 31 being melted by a large current and causing the overcharge protection to fail, thus making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high.

[0193] According to some embodiments of this application, along the first direction x, the maximum width of the first groove 3120 is greater than or equal to 0.1 mm and less than or equal to 3.0 mm.

[0194] In Figure 11, the maximum width L1 of the first groove 3120 is marked. The maximum width L1 of the first groove 3120 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm…2.9mm, 3.0mm or any value between two adjacent values.

[0195] In the above scheme, by setting the maximum width of the first groove 3120 to be greater than or equal to 0.1 mm, the second conductive part 311 can deform under the constraint of the first blocking member 80 and come into contact with the first deformable member 33, so as to effectively trigger the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell 100, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high. Setting the width of the first groove 3120 to be less than or equal to 3 mm can, to a certain extent, ensure the overcurrent capacity of the first conductive member 31, reduce the risk of the first conductive member 31 being melted by a large current and causing the overcharge protection to fail, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high.

[0196] In some other embodiments, the maximum width L1 of the first groove 3120 can be less than 0.1 mm or greater than 3.0 mm. For example, the maximum width L1 of the first groove 3120 can be adjusted according to changes in the manufacturing material of the first conductive element 31 or the specification of the maximum thickness of the first conductive element 31, so that the maximum width L1 of the first groove 3120 can be less than 0.1 mm or greater than 3.0 mm.

[0197] According to some embodiments of this application, along the first direction x, the maximum width of the first groove 3120 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0198] In Figure 11, the maximum width L1 of the first groove 3120 is marked. The maximum width L1 of the first groove 3120 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or any value between two adjacent values.

[0199] In the above scheme, by setting the width of the first groove 3120 to be greater than or equal to 0.5 mm, the second conductive part 311 can be effectively deformed under the constraint of the first blocking member 80 and can contact the first deformable member 33, so as to effectively trigger the overcharge protection mechanism under abuse conditions such as overcharging of the battery cell 100, thereby making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high. Setting the width of the first groove 3120 to be less than or equal to 1.5 mm can ensure the overcurrent capacity of the first conductive member 31 to a certain extent, effectively reducing the risk of the first conductive member 31 being melted by a large current and causing the overcharge protection to fail, thus making the reliability of the battery cell 100 high, and thus making the reliability of the battery 1000 high.

[0200] According to some embodiments of this application, please refer to Figures 5 and 6. The first blocking member 80 is connected to the first wall 12 at its two opposite ends along the second direction y. The second direction y, the first direction x, and the thickness direction z of the first wall are perpendicular to each other.

[0201] In some embodiments, the first conductive element 31 is generally rectangular, the first direction x is the arrangement direction of the first conductive portion 310 and the second conductive portion 311, the first direction x is parallel to the length direction of the first conductive element 31, the second direction y is perpendicular to the first direction x, and the second direction y may be parallel to the width direction of the first conductive element 31.

[0202] In some embodiments, along the thickness direction z of the first wall, the projection of the first blocking member 80 onto the first wall 12 can be generally rectangular and spans the second conductive portion 311. Along the second direction y, one end of the first blocking member 80 is connected to the first wall 12, the main body of the first blocking portion is located on the side of the second conductive portion 311 opposite to the first wall 12, and the other end of the first blocking portion is connected to the first wall 12.

[0203] In the above scheme, the first blocking member 80 is disposed on the first wall 12 along the second direction y so that it can cross the second conductive part 311 in the second direction y, occupying less space in the thickness direction of the first wall 12 and effectively constraining the second conductive part 311 to suppress the second conductive part 311 from shifting in the direction away from the first deformable member 33. When the battery cell 100 is in an abuse condition such as overcharging, the first deformable member 33 can effectively contact the second conductive part 311 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and thus improving the reliability of the battery 1000.

[0204] In other embodiments, the first blocking member 80 may have other shapes, and the portion where the first blocking member 80 connects to the first wall 12 may be other portions. For example, the connection position between the first blocking member 80 and the first wall 12 may include the side of the second conductive portion 311 opposite to the first conductive portion 310 along the first direction x, the side of the second conductive portion 311 along the second direction y, and / or the other side of the second conductive portion 311 along the second direction y.

[0205] According to some embodiments of this application, please refer to Figures 8, 9, and 12. Figure 12 is a schematic diagram of a partial structure of the first insulating member 50 and the first wall 12 in some embodiments of this application. The battery cell 100 also includes the first insulating member 50, at least a portion of which is disposed between the first conductive member 31 and the first wall 12 for insulating and isolating the first conductive member 31 and the first wall 12.

[0206] The first insulating element 50 is an insulating structure located at least partially between the first conductive element 31 and the first wall 12. The first insulating element 50 may be the first insulating structure described above.

[0207] The first insulating member 50 is used to insulate and isolate the first conductive member 31 and the first wall 12. In some embodiments, a portion of the first insulating member 50 may be between the inner side of the first conductive member 31 and the first wall 12, and another portion of the first insulating member 50 may cover at least a portion of the outer peripheral surface of the first conductive member 31.

[0208] Referring to Figure 12, the first insulating member 50 may have a first through hole 52 and a second through hole 53. The first through hole 52 may correspond to the first through hole 120, through which the first pole post 32 passes. The second through hole 53 may correspond to the second through hole 121, through which the first deformable member 33 passes to contact the second conductive part 311.

[0209] In the above solution, by providing a first insulating member 50 between the first conductive member 31 and the first wall 12, the risk of the first conductive member 31 directly contacting the first wall 12 and causing a short circuit inside the battery cell 100 can be reduced, thereby making the battery cell 100 have higher reliability, and thus making the battery 1000 have higher reliability.

[0210] According to some embodiments of this application, please refer to Figures 8, 9 and 12. A second groove 124 is formed on the outer surface of the first wall 12, a first conductive member 31 is disposed in the second groove 124, and at least a portion of the first insulating member 50 is disposed in the second groove 124.

[0211] The outer surface of the first wall 12 can be defined as along the thickness direction z of the first wall, and the first wall 12 is away from the surface of the electrode assembly 20. The second groove 124 is a groove-shaped structure formed on the outer surface of the first wall 12. The first through hole 120 and the second through hole 121 are formed at the bottom of the groove 124. The first insulating member 50 is located in the second groove 124 and the outer peripheral surface of the first insulating member 50 is in contact with the groove sidewall of the second groove 124. In some embodiments, a portion of the outer peripheral surface of the first insulating member 50 is in contact with the groove sidewall of the second groove 124, and another portion protrudes from the second groove 124.

