Battery cell, battery pack and electric device

Abstract

The utility model discloses a kind of through the setting stop in the pylon seal structure and pole core between electric core, and make stop respectively with pylon seal structure and pole core abut, further realize the limiting of stop to pole core, to prevent pole core moves with the movement of electric core, to reduce the problem such as crack breakage of pole lug, improve the security of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, battery pack and electrical equipment. Background Technology

[0002] Nowadays, with the rapid development of new energy vehicles, people's demand for power batteries is increasing.

[0003] Current batteries, such as cylindrical batteries, generally include a casing, electrode cores, and lead-out components. The casing houses the electrode cores, and the tabs of the electrode cores are electrically connected to the lead-out components. Therefore, in existing technologies, as the cylindrical battery moves, the electrode cores may shift, potentially leading to risks such as tab breakage. This can cause the battery to become electrically conductive, resulting in open circuits and posing safety risks during battery use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the risk of electrode breakage in existing battery cells by proposing a battery cell, battery pack, and electric vehicle.

[0005] To solve the above-mentioned technical problems, this utility model provides a battery cell, the battery cell comprising:

[0006] A battery cell housing, the battery cell housing having a housing body and a receiving cavity, the housing body having a sealing structure recessed toward the receiving cavity;

[0007] The electrode core is located within the accommodating cavity;

[0008] The stop member, at least a portion of which is located between the pole core and the sealing structure, and respectively abuts against the pole core and the sealing structure.

[0009] In one embodiment disclosed in this application, the stop member has a body portion and a protrusion portion, the protrusion portion being located between the electrode core and the sealing structure, and the body portion being used for the electrode tab of the electrode core to pass through.

[0010] In one embodiment disclosed in this application, along a first direction, H1 > H2, wherein the first direction is the arrangement direction of the pole core and the sealing structure, H1 is the length of the protrusion along the first direction, H2 is the length of the body part along the first direction, and the units of H1 and H2 are the same.

[0011] In one embodiment disclosed in this application, (H1-H2)≤L1≤1.5*(H1-H2), where L1 is the length of the protrusion along the second direction, the second direction is the direction in which the body and the protrusion are arranged, and is perpendicular to the first direction.

[0012] In one embodiment disclosed in this application, H2 satisfies: 0.05≤H2≤1.2.

[0013] In one embodiment disclosed in this application, the main body is provided with an electrode tab through hole and an impregnation hole, and the electrode tab through hole is arranged around the impregnation hole.

[0014] In one embodiment disclosed in this application, 0.2*S≤S1≤0.85*S, where S is the orthographic projection area of ​​the pole core along the first direction, S1 is the area of ​​the stop member abutting against the pole core, and the first direction is the arrangement direction of the pole core and the pier sealing structure.

[0015] In one embodiment disclosed in this application, the shell body has a fixing portion opposite to the sealing structure, and the battery cell further includes:

[0016] Lead-out assembly, the lead-out assembly being used for electrical connection with the tab of the electrode core;

[0017] A seal located between the housing body and the lead-out assembly;

[0018] At least a portion of the lead-out components are located between the fixing part and the sealing structure, and abut against the sealing element.

[0019] In one embodiment disclosed in this application, the seal and the stop are integrally formed.

[0020] In one embodiment disclosed in this application, at least a portion of the stopper is located between the lead-out assembly and the electrode core, and respectively abuts against the lead-out assembly and the electrode core.

[0021] In one embodiment disclosed in this application, the extraction component includes:

[0022] A current collector, the current collector being adapted to connect to the tab of the electrode core;

[0023] An external terminal is provided, which is adapted to be electrically connected to the current collector and to be connected to an external electrical connection component.

[0024] In one embodiment disclosed in this application, the stop member includes an annular member disposed around the collector plate; and / or, the stop member includes an annular member, and the collector plate is disposed on the annular member.

[0025] In one embodiment disclosed in this application, the battery cell is a cylindrical battery cell.

[0026] In one embodiment disclosed in this application, the stop is an insulating element.

[0027] Secondly, this application also discloses a battery pack that includes the aforementioned battery cells.

[0028] Thirdly, this application also discloses an electrical device that further includes the aforementioned battery cell or battery pack.

