Secondary battery and electric device

Abstract

The application discloses a secondary battery and an electric device, comprising: a shell, an electrode assembly, a top cover sheet, an insulating piece and a protruding piece, the top cover sheet is connected with the shell, and the top cover sheet is provided with a liquid injection hole; the insulating piece is connected with one side of the top cover sheet facing the electrode assembly; the protruding piece comprises an extension part and a blocking part, the extension part is connected with one side of the insulating piece away from the top cover sheet; the blocking part is connected with one side of the extension part away from the insulating piece, and the orthogonal projection of the blocking part on the top cover sheet covers at least part of the liquid injection hole; at least one flow guide hole is arranged on the extension part, and the flow guide hole is communicated with the liquid injection hole; the sum of the areas of the at least one flow guide hole is S1 mm 2 , the area of the liquid injection hole is S2 mm 2 , and the following condition is met: 1≤S1 / S2≤4. After the secondary battery meets the range of 1≤S1 / S2≤4, the strength of the protruding piece is improved, and the electrolyte injection efficiency is further improved, so that the production yield of the secondary battery is significantly increased.

Description

[0001] This application is a divisional application of the invention patent application with application number 202411059056.4, application date August 2, 2024, entitled "Secondary Battery and Power Consumption Device". Technical Field

[0002] This application belongs to the field of battery technology, specifically relating to secondary batteries and electrical devices. Background Technology

[0003] The top cover assembly of a secondary battery has an injection port. During electrode assembly production, electrolyte needs to be injected into the electrode assembly through this port. However, when the injection pressure and injection speed are too high, the force of the electrolyte directly impacting the separator on the electrode assembly also increases, causing the separator to collapse and resulting in a short circuit between the positive and negative electrodes, leading to a decrease in battery yield. Typically, the top cover assembly has a protrusion to mitigate electrolyte impact, but the structure and position of this protrusion directly affect the injection efficiency, and if the protrusion itself is too weak, it can be broken by the electrolyte and fail to provide a buffering effect. Summary of the Invention

[0004] Purpose of the invention: This application provides a secondary battery and power supply device, which solves the problems of low liquid injection efficiency and easy damage to the boss by controlling the structure and position of the boss on the top cover assembly.

[0005] Technical solution: This application provides a secondary battery, comprising:

[0006] A housing having a receiving cavity;

[0007] An electrode assembly disposed in the receiving cavity;

[0008] A top cover sheet is connected to the housing and seals the receiving cavity. The top cover sheet has a thickness direction X and is provided with an injection hole that penetrates the top cover sheet along the thickness direction X.

[0009] An insulating component is disposed in the receiving cavity and connected to the top cover plate on the side facing the electrode assembly. The insulating component has a through hole that penetrates the insulating component along the thickness direction X and communicates with the liquid injection hole.

[0010] A protrusion includes an extension and a blocking portion. The extension is connected to the side of the insulating member away from the top cover plate, and the extension surrounds the through hole. The blocking portion is connected to the side of the extension away from the insulating member, and the blocking portion covers at least a portion of the injection hole along the thickness direction X on the top cover plate. The extension has at least one guide hole, which communicates with the injection hole.

[0011] Wherein, the total area of ​​the at least one guide hole is S1 mm. 2 The area of ​​the injection hole is S2mm. 2 The following condition is met: 1≤S1 / S2≤4.

[0012] In some embodiments, the thickness of the extension is H1 mm, and the secondary battery further satisfies: 1.2 ≤ H1 × S1 ≤ 120.

[0013] In some embodiments, the secondary battery further satisfies: 2.4 ≤ H1 × S1 ≤ 30.

[0014] In some embodiments, the secondary battery further satisfies at least one of the following characteristics:

[0015] a) 0.6 ≤ H1 ≤ 2;

[0016] b)2≤S1≤60.

[0017] In some embodiments, the insulating member includes an insulating body portion and first protrusions disposed on both sides of the insulating body portion, the first protrusions being connected to the side of the insulating body portion facing the electrode assembly.

[0018] The insulating body portion has a first surface in the thickness direction X that faces and is connected to the top cover sheet; the first protrusion has a second surface in the thickness direction X that faces the electrode assembly; and the blocking portion has a third surface in the thickness direction X that faces the electrode assembly. The first surface and the second surface have a maximum distance H mm in the thickness direction X, and the first surface and the third surface have a maximum distance H3 mm in the thickness direction X, satisfying: H3 ≤ H2.

[0019] In some embodiments, the secondary battery further satisfies at least one of the following characteristics:

[0020] c) H3 ≤ H2 - 1;

[0021] d) 1 ≤ H2 ≤ 10;

[0022] e)0.5≤H3≤8.

[0023] In some embodiments, the top cover includes a top cover body and a second protrusion; the top cover body has a fourth surface and a fifth surface facing away from each other in the thickness direction X, the fourth surface facing the electrode assembly and connected to the first surface; the second protrusion is connected to the fourth surface and disposed around the injection hole, the second protrusion being located within the through hole; the second protrusion has a sixth surface facing the electrode assembly in the thickness direction X; wherein the first surface and the sixth surface have a maximum distance H4 mm in the thickness direction X, satisfying: H4 < H3.

