Single battery and battery pack

Abstract

The embodiment of the utility model relates to the technical field of batteries, and particularly discloses a single battery and a battery pack, and the single battery comprises a shell provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the top cover is connected to one side, in the first direction, of the shell and covers and seals the containing cavity, and a liquid injection hole is formed in the top cover; the insulating component comprises an insulating main body and a plurality of insulating main body blocking parts, the insulating main body is connected to the side, close to the electrode assembly, of the top cover, a through hole is formed in the insulating main body, the through hole is provided with a hole wall, and the through hole is communicated with the liquid injection hole; the multiple blocking parts are all connected to the hole wall, and in the radial direction, the blocking parts extend in the direction from the hole wall to the center of the through hole. According to the invention, the tab of the electrode assembly is prevented from extending into the through hole and being in contact with the top cover to cause short circuit of the single battery, the risk of short circuit between the electrode assembly and the top cover is reduced, and the safety performance of the single battery is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery and a battery pack. BACKGROUND

[0002] With the rapid development of the new energy industry, secondary batteries with high energy density, high cycle life and high safety performance have been widely applied and developed, and there is an urgent need for secondary batteries with greater capacity, greater durability and greater safety. Safety performance is one of the core performances of secondary batteries. Therefore, how to improve the safety performance of secondary batteries has become a problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a single battery and a battery pack to ensure the safety performance of the single battery.

[0004] To solve the above technical problems, embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a single battery is provided, having a first direction, comprising:

[0006] a housing provided with a receiving cavity;

[0007] an electrode assembly arranged in the receiving cavity;

[0008] a top cover connected to one side of the housing in the first direction and covering the receiving cavity, and a liquid injection hole is formed in the top cover; and

[0009] an insulating member, the insulating member comprising: an insulating body and a plurality of insulating body blocking portions, the insulating body being connected to one side of the top cover close to the electrode assembly, the insulating body being provided with a through hole, the through hole having a hole wall, and the through hole being in communication with the liquid injection hole, the through hole having a radial direction perpendicular to the first direction and a circumferential direction around the first direction; the plurality of blocking portions are all connected to the hole wall, in the radial direction, the blocking portions extend along the hole wall in the direction of the center of the through hole, and the plurality of blocking portions are arranged at intervals in the circumferential direction, the first liquid injection channel being formed by the adjacent two blocking portions and the hole wall, and the first liquid injection channel being in communication with the liquid injection hole and the receiving cavity.

[0010] In addition to one or more features disclosed above, or as an alternative, the single battery also has a reference plane perpendicular to the first direction;

[0011] In the first direction, the area of the orthogonal projection of each blocking portion on the reference plane is S1 mm 2 , the area of the orthogonal projection of the hole wall of the through hole on the reference plane is S2 mm 2 , and satisfies: 0.002≤S1 / S2≤0.166; or,

[0012] Along the first direction, the orthographic projection area of ​​each blocking part on the reference plane is S1 mm. 2 The orthographic projection area of ​​the hole wall on the reference plane is S² mm. 2 The condition is satisfied that 0.037≤S1 / S2≤0.1.

[0013] In addition to one or more of the features disclosed above, or alternatively, along the first direction, the orthographic projection area S1 mm of each blocking portion on the reference plane. 2 It also satisfies: 0.424≤S1≤12.162; and / or,

[0014] The orthographic projection area of ​​the hole wall on the reference plane is S2 mm. 2 It also satisfies: 7.065≤S2≤254.34.

[0015] In addition to one or more of the features disclosed above, or alternatively, the radial dimension of the blocking portion is L1 mm, and the maximum profile dimension of the through hole is D mm, satisfying: 0.02 ≤ L1 / D ≤ 0.47; or,

[0016] The radial dimension L1 mm of the blocking part and the maximum profile dimension D mm of the through hole also satisfy: 0.06≤L1 / D≤0.18.

[0017] In addition to one or more of the features disclosed above, or alternatively, the radial dimension L1mm of the blocking portion also satisfies: 0.3≤L1≤1.4; and / or,

[0018] The maximum outline dimension D mm of the through hole also satisfies: 3≤D≤18.

[0019] In addition to one or more of the features disclosed above, or as an alternative, the insulating member further includes: a plurality of reinforcing portions, each reinforcing portion being connected to a corresponding blocking portion on the side near the electrode assembly, the plurality of reinforcing portions enclosing a flow channel with an opening, the flow channel communicating with a through hole, the opening communicating the flow channel with a receiving cavity, the plurality of reinforcing portions being arranged at intervals in the circumferential direction, a first flow port being formed between two adjacent reinforcing portions, the first flow port communicating the flow channel with the receiving cavity, and the first flow port communicating with a first liquid injection channel.

[0020] In addition to one or more of the features disclosed above, or as an alternative, the through hole has a central axis extending along a first direction, and the radius of the through hole intersects the central axis;

[0021] Multiple blocking parts are arranged symmetrically about the central axis, and multiple reinforcing parts are arranged symmetrically about the central axis.

[0022] In addition to one or more of the features disclosed above, or alternatively, the reinforcement extends along the first direction; or,

[0023] The reinforcing part is inclined relative to the first direction, and in the first direction, along the direction of the insulating member toward the electrode assembly, the distance between the reinforcing part and the central axis of the through hole decreases.

[0024] In addition to one or more of the features disclosed above, or as an alternative, the blocking part includes: a plurality of sub-blocking parts, the plurality of sub-blocking parts being arranged at circumferential intervals, and a second injection channel being formed between two adjacent sub-blocking parts;

[0025] The reinforcing part includes: multiple sub-reinforcing parts, each sub-reinforcing part is connected to a corresponding sub-blocking part on the side near the electrode assembly, and the multiple sub-reinforcing parts are arranged circumferentially, with a second flow guide between two adjacent sub-reinforcing parts, the second flow guide connecting the flow guide channel to the receiving cavity, and the second flow guide connecting the second liquid injection channel.

[0026] In addition to one or more of the features disclosed above, or alternatively, the single cell also has a second direction intersecting the first direction;

[0027] The insulating component also includes: a pressure relief boss connected to the side of the insulating body near the electrode assembly, and the pressure relief boss and the through hole are spaced apart in the second direction;

[0028] The distance between the pressure relief boss and the through hole is L2 mm, and the dimension of the insulating body in the second direction is L4 mm, satisfying: 0.005≤L2 / L4≤0.833.

[0029] In addition to one or more of the features disclosed above, or alternatively, the distance L2 mm between the pressure relief boss and the through hole also satisfies: 3 ≤ L2 ≤ 500; and / or,

[0030] The dimension L4 mm of the insulating body in the second direction also satisfies: 10≤L4≤600.

[0031] In addition to one or more of the features disclosed above, or as an alternative, the single cell also includes: a terminal post disposed on the top cover, with a portion of the terminal post passing through the insulating body and electrically connected to the electrode assembly, and a through hole located between the terminal post and the pressure relief boss;

[0032] The distance between the pole and the through hole is L3 mm, which satisfies: 0.0067≤L3 / L4≤0.8333.

[0033] In addition to one or more of the features disclosed above, or alternatively, the distance L3mm between the pole and the through hole also satisfies: 4≤L3≤500.

[0034] On the other hand, a battery pack is further disclosed, which, in addition to one or more of the features disclosed above, or alternatively, includes a housing; and individual cells as described in any of the preceding claims, the individual cells being disposed within the housing.

