Battery cells and batteries

Abstract

This application provides a battery cell and a battery. The battery cell includes: an electrode assembly; a housing having at least one open end; a cover body connected to the open end and forming a receiving space for accommodating the electrode assembly; the cover body is connected to an explosion-proof valve; and a lower insulating member, including an insulating body connected to the surface of the cover body near the electrode assembly. A protruding protrusion is formed on the surface of the insulating body near the electrode assembly, and the protrusion has a through-venting channel. A protruding reinforcing structure is formed on the inner surface of the venting channel. The battery cell and battery provided by this application, when the lower insulating member is compressed by the expanding electrode assembly, can prevent deformation of the lower insulating member due to the supporting effect of the reinforcing structure, ensuring that gas can flow smoothly through the venting channel to the open explosion-proof valve, thereby helping to improve the safety performance of the battery cell.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery cell and a battery. Background Technology

[0002] In the development of battery technology, besides improving the performance of individual battery cells, safety is also a crucial issue that cannot be ignored. If the safety of individual battery cells cannot be guaranteed, then those cells cannot be used. Therefore, how to enhance the safety of individual battery cells is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cell and a battery to at least partially solve the problem of low safety of battery cells.

[0004] Based on the above objectives, a first aspect of this application provides a battery cell, comprising: an electrode assembly; a housing having at least one open end; a cover body that covers and connects to the open end, and together with the housing to form a receiving space for accommodating the electrode assembly; the cover body is connected to an explosion-proof valve; and a lower insulating member comprising an insulating body connected to a surface of the cover body near the electrode assembly, the insulating body having a protrusion protruding toward the electrode assembly on the surface of the insulating body near the electrode assembly, the protrusion having a venting channel extending along the length of the cover body; and a reinforcing structure protruding toward the inner side of the venting channel formed on the inner surface of the venting channel.

[0005] Optionally, the preset direction of the ventilation channel is perpendicular to the extension direction of the ventilation channel; along the preset direction of the ventilation channel, the protrusion is provided with a protruding inner cavity isolated on at least one side of the ventilation channel, the protruding inner cavity and the ventilation channel are at least partially separated, and the reinforcing structure extends into the protruding inner cavity along the preset direction of the ventilation channel; and / or, the ventilation channel has an upstream air inlet and a downstream air outlet; in the same ventilation channel, along the extension direction of the ventilation channel, the distance from the air inlet to the air outlet is L, and the distance between the reinforcing structure and the air inlet is L1, 0 < L1 ≤ L × 1 / 2.

[0006] Optionally, the ventilation channel has two channel sidewalls, which are spaced apart along the thickness direction of the battery cell, and the reinforcing structure is disposed on at least one of the two channel sidewalls.

[0007] Optionally, the dimension of the lower insulating member along the thickness direction of the battery cell is W0; in the ventilation channel, the distance between the position of the reinforcing structure along the thickness direction of the battery cell is W1, W0×1 / 10≤W1≤W0×4 / 5; and / or, the same protrusion is provided with at least two ventilation channels, the at least two ventilation channels extend in the same direction and are spaced apart along the thickness direction of the battery cell, the distance between two adjacent ventilation channels is W3, W0×1 / 4≤W3≤W0×1 / 2.

[0008] Optionally, along the thickness direction of the battery cell, the minimum distance between the reinforcing structure and the protruding sidewall is W2, where W2 ≥ 5 mm.

[0009] Optionally, the electrode assembly includes an electrode body and tabs extending from the electrode body; the cover plate body is connected to at least one terminal assembly, the same terminal assembly is electrically connected to n tabs, and the same protrusion is provided with m ventilation channels, where n≤m≤2×n.

[0010] Optionally, the reinforcing structure includes a top exposed portion that protrudes from the side of the lower insulating member away from the electrode assembly. The surface of the cover plate body facing the electrode assembly has a positioning groove corresponding to the top exposed portion, and the cover plate body is connected to the top exposed portion through the positioning groove.

[0011] Optionally, the protrusion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion being spaced apart along the length direction of the cover plate body; the ventilation channel includes a first channel disposed on the first protrusion and a second channel disposed on the second protrusion; the reinforcing structure is asymmetrically disposed relative to the center point of the lower insulating member.

[0012] Optionally, the first channel and the second channel are each provided with the reinforcing structure, and at least one of the W1 of the first channel is different from the W1 of any of the second channels; or, the first channel and the second channel are each provided with the reinforcing structure, the reinforcing structure in the first channel extends into the protrusion cavity of the first protrusion, and at least one of the reinforcing structures in the second channel does not extend into the protrusion cavity of the second protrusion; or, the first channel and the second channel are each provided with the reinforcing structure, and at least one of the L1 of the first channel is different from the L1 of any of the second channels.

[0013] Based on the same inventive concept, the second aspect of this application also provides a battery, including a battery cell as described in the first aspect.

[0014] As can be seen from the above, the battery cell and battery provided in this application have a reinforcing structure formed on the inner surface of the venting channel. This reinforcing structure provides support to the inner surface it occupies and adjacent inner surfaces, thereby improving the structural strength of the inner surface of the venting channel. After the lower insulating component softens due to heat exchange with the high-temperature gas, the reinforcing structure enhances its ability to maintain its original structure. Even if the lower insulating component is compressed by the expanded electrode assembly, the deformation of the inner surface of the venting channel can be reduced, ensuring that gas can pass smoothly through the venting channel and exit through the explosion-proof valve into the battery cell. This ensures that the battery cell experiencing thermal runaway can be depressurized promptly, thereby improving the safety performance of the battery cell. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial cross-sectional schematic diagram of a battery cell with the first structure according to an embodiment of this application;

[0017] Figure 2 This is a partial cross-sectional schematic diagram of a battery cell with the second structure according to an embodiment of this application;

[0018] Figure 3 for Figure 2 Partial cross-sectional diagram of section AA;

[0019] Figure 4 for Figure 2 Partial cross-sectional diagram of section BB;

[0020] Figure 5 This is a partial cross-sectional view of the battery cell with the third type of structure at the BB section.