[0024] In some embodiments, the secondary battery further satisfies at least one of the following characteristics:

[0025] f)H3≥H4+1;

[0026] g)0.4<H4≤3.

[0027] In some embodiments, the insulating body portion further has a seventh surface facing the electrode assembly in the thickness direction X, the seventh surface and the first surface being disposed opposite to each other in the thickness direction X;

[0028] The extension includes a plurality of extension segments arranged around the through hole; one end of each extension segment is connected to the seventh surface, and the other end of each extension segment away from the seventh surface is connected to the blocking portion; the through hole has a radial direction Y perpendicular to the thickness direction X, the extension segment has an eighth surface away from the through hole and a ninth surface close to the through hole in the radial direction Y, and the extension segment also has a tenth surface located at the eighth surface and the ninth surface and connected to the eighth surface and the ninth surface respectively;

[0029] The secondary battery also includes:

[0030] A first reinforcing member is connected to the tenth surface of the adjacent extension segment, and the first reinforcing member, the extension segment, and the blocking portion together form the flow guide hole; or

[0031] The first reinforcing member is connected to the ninth surface of any two of the extended sections, and the extended sections, the blocking portion, and the insulating body portion together form the flow guide hole.

[0032] In some embodiments, the insulating body portion further has a seventh surface facing the electrode assembly in the thickness direction X, the seventh surface and the first surface being disposed opposite to each other in the thickness direction X;

[0033] The extension includes a plurality of extension segments arranged around the through hole, and the extension segments, the blocking portion and the insulating body portion together form the flow guide hole; one end of the extension segment is connected to the seventh surface, and the other end of the extension segment away from the seventh surface is connected to the blocking portion; the through hole has a radial direction Y perpendicular to the thickness direction X, and the extension segment has an eighth surface away from the through hole in the radial direction Y;

[0034] The secondary battery also includes:

[0035] The second reinforcing member is disposed within the receiving cavity and is connected to the seventh surface and the eighth surface, respectively.

[0036] In some embodiments, the extension is provided with a plurality of flow guide holes, which are spaced apart circumferentially along the extension.

[0037] In some embodiments, the extension includes a first connecting section and a first bending section, the first connecting section being connected to the seventh surface, the first bending section being connected to the side of the first connecting section away from the first bending section, and the side of the first bending section away from the first connecting section being connected to the blocking portion; wherein, the first reinforcing member, the first connecting section, the first bending section, and the blocking portion together form the guide hole.

[0038] In some embodiments, the blocking portion includes a second connecting segment, a second bending segment, and a third connecting segment; the second connecting segment is connected to the end of the extension segment away from the seventh surface, the second bending segment is connected to the side of the second connecting segment away from the extension segment, and the third connecting segment is connected to the side of the second bending segment away from the second connecting segment; wherein, the first reinforcing member, the extension segment, the second connecting segment, the second bending segment, and the third connecting segment together form the guide hole.

[0039] In some embodiments, this application also provides an electrical device including the aforementioned secondary battery, the secondary battery being used to supply power to the electrical device.

[0040] Beneficial Effects: A secondary battery according to an embodiment of this application includes: a housing having a receiving cavity; an electrode assembly disposed in the receiving cavity; a top cover plate connected to the housing and sealing the receiving cavity, the top cover plate having a thickness direction X, and a liquid injection hole penetrating the top cover plate along the thickness direction X; an insulating member disposed in the receiving cavity and connected to the side of the top cover plate facing the electrode assembly, the insulating member having a through hole penetrating the insulating member along the thickness direction X and communicating with the liquid injection hole; a protrusion including an extension and a blocking portion, the extension being connected to the side of the insulating member away from the top cover plate and surrounding the through hole; the blocking portion being connected to the side of the extension away from the insulating member, and the orthogonal projection of the blocking portion along the thickness direction X on the top cover plate covering at least a portion of the liquid injection hole; the extension having at least one guide hole communicating with the liquid injection hole; wherein, the total area of ​​the at least one guide hole is S1 mm. 2 The area of ​​the injection hole is S2 mm. 2 The following conditions must be met: 1 ≤ S1 / S2 ≤ 4. This application, by setting a protrusion directly opposite the injection hole, prevents the electrolyte from directly impacting the electrode assembly. Instead, the electrolyte is diverted to the side and flows out through the guide hole into the casing, thus avoiding the problem of diaphragm collapse and short-circuiting of the positive and negative electrodes. When the range of 1 ≤ S1 / S2 ≤ 4 is met, the strength of the protrusion is improved, and the electrolyte injection efficiency is further enhanced, resulting in a significant increase in the yield of secondary battery production.