[0035] One of the above technical solutions has the following advantages or beneficial effects: By setting a blocking part in the through hole of the insulating component, the blocking part can buffer the electrolyte during the liquid injection of the single cell, thereby reducing the direct impact of the electrolyte on the electrode assembly during liquid injection, thus reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly, reducing the safety hazards of the single cell, and ensuring the yield of the finished single cell; at the same time, the blocking part also covers the top cover part, reducing the overlap area between the top cover and the through hole, preventing the electrode tabs of the electrode assembly from extending into the through hole and contacting the top cover, causing a short circuit in the single cell, reducing the short circuit risk between the electrode assembly and the top cover, and ensuring the safety performance of the single cell. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 This is a three-dimensional structural view of a single battery cell provided according to an embodiment of this application;

[0038] Figure 2 This is an exploded structural view of a single cell provided according to an embodiment of this application;

[0039] Figure 3 This is a three-dimensional structural view of the insulating component provided according to an embodiment of this application;

[0040] Figure 4 This is a three-dimensional structural view of the insulating component provided according to an embodiment of this application;

[0041] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0042] Figure 6 This is a bottom view of the insulating member provided according to an embodiment of this application;

[0043] Figure 7 yes Figure 6 A magnified view of a section at point B in the middle;

[0044] Figure 8 This is a three-dimensional structural view of an insulating member provided according to another embodiment of this application;

[0045] Figure 9 This is a bottom view of an insulating member provided according to another embodiment of this application;

[0046] Figure 10 yes Figure 9 A magnified view of a section at point C;

[0047] Figure 11 This is a three-dimensional structural view of an insulating member provided according to yet another embodiment of this application;

[0048] Figure 12 This is a bottom view of an insulating member provided according to yet another embodiment of this application;

[0049] Figure 13 yes Figure 12 A magnified view of a section at point D;

[0050] Figure 14 This is a schematic diagram of the battery pack structure provided according to an embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100. Single cell battery;

[0053] 110. Shell; 111. Receiving cavity;

[0054] 120. Electrode assembly;

[0055] 130. Top cover; 131. Injection port;

[0056] 140. Insulating component; 141. Insulating body; 1411. Through hole; 1412. Hole wall; 142. Blocking part; 1421. Sub-blocking part; 1422. First injection channel; 1423. Second injection channel; 143. Reinforcing part; 1431. Flow guiding channel; 1432. Opening; 1433. First flow guiding port; 1434. Sub-reinforcing part; 1435. Second flow guiding port; 144. Pressure relief boss;

[0057] 150, pole;

[0058] 160. Pressure relief valve;

[0059] 200. Box body;

[0060] 300. Box lid. Detailed Implementation

[0061] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0062] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are 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 of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] Current secondary battery filling processes typically involve injecting electrolyte directly into the battery through filling holes and lower plastic through-holes using filling equipment. However, in actual production, to improve process efficiency and ensure the battery cells are fully filled with electrolyte, higher injection pressures are usually used. Due to the high injection pressure and the lack of flow obstruction during electrolyte injection, the electrolyte flowing in through the filling holes and lower plastic through-holes directly impacts the positive and negative electrode plates and separator inside the secondary battery, damaging the internal structure and affecting the battery's yield and safety performance. Furthermore, the lower plastic through-hole design makes it easy for the electrode tabs to contact the top cover, creating a short-circuit risk between the electrode assembly and the top cover, further impacting the secondary battery's safety performance.

[0066] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figures 1 to 13 This application provides a single-cell battery 100, which has a first direction Z, a second direction X, and a third direction Y that intersect each other in pairs. For example, the single-cell battery 100 has a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other in pairs. Here, "perpendicular" refers to a state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0067] Specifically, the single cell 100 includes: a casing 110, an electrode assembly 120, a top cover 130, and an insulating component 140.

[0068] Specifically, the housing 110 is provided with a receiving cavity 111; the electrode assembly 120 is disposed in the receiving cavity 111; the top cover 130 is connected to one side of the housing 110 in the first direction Z, the top cover 130 covers the receiving cavity 111, and the top cover 130 is provided with a liquid injection hole 131; the insulating member 140 is disposed in the receiving cavity 111, and the insulating member 140 is connected to the side of the top cover 130 near the electrode assembly 120.

[0069] The single cell 100 can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. For example, the single cell 100 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, or nickel-cadmium battery, but is not limited to these.

[0070] The single cell 100 can be a prismatic cell, a pouch cell, or a cell of other shapes. For example, in this application, the single cell 100 is a square cell.

[0071] The housing 110 may be made of a strong material such as metal, but is not limited to this. For example, the housing 110 described above is made of aluminum profile, but is not limited to this.

[0072] The top cover 130 can be integrally formed with the housing 110, meaning the top cover 130 can serve as the outer wall of the housing 110. The top cover 130 can also be fixedly connected to the housing 110, for example, by welding or other processes, to one end of the housing 110 in the Z-axis direction. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the top cover 130 and the housing 110 are separate components, and the top cover 130 and the housing 110 are fixed together by welding.

[0073] The insulating component 140 can be made of rubber, silicone, or plastic, but is not limited to these materials.

[0074] The single-cell battery 100 also includes an electrolyte, electrode posts 150, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives. The electrolyte is used to wet the electrode assembly 120. The electrode assembly 120 is the component in the single-cell battery 100 where electrochemical reactions occur, and there can be one or more electrode assemblies. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. The portions of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 120, while the portions without active materials constitute the tabs. During the charging and discharging process of the single-cell battery 100, the positive and negative active materials react with the electrolyte, and the tabs are electrically connected to the electrode posts 150 to form a current loop, enabling the single-cell battery 100 to function normally.

[0075] Specifically, refer to Figures 3 to 7 The insulating member 140 includes an insulating body 141 and a plurality of blocking portions 142. The insulating body 141 is connected to the top cover 130 on the side near the electrode assembly 120. The insulating body 141 has a through hole 1411 with a hole wall 1412 and communicates with the liquid injection hole 131. The through hole 1411 has a radial direction P perpendicular to the first direction Z and a circumferential direction R around the first direction Z. The plurality of blocking portions 142 are all connected to the hole wall 1412. In the radial direction P, the blocking portions 142 extend along the hole wall 1412 toward the center of the through hole 1411. For example, in this application, in the radial direction P, the blocking portions 142 extend along the hole wall 1412 toward the center of the through hole 1411. Multiple blocking parts 142 are arranged at intervals on the circumferential direction R. Two adjacent blocking parts 142 and the hole wall 1412 together form the first liquid injection channel 1422, which connects the liquid injection hole 131 with the receiving cavity 111.

[0076] The insulating body 141 and the blocking part 142 can be integrally formed, meaning they are a single structure. Alternatively, the insulating body 141 and the blocking part 142 can be separately configured and fixedly connected to each other. For example, the blocking part 142 is fixedly connected to the insulating body 141 by an adhesive bonding process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the insulating body 141 and the blocking part 142 are integrally injection molded.

[0077] The individual cell also has a reference plane (not shown) perpendicular to the first direction Z. Along the first direction Z, the orthogonal projection of the blocking part 142 on the reference plane is located on the orthogonal projection of the hole wall 1412 of the through hole 1411 on the reference plane, that is, the blocking part 142 is located inside the through hole 1411.

[0078] The through hole 1411 can be of any shape. For example, in this application, the through hole 1411 is circular to facilitate the processing and shaping of the through hole 1411.