[0029] The beneficial effects of this utility model are as follows: By setting a stopper between the battery cell's sealing structure and the electrode core, and making the stopper abut against both the sealing structure and the electrode core, the stopper limits the electrode core, preventing the electrode core from moving with the movement of the battery cell, thereby reducing problems such as cracking and damage of the electrode tabs and improving battery safety. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a battery cell provided in one embodiment of the present invention.

[0031] Figure 2 yes Figure 1 Cross-sectional view at point A-A'.

[0032] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0033] Figure 4 This is a partially enlarged schematic diagram of the cross-section of a battery cell according to an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of a stop member according to an embodiment of the present invention.

[0035] Figure 6 This is a partially enlarged schematic diagram of the cross-section of the battery cell according to another embodiment of the present invention.

[0036] Figure 7 This is a partially enlarged schematic diagram of the cross-section of the battery cell according to another embodiment of the present invention.

[0037] The reference numerals in the accompanying drawings are as follows:

[0038] 10. Battery cells;

[0039] 100. Cell casing; 110. Casing body; 111. Sealing structure; 112. Fixing part; 120. Receiving cavity;

[0040] 200, Core; 210, Tab;

[0041] 300. Stop; 310. Body; 311. Through hole for pole lug; 312. Wetting hole; 320. Protrusion; 330. Ring-shaped part;

[0042] 400. Lead-out assembly; 410. Current collector; 420. External terminal; 430. Explosion-proof component; 440. Current interruption component;

[0043] 500. Sealing components. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] In order to solve at least one problem existing in the prior art, such as Figure 2 As shown, this application discloses a battery cell 10, which includes a battery cell housing 100, an electrode core 200, and a stop member 300. The battery cell housing 100 has a housing body 110 and a receiving cavity 120 for accommodating the electrode core 200. The housing body 110 has a sealing structure 111 recessed toward the receiving cavity 120. At least a portion of the stop member 300 is located between the electrode core 200 and the sealing structure 111, and abuts against the electrode core 200 and the sealing structure 111, respectively. By setting a stopper 300 between the sealing structure 111 and the electrode core 200, and making the stopper 300 abut against the sealing structure 111 and the electrode core 200 respectively, on the one hand, the setting of the sealing structure 111 can reduce the movement of the electrode core 200 in the first direction within the battery cell 10; on the other hand, since the space between the electrode core 200 and the sealing structure 111 is limited by the stopper 300, when the battery cell 10 moves, the electrode core 200 has no room to move, and therefore the tab 210 cannot be displaced or deformed, thereby reducing the possibility of cracking or damage to the tab 210 and improving the safety of the battery.

[0046] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0047] In the embodiments disclosed in this application, such as Figure 1-7 As shown, the first direction is the height direction of the cell 10, the axial direction of the battery, or the arrangement direction of the electrode core 200 and the sealing structure 111, and the second direction is the radial direction of the cell 10, the arrangement direction of the body part 310 and the protrusion 320, or the horizontal direction.

[0048] In a first aspect, one embodiment of this application discloses a battery cell 10, such as Figure 1-3As shown, the battery cell 10 includes a cell housing 100, an electrode core 200, and a lead-out assembly 400. The cell housing 100 has a receiving cavity 120, and the electrode core 200 is disposed within the receiving cavity 120. The electrode core 200 has a tab 210, which is electrically connected to the lead-out assembly 400 to enable the battery to output power externally.

[0049] In the embodiments of this application, such as Figure 2 As shown, the battery cell 10 is a cylindrical battery cell 10, and the electrode core 200 is a wound cylindrical electrode core 200, which is located inside the battery cell housing 100. In addition, in other embodiments, the battery cell can also be a battery cell of other shapes, such as a prismatic battery cell.

[0050] Furthermore, in one embodiment of this application, as Figure 3 As shown, the battery cell 10 also includes a sealing element 500, which is located between the housing body 110 and the lead-out assembly 400. At least one end of the battery cell housing 100 has an opening, and the lead-out assembly 400 is disposed at this opening. The lead-out assembly 400 is fixed by the battery cell housing 100 and the sealing element 500, thereby closing the opening of the lead-out assembly 400. Specifically, the housing body 110 has a fixing portion 112 opposite to the sealing structure 111. At least a portion of the lead-out assembly 400 is located between the fixing portion 112 and the sealing structure 111, and abuts against the sealing element 500. The battery cell 10 uses the sealing structure 111 and the fixing portion 112 to clamp the sealing element 500 and the lead-out assembly 400, thus fixing the lead-out assembly 400 to the battery cell housing 100.