[0041] The electrical device in this application embodiment may include all the technical features and beneficial effects of the above-mentioned secondary battery, which will not be repeated here. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the secondary battery structure provided in an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of an insulating component and a protrusion provided in an embodiment of this application;

[0045] Figure 3 for Figure 2 A cross-sectional schematic diagram;

[0046] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle;

[0047] Figure 5 for Figure 4 A cross-sectional schematic diagram of the central protrusion;

[0048] Figure 6 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0049] Figure 7 for Figure 6 A cross-sectional schematic diagram;

[0050] Figure 8 for Figure 6 A magnified view of a portion of point B in the middle;

[0051] Figure 9 for Figure 8 A cross-sectional schematic diagram of the central protrusion;

[0052] Figure 10 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0053] Figure 11 for Figure 10 Enlarged schematic diagram of the central protrusion;

[0054] Figure 12 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0055] Figure 13 for Figure 12 Enlarged schematic diagram of the central protrusion;

[0056] Figure 14 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0057] Figure 15 for Figure 14 Enlarged schematic diagram of the central protrusion;

[0058] Figure 16 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0059] Figure 17 for Figure 16 Enlarged schematic diagram of the central protrusion;

[0060] Figure 18 This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0061] Figure 19 for Figure 18 Enlarged schematic diagram of the central protrusion;

[0062] Figure 20This is a schematic diagram of another insulating element and protrusion structure provided in an embodiment of this application;

[0063] Figure 21 for Figure 20 Enlarged schematic diagram of the central protrusion;

[0064] Reference numerals: 10-Housing shell, 101-Receiving cavity, 20-Electrode assembly, 30-Top cover plate, 301-Injection hole, 302-Top cover body, 303-Second protrusion, 3021-Fourth surface, 3022-Fifth surface, 3031-Sixth surface, 40-Insulator, 401-Through hole, 402-Insulating body, 4021-First surface, 4022-Seventh surface, 403-First protrusion, 4031-Second surface 50 - Protrusion, 501 - Extension, 5010 - Extension section, 5011 - Eighth surface, 5012 - Ninth surface, 4013 - Tenth surface, 5014 - First connecting section, 5015 - First bending section, 502 - Blocking part, 5021 - Third surface, 5022 - Second connecting section, 5023 - Second bending section, 5024 - Third connecting section, 503 - Guide hole, 60 - First reinforcing member, 70 - Second reinforcing member. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0066] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0067] As a key component of power batteries, the top cover structure has a significant impact on the battery's energy density, economy, and safety. The top cover is equipped with an injection port through which electrolyte is injected into the casing during battery production. Currently, the industry uses high injection pressure and speed to improve battery production efficiency. However, when the injection pressure and speed are too high, the force of the electrolyte directly impacting the top separator of the bare electrode assembly also increases, causing the separator to collapse and resulting in short circuits between the positive and negative electrodes, thus reducing the battery's yield. Typically, the top cover assembly has a protrusion to mitigate electrolyte impact, but the structure and position of this protrusion directly affect injection efficiency, and if the protrusion itself is too weak, it can be broken by the electrolyte and fail to provide a buffering effect.

[0068] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment provides a secondary battery, including: a housing 10, an electrode assembly 20, a top cover 30, an insulating member 40, and a protrusion 50; the housing 10 has a receiving cavity 101; the electrode assembly 20 is disposed in the receiving cavity 101; the top cover 30 is connected to the housing 10 and covers the receiving cavity 101, the top cover 30 has a thickness direction X, and the top cover 30 is provided with an injection hole 301, which penetrates the top cover 30 along the thickness direction X; the insulating member 40 is disposed in the receiving cavity 101, and the insulating member 40 is connected to the side of the top cover 30 facing the electrode assembly 20, the insulating member 40 is provided with a through hole 401, and the through hole 401 extends along the thickness direction X. The through hole 40 is penetrated in the X direction and communicates with the injection hole 301; the protrusion 50 includes an extension 501 and a blocking portion 502. The extension 501 is connected to the side of the insulating member 40 away from the top cover plate 30, and the extension 501 is arranged around the through hole 401; the blocking portion 502 is connected to the side of the extension 501 away from the insulating member 40, and the orthogonal projection of the blocking portion 502 along the thickness direction X on the top cover plate 30 covers at least a portion of the injection hole 301; the extension 501 is provided with at least one guide hole 503, which communicates with the injection hole 301; wherein, the total area of ​​the at least one guide hole 503 is S1 mm. 2 The area of ​​injection hole 301 is S2 mm. 2 The following condition is met: 1≤S1 / S2≤4.

[0069] In some embodiments, the ratio of S1 / S2 can be any one of 1, 1.5, 2, 2.5, 3, 3.5, 4, or a range between any two values. If the ratio of S1 / S2 is too small, since the area of ​​the guide hole 503 is smaller than the area of ​​the injection hole 301, the guide hole 503 has a lower electrolyte passage capacity than the injection hole 301, becoming a bottleneck for the injection speed and reducing the injection efficiency. If the ratio of S1 / S2 is too large, the area of ​​the guide hole 503 is too large, resulting in a relatively smaller area of ​​the remaining part of the extension 501, which leads to a decrease in the strength of the protrusion 50, making it more susceptible to breakage and failure due to the impact force of electrolyte injection.

[0070] In some embodiments, the thickness of the extension 501 is H1 mm, and the secondary battery further satisfies: 1.2≤H1×S1≤120.