[0079] Understandably, this application provides a blocking portion 142 within the through hole 1411 of the insulating member 140 to buffer the electrolyte during electrolyte injection into the single cell 100. This reduces the direct impact of the electrolyte on the electrode assembly 120 during injection, thereby reducing the shedding of active materials from the positive and negative electrode plates in the electrode assembly 120, reducing safety hazards of the single cell 100, and ensuring the yield of the finished product. At the same time, the blocking portion 142 also partially blocks the top cover 130 to reduce the overlap area between the top cover 130 and the through hole 1411, preventing the electrode tabs of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, thus preventing a short circuit in the single cell 100. This reduces the risk of a short circuit between the electrode assembly 120 and the top cover 130 and ensures the safety performance of the single cell 100.

[0080] In one embodiment, a sealing element (not shown in the figure) is also provided at the injection hole 131 to seal the injection hole 131, thereby sealing the entire single cell 100 and ensuring the normal use of the single cell 100.

[0081] In one embodiment, the single cell 100 further has a reference plane O perpendicular to the first direction Z. Specifically, along the first direction Z, the orthogonal projection area of ​​each blocking portion 142 on the reference plane O is S1 mm. 2 The orthographic projection area of ​​the hole wall 1412 of the through hole 1411 onto the reference plane O is S2 mm. 2 The condition is satisfied that 0.002 ≤ S1 / S2 ≤ 0.166. That is, the orthogonal projection area S1 mm of each blocking part 142 on the reference plane O. 2The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The ratio can be controlled within the range of 0.002 to 0.166. For example, S1 / S2 can be a range consisting of one or any two of the following: 0.002, 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.16, or 0.166. The specific values ​​of S1 / S2 given above are merely illustrative; any value within the range of 0.002 to 0.166 is within the scope of protection of this application.

[0082] This application defines the orthographic projection area S1 mm of each blocking part 142 on the reference plane O. 2 The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The ratio is in the range of 0.002 to 0.166, so that the structural dimensions between the blocking part 142 and the through hole 1411 are reasonably designed to ensure the electrolyte injection efficiency of the single cell 100. At the same time, it ensures that the blocking part 142 can effectively block and buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection, thereby reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120 and reducing the safety hazards of the single cell 100. It also ensures that the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, causing a short circuit in the single cell 100, reducing the short circuit risk between the electrode assembly 120 and the top cover 130, and ensuring the safety performance of the single cell 100.

[0083] Among them, the orthographic projection area of ​​each blocking part 142 on the reference plane O is S1 mm. 2 The actual single cell 100 can be disassembled, and the image area of ​​any one of the blocking parts 142 of the insulating member 140 can be measured multiple times using a projection measurement device (such as a digital microscope or image measuring instrument) to obtain the orthogonal projection area S1 mm of the blocking part 142 on the reference plane O. 2 However, it is not limited to this.

[0084] The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The actual single cell 100 can be disassembled, and the image area of ​​the hole wall 1412 of the through hole 1411 of the insulating component 140 can be measured multiple times using a projection measurement device (such as a digital microscope or image measuring instrument). This allows for the obtaining of the orthogonal projection area S2 mm of the hole wall 1412 of the through hole 1411 on the reference plane O. 2 However, it is not limited to this.

[0085] In one embodiment, along the first direction Z, the orthographic projection area of ​​each blocking portion 142 on the reference plane O is S1mm. 2 The orthographic projection area of ​​the hole wall 1412 of the through hole 1411 onto the reference plane O is S2 mm. 2 The condition is satisfied that 0.037 ≤ S1 / S2 ≤ 0.1. That is, the orthogonal projection area S1 mm of each blocking part 142 on the reference plane O. 2 The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The ratio can be controlled within the range of 0.037 to 0.1. For example, S1 / S2 can be a range of one or any two of 0.037, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1. The specific values ​​of S1 / S2 given above are merely illustrative; any value within the range of 0.037 to 0.1 is within the scope of protection of this application.

[0086] This application defines the orthographic projection area S1 mm of each blocking part 142 on the reference plane O. 2 The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The ratio is in the range of 0.037 to 0.1, so as to further optimize the structural dimensions between the blocking part 142 and the through hole 1411, thereby ensuring the electrolyte injection efficiency of the single cell 100; at the same time, it ensures that the blocking part 142 can effectively block and buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection, thereby reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120 and reducing the safety hazards of the single cell 100; it also ensures that the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, causing a short circuit in the single cell 100, reducing the short circuit risk between the electrode assembly 120 and the top cover 130, and ensuring the safety performance of the single cell 100.

[0087] For example, in this application, the orthographic projection of each blocking portion 142 on the reference plane O is fan-shaped, and the central angle of each blocking portion 142 is 60°.

[0088] In one embodiment, along the first direction Z, the orthogonal projection area of ​​each blocking portion 142 on the reference plane O is S1 mm. 2 It also satisfies: 0.424≤S1≤12.162. That is, the orthogonal projection area S1mm of each blocking part 142 along the first direction Z on the reference plane O. 2 It can be controlled within 0.424mm 2 ~12.162mm2 Within the range. For example, S1 mm 2 It can be 0.424mm 2 1mm 2 2mm 2 3mm 2 4mm 2 5mm 2 6mm 2 7mm 2 8mm 2 9mm 2 10mm 2 11mm 2 12mm 2 Or 12.162mm 2 The range consisting of one or any two of them. S1 mm 2 The specific values ​​mentioned above are merely illustrative examples; as long as it is within 0.424mm... 2 ~12.162mm 2 Any value within the range is within the protection scope of this application. This application defines the orthographic projection area S1 mm of each blocking part 142 along the first direction Z on the reference plane O. 2 At 0.424mm 2 ~12.162mm 2 Within the specified range, the electrolyte injection efficiency of the single cell 100 is ensured; at the same time, the blocking part 142 can effectively block and buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection, thereby reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120 and reducing the safety hazards of the single cell 100; the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, causing a short circuit in the single cell 100, reducing the risk of short circuit between the electrode assembly 120 and the top cover 130, and ensuring the safety performance of the single cell 100.

[0089] In one embodiment, along the first direction Z, the orthogonal projection area of ​​the hole wall 1412 of the through hole 1411 onto the reference plane O is S2 mm. 2 It also satisfies: 7.065 ≤ S2 ≤ 254.34. That is, the orthogonal projection area S2 mm of the hole wall 1412 of the through hole 1411 along the first direction Z on the reference plane O. 2 It can be controlled at 7.065mm 2 ~254.34mm 2 Within the range. For example, S2 mm 2 It can be 7.065mm. 2 20mm 240mm 2 60mm 2 80mm 2 100mm 2 120mm 2 140mm 2 160mm 2 180mm 2 200mm 2 220mm 2 240mm 2 250mm 2 Or 254.34mm 2 The range consisting of one or any two of them. S2 mm 2 The specific values ​​mentioned above are merely illustrative examples; as long as it is within 7.065mm... 2 ~254.34mm 2 Any value within the range is within the protection scope of this application. This application defines the orthogonal projection area S2 mm of the hole wall 1412 of the through hole 1411 along the first direction Z on the reference plane O. 2 At 7.065mm 2 ~254.34mm 2 Within this range, to further ensure the efficient flow of electrolyte through the self-contained hole 1411 during electrolyte injection of the single cell 100, and to ensure the electrolyte injection efficiency of the single cell 100.