[0212] Optionally, the outer surface of the first wall 12 can be formed into the second groove 124 by processes such as extrusion, stamping, or turning. Optionally, the first wall 12 can be integrally formed by processes such as casting, and the second groove 124 can be formed along with the integral forming process.

[0213] For example, referring to Figure 12, a protrusion is formed on the outer surface of the first wall 12. The protrusion has an annular structure and surrounds the second groove 124. The outer peripheral surface of the first insulating member 50 is in contact with the inner surface of the protrusion.

[0214] In the above scheme, by setting the second groove 124, the first conductive component 31 and the first insulating component 50 can be assembled and positioned relative to the first wall 12, reducing the assembly difficulty of the first conductive component 31 and the first insulating component 50, so that the battery cell 100 has a higher manufacturing efficiency, and thus the battery 1000 has a higher manufacturing efficiency.

[0215] According to some embodiments of this application, please refer to Figures 6 and 12. The second groove 124 includes two first groove sidewalls that are opposite to each other along the second direction y. At least one first groove sidewall is formed with a first positioning groove 1240. One end of the first blocking member 80 along the second direction y is disposed in the first positioning groove 1240.

[0216] The shape of the second groove 124 can correspond to the shape of the first insulating member 50. Exemplarily, the second groove 124 is generally a rectangular groove, and in the second direction y, the second groove 124 has two opposing first groove sidewalls. In some embodiments, one of the two first groove sidewalls forms a first positioning groove 1240, which is notched and can accommodate at least a portion of the end of the first blocking member 80 along the second direction y. In some embodiments, the two first groove sidewalls each form a first positioning groove 1240, which is notched, and both ends of the first blocking member 80 along the second direction y are respectively disposed in the corresponding first positioning groove 1240.

[0217] In some embodiments, the first positioning groove 1240 is elongated, and the length direction of the first positioning groove 1240 is the first direction x.

[0218] Optionally, the end of the first blocking member 80 along the second direction y can be connected to the sidewall of the first positioning groove 1240, for example, by welding it to the sidewall of the first positioning groove 1240 along the second direction y. Optionally, the end of the first blocking member 80 along the second direction y can be connected to the bottom wall of the first positioning groove 1240, for example, the bottom wall of the first positioning groove 1240 and the bottom wall of the second groove 124 are at the same location, and the first blocking member 80 is welded to the bottom wall of the groove.

[0219] In the above scheme, by setting a first positioning groove 1240 on the groove sidewall of the second groove 124, the end of the first blocking member 80 is positioned on the first wall 12, thereby improving the assembly accuracy of the first blocking member 80 and reducing the assembly difficulty of the first blocking member 80, which is conducive to improving the manufacturing efficiency of the battery cell 100, and further conducive to improving the manufacturing efficiency of the battery 1000.

[0220] According to some embodiments of this application, please refer to FIG12. A first clearance groove 51 is formed on at least one side of the first insulating member 50 along the second direction y. The first positioning groove 1240 corresponds to the position of the first clearance groove 51. The first clearance groove 51 is used to avoid the first blocking member 80.

[0221] The first clearance groove 51 is a groove-shaped structure formed on the outer periphery of the first insulating member 50. Corresponding to the first clearance groove 51, a portion of the end of the first blocking member 80 along the second direction y is disposed in the first positioning groove 1240, and the other portion is accommodated in the first clearance groove 51. Optionally, the second groove 124 has first positioning grooves 1240 formed on both sides along the second direction y, and correspondingly, the first insulating member 50 has first clearance grooves 51 formed on both sides along the second direction y, with the first clearance grooves 51 and the first positioning grooves 1240 corresponding one-to-one.

[0222] Optionally, the width of the first clearance groove 51 corresponds to the width of the first positioning groove 1240, for example, the two have the same dimensions. The width of the first clearance groove 51 and the width of the first positioning groove 1240 can be equal to or slightly greater than the width of the portion of the first blocking member 80 located in the first clearance groove 51 and the first positioning groove 1240.

[0223] For example, referring to Figures 10 and 12, the size of the second conductive portion 311 is smaller than the size of the first conductive portion 310 along the second direction y. The first insulating member 50 includes a bottom wall and a side wall disposed on the outer side of the bottom wall. Along the circumference of the first conductive member 31, the side wall has an annular structure and contacts the outer peripheral surfaces of the first conductive portion 310 and the second conductive portion 311. The portion of the side wall that contacts the outer peripheral surface of the second conductive portion 311 is recessed inward than the portion of the side wall that contacts the outer peripheral surface of the second conductive portion 311, and a first clearance groove 51 is formed on the bottom wall corresponding to this portion.

[0224] In the above solution, by providing a first clearance groove 51 on the first insulating member 50 to correspond to the first positioning groove 1240, the risk of interference between the first insulating member 50 and the first blocking member 80, resulting in damage to the first insulating member 50 or the first blocking member 80 failing to restrain the second conductive part 311, can be reduced, thereby making the battery cell 100 have higher reliability, and thus making the battery 1000 have higher reliability.

[0225] According to some embodiments of this application, please refer to Figures 9 and 13. Figure 13 is a schematic structural diagram of the first blocking member 80 in some embodiments of this application. The first blocking member 80 includes a first top wall 82, a first side wall 83, and a second side wall 84. The first side wall 83 and the second side wall 84 are spaced apart along a second direction y, and the first top wall 82 connects the first side wall 83 and the second side wall 84. At least a portion of the second conductive part 311 is located between the first side wall 83 and the second side wall 84, and the first top wall 82 is located on the side of the second conductive part 311 opposite to the first deformable member 33. The second direction y, the first direction x, and the thickness direction z of the first wall are all perpendicular to each other.

[0226] In some embodiments, the first blocking member 80 may be generally arched, the first sidewall 83 is inclinedly disposed on the first top wall 82, the second sidewall 84 is inclinedly disposed on the first top wall 82, the first top wall 82 may contact the outer surface of the second conductive part 311, and the first sidewall 83 and the second sidewall 84 may be located on both sides of the second conductive part 311 along the second direction y.

[0227] Optionally, the first sidewall 83 and the first topwall 82 may be connected in an arc-shaped transition, and the second sidewall 84 and the first topwall 82 may be connected in an arc-shaped transition.

[0228] In some embodiments, a portion of the sidewall of the first insulating member 50 may cover at least a portion of the outer peripheral surface of the second conductive portion 311, and the portion of the sidewall of the first insulating member 50 may be located between the first sidewall 83 and the second sidewall 84.