[0071] It should be noted that the through hole 401 has a radial direction Y perpendicular to the thickness direction X. When the thickness of the extension 501 is equal everywhere, the thickness of the extension 501 is equal to the dimension in the radial direction Y of the through hole. When the thickness of the extension is not uniform, the minimum thickness of the extension 501 is taken as the thickness dimension of the extension 501.

[0072] It should be noted that in the secondary battery of this embodiment, the insulating member 40 can be understood as the lower plastic, used for insulation between the top cover plate 30 and the electrode assembly 20; the liquid injection hole 301 on the top cover plate 30 is used for injecting electrolyte, and the through hole 401 on the insulating member 40 communicates with the liquid injection hole 301 for the electrolyte to enter the receiving cavity 101; the protrusion 50 is disposed on the side of the insulating member 40 facing the electrode assembly 20, wherein the extension 501 of the protrusion 50 is disposed around the through hole 401 for defining the protrusion. The protruding member 50 is positioned relative to the insulating member 40; the blocking portion 502, projected along the thickness direction X onto the top cover plate 30, covers at least a portion of the injection hole 301. This ensures that at least a portion of the blocking portion 502 is directly opposite the injection hole 301, thereby achieving a buffering effect on the injected electrolyte. Furthermore, a guide hole 503 is provided on the extension portion 501, further diverting the electrolyte and allowing it to enter the housing 10 through other paths to interact with the electrode assembly 20. It is understood that by providing the protruding member 50 directly opposite the injection hole 301, this application prevents the electrolyte from directly impacting the electrode assembly 20, instead diverting it to the side and flowing out through the guide hole 503 into the housing 10, thus avoiding the problem of diaphragm collapse and short-circuiting of the positive and negative electrodes. Furthermore, H1 and S1 further define the thickness of the extension 501 in the radial direction Y and the area of ​​the guide hole 503. Specifically, H1×S1 reflects the volume of the guide hole 503. If the value of H1×S1 is too small, it indicates that the volume of the guide hole 503 is too small, which reduces the electrolyte injection efficiency. If the value of H1×S1 is too large, it indicates that the volume of the guide hole 503 is too large, resulting in a reduction in the volume of the remaining portion of the extension 501, which weakens the strength of the protrusion 50 and makes it more susceptible to breakage due to the impact force of electrolyte injection. Therefore, when the range of 1.2≤H1×S1≤120 is satisfied, the strength of the protrusion 50 is improved while the electrolyte injection efficiency is further enhanced, resulting in a significant increase in the yield rate of secondary battery production.

[0073] It should be further noted that the thickness direction X and the radial direction Y are respectively... Figure 3 and Figure 4 The direction indicated by the middle arrow is the reference point; although not shown in other attached diagrams, it is consistent with... Figure 3 and Figure 4 The directions indicated are consistent.

[0074] In some embodiments, the value of H1×S1 can be any one of 1.2, 1.5, 1.8, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 120 or a range between any two values.

[0075] In some embodiments, the H1×S1 secondary battery further satisfies: 2.4≤H1×S1≤30. That is, H1×S1 can be any one value or a range between any two values ​​from 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 28, 30.

[0076] In some embodiments, the secondary battery further satisfies: 0.6 ≤ H1 ≤ 2; for example, the value of H1 mm can be any one of 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2, or a range between any two values. When H1 mm satisfies the above range, the structural strength of the protrusion 50 can be further guaranteed.

[0077] In some embodiments, the secondary battery further satisfies: 2 ≤ S1 ≤ 60; for example, S1 mm 2 The value can be any one of the following: 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, or a range between any two values. When S1 mm 2 Meeting the above range can further maintain a high electrolyte injection efficiency.

[0078] In some embodiments, see further. Figure 2 , Figure 3 and Figure 5 The insulating member 40 includes an insulating body portion 402 and first protrusions 403 disposed on both sides of the insulating body portion 402. The first protrusions 403 are connected to the side of the insulating body portion 402 facing the electrode assembly 20. The insulating body portion 402 has a first surface 4021 in the thickness direction X facing the top cover plate 30 and connected to the top cover plate 30. The first protrusions 403 have a second surface 4031 in the thickness direction X facing the electrode assembly 20. The blocking portion 502 has a third surface 5021 in the thickness direction X facing the electrode assembly 20. The first surface 4021 and the second surface 4031 have a maximum distance H2 mm in the thickness direction X, and the first surface 4021 and the third surface 5021 have a maximum distance H3 mm in the thickness direction X, satisfying: H3≤H2.

[0079] It should be noted that further references are available. Figure 3Since the first protrusions 403 at both ends of the insulating member 40 are used to contact the electrode assembly 20 and play the role of fixing the electrode assembly 20, the relationship between H3 and H2 needs to meet certain requirements. If H3 is greater than H2, the protrusion 50 will be inserted into the electrode assembly 20. When the electrode assembly 20 vibrates, the protrusion 50 will cause the diaphragm to collapse or the electrode to bend, resulting in a short circuit in the electrode assembly 20.

[0080] In some embodiments, the secondary battery further satisfies: H3≤H2-1, to prevent the boss structure from causing the separator to collapse or the electrode to bend under cell vibration conditions, resulting in a cell short circuit.