[0090] In one embodiment, reference is made to Figures 6 to 7 When the inner wall arc length of the blocking part 142 along the circumferential direction (i.e., the inner wall arc length of the blocking part 142 closest to the central axis Q in the radial direction P) is a constant, the dimension of the blocking part 142 in the radial direction P is L1 mm, and the maximum outline dimension of the through hole 1411 is D mm, satisfying: 0.02≤L1 / D≤0.47. That is, the ratio of the dimension L1 mm of the blocking part 142 in the radial direction P to the maximum outline dimension D mm of the through hole 1411 can be controlled within the range of 0.02 to 0.47. For example, L1 / D can be one of 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or 0.47, or any combination of two of them. The specific values ​​of L1 / D given above are only illustrative examples, and any value within the range of 0.02 to 0.47 is within the protection scope of this application.

[0091] The dimension L1 mm of the blocking part 142 in the radial direction P can be obtained by disassembling the actual single cell 100 and measuring the distance between the outer wall of the blocking part 142 near the center of the through hole 1411 and the hole wall 1412 on the insulating member 140 multiple times using a measuring tool, and calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to this.

[0092] The maximum outline dimension D mm of the through hole 1411 can be obtained by disassembling the actual single cell 100 and measuring the diameter of the through hole 1411 on the insulating component 140 multiple times using a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to these.

[0093] This application defines the dimension L1 of the blocking portion 142 in the radial direction P. The ratio of mm to the maximum outline dimension Dmm of the through hole 1411 is within the range of 0.02 to 0.47, so as to further optimize the structural dimensions between the blocking part 142 and the through hole 1411. This ensures efficient flow of electrolyte through the through hole 1411 during electrolyte filling of the single cell 100, thus ensuring the electrolyte filling efficiency of the single cell 100. At the same time, it ensures that the blocking part 142 can effectively block and buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte filling of the single cell 100. This reduces the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120, reducing the safety hazards of the single cell 100. It also ensures that the blocking part 142 can effectively shield the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tabs of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, thus preventing a short circuit in the single cell 100. This reduces the risk of short circuit between the electrode assembly 120 and the top cover 130, ensuring the safety performance of the single cell 100.

[0094] Furthermore, the radial dimension L1 mm of the blocking portion 142 and the maximum outline dimension D mm of the through hole 1411 also satisfy: 0.06 ≤ L1 / D ≤ 0.18. That is, the ratio of the radial dimension L1 mm of the blocking portion 142 to the maximum outline dimension D mm of the through hole 1411 can be controlled within the range of 0.06 to 0.18. For example, L1 / D can be one or any combination of two of the following: 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, or 0.18. The specific values ​​of L1 / D given above are merely illustrative, and any value within the range of 0.06 to 0.18 is within the protection scope of this application. This application limits the ratio of the radial dimension L1 mm of the blocking part 142 to the maximum outline dimension D mm of the through hole 1411 to be within the range of 0.06 to 0.18, so as to further optimize the structural dimensions between the blocking part 142 and the through hole 1411. This ensures better liquid injection efficiency of the single cell 100 while ensuring that the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, thereby preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, which would cause a short circuit in the single cell 100. This reduces the risk of short circuit between the electrode assembly 120 and the top cover 130 and ensures the safety performance of the single cell 100.

[0095] In one embodiment, reference is made to Figures 6 to 7The dimension L1 mm of the blocking portion 142 in the radial direction P also satisfies: 0.3 ≤ L1 ≤ 1.4. That is, the dimension L1 mm of the blocking portion 142 in the radial direction P can be controlled within the range of 0.3 mm to 1.4 mm. For example, L1 can be one or any combination of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, or 1.4 mm. The specific values ​​of L1 given above are only illustrative examples, and any value within the range of 0.3 mm to 1.4 mm is within the protection scope of this application. This application limits the radial dimension L1 mm of the blocking part 142 to within the range of 0.3 mm to 1.4 mm to rationally design the structural dimensions of the blocking part 142. This further ensures that the blocking part 142 can effectively block and buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection of the single cell 100. This reduces the shedding of active materials from the positive and negative electrode plates in the electrode assembly 120, thereby reducing the safety hazards of the single cell 100. It also ensures that the blocking part 142 can effectively shield the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, thus causing a short circuit in the single cell 100. This reduces the risk of short circuit between the electrode assembly 120 and the top cover 130, ensuring the safety performance of the single cell 100.

[0096] Furthermore, the dimension L1 mm of the blocking portion 142 in the radial direction P also satisfies: 0.7 ≤ L1 ≤ 1.1. That is, the dimension L1 mm of the blocking portion 142 in the radial direction P can be controlled within the range of 0.7 mm to 1.1 mm. For example, L1 can be one or a combination of any two of the following: 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, or 1.1 mm. The specific values ​​of L1 given above are merely illustrative examples, and any value within the range of 0.7 mm to 1.1 mm is within the protection scope of this application. This application limits the radial dimension L1 mm of the blocking part 142 to within the range of 0.7 mm to 1.1 mm to further optimize the structural dimensions of the blocking part 142. This ensures that the blocking part 142 can effectively buffer the electrolyte, reducing the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection of the single cell 100. This reduces the shedding of active materials from the positive and negative electrode plates in the electrode assembly 120, thus reducing the safety hazards of the single cell 100. It also ensures that the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tabs of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, which could cause a short circuit in the single cell 100. This reduces the risk of a short circuit between the electrode assembly 120 and the top cover 130, ensuring the safety performance of the single cell 100.

[0097] In one embodiment, reference is made to Figures 6 to 7 The maximum outline dimension D mm of the through hole 1411 also satisfies: 3 ≤ D ≤ 18. That is, the maximum outline dimension D mm of the through hole 1411 can be controlled within the range of 3 mm to 18 mm. For example, the maximum outline dimension D mm can be one or any combination of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, or 18 mm. The specific values ​​of the maximum outline dimension D mm mentioned above are only given as examples, and any value within the range of 3 mm to 18 mm is within the protection scope of this application. By limiting the maximum outline dimension D mm of the through hole 1411 to the range of 3 mm to 18 mm, this application reasonably designs the structural dimensions of the through hole 1411 to further ensure the efficient flow of electrolyte through the through hole 1411 during electrolyte filling of the single cell 100, thereby ensuring the electrolyte filling efficiency of the single cell 100.

[0098] Furthermore, the maximum outline dimension D mm of the through hole 1411 also satisfies: 6 ≤ D ≤ 12. That is, the maximum outline dimension D mm of the through hole 1411 can be controlled within the range of 6 mm to 12 mm. For example, the maximum outline dimension D mm can be one or a combination of any two of the following: 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, or 12 mm. The specific values ​​of the maximum outline dimension D mm given above are merely illustrative examples, and any value within the range of 6 mm to 12 mm is within the protection scope of this application. This application further optimizes the structural dimensions of the through hole 1411 by limiting its maximum outline dimension D mm to the range of 6 mm to 12 mm. This ensures efficient electrolyte flow through the through hole 1411 during electrolyte filling of the single cell 100, thereby guaranteeing the electrolyte filling efficiency of the single cell 100. At the same time, it further prevents the electrode tabs of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, thus reducing the risk of short circuit between the electrode assembly 120 and the top cover 130 and ensuring the safety performance of the single cell 100.

[0099] In one embodiment, in order to improve the overall strength of the insulating member 140, reference is made in this application. Figures 3 to 7 The insulating member 140 also includes a plurality of reinforcing parts 143, each reinforcing part 143 being connected to a corresponding blocking part 142 on the side near the electrode assembly 120.