[0021] Figure 6 This is a partial cross-sectional schematic diagram of the lower insulating member and related structural members of a battery cell according to an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Shell; 110. Open end;

[0024] 200. Cover plate body; 210. Positioning groove;

[0025] 300. Lower insulating component; 310. Insulating body; 320. Protrusion; 321. Inner cavity of the protrusion; 322. First protrusion; 323. Second protrusion; 330. Ventilation channel; 331. Air inlet; 332. Air outlet; 333. Channel sidewall; 334. First channel; 335. Second channel;

[0026] 340. Reinforced structure; 341. Exposed top section;

[0027] 400. Electrode assembly; 410. Electrode body; 420. Tab;

[0028] 500. Capacity space;

[0029] 600, Explosion-proof valve; 700, Terminal assembly; 710, Electrode terminal; 720, Adapter. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0031] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0032] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0033] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0034] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Figure 1A partial cross-sectional schematic diagram of the battery cell of the first structure is shown.

[0036] by Figure 1 Taking the structure and orientation shown as an example, a single battery cell may include a housing 100, a cover plate body 200, and an electrode assembly 400. The housing 100 may have only one opening end 110 at the top, or it may have two opening ends 110, which are disposed opposite to each other on the housing 100. Each opening end 110 is correspondingly provided with a cover plate body 200, which closes and connects to the corresponding opening end 110, and together with the housing 100, forms a receiving space 500 for accommodating the electrode assembly 400.

[0037] The cover body 200 and the housing 100 can be made of aluminum or steel, etc. The cover body 200 and the housing 100 can be connected by means of adhesive, riveting or welding. For example, the cover body 200 and the housing 100 are made of aluminum, and the cover body 200 and the housing 100 are welded together.

[0038] The cover plate body 200 is also connected to a terminal assembly 700, which includes electrode terminals 710 connected to the cover plate body 200. The cover plate body 200 and the electrode terminals 710 can be connected by welding, gluing, or riveting. The terminal assembly 700 is located along the height direction of the battery cell (e.g., along the height direction of the battery cell). Figure 1 The cover plate body 200 extends from both ends in the Z direction. The external circuit can be electrically connected to the end of the terminal assembly 700 away from the electrode assembly 400. The electrode assembly 400 can be electrically connected to the end of the adjacent terminal assembly 700.

[0039] It should be noted that the number of electrode terminals 710 connected to the same cover body 200 is not limited. For example, the same cover body 200 may have two electrode terminals 710 connected to it. The polarities of the two electrode terminals 710 may be the same (e.g., both electrode terminals 710 may be positive terminals or both may be negative terminals) or they may not be exactly the same (e.g., one of the two electrode terminals 710 may be a positive terminal and the other a negative terminal). Understandably, the same cover body 200 may also have one electrode terminal 710 connected to it. In this case, the battery cell includes two cover bodies 200, one of which has a positive terminal connected to it, and the other cover body 200 has a negative terminal connected to it.

[0040] The cover plate body 200 is connected to an explosion-proof valve 600. The cover plate body 200 and the explosion-proof valve 600 can be connected by means of integral molding, welding, riveting, gluing or fasteners. The explosion-proof valve 600 and the electrode terminal 710 are arranged at intervals. When the same cover plate body 200 is connected to two electrode terminals 710, the explosion-proof valve 600 is located between the two electrode terminals 710.

[0041] A lower insulating member 300 is connected to the surface of the cover body 200 near the electrode assembly 400 (hereinafter referred to as the bottom surface of the cover body 200). The lower insulating member 300 includes an insulating body 310, which is connected to the bottom surface of the cover body 200. A protrusion 320 protruding toward the electrode assembly 400 is formed on the surface of the insulating body 310 near the electrode assembly 400 (hereinafter referred to as the bottom surface of the insulating body 310). The protrusion 320 is located on the side of the electrode terminal 710 away from the explosion-proof valve 600 along the length direction of the cover body 200.

[0042] The protrusion 320 is provided with a through ventilation channel 330. The opening of the ventilation channel 330 furthest from the explosion-proof valve 600 is the air inlet 331, and the opening closer to the explosion-proof valve 600 is the air outlet 332. When a battery cell experiences thermal runaway, the high-temperature gas in the containment space 500 can enter the ventilation channel 330 through the air inlet 331 and exit through the air outlet 332 before flowing to the explosion-proof valve 600 to discharge the battery cell (gas flow path as shown). Figure 1 (As shown by the arrow line in the image).

[0043] However, the applicant's research found that the lower insulating component 300 is usually an injection-molded structural component. When high-temperature gas flows through the lower insulating component 300, it will exchange heat with the lower insulating component 300, causing the lower insulating component 300 to soften easily due to heat, reducing its structural strength and making it unable to maintain its original structural shape. This leads to a reduction in the cross-sectional area of ​​the ventilation channel 330 (unless otherwise specified, the cross-section of the ventilation channel 330 refers to the cross-section perpendicular to the extension direction of the ventilation channel 330), obstructing gas flow, reducing the exhaust efficiency of the battery cell, and posing a safety risk to the battery cell.

[0044] Meanwhile, when a battery cell experiences thermal runaway, the electrode assembly 400 will expand. The expanded electrode assembly 400 will press upward against the lower insulator 300. Affected by the gas generated inside the battery cell, the electrode assembly 400 may also move inside the battery cell, pressing against the lower insulator 300. This will further force the lower insulator 300 to deform, increasing the risk of blockage of the ventilation channel 330.

[0045] To address the aforementioned issues, this embodiment provides a single battery cell.

[0046] Figure 2 A partial cross-sectional diagram of a battery cell with the second structure is shown. Figure 3 Showing Figure 2 A partial cross-sectional diagram of section AA.

[0047] like Figure 2 and Figure 3 In some embodiments, the battery cell includes: an electrode assembly 400; a housing 100 having at least one open end 110; a cover body 200, which is connected to the open end 110 and surrounds the housing 100 to form a receiving space 500 for accommodating the electrode assembly 400; an explosion-proof valve 600 is connected to the cover body 200; and a lower insulating member 300, including an insulating body 310 connected to the bottom surface of the cover body 200, the bottom surface of the insulating body 310 having a protrusion 320 protruding toward the electrode assembly 400, the protrusion 320 being provided with a length direction (e.g., along the length of the cover body 200) Figure 3 A ventilation channel 330 extending through the X direction (hereinafter referred to as the first direction) is formed in the ventilation channel 330; a reinforcing structure 340 protruding toward the inside of the ventilation channel 330 is formed on the inner surface of the ventilation channel 330.