[0081] In some embodiments, the secondary battery further satisfies: 1 ≤ H2 ≤ 10; for example, the value of H2 mm can be any one of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or a range between any two values. When H2 mm satisfies the above range, it can further ensure that the height of the protrusion 50 is within a reasonable range of use.

[0082] In some embodiments, the secondary battery further satisfies: 0.5 ≤ H3 ≤ 8; for example, the value of H3 mm can be any one of 0.5, 1, 2, 3, 4, 5, 6, 7, 8 or a range between any two values. When H3 mm satisfies the above range, it can avoid the first protrusion 403 being too short to fix the electrode assembly 20, or too long to occupy too much space in the receiving cavity.

[0083] In some embodiments, see Figure 6 , Figure 7 , Figure 8 and Figure 9 The top cover 30 includes a top cover body 302 and a second protrusion 303. The top cover body 302 has a fourth surface 3021 and a fifth surface 3022 that are opposite to each other in the thickness direction X. The fourth surface 3021 faces the electrode assembly 20 and is connected to the first surface 4021. The second protrusion 303 is connected to the fourth surface 3021 and is disposed around the liquid injection hole 301. The second protrusion 303 is located in the through hole 401. The second protrusion 303 has a sixth surface 3031 facing the electrode assembly 20 in the thickness direction X. The first surface 4021 and the sixth surface 3031 have a maximum distance H4 mm in the thickness direction X, satisfying: H4 < H3.

[0084] Understandably, to achieve a seal on the injection hole 301, a second protrusion 303 needs to be provided on the top cover plate 30 to facilitate the positioning of the sealing pin and achieve a sealing effect. After providing the second protrusion 303, the range H4 < H3 needs to be further limited; otherwise, the protruding part 50 and the second protrusion 303 will interfere with each other, making assembly impossible. Furthermore, after the injection process is completed, the injection hole 301 will be sealed by a sealing pin. To ensure a good seal, the sealing pin generally extends beyond the sixth surface 3031 of the second protrusion 303. To ensure the assembly of the sealing pin, H3 needs to be higher than H4 by the clearance distance of the sealing pin.

[0085] In some embodiments, the secondary battery further satisfies: H3≥H4+1, which ensures the assembly of the sealing nail.

[0086] In some embodiments, the secondary battery further satisfies: 0.4 < H4 ≤ 3; for example, the value of H4 mm can be any one or any two of 0.41, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3. This is because in order to ensure sufficient sealing length between the sealing nail and the injection hole 301 and guarantee airtightness, H4 needs to meet the above range. If H4 is too small or too large, it will cause the battery's airtightness to fail.

[0087] In some embodiments, the area of ​​the injection hole is S2 mm. 2 Furthermore, the following condition must be met: 2 ≤ S² ≤ 15; for example, S² mm. 2 The value of can be any one of the following: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or a range between any two values.

[0088] In some embodiments, see further. Figure 9 The projection of the blocking part 502 along the thickness direction X onto the top cover plate 30 covers the injection hole. Furthermore, the projected area of ​​the blocking part 502 along the thickness direction X onto the top cover plate 30 is S3 mm. 2 The secondary battery further satisfies: 1 ≤ S3 / S2 ≤ 6; for example, the value of S3 / S2 can be any one of 1, 2, 3, 4, 5, 6 or any range between two values. If the S3 / S2 ratio is too small, since the area of ​​the blocking part 502 is smaller than the area of ​​the injection hole 301, it cannot completely prevent the electrolyte from directly impacting the electrode assembly from the injection hole 301, causing the diaphragm to collapse and resulting in a short circuit between the positive and negative electrodes; if the S3 / S2 ratio is too large, the protrusion 50 will be too large, resulting in occupying too much internal space of the housing 10. Among them, S3 mm 2 Satisfying: 2≤S3≤90, for example, S3 mm 2The value can be any one of the following: 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, or a range between any two values.

[0089] It should be noted that common dimensional measurement methods can be used to obtain H1, H2, H3, H4 and S1, S2, and S3. For example, the thickness H1 of the extension 501 can be measured using calipers, micrometers, or other measuring tools. When the extension 501 is irregularly shaped, image processing can be used for measurement; for example, an image of the extension 501 can be acquired, loaded using image processing software, and then measured using the software. Alternatively, a projection method can be used to measure the dimensions by acquiring an image of the extension 501 using a projection measuring device (such as a digital microscope or image measuring instrument). The methods for obtaining H2, H3, and H4 are similar. Correspondingly, the area S1 of the guide hole 503 can also be obtained by projection to acquire the shape of the hole and then calculating the area based on the corresponding shape. The testing methods for S2 and S3 are also the same.

