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 which is provided with a containing cavity with an opening; the electrode assembly is arranged in the accommodating cavity; the top cover unit comprises a top cover and an insulating part which are connected, the top cover covers the opening, a liquid injection hole is formed in the top cover, and the insulating part is arranged on the side, close to the electrode assembly, of the top cover; the insulating part is provided with a through hole, the through hole is communicated with the containing cavity and the liquid injection hole, and the through hole and the liquid injection hole are arranged in a staggered mode. According to the invention, the electrode assembly is prevented from being directly impacted by gas during detection or electrolyte during liquid injection of the single battery, so that active materials on the positive plate and the negative plate in the electrode assembly are prevented from falling off, the potential safety hazard of the single battery is reduced, and the safety performance of the single battery is finally improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] With the rapid development of mobile phones, laptops, electric vehicles, power tools, and other devices, secondary batteries with high capacity, long cycle life, and high safety performance have been widely used and developed. At the same time, there is an urgent demand for secondary batteries with larger capacity, longer durability, and higher safety. Safety performance is one of the core performance characteristics of secondary batteries. Therefore, how to improve the safety performance of secondary batteries has become a pressing issue. Utility Model Content

[0003] The embodiments of the present application provide a single cell battery and a battery pack to improve the safety performance of the single cell battery.

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

[0005] In one aspect, a single cell battery is provided, comprising: a housing having a receiving cavity with an opening;

[0006] an electrode assembly disposed in the accommodating cavity; and

[0007] The top cover unit includes: a connected top cover and an insulating member, the top cover is arranged on the opening, and a liquid injection hole is opened on the top cover, and the insulating member is arranged on a side of the top cover close to the electrode assembly;

[0008] The insulating member is provided with a through hole, which is communicated with the accommodating cavity and the liquid injection hole respectively, and the through hole and the liquid injection hole are staggered.

[0009] In addition to or as an alternative to one or more features disclosed above, the battery cell has a first direction and a reference plane perpendicular to the first direction;

[0010] The injection hole has a first hole wall, and the through hole has a second hole wall. Along the first direction, the orthographic projection of the first hole wall on the reference plane and the orthographic projection of the second hole wall on the reference plane do not overlap with each other.

[0011] In addition to or as an alternative to one or more of the features disclosed above,

[0012] The insulating member includes: an insulating body, which is arranged on a side of the top cover close to the electrode assembly;

[0013] The convex portion is convexly provided on a side of the insulating body close to the electrode assembly, and the convex portion is provided on a side of the liquid injection hole close to the electrode assembly;

[0014] A groove is provided on one side of the convex portion away from the electrode assembly. A through hole is provided on the convex portion, and the through hole is communicated with the groove, and the groove is communicated with the liquid injection hole.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the single battery further has a second direction intersecting the first direction;

[0016] The convex portion includes: a first side wall and a second side wall arranged opposite to each other in the second direction, and a third side wall, the third side wall being connected to the first side wall and the second side wall respectively, and the third side wall being arranged on a side of the first side wall away from the liquid injection hole;

[0017] The through hole is opened in at least one of the first side wall, the second side wall and the third side wall.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the single battery further has a third direction intersecting the first direction and the second direction in pairs;

[0019] The top cover has a first outer wall and a second outer wall arranged opposite to each other in the third direction;

[0020] The distance between the injection hole and the first outer wall is H1 mm, and the distance between the injection hole and the second outer wall is H2 mm, satisfying: H1=H2.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the single battery further has a third direction intersecting the first direction and the second direction in pairs;

[0022] The top cover has a first outer wall and a second outer wall arranged opposite to each other in the third direction;

[0023] The distance between the injection hole and the first outer wall is H1 mm, and the distance between the injection hole and the second outer wall is H2 mm, satisfying: H1<H2, or H1>H2.

[0024] In addition to or as an alternative to one or more of the features disclosed above,

[0025] The top cover further comprises a third outer wall and a fourth outer wall arranged opposite to each other in the second direction, wherein the third outer wall is arranged relative to the fourth outer wall and close to the first side wall;

[0026] The distance between the injection hole and the third outer wall is H3 mm, and the distance between the injection hole and the fourth outer wall is H4 mm, satisfying: H3=H4.