[0048] For example, the inner surface of the reinforcing structure 340 and the ventilation channel 330 can be connected by means of adhesive bonding, integral molding, snap-fitting or hot pressing.

[0049] For example, the thickness direction of a single battery cell is as follows: Figure 3 The ventilation channel 330 can extend in a straight line, and the extension direction can be parallel to or intersect with the first direction; when the extension direction of the ventilation channel 330 intersects with the first direction, the angle between the two is an acute angle with a small angle.

[0050] For example, the cross-sectional shape of the ventilation channel 330 can be circular, semi-circular, or polygonal.

[0051] For example, the reinforcing structure 340 may be disposed on the inner surface of the ventilation channel 330 near the cover body 200, or on the inner surface near the electrode assembly 400, or on another inner surface between the two inner surfaces.

[0052] For example, in the same ventilation channel 330, one, two, or more reinforcing structures 340 may be formed on the inner surface. When at least two reinforcing structures 340 are formed on the inner surface, the at least two reinforcing structures 340 may be disposed on the same side of the inner surface or on different sides of the inner surface. When at least two reinforcing structures 340 are disposed on the same side of the inner surface, the at least two reinforcing structures 340 are spaced apart along the extending direction of the ventilation channel 330.

[0053] In this embodiment, a reinforcing structure 340 is formed on the inner surface of the ventilation channel 330. The reinforcing structure 340 can at least provide some reinforcement and support to its own inner surface and adjacent inner surfaces, thereby improving the structural strength of the inner surface of the ventilation channel 330. After the lower insulating member 300 softens due to heat exchange with the high-temperature gas, the reinforcing structure 340 can improve the ability of the lower insulating member 300 to maintain its original structure. Even if the lower insulating member 300 is squeezed by the expanded electrode assembly 400, the deformation of the inner surface of the ventilation channel 330 can be reduced at least, ensuring that the gas can pass smoothly through the ventilation channel 330 and be discharged from the battery cell through the explosion-proof valve 600. This ensures that the battery cell in thermal runaway can be depressurized in time, thereby improving the safety performance of the battery cell.

[0054] like Figure 2 and Figure 3 In some embodiments, the preset direction of the ventilation channel 330 is perpendicular to the extension direction of the ventilation channel 330; along the preset direction of the ventilation channel 330, the protrusion 320 is provided with a protrusion cavity 321 isolated on at least one side of the ventilation channel 330, and the reinforcing structure 340 extends into the protrusion cavity 321 along the preset direction of the ventilation channel 330.

[0055] For example, the protruding inner cavity 321 may be disposed between the ventilation channel 330 and the electrode assembly 400, or between the ventilation channel 330 and the insulating body 310, or between the ventilation channel 330 and the side wall of the protrusion 320.

[0056] For example, along the preset direction of the ventilation channel 330, one, two or more protruding cavities 321 may be provided on the same side of the ventilation channel 330.

[0057] It should be noted that the isolation between the protruding inner cavity 321 and the ventilation channel 330 means that the two are completely isolated, or that only a small amount of airflow is allowed between them. When they are completely isolated, the gas entering the ventilation channel 330 can only flow to the outlet 332 of the ventilation channel 330 and will not flow into the protruding inner cavity 321. It should be understood that during the design and manufacturing process, it is difficult to guarantee complete isolation between the protruding inner cavity 321 and the ventilation channel 330. Therefore, the "isolation setting" here should not be understood only as no gas flowing into the protruding inner cavity 321, but also as most of the gas entering the ventilation channel 330 flowing to the outlet 332 of the ventilation channel 330, with only a small portion of the gas flowing into the protruding inner cavity 321.

[0058] Setting up the protruding inner cavity 321 can reduce the overall weight and material cost of the lower insulating component 300, which is beneficial to improving the mass energy density of the battery cell.

[0059] Extending the reinforcing structure 340 into the protruding inner cavity 321 allows the portion of the reinforcing structure 340 located in the protruding inner cavity 321 and the portion located in the ventilation channel 330 to jointly provide reinforced support for the lower insulating member 300.

[0060] Meanwhile, due to the isolation between the protruding inner cavity 321 and the venting channel 330, after thermal runaway of a single battery cell, only a small amount or even no high-temperature gas enters the protruding inner cavity 321, which makes the temperature in the protruding inner cavity 321 lower than the temperature in the venting channel 330. Understandably, the structural strength of the reinforcing structure 340 decreases with increasing ambient temperature (i.e., softens upon heating). Therefore, after thermal runaway occurs in a battery cell, the gas passing through the venting channel 330 primarily exchanges heat with the portion of the reinforcing structure 340 protruding from the inner surface of the venting channel 330. This means the temperature rise of this portion of the reinforcing structure 340 is more significant than that of the reinforcing structure 340 within the protruding inner cavity 321. Consequently, the structural strength of the portion of the reinforcing structure 340 located within the protruding inner cavity 321 is higher than that of the portion located within the venting channel 330. When the portion of the reinforcing structure 340 located within the venting channel 330 cannot maintain its original structure due to temperature increases, the reinforcing structure 340 located within the protruding inner cavity 321 can still provide support, further reducing the risk of deformation of the lower insulating component 300 and ensuring smooth gas flow through the venting channel 330, thereby further improving the safety performance of the battery cell.

[0061] like Figure 2 and Figure 3 In some embodiments, the ventilation channel 330 has an upstream air inlet 331 and a downstream air outlet 332; in the same ventilation channel 330, along the extension direction of the ventilation channel 330, the distance from the air inlet 331 to the air outlet 332 is L, and the distance between the reinforcing structure 340 and the air inlet 331 is L1, where 0 < L1 ≤ L × 1 / 2.

[0062] For example, L1 can be L×1 / 2, L×1 / 3, L×1 / 4 or L×1 / 5.