[0090] In some embodiments, see further. Figure 3 , Figure 7 , Figure 8 and Figure 9 The insulating body portion 402 also has a seventh surface 4022 facing the electrode assembly 20 in the thickness direction X, and the seventh surface 4022 and the first surface 4021 are disposed opposite to each other in the thickness direction X; the extension portion 501 includes a plurality of extension segments 5010 disposed around the through hole 401; one end of the extension segment 5010 is connected to the seventh surface 4022, and the other end of the extension segment 5010 away from the seventh surface 4022 is connected to the blocking portion 502; the extension segment 5010 has a radial direction Y that is away from the through hole 401. The extension 5010 also includes an eighth surface 5011 and a ninth surface 5012 near the through hole 401. The extension 5010 further has a tenth surface 4013 located at and connected to both the eighth and ninth surfaces 5011 and 5012 respectively. The secondary battery also includes a first reinforcing member 60, which is connected to the tenth surface 4013 of the adjacent extension 5010. The first reinforcing member 60, the extension 5010, and the blocking portion 502 together form a flow guide hole 503. It is understood that by providing the first reinforcing member 60, the strength of the protrusion 50 can be further improved, preventing the protrusion 50 from breaking and failing due to the impact force of electrolyte injection, thus significantly improving the battery's production yield. Further explanation is needed; see [link to relevant documentation]. Figure 8 , Figure 8 In the structure, the guide hole 503 is enclosed by the first reinforcing member 60, so it is necessary to ensure that the guide hole 503 meets the range specified in S1.

[0091] In some embodiments, the first reinforcing member 60 is connected to the ninth surface 5012 of any two extensions 5010 (not shown in the figure), and the extensions 5010, the blocking portion 502, and the insulating body portion 402 together form a flow guide hole 503. In this case, the first reinforcing member 60 can be understood as being disposed in the flow guide space formed by the extensions 5010 and the blocking portion 502, and the area of ​​the flow guide hole 503 is not affected by the first reinforcing member 60.

[0092] In some embodiments, see further. Figure 10 and Figure 11 The insulating body portion 402 also has a seventh surface 4022 facing the electrode assembly 20 in the thickness direction X. The seventh surface 4022 and the first surface 4021 are disposed opposite to each other in the thickness direction X. The extension portion 501 includes a plurality of extension segments 5010 disposed around the through hole 401, and the extension segments 5010, the blocking portion 502, and the insulating body portion 402 together form a guide hole 503. One end of the extension segment 5010 is connected to the seventh surface 4022, and the end of the extension segment 5010 away from the seventh surface 4022 is connected to the blocking portion 502. The extension segment 5010 has an eighth surface 5011 away from the through hole 401 in the radial direction Y. The secondary battery also includes a second reinforcing member 70, which is disposed in the receiving cavity 101 and is connected to the seventh surface 4022 and the eighth surface 5011 respectively. It should be noted that... Figure 10 and Figure 6 The difference lies in the location of the reinforcing structure. Figure 10 In this embodiment, the second reinforcing member 70 can further improve the strength of the protrusion 50, preventing the protrusion 50 from breaking and failing due to the impact force of electrolyte injection, thus significantly improving the production yield of the battery. Figure 10 In addition, the second reinforcing member 70 also connects the extension section 5010 with the insulating body part 402, which can provide support and further improve the structural strength of the protrusion 50.

[0093] In some embodiments, see further. Figure 12 and Figure 13 The extension 501 includes four extension segments 5010 and the four extension segments 5010 uniformly surround the through hole 401; at this time, the gap between adjacent extension segments 5010 is a guide hole 503; the four guide holes 503 are arranged at 90° intervals on the extension 501. By increasing the number of guide holes 503, the liquid injection efficiency can be further improved without affecting the overall structural strength of the protrusion 50.

[0094] In some embodiments, see further. Figure 14 and Figure 15 ,exist Figure 12Based on the structure, four corresponding second reinforcing members 70 are further provided at each extension section 5010. The second reinforcing members 70 can provide support for the extension section 5010 and further improve the strength of the protrusion 50.

[0095] In some embodiments, see further. Figure 16 and Figure 17 The extension 501 is provided with a plurality of guide holes 503, which are spaced apart circumferentially along the extension 501. It can be understood that "a plurality of" refers to two or more. Figure 16 In this design, there are multiple guide holes 503, which are arranged in a close-packed manner along the circumference of the extension 501. Here, the area S1 can be understood as the sum of the areas of the multiple guide holes 503. Figure 16 and Figure 17 This configuration allows for a larger connected area on the extension 501, further enhancing the strength of the protrusion 50. Simultaneously, the electrolyte enters the housing 10 from all directions through the guide holes 503, ensuring more uniform electrolyte distribution.

[0096] In some embodiments, see further. Figure 18 and Figure 19 The extension 5010 includes a first connecting section 5014 and a first bending section 5015. The first connecting section 5014 is connected to the seventh surface 4022, and the first bending section 5015 is connected to the side of the first connecting section 5014 away from the seventh surface 4022. The side of the first bending section 5015 away from the first connecting section 5014 is connected to the blocking part 502. The first reinforcing member 60, the first connecting section 5014, the first bending section 5015, and the blocking part 502 together form a guide hole 503. It is understood that the first bending section 5015 is elastic and can buffer the impact force generated by the electrolyte. When the electrolyte is injected into the housing 10 through the injection hole 301, and after the electrolyte impacts the protrusion 50, the first bending section 5015 can release part of the impact through deformation, enhancing the mechanical properties of the protrusion 50.