[0229] In the above scheme, the first blocking member 80 has a simple structure. The first side wall 83, the first top wall 82 and the second side wall 84 can form an arched structure so that the second conductive part 311 can be constrained by the first top wall 82 to suppress the second conductive part 311 from shifting in the direction away from the first deformable member 33, so that the first deformable member 33 can contact the second conductive part 311 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and thus improving the reliability of the battery 1000.

[0230] In other embodiments, the outer surface of the first wall 12 may have a protrusion, the second conductive part 311 is located below the protrusion, the first blocking member 80 may be flat, and the two ends of the first blocking member 80 along the second direction y may be connected to the protrusion and contact the outer surface of the second conductive part 311.

[0231] According to some embodiments of this application, the first blocking member 80 further includes a first flange 85 and a second flange 86. The first flange 85 is connected to the end of the first side wall 83 opposite to the first top wall 82, and the second flange 86 is connected to the end of the second side wall 84 opposite to the first top wall 82. The first flange 85 and the second flange 86 are respectively connected to the first wall 12.

[0232] In some embodiments, a first flange 85 is formed at the end of the first sidewall 83 opposite to the first top wall 82. Along the thickness direction z of the first wall, the two opposing surfaces of the first flange 85 are flat surfaces, one of which is supported by the first wall 12. A second flange 86 is formed at the end of the second sidewall 84 opposite to the first top wall 82. Along the thickness direction z of the first wall, the two opposing surfaces of the second flange 86 are flat surfaces, one of which is supported by the first wall 12.

[0233] In some embodiments, the two first groove sidewalls of the second groove 124 that are opposite to each other along the second direction y are respectively formed with first positioning grooves 1240, the two sides of the first insulating member 50 are respectively formed with first clearance grooves 51, the end of the first flange 85 is disposed in one of the first positioning grooves 1240 and the first flange 85 is located between one of the first positioning grooves 1240 and the first clearance groove 51, and the end of the second flange 86 is disposed in another first positioning groove 1240 and the second flange 86 is located between the other first positioning groove 1240 and the first clearance groove 51.

[0234] In the above scheme, by setting the first flange 85 and the second flange 86, the first blocking member 80 and the first wall 12 can have a large connection area, thereby enabling the first blocking member 80 and the first wall 12 to have a stable connection relationship, which can effectively constrain the second conductive part 311, so that the first deformable member 33 can contact the second conductive part 311 to achieve overcharge protection, thereby improving the reliability of the battery cell 100 and further improving the reliability of the battery 1000.

[0235] According to some embodiments of this application, please refer to FIG13, a second insulating member 87 is provided on the side of the first blocking member 80 facing away from the first wall 12. The second insulating member 87 is used to insulate and isolate the first blocking member 80 from the external busbar component, and / or a third insulating member 88 is provided on the side of the first blocking member 80 facing the first wall 12. The third insulating member 88 is used to insulate and isolate the first blocking member 80 and the second conductive part 311.

[0236] In some embodiments, the first blocking member 80 includes a metal core, the material of which may include aluminum, copper, iron, steel, alloy, or composite metal. The metal core can be connected to the first wall 12 by welding. A second insulating member 87 may be provided on the side of the metal core facing away from the first wall 12. A third insulating member 88 may therefore be provided on the side of the metal core facing the first wall 12. The second insulating member 87 and the third insulating member 88 may be made of insulating materials, such as organic insulating materials, inorganic insulating materials, or mixed insulating materials. Exemplarily, the second insulating member 87 and the third insulating member 88 are plastic. Exemplarily, in some embodiments of this application, the manufacturing materials of the second insulating member 87 and the third insulating member 88 include, but are limited to, other materials with insulating properties such as polyphenylene sulfide, polypropylene, and polyethylene.

[0237] Optionally, the second insulating member 87 can be attached to the metal inner core by means of bonding, hot pressing, snap-fitting, etc. The third insulating member 88 can be attached to the metal inner core by means of bonding, hot pressing, snap-fitting, etc.

[0238] Optionally, the second insulating member 87 and the third insulating member 88 can be an integral structure and are cylindrical. The second insulating member 87 and the third insulating member 88 can be sleeved on the outer periphery of the metal inner core.

[0239] In the above solution, by providing a second insulating member 87 on the first blocking member 80, the first blocking member 80 and the external busbar can be effectively insulated and isolated to reduce the internal resistance of the battery 1000 and improve the charging and discharging performance of the battery 1000. By providing a third insulating member 88 on the first blocking member 80, the first blocking member 80 and the second conductive part 311 can be effectively insulated and isolated, reducing the risk of internal short circuit in the battery cell 100 caused by electrical connection between the first wall 12 and the first conductive part 31, thus making the battery cell 100 have higher reliability, and consequently making the battery 1000 have higher reliability.

[0240] According to some embodiments of this application, please refer to FIG13. Along the thickness direction z of the first wall, the thickness of the second insulating member 87 is not less than 0.4 mm and not more than 0.8 mm. Along the thickness direction z of the first wall, the thickness of the third insulating member 88 is not less than 0.4 mm and not more than 0.8 mm.

[0241] The thickness W1 of the second insulating element 87 is marked in Figure 13. The thickness W1 of the second insulating element 87 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or any value between two adjacent values.

[0242] The thickness W2 of the third insulating component 88 is marked in Figure 13. The thickness W2 of the third insulating component 88 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or any value between two adjacent values.

[0243] In the above solution, by limiting the thickness of the second insulating member 87 to not less than 0.4 mm and not more than 0.8 mm, the insulation between the first blocking member 80 and the external current-carrying component can be balanced, while reducing the space occupied by the second insulating member 87 inside the battery 1000. By limiting the thickness of the third insulating member 88 to not less than 0.4 mm and not more than 0.8 mm, the insulation between the first wall 12 and the first conductive member 31 can be balanced, while reducing the space occupied by the third insulating member 88 inside the battery 1000, thus enabling the battery 1000 to have higher mass energy density and volumetric energy density.

[0244] In other embodiments, the thickness of the second insulating member 87 along the thickness direction z of the first wall can be less than 0.4 mm or greater than 0.8 mm. The thickness of the third insulating member 88 along the thickness direction z of the first wall can be less than 0.4 mm or greater than 0.8 mm. Exemplarily, in some embodiments, the thickness of the second insulating member 87 along the thickness direction z of the first wall can be 0.3 mm, 0.2 mm, or a smaller value. The thickness of the third insulating member 88 can be 0.3 mm, 0.2 mm, or a smaller value. Alternatively, in some embodiments, the thickness of the second insulating member 87 along the thickness direction z of the first wall can be 0.9 mm, 1.0 mm, or a larger value. The thickness of the third insulating member 88 can be 0.9 mm, 1.0 mm, or a larger value.