[0051] In one embodiment of this application, as Figure 3 As shown, the lead-out component 400 can be a positive lead-out component 400, that is, the positive tab 210 of the electrode core 200 is electrically connected to the lead-out component 400 so that the lead-out component 400 serves as the positive terminal of the battery cell 10. Furthermore, in other embodiments, the lead-out component can be a negative lead-out component, that is, the negative tab of the electrode core is electrically connected to the lead-out component so that the lead-out component serves as the positive terminal of the battery cell.

[0052] Generally, the lead-out assembly of a battery cell includes a positive lead-out assembly and a negative lead-out assembly, which are respectively disposed on both sides of the core along a first direction. Regarding the connection method between the positive lead-out assembly and the battery cell housing, in one embodiment of this application, the positive lead-out assembly and the battery cell housing are fixedly and sealed together by a sealing member and a sealing structure and fixing part at one end of the battery cell housing along the first direction. In other embodiments, the positive lead-out assembly can also be directly connected to a portion of the battery cell housing by welding. Regarding the connection method between the negative lead-out assembly and the battery cell housing, in one embodiment of this application, a negative lead-out assembly is disposed at the other end of the battery cell housing along the first direction. This end of the battery cell housing can be sealed and connected to an independently disposed cover plate, and the cover plate is electrically connected to the negative lead-out assembly. In other embodiments, the battery cell housing and the cover plate can be integrally formed, and the cover plate is electrically connected to the negative lead-out assembly. Furthermore, in the above embodiments, the negative lead-out assembly can be electrically connected to the battery cell housing to energize the battery cell housing.

[0053] In one embodiment of this application, such as Figure 3 As shown, the lead-out component 400 includes an external terminal 420 and a current collector 410. The tab 210 of the electrode core 200 is electrically connected to the current collector 410, and the current collector 410 is electrically connected to the external terminal 420. The current collector 410 can improve the current carrying capacity of the cell 10. Generally, in one embodiment, the current collector 410 is a plate-like structure, and its projection shape along the height direction of the cell 10 is basically consistent with the projection shape of the electrode core 200 in the height direction, so as to ensure that the structure of the current collector 410 is easier to manufacture and reduce the impact of the current collector 410 on the internal space of the battery. In another embodiment, the current collector 410 can also be a non-plate-like structure. Furthermore, the specific structure of the current collector 410 can be adjusted according to requirements, which will not be elaborated in detail in this application. Furthermore, the thickness of the current collector 410 along the first direction is greater than or equal to 0.05 and less than or equal to 0.8. On the one hand, limiting the thickness of the current collector 410 can reduce the risk of welding through the diaphragm when welding the tab 210 to the current collector 410; on the other hand, it can also ensure that there is a suitable bending space in the cell 10, reducing waste in the space of the cell 10.

[0054] Furthermore, in one embodiment of this application, as Figure 3As shown, the lead-out assembly 400 may further include an explosion-proof plate and a current interruption device 440. The external terminal 420, explosion-proof plate 430, current interruption device 440, and current collector 410 are arranged along the height direction of the cell 10 and electrically connected sequentially. Furthermore, the current collector 410 is also electrically connected to the battery tab 210 to form a current path from the tab 210 to the external terminal 420. The explosion-proof plate 430 has grooves. After thermal runaway of the cell 10, excessive gas is generated to break through the grooves on the explosion-proof plate 430, thereby disconnecting the explosion-proof plate 430 from the current interruption device 440, thus breaking the current circuit and further improving the safety of the cell 10. In another embodiment, the explosion-proof plate can be directly electrically connected to the current collector or directly to the tab to further shorten the distance between the external terminal and the cell, thereby increasing the height of the cell and thus increasing the volumetric energy density of the cell.

[0055] In the above-disclosed embodiments, the external terminal can be a pole post or an external top cover, and the specific structural form can be set according to actual needs.