[0097] In some embodiments, see further. Figure 20 and Figure 21The blocking part 502 includes a second connecting section 5022, a second bending section 5023, and a third connecting section 5024. The second connecting section 5022 is connected to the end of the extension section 5010 away from the seventh surface 4022, the second bending section 5023 is connected to the side of the second connecting section 5022 away from the extension section 5010, and the third connecting section 5024 is connected to the side of the second bending section 5023 away from the second connecting section 5022. The first reinforcing member 60, the extension section 5010, the second connecting section 5022, the second bending section 5023, and the third connecting section 5024 together form a guide hole 503. It is understood that the second bending section 5023 is also elastic and can buffer the impact force generated by the electrolyte. When the electrolyte is injected into the housing 10 through the injection hole 301, and after the electrolyte impacts the protrusion 50, the second bending section 5023 can release part of the impact through deformation, enhancing the mechanical properties of the protrusion 50.

[0098] In some embodiments, this application also provides an electrical device, including a secondary battery provided in this embodiment, which powers the electrical device. The electrical device can be an application device such as a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0099] Examples 1-10 are provided, with specific structures as follows: Figures 1-5 As shown in Table 1, the structural parameters of Examples 1-10 satisfy the range 1.2 ≤ H1 × S1 ≤ 120. Comparative Examples 1-2 are also provided, with the same structure as Example 1, but Comparative Examples 1-2 do not satisfy the range 1.2 ≤ H1 × S1 ≤ 120. Performance tests were conducted on the batteries of Examples 1-5 and Comparative Examples 1-2. The tested performance included electrolyte injection efficiency and whether the injection pressure caused the protrusion 50 to break. Specifically, 280g of electrolyte was injected into the secondary battery at a pressure of 0.3MPa, and the time required was measured. In each example, 100 secondary batteries were grouped together, and the number of protrusions that broke in each group was measured.

[0100] Table 1

[0101]

[0102] Referring to Table 1, compared with Comparative Examples 1-2, the secondary batteries of Examples 1-10 satisfy the range of 1.2≤H1×S1≤120, have a shorter electrolyte injection time, and the protrusions are less prone to breakage and are reduced. This achieves the goal of improving the strength of the protrusions while further improving the electrolyte injection efficiency.

[0103] Further examples 11-14 are provided, wherein the structure of examples 11-14 is the same as that of example 1, except that the ranges of H2 mm and H3 mm are different. However, examples 1 and examples 11-14 all satisfy H3≤H2. Further comparative examples 3-4 are provided, with the specific structure being the same as that of comparative example 1. Comparative example 1 satisfies the range H3≤H2, but comparative examples 3-4 do not satisfy the range H3≤H2. Performance tests were performed on the batteries of examples 1, 11-14, and 3-4. The performance tests included whether the electrode assembly was subjected to mechanical force from the protruding parts under vibration conditions, causing the separator to collapse. Specific test results are shown in Table 2.

[0104] Table 2

[0105]

[0106]

[0107] Referring to Table 2, the tests in Examples 1 and 11-14 show that when the secondary battery further satisfies H3≤H2, the problem of the protrusion 50 causing the diaphragm to collapse when the electrode assembly 20 vibrates can be avoided. However, the results of Comparative Examples 1, 3 and 4 show that when the range of H3≤H2 is not met, the mechanical force of the protrusion will cause the diaphragm to collapse.

[0108] Further embodiments 15-19 are provided, wherein the structure of embodiments 15-19 is as follows: Figures 5-9 As shown. Examples 15-19 satisfy the range 1.2 ≤ H1 × S1 ≤ 120, and also satisfy H4 < H3. Comparative Examples 5-7 are further provided, with the same structure as Example 15, except that Comparative Example 5 does not satisfy the range 1.2 ≤ H1 × S1 ≤ 120 but satisfies H4 < H3, while Comparative Examples 5-6 do not satisfy both the ranges 1.2 ≤ H1 × S1 ≤ 120 and H4 < H3. Performance tests were conducted on the batteries of Examples 15-19 and Comparative Examples 5-6, including whether the insulating components and the top cover could not be assembled due to interference in the injection hole area. Specific test results are shown in Table 3.

[0109] Table 3

[0110]

[0111]

[0112] Referring to Table 3, the tests in Examples 15-19 show that when the secondary battery further satisfies H4 < H3, the problem of whether the insulating part and the top cover plate cannot be assembled due to interference in the injection hole area can be avoided; however, the results of Comparative Examples 5-7 show that when the range of H4 < H3 is not met, the protrusion 50 and the second protrusion 303 will interfere and cannot be assembled for production.