[0245] According to some embodiments of this application, the first blocking member 80, the second insulating member 87, and the third insulating member 88 are integrally formed.

[0246] In some embodiments, the first blocking member 80, the second insulating member 87, and the third insulating member 88 are manufactured using an injection molding process.

[0247] In the above scheme, the first blocking component 80, the second insulating component 87, and the third insulating component 88 are manufactured using an integrated molding process, which can improve the manufacturing efficiency of the first blocking component 80 and the assembly efficiency of the battery cell 100, thereby making the manufacturing efficiency of the battery 1000 high.

[0248] According to some embodiments of this application, please refer to Figures 4, 5, 6 and 14. Figure 14 is a schematic diagram of the first wall 12, the first deformable member 33, the second electrode terminal 40 and the second blocking member 90 in some embodiments of this application.

[0249] The battery cell 100 also includes a second conductive element 41, a second terminal 42, and a second deformable element 43. At least a portion of the second conductive element 41 is disposed on the outside of the first wall 12 and is insulated from the first wall 12. The second terminal 42 is connected to the second conductive element 41. The second deformable element 43 is electrically connected to the first wall 12 and is configured to deform to be electrically connected to the second conductive element 41, thereby electrically connecting the second terminal 42 to the first wall 12.

[0250] In some embodiments, the battery cell 100 further includes a second electrode terminal 40, which is electrically connected to the second tab 23 of the electrode assembly 20 for connection to an external busbar. The polarity of the second electrode terminal 40 is opposite to that of the first electrode terminal 30; for example, the first electrode terminal 30 is a positive electrode terminal, and the second electrode terminal 40 is a negative electrode terminal. The second electrode terminal 40 is used for electrical connection with the electrode assembly 20, allowing current to flow into or out of the second tab 23 via the second electrode terminal 40. In some embodiments, the second electrode terminal 40 is made of a metallic material, such as aluminum, copper, iron, steel, alloys, or composite metals. In some embodiments, the second electrode terminal 40 can be connected to the second tab 23 via a second adapter 24. Exemplarily, the second tab 23 of the electrode assembly 20 is composed of multiple stacked second sub-tabs, and one end of the second adapter 24 can be welded to the second tab 23, and then the other end of the second adapter 24 can be welded to the second electrode terminal 40.

[0251] The second electrode terminal 40 includes a second conductive element 41 and a second electrode post 42. At least a portion of the second conductive element 41 is located on the side of the first wall 12 opposite to the electrode assembly 20, and the second conductive element 41 is used to connect to an external busbar (e.g., a power strip). Exemplarily, the second conductive element 41 is welded to the busbar. The second electrode post 42 is connected to the second tab 23 of the electrode assembly 20, and exemplaryly, the second electrode post 42 is connected to the second tab 23 via a second adapter 24. The second conductive element 41 and the second electrode post 42 are interconnected, and the connection between the second conductive element 41 and the second electrode post 42 includes welding, riveting, threaded connection, or integral molding, etc. For example, in some embodiments, the second conductive element 41 and the second pole post 42 are riveted to each other. The second conductive element 41 is generally plate-shaped and has a riveting hole. The second pole post 42 is generally columnar, such as cylindrical or polygonal columnar. Part of the second pole post 42 passes through the first wall 12 and is riveted in the riveting hole, while the other part is located inside the housing 10 and connected to the second pole tab 23 through the second adapter 24.

[0252] In some embodiments, a third insulating structure 60 is provided between the second conductive element 41 and the first wall 12, and the third insulating structure 60 is used to insulate and isolate the second conductive element 41 from the first wall 12. A fourth insulating structure 61 is provided between the second pole post 42 and the first wall 12, and the fourth insulating structure 61 may be provided on the outer periphery of the second pole post 42.

[0253] In some embodiments, the third insulating structure 60 and / or the fourth insulating structure 61 can be made of materials with high resistivity, such as organic insulating materials, inorganic insulating materials, or mixed insulating materials. Exemplarily, in some embodiments of this application, the materials of the third insulating structure 60 and / or the fourth insulating structure 61 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the third insulating structure 60 and / or the fourth insulating structure 61 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0254] In some embodiments, the resistance value of the third insulating structure 60 and / or the fourth insulating structure 61 can be expressed in megaohms (MΩ). For example, in some embodiments of the battery cell 100 provided in this application, the resistance value of the third insulating structure 60 and / or the fourth insulating structure 61 can be greater than or equal to 200 MΩ.

[0255] The second deformable member 43 is mounted on the first wall 12 and is electrically connected to the first wall 12. In some embodiments, the second deformable member 43 may be made of a metallic material, such as copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, the second deformable member 43 may be welded to the inner surface of the first wall 12.

[0256] The second deformable member 43 is a structural component that deforms under the internal pressure of the battery cell 100. The second deformable member 43 is used for overcharge protection of the battery cell 100. For example, the first wall 12 has a third through hole 122 and a fourth through hole 123. The second electrode post 42 passes through the third through hole 122 and connects to the second conductive member 41. The second deformable member 43 closes the fourth through hole 123. When the internal pressure of the battery cell 100 reaches a certain level, the second deformable member 43 deforms to pass through the fourth through hole 123 and contact the second conductive member 41.

[0257] For example, when the battery cell 100 is subjected to abuse conditions such as overcharging, the internal pressure increases. When the internal pressure reaches a certain level, such as a second threshold, the second deformable member 43 deforms to contact the second conductive member 41, thereby connecting the first wall 12 and the second electrode terminal 40, and short-circuiting the positive and negative electrodes inside the battery cell 100. In some embodiments, the first threshold and the second threshold may be equal or unequal.

[0258] For example, when a battery cell 100 is in an abused condition due to overcharging, the internal pressure of the battery cell 100 increases. When the internal pressure of the battery cell 100 reaches a first threshold, the first deformable member 33 deforms, short-circuiting the first electrode terminal 30 and the outer casing 10. When the internal pressure of the battery cell 100 reaches a second threshold, the second deformable member 43 deforms, short-circuiting the second electrode terminal 40 and the outer casing 10. This causes the positive and negative terminals of the battery cell 100 to be short-circuited internally, creating an internal short circuit. The instantaneously generated large current can melt and break the electrical connection components inside the battery cell 100, cutting off the charging and discharging circuit of the battery cell 100, thereby providing overcharge protection. The melted electrical connection components may include the first adapter 22 and / or the second adapter 24.