[0063] by Figure 3 The structure and orientation shown are used as an example for explanation. Figure 3 In the first direction, the extension direction of the ventilation channel 330 is parallel to the first direction, so L is equal to the dimension of the protrusion 320 along the first direction; if the ventilation channel 330 is inclined relative to the first direction, it is understandable that L will be greater than the dimension of the protrusion 320 along the first direction.

[0064] Still with Figure 3 Taking the example of the portion of the inner surface of the protruding ventilation channel 330 of the reinforcing structure 340, it has two edges along the first direction. Figure 3 The diagram shows that the outer contour of the reinforcing structure 340 intersects with the inner surface of the ventilation channel 330 at two points, one edge of which is close to the air inlet 331 of the ventilation channel 330, and the other is close to the air outlet 332. L1 represents the distance between the edge of the reinforcing structure 340 near the air inlet 331 and the air inlet 331.

[0065] Understandably, when a battery cell experiences thermal runaway, the hotter gas flows from the inlet 331 to the outlet 332 of the venting channel 330. During this flow, the hotter gas continuously exchanges heat with the inner surface of the venting channel 330. As a result, the temperature of the inner surface of the venting channel 330 near the inlet 331 will be higher than the temperature of the inner surface near the outlet 332. This makes the inner surface near the inlet 331 more susceptible to heat softening and deformation.

[0066] Therefore, if L1 is too large, the reinforcing structure 340 will be too far from the air inlet 331 of the ventilation channel 330, making it difficult to support the inner surface of the ventilation channel 330 near the air inlet 331. In this case, the inner surface near the air inlet 331 will still have a high risk of deformation. If L1 is too small, the reinforcing structure 340 will obstruct gas from entering the ventilation channel 330, potentially causing gas to accumulate at the air inlet 331 and preventing smooth passage through the ventilation channel 330. This could lead to vibration of the structural components near the ventilation channel 330, adversely affecting the exhaust efficiency and internal structural stability of the battery cell.

[0067] To avoid the above problems, in this embodiment, L1 is designed to be 0 < L1 ≤ L × 1 / 2. This not only allows the reinforcing structure 340 to reliably support the inner surface of the ventilation channel 330 near the air inlet 331, which is more prone to thermal deformation, thus reducing the risk of blockage in the ventilation channel 330, but also prevents the reinforcing structure 340 from hindering gas from entering the ventilation channel 330, ensuring that the battery cell has high exhaust efficiency and good internal structural stability.

[0068] Figure 4 Showing Figure 2 A partial cross-sectional diagram of section BB.

[0069] like Figure 2 , Figure 3 and Figure 4 In some embodiments, the ventilation channel 330 has two channel sidewalls 333, which are spaced apart along the thickness direction of the battery cell, and the reinforcing structure 340 is disposed on at least one of the two channel sidewalls 333.

[0070] For example, the cross-sectional shape of the ventilation channel 330 can be a right rectangle, a rounded rectangle, a circle, a triangle, or a trapezoid, etc.

[0071] For example, when both channel sidewalls 333 are provided with reinforcing structures 340, the reinforcing structures 340 on the two channel sidewalls 333 can be aligned or at least partially offset along the thickness direction of the battery cell.

[0072] For example, the reinforcing structure 340 disposed on the channel sidewall 333 can extend along the height direction of the battery cell, and the upper end can be directly connected to or spaced from the inner surface of the venting channel 330 away from the electrode assembly 400 (hereinafter referred to as the top surface of the venting channel 330), and the lower end can be directly connected to or spaced from the inner surface of the venting channel 330 near the electrode assembly 400 (hereinafter referred to as the bottom surface of the venting channel 330).

[0073] For example, when the reinforcing structure 340 is not disposed in the protruding inner cavity 321, the reinforcing structure 340 can be a whole or part of a cylindrical, prism or frustum structure extending along the height direction of the battery cell. When the reinforcing structure 340 is disposed in the protruding inner cavity 321, the reinforcing structure 340 can be a whole or part of a cylindrical, prism or frustum structure extending along the height direction of the battery cell.

[0074] Combination Figure 4 It can be understood that when the electrode assembly 400 presses upward against the lower insulating member 300, causing the lower insulating member 300 to deform, the bottom surface of the ventilation channel 330 is likely to bend or move towards the top surface. If the protruding reinforcing structure 340 is placed on the bottom or top surface of the ventilation channel 330, the ventilation channel 330 is more likely to become blocked once the bottom surface of the ventilation channel 330 is deformed.

[0075] To avoid the above problems, in this embodiment, the reinforcing structure 340 is disposed on the channel sidewall 333 of the ventilation channel 330 along the thickness direction of the battery cell. Even if the ventilation channel 330 is slightly deformed, the reinforcing structure 340 will not only not aggravate the blockage of the ventilation channel 330, but also maintain the reinforcing support of the inner surface of the ventilation channel 330, which helps to slow down the further deformation of the ventilation channel 330.

[0076] like Figure 2 and Figure 3 In some embodiments, the dimension of the lower insulating member 300 along the thickness direction of the battery cell is W0; in the ventilation channel 330, the distance of the position of the reinforcing structure 340 along the thickness direction of the battery cell is W1, where W0×1 / 10≤W1≤W0×4 / 5.

[0077] For example, W1 can be W0×1 / 10, W0×1 / 5, W0×3 / 10, W0×2 / 5, W0×1 / 2, W0×3 / 5, W0×7 / 10 or W0×4 / 5.

[0078] Understandably, in the ventilation channel 330, only the part of the bottom surface of the ventilation channel 330 that is close to the channel sidewall 333 and the reinforcing structure 340 can be well supported, while the middle part of the bottom surface along the thickness direction of the battery cell is more prone to deformation because it is far from the channel sidewall 333 and the reinforcing structure 340.

[0079] If W1 is too large, the center of the bottom surface of the venting channel 330 will be too far from the channel sidewall 333 and the reinforcing structure 340, resulting in relatively poor pressure resistance and a high risk of deformation of the lower insulating component 300 after being heated and squeezed by the expanding electrode assembly 400. If W1 is too small, the cross-sectional area for gas flow in the venting channel 330 will be too small, leading to low venting efficiency of the battery cell.