[0100] Specifically, multiple reinforcing parts 143 enclose and form a flow channel 1431 with an opening 1432. The flow channel 1431 is connected to the through hole 1411. The opening 1432 connects the flow channel 1431 to the receiving cavity 111. The multiple reinforcing parts 143 are arranged at intervals in the circumferential direction R. A first flow port 1433 is formed between two adjacent reinforcing parts 143. The first flow port 1433 connects the flow channel 1431 to the receiving cavity 111. The first flow port 1433 is connected to the first liquid injection channel 1422.

[0101] The reinforcing part 143 can be integrally formed with the blocking part 142, meaning the reinforcing part 143 and the blocking part 142 are a single integrated structure. Alternatively, the insulating body 141 and the blocking part 142 can be separately disposed, but fixedly connected to each other. For example, the reinforcing part 143 is fixedly connected to the blocking part 142 by an adhesive bonding process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the reinforcing part 143 and the blocking part 142 are integrally injection molded.

[0102] It is understandable that during the liquid injection process, the high liquid injection pressure may damage the blocking part 142, affecting the yield of the finished product of the single cell 100.

[0103] This application provides a reinforcing part 143 on the side of the blocking part 142 near the electrode assembly 120, so as to improve the strength of the blocking part 142 by means of the reinforcing part 143, thereby improving the overall strength of the insulating member 140, avoiding damage to the blocking part 142 when the single cell 100 is filled with liquid, and ensuring the yield of the finished single cell 100.

[0104] Meanwhile, during electrolyte injection, the electrolyte in the single cell 100 flows from the injection hole 131 to the through hole 1411, and then from the through hole 1411 to the flow channel 1431. Part of the electrolyte in the flow channel 1431 flows from the opening 1432 into the receiving cavity 111, and another part of the electrolyte in the flow channel 1431 flows from the first flow port 1433 into the receiving cavity 111. By guiding the electrolyte, the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection is further reduced, thereby reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120 and reducing the safety hazards of the single cell 100.

[0105] In one embodiment, the plurality of blocking portions 142 and the plurality of reinforcing portions 143 may be arranged asymmetrically.

[0106] In another embodiment, reference is made to Figures 8 to 10 The through hole 1411 has a central axis Q, which extends along the first direction Z, and the radii of the through hole 1411 intersect the central axis Q. Multiple blocking parts 142 are symmetrically arranged about the central axis Q, and multiple reinforcing parts 143 are symmetrically arranged about the central axis Q, so as to ensure that the electrolyte can flow quickly from the first injection channel 1422 into the receiving cavity 111 when the single cell 100 is injected with electrolyte, thereby improving the injection efficiency of the single cell 100 while ensuring the safety performance of the single cell 100. At the same time, it facilitates the processing and forming of the insulating component 140 and improves the production efficiency of the single cell 100.

[0107] In one embodiment, the reinforcing portion 143 extends along the first direction Z to facilitate the processing and forming of the insulating member 140 and improve the production efficiency of the single cell 100.

[0108] In another embodiment, the reinforcing part 143 is inclined relative to the first direction Z, and in the first direction Z, along the direction of the insulating member 140 toward the electrode assembly 120, the distance between the reinforcing part 143 and the central axis Q of the through hole 1411 is reduced, so that the flow channel 1431 is generally tapered, which improves the flow guiding effect of the flow channel 1431 formed by the reinforcing part 143. At the same time, it further avoids the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, causing a short circuit in the single cell 100, and reduces the risk of short circuit between the electrode assembly 120 and the top cover 130.

[0109] In yet another embodiment, reference is made to... Figures 11 to 13 The blocking part 142 includes a plurality of sub-blocking parts 1421, which are arranged at intervals along the circumferential direction R, and a second injection channel 1423 is formed between two adjacent sub-blocking parts 1421.

[0110] The reinforcing part 143 includes a plurality of sub-reinforcing parts 1434, each sub-reinforcing part 1434 being connected to a corresponding sub-blocking part 1421 on the side near the electrode assembly 120, and the plurality of sub-reinforcing parts 1434 being spaced apart along the circumferential direction R. A second flow port 1435 is formed between two adjacent sub-reinforcing parts 1434. The second flow port 1435 connects the flow channel 1431 to the receiving cavity 111 and connects the second flow port 1435 to the second liquid injection channel 1423.

[0111] Understandably, this application provides a sub-reinforcing part 1434 on the side of the sub-blocking part 1421 near the electrode assembly 120, so as to further enhance the strength of the blocking part 142 by using the sub-reinforcing part 1434, thereby enhancing the overall strength of the insulating member 140, preventing the blocking part 142 from being damaged when the single cell 100 is filled with liquid, and ensuring the yield of the finished single cell 100.

[0112] Meanwhile, during electrolyte injection, the electrolyte in the single cell 100 flows from the injection hole 131 to the through hole 1411 and the second injection channel 1423, and then from the through hole 1411 and the second injection channel 1423 to the guide channel 1431. Part of the electrolyte in the guide channel 1431 flows from the opening 1432 into the receiving cavity 111, and another part of the electrolyte in the guide channel 1431 flows from the first guide port 1433 and the second guide port 1435 into the receiving cavity 111. This guides the electrolyte flow and further reduces the direct impact of the electrolyte on the electrode assembly 120 during electrolyte injection, thereby reducing the shedding of active materials on the positive and negative electrode plates in the electrode assembly 120 and reducing the safety hazards of the single cell 100.

[0113] In one embodiment, reference is made to Figures 3 to 6The insulating member 140 further includes a pressure relief boss 144, which is connected to the side of the insulating body 141 near the electrode assembly 120, and the pressure relief boss 144 and the through hole 1411 are spaced apart in the second direction X.

[0114] The insulating body 141 and the pressure relief boss 144 can be integrally formed, meaning they form a single structure. Alternatively, the insulating body 141 and the pressure relief boss 144 can be separately configured and fixedly connected to each other. For example, the pressure relief boss 144 is fixedly connected to the insulating body 141 using a snap-fit ​​process. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the insulating body 141 and the pressure relief boss 144 are integrally injection molded.

[0115] The single cell 100 also includes a pressure relief valve 160, which is disposed on the top cover 130. Along the first direction Z, the orthographic projection of the pressure relief valve 160 on the reference plane at least partially coincides with the orthographic projection of the pressure relief boss 144 on the reference plane, so as to ensure that the gas generated during thermal runaway of the single cell 100 is discharged efficiently.

[0116] Specifically, the distance between the pressure relief boss 144 and the through hole 1411 is L2 mm, and the dimension of the insulating body 141 in the second direction X is L4 mm, satisfying: 0.005 ≤ L2 / L4 ≤ 0.833. That is, the ratio of the distance L2 mm between the pressure relief boss 144 and the through hole 1411 and the dimension L4 mm of the insulating body 141 in the second direction X can be controlled within the range of 0.005 to 0.833. For example, L2 / L4 can be one of 0.005, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.833, or any combination thereof. The specific values ​​of L2 / L4 given above are only illustrative examples, and any value within the range of 0.005 to 0.833 is within the protection scope of this application.

[0117] This application limits the ratio of the distance L2 mm between the pressure relief boss 144 and the through hole 1411 to the dimension L4 mm of the insulating body 141 in the second direction X to be within the range of 0.005 to 0.833. This allows for a more reasonable design of the structural dimensions of the insulating member 140, preventing the distance between the pressure relief boss 144 and the through hole 1411 from being too close. This would cause the electrolyte to impact the pressure relief valve 160 during the filling of the single cell 100, leading to the loosening of the pressure relief valve 160 and affecting its normal use. This ensures the safety performance of the single cell 100 and also guarantees the yield of the finished single cell 100.