[0113] The secondary battery and power-consuming device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A secondary battery, characterized in that, include: A housing having a receiving cavity; An electrode assembly disposed in the receiving cavity; A top cover sheet is connected to the housing and seals the receiving cavity. The top cover sheet has a thickness direction X and is provided with an injection hole that penetrates the top cover sheet along the thickness direction X. An insulating component is disposed in the receiving cavity and connected to the top cover plate on the side facing the electrode assembly. The insulating component has a through hole that penetrates the insulating component along the thickness direction X and communicates with the liquid injection hole. The insulating component includes an insulating body portion. A protrusion includes an extension and a blocking portion. The extension is connected to the side of the insulating member away from the top cover plate and surrounds the through hole. The extension includes multiple extension segments surrounding the through hole, the through hole having a radial direction Y perpendicular to the thickness direction X. Each extension segment has an eighth surface away from the through hole and a ninth surface near the through hole in the radial direction Y. The extension segment also has a tenth surface located between the eighth and ninth surfaces and connected to both the eighth and ninth surfaces. The blocking portion is connected to the side of the extension away from the insulating member, and its orthographic projection along the thickness direction X on the top cover plate covers at least a portion of the injection hole. The extension has at least one guide hole communicating with the injection hole. The total area of ​​the at least one guide hole is S1 mm. 2 The area of ​​the injection hole is S2mm. 2 The thickness of the extension is H1 mm, satisfying: 1≤S1 / S2≤4, 1.2≤H1×S1≤120; where 0.6≤H1≤2, and / or, 2≤S1≤60; A first reinforcing member is connected to the tenth surface of an adjacent extension segment, and the first reinforcing member, the extension segment, and the blocking portion together form the flow guide hole; or, the first reinforcing member is connected to the ninth surface of any two extension segments, and the extension segment, the blocking portion, and the insulating body portion together form the flow guide hole.

2. The secondary battery according to claim 1, characterized in that, The secondary battery satisfies: 2.4≤H1×S1≤30.

3. The secondary battery according to claim 1, characterized in that, The insulating component includes first protrusions on both sides of the insulating body portion, the first protrusions being connected to the side of the insulating body portion facing the electrode assembly. The insulating body portion has a first surface in the thickness direction X that faces and is connected to the top cover sheet; the first protrusion has a second surface in the thickness direction X that faces the electrode assembly; and the blocking portion has a third surface in the thickness direction X that faces the electrode assembly. The first surface and the second surface have a maximum distance H2mm in the thickness direction X, and the first surface and the third surface have a maximum distance H3mm in the thickness direction X, satisfying: H3≤H2.

4. The secondary battery according to claim 3, characterized in that, The secondary battery satisfies at least one of the following characteristics: c) H3 ≤ H2-1; d) 1 ≤ H2 ≤ 10; e) 0.5 ≤ H3 ≤ 8.

5. The secondary battery according to claim 3, characterized in that, The top cover includes a top cover body and a second protrusion; the top cover body has a fourth surface and a fifth surface facing away from each other in the thickness direction X, the fourth surface facing the electrode assembly and connected to the first surface; the second protrusion is connected to the fourth surface and surrounds the injection hole, the second protrusion is located in the through hole; the second protrusion has a sixth surface facing the electrode assembly in the thickness direction X; wherein, the first surface and the sixth surface have a maximum distance H4mm in the thickness direction X, satisfying: H4 < H3.

6. The secondary battery according to claim 5, characterized in that, The secondary battery satisfies at least one of the following characteristics: f) H3 ≥ H4 + 1; g) 0.4 < H4 ≤ 3.

7. The secondary battery according to claim 3, characterized in that, The insulating body portion further has a seventh surface facing the electrode assembly in the thickness direction X, and the seventh surface and the first surface are disposed opposite to each other in the thickness direction X; One end of the extension is connected to the seventh surface, and the other end of the extension away from the seventh surface is connected to the blocking portion.

8. The secondary battery according to claim 3, characterized in that, The insulating body portion further has a seventh surface facing the electrode assembly in the thickness direction X, and the seventh surface and the first surface are disposed opposite to each other in the thickness direction X; The extension includes a plurality of extension segments arranged around the through hole, and the extension segments, the blocking portion and the insulating body portion together form the flow guide hole; one end of the extension segment is connected to the seventh surface, and the other end of the extension segment away from the seventh surface is connected to the blocking portion; the through hole has a radial direction Y perpendicular to the thickness direction X, and the extension segment has an eighth surface away from the through hole in the radial direction Y; The secondary battery also includes: The second reinforcing member is disposed within the receiving cavity and is connected to the seventh surface and the eighth surface, respectively.

9. The secondary battery according to claim 1, characterized in that, The extension is provided with a plurality of flow guide holes, which are spaced apart circumferentially along the extension.

10. The secondary battery according to claim 7, characterized in that, The extension section includes a first connecting section and a first bending section. The first connecting section is connected to the seventh surface, and the first bending section is connected to the side of the first connecting section away from the seventh surface. The side of the first bending section away from the first connecting section is connected to the blocking portion. The first reinforcing member, the first connecting section, the first bending section, and the blocking portion together form the guide hole.

11. The secondary battery according to claim 7, characterized in that, The blocking portion includes a second connecting section, a second bending section, and a third connecting section; the second connecting section is connected to the end of the extension section away from the seventh surface, the second bending section is connected to the side of the second connecting section away from the extension section, and the third connecting section is connected to the side of the second bending section away from the second connecting section; wherein, the first reinforcing member, the extension section, the second connecting section, the second bending section, and the third connecting section together form the guide hole.

12. An electrical appliance, characterized in that, The device includes a secondary battery as described in any one of claims 1-11, wherein the secondary battery is used to supply power to the electrical device.

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