[0259] In the above scheme, by setting the second deformable member 43, when the internal pressure of the battery cell 100 reaches a certain level, the deformation of the second deformable member 43 causes it to contact the second conductive member 41, thereby making the second terminal 42 electrically connected to the first wall 12. Combined with the contact between the first deformable member 33 and the first conductive member 31, the electrical connection components inside the battery cell 100 melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell 100. This provides overcharge protection and reduces the risk of thermal runaway of the battery cell 100, thereby giving the battery 1000 high reliability. In some embodiments, when the battery cell 100 is used in an energy storage device, by simultaneously setting the first deformable member 33 and the second deformable member 43, overcharge protection can be effectively achieved, meeting the high reliability requirements of the energy storage device.

[0260] According to some embodiments of this application, please refer to FIG14. The second conductive member 41 includes a third conductive portion 410 and a fourth conductive portion 411 arranged along a first direction x. The third conductive portion 410 is connected to the second terminal post 42, and the second deformable member 43 is used to contact the fourth conductive portion 411. The battery cell 100 also includes a second blocking member 90, which is connected to the first wall 12. At least a portion of the second blocking member 90 is located on the side of the fourth conductive portion 411 opposite to the second deformable member 43.

[0261] The second conductive element 41 includes a third conductive portion 410 and a fourth conductive portion 411 arranged along a first direction x, which is perpendicular to the thickness direction z of the first wall. A portion of the second electrode post 42 is located inside the housing 10. The end of the second electrode post 42 facing away from the electrode assembly 20 can pass through the first wall 12 and connect to the third conductive portion 410. The connection between the second electrode post 42 and the third conductive portion 410 includes, but is not limited to, welding, riveting, threaded connection, or other connection methods. The third conductive element is used to connect to the busbar component for the input and output of electrical energy. Exemplarily, the surface of the third conductive portion 410 facing away from the first wall 12 is welded to the busbar component. Exemplarily, the third conductive portion 410 has a riveting hole, and the first wall 12 has a third through hole 122. The end of the second electrode post 42 facing away from the electrode assembly 20 passes through the third through hole 122 and is riveted into the riveting hole. The surface of the third conductive portion 410 facing away from the first wall 12 is used for welding to a contact plate.

[0262] The fourth conductive part 411 is used to contact the second deformed part 43, and the fourth conductive part 411 closes the fourth through hole 123.

[0263] In some embodiments, the third conductive part 410 and the fourth conductive part 411 can be directly connected, or indirectly connected through other structural components, or the third conductive part 410 and the fourth conductive part 411 can be integrally formed.

[0264] In some embodiments, the third conductive part 410 and the fourth conductive part 411 may be made of the same or different materials. For example, both the third conductive part 410 and the fourth conductive part 411 may be made of aluminum, aluminum alloy, copper, copper alloy, stainless steel, or other metallic materials. For another example, the third conductive part 410 may be made of copper, and the fourth conductive part 411 may be made of aluminum.

[0265] The second blocking member 90 is connected to the first wall 12. In some embodiments, the second blocking member 90 may be directly or indirectly connected to the first wall 12. In some embodiments, the connection between the second blocking member 90 and the first wall 12 includes, but is not limited to, bonding, welding, snap-fitting, riveting, threaded connection, or other connection methods. Along the thickness direction z of the first wall, the shape of the projection of the second blocking member 90 onto the first wall 12 includes, but is not limited to, a strip shape, a square shape, a serpentine shape, a triangle shape, or other shapes.

[0266] "At least a portion of the second blocking member 90 is located on the side of the fourth conductive part 411 opposite to the second deformable member 43" can be understood as the orthographic projection of the second blocking member 90 and the orthographic projection of the fourth conductive part 411 at least partially overlapping, for example, partially overlapping or completely overlapping, on the same projection plane perpendicular to the thickness direction of the first wall 12.

[0267] The second blocking member 90 can be used to constrain the fourth conductive portion 411 and suppress its displacement in a direction away from the second deformable member 43. In some embodiments, the second blocking member 90 may be in contact with the fourth conductive portion 411, or the second blocking member 90 may abut against the fourth conductive portion 411 to press the fourth conductive portion 411 against the first wall 12. In other embodiments, along the thickness direction z of the first wall, the second blocking member 90 and the fourth conductive portion 411 are not in contact, and there is a small gap between the second blocking member 90 and the fourth conductive portion 411 so that the second blocking member 90 can constrain the fourth conductive portion 411 when it is displaced by the internal pressure of the battery cell 100.

[0268] In some embodiments, the material of the second blocking member 90 includes non-metallic or metallic materials. For example, the second blocking member 90 is made of metallic material, including but not limited to aluminum, copper, iron, steel, alloys, or composite metals. When the second blocking member 90 is made of metallic material, an insulating structure can be provided between the fourth conductive part 411 and the second blocking member 90 to isolate the fourth conductive part 411 and the second blocking member 90, reducing the risk of the second conductive part 41 being electrically connected to the first wall 12 through the second blocking member 90. Alternatively, the second blocking member 90 can be made of non-metallic material, such as plastic. Alternatively, in some embodiments, the second blocking member 90 includes a metal body, and the outer surface of the metal body can be provided with an insulating structure, which can isolate the fourth conductive part 411 and the metal body.

[0269] In the above solution, by setting a second blocking member 90 and setting at least a portion of the second blocking member 90 on the side of the fourth conductive part 411 facing away from the second deformable member 43, the offset of the fourth conductive part 411 relative to the second deformable member 43 can be effectively limited. This effectively reduces the risk that the fourth conductive part 411 will deviate from the second deformable member 43 due to the internal pressure of the battery cell 100, causing the second deformable member 43 to be unable to contact the fourth conductive part 411. This allows the second deformable member 43 to effectively contact the fourth conductive part 411 to achieve overcharge protection when the battery cell 100 is subjected to abuse conditions such as overcharging. This improves the reliability of the battery cell 100 and, in turn, improves the reliability of the battery 1000.