[0027] In addition to or as an alternative to one or more features disclosed above, a plurality of through holes are provided, and the plurality of through holes are spaced apart in the third direction;

[0028] The distance between the through hole and the third outer wall is H5 mm, and the distance between the through hole and the fourth outer wall is H6 mm, satisfying: H5<H6; or, H5>H6.

[0029] In addition to one or more features disclosed above, or as an alternative, a plurality of through holes are provided, the plurality of through holes are spaced apart in the third direction, and a portion of the plurality of through holes is provided close to the fourth outer wall relative to the third outer wall, and another portion of the plurality of through holes is provided close to the third outer wall relative to the fourth outer wall.

[0030] On the other hand, a battery pack is further disclosed. In addition to or as an alternative to one or more of the features disclosed above, the battery pack includes: a box; and a single battery as described in any one of the above items, wherein the single battery is arranged in the box.

[0031] One of the above technical solutions has the following advantages or beneficial effects: the present application staggers the through hole on the insulating part and the injection hole on the top cover, so that the projection area of the through hole in the first direction does not overlap with the projection area of the injection hole in the first direction, so that when the single cell is tested, the gas flows through the injection hole and is buffered before flowing through the through hole into the accommodating cavity, and when the single cell is injected, the electrolyte flows through the injection hole and is buffered before flowing through the through hole into the accommodating cavity, so as to avoid the gas of the single cell during testing or the electrolyte during injection directly impacting the electrode assembly, thereby avoiding the falling off of the active materials on the positive and negative electrodes in the electrode assembly, reducing the safety hazards of the single cell, and ultimately improving the safety performance of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0033] Figure 1 is a schematic structural diagram of a single cell provided according to an embodiment of the present application;

[0034] Figure 2 This is an exploded structural view of a top cover unit provided according to a first specific embodiment of the present application;

[0035] Figure 3 This is an exploded structural view of the top cover unit provided in accordance with the first specific embodiment of the present application from another perspective;

[0036] Figure 4 is a top view of a top cover unit provided according to a first specific embodiment of the present application;

[0037] Figure 5 is a cross-sectional view of the top cover unit along the AA direction provided in accordance with the first specific embodiment of the present application;

[0038] Figure 6 is a cross-sectional view of the top cover unit along the BB direction provided in the first specific embodiment of the present application;

[0039] Figure 7 is a bottom view of the top cover unit provided according to the first specific embodiment of the present application;

[0040] Figure 8 This is an exploded structural view of a top cover unit provided according to the second specific embodiment of the present application;

[0041] Figure 9 This is an exploded structural view of a top cover unit provided according to the third specific embodiment of the present application;

[0042] Figure 10 This is an exploded structural view of the top cover unit from another perspective according to the third specific embodiment of the present application;

[0043] Figure 11 is a bottom view of a top cover unit provided according to specific embodiment 3 of the present application;

[0044] Figure 12 This is an exploded structural view of a top cover unit provided according to a fourth specific embodiment of the present application;

[0045] Figure 13 This is an exploded structural view of a top cover unit from another perspective according to the fourth specific embodiment of the present application;

[0046] Figure 14 It is a schematic structural diagram of a battery pack provided according to an embodiment of the present application.

[0047] Description of reference numerals:

[0048] 100. Single cell;

[0049] 110. Housing; 111. Accommodating chamber;

[0050] 120. Electrode assembly;

[0051] 130. Top cover unit; 131. Top cover; 1311. Liquid injection hole; 1312. First outer wall; 1313. Second outer wall; 1314. Third outer wall; 1315. Fourth outer wall; 1316. Positioning hole; 132. Insulator; 1321. Insulating body; 1322. Protrusion; 13221. First side wall; 13222. Second side wall; 13223. Third side wall; 1323. Groove; 1324. Through hole; 1325. Positioning portion;

[0052] 140, pole;

[0053] 150. Riveted parts;

[0054] 160, seals;

[0055] 200, box;