[0118] The distance L2 mm between the pressure relief boss 144 and the through hole 1411 can be obtained by disassembling the actual single cell 100 and measuring the distance between the outer wall of the pressure relief boss 144 near the through hole 1411 and the hole wall of the through hole 1411 near the pressure relief boss 144 multiple times using a measuring tool, and then calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to these.

[0119] The dimension L4 mm of the insulating body 141 in the second direction X can be obtained by disassembling the actual single cell 100 and measuring the distance between the two relatively positioned outer walls of the insulating body 141 in the second direction X multiple times using a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to this.

[0120] In one embodiment, to ensure the safety performance of the single battery cell 100, the distance L2 mm between the pressure relief boss 144 and the through hole 1411 in this application also satisfies: 3 ≤ L2 ≤ 500. That is, the distance L2 mm between the pressure relief boss 144 and the through hole 1411 can be controlled within the range of 3 mm to 500 mm. For example, L2 mm can be one or any combination of 3 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, or 500 mm. The specific values ​​of L2 mm mentioned above are only given as examples, and any value within the range of 3 mm to 500 mm is within the protection scope of this application.

[0121] This application limits the distance L2 mm between the pressure relief boss 144 and the through hole 1411 to within the range of 3 mm to 500 mm, so as to further rationally design the structural dimensions of the insulating component 140. This further avoids the pressure relief boss 144 and the through hole 1411 being too close, which could cause the pressure relief valve 160 to loosen due to the impact of the electrolyte on the pressure relief valve 160 during the filling of the single cell 100, thus affecting the normal use of the pressure relief valve 160. This further ensures the safety performance of the single cell 100 and guarantees the yield of the finished single cell 100.

[0122] In one embodiment, the dimension L4 mm of the insulating body 141 in the second direction X further satisfies: 10 ≤ L4 ≤ 600. That is, the dimension L4 mm of the insulating body 141 in the second direction X can be controlled within the range of 10 mm to 600 mm. For example, L4 mm can be one or any combination of 10 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, or 600 mm. The specific values ​​of L4 mm given above are merely illustrative, and any value within the range of 10 mm to 600 mm is within the protection scope of this application.

[0123] In one embodiment, reference is made to Figures 3 to 6 The single cell 100 also includes: a terminal post 150, which is disposed on the top cover 130, and a portion of the terminal post 150 passes through the insulating body 141. The terminal post 150 is electrically connected to the electrode assembly 120, and a through hole 1411 is located between the terminal post 150 and the pressure relief boss 144.

[0124] The terminal 150 can be either a positive terminal or a negative terminal. This application does not make specific limitations and can be set according to the actual situation.

[0125] Specifically, to ensure the structural stability of the single cell 100, in this application, the distance between the electrode post 150 and the through hole 1411 is L3 mm, satisfying: 0.0067 ≤ L3 / L4 ≤ 0.8333. That is, the ratio of the distance L3 mm between the electrode post 150 and the through hole 1411 to the dimension L4 mm of the insulating body 141 in the second direction X can be controlled within the range of 0.0067 to 0.8333. For example, L3 / L4 can be one of 0.0067, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.8333, or any combination thereof. The specific values ​​of L3 / L4 given above are only illustrative examples, and any value within the range of 0.0067 to 0.8333 is within the protection scope of this application.

[0126] This application limits the ratio of the distance L3 mm between the terminal post 150 and the through hole 1411 to the dimension L4 mm of the insulating body 141 in the second direction X to be within the range of 0.0067 to 0.8333, so as to further rationally design the structural dimensions of the insulating member 140, ensure the overall flatness of the insulating member 140, and thus ensure the tight assembly between the insulating member 140 and the top cover 130, and ensure the structural stability between the components of the single cell 100.

[0127] The distance L3 mm between the terminal post 150 and the through hole 1411 can be obtained by disassembling the actual single cell 100 and measuring the distance between the outer wall of the terminal post 150 near the through hole 1411 and the hole wall of the through hole 1411 near the terminal post 150 multiple times using a measuring tool, and then calculating the average value. The measuring tool can be any one of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to this.

[0128] In one embodiment, the distance L3 mm between the electrode post 150 and the through hole 1411 also satisfies: 4 ≤ L3 ≤ 500. That is, the distance L3 mm between the electrode post 150 and the through hole 1411 can be controlled within the range of 4 mm to 500 mm. For example, L3 mm can be one or any combination of 4 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, or 500 mm. The specific values ​​of L3 mm given above are only illustrative examples, and any value within the range of 4 mm to 500 mm is within the protection scope of this application.

[0129] This application limits the distance L3 mm between the terminal post 150 and the through hole 1411 to a range of 4 mm to 500 mm, so as to further rationally design the structural dimensions of the insulating member 140, further ensure the overall flatness of the insulating member 140, further ensure the tight assembly between the insulating member 140 and the top cover 130, and ensure the structural stability between the components of the single cell 100.

[0130] In another embodiment, reference is made to Figure 14 This application also provides a battery pack, including: a housing 200, a single battery 100 as described in any of the above embodiments, and a cover 300; the single battery 100 is disposed inside the housing 200, and the cover 300 is disposed on one side of the housing 200 in the first direction Z to seal the housing 200.

[0131] The battery pack can be a three-tiered system consisting of individual battery cells 100, battery modules, and a battery pack. This means that the individual battery cells 100 are first grouped into battery modules, and then the battery modules are placed inside the housing 200 to form a battery pack. Alternatively, it can be a two-tiered system consisting of individual battery cells 100 and a battery pack, where the individual battery cells 100 are directly housed inside the housing 200 to form a battery pack. No specific limitations are imposed in this application; the design can be tailored to the specific circumstances, as long as it does not affect the effectiveness of this application.

[0132] On the other hand, in embodiments of this application, an electrical device is also provided, including a battery pack as described above, which serves as the power supply for the electrical device. The electrical device may be, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0133] To better understand the technical solution of this application, the following explanation uses a lithium-ion battery as an example.

[0134] This example provides a method for preparing a lithium-ion battery, the specific process of which is as follows:

[0135] 1. Preparation of positive electrode sheet

[0136] Lithium iron phosphate, conductive carbon black (SP), and polyvinylidene fluoride (PVDF) were mixed in a mass ratio of 96:2:2. N-methylpyrrolidone (NMP) was then added as a solvent and mixed. The mixture was stirred under vacuum until it became homogeneous, thus obtaining a positive electrode slurry. The positive electrode slurry was then uniformly coated on both sides of a positive electrode current collector aluminum foil and then transferred to a 120°C oven for drying. After rolling, slitting, and cutting, the positive electrode sheet was obtained.

[0137] 2. Preparation of negative electrode sheet

[0138] The negative electrode active material graphite, conductive agent conductive carbon black (SP), thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber (SBR) were mixed in a mass ratio of 96.2:1.2:1.2:1.4. Then, deionized water was added as a solvent for mixing. The mixture was stirred under vacuum until the system became homogeneous, thus obtaining the negative electrode slurry. The negative electrode slurry was uniformly coated on both sides of the negative electrode current collector copper foil, and then transferred to a 110°C oven for drying. After that, the negative electrode sheets were obtained by rolling, slitting, and cutting.