[0056] In the embodiments disclosed above, the cell housing 100 and the lead-out assembly 400 are both made of metallic materials, such as aluminum or steel. The sealing structure 111 is formed by stamping / pressing.

[0057] One embodiment of this application discloses a battery cell 10, such as... Figure 3 As shown in Figure 4, the battery cell 10 also includes a stop member 300, wherein at least a portion of the stop member 300 is located between the electrode core 200 and the sealing structure 111, and abuts against both the electrode core 200 and the sealing structure 111. The embodiments disclosed in this application, by providing a stop member 300 between the sealing structure 111 and the electrode core 200 of the battery cell 10, and by having the stop member 300 abut against both the sealing structure 111 and the electrode core 200, thereby limiting the electrode core 200 and preventing it from moving with the movement of the battery cell 10, thus reducing the risk of cracking or damage to the tab 210 and improving battery safety. The stop 300 abuts against the pier sealing structure 111 and the pole core 200 respectively, which can provide an interference fit between the stop 300 and the pier sealing structure 111 and the pole core 200 respectively, thereby improving the stopping effect of the stop 300 and reducing the risk of the stop 300 moving or falling off.

[0058] In the above embodiments, one installation process of the battery cell 10 is as follows: the negative electrode lead-out assembly 400 is electrically connected to the negative electrode tab 210 of the electrode core 200, and both are placed inside the battery casing; a stop member 300 is disposed at the positive electrode tab 210 end of the electrode core 200, and the battery cell casing 100 is recessed into the receiving cavity by processes such as stamping or pressing to form a sealing structure 111, so as to achieve an interference fit between the stop member 300, the sealing structure 111, and the electrode core 200; then the positive electrode lead-out assembly 400 is electrically connected to the positive electrode tab 210, and the lead-out assembly 400 is sealed and fixedly connected by the fixing part 112, the sealing structure 111, and the sealing member 500 to form the battery cell 10. In other embodiments, the battery cell 10 may also use other installation processes, which will not be described in detail in this application.

[0059] In one embodiment of this application, the stop 300 is an insulating component to ensure the electrical safety inside the battery cell 10 and reduce the risk of insulation failure inside the battery cell 10. Further, in one embodiment, the stop 300 can be injection molded from an insulating material to simplify the process of the stop 300. In other embodiments, the stop 300 can be formed using other conventional processes, which will not be further elaborated upon in this application.

[0060] Furthermore, in one embodiment of this application, as Figure 3-5 As shown, the stop 300 includes a body portion 310 and a protrusion 320. The protrusion 320 is located between the electrode core 200 and the sealing structure 111 and abuts against the electrode core 200 and the sealing structure 111. The stop 300 limits the movement of the electrode core 200 through the protrusion 320. The body portion 310 is connected to the protrusion 320 to form an integral structure, and the body portion 310 has a tab 210 hole for the tab 210 of the electrode core 200 to pass through. The body portion 310 can also further restrict the movement of the electrode core 200 to further reduce the risk of the tab 210 cracking.

[0061] Furthermore, a stop 300 is disposed between the collector plate 410 and the electrode core 200. The electrode tab 210 can pass through the stop 300 and be welded to the collector plate 410, meaning the stop 300 is a single integral structure. The electrode tab 210 is electrically connected to the collector plate 410 by passing through the body portion 310. Besides limiting the electrode core 200, the stop 300 also ensures its safety, preventing residue or other foreign matter generated during the fixing of the lead-out assembly 400 to the cell housing 100 or during electrical connections within the lead-out assembly 400 from entering the electrode core 200, thereby reducing the risk of a short circuit within the electrode core 200.

[0062] Furthermore, in the above embodiments, such as Figure 3-5As shown, the length H1 of the protrusion 320 along the first direction is greater than the length H2 of the body portion 310 along the first direction. By limiting H1 to be greater than H2, on the one hand, sufficient space is ensured when the tab 210 is electrically connected to the current collector 410 or the tab 210 is electrically connected to the lead-out assembly 400, reducing manufacturing difficulty. On the other hand, it can also form a space for collecting residues or other foreign objects generated when the lead-out assembly 400 is fixed to the cell housing 100 or when the internal structure of the lead-out assembly 400 is electrically connected, further preventing such foreign objects from entering the core 200 and improving the safety of the cell 10.