[0056] 300. Box cover. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0060] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the existing secondary battery, the lower plastic is provided with a through hole at the orthographic projection of the injection hole to facilitate the electrolyte injection operation. However, the above structure causes the gas and electrolyte to directly impact the electrode assembly during testing and injection of the secondary battery, which can easily cause the positive and negative electrode materials of the positive and negative plates in the electrode assembly to fall off, posing a serious safety hazard to the secondary battery; secondly, the injection hole on the top cover of the existing secondary battery is usually not set in the middle area of the top cover, but is generally set close to the positive electrode column or the negative electrode column, and there is no structure such as a pole ear that will hinder the airflow and liquid channel near the injection hole, resulting in the inability to set the pole ear in the area from the injection hole to the center of the top cover, which limits the width of the pole ear and thus limits the overcurrent capacity of the entire battery. Under high current conditions, it may cause the temperature at the pole ear to rise too high, affecting the battery life and safety.

[0062] In order to solve the above problems, in the embodiments of the present application, referring to Figures 1 to 13 The present application provides a single battery 100 having a first direction Z, a second direction Y, and a third direction X intersecting each other. Exemplarily, the single battery 100 has a first direction Z, a second direction Y, and a third direction X perpendicular to each other.

[0063] Here, “perpendicular” refers to a state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0064] The first direction Z is the height direction of the single battery 100 , the second direction Y is the length direction of the single battery 100 , and the third direction X is the width direction of the single battery 100 .

[0065] Specifically, the single battery 100 includes a housing 110 , an electrode assembly 120 and a top cover unit 130 .

[0066] Specifically, the shell 110 is provided with a accommodating cavity 111 with an opening; the electrode assembly 120 is arranged in the accommodating cavity 111; the top cover unit 130 includes: a connected top cover 131 and an insulating member 132, the top cover 131 is covered on the opening, and a liquid injection hole 1311 is opened on the top cover 131, and the insulating member 132 is arranged on the side of the top cover 131 close to the electrode assembly 120.

[0067] The single cell 100 may be a secondary battery, which refers to a single cell that can be recharged to activate the active material after discharge and continue to be used. For example, the single cell 100 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, but is not limited thereto.

[0068] The single battery 100 may be a prismatic battery, a soft pack battery, or a battery in another shape.

[0069] The housing 110 may be made of a strong material such as metal, but is not limited thereto. For example, the housing 110 may be made of an aluminum profile, but is not limited thereto.

[0070] The top cover 131 can be integrally formed with the housing 110, that is, the top cover 131 can be the outer wall of the housing 110; the top cover 131 can also be fixedly connected to the housing 110, for example: the top cover 131 is fixedly connected to one end of the housing 110 in the second direction Z by a process such as welding. This is not specifically limited in this application and can be specifically configured according to actual circumstances. For example, in this application, the top cover 131 is provided separately from the housing 110, and the top cover 131 and the housing 110 are fixed by welding.

[0071] The insulating member 132 may be made of rubber, silicone, plastic, etc., but is not limited thereto.

[0072] Among them, the above-mentioned single cell 100 also includes an electrolyte, a pole and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives added. The electrolyte is used to soak the electrode assembly 120. Among them, the electrode assembly 120 is a component where the electrochemical reaction occurs in the single cell 100, 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 diaphragm and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body of the electrode assembly 120, and the parts of the positive electrode sheet and the negative electrode sheet without active substances constitute the tabs. During the charge and discharge process of the single cell 100, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tabs are electrically connected to the pole 140 to form a current loop, so that the single cell 100 can be used normally.

[0073] Specifically, a through hole 1324 is provided on the insulating part 132, and the through hole 1324 is connected to the accommodating cavity 111 and the injection hole 1311 respectively, and the through hole 1324 and the injection hole 1311 are staggered, that is, the projection area of the through hole 1324 in the first direction Z does not overlap with the projection area of the injection hole 1311 in the first direction Z, so that when the single battery 100 is detected, the gas flows through the injection hole 1311 and is buffered before flowing through the through hole 1324 into the accommodating cavity 111, and when the single battery 100 is injected, the electrolyte flows through the injection hole 1311 and is buffered before flowing through the through hole 1324 into the accommodating cavity 111, so as to avoid the gas of the single battery 100 during detection or the electrolyte during injection from directly impacting the electrode assembly 120, thereby avoiding the falling off of the active materials on the positive and negative plates in the electrode assembly 120, reducing the safety hazards of the single battery 100, and ultimately improving the safety performance of the single battery 100.