[0139] 3. Preparation of electrolyte

[0140] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed in a mass ratio of 3:4:3 to obtain an organic solvent. 1 mQl / L of LiPF6 was added and mixed thoroughly. Then, vinylene carbonate, ethylene sulfate, and lithium difluorophosphate were added to prepare the electrolyte.

[0141] 4. Preparation of the diaphragm

[0142] PP film is used as the separator.

[0143] 5. Preparation of lithium-ion batteries

[0144] After drying, the negative and positive electrode sheets prepared by the above steps are used together with the separator to prepare a wound electrode assembly using a winding machine. The positive and negative electrode tabs are welded to the top cover, and the welded electrode assembly with the top cover is placed into an aluminum shell for encapsulation. After filling with electrolyte and forming and fixing the volume, a lithium-ion battery is obtained.

[0145] The lithium-ion batteries in each example were prepared according to the above-described preparation method. The structural dimensions and performance test data of each example are shown in Tables 1, 2 and 3.

[0146] The lithium-ion batteries prepared in the above example were subjected to performance testing. The specific testing methods are as follows:

[0147] 1. Test method for electrolyte filling efficiency of lithium-ion batteries

[0148] Using the insulating component described in this application, the lithium-ion battery is placed in a liquid injection machine. The machine first evacuates the lithium-ion battery to a pressure below -90 kPa, at which point the electrolyte is stored in the injection cup. Due to the negative pressure inside the lithium-ion battery, the electrolyte flows into the battery. The machine then cycles the lithium-ion battery with alternating positive and negative pressure (positive pressure 180 kPa (30-60 s), negative pressure -60 kPa (3-15 s), 4-12 times) to ensure sufficient electrolyte injection. The total injection time is recorded as T min. Alternatively, using a conventional insulating component (i.e., without any structure at the through-hole of the insulating component), the same injection operation is performed, and the total injection time is recorded as t min. The injection efficiency is calculated as t / T × 100%.

[0149] 2. Test methods for the voltage of lithium-ion batteries

[0150] At 25°C, the positive and negative terminals of a lithium-ion battery are electrically connected to a short-circuit voltmeter, and the voltage value of the lithium-ion battery is measured using the short-circuit voltmeter.

[0151] 3. Test method for the detonation pressure of lithium-ion battery pressure relief valve

[0152] Insert the connecting tube with the external pressure gauge into the injection hole and seal the injection hole. Use the connecting tube to fill the lithium-ion battery with helium and record the pressure displayed on the pressure gauge when the pressure relief valve detonates.

[0153] 4. Test method for the flatness of insulating components in lithium-ion batteries

[0154] After the prepared lithium-ion battery is left to stand for a period of time, it is disassembled. The disassembled insulating component is placed on a platform, and the base of the height gauge is placed on the platform. The sliding rod of the height gauge is adjusted so that it contacts the surface between the through hole and the terminal of the insulating component. The height gauge is moved and the readings of multiple points are recorded. The flatness of the surface of the insulating component is calculated by calculating the difference between the maximum and minimum readings.

[0155] Table 1 shows the effect of the parameter relationship between the dimension L1 mm of the blocking part 142 in the radial direction P and the maximum outline dimension D mm of the through hole 1411 on the lithium-ion battery.

[0156] Table 1. Parameters and test results for Examples 1-26

[0157]

[0158]

[0159] As shown in Table 1, in Example 25, the specific parameters of the lithium-ion battery exceed the parameter range specified in this application. Compared to the lithium-ion batteries in Examples 1 to 24, the electrolyte injection efficiency of the lithium-ion battery in Example 25 is significantly reduced, the electrolyte injection effect is poor, and the lithium-ion battery does not exhibit the corresponding performance, thus failing to meet the requirements. In Example 26, the specific parameters of the lithium-ion battery exceed the parameter range specified in this application. Compared to the lithium-ion batteries in Examples 1 to 24, although the electrolyte injection efficiency of the lithium-ion battery in Example 26 is higher, the voltage value of the lithium-ion battery in Example 26 decreases, the lithium-ion battery experiences a short circuit, and the lithium-ion battery does not exhibit the corresponding performance, thus failing to meet the requirements.

[0160] Therefore, this application limits the orthographic projection area S1mm of each blocking part 142 on the reference plane O. 2 The orthographic projection area S2 mm of the hole wall 1412 of the through hole 1411 onto the reference plane O 2 The ratio is in the range of 0.002 to 0.166, limiting the orthogonal projection area S1 mm of each blocking part 142 along the first direction Z on the reference plane O. 2 At 0.424mm 2 ~12.162mm 2 Within the range, the orthogonal projection area S2 mm of the hole wall 1412 of the through hole 1411 along the first direction Z on the reference plane O 2 At 7.065mm 2 ~254.34mm 2Within a certain range, the ratio of the radial dimension L1 mm of the blocking part 142 in the radial direction P to the maximum outline dimension D mm of the through hole 1411 is limited to the range of 0.02 to 0.47. By limiting the radial dimension L1 mm of the blocking part 142 in the radial direction P to the range of 0.3 mm to 1.4 mm, and by limiting the maximum outline dimension D mm of the through hole 1411 to the range of 3 mm to 18 mm, the structural dimensions between the blocking part 142 and the through hole 1411 are reasonably designed to ensure efficient flow of electrolyte through the through hole 1411 during electrolyte filling of the single cell 100, thus ensuring the electrolyte filling efficiency of the single cell 100. At the same time, it ensures that the blocking part 142 can effectively block the overlapping area of ​​the top cover 130 and the through hole 1411, preventing the electrode tab of the electrode assembly 120 from extending into the through hole 1411 and contacting the top cover 130, which would cause a short circuit in the single cell 100. This reduces the risk of short circuit between the electrode assembly 120 and the top cover 130 and ensures the safety performance of the single cell 100.

[0161] Table 2 shows the effect of the parameter relationship between the distance L2 mm between the pressure relief boss 144 and the through hole 1411 and the dimension L4 mm of the insulating body 141 in the second direction X on the lithium-ion battery.

[0162] Table 2 Parameters and Test Results for Examples 27-40

[0163] [L2 / mm] [L4 / mm] [L2 / L4] Relief valve burst pressure / Mpa Example 27 3 600 0.005 0.9 Example 28 200 600 0.333 0.94 Example 29 500 600 0.833 0.98 Example 30 3 10 0.3 0.88 Example 31 3.5 60 0.058 0.89 Example 32 4 120 0.033 0.96 Example 33 12.5 148 0.084 0.94 Example 34 22.5 160 0.141 0.97 Example 35 35 173 0.202 0.89 Example 36 100 194 0.515 0.87 Example 37 150 200 0.75 0.85 Example 38 45 280 0.161 0.92 Example 39 9.8 300 0.033 0.91 Example 40 0.5 600 0.0008 0.5

[0164] As can be seen from the data in Table 2, in Example 40, the specific parameters of the lithium-ion battery exceed the parameter range in this application. Compared with the lithium-ion batteries in Examples 27 to 39, the pressure relief valve explosion pressure of the lithium-ion battery in Example 40 is significantly reduced, the safety performance of the lithium-ion battery is poor, and the lithium-ion battery does not exhibit the corresponding performance and does not meet the requirements.