[0080] To avoid the above problems, in this embodiment, W1 is designed as W0×1 / 10≤W1≤W0×4 / 5. On the one hand, this allows for a larger gas flow rate through the ventilation channel 330 per unit time, ensuring that high-temperature gas can flow through the ventilation channel 330 to the explosion-proof valve 600 and be discharged from the battery cell in a timely manner when thermal runaway occurs. On the other hand, it ensures that the reinforcing structure 340 can provide effective support for the inner surface of the ventilation channel 330, especially the bottom surface, further reducing the risk of deformation of the inner surface of the ventilation channel 330 and ensuring that gas can pass smoothly through the ventilation channel 330.

[0081] like Figure 2 and Figure 3 In some embodiments, the same protrusion 320 is provided with at least two ventilation channels 330. The at least two ventilation channels 330 extend in the same direction and are spaced apart along the thickness direction of the battery cell. The distance between two adjacent ventilation channels 330 is W3, where W0×1 / 4≤W3≤W0×1 / 2.

[0082] For example, W3 can be W0×1 / 4, W0×3 / 8, or W0×1 / 2.

[0083] It should be noted that W3 is the distance between the adjacent sidewalls 333 of the two ventilation channels 330. Specifically, as... Figure 3 Taking the structure and orientation shown as an example, the distance between the lower sidewall 333 of the upper left ventilation channel 330 and the upper sidewall 333 of the lower left ventilation channel 330 along the thickness direction of the battery cell is W3.

[0084] It should be noted that "the two ventilation channels 330 extend in the same direction" means that the two ventilation channels 330 extend in exactly the same or approximately the same direction. It should be understood that during the design and manufacturing process, the two ventilation channels 330 may not extend in exactly the same direction. Instead, there may be a certain angle between the actual extension direction of the two ventilation channels 330 and the first direction, in which case their extension directions are approximately the same. For example, if both ventilation channels 330 extend approximately along the first direction, that is, if both ventilation channels 330 penetrate the two surfaces of the protrusion 320 along the first direction, then it can be understood that the two ventilation channels 330 extend in the same direction.

[0085] Because the dimensions of the protrusion 320 along the thickness direction of the battery cell are limited, if W3 is too large, the distance between the sidewall 333 of the venting channel 330 and the sidewall of the adjacent protrusion 320 will be too small. Figure 3 Specifically, the distance between the channel sidewall 333 above the venting channel 330 located in the upper left corner and the sidewall above the protrusion 320 on the left side, along the thickness direction of the battery cell, is too small. This results in less material in the portion between these two parts of the lower insulating component 300, leading to lower structural strength. Furthermore, it makes the molding of the lower insulating component 300 more difficult. In some battery cells, the sidewall of the protrusion 320 connects to other structures, such as an insulating film. In this case, an excessively large W3 can cause the connection between the protrusion 320 and the insulating film to crack easily. Simultaneously, an excessively large W3 results in the venting channel 330 on the lower insulating component 300 being too small, making the cross-sectional area for gas flow in the venting channel 330 too small, leading to excessively low exhaust efficiency of the battery cell.

[0086] After thermal runaway occurs in a single battery cell, the high-temperature gas flows into the two venting channels 330 of the same protrusion 320. The portion between two adjacent venting channels 330 will exchange heat with the high-temperature gas in both venting channels 330 at the same time. If W3 is too small, there will be less material in this part. The distance between the portion between two adjacent venting channels 330 and the gas heat exchange surface will be closer, making this part more prone to thermal softening. This will make both venting channels 330 more prone to deformation, which will have a significant adverse effect on the exhaust efficiency of the battery cell.

[0087] To avoid the above problems, in this embodiment, W3 is designed as W0×1 / 4≤W3≤W0×1 / 2. On the one hand, this can ensure the structural strength of the sidewall of the protrusion 320 and ensure that the protrusion 320 can be reliably connected to the insulating film. On the other hand, it can reduce the risk of deformation of the part between two adjacent ventilation channels 330 of the same protrusion 320 and ensure that the gas can pass smoothly through the ventilation channel 330.

[0088] like Figure 2 and Figure 3In some embodiments, along the thickness direction of the battery cell, the minimum distance between the reinforcing structure 340 and the sidewall of the protrusion 320 is W2, where W2 ≥ 5 mm.

[0089] For example, W2 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0090] It should be noted that when there is a raised inner cavity 321 between the ventilation channel 330 and the side wall of the protrusion 320, and a reinforcing structure 340 is provided in the raised inner cavity 321, the distance between the reinforcing structure 340 and the side wall of the protrusion 320 is the distance between the reinforcing structure 340 in the raised inner cavity 321 and the side wall of the protrusion 320.

[0091] When the ventilation channel 330 and the side wall of the protrusion 320 are not provided with a protruding inner cavity 321, or when a protruding inner cavity 321 is provided but a reinforcing structure 340 is not provided in the protruding inner cavity 321, the distance between the reinforcing structure 340 and the side wall of the protrusion 320 is the distance between the reinforcing structure 340 in the ventilation channel 330 and the side wall of the protrusion 320.

[0092] In a single battery cell, the distance between the reinforcing structure 340 and the sidewall of the protrusion 320 can have several different values, the minimum of which is W2.

[0093] If W2 is too small, the distance between the sidewall of the reinforcing structure 340 and the adjacent protrusion 320 along the thickness direction of the battery cell will be too small. On the one hand, this will result in less material in the part between the two of the lower insulating member 300, resulting in lower structural strength. In some battery cells, the sidewall of the protrusion 320 will be connected to other structures, such as an insulating film. In this case, if W2 is too small, the structural strength between the two of the two will decrease, reducing the reliability of the connection between the protrusion 320 and other structures. On the other hand, it will also make the molding of the lower insulating member 300 more difficult.

[0094] To avoid the above problems, in this embodiment, W2 is designed to be W2≥5mm, which can ensure the structural strength of the sidewall of the protrusion 320, ensure that the protrusion 320 can be reliably connected to the insulating film, and at the same time help to reduce the molding difficulty of the lower insulating part 300, improve the molding quality, and thus make the overall structural strength of the lower insulating part 300 greater, reducing the risk of deformation.