[0074] The through hole 1324 may be of any shape. For example, in the present application, the through hole 1324 is circular to facilitate the processing and forming of the through hole 1324 .

[0075] In one embodiment, a sealing member (not shown) is further provided at the liquid injection hole 1311 to seal the liquid injection hole 1311 , thereby sealing the single battery 100 as a whole and ensuring normal use of the single battery 100 .

[0076] In one embodiment, the battery cell further has a reference plane P perpendicular to the first direction Z.

[0077] The injection hole 1311 has a first hole wall, and the through hole 1324 has a second hole wall. Along the first direction Z, the orthographic projection of the first hole wall of the injection hole 1311 on the reference plane P and the orthographic projection of the second hole wall of the through hole 1324 on the reference plane P do not overlap with each other, that is, the injection hole 1311 and the through hole 1324 are completely staggered, so that when the single battery 100 is tested, the gas flows through the injection hole 1311 and is buffered before flowing through the through hole 1324 into the accommodating cavity 111. When the single battery 100 is injected, the electrolyte flows through the injection hole 1311 and is buffered before flowing through the through hole 1324 into the accommodating cavity 111, so as to avoid the gas of the single battery 100 during testing or the electrolyte during injection from directly impacting the electrode assembly 120, thereby avoiding the falling off of the active materials on the positive and negative electrode sheets in the electrode assembly 120, reducing the safety hazards of the single battery 100, and ultimately improving the safety performance of the single battery 100.

[0078] In one embodiment, referring to Figures 4 to 6 The insulating member 132 includes an insulating body 1321 and a protrusion 1322 .

[0079] The insulating body 1321 is arranged on the side of the top cover 131 close to the electrode assembly 120; the protrusion 1322 is protruding from the side of the insulating body 1321 close to the electrode assembly 120, and the protrusion 1322 is arranged on the side of the injection hole 1311 close to the electrode assembly 120; illustratively, in this application, the protrusion 1322 and the injection hole 1311 are arranged sequentially in the first direction Z.

[0080] Specifically, a groove 1323 is defined on a side of the convex portion 1322 away from the electrode assembly 120 , a through hole 1324 is defined on the convex portion 1322 , and the through hole 1324 is communicated with the groove 1323 , and the groove 1323 is communicated with the liquid injection hole 1311 .

[0081] The insulating body 1321 and the convex portion 1322 can be integrally formed, that is, the insulating body 1321 and the convex portion 1322 are an integral structure. For example, the insulating body 1321 and the convex portion 1322 are integrally injection molded. The insulating body 1321 and the convex portion 1322 can also be provided separately and fixedly connected to each other. For example, the convex portion 1322 is fixedly connected to the insulating body 1321 by an adhesive process. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the insulating body 1321 and the convex portion 1322 are integrally formed.

[0082] It is understandable that when the single battery 100 is being tested, the gas flows through the injection hole 1311 and then enters the groove 1323 , where it is buffered and has a reduced flow rate, and then flows through the through hole 1324 and enters the accommodating cavity 111 .

[0083] When the single battery 100 is injected with electrolyte, the electrolyte flows through the injection hole 1311 and then enters the groove 1323 , where it is buffered and has a reduced flow rate, and then flows through the through hole 1324 and enters the accommodating cavity 111 .

[0084] The present application provides a groove 1323 to connect the through hole 1324 with the injection hole 1311 through the groove 1323, thereby further preventing the gas of the single battery 100 during detection or the electrolyte during injection from directly impacting the electrode assembly 120, thereby avoiding the falling off of the active materials on the positive and negative electrode sheets in the electrode assembly 120, reducing the safety hazards of the single battery 100, and ultimately improving the safety performance of the single battery 100.

[0085] In one embodiment, referring to Figures 4 to 6 The protrusion 1322 includes: a first side wall 13221 and a second side wall 13222 arranged opposite to each other in the second direction Y, and a third side wall 13223, the third side wall 13223 is respectively connected to the first side wall 13221 and the second side wall 13222, and the third side wall 13223 is arranged on the side of the first side wall 13221 away from the injection hole 1311.