[0063] Furthermore, such as Figure 3-5 As shown, (H1-H2)≤L1≤1.5*(H1-H2), where L1 is the length of the protrusion 320 along the second direction. Through the above limitation, on the one hand, the stop 300 can increase its effective stopping space, ensuring that the stop 300 has sufficient stopping area, thereby further improving the stopping effect of the stop 300; on the other hand, it also ensures that there is sufficient space between the stop 300 and the lead-out assembly 400, further reducing the influence of the stop 300 on the lead-out assembly 400. In the above embodiment, H1, H2, and L1 have the same unit, for example, mm.

[0064] Furthermore, in one embodiment of this application, as Figure 3-5 As shown, H2 satisfies: 0.05≤H2≤1.2. When H2 satisfies the above limitation, on the one hand, the stopping effect of the stop 300 can be further improved; on the other hand, the space wastage caused by the stop 300 can be reduced, thereby further ensuring the capacity of the battery cell 10.

[0065] In one embodiment of this application, as Figure 3-5 As shown, 0.2*S≤S1≤0.85*S, where S is the projected area of ​​the electrode core 200 along the first direction, and S1 is the area of ​​the stop member 300 abutting against the electrode core 200. Through the above limitation, the stopping space of the stop member 300 for the electrode core 200 can be further increased, thereby reducing the risk of the stop member 300 damaging the electrode core 200. On the other hand, the size of the tab through hole 311 can also be further increased to ensure the reliability of the tab 210 passing through, and at the same time, it can accommodate a larger area tab 210 to increase the current-carrying area of ​​the battery and reduce the risk of low process yield.

[0066] In one embodiment of this application, as Figure 5As shown, the main body 310 is provided with a tab penetration hole 311 and a wetting hole 312. The tab penetration hole 311 is used for the tab 210 to pass through, and the wetting hole 312 is used for the passage of electrolyte, allowing for operations such as electrolyte injection into the battery cell 10. Furthermore, the tab penetration hole 311 is arranged around the wetting hole 312 to ensure the wetting effect of the electrolyte. Specifically, in one embodiment, the wetting hole 312 is located at the center of the stop member 300, and the tab penetration hole 311 is arranged around the wetting hole 312. In other embodiments, there may be multiple wetting holes 312. The arrangement of multiple wetting holes can further improve the electrolyte injection and wetting effect, and also improve the venting effect inside the battery cell.

[0067] In one embodiment of this application, the sealing element and the stop element are abutted together, so as to ensure the interference fit between the sealing structure and the pole core and the stop element, while the compression of the sealing element by the fixing part and the sealing result can further improve the stopping effect of the stop element. In other embodiments, such as Figure 6 As shown in Figure 7, the stop 300 can be disposed between the seal 500 and the electrode core 200 to reduce the installation difficulty of the stop. Furthermore, the seal 500 and the stop 300 are integrally molded to reduce the connection difficulty between them. In one embodiment of this application, at least a portion of the stop is located between the lead-out assembly and the electrode core, and respectively abuts against the lead-out assembly and the electrode core. The stop in the battery cell is disposed between the sealing structure and the electrode core, and between the lead-out assembly and the electrode core, which allows for a larger stopping area of ​​the stop and further improves the stopping effect.

[0068] In one embodiment of this application, the stop can be disposed between the sealing structure and the electrode core, or between the lead-out assembly and the electrode core, or between the seal and the electrode core. The stop can restrict the movement of the electrode core, allowing it to move with the battery cell, thereby reducing the risk of cracking or damage to the electrode tabs and improving battery safety. Furthermore, the stop can be integrated with the seal to reduce the manufacturing difficulty of the stop.

[0069] In another embodiment of this application, the stop member may have only a protrusion, or it may include a protrusion and a body portion, with the body portion connected to the protrusion. That is, the stop member is an annular member. This annular member may be only disposed between the sealing structure and the electrode core, or it may be partially disposed between the sealing structure and the electrode core, with the other part located between the lead-out assembly and the electrode core. The annular member ensures that the electrode tab has sufficient space for insertion and bending, and is suitable for cells with all electrode tabs.