[0095] like Figure 4 In some embodiments, the electrode assembly 400 includes an electrode body 410 and tabs 420 extending from the electrode body 410; the cover plate body 200 is connected to at least one terminal assembly 700, the same terminal assembly 700 is electrically connected to n tabs 420, and the same protrusion 320 is provided with m ventilation channels 330, where n≤m≤2×n.

[0096] For example, the terminal assembly 700 may include an electrode terminal 710, and the tab 420 may be directly electrically connected to the electrode terminal 710. Alternatively, the electrode assembly 400 may include an electrode terminal 710 and an adapter 720, with the tab 420 electrically connected to the adapter 720 and the adapter 720 electrically connected to the electrode terminal 710.

[0097] It should be noted that each electrode body 410 has one positive tab and one negative tab. Each electrode body 410 may include stacked positive and negative electrode plates. Understandably, the positive and negative tabs from each electrode body 410 can be one or more tabs from one or more layers of electrode plates. The term "one" in "one positive tab" should be understood to include the above, and not to mean that "one" positive tab refers only to one layer of tabs. The same interpretation applies to "one" in "one negative tab." All positive tabs in a single battery cell are electrically connected to the same electrode terminal 710, which serves as the positive terminal of the battery cell. Similarly, all negative tabs are electrically connected to the same electrode terminal 710, which serves as the negative terminal of the battery cell. In other words, the number of tabs 420 electrically connected to the same terminal assembly 700 is the same as the number of electrode assemblies 400 in the battery cell.

[0098] The n tabs 420 electrically connected to the same terminal assembly 700 can be divided into two or more groups. Each group may include one, two, or more tabs 420, and the tabs 420 within the same group are stacked and tightly connected. For example, when the same terminal assembly 700 is electrically connected to four tabs 420, the four tabs 420 can be grouped in pairs, with the two tabs 420 within each group stacked and tightly connected. When the same terminal assembly 700 is electrically connected to six tabs 420, the six tabs 420 can be grouped in pairs, with the two tabs 420 within each group stacked and tightly connected; alternatively, they can be grouped in threes, with the three tabs 420 within each group stacked and tightly connected.

[0099] In a single battery cell, the number of electrode assemblies 400 disposed within the containment space 500 is related to the size of the containment space 500 and the capacity of the single battery cell. A greater number of electrode assemblies 400 implies a larger containment space 500 and consequently, a larger battery cell capacity. Consequently, in the event of thermal runaway, the velocity and total amount of gas generated inside the battery cell will also be greater.

[0100] Compared to the number of electrode components 400 in a single battery cell, if the number of venting channels 330 is too small, the dimension of a single venting channel 330 along the thickness direction of the battery cell (i.e., the dimension between the two channel sidewalls 333 of the venting channel 330 along the thickness direction of the battery cell, hereinafter referred to as the width of the venting channel 330) should not be designed to be too large (for the reasons mentioned above, which will not be repeated here). In this case, the ability of the lower insulating component 300 to vent through the venting channel 330 will be too poor, resulting in a low venting efficiency of the battery cell. This will also increase the risk of a safety accident caused by untimely pressure relief when the battery cell experiences thermal runaway.

[0101] Because the dimensions of the protrusion 320 along the thickness direction of the battery cell are limited, and a certain distance is required between adjacent venting channels 330, if the number of venting channels 330 is too large, the corresponding amount of space between adjacent venting channels 330 will also be too large. This space between adjacent venting channels 330 will occupy too much space in the thickness direction of the protrusion 320 along the battery cell, resulting in a small actual area on the protrusion 320 for gas flow. At the same time, an excessive number of venting channels 330 also means that the width of a single venting channel 330 will be too small, making the molding of the lower insulating component 300 more difficult.

[0102] To avoid the aforementioned problems, this embodiment designs m to be n≤m≤2×n. On the one hand, this ensures that the gas flow rate through the lower insulating component 300 can adapt to different battery cells. When a battery cell experiences thermal runaway, it ensures that the high-temperature gas inside the battery cell can be discharged in time, guaranteeing the safety performance of the battery cell. On the other hand, when the number of ventilation channels 330 meets the above conditions, the number of channel sidewalls 333 is also sufficient, providing a sufficient structural foundation for setting up the reinforcing structure 340. This is beneficial to improving the overall structural strength of the lower insulating component 300 and reducing the risk of deformation of the lower insulating component 300.

[0103] Figure 5 A partial cross-sectional view of the battery cell with the third structure is shown.

[0104] like Figure 5 Within the same protrusion 320, the location and number of ventilation channels 330 can correspond to the number and location of electrode assemblies 400.

[0105] Specifically, Figure 5 The battery cell includes four electrode assemblies 400, and four corresponding venting channels 330 are provided on the protrusion 320. Along the height direction of the battery cell, each venting channel 330 is approximately aligned with the electrode body 410. This arrangement helps to shorten the flow path of high-temperature gas from the electrode body 410 to the venting channel 330, thereby helping to improve the exhaust efficiency of the battery cell.

[0106] like Figure 2 and Figure 4 In some embodiments, the protrusion 320 has a bottom surface away from the insulating body 310, the lower insulating member 300 has a top surface close to the cover plate body 200, and the ventilation channel 330 is located between the top surface of the lower insulating member 300 and the bottom surface of the protrusion 320 along the height direction of the battery cell.

[0107] In this embodiment, the ventilation channel 330 has solid material forming the lower insulating member 300 above, below and on both sides, which makes the structural strength of the area near the ventilation channel 330 greater and helps to reduce the risk of deformation of the lower insulating member 300, especially the area near the ventilation channel 330.

[0108] like Figure 2 and Figure 5 In some embodiments, the ventilation channel 330 extends along the height direction of the battery cell to the top surface of the lower insulator 300.

[0109] Since the dimensions of the protrusion 320 along the height direction of the battery cell are limited, extending the venting channel 330 to the top surface of the lower insulating member 300 can greatly increase the cross-sectional area of ​​the venting channel 330, which helps to increase the gas flow rate through the venting channel 330 per unit time, thereby improving the exhaust efficiency and safety performance of the battery cell.