[0086] Specifically, the through hole 1324 is defined in at least one of the first side wall 13221, the second side wall 13222, and the third side wall 13223. That is, the through hole 1324 may be defined in the first side wall 13221, the second side wall 13222, the third side wall 13223, the first side wall 13221 and the third side wall 13223, or the second side wall 13222 and the third side wall 13223, but the present invention is not limited thereto.

[0087] In the specific embodiment 1 of this application, refer to Figures 2 to 7 The top cover 131 has a first outer wall 1312 and a second outer wall 1313 that are arranged opposite to each other in the third direction X; the distance between the liquid injection hole 1311 and the first outer wall 1312 is H1 mm, and the distance between the liquid injection hole 1311 and the second outer wall 1313 is H2 mm, satisfying: H1=H2, that is, the distance H1 mm between the liquid injection hole 1311 and the first outer wall 1312 is equal to the distance H2 mm between the liquid injection hole 1311 and the second outer wall 1313, that is, in the third direction X, the liquid injection hole 1311 is located in the central area of the top cover 131, thereby ensuring that the structural dimensions of the tabs in the electrode assembly 120 can be reasonably designed, reducing the mutual influence between the two, ensuring the maximum current capacity of the tabs in the single battery 100, and thus ensuring the safety performance of the single battery 100.

[0088] The distance H1 mm between the liquid injection hole 1311 and the first outer wall 1312 can be obtained by disassembling the actual single battery 100, measuring the distance between the liquid injection hole 1311 on the top cover 131 and the first outer wall 1312 multiple times with a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instruments.

[0089] The distance H2 mm between the liquid injection hole 1311 and the second outer wall 1313 can be obtained by disassembling the actual single battery 100, measuring the distance between the liquid injection hole 1311 on the top cover 131 and the second outer wall 1313 multiple times with a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instruments.

[0090] In one embodiment, referring to Figure 4The top cover 131 further includes a third outer wall 1314 and a fourth outer wall 1315 disposed opposite each other in the second direction Y. The third outer wall 1314 is located closer to the first side wall 13221 than the fourth outer wall 1315. The distance between the injection hole 1311 and the third outer wall 1314 is H3 mm, and the distance between the injection hole 1311 and the fourth outer wall 1315 is H4 mm, satisfying the following equation: H3 = H4. That is, the distance H3 mm between the injection hole 1311 and the third outer wall 1314 is equal to the distance H4 mm between the injection hole 1311 and the fourth outer wall 1315. In other words, the injection hole 1311 is located in the center of the top cover 131 in the second direction Y. This further ensures that the structural dimensions of the tabs in the electrode assembly 120 can be rationally designed, minimizing any interaction between the tabs and the electrode assembly 120, ensuring the maximum current carrying capacity of the tabs in the battery cell 100, and further ensuring the safety of the battery cell 100.

[0091] The distance H3 mm between the liquid injection hole 1311 and the third outer wall 1314 can be obtained by disassembling the actual single battery 100, measuring the distance between the liquid injection hole 1311 on the top cover 131 and the third outer wall 1314 multiple times with a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instruments.

[0092] The distance H4 mm between the liquid injection hole 1311 and the fourth outer wall 1315 can be obtained by disassembling the actual single battery 100, measuring the distance between the liquid injection hole 1311 on the top cover 131 and the fourth outer wall 1315 multiple times with a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instruments.

[0093] In one embodiment, referring to Figures 2 to 7 There are multiple through holes 1324, and the multiple through holes 1324 are arranged at intervals in the third direction X.

[0094] Specifically, the distance between through-hole 1324 and third outer wall 1314 is H5 mm, and the distance between through-hole 1324 and fourth outer wall 1315 is H6 mm, satisfying the following: H5 < H6. That is, multiple through-holes 1324 are positioned closer to third outer wall 1314 than fourth outer wall 1315. This further ensures that the structural dimensions of the tabs in electrode assembly 120 can be rationally designed, minimizing any interaction between the tabs and the electrode assembly, ensuring the maximum current carrying capacity of the tabs in the battery cell 100, and thereby guaranteeing the safety performance of the battery cell 100.

[0095] The distance H5 mm between the through hole 1324 and the third outer wall 1314 can be obtained by disassembling the actual single battery 100, measuring the distance between the through hole 1324 on the top cover unit 130 and the third outer wall 1314 multiple times using a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instruments.