[0070] Furthermore, when the lead-out assembly includes a current collector, in one embodiment, the annular member can be arranged around the current collector, that is, the current collector is arranged within the space surrounded by the annular member, to shorten the distance between the lead-out assembly and the electrode core, thereby achieving higher cell capacity and energy density. In another embodiment, the current collector is arranged on the annular member to realize the bearing function of the stop member on the current collector, thereby improving the reliability and stability of the current collector when welding it to the electrode tab.

[0071] In a second aspect, this application also discloses a battery pack having a battery pack housing and the aforementioned battery cells, the battery cells being located within the battery pack housing. The battery pack housing may include a tray and a top cover, the tray having a receiving cavity for accommodating the battery cells, and the top cover being connected to the tray to close the receiving cavity.

[0072] In a third aspect, this application also discloses an electrical device, including the battery described in the first aspect of this application or the battery pack described in the second aspect of this application.

[0073] The electrical equipment disclosed in this application can be any conventionally electrical equipment, including but not limited to electric vehicles, energy storage cabinets, energy storage systems, computers, electric vehicles, air conditioners, refrigerators, washing machines, microwave ovens, printers, fax machines, etc.

[0074] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0075] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery cell, characterized in that, The battery cell includes: A battery cell housing, the battery cell housing having a housing body and a receiving cavity, the housing body having a sealing structure recessed toward the receiving cavity; The electrode core is located within the accommodating cavity; The stop member, at least a portion of which is located between the pole core and the sealing structure, and respectively abuts against the pole core and the sealing structure.

2. The battery cell according to claim 1, characterized in that, The stop member has a body portion and a protrusion portion, the protrusion portion being located between the pole core and the sealing structure, and the body portion being used for the pole tab of the pole core to pass through.

3. The battery cell according to claim 2, characterized in that, Along the first direction, H1 > H2, where the first direction is the arrangement direction of the pole core and the sealing structure, H1 is the length of the protrusion along the first direction, H2 is the length of the body part along the first direction, and the units of H1 and H2 are the same.

4. The battery cell according to claim 3, characterized in that, (H1-H2)≤L1≤1.5*(H1-H2), where L1 is the length of the protrusion along the second direction, the second direction is the direction in which the body and the protrusion are arranged, and is perpendicular to the first direction.

5. The battery cell according to claim 3, characterized in that, The H2 satisfies: 0.05 ≤ H2 ≤ 1.

2.

6. The battery cell according to claim 2, characterized in that, The main body is provided with an electrode tab through hole and an impregnation hole, with the electrode tab through hole arranged around the impregnation hole.

7. The battery cell according to any one of claims 1-6, characterized in that, 0.2*S≤S1≤0.85*S, where S is the projected area of ​​the pole core along the first direction, S1 is the area of ​​the stop member abutting against the pole core, and the first direction is the arrangement direction of the pole core and the pier sealing structure.

8. The battery cell according to any one of claims 1-6, characterized in that, The shell body has a fixing part opposite to the sealing structure, and the battery cell further includes: Lead-out assembly, the lead-out assembly being used for electrical connection with the tab of the electrode core; A seal located between the housing body and the lead-out assembly; At least a portion of the lead-out components are located between the fixing part and the sealing structure, and abut against the sealing element.

9. The battery cell according to claim 8, characterized in that, The sealing element and the stop element are integrally formed.

10. The battery cell according to claim 8, characterized in that, At least a portion of the stop is located between the lead-out assembly and the electrode core, and abuts against the lead-out assembly and the electrode core respectively.

11. The battery cell according to claim 8, characterized in that, The extraction component includes: A current collector, the current collector being adapted to connect to the tab of the electrode core; An external terminal is provided, which is adapted to be electrically connected to the current collector and to be connected to an external electrical connection component.

12. The battery cell according to claim 11, characterized in that, The stop includes an annular element disposed around the collector plate; and / or, the stop includes an annular element on which the collector plate is disposed.

13. The battery cell according to any one of claims 1-6, characterized in that, The battery cell is a cylindrical battery cell.

14. The battery cell according to any one of claims 1-6, characterized in that, The stop is an insulating component.

15. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1-14.

16. An electrical appliance, characterized in that, This includes the battery cell as described in any one of claims 1-14 or the battery pack as described in claim 15.

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