[0110] Figure 6 A partial cross-sectional schematic diagram of the lower insulating component 300 and related structural components of the battery cell is shown.

[0111] like Figure 2 and Figure 6 In some embodiments, the reinforcing structure 340 includes a top exposed portion 341, which protrudes from the side of the lower insulating member 300 away from the electrode assembly 400. The bottom surface of the cover plate body 200 has a positioning groove 210 corresponding to the top exposed portion 341, and the cover plate body 200 is connected to the top exposed portion 341 through the positioning groove 210.

[0112] For example, the cross-sectional shape of the top exposed portion 341 of the reinforcing structure 340 (unless otherwise specified, the cross-section of the reinforcing structure 340 refers to the cross-section of the reinforcing structure 340 perpendicular to the height direction of the battery cell) can be the same as the cross-sectional shape of the portion disposed within the protrusion 320, and their central axes are collinear.

[0113] For example, the exposed top portion 341 can be connected to the insulating body 310 by means of integral molding, plugging, snap-fitting, gluing or hot pressing.

[0114] For example, the exposed top portion 341 can be connected to the cover plate body 200 by means of snap-fit, adhesive or heat fusion through the positioning groove 210.

[0115] In this embodiment, the reinforcing structure 340 can be connected to the cover plate body 200 through the top exposed portion 341, and the structural strength of the lower insulating member 300 near the top exposed portion 341 can be further improved by the supporting effect of the cover plate body 200.

[0116] At the same time, it can also prevent the lower insulating component 300 from sliding and misaligning with the cover plate body 200 when the battery cell thermally runs away, which would cause the solid part of the insulating body 310 to block the explosion-proof valve 600 from below, blocking the space below the explosion-proof valve 600, and causing the gas in the containment space 500 to be unable to be discharged and depressurized smoothly through the explosion-proof valve 600.

[0117] When there is more than one top exposed part 341, the cooperation between the multiple top exposed parts 341 and the cover plate body 200 can also improve the connection strength between the lower insulating member 300 and the cover plate body 200. Even if the top exposed part 341 is affected by heat and airflow when the battery cell experiences thermal runaway, it is not easy for the lower insulating member 300 and the cover plate body 200 to slip or twist.

[0118] Combination Figure 2 It can be seen that the structure of the cover plate body 200 along the first direction is roughly symmetrical with respect to the central axis. The outer shape of the insulating body 310 and the protrusion 320 of the lower insulating member 300 is also roughly symmetrical. When assembling the lower insulating member 300 and the cover plate body 200, the two ends of the lower insulating member 300 along the first direction may be installed in reverse with the two ends of the cover plate body 200 along the first direction, which cannot guarantee the fit between the two and may adversely affect the electrical performance of the battery cell.

[0119] To solve the above problems, such as Figure 2 and Figure 3 In some embodiments, the protrusion 320 includes a first protrusion 322 and a second protrusion 323, the first protrusion 322 and the second protrusion 323 being spaced apart along a first direction; the ventilation channel 330 includes a first channel 334 disposed on the first protrusion 322 and a second channel 335 disposed on the second protrusion 323; the reinforcing structure 340 is asymmetrically disposed relative to the center point of the lower insulating member 300.

[0120] The center point of the lower insulating member 300 can be the center point of the projection of the lower insulating member 300 along the height direction of the battery cell, such as: when the projection of the lower insulating member 300 is a circle, the center point can be the center of the circle; when the projection is a rectangle, the center point can be the intersection of the diagonals of the rectangle; when the projection is a symmetrical figure, the center point can be the center point of one of the axes of symmetry or the intersection of multiple axes of symmetry; when the projection is other figures, the center point can be the centroid of the figure, which will not be elaborated here.

[0121] Since the center point of the reinforcing structure 340 is asymmetrical relative to the center point of the lower insulating member 300, after the lower insulating member 300 is rotated 180° along its top surface, the exposed top portion 341 of the reinforcing structure 340 on the lower insulating member 300 can no longer cooperate with the positioning groove 210 of the cover plate body 200. That is, the exposed top portion 341 of the reinforcing structure 340 on the lower insulating member 300 and the positioning groove 210 of the cover plate body 200 have only one relative position to achieve a fitting connection, which can play a role in preventing incorrect installation when assembling battery cells.

[0122] For a configuration in which the reinforcing structure 340 is asymmetrical relative to the center point of the lower insulating member 300, the structure may include the following embodiments.

[0123] like Figure 2 and Figure 3 In some embodiments, each first channel 334 is provided with a reinforcing structure 340, and at least one second channel 335 is not provided with a reinforcing structure 340.

[0124] by Figure 3 The structure and orientation shown are used as examples for explanation. Figure 3 Both first channels 334 within the first protrusion 322 are equipped with reinforcing structures 340, while the upper second channel 335 within the second protrusion 323 lacks a reinforcing structure 340. This results in the reinforcing structure 340 being asymmetrical relative to the center point of the lower insulating member 300, and consequently, the exposed top portion 341 is also asymmetrical, which helps prevent incorrect assembly of battery cells.

[0125] like Figure 2 and Figure 3 In some embodiments, a reinforcing structure 340 is provided in the first channel 334 and the second channel 335 respectively, and the W1 of at least one first channel 334 is different from the W1 of any second channel 335.

[0126] When at least one W1 of the first channel 334 is different from each W1 of the second channel 335, the reinforcing structure 340 provided by the first protrusion 322 and the reinforcing structure 340 provided by the second protrusion 323 are necessarily asymmetrical with respect to the center point of the lower insulating member 300. Correspondingly, the top exposed portion 341 is also asymmetrical, which can play a role in preventing incorrect assembly when assembling battery cells.

[0127] like Figure 2 and Figure 3 In some embodiments, a reinforcing structure 340 is provided in the first channel 334 and the second channel 335 respectively; the reinforcing structure 340 provided in the first channel 334 extends into the protruding cavity 321 of the first protrusion 322; at least one reinforcing structure 340 provided in the second channel 335 does not extend into the protruding cavity 321 of the second protrusion 323.