[0096] The distance H6 mm between the through hole 1324 and the fourth outer wall 1315 can be obtained by disassembling the actual single battery 100, measuring the distance between the through hole 1324 on the top cover unit 130 and the fourth outer wall 1315 multiple times using a measuring tool, and calculating the average value. The measuring tool can be any one of, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instrument.

[0097] In one embodiment, referring to Figures 2 to 3 A positioning portion 1325 is provided on one side of the insulating body 1321 close to the top cover 131 , and a positioning hole 1316 is opened on the top cover 131 . The positioning portion 1325 is embedded in the positioning hole 1316 to position and fix the top cover 131 and the insulating member 132 .

[0098] The insulating body 1321 and the positioning portion 1325 can be integrally formed, that is, the insulating body 1321 and the positioning portion 1325 are an integral structure. For example, the insulating body 1321 and the positioning portion 1325 are integrally injection molded. The insulating body 1321 and the positioning portion 1325 can also be provided separately and fixedly connected to each other. For example, the positioning portion 1325 is fixedly connected to the insulating body 1321 by an adhesive process. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the insulating body 1321 and the positioning portion 1325 are integrally formed.

[0099] The shapes of the positioning portion 1325 and the positioning hole 1316 are adapted to each other. Specifically, the shapes of the positioning portion 1325 and the positioning hole 1316 can be circular, polygonal, or other shapes, but are not limited thereto.

[0100] In the present application, the positioning portion 1325 and the positioning hole 1316 cooperate to achieve a fixed connection between the top cover 131 and the insulating member 132, so as to ensure a tight connection between the top cover 131 and the insulating member 132, prevent the top cover 131 and the insulating member 132 from loosening and causing a short circuit between the top cover 131 and other components, and ensure the normal use of the single cell 100.

[0101] In one embodiment, referring to Figure 5 The single battery 100 further includes: a terminal 140 , a rivet 150 and a sealing member 160 .

[0102] The terminal 140 is mounted on the top cover 131. The seal 160 is sleeved around the outer periphery of the terminal 140 and is located between the terminal 140 and the top cover 131 to seal the connection between the terminal 140 and the top cover 131, thereby ensuring the overall sealing effect of the single cell 100. The rivet 150 is sleeved around the outer periphery of the terminal 140 and is located on the side of the top cover 131 away from the electrode assembly 120. The rivet 150 and the terminal 140 are riveted together to position and fix the terminal 140, thereby tightly assembling the single cell 100 as a whole and eliminating the risk of component displacement and failure in the single cell 100. The rivet 150 is located on the side of the top cover 131 away from the electrode assembly 120 to prevent the rivet 150 from occupying the internal space of the housing 110, thereby increasing the space occupancy rate of the electrode assembly 120 within the housing 110 and thereby increasing the energy density of the single cell 100.

[0103] Among them, the pole 140 is considered to be a positive pole, and can also be a negative pole. There is no specific limitation in this application, and it can be selected according to actual circumstances.

[0104] The pole 140 can be made of conductive metal or other materials, but is not limited thereto. For example, the pole 140 can be made of copper or aluminum, but is not limited thereto.

[0105] The rivet 150 can be made of insulating material. For example, the rivet 150 is made of plastic, but is not limited thereto.

[0106] The sealing member 160 may be made of an insulating material, for example, a rubber sealing ring, etc., but is not limited thereto.

[0107] In one embodiment, the number of rivets 150 may be increased in the present application to enhance the riveting fixation effect of the pole 140 , further enabling the overall tight assembly of the single cell 100 and eliminating the risk of failure caused by displacement of components in the single cell 100 .

[0108] In the specific embodiment 2 of this application, refer to Figure 8The top cover 131 has a first outer wall 1312 and a second outer wall 1313 disposed opposite each other in the third direction X. The distance between the injection hole 1311 and the first outer wall 1312 is H1 mm, and the distance between the injection hole 1311 and the second outer wall 1313 is H2 mm, satisfying the following relationship: H1 < H2. That is, the distance H1 between the injection hole 1311 and the first outer wall 1312 is less than the distance H2 between the injection hole 1311 and the second outer wall 1313. That is, in the third direction X, the injection hole 1311 is positioned closer to the first outer wall 1312 than to the second outer wall 1313. This ensures that the structural dimensions of the tabs in the electrode assembly 120 can be rationally designed, minimizing any interaction between the tabs and the electrode assembly 120, ensuring the maximum current carrying capacity of the tabs in the battery cell 100, and thus ensuring the safety of the battery cell 100.