[0165] Therefore, this application limits the ratio of the distance L2 mm between the pressure relief boss 144 and the through hole 1411 to the dimension L4 mm of the insulating body 141 in the second direction X to be within the range of 0.005 to 0.833, and limits the distance L2 mm between the pressure relief boss 144 and the through hole 1411 to be within the range of 3 mm to 500 mm, so as to reasonably design the structural dimensions of the insulating member 140. This avoids the distance between the pressure relief boss 144 and the through hole 1411 being too close, which would cause the electrolyte to impact the pressure relief valve 160 during the filling of the single cell 100, causing the pressure relief valve 160 to loosen and thus affecting the normal use of the pressure relief valve 160, thereby ensuring the safety performance of the single cell 100.

[0166] Table 3 shows the effect of the parameter relationship between the distance L3 mm between the terminal post 150 and the through hole 1411 and the dimension L4 mm of the insulating body 141 in the second direction X on the lithium-ion battery.

[0167] Table 3 Parameters and test results for Examples 41-56

[0168]

[0169]

[0170] As can be seen from the data in Table 3, in Example 56, the specific parameters of the lithium-ion battery exceed the parameter range in this application. Compared with the lithium-ion batteries of Examples 41 to 55, the flatness of the insulating member 140 in the lithium-ion battery of Example 56 is significantly increased, and the planar deformation of the insulating member 140 is large. The lithium-ion battery does not exhibit the corresponding performance and does not meet the requirements.

[0171] Therefore, this application limits the ratio of the distance L3 mm between the electrode post 150 and the through hole 1411 to the dimension L4 mm of the insulating body 141 in the second direction X to be within the range of 0.0067 to 0.8333, and limits the distance L3 mm between the electrode post 150 and the through hole 1411 to be within the range of 4 mm to 500 mm, so as to reasonably design the structural dimensions of the insulating member 140, ensure the overall flatness of the insulating member 140, and thus ensure the tight assembly between the insulating member 140 and the top cover 130, and ensure the structural stability between the components of the single cell 100.

[0172] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A single-cell battery having a first orientation, characterized in that, include: The housing has a receiving cavity; The electrode assembly is disposed within the receiving cavity; A top cover is connected to one side of the housing in the first direction and seals the receiving cavity, and the top cover is provided with a liquid injection hole; as well as An insulating component includes: an insulating body and a plurality of blocking portions. The insulating body is connected to the top cover on the side near the electrode assembly. The insulating body has a through hole with a hole wall and communicates with the injection hole. The through hole has a radial direction perpendicular to the first direction and a circumferential direction around the first direction. The plurality of blocking portions are all connected to the hole wall. In the radial direction, the blocking portions extend along the hole wall toward the center of the through hole, and the plurality of blocking portions are spaced apart in the circumferential direction. Two adjacent blocking portions and the hole wall together form a first injection channel, which communicates the injection hole with the receiving cavity.

2. The single-cell battery as described in claim 1, characterized in that, The single cell also has a reference plane perpendicular to the first direction; Along the first direction, the orthographic projection area of ​​each of the blocking portions on the reference plane is S1mm. 2 The orthographic projection area of ​​the hole wall on the reference plane is S² mm. 2 The condition is satisfied that: 0.002 ≤ S1 / S2 ≤ 0.166; or, Along the first direction, the orthographic projection area of ​​each of the blocking portions on the reference plane is S1mm. 2 The orthographic projection area of ​​the hole wall on the reference plane is S² mm. 2 The condition is satisfied that 0.037≤S1 / S2≤0.

1.

3. The single-cell battery as described in claim 2, characterized in that, Along the first direction, the orthographic projection area of ​​each of the blocking portions on the reference plane is S1 mm. 2 It also satisfies: 0.424≤S1≤12.162; and / or, The orthographic projection area of ​​the hole wall on the reference plane is S2 mm. 2 It also satisfies: 7.065≤S2≤254.

34.

4. The single-cell battery as described in claim 2, characterized in that, The dimension of the blocking part in the radial direction is L1 mm, and the maximum outline dimension of the through hole is D mm, satisfying: 0.02 ≤ L1 / D ≤ 0.47; or, The radial dimension L1 mm of the blocking part and the maximum profile dimension D mm of the through hole also satisfy: 0.06≤L1 / D≤0.

18.

5. The single-cell battery as described in claim 4, characterized in that, The radial dimension L1 mm of the blocking part also satisfies: 0.3 ≤ L1 ≤ 1.4; and / or, The maximum outline dimension D mm of the through hole also satisfies: 3≤D≤18.

6. The single-cell battery as described in claim 1, characterized in that, The insulating component further includes: a plurality of reinforcing parts, each of the reinforcing parts being connected to a corresponding blocking part on the side near the electrode assembly; the plurality of reinforcing parts enclosing each other to form an open flow channel; the flow channel communicating with the through hole; the open connecting the flow channel to the receiving cavity; the plurality of reinforcing parts being spaced apart in the circumferential direction; a first flow port being formed between two adjacent reinforcing parts; the first flow port communicating with the flow channel to the receiving cavity; and the first flow port communicating with the first liquid injection channel.

7. The single-cell battery as described in claim 6, characterized in that, The through hole has a central axis that extends along the first direction, and the radius of the through hole intersects the central axis. The plurality of blocking portions are arranged symmetrically about the central axis, and the plurality of reinforcing portions are arranged symmetrically about the central axis.

8. The single-cell battery as described in claim 7, characterized in that, The reinforcing portion extends along the first direction; or... The reinforcing portion is inclined relative to the first direction, and in the first direction, along the direction of the insulating member toward the electrode assembly, the distance between the reinforcing portion and the central axis of the through hole decreases.

9. The single-cell battery as described in claim 6, characterized in that, The blocking part includes: a plurality of sub-blocking parts, the plurality of sub-blocking parts being arranged at intervals along the circumferential direction, and a second injection channel being formed between two adjacent sub-blocking parts; The reinforcing part includes: a plurality of sub-reinforcing parts, each of the sub-reinforcing parts being connected to a corresponding sub-blocking part on the side near the electrode assembly, and the plurality of sub-reinforcing parts being spaced apart along the circumferential direction, with a second flow guide forming between two adjacent sub-reinforcing parts, the second flow guide communicating the flow guide channel with the receiving cavity, and the second flow guide communicating with the second liquid injection channel.

10. The single-cell battery as described in claim 1, characterized in that, The single cell also has a second direction intersecting the first direction; The insulating component further includes: a pressure relief boss connected to the side of the insulating body near the electrode assembly, and the pressure relief boss and the through hole are spaced apart in the second direction; The distance between the pressure relief boss and the through hole is L2 mm, and the dimension of the insulating body in the second direction is L4 mm, satisfying: 0.005≤L2 / L4≤0.

833.

11. The single-cell battery as described in claim 10, characterized in that, The distance L2mm between the pressure relief boss and the through hole also satisfies: 3≤L2≤500; and / or, The dimension L4 mm of the insulating body in the second direction also satisfies: 10≤L4≤600.

12. The single-cell battery as described in claim 10, characterized in that, The single battery cell further includes: an electrode post connected to the top cover, and a portion of the electrode post passing through the insulating body and electrically connected to the electrode assembly; the through hole is located between the electrode post and the pressure relief boss. The distance between the pole and the through hole is L3 mm, which satisfies: 0.0067≤L3 / L4≤0.8333.

13. The single-cell battery as described in claim 12, characterized in that, The distance L3 mm between the pole post and the through hole also satisfies: 4≤L3≤500.

14. A battery pack, characterized in that, include: Box; as well as The single-cell battery as described in any one of claims 1 to 13, wherein the single-cell battery is disposed within the housing.

Images