[0128] Still with Figure 3 The structure and orientation shown are used as examples for illustration. Figure 3 The reinforcing structures 340 in both first channels 334 extend into the protruding inner cavity 321, and their cross-sectional shape is circular. However, the reinforcing structures 340 in the second channel 335 do not extend into the protruding inner cavity 321, and their cross-sectional shape is semi-circular. Because the cross-sectional shapes of the reinforcing structures 340 in the first channel 334 and the second channel 335 are different, the reinforcing structures 340 on the first protrusion 322 and the second protrusion 323 are necessarily asymmetrical with respect to the center point of the lower insulating member 300. Correspondingly, the top exposed portion 341 is also asymmetrical, which can prevent incorrect assembly when assembling battery cells.

[0129] like Figure 2 and Figure 3 In some embodiments, a reinforcing structure 340 is provided in the first channel 334 and the second channel 335 respectively, and the L1 of at least one first channel 334 is different from the L1 of any second channel 335.

[0130] When at least one L1 of the first channel 334 is different from each L1 of the second channel 335, the reinforcing structure 340 provided by the first protrusion 322 and the reinforcing structure 340 provided by the second protrusion 323 are necessarily asymmetrical with respect to the center point of the lower insulating member 300. Correspondingly, the top exposed portion 341 is also asymmetrical, which can play a role in preventing incorrect assembly when assembling battery cells.

[0131] like Figure 2 and Figure 3In some embodiments, a reinforcing structure 340 is provided in the first channel 334 and the second channel 335 respectively; the number of reinforcing structures 340 provided in the first channel 334 is different from the number of reinforcing structures 340 provided in the second channel 335.

[0132] Still with Figure 3 The structure and orientation shown are used as examples for illustration. Figure 3 The total number of reinforcing structures 340 disposed in the two first channels 334 is 3, and the total number of reinforcing structures 340 disposed in the two second channels 335 is 2. This makes the reinforcing structures 340 disposed in the first protrusion 322 and the reinforcing structures 340 disposed in the second protrusion 323 asymmetrical with respect to the center point of the lower insulating member 300. Correspondingly, the top exposed part 341 is also asymmetrical, which can play a role in preventing incorrect assembly when assembling battery cells.

[0133] Based on the same inventive concept and in conjunction with the description of the battery cells in the above embodiments, this embodiment provides a battery that has the corresponding technical effects of the battery cells in the above embodiments, which will not be repeated here.

[0134] A battery comprising a battery cell as described in the various embodiments above.

[0135] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0136] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0137] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0138] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0139] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0140] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; A housing having at least one open end; The cover plate body is connected to the opening end and together with the housing to form a receiving space for accommodating the electrode assembly; the cover plate body is connected to an explosion-proof valve; The lower insulating component includes an insulating body connected to the surface of the cover plate body near the electrode assembly. The surface of the insulating body near the electrode assembly has a protrusion protruding toward the electrode assembly. The protrusion has a ventilation channel extending along the length of the cover plate body. The inner surface of the ventilation channel has a reinforcing structure protruding toward the inner side of the ventilation channel.

2. The battery cell according to claim 1, characterized in that, The preset direction of the ventilation channel is perpendicular to the extension direction of the ventilation channel; Along the preset direction of the ventilation channel, the protrusion is provided with a protrusion cavity isolated on at least one side of the ventilation channel, and the reinforcing structure extends into the protrusion cavity along the preset direction of the ventilation channel; And / or, The ventilation channel has an air inlet located upstream and an air outlet located downstream. In the same ventilation channel, along the extension direction of the ventilation channel, the distance from the air inlet to the air outlet is L, and the distance between the reinforcing structure and the air inlet is L1, where 0 < L1 ≤ L × 1 / 2.

3. The battery cell according to claim 1, characterized in that, The ventilation channel has two channel sidewalls, which are spaced apart along the thickness direction of the battery cell, and the reinforcing structure is disposed on at least one of the two channel sidewalls.

4. The battery cell according to claim 3, characterized in that, The dimension of the lower insulating member along the thickness direction of the battery cell is W0; In the ventilation channel, the distance between the location of the reinforcing structure and the thickness direction of the battery cell is W1, where W0×1 / 10≤W1≤W0×4 / 5; and / or, The same protrusion is provided with at least two ventilation channels, the at least two ventilation channels extend in the same direction and are spaced apart along the thickness direction of the battery cell, and the distance between two adjacent ventilation channels is W3, W0×1 / 4≤W3≤W0×1 / 2.

5. The battery cell according to claim 1, characterized in that, Along the thickness direction of the battery cell, the minimum distance between the reinforcing structure and the protruding sidewall is W2, where W2 ≥ 5 mm.

6. The battery cell according to claim 1, characterized in that, The electrode assembly includes an electrode body and tabs extending from the electrode body; the cover plate body is connected to at least one terminal assembly, the same terminal assembly is electrically connected to n tabs, and the same protrusion is provided with m ventilation channels, where n≤m≤2×n.

7. The battery cell according to claim 1, characterized in that, The reinforcing structure includes a top exposed portion that protrudes from the side of the lower insulating member away from the electrode assembly. A positioning groove corresponding to the top exposed portion is formed on the surface of the cover plate body facing the electrode assembly. The cover plate body is connected to the top exposed portion through the positioning groove.

8. The battery cell according to claim 7, characterized in that, The protrusions include a first protrusion and a second protrusion, which are spaced apart along the length of the cover plate body; the ventilation channel includes a first channel disposed on the first protrusion and a second channel disposed on the second protrusion; the reinforcing structure is asymmetrically disposed with respect to the center point of the lower insulating member.

9. The battery cell according to claim 8, characterized in that, The first channel and the second channel each have the aforementioned reinforcing structure provided within them, and at least one of the W1 values ​​of the first channel is different from the W1 value of any one of the second channels; or, The first channel and the second channel are each provided with the reinforcing structure. The reinforcing structure provided in the first channel extends into the inner cavity of the first protrusion. At least one reinforcing structure provided in the second channel does not extend into the inner cavity of the second protrusion. or, The first channel and the second channel are each provided with the reinforcement structure, and at least one L1 of the first channel is different from the L1 of any of the second channels.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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