[0109] In another embodiment, the distance H1 mm between the injection hole 1311 and the first outer wall 1312 and the distance H2 mm between the injection hole 1311 and the second outer wall 1313 satisfy the following relationship: H1>H2. That is, the distance H1 mm between the injection hole 1311 and the first outer wall 1312 is greater than the distance H2 mm between the injection hole 1311 and the second outer wall 1313. That is, in the third direction X, the injection hole 1311 is positioned closer to the second outer wall 1313 relative to the first outer wall 1312. This ensures that the structural dimensions of the tabs in the electrode assembly 120 can be reasonably designed, reduces the mutual influence between the tabs and the second outer wall 1313, and ensures the maximum current carrying capacity of the tabs in the battery cell 100, thereby ensuring the safety performance of the battery cell 100.

[0110] At the same time, the other technical features in the specific embodiment 2 of the present application are the same as those in the above-mentioned specific embodiment 1. In view of the detailed description of the features in the above-mentioned specific embodiment 1, the specific embodiment 2 in the present application will not be described accordingly, and the specific description can be referred to the description in the specific embodiment 1.

[0111] In the specific embodiment 3 of this application, refer to Figures 9 to 11 There are multiple through holes 1324, and the multiple through holes 1324 are arranged at intervals in the third direction X.

[0112] Specifically, the distance between through-hole 1324 and third outer wall 1314 is H5 mm, and the distance between through-hole 1324 and fourth outer wall 1315 is H6 mm, satisfying the following: H5 > H6. That is, the plurality of through-holes 1324 are positioned relative to the third outer wall 1314 and closer to the fourth outer wall 1315. This further ensures that the structure and dimensions of the tabs in electrode assembly 120 can be rationally designed, minimizing the mutual influence between the tabs and the third outer wall 1314, thereby ensuring the maximum current carrying capacity of the tabs in the single cell 100 and, therefore, the safety performance of the single cell 100.

[0113] At the same time, the other technical features in the specific embodiment three of the present application are the same as those in the above-mentioned specific embodiment one or specific embodiment two. In view of the detailed description of the features in the above-mentioned specific embodiment one or specific embodiment two, the specific embodiment three in the present application will not be described accordingly, and specific reference may be made to the description in specific embodiment one or specific embodiment two.

[0114] In the specific embodiment 4 of this application, refer to Figures 12 to 13 A plurality of through holes 1324 are provided, and the plurality of through holes 1324 are spaced apart in the third direction X, and a portion of the plurality of through holes 1324 is provided close to the fourth outer wall 1315 relative to the third outer wall 1314, and another portion of the plurality of through holes 1324 is provided close to the third outer wall 1314 relative to the fourth outer wall 1315, so as to further ensure that the structural dimensions of the tabs in the electrode assembly 120 can be reasonably designed, reduce the mutual influence between the two, ensure the maximum current flow capacity of the tabs in the single cell 100, and thus ensure the safety performance of the single cell 100, and at the same time ensure that the electrolyte can be evenly injected through the plurality of through holes 1324 during injection, thereby improving the distribution uniformity of the electrolyte in the single cell 100, thereby improving the infiltration efficiency and effect of the electrolyte.

[0115] At the same time, the other technical features in the specific embodiment 4 of the present application are the same as those in the above-mentioned specific embodiment 1 or specific embodiment 2. In view of the detailed description of the features in the above-mentioned specific embodiment 1 or specific embodiment 2, the specific embodiment 4 in the present application will not be described accordingly, and specific reference may be made to the description in specific embodiment 1 or specific embodiment 2.

[0116] On the other hand, in the embodiments of the present application, referring to Figure 14 The present application also provides a battery pack, comprising: a box body 200; a single cell 100 as described in any of the above embodiments, the single cell 100 being arranged in the box body 200; and a box cover 300, the box cover 300 being arranged on one side of the box body 200 in the first direction Z to seal the box body 200.