[0270] In some embodiments, the structure of the second blocking member 90 can be similar to that of the first blocking member 80. For example, the second blocking member 90 is an injection-molded structure, and insulating structures are respectively provided on the upper and lower sides of the second blocking member 90. The thickness of the insulating structure is not less than 0.4 mm and not more than 0.8 mm. The second blocking member 90 is generally arched and includes a third flange, a third side wall, a second top wall, a fourth side wall, and a fourth flange connected in sequence. The end of the third flange is welded to the first wall 12, the third side wall is inclined to the second top wall, the second top wall is located above the fourth conductive part 411, the fourth side wall is inclined to the second top wall, and the end of the fourth flange is welded to the first wall 12.

[0271] In some embodiments, the structure of the second conductive member 41 is similar to that of the first conductive member 31. For example, a clearance cavity is formed between the third conductive portion 410 and the fourth conductive portion 411, and the second blocking member 90 is located in the clearance cavity and outside the fourth conductive portion 411, pointing outward along the inner side of the first wall 12. The second blocking member 90 does not extend beyond the outer surface of the third conductive portion 410. For example, the strength of the third conductive portion 410 is greater than the strength of the fourth conductive portion 411. Optionally, along the thickness direction z of the first wall, the thickness of the fourth conductive portion 411 is less than the thickness of the third conductive portion 410. For example, along the thickness direction z of the first wall, the thickness of the fourth conductive portion 411 is greater than or equal to 0.5 mm and less than or equal to 3.0 mm. Further, along the thickness direction z of the first wall, the thickness of the fourth conductive portion 411 is greater than or equal to 1.0 mm and less than or equal to 2.0 mm. Optionally, to ensure that the second blocking member 90 effectively suppresses the fourth conductive part 411 and reduces the risk of the fourth conductive part 411 shifting due to impact, a weak part 312 can be provided between the third conductive part 410 and the fourth conductive part 411. For example, a third groove 412 can be provided between the third conductive part 410 and the fourth conductive part 411, serving as a stress groove. When the third conductive part 410 and the fourth conductive part 411 are subjected to force, the fourth conductive part 411 deforms relative to the third conductive part 410 under the pressure inside the battery cell 100 and the constraint of the second blocking member 90. This allows the fourth conductive part 411 to contact the second deformable member 43 under the constraint of the second blocking member 90 to achieve overcharge protection, thereby increasing the reliability of the battery cell 100 and, consequently, the reliability of the battery 1000.

[0272] In some embodiments, similar to forming a second groove 124 on the first wall 12, a fourth groove 125 may be formed on the first wall 12, and the third insulating structure 60 and the second conductive member 41 may be at least partially disposed in the fourth groove 125. In some embodiments, the fourth groove 125 includes two second groove sidewalls opposite to each other along the second direction y, at least one of the second groove sidewalls being formed with a second positioning groove 1250, and one end of the second blocking member 90 along the second direction y being disposed in the second positioning groove 1250. Correspondingly, at least one side of the third insulating structure 60 along the second direction y is formed with a second clearance groove 601, the second positioning groove 1250 and the second clearance groove 601 being positioned to avoid the second blocking member 90.

[0273] Optionally, please refer to Figure 15, which is a top view of the first wall 12 in some embodiments of this application. The two second groove sidewalls of the fourth groove 125, which are opposite each other along the second direction y, are respectively formed with second positioning grooves 1250. Similar to the first insulating member 50 in Figure 12, the two sides of the third insulating structure 60 are respectively formed with second clearance grooves 601. The end of the third flange is disposed in one of the second positioning grooves 1250 and the third flange is located between one of the second positioning grooves 1250 and the second clearance groove 601. The end of the fourth flange is disposed in another second positioning groove 1250 and the fourth flange is located between the other second positioning groove 1250 and the first clearance groove 51.

[0274] According to some embodiments of this application, the minimum distance between the first blocking member 80 and the first pole post 32 along the first direction x is different from the minimum distance between the second blocking member 90 and the second pole post 42.

[0275] In some embodiments, along the first direction x, the distance between the portion of the first blocking member 80 closest to the first pole post 32 and the portion of the first pole post 32 closest to the first blocking member 80 is defined as a first value, and along the first direction x, the distance between the portion of the second blocking member 90 closest to the second pole post 42 and the portion of the second pole post 42 closest to the second blocking member 90 is defined as a second value, and the first value and the second value are different.

[0276] For example, on the same side along the second direction y, the minimum distance between the first positioning groove 1240 of the second groove 124 and the first through hole 120 is a third value, and the minimum distance between the second positioning groove 1250 of the fourth groove 125 and the third through hole 122 is a fourth value. The third value and the fourth value are different.

[0277] For example, the first pole post 32 and the second pole post 42 are arranged symmetrically about the center of the first wall 12, while the first positioning groove 1240 and the second positioning groove 1250 are not arranged symmetrically about the center of the first wall 12. When assembling the first insulating member 50 and the third insulating structure 60, the assembly positions of the first insulating member 50 and the third insulating structure 60 can be distinguished based on the correspondence between the first clearance groove 51 and the first positioning groove 1240, and the correspondence between the second clearance groove 601 and the second positioning groove 1250.

[0278] In the above scheme, by setting the minimum distance between the first blocking member 80 and the first terminal 32 to be different from the minimum distance between the second blocking member 90 and the second terminal 42, a foolproof function can be achieved, reducing the risk of incorrect installation of the first conductive member 31 or the second conductive member 41, which is conducive to improving the manufacturing efficiency of the battery cell 100, and thus conducive to improving the manufacturing efficiency of the battery 1000.

[0279] According to some embodiments of this application, a battery 1000 is also provided, which has a battery cell 100 as described above. Referring to Figure 3, the battery 1000 includes a battery cell 100 and a housing 200, with the battery cell 100 housed within the housing 200. The housing 200 provides space for the battery cell 100 and can have various structures. In the battery 1000, there can be one or more battery cells 100, and each battery cell 100 can be fixed to the housing 200 by means of connectors (such as bolts), or each battery cell 100 can be fixed to the housing 200 by adhesive bonding.

[0280] According to some embodiments of this application, an energy storage device is also provided, which includes the battery cell 100 described above.

[0281] In some embodiments, individual battery cells 100 can be first configured into a battery 1000, and one or more batteries 1000 are then applied to an energy storage device. Referring to Figure 2, the energy storage device may include a cabinet and multiple batteries 1000. The multiple batteries 1000 can be housed within the cabinet. The multiple batteries 1000 can be connected in series, in parallel, or in a mixed configuration.

[0282] According to some embodiments of this application, an electrical device is also provided, which includes the battery cell 100 or battery 1000 described above. In some embodiments, the battery cell 100 first constitutes the battery 1000, and one or more batteries 1000 are then applied in the electrical device.

[0283] In some embodiments, referring to FIG1, the electrical device is a vehicle 10000. The interior of the vehicle 10000 may be equipped with a controller 2000, a motor 3000 and a battery 1000, and the controller 2000 is used to control the battery 1000 to supply power to the motor 3000.

[0284] According to some embodiments of this application, a battery cell 100 is provided, as shown in Figures 4-15.

[0285] The battery 1000 includes a casing 10, an electrode assembly 20, a first electrode terminal 30, a first deformable member 33, a second electrode terminal 40, a second deformable member 43, a first blocking member 80, and a second blocking member 90.

[0286] The outer casing 10 is square and includes a housing 11 and a first wall 12. The housing 11 has an internal cavity for accommodating the electrode assembly 20. The housing 11 has an opening communicating with the cavity. The first wall 12 covers the opening of the housing 11 and forms a sealed connection, creating a sealed space for accommodating the electrode assembly 20 and the electrolyte. A fifth insulating structure 70 is provided on the inner surface of the first wall 12 for insulating and isolating the first wall 12 from the electrode assembly 20.

[0287] The first electrode terminal 30, the first deformable member 33, the second electrode terminal 40, the second deformable member 43, the first blocking member 80, and the second blocking member 90 are mounted on the first wall 12. The first electrode terminal 30 is insulated from the first wall 12 by an insulating structure (e.g., the first electrode terminal 30 is insulated from the first wall 12 by a first insulating member 50 and a second insulating structure), and the second electrode terminal 40 is also insulated from the first wall 12 by an insulating structure (e.g., the second electrode terminal 40 is insulated from the first wall 12 by a third insulating member 88 and a fourth insulating structure 61). The first deformable member 33 and the second deformable member 43 are respectively welded to the inner surface of the first wall 12 and are electrically connected to the first wall 12.

[0288] The first wall 12 has a second groove 124 and a fourth groove 125 arranged along the first direction x. The bottom wall of the second groove 124 has a first through hole 120 and a second through hole 121 arranged along the first direction x. The bottom wall of the fourth groove 125 has a third through hole 122 and a fourth through hole 123 arranged along the first direction x.

[0289] The first electrode terminal 30 includes a first conductive element 31 and a first electrode post 32. The first conductive element 31 and the first insulating element 50 are disposed in the second groove 124. The first conductive element 31 includes a first conductive portion 310 and a second conductive portion 311 arranged along a first direction x. The first electrode post 32 is connected to the first electrode tab 21 through a first adapter 22. The end of the first electrode post 32 passes through the first through hole 120 and is riveted to the first conductive portion 310. The first conductive portion 310 can be welded to an external busbar component. The second conductive portion 311 and the first deformable element 33 are disposed opposite to each other along the direction of the first wall 12 and respectively close the second through hole 121. The first deformable element 33 is used to pass through the second through hole 121 to contact the second conductive portion 311. In some embodiments, the upper part of the second conductive portion 311 is thinned so that the strength of the second conductive portion 311 is less than the strength of the first conductive portion 310. In some embodiments, a stress groove is provided between the first conductive portion 310 and the second conductive portion 311.

[0290] The second electrode terminal 40 includes a second conductive element 41 and a second electrode post 42. The second conductive element 41 and the third insulating structure 60 are disposed in the fourth groove 125. The second conductive element 41 includes a third conductive portion 410 and a fourth conductive portion 411 arranged along the first direction x. The second electrode post 42 is connected to the second electrode tab 23 through the second adapter 24. The end of the second electrode post 42 passes through the third through hole 122 and is riveted to the third conductive portion 410. The third conductive portion 410 can be welded to an external busbar component. The fourth conductive portion 411 and the second deformable member 43 are disposed opposite to each other along the direction of the first wall 12 and respectively close the fourth through hole 123. The second deformable member 43 is used to pass through the fourth through hole 123 to contact the second conductive portion 411. In some embodiments, the upper part of the fourth conductive portion 411 is thinned so that the strength of the fourth conductive portion 411 is less than the strength of the third conductive portion 410. In some embodiments, a stress groove is provided between the third conductive portion 410 and the fourth conductive portion 411.

[0291] The two first groove sidewalls of the second groove 124, which are opposite to each other along the second direction y, are respectively formed with first positioning grooves 1240. The two sides of the first insulating member 50 are respectively formed with first clearance grooves 51. One end of the first blocking member 80 is disposed in one of the first positioning grooves 1240 and is located between the first positioning groove 1240 and the first clearance groove 51. The other end of the first blocking member 80 is disposed in the other first positioning groove 1240 and is located between the other first positioning groove 1240 and the first clearance groove 51. The main body of the first blocking member 80 is disposed above the second conductive part 311 and is used to restrict the second conductive part 311 from shifting in the direction away from the first deformable member 33.

[0292] The two second groove sidewalls of the fourth groove 125, which are opposite to each other along the second direction y, are respectively formed with second positioning grooves 1250. The two sides of the third insulating structure 60 are respectively formed with second clearance grooves 601. One end of the second blocking member 90 is disposed in one of the second positioning grooves 1250 and is located between the second positioning groove 1250 and the second clearance groove 601. The other end of the second blocking member 90 is disposed in the other second positioning groove 1250 and is located between the other second positioning groove 1250 and the second clearance groove 601. The main body of the second blocking member 90 is disposed above the fourth conductive part 411 and is used to limit the fourth conductive part 411 from shifting in the direction away from the first deformable member 33.

[0293] In the above scheme, by setting the first blocking member 80 and the second blocking member 90, the second conductive part 311 can be constrained to suppress the offset of the second conductive part 311 relative to the first deformable member 33, and the fourth conductive part 411 can be constrained to suppress the offset of the fourth conductive part 411 relative to the second deformable member 43. This allows the first deformable member 33 to effectively contact the second conductive part 311 and the second deformable member 43 to effectively contact the fourth conductive part 411 when the battery cell 100 is subjected to abuse conditions such as overcharging. This enables the positive and negative electrodes inside the battery cell 100 to be short-circuited to achieve overcharge protection, which is beneficial to improving the reliability of the battery cell 100 and thus to improving the reliability of the battery 1000.

[0294] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall; A first conductive element is at least partially disposed on the outside of the first wall and is insulated from the first wall. The first conductive element includes a first conductive portion and a second conductive portion arranged along a first direction. The first electrode post is connected to the first conductive part; A first deformable member is electrically connected to the first wall, and the first deformable member is configured to deform to contact the second conductive portion to electrically connect the first pole post to the first wall. A first blocking member is connected to the first wall, and at least a portion of the first blocking member is located on the side of the second conductive portion opposite to the first deformable member.

2. The battery cell according to claim 1, wherein, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first blocking member and the orthographic projection of the first deformable member at least partially overlap.

3. The battery cell according to claim 1 or 2, wherein, Along the thickness direction of the first wall, the first conductive portion has a first surface opposite to the first wall, and the first blocking member has a second surface opposite to the second conductive portion. Along the direction from the inside of the first wall to the outside of the first wall, the first surface extends beyond the second surface, or the first surface and the second surface are flush.

4. The battery cell according to any one of claims 1-3, wherein, The strength of the first conductive part is greater than the strength of the second conductive part.

5. The battery cell according to claim 4, wherein, Along the thickness direction of the first wall, the thickness of the second conductive part is less than the thickness of the first conductive part.

6. The battery cell according to claim 5, wherein, Along the thickness direction of the first wall, the thickness of the second conductive part is greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

7. The battery cell according to claim 6, wherein, Along the thickness direction of the first wall, the thickness of the second conductive part is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

8. The battery cell according to any one of claims 5-7, wherein, Along the thickness direction of the first wall, the first conductive portion has a first surface facing away from the first wall, and the second conductive portion has a third surface facing away from the first wall. Along the direction from the inside of the first wall to the outside of the first wall, the first surface protrudes from the third surface by a dimension greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

9. The battery cell according to claim 8, wherein, Along the direction from the inside of the first wall to the outside of the first wall, the first surface protrudes from the third surface by a dimension greater than or equal to 1.0 mm and less than or equal to 1.5 mm.

10. The battery cell according to any one of claims 1-9, wherein, The first conductive element further includes a weak portion, which is disposed between the first conductive portion and the second conductive portion.

11. The battery cell according to claim 10, wherein, The first conductive element has a first groove on one side along the thickness direction of the first wall, and the part of the first conductive element corresponding to the first groove is the weak part.

12. The battery cell according to claim 11, wherein, Along the thickness direction of the first wall, the depth of the first groove is greater than or equal to 0.1 mm and less than or equal to 2 mm.

13. The battery cell according to claim 12, wherein, Along the thickness direction of the first wall, the depth of the first groove is greater than or equal to 0.5 mm and less than or equal to 1 mm.

14. The battery cell according to any one of claims 11-13, wherein, Along the first direction, the maximum width of the first groove is greater than or equal to 0.1 mm and less than or equal to 3 mm.

15. The battery cell according to claim 14, wherein, Along the first direction, the maximum width of the first groove is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

16. The battery cell according to any one of claims 1-15, wherein, The first blocking member is connected to the first wall at its two opposite ends along the second direction, and the second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other.

17. The battery cell according to claim 16, wherein, The battery cell further includes a first insulating member, at least a portion of which is disposed between the first conductive member and the first wall, for insulating and isolating the first conductive member and the first wall.

18. The battery cell according to claim 17, wherein, A second groove is formed on the outer surface of the first wall, the first conductive element is disposed in the second groove, and at least a portion of the first insulating element is disposed in the second groove.

19. The battery cell according to claim 18, wherein, The second groove includes two first groove sidewalls that are opposite to each other along the second direction, at least one of the first groove sidewalls being formed with a first positioning groove, and one end of the first blocking member along the second direction being disposed in the first positioning groove.

20. The battery cell according to claim 19, wherein, The first insulating member has a first clearance groove formed on at least one side along the second direction, the first positioning groove corresponds to the position of the first clearance groove, and the first clearance groove is used to avoid the first blocking member.

21. The battery cell according to any one of claims 1-20, wherein, The first blocking member includes a first top wall, a first side wall, and a second side wall; The first sidewall and the second sidewall are spaced apart along a second direction, and the first top wall connects the first sidewall and the second sidewall; At least a portion of the second conductive part is located between the first sidewall and the second sidewall, and the first top wall is located on the side of the second conductive part away from the first deformable member. The second direction, the first direction, and the thickness direction of the first wall are perpendicular to each other.

22. The battery cell according to claim 21, wherein, The first blocking member further includes a first flange and a second flange. The first flange is connected to the end of the first side wall opposite to the first top wall, and the second flange is connected to the end of the second side wall opposite to the first top wall. The first flange and the second flange are respectively connected to the first wall.

23. The battery cell according to any one of claims 1-22, wherein, A second insulating member is provided on the side of the first blocking member facing away from the first wall. The second insulating member is used to insulate and isolate the first blocking member from the external busbar component, and / or a third insulating member is provided on the side of the first blocking member facing the first wall. The third insulating member is used to insulate and isolate the first blocking member from the second conductive part.

24. The battery cell according to claim 23, wherein, Along the thickness direction of the first wall, the thickness of the second insulating element is not less than 0.4 mm and not more than 0.8 mm; Along the thickness direction of the first wall, the thickness of the third insulating element is not less than 0.4 mm and not more than 0.8 mm.

25. The battery cell according to claim 23 or 24, wherein, The first blocking member, the second insulating member, and the third insulating member are integrally formed.

26. The battery cell according to any one of claims 1-25, wherein, The battery cell also includes: The second conductive element is at least partially disposed on the outside of the first wall and is insulated from the first wall; The second electrode post is connected to the second conductive element; The second deformable member is electrically connected to the first wall, and the second deformable member is configured to deform to be electrically connected to the second conductive member to electrically connect the second pole to the first wall.

27. The battery cell according to claim 26, wherein, The second conductive element includes a third conductive portion and a fourth conductive portion arranged along the first direction. The third conductive portion is connected to the second pole post, and the second deformable element is used to contact the fourth conductive portion. The battery cell further includes a second blocking member, which is connected to the first wall, and at least a portion of the second blocking member is located on the side of the fourth conductive portion opposite to the second deformable member.

28. The battery cell according to claim 27, wherein, Along the first direction, the minimum distance between the first blocking member and the first pole post is different from the minimum distance between the second blocking member and the second pole post.

29. A battery, wherein, Includes the battery cell as described in any one of claims 1-28.

30. An energy storage device, wherein, Includes the battery cell as described in any one of claims 1-28.

31. An electrical device, wherein, Includes the battery cell according to any one of claims 1-28, and / or the battery according to claim 29; the battery cell is used to provide electrical energy.

Images