[0117] The battery pack may comprise three layers: single cells 100, battery modules, and battery packs. Specifically, the single cells 100 are grouped into battery modules, which are then placed in a housing 200 to form a battery pack. Alternatively, the battery pack may comprise two layers: single cells 100 and battery packs. Specifically, the single cells 100 are placed in a housing 200 to form a battery pack. This is not specifically limited in this application and may be configured based on actual circumstances, as long as it does not affect the effectiveness of this application.

[0118] The above steps are merely provided to help understand the method, structure, and core concept of the present application. A person skilled in the art may make several improvements and modifications to the present application without departing from the principles of the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A single battery, characterized in that: include: The housing is provided with a receiving cavity having an open opening; an electrode assembly, disposed in the accommodating cavity; as well as A top cover unit, comprising: a top cover and an insulating member connected to each other, the top cover being arranged on the opening and having a liquid injection hole formed thereon, and the insulating member being arranged on a side of the top cover close to the electrode assembly; Wherein, a through hole is opened on the insulating member, and the through hole is communicated with the accommodating cavity and the liquid injection hole respectively, and the through hole and the liquid injection hole are staggered.

2. The single cell according to claim 1, wherein: The single battery has a first direction and a reference plane perpendicular to the first direction; The injection hole has a first hole wall, and the through hole has a second hole wall. Along the first direction, the orthographic projection of the first hole wall on the reference plane and the orthographic projection of the second hole wall on the reference plane do not overlap with each other.

3. The single cell according to claim 1, wherein: The single battery has a first orientation; The insulating member includes: an insulating body, which is arranged on a side of the top cover close to the electrode assembly; a convex portion, convexly provided on a side of the insulating body close to the electrode assembly, and the convex portion is provided on a side of the liquid injection hole close to the electrode assembly; A groove is formed on a side of the convex portion away from the electrode assembly. The through hole is formed on the convex portion, and the through hole is communicated with the groove, and the groove is communicated with the liquid injection hole.

4. The single cell according to claim 3, wherein: The single battery further has a second direction intersecting with the first direction; The convex portion includes: a first side wall and a second side wall arranged opposite to each other in the second direction, and a third side wall, the third side wall being connected to the first side wall and the second side wall respectively, and the third side wall being arranged on a side of the first side wall away from the liquid injection hole; The through hole is opened in at least one of the first side wall, the second side wall and the third side wall.

5. The single cell according to claim 4, wherein: The single battery further has a third direction intersecting with the first direction and the second direction in pairs; The top cover has a first outer wall and a second outer wall arranged opposite to each other in the third direction; The distance between the injection hole and the first outer wall is H1 mm, and the distance between the injection hole and the second outer wall is H2 mm, satisfying: H1=H2.

6. The single cell according to claim 4, wherein: The single battery further has a third direction intersecting with the first direction and the second direction in pairs; The top cover has a first outer wall and a second outer wall arranged opposite to each other in the third direction; The distance between the injection hole and the first outer wall is H1 mm, and the distance between the injection hole and the second outer wall is H2 mm, satisfying: H1<H2, or H1>H2.

7. The single cell according to any one of claims 5 or 6, characterized in that: The top cover further comprises a third outer wall and a fourth outer wall arranged opposite to each other in the second direction, wherein the third outer wall is arranged relative to the fourth outer wall and close to the first side wall; The distance between the injection hole and the third outer wall is H3 mm, and the distance between the injection hole and the fourth outer wall is H4 mm, satisfying: H3=H4.

8. The single cell according to claim 7, wherein: There are a plurality of through holes, and the plurality of through holes are spaced apart in the third direction; The distance between the through hole and the third outer wall is H5 mm, and the distance between the through hole and the fourth outer wall is H6 mm, satisfying: H5<H6; or, H5>H6.

9. The single cell according to claim 7, wherein: There are multiple through holes, and the multiple through holes are spaced apart in the third direction. Some of the multiple through holes are arranged close to the fourth outer wall relative to the third outer wall, and another part of the multiple through holes are arranged close to the third outer wall relative to the fourth outer wall.

10. A battery pack, characterized in that: include; cabinet; and The single cell according to any one of claims 1 to 9, wherein the single cell is disposed in